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A kind of manufacturing method of strain-type thread pre-tightening force sensor

A kind of manufacturing method of strain-type thread pre-tightening force sensor

(Summary description)The utility model relates to the technical field of sensors, in particular to a strain-type thread pre-tightening force sensor. In most cases, the uneven or insufficient bolt load is the reason for the failure and loosening of the bolt locking function, and accidents such as loosening and leakage of structural parts will occur.

A kind of manufacturing method of strain-type thread pre-tightening force sensor

(Summary description)The utility model relates to the technical field of sensors, in particular to a strain-type thread pre-tightening force sensor. In most cases, the uneven or insufficient bolt load is the reason for the failure and loosening of the bolt locking function, and accidents such as loosening and leakage of structural parts will occur.

Information

The utility model relates to the technical field of sensors, in particular to a strain-type thread pre-tightening force sensor. In most cases, the uneven or insufficient bolt load is the reason for the failure and loosening of the bolt locking function, and accidents such as loosening and leakage of structural parts will occur. In the current common bolt assembly process, the common method is to overload the gasket, use the rebound deformation of the gasket to compensate for subsequent bolt relaxation, thereby preventing the loosening of the mechanism parts, and use thread glue to reinforce the threaded coupling. However, with the change of time, the fatigue, corrosion, weathering and other reasons of the washer will cause the bolt preload to decrease, resulting in the loss of the locking function. During the operation of the bolt, the load of the bolt will change continuously, which may lead to the fatigue fracture of the bolt, or the loss of the thread glue and the loosening of the thread. For example, in critical (steel) structures, such as differential wind turbines, high-load bolts need to be inspected and retightened, very expensive, and even periodically replaced.

In view of the above technical deficiencies, the purpose of this utility model is to provide a strain-type thread pre-tightening force sensor, which can be used as a gasket for a long time, can directly monitor the pre-tightening force when locking the bolt, and can monitor the dynamic and static pre-tightening of the equipment in real time. force changes. In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions: the utility model provides a strain-type thread pre-tightening force sensor, which includes an annular elastic body, one end of the annular elastic body is provided with a raised flange, and the flange is connected with A second annular groove is arranged at the connection of the elastic body, and a first annular groove is arranged on the surface of the elastic body away from the flange; a plurality of strain gauges uniformly distributed along the circumferential direction are arranged in the first annular groove of the thread pre-tightening force sensor; and A strain gauge is attached to the inner peripheral wall of the first annular groove. The number of strain gauges is eight, and each two is connected in series. The vertical distance between the outer peripheral wall and the inner peripheral wall of the second annular groove of the thread preloading force sensor and the axis of the elastomer gradually decreases along the direction close to the first annular groove; the groove bottom of the second annular groove of the threading preloading force sensor is Arc face. Two threaded holes are symmetrically arranged on both sides of the threaded hole; the threaded hole of the threaded pre-tightening force sensor extends into the first annular groove and communicates with the first annular groove; the threaded hole of the threaded pre-tightening force sensor is a blind hole. A cover plate is also provided on the surface of the elastic body of the thread pre-tightening force sensor away from the flange.

The advantages of the utility model are: the sensor of the utility model can be placed between the bolt and the mechanism as a gasket, the pre-tightening force can be confirmed in real time during the bolt tightening process, and the dynamic and static pre-tightening force changes of the equipment in the later stage can be monitored; The two strain gauges connected in series are connected by a bridge, which is exactly the four strains required for the Wheatstone bridge. In addition, the first annular groove and the second annular groove interact during the bolt pre-tightening process, which increases the strain and improves the induction effect of the strain gauge.

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