JP2012021264A - Dust prevention system in drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust prevention system in a drilling machine, which is capable of eliminating the need of another operation source, is capable of preventing dust with the minimum water amount, is full of mobility by miniaturization and weight reduction, and reduces workloads of an operator further.SOLUTION: A branch part 3 is provided in an air supply line 7 of compressed air from a compressor 2 to a drilling machine 1, an atomizer 4 for turning water supplied to the air supply line 7 to mist inside a pipe is provided on the downstream side, and a dust prevention device 5 provided with a pneumatic reciprocation pump and capable of forcibly feeding water inside a tank 6 is equipped. An air supply port 21 of the pneumatic reciprocation pump and the branch part 3 are connected, the discharge port of the pneumatic reciprocation pump and the water supply port of the atomizer 4 are connected, and the pneumatic reciprocation pump is driven with only the compressed air from the compressor 2 as an operation source.

Description

  The present invention relates to a dust prevention system for preventing dust generated during drilling by a punch.

  Conventionally, in slope stabilization work and slope protection work, in order to reinforce natural ground mountains and cut slopes, drilling is performed from the slope to the ground with a drilling machine, and lock bolts are placed in the drill holes. Steel bars such as steel bars and reinforcing bars are inserted, and grout material is filled around them to integrate with the natural ground, reducing earth pressure, stabilizing the slope, and improving the bearing capacity. Slope stabilization method to fix structures such as heavy pressure plate or method frame to the slope with anchors, and further assemble a crimped wire mesh along the slope, or carry a pre-assembled unit in factory production to the site After building the formwork by placing it on the surface, the legal form is constructed by spraying mortars into the formwork while burying and killing the crimp wire mesh formwork, and this formwork is then locked to rock bolts or ground anchors. Therefore such anchored combination method Form System for fixing to the natural ground has been actively conducted.

  In the above drilling machine, in order to make the hole wall self-supporting, without using water, use compressed air to discharge dust, use a down-the-hole hammer to drill into the rock, and so on. There is a possibility of drilling while feeding air into the drill rod. However, in this case, there is a problem that dust is caused by discharge of compressed air and the working environment is remarkably deteriorated.

  Therefore, a dust prevention method may be employed in which water is mixed in the compressed air in a sprayed state, sent to a drill rod, and dust is adsorbed by the sprayed water to suppress the generation of dust.

  For example, in Patent Document 1 below, an auger supported by a work machine is provided, and a down-the-hole hammer is provided by a piston hammer on a drilling head provided at the lower end, and a compression supplied from a compressor device. A drilling device that joins air and a fluid supplied from a fluid supply device, supplies the fluid to the down-the-hole hammer side by a supply hose, and performs drilling and drilling by the hammer head, and supplies compressed air and the fluid from the compressor device The merging section for joining the spray water from the apparatus is provided with a first electric on-off valve for opening and closing the supply line for the compressed air and a second electric on-off valve for opening and closing the supply line for the spray water. There has been proposed an excavator having a configuration in which both the first electric on-off valve and the second electric on-off valve are remotely operated.

JP 2008-231806 A

  However, in the case of the dust prevention device as described above, it is necessary to arrange a fluid supply device in order to supply water to the compressed air line. However, an operation source for operating the fluid supply device is separately prepared. There was a need. The prior art also includes a first electric on-off valve that opens and closes a compressed air supply line and a second electric on-off valve that opens and closes the spray water supply line. Both the electric on-off valve and the electric on-off valve are remotely operated, so that the work of the operator can be saved more than before. However, the operator can control the operation of the fluid supply device, the first electric on-off valve and the second electric on-off valve. There is no change in the point of controlling the operation with the valve. In addition to saving labor for the operator, it is easy to carry even if it is on a sloping and poorly secured place such as landslide prevention work with minimum and lightest component equipment. Therefore, it has been strongly desired to reduce the size and weight so that it can be used.

  Therefore, the main problem of the present invention is a drilling machine that can eliminate the need for other operating sources, can prevent dust with a minimum amount of water, is compact and lightweight, has high mobility, and further reduces the burden on the operator. It is to provide a dust prevention system.

In order to solve the above-mentioned problem, as the present invention according to claim 1, a branch portion is provided in the air supply line of compressed air from the compressor to the perforator, and water supplied to the air supply line on the downstream side is provided in the pipe. An atomizer to make the mist,
Equipped with a pneumatic reciprocating pump, equipped with a dust prevention device capable of pumping water in the tank, connected to the air supply port of the pneumatic reciprocating pump and the branch portion, and the pneumatic reciprocating pump A dust prevention system for a drilling machine is provided, in which the pneumatic reciprocating pump is driven by using only compressed air from the compressor as an operating source. Is done.

  In the first aspect of the present invention, the atomizer is provided with a branch portion in the compressed air supply line from the compressor to the perforator, and mists the water supplied to the supply line downstream in the pipe. Is provided. The pneumatic reciprocating pump is equipped with a dust prevention device that can pump water in the tank, and connects the air supply port of the pneumatic reciprocating pump and the branch portion, and the pneumatic reciprocating pump. The discharge port of the dynamic pump is connected to the water supply port of the atomizer.

  Therefore, since the pneumatic reciprocating pump is driven by using only compressed air from the compressor as an operating source, no other operating source is required, dust can be prevented with a minimum amount of water, and a small size can be achieved. Light weight makes it highly maneuverable and improves on-site handling. In addition, since the dust prevention device is driven by compressed air branched from the air supply line to the drilling machine, when the drilling is stopped, the dust prevention device is automatically stopped, so that the operator's workload can be significantly reduced. become.

  As a second aspect of the present invention, the continuous reciprocation of the piston of the pneumatic reciprocating pump is detected by a pressure detection type stroke end sensor provided in the head side port and the rod side port of the cylinder, The dust prevention system in a drilling machine according to claim 1, wherein the piston is reciprocated by control.

  According to the second aspect of the present invention, the position detection of the piston is detected by a pressure detection type stroke end sensor provided at the head side port and the rod side port of the cylinder. Conventionally, there are methods using a limit switch, a proximity switch, a photoelectric switch, a cylinder switch and the like as a piston position detection sensor. The cylinder switch detects a change in magnetism due to the proximity of a piston. A permanent magnet is incorporated into a non-magnetic piston, or the piston itself is composed of a permanent magnet, and a switch provided on the outer periphery of the cylinder is connected to the permanent magnet. It was operated by proximity and always required a power source.

  On the other hand, in the present invention, since detection is performed by a pressure detection type stroke end sensor provided in the head side port and rod side port of the cylinder, there is no work in the pneumatic reciprocating pump. Since the stroke end sensor only needs to be disposed in the rod-side port), the necessary parts are minimized and the manufacture is facilitated.

  According to a third aspect of the present invention, the discharge amount of the pneumatic reciprocating pump is adjusted by an air flow rate adjusting valve provided at a rod side port of the cylinder. A prevention system is provided.

  The invention described in claim 3 is provided with a variable discharge amount function so that the amount of generated dust varies depending on the rock quality, so that the amount of mist (water content) in the compressed air can be adjusted. is there.

  As described above in detail, according to the present invention, other operating sources can be made unnecessary, dust can be prevented with a minimum amount of water, and it has high mobility by being reduced in size and weight, and further, the drilling designed to reduce the work burden on the operator. The dust prevention system in the machine can be provided.

1 is an overall view of a dust prevention system in a punching machine 1. FIG. It is an enlarged side view of the atomizer 4. FIG. The dust prevention apparatus 5 is shown, (A) is a plan view, (B) is a front view, and (C) is a side view. It is a circuit diagram of dust prevention device 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the dust prevention system for a drilling machine according to the present invention, a branch portion 3 is provided in an air supply line 7 for compressed air from the compressor 2 to the drilling machine 1, and water supplied to the air supply line 7 is provided in the pipe downstream thereof. With an atomizer 4 to make a mist
A dust prevention device 5 having a pneumatic reciprocating pump 15 and capable of pumping water in the tank 6 is installed, and the air supply port 20 of the pneumatic reciprocating pump 15 and the branch portion 3 are connected by a fluid hose 8. In addition, the discharge port 26 of the pneumatic reciprocating pump 15 and the water supply port 4 c of the atomizer 4 are connected by a fluid hose 9, and the pneumatic reciprocating pump 15 is compressed air from the compressor 2. Only the drive source.

  This will be described in more detail below.

  As shown in FIG. 1, the drilling machine 1 includes a guide cell 11 supported by a gantry 10, and a drifter drill 12 is mounted on the guide cell 11 so as to move forward and backward. The guide cell 11 can be tilted in the prone direction by a jack 13 provided on the gantry 10, and can be moved back and forth in the axial direction by a jack 14.

  In such a drilling machine 1, when the compressed air is used to discharge dust or a down-the-hole hammer is used to drill the rock mass, a compressor 2 is provided and drilling is performed while feeding the compressed air to the drill rod. It is like that.

  In the present dust prevention system, a mist 3 is provided in the pipe to mist the water supplied to the air supply line 7 on the downstream side of the air supply line 7 for compressed air from the compressor 2 to the perforator 1. The generator 4 is provided. A T-shaped joint can be used as the branch part 3. As shown in FIG. 2, the atomizer 4 has T-joint joints 4a and 4b in the linear direction as air supply lines 7, and a central water supply port 4c with a discharge port at the approximate center of the pipeline. The connection tool having the injection pipe (injection pipe) 16 is provided. The water discharged from the injection pipe 16 is instantaneously atomized by the compressed air flowing through the pipe and is carried on the compressed air.

  The dust prevention device 5 includes a pneumatic reciprocating pump 15 and is a device for feeding water in a tank 6 installed adjacent to the air supply line 7. Specifically, as shown in FIG. 3, the pneumatic reciprocating pump 15 is provided inside the frame frame 19, and an operation air supply port 20, a water inlet 25 and a discharge port 26 are provided.

  The air supply port 20 of the pneumatic reciprocating pump 15 and the branch portion 3 are connected by a fluid hose 8, and the discharge port 26 of the pneumatic reciprocating pump 15 and the water supply port 4 c of the atomizer 4. Are connected by a fluid hose 9. As these fluid hoses 8 and 9, a general pressure-resistant rubber hose or the like can be suitably used.

  The pneumatic reciprocating pump 15 is driven by using only the compressed air from the compressor 2 as an operating source. As shown in FIG. 4, the pneumatic reciprocating pump 15 includes a piston 27 in a cylinder 21A, and a piston rod 28 is a first one. 2 cylinders 21B. The water inflow port 25 and the discharge port 26 are formed on the tip side of the second cylinder 21B. A check valve 30 is provided at each of the inlet 25 and the outlet 26.

  The continuous reciprocation of the piston 27 of the pneumatic reciprocating pump 15 is detected by pressure detection type stroke end sensors 22 and 23 provided at the head side port and the rod side port of the cylinder 21A, respectively, and compressed by the flow path switching valve 24. The piston 27 is reciprocated by air flow path control. Further, by providing an air flow rate adjusting valve 29 at the rod side port of the cylinder 21A, the speed of the piston 27 is adjusted, and the water discharge amount of the pneumatic reciprocating pump 15 can be adjusted.

What is necessary is just to adjust the water discharge amount of the said pneumatic reciprocating pump 15 in the range of about 100-300cc per compressed air 1Nm < ³ > / min according to the dust generation amount by the difference in rock quality. In the case of this amount of water, no water droplets are felt even when the compressed air is touched, and dust can be prevented with a minimum amount of water. In addition, when the clay encounters viscous soil during drilling and the slime discharge becomes worse and the drilling is disturbed, the water discharge amount may be increased to promote the slime discharge. In FIG. 4, reference numeral 33 is a compressed air on / off valve, and reference numeral 34 is a line oiler. The line oiler 34 is used when a down-the-hole hammer is used.

  DESCRIPTION OF SYMBOLS 1 ... Perforator, 2 ... Compressor, 3 ... Branch part, 4 ... Atomizer, 5 ... Dust prevention device, 6 ... Water tank, 7 ... Air supply line, 8.9 ... Fluid hose, 10 ... Mount, 11 DESCRIPTION OF SYMBOLS ... Guide cell, 12 ... Drifter drill, 15 ... Pneumatic reciprocating pump 15, 19 ... Frame frame, 20 ... Air supply port (compressed air), 25 ... Inlet (water), 26 ... Discharge port (water), 22 23: Stroke end sensor, 24: Flow path switching valve, 29 ... Air flow rate adjustment valve

Claims (3)

A branch is provided in the compressed air supply line from the compressor to the perforator, and an atomizer is provided on the downstream side to make the water supplied to the supply line mist in the pipe.
Equipped with a pneumatic reciprocating pump, equipped with a dust prevention device capable of pumping water in the tank, connected to the air supply port of the pneumatic reciprocating pump and the branch portion, and the pneumatic reciprocating pump And a water supply port of the atomizer, and the pneumatic reciprocating pump is driven by using only compressed air from the compressor as an operating source.   A continuous reciprocating motion of a piston of the pneumatic reciprocating pump is detected by a pressure detection type stroke end sensor provided in a head side port and a rod side port of the cylinder, and the piston is reciprocated by controlling a flow path switching valve. Item 2. A dust prevention system for a drilling machine according to item 1.   The dust prevention system for a boring machine according to any one of claims 1 and 2, wherein the discharge amount of the pneumatic reciprocating pump is adjusted by an air flow rate adjusting valve provided at a rod side port of the cylinder.

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