Hydraulic motor starting performance testing device and method

Abstract

The invention discloses a hydraulic motor starting performance testing device which comprises a swinging hydraulic cylinder, a hydraulic system and an installation platform. A testing frame, a first transmission supporting frame, a second transmission supporting frame and a limiting supporting frame are arranged on the installation platform. Torque revolving speed sensors are arranged on the testing frame. The first transmission supporting frame and the second transmission supporting frame are arranged on the two sides of the testing frame respectively and connected with transmission shafts of the torque revolving speed sensors through couplers. The first transmission supporting frame is connected with the output shaft of a tested hydraulic motor and the second transmission supporting frame is connected with the output shaft of the swinging hydraulic cylinder. The swinging hydraulic cylinder is a gear and rack swinging hydraulic cylinder with an outwards-extending piston rod. The extending end portion of the piston rod of one side of the swinging hydraulic cylinder is connected with a lengthening part with length adjustable. A limit stop is arranged in the front of the extending end of the lengthening part and fixedly connected to the limiting supporting frame. The invention further discloses a hydraulic motor starting performance testing method. The hydraulic motor starting performance testing device is simple in system structure, convenient to operate, low in manufacturing cost and capable of being popularized and used.

Description

technical field [0001] The invention relates to a test device and a test method for the starting performance of a motor, in particular to a test device and a test method for the starting performance of a hydraulic motor. Background technique [0002] At present, a hydraulic motor is a component that converts hydraulic energy into mechanical energy. Startability refers to the starting ability of a motor under a specified load, which is an important characteristic of a hydraulic motor. [0003] The hydraulic motor startability test is to measure the output torque of the hydraulic motor, the pressure difference between the inlet and outlet and the phase angle. [0004] There are three kinds of constant torque loading methods: loading beam, electric dynamometer and hydraulic pump for the constant torque test of the starting performance of conventional hydraulic motors. Among them, the loading beam is loaded through a loading device composed of counterweights, support bearings ...

AI Technical Summary

Problems solved by technology

When this method is used to test different phase angle torques, it needs to load, unload and level the loading beam with the French code, and the efficiency is low; when the DC dynamometer is used as the load of the hydraulic motor, it can be operated as a DC generator. Due to the large speed regulation range, The advantages of convenient adjustment, stable operation, and energy recovery are widely used, but the system must have a speed-up device to meet the test requirements, and the system is complex and requires a large investment

In addition, the loading device itself has a large moment of inertia, so it is difficult to realize the start-up loading test based on the real static torque; and the hydraulic pump loading is to use the two-way hydraulic pump as the load of the tested motor, and different loading values ​​can be adjusted by adjusting Pressure realization of electromagnetic proportional relief valve (or throttle valve)

This system is simple in structure and easy to adjust, but the key of this system lies in the minimum stable flow through the valve at low speed and the influence of the displacement pulsation of the bidirectional hydraulic pump, so it is necessary to add a speed increasing device when it is used to measure the starting torque of the hydraulic motor. And the effect is still not ideal

The above-mentioned constant torque loading device used in the startability test of the conventional hydraulic motor has the problems of complex structure and cumbersome operation

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