Standard joint group pair welding

Dongguan Sanwei Company has obtained the national invention patent for this product, patent number: CN201611028762.8

2. Introduction of welding tooling for section arm truss

     The welding fixture of the section arm truss is 20 meters long, 3 meters wide and 3 meters high. It consists of left and right positioning bent plates (fixed backing and movable backing), basic rails, fine-tuning mechanism, intermediate auxiliary support U-shaped square box, V-shaped support block assembly, male and female joint connection seat, positioning pin, quick locking pin, (with compensation screw) clamp, etc. In addition to the advantages of the general three-dimensional welding combined fixture system, this fixture also has the following characteristics:

(1) High flexibility. The tooling can meet the welding of any standard length boom and truss with a maximum cross-section of 2800x2800mm. The tooling can be quickly interchanged by simply replacing the corresponding male and female connectors. At the same time, the positioning section can be expanded by connecting auxiliary parts on the three sides to meet the positioning welding of the boom truss with larger cross-section sizes.

(2) High precision. Each component module of the tooling system has high processing accuracy. The flatness error of the 4-meter-long and 2-meter-wide working platform is within 0.15mm, the position error of the positioning hole is within ±0.05, and the verticality and parallelism of the fixture support surface are 0.05/1000mm.

(3) Repeatability. Using the CAD design system, it is very convenient to simulate the assembly of samples. The precise module size ensures assembly accuracy and saves product development time and cost.

3. Application of flexible combination tooling

     The boom truss is an important part of crawler cranes. The largest lifting tonnage in China is 4,200 tons. There are more than a dozen specifications ranging from 50 tons to 4,200 tons. Due to market needs, the arm lengths of cranes vary, so each specification of boom extension boom usually has four specifications of 3, 6, 9 and 12 meters. In addition to the number of upper and lower booms, the general manufacturer has dozens or even hundreds of boom varieties. Although there are many sizes and specifications, their appearances are completely similar. If the company makes a set of corresponding welding positioning tooling for each specification during the production process of the boom truss, you can imagine how huge the investment in process equipment is. If this set of tooling is available, a large amount of tooling cost investment can be saved, including the cost of tooling site occupation. The tooling has been widely used in engineering machinery companies such as Sany, XCMG, Liugong, Yutong, and Foton Lovol Heavy Industry.

The process flow of welding the boom (truss) on this tooling is as follows:

1). Single fan pairing

2). Assembly pairing

    

The left end of the assembly tool is fixed, and the right end can be moved to any position within the specified range through the motor, gear rack. The tool is equipped with a high-performance position measurement system (single axis) to facilitate position adjustment and accurate reading between the two supports during use.

Welding site:

  

4. Conclusion

     Dongguan Sanwei Equipment's welding combination fixture system has the following features in the welding of section boom trusses:

    1) Wide application: Due to the high precision of Sanwei Equipment's flexible welding fixture system , various booms of different tonnages, lengths and sizes can be completed in one system; with suitable joint brackets, production and management personnel can operate quickly and conveniently.

    2) Save space: Since the segmented arm truss belongs to large-scale welding production, it often requires a large space. After using the Sanwei flexible clamp system, it can achieve multi-functional production, which greatly reduces the need for site size.

    3) Quickest response to market needs: With the Sanwei flexible welding fixture system, you can quickly respond to market needs, trial production of new products and process improvements without making a large investment.

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