Shoemaking dirt preventing and removing device

Abstract

A shoemaking dirt prevention and removal device belongs to the field of dirt prevention and removal and comprises an air pressure driving expansion cleaning device, a pre-storage foundation plate device and a grip pressure device, and the pre-storage foundation plate device comprises a cleaning plate. The linear groove can store a part of cloth of the elastic fiber cloth bag in advance, when the cavity is cleaned, the annular air bag is inflated to expand and can drive the elastic fiber cloth bag to expand, so that a part of the elastic fiber cloth bag stored in the linear groove is driven to be pulled out, and the elastic fiber cloth bag is pulled out under the pressure. And friction can be generated with the inner wall of the cavity, so that the cleaning effect on the inner wall of the cavity is improved.

Description

Technical Field

[0001] This invention belongs to the field of dirt removal, and more specifically, it is a dirt removal device for shoemaking. Background Technology

[0002] Existing shoe-making dirt removal devices use wood chips to be flushed into the mold cavity for cleaning. However, the wood chips have poor adsorption effect, and the adhesion between the wood chips and the waste residue on the inner wall of the mold cavity is weak, resulting in poor cleaning effect. For example, prior art patent publication number: CN115194987A discloses a Chinese patent document on an easy-to-clean shoe mold, as shown in Figure 7. The wood chips flushed into the mold cavity in the technical solution disclosed in this patent document do not fit tightly with the inner wall of the mold cavity, resulting in poor cleaning effect. Summary of the Invention

[0003] The purpose of this invention is to provide a shoe-making dirt removal device that can pre-store a portion of the fabric in an elastic fiber bag. When cleaning the cavity, the annular airbag inflates, causing the elastic fiber bag to expand. This causes a portion of the elastic fiber bag stored inside the slot to be pulled out, allowing the elastic fiber bag to rub against the inner wall of the cavity under pressure, thereby improving the cleaning effect on the inner wall of the cavity.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A shoe dirt removal device includes a pneumatically driven extended cleaning device, a pre-storage base plate device, and a grip pressure device. The pre-storage base plate device includes a cleaning plate with a slotted groove at its bottom. An annular airbag is installed on the side of the cleaning plate, and the inner side of the annular airbag is connected to the outer side of the cleaning plate. An elastic fiber bag is fitted onto the cleaning plate, and the middle of the elastic fiber bag is inserted into the slotted groove. The pneumatically driven extended cleaning device includes a cylinder. The grip pressure device includes a handle rod. The cylinder is a tubular shell structure with one end sealed. The sealed end of the cylinder is connected to the handle rod, and both ends of the handle rod are connected to transmission rods. One end of the transmission rod engages with the cleaning plate. A piston is installed inside the cylinder, and the side of the piston fits against the inner wall of the cylinder. A piston rod is connected to the middle of the piston, and one end of the piston rod is connected to a finger-pressing handle. An air pipe is installed on one side of the cylinder, with one end of the air pipe communicating with the inside of the cylinder and the other end communicating with the inside of the annular airbag.

[0005] To further achieve the purpose of the present invention, the following technical solution can also be adopted: an annular groove is opened on the side of the cleaning plate, and after the annular airbag is inflated, the side can enter the annular groove.

[0006] The elastic fiber bag is a bag-shaped structure made of elastic fiber fabric with an opening at the top. An annular elastic band is installed at the opening of the elastic fiber bag, and the side periphery of the annular elastic band is connected to the side periphery of the opening of the elastic fiber bag. Several scrapers are connected to the outside of the elastic fiber bag. The scrapers are plastic sheets covered with fiber cloth, and one side of the scraper is connected to the elastic fiber bag.

[0007] A linkage positioning device is installed between the transmission rod and the cleaning plate. The linkage positioning device includes a pressure plate with a first through hole and a second through hole. One end of the transmission rod passes through the second through hole. Two limiting plates are connected to the transmission rod. The transmission rod passes through the middle of the limiting plates and is welded to the limiting plates. One of the limiting plates is located on the upper part of the pressure plate. A fixing groove is opened on the cleaning plate. An annular plate is connected to the opening of the fixing groove. The side circumference of the annular plate is connected to the inner wall side circumference of the fixing groove. The end of the transmission rod passes through the middle hole of the annular plate and is connected to another limiting plate. The limiting plate cannot pass through the middle hole of the annular plate, nor can it pass through the second through hole. The upper part of the cleaning plate is connected to an annular sawtooth, and the bottom of the pressure plate is connected to a protruding rib. The annular sawtooth and the protruding rib can cooperate to clamp the elastic fiber cloth bag. One end of the air tube can pass through the first through hole, and a spring-shaped area is set in the middle of the air tube.

[0008] The advantages of this invention are as follows: This invention combines a pneumatically driven extended cleaning device, a pre-storage base plate device, and a handle pressure device, allowing the I-shaped groove to pre-store a portion of the elastic fiber bag fabric. When cleaning the cavity, the annular airbag inflates, causing the elastic fiber bag to expand, thereby pulling out a portion of the elastic fiber bag stored inside the I-shaped groove. This allows the elastic fiber bag to rub against the inner wall of the cavity under pressure, thus improving the cleaning effect. During operation, this invention simultaneously achieves: ① When the operator holds the handle, they can press the handle with their fingers to compress the internal gas of the cylinder, inflating the annular airbag. ② The operator can simultaneously push the cleaning plate towards one side of the cavity, allowing the elastic fiber bag to engage with the inner wall of the cavity under certain pressure. Simultaneously, the pressure plate and cleaning plate work together to clamp the opening of the elastic fiber bag, facilitating the expansion of the elastic fiber bag along with the annular airbag, improving the cleaning effect. ③ After the annular airbag inflates, it fills the shoe sole-shaped contour of the cavity, thus allowing for a more thorough cleaning of the cavity's inner wall. ④ The inflation of the annular airbag causes the elastic fiber bag to expand. When the elastic fiber bag reaches a point where it can no longer expand, it continues to expand, causing the elastic fiber bag to rub against the cavity's inner wall under pressure, thereby cleaning the cavity's inner wall. Attached Figure Description

[0009] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the annular airbag 8 in its uninflated state according to the present invention; Figure 2for Figure 1 A schematic diagram of the enlarged structure in direction A; Figure 3 This is a schematic diagram of the bottom structure of the cleaning plate of the present invention; Figure 4 This is a schematic diagram of the elastic fiber bag of the present invention reaching a taut state. Figure 5 For the present invention in Figure 4 A schematic diagram of the structure after further inflation; Figure 6 for Figure 1 A schematic diagram of the enlarged structure of Part I; Figure 7 This is a schematic diagram of the structure of the prior art patent publication number: CN115194987A.

[0010] Components marked: 1. Handle lever; 2. Cylinder; 3. Piston; 4. Transmission rod; 5. Piston rod; 6. Finger-press handle; 7. Elastic fiber bag; 8. Annular airbag; 9. I-shaped groove; 10. Air tube; 11. Spring-shaped area; 12. Annular groove; 13. Scraper; 14. Cleaning plate; 15. Pressure plate; 16. Iron sheet pressure groove; 17. First through hole; 18. Annular plate; 19. Fixing groove; 20. Limiting plate; 21. Second through hole; 22. Raised ridge; 23. Annular elastic band; 24. Annular serration; 25. Cavity; 26. Lower template; 27. Pneumatically driven extended cleaning device; 28. Pre-storage base plate device; 29. ​​Handle pressure device; 30. Air tube groove. Detailed Implementation

[0011] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Embodiment 1: Shoe stain removal devices, such as Figures 1-6As shown, the device includes a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29. The pre-storage base plate device 28 includes a cleaning plate 14 with a slot 9 at its bottom. An annular airbag 8 is installed on the side of the cleaning plate 14, and the inner side of the annular airbag 8 is connected to the outer side of the cleaning plate 14. An elastic fiber bag 7 is fitted onto the cleaning plate 14, and the middle of the elastic fiber bag 7 is inserted into the slot 9. The pneumatically driven extended cleaning device 27 includes a cylinder 2, and the grip pressure device 29 includes a... The cylinder 2 is a tubular shell structure with one end sealed. The sealed end of the cylinder 2 is connected to the handle 1. Both ends of the handle 1 are connected to the transmission rod 4. One end of the transmission rod 4 is engaged with the cleaning plate 14. The piston 3 is installed inside the cylinder 2. The side of the piston 3 is in contact with the side of the inner wall of the cylinder 2. The piston rod 5 is connected to the middle of the piston 3. One end of the piston rod 5 is connected to the finger press handle 6. An air pipe 10 is installed on one side of the cylinder 2. One end of the air pipe 10 is connected to the inside of the cylinder 2, and the other end of the air pipe 10 is connected to the inside of the annular airbag 8.

[0012] This invention combines a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29, allowing the straight groove 9 to pre-store a portion of the elastic fiber bag 7. When cleaning the cavity 25, the annular airbag 8 inflates, causing the elastic fiber bag 7 to expand. This pulls out a portion of the elastic fiber bag 7 stored inside the straight groove 9, allowing the elastic fiber bag 7 to rub against the inner wall of the cavity 25 under pressure, thus improving the cleaning effect on the inner wall of the cavity 25. During operation, this invention simultaneously achieves: ① When a person holds the handle 1, they can use their hand to pull and press the handle 6 to compress the internal gas of the cylinder 2, causing the annular airbag 8 to inflate. ② Personnel can simultaneously push the cleaning plate 14 towards one side of the cavity 25, allowing the elastic fiber bag 7 to engage with the inner wall of the cavity 25 under certain pressure. Simultaneously, the pressure plate 15 and cleaning plate 14 work together to clamp the opening of the elastic fiber bag 7, facilitating its inflation along with the annular airbag 8 and improving cleaning efficiency. ③ After inflation, the annular airbag 8 fills the shoe-sole-shaped contour of the cavity 25, resulting in a more thorough cleaning of the inner wall of the cavity 25. ④ Inflation of the annular airbag 8 causes the elastic fiber bag 7 to expand. When the elastic fiber bag 7 reaches a point where it can no longer expand, it continues to expand, causing it to rub against the inner wall of the cavity 25 under pressure, thus cleaning the inner wall of the cavity 25.

[0013] Specific material selection and feasibility analysis: The samples we actually produced used the accompanying drawings as blueprints, implementing the process according to the proportions and fit methods of each component shown in the drawings. The connections used included common methods such as strong adhesive bonding, welding, riveting, flange connections, and integral molding. During actual production, the appropriate connection method, thickness, and strength of the connection points can be selected based on the actual connection strength requirements without creative design. When installing the elastic fiber bag 7, a thin iron sheet can be used to push a portion of the bottom of the elastic fiber bag 7 into the straight groove 9, forming an iron sheet pressing groove 16. When the annular airbag 8 is not inflated, it achieves... Figure 1 In this state, after the elastic fiber bag 7 is inserted into the cavity 25, the distance between the outer edge of the elastic fiber bag 7 and the inner wall of the cavity 25 is 1 mm, ensuring that the elastic fiber bag 7 can fill the interior of the cavity 25 after inflation. The elastic fiber bag 7 is fitted onto the cleaning plate 14 and the annular airbag 8.

[0014] Example 2: Shoe stain removal devices, such as Figures 1-2 As shown, the device includes a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29. The pre-storage base plate device 28 includes a cleaning plate 14 with a slot 9 at its bottom. An annular airbag 8 is installed on the side of the cleaning plate 14, and the inner side of the annular airbag 8 is connected to the outer side of the cleaning plate 14. An elastic fiber bag 7 is fitted onto the cleaning plate 14, and the middle of the elastic fiber bag 7 is inserted into the slot 9. The pneumatically driven extended cleaning device 27 includes a cylinder 2, and the grip pressure device 29 includes a... The device includes a handle 1 and a cylinder 2, which is a tubular shell structure with one end sealed. The sealed end of the cylinder 2 is connected to the handle 1, and both ends of the handle 1 are connected to transmission rods 4. One end of the transmission rod 4 mates with a cleaning plate 14. A piston 3 is installed inside the cylinder 2, and the side circumference of the piston 3 fits against the inner wall of the cylinder 2. A piston rod 5 is connected to the middle of the piston 3, and one end of the piston rod 5 is connected to a finger-pressing handle 6. An air pipe 10 is installed on one side of the cylinder 2, with one end of the air pipe 10 communicating with the inside of the cylinder 2 and the other end communicating with the inside of an annular airbag 8. An annular groove 12 is formed on the side circumference of the cleaning plate 14, allowing the side of the annular airbag 8 to enter the annular groove 12 after inflation. The annular groove 12 of the present invention allows a portion of the annular airbag 8 to enter after expansion, thereby improving the stability of the engagement between the annular airbag 8 and the cleaning plate 14.

[0015] Example 3: Shoe stain removal devices, such as Figures 1-2As shown, the device includes a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29. The pre-storage base plate device 28 includes a cleaning plate 14 with a slot 9 at its bottom. An annular airbag 8 is installed on the side of the cleaning plate 14, and the inner side of the annular airbag 8 is connected to the outer side of the cleaning plate 14. An elastic fiber bag 7 is fitted onto the cleaning plate 14, and the middle of the elastic fiber bag 7 is inserted into the slot 9. The pneumatically driven extended cleaning device 27 includes a cylinder 2, and the grip pressure device 29 includes a... The cylinder 2 is a tubular shell structure with one end sealed. The sealed end of the cylinder 2 is connected to the handle 1. Both ends of the handle 1 are connected to transmission rods 4. One end of the transmission rod 4 mates with the cleaning plate 14. A piston 3 is installed inside the cylinder 2. The side circumference of the piston 3 fits against the side circumference of the inner wall of the cylinder 2. A piston rod 5 is connected to the middle of the piston 3. One end of the piston rod 5 is connected to a finger-pressing handle 6. An air pipe 10 is installed on one side of the cylinder 2. One end of the air pipe 10 communicates with the inside of the cylinder 2, and the other end of the air pipe 10 communicates with the inside of the annular airbag 8. The elastic fiber bag 7 is a bag-shaped structure with an open top, made of elastic fiber cloth. An annular elastic band 23 is installed at the opening of the elastic fiber bag 7. The side circumference of the annular elastic band 23 is connected to the side circumference of the opening of the elastic fiber bag 7. The annular elastic band 23 of the present invention can easily tighten the opening of the elastic fiber bag 7, allowing the elastic fiber bag 7 to fit more tightly onto the annular airbag 8, achieving... Figure 4 In the current state, the elastic fiber bag 7 is taut and cannot further expand its area using its elasticity. When gas continues to be injected into the annular airbag 8, the elastic fiber bag 7 can be driven by the annular airbag 8 to slide relative to the inner wall of the cavity 25, thereby cleaning the inner wall of the cavity 25. The elasticity of the elastic fiber bag 7 allows a portion of the elastic fiber bag 7 to be easily inserted into the inside of the straight groove 9, making it easier for the elastic fiber bag 7 to better conform to the contours of the annular airbag 8 and the cleaning plate 14.

[0016] Example 4: Shoe stain removal devices, such as Figures 1-2As shown, the device includes a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29. The pre-storage base plate device 28 includes a cleaning plate 14 with a slot 9 at its bottom. An annular airbag 8 is installed on the side of the cleaning plate 14, and the inner side of the annular airbag 8 is connected to the outer side of the cleaning plate 14. An elastic fiber bag 7 is fitted onto the cleaning plate 14, and the middle of the elastic fiber bag 7 is inserted into the slot 9. The pneumatically driven extended cleaning device 27 includes a cylinder 2, and the grip pressure device 29 includes a... The cylinder 2 is a tubular shell structure with one end sealed. The sealed end of the cylinder 2 is connected to the handle 1. Both ends of the handle 1 are connected to transmission rods 4. One end of the transmission rod 4 mates with the cleaning plate 14. A piston 3 is installed inside the cylinder 2. The side circumference of the piston 3 fits against the side circumference of the inner wall of the cylinder 2. A piston rod 5 is connected to the middle of the piston 3. One end of the piston rod 5 is connected to a finger-pressing handle 6. An air pipe 10 is installed on one side of the cylinder 2. One end of the air pipe 10 communicates with the inside of the cylinder 2, and the other end of the air pipe 10 communicates with the inside of the annular airbag 8. Several scrapers 13 are connected to the outside of the elastic fiber bag 7. The scrapers 13 are plastic sheets covered with fiber cloth. One side of the scrapers 13 is connected to the elastic fiber bag 7.

[0017] The scraper 13 of the present invention can fill the gaps at the corners of the cavity 25 during the cleaning process of the elastic fiber bag 7 on the inner wall of the cavity 25, thereby improving the cleaning effect on the gaps at the corners of the cavity 25.

[0018] Example 5: Shoe stain removal devices, such as Figures 1-2As shown, the device includes a pneumatically driven extended cleaning device 27, a pre-storage base plate device 28, and a grip pressure device 29. The pre-storage base plate device 28 includes a cleaning plate 14 with a slot 9 at its bottom. An annular airbag 8 is installed on the side of the cleaning plate 14, and the inner side of the annular airbag 8 is connected to the outer side of the cleaning plate 14. An elastic fiber bag 7 is fitted onto the cleaning plate 14, and the middle of the elastic fiber bag 7 is inserted into the slot 9. The pneumatically driven extended cleaning device 27 includes a cylinder 2, and the grip pressure device 29 includes a... The cylinder 2 is a tubular shell structure with one end sealed. The sealed end of the cylinder 2 is connected to the handle 1. Both ends of the handle 1 are connected to the transmission rod 4. One end of the transmission rod 4 is engaged with the cleaning plate 14. The piston 3 is installed inside the cylinder 2. The side of the piston 3 is in contact with the side of the inner wall of the cylinder 2. The piston rod 5 is connected to the middle of the piston 3. One end of the piston rod 5 is connected to the finger press handle 6. An air pipe 10 is installed on one side of the cylinder 2. One end of the air pipe 10 is connected to the inside of the cylinder 2, and the other end of the air pipe 10 is connected to the inside of the annular airbag 8. A linkage positioning device is installed between the transmission rod 4 and the cleaning plate 14. The linkage positioning device includes a pressure plate 15, on which a first through hole 17 and a second through hole 21 are formed. One end of the transmission rod 4 passes through the second through hole 21. Two limiting plates 20 are connected to the transmission rod 4. The transmission rod 4 passes through the middle of the limiting plate 20 and is welded to the limiting plate 20. One of the limiting plates 20 is located above the pressure plate 15. A fixing groove 19 is formed on the cleaning plate 14. The opening of the fixing groove 19 is connected to an annular plate 18. The side circumference is connected to the inner wall of the fixing groove 19. The end of the transmission rod 4 passes through the middle hole of the annular plate 18 and is connected to another limiting plate 20. The limiting plate 20 cannot pass through the middle hole of the annular plate 18, and the limiting plate 20 cannot pass through the second through hole 21. The upper part of the cleaning plate 14 is connected to the annular saw teeth 24, and the bottom of the pressure plate 15 is connected to the protrusion 22. The annular saw teeth 24 and the protrusion 22 can cooperate to clamp the elastic fiber cloth bag 7. One end of the air tube 10 can pass through the first through hole 17, and a spring-shaped area 11 is provided in the middle of the air tube 10. The cleaning plate 14 of the present invention can be provided with an air tube groove 30 adapted to the air tube 10. After the air tube 10 passes through the first through hole 17, it is inserted into the air tube groove. The end of the first through hole 17 is connected to the annular airbag 8. When the operator holds the handle 1 and presses the cleaning plate 14 into the cavity 25 of the lower template 26 with a certain pressure, the linkage positioning device can use this pressure to drive the upper part of the limiting plate 20 and the pressure plate 15 to cooperate, thereby applying pressure to the pressure plate 15 in the direction of the cleaning plate 14. At this time, the pressure plate 15 and the cleaning plate 14 can cooperate to clamp the side of the opening of the elastic fiber bag 7, thereby positioning the opening of the elastic fiber bag 7 during the inflation of the annular airbag 8, so that the elastic fiber bag 7 can expand with the expansion of the annular airbag 8, thereby making it easy for the elastic fiber bag 7 to be pulled out from the gap between the cleaning plate 14 and the lower template 26, thereby making it easy for the elastic fiber bag 7 to clean the inner wall of the cavity 25 of the lower template 26. The spring-shaped area 11 allows the handle 1 to move within a small range.

[0019] This invention provides a clear and complete description of its technical solutions in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0020] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention.

Claims

1. A shoe-making dirt removal device, characterized in that: The device includes a pneumatically driven extended cleaning device (27), a pre-storage base plate device (28), and a grip pressure device (29). The pre-storage base plate device (28) includes a cleaning plate (14), with a slot (9) at the bottom of the cleaning plate (14). An annular airbag (8) is installed on the side of the cleaning plate (14), and the inner side of the annular airbag (8) is connected to the outer side of the cleaning plate (14). An elastic fiber cloth bag (7) is fitted on the cleaning plate (14), and the middle part of the elastic fiber cloth bag (7) is inserted into the inside of the slot (9). The pneumatically driven extended cleaning device (27) includes a cylinder (2), and the grip pressure device (29) includes a handle (1). The cylinder (2) is a tubular shell structure with one end sealed. The sealed end of the cylinder (2) is connected to the handle rod (1). Both ends of the handle rod (1) are connected to the transmission rod (4). One end of the transmission rod (4) is engaged with the cleaning plate (14). The piston (3) is installed inside the cylinder (2). The side circumference of the piston (3) is in contact with the side circumference of the inner wall of the cylinder (2). The piston rod (5) is connected to the middle of the piston (3). One end of the piston rod (5) is connected to the finger press handle (6). The air pipe (10) is installed on one side of the cylinder (2). One end of the air pipe (10) is connected to the inside of the cylinder (2), and the other end of the air pipe (10) is connected to the inside of the annular airbag (8).

2. The shoe-making dirt removal device according to claim 1, characterized in that: The cleaning plate (14) has an annular groove (12) on its side. After the annular airbag (8) is inflated, the side can enter the annular groove (12).

3. The shoe-making dirt removal device according to claim 1, characterized in that: The elastic fiber bag (7) is a bag-shaped structure with an open top, made of elastic fiber cloth. An annular elastic band (23) is installed at the opening of the elastic fiber bag (7), and the side periphery of the annular elastic band (23) is connected to the side periphery of the opening of the elastic fiber bag (7).

4. The shoe-making dirt removal device according to claim 1, characterized in that: Several scrapers (13) are connected to the outside of the elastic fiber bag (7). The scrapers (13) are plastic sheets covered with fiber cloth. One side of the scrapers (13) is connected to the elastic fiber bag (7).

5. The shoe-making dirt removal device according to claim 1, characterized in that: A linkage positioning device is installed between the transmission rod (4) and the cleaning plate (14). The linkage positioning device includes a pressure plate (15), on which a first through hole (17) and a second through hole (21) are opened. One end of the transmission rod (4) passes through the second through hole (21). Two limiting plates (20) are connected to the transmission rod (4). After the transmission rod (4) passes through the middle of the limiting plate (20), it is welded to the limiting plate (20). One of the limiting plates (20) is located on the upper part of the pressure plate (15). A fixing groove (19) is opened on the cleaning plate (14). The opening of the fixing groove (19) is connected to an annular plate (18). The side periphery is connected to the inner wall periphery of the fixing groove (19). The end of the transmission rod (4) passes through the middle hole of the annular plate (18) and is connected to another limiting plate (20). The limiting plate (20) cannot pass through the middle hole of the annular plate (18). The limiting plate (20) cannot pass through the second through hole (21). The upper part of the cleaning plate (14) is connected to the annular saw teeth (24). The bottom of the pressure plate (15) is connected to the protrusion (22). The annular saw teeth (24) and the protrusion (22) can cooperate to clamp the elastic fiber cloth bag (7). One end of the air tube (10) can pass through the first through hole (17). A spring-shaped area (11) is set in the middle of the air tube (10).

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