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 obtained through figure 1 to illustrate. figure 1 The telescopic pin device of the latch mechanism and the insertion and extraction device of the bearing pin are marked in the middle. The working process is: 1. The movable end of the latch mechanism and the telescopic oil cylinder...

AI Technical Summary

Problems solved by technology

[0005] Existing bolt mechanism is owing to be subjected to the limitation of boom interior space size, telescopic pin device main body 103 and the insertion and extraction device main body 110 of carrying pin share a main body part ( figure 2 and image 3 The main body of the shown device 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 , cutting-edge equipment and complex processes are required to ensure quality; 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 In the next step, if there is a problem inside the boom 105, the maintenance workload will be very large; the telescopic pin 101 of the telescopic pin device is subject to the shear stress on the cross section, because the telescopic pin 101 and the piston rod 108 are integrated , the stress is finally borne by the sealing element and the piston rod 108 of the telescopic pin 101. After repeated reciprocating movements, the sealing element and the piston rod 108 of the telescopic pin will be damaged, causing problems such as hydraulic oil leakage and device being stuck. The plug-in device has two oil cylinders that act on the pin-pull plate 107. Since the forces are not on the same straight line, the piston rods 108 of the two oil cylinders will be subjected to partial loads, causing problems such as card issuance and non-returning.

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

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