Two-way piston variable pump hydraulic control device
A control device, bidirectional variable technology, applied in the direction of fluid pressure actuation device, servo motor, servo motor assembly, etc., can solve the problems of crane shaking, short linear interval, reversal of plunger pump, crawling, etc., to avoid pressure shock , stable linear output, convenient effect of median adjustment
Active Publication Date: 2015-08-26
AVIC LIYUAN HYDRAULIC
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Problems solved by technology
However, when performing variable servo control, the control oil of the variable cylinder comes from the built-in gear pump, and the pressure of the variable cylinder suddenly changes from zero to the pressure of the gear pump; the linear range is short and the control is difficult, so the variable curve is in a state of steep increase or steep drop
In addition, when the variable cylinder returns to the neutral position, the opening of the valve core is not accurate enough due to uneven force, and the variable cylinder is prone to instantaneous negative pressure or pressure, which will cause the plunger pump to reverse and crawl in the neutral position.
When applied to crawler cranes, the crane will shake due to pressure fluctuations, resulting in inability to accurately control the crane during hoisting
Method used
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[0009] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0010] Such as figure 1 As shown: the two control oil ports 2 are respectively connected to the oil inlets 3 of the two pilot check valves 8, and the oil outlets 7 of the two pilot check valves 8 are respectively corresponding to the left and right chambers of the two-way variable cylinder 10 Communication; the shuttle valve 1 connected in parallel between the two control oil ports 2 communicates with the pilot oil port 6 of the two pilot check valves 8 respectively through its outlet, and the left chamber and the right chamber communicate with the oil pool through the reversing valve 4 respectively , the pressure chambers of the two reversing valves 4 are connected in parallel with the outlet of the shuttle valve 1.
[0011] In order to avoid oil return due to failure of reversing valve 4, resulting in damage to the entire system due to excessive o...
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The invention discloses a hydraulic control device of a bidirectional plunger variable pump, and belongs to hydraulic devices for controlling bidirectional plunger variable pumps. The control device can guarantee linear variation of variables outputted by the bidirectional plunger variable pump, comprises a bidirectional variable oil cylinder and is characterized in that two control oil ports (2) are respectively correspondingly communicated with a left cavity and a right cavity of the bidirectional variable oil cylinder (10) via pilot check valves (8), and a shuttle valve (1) which is connected between the two control oil ports (2) in parallel is respectively communicated with pilot oil ports (6) of the two pilot check valves (8); the left cavity and the right cavity are respectively communicated with an oil pool via reversing valves (4), and pressure cavities of the two reversing valves (4) are connected to an outlet of the shuttle valve (1) in parallel. The hydraulic control device has the advantages of stability in variable output, high reliability, convenience in neutral position adjustment and the like, and is used for controlling the bidirectional plunger variable pump.
Description
technical field [0001] The invention relates to a hydraulic control device, in particular to a hydraulic control device for a bidirectional plunger variable pump. Background technique [0002] As we all know, two-way variable displacement plunger pumps usually have three variable control methods: manual servo control, hydraulic servo control, and electric proportional servo control. However, when the variable servo control is performed, the control oil of the variable cylinder comes from the built-in gear pump, and the pressure of the variable cylinder changes from zero to the pressure of the gear pump; the linear range is short and the control is difficult, so the variable curve is in a state of steep increase or decrease. In addition, when the variable cylinder returns to the neutral position, the opening of the valve core is not accurate enough due to uneven force, and the variable cylinder is prone to instantaneous negative pressure or pressure, which causes the plunger ...
Claims
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IPC IPC(8): F15B11/08F15B13/042
Inventor 舒代雄罗成韦磊吴学江张兴越
Owner AVIC LIYUAN HYDRAULIC