Single-cylinder plug pin type telescopic arm, crane and telescoping method of single-cylinder plug pin type telescopic arm

Abstract

The invention relates to a single-cylinder plug pin type telescopic arm, a crane and a telescoping method of the single-cylinder plug pin type telescopic arm. The single-cylinder plug pin type telescopic arm comprises a basic arm and at least one section of telescopic arm which is sleeved in the basic arm, wherein coaxial central holes are formed in the tails of the telescopic arms; a telescopic oil cylinder is arranged in the central holes and comprises a cylinder rod and a cylinder barrel; at least two cylinder heads are fixedly sleeved outside the cylinder barrel in the longitudinal direction; at least three arm pin holes are respectively formed in the basic arm and the telescopic arm in the longitudinal direction. The single-cylinder plug pin type telescopic arm provided by the invention adopts the telescopic oil cylinder and the at least two cylinder heads; each cylinder head can be used for locking and unlocking the telescopic oil cylinder and any one telescopic arm; in a relay manner, the telescopic arms stretch or shrink; telescoping of the single-cylinder plug pin type telescopic arm is realized; the length of the oil cylinder is reduced; the cylinder diameter and the rod diameter of the oil cylinder are reduced; the cost of the oil cylinder is lowered; the loading weight is reduced; the hoisting capability is improved; the design capability of the crane is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a single-cylinder bolt-type telescopic arm, a crane including the single-cylinder bolt-type telescopic arm and a telescoping method for the single-cylinder bolt-type telescopic arm. Background technique [0002] The single-cylinder bolt system is a device built into the boom of the crane to realize the telescopic function of the boom. It is mainly composed of a telescopic boom and a telescopic oil cylinder, including the boom pin, the boom pin hole, the cylinder head, the cylinder pin, Cylinder rods, cylinder barrels, dovetail grooves, detection switches and other auxiliary facilities are the main functional components for the telescopic boom. The cylinder head is located at a certain position of the cylinder barrel or piston rod of the telescopic cylinder, and is used to control the device for fixing and separating the telescopic cylinder and the telescopic arm, mainly inclu...

AI Technical Summary

Problems solved by technology

This leads to a high cost of the oil cylinder, and the weight of the crane is too large, which indirectly leads to an increase in the weight of the chassis, which limits the lifting performance and approaches the minimum requirements of the national standard, which has a great impact on the product's competitive advantage.

[0008] 2. High cost

The stroke of the telescopic cylinder needs to meet the extension stroke of each telescopic arm, resulting in an excessively long stroke of the telescopic cylinder

It is difficult to process the cylinder rod and cylinder barrel of the long oil cylinder, which requires professional special processing equipment and processing conditions, resulting in a significant increase in the cost of the telescopic oil cylinder

[0009] 3. Heavy weight

Since the telescopic cylinder is too long and needs to bear a large axial compression load, in order to prevent the longitudinal bending of the telescopic cylinder and meet the stability requirements, a thicker cylinder rod diameter, bore diameter and material thickness are required, and a longer guide is required The distance increases the weight of the telescopic cylinder

At the same time, in order to meet the expansion and contraction of the large-stroke oil cylinder, it is necessary to configure a larger-sized oil tank, which will also increase the weight of the crane

[0010] Due to national traffic regulations, there are clear regulations on the weight of vehicles on the road, so the increase in weight will lead to more complex crane design, and the vehicle toll will also increase accordingly

[0011] 4. Poor stability

For long-stroke telescopic cylinders, after the cylinder rod is stretched out, due to its own weight, the connection between the cylinder rod and the cylinder barrel will be deflected downwards, resulting in an increase in the friction of the telescopic cylinder.

At the same time, affected by the elastic modulus of the hydraulic oil, the second half of the oil cylinder will stretch out, and there will be creeping and crawling, causing shaking

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