Retractable support leg and engineering machine with same

Abstract

The invention discloses a telescopic outrigger, which comprises a fixed outrigger (10) and a movable outrigger (20). The overlapping parts of the sleeves are positioned and connected by movable pins; the movable legs (20) and the fixed legs (10) are provided with pin holes, and the telescopic oil cylinder (30) of the movable legs (20) can move along the stretching direction. Small displacement sliding, the telescopic oil cylinder (30) is provided with a transmission part, and when sliding, the movable pin shaft is driven by the transmission part to insert or withdraw from the pin hole. The movable outrigger and the fixed outrigger of the outrigger have relatively short overlapping lengths, which can increase the spread span of the outrigger, further improve the stability of the vehicle, and improve the force bearing form of the outrigger and improve the reliability of the structure. The invention also discloses a construction machine provided with the telescopic outrigger.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to telescopic outriggers of construction machinery such as concrete pump trucks and cranes. The invention also relates to a construction machine provided with said telescopic outrigger. Background technique [0002] Concrete pump truck is a construction machine with the function of pumping concrete, which is used to deliver concrete to a designated location. [0003] In order to ensure sufficient safety and stability during work, that is, to ensure the safety factor of the whole machine against overturning, concrete pump trucks are generally equipped with telescopic outriggers so that the pump truck can be used without increasing the width of the pump truck. Provide a large support span, so as to increase its pumping capacity without reducing the maneuverability of the pump truck. [0004] The telescopic outriggers are mainly composed of fixed outriggers and movable...

AI Technical Summary

Problems solved by technology

[0008] In order to ensure the stability of the whole vehicle, the movable outrigger 2 of the pump truck usually needs to ensure a certain overlapping length L with the fixed outrigger 1 after being deployed. Since the value of L is relatively large, the movable outrigger 2 cannot be expanded to the maximum extent.

This overlapping connection method mainly has the following disadvantages: first, it cannot maximize the expansion space of the movable outrigger 2, which limits the improvement of the stability of the vehicle; At the same time, it must also bear torsion, and the force is mainly applied to the contact parts of the fixed outrigger door panel and the top and bottom panels. The local stress concentration is obvious, and cracking failures are prone to occur.

Images