Cylinder pin seat, telescopic boom and construction machinery

Abstract

The invention discloses a cylinder pin seat. The cylinder pin seat comprises an insertion base (1) provided with a pin hole (11) which allows a cylinder pin (61) to be inserted, and a limiting bracket provided with a supporting part (32), wherein the supporting part (32) elastically supports the insertion base (1) to enable the insertion base (1) to move along a moving direction of a plug pin mechanism (6) relative to the limiting bracket. The invention also discloses a telescopic boom comprising a plurality of boom sections, wherein each boom section is provided with the cylinder pin seat, and the limiting bracket is fixedly connected to each boom section. The invention also discloses an engineering machine comprising the telescopic boom. According to the cylinder pin seat, the telescopic boom and the engineering machine disclosed by the invention, the elastic adjustment capability of the cylinder pin seat can be improved, so that the plug matching between a cylinder pin and the cylinder pin seat is convenient, fast and reliable, and the contact area between the cylinder pin and the cylinder pin seat is increased, so that the structural damage caused by inaccurate positioning, blocking of the cylinder pin and rigid plug can be effectively avoided.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a cylinder pin seat, a telescopic boom and construction machinery. Background technique [0002] The latch mechanism is a telescopic drive structure of the telescopic boom. [0003] attached figure 1 And attached figure 2 Shown in is a structural schematic diagram of the latch mechanism and the tail of the boom section in the prior art. The latch mechanism 6 is arranged inside the telescopic arm, and the latch mechanism 6 is provided with a cylinder pin 61 capable of extending and retracting. The cylinder pin seat is arranged at the tail part 7 of each boom section. When the telescopic boom needs to be unfolded, the latch mechanism 6 moves and approaches the tail portion 7 of the first boom section, and under the power provided by the mechanism, the cylinder pin 61 stretches out and is inserted into the pin hole 11 of the first boom section. Then, driven by the latch m...

AI Technical Summary

Problems solved by technology

[0005] However, the arrangement in the prior art has at least the following disadvantages: First, in order to ensure the contact area between the cylinder pin 61 and the inner wall of the pin hole 11, the end of the pin hole 11 cannot be provided with a guide surface, and the cylinder pin 61 and the pin hole 11. The gap on the inner wall should not be too large, which often causes misalignment of the cylinder pin 61 and the pin hole 11 during operation; secondly, the spring mechanism arranged on the cylinder pin seat is complicated, and multiple sets of springs are adjusted by straight pull. type, and it is a high-strength spring (because the moment arm is short, a spring with a large elastic force must be selected to meet the functional requirements), resulting in inconvenient installation and easy damage to the parts; third, after the cylinder pin seat is installed, it is inconvenient to adjust; Fourth, since the cylinder pin 61 and the pin hole 11 are arranged in a rectangular cross-section, it is easy to have a rigid fit between the corners during use, and there is a phenomenon of plugging and jamming

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