Lengthening rod assembly

Abstract

The utility model relates to the technical field of coal mine drilling machines, in particular to an extension bar assembly which comprises a steel pipe body, an outer threaded pipe is fixedly arranged at one end of the steel pipe body, threads matched with the outer threaded pipe are arranged on the inner edge of the other end of the steel pipe body, and two rotating rods are symmetrically arranged on the two sides in the outer threaded pipe. One ends of the two rotating rods extend out of the outer threaded pipe and are rotationally connected with the steel pipe body through rotating shafts, clamping blocks are fixedly arranged on the sides, away from the ends, located in the outer threaded pipe, of the two rotating rods, clamping grooves matched with the clamping blocks are formed in the inner pipe wall of the outer threaded pipe, and a spring is fixedly arranged between the rotating rods. And unlocking mechanisms are arranged on the sides, deviating from each other, of the two rotating rods. According to the utility model, the steel pipe extension bar can be prevented from loosening, and the installation reliability of the drill pipe extension bar is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine drilling machines, in particular to an extension rod assembly. Background Art

[0002] Drill pipe is a steel pipe with a groove at the tail end, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the well. The purpose of the drill pipe is to transport drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit. The drill pipe must be able to withstand huge internal and external pressure, twisting, bending and vibration. In the process of oil and gas extraction and refining, the drill pipe can be used many times. During the use of the drill pipe, drill pipe joints are needed to connect multiple drill pipes together to achieve deep drilling operations.

[0003] In the prior art, after the extension rods are connected, they are easily loosened and fall off during rotation because they are connected by threads, which has low reliability and is inconvenient to lock the extension rods. Therefore, we have introduced an extension rod assembly. Utility Model Content

[0004] The utility model aims to provide an extension rod assembly, which can prevent the steel pipe extension rod from loosening, improve the reliability of the installation of the drill rod extension rod, and solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An extension rod assembly comprises a steel pipe body, one end of which is fixedly provided with an externally threaded pipe, the inner edge of the other end of the steel pipe body is provided with a thread matching the externally threaded pipe, two rotating rods are symmetrically provided on both sides of the externally threaded pipe, one end of the two rotating rods extends outside the externally threaded pipe and is rotatably connected to the steel pipe body through a rotating shaft, a clamping block is fixedly provided on the opposite side of one end of the two rotating rods located in the externally threaded pipe, a clamping groove matching the clamping block is provided on the inner wall of the externally threaded pipe, a spring is fixedly provided between the rotating rods, and an unlocking mechanism is provided on the opposite sides of the two rotating rods.

[0007] Preferably, the unlocking mechanism includes a push block, a groove is provided on the inner wall of the steel pipe body corresponding to the position of the two rotating rods, a through hole is provided at the bottom of the groove, the push block is arranged in the groove, push rods are fixedly provided on the opposite sides of the two push blocks, and the other end of the push rod is fixedly connected to the rotating rod.

[0008] Preferably, the bottom of the groove is provided with a first chamfer, and the side wall of the push block is provided with a second chamfer matching the first chamfer.

[0009] Preferably, a sealing ring is provided on the first chamfer.

[0010] Preferably, the sealing ring is configured as a corrosion-resistant rubber ring.

[0011] Preferably, a slope is provided on one side of the block.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The extension rod assembly connects the external threaded tube of the steel tube body with the inner thread of another steel tube body through a steel tube body, a push block, an external threaded tube, a spring, a rotating shaft, a push rod, a rotating rod, a clamping block and a sealing ring. When the external threaded tube is screwed in, the rotating rod enters the external threaded tube, and the external threaded tube pushes the clamping block through an inclined surface. The clamping block drives the rotating rod to rotate and squeezes the spring at the same time. When the clamping block corresponds to the position of the clamping slot, the spring pushes the rotating rod and drives the clamping block to be clamped into the clamping slot. At this time, the clamping block can lock the external threaded tube, thereby preventing the steel tube extension rod from loosening and improving the reliability of the installation of the drill rod extension rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the structure of an extension rod assembly.

[0015] Figure 2 The figure is a schematic diagram of the internal structure of an extension rod assembly.

[0016] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the figure.

[0017] In the figure: 1. Steel pipe body; 2. Push block; 3. Externally threaded pipe; 4. Spring; 5. Rotating shaft; 6. Push rod; 7. Rotating rod; 8. Block; 9. Sealing ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figures 1 to 3 , the utility model provides a technical solution:

[0020] An extension rod assembly includes a steel pipe body 1, one end of which is fixedly provided with an externally threaded pipe 3, the inner edge of the other end of the steel pipe body 1 is provided with a thread matching the externally threaded pipe 3, two rotating rods 7 are symmetrically provided on both sides of the externally threaded pipe 3, one end of the two rotating rods 7 extends to the outside of the externally threaded pipe 3 and is rotatably connected to the steel pipe body 1 through a rotating shaft 5, a clamping block 8 is fixedly provided on the opposite side of one end of the two rotating rods 7 located in the externally threaded pipe 3, a clamping groove matching the clamping block 8 is provided on the inner wall of the externally threaded pipe 3, a spring 4 is fixedly provided between the rotating rods 7, and an unlocking mechanism is provided on the opposite sides of the two rotating rods 7.

[0021] The unlocking mechanism includes a push block 2. A groove is opened at the inner wall of the steel pipe body 1 corresponding to the position of the two rotating rods 7. A through hole is opened at the bottom of the groove. The push block 2 is arranged in the groove. Push rods 6 are fixedly provided on the opposite sides of the two push blocks 2. The other end of the push rod 6 is fixedly connected to the rotating rod 7.

[0022] The bottom of the groove is provided with a first chamfer, and the side wall of the push block 2 is provided with a second chamfer matching the first chamfer.

[0023] A sealing ring 9 is provided on the first chamfer, and the sealing ring 9 improves the sealing performance of the push block 2 .

[0024] The sealing ring 9 is configured as a corrosion-resistant rubber ring, which has a long service life.

[0025] One side of the card block 8 is provided with an inclined surface, which facilitates the card block 8 to be inserted into the card slot.

[0026] The external threaded tube 3 of the steel tube body 1 is connected with the inner thread of another steel tube body 1. When the external threaded tube 3 is screwed in, the rotating rod 7 enters the external threaded tube 3. The external threaded tube 3 pushes the clamping block 8 through the inclined surface. The clamping block 8 drives the rotating rod 7 to rotate while squeezing the spring 4. When the clamping block 8 corresponds to the position of the clamping slot, the spring 4 pushes the rotating rod 7 and drives the clamping block 8 to be clamped into the clamping slot. At this time, the clamping block 8 can lock the external threaded tube 3 to prevent the steel tube extension rod from loosening, thereby improving the reliability of the installation of the drill pipe extension rod.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extension rod assembly, comprising a steel tube body (1), characterized in that: An externally threaded tube (3) is fixedly provided at one end of the steel tube body (1), and a thread matching the externally threaded tube (3) is provided at the inner edge of the other end of the steel tube body (1). Two rotating rods (7) are symmetrically provided on both sides of the externally threaded tube (3), one end of the two rotating rods (7) extends outside the externally threaded tube (3) and is rotatably connected to the steel tube body (1) via a rotating shaft (5). A clamping block (8) is fixedly provided on the opposite side of one end of the two rotating rods (7) located in the externally threaded tube (3), and a clamping groove matching the clamping block (8) is provided on the inner tube wall of the externally threaded tube (3). A spring (4) is fixedly provided between the rotating rods (7), and an unlocking mechanism is provided on the opposite sides of the two rotating rods (7).

2. An extension rod assembly according to claim 1, characterized in that: The unlocking mechanism comprises a push block (2), a groove is provided at the inner wall of the steel pipe body (1) at the position corresponding to the two rotating rods (7), a through hole is provided at the bottom of the groove, the push block (2) is arranged in the groove, and push rods (6) are fixedly provided on opposite sides of the two push blocks (2), and the other end of the push rod (6) is fixedly connected to the rotating rod (7).

3. The extension rod assembly according to claim 2, characterized in that: The bottom of the groove is provided with a first chamfer, and the side wall of the push block (2) is provided with a second chamfer matching the first chamfer.

4. The extension rod assembly according to claim 3, characterized in that: A sealing ring (9) is provided on the first chamfer.

5. The extension rod assembly according to claim 4, characterized in that: The sealing ring (9) is configured as a corrosion-resistant rubber ring.

6. The extension rod assembly according to claim 1, characterized in that: One side of the clamping block (8) is provided with an inclined surface.

Images