Non-standard pressing pressure control device
Patent Information
- Application Number
- CN202522387583.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-11-11
AI Technical Summary
[0003]但针对非标工件，传统装置存在一定局限：不同非标工件的压合需求差异大，现有装置需通过机械结构改造适配，更换周期长，且难以实现连续化生产
Smart Images
Figure CN224668181U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure control equipment technology, specifically a non-standard pressure control device. Background Technology
[0002] In industrial production, pressing is a crucial process for joining or fixing two or more workpieces by applying specific pressure. For standard-sized workpieces, existing pressing devices can achieve stable pressing by using a fixed pressure head and preset pressure parameters.
[0003] However, traditional equipment has certain limitations for non-standard workpieces: the pressing requirements of different non-standard workpieces vary greatly, existing equipment needs to be adapted through mechanical structure modification, the replacement cycle is long, and it is difficult to achieve continuous production.
[0004] Therefore, for the pressing requirements of non-standard workpieces, there is an urgent need for a control device with pressure regulation. Utility Model Content
[0005] The purpose of this invention is to provide a non-standard pressing pressure control device to solve the problems mentioned in the background art.
[0006] In view of the above problems, the technical solution proposed by this utility model is as follows: A non-standard pressing pressure control device includes a base, with columns mounted on both sides of the base, and a top plate fixed between the columns. A first driving member is mounted on the bottom surface of the top plate, and a second driving member is also provided on the bottom surface of the top plate. The first driving member drives the second driving member to move along the long side of the top plate. A fixing block is provided above the base, and the second driving member drives the fixing block to move vertically. The bottom surface of the fixing block has a cavity, and a pressure sensor is mounted on the top surface of the cavity. A pressure plate is suspended inside the cavity, and a retainer is mounted on the top surface of the pressure plate. The retainer is fixedly connected to the detection end of the pressure sensor. The pressure sensor and the second driving member are electrically connected. A pair of fixing members slide on the top surface of the base for clamping non-standard parts. The seat is equipped with a third driving component, which drives a pair of fixed components to move synchronously in opposite directions. The first and second driving components cooperate to move the fixed blocks horizontally and vertically, facilitating the adjustment of the pressure plate position to adapt to the pressing requirements of different non-standard parts without frequent modifications to the mechanical structure. The pressure sensor is connected to the pressure plate through a retainer and is electrically connected to the second driving component. It can detect the pressing pressure of the pressure plate on the non-standard parts in real time and feed the signal back to the second driving component to achieve precise pressure adjustment and avoid improper pressure affecting the pressing quality. The third driving component drives a pair of fixed components to move synchronously in opposite directions, which can stably clamp non-standard parts of different sizes, ensuring that the non-standard parts do not shift during the pressing process, thereby ensuring the stable operation of the pressing process and providing conditions for continuous production.
[0007] Furthermore, the first driving component includes a linear guide rail mounted on the bottom surface of the top plate. An electric slider slides on the outer side of the linear guide rail, providing a stable sliding track for the electric slider. The electric slider can slide smoothly along the linear guide rail. The cooperation between the two enables the first driving component to stably drive the second driving component to move, ensuring that the second driving component will not deviate during the movement. This ensures that the subsequent pressure plate can accurately align with the pressing position of the non-standard part, improving the accuracy of the pressing position and meeting the different requirements of different non-standard parts for the pressing position.
[0008] Furthermore, the second driving component includes a base mounted on the bottom surface of the electric slider. An electric telescopic rod is mounted on the bottom surface of the base, and the fixing block is mounted on the telescopic end of the electric telescopic rod. The base provides stable mounting support for the electric telescopic rod, ensuring that the electric telescopic rod will not shake during operation. The telescopic end of the electric telescopic rod is connected to the fixing block. The electric telescopic rod can drive the fixing block to move vertically and stably through telescopic movement. The cooperation of the two enables the second driving component to stably drive the fixing block and the pressure plate to move up and down, ensuring a smooth process of the pressure plate applying pressure to non-standard parts and avoiding pressure fluctuations caused by unstable movement, thereby ensuring the pressing quality. At the same time, the telescopic stroke of the electric telescopic rod is adjustable, which can adapt to the pressing requirements of non-standard parts of different thicknesses.
[0009] Furthermore, a rubber plate is installed on the bottom surface of the pressure plate. The rubber plate has a certain degree of elasticity and softness. When the pressure plate contacts the non-standard part through the rubber plate, the rubber plate can buffer the impact force of the pressure plate on the non-standard part, preventing the non-standard part from being damaged due to excessive instantaneous force. At the same time, the rubber plate can increase the friction between the non-standard part and the pressure plate, preventing relative sliding between the non-standard part and the pressure plate during the pressing process, ensuring accurate pressing position. In addition, the rubber plate can also adapt to the slight unevenness of the surface of the non-standard part, so that the pressure is evenly transmitted to the surface of the non-standard part, improving the uniformity of pressing and ensuring the pressing quality.
[0010] Furthermore, the third driving component includes a pair of sliding grooves on the surface of the base, and the pair of sliding grooves are interconnected. Each of the pair of sliding grooves is rotatably connected to a threaded rod, the threads of which are opposite. A coupling connects the pair of threaded rods, and connecting blocks are threadedly engaged on the outer sides of each threaded rod. The connecting blocks slide within the sliding grooves. A handle is provided on the outer side of the base, and the handle is coaxially connected to one of the threaded rods. The pair of sliding grooves provide sliding guidance for the connecting blocks, restricting their movement to the direction of the sliding grooves. The pair of threaded rods with opposite threads are connected by the coupling. Rotating the handle drives the two threaded rods to rotate synchronously. Due to the opposite threads, the two connecting blocks move synchronously in opposite directions along the sliding grooves under the action of the threaded rods, thereby driving the fixing components to move synchronously in opposite directions. This structure enables synchronous adjustment of the fixing components, ensuring uniform clamping force on non-standard parts and preventing non-standard parts from shifting due to uneven clamping force. Simultaneously, the distance between the fixing components can be flexibly adjusted by rotating the handle to adapt to non-standard parts of different sizes, eliminating the need to replace clamping components, reducing adjustment time, and improving production efficiency.
[0011] Furthermore, the fixing component includes a connecting strip, which is installed on the top surface of the connecting block. A pair of rubber strips are installed on each side of the connecting strip that are close to each other. The connecting strip connects the fixing component to the connecting block, enabling the connecting block to drive the fixing component to move stably. The rubber strips on the connecting strip are in direct contact with the non-standard part. The softness of the rubber strips prevents scratches or indentations on the surface of the non-standard part during clamping, protecting its appearance. Simultaneously, the rubber strips increase the friction between the non-standard part and the non-standard part, further enhancing the clamping stability, preventing displacement during pressing, ensuring smooth pressing, and adapting to the clamping requirements of non-standard parts with different materials and surface conditions.
[0012] Furthermore, each of the two sides of the slide grooves has a groove, and a rotating shaft is rotatably connected to each groove via a coil spring. A dustproof strip is wound around the outside of the rotating shaft, and the free end of the dustproof strip is connected to a connecting block. The dustproof strip is the same width as the slide groove and is submerged within the slide groove. The groove provides installation space for the rotating shaft and the dustproof strip. The rotating shaft achieves automatic reset rotation via the coil spring. The dustproof strip is wound around the rotating shaft and its free end is connected to the connecting block. When the connecting block moves, the dustproof strip can be unfolded or retracted with the movement of the connecting block. The dustproof strip is the same width as the slide groove and is submerged within the slide groove, completely covering the opening of the slide groove, effectively preventing dust, debris, and other impurities from entering the slide groove. This avoids impurities affecting the threaded fit between the threaded rod and the connecting block, prevents the connecting block from sliding obstructed within the slide groove, ensures the normal operation of the third driving component, extends the service life of the device, and reduces maintenance frequency and costs.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The non-standard pressing pressure control device, with the cooperation of the first and second driving components, can drive the pressure plate to move flexibly in the horizontal and vertical directions, and the position of the pressure plate can be adjusted to adapt to the pressing position requirements of different non-standard parts without modifying the mechanical structure; the third driving component drives the fixing component to move synchronously in the opposite direction, and can flexibly adjust the clamping distance according to the size of the non-standard parts to adapt to the clamping requirements of non-standard parts of different sizes; the pressure sensor is connected to the pressure plate through the retainer and is electrically connected to the second driving component, which can detect the pressing pressure in real time and provide feedback adjustment, so as to achieve precise control of the pressing pressure required for different non-standard parts, and can adapt to the pressing of non-standard parts with different pressure requirements without changing the pressure head or adjusting the mechanical structure. Attached Figure Description
[0014] Figure 1 This is a first three-dimensional structural schematic diagram of the non-standard pressing pressure control device disclosed in an embodiment of the present utility model; Figure 2 This is a second three-dimensional structural schematic diagram of the non-standard pressing pressure control device disclosed in an embodiment of the present utility model; Figure 3 This is a first cross-sectional structural diagram of the non-standard pressing pressure control device disclosed in an embodiment of the present utility model; Figure 4 This is a second cross-sectional structural diagram of the non-standard pressing pressure control device disclosed in an embodiment of this utility model; Figure 5 for Figure 4 A magnified schematic diagram of structure A in the middle.
[0015] In the diagram: 1. Base; 2. Column; 3. Top plate; 4. Shaft; 5. Dustproof belt; 6. Connecting strip; 7. Rubber strip; 8. Linear guide rail; 9. Electric slider; 10. Machine base; 11. Electric telescopic rod; 12. Fixing block; 13. Rubber plate; 14. Pressure plate; 15. Cage; 16. Pressure sensor; 17. Slide groove; 18. Threaded rod; 19. Connecting block; 20. Coupling; 21. Groove. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figures 1-5This utility model provides a technical solution: a non-standard pressing pressure control device, including a base 1, with columns 2 installed on both sides of the base 1, and a top plate 3 fixed between the columns 2. A first driving component is installed on the bottom surface of the top plate 3, and a second driving component is also provided on the bottom surface of the top plate 3. The first driving component drives the second driving component to move along the long side of the top plate 3. A fixing block 12 is provided above the base 1, and the second driving component drives the fixing block 12 to move vertically. The bottom surface of the fixing block 12 has a cavity, and a pressure sensor 16 is installed on the top surface of the cavity. A pressure plate 14 is suspended inside the cavity. A retainer 15 is mounted on the top surface of the pressure plate 14. The retainer 15 is fixedly connected to the detection end of the pressure sensor 16. The pressure sensor 16 is electrically connected to the second drive component. A pair of fixing members slide on the top surface of the base 1. The pair of fixing members are used to clamp non-standard parts. A third drive component is provided inside the base 1. The third drive component drives the pair of fixing members to move synchronously in opposite directions. First, the non-standard part is placed on the base 1. Then, the third drive component is activated. The third drive component drives the pair of fixing members to move synchronously in opposite directions, so that the fixing parts are clamped. The non-standard part is clamped; then, according to the pressing position requirements of the non-standard part, the first drive is started, and the first drive drives the second drive to move along the long side of the top plate 3. When the second drive moves to the appropriate position, the first drive stops; then the second drive is started again, and the second drive drives the fixing block 12 to move vertically downward. The fixing block 12 drives the pressure plate 14 to move downward synchronously until the pressure plate 14 contacts the non-standard part and applies pressure; during the application of pressure, the pressure plate 14 is subjected to the reaction force of the non-standard part. This reaction force is transmitted to the pressure sensor 16 through the retainer 15. After the pressure sensor 16 detects the pressure signal, it transmits the signal to the second drive; if the detected pressure does not reach the preset value, the second drive continues to drive the fixing block 12 to move downward to increase the pressure. If the detected pressure reaches the preset value, the second drive stops driving and maintains the current pressure to complete the pressing process; after pressing is completed, the second drive drives the fixing block 12 to reset vertically upward, and the third drive drives the fixing block to move in the opposite direction to release the non-standard part. Finally, the pressed non-standard part is removed.
[0018] As an embodiment of this utility model, the first driving member further includes a linear guide rail 8 installed on the bottom surface of the top plate 3. An electric slider 9 slides on the outer side of the linear guide rail 8. When it is necessary to adjust the horizontal position of the second driving member, the electric slider 9 is energized. Under the restriction and guidance of the linear guide rail 8, the electric slider 9 slides along the length direction of the linear guide rail 8. While the electric slider 9 slides, it drives the second driving member connected to it to move synchronously. When the second driving member moves to the horizontal position corresponding to the non-standard part pressing position, the power supply to the electric slider 9 is cut off, and the electric slider 9 stops sliding, thereby realizing the adjustment of the horizontal position of the second driving member.
[0019] As an embodiment of this utility model, the second driving component further includes a base 10 mounted on the bottom surface of the electric slider 9. An electric telescopic rod 11 is mounted on the bottom surface of the base 10, and a fixing block 12 is mounted on the telescopic end of the electric telescopic rod 11. When it is necessary to drive the fixing block 12 to move vertically, the electric telescopic rod 11 is energized, and the telescopic end of the electric telescopic rod 11 begins to extend or retract. When the telescopic end of the electric telescopic rod 11 extends, it pushes the fixing block 12 to move vertically downward, and the fixing block 12 then drives the pressure plate 14 to move downward to approach the non-standard part and apply pressure. When the telescopic end of the electric telescopic rod 11 retracts, it pulls the fixing block 12 to move vertically upward, and the fixing block 12 drives the pressure plate 14 to return to its original position. During the operation of the electric telescopic rod 11, the base 10 is fixed on the electric slider 9, providing stable support for the electric telescopic rod 11, preventing the electric telescopic rod 11 from tilting or shaking during the extension and retraction process, and ensuring that the fixing block 12 and the pressure plate 14 always move in the vertical direction.
[0020] As an embodiment of this utility model, a rubber plate 13 is further installed on the bottom surface of the pressure plate 14. When the second driving member drives the pressure plate 14 to move downward, the rubber plate 13 on the bottom surface of the pressure plate 14 first contacts the surface of the non-standard part. As the pressure plate 14 continues to move downward, the rubber plate 13 undergoes elastic deformation due to the reaction force of the non-standard part. During the deformation process, the rubber plate 13 gradually transmits the pressure applied by the pressure plate 14 to the surface of the non-standard part, while buffering the instantaneous impact of the pressure plate 14 on the non-standard part. Since the rubber plate 13 is in close contact with the surface of the non-standard part and the friction of the rubber material is large, it can limit the horizontal movement of the non-standard part during the pressing process. If there are small protrusions or depressions on the surface of the non-standard part, the elastic deformation of the rubber plate 13 can make it adhere to the surface of the non-standard part, ensuring that the pressure can be evenly distributed in the pressing area of the non-standard part until the pressing process is completed.
[0021] Specifically, the signal output pin of the pressure sensor 16 is connected to the signal input terminal of the main controller of the device through a shielded wire to ensure that the pressure detection signal can be stably transmitted to the controller and avoid signal distortion caused by external electromagnetic interference. The control signal output terminal of the main controller is connected to the drive module of the electric telescopic rod 11 through a wire. The controller can instruct the electric telescopic rod 11 to perform extension, retraction or stop actions by outputting different control signals. Both the pressure sensor 16 and the drive module of the electric telescopic rod 11 are powered by the device's unified DC power supply, and an overload protection element is connected in series in the power supply circuit to prevent damage to both due to voltage fluctuations or excessive load, and to ensure stable power supply to the control circuit.
[0022] Specifically, before the device is started, the operator inputs the target pressing pressure value and pressure deviation threshold required for the non-standard part through the human-machine interface of the controller. The controller stores the preset value in the internal register as the reference for subsequent pressure control. When the electric telescopic rod 11 drives the pressure plate 14 to apply pressure to the non-standard part, the reaction force of the non-standard part on the pressure plate 14 is transmitted to the detection end of the pressure sensor 16 through the retainer 15. The pressure sensor 16 converts the mechanical pressure signal into a corresponding analog electrical signal and transmits it to the main controller in real time. After receiving the analog electrical signal from the pressure sensor 16, the main controller converts the analog signal into a digital signal through the internal AD conversion module and compares it with the preset target pressing pressure value. If the detected pressure is less than (target pressure - deviation threshold), the controller determines that... If the current pressure is insufficient, the controller outputs an extension control signal to the drive module of the electric telescopic rod 11, instructing the electric telescopic rod 11 to continue extending, pushing the pressure plate 14 to further press on the non-standard part until the pressure reaches the target range. If the detected pressure is within the range of (target pressure ± deviation threshold), the controller determines that the pressure meets the requirements and outputs a stop control signal to the drive module. The electric telescopic rod 11 stops extending, maintaining the current extension length, so that the pressure plate 14 maintains the target pressing pressure until the pressing process is completed. If the detected pressure is greater than (target pressure + deviation threshold), the controller determines that the pressure is overloaded and outputs a contraction control signal to the drive module, instructing the electric telescopic rod 11 to contract slightly, reducing the pressure of the pressure plate 14 on the non-standard part until the pressure drops back to the target range, avoiding excessive pressure that could damage the non-standard part or the device.
[0023] As an embodiment of this utility model, the third driving component further includes a pair of sliding grooves 17 disposed on the surface of the base 1, and the pair of sliding grooves 17 are interconnected. Each of the pair of sliding grooves 17 is rotatably connected to a threaded rod 18, the threads of the pair of threaded rods 18 are opposite, and a coupling 20 is connected between the pair of threaded rods 18. A connecting block 19 is threadedly engaged with the outer side of each threaded rod 18, and the connecting block 19 slides within the sliding groove 17. A handle is provided on the outer side of the base 1, and the handle is coaxially connected to one of the threaded rods 18. When it is necessary to clamp non-standard parts, the operator rotates the handle on the outer side of the base 1, and the handle drives one of the threaded rods 18 coaxially connected to it to rotate. The coupling 20 drives another threaded rod 18 to rotate synchronously. Since the threads of the two threaded rods 18 are opposite and the connecting block 19 is threadedly engaged with the threaded rod 18, and the connecting block 19 is restricted from sliding within the slide groove 17, the two connecting blocks 19 will move towards each other along the slide groove 17 under the rotation of the threaded rod 18. When the connecting block 19 moves, it drives the fixed part connected to it to move closer synchronously until the fixed part clamps the non-standard part. When it is necessary to release the non-standard part, the handle is rotated in the opposite direction, and the two threaded rods 18 rotate synchronously in the opposite direction, driving the two connecting blocks 19 to move away from each other along the slide groove 17. The connecting block 19 drives the fixed part to move away synchronously, thereby releasing the non-standard part.
[0024] As an embodiment of this utility model, the fixing member further includes a connecting strip 6, which is installed on the top surface of the connecting block 19. A pair of rubber strips 7 are installed on each side of the connecting strip 6 that are close to each other. When the connecting block 19 moves under the action of the third driving member, the connecting block 19 drives the connecting strip 6 on the top surface to move synchronously, and the connecting strip 6 in turn drives the rubber strip 7 on its inner side to move. When clamping a non-standard part, the connecting strip 6 drives the rubber strip 7 to move closer to the non-standard part until the rubber strip 7 is in close contact with the surface of the non-standard part. As the connecting strip 6 continues to move, the rubber strip 7 is slightly deformed by the pressure of the non-standard part, tightly adhering to the surface of the non-standard part, generating sufficient friction to clamp the non-standard part. During the pressing process, the rubber strip 7 always maintains close contact with the surface of the non-standard part, limiting the movement of the non-standard part through friction, while the properties of the rubber material prevent damage to the surface of the non-standard part.
[0025] As an embodiment of this utility model, further, grooves 21 are provided on both sides of the pair of sliding grooves 17. A rotating shaft 4 is rotatably connected to each groove 21 via a coil spring. A dustproof strip 5 is wound around the outside of the rotating shaft 4. The free end of the dustproof strip 5 is connected to a connecting block 19. The dustproof strip 5 is the same width as the sliding groove 17 and is submerged within the sliding groove 17. When the connecting block 19 moves within the sliding groove 17 in a direction away from the rotating shaft 4, the connecting block 19 pulls the free end of the dustproof strip 5, causing the dustproof strip 5 to gradually unfold from the rotating shaft 4. Simultaneously, the rotating shaft 4 rotates under the pulling force of the dustproof strip 5. The rotation of the rotating shaft 4 causes the coil spring to deform. It stores elastic potential energy; during this process, the unfolded dustproof belt 5 always covers the opening of the slide 17 to prevent impurities from entering the slide 17; when the connecting block 19 moves in the direction close to the rotating shaft 4, the tension of the connecting block 19 on the dustproof belt 5 decreases, the coil spring releases elastic potential energy, and drives the rotating shaft 4 to rotate in the opposite direction, rewinding the dustproof belt 5 onto the rotating shaft 4. The dustproof belt 5 is retracted as the connecting block 19 moves; no matter where the connecting block 19 is in the slide 17, the dustproof belt 5 can maintain the covering state of the opening of the slide 17 under the combined action of the coil spring and the connecting block 19, and continuously play a dustproof role.
[0026] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a control cabinet. The control circuit can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.
Claims
1. A non-standard pressing pressure control device, characterized in that, The system includes a base (1), on both sides of which are mounted columns (2). A top plate (3) is fixed between the columns (2). A first driving component is mounted on the bottom surface of the top plate (3), and a second driving component is also provided on the bottom surface of the top plate (3). The first driving component drives the second driving component to move along the long side of the top plate (3). A fixing block (12) is provided above the base (1). The second driving component drives the fixing block (12) to move vertically. The bottom surface of the fixing block (12) has a cavity, and the top of the cavity... A pressure sensor (16) is installed on the surface of the cavity. A pressure plate (14) is suspended in the cavity. A retainer (15) is installed on the top surface of the pressure plate (14). The retainer (15) and the detection end of the pressure sensor (16) are fixedly connected. The pressure sensor (16) is electrically connected to the second drive member. A pair of fixing members slide on the top surface of the base (1). The pair of fixing members are used to clamp non-standard parts. A third drive member is provided inside the base (1). The third drive member drives the pair of fixing members to move synchronously in opposite directions.
2. The non-standard pressing pressure control device according to claim 1, characterized in that, The first driving component includes a linear guide rail (8) mounted on the bottom surface of the top plate (3), and an electric slider (9) slides on the outer side of the linear guide rail (8).
3. The non-standard pressing pressure control device according to claim 2, characterized in that, The second driving component includes a base (10) mounted on the bottom surface of the electric slider (9), an electric telescopic rod (11) mounted on the bottom surface of the base (10), and a fixing block (12) mounted on the telescopic end of the electric telescopic rod (11).
4. The non-standard pressing pressure control device according to claim 1, characterized in that, A rubber plate (13) is installed on the bottom surface of the pressure plate (14).
5. A non-standard pressing pressure control device according to claim 1, characterized in that, The third driving component includes a pair of sliding grooves (17) on the surface of the base (1), and the pair of sliding grooves (17) are interconnected. A threaded rod (18) is rotatably connected in each of the pair of sliding grooves (17). The threads of the pair of threaded rods (18) are opposite, and a coupling (20) is connected between the pair of threaded rods (18). A connecting block (19) is threadedly engaged on the outer side of each of the threaded rods (18). The connecting block (19) slides in the sliding groove (17). A handle is provided on the outer side of the base (1), and the handle and one of the threaded rods (18) are coaxially connected.
6. A non-standard pressing pressure control device according to claim 5, characterized in that, The fastener includes a connecting strip (6), and the connecting strip (6) is installed on the top surface of the connecting block (19). Each of the connecting strips (6) has a pair of rubber strips (7) installed on its adjacent sides.
7. A non-standard pressing pressure control device according to claim 6, characterized in that, Both sides of the pair of grooves (17) are provided with grooves (21), and a rotating shaft (4) is rotatably connected in the grooves (21) by a coil spring. A dustproof belt (5) is wrapped around the outside of the rotating shaft (4). The free end of the dustproof belt (5) is connected to the connecting block (19). The dustproof belt (5) is the same width as the groove (17) and is submerged in the groove (17).