Mobile cranes and their outrigger fixtures

Abstract

The invention discloses a mobile crane and a supporting leg fixing device thereof. The supporting leg fixing device is simple in structure and convenient to operate. The supporting leg fixing device comprises a bracket which extends out of a frame and stoppers arranged on the bracket, wherein the stoppers are stopped on the outer side of a supporting leg cylinder ball after a supporting leg is retracted; the tops of the stoppers can move up and down, so that the supporting leg cylinder ball can move inwards and outwards. An operator can control the stoppers from the outer side of the frame, the whole operating space is large, and the operation position does not interfere with a cargo boom on the inner side of the frame, so that smooth operation is realized. When the supporting leg needs to extend out or retract, the stoppers can be moved downwards, so that the supporting leg cylinder ball can be smoothly moved outwards or retracted; after the supporting leg is retracted, the stoppers can be fixed after being moved upwards, so as to be stopped on the outer side of the supporting leg cylinder ball, and a phenomenon that the stoppers are moved outwards due to reasons such as vibration of the frame is avoided, so that the supporting leg is effectively fixed and is prevented from swinging outwards in a vehicle traveling process.

Description

technical field [0001] The invention relates to the technical field of hoisting machinery, in particular to a leg fixing device of a mobile crane. The invention also relates to a mobile crane with the above-mentioned outrigger fixing device. Background technique [0002] Please refer to figure 1 and figure 2 , figure 1 It is a schematic diagram of the state when the outriggers of the mobile crane in the prior art are stretched out; figure 2 It is a schematic diagram of the state when the outriggers of the mobile crane are retracted in the prior art. [0003] The mobile cranes in the prior art are generally equipped with four retractable movable legs. When carrying out lifting operations, the four legs reach a fully extended state to support the entire crane and bear the full weight of the crane during the lifting operation. ,Such as figure 1 shown; when the crane is moving, it is necessary to retract all the movable outriggers so as not to hinder the movement of the ...

AI Technical Summary

Problems solved by technology

[0009] First, if image 3 As shown, the fixing pin 2' is inserted into the inner side of the outrigger 1'. When the outrigger needs to be fixed or released, the operator needs to operate in the middle of the outriggers on both sides; however, the middle of the crane is used to place the lifting Arm, the operating position interferes with the lifting arm, so the operating space is limited, which affects the convenience of operation

[0010] Secondly, using the fixed pin 2' for locking, it is necessary to weld the bracket 3' and the support 4' on the movable leg 1' and the frame 5' respectively, and install the fixed pin 2' on the bracket 3'. Many parts and complex structure

[0011] Again, the above method requires the pin hole on the support 4' to be aligned with the hole on the bracket 3' for penetrating the fixing pin 2'. Since the two holes themselves and their mutual cooperation require high dimensional accuracy, and the gap between the two There are too many dimensional chain factors, so it must be processed by matching welding, which leads to a more complicated process; moreover, due to the deformation or partial damage of the equipment during use, it is difficult to ensure that the two holes remain centered

[0012] Finally, in the driving state, the fixing pin 2' on the leg 1' is easily stuck in the locking hole, making it difficult to disassemble

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