Retractable support leg and engineering machine with same

Abstract

The invention discloses a retractable support leg, which comprises a fixed support leg (10) and a movable support leg (20). When the movable support leg (20) stretches in place, coincidence portions of the movable support leg (20) and the fixed support leg (10) which are nested mutually are positioned and connected by a movable hinge pin, both the movable support leg (20) and the fixed support leg (10) are provided with pin holes, a retractable cylinder (30) of the movable support leg (20) can slide within small displacement range along a stretching and retracting direction, and is provided with a transmission component, and the movable hinge pin is driven to be inserted or withdrawn from the pin holes via the transmission component when the retractable cylinder (30) slides. Coincidence lengths of the movable support leg and the fixed support leg of the support leg are shorter, spreading span of the support leg can be increased, stability of an integral vehicle can be further improved, simultaneously, a stressed manner of the support leg can be improved, and structural reliability is enhanced. The invention further discloses an engineering machine comprising the retractable support leg.

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.

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