Torque loading system of hydraulic pump

Abstract

The invention discloses a torque loading system of a hydraulic pump. The system provides a control oil source additionally for a proportion overflowing valve at an outlet of the hydraulic pump; as being passed by oil all the time, the proportion overflowing valve can be in better working characteristics, and can carry out torque loading for the hydraulic pump with low rotating speed, even zero rotating speed. Simultaneously, the torque loading system uses the electronic elements of a potentiometer, an electronic switch, a button and the like to form a torque loading control module, adjusts theloaded torque by adjusting external control signals or the potentiometer, and realizes impact loading and impact unloading of the torque by the button, thus leading the loading system to have the functions of impact loading, impact unloading and continuous loading and the like. Besides, the pressure valve of the provided control oil is equal to the highest working pressure of the proportion overflowing valve so as to guarantee that the control oil can enter the proportion overflowing valve by a one-way valve under any condition and increase the range of loading the torque of the torque loading system.

Description

technical field [0001] The invention relates to the technical field of hydraulic loading and automation devices, in particular to a hydraulic pump torque loading system capable of torque loading for zero-speed and low-speed rotating mechanisms. Background technique [0002] Mechanisms for rotating motion include various forms of motors, hydraulic motors, and swing cylinders. In experimental research, it is often necessary to analyze their ability to drive loads and their motion performance under load, so it is necessary to simulate loads that conform to actual working conditions. At present, the commonly used torque loading methods in rotary motion mainly include the following: loading by magnetic powder brakes, loading by dynamometers, and loading by hydraulic pumps. These loading methods have their own advantages and disadvantages, and can be applied to different occasions. [0003] The structure of the hydraulic pump torque loading system in the prior art includes a tor...

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Problems solved by technology

[0006] The disadvantage of the existing hydraulic pump torque loading system is that when the loaded rotating mechanism is stationary, the hydraulic pump cannot load it at all, and the loading torque is also unstable at low speeds

This is because the working characteristic of the proportional relief valve is that if no hydraulic oil passes through the proportional relief valve, the working pressure cannot be established; if the hydraulic oil flow through the proportional relief valve is small and the flow is unstable, the proportional The working characteristics of the relief valve are very poor, and its working pressure fluctuates greatly, which cannot be stably controlled

Therefore, when the rotation speed is zero, the hydraulic pump has no flow output, and the proportional relief valve at the outlet of the hydraulic pump has no flow through, and the working pressure cannot be established. At this time, the outlet pressure of the hydraulic pump is 0, and loading cannot be performed.

When the hydraulic pump is loaded at a very low speed, the hydraulic oil flow output by the hydraulic pump is very small and unstable. This unstable small flow passes through the proportional relief valve, which makes the working characteristics of the proportional relief valve very poor, causing the hydraulic pump Unstable outlet pressure, resulting in unstable loading torque

[0007] It can be seen that the existing hydraulic pump torque loading scheme cannot load the zero-speed rotating mechanism, and cannot provide stable loading torque for the low-speed rotating mechanism, which greatly limits the application range of hydraulic pump loading

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