JPH01163390A - Discharger for impact type underground excavator - Google Patents

Abstract

PURPOSE: To reduce construction cost of a shaft by supporting an excavator on an ejector through means of positionally adjustable rollers, and by mounting the ejector on an arm of a power shovel. CONSTITUTION: A shaft 6 is supported with the body of an ejector 1 through the intermediary of bearings 7, while rollers are fixed to the shaft 6 to be movable by means of nuts 5, and a one-way clutch 8 is coupled to the shaft 6. A bucket is removed from a power shovel, and an ejector for a hammer type underground excavator is mounted at its attaching part 2 onto an arm. Furthermore, the excavator 3 is supported to the rollers 4 and is then mounted on the ejector 1. Moreover, a hammering piston 10 is operated by a working fluid such as air in order to hit a chisel 23 for making the excavator 3 advance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a firing device for a percussion-type underground boring machine for forming small-diameter tunnels and conduits underground.

(Prior art) As a conventional launcher of this type, the
2. Description of the Related Art A launching device for an underground excavator (hereinafter referred to as a conventional launching device) described in Publication No. 89 is known. This will be explained below with reference to FIG.

In No. 80, the launch pad 24 has a 7-shaped cross section perpendicular to the axis, and has a guide surface 2 that guides the underground tunneling machine 3 in the launch direction.
5. The front part of the launch pad 24 is pivotally supported on the support body 27 by a hinge pin 26 perpendicular to the axis of the guide surface 25, and the rear part of the launch pad 24 can be tilted to be above the support body 27.

As mentioned above, in the conventional launcher, the support body 27 is placed on an existing flat surface or on a sloped ground, and the launch angle of the launch pad 24 is adjusted by the turn handle 31. The underground excavator can be used to excavate at a precise inclination angle.

(Problems to be solved by the invention) In conventional launchers, the launch pad is set in a shaft, so
Unloading work using a crane, etc. is required. In addition, the bottom of the shaft must be level because the support must be installed horizontally for the direction of the excavator and for stability. Furthermore, since workers operate the launcher inside the shaft, it takes a lot of time and labor to center the excavator, such as driving strong sheet piles into the shaft, and the construction cost of the shaft is high. had.

(Means for solving the problems) Means for solving the problems described above will be explained with reference to FIGS. 1 to 3.

The striking type underground excavator launcher l is removed from the power shovel packet and is attached to the power shovel arm (not shown) by means of a bottle at the attachment part 2. The excavator 3 is supported by the launcher 1 by rollers 4. The roller 4 is fixed to the shaft 6 by a nut 5, but the roller 4 can be moved depending on the tightening position of the nut 5, and the roller 4 can be adjusted depending on the outer diameter of the excavator 3.

The shaft 6 is supported by bearings 7 at both ends of the main body of the firing device 1 and rotates. A one-way clutch 8 connected to one shaft 6 allows the excavator 3 to move only in the advancing direction at the time of impact, and prevents it from moving backwards due to reaction force.

(Function) In FIG. 4, the launcher 1 is moved to the shaft by a power shovel and is set together with the excavator 53 while floating in the shaft. The setting is packet cylinder 14
Operate the 1st position of the launcher 1 by, for example. Launcher 1
When set, the excavator 3 operates the internal striking piston 10 using a working fluid such as air.

The striking piston 10 strikes the chisel 23 of the excavator, thereby causing the entire excavator 3 to move. When the head of the excavator 3 collides with the earth wall, it receives a reaction force from the earth wall when the piston 10 hits, but the one-way clutch 8 prevents the excavator 3 from moving backwards.

Furthermore, the excavator JIJ, 3 is propelled through the soil with the impact of the piston 10, and when the excavator 3 penetrates into the soil to a certain extent, the reaction force at the time of impact is supported by the surrounding friction of the soil, and the excavator 8! It becomes a self-propelled form. (See FIG. 5) (Example) An example of the present invention will be described with reference to FIGS. 5 to 7.

FIG. 6 shows a state in which the firing device 3, which is attached to the arm 9 of the power shovel 11 by means of a bottle, is placed in a shaft. An inclinometer 12 is attached to the launch device 3, and the operator inside the power shovel operates the packet cylinder etc. while detecting the signal, so that the direction of the excavator 3 can be set without entering the shaft. Can be done. An air hose 15 is connected to the excavator 3, and pressurized air sent from a compressor 16 operates a striking piston in the excavator 3.

FIG. 7 shows its working principle. High pressure air is sent into the chamber of the piston through the valve 17, and the piston 10
begins to move forward. (See Figure 7-a) Next, when the piston 10 moves forward to a certain extent, the air 19 in front of the piston is exhausted through the air passage 22 consisting of the air passage groove 20 and the air passage hole 21. (See Figure 7-b) When the piston 10 moves further forward and strikes the chisel 23, high pressure air flows from the air passage 22 to the chamber 19 in front of the piston.

At this time, since the cross-sectional area of the inner chamber 18 of the piston and the chamber 19 in front of the piston is larger, the piston 10 is retracted by the force of the difference in area.

(See Figure 7-c) By repeating the above operation, the piston 10 is moved to the chisel 23.
hit continuously.

(Effects of the Invention) According to the present invention, the setting of an excavator, which conventionally required time and manpower, can be done in a short time and with a small number of people, and the shaft can be simple and small. construction costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view of the launcher according to the present invention, and FIG.
Figure 3 is a cross-sectional view taken along line A-A in the figure, Figure 3 is a cross-sectional view taken along line B-B in Figure 1, Figure 4 is a side view of the launcher attached to the arm of the power shovel set in the shaft, and Figure 5 is a side view of the firing device set in the shaft. FIG. 6 is a side view showing an embodiment of the present invention, and FIG. 7 is a side view showing the operating principle of the digging machine. 1... Launching device 2... Attachment part 3... Excavation machine 4... Roller 5... Nut
6...Shaft 8...One-way clutch 12...Inclinometer Fig. 4 S 1 Fig. 7-a Fig. 7-b j: Iso 1υ Fig. 7-r, M Fig. 8 Write procedure correction Method) % formula % 1- Indication of the case Patent Application No. 207208 of 1988 2- Name of the invention Related: Patent Applicant Telephone: (03) 584-7111 (Main) 6 Contents of the Amendment On page 7, lines 11-12, after “Figure 7 is...a side view,” it is followed by “Figure 8 is a conventional It is a side view of the launcher.'' is added.

Claims (1)

[Claims] a tubular body, an impact piston reciprocating within the body, and an impact piston in an axial direction of action of the body;
In a percussion type underground excavator equipped with a percussion tip to which kinetic energy is applied, the launching device on which the excavating machine is mounted is removed from the bucket of the power shovel, and the arm of the power excavator is attached using a mounting part installed on the launching device. and its link part, the inclination of the launching device body is controlled by a bucket cylinder of the power shovel, etc., the excavator is supported to the launching device by a roller that can be adjusted by its outer diameter, and the roller is attached to a nut. 1. A firing device for an impact-type underground excavator, characterized in that the firing device is fixed to a rotatable shaft, and a one-way clutch is connected to one end of the shaft.