Dryer for clothing accessories
By collecting and discharging water droplets through a condensation structure and a scraping structure, the problem of water vapor condensation and dripping is solved, ensuring the dryness of garment accessories and improving drying efficiency.
Patent Information
- Application Number
- CN202422822378.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In existing garment accessory dryers, water vapor easily condenses into water droplets and drips when it encounters low temperatures, affecting the drying effect.
The design incorporates a condensation structure, a scraping structure, and a drying structure. The condenser tube condenses water vapor, while the scraper scrapes water droplets and collects them in a water collection box, from which they are automatically discharged through a drain trough and a drain pipe.
It effectively collects and drains water droplets, preventing them from dripping and ensuring that garments and accessories remain dry, thus improving the drying effect.
Smart Images

Figure CN223500082U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of garment accessories technology, and in particular to a dryer for garment accessories. Background Technology
[0002] Garment accessories refer to all materials other than the fabric used to decorate and extend the functionality of clothing. These materials play a crucial role in the design and production of clothing and include linings, interlinings, fillings, padding, labels, belts, sewing threads, and fastening materials. To remove moisture and ensure the dryness and stability of garment accessories, thereby guaranteeing their quality and performance, a dryer is typically used.
[0003] Among existing Chinese utility models, CN216694242U discloses a drying device for garment accessories, including a box, crossbars, a horizontal plate, a hot air box, and a slide. Support legs are welded to the four corners of the bottom of the box, and crossbars are symmetrically fixed to the top two ends of the inner side of the box. This drying device for garment accessories uses a servo motor, a screw, and a limiting slider to move the slide to one side. When the slide moves to the bottom of the extrusion plate, the extrusion plate presses the slide bar, causing the upper tray to descend and stretch the spring, merging the upper and lower trays. This prevents small accessories from flying out during the drying process and improves drying efficiency. The limiting plate and air vents preheat the lower tray and small accessories, preventing damage to small accessories caused by prolonged drying. The device is simple to operate and convenient to use.
[0004] Referring to the aforementioned drying device for garment accessories, during the drying process, the moisture inside the garment accessories is dried out, forming water vapor that flows with the air. However, when the water vapor encounters low temperatures, it easily condenses into water droplets on the side walls of the drying device. As these droplets accumulate, they drip downwards, landing on the garment accessories below and re-wetting them, thus affecting the overall drying effect. Therefore, how to effectively collect the water droplets formed by the condensation of water vapor and prevent them from dripping is an important problem that needs to be solved in the design of dryers for garment accessories. Utility Model Content
[0005] This invention provides a dryer for clothing accessories to solve the problem that water vapor easily condenses into water droplets and drips downwards when it encounters low temperatures.
[0006] This utility model solves the above-mentioned technical problems through the following technical solutions:
[0007] This utility model provides a dryer for garment accessories, including a garment accessory drying shell, and further comprising:
[0008] A condensation structure is provided at the top of the garment accessories drying shell;
[0009] A drying structure is disposed inside a garment accessories drying shell;
[0010] A scraping structure is provided below the condensation structure to scrape and clean water droplets on the condensation structure.
[0011] Preferably, the top of the garment accessory drying shell is square and protrudes upward. The garment accessory drying shell is composed of an outer shell, a heat insulation layer and an inner shell. The heat insulation layer is fixedly connected to the inner wall of the outer shell, and the inner shell is fixedly connected to the inner wall of the heat insulation layer.
[0012] In this technical solution, the insulation layer can separate the internal temperature of the garment accessory drying shell from the external temperature, thus preventing the internal temperature of the garment accessory drying shell from being affected by the external temperature.
[0013] Preferably, a shielding door is rotatably connected to the front side wall of the garment accessory drying shell, and a handle is fixedly connected to the side wall of the shielding door.
[0014] In this technical solution, by opening the shielding door, the garment accessories that need to be dried can be laid on the support net.
[0015] Preferably, a fixed housing is fixedly connected to the right side wall of the garment accessory drying housing, a drainage housing is fixedly connected to the bottom side wall of the fixed housing, a drainage pipe is fixedly connected to the bottom side wall of the drainage housing, the bottom inner side wall of the drainage housing is inclined towards the drainage pipe, and a baffle is fixedly connected to the bottom inner side wall of the fixed housing.
[0016] In this technical solution, when the movable frame on the water receiving box passes the baffle, the baffle will block the movable frame.
[0017] Preferably, a support mesh is fixedly connected to the inner wall of the garment accessory drying shell.
[0018] Preferably, the condensation structure includes a vent box, an air inlet pipe, a cold air inlet pipe, and a condenser pipe. The vent box is fixedly connected to the top outer wall of the garment accessories drying shell. The air inlet pipe is fixedly connected to the side wall of the vent box. The cold air inlet pipe is fixedly connected at equal intervals to the bottom side wall of the vent box. The condenser pipe is fixedly connected to the bottom of the cold air inlet pipe. The condenser pipe is fixedly connected at equal intervals to the inner side wall of the garment accessories drying shell.
[0019] In this technical solution, the left intake pipe is connected to the external cold air pipe, and the right intake pipe is connected to the external exhaust pipe. The cold air enters the condenser through the left intake pipe, the ventilation box, and the cold air passage pipe, which lowers the temperature of the condenser. The cold air then enters the exhaust pipe from the right cold air passage pipe, the ventilation box, and the intake pipe and is discharged.
[0020] Preferably, the scraping structure includes a rotating motor, a threaded rod, a movable block, a water receiving box, a scraper, and a drainage groove. The rotating motor is fixedly connected to the inner wall of the fixed housing. The rotating end of the rotating motor is fixedly connected to the threaded rod, and the other end of the threaded rod is rotatably connected to the inner wall of the garment accessories drying housing. A movable block is threadedly connected to the threaded rod, and a water receiving box is fixedly connected between the movable blocks. A scraper is fixedly connected to the middle of the top side wall of the water receiving box, and a drainage groove is provided on the bottom side wall of the water receiving box.
[0021] Preferably, the scraper is a triangular plate, and the side wall of the scraper is provided with arc-shaped grooves at equal intervals, and the grooves on the scraper are in contact with the bottom side wall of the condenser tube.
[0022] In this technical solution, when the rotating motor rotates clockwise, it drives the threaded rod to rotate clockwise, which in turn drives the moving block to move. The moving block then drives the water collection box to move, which in turn drives the scraper to move to the left. The scraper moves to the left along the condenser tube, scraping off the water droplets on the condenser tube and collecting them in the water collection box below. When the rotating motor rotates counterclockwise, it drives the water collection box and the scraper to move to the right, similarly cleaning and collecting the water droplets on the condenser tube.
[0023] Preferably, the scraping structure includes a sliding groove, a spring, a sliding block, a movable frame, and a sealing gasket. The sliding groove is formed inside the bottom side wall of the water receiving box. A sliding block is slidably connected inside the sliding groove. A spring is fixedly connected at equal distances between the sliding block and the sliding groove. A movable frame is fixedly connected to the side wall of the sliding block. A sealing gasket is fixedly connected to the outer side wall of the movable frame. The size of the movable frame and the drainage groove are matched. The movable frame extends downward out of the water receiving box.
[0024] Preferably, the drying structure includes a first ventilation pipe, a heating pipe, an exhaust fan, an electric heating grid, a second ventilation pipe, ventilation boxes, and hot air pipes. One end of the first ventilation pipe is fixedly connected to the top side wall of the garment accessories drying shell, and the other end of the first ventilation pipe is fixedly connected to the heating pipe. The heating pipe is fixedly connected to the left side wall of the garment accessories drying shell. An exhaust fan and an electric heating grid are fixedly connected to the inner side wall of the heating pipe. Two second ventilation pipes are fixedly connected to the side wall of the heating pipe, and the other ends of the two second ventilation pipes are fixedly connected to two ventilation boxes. The two ventilation boxes are located on the upper and lower sides of the support net, and hot air pipes are fixedly connected at equal intervals on the side walls of the two ventilation boxes on opposite sides.
[0025] In this technical solution, as the water receiving box moves, the baffle blocks the moving frame, the moving frame causes the sealing gasket to retract into the sliding groove, the spring is compressed, the drain groove at the bottom of the water receiving box is opened, and the water collected in the water receiving box is discharged downward through the drain groove, falling into the drain housing below, and discharged through the drain pipe.
[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.
[0027] The positive and progressive effects of this utility model are as follows:
[0028] 1. When the motor rotates clockwise, it drives the threaded rod to rotate clockwise, which in turn moves the water collection box. The water collection box then moves the scraper to the left, following the condenser tube. The water droplets on the condenser tube are scraped off and fall into the water collection box below for collection. When the motor rotates counterclockwise, it moves the water collection box and the scraper to the right, similarly cleaning and collecting the water droplets on the condenser tube. This facilitates better collection of water droplets formed by water vapor condensation, preventing water droplets from dripping and causing the garment accessories to re-wet, thus affecting the drying effect.
[0029] 2. When the movable frame on the water receiving box of this application passes the baffle, the baffle will block the movable frame. As the water receiving box moves, the movable frame drives the sealing gasket to retract into the sliding groove, the spring is compressed, the drain groove at the bottom of the water receiving box is opened, and the water collected in the water receiving box is discharged downward through the drain groove, falling into the drain housing below, and discharged through the drain pipe, which facilitates the automatic discharge of the water collected in the water receiving box. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.
[0031] Figure 2 This is a schematic diagram of the overall internal structure of this utility model.
[0032] Figure 3 This is a side view of the internal structure of the present invention.
[0033] Figure 4 The whole of this utility model Figure 2 A magnified schematic diagram of the structure at point A.
[0034] Explanation of reference numerals in the attached figures
[0035] 1. Garment accessories drying shell; 101. Outer shell; 102. Insulation layer; 103. Inner shell; 2. Shielding door; 3. Fixed shell; 4. Drainage shell; 5. Drainage pipe; 6. Condensation structure; 601. Ventilation box; 602. Air inlet pipe; 603. Cold air duct; 604. Condensation pipe; 7. Scraper structure; 701. Rotating motor; 702. Threaded rod; 703. Moving block; 704. Water receiving box; 705. Scraper; 706. Drainage trough; 711. Sliding groove; 712. Spring; 713. Sliding block; 714. Moving frame; 715. Sealing gasket; 8. Baffle; 9. Drying structure; 901. Ventilation duct one; 902. Heating tube; 903. Exhaust fan; 904. Electric heating grid; 905. Ventilation duct two; 906. Ventilation box; 907. Hot air duct; 10. Support net. Detailed Implementation
[0036] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.
[0037] like Figure 1-4 As shown, a dryer for garment accessories includes a garment accessory drying shell 1, and further includes:
[0038] A condensation structure 6 is disposed on the top of the garment accessory drying shell 1;
[0039] Drying structure 9 is disposed inside garment accessory drying shell 1;
[0040] The scraping structure 7 is located below the condensation structure 6 and scrapes and cleans the water droplets on the condensation structure 6.
[0041] The top of the garment accessory drying shell 1 is square and protrudes upward. The garment accessory drying shell 1 is composed of an outer shell 101, a heat insulation layer 102 and an inner shell 103. The heat insulation layer 102 is fixedly connected to the inner side wall of the outer shell 101, and the inner shell 103 is fixedly connected to the inner side wall of the heat insulation layer 102.
[0042] The insulation layer 102 can separate the internal temperature of the garment accessories drying shell 1 from the external temperature, thus preventing the internal temperature of the garment accessories drying shell 1 from being affected by the external temperature.
[0043] A shielding door 2 is rotatably connected to the front side wall of the garment accessory drying shell 1, and a handle is fixedly connected to the side wall of the shielding door 2.
[0044] Open the shielding door 2, and you can lay the clothing accessories that need to be dried on the support net 10.
[0045] A fixed housing 3 is fixedly connected to the right side wall of the garment accessory drying housing 1. A drainage housing 4 is fixedly connected to the bottom side wall of the fixed housing 3. A drain pipe 5 is fixedly connected to the bottom side wall of the drainage housing 4. The bottom inner side wall of the drainage housing 4 is inclined towards the drain pipe 5. A baffle 8 is fixedly connected to the bottom inner side wall of the fixed housing 3.
[0046] When the movable bracket 714 on the water receiving box 704 passes the baffle 8, the baffle 8 will block the movable bracket 714.
[0047] A support net 10 is fixedly connected to the inner wall of the garment accessory drying shell 1.
[0048] The condensation structure 6 includes a vent box 601, an air inlet pipe 602, a cold air inlet pipe 603, and a condenser pipe 604. The vent box 601 is fixedly connected to the top outer wall of the garment accessories drying shell 1. The air inlet pipe 602 is fixedly connected to the side wall of the vent box 601. The cold air inlet pipe 603 is fixedly connected at equal intervals to the bottom side wall of the vent box 601. The condenser pipe 604 is fixedly connected to the bottom of the cold air inlet pipe 603. The condenser pipe 604 is fixedly connected at equal intervals to the inner side wall of the garment accessories drying shell 1.
[0049] Connect the left intake pipe 602 to the external cold air pipe and the right intake pipe 602 to the external exhaust pipe. Cold air enters the condenser pipe 604 through the left intake pipe 602, vent box 601 and cold air pipe 603, causing the temperature of the condenser pipe 604 to drop. The cold air then enters the exhaust pipe and is discharged from the right cold air pipe 603, vent box 601 and intake pipe 602.
[0050] The scraping structure 7 includes a rotating motor 701, a threaded rod 702, a moving block 703, a water receiving box 704, a scraper 705, and a drainage groove 706. The rotating motor 701 is fixedly connected to the inner wall of the fixed housing 3. The rotating end of the rotating motor 701 is fixedly connected to the threaded rod 702. The other end of the threaded rod 702 is rotatably connected to the inner wall of the garment accessories drying housing 1. The moving block 703 is threadedly connected to the threaded rod 702. The water receiving box 704 is fixedly connected between the moving blocks 703. The scraper 705 is fixedly connected to the middle of the top side wall of the water receiving box 704. The drainage groove 706 is provided on the bottom side wall of the water receiving box 704.
[0051] The scraper 705 is a triangular plate, and arc-shaped grooves are provided at equal intervals on the side wall of the scraper 705. The grooves on the scraper 705 fit together with the bottom side wall of the condenser tube 604.
[0052] When the motor 701 rotates clockwise, it drives the threaded rod 702 to rotate clockwise. The threaded rod 702 drives the moving block 703 to move, and the moving block 703 drives the water collection box 704 to move. The water collection box 704 drives the scraper 705 to move to the left. The scraper 705 moves to the left along the condenser tube 604, and the water droplets on the condenser tube 604 are scraped off and fall into the water collection box 704 below for collection. When the motor 701 rotates counterclockwise, it drives the water collection box 704 and the scraper 705 to move to the right, and similarly cleans and collects the water droplets on the condenser tube 604.
[0053] The scraping structure 7 includes a sliding groove 711, a spring 712, a sliding block 713, a movable frame 714, and a sealing gasket 715. The sliding groove 711 is formed in the bottom side wall of the water receiving box 704. The sliding block 713 is slidably connected in the sliding groove 711. The spring 712 is fixedly connected at equal distances between the sliding block 713 and the sliding groove 711. The movable frame 714 is fixedly connected to the side wall of the sliding block 713. The sealing gasket 715 is fixedly connected to the outer side wall of the movable frame 714. The size of the movable frame 714 and the drainage groove 706 are matched. The movable frame 714 extends downward out of the water receiving box 704.
[0054] The drying structure 9 includes a first ventilation pipe 901, a heating pipe 902, an exhaust fan 903, an electric heating grid 904, a second ventilation pipe 905, a ventilation box 906, and a hot air pipe 907. One end of the first ventilation pipe 901 is fixedly connected to the top side wall of the garment accessories drying shell 1, and the other end of the first ventilation pipe 901 is fixedly connected to the heating pipe 902. The heating pipe 902 is fixedly connected to the left side wall of the garment accessories drying shell 1. The exhaust fan 903 and the electric heating grid 904 are fixedly connected to the inner side wall of the heating pipe 902. Two second ventilation pipes 905 are fixedly connected to the side wall of the heating pipe 902. The other ends of the two second ventilation pipes 905 are fixedly connected to two ventilation boxes 906. The two ventilation boxes 906 are located on the upper and lower sides of the support net 10. Hot air pipes 907 are fixedly connected at equal intervals on the side walls of the two ventilation boxes 906 on opposite sides.
[0055] As the water receiving box 704 moves, the baffle 8 blocks the moving frame 714, and the moving frame 714 causes the sealing gasket 715 to retract into the sliding groove 711. The spring 712 is compressed, and the drain groove 706 at the bottom of the water receiving box 704 is opened. The water collected in the water receiving box 704 is discharged downward through the drain groove 706 and falls into the drain housing 4 below, and is discharged through the drain pipe 5.
[0056] In use, all electrical components mentioned in this application are connected to an external power supply and control switch. When the shielding door 2 is opened, the garment accessories to be dried are laid on the support net 10. The exhaust fan 903 draws air, and the electric heating net 904 heats the air. The hot air is blown out onto the garment accessories on the support net 10 through the second ventilation pipe 905, the ventilation box 906, and the hot air pipe 907 to dry the garment accessories. The water vapor generated during drying floats upward with the suction of the first ventilation pipe 901. The heat insulation layer 102 can separate the internal temperature of the garment accessory drying shell 1 from the external temperature, so as to prevent the internal temperature of the garment accessory drying shell 1 from being affected by the external temperature.
[0057] Connect the left intake pipe 602 to the external cold air pipe and the right intake pipe 602 to the external exhaust pipe. Cold air enters the condenser 604 through the left intake pipe 602, the ventilation box 601 and the cold air pipe 603, which lowers the temperature of the condenser 604. When the water vapor floats upward and passes through the condenser 604, the water in the water vapor condenses into small water droplets due to the low temperature and adheres to the side wall of the condenser 604.
[0058] When the rotating motor 701 rotates clockwise, it drives the threaded rod 702 to rotate clockwise. The threaded rod 702 drives the moving block 703 to move, and the moving block 703 drives the water collection box 704 to move. The water collection box 704 drives the scraper 705 to move to the left. The scraper 705 moves to the left along the condenser tube 604, and the water droplets on the condenser tube 604 are scraped off and fall into the water collection box 704 below for collection. When the rotating motor 701 rotates counterclockwise, it drives the water collection box 704 and the scraper 705 to move to the right, and similarly cleans and collects the water droplets on the condenser tube 604. This effectively collects the water droplets formed by the condensation of water vapor, preventing water droplets from dripping and causing the garment accessories to be re-wetted, which would affect the drying effect.
[0059] When the movable frame 714 on the water receiving box 704 passes the baffle 8, the baffle 8 will block the movable frame 714. As the water receiving box 704 moves, the movable frame 714 drives the sealing gasket 715 to retract into the sliding groove 711, the spring 712 is compressed, the drain groove 706 at the bottom of the water receiving box 704 is opened, and the water collected in the water receiving box 704 is discharged downward through the drain groove 706 and falls into the drain housing 4 below, and is discharged through the drain pipe 5. This can effectively make the water collected in the water receiving box 704 automatically discharged.
[0060] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.
Claims
1. A dryer for garment accessories, comprising a garment accessory drying shell (1), characterized in that, Also includes: A condensation structure (6) is provided on the top of the garment accessories drying shell (1); Drying structure (9), wherein the drying structure (9) is disposed inside the garment accessory drying shell (1); A scraping structure (7) is provided below the condensation structure (6) to scrape and clean the water droplets on the condensation structure (6).
2. The dryer for garment accessories as described in claim 1, characterized in that: The top of the garment accessory drying shell (1) is square and protrudes upward. The garment accessory drying shell (1) is composed of an outer shell (101), a heat insulation layer (102) and an inner shell (103). The heat insulation layer (102) is fixedly connected to the inner side wall of the outer shell (101), and the inner shell (103) is fixedly connected to the inner side wall of the heat insulation layer (102).
3. The dryer for garment accessories as described in claim 1, characterized in that: A shielding door (2) is rotatably connected to the front side wall of the garment accessory drying shell (1), and a handle is fixedly connected to the side wall of the shielding door (2).
4. The dryer for garment accessories as described in claim 1, characterized in that: A fixed housing (3) is fixedly connected to the right side wall of the garment accessory drying housing (1). A drainage housing (4) is fixedly connected to the bottom side wall of the fixed housing (3). A drain pipe (5) is fixedly connected to the bottom side wall of the drainage housing (4). The bottom inner side wall of the drainage housing (4) is inclined towards the drain pipe (5). A baffle (8) is fixedly connected to the bottom inner side wall of the fixed housing (3).
5. The dryer for garment accessories as described in claim 1, characterized in that: A support mesh (10) is fixedly connected to the inner wall of the garment accessory drying shell (1).
6. The dryer for garment accessories as described in claim 1, characterized in that: The condensation structure (6) includes a ventilation box (601), an air inlet pipe (602), a cold air inlet pipe (603), and a condenser pipe (604). The ventilation box (601) is fixedly connected to the top outer wall of the garment accessories drying shell (1). The air inlet pipe (602) is fixedly connected to the side wall of the ventilation box (601). The cold air inlet pipe (603) is fixedly connected at equal intervals to the bottom side wall of the ventilation box (601). The condenser pipe (604) is fixedly connected to the bottom of the cold air inlet pipe (603). The condenser pipe (604) is fixedly connected at equal intervals to the inner side wall of the garment accessories drying shell (1).
7. The dryer for garment accessories as described in claim 1, characterized in that: The scraping structure (7) includes a rotating motor (701), a threaded rod (702), a moving block (703), a water receiving box (704), a scraper (705), and a drainage groove (706). The rotating motor (701) is fixedly connected to the inner wall of the fixed housing (3). The rotating end of the rotating motor (701) is fixedly connected to the threaded rod (702). The other end of the threaded rod (702) is rotatably connected to the inner wall of the garment accessories drying housing (1). The moving block (703) is threadedly connected to the threaded rod (702). The water receiving box (704) is fixedly connected between the moving blocks (703). The scraper (705) is fixedly connected to the middle of the top side wall of the water receiving box (704). The drainage groove (706) is provided on the bottom side wall of the water receiving box (704).
8. The dryer for garment accessories as described in claim 7, characterized in that: The scraper (705) is a triangular plate, and the scraper (705) has arc-shaped grooves at equal intervals on its side wall. The grooves on the scraper (705) fit together with the bottom side wall of the condenser tube (604).
9. The dryer for garment accessories as described in claim 7, characterized in that: The scraping structure (7) includes a sliding groove (711), a spring (712), a sliding block (713), a movable frame (714), and a sealing gasket (715). The sliding groove (711) is opened in the bottom side wall of the water receiving box (704). The sliding block (713) is slidably connected in the sliding groove (711). The spring (712) is fixedly connected at equal distances between the sliding block (713) and the sliding groove (711). The movable frame (714) is fixedly connected to the side wall of the sliding block (713). The sealing gasket (715) is fixedly connected to the outer side wall of the movable frame (714). The size of the movable frame (714) and the drain groove (706) are matched. The movable frame (714) extends downward out of the water receiving box (704).
10. The dryer for garment accessories as described in claim 1, characterized in that: The drying structure (9) includes a ventilation pipe (901), a heating pipe (902), an exhaust fan (903), an electric heating grid (904), a second ventilation pipe (905), a ventilation box (906), and a hot air pipe (907). One end of the first ventilation pipe (901) is fixedly connected to the top side wall of the garment accessories drying shell (1), and the other end of the first ventilation pipe (901) is fixedly connected to the heating pipe (902). The heating pipe (902) is fixedly connected to the garment accessories drying shell (1). On the left side wall, an exhaust fan (903) and an electric heating grid (904) are fixedly connected to the inner side wall of the heating tube (902). Two ventilation pipes (905) are fixedly connected to the side wall of the heating tube (902). Two ventilation boxes (906) are fixedly connected to the other end of the two ventilation pipes (905). The two ventilation boxes (906) are located on the upper and lower sides of the support net (10). Hot air pipes (907) are fixedly connected at equal distances on the side walls of the two ventilation boxes (906) on opposite sides.