Zero-torque tightening mechanism for nut of check valve

Abstract

The invention discloses a zero-torque nut tightening mechanism for a cut-off valve, which comprises a nut zero-torque tightening mechanism, a bonnet nut tightening mechanism, a bracket and a positioning sleeve. One side of the bonnet nut tightening mechanism is connected with a bracket through bolts. One side of the bracket is connected with a positioning sleeve through bolts, and the positioning sleeve is used in conjunction with the bonnet nut tightening mechanism and the nut zero-torque tightening mechanism respectively. The nut zero-torque tightening mechanism consists of a screw seat, a servo motor, and a base , sliding table cylinder, deep groove bearing and spring, one side of the base is connected with the sliding table cylinder by bolts, the top of the sliding table cylinder is connected with the optical fiber detection return position through the connecting rod, one of the sliding table cylinders The side is connected with a servo motor through bolts. This tightening mechanism avoids manual operation, manual tightening, saves time, is easy to operate, can detect whether the tightening is completed, and can be rotated and re-tightened when the product is detected to be unqualified.

Description

technical field [0001] The invention relates to the technical field of tightening mechanism equipment, in particular to a zero-torque tightening mechanism for stop valve nuts. Background technique [0002] Globe valve, also known as cut-off valve, is a forced sealing valve and is one of the most widely used valves. The globe valve relies on the pressure of the valve rod to make the sealing surface of the valve disc closely fit with the sealing surface of the valve seat to prevent the flow of the medium. Because the medium is only allowed to flow in one direction, it is directional during installation. Globe valves can be divided into straight-line globe valves, angle globe valves, plunger-type globe valves, upper threaded stem globe valves, lower threaded stem globe valves, etc. They are durable, small opening height, easy to manufacture, and convenient to maintain. , not only suitable for medium and low pressure, but also suitable for high pressure characteristics. Howeve...

AI Technical Summary

Problems solved by technology

However, the existing zero-torque tightening mechanism for globe valve nuts is manually tightened, which is a waste of physical strength and inconvenient to operate. Therefore, it is necessary to design a zero-torque tightening mechanism for globe valve nuts.

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