JPH0799077B2 - Punching device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for boring a rock mass containing only collapsed soil or rock containing collapsed soil.

[Prior Art and Problems Therefor] As a conventional punching device, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 51-128803 applies rotation and impact to a shank 2 and a rod 4 connected by a joint 3. A drilling machine 1 for drilling rocks with a bit 13 attached to the tip of
A pipe 5 is rotatably and reciprocally provided around the rod 4, and a motor 7 independently rotates the pipe 5 through a gear 8, a sliding sleeve 21, a chuck 6 and a collet device 14, and at the same time, a hit is made. Giving shack 2
The spring 10, the chuck 6 and the collet device 14
A striking force is applied to the pipe 5 via the.

However, since the striking force from the shack 2 is transmitted to the pipe 5 of the conventional punching machine 1 via the spring 10, the chuck 6 and the collet device 14, the impacting action loosens the surrounding ground unnecessarily. There was a problem that it might collapse.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned conventional problems. The object of the present invention is to prevent the surrounding ground from being unnecessarily loosened or collapsed to fill a hole that has been drilled. The purpose of the present invention is to provide a drilling device that enables appropriate construction depending on the condition of the ground.

[Structure of the Invention] The punching device of the present invention is a punching device having a collapse prevention casing around a rod having a drill bit at the tip, and the casing is rotatably attached to the body of the punching device, and the casing is A rotary drive device such as a hydraulic motor for rotationally driving is attached to the outside of the main body, and an operating sleeve for holding the base end portion of the rod is rotatably mounted in the main body, and the operating sleeve is provided with a spline through the spline. A piston, which is slidably engaged, is slidably housed in the main body in the front-rear direction, and compressed air is introduced to push the piston forward to strike the bottom of the rod. A screw shaft that is formed in the main body and meshes with the internal teeth formed in the piston is provided in the main body so as to be rotatable only in one direction.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
explain.

In FIG. 1, reference numeral 1 is a body of a punching device, in which a piston 2 is housed so as to slide in the front-back direction, and is pushed forward by compressed air introduced into a compressed air chamber 3. , The butt of the rod 4 is hit.

Reference numeral 5 denotes a screw shaft, which is an internal tooth formed on the piston 2.
It meshes with 2a. Ratchet at the rear end of the screw shaft 5
5a is attached, and the screw shaft 5 can rotate only in the direction of arrow A.

A spline 2b is formed around the front portion of the piston 2 and is slidably engaged with the operating sleeve 6.

A base end portion of the rod 4 is inserted in a front portion of the operating sleeve 6 and is held so that the rod 4 can slightly slide forward and backward.

The operating sleeve 6 is rotatably mounted in the main body 1, and its rotational force is transmitted to the rod 4.

A casing 8 is rotatably attached around the main body 1. The casing 8 extends forward so as to surround the rod 4 over the entire length thereof, and a tip portion of the rod 4 is provided. It reaches up to near the rear part of the bit 4a attached to.

A hydraulic motor 9 is attached to the outside of the main body 1 so as to independently rotate the casing 8 with respect to the rod 4 via a dedicated rotation transmission means.

Since the punching device of the present embodiment is configured as described above, when compressed air is introduced into the compressed air chamber 3, the piston 2 is pushed forward, and the tip of the rod 4 is pushed to the bit 4a at the tip. Reportedly. The screw shaft 5 rotates in the direction of arrow A as the piston 2 moves forward.

The piston 2 is pushed backward by the reaction of the impact on the rod 4, and at this time, the screw shaft 5 tries to rotate in the direction opposite to the arrow A, but the screw shaft 5 is rotated by the ratchet 5a.
Since the rotation is blocked, the piston 2 rotates in the direction of arrow A by its reaction.

The rotational force of the piston 2 is transmitted to the rod 4 via the operating sleeve 6 and slightly rotates the bit 4a.

On the other hand, independently of the rotation of the rod 4, the casing 8
Rotates, and as a result, the frictional force with the hole wall is reduced,
The casing 8 can be easily entered or pulled out.

EFFECT OF THE INVENTION An operating sleeve (6) for holding the base end portion of a rod is rotatably mounted in the body of a punching device, and a piston (2) slidably engaged with the operating sleeve via a spline. ) Is slidably housed in the main body in the front-rear direction, and a compressed air chamber (3) for introducing compressed air to push the piston forward and hit the butt of the rod is provided in the main body behind the piston. Since the screw shaft (5) formed and meshing with the internal teeth formed on the piston is provided rotatably in only one direction in the main body, the striking force to the rod is not transmitted to the collapse prevention casing. As a result, there is no risk of unnecessarily loosening or collapsing surrounding rocks to fill holes that have been drilled, and proper construction is possible depending on the condition of the rocks.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing an embodiment of the present invention. 1 ... Main body, 2 ... Piston, 2a ... Inner teeth, 2b ... Spline, 3 ... Compressed air chamber, 4 ... Rod, 4a ... Bit, 5 ... Screw shaft, 5a ... Ratchet, 6 ...... Operating sleeve, 8 ...... Casing, 9 ...... hydraulic motor.

Claims (1)

[Claims] 1. A drilling device having a collapse preventing casing around a rod having a drilling bit at its tip, and a hydraulic pressure for rotatably mounting said casing (8) on the body of said drilling device and rotating said casing. A rotation drive device (9) such as a motor is attached to the outside of the main body,
An operating sleeve (6) holding the base end of the rod is rotatably mounted in the main body, and a piston (2) slidably engaged with the operating sleeve via a spline is provided in the main body. A compressed air chamber (3), which is slidably housed in the front-rear direction, introduces compressed air and pushes the piston forward to strike the butt of the rod, is formed in the body behind the piston, and the compressed air chamber (3) is formed in the piston. A perforating device characterized in that a screw shaft (5) that meshes with the formed internal teeth is provided in the main body so as to be rotatable only in one direction.