A hydraulic pump and motor test bench capable of recovering test energy consumption

Abstract

The invention discloses a hydraulic pump and a motor test bench capable of recovering the energy consumed by the test. The power synthesis box has two input shaft ends and one output shaft end; the first input shaft end of the power synthesis box is connected to the output shaft of the prime mover. connection, the second input shaft end is connected with the output shaft of the gearbox, the output shaft end of the power synthesis box is connected with the input shaft of the test hydraulic pump through the test pump input sensor; the output oil port of the test hydraulic pump is connected to the The reversing valve is equipped with a loading valve on the hydraulic pipeline; the reversing valve is connected to the two working oil ports of the test hydraulic motor; the output shaft of the test hydraulic motor is connected to the input shaft of the reversing box through the test motor output sensor, and the reversing box The output shaft is connected to the input shaft of the gearbox. The invention can not only carry out stepless loading on the test pump and motor; but also can return the mechanical energy output by the test motor to the input shaft of the test hydraulic pump to become the test power; the energy recovery method is simple.

Description

[0001] 【Technical field】 [0002] The invention relates to a test bench for hydraulic pumps and hydraulic motors, in particular to a test bench suitable for power characteristic detection and reliability assessment of various hydraulic pumps and motors. [0003] 【Background technique】 [0004] Hydraulic pump and hydraulic motor test bench (hereinafter referred to as "test bench") is the necessary equipment for performance testing, reliability assessment and related law research on hydraulic pumps and hydraulic motors. [0005] There are two loading methods for the hydraulic pump test bench: the first one is to apply pressure to the hydraulic oil output by the hydraulic pump under test by using the overflow valve throttling method. In this way, all the energy output by the hydraulic pump under test is converted into heat energy consumption. This makes the test consume a lot of energy, especially when performing high-power and long-term tests. The second is to design an energy r...

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Problems solved by technology

The second is to design an energy recovery device to recycle the energy output by the hydraulic pump under test. There are two energy recovery methods: one is to convert the mechanical energy output by the hydraulic pump under test into electrical energy recovery. This recovery method The equipment is complex, expensive, and difficult to install and debug; another energy recovery method is to directly recover the mechanical energy output by the hydraulic pump under test. The application number is 201210094856.0, and the Chinese patent titled "Hydraulic Pump Adaptive Power Test Bench" discloses a A test bench adopts the method of direct recovery of mechanical energy. All the energy output by the tested hydraulic pump of this test bench passes through a throttle valve, and the energy consumption is relatively large. At the same time, this test bench has difficulty in loading load control and poor working stability. Shortcomings

The electric energy recovery method is technically complex, expensive, and the recovery efficiency is not high; the Chinese patent with the application number CN201210437532.2 and the name "Hydraulic Motor Test System" discloses a hydraulic motor test scheme for direct recovery of mechanical energy, which has many components. The structure is complex, and the energy-saving effect is not ideal

[0007] At the same time, the above-mentioned various loading methods have the disadvantage of unsatisfactory application of dynamic load

[0008] The Chinese patent with the application number CN201310394825.1 and titled "A Reliability Test Method and Device for Axial Piston Pumps and Motors" discloses a hydraulic pump and motor test bench scheme for direct recovery of mechanical energy, which will be tested The hydraulic pump and the tested hydraulic motor are respectively connected to both ends of a double-shaft motor, so that the motor shaft not only bears the torque generated by the motor itself, but also bears the torque generated by the power recovered by the system, causing the motor to be stressed. Unreasonable; in addition, this device can only be used to test the hydraulic motor of the hydraulic pump whose rotation speed and direction are compatible with each other, and cannot use one hydraulic pump to test both rotation directions of the hydraulic motor

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