Lorry-mounted crane multi-way reversing device and straight arm lorry-mounted crane

Abstract

The invention relates to a lorry-mounted crane multi-way reversing device and a straight arm lorry-mounted crane. The lorry-mounted crane multi-way reversing device comprises a main winch reversing valve, a telescopic reversing valve, a rotary reversing valve and an amplitude variation reversing valve, the amplitude variation reversing valve and the telescopic reversing valve are in parallel connection on an input oil way, the input oil way is connected with an external first quantitative oil pump, an input oil way of the rotary reversing valve is connected with an external second quantitative oil pump, wherein the input oil way of the rotary reserving valve and the input oil way of the amplitude variation reversing valve and the telescopic reversing valve converges to be in series connection with the main winch reversing valve on the input oil way, and a converge check valve is further arranged at the position before the converging point on the input oil way of the rotary reversing valve. According to the lorry-mounted crane multi-way reversing device and the straight arm lorry-mounted crane, the pre-valve converging control form can be achieved with low cost, and operation efficiency of the whole crane is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a multi-way reversing device for a truck-mounted crane and a straight-arm truck-mounted crane. 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, e...

AI Technical Summary

Problems solved by technology

[0006] 1. The winch control unit adopts the principle of confluence after the valve. The oil supplied by the small pump first passes through the reversing valve of the winch, and then merges with the oil supplied by the large pump. High energy consumption, resulting in low efficiency of vehicle operation;

[0007] 2. The winch reversing valve has a five-position and eight-way structure, with five working positions and eight oil ports. The operation stroke is long, the valve core adjustment stroke is short, and the oil circuit is complicated. It needs special manufacturing and has poor adjustment performance. , complex structure, poor versatility, high cost and difficult maintenance;

[0008] 3. There is no one-way valve on the oil supply side of the large pump of the reversing valve of the winch, which cannot prevent the backflow of hydraulic shock and weaken the reliability of the hydraulic control system;

[0009] 4. The dimensions and specifications of telescopic, luffing and slewing control links are the same, which cannot meet the contradiction that the flow required for telescopic and luffing of large-tonnage truck-mounted cranes is much greater than the flow required for slewing. The flow capacity of different reversing links is different. ;

[0010] 5. The multi-way reversing valve lacks additional actions, which cannot meet the needs of diversified markets;

[0011] 6. The luffing and telescopic control unit lacks auxiliary plug-ins, and there are problems such as poor motion stability and insufficient safety protection during the operation process, and the control performance needs to be improved

However, this confluence multi-way valve is a load-sensitive multi-way valve, and the confluence needs special hydraulic control components to control, the pilot oil circuit is complicated, and the cost is high, so it is not suitable for the market positioning of straight-arm truck-mounted cranes.

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