Pneumatic experimental table for loading electrical actuator

Abstract

The present invention discloses a pneumatic experimental table for loading an electrical actuator. A brake system for loading an electrical actuator comprises an electrical / pneumatic converter for regulating loading air pressure, a change valve for switching loading air circuits, a brake disk and a pneumatic brake. The brake disk is driven by the output shaft of the electrical actuator to rotate. Friction is loaded on the brake disk by the pneumatic brake under the action of compressed air. The following modes can be selected by the change valve: the pressure of the compressed air acts on the pneumatic brake after the adjustment of the electrical / pneumatic converter to exert adjustable friction on the brake disk, and the slow loading mode of the electrical actuator is realized; the compressed air directly acts on the pneumatic brake to exert maximum friction on the brake disk, and the quick loading mode of the electrical actuator is realized; the air pressure acting on the pneumatic brake is controlled by the electrical / pneumatic converter, and the variable speed unloading mode of the electrical actuator is realized. The present invention has the advantages that quick loading, slow loading, variable speed unloading and multiple modes of load control, which are required in the test process, can all be realized.

Description

technical field [0001] The invention relates to the technical field of testing equipment, in particular to a pneumatic loading test bench for testing electric actuators. [0002] Suitable for multi-turn actuator load testing, or angular rotation actuator load testing. It can be widely used in electric actuator production enterprises and laboratories, especially for electric actuators whose test output torque is within 20000Nm. Background technique [0003] As a test bench for actuators, the most important design is what kind of load method to use and how to design the load. [0004] At present, in factories and experimental units, it is especially common to use electromagnetic / magnetic powder brakes as load loading. Electromagnetic / magnetic powder brakes have a narrow range of use, small torque, and high speed, and are not suitable for the detection of high torque and low speed of electric actuators. [0005] With the advancement of science and technology, the pneumatic b...

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Problems solved by technology

[0009] Third, the torque controllability of the pneumatic brake is good at low speed (below 15 rpm); the magnetic powder brake is suitable for high-speed occasions, and it is most commonly used to test the high-speed motor as the load of the dynamometer, and it is used for low-speed operation after multi-stage deceleration Actuators with poor controllability and unstable load

[0010] Fourth, the multiplicity of the applicable torque range of the air pressure brake. The same type of brake can use three friction plates with different friction coefficients of high, medium and low, which can easily change the applicable torque in a large range; the same type of magnetic powder brake can be used The magnetic powder does not change much, and the applicable torque range is narrow

[0011] Fifth, the air pressure brake has a long maintenance period and is easy to maintain. The friction plate can be replaced on the equipment, and the service life is 45,000 to 60,000 hours; the magnetic powder brake can only be used within the allowable slip power, and maintenance is troublesome, and the service life is 5,000 to 8,000 hours.

[0012] Sixth, pneumatic loading can realize emergency braking in a short period of time. As long as the air circuit is connected, the gas will fill the brake cavity immediately, and the full pressure can be reached in about 0.05s; Large process, loses advantage in emergency braking

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