JP3165975B2 - Drill rod clamp mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a drilling machine with a drilling rod, for example, an outer pipe drilling rod and an inner pipe drilling rod (hereinafter referred to as a double pipe rod) for a double pipe method. The present invention relates to a drill rod clamping mechanism for clamping a heavy pipe rod to a double pipe rod on a drilling machine side.

[0002]

2. Description of the Related Art In a drilling apparatus, a double pipe rod is used, and drilling is performed to a predetermined depth while successively adding. Conventionally, when performing drilling work by successively adding a double pipe rod to this drilling device, the outer pipe of the double pipe rod on the connected side is fixed with a hydraulic clamp using a hydraulic cylinder, The inner tube employs a method in which a wrench is inserted into a wrench flat portion provided on the outer periphery of the tube to hold the connected screw end surface of the outer tube and the wrench.

[0003]

However, when an operator inserts and removes an inner pipe excavating rod by using a spanner, the weight of the excavating rod is applied to the spanner itself, and a connection screw is required when adding the rod. Because of the make arp, it receives a large rotational force from the machine, and during the tube removal operation, it receives a large reverse rotational force from the machine to disconnect the connecting screw. It was dangerous work. Also, in the method of fixing the inner pipe excavating rod using a spanner, it is difficult to hold the inner pipe drilling rod at the center of rotation of the machine, which is inconvenient for screw connection work performed by the machine. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a drilling rod clamp mechanism capable of centering and clamping a drilling rod of a drilling device with a drilling center by remote control. Is what you do.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, the present invention relates to a drilling rod clamp device for gripping a rod to be added to a drilling device, wherein the clamp is provided at the tip of a cylinder tube of a cylinder. A piece, a cam connected to a cylinder tube of the cylinder, and a pin provided on a frame. Each of the pieces rotates opposite to each other, and a roller that follows the cam is provided at one end, and a clamp piece is provided at the other end. And a spring that indexes the clamp arm and always presses the roller against the guide surface of the cam. Further, the clamp piece of the clamp arm may be detachable, and the cam may have a guide surface having a divergent inclined surface and a vertical surface following the inclined surface.

[0005]

The clamp piece located at the end of the cylinder tube of the cylinder is advanced and retracted by the cylinder. Each of the two clamp arms can rotate opposite to each other about the pin. The cam connected to the cylinder tube of the cylinder moves forward and backward together with the clamp piece by the cylinder.

Since the roller provided at one end of the clamp arm is indexed by a spring and is always pressed against the guide surface of the cam, it follows the guide surface of the cam and thereby follows the other end of the clamp arm. Also operates following the movement of the cam.

That is, when the clamp piece provided at the tip of the cylinder tube is advanced by the cylinder, the cam also advances together therewith. Therefore, the roller provided at one end of the clamp arm presses and abuts the guide surface of the cam. The cam is rotated by the protruding cam, and the clamp piece provided at the other end grips the excavation rod. Therefore, the excavating rod is gripped and clamped in three directions by the clamp piece at the tip of the cylinder tube that has advanced and the clamp piece of the rotated clamp arm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a plan view showing an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a cylinder provided on a mounting plate 2, and a cylinder tube 5 has a clamp piece 3 attached thereto.
And cams 4 and 4 are provided. Therefore, the clamp piece 3 and the cam 4 are integrally advanced and retracted by the cylinder 1.
The clamp piece 3 is provided at the tip of the cylinder tube 5, and the cams 4, 4 are provided symmetrically via a cam bracket. The guide surfaces of the cams 4, 4 are inclined surfaces 4
a and a vertical surface 4b, the inclined surface 4a is formed symmetrically with the cams 4 and 4 in a divergent shape, and the vertical surface 4b is provided at a symmetric position.

Reference numerals 6 and 7 denote clamp arms, and pins 8
, And rotate in opposition about the pin 8. Clamp pieces 9 and 10 are provided on the front end facing surfaces of the clamp arms 6 and 7. The clamp pieces 9 and 10 grip the rod R in three directions with the clamp piece 3 provided at the tip of the cylinder tube 5. Therefore, although the clamp pieces 9 and 10 may be fixedly mounted on the clamp arm, it is more preferable that the clamp pieces 9 and 10 be detachably mounted because they can be replaced by the diameter of the rod R.

On the other end of the clamp arms 6 and 7, rollers 11 and 12 which follow the cams 4 and 4 are rotatably mounted. The rollers 11 and 12 are provided with springs 13 stretched between the ends of the clamp arms 6 and 7.
And is constantly pressed against the guide surfaces of the cams 4 and 4. Therefore, the rollers 11 and 12 are always
4 will be followed. The spring 13
Are stored in the case 14 in this example.

Then, the three clamp pieces 3, 6,
When the rod R is positioned substantially at the center of the cylinder 7 and the clamp piece 3 is advanced by the cylinder 1, the cams 4 and 4 are advanced together with the advance of the clamp piece 3. Then, the rollers 11 and 12 of the clamp arms 6 and 7 are indexed by the springs 13 and are constantly pressed against the guide surfaces of the cams 4 and 4, and are pushed by the guide surface by the advance of the cam. , 7 rotate oppositely about the respective pins 8, 8, and the clamp pieces 9, 10 at the tips press the rod R. Accordingly, the rod R is gripped and clamped in three directions by the clamp pieces 3 advanced by the cylinder 1 and the clamp pieces 9 and 10 advanced by the rotation of the clamp arms 6 and 7.

At this time, since the inclined surfaces 4a and the vertical surfaces 4b of the guide surfaces of the cams 4 and 4 are formed bilaterally symmetrically, the clamp pieces 9 and 10 of the clamp arms 6 and 7 rotate the rod R mechanically. At the time of the gripping position at the center position, the rollers 11, 12 ride on the vertical surfaces 4b, 4b from the inclined surfaces 4a, 4a of the cams 4, 4, and the clamp piece 3 at the tip of the cylinder tube 5 firmly presses and holds the excavating rod R. Therefore, even if the cylinder tube 5 is extended, the positions of the clamp arms 6 and 7 do not change, and the excavation rod R is always held at the center of the machine rotation.

The cams 4 and 4 are preferred examples.
The role can be achieved if at least a bilaterally symmetric and divergent inclined surface is formed and the vehicle has a riding portion that changes continuously from the inclined surface to the vertical surface, that is, a portion where snackover is performed. Not something.

FIG. 1 shows a state in which the rod R is gripped. In use, if the cams 4 and 4 are retracted by the cylinder 1, the clamp arms 6 and 7 are
Since one end is indexed, it rotates in the opposite direction to gripping, and the arms 6 and 7 are opened. It is natural that the rod R is positioned and clamped in this state.

In the above embodiment, the clamping of the rod R has been described. However, in the case of a double pipe rod composed of an outer pipe drilling rod and an inner pipe drilling rod, the clamp mechanism is arranged in parallel to connect the outer rod and the inner rod. What is necessary is just to hold and clamp. Further, the present invention may be applied to a drilling device or a rod handling device that supplies a double pipe rod to the drilling device, and may be applied to a wide range when a rod clamp is required. It is possible.

[0016]

As described above, according to the present invention, a drilling rod, for example, a double pipe rod, can be clamped at a position to be added to a drilling device. Simply by placing the double pipe rod to be added, it can be clamped and centered and set to the connection position. Therefore, it is possible to eliminate the trouble of the operator getting out of the vehicle to set up the double pipe rod to refill each time, and
Even heavy double tube rods can be easily connected and safe.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 3 Clamp piece 4 Cam 4a Inclined surface 4b Vertical surface 6,7 Clamp arm 9,10 Clamp piece 11,12 Roller 13 Spring

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21B 19/06 E21B 19/14-19/18

Claims (3)

(57) [Claims] 1. A drilling rod clamp device for gripping a rod to be added to a drilling device, comprising: a clamp piece provided at a tip of a cylinder tube of a cylinder; a cam connected to the cylinder tube of the cylinder; Two clamp arms, each of which rotates opposite to each other about a pin provided on a frame and has a roller provided at one end to follow the cam and a clamp piece at the other end, and a roller for indexing the clamp arm A spring for constantly pressing the cam against the guide surface of the cam; 2. The drill rod clamping mechanism according to claim 1, wherein the clamp piece of the clamp arm is detachable. 3. The excavating rod clamping mechanism according to claim 1, wherein the cam has a guide surface formed by a divergent inclined surface and a vertical surface following the inclined surface.