Calendering device for steel plate machining

Abstract

The invention relates to the technical field of steel plate processing machinery, and particularly discloses a steel plate processing calendering device which comprises a rack, an upper roller and a lower roller are arranged on the inner side of the rack, one end of the upper roller is in shaft connection with an upper roller driving motor, one end of the lower roller is in shaft connection with a lower roller driving motor, and the upper roller and the lower roller are used for calendering a steel plate. Supporting mechanisms are arranged on the two side walls of the machine frame, a steel plate enters the position between the upper roller and the lower roller, the steel plate is supported through the supporting mechanisms, the supporting mechanisms are connected with a material pressing mechanism, and the material pressing mechanism is used for supporting the steel plate and positioning the steel plate in the vertical direction. The material pressing mechanism is used for further supporting the steel plate and positioning the steel plate in the vertical direction, so that the steel plate enters the space between the upper roller and the lower roller more stably, the phenomenon that the steel plate is bent before and after rolling is avoided, the quality of the rolled steel plate is improved, secondary straightening is avoided, and then the machining cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel plate processing machinery, and in particular relates to a rolling device for steel plate processing. Background Art

[0002] Steel plate rolling is a metal processing technology, which is mainly used to plastically deform steel plates through a rolling mill to achieve the required thickness and surface quality. In the stainless steel industry, rolling usually refers to the process of making thick hot-rolled materials into thin cold-rolled materials after a series of processing techniques. We generally call the finished products after rolling "rolled materials". Rolling processing should refer to the processing of pressure and tensile ductility. Rolling processing actually refers to forging (forming in the solid state) processing, which can only forge steel and ultimately change the physical state of steel.

[0003] In the Chinese patent with publication number CN110871230B, a calendering device for steel plate processing is mentioned, which can increase the weight of the calendering roller to calender the steel plate, and can also unload the steel plate, and can also use a simple device to pull the calendering roller. The advantages solve the problem that the calendering process only relies on the weight of the calendering roller itself for calendering, the weight cannot be adjusted, and the calendering speed is affected. In addition, the calendered steel plate often needs to be unloaded manually. At the same time, the device often needs to be additionally equipped with a complex traction device, which is troublesome to maintain. However, during the calendering process, the steel plate is prone to bending and moving, resulting in a large deformation of the entire steel plate, affecting subsequent processing.

[0004] In a Chinese patent with publication number CN219664738U, a calendering device for steel plate processing is mentioned, which may have a pressure regulating function, can complete the pressure regulation, ensure the calendering speed, and improve the efficiency of steel plate calendering. It is highly practical, but requires manual power for feeding, resulting in lower processing safety, and the steel plate is easily displaced due to uneven force when moving, resulting in large deformation of the steel plate. Summary of the invention

[0005] The object of the present invention is to provide a rolling device for steel plate processing, so as to solve the problem in the prior art that the steel plate is easily bent and deformed greatly during rolling, which affects subsequent processing.

[0006] To achieve the above object, the present invention provides the following technical solution: a rolling device for steel plate processing, comprising a frame, an upper roller and a lower roller are arranged on the inner side of the frame, one end of the upper roller is connected to the upper roller drive motor, and one end of the lower roller is connected to the lower roller drive motor, and the upper roller and the lower roller are used to roll the steel plate;

[0007] Support mechanisms are provided on both side walls of the frame. The steel plate enters between the upper roller and the lower roller, and the steel plate is supported by the support mechanism. The support mechanism is connected to the pressing mechanism, and the pressing mechanism is used to support and position the steel plate in the vertical direction.

[0008] Preferably, the supporting mechanism comprises a bracket and a crossbeam, the crossbeam is mounted on the bracket, a movable frame is mounted on the crossbeam, and the movable frame is used to support the pressing mechanism.

[0009] Preferably, the pressing mechanism comprises an upper pressing roller and a lower pressing roller arranged in an upper and lower arrangement, and the upper pressing roller and the lower pressing roller cooperate with each other to press the steel plate.

[0010] Preferably: an upper pressing roller shaft is installed at the axis center of the upper pressing roller, and the upper pressing roller is rotatably connected to the upper pressing roller shaft through a bearing, both ends of the upper pressing roller shaft are rotatably connected to the upper pressing roller shaft bracket through bearings, and the upper pressing roller shaft bracket is slidably connected to the material pressing bracket.

[0011] Preferably, the upper pressing roller shaft bracket is threadedly connected to an adjusting rod, and the adjusting rod is rotatably connected to the material pressing bracket, and the height of the upper pressing roller shaft bracket can be adjusted by rotating the adjusting rod.

[0012] Preferably: a lower pressing roller shaft is installed at the axis center of the lower pressing roller, the lower pressing roller shaft is rotatably connected to the lower pressing roller shaft through a bearing, and the lower pressing roller shaft is rotatably connected to the material pressing bracket through the bearing.

[0013] Preferably: it also includes a limiting mechanism, the limiting mechanism includes a limiting bracket, the outer side wall of the limiting bracket is fixedly connected to the limiting bracket fixing rod, and the limiting bracket fixing rod and the limiting bracket are fixed to the pressing bracket through a nut.

[0014] Preferably: a support shaft is installed on the limit bracket, a rotating sleeve is mounted on the support shaft, the rotating sleeve is rotatably connected to the support shaft, the upper end of the rotating sleeve is fixedly connected to the rotating sleeve frame, an arc hole is opened on the rotating sleeve frame, a fastening knob is inserted in the arc hole, and the fastening knob passes through the limit bracket.

[0015] Preferably: a sleeve is welded on the side wall of the rotating sleeve, a movable rod is inserted into the sleeve, a limiting roller bracket is welded on the other end of the movable rod, a limiting roller is arranged inside the limiting roller bracket, and the limiting roller is rotatably connected to the limiting roller bracket through the limiting roller shaft.

[0016] Preferably, the outer wall of the limiting roller is provided with a plurality of limiting grooves, the limiting grooves are provided in a circular ring shape, the plurality of limiting grooves have different widths, and the plurality of limiting grooves are arranged along the axial direction of the limiting roller.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the pressing mechanism is used to further support and position the steel plate in the vertical direction, so that the steel plate enters between the upper roller and the lower roller more stably, avoiding bending of the steel plate before and after calendering, thereby improving the quality of the steel plate after calendering, avoiding secondary straightening, and reducing the processing cost.

[0019] 2. In the present invention, two limiting mechanisms are arranged on the pressing mechanism, and the two limiting mechanisms are located at the two ends of the pressing mechanism. The steel plate is limited in the horizontal direction by the limiting mechanisms, especially for the steel plate with thicker thickness, so as to avoid the horizontal displacement of the steel plate before and after rolling, causing the steel plate to produce larger irregular deformation, thereby improving the utilization rate of the steel plate and further improving the quality of the steel plate after rolling.

[0020] 3. In order to adapt to steel plates of different thicknesses, the height of the limiting roller needs to be adjusted in the present invention so that the limiting groove close to the thickness of the steel plate is clamped on the side wall of the steel plate. When the steel plate moves, the limiting roller rotates with the movement of the steel plate. The limiting roller limits the horizontal position of the steel plate to avoid horizontal displacement of the steel plate, thereby improving the utilization rate of the steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 One of the three-dimensional diagrams of the present invention;

[0022] Figure 2 This is the second stereogram of the present invention;

[0023] Figure 3 It is a right side view of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the supporting mechanism and the pressing mechanism in the present invention;

[0025] Figure 5 It is a left side view of the supporting mechanism and the pressing mechanism in the present invention;

[0026] Figure 6 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A in the middle.

[0027] In the figure: 1, frame; 2, upper roller; 3, upper roller drive motor; 4, upper roller bracket; 5, roller distance adjustment device; 6, lower roller; 7, lower roller drive motor; 8, lower roller bracket; 9, support mechanism; 91, bracket; 911, U-shaped hole; 92, crossbeam; 921, adjustment hole; 922, crossbeam mounting hole; 93, adjustment screw; 94, movable frame; 95, movable frame fixing piece; 10, pressing mechanism; 101, upper pressing roller; 102, lower pressing roller; 103, upper pressing roller shaft; 104, Lower pressure roller; 105, material pressing bracket; 1051, first adjustment hole; 1052, second adjustment hole; 106, upper pressure roller bracket; 107, adjustment rod; 11, limiting mechanism; 111, limiting bracket; 1111, limiting bracket fixing rod; 112, supporting shaft; 113, rotating sleeve; 1131, rotating sleeve frame; 1132, arc hole; 1133, tightening knob; 114, sleeve; 115, movable rod; 116, limiting roller bracket; 117, limiting roller; 1171, limiting groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Reference Figure 1-3 As shown in the figure, the present invention provides a rolling device for steel plate processing, including a frame 1, an upper roller 2 is arranged on the inner side of the frame 1, the upper roller 2 is installed on the frame 1 through an upper roller bracket 4, one end shaft of the upper roller 2 is connected to the upper roller driving motor 3, the upper roller bracket 4 is also connected to a roller gap adjustment device 5, the roller gap adjustment device 5 is installed on the top of the frame 1, the roller gap adjustment device 5 is a prior art and will not be described in detail here.

[0030] A lower roller 6 is also provided on the inner side of the frame 1. The lower roller 6 is located below the upper roller 2. The lower roller 6 is installed on the frame 1 through a lower roller bracket 8. One end of the lower roller 6 is connected to the lower roller drive motor 7. There is a gap between the upper roller 2 and the lower roller 6. The staff places the steel plate between the upper roller 2 and the lower roller 6. The upper roller drive motor 3 drives the upper roller 2 to rotate, and the lower roller drive motor 7 drives the lower roller 6 to rotate. The rotation directions of the upper roller 2 and the lower roller 6 are opposite. The steel plate is extruded by the upper roller 2 and the lower roller 6, and the thicker steel plate is rolled to form a steel plate of required thickness.

[0031] Support mechanisms 9 are provided on both side walls of the frame 1. When the steel plate enters between the upper roller 2 and the lower roller 6, the support mechanism 9 supports the steel plate, making the entry and rolling of the steel plate more stable. The support mechanism 9 can also play a protective role to prevent the staff from accidentally touching the upper roller 2 and the lower roller 6, thereby improving the safety of operation.

[0032] Furthermore, the supporting mechanism 9 is connected to the pressing mechanism 10, which is used to further support and vertically position the steel plate, so that the steel plate can enter between the upper roller 2 and the lower roller 6 more stably, avoiding bending of the steel plate before and after calendering, thereby improving the quality of the steel plate after calendering, avoiding secondary straightening, and reducing processing costs.

[0033] Furthermore, the pressing mechanism 10 is connected to a limiting mechanism 11. Two limiting mechanisms 11 are provided and are located at both ends of the pressing mechanism 10. The limiting mechanism 11 limits the horizontal position of the steel plate to avoid horizontal displacement of the steel plate before and after rolling, thereby preventing the steel plate from undergoing large irregular deformation, thereby improving the utilization rate of the steel plate and further improving the quality of the steel plate after rolling.

[0034] In a further embodiment, referring to Figure 4-Figure 5 As shown, the support mechanism 9 includes a bracket 91 . Two brackets 91 are provided. The two brackets 91 are fixed to the frame 1 by riveting, welding or bolting. A U-shaped hole 911 is opened in the middle of the bracket 91 .

[0035] It also includes a crossbeam 92, an adjustment hole 921 is opened in the middle of the crossbeam 92, and crossbeam mounting holes 922 are opened at both ends of the crossbeam 92. The crossbeam mounting holes 922 are connected to the adjusting screws 93, the adjusting screws 93 observe the U-shaped holes 911, and then the adjusting screws 93 and the crossbeam 92 are fixed to the bracket 91 through nuts, so as to facilitate the adjustment of the height of the crossbeam 92.

[0036] Furthermore, a movable frame 94 is installed on the crossbeam 92 . The movable frame 94 is C-shaped and can move along the length direction of the crossbeam 92 . The movable frame 94 is fixed to the crossbeam 92 via a movable frame fixing member 95 .

[0037] In this embodiment, the movable frame fixing member 95 adopts a bolt, which passes through the adjustment hole 921 and the through hole opened in the middle of the movable frame 94. The end diameter of the bolt is larger than the width of the adjustment hole 921. The bolt is tightened by the nut to fix the movable frame 94 to the beam 92. After unscrewing the nut, the movable frame 94 is pushed to move along the beam 92, and the distance between the two movable frames 94 can be adjusted, which can be adjusted according to steel plates of different widths.

[0038] In a further embodiment, referring to Figure 4-Figure 5The pressing mechanism 10 includes an upper pressing roller 101 and a lower pressing roller 102 which are arranged vertically. The upper pressing roller 101 and the lower pressing roller 102 cooperate with each other to squeeze the steel plate and limit the vertical direction of the steel plate to avoid upward bending of the two ends of the steel plate during the rolling process.

[0039] Furthermore, an upper pressing roller shaft 103 is installed at the axis center of the upper pressing roller 101, and the upper pressing roller 101 is rotatably connected to the upper pressing roller shaft 103 through a bearing, the length of the upper pressing roller shaft 103 is greater than the length of the upper pressing roller 101, and both ends of the upper pressing roller shaft 103 are rotatably connected to the upper pressing roller shaft bracket 106 through bearings, the upper pressing roller shaft bracket 106 is slidably connected to the pressing bracket 105, the upper pressing roller shaft bracket 106 is threadedly connected to the adjusting rod 107, and the adjusting rod 107 is rotatably connected to the pressing bracket 105, the lower end of the adjusting rod 107 is provided with an external thread, and the upper end of the upper pressing roller shaft bracket 106 is provided with a threaded hole, by rotating the adjusting rod 107, the height of the upper pressing roller shaft bracket 106 can be adjusted, and then the distance between the upper pressing roller 101 and the lower pressing roller 102 can be adjusted, which is suitable for rolling steel plates of different thicknesses.

[0040] Furthermore, the pressing bracket 105 is welded to the upper end of the movable frame 94, and a first adjustment hole 1051 is opened in the pressing bracket 105 corresponding to the upper pressing roller shaft bracket 106. A slide rail is arranged on the inner wall of the first adjustment hole 1051, and the upper pressing roller shaft bracket 106 can move up and down along the slide rail.

[0041] In this embodiment, both ends of the upper pressing roller 103 extend to the outside of the upper pressing roller bracket 106. When the movable frame 94 is adjusted to move along the beam 92, the distance between the two movable frames 94 can be adjusted, and then the distance between the two pressing brackets 105 can be adjusted. It can be adjusted according to steel plates of different widths, and is more practical.

[0042] Furthermore, a lower pressing roller shaft 104 is installed at the axis of the lower pressing roller 102, and the lower pressing roller shaft 104 is rotatably connected to the pressing bracket 105 through a bearing. The length of the lower pressing roller shaft 104 is greater than the length of the lower pressing roller 102, and the lower pressing roller shaft 104 is rotatably connected to the pressing bracket 105 through a bearing. Both ends of the lower pressing roller shaft 104 extend to the outside of the pressing bracket 105.

[0043] In this embodiment, when the movable frame 94 is adjusted to move along the crossbeam 92, the distance between the two movable frames 94 and the distance between the pressing brackets 105 are adjusted, and they can be adjusted according to steel plates of different widths, which is more practical.

[0044] Furthermore, a second adjustment hole 1052 is formed on the side wall of the pressing bracket 105. The second adjustment hole 1052 is used to install the limiting mechanism 11. The height of the limiting mechanism 11 can be adjusted conveniently through the second adjustment hole 1052. The height of the limiting mechanism 11 can be adjusted according to the thickness of the steel plate.

[0045] In a further embodiment, referring to Figure 5-Figure 6 As shown, the limiting mechanism 11 includes a limiting bracket 111, the outer wall of the limiting bracket 111 is fixedly connected to a limiting bracket fixing rod 1111, the limiting bracket fixing rod 1111 is inserted into the second adjustment hole 1052, and the outer wall of the limiting bracket fixing rod 1111 is provided with an external thread. The limiting bracket fixing rod 1111 is passed through the second adjustment hole 1052, and then the limiting bracket fixing rod 1111 and the limiting bracket 111 are fixed with a nut, so as to facilitate the adjustment of the height of the limiting bracket 111.

[0046] Furthermore, a support shaft 112 is installed on the limiting bracket 111, and a rotating sleeve 113 is mounted on the supporting shaft 112. The rotating sleeve 113 is rotatably connected to the supporting shaft 112. The upper end of the rotating sleeve 113 is fixedly connected to a rotating sleeve frame 1131. The rotating sleeve frame 1131 is semicircular and has an arc-shaped hole 1132. A tightening knob 1133 is inserted into the arc-shaped hole 1132, and the tightening knob 1133 passes through the limiting bracket 111.

[0047] In the embodiment, the tightening knob 1133 is unscrewed, the rotating sleeve 113 and the rotating sleeve frame 1131 are rotated, the rotating angle of the rotating sleeve 113 is adjusted, and then the tightening knob 1133 is tightened, so that the positions of the rotating sleeve 113 and the rotating sleeve frame 1131 can be fixed.

[0048] Furthermore, a sleeve 114 is welded to the side wall of the rotating sleeve 113, and a movable rod 115 is inserted into the sleeve 114. The movable rod 115 has multiple through holes, and a pin is installed on the sleeve 114. The movable rod 115 slides along the inner wall of the sleeve 114, and then the pin is inserted into different through holes to facilitate the adjustment of the total length of the sleeve 114 and the movable rod 115.

[0049] Furthermore, a limiting roller bracket 116 is welded to the other end of the movable rod 115, a limiting roller 117 is arranged on the inner side of the limiting roller bracket 116, the limiting roller 117 is rotatably connected to the limiting roller bracket 116 through a limiting roller shaft 118, a plurality of limiting grooves 1171 are opened on the outer wall of the limiting roller 117, the limiting grooves 1171 are arranged in a circular shape, the widths of the plurality of limiting grooves 1171 are different, and the plurality of limiting grooves 1171 are arranged axially along the limiting roller 117.

[0050] In this embodiment, in order to adapt to steel plates of different thicknesses, it is necessary to adjust the height of the limiting roller 117 so that the limiting groove 1171 that is close to the thickness of the steel plate is clamped on the side wall of the steel plate. When the steel plate moves, the limiting roller 117 rotates with the movement of the steel plate. The limiting roller 117 limits the horizontal position of the steel plate to avoid horizontal displacement of the steel plate, which causes a large deformation of the steel plate, thereby improving the utilization rate of the steel plate.

[0051] The working principle of the present invention is as follows: when in use, the distance between the upper pressing roller 101 and the lower pressing roller 102 is adjusted according to the initial thickness of the steel plate, and then the height of the limiting bracket 111 and the rotation angle of the rotating sleeve 113 are adjusted so that the outer wall of the limiting roller 117 fits the side wall of the steel plate. After the steel plate is positioned by the upper pressing roller 101 and the lower pressing roller 102, it enters between the upper roller 2 and the lower roller 6, and the distance between the upper roller 2 and the lower roller 6 is adjusted so that the steel plate passing between the upper roller 2 and the lower roller 6 reaches the required thickness. The upper roller drive motor 3 and the lower roller drive motor 7 are started to drive the upper roller 2 and the lower roller 6 to rotate in the opposite direction, and the steel plate is rolled by the upper roller 2 and the lower roller 6. At the same time, the steel plate is driven to move to the other side of the frame 1, and the pressing mechanism 10 and the limiting mechanism 11 on the other side of the frame 1 are adjusted so that the rolled steel plate can pass through the upper pressing roller 101 and the lower pressing roller 102 in the pressing mechanism 10, and the side wall of the steel plate fits the limiting roller 117 of the limiting mechanism 11. Three pressing points are formed by the two pressing mechanisms 10 and the upper roller 2 and the lower roller 6 on both sides of the frame 1, thereby preventing the steel plate from being deformed during the rolling process. The steel plate is limited in the horizontal direction by the two limiting mechanisms 11 on both sides of the frame 1, so as to avoid the steel plate from running off during the rolling process, resulting in a large overall deformation of the steel plate, thereby improving the rolling quality and utilization rate of the steel plate.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rolling device for processing steel plates, comprising a frame (1), an upper roller (2) and a lower roller (6) are arranged on the inner side of the frame (1), one end of the upper roller (2) is connected to the upper roller drive motor (3), and one end of the lower roller (6) is connected to the lower roller drive motor (7), and the upper roller (2) and the lower roller (6) are used to roll the steel plate, characterized in that: Support mechanisms (9) are provided on both side walls of the frame (1); the steel plate enters between the upper roller (2) and the lower roller (6), and the support mechanism (9) supports the steel plate; The support mechanism (9) is connected to a material pressing mechanism (10), and the material pressing mechanism (10) is used to support and position the steel plate in the vertical direction.

2. A rolling device for steel plate processing according to claim 1, characterized in that: The support mechanism (9) comprises a bracket (91) and a crossbeam (92), wherein the crossbeam (92) is mounted on the bracket (91), and a movable frame (94) is mounted on the crossbeam (92), wherein the movable frame (94) is used to support the material pressing mechanism (10).

3. A rolling device for steel plate processing according to claim 1, characterized in that: The pressing mechanism (10) comprises an upper pressing roller (101) and a lower pressing roller (102) arranged in an upper and lower arrangement, and the upper pressing roller (101) and the lower pressing roller (102) cooperate with each other to press the steel plate.

4. A rolling device for steel plate processing according to claim 3, characterized in that: An upper pressing roller shaft (103) is installed at the axis of the upper pressing roller (101), and the upper pressing roller (101) is rotatably connected to the upper pressing roller shaft (103) via a bearing, and both ends of the upper pressing roller shaft (103) are rotatably connected to an upper pressing roller shaft bracket (106) via bearings, and the upper pressing roller shaft bracket (106) is slidably connected to a material pressing bracket (105).

5. A rolling device for steel plate processing according to claim 4, characterized in that: The upper pressing roller support (106) is threadedly connected to an adjusting rod (107), and the adjusting rod (107) is rotatably connected to the material pressing support (105). By rotating the adjusting rod (107), the height of the upper pressing roller support (106) can be adjusted.

6. A rolling device for steel plate processing according to claim 5, characterized in that: A lower pressing roller shaft (104) is installed at the axis of the lower pressing roller (102), and the lower pressing roller shaft (104) is rotatably connected to the lower pressing roller shaft (104) through a bearing, and the lower pressing roller shaft (104) is rotatably connected to the material pressing bracket (105) through a bearing.

7. The rolling device for steel plate processing according to any one of claims 1 to 6, characterized in that: The device also comprises a limiting mechanism (11), wherein the limiting mechanism (11) comprises a limiting bracket (111), the outer side wall of the limiting bracket (111) is fixedly connected to a limiting bracket fixing rod (1111), and the limiting bracket fixing rod (1111) and the limiting bracket (111) are fixed to the material pressing bracket (105) by a nut.

8. A rolling device for steel plate processing according to claim 7, characterized in that: The limiting bracket (111) is provided with a support shaft (112), a rotating sleeve (113) is sleeved on the support shaft (112), the rotating sleeve (113) is rotatably connected to the support shaft (112), the upper end of the rotating sleeve (113) is fixedly connected to a rotating sleeve frame (1131), an arc-shaped hole (1132) is provided on the rotating sleeve frame (1131), a tightening knob (1133) is inserted into the arc-shaped hole (1132), and the tightening knob (1133) passes through the limiting bracket (111).

9. A rolling device for steel plate processing according to claim 8, characterized in that: A sleeve (114) is welded to the side wall of the rotating sleeve (113), a movable rod (115) is inserted into the sleeve (114), a limiting roller bracket (116) is welded to the other end of the movable rod (115), a limiting roller (117) is arranged inside the limiting roller bracket (116), and the limiting roller (117) is rotatably connected to the limiting roller bracket (116) via a limiting roller shaft (118).

10. A rolling device for steel plate processing according to claim 9, characterized in that: The outer wall of the limiting roller (117) is provided with a plurality of limiting grooves (1171), the limiting grooves (1171) are provided in a circular ring shape, the plurality of limiting grooves (1171) have different widths, and the plurality of limiting grooves (1171) are arranged axially along the limiting roller (117).

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