A hot-rolled centering and spreading mechanism for wheels

Abstract

This invention discloses a synchronous centering mechanism for a wheel rolling mill, belonging to the technical field of steel wheel rolling mills. It includes a main roll assembly that is slidably disposed in a mounting groove in the machine body in the left-right direction and a centering roll assembly that is symmetrically disposed relative to the main roll assembly in the up-down direction. Both centering roll assemblies are hinged to the machine body. A driving part is provided on the main roll assembly. The driving part is used to drive the left ends of the two centering roll assemblies to rotate simultaneously when the main roll assembly moves to the right, thereby causing the right ends of the two centering roll assemblies and the right end of the main roll assembly to move inward synchronously. In use, this invention places the wheel between the right ends of the two centering roller assemblies and the right end of the main roller assembly using a robotic arm. Then, the main roller assembly is driven to move to the right by the main hydraulic telescopic rod, so that the right ends of the main roller assembly and the two centering roller assemblies move inward synchronously to clamp the wheel tread. Then, the spoke roller assembly rubs against the inner edge of the wheel to drive the wheel to rotate. At the same time, the contact point between the spoke roller assembly and the inner edge of the wheel generates a backward force, which has a spoke-expanding effect on the inner edge of the wheel. This also increases the contact force between the wheel tread and the main roller, ensuring the smoothness of the wheel rotation.

Description

Technical Field

[0001] This invention belongs to the field of steel wheel rolling mill technology, and particularly relates to a hot rolling centering and spreading mechanism for wheels. Background Technology

[0002] Currently, wheel rolling mills are a type of equipment used to manufacture railway train wheels. In wheel manufacturing, the heated billet is first initially pressed into shape using a press, then the spokes are expanded and the rim and tread are rolled out on the wheel rolling mill, and finally the wheel is precisely machined on a lathe.

[0003] Existing hot rolling mills for steel wheels generally include main rolls, upper centering rolls, lower centering rolls, side rolls, guide rolls, and spoke rolls. In operation, a robotic arm places the freshly forged wheel into a designated position. The main rolls, upper centering rolls, and lower centering rolls then close to clamp the wheel's tread surface. The side rolls and guide rolls clamp the wheel's sides. The truncated cone surface of the spoke rolls contacts the inner edge of the wheel's spokes, and the spoke rolls rotate, driving the wheel to rotate through friction. Currently, the main rolls, upper centering rolls, and lower centering rolls are driven independently. Because the wheel is circular, a control system is needed to control the individual drive mechanisms of the main rolls, upper centering rolls, and lower centering rolls to clamp the wheel. It is essential to ensure that the circumferential surfaces of the main rolls, upper centering rolls, and lower centering rolls are all externally tangent to a virtual circle to guarantee effective wheel clamping.

[0004] In the above scheme, the spoke roller drives the wheel to rotate through friction. Since the wheel tread is slightly irregularly circular during hot rolling, the irregular depressions on the wheel tread do not contact the main roll, upper centering roll, or lower centering roll, resulting in unstable rotation of the wheel during hot rolling, which can easily cause safety accidents. At the same time, three independent power units are required to drive the main roll, upper centering roll, and lower centering roll respectively, which increases energy consumption and increases the manufacturing and operating costs of the equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a hot rolling centering and spreading mechanism for wheels, which has the advantage of having a single power unit to simultaneously drive the main roll, upper centering roll, and lower centering roll to close and open, and also has the advantage of maintaining stable wheel rotation. This effectively solves the problems of high energy consumption and unstable wheel rotation in the existing hot rolling mill.

[0006] This invention adopts the following technical solution: a hot rolling centering and expanding mechanism for wheels, comprising a main roll assembly slidably disposed in a mounting groove of the machine body in the left-right direction and a centering roll assembly symmetrically disposed relative to the main roll assembly in the up-down direction, both centering roll assemblies being hinged to the machine body; a driving unit is provided on the main roll assembly, the driving unit being used to simultaneously drive the left ends of the two centering roll assemblies to rotate when the main roll assembly moves to the right, thereby causing the right ends of the two centering roll assemblies and the right end of the main roll assembly to move inward synchronously, and during this process... At any position, the right ends of the two centering roller assemblies and the right end of the main roll assembly are always tangent to the circumferential surface of the corresponding virtual circle, and the inscribed circles of the right ends of the two centering roller assemblies and the right ends of the main roll assembly are always concentric; the left end of the main roll assembly is provided with a main hydraulic telescopic rod, which is used to drive the main roll assembly to move left and right; two spoke roller assemblies are provided in the machine body, which are used to drive the wheel to rotate by rubbing against the inner edge of the wheel, and at the same time, the position where the spoke roller assembly contacts the inner edge of the wheel generates a backward force.

[0007] Furthermore, the centering roller assembly includes a hinged arm and a centering roller rotatably connected to the right end of the hinged arm, with the middle section of the hinged arm hinged to the machine body; the main roll assembly includes a drive rod and a main roll rotatably connected to the right end of the drive rod, with the left end of the drive rod fixedly connected to the output end of the main hydraulic telescopic rod, the drive rod located in the mounting groove of the machine body and slidingly connected to the machine body in the left-right direction, the drive unit including a drive block fixedly mounted on the drive rod, with cam surfaces provided on the upper and lower parts of the right side of the drive block, and a follower mechanism provided on the hinged arm, the follower mechanism being used to keep the left end of the hinged arm in contact with the cam surface when the drive block moves left and right.

[0008] Furthermore, the follower mechanism includes two follower plates, each with its left end hinged to the machine body, an arc-shaped hole in the middle of each follower plate along the left-right direction, and an adaptation hole in the right side of each follower plate; a main pin is fixedly installed on the front side of each drive block in the corresponding arc-shaped hole, and a secondary pin is fixedly installed on the left side of the front side of each hinge arm in the corresponding adaptation hole.

[0009] Furthermore, a first compensation mechanism is provided between the articulated arm and the centering roller; a second compensation mechanism is provided between the drive rod and the main roll; the first compensation mechanism is used to drive the centering roller to move inward to contact the tread surface of the wheel when the centering roller is not in contact with the tread surface of the wheel during wheel clamping; the second compensation mechanism is used to drive the main roll to move inward to contact the tread surface of the wheel when the main roll is not in contact with the tread surface of the wheel during wheel clamping.

[0010] Furthermore, the first compensation mechanism includes a housing fixedly disposed at the right end of the hinge arm, a centering roller rotatably connected inside the mounting block, a guide rod fixedly disposed on the upper end face of the mounting block, the guide rod passing through the housing in the vertical direction; a base plate fixedly disposed on the guide rod located inside the housing, a first compensation spring sleeved on the guide rod located inside the housing, the bottom end of the first compensation spring being fixedly disposed with the base plate, and a limit ring fixedly disposed inside the housing above the base plate.

[0011] Furthermore, the main roll is rotatably connected within two clamping plates, and the drive rod is slidably disposed within the two clamping plates in the left-right direction. The second compensation mechanism includes sliders slidably disposed on both the upper and lower end faces of the drive rod in the left-right direction. Each slider is fixedly disposed with each clamping plate. A second compensation spring is fixedly disposed between the drive block and each slider. Limit blocks are fixedly disposed on both the upper and lower end faces of the drive rod. Through holes are opened on the limit blocks, and the second compensation spring passes through the through holes of the limit blocks.

[0012] Furthermore, the front and rear sides of the machine body are provided with receiving holes, and the spoke roller assembly is located in the corresponding receiving holes; the spoke roller assembly includes a cylinder, and a rotating shaft is rotatably connected inside the cylinder. A spoke roller is provided at the left end of the rotating shaft, and a main shaft is fixedly provided at the right end of the rotating shaft. The main shaft is connected to the output end of the motor through a gearbox. A first bearing seat and a second bearing seat are fixedly provided at the left and right ends of the cylinder, respectively. The rotating shaft is rotatably connected to the first bearing seat and the second bearing seat through roller bearings, respectively. The outer surface of the first bearing seat is hinged to the output end of the first hydraulic telescopic rod. A drive shaft is fixedly provided on the outer surface of the second bearing seat. The top end of the drive shaft is hinged to the output end of the second hydraulic telescopic rod through a transmission rod; the fixed ends of the first and second hydraulic telescopic rods are both hinged to the machine body, and the drive shaft is rotatably connected to the machine body.

[0013] Furthermore, both the rotating shaft and the main shaft are hollow structures. A tie rod is installed in the cavity of the rotating shaft along the left-right direction. The left end of the tie rod is fixed to the spoke roller by a locking bolt. The spoke roller slides on the outer surface of the left end of the rotating shaft along the left-right direction. A fixed tie rod cylinder is rotatably connected to the right end of the main shaft. The tie rod cylinder, motor, and gearbox are fixedly installed together. The gearbox is placed in a receiving hole. The tie rod cylinder, motor, and gearbox can all rotate around the drive shaft. The output shaft of the tie rod cylinder extends into the cavity of the main shaft and communicates with the right end of the tie rod. The thrust bearing is rotatably connected to the rotating shaft. The thrust bearing, which is slidably disposed in the cavity of the rotating shaft in the left-right direction, includes a left bearing disc and a right bearing disc. The right side of the right bearing disc is fixedly disposed with the output shaft of the tie rod cylinder, and the left side of the left bearing disc abuts against the right end of the tie rod. Several disc springs are sleeved on the tie rod located in the cavity of the rotating shaft. A retaining ring is sleeved on the tie rod located at the right end of the disc spring. A clamping nut is threadedly connected to the tie rod located outside the retaining ring. The left end of the disc spring abuts against the inner wall of the cavity of the rotating shaft, and the right end of the disc spring abuts against the clamping nut through the retaining ring.

[0014] Furthermore, a rear pull sleeve is threadedly connected to the left end of the output shaft of the pull rod cylinder. The rear pull sleeve is fixedly installed on the right side of the thrust bearing, and a front pull sleeve is fixedly installed on the left side of the thrust bearing. The front pull sleeve is fitted onto the right end of the pull rod. A pin is fixedly installed on the left side of the front pull sleeve. The pin is adapted to a limiting groove opened on the outer surface of the clamping nut. The front pull sleeve slides left and right with the clamping nut through the cooperation of the pin and the limiting groove.

[0015] Furthermore, an L-frame is fixedly installed on the front side of the machine body, and a detection camera is fixedly installed on the L-frame along the front-back direction.

[0016] I. This invention, by setting up a main roll assembly, a centering roll assembly, a drive unit, and a spoke roll assembly, allows the wheel to be placed between the right ends of the two centering roll assemblies and the right end of the main roll assembly using a robotic arm. Then, the main hydraulic telescopic rod drives the main roll assembly to move to the right, achieving synchronous inward movement of the right ends of the main roll assembly and the two centering roll assemblies to clamp the wheel's tread. The spoke roll assembly then rubs against the inner edge of the wheel, causing it to rotate. Simultaneously, a backward force is generated at the contact point between the spoke roll assembly and the inner edge of the wheel, creating a spoke-expanding effect on the inner edge of the wheel. This also increases the contact force between the wheel tread and the main roll, ensuring the smoothness of the wheel's rotation.

[0017] II. By setting up a centering roller, guide rod, base plate, and first compensating spring, this invention allows for the following when the wheel tread is a regular circle: when the centering roller and main roller clamp the wheel, the centering roller is squeezed, causing the mounting block, guide rod, and base plate to move upward until the upper end face of the base plate contacts the lower end face of the limiting ring, thus forming a rigid contact between the circumferential surface of the centering roller and the wheel tread. If the wheel tread is a slightly irregular circle, when the centering roller and main roller clamp the wheel, if the circumferential surface of the centering roller contacts the irregular concavity of the wheel, the centering roller moves downward under the push of the first compensating spring until the circumferential surface of the centering roller contacts the wheel tread, thus forming a flexible contact between the circumferential surface of the centering roller and the wheel tread, effectively maintaining the smooth rotation of the wheel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the wheel in this invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the bearing housing in this invention;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the follower plate in this invention;

[0022] Figure 5 This is a front view schematic diagram of the follower plate structure in this invention;

[0023] Figure 6 This is a front view schematic diagram of the articulated arm structure in this invention;

[0024] Figure 7 This is a three-dimensional structural diagram of the drive rod in this invention;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the main roll in this invention;

[0026] Figure 9 This is a schematic diagram of the internal three-dimensional structure of the shell in this invention;

[0027] Figure 10 This is a three-dimensional structural diagram of the threaded column and guide rod in the separated state in this invention;

[0028] Figure 11 This is a schematic diagram of the three-dimensional structure of the fixing block in this invention;

[0029] Figure 12 This is a three-dimensional structural diagram of the slide rail and mounting plate in their separated state in this invention;

[0030] Figure 13This is a three-dimensional structural diagram of the gearbox in this invention;

[0031] Figure 14 This is a schematic diagram of the three-dimensional structure of the cylindrical body in this invention;

[0032] Figure 15 This is a schematic diagram of the internal structure of the cylinder in this invention;

[0033] Figure 16 This is a three-dimensional structural diagram of the rotating shaft and main shaft in this invention;

[0034] Figure 17 This is a schematic diagram of the internal structure of the rotating shaft and the main shaft in this invention;

[0035] Figure 18 For the present invention Figure 17 Enlarged schematic diagram of the structure at point A in the diagram;

[0036] Figure 19 This is a schematic diagram of the three-dimensional structure of the disc spring in this invention;

[0037] Figure 20 For the present invention Figure 19 Enlarged schematic diagram of the structure at point B in the diagram. Detailed Implementation

[0038] Please see Figure 1-20 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0039] The wheel hot rolling centering and spreading mechanism of the present invention includes a main roll assembly 10 slidably disposed in a mounting groove 2 of a machine body 1 along the left-right direction and a centering roll assembly 11 symmetrically disposed relative to the main roll assembly 10 along the up-down direction. Both centering roll assemblies 11 are hinged to the machine body 1. A driving unit is provided on the main roll assembly 10, which is used to drive the left ends of the two centering roll assemblies 11 to rotate simultaneously when the main roll assembly 10 moves to the right, thereby causing the right ends of the two centering roll assemblies 11 and the right end of the main roll assembly 10 to move inward synchronously. At any position during this process, the two centering roll assemblies 11... The right end of component 11 and the right end of the main roll assembly 10 are always tangent to the circumferential surface of the corresponding virtual circle, and the inscribed circles of the right ends of the two centering roll assemblies 11 and the right end of the main roll assembly 10 are always concentric; the left end of the main roll assembly 10 is provided with a main hydraulic telescopic rod 12, which is used to drive the main roll assembly 10 to move left and right; two spoke roller assemblies are provided inside the machine body 1, which are used to drive the wheel 7 to rotate by rubbing the inner edge of the wheel 7, and at the same time, the position where the spoke roller assembly contacts the inner edge of the wheel 7 generates a backward force, which produces a radial expansion effect on the inner edge of the wheel 7.

[0040] When the main roll assembly 10 moves to the right, it drives the drive unit to move to the right synchronously, causing the drive unit to drive the left ends of the two centering roll assemblies 11 to rotate synchronously. This causes the right ends of the two centering roll assemblies 11 and the right end of the main roll assembly 10 to move synchronously closer to each other, achieving the purpose of synchronous inward movement of the right ends of the main roll assembly 10 and the right ends of the two centering roll assemblies 11. In use, the freshly forged wheel 7 is placed between the right ends of the two centering roll assemblies 11 and the right end of the main roll assembly 10 by a robotic arm, and then the main roll assembly 10 is driven by the main hydraulic telescopic rod 12. The roller assembly 10 moves to the right, so that the right end of the main roller assembly 10 and the right ends of the two centering roller assemblies 11 move inward synchronously to clamp the tread surface of the wheel 7. At any position when the right end of the main roller assembly 10 and the right ends of the two centering roller assemblies 11 move inward synchronously, there is an inscribed circle, and the inscribed circles are concentric, which ensures that the tread surface of the wheel 7 is effectively clamped. Then, the spoke roller assembly drives the wheel 7 to rotate, and the wheel 7 is hot rolled. At the same time, the position where the spoke roller assembly contacts the inner edge of the wheel 7 generates a backward force, which produces a spoke-expanding effect on the inner edge of the wheel 7.

[0041] In this embodiment, the centering roller assembly 11 includes a hinged arm 13 and a centering roller 14 rotatably connected to the right end of the hinged arm 13. The middle section of the hinged arm 13 is hinged to the machine body 1. The drive unit moves to the right and drives the left end of the hinged arm 13 to rotate the right end of the hinged arm 13 downward.

[0042] In this embodiment, the main roll assembly 10 includes a drive rod 15 and a main roll 16 rotatably connected to the right end of the drive rod 15. The left end of the drive rod 15 is fixedly disposed with the output end of the main hydraulic telescopic rod 12. The drive rod 15 is located in the mounting groove 2 of the machine body 1 and is slidably disposed with respect to the machine body 1 in the left-right direction. The drive unit includes a drive block 17 fixedly disposed on the drive rod 15. Cam surfaces 18 are provided on the upper and lower parts of the right side face of the drive block 17. A follower mechanism is provided on the hinge arm 13. The follower mechanism is used to ensure that the left end of the hinge arm 13 is always in contact with the cam surface 18 when the drive block 17 moves left and right. When the main hydraulic telescopic rod 12 pushes the drive rod 15 and the main roll 16 to move to the right, it simultaneously drives the drive block 17 to move to the right. The drive block 17 drives the left end of the hinge arm 13 to rotate through the cam surface 18, thereby causing the right ends of the two hinge arms 13 to rotate closer to each other. This, in turn, drives the two centering rolls 14 to rotate closer to each other, so that the two centering rolls 14 and the main roll... Roller 16 moves inward synchronously, and at any position during this process, the circumferential surfaces of the two centering rollers 14 and the main roller 16 are always tangent to the circumferential surface of the corresponding virtual circle, and the inscribed circles of the two centering rollers 14 and the main roller 16 are always concentric; when the main hydraulic telescopic rod 12 drives the drive block 17 to move to the left, the drive block 17 drives the hinge arm 13 to rotate through the follower mechanism, so that the left end of the hinge arm 13 is always in contact with the cam surface 18, thereby causing the right ends of the two hinge arms 13 to move in the same direction. The moving centering rollers 14 move away from each other to achieve the purpose of opening the centering mechanism; the cam surface 18 is a continuous and smooth simulated curve. When the drive block 17 moves left and right, the left end of the hinge arm 13 is always in contact with the cam surface 18 of the drive block 17. The cam surface 18 makes the position of the centering roller 14 at the right end of the hinge arm 13 always correspond to the position of the main roll 16, so that the circumferential surfaces of the two centering rollers 14 and the circumferential surface of the main roll 16 are tangent to a virtual circumferential surface.

[0043] In this embodiment, the follower mechanism includes two follower plates 19. The left end of each follower plate 19 is hinged to the body 1. Each follower plate 19 has an arc-shaped hole 20 in the middle along the left-right direction and an adaptation hole 21 in the right side. The front side of each drive block 17 is fixedly provided with a main pin 22 located in the corresponding arc-shaped hole 20, and the left side of the front side of each hinge arm 13 is fixedly provided with a secondary pin 23 located in the corresponding adaptation hole 21. In use, when the drive block 17 moves to the right, the drive block 17 drives the left end of the hinge arm 13 to rotate through the cam surface 18, thereby causing the right ends of the hinge arms 13 to move closer to each other. At the same time, the drive block 17 drives the main pin 22 to move linearly to the right. Due to the arc-shaped hole 20, the follower... The movement of the right ends of the plates 19 away from each other causes the follower plate 19 to move along with the left end of the articulated arm 13 without interfering with the movement of the articulated arm 13. When the drive block 17 moves to the left, the cam surface 18 of the drive block 17 moves away from the left end of the articulated arm 13, and the main pin 22 moves linearly to the left. Due to the arc hole 20, the main pin 22 drives the right ends of the follower plates 19 to move closer to each other. This causes the right ends of the follower plates 19 to move closer to each other through the cooperation of the auxiliary pin 23 and the adaptation hole 21, so that the left end of the articulated arm 13 is always in contact with the cam surface 18 of the drive block 17. This causes the right end of the articulated arm 13 to drive the centering roller 14 to move away from each other, thus opening the centering mechanism and facilitating the removal of the wheel 7.

[0044] The arc-shaped hole 20 and the adaptation hole 21 of the follower plate 19 mentioned above must meet two conditions: when the drive block 17 moves to the right, the follower plate 19 moves accordingly without interfering with the movement of the left end of the articulated arm 13; when the drive block 17 moves to the left, the follower plate 19 drives the left ends of the articulated arm 13 to move closer to each other, so that the left end of the articulated arm 13 is always in contact with the corresponding cam surface 18.

[0045] In practical applications, the tread surface of a hot-forged wheel 7 may be a slightly irregular circle. Since the circumferential surfaces of the main roll 16 and the two centering rolls 14 are always tangent to the circumferential surface of a virtual circle as they move inwards, a centering roll 14 or the main roll 16 may not contact the tread surface of the wheel 7, causing the wheel 7 to rotate unevenly. To solve this problem, in this embodiment, a first compensation mechanism is provided between the hinge arm 13 and the centering roll 14; a second compensation mechanism is provided between the drive rod 15 and the main roll 16. The first compensation mechanism is used to drive the centering roll 14 to move inwards to contact the tread surface of the wheel 7 when the centering roll 14 is not in contact with the tread surface of the wheel 7 during clamping; the second compensation mechanism is used to drive the main roll 16 to move inwards to contact the tread surface of the wheel 7 when the main roll 16 is not in contact with the tread surface of the wheel 7 during clamping, thus ensuring smooth rotation of the wheel 7.

[0046] In this embodiment, the front and rear sides of the machine body 1 are provided with receiving holes 60, and the spoke roller assembly is located in the corresponding receiving holes 60. The spoke roller assembly includes a cylinder 61, and a rotating shaft 62 is rotatably connected inside the cylinder 61. A spoke roller 8 is provided at the left end of the rotating shaft 62, and a main shaft 63 is fixedly provided at the right end of the rotating shaft 62. The main shaft 63 is connected to the output end of the motor 65 through a gearbox 64. A first bearing seat 66 and a second bearing seat 67 are fixedly provided at the left and right ends of the cylinder 61, respectively. The rotating shaft 62 is rotatably connected to the first bearing seat 66 and the second bearing seat 67 through roller bearings 68, respectively. The outer surface of the first bearing seat 66 is hinged to the output end of the first hydraulic telescopic rod 69, and the outer surface of the second bearing seat 67 is fixed. A drive shaft 70 is provided, and the top end of the drive shaft 70 is hinged to the output end of the second hydraulic telescopic rod 71 via a transmission rod 72. The fixed ends of the first hydraulic telescopic rod 69 and the second hydraulic telescopic rod 71 are both hinged to the machine body 1, and the drive shaft 70 is rotatably connected to the machine body 1. In use, the extension and retraction of the second hydraulic telescopic rod 71 drives the drive shaft 70 to rotate via the transmission rod 72, which in turn drives the cylinder 61 to rotate via the second bearing seat 67. This causes the cylinder 61 to drive the rotating shaft 62, the spoke roller 8, the main shaft 63, and the motor 65 to rotate around the drive shaft 70, thereby adjusting the contact angle between the spoke roller 8 and the wheel rim 7. When the second hydraulic telescopic rod 71 moves, the first hydraulic telescopic rod 69 makes an adaptive movement.

[0047] In this embodiment, the top end of the drive shaft 70 is fixedly connected to the transmission rod 72, and the outer end of the transmission rod 72 is hinged to the output end of the second hydraulic telescopic rod 71.

[0048] When the wheel 7 is hot-rolled by the wheel rolling mill, the wheel 7 is in a vertical position. Two spoke rollers 8 are respectively positioned on both sides of the wheel 7, with their inner edges of the wheel 7's sides enclosed by frustums 84. The contact angle between the frustums 84 of the spoke rollers 8 and the wheel rim of the wheel 7 can be adjusted by the first hydraulic telescopic rod 69 and the second hydraulic telescopic rod 71. Then, the motor 65 drives the main shaft 63 to rotate, and the main shaft 63 drives the spoke rollers 8 to rotate via the rotating shaft 62. The spoke rollers 8 drive the wheel 7 to rotate through friction with the wheel 7, thus achieving the purpose of the spoke rollers 8 driving the wheel 7 to rotate. On this basis, in order to allow the spoke rollers 8 to retract relative to the wheel 7 along their own length direction, so that the frustums 84 of the spoke rollers 8 can be aligned with the wheel rim of the wheel 7, the spoke rollers 8 can be aligned with the wheel rim of the wheel 7. The purpose of expanding the rim of wheel 7 is as follows: In this embodiment, both the rotating shaft 62 and the main shaft 63 are hollow structures. A pull rod 73 is arranged in the cavity of the rotating shaft 62 along the left-right direction. The left end of the pull rod 73 is fixed to the spoke roller 8 by a locking bolt. The spoke roller 8 is slidably arranged on the outer surface of the left end of the rotating shaft 62 along the left-right direction. The right end of the main shaft 63 is rotatably connected to a fixedly arranged pull rod cylinder 74. The pull rod cylinder 74, the motor 65, and the gearbox 64 are fixedly arranged together. The gearbox 64 is placed in the receiving hole 60. The pull rod cylinder 74, the motor 65, and the gearbox 64 can all rotate around the drive shaft 70. The output shaft of the pull rod cylinder 74 extends into the cavity of the main shaft 63 and is pushed by the right end of the pull rod 73. The bearing is rotatably connected; the thrust bearing, which is slidably disposed in the cavity of the rotating shaft 62 in the left-right direction, includes a left bearing disc 75 and a right bearing disc 76. The right side of the right bearing disc 76 is fixedly disposed with the output shaft of the pull rod cylinder 74, and the left side of the left bearing disc 75 abuts against the right end of the pull rod 73. Several disc springs 77 are sleeved on the pull rod 73 located in the cavity of the rotating shaft 62. A retaining ring 78 is sleeved on the pull rod 73 located at the right end of the disc spring 77. A clamping nut 79 is threadedly connected to the pull rod 73 located outside the retaining ring 78. The left end of the disc spring 77 abuts against the inner wall of the cavity of the rotating shaft 62, and the right end of the disc spring 77 abuts against the clamping nut 79 through the retaining ring 78. The disc spring 77 pushes through the retaining ring 78 and the clamping nut 79. The movable lever 73 moves to the right, causing its right end to contact the left side of the left bearing disc 75. During operation, while the motor 65 drives the spoke roller 8 to rotate, the lever cylinder 74 retracts, causing the right bearing disc 76 to move to the right, which in turn causes the left bearing disc 75 to move to the right. This creates a gap at the right end of the lever 73, and the lever 73, pushed by the disc spring 77, moves to the right and contacts the left side of the left bearing disc 76. The movement of the lever 73 to the right simultaneously drives the spoke roller 8 to move to the right, achieving the purpose of expanding the inner edge of the wheel 7 by the frustum 84 of the spoke roller 8. The left bearing disc 75 is fitted inside the drive shaft 62. Since the right bearing disc 76 is fixed to the output shaft of the lever cylinder 74, it does not rotate.

[0049] In operation, motor 65 sequentially drives the main shaft 63 to rotate, the rotating shaft 62 to rotate, and the spoke roller 8 and pull rod 73 to rotate. The left bearing disc 75 of the thrust bearing rotates with the rotating shaft 62, while the pull rod cylinder 74, its output shaft, and the right bearing disc 76 remain stationary within the main shaft 63. The output shaft of the pull rod cylinder 74 retracts to the right, thereby causing the right bearing disc 76 to move to the right within the cavity of the rotating shaft 62. At this point, a gap appears between the right end of the pull rod 73 and the left side of the left bearing disc 75. Spring 77 pushes pull rod 73 to the right through clamping nut 79, so that the right end of pull rod 73 always keeps in close contact with thrust bearing. The movement of pull rod 73 to the right drives spoke roller 8 to move to the right, so that the frustum 84 of spoke roller 8 expands outward against the inner edge of wheel 7. In conjunction with the second compensation mechanism, when the tread of wheel 7 is irregularly shaped and the main roller 16 does not contact the tread of wheel 7, the backward force of spoke roller 8 drives wheel 7 to contact the main roller 16; the compensation of the second compensation mechanism is zero.

[0050] In this embodiment, the left end of the output shaft of the pull rod cylinder 74 is threadedly connected to a rear pull sleeve 80, which is fixedly disposed on the right side of the thrust bearing. A front pull sleeve 81 is fixedly disposed on the left side of the thrust bearing and is sleeved on the right end of the pull rod 73. When the pull rod cylinder 74 drives the thrust bearing to move to the right through the rear pull sleeve 80, the front pull sleeve 81 moves to the right, causing a gap to be generated between the right end of the pull rod 73 and the front pull sleeve 81. At this time, the disc spring 77 pushes the pull rod 73 to move to the right through the rear retaining ring 78 and the clamping nut 79, so that the right end of the pull rod 73 and the inner bottom wall of the front pull sleeve 81 always remain in close contact.

[0051] When the wheel 7 is hot rolled in the rolling mill, the spoke roll 8 is subjected to harsh stress, causing the tie rod 73 to bear the combined effects of torque, bending moment, shear stress, and axial force. The tie rod 73 is prone to breakage. In actual production, the tie rod 73 needs to be disassembled, repaired, or replaced frequently. In order to facilitate the disassembly of the tie rod 73, in this embodiment, a pin 82 is fixedly installed on the left side of the front tie sleeve 81. The pin 82 is adapted to the limiting groove 83 opened on the outer surface of the clamping nut 79. The front tie sleeve 81 slides left and right with the clamping nut 79 through the cooperation of the pin 82 and the limiting groove 83. When the tie rod cylinder 74 drives the rear tie sleeve 80, the thrust bearing, and the front tie sleeve 81 to move to the right through the output shaft of the tie rod cylinder 74, the front tie sleeve 81 drives the pin 82 to slide to the right in the limiting groove 83 of the clamping nut 79 but does not disengage from the limiting groove 83 of the clamping nut 79. At this time, due to the tie rod 73 A gap is created between the right end of the lever 73 and the front pull sleeve 81. The disc spring 77 drives the lever 73 to move to the right through the clamping nut 79, keeping the right end of the lever 73 in close contact with the inner bottom wall of the front pull sleeve 81. At the same time, the lever 73 drives the spoke roller 8 to move to the right, expanding the rim of the wheel 7. When the lever 73 needs to be disassembled, the motor 65 stops. First, the spoke roller 8 is removed from the left end of the lever 73. Then, the left end of the rotating shaft 62 is held still by clamping the left end of the rotating shaft 62 with a tool. Then, the left end of the lever 73 is rotated. At this time, the clamping nut 79 is kept stationary through the pin 82 and the front pull sleeve 81. The front pull sleeve 81 and the rotating shaft 62 are slidably connected in the left and right direction. The front pull sleeve 81 and the rotating shaft 62 are also kept stationary. By continuously rotating the lever 73, the lever 73 can be removed from the clamping nut 79, thus achieving the purpose of disassembling the lever 73 and facilitating the maintenance and replacement of the lever 73.

[0052] In this embodiment, the directional terms are... Figure 16For reference, the first compensation mechanism includes a housing 24 fixedly disposed to the right end of the hinge arm 13, a centering roller 14 rotatably connected to the inside of the mounting block 25, a guide rod 26 fixedly disposed on the upper end face of the mounting block 25, the guide rod 26 passing through the housing 24 in the vertical direction; a base plate 27 fixedly disposed on the guide rod 26 located in the housing 24, a first compensation spring 28 sleeved on the guide rod 26 located in the housing 24, the bottom end of the first compensation spring 28 fixedly disposed to the base plate 27, and a limit ring 29 fixedly disposed in the housing 24 above the base plate 27; the mounting block 25 and the right end face of the hinge arm 13 are slidably disposed in the vertical direction; if the tread of the wheel 7 is a regular circle, when the centering roller 14 and the main roller 16 clamp the wheel 7, the centering roller 14 is squeezed, causing the mounting block 25, the guide rod 26 and the base plate 27 to move upward until the upper end face of the base plate 27 is flush with the limit ring 29. When the lower end face of the centering roller 14 contacts the tread surface of the wheel 7, a rigid contact is formed between the circumferential surface of the centering roller 14 and the tread surface of the wheel 7. If the tread surface of the wheel 7 is a slightly irregular circle, when the centering roller 14 and the main roll 16 clamp the wheel 7, if the circumferential surface of the centering roller 14 contacts the irregular concave part of the wheel 7, the centering roller 14 moves downward under the push of the first compensation spring 28 until the circumferential surface of the centering roller 14 contacts the tread surface of the wheel 7, and a flexible contact is formed between the circumferential surface of the centering roller 14 and the tread surface of the wheel 7, effectively maintaining the smooth rotation of the wheel 7. When the wheel 7 is hot-rolled, the irregular part of the wheel 7 moves along the circumference, and the centering roller 14 and the main roll 16 will periodically make adaptive compensation contact to ensure the smooth rotation of the wheel 7. If one of the centering rollers 14 contacts the irregular protrusion of the wheel 7, the other centering roller 14 and the main roll 16 will both make compensation contact.

[0053] In this embodiment, the main roller 16 is rotatably connected within two clamping plates 30. The drive rod 15 is slidably disposed within the two clamping plates 30 in the left-right direction. The second compensation mechanism includes sliders 31 slidably disposed on both the upper and lower ends of the drive rod 15 in the left-right direction. Each slider 31 is fixedly disposed with each clamping plate 30. A second compensation spring 32 is fixedly disposed between the drive block 17 and each slider 31. A limit block 33 is fixedly disposed on both the upper and lower ends of the drive rod 15. A through hole 34 is opened on the limit block 33, and the second compensation spring 32 passes through the through hole 34 of the limit block 33. If the tread surface of the wheel 7 is a regular circle, when the centering roller 14 and the main roller 16 clamp the wheel 7, the main roller 16 is squeezed, causing the main roller 16 to slide to the left along the drive rod 15 through the clamping plates 30 until the slider 31 abuts against the right side of the limit block 33. The circumferential surface of roller 16 forms a rigid contact with the tread surface of wheel 7, effectively maintaining the smooth rotation of wheel 7. If the tread surface of wheel 7 is a slightly irregular circle, when centering roller 14 and main roller 16 clamp wheel 7, if the circumferential surface of main roller 16 is in contact with the irregular concavity of wheel 7, then main roller 16 moves to the right under the push of second compensation spring 32 until the circumferential surface of main roller 16 contacts the tread surface of wheel 7, thus forming a flexible contact between the circumferential surface of main roller 16 and the tread surface of wheel 7, effectively maintaining the smooth rotation of wheel 7. When wheel 7 is hot-rolled, the irregular part of wheel 7 moves along the circumference, and centering roller 14 and main roller 16 will periodically make adaptive compensation contact to ensure the smooth rotation of wheel 7. If one of the main rollers 16 contacts the irregular protrusion of wheel 7, then the other two centering rollers 14 will make compensation contact.

[0054] To allow for adjustment of the preload of the first compensating spring 28 during use, in this embodiment, an adjusting plate 35 is fixedly mounted on the top of the first compensating spring 28. The adjusting plate 35 is slidably mounted within the housing 24 in the vertical direction. A threaded post 36 is rotatably connected to the upper end face of the adjusting plate 35, and the outer surface of the threaded post 36 is threadedly connected to the housing 24. Guide rods 26 are sleeved within the adjusting plate 35 and the threaded post 36. During use, if the elasticity of the first compensating spring 28 weakens, the threaded post 36 can be rotated to move downward along the housing 24, thereby causing the adjusting plate 35 to move downward and compressing the first compensating spring 28 to increase its preload.

[0055] In this embodiment, the outer surface of the guide rod 26 is provided with a guide groove 37 in the vertical direction, and the inner sidewall of the adjusting plate 35 is fixedly provided with a guide block 38 that is adapted to the guide groove 37. When the adjusting plate 35 moves up and down, the guide block 38 slides up and down in the guide groove 37 to limit the rotation of the adjusting plate 35.

[0056] To allow adjustment of the preload of the second compensating spring 32 during use, in this embodiment, a buffer hole 39 is provided in the driving block 17 at the position corresponding to the second compensating spring 32 in the left-right direction. A push block 40 is slidably disposed in the buffer hole 39 and fixedly disposed at the left end of the second compensating spring 32. An adjusting bolt 41 is rotatably connected to the left side of the push block 40. A cover plate 42 is threadedly connected to the outer surface of the adjusting bolt 41. The cover plate 42 is fixedly disposed with the driving block 17. During use, if the elasticity of the second compensating spring 32 weakens, the adjusting bolt 41 can be rotated to move the adjusting bolt 41 to the right, thereby causing the adjusting bolt 41 to drive the push block 40 to move to the right, thus compressing the second compensating spring 32 and increasing the preload of the second compensating spring 32.

[0057] In this embodiment, a first rotating shaft 43 is fixedly installed inside the upper hinge arm 13. The portions of the first rotating shaft 43 located on both sides of the upper hinge arm 13 are rotatably connected to first bushings 44. Each first bushing 44 is fixedly installed to the body 1. The upper hinge arm 13 rotates within the first bushings 44 via the first rotating shaft 43.

[0058] In this embodiment, a second rotating shaft 45 is fixedly installed inside the lower hinge arm 13. Both ends of the second rotating shaft 45 are rotatably connected to bearing seats 46, and each bearing seat 46 is fixedly installed to the body 1. The lower hinge arm 13 rotates within the bearing seat 46 through the second rotating shaft 45.

[0059] In this embodiment, an L-frame 58 is fixedly installed on the front side of the machine body 1, and a detection camera 59 is fixedly installed on the L-frame 58 along the front-rear direction. The centers of the inscribed circles of the main roll 16 and the two centering rolls 14 are fixed. When the wheel 7 is hot rolled, after the wheel 7 reaches the required hot rolling, the detection camera 59 detects the wheel 7 and calculates the trajectory of the center of the wheel 7 during rotation. The trajectory of the center of the wheel 7 during rotation is an irregular shape around the center of the inscribed circles of the main roll 16 and the two centering rolls 14. The farthest distance between the irregular shape and the center of the inscribed circles of the main roll 16 and the two centering rolls 14 is calculated. If this distance is within the set range, it means that the tread of the wheel 7 is circular as required. If this distance exceeds the set range, it means that the irregularity of the circularity of the tread of the wheel 7 exceeds the range, and hot rolling needs to continue.

[0060] In this embodiment, the mounting block 25 includes a mounting plate 601 and two side plates 611 disposed on the lower end face of the mounting plate 601. The centering roller 14 is rotatably connected between the two side plates 611. The upper end face of the mounting plate 601 is fixedly disposed with the housing 24. A connecting plate 621 is fixedly disposed between the two side plates 611. An adjustment structure is provided between the connecting plate 621 and the mounting plate 601. The adjustment mechanism is used to adjust the front and rear positions of the two side plates 611 and the connecting plate 621 relative to the mounting plate 601 so that the centering roller 14 adapts to the position of the wheel 7.

[0061] In this embodiment, the adjustment mechanism includes a slide rail 631 fixedly mounted on the upper surface of the connecting plate 621 along the front-back direction. A groove 641 adapted to the slide rail 631 is formed on the lower surface of the mounting plate 601 along the front-back direction. Fixing blocks 661 are fixedly mounted on the front and rear sides of the mounting plate 601 by two fixing bolts 651. A set screw 671 and an adjusting bolt 681 are provided on the fixing block 661. The set screw 671 is threadedly connected to the fixing block 661, and the adjusting bolt 681 is rotatably connected to the fixing block 661. The head of the set screw 671 abuts against the end face of the slide rail 631, and the adjusting bolt 681 is rotatably connected to the slide rail. The threaded hole on the end face of 631 is threaded for connection; when adjusting the front and rear position of the centering roller 14, first screw the set screw 671 so that the set screw 671 is pulled out from the inside of the fixed block 661, thereby causing the head of the set screw 671 to separate from the end face of the slide rail 631. Then rotate the adjusting bolt 681 so that the slide rail 631 moves back and forth in the slide groove 641 of the mounting plate 601, thereby causing the slide rail 631 to drive the centering roller 14 to move back and forth relative to the mounting plate 601 through the connecting plate 621 and the two side plates 611, thereby achieving the purpose of adjusting the front and rear position of the centering roller 14 so as to better contact the tread of the wheel 7.

[0062] To facilitate the disassembly and installation of the slide rail 631 and the mounting plate 601, in this embodiment, the slide rail 631 is an inverted isosceles trapezoidal structure, and the slide groove 641 is a right-angled trapezoidal structure. A trapezoidal block 691 is fixedly installed along the front-back direction of the right-angled side of the slide groove 641. The space formed by the hypotenuse of the trapezoidal block 691 and the slide groove 641 is adapted to the slide rail 631. The trapezoidal block 691 is fixed to the mounting plate 601 by a vertical bolt 701. During disassembly, first remove the fixing bolt 651, rotate the adjusting bolt 681 to disengage from the slide rail 631, and then remove the vertical bolt 701 to remove the trapezoidal block 691. At this time, the slide rail 631 can be disengaged from the slide groove 641, thereby achieving the purpose of disassembling the centering roller 14. During installation, first connect the two side plates 611 and the connecting plate 621 through the slide rail 631. The centering roller 14 is installed by placing the 31 in the slide groove 641 and then fixing the trapezoidal block 691 in the slide groove 641 of the mounting plate 601 with the vertical bolt 701. Then, the fixing block 661 is fixed on the mounting plate 601 with the fixing bolt 651 and the set screw 671 is installed on the mounting plate 601. When installing the fixing block 661, the adjusting bolt 681 needs to be screwed into the threaded hole of the slide rail 631 first so that the fixing block 661 can fit against the end face of the mounting plate 601, and then the fixing block 661 is fixedly installed. The head of the set screw 671 abuts against the slide rail 631 to lock the slide rail 631. The side of the housing 24 is provided with a relief groove 711, and the nut of the vertical bolt 701 is located in the relief groove 711, which facilitates the disassembly and installation of the vertical bolt 701.

[0063] The working principle of this invention is as follows: In use, a robotic arm clamps the calcined wheel 7 and places it between two centering rollers 14 and the main roller 16. When the main hydraulic telescopic rod 12 pushes the drive rod 15 to move to the right, it drives the drive block 17 to move to the right. The drive block 17 drives the left end of the hinge arm 13 to rotate through the cam surface 18, thereby causing the right ends of the hinge arms 13 to move closer together. This causes the two centering rollers 14 and the main roller 16 to move inward to clamp the tread surface of the wheel 7. Then, the motor 6... 5 drives the spoke roller 8 to rotate, and the spoke roller 8 drives the wheel 7 to rotate, performing hot rolling on the wheel. At the same time, the pull rod cylinder 74 retracts, causing the right bearing disc 76 to move to the right, which in turn causes the left bearing disc 75 to move to the right, creating a gap between the right end of the pull rod 73 and the right bearing disc 76. The pull rod 73 moves to the right under the push of the disc spring 77 and comes into contact with the left side of the left bearing disc 76. The movement of the pull rod 73 to the right also drives the spoke roller 8 to move to the right, achieving the purpose of expanding the inner edge of the wheel 7 by the frustum 84 of the spoke roller 8.

Claims

1. A hot-rolled centering and spreading mechanism for wheels, characterized in that: The assembly includes a main roll assembly (10) that slides in the mounting groove (2) of the machine body (1) in the left-right direction and a centering roll assembly (11) that is symmetrically arranged relative to the main roll assembly (10) in the up-down direction. Both centering roll assemblies (11) are hinged to the machine body (1). The main roll assembly (10) is provided with a drive unit, which is used to drive the left ends of the two centering roll assemblies (11) to rotate simultaneously when the main roll assembly (10) moves to the right, thereby causing the right ends of the two centering roll assemblies (11) and the right end of the main roll assembly (10) to move inward synchronously. At any position during this process, the two centering roll assemblies... The right end of (11) and the right end of the main roll assembly (10) are always tangent to the circumferential surface of the corresponding virtual circle, and the inscribed circles of the right ends of the two centering roll assemblies (11) and the right end of the main roll assembly (10) are always concentric; the left end of the main roll assembly (10) is provided with a main hydraulic telescopic rod (12), which is used to drive the main roll assembly (10) to move left and right; two spoke roller assemblies are provided inside the machine body (1), which are used to drive the wheel (7) to rotate by rubbing the inner edge of the wheel (7), and at the same time, the position where the spoke roller assembly contacts the inner edge of the wheel (7) generates a backward force.

2. The hot-rolled centering and spreading mechanism for wheels according to claim 1, characterized in that: The centering roller assembly (11) includes a hinge arm (13) and a centering roller (14) rotatably connected to the right end of the hinge arm (13). The middle section of the hinge arm (13) is hinged to the machine body (1). The main roller assembly (10) includes a drive rod (15) and a main roller (16) rotatably connected to the right end of the drive rod (15). The left end of the drive rod (15) is fixedly set to the output end of the main hydraulic telescopic rod (12). The drive rod (15) is located in the mounting groove (2) of the machine body (1) and slides with the machine body (1) in the left and right directions. The drive part includes a drive block (17) fixedly set on the drive rod (15). The upper and lower parts of the right side of the drive block (17) are provided with cam surfaces (18). The hinge arm (13) is provided with a follower mechanism. The follower mechanism is used to keep the left end of the hinge arm (13) in contact with the cam surface (18) when the drive block (17) moves left and right.

3. The hot-rolled centering and spreading mechanism for wheels according to claim 2, characterized in that: The following mechanism includes two following plates (19). The left end of each following plate (19) is hinged to the body (1). An arc-shaped hole (20) is opened in the middle of each following plate (19) along the left and right directions. An adaptation hole (21) is opened on the right side of each following plate (19). A main pin (22) located in the corresponding arc-shaped hole (20) is fixedly provided on the front side of each driving block (17). A secondary pin (23) located in the corresponding adaptation hole (21) is fixedly provided on the left side of the front side of each hinge arm (13).

4. The hot-rolled centering and spreading mechanism for wheels according to claim 2, characterized in that: A first compensation mechanism is provided between the articulated arm (13) and the centering roller (14); a second compensation mechanism is provided between the drive rod (15) and the main roller (16); the first compensation mechanism is used to drive the centering roller (14) to move inward to contact the tread surface of the wheel (7) when the centering roller (14) is not in contact with the tread surface of the wheel (7) when clamping the wheel (7); the second compensation mechanism is used to drive the main roller (16) to move inward to contact the tread surface of the wheel (7) when the main roller (16) is not in contact with the tread surface of the wheel (7) when clamping the wheel (7).

5. The hot-rolled centering and spreading mechanism for wheels according to claim 4, characterized in that: The first compensation mechanism includes a housing (24) fixedly disposed at the right end of the hinge arm (13), a centering roller (14) rotatably connected inside the mounting block (25), a guide rod (26) fixedly disposed on the upper end face of the mounting block (25), the guide rod (26) passing through the housing (24) in the vertical direction; a base plate (27) fixedly disposed on the guide rod (26) located inside the housing (24), a first compensation spring (28) sleeved on the guide rod (26) located inside the housing (24), the bottom end of the first compensation spring (28) fixedly disposed with the base plate (27), and a limit ring (29) fixedly disposed inside the housing (24) above the base plate (27).

6. The hot-rolled centering and spreading mechanism for wheels according to claim 5, characterized in that: The main roll (16) is rotatably connected to two clamping plates (30). The drive rod (15) is slidably disposed in the two clamping plates (30) in the left and right direction. The second compensation mechanism includes sliders (31) that are slidably disposed in the left and right direction on the upper and lower end surfaces of the drive rod (15). Each slider (31) is fixedly disposed with each clamping plate (30). A second compensation spring (32) is fixedly disposed between the drive block (17) and each slider (31). A limit block (33) is fixedly disposed on the upper and lower end surfaces of the drive rod (15). A through hole (34) is opened on the limit block (33). The second compensation spring (32) passes through the through hole (34) of the limit block (33).

7. The hot-rolled centering and spreading mechanism for wheels according to claim 6, characterized in that: The front and rear sides of the machine body (1) are provided with receiving holes (60), and the spoke roller assembly is located in the corresponding receiving holes (60); the spoke roller assembly includes a cylinder (61), and a rotating shaft (62) is rotatably connected inside the cylinder (61). A spoke roller (8) is provided at the left end of the rotating shaft (62), and a main shaft (63) is fixedly provided at the right end of the rotating shaft (62). The main shaft (63) is connected to the output end of the motor (65) through a gearbox (64). A first bearing seat (66) and a second bearing seat (67) are fixedly provided at the left and right ends of the cylinder (61), respectively. (62) The first bearing housing (66) and the second bearing housing (67) are rotatably connected by roller bearings (68). The outer surface of the first bearing housing (66) is hinged to the output end of the first hydraulic telescopic rod (69). The outer surface of the second bearing housing (67) is fixedly provided with a drive shaft (70). The top end of the drive shaft (70) is hinged to the output end of the second hydraulic telescopic rod (71) through a transmission rod (72). The fixed ends of the first hydraulic telescopic rod (69) and the second hydraulic telescopic rod (71) are both hinged to the machine body (1). The drive shaft (70) is rotatably connected to the machine body (1).

8. The hot-rolled centering and spreading mechanism for wheels according to claim 7, characterized in that: Both the rotating shaft (62) and the main shaft (63) are hollow structures. A pull rod (73) is arranged in the cavity of the rotating shaft (62) along the left and right directions. The left end of the pull rod (73) is fixed to the spoke roller (8) by a locking bolt. The spoke roller (8) is slidably arranged on the outer surface of the left end of the rotating shaft (62) along the left and right directions. A fixed pull rod cylinder (74) is rotatably connected to the right end of the main shaft (63). The pull rod cylinder (74), the motor (65), and the gearbox (64) are fixedly arranged together. The gearbox (64) is placed in the receiving hole (60). The pull rod cylinder (74), the motor (65), and the gearbox (64) can all rotate around the drive shaft (70). The output shaft of the pull rod cylinder (74) extends into the cavity of the main shaft (63) and is connected to the right end of the pull rod (73) by a push. The thrust bearing is rotatably connected; the thrust bearing, which is slidably disposed in the cavity of the rotating shaft (62) in the left and right direction, includes a left bearing disc (75) and a right bearing disc (76). The right side of the right bearing disc (76) is fixedly disposed with the output shaft of the pull rod cylinder (74), and the left side of the left bearing disc (75) abuts against the right end of the pull rod (73). Several disc springs (77) are sleeved on the pull rod (73) located in the cavity of the rotating shaft (62). A retaining ring (78) is sleeved on the pull rod (73) located at the right end of the disc spring (77). A clamping nut (79) is threadedly connected to the pull rod (73) located outside the retaining ring (78). The left end of the disc spring (77) abuts against the inner wall of the cavity of the rotating shaft (62), and the right end of the disc spring (77) abuts against the clamping nut (79) through the retaining ring (78).

9. The hot-rolled centering and spreading mechanism for wheels according to claim 1, characterized in that: The left end of the output shaft of the pull rod cylinder (74) is threaded with a rear pull sleeve (80). The rear pull sleeve (80) is fixedly installed on the right side of the thrust bearing. The left side of the thrust bearing is fixedly installed with a front pull sleeve (81). The front pull sleeve (81) is sleeved on the right end of the pull rod (73). A pin (82) is fixedly installed on the left side of the front pull sleeve (81). The pin (82) is adapted to the limiting groove (83) opened on the outer surface of the clamping nut (79). The front pull sleeve (81) slides left and right with the clamping nut (79) through the cooperation of the pin (82) and the limiting groove (83).

10. The hot-rolled centering and spreading mechanism for wheels according to claim 1, characterized in that: The front side of the machine body (1) is fixedly provided with an L-frame (58), and a detection camera (59) is fixedly provided on the L-frame (58) along the front-back direction.

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