A glass production down machine

Abstract

This utility model belongs to the field of glass production technology, specifically disclosing a glass unloading machine for glass production. The utility model includes a conveyor belt and a fixed frame. A placement platform is provided on one side of the conveyor belt, and a support plate is fixedly installed on one side of the conveyor belt. A cleaning component is provided on one side of the support plate, and an adsorption component is provided on one side of the fixed frame. The adsorption component includes an adjustment unit and multiple suction cups. The adjustment unit includes a motor, which drives the multiple suction cups to adjust their positions, thereby stably adsorbing glass of different specifications. Through the setting of the adsorption component, adaptive gripping of glass of different specifications can be achieved. The motor-driven adjustment unit can precisely and synchronously adjust the spacing of multiple suction cups to ensure matching with the glass size to form a uniform adsorption force, avoiding glass tilting or breakage due to uneven force, reducing manual intervention, improving unloading efficiency and automation, and significantly enhancing adaptability and reliability.

Description

Technical Field

[0001] This application relates to the field of glass production technology, and more specifically, to a glass cutting machine for glass production. Background Technology

[0002] Glass is an inorganic non-metallic material with the characteristics of transparency, high hardness, and good chemical stability. It is widely used in the fields of construction, home appliances, and automobiles. Glass loading and unloading machines are automated equipment mainly used for loading and unloading glass.

[0003] A search revealed that patent number CN222330959U discloses a glass loading and unloading machine with an anti-collision structure. In this improved loading and unloading machine, the silicone inner layer a and silicone inner layer b act as a soft wrapping for the tempered glass to prevent it from being bumped. The buffer spring in the loading table can absorb the impact force on the tempered glass when unloading, reducing collisions and scratches. The rubber belt at the top of the belt can reduce the impact force generated when the glass is placed by the picking mechanism to avoid bumps.

[0004] While the aforementioned patent achieves the goal of preventing glass from being bumped or knocked, the glass-picking mechanism of the loading and unloading machine uses a single suction cup to pick up the glass. Due to the varying sizes of the glass, the suction area of ​​a single suction cup is limited for large-sized glass, making it difficult to balance the overall force on the glass. This can easily cause the glass to tilt or wobble due to a shift in the center of gravity. Not only is the glass-picking stability poor, but dust or particulate impurities can also adhere to the surface of the glass during production. These impurities can scratch the glass surface during the loading and unloading process, creating defects, and may also affect the seal between the suction cup and the glass, causing the glass to detach. Utility Model Content

[0005] To address the aforementioned problems, this application provides a glass unloading machine for glass production.

[0006] The glass unloading machine for glass production provided in this application adopts the following technical solution: A glass unloading machine for glass production includes a conveyor belt and a fixed frame. A placement platform is provided on one side of the conveyor belt, a support plate is fixedly installed on one side of the conveyor belt, a cleaning component is provided on one side of the support plate, and an adsorption component is provided on one side of the fixed frame. The adsorption assembly includes an adjustment unit and multiple suction cups. The adjustment unit includes a motor, which drives the multiple suction cups to adjust their positions, thereby stably adsorbing glass of different sizes. The cleaning assembly includes multiple high-pressure jet nozzles, which are used to clean the glass surface.

[0007] Furthermore, a cylinder is fixedly installed on one side of the fixed frame, and a limit groove is opened on one side of the fixed frame. A movable frame is slidably connected inside the limit groove, and the output end of the cylinder is fixedly connected to one side of the movable frame.

[0008] Furthermore, a movable plate is provided at the bottom of the movable frame, and two second electric push rods are fixedly installed on one side of the movable frame. The output ends of the two second electric push rods pass through the movable frame and are fixedly connected to the top of the movable plate.

[0009] Furthermore, a base plate is fixedly connected to the bottom of the movable plate. Multiple sliding grooves are opened inside the base plate. A movable seat is connected to the top of each suction cup. Each movable seat is slidably connected to the corresponding sliding groove. A second connecting tube is connected to one side of each movable seat. Each second connecting tube passes through the corresponding movable seat and connects to the corresponding suction cup.

[0010] Furthermore, the motor is fixedly installed on the top of the movable plate. The output end of the motor passes through the movable plate and is fixedly connected to a threaded rod. The bottom end of the threaded rod is rotatably connected to the top of the base plate. A movable ring is threadedly connected to the outer wall of the threaded rod. A connecting frame is provided between each movable seat and the movable ring. The bottom end of each connecting frame is rotatably connected to the corresponding movable seat. The top ends of multiple connecting frames are rotatably connected to the outer wall of the movable ring.

[0011] The above technical solution enables adaptive gripping of glass of different specifications, and can precisely and synchronously adjust the spacing between multiple suction cups to ensure that they match the glass size to form a uniform adsorption force, thus avoiding glass tilting or breakage due to uneven force.

[0012] Furthermore, all suction cups are designed with a double layer.

[0013] The above technical solution not only enhances the adaptability to glass with different surface conditions, but also reduces the risk of glass falling off due to the failure of a single suction cup seal, further improving the safety and stability of the adsorption process.

[0014] Furthermore, multiple high-pressure jet nozzles are fixedly installed on the top of the support plate, and a first connecting pipe is connected to one side of each of the multiple high-pressure jet nozzles.

[0015] The above technical solutions ensure that the glass surface is clean before being gripped by the adsorption component, reducing the problem of poor adsorption or scratches on the glass surface caused by impurities trapped between the suction cup and the glass.

[0016] Furthermore, a first electric push rod is fixedly connected to both sides of the support plate, and a connecting rod is fixedly connected to the output end of each first electric push rod. Multiple fixed wheels are fixedly connected to one side of each connecting rod, and an elastic sleeve is provided on the outer wall of each fixed wheel.

[0017] The above technical solution can center the glass, reducing cleaning blind spots or adsorption misalignment problems caused by glass misalignment.

[0018] In summary, this application includes at least one of the following beneficial technical effects: (1) By setting the adsorption component, this utility model can achieve adaptive gripping of glass of different specifications. The motor-driven adjustment unit can accurately and synchronously adjust the spacing of multiple suction cups to ensure that it matches the size of the glass to form a uniform adsorption force, avoiding the glass from tilting or breaking due to uneven force. Furthermore, the combination of cylinder and second electric push rod drives the suction cup to achieve stable movement in the horizontal and vertical directions, improving the overall motion accuracy and operational stability. At the same time, by combining vacuum adsorption with an adjustable structure, it not only ensures the firmness of gripping, but also achieves stable placement of the glass through precise control of negative pressure, greatly reducing the risk of damage to the glass during the transfer process. It also reduces manual intervention, improves the efficiency of unloading and the degree of automation, and significantly enhances adaptability and reliability. (2) This utility model uses multiple suction cups in a double-layer configuration. The inner suction cup serves as the main adsorption structure, providing core adsorption force through negative pressure to ensure that the glass is firmly gripped. The outer suction cup forms an auxiliary seal, which can effectively prevent external air from seeping in, compensate for local air leakage caused by minor unevenness or stains on the glass surface, and maintain overall negative pressure stability. This structure not only enhances the adaptability to glass with different surface conditions, but also reduces the risk of glass falling off due to the failure of a single suction cup seal, further improving the safety and stability of the adsorption process. (3) This utility model can thoroughly clean the glass surface by using multiple high-pressure jet nozzles, avoiding blind spots in local cleaning, ensuring that the glass surface is clean before being grasped by the adsorption component, reducing the problem of poor adsorption or scratches on the glass surface caused by impurities trapped between the suction cup and the glass, and providing a clean basis for subsequent adsorption and transfer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of the movable plate of this utility model; Figure 4 This is a bottom view of the overall structure of the movable plate of this utility model; Figure 5 For the present utility model Figure 2 Enlarged view of the structure at point A.

[0020] Explanation of reference numerals in the attached drawings: 1. Conveyor belt; 2. Fixed frame; 3. Support plate; 4. First electric push rod; 5. Connecting rod; 6. Fixed wheel; 7. High-pressure jet nozzle; 8. First connecting pipe; 9. Cylinder; 10. Moving frame; 11. Limiting groove; 12. Moving plate; 13. Second electric push rod; 14. Base plate; 15. Suction cup; 16. Slide groove; 17. Moving seat; 18. Motor; 19. Threaded rod; 20. Moving ring; 21. Connecting frame; 22. Second connecting pipe; 23. Placement platform. Detailed Implementation

[0021] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] Reference Figures 1-5 A glass production sheeting machine includes a conveyor belt 1 and a fixed frame 2. A placement platform 23 is provided on one side of the conveyor belt 1, a support plate 3 is fixedly installed on one side of the conveyor belt 1, a cleaning component is provided on one side of the support plate 3, and an adsorption component is provided on one side of the fixed frame 2. The adsorption assembly includes an adjustment unit and multiple suction cups 15. The adjustment unit includes a motor 18, which drives the multiple suction cups 15 to adjust their positions, thereby stably adsorbing glass of different sizes. The cleaning assembly includes a high-pressure jet nozzle 7, and the number of high-pressure jet nozzles 7 is set to multiple, which are used to clean the glass surface.

[0023] Reference Figures 1-5A cylinder 9 is fixedly installed on one side of the fixed frame 2. A limit groove 11 is opened on one side of the fixed frame 2. A movable frame 10 is slidably connected inside the limit groove 11. The output end of the cylinder 9 is fixedly connected to one side of the movable frame 10. A movable plate 12 is provided at the bottom of the movable frame 10. Two second electric push rods 13 are fixedly installed on one side of the movable frame 10. The output ends of the two second electric push rods 13 pass through the movable frame 10 and are fixedly connected to the top of the movable plate 12. A base plate 14 is fixedly connected to the bottom of the movable plate 12. Multiple sliding grooves 16 are opened inside the base plate 14. A movable seat 17 is connected to the top of each suction cup 15. Each movable seat 17 is connected to a corresponding sliding groove. 16. A sliding connection is provided. Each movable seat 17 is connected to a second connecting pipe 22 on one side. Each second connecting pipe 22 passes through the corresponding movable seat 17 and is connected to the corresponding suction cup 15. The motor 18 is fixedly installed on the top of the movable plate 12. The output end of the motor 18 passes through the movable plate 12 and is fixedly connected to a threaded rod 19. The bottom end of the threaded rod 19 is rotatably connected to the top of the base plate 14. The outer wall of the threaded rod 19 is threadedly connected to a movable ring 20. Each movable seat 17 and the movable ring 20 are provided with a connecting frame 21. The bottom end of each connecting frame 21 is rotatably connected to the corresponding movable seat 17. The top ends of multiple connecting frames 21 are rotatably connected to the outer wall of the movable ring 20.

[0024] The adsorption assembly enables multiple suction cups 15 to adsorb glass evenly and can adsorb glass of different sizes. Specifically, when the conveyor belt 1 transports the glass to the designated position, the equipment control system first triggers the adjustment unit to work. After receiving the start signal, the motor 18 starts running, and its output shaft drives the threaded rod 19 that passes through the moving plate 12 to rotate synchronously. Since the bottom end of the threaded rod 19 is rotatably connected to the top of the base plate 14, and the moving ring 20 connected to the outer wall is constrained by the connecting frame 21 and cannot rotate with the threaded rod 19, the moving ring 20 will move up and down along the axis of the threaded rod 19. When the moving ring 20 moves, the multiple connecting frames 21 rotatably connected to its outer wall drive the corresponding moving seats 17 respectively, so that each moving seat 17 slides synchronously along the slide groove 16 in the base plate 14 (when the moving ring 20 descends, the connecting frame 21 pushes the moving seats 17 away from each other, increasing the distance; when the moving ring 20 rises, the connecting frame 21 pulls the moving seats 17 closer to each other, decreasing the distance), until the distance between the multiple suction cups 15 matches the size of the glass to be adsorbed. Then the motor 18 stops running and locks its position. After the spacing adjustment is completed, the control system issues a command to start cylinder 9. The piston rod of cylinder 9 extends and retracts under air pressure, driving the movable frame 10 fixedly connected to it to slide horizontally along the limiting groove 11 of the fixed frame 2, and moving the suction cup 15 as a whole to be directly above the glass on the conveyor belt 1. After it is in place, cylinder 9 stops moving and maintains its current position. Then, the control system triggers the two second electric push rods 13 to start. Their output ends pass through the movable frame 10 and push the movable plate 12, the base plate 14 and the suction cup 15 downward as a whole until all the suction cups 15 are tightly attached to the glass surface. At this time, the second electric push rods 13 stop extending and maintain the thrust. Subsequently, the control system activates the vacuum system, and the second connecting pipe 22 (the other end of which is connected to the vacuum system) connected to each suction cup 15 via the moving base 17 begins to extract air, creating a negative pressure inside the suction cup 15. Under the action of external atmospheric pressure, the glass is firmly adsorbed. Since the spacing has been adjusted to the appropriate specifications, multiple suction cups 15 can be evenly stressed, preventing the glass from tilting or falling off. When the glass needs to be transferred to the placement platform 23, the control system commands the second electric push rod 13 to retract. The push rod drives the suction cup 15, which is holding the glass, to rise to a safe height and then stops. Then, the cylinder 9 starts again, driving the moving frame 10 to slide along the limiting groove 11, transferring the glass to directly above the placement platform 23. After it reaches the designated position, the cylinder 9 stops again. Then, the second electric push rod 13 starts again and extends, causing the glass to slowly approach the surface of the placement platform 23 and stop when it reaches the designated height. Finally, the control system shuts down the vacuum system and introduces a small amount of air through the second connecting pipe 22 to break the vacuum environment between the suction cup 15 and the glass. The suction cup 15 loses its adsorption force, and the glass is placed stably on the placement platform 23 under the action of gravity, completing one adsorption and transfer process. All components are reset and await the next command.

[0025] By setting up the adsorption components, adaptive gripping of glass of different specifications can be achieved. The adjustment unit driven by the motor 18 can precisely and synchronously adjust the spacing of multiple suction cups 15 to ensure that they match the glass size and form a uniform adsorption force, avoiding glass tilting or breakage due to uneven force. Furthermore, the combined drive of the cylinder 9 and the second electric push rod 13 enables the suction cups 15 to move stably in the horizontal and vertical directions. With the guiding effect of the limiting groove 11 and the slide 16, the overall motion accuracy and operational stability are improved. At the same time, the vacuum adsorption method combined with the adjustable structure ensures the firmness of the grip and enables the glass to be placed stably through the precise control of negative pressure, which greatly reduces the risk of glass damage during the transfer process. It also reduces manual intervention, improves the efficiency of unloading and the degree of automation, and significantly enhances adaptability and reliability.

[0026] Reference Figure 4 The multiple suction cups 15 are all arranged in a double layer.

[0027] By employing a double-layered design with multiple suction cups 15, the inner suction cup 15 serves as the main adsorption structure, providing core adsorption force through negative pressure to ensure a firm grip on the glass. The outer suction cup 15 forms an auxiliary seal, effectively preventing external air from seeping in and compensating for localized air leakage caused by minor unevenness or stains on the glass surface, thus maintaining overall negative pressure stability. This structure not only enhances adaptability to glass with different surface conditions but also reduces the risk of glass detachment caused by the failure of a single suction cup 15 seal, further improving the safety and stability of the adsorption process.

[0028] Reference Figure 1 and Figure 2 Multiple high-pressure jet nozzles 7 are fixedly installed on the top of the support plate 3, and a first connecting pipe 8 is connected to one side of each of the multiple high-pressure jet nozzles 7.

[0029] The high-pressure jet nozzles 7 can be used to clean the glass surface. Specifically, when the conveyor belt 1 transports the glass to the corresponding position of the support plate 3, the equipment control system simultaneously starts the high-pressure air source (such as an air compressor). Compressed air is transported to multiple high-pressure jet nozzles 7 through the first connecting pipe 8. The high-pressure airflow ejected from the jet nozzles forms a dense air curtain, which blows vertically or obliquely onto the glass surface, using the impact force of the airflow to remove dust, debris and tiny impurities attached to the glass surface.

[0030] Multiple high-pressure jet nozzles 7 can thoroughly clean the glass surface, avoiding blind spots in localized cleaning and ensuring that the glass surface is clean before being grasped by the adsorption component. This reduces the problem of poor adsorption or scratches on the glass surface caused by impurities trapped between the suction cup 15 and the glass, providing a clean foundation for subsequent adsorption and transfer.

[0031] Reference Figure 2 and Figure 5 Both sides of the support plate 3 are fixedly connected to a first electric push rod 4. The output end of each first electric push rod 4 is fixedly connected to a connecting rod 5. Each connecting rod 5 is fixedly connected to a plurality of fixed wheels 6 on one side. Each fixed wheel 6 has an elastic sleeve on its outer wall.

[0032] The glass can be centered by setting two sets of fixed wheels 6. Specifically, when the conveyor belt 1 transports the glass to the cleaning station of the support plate 3, the equipment control system simultaneously activates the first electric push rods 4 on both sides. The output end of the first electric push rod 4 extends horizontally and drives the connecting rod 5 fixed to it to move closer to the glass. This causes the multiple fixed wheels 6 on one side of the connecting rod 5 to gradually approach the two edges of the glass. Since the two sets of fixed wheels 6 advance synchronously from the left and right sides of the glass, and the elastic sleeve on the outer wall of each fixed wheel 6 directly contacts the edge of the glass, it avoids damage to the edge of the glass from rigid collisions and allows for fine adjustment of the glass position through the friction of the elastic sleeve. When the two fixed wheels 6 are fully in contact with the edge of the glass, the glass is guided to the central axis position of the conveyor belt 1 under the action of bidirectional thrust, achieving precise centering. After centering is completed, the first electric push rod 4 drives the fixed wheels 6 to retract synchronously, avoiding obstruction of the glass from being transported to the gripping position of the adsorption component.

[0033] The two sets of fixed wheels 6 can adapt to glass of different widths and ensure a smooth and damage-free centering process. This provides a centering reference for the subsequent comprehensive cleaning by the high-pressure jet nozzle 7 and the precise gripping by the adsorption component, reducing cleaning blind spots or adsorption misalignment caused by glass displacement.

[0034] The control system, vacuum system, and air compressor mentioned above are all common technologies in this field and are existing technologies, and are not shown in the figure.

[0035] Working principle: After the conveyor belt 1 transports the glass to the designated position, the equipment control system first triggers the adjustment unit to work. After receiving the start signal, the motor 18 starts running, and its output shaft drives the threaded rod 19 that passes through the moving plate 12 to rotate synchronously. Since the bottom end of the threaded rod 19 is rotatably connected to the top of the base plate 14, and the moving ring 20 connected by the thread on the outer wall is constrained by the connecting frame 21 and cannot rotate with the threaded rod 19, the moving ring 20 will move up and down along the axis of the threaded rod 19. When the moving ring 20 moves, the multiple connecting frames 21 rotatably connected by its outer wall drive the corresponding moving seats 17 respectively, so that each moving seat 17 slides synchronously along the slide groove 16 in the base plate 14 (when the moving ring 20 descends, the connecting frame 21 pushes the moving seats 17 away from each other, and the distance increases; when the moving ring 20 rises, the connecting frame 21 pulls the moving seats 17 closer to each other, and the distance decreases), until the distance between the multiple suction cups 15 matches the size of the glass to be adsorbed. Then the motor 18 stops running and locks in position. After the spacing adjustment is completed, the control system issues a command to start cylinder 9. The piston rod of cylinder 9 extends and retracts under air pressure, driving the movable frame 10 fixedly connected to it to slide horizontally along the limiting groove 11 of the fixed frame 2, and moving the suction cup 15 as a whole to be directly above the glass on the conveyor belt 1. After it is in place, cylinder 9 stops moving and maintains its current position. Then, the control system triggers the two second electric push rods 13 to start. Their output ends pass through the movable frame 10 and push the movable plate 12, the base plate 14 and the suction cup 15 downward as a whole until all the suction cups 15 are tightly attached to the glass surface. At this time, the second electric push rods 13 stop extending and maintain the thrust. Subsequently, the control system activates the vacuum system, and the second connecting pipe 22 (the other end of which is connected to the vacuum system) connected to each suction cup 15 via the moving base 17 begins to extract air, creating a negative pressure inside the suction cup 15. Under the action of external atmospheric pressure, the glass is firmly adsorbed. Since the spacing has been adjusted to the appropriate specifications, multiple suction cups 15 can be evenly stressed, preventing the glass from tilting or falling off. When the glass needs to be transferred to the placement platform 23, the control system commands the second electric push rod 13 to retract. The push rod drives the suction cup 15, which is holding the glass, to rise to a safe height and then stops. Then, the cylinder 9 starts again, driving the moving frame 10 to slide along the limiting groove 11, transferring the glass to directly above the placement platform 23. After it reaches the designated position, the cylinder 9 stops again. Then, the second electric push rod 13 starts again and extends, causing the glass to slowly approach the surface of the placement platform 23 and stop when it reaches the designated height. Finally, the control system shuts down the vacuum system and introduces a small amount of air through the second connecting pipe 22 to break the vacuum environment between the suction cup 15 and the glass. The suction cup 15 loses its adsorption force, and the glass is placed stably on the placement platform 23 under the action of gravity, completing one adsorption and transfer process. All components are reset and await the next command.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A glass production down machine comprising a conveyor belt (1) and a fixed frame (2), characterized in that, A placement platform (23) is provided on one side of the conveyor belt (1), a support plate (3) is fixedly installed on one side of the conveyor belt (1), a cleaning component is provided on one side of the support plate (3), and an adsorption component is provided on one side of the fixing frame (2). The adsorption assembly includes an adjustment unit and multiple suction cups (15). The adjustment unit includes a motor (18), which drives the multiple suction cups (15) to adjust their positions, thereby stably adsorbing glass of different specifications. The cleaning assembly includes a high-pressure jet nozzle (7), and the number of the high-pressure jet nozzle (7) is set to multiple, which are used to clean the glass surface.

2. The glass sheet delivery device of claim 1, wherein: A cylinder (9) is fixedly installed on one side of the fixed frame (2). A limit groove (11) is opened on one side of the fixed frame (2). A movable frame (10) is slidably connected inside the limit groove (11). The output end of the cylinder (9) is fixedly connected to one side of the movable frame (10).

3. The glass production down-draw machine of claim 2, wherein: The bottom of the movable frame (10) is provided with a movable plate (12). Two second electric push rods (13) are fixedly installed on one side of the movable frame (10). The output ends of the two second electric push rods (13) pass through the movable frame (10) and are fixedly connected to the top of the movable plate (12).

4. The glass sheet delivery device of claim 3, wherein: The bottom of the movable plate (12) is fixedly connected to a base plate (14). The base plate (14) has multiple sliding grooves (16) inside. Each suction cup (15) is connected to a movable seat (17) at its top. Each movable seat (17) is slidably connected to the corresponding sliding groove (16). Each movable seat (17) is connected to a second connecting pipe (22) on one side. Each second connecting pipe (22) passes through the corresponding movable seat (17) and is connected to the corresponding suction cup (15).

5. The glass production down-draw apparatus of claim 4, wherein: The motor (18) is fixedly installed on the top of the movable plate (12). The output end of the motor (18) passes through the movable plate (12) and is fixedly connected to a threaded rod (19). The bottom end of the threaded rod (19) is rotatably connected to the top of the base plate (14). The outer wall of the threaded rod (19) is threadedly connected to a movable ring (20). Each movable seat (17) and the movable ring (20) are provided with a connecting frame (21). The bottom end of each connecting frame (21) is rotatably connected to the corresponding movable seat (17). The top ends of multiple connecting frames (21) are rotatably connected to the outer wall of the movable ring (20).

6. The glass production down-draw apparatus of claim 1, wherein: All of the suction cups (15) are arranged in a double layer.

7. The glass sheet delivery device of claim 1, wherein: Multiple high-pressure jet nozzles (7) are fixedly installed on the top of the support plate (3), and a first connecting pipe (8) is connected to one side of each of the multiple high-pressure jet nozzles (7).

8. The glass production down-draw apparatus of claim 1, wherein: Both sides of the support plate (3) are fixedly connected to a first electric push rod (4), and the output end of each first electric push rod (4) is fixedly connected to a connecting rod (5). Each side of each connecting rod (5) is fixedly connected to a plurality of fixed wheels (6), and the outer wall of each fixed wheel (6) is provided with an elastic sleeve.

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