Positioning tool for welding pressure vessel

Abstract

The utility model relates to a positioning tool for welding a pressure vessel, which comprises a fixed support, a movable support and a centering unit, and has the technical key points that the upper surface of the fixed support is provided with a front group of fixed riding wheels and a rear group of fixed riding wheels, the movable support is a cross numerical control sliding table, the upper surface of the movable support is provided with a front group of longitudinal guide plates and a rear group of longitudinal guide plates, and the upper parts of the longitudinal guide plates are sleeved with longitudinal sliding sleeves; the longitudinal sliding sleeves on the two longitudinal guide plates in the same group are fixed into a whole through a linkage plate, a lifting cylinder group is fixed between the linkage plate and the cross numerical control sliding table, and a front group of movable riding wheels and a rear group of movable riding wheels are arranged between the two groups of longitudinal sliding sleeves; the centering unit comprises a front centering assembly and a rear centering assembly, the front centering assembly and the rear centering assembly respectively comprise a positioning disc, a radial groove, a stepped radial rod and an arc-shaped supporting plate, the center of the positioning disc of the front centering assembly is provided with an infrared sensor transmitting end, and the center of the positioning disc of the rear centering assembly is provided with an infrared sensor receiving end. Compared with the prior art, the positioning effect is good, meanwhile, the welding device is suitable for welding operation of large-size cylindrical container pieces, and safety is good.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure vessel production equipment, specifically to a positioning fixture for pressure vessel welding. Background Technology

[0002] Due to the stringent requirements of the working environment, pressure vessels require seamless welding to achieve a stable and secure connection between adjacent cylindrical components during manufacturing. This places extremely high demands on the welding positioning fixtures to prevent welding defects caused by inaccurate positioning.

[0003] Based on this, CN 216326208 U discloses a positioning fixture for welding pressure vessels. Its column has a hollow cavity, and the lower end of a support rod slides into the hollow cavity of the column and is connected to a push plate. The outer wall of the push plate fits against the inner wall of the hollow cavity, and the lower end of the push plate is elastically connected to the bottom wall of the hollow cavity via a return spring. The upper end of the support rod has a placement seat, which is rotatably connected to two meshing gears. Each gear is fixedly connected to one end of a corresponding clamping claw. Both clamping claws are connected to a bracket, and their other ends are tightly fitted together. The bracket is fixed to the column, and the lower ends of the two columns are connected to a moving mechanism. This positioning fixture's clamping unit enables automatic clamping of cylindrical container parts and can adapt to the needs of cylindrical container parts of different diameters, reducing production costs. By setting a center alignment mechanism, it achieves coaxial and rapid positioning of the cylindrical container parts, aiming to ensure welding quality and efficiency. However, the following problems still exist when using it: 1. The cylindrical container part of the pressure vessel is pre-fixed by two clamping claws, and the fulcrum position is singular, which is not suitable for fixing large cylindrical container parts; 2. After clamping and positioning, it cannot drive the cylindrical container part to rotate, only the welding device can rotate, which is not conducive to welding operation and has poor safety. Summary of the Invention

[0004] The purpose of this invention is to provide a positioning fixture for welding pressure vessels that has a reasonable structure and reliable use, which solves the above-mentioned problems. Compared with the prior art, it not only has a better positioning effect, but is also suitable for welding large cylindrical containers and has good safety.

[0005] The technical solution of this utility model is:

[0006] A positioning fixture for welding pressure vessels includes a fixed support, a movable support, and a centering unit. Its key technical features are: the fixed support has two sets of fixed support rollers (front and rear) on its upper surface; the movable support is a cross-shaped CNC slide table; the upper surface of the cross-shaped CNC slide table has two sets of longitudinal guide plates (front and rear); longitudinal sleeves are fitted onto the upper part of the longitudinal guide plates; the longitudinal sleeves on the two longitudinal guide plates of the same set are fixed together by a linkage plate; a lifting cylinder assembly is fixed between the linkage plate and the cross-shaped CNC slide table; and a centering unit is provided between the two sets of longitudinal sleeves. It has two sets of moving support rollers, front and rear; the centering unit includes a front centering assembly and a rear centering assembly, the front centering assembly and the rear centering assembly respectively include a positioning disk, a plurality of radial grooves evenly arranged in the positioning disk, a stepped radial rod with one end located in the radial groove and the other end located outside the positioning disk, and an arc-shaped support plate located at the outer end of the stepped radial rod. The positioning disk of the front centering assembly is provided with an infrared sensor emitting end at its center, and the positioning disk of the rear centering assembly is provided with an infrared sensor receiving end facing the infrared sensor emitting end at its center.

[0007] The aforementioned positioning fixture for welding pressure vessels comprises a positioning disc consisting of a front housing, a rear housing, and a screw assembly that are fastened together.

[0008] In the aforementioned positioning fixture for welding pressure vessels, the wide diameter section of the stepped radial rod matches the size of the radial groove, the narrow diameter section of the stepped radial rod is located outside the positioning plate, and the outer surface of the narrow diameter section is marked with scale lines.

[0009] The aforementioned positioning fixture for welding pressure vessels has synchronous transmission wheels on the axles of the fixed support roller and the movable support roller, respectively.

[0010] The aforementioned positioning fixture for welding pressure vessels has a damping layer between the contact surfaces of the stepped radial rod and the radial groove.

[0011] The aforementioned positioning fixture for welding pressure vessels has a flexible pad layer on the outer surface of the arc-shaped support plate.

[0012] The beneficial effects of this utility model are:

[0013] In operation, one section of the cylindrical container to be welded is first hoisted above the fixed support roller assembly, and the other section is hoisted above the movable support roller assembly. The outer diameters of the front and rear centering assemblies are adjusted according to the inner diameter of the cylindrical container. The front centering assembly is supported within the cylindrical container above the fixed support roller assembly, and the rear centering assembly is supported within the cylindrical container above the movable support roller assembly. The horizontal and vertical positions of the cylindrical container above the movable support rollers are adjusted using a cross-shaped CNC slide and a lifting cylinder assembly. Once the infrared sensor receiver on the positioning plate of the rear centering assembly receives a signal from the infrared sensor transmitter, the position adjustment stops. The cross-shaped CNC slide then moves the cylindrical container on it towards the other cylindrical container until the ends of the two cylindrical container sections are aligned. This achieves the pre-welding positioning of the two cylindrical container sections. Compared with existing technologies, this method not only provides better positioning but is also suitable for welding large cylindrical container sections and offers better safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 The right view;

[0016] Figure 3 yes Figure 1 Enlarged view of section A.

[0017] In the diagram: 1. Cylindrical container component, 2. Cylindrical container component, 3. Fixed support, 4. Fixed support roller, 5. Linkage plate, 6. Cross-shaped CNC slide table, 7. Lifting cylinder assembly, 8. Moving support roller, 9. Longitudinal sliding sleeve, 10. Longitudinal guide plate, 11. Arc-shaped support plate, 12. Positioning plate, 13. Screw assembly, 14. Scale mark, 15. Stepped radial rod, 16. Infrared sensor receiver, 17. Infrared sensor transmitter. Detailed Implementation

[0018] The present invention will be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-3 As shown, the positioning fixture for welding the pressure vessel includes a fixed support 3, a movable support, and a centering unit.

[0020] The fixed support 3 has two sets of fixed support rollers 4, one in front and one in back, on its upper surface.

[0021] The movable support is a cross-shaped CNC slide table 6 (simplified illustration in the figure). The upper surface of the cross-shaped CNC slide table 6 is provided with two sets of longitudinal guide plates 10, one in front and one in back. The upper part of the longitudinal guide plate 10 is fitted with a longitudinal sliding sleeve 9, and the longitudinal sliding sleeves 9 on the two longitudinal guide plates 10 in the same set are fixed together by a linkage plate 5. A lifting cylinder group 7 is fixed between the linkage plate 5 and the cross-shaped CNC slide table 6. Two sets of movable support rollers 8 are provided between the two sets of longitudinal sliding sleeves 9.

[0022] The centering unit includes a front centering assembly and a rear centering assembly. The front and rear centering assemblies each include a positioning disk 12, multiple radial grooves evenly distributed within the positioning disk 12, a stepped radial rod 15 with one end located in the radial groove and the other end located outside the positioning disk, and an arc-shaped support plate 11 located at the outer end of the stepped radial rod 15. The positioning disk 12 of the front centering assembly has an infrared sensor emitting end 17 at its center, and the positioning disk 12 of the rear centering assembly has an infrared sensor receiving end 16 facing the infrared sensor emitting end 17 at its center. In this embodiment, the positioning disk 12 consists of a front housing, a rear housing, and a screw assembly 13 connected together. The wide diameter section of the stepped radial rod 15 matches the size of the radial groove, and the narrow diameter section of the stepped radial rod 15 is located outside the positioning disk 12, with scale markings 14 on its outer surface. A damping layer is provided between the contact surfaces of the stepped radial rod 15 and the radial groove. A flexible pad is provided on the outer surface of the arc-shaped support plate 11.

[0023] The fixed support roller 4 and the movable support roller 8 are respectively equipped with synchronous transmission wheels (omitted in the figure).

[0024] Working principle:

[0025] In use, first hoist the section of cylindrical container 1 to be welded above the front and rear sets of fixed support rollers 4, and then hoist the other section of cylindrical container 2 to be welded above the front and rear sets of movable support rollers 8.

[0026] Adjust the outer diameter of the front centering assembly and the rear centering assembly according to the inner diameter of the cylindrical container parts 1 and 2, that is, adjust the distance from the outer surface of the arc support plate 11 to the center of the positioning plate 12. This can be adjusted by the scale mark 14, thereby ensuring the outward extension of each stepped radial rod 15. Finally, use the screw assembly 13 to lock the front and rear housings of the positioning plate 12 to prevent the stepped radial rods 15 from shifting.

[0027] The front centering assembly is supported in the cylindrical container 1 above the fixed support roller 4, and the rear centering assembly is supported in the cylindrical container 2 above the moving support roller 8.

[0028] The cylindrical container 2 above the moving support roller 8 is adjusted in horizontal and vertical directions by the cross-shaped CNC slide table 6 and the lifting cylinder group 7. When the infrared sensor receiver 16 on the positioning plate 12 of the rear centering assembly receives the signal from the infrared sensor transmitter 17, the position adjustment stops. Then, the cross-shaped CNC slide table 6 is used to move the cylindrical container 2 on it to another cylindrical container 1 until the ends of the two cylindrical containers are connected.

[0029] The synchronous transmission wheels on the axles of the fixed support roller 4 and the movable support roller 8 are connected to the drive source through a transmission mechanism to achieve synchronous drive, thereby driving the fixed support roller 4 and the movable support roller 8 to rotate, and then driving the two cylindrical container parts to rotate synchronously. At this time, welding can be carried out using a welding device.

[0030] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.

Claims

1. A positioning tool for welding a pressure vessel, comprising a fixed support, a movable support and a centering unit, characterized in that: The upper surface of the fixed support is provided with two groups of front and rear fixed supporting wheels, the movable support is a cross numerical control sliding table, the upper surface of the cross numerical control sliding table is provided with two groups of front and rear longitudinal guide plates, longitudinal sliding sleeves are sleeved on the upper portions of the longitudinal guide plates, the longitudinal sliding sleeves on the two longitudinal guide plates of the same group are fixed as a whole by means of a linkage plate, a lifting cylinder group is fixed between the linkage plate and the cross numerical control sliding table, and two groups of front and rear movable supporting wheels are arranged between the two groups of longitudinal sliding sleeves.

2. The positioning tool for welding a pressure vessel according to claim 1, characterized by: The positioning disc is composed of a front shell, a rear shell and a screw assembly connected together.

3. The positioning tool for welding a pressure vessel according to claim 1, wherein: The wide diameter section of the stepped radial rod is matched with the size of the radial slot, the narrow diameter section of the stepped radial rod is located outside the positioning disc, and the outer surface of the narrow diameter section is provided with scale line marks.

4. The positioning tool for welding a pressure vessel according to claim 1, wherein: Synchronous transmission wheels are respectively arranged on the wheel shafts of the fixed supporting wheels and the movable supporting wheels.

5. The positioning tool for welding a pressure vessel according to claim 1, wherein: A damping layer is arranged between the contact surfaces of the stepped radial rod and the radial slot.

6. The positioning tool for welding a pressure vessel according to claim 1, wherein: The outer surface of the arc-shaped supporting plate is provided with a flexible cushion layer.

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