Multi-path reversing device of lorry-mounted crane

Abstract

The invention discloses a multi-path reversing device of a lorry-mounted crane. The multi-path reversing device comprises an oil inlet oil path, an oil return port, an amplitude changing reversing valve used for operating three actions including ascending, stopping and descending of an amplitude changing oil cylinder, a telescopic reversing valve used for operating three actions including stretching out, stopping and contracting back of a telescopic oil cylinder, a winch reversing valve used for operating three actions including ascending, stopping and descending of a winch motor, and a rotation reversing valve used for operating three actions including the forward action, stopping and the reverse action of a rotation motor, and a functional module. The amplitude changing reversing valve and the telescopic reversing valve are connected with the two ends of the oil inlet oil path in parallel, the rotation reversing valve, the functional module and the oil inlet oil path are connected in series, and after being gathered, the telescopic reversing valve and the functional module are sequentially connected with the winch reversing valve and the oil return port in series. According to the device, five composite actions including amplitude changing and winching, amplitude changing and rotation, telescoping and winching, telescoping and rotation and rotation and winching are achieved, composite actions can be achieved without a proportional multi-path valve, cost is effectively reduced, and the cost performance of straight arm lorry-mounted cranes is improved.

Description

technical field [0001] The invention relates to a multi-way reversing device for a truck-mounted crane, which belongs to the technical field of engineering machinery. Background technique [0002] The truck-mounted crane is a multi-action machine that is installed on the chassis of a car and can load and unload heavy objects within a certain range. It is fast, flexible, efficient, convenient, and integrates loading, unloading, and transportation into one. Engineering, landscaping and equipment hoisting and transportation and other fields. According to the structural form, truck-mounted cranes can be divided into straight-arm truck-mounted cranes and folding-arm truck-mounted cranes. [0003] The straight-arm truck-mounted crane can extend or retract the boom through the telescopic oil cylinder of the boom, and the wire rope drawn from the hoisting mechanism can lift the cargo. The main actions include luffing, telescopic, hoisting and turning, etc. With the advantages of w...

AI Technical Summary

Problems solved by technology

However, when the hoist moves independently, the hoist reversing valve is always in a confluence state, and the continuous large-flow oil supply will greatly increase the difficulty of the operator's manipulation. The overflow returns oil, which also increases the heat generation of the system and the energy consumption of the whole vehicle;

[0007] 2. When the hoisting compound action is performed after the slewing action, since the oil return in the middle position of the slewing directional valve is through the one-way confluence valve, the hoisting directional valve to the oil return port of the multi-way valve, the hoisting action will cause the hoisting The pressure at the oil inlet port of the reversing valve increases, which leads to a corresponding increase in the pressure of the return port of the reversing reversing valve and the oil inlet port of the reversing reversing valve

This is the phenomenon of unstable slewing speed during the compound operation of slewing first and then hoisting, which has certain potential safety hazards.

[0008] Patent CN201110169262.7 proposes a multi-way reversing valve for straight-arm truck-mounted cranes and its control method, such as figure 2 As shown, although its hoisting action has a double-speed function, the hoisting reversing valve is a five-position, eight-way structure with five working positions and eight oil ports. The road is complex, requiring special manufacturing, and there are problems such as poor adjustment performance, complex structure, poor versatility, high cost, and difficult maintenance; at the same time, it also has the phenomenon of unstable slewing speed when turning first and then hoisting compound operation

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