Hydraulic variable pump mechanical proportion controller and hydraulic variable pump

Abstract

The invention discloses a hydraulic variable pump and a hydraulic variable pump mechanical proportion controller thereof, and is used for controlling the flow and the pressure of a first piston cylinder and a second piston cylinder of a hydraulic pump inclined disc. The hydraulic variable pump comprises a feedback rod, a driving handle, a first reversing valve, a second reversing valve, and an electric control safety switch for selecting the first reversing valve or the second reversing valve to work. The first reversing valve is a mechanical proportion-controlled pilot valve for realizing equal-proportion control of the displacement of the hydraulic variable pump; and the second reversing valve is used as an unloading valve for unloading the hydraulic variable pump. The electric control switch valve is used as a selecting valve; a single-grade valve element is adopted as a pilot valve element to directly control the variable of the inclined disc; and a feedback structure is skillfullyadopted to realize stable displacement, so that the mechanical proportion control safety function is achieved, the effects of simple structure, low cost, high reliability and convenience to maintainare guaranteed, and important significance on improvement of the product quality competitiveness and the cost competitiveness is achieved.

Description

technical field [0001] The invention relates to the technical field of controllers for hydraulic variable pumps, in particular to a hydraulic variable pump and a mechanical proportional controller for the hydraulic variable pump. Background technique [0002] Linde Hydraulics currently has a hydraulic plunger pump mechanical controller with a safety switch in the following ways: figure 1 Shown: [0003] When the safety switch 02 is powered on, the hydraulic handle 01 drives the pressure rotary valve 03 to rotate, changing the pressure of the pilot oil source F leading to the pilot stage variable cylinder 05, thereby controlling the movement of the pilot spool 06 and changing the pressure leading to the hydraulic pump swash plate. Control piston cylinder A, control the flow and pressure of piston cylinder B, thereby changing the swing angle of the swash plate, and then changing the displacement of the hydraulic pump. The rotation of the swash plate indirectly drives the res...

AI Technical Summary

Problems solved by technology

[0004] Since the controller uses a pressure-rotating valve to control the pressure change of the pilot stage variable cylinder, thereby controlling the action of the pilot spool, and then controlling the displacement of the hydraulic pump, the structure of the two-stage variable is complicated, and the reliability of the control is low.

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