JPH0643155U - Crushing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To speed up the movement of the hydraulic cylinder during extension to improve work efficiency. [Structure] A pair of crushing arms 2 for crushing an object to be crushed under pressure.
L, 2R and main frame 1 that pivotally supports the crushing arm
And a hydraulic cylinder 5 for operating the crushing arm, and a mounting bracket 6 for mounting the main frame to a boom of a construction vehicle.
In b, from the control valve of the hydraulic system of the construction vehicle, the oil-expansion chamber and the oil-reduction chamber of the hydraulic cylinder are communicated with each other at the time of unloaded expansion,
At the time of crushing the crushed object by the crushing arm and crushing the hydraulic cylinder, and at the time of contracting the hydraulic cylinder, through the logic valve 24 that shuts off the communication between the oil-expanding chamber and the oil-reducing chamber of the hydraulic cylinder, the extension actuating conduit 19 and the contracting actuating pipe, respectively. Connect to the path 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crusher that is attached to a construction vehicle such as a hydraulic power shovel to crush concrete structures.

[0002]

[Prior art]

 A crusher for crushing concrete structures, etc. consists of a pair of crushing arms for pinching and crushing the crushed objects, a main frame for pivotally supporting the crushing arms, and a hydraulic cylinder for activating the crushing arms. , A mounting bracket, which is attached to the boom of the construction vehicle, and as shown in FIG. 6, the extension of the hydraulic cylinder 5 for operating the crushing arm from the control valve 11 of the hydraulic system 9 of the construction vehicle. The expansion chamber 19 and the compression chamber 20 are connected to the oil chamber 5a and the compression chamber 5b, respectively, and pressure oil is supplied from the hydraulic pump 10 to expand and contract the hydraulic cylinder 5 for crushing. The arm is rotated to crush the object to be crushed. The crushing work using such a crusher is often performed in a narrow place or a place with poor scaffolding. Therefore, the crushing arm is small and lightweight, and the crushing force is strong. Things are desired.

However, since the conventional crusher was manufactured with an emphasis on the crushing force, the inside diameter is excessive with respect to the oil amount of the hydraulic system 9 of the construction vehicle to be mounted, and the piston rod 7R has a large diameter. Since the cylinder 5 is used, therefore, the pressure receiving area difference between the oil expansion chamber 5a side and the pressure reduction oil chamber 5b side of the piston 7P is large, and the hydraulic cylinder 5 has a slow movement during extension and is poor in work efficiency. was there.

[0004]

[Problems to be solved by the device]

 The present invention solves such a problem in a crusher, and an object of the present invention is to provide a crusher in which the hydraulic cylinder has a fast movement during extension and has a good work efficiency.

[0005]

The present invention provides a pair of crushing arms for crushing and crushing an object to be crushed, a main frame that pivotally supports the crushing arms, and a hydraulic cylinder for operating the crushing arms. And a mounting bracket for mounting the main frame to the boom of the construction vehicle, the control valve of the hydraulic system of the construction vehicle to the expansion and contraction chambers of the hydraulic cylinder to the hydraulic cylinder. The oil expansion chamber and the oil compression chamber of the hydraulic cylinder are communicated with each other during no-load expansion, and the oil expansion chamber and the oil compression chamber of the hydraulic cylinder are connected when crushing the crushed object by the crushing arm and when crushing the hydraulic cylinder. The above problem is solved by connecting the expansion actuation line and the contraction actuation line via a logic valve that shuts off communication.

The logic valve may be located inside the mounting bracket which is safe against external forces.

[0007]

[Action]

 During no-load expansion of the hydraulic cylinder, pressure oil is supplied to the oil expansion chamber of the hydraulic cylinder from the hydraulic pump of the hydraulic system of the construction vehicle through the control valve and the expansion operation pipeline. At this time, the logic valve communicates the oil-expansion chamber and the oil-reduction chamber of the hydraulic cylinder, so that the hydraulic oil flowing out from the oil-reduction chamber is also supplied to the oil-expansion chamber. Therefore, the hydraulic cylinder rapidly expands, and the crushing arm quickly rotates to a position where the crushed object is pinched.

When the crushing arm crushes the crushed object under pressure, the logic valve shuts off the communication between the oil-expanding chamber and the oil-reducing chamber of the hydraulic cylinder, and the oil-expanding chamber of the hydraulic cylinder contains the hydraulic system of the construction vehicle. Only pressure oil from the control valve is supplied. The hydraulic oil flowing out of the oil pressure reducing chamber returns to the tank from the pressure reducing hydraulic line through the control valve. Since the pressure receiving area of the piston of the hydraulic cylinder on the oil expansion chamber side is large, a large crushing force is applied to the crushing arm.

When the hydraulic cylinder is contracted, the pressure oil is supplied from the control valve of the hydraulic system of the construction vehicle to the contraction oil chamber of the hydraulic cylinder through the contraction operation pipeline. At this time, the logic valve shuts off the communication between the oil-expanding chamber and the oil-reducing chamber of the hydraulic cylinder, so that the hydraulic oil flowing out from the oil-expanding chamber returns to the tank through the control valve from the extending operation line. Since the pressure receiving area of the piston of the hydraulic cylinder on the side of the compression chamber is small, the hydraulic cylinder rapidly contracts and the crushing arm returns to the open position quickly.

[0010]

【Example】

 1 is a front view of a crusher according to an embodiment of the present invention, FIG. 2 is a side view of the crusher, FIG. 3 is an explanatory view of a state in which the crusher presses a crushed object, and FIG. 4 is a view of the crusher. Hydraulic circuit diagram, FIG. 5 is a cross-sectional view showing a configuration of a logic element. Here, a pair of crushing arms 2L, 2R for crushing the crushed object 8 under pressure is rotatably supported by the arm pivot pins 3L, 3R on the main frame 1, and the crushing arm 2L A hydraulic cylinder 5 for actuating the crushing arm is mounted between the upper ends of 2R by cylinder mounting pins 4L, 4R. At the upper end of the main frame 1, a mounting bracket 6 having a mounting hole 30 for replacing the boom (not shown) of the hydraulic power shovel and mounting it is fixed. A logic valve 24 is arranged inside the mounting bracket 6.

When the crusher is mounted on the boom of the hydraulic power shovel, as shown in FIG. 4, from the control valve 11 of the hydraulic system 9 of the hydraulic power shovel to the hydraulic cylinder 5 via the logic valve 24. The oil-expansion chamber 5a and the oil-reduction chamber 5b are connected to an oil-expansion actuation line 19 and a pressure-expansion actuation line 20, respectively. A communication oil passage 21 is provided between the extension actuation pipe 19 and the contraction actuation pipe 20 in the logic valve 24 via the logic element 12, and the pilot port 12P of the logic element 12 has a shuttle port. Pilot oil passages 25 and 26 are connected to the extension operation conduit 19 and the contraction operation conduit 20 via the valve 15. In the middle of the pilot oil passage 25, a sequence valve 13 is provided which connects the shuttle valve 15 and the extension operation pipe 19 when the extension operation pipe 19 is at a high pressure. A check valve 16 for preventing the return of hydraulic oil is provided in the middle of the contraction operation pipe line 20, and a pilot oil passage 28 is connected to the extension operation pipe line 19 in parallel with the check valve 16. A sequence valve 14 is provided which opens the return oil passage 27 when the pressure in the passage 19 is high.

As shown in FIG. 5, the logic element 12 includes a valve body 32 having an inflow port 12I, an outflow port 12O, and a pilot port 12P, and a valve body 32, and this valve body 32 as an inflow port 12I. A spring 33 for urging in a direction of blocking communication between the outflow ports 12O is incorporated. During the crushing work, when the operator switches the control valve 11 of the hydraulic system 9 of the construction vehicle from the N position to the E position, the pressure oil flows from the hydraulic pump 10 through the control valve 11 and the extension working line 19 to the hydraulic cylinder 5 Is supplied to the oil expansion chamber 5a, and the hydraulic cylinder 5 starts to expand. Initially, the crushing arms 2L, 2R are in a no-load state in which the crushed object 8 is not pinched, so the pilot oil passage 25 is shut off by the sequence valve 13 and the return oil passage 27 is shut off by the sequence valve 14. Therefore, the working oil flowing out from the oil compression chamber 5b flows into the inflow port 12I of the logic element 12, moves the valve body 32 against the spring 33, flows out from the outflow port 12O, and is extended in the communication passage 21. It merges with the moving pipe 19 and is supplied to the oil expansion chamber 5 a of the hydraulic cylinder 5. Therefore, the hydraulic cylinder 5 rapidly expands, and the crushing arms 2L, 2R swiftly rotate to a position where the crushed object 8 is pinched.

Then, when the hydraulic cylinder 5 is further extended and the crushing arms 2L, 2R start crushing and crushing the object 8 to be crushed, the load is increased and the pressures in the oil-expanding chamber 5a and the extensible operation conduit 19 are increased. Then, the sequence valve 13 is switched, the pilot oil passage 25 communicates with the pilot port 12P of the logic element 12, and the communication oil passage 21 is shut off. Further, since the sequence valve 14 is also switched and the return oil passage 27 communicates with the tank 22, the hydraulic oil flowing out of the reduced oil chamber 5b returns from the reduced operation pipe passage 20 to the tank 22 via the control valve 11. . Only the high pressure oil from the control valve 11 of the hydraulic system 9 of the construction vehicle is supplied to the oil expansion chamber 5a of the hydraulic cylinder 5. Since the pressure receiving area of the piston 7P of the hydraulic cylinder 5 on the oil expansion chamber 5a side is large, a large crushing force is applied to the crushing arms 2L, 2R.

When the crushed object 8 is crushed, the operator switches the control valve 11 of the hydraulic system 9 of the construction vehicle to the C position. Then, the pressure oil is supplied from the hydraulic pump 10 through the control valve 11, the check valve 16, and the compression actuating pipe 20 to the compression oil chamber 5b of the hydraulic cylinder 5, and the hydraulic cylinder 5 starts reducing. At this time, the pilot oil passage 26 communicates with the pilot port 12P of the logic element 12, and the communication oil passage 21 is shut off, so that the pressure oil does not flow to the extension operation pipeline 19 side. The hydraulic oil that has flowed out of the oil-spreading chamber 5a returns to the tank 22 through the control valve 11 from the stretching operation pipe line 19. Since the extension working line 19 has a low pressure, the sequence valve 13 and the sequence valve 14 are switched to the shutoff side. Since the pressure receiving area of the piston of the hydraulic cylinder on the side of the compression chamber is small, the hydraulic cylinder rapidly contracts and the crushing arms 2L, 2R quickly return to the open position. When the hydraulic cylinder 5 contracts and the crushing arms 2L, 2R return to the open position, the boom is moved and this operation is repeated.

[0015]

[Effect of device]

 As described above, in the crusher of the present invention, a large crushing force is applied to the crushing arm during the crushing work, and the hydraulic cylinder moves quickly even when expanded and contracted, so that the work efficiency is good. The logic valve is located inside the mounting bracket, which is safe against external forces, so it does not break.

[Brief description of drawings]

FIG. 1 is a front view of a crusher according to an embodiment of the present invention.

FIG. 2 is a side view of the crusher.

FIG. 3 is an explanatory diagram of a state in which the crusher presses the crushed object.

FIG. 4 is a hydraulic circuit diagram of the crusher.

FIG. 5 is a cross-sectional view showing a configuration of a logic element.

FIG. 6 is a hydraulic circuit diagram of a conventional crusher.

[Explanation of symbols]

 1 Main Frame 2L Crushing Arm 2R Crushing Arm 5 Hydraulic Cylinder 5a Oil Crushing Room 5b Oil Crushing Room 6 Mounting Bracket 8 Crushed Material 9 Hydraulic System 10 Hydraulic Pump 11 Control Valve 12 Logic Element 13 Sequence Valve 14 Sequence Valve 19 Stretching Operation Line 20 Reduced operation pipe 21 Communication oil passage 24 Logic valve

Claims (2)

[Scope of utility model registration request] 1. Construction of a pair of crushing arms for crushing an object to be crushed under pressure, a main frame for pivotally supporting the crushing arms, a hydraulic cylinder for operating the crushing arms, and the main frame. A crusher equipped with a mounting bracket mounted on a boom of a vehicle, from a control valve of a hydraulic system of the construction vehicle to an oil-expanding chamber and an oil-reducing chamber of the hydraulic cylinder at the time of unloaded expansion of the hydraulic cylinder. A logic valve that connects the oil expansion chamber and the oil compression chamber of the hydraulic cylinder, and shuts off the communication between the oil expansion chamber and the oil compression chamber of the hydraulic cylinder when the crushing arm crushes the object to be crushed and when the hydraulic cylinder is contracted. A crusher characterized in that the extension working line and the contraction working line are respectively connected via the. 2. The crusher according to claim 1, wherein the logic valve is arranged inside the mounting bracket.