A rubber preheating device

Abstract

The application belongs to the technical field of rubber preparation preheating, and discloses a rubber preheating device, which comprises a base, the side of the base is provided with a collecting box, the body of the base is fixedly connected with a machine cover plate, the top side plate body of the machine cover plate is fixedly connected with a quantitative feeding hopper, and the inner wall of the quantitative feeding hopper is stacked with a plurality of rubber sheets; the rubber sheets are independently inclined and placed by the cooperation of a plurality of roller wheels and U-shaped rod frames to make the belt form a V-shaped structure, the cooperation of a metal V-shaped arc guide plate limiting support, and gravity, the cooperation of an electric telescopic rod, a hollow sleeve plate, a spring, an inclined arc groove and a limiting clamping plate to form an elastic pushing and turning mechanism, the inclined rubber sheets are flexibly pushed to rotate and turn over at a fulcrum, the spring has buffering and resetting capabilities, the pushing force is soft, the rubber sheets are prevented from being extruded and damaged, the opposite sides of the material are alternately heated, and the problems of uneven heating and local low temperature in single-side preheating are completely solved.

Description

Technical Field

[0001] This invention belongs to the field of rubber preparation and preheating technology, specifically a rubber preheating device. Background Technology

[0002] There are various types of rubber on the market, including raw rubber and compound rubber. Raw rubber refers to the original rubber raw material that has not been vulcanized and has not added a large number of compounding agents. It is the basic matrix material for manufacturing all rubber products. It is mainly divided into two categories: natural raw rubber and synthetic raw rubber. Natural raw rubber is made by directly extracting latex from rubber plants (mainly rubber trees). Synthetic raw rubber is a highly elastic polymer made through chemical synthesis. It is divided into general synthetic rubber and special synthetic rubber. Chess pieces made by wrapping wood with raw rubber combine the toughness of wood and the characteristics of natural rubber, and can be waterproof, moisture-proof and rot-proof. Unlike compounded rubber, raw rubber cannot be directly processed into a tough solid on a rolling mill. In winter, as the temperature drops, rubber tends to crystallize and harden at low temperatures. Therefore, it needs to be preheated before hot refining to facilitate subsequent cutting, breaking, and plasticizing, and to prevent excessive equipment load caused by low-temperature crystallization. In current technology, rubber blocks are the most basic raw material form for rubber processing. The common practice is to transfer sheet or block-shaped low-temperature rubber materials to a workshop with a constant temperature of above 10 degrees Celsius 24-48 hours in advance for natural rewarming. However, this rewarming is not only slow, but also causes uneven temperature differences between the inside and outside of the stacked rubber materials, resulting in uneven rewarming. Adding a circulation system to the rewarming room has the same effect, as it will cause uneven rewarming due to different stacking positions. Summary of the Invention

[0003] To address the problems mentioned in the background section, the present invention provides a rubber preheating device.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a rubber preheating device, comprising a base, a collection box provided on the side of the base, a cover plate fixedly connected to the body of the base, a quantitative feeding hopper fixedly connected to the top side plate of the cover plate, a plurality of rubber sheets piled in the inner wall of the quantitative feeding hopper, and a conveying device installed on the cover plate, the conveying device consisting of a motor, a plurality of rollers and a rubber belt rotatably connected to the outer wall of each roller, wherein the rubber sheets are fed one by one into the conveying device at regular intervals and in a quantitative manner through the quantitative feeding hopper, so that each rubber sheet can be in close contact with the rotating belt; Three rollers are slidably connected to the belt, and each of the three rollers is movably fitted with a U-shaped rod. The length of the U-shaped rods on both sides is much longer than that of the U-shaped rod in the middle position. Thus, the three U-shaped rods, together with the three rollers, can cause a part of the belt to form a V-shape, which is beneficial for the subsequent tilting of the rubber sheet. A preheating structure is provided between the quantitative feeding hopper and the belt. A pushing structure is provided at the V-shaped position of the belt to turn the tilted rubber sheet over.

[0005] Preferably, all three rollers are made of metal, and the bottom ends of the three U-shaped rods are fixedly connected to the machine base. The belt has a V-shaped guide plate made of metal attached to it. Each rubber sheet can intermittently attach to the V-shaped guide plate. Positioning blocks are fixedly connected to the outer walls of both ends of the V-shaped guide plate, and the two positioning blocks are fixedly connected to the two side rods of the U-shaped rod located in the middle.

[0006] Preferably, the air preheating structure includes an air pump fixedly connected to the outer wall of the top of the cover plate, and an air extraction pipe and an air delivery pipe are fixedly connected to both ends of the air pump, respectively. An air bucket is fixedly connected to one end of the air extraction pipe away from the air pump. The air bucket is fixedly connected to one side plate of the metering hopper. A filter screen is tightly clamped into the inner wall of the air bucket.

[0007] Preferably, an arc-shaped groove plate is fixedly connected to the outer wall of one side plate of the quantitative feeding hopper, a plurality of heating tubes are fixedly connected to the inner wall of the top of the arc-shaped groove plate, a plurality of air outlets are opened on the bottom plate of the arc-shaped groove plate, and three infrared radiation plates are fixedly connected to the outer wall of the bottom plate of the arc-shaped groove plate. The end of the air supply pipe away from the air pump is fixedly connected to the top plate of the arc-shaped groove plate.

[0008] Preferably, the pushing structure includes an L-shaped support plate fixedly connected to the base, an electric telescopic rod fixedly connected to the outer wall of the end of the L-shaped support plate facing the cover plate, and a hollow sleeve plate fixedly connected to the movable end of the electric telescopic rod.

[0009] Preferably, one end of the hollow sleeve plate and the cover plate are slidably connected, and an extension plate is slidably connected to the inner wall of the hollow sleeve plate, and the extension plate and the rubber sheet are intermittently bonded together.

[0010] Preferably, two springs are fixedly connected between the inner wall of the slot of the hollow sleeve plate and one end plate of the extension plate, and an oblique arc groove is formed on the top plate of the end of the hollow sleeve plate away from the electric telescopic rod.

[0011] Preferably, a T-shaped rod is fixedly connected to the outer wall of the top plate of the extension plate, and the surface of the T-shaped rod near the bottom end is in close contact with the groove wall of the inclined arc groove.

[0012] Preferably, an L-shaped clamping plate can be intermittently attached to the outer wall of the T-shaped rod near its top, and the bottom plate of the L-shaped clamping plate is fixedly connected to the base.

[0013] Preferably, four casters are fixedly connected to the outer wall of the bottom of the collection box for quickly and uniformly transferring the preheated rubber sheets. A shaft is fixedly connected to the base directly above the collection box. A metal partition is rotatably connected to the shaft. Torsion springs are fixedly connected between the outer walls of the two ends of the partition and the inner wall of the base. The rubber sheet and the partition can be intermittently fitted together.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a quantitative feeding hopper to achieve single-sheet, timed, and quantitative orderly feeding of rubber sheets. Combined with a conveyor system for uniform conveying, it ensures independent transport of each rubber sheet without stacking, providing a foundation for uniform preheating and preventing uneven heating due to material clumping. A preheating air structure is incorporated, where a vacuum pump draws in filtered air, and heating elements generate hot air that is evenly blown out from the air outlet to provide a surrounding hot air preheating effect on the rubber sheets. An internal filter screen within the air hopper filters out dust and impurities from the air, preventing contaminants from adhering to the rubber sheet surface and affecting quality. Simultaneously, an infrared radiation plate emits far-infrared rays, utilizing the principle of rubber molecule resonance to achieve deep heating, with simultaneous heating of the surface and interior. This results in high preheating efficiency, small temperature difference, and effectively improved preheating quality of the rubber sheets. This invention utilizes multiple sets of rollers and a U-shaped frame to form a V-shaped belt structure, coupled with a metal V-shaped guide plate for limiting support. Gravity allows the rubber sheet to tilt autonomously. An electric telescopic rod, hollow sleeve, spring, inclined arc groove, and limiting plate work together to form an elastic pushing and flipping mechanism. This mechanism flexibly pushes the tilted rubber sheet to rotate and flip it around a fulcrum. The spring has buffering and restoring capabilities, providing gentle pushing force to prevent the rubber sheet from being crushed or damaged. This allows for alternating heating of the material's front and back sides, completely solving the problems of uneven heating and localized low temperatures caused by single-sided preheating.

[0015] This invention, by setting a baffle, can keep the discharge port of the machine base sealed when the rubber sheet is not being fed, reducing the entry of dust and the loss of heat. Moreover, the material is only fed after a certain amount of rubber sheet has been accumulated, reducing the open time of the discharge port. This helps to reduce the heat loss of the entire preheating device, ensures that the internal temperature of the preheating device is relatively constant, and improves the preheating effect and speed. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the filter structure of the present invention; Figure 3 This is a schematic diagram of a partial cross-sectional structure of the cover plate of the present invention; Figure 4 This is a schematic diagram of the rubber sheet structure of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This is a partial cross-sectional view of the arc-shaped groove plate of the present invention. Figure 7 This is a schematic diagram of the air outlet structure of the present invention; Figure 8 This is a partial cross-sectional view and structural schematic diagram of the hollow sleeve plate in this invention; Figure 9 This is a partial cross-sectional view of the base of the present invention, as well as a partially enlarged structural diagram of the shaft and torsion spring.

[0017] In the picture: 1. Base; 101. Collection box; 2. Machine cover plate; 201. Quantitative feeding hopper; 202. Rubber sheet; 203. Conveying equipment; 204. Roller; 205. U-shaped rod frame; 206. V-shaped guide plate; 207. Positioning block; 208. Air pump; 209. Air extraction pipe; 210. Air delivery pipe; 211. Air bucket; 212. Filter screen; 213. Arc-shaped groove plate; 214. Heating tube; 215. Air outlet; 216. Infrared radiation plate; 217. L-shaped support plate; 218. Electric telescopic rod; 219. Hollow sleeve plate; 220. Extension plate; 221. Spring; 222. Inclined arc groove; 223. T-shaped rod; 224. L-shaped clamping plate; 225. Shaft; 226. Partition plate; 227. Torsion spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1 to 9As shown, the present invention provides a rubber preheating device, including a base 1, a collection box 101 is provided on the side of the base 1, a cover plate 2 is fixedly connected to the body of the base 1, a quantitative feeding hopper 201 is fixedly connected to the top side plate of the cover plate 2, a plurality of rubber sheets 202 are piled in the inner wall of the quantitative feeding hopper 201, and a conveying device 203 is installed on the cover plate 2. The conveying device 203 is composed of a motor, a plurality of rollers and a rubber belt that is rotatably connected to the outer wall of each roller. The rubber sheets 202 are fed one by one into the conveying device 203 in a timed and quantitative manner through the quantitative feeding hopper 201, so that each rubber sheet 202 can be in close contact with the belt in the rotating state. Three rollers 204 are slidably connected to the belt, and each roller 204 is movably fitted with a U-shaped rod 205. This means the three rollers 204 can rotate on the U-shaped rods 205. The length of the rods on the two outer U-shaped rods 205 is much greater than that of the middle U-shaped rod 205. Therefore, the three U-shaped rods 205, in conjunction with the three rollers 204, can cause a portion of the belt to form a V-shape, which facilitates the subsequent tilting of the rubber sheet 202. All wheels 204 are made of metal, and the bottom rods of the three U-shaped rods 205 are fixedly connected to the base 1. The belt has a V-shaped guide plate 206 made of metal attached to it. Each rubber sheet 202 can intermittently contact the V-shaped guide plate 206. Positioning blocks 207 are fixedly connected to the outer walls of both ends of the V-shaped guide plate 206, and the two positioning blocks 207 are fixedly connected to the rods on both sides of the U-shaped rod 205 located in the middle.

[0020] The above solution is adopted: such as Figures 2 to 5 As shown, the existing quantitative feeding hopper 201 feeds the stacked rubber sheets 202 on the inner wall one by one in a timed manner, and puts them onto the conveyor 203 running inside the machine cover plate 2. The rubber sheets 202 are conveyed by a passive belt in the conveyor 203 until they move to a point where the belt is partially pressed into a V-shape by three rollers 204 and a U-shaped frame 205. At this point, the rubber sheets 202 will continue to be conveyed by the belt and move horizontally, gradually reducing the contact area between the rubber sheets 202 and the belt. As a result, the area of ​​the rubber sheets 202 detached from the belt is reduced. If the contact area between the rubber sheet 202 and the belt is greater than the contact area between the rubber sheet 202 and the belt, the rubber sheet 202 will naturally tilt due to gravity, causing one end to fall towards the V-shaped guide plate 206. The two V-shaped guide plates 206 installed on the middle U-shaped frame 205 can provide fixed-point support for the V-shaped guide plate 206, so that it is in contact with the belt but does not exert any resistance on the belt. The belt itself will not affect the fixed point of the V-shaped guide plate 206 due to the smooth rotation mode. After the rubber sheet 202 tilts passively, the conveyor 203 will stop operating.

[0021] A preheating structure is provided between the quantitative feeding hopper 201 and the conveyor belt. This preheating structure includes an air pump 208 fixedly connected to the outer wall of the top of the machine cover plate 2. An air extraction pipe 209 and an air delivery pipe 210 are fixedly connected to both ends of the air pump 208, respectively. An air bucket 211 is fixedly connected to the end of the air extraction pipe 209 away from the air pump 208. The air bucket 211 is fixedly connected to one side plate of the quantitative feeding hopper 201. A filter is tightly fitted into the inner wall of the air bucket 211. Net 212, an arc-shaped groove plate 213 is fixedly connected to the outer wall of one side of the quantitative feeding hopper 201. Multiple heating tubes 214 are fixedly connected to the inner wall of the top of the arc-shaped groove plate 213, and multiple air outlets 215 are opened on the bottom plate of the arc-shaped groove plate 213. Three infrared radiation plates 216 are fixedly connected to the outer wall of the bottom plate of the arc-shaped groove plate 213. The end of the air supply pipe 210 away from the air pump 208 is fixedly connected to the top plate of the arc-shaped groove plate 213.

[0022] The above solution is adopted: such as Figures 3 to 7 As shown, when the rubber sheet 202 is moved horizontally by the belt and enters the area of ​​the arc-shaped groove plate 213, the pre-started suction pump 208 will draw gas through the suction pipe 209 and the air hopper 211 to collect the gas uniformly through the metering hopper 201. When the continuous gas is drawn into the suction pipe 209, it will first pass through the filter screen 212 to filter it, preventing dust and other fine impurities in the air from entering. When the suction pump 208 is running, it will draw air into the pump. There are gaps in the impeller blades in the pump, and the air will temporarily exist in the gaps. Because there is water in the pump body, the air will be sealed. Then, the eccentric impeller in the pump body will rotate, the gaps will become smaller, and the air will be discharged. This cycle continues. The operating principle of the suction pump 208 is existing technology and will not be described in detail here. As mentioned above, the filtered and discharged gas will enter the arc-shaped groove plate 213 through the air delivery pipe 210, and then pass through the arc... Multiple air vents 215 on the bottom of the arc-shaped groove plate 213 allow natural exhaust. The gas entering the arc-shaped groove plate 213 is immediately heated by multiple heating tubes 214 installed on the inner wall of the top of the arc-shaped groove plate 213. The heated gas is then converted into hot gas and naturally discharged from the multiple air vents 215 to achieve hot air preheating, raising the spatial temperature of the rubber sheet 202 during its movement. Before and after the rubber sheet 202 is tilted and comes into contact with the V-shaped guide plate 206, once it enters the range of the infrared radiation plate 216, the rubber sheet 202 will be infrared preheated. Specifically, the infrared radiation plate 216 emits far-infrared rays in the 3–15μm band, which are highly matched with the vibration frequency of rubber molecules, achieving molecular-level resonance heating. This significantly improves heating efficiency and temperature uniformity, laying a good foundation for the subsequent vulcanization process. Thus, a double-layer preheating effect is achieved through the flow of hot gas and infrared radiation.

[0023] A pushing structure is provided at the V-shaped position of the belt to flip the inclined rubber sheet 202. The pushing structure includes an L-shaped support plate 217 fixedly connected to the base 1. An electric telescopic rod 218 is fixedly connected to the outer wall of the end of the L-shaped support plate 217 facing the machine cover plate 2. A hollow sleeve plate 219 is fixedly connected to the movable end of the electric telescopic rod 218. One end of the hollow sleeve plate 219 is inserted into the machine cover plate 2. The plate body of the hollow sleeve plate 219 and one end of the plate body of the machine cover plate 2 are slidably connected. An extension plate 220 is slidably connected to the inner wall of the hollow sleeve plate 219. The extension plate 220 and the rubber sheet 202 are intermittently connected. The inner wall of the groove of the hollow sleeve plate 219 is... Two springs 221 are fixedly connected to one end of the extension plate 220. A slanted arc groove 222 is opened on the top plate of the hollow sleeve plate 219 away from the electric telescopic rod 218. A T-shaped rod 223 is fixedly connected to the outer wall of the top plate of the extension plate 220. The surface of the rod near the bottom of the T-shaped rod 223 is in contact with the groove wall of the slanted arc groove 222. An L-shaped card plate 224 can be intermittently connected to the outer wall of the rod near the top of the T-shaped rod 223. The bottom plate of the L-shaped card plate 224 is fixedly connected to the base 1. Four universal wheels are fixedly connected to the outer wall of the bottom of the collection box 101 for the unified and rapid transfer of the collected preheated rubber sheet 202. A shaft 225 is fixedly connected to the base 1 directly above the collection box 101. A metal partition 226 is rotatably connected to the shaft 225. Torsion springs 227 are fixedly connected between the outer walls of the two ends of the partition 226 and the inner wall of the base 1. The rubber sheet 202 and the partition 226 can be intermittently fitted together.

[0024] The above solution is adopted: such as Figure 3 and Figure 6 , 8As shown in Figure 9, the rubber sheet 202, inclined on the belt and V-shaped guide plate 206, is preheated for a specific time. The system programming program automatically activates the electric telescopic rod 218 installed on the L-shaped support plate 217, causing the movable end of the electric telescopic rod 218 to extend and drive the hollow sleeve plate 219 closer to the inclined rubber sheet 202. During the passive translation of the hollow sleeve plate 219, once the T-shaped rod 223 contacts the L-shaped clamping plate 224, the L-shaped clamping plate 224 provides a blocking force for the T-shaped rod 223. Under the continuous pressure and movement force applied by the electric telescopic rod 218, the hollow sleeve plate 219 causes the T-shaped rod 223 to slide within the inclined arc groove 222 opened on the hollow sleeve plate 219, achieving continuous force-driven translation of the hollow sleeve plate 219. During the transfer process, the two springs 221, which are fixed together with the extension plate 220, are stretched. The presence of the springs 221 provides an automatic elastic reset condition for the extension plate 220. As a result, the T-shaped rod 223 will be subjected to force and will translate in the inclined arc groove 222 along the groove diameter direction. The T-shaped rod 223 will also move horizontally on the L-shaped clamping plate 224. The force on the T-shaped rod 223 will cause the extension plate 220 to translate closer to the rubber sheet 202, so that the extension plate 220 removed from the hollow sleeve plate 219 will exert a pushing force on the inclined rubber sheet 202. The rubber sheet 202 will be passively subjected to force and tilted around the end that contacts the V-shaped guide plate 206 as the fulcrum, thereby achieving the effect of flipping. The side of the rubber sheet 202 that was originally facing upwards will contact the conveying equipment after flipping. In section 203, the passive belt continuously conveys the rubber sheet, which is also preheated by both hot air and infrared radiation, resulting in faster, more even, and comprehensive heating. The conveyor 203 then operates under system control, with the belt rotating smoothly in a uniform direction. This causes the flipped rubber sheet 202 to move synchronously, disengaging from the V-shaped section of the belt and contacting the V-shaped guide plate 206. The preheated rubber sheet 202, conveyed by the belt, naturally falls onto the surface of the partition 226 until multiple preheated rubber sheets 202 are piled up on the partition 226. When the weight of these multiple rubber sheets reaches the point where the two torsion springs 227 cannot bear the load, the partition 226 tilts and rotates around the shaft 225, tilting downwards under stress. Multiple rubber sheets 202 can then be fed at once and placed directly in the collection box 101. The coefficient of friction between the partition 226 and the rubber sheets 202 is extremely low. Furthermore, the two torsion springs 227 on the partition 226 will automatically drive the partition 226 to elastically reset before the next rubber sheet 202 is removed from the belt after preheating. This allows for unified collection of the same batch, facilitating subsequent collective transfer. In addition, the partition 226 can keep the discharge port of the machine base 1 blocked when the rubber sheets 202 are not being fed, reducing dust entry and heat loss. Feeding will only be carried out after a certain amount of rubber sheets 202 have accumulated, which helps to reduce heat loss of the entire preheating device, ensures a relatively constant internal temperature of the preheating device, and improves the preheating effect and speed.

[0025] It is worth noting that the quantitative feeding hopper 201 also adopts existing technology that can quantitatively and timedly feed materials. The quantitative feeding hopper 20 is equipped with multiple baffles to separate the rubber sheet 202 and the filter screen 212, dividing them into two areas. The operation of the conveying device 203 also stops immediately after the rubber sheet 202 is passively conveyed and tilts. After the rubber sheet 202 is preheated evenly on both sides, each side has a specific preheating time required before the conveying device 203 will run again. The same operation is performed during the preheating process of each rubber sheet 202.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rubber preheating device, comprising a base (1), characterized in that: A collection box (101) is provided on the side of the machine base (1). A machine cover plate (2) is fixedly connected to the machine body of the machine base (1). A quantitative feeding hopper (201) is fixedly connected to the top side plate of the machine cover plate (2). Several rubber sheets (202) are piled in the inner wall of the quantitative feeding hopper (201). A conveying device (203) is installed on the machine cover plate (2). The conveying device (203) is composed of a motor, multiple rollers and a rubber belt that is rotatably connected to the outer wall of each roller. The rubber sheets (202) are fed one by one into the conveying device (203) in a timed and quantitative manner through the quantitative feeding hopper (201), so that each rubber sheet (202) can be in contact with the belt in the rotating state. Three rollers (204) are slidably connected to the belt, and each of the three rollers (204) is movably sleeved with a U-shaped rod (205). The length of the rods of the two U-shaped rods (205) on both sides is much longer than that of the U-shaped rod (205) in the middle position. Thus, the three U-shaped rods (205) cooperate with the three rollers (204) to make the belt part of the belt form a V shape, which is beneficial to make the rubber sheet (202) tilted in the future. A preheating structure is provided between the quantitative feeding hopper (201) and the belt. A pushing structure is provided at the position where the belt forms a V shape, which is used to turn the tilted rubber sheet (202) over.

2. The rubber preheating device according to claim 1, characterized in that: All three rollers (204) are made of metal, and the bottom rods of the three U-shaped rods (205) are fixedly connected to the machine base (1). The belt has a V-shaped guide plate (206) made of metal attached to it. Each rubber sheet (202) can be attached to the V-shaped guide plate (206) intermittently. Positioning blocks (207) are fixedly connected to the outer walls of both ends of the V-shaped guide plate (206), and the two positioning blocks (207) are fixedly connected to the rods on both sides of the U-shaped rod (205) located in the middle.

3. The rubber preheating device according to claim 1, characterized in that: The air preheating structure includes an air pump (208) fixedly connected to the outer wall of the top of the cover plate (2), and an air extraction pipe (209) and an air delivery pipe (210) are fixedly connected to both ends of the air pump (208). An air bucket (211) is fixedly connected to one end of the air extraction pipe (209) away from the air pump (208). The air bucket (211) is fixedly connected to one side plate of the quantitative feeding hopper (201). A filter screen (212) is tightly clamped in the inner wall of the air bucket (211).

4. The rubber preheating device according to claim 3, characterized in that: An arc-shaped groove plate (213) is fixedly connected to the outer wall of one side of the quantitative feeding hopper (201). Multiple heating tubes (214) are fixedly connected to the inner wall of the top of the arc-shaped groove plate (213), and multiple air outlets (215) are opened on the bottom plate of the arc-shaped groove plate (213). Three infrared radiation plates (216) are fixedly connected to the outer wall of the bottom plate of the arc-shaped groove plate (213). The end of the air supply pipe (210) away from the air pump (208) is fixedly connected to the top plate of the arc-shaped groove plate (213).

5. The rubber preheating device according to claim 1, characterized in that: The pushing structure includes an L-shaped support plate (217) fixedly connected to the base (1). An electric telescopic rod (218) is fixedly connected to the outer wall of the end plate of the L-shaped support plate (2) facing the cover plate (2). A hollow sleeve plate (219) is fixedly connected to the movable end of the electric telescopic rod (218).

6. The rubber preheating device according to claim 5, characterized in that: The hollow sleeve plate (219) is slidably connected to one end of the cover plate (2), and an extension plate (220) is slidably connected to the inner wall of the hollow sleeve plate (219). The extension plate (220) and the rubber sheet (202) are intermittently connected.

7. The rubber preheating device according to claim 6, characterized in that: Two springs (221) are fixedly connected between the inner wall of the slot of the hollow sleeve plate (219) and one end plate of the extension plate (220). An oblique arc groove (222) is provided on the top plate of the end of the hollow sleeve plate (219) away from the electric telescopic rod (218).

8. The rubber preheating device according to claim 7, characterized in that: A T-shaped rod (223) is fixedly connected to the outer wall of the top plate of the extension plate (220). The surface of the rod (223) near the bottom end is in close contact with the groove wall of the inclined arc groove (222).

9. The rubber preheating device according to claim 8, characterized in that: The T-shaped rod (223) can be intermittently attached to the outer wall of the rod near the top of the rod, and the bottom plate of the L-shaped rod (224) is fixedly connected to the base (1).

10. The rubber preheating device according to claim 1, characterized in that: The collection box (101) has four casters fixedly connected to the outer wall of the bottom end of the box body, which are used to quickly and uniformly transfer the collected preheated rubber sheet (202). A shaft (225) is fixedly connected to the base (1) directly above the collection box (101). A metal partition (226) is rotatably connected to the shaft (225). Torsion springs (227) are fixedly connected between the outer wall of the two ends of the partition (226) and the inner wall of the base (1). The rubber sheet (202) and the partition (226) can be intermittently fitted together.

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