Heating device for hot expansion of steel pipe

Abstract

The utility model discloses a heating device for steel pipe thermal expansion, which comprises a bottom plate, two sides of the top end of the bottom plate are fixedly connected with vertical plates, one side of the top end of the bottom plate is provided with a protective cover, the inside of the protective cover is fixedly connected with a heating coil, and the top end of the bottom plate is provided with a conveying mechanism for conveying steel pipes. According to the heating device for steel pipe thermal expansion, the mounting table is arranged, a steel pipe is placed at the top ends of the supporting rollers before thermal expansion, the supporting rollers at the two ends can support the steel pipe, then the hydraulic cylinder is started to push the mounting table to move towards one side, and the mounting table drives the supporting rollers and the steel pipe on the tops of the supporting rollers to move through the fixing plate; one end of a steel pipe is quickly fed into the protective cover to be heated, the steel pipe can be quickly sent out by starting the hydraulic cylinder after heating is completed, the fixing shaft on one side of the vertical plate can limit the mounting table through the fixing sleeve so as to ensure the stability of the mounting table during movement, and the problem that the steel pipe cannot be automatically conveyed is solved.

Description

A heating device for hot expansion of steel pipes Technical Field

[0001] This utility model relates to the field of steel pipe thermal expansion technology, specifically a heating device for steel pipe thermal expansion. Background Technology

[0002] Hot expansion of steel pipes is a common processing method. One end of the steel pipe is heated to soften it, and then a special support device is used to open and expand the pipe opening to increase the diameter of the steel pipe opening, thereby facilitating the connection of the steel pipes.

[0003] However, the heating devices currently used for hot expansion of steel pipes still have some defects in use. They cannot effectively transport the steel pipes during hot expansion, and it is difficult to remove the steel pipes manually when they are at high temperatures after heating.

[0004] A novel heating device for hot expansion of steel pipes is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a heating device for hot expansion of steel pipes, so as to solve the problem mentioned in the background art of the inability to automatically transport steel pipes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heating device for hot expansion of steel pipes, comprising a base plate, upright plates fixedly connected to both sides of the top of the base plate, a protective cover provided on one side of the top of the base plate, a heating coil fixedly connected inside the protective cover, and a conveying mechanism for conveying steel pipes provided at the top of the base plate.

[0007] The conveying mechanism includes an installation platform. The top of the base plate is movably connected to the installation platform. Two sets of fixing plates are fixedly connected to both sides of the top of the installation platform. A drive shaft is movably connected to both ends of one side of the fixing plate. A support roller is fixedly connected to the outside of the drive shaft. A hydraulic cylinder is fixedly connected to one side of the upright plate. Fixing sleeves are fixedly connected to both ends of one side of the installation platform. A fixing shaft is fixedly connected to both ends of one side of the upright plate.

[0008] As a further technical solution of this utility model, the output end of the hydraulic cylinder is fixedly connected to the mounting platform, and the fixed shaft is slidably connected to the fixed sleeve.

[0009] As a further technical solution of this utility model, the center line of the drive shaft and the center line of the support roller are on the same horizontal plane, and the two sets of drive shafts on one side of the fixed plate are arranged symmetrically.

[0010] As a further technical solution of this utility model, a fixed box is fixedly connected to the top of the mounting platform, and a connecting shaft is movably connected to both ends of the top of the fixed box. A transmission sprocket is fixedly connected to the outside of the connecting shaft, and a transmission chain is movably connected to the outside of the transmission sprocket. Transmission gears are fixedly connected to both sides of the transmission sprocket. A drive motor is fixedly connected to the bottom of the fixed box, and a drive gear is fixedly connected to the output end of the drive motor.

[0011] As a further technical solution of this utility model, the transmission gear is meshed with the drive gear, and the connecting shaft passes through the fixing plate and is fixedly connected to the drive shaft.

[0012] As a further technical solution of this utility model, the center line of the transmission gear and the center line of the transmission sprocket are on the same vertical plane, and the center line of the connecting shaft and the center line of the support roller are on the same horizontal plane.

[0013] As a further technical solution of this utility model, limit grooves are provided at both ends of the top of the upright plate, a cylinder is fixedly connected to one side of the upright plate, connecting plates are fixedly connected to both ends of the bottom of the protective cover, and a limit plate is fixedly connected to one side of the connecting plate.

[0014] As a further technical solution of this utility model, the limiting plate is slidably connected to the limiting groove, and the output end of the cylinder is fixedly connected to the protective cover.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the heating device for hot expansion of steel pipes not only realizes automatic transportation of steel pipes and automatic rotation of steel pipes to improve heating uniformity, but also realizes adjustment of the height of the heating structure according to the diameter of the steel pipe;

[0016] (1) By setting up an installation platform, drive shaft, fixed plate, support roller, fixed shaft, fixed sleeve and hydraulic cylinder, before hot expansion, the steel pipe is placed on the top of the support roller. The support rollers at both ends can support the steel pipe. Then, the hydraulic cylinder is started to push the installation platform to one side. The installation platform then drives the support roller and the steel pipe on the top of the support roller through the fixed plate to move, and one end of the steel pipe is quickly sent into the protective cover for heating. After heating, the hydraulic cylinder is started again to quickly send the steel pipe out. The fixed shaft on one side of the vertical plate can limit the installation platform through the fixed sleeve to ensure its stability during movement, thus realizing automatic transportation of the steel pipe.

[0017] (2) By setting up a drive shaft, a fixed plate, a support roller, a connecting shaft, a fixed box, a drive gear, a drive motor, a transmission gear, a transmission sprocket, and a transmission chain, after the steel pipe is sent into the interior of the protective cover, the drive motor is started to drive the drive gear to rotate. At the same time, the drive gear rotates and drives the connecting shaft to rotate through the transmission gear. The connecting shaft then drives the drive shafts at both ends to rotate synchronously through the transmission sprocket and the transmission chain. Finally, the drive shaft drives the steel pipe at its top to rotate through the support roller. By rotating the steel pipe, the uniformity of heating can be improved, thus realizing the automatic rotation of the steel pipe to improve the uniformity of heating.

[0018] (3) By setting up a vertical plate, a limiting plate, a protective cover, a connecting plate, a cylinder and a limiting groove, before hot expansion processing, the cylinder is started to push the protective cover to rise, and the protective cover is adjusted to a suitable height so that its center is aligned with the center of the steel pipe to be processed, so as to ensure that the distance between the heating coil inside the protective cover and the steel pipe is uniform during processing. The limiting plate at the bottom of the protective cover is attached to the inside of the limiting groove to limit the protective cover, ensuring the stability of the protective cover when it is raised and lowered, and realizing the adjustment of the height of the heating structure according to the diameter of the steel pipe. Attached Figure Description

[0019] Figure 1 is a frontal cross-sectional view of the present invention.

[0020] Figure 2 is a top view sectional view of the fixed box structure of this utility model;

[0021] Figure 3 is a schematic diagram of the mounting platform structure from below according to this utility model;

[0022] Figure 4 is a schematic diagram of the top cross-sectional structure of the vertical plate of this utility model.

[0023] In the diagram: 1. Base plate; 2. Vertical plate; 3. Mounting platform; 4. Drive shaft; 5. Fixing plate; 6. Support roller; 7. Connecting shaft; 8. Fixing box; 9. Limiting plate; 10. Protective cover; 11. Heating coil; 12. Connecting plate; 13. Cylinder; 14. Fixing shaft; 15. Fixing sleeve; 16. Drive gear; 17. Drive motor; 18. Hydraulic cylinder; 19. Transmission gear; 20. Transmission sprocket; 21. Transmission chain; 22. Limiting groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: Please refer to Figures 1-4. A heating device for hot expansion of steel pipe includes a base plate 1, upright plates 2 are fixedly connected to both sides of the top of the base plate 1, a protective cover 10 is provided on one side of the top of the base plate 1, a heating coil 11 is fixedly connected inside the protective cover 10, and a conveying mechanism for conveying steel pipe is provided at the top of the base plate 1.

[0026] The conveying mechanism includes a mounting platform 3. The top of the base plate 1 is movably connected to the mounting platform 3. Two sets of fixed plates 5 are fixedly connected to both sides of the top of the mounting platform 3. The two ends of one side of the fixed plate 5 are movably connected to the drive shaft 4. The outside of the drive shaft 4 is fixedly connected to the support roller 6. The one side of the upright plate 2 is fixedly connected to the hydraulic cylinder 18. The two ends of one side of the mounting platform 3 are fixedly connected to the fixed sleeve 15. The two ends of one side of the upright plate 2 are fixedly connected to the fixed shaft 14.

[0027] The output end of the hydraulic cylinder 18 is fixedly connected to the mounting platform 3, and the fixed shaft 14 is slidably connected to the fixed sleeve 15.

[0028] The centerline of the drive shaft 4 and the centerline of the support roller 6 are on the same horizontal plane, and the two sets of drive shafts 4 on one side of the fixed plate 5 are arranged symmetrically.

[0029] Specifically, as shown in Figures 1, 2, and 3, before thermal expansion, the steel pipe is placed on the top of the support roller 6. The support rollers 6 at both ends can support the steel pipe. Then, the hydraulic cylinder 18 is activated to push the mounting platform 3 to one side. The mounting platform 3 then drives the support roller 6 and the steel pipe on top of the support roller 6 to move through the fixing plate 5, quickly sending one end of the steel pipe into the protective cover 10 for heating. After heating is completed, the hydraulic cylinder 18 is activated again to quickly send the steel pipe out. The fixing shaft 14 on one side of the vertical plate 2 can limit the mounting platform 3 through the fixing sleeve 15 to ensure its stability during movement, thus realizing automatic transportation of the steel pipe.

[0030] The top of the mounting platform 3 is fixedly connected to a fixed box 8. The two ends of the top inside the fixed box 8 are movably connected to a connecting shaft 7. The outside of the connecting shaft 7 is fixedly connected to a transmission sprocket 20. The outside of the transmission sprocket 20 is movably connected to a transmission chain 21. The two sides of the transmission sprocket 20 are fixedly connected to transmission gears 19. The bottom inside the fixed box 8 is fixedly connected to a drive motor 17. The output end of the drive motor 17 is fixedly connected to a drive gear 16.

[0031] The transmission gear 19 meshes with the drive gear 16, and the connecting shaft 7 passes through the fixed plate 5 and is fixedly connected to the drive shaft 4.

[0032] The centerline of the transmission gear 19 and the centerline of the transmission sprocket 20 are on the same vertical plane, and the centerline of the connecting shaft 7 and the centerline of the support roller 6 are on the same horizontal plane.

[0033] Specifically, as shown in Figures 1 and 2, after the steel pipe is sent into the interior of the protective cover 10, the drive motor 17 is started to drive the drive gear 16 to rotate. At the same time, the drive gear 16 rotates and drives the connecting shaft 7 to rotate through the transmission gear 19. The connecting shaft 7 then drives the drive shafts 4 at both ends to rotate synchronously through the transmission sprocket 20 and the transmission chain 21. Finally, the drive shaft 4 drives the steel pipe at its top to rotate through the support roller 6. By rotating the steel pipe, the heating uniformity can be improved, thus realizing the automatic rotation of the steel pipe to improve the heating uniformity.

[0034] Limiting grooves 22 are provided at both ends of the top of the upright plate 2. A cylinder 13 is fixedly connected to one side of the upright plate 2. A connecting plate 12 is fixedly connected to both ends of the bottom of the protective cover 10. A limiting plate 9 is fixedly connected to one side of the connecting plate 12.

[0035] The limiting plate 9 is slidably connected to the limiting groove 22, and the output end of the cylinder 13 is fixedly connected to the protective cover 10.

[0036] Specifically, as shown in Figures 1 and 4, before the hot expansion process, the cylinder 13 is activated to push the protective cover 10 up, and the protective cover 10 is adjusted to a suitable height so that its center is aligned with the center of the steel pipe to be processed. This ensures that the distance between the heating coil 11 inside the protective cover 10 and the steel pipe is uniform during processing. In addition, the limiting plate 9 at the bottom of the protective cover 10 fits into the inside of the limiting groove 22 to limit the protective cover 10 and ensure the stability of the protective cover 10 when it is raised and lowered. This allows the height of the heating structure to be adjusted according to the diameter of the steel pipe.

[0037] Working Principle: Before hot expansion processing, the cylinder 13 is activated to lift the protective cover 10, adjusting it to a suitable height so that its center aligns with the center of the steel pipe to be processed. This ensures uniform spacing between the heating coil 11 inside the protective cover 10 and the steel pipe during processing. The limiting plate 9 at the bottom of the protective cover 10 fits into the limiting groove 22, limiting the protective cover 10 and ensuring its stability during lifting. The steel pipe is then placed on the top of the support rollers 6, which support the pipe. The hydraulic cylinder 18 is then activated to move the mounting platform 3 to one side. The mounting platform 3, through the fixing plate 5, then drives the support rollers 6 and 6... The top steel pipe moves, quickly sending one end of the steel pipe into the protective cover 10 for heating. After heating, the hydraulic cylinder 18 is activated to quickly send the steel pipe out. The fixed shaft 14 on one side of the upright plate 2 can limit the mounting platform 3 through the fixed sleeve 15 to ensure its stability during movement. After the steel pipe is sent into the protective cover 10, the drive motor 17 is activated to drive the drive gear 16 to rotate. At the same time, the drive gear 16 rotates and drives the connecting shaft 7 to rotate through the transmission gear 19. The connecting shaft 7 then drives the drive shafts 4 at both ends to rotate synchronously through the transmission sprocket 20 and the transmission chain 21. Finally, the drive shaft 4 drives the top steel pipe to rotate through the support roller 6. Rotating the steel pipe can improve the uniformity of heating.

Claims

1. A heating device for hot expansion of steel pipes, comprising a base plate (1), characterized in that: The top of the base plate (1) is fixedly connected to two upright plates (2) on both sides. A protective cover (10) is provided on one side of the top of the base plate (1). A heating coil (11) is fixedly connected inside the protective cover (10). A conveying mechanism for conveying steel pipes is provided at the top of the base plate (1). The conveying mechanism includes an installation platform (3). The top of the base plate (1) is movably connected to the installation platform (3). Two sets of fixing plates (5) are fixedly connected to the top of the installation platform (3) on both sides respectively. A drive shaft (4) is movably connected to both ends of one side of the fixing plate (5). A support roller (6) is fixedly connected to the outside of the drive shaft (4). A hydraulic cylinder (18) is fixedly connected to one side of the upright plate (2). A fixing sleeve (15) is fixedly connected to both ends of one side of the installation platform (3). A fixing shaft (14) is fixedly connected to both ends of one side of the upright plate (2).

2. The heating device for hot expansion of steel pipes according to claim 1, characterized in that: The output end of the hydraulic cylinder (18) is fixedly connected to the mounting platform (3), and the fixed shaft (14) is slidably connected to the fixed sleeve (15).

3. The heating device for hot expansion of steel pipes according to claim 1, characterized in that: The centerline of the drive shaft (4) and the centerline of the support roller (6) are on the same horizontal plane, and the two sets of drive shafts (4) on one side of the fixed plate (5) are arranged symmetrically.

4. The heating device for hot expansion of steel pipes according to claim 1, characterized in that: The top of the mounting platform (3) is fixedly connected to a fixed box (8). The two ends of the top of the fixed box (8) are movably connected to a connecting shaft (7). The outside of the connecting shaft (7) is fixedly connected to a transmission sprocket (20). The outside of the transmission sprocket (20) is movably connected to a transmission chain (21). The two sides of the transmission sprocket (20) are fixedly connected to transmission gears (19). The bottom of the fixed box (8) is fixedly connected to a drive motor (17). The output end of the drive motor (17) is fixedly connected to a drive gear (16).

5. The heating device for hot expansion of steel pipes according to claim 4, characterized in that: The transmission gear (19) meshes with the drive gear (16), and the connecting shaft (7) passes through the fixing plate (5) and is fixedly connected to the drive shaft (4).

6. The heating device for hot expansion of steel pipes according to claim 4, characterized in that: The centerline of the transmission gear (19) and the centerline of the transmission sprocket (20) are on the same vertical plane, and the centerline of the connecting shaft (7) and the centerline of the support roller (6) are on the same horizontal plane.

7. The heating device for hot expansion of steel pipes according to claim 1, characterized in that: Limiting grooves (22) are provided at both ends of the top of the upright plate (2), a cylinder (13) is fixedly connected to one side of the upright plate (2), a connecting plate (12) is fixedly connected to both ends of the bottom of the protective cover (10), and a limiting plate (9) is fixedly connected to one side of the connecting plate (12).

8. A heating device for hot expansion of steel pipes according to claim 7, characterized in that: The limiting plate (9) is slidably connected to the limiting groove (22), and the output end of the cylinder (13) is fixedly connected to the protective cover (10).

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