Work arm hydraulic system of high-altitude operation vehicle and high-altitude operation vehicle with the hydraulic system

Abstract

The invention discloses a work arm hydraulic system of a high-altitude operation vehicle. The hydraulic system comprises a working cylinder (1) and an operation valve (2), wherein the working cylinder (1) includes a rod cavity and a rodless cavity, which are respectively communicated with two working oil ports (A, B) of the operation valve (2), wherein the hydraulic system also includes a communication pipe (3) for communicating the rod cavity with the rodless cavity of the working cylinder (1) and an oil return pipe (4) in branch connection with the communication pipe and communication with an oil tank (5); a switch valve (6) and a check valve (7) are serially connected with the communication pipe (4); and the check valve (7) allows hydraulic oil to flow to the rod cavity of the working cylinder (1). The invention also discloses a high-altitude operation vehicle. The high-altitude operation vehicle comprises a work arm, and the abovementioned work arm hydraulic system of the high-altitude operation vehicle, wherein the work arm hydraulic system drives the work arm through the working cylinder (1). The hydraulic system can retract the work arm of the high-altitude operation vehicle rapidly by consuming less power so as to meet the requirement for the emergency state.

Description

technical field [0001] The invention relates to the field of hydraulic pressure, in particular to a working arm hydraulic system of an aerial work vehicle, and also relates to an aerial work vehicle with the hydraulic system. Background technique [0002] Vehicles working at heights (such as aerial ladder fire trucks with working buckets, or aerial work vehicles, etc.) encounter an emergency where the main oil supply system of the hydraulic system cannot work normally, such as engine failure, main oil supply pump failure, etc. , the emergency system is required to retract the working arm (such as the jib or ladder frame) of the aerial work vehicle. [0003] figure 1 The hydraulic system of the working arm of the existing high-altitude operation vehicle is shown by taking the aerial ladder fire truck as an example. Such as figure 1 As shown, the actuators of the hydraulic system include a telescopic cylinder 11, a luffing cylinder 12 and a rotary motor 13. The actuators ar...

AI Technical Summary

Problems solved by technology

[0004] 1. The battery power of the high-altitude operation vehicle is limited, and the working arm may not be fully retracted on the high-altitude operation vehicle that requires a relatively large flow rate; when the working arm is not fully retracted, it is impossible to get off the vehicle. Make the aerial work vehicle can only wait for the external power supply to supply power, if the situation is more urgent, it will cause adverse effects

[0005] 2. The power of the emergency oil pump itself is low and the flow rate is small, so it takes a long time to retract the working arm

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