Abstrict There is provided a jaw crusher capable of providing a toggle plate
holder mechanism without increasing the overall height thereof.
A tension link mechanism (70) as the toggle plate holder mechanism
includes a link having a tension link (71), tension lever (72),
tension rod (73), and tension spring (74). Therefore, the layout
angle of the tension link (71) and tension rod (73) can be changed
freely by the tension lever (72). The freedom of layout in the height
direction can thus be improved. As a result, without increasing
the overall height, the toggle plate holder mechanism can be provided
for the jaw crusher 30 having a reaction force receiver link mechanism
60 of an up-thrust type.
Claims What is claimed is:
1. A jaw crusher comprising: a fixed jaw; a swing jaw which swings
relative to the fixed jaw; a reaction force receiver mechanism of
an up-thrust type including a toggle plate having an end contacting
the swing jaw, and a toggle plate support member which another end
of the toggle plate contacts; and a toggle plate holder mechanism
which holds the toggle plate between the swing jaw and the reaction
force receiver mechanism, wherein the toggle plate holder mechanism
is comprised of a link.
2. The jaw crusher according to claim 1 wherein the reaction force
receiver mechanism has an outlet clearance adjustment mechanism
which moves the swing jaw near to and away from the fixed jaw through
the toggle plate support member and the toggle plate, and the toggle
plate holder mechanism has a biasing portion, which biases the swing
jaw and the toggle plate support member to the toggle plate and
is attached to the toggle plate support member.
3. The jaw crusher according to claim 1 wherein the toggle plate
holder mechanism includes a tension link having an end attached
to the swing jaw, a tension lever supporting another end of the
tension link, a tension rod having an end attached to the tension
lever, and a tension spring which biases the tension rod in an axial
direction of the tension rod, and swing centers at two sides of
the tension link are positioned near swing centers at two sides
of the toggle plate.
4. The jaw crusher according to claim 2 wherein the toggle plate
holder mechanism includes a tension link having an end attached
to the swing jaw, a tension lever supporting another end of the
tension link, a tension rod having an end attached to the tension
lever, and a tension spring which biases the tension rod in an axial
direction of the tension rod, and swing centers at two sides of
the tension link are positioned near swing centers at two sides
of the toggle plate.
5. The jaw crusher according to claim 1 wherein the toggle plate
holder mechanism includes a tension link having an end attached
to the swing jaw, a tension lever supporting another end of the
tension link, a tension rod having an end attached to the tension
lever, and a tension spring which biases the tension rod in an axial
direction of the tension rod, and swing centers at two sides of
the tension link are located at the same positions as swing centers
at two sides of the toggle plate, when viewed in profile.
6. The jaw crusher according to claim 2 wherein the toggle plate
holder mechanism includes a tension link having an end attached
to the swing jaw, a tension lever supporting another end of the
tension link, a tension rod having an end attached to the tension
lever, and a tension spring which biases the tension rod in an axial
direction of the tension rod, and swing centers at two sides of
the tension link are located at the same positions as swing centers
at two sides of the toggle plate, when viewed in profile.
7. The jaw crusher according to claim 3 wherein the tension link
has a shape having a concave, and a notch is formed, in the toggle
plate, at respective positions corresponding to the swing centers
at two sides of the tension link.
8. The jaw crusher according to claim 4 wherein the tension link
has a shape having a concave, and a notch is formed, in the toggle
plate, at respective positions corresponding to the swing centers
at two sides of the tension link.
9. The jaw crusher according to claim 5 wherein the tension link
has a shape having a concave, and a notch is formed, in the toggle
plate, at respective positions corresponding to the swing centers
at two sides of the tension link.
10. The jaw crusher according to claim 6 wherein the tension link
has a shape having a concave, and a notch is formed, in the toggle
plate, at respective positions corresponding to the swing centers
at two sides of the tension link.
11. The jaw crusher according to claim 3 wherein the toggle plate
is divided into plural pieces, at a position where the tension link
is provided.
12. The jaw crusher according to claim 4 wherein the toggle plate
is divided into plural pieces, at a position where the tension link
is provided.
13. The jaw crusher according to claim 5 wherein the toggle plate
is divided into plural pieces, at a position where the tension link
is provided.
14. The jaw crusher according to claim 6 wherein the toggle plate
is divided into plural pieces, at a position where the tension link
is provided.
15. A self-propelled crushing machine on which the jaw crusher
according to claim 1 is mounted.
Description BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a jaw crusher which moves
a jaw near to and away from the other jaw to crush raw materials
and a self-propelled crushing machine having the same.
[0003] 2. Description of Related Art
[0004] There is a known conventional jaw crusher which moves a
swing jaw near to and away from a fixed jaw to crush raw materials
(for example, refer to published Japanese Patent No. 3133766 pages
5 to 8 FIGS. 1 and 2).
[0005] In this jaw crusher, the lower side of the swing jaw is
supported by a reaction force receiver mechanism including a toggle
plate and a toggle block. A most widely used type of reaction force
receiver mechanism is a down-thrust type in which the toggle plate
contacts the back of the swing jaw obliquely from upside toward
downside. According to this down-thrust type, the swing jaw swings
upward from downside when the swing jaw moves near to the fixed
jaw.
[0006] If a reaction force receiver mechanism having a toggle plate
is used, the toggle plate is merely clamped between the toggle block
and the swing jaw. This kind of jaw crusher therefore is provided
with a toggle plate holder mechanism, which prevents release of
the swing jaw from its engagement with the toggle plate while the
swing jaw is swinging. The toggle plate holder mechanism has a tension
rod whose one end is set on the swing jaw. The tension rod is positioned
along the toggle plate. The other end of the tension rod is biased
by a tension spring. The biasing force of the tension spring biases
the swing jaw to the toggle block side, to clamp the toggle plate.
[0007] In the reaction force receiver mechanism of the down-thrust
type, the swing jaw moves upward from downside near to the fixed
jaw, pressing the fixed jaw. At this time, however, the angle at
which the swing jaw moves near to the fixed jaw is so small that
raw materials slip on the fixed jaw. This results in a problem that
the fixed jaw is worn out in a short time. Hence, another reaction
force receiver mechanism of a so-called up-thrust type is known,
in which the swing jaw moves near to the fixed jaw when the swing
jaw swings downward from upside. In a jaw crusher having this reaction
force receiver mechanism, the angle at which the swing jaw moves
near to the fixed jaw is so large that raw materials hardly slip
between the jaws. Accordingly, the lifetime of the jaws can be extended.
[0008] However, in this up-thrust type, the toggle plate contacts
the swing jaw obliquely upward from downside due to the structure
of the reaction force receiver mechanism. Therefore, if the tension
rod and tension spring are positioned along the toggle plate in
the above-described manner, ends of the rod and spring protrude
into a discharge space below the jaw crusher. This results in a
problem that the ends of the tension rod and tension spring interfere
with crushed materials being discharged by a discharge conveyer
or the like.
[0009] In order to prevent the end of the tension rod from protruding
in the discharge space, the overall height of the jaw crusher has
to be increased. However, in the case that the jaw crusher is mounted
on the self-propelled crushing machine, the height thereof can not
be increased unlimitedly due to a height limit for transportation
purpose.
SUMMARY OF THE INVENTION
[0010] The present invention has as an object to provide a jaw
crusher of an up-thrust type in which a toggle plate holder mechanism
can be installed without increasing the overall height, and a self-propelled
crushing machine having the jaw crusher.
[0011] A jaw crusher according to the present invention has: a
fixed jaw; a swing jaw which swings relative to the fixed jaw; a
reaction force receiver mechanism of an up-thrust type including
a toggle plate having an end contacting the swing jaw, and a toggle
plate support member which another end of the toggle plate contacts;
and a toggle plate holder mechanism which holds the toggle plate
between the swing jaw and the reaction force receiver mechanism,
in which the toggle plate holder mechanism includes a link.
[0012] In the jaw crusher constructed in the structure as described
above, the toggle plate holder mechanism includes a link, and the
structure can be arranged by changing freely the orientation of
the link. Accordingly, the freedom of layout of the toggle plate
holder mechanism in its height direction is enhanced. As a result,
even when a reaction force receiver mechanism of an up-thrust type
is adopted, for example, ends of the tension rod and tension spring
constituting a biasing portion do not protrude into a discharge
space from the frame, so crushed materials can be discharged without
problems. In addition, the toggle plate holder mechanism can therefore
be installed without changing the overall height. This is advantageous
especially for a vehicle-mounted (self-propelled) jaw crusher whose
height is restricted.
[0013] Desirably in the jaw crusher according to the present invention,
the reaction force receiver mechanism has an outlet clearance adjustment
mechanism which moves the swing jaw near to and away from the fixed
jaw through the toggle plate support member and the toggle plate,
and the toggle plate holder mechanism has a biasing portion, which
biases the swing jaw and the toggle plate support member to the
toggle plate and is attached to the toggle plate support member.
[0014] In the jaw crusher constructed in the structure as described
above, the outlet clearance between the fixed and swing jaws is
adjusted as the swing jaw is moved near to or away from the fixed
jaw through the toggle plate support member and the toggle plate,
by the outlet clearance adjustment mechanism. As a result, the size
of crushed materials can be adjusted so that applicability of the
jaw crusher is enhanced.
[0015] At this time, the biasing portion of the toggle plate holder
mechanism is attached to the toggle plate support member. Therefore,
as the toggle plate support member is moved by the outlet clearance
adjustment mechanism, the biasing portion of the toggle plate holder
mechanism moves accordingly. As a result, the bias applied from
the biasing portion to the toggle plate is not changed substantially
but is kept substantially constant regardless of the size of the
outlet clearance. It is hence unnecessary to adjust the bias when
the outlet clearance is adjusted. The operation of adjusting the
outlet clearance is simplified.
[0016] Desirably in the jaw crusher according to the present invention,
the toggle plate holder mechanism includes a tension link having
an end attached to the swing jaw, a tension lever supporting another
end of the tension link, a tension rod having an end attached to
the tension lever, and a tension spring which biases the tension
rod in an axial direction of the tension rod, and swing centers
at both sides of the tension link are positioned near swing centers
at both sides of the toggle plate.
[0017] In the jaw crusher constructed in the structure as described
above, the tension link swings in accordance with the toggle plate
when the swing jaw swings. At this time, the swing centers at both
sides of the tension link are provided near the swing centers at
both sides of the toggle plate. Therefore, the swing of the tension
link is approximate to the swing of the toggle plate. That is, the
tension link swings about the vicinity of the swing center on the
side of the tension lever, and the position of the link lever does
not change substantially. Accordingly, the bias of the tension spring
does not change substantially, and hence, the bias is stable while
the swing jaw swings.
[0018] Desirably in the jaw crusher according to the present invention,
the toggle plate holder mechanism includes a tension link having
an end attached to the swing jaw, a tension lever supporting another
end of the tension link, a tension rod having an end attached to
the tension lever, and a tension spring which biases the tension
rod in an axial direction of the tension rod, and swing centers
at both sides of the tension link are located at the same positions
as swing centers at both sides of the toggle plate, when viewed
in profile.
[0019] In the jaw crusher constructed in the structure as described
above, the swing centers at both sides of the tension link are located
at the same positions as the swing centers at both sides of the
toggle plate, when viewed in profile. Therefore, the toggle plate
and the tension link are always kept parallel to each other. While
the swing jaw is swinging, the swing of the toggle plate and the
swing of the tension link correspond to each other. That is, the
tension link swings about the swing center of the toggle plate on
the side of the tension lever, so that the position of the tension
lever does not change at all. Accordingly, the bias of the tension
spring does not change but the bias is constant while the swing
jaw is swinging. As a result, the crushing operation can be performed
more stably.
[0020] Desirably in the jaw crusher according to the present invention,
the tension link has a shape having a concave, and a notch is formed,
in the toggle plate, at respective positions corresponding to the
swing centers at both sides of the tension link.
[0021] Conventionally, the toggle plate is provided throughout
the overall width of the swing jaw. Therefore, interference with
the toggle plate may be caused if the swing centers at both sides
of the tension link are located near the swing centers of the toggle
plate or at the same positions as the swing centers of the toggle
plate, when viewed in profile. In contrast, in the jaw crasher according
to the present invention, the tension link is formed in a shape
having a concave, and a notch is formed, in the toggle plate, at
respective positions corresponding to the swing centers at both
sides of the tension link. Therefore, the tension link and the toggle
plate do not interfere with each other, but the swing centers of
the tension link can be steadily located, with an easy structure,
near the swing centers of the toggle plate or at the same positions
as the swing centers of the toggle plate, when viewed in profile.
[0022] Desirably in the jaw crusher according to the present invention,
the toggle plate is divided into plural pieces, at a position where
the tension link is provided.
[0023] Also in the jaw crusher constructed in this structure, the
toggle plate is divided at the position where the tension link is
provided. Therefore, the swing centers of the tension link do not
interfere with the toggle plate but can be steadily located near
the swing centers of the toggle plate or at the same positions as
the swing centers of the toggle plate, when viewed in profile.
[0024] A self-propelled crushing machine according to the present
invention is characterized in that the above-described jaw crusher
according to the present invention is mounted on the machine.
[0025] On the self-propelled crushing machine constructed in the
structure as described above, the jaw crusher as described above
is mounted. Therefore, the effects described above can be attained,
and the toggle plate holder mechanism is installed without increasing
the overall height. This kind of jaw crusher is hence suitably mounted
on, especially, a self-propelled crushing machine whose height is
limited during transportation. Further, the overall height can be
kept short, so that loading ability is improved and reductions in
size and weight are promoted.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 is a front view showing a self-propelled crushing
machine according to an embodiment of the present invention;
[0027] FIG. 2 is a rear view showing the self-propelled crushing
machine;
[0028] FIG. 3 is a right side view showing the self-propelled crushing
machine;
[0029] FIG. 4 is a left side view showing the self-propelled crushing
machine;
[0030] FIG. 5 is a plan view showing the self-propelled crushing
machine;
[0031] FIG. 6 is a sectional view showing a jaw crusher of the
self-propelled crushing machine;
[0032] FIG. 7 is an enlarged sectional view showing a toggle plate
holder mechanism of the jaw crusher;
[0033] FIG. 8 is a plane sectional view showing a toggle plate
holder mechanism of the jaw crusher;
[0034] FIG. 9 is an enlarged sectional view showing a modified
toggle plate holder mechanism;
[0035] FIG. 10 is a plane sectional view showing the toggle plate
holder mechanism of FIG. 9;
[0036] FIG. 11 is an enlarged sectional view showing another modified
toggle plate holder mechanism;
[0037] FIG. 12 is a plane sectional view showing the toggle plate
holder mechanism of FIG. 11;
[0038] FIG. 13 is an enlarged sectional view showing a further
modified toggle plate holder mechanism; and
[0039] FIG. 14 is a plane sectional view showing the toggle plate
holder mechanism of FIG. 13.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
[0040] Hereinafter, an embodiment of the present invention will
be described on the basis of the drawings.
[0041] [Schematic Description of Whole Structure]
[0042] FIGS. 1 to 5 are respectively a front view, rear view, right
side view, left side view, and plan view of a self-propelled crushing
machine according to a present embodiment. In the present embodiment,
the right side in FIG. 3 is referred to as the front side of the
structure, as well as the left side as the rear side, for the sake
of conveniences in explanation.
[0043] A self-propelled crushing machine 1 may be used to crush
concrete lumps and asphalt lumps at a building demolition site or
the like. In case of the present embodiment, however, the machine
is used exclusively to crush coarsely big rocks and fieldstones
into predetermined grain sizes at a mine, quarry, or the like. Therefore,
the machine in this embodiment is large in each of overall length,
width, and height, and classified into a large-scale self-propelled
crushing machine.
[0044] This self-propelled crushing machine 1 includes a main unit
10 having a pair of lower traveling members 11 a feed unit 20 mounted
in the rear of the main unit 10 and supplied with raw materials,
a jaw crusher 30 mounted in the front of the feed unit 20 a power
unit 40 further mounted in the front of the jaw crusher 30 and
a discharge conveyor 50 extending obliquely upward in a frontward
direction from between a pair of crawlers 18 below the main unit
10.
[0045] The main unit 10 has a main frame (track frame) 14 consisting
of left and right side frames 12 each continuous in the longitudinal
direction and plural link frames 13 (FIG. 2) linking the side frames
to each other. The lower traveling members 11 are respectively assembled
on the lower sides of the side frames 12. Each lower traveling member
is constructed in a structure in which a crawler 18 is wound around
a front sprocket 16 driven by a hydraulic motor 15 and a rear idler
17.
[0046] The feed unit 20 has a rear frame 23 in which left and right
side frames 21 protruding rearward are linked to each other by a
substantially rectangular link frame 22 having an opening 22A. A
grizzly feeder 24 is set above the rear frame 23 with plural coil
springs inserted therebetween. The grizzly feeder 24 is driven by
a vibrator 25. A hopper 26 is provided above the grizzly feeder
24 covering the feeder from its three sides. Raw materials are
thrown into the hopper 26 whose opening widens upward. Provided
below the grizzly feeder 24 is a discharge chute 27 which guides
raw materials sorted and dropped by a grizzly to the discharge conveyor
50 below. In the hopper 26 of the present embodiment, the left and
right wings 28 are provided to be foldable relative to the main
body, and can be folded downward by releasing the upper end of the
support bars 29. Consequently, the overall height of the feed unit
20 becomes short, restriction of the transportation by a trailer
can be satisfied.
[0047] As shown in FIG. 6 the jaw crusher 30 has a crusher frame
34 in which left and right side wall plates 31 are linked to each
other by a rear wall plate 32 and a cross member 33. The rear wall
plate 32 is reinforced by plural ribs. A fixed jaw 35 is attached
to the inside of the rear wall plate 32. A swing jaw 36 whose tooth
surface stands substantially vertically is provided in the front
of the fixed jaw 35. The swing jaw 36 hangs, in its upper side,
on an eccentric part of a main shaft 37 which is rotatably bridged
between the side wall plates 31. The swing jaw 36 is also supported,
in its lower side, by a reaction force receive link mechanism (reaction
force receiver mechanism) 60 which receives reaction force generated
by crushing. Further, a tension link mechanism (toggle plate holder
mechanism) 70 constantly biases the swing jaw 36 to the reaction
force receive link mechanism 60.
[0048] The reaction force receive link mechanism 60 substantially
includes a toggle plate 61 having an end engaged on a rear part
of the swing jaw 36 toggle links (toggle plate support members)
64 which support the other end of the toggle plate 61 and rotate
about the link pin 63 as a rotation center thereof, and bear lock
cylinders 65 having lower ends pivoted on the toggle links 64. Each
bear lock cylinder 65 is rotatably pivoted on the side of the cross
member 33 (trunnion structure). Further, the rod 66 of each bear
lock cylinder 65 is extended and retracted so that an outlet clearance
W between the lower ends of the jaws 35 and 36 can be adjusted.
That is, the reaction force receive link mechanism 60 serves as
an outlet clearance adjustment link mechanism (outlet clearance
adjustment mechanism) 62 which moves the swing jaw 36 near to and
away from the fixed jaw 35 through the toggle links 64 and the toggle
plate 61 by driving the bear lock cylinders 65.
[0049] The tension link mechanism 70 is positioned at the substantial
center of the reaction force receive link mechanism 60. The mechanism
70 substantially includes a tension link 71 having an end pivoted
on the side of the swing jaw 36 a tension lever 72 rotatably pivoted
on a fixed link pin 63 a tension rod 73 having an end pivoted on
the tension lever 72 and a tension spring (biasing portion) 74
which biases the tension rod 73 in a predetermined direction. The
tension rod 73 and the tension spring 74 are assembled on the toggle
links 64.
[0050] In the jaw crusher 30 as described above, a pulley 38 provided
at an end of a main shaft 37 is driven by a hydraulic motor 39 through
a V-belt. With the rotation of the main shaft 37 the swing jaw
36 functions as a swinging link and crushes raw materials between
the swing jaw 36 and the fixed jaw 35. At this time, in the jaw
crusher 30 according to the present embodiment, the reaction force
receive link mechanism 60 adopts the up-thrust type, so that the
swing jaw 36 swings downward from upside as if the tooth surface
of the fixed jaw 35 is scraped.
[0051] The power unit 40 has a base frame 42 in which left and
right side frames 41 are linked to each other by plural link frames
(not shown). An engine, hydraulic pump, fuel tank 43 operating
oil tank 44 and the like are mounted on the base frame 42 with
use of appropriate mount brackets and cross members. A control valve
is contained in a container space surrounded by base frame 42. The
control valve distributes the hydraulic pressure of the hydraulic
pump to the hydraulic motor for the lower traveling members 11
a vibrator 25 of the grizzly feeder 24 the hydraulic motor 39 of
the jaw crusher 30 a hydraulic motor for driving the discharge
conveyor 50 and the like.
[0052] A rear part of the discharge conveyor 50 is positioned in
the rear of the discharge port at the lower end of the discharge
chute 27. The discharge conveyor 50 discharges frontward uncrushed
raw materials discharged from the chute 27 and crushed materials
dropped from the outlet of the jaw crusher 30 to drop and accumulate
those materials from a height. If foreign materials such as rebar,
metal strips, and the like are contained in raw materials, a magnetic
ore separator may be mounted in the front of the discharge conveyor
50 to remove those foreign materials. In place of accumulating crushed
materials from the discharge conveyor 50 on the ground, crushed
materials may be conveyed to a remote place by secondary and tertiary
conveyors or the like.
[0053] [Details of Jaw Crusher]
[0054] Details of the jaw crusher 30 will now be described.
[0055] In FIG. 6 the jaw crusher 30 has the fixed jaw 35 fixed
to the rear wall plate 32 and the swing jaw 36 which swings relative
to the fixed jaw 35 as described above. Provided on the rear surface
of the swing jaw 36 are the reaction force receive link mechanism
60 which receives reaction force from the swing jaw 36 and the
tension link mechanism 70 which biases the swing jaw 36 with a predetermined
bias toward the reaction force receive link mechanism 60.
[0056] The reaction force receive link mechanism 60 includes a
link having the toggle plate 61 toggle links 64 and bear lock
cylinders 65 as described above.
[0057] As shown in FIGS. 7 and 8 the toggle plate 61 is a plate-like
member which contacts the rear surface of the swing jaw 36 throughout
the overall width of the jaw 36. The toggle plate 61 contacts the
swing jaw 36 in an oblique upward direction from downside, so that
the reaction force receive link mechanism 60 is of the up-thrust
type. An end of the toggle plate 61 contacts a contact portion 361
provided on the rear surface of the swing jaw 36. The other end
of the toggle plate 61 contacts contact portions 641 provided on
the toggle links 64. Thus, the toggle plate 61 is sandwiched between
the swing jaw 36 and the toggle links 64. Concave portions 362 and
642 each having a substantially arc-like section with a radius R
indicated by an arrow in FIG. 7 are formed on the contact portions
361 and 641. The toggle plate 61 can swing about swinging centers
S2 which are the centers of the arcs of the concave portions 362
and 642. In the width-directional center of the toggle plate 61
a notch 611 is formed on the side close to the toggle links 64.
[0058] Two toggle links 64 are provided inside and near the side
wall plates 31 and are linked to each other by a link portion 643
integrally bridged between the toggle links 64. A mount portion
644 to which the tension spring 74 is attached is integrally formed
on the link portion 643. These toggle links 64 are each pivoted
on a fixed link pin 63. Two fixed link pins 63 are provided coaxially
with each other inside the side wall plates 31. First ends of these
pins, which are far from each other, are fixed to the side wall
plates 31. Second ends of the pins, which are close to each other,
are fixed to a mount plate 331 protruding downward from the cross
member 33.
[0059] The toggle links 64 are respectively provided with the contact
portions 641 described above. End portions of the toggle plate 61
on both sides of the notch 611 contact the contact portions 641
respectively.
[0060] The bear lock cylinders 65 are respectively provided in
the front of the two toggle links 64. As shown in FIG. 6 each bear
lock cylinder 65 has the rod 66 and a cylinder body 67 for extending
and retracting the rod 66. Each bear lock cylinder 65 is arranged
to stand with the rod 66 situated in the lower side of the cylinder
body 67. The lower ends of the rods 66 are respectively pivoted
on the front ends of the toggle links 64. A portion of each cylinder
body 67 near the end thereof through which the rod 66 extends and
retracts, i.e., the lower side (head side) of the cylinder body
is rotatably supported by a support portion 68 of the trunnion structure.
This support portion 68 has a support shaft 681 integrally formed
on and protruding from both sides of the cylinder body 67 and a
bearing portion not shown but supporting rotatably the support shaft
681. An end of the support shaft 681 is pivoted on one of the side
wall plates 31. The other end of the support shaft 681 is pivoted
on the mount plate 332 protruded from the cross member 33. Thus,
the bear lock cylinders 65 are positioned near the side wall plates
31.
[0061] In each of these bear lock cylinders 65 the rod 66 or the
piston at an end of the rod 66 interference-fits the cylinder body
67 and both of the rod and the cylinder body 67 are usually locked.
If hydraulic pressure is applied to the interference-fitting portions
through the rods 66 the circumferential walls of the cylinder bodies
67 expand, reducing resistance between the cylinder bodies 67 and
the rods 66. The lock is then released so that the rods 66 can extend
and retract relative to the cylinder bodies 67. Therefore, the rods
66 can be locked at arbitrary positions in the cylinder bodies 67.
[0062] According to this reaction force receive link mechanism
60 the reaction force generated when raw materials are crushed
is received by the fixed link pin 63 of the toggle links 64 and
the support portions 68 of bear lock cylinders 65 through the toggle
plate 61. If, as described above, hydraulic pressure is applied
between the pistons of the bear lock cylinders 65 and the cylinder
bodies 67 to release the lock and if the rods 66 are extended and
retracted, the swing jaw 36 is moved near to and away from the fixed
jaw 35 by the toggle links 64 and the toggle plate 61. That is,
the reaction force receive link mechanism 60 also functions as the
outlet clearance adjustment link mechanism 62.
[0063] The tension link mechanism 70 is provided at the substantial
center in the width direction of the swing jaw, between two toggle
links 64 as shown in FIGS. 7 and 8. The tension link mechanism 70
is a link mechanism having the tension link 71 tension lever 72
tension rod 73 and tension spring 74 as described above.
[0064] The tension link 71 is substantially L-shaped. An end of
the tension link 71 is pivoted on a rotation center shaft 711 of
a mount portion 363 provided on the swing jaw 36. The other end
of the tension link 71 is pivoted on a rotation center axis 712
of the tension lever 72. The tension link 71 can therefore swing
about the substantial centers of the rotation center shafts 711
and 712 as swing centers S1. That end of the tension link 71 which
is close to the tension lever 72 is positioned inside the notch
611 of the toggle plate 61 so that the tension link might not interfere
with the toggle plate 61.
[0065] The swing centers S1 are arranged near the swing centers
S2 of the toggle plate 61 so that the swing of the tension link
71 is approximate to the swing of the toggle plate 61.
[0066] The tension lever 72 has a shaft portion 721 rotatably supported
by the fixed link pins 63 and lever portions 722 which rotate about
the shaft portion 721. The shaft portion 721 is formed in a cylindrical
shape having two ends supported between those ends of the fixed
link pins 63 that are close to each other. A pair of lever portions
722 are provided vertically below the shaft portion 721. The tension
link 71 is set on a rear lower end of the lever portion 722 and
an end of the tension rod 73 is set on a front lower end of the
lever portion 722.
[0067] The tension rod 73 penetrates the mount portion 644 of the
toggle links 64 and is arranged in an obliquely upward direction
to the front side from the mount portion of the tension lever 72.
The tension rod 73 is inserted in the tension spring 74. The tension
spring 74 has a top end contacting a contact portion 731 screwed
on the tension rod. The bottom end of the tension spring is made
contact a contact portion 732 fixed to the mount portion 644. Thus,
the tension spring 74 biases the tension rod 73 to the toggle links
64 with a predetermined bias (tension). Specifically, the tension
spring 74 biases the swing jaw 36 to the toggle links 64 through
the tension rod 73 tension lever 72 and tension link 71. This
biasing steadily holds the toggle plate 61 between the swing jaw
36 and the toggle links 64.
[0068] [Operation of Jaw Crusher]
[0069] Hereinafter, the operation of the jaw crusher 30 will be
explained.
[0070] At first, the hydraulic motor 39 is driven to rotate the
pulley 38 through the V-belt and further the main shaft 37. The
swing jaw 36 pivoted on the eccentric part of the main shaft 37
then swings. At this time, the toggle plate 61 swings about the
swing center S2 at the side of the toggle links 64 because the swing
jaw 36 is supported at its lower side by the reaction force receive
link mechanism 60 of the up-thrust type. Accordingly, the swing
jaw 36 swings to move near to and away from the fixed jaw. By this
swinging action, the swing jaw 36 and the fixed jaw 35 crush raw
materials thrown between both jaws, and discharge crushed materials
to the discharge conveyor 50 from the outlet clearance W between
the lower ends.
[0071] Further, the reaction force generated when the swing jaw
36 crushes raw materials is received by the fixed link pin 63 of
the toggle links 64 and the support portions 68 of the bear lock
cylinders 65. If the reaction force received by the swing jaw 36
is too large, the interference-fitting portions of the bear lock
cylinders 65 slide to prevent damages on the toggle links 64 and
the bear lock cylinders 65.
[0072] Meanwhile, to change the grain size of crushed materials,
the outlet clearance adjustment link mechanism 62 is operated. Hydraulic
pressure is applied between the pistons of the bear lock cylinders
65 and the cylinder bodies 67 so that the cylinder bodies 67 are
slightly expanded to reduce resistance between them. The lock depending
on the interference-fit is thus released. In this state, hydraulic
pressure is applied to the side of the heads of the cylinder bodies
67 or to the side of the bottoms, to extend and retract the rods
66. Accordingly, the toggle links 64 rotate about the fixed link
pin 63. The toggle plate 61 then moves so that the swing jaw 36
moves near to or away from the fixed jaw 35. The outlet clearance
W between the lower ends of the swing jaw 36 and the fixed jaw 35
is thus adjusted to change the grain size of the crushed materials.
[0073] At this time, in the tension link mechanism 70 the tension
link 71 moves and the tension lever 72 rotates, as the swing jaw
36 moves near to and away from the fixed jaw 35. Also at this time,
the swing centers S1 of the tension link 71 are respectively near
the swing centers S2 of the toggle plate 61. The rotation centers
of the tension lever 72 and the toggle links 64 are the common fixed
link pin 63. Therefore, the trajectory of the tension link 71 is
approximate to the trajectory of the toggle plate 61. The tension
lever 72 accordingly rotates by an angle substantially equal to
the rotation angle of the toggle links 64. As a result, the contact
portion 731 of the tension rod 73 attached to the tension lever
72 and the contact portion 732 fixed to the mount portion 644 of
the toggle links 64 does not substantially change their positions
relative to each other. The bias of the tension spring 74 is kept
substantially constant even when the outlet clearance W is changed.
[0074] [Advantages of the Embodiment]
[0075] The following advantages are obtained from the above embodiment.
[0076] (1) The tension link mechanism 70 constitutes a link having
the tension link 71 tension lever 72 tension rod 73 and tension
spring 74. Therefore, the layout angles of the tension link 71 and
the tension rod 73 at the tension lever 72 can be changed so that
the freedom of layout in the height direction can be enhanced. Accordingly,
the tension rod 73 can be positioned obliquely upward in a frontward
direction. Therefore, the tension rod 73 and the tension spring
74 do not protrude toward the discharge conveyor 50 below the swing
jaw 36 and crushed materials can be discharged excellently.
[0077] On the contrary, even in the jaw crusher including the reaction
force receive link mechanism 60 of the up-thrust type, the tension
link mechanism 70 can be positioned without increasing the overall
height. Hence, the height limit is surely satisfied even when the
jaw crusher 30 is mounted on a self-propelled crushing machine 1.
[0078] (2) The tension spring 74 is held between the top end of
the tension rod 73 and the mount portion 644 of the toggle links
64 by the contact portions 731 and 732. As a result, the toggle
links 64 rotate and the swing jaw 36 moves, to adjust the outlet
clearance. The contact portion 732 then also moves. At this time,
the tension rod 73 moves together through the tension link 71 and
the tension lever 72 so that the bias of the tension spring 74
is not substantially changed. Accordingly, it is unnecessary to
reset the bias of the tension spring 74 when the outlet clearance
is adjusted. The outlet clearance adjustment can be achieved simply
in a short time.
[0079] (3) When the swing jaw 36 swings, the toggle plate 61 swings
about the swing center S2 at the side of the toggle links 64. At
this time, the swing centers S1 of the tension link 71 are positioned
near the swing centers S2 at both sides of the toggle plate 61
the swings of the toggle plate 61 and the tension link 71 are approximate
to each other. That is, the tension link 71 swings about the swing
center S1 on the side of the tension lever 72 as the center of the
swing, and the position of the tension lever 72 is not changed substantially.
Accordingly, the tension spring 74 does not substantially expand
or contract, but stable bias can be attained.
[0080] Note that the present invention is not limited to the embodiment
described above but includes modifications and changes as far as
the objects of the invention are achieved.
[0081] For example, the swing centers S1 of the tension link 71
are positioned near the swing centers S2 at both sides of the toggle
plate 61. The present invention is not limited hitherto. As shown
in FIGS. 9 and 10 the swing centers S1 may be at the same positions
as the swing centers S2 at both sides of the toggle plate 61 when
viewed in profile. In FIGS. 9 and 10 the tension link 71 is formed
linearly in the longitudinal direction and is positioned in the
substantial center in the width direction of the swing jaw 36. The
toggle plate 61 is divided at the substantial center where the tension
link 71 is positioned into two pieces each of which is sandwiched
between the contact portions 361 and 641.
[0082] According to this structure, the swing centers S1 of the
tension link 71 can be arranged at the same positions as the swing
centers S2 of the toggle plate 61 when viewed in profile. Therefore,
when the swing jaw 36 swings, the tension link 71 behaves in the
same manner as the swing of the toggle plate 61. Accordingly, when
the swing jaw 36 swings, the tension link 71 swings about the swing
center S1 on the side of the tension lever 72 but the tension lever
does not rotate at all. Therefore, the bias of the tension spring
74 does not change at all, so that more stable bias can be attained.
[0083] Note that the toggle plate 61 need not be divided limitedly
into two pieces but may be divided into a number of pieces corresponding
to the number of provided tension link mechanisms 70.
[0084] Alternatively, as shown in FIGS. 11 and 12 notches 611
may be provided respectively at the both sides of the toggle plate
61 and the both ends of the tension link 71 may be positioned inside
these notches 611. In FIGS. 11 and 12 notches 611 are formed on
both ends of the toggle plate 61 at the substantial center of the
toggle plate 61 in its width direction. Both ends of the tension
link 71 which has a shape having a concave when viewed in profile,
are positioned inside these notches 611. At an end of the tension
link 71 the swing center S1 on the side of the swing jaw 36 is
at the same position as the swing center S2 of the toggle plate
61 when viewed in profile. The other swing center S1 on the side
of the tension lever 72 is positioned near a swing center S2 of
the toggle plate 61 when viewed in profile. According to this structure,
the swing centers S1 can be located near the swing centers S2 of
the toggle plate 61 or at the same positions as the swing centers
S2 when viewed in profile, without causing interference between
both ends of the tension link 71 and the toggle plate 61. Thus,
the bias of the tension spring 74 can be stabled. Also according
to this structure, the notches 611 are formed in the toggle plate
61 so that the swing jaw 36 can be supported by the one single
toggle plate 61 throughout the overall width of the jaw 36. Therefore,
one-sided abrasion of the toggle plate 61 can be prevented from
occurring even from a long-time use. The durability of the toggle
plate 61 can thus be improved.
[0085] In the structure shown in FIGS. 9 and 10 the positions
of the swing centers S1 may both be near the swing centers S2 of
the toggle plate 61 or only one of the swing centers S1 may be
located near one of the swing centers S2. Also in FIGS. 11 and 12
both of the swing centers S1 may be near the swing centers S2 or
may be at the same positions as the swing centers S2 when viewed
in profile. Alternatively, on the contrary to these figures, the
swing centers S1 may be located near the swing centers S2 or at
the same positions as the swing centers S2 when viewed in profile.
[0086] The tension link mechanism 70 is provided in the substantial
center of the swing jaw 36 in its width direction. However, as shown
in FIGS. 13 and 14 a pair of tension link mechanisms may be provided
on both sides of the toggle plate 61. In FIGS. 13 and 14 the toggle
links 64 are provided close to each other, and are linked to each
other by a cylindrical link portion 643. The toggle links 64 are
fixed to a rotation link pin 69. Therefore, the rotation link pin
69 rotates together with toggle links 64. The rotation link pin
69 is rotatably supported by mount portions 333 each of which has
a substantially center portion protruding below the cross member
33.
[0087] The tension levers 72 are supported individually rotatably
by the rotation link pin 69. The tension rod 73 is supported by
a mount portion 644 protruded from the toggle links 64 through a
tension spring 74.
[0088] The bear lock cylinders 65 are rotatably supported by the
mount portions 334 protruded upward from the cross member 33 on
the far side of the cylinder bodies 67 from the rods 66 i.e., on
the bottom side of the cylinder bodies 67.
[0089] In the jaw crusher having this structure, the tension link
mechanism 70 includes links. Therefore, the tension rod 73 and the
tension spring 74 do not protrude to the side of the discharge conveyor
50 but excellent discharging performance can be achieved. When the
rods 66 of the bear lock cylinders 65 are extended and retracted,
the toggle links 64 rotate together with the rotation link 69 so
that the outlet clearance W between the swing jaw 36 and the fixed
jaw 35 can be adjusted like the foregoing embodiment. At this time,
since the tension spring 74 is attached to the toggle links 64
the bias does not substantially change even if the outlet clearance
is adjusted. It is hence unnecessary to adjust the bias, and the
outlet clearance adjustment can be achieved easily.
[0090] The jaw crusher 30 according to the present invention has
been described to be mounted on the self-propelled crushing machine
1. However, the present invention is not limited hitherto but the
jaw crusher 30 may be used as a permanently fixed type. Also in
this case, the tension rod 73 and the tension spring 74 can be structured
so as not to interfere with the discharge conveyor 50 without increasing
the overall height. Excellent discharging performance can hence
be achieved.
[0091] [Other Embodiments]
[0092] The best structures and methods to practice the present
invention have been disclosed in the description above. The present
invention however is not limited to the description. Although the
present invention has been illustrated and described mainly based
on a specific embodiment, a skilled person in the art will be able
to variously modify the embodiment described above with respect
to shapes, materials, quantities, and any other structures of components
constituting the present invention, without deviating from the scope
of the technical ideas and objects of the invention.
[0093] Therefore, those parts of the above description that disclose
shapes, materials, and the like are merely examples which help understanding
of the present invention and do not limit the scope of the present
invention. The present invention includes such description that
uses names excluding part or all of limitations to those shapes,
materials, and the like.
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