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An Independent Control System of Inlet and Outlet with Pressure Compensation

A pressure compensation, independent control technology, applied in the direction of fluid pressure actuation system components, fluid pressure actuation system testing, fluid pressure actuation devices, etc. , to achieve fast response and efficient work, improve the effect of compensation pressure difference

Active Publication Date: 2021-01-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for construction machinery such as excavators, where a single power source drives multiple actuators in parallel, when multiple actuators act in combination, in order to maintain good controllability and reduce the impact of the load pressure of each actuator, the flow of each actuator can be adjusted according to the demand. Distribution requires the use of multiple sensors to simultaneously collect multiple actuator pressure / flow parameters to control multiple reversing valves. The control strategy is extremely complex and the system cost is high

Method used

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  • An Independent Control System of Inlet and Outlet with Pressure Compensation
  • An Independent Control System of Inlet and Outlet with Pressure Compensation
  • An Independent Control System of Inlet and Outlet with Pressure Compensation

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An independent control system for oil inlet and outlet with pressure compensation, including: hydraulic power source 1, overflow valve 2, independent inlet and outlet control valve group 3, hydraulic actuator 5; it is characterized in that it also includes a load selection valve 4, electronic Pressure compensation valve 6;

[0037] Such as figure 1 As shown, the import and export independent control valve group 3 is composed of the first two-position two-way proportional directional valve 8, the second two-position two-way proportional directional valve 9, the third three-position two-way proportional directional valve 10 and the fourth Two-position two-way proportional directional control valve 11;

[0038] The oil inlet A of the electronic pressure compensation valve 6 is connected with the oil outlet of the hydraulic power source 1, and the oil outlet B of the electronic pressure compensation valve 6 is connected with the second control chamber P of the electronic p...

Embodiment approach

[0051] Such as Figure 5 As shown, the second embodiment of an independent control system for oil inlet and outlet with pressure compensation in the present invention differs from Embodiment 1 in that it includes an electro-hydraulic pressure compensation valve 7, and the hydraulic pump of the hydraulic power source 1 is a mechanical load sensing pump;

[0052] The LS oil circuit of the mechanical load sensing pump is connected with the first control chamber P of the electro-hydraulic pressure compensation valve 7 at the same time. F , The oil port G of the load selection valve 4 is connected. The oil inlet A of the electro-hydraulic pressure compensation valve 7 communicates with the oil outlet of the hydraulic power source 1, and the oil outlet B of the electro-hydraulic pressure compensation valve 7 communicates with the second control chamber P of the electro-hydraulic pressure compensation valve 7. E , Oil port C of the second two-position two-way proportional reversing...

Embodiment 3

[0059] Such as Figure 7 As shown, the third embodiment of a pressure-compensated oil inlet and outlet independent control system of the present invention differs from Embodiment 1 in that: the inlet and outlet independent control valve group 3 is composed of the first three-position three-way reversing valve 23 Constituted with the second three-position three-way reversing valve 24;

[0060] The oil inlet A of the electronic pressure compensation valve 6 is connected with the oil outlet of the hydraulic power source 1, and the oil outlet B of the electronic pressure compensation valve 6 is respectively connected with the oil inlet P of the first three-position three-way reversing valve 23. Ⅰ and the oil inlet P of the second three-position three-way reversing valve 24 Ⅱ Connected, the oil outlet T of the first three-position three-way reversing valve 23 Ⅰ And the oil outlet T of the second three-position three-way reversing valve 24 Ⅱ They are respectively connected to the...

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Abstract

The invention provides an independent control system for oil inlet and outlet with pressure compensation, comprising: a hydraulic power source (1), an overflow valve (2), an independent inlet and outlet control valve group (3), and a hydraulic actuator (5); It is characterized in that: a load selection valve (4), a new type of electronic pressure compensation valve (6) or an electro-hydraulic pressure compensation valve (7) are further added, which improves the controllability of the independent system of the oil inlet and outlet of multiple actuators, and simplifies the balance of the system. The control complexity of the multi-actuator load difference can also reduce the system cost, realize the real-time continuous regulation of the compensation pressure difference and the real-time position feedback monitoring of the compensation spool. The independent oil inlet and outlet control system with pressure compensation disclosed by the invention has the advantages of simple control, high degree of intelligence, strong applicability to working conditions, low energy consumption, fast response and the like.

Description

technical field [0001] The invention belongs to the hydraulic system of construction machinery, and in particular relates to an independent control system for inlet and outlet with a pressure compensating valve. Background technique [0002] Existing construction machinery adopts traditional multi-way valves to control the running speed of the actuators. The four sides of the hydraulic valves are linked, and the inlet and outlet are throttled at the same time. At the same time, only the pressure or flow of the single chamber of the actuator can be controlled. The controllability is poor and there is a throttling loss. Large, serious heating and other problems, especially in the overload condition, this problem is more serious. [0003] Aiming at the problems existing in the four-side linkage throttling control of the traditional multi-way valve, the existing solution is to adopt the method of independent control of the inlet and outlet, and use two three-position three-way v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B21/08F15B19/00F15B11/08F15B13/044
CPCF15B11/08F15B13/044F15B19/00F15B21/087F15B2013/0448
Inventor 权龙王波刘赫夏连鹏杨敬王鹤
Owner TAIYUAN UNIV OF TECH
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