Synchronous belt transmission system and cleaning device

Abstract

A synchronous belt transmission system comprises a synchronous belt, a driving belt wheel and a driven belt wheel, the driving belt wheel and the driven belt wheel are connected with the synchronous belt in a meshed mode, and the difference value between the center distance between the driving belt wheel and the driven belt wheel and the theoretical center distance of the driving belt wheel and the driven belt wheel is smaller than or equal to minus 0.2 times of the tooth height of the synchronous belt. And the tooth height is greater than or equal to negative 2 times of the tooth height. According to the technical scheme, the center distance between the driving belt wheel and the driven belt wheel can be corrected to be within a reasonable range on the basis of the theoretical center distance, and noise of the synchronous belt in the transmission process is effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of synchronous belt transmission, and in particular to a synchronous belt transmission system and a cleaning device. Background Art

[0002] Synchronous belt drives are commonly used in cleaning equipment such as vacuum cleaners, floor scrubbers, floor scrubbers, and sweepers. Conventional synchronous belt drive systems primarily consist of a motor, a driving pulley, a belt, a driven pulley, a chassis, bearings, and a tensioning device. However, due to structural constraints, tensioning devices are often not used in cleaning equipment. Consequently, the center distance of the belt drive is a relatively precise fixed value in practice. Synchronous belt drives generate high acoustic power and noise in these applications. There is an urgent need for a conventional synchronous belt system to address this noise issue. Utility Model Content

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present disclosure provides a synchronous belt transmission system, comprising a synchronous belt, a driving pulley and a driven pulley, wherein the driving pulley and the driven pulley are meshedly connected with the synchronous belt, wherein:

[0005] The difference between the center distance between the driving pulley and the driven pulley and their theoretical center distance is less than or equal to negative 0.2 times the tooth height of the synchronous belt, and greater than or equal to negative 2 times the tooth height.

[0006] In a second aspect of the present disclosure, a cleaning device is provided, comprising the above-mentioned synchronous belt transmission system.

[0007] The above description is only an overview of the technical solution provided by the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other features and effects of the present disclosure more obvious and easy to understand, the following specifically lists the implementation methods of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0009] In order to more clearly illustrate the embodiments of the present disclosure 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0010] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the exemplary embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered limiting of the present application. Throughout the accompanying drawings, the same reference symbols denote the same components. In the accompanying drawings:

[0011] Figure 1 This is a schematic diagram of the structure of the present invention assembled in a gearbox housing;

[0012] Figure 2 for Figure 1 Schematic diagram of the explosion structure;

[0013] Figure 3 This is a schematic cross-sectional view of the structure of the present invention assembled in a gearbox housing;

[0014] Figure 4 This is one of the structural diagrams of the first noise reduction mechanism disclosed in the present invention;

[0015] Figure 5 This is the second structural diagram of the first noise reduction mechanism disclosed in the present invention;

[0016] Figure 6 This is a structural schematic diagram of a first embodiment of the first noise reduction mechanism disclosed herein;

[0017] Figure 7 This is a structural schematic diagram of a second embodiment of the first noise reduction mechanism disclosed herein;

[0018] Figure 8 Schematic diagram of the structure of the third embodiment of the first noise reduction mechanism disclosed herein;

[0019] Figure 9 This is a schematic diagram of the sound pressure level test at a position 10 cm in front of the active pulley side module;

[0020] Figure 10 This is a structural schematic diagram of the second noise reduction mechanism disclosed in the present invention being arranged within the synchronous belt wrap angle range;

[0021] Figure 11 Schematic diagram of the structure of the first noise reduction mechanism and the second noise reduction mechanism disclosed in the present invention;

[0022] Figure 12 It is a schematic diagram of the wrap angle end and wrap angle range disclosed in the present invention.

[0023] in, Figures 1 to 12 The corresponding relationship between the reference numerals and component names is as follows:

[0024] 10 - Motor; 20 - Output rotating shaft; 30 - Bushing; 40 - Bearing; 50 - Motor screw; 60 - Wrap angle range; 61 - Wrap angle end;

[0025] 1-synchronous belt; 2-driving pulley; 3-driven pulley; 4-connecting part; 5-limiting plate; 6-gearbox housing; 7-first noise reduction mechanism; 8-second noise reduction mechanism. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0028] At present, synchronous belt drive is a well-known mechanical transmission method. The known synchronous belt drive system mainly includes a motor, a driving pulley, a synchronous belt, a driven pulley, a gear box bottom shell, a bearing, an output rotating shaft, a tensioning device, etc. In the reduction transmission, the driving pulley is a small pulley, and in the speed increase transmission, the driven pulley is a small pulley. The present invention is described in a specific embodiment with the reduction transmission. In the application field of floor scrubbers and sweepers, a tensioning device is not used, resulting in the center distance of the belt drive being a relatively precise fixed value in actual application. In application, the transmission ratio is also relatively large, resulting in a reduction in the number of meshing teeth of the small pulley, which is prone to early failure of the small pulley or synchronous belt. In application, the method of reducing the center distance is also adopted to reduce the sound power caused by the synchronous belt drive, which is more likely to cause early failure of the small pulley or synchronous belt, and even tooth jumping during use, emitting a harsh noise.

[0029] Based on this, an embodiment of the present disclosure provides a synchronous belt drive system, including a synchronous belt, a driving pulley, and a driven pulley. The driving pulley and the driven pulley are meshed with the synchronous belt, and the center distance between the driving pulley and the driven pulley is set to be a theoretical center distance minus 0.2 times the tooth height to 2 times the tooth height. Based on the theoretical center distance, the center distance between the driving pulley and the driven pulley can be corrected to a reasonable range, effectively reducing noise during the synchronous belt transmission process.

[0030] The following is a detailed description of the synchronous belt transmission system through specific embodiments:

[0031] Reference Figures 1 to 12As shown, in a first aspect of the present disclosure, a synchronous belt drive system is provided, comprising a synchronous belt 1, a driving pulley 2, and a driven pulley 3. The driving pulley 2 and the driven pulley 3 are meshed with the synchronous belt 1, and the difference between the center distance between the driving pulley 2 and the driven pulley 3 and their theoretical center distance is less than or equal to minus 0.2 times the tooth height of the synchronous belt and greater than or equal to minus 2 times the tooth height. For example, the difference between the center distance and its theoretical center distance is minus 0.3-1 times the tooth height.

[0032] The calculation method for the theoretical center distance described in this disclosure is common knowledge in the field of belt drive technology. The specific calculation formula is based on the Machinery Industry Standard of the People's Republic of China (JB / T 7512.3-2014) and is not detailed here. The center distance between the driving pulley 2 and the driven pulley 3 in this disclosure is hereinafter referred to as the corrected center distance. Since the corrected center distance in this disclosure is less than the theoretical center distance and the center distance is a value greater than zero, the calculation method for the corrected center distance can also be expressed as the theoretical center distance minus 0.2 to 2 times the tooth height of the synchronous belt selected to calculate the theoretical center distance.

[0033] The tooth height disclosed in the present invention is one of the belt tooth size data involved in calculating the theoretical center distance, and is specifically referred to the Machinery Industry Standard of the People's Republic of China (JB / T 7512.1-2014). Specifically, existing belt tooth models can be divided into 2M, 3M, 5M, 8M, etc., and the specific parameters of the belt tooth size include tooth height, pitch, tooth top fillet radius, tooth root fillet radius, tooth root thickness, tooth profile angle, belt height (single side), belt height (double side) and pitch line difference. The parameters specifically involved in the present invention are tooth height and pitch. For example, the tooth height of 2M is a fixed value of 0.75 mm, and the pitch is a fixed value of 2 mm; the tooth height of 3M is a fixed value of 1.22 mm, and the pitch is a fixed value of 3 mm; the tooth height of 5M is a fixed value of 2.06 mm, and the pitch is a fixed value of 5 mm; the tooth height of 8M is a fixed value of 3.38 mm, and the pitch is a fixed value of 8 mm. By confirming the belt tooth size selected when calculating the theoretical center distance, the tooth height value is determined. After calculating the theoretical center distance, the tooth height of the belt tooth size selected for calculating the theoretical center distance is reduced by 0.2 to 2 times to calculate the corrected center distance of the present disclosure. Ultimately, the center distance formed between the driving pulley 2 and the driven pulley 3 of the synchronous belt transmission system of the present disclosure is obtained, thereby reducing the sound power caused by the synchronous belt transmission. In the range of reducing the theoretical center distance by 0.2 to 2 times the tooth height, the sound power begins to show a significant decrease at the parameter of reducing the tooth height by 0.2 times. The effect is best achieved when reducing the tooth height by 0.5 times. Thereafter, the effect of reducing the sound power gradually slows down. When the tooth height is reduced by 2 times, the effect of reducing the sound power no longer increases significantly, and the operating stability of the synchronous belt system is disturbed.

[0034] like Figure 9The figure shows the sound pressure level at a position 10 cm in front of the module on the active pulley 1 side. Although the sound pressure level increases with the increase in motor speed both when the center distance is corrected (dashed line) and when the center distance is not corrected (solid line), the sound pressure level increases when the center distance is corrected, but it can be seen that it is suppressed overall. This trend is particularly significant in the area with high motor speeds, and the sound pressure level is significantly suppressed. In other words, as the motor speed increases, the meshing sound pressure level also increases, but by correcting the center distance, it is possible to prevent the occurrence of higher sound pressure levels and appropriately reduce the sound pressure level.

[0035] The above-mentioned belt tooth size standards are national standards, and the present disclosure is not limited to the size standards provided in the embodiments. The embodiments of the present disclosure only illustrate the relationship between the theoretical center distance and the tooth height, and aim to provide a proportional relationship between the theoretical center distance and the tooth height to obtain the corrected center distance. If the tooth height and pitch in the national standard change, the present disclosure is still applicable.

[0036] In some embodiments, the present disclosure further includes a first noise reduction mechanism. When the belt drive system, after correcting the center distance, is stationary, the synchronous belt 1 is in a relaxed state. During operation, the tight side of the synchronous belt 1 is in a taut state, transmitting torque between the driving pulley 2 and the driven pulley 3. When the loose side is in a relaxed state, the synchronous belt 1 is prone to tooth jumping during engagement with the driving pulley 2 and the driven pulley 3. By providing the first noise reduction mechanism, tooth jumping can be avoided, thereby reducing noise and mechanical failure. Specifically, the first noise reduction mechanism of the present disclosure is provided on one side of the driving pulley 2 and / or the driven pulley 3. The first noise reduction mechanism includes a limiting portion and a connecting portion 4. The limiting portion has a limiting plate 5. The limiting plate 5 is provided within the wrap angle range of the synchronous belt 1 and is used to limit tooth jumping between the driving pulley 2 and / or the driven pulley 3 and the synchronous belt 1. The connecting portion 4 is used to connect the limiting plate 5 to the gearbox housing 6.

[0037] In this embodiment, the wrap angle of the present disclosure is the central angle of the pulley corresponding to the contact arc between the belt and the pulley, as shown in FIG. Figure 12The wrap angle range and wrap angle end portions described in the present disclosure are shown to provide a clear positional relationship. The specific technical range of the wrap angle is calculated based on known standards. Specifically, the first noise reduction mechanism of the present disclosure is provided on one side of the driving pulley 2 and / or the driven pulley 3. Tooth skipping often occurs on the side of the driving pulley 2. The embodiment of the present disclosure provides a detailed explanation of the positional relationship based on the side of the driving pulley 2. Whether the first noise reduction mechanism is provided on both the driving pulley 2 and the driven pulley 3 is adjusted based on the corrected center distance. When the corrected value of the corrected center distance is large, for example, when the corrected center distance is set to 1.5 times or 2 times the tooth height less than the theoretical center distance, tooth skipping may also occur on the side of the driven pulley 3. Alternatively, when the transmitted torque continues to increase and exceeds the torque transmitted by half the number of teeth meshed between the synchronous belt and the pulley, tooth skipping may also occur on the side of the driven pulley 3. Therefore, the first noise reduction mechanism is provided on both the driving pulley 2 and the driven pulley 3.

[0038] In synchronous belt drive systems, such as Figure 1 、 2 As shown in Figures 4 and 5, the first noise reduction mechanism of the present disclosure can be installed on the gearbox housing, and the limit plate 5 is arranged within the wrap angle range of the synchronous belt 1 through the connecting portion 4 to prevent the driving pulley 2 and / or the driven pulley 3 from jumping teeth with the synchronous belt 1. Furthermore, to prevent tooth jumping, a fitting clearance is provided between the limit plate 5 and the synchronous belt 1. The fitting clearance within the wrap angle range of the limit plate 5 and the synchronous belt 1 of the present disclosure can be determined based on the circular runout of the motor shaft and the pulley, the height of the synchronous belt teeth, and the belt thickness tolerance.

[0039] In some embodiments, there are multiple limit plates 5, and the multiple limit plates 5 are arranged in the wrap angle range of the synchronous belt 1. Figure 6 As shown, in this embodiment, the limit plate bodies 5 are arranged at both ends of the wrap angle of the synchronous belt 1. The number of the limit plate bodies 5 at each end is not limited to one. The position selection and the number setting can be carried out according to the size of the gear, the number of revolutions and other data. In the embodiment disclosed in the present invention, the number of the limit plate bodies 5 at each end is set to one. Furthermore, the number of the limit plate bodies 5 is set to two, and the two limit plate bodies 5 are symmetrically arranged relative to the center line connecting the driving pulley 2 and the driven pulley 3. This ensures that the synchronous belt 1 and the pulleys can be meshed and transmitted more smoothly. It should be noted that in this embodiment, the limit plate bodies 5 at both ends are discontinuous, but the limit plate bodies 5 at both ends jointly form a limit range, so that when the synchronous belt 1 jumps teeth, it can be suppressed within the limit range.

[0040] In some embodiments, the limiting plate body 5 is configured as an arc-shaped plate, and the limiting plate body has a limiting stop surface, and the limiting stop surface maps the synchronous belt wrap angle range, such as Figure 7As shown. In this embodiment, the limiting plate 5 blocks the entire wrap angle 60 of the synchronous belt 1 between the two wrap angle ends 61 along the extension direction of the synchronous belt 1. It should be noted that the wrap angle range mapped in this embodiment is the range in the extension direction of the synchronous belt 1, while the range in the width direction of the synchronous belt 1 is set to 0.5 to 1 times the width of the synchronous belt 1, for example, 0.7-1 times the width of the synchronous belt 1.

[0041] In some embodiments, one end of the limit plate 5 of the present disclosure extends in the tangential direction of the rotation of the synchronous belt 1, and the other end extends in the tangential direction of the reverse rotation of the synchronous belt 1, and both ends of the limit plate 5 extend outside the range of the wrap angle of the synchronous belt 1. Figure 8 As shown, in this embodiment, both ends of the limiting plate body 5 extend beyond the wrap angle range of the synchronous belt 1, which can block the wrap angle range of 60° of the synchronous belt 1 and may block the conduction of sound, further reducing noise.

[0042] Furthermore, if Figures 4 to 8 As shown, the limit plate body 5 in each embodiment of the present disclosure has a limit stop surface, which is set to an arc shape so as to be more compatible with the shape of the wrap angle range of the synchronous belt 1. The limit stop surface can be a continuous arc surface or a continuous arc surface. Figure 6 The limiting plate body 5 shown in the figure is composed of a plurality of separate limiting plate bodies 5 whose respective limiting surfaces jointly form an arc-shaped limiting surface.

[0043] In some embodiments, the length of the limiting plate body 5 can cover the entire range of the wrap angle, or it can cover a partial range of the wrap angle. The length extension direction of the limiting plate body 5 in the wrap angle range is consistent with the extension direction of the synchronous belt 1, and the height direction of the limiting plate body 5 is consistent with the extension direction of the width of the synchronous belt 1. The length of the portion of the limiting plate body 5 that is consistent with the extension direction of the synchronous belt 1 is set to 1 times the pitch of the synchronous belt 1 to the arc length of the wrap angle. Among them, the length of this portion is set to one times the pitch as the minimum length. If it is less than one times the pitch, the tooth cannot be effectively skipped, and if it exceeds the arc length of the wrap angle, it is not conducive to assembly. It can be understood that when the limiting plate body 5 is entirely within the wrap angle range, the length of the portion that is consistent with the extension direction of the synchronous belt 1 is the length of the limiting plate body 5.

[0044] In some embodiments, a second noise reduction mechanism 8 is included, and the second noise reduction mechanism 8 is arranged on one side of the driving pulley and / or the driven pulley. The second noise reduction mechanism 8 includes a noise reduction roller, and there is a fitting gap 1 between the noise reduction roller and the synchronous belt to prevent the synchronous belt 1 from jumping teeth.

[0045] In this embodiment, if Figure 11As shown, the present disclosure is provided with a second noise reduction mechanism 8 having a noise reduction roller. The noise reduction roller serves as a blocking structure for the synchronous belt 1 to prevent tooth jumping, and can better enable the transmission system to transmit when a tooth jumping tendency occurs. Specifically, the noise reduction roller includes a roller body, a bearing and a connector. The noise reduction roller of the present disclosure can be a driven roller or an active roller. When the active roller is selected, it needs to cooperate with the drive motor to achieve rolling, and the rolling speed tends to be the same as the transmission speed of the synchronous belt 1. One embodiment is that the roller surface of the noise reduction roller is set to a plastic material, thereby reducing the noise generated when the synchronous belt 1 contacts the noise reduction roller.

[0046] In some embodiments, the noise reduction roller is arranged within the wrap angle range of the synchronous belt to enhance the anti-tooth jumping effect.

[0047] In some embodiments, a first noise reduction mechanism and a second noise reduction mechanism 8 are provided to cooperate with each other to realize the anti-tooth jump of the synchronous belt, and the number and setting position of each noise reduction mechanism can be combined according to the setting mode of each noise reduction mechanism mentioned above. Figure 10 As shown, the first noise reduction mechanism 7 and the second noise reduction mechanism 8 work together to prevent the synchronous belt 1 from skipping teeth, and the noise reduction roller is arranged outside the wrap angle range of the synchronous belt 1 and near the end of the wrap angle of the synchronous belt 1. This embodiment shows that the first noise reduction mechanism 7 is arranged on one side of the driving pulley 2, and the second noise reduction mechanism 8 is arranged on one side of the driven pulley 3. When a tooth skipping trend occurs, the position is random. This embodiment can ensure that tooth skipping can be prevented both within and outside the wrap angle range, and the noise reduction roller can also ensure the smoothness of the transmission of the synchronous belt 1. Furthermore, the clearance between the first noise reduction mechanism 7 and the second noise reduction mechanism 8 and the synchronous belt 1 can be made smaller than the clearance between the second noise reduction mechanism 8 and the synchronous belt 1. This allows the noise reduction roller to contact the synchronous belt 1 first when a more serious tooth skipping trend occurs, ensuring the smoothness of the transmission of the synchronous belt 1 and avoiding excessive transmission fluctuations. It should be noted that the first and second noise reduction mechanisms 7, 8 can be arranged on one side of the driving pulley 2. The arrangement can be such that the limit plate 5 of the first noise reduction mechanism 7 is set within the wrap angle range, and the noise reduction roller of the second noise reduction mechanism 8 is set outside the wrap angle range. Alternatively, both the limit plate 5 and the noise reduction roller can be set within the wrap angle range. Alternatively, the first and second noise reduction mechanisms 7, 8 can be arranged on both the driving pulley 2 and the driven pulley 3. The above arrangement should be configured according to different corrected center distances and product types.

[0048] In some embodiments, the clearance between the limit plate 5 and the synchronous belt 1, and the clearance between the noise reduction roller and the synchronous belt 1, can be configured within the following ranges: the minimum clearance is set to 0.1 times the tooth height; the maximum clearance is equal to 1 times the tooth height of the synchronous belt 1 minus the belt thickness tolerance, minus 0.1 times the tooth height. This effectively prevents tooth skipping and the noise caused by tooth skipping, while reducing the sound pressure level. Within the corrected center distance range disclosed herein, if the clearance between the limit plate 5 and the synchronous belt 1 exceeds the maximum clearance, the travel of the synchronous belt 1 during the tooth skipping process is excessive, making it difficult to prevent tooth skipping and causing excessive noise. When the clearance between the limit plate 5 and the synchronous belt 1 is less than 0.1 times the tooth height, i.e., at the minimum clearance, the clearance is too small. When the tooth skipping trend occurs, the synchronous belt 1 will contact the limit plate 5, creating resistance between the synchronous belt 1 and the limit plate 5, affecting the transmission effect.

[0049] In some embodiments, the height of the limit plate 5 of the present disclosure is set to 0.5 to 1 times the bandwidth of the synchronous belt 1. Specifically, a height of the limit plate 5 less than 0.5 times the bandwidth of the synchronous belt 1 is not conducive to preventing tooth skipping, while a height greater than 1 times the bandwidth of the synchronous belt 1 is not conducive to assembly. The height of the noise reduction roller of the present disclosure, i.e., the roller surface width, can also be set to 0.5 to 1 times the bandwidth of the synchronous belt 1, wherein the roller surface width direction of the noise reduction roller is consistent with the width direction of the synchronous belt 1.

[0050] In a second aspect of the present disclosure, a cleaning device includes the above-mentioned synchronous belt drive system.

[0051] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0052] In the description of the present disclosure, it is to be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, cannot be understood as a limitation on the present disclosure.

[0053] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A synchronous belt transmission system, characterized in that: It includes a synchronous belt, a driving pulley and a driven pulley, wherein the driving pulley and the driven pulley are meshed and connected with the synchronous belt, wherein: The difference between the center distance between the driving pulley and the driven pulley and their theoretical center distance is less than or equal to negative 0.2 times the tooth height of the synchronous belt, and greater than or equal to negative 2 times the tooth height.

2. The synchronous belt transmission system according to claim 1, characterized in that: It also includes a first noise reduction mechanism, which is arranged on one side of the driving pulley and / or the driven pulley. The first noise reduction mechanism has a limiting plate body, and there is a fitting gap between the limiting plate body and the synchronous belt to prevent the synchronous belt from jumping teeth.

3. The synchronous belt transmission system according to claim 2, characterized in that: The limiting plate body is arranged within the wrap angle range of the synchronous belt.

4. The synchronous belt transmission system according to claim 2, characterized in that: At least two limiting plates are provided, and the limiting plates are respectively provided at two ends of the synchronous belt wrap angle range.

5. The synchronous belt transmission system according to claim 3, characterized in that: The number of the limiting plates is set to at least two, and the limiting plates are symmetrically arranged relative to the center line connecting the driving pulley and the driven pulley.

6. The synchronous belt transmission system according to claim 3, characterized in that: The limiting plate body is configured as an arc-shaped plate, and the limiting plate body has a limiting stop surface, and the limiting stop surface maps the synchronous belt wrap angle range.

7. The synchronous belt transmission system according to claim 1, characterized in that: It also includes a second noise reduction mechanism, which is arranged on one side of the driving pulley and / or the driven pulley. The second noise reduction mechanism includes a noise reduction roller. There is a fitting gap between the noise reduction roller and the synchronous belt to prevent the synchronous belt from jumping teeth.

8. The synchronous belt transmission system according to claim 7, characterized in that: The noise reduction roller is arranged within the wrap angle range of the synchronous belt.

9. The synchronous belt transmission system according to claim 3, characterized in that: It also includes a second noise reduction mechanism, which includes a noise reduction roller. The noise reduction roller is arranged outside the range of the synchronous belt wrap angle, and the noise reduction roller is close to the end of the synchronous belt wrap angle. There is a fitting gap between the noise reduction roller and the synchronous belt to prevent the synchronous belt from jumping teeth.

10. The synchronous belt transmission system according to any one of claims 2 to 9, characterized in that: The fitting clearance is greater than or equal to 0.1 times the tooth height, and less than or equal to the difference between the tooth height and the thickness tolerance of the synchronous belt and 0.1 times the tooth height.

11. The synchronous belt transmission system according to claim 2, characterized in that: The length of the limiting plate is greater than or equal to 1 times the pitch of the synchronous belt.

12. The synchronous belt transmission system according to claim 2, characterized in that: The height of the limiting plate body is greater than or equal to 0.5 times the width of the synchronous belt, and less than or equal to 1 times the width of the synchronous belt.

13. The synchronous belt transmission system according to claim 7, characterized in that: The height of the noise reduction roller is greater than or equal to 0.5 times the width of the synchronous belt, and less than or equal to 1 times the width of the synchronous belt.

14. The synchronous belt transmission system according to any one of claims 2 to 9, characterized in that: The fitting clearance is less than or equal to 0.9 times the difference between the tooth height of the synchronous belt and the thickness tolerance of the synchronous belt, and greater than or equal to 0.1 times the tooth height.

15. The synchronous belt transmission system according to claim 2, characterized in that: The first noise reduction mechanism is provided on both the driving pulley side and the driven pulley side.

16. The synchronous belt transmission system according to claim 7, characterized in that: The second noise reduction mechanism is provided on both the driving pulley side and the driven pulley side.

17. A cleaning device, characterized in that: A synchronous belt transmission system comprising the synchronous belt transmission system according to any one of claims 1 to 16.

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