A bearing steel pipe hot working piercing rolling device

Abstract

This utility model relates to the field of hot working technology for bearing steel pipes, and specifically discloses a piercing and rolling device for hot working of bearing steel pipes. During the piercing and rolling process of the steel pipe, a hydraulic push rod can be activated. The output shaft of the hydraulic push rod extends or retracts, thereby driving a limit stop to slide. The limit stop is connected to a triangular protrusion ring via a connecting rod. When one limit stop moves, it pushes the triangular protrusion ring to rotate via the connecting rod. As the triangular protrusion ring rotates, it synchronously pulls three limit stops to slide, thereby adjusting their distance from the steel pipe. During the piercing and rolling process, the three limit stops can be driven to slide close to the circumference of the steel pipe without clamping it. This prevents the rear end of the steel pipe from wobbling when the front end is being processed, ensuring stable piercing and rolling operations and improving the final product quality.

Description

Technical Field

[0001] This utility model relates to the field of hot working technology of bearing steel pipes, and in particular to a hot working piercing and rolling device for bearing steel pipes. Background Technology

[0002] The hot-working piercing rolling mill for bearing steel tubes plays a crucial role in producing high-quality bearing steel tubes. During the manufacturing process, this mill is used to roll and pierce heated steel tubes, transforming solid steel tubes into hollow bearing steel tubes that meet specific requirements. Its applications span various bearing steel tube manufacturing enterprises. Through hot working of the steel tubes, it meets the needs of different industrial sectors for bearing steel tubes, ensuring that the produced bearing steel tubes possess excellent quality and performance. Currently, the practical application of this mill typically requires the following technologies:

[0003] 1. High-temperature resistant roll material to adapt to the high-temperature environment during hot working of steel pipes, ensuring the wear resistance and stability of the rolls;

[0004] 2. A precise power transmission system ensures that the two rolls can rotate precisely in opposite directions, providing stable extrusion pressure for steel pipe rolling;

[0005] 3. A reliable displacement pushing mechanism can accurately push the steel pipe and the piercing top rod, so as to achieve the smooth progress of the piercing rolling process;

[0006] 4. A robust support structure ensures the stability of the entire device during processing.

[0007] Currently, various manufacturers employ different equipment and methods to achieve the hot-working piercing rolling function for bearing steel tubes. Some manufacturers use a combination of relatively traditional rolling and piercing equipment, achieving extrusion and piercing of the steel tubes through simple mechanical structures. Other manufacturers have introduced highly automated production lines, utilizing advanced sensors and control systems to improve processing efficiency and precision. Still others focus on optimizing the design and manufacturing of the rolls, improving rolling quality by modifying the roll shape and material.

[0008] However, the above method has a prominent problem: when processing the front end of the steel pipe, existing devices generally lack a rear-end centering and limiting mechanism. When the steel pipe just comes into contact with the piercing rod, due to the lack of an effective rear-end centering and limiting mechanism, the piercing rod will apply a concentrated pushing force to the front end of the steel pipe at the moment of contact. At this time, if there is no centering and limiting mechanism at the rear end of the steel pipe, the force cannot be evenly transmitted to the entire steel pipe after the front end is subjected to force, resulting in uneven force on various parts of the steel pipe. The steel pipe is prone to shaking. This shaking will slightly affect the accuracy of piercing and rolling, leading to quality problems such as steel pipe diameter deviation and non-compliance with roundness standards. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this utility model provides a hot-working piercing and rolling device for bearing steel pipes. It solves the problem that existing devices generally lack a rear-end centering and limiting mechanism when processing the front end of the steel pipe. When the steel pipe just contacts the piercing rod, due to the lack of an effective rear-end centering and limiting mechanism, the piercing rod applies a concentrated pushing force to the front end of the steel pipe at the instant of contact. If there is no centering and limiting mechanism at the rear end, the force cannot be evenly transmitted to the entire steel pipe after the front end is subjected to force, resulting in uneven stress on different parts of the steel pipe. This causes the steel pipe to easily wobble, which slightly affects the accuracy of piercing and rolling, leading to quality problems such as steel pipe diameter deviation and substandard roundness.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A hot-working piercing and rolling device for bearing steel pipes includes a limiting support base. A triangular protrusion ring is rotatably connected inside the limiting support base. Three connecting rods are rotatably connected inside the triangular protrusion ring. Three limiting stops are slidably connected to the outer surface of the limiting support base. The three connecting rods are rotatably connected inside the three limiting stops. A hydraulic push rod is fixedly connected to the outer surface of the limiting support base. The output shaft of the hydraulic push rod is fixedly connected to the outer surface of the three limiting stops. Three slide rails are fixedly connected to the outer surface of the limiting support base. The three limiting stops are slidably connected to the outer surfaces of the three slide rails.

[0012] Preferably, a support bearing is sleeved inside the limiting support seat, and the triangular protrusion ring is sleeved on the inner surface of the support bearing.

[0013] Preferably, a heat insulation plate is fixedly connected to the outer surface of the limiting support seat, and the heat insulation plate is disposed on the outer surface of the hydraulic push rod.

[0014] Preferably, a V-shaped notch support is fixedly connected to the end of the outer surface of the limiting support away from the heat insulation plate, and two rollers are rotatably connected inside the V-shaped notch support.

[0015] Preferably, the limiting support and the ends of the outer surfaces of the rolls that are far apart from each other are both fixedly connected to a conveyor table, and the outer surfaces of the two conveyor tables are slidably connected to a perforated top rod.

[0016] Preferably, a first displacement push box and a second displacement push box are respectively provided on the outer surfaces of the two conveyor platforms.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. During the piercing and rolling process of steel pipes, a hydraulic push rod can be activated. The extension or retraction of the hydraulic push rod output shaft drives a limit stop to slide. The limit stop is connected to the triangular cam ring via a connecting rod. When one limit stop moves, it pushes the triangular cam ring to rotate via the connecting rod. As the triangular cam ring rotates, it simultaneously pulls the three limit stops to slide, thereby adjusting their distance from the steel pipe. During the piercing and rolling process, the three limit stops can be driven to slide close to the circumference of the steel pipe without clamping it. This prevents the rear end of the steel pipe from shaking when the front end is being processed, ensuring stable piercing and rolling operations and improving the final product quality.

[0019] Second, a heat insulation plate is installed on the surface of the limit support seat. The heat insulation plate is made of high-temperature resistant ceramic material. The output shaft of the hydraulic push rod slides inside the heat insulation plate. The heat insulation plate not only provides heat insulation protection for the hydraulic push rod, but also restricts the sliding trajectory of the hydraulic push rod output shaft, thereby ensuring the accuracy of the sliding limit movement of the limit stop seat. Attached Figure Description

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is an exploded view of the V-shaped notch support base of this utility model.

[0023] Figure 3 This is an exploded view of the limiting support seat connection of this utility model.

[0024] Figure 4 This is an exploded view of the limiting stop connection of this utility model.

[0025] Legend: 11. Limiting support seat; 12. Triangular protrusion ring; 13. Connecting rod; 14. Limiting stop seat; 15. Hydraulic push rod; 16. Slide rail; 17. Support bearing; 18. Heat insulation plate; 19. V-shaped notch support seat; 21. Roller; 22. Conveyor table; 23. Perforated push rod; 24. First displacement push box; 25. Second displacement push box. Detailed Implementation

[0026] This application provides a hot-working piercing rolling apparatus for bearing steel pipes, effectively solving the problem that existing devices generally lack a rear-end centering and limiting mechanism when processing the front end of the steel pipe. When the steel pipe just contacts the piercing rod, due to the lack of an effective rear-end centering and limiting mechanism, the piercing rod applies a concentrated pushing force to the front end of the steel pipe at the instant of contact. If there is no centering and limiting mechanism at the rear end, the force cannot be evenly transmitted to the entire steel pipe after the front end is subjected to force, resulting in uneven force distribution across the steel pipe. This causes the steel pipe to wobble, which slightly affects the accuracy of piercing rolling, leading to quality problems such as diameter deviation and roundness non-compliance. When the hydraulic push rod is activated, its output shaft extends or retracts, causing a limit stop to slide. The limit stop is connected to the triangular cam ring via a connecting rod. When one limit stop moves, the connecting rod pushes the triangular cam ring to rotate, and the rotation of the triangular cam ring synchronously pulls the three limit stops to slide, thus adjusting their distance from the steel pipe. During piercing and rolling of the steel pipe, the three limit stops can be driven to slide close to the circumference of the steel pipe without clamping it. This prevents the rear end of the steel pipe from wobbling while the front end is being processed, ensuring stable piercing and rolling operations and improving the final product quality. Example

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the technical solution in this application embodiment effectively solves the problem that existing devices generally lack a rear-end centering and limiting mechanism when processing the front end of a steel pipe. When the steel pipe just contacts the piercing rod, due to the lack of an effective rear-end centering and limiting mechanism, the piercing rod will apply a concentrated pushing force to the front end of the steel pipe at the moment of contact. At this time, if there is no centering and limiting mechanism at the rear end of the steel pipe, the force cannot be evenly transmitted to the entire steel pipe after the front end is subjected to force, resulting in uneven force on various parts of the steel pipe, and the steel pipe is prone to shaking. This phenomenon, where slight shaking slightly affects the precision of piercing and rolling, leads to quality issues such as deviation in steel pipe diameter and substandard roundness. The overall approach is as follows: A hot-working piercing and rolling device for bearing steel pipes includes a limiting support seat 11. A triangular protrusion ring 12 is rotatably connected inside the limiting support seat 11. Three connecting rods 13 are rotatably connected inside the triangular protrusion ring 12. Three limiting stops 14 are slidably connected to the outer surface of the limiting support seat 11. The three connecting rods 13 are rotatably connected to the three limiting stops 14 respectively. 4. Inside, a hydraulic push rod 15 is fixedly connected to the outer surface of the limiting support seat 11. The output shaft of the hydraulic push rod 15 is fixedly connected to the outer surface of three limiting stops 14. Three slide rails 16 are fixedly connected to the outer surface of the limiting support seat 11. The three limiting stops 14 are slidably connected to the outer surface of the three slide rails 16 respectively. When the steel pipe is subjected to piercing and rolling processing, the hydraulic push rod 15 can be activated. The output shaft of the hydraulic push rod 15 extends or retracts, thereby driving one of the limiting stops 14 to slide. The limiting stop 14 rotates with the connecting rod 13. The device is connected to the triangular protrusion ring 12 via a dynamic connection. When one of the limit stops 14 is displaced, the triangular protrusion ring 12 will be rotated via the connecting rod 13. As the triangular protrusion ring 12 rotates, it will simultaneously pull the three limit stops 14 to slide synchronously, thereby adjusting the distance between them and the steel pipe. When the steel pipe is being pierced and rolled, the three limit stops 14 can be driven to slide close to the circumferential surface of the steel pipe without clamping it. This prevents the rear end of the steel pipe from shaking when the front end of the steel pipe is being processed.

[0028] A support bearing 17 is sleeved inside the limiting support seat 11. A triangular protrusion ring 12 is sleeved on the inner surface of the support bearing 17. A heat insulation plate 18 is fixedly connected to the outer surface of the limiting support seat 11. The heat insulation plate 18 is set on the outer surface of the hydraulic push rod 15. Both the triangular protrusion ring 12 and the limiting stop 14 are made of the same high-temperature resistant material as the roll 21. The heat insulation plate 18 is installed on the surface of the limiting support seat 11. The heat insulation plate 18 is made of high-temperature resistant ceramic material. The output shaft of the hydraulic push rod 15 slides inside the heat insulation plate 18. The heat insulation plate 18 not only provides heat insulation protection for the hydraulic push rod 15, but also restricts the sliding trajectory of the output shaft of the hydraulic push rod 15, thereby ensuring the accuracy of the sliding limiting movement of the limiting stop 14.

[0029] A V-shaped notch support 19 is fixedly connected to the end of the outer surface of the limiting support 11 away from the heat insulation plate 18. Two rollers 21 are rotatably connected inside the V-shaped notch support 19. Conveyor tables 22 are fixedly connected to the ends of the outer surfaces of the limiting support 11 and the rollers 21 that are away from each other. Perforated push rods 23 are slidably connected to the outer surfaces of the two conveyor tables 22. A first displacement push box 24 and a second displacement push box 25 are respectively provided on the outer surfaces of the two conveyor tables 22. During the production and processing of the bearing steel pipe, the bearing steel pipe first undergoes a front-end heat treatment, being heated to... Upon reaching a specified temperature, the steel pipe undergoes a softening reaction. The steel pipe is then conveyed towards one end near the limit support 11. During this conveying process, it is pushed by the first displacement push box 24. The first displacement push box 24, driven by a hydraulic device, performs a linear reciprocating motion via an internally installed push rod. The push rod contacts and pushes the steel pipe, thus moving the steel pipe within the device. The conveyed and moving steel pipe contacts the surfaces of two opposing rotating rollers 21. (The V-shaped notch support 19 includes a motor and two meshing gears; mutually meshing gears are installed on the surfaces of the two rollers 21.) The steel pipe is rolled by the squeezing force of the two rollers 21. When one roller rotates clockwise, the other rotates counterclockwise, causing the two rollers 21 to rotate in opposite directions. During the rolling process, the steel pipe is continuously conveyed forward and comes into contact with the surface of the piercing rod 23. As the steel pipe is squeezed and rotated by the two rollers 21, the piercing rod 23 gradually penetrates deeper into the steel pipe, softening the steel pipe as it rotates and advances. The central part of the tube is gradually squeezed and expanded, causing the steel pipe to gradually change from a solid state to a hollow state, thus completing the piercing process. The second displacement push box 25 and the first displacement push box 24 work on a similar principle, using hydraulic components to push the piercing rod 23. After the piercing process is completed, the second displacement push box 25 will pull the piercing rod 23 to retract, and the first displacement push box 24 will also pull the steel pipe to slide back. At this time, the motor and arc push rod in the conveyor table 22 will push the steel pipe to another processing line for subsequent processing.

[0030] To address the problems existing in the prior art, this utility model provides a hot-working piercing and rolling device for bearing steel pipes. During the piercing and rolling process, a hydraulic push rod 15 can be activated. The output shaft of the hydraulic push rod 15 extends or retracts, thereby driving a limit stop 14 to slide. The limit stop 14 is connected to a triangular protrusion ring 12 via a rotatable connection with a connecting rod 13. When one limit stop 14 is displaced, it pushes the triangular protrusion ring 12 to rotate via the connecting rod 13. As the triangular protrusion ring 12 rotates, it synchronously pulls the three limit stops 14 to slide, thereby adjusting their distance from the steel pipe. During the piercing and rolling process, the three limit stops 14 can be driven to slide close to the circumference of the steel pipe without clamping it. This prevents the rear end of the steel pipe from wobbling when the front end is being processed, ensuring stable piercing and rolling operations and improving the final product quality.

[0031] Working principle:

[0032] In the first step, during the production and processing of the bearing steel pipe, the bearing steel pipe first undergoes a front-end heat treatment. After being heated to a specified temperature, the steel pipe undergoes a softening reaction and is conveyed towards one end near the limit support 11. During the conveying process, it is pushed by the first displacement push box 24. The first displacement push box 24, through its internal push rod, performs linear reciprocating motion under the drive of a hydraulic device. The push rod contacts and pushes the steel pipe, realizing the movement of the steel pipe within the device. The conveyed and moving steel pipe comes into contact with the surfaces of two opposing rotating rollers 21. (The V-shaped notch support 19 includes a motor and two meshing gears. The meshing gears are respectively installed on the surfaces of the two rollers 21. When one gear rotates clockwise, the other gear meshing with it rotates counterclockwise, thereby driving the two rollers 21 to rotate in opposite directions.) The steel pipe is squeezed and produced under the extrusion force of the two rollers 21. The rolling process involves deformation, during which the steel pipe is continuously conveyed forward. During this conveying process, the steel pipe comes into contact with the surface of the piercing mandrel 23. As the softened steel pipe is squeezed and rotated by the two rollers 21, the mandrel 23 gradually penetrates deeper into the pipe, gradually squeezing and expanding the loose central portion, transforming the steel pipe from a solid state to a hollow state, thus completing the piercing process. The second displacement push box 25 and the first displacement push box 24 operate on similar principles, using hydraulic components to push the piercing mandrel 23. After piercing, the second displacement push box 25 pulls the piercing mandrel 23 to retract, and the first displacement push box 24 pulls the steel pipe to slide back. At this point, the motor and arc-shaped push rod in the conveyor table 22 push the steel pipe to another processing line for further processing.

[0033] The second step involves activating the hydraulic push rod 15 during the piercing and rolling process of the steel pipe. The extension or retraction of the output shaft of the hydraulic push rod 15 drives a limit stop 14 to slide. The limit stop 14 is connected to the triangular protrusion ring 12 via a rotatable connection with the connecting rod 13. When one limit stop 14 moves, it pushes the triangular protrusion ring 12 to rotate via the connecting rod 13. As the triangular protrusion ring 12 rotates, it synchronously pulls all three limit stops 14 to slide, thus adjusting their distance from the steel pipe. This allows the three limit stops 14 to slide simultaneously during the piercing and rolling process of the steel pipe. The steel pipe is close to the circumference of the pipe but not clamped, thus preventing the rear end of the pipe from shaking when the front end is being processed. The triangular protrusion ring 12 and the limit stop 14 are made of the same high-temperature resistant material as the roll 21. A heat insulation plate 18 is installed on the surface of the limit support 11. The heat insulation plate 18 is made of high-temperature resistant ceramic material. The output shaft of the hydraulic push rod 15 slides inside the heat insulation plate 18. The heat insulation plate 18 not only provides heat insulation protection for the hydraulic push rod 15, but also limits the sliding trajectory of the output shaft of the hydraulic push rod 15, thereby ensuring the accuracy of the sliding limit movement of the limit stop 14.

[0034] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A hot-working piercing rolling apparatus for bearing steel pipes, comprising a limiting support seat (11), wherein a triangular protrusion ring (12) is rotatably connected inside the limiting support seat (11), characterized in that, The triangular protrusion ring (12) is rotatably connected to three connecting rods (13), and the outer surface of the limiting support seat (11) is slidably connected to three limiting stops (14). The three connecting rods (13) are rotatably connected to the three limiting stops (14) respectively. The outer surface of the limiting support seat (11) is fixedly connected to a hydraulic push rod (15), and the output shaft of the hydraulic push rod (15) is fixedly connected to the outer surface of the three limiting stops (14). Among them, the outer surface of the limiting support (11) is fixedly connected to three slide rails (16), and the three limiting stops (14) are respectively slidably connected to the outer surface of the three slide rails (16).

2. The bearing steel tube hot-working piercing rolling apparatus as described in claim 1, characterized in that, The limiting support seat (11) is internally fitted with a support bearing (17). The triangular protrusion ring (12) is sleeved on the inner surface of the support bearing (17).

3. The bearing steel tube hot-working piercing rolling apparatus as described in claim 2, characterized in that, A heat insulation plate (18) is fixedly connected to the outer surface of the limiting support (11); The heat insulation plate (18) is disposed on the outer surface of the hydraulic push rod (15).

4. The bearing steel pipe hot-working piercing rolling apparatus as described in claim 3, characterized in that, A V-shaped notch support (19) is fixedly connected to one end of the outer surface of the limiting support (11) away from the heat insulation plate (18). The V-shaped notch support (19) has two rollers (21) rotatably connected inside.

5. The bearing steel pipe hot-working piercing rolling apparatus as described in claim 4, characterized in that, The limiting support (11) and the outer surfaces of the roll (21) are both fixedly connected to a conveyor table (22) at the ends that are far apart from each other. Among them, the outer surfaces of the two conveyor platforms (22) are slidably connected with perforated top rods (23).

6. The bearing steel tube hot-working piercing rolling apparatus as described in claim 5, characterized in that, The outer surfaces of the two conveyor platforms (22) are respectively provided with a first displacement push box (24) and a second displacement push box (25).

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