JPH0730832Y2 - Hydraulic fishing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a hydraulic chipping machine applied to a chipping work for scraping a wall surface such as a concrete wall.

[Prior Art] Examples of conventional technologies include Japanese Utility Model Laid-Open No. 58-79314 and Japanese Patent Laid-Open No. 61-237605.

[Problems to be solved by the invention] In a hydraulic fishing machine having a hydraulically driven piston and a plurality of chisels that are tapped by the pistons, in order to tap each chisel with the pistons each time the piston advances. When pressing each chisel in the return direction with compressed air, it is necessary to connect an air supply source such as a compressor to the hydraulic fishing machine in addition to the hydraulic pipeline, which reduces workability and complicates piping. There is a problem.

The present invention aims to solve the above problems.

[Means for Solving the Problems] The hydraulic sprinkler of the present invention moves into and out of the chisel insertion holes formed in parallel with the front cap that is continuously provided in front of the cylinder of the sprinkler body. In a hydraulic fishing machine in which a plurality of chisels that are struck by a piston that can be inserted are slidably inserted in the axial direction, a diameter expansion portion of the chisel is provided in a part of each chisel insertion hole. Are formed so as to be slidably fitted together, and the front of each of the slide holes is formed with a gas filling chamber filled with gas for urging the expanded diameter portion in the returning direction, and the front The cap has a structure in which a gas passage communicating with each of the gas sealing chambers is formed.

[Operation] When a plurality of chisels are struck all at once by the moving pistons and move forward, the enlarged diameter part of each chisel is formed on the front side in each tightly fitted slide hole, and the chisels are mutually connected by the gas passages. When the gas in each communicating gas chamber is compressed and the piston retracts and each chisel is released, the expanded part of each chisel is pressed in the return direction by the compressed gas in each gas chamber. Then, each chisel returns to the retracted end.

[Advantages of the Invention] Since the present invention is configured as described above, each time the piston retracts, the expanded portion of each chisel is pressed in the return direction by the compressed gas and each chisel is properly retracted. It is possible to return to the moving end, and it is possible to solve the problem that the chisel stays at the advancing end or at an intermediate position between the advancing end and the retreating end and the chisel cannot be tapped at once.

In addition, since each chisel is pressed in the return direction by the enclosed gas, piping for connecting the compressor and the main body of the chipping machine is not required, and the workability of the chipping work can be improved, and each chisel can be returned and moved. There is an effect that the mechanism can be simplified and made compact.

[Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS.

For example, in a hydraulic hammer which is mounted on the tip of a boom of a civil engineering machine to scrape a surface of a concrete wall or the like while moving along the surface, a piston 2 is installed in a shaft hole of a cylinder 1 of a main body H of the hammer. Is tightly fitted so as to be slidable in the direction, and a cylindrical back cap 3 having a lid is concentrically connected to the rear of the cylinder 1 and the cylinder 1
A front cap 4 is concentrically connected to the front of the.

A transformer oil chamber 5, a low pressure oil chamber 6, and an inner wall surface of the cylinder 1,
A switching oil chamber 7, a high-pressure oil chamber 8, and an air chamber 9 in which the front end portion of the piston 2 is loosely inserted are circumferentially recessed and arranged in order from the rear.

A front expanded portion 2b and a rear expanded portion 2c are circumferentially projected around the central portion of the piston 2 with a reduced diameter portion 2d therebetween.
The rear pressure receiving surface 2e is formed on the rear end surface of 2c, while the front expanded portion
A front pressure receiving surface 2f having a smaller area than the rear pressure receiving surface 2e is formed on the front end surface of 2b.

A cylindrical plunger 31 is slidably and tightly fitted in a casing 30a of a switching valve 30 attached to the cylinder 1 for switching the moving direction of the piston 2 and communicated with a variable oil chamber 5 of the cylinder 1. Chamber 30b is formed,
An inner wall surface of the plunger chamber 30b is connected to a hydraulic pump 29 via a high pressure oil passage, and is connected to an oil tank 33 via a low pressure oil passage 38 to a low pressure oil chamber 6 of the cylinder 1. A low pressure chamber 34 in communication, a switching chamber 35 in communication with the switching oil chamber 7 of the cylinder 1, and a front high pressure in communication with a high pressure oil chamber 8 of the cylinder 1 connected to a hydraulic pump 29 via a high pressure oil passage. Room
36 and 36 are formed in order from the rear.

When the plunger 31 of the switching valve 30 retracts, the cylinder 1
The high pressure oil is supplied into the transformer oil chamber 5 and the rear pressure receiving surface 2e is pressurized, and the piston 2 moves forward due to the area difference between the front and rear pressure receiving surfaces 2f and 2e. When the piston 2 moves to the forward end, the plunger 31 moves forward to supply the low pressure oil into the variable pressure oil chamber 5, and the front pressure receiving surface 2f of the piston 2 is pushed backward by the high pressure oil in the high pressure oil chamber 8. The piston 2 retracts rearward, and the series of operations described above are repeated, so that the piston 2 repeatedly advances and retracts.

The front and rear ends of the dust tube 27, which is inserted into the center hole 2h of the piston 2 and has an opening projecting forward of the front cap 4, are inserted into the center of the back cap 3 and the center of the front cap 4. The dust that has been worn and scraped off by the chipping operation is absorbed into the dust tube 27 and is sent to the rear of the back cap 3 through the dust tube 27.

The front cap 4 has a plurality of chisels 22 arranged in a planetary pattern around the axis of the cylinder 1 and struck all at once by the pistons 2 that have moved forward, each of which is fitted so as to be slidable in the axial direction. Chisel insertion holes 23 are provided so as to extend in parallel along the axial direction, and a part of each chisel insertion hole 23 is slidably provided with a diameter-expanded portion 22a formed in the rear portion of each chisel 22 so as to project circumferentially. The slide holes 24 that are tightly fitted and have an enlarged inner diameter are formed.
A gas filling chamber 25, in which a gas such as nitrogen gas is filled, is defined on the front side inside by the expanded diameter portion 22a of the chisel 22, and at the rear side of each slide hole 24, the air chamber 9 of the cylinder 1 is formed.
The air chambers 26 that are communicated with each other are partitioned and formed.

In front of each slide hole 24, a gas passage 28, which communicates with each gas filling chamber 25, is formed along the circumferential direction of the front cap 4.

When the piston 2 advances and each chisel 22 is struck, the gas in each gas filling chamber 25 is pressed and compressed by the expanded diameter portion 22a of the chisel 22, and the piston 2 retreats to cause each chisel 22 to move. When released, the expanded diameter portion 22a of each chisel 22 becomes
The gas compressed therein presses the chisel 22 in the return direction, and each chisel 22 returns to the retracted end.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

In this example, each chisel insertion hole 23 formed in parallel with the front cap 4 provided in front of the cylinder 1 of the main body H of the fishing machine is provided with a piston 2 inserted in the cylinder 1 so as to be movable back and forth. In a hydraulic fishing machine in which a plurality of each chisel 22 to be tapped is slidably inserted in the axial direction, the enlarged diameter portion 22a of the chisel 22 is slidably tightly fitted in a part of each chisel insertion hole 23. The inside of each slide hole 24 is formed, and the enlarged diameter portion 22 is formed on the front side of each slide hole 24.
Gas filling chamber 25 filled with gas that urges a in the return direction
And a gas passage 28 communicating with each gas sealing chamber 25 is formed in the front cap 4.

Therefore, each time the piston 2 retracts, the expanded diameter portion 22a of each chisel 22 is pushed back in the return direction by the gas compressed in each gas filling chamber 25, and each chisel 22 is properly returned to the retracted end. It is possible to move the chisel 22 and solve the problem that the chisel 22 stops at the advancing end or an intermediate position between the advancing end and the retracting end and the chisel 22 cannot be tapped at once.

In addition, since each chisel 22 is pressed in the return direction by the enclosed gas, piping for connecting the compressor and the main body of the chipping machine is not required, and the workability of the chipping work can be improved and each chisel can be returned and moved. There is an effect that the mechanism of can be simplified and made compact.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side sectional view of a hydraulic fishing machine showing a state in which a piston is advanced, and FIG.
The drawing is a side cross-sectional view of the hydraulic fishing machine showing a state in which the piston is retracted. 1 …… Cylinder 2 …… Piston 4 …… Front cap 22 …… Chisel 22a …… Expansion part 23 …… Chisel insertion hole 24 …… Slide hole 25 …… Gas filling chamber 28 …… Gas passage H …… Cropper Body

Claims (1)

[Scope of utility model registration request] 1. A chisel insertion hole formed in parallel with a front cap continuously provided in front of a cylinder of a lifting machine body is struck by a piston fitted in the cylinder so as to be movable back and forth. In a hydraulic fishing machine in which each of the plurality of chisels is slidably inserted in the axial direction, a slide hole in which the enlarged diameter portion of the chisel is slidably fitted is partially provided in each of the chisel insertion holes. Gas sealing chambers, which are respectively formed and in which gas for urging the expanded diameter portion in the returning direction is sealed, are formed in front of the slide holes, respectively, and the front cap is connected to the gas sealing chambers. A hydraulic fishing machine characterized by forming a gas passage.