Energy-saving wide-range high-precision pulseless hydraulic loading system

Abstract

The invention discloses an energy-saving wide-range high-precision pulsation-free hydraulic loading system, which is applied to mechanical and detection devices and belongs to the field of hydraulic power control systems. The loading system comprises an speed adjustable control system, a set of synchronous motor and a first hydraulic plunger pump / internal engaging gear pump, and another set of synchronous motor / asynchronous motor and a second hydraulic plunger pump / internal engaging gear pump. The loading system uses the control system to control the rotating speed of the synchronous motor so as to drive the hydraulic plunger pump or the internal engaging gear pump connected therewith to work and supply oil, while another set of the synchronous motor or the asynchronous motor works at certain speed or a variable speed to drive the hydraulic plunger pump or the internal engaging gear pump connected therewith to work and supply oil, and the two sets of systems work together to form a dynamic, wide-range adjustable and pulsation-free hydraulic loading system which outputs high-precision and high-resolution fuel delivery so as to achieve the function of controlling an external device precisely.

Description

technical field [0001] The invention discloses an energy-saving wide-range high-precision non-pulsation hydraulic loading system, which is applied to mechanical control and hydraulic detection equipment. Background technique [0002] At present, with the continuous improvement of the precision, energy consumption and cost requirements of mechanical control, materials and product testing equipment, the requirements for the hydraulic loading system are getting higher and higher. The original system can no longer adapt to this change, and there are many defects. , no matter in terms of control or cost, it has been unable to meet the requirements. The existing control system basically works in the following ways: [0003] 1) Valve control mode: The quantitative pump valve control system uses electro-hydraulic servo valves or proportional valves to precisely control the oil supply (the oil must be strictly managed for cleanliness), and the excess flow other than the required flo...

AI Technical Summary

Problems solved by technology

[0003] 1) Valve control mode: The quantitative pump valve control system uses electro-hydraulic servo valves or proportional valves to precisely control the oil supply (the oil must be strictly managed for cleanliness), and the excess flow other than the required flow is all from the overflow The valve discharges, the system heats up, the energy consumption is large, and the small flow control accuracy is poor

[0004] 2) Controlled by quantitative pump, PQ proportional valve and load valve, the energy consumption is improved and the flow rate of the overflow valve is reduced, but the quantitative pump system rotates at the rated number of revolutions during the whole working process, the noise is large and the power consumption is low, and the flow rate is small Poor control accuracy

[0005] 3) The method of adjusting the flow rate is to use the quantitative pump and ordinary motor plus frequency conversion speed regulation, but the pressure adjustment still needs to be assisted by the relief valve, and because the torque of the frequency converter is not enough at low speed, the starting speed is slow, making the control Accuracy deterioration

When unloading and maintaining pressure, some energy will be lost due to leakage inside the system, and the low efficiency of the motor at low load will also cause energy loss, and it is difficult to further reduce energy loss, and the control accuracy of small flow is poor

[0007] 5) AC servo drive plus servo motor plus quantitative pump to adjust the flow, but the speed of the servo motor is too low when the flow is small, resulting in large hydraulic pulsation and poor control accuracy for small flow

[0011] 3) The existing hydraulic loading system has a large heat generation and high oil temperature, resulting in poor oil quality and poor control effect;

[0012] 4) The pressure of the existing hydraulic loading system is generally relatively low, resulting in bulky system and increased cost

[0013] The most critical point is that the adjustment range of the existing hydraulic loading system is small, it cannot work in a wide range, and the control accuracy is poor, especially in small flow control, which is a blind spot

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