Code recording device of cloth inspecting machine

Abstract

The invention relates to the technical field of code recording devices, and discloses a code recording device of a cloth inspecting machine, which mainly comprises at least two supporting shafts and device bodies, each supporting shaft is provided with a plurality of device bodies, and the device bodies are symmetrically and uniformly distributed by taking cloth to be subjected to code recording as a center. The supporting shafts are symmetrically distributed on the upper side and the lower side of the to-be-marked cloth with the to-be-marked cloth as the center. Each device body comprises a connecting base, a code recorder and a first friction wheel, the code recorder comprises a code recording linkage shaft, the first friction wheel is in linkage with the code recording linkage shaft, the connecting bases are located on the supporting shaft, and the code recorder is fixedly arranged on the connecting bases. By means of the technical scheme, the problem that in the prior art, cloth is prone to slipping when being rubbed with the friction wheel is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of code marking devices, in particular to a code marking device of a cloth inspection machine. Background Art

[0002] The coding device of a cloth inspection machine generally refers to a key component used to accurately measure and record the length of cloth. Its accuracy and stability will directly affect production efficiency and cost accounting.

[0003] At present, common coding devices usually include a first friction wheel and an electronic sensor, wherein the electronic sensor is used to detect the rotation angle of the first friction wheel. The first friction wheel is used to contact the surface of the fabric. During this process, the fabric is affected by work such as winding and is in a moving state. Therefore, the first friction wheel will be affected by the friction between it and the surface of the fabric and rotate, which is recorded by the electronic sensor and converted into fabric length according to its internal calculation formula and displayed on the display screen.

[0004] However, the existing coding device usually only has a first friction wheel on one side of the cloth, which may easily cause the cloth to slip during the friction with the first friction wheel, thereby affecting the coding accuracy. Summary of the Invention

[0005] The main purpose of the present invention is to provide a coding device for a cloth inspection machine, aiming to solve the problem in the related art that the cloth is prone to slipping when rubbing against the friction wheel.

[0006] To achieve the above object, the technical solution of the present invention is as follows: A coding device for a cloth inspection machine includes a support shaft and a device body. There are at least two support shafts, and each support shaft is provided with a number of device bodies. The device bodies are symmetrically and evenly distributed with the cloth to be coded as the center, and the support shafts are symmetrically distributed on the upper and lower sides of the cloth to be coded with the cloth to be coded as the center; each device body includes a connecting seat, a code marker, and a first friction wheel. The code marker includes a code marking linkage shaft, and the first friction wheel is linked to the code marking linkage shaft. The connecting seats are all located on the support shafts, and the code marker is fixedly set on the connecting seat.

[0007] Furthermore, a support frame is provided for supporting each support shaft, and a first moving mechanism is provided between the support frame and each support shaft for controlling each support shaft to move up and down. The support frames are symmetrically and evenly distributed with the support shaft as the center.

[0008] Furthermore, the first moving mechanism includes a driving screw, a first driving motor, a plurality of first connecting sliders, and a plurality of second connecting sliders. Each of the first connecting sliders and each of the second connecting sliders are respectively connected to the two ends of the support shaft, and are all slidingly connected to the support frame. The driving screw is a double-headed screw and is linked to the output shaft of the first driving motor. Each of the first connecting sliders is transmission-connected to the driving screw.

[0009] Furthermore, a second moving mechanism for controlling the connecting seat to rotate on the support shaft is provided between each of the first connecting sliders, each of the second connecting sliders and the connecting seat.

[0010] Furthermore, each of the second moving mechanisms includes a second drive motor, a drive gear, and a driven tooth surface. The end of each connecting seat away from the first friction wheel is an arc-shaped surface structure. The driven tooth surface is located at the end of the connecting seat away from the first friction wheel. The drive gear and the driven tooth surface are engaged with each other and linked to the output shaft of the second drive motor.

[0011] Furthermore, each of the first friction wheels is detachably connected to the code recording linkage shaft.

[0012] Furthermore, each of the coding linkage shafts is provided with a connecting platform, a first connecting hole is provided on the connecting platform, and each of the first friction wheels is provided with a mounting seat, the mounting seat is an annular structure, and a first matching hole is provided on the mounting seat. The first matching hole and the first connecting hole are coaxially arranged, and a first connecting member is provided between the two, and the first connecting member is threadedly connected to the first matching hole and the first connecting hole.

[0013] Furthermore, both ends of each of the first friction wheels are provided with a mounting seat.

[0014] Furthermore, each of the support shafts is provided with an auxiliary support plate, which is fixedly connected to the support shaft, and one end of each of the drive gears away from the second drive motor is rotatably connected to each auxiliary support plate.

[0015] Furthermore, a second friction wheel is provided between adjacent first friction wheels in the axial direction of the support shaft, and the second friction wheel is detachably connected between adjacent first friction wheels. The working principle and beneficial effects of the present invention are: The present invention mainly includes a support shaft and a device body, wherein there are at least two support shafts, each of which is located on the upper and lower sides of the fabric to be coded, and each support shaft is provided with a number of device bodies, and each device body is symmetrically and evenly distributed with the fabric to be coded as the center, and each device body mainly includes a connecting seat, a code recorder, and a first friction wheel. The code recorder itself includes a code record linkage shaft, and the first friction wheel is linked to the code record linkage shaft. In this way, when the first friction wheel rotates due to contact with the fabric, it will drive the code record linkage shaft to transmit together, so that the code recorder can record. The connecting seat is fixedly connected to the support shaft, and the code recorder itself is fixedly set on the connecting seat to ensure that the code recorder can stably perform the recording work.

[0016] In this way, there are friction wheels on the upper, lower, left and right sides of the fabric to be coded. With the cooperation of the friction wheels, the fabric is tensioned, thereby improving the contact between the fabric and the friction wheels, thereby preventing slipping between the fabric and the friction wheels, and helping to ensure the accuracy and stability of coding.

[0017] At the same time, since each first friction wheel is equipped with a coder, the values ​​displayed by each coder should be consistent under normal circumstances. The staff can visually check whether there is a coder failure by observing the values ​​displayed on each coder, which further improves the stability and accuracy of the coding results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of Example 1; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 This is a schematic structural diagram of Example 2; Figure 4 An exploded view of the first friction wheel and the encoder in Example 1 or Example 2; Figure 5 Schematic diagram of the connection between the support shaft and the first connecting slider and the second connecting slider in Example 1 or Example 2; Figure 6 Schematic diagram of the connection between the first friction wheel and the second friction wheel in Example 2; Figure 7 for Figure 6sectional view of Figure 8 This is a schematic structural diagram of the second friction wheel in Example 2.

[0020] Description of Figure Numbers: 1. Support shaft; 2. Device body; 21. Connecting seat; 22. Code recorder; 221. Code record linkage shaft; 2211. Connecting platform; 2212. First connecting hole; 23. First friction wheel; 231. Mounting seat; 232. First matching hole; 3. Support frame; 4. First moving mechanism; 41. Driving screw; 42. First driving motor; 43. First connecting slider; 44. Second connecting slider; 5. Second moving mechanism; 51. Second driving motor; 52. Driving gear; 53. Driven tooth surface; 6. First connecting member; 7. Auxiliary support plate; 8. Second friction wheel.

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] Example 1 like Figure 1 As shown, this embodiment proposes a code recording device for a cloth inspection machine, which mainly includes a support shaft 1 and a device body 2. Among them, there are at least two support shafts 1, and each support shaft 1 is symmetrically and evenly distributed on the upper and lower sides of the cloth to be recorded with the cloth to be recorded as the center. Each support shaft 1 is provided with a plurality of device bodies 2, and each device body 2 includes a connecting seat 21, a code recorder 22, and a first friction wheel 23. Among them, the code recorder 22 includes a code recording linkage shaft 221 and a machine body. The code recording linkage shaft 221 is rotatably connected to the machine body. The first friction wheel 23 is linked to the code recording linkage shaft 221. In this way, when the first friction wheel 23 rotates due to contact with the cloth, it can drive the code recording linkage shaft 221 to rotate together, so that the code recorder 22 records the rotation angle of the first friction wheel 23 and calculates the cloth length, completing the code recording work. The connecting base 21 is fixedly connected to the support shaft 1, and the code recorder 22 is fixedly arranged on the connecting base 21, that is, the connecting base 21 serves as a connecting component between the code recorder 22 and the support shaft 1, so that the code recorder 22 can stably complete the coding work.

[0024] At the same time, each device body 2 is symmetrically and evenly distributed with the cloth to be coded as the center, so as to ensure that there are first friction wheels 23 on both sides of the cloth to balance the force on the cloth, avoid unidirectional drift of the cloth, and ensure the stability of the coding work; and on the basis that there are support shafts 1 on the upper and lower sides of the cloth and each support shaft 1 has a number of device bodies 2, there are also first friction wheels 23 on the upper and lower sides of the cloth. The first friction wheels 23 located on the upper and lower sides of the cloth can play a role in tensioning the cloth by cooperating with each other, so as to improve the contact relationship between the cloth and the first friction wheels 23 to prevent slipping between the cloth and the first friction wheels 23, thereby effectively improving the stability and accuracy of the coding work.

[0025] Moreover, since the present embodiment has a redundant design for the coder 22 (each device body 2 includes a coder 22), and since the code linkage shaft 221 of each coder 22 is respectively linked with each first friction wheel 23, and each first friction wheel 23 is in contact with the fabric, therefore, under normal circumstances, after each first friction wheel 23 is affected by the fabric and rotates, the values ​​displayed on each coder 22 should be consistent. In this way, by comparing the values, the staff can intuitively find out whether there is a fault in the coder 22; when a single coder 22 is fixed, it does not affect the overall coding work of the present embodiment, and further improves the stability and accuracy of the coding work of the embodiment.

[0026] A support frame 3 is provided for supporting each support shaft 1. The support frame 3 is fixedly connected to the body of the external cloth inspection machine. Specifically, how the support frame 3 is fixedly connected to the body of the external cloth inspection machine should be determined by the specific model of the cloth inspection machine and will not be described in detail in this embodiment. A first moving mechanism 4 is provided between the support frame 3 and each support shaft 1 for controlling the up and down movement of each support shaft 1. That is, the presence of the support frame 3 reserves sufficient movement space for each support shaft 1 to adjust the spacing between the upper and lower adjacent first friction wheels 23, thereby making this embodiment adaptable to fabrics of various thicknesses and effectively increasing the scope of use of this embodiment. The support frames 3 are symmetrically and evenly distributed around the support shaft 1 to ensure that there are support points on both the left and right sides of each support shaft 1, effectively ensuring the stability of the overall structure of this embodiment.

[0027] Specifically, such as Figure 2 、 Figure 5As shown, the first moving mechanism 4 in this embodiment mainly includes a driving screw 41, a first driving motor 42, several first connecting sliders 43, and several second connecting sliders 44, wherein each first connecting slider 43 and each second connecting slider 44 are respectively fixedly connected to the two ends of the support shaft 1, and are all slidingly connected to the support frame 3, that is, each first connecting slider 43 and each second connecting slider 44 play the role of transferring the support frame 3 and each support shaft 1; the driving screw 41 is linked with the output shaft of the first driving motor 42, and the first driving motor 42 is fixedly arranged on the support frame 3 to ensure that the first driving motor 42 can stably provide driving force for the driving screw 41; the driving screw 41 is a double-headed screw, and each first connecting slider 43 is transmission-connected to the driving screw 41, that is, with the help of the structural characteristics of the double-headed screw, each first connecting slider 43 can move synchronously in opposite directions, thereby realizing rapid adjustment of the spacing between the upper and lower adjacent first friction wheels 23.

[0028] At the same time, a second moving mechanism 5 is provided between each first connecting slider 43, each second connecting slider 44 and the connecting seat 21 to control the rotation of the connecting seat 21 on the support shaft 1, that is, under the action of each second moving mechanism 5, each connecting seat 21 can rotate with the support shaft 1 as the center of the circle, thereby adjusting the distance between the upper and lower adjacent first friction wheels 23, thereby improving the flexibility of adjusting the distance between the first friction wheels 23 as a whole in this embodiment, and by moving a first friction wheel 23 alone, it can also play the role of adjusting the tensioning path, thereby changing and enhancing the tensioning effect of the fabric or adapting to the tensioning requirements of fabrics of different thickness specifications, thereby effectively improving the practicality of this embodiment.

[0029] Specifically, each second moving mechanism 5 includes a second drive motor 51, a drive gear 52, and a driven toothed surface 53. The driven toothed surface 53 is located at the end of the connecting base 21 away from the first friction wheel 23. The end of each connecting base 21 away from the first friction wheel 23 is an arcuate surface structure. That is, through the cooperation between each driven toothed surface 53 and each connecting base 21, the end of the connecting base 21 away from the first friction wheel 23 forms a broken gear structure. The drive gear 52 meshes with the driven toothed surface 53 and is linked to the output shaft of the second drive motor 51. That is, the second drive motor 51 controls the drive gear 52 to rotate, thereby driving each connecting base 21 to rotate about the support shaft 1. The gear meshing creates a self-locking effect, which fixes the position of the adjusted connecting base 21, thereby securing a first friction wheel 23 at a specific position and ensuring that it can stably rub against the fabric at that position. Each second driving motor 51 should be fixedly mounted on each first connecting slider 43 and each second connecting slider 44 , respectively, to ensure that each second driving motor 51 can stably drive each driving gear 52 .

[0030] Preferably, the first drive motor 42 and each second drive motor 51 in this embodiment are motors with self-locking properties such as stepping motors, so as to prevent the linkage parts affected by the first drive motor 42 or the second drive motor 51 from rotating uncontrollably, thereby destroying the overall operating structure of this embodiment (causing a component in this embodiment to deviate from its designated working position).

[0031] Each support shaft 1 is provided with an auxiliary support plate 7, which is fixedly connected to the support shaft 1. Preferably, a second matching hole is provided on the auxiliary support plate 7, and a second connecting hole is provided on the support shaft 1. The second connecting hole and the second matching hole are coaxially arranged, and a second connecting member is provided between the two. The second connecting member is threadedly connected to the second matching hole and the second connecting hole, that is, the fixed connection between the auxiliary support plate 7 and the support shaft 1 is achieved in a detachable manner so that the auxiliary support plate 7 can be replaced when it is damaged. The end of each drive gear 52 away from the second drive motor 51 is respectively rotatably connected to each auxiliary support plate 7. That is, with the presence of the auxiliary support plate 7, both ends of each drive gear 52 have support points for supporting itself, effectively ensuring the stability of the rotation of each drive gear 52.

[0032] Preferably, the auxiliary support plate 7 should also be in contact with the connecting seat 21, thereby constraining the connecting seat 21. Correspondingly, each support shaft 1 should also be provided with a limiting ring, each of which is located at one end of the connecting seat 21 away from the auxiliary support plate 7, and then cooperates with the auxiliary support plate 7 to limit the position of the connecting seat 21, thereby preventing the connecting seat 21 from moving on the support shaft 1, and effectively ensuring the stability of the overall structure of this embodiment.

[0033] like Figure 2 、 Figure 4 As shown, each first friction wheel 23 will wear out due to contact with the fabric, and once worn, it will be difficult for the first friction wheel 23 to maintain good contact with the fabric, thereby affecting the metering results of the code recorder 22. Therefore, each first friction wheel 23 is detachably connected to the code recorder linkage shaft 221, so that when the first friction wheel 23 becomes worn, it can be replaced to ensure a good and accurate correlation between the code recorder 22 and the fabric.

[0034] Correspondingly, each code-recording linkage shaft 221 is provided with a connecting platform 2211, and each first friction wheel 23 is provided with a mounting seat 231. The mounting seat 231 is a ring structure, and each first friction wheel 23 is provided with a mounting port. The mounting port is coaxially arranged with the inner ring of the mounting seat 231, and the projection surfaces of the two in the axial direction of the support shaft 1 coincide with each other, that is, each first friction wheel 23 can be plugged into and matched with the hole shaft of the code-recording linkage shaft 221. At the same time, a first connecting hole 2212 is provided on the connecting platform 2211, and a first matching hole 232 is provided on the mounting seat 231. The first matching hole 232 and the first connecting hole 2212 are coaxially arranged, and a first connecting member 6 is provided between the two. The first connecting member 6 is threadedly connected to the first matching hole 232 and the first connecting hole 2212. In this way, the first friction wheel 23 is fixedly set on the code recording linkage shaft 221; the connection between the first friction wheel 23 and the code recording linkage shaft 221 is realized by a threaded connection of the external first connecting member 6, which not only ensures the connection reliability between the two, but also ensures the convenience of disassembly and assembly between the first friction wheel 23 itself and the code recording linkage shaft 221.

[0035] Furthermore, when the axial projection of the code register linkage shaft 221 is aligned with the axial projection of the inner ring of the mounting seat 231, the first friction wheel 23 cannot rotate about the code register linkage shaft 221 while in contact with the code register linkage shaft 221; its rotation is accompanied by the rotation of the code register linkage shaft 221. This allows for quick identification of the first friction wheel 23 after insertion onto the code register linkage shaft 221 (enabling rapid alignment of the first mating hole 232 with the first connecting hole 2212), further improving the efficiency of replacing the first friction wheel 23.

[0036] Both ends of each first friction wheel 23 are provided with a mounting seat 231, that is, there are force points on both sides of each first friction wheel 23, so as to evenly disperse the force on the first friction wheel 23 and avoid deformation of the first friction wheel 23 and the code linkage shaft 221.

[0037] Example 2 On the basis of Example 1, Figure 3 、 Figures 6-8 As shown, this embodiment proposes that: a second friction wheel 8 is provided between each adjacent first friction wheel 23 in the axial direction of the support shaft 1, and each second friction wheel 8 is linked with the corresponding first friction wheel 23, so that when the width of the cloth is smaller than the spacing between the left and right adjacent first friction wheels 23, it can also drive each first friction wheel 23 and the coding linkage shaft 221 to rotate, so that this embodiment can adapt to cloths of various widths. Compared with Example 1, the scope of use is fully improved and expanded.

[0038] At the same time, the second friction wheel 8 is detachably connected between adjacent first friction wheels 23 , similar to the first friction wheel 23 , so that the second friction wheel 8 can be replaced when damaged to ensure good contact between it and the fabric.

[0039] Specifically, each second friction wheel 8 is provided with a plurality of third connecting holes, and each first friction wheel 23 is provided with a third matching hole. Each third matching hole is coaxially arranged with each third connecting hole, and a linkage shaft is provided between the two. Each linkage shaft is matched with the third matching hole and the third connecting hole shaft one by one at the same time. Through the hole-shaft matching, the second friction wheel 8 can drive the first friction wheel 23 to rotate during the rotation process, thereby triggering the code recording linkage shaft 221.

[0040] Each linkage shaft should be provided with a fixing hole, and each fixing hole should be provided with a third connecting piece, which is threadedly connected to the fixing hole, and each third connecting piece is preferably a bolt with a nut; the longitudinal section of the second friction wheel 8 is preferably an "H"-shaped structure, that is, an annular groove is provided on the second friction wheel 8 to reserve operating space for the staff, the fixing hole is located on the end face of the linkage shaft, and the end face of the linkage shaft with the fixing hole is flush with the inner wall of the second friction wheel 8. In this way, through the abutment relationship between the nut part of the third connecting piece and the inner wall of the second friction wheel 8, the second friction wheel 8 and each linkage shaft can be fixed without contacting the third connecting piece with the fabric, effectively avoiding the presence of the third connecting piece to scratch the fabric; and the "H"-shaped structure has good bending and torsional rigidity, which can effectively ensure the strength of the second friction wheel 8 itself.

[0041] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A code marking device for a cloth inspection machine, comprising a support shaft (1) and a device body (2), characterized in that: At least two support shafts (1) are provided, and a plurality of device bodies (2) are provided on each support shaft (1), and each device body (2) is symmetrically and evenly distributed with the fabric to be coded as the center, and each support shaft (1) is symmetrically distributed on the upper and lower sides of the fabric to be coded as the center; Each of the device bodies (2) comprises a connecting seat (21), a code recorder (22), and a first friction wheel (23); the code recorder (22) comprises a code record linkage shaft (221); the first friction wheel (23) is linked to the code record linkage shaft (221); the connecting seat (21) is located on the support shaft (1); and the code recorder (22) is fixedly arranged on the connecting seat (21).

2. The code marking device of the cloth inspection machine according to claim 1, characterized in that: A support frame (3) is provided for supporting each support shaft (1), and a first moving mechanism (4) is provided between the support frame (3) and each support shaft (1) for controlling each support shaft (1) to move up and down. The support frames (3) are symmetrically and evenly distributed with the support shaft (1) as the center.

3. The code marking device of the cloth inspection machine according to claim 2, characterized in that: The first moving mechanism (4) includes a driving screw (41), a first driving motor (42), a plurality of first connecting sliders (43), and a plurality of second connecting sliders (44). Each of the first connecting sliders (43) and each of the second connecting sliders (44) are respectively connected to the two ends of the support shaft (1) and are both slidably connected to the support frame (3). The driving screw (41) is a double-headed screw and is linked to the output shaft of the first driving motor (42). Each of the first connecting sliders (43) is transmission-connected to the driving screw (41).

4. The code marking device of the cloth inspection machine according to claim 3, characterized in that: A second moving mechanism (5) for controlling the connection seat (21) to rotate on the support shaft (1) is provided between each of the first connection sliders (43), each of the second connection sliders (44) and the connection seat (21).

5. The code marking device of the cloth inspection machine according to claim 4, characterized in that: Each of the second moving mechanisms (5) includes a second drive motor (51), a drive gear (52), and a driven toothed surface (53). The end of each of the connecting seats (21) away from the first friction wheel (23) is an arcuate surface structure. The driven toothed surface (53) is located at the end of the connecting seat (21) away from the first friction wheel (23). The drive gear (52) and the driven toothed surface (53) are meshed with each other and are linked to the output shaft of the second drive motor (51).

6. The code marking device of the cloth inspection machine according to any one of claims 1 to 5, characterized in that: Each of the first friction wheels (23) is detachably connected to the code recording linkage shaft (221).

7. The code marking device of the cloth inspection machine according to claim 6, characterized in that: Each of the code-marking linkage shafts (221) is provided with a connecting platform (2211), and a first connecting hole (2212) is provided on the connecting platform (2211). Each of the first friction wheels (23) is provided with a mounting seat (231), and the mounting seat (231) is an annular structure. A first matching hole (232) is provided on the mounting seat (231). The first matching hole (232) and the first connecting hole (2212) are coaxially arranged, and a first connecting member (6) is provided therebetween. The first connecting member (6) is threadedly connected to the first matching hole (232) and the first connecting hole (2212).

8. The code marking device of the cloth inspection machine according to claim 7, characterized in that: Both ends of each of the first friction wheels (23) are provided with mounting seats (231).

9. The code marking device of the cloth inspection machine according to claim 5, characterized in that: Each support shaft (1) is provided with an auxiliary support plate (7), the auxiliary support plate (7) is fixedly connected to the support shaft (1), and one end of each drive gear (52) away from the second drive motor (51) is rotatably connected to each auxiliary support plate (7).

10. The code marking device of the cloth inspection machine according to claim 6, characterized in that: A second friction wheel (8) is provided between adjacent first friction wheels (23) in the axial direction of the support shaft (1), and the second friction wheel (8) is detachably connected between adjacent first friction wheels (23).

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