Servo control variable piston pump and control method thereof

Abstract

A servo control variable piston pump comprises a shell. A valve body is installed at the lower end of the shell. An oil supplementary pump is installed on the valve body in a fastened mode. A transmission flange is installed at the upper end of a driving shaft. The middle of the driving shaft is installed inside the shell through a ball bearing in a supported mode. The lower end of the driving shaft is installed inside a sliding bearing. The sliding bearing is installed inside the valve body. A bottom crescent bearing and a top crescent bearing for installation of a swash plate are arranged on the shell. A piston assembly is pressed on the swash plate through a pressure plate. An oil distribution disc is installed on the valve body. A cylinder body is pressed on the oil distribution disc. A variable cylinder body is installed inside the shell. A center shaft penetrates through the variable cylinder body. A reset assembly is arranged at the right end of an inner cavity of the variable cylinder body. A sliding block is arranged on one side of the reset assembly so that the swash plate can be prevented from being inclined. A servo control valve is installed on the shell. The displacement can be changed in real time by controlling the servo control valve, so that the operating difficulty is effectively lowered, and the various system requirements are met; in addition, a safety control device is further arranged on the valve body and used for overload protection during oil pumping.

Description

technical field [0001] The invention relates to the technical field of plunger pump control, in particular to a servo-controlled variable plunger pump and a control method thereof. Background technique [0002] As the most critical power component of the hydraulic system, the performance of the hydraulic pump directly affects the characteristics of the entire hydraulic system. The current constant pressure variable pump is not only complex in system, but also difficult to control; at the same time, the variable cylinder maintains relatively poor static characteristics without external manipulation, so that the hydraulic pump cannot stop pumping oil in time and is in a zero position; while the variable cylinder The internal components need to be lubricated after running for a long time to maintain normal operation. If the lubrication function is added to the existing plunger pump, the production cost will increase, and the load on the hydraulic pump will also be increased, an...

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Problems solved by technology

The current constant-pressure variable pump is not only complex in system, but also difficult to control; at the same time, the variable cylinder maintains relatively poor static characteristics without external manipulation, so that the hydraulic pump cannot stop pumping oil in time and is in a zero position; while the variable cylinder The internal components need to be lubricated after long-term operation to maintain normal operation. If the lubrication function is added to the existing plunger pump, the production cost will increase, and the load on the hydraulic pump will also be increased, and because the hydraulic pump converts mechanical energy For hydraulic energy, the pump body is prone to overload during operation, and how to improve safety performance is also a problem that cannot be ignored; the existing plunger pumps have low integration and poor flexible application characteristics in the system, which cannot meet the needs of modern highly integrated systems.

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