JPS5837292A - Drilling machine of which piston striking position is made changeable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a part of a cylinder of a drilling machine, and more specifically, to moving the opening position of a fluid passage for supplying pressure fluid to or discharging pressure fluid from the cylinder chamber. It relates to a flexible structure.

A hole drilling machine, especially a winding machine, produces one V from the drilled hole.
When pulling out the tool, the bit at the tip of the rad interferes with the inside of the hole, resulting in rough edges, which significantly reduces work efficiency. For this reason, various countermeasures have been proposed in the past, but these have not been sufficient as they have led to larger and more complicated winding machines and problems with durability.

The present invention facilitates the withdrawal of the rod by means not previously available, and exhibits excellent effects with a simple structure.

Examples thereof will be described below.

FIGS. 1 and 2 show ill embodiments, and
lml is formed in the shank rad 2 at the tip, the piston 3 that strikes the shank rad 2, the cylinder 4 into which the piston 3 is slidably inserted, and the cylinder 4, which communicates with the cylinder front chamber 5. It has a fluid passage 6 and a fluid passage 8.9 communicating with the rear cylinder chamber 7. A switching valve IO is provided in the fluid passage 8, and the fluid passages 8 and 6 are communicated via this switching valve IO. A cylindrical cylinder liner 11 is fitted into the piston sliding portion of the cylinder 4.

This cylinder liner 11 s fluid it passage 6 t
A port 12 for opening into the cylinder front chamber 5 and a port 13 for opening the fluid passage 9 into the cylinder front chamber or rear chamber 7 are provided. The cylinder liner 11 is slidably inserted into the cylinder, and small chambers 14, 15 are provided at the front and rear ends of the cylinder liner 11, through which fluid from a fluid pressure source (not shown) enters and exits.

The ports 12 and 13 are formed so that the side facing the fluid passage 6 or 9 is longer in the piston sliding direction than the opposite side, so that even if the cylinder liner 11 slides, the fluid passage 6 or 9 is always connected to the port. 12, opens into the cylinder chamber via l'3.

Next, the operation of the winding machine I having the above structure during drilling will be explained with reference to FIG. In this case, the cylinder liner 11 is fixed in a retracted position by feeding fluid into the small chamber 14 at the front end. The figure shows the state at the moment when the piston 3 hits the shank-rad 2, and JE compressed air is supplied to the rear chamber 7 through the passage 8. Immediately after this, piston 3
The air pressure in the front chamber 5 compressed by the forward movement of the front chamber 5 passes through the passage 6 and acts on the switching valve lO, thereby making the passage 8 and the passage 6 communicate with each other. As a result, compressed air flows through the passage 81 passage 6°
2 to the front chamber 5, and the rear chamber 7 communicates with the exhaust passage 9 through the port 13, so that the piston 3 retreats. When the port 13 is closed due to retraction, the rear chamber 7 becomes compressed, and when the pressure increases, the switching valve 1G is switched to cut off communication between the passage 8 and the passage 6, and the passage 8 is connected to the rear chamber 7.
The piston 3 is communicated with the rear chamber 7 to supply compressed air to the rear chamber 7, and the piston 3 is moved forward again, resulting in the state shown in the figure. The hole is drilled by repeating this operation.

Next, the operation when pulling out the -rad will be explained with reference to FIG. First, the pressure fluid that has been fed into the small chamber 14 at the front end of the cylinder liner 11 is switched by means not shown and sent into the small chamber 15 at the rear end, thereby fixing the cylinder liner 11 in the advanced position. Therefore, since the ports 12 and 13 of the cylinder liner 11 also move from the positions A1 and eBt in FIG. The switching timing of the switching valve 1G due to the increase in air pressure is delayed compared to that in the 1x diagram, and the striking point of the piston 3 moves from the position Pi to the position P2. Due to this impact, the collar portion 28 of the shank jid 2 comes to collide with the foot head portion 11 of the threader main body 1, and the threader 1 is pulled rearward using the reaction. This allows the rod to be pulled out very easily.

In the above embodiment, the sliding of the cylinder liner 11 was performed using pressure fluid, but the effects of the present invention can be sufficiently obtained even if the cylinder liner 11 is moved manually. Also, Poe) 12.1
Although the position of No. 3 was performed by sliding the cylinder liner 11, it is also possible to change the position by rotating the cylinder liner 11 by changing the shape of the ports 12, 13, etc.

As described above, according to the present invention, holes are punched in a winding machine or the like.
When pulling out the rod, the striking force of the rod is applied to the winding machine body by displacing the striking point of the piston that slides inside using an extremely simple structure, and the reaction force is used to pull out the rod. , the drawing operation can be easily performed, and the drilling operation can be made highly efficient. In addition, the winding machine does not need to be large or complicated, and can be easily disassembled and assembled, so it has high practical value.

BRIEF DESCRIPTION OF THE DRAWINGS The figures show embodiments of the present invention, and Figure 1 shows a cross-sectional view of the winding machine during normal drilling, and Figure 2 shows a cross-sectional view of the winding machine when pulling out the rod.

Claims (1)

[Claims] A drilling machine that has a piston that strikes a rod placed at the tip of the main body, a cylinder into which the piston is slidably inserted, and a fluid passage formed in the cylinder and communicating with the cylinder front chamber or the cylinder rear chamber. A cylindrical cylinder liner is fitted into the piston sliding part of the cylinder, and a boat is provided in the cylinder liner for opening the fluid passage into the front and rear chambers of the cylinder. , a drilling machine with variable striking position of the piston, characterized in that the opening position of the port to the front and rear chambers of the cylinder is slidably or rotatably provided so as to be switched between at least two positions in the sliding direction of the piston. .