JP2000054775A - Drill rod loading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a drill rod to be held appropriately by permitting positively a rod clamp to be in a half clamped state as required. 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, wherein it is made into a two-step cylinder provided with a half clamping piston 31 enabling a half- clamp to be done by a predetermined stroke with regard to a clamp cylinder 16 for opening and closing the rod clamp and a completely opening and closing piston 21.

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 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
The arm 12 is rotated to move the drill rod 9 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. 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. 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, and can securely hold a drill rod in a half clamp state as required. An object is to provide a drill rod mounting device.

[0015]

According to the present invention, there is provided 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. The above problem is solved by using a multi-stage cylinder capable of performing half clamping with a predetermined stroke.

In the drill rod mounting apparatus, when the rod clamp needs to be in the half clamp state when performing the extension or collection of the drill rod, the rod clamp is operated by a predetermined stroke so that the rod clamp is drilled. The rod can be opened to a position where the rod is rotatable but does not fall off, and the drill rod can be properly held.

[0017]

FIG. 1 is a structural view of a clamp cylinder of a drill rod mounting apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views of the operation of the clamp cylinder of the drill rod mounting apparatus. It is.

The basic configuration of this drill rod mounting device is the same as that shown in FIG. 6, and is provided on the side surface of the guide shell 2 of the drilling machine shown in FIGS. As described above, the drilling machine inserts the shank rod 4 into the rock drill 3 mounted on the guide shell 2, connects the drill rod 5 of a predetermined length to the shank rod 4 via the sleeve 6, and performs drilling. A bit 7 is attached to the tip of the 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.

The drill rod mounting device 10 has a base 14 mounted on a support frame 13 fixed on 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 opens and closes due to expansion and contraction of the clamp cylinder 16.

As shown in FIG. 1, the clamp cylinder 16 is a two-stage cylinder including a full-open / close piston 21 and a half-clamp piston 31. The rod-side oil chamber and the head-side oil chamber of the full opening / closing piston 21 include:
An open-side pipe 22 and a closed-side pipe 23 are connected from a cylinder port of the clamp on / off control valve 20. The clamp on / off control valve 20 is a three-position electromagnetic switching valve. By switching the clamp on / off control valve 20, each oil chamber of the full on / off piston 21 is connected to the hydraulic source 25 and the tank via the clamp on / off control valve 20. 26 and the piston 2 for full opening and closing
1 expands and contracts.

A half-clamp control valve 30 is provided between the rod-side oil chamber and the head-side oil chamber of the half-clamping piston 31.
The open-side conduit 32 and the closed-side conduit 33 are connected from the cylinder ports of the first and second cylinders. The half-clamp control valve 30 is a three-position electromagnetic switching valve. By switching the half-clamp control valve 30, each oil chamber of the half-clamp piston 31 is connected to the hydraulic source 25 through the half-clamp control valve 30.
Clamping piston 3 communicating with the tank 26
1 expands and contracts.

The clamp on / off control valve 20 and the half clamp control valve 30 can be controlled independently of each other.
Therefore, the full open / close piston 21 and the half clamp piston 31 can be extended and contracted independently of each other.

As shown in FIG. 1, the clamp cylinder 16 comprises a full opening / closing piston 21 and a half clamp piston 3.
In a state where both the rods 1 and 2 are extended, the rod clamp 11 can be closed and the drill rod 9 can be gripped as shown in FIG.

In this state, when the half clamp control valve 30 is switched as shown in FIG. 2 to reduce only the half clamp piston 31, the rod clamp 11 is slightly opened as shown in FIG. The stroke is set so that the drill rod 9 is rotatable but can be properly held so as not to fall off. Therefore,
The rod clamp 11 can be reliably brought into the half clamp state.

From the half clamp state, the clamp opening / closing control valve 20 is switched as shown in FIG.
When the rod clamp 11 is also reduced, the rod clamp 11 is fully opened as shown in FIG.

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 open / close control valve 20 and the half clamp control valve 30 to the positions shown in FIG.
The hydraulic oil flows into the head-side oil chamber of the half-clamping piston 31 from the closing-side pipe 33, and the hydraulic oil flows from the closing-side pipe 33 into the head-side oil chamber of the half-clamping piston 31. The piston 31 is extended together.

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 half-clamp control valve 30 is switched to the position shown in FIG. 2, and the operating oil flows into the rod-side oil chamber of the half-clamping piston 31 from the open-side pipe 32 to reduce the half-clamping piston 31. The rod clamp 11 is slightly opened to be in a half clamp state as shown in FIG. The rod clamp 11 holds the drill rod 9 so that it 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 clamp on / off control valve 2 is changed from the state shown in FIG.
0 is switched to the position of FIG. Then piston 2 for full opening and closing
Hydraulic oil flows into the first rod-side oil chamber from the open-side conduit 22 and the fully open / close piston 21 contracts, and the rod clamp 11 is fully opened as shown in FIG. Then, 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 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 clamp 12 is rotated to move the rod clamp 11 on the drill axis X, and the clamp open / close control valve 20 and the half clamp control valve 30 are switched to the positions shown in FIG. The drill rod 9 is held as a state.

In this 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, and the clamp opening / closing control valve 2
By switching 0 and the half clamp control valve 30 to the position shown in FIG. 1, the rod clamp 11 is closed and the drill rod 9 is gripped.

Then, the rock drill 3 is moved backward while reversing again to separate the shank rod 4 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 mounting device, the clamp cylinder 16 is a two-stage cylinder having a full opening / closing piston 21 and a half clamping piston 31. Since the rod clamp 11 can be extended and contracted independently of each other, the rod clamp 11 is securely placed in the half clamp state so that the drill rod 9 has an appropriate play and does not cause misalignment.
In addition, it is possible to appropriately hold so as not to fall off even when an external force is applied.

Although the electromagnetic switching valve is used for the clamp on / off control valve 20 and the half clamp control valve 30 here, other types of switching valves such as a manual switching valve may be used.

Further, the drill rod mounting 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. 6 is moved by another means such as a parallel slide onto the axis of a drilled hole from a retracted position. You can also.

[0037]

As described above, according to the drill rod mounting apparatus of the present invention, the rod clamp can be securely held in the half-clamp state as required, and the drill rod can be appropriately held.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a clamp cylinder of a drill rod mounting device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of a clamp cylinder of the drill rod mounting device.

FIG. 3 is an explanatory view of an operation of a clamp cylinder of the drill rod mounting 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 Attachment Device 11 Rod Clamp 12 Arm 16 Clamp Cylinder 17 Swing Cylinder 20 Clamp Open / Close Control Valve 21 Full Opening Piston 22 Open Side Pipe 23 Closed side line 25 Hydraulic source 26 Tank 30 Half clamp control valve 31 Piston for half clamp 32 Open side line 33 Closed side line

Claims (1)

[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 an axis of the drilling drill. A drill rod mounting device characterized by a multi-stage cylinder capable of half-clamping by stroke.