Coil tensioning device in transformer

Abstract

The utility model discloses a coil tensioning device in a transformer, which belongs to the technical field of coil winding and comprises a support and a moving device, the support is mounted on the moving device, and a swing device and a tensioning device are mounted on the support. The tensioning device comprises a guide rail assembly and a tensioning assembly, one end of the guide rail assembly is arranged on the support, the other end of the guide rail assembly is connected to one side of the tensioning assembly, and the tensioning assembly is installed on the swing device. By means of the mode, the tensioning assembly moves up and down along the guide rail assembly through the swing device and can synchronously change along with the far point and the near point of the oval coil, so that force borne by the oval coil is kept consistent when the oval coil is tensioned; through the arrangement of the moving device, the tensioning assembly can synchronously move along with winding wires on the oval coil, and the coil is evenly distributed in the winding process.

Description

Technical Field

[0001] The utility model relates to the technical field of coil winding, in particular to a coil tensioning device inside a transformer. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Its main components are coils and magnetic cores. Among them, the winding of the coils is a key factor in the performance of the transformer. Currently, the coils of transformers are usually wound with copper wires using an automatic winding machine.

[0003] For example, Chinese Patent CN112185688B discloses a tensioning device for coil winding. The tensioning device for coil winding includes a housing, at least a pair of pressing components, an adjusting component, and a copper wire flattening component. The pressing component includes a spring, a first mounting seat, a first shaft, and a cam; at least one pair of pressing components among the multiple pressing components is arranged in an opposing manner with the cams facing each other; the cam is provided with a first arc-shaped groove for passing the copper wire along its circumferential direction; at least two groups of the copper wire flattening components are respectively arranged on both sides of the pressing component, and the copper wire flattening components on one side are not in the same horizontal plane and have an included angle with each other. Through the above technical settings, the surface of the copper wire will not be damaged; at the same time, the copper wire can be tightened.

[0004] However, when winding an oval coil with this tensioning device for coil winding, the copper wire repeatedly moves at the far point and near point of the oval, resulting in inconsistent forces on the coil during tensioning, causing different tightness degrees in the entire coil winding. Moreover, it only winds at a fixed position on the coil and cannot move on the surface of the coil, which will make the distribution of the coil winding uneven.

[0005] Based on this, the utility model designs a coil tensioning device inside a transformer to solve the above problems. Summary of the Utility Model

[0006] In view of the above-mentioned drawbacks of the prior art, the utility model provides a coil tensioning device inside a transformer.

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions:

[0008] A coil tensioning device inside a transformer includes a bracket and a moving device. The bracket is installed on the moving device, and a swinging device and a tensioning device are installed on the bracket;

[0009] The tensioning device includes a guide rail component and a tensioning component. One end of the guide rail component is arranged on the bracket, and the other end is connected to one side of the tensioning component. The tensioning component is installed on the swinging device.

[0010] Furthermore, the mobile device includes a driving component and a linkage component. The driving component is connected to the linkage component. Both the bracket and the swinging device are connected to the linkage component. The driving component drives the bracket to move and the swinging device to rotate through the linkage component.

[0011] Furthermore, the driving component includes a motor, a bottom plate, a first gear, a limiting plate, a threaded rod, a slider and a sliding plate. The motor is fixedly installed at one end of the top of the bottom plate. There are two limiting plates, and the two limiting plates are fixedly installed on the bottom plate. The output end of the motor is fixedly connected to the first gear. The first gear is rotatably connected to the left side of the limiting plate close to the motor. The threaded rod is rotatably connected between the bottoms of the two limiting plates. One end of the threaded rod rotatably penetrates through the limiting plate close to the motor and is fixedly connected to the first gear. The slider is threadedly sleeved on the outer side of the threaded rod. The top of the slider is fixedly installed with a sliding plate. Both sides of the bottom of the sliding plate are fixedly provided with sliding grooves. Both sides of the top of the bottom plate are provided with guide rails, and the guide rails are inserted into the sliding grooves for sliding connection. The linkage component is installed between the tops of the two limiting plates. The top of the sliding plate is connected to the bottom of the bracket.

[0012] Furthermore, the linkage component includes a second gear, a spline rod and a spline shaft. The second gear is rotatably connected to the side of the limiting plate close to the motor. The second gear is located above the first gear and is meshed and connected to the first gear. The spline rod is rotatably connected between the tops of the two limiting plates. A spline shaft is slidably connected to the spline rod. One end of the spline rod rotatably penetrates through the limiting plate close to the motor and is fixedly connected to the second gear. The spline shaft is connected to the swinging device.

[0013] Furthermore, the swinging device includes a pulley assembly and a cam assembly. Both ends of the pulley assembly are respectively connected to the cam assembly and the spline shaft. The cam assembly is installed on the bracket and is connected to the tensioning component.

[0014] Furthermore, the pulley assembly includes a first pulley, a second pulley and a belt. The first pulley is fixedly installed on the outer side of the spline shaft. The second pulley is rotatably installed on the left side of the bracket. The second pulley is connected to the cam assembly. The first pulley and the second pulley are connected by belt drive.

[0015] Furthermore, the cam assembly includes a cam, a pulley, a pulley bracket, a sliding rod and a first spring. The cam is rotatably installed on the right side of the bracket. The shaft on the cam rotatably penetrates through the bracket and is fixedly connected to the second pulley coaxially. The pulley is rotatably installed inside the bottom of the pulley bracket. The pulley bracket is connected to the bottom of the tensioning component. The pulley is in rolling connection with the cam. The bottom of the sliding rod is connected to the top of the tensioning component. The top of the sliding rod passes through the through hole opened on the top of the bracket and is slidably connected to the bracket. One end of the first spring is fixedly connected to the bottom surface of the top of the bracket, and the other end of the first spring is connected to the top of the tensioning component. The first spring is sleeved on the outer side of the sliding rod.

[0016] Further, the guide rail assembly includes a sliding block and a slide rail. The sliding block is connected to one side of the tensioning assembly, and the slide rail is fixedly installed inside the right side of the bracket. The sliding block is slidably connected to the slide rail.

[0017] Further, the tensioning assembly includes a housing, a connecting rod, a second spring, an upper roller, an upper roller frame, a lower roller, and a lower roller frame. The housing is a C-shaped frame. The left side of the housing is fixedly connected to the sliding block. The slide rod and the first spring are both fixedly connected to the top of the housing. The bottom of the housing is fixedly connected to the top of the pulley frame. There are two connecting rods and two second springs. The top of each connecting rod slidably penetrates the inner top wall of the housing and extends to the outside. The upper roller frame is arranged inside the housing. The bottoms of the two connecting rods are fixedly connected to the outer top of the upper roller frame. The top end of the second spring is fixedly connected to the inner top wall of the housing, and the bottom end of the second spring is fixedly connected to the outer top of the upper roller frame. The second spring is sleeved outside the connecting rod. There are two upper rollers, and the two upper rollers are rotatably connected in parallel inside the upper roller frame. The lower roller frame is fixedly installed on the inner bottom wall of the housing, and the lower roller is rotatably installed inside the lower roller frame. The bottoms of the two baffles are respectively fixedly installed on both sides of the top of the lower roller frame, and the two baffles are located on both sides of the lower roller.

[0018] The utility model has the following technical effects:

[0019] 1. By means of the swinging device, the tensioning assembly of the utility model moves up and down along the guide rail assembly, and can synchronously change with the far point and near point of the elliptical coil, so that the force received when the elliptical coil is tightened remains consistent.

[0020] 2. Through the setting of the moving device, the tensioning assembly of the utility model can move synchronously with the winding on the elliptical coil, so that the coil distribution during winding is uniform. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a three-dimensional view of a coil tensioning device inside a transformer of the present utility model Figure 1 ;

[0023] Figure 2 is a front view of a coil tensioning device inside a transformer of the present utility model;

[0024] Figure 3Top view of a coil tensioning device inside a transformer according to the present utility model;

[0025] Figure 4 Stereo view of a coil tensioning device inside a transformer according to the present utility model Figure 2 ;

[0026] Figure 5 Is the cross-sectional view along the A-A direction of Figure 2 .

[0027] The reference numerals in the figure respectively represent:

[0028] 1. Bracket 2. Moving device 21. Driving component 211. Motor 212. Base plate 213. First gear 214. Limiting plate 215. Threaded rod 216. Slide block 217. Slide plate 22. Linkage component 221. Second gear 222. Spline rod 223. Spline shaft 3. Swing device 31. Pulley assembly 311. First pulley 312. Second pulley 313. Belt 32. Cam assembly 321. Cam 322. Pulley 323. Pulley bracket 324. Slide rod 325. First spring 4. Tensioning device 41. Guide rail assembly 411. Sliding block 412. Slide rail 42. Tensioning component 421. Housing 422. Connecting rod 423. Second spring 424. Upper roller 425. Upper roller bracket 426. Lower roller 427. Lower roller bracket 428. Baffle plate. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] The present utility model will be further described below with reference to the embodiments.

[0031] The "left", "right", "front", "rear", "upper" and "lower" mentioned in the following description are oriented in the perspective direction of the front view.

[0032] Embodiment 1

[0033] Please refer to the attached instruction manual Figures 1-5, A coil tensioning device inside a transformer, comprising a bracket 1 and a moving device 2. The bracket 1 is installed on the moving device 2, and a swinging device 3 and a tensioning device 4 are installed on the bracket 1; the tensioning device 4 includes a guide rail assembly 41 and a tensioning assembly 42. One end of the guide rail assembly 41 is arranged on the bracket 1, and the other end is connected to one side of the tensioning assembly 42. The tensioning assembly 42 is installed on the swinging device 3.

[0034] The moving device 2 includes a driving assembly 21 and a linkage assembly 22. The driving assembly 21 is connected to the linkage assembly 22. Both the bracket 1 and the swinging device 3 move back and forth with the linkage assembly 22. The driving assembly 21 drives the bracket 1 to move and the swinging device 3 to rotate through the linkage assembly 22.

[0035] The driving assembly 21 includes a motor 211, a bottom plate 212, a first gear 213, a limiting plate 214, a threaded rod 215, a slider 216 and a sliding plate 217. The motor 211 is fixedly installed at one end of the top of the bottom plate 212. There are two limiting plates 214. The limiting plate 214 at one end of the top is fixedly installed on the bottom plate 212. The output end of the motor 211 is fixedly connected to the first gear 213. The first gear 213 is rotatably connected to the left side of the limiting plate 214 close to the motor 211. The threaded rod 215 is rotatably connected between the bottoms of the two limiting plates 214. One end of the threaded rod 215 rotatably penetrates through the limiting plate close to the motor 211 and is fixedly connected to the first gear 213. The slider 216 is threadedly sleeved on the outer side of the threaded rod 215. A sliding plate 217 is fixedly installed on the top of the slider 216. Chute grooves are fixedly provided on both sides of the bottom of the sliding plate 217. Guide rails are provided on both sides of the top of the bottom plate 212. The guide rails are inserted into the chute grooves for sliding connection. The linkage assembly 22 is installed between the tops of the two limiting plates 214. The top of the sliding plate 217 is connected to the bottom of the bracket 1.

[0036] The linkage assembly 22 includes a second gear 221, a spline rod 222 and a spline shaft 223. The second gear 221 is rotatably connected to the left side of the limiting plate 214 close to the motor 211. The second gear 221 is located above the first gear 213 and is meshed and connected to the first gear 213. The spline rod 222 is rotatably connected between the tops of the two limiting plates 214. One end of the spline rod 222 rotatably penetrates through the limiting plate 214 close to the motor 211 and is fixedly connected to the second gear 221. A spline shaft 223 is slidably connected to the spline rod 222. The spline shaft 223 is connected to the swinging device 3. Among them, the spline rod 222 slidably penetrates through a through hole opened at the bottom of the bracket 1. The bottom of the bracket 1 is slidably sleeved on the outer side of the spline rod 222. One end of the spline shaft 223 is fixedly connected to the left side of the bottom of the bracket 1. When the bracket 1 moves, the spline shaft 223 can rotate and move on the spline rod 222 at the same time; moreover, the diameter of the through hole is larger than the outer diameter of the spline rod 222, so that the rotation of the spline rod 222 does not affect the movement of the bracket 1.

[0037] When the coil tensioning device in the transformer operates normally, the motor 211 drives the first gear 213 to rotate, and the first gear 213 drives the threaded rod 215 to rotate, so that the slider 216 moves along the threaded rod 215, and the slider 216 drives the slide plate 217 to move synchronously, thereby driving the bracket 1 to extend to the spline rod 222 to move.

[0038] The swing device 3 includes a pulley assembly 31 and a cam assembly 32 . Both ends of the pulley assembly 31 are connected to the cam assembly 32 and the spline shaft 223 , respectively. The cam assembly 32 is mounted on the bracket 1 and connected to the tensioning assembly 42 .

[0039] The pulley assembly 31 includes a first pulley 311, a second pulley 312 and a belt 313. The first pulley 311 is fixedly installed on the outside of the spline shaft 223, and the second pulley 312 is rotatably installed on the left side of the bracket 1. The second pulley 312 is connected to the cam assembly 32. The first pulley 311 and the second pulley 312 are connected through the belt 313.

[0040] The cam assembly 32 includes a cam 321, a pulley 322, a pulley frame 323, a slide rod 324 and a first spring 325. The cam 321 is rotatably installed on the right side of the bracket 1. The shaft on the cam 321 rotates and passes through the bracket 1 and is fixedly connected to the second pulley 312 coaxially. The pulley 322 is rotatably installed inside the bottom of the pulley frame 323. The pulley frame 323 is connected to the bottom of the tensioning assembly 42. The pulley 322 is rollingly connected to the cam 321. The bottom of the slide rod 324 is connected to the top of the tensioning assembly 42. The top of the slide rod 324 passes through the through hole opened at the top of the bracket 1 and is slidably connected to the bracket 1. One end of the first spring 325 is fixedly connected to the top bottom surface of the bracket 1, and the other end of the first spring 325 is connected to the top of the tensioning assembly 42. The first spring 325 is sleeved on the outside of the slide rod 324.

[0041] When the coil tensioning device in the transformer operates normally, the first gear 213 rotates to drive the second gear 221 to rotate, the second gear 221 drives the spline rod 222 to rotate, the spline rod 222 drives the spline shaft 223 to rotate, the spline shaft 223 drives the first pulley 311 to rotate, and the first pulley 311 moves with the bracket 1; the first pulley 311 drives the second pulley 312 to rotate through the belt 313, the second pulley 312 drives the cam 321 to rotate, and the pulley 322 rolls along the surface of the cam 321. When the far point of the cam 321 contacts the pulley 322, the pulley 322 drives the housing 421 to compress the first spring 325 upward, and the housing 421 drives the sliding block 411 to run along the slide rail 412. At this time, the coil also rotates to the farthest point, so that the force on the coil remains unchanged.

[0042] The guide rail assembly 41 includes a sliding block 411 and a slide rail 412. The sliding block 411 is connected to one side of the tensioning assembly 42. The slide rail 412 is fixedly installed inside the right side surface of the bracket 1, and the sliding block 411 is slidably connected to the slide rail 412.

[0043] The tensioning assembly 42 includes a housing 421, a connecting rod 422, a second spring 423, an upper roller 424, an upper roller frame 425, a lower roller 426, and a lower roller frame 427. The housing 421 is a C-shaped frame. The left side of the housing 421 is fixedly connected to the sliding block 411. The slide rod 324 and the first spring 325 are both fixedly connected to the top of the housing 421. The bottom of the housing 421 is fixedly connected to the top of the pulley frame 323. There are two connecting rods 422 and two second springs 423. The top of each connecting rod 422 slidably penetrates the inner top wall of the housing 421 and extends to the outside. The upper roller frame 425 and the lower roller frame 427 are both U-shaped structures and are symmetrically arranged. The upper roller frame 425 is arranged inside the housing 421. The bottoms of the two connecting rods 422 are both fixedly connected to the outer top of the upper roller frame 425. The top end of the second spring 423 is fixedly connected to the inner top wall of the housing 421, and the bottom end of the second spring 423 is fixedly connected to the outer top of the upper roller frame 425. The second spring 423 is sleeved outside the connecting rod 422. There are two upper rollers 424, and the two upper rollers 424 are rotatably connected in parallel inside the upper roller frame 425. The lower roller frame 427 is fixedly installed on the inner bottom wall of the housing 421, and the lower roller 426 is rotatably installed inside the lower roller frame 427. The bottoms of the two baffles 428 are respectively fixedly installed on both sides of the top of the lower roller frame 427, and the two baffles 428 are located on both sides of the lower roller 426. The tops of the two baffles 428 extend to the outside of the bottom of the upper roller 424 and do not touch. Among them, the bottom side part of the upper roller 424 extends to the outside of the bottom of the upper roller frame 425, and the top side part of the lower roller 426 extends to the outside of the top of the lower roller frame 427.

[0044] When the coil tensioning device in the transformer operates normally, when the copper wire is inserted between the upper roller 424 and the lower roller 426, the upper roller frame 425 compresses the second spring 423 upward; when the copper wire has passed through, the elastic force of the second spring 423 is used to push the upper roller frame 425 downward, so that the upper roller 424 and the lower roller 426 squeeze the copper wire, so that the copper wire is tightened under the action of the lateral extrusion force during winding. The setting of the two baffles 428 can limit the copper wire between the upper roller 424 and the lower roller 426 to prevent it from slipping out.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coil tensioning device in a transformer, comprising a bracket (1) and a moving device (2), characterized in that: The support (1) is mounted on the moving device (2), and a swing device (3) and a tensioning device (4) are mounted on the support (1); The tensioning device (4) comprises a guide rail assembly (41) and a tensioning assembly (42), one end of the guide rail assembly (41) is arranged on the bracket (1), and the other end is connected to one side of the tensioning assembly (42), and the tensioning assembly (42) is installed on the swing device (3); The swing device (3) comprises a pulley assembly (31) and a cam assembly (32), the two ends of the pulley assembly (31) are respectively connected to the cam assembly (32) and the moving device (2), and the cam assembly (32) is mounted on the bracket (1) and connected to the tensioning assembly (42).

2. The coil tensioning device in the transformer according to claim 1, characterized in that: The moving device (2) comprises a driving component (21) and a linkage component (22); the driving component (21) is connected to the linkage component (22); the bracket (1) and the swing device (3) both move back and forth with the linkage component (22); the driving component (21) drives the bracket (1) to move and the swing device (3) to rotate through the linkage component (22).

3. The coil tensioning device in the transformer according to claim 2, characterized in that: The driving assembly (21) comprises a motor (211), a bottom plate (212), a first gear (213), a limiting plate (214), a threaded rod (215), a slider (216) and a slide plate (217); the motor (211) is fixedly mounted on one end of the top of the bottom plate (212); two limiting plates (214) are provided, and the two limiting plates (214) are fixedly mounted on the bottom plate (212); an output end of the motor (211) is fixedly connected to the first gear (213); the first gear (213) is rotatably connected to the left side of the limiting plate (214) close to the motor (211); and the threaded rod (215) is rotatably mounted on the bottom plate (212). The first gear (213) is connected between the bottoms of the two limit plates (214), one end of the threaded rod (215) rotates to penetrate the limit plate near the motor (211) and is fixedly connected to the first gear (213), the slider (216) is threadedly sleeved on the outside of the threaded rod (215), a slide plate (217) is fixedly installed on the top of the slider (216), and slide grooves are fixedly provided on both sides of the bottom of the slide plate (217), and guide rails are provided on both sides of the top of the bottom plate (212), and the guide rails are inserted into the slide grooves for sliding connection, the linkage assembly (22) is installed between the tops of the two limit plates (214), and the top of the slide plate (217) is connected to the bottom of the bracket (1).

4. The coil tensioning device in the transformer according to claim 3, characterized in that: The linkage assembly (22) comprises a second gear (221), a spline rod (222) and a spline shaft (223); the second gear (221) is rotatably connected to the left side of a limit plate (214) close to the motor (211); the second gear (221) is located above the first gear (213) and meshes with the first gear (213); the spline rod (222) is rotatably connected between the tops of the two limit plates (214); the spline shaft (223) is slidably connected to the spline rod (222); one end of the spline rod (222) rotates through the limit plate (214) close to the motor (211) and is fixedly connected to the second gear (221); and the spline shaft (223) is connected to the swing device (3).

5. The coil tensioning device in the transformer according to claim 4, characterized in that: The two ends of the pulley assembly (31) are respectively connected to the cam assembly (32) and the spline shaft (223).

6. The coil tensioning device in the transformer according to claim 5, characterized in that: The pulley assembly (31) comprises a first pulley (311), a second pulley (312) and a belt (313); the first pulley (311) is fixedly mounted on the outside of the spline shaft (223); the second pulley (312) is rotatably mounted on the left side of the bracket (1); the second pulley (312) is connected to the cam assembly (32); and the first pulley (311) and the second pulley (312) are connected via a belt (313).

7. The coil tensioning device in the transformer according to claim 6, characterized in that: The cam assembly (32) comprises a cam (321), a pulley (322), a pulley frame (323), a slide rod (324) and a first spring (325); the cam (321) is rotatably mounted on the right side of the bracket (1); the shaft on the cam (321) rotates through the bracket (1) and is coaxially fixedly connected with the second pulley (312); the pulley (322) is rotatably mounted inside the bottom of the pulley frame (323); the pulley frame (323) and the bottom of the tensioning assembly (42) are connected. The pulley (322) is connected with the cam (321) in a rolling manner, the bottom of the slide rod (324) is connected with the top of the tensioning assembly (42), the top of the slide rod (324) passes through the through hole opened at the top of the bracket (1) and is slidably connected with the bracket (1), one end of the first spring (325) is fixedly connected with the top bottom surface of the bracket (1), the other end of the first spring (325) is connected with the top of the tensioning assembly (42), and the first spring (325) is sleeved on the outside of the slide rod (324).

8. The coil tensioning device in the transformer according to claim 7, characterized in that: The guide rail assembly (41) comprises a sliding block (411) and a sliding rail (412); the sliding block (411) is connected to one side of the tensioning assembly (42); the sliding rail (412) is fixedly installed inside the right side surface of the bracket (1); and the sliding block (411) is slidably connected to the sliding rail (412).

9. The coil tensioning device in the transformer according to claim 8, characterized in that: The tensioning assembly (42) comprises a shell (421), a connecting rod (422), a second spring (423), an upper roller (424), an upper roller frame (425), a lower roller (426) and a lower roller frame (427); the shell (421) is a C-shaped frame; the left side of the shell (421) is fixedly connected to the sliding block (411); the sliding rod (324) and the first spring (325) are fixedly connected to the top of the shell (421); the bottom of the shell (421) is fixedly connected to the top of the pulley frame (323); two connecting rods (422) and two second springs (423) are provided; the top of each connecting rod (422) slides through the inner top wall of the shell (421) and extends to the outside; the upper roller frame (425) is provided on the inner side of the shell (421); the two connecting rods (422) and the second spring (423) are provided The bottom of the second spring (422) is fixedly connected to the top outer side of the upper roller frame (425), the top of the second spring (423) is fixedly connected to the inner top wall of the shell (421), the bottom of the second spring (423) is fixedly connected to the top outer side of the upper roller frame (425), the second spring (423) is sleeved on the outer side of the connecting rod (422), two upper rollers (424) are provided, the two upper rollers (424) are rotatably connected in parallel to the inside of the upper roller frame (425), the lower roller frame (427) is fixedly installed on the inner bottom wall of the shell (421), the lower roller (426) is rotatably installed inside the lower roller frame (427), the bottoms of the two baffles (428) are respectively fixedly installed on both sides of the top of the lower roller frame (427), and the two baffles (428) are located on both sides of the lower roller (426).

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