Cam type separated retractable pin mechanism for crane

Abstract

The present invention discloses a cam-type split telescopic pin mechanism for crane. It includes upper cover plate, slide plate, main body upper portion, telescopic pin, main body lower portion, reset spring, lower cover plate and connecting board. The main body upper portion and main body lower portion are connected to form telescopic pin mechanism main body. The main body upper portion and main body lower portion are positioned between upper cover plate and lower cover plate, the telescopic pin and the slide plate connected with one-way action cylinder by means of connecting board are mounted between the main body upper portion and main body lower portion, the pin shaft extended from two sides of the telescopic pin are respectively slide-set in the central cam groove of slide plate and curved groove cut on the telescopic pin mechanism self-body, the tail end of said telescopic pin is connected with a reset spring.

Description

technical field [0001] The invention mainly relates to the field of cranes, in particular to a cam type split telescopic pin 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, and the telescopi...

AI Technical Summary

Problems solved by technology

[0005] Due to the limitation of the size of the inner space of the boom, the existing bolt mechanism shares a main body part with the main body 103 of the telescopic pin device and the main body 110 of the insertion and extraction device carrying the pin (the main body of the device shown in Fig. 2 and Fig. 3 is the same main body) , the main body requires high dimensional accuracy, plus the piston rod 108 moves inside 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, and requires cutting-edge equipment and complicated processes. The quality can 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. If it is inside the boom 105 Problems occur, 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 the telescopic pin The piston rod 108 of 101 bears the load. After many times of reciprocating movement, 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. Plate 107 acts, because 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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