Pneumatic car for welding lorry-mounted crane jib

Abstract

The invention discloses a pneumatic car for welding a lorry-mounted crane jib, belongs to the field of jib welding, and aims to provide a pneumatic car which is simple in structure, convenient to useand capable of meeting production demands and prevents welding deformation. According to the technical scheme adopted for solving the technical problem, the pneumatic car for welding the lorry-mountedcrane jib comprises a frame, wheels and a top plate, wherein the frame is rectangular, the wheels are arranged on the two sides of the frame, the top plate is arranged on the frame, air cylinders arearranged between the top plate and the frame, a cylinder barrel of each air cylinder is connected with the frame, and the top of a piston rod of each air cylinder is connected with the bottom of thetop plate. The pneumatic car can be widely applied to the field of jib welding.

Description

technical field [0001] The invention relates to a pneumatic trolley used for boom welding of a lorry-mounted crane, belonging to the technical field of boom welding. Background technique [0002] The boom of the truck-mounted crane is an important stress-bearing part of the crane. It must have sufficient strength and rigidity as well as sufficient light weight. Therefore, most of the boom parts are bent and formed by high-strength steel plates with a thickness of 4-6mm. Then it is welded to form a closed cavity. The arm body is generally divided into single-pass weld and double-pass weld. figure 1 , figure 2 As shown, because high-strength plates generally do not undergo thermal correction to prevent annealing of steel during thermal correction, thereby reducing the strength of the material. During welding, the heat input of the double-pass weld is greater than that of the single weld, but due to Due to the structural characteristics of double welds, the deformation produ...

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Problems solved by technology

[0002] The boom of the truck-mounted crane is an important stress-bearing part of the crane. It must have sufficient strength and rigidity as well as sufficient light weight. Therefore, most of the boom parts are bent and formed by high-strength steel plates with a thickness of 4-6mm. Then it is welded to form a closed cavity. The arm body is generally divided into single-pass weld and double-pass weld. figure 1 , figure 2 As shown, because high-strength plates generally do not undergo thermal correction to prevent annealing of steel during thermal correction, thereby reducing the strength of the material. During welding, the heat input of the double-pass weld is greater than that of the single weld, but due to Due to the structural characteristics of double welds, the deformation produced by them will offset part of the deformation. Therefore, compared with double welds, the deformation of single welds is more difficult to control. Although the deformation of single welds is large, the structure of single welds is simpler. Economical, so now the structure of single weld seam is mostly used for welding, but this brings technical problems: 1. It is necessary to improve the bending accuracy of the arm body; 2. Multiple arm bodies are mounted together, and the deformation will be eliminated directly with each other 3. Intermittent welding in sections to reduce heat input; 4. Install process support plates inside the arm body

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