Torque testing machine for drill rod joint

Abstract

The invention discloses a torque testing machine for a drill rod joint. A pair of clamping pincers and a pair of rotation pincers, which are used for clamping and rotating two drill rods connected with a drop-proof joint, are respectively arranged on a rack. The pair of clamping pincers comprises a jaw plate frame, and a jaw plate is arranged on the jaw plate frame. The jaw plate frame is connected with a piston rod of a magnetic air cylinder, and a tension sensor is arranged on the jaw plate frame. Three magnetic switches are arranged on the magnetic air cylinder and are used for respectively testing the rising position, the middle position and the declining position of the air cylinder, and the rising and the declining of the magnetic air cylinder are controlled by a three-position five-way double-electric control slide valve. The pair of rotation pincers is controlled by an electro-hydraulic change valve. The invention aims at providing the torque testing machine for the drill rod joint, which has the advantages of reasonable structure, accurate data, safety, reliability, simplicity and convenience in operation and high efficiency.

Description

technical field [0001] The invention relates to a torque detection and testing machine for drill pipe joints. Background technique [0002] According to customer requirements, oil drill pipe manufacturers conduct make-up and breakout detection tests with different torque values ​​for the drill pipe joints according to the set torque several times (generally three times). Since there is no special torque detection and testing machine for drill pipe joints at present, the oil drill pipe manufacturers can only use ordinary screwing machines instead. The main clamping pliers of the existing screwing machine are generally clamped by six hydraulic cylinders, and one hydraulic cylinder is used to make and break the buckle. Since this structure can only swing at a certain angle and cannot rotate continuously, there will be a torque of up to If the set value is not reached, it may be necessary to perform multiple loosening, clamping, and make-up operations, and the same is true for ...

AI Technical Summary

Problems solved by technology

The main clamping pliers of the existing screwing machine are generally clamped by six hydraulic cylinders, and one hydraulic cylinder is used to make and break the buckle. Since this structure can only swing at a certain angle and cannot rotate continuously, there will be a torque of up to If it is less than the set value, it may be necessary to perform multiple loosening, clamping, and make-up operations, and the same is true for unfastening

The operation of this screwing machine is cumbersome, the operator is easy to make mistakes, and the production efficiency is low

In addition, the make-up and breakout torque values ​​of the existing screwing machines are converted from the pressure values ​​of the hydraulic system, and the error is relatively large

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