Single-pair clamp holder for drilling machine

Abstract

The invention relates to a single-pair clamp holder for a drilling machine, and belongs to the technical field of drilling machines. Comprising a hollow shell, two slips in pairs and an oil cylinder used for enabling the slips to move. The two slips are respectively a slip I and a slip II; a counter-pulling screw rod and a counter-pulling plate are also arranged; the two ends of the counter-pulling screw rod are fixedly connected with the counter-pulling plate and the second slip correspondingly, the first slip is located between the counter-pulling plate and the second slip, and the counter-pulling screw rod penetrates through the first slip; the oil cylinder is located between the reverse pulling plate and the first slip and can drive the first slip and the second slip to be close to or away from each other. According to the clamping device, driving of the two slips can be achieved through one oil cylinder, the structural space is saved, and the production cost is reduced. The drilling rod clamping device is reasonable in structure, convenient to control and capable of adaptively changing along with the position of a drilling rod, and safe and stable clamping of the drilling rod is guaranteed.

Description

Technical Field

[0001] The invention relates to a single pair of clamps for a drilling rig, belonging to the technical field of drilling rigs. Background Art

[0002] A drilling rig is a machine used for drilling and punching in engineering. For example, there are exploration drilling rigs, water well drilling rigs, etc. The power head on the drilling rig drives the drill rod to rotate, and the drilling is achieved through the drill rod. During use, the drill rod needs to be disassembled and replaced. Therefore, a clamp is usually set corresponding to the power head. After the drill rod is clamped by the clamp, the corresponding part of the power head rotates to realize the removal of the drill rod.

[0003] At present, there are problems with the structure of the clamping part of the commonly used clamps, for example, the clamping part is not firmly clamped, and the clamping part has a complex structure and occupies space. Summary of the invention

[0004] The purpose of the present invention is to provide a single pair of clamps for a drilling rig to solve the above technical problems.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A single pair of clamps for a drilling rig comprises a hollow shell, two pairs of slips and an oil cylinder for moving the slips; the two slips are slip 1 and slip 2 respectively; a back-pull screw and a back-pull plate are also provided; the two ends of the back-pull screw are respectively fixedly connected to the back-pull plate and slip 2, the slip 1 is located between the back-pull plate and slip 2 and the back-pull screw passes through the slip 1; the oil cylinder is located between the back-pull plate and slip 1, and can drive slip 1 and slip 2 to move closer to or away from each other.

[0006] The further improvement of the technical scheme is as follows: the back-pull screw is arranged through the first slip plate, and the first slip plate can slide on the back-pull screw; one end of the cylinder barrel of the oil cylinder is fixedly connected with the back-pull plate, and the telescopic rod of the oil cylinder is fixedly connected with the first slip plate; the clamping surface of the second slip plate is opposite to the clamping surface of the first slip plate.

[0007] A further improvement of the technical solution is that four counter-pull screws are provided.

[0008] A further improvement of the technical solution is that the clamping surfaces of slip 1 and slip 2 are arc-shaped.

[0009] A further improvement of the technical solution is that the clamping surfaces of slip 1 and slip 2 are detachably provided with clamping blocks.

[0010] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are as follows: The clamp of the present invention is provided with a back-pull plate and a back-pull screw, and the back-pull plate, slip 1 and slip 2 are connected to form a whole through the back-pull screw, and the oil cylinder is placed between the back-pull plate and slip 1, and then the linkage control of the two slips is realized by using an oil cylinder through the pulling action of the back-pull plate and the back-pull screw. The situation that the slip at one end over-extrudes the drill rod and damages the drill rod will not occur. Even if the relative position of the drill rod in the housing changes, for example, the drill rod is no longer in the small position, the clamp can also perform adaptive clamping.

[0011] The clamp of the present invention can realize the driving of two slips by using one oil cylinder, which not only saves the overall structural space, but also reduces the usage format of the oil cylinder, thereby reducing the production cost.

[0012] The present invention has a reasonable structure and is easy to control, and can adapt to changes in the position of the drill rod, thereby ensuring safe and stable clamping of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 It is a schematic diagram of the decomposition state of the present invention; Among them, 1. shell, 2. back-pull plate, 3. back-pull screw, 4. slip 1, 5. slip 2, 6. clamping block, 7. cylinder, 8. telescopic rod. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0015] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0016] The invention discloses a single pair of clamps for a drilling rig, which is installed on the drilling rig and is used for clamping a drill rod of the drilling rig so as to realize the disassembly and installation of the drill rod.

[0017] like Figure 1 , Figure 2As shown, the clamp includes a shell 1, a cava and an oil cylinder. The shell 1 is a hollow structure, and the shell 1 is used to support and install other components, and the clamp is installed on the drilling rig through the shell 1. A mounting plate is provided on one end face of the shell 1, and the clamp is installed on the drilling rig through the mounting plate and bolts. The cava is arranged in the internal space of the shell 1. The cava is arranged in pairs, and there are also two cava, namely cava 1 4 and cava 2 5. Cava 1 4 and cava 2 5 are arranged at a distance, and the clamping surfaces of cava 1 4 and cava 2 5 are opposite. The oil cylinder is used to drive cava 1 4 and cava 2 5 to move relative to each other, so as to achieve the clamping of the drill rod through the clamping surfaces of cava 1 4 and cava 2 5.

[0018] The clamp is also provided with a back-pull screw 3 and a back-pull plate 2. Threaded sections are provided at both ends of the back-pull screw 3, and both ends of the back-pull screw 3 are fixedly connected with the back-pull plate 2 and the slip 2 5 using nuts. Slip 1 4 is located between the back-pull plate 2 and the slip 2 5, and the back-pull screw 3 directly passes through slip 1 4. Slip 1 4 can slide on the back-pull screw 3.

[0019] The anti-pull plate 2, slip 1 4 and slip 2 5 are arranged at intervals in sequence. The clamping surface of slip 2 5 is opposite to the clamping surface of slip 1 4. The oil cylinder is arranged between the anti-pull plate 2 and slip 1 4. The two ends of the oil cylinder are respectively connected to the anti-pull plate 2 and slip 1 4. The oil cylinder can drive slip 1 4 and slip 2 5 to move closer to or away from each other by controlling the movement of the telescopic rod, thereby achieving the clamping and release of the drill pipe.

[0020] In the specific implementation, the preferred embodiment is that one end of the cylinder barrel 7 of the oil cylinder is fixedly connected to the anti-pull plate 2, and the end of the telescopic rod 8 of the oil cylinder is fixedly connected to the slip 4. In addition, one end of the cylinder barrel 7 of the oil cylinder can also be fixedly connected to the slip 4, and the end of the telescopic rod 8 of the oil cylinder can be fixedly connected to the anti-pull plate 2.

[0021] In the clamp, the back-pull screw 3 and the back-pull plate 2 cooperate to achieve the simultaneous driving of the slip 1 4 and the slip 2 5. In order to ensure smooth and stable driving movement, four back-pull screws 3 are usually provided, such as Figure 1 , Figure 2 As shown, four back-pull screws 3 are respectively located at the four corners of the back-pull plate 2, and are also located at the four corners of slip 1 4 and slip 2 5. When the oil cylinder is driven, the force is stable and the movement is smooth and stable.

[0022] The clamp of the present invention usually sets the clamping surface of slip 1 4 and slip 2 5 to an arc shape, which can better adapt to the cylindrical drill rod. Furthermore, the clamping block 6 is usually set in a detachable manner on the clamping surface of slip 1 4 and slip 2 5, and the clamping block 6 directly contacts the drill rod. The clamping block 6 is usually made of rubber. The inner side surface of the clamping block 6 is provided with some convex points or convex structures that can increase the friction force. The clamping block 6 can be replaced after being worn.

[0023] When the present invention is installed and used, the oil cylinder is connected to the hydraulic system of the drilling rig. When the telescopic rod of the oil cylinder is extended, it can directly drive the slip 1 4 to move in the direction close to the slip 2 5; at the same time, under the action of the interaction force, one end of the cylinder barrel 7 drives the anti-pull plate 2 to move in the direction away from the slip 2 5, and then, through the action of the anti-pull screw 3, pulls the slip 2 5 to move in the direction close to the slip 1 4; the slip 1 4 and the slip 2 5 are close to clamp the drill rod. When the telescopic rod is retracted, the movement mode of the slip 1 4, the slip 2 5 and the anti-pull plate 2 is opposite to the above, and the slip 1 4 and the slip 2 5 are away from the release of the drill rod.

[0024] In the structure where the cylinder barrel of the oil cylinder is connected to the back-pull plate, and the telescopic rod is connected to the slip 1, the ends of the cylinder barrel and the telescopic rod and the parts at the ends are in a non-fixed state. The most ideal state is that the cylinder barrel and the telescopic rod move relative to each other at the same time, so that slip 1 and slip 2 are close to or away from the drill rod at the same time, and finally clamp or release the drill rod at the same time. However, due to the moving characteristics of the cylinder barrel and the telescopic rod of the oil cylinder, in actual work, there will be a situation where slip 1 moves first and then slip 2. That is to say, when the oil cylinder is in motion, the telescopic rod moves first, and the telescopic rod drives slip 1 to move first (at this time, the cylinder barrel may move slightly, and then drive slip 2 to move slightly through the back-pull plate and the back-pull screw), and after slip 1 touches the drill rod, slip 1 will no longer move due to the blocking effect of the drill rod (at this time, the force of slip 1 on the drill rod is very small and will not damage the drill rod). Then, under the interaction, the cylinder starts to move greatly, and then drives the second slip to move slightly through the back-pull plate and the back-pull screw until the second slip also touches the drill pipe. Then, the first slip and the second slip clamp the drill pipe at the same time.

[0025] The clamp uses one oil cylinder to drive two slips, saving structural space and reducing production costs. The linkage control of the two slips is achieved by one oil cylinder, a back-pull plate and a back-pull screw, so that the slip at one end will not damage the drill rod due to excessive squeezing of the drill rod due to inadequate control. Moreover, even if the relative position of the drill rod in the shell changes, adaptive clamping can be performed. If two separate oil cylinders are used to push the slips, it is very easy for one of the oil cylinders to push the slips and contact the drill rod without stopping in time, causing damage to the drill rod. The technical solution realizes the linkage control of the two slips by one oil cylinder, a back-pull plate and a back-pull screw, which can ensure that there will be no damage to the drill rod due to excessive pushing.

[0026] The present invention has a reasonable structure and is easy to control, and can adapt to changes in the position of the drill rod, thereby ensuring safe and stable clamping of the drill rod, while also ensuring that no damage to the drilling vehicle caused by excessive pushing occurs.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A single pair of clamps for a drilling rig, characterized in that: The invention comprises a hollow shell (1), two pairs of slips and an oil cylinder for moving the slips; the two slips are slip 1 (4) and slip 2 (5); a back-pull screw rod (3) and a back-pull plate (2) are also provided; the two ends of the back-pull screw rod (3) are respectively fixedly connected to the back-pull plate (2) and slip 2 (5); the slip 1 (4) is located between the back-pull plate (2) and slip 2 (5) and the back-pull screw rod (3) passes through the slip 1 (4); the oil cylinder is located between the back-pull plate (2) and slip 1 (4) and can drive the slip 1 (4) and slip 2 (5) to move closer to or farther from each other.

2. A single pair of clamps for a drilling rig according to claim 1, characterized in that: The back-pull screw (3) is arranged through the slip 1 (4), and the slip 1 (4) can slide on the back-pull screw (3); one end of the cylinder barrel (7) of the oil cylinder is fixedly connected to the back-pull plate (2), and the telescopic rod (8) of the oil cylinder is fixedly connected to the slip 1 (4); the clamping surface of the slip 2 (5) is opposite to the clamping surface of the slip 1 (4).

3. A single pair of clamps for a drilling machine according to claim 1, characterized in that: Four back-pull screws (3) are provided.

4. A single pair of clamps for a drilling machine according to claim 1, characterized in that: The clamping surfaces of the first slip (4) and the second slip (5) are arc-shaped.

5. A single pair of clamps for a drilling machine according to claim 1, characterized in that: The clamping surfaces of the first slip (4) and the second slip (5) are detachably provided with clamping blocks (6).

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