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Load difference oil-electro-hydraulic composite back pressure regulation double-actuator system

A hydraulic actuator, oil-electro-hydraulic technology, applied in the field of control systems, can solve the problems such as low-load actuator control valve throttling loss can not be eliminated, to solve the hydraulic oil heating and aging, reduce heat generation, reduce installed power Effect

Active Publication Date: 2017-12-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the published invention patent "Energy-saving shield segment assembly and positioning electro-hydraulic control system using load-sensing technology, CN103032396A", the multi-actuator system often has the characteristics of a wide range of load changes. By adopting the load-sensing control principle, the The output pressure of the hydraulic pump always changes with the change of the load, avoiding the energy waste caused by the original system always supplying oil at the highest working pressure, and reducing the throttling loss and overflow loss, but because the output pressure of the pump can only match the highest For multi-actuator systems, the throttling loss of low-load actuator control valves caused by large load differences can never be eliminated, and this part of the loss is precisely the most important source of energy consumption for multi-actuator systems, accounting for 35%~39% of engine output power

Method used

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  • Load difference oil-electro-hydraulic composite back pressure regulation double-actuator system
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  • Load difference oil-electro-hydraulic composite back pressure regulation double-actuator system

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Embodiment 1

[0034] as attached figure 1 Shown is the embodiment 1 of the dual-actuator system for oil-electro-hydraulic composite backpressure control with load difference of the present invention, which includes an electric power control unit and a back pressure control unit connected to the transfer case to control the circuit principle of two hydraulic actuators. The system includes the power source 1 as an internal combustion engine, the main hydraulic pump 2 as a variable displacement hydraulic pump, the transfer case 3 as the main transmission torque, the speed ratio of each shaft is 1:1, and the set pressure of the safety valve 4 is 32 MPa , The first hydraulic actuator 6 is a hydraulic cylinder, the second hydraulic actuator 7 is a hydraulic cylinder, the first control valve 9, and the second control valve 10 are proportional multi-way valves with positive flow control. The structural relationship is that a power control unit 14 and a back pressure control unit 15 are further adde...

Embodiment 2

[0043] as attached figure 2 As shown, it is the embodiment 2 of the dual-actuator system of oil-electro-hydraulic composite back pressure control with load difference of the present invention, which includes a hydraulic power control unit and a back pressure control unit connected to the transfer case 3 to control the circuit principle of two hydraulic actuators .

[0044] The composition and connection relationship of this embodiment 2 is similar to that of embodiment 1, the difference is that the power control unit adopts hydraulic control mode, and the power control hydraulic pump / motor 8 adopts an axial plunger structure, and its drive shaft is directly connected to the transfer On the tank 3, the oil port P3 of the power regulating hydraulic pump / motor 8 communicates with the working oil port of the power regulating hydraulic accumulator 24 and the sixth pressure sensor 22, and the oil port P4 of the power regulating hydraulic pump / motor 8 communicates with the fuel tank...

Embodiment 3

[0046] as attached image 3 Shown is the embodiment 3 of the dual-actuator system for load differential oil-electro-hydraulic composite backpressure regulation of the present invention, which only uses the circuit principle of the backpressure regulation unit connected to the transfer case 3 to control the two hydraulic actuators. The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the system does not include a power regulation unit.

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Abstract

The invention discloses a load difference oil-electro-hydraulic composite back pressure regulation double-actuator system. A power regulation unit, a back pressure regulation unit, a controller, conversion control valves, pilot operated check valves and pressure sensors are additionally arranged, an energy recycling structure is adopted, the pressures of oil return cavities of actuators expect a maximum load actuator are controlled to enable the differential pressures of oil inlet cavities of all the actuators and all control valve ports to be equal, thus, the pressure and flow of a hydraulic pump are matched with all the actuators, and throttling losses of multi-actuator systems caused by load differences are eliminated. Defects in the prior art are effectively overcome, and the double-actuator system has the advantages of high energy efficiency, low emission, kinetic energy recycling, power matching integration and the like in many aspects.

Description

technical field [0001] The invention relates to a multi-actuator control system in hydraulic control technology, in particular to an electro-hydraulic control technology for low differential loss loss of a multi-actuator system used in engineering equipment. Background technique [0002] Various types of non-road mobile equipment such as construction machinery, road construction machinery, mining machinery, forestry machinery, and agricultural machinery currently use internal combustion engines to drive hydraulic pumps as power sources, and distribute and transmit power through multi-way valves and pipelines to control The hydraulic system with compound actions of multiple actuators is also the most widely used and most important field of hydraulic technology. It is characterized by high power density, compact structure, good maneuverability and strong environmental adaptability, but the fatal disadvantage is low energy utilization. The energy efficiency of the whole machine...

Claims

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Application Information

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IPC IPC(8): F15B21/08F15B11/17F15B13/06F15B19/00F15B21/04F15B1/02
CPCF15B1/02F15B11/17F15B13/06F15B19/00F15B21/042F15B21/087
Inventor 权仲翊杨敬葛磊权龙王波
Owner TAIYUAN UNIV OF TECH
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