JPH01239290A - Pneumatic drilling device - Google Patents

Abstract

PURPOSE:To contrive the improvement of work efficiency enabling a remote control to be performed by mounting a control sleeve to be fitted into a cylindrical housing and sliding the control sleeve by sleeve controlling air switching a forward-reverse control mechanism of an impact piston. CONSTITUTION:In case of advance action, because no sleeve controlling compressed air is supplied into a pressure receiving chamber 15, a control sleeve 7 is placed in a forward control position, and an impact piston 5 repeats high speed advancing and low speed retracting by driving compressed air, advancing a device total unit. In case of retracting motion, the controlling compressed air is fed via an air feed-in line 11, and the control sleeve is placed in a retracting control position, repeating the action sliding the impact piston 5 to the front at a low speed next retracting it to the rear at a rapid speed. ln this way, controllability and work efficiency can be improved by enabling a remote control to be performed by supplying and discharging the sleeve controlling compressed air.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pneumatic drilling machine aK having a percentage mark on a sleeve control mechanism portion of an advance/backward control mechanism disposed in a cylindrical housing of a main body of the drilling machine. It is related to

(Prior Art) A conventional example of the forward/backward control mechanism of the pneumatic drilling device is as follows:
A middle cylinder with a pressurized air supply path is provided protruding within the cylindrical housing of the drilling device main body, and a control sleeve that can be switched between a forward control position and a backward control position is fitted to the inner end of the core cylinder, and the control is performed by Sleeve switching, in which an impact piston with a control hole is fitted in a sleeve so as to be telescopically slidable, and the control sleeve is switched between a forward control position and a backward control position by pulling or twisting an air supply hose connected to the control sleeve. The pneumatic drilling device is switched between forward operation and backward operation by switching the control sleeve between a forward control position and a backward control position by means of an air supply hose, and changing the communication position of a control opening provided in the impact piston. It has a structure.

(Problems to be Solved by the Invention) The conventional sleeve control mechanism in the pneumatic drilling device has a structure in which the control sleeve is switched between a forward control position and a backward control position by pulling or twisting the air supply hose. Since the pneumatic perforation device is moved forward and backward by impact with respect to the air supply hose, it is difficult to switch the control sleeve between the forward control position and the backward control position, resulting in operational reliability problems and remote control. However, there are problems such as the air supply hose being seriously damaged and the preparation work taking a lot of time, resulting in a significant drop in work efficiency.

The present invention has been developed to address the above-mentioned problems, and its purpose is to remotely control switching of the control sleeve, that is, switching between forward and backward operation of the drilling device. The object of the present invention is to provide a pneumatic drilling device that has improved operating performance, switching performance, operational reliability, and work efficiency.

(Means for Solving the Problems) The present invention provides a structure in which an inner end of a middle cylinder with a pressurized air supply passage protruding in a cylindrical housing of a main body of a punching device is slidable between a forward control position and a backward control position. A control sleeve that can be switched is fitted, and an impact piston with a control hole that is slidable and extendable is fitted into the control sleeve, so that the inside of the impact piston is a rear variable volume chamber, and the inside of the housing is a front variable volume chamber and an exhaust path. In a pneumatic drilling device equipped with a forward/backward control mechanism divided into a rear exit chamber, the middle cylinder body is provided with a pressurized air supply passage for controlling the sleeve, a compression spring is disposed opposite to one of the control sleeves, and the other is provided with a compression spring. The structure is characterized in that a pressure receiving chamber communicating with the pressurized air inlet passage is provided and a sleeve control mechanism is provided for switching between a forward control position and a backward control position. By supplying and discharging compressed air for controlling the sleeve into the room and using a compression spring, switching of the control sleeve can be controlled remotely, improving switching performance and operational reliability.

(Function) When compressed air for controlling the sleeve is not supplied to the pressure receiving chamber of the control sleeve, the control sleeve is slid and held at, for example, the forward control position by the compression tin ring, and the drilling device is moved forward, and the middle cylinder is moved forward. When compressed air for sleeve control is supplied into the pressure receiving chamber from the pressurized air supply chamber for controlling the sleeve, which is equipped with body pressure, the control sleeve is switched to and held in the backward control position, the drilling device is operated backward, and the control sleeve is switched. The control sleeve is not particularly affected by the forward or backward operation of the drilling device, and can be reliably moved to the forward and backward control positions by spring biasing force and compressed air force. The forward and backward operations of the drilling device are performed smoothly.

(Embodiment) An embodiment of the present invention is shown in FIGS. 1 to 5, and (
1) is a punching device main body having a cylindrical (cylindrical) housing, and (2) is a flange (2a) attached to the end of the punching device main body (1), with an inner end (2b) inside the cylindrical housing. A protruding middle cylindrical body, (3) a driving pressurized air supply passage provided at the center Kff of the middle cylindrical body (2), (4) an exhaust passage penetrating the hook part (2a), ( 5) is an impact piston that is formed hollow and forms a rear variable volume chamber (10a) therein and has a sliding part (5a) for the control sleeve (7); (6) is an impact piston on the side wall of the impact piston (5); The drilled control hole (7) is fitted into the inner end of the middle cylinder (2) and is inserted into the stepped part (2) of the middle cylinder (2).
2C
At the inner end of the inner box body (2), there is a control sleeve that can be slid and switched between the forward control position and the backward control position (a control opening is inserted into the control sleeve (7) and is telescopically slidable into the control sleeve (7)). (6
) with an impact piston (5) and then install the impact piston (5) with
) is a rear variable volume chamber (10a), and the inside of the housing is divided into a front variable volume chamber (10b) and a rear exit chamber (10c) with an exhaust path (4). , a pressurized air inlet passage αD for controlling the sleeve is provided in the middle cylinder (2), a compressed tin ring (14) is provided opposite to one side of the control sleeve (7), and a pressurized air inlet passage αD is provided in the other side of the control sleeve (7).
This is a pneumatic drilling device that has a pressure receiving chamber C151 communicating with υ and a sleeve control mechanism that switches between a forward control position and a backward control position.

At the outer ends of the pressurized air supply path (3) and the normal air inlet path Ql), supply hoses for compressed air for driving and compressed air for sleeve control are individually connected, and pressurized air is supplied via operation valves, etc. Connected to a supply source (not shown).

The control sleeve (force) is fitted axially slidably in an annular groove provided at the inner end of the middle barrel (2) and
) between the step (2C) of the flange (2a) fitted to the inner end of the flange (2a) and the opposing step (2i), the forward control position fil (left side fil in the figure) and the backward control position It (right side position ), and the compression spring I is disposed between the control sleeve (force) and the stepped portion (2d), and the pressure receiving chamber 0 is placed opposite the stepped portion (2C). Swipe (
In the central part of the force, an auxiliary annular chamber αe, a radial hole opening, and an auxiliary annular chamber a& are connected from the inner surface side, and the control space IJ-) (7)
A sliding portion (7aX7b) is provided on the outer periphery of the impact piston (5) for slidingly contacting the inner surface of the sliding portion (5a) of the impact piston (5). a in the diagram
2α& is a radial hole connected to the pressurized air supply path αD.

The embodiment of the present invention has the above-mentioned structure, and its operation will be explained in detail. In the case of forward operation, compressed air for controlling the sleeve is supplied into the pressure receiving chamber α (see FIG. 1). As shown, the control sleeve (the force is applied by the compression spring α) moves to the forward (left side in the figure) forward control position and is held at the same position by the step (2c), and the air supply hose (not shown)
The driving compressed air supplied from the middle cylinder body (2) is introduced into the rear variable volume chamber (10a) in the impact piston (5) through the pressure air supply path (3) of the middle cylinder body (2), and the air pressure increases, causing the impact piston to (5) moves forward at a relatively high speed and collides with the head inner surface (1b) of the punching device main body (1) with the piston head (5b), and the impact force causes the piston head (5b) to collide with the punching device main body (1) as shown in the figure. The entire device is advanced underground.

After the collision, the impact piston (5) becomes K as shown in Figure 1, and the control opening (6) is connected to the control sleeve (force sliding part (7a)).
Furthermore, the compressed air is removed from the flange (2b) of the hollow body (2), and the compressed air in the rear variable volume chamber (10a) passes through the control hole (6) and is introduced into the front variable volume chamber (10b). Since the pressure receiving area on the front variable volume chamber (10b) side of (5b) is large, the impact piston (5) moves backward (towards the right in the figure).

When the impact piston (5) is retracted to the position shown in Figure 2, the control aperture (6) is closed, but the impact piston (5) is retracted due to inertia and expansion of the compressed air in the front variable volume chamber (4ob). When the impact piston (5) reaches the position shown in Fig. 3, the control hole (6) communicates with the rear exit chamber (10C), and the compressed air in the front variable volume chamber (10b) flows through the control hole. (6), and is discharged to the outside from the exhaust passage (4) through the rear exit chamber (1oc).

The retraction of the impact piston (5) is stopped by the discharge of the compressed air and the compressed air in the rear variable volume chamber (IQa), and conversely, it starts moving forward (to the left in the figure) and the operation is repeated. It becomes a forward movement that returns.

Next, in the case of reverse operation, pressurized air supply path αυ for reverse control
Compressed air for controlling the sleeve is supplied within the control sleeve (7), and the compressed air is sent into the pressure receiving chamber 0 of the control sleeve (7) through the radial hole az. The compressed air can be used as the same pressurized air supply source as the driving compressed air supplied into the pressurized air supply path (3), and can be obtained by switching a valve or the like.

When compressed air is sent into the pressure receiving chamber (■), the control sleeve (7) is slid backward (to the right in the figure) against the spring αa due to the air pressure, and becomes the backward control position shown in Fig. 4 at the stepped portion (2d). is held at the same position, and the pressure air supply path Ql
The compressed air in the auxiliary annular chamber C161, the radial hole αη,
It is fed into the front variable volume chamber (10b) through the auxiliary annular chamber α& and further through the control aperture (6).

At the same time, compressed air is supplied from the pressurized air supply path (3) into the rear variable volume chamber (10a), and the pressure inside the rear variable volume chamber (10a) increases, causing the impact piston (5) to move forward (left side in the figure).
The rear variable volume chamber (10a) is slid at a relatively slow speed.
) (see Figure 1), compressed air in the rear variable volume chamber (10a) flows through the control hole (6).
The impact piston (5) is introduced into the front variable volume chamber (10b) through the front variable volume chamber (10b), and the impact piston (5) moves backward relatively rapidly due to the difference in the pressure receiving area of the piston head (5b), similar to the piston retraction described in the case of forward operation. (to the right in the figure), and the middle cylinder (
2) collides with the end surface (2e) of the flange (2a), and the entire illustrated device is moved backward together with the punching device main body (1) (see FIG. 5).

At this time, the control hole (6) communicates with the rear exit chamber (10c), and the compressed air in the front variable volume chamber (10b) flows through the control hole (6), the rear exit chamber (IOC), and the exhaust path (4). ), the air pressure in the front variable volume chamber (10a) drops to atmospheric pressure, and the impact piston (5) is moved forward by the pressure air in the rear variable volume chamber (10a). The operation is repeated and it is operated backwards.

Upon said advancement of the percussion piston (5) in the opposite direction, the control aperture (6) - momentarily communicates with the auxiliary annular chamber α&pressure, and compressed air is supplied into the front variable volume chamber (10b) as described above. Therefore, the impact piston head (5a) is prevented from colliding with the head inner surface (1b) of the drilling device main body (1) due to the buffering effect of the supplied compressed air.

When the compressed air in the pressure receiving chamber α9 of the control sleeve (force) is discharged, the control sleeve (force) is slid forward (to the left in the figure) by the compression spring I and held at the forward control position, allowing forward movement.

The forward and backward operations are controlled by supplying and discharging compressed air for sleep control through the compressed air supply path αD provided in the middle cylinder (2), and can be controlled remotely. , switching is performed smoothly.

(Effects of the Invention) The present invention has the above-described configuration, and compressed air for sleeve control is supplied, discharged, and compressed from the pressurized air supply chamber provided in the middle cylinder to the pressure receiving chamber provided in the control sleeve. Due to the spring biasing of the spring, the control sleeve is switched and held in the forward control position and the retract control position, so that the switching of the control sleeve, i.e. the forward and retract operation of the drilling device, is not particularly affected by said operation. This is done accurately by remote control, which improves operating performance, switching performance, and operational reliability, significantly improving work efficiency.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that the design may be modified within the scope of the spirit of the present invention. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the forward control position of the control sleeve and the forward operating state of the impact piston during forward operation, and FIG. 3 is a longitudinal sectional view showing the impact piston. Fig. 4 is a longitudinal cross-sectional view showing the compressed air discharge state in the retracted state, Fig. 4 is a longitudinal cross-sectional view showing the retracting control position of the control sleep during retracting operation and when the impact piston is retracted, and Fig. '5 is also a longitudinal cross-sectional view showing the impact piston retracting impact. FIG. 1: Perforation device main body 2: Hollow body 3: Pressure air supply path 4: Exhaust path 5: Impact piston 6: Control opening 7: Control sleeve 11: Pressure air supply path 14: Compression spring
15: Pressure receiving room agent, patent attorney Shige Okamoto, 2 other people

Claims (1)

[Claims] A control sleeve that can be slid and switched between a forward control position and a backward control position is fitted into the inner end of a middle cylinder with a pressurized air supply path that protrudes into the cylindrical housing of the punching device main body, and the control sleeve expands and contracts. A forward/backward control mechanism is provided, in which a sliding impact piston with a control hole is inserted, and the inside of the impact piston is divided into a rear variable volume chamber, and the housing is divided into a front variable volume chamber and a rear exit chamber with an exhaust path. In the pressurized air perforation device, the middle cylinder body is provided with a pressurized air inlet passage for controlling the sleeve, a compression spring is disposed opposite to one of the control sleeves, and a pressure receiving chamber communicating with the pressurized air inlet passage is arranged in the other side. A pneumatic drilling device characterized by being provided with a sleeve control mechanism that switches between a forward control position and a backward control position.