Hot rolling device for seamless steel pipe production

Abstract

The invention belongs to the technical field of hot-rolled steel pipes, particularly relates to a hot-rolling device for seamless steel pipe production, and aims to solve the problems that a sizing rod is very difficult to pull out and even scratches a pipe wall during rolling of the seamless steel pipe in the prior art, the hot-rolling device comprises a rack seat fixed on the ground and a rolling system fixed above the rack seat, a mounting base is fixed to the discharging side of the rack base, a sliding bearing base of a long-strip-shaped structure is slidably connected to the upper surface of the mounting base, and the sliding bearing base can rotate by 15-30 degrees when sliding to the end away from the rolling system. According to the sizing device, after rolling and sizing are finished, a formed steel pipe can be removed from the outer wall of the sizing abutting rod in time at a proper temperature, and therefore the situation that the formed steel pipe is bonded to the outer wall of the sizing abutting rod for a long time, and consequently material returning cannot be achieved can be prevented; and the removed formed steel pipe can be discharged to an open position on the side surface of the rack seat, so that other equipment for assisting in forming and cooling the steel pipe can be conveniently arranged.

Description

Technical Field

[0001] The present invention relates to the technical field of hot-rolled steel pipes, and particularly to a hot-rolling device for seamless steel pipe production. Background Art

[0002] Hot-rolled seamless steel pipe is a non-welded steel pipe produced by directly piercing a high-temperature round rod. With its high strength, good high-temperature and pressure resistance performance, hot-rolled seamless steel pipe is widely used in various key fields, especially suitable for environments with high pressure, high temperature and strength requirements. Its manufacturing process is complex and requires strict requirements, but the final product has good performance in terms of mechanical properties, dimensional accuracy and corrosion resistance.

[0003] After retrieval, in the existing seamless steel pipe rolling mills, after rolling, the sizing rod and the formed steel pipe are both conveyed to a specific pipe-pulling machine for separating the formed steel pipe and the sizing rod. During this period, once the cooling is excessive or an accident occurs, it is very easy to cause the sizing rod to be extremely difficult to pull out due to excessive thermal expansion and contraction. Therefore, we propose a new type of rolling mill that can quickly pull out the rod after rolling. Summary of the Invention

[0004] Aiming at the technical problem that in the existing seamless steel pipe rolling, it is very difficult to pull out the sizing rod or even scratch the pipe wall, the present invention adopts the following technical solutions:

[0005] A hot-rolling device for seamless steel pipe production includes a frame base fixed on the ground and a rolling system fixed above it. An installation base is fixed on the discharge side of the frame base. A long-strip-shaped sliding bearing seat is slidably connected to the upper surface of the installation base, and the sliding bearing seat can rotate 15 - 30 degrees when sliding to the end far from the rolling system. A support column 1 is fixed at the end of the upper surface of the sliding bearing seat far from the frame base, and a C-shaped sliding pipe with an upward opening is fixed in the middle on the side of the support column 1 close to the rolling system. The C-shaped sliding pipe is in the same direction as the rolling center line of the length direction of the sliding bearing seat "i.e., the direction in which the formed steel pipe spirally advances", and a sliding push plate is slidably connected in the C-shaped sliding pipe. The plate surface of the sliding push plate is perpendicular to the rolling center line; a sizing abutting rod extending horizontally towards the rolling point is fixed at the top of the support column 1, and a shaped perforation through which the sizing abutting rod passes is opened in the middle of the sliding push plate.

[0006] Preferably, a plurality of annular joints are reserved on the circumferential outer wall of the sizing abutting rod, a plurality of spherical grooves are opened on the circumferential outer wall of the annular joints, and ball bearings are embedded in the spherical grooves; centripetal cylindrical grooves are opened at the bottom of the spherical grooves, and a pressing spring is fixed at the bottom of each cylindrical groove, and the pressing spring is arranged between the bottom of the cylindrical groove and the surface of the ball bearing; during rolling and blanking, the friction between the inner wall of the formed steel pipe and the outer wall of the sizing abutting rod can be reduced, so that the formed steel pipe can be more easily blanked.

[0007] Preferably, symmetric tapered roller bearings are respectively clamped on both sides of the I-shaped perforation, and a same rotating blanking ring is rotatably inserted between the two tapered roller bearings. An annular abutting plate is reserved on one side of the rotating blanking ring close to the rolling system. The outer circumferential wall of the other end of the rotating blanking ring is sleeved and fixed with a driven worm gear ring. The inner circumferential wall of the rotating blanking ring is larger than the outer diameter of the annular section, and there is a gap between the inner circumferential wall of the rotating blanking ring and the ball; thus, it can be ensured that the whole rotating blanking ring can slide back and forth on the outer circumferential wall of the sizing abutting rod, and then the formed steel pipe sleeved on the outer wall of the sizing abutting rod after rolling can be smoothly unloaded.

[0008] Preferably, a convex platform slider is welded and fixed at the bottom end of the sliding push plate, and the convex platform slider is slidably connected in the C-shaped sliding tube. The whole convex platform slider is of a cylindrical structure, and a through threaded hole is opened at the end of the convex platform slider. A round hole for fixing the C-shaped sliding tube is opened in the middle of the first support column; on the side of the first support column far from the rolling system, a motor bracket is fixed, and a servo motor is fixed at the top of the motor bracket. The top end of the output shaft of the servo motor is fixed with a transmission screw rod through a coupling, and the transmission screw rod is screwed in the threaded hole in the middle of the convex platform slider. By controlling the rotation of the transmission screw rod, the sliding push plate and the convex platform slider can be driven to move back and forth on the C-shaped sliding tube, and then the blanking work is completed.

[0009] Preferably, a first roller bracket and a first shaft rod bracket are respectively fixed on the side of the sliding push plate close to the driven worm gear ring and close to the lower part. A driving gear is rotatably connected in the first roller bracket; a worm is rotatably connected in the first shaft rod bracket, and the worm meshes with the driven worm gear ring. One end of the worm far from the driven worm gear ring is fixed with a driven gear meshing with the driving gear; a rack meshing with the driving gear is embedded at the opening near the top end of the outer wall of the C-shaped sliding tube.

[0010] Preferably, a plurality of roller grooves are opened on the outer circumferential wall of the convex platform slider, and rollers are arranged in the roller grooves. The axis line of the roller is skew perpendicular to the axis line of the convex platform slider, so as to reduce the resistance when the convex platform slider slides in the C-shaped sliding tube. A plurality of leakage holes are opened at the bottom of the groove of the C-shaped sliding tube, and residues generated during rolling, such as scale and cooling water, can be discharged in time; a snap ring mounting seat is fixed at the top end of the first support column, and a rod abutting fixing part is clamped and fixed in the middle of the snap ring mounting seat for tightly horizontally inserting and fixing the sizing abutting rod above the sliding bearing seat.

[0011] Preferably, a hexagonal counterbore is opened at one end of the sizing abutting rod close to the rolling system, and a hexagonal prism is inserted in the hexagonal counterbore. One end of the hexagonal prism far from the sizing abutting rod is fixed with a through center ejector block, and the outer diameter of the through center ejector block is larger than the outer diameter of the annular section, ensuring that the inner wall of the formed steel pipe only contacts the balls protruding from the surface of the annular section.

[0012] Preferably, the rolling system includes a roll stand fixed above the frame base. An inclined roll is arranged in the roll stand, and the through-center top block is located at the rolling center position between the middle two inclined rolls.

[0013] Preferably, a first shaft column and a strip-shaped shaft column are respectively fixed to the lower surface of the sliding bearing seat near the middle of both ends, and the strip-shaped shaft column is located at one end close to the rolling system. A secondary strip hole and an anti-twist strip hole for the first shaft column and the strip-shaped shaft column to pass through correspondingly are formed in the mounting base; a sliding bearing seat is arranged on the circumferential outer wall near the bottom end of the first shaft column passing through the secondary strip hole, and symmetrical angle steel slide rails are respectively arranged on both sides of the secondary strip hole on the lower surface of the mounting base. The sliding bearing seat is slidably connected between the two angle steel slide rails. A hydraulic jack is fixed to one end of the lower surface of the mounting base away from the frame base, and the end of the extension rod of the hydraulic jack is fixed to the side surface of the sliding bearing seat; a large gear is fixed to the bottom end of the first shaft column, a driving motor is fixed to the side of the sliding bearing seat away from the hydraulic jack, and a small gear meshing with the large gear is fixed to the top end of the output shaft of the driving motor; a sector-shaped rotating hole extending towards the front of the whole device is formed in the side surface of the anti-twist strip hole near one end of the secondary strip hole; the central angle of the sector-shaped rotating hole is 15 - 30 degrees, and a T-shaped guide wheel frame is fixed to the upper surface of the mounting base in front of the roll stand, and a plurality of discharging guide wheels are arranged on the T-shaped guide wheel frame.

[0014] Preferably, two electric push rods are fixed to one end of the upper surface of the mounting base near the rolling system, and the ends of the extension rods of the two electric push rods are fixed to the same horizontal lifting support plate; this prevents the sizing resisting rod from being bent due to the excessive weight of the formed steel pipe.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By arranging a sliding push plate slidably connected in the C-shaped sliding pipe, after the rolling and sizing are completed, the formed steel pipe can be timely removed from the outer wall of the sizing resisting rod at an appropriate temperature, thereby preventing the formed steel pipe from being adhesively bonded to the outer wall of the sizing resisting rod for a long time and causing failure to discharge the material. With the sliding bearing seat that can rotate integrally, the removed formed steel pipe can be unloaded to an empty position on the side of the frame base, facilitating the setting of other auxiliary equipment for steel pipe forming and cooling.

[0017] 2. Since a worm and worm gear mechanism linked with the sliding push plate is arranged, the rotating discharging ring can be driven to rotate simultaneously during the sliding of the discharging, so that the formed steel pipe is discharged in a spiral manner during the material discharging, thereby reducing the probability of the inner wall of the formed steel pipe being scratched and also reducing the discharging resistance.

[0018] 3. Through the fan-shaped rotating holes and the sliding bearing seat that can rotate and slide backward, when the rolled steel pipe needs to be removed, it is only necessary to control the extension rod of the hydraulic push rod to retract, so as to pull the sliding bearing seat and the formed steel pipe on the sizing rod above it out of the rolling system as a whole, and then transport the removed formed steel pipe to an open position for the next auxiliary forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention before rolling;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention after rolling is completed;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention after rolling when viewed from above;

[0022] Figure 4 It is a structural schematic diagram of the material return mechanism in the present invention when it is in operation;

[0023] Figure 5 It is a schematic diagram of the assembly structure of the rotating stripping ring in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the sliding push plate in the pushing process of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the installation base in the present invention;

[0026] Figure 8 It is a schematic diagram of the overall half-section structure of the rotating material stripping ring and the sizing stop rod in the present invention.

[0027] In the figure: 1, frame seat; 2, C-shaped slide tube; 201, rack; 3, sliding bearing seat; 301, support column 1; 302, shaft column 1; 303, strip shaft column; 4, mounting base; 401, anti-twist strip hole; 402, fan-shaped rotating hole; 403, secondary strip hole; 5, hydraulic push rod; 6, motor frame; 7, servo motor; 8, rod fixing piece; 9, snap ring mounting seat; 10, driven worm ring; 11, sliding push plate; 1101, roller frame 1; 1102, shaft Frame 1; 1103, boss slider; 1104, worm; 1105, I-shaped perforation; 1106, tapered roller bearing; 12, ring section; 13, electric push rod; 14, lifting support plate; 15, discharge guide wheel; 16, T-shaped guide wheel frame; 17, sizing rod; 18, through-hole block; 19, roller frame; 20, oblique roller; 21, formed steel pipe; 22, angle steel slide rail; 23, sliding bearing seat; 24, rotating unloading ring; 25, ball; 26, transmission screw. DETAILED DESCRIPTION

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In this embodiment, referring to Figures 1-8 , a hot rolling device for seamless steel pipe production includes a frame base 1 fixed to the ground and a rolling system fixed above it. An installation base 4 is fixed on the discharge side of the frame base 1. A sliding bearing seat 3 with a long strip structure is slidably connected to the upper surface of the installation base 4, and when the sliding bearing seat 3 slides to the end far from the rolling system, it can rotate 15-30 degrees. A first support column 301 is fixed to the end of the upper surface of the sliding bearing seat 3 far from the frame base 1, and a C-shaped sliding tube 2 with an upward opening is fixed in the middle of the side of the first support column 301 close to the rolling system. The C-shaped sliding tube 2 is in the same direction as the rolling center line of the length direction of the sliding bearing seat 3, that is, the direction in which the formed steel pipe 21 spirally advances, and a sliding push plate 11 is slidably connected in the C-shaped sliding tube 2. The plate surface of the sliding push plate 11 is perpendicular to the rolling center line; the top of the first support column 301 is fixed with a sizing and resisting rod 17 extending horizontally towards the rolling point, and an I-shaped through hole 1105 through which the sizing and resisting rod 17 passes is opened in the middle of the sliding push plate 11.

[0030] Specifically, by setting the sliding push plate 11 slidably connected in the C-shaped sliding tube 2, after the sizing of rolling is completed, the formed steel pipe 21 can be timely removed from the outer wall of the sizing and resisting rod 17 at an appropriate temperature, so as to prevent the formed steel pipe 21 from being adhesively connected to the outer wall of the sizing and resisting rod 17 for a long time, resulting in the inability to discharge the material. Cooperating with the sliding bearing seat 3 that can rotate as a whole, the removed formed steel pipe 21 can be discharged to an open position on the side of the frame base 1, which is convenient for setting other equipment for assisting in the forming and cooling of the steel pipe.

[0031] In the present invention, a plurality of annular sections 12 are reserved on the circumferential outer wall of the sizing and resisting rod 17, and a plurality of spherical grooves are opened on the circumferential outer wall of the annular sections 12, and ball bearings 25 are embedded in the spherical grooves; centripetal cylindrical grooves are opened at the bottom of the spherical grooves, and a pressing spring is fixed at the bottom of each cylindrical groove, and the pressing spring is arranged between the bottom of the cylindrical groove and the surface of the ball bearing 25; by setting the pressing spring and the ball bearing 25, the friction between the inner wall of the formed steel pipe 21 and the outer wall of the sizing and resisting rod 17 can be reduced during rolling and material removal, so that the formed steel pipe 21 can be more easily removed from the material.

[0032] Referring to Figures 6-8, on both sides of the I-shaped perforation 1105, symmetric tapered roller bearings 1106 are clamped respectively, and a same rotating blanking ring 24 is rotatably inserted between the two tapered roller bearings 1106. An annular abutting plate is reserved on the side of the rotating blanking ring 24 close to the rolling system. On the outer circumferential wall of the other end of the rotating blanking ring 24, a driven worm gear ring 10 is sleeved and fixed. The inner circumferential wall of the rotating blanking ring 24 is larger than the outer diameter of the annular section 12, and there is a gap between the inner circumferential wall of the rotating blanking ring 24 and the ball 25. Thus, it can be ensured that the whole rotating blanking ring 24 can slide back and forth on the outer circumferential wall of the sizing rod 17, and then the formed steel pipe 21 sleeved on the outer wall of the sizing rod 17 after rolling can be smoothly unloaded.

[0033] Refer to Figures 5-6 , at the bottom end of the sliding push plate 11, a convex platform slider 1103 is welded and fixed, and the convex platform slider 1103 is slidably connected in the C-shaped sliding tube 2. The whole convex platform slider 1103 is of a cylindrical structure, and a through threaded hole is opened at the end of the convex platform slider 1103. A round hole for fixing the C-shaped sliding tube 2 is opened in the middle of the support column 301. On the side of the support column 301 far from the rolling system, a motor frame 6 is fixed, and a servo motor 7 is fixed at the top of the motor frame 6. The top end of the output shaft of the servo motor 7 is fixed with a transmission screw rod 26 through a coupling. The transmission screw rod 26 is screwed in the threaded hole in the middle of the convex platform slider 1103. By controlling the rotation of the transmission screw rod 26, the sliding push plate 11 and the convex platform slider 1103 can be driven to move back and forth on the C-shaped sliding tube 2, and then the blanking work can be completed.

[0034] Refer to Figures 4-6 , on the side of the sliding push plate 11 close to the driven worm gear ring 10 and near the lower part, a roller frame 1101 and a shaft rod frame 1102 are fixed respectively. A driving gear is rotatably connected in the roller frame 1101. A worm 1104 is rotatably connected in the shaft rod frame 1102, and the worm 1104 meshes with the driven worm gear ring 10. One end of the worm 1104 far from the driven worm gear ring 10 is fixed with a driven gear meshing with the driving gear. A rack 201 meshing with the driving gear is embedded at the opening near the top end of the outer wall of the C-shaped sliding tube 2. Due to the setting of the worm and worm gear mechanism linked with the sliding push plate 11, the rotating blanking ring 24 can be driven to rotate simultaneously during the blanking sliding, so that the formed steel pipe 21 is unloaded in a spiral manner when being unloaded, thereby reducing the probability of the inner wall of the formed steel pipe 21 being scratched and also reducing the discharging resistance.

[0035] Refer to Figure 1 、 Figure 8, a plurality of roller grooves are formed on the circumferential outer wall of the boss slider 1103, and rollers are arranged in each roller groove. The axis line of the roller is skew perpendicular to the axis line of the boss slider 1103, so as to reduce the resistance when the boss slider 1103 slides in the C-shaped slide tube 2. A plurality of leakage holes are formed at the bottom of the groove of the C-shaped slide tube 2, which can timely discharge the residues generated during rolling, such as scale and cooling water; a snap ring mounting seat 9 is fixed at the top of the first support column 301, and a rod pressing fixing part 8 is clamped and fixed in the middle of the snap ring mounting seat 9, which is used to tightly horizontally plug and fix the sizing rod 17 above the sliding bearing seat 3.

[0036] Refer to Figure 1 , Figure 8 , a hexagonal counterbore is formed at one end of the sizing rod 17 close to the rolling system, and a hexagonal prism is inserted in the hexagonal counterbore. A through-hole top block 18 is fixed at one end of the hexagonal prism away from the sizing rod 17. The outer diameter of the through-hole top block 18 is larger than the outer diameter of the annular section 12, ensuring that the inner wall of the formed steel pipe 21 only contacts the protruding balls 25 on the surface of the annular section 12.

[0037] Refer to Figures 1-3 , the rolling system includes a rolling roll frame 19 fixed above the frame seat 1. An inclined rolling roll 20 is arranged in the rolling roll frame 19. The through-hole top block 18 is located at the rolling center position of the middle two inclined rolling rolls 20.

[0038] Refer to Figures 3-4, on the lower surface of the sliding bearing seat 3, a first shaft column 302 and a strip-shaped shaft column 303 are respectively fixed near the middle of both ends, and the strip-shaped shaft column 303 is located at one end close to the rolling system. On the mounting base 4, a second strip hole 403 and an anti-twist strip hole 401 are provided for the first shaft column 302 and the strip-shaped shaft column 303 to pass through correspondingly. A sliding bearing seat 23 is arranged on the outer circumferential wall near the bottom end of the first shaft column 302 passing through the second strip hole 403. On both sides of the second strip hole 403 on the lower surface of the mounting base 4, symmetric angle steel slide rails 22 are respectively arranged. The sliding bearing seat 23 is slidably connected between the two angle steel slide rails 22. At one end of the lower surface of the mounting base 4 away from the frame seat 1, a hydraulic jack 5 is fixed, and the end of the extension rod of the hydraulic jack 5 is fixed to the side surface of the sliding bearing seat 23. When it is necessary to strip the formed steel pipe 21 after rolling, only need to control the contraction of the extension rod of the hydraulic jack 5 to pull out the sliding bearing seat 3 and the formed steel pipe 21 sleeved on the sizing abutting rod 17 above it as a whole from the rolling system. And a large gear is fixed to the bottom end of the first shaft column 302, a driving motor is fixed to the side of the sliding bearing seat 23 away from the hydraulic jack 5, and a small gear meshing with the large gear is fixed to the top end of the output shaft of the driving motor. On the side of the anti-twist strip hole 401 close to the second strip hole 403, a sector-shaped rotating hole 402 extending towards the front of the whole device is opened. The central angle of the sector-shaped rotating hole 402 is 15 - 30 degrees. On the upper surface of the mounting base 4 in front of the roll stand 19, a T-shaped guide wheel frame 16 is fixed, and a plurality of discharging guide wheels 15 are arranged on the T-shaped guide wheel frame 16. It is convenient to convey the stripped formed steel pipe 21 to an open space for the next step of auxiliary forming.

[0039] Refer to Figure 1 and Figure 2 , on the upper surface of the mounting base 4 near the rolling system, two electric push rods 13 are fixed, and the ends of the extension rods of the two electric push rods 13 are fixed to the same horizontal lifting support plate 14; to prevent the formed steel pipe 21 from being too heavy and bending the sizing abutting rod 17.

[0040] Working principle: After rolling, the formed steel pipe 21 will be sleeved on the circumferential outer wall of the sizing abutting rod 17, and the pipe orifice end of the formed steel pipe 21 is close to the annular abutting plate surface of the rotating unloading ring 24; at this time, control the extension rod of the hydraulic jack 5 to contract, so as to pull out the sliding bearing seat 3 and the formed steel pipe 21 sleeved on the sizing abutting rod 17 above it as a whole from the rolling system; then control the driving motor to start, and rotate the sliding bearing seat 3 and the formed steel pipe 21 to the upper central position facing the discharging guide wheel 15; then the servo motor 7 can be started. At this time, the transmission screw 26 starts to rotate, which can drive the sliding push plate 11 and the boss slider 1103 to push the steel pipe body 21 on the C-shaped sliding pipe 2 towards one end of the through center abutting block 18 until all the unloading work is completed; due to the setting of the worm and worm gear mechanism linked with the sliding push plate 11, the rotating unloading ring 24 will be driven to rotate simultaneously during the unloading sliding, so that the formed steel pipe 21 is unloaded in a spiral manner when being unloaded, thereby reducing the probability of the inner wall of the formed steel pipe 21 being scratched and also reducing the discharging resistance.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A hot rolling device for producing seamless steel pipes, comprising a frame base (1) fixed to the ground and a rolling system fixed above the frame base (1), wherein a mounting base (4) is fixed on the discharge side of the frame base (1), characterized in that: The upper surface of the mounting base (4) is slidably connected to a sliding bearing seat (3) of a long strip structure, and the sliding bearing seat (3) can rotate 15-30 degrees when sliding to the end away from the rolling system. A support column (301) is fixed to the end of the upper surface of the sliding bearing seat (3) away from the frame seat (1), and a C-shaped sliding tube (2) with an opening facing upward is fixed in the middle of the side of the support column (301) close to the rolling system. The C-shaped sliding tube (2) and the sliding bearing seat (3) are in the same direction as the rolling center line in the length direction, and a sliding push plate (11) is slidably connected in the C-shaped sliding tube (2), and the plate surface of the sliding push plate (11) is perpendicular to the rolling center line; a sizing rod (17) extending horizontally toward the rolling point is fixed to the top of the support column (301), and an I-shaped through hole (1105) is opened in the middle of the sliding push plate (11) for the sizing rod (17) to pass through.

2. A hot rolling device for producing seamless steel pipes according to claim 1, characterized in that: The circumferential outer wall of the sizing rod (17) is reserved with a plurality of equally spaced annular sections (12), the circumferential outer wall of the annular section (12) is provided with a plurality of spherical grooves, and balls (25) are embedded in the spherical grooves; the bottoms of the spherical grooves are provided with centripetal cylindrical grooves, and the bottoms of the cylindrical grooves are fixed with a clamping spring, and the clamping spring is arranged between the bottoms of the cylindrical grooves and the surfaces of the balls (25).

3. A hot rolling device for producing seamless steel pipes according to claim 1, characterized in that: The two sides of the I-shaped through hole (1105) are respectively clamped with mutually symmetrical tapered roller bearings (1106), and the same rotating stripping ring (24) is rotatably inserted between the two tapered roller bearings (1106). A ring-shaped abutment plate is reserved on the side of the rotating stripping ring (24) close to the rolling system. The other end of the rotating stripping ring (24) is sleeved and fixed with a driven worm gear ring (10). The inner circumferential wall of the rotating stripping ring (24) is larger than the outer diameter of the annular section (12), and a gap is left between the inner circumferential wall of the rotating stripping ring (24) and the ball (25).

4. A hot rolling device for producing seamless steel pipes according to claim 3, characterized in that: A boss slider (1103) is welded and fixed to the bottom end of the sliding push plate (11), and the boss slider (1103) is slidably connected in the C-shaped slide tube (2). The boss slider (1103) is an overall cylindrical structure, and a threaded hole is provided at the end of the boss slider (1103), and a circular hole for fixing the C-shaped slide tube (2) is provided in the middle of the support column 1 (301); a motor frame (6) is fixed to the side of the support column 1 (301) away from the rolling system, and a servo motor (7) is fixed to the top of the motor frame (6), and a transmission screw (26) is fixed to the top of the output shaft of the servo motor (7) through a coupling, and the transmission screw (26) is screwed into the threaded hole in the middle of the boss slider (1103).

5. A hot rolling device for producing seamless steel pipes according to claim 4, characterized in that: A roller frame (1101) and an axle frame (1102) are fixed to the lower side of the sliding push plate (11) close to the driven worm wheel ring (10), and a driving gear is rotatably connected in the roller frame (1101); a worm (1104) is rotatably connected in the axle frame (1102), and the worm (1104) and the driven worm wheel ring (10) are meshed with each other, and a driven gear meshed with the driving gear is fixed to the end of the worm (1104) away from the driven worm wheel ring (10); a rack (201) meshed with the driving gear is embedded in the outer wall of the C-shaped sliding tube (2) close to the top opening.

6. A hot rolling device for producing seamless steel pipes according to claim 4, characterized in that: The circumferential outer wall of the boss slider (1103) is provided with a plurality of roller grooves, and rollers are arranged in the roller grooves, the axis of the rollers is skewed and perpendicular to the axis of the boss slider (1103), and the groove bottom of the C-shaped slide tube (2) is provided with a plurality of leakage holes; the top end of the support column 1 (301) is fixed with a clamping ring mounting seat (9), and the middle of the clamping ring mounting seat (9) is clamped and fixed with a rod fixing member (8).

7. A hot rolling device for producing seamless steel pipes according to claim 2, characterized in that: The end of the sizing rod (17) close to the rolling system is provided with a hexagonal groove, and a hexagonal prism is inserted into the hexagonal groove. The end of the hexagonal prism away from the sizing rod (17) is fixed with a through-hole block (18), and the outer diameter of the through-hole block (18) is greater than the outer diameter of the annular section (12).

8. A hot rolling device for producing seamless steel pipes according to claim 7, characterized in that: The rolling system comprises a roller frame (19) fixed above a frame seat (1), wherein the roller frame (19) is provided with oblique rollers (20), and the through-hole top block (18) is located at the rolling center position of the two middle oblique rollers (20).

9. A hot rolling device for producing seamless steel pipes according to claim 8, characterized in that: A shaft column (302) and a strip shaft column (303) are fixed to the lower surface of the sliding bearing seat (3) near the middle of both ends, and the strip shaft column (303) is located at one end close to the rolling system. The mounting base (4) is provided with a secondary strip hole (403) and an anti-twist strip hole (401) for the shaft column (302) and the strip shaft column (303) to pass through respectively; the shaft column (302) passes through the secondary strip hole (403) and is provided with a sliding bearing seat (23) near the outer wall of the bottom circumference, and the lower surface of the mounting base (4) is located on both sides of the secondary strip hole (403) and is provided with symmetrical angle steel slide rails (22) respectively, the sliding bearing seat (23) is slidably connected between the two angle steel slide rails (22), and the lower surface of the mounting base (4) is away from the frame seat (1). A hydraulic push rod (5) is fixed to one end of the shaft column (302), and the end of the extension rod of the hydraulic push rod (5) is fixed to the side of the sliding bearing seat (23); a large gear is fixed to the bottom end of the shaft column (302); a driving motor is fixed to the side of the sliding bearing seat (23) away from the hydraulic push rod (5), and a small gear meshing with the large gear is fixed to the top of the output shaft of the driving motor; a fan-shaped rotating hole (402) extending toward the front of the overall device is formed on the side of one end of the anti-twist strip hole (401) close to the secondary strip hole (403); the central angle of the fan-shaped rotating hole (402) is 15-30 degrees, and a T-shaped guide wheel frame (16) is fixed to the upper surface of the mounting base (4) located on the front of the roller frame (19), and a plurality of discharge guide wheels (15) are arranged on the T-shaped guide wheel frame (16).

10. A hot rolling device for producing seamless steel pipes according to claim 1, characterized in that: Two electric push rods (13) are fixed to one end of the upper surface of the mounting base (4) close to the rolling system, and the ends of the extension rods of the two electric push rods (13) are fixed with lifting and lowering plates (14) at the same level.

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