A raising device for roughening the surface of a hook-and-loop fastener tape

Abstract

The present application relates to the technical field of raising device, and specifically discloses a raising device for processing the nap surface of hook and loop fastener, which comprises a base, a raising roller rotatably arranged on the base, a linear guide rail arranged below the raising roller, both ends of the linear guide rail fixedly connected with the base, a sliding seat slidably arranged on the linear guide rail, a fixed rod fixedly arranged on the sliding seat, a ring-shaped cylinder rotatably arranged on the fixed rod, a rotating structure arranged on the fixed rod for driving the ring-shaped cylinder to rotate, a chain arranged on the ring-shaped cylinder in a circumferential array, the chain arranged along the length extension direction of the ring-shaped cylinder and wound on the ring-shaped cylinder, a brush arranged on the outer surface of the chain, a driving sprocket engagedly connected with the chain by being sleeved on both sides of the chain, the driving sprocket rotatably connected with the ring-shaped cylinder, and a singeing structure arranged on the fixed rod for cleaning the brush. The cleaning efficiency of the brush on the raising roller is improved, and the raising effect of the raising roller is improved.

Description

Technical Field

[0001] This invention relates to the field of napping device technology, and specifically to a napping device for processing the napped surface of hook and loop fasteners. Background Technology

[0002] Hook and loop fasteners, also known as Velcro or Velcro, are a common fastening accessory used in clothing. They consist of two sides: one side is made of soft, fine fibers, and the other side is made of elastic fibers with hooks. When the two sides are interlocked, under a certain lateral force, the elastic hooks straighten, detach from the loops, and then return to their original shape. During the production of hook and loop fasteners, a napping device is used to nap the soft fiber side. During this process, a large amount of lint is generated on the surface of the napping roller, affecting the napping effect. Existing napping devices require stopping production to clean the lint adhering to the roller surface, resulting in reduced efficiency.

[0003] Chinese patent document CN113089241A discloses a fleece raising machine for easy polishing and cleaning of the needle cloth roller. The machine includes a raising roller mounted on a frame via bearings. Below the raising roller are two parallel linear guide rails, a first and a second. The starting end of the second linear guide rail has a cleaning device for facilitating the cleaning of the brush mechanism. After cleaning the raising roller, the brush mechanism returns to its starting position, bringing the brush placement area back to its original position. This allows the brush placement area and the cleaning area to connect and form a complete housing. The brush mechanism is then cleaned, ensuring it operates in a sealed state, allowing cleaning without affecting the normal operation of the raising roller. When the brush mechanism is working, the brush placement area does not interfere with its operation, allowing the brush roller to both clean the raising roller and itself during operation.

[0004] The shortcomings of the aforementioned disclosed solution are as follows: after the brush roller cleans the fuzzing roller for a period of time, a large amount of lint will adhere to the outer surface of the brush roller, reducing the cleaning efficiency of the brush roller. Therefore, before the lint on the outer surface of the fuzzing roller is completely cleaned, the cleaning of the fuzzing roller needs to be interrupted, and the brush roller needs to be moved to a clean area for cleaning before cleaning of the fuzzing roller can continue. Therefore, it is not convenient for the brush roller to continuously clean the surface of the fuzzing roller, which reduces the cleaning efficiency of the brush roller on the fuzzing roller and affects the fuzzing effect of the fuzzing roller. Summary of the Invention

[0005] This invention provides a napping device for processing the napped surface of hook and loop fasteners, which can effectively solve the problems in the background art.

[0006] This invention provides a napping device for processing the napped surface of hook and loop fasteners, comprising a base, a napping roller rotatably mounted on the base, a linear guide rail positioned below the napping roller, both ends of the linear guide rail being fixedly connected to the base, a slide block slidably mounted on the linear guide rail, a fixed rod fixedly mounted on the slide block, an annular cylinder rotatably mounted on the fixed rod, and a rotating structure for driving the annular cylinder to rotate on the fixed rod, a chain arranged in a circumferential array on the annular cylinder, the chains being arranged along the length of the annular cylinder and wound around it, a brush mounted on the outer surface of the chain, and at least two drive sprockets meshing and connected inside each chain, the drive sprockets being rotatably mounted at both ends of the annular cylinder, and the fixed rod... The device is equipped with a singeing structure for cleaning brushes. Two brushes are provided, fixedly spaced on the outer surface of the chain, with one brush located outside the annular cylinder and the other inside. A drive sprocket rotates the chain to allow the two brushes to alternate. The singeing structure includes a singeing nozzle, fixedly mounted on a fixed rod inside the annular cylinder. A gas chamber communicating with the singeing nozzle is located inside the fixed rod, and a gas pipe communicating with the gas chamber is mounted on the fixed rod outside the annular cylinder. The annular cylinder drives multiple brushes to rotate and pass sequentially through the singeing nozzle, ensuring that all brushes are singed.

[0007] Furthermore, fixed plates are fixedly installed on both sides of the annular cylinder, and the fixed plates are rotatably sleeved on the fixed rod. The rotating structure includes a motor and a fixed sleeve. The motor is fixedly installed on the fixed rod, and a drive gear is fixedly installed at the output end of the motor. The fixed sleeve is rotatably sleeved on the fixed rod, and one end of the fixed sleeve is fixedly connected to the fixed plate. An annular gear is fixedly sleeved on the fixed sleeve, and the annular gear meshes with the drive gear.

[0008] Furthermore, the fixed plate is evenly provided with through holes, each of which corresponds to a chain. A sliding plate is slidably mounted on the fixed sleeve. A blocking block for sealing the through holes is evenly provided on the side of the sliding plate near the fixed plate. An electric push rod is fixedly mounted on the fixed sleeve, and the output end of the electric push rod is fixedly connected to the sliding plate.

[0009] Furthermore, the fixing rod is provided with a water spray hole located inside the annular cylinder, and a water passage cavity communicating with the water spray hole is provided inside the fixing rod. A water injection pipe communicating with the water passage cavity is provided on the fixing rod, and the water injection pipe is located outside the annular cylinder.

[0010] Furthermore, a collection groove is provided circumferentially on the inner side of the annular cylinder, and multiple drainage channels communicating with the collection groove are provided inside the annular cylinder, and the drainage channels are connected to the outside of the annular cylinder.

[0011] Furthermore, a liquid collection tray is fixedly sleeved on one side of the fixed rod, and an annular groove is opened on the side of the liquid collection tray near the annular cylinder. A rotating ring is slidably and sealed in the annular groove. A fixed pipe is fixedly installed at one end of the drain channel that communicates with the outside of the annular cylinder. The other end of the fixed pipe passes through the rotating ring and communicates with the inside of the liquid collection tray. A drain pipe is provided at the bottom of the liquid collection tray.

[0012] The beneficial effects of this invention are as follows:

[0013] A brush is installed on the outer surface of the chain. When cleaning the raising roller, the motor is started, driving the gears to rotate. The gears, through a ring gear, drive the fixed sleeve to rotate. The fixed sleeve, through a fixed plate, drives the annular cylinder to rotate. The rotation of the annular cylinder causes the brushes on the chain to clean the lint on the outer surface of the raising roller. After a period of cleaning, the brushes on the outside of the annular cylinder will accumulate a large amount of lint, affecting their cleaning effect. Then, multiple drive sprockets are activated, driving multiple chains to rotate simultaneously. The chains carry the brushes on the outside of the annular cylinder into the interior of the annular cylinder, while the chains simultaneously carry the brushes inside the annular cylinder to the outside through the through-hole, thus replacing the brushes. The clean brushes can then continue cleaning the raising roller. The brushes inside the annular cylinder with a large amount of lint can be cleaned using a singeing structure, making it easier to move to the outside of the annular cylinder for cleaning the raising roller next time. Therefore, even when the brushes on the outside of the annular cylinder accumulate a large amount of lint, the cleaning process of the raising roller can be interrupted, and the clean brushes inside the annular cylinder can be promptly replaced for cleaning. Simultaneously, the brushes that have lint adhering to the annular cylinder are cleaned. This ensures that clean brushes are always continuously cleaning the raising roller, improving the cleaning efficiency of the brushes and thus enhancing the raising effect of the raising roller. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 This is a three-dimensional schematic diagram of the fixing base and the annular cylinder of the present invention;

[0016] Figure 3 This is a schematic cross-sectional view of the annular cylinder and the fixing rod of the present invention;

[0017] Figure 4 This is a schematic cross-sectional view of the inside of the annular cylinder with the chain concealed according to the present invention.

[0018] Figure label:

[0019] 1. Base; 2. Raising roller; 3. Linear guide rail; 4. Slide; 5. Annular cylinder; 6. Chain; 7. Drive sprocket; 8. Brush; 9. Fixing plate; 10. Through hole; 11. Fixing sleeve; 12. Sliding plate; 13. Sealing block; 14. Electric push rod; 15. Fixing rod; 16. Ring gear; 17. Motor; 18. Drive gear; 19. Gas chamber; 20. Singeing nozzle; 21. Water chamber; 22. Water spray hole; 23. Gas pipe; 24. Water injection pipe; 25. Collection tank; 26. Drainage channel; 27. Fixing pipe; 28. Rotating ring; 29. ​​Collection tray; 30. Drainage pipe. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1 to 4 As shown, a napping device for processing the napped surface of hook and loop fasteners according to the present invention includes a base 1, a napping roller 2 rotatably mounted on the base 1, and a linear guide rail 3 mounted below the napping roller 2, both ends of the linear guide rail 3 being fixedly connected to the base 1. A slide block 4 is slidably mounted on the linear guide rail 3 along its length direction. The slide block 4 has a "U"-shaped structure, and a fixing rod 15 is mounted on the slide block 4, both ends of the fixing rod 15 being fixedly connected to the slide block 4.

[0022] An annular cylinder 5 is rotatably mounted on a fixed rod 15, and fixed plates 9 are fixedly mounted on both sides of the annular cylinder 5. The fixed rod 15 passes through the center of the two fixed plates 9 and the interior of the annular cylinder 5, and the fixed rod 15 is rotatably connected to the two fixed plates 9. A rotating structure for driving the annular cylinder 5 to rotate is mounted on the fixed rod 15.

[0023] The rotating structure includes a motor 17 and a fixed sleeve 11. The motor 17 is fixedly mounted on the outer surface of the fixed rod 15, and the motor 17 is located on one side close to the slide 4. The output end of the motor 17 is fixedly mounted with a drive gear 18.

[0024] The fixing sleeve 11 is rotatably sleeved on the outer surface of the fixing rod 15, and one end of the fixing sleeve 11 is fixedly fitted with the corresponding fixing plate 9. A ring gear 16 is fixedly sleeved on each fixing sleeve 11, and the ring gear 16 is meshed with the corresponding driving gear 18.

[0025] Chains 6 are arranged in a circumferential array on the annular cylinder 5, extending along its length and wound around it. Two drive sprockets 7 are fitted inside each chain 6, located at opposite ends of the annular cylinder 5, to tension the chains 6. The drive sprockets 7 are rotatably mounted on the annular cylinder 5.

[0026] The drive sprocket 7 consists of a servo motor and a sprocket. The servo motor is fixedly installed inside the annular cylinder 5. The output end of the servo motor is fixedly installed with a sprocket. The sprockets are all located at the ends of the annular cylinder 5 and are meshed with the corresponding chain 6.

[0027] Two brushes 8 are fixedly installed at intervals on the outer surface of the chain 6, with one brush 8 located outside the annular cylinder 5 and the other brush 8 located inside the annular cylinder 5. The brushes 8 are made of high-temperature resistant metal material.

[0028] The fixed plate 9 has a circular array of through holes 10, each corresponding to a chain 6. This facilitates the chain 6 in driving the brush 8 to rotate.

[0029] It should be noted that brush 8 is composed of multiple brush units. Each brush unit consists of a high-temperature resistant metal pad and bristles. Small holes are evenly distributed on the metal pad, and the bottom of the bristles is welded into the holes. The metal pads are then welded one-to-one onto the links of the chain 6, allowing the brush units to rotate with the chain 6. Multiple brush units on consecutive adjacent links form a brush 8.

[0030] A singeing structure for cleaning the brush 8 is mounted on the fixed rod 15. The singeing structure includes multiple singeing nozzles 20, which are evenly spaced and fixedly mounted on the outer surface of the fixed rod 15, and all nozzles 20 are located inside the annular cylinder 5. A gas chamber 19 communicating with the multiple singeing nozzles 20 is opened inside the fixed rod 15. A gas pipe 23 communicating with the gas chamber 19 is mounted on the outer surface of the fixed rod 15, and the gas pipe 23 is located outside the annular cylinder 5. The gas pipe 23 is used to connect to external gas to supply gas to the singeing nozzles.

[0031] A sliding plate 12 is slidably mounted on the fixed sleeve 11. A sealing block 13, corresponding to a through hole 10, is uniformly fixedly installed on the side of the sliding plate 12 closest to the fixed plate 9. The sealing block 13 is used to seal the through hole 10, preventing the flame from the singeing nozzle 20 from igniting the raising roller 2. An electric push rod 14 is fixedly mounted on the outer surface of the fixed sleeve 11, and the output end of each electric push rod 14 is fixedly connected to the corresponding sliding plate 12.

[0032] The fixed rod 15 has evenly spaced water spray holes 22 located inside the annular cylinder 5. A water passage cavity 21 communicating with the water spray holes 22 is provided inside the fixed rod 15. A water injection pipe 24 communicating with the water passage cavity 21 is provided on the fixed rod 15, and the water injection pipe 24 is located outside the annular cylinder 5. The water injection pipe 24 is used to connect to an external water source, injecting water into the water passage cavity 21. The water flows through the water passage cavity into the water spray holes 22 and is sprayed onto the brush 8.

[0033] A collection trough 25 is provided on the inner circumferential side of the annular cylinder 5, and the two sides of the collection trough 25 gradually slope towards the center line of the inner circumference of the annular cylinder 5. This facilitates the flow of water after cleaning the brush 8 into the collection trough 25. Multiple drainage channels 26 are provided inside the annular cylinder 5, which communicate with the middle position of the collection trough 25, and the drainage channels 26 communicate with the outside of the annular cylinder 5.

[0034] A liquid collecting tray 29 is fixedly sleeved on one side of the fixed rod 15. An annular groove is opened on the side of the liquid collecting tray 29 near the annular cylinder 5, and a rotating ring 28 is slidably and sealed inside the annular groove. A fixed pipe 27 is fixedly installed at one end of the drain channel 26 that communicates with the outside of the annular cylinder 5. The other end of the fixed pipe 27 passes through the rotating ring 28 and communicates with the inside of the liquid collecting tray 29. A drain pipe 30 is installed at the bottom of the liquid collecting tray 29.

[0035] The working principle of the napping device for processing the napped surface of hook and loop fasteners provided by this invention is as follows:

[0036] The figures show the initial state of the device, i.e., the state during the cleaning process of the lint roller 2, with the brush 8 in contact with the outer surface of the lint roller. The annular cylinder 5 and the drive chain 6 are both made of high-temperature resistant, non-thermal conductive materials.

[0037] To use, start the raising roller 2 to rotate, place the adhesive tape to be raised on top of the raising roller 2, and the raising process will begin. After prolonged use, a large amount of lint will adhere to the outside of the raising roller 2. At this time, it is necessary to clean this lint to avoid affecting the subsequent raising effect.

[0038] When cleaning the raising roller 2, there is no need to turn off the raising roller 2, that is, the raising roller 2 is operating normally. Then, start the linear guide rail 3 to drive the slide 4 to move back and forth left and right. The slide 4 drives the annular cylinder 5 to move back and forth left and right. The annular cylinder 5 moves back and forth left and right, which drives the brush 8 to move back and forth left and right.

[0039] Then, the motor 17 is started at the same time. The motor 17 drives the drive gear 18 to rotate. The drive gear 18 drives the fixed sleeve 11 to rotate through the ring gear 16. The fixed sleeve 11 drives the ring cylinder 5, chain 6 and brush 8 to rotate through the fixed plate 9. Through the rotation of the multiple brushes 8 on the outside and the reciprocating movement of the brushes 8, the lint adhering to the outside of the lint roller 2 can be cleaned.

[0040] After a period of cleaning, a large amount of lint will adhere to the multiple brushes 8 located on the outer side of the annular cylinder 5. At this point, the cleaning effect of the brushes 8 deteriorates, and the lint adhering to them needs to be removed. At this time, the drive sprocket 7 can be activated, simultaneously driving the chain 6 to rotate synchronously. The rotation of the chain 6 causes the clean brushes 8 located on the inner side of the annular cylinder 5 to move through the through-hole 10 to the outer side of the annular cylinder 5 and contact the outer surface of the raising roller 2. Simultaneously, the rotation of the chain 6 causes the lint-adhered brushes 8 located on the outer side of the annular cylinder 5 to move through the through-hole 10 to the inner side of the annular cylinder 5. This completes the replacement of the brushes 8, and then the drive sprocket 7 is turned off. Afterwards, the clean brushes 8 located on the outer side of the annular cylinder 5 can continue to clean the outer surface of the raising roller 2.

[0041] The electric push rod 14 extends, causing the sliding plate 12 and the sealing block 13 to move towards the fixed plate 9. After the sealing block 13 blocks the through hole 10, the electric push rod 14 is closed. Then, an external gas source is connected through the gas pipe 23, and gas is supplied to the singeing nozzle 20 through the gas chamber 19.

[0042] Multiple singeing nozzles 20 are activated to singe the fibers on the brushes 8 inside the annular cylinder 5. Since the annular cylinder 5 is rotating, it drives the multiple brushes 8 to rotate and pass them sequentially through the singeing nozzles 20, ensuring that all brushes 8 are singed. After the fibers on the brushes 8 are singed, the singeing nozzles 20 are turned off.

[0043] Connect the external water pump to the water injection pipe 24 and the external water pump to the drain pipe 30. Simultaneously start both the water injection pump and the external water pump. The water injection pump forces water through the water injection pipe 24 and the water passage chamber 21, then sprays it out from the spray hole 22 to clean the singed brushes 8 inside the annular cylinder 5. Since the annular cylinder 5 is rotating, it drives multiple brushes 8 to rotate and pass through the spray hole 22 sequentially, ensuring that all singed brushes 8 are cleaned.

[0044] The washed water flows into the collection tank 25. Because the annular cylinder 5 is rotating, the washed water is subjected to centrifugal force, which accelerates the flow of the washed water through the collection tank 25 to the drain channel 26. When the annular cylinder 5 is stationary, the washed water can be discharged through the drain channel 26, which is located at the lowest point, under the action of gravity.

[0045] The water pump will discharge the cleaned water to the outside through the drainage channel 26, fixed pipe 27, rotating ring 28, collection tray 29, and drain pipe 30. After cleaning is completed, the water injection pump and the water pump will be turned off.

[0046] Restart the singeing nozzle 20 to evaporate the residual water on the cleaned brush 8. After removing the water from the brush 8, turn off the singeing nozzle 20.

[0047] When the brushes 8 on the outside of the annular cylinder 5 become covered with lint again, affecting cleaning efficiency, the electric push rod 14 is activated to retract, so that the sealing block 13 no longer blocks the through hole 10. Then, the drive sprocket 7 is activated to replace the inner and outer brushes 8.

[0048] Then repeat the above steps to clean the brush 8 that has lint stuck to it.

[0049] After a large amount of lint adheres to the brushes 8 on the outside of the annular cylinder 5, the cleaning process of the raising roller 2 can be continued without interrupting. The lint-covered brushes 8 on the outside of the annular cylinder 5 can be replaced by clean brushes 8 on the inside of the annular cylinder 5. Simultaneously, the lint-covered brushes 8 inside the annular cylinder 5 are cleaned, ensuring that clean brushes 8 are always continuously cleaning the raising roller 2. This improves the cleaning efficiency of the brushes 8 on the raising roller 2, thereby improving the raising effect of the raising roller 2.

[0050] After the lint on the outer surface of the lint roller 2 has been cleaned, turn off the motor 17 and the linear guide rail 3, and rotate the brush 8 to a position where it does not contact the lint roller 8.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A napping device for processing the napped surface of hook and loop fasteners, comprising a base (1), characterized in that, A raising roller (2) is rotatably mounted on the base (1). A linear guide rail (3) is mounted below the raising roller (2). Both ends of the linear guide rail (3) are fixedly connected to the base (1). A slide block (4) is slidably mounted on the linear guide rail (3). A fixing rod (15) is fixedly mounted on the slide block (4). An annular cylinder (5) is rotatably mounted on the fixing rod (15). A rotating structure for driving the annular cylinder (5) to rotate is provided on the fixing rod (15). A chain (6) is arranged in a circumferential array on the annular cylinder (5). The chain (6) is arranged along the length extension direction of the annular cylinder (5) and wound around the annular cylinder (5). A brush (8) is provided on the outer surface of the chain (6). At least two drive sprockets (7) are meshed and connected inside each chain (6). The drive sprockets (7) are rotatably mounted on both ends of the annular cylinder (5). A singeing structure for cleaning the brush (8) is provided on the fixing rod (15). The number of brushes (8) is set to two. The two brushes (8) are fixedly set at intervals on the outer surface of the chain (6), and one brush (8) is located outside the annular cylinder (5) and the other brush (8) is located inside the annular cylinder (5). The drive sprocket (7) drives the chain (6) to rotate so as to realize the replacement of the two brushes (8). The singeing structure includes a singeing nozzle (20). The singeing nozzle (20) is fixedly set on the fixed rod (15) and the singeing nozzle (20) is located inside the annular cylinder (5). A gas chamber (19) communicating with the singeing nozzle (20) is opened in the fixed rod (15). A gas pipe (23) communicating with the gas chamber (19) is set on the fixed rod (15) and the gas pipe (23) is located outside the annular cylinder (5). The annular cylinder (5) will drive multiple brushes (8) to rotate and pass through the singeing nozzle (20) in sequence, so that multiple brushes (8) are singeed.

2. The napping device for processing the napped surface of hook and loop fasteners according to claim 1, characterized in that, The annular cylinder (5) is fixedly provided with fixing plates (9) on both sides. The fixing plates (9) are rotatably sleeved on the fixing rod (15). The rotating structure includes a motor (17) and a fixing sleeve (11). The motor (17) is fixedly provided on the fixing rod (15). The output end of the motor (17) is fixedly provided with a drive gear (18). The fixing sleeve (11) is rotatably sleeved on the fixing rod (15). One end of the fixing sleeve (11) is fixedly connected to the fixing plate (9). The fixing sleeve (11) is fixedly sleeved with an annular gear (16). The annular gear (16) is meshed with the drive gear (18).

3. The napping device for processing the napped surface of hook and loop fasteners according to claim 2, characterized in that, The fixed plate (9) is provided with through holes (10) evenly, and each through hole (10) corresponds to a chain (6). A sliding plate (12) is slidably mounted on the fixed sleeve (11). A blocking block (13) for blocking the through hole (10) is evenly provided on the side of the sliding plate (12) close to the fixed plate (9). An electric push rod (14) is fixedly mounted on the fixed sleeve (11). The output end of the electric push rod (14) is fixedly connected to the sliding plate (12).

4. The napping device for processing the napped surface of hook and loop fasteners according to claim 1, characterized in that, The fixing rod (15) is provided with a water spray hole (22), and the water spray hole (22) is located inside the annular cylinder (5). The fixing rod (15) is provided with a water passage cavity (21) communicating with the water spray hole (22). The fixing rod (15) is provided with a water injection pipe (24) communicating with the water passage cavity (21), and the water injection pipe (24) is located outside the annular cylinder (5).

5. A napping device for processing the napped surface of hook and loop fasteners according to claim 4, characterized in that, The annular cylinder (5) has a collection groove (25) circumferentially opened on the inner side, and a plurality of drainage channels (26) communicating with the collection groove (25) are opened inside the annular cylinder (5), and the drainage channels (26) are communicating with the outside of the annular cylinder (5).

6. A napping device for processing the napped surface of hook and loop fasteners according to claim 5, characterized in that, A liquid collection plate (29) is fixedly sleeved on one side of the fixed rod (15). An annular groove is opened on the side of the liquid collection plate (29) near the annular cylinder (5). A rotating ring (28) is slidably sealed in the annular groove. A fixed pipe (27) is fixedly installed at one end of the drain channel (26) that communicates with the outside of the annular cylinder (5). The other end of the fixed pipe (27) passes through the rotating ring (28) and communicates with the inside of the liquid collection plate (29). A drain pipe (30) is provided at the bottom of the liquid collection plate (29).

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