Single-cylinder bolt telescopic device and crane

Abstract

The invention relates to a single-cylinder bolt stretching device and a crane. The single-cylinder bolt stretching device is applied to a stretching arm system, and comprises a stretching oil cylinder, a double-arm bolt structure, an arm bolt pulling and inserting mechanism, cylinder bolt structures and cylinder bolt oil cylinders, wherein the stretching oil cylinder is used for driving each stretching arm in a stretching arm system to do stretching motion relative to a basic arm; the double-arm bolt structure is arranged on two sides at the tail part of each stretching arm, and is used for locking and unlocking the stretching arms; the arm bolt pulling and inserting mechanism is arranged on the cylinder barrel of the stretching oil cylinder and is used for pulling and inserting the double-arm bolt structure; and the cylinder bolt structures and the cylinder bolt oil cylinders are arranged on the cylinder barrel of the stretching oil cylinder and are used for locking and unlocking the cylinder barrel of the stretching oil cylinder and each stretching arm. According to the invention, the double-arm bolt structures arranged at two sides of the tail part of each stretching arm are adopted, compared with the existing upper arm bolt scheme, the double-arm bolt structures provided by the invention are arranged at two sides of the stretching arm, are more uniform in stress than the structure arranged on the upper side of a suspending arm, so that the influences of flexibility deformation of a crane arm on the bolt hole position and the arm bolt stress situation are reduced.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a single-cylinder latch expansion device and a crane. Background technique [0002] In the boom telescopic system of a crane with more than six booms, the single-cylinder bolt telescopic device is generally used at present because the application of the rope row mechanism is relatively complicated. The so-called single-cylinder bolt telescopic mechanism is a mechanism that uses a single telescopic oil cylinder to realize the expansion and contraction of the boom, and the extension and retraction of the boom are realized through the cooperation of the cylinder and the arm pin. [0003] At present, the existing single-cylinder bolt telescopic mechanism mainly adopts the upper arm pin scheme, that is, install an arm pin on the upper part of each arm in addition to the basic arm, and use two arm pin oil cylinders to drive the T-shaped slot to move up and down to realize the arm p...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing single-cylinder bolt telescopic mechanism mainly adopts the upper arm pin scheme, that is, install an arm pin on the upper part of each arm in addition to the basic arm, and use two arm pin oil cylinders to drive the T-shaped slot to move up and down to realize the arm pin insertion. The two arm pin cylinders are symmetrically distributed on the head of the T-slot. Due to space constraints, there is a certain distance between the action point of the oil cylinder and the stress point of the T-slot, that is, there is a certain eccentric load moment, which causes the arm pin cylinder to withstand eccentricity. When the arm pin oil cylinder works under the partial load for a long time, the seal will be worn, crushed and leaked.

[0004] When the deflection and deformation of the boom is relatively large in the existing single-cylinder bolt telescopic mechanism, the pin hole of the boom arm is deformed due to the deflection of the boom. This will cause difficulty in extracting and inserting the arm pin or failure in extracting and inserting the arm pin due to inaccurate release position of the arm pin.

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