a crane truss

Abstract

The invention discloses a crane truss which comprises rod pieces, connection stations and expansion joints, wherein the rod pieces, the connection stations and the expansion joints are in threaded connection to form a framed structure; the rod pieces comprise vertical rods, diagonal rods and horizontal rods; each connection station is provided with at least one threaded connector; the threaded connectors are arranged at the connective intersections of the rod pieces on the truss and used for connecting the intersecting rod pieces; the expansion joints are arranged between the rod pieces and the connection stations and are used for connecting the rod pieces and the connection stations when the axial space of connection of the rod pieces is limited. The rod pieces, the connection stations and the expansion joints are in threaded connection to form the framed structure, and threaded connection is adopted to replace welding, so that various defects of a crane truss manufactured by welding are eliminated, and quite remarkable effects of saving materials, eliminating welding pollution and coating pollution, reducing labor intensity, improving labor safety and sanitation, modularized and linearized production efficiency and internal and surface quality reliability of products, prolonging anti-corrosion life, facilitating logistics transportation and lowering manufacture cost are achieved.

Description

technical field [0001] The invention relates to a metal structural part of a hoisting machine, in particular to a crane truss. Background technique [0002] The box-type or truss-type metal structural parts of traditional lifting machinery are generally frame structures welded by section steel (angle steel, channel steel, I-beam, steel pipe, etc.) and steel plates. Its main force-bearing components are usually welded together with auxiliary structures such as walking platforms to form bridge-type or portal-type giant composite components. The above-mentioned giant composite components are mostly huge components with a length of tens of meters and complex structures. It has the following series of problems. [0003] 1. Labor safety issues [0004] 1. The forming of large metal structural parts of cranes is still mainly welded by hand. The welding workload is heavy, the labor intensity is high, and the forming of particularly large workpieces often requires open-air operati...

AI Technical Summary

Problems solved by technology

The welding workload is heavy, the labor intensity is high, and the forming of particularly large workpieces often requires open-air operations. The working conditions are poor, and the requirements for labor safety and health protection are higher. It is easy to cause work-related injuries such as electric shock, electrochemical spray corrosion, eye diseases, etc., and long-term poor construction. Posture can also cause corresponding occupational diseases

[0005] 2. Occupational safety problems caused by the extensive use of flammable and explosive gases in gas welding, gas cutting, flame correction and other processes

[0006] 3. The surface coating of large-scale components is still dominated by manual spraying of paint in the bulk cargo space. It is difficult to do harmless treatment of solvent gas and paint mist, and there is no effective protection condition for workers.

[0007] 2. Workpiece quality and quality management issues

[0008] 1. Due to the uneven welding level of welders, the quality of welds is not uniform, and there are generally hidden quality risks

[0009] 2. Due to the large amount of welding, the welding stress is serious, and the workpiece is huge, the means of stress relief treatment is very limited or there is no stress relief treatment at all

Therefore, the residual stress is generally serious, and there will be serious problems such as serious deformation of components, cracking of welds, and fracture of components after use.

[0010] 3. Because there are too many spliced ​​welds, various forms, and many hidden parts, the inspection workload is heavy

And some welds are difficult to detect with general means

In order to eliminate potential safety hazards, redundant technical conditions can only be relied on to ensure the strength of components. Slight management omissions and improper technical handling may lead to vicious safety accidents due to hidden product safety hazards

[0011] 4. Due to the huge workpiece, complex shape, and many auxiliary structures, the surface rust removal and coating methods are very limited, and the coating quality is poor

[0012] 3. Productivity and production cost issues

Both production workers and management personnel must have many years of technical experience and management experience to be competent, and the working conditions are poor, dirty, bitter, and tiring. The source of such workers is becoming increasingly scarce, and they are facing the danger of breaking generations, resulting in the proportion of wage costs Higher and higher

[0014] 2. Due to the large workpiece and long production cycle, the production and inventory occupy a large area, and the factory output rate is low

[0015] 4. Other defects

[0016] 1. The surface shape of the components is complex, and the gaps and puddles of the whole body bring troubles to anti-corrosion maintenance after use, which greatly affects the service life

[0017] 2. The whole body of the component is spread all over the stressed nodes. For a large number of zero-miscellaneous gap welds of different forms, it is impossible to carry out standard inspections and can only be observed with the naked eye, so quality hidden dangers are unavoidable

[0018] 3. The main stress-bearing nodes of metal structural parts of traditional truss cranes are generally composed of joint steel plate lap steel, and the joints are weld concentration areas. Due to a large amount of welding stress and incomplete weld inspection, the weld cracks after use Damage caused serious accidents occurred frequently

[0019] 4. Due to the limitations of the section characteristics of the section steel, the calculation of the force system is complicated, and it is difficult to perfectly unify the material and design concept

After the product is put into use, the twist is large and the rigidity is insufficient, which will eventually shorten the service life of the product

[0020] 5. The transportation cost of tens of meters long and heavy components is huge, and the requirements for roads and installation site conditions are high

It restricts the long-distance coverage and radiation of the manufacturer's products, and the bulk price of exported products is expensive

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