Feeding system for automatic natural rubber crepe sheet drying system

By designing an automatic drying system, the materials are automatically transported to the drying box using chain conveying and transfer devices, and the drying temperature is controlled by electrical energy and the hot air is recycled, the problems of low manual operation efficiency, high equipment cost and environmental protection in the existing technology are solved, and an efficient, automated and environmentally friendly drying process is achieved.

CN222904591UActive Publication Date: 2025-05-27YUNNAN KUNMING SHIPBUILDING DESIGN & RESEARCH INSTITUTE
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Patent Information

Application Number
CN202421463866.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-25
Publication Date
2025-05-27
Estimated Expiration
2034-06-25

AI Technical Summary

Technical Problem

In the production process of existing natural rubber crepe films, manual operation efficiency is low, mechanical equipment costs are high, and the land cover is large. The traditional drying method has the problem of difficult to accurately control the hot air temperature and high environmental protection treatment costs.

Method used

A natural rubber crepe film automatic drying system is designed, and the materials are automatically transported to the drying box using chain conveying and transfer devices, the drying temperature is controlled by using electrical energy, and the exhaust gas heat energy is recovered by recycling hot air, reducing energy consumption and environmentally friendly treatment costs.

Benefits of technology

It improves the automation level of production and processing, improves work efficiency, reduces energy consumption and environmental protection costs, and solves the problems of temperature control and environmental protection in traditional drying methods.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model discloses a feeding system for a natural rubber crepe sheet automatic drying system. Comprising a feeding system used for feeding incoming materials into a drying box body for drying; the drying box body comprises a feeding door, a box body conveying system and a discharging door; the box body conveying system is arranged at the top in the drying box body, and rubber materials can move in the drying box body through the box body conveying system; the vacuumizing system can vacuumize the interior of the drying box body; the heat supply system comprises an air inlet pipe and an air outlet pipe and is used for introducing hot air into the drying box body and then drying the film; and the discharging system is used for transferring the films conveyed by the box body conveying system to the finished product material conveying part, and finally the films are manually packaged and processed. Compared with the existing drying technology for the natural rubber crepe sheet, the drying device disclosed by the utility model can dry the crepe sheet at a relatively low temperature by using a method of combining hot air heating with vacuum drying, so that the accurate control on the material temperature is facilitated, and the quality and the performance of the rubber are kept.
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Description

Technical Field

[0001] The utility model relates to the technical field of drying in the primary processing of natural rubber, in particular to a feeding system for an automatic drying system of natural rubber crepe sheets. Background Art

[0002] In the production process of natural rubber crepe sheets, after the solidified rubber blocks are creped and hung, most production workshops need to manually hang them one by one on the rack and then push the rack as a whole into the drying furnace for drying, or manually hang the hanging rod from the feed port of the drying furnace to the drying box for drying, which has low production efficiency and high labor intensity. A small number of production workshops are equipped with mechanical grippers and traditional hanging rod conveyor belts for transportation, but the cost of using mechanical grippers is too high, maintenance is inconvenient, and the equipment covers a large area but a small area, which is not conducive to the use of production workshops and is not suitable for all production workshops; the traditional hanging rod conveyor belt evolved from the conveyor belt of the noodle conveyor device, but the weight of the film is very different from that of the noodles, and the inertia is large when the hanging rod moves and the equipment is handed over. In addition, the film to be dried still has a certain humidity and a certain viscosity. Unstable transmission can easily cause the films to stick together, or the hanging rod directly falls out of the conveyor device. At this time, it is necessary to stop the machine and intervene manually to correct it, otherwise the production quality will be reduced. Therefore, this production method is in urgent need of automation upgrade and transformation.

[0003] Moreover, in the traditional production process of crepe sheets, wood burning and coal burning are usually used to heat the air to form hot air, and then the hot air is used to heat and dry the materials. According to current environmental protection requirements, the method of obtaining heat energy by combustion must be equipped with an environmental protection treatment device for combustion exhaust gas, resulting in high environmental protection treatment costs. At the same time, the use of combustion to obtain heat energy has problems such as the difficulty in accurately controlling the hot air temperature. The upgrading and transformation of green and environmentally friendly production in the production process of crepe sheets is imminent. A feeding system is required in the production line to complete the handover of materials between each link. Summary of the invention

[0004] In order to solve the problems of the prior art, the purpose of the utility model is to provide a feeding system for an automatic drying system for natural rubber crepe sheets. After the crepe sheet material is hung on the hanging rod, it is transported to the system by a chain. The transfer device in the system can automatically transfer the material. After being transferred into the drying box, the material can be dried in the drying box. The automation level of production and processing is greatly improved. At the same time, using electric energy as the energy source for drying can accurately control the temperature during the drying process. In addition, the hot air in the drying box can be recycled to recover the heat energy of the exhaust gas, which reduces energy consumption and solves the problem of environmental protection treatment of exhaust gas from combustion heating. The specific contents are as follows:

[0005] A feeding system for a natural rubber crepe sheet automatic drying system, characterized in that it comprises:

[0006] A drying box, comprising a feed door, a flange pipe a, a flange pipe b, a flange pipe c, a box conveying system, and a discharge door; the box conveying system is arranged on the top of the drying box, and the rubber material can move in the drying box through the box conveying system; and is used for drying the rubber material;

[0007] The feeding system is used to feed the materials into the drying box for drying;

[0008] The unloading system is used to transfer the films delivered by the box conveying system to the finished material conveying part, and finally to be manually packaged; the unloading system has the same basic structure as the loading system, the loading system has a higher conveying height than the box conveying system, and the box conveying system has a higher conveying height than the unloading system;

[0009] The feeding system includes a guide rail part, a support frame and a material rack; a plurality of the drying boxes are arranged in parallel in the automatic drying system, and the guide rail part is installed at the feeding doors of the plurality of drying boxes; the support frame can move on the guide rail part, and the material rack can move on the support frame, and the moving direction of the support frame and the moving direction of the material rack are perpendicular to each other in the horizontal plane; a conveying chain is installed inside the material rack, and the conveying direction of the conveying chain is consistent with the moving direction of the material rack on the support frame; a material rack conveying motor is arranged on the top of the material rack, and the conveying chain is driven to rotate by the material rack transmission chain; a conveying chain motor is arranged on the top of the material rack, and the conveying chain is driven to rotate by the conveying transmission chain.

[0010] Furthermore, it also includes a vacuum system and a heating system;

[0011] The flange pipe a is installed on the side of the drying box, and the flange pipe b and the flange pipe c are installed on the top of the drying box;

[0012] A vacuum system, connected to the flange pipe c on the drying box, capable of vacuuming the interior of the drying box;

[0013] The heating system includes an air inlet pipe and an air outlet pipe, which are respectively connected to the flange pipe a and the flange pipe b on the drying box body, and are used to dry the film after hot air is introduced into the drying box body.

[0014] Furthermore, the material rack also includes a transition block, which is fixedly mounted on the material rack and is used to allow the hanging rods transported on the conveying chain to be smoothly transferred; a slideway is provided on the transition block, the width of the slideway is the same as the diameter of the hanging rod, and the hanging rod can slide through the slideway along the slideway.

[0015] Furthermore, a bearing frame, a steel wheel, a driving shaft and a driving motor are provided at the bottom of the support frame, the driving shaft is installed on the bearing frame through a bearing, the steel wheels are installed at both ends of the driving shaft, and the support frame is installed on the guide rail part through the movable arrangement of the steel wheel. The driving motor can drive the driving shaft to rotate and then drive the steel wheel to rotate to allow the support frame to move laterally on the guide rail part; a rack is provided at the top of the support frame and is perpendicular to the guide rail part in the horizontal direction. The material rack is located on the upper part of the support frame, and a gear used in conjunction with the rack is provided at the bottom. A material rack movement is provided and installed on the material rack, and the material rack movement motor is driven by a sprocket to transmit to the gear to drive the material rack to move longitudinally on the support frame.

[0016] Furthermore, the drying box is also provided with a flange pipe d, and a plurality of the drying boxes are arranged in parallel in the automatic drying system, and all the drying boxes are interconnected through the flange pipe d.

[0017] Furthermore, a heat-insulating layer is provided on the outer wall of the drying box; positioning blocks are provided on the conveyor belts of the feeding system, the box conveying system and the unloading system, and a circular arc hole with the same diameter as the hanging rod is opened on the top of the positioning block; an evacuation valve is provided in the flange pipe c; and an air inlet valve and an air outlet valve are respectively provided in the flange pipe a and the flange pipe b.

[0018] Furthermore, a hanging rod recovery device is provided, which is installed at the end of the unloading system and is used to transport the hanging rods to the hanging film workshop.

[0019] Furthermore, the bottom and top of the drying box are respectively provided with uniform air layers, and the hot air entering the drying box through the flange pipe a rises evenly through the bottom uniform air layer, passes through the material, enters the flange pipe b through the top uniform air layer, and is output from the drying box.

[0020] The use mechanism includes the following steps, S1, material storage, the material after hanging film is transported to the drying box 1 through the loading device; when entering the warehouse, the support frame 22 carries the material frame 23 and moves on the guide rail part 21 to the incoming material conveying end to pick up the material, and after the conveying chain 231 is aligned with the incoming material conveying end, the material frame 23 is moved out through the material frame conveying motor 232 to complete the docking of the conveying chain 231, and then the film is transported to the conveying chain 231 on the material frame 23; then the material frame 23 is retracted; the support part is moved to the door of the drying box 1, and the material frame 23 is moved again. S2 extends the support frame 22, so that the conveying chain 231 is docked with the conveyor belt of the box conveying system 17 in the drying box 1, and the material is transferred to the inside of the drying box 1. After the material enters the drying box 1, the vacuum system 4 and the heating system 3 are used alternately to dry the material; S2.1, the drying when the material is heated The flange pipe a13 and the flange pipe b14 in the box body 1 are opened at the same time, and the heating system 3 supplies 80°C hot air to the drying box body 1 to heat the material, and the flange pipe c15 is closed and maintained for 6-10 minutes; S2.2, after the hot air supply time is reached, the flange pipe a13 and the flange pipe b14 are closed at the same time and maintained for 3-7 minutes; S2.3, then open the flange pipe c15, start the vacuum system 4, so that the negative pressure absolute pressure in the drying box body 1 is less than 30000Pa, and maintain for 1-3 minutes; then repeat S1 to S3, when the moisture content of the material is less than 1%, the time in step S1 is shortened to 1-3 minutes, and the time in step S3 is increased to 6-10 minutes; S3 is shipped out, and the dried material is transported to the finished material conveying part 6 through the unloading system 5. The principle of the unloading system 5 is the same as that of the upper system; finally, it is manually packaged. The setting of the transition block 24 allows the hanging rod on the conveying chain 231 to move smoothly along the stroke on the transition block 24 to the box conveying system 17 in the drying box 1, and accurately fall into the arc hole opened on the positioning block 19 on the conveying, so as to prevent the material hanging rod from being misaligned when the handover occurs. The cooperation between the transition block 24 and the positioning block 19 also facilitates the purpose of accurately controlling the distance between materials by controlling the rotation of the motors of each part.

[0021] The utility model has the following beneficial effects compared with the prior art:

[0022] The automatic drying system for natural rubber crepe sheets provided by the utility model can realize the automation of material loading, unloading, transfer and delivery, hot air supply and drying process control, which greatly improves the work efficiency of manual loading, unloading and delivery in the current industry; the double-layer structure of the support frame and the material frame arranged in the loading system is convenient for docking with each drying box body, and the setting of the transition block can ensure that the material hanging rod will not be misplaced or even fall off during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system described in the utility model;

[0024] Figure 2 This is a schematic diagram of the main cross-section of the drying box of the utility model;

[0025] Figure 3 It is a left side cross-sectional schematic diagram of the drying box body of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the feeding system of the utility model;

[0027] Figure 5 This is the front view of the feeding system of the utility model;

[0028] Figure 6 This is a left view of the feeding system of the utility model;

[0029] Figure 7 This is a schematic diagram of the feeding system in use according to the utility model;

[0030] Figure 8 This is a schematic diagram of the feeding system in use according to the utility model;

[0031] Fig. 9 This is a three-dimensional schematic diagram of the transition block in the utility model in use;

[0032] Fig.10 This is a schematic diagram of the use status of the transition block of the utility model.

[0033] In the figure:

[0034] 1—drying box, 11—feeding door, 12—discharging door, 13—flange pipe a, 14—flange pipe b, 15—flange pipe c, 16—flange pipe d, 17—box conveying system, 18—air distribution layer, 19—positioning block;

[0035] 2 - feeding system, 21 - guide rail, 22 - support frame, 221 - bearing frame, 222 - steel wheel,

[0036] 223—driving shaft, 224—driving motor, 225—rack; 23—material rack, 231—conveying chain, 232—material rack conveying motor, 233—material rack transmission chain, 234—gear, 235—conveying transmission chain, 236—conveying chain motor; 24—transition block, 241—slideway;

[0037] 3—heating system, 31—air inlet pipe, 32—air outlet pipe;

[0038] 4—Vacuum extraction system; 5—Unloading system; 6—Finished product material conveying section; 7—Hanging rod recovery device. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features and purposes of the present invention easy to understand, the technical solution of the invention is further explained below in combination with one embodiment and specific implementation method of a feeding system for an automatic drying system for natural rubber crepe sheets provided by the present invention.

[0040] like Figure 1-9 As shown, the specific embodiments given for the invention are as follows:

[0041] A feeding system for an automatic drying system for natural rubber crepe sheets, comprising:

[0042] A feeding system 2 is used to feed the material into the drying box 1 for drying;

[0043] The drying box 1 includes a feed door 11, a flange pipe a13, a flange pipe b14, a flange pipe c15, a box conveying system 17, and a discharge door 12; the box conveying system 17 is arranged on the top of the drying box 1, and the rubber material can move in the drying box 1 through the box conveying system 17; the flange pipe a13 is arranged on the side of the drying box 1, and the flange pipe b14 and the flange pipe c15 are arranged on the top of the drying box 1; the drying box 1 is also provided with a flange pipe d16, and a plurality of drying boxes 1 are arranged in parallel in the automatic drying system, and all the drying boxes 1 are interconnected through the flange pipe d16.

[0044] The vacuum system 4 is connected to the flange pipe c15 on the drying box 1, and can evacuate the interior of the drying box 1;

[0045] The heating system 3 includes an air inlet pipe 31 and an air outlet pipe 32, which are respectively connected to the flange pipe a13 and the flange pipe b14 on the drying box 1, and are used to dry the film after hot air is introduced into the drying box 1;

[0046] The unloading system 5 is used to transfer the film conveyed by the box conveying system 17 to the finished material conveying part 6, and finally to be manually packaged; the unloading system 5 has the same basic structure as the loading system 2, the conveying height of the loading system 2 is higher than the conveying height of the box conveying system 17, and the conveying height of the box conveying system 17 is higher than the conveying height of the unloading system 5.

[0047] The feeding system 2 includes a guide rail portion 21, a support frame 22 and a material rack 23; a plurality of drying boxes 1 are arranged in parallel in the automatic drying system, and the guide rail portion 21 is arranged and installed on the feeding doors 11 of the plurality of drying boxes 1; the support frame 22 can move on the guide rail portion 21, and the material rack 23 can move on the support frame 22, and the moving direction of the support frame 22 and the moving direction of the material rack 23 are perpendicular to each other in the horizontal plane; a conveying chain 231 is arranged and installed inside the material rack 23, and the conveying direction of the conveying chain 231 is consistent with the moving direction of the material rack 23 on the support frame 22; a material rack conveying motor 232 is arranged on the top of the material rack 23, and the conveying chain 231 is driven to rotate through the material rack transmission chain 233. The material rack 23 also includes a transition block 24, which is fixedly mounted on the material rack 23 and is used to allow the hanging rods transported on the conveying chain 231 to be smoothly transferred; a slideway 241 is provided on the transition block 24, and the width of the slideway 241 is the same as the diameter of the hanging rod, and the hanging rod can slide through the slideway 241 along the slideway 241. A bearing frame 221, a steel wheel 222, a driving shaft 223 and a driving motor 224 are provided at the bottom of the support frame 22. The driving shaft 223 is installed on the bearing frame 221 through a bearing, and the steel wheel 222 is installed at both ends of the driving shaft 223. The support frame 22 is movably installed on the guide rail portion 21 through the steel wheel 222. The driving motor 224 can drive the driving shaft 223 to rotate and then drive the steel wheel 222 to rotate to allow the support frame 22 to move horizontally on the guide rail portion 21; a rack 225 that is perpendicular to the guide rail portion 21 in the horizontal direction is provided on the top of the support frame 22, and the material rack 23 is located at the upper part of the support frame 22. A gear 234 used in conjunction with the rack 225 is provided at the bottom. The material rack 23 is provided with a material rack 23 mobile, and the material rack 23 moving motor is transmitted to the gear 234 through the driving sprocket to drive the material rack 23 to move longitudinally on the support frame 22. A conveyor chain motor 236 is provided on the top of the material rack, which drives the conveyor chain 231 to rotate through the conveyor transmission chain 235.

[0048] The outer wall of the drying box 1 is provided with a heat-insulating layer; the conveyor belts of the feeding system 2, the box conveying system 17 and the unloading system 5 are all provided with positioning blocks 19, and a circular arc hole with the same diameter as the hanging rod is opened on the top of the positioning block 19; an evacuation valve is provided in the flange pipe c15; the flange pipe a13 and the flange pipe b14 are respectively provided with an air inlet valve and an air outlet valve. The bottom and top of the drying box 1 are respectively provided with an air-distributing layer 18, and the hot air entering the drying box 1 through the flange pipe a13 rises evenly through the bottom air-distributing layer 18, passes through the material, enters the flange pipe b14 through the top air-distributing layer 18, and is output from the drying box 1. A hanging rod recovery device 7 is also provided, which is installed at the end of the unloading system 5 and is used to transport the hanging rods to the hanging film workshop.

[0049] A drying method for a feeding system used in an automatic drying system for natural rubber crepe sheets, comprising the following steps: S1, materials are put into storage, and the materials after hanging are transported into a drying box 1 through a feeding device; when put into storage, a support frame 22 carries a material frame 23 and moves on a guide rail 21 to an incoming material conveying end to pick up materials, and after a conveying chain 231 is aligned with the incoming material conveying end, the material frame 23 is moved out through a material frame conveying motor 232 to complete the docking of the conveying chain 231, and then all the films are transported to the conveying chain 231 on the material frame 23; then the material frame 23 is retracted; the support part is moved to the door of the drying box 1, and the material frame 23 is moved again S2 to extend the support frame 22, so that the conveying chain 231 is docked with the conveying belt of the box conveying system 17 in the drying box 1, and the materials are transferred to the inside of the drying box 1. After the materials enter the drying box 1, the materials are dried by alternately cooperating with a vacuum system 4 and a heating system 3; S2.1. When the material is heated, the flange pipe a13 and the flange pipe b14 in the drying box 1 are opened at the same time, and the heating system 3 supplies 80°C hot air to the drying box 1 to heat the material. The flange pipe c15 is closed and maintained for 6-10 minutes. S2.2. After the hot air supply time is reached, the flange pipe a13 and the flange pipe b14 are closed at the same time and maintained for 3-7 minutes. S2.3. Then open the flange pipe c15 and start the vacuum system 4 to make the negative absolute pressure in the drying box 1 less than 30000Pa and maintain it for 1-3 minutes. Then repeat S1 to S3. When the moisture content of the material is less than 1%, the time in step S1 is shortened to 1-3 minutes, and the time in step S3 is increased to 6-10 minutes. S3 is shipped out of the warehouse, and the dried material is transported to the finished material conveying part 6 through the unloading system 5. The principle of the unloading system 5 is the same as that of the upper system. Finally, it is manually packaged. The setting of the transition block 24 allows the hanging rod on the conveying chain 231 to move smoothly along the stroke on the transition block 24 to the box conveying system 17 in the drying box 1, and accurately fall into the arc hole opened on the positioning block 19 on the conveying, so as to prevent the material hanging rod from being misaligned when the handover occurs. The cooperation between the transition block 24 and the positioning block 19 also facilitates the purpose of accurately controlling the distance between materials by controlling the rotation of the motors of each part.

[0050] It should be understood that the above specific embodiments are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. The claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A feeding system for an automatic drying system for natural rubber crepe sheets, characterized in that: include: A drying box (1) comprises a feed door (11), a flange pipe a (13), a flange pipe b (14), a flange pipe c (15), a box conveying system (17), and a discharge door (12); the box conveying system (17) is arranged and installed on the top of the drying box (1), and the rubber material can be moved in the drying box (1) through the box conveying system (17); and is used for drying the rubber material; A feeding system (2) is used to feed the incoming materials into the drying box (1) for drying; The unloading system (5) is used to transfer the film delivered by the box conveying system (17) to the finished material conveying section (6), and finally to be manually packaged; the unloading system (5) has the same basic structure as the loading system (2), the loading system (2) has a higher conveying height than the box conveying system (17), and the box conveying system (17) has a higher conveying height than the unloading system (5); The feeding system (2) comprises a guide rail portion (21), a support frame (22) and a material rack (23); a plurality of the drying boxes (1) are arranged in parallel in the automatic drying system, and the guide rail portion (21) is arranged and installed on the feed doors (11) of the plurality of drying boxes (1); the support frame (22) can move on the guide rail portion (21), and the material rack (23) can move on the support frame (22), and the moving direction of the support frame (22) and the moving direction of the material rack (23) are perpendicular to each other on a horizontal plane; A conveying chain (231) is installed inside the material rack (23), and the conveying direction of the conveying chain (231) is consistent with the moving direction of the material rack (23) on the support frame (22); a material rack conveying motor (232) is arranged on the top of the material rack (23), and the conveying chain (231) is driven to rotate through the material rack transmission chain (233); and a conveying chain motor (236) is arranged on the top of the material rack (23), and the conveying chain (231) is driven to rotate through a conveying transmission chain (235).

2. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: It also includes a vacuum system (4) and a heating system (3); The flange pipe a (13) is arranged and installed on the side of the drying box (1), and the flange pipe b (14) and the flange pipe c (15) are arranged and installed on the top of the drying box (1); A vacuum system (4) connected to the flange pipe c (15) on the drying box (1) and capable of vacuuming the interior of the drying box (1); The heating system (3) comprises an air inlet pipe (31) and an air outlet pipe (32), which are respectively connected to the flange pipe a (13) and the flange pipe b (14) on the drying box (1), and are used to dry the film after hot air is introduced into the drying box (1).

3. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: The material rack (23) further comprises a transition block (24), wherein the transition block (24) is fixedly mounted on the material rack (23) and is used to allow the hanging rods transported on the conveying chain (231) to be smoothly transferred; a slideway (241) is provided on the transition block (24), wherein the width of the slideway (241) is the same as the diameter of the hanging rod, and the hanging rod can slide through the slideway (241) along the slideway (241).

4. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: A bearing frame (221), a steel wheel (222), a driving shaft (223) and a driving motor (224) are arranged at the bottom of the support frame (22); the driving shaft (223) is mounted on the bearing frame (221) via a bearing; the steel wheel (222) is mounted at both ends of the driving shaft (223); the support frame (22) is movably mounted on the guide rail portion (21) via the steel wheel (222); the driving motor (224) can drive the driving shaft (223) to rotate and thereby drive the steel wheel (222) to rotate so that the support frame (22) moves horizontally on the guide rail portion (21); a rack (225) is arranged at the top of the support frame (22) and is perpendicular to the guide rail portion (21) in the horizontal direction; the material rack (23) is located at the upper part of the support frame (22), and a gear (234) is arranged at the bottom for use with the rack (225); a material rack (23) moving motor is arranged on the material rack (23), and the material rack (23) moving motor can drive the material rack (23) to move longitudinally on the support frame (22) by driving a sprocket to the gear (234).

5. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: The drying box (1) is also provided with a flange pipe d (16). A plurality of the drying boxes (1) are arranged in parallel in the automatic drying system, and all the drying boxes (1) are interconnected via the flange pipe d (16).

6. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: The outer wall of the drying box (1) is provided with a heat-insulating layer; the conveyor belts of the feeding system (2), the box conveying system (17) and the unloading system (5) are all provided with positioning blocks (19), and the top of the positioning blocks (19) is provided with a circular arc hole having the same diameter as the hanging rod; the flange pipe c (15) is provided with an evacuation valve; and the flange pipe a (13) and the flange pipe b (14) are respectively provided with an air inlet valve and an air outlet valve.

7. A feeding system for an automatic drying system for natural rubber crepe sheets as claimed in claim 1, characterized in that: A hanging rod recovery device (7) is also provided. The hanging rod recovery device (7) is installed at the end of the unloading system (5) and is used to transport the hanging rods to the hanging film workshop.