A drying device for plastic woven bag production

Abstract

The application relates to the field of plastic woven bag production devices, and particularly discloses a drying device for plastic woven bag production. The drying device for plastic woven bag production comprises a base, the upper side of the base is connected with a support, the support is connected with a drying back for contact of flat filaments; the drying back is provided with at least two oil cavities along the conveying direction of the flat filaments, the oil cavities are internally filled with heat-conducting oil, the oil cavities are mutually isolated, and the drying back is connected with an electric heating pipe located in the oil cavities. The application adopts heat-conducting oil as a heating and drying medium and is provided with multiple independent heating areas, which are more energy-saving compared with a radiation heating mode on one hand, and can realize step-by-step accurate temperature control and avoid excessive drying of the flat filaments on the other hand.

Description

Technical Field

[0001] This application relates to the field of plastic woven bag production equipment, and more particularly to a drying device for plastic woven bag production. Background Technology

[0002] Plastic woven bags are a widely used type of packaging bag, mainly made of plastic particles such as polypropylene (PP) or polyethylene (PE) through specific processes. They are characterized by durability, light weight, low cost, and a certain degree of breathability and moisture resistance, making them commonly used for packaging grains, fertilizers, cement, sand, gravel, chemical products, and other items.

[0003] The production process of plastic woven bags includes the following steps: 1. Plastic particles are melted and extruded into plastic film; 2. The plastic film is cooled and cut into raw yarn; 3. The raw yarn is stretched to form flat yarn; 4. The flat yarn is woven into tubular fabric using a circular loom; 5. The tubular fabric is cut into the corresponding size and sewn into bags using a sewing machine.

[0004] In some production processes, flat yarns need to be washed with water before being woven into tubular fabric to ensure surface cleanliness. Because plastic flat yarns have a certain degree of water absorption, their strength decreases and they are prone to breakage after absorbing water, therefore timely drying is necessary. Currently, the commonly used drying equipment for plastic flat yarns is a radiant electric heater, which has the following technical drawbacks: low temperature control precision and difficulty in setting gradually varying temperature gradients, leading to over-drying of the plastic flat yarns, resulting in excessively low moisture content and consequently affecting the yarn's toughness. Summary of the Invention

[0005] To achieve precise, step-by-step temperature control, this application provides a drying apparatus for the production of plastic woven bags.

[0006] The drying device for producing plastic woven bags provided in this application adopts the following technical solution: A drying device for producing plastic woven bags includes a base, a support connected to the upper side of the base, and a drying back for contacting flat yarns connected to the support. The drying back is provided with at least two oil chambers along the flat wire conveying direction. The oil chambers are filled with heat-conducting oil and are isolated from each other. The drying back is connected to an electric heating tube located in the oil chamber.

[0007] By adopting the above technical solution, the heat transfer oil is heated to the required temperature using an electric heating element, and drying is achieved through temperature conduction via the heat transfer oil. On the one hand, the heat transfer efficiency of heat transfer oil is higher than that of air, thus it is more energy-efficient than radiant heating; on the other hand, the specific heat capacity of heat transfer oil is greater than that of air, resulting in gentler temperature fluctuations, which is conducive to precise temperature control and avoids over-drying of the flat wires.

[0008] In addition, the multiple oil chambers are isolated from each other and can be heated independently to achieve step-by-step temperature control. This allows for a drying method that first uses high temperature and then low temperature to ensure that the moisture content of the flat yarn is controlled at an ideal level.

[0009] Optionally, an oil tank is provided on one side of the drying back, with the bottom of the oil tank higher than the drying back. An oil inlet and an air outlet are provided on one side of the drying back, both of which are connected to the oil cavity. An oil inlet pipe is connected between the oil tank and the oil inlet, and an oil inlet valve is connected to the oil inlet pipe. An air outlet pipe is connected between the oil tank and the air outlet, and an air outlet valve is connected to the air outlet pipe. An oil drain port is provided on the drying back, communicating with the bottom of the oil cavity. An oil drain pipe is connected to the oil drain port, and an oil drain valve is connected to the oil drain pipe.

[0010] By adopting the above technical solution, the inlet valve and outlet valve are opened, and the height difference is used to naturally guide the heat transfer oil in the oil tank into the oil chamber. The air in the oil chamber is then discharged back into the oil tank through the outlet, facilitating the oil filling operation. When it is necessary to replace the heat transfer oil, the drain valve is opened first to drain the heat transfer oil from the oil chamber.

[0011] Optionally, both the oil inlet pipe and the air outlet pipe are connected to the bottom of the oil tank, and a vertically arranged air guide pipe is connected to the bottom wall of the oil tank, and the air guide pipe is connected to the air outlet pipe.

[0012] By adopting the above technical solution, the outlet of the air guide pipe is higher than the liquid level in the oil tank, which can balance the air pressure inside the oil chamber and inside the oil tank through the air guide pipe, thereby facilitating the rapid injection of heat transfer oil into the oil chamber.

[0013] Optionally, the upper surface of the drying back is an arc-shaped surface that is high in the middle and low on both sides, and the oil inlet is lower than the corresponding air outlet connected to the same oil chamber.

[0014] By adopting the above technical solution, the contact area between the drying back and the flat wire is increased, the tightness of the fit between the flat wire and the drying back is improved, and air exhaust is facilitated.

[0015] Optionally, a fixed frame is fixedly connected to one side of the base, and a rotating frame is rotatably connected to the fixed frame via a hinge shaft. A sealing plate is fixedly connected to one end of the rotating frame, and a driving cylinder is provided at the other end. The sealing plate is located on the upper side of the drying back. The cylinder body of the driving cylinder is fixedly connected to the base, and a rotating shaft is fixedly connected to the piston rod. The rotating frame is provided with an oblong hole for the rotating shaft to pass through.

[0016] By adopting the above technical solution, the sealing plate can semi-enclose the drying area, reducing heat loss and thus lowering energy consumption. Starting the drive cylinder rotates the sealing plate, facilitating threading during machine startup.

[0017] Optionally, the oil tank is connected to a base frame, the base frame is fixedly connected to a base, the upper end of the oil tank is provided with a tank cover, and the middle of the tank cover is provided with an oil filling hole.

[0018] By adopting the above technical solution, the oil tank is open, and the condition of the heat transfer oil inside can be seen by opening the tank cover.

[0019] Optionally, a connecting frame is fitted around the outside of the oil tank, the connecting frame is fixedly connected to the rotating frame, a through hole is provided at the upper end of the side of the oil tank near the back of the oven, a transparent sight glass is provided at the top of the oil tank, and the oil drain pipe can be connected to the oil tank.

[0020] By adopting the above technical solution, the oil tank is enclosed, and the condition of the heat transfer oil inside can be seen through a transparent sight glass. The oil tank can rotate with the rotating frame, thus rotating from above the drying back to below the drying back, so that the heat transfer oil can be drained back into the oil tank. This facilitates observation and sampling of the heat transfer oil that has been used for a period of time, and then decides whether to replace it based on the usage condition.

[0021] Optionally, the oil tank is slidably connected to the connecting frame, the oil tank is fixedly connected to a rack, the hinge shaft is fixedly connected to a drive gear, a first rotating rod and a second rotating rod are rotatably connected between the two rotating frames, the first rotating rod is fixedly connected to a driven gear, the second rotating rod is fixedly connected to a drive gear and a reversing gear, the driven gear meshes with the drive gear, the reversing gear meshes with the driven gear, and the drive gear meshes with the rack.

[0022] By adopting the above technical solution, firstly, through gear transmission, the oil tank gradually approaches the drying back during rotation, which facilitates reducing the distance between the oil tank and the drying back, and thus facilitates the connection between the oil drain pipe and the air outlet pipe; secondly, by utilizing the weight of the oil tank itself, the weight of the sealing plate is balanced, which facilitates the driving cylinder to rotate the sealing plate.

[0023] Optionally, the drying back includes a first side plate, a second side plate, a top plate, and a cavity plate. The first side plate and the second side plate are arranged opposite to each other. The top plate is connected between the first side plate and the second side plate. The cavity plate is connected between the first side plate and the second side plate and its two ends are connected to the top plate. The oil cavity is formed between the cavity plate and the top plate. The bottom of the cavity plate is provided with reinforcing ribs.

[0024] Optionally, the cavity plates are spaced apart along the flat wire conveying direction.

[0025] By adopting the above technical solution, each heating zone is independent, which is conducive to precise and step-by-step temperature control.

[0026] In summary, this application has the following beneficial effects: This application uses heat transfer oil as the heating and drying medium and has multiple independent heating zones. On the one hand, it is more energy-efficient than radiant heating, and on the other hand, it can achieve precise temperature control at each stage to avoid over-drying of flat wires. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the drying device for producing plastic woven bags according to Embodiment 1 of this application, with the sealing plate in a closed state; Figure 2 This is a schematic diagram of the drying device for producing plastic woven bags according to Embodiment 1 of this application, with the sealing plate in the open state; Figure 3 This is a schematic diagram of the back-side drying structure from a first-view perspective of Embodiment 1 of this application; Figure 4 This is a schematic diagram of the back-side drying structure from a second perspective in Embodiment 1 of this application; Figure 5 This is a cross-sectional schematic diagram of the back of the oven in Embodiment 1 of this application; Figure 6 This is a schematic diagram of the back side of the drying apparatus for producing plastic woven bags according to Embodiment 1 of this application; Figure 7 This is a schematic diagram of the fuel tank structure of Embodiment 1 of this application; Figure 8 This is a partial structural schematic diagram of the drying device for producing plastic woven bags according to Embodiment 1 of this application; Figure 9 This is a side view schematic diagram of the drying apparatus for producing plastic woven bags according to Embodiment 2 of this application; Figure 10 This is a schematic diagram of the structure of the drying device for producing plastic woven bags according to Embodiment 2 of this application; Figure 11 yes Figure 10 Enlarged view of region A in the middle; Figure 12 This is a schematic diagram of the structure of the fuel tank in Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Base; 2. Support; 3. Drying back; 31. Oil cavity; 32. Oil inlet; 33. Air outlet; 34. Oil drain outlet; 35. Detection port; 301. First side plate; 302. Second side plate; 303. Top plate; 304. Cavity plate; 305. Reinforcing rib; 4. Electric heating element; 5. Oil tank; 51. Air guide pipe; 52. Tank cover; 521. Oil filling hole; 53. Through hole; 54. Transparent sight glass; 6. Oil inlet pipe; 7. Oil inlet valve; 8. Air outlet pipe; 9. Air outlet valve; 10. Oil drain pipe; 11. Oil drain valve; 12. Fixing frame; 13. Hinge shaft; 14. Rotating frame; 141. Waist-shaped hole; 15. Sealing plate; 16. Drive cylinder; 161. Rotating shaft; 17. Base frame; 18. Connecting frame; 19. Rack; 20. Drive gear; 21. First rotating rod; 22. Driven gear; 23. Drive gear; 24. Second rotating rod; 25. Reversing gear. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-12 This application will be described in further detail.

[0030] This application discloses a drying apparatus for the production of plastic woven bags.

[0031] Example 1: Reference Figure 1 , Figure 2 A drying device for producing plastic woven bags includes a base 1, a support 2 fixedly connected to the upper side of the base 1, and a drying back 3 fixedly connected to the inner side of the support. The drying back 3 is used to allow flat yarns to come into contact with and dry them. A sealing plate 15 is provided on the upper side of the drying back 3, which covers the drying back 3 to reduce heat loss. The flat yarns can pass between the sealing plate 15 and the drying back 3.

[0032] Reference Figure 3 , Figure 4 The drying back 3 includes a first side plate 301, a second side plate 302, a top plate 303, and a cavity plate 304. The first side plate 301 and the second side plate 302 are arranged parallel to each other. The top plate 303 is fixedly connected between the first side plate 301 and the second side plate 302. The top plate 303 is an arc-shaped plate that arches upwards. Therefore, the upper surface of the drying back 3 is an arc-shaped surface with a higher center and lower sides, which increases the contact area between the drying back 3 and the flat wire and improves the tightness of the fit between the flat wire and the drying back 3. The cavity plate 304 is fixedly connected between the first side plate 301 and the second side plate 302. The cavity plate 304 is located below the top plate 303 and is fixedly connected to the top plate 303 at both ends. A reinforcing rib 305 is fixedly connected to the bottom of the cavity plate 304. The reinforcing rib 305 has a U-shaped cross-section.

[0033] In this embodiment, two cavity plates 304 are spaced apart along the flat wire conveying direction. In other embodiments, the number of cavity plates 304 may be three, four or more.

[0034] Reference Figure 5 The closed cavity formed by the first side plate 301, the second side plate 302, the top plate 303, and the cavity plate 304 is called the oil cavity 31, which is filled with heat-conducting oil. The oil cavities 31 are isolated from each other, thus each oil cavity 31 is an independent heating area. The number of oil cavities 31 corresponds to the number of cavity plates 304; therefore, the number of cavity plates 304 determines the number of independent heating areas, suitable for the specific needs of different materials.

[0035] Reference Figure 3 , Figure 5The back of the drying chamber 3 is fixedly connected to an electric heating tube 4 located within the oil cavity 31. The first side plate 301 is provided with a socket for inserting the heating tube 4. The electric heating tube 4 heats the heat transfer oil to the required temperature, and drying is achieved through temperature conduction via the heat transfer oil. On one hand, the heat transfer efficiency of the heat transfer oil is higher than that of air, making it more energy-efficient than radiant heating. On the other hand, the specific heat capacity of the heat transfer oil is greater than that of air, resulting in gentler temperature fluctuations, which is conducive to precise temperature control and avoids over-drying of the flat yarn. Multiple oil cavities 31 are isolated from each other and can be heated independently, achieving step-by-step temperature control. This allows for a high-temperature followed by a low-temperature drying method, ensuring that the moisture content of the flat yarn is controlled at an ideal level. The first side plate 301 is provided with a detection port 35 communicating with the oil cavity 31. The detection port 35 is used to connect a temperature sensor for controlling the heating temperature.

[0036] Reference Figure 3 , Figure 6 An oil tank 5 is provided on one side of the drying back 3, and a base frame 17 is fixedly connected between the bottom of the oil tank 5 and the base 1. The bottom of the oil tank 5 is higher than the drying back 3. The first side plate 301 is provided with an oil inlet 32 ​​and an air outlet 33, both of which are connected to the oil chamber 31. Each oil chamber 31 corresponds to one oil inlet 32 ​​and one air outlet 33. An oil inlet pipe 6 is connected between the bottom of the oil tank 5 and the oil inlet 32, and the oil inlet pipe 6 is connected to an oil inlet valve 7. An air outlet pipe 8 is connected between the bottom of the oil tank 5 and the air outlet 33, and the air outlet pipe 8 is connected to an air outlet valve 9. The cavity plate 304 is provided with an oil drain port 34 that is connected to the bottom of the oil chamber 31. The oil drain port 34 is connected to an oil drain pipe 10, and the oil drain pipe 10 is connected to an oil drain valve 11.

[0037] Open the oil inlet valve 7 and the air outlet valve 9. Utilizing the height difference, the heat transfer oil in the oil tank 5 is naturally guided into the oil chamber 31. The air in the oil chamber 31 is then discharged back into the oil tank 5 through the air outlet 33, facilitating the oil filling operation. When it is necessary to replace the heat transfer oil, first open the oil drain valve 11 to drain the heat transfer oil from inside the oil chamber 31.

[0038] Reference Figure 3 , Figure 7 The oil inlet 32 ​​is lower than the corresponding air outlet 33 connected to the same oil chamber 31. A vertically arranged air guide pipe 51 is fixedly connected to the bottom wall of the oil tank 5, and the air guide pipe 51 is connected to the air outlet pipe 8. The air outlet 33 of the air guide pipe 51 is higher than the liquid level in the oil tank 5, so that the air pressure inside the oil chamber 31 and the oil tank 5 can be balanced through the air guide pipe 51, thereby facilitating the rapid injection of heat transfer oil into the oil chamber 31. A tank cover 52 is provided at the upper end of the oil tank 5, and an oil filling hole 521 is provided in the middle of the tank cover 52.

[0039] Reference Figure 2 , Figure 8To facilitate wire threading during startup, a fixed frame 12 is fixedly connected to one side of the base 1. The fixed frame 12 is rotatably connected to a rotating frame 14 via a hinge shaft 13. The upper end of the rotating frame 14 is fixedly connected to the sealing plate 15, and the lower end is equipped with a drive cylinder 16. The cylinder body of the drive cylinder 16 is fixedly connected to the base 1, and the piston rod is horizontally positioned and fixedly connected to a rotating shaft 161. The rotating frame 14 is provided with an oblong hole 141 for the rotating shaft 161 to pass through, and the oblong hole 141 is vertically positioned. Activating the drive cylinder 16 pulls the lower end of the rotating frame 14 closer to the base 1, thereby causing the sealing plate 15 to rotate away from the drying back 3, increasing the gap between the sealing plate 15 and the drying back 3, making it easier for the flat wire to pass through.

[0040] The implementation principle is as follows: After the two oil chambers 31 are filled with heat-conducting oil, they are heated by electric heating tubes 4. The temperatures of the two heating zones can be set independently according to requirements, such as 100℃ and 80℃. First, high-temperature drying is performed, and then low-temperature water control is applied to ensure the strength of the flat wire.

[0041] Example 2: The only difference from Embodiment 1 is that the oil tank 5 is not fixed, and its position can move with the rotating frame 14.

[0042] Based on this, the structure of fuel tank 5 is different, changing from an open type to a closed type. (Refer to...) Figure 10 , Figure 12 An through hole 53 is provided on the upper part of the oil tank 5 near the back of the drying rack 3, and a transparent sight glass 54 is provided on the top of the oil tank 5, so that the heat transfer oil inside the oil tank 5 will not flow out during the movement of the oil tank 5. The base frame 17 is eliminated, and a connecting frame 18 is slidably sleeved on the outside of the oil tank 5. The connecting frame 18 is fixedly connected between the two rotating frames 14.

[0043] Therefore, the oil tank 5 can rotate with the rotating frame 14, thereby rotating the oil tank 5 from above the back of the drying rack 3 to below the back of the drying rack 3, so that the heat transfer oil can be drained back into the oil tank 5, making it convenient to observe and sample the heat transfer oil that has been used for a period of time, and then decide whether to replace it based on the usage.

[0044] Reference Figure 9 , Figure 11The hinge shaft 13 is fixedly connected to the fixed frame 12 and rotatably connected to the rotating frame 14. A drive gear 20 is fixedly sleeved at one end of each hinge shaft 13 facing each other. A first rotating rod 21 and a second rotating rod 24 are rotatably connected between the two rotating frames 14. A driven gear 22 is fixedly connected to the first rotating rod 21, and a drive gear 23 and a reversing gear 25 are fixedly connected to the second rotating rod 24. The driven gear 22 meshes with the drive gear 20, and the reversing gear 25 meshes with the driven gear 22. Two racks 19 are fixedly connected to the bottom of the oil tank 5, and the drive gear 23 meshes with the racks 19. The oil inlet pipe 6, the vent pipe 8, and the drain pipe 10 are all flexible hoses, which do not affect the movement of the oil tank 5. The drain pipe 10 can be threadedly connected to the vent pipe 8 interface of the oil tank 5, making it convenient to connect the drain pipe 10 to the oil tank 5 after unscrewing the vent pipe 8.

[0045] Therefore, during the process of the oil tank 5 rotating from above the back of the oven 3 to below the back of the oven 3, the driving gear 20 remains stationary, while the driven gear 22 rotates around the driving gear 20 and rotates around its own axis. The reversing gear 25 rotates in the opposite direction to the driven gear 22, thereby driving the drive gear 23 to rotate, causing the rack 19 to move closer to the base 1, thus causing the oil tank 5 to move closer to the base 1, reducing the distance between the oil tank 5 and the back of the oven 3, so that the oil inlet pipe 6 and the air outlet pipe 8 do not need to be set too long.

[0046] The implementation principle is as follows: When it is necessary to check the heat transfer oil, first start the drive cylinder 16 to drive the sealing plate 15 and the rotating frame 14 to rotate 90 degrees, so that the oil tank 5 rotates from above the drying back 3 to below the drying back 3. Then open the oil inlet valve 7, and the heat transfer oil in the oil chamber 31 flows back to the oil tank 5. Observe the state of the heat transfer oil through the transparent sight glass 54, and take a sample for inspection through the through hole 53.

[0047] If the heat transfer oil is still usable, drive cylinder 16 to reset oil tank 5 and drain the heat transfer oil back into oil chamber 31. If the heat transfer oil is unusable, unscrew vent pipe 8, connect drain pipe 10 to oil tank 5, open drain valve 11 to completely drain the heat transfer oil in oil chamber 31, then close drain valve 11 and inlet valve 7, drive cylinder 16 to reset oil tank 5, place waste oil collection box directly below oil tank 5, unscrew drain pipe 10 to completely drain the heat transfer oil, finally connect vent pipe 8, inject new heat transfer oil, open vent valve 9 and inlet valve 7, and refill oil chamber 31.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drying device for producing plastic woven bags, comprising a base (1), characterized in that: The base (1) is connected to a bracket (2) on its upper side, and the bracket (2) is connected to a drying back (3) for contacting the flat wires; The back drying unit (3) is provided with at least two oil chambers (31) along the flat wire conveying direction. The oil chambers (31) are filled with heat-conducting oil. The oil chambers (31) are isolated from each other. The back drying unit (3) is connected to an electric heating tube (4) located in the oil chamber (31). An oil tank (5) is provided on one side of the drying back (3), the bottom of the oil tank (5) is higher than the drying back (3), an oil inlet (32) and an air outlet (33) are provided on one side of the drying back (3), the oil inlet (32) and the air outlet (33) are both connected to the oil cavity (31), an oil inlet pipe (6) is connected between the oil tank (5) and the oil inlet (32), the oil inlet pipe (6) is connected to an oil inlet valve (7), an air outlet pipe (8) is connected between the oil tank (5) and the air outlet (33), the air outlet pipe (8) is connected to an air outlet valve (9), the drying back (3) is provided with an oil drain port (34) that is connected to the bottom of the oil cavity (31), the oil drain port (34) is connected to an oil drain pipe (10), the oil drain pipe (10) is connected to an oil drain valve (11); A fixed frame (12) is fixedly connected to one side of the base (1). The fixed frame (12) is rotatably connected to a rotating frame (14) via a hinge shaft (13). A sealing plate (15) is fixedly connected to one end of the rotating frame (14), and a driving cylinder (16) is provided at the other end. The sealing plate (15) is located on the upper side of the drying back (3). The cylinder body of the driving cylinder (16) is fixedly connected to the base (1), and the piston rod is fixedly connected to a rotating shaft (161). The rotating frame (14) is provided with an oblong hole (141) through which the rotating shaft (161) passes. A connecting frame (18) is fitted around the outside of the oil tank (5). The connecting frame (18) is fixedly connected to the rotating frame (14). A through hole (53) is provided on the upper end of the side of the oil tank (5) near the back of the drying rack (3). A transparent sight glass (54) is provided on the top of the oil tank (5). The oil drain pipe (10) can be connected to the oil tank (5). The oil tank (5) is slidably connected to the connecting frame (18). The oil tank (5) is fixedly connected to a rack (19). The hinge shaft (13) is fixedly connected to a drive gear (20). The two rotating frames (14) are rotatably connected to a first rotating rod (21) and a second rotating rod (24). The first rotating rod (21) is fixedly connected to a driven gear (22). The second rotating rod (24) is fixedly connected to a drive gear (23) and a reversing gear (25). The driven gear (22) meshes with the drive gear (20). The reversing gear (25) meshes with the driven gear (22). The drive gear (23) meshes with the rack (19).

2. The drying device for producing plastic woven bags according to claim 1, characterized in that: The oil inlet pipe (6) and the air outlet pipe (8) are both connected to the bottom of the oil tank (5). The bottom wall of the oil tank (5) is connected to a vertically arranged air guide pipe (51), which is connected to the air outlet pipe (8).

3. The drying device for producing plastic woven bags according to claim 1, characterized in that: The upper surface of the back dryer (3) is arc-shaped with a high center and low sides, and the oil inlet (32) is lower than the corresponding air outlet (33) connected to the same oil chamber (31).

4. The drying device for producing plastic woven bags according to claim 1, characterized in that: The drying back (3) includes a first side plate (301), a second side plate (302), a top plate (303), and a cavity plate (304). The first side plate (301) and the second side plate (302) are arranged opposite to each other. The top plate (303) is connected between the first side plate (301) and the second side plate (302). The cavity plate (304) is connected between the first side plate (301) and the second side plate (302) and its two ends are connected to the top plate (303). The oil cavity (31) is formed between the cavity plate (304) and the top plate (303). The bottom of the cavity plate (304) is provided with reinforcing ribs (305).

5. The drying device for producing plastic woven bags according to claim 4, characterized in that: The cavity plates (304) are spaced apart along the flat wire conveying direction.

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