Hydraulic locknut

Hydraulic Locking Nut Zhao Qin Harbin Coal Mine Machinery Institute, Harbin 150036, Heilongjiang, China It solved the problem of loosening bolt tightening, which has not been solved for a long time. It introduces the working principle and use status of hydraulic locknut. 0 Foreword Currently, Most of the equipment in the machinery industry is assembled after being processed separately. Threaded coupling is widely used in assembly, and bolt and nut are connected; 6 kinds of the most extensive thread coupling means. Therefore, improving the reliability of bolt-and-nut coupling is of great importance to the machinery industry.

When bolted and bolted, in most cases the nut is tightened during assembly. Pre-tightening is performed before the threaded joint is subjected to the load, so that the Baijia joint is justified. Tightness and improved anti-loose ability. However, in actual production, the pre-tightening force applied during installation and maintenance is + and sufficient. Adding a clever machine to the impact load is large, the vibration is large, so that the bolts in the work loose, resulting in the mechanical hair, so as to avoid such accidents as much as possible, people have designed hydraulic locknuts.

1The structure and working principle of the hydraulic anti-smashing nut The hydraulic anti-loose nut connection increases the pre-tightening force of the bolt connection, so that the high-strength bolt will deform in the axial direction and maintain the tension state, and the internal stress generated by the elastic deformation of the bolt will The nut is pressed tightly to achieve a new type of threaded connection. The structure is mainly composed of the nut cylinder 1 and the lock nut 3. The nut cylinder 1 and the piston 2 are formed as a single-acting cylinder.

Its work. 2, using high-strength bolt liquid helium locknut to work off the joint, tighten 2, the ultra-high hydraulic smash into the mountain nut cylinder 1 and the piston 2, the role of the cylinder. The piston 2, which acts on the 1 crop body, moves axially. The moving process greets the screw, and the thread on the cylinder 1 lengthens the bolt by 2, 3, so that the bolt is elastically deformed in the axial direction. Rotary lock nut 3 near screw 1 body 121. Received date 20010238; revised date 2002, so that the deformation of the bolt is still balanced after the release of hydraulic oil, so that the bolt is long, in the pull state, the same, to work The purpose of object fastening and thread locking.

1 nut cylinder 2 piston 3 lock nut 2 hydraulic locknut use current state of the art. Successfully solved the difficulty of loosening some bolts in coal mine machinery. For example, the shearer is a building block type mechanical device consisting of several parts such as the bottom bracket of the motor traction section, and the connection between the components is bolted. If the bolt is loose, a gap will be generated between the components. Causes damage to the coupling, etc. The sound of coal mining work. And 1. In order to facilitate underground transportation. It is desirable to divide the bottom bracket into two parts. Shipped to 1 for surface 1 洱 bolted fastening using liquid music locknut coupling 6,1, however, so far, hydraulic locknuts are in addition to the shearer. Have a good use, by the use of the coal mining machine maintenance and maintenance personnel 4 for the whip boat, which, Wei Wei Wei 1 carved Jian, 笕力 and 51 runs, 1 mine 蔌 Nunaru 2160 series axial flow main fan wind pressure Identification of Zhang Xiaoping Hegang Mining Bureau Safety Supervision Bureau, Hegang 154100, Heilongjiang Province. The preface is based on the regulations of the medium and mine safety enterprise regulations. Before it is put into use or reformed, it must be judged by its actual identification. Under normal circumstances, the Tonghetong joint pressure measurement is used. This measurement determines the accuracy and convenience of the Tentong and Tongtong combined pressure measurement method, and plays a positive role in determining the performance of the main fan and guiding the mine ventilation.

The reasons for the analysis are as follows: 1 liquid card anti-loose nut common nut comparison, the structure is complex, the size of the larger common nut size and the strength of the nut is 12.9, the supporting bolt must also be 10.9 or more, the price It is also relatively high, for example, the 42-father 3 nut. The ordinary nut is only for children, and the hydraulic release nut is more than 4 yuan, so it is only suitable for some important and sufficient assembly space.

1 Measurement process 1.1 Establish a special engineering implementation command department to measure wind resistance of not less than 5 people, no less than 4 wind measurement personnel, no less than 3 engineers and technicians responsible for calculation and drawing.

1.2 Preparation work and equipment Various ventilation instruments and instruments, sufficient resistance plate square type 2 use hydraulic locknuts, must be used with manual portable high-pressure oil chestnut, the output pressure must reach 250 rivers or more. At present, the internal market 1 rated music force can reach 250; 1 liquid helium is used as the fuel pipe pressure seal, etc., and the use of several domestic manual portable high-pressure oil pumps is not very good, so the manual portable high-pressure oil pump and accessories Basically rely on imports. This also hinders the promotion of the hydraulic screw 4.

3 knots, the language liquid 吒 anti-loose snails with the new thread coupling means, is the use of elastic deformation theory to the traditional transformation of the fasteners, it solves the loosening of the fastening bolts, which has not been solved for a long time. The continuous improvement of the entire industrial level, the factors that restrict the widespread popularity of hydraulic lock nuts will continue to decrease. Therefore, we believe that in the future, the liquid helium locknut improved in important occasions with high vibration and high anti-loose requirements will play a greater role.

Received date 20120331; revised date 2002

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