JP4776828B2 - Rod clamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rod clamp device for clamping a drill rod for a drilling machine.
[0002]
[Prior art]
The drilling machine is equipped with a drilling machine mounted on a guide shell, a drill rod of a predetermined length is connected to this drilling machine, a bit is attached to the tip of the drill rod, and the drilling machine is connected via a drill rod. In addition to transmitting the blow and rotation to the bit, it feeds the rock drill and drills it in the rock. When drilling long holes, the drill rods are sequentially connected as the drill holes progress, and when the drill holes are finished, the drill rods are separated and collected.
[0003]
When connecting or disconnecting the drill rod, it is necessary to clamp the drill rod and loosen or tighten the screw of the connecting portion. Therefore, the drilling machine is provided with a rod clamp device for clamping the drill rod.
Conventionally, as shown in FIGS. 7 to 10, a rod clamp device has a pair of left and right rod holders 71 pivotally supported on a guide shell 70 so as to be horizontally rotatable, and a link 72 pivotally supported so as to be vertically rotatable. In some cases, the rod holder 71 is clamped and released by being linked to the clamp cylinder 73 and extending and contracting the clamp cylinder 73.
[0004]
[Problems to be solved by the invention]
However, since this rod clamp device uses a large number of wear parts such as links 72, pins 75, 76, 77, bushes, etc., the parts are worn by long-term use, and the core position of the drill rod 74 at the time of clamping. It is easy to be crazy.
When connecting or disconnecting the drill rod 74, it is necessary to center and clamp the drill rod 74 so that its core position coincides with the hole axis, and the core position of the drill rod 74 at the time of clamping is If it goes crazy, extra power is required and work efficiency decreases.
[0005]
The present invention solves the above-mentioned problem in the rod clamp device of a drilling machine, has a simple structure and has few wear parts, and it is difficult to cause misalignment of the core position of the drill rod during clamping due to wear of parts, It is an object of the present invention to provide a rod clamp device that can easily center a drill rod.
[0006]
[Means for Solving the Problems]
The rod clamp device of the present invention includes a pair of teeth that clamp a drill rod of a drilling machine, and a large-diameter clamp that moves one of the teeth in advance and stops at a predetermined centering position when clamping the drill rod. The above-mentioned problem is solved by providing a cylinder and a small-diameter clamp cylinder that subsequently moves the other tooth to clamp the drill rod.
[0007]
When the drill rod is clamped by this rod clamp device, the large-diameter clamp cylinder is first extended to move one tooth and stop it at a predetermined centering position. After that, when the small-diameter clamp cylinder is extended and the other tooth is moved, the tooth abuts the drill rod and presses the drill rod against the tooth that has already stopped at the centering position, so the drill rod is positioned at the hole axis. Is clamped in accordance with
[0008]
At this time, the large-diameter clamp cylinder with a large pressing force stops one tooth at the centering position, so even if the other tooth is pressed against the drill rod with a small-diameter clamp cylinder with a small pressing force, the centering position is incorrect. There is nothing.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 is a plan view of a rod clamp device according to an embodiment of the present invention, FIG. 2 is a side view of the rod clamp device, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIGS. It is explanatory drawing of operation | movement of an apparatus.
In this rod clamp device, a clamp base 1 is fixed to the tip of a guide shell 10 of a drilling machine, and a large-diameter clamp cylinder 2 and a small-diameter clamp are mounted on side plates 12 and 13 erected on the clamp base 1. Support plates 21 and 31 of the cylinder 3 are attached with bolts 22 and 32.
[0010]
The large-diameter clamp cylinder 2 and the small-diameter clamp cylinder 3 are arranged so as to face each other, and a large-diameter clamp cylinder is provided at the tip of the cylinder rod 23 of the large-diameter clamp cylinder 2 and the tip of the cylinder rod 33 of the small-diameter clamp cylinder 3. 2 and the teeth 24 and 34 which clamp the drill rod 5 by the expansion | extension of the small diameter clamp cylinder 3 are attached.
[0011]
The extension pipe 6 is connected to the extension port 26 of the large-diameter clamp cylinder 2, and the reduction pipe 7 is connected to the reduction port 27. Further, the expansion pipe 6 is connected to the extension port 36 of the small-diameter clamp cylinder 3 through the orifice 8, and the reduction pipe 7 is connected to the reduction port 27 through the orifice 8.
The large-diameter clamp cylinder 2 is positioned and attached so that when the cylinder rod 23 extends to the stroke end, the tooth 24 reaches a predetermined centering position. This attachment position is adjusted by inserting a shim 28 between the side plate 12 and the support plate 21.
[0012]
When the drill rod 5 is clamped by this rod clamp device, the working fluid is supplied to the extension pipe 6 in the state shown in FIG. When the working fluid is supplied to the extension pipe 6, the supply of the working fluid to the extension port 36 side of the small-diameter clamp cylinder 3 is regulated by the orifice 8, so as shown in FIG. Starts the extension operation and moves the tooth 24. When the cylinder rod 23 of the large-diameter clamp cylinder 2 extends to the stroke end, the tooth 24 reaches a predetermined centering position and then stops at this position.
[0013]
Thereafter, the small-diameter clamp cylinder 3 starts to extend and moves the tooth 34. As shown in FIG. 6, the tooth 34 comes into contact with the drill rod 5, and the tooth 24 already stopped at the centering position is moved to the drill rod 5. As a result, the drill rod 5 is clamped in a state where the core position coincides with the hole axis.
At this time, since the working fluid acts on the large-diameter clamp cylinder 2 and the small-diameter clamp cylinder 3 with the same pressure, the large-diameter clamp cylinder 2 having a larger cylinder diameter has a larger pressing force than the small-diameter clamp cylinder 3. As described above, since the large diameter clamp cylinder 2 having a large pressing force stops the tooth 24 at the centering position, the centering position is maintained even when the tooth 34 is pressed against the drill rod 5 by the small diameter clamping cylinder 3 having a small pressing force. The drill rod 5 can be clamped so that the center position of the drill rod 5 coincides with the hole axis line. Therefore, the centering of the drill rod can be performed very easily, and the work time for connecting and disconnecting the drill rod 74 can be shortened.
[0014]
When releasing the clamp, the working fluid is supplied to the reduction pipe 7. When the working fluid is supplied to the reduction pipe 7, the supply of the working fluid to the reduction port 37 side of the small diameter clamp cylinder 3 is restricted by the orifice 8, so that the large diameter clamp cylinder 2 starts the reduction operation first. When the cylinder rod 23 of the large diameter clamp cylinder 2 is reduced to the stroke end, the small diameter clamp cylinder 3 is reduced and the clamp is released.
[0015]
This rod clamp device is simple in structure and has few wear parts, and even if it is used for a long period of time, the center position of the drill rod 5 at the time of clamping due to wear of parts or the like hardly occurs.
[0016]
【The invention's effect】
The rod clamp device of the present invention has a simple structure and few components, and the center of the rod is less likely to be misaligned during clamping due to wear of parts, etc., the rod can be easily centered, and the work efficiency and safety are low. improves.
[Brief description of the drawings]
FIG. 1 is a plan view of a rod clamp device according to an embodiment of the present invention.
FIG. 2 is a side view of the rod clamp device.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an explanatory view of the operation of the rod clamp device.
FIG. 5 is an explanatory view of the operation of the rod clamp device.
FIG. 6 is an explanatory view of the operation of the rod clamp device.
FIG. 7 is a plan view of a conventional rod clamp device in an open state.
FIG. 8 is a side view of a conventional rod clamp device in an open state.
FIG. 9 is a plan view of a clamped state of a conventional rod clamp device.
FIG. 10 is a side view of a clamp state of a conventional rod clamp device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clamp base 2 Large diameter clamp cylinder 3 Small diameter clamp cylinder 5 Drill rod 6 Extension pipe line 7 Reduction pipe line 8 Orifice 10 Guide shell 23 Cylinder rod 24 Tooth 28 Shim 33 Cylinder rod 34 Tooth

Claims (1)

A pair of teeth that clamp the drill rod of the drilling machine, a large-diameter clamp cylinder that moves one tooth in advance and stops it at a predetermined centering position when clamping the drill rod, and then the other A rod clamp device comprising a small-diameter clamp cylinder that moves a tooth and clamps a drill rod.

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