Connecting rod type carrying pin inserting mechanism for crane

Abstract

The present invention discloses a link rod type load-bearing pin plug-in and draw-out mechanism for crane. It includes the following several portions: support abutment, pin-drawing boards, moving seat, spring reset mechanism and link mechanism, two pin-drawing boards are positioned at two sides of said support abutment, the moving seat connected with one-way action cylinder is movable mounted on the support abutment, the pin-drawing boards are connected with said moving seat by means of link mechanism, and the moving seat is connected with the spring reset mechanism.

Description

technical field [0001] The invention mainly relates to the field of cranes, in particular to a connecting rod-type load-bearing pin insertion mechanism for cranes. Background technique [0002] At present, large-tonnage and super-large-tonnage truck cranes at home and abroad generally use single-cylinder multi-section boom telescopic mechanisms. This type of telescopic mechanism is mainly composed of latch mechanisms, telescopic oil cylinders, bearing pins on the boom and other accessories. The latch mechanism is a key component of this type of telescopic mechanism. [0003] The latch mechanism is mainly composed of a retractable pin device and a plug-in device for carrying pins. Its main working principle can be illustrated by Figure 1. The telescopic pin device of the bolt mechanism and the insertion and extraction device of the bearing pin are marked in Fig. 1, and its working process is: 1. The movable end of the bolt mechanism and the telescopic oil cylinder is fixed, ...

AI Technical Summary

Problems solved by technology

[0005] Existing bolt mechanism is owing to be subjected to the restriction of boom 105 internal space size, telescopic pin device main body 103 and the insertion and extraction device main body 110 of bearing pin share a main body part (the main body of device shown in Fig. 2 and Fig. 3 is the same main body ), the dimensional accuracy of the main body is high, and the piston rod 108 moves in the main body, requiring a lot of sealing elements to be installed inside the main body, which makes the processing of the main body of the latch mechanism difficult, requiring cutting-edge equipment and complicated processes Only then can the quality be guaranteed; the bolt mechanism is fixed at the tail end of the telescopic oil cylinder, if the bolt mechanism needs to be disassembled, the piston rod of the telescopic oil cylinder must be pulled out from the cylinder, and then the next step can be carried out. There are internal problems, and the maintenance workload is very large; the telescopic pin 101 of the telescopic pin device is subjected to shear stress on the cross section. Since the telescopic pin 101 and the piston rod 108 are integrated, the stress is finally caused by the sealing element and telescopic The piston rod 108 of the pin 101 bears the load. After repeated back and forth movements, the sealing element and the piston rod 108 of the telescopic pin will be damaged, and problems such as hydraulic oil leakage and device jamming will occur. The plugging device for the bearing pin 106 has two oil cylinders for pulling out Due to the action of the pin plate 107, since the force is not on the same straight line, the piston rods 108 of the two oil cylinders will be subjected to partial load force, and problems such as card issuance and non-returning will occur

The above problems lead to unstable performance and low reliability of the bolt mechanism.

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