Method and apparatus for rapid cooling in rubber processing for tires

Abstract

The present application relates to a kind of rubber processing method and equipment for fast cooling of tire.The method comprises the following steps: S1, discrete material, after dry stirring rubber block material is dispersed, avoid too much concentration of material in next link;S2, cooling;Including S2.1 tabletting and S2.2 air cooling;S2.1 tabletting;After the discrete material is tabletted, the thickness of the material after tabletting is 0.5-0.9mm;S2.2 air cooling;The material after tabletting is air-cooled and cooled;S3, discharge;After the rubber material P0 of step S2 cooling is discharged, PRI is greater than or equal to 32, greater than or equal to 55, the range of mooney viscosity is 70-90ML, tensile strength is greater than or equal to 21MPa, elongation at break is greater than or equal to 700%.The method realizes that the high-temperature rubber particles of 110-140℃ before cooling after dry stirring are rapidly cooled to below 60℃;Solve the problem of product color deepening caused by long time high temperature damage and scorching to rubber product performance;Solve the quality problem of mutual adhesion of standard rubber package after block re-warming and packing box.

Description

Technical Field

[0001] This invention relates to the field of rubber cooling and processing, and in particular to a method and equipment for rapid cooling in the processing of tire rubber. Background Technology

[0002] In the processing of tire rubber, many steps require heating the rubber to over 100℃, reaching as high as 170℃, and then cooling the rubber particles to below 60℃ within the following 30-60 minutes. Most existing cooling equipment on the market operates continuously, and its main cooling methods include: natural air cooling, water spraying + immersion + air blowing, air conditioning cooling, and indirect cooling with circulating water-cooled metal rollers, etc.

[0003] However, simple cooling methods such as natural wind 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 a large factory footprint. Using a water tank and airflow for heat exchange is problematic because the rubber particles, being immersed in water, can carry away excessive moisture, potentially leading to a reverse reaction in subsequent processes. Furthermore, the water in the tank, constantly soaked in high-temperature rubber, can cause some organic compounds from the rubber to leach out and contaminate the cooling water, requiring periodic drainage and treatment. While using circulating water to cool metal rollers for indirect cooling solves the water pollution problem, it still suffers from low cooling efficiency and a low return on investment.

[0004] Currently, the temperature of the blocky material after secondary mixing in high-performance tire dry mixing lines is between 110 and 140°C, with a thermal conductivity of 0.15-0.21 W / m·°C. 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. Therefore, it is necessary to develop a cooling method to achieve rapid cooling. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method and apparatus for rapid cooling in tire rubber processing. Several pairs of hollow rollers, each circulating a cooling medium, extrude the material into sheets. Simultaneously, air cooling is used to cool the material during and after the extrusion process. This improves heat dissipation efficiency by thinning the material and allows heat to be directly removed from the material through heat conduction via the rollers and the internal circulating cooling medium. Specifically, the objective of this invention is achieved as follows:

[0006] A method for rapid cooling during the processing of tire rubber includes the following steps:

[0007] S1, Discrete material, to disperse the rubber block material after dry mixing and stirring, so as to avoid the material being too concentrated in the next stage;

[0008] S2, Cooling; including S2.1 tableting and S2.2 air cooling;

[0009] S2.1 Tableting; The dispersed material is tableted to a thickness of 0.5–0.9 mm; S2.2 Air cooling; The tableted material is cooled by air cooling.

[0010] S3, Discharge; The rubber material discharged after cooling in step S2 has P0≥32, PRI≥55, Mooney viscosity range of 70-90ML, tensile strength≥21MPa, and elongation at break≥700%.

[0011] Furthermore, in step S2.1, a pressing roller is used to press the rubber material into tablets. The pressing roller includes two rollers that are axially parallel to each other and have a certain gap. The two rollers rotate at the same speed and in opposite directions. The material enters from above the gap between the two rollers. Cooling liquid is introduced into the pressing roller while pressing the material into tablets.

[0012] Furthermore, the linear speed of the tableting roller is ≥40m / min; the temperature of the coolant is ≤32℃.

[0013] Furthermore, when the thickness of the rubber material after air cooling in step S2.2 rebounds to 3-8mm, step S2 is repeated, and after repeating step S2 three times, step S3 is entered.

[0014] Furthermore, after the first step S2 treatment, the temperature of the rubber material is reduced to 90-110°C; after the second step S2 treatment, the temperature of the rubber material is reduced to 80-95°C; and after the third step S2 treatment, the temperature of the rubber material is reduced to 60-70°C.

[0015] Furthermore, during step S2 cooling, the ambient temperature is maintained at ≤37℃ and the relative humidity at ≤43%. In step S2.2, the material is placed on a multi-layer mesh belt conveyor for air cooling, with the airflow perpendicular to the mesh belt. The mesh belt width is 700mm, the mesh belt conveying speed is ≥44m / min, the air cooling speed is ≥3m / s, the air cooling temperature is ≤37℃, and the air cooling time is ≤4min.

[0016] Furthermore, before step S1, a water mist cooling step is included; the water mist cooling step involves spraying and wetting the rubber block material with a temperature ≥130℃ and a moisture content ≤0.1% after dry mixing and stirring; the spraying time is ≤0.5s, and the atomized particles are ≤50um; the material after the water mist cooling step is dispersed in step S1 for a duration ≥30s; the material is dispersed in step S1 using a high-speed belt conveyor to complete the dispersion, the high-speed belt has a bandwidth of 600mm and a belt speed ≥36m / min.

[0017] An apparatus for rapid cooling in tire rubber processing includes: a housing, a reciprocating multi-layer conveyor section, an upper exhaust section, a lower air supply section, and a pressing 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 multiple mesh conveyor belts, a drive motor, and guide plates; adjacent mesh conveyor belts have opposite conveying directions, and material falls from the end of the mesh conveyor belt in one conveying direction and enters the front end of the next mesh conveyor belt in the conveying direction; the guide plates are inclinedly installed in the conveying direction of each mesh conveyor belt. At the end, after being output from each layer of the perforated conveyor belt, the material falls obliquely into the next layer of the perforated conveyor belt via a guide plate; the drive motor is used to drive the perforated conveyor belt to move; the upper exhaust fan is installed on the upper surface of the housing, and the lower air supply fan is installed on the lower surface of the housing; both the upper exhaust fan and the lower air supply fan include multiple fans; the upper exhaust fan can discharge the air inside the housing upwards, and the lower air supply fan can send the air outside the housing upwards into the housing; the pressing fan is installed at the starting end of the conveying direction of the perforated conveyor belt and can perform pressing processing on the rubber material.

[0018] 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 sandwich layer, into which coolant can be introduced. The tableting section is installed at the starting end of the conveying direction of the first, third, and fifth mesh conveyor belts.

[0019] The beneficial effects of this invention are as follows:

[0020] It enables rapid cooling of high-temperature rubber granules (110-140℃) to below 60℃ after dry mixing and cooling; solves problems such as damage to rubber product performance caused by prolonged high temperature and darkening of product color caused by scorching; and solves the quality problem of standard rubber bags sticking together after being packed into boxes due to the warming of rubber blocks. Attached Figure Description

[0021] Figure 1 This is a flowchart of the method described in this invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the cooling device described in this invention;

[0023] Figure 3 This is a rear view of the cooling device described in this invention;

[0024] Figure 4 This is a front sectional view of the cooling device described in this invention;

[0025] Figure 5 This is a perspective view of the tableting section in use according to the present invention;

[0026] Figure 6 This is a three-dimensional structural diagram of the tablet compression section described in this invention;

[0027] Figure 7 This is a front cross-sectional view of the tableting section of the present invention in use.

[0028] In the picture:

[0029] 1—Shell; 2—Reciprocating multi-layer conveyor; 3—Upper exhaust section; 4—Lower air supply section; 5—Plate pressing section; 51—Plate pressing roller; 6—Feed inlet; 7—Discharge outlet. Detailed Implementation

[0030] 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 of a method and equipment for rapid cooling in tire rubber processing and specific implementation methods.

[0031] like Figure 1-7 As shown, specific embodiments of the present invention are as follows:

[0032] A method for rapid cooling during the processing of tire rubber includes the following steps:

[0033] Water mist cooling: The rubber block material with a temperature ≥130℃ and a moisture content ≤0.1% after dry mixing and stirring is sprayed to wet it; the spraying time is ≤0.5s and the atomized particles are ≤50um.

[0034] S1, Discrete Material: The rubber block material cooled by water mist is dispersed using a high-speed belt conveyor to prevent excessive material concentration in the next stage. The high-speed belt has a bandwidth of 600mm and a belt speed of ≥36m / min. The high-speed belt conveys the material for ≥30s, allowing some evaporation of the atomized particles on the surface of the material passing through the water mist cooling zone, ensuring that the moisture content matches that of the rubber blocks in the existing cooling process.

[0035] S2, Cooling; including S2.1 tableting and S2.2 air cooling; maintain ambient temperature ≤37℃ and relative humidity ≤43%.

[0036] S2.1 Tableting; The rubber material is tableted using a tableting roller 51, which includes an axial...

[0037] A pair of parallel rollers with a certain gap rotate at the same speed in opposite directions. Material enters from above the gap between the rollers. While the tableting roller 51 is used for tableting, coolant is introduced into the roller 51. The thickness of the tableted material is 0.5–0.9 mm. The linear velocity of the tableting roller 51 is ≥40 m / min; the coolant temperature is ≤32℃. During tableting, air at ≥3 m / s and ≤37℃ is used to cool the exterior of the tableting roller 51.

[0038] S2.2 Air cooling; The material after tableting is cooled by air cooling; The material is placed on a multi-layer mesh belt conveyor for air cooling, with the airflow passing perpendicularly through the mesh belt; The mesh belt width is 700mm, the mesh belt conveying speed is ≥44m / min; the air cooling speed is ≥3m / s, the air cooling temperature is ≤37℃, and the air cooling time is ≤4min.

[0039] When the thickness of the rubber material after air cooling in step S2.2 rebounds to 3-8 mm, step S2 is repeated. After repeating step S2 three times, step S3 is entered. After the first step S2 treatment, the temperature of the rubber material drops to 90-110℃. After the second step S2 treatment, the temperature of the rubber material drops to 80-95℃. After the third step S2 treatment, the temperature of the rubber material drops to 60-70℃.

[0040] S3, Discharge; The rubber material discharged after cooling in step S2 has P0≥32, PRI≥55, Mooney viscosity range of 70-90ML, tensile strength≥21MPa, and elongation at break≥700%.

[0041] An apparatus for achieving rapid cooling in the aforementioned tire rubber processing includes: a housing 1, a reciprocating multi-layer conveyor section 2, an upper exhaust section 3, a lower air supply section 4, and a pressing section 5. A feed inlet 6 is provided on one side of the upper surface of the housing 1, and a discharge outlet 7 is provided on the bottom side of the housing 1 opposite to the feed inlet 6; the feed inlet 6 and discharge outlet 7 are located at opposite ends of the housing 1. The reciprocating multi-layer conveyor section 2 includes five layers of perforated conveyor belts, driven by a drive motor. The conveying directions of adjacent layers of perforated conveyor belts are opposite; material falls from the end of the perforated conveyor belt in the conveying direction and enters the front end of the next layer of perforated conveyor belt in the conveying direction. A guide plate is installed at an angle to the outside of the end of each layer of perforated conveyor belt, allowing material to fall obliquely into the next layer of perforated conveyor belt after being output from each layer. The drive motor is installed on the top of the housing 1, and its output end is connected to the rollers of the perforated conveyor belts via a belt, for driving the movement of the perforated conveyor belts. The upper exhaust air section 3 is installed on the upper surface of the housing 1, and the lower air supply air section 4 is installed on the lower surface of the housing 1. Both the upper exhaust air section 3 and the lower air supply air section 4 include multiple fans. The upper exhaust air section 3 can draw air from inside the housing 1 upwards and discharge it from the housing 1, while the lower air supply air section 4 can transport air from outside the housing 1 upwards and send it into the housing 1. The pressing section 5 is installed at the starting end of the conveying direction of the first, third, and fifth mesh conveyor belts and can perform pressing processing on rubber materials.

[0042] The tableting section 5 includes two tableting rollers 51 that are axially parallel to each other and have a certain gap. The two tableting rollers 51 rotate at the same speed and in opposite directions. The material enters from above the gap between the two tableting rollers 51. The tableting rollers 51 are provided with a sandwich layer, into which coolant can be introduced.

[0043] Combining the above equipment with this cooling method, it is possible to achieve the core objective of "rapidly cooling the rubber block after two mixing to 60℃ within 5 minutes" when the temperature of the rubber block after two mixing is ≥130℃ and the moisture content is ≤0.1% of the incoming material. This can be achieved by using the technical route of "water spray cooling, discrete material, roller pressure conduction cooling combined with air cooling, and multi-layer mesh belt air cooling".

[0044] 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 device for rapid cooling in tire rubber processing, characterized in that, include: The housing (1), the reciprocating multi-layer conveyor section (2), the upper exhaust section (3), the lower air supply section (4), and the pressing section (5) are all included. The upper surface of the housing (1) is provided with a feed inlet (6), and the side is provided with a discharge outlet (7). The feed inlet (6) and the discharge outlet (7) are located at both ends of the housing (1). The reciprocating multi-layer conveyor section (2) includes multiple mesh conveyor belts, a drive motor, and a guide plate. The conveying directions of two adjacent mesh conveyor belts are opposite. After the material falls from the end of the mesh conveyor belt in the conveying direction, it enters the front end of the lower mesh conveyor belt in the conveying direction. The guide plate is installed at an angle at the end of the conveying direction of each mesh conveyor belt. After the material is output from each mesh conveyor belt, it falls obliquely into the next mesh conveyor belt through the guide plate. Conveyor belt; the drive motor is used to drive the mesh conveyor belt to move; the upper exhaust fan (3) is installed on the upper surface of the housing (1), and the lower air supply fan (4) is installed on the lower surface of the housing (1); both the upper exhaust fan (3) and the lower air supply fan (4) include multiple fans; the upper exhaust fan (3) can discharge the air inside the housing (1) upwards, and the lower air supply fan (4) can send the air outside the housing (1) upwards into the housing (1); the pressing fan (5) is installed at the starting end of the conveying direction of the mesh conveyor belt and can press the rubber material into sheets; the pressing fan (5) is installed at the starting end of the conveying direction of the first, third, and fifth layer mesh conveyor belts.

2. The rapid cooling device for tire rubber processing as described in claim 1, characterized in that: The tablet pressing section (5) includes two tablet pressing rollers (51) that are parallel to each other in the axial direction and have a certain gap. The two tablet pressing rollers (51) rotate at the same speed and in opposite directions. The material enters from above the gap between the two tablet pressing rollers (51). The tablet pressing rollers (51) are provided with a sandwich layer, into which coolant can be introduced.

3. A cooling method based on the rapid cooling equipment used in tire rubber processing as described in claim 1, characterized in that, Includes the following steps: S1, Discrete material, to disperse the rubber block material after dry mixing and stirring, so as to avoid the material being too concentrated in the next stage; S2, cooling; Includes S2.1 tableting and S2.2 air cooling; S2.1 Tableting; The discrete material is tableted to a thickness of 0.5–0.9 mm. S2.2 Air cooling; The material after tableting is cooled by air cooling. S3, Discharge; The rubber material discharged after cooling in step S2 has P0≥32, PRI≥55, Mooney viscosity range 70-90ML, tensile strength≥21MPa, and elongation at break≥700%; When the thickness of the rubber material after air cooling in step S2.2 rebounds to 3-8mm, step S2 is repeated. After repeating step S2 three times, step S3 is entered.

4. The cooling method as described in claim 3, characterized in that: In step S2.1, a pressing roller (51) is used to press the rubber material into tablets. The pressing roller (51) includes two rollers that are axially parallel to each other and have a certain gap. The two rollers rotate at the same speed and in opposite directions. The material enters from above the gap between the two rollers. While pressing the tablets with the pressing roller (51), coolant is introduced into the pressing roller (51).

5. The cooling method as described in claim 4, characterized in that: The linear speed of the tablet pressing roller (51) is ≥40 m / min; the temperature of the coolant is ≤32℃.

6. The cooling method as described in claim 5, characterized in that: After the first step S2 treatment, the temperature of the rubber material drops to 90-110℃, and after the second step S2 treatment, the temperature of the rubber material drops to 80-95℃. After the third step S2 treatment, the temperature of the rubber material drops to 60-70℃.

7. The cooling method as described in claim 3, characterized in that: During step S2 cooling, maintain an ambient temperature ≤37℃ and a relative humidity ≤43%; in step S2.2, place the material on a multi-layer mesh belt conveyor for air cooling, with the airflow perpendicular to the mesh belt; the mesh belt width is 700mm, the mesh belt conveying speed is ≥44 m / min; the air cooling speed is ≥3m / s, the air cooling temperature is ≤37℃, and the air cooling time is ≤4min.

8. The cooling method as described in claim 3, characterized in that: Before step S1, a water mist cooling step is included; the water mist cooling step involves spraying and wetting the rubber block material with a temperature ≥130℃ and a moisture content ≤0.1% after dry mixing and stirring; the spraying time is ≤0.5s and the atomized particles are ≤50um; the material after the water mist cooling step is dispersed in step S1 for a duration ≥30s; the material is dispersed in step S1 using a high-speed belt conveyor to complete the dispersion, the high-speed belt has a bandwidth of 600mm and a belt speed ≥36 m / min.

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