Torque overload protection device

Abstract

The invention relates to a torque overload protection device. The device comprises a driving head, a driving seat, driving balls, a pressing ring, a driving device, an adjusting screw, an adjusting ball, an adjusting block, a butterfly spring group and a fixing bolt, wherein the cylindrical driving head is provided with a middle hole matched with a valve rod; a plurality of driving holes are uniformly formed on the top of the outer wall of the driving head; a limiting flange is arranged in the middle of the outer wall of the driving head; a plurality of bolt holes are formed at the periphery of the driving seat; the driving seat is provided with a middle hole matched with the excircle of a chattering head, and a plurality of driving grooves are uniformly distributed on the top end face of the middle hole; the driving seat is connected with the driving device through the fixing bolt; the lower section of the adjusting screw can stretch into a middle hole of the adjusting block, and the lower end of the adjusting screw is in compression joint with the adjusting ball; and the driving balls are arranged in the driving grooves and can move to the driving holes along the driving grooves. Compared with the prior art, the invention has the advantages that: the torque overload protection device is simple, convenient and accurate, has high control accuracy, can be set on site and the like.

Description

technical field [0001] The invention relates to a protection device, in particular to a torque overload protection device. Background technique [0002] Due to the excessive operating torque of the existing valve itself, or the excessive input torque of the handwheel, electric device, etc., which exceeds the maximum strength of the valve or worm gear box, distortion or damage of the valve, and cracking of the shell of the worm gear box often occur. In the existing solutions, the shear pin is mostly used as the weak link of the power transmission route. When the input power is greater than the set value, the shear pin will first shear and fail, the power transmission route will be interrupted, and important valves and worm gear boxes will be protected. [0003] In the existing technical solutions, due to the influence of materials and processing, the failure strength of the shear pin manufactured according to the calculated diameter is quite different from the set protection...

AI Technical Summary

Problems solved by technology

[0003] In the existing technical solutions, due to the influence of materials and processing, the failure strength of the shear pin manufactured according to the calculated diameter is quite different from the set protection value, resulting in low control accuracy

The diameter of the shear pin and the mating hole is difficult to change flexibly on site according to the requirements, resulting in the setting value of the safety torque cannot be adjusted on site, and the versatility is poor

The shearing pin needs to be replaced in time after failure, so spare parts are required and the maintenance workload is heavy

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