Wheel hot rolling centering and spoke expanding mechanism

Abstract

The invention discloses a wheel rolling mill synchronous centering mechanism, and belongs to the technical field of steel wheel rolling mills, the wheel rolling mill synchronous centering mechanism comprises a main roller assembly slidably arranged in a mounting groove of a machine body in the left-right direction and centering roller assemblies symmetrically arranged relative to the main roller assembly in the up-down direction, and the two centering roller assemblies are both hinged to the machine body; a driving part is arranged on the main roller assembly and used for driving the left ends of the two centering roller assemblies to rotate at the same time when the main roller assembly moves rightwards, and then the right ends of the two centering roller assemblies and the right end of the main roller assembly synchronously move inwards. When the device is used, a wheel is placed between the right ends of the two centering roller assemblies and the right end of the main roller assembly through the mechanical arm, and then the main roller assembly is driven by the main hydraulic telescopic rod to move rightwards; the purpose that the right end of the main roller assembly and the right ends of the two centering roller assemblies synchronously move inwards to clamp the tread of the wheel is achieved, then friction is conducted on the inner edge of the wheel through the radial plate roller assembly to drive the wheel to rotate, and meanwhile retreating force is generated at the position, making contact with the inner edge of the wheel, of the radial plate roller assembly. A spoke expanding effect is generated on the inner edge of the wheel; and meanwhile, the contact force between the tread of the wheel and the main roller is increased all the time, and the rotating stability of the wheel is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of steel wheel rolling mills, and in particular relates to a wheel hot rolling centering and radial expansion mechanism. Background Art

[0002] At present, the wheel rolling mill is a kind of equipment for manufacturing railway train wheels. When manufacturing wheels, the heated blank is first pressed into shape by a press, then the wheel spokes are expanded and the wheel rim and tread are rolled out on the wheel rolling mill, and finally the wheel is precisely processed on a lathe.

[0003] The existing hot rolling mill for steel wheels generally includes main rollers, upper centering rollers, lower centering rollers, side rollers, guide rollers and spoke rollers; when in use, the wheel that has just been hot forged is placed in a set position by a mechanical arm, and then the main rollers, upper centering rollers and lower centering rollers are closed to clamp the tread of the wheel, and then the side rollers and guide rollers clamp the side of the wheel, the rounded table surface of the spoke roller contacts the inner edge surface of the wheel spoke, and then the rotation of the spoke roller drives the wheel to rotate through friction; the driving mode of the main rollers, upper centering rollers and lower centering rollers of the existing rolling mill is independent driving. Since the wheel is round, the control system needs to control the respective driving devices of the main rollers, upper centering rollers and lower centering rollers to act separately, and finally the wheel is clamped. It is necessary to ensure that the circumferential surfaces of the main rollers, upper centering rollers and lower centering rollers are all circumscribed with a virtual circle, so as to ensure effective clamping of the wheel.

[0004] In the above scheme, the spoke roller drives the wheel to rotate through friction. When the wheel is hot rolled, the tread of the wheel is a slightly irregular circle, resulting in the irregular depressions on the tread of the wheel not contacting the main roller, the upper centering roller or the lower centering roller, causing the wheel to rotate unsteadily during hot rolling, which can easily cause safety accidents. At the same time, three independent power devices need to be separately set up to drive the main roller, the upper centering roller and the lower centering roller respectively, which increases energy consumption and increases the manufacturing cost and operating cost of the equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a wheel hot rolling centering and expanding mechanism, which has the advantage of a power device driving the main rolling roller, the upper centering roller and the lower centering roller to close and open at the same time, and has the advantage of keeping the wheel rotation stable, effectively solving the problems of high energy consumption and unstable wheel rotation during the operation of the hot rolling mill in the prior art.

[0006] The present invention adopts the following technical scheme: a wheel hot rolling centering and expanding mechanism, comprising a main roller assembly slidably arranged in an installation groove of a machine body along the left-right direction and a centering roller assembly symmetrically arranged relative to the main roller assembly along the up-down direction, and the two centering roller assemblies are both hinged to the machine body; a driving part is arranged on the main roller assembly, and the driving part is used to simultaneously drive the left ends of the two centering roller assemblies to rotate when the main roller assembly moves to the right, thereby causing the right ends of the two centering roller assemblies and the right end of the main roller assembly to move inward synchronously, and in this process At any position, the right ends of the two centering roller assemblies and the right end of the main roller 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 end of the main roller assembly are always concentric; a main hydraulic telescopic rod is provided at the left end of the main roller assembly, and the main hydraulic telescopic rod is used to drive the main roller assembly to move left and right; two spoke roller assemblies are provided in the machine body, and the spoke roller assemblies are used to drive the wheel to rotate by rubbing the inner edge of the wheel, and at the same time, a retreat force is generated at the position where the spoke roller assembly contacts the inner edge of the wheel.

[0007] Furthermore, the centering roller assembly includes an articulated arm and a centering roller rotatably connected to the right end of the articulated arm, and the middle section of the articulated arm is hinged to the machine body; the main rolling roller assembly includes a driving rod, and a main rolling roller rotatably connected to the right end of the driving rod, the left end of the driving rod is fixedly arranged with the output end of the main hydraulic telescopic rod, the driving rod is located in the mounting groove of the machine body and is slidably arranged with the machine body along the left and right directions, the driving part includes a driving block fixedly arranged on the driving rod, the upper and lower parts of the right side surface of the driving block are provided with cam surfaces, and a follow-up mechanism is arranged on the articulated arm, and the follow-up mechanism is used to keep the left end of the articulated arm always in contact with the cam surface when the driving block moves left and right.

[0008] Furthermore, the follower mechanism includes two follower plates, the left end of each follower plate is hinged to the body, the middle part of each follower plate is provided with an arc hole along the left and right directions, and the right part of each follower plate is provided with an adaptation hole; the front side surface of each driving block is fixedly provided with a main pin column located in the corresponding arc hole, and the left part of the front side surface of each articulated arm is fixedly provided with a secondary pin column located in the corresponding adaptation hole.

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

[0010] Furthermore, the first compensation mechanism includes a shell fixedly arranged on the right end of the articulated arm, a centering roller is rotatably connected to the inside of the mounting block, a guide rod is fixedly arranged on the upper end surface of the mounting block, and the guide rod is penetrated into the shell along the up and down directions; a base plate is fixedly arranged on the guide rod located in the shell, a first compensation spring is sleeved on the guide rod located in the shell, the bottom end of the first compensation spring is fixedly arranged on the base plate, and a limiting ring is fixedly arranged in the shell above the base plate.

[0011] Furthermore, the main rolling roller is rotatably connected in the two clamping plates, the driving rod is slidably arranged in the two clamping plates along the left and right directions, the second compensation mechanism includes an upper end surface and a lower end surface of the driving rod, both of which are provided with sliders slidably arranged in the left and right directions, each slider is fixed to each clamping plate, a second compensation spring is fixedly arranged between the driving block and each slider, a limit block is fixedly arranged on the upper end surface and the lower end surface of the driving rod, a through hole is opened on the limit block, and the second compensation spring passes through the through hole of the limit block.

[0012] Furthermore, the front side and the rear side of the body are provided with accommodating holes, and the spoke roller assembly is located in the corresponding accommodating holes; the spoke roller assembly includes a cylinder, and the cylinder is rotatably connected to a rotating shaft, 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, and the main shaft is connected to the output end of the motor through a gear box, and the left and right ends of the cylinder are respectively fixed with a first bearing seat and a second bearing seat, and the rotating shaft is rotatably connected to the first bearing seat and the second bearing seat through roller bearings, the outer surface of the first bearing seat is hinged to the output end of the first hydraulic telescopic rod, and the outer surface of the second bearing seat is fixedly provided with a driving shaft, and the top end of the driving shaft is hinged to the output end of the second hydraulic telescopic rod through a transmission rod; the fixed ends of the first hydraulic telescopic rod and the second hydraulic telescopic rod are both hinged to the body, and the driving shaft is rotatably connected to the body.

[0013] Furthermore, the rotating shaft and the main shaft are both hollow structures, a tie rod is arranged in the cavity of the rotating shaft along the left and right directions, the left end of the tie rod is fixed to the spoke roller by a locking bolt, the spoke roller is slidingly arranged on the outer surface of the left end of the rotating shaft along the left and right directions, the right end of the main shaft is rotatably connected to a fixed tie rod cylinder, the tie rod cylinder, the motor and the gear box are fixed to each other; the gear box is placed in the accommodating hole, the tie rod cylinder, the motor and the gear box can all rotate around the drive shaft; the output shaft of the tie rod cylinder extends into the cavity of the main shaft and is connected to the right end of the tie rod Rotationally connected through a thrust bearing; the thrust bearing slidably arranged in the cavity of the rotating shaft along the left and right directions includes a left bearing disk and a right bearing disk, the right side surface of the right bearing disk is fixedly arranged on the output shaft of the tie rod cylinder, and the left side surface of the left bearing disk is in contact with the right end of the tie rod; a plurality of 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 on the tie rod located outside the retaining ring, the left end of the disc spring is in contact with the inner wall of the cavity of the rotating shaft, and the right end of the disc spring is in contact with the clamping nut through the retaining ring.

[0014] Furthermore, the left end of the output shaft of the tie rod cylinder is threadedly connected with a rear pull sleeve, which is fixed to the right side of the thrust bearing, and the left side of the thrust bearing is fixed with a front pull sleeve, which is arranged on the right end of the tie rod; a pin shaft is fixedly arranged on the left side of the front pull sleeve, and the pin shaft is adapted to a limiting groove provided on the outer surface of the clamping nut, and the front pull sleeve is slidably arranged left and right with the clamping nut through the cooperation of the pin shaft and the limiting groove.

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

[0016] 1. The present invention provides a main roller assembly, a centering roller assembly, a driving unit and a spoke roller assembly. When the device is used, the wheel is placed between the right ends of the two centering roller assemblies and the right end of the main roller assembly by a mechanical arm, and then the main roller assembly is driven to move rightward by a main hydraulic telescopic rod, so that the right end of the main roller assembly and the right ends of the two centering roller assemblies move inward synchronously to clamp the tread of the wheel, and then the spoke roller assembly rubs the inner edge of the wheel to drive the wheel to rotate, and at the same time, a retreat force is generated at the position where the spoke roller assembly contacts the inner edge of the wheel, which produces a radial expansion effect on the inner edge of the wheel; at the same time, the contact force between the tread of the wheel and the main roller is increased, thereby ensuring the stability of the wheel rotation.

[0017] 2. The present invention provides a centering roller, a guide rod, a base plate and a first compensation spring. When the device is used, if the tread of the wheel is a regular circle, when the centering roller and the main roller clamp the wheel, the centering roller is squeezed so that the mounting block, the guide rod and the base plate move upward until the upper end surface of the base plate contacts the lower end surface of the limiting ring, and the circumferential surface of the centering roller forms a rigid contact with the tread of the wheel; if the tread of the wheel is a slightly irregular circle, when the centering roller and the main roller clamp the wheel, if the circumferential surface of the centering roller just contacts the irregular depression of the wheel, the centering roller moves downward under the push of the first compensation spring until the circumferential surface of the centering roller contacts the tread of the wheel, and the circumferential surface of the centering roller forms a flexible contact with the tread of the wheel, effectively maintaining the smooth rotation of the wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the wheel in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the bearing seat in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the follower plate in the present invention; Figure 5 It is a front view structural schematic diagram of the follower plate in the present invention; Figure 6 It is a front view structural schematic diagram of the articulated arm in the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the driving rod in the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the main roller in the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure inside the shell of the present invention; Fig.10 It is a three-dimensional structural schematic diagram of the threaded column and the guide rod in the present invention in a separated state; Fig.11 It is a schematic diagram of the three-dimensional structure of the fixing block in the present invention; Fig.12 It is a three-dimensional structural schematic diagram of the slide rail and the mounting plate in the present invention in a separated state; Fig.13 It is a schematic diagram of the three-dimensional structure of the gear box in the present invention; Fig.14 It is a schematic diagram of the three-dimensional structure of the cylinder in the present invention; Fig.15 It is a schematic diagram of the internal structure of the cylinder in the present invention; Fig.16 It is a schematic diagram of the three-dimensional structure of the rotating shaft and the main shaft in the present invention; Fig.17 It is a schematic diagram of the internal structure of the rotating shaft and the main shaft in the present invention; Fig.18 For the present invention Fig.17 A schematic diagram of the structure enlargement at point A; Fig.19 It is a schematic diagram of the three-dimensional structure of the disc spring in the present invention; Fig. 20 For the present invention Fig.19 Schematic diagram of the enlarged structure at point B in FIG. DETAILED DESCRIPTION

[0019] See also Figure 1-20 The present invention is described in detail below with reference to the accompanying drawings and embodiments: The wheel hot rolling centering and expanding mechanism of the present invention comprises a main roller assembly 10 slidably arranged in the installation groove 2 of the machine body 1 along the left-right direction and a centering roller assembly 11 symmetrically arranged relative to the main roller assembly 10 along the up-down direction, and the two centering roller assemblies 11 are both hinged to the machine body 1; a driving part is arranged on the main roller assembly 10, and the driving part is used to simultaneously drive the left ends of the two centering roller assemblies 11 to rotate when the main roller assembly 10 moves to the right, so that the right ends of the two centering roller assemblies 11 and the right end of the main roller assembly 10 move inward synchronously, and in this process, the two centering roller assemblies at any position The right end of the component 11 and the right end of the main roller assembly 10 are always tangent to the circumferential surface of the corresponding virtual circle, and the right ends of the two centering roller assemblies 11 and the inscribed circles of the right end of the main roller assembly 10 are always concentric; the left end of the main roller assembly 10 is provided with a main hydraulic telescopic rod 12, and the main hydraulic telescopic rod 12 is used to drive the main roller assembly 10 to move left and right; two spoke plate roller assemblies are provided in the machine body 1, and the spoke plate roller assembly is 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 plate roller assembly contacts the inner edge of the wheel 7 generates a retreat force, which produces a radial expansion effect on the inner edge of the wheel 7.

[0020] When the main roller assembly 10 moves to the right, it drives the driving part to move to the right synchronously, so that the driving part synchronously drives the left ends of the two centering roller assemblies 11 to rotate, thereby making the right ends of the two centering roller assemblies 11 and the right end of the main roller assembly 10 move synchronously close to each other; the purpose of synchronously moving the right end of the main roller assembly 10 and the right ends of the two centering roller assemblies 11 inward is achieved; when in use, the wheel 7 that has just been hot forged is placed between the right ends of the two centering roller assemblies 11 and the right end of the main roller assembly 10 by the mechanical arm, and then the main roller 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 of the wheel 7. There is an inscribed circle 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, and the inscribed circles are concentric, which ensures that the tread of the wheel 7 is effectively clamped; then the wheel 7 is driven to rotate by the spoke roller assembly to perform hot rolling on the wheel 7; at the same time, the position where the spoke roller assembly contacts the inner edge of the wheel 7 generates a retreat force, which produces a radial expansion effect on the inner edge of the wheel 7.

[0021] In this embodiment, the centering roller assembly 11 includes an articulated arm 13 and a centering roller 14 rotatably connected to the right end of the articulated arm 13. The middle section of the articulated arm 13 is hinged to the machine body 1. The driving part moves to the right to drive the left end of the articulated arm 13 to cause the right end of the articulated arm 13 to rotate downward.

[0022] In this embodiment, the main roller assembly 10 includes a driving rod 15, and a main roller 16 rotatably connected to the right end of the driving rod 15, the left end of the driving rod 15 is fixedly arranged with the output end of the main hydraulic telescopic rod 12, the driving rod 15 is located in the mounting groove 2 of the machine body 1 and is slidably arranged with the machine body 1 along the left and right directions, the driving part includes a driving block 17 fixedly arranged on the driving rod 15, the upper and lower parts of the right side surface of the driving block 17 are provided with cam surfaces 18, and a follower mechanism is arranged on the articulated arm 13. The follower mechanism is used to keep the left end of the articulated arm 13 in contact with the cam surface 18 when the driving block 17 moves left and right; when the main hydraulic telescopic rod 12 pushes the driving rod 15 and the main roller 16 to move rightward, it also drives the driving block 17 to move rightward, and the driving block 17 drives the left end of the articulated arm 13 to rotate through the cam surface 18, so that the right ends of the two articulated arms 13 rotate close to each other, and then drive the two centering rollers 14 to rotate close to each other, so that the two centering rollers 14 and the main rollers 16 move rightward. The rollers 16 move inward synchronously, and at any position in this process, the circumferential surfaces of the two centering rollers 14 and the circumferential surfaces of the main rollers 16 are always tangent to the circumferential surfaces of the corresponding virtual circles, and the inscribed circles of the two centering rollers 14 and the main rollers 16 are always concentric; when the main hydraulic telescopic rod 12 drives the driving block 17 to move left, the driving block 17 drives the articulated arm 13 to rotate through the follower mechanism, so that the left end of the articulated arm 13 is always in contact with the cam surface 18, thereby making the right ends of the two articulated arms 13 The movable 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 simulation curve. When the driving block 17 moves left and right, the left end of the articulated arm 13 is always in contact with the cam surface 18 of the driving block 17. The cam surface 18 makes the moving position of the centering roller 14 at the right end of the articulated arm 13 always correspond to the moving position of the main roller 16, so that the circumferential surfaces of the two centering rollers 14 and the circumferential surface of the main roller 16 are tangent to a virtual circumferential surface.

[0023] 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, the middle part of each follower plate 19 is provided with an arc hole 20 along the left and right directions, and the right part of each follower plate 19 is provided with an adaptation hole 21; the front side surface of each driving block 17 is fixedly provided with a main pin column 22 located in the corresponding arc hole 20, and the left part of the front side surface of each articulated arm 13 is fixedly provided with a secondary pin column 23 located in the corresponding adaptation hole 21; when in use, when the driving block 17 moves to the right, the driving block 17 drives the left end of the articulated arm 13 to rotate through the cam surface 18, thereby causing the right end of the articulated arm 13 to move closer to each other, and at the same time, the driving block 17 drives the main pin column 22 to move straight to the right, and due to the relationship of the arc hole 20, the follower The right ends of the plates 19 move away from each other, so that the follower plate 19 moves 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, since the cam surface 18 of the drive block 17 is away from the left end of the articulated arm 13, the main pin 22 moves linearly to the left at this time. Due to the relationship of the arc hole 20, the main pin 22 drives the right ends of the follower plate 19 to move closer to each other, so that the right end of the follower plate 19 drives the left end of the articulated arm 13 to move closer to each other through the cooperation of the sub-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, and then the right end of the articulated arm 13 drives the centering rollers 14 to move away from each other, thereby achieving the purpose of opening the centering mechanism and facilitating the removal of the wheel 7.

[0024] The setting of the arc hole 20 and the adaptation hole 21 of the above-mentioned follower plate 19 must meet two conditions. When the driving block 17 moves to the right, the follower plate 19 follows the movement without interfering with the movement of the left end of the articulated arm 13; when the driving block 17 moves to the left, the follower plate 19 drives the left end 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.

[0025] In actual use, the tread of the wheel 7 that has just been hot-forged may be a slightly irregular circle. Since the circumferential surfaces of the main roller 16 and the two centering rollers 14 are always tangent to the circumferential surface of a virtual circle when moving inward, a certain centering roller 14 or the main roller 16 may not contact the tread of the wheel 7, which will cause the wheel 7 to rotate unsteadily. In order to solve this problem, in this embodiment, a first compensation mechanism is provided between the articulated arm 13 and the centering roller 14; a second compensation mechanism is provided between the driving rod 15 and the main roller 16; the first compensation mechanism is used to drive the centering roller 14 to move inward and contact the tread of the wheel 7 when the centering roller 14 is not in contact with the tread of the wheel 7 when clamping the wheel 7; the second compensation mechanism is used to drive the main roller 16 to move inward and contact the tread of the wheel 7 when the main roller 16 is not in contact with the tread of the wheel 7 when clamping the wheel 7, so as to ensure smooth rotation of the wheel 7.

[0026] In this embodiment, the front side and the rear side of the body 1 are both provided with accommodating holes 60, and the spoke roller assembly is located in the corresponding accommodating holes 60; the spoke roller assembly includes a cylinder 61, and the cylinder 61 is rotatably connected with a rotating shaft 62 inside, and a spoke roller 8 is arranged at the left end of the rotating shaft 62, and a main shaft 63 is fixedly arranged at the right end of the rotating shaft 62, and the main shaft 63 is connected to the output end of the motor 65 through a gear box 64, and the left and right ends of the cylinder 61 are respectively fixed with a first bearing seat 66 and a second bearing seat 67, and the rotating shaft 62 is rotatably connected to the first bearing seat 66 and the second bearing seat 67 through a roller bearing 68, and 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 driving shaft 70 is provided, and the top end of the driving 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 body 1, and the driving shaft 70 is rotatably connected to the body 1; when in use, the second hydraulic telescopic rod 71 is extended and retracted to drive the driving shaft 70 to rotate through the transmission rod 72, and then the transmission rod 72 drives the cylinder 61 to rotate through the second bearing seat 67, so that the cylinder 61 drives the rotating shaft 62, the spoke roller 8, the main shaft 63 and the motor 65 to rotate with the driving shaft 70 as the axis, so as to achieve the purpose of adjusting the contact angle between the spoke roller 8 and the wheel rim of the wheel 7; when the second hydraulic telescopic rod 71 is actuated, the first hydraulic telescopic rod 69 makes adaptive movement.

[0027] In this embodiment, the top end of the driving shaft 70 is fixedly disposed with the transmission rod 72 , and the outer end of the transmission rod 72 is hinged with the output end of the second hydraulic telescopic rod 71 .

[0028] When the wheel 7 rolling mill performs hot rolling on the wheel 7, the wheel 7 is in a vertical state, and the two spoke rollers 8 are respectively buckled into the inner edge of the side of the wheel 7 through the truncated cone body 84 on both sides of the wheel 7. The contact angle between the truncated cone body 84 of the spoke roller 8 and the rim of the wheel 7 can be adjusted by the first hydraulic telescopic rod 69 and the second hydraulic telescopic rod 71, and then the main shaft 63 is driven to rotate by the motor 65, and the main shaft 63 drives the spoke roller 8 to rotate through the rotating shaft 62. The spoke roller 8 drives the wheel 7 to rotate through the friction force with the wheel 7, so as to achieve the purpose of the spoke roller 8 driving the wheel 7 to rotate. On this basis, in order to achieve that the spoke roller 8 can be withdrawn relative to the wheel 7 along its own length direction, so that the truncated cone body 84 of the spoke roller 8 can contact the wheel 7 is to expand the rim of the wheel; in this embodiment, the rotating shaft 62 and the main shaft 63 are both hollow structures, and 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, and 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. The right end of the main shaft 63 is rotatably connected to a fixed pull rod cylinder 74, and the pull rod cylinder 74, the motor 65 and the gear box 64 are fixed to each other; the gear box 64 is placed in the accommodating hole 60, and the pull rod cylinder 74, the motor 65 and the gear box 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 through a thrust The bearing is rotatably connected; the thrust bearing slidably arranged in the cavity of the rotating shaft 62 along the left and right directions includes a left bearing plate 75 and a right bearing plate 76, the right side surface of the right bearing plate 76 is fixedly arranged with the output shaft of the tie rod cylinder 74, and the left side surface of the left bearing plate 75 abuts against the right end of the tie rod 73; a plurality of disc springs 77 are sleeved on the tie rod 73 located in the cavity of the rotating shaft 62, a retaining ring 78 is sleeved on the tie rod 73 located at the right end of the disc spring 77, and a clamping nut 79 is threadedly connected to the tie rod 73 located outside the retaining ring 78, the left end of the disc spring 77 abuts against the inner side 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 the retaining ring 78 and the clamping nut 79 The movable pull rod 73 moves to the right, so that the right end of the pull rod 73 conflicts with the left side of the left bearing plate 75; when in use, while the motor 65 drives the spoke roller 8 to rotate, the pull rod cylinder 74 contracts and drives the right bearing plate 76 to move to the right, thereby driving the left bearing plate 75 to move to the right, so that a gap is generated at the right end of the pull rod 73, and the pull rod 73 moves to the right under the push of the disc spring 77 and conflicts with the left side of the left bearing plate 76; the pull rod 73 moves to the right and drives the spoke roller 8 to move to the right at the same time, so that the frustum 84 of the spoke roller 8 expands the inner edge of the wheel 7; the left bearing plate 75 is sleeved in the transmission shaft 62; the right bearing plate 76 is fixed to the output shaft of the pull rod cylinder 74, and the right bearing plate 76 does not rotate.

[0029] When in use, the motor 65 drives the main shaft 63, the rotating shaft 62, the spoke roller 8 and the pull rod 73 to rotate in sequence, and the left bearing plate 75 of the thrust bearing rotates with the rotating shaft 62, while the pull rod cylinder 74, the output shaft of the pull rod cylinder 74 and the right bearing plate 76 remain stationary in the main shaft 63; the output shaft of the pull rod cylinder 74 contracts to the right, thereby driving the right bearing plate 76 to move to the right in the cavity of the rotating shaft 62, and a gap appears between the right end of the pull rod 73 and the left side of the left bearing plate 75. The spring 77 pushes the pull rod 73 to move to the right through the clamping nut 79, so that the right end of the pull rod 73 always keeps in close contact with the thrust bearing. The pull rod 73 moves to the right, driving the spoke roller 8 to move to the right, so that the frustum 84 of the spoke roller 8 expands the inner edge of the wheel 7 outward, and cooperates with the second compensation mechanism. When the tread of the wheel 7 is irregular in circle and the main roller 16 does not contact the tread of the wheel 7, the retreat force of the spoke roller 8 drives the wheel 7 to contact the main roller 16; the compensation of the second compensation mechanism is zero.

[0030] In this embodiment, the left end of the output shaft of the tie rod cylinder 74 is threadedly connected with a rear pull sleeve 80, and the rear pull sleeve 80 is fixedly set on the right side of the thrust bearing, and the left side of the thrust bearing is fixedly set with a front pull sleeve 81, and the front pull sleeve 81 is sleeved on the right end of the tie rod 73; when the tie 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, so that a gap is generated between the right end of the tie rod 73 and the front pull sleeve 81. At this time, the disc spring 77 pushes the tie 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 tie rod 73 always maintains close contact with the inner bottom wall of the front pull sleeve 81.

[0031] When the rolling mill performs hot rolling on the wheel 7, due to the harsh force on the spoke roller 8, the pull rod 73 is subjected to the combined action of torque, bending moment, shear stress and axial force, and the pull rod 73 is easy to break. In actual production, the pull rod 73 needs to be disassembled, repaired or replaced frequently. In order to facilitate the disassembly of the pull rod 73, in the present embodiment, a pin 82 is fixedly arranged on the left side of the front pull sleeve 81, and the pin 82 is adapted to the limiting groove 83 provided on the outer surface of the clamping nut 79. The front pull sleeve 81 is slidably arranged with the clamping nut 79 left and right through the cooperation of the pin 82 and the limiting groove 83; when the pull rod cylinder 74 drives the rear pull sleeve 80, the thrust bearing and the front pull sleeve 81 to move to the right through the output shaft of the pull rod cylinder 74, the front pull sleeve 81 drives the pin 82 to slide to the right in the limiting groove 83 of the clamping nut 79 but does not separate from the limiting groove 83 of the clamping nut 79. At this time, due to the pull rod 73 The locking nut 79 is then released to lock the locking nut 79, and the locking nut 79 is engaged with the locking nut 79 to release the locking nut 79, thereby locking the locking nut 79 in the locking position and the locking nut 79 being engaged with the locking nut 79.

[0032] In this embodiment, the angle position word is Fig.16The first compensation mechanism includes a shell 24 fixedly arranged at the right end of the articulated arm 13, the centering roller 14 is rotatably connected to the inside of the mounting block 25, and a guide rod 26 is fixedly arranged on the upper end surface of the mounting block 25, and the guide rod 26 is penetrated in the shell 24 along the up-down direction; a bottom plate 27 is fixedly arranged on the guide rod 26 located in the shell 24, and a first compensation spring 28 is sleeved on the guide rod 26 located in the shell 24, and the bottom end of the first compensation spring 28 is fixedly arranged with the bottom plate 27, and a limit ring 29 is fixedly arranged in the shell 24 above the bottom plate 27; the mounting block 25 and the right end surface of the articulated arm 13 are slidably arranged in the up-down direction; if the tread of the wheel 7 is a regular circle, when the centering roller 14 and the main rolling roller 16 clamp the wheel 7, the centering roller 14 is squeezed so that the mounting block 25, the guide rod 26 and the bottom plate 27 move upward until the upper end surface of the bottom plate 27 is aligned with the limit ring 29 The lower end surface of the centering roller 14 contacts with the tread of the wheel 7, and the circumferential surface of the centering roller 14 forms a rigid contact with the tread of the wheel 7; if the tread of the wheel 7 is a slightly irregular circle, when the centering roller 14 and the main roller 16 clamp the wheel 7, if the circumferential surface of the centering roller 14 just contacts with the irregular depression 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 with the tread of the wheel 7, and the circumferential surface of the centering roller 14 and the tread of the wheel 7 form a flexible contact, effectively maintaining the smooth rotation of the wheel 7; when the wheel 7 is hot-rolled and rotated, the irregular part of the wheel 7 transfers along the circumference, and the centering roller 14 and the main roller 16 will periodically make adaptive compensatory contact to ensure the smooth rotation of the wheel 7; if one of the centering rollers 14 contacts with the irregular protrusion of the wheel 7, the other centering roller 14 and the main roller 16 will make compensatory contact.

[0033] In this embodiment, the main roller 16 is rotatably connected in the two clamping plates 30, and the driving rod 15 is slidably arranged in the two clamping plates 30 along the left and right directions. The second compensation mechanism includes a slider 31 slidably arranged on the upper and lower end surfaces of the driving rod 15 along the left and right directions, and each slider 31 is fixedly arranged with each clamping plate 30. A second compensation spring 32 is fixedly arranged between the driving block 17 and each slider 31, and a limit block 33 is fixedly arranged on the upper and lower end surfaces of the driving 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 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 so that the main roller 16 slides to the left along the driving rod 15 through the clamping plate 30 until the slider 31 conflicts with the right side of the limit block 33, and the main roller 16 is pressed. The circumferential surface of the roller 16 forms a rigid contact with the tread of the wheel 7, effectively maintaining the smooth rotation of the wheel 7; if the tread of the wheel 7 is a slightly irregular circle, when the centering roller 14 and the main roller 16 clamp the wheel 7, if the circumferential surface of the main roller 16 just contacts the irregular depression of the wheel 7, the main roller 16 moves to the right under the push of the second compensation spring 32 until the circumferential surface of the main roller 16 contacts the tread of the wheel 7, and the circumferential surface of the main roller 16 forms a flexible contact with the tread of the wheel 7, effectively maintaining the smooth rotation of the wheel 7; when the wheel 7 is hot-rolled and rotated, the irregular part of the wheel 7 transfers along the circumference, and the centering roller 14 and the main roller 16 will periodically make adaptive compensatory contact to ensure the smooth rotation of the wheel 7; if one of the main rollers 16 contacts the irregular protrusion of the wheel 7, the other two centering rollers 14 make compensatory contact.

[0034] In order to achieve the purpose of adjusting the preload force of the first compensation spring 28 during use, in the present embodiment, an adjustment plate 35 is fixedly provided at the top end of the first compensation spring 28, and the adjustment plate 35 is slidably arranged in the shell 24 along the up and down directions. The upper end surface of the adjustment plate 35 is rotatably connected with a threaded column 36, and the outer surface of the threaded column 36 is threadedly connected to the shell 24; the guide rod 26 is both sleeved in the adjustment plate 35 and the threaded column 36; in use, if the elasticity of the first compensation spring 28 weakens, the threaded column 36 can be rotated to move downward along the shell 24, and then the threaded column 36 drives the adjustment plate 35 to move downward, thereby compressing the first compensation spring 28 to increase the preload force of the first compensation spring 28.

[0035] In this embodiment, a guide groove 37 is formed on the outer surface of the guide rod 26 in the up and down directions, and a guide block 38 adapted to the guide groove 37 is fixedly provided on the inner side wall of the adjustment plate 35. When the adjustment 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 adjustment plate 35.

[0036] In order to achieve the purpose of adjusting the preload force of the second compensation spring 32 during use, in the present embodiment, a buffer hole 39 is opened in the left-right direction at the position corresponding to the driving block 17 and the second compensation spring 32, and a push block 40 is slidably arranged in the left-right direction in the buffer hole 39 and fixed to the left end of the second compensation spring 32, and an adjusting bolt 41 is rotatably connected to the left side of the push block 40, and a cover plate 42 is threadedly connected to the outer surface of the adjusting bolt 41, and the cover plate 42 is fixed to the driving block 17; in use, if the elasticity of the second compensation 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, thereby compressing the second compensation spring 32 to increase the preload force of the second compensation spring 32.

[0037] In this embodiment, a first rotating shaft 43 is fixedly arranged in the upper articulated arm 13, and the parts of the first rotating shaft 43 located on both sides of the upper articulated arm 13 are rotatably connected to the first shaft sleeve 44, and each first shaft sleeve 44 is fixed to the body 1; the upper articulated arm 13 rotates in the first shaft sleeve 44 through the first rotating shaft 43.

[0038] In this embodiment, a second rotating shaft 45 is fixedly installed in the lower articulated arm 13, and both ends of the second rotating shaft 45 are rotatably connected to bearing seats 46, and each bearing seat 46 is fixed to the body 1; the lower articulated arm 13 rotates in the bearing seat 46 through the second rotating shaft 45.

[0039] In this embodiment, an L-frame 58 is fixedly provided on the front side of the machine body 1, and a detection camera 59 is fixedly provided on the L-frame 58 along the front-to-back direction; the centers of the inscribed circles of the main rolling roller 16 and the two centering rollers 14 are fixed; when the wheel 7 is hot-rolled, when the hot-rolling of the wheel 7 meets the requirements, the wheel 7 is detected by the detection camera 59, and the trajectory of the center of the wheel 7 during the rotation process is calculated. The trajectory of the center of the wheel 7 during the rotation process is an irregular figure around the centers of the inscribed circles of the main rolling roller 16 and the two centering rollers 14. The farthest distance between the irregular figure and the centers of the inscribed circles of the main rolling roller 16 and the two centering rollers 14 is calculated. If this distance is within the set range, it means that the tread of the wheel 7 is a circle that meets the requirements; if this distance exceeds the set range, it means that the circular irregularity of the tread of the wheel 7 exceeds the range, and hot rolling needs to be continued.

[0040] In this embodiment, the mounting block 25 includes a mounting plate 601 and two side plates 611 arranged on the lower end surface of the mounting plate 601, and the centering roller 14 is rotatably connected between the two side plates 611; the upper end surface of the mounting plate 601 is fixedly arranged with the shell 24; a connecting plate 621 is fixedly arranged between the two side plates 611, and an adjustment structure is arranged between the connecting plate 621 and the mounting plate 601, and 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.

[0041] In this embodiment, the adjustment mechanism includes a slide rail 631 fixedly arranged on the upper end surface of the connecting plate 621 along the front-to-back direction, a slide groove 641 adapted to the slide rail 631 is opened on the lower end surface of the mounting plate 601 along the front-to-back direction, and a fixing block 661 is fixedly arranged on the front and rear sides of the mounting plate 601 by two fixing bolts 651, and a top screw 671 and an adjusting bolt 681 are arranged on the fixing block 661, the top 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 top screw 671 contacts the end surface of the slide rail 631, and the adjusting bolt 681 is rotatably connected to the fixing block 661. The threaded hole on the end face of 631 is threadedly connected; when adjusting the front and rear position of the centering roller 14, first screw the top screw 671 so that the top screw 671 withdraws outward from the inside of the fixing block 661, thereby disengaging the head of the top screw 671 from the end face of the slide rail 631, and then rotate the adjusting bolt 681 to make the slide rail 631 move back and forth in the slide groove 641 of the mounting plate 601, and then make the slide rail 631 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 to better contact the tread of the wheel 7.

[0042] In order 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, the slide groove 641 is a right-angled trapezoidal structure, and a trapezoidal block 691 is fixedly arranged along the right-angled edge in the slide groove 641 in the front-to-back direction. 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 the vertical bolt 701; when disassembling, 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; when installing, first pass the two side plates 611 and the connecting plate 621 through the slide rail 6 31 is placed in the slide groove 641, and then the trapezoidal block 691 is installed and fixed in the slide groove 641 of the mounting plate 601 by the vertical bolt 701, that is, the installation of the centering roller 14 is realized, and then the fixing block 661 is fixed to the mounting plate 601 by the fixing bolt 651, and the top screw 671 is installed on the mounting plate 601. When installing the fixing block 661, it is necessary to first screw the adjusting bolt 681 into the threaded hole of the slide rail 631 so that the fixing block 661 can fit with the end face of the mounting plate 601, and then fix the fixing block 661; the head of the top screw 671 contacts the slide rail 631 to achieve the purpose of locking the slide rail 631; an avoidance groove 711 is opened on the side of the shell 24, and the nut of the vertical bolt 701 is located in the avoidance groove 711, which is convenient for disassembly and installation of the vertical bolt 701.

[0043] The working principle of the present invention is as follows: when in use, the mechanical arm clamps the calcined wheel 7 and places it between the two centering rollers 14 and the main roller 16. When the main hydraulic telescopic rod 12 pushes the driving rod 15 to move to the right, the driving block 17 is driven to move to the right. The driving block 17 drives the left end of the articulated arm 13 to rotate through the cam surface 18, so that the right end of the articulated arm 13 moves closer to each other; so that the two centering rollers 14 and the main roller 16 move inward to clamp the tread of the wheel 7, and then the motor 6 5 drives the spoke roller 8 to rotate, and the spoke roller 8 drives the wheel 7 to rotate, so as to perform hot rolling on the wheel. At the same time, the pull rod oil cylinder 74 contracts and drives the right bearing plate 76 to move rightward, thereby driving the left bearing plate 75 to move rightward, so that a gap is generated between the right end of the pull rod 73 and the right bearing plate 76. The pull rod 73 moves rightward under the push of the disc spring 77 and contacts the left side of the left bearing plate 76. The pull rod 73 moves rightward and drives the spoke roller 8 to move rightward at the same time, so as to achieve the purpose of the truncated cone body 84 of the spoke roller 8 expanding the inner edge of the wheel 7 outward.

Claims

1. A wheel hot rolling centering and expanding mechanism, characterized in that: The invention comprises a main roller assembly (10) slidably arranged in a mounting groove (2) of a machine body (1) in the left-right direction and a centering roller assembly (11) symmetrically arranged relative to the main roller assembly (10) in the up-down direction, wherein the two centering roller assemblies (11) are both hinged to the machine body (1); a driving unit is arranged on the main roller assembly (10), and the driving unit is used to simultaneously drive the left ends of the two centering roller assemblies (11) to rotate when the main roller assembly (10) moves to the right, thereby causing the right ends of the two centering roller assemblies (11) and the right end of the main roller assembly (10) to move inward synchronously, and the two centering roller assemblies at any position in this process The right end of the main roller assembly (11) and the right end of the main roller 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 roller assemblies (11) and the right end of the main roller assembly (10) are always concentric; the left end of the main roller assembly (10) is provided with a main hydraulic telescopic rod (12), and the main hydraulic telescopic rod (12) is used to drive the main roller assembly (10) to move left and right; two spoke roller assemblies are provided in the machine body (1), and the spoke roller assemblies 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 retreat force.

2. The wheel hot rolling centering and expanding mechanism according to claim 1, characterized in that: The centering roller assembly (11) comprises an articulated arm (13) and a centering roller (14) rotatably connected to the right end of the articulated arm (13), and the middle section of the articulated arm (13) is articulated to the machine body (1); the main roller assembly (10) comprises a driving rod (15) and a main roller (16) rotatably connected to the right end of the driving rod (15), the left end of the driving rod (15) is fixedly arranged with the output end of the main hydraulic telescopic rod (12), the driving rod (15) is located in the mounting groove (2) of the machine body (1) and is slidably arranged with the machine body (1) along the left and right directions, the driving part comprises a driving block (17) fixedly arranged on the driving rod (15), the upper and lower parts of the right side surface of the driving block (17) are both provided with cam surfaces (18), and a follower mechanism is arranged on the articulated arm (13), and the follower mechanism is used to keep the left end of the articulated arm (13) always in contact with the cam surface (18) when the driving block (17) moves left and right.

3. The wheel hot rolling centering and expanding mechanism according to claim 2, characterized in that: The follower mechanism comprises two follower plates (19), the left end of each follower plate (19) is hinged to the body (1), the middle part of each follower plate (19) is provided with an arc hole (20) in the left-right direction, and the right part of each follower plate (19) is provided with an adaption hole (21); the front side surface of each driving block (17) is fixedly provided with a main pin column (22) located in the corresponding arc hole (20), and the left part of the front side surface of each articulated arm (13) is fixedly provided with a secondary pin column (23) located in the corresponding adaption hole (21).

4. The wheel hot rolling centering and expanding mechanism 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 driving rod (15) and the main roller (16); the first compensation mechanism is used to drive the centering roller (14) to move inwards and contact the tread of the wheel (7) when the wheel (7) is clamped and the centering roller (14) is not in contact with the tread of the wheel (7); the second compensation mechanism is used to drive the main roller (16) to move inwards and contact the tread of the wheel (7) when the wheel (7) is clamped and the main roller (16) is not in contact with the tread of the wheel (7).

5. The wheel hot rolling centering and expanding mechanism according to claim 4, characterized in that: The first compensation mechanism comprises a housing (24) fixedly arranged at the right end of the hinged arm (13); the centering roller (14) is rotatably connected to the inside of the mounting block (25); a guide rod (26) is fixedly arranged on the upper end surface of the mounting block (25); the guide rod (26) is passed through the housing (24) in the up-down direction; a bottom plate (27) is fixedly arranged on the guide rod (26) located in the housing (24); a first compensation spring (28) is sleeved on the guide rod (26) located in the housing (24); the bottom end of the first compensation spring (28) is fixedly arranged on the bottom plate (27); and a limit ring (29) is fixedly arranged in the housing (24) above the bottom plate (27).

6. The wheel hot rolling centering and expanding mechanism according to claim 5, characterized in that: The main roller (16) is rotatably connected in the two clamping plates (30), the driving rod (15) is slidably arranged in the two clamping plates (30) along the left-right direction, the second compensation mechanism comprises a slider (31) slidably arranged on the upper end surface and the lower end surface of the driving rod (15) along the left-right direction, each slider (31) is fixedly arranged with each clamping plate (30), a second compensation spring (32) is fixedly arranged between the driving block (17) and each slider (31), and a limit block (33) is fixedly arranged on the upper end surface and the lower end surface of the driving 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).

7. The wheel hot rolling centering and expanding mechanism according to claim 6, characterized in that: The front side and the rear side of the machine body (1) are both provided with accommodating holes (60), and the spoke roller assembly is located in the corresponding accommodating holes (60); the spoke roller assembly comprises a cylinder (61), the cylinder (61) is rotatably connected to a rotating shaft (62), a spoke roller (8) is arranged at the left end of the rotating shaft (62), a main shaft (63) is fixedly arranged 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 gear box (64), a first bearing seat (66) and a second bearing seat (67) are fixedly arranged at the left and right ends of the cylinder (61), and the rotating shaft (62) is provided with a first bearing seat (66) and a second bearing seat (67) respectively. (62) is rotatably connected to the first bearing seat (66) and the second bearing seat (67) respectively through a roller bearing (68); the outer surface of the first bearing seat (66) is hinged to the output end of the first hydraulic telescopic rod (69); the outer surface of the second bearing seat (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), and the drive shaft (70) is rotatably connected to the machine body (1).

8. The wheel hot rolling centering and expanding mechanism according to claim 7, characterized in that: The rotating shaft (62) and the main shaft (63) are both hollow structures. A pull rod (73) is arranged in the hollow 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 fixed pull rod cylinder (74). The pull rod cylinder (74), the motor (65) and the gear box (64) are fixed to each other. The gear box (64) is placed in the accommodating hole (60). The pull rod cylinder (74), the motor (65) and the gear box (64) can all rotate around the drive shaft (70). The output shaft of the pull rod cylinder (74) extends into the hollow of the main shaft (63) and is connected to the right end of the pull rod (73) by a push rod. The thrust bearing is rotatably connected; the thrust bearing slidably arranged in the cavity of the rotating shaft (62) along the left and right directions comprises a left bearing plate (75) and a right bearing plate (76); the right side surface of the right bearing plate (76) is fixedly arranged with the output shaft of the tie rod oil cylinder (74); the left side surface of the left bearing plate (75) contacts with the right end of the tie rod (73); a plurality of disc springs (77) are sleeved on the tie rod (73) located in the cavity of the rotating shaft (62); a retaining ring (78) is sleeved on the tie rod (73) located at the right end of the disc spring (77); a clamping nut (79) is threadedly connected on the tie rod (73) located outside the retaining ring (78); the left end of the disc spring (77) contacts with the inner side wall of the cavity of the rotating shaft (62); and the right end of the disc spring (77) contacts with the clamping nut (79) through the retaining ring (78).

9. The wheel hot rolling centering and expanding mechanism according to claim 1, characterized in that: The left end of the output shaft of the tie rod oil cylinder (74) is threadedly connected with a rear pull sleeve (80), the rear pull sleeve (80) is fixedly arranged on the right side of the thrust bearing, the left side of the thrust bearing is fixedly arranged with a front pull sleeve (81), and the front pull sleeve (81) is sleeved on the right end of the tie rod (73); a pin shaft (82) is fixedly arranged on the left side of the front pull sleeve (81), the pin shaft (82) is matched with a limiting groove (83) provided on the outer surface of the clamping nut (79), and the front pull sleeve (81) is slidably arranged with the clamping nut (79) through the cooperation of the pin shaft (82) and the limiting groove (83).

10. The wheel hot rolling centering and expanding mechanism according to claim 1, characterized in that: An L-frame (58) is fixedly arranged on the front side of the machine body (1), and a detection camera (59) is fixedly arranged on the L-frame (58) along the front-to-back direction.

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