Thin-walled round tube connection device

Abstract

The present invention is a thin-walled circular tube connection device comprising: a threaded connection sleeve, a positioning pin, a threaded screw, a wedge-shaped block, a connecting shaft, an elastic claw, and a thin-walled circular tube. The thin-walled circular tube is connected to the connecting shaft by the friction force generated by the expansion of the elastic claw; the two wedge-shaped blocks are pushed toward each other by the threaded screw; as the two wedge-shaped blocks move, the inclined surfaces on their upper portions push the connecting shaft axially upward, while the lower end surfaces of the two wedge-shaped blocks are suspended on the boss of the connection sleeve; the upper portion of the connection sleeve is threaded to connect with other components, thereby achieving the connection between the thin-walled circular tube and the steel pipe.

Description

Technical Field

[0001] The present invention relates to the field of oil and natural gas drilling and coring operations, and more particularly to a connecting device for a thin-walled pipe of a natural gas hydrate rope coring tool and other steel pipes. Background Art

[0002] Rope-type thermal and pressure-retaining coring tools require thin-walled round tubes to be connected to other steel pipes. These connections require a certain level of strength, quick connection, easy disassembly, and reusability. Threaded connections are traditionally used, but threading thin-walled round tubes made of nonferrous metals and non-metallic materials is difficult. Threaded connections are time-consuming and labor-intensive, and may even prevent complete disassembly of the components. Thin-walled round tube connection devices meet these strength requirements, are easy to install and disassemble, and are reusable. Summary of the Invention

[0003] The present invention aims to provide a thin-walled round pipe connecting device to solve the shortcomings of threaded connections of thin-walled round pipes.

[0004] The present invention is achieved through the following technical solution: a thin-walled circular tube connection device includes a threaded sleeve, a positioning pin, a threaded screw, a wedge block, a connecting shaft, an elastic claw, and a thin-walled circular tube. The threaded screw is positioned on one wedge block by the positioning pin, and the other wedge block is threadedly connected to the screw. The two wedge blocks are installed in a window on the upper portion of the connecting shaft and suspended on the inner shoulder of the threaded sleeve. The thin-walled circular tube is connected to the lower end of the connecting shaft by an elastic claw.

[0005] Briefly describe the working principle of the thin-walled circular tube connection device: the connection of thin-walled circular tubes is the friction between the inner wall of the thin-walled circular tube and the contact surface of the elastic claw; this friction is generated by the relative movement of the conical surface at the lower end of the connecting shaft and the inner conical surface of the elastic claw; the movement of the connecting shaft is generated by the movement of the two wedge blocks, and after the movement, the lower end surfaces of the two wedge blocks are suspended on the upper end surface of the boss of the connecting sleeve; the upper part of the connecting sleeve can be connected to other components by threads.

[0006] The advantages of the present invention are simple structure, convenient installation and disassembly, and reusability. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic structural diagram of the thin-walled circular tube connecting device proposed in the present invention.

[0008] In the figure: 1. threaded connection sleeve, 2. positioning pin, 3. threaded screw, 4. wedge block, 5. connecting shaft, 6. elastic claw, 7. thin-walled round tube. DETAILED DESCRIPTION

[0009] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0010] Refer to the instruction manual Figure 1The thin-walled circular tube 7 connection device includes: a threaded sleeve 1, a positioning pin 2, a threaded screw 3, a wedge 4, a connecting shaft 5, an elastic claw 6, and a thin-walled circular tube 7. The connecting shaft 5, with two wedges 4 mounted on its upper end and the elastic claw 6 inserted into its lower end, is installed into the threaded sleeve 1. The boss on the connecting shaft 5 aligns with the boss notch of the threaded sleeve 1, and the circular hole of the threaded sleeve 1 automatically aligns with the threaded screw 3. Rotating the threaded screw 3 moves the two wedges 4, causing them to hang on the bosses of the threaded sleeve 1. The thin-walled circular tube 7 is inserted into the elastic claw 6, with the end face of the thin-walled circular tube 7 close to the lower end face of the threaded sleeve 1. Rotate the threaded screw 3 again, the two wedge blocks 4 move radially along the threaded connection sleeve 1, and the inclined surfaces of the two wedge blocks 4 push the connecting shaft 5 to move axially upward; the axial movement of the connecting shaft 5 causes the elastic claws 6 to exert positive pressure on the inner wall of the thin-walled circular tube 7, and the friction force generated by this positive pressure on the inner wall of the thin-walled circular tube 7 drives the thin-walled circular tube 7 to move axially, and the axial movement of the thin-walled circular tube 7 causes the end face of the thin-walled circular tube 7 to be pressed tightly against the end face of the threaded connection sleeve 1.

[0011] When disassembling, rotate the threaded screw 3 counterclockwise, the two wedge blocks 4 retract, and the connecting shaft 5 can be pulled out from the threaded connecting sleeve 1. Push the connecting shaft 5 to remove the elastic claw 6, and the connecting shaft 5 can be pulled out from the thin-walled round tube 7.

Claims

1. A thin-walled round tube connecting device, comprising a threaded connecting sleeve (1), a positioning pin (2), a threaded screw (3), a wedge block (4), a connecting shaft (5), an elastic claw (6), and a thin-walled round tube (7); characterized in that: The threaded screw (3) connects the two wedge blocks (4) and is positioned by the positioning pin (2); the thin-walled circular tube (7) is connected to the connecting shaft (5) by means of the friction resistance of the elastic claw (6); the two wedge blocks (4) in the upper window of the connecting shaft (5) are suspended on the inner shoulder of the threaded connecting sleeve (1); the upper end of the connecting shaft (5) is an unequal diameter cylinder and the lower end is conical; symmetrical bosses are designed on the shoulders of the unequal diameter cylinder; the upper end cylinder is designed with symmetrical wedge windows; the two wedge blocks (4) are right-angled trapezoids, a threaded hole is designed along the height of the right-angled trapezoid, and the other block is designed with a circular hole, and the threaded hole is designed in a direction perpendicular to the axis of the circular hole.

2. The thin-walled round tube connecting device according to claim 1, characterized in that: The threaded connection sleeve (1) is cylindrical, with a thread designed on the upper end, a boss designed on the inner wall of the middle part, and a notch designed on the boss; a symmetrical circular hole is designed in the middle of the upper concave groove formed by the boss.

3. The thin-walled round tube connecting device according to claim 1, characterized in that: The elastic claw (6) is cylindrical and petal-shaped, and has a conical inner surface at the lower end of the boss.

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