A seamless steel pipe hot rolling sizing device

Abstract

The present invention relates to the technical field of seamless steel pipe production, and particularly to a hot rolling sizing device for seamless steel pipes. The hot rolling sizing device for seamless steel pipes includes a frame. Support frames are welded at both ends of the frame. A plurality of support rods are installed on the two support frames. An end plate is welded on one of the support frames. A central rod is installed on the end plate. A sliding ring is slidably installed on the support rod. A first driving member is installed on the sliding ring. An internal gear is rotatably installed on the sliding ring, and a servo motor for driving the internal gear to rotate is provided. A first transmission gear is sleeved on the output shaft of the servo motor. The first transmission gear meshes with the internal gear, and a plurality of sizing assemblies are installed on the internal gear. An internal support mechanism is slidably installed on the central rod. The internal support mechanism includes a first sliding disk, a second sliding disk, a lead screw, a support plate, a support wheel and an adjustment disk. A second driving member for driving the internal support mechanism to move is installed on the central rod. The hot rolling sizing device for seamless steel pipes provided by the present invention has the advantages of high sizing accuracy and small error.

Description

Technical Field

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

[0002] A steel pipe made of a single piece of metal without seams on its surface is called a seamless steel pipe. According to the production method, seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, pipe jacking pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into two types: circular and special-shaped. Special-shaped pipes have various complex shapes such as square, oval, triangular, hexagonal, sunflower-shaped, star-shaped, and finned pipes. The maximum diameter reaches 650 mm, and the minimum diameter is 0.3 mm. According to different uses, there are thick-walled pipes and thin-walled pipes. Seamless steel pipes are mainly used as oil geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

[0003] For the standardization of connections, multiple sizing processing procedures are required for the rolled seamless steel pipes to make their inner and outer diameters reach the standard. However, in the existing sizing machines, after the seamless steel pipe is opened and removed from the pipe, only external pressure sizing is performed on the steel pipe during the subsequent sizing process. For example, a sizing device for hot-rolling seamless steel pipes disclosed in the publication number CN216420682U includes a bracket, and a positioning frame is fixedly installed on the upper end surface of the bracket. A chute is opened on the inner side wall of the positioning frame, and a clamping mechanism is detachably installed inside the positioning frame. Four clamping mechanisms are symmetrically arranged. In the present invention, by changing the depth of the adjusting rod inside the positioning frame, the depths of the pressing plate, the support column, and the clamping pad can be changed, so as to meet the sizing requirements of different depths. During the movement of the pressing plate, the support column, and the clamping pad, the cooperation of the pulley and the chute can ensure the smooth movement of the clamping mechanism without displacement, with strong practicability. And by setting the fixing piece, the stability of the adjusting rod can be ensured, and by implementing the limiting piece, the movement of the adjusting rod can be limited to prevent it from falling off easily, with good working performance.

[0004] However, during its use, only the outer side wall of the seamless steel pipe is pressure-sized. During multiple pressure sizing processes, due to the accumulated deformation caused by the pressure, the inner diameter of the seamless steel pipe will be reduced in diameter, thus affecting the diameter accuracy of the seamless steel pipe and resulting in large sizing processing errors.

[0005] Therefore, it is necessary to provide a new hot rolling sizing device for seamless steel pipes to solve the above technical problems. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a hot rolling sizing device for seamless steel pipes with high sizing accuracy and small errors.

[0007] The seamless steel pipe hot rolling sizing device provided by the present invention includes: a frame, support frames are welded at both ends of the frame, a plurality of support rods are installed on the two support frames, and an end plate is welded on one of the support frames; a central rod is installed on the end plate;

[0008] A sliding ring is slidably installed on the plurality of support rods, and a first driving member for driving the sliding ring to slide along the support rods is installed on the sliding ring. An internal gear is rotatably installed on the sliding ring, and a servo motor for driving the internal gear to rotate is provided. A first transmission gear is sleeved on the output shaft of the servo motor, the first transmission gear meshes with the internal gear, and a plurality of sizing assemblies are installed on the internal gear;

[0009] An inner support mechanism is slidably installed on the central rod, and the inner support mechanism includes a first sliding disk, a second sliding disk, a lead screw, a support plate, a support wheel and an adjustment disk. Both the first sliding disk and the second sliding disk are slidably installed on the central rod, and the first sliding disk and the second sliding disk are connected into one body by the lead screw, and the lead screw is rotatably connected to both the first sliding disk and the second sliding disk. A plurality of support plates are evenly hinged on the first sliding disk, support wheels are symmetrically installed at one end of the support plate close to the second sliding disk, the adjustment disk is threadedly installed on the lead screw, and a convex block slidably connected to the support plate is welded on the outer side wall of the adjustment disk (86). A limiting groove slidably matched with the convex block is opened on the support plate, and a second driving member for driving the inner support mechanism to move is installed on the central rod.

[0010] Preferably, hydraulic rods are symmetrically installed on the other support frame of the frame, stable blocks are fixedly installed at the telescopic ends of the hydraulic rods, and arc-shaped grooves fitting the outer side wall of the central rod are opened on the stable blocks.

[0011] Preferably, the sliding ring is formed by fixing two semi-circular rings into one body by bolts, and grooves slidably matched with the outer side wall of the internal gear are opened on the rings.

[0012] Preferably, there are two groups of the first driving members, and the two groups of the first driving members are symmetrically distributed based on the sliding ring. The first driving member includes a rack plate, a connecting plate and a first driving motor. The rack plate is fixedly installed on the frame and is located below the sliding ring. The connecting plate is welded on the outer side wall of the sliding ring, and a first driving motor is fixedly installed on the connecting plate. A second transmission gear is sleeved on the output shaft of the first driving motor, and the second transmission gear meshes with the rack plate.

[0013] Preferably, the multiple groups of sizing assemblies are circumferentially distributed based on the axis of the internal gear.

[0014] Preferably, the sizing component includes a seesaw, an electric telescopic rod, a connecting frame, and rolling wheels. The seesaw is fixedly installed on both sides of the internal gear through bolts, and electric telescopic rods are fixedly installed on both of the seesaws. The telescopic ends of the two electric telescopic rods are jointly fixedly installed with a connecting frame, and rolling wheels are symmetrically installed on the connecting frame.

[0015] Preferably, the internal support mechanism further includes an adjustment sleeve. The adjustment sleeve is rotatably installed on the second sliding disk, and an internal gear ring is installed on the inner side wall of one end of the adjustment sleeve extending out of the second sliding disk. A third transmission gear is sleeved on one end of the lead screw close to the adjustment sleeve, and the third transmission gear meshes with the internal gear ring.

[0016] Preferably, there are two lead screws, and the two lead screws are symmetrically distributed based on the axis of the second sliding disk.

[0017] Preferably, the second driving member includes a screw rod, a second driving motor, and a transmission plate. The screw rod is rotatably installed in the through groove opened in the central rod, and the second driving motor for driving the screw rod to rotate is fixedly installed on the end plate. The two transmission plates are both threadedly installed on the screw rod, and the two transmission plates are respectively fixedly connected to the first sliding disk and the second sliding disk through bolts.

[0018] Preferably, the transmission plate is slidably matched with the through groove.

[0019] Compared with the related art, the seamless steel pipe hot rolling sizing device provided by the present invention has the following beneficial effects:

[0020] 1. The present invention provides a seamless steel pipe hot rolling sizing device. By arranging an internal support mechanism on the central rod, through the cooperation of the first sliding disk, the second sliding disk, the lead screw, the third transmission gear, the support plate, the limiting groove, the support wheel, the adjustment disk, the convex block, the adjustment sleeve, the internal gear ring, and the second driving member, when the sizing component extrudes the outer side wall of the seamless steel pipe, the inner side wall can be sized synchronously, so that the sizing accuracy is higher and the error is small.

[0021] 2. The outer diameter component can size seamless steel pipes of different sizes through the cooperation of the seesaw, the electric telescopic rod, the connecting frame, and the rolling wheels, and through the cooperation of the sliding ring, the internal gear, and the first driving member, continuous rolling extrusion sizing can be performed on the seamless steel pipe, so that the sizing of its outer side wall is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a preferred embodiment of the seamless steel pipe hot rolling sizing device provided by the present invention;

[0023] Figure 2 is a schematic structural diagram of another perspective of the seamless steel pipe hot rolling sizing device provided by the present invention;

[0024] Figure 3 is Figure 1 a schematic structural diagram of the frame shown;

[0025] Figure 4 is Figure 2 an exploded structural diagram of the sliding ring shown;

[0026] Figure 5 is Figure 1 an exploded structural diagram of the sizing assembly shown;

[0027] Figure 6 is Figure 2 a schematic structural diagram of the second driving member with an inner support mechanism installed as shown;

[0028] Figure 7 is Figure 6 a schematic structural diagram of the inner support mechanism shown.

[0029] Reference numerals in the figure: 1, frame; 11, support frame; 12, support rod; 13, end plate; 14, hydraulic rod; 15, stabilizing block; 2, central rod; 201, through groove; 3, sliding ring; 31, ring; 301, groove; 4, first driving member; 41, rack plate; 42, connecting plate; 43, driving motor 1; 431, transmission gear 2; 5, internal gear; 6, servo motor; 61, transmission gear 1; 7, sizing assembly; 71, rocker; 72, electric telescopic rod; 73, connecting frame; 74, rolling wheel; 8, inner support mechanism; 81, sliding disk 1; 82, sliding disk 2; 83, lead screw; 831, transmission gear 3; 84, support plate; 841, limit groove; 85, support wheel; 86, adjusting disk; 861, convex block; 87, adjusting sleeve; 871, internal gear ring; 9, second driving member; 91, screw; 92, driving motor 2; 93, transmission plate. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0032] Please refer to Figures 1 to 7 , a seamless steel pipe hot rolling sizing device provided by an embodiment of the present invention, the seamless steel pipe hot rolling sizing device includes: a frame 1, a central rod 2, a sliding ring 3, a first driving member 4, an internal gear 5, a servo motor 6, a sizing assembly 7, an inner support mechanism 8 and a second driving member 9.

[0033] Both ends of the frame 1 are welded with support frames 11. A plurality of support rods 12 are installed on the two support frames 11. One of the support frames 11 is welded with an end plate 13; a center rod 2 is installed on the end plate 13;

[0034] A sliding ring 3 is slidably installed on the plurality of support rods 12. A first driving member 4 for driving the sliding ring 3 to slide along the support rods 12 is installed on the sliding ring 3. An internal gear 5 is rotatably installed on the sliding ring 3, and a servo motor 6 for driving the internal gear 5 to rotate is provided. A first transmission gear 61 is sleeved on the output shaft of the servo motor 6. The first transmission gear 61 meshes with the internal gear 5, and a plurality of sizing components 7 are installed on the internal gear 5;

[0035] An inner support mechanism 8 is slidably installed on the center rod 2. The inner support mechanism 8 includes a first sliding disk 81, a second sliding disk 82, a lead screw 83, a support plate 84, a support wheel 85 and an adjustment disk 86. The first sliding disk 81 and the second sliding disk 82 are both slidably installed on the center rod 2, and the first sliding disk 81 and the second sliding disk 82 are connected into one body through the lead screw 83. The lead screw 83 is rotatably connected to both the first sliding disk 81 and the second sliding disk 82. A plurality of support plates 84 are evenly hinged on the first sliding disk 81. Support wheels 85 are symmetrically installed at one end of the support plate 84 close to the second sliding disk 82. The adjustment disk 86 is threadedly installed on the lead screw 83, and a convex block 861 slidably connected to the support plate 84 is welded on the outer side wall of the adjustment disk 86. A limiting groove 841 slidably matched with the convex block 861 is formed on the support plate 84. A second driving member 9 for driving the inner support mechanism 8 to move is installed on the center rod 2.

[0036] Wherein, the inner support mechanism 8 further includes an adjustment sleeve 87. The adjustment sleeve 87 is rotatably installed on the second sliding disk 82, and an internal gear ring 871 is installed on the inner side wall of one end of the adjustment sleeve 87 extending out of the second sliding disk 82. A third transmission gear 831 is sleeved on one end of the lead screw 83 close to the adjustment sleeve 87. The third transmission gear 831 meshes with the internal gear ring 871.

[0037] It should be noted that during use, the seamless steel pipe after pipe removal is conveyed onto the central rod 2. Then, the first driving member 4 is used to drive the sliding ring 3 to the end of the seamless steel pipe away from the end plate 13. Then, the sizing assembly 7 is adjusted to a size that meets the outer diameter requirements of the seamless steel pipe. Then, the inner support mechanism 8 is adjusted to a size that meets the inner diameter requirements of the seamless steel pipe. When the inner support mechanism 8 is in use, by rotating the adjusting sleeve 87, the adjusting sleeve 87 meshes with the third transmission gear 831 through the internal gear ring 871, thereby driving the lead screw 83 to rotate. The lead screw 83 drives the adjusting disc 86 to approach the first sliding disc 81. During the movement, the adjusting disc 86 slides through the convex block 861 in the limiting groove 841, thereby driving the support plate 84 to rotate upward while approaching the first sliding disc 81 until the support wheel 85 at the front end of the support plate 84 contacts the inner wall of the seamless steel pipe and is adjusted to the specified inner diameter size. After the adjustment, the first driving member 4 and the second driving member 9 are simultaneously started, and the control servo motor 6 drives the internal gear 5 to rotate through the first transmission gear 61. Thus, while the internal gear 5 drives multiple sizing assemblies 7 to extrude and size the outer sidewall of the seamless steel pipe, the support wheel 85 of the inner support mechanism 8 is controlled to move synchronously to size its inner diameter, thereby reducing the diameter reduction of the seamless steel pipe and improving the sizing accuracy.

[0038] In this embodiment: There are two lead screws 83, and the two lead screws 83 are symmetrically distributed based on the axis of the second sliding disc 82. In this way, when the lead screw 83 drives the adjusting disc 86 to move, the two lead screws 83 are used to restrict the adjusting disc 86 from rotating following a single lead screw 83. Thus, when the lead screw 83 rotates, it drives the adjusting disc 86 to move along the direction of the lead screw 83 and makes its movement more stable.

[0039] In an embodiment of the present invention, please refer to Figure 1 and Figure 2 , on another support frame 11 of the frame 1, hydraulic rods 14 are symmetrically installed. The telescopic ends of the hydraulic rods 14 are fixedly installed with stabilizing blocks 15, and the stabilizing blocks 15 are provided with arc-shaped grooves that fit the outer sidewall of the central rod 2.

[0040] It should be noted that: After the seamless steel pipe is inserted onto the central rod 2, the two hydraulic rods 14 are started so that the stabilizing blocks 15 at their telescopic ends contact and wrap and support the central rod 2, thereby cooperating with the end plate 13 to play a common supporting role for the central rod 2, and thus realizing the stable support of the central rod 2 for the inner support mechanism 8.

[0041] In an embodiment of the present invention, please refer to Figure 1 and Figure 4 , the sliding ring 3 is formed by fixing two semi-circular rings 31 of a split structure together by bolts, and the ring 31 is provided with a groove 301 that slidably cooperates with the outer sidewall of the internal gear 5.

[0042] It should be noted that: in this way, the inner gear 5 is wrapped by the groove 301 opened in the circular ring 31 of the two semi-closed mechanisms, so as to realize the rotational installation of the inner gear 5 in the sliding ring 3.

[0043] In an embodiment of the present invention, please refer to Figure 1 and Figure 4 , there are two sets of first driving members 4, and the two sets of first driving members 4 are symmetrically distributed based on the sliding ring 3. The first driving member 4 includes a rack plate 41, a connecting plate 42 and a first driving motor 43. The rack plate 41 is fixedly installed on the frame 1 and is located below the sliding ring 3. The connecting plate 42 is welded to the outer side wall of the sliding ring 3, and a first driving motor 43 is fixedly installed on the connecting plate 42. A transmission gear two 431 is sleeved on the output shaft of the first driving motor 43, and the transmission gear two 431 meshes with the rack plate 41.

[0044] It should be noted that: when the first driving member 4 is used, by controlling the rotation of the first driving motor 43, the first driving motor 43 drives the transmission gear two 431 to rotate. The transmission gear two 431 meshes with the rack plate 41, so as to drive the sliding ring 3 to slide along the support rod 12. Two sets of first driving members 4 are symmetrically arranged, which can increase the sliding power and avoid excessive resistance and insufficient driving force when the sizing assembly 7 extrudes the seamless steel pipe.

[0045] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 5 , multiple sets of sizing assemblies 7 are circumferentially distributed based on the axis of the inner gear 5;

[0046] The sizing assembly 7 includes a seesaw 71, an electric telescopic rod 72, a connecting frame 73 and a rolling wheel 74. The seesaw 71 is fixedly installed on both sides of the inner gear 5 by bolts, and electric telescopic rods 72 are fixedly installed on both seesaws 71. The telescopic ends of the two electric telescopic rods 72 are jointly fixedly installed with a connecting frame 73, and rolling wheels 74 are symmetrically installed on the connecting frame 73.

[0047] It should be noted that: when the sizing assembly 7 is used, by controlling the telescopic movement of the electric telescopic rod 72, the height of the connecting frame 73 is adjusted, and then the height of the rolling wheel 74 is adjusted, so as to facilitate the extrusion and sizing of seamless steel pipes with different outer diameters.

[0048] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 5, the second driving member 9 includes a screw rod 91, a second driving motor 92 and a transmission plate 93. The screw rod 91 is rotatably installed in a through groove 201 formed in the central rod 2. The second driving motor 92 for driving the screw rod 91 to rotate is fixedly installed on the end plate 13. Two transmission plates 93 are both threadedly installed on the screw rod 91, and the two transmission plates 93 are respectively fixedly connected to the first sliding disk 81 and the second sliding disk 82 through bolts.

[0049] It should be noted that when the second driving member 9 is in use, by controlling the rotation of the second driving motor 92, the second driving motor 92 drives the screw rod 91 to rotate. The screw rod 91 drives the transmission plate 93 to rotate along the screw rod 91, thereby driving the entire inner support mechanism 8 to slide synchronously with the sliding ring 3, so as to perform synchronous sizing on the inner and outer diameters of the seamless steel pipe.

[0050] In this embodiment: the transmission plate 93 is in sliding fit with the through groove 201. In this way, the rotation of the transmission plate 93 following the screw rod 91 is restricted by the through groove 201, and the rotation of the screw rod 91 drives the transmission plate 93 to move along the screw rod 91.

[0051] The working principle of the seamless steel pipe hot rolling sizing device provided by the present invention is as follows:

[0052] During use, the seamless steel pipe after pipe removal is conveyed onto the central rod 2. Start the two hydraulic rods 14 so that the stabilizing blocks 15 at their telescopic ends come into contact and wrap around and support the central rod 2, thereby cooperating with the end plate 13 to jointly support the central rod 2. Then control the telescopic movement of the electric telescopic rod 72, thereby adjusting the height of the connecting frame 73, and thus adjusting the height of the rolling wheel 74 to make it fit on the outer side wall of the seamless steel pipe. Then, by rotating the adjusting sleeve 87, the adjusting sleeve 87 meshes with the third transmission gear 831 through the internal gear ring 871, thereby driving the lead screw 83 to rotate. The lead screw 83 drives the adjusting disc 86 to approach the first sliding disc 81. During the movement, the adjusting disc 86 slides through the convex block 861 in the limiting groove 841, thereby driving the support plate 84 to rotate upward while approaching the first sliding disc 81 until the support wheel 85 at the front end of the support plate 84 contacts the inner wall of the seamless steel pipe and adjusts it to the specified inner diameter size. After the adjustment, start the first driving motor 43 and the second driving motor 92 simultaneously. The first driving motor 43 drives the second transmission gear 431 to rotate. The second transmission gear 431 meshes with the rack plate 41, thereby driving the sliding ring 3 to slide along the support rod 12 to perform extrusion sizing on its outer diameter. During the sizing, start the servo motor 6 simultaneously. The servo motor 6 drives the internal gear 5 to rotate through the first transmission gear 61, so that the internal gear 5 drives multiple sizing assemblies 7 to perform rotational extrusion sizing on the outer side wall of the seamless steel pipe. During the movement, by controlling the rotation of the second driving motor 92, the second driving motor 92 drives the screw rod 91 to rotate. The screw rod 91 drives the transmission plate 93 to rotate along the screw rod 91, thereby driving the entire inner support mechanism 8 to slide synchronously with the sliding ring 3, so as to perform synchronous sizing on the inner and outer diameters of the seamless steel pipe, thereby improving the overall sizing accuracy.

[0053] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A seamless steel pipe hot rolling sizing device, comprising: A frame (1), both ends of the frame (1) are welded with support frames (11), a plurality of support rods (12) are installed on the two support frames (11), and an end plate (13) is welded on one of the support frames (11); A central rod (2) is installed on the end plate (13); It is characterized in that it further comprises: A sliding ring (3), slidably installed on the plurality of support rods (12), and a first driving member (4) for driving the sliding ring (3) to slide along the support rod (12) is installed on the sliding ring (3), an internal gear (5) is rotatably installed on the sliding ring (3), and a servo motor (6) for driving the internal gear (5) to rotate is provided. A transmission gear one (61) is sleeved on the output shaft of the servo motor (6), the transmission gear one (61) meshes with the internal gear (5), and multiple groups of sizing components (7) are installed on the internal gear (5); An inner support mechanism (8), slidably installed on the central rod (2), and the inner support mechanism (8) includes a first sliding disk (81), a second sliding disk (82), a lead screw (83), a support plate (84), a support wheel (85) and an adjusting disk (86). The first sliding disk (81) and the second sliding disk (82) are both slidably installed on the central rod (2), and the first sliding disk (81) and the second sliding disk (82) are connected into one body by a lead screw (83), and the lead screw (83) is rotatably connected to both the first sliding disk (81) and the second sliding disk (82). A plurality of support plates (84) are evenly hinged on the first sliding disk (81), and support wheels (85) are symmetrically installed at one end of the support plate (84) close to the second sliding disk (82). The adjusting disk (86) is threadedly installed on the lead screw (83), and a convex block (861) slidably connected to the support plate (84) is welded on the outer side wall of the adjusting disk (86). A limiting groove (841) slidably matched with the convex block (861) is opened on the support plate (84), and a second driving member (9) for driving the inner support mechanism (8) to move is installed on the central rod (2).

2. The seamless steel pipe hot rolling sizing device according to claim 1, wherein, Hydraulic rods (14) are symmetrically installed on another support frame (11) on the frame (1), and stabilizing blocks (15) are fixedly installed at the telescopic ends of the hydraulic rods (14). The stabilizing blocks (15) are provided with arc-shaped grooves that fit the outer side wall of the central rod (2).

3. The seamless steel pipe hot rolling sizing device according to claim 1, characterized in that, The sliding ring (3) is formed by fixing two semi-circular rings (31) into one body by bolts, and the ring (31) is provided with a groove (301) slidably matched with the outer side wall of the internal gear (5).

4. The seamless steel pipe hot rolling sizing device according to claim 1, characterized in that, There are two sets of the first driving members (4), and the two sets of the first driving members (4) are symmetrically distributed based on the sliding ring (3). The first driving member (4) includes a rack plate (41), a connecting plate (42) and a first driving motor (43). The rack plate (41) is fixedly installed on the frame (1) and is located below the sliding ring (3). The connecting plate (42) is welded to the outer side wall of the sliding ring (3), and the first driving motor (43) is fixedly installed on the connecting plate (42). A second transmission gear (431) is sleeved on the output shaft of the first driving motor (43), and the second transmission gear (431) meshes with the rack plate (41).

5. The seamless steel pipe hot rolling sizing device according to claim 1, characterized in that, Multiple sets of the sizing components (7) are circumferentially distributed based on the axis of the internal gear (5).

6. The seamless steel pipe hot rolling sizing device according to claim 5, characterized in that, The sizing component (7) includes a seesaw (71), an electric telescopic rod (72), a connecting frame (73) and a rolling wheel (74). The seesaw (71) is fixedly installed on both sides of the internal gear (5) by bolts, and the electric telescopic rods (72) are fixedly installed on the two seesaws (71). The telescopic ends of the two electric telescopic rods (72) are jointly fixedly installed with the connecting frame (73), and the rolling wheels (74) are symmetrically installed on the connecting frame (73).

7. The seamless steel pipe hot rolling sizing device according to claim 1, characterized in that, The inner support mechanism (8) further includes an adjusting sleeve (87). The adjusting sleeve (87) is rotatably installed on the second sliding disk (82), and an internal gear ring (871) is installed on the inner side wall of one end of the adjusting sleeve (87) extending out of the second sliding disk (82). A third transmission gear (831) is sleeved on one end of the lead screw (83) close to the adjusting sleeve (87), and the third transmission gear (831) meshes with the internal gear ring (871).

8. The seamless steel pipe hot rolling sizing device according to claim 7, characterized in that, There are two lead screws (83), and the two lead screws (83) are symmetrically distributed based on the axis of the second sliding disk (82).

9. The seamless steel pipe hot rolling sizing device according to claim 1, characterized in that, The second driving member (9) includes a screw rod (91), a second driving motor (92) and a transmission plate (93). The screw rod (91) is rotatably installed in a through groove (201) opened in the central rod (2). The second driving motor (92) for driving the screw rod (91) to rotate is fixedly installed on the end plate (13). The two transmission plates (93) are threadedly installed on the screw rod (91), and the two transmission plates (93) are respectively fixedly connected to the first sliding disk (81) and the second sliding disk (82) by bolts.

10. The seamless steel pipe hot rolling sizing device according to claim 9, characterized in that, The transmission plate (93) is in sliding fit with the through groove (201).

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