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Rear tong head clamping mechanism of micro-damage screwing machine

A technology of clamping mechanism and twisting machine, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of increasing oil field workload and cost, damage of pipe string surface, pipe string corrosion, etc., and achieve economic benefits Considerable effect

Inactive Publication Date: 2011-05-18
吴立中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After repeated clamping, the surface of the pipe string will be damaged, and the corrosion of the pipe string will be accelerated

Method used

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  • Rear tong head clamping mechanism of micro-damage screwing machine
  • Rear tong head clamping mechanism of micro-damage screwing machine
  • Rear tong head clamping mechanism of micro-damage screwing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] in figure 1 , 2 In, a micro-damage screwing machine back pliers clamp head clamping mechanism consists of the lower jaw frame 1, the back clamp head body 2, the jaw plate 3, the roller shaft 4, the bearing spacer 5, the needle bearing 6, the roller 7, the tooth Block 8, upper jaw frame 9, screw 10, stop 11, fixed sleeve 12, fixed shaft 13, screw 14, back clamp head gear ring 15, motor seat 16, motor gear 17, hydraulic motor 18, pin shaft 19, The return spring 20 and the working arc 21 are composed. A working arc 21 is provided on the inner curved surface of the back pliers head main body 2, and the working arc 21 is directly processed on the back pliers head main body 2, or on an additional ramp. Three or more jaw plates 3 are arranged in the main body 2 of the back pliers head. The jaw plate 3 is equipped with a roller shaft 4, a roller 7, a tooth block 8 and a return spring 20. The roller shaft 4 is installed in the shaft hole of the jaw plate 3, the roller 7 is strin...

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Abstract

The invention discloses a rear tong head clamping mechanism of a micro-damage screwing machine. The mechanism consists of a rear tong head main body, a lower jaw plate rack, an upper jaw plate rack, jaw plates, tooth blocks, rollers, roller shafts, return springs, a fixed shaft, a fixed shaft sleeve, a rear tong head gear ring, a motor gear, a hydraulic motor and the like. The mechanism is structurally characterized in that: three or more jaw plates are arranged in the rear tong head main body; the roller shafts, the rollers, the tooth blocks and the return springs are arranged on the jaw plates; the inner curved surface of the rear tong head main body is provided with a working arc; and the lower jaw plate rack, the upper jaw plate rack and the rear tong head gear ring are connected into a whole by the fixed shaft, the fixed shaft sleeve and screws. The mechanism is a simple and reliable inner curved surface roller climbing multi-jaw plate clamping mechanism, the tooth blocks are made of abrasion-resistant material, and the contact area of the tooth blocks and tubular columns is enlarged so that the tooth blocks play a role in clamping the tubular columns without damaging the tubular columns; and the system has considerable economic benefit.

Description

Technical field [0001] The invention relates to a power tongs for petroleum machinery, in particular to a back tongs for screwing machines used for screwing up and unloading pipe string joints during oil field pipe string operation. Background technique [0002] The screwing machine is mainly used for fast loading and unloading of tubing and casing threading operations in oil fields. It is mainly composed of a main clamp and a back clamp. The back clamp clamps the pipe string coupling, and the main clamp clamps the pipe string to rotate to complete the screwing operation. Existing screwing machines generally use outer curved tooth blocks to achieve continuous clamping, and the contact with the pipe string is linear, and the tooth blocks have harder hardness and sharp tooth tips, so that the tooth blocks can cut into the pipe string to ensure clamping Reliable, so that after each clamping, a certain depth of tooth marks will be bitten on the outer surface of the pipe string. Aft...

Claims

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Application Information

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IPC IPC(8): E21B19/16
Inventor 吴立中
Owner 吴立中
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