Abstrict The objective of this invention is to provide a method to adjust
the position of a jaw crusher toggle block, and a device used for
said method; wherein the said device can adjust the cavity width
over a wide range, and can be applied to a wide range of jaw crushers,
including large models, without itself having to be enlarged. This
invention is a novel method to adjust the position of the toggle
block of a jaw crusher in which the toggle block supports one end
of a toggle plate that is connected at the other end to the bottom
of the swinging jaw; with said method using a device comprised of
a displacement block that is positioned on the back face of the
toggle block and moves in the same lateral direction as the toggle
block, and a pair of hydraulic cylinders, connected to the toggle
block at the two ends that lie perpendicular to its lateral direction
of motion in a manner such that the cylinders expand or contract
in the said lateral direction of motion of the toggle block; wherein
the said displacement block is moved forward to displace the toggle
block towards the toggle plate, and the said hydraulic cylinders
are contracted to further pull forward the toggle block, and seams
are inserted into the gap that forms between the back face of the
toggle block and the front face of the displacement block.
Claims We claim:
1. A toggle block sliding device for a jaw crusher having a toggle
block supporting one end of a toggle plate that is connected at
the other end to a bottom of a swinging jaw; said device comprising
a displacement block positioned on a back face of the toggle block
and moveable in a same lateral direction as the toggle block, said
displacement block including a planar face opposite the back face
of said toggle block and a tapered segment formed of sloped faces
on a side of said displacement block opposite said planar face,
at least one wedge engaging said tapered segment and moveable in
a direction parallel to said planar face, and means for moving said
at least one wedge in said parallel direction.
2. A toggle block sliding device as claimed in claim 1 further
including a pair of hydraulic cylinders connected to the toggle
block at lateral sides of the toggle block perpendicular to a direction
of motion of the toggle block, said cylinders being expandable and
contractible in the direction of motion of the toggle block, a plurality
of shims placeable between said displacement block and said back
face of the toggle block, and a system for expanding and contracting
said pair of hydraulic cylinders to both take up part of a load
on said toggle block during operation of the jaw crusher and to
move said toggle block to permit insertion and removal of at least
one of said shims.
3. A jaw crusher toggle block sliding device as claimed in claim
2 wherein said system for expanding and contracting said pair of
hydraulic cylinders includes relief valves set in a hydraulic fluid
circuit for said hydraulic cylinders, said relief valves being adjusted
such that the hydraulic cylinders will bear a specified percentage
of the load required to move the said toggle block, with the balance
of the load being borne by said displacement block.
4. A toggle block sliding device for a jaw crusher having a toggle
block supporting one end of a toggle plate that is connected at
the other end to a bottom of a swinging jaw; said device comprising
a displacement block positioned on a back face of the toggle block
and moveable in a same lateral direction as the toggle block, said
displacement block including a planar face opposite the back face
of said toggle block and a pyramid segment formed of two sloped
faces meeting at an apex on a side of said displacement block opposite
said planar face, two wedges engaging said pyramid segment and moveable
in a direction parallel to said planar face, and means for moving
said two wedges in synchronism in said parallel direction.
5. A toggle block sliding device as claimed in claim 4 further
including a facing block mounted on the jaw crusher having a shape
the same as said pyramid segment and having an apex facing said
apex of said pyramid segment, said two wedges engaging both said
facing block and said pyramid segment of said displacement block.
6. A toggle block sliding device as claimed in claim 5 wherein
said means for moving said two wedges in synchronism in said parallel
direction comprises a screw rod engaged with said two wedges and
an drive driving the screw rod moving the two wedges toward or away
from each other which in turn moves the displacement block relative
to the facing block.
7. A toggle block sliding device as claimed in claim 6 further
including at least one spring connected to the displacement block
and biasing said displacement block closer to the facing block.
8. A toggle block sliding device as claimed in claim 5 further
including at least one spring connected to the displacement block
and biasing said displacement block closer to the facing block.
9. A toggle block sliding device as claimed in claim 5 further
including a pair of hydraulic cylinders connected to the toggle
block at lateral sides of the toggle block perpendicular to a direction
of motion of the toggle block, said cylinders being expandable and
contractible in the direction of motion of the toggle block, a plurality
of shims placeable between said displacement block and said back
face of the toggle block, and a system for expanding and contracting
said pair of hydraulic cylinders to both take up part of a load
on said toggle block during operation of the jaw crusher and to
move said toggle block to permit insertion and removal of at least
one of said shims.
10. A jaw crusher toggle block sliding device as claimed in claim
9 wherein said system for expanding and contracting said pair of
hydraulic cylinders includes relief valves set in a hydraulic fluid
circuit for said hydraulic cylinders, said relief valves being adjusted
such that the hydraulic cylinders will bear a specified percentage
of the load required to move the said toggle block, with the balance
of the load being borne by said displacement block.
11. A toggle block sliding device as claimed in claim 4 further
including a pair of hydraulic cylinders connected to the toggle
block at lateral sides of the toggle block perpendicular to a direction
of motion of the toggle block, said cylinders being expandable and
contractible in the direction of motion of the toggle block, a plurality
of shims placeable between said displacement block and said back
face of the toggle block, and a system for expanding and contracting
said pair of hydraulic cylinders to both take up part of a load
on said toggle block during operation of the jaw crusher and to
move said toggle block to permit insertion and removal of at least
one of said shims.
12. A jaw crusher toggle block sliding device as claimed in claim
11 wherein said system for expanding and contracting said pair
of hydraulic cylinders includes relief valves set in a hydraulic
fluid circuit for said hydraulic cylinders, said relief valves being
adjusted such that the hydraulic cylinders will bear a specified
percentage of the load required to move the said toggle block, with
the balance of the load being borne by said displacement block.
13. A jaw crusher toggle block sliding device having a toggle block
supporting one end of a toggle plate that is connected at the other
end to a bottom of a swinging jaw; said device comprising a displacement
block positioned on a back face of the toggle block and moveable
in a same lateral direction as the toggle block, said displacement
block including a planar face opposite the back face of said toggle
block and a pyramid segment formed of two sloped faces meeting at
an apex on a side of said displacement block opposite said planar
face, two wedges engaging said pyramid segment and moveable in a
direction parallel to said planar face, means for moving said two
wedges in synchronism in said parallel direction, said means for
moving said two wedges in synchronism in said parallel direction
comprising a screw rod engaged with said two wedges and an drive
driving the screw rod moving the two wedges toward or away from
each other which in turn moves the displacement block relative to
the facing block, a facing block mounted on the jaw crusher having
a shape the same as said pyramid segment and having an apex facing
said apex of said pyramid segment, said two wedges engaging both
said facing block and said pyramid segment of said displacement
block, at least one spring connected to the displacement block and
biasing said displacement block closer to the facing block, a pair
of hydraulic cylinders connected to the toggle block at lateral
sides of the toggle block perpendicular to a direction of motion
of the toggle block, said cylinders being expandable and contractible
in the direction of motion of the toggle block, a plurality of shims
placeable between said displacement block and said back face of
the toggle block, and a system for expanding and contracting said
pair of hydraulic cylinders to both take up part of a load on said
toggle block during operation of the jaw crusher and to move said
toggle block to permit insertion and removal of at least one of
said shims, said system for expanding and contracting said pair
of hydraulic cylinders includes relief valves set in a hydraulic
fluid circuit for said hydraulic cylinders, said relief valves being
adjusted such that the hydraulic cylinders will bear a specified
percentage of the load required to move the said toggle block, with
the balance of the load being borne by said displacement block.
Description BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to a method to adjust the position of the
toggle block in a double toggle or single toggle jaw crusher, and
a toggle block sliding device used therein.
2. Description of Prior Art
A jaw crusher is a typical crushing machine that can be used for
the primary breaking of rocks as excavated. An example of a double
toggle jaw crusher is shown in FIG. 3. Excavated rocks are scooped
into the crushing cavity 12 formed between the fixed jaw 1 and the
swinging jaw 11 and are broken by the impelling force of the swinging
jaw.
The swinging jaw 11 is suspended from the swinging jaw shaft 13
as the fulcrum, and swings with the movement of the pitman 21 moving
up and down with the rotation of the eccentric shaft 2 and the
toggle mechanism on either side of pitman. In this case, a double
toggle mechanism is formed from the jaw toggle plate 22 that connects
the swinging jaw 11 and pitman 21 and the frame toggle plate 24
that connects the pitman 21 and toggle block 23.
A safety device to guard against uncrushable objects, and an adjustment
device to adjust the gap between the fixed jaw 1 and swinging jaw
11 thereby controlling the degree of crushing, are set on the frame
toggle plate side. This cavity width adjustment device slides the
toggle block 23 back and forth by the movement of a wedge 25 and
by means of the frame toggle plate 24 pitman 21 and jaw toggle
plate 22 adjusts the forward and backward position of the swinging
jaw 11.
A single jaw crusher has no pitman 21 nor jaw toggle plate 22
and the eccentric shaft 2 serves a dual function as the swinging
jaw shaft 13.
DETAILED EXPLANATION OF INVENTION
Objective of this invention
The objective of this invention is to provide a method to adjust
the position of a jaw crusher toggle block, and a device used for
that method; wherein the device can adjust the cavity width over
a wide range, and can be applied to a wide range of jaw crushers,
including large models, without itself having to be enlarged.
Problems to be resolved by this invention
As described, conventionally a wedge 25 is pushed in to slide the
toggle block 23 but this configuration restricts the range of adjustment,
and is difficult to apply to a large jaw crusher. To obtain a wider
adjustment range, the dimensions of the sliding mechanism, including
the wedge, would have to be enlarged, necessitating an enlargement
of the entire jaw crusher configuration.
Means to resolve these problems
This invention is a novel method to adjust the position of the
toggle block of a jaw crusher in which the toggle block supports
one end of a toggle plate that is connected at the other end to
the bottom of the swinging jaw; with said method using a device
comprised of a displacement block that is positioned on the back
face of the toggle block and moves in the same lateral direction
as the toggle block, and a pair of hydraulic cylinders, connected
to the toggle block at the two ends that lie perpendicular to its
lateral direction of motion in a manner such that the cylinders
expand or contract in the said lateral direction of motion of the
toggle block; wherein the said displacement block is moved forward
to displace the toggle block towards the toggle plate, and the hydraulic
cylinders are contracted to further pull forward the toggle block,
and seams are inserted into the gap that forms between the back
face of the toggle block and the front face of the displacement
block.
Further, this invention is a novel jaw crusher toggle block sliding
device used as the device to adjust the position of the toggle block,
in which the sliding device supports one end of a toggle plate that
is connected at the other end to the bottom of the swinging jaw;
wherein said device is comprised of a displacement block that is
positioned on the back face of the toggle block and moves in the
same lateral direction as the toggle block, and a pair of hydraulic
cylinders, connected to the toggle block at the two ends that lie
perpendicular to its lateral direction of motion in a manner such
that the cylinders expand or contract in the said lateral direction
of motion of the toggle block; wherein the said displacement block
is moved forward to displace the toggle block, and the hydraulic
cylinders are contracted or expanded to enable the toggle block
to slide forward or backward.
In the jaw crusher toggle block sliding device, the said displacement
block is comprised of a planar face that contacts the back face
of the toggle block, and a tapered segment formed from sloped faces
on the reverse side of the planar face, wherein a wedge interlocking
with the said tapered segment is moved in a direction perpendicular
to the lateral movement of the toggle block, thereby causing the
displacement block to move forward or backward.
Also, in the jaw crusher toggle block sliding device, the displacement
block is comprised of a planar face that contacts the back face
of the toggle block, and a pyramid segment formed from two sloped
faces on the reverse side of the planar face, wherein two wedges
interlocking with each sloped face are moved towards each other
or apart from each other, in a direction perpendicular to the lateral
movement of the toggle block, thereby causing the displacement block
to move forward or backward.
Moreover, in the jaw crusher toggle block sliding device, relief
valves are set in the hydraulic fluid circuit of the hydraulic cylinders,
wherein the relief valves are adjusted such that the hydraulic cylinders
will bear a specified percentage of the load required to move the
toggle block, and the balance of the load is borne by the displacement
block.
Effectiveness of this invention
Given the configuration and action as described above, this invention
is effective because once the displacement block reaches its limiting
position, the hydraulic cylinders are contracted to further pull
the toggle block forward, wherein a gap is formed between the planar
face of said displacement block and the back face of the toggle
block, into which a suitable number of seams are inserted. This
configuration enables the position of the toggle block to be adjusted
over a wide range without having to enlarge the dimensions of the
adjustment device, and can even be applied to large jaw crushers.
SIMPLIFIED EXPLANATION OF DIAGRAMS
FIG. 1 is a schematic explanatory diagram of one embodiment of
the device of this invention.
FIG. 2 is an explanatory diagram of the entire configuration of
one embodiment of the device of this invention.
FIG. 3 is an explanatory diagram of the conventional technique.
EXAMPLE
An example of one embodiment of this invention is explained below,
with reference to the diagrams. This explanation is for a double
toggle jaw crusher, but the invention can also be applied to a single
toggle jaw crusher.
Configuration of toggle block sliding device
As shown in FIG. 2 the toggle block 3 is sandwiched between the
upper support member 15 and lower support member 16 arranged like
shelves and joined to the main machine frame 14. One end of the
frame toggle plate 24 is connected to this toggle block 3. During
normal crushing operation, this toggle block remains fixed in position.
The frame toggle plate 24 pitman 21 jaw toggle plate 22 swinging
jaw 11 and fixed jaw 1 are of conventional configuration, and hence
an explanation is omitted here.
The cavity width adjustment device is set inside the housing 17
joined to the frame 14 on the back side of the toggle block 3. This
housing 17 is open on that side facing the toggle block 3 and houses
the displacement block 4a, facing block 4b, two wedges 5a, 5b, and
screw rod 6.
As shown in FIG. 1 the displacement block 4a abuts against the
back face of toggle block 3 and is comprised of a planar face 41
and two sloped sides 42 42 on the opposite face that form a pyramid.
Springs 43 43 are mounted on either end of displacement block 4a,
each energized in the direction of facing block 4b. This facing
block 4b is comprised of two sloped sides 42 42 to form a mirror
image of, and set at a specified distance from, the pyramid segment
of the displacement block 4a.
Wedges 5a, 5b are positioned between the displacement block 4a
and facing block 4b with each wedge being of a shape formed by the
two opposing sloped sides 42 42 thereof. A trapezoidal screw 51
51 is mounted in the center of each wedge 5a, 5b, and a screw rod
6 is screwed through the central axis formed by the trapezoidal
screws 51 51 and wedges 5a, 5b. One end of said screw rod 6 is
connected to a rotating drive motor 61.
One end of two hydraulic cylinders 7a, 7b is connected to each
end of the toggle block 3 that is perpendicular to its lateral movement,
wherein the hydraulic cylinders expand and contract in the direction
of the lateral movement of the toggle block 3.
An example of the hydraulic fluid circuit 8a, 8b of hydraulic cylinder
7a is shown in FIG. 1. Relief valves 81a, 81b, and a switching valve
82 are set in the circuits, check valve 83 is set between the hydraulic
cylinder 7a of hydraulic circuit 8a and relief valve 81a; and a
hydraulic pump 85 is set on the hydraulic tank 84 side of hydraulic
fluid circuit 8b.
Hydraulic fluid circuits 8c, 8d of the other hydraulic cylinder
7b are connected to hydraulic fluid circuits 8a, 8b respectively
between the hydraulic cylinder 7a and relief valves 81a, 81b. The
relief valves 81a, 81b can be adjusted such that hydraulic cylinders
7a, 7b will bear a specified percentage of the load required to
move the toggle block 3. In this case, the displacement block 4a
can bear the remaining load, thus reducing wear of the motor 61
that rotates the screw rod 6.
Method to adjust position of toggle block
As the liners of the fixed jaw 1 and swinging jaw 11 wear out,
the cavity width becomes too wide, in which case, the toggle block
3 can be moved forward to narrow the gap. In this case, the motor
61 is started to rotate the screw rod 6 to drive the wedges 5a,
5b closer together, thereby causing the displacement block 4a to
advance and displace the toggle block 3 forward; at the same time
hydraulic cylinders 7a, 7b are contracted, and the two actions together
cause the toggle block 3 to advance.
When the displacement block 4a reaches its limiting position, the
hydraulic cylinders 7a, 7b are contracted further to advance the
toggle block 3 to the required position.
This action causes a gap to form between the planar face 41 of
the displacement block 4a and the back face of the toggle block
3 for which a suitable number of seams 9 are inserted. Accordingly,
the impelling force transmitted to the toggle block 3 during crushing
can be transferred to the back side of the toggle block.
To reverse the toggle block 3 the screw rod 6 is rotated in the
reverse direction to drive the wedges 5a, 5b apart, and the displacement
block 4a is pulled back with the compressive force of the return
springs 43 43; at the same time the hydraulic cylinders 7a, 7b
are expanded to push back the toggle block 3 and the two actions
together cause the toggle block 3 to reverse.
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