Hydraulic circuit of the differential telescopic system and aerial work platform using hydraulic circuit of the differential telescopic system

Abstract

This invention discloses the hydraulic circuit of the differential telescopic system. The hydraulic circuit of the differential telescopic system includes the single solenoid valve (1), which passes through the balance valve without the rod cavity (2) and the balance valve with the rod cavity (3) connecting with the rod cavity of the telescopic cylinder (5) and the rodless cavity of the telescopic cylinder (5). The hydraulic check valve (4) is installed between the balance valve without the rod cavity (2) and the balance valve with the rod cavity (3). The controllable oil circuit I is formed between the balance valve without the rod cavity (2) and the hydraulic check valve (4). The controllable oil circuit II is formed between the balance valve with the rod cavity (3) and the hydraulic check valve (4). The hydraulic circuit of the differential telescopic system also includes the aerial work platform adopting the hydraulic circuit of the differential telescopic system. The hydraulic circuit of the differential telescopic system uses the single solenoid valve, which will not increase the difficulty of arranging the valve. The balance valve is the ordinary one, which can reduce the cost effectively. Meanwhile, the hydraulic control valve, which will automatically switch the differential function, can improve the telescopic efficiency. The full working process of this hydraulic circuit of the differential telescopic system will not pollute the air for the reason that there will be no leakage of the oil without hydraulic pressure.

Description

technical field [0001] The invention relates to a hydraulic circuit of a differential telescopic system and an aerial work platform using the circuit. Background technique [0002] If the boom of the aerial work platform wants to realize the telescopic function, it must be driven by the hydraulic cylinder. However, the rodless chamber of the general telescopic cylinder has a large volume. In order to ensure that the vehicle has a fast enough telescopic speed, it is necessary to choose a large flow. Oil pumps and control valves, and if the flow requirements for other actions of the vehicle are relatively small, it will cause waste of oil pump and engine power; [0003] At the same time, the selection of components with large flow rate will also increase the cost of the product. Therefore, in order to ensure a faster speed under the condition of small flow supply, a differential circuit is generally used, and the traditional differential control circuit requires a rod cavity b...

AI Technical Summary

Problems solved by technology

[0009] 1. Use double solenoid valves to switch, which will increase the difficulty of valve body layout. At the same time, an additional valve hole is required for valve body processing, which is not good for quality control. At the same time, double solenoid valves will increase the cost;

[0010] 2. The air-permeable balance valve must be selected, because the oil return of the rod chamber is connected with the oil inlet of the non-rod chamber during the extension process. At this time, the pressure of the two oil circuits is the same, and both are in a high-pressure state. The back pressure of the cavity is too high and the balance valve cannot be opened, so that the cylinder cannot operate

The high price of the air-permeable structure balance valve will lead to an increase in cost;

[0011] 3. Due to its own structure, the air-permeable balance valve will continuously leak hydraulic oil during use, which will pollute the use environment

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