A life testing machine for a valve actuator

Abstract

The invention discloses a life testing machine for a valve actuator. The pressurized component, hydraulic component, high-pressure oil cylinder, friction clutch disc load torque device, dynamic torque sensor and angle encoder of the life testing machine are connected in sequence, the angle encoder is connected to the valve actuator to be tested, and the booster component controls the hydraulic oil Supercharging, the pressure is output to the high-pressure cylinder through the hydraulic components and the pressure is controlled; the high-pressure cylinder is equipped with a cylinder pressing part, and the oil cylinder pressing part cooperates with the friction clutch disc load torque device to convert the vertical pressing force into a torque load, And through the dynamic torque sensor and angle encoder to test the valve actuator. The present invention efficiently converts the axial vertical pressing force of the high-pressure oil cylinder into the load torque of the actuator through the cooperation of the load torque device of the friction clutch disc and the cylinder pressing part in the high-pressure oil cylinder, and can comprehensively control multiple key parts of the valve actuator. test.

Description

technical field [0001] The invention belongs to the field of testing valve actuators, in particular to a life testing machine for valve actuators. Background technique [0002] The quality of the valve actuator is very important, and an effective life test can guarantee the quality and improve the reliability. A good life test device can conduct comprehensive tests on many key parts of the valve actuator, such as worm gear, gear pair, operating efficiency, maximum control torque, position control accuracy, etc., to more realistically simulate the working conditions and various aspects of the valve. Performance parameter data, optimize valve structure design calculation, material, driver selection, etc. [0003] The existing valve actuator life test system uses hydraulic control to simulate the change of valve opening and closing torque. It is composed of a hydraulic loading device, a hydraulic control system and a circulating cooling system. Proportional regulation of high...

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Problems solved by technology

[0003] The existing valve actuator life test system uses hydraulic control to simulate the change of valve opening and closing torque. It is composed of a hydraulic loading device, a hydraulic control system and a circulating cooling system. Proportional regulation of high pressure and high pressure, monitoring the pressure at the high pressure end, combined with the rotary torque sensor to control the stroke to the closed-loop control of the output torque of the valve electric device. Due to the incompressibility of the hydraulic medium in the load circuit, the loading speed of the actuator must be very slow. Sufficient adjustment time to ensure that the proportional relief valve can adjust the back pressure The pressure stability is not high, the entire control system is complicated, the manufacturing and maintenance costs are high, and the maximum load torque characteristic is only 1200N.m, mainly because the design principle limits the maximum Torque load, and this way of simulating the valve stem nut to achieve the load torque value has low accuracy and large errors, and the test results are not convincing

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