The Principle of the Telescopic Arm of The Small Truck Crane
Lifting machinery is a common equipment in our daily life and production, truck crane is one of them.
The telescopic principle of boom of small truck crane:
I. There are several types of telescopic truck crane booms for automobile cranes:
1. Sequential telescopic mechanism– Each arm telescopes step by step in a certain order.
2. Synchronized telescopic mechanism– Each arm telescopes at the same relative speed.
3. Independent telescopic mechanism– Each arm can independently telescoping mechanism.
4. Combined telescopic mechanism– When the telescopic arm exceeds three sections, any two telescopic mechanisms listed above can be used simultaneously.
II. According to the technical points of telescopic mechanism, automobile cranes can be divided into pinless fully hydraulic telescopic mechanism and automatic plug-in telescopic mechanism.
The advantages of pinless fully hydraulic telescopic mechanism are that the arm length is easy to change, there are many kinds of working arm length, and its practicability is very strong. The disadvantage is self-importance, which has a great influence on the stability of the whole machine.
There are different combinations of pinless full hydraulic telescopic mechanism, which can be multi-cylinder plus one-stage rope row, single-cylinder or multi-cylinder plus two-stage rope row.
The characteristic of multi-cylinder plus one-stage rope row is that the last telescopic arm is telescoped by wire rope, and the other telescoping arms are telescoped directly by cylinder by means of multi-stage cylinder or single-stage cylinder or multi-stage cylinder or single-stage cylinder and single-stage cylinder liner. Therefore, the section of the final telescopic arm changes greatly, while the section of the other arm segments changes slightly.