Steel belt wheel assembly

Abstract

The utility model relates to the technical field of elevators, in particular to a steel belt wheel assembly. The steel belt wheel assembly comprises a support, a steel belt wheel and a cleaning assembly. The steel belt wheel comprises a wheel shaft and a wheel body, the wheel shaft is connected with the support, the wheel body is rotationally connected with the wheel shaft and can rotate around the axis of the wheel shaft, and the peripheral side of the wheel body makes contact with a steel belt. The cleaning assembly comprises a brush and a connecting unit, the connecting unit is connected with the wheel shaft, the brush is fixed to the connecting unit, and at least part of the brush extends into the moving track of the steel belt. The steel belt cleaning device has the advantages that the brush extends into the running track of the steel belt, so that the steel belt is always propped against and cleaned by the brush in the running process, and sundries and dust on the steel belt are cleaned by the brush, so that the situation that the steel belt wheel and the steel belt are damaged and the service lives of the steel belt wheel and the steel belt are influenced due to the fact that dirt is difficult to clean after long-time running is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a steel belt wheel assembly. Background Art

[0002] With the improvement of people's living standards, more and more families begin to install household elevators. Most household elevators on the market use steel ropes as traction. However, for the sake of safety, comfort and maintenance, at present, the trend of using flat steel belts as traction components to replace the existing steel rope traction scheme has increasingly become the industry norm.

[0003] However, when an elevator using a steel belt as a traction system runs for a long time, impurities in the hoistway are likely to enter between the steel belt and the steel belt wheel. In the long run, this will not only cause wear of the steel belt and the steel belt wheel, but also increase the running noise of the elevator, thereby affecting the safety and user experience of use. Moreover, when the steel belt wheel needs to be replaced due to wear, since the assembly design of the steel belt wheel is complex and the wheel shaft structure carrying the steel belt wheel is difficult to replace and maintain, once dirt accumulates between the steel belt wheel and the steel belt, the cleaning cost and maintenance cost are relatively high. Summary of the Utility Model

[0004] Based on this, in view of the above technical problems, the utility model provides a steel belt wheel assembly.

[0005] A steel belt wheel assembly includes: a bracket; a steel belt wheel, including a wheel shaft and a wheel body, the wheel shaft is fixedly supported and connected to the bracket, the wheel body is rotatably connected to the wheel shaft, the wheel body can rotate around the axis of the wheel shaft, and a steel belt is in contact with the outer peripheral side of the wheel body; a cleaning assembly, including a brush and a connecting unit, the connecting unit is connected to the wheel shaft, the brush is fixed to the connecting unit, and at least part of the brush extends into the running track of the steel belt.

[0006] With such a setting, since the wheel shaft is fixed on the bracket, it can keep the relative position fixed like the bracket. And the brush is fixed on the wheel shaft through the connecting unit, so its position is also relatively fixed. The wheel shaft supports the rotation of the wheel body, the wheel body is connected to the steel belt and can drive the steel belt to rotate. Since the brush extends into the running track of the steel belt, the steel belt is always abutted and cleaned by the brush during operation. The brush cleans the sundries and dust on the steel belt to prevent dirt from being difficult to clean after long-term operation, which may cause damage to the steel belt wheel and the steel belt and affect their service lives.

[0007] In one embodiment, the steel belt includes a connecting section connected to the wheel body and a transmission section separated from the wheel body. The brush is spaced from the outer peripheral wall of the wheel body in the radial direction of the wheel body, and the brush is perpendicular to the transmission section.

[0008] In one embodiment, there are two brushes, which extend in opposite directions, and the distance between the two ends of the two brushes that are away from each other is greater than the diameter of the wheel body.

[0009] In one embodiment, the connecting unit includes a clamping plate and a clamping seat. A clamping groove is formed on the wheel shaft. The clamping plate includes a clamping section and an extending section. The clamping section is clamped in the clamping groove and extends along the radial direction of the wheel shaft. The extending section is connected to the clamping section and is arranged at a specific angle. The extending section extends along the axial direction of the wheel shaft and is spaced from the outer peripheral side of the wheel body.

[0010] The clamping seat is connected to the extending section, and the brush is connected to the clamping seat.

[0011] In one embodiment, mounting grooves are provided on both sides in the width direction of the clamping seat, and the openings of the two mounting grooves are arranged in opposite directions. The brush is arranged in the mounting groove, and part of the brush extends out of the opening of the mounting groove.

[0012] In one embodiment, the mounting groove includes a reduced-diameter section and an enlarged-diameter section. The diameter of the enlarged-diameter section is greater than that of the reduced-diameter section to form a step, and the enlarged-diameter section forms the bottom of the mounting groove.

[0013] The connecting unit further includes a mounting seat. The mounting seat is connected to the brush, and at least part of the mounting seat is mounted in the enlarged-diameter section and is clamped with the step.

[0014] In one embodiment, a connecting groove is further formed on the side of the clamping seat facing away from the clamping plate. The connecting unit includes a connecting piece. The connecting piece passes through the clamping seat and is connected to the clamping plate, and the side of the connecting piece facing the clamping seat abuts against the bottom of the connecting groove.

[0015] In one embodiment, the steel belt wheel assembly further includes a bearing. The wheel body is rotatably connected to the wheel shaft through the bearing.

[0016] There are two wheel bodies, which are respectively arranged at both ends of the wheel shaft.

[0017] In one embodiment, the wheel body includes a first wheel and a second wheel. The first wheel is rotatably connected to the wheel shaft through a first bearing and a second bearing, and the first bearing and the second bearing are respectively located at both ends in the axial direction of the first wheel. The second wheel is rotatably connected to the wheel shaft through a third bearing and a fourth bearing, and the third bearing and the fourth bearing are respectively located at both ends in the axial direction of the second wheel.

[0018] In one of the embodiments, a first shaft sleeve, a second shaft sleeve and a third shaft sleeve are sleeved on the outer peripheral side of the axle. The first shaft sleeve is located between the first bearing and the bracket and abuts against the first bearing and the bracket. The second shaft sleeve is located between the second bearing and the third bearing and abuts against the second bearing and the third bearing. The third shaft sleeve is located between the fourth bearing and the bracket and abuts against the fourth bearing and the bracket.

[0019] Compared with the prior art, the utility model is provided with a cleaning component. The brush is fixedly connected to the axle through a connecting unit and extends into the running track of the steel belt, so that the brush always cleans the surface of the steel belt when the steel belt runs, and the sundries and dust contaminated on the steel belt are cleaned, so as to prevent the dirt from being difficult to clean after long-term operation, and then cause damage to the steel belt wheel and the steel belt, affecting the service life of both. Description of the Drawings

[0020] Figure 1 It is a structural sectional view of one of the embodiments of the steel belt wheel assembly provided by the utility model;

[0021] Figure 2 It is a structural schematic diagram of one of the embodiments of the steel belt wheel assembly provided by the utility model;

[0022] Figure 3 It is a structural schematic diagram of another angle of one of the embodiments of the steel belt wheel assembly provided by the utility model;

[0023] Figure 4 It is a side view of one of the embodiments of the steel belt wheel assembly provided by the utility model;

[0024] Figure 5 is Figure 4 a partial enlarged view of part A in

[0025] The meanings represented by the symbols in the figure are as follows:

[0026] 100, steel belt wheel assembly; 10, bracket; 11, bolt assembly; 20, steel belt wheel; 21, axle; 211, card slot; 22, wheel body; 221, first wheel; 222, second wheel; 223, protrusion; 30, cleaning component; 31, brush; 32, connecting unit; 321, clamping plate; 3211, clamping section; 3212, extension section; 322, clamping seat; 3221, installation groove; 3222, reduced diameter section; 3223, enlarged diameter section; 3224, step; 3225, connecting groove; 323, mounting seat; 324, connecting piece; 40, bearing; 41, first bearing; 42, second bearing; 43, third bearing; 44, fourth bearing; 50, first shaft sleeve; 51, second shaft sleeve; 53, third shaft sleeve. Detailed Embodiments

[0027] To make the above objects, features, and advantages of the present application more obvious and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0030] In the present application, unless otherwise clearly specified and limited, the first feature can be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature can be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the description of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the description of the present application includes any and all combinations of one or more of the related listed items.

[0032] The present utility model provides a steel belt wheel assembly 100, which is provided with a cleaning assembly 30. The self-cleaning of the steel belt is realized by means of a brush 31 that can penetrate into the running track of the steel belt, so as to prevent impurities from entering between the steel belt and the steel belt wheel and extend the service life of the steel belt wheel assembly 100.

[0033] Please refer to Figures 1-3 , the steel belt wheel assembly 100 includes a bracket 10, a steel belt wheel 20 and a cleaning assembly 30. The steel belt wheel 20 includes a wheel shaft 21 and a wheel body 22. The wheel shaft 21 is fixedly supported and connected to the bracket 10. The wheel body 22 is rotatably connected to the wheel shaft 21. The wheel body 22 can rotate around the axis of the wheel shaft 21, and a steel belt (not shown in the figure) is in contact with the outer peripheral side of the wheel body 22; the cleaning assembly 30 includes a brush 31 and a connecting unit 32. The connecting unit 32 is connected to the wheel shaft 21, the brush 31 is fixed to the connecting unit 32, and at least part of the brush 31 extends into the running track of the steel belt. Thus, since the wheel shaft 21 is fixed to the bracket 10, it can keep the relative position fixed like the bracket 10. And the brush 31 is fixed to the wheel shaft 21 through the connecting unit 32, so its position is also relatively fixed. The wheel shaft 21 bears the rotation of the wheel body 22. The wheel body 22 is connected to the steel belt and can drive the steel belt to rotate. Since the brush 31 extends into the running track of the steel belt, the steel belt is always abutted and cleaned by the brush 31 during operation. The brush 31 cleans the sundries and dust on the steel belt to prevent the dirt from being difficult to clean after long-term operation, which may cause damage to the steel belt wheel and the steel belt and affect their service lives.

[0034] Further, the steel belt includes a connecting section (not shown in the figure) connected to the wheel body 22 and a transmission section (not shown in the figure) separated from the wheel body 22. The brush 31 is spaced from the wheel body 22 in the first direction, and the brush 31 is perpendicular to the transmission section. Thus, no matter whether the steel belt runs forward or backward, the cleaning effect of the brush 31 on the steel belt is the same, and the cleaning effect is balanced, and there will be no problems such as interference with the steel belt.

[0035] Of course, in other embodiments, the brush 31 can also be arranged at an acute angle or an obtuse angle with the transmission section of the steel belt, as long as it can achieve the cleaning effect on the steel belt, and it is not limited to the above-mentioned perpendicular scheme.

[0036] Preferably, there are two brushes 31, which extend in opposite directions. The distance between the two ends of the two brushes 31 away from each other is greater than the diameter of the wheel body 22. Thus, since the distance between the two ends of the two brushes 31 is greater than the diameter of the wheel body 22, that is, the two ends of the two brushes 31 protrude beyond the tangents on both sides of the wheel body 22, that is, the two ends of the brush 31 can extend into the running track of the steel belt. Therefore, during the operation of the steel belt, its two parallel transmission sections will be cleaned by the two brushes 31 twice, so as to improve the cleaning efficiency and cleaning effect of the brush 31 on the steel belt.

[0037] Specifically, in this embodiment, the two brushes 31 are arranged on the same plane, parallel to each other on the same plane, and both are perpendicular to the transmission sections on both sides, which is convenient for assembly and processing and has a better cleaning effect.

[0038] The brush 31 is made of soft bristles to avoid damaging the steel belt.

[0039] To facilitate the installation of the brush 31, a connecting unit 32 is provided in this application. The connecting unit 32 includes a clamping plate 321. A clamping groove 211 is formed on the wheel shaft 21. The clamping plate 321 is installed in the clamping groove 211 to connect with the wheel shaft 21. Moreover, the clamping plate 321 is further connected to the bracket 10 through a bolt assembly 11 to further improve the installation stability of the clamping plate 321.

[0040] Specifically, the clamping plate 321 includes a clamping section 3211 and an extension section 3212. The clamping section 3211 is clamped in the clamping groove 211 and extends along the radial direction of the wheel shaft 21. The extension section 3212 is connected to the clamping section 3211 and is arranged at a specific angle. The extension section 3212 extends along the axial direction of the wheel shaft 21 and is spaced from the outer peripheral side of the wheel body 22. Thus, the extension section 3212 is spaced from the wheel body 22, so it will not interfere with the rotation of the wheel body 22, and can also prevent the steel belt on the wheel body 22 from coming off. The extension section 3212 is fixedly connected to the wheel shaft 21 by means of the clamping section 3211, so the overall position of the clamping plate 321 is stable.

[0041] To prevent the steel belt from coming off, in this embodiment, protrusions 223 are provided on the outer peripheral side of the steel belt wheel, and the protrusions 223 are located at both axial ends of the steel belt wheel to stop the movement of the steel belt.

[0042] The connecting unit 32 further includes a clamping seat 322. The clamping seat 322 is connected to the extension section 3212, and the brush 31 is connected to the clamping seat 322. Therefore, the brush 31 is fixedly connected to the extension section 3212 by means of the clamping seat 322, and the clamping seat 322 provides a space for the installation and fixation of the brush 31.

[0043] Please refer to Figures 4-5 , mounting grooves 3221 are provided on both sides in the width direction of the clamping seat 322, and the openings of the two mounting grooves 3221 face in opposite directions. The brush 31 is arranged in the mounting grooves 3221, and part of it extends out of the openings of the mounting grooves 3221. Thus, the mounting grooves 3221 facilitate the assembly of the brush 31. The brush 31 does not need to be installed on the clamping seat 322 through complex processes such as welding or bonding. And the groove walls of the mounting grooves 3221 can provide a stable limiting effect on the brush 31 to ensure that the brush 31 will not fall off. And because the mounting grooves 3221 face away from each other, the two brushes 31 also naturally extend away from each other to clean the parallel steel belts on both sides.

[0044] Further, the installation groove 3221 includes a reduced-diameter section 3222 and an enlarged-diameter section 3223. The diameter of the enlarged-diameter section 3223 is greater than that of the reduced-diameter section 3222 to form a step 3224, and the enlarged-diameter section 3223 forms the bottom of the installation groove 3221. The connecting unit 32 further includes a mounting seat 323. The mounting seat 323 is connected to the brush 31, and at least part of the mounting seat 323 is installed in the enlarged-diameter section 3223 and is snap-connected to the step 3224. In this way, when the mounting seat 323 moves outwards, it will be blocked by the step 3224, whereby the mounting seat 323 fixes the brush 31 in the installation groove 3221.

[0045] A connecting groove 3225 is further formed on the side of the snap-connection seat 322 facing away from the snap-board 321. The connecting unit 32 includes a connecting member 324. The connecting member 324 passes through the snap-connection seat 322 and is connected to the snap-board 321, and the side of the connecting member 324 facing the snap-connection seat 322 abuts against the bottom of the connecting groove 3225. In this way, the connecting member 324 connects the snap-connection seat 322 and the snap-board 321, and the formation of the connecting groove 3225 enables the connecting member 324 to be closer to the snap-board 321 during assembly. Therefore, the length of the connecting member 324 can be set shorter, and the space occupied by the connecting member 324 is also reduced.

[0046] In this embodiment, the connecting member 324 is a bolt, and in other embodiments, structures such as screws can also be used.

[0047] The steel belt pulley assembly 100 further includes a bearing 40. The pulley body 22 is rotatably connected to the wheel shaft 21 through the bearing 40. There are two pulley bodies 22, which are respectively arranged at both ends of the wheel shaft 21. In this way, the two pulley bodies 22 can operate simultaneously to improve the stability of the elevator operation and the weight that can be carried, and make the forces at both ends of the wheel shaft 21 balanced.

[0048] Further, the pulley body 22 includes a first pulley 221 and a second pulley 222. The first pulley 221 is rotatably connected to the wheel shaft 21 through a first bearing 41 and a second bearing 42, and the first bearing 41 and the second bearing 42 are respectively located at both axial ends of the first pulley 221. The second pulley 222 is rotatably connected to the wheel shaft 21 through a third bearing 43 and a fourth bearing 44, and the third bearing 43 and the fourth bearing 44 are respectively located at both axial ends of the second pulley 222. In this way, both axial ends of each pulley body 22 can be supported by two bearings 40. Therefore, the rotation of the pulley body 22 relative to the wheel shaft 21 is guided and abutted by the two bearings 40, making it more stable.

[0049] Specifically, in order to improve the stability of the installation of the bearing 40 and avoid the axial offset of the bearing 40, a positioning groove is formed on the inner peripheral wall of the wheel body 22. The positioning groove surrounds the inner wall of the wheel body 22 for one week and is formed at the edges of the inner walls at both axial ends of the wheel body 22. The bearing 40 abuts against the groove wall of the positioning groove, and the positioning groove at least stops the movement of the bearing 40 in one direction.

[0050] In other embodiments, the positioning groove can also be directly formed in the middle position of the inner wall of the wheel body 22 and is spaced from both end faces of the wheel body 22. That is to say, the groove walls on both sides of the positioning groove can respectively stop both side faces of the bearing 40 to further improve the installation stability of the bearing 40.

[0051] Different from the above-mentioned positioning groove directly limiting the two end faces of the bearing 40 axially, in this embodiment, a first shaft sleeve 50, a second shaft sleeve 51 and a third shaft sleeve 53 are sleeved on the outer peripheral side of the wheel shaft 21. The first shaft sleeve 50 is located between the first bearing 41 and the bracket 10 and abuts against the first bearing 41 and the bracket 10. The second shaft sleeve 51 is located between the second bearing 42 and the third bearing 43 and abuts against the second bearing 42 and the third bearing 43. The third shaft sleeve 53 is located between the fourth bearing 44 and the bracket 10 and abuts against the fourth bearing 44 and the bracket 10. In this way, through the abutment between the first shaft sleeve 50, the second shaft sleeve 51 and the third shaft sleeve 53 and the bracket 10 and the abutment with the bearing 40, the two end faces on both axial sides of the above-mentioned first bearing 41, second bearing 42, third bearing 43 and fourth bearing 44 are abutted and limited, so that the two wheel bodies 22 can work stably axially and will not have the problem of offset, thereby improving the running stability of the steel belt wheel assembly 100.

[0052] Compared with the prior art, the utility model is provided with a cleaning assembly 30. The brush 31 is fixedly connected to the wheel shaft 21 through the connecting unit 32 and extends into the running track of the steel belt, so that the brush 31 always cleans the surface of the steel belt when the steel belt runs, and the sundries and dust contaminated on the steel belt are cleaned to prevent the dirt from being difficult to clean after long-term operation, which will cause damage to the steel belt wheel and the steel belt and affect the service life of both.

[0053] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as the combinations of these technical features do not conflict, they should be considered as the scope recorded in this specification.

[0054] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A steel belt pulley assembly, characterized in that, Comprising: A bracket (10); A steel belt pulley (20), including a wheel axle (21) and a wheel body (22), the wheel axle (21) is fixedly supported and connected to the bracket (10), the wheel body (22) is rotatably connected to the wheel axle (21), the wheel body (22) can rotate around the axis of the wheel axle (21), and a steel belt contacts the outer peripheral side of the wheel body (22); A cleaning assembly (30), including a brush (31) and a connection unit (32), the connection unit (32) is connected to the wheel axle (21), the brush (31) is fixed to the connection unit (32), and at least part of the brush (31) extends into the running track of the steel belt.

2. The steel belt pulley assembly according to claim 1, wherein The steel belt includes a connection section connected to the wheel body (22) and a transmission section separated from the wheel body (22), the brush (31) is spaced from the outer peripheral wall of the wheel body (22) in the radial direction of the wheel body (22), and the brush (31) is arranged perpendicular to the transmission section.

3. The steel belt pulley assembly according to claim 1 or 2, characterized in that, There are two brushes (31), which extend in opposite directions, and the distance between the two ends of the two brushes (31) away from each other is greater than the diameter of the wheel body (22).

4. The steel belt pulley assembly according to claim 1, characterized in that The connection unit (32) includes a clamping plate (321) and a clamping seat (322), a clamping groove (211) is formed on the wheel axle (21), the clamping plate (321) includes a clamping section (3211) and an extension section (3212), the clamping section (3211) is clamped in the clamping groove (211) and extends along the radial direction of the wheel axle (21), the extension section (3212) is connected to the clamping section (3211) and is arranged at a specific angle, the extension section (3212) extends along the axial direction of the wheel axle (21) and is spaced from the outer peripheral side of the wheel body (22); The clamping seat (322) is connected to the extension section (3212), and the brush (31) is connected to the clamping seat (322).

5. The steel belt pulley assembly according to claim 4, wherein Installation grooves (3221) are provided on both sides in the width direction of the clamping seat (322), and the openings of the two installation grooves (3221) are arranged in opposite directions, the brush (31) is arranged in the installation grooves (3221), and part of it extends out of the opening of the installation grooves (3221).

6. The steel belt pulley assembly according to claim 5, wherein, The installation groove (3221) includes a reduced-diameter section (3222) and an enlarged-diameter section (3223), the diameter of the enlarged-diameter section (3223) is greater than that of the reduced-diameter section (3222) to form a step (3224), and the enlarged-diameter section (3223) forms the bottom of the installation groove (3221); The connection unit (32) further includes a mounting seat (323), the mounting seat (323) is connected to the brush (31), at least part of the mounting seat (323) is installed in the enlarged-diameter section (3223) and is clamped with the step (3224).

7. The steel belt pulley assembly according to claim 4, wherein, A connecting groove (3225) is further formed on the side surface of the clamping seat (322) facing away from the clamping plate (321). The connecting unit (32) includes a connecting member (324). The connecting member (324) passes through the clamping seat (322) and is connected to the clamping plate (321), and the side surface of the connecting member (324) facing the clamping seat (322) abuts against the bottom of the connecting groove (3225).

8. The steel belt pulley assembly according to claim 1, wherein, The steel belt pulley assembly further includes a bearing (40). The wheel body (22) is rotatably connected to the wheel shaft (21) through the bearing (40). There are two wheel bodies (22), which are respectively arranged at both ends of the wheel shaft (21).

9. The steel belt pulley assembly according to claim 1, wherein, The wheel body (22) includes a first wheel (221) and a second wheel (222). The first wheel (221) is rotatably connected to the wheel shaft (21) through a first bearing (41) and a second bearing (42), and the first bearing (41) and the second bearing (42) are respectively located at both axial ends of the first wheel (221). The second wheel (222) is rotatably connected to the wheel shaft (21) through a third bearing (43) and a fourth bearing (44), and the third bearing (43) and the fourth bearing (44) are respectively located at both axial ends of the second wheel (222).

10. The steel belt pulley assembly according to claim 9, characterized in that, A first shaft sleeve (50), a second shaft sleeve (51) and a third shaft sleeve (53) are sleeved on the outer peripheral side of the wheel shaft (21). The first shaft sleeve (50) is located between the first bearing (41) and the bracket (10) and abuts against the first bearing (41) and the bracket (10). The second shaft sleeve (51) is located between the second bearing (42) and the third bearing (43) and abuts against the second bearing (42) and the third bearing (43). The third shaft sleeve (53) is located between the fourth bearing (44) and the bracket (10) and abuts against the fourth bearing (44) and the bracket (10).

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