Self-balancing large-diameter bolt and special mechanical torque wrench device for same

Abstract

The invention discloses a self-balancing large-diameter bolt and a special mechanical torque wrench device for the same, wherein the bolt comprises a bolt body. The tail end of a thread of the bolt body is provided with a positioning section of a non-circular section structure, the special mechanical torque wrench device comprises a common mechanical torque wrench, and a torque crossover coupling is arranged at a power output end of the common mechanical torque wrench. The self-balancing large-diameter bolt and the special mechanical torque wrench device are applicable to petroleum, chemical engineering, large engineering machinery, traffic, electric power, aviation, bridges and the like needing large-diameter bolt connection, by means of the special design of a bolt structure, the bolt is completely balanced inside a bolt connector by the aid of torque and restoring torque in pre-tightening or loosening of the special mechanical torque wrench device without any types of counter-force supports, the pre-tightening force of the bolt is strictly ensured, the labor intensity of mounting is reduced, the efficiency of mounting or dismounting the bolt is greatly improved, and downtime of connected equipment is shortened.

Description

technical field [0001] The invention relates to the field of engineering technology, in particular to a self-balancing large-diameter bolt and a special motorized torque wrench device used for the bolt connection. Background technique [0002] In the field of engineering, large-diameter bolts are often used in important connection occasions, and only by properly controlling their pre-tightening force can the reliability of bolted connections be guaranteed. At present, three methods are mainly used for pre-tightening. One is to use an extended wrench to pre-tighten manually; the other is to use a torque wrench to pre-tighten manually; Its defects are as follows: [0003] 1. The method of manual pre-tightening with extended wrench is labor-intensive and inefficient, and the actual pre-tightening force depends on the experience of the workers, and there are potential safety hazards in bolted connections. [0004] 2. Adopt the method of artificially utilizing the torque wrench...

AI Technical Summary

Problems solved by technology

[0003] 1. The method of manual pre-tightening with lengthened wrench is labor-intensive and inefficient, and the actual pre-tightening force depends on the experience of the workers, and there are potential safety hazards in the bolt connection

[0004] 2. Using the method of manually using the torque wrench to pre-tighten, although the pre-tightening force can be guaranteed, but the labor intensity is high and the efficiency is low

And when the bolt diameter is large to a certain extent, it is difficult to pre-tighten

[0005] 3. Manual operation is adopted, and the installation and removal of bolts under high-altitude operation conditions are more dangerous

Due to the diversity of bolt connection occasions, the versatility of the reaction force support is poor, which greatly reduces the efficiency of installation

In addition, in most cases, the reaction force support will cause a certain degree of damage to the surface of the connected parts

It is not convenient in actual use, see figure 1 shown

[0007] 5. Manually using a torque wrench or using a motorized torque wrench with a reaction support to pre-tighten will generate eccentric extrusion loads on the bolts, thereby reducing the accuracy of the torque, affecting the matching accuracy of the thread pair, and reducing the reliability of the connection.

[0009] Diameter bolts not only ensure the pre-tightening force, but also do not require a reaction support, and there is no eccentric extrusion load, but the structure is too complicated, and because it needs to be equipped with a hydraulic system, the economy is poor

[0010] 7. GB / T3632-2008 > solves the problem of pre-tightening with motorized wrench for large-diameter bolt connection (standard range includes M16~M30) in the construction industry, which not only ensures Pretightening force does not require reaction support and no eccentric extrusion load, but it is only suitable for one-time connection occasions. Generally, disassembly is not allowed, and bolts must be replaced after disassembly, so it is not suitable for The connection occasions for maintenance and disassembly, the scope of application is limited

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