Thin-wall cylinder welding positioning device

Abstract

The invention discloses a thin-walled cylinder welding positioning device, and belongs to the technical field of welding devices. The device comprises a mandrel, a cone is fixedly arranged on the mandrel, an annular expansion block is arranged on the cone, a red copper plate is arranged on the outer side of the expansion block, the side face of the expansion block makes contact with a gland, and the gland makes contact with a gland nut. And a pressing plate is arranged on the other side of the gland nut and is fixed by a pressing plate nut. The end face of the gland is pressed by the gland nut to uniformly apply pressure, so that the expansion block is expanded into the long cylinder in a three-section manner, the position of a red copper plate fusion welding groove fixed by a screw on the outer surface of the expansion block is determined to be correct with the position of a welding line between a seal head and the inner wall of the cylinder, and the phenomenon that the position of the fusion welding groove deviates to cause incomplete welding is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of welding devices, and in particular relates to a thin-walled cylinder welding positioning device. Background Art

[0002] When welding thin-walled cylinders, welding deformation and product precision failure or even scrapping due to welding misalignment are prone to occur. The more common expansion and centering fixtures are not suitable for cylinders with a length-to-diameter ratio of 1:16. When welding products with a large length-to-diameter ratio, it is easy to cause parts to weld misaligned. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a thin-walled cylinder welding positioning device with a simple structure.

[0004] The technical solution of the present invention to solve the above technical problems is: a thin-walled cylinder welding positioning device, including a mandrel, a cone is fixedly provided on the mandrel, an annular expansion block is provided on the cone, a copper plate is provided on the outer side of the expansion block, the side of the expansion block contacts the gland, and the gland contacts the gland nut; a pressure plate is provided on the other side of the gland nut, and the pressure plate is fixed by the pressure plate nut;

[0005] Furthermore, a radial annular groove is designed on the outer circumference of the copper plate.

[0006] Furthermore, the expansion block is annular and is equally divided into 4-6 blocks.

[0007] The technical effect of the present invention is that: the present invention uses the pressure cover nut to press the end face of the pressure cover evenly to expand the expansion block into a three-petal shape to the inside of the long cylinder, and then puts the second pressure plate into the stop position of the cylinder body through the second core shaft, and tightens the second nut to determine that the position of the copper plate molten welding groove fixed by screws on the outer surface of the expansion block is correct with the weld position between the head and the inner wall of the cylinder body, ensuring that the molten welding groove position will not be offset and the welding will not fail to penetrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the cone assembly in the present invention.

[0009] Figure 2 It is a structural schematic diagram of the present invention.

[0010] Figure 3 It is a schematic diagram of the cylinder circumferential seam welding of the present invention.

[0011] Figure 4 It is a structural schematic diagram of the copper plate in the present invention. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] See also Figure 1-4 The present invention comprises a first mandrel 1, a shoulder nut 2, a first pressure plate 3, a gland nut 4, a gland 5, a swelling block 6, a copper plate 7, a cone 8, a second mandrel 9, a second pressure plate 10, a second nut 11, a pin 12, a cotter pin 13, and a screw 14; the present invention utilizes the gland 5 to transmit the axial pressure of the gland nut 4, so that the swelling block 6 matched with the cone is spread in a three-petal type, the swelling circle clamps and centers the inner hole of the workpiece to be welded, the taper of the inner wall of the swelling block 6 is the same as the taper of the outer surface of the cone, and a radial annular groove is designed at the outer circle of the copper plate 7, such as Figure 4 As shown. It can effectively solve the problem of difficult penetration during welding. The fixture solves the deformation and eccentricity problems of conventional welding as a whole.

[0014] The cone assembly device is composed of a second mandrel 1, a cone 8, and a second mandrel 9. The cone 8 is formed by welding a hollow mandrel and a cone. The mandrel of the cone 8 and the second mandrel 9 are matched and connected through a pin 12. The assembled state is shown in FIG. Figure 1 shown.

[0015] The inner conical surface of the expansion block 6 is matched with the outer conical surface of the cone 8, and then the pressure cover 5 is inserted into the first core shaft 1. The end surface of the pressure cover 5 is pressed evenly by the pressure cover nut 4 to make the expansion block 6 open to the inside of the long cylinder in a three-petal shape. The expansion block is annular and is divided into 4-6 pieces. Then the second pressure plate 10 is put into the position of the stop of the cylinder body through the second core shaft 9, and the second nut 11 is tightened to make sure that the position of the molten welding groove of the copper plate 7 fixed by the screw 14 on the outer surface of the expansion block 6 is correct with the position of the weld between the head and the inner wall of the cylinder body to ensure that the position of the molten welding groove will not be offset and the welding will not be fully penetrated.

[0016] Put the head in and tighten the gland nut 4 to apply pressure to the expansion block 6, which is stretched open by the cone 8, so that the head and the barrel are concentric and tightened. Finally, the first pressure plate 3 is assembled at the stop of the head, and the shoulder nut 2 is screwed into the front end of the first pressure plate 3 to fix the head and generate a relative force on the second nut 11 to ensure that the head and the barrel are tightly matched and clamped axially. The barrel and the clamp device are assembled as a whole and placed on the argon arc welding center frame for calibration to ensure the correct welding position and prevent misalignment. Figure 3 The present invention utilizes the principle of internal support during welding, so that it can be welded not only when the end of the head is in an open state but also when the end of the head is in a closed state, effectively avoiding welding defects such as misalignment and deformation, and the assembly is stable and reliable.

Claims

1. A thin-walled cylinder welding positioning device, Features: It includes a core shaft, a cone is fixed on the core shaft, an annular expansion block is arranged on the cone, a copper plate is arranged on the outer side of the expansion block, the side of the expansion block contacts the pressure cover, and the pressure cover contacts the pressure cover nut; a pressure plate is arranged on the other side of the pressure cover nut, and the pressure plate is fixed by the pressure plate nut.

2. The thin-walled cylinder welding positioning device according to claim 1: Features: A radial annular groove is designed on the outer circumference of the copper plate.

3. The thin-walled cylinder welding positioning device according to claim 1: Features: The expansion block is annular and is equally divided into 4-6 blocks.

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