JP3327733B2 - Crushing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for adjusting the size of a crushed product of a jaw crusher.

[0002]

2. Description of the Related Art The particle size of a crushed product in a jaw crusher is determined by a gap between a swing jaw and its tooth receiving plate, and the gap is changed by changing a thickness of a shim between a toggle block and a wedge block. Adjusted. Therefore, in order to replace the shim, the toggle block is moved by a hydraulic cylinder (hereinafter, referred to as a moving cylinder), and a shim adjustment configured to fix the toggle block with another hydraulic cylinder (hereinafter, referred to as a fixing cylinder). Equipped with a mechanism.

[0003] When replacing the shim, an operator operates two hydraulic cylinders for moving and fixing as follows. First, the toggle cylinder is unlocked by operating the fixing cylinder, and the toggle block is separated from the wedge block by operating the moving cylinder. This allows the shim to be replaced, removing the previous shim and inserting another shim. After the shim is replaced, the toggle cylinder is pressed against the wedge block by operating the moving cylinder to tighten the shim, and then the fixing block is operated to completely fix the toggle block so as not to move.

[0004]

However, when replacing the shim, it is difficult to operate the two hydraulic cylinders for moving and fixing, and if the wrong operating procedure is performed, the shim is not completely fixed, and the crushing operation is not performed. The toggle block moves inside. That is, if the fixing cylinder is operated before operating the moving cylinder after replacing the shim to eliminate the gap between the toggle block and the shim and the wedge block, the shim may not be completely fixed, Alternatively, the operation may be performed in a direction to loosen the toggle block.

An object of the present invention is to provide a crusher capable of easily and reliably operating the hydraulic cylinder.

[0006]

Means for Solving the Problems A first method for solving the above problems is described below.
In the invention, a jaw-type crusher has a wedge block as a crushed product particle size adjusting mechanism, a shim, a toggle block for pressing the shim against the wedge block, a moving cylinder for moving the toggle block, and a fixing for fixing the toggle block. A crusher having a cylinder for movement, wherein the cylinder for movement is parallel to the toggle block.
And the fixing hydraulic cylinder,
A cylinder perpendicular to the toggle block
Single-acting hydraulic cylinder
A hydraulic control circuit that controls the cylinder and the single-acting hydraulic cylinder; and an electric control circuit that controls the hydraulic control circuit.
Tightening pad connected to the pressure receiving chamber on the shim tightening side of the hydraulic cylinder
Of the pilot valve and the hydraulic cylinder
Pilot type check bar for release connected to pressure receiving chamber on release side
And a set of logic valves including
Cut off the oil passage between the two check valves
Including cut-off solenoid and release solenoid
The switching valve and the receiving pressure on the tightening side of the return hydraulic cylinder
Opening and closing the oil passage between the pressure chamber and the pressure receiving chamber of the single-acting hydraulic cylinder
Fixed solenoid valve and the fixed solenoid valve
Lube and the pressure receiving chamber of the single-acting hydraulic cylinder
And an accumulator for driving the release solenoid.
As a result, pressure oil is supplied to the release side pressure receiving chamber of the return hydraulic cylinder.
The pressure receiving chamber supplied and supplied on the tightening side of the return hydraulic cylinder and
And the pressure receiving chamber of the single-acting hydraulic cylinder is released,
The return-type hydraulic cylinder is driven by the
Pressurized oil is supplied to the tightening-side pressure receiving chamber and the return-type hydraulic
A crusher characterized in that the pressure receiving chamber of the cylinder is released .

According to a second aspect of the present invention, the electric control circuit comprises:
Multiple operation switches, multiple relays, and multiple
Has a sequence logic circuit composed of
The hydraulic control circuit is closed in response to the operation switch.
Solenoid for attachment, solenoid for release and solenoid for fixing
This is a crusher characterized by controlling a valve .

[0008] Further, a third aspect of the present invention is the above-mentioned fixing solenoid.
The valve shuts off the oil passage when it is on and connects the oil passage when it is off.
The tightening switch is used as the operation switch.
Including switches, release switches and fixed switches,
The sequence logic circuit is connected to the release switch.
When the solenoid is turned on, the release solenoid is driven, and the
When the switch is turned on, the tightening solenoid is turned on, and
Then, the release solenoid is turned off, and the fixed switch is turned off.
Switch turns the fixing solenoid valve off.
It is a crusher characterized by being comprised as follows.

According to a fourth aspect of the present invention, there is provided a crusher comprising means for stopping the jaw crusher when the electric control circuit operates.

[0010]

According to the first aspect of the invention, the electric control circuit controls the hydraulic cylinder control circuit to control the moving cylinder and the fixed cylinder during shim adjustment, so that the operation of both cylinders is simple and reliable.

In the first invention , the backward-acting hydraulic cylinder applies a force to the toggle block in parallel with the moving direction to smoothly move the toggle block, and the single-acting hydraulic cylinder moves the toggle block in the moving direction. Hold down orthogonally and smoothly. In addition, one set of logic valve and tightening solenoid
Both cylinders can be controlled with a simple configuration of the solenoid for release, the solenoid for release, and the solenoid valve for fixing .

In the second and third aspects of the present invention , the moving and fixed cylinders are reliably operated by the sequence logic circuit in a predetermined procedure according to the operation switch.

According to the fourth aspect of the present invention, the jaw-type crusher is automatically stopped when the electric control circuit is operated, so that the shim adjusting operation can be performed safely.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a jaw crusher according to the present embodiment. In FIG. 1, a jaw crusher 1 mainly includes a flywheel 2 rotated by a drive motor (not shown), a swing jaw 3 having a rotation center eccentric with respect to the center of the flywheel 2, The swing jaw 3 reciprocates in the left-right direction in FIG. 1 in accordance with the rotation of the flywheel 2. A moving tooth plate 4 is provided on the swing jaw 3.

FIG. 2 shows the operation of the swing jaw 5. As shown in FIGS. 2 (A) and 2 (B), the crushing object 6 is put between the swing jaw 3 and the tooth receiving plate 5 from above the crushing machine. When the swing jaw 3 moves to the left direction 7 as shown in FIG. 2A, the crush target 6 falls downward, and when the swing jaw 3 moves to the right direction 8 as shown in FIG. You. Then, the crushing object 6 further falls downward, is crushed to a size that can pass through the crushing machine outlet 9, and is discharged out of the crushing machine 1.

Therefore, the size of the product after the crushing process, that is, the particle size of the crushed product is determined by the gap at the crusher outlet 9.

The crusher 1 is equipped with a crushed product particle size adjusting mechanism 10 for adjusting the gap. As shown in FIGS. 1 and 3, the crushed product particle size adjusting mechanism 10 includes a toggle block 11, a shim 12, a wedge block 13, a toggle plate 14, a moving cylinder 15, and a fixing cylinder 16. I have. Each of the cylinders 15, 16 is used as a set of two (see FIG. 5).

The toggle block 11 is a wedge block 1.
3 has a slope 17 corresponding to the slope, and is installed so as to be able to approach and separate from the wedge block 13. The toggle block 12 is connected to the swing jaw 3 by a toggle plate 14. The shim 12 is inserted between the wedge block 13 and the slope of the toggle block 11, and is pressed against the wedge block 13 by the toggle block 11.

A return-type hydraulic cylinder is used for the moving cylinder 15, which is disposed at a position parallel to the moving direction of the toggle block 11, and is connected by a link 18. On the other hand, a single-acting hydraulic cylinder is used as the fixing cylinder 16, which is arranged at a position orthogonal to the moving direction of the toggle block 11.

3 (A) to 3 (C) show the operation of the crushed product particle size adjusting mechanism 10 at the time of shim exchange. Prior to sim exchange,
In FIG. 3A, the toggle block 11 is pulled up in the upward direction 19 in the figure by operating the fixing cylinder 16, and at the same time, the toggle block 11 is moved in the left direction 20 in the figure by operating the moving cylinder. As a result, a gap is formed between the toggle block 11 and the wedge block 13, and the shim 12 can be replaced. After the shim is replaced, the toggle block 11 is moved rightward in the drawing 21 by operating the moving cylinder 15 as shown in FIG.
Tighten. Thereafter, as shown in FIG. 3C, the toggle block 11 is moved downward by 2
2 to completely fix the shim 12A by wedge action.

FIG. 4 shows the structure of a self-propelled crusher equipped with the jaw crusher 1 described above. In FIG. 4, the self-propelled crusher includes a jaw crusher 1, a power unit 23 for supplying power to each part of the vehicle, a hopper 24 for charging an object to be crushed, a frame 25, a band traveling device 26, An operation panel 27 for running and working operations, and a belt conveyor 28 for transporting products discharged from the crusher 1 to the front of the vehicle body.
And a magnetic separator 29 for removing the rebar and the like mixed in the product by magnetic force.

Although not shown in FIG. 4, the power unit 23 includes an engine, a pump (see reference numeral 30 in FIG. 5), an engine cooling system, a fuel tank, and a hydraulic oil tank (see reference numeral 31 in FIG. 5). And so on. After the pressure oil sent from the pump is regulated by a pressure control valve (see reference numeral 32 in FIG. 5), the crushing machine 1, the band traveling device 26, the belt conveyor 28, the magnetic separator 2
9 and the like.

FIG. 5 shows a hydraulic control circuit of the crushed product particle size adjuster. In FIG. 5, this hydraulic control circuit includes a moving hydraulic cylinder 15, 15, a fixed single-acting hydraulic cylinder 16, 16, a pump 30, and a hydraulic oil tank 31.
In addition to the pressure control valve 32, a switching valve 33, a logic valve 36, and a fixing solenoid 39
, A pressure switch 40, an accumulator 41, various oil passages 42 to 48, and the like. The switching valve 33 has a release solenoid 34 and a tightening solenoid 35. The logic valve 36 includes two pilot-type check valves 37 and 38.

The flow of pressure oil in the hydraulic control circuit of FIG.
The connection and operation of each unit will be described. The oil sucked from the hydraulic oil tank 31 by the pump 30 is adjusted in oil pressure by a pressure control valve 32, supplied to a switching valve 33 via an oil passage 42, and further supplied to each of the logic valves 36 by oil passages 43 and 44. It is supplied to check valves 37 and 38. The outlet of one check valve 37 of the logic valve 36 is connected to the pressure receiving chamber 15A on the shim tightening side of the movable cylinder 15 for return movement, the solenoid 39 for fixing, and the pressure switch 40 by the oil passage 45. ing.
The outlet of the other check valve 38 is connected to the shim releasing side pressure receiving chamber 15B of the moving cylinder 15 by an oil passage 46. The fixing solenoid 39 is connected to the accumulator 41 and the single-acting fixing cylinder 16 through an oil passage 47. Further, a return port of the switching valve 33 is connected to the hydraulic oil tank 31 by an oil passage 48.

Each solenoid 34 of the switching valve 33,
35 is driven by a signal from an electric control circuit (FIG. 6) described later. When the tightening solenoid 35 is driven, the oil passage 43 communicates with the oil passage 42 to generate hydraulic pressure in the oil passage 43, and the oil passage 44 communicates with the drain oil passage 48, so that there is no oil pressure. When the release solenoid 34 is driven, the oil passage 42 communicates with the oil passage 44 to generate hydraulic pressure in the oil passage 44, and the oil passage 43 communicates with the drain oil passage 48, so that the oil pressure disappears. At a neutral position where both solenoids 34 and 35 are not driven, oil passage 42 is shut off, and oil passage 43 and oil passage 4
4 both communicate with the drain oil passage 48 so that the oil pressure is lost.

In the logic valve 36, when no oil pressure is generated in the oil passages 43, 44 on the inlet sides of the check valves 37, 38, the oil passage 43 and the oil passage 45 are shut off. The road 46 is shut off. And the oil passage 43
Check pressure 38 opens,
The oil passage 44 and the oil passage 46 communicate with each other and communicate with the shim releasing side pressure receiving chamber 15B of the moving cylinder 15. Conversely, when oil pressure is generated in the oil passage 44, another check valve 37 is opened, and the oil passage 43 and the oil passage 45 communicate with each other to move the cylinder 1 for movement.
No. 5 communicates with the shim fastening side pressure receiving chamber 15A.

The fixing solenoid 39 connects or disconnects the oil passage 45 and the oil passage 47 according to a signal from an electric control circuit described later. Here, when the solenoid 39 is driven, both oil passages 45 and 47 are shut off.

FIG. 6 shows an electric control circuit for the hydraulic control circuit described above. In FIG. 6, the electric control circuit 50
Are mainly eight relays 51 to 58, five diodes 61 to 65, four operation switches 71 to 74,
This is a sequence logic circuit including a cylinder hydraulic light 80, a shim adjustment switch 90, and wiring circuits 101 to 114.

Of these circuit elements, relays 51 and 5
Reference numerals 4, 55 and 57 are so-called normally-closed relays which have a switch circuit connected when not energized and which are cut off when energized. The remaining relays 52, 53, 56, and 58 are so-called normally open relays in which the switch circuit is shut off when not energized and the switch circuit is connected when energized.

As shown in FIG. 7, the operation switches 71 to 74 and the cylinder hydraulic lamp 80 are connected to the shim adjustment control panel 7.
Mounted on 0. The control panel 70 is located near the jaw-type crusher 1 for easy operation,
It is arranged at a place different from the operation panel 27 (see FIG. 4). On the right side of the control panel 80 in the figure, switches 71, 73, 74, and 72 are arranged in order from the top so that the operation procedure can be performed without error. The names "Release", "Tightening", "Fixed", and "End" are displayed. Therefore, thereafter, each switch is set to a release switch (71), a tightening switch (73), a fixed switch (74), and an end switch (7).
2). Each of these switches 71 to 74 uses a so-called momentary type switch in which a circuit is connected (turned on) only while the switch is pressed. Further, a cylinder oil pressure lamp 80 is arranged at the upper left of the control panel 80 in the drawing to indicate that the pressure of the oil passage 45 (see FIG. 5) has become equal to or higher than a specified value.

The shim adjusting switch 90 is provided on the operation panel 27 shown in FIG. The reason is for the safety of the system adjustment work. A detailed description of the electric control circuit will be described below.

In FIG. 6, when the shim adjusting switch 90 is turned on, the crusher 1 and the belt conveyor 2 are provided for safety.
8. For example, a solenoid for driving the magnetic separator 29 (not shown)
The power supply circuit 115 to the power supply is turned off, each of these working machines is stopped, and power is supplied from the power supply to the electric control circuit 50, particularly to its wiring circuit 101. When the switch 90 is provided on the operation panel 27, both safety and operability are convenient.

The electric power supplied to the circuit 101 passes through the cylinder hydraulic light 80 and the circuit 102 and is supplied to the normally open switch section of the relay 58. This relay 58 is a pressure switch 4
Powered through 0. Therefore, the oil passage 45 in FIG.
When the pressure is equal to or higher than the specified value, the cylinder oil pressure lamp 80 is turned on to indicate that.

The electric power supplied to the circuit 101 passes through the normally closed switch section of the relay 51 and the circuit 103, the normally open switch sections of the relays 52 and 53, and the release switch 7
1, supplied to each of the end switch 72 and the tightening switch 73.

In order to release the fixation of the shim 12, the release switch 71 is pushed and turned on. When the release switch 71 is turned on, power is supplied to the circuit 104, which activates the relay 54 to cut off the connection between the circuit 106 and the circuit 107. This power is also supplied to the circuit 105 through the diode 61.
This power activates the relay 52, and the circuit 103 and the circuit 108 are connected by turning on the switch. This circuit 108 is connected to the circuit 105 through the normally closed switch section of the relay 57. As a result, a closed circuit is established, and power is continuously supplied from the circuit 103 to the circuit 105 even when the release switch 71 is turned off.

The circuit 105 is connected to the solenoid 34 for releasing the switching valve 33 shown in FIG. 5, so that the oil passage 42 and the oil passage 44 communicate with each other and the logic valve 3
The pressure oil is supplied to the shim releasing side pressure receiving chamber 15B of the moving cylinder 15 through the check valve 38 of No. 6. In this case, since the check valve 37 is opened by the pressure of the oil passage 44 in the logic valve 36, the oil passage 45 is connected to the drain oil passage 4.
8 and fixed cylinder 16 and moving cylinder 15
Is released together with the shim fastening side pressure receiving chamber 15A. As a result, the toggle block 11 moves to the left in the figure as shown in FIG. 3A, and the shim can be replaced.

When the shim is to be fixed after the shim is replaced, the tightening switch 73 is first pressed to turn it on. When the tightening switch 73 is turned on, electric power is supplied to the circuit 109, and this electric power drives the tightening solenoid 35 of the switching valve 33. Further, the same power activates the relay 57 and cuts off between the circuit 105 and the circuit 108 by the switch unit. As a result, the power supply to the relay 52 is cut off, so that the circuit 103 and the circuit 108 are also cut off. Thus, these closed circuits are turned off, that is, opened. Therefore, the release solenoid 34 is turned off. Further, electric power is supplied from the circuit 109 to the circuit 110 through the diode 65, and this electric power turns on (drives) the fixing solenoid 39 through the normally closed switch section of the relay 55 and the circuit 111. At the same time, the power of the circuit 110 activates the relay 53 to connect the circuit 103 and the circuit 106 by the switch portion thereof, and the circuit 106 and the circuit 1 through the switch portion of the relay 54.
07 are connected to each other.
Is supplied with power.

Accordingly, the moving cylinder 15 is operated by turning on the shim tightening solenoid 35 only while the tightening switch 73 is being pressed. Regardless of the ON / OFF state, the fixing solenoid 39 is turned on.

In this case, the oil passage 42 and the oil passage 43 and the drain oil passage 48
And the oil passage 44 are in communication with each other, and pressure oil is applied from the check valve 37 of the logic valve 36 to the shim tightening side pressure receiving chamber 15A of the moving cylinder 15, and conversely, the check valve of the logic valve 36 is 38 is open, the shim release side pressure receiving chamber 15B communicates with the drain oil passage 48. At this time, since the fixing solenoid 39 is operated to shut off the oil passage 45 and the oil passage 47, the fixing cylinder 16
, The hydraulic pressure remains released, and the moving cylinder 15 moves the toggle block 11 rightward in the figure as shown in FIG. 3B, and tightens the shim 12A.

The shim is tightened by the tightening switch 7.
This operation is performed only while the button 3 is pressed, and stops when the switch 73 is released.

When the tightening of the shim 12A is completed, the oil passage 4
Since the oil pressure of 0 rises, the pressure switch 4 installed there
When 0 is detected as the oil pressure equal to or more than the specified value, the cylinder oil pressure lamp 80 on the control panel 70 is turned on when the switch 40 is turned on, and the completion of the tightening is displayed to the operator.

After the fastening is completed, the fixed switch 74 is pressed to turn it on. When the fixed switch 74 is turned on,
Electric power is supplied from the circuit 110 to the circuit 112, and the electric power activates the relay 55 to cut off the electric power supply to the fixing solenoid 39 through the normally closed switch portion. As a result, the fixing solenoid 39 is turned off, and the oil passage 4
7 and the oil passage 45 communicate with each other, and the fixing cylinder 16 is operated to push the toggle block 11 downward in the figure as shown in FIG. 3C, thereby fixing the shim 12A.

At the same time, electric power is supplied from the circuit 112 to the circuit 113 through the diode 63, and this electric power activates the relay 56, and when the switch is turned on, the circuit 1 is turned on.
The connection between 10 and the circuit 114 is connected to the circuit 112 via the diode 64. As a result, the relay 56 is held in the ON state of the switch section, so that the shim tightening solenoid 35 continues to be on through the diode 62 even when the fixed switch 74 is released.

When the shim fixing operation is completed, the cylinder hydraulic lamp 80 is turned on similarly to the tightening operation, to notify the operator of the completion of the operation.

After all operations are completed, the end switch 72 is pressed to turn it on. When the end switch 72 is turned on, the relay 51 is operated. When the switch unit is turned off, the circuit 103 is disconnected from the circuit 101, and returns to the state before the release switch 71 is pressed. In this manner, the shim adjustment operation can be easily performed simply by pressing the switches 71, 73, 74, 72 in order from the top.

The accumulator 41 in FIG. 5 is provided to maintain the pressure of each of the cylinders 15 and 16 after the completion of the adjusting operation.

In the above embodiment, the circuit 50 shown in FIG. 6 has been described as an electric control circuit for the hydraulic control circuit. However, any circuit having the same function may be used. is not. For example, a circuit configured with a sequencer, a microcomputer, or the like can be used as the electric control circuit.

[0049]

As described above, according to the first aspect of the present invention, when the shim is adjusted, the electric control circuit controls the hydraulic control circuit to control the moving cylinder and the fixing cylinder. Is simple and reliable.

According to the first aspect of the present invention , the backward-acting hydraulic cylinder moves the toggle block by applying a force in parallel with the moving direction, and the single-acting hydraulic cylinder moves the toggle block in the moving direction. Pressing at right angles to
The operation is smooth and reliable. In addition, one set of logic valve and solenoid for tightening, solenoid for release and fixing
Since both cylinders are controlled with a simple configuration of the solenoid valve , the hydraulic control circuit can have a simple configuration.

According to the second and third aspects of the present invention, the moving and fixing cylinders are reliably operated by the sequence logic circuit in a predetermined procedure according to the operation switch.

According to the fourth aspect of the present invention, since the jaw-type crusher automatically stops when the electric control circuit is operated, the shim adjusting operation can be performed safely.

[Brief description of the drawings]

FIG. 1 is a view showing the structure of a jaw crusher according to one embodiment of the present invention.

FIG. 2 is a view showing a crushing operation of the jaw crusher of FIG. 1;

FIG. 3 is a diagram showing an operation of a crushed product particle size adjusting mechanism according to one embodiment of the present invention.

FIG. 4 is a diagram showing an example of the structure of a self-propelled crusher using the jaw crusher of FIG.

FIG. 5 is a diagram showing a hydraulic control circuit according to one embodiment of the present invention.

FIG. 6 is a diagram showing an electric control circuit according to one embodiment of the present invention.

FIG. 7 is a diagram showing an example of a control panel in which switches and the like in the electric control circuit of FIG. 6 are arranged.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 jaw type crusher 2 flywheel 3 swing jaw 4 moving tooth plate 5 receiving plate 10 crushed product particle size adjusting mechanism 11 toggle block 12, 12A shim 13 wedge block 14 toggle plate 15 moving cylinder (return hydraulic cylinder) 15A Shim tightening side pressure receiving chamber 15B Shim releasing side pressure receiving chamber 16 Fixing cylinder (single-acting hydraulic cylinder) 23 Power unit 24 Hopper 27 Operation panel 28 Belt conveyor 29 Magnetic separator 30 Pump 31 Hydraulic oil tank 32 Pressure control valve 33 Switching valve 34 Shim tightening solenoid 35 Shim releasing solenoid 36 Logic valve 37, 38 Check valve 39 Fixing solenoid 40 Pressure switch 41 Accumulator 42-48 Oil passage 50 Electric control circuit 51-58 Relay 61-65 Diode 70 Control Panel 71 Release Switch 72 End Switch 73 Tightening Switch 74 Fixed Switch 80 Cylinder Hydraulic Light 90 Shim Adjustment Switch 101-115 Wiring Circuit

Claims (4)

(57) [Claims] 1. A wedge block, a shim, a toggle block for pressing the shim against the wedge block, a moving cylinder for moving the toggle block, and a toggle block fixed to the jaw type crusher as a crushed product particle size adjusting mechanism. In a crusher having a fixing cylinder, the crusher is provided as a moving cylinder with respect to the toggle block.
A backward-acting hydraulic cylinder arranged in a parallel position;
Set the cylinder perpendicular to the toggle block
Single-acting hydraulic cylinder,
A hydraulic control circuit for controlling the pressure cylinder and the single-acting hydraulic cylinder, and an electric control circuit for controlling the hydraulic control circuit.
Pilot check valve for tightening connected to the pressure receiving chamber
Connected to the pressure receiving chamber on the release side of the
One set of logistics including a pilot operated release check valve
And the above two checks of this logic valve
Tightening solenoid for switching oil path between valve and hydraulic source
A switching valve including a release solenoid and a release solenoid;
The pressure receiving chamber on the tightening side of the dynamic hydraulic cylinder and the single-acting hydraulic
Solenoid valve for opening and closing the oil passage between the pressure receiving chambers of the cylinder
, The fixed solenoid valve and the single-acting hydraulic
With an accumulator connected between the pressure receiving chambers of the cylinder
The release solenoid is driven by driving the release solenoid.
Pressure oil is supplied to the pressure receiving chamber on the release side of the cylinder, and
The pressure receiving chamber on the tightening side of the hydraulic cylinder and the single-acting hydraulic
The pressure receiving chamber of the cylinder is released, and the tightening solenoid is driven.
As a result, pressure oil is supplied to the pressure-receiving chamber on the tightening side of the return hydraulic cylinder.
Supplied and the release-side pressure receiving chamber of the return hydraulic cylinder is
Crusher characterized by being configured to be released . 2. The hydraulic control circuit according to claim 1, wherein the electric control circuit includes a sequence logic circuit including a plurality of operation switches, a plurality of relays, and a plurality of diodes. Tightening solenoid, solution
The crusher according to claim 1 , wherein the crusher controls a release solenoid and a fixed solenoid valve . 3. The fixed solenoid valve is turned on.
To shut off the oil path and turn off to connect the oil path.
When, Tightening switches, release switches and
And a fixed switch; and The sequence logic circuit turns on the release switch
Drives the solenoid for release, and tightens the switch.
The fastening solenoid is turned on by turning on the switch, and
Turn off the release solenoid and release the fixed switch.
Turn on the fixed solenoid valve by turning on.
3. The method according to claim 2, wherein
Crushing machine. 4. The crusher according to claim 1, further comprising means for stopping the jaw crusher when the electric control circuit operates.