CN215672085U

CN215672085U - Back-up tong jaw structure

Info

Publication number: CN215672085U
Application number: CN202120999698.8U
Authority: CN
Inventors: 张云玲; 王章立; 胡钟歌
Original assignee: Shanghai Lingang Emerging Industry Enterprise Service Co ltd; Shanghai Jian Qiao University
Current assignee: Shanghai Lingang Emerging Industry Enterprise Service Co ltd; Shanghai Jian Qiao University
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2022-01-28
Anticipated expiration: 2031-05-11

Abstract

The utility model relates to a back-up tong tooth structure, which comprises a main body (1), and a clamping part (2) and a fixing part (3) which are arranged on two sides of the main body (1), wherein the clamping part (2) is provided with a concave-convex structure and used for clamping a connecting pipe, and the fixing part (3) comprises a cylindrical groove (31) and a through hole (32) which is vertical to the cylindrical groove (31) and penetrates through the side wall of the cylindrical groove (31) and is used for connecting a piston rod of a clamping arm or a hydraulic cylinder. Compared with the prior art, the connecting device can stably connect the clamping arm or the piston rod of the hydraulic cylinder, has strong universality and good clamping and fixing effects on the connecting pipe.

Description

Back-up tong jaw structure

Technical Field

The utility model relates to the technical field of petroleum equipment manufacturing, in particular to a back-up tong jaw structure.

Background

In the screwing-in and unscrewing of oil pipes, sleeves and drill rod threads of oil field well heads, a power clamp for pipes is generally used for facilitating the disassembly and assembly of the threaded connection of the pipe column and ensuring good stability, the power clamp comprises a main clamp and a back-up clamp, the main clamp plays a role in clamping and rotating to screw out, and the back-up clamp plays a role in clamping and fixing a connecting pipe. The common back-up tong clamping mode of the power tongs for the existing oil pipe is that firstly, two symmetrical translational jaw plate clamping mechanisms are adopted, and then an oil cylinder pushes a rack to drive the clamping mechanisms to rotate to realize clamping action; and secondly, a three-jaw plate clamping mechanism of two swing type jaw plates or two swing type jaw plates at the front part and a translation type jaw plate at the rear part is adopted, and then an oil cylinder is used for directly pushing the clamping mechanism to rotate so as to realize clamping action.

Chinese patent CN201220165868.3 discloses a direct-drive multi-jaw hydraulic power back-up tong, which directly pushes one of the jaw assemblies to make linear motion by using a hydraulic cylinder, and drives the other jaw assemblies to make rotary motion, thereby realizing a back-up tong structure in which a plurality of jaws clamp attention synchronously. The back-up tong has the advantages of simple structure principle, compact structure, convenience in manufacturing, good clamping stability and few easily-damaged parts, however, the tong teeth which do linear motion and the tong teeth which do rotary motion are different in structure and need to be designed and arranged respectively, the universality is not strong, the connection strength and the stability of the tong teeth and a piston rod of a clamping arm or a hydraulic cylinder are not strong, and the clamping and fixing effect on a connecting pipe is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a back-up tong tooth structure, which can be used for stably connecting a clamping arm or a piston rod of a hydraulic cylinder, has strong universality and has good clamping and fixing effects on a connecting pipe.

The purpose of the utility model can be realized by the following technical scheme: the utility model provides a back-up tong tooth structure, includes the main part and sets up block portion and the fixed part in the main part both sides, block portion have concave-convex structure for the chucking connecting pipe, the fixed part include cylindrical groove and with cylindrical groove perpendicular and run through the through-hole of cylindrical groove lateral wall, be used for connecting the piston rod of clamping arm or pneumatic cylinder.

Preferably, auxiliary fixing holes are further formed in two sides of the through hole.

Further preferably, the outer sides of the through hole and the auxiliary fixing hole are provided with protective bosses.

Still further preferably, the protection boss is provided with a bevel structure.

Preferably, the edge of the opening of the cylindrical groove is provided with a chamfer.

Preferably, the main body is further provided with a threaded hole, and the surface where the opening of the threaded hole is located is positioned on two sides of the surface where the opening of the cylindrical groove is located.

Further preferably, the threaded holes are symmetrically provided in plurality.

Preferably, the clamping part comprises a V-shaped groove and a dovetail groove further formed in the V-shaped groove, the angle of the V-shaped groove is an obtuse angle, and the cross section of the dovetail groove is in an isosceles trapezoid shape.

Further preferably, two dovetail grooves are symmetrically arranged in the V-shaped groove, and the length of each dovetail groove is equal to that of the V-shaped groove.

Still further preferably, the angle of the V-shaped groove is 140-150 degrees, and the acute angle of the isosceles trapezoid of the dovetail groove is 15-20 degrees.

A five-axis linkage machine tool numerical control machining method of the back-up tong jaw structure comprises the following steps:

s1: clamping one end of a blank in a cubic shape by using flat tongs, and milling a cylindrical groove, a chamfer, a protection boss and an inclined plane structure;

s2: clamping the other end of the blank by using flat tongs, and milling a V-shaped groove and a dovetail groove;

s3: in the steps S1-S2, the rough machining is firstly carried out, the balance is 0.5mm, and the fine machining is carried out again, and the balance is 0 mm;

s4: and drilling a through hole by using a drill cutter, matching the drill cutter with a thread milling cutter, and drilling and milling an auxiliary fixing hole and a threaded hole.

The numerical control machining method solves the problems that the machining procedure of the tong head part is complex in machining production, and the precision is affected by repeated disassembly and assembly, improves the dimensional precision of the tong head part, and is simple and easy to realize, and stable in machining quality.

Compared with the prior art, the utility model has the following advantages:

1. the back-up tong tooth structure is matched and connected with the piston rod of the clamping arm or the hydraulic cylinder through the cylindrical groove and the through hole which is vertical to the cylindrical groove and penetrates through the side wall of the cylindrical groove, and the cylindrical groove is vertical to the through hole, so that connecting pieces inserted from the cylindrical groove and the through hole are vertical to each other, and the connecting strength and the stability are improved;

2. according to the utility model, the auxiliary fixing holes are arranged on the two sides of the through hole, so that the connecting piece inserted from the through hole can be further fixed, the connecting piece is prevented from rotating, and the connecting strength and the stability are stronger;

3. the arrangement of the protection boss can reduce the abrasion of the connecting piece, and the arrangement of the inclined plane structure is further beneficial to timely dropping of scraps and the like generated in the process, so that the influence on the normal work of the connecting piece is avoided;

4. according to the utility model, the clamping part is designed in a way that the V-shaped groove and the dovetail groove are matched, so that the whole surface of the clamping part is of a concave-convex structure, the friction force with the connecting rod is stronger, the clamping is tighter, and the clamping of the connecting rod is more facilitated;

5. according to the utility model, through the matching arrangement of the threaded holes, more connecting pieces which are beneficial to improving the stability and the strength of the tong teeth can be connected through the threaded holes, so that the overall strength of the back-up tong is further improved;

6. the back-up tong jaw structure can stably connect the clamping arm or the piston rod of the hydraulic cylinder, has strong universality and good clamping and fixing effects on the connecting pipe.

Drawings

FIG. 1 is a first structural schematic view of a back-up tong tooth structure according to the present invention;

FIG. 2 is a second structural schematic view of a back-up tong tooth structure according to the present invention;

in the figure: 1-main body, 2-clamping part, 21-V-shaped groove, 22-dovetail groove, 3-fixing part, 31-cylindrical groove, 311-chamfer, 32-through hole, 33-auxiliary fixing hole, 4-protection boss, 41-inclined plane structure and 5-threaded hole.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.

Example 1

A back-up tong tooth structure comprises a main body 1, a clamping part 2, a fixing part 3 and a protection boss 4 as shown in figures 1-2. The main part 1 is the cube structure, and main part 1 one side is equipped with block portion 2, and block portion 2 is concave-convex structure for chucking connecting pipe, and concave-convex structure comprises V-arrangement groove 21 and the dovetail 22 of further symmetry division in V-arrangement groove 21 cooperation, can closely block with the connecting pipe. The opposite side of main part 1 is equipped with fixed part 3, and fixed part 3 is equipped with supplementary fixed orifices 33 including offering at the cylindrical groove 31 with the 2 place opposite sides of block portion and the through-hole 32 that runs through the 3 lateral walls of cylindrical groove with the 3 axis perpendicularity in cylindrical groove, is equipped with the protection boss 4 that has inclined plane structure 41 in the outside of through-hole 32 and supplementary fixed orifices 33, is equipped with chamfer 311 at the opening edge of cylindrical groove 3, makes things convenient for the connecting piece to get into cylindrical groove 3. The main body 1 is also provided with a plurality of threaded holes 5 at two sides of the surface of the cylindrical groove 3.

Example 2

A five-axis linkage machine tool numerical control machining method of a back-up tong jaw structure is used for machining the back-up tong jaw structure in embodiment 1 and comprises the following steps:

s1: clamping one end of a cuboid blank (175 mm in length, 165.7mm in width and 128.78 in height) by using flat tongs, selecting a milling cutter (phi 10mm) to mill a cylindrical groove 31 with phi 88.98mm in depth and 35.09mm in depth, changing the milling cutter (cone angle 45 degrees) to process a chamfer 311, changing the milling cutter (phi 10mm) to mill a protection boss 4 (depth 13.46mm) and an inclined plane structure 41;

s2: clamping the other end of the blank by using flat tongs, milling the V-shaped groove 21 by using a milling cutter (with a sharp angle of 18 degrees), wherein the angle of the V-shaped groove 21 is 144 degrees, the length of the V-shaped groove is 128.78mm, and milling the dovetail groove with an angle of 18 degrees and a length of 128.78mm by using a milling cutter (with a taper angle of-15 degrees);

s4: changing a drill cutter (phi 16mm) to drill a phi 16mm through hole 32, changing the drill cutter (phi 6mm) to drill two phi 6mm blind holes with the depth of 19mm, changing a thread milling cutter (phi 4mm) to perform thread milling to obtain an auxiliary fixed hole 33, changing the drill cutter (phi 14mm) to drill four 14mm blind holes with the depth of 25.4mm, and performing thread milling on the changed thread milling cutter (phi 7mm) to obtain a threaded hole 5.

And in the feeding process, the advantages of five-axis linkage are utilized to effectively use milling and drilling according to the tool path requirement of the part to process the part. During the rough milling process, only the disassembly, the turning and the clamping are needed for one time, thereby effectively avoiding the error generated during the processing by the traditional processing method. The tool wear is reduced by balancing the cutting load in the numerical control machining process, the precision of the clamp head part is improved, the error is reduced, and the outer surface process is attractive.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The utility model provides a back-up tong tooth structure, its characterized in that includes main part (1) and sets up block portion (2) and fixed part (3) in main part (1) both sides, block portion (2) have concave-convex structure for chucking connecting pipe, fixed part (3) include cylindrical groove (31) and through-hole (32) perpendicular and through cylindrical groove (31) lateral wall with cylindrical groove (31) for connect the piston rod of pressing from both sides tight arm or pneumatic cylinder.

2. The back-up tong tooth structure according to claim 1, wherein auxiliary fixing holes (33) are further formed on both sides of the through hole (32).

3. The back-up tong tooth structure of claim 2, wherein the through hole (32) and the auxiliary fixing hole (33) are provided with protective bosses (4) at the outer sides.

4. The back-up tong tooth structure according to claim 3, characterized in that the protection boss (4) is provided with a bevel structure (41).

5. The back-up tong die structure according to claim 1, characterized in that the edge of the opening of the cylindrical groove (31) is provided with a chamfer (311).

6. The back-up tong tooth structure as claimed in claim 1, wherein the main body (1) is further provided with a threaded hole (5), and the surface of the threaded hole (5) where the opening is located is positioned at two sides of the surface of the cylindrical groove (31) where the opening is located.

7. The back-up tong die structure according to claim 6, characterized in that the threaded holes (5) are symmetrically provided in plurality.

8. The back-up tong die structure according to claim 1, wherein the engaging part (2) comprises a V-shaped groove (21) and a dovetail groove (22) further formed in the V-shaped groove (21), the angle of the V-shaped groove (21) is an obtuse angle, and the cross-sectional shape of the dovetail groove (22) is an isosceles trapezoid.

9. The back-up tong die structure according to claim 8, wherein two dovetail grooves (22) are symmetrically arranged in the V-shaped groove (21) and are as long as the V-shaped groove (21).

10. The back-up tong die structure according to claim 9, wherein the angle of the V-shaped groove is 140-150 °, and the acute isosceles trapezoid angle of the dovetail groove (22) is 15-20 °.