A cylindrical longitudinal seam welding device

Abstract

Disclosed is a cylinder longitudinal seam welding device. The cylinder longitudinal seam welding device comprises a support, a cylinder body propulsion mechanism, a welding seam positioning mechanism and a welding mechanism, wherein the cylinder body propulsion mechanism, the welding seam positioning mechanism and the welding mechanism are placed on the support. The support is composed of a front support body and a rear support body which are fixed on a floor. The rear support body is sequentially provided with the welding seam positioning mechanism and the cylinder body propulsion mechanism from top to bottom, the welding seam positioning mechanism and the cylinder body propulsion mechanism are located on the side, close to the front support body, of the rear support body, and the welding mechanism corresponds to the cylinder body propulsion mechanism and is placed on the front support body. The cylinder body propulsion mechanism is composed of a servo motor, a supporting arm, a guide rod, a lead screw, a propulsion sliding block and a guide rod supporting plate. A feeding bracket is arranged on the floor and located under the cylinder body propulsion mechanism. According to the cylinder longitudinal seam welding device, the cylinder body propulsion mechanism can push cylinder bodies with large dimension errors to move forwards steadily on the feeding bracket, and the welding defects caused by poor feeding smoothness can be overcome. The cylinder longitudinal seam welding device is simple in structure, low in manufacture and maintenance cost, good in fault-tolerant ability to the cylinder body plate length, high in adaptability, stable in welding quality and high in percent of pass.

Description

technical field [0001] The invention relates to a longitudinal seam welding device of a cylinder body, in particular to an automatic welding device for the longitudinal seam of an air storage cylinder of a truck. [0002] technical background [0003] At present, the welding production of the longitudinal seam of the cylinder is generally carried out by a cantilever structural welder. This welding machine is mainly composed of a machine base, a cantilever beam, a supporting shaft, a keyboard board, a centering mechanism, a padlock, a welding gun traveling mechanism, a welding gun clamping and welding gun adjusting mechanism, and an electrical control part. The working process is mainly divided into four steps: firstly, spot welding the cylinder, and preliminarily weld the rounded cylinder on the positioning fixture; On the cantilever beam of the welding machine, and use the keyboard to clamp the cylinder body. In order to ensure that the longitudinal welding seam is parallel...

AI Technical Summary

Problems solved by technology

[0005] First, welds are prone to welding defects

On the one hand, although the centering mechanism is used to limit the position of the weld seam when the cylinder is installed, it is difficult to ensure that the welding torch is always in the center of the weld seam due to the gap between the centering mechanism and the welding torch traveling mechanism, resulting in the deviation of the weld bead and welding defects , especially when plasma or laser TAG welding is used; on the other hand, the welding heat and deformation on both sides of the butt weld cannot be completely consistent, and the clamping force of the piano key clamping mechanism is limited. The force is not enough to overcome the deformation of the workpiece due to welding heat, resulting in a height deviation on both sides of the butt weld, which can easily cause welding defects, especially when the cylinder is made of materials with a large linear expansion coefficient such as stainless steel, welding defects from time to time

[0006] Second, the deformation of the cylinder after welding is large, and the welding machine does not correct the mechanism for welding deformation caused by welding heat. After welding, the cross-section of the cylinder deforms greatly, which affects the subsequent assembly and welding of end caps, and the appearance of the product is not high.

[0007] The third is that the production efficiency is low. Before the welding of the cylinder, it is necessary to perform spot welding on the positioning fixture. The assembly of the cylinder before welding and the removal of the cylinder from the cantilever after welding are time-consuming, and material handling is time-consuming and labor-intensive.

Although this welding device solves the problem of low production efficiency of the above-mentioned cantilever welding machine, the feeding method of this welding device is prone to poor feeding, uneven feeding speed or large weld seams during actual use. The problem is that the longitudinal seam of the cylinder welded by this device has the problems of unstable weld quality and low pass rate (the main reasons are in the following two aspects: 1. The length of the sheet material rolled into the cylinder is actually impossible to be completely consistent. Yes, there is bound to be an error, that is, there is an error in the diameter of the cylinder to be welded. When the diameter is large, the resistance of the cylinder when it passes through the welding mechanism will be large, and it is easy to cause poor feeding, but when the diameter is small, it is easy to There is a problem of large gap between the weld seams to be welded, which makes it difficult to guarantee the welding quality; 2. The workpiece is heated unevenly during the welding process, which will inevitably cause welding deformation, especially when welding materials with a large linear expansion coefficient such as stainless steel, the welding deformation is more severe. To be obvious, at this time, the resistance of the cylinder passing through the welding mechanism will change unpredictably, which will also induce poor feeding)

The welding device with this structure has poor tolerance to the length of the cylinder plate, poor adaptability to the change of feed resistance caused by welding deformation, and is still prone to welding defects. At the same time, the structure of the device is relatively complicated, and the cost of manufacturing and maintenance higher

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