JPH0118303Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic chisel device that uses a piston that moves under the pressure of compressed air to strike the head of a chisel.

Conventionally, automatic chisel devices operated by striking the head of a reciprocably supported chisel with a piston that moved at high speed using the pressure of compressed air. However, the return of a chisel driven out by a piston depends on the method of returning the piston with compressed air pressure and then pressing the chisel against the workpiece. It is difficult to return the chisel without a workpiece, and the tip position of the returned chisel is not constant, making it difficult to accurately hit the tip of the chisel against the workpiece surface. This has been a major obstacle in automating burr and slag removal work using industrial robots. There is also a device that uses a compression spring to return the chisel, but with this structure, it is necessary to operate the chisel against the repulsive force of the compression spring, so the impact force of the chisel is reduced. I had a problem that made me weak.

This invention was made to solve the above problems, and it is possible to automatically return the chisel to the specified position, and when the chisel is hammered out with the piston, only the resistance from the workpiece is applied. An object of the present invention is to provide an automatic chisel device that acts on a chisel. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. Reference numeral 1 denotes a cylindrical body having a piston sliding hole 2, into which a piston 3 is inserted and fitted so as to be able to freely reciprocate and slide. A cap-shaped front lid 4 is screwed onto the front end of the cylinder 1, and a rear lid 6 having a first air supply/exhaust hole 5 is screwed onto the rear end. Also, in the front cover 4, there is a chisel sliding hole 7 concentric with the piston sliding hole 2.
The piston sliding hole 2 and the chisel sliding hole 7 are separated by a guide member 8 screwed onto the front cover 4. Further, the front cover 4 and the guide member 8 are provided with chisel guide holes 9 and 10, respectively, which are concentric with the chisel sliding hole 7. are slidably fitted through each other. A piston portion 11a is formed near the intermediate position of the chisel 11 and is fitted into the chisel sliding hole 7 so as to be slidable back and forth. A second supply/exhaust hole 12 for introducing compressed air is provided on the front side of the piston 3 in the piston sliding hole 2. The front cover 4 also has a third supply/exhaust hole 13 for introducing compressed air into the front side of the piston part 11a in the chisel sliding hole 7, and a third air supply/exhaust hole 13 for introducing compressed air into the front side of the piston part 11a in the chisel sliding hole 7, and A through hole 14 communicating with each other is provided in each case. Further, the first supply/exhaust hole 5 is connected to a compressed air source (not shown) via piping 15 and a two-position, three-port valve 16, and the second and third supply/exhaust holes 12, 13 are for rapid exhaust. Valve 17, 18 and piping 1
2 position 3 port valve 21 via 9 and 20 respectively.
The two-position three-port valve 21 is connected to a compressed air source (not shown). 22
2 is a support member for the cylinder 1, and 23, 24, and 25 are cushion materials.

The device configured in this way operates the 2-position 3-port valve 16 to open the piston 3 in the piston sliding hole 2.
The compressed air on the back side is discharged through the first supply/exhaust hole 5 and piping 15, and the 2-position 3-port valve 21 is operated to discharge piping 19, 20 and quick exhaust valves 17, 18.
When compressed air is supplied to the second and third supply/exhaust holes 12 and 13, respectively, the piston 3 and the piston part 11a are retracted, and the piston 3 is attached to the rear cover 6 through the cushion material 23, and the piston part 11a
are respectively brought into contact with the guide member 8 with the cushion material 24 interposed therebetween, whereby the chisel 11 is returned to the predetermined position. On the other hand, in order to remove burrs and slugs from the workpiece using the chisel 11, the tip of the chisel 11 is brought into contact with the required location, and then the 2-position 3-port valve 21 is operated to remove the piston 3 and the piston part. The compressed air on the front side of 11a is passed through the second and third supply and exhaust holes 12 and 13 to quick exhaust valves 17 and 18.
When the piston 3 is moved forward at high speed and collides with the head of the chisel 11, the piston 3 is moved forward at high speed. This causes the chisel 11 to move forward and impact the workpiece. By repeating the above operations, burrs and slug from the workpiece are removed.

As is clear from the above explanation, in the present invention, a piston is provided near the middle position of the chisel, and compressed air is applied to the piston, so that the piston can be moved back using the compressed air. This allows the chisel to return to its original position after it has been ejected.This allows the chisel to automatically return to its predetermined position.Furthermore, after returning, the compressed air acting on the piston is quickly exhausted. Since the gas is quickly discharged by the valve, no useless resistance is exerted on the chisel, and its impact force is not weakened, resulting in excellent practical effects.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1: Cylindrical body, 2: Piston sliding hole, 3: Piston, 4: Front cover, 7: Chisel sliding hole, 9: Guide hole,
11: Chisel, 11a: Piston part, 13: Supply and exhaust hole, 18: Rapid exhaust hole, 21: 2 position 3 port valve.

Claims (1)

[Scope of utility model registration request] A piston 3 that moves under the pressure of compressed air is slidably inserted into a cylindrical body 1 whose front and rear ends are sealed by a guide member 8 and a rear lid 6, and a front lid 4 is attached to the front end of the cylindrical body 1. The front cover 4 and the guide member 8 constitute a chisel sliding hole 7 and are fitted into it, and a chisel 11 having a piston part 11a at an intermediate position is attached, and its front shaft part is inserted into the chisel sliding hole 7. The front cover 4 is slidably fitted through the front cover 4, with its rear shaft portion positioned in the guide member 8, and the piston portion 11a positioned in the chisel sliding hole 7, respectively. A second supply/exhaust hole 12 for introducing compressed air to the front side of the piston 3 is provided in the front lid 4's dormer section, and a third supply/exhaust hole 12 is provided on the front side of the piston part 11a in the chisel sliding hole 7. An exhaust hole 13 is provided through the rear cover 6, and the third supply and exhaust hole 13 and the second supply and exhaust hole 12 are connected to a compressed air source via a two-position, three-port valve 21. An automatic chisel device characterized in that a supply/exhaust hole 5 is transparently provided, and the first supply/exhaust hole 5 is communicatively connected to a compressed air source via a 2-position 3-port valve 16.