Load-sensing hydraulic system with controllable limit displacement of oil pump, control method and construction machinery
A load-sensing, hydraulic system technology, applied in the direction of pump control, liquid variable capacity machinery, mechanical equipment, etc., can solve the problems of hydraulic system matching adjustment, inability to achieve accurate matching of oil pump limit displacement, and inflexible control mode control
Active Publication Date: 2022-06-07
XUZHOU HEAVY MASCH CO LTD
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Problems solved by technology
[0003] The limit displacement control method of the related oil pump is to control the load sensitive system through constant power or variable power. Among them, the constant power control method cannot match and adjust the hydraulic system according to the working conditions of the engine; and the variable power control method has control problems. Flexible, and it is impossible to precisely match the limit displacement of the oil pump with the engine speed
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[0062] The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0063] In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or ...
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The invention relates to a load sensitive hydraulic system with controllable limit displacement of an oil pump, a control method and engineering machinery. Wherein, the load-sensing hydraulic system with controllable limit displacement of the oil pump includes: a load-sensing variable pump, including a variable mechanism and an oil pump, and the variable mechanism is connected to the oil pump; and a control mechanism, operatively connected to the variable mechanism, the The control mechanism is configured to operatively control the variable mechanism according to working conditions, so as to adjust the limit displacement of the oil pump through the variable mechanism. The present invention can realize that in the load sensitive system, the limit displacement of the oil pump can be adjusted arbitrarily within the adjustable range according to the needs of working conditions.
Description
technical field [0001] The invention relates to the field of construction machinery, in particular to a load-sensitive hydraulic system with controllable limit displacement of an oil pump, a control method and construction machinery. Background technique [0002] The hydraulic system of the crane is responsible for the transmission of power and the speed control and regulation of the crane's hoisting, luffing, and telescopic movements. At present, load-sensing technology is generally used in small and medium-tonnage cranes, which has the advantages of stable and reliable system and good control performance. With the rapid development of the hydraulic system technology of wheeled cranes, especially in the context of increasing fuel costs, the method of optimizing the matching of hydraulic system and engine power of wheeled cranes to achieve energy saving has received more and more attention. To upgrade the load-sensing system, on the basis of maintaining the good performance ...
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IPC IPC(8): F15B11/02F15B11/028F15B11/042F04B49/00
CPCF15B11/02F15B11/028F15B11/0423F04B49/002F04B49/005
Inventor 单增海焦国旺周彬朱双双
Owner XUZHOU HEAVY MASCH CO LTD