Telescopic arm and engineering machinery including the telescopic arm

Abstract

The invention discloses an engineering machine and a telescopic arm. The telescopic arm comprises a telescopic cylinder, a multi-section arm, a hydraulic system, at least one mechanical limit mechanism, a controller and a position sensor, wherein the movable end of the telescopic cylinder is telescopic in the extending direction of the telescopic arm; the hydraulic system is connected with the telescopic cylinder through a hydraulic oil circuit; the mechanical limit mechanism is matched with the movable end of the telescopic cylinder; the position sensor corresponds to the mechanical limit mechanism and is used for detecting the position of the movable end of the telescopic cylinder; and the controller outputs a control signal to a proportional control valve according to a predetermined strategy, so that the speed of the movable end of the telescopic cylinder is reduced. Through the technical scheme, the telescopic speed of the telescopic cylinder can be reduced according to the control signal, and the speed of the movable end is reduced to a low value or the movable end just stops at a position corresponding to the mechanical limit mechanism when the movable end arrives at the corresponding mechanical limit mechanism, so that collision impact between the movable end and the mechanical limit mechanism can be reduced or avoided.

Description

technical field [0001] The invention relates to a telescopic control technology, in particular to a telescopic arm, and also relates to a construction machine including the telescopic arm. Background technique [0002] Please refer to figure 1 , which is a schematic diagram of the working principle of the telescopic arm disclosed in Chinese patent document CN101585491A. The telescopic boom includes a bolt connection part, a rope row connection part and a telescopic cylinder 200 located in the last section of the telescopic boom. The bolt connection part comprises a base arm 110 and two arms 120 located in the base arm 110; the rope row connection part comprises three arms 130, four arms 140 and five arms 150 which are sequentially fitted together from outside to inside; wherein, the three arms 130 are set in Within the two arms 120; the third arm 130, the fourth arm 140 and the fifth arm 150 are connected by a rope row formed by a running wheel and a drag cable. The cylin...

AI Technical Summary

Problems solved by technology

[0004] In this way, the movable end 201 of the telescopic cylinder 200 mainly relies on the positioning of the mechanical limit mechanism, and when the movable end 201 reaches the position of the mechanical limit mechanism, it is easy to produce a collision impact with the mechanical limit mechanism; It will cause deformation of the mechanical limit mechanism and affect the accurate positioning of the cylinder rod 220; in severe cases, it will also cause damage to the mechanical limit mechanism and the telescopic cylinder

Severe collision impact will also loosen the arm pins between the joint arms, causing safety accidents

Images