A D-shaped steel pipe rolling device

Abstract

The application provides a D-shaped steel pipe rolling device, which comprises a rolling frame, a plurality of driving assemblies and an auxiliary supporting assembly. The inside of the rolling frame is provided with a plurality of groups of rollers, and the rollers in the same group comprise an upper roller and a lower roller. The auxiliary supporting assembly can assist in supporting the supporting columns on the upper roller and the lower roller, and support the annular grooves on the surface of the supporting columns, that is, the supporting columns are radially supported and axially supported, so as to resist the top pressure of the steel pipe body on the upper roller and the lower roller, reduce the effect of the top pressure on the connecting point between the supporting columns and the rolling frame, and further reduce the loss of the connecting part between the rollers and the rolling frame, thereby slowing down the loss speed of the connecting part between the rollers and the rolling frame.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe rolling, and in particular relates to a D-type steel pipe rolling apparatus. Background Technology

[0002] During the rolling process of the steel tube, when the steel tube is inserted from the front end of the rolling stand between the upper and lower rolls of the first group, it is subjected to the rolling pressure of the first and second rolling grooves. The upper and lower rolls forcefully push the end of the steel tube through all groups of rolls until the steel tube moves out of the last group of rolls at the end of the rolling stand. At this point, the top of the steel tube is pressed horizontally, forming a D-shaped steel tube. When the end of the steel tube enters between the upper and lower rolls of the same group, the upper and lower rolls forcefully squeeze and deform the end of the steel tube. The end of the steel tube exerts a top pressure on the upper and lower rolls, accelerating the wear of the roll connection components. Summary of the Invention

[0003] In view of this, the present invention aims to provide a D-type steel pipe rolling device to solve the technical problem that when the end of the steel pipe enters between the upper and lower rolls of the same group, the upper and lower rolls forcibly squeeze and deform the end of the steel pipe, and the end of the steel pipe will generate top pressure on the upper and lower rolls, which accelerates the wear of the roll connecting components.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A D-shaped steel pipe rolling device includes a rolling frame, multiple drive components, and auxiliary support components. The rolling frame has multiple sets of rolls inside, each set including an upper roll and a lower roll. Support columns are fixedly connected to both sides of the upper and lower rolls, and these support columns are rotatably connected to the rolling frame. Annular grooves are formed on the surface of each support column. Multiple drive components are mounted on the side walls of the rolling frame, and each drive component is used to rotate the upper and lower rolls of the same set. The auxiliary support components are mounted on the rolling frame and are used to support the annular grooves at different positions.

[0006] Furthermore, the auxiliary support assembly includes two slide rails and two pushing components. The two slide rails are fixedly connected to both sides of the inner wall of the rolling frame. Slide seats are slidably disposed on the surface of each slide rail. Multiple connecting seats are fixedly connected to the surface of each slide seat. Two support seats are fixedly connected to the surface of each connecting seat. A first arc-shaped groove is formed at the end of each support seat. The top and bottom ends of each support seat are connected to grippers via elastic support members. A second arc-shaped groove is formed on the side of each gripper near the support column. Multiple support balls are rotatably disposed on the inner walls of both the first and second arc-shaped grooves. The support balls roll in contact with the inner walls of the corresponding annular grooves. The grippers clamp and support the top and bottom ends of the support column. The two pushing components are disposed on both sides of the end of the rolling frame. The two pushing components are used to push and adjust the connecting seats at the ends of the two slide seats.

[0007] Furthermore, the pushing assembly includes two moving plates and a bidirectional synchronous cylinder. The two moving plates are fixedly connected to the two end surfaces of the connecting seat at the end of the slide. Each of the two moving plates is provided with an adjustment groove, which includes a first inclined groove and a first vertical groove. The two adjustment grooves are symmetrically arranged. Each of the two first vertical grooves is provided with an adjustment pin. Each of the two adjustment pins is fitted with a support rail. The support rail is fixedly connected to the end of the rolling frame. The bidirectional synchronous cylinder is fixedly connected to the side wall of the rolling frame.

[0008] Furthermore, a clamping and stabilizing assembly is provided on the side wall of the connecting seat. The clamping and stabilizing assembly includes a T-shaped movable seat and four limiting pins. The four limiting pins are respectively fixedly connected to the surfaces of four grippers located on the same connecting seat. The movable seat is slidably disposed on the side wall of the connecting seat. Two pairs of limiting blocks are fixedly connected to the first end a of the movable seat. The two pairs of limiting blocks are symmetrically arranged and provide limiting support for the limiting pins on the upper and lower sides of the support column. Two symmetrically arranged wedge blocks are fixedly connected to the second end of the movable seat. The ends of the two wedge blocks are respectively in contact with two adjusting pins. A first supporting spring is fixedly connected between the second end b of the movable seat and the connecting seat. A connecting plate is fixedly connected between the multiple movable seats.

[0009] Furthermore, the limiting block has a limiting slot on its limiting side, and the limiting slot has an arc-shaped overlapping surface.

[0010] Furthermore, two support pins are fixedly connected to the top and bottom of the support base. The support pins pass through the gripper and extend to the outside of the gripper. A second support spring is sleeved on the surface of the support pin. The two ends of the second support spring are fixedly connected to the gripper and the support base, respectively.

[0011] Furthermore, a connecting shaft is fixedly connected to the end of the support column, and an upper bearing seat is rotatably connected to the two connecting shaft surfaces at the upper roll. The upper bearing seat is fixedly connected to the top of the rolling frame, and a lower bearing seat is rotatably connected to the two connecting shaft surfaces at the lower roll. The lower bearing seat is fixedly connected to the bottom side of the rolling frame.

[0012] Furthermore, the drive assembly includes two follower gears and a drive motor. The drive motor is fixedly mounted on the side wall of the rolling frame. The output end of the drive motor is fixedly connected to a drive gear. The two follower gears are respectively fixedly connected to the ends of the connecting shafts of the upper roll and the lower roll. The two follower gears mesh with each other, and one of the two follower gears meshes with the drive gear.

[0013] Furthermore, the plurality of upper rolls are arranged from front to back on one side within the rolling chamber, and the rolling grooves on the plurality of upper rolls gradually become shallower from front to back until the rolling grooves disappear.

[0014] Furthermore, a connecting groove is provided on the surface of the connecting seat, and four sliders are slidably arranged in the connecting groove, with the four sliders respectively fixedly connected to four grippers.

[0015] Compared with the prior art, the D-type steel pipe rolling device of the present invention has the following advantages:

[0016] (1) The present invention can provide auxiliary support for the support columns on the upper and lower rolls through the auxiliary support components, and support the annular groove on the surface of the support columns, that is, to achieve radial support for the support columns and axial support for the support columns, so as to resist the top pressure of the steel tube body on the upper and lower rolls, reduce the effect of the top pressure on the connection point between the support column and the rolling frame, thereby reducing the wear at the connection between the roll and the rolling frame, which is beneficial to slow down the wear rate at the connection between the roll and the rolling frame.

[0017] (2) During the process of pushing the connecting seat, the bidirectional synchronous cylinder is activated. The bidirectional synchronous cylinder pulls the two adjusting pins synchronously. The two adjusting pins approach each other under the limiting support of the support rail. The two adjusting pins move in the two adjusting grooves. The adjusting pin moves from the first inclined groove to the first vertical groove. During the movement of the adjusting pin in the first inclined groove, it pushes the moving plate. The moving plate drives the connecting seat at the end of the slide to move. The connecting seat drives the slide to move synchronously. The slide drives multiple connecting seats to move synchronously until the adjusting pin moves from the first inclined groove to the first vertical groove, and stops pushing the connecting seat and limits the position of the connecting seat. At this time, the support seat and the gripper are in the state of clamping and supporting the support column.

[0018] As the adjusting pin moves within the first vertical groove, it presses against the inclined surface of the wedge block, pushing the wedge block forward. Simultaneously, the wedge block moves the moving seat, causing the limiting block to engage with and limit the limiting pin. When the adjusting pin reaches the end of the wedge block, it limits the position of the wedge block. The wedge block and the moving seat together maintain the limiting block's engagement with the limiting pin, thus stabilizing the clamping state of the clamping pin and ensuring stable clamping of the support column. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the first overall structure of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the second overall structure of a D-type steel pipe rolling device according to an embodiment of the present invention:

[0022] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0023] Figure 4 This is a schematic diagram of the upper and lower rolls of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0024] Figure 5 This is a first structural schematic diagram of the movable seat, support seat, and gripper of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0025] Figure 6 This is a second structural schematic diagram of the movable seat, support seat, and gripper of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the auxiliary support assembly of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0027] Figure 8 for Figure 7 Enlarged view of section B;

[0028] Figure 9 This is a schematic diagram of the slide block and slide rail of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0029] Figure 10 This is a front view of the upper and lower rolls of a D-type steel pipe rolling device according to an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the structure of a D-shaped steel pipe body in a D-shaped steel pipe rolling device according to an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the connecting seat, support seat, and gripper of a D-type steel pipe rolling device according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Rolling stand; 2-Upper roll; 3-Lower roll; 4-Support column; 5-Annular groove; 6-First rolling groove; 7-Second rolling groove; 8-Slide rail; 9-Slide block; 10-Connecting seat; 11-Support seat; 12-First arc groove; 13-Gripper; 14-Second arc groove; 15-Support ball; 16-Moving plate; 17-Dual synchronous cylinder; 18-Adjusting groove; 1801-First inclined groove; 1802-First vertical groove; 19-Adjusting pin; 20-Support rail 21-Moving seat; 22-Limiting pin; 23-Limiting block; 24-Wedge block; 25-First support spring; 26-Connecting plate; 27-Limiting slot; 2701-Arc-shaped overlapping surface; 28-Supporting pin; 29-Second support spring; 30-Connecting shaft; 31-Upper bearing seat; 32-Lower bearing seat; 33-Follower gear; 34-Drive motor; 35-Drive gear; 36-Connecting slide; 37-Slider; 38-L-shaped connecting frame; 39-D-shaped steel pipe body. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 12 As shown, in one embodiment, a D-shaped steel pipe rolling device includes a rolling frame 1, multiple drive components and auxiliary support components. The rolling frame 1 is internally provided with multiple sets of rolls, and the rolls in the same set include an upper roll 2 and a lower roll 3. Support columns 4 are fixedly connected to both sides of the upper roll 2 and the lower roll 3. The support columns 4 are rotatably connected to the rolling frame 1. Annular grooves 5 are formed on the surface of the support columns 4. Multiple drive components are arranged on the side wall of the rolling frame 1. The drive components are respectively used to rotate the upper roll 2 and the lower roll 3 in the same set. The auxiliary support components are arranged on the rolling frame 1 and are used to support the annular grooves 5 at different positions.

[0039] Specifically, multiple upper rolls 2 are arranged from front to back on one side inside the cavity of the rolling stand 1. The surface of the upper rolls 2 has a first rolling groove 6, and the multiple first rolling grooves 6 on the multiple upper rolls 2 gradually become shallower from front to back until the first rolling grooves 6 disappear. The surface of the multiple lower rolls 3 has a second rolling groove 7.

[0040] It should be understood that when the steel tube is inserted from the front end of the rolling stand 1 between the upper roll 2 and the lower roll 3 of the first group, it is subjected to the rolling pressure of the first rolling groove 6 and the second rolling groove 7. The upper roll 2 and the lower roll 3 will forcibly roll and push the end of the steel tube until it passes through all groups of rolls. After the steel tube moves out of the last group of rolls at the end of the rolling stand 1, the top end of the steel tube will be pressed horizontally, so that the steel tube forms a D-shaped steel tube 39. When the end of the steel tube enters between the upper roll 2 and the lower roll 3 of the same group, the upper roll 2 and the lower roll 3 forcibly squeeze and deform the end of the steel tube. The end of the steel tube will generate top pressure on the upper roll 2 and the lower roll 3, which accelerates the wear of the roll connecting parts. This embodiment can solve the above problems. The specific reasons are as follows:

[0041] The auxiliary support assembly can provide auxiliary support for the support columns 4 on the upper roll 2 and the lower roll 3, and also support the annular groove 5 on the surface of the support column 4. This provides radial support for the support column 4 and axial support for the support column 4, so as to resist the top pressure of the steel tube body on the upper roll 2 and the lower roll 3, reduce the effect of the top pressure on the connection point between the support column 4 and the rolling frame 1, and thus reduce the wear at the connection point between the roll and the rolling frame 1.

[0042] like Figure 1 , Figures 5 to 8 As shown, in one embodiment, the auxiliary support assembly includes two slide rails 8 and two pushing assemblies. The two slide rails 8 are fixedly connected to both sides of the inner wall of the rolling frame 1. Slide seats 9 are slidably arranged on the surface of each of the two slide rails 8. Multiple connecting seats 10 are fixedly connected to the surface of the slide seats 9. Two support seats 11 are fixedly connected to the surface of the connecting seats 10. A first arc-shaped groove 12 is opened at the end of the support seat 11. The top and bottom ends of the support seat 11 are connected to grippers 13 through elastic support members. A second arc-shaped groove 14 is opened on the side of the gripper 13 near the support column 4. Multiple support balls 15 are rotatably arranged on the inner walls of the first arc-shaped groove 12 and the second arc-shaped groove 14. The support balls 15 roll in contact with the inner wall of the annular groove 5 at the corresponding position. The grippers 13 clamp and support the top and bottom ends of the support column 4. The two pushing assemblies are arranged on both sides of the end of the rolling frame 1. The two pushing assemblies are used to push and adjust the connecting seats 10 at the ends of the two slide seats 9. It should be understood that before rolling the steel pipe, the slide 9 is pushed by the push assembly. The slide 9 drives multiple connecting seats 10 to move synchronously. The connecting seats 10 drive the support seat 11 and the gripper 13 to move synchronously. The gripper 13 will first contact the support column 4. Under the pressure of the support column 4, the gripper 13 at the top and bottom of the support seat 11 will be squeezed apart until the support seat 11 presses against the support column 4. The gripper 13 at the top and bottom of the support seat 11 is at the top and bottom of the support column 4. Under the support of the elastic support, the gripper 13 at the top and bottom of the support seat 11 clamps the support column 4. The support spheres on the inner walls of the first arc groove 12 and the second arc groove 14 The ball 15 rolls in contact with the inner wall of the annular groove 5 at the corresponding position. The ball 15 rolls inside the annular groove 5, which provides radial support for the support column 4 on the one hand, and axial support for the support column 4 on the other hand. Thus, the axial support for the support column 4 is achieved. The auxiliary support assembly provides both radial support for the upper roll 2 and the lower roll 3 and axial support for the upper roll 2 and the lower roll 3, reducing the support pressure on the upper roll 2 and the lower roll 3 at the rotation connection point of the rolling frame 1, thereby reducing the wear on the upper roll 2 and the lower roll 3 at the rotation connection point of the rolling frame 1.

[0043] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, in one embodiment, the pushing component includes two moving plates 16 and a bidirectional synchronous cylinder 17. The two moving plates 16 are fixedly connected to the two end surfaces of the connecting seat 10 at the end of the slide 9. Each of the two moving plates 16 is provided with an adjustment groove 18, which includes a first inclined groove 1801 and a first vertical groove 1802. The two adjustment grooves 18 are symmetrically arranged. Each of the two first vertical grooves 1802 is provided with an adjustment pin 19. Each of the two adjustment pins 19 is fitted with a support rail 20. The support rail 20 is fixedly connected to the end of the rolling frame 1. The bidirectional synchronous cylinder 17 is fixedly connected to the side wall of the rolling frame 1. It should be understood that during the process of pushing the connecting seat 10, the bidirectional synchronous cylinder 17 is activated. The bidirectional synchronous cylinder 17 pulls the two adjusting pins 19 synchronously. Under the limiting support of the support rail 20, the two adjusting pins 19 approach each other and move within the two adjusting grooves 18. The adjusting pins 19 move from the first inclined groove 1801 to the first vertical groove 1802. During the movement of the adjusting pins 19 within the first inclined groove 1801, they push the moving plate 16. The moving plate 16 drives the connecting seat 10 at the end of the slide 9 to move. The connecting seat 10 synchronously drives the slide 9 to move. The slide 9 synchronously drives multiple connecting seats 10 to move synchronously until the adjusting pins 19 move from the first inclined groove 1801 to the first vertical groove 1802, stopping the pushing of the connecting seat 10 and limiting the position of the connecting seat 10. At this time, the support seat 11 and the gripper 13 are in a state of clamping and supporting the support column 4.

[0044] Specifically, an L-shaped connecting bracket 38 is fixedly connected between the bidirectional synchronizing cylinder 17 and the adjusting pin 19.

[0045] like Figures 5 to 8As shown, in one embodiment, a clamping and stabilizing assembly is provided on the side wall of the connecting seat 10. The clamping and stabilizing assembly includes a T-shaped movable seat 21 and four limiting pins 22. The four limiting pins 22 are respectively fixedly connected to the surfaces of four grippers 13 located on the same connecting seat 10. The movable seat 21 is slidably disposed on the side wall of the connecting seat 10. Two pairs of limiting blocks 23 are fixedly connected to the first end a of the movable seat 21. The two pairs of limiting blocks 23 are symmetrically arranged, and the two pairs of limiting blocks 23 respectively limit and support the limiting pins 22 on the upper and lower sides of the support column 4. Two symmetrically arranged wedge blocks 24 are fixedly connected to the second end b of the movable seat 21. The ends of the two wedge blocks 24 are respectively in contact with two adjusting pins 19. A first supporting spring 25 is fixedly connected between the second end b of the movable seat 21 and the connecting seat 10. A connecting plate 26 is fixedly connected between multiple movable seats 21. It should be understood that during the movement of the adjusting pin 19 within the first vertical groove 1802, the adjusting pin 19 will press against the inclined surface of the wedge block 24, pushing the wedge block 24. The wedge block 24 will simultaneously drive the moving seat 21 to move, causing the limiting block 23 to overlap and limit the limiting pin 22. Until the adjusting pin 19 moves to the end of the wedge block 24, the adjusting pin 19 limits the position of the wedge block 24. The wedge block 24 and the moving seat 21 together maintain the limiting block 23 overlapping and limiting the limiting pin 22, so that the clamping state of the limiting pin 22 on the gripper 13 is stabilized, and the gripper 13 maintains the stable clamping of the support column 4.

[0046] The limiting block 23 has a limiting slot 27 on its limiting side, and the limiting slot 27 has an arc-shaped overlapping surface 2701. It should be understood that by setting the limiting slot 27, it is convenient to overlap with the surface of the limiting pin 22, and by setting the arc-shaped overlapping surface 2701, the limiting slot 27 fits against the surface of the limiting pin 22.

[0047] like Figure 5 As shown, in one embodiment, two support pins 28 are fixedly connected to the top and bottom of the support base 11. The support pins 28 pass through the gripper 13 and extend to the outside of the gripper 13. A second support spring 29 is sleeved on the surface of the support pin 28, and the two ends of the second support spring 29 are fixedly connected to the gripper 13 and the support base 11, respectively. It should be understood that the second support spring 29 serves to support and maintain the position of the gripper 13 relative to the support base 11.

[0048] like Figure 2 and Figure 4As shown, in one embodiment, a connecting shaft 30 is fixedly connected to the end of the support column 4. Upper bearing seats 31 are rotatably connected to the surfaces of the two connecting shafts 30 at the upper roll 2, and the upper bearing seats 31 are fixedly connected to the top of the rolling frame 1. Lower bearing seats 32 are rotatably connected to the surfaces of the two connecting shafts 30 at the lower roll 3, and the lower bearing seats 32 are fixedly connected to the bottom side of the rolling frame 1. It should be understood that the arrangement of the upper bearing seats 31 and lower bearing seats 32 achieves a rotatable connection between the connecting shafts 30 and the rolling frame 1, thereby indirectly achieving a rotatable connection between the support column 4 and the rolling frame 1, and rotatably connecting the rolls within the inner cavity of the rolling frame 1.

[0049] like Figure 1 and Figure 4 As shown, in one embodiment, the drive assembly includes two follower gears 33 and a drive motor 34. The drive motor 34 is fixedly mounted on the side wall of the rolling frame 1. The output end of the drive motor 34 is fixedly connected to a drive gear 35. The two follower gears 33 are respectively fixedly connected to the ends of the connecting shaft 30 of the upper roll 2 and the connecting shaft 30 of the lower roll 3. The two follower gears 33 mesh with each other, and one of the two follower gears 33 meshes with the drive gear 35. It should be understood that during the rolling process of the steel pipe, the drive motor 34 is started, which drives the drive gear 35 to rotate. The drive gear 35 drives one of the follower gears 33 to rotate. The two follower gears 33 mesh with each other and rotate in opposite directions, which in turn drives the two connecting shafts 30 to rotate in opposite directions. The two follower gears 33 rotate in the first direction c and the second direction d, respectively. The two connecting shafts 30 synchronously drive the support columns 4 at two positions to rotate, which in turn drives the upper roll 2 and the lower roll 3 to rotate in the first direction c and the second direction d, respectively, rolling the end of the steel pipe between the upper roll 2 and the lower roll 3. While conveying the steel pipe, the steel pipe is rolled and deformed.

[0050] like Figure 12 As shown, in one embodiment, a connecting groove 36 is formed on the surface of the connecting seat 10, and four sliders 37 are slidably disposed in the connecting groove 36. The four sliders 37 are respectively fixedly connected to four grippers 13. It should be understood that the grippers 13 are slidably connected to the surface of the connecting seat 10 by the sliding connection between the sliders 37 and the connecting groove 36.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A D-type steel pipe rolling device, characterized in that: The device includes a rolling frame (1), multiple drive components and auxiliary support components. The rolling frame (1) is equipped with multiple sets of rolls inside. The rolls in the same set include an upper roll (2) and a lower roll (3). Support columns (4) are fixedly connected to both sides of the upper roll (2) and the lower roll (3). The support columns (4) are rotatably connected to the rolling frame (1). Annular grooves (5) are opened on the surface of the support columns (4). Multiple drive components are set on the side wall of the rolling frame (1). The drive components are used to rotate the upper roll (2) and the lower roll (3) in the same set. The auxiliary support components are set on the rolling frame (1). The auxiliary support components are used to support the annular grooves (5) at different positions. The auxiliary support assembly includes two slide rails (8) and two pushing components. The two slide rails (8) are fixedly connected to both sides of the inner wall of the rolling frame (1). Slide seats (9) are slidably arranged on the surface of each of the two slide rails (8). Multiple connecting seats (10) are fixedly connected to the surface of each slide seat (9). Two support seats (11) are fixedly connected to the surface of each connecting seat (10). The end of each support seat (11) is provided with a first arc-shaped groove (12). The top and bottom ends of each support seat (11) are connected to grippers (13) through elastic support members. The gripper (13) has a second arc-shaped groove (14) on the side near the support column (4). Multiple support balls (15) are rotatably arranged on the inner walls of the first arc-shaped groove (12) and the second arc-shaped groove (14). The support balls (15) roll in contact with the inner wall of the annular groove (5) at the corresponding position. The gripper (13) clamps and supports the top and bottom ends of the support column (4). The two pushing components are arranged on both sides of the end of the rolling frame (1). The two pushing components are used to push and adjust the connecting seats (10) at the ends of the two slides (9). The pushing assembly includes two moving plates (16) and a bidirectional synchronous cylinder (17). The two moving plates (16) are fixedly connected to the two ends of the connecting seat (10) at the end of the slide (9). Each of the two moving plates (16) is provided with an adjustment groove (18). The adjustment groove (18) includes a first inclined groove (1801) and a first vertical groove (1802). The two adjustment grooves (18) are symmetrically arranged. Each of the two first vertical grooves (1802) is provided with an adjustment pin (19). Each of the two adjustment pins (19) is fitted with a support rail (20). The support rail (20) is fixedly connected to the end of the rolling frame (1). The bidirectional synchronous cylinder (17) is fixedly connected to the side wall of the rolling frame (1). A clamping and stabilizing assembly is provided on the side wall of the connecting seat (10). The clamping and stabilizing assembly includes a T-shaped movable seat (21) and four limiting pins (22). The four limiting pins (22) are respectively fixedly connected to the surfaces of four grippers (13) located on the same connecting seat (10). The movable seat (21) is slidably disposed on the side wall of the connecting seat (10). Two pairs of limiting blocks (23) are fixedly connected to the first end a of the movable seat (21). The two pairs of limiting blocks (23) are symmetrically arranged. The two limit blocks (23) respectively limit the limit pins (22) on the upper and lower sides of the support column (4). The second end b of the moving seat (21) is fixedly connected to two symmetrically arranged wedge blocks (24). The ends of the two wedge blocks (24) are respectively in contact with two adjusting pins (19). The second end b of the moving seat (21) is fixedly connected to the connecting seat (10) with a first support spring (25). A connecting plate (26) is fixedly connected between multiple moving seats (21).

2. The D-type steel pipe rolling device according to claim 1, characterized in that: The limiting block (23) has a limiting slot (27) on its limiting side, and the limiting slot (27) has an arc-shaped overlapping surface (2701).

3. The D-type steel pipe rolling device according to claim 1, characterized in that: The support base (11) has two support pins (28) fixedly connected to its top and bottom. The support pins (28) pass through the gripper (13) and extend to the outside of the gripper (13). A second support spring (29) is sleeved on the surface of the support pin (28). The two ends of the second support spring (29) are fixedly connected to the gripper (13) and the support base (11) respectively.

4. A D-type steel pipe rolling apparatus according to any one of claims 1 to 3, characterized in that: The end of the support column (4) is fixedly connected to a connecting shaft (30). The two connecting shafts (30) at the upper roll (2) are rotatably connected to an upper bearing seat (31). The upper bearing seat (31) is fixedly connected to the top of the rolling frame (1). The two connecting shafts (30) at the lower roll (3) are rotatably connected to a lower bearing seat (32). The lower bearing seat (32) is fixedly connected to the bottom side of the rolling frame (1).

5. A D-type steel pipe rolling device according to claim 4, characterized in that: The drive assembly includes two follower gears (33) and a drive motor (34). The drive motor (34) is fixedly mounted on the side wall of the rolling frame (1). The output end of the drive motor (34) is fixedly connected to a drive gear (35). The two follower gears (33) are respectively fixedly connected to the ends of the connecting shaft (30) of the upper roll (2) and the connecting shaft (30) of the lower roll (3). The two follower gears (33) mesh with each other, and one of the two follower gears (33) meshes with the drive gear (35).

6. A D-type steel pipe rolling device according to claim 5, characterized in that: Multiple upper rolls (2) are arranged from front to back on one side in the rolling cavity, and the rolling grooves on the multiple upper rolls (2) gradually become shallower from front to back until the rolling grooves disappear.

7. A D-type steel pipe rolling device according to claim 1, characterized in that: The surface of the connecting seat (10) is provided with a connecting groove (36), and four sliders (37) are slidably arranged in the connecting groove (36). The four sliders (37) are respectively fixedly connected to four grippers (13).

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