Knurling machine for producing seawater purification filter screen

Abstract

The present application relates to knurling machine field, disclose a kind of knurling machine for seawater purification filter screen production, including workbench and the mounting bracket of fixed connection on workbench, knurling roller is rotatably connected between mounting bracket by drive shaft, the both sides of workbench are equipped with the quick fixing assembly for being used to fix filter screen plate;Quick fixing assembly includes the support frame of fixed connection on the both sides of workbench, and support frame is fixedly connected between with slide bar, support frame is also rotatably connected with screw rod between, and one end of screw rod penetrates support frame and is fixedly connected with hand wheel, the outside of slide bar and screw rod is movably connected with slide, and storage cavity is arranged in the inside of slide;Realize the transverse and longitudinal clamping and fixing of filter screen plate simultaneously, and immediately complete locking after clamping, while realizing knurling operation guarantee filter screen plate conveying stability, improve the efficiency of filter screen plate fixation, improve the quality and efficiency of filter screen knurling.

Description

Technical Field

[0001] This invention relates to the field of knurling machine technology, and more specifically, to a knurling machine for producing seawater purification filter screens. Background Technology

[0002] Seawater contains a large amount of seaweed, fish, shrimp, plastic bags, silt and other debris. Therefore, in the process of seawater purification, it is necessary to use a filter screen to filter these impurities to prevent them from clogging the equipment. During production, filter screens are typically knurled. This knurling process creates regular tooth-like or mesh-like patterns on the filter screen's surface, preventing slippage or displacement during installation or use. This is especially suitable for high-flow-rate or vibrating environments. Furthermore, the knurled material is shaped rather than removed, which helps enhance local rigidity and reduces the risk of deformation under high pressure differentials. In some industrial filtration equipment, the knurled patterns can guide the fluid to pass evenly through the filter medium, avoiding localized scouring or clogging and improving filtration efficiency.

[0003] However, during the knurling process, the filter plate is prone to displacement due to compression. Therefore, it is necessary to fix the filter plate when knurling. The traditional fixing method involves clamping the plate from both sides with a clamp, and it is also necessary to ensure that the horizontal conveying of the plate is not affected. At the same time, the plate must be fixed in the vertical direction to prevent the plate from shifting up and down. The operation is very cumbersome, especially when knurling plates of different thicknesses and widths, which takes a lot of time for fixing and adjustment, seriously reducing the efficiency of filter screen knurling operation. Summary of the Invention

[0004] This invention provides a knurling machine for producing seawater purification filter screens, solving the technical problem in related technologies where the cumbersome operation of fixing the filter screen sheet during knurling reduces knurling efficiency.

[0005] This invention provides a knurling machine for producing seawater purification filter screens, including a workbench and mounting frames fixedly connected to the workbench. Knurling rollers are rotatably connected between the mounting frames via drive shafts. Both sides of the workbench are provided with quick-fixing components for fixing the filter screen sheet. The quick-fixing assembly includes support frames fixedly connected to both sides of the workbench, with a slide rod fixedly connected between the support frames. A lead screw is also rotatably connected between the support frames, with one end of the lead screw passing through the support frame and fixedly connected to a handwheel. The slide rod and the lead screw are movably connected to a slide block. A storage cavity is opened inside the slide block, and a lifting column is slidably connected inside the storage cavity. A fixed seat is rotatably connected to the top of the lifting column. A push switch is provided at the upper end of the slide block. The storage cavity is filled with an electrorheological fluid electrically connected to the push switch.

[0006] As a further optimization of the present invention, the lifting column is a hollow column with an opening at the lower end, and a first spring is fixedly connected between the lower end of the lifting column and the storage cavity. The elastic force of the first spring is greater than the pressure required to trigger the push switch. The lower edge of the fixed seat is rounded, and a limiting block is provided at the top of the lifting column.

[0007] As a further optimization of the present invention, a spraying assembly is provided on the outside of the fixed base. The spraying assembly includes a ball bearing movably embedded in the bottom of the fixed base. A storage bladder is fixedly connected to the top of the fixed base. A movable groove is opened inside the fixed base, and a pusher is slidably connected inside the movable groove. A second spring is fixedly connected between the upper part of the pusher and the movable groove. The interior of the storage bladder is divided into multiple cavities by a fixedly connected partition, and the cavities are filled with lubricating oil. A pressure valve is provided on the circumferential side of the storage bladder.

[0008] As a further optimization of the present invention, the workbench is provided with a smoothing and cleaning component on both sides. The smoothing and cleaning component includes a connecting arm that is rotatably connected by a coil spring shaft, and a smoothing roller is rotatably connected between the connecting arms.

[0009] As a further optimization of the present invention, a collection box is fixedly connected between the connecting arms, and a scraper is fixedly connected to the side of the collection box near the sizing roller. The side of the collection box near the sizing roller has a recess that matches the sizing roller, and the surface of the recess has an opening that communicates with the inside of the collection box.

[0010] As a further optimization of the present invention, the workbench is provided with stable conveying components on both sides. The stable conveying components include conveying grooves opened on both sides of the workbench, and rollers are rotatably connected inside the conveying grooves. The surface of the rollers is provided with grooves, and suction cups are movably connected inside the grooves. A top column is fixedly connected to one end of the suction cups near the rollers, and an airbag ball is movably connected inside the rollers.

[0011] As a further optimization of the present invention, the suction cup extends to the outside of the groove in the initial state, and the elasticity of the airbag ball is greater than the resistance encountered when the top column slides.

[0012] As a further optimization of the present invention, the surface of the mounting bracket is provided with a cooling component, the cooling component includes a vent on the surface of the mounting bracket, and a fan is rotatably connected inside the vent. A first toothed ring is fixedly connected to the outside of the fan, and a second toothed ring is fixedly connected to the outside of the drive shaft, and the second toothed ring meshes with the first toothed ring.

[0013] The beneficial effects of this invention are as follows: 1. The knurling machine for producing seawater purification filter screens according to the present invention, under the guidance of the rounded corners at the bottom edge of the fixed seat, allows the filter screen sheet to be inserted into the bottom of the fixed seat until it contacts the lifting column, thereby completing the lateral clamping of the filter screen sheet. During the insertion of the filter screen sheet into the bottom of the fixed seat, the fixed seat is lifted upward, causing the fixed seat to drive the lifting column to move upward along the storage cavity and pull the first spring to extend, so that the fixed seat clamps the filter screen sheet from the top with the sliding seat. In addition, when the filter screen sheet contacts the lifting column, it also squeezes and presses the switch to energize the electrorheological fluid inside the storage cavity. The energized electrorheological fluid hardens rapidly, fixing the lifting column and locking the fixed seat. This achieves simultaneous lateral and longitudinal clamping and fixing of the filter screen sheet, and immediate locking after clamping. While ensuring stable conveying of the filter screen sheet during the knurling operation, it improves the fixing efficiency of the filter screen sheet and enhances the quality and efficiency of filter screen knurling.

[0014] 2. The knurling machine for producing seawater purification filter screens according to the present invention involves the ball bearings at the bottom of the fixed base being compressed and contracted into the interior of the fixed base by the filter screen plate, causing the pushing member to move upward. When the pushing member moves upward, it compresses the second spring and the storage bladder, thereby compressing the multiple cavities in the storage bladder that are divided by partitions. This increases the internal pressure of the cavities, which in turn forces the lubricating oil stored in the cavities to be squeezed out through the pressure valve. The sprayed lubricating oil covers the surface of the filter screen plate, increasing the lubrication of the filter screen plate surface, reducing the friction caused by direct contact between the knurling roller and the filter screen plate, reducing radial pressure, preventing random patterns or unclear patterns, and the lubricating oil can absorb and carry away some heat, avoiding local overheating of the knurling roller and the filter screen plate, which could lead to deformation or annealing, thus ensuring the knurling quality of the filter screen.

[0015] 3. The knurling machine for producing seawater purification filter screens described in this invention utilizes the elastic force applied to the connecting arm by the coiled spring shaft to generate downward pressure on the spreading roller. This causes the spreading roller to press the filter screen material from top to bottom, improving the stability of the filter screen material during conveying. Simultaneously, as the filter screen material contacts the spreading roller, friction drives the spreading roller to rotate, allowing it to evenly spread the lubricating oil sprayed on the filter screen material. This ensures that the lubricating oil fully covers the surface of the filter screen material, improving the quality of the knurling process. Furthermore, because the lubricating oil covers the filter screen material... After surface treatment, the increased moisture content of impurities on the filter screen effectively removes the electrostatic adsorption capacity of impurities. This allows the wiping roller to wipe away impurities adhering to the filter screen surface while spreading the lubricating oil evenly, reducing the chance of knurling caused by impurities. As the wiping roller rotates, the area that was originally in contact with the filter screen rotates to the collection box position. With the help of the rotational force and the action of the scraper, the impurities and lubricating fluid adhering to the surface of the wiping roller are scraped into the collection box, achieving self-cleaning of the wiping roller. This ensures the wiping roller effectively cleans the surface of the filter screen and spreads the lubricating oil evenly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the quick-fixing component of the present invention; Figure 3 This is a schematic cross-sectional view of the slide block structure of the present invention; Figure 4 This is a view of the slide and push switch of the present invention combined; Figure 5 This is a schematic diagram of the spraying component structure of the present invention; Figure 6 This is a partial structural diagram of the stable delivery component of the present invention; Figure 7 This is a partial structural diagram of the cleaning and spreading component of the present invention; Figure 8 This is a partial structural diagram of the cooling component of the present invention.

[0017] In the picture: 10. Worktable; 11. Mounting bracket; 12. Drive shaft; 13. Knurling roller; 20. Quick-fixing assembly; 21. Support frame; 22. Slide rod; 23. Slide base; 24. Lead screw; 25. Handwheel; 26. Storage cavity; 27. Lifting column; 28. First spring; 29. ​​Fixing base; 210. Push switch; 30. Spraying assembly; 31. Ball bearing; 32. Movable groove; 33. Pushing component; 34. Second spring; 35. Storage bladder; 36. Divider; 37. Pressure valve; 40. Stable conveying assembly; 41. Conveying trough; 42. Roller; 43. Groove; 44. Suction cup; 45. Top column; 46. Airbag ball; 50. Blending and cleaning component; 51. Connecting arm; 52. Blending roller; 53. Collection box; 54. Scraper; 60. Cooling component; 61. Ventilation opening; 62. Fan; 63. First toothed ring; 64. Second toothed ring. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] like Figures 1 to 4 As shown in the figure, a knurling machine for producing seawater purification filter screen according to an embodiment of the present invention includes a workbench 10 and a mounting frame 11 fixedly connected to the workbench 10. Knurling rollers 13 are rotatably connected between the mounting frames 11 via a drive shaft 12. Both sides of the workbench 10 are provided with quick fixing components 20 for fixing the filter screen material. The quick-fixing assembly 20 includes support frames 21 fixedly connected to both sides of the workbench 10, and a slide rod 22 fixedly connected between the support frames 21. A lead screw 24 is also rotatably connected between the support frames 21, and one end of the lead screw 24 passes through the support frame 21 and is fixedly connected to a handwheel 25. The slide rod 22 and the lead screw 24 are movably connected to a slide block 23. A storage cavity 26 is opened inside the slide block 23, and a lifting column 27 is slidably connected inside the storage cavity 26. A fixed seat 29 is rotatably connected to the top of the lifting column 27. A push switch 210 is provided at the upper end of the slide block 23. The storage cavity 26 is filled with an electrorheological fluid electrically connected to the push switch 210. The lifting column 27 is a hollow column with an opening at the lower end, and a first spring 28 is fixedly connected between the lower end of the lifting column 27 and the storage cavity 26. The elastic force of the first spring 28 is greater than the pressure required to trigger the push switch 210. The lower edge of the fixed seat 29 is rounded, and a limit block is provided at the top of the lifting column 27.

[0020] It should be noted that, firstly, the distance between the two knurling rollers 13 is adjusted according to the required thickness of the knurled filter screen material. Then, the filter screen material is placed on the slide block 23. Next, the handwheel 25 is turned, which drives the lead screw 24 to rotate, thereby applying a rotational force to the slide block 23. Since the slide block 23 is restricted by the slide rod 22 and cannot rotate, it can only move horizontally along the surface of the slide rod 22, causing the fixed seats 29 on the slide block 23 to move closer to each other. As the fixed seats 29 move, when they contact the filter screen material, the filter screen material is inserted into the bottom of the fixed seat 29 under the guidance of the rounded corners at the bottom edge of the fixed seat 29, until the filter screen material contacts the lifting column 27, thus completing the lateral clamping of the filter screen material. During the process of the filter screen material being inserted into the bottom of the fixed seat 29, the fixed seat 29 is lifted upward, causing the fixed seat 29 to drive the lifting column 27 to move upward along the storage cavity 26 and pull the first spring 28 to extend, so that the fixed seat 29 moves from the top of the filter screen material. The filter screen is clamped by the slide 23. Additionally, when the filter screen contacts the lifting column 27, the switch 210 is pressed, energizing the electrorheological fluid inside the storage chamber 26. The energized fluid quickly hardens, fixing the lifting column 27 and locking the fixing seat 29. This achieves simultaneous horizontal and vertical clamping and fixing of the filter screen, with immediate locking after clamping. While ensuring stable conveying of the filter screen during knurling, this improves the fixing efficiency and enhances the quality and efficiency of the knurling process. The filter screen is then pushed between the two knurling rollers 13. Driven by a motor, the knurling rollers 13 perform knurling on the filter screen. As the filter screen continues to move, the knurled filter screen moves to the slide 23 on the other side of the worktable 10 and is clamped by the fixing seat 29 and the lifting column 27. This fixation from both ends further improves the stability of the filter screen during knurling and ensures the quality of the knurling process.

[0021] like Figure 5 As shown, a spraying assembly 30 is provided on the outside of the fixed base 29. The spraying assembly 30 includes a ball bearing 31 movably embedded in the bottom of the fixed base 29. A storage bladder 35 is fixedly connected to the top of the fixed base 29. A movable groove 32 is opened inside the fixed base 29, and a pusher 33 is slidably connected inside the movable groove 32. A second spring 34 is fixedly connected between the upper part of the pusher 33 and the movable groove 32. The inside of the storage bladder 35 is divided into multiple cavities by a fixedly connected partition 36, and the cavities are filled with lubricating oil. A pressure valve 37 is provided on the circumferential side of the storage bladder 35.

[0022] It should be noted that during the knurling process, as the filter screen plate moves, the friction causes the fixed seat 29 to rotate on the surface of the lifting column 27. When the fixed seat 29 rotates, the area at its bottom that was not originally in contact with the filter screen plate rotates to the top of the filter screen plate. This causes the ball bearings 31 at the bottom of the fixed seat 29 to be squeezed and contracted into the interior of the fixed seat 29 by the filter screen plate, and causes the pushing member 33 to move upward. When the pushing member 33 moves upward, it squeezes the second spring 34 and the storage bladder 35 to contract, thereby contracting the multiple cavities in the storage bladder 35 that are separated by the partition 36. This increases the internal pressure of the cavities, which in turn squeezes out the lubricating oil stored in the cavities through the pressure valve 37. The sprayed lubricating oil covers the surface of the filter screen plate, increasing the lubrication of the filter screen plate surface, reducing the friction generated by the direct contact between the knurling roller 13 and the filter screen plate, reducing radial pressure, preventing random patterns or unclear patterns, and the lubricating oil can absorb and carry away some heat, avoiding local overheating of the knurling roller 13 and the filter screen plate, which could lead to deformation or annealing, thus ensuring the knurling quality of the filter screen.

[0023] like Figure 1 and Figure 7 As shown, the workbench 10 is provided with a smoothing and cleaning assembly 50 on both sides. The smoothing and cleaning assembly 50 includes a connecting arm 51 rotatably connected by a coil spring shaft, and a smoothing roller 52 is rotatably connected between the connecting arms 51. A collection box 53 is fixedly connected between the connecting arms 51, and a scraper 54 is fixedly connected to the side of the collection box 53 near the smearing roller 52. The side of the collection box 53 near the smearing roller 52 has a recess that matches the smearing roller 52, and the surface of the recess has an opening that communicates with the inside of the collection box 53.

[0024] It should be noted that, firstly, the elastic force applied to the connecting arm 51 by the coil spring shaft causes the smoothing roller 52 to generate downward pressure, prompting the smoothing roller 52 to press the filter screen material from top to bottom, improving the stability of the filter screen material during conveying. Simultaneously, as the filter screen material contacts the smoothing roller 52, friction drives the smoothing roller 52 to rotate, causing it to evenly spread the lubricating oil sprayed on the filter screen material. This ensures the lubricating oil fully covers the surface of the filter screen material, improving the quality of the knurling process. Furthermore, the lubricating oil covering the surface of the filter screen material increases the filtration efficiency. The moisture content of impurities on the surface of the filter screen effectively removes the electrostatic adsorption capacity of impurities. This allows the wiping roller 52 to wipe away impurities adhering to the surface of the filter screen while spreading the lubricating oil evenly, reducing the chance of knurling caused by impurities. As the wiping roller 52 rotates, the area that was originally in contact with the filter screen rotates to the position of the collection box 53. With the help of the rotational force and the action of the scraper 54, the impurities and lubricating liquid adhering to the surface of the wiping roller 52 are scraped into the collection box 53, achieving self-cleaning of the wiping roller 52. This ensures the effectiveness of the wiping roller 52 in cleaning the surface of the filter screen and spreading the lubricating oil evenly.

[0025] like Figure 1 and Figure 6 As shown, the workbench 10 is provided with stable conveying components 40 on both sides. The stable conveying components 40 include conveying grooves 41 opened on both sides of the workbench 10, and a roller 42 is rotatably connected inside the conveying grooves 41. A groove 43 is opened on the surface of the roller 42, and a suction cup 44 is movably connected inside the groove 43. A top column 45 is fixedly connected to one end of the suction cup 44 near the roller 42. An airbag ball 46 is movably connected inside the roller 42. In the initial state, the suction cup 44 extends to the outside of the groove 43, and the elasticity of the airbag ball 46 is greater than the resistance encountered when the top column 45 slides.

[0026] It should be noted that, in the initial state, the suction cup 44 extends above the conveying groove 41 under the push of the airbag ball 46. As the filter screen material is conveyed, when the filter screen material is conveyed to the pressing area of ​​the two knurling rollers 13, the filter screen material comes into contact with the suction cup 44. Under the action of the filter screen material's own gravity, it presses the suction cup 44 on the surface of the roller 42 inside the conveying groove 41, so that the suction cup 44 is adsorbed on the surface of the filter screen material. Then, the roller 42 is driven by the motor to rotate at the same speed as the conveying speed of the filter screen material, so that when the filter screen material enters between the two knurling rollers 13 for knurling, it is always adsorbed by the suction cup 44 and adheres to the surface of the worktable 10, which improves the stability of the filter screen material at the moment of contact with the knurling rollers 13, prevents the filter screen material from deviating, and further improves the stability of the filter screen during knurling.

[0027] like Figure 1 and Figure 8As shown, the surface of the mounting bracket 11 is provided with a cooling component 60. The cooling component 60 includes a vent 61 opened on the surface of the mounting bracket 11, and a fan 62 is rotatably connected inside the vent 61. A first toothed ring 63 is fixedly connected to the outside of the fan 62, and a second toothed ring 64 is fixedly connected to the outside of the drive shaft 12, and the second toothed ring 64 meshes with the first toothed ring 63.

[0028] It should be noted that since the lower knurling roller 13 is located at the bottom of the workbench 10, its heat dissipation effect is affected, resulting in a large difference in heat dissipation efficiency between the two knurling rollers 13. This can easily lead to an excessive difference in knurling on both sides of the filter screen. Therefore, a ventilation opening 61 is provided at the bottom of the mounting bracket 11, and a fan 62 is installed inside the ventilation opening 61. When the knurling roller 13 rotates, the engagement of the first toothed ring 63 and the second toothed ring 64 drives the fan 62 to rotate, thereby blowing air onto the surface of the lower knurling roller 13 to dissipate heat, improving the heat dissipation efficiency of the lower knurling roller 13, ensuring that the heat dissipation efficiency of the two knurling rollers 13 is basically the same, and further improving the knurling quality of the filter screen.

[0029] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A knurling machine for producing seawater purification filter screens, comprising a workbench (10) and mounting frames (11) fixedly connected to the workbench (10), wherein knurling rollers (13) are rotatably connected between the mounting frames (11) via drive shafts (12), characterized in that: Both sides of the workbench (10) are provided with quick-fixing components (20) for fixing the filter screen plate. The quick-fixing assembly (20) includes a support frame (21) fixedly connected to both sides of the workbench (10), and a slide rod (22) fixedly connected between the support frames (21). A lead screw (24) is also rotatably connected between the support frames (21), and one end of the lead screw (24) passes through the support frame (21) and is fixedly connected to a handwheel (25). The slide rod (22) and the lead screw (24) are movably connected to a slide seat (23). A storage cavity (26) is opened inside the slide seat (23), and a lifting column (27) is slidably connected inside the storage cavity (26). A fixed seat (29) is rotatably connected to the top of the lifting column (27). A push switch (210) is provided at the upper end of the slide seat (23). The storage cavity (26) is filled with an electrorheological fluid that is electrically connected to the push switch (210).

2. The knurling machine for producing seawater purification filter screens according to claim 1, characterized in that: The lifting column (27) is a hollow column with an opening at the lower end, and a first spring (28) is fixedly connected between the lower end of the lifting column (27) and the storage cavity (26). The elastic force of the first spring (28) is greater than the pressure required to trigger the push switch (210). The lower edge of the fixed seat (29) is rounded. A limit block is provided at the top of the lifting column (27).

3. The knurling machine for producing seawater purification filter screens according to claim 2, characterized in that: The fixed base (29) is provided with a spraying assembly (30) on its exterior. The spraying assembly (30) includes a ball bearing (31) movably embedded in the bottom of the fixed base (29). A storage bladder (35) is fixedly connected to the top of the fixed base (29). A movable groove (32) is opened inside the fixed base (29), and a pusher (33) is slidably connected inside the movable groove (32). A second spring (34) is fixedly connected between the upper part of the pusher (33) and the movable groove (32). The interior of the storage bladder (35) is divided into multiple cavities by a fixedly connected partition (36), and the cavities are filled with lubricating oil. A pressure valve (37) is provided on the circumferential side of the storage bladder (35).

4. The knurling machine for producing seawater purification filter screens according to claim 3, characterized in that: The workbench (10) is provided with a smoothing and cleaning assembly (50) on both sides. The smoothing and cleaning assembly (50) includes a connecting arm (51) rotatably connected by a coil spring shaft, and a smoothing roller (52) is rotatably connected between the connecting arms (51).

5. The knurling machine for producing seawater purification filter screens according to claim 4, characterized in that: A collection box (53) is fixedly connected between the connecting arms (51), and a scraper (54) is fixedly connected to the side of the collection box (53) near the wiping roller (52). The side of the collection box (53) near the wiping roller (52) has a recess that matches the wiping roller (52), and the surface of the recess has an opening that communicates with the inside of the collection box (53).

6. The knurling machine for producing seawater purification filter screens according to claim 5, characterized in that: The workbench (10) is provided with a stable conveying assembly (40) on both sides. The stable conveying assembly (40) includes a conveying groove (41) opened on both sides of the workbench (10), and a roller (42) is rotatably connected inside the conveying groove (41). A groove (43) is opened on the surface of the roller (42), and a suction cup (44) is movably connected inside the groove (43). A top column (45) is fixedly connected to one end of the suction cup (44) near the roller (42), and an airbag ball (46) is movably connected inside the roller (42).

7. A knurling machine for producing seawater purification filter screens according to claim 6, characterized in that: The suction cup (44) extends to the outside of the groove (43) in the initial state, and the elasticity of the airbag ball (46) is greater than the resistance encountered when the top column (45) slides.

8. A knurling machine for producing seawater purification filter screens according to claim 7, characterized in that: The mounting bracket (11) is provided with a cooling component (60). The cooling component (60) includes a vent (61) opened on the surface of the mounting bracket (11), and a fan (62) is rotatably connected inside the vent (61). A first toothed ring (63) is fixedly connected to the outside of the fan (62), and a second toothed ring (64) is fixedly connected to the outside of the drive shaft (12). The second toothed ring (64) meshes with the first toothed ring (63).

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