Brake micro-motion integrated control system of hydraulic transmission gearbox for forklift

Abstract

The invention discloses a braking and micro-motion integrated control system of a hydraulic transmission gearbox for a forklift truck. The braking and micro-motion integrated control system comprises a pedal plate, the gearbox, an electronic control unit and a proportional hydraulic control system; the pedal plate is connected with a forklift truck braking system; the forklift truck is provided with a position switch and a speed sensors or a displacement sensor, wherein the speed sensors or the displacement sensor is used for monitoring the motion condition of the pedal plate; when the position switch is detected to be stepped downward, the forklift truck braking system works and the stepped downward motion speed or motion stroke of the pedal plate is sampled through the electronic control unit; when the stepped downward motion speed or motion stroke of the pedal plate is larger than a set value, the gearbox is controlled by the electronic control unit to be shifted into the neutral gear; when the stepped downward motion speed or motion stroke of the pedal plate is smaller than a set value, the gearbox is controlled by the electronic control unit to be switched between the original gear and the neutral gear. According to the braking and micro-motion integrated control system of the hydraulic transmission gearbox for the forklift truck, the motion condition of the pedal plate is obtained through a braking and micro-motion integrated pedal plate structure and accordingly the driving intention of a driver is determined and the gearbox is controlled to execute the braking and micro-motion work.

Description

technical field [0001] The invention belongs to the field of material handling machinery, and in particular relates to a brake micro-motion integrated control system of a hydraulic transmission gearbox for a forklift. Background technique [0002] At present, hydraulic transmission gearboxes for forklifts generally use a hydraulic control circuit combined with electromagnetic reversing valves, buffer valves, and micro-motion valves, and cooperate with shift switches and other components to control the shifting process to form a gearbox control system. The control system has the following functions: Several defects: 1. The three-plate combination layout of inching pedal, brake pedal and accelerator pedal is adopted, which increases the complexity of driving operation; 2. The clutch engagement process is fixed and cannot adapt to changes in working conditions. When braking, a large amount of power is consumed on the hydraulic torque converter, which leads to an increase in oil...

AI Technical Summary

Problems solved by technology

[0002] At present, hydraulic transmission gearboxes for forklifts generally use a hydraulic control circuit combined with electromagnetic reversing valves, buffer valves, micro-movement valves, etc., and cooperate with shift switches and other components to control the shifting process to form a gearbox control system. The control system has the following functions: Several defects: 1. The three-plate combination layout of inching pedal, brake pedal and accelerator pedal is adopted, which increases the complexity of driving operation; 2. The clutch engagement process is fixed and cannot adapt to changes in working conditions. When braking, a large amount of power is consumed on the hydraulic torque converter, which leads to an increase in oil temperature, increased system energy consumption, and reduced life; 3. In many cases, the operator uses the inching pedal as a brake, and often presses the inching pedal for a long time Keeping the gearbox in a semi-linkage overload state for a long time will cause the friction plate to burn and the gearbox to be damaged

The above defects affect the performance and life of the gearbox, reducing its life

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