Concrete pump truck and arm frame connecting mechanism thereof

Abstract

The invention discloses a concrete pump truck and an arm frame connecting mechanism of the concrete pump truck. The arm frame connecting mechanism comprises a first extensible oil cylinder, a rotating platform and an arm frame hinged to the rotating platform, wherein the two ends of the first extensible oil cylinder are hinged to the rotating platform and the arm frame respectively. The arm frame connecting mechanism further comprises a connecting rod and an extensible mechanism, wherein a first hinge point and a second hinge point are arranged on the connecting rod, the first hinge point is hinged to the rotating platform, the second hinge point is hinged to the arm frame, one end of the extensible mechanism is hinged to the connecting rod, the other end of the extensible mechanism is hinged to the rotating platform, and the extensible mechanism is used for driving the second hinge point to rotate around the first hinge point. Due to the fact that the hinge point of the arm frame and the connecting rod can move, the rotating platform can achieve switching of two structural types, namely, the alignment non-backward bending structural type and the backward bending eccentric structural type, the large long bridge ratio of the arm frame connecting mechanism can be achieved, it can also be ensured that force is well exerted on the rotating platform, and potential safety hazards are reduced.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a concrete pump truck and its boom connection mechanism. Background technique [0002] Concrete pump trucks generally include a pumping mechanism integrated on the chassis, a slewing mechanism, a boom connection mechanism, and a boom. Wherein, the boom connection mechanism includes a turntable, and one end of the boom is hinged on the turntable. With the updating and progress of technology, many concrete equipment companies are focusing on the development of large-length-axle ratio pump trucks, such as 3-bridge 50m, 4-bridge 60m, 5-bridge 66m and other large-length-bridge ratio pump trucks have become products that companies are vying to develop. Compared with the pump truck, the large long bridge has the advantages of fewer bridges, light weight, good passability, and low cost. [0003] At present, the turntable of the concrete pump truck mainly has two structural forms: c...

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Problems solved by technology

[0003] At present, the turntable of the concrete pump truck mainly has two structural forms: centering non-backward and backward eccentric. The characteristic of the centering non-backward structure turntable is that the hinge point of the boom and the turntable is always located on the rotation center line of the turntable. The force on the turntable of the structure is relatively uniform, but considering the cost of the chassis, it is not conducive to the layout of the boom, especially it is difficult to achieve a large length-to-bridge ratio; The center line of the slewing is biased toward the front of the concrete pump truck. The turntable of this structure can achieve a large-to-bridge ratio pump truck, but the force on the turntable of this structure is very uneven, and cracking and bolt breakage are prone to occur, posing safety hazards

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