A natural rubber cooling processing system

Abstract

The present application relates to a kind of natural rubber cooling processing system. Including spray screening device, grid conveyor belt and cooling device. Spray screening device, including acceleration conveyor belt and high-pressure spray nozzle, for the dry stirred rubber material is sprayed according to different volume and is screened;Grid conveyor belt is used to transport screened rubber material;Cooling device includes shell, reciprocating multi-layer conveying part, upper exhaust part and lower air supply part;Material is transported by reciprocating multi-layer conveying part in the cooling device, and is discharged from cooling device to next processing link after being air-cooled by the cooperation of upper exhaust part and lower air supply part.The present application realizes the rapid cooling (below 60 DEG C) of dry stirred high-temperature rubber particles (110-140 DEG C) before cooling;Solve the problem of product color deepening caused by long time high temperature damage to rubber product performance and scorching;Stabilize product quality.

Description

Technical Field

[0001] This invention relates to the field of rubber processing cooling, and in particular to a natural rubber cooling processing system. Background Technology

[0002] High-performance specialty tire rubber is produced using latex-labeled rubber or gel-labeled rubber, as well as other semi-finished products such as purchased smoked sheet rubber, as raw materials. The process involves deep processing, including sawing, compounding, mixing, cooling, testing, and packaging, to produce granular rubber that meets standard tire rubber technical specifications. In the tire rubber processing, many steps require heating the rubber to over 100℃, reaching a maximum of 170℃, and then cooling the granules to below 60℃ within the following 30-60 minutes. After weighing, balancing, and packaging, the final product is formed into block-shaped rubber bales.

[0003] Currently, for the lumpy material after secondary mixing in high-performance tire dry mixing lines, the temperature is between 110℃ and 140℃, and the thermal conductivity is 0.15-0.21 W / m·℃. Due to its low thermal conductivity and high temperature after secondary mixing, heat dissipation is difficult during the cooling process, resulting in low processing efficiency of the production line.

[0004] Most existing cooling equipment on the market operates continuously, with main cooling methods including natural air cooling, water spraying + immersion + air blowing, air conditioning cooling, and indirect cooling with circulating water-cooled metal rollers. However, simple cooling methods like natural air and water spraying rely on the sensible heat changes of water or air to remove heat from the rubber particles, resulting in relatively low cooling efficiency and large factory footprint. Using immersion tanks with air blowing for heat exchange can lead to excessive water loss from the rubber particles, potentially causing them to revert to their original state in subsequent processes. Furthermore, prolonged immersion in high-temperature rubber can cause organic compounds in the water to leach out and contaminate the cooling water, requiring periodic drainage. While indirect cooling with circulating water-cooled metal rollers solves the water pollution problem, it still suffers from low cooling efficiency and low equipment return on investment.

[0005] Furthermore, rubber is elastic at room temperature, capable of significant deformation under minimal external force, and returns to its original shape after the force is removed. Rubber is a completely amorphous polymer with a low glass transition temperature and a very high molecular weight, often exceeding hundreds of thousands. Existing rubber cooling devices cannot flatten the rubber during placement, easily leading to incomplete cooling. In addition, due to the inherent viscosity of rubber, multiple pieces tend to stick together when the hopper of the cold treatment machine discharges onto the conveyor belt. This necessitates manual weighing and counterweighting of the rubber pieces according to national standards (35±0.5%), resulting in low production efficiency and making it difficult to automate the weighing and counterweighting process. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a natural rubber cooling and processing system. First, the rubber material after dry mixing and secondary mixing is screened. Then, large pieces requiring cooling are fed into a cooling device for sheet-like cooling. Finally, the screened pieces of varying sizes are precisely weighed and packaged. The entire process involves separate management of the rubber material to prevent it from sticking together. Specifically, the objective of this invention is achieved as follows:

[0007] A natural rubber cooling processing system, comprising:

[0008] The blow-through screening device includes an accelerating conveyor belt and a high-pressure jet nozzle, which is used to blow-through and screen dry-mixed rubber materials according to different volumes.

[0009] Grid conveyor belts are used to transport screened rubber materials;

[0010] A cooling device includes a housing, a reciprocating multi-layer conveyor section, an upper exhaust section, and a lower air supply section. The housing has an inlet on its upper surface and an outlet on its side. The inlet and outlet are located at opposite ends of the housing. The reciprocating multi-layer conveyor section includes at least five layers of perforated conveyor belts, a drive motor, and guide plates. Adjacent layers of perforated conveyor belts have opposite conveying directions; material falls from the end of the perforated conveyor belt in one direction and enters the front of the next layer. The guide plates are inclined and installed at the end of each perforated conveyor belt in one direction, allowing material to fall obliquely into the next layer after being output from each layer. The drive motor drives the perforated conveyor belts. The upper exhaust section is installed on the upper surface of the housing, and the lower air supply section is installed on the lower surface of the housing. Both the upper exhaust section and the lower air supply section include multiple fans. The upper exhaust section discharges air from inside the housing upwards, and the lower air supply section sends air from outside the housing upwards into the housing.

[0011] Furthermore, the cooling device also includes a pressing section; the pressing section is installed at the starting end of the conveying direction of the mesh conveyor belt and can perform pressing processing on rubber materials.

[0012] Furthermore, the tableting section includes two tableting rollers that are axially parallel to each other and have a certain gap. The two tableting rollers rotate at the same speed and in opposite directions. The material enters from above the gap between the two tableting rollers. The tableting rollers are provided with a hollow interlayer, and coolant can be introduced into the interlayer from both ends or one end.

[0013] Furthermore, the fixed positions at both ends of the tableting roller are adjustable, and the gap between the tableting rollers is 0.5 to 0.9 mm.

[0014] Furthermore, the high-pressure nozzle is installed on the outside of the output end of the accelerating conveyor belt, and its spray direction is obliquely downward and opposite to the conveying direction of the accelerating conveyor belt; below the spray screening device, grid conveyor belts are arranged sequentially along the direction of the accelerating conveyor belt. When the rubber material is thrown out from the output end of the accelerating conveyor belt, the high-pressure nozzle sprays the rubber material to change the trajectory of rubber materials of different sizes, so that rubber materials of different sizes fall onto different grid conveyor belts for conveying.

[0015] Furthermore, the spray screening device is also equipped with an insulation shell and a visual imaging device. The accelerating conveyor belt, high-pressure nozzle and visual imaging device are all installed inside the insulation shell. A discharge port is opened at the bottom of the insulation shell corresponding to the position of the grid conveyor belt. A heat medium inlet is opened at the top of the insulation shell.

[0016] Furthermore, the internal temperature of the spray screening device is ≥90°C by introducing a heat medium into the interior of the insulation shell.

[0017] Furthermore, the grid spacing of the grid conveyor belt is less than 200mm.

[0018] Furthermore, it also includes a batching end, which includes a briquetting box, a batching conveyor belt, and a batching scale; the large pieces of rubber material screened by the blowing and screening device are discharged from the outlet of the cooling device and sent to the briquetting box; the briquetting box is sent to the batching scale along the batching conveyor belt, and the small pieces of rubber material screened by the blowing and screening device are sent to the briquetting box by the grid conveyor belt until the briquetting box reaches the standard weight and then continues to be sent to the next stage for briquetting and packaging.

[0019] Furthermore, the mass of the small pieces of rubber material screened by the blowing and screening device is ≤175g.

[0020] After the second mixing of the lumpy material in the dry mixing processing line, it enters the blowing and screening device 1. It is accelerated and conveyed by the accelerating conveyor belt 11. At the output end of the accelerating conveyor belt 11, small pieces of rubber material are ejected through high-pressure nozzles 12, which spray them obliquely downwards relative to the conveying direction. This alters the trajectory of the rubber material as it is ejected from the accelerating conveyor belt 11, causing it to fall onto different grid conveyor belts 2 at the lower end of the blowing and screening device 1. Small pieces of rubber material with a mass ≤175g are directly conveyed downstream via the grid conveyor belts 2 without entering the cooling device 3 for cooling. The remaining rubber material is sent to the cooling device 3 via the grid conveyor belts 2 for cooling. In the cooling device 3, the material first undergoes tableting in the tableting section 35, and then passes through the upper exhaust section 33 and the lower air supply section 34 for air cooling of the material on the mesh conveyor belt inside the cooling device 3. After the rubber material inside the final cooling device 3 is cooled to below 60°C, it is discharged from the outlet 37 of the cooling device 3. The rubber material discharged from the cooling device 3 is sent into the briquetting box of the batching end 4, and is conveyed by the batching conveyor belt. When it reaches the batching scale, the small pieces of rubber material screened by the blow-drying screening device 1 are added for counterweighting according to the weight difference. After the required weight is achieved, it is sent to the next stage for briquetting and packaging. The baffles on the mesh conveyor belt and the grid conveyor belt 2 are used to prevent the rubber material from sticking together and to facilitate cooling and subsequent counterweighting.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention solves the problem of rapidly cooling high-temperature rubber granules (110-140℃) to below 60℃ before the initial cooling stage after dry mixing, avoiding the damage to rubber product performance caused by prolonged high temperatures and problems such as product color darkening and odor caused by scorching; it also enables the sorting of rubber blocks of different specifications after dry mixing, thus providing technical support for the automation of subsequent weighing and counterweighting processes, stabilizing product quality while improving the automation level of the production line. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the system described in this invention;

[0024] Figure 2 This is a top view of the overall structure of the system described in this invention;

[0025] Figure 3 This is a front cross-sectional view of the jet-blowing screening device described in this invention;

[0026] Figure 4 This is a three-dimensional cross-sectional view of the jet-blowing screening device described in this invention;

[0027] Figure 5 This is a front sectional view of the cooling device described in this invention;

[0028] Figure 6 This is a three-dimensional structural diagram of the cooling device described in this invention;

[0029] Figure 7 This is a three-dimensional structural diagram of the tablet compression section described in this invention;

[0030] Figure 8 This is a front cross-sectional view of the tableting section described in this invention.

[0031] In the picture:

[0032] 1—Pulse-blowing screening device; 11—Accelerating conveyor belt; 12—High-pressure jet nozzle; 13—Insulated shell; 14—Visual imaging device; 15—Heat medium inlet; 2—Grid conveyor belt; 3—Cooling device; 31—Shell; 32—Reciprocating multi-layer conveyor section; 33—Upper exhaust section; 34—Lower air supply section; 35—Tableting section; 351—Tableting roller; 36—Feed inlet; 37—Discharge outlet; 4—Dispensing end. Detailed Implementation

[0033] To make the technical means, inventive features, and objectives of this invention easier to understand, the technical solution of this invention will be further explained below with reference to one embodiment and specific implementation of a natural rubber cooling processing system provided by this invention.

[0034] like Figure 1-8 As shown, specific embodiments of the present invention are as follows:

[0035] A natural rubber cooling and processing system includes a blow-screening device 1, a cooling device 3, and a batching end 4.

[0036] The blow-through screening device 1 is equipped with an insulated shell 13, a visual imaging device 14, an accelerating conveyor belt 11, and a high-pressure nozzle 12. It is used to blow-through and screen dry-mixed rubber materials according to different volumes. An inlet 36 is provided above the insulated shell 13, and the accelerating conveyor belt 11 accelerates and transports the rubber material entering through the inlet 36 to the other end. Three outlets 37 are provided below the insulated shell 13 corresponding to the positions of the grid conveyor belts 2; a heat medium inlet 15 is provided above the insulated shell 13. By introducing heat medium into the insulated shell 13, the internal temperature of the blow-through screening device 1 is maintained at ≥90℃. A visual imaging device 14 is also provided above the accelerating conveyor belt 11. The high-pressure nozzle 12 is installed outside the output end of the accelerating conveyor belt 11, with its spray direction diagonally downwards opposite to the conveying direction of the accelerating conveyor belt 11; three grid conveyor belts 2 are sequentially arranged below the blow-through screening device 1 along the direction of the accelerating conveyor belt 11. When the visual imaging device 14 detects materials that need to be screened on the accelerating conveyor belt 11, the rubber materials are thrown out from the output end of the accelerating conveyor belt 11. The high-pressure spray nozzle 12 sprays the rubber materials and changes the trajectory of rubber materials of different sizes, so that rubber materials of different sizes fall onto different grid conveyor belts 2 for conveying.

[0037] Cooling device 3 includes a housing 31, a reciprocating multi-layer conveyor section 32, an upper exhaust section 33, and a lower air supply section 34; the housing 31 has an inlet 36 on its upper surface and an outlet 37 on its side; the inlet 36 and the outlet 37 are located at opposite ends of the housing 31; the reciprocating multi-layer conveyor section 32 includes five layers of mesh conveyor belts, a drive motor, and guide plates; the conveying directions of adjacent mesh conveyor belts are opposite, and the material falls from the end of the mesh conveyor belt in the conveying direction of the lower mesh conveyor belt and enters the front end of the lower mesh conveyor belt in the conveying direction; the guide plates are inclinedly installed on each layer of mesh conveyor belts. At the end of the conveyor belt in the conveying direction, material is output from each layer of the mesh conveyor belt and falls obliquely into the next layer of the mesh conveyor belt through the guide plate; the drive motor is used to drive the mesh conveyor belt to move; the upper exhaust air section 33 is installed on the upper surface of the housing 31, and the lower air supply air section 34 is installed on the lower surface of the housing 31; both the upper exhaust air section 33 and the lower air supply air section 34 include multiple fans; the upper exhaust air section 33 can discharge the air inside the housing 31 upwards, and the lower air supply air section 34 can send the air outside the housing 31 upwards into the housing 31. The pressing section 35 is installed at the beginning of the conveying direction of the first, third, and fifth layers of the mesh conveyor belt, and can perform pressing processing on the rubber material. The pressing section 35 includes two pressing rollers 351 that are axially parallel to each other and have a certain gap. The two pressing rollers 351 rotate at the same speed and in opposite directions, and the material enters from above the gap between the two pressing rollers 351. The fixed positions at both ends of the tablet pressing roller 351 are adjustable, and the gap between the tablet pressing rollers 351 is 0.5 to 0.9 mm. The tablet pressing roller 351 is provided with a hollow interlayer, and coolant can be introduced into the interlayer from both ends. Baffles are provided perpendicular to the conveying direction on the surface of the fifth layer mesh conveyor belt, and the distance between the two baffles is less than 200 mm.

[0038] The batching end 4 includes a briquetting box, a batching conveyor belt, and a batching scale. Large and medium-sized pieces of rubber material screened by the blow-drying screening device 1 are fed into the cooling device 3 via the grid conveyor belt 2 and then discharged from the outlet 37 of the cooling device 3 into the briquetting box. The briquetting box is conveyed along the batching conveyor belt to the batching scale. Small pieces of rubber material with a mass ≤175g screened by the blow-drying screening device 1 are conveyed to the briquetting box via the grid conveyor belt 2 until the briquetting box reaches the standard weight, after which it continues to be conveyed to the next stage for briquetting and packaging. The grid spacing of the grid conveyor belt 2 is less than 200mm.

[0039] After the second mixing of the lumpy material in the dry mixing processing line, it enters the blowing and screening device 1 and is accelerated by the accelerating conveyor belt 11. The material is then ejected from the output end of the accelerating conveyor belt 11. When the vision imaging device 14 detects small and medium-sized pieces of material that need to be screened, it sends a signal to the high-pressure nozzle 12. The high-pressure nozzle 12 sprays the small and medium-sized pieces of rubber material at an angle downwards relative to the conveying direction. This alters the trajectory of the rubber material as it is ejected from the output end of the accelerating conveyor belt 11, causing it to fall onto the three grid conveyor belts 2 at the lower end of the blowing and screening device 1. The screened small pieces of rubber material, with a mass ≤175g, are directly conveyed downstream via the grid conveyor belts 2 without entering the cooling device 3 for cooling. The remaining rubber material is sent to its respective cooling device 3 via its grid conveyor belt 2 for cooling. In the cooling device 3, the material is first compressed by the pressing section 35 and then conveyed by the mesh conveyor belt. During conveying, the material on the mesh conveyor belt inside the cooling device 3 is cooled by air through the upper exhaust fan 33 and the lower air supply fan 34. At this time, the upper exhaust fan 33 draws out the gas from the housing 31, and the lower air supply fan 34 fills the housing 31 with gas. Each time the material is pressed and rebounds to a certain state, it is pressed and conveyed again. After pressing and air cooling are repeated three times, the rubber material inside the cooling device 3 is finally cooled to below 60°C and discharged from the outlet 37 of the cooling device 3. The rubber material discharged from the cooling device 3 is sent to the briquetting box at the batching end 4 and conveyed by the batching conveyor belt. Large pieces of material and medium pieces of material are added in sequence in the figure. When it is sent to the batching scale, the small pieces of rubber material screened by the blowing and screening device 1 are added for counterweighting according to the weight difference. After the required weight is set, it is sent to the next stage of briquetting and packaging.

[0040] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A natural rubber cooling and processing system, characterized in that, include: The blow-through screening device (1) includes an accelerating conveyor belt (11) and a high-pressure nozzle (12) for blowing and screening the dry-mixed rubber material according to different volumes; A grid conveyor belt (2) is used to transport screened rubber materials; The cooling device (3) includes a housing (31), a reciprocating multi-layer conveyor section (32), an upper exhaust section (33), and a lower air supply section (34); the housing (31) has an inlet (36) on its upper surface and an outlet (37) on its side; the inlet (36) and the outlet (37) are located at both ends of the housing (31); the reciprocating multi-layer conveyor section (32) includes at least five layers of mesh conveyor belts, a drive motor, and a guide plate; the conveying directions of two adjacent mesh conveyor belts are opposite, and the material falls from the end of the mesh conveyor belt in the conveying direction and enters the front end of the lower mesh conveyor belt in the conveying direction; the guide plate is inclinedly installed on each mesh layer. At the end of the conveyor belt in the conveying direction, the material is output from each layer of the mesh conveyor belt and falls obliquely into the next layer of the mesh conveyor belt through the guide plate; the drive motor is used to drive the mesh conveyor belt to move; the upper exhaust fan (33) is installed on the upper surface of the housing (31), and the lower air supply fan (34) is installed on the lower surface of the housing (31); both the upper exhaust fan (33) and the lower air supply fan (34) include multiple fans; the upper exhaust fan (33) can discharge the air inside the housing (31) upwards into the housing (31), and the lower air supply fan (34) can send the air outside the housing (31) upwards into the housing (31); The small pieces of rubber material screened by the blowing and screening device (1) are directly transported downstream by the grid conveyor belt (2) without entering the cooling device (3) for cooling. The remaining rubber material is sent into the cooling device (3) for cooling by the grid conveyor belt (2). The cooling device (3) also includes a pressing section (35); the pressing section (35) is installed at the starting end of the conveying direction of the mesh conveyor belt and can press rubber materials into sheets. It also includes a batching end (4), which includes a briquetting box, a batching conveyor belt, and a batching scale. The large pieces of rubber material screened by the blowing and screening device (1) are discharged from the outlet (37) of the cooling device (3) and sent to the briquetting box. The briquetting box is sent to the batching scale along the batching conveyor belt. The small pieces of rubber material screened by the blowing and screening device (1) are sent to the briquetting box through the grid conveyor belt (2) until the briquetting box reaches the standard weight and then continues to be conveyed to the next stage for briquetting and packaging.

2. The natural rubber cooling and processing system as described in claim 1, characterized in that: The tablet pressing section (35) includes two tablet pressing rollers (351) that are axially parallel to each other and have a certain gap. The two tablet pressing rollers (351) rotate at the same speed and in opposite directions. The material enters from above the gap between the two tablet pressing rollers (351). The tablet pressing rollers (351) are provided with a hollow interlayer, and coolant can be introduced into the interlayer from both ends or one end.

3. The natural rubber cooling and processing system as described in claim 2, characterized in that: The fixed positions at both ends of the tablet pressing roller (351) can be adjusted, and the gap between the tablet pressing rollers (351) is 0.5 to 0.9 mm.

4. The natural rubber cooling and processing system as described in claim 1, characterized in that: The high-pressure nozzle (12) is installed on the outside of the output end of the acceleration conveyor belt (11), and its spray direction is obliquely downward and opposite to the conveying direction of the acceleration conveyor belt (11). Below the spray screening device (1), a grid conveyor belt (2) is arranged in sequence along the direction of the acceleration conveyor belt (11). When the rubber material is thrown out from the output end of the acceleration conveyor belt (11), it is sprayed by the high-pressure nozzle (12) to change the trajectory of rubber materials of different sizes, so that rubber materials of different sizes fall onto different grid conveyor belts (2) for conveying.

5. The natural rubber cooling and processing system as described in claim 4, characterized in that: The spray screening device (1) is also provided with a heat insulation shell (13) and a visual imaging device (14). The accelerating conveyor belt (11), the high-pressure nozzle (12) and the visual imaging device (14) are all installed inside the heat insulation shell (13). A discharge port (37) is opened below the heat insulation shell (13) corresponding to the position of the grid conveyor belt (2). A heat medium inlet (15) is opened above the heat insulation shell (13).

6. The natural rubber cooling and processing system as described in claim 5, characterized in that: The internal temperature of the spray screening device (1) is ≥90°C by introducing a heat medium into the interior of the insulation shell (13).

7. The natural rubber cooling and processing system as described in claim 1, characterized in that: The grid spacing of the grid conveyor belt (2) is less than 200 mm.

8. The natural rubber cooling and processing system as described in claim 1, characterized in that: The mass of small pieces of rubber material screened by the blow-through screening device (1) is ≤175g.

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