The general on-board crane truck has the following functional requirements:
1. The crane can be easily transferred with the car to meet the requirements of its field operations maneuver, flexible, do not need to be equipped with power.
2. When the truck is lifted by the truck to carry out lifting work, the leg mechanism can lift the whole vehicle, so that all the tires of the vehicle can be lifted off the ground, and the direct load of the lifting load can be avoided, and the supporting state of the hydraulic legs can be long. Keep the position unchanged to prevent soft legs when lifting heavy objects.
3. The length and depressing angle of the boom can be arbitrarily adjusted and balanced in a certain range to meet different lifting operation requirements.
4. The lifting crane of the lorry crane can rotate and lock within 360 degrees.
5. Make the lifting gear of the on-board crane truck lift up and down within a certain speed range, and it can stop at any position. There is no car-slipping phenomenon during load-starting.

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