Variable displacement piston pump system for hydraulic machine

Abstract

The invention discloses a variable displacement piston pump system for a hydraulic machine. The variable displacement piston pump system comprises a pressure selection solenoid valve, a micro-control solenoid valve, a high pressure overflow valve, a low pressure overflow valve, a large displacement control cylinder, a small displacement control cylinder, a piston pump with a variable inclination swash plate, a check valve, a solenoid directional valve, a hydraulic control one-way valve, an oil cylinder, a pressure gage and a pressure gage switch. Oil lines of the pressure selection solenoid valve, the micro-control solenoid valve, the high pressure overflow valve, the low pressure overflow valve, the large displacement control cylinder, the small displacement control cylinder, and the piston pump with the variable inclination swash plate are connected with a mechanical mechanism to be integrated into a whole. The variable displacement piston pump system has low structure cost, the displacement and pressure can be easily set manually and controlled by a circuit, automation is easy to realize, the whole structure is compact, the volume is small, and the system has constant pressure and micro-pressure micro-displacement functions, is safe and stable and low in noise, generates less heat and has obvious energy-saving effect.

Description

technical field [0001] The invention relates to a variable displacement plunger pump system of a hydraulic press, in particular to a volume variable control system of the plunger pump of a hydraulic press. Background technique [0002] At present, domestic hydraulic machines are widely used. All kinds of hydraulic control systems used on the machine are powered by hydraulic pumps to deliver pressure oil to the oil circuit system, and then through (reversing valves, overflow valves, throttle valves, etc.) Control to realize the up and down movement of the oil cylinder. For example, in the existing (double cylinder system, double pump system, differential pressure system, etc.), these control valves (overflow valve, throttle valve, reversing valve, etc.) are mostly arranged on the main oil circuit, with complex structure, large volume, and different The existence of a certain degree of loss of hydraulic power leads to high energy consumption, high heat generation, high noise,...

AI Technical Summary

Problems solved by technology

For example, in the existing (double cylinder system, double pump system, differential pressure system, etc.), these control valves (overflow valve, throttle valve, reversing valve, etc.) are mostly arranged on the main oil circuit, with complex structure, large volume, and different The existence of a certain degree of loss of hydraulic power leads to high energy consumption, high heat generation, high noise, and low integration. It is impossible to combine the system and the pump into an integrated system. When forming a system, there are many connecting pipelines, high cost, and high failure rate.

Images