Plunger pump composite control regulator and hoisting machine

Abstract

The invention discloses a plunger pump composite control regulator. The plunger pump composite control regulator comprises a variable power control valve and a variable pressure difference control valve which communicate with each other. The variable power control valve communicates with a variable pump, and the variable pressure difference control valve communicates with a hydraulic system. The variable power control valve comprises a power proportion electromagnet, a power spring and a power valve element. The variable pressure difference control valve comprises a pressure difference proportion electromagnet, a pressure difference spring and a constant flow valve element. A set current signal value is input into the power proportion electromagnet and the pressure difference proportion electromagnet, the thrust of the power proportion electromagnet, the thrust of the power spring and the thrust of a guide wheel mechanism are balanced, and therefore the position of the power valve element is adjusted; and the thrust of the pressure difference proportion electromagnet, the thrust of the pressure difference spring and the hydraulic pressure of the system are balanced so as to adjustthe position of the constant flow valve element. The problem that flameout is likely to happen under the low-rotating-speed working condition is effectively solved, the problem that high-rotating-speed torque is not fully utilized is effectively solved, the composite action coordination is improved, and the operation efficiency is improved. The invention further discloses a hoisting machine comprising the regulator.

Description

technical field [0001] The invention relates to the field of engineering equipment, in particular to a composite control regulator for a plunger pump. In addition, the present invention also relates to a hoisting machine comprising the above-mentioned adjuster. Background technique [0002] In the existing hydraulic control system of hoisting machinery, under different working conditions, there are load differences and flow demand differences in each action of the main engine, which makes the flow and pressure output by the plunger pump unable to meet the system requirements in a timely manner. The torque of the engine is not constant under different speed conditions, please refer to Figure 7 , Figure 7 For the engine characteristic curve of a specific embodiment of the plunger pump composite control regulator provided by the present invention, the traditional constant torque regulator cannot adapt to the engine torque characteristic requirements. [0003] As the matching...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a composite control regulator for plunger pumps, through variable power control valves and variable pressure difference control valves, to solve the problem of inconsistency between the load flow demand and the actual working condition demand caused by the invariable pressure difference of the hydraulic system, and at the same time Solved the problem that the engine is easy to stall at low speed and the torque is underutilized at high speed

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