JP2000054776A - Clamping device for drill rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a drill rod to be held appropriately by securely permitting a rod clamp to be in a half clamped state. SOLUTION: The drill rod loading device of a boring machine is equipped with a rod clamp for grasping a droll rod, and operates to move the drill rod from the withdrawal position to the boring axial line, a regulation cylinder 30 is connected to the close side conduit 22 of a clamp cylinder 16 for opening and closing the rod clamp to regulate the stroke of the clamp cylinder 16 during half clamping period, and a position adjustable stopper 32 is provided for setting the stroke of the regulation cylinder 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill rod for a drilling machine when drilling a long hole, such as when a long rock bolt is driven to reinforce rock on a wall in a tunnel drilling operation. The present invention relates to a drill rod clamping device for appropriately holding a drill rod in a drill rod mounting device for performing extension and recovery.

[0002]

2. Description of the Related Art In a drilling machine such as a drill jumbo or a fan cut drill, a shank rod 4 is inserted into a rock drill 3 mounted on a guide shell 2 as shown in FIGS. Drill rod 5 of predetermined length on rod 4
Are connected via a sleeve 6, a bit 7 is attached to the tip of the drill rod 5, and the tip of the drill rod 5 is supported by a centralizer 8 provided at the tip of the guide shell 2. At the time of drilling, the impact and the rotation are transmitted from the rock drill 3 via the drill rod 5 to the bit 7, and the rock drill 3 is fed. If the required drilling length is longer than the length of the drill rod 5, another drill rod 9 is added or collected during drilling work.

[0003] As a drill rod mounting device 10 for extending and recovering the drill rod 9, as shown in FIG. 6, a base 14 is fixed to a support frame 13 fixed to the side surface of the guide shell 2. An arm 12 having a rod clamp 11 for gripping the drill rod 9 is pivotally supported on the base 14 so that the drill rod 9 is moved from the retracted position onto the axis X of the drilling hole. .

When the drill rod 9 is extended by the drill rod mounting device 10, the following procedure is performed. First, the rock drill 3 is driven into the air, the screw at the connection between the shank rod 4 of the rock drill 3 and the sleeve 6 at the rear end of the drill rod 5 is loosened, the sleeve 6 is clamped with the centralizer 8, and the rock rock is drilled. The drill 3 is reversed, the screw at the connection between the shank rod 4 and the sleeve 6 of the drill rod 5 is cut off, and the rock drill 3 is moved backward on the guide shell 2.

In the retracted position, the drill rod mounting device 10 closes the rod clamp 11 with the clamp cylinder 16 to grip the drill rod 9, and then rotates the arm 12 with the swing cylinder 17 to remove the drill rod 9. It is moved from the retracted position in FIG. 6 to the hole axis X as shown in FIG.

When the drill rod 9 is positioned on the drill axis X, the rock drill 3 is moved forward while rotating forward to connect the shank rod 4 and the thread of the sleeve 19 at the rear end of the drill rod 9. Then, the clamp cylinder 16 is slightly contracted, and the rod clamp 11 is slightly opened as shown in FIG.
A half clamp state is provided in which the drill rod 9 is rotatable but is held so as not to fall off. The rock drill 3 is moved forward while rotating forward to connect the screw at the front end of the drill rod 9 with the screw of the sleeve 6 at the rear end of the existing drill rod 5.

After connecting the drill rod 9, the rod clamp 11 is fully opened as shown in FIG. 9, and the arm 12 is rotated to return to the retracted position. When drilling is performed again and a predetermined drilling length is reached, the drill rod 9 is collected. The collection of the drill rod 9 is performed in the following procedure.

[0008] After drilling with the rock drill 3 to loosen the screw at the connection portion of the drill rod 9, the rock drill 3 is retracted by the distance of the drill rod 9, and the rear end of the drill rod 5 in front of the rock drill 3. Is clamped by the centralizer 8.
Then, the arm 12 is rotated so that the rod clamp 11
And the clamp cylinder 16 is slightly extended to hold the drill rod 9 in a half-clamp state.

The rock drill 3 is retracted while rotating in the reverse direction. First, the screw at the front end of the drill rod 9 is cut off from the sleeve 6 at the rear end of the front drill rod 5. At a predetermined recovery position, the rock drill 3 stops retreating, the clamp cylinder 16 is extended, the rod clamp 11 is closed, and the drill rod 9 is gripped. Then, the rock drill 3 is moved backward while reversing again, and the shank rod 4 is moved to the sleeve 1 at the rear end of the drill rod 9.
Disconnect from 9. Thereafter, the arm 12 is rotated to move the drill rod 9 from the drill axis X to the retracted position, and the collection is completed.

Thus, the drill rod mounting device 10
It is necessary to hold the drill rod 9 with the rod clamp 11 in the half clamp state when adding or collecting the drill rod 9.

Conventionally, in the drill rod mounting apparatus 10, in order to hold the drill rod 9 with the rod clamp 11 in the half clamp state, the clamp cylinder 16 is reduced depending on the operator's intuition, or the drill rod 9 is separately provided.
Means such as providing a leaf spring or a coil spring have been used in order to hold the pressure.

[0012]

However, when the clamp cylinder is reduced by the operator's intuition, the rod clamp is opened too much, causing the drill rod to fall off, or the core between the front and rear drill rods to be out of order. Only connection and disconnection can be difficult.

Further, when a separate plate spring, coil spring, or the like is provided to hold the drill rod, the drill rod may fall off due to settling of the spring, or an excessive external force may be applied to the drill rod due to bending of the hole at the time of drilling. There has been a problem that when applied, the drill rod cannot be held due to insufficient spring force.

The present invention solves such a problem in a drill rod mounting device of a drilling machine. The present invention is directed to a drill rod clamp capable of properly holding a drill rod with a rod clamp 11 in a half clamp state. It is intended to provide a device.

[0015]

According to the present invention, there is provided a drill rod clamping apparatus including a rod clamp for gripping a drill rod, and a drill rod mounting apparatus for a drilling machine for moving the drill rod from a retracted position to a drill axis. In order to solve the above-mentioned problem, a restricting cylinder for restricting a stroke of the clamp cylinder at the time of the half clamp is connected to a clamp cylinder for opening and closing the rod clamp.

This drill rod clamping device restricts the stroke of the clamp cylinder by the restricting cylinder when the rod clamp needs to be in the half clamp state when the drill rod is extended or collected by the drill rod mounting device. By doing so, the rod clamp can be opened to a position where the drill rod can rotate but does not fall off, and the drill rod can be reliably held.

Further, by connecting the restricting cylinder to the closed-side conduit of the clamp cylinder and providing a stopper that can adjust the position for setting the stroke of the restricting cylinder, the degree of opening when the rod clamp is in the half clamp state can be adjusted. It can be adjusted arbitrarily.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a hydraulic circuit diagram showing the configuration of a drill rod clamping device according to an embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the operation of the drill rod clamping device. It is.

This drill rod clamping device can be mounted on a drill rod mounting device 10 as shown in FIG. 6 provided on the side surface of the guide shell 2 of the drilling machine as shown in FIGS.

The drilling machine is, as described above, a guide shell 2
Insert the shank rod 4 into the rock drill 3 mounted on the
A drill rod 5 of a predetermined length is connected to the shank rod 4 via a sleeve 6, a bit 7 is attached to a tip of the drill rod 5, and a tip of the drill rod 5 is provided by a centralizer 8 provided at a tip of the guide shell 2. Supports the department.
At the time of drilling, the impact and the rotation are transmitted from the rock drill 3 via the drill rod 5 to the bit 7, and the rock drill 3 is fed. If the required drilling length is longer than the length of the drill rod 5, another drill rod 9 is required for drilling work.
Are added and collected.

The drill rod mounting device 10 has a base 14 mounted on a support frame 13 fixed to the side surface of the guide shell 2.
And an arm 12 having a rod clamp 11 for gripping the drill rod 9 is pivotally supported on the base 14,
By rotating the arm 12 with the swing cylinder 17, the drill rod 9 is moved from the retracted position onto the hole axis X. The rod clamp 11 is opened and closed by expansion and contraction of the clamp cylinder 16.

The rod-side oil chamber 16A and the bottom-side oil chamber 16B of the clamp cylinder 16 are connected to the open-side pipe 21 and the closed-side pipe 2 from the cylinder port of the clamp on / off control valve 20.
2 are connected. The clamp on / off control valve 20 is a three-position electromagnetic switching valve. By switching the clamp on / off control valve 20, each of the oil chambers 16A and 16B is connected to the hydraulic pressure source 23 and the tank 24 via the clamp on / off control valve 20. The clamp cylinder 16 expands and contracts in communication.

The open-side pipe 21 and the closed-side pipe 22 are provided with a pilot-operated check valve 25 for preventing hydraulic oil from flowing out. A half clamp selection valve 26 is provided. The half-clamp selection valve 26 is a two-position electromagnetic switching valve, and the closed-side pipe line 22 is shut off by switching the half-clamp selection valve 26.

Further, a regulating cylinder 30 is connected via a regulating cylinder control valve 31 from a closed pipe 22 between the bottom oil chamber 16 B of the clamp cylinder 16 and the half clamp selection valve 26. When the regulating cylinder 30 is extended, its rod 30R comes into contact with the stopper 32 to regulate the stroke. Stopper 32
Are adjustable in position so that the stroke of the regulating cylinder 30 can be set arbitrarily.

The restricting cylinder control valve 31 is a two-position electromagnetic switching valve. In a normal position, the rod-side oil chamber 30 of the restricting cylinder 30 communicates with the closing-side conduit 22. When switched, the bottom-side oil chamber 30B is closed. It is designed to communicate with the side conduit 22.

The extension of the drill rod 9 by the drill rod mounting device 10 is performed in the following procedure. First, the rock drill 3 is driven into the air, the screw at the connection between the shank rod 4 of the rock drill 3 and the sleeve 6 at the rear end of the drill rod 5 is loosened, the sleeve 6 is clamped with the centralizer 8, and the rock rock is drilled. The drill 3 is reversed, the screw at the connection between the shank rod 4 and the sleeve 6 of the drill rod 5 is cut off, and the rock drill 3 is moved backward on the guide shell 2.

In the retracted position, the drill rod mounting device 10 closes the rod clamp 11 with the clamp cylinder 16 and grips the drill rod 9. At this time, by switching the clamp on / off control valve 20 to the position shown in FIG. 1, the operating oil flows from the closed-side conduit 22 into the bottom-side oil chamber 16 </ b> B of the clamp cylinder 16,
Is extended. At the same time, the operating oil also flows into the rod-side oil chamber 30 of the regulating cylinder 30, so that the regulating cylinder 30 is completely reduced.

Next, the arm 12 is moved by the swing cylinder 17.
To move the drill rod 9 from the retracted position in FIG. 6 to the drill axis X as shown in FIG. When the drill rod 9 is positioned on the drilling axis X, the rock drill 3 is moved forward while rotating forward to connect the screws of the shank rod 4 and the sleeve 19 at the rear end of the drill rod 9.

Then, the clamp cylinder 16 is slightly contracted, and the rod clamp 11 is slightly opened to be in a half clamp state as shown in FIG. At this time, as shown in FIG. 2, the half clamp selection valve 26, the regulating cylinder control valve 31, and the clamp opening / closing control valve 20 are switched. Then
Since the closed-side pipe line 22 is shut off by the half-clamp selection valve 26, the hydraulic oil flows from the open-side pipe line 21 to the clamp cylinder 16.
Flows into the rod-side oil chamber 16A of the clamp cylinder 1
6 and the oil chamber 1 on the bottom side of the clamp cylinder 16
The hydraulic oil flowing out of 6B flows into the bottom-side oil chamber 30B of the regulating cylinder 30 to extend the regulating cylinder 30.

The restricting cylinder 30 stops extending when the rod 30R comes into contact with the stopper 32, so that the contraction of the clamp cylinder 16 is restricted and the rod clamp 11 is stopped.
Is firmly held so that the drill rod 9 can rotate but does not fall off.

In this state, the rock drill 3 is advanced while rotating forward, and the screw at the front end of the drill rod 9 is connected to the screw of the sleeve 6 at the rear end of the existing drill rod 5. After connecting the drill rod 9, the rod clamp 11 is fully opened as shown in FIG. At this time, the half clamp selection valve 26 and the regulating cylinder control valve 31 are switched from the state of FIG. 2 to the position of FIG. Then, since the closed-side conduit 22 communicates with the tank 24, the clamp cylinder 16 is completely reduced without being restricted, and the rod clamp 11 is fully opened. Then, the arm 12 is rotated to return to the retracted position.

When drilling is performed again to reach a predetermined drilling length, the drill rod 9 is recovered. The collection of the drill rod 9 is performed in the following procedure. I made a blank hit with the rock drill 3,
After loosening the screw at the connection of the drill rod 9, the rock drill 3
Is retracted by the distance of the drill rod 9, and the sleeve 6 at the rear end of the front drill rod 5 is clamped by the centralizer 8. Then, the arm 12 is rotated to move the rod clamp 11 on the drill axis X, the clamp cylinder 16 is slightly extended, and the drill rod 9 is held in a half clamp state. In this case, the half clamp selection valve 26, the regulating cylinder control valve 31, and the clamp opening / closing control valve 20 may be switched as shown in FIG.

When the drill rod 9 is held in the half-clamp state, the rock drill 3 is retracted while rotating in the reverse direction. First, the screw at the front end of the drill rod 9 is cut off from the sleeve 6 at the rear end of the front drill rod 5.

At the predetermined recovery position, the rock drill 3 stops retreating, and the clamp cylinder 16 is extended to extend the rod clamp 1.
1 is closed and the drill rod 9 is gripped. At this time,
The half clamp selection valve 26, the regulating cylinder control valve 31, and the clamp opening / closing control valve 20 are switched as shown in FIG.

Then, the rock drill 3 is moved backward while reversing again, and the shank rod 4 is cut off from the sleeve 19 at the rear end of the drill rod 9. Thereafter, the arm 12 is rotated to move the drill rod 9 from the drill axis X to the retracted position, and the collection is completed.

In this drill rod clamping device, by adjusting the position of the stopper 32, the degree of opening of the rod clamp 11 when holding the drill rod 9 in the half-clamp state can be arbitrarily adjusted. Therefore, the drill rod 9 can be appropriately set so that the misalignment does not occur and the drill rod 9 does not fall off even when an external force is applied. Control cylinder 30 and stopper 3
2 is provided near the driver's seat,
It is convenient to adjust the degree of opening of the rod clamp 11 while performing the above operation.

The restricting cylinder 30 is connected to the open-side conduit 21.
May be connected. Although the half-clamp selection valve 26, the regulating cylinder control valve 31, and the clamp on / off control valve 20 are electromagnetic switching valves here, other types of switching valves such as a manual switching valve may be used.

Further, in the drill rod clamping device of the present invention, a rod clamp for gripping a drill rod other than a drill rod mounting device for rotating an arm as shown in FIG. It is also possible to equip the rod mounting device for moving the drill rod from the retracted position to the drill axis.

[0039]

As described above, according to the drill rod clamping apparatus of the present invention, the rod clamp can be reliably held in the half clamp state and the drill rod can be appropriately held.

Further, by connecting the restricting cylinder to the closed-side conduit of the clamp cylinder and providing a stopper capable of adjusting the stroke of the restricting cylinder, the degree of opening when the rod clamp is in the half clamp state is provided. It can be adjusted arbitrarily.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing a configuration of a drill rod clamping device according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of a clamp device for a drill rod.

FIG. 3 is an explanatory view of the operation of the drill rod clamping device.

FIG. 4 is a side view of the drilling machine.

FIG. 5 is a plan view of the drilling machine.

FIG. 6 is a front view of the drill rod mounting device.

FIG. 7 is an explanatory view of the operation of the drill rod mounting device.

FIG. 8 is an explanatory view of the operation of the drill rod mounting device.

FIG. 9 is an explanatory view of the operation of the drill rod mounting device.

[Explanation of symbols]

 2 Guide Shell 3 Rock Drill 4 Shank Rod 5 Drill Rod 6 Sleeve 9 Drill Rod 10 Drill Rod Mounting Device 11 Rod Clamp 12 Arm 16 Clamp Cylinder 17 Swing Cylinder 20 Clamp Open / Close Control Valve 21 Open Line 22 Closed Line 23 Hydraulic source 24 Tank 26 Half clamp selection valve 30 Restriction cylinder 31 Restriction cylinder control valve 32 Stopper

Claims (2)

[Claims] 1. A drill rod mounting device for a drilling machine which includes a rod clamp for gripping a drill rod and moves the drill rod from a retracted position to a drill axis. A clamping device for a drill rod, wherein a regulating cylinder for regulating a stroke of the clamping cylinder is connected. 2. A clamping device for a drill rod according to claim 1, wherein a restricting cylinder is connected to a closed-side conduit of the clamp cylinder, and a stopper capable of adjusting a position for setting a stroke of the restricting cylinder is provided. .