JP3191987B2 - Opening and closing operation device of crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing a crusher mounted on a tip of a work attachment of a construction machine such as a hydraulic shovel or a work vehicle.

[0002]

2. Description of the Related Art FIG. 6 is a side view of an essential part of a hydraulic excavator equipped with a crusher 1 for breaking up a concrete lump or the like in a building. In the figure, 2 is a work attachment of a hydraulic shovel, 3 is a fixed jaw of the crusher 1, 4 is a movable jaw, 5
Is a crushing blade provided on the movable jaw body 4, and 6 is a crushing hydraulic cylinder (hereinafter referred to as a crushing cylinder). FIG. 7 is a main part hydraulic circuit diagram showing a conventional opening / closing operation device of the crusher 1. In the figure, 7 is a pilot switching valve for controlling the crushing cylinder 6, 8L and 8R are pilot pressure receiving portions on the left and right of the pilot switching valve 7, 9 and 10 are relief valves, 11
Is a main pump, 12 is an oil tank, 13 is a hydraulic remote control valve, 14 and 15 are pilot valves of the hydraulic remote control valve 13, 16 is a pedal (including not only a pedal but also a manual operation lever), and 17 is a pilot pressure. Pilot pumps 18L and 18R, which are hydraulic pressure sources, are left and right pilot pipelines that communicate the pilot pressure receiving portions 8L and 8R with the pilot valves 14 and 15, respectively.

In a hydraulic shovel having a conventional opening and closing operation device shown in FIG. 7, when a pedal 16 is depressed forward or backward, the pilot valve 14 or 15 is operated.
The pilot pressure from the pilot pump 17 is
9, pilot valve 14 or 15, pilot line 18L
Or 18R through the pilot pressure receiving portion 8L or 8R
Act on. The pilot switching valve 7 switches to the a position or the b position. The main pressure oil from the main pump 11 is supplied to the rod-side oil chamber C or the bottom-side oil chamber D of the crushing cylinder 6 via the pipe line 20 and the a position or the B position of the pilot switching valve 7. Thus, the crushing cylinder 6 can be extended and contracted, so that the movable jaw 4 can be opened and closed with respect to the fixed jaw 3, and the small crushing operation of the crusher 1 can be performed.

[0004]

When a hydraulic excavator equipped with a crusher at the end of a work attachment performs a small work such as a concrete lump, an operation for opening and closing a movable jaw of the crusher is usually performed by a driver. It is performed by pedal operation. In the pedal operation, the step of changing the toe and the heel of the foot in the front-rear direction is repeatedly performed continuously and many times. The foot-operated pilot valve operation has a large operating force and a large operation stroke, so the foot is tired early,
The driver was in pain. An object of the present invention is to solve the above problems.

[0005]

SUMMARY OF THE INVENTION In a crusher in which a crusher is attached to the tip of a work attachment of a construction machine and a crusher hydraulic cylinder inside the crusher is operated to expand and contract, a pilot for controlling the crusher cylinder is provided. The left and right pilot pressure receiving portions of the switching valve and the pilot pressure hydraulic pressure source are communicated via an electromagnetic switching valve, and a switch for opening and closing the crusher is provided between a solenoid of the electromagnetic switching valve and a power source, and the switch is By performing a direction switching operation of the pilot switching valve by a switch operation, a reduction operation and an extension operation of the hydraulic cylinder for crushing can be respectively operated, and the operation cylinder is disposed on an operation lever for operating the work attachment.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a main part circuit diagram showing an opening / closing operation device 21 according to a first embodiment of the present invention. In the figure, the same reference numerals are given to components using the same components as the conventional technology.
Reference numeral 22 denotes a 3-position electromagnetic switching valve, 23L and 23R denote left and right solenoids of the electromagnetic switching valve 22, 24L and 24R denote left and right switches connected to the solenoids 23L and 23R, respectively, and 25 denotes a power supply. FIG.
FIG. 4 is a cross-sectional view showing a state where L and 24R are provided on a grip 27 of an operation lever 26. In the figure, reference numeral 28 denotes a double-push operation unit which operates in a seesaw manner, and 29 denotes a fulcrum pin.

Next, a first embodiment of the opening / closing device 2 of the present invention will be described.
1 will be described with reference to FIGS. In the opening / closing operation device 21, the left and right pilot pressure receiving portions 8 L and 8 R of the pilot switching valve 7 for controlling the crushing cylinder 6 communicate with the pilot pump 17 via the electromagnetic switching valve 22. The switches 24L and 24R are provided between the solenoids 23L and 23R and the power supply 25, respectively, and the direction of the pilot switching valve 7 is switched by operating the switches (24L and 24R).

Next, the operation of the opening / closing operation device 21 will be described. When the opening / closing operation is not performed, the switch 24
Both L and 24R are off. Here, in order to start the small crushing operation, the switch 24L is first turned on. When the solenoid 23L is energized, the electromagnetic switching valve 2
2 switches from the neutral position to the E position. The pilot pressure from the pilot pump 17 is supplied to the line 19 ′ and the electromagnetic switching valve 2.
It acts on the pilot pressure receiving portion 8L through the position E in FIG. Since the pilot switching valve 7 is switched to the position A and the crushing cylinder 6 is contracted, the crusher 1 is opened. The switch 24R is turned on by adding a concrete mass or the like to the crusher 1. (At this time, switch 24
L is turned off. ) The solenoid 23R is energized, and the electromagnetic switching valve 22 switches to the F position. Pilot pump 1
The pilot pressure from 7 is supplied to the line 19 ', the electromagnetic switching valve 22
And acts on the pilot pressure receiving portion 8R through the conduit 18'R. Since the pilot switching valve 7 is switched to the position B and the crushing cylinder 6 is extended, the crushing machine 1 performs the closing operation to perform the small division of the concrete block or the like. Since the switches 24L and 24R have a small operation force of the fingers and a small operation stroke, the driver can continuously open and close without fatigue.

Next, FIG. 3 is a partial cross-sectional side view of the push-on switch 30. This push-on switch 30
Then, the button portion 31 is pushed by the stroke S to be turned on. Therefore, when the switch operation is desired to be performed with the foot, two push-on switches 30 are provided in parallel, and the switches 24L and 24 of the circuit shown in FIG.
It may be arranged in place of R.

FIG. 4 is a main part circuit diagram showing an opening / closing operation device 32 according to a second embodiment of the present invention. In the figure, the same reference numerals are given to those using the same components as the opening / closing operation device 21 of the first embodiment. 33 is a double-push changeover switch having an off position. In the opening / closing operation device 32 of the second embodiment, the direction switching control of the three-position electromagnetic switching valve 22 is performed by one double push switch 33.
The operation and function of the opening and closing operation device 32 of the second embodiment are the same as those of the opening and closing operation device 21 of the first embodiment.

FIG. 5 is a main part circuit diagram showing an opening / closing operation device 34 according to a third embodiment of the present invention. In the figure, the same reference numerals are given to those using the same components as the opening / closing operation device 21 of the first embodiment. Opening / closing device 3 of the third embodiment
4, the pilot pressure receiving portion 8L of the pilot switching valve 7
A two-position electromagnetic switching valve 35 is provided in the pilot circuit between the pilot pump 17 and the pilot pump 17, and a two-position electromagnetic switching valve 35 'is provided in the pilot circuit between the pilot pressure receiving portion 8R and the pilot pump 17. Established. Then, a switch 24L is connected to the solenoid 36 of the electromagnetic switching valve 35.
And the switch 24L was connected to the solenoid 36 'of the electromagnetic switching valve 35'. Thus, when the switch 24L is turned on, the electromagnetic switching valve 35 is switched from the tank communication oil passage position to the pilot pressure supply oil passage position H. Accordingly, the pilot pressure from the pilot pump 17 acts on the pilot pressure receiving portion 8L via the pilot pressure supply oil passage position H of the electromagnetic switching valve 35, and the pilot switching valve 7 is switched to the position A. Next, when the switch 24L is turned off and the switch 24R is turned on, the electromagnetic switching valve 35 'is switched from the tank communication oil passage position G' to the pilot pressure supply oil passage position G '. Accordingly, the pilot pressure from the pilot pump 17 acts on the pilot pressure receiving portion 8R via the pilot pressure supply oil passage position H 'of the electromagnetic switching valve 35', and the pilot switching valve 7 is switched to the B position. The operation and function of the opening / closing device 34 of the third embodiment are the same as those of the opening / closing device 21 of the first embodiment.

[0012]

When a hydraulic excavator equipped with a crusher at the tip of a work attachment performs small division of a concrete block or the like, the operation is usually performed by pedal operation. This foot-operated pilot valve operation has a large operating force and a large operation stroke, so that the foot is tired at an early stage and the driver suffers. However, in the opening / closing operation device of the present invention, the left and right pilot pressure receiving portions of the pilot switching valve for controlling the hydraulic cylinder for crushing communicate with the pilot pressure hydraulic pressure source via the electromagnetic switching valve, and the solenoid of the electromagnetic switching valve communicates with the solenoid. A switch for opening and closing the crusher is provided between the power supply and the power source, and the direction of the pilot switching valve is switched by operating the switch, and the switch is disposed on an operation lever for operating the work attachment. Thus, the opening and closing operations of the crusher can be performed by pressing the switch with a small search force of the finger. The operation force of the switch operation is light, and the operation stroke is very short. The pedal device in the prior art is not required, and the tire is not tired even after a long operation, so that the workability of the subdivision work can be improved.

[Brief description of the drawings]

FIG. 1 is a main part circuit diagram showing an opening / closing operation device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a switch according to the present invention is provided on a grip of an operation lever.

FIG. 3 is a partial cross-sectional side view of a push-on switch that can be used in the present invention.

FIG. 4 is a main part circuit diagram showing an opening / closing operation device according to a second embodiment of the present invention.

FIG. 5 is a main part circuit diagram showing an opening / closing operation device according to a third embodiment of the present invention.

FIG. 6 is a side view of main parts of a hydraulic shovel equipped with a crusher for small splitting.

FIG. 7 is a main part hydraulic circuit diagram showing a conventional switching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crusher 2 Work attachment 6 Hydraulic cylinder for crushing 7 (for crushing) Pilot switching valve 8L, 8R Pilot pressure receiving part 11 Main pump 17 Pilot pump 21, 32, 34 Opening / closing operation device 22, 35, 35 'Electromagnetic switching valve 23L , 23R, 36, 36 'solenoid 24L, 24R switch 25 power supply 33 double-press switch

Claims (1)

(57) [Claims] A crusher is mounted at the tip of a work attachment of a construction machine, and a crushing hydraulic cylinder inside the crusher is operated to expand and contract. The pilot pressure receiving section and the pilot pressure hydraulic pressure source are communicated via an electromagnetic switching valve, and a switch for opening and closing the crusher is provided between a solenoid of the electromagnetic switching valve and a power supply, and the switch is a switch.
Operation to switch the direction of the pilot switching valve.
As a result, the contraction operation and extension of the crushing hydraulic cylinder are performed.
An opening and closing operation device for a crusher , wherein each of the operation units is capable of operating a long operation, and is disposed on an operation lever for operating the work attachment.