Speed measuring device, belt conveying device and sorting machine

Abstract

The utility model relates to the field of belt conveying, in particular to a speed measuring device, a belt conveying device and a sorting machine, the speed measuring device is used for measuring the belt conveying speed of the belt conveying device, and the speed measuring device comprises a supporting frame, a driving device and a driving device, the outer ring of the bearing is fixed in the mounting hole of the support frame; a wheel shaft of the meter counting wheel and an inner ring of the bearing are installed in a matched mode, and the outer wheel face of the meter counting wheel is used for making contact with the surface of the belt so that the meter counting wheel can be driven by the belt to rotate; and the encoder is fixed with the support frame, a connecting shaft of the encoder is connected with a wheel shaft of the meter counting wheel through an elastic coupling, and the encoder is used for receiving the number of rotation turns of the meter counting wheel to generate a corresponding pulse signal. According to the invention, the measurement precision can be effectively ensured, and the speed measurement reliability and stability are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of belt conveying, and in particular to a speed measuring device, a belt transmission device and a sorting machine. Background Art

[0002] In some material sorting scenarios, such as coal sorting machines, precise belt speed control is essential, making accurate belt speed detection crucial. If a meter wheel contacts the belt and vibrates during operation, the force is transmitted through the meter wheel to the encoder's connecting shaft. Due to the poor rigidity of the connecting shaft, deformation is transferred to the encoder's internal code disc, reducing measurement accuracy and even causing failure. Utility Model Content

[0003] In order to overcome the problems existing in the related art, an exemplary embodiment of the present disclosure provides a speed measuring device in a first aspect for measuring the belt transmission speed of a belt transmission device, wherein the speed measuring device includes: a support frame, a mounting hole is provided on the support frame; a bearing, the outer ring of the bearing is fixed in the mounting hole of the support frame; a meter wheel, the axle of the meter wheel is fitted with the inner ring of the bearing, the outer wheel surface of the meter wheel is used to contact the surface of the belt, so that it rotates under the drive of the belt; an encoder is fixed to the support frame, the connecting shaft of the encoder is connected to the axle of the meter wheel by an elastic coupling, and is used to receive the number of rotations of the meter wheel to generate a corresponding pulse signal.

[0004] In some embodiments, the meter wheel includes: a wheel disc, and the axle of the meter wheel is fixed to the wheel disc of the meter wheel through a flange.

[0005] In some embodiments, the outer wheel surface of the wheel disc is provided with a rubber layer.

[0006] In some embodiments, the speed measuring device further includes a fixed shaft, and the support frame further includes a connecting hole, and the connecting hole is sleeved on the fixed shaft, so that the support frame can swing around the fixed shaft.

[0007] In some embodiments, the speed measuring device also includes: a sleeve, which is sleeved on the fixed shaft and arranged close to the support frame, and the sleeve can rotate around the fixed shaft; a spring, one end of which is fixedly connected to the sleeve, and the other end is fixedly arranged on a side of the support frame close to the mounting hole; a bolt, which is used to fix the sleeve to the fixed shaft when the sleeve rotates and tightens the spring.

[0008] In some embodiments, the inner ring of the bearing and the wheel axle are fitted in a light interference fit manner, and the outer ring of the bearing and the support frame are fitted in a transition fit manner.

[0009] In some embodiments, the inner ring and / or outer ring of the bearing is provided with a circlip.

[0010] In some embodiments, a boss is provided at one end of the axle connected to the elastic coupling, and a hole is provided on the boss for fixed connection with the elastic coupling.

[0011] In a second aspect, the present disclosure further provides a belt transmission device, wherein the belt transmission device includes: a frame; rollers, both ends of which are supported on the frame; a belt, which is sleeved outside the rollers and is used to transmit materials; and a speed measuring device as described in the first aspect, which is used to detect the speed of the belt.

[0012] In a third aspect, the present disclosure further provides a sorting machine for material sorting, comprising: a belt transmission device as described in the second aspect, for conveying materials; an identification device, for identifying the materials conveyed by the belt transmission device; and a sorting device, for sorting the materials according to the identification results of the identification device.

[0013] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0014] The present disclosure provides a speed measuring device, a belt transmission device, and a sorting machine. The speed measuring device, by arranging bearings within a support frame, can maintain sufficient rigidity as a whole and is not susceptible to deformation that affects its function when a meter wheel is subjected to external force or vibration. Furthermore, the speed measuring device connects a connecting shaft of an encoder to the axle of the meter wheel via an elastic coupling. If the meter wheel is subjected to large force or vibration, the elastic coupling can act as a buffer, preventing force and deformation from being transmitted to the encoder shaft. This effectively ensures measurement accuracy and improves speed measurement reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present disclosure may be better understood by describing exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is a schematic structural diagram of a speed measuring device according to an exemplary embodiment of the disclosure;

[0017] Figure 2 is a schematic diagram of a speed measuring device according to another disclosed exemplary embodiment;

[0018] Figure 3 is a schematic diagram of a speed measuring device according to another disclosed exemplary embodiment. DETAILED DESCRIPTION

[0019] The specific embodiments of the present disclosure will be described below. It should be noted that in the specific description of these embodiments, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual embodiments. It should be understood that in the actual implementation of any embodiment, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet system-related or business-related restrictions, various specific decisions are often made, and this will also change from one embodiment to another. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the content disclosed by this utility model, some design, manufacturing or production changes based on the technical content disclosed in this disclosure are just conventional technical means and should not be understood as the content of this disclosure being insufficient.

[0020] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the usual meaning understood by persons of ordinary skill in the technical field to which the utility model belongs. The words "first", "second" and similar terms used in the description and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalent elements, and do not exclude other elements or objects. Words such as "connected" or "connected" and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0021] In some scenarios, such as within material sorting machines in coal mines, it's necessary to accurately measure belt speed while the belt is running at high speed. In some underground coal mines, encoders must be intrinsically safe for mining. These encoders ensure that even in the event of an unexpected electrical circuit failure, they won't cause sparks or overheat, thus preventing potential hazards. However, the connecting shafts of these encoders lack high rigidity and are susceptible to damage. In some related technologies, the encoder connecting shaft is directly connected to a meter wheel. When the meter wheel contacts the belt, the vibrations generated by the belt's operation are directly transmitted through the meter wheel to the encoder connecting shaft. Due to the poor rigidity of the connecting shaft, this can cause the connecting shaft to fail, affecting measurement accuracy. In other related technologies, a wider meter wheel is used, supported at both ends by a metal frame. The encoder is placed at one end of the meter wheel, while the other end is supported by bearings. This prevents the meter wheel from bending or deformation. However, this structure results in a larger overall speed measurement device, limiting its use in locations with limited installation space.

[0022] In order to overcome the problems existing in the related art, the exemplary embodiments of the present disclosure provide a speed measuring device, such as Figure 1-Figure 3 As shown, a speed measuring device 100 is used to measure the belt transmission speed of a belt transmission device, wherein the belt transmission device may include: a belt and a frame located on both sides of the belt, and may have two or more rollers mounted on the frame at both ends; the belt is sleeved on the rollers, and the belt transmission is achieved through the rotation of the rollers. The speed measuring device 100 can be used to detect the speed of the belt and may include: a support frame 110, a bearing 121, a meter wheel 130, and an encoder 140.

[0023] Support frame 110 may be provided with mounting holes. Support frame 110 may be made of stainless steel, which has a certain strength and hardness, suitable for use in scenarios requiring high-intensity loads, such as coal mine transportation. One or more mounting holes 110 may be provided on support frame 110. Mounting holes 110 may be circular holes and may be used to mount other components or equipment, such as bearings. This prevents the bearings from shifting or tilting due to external forces. Support frame 110 has a certain degree of stability, ensuring the smooth operation of the bearings.

[0024] Bearing 121, the outer ring of bearing 121 can be fixed in the mounting hole of support frame 110. The fixing method of the outer ring of bearing 121 and support frame 110 can be transition fit, bolt fixation, etc. The fit between the outer ring of bearing 121 and the mounting hole of support frame 110 needs to take into account tolerance and clearance to ensure that bearing 121 can be installed smoothly and avoid being too tight or too loose. Too loose may cause bearing 121 to shift during operation, while too tight may cause increased friction and difficulty in installation. The fixed connection between the outer ring of bearing 121 and support frame 110 can prevent bearing 121 from displacing during rotation, avoiding friction, vibration or damage caused by looseness or deviation of the outer ring. Bearing 121 will bear the axial force and radial force generated by the shaft during operation. By fixing the outer ring in the support frame 110, the load can be evenly distributed to prevent bearing 121 from deformation or damage.

[0025] Meter wheel 130, whose axle 131 can be mounted on the inner ring of bearing 121, and whose outer surface 132 can contact the surface of the belt, allowing it to rotate under the belt's drive. Meter wheel 130's axle 131 can be placed on the inner ring of bearing 121 and mounted therein. A light interference fit can be used to ensure a strong connection between axle 131 and bearing 121. When the belt of the belt transmission device begins to move, the belt surface can contact outer surface 132 of meter wheel 130. The movement of the belt surface can drive meter wheel 130 to rotate through friction.

[0026] The encoder 140 can be fixed to the support frame 110. The connecting shaft of the encoder 140 can be connected to the axle 131 of the meter wheel 130 via an elastic coupling 122, and can be used to receive the number of rotations of the meter wheel 130 to generate a corresponding pulse signal. The encoder 140 can be fixedly connected to the support frame 110, and the fixed connection method can be a bolt connection. The connecting shaft of the encoder 140 can be connected to the axle 131 of the meter wheel 130 via the elastic coupling 122, so that the encoder 140 can accurately record the rotation of the meter wheel 130. The rotation data of the meter wheel 130 can be converted into a corresponding pulse signal, and then speed measurement can be performed. One end of the elastic coupling 122 is fixed to the connecting shaft of the encoder 140, and the other end is fixed to the axle of the meter wheel 130. The elastic coupling 122 can prevent the meter wheel 130 from being affected by external forces or vibrations and affecting the measurement effect of the encoder 140, and can improve the stability of the measurement. In the case of large belt vibration, the axial or radial external forces on the meter wheel 130 can be buffered by the elastic coupling 122, thereby reducing the force on the encoder 140 and avoiding the risk of damage to the encoder 140.

[0027] In the disclosed embodiment, a speed measuring device is provided, and a bearing 121 is disposed within the support frame 110. This ensures the overall hardness and strength of the speed measuring device, providing a certain degree of stability, when the meter wheel 130 is subjected to external forces or vibrations. Furthermore, the connecting shaft of the encoder 140 is connected to the axle of the meter wheel 130 via the elastic coupling 122. This effectively ensures that the rotation information of the meter wheel 130 is accurately transmitted to the encoder 140, generating an accurate pulse signal, thereby ensuring the effectiveness of measurement accuracy and improving measurement stability.

[0028] In some embodiments, as Figure 1 As shown, the meter wheel 130 may include a wheel disc 133. The axle 131 of the meter wheel 130 may be fixed to the wheel disc 133 of the meter wheel 130 via a flange 134. A flange 134 is fixedly provided on one side of the meter wheel 130. The flange 134 may be fixedly connected to the wheel disc 133, and the fixed connection may be a bolted connection. In the disclosed embodiment, by connecting the axle 131 and the wheel disc 133 with the flange 134, the connection stability between the axle 131 and the wheel disc 133 is enhanced, preventing loosening or displacement caused by vibration, external forces, or long-term operation. This effectively copes with high-load and high-vibration working environments, improves the reliability and durability of the entire meter wheel, facilitates replacement and installation, and reduces costs.

[0029] In some embodiments, the outer surface 132 of the wheel 133 of the meter wheel 130 may be provided with a rubber layer. This rubber layer increases the friction between the outer surface 132 of the meter wheel 130 and the belt, ensuring more stable rotation of the meter wheel 130 when driven by the belt and avoiding measurement errors caused by slippage. The rubber material has strong wear resistance, which can reduce wear on the outer surface 132 when in contact with the belt, thereby extending the service life of the meter wheel 130. The rubber layer has a certain degree of elasticity and cushioning effect, effectively absorbing vibrations and shocks generated by the belt during operation, thereby improving measurement accuracy. In the disclosed embodiments, the provision of the rubber layer on the outer surface 132 of the meter wheel 130 significantly increases the friction between the outer surface 132 and the belt, reducing slippage and ensuring stable and precise rotation of the meter wheel 130. This not only improves the operational stability and accuracy of the meter wheel 130 but also effectively extends its service life.

[0030] In some embodiments, as Figure 1-Figure 3As shown, the speed measuring device 100 further includes a fixed shaft 151, and the support frame 110 further includes a connecting hole, which is sleeved on the fixed shaft 151, so that the support frame 110 can swing around the fixed shaft 151. One end of the fixed shaft 151 can be installed in the connecting hole of the support frame 110, and the other end can be fixedly connected to the sorting machine or belt transmission device through the base 152. The fixed shaft 151 can serve as a fulcrum for the support frame 110, so that the support frame 110 can swing freely around the fixed shaft 151. The swing of the support frame 110 can adapt to the movement changes of the belt. When the belt is in motion, the support frame 110 can swing so that the outer wheel surface 132 of the meter wheel 130 contacts the belt. When the belt is not in motion, the support frame 110 can swing so that the outer wheel surface 132 of the meter wheel 130 is separated from the belt. In the embodiment of the present disclosure, by setting a fixed shaft 151 on the speed measuring device 100, the support frame 110 can swing around the fixed shaft 151, which can adapt to the movement state of the belt, thereby improving the flexibility and adaptability of the speed measuring device 100.

[0031] In some embodiments, as Figure 1-Figure 3As shown, the speed measuring device 100 may further include: a sleeve 160, which can be sleeved on the fixed shaft 151 and can be arranged near the support frame 110, and the sleeve 160 can rotate around the fixed shaft 151; a spring 170, one end of which can be fixedly connected to the sleeve 160 and the other end can be fixedly arranged on a side of the support frame 110 near the mounting hole; and a bolt 180, which can be used to fix the sleeve 160 to the fixed shaft 151 when the sleeve 160 rotates and tightens the spring. The sleeve 160 can be arranged near the support frame 110 and sleeved on the fixed shaft 151, and can rotate around the fixed shaft 151 with the fixed shaft 151 as a fulcrum. One or more bolts 180 can be provided on the outer arc surface of the sleeve 151, and the sleeve 151 can ultimately be fixed to the fixed shaft 151 by the bolts 180 to ensure that the position of the sleeve 151 does not shift. The speed measuring device 100 may further include a spring 170. One end of the spring 170 may be mounted on a bolt 180 on the outer curved surface of the sleeve 151, and the other end may be mounted on a side of the support frame 110 near the mounting hole. When the speed measuring device 100 is to be installed on the belt, the sleeve 160 is rotated to tighten the spring 170 mounted on the bolt 180 on the outer curved surface of the sleeve 160. The support frame 110 then swings about the fixed shaft 151, bringing the outer surface 132 of the meter wheel 130 closer to the belt. The bolt 180 is then tightened to secure the sleeve 151 to the fixed shaft 151, completing the installation of the entire speed measuring device 100. The elastic force of the spring 170 then applies pressure to the meter wheel 130 against the belt surface, maintaining contact between the meter wheel 130 and the belt. In the embodiment of the present disclosure, a bolt 180 is provided on the sleeve 160, one end of the spring 170 is provided on the sleeve, and the other end is provided on the side of the support frame 110 close to the mounting hole. When the sleeve 160 rotates and tightens the spring 170, the sleeve 160 is fixed to the fixed shaft 151 by the bolt 180. The mutual cooperation between the components improves the installation flexibility of the speed measuring device 100.

[0032] In some embodiments, the inner ring of bearing 121 and axle 131 may be fitted with a light interference fit, while the outer ring of bearing 121 and support frame 110 may be fitted with a transition fit. The inner ring of bearing 121 and axle 131 may have a light interference fit, with the interference margin being 0.01-0.05 mm. This light interference fit ensures coaxial rotation of axle 131 and bearing 121, reducing measurement errors caused by loose fit. Furthermore, a smaller interference margin facilitates easier assembly and disassembly, facilitating subsequent maintenance and replacement. The outer ring of bearing 121 and support frame 110 may have a transition fit, ensuring that the outer ring of bearing 121 is stably mounted within support frame 110 and is not susceptible to loosening or displacement. At the same time, a certain amount of adjustment and displacement is permitted to accommodate minor deformation or vibration of meter wheel 130 during rotation. In the disclosed embodiment, by providing a light interference fit between the inner ring of the bearing 121 and the axle 131, the coaxial rotation of the axle 131 and the bearing 121 is ensured, thereby improving the measurement accuracy. The outer ring of the bearing 121 is transitionally fitted with the support frame 110, thereby stabilizing the supporting position of the outer ring, effectively buffering the impact of vibration on the bearing 121 and the support frame 110, facilitating disassembly and assembly, and extending the service life of the equipment.

[0033] In some embodiments, as Figure 1 As shown, the inner ring of the bearing 121 can be provided with an elastic retaining ring, and the outer ring of the bearing 121 can also be provided with an elastic retaining ring. The material of the elastic retaining ring can be spring steel, which has good wear resistance and elasticity. The elastic retaining ring 190 can limit the axial movement of the inner ring and the outer ring of the bearing 121, and can prevent the bearing 121 from slipping out of the mating position in a vibrating environment, thereby improving the reliability of the device. The elastic retaining ring can also absorb part of the vibration impact and reduce the concentrated pressure between the bearing 121 and the axle 131 and the support frame 110. In the embodiment of the present disclosure, by providing the elastic retaining ring 190 on the bearing 121, the fixing reliability of the bearing 121 can be improved, and the influence of vibration can be resisted, thereby avoiding wear caused by displacement and loosening, and the service life of the bearing 121 can be increased.

[0034] In some embodiments, a boss may be provided at one end of the axle 131 connected to the elastic coupling 122, and a hole may be provided on the boss for fixed connection with the elastic coupling 122. A boss may be provided at one end of the axle 131, and fixedly connected to the elastic coupling 122 via the boss. A D-shaped hole may be provided on the boss, and fixed to the elastic coupling 122 using a top screw, so as to ensure that no radial sliding occurs between the boss and the elastic coupling 122. In the embodiment of the present disclosure, by providing a boss on the axle 131, the fixing hole on the boss can ensure that the elastic coupling 122 remains stable during rotation, which can reduce offset and vibration. In addition, a hole is provided on the boss for easy disassembly and assembly, thereby improving the stability and flexibility of the connection between the axle 131 and the elastic coupling 122.

[0035] Based on the same inventive concept, embodiments of the present disclosure further provide a belt transmission device, wherein the belt transmission device may include: a frame, rollers, a belt, and a speed measuring device 100 according to any of the aforementioned embodiments. The frame may serve as a support. The rollers are supported on both ends by the frame, and there may be one or more rollers. The belt is sleeved over the rollers, and the rotation of the rollers drives the belt to transport material. The speed measuring device 100 may be used to detect the speed of the belt.

[0036] In an embodiment of the present disclosure, a belt transmission device is provided, wherein a roller is supported on a frame, a belt is sleeved around the roller, and a speed measuring device 100 is positioned above or below the belt. The speed measuring device 100 can be used to detect the speed of the belt. The speed measuring device 100 of the present disclosure can reliably detect the belt conveyor speed and, even in the presence of significant vibration, can ensure measurement accuracy and avoid damage to the encoder.

[0037] Based on the same inventive concept, an exemplary embodiment of the present disclosure further provides a sorting machine for material sorting, comprising: a belt transmission device, an identification device, and a sorting device as described in any of the aforementioned embodiments. The belt transmission device is provided with a speed measuring device 100 for detecting the belt speed.

[0038] The belt transmission device can be used to transport materials. The belt transmission device can be a conveyor belt, etc. The materials can be placed on the belt transmission device and transported to the identification device through the belt transmission device.

[0039] The identification device can be used to identify materials conveyed by the belt transmission device.

[0040] The sorting device can be used to sort the materials according to the identification results of the identification device. The sorting device can be set downstream of the belt transmission device and can sort the materials according to their categories, so that different categories of materials can be separated from each other.

[0041] Through the sorting machine of the disclosed embodiment, it is possible to transport materials through a belt transmission device, which is convenient for identification and classification by an identification device. Based on the identification and classification of materials by the identification device, different types of materials are finally sorted according to the sorting device, which can accurately and quickly classify and sort the materials to be tested, and has high identification accuracy and sorting accuracy. The speed measuring device in the belt conveyor device is provided with bearings in the support frame. When the meter wheel is subjected to external force or vibration, the speed measuring device as a whole can maintain sufficient rigidity and is not prone to deformation that affects the function; and the speed measuring device is connected by an elastic coupling to the connecting shaft of the encoder and the axle of the meter wheel. If the meter wheel is subjected to a large force or vibration, the elastic coupling can play a buffering role, and the force and deformation will not be transmitted to the encoder shaft, which can effectively ensure the measurement accuracy, improve the speed measurement reliability and stability, and thus ensure the accuracy of the sorting results.

[0042] This application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0043] In the context of this application, unless the context clearly indicates an exception, the words "a," "an," "an," and / or "the" do not refer to the singular and may include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements.

[0044] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0045] The basic concepts have been described above. It will be apparent to those skilled in the art that the above disclosure is merely illustrative and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the embodiments of the present application.

Claims

1. A speed measuring device for measuring the belt transmission speed of a belt transmission device, wherein: The speed measuring device comprises: A support frame, wherein a mounting hole is provided on the support frame; A bearing, the outer ring of the bearing being fixed in the mounting hole of the support frame; a meter wheel, wherein the wheel axle of the meter wheel is mounted in cooperation with the inner ring of the bearing, and the outer wheel surface of the meter wheel is used to contact the surface of the belt so as to rotate under the drive of the belt; An encoder is fixed to the support frame, and a connecting shaft of the encoder is connected to the axle of the meter wheel through an elastic coupling, and is used to receive the number of rotations of the meter wheel and generate a corresponding pulse signal.

2. The speed measuring device according to claim 1, wherein: The meter wheel comprises a wheel disc, and the wheel axle of the meter wheel is fixed on the wheel disc of the meter wheel through a flange.

3. The speed measuring device according to claim 2, wherein: The outer wheel surface of the wheel disc is provided with a rubber layer.

4. The speed measuring device according to claim 1, wherein: The speed measuring device further includes a fixed shaft, and the support frame further includes a connecting hole, which is sleeved on the fixed shaft so that the support frame can swing around the fixed shaft.

5. The speed measuring device according to claim 4, wherein: The speed measuring device further comprises: A shaft sleeve is sleeved on the fixed shaft and is arranged close to the support frame, and the shaft sleeve can rotate around the fixed shaft; a spring, one end of which is fixedly connected to the shaft sleeve, and the other end of which is fixedly arranged on a side of the support frame close to the mounting hole; The bolt is used to fix the sleeve to the fixed shaft when the sleeve rotates and the spring is tightened.

6. The speed measuring device according to claim 1, wherein: The inner ring of the bearing and the wheel axle are fitted in a light interference fit manner, and the outer ring of the bearing and the support frame are fitted in a transition fit manner.

7. The speed measuring device according to claim 1, wherein: The inner ring and / or outer ring of the bearing is provided with an elastic retaining ring.

8. The speed measuring device according to claim 1, wherein: One end of the wheel shaft connected to the elastic coupling is provided with a boss, and the boss is provided with a hole for fixed connection with the elastic coupling.

9. A belt transmission device, wherein: The belt transmission device comprises: frame; A roller, with both ends supported on the frame; A belt, sleeved outside the roller, for conveying materials; The speed measuring device according to any one of claims 1 to 8, used to detect the speed of the belt.

10. A sorting machine for sorting materials, comprising: The belt transmission device according to claim 9, used for conveying materials; an identification device for identifying the material conveyed by the belt transmission device; The sorting device is used to sort the materials according to the recognition result of the recognition device.

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