Synchronous control device of revolving speed of hydraulic walking mechanism engine and discharge of main pump

Abstract

The invention discloses a synchronous control device of revolving speed of a hydraulic walking mechanism engine and discharge of a main pump, belonging to the filed of mine and engineering machinery. The synchronous control device comprises a proportional pressure reducing valve, a main pump servo valve and an accelerator control cylinder, wherein a valve block is arranged between the proportional pressure reducing valve and the main pump servo valve; a shuttle valve and two throttle plugs are embedded into the pressure reducing valve. Two ends of the shuttle valve are respectively connected between an output port A and an output port B of the proportional pressure reducing valve. The proportional pressure reducing valve controls the servo valve of a variable pump through a throttle plug hole; an output pressure signal of the proportional pressure reducing valve at the left side or the right side is output to the accelerator control cylinder through the output port of the shuttle valve to control the stroke of an oil cylinder so as to control an accelerator of the engine. The synchronous control device disclosed by the invention has the advantages that a motor car can be operated to move forwards or backwards or to change speed by operating a discharge handle of the pump only; the revolving speed of the engine is automatically adjusted to match with the power requirement of the pump while the variable of the pump is controlled, and therefore the problem that the engine is suffocated and switched off due to mismatching between the discharge of the pump and the accelerator of the engine during starting the motor car can be prevented.

Description

technical field [0001] The invention belongs to the fields of mining machinery and engineering machinery, and in particular relates to a synchronous control device for engine speed and main pump displacement of hydraulic traveling machinery, which is mainly applicable to the control of mining hydraulic monorail locomotives and engineering machinery engines. Background technique [0002] The driving of mining hydraulic monorail locomotives is often controlled by a closed system oil pump driving a low-speed, high-torque hydraulic motor. Its driving speed and forward, reverse or stop depend on the change of the displacement of the main oil pump and the conversion of the flow output and input ports. . The speed of the engine is basically constant. When changing the speed of the engine, it is necessary to manually adjust the size of the throttle, which cannot realize the synchronous and coordinated control of the speed of the engine and the displacement of the variable hydraulic ...

AI Technical Summary

Problems solved by technology

The speed of the engine is basically constant. When changing the speed of the engine, it is necessary to manually adjust the size of the throttle. It is impossible to realize the synchronous and coordinated control of the engine speed and the displacement of the variable hydraulic pump.

Images