A low-impact hydraulic circuit for multi-stage cylinder luffing motion
A hydraulic circuit, multi-stage cylinder technology, applied in the direction of fluid pressure actuation device, fluid pressure actuation system components, servo motors, etc., to reduce heat production, simplify hydraulic circuit, and ensure the effect of speed
Active Publication Date: 2020-06-16
BEIJING MECHANICAL EQUIP INST
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Problems solved by technology
[0004] In view of the above analysis, the present invention aims to provide a low-impact multi-stage cylinder luffing motion hydraulic circuit to improve the efficiency of the existing hydraulic circuit and solve the problem that the existing hydraulic circuit cannot handle multi-stage cylinders well. shock problem
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[0027] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.
[0028] The existing multi-stage cylinder hydraulic circuit usually adopts such as figure 1 The structure shown, that is, the oil source oil circuit 12 adopts a load-sensing sensitive pump, belongs to the second-generation shaping improvement after the fixed-pressure pump and the constant-pressure pump, and the load-sensing control module on the load-sensing pump 32 includes a series of integrated on the pump Control valve, the proportional directional valve controls the running direction and speed of the multi-stage cylinder 8. The high pressure behind the proportional directional valve is the...
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The invention relates to a low-impact multi-stage cylinder amplitude-variable motion hydraulic circuit, belongs to the field of amplitude-variable motion hydraulic circuits, and solves the problem that in the prior art, during stage changing of a multi-stage cylinder, motion impact can be generated. The multi-stage cylinder amplitude-variable motion hydraulic circuit comprises a vertical erectingand flatting oil circuit and an oil source oil circuit, wherein in the erecting and flatting oil circuit, the multi-stage oil cylinder is adopted to achieve erecting and flatting of a load; the oil-source oil circuit provides hydraulic power for the erecting and flatting oil circuit; in the oil-source oil circuit, a double-control variable displacement piston pump is adopted to pump hydraulic oilout, and the double-control variable displacement piston pump has an electrical proportional displacement working mode and a constant power working mode. By means of the low-impact multi-stage cylinder amplitude-variable motion hydraulic circuit, heating of a multi-stage cylinder amplitude-variable motion control circuit system can be reduced, and the system efficiency is improved; the impact, generated during stage changing of the multi-stage cylinder, of the multi-stage cylinder amplitude-variable motion is reduced.
Description
technical field [0001] The invention relates to the field of amplitude-changing hydraulic circuits, in particular to a low-impact multi-stage cylinder variable-amplifying hydraulic circuit. Background technique [0002] Based on the consideration of energy saving, the hydraulic pump in the hydraulic circuit of the luffing motion based on the multi-stage hydraulic cylinder of construction machinery and special vehicles generally chooses the load-sensitive axial piston pump. Compared with pump source systems such as constant-pressure variable pumps and quantitative pumps, load-sensing pumps have significant energy-saving effects. However, due to the pressure drop of load-sensing valves (mostly adjustable flow valves or proportional directional valves), there are still system failures when large flows pass through. energy loss. [0003] During the erecting process of the luffing erecting device based on multi-stage hydraulic cylinders, when the multi-stage hydraulic cylinders ...
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IPC IPC(8): F15B21/08F15B21/041F15B21/042F15B11/08F15B13/02
CPCF15B11/08F15B13/021F15B21/04F15B21/041F15B21/087
Inventor 苏晓岩王鹏飞付丙勤耿珧张春峰
Owner BEIJING MECHANICAL EQUIP INST