Engineering machinery and gear control device thereof

Abstract

The invention discloses a gear control device used for an engineering machinery. The gear control device comprises a gear selector, gear change electromagnetic valves and relays of which the number is the same with that of the gear change electromagnetic valves, wherein the control ends of the relays are respectively connected with the output branches at the output end of the gear selector, and the output ends of the relays are respectively connected with the controlled branches of the gear change electromagnetic valves. The device realizes the protection to the gear selector on the circuit, and can prevent the gear selector from the burning loss phenomenon in the use process, thereby avoiding the random-gear or zero-gear failure. The invention also discloses engineering machinery comprising the gear control device.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a gear control device for construction machinery. The present invention also relates to a construction machine comprising the above gear control device. Background technique [0002] Due to the complex operation objects of construction machinery, frequent shifting operations, and high labor intensity of the driver, the shifting operation of construction machinery is constantly developing in the direction of automation. [0003] The shift control system usually consists of a gear selector, a shift solenoid valve, a shift hydraulic system, and a shift clutch, among which the gear selector is a special electrical component used for reversing and shifting operations on the gearbox. [0004] The gear selector is equipped with a photoelectric coupler inside. When the operating handle is in different gears, the corresponding group control signal is output through logical...

AI Technical Summary

Problems solved by technology

[0010] Since the current of each output signal of the gear selector 1 must not exceed 0.5A, and the input of the gear selector 1 only when the current exceeds 3A, the insurance can work, and each of the above actual conditions will lead to the output of the faulty branch The current seriously exceeds the allowable range; in addition, the gear selector 1 directly controls the solenoid valve 2, and a self-induction current will be generated at the moment of shifting gears. At this time, the output current of the gear selector 1 seriously impacts its internal electrical components, causing burnout

[0011] This means that when the output signal of the gear selector directly controls the solenoid valve, the gear selector is easily burned due to the circuit failure of the controlled component, resulting in random gear or no gear failure, which not only affects the safe use and attendance of the equipment, but also It also brings technical difficulties to the maintenance personnel. If it is repaired, the burnout occurs in the circuit part inside the gear selector, so the maintenance is difficult. If it is replaced, the maintenance cost is too high due to the frequent burnout

[0012] Therefore, how to protect the gear selector on the circuit so as to avoid its burning during use, so as to avoid random gear or no gear failure, is a technical problem that those skilled in the art need to solve at present.

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