JP2003074286A - Rod clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate centering of a drill rod while suppressing the dislocation of a center position of the drill rod when clamped, caused by wear or the like of parts. SOLUTION: This rod clamping device is provided with a pair of teeth 24, 34 for clamping the drill rod of a drill; a large-diameter clamp cylinder 2 for taking precedence to move one tooth 24 and stopping it in a prescribed centering position; and a small-diameter clamp cylinder 3 for moving the other tooth 34 succeedingly to clamp the drill rod 5.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod clamping device for clamping a drill rod for a drilling machine. 2. Description of the Related Art A drilling machine is provided with a drilling machine mounted on a guide shell, a drill rod having a predetermined length is connected to the drilling machine, and a bit is attached to a tip of the drill rod. The drill and drill are transmitted from the rock drill through a drill rod to the bit, and fed to the rock drill to drill the rock. When drilling a long hole, the drill rods are sequentially connected as the drilling progresses, and when the drilling is completed, the drill rod is separated and collected. [0003] When connecting and disconnecting a drill rod, it is necessary to clamp the drill rod and loosen or tighten a screw at a connection portion. Therefore, the drilling machine is provided with a rod clamping device for clamping the drill rod. Conventionally, as shown in FIGS. 7 to 10, a rod clamp device includes 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. There is a type in which the rod holder 71 performs clamping and opening by linking with the clamp cylinder 73 through the intermediary of the clamp cylinder 73 and extending and contracting the clamp cylinder 73. [0004] However, since this rod clamp device uses a large number of wear parts such as the link 72, pins 75, 76, 77, and bush, the parts are not used for a long period of time. Drill rod 7 when worn and clamped
4 tends to be out of order. When connecting or disconnecting the drill rod 74, the drill rod 74
It is necessary to center and clamp the drill so that its center position coincides with the axis of the drilling hole. If the center position of the drill rod 74 at the time of clamping is out of order, an extra force is required and the working efficiency is reduced. The present invention solves the above-mentioned problem in the rod clamp device of a drilling machine, and has a simple structure and a small number of wear parts, and the misalignment of the core position of the drill rod at the time of clamping due to wear of the parts or the like. An object of the present invention is to provide a rod clamp device that is hardly generated and that facilitates centering of a drill rod. A rod clamping apparatus according to the present invention comprises a pair of teeth for clamping a drill rod of a drilling machine, and one of the teeth is moved before clamping the drill rod. This problem is solved by providing a large-diameter clamp cylinder for stopping the drill rod at a predetermined centering position and a small-diameter clamp cylinder for subsequently moving the other tooth and clamping the drill rod. When a drill rod is clamped by this rod clamp device, a large diameter clamp cylinder is first extended to move one tooth and stop at a predetermined centering position. Then, when the small-diameter clamp cylinder extends and moves the other tooth, the tooth comes into contact with the drill rod and presses the drill rod against the tooth that has already stopped at the centering position. It is clamped in a state that matches. At this time, the large-diameter clamp cylinder having a large pressing force stops one tooth at the centering position. There is no misalignment. 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, and FIG. 3 is a sectional view taken along line AA of FIG. FIGS. 4 to 6 are explanatory views of the operation of the rod clamp device. In this rod clamp device, a clamp base 1 is fixed to a tip end of a guide shell 10 of a drilling machine, and side plates 12 and 13 erected on the clamp base 1 are provided.
The large-diameter clamp cylinder 2 and the small-diameter clamp cylinder 3
Support plates 21 and 31 are attached with bolts 22 and 32. 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 2 has a large-diameter clamp rod 23 and a small-diameter clamp cylinder 3 with a large-diameter clamp rod 33. Tooth 24, 34 for clamping drill rod 5 by extension of diameter clamp cylinder 2 and small diameter clamp cylinder 3
Is attached. The extension port 26 of the large-diameter clamp cylinder 2
Is connected to the extension pipe 6, and the reduction port 27 is connected to the reduction pipe 7. The extension pipe 36 is connected to the extension port 36 of the small diameter clamp cylinder 3 via the orifice 8, and the reduction port 7 is connected to the reduction port 27 via the orifice 8. The large-diameter clamp cylinder 2 is positioned and attached such that the tooth 24 reaches a predetermined centering position when the cylinder rod 23 extends to the stroke end. This mounting position is determined by the side plate 12 and the support plate 21.
Is adjusted by inserting a shim 28 between them. With this rod clamping device, a drill rod 5
Is clamped, the working fluid is supplied to the extension pipe 6 in the state of 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.
As shown in FIG. 5, first, the large-diameter clamp cylinder 2 starts the extension operation to move 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 thereafter stops at this position. Thereafter, the small-diameter clamp cylinder 3 starts to extend and moves the tooth 34, and as shown in FIG. 6, the tooth 34 comes into contact with the drill rod 5 and moves to the tooth 24 already stopped at the centering position. Since the drill rod 5 is pressed, the drill rod 5 is clamped in a state where the core position is aligned 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 at 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 clamp cylinder 3 having a small pressing force. It is possible to clamp the drill rod 5 so that the center position of the drill rod 5 coincides with the axis of the drilling hole without any deviation. Therefore, the centering of the drill rod is extremely easily performed, and the work time for connecting and disconnecting the drill rod 74 can be reduced. When releasing the clamp, the reduction pipe 7
Supply working fluid. 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 regulated by the orifice 8, so that the large-diameter clamp cylinder 2 first starts the reduction operation. When the cylinder rod 23 of the large diameter clamp cylinder 2 contracts to the stroke end, the small diameter clamp cylinder 3 contracts and the clamp is released. This rod clamp device has a simple structure and has few wear parts, and even if used for a long period of time, the core position of the drill rod 5 at the time of clamping due to wear of the parts is unlikely to be out of order. The rod clamp device of the present invention has a simple structure, has few components, does not easily cause the rod to be out of alignment at the time of clamping due to abrasion of the components, and facilitates the centering of the rod. Yes, work efficiency and safety are improved.

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 sectional view taken along line AA of FIG. 1; 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 conventional rod clamp device in a clamped state. FIG. 10 is a side view of a conventional rod clamp device in a clamped state. [Description of Signs] 1 Clamp Base 2 Large Diameter Clamp Cylinder 3 Small Diameter Clamp Cylinder 5 Drill Rod 6 Extension Pipe 7 Reduction Pipe 8 Orifice 10 Guide Shell 23 Cylinder Rod 24 Tooth 28 Shim 33 Cylinder Rod 34 Tooth

Claims (1)

Claims: 1. A pair of teeth for clamping a drill rod of a drilling machine, and one of the teeth is moved in advance and stopped at a predetermined centering position when clamping the drill rod. A rod clamping device including a large-diameter clamp cylinder and a small-diameter clamp cylinder that subsequently moves the other tooth to clamp a drill rod.