A roll cooling device for wet-mixing rubber particles

Abstract

The present application relates to a kind of wet mixing rubber particle cooling device, including shell, cooling roller, feed inlet, discharge outlet;Cooling roller is rotatably arranged in the inside of shell, feed inlet and discharge outlet are located at the both ends of cooling roller, and the horizontal position of feed inlet is higher than discharge outlet;Several mesh holes are set on the wall of cooling roller;Air inlet is set on the shell below cooling roller, and air outlet is set on the shell above cooling roller;When cooling device is used, cooling roller rotates feeding, air enters from air inlet, then passes through cooling roller, and then air outlet is discharged, and the material in cooling roller is cooled.The air direction is perpendicular to cooling roller when the material is cooled, and changing air speed does not affect the lateral position of material, so as to improve cooling efficiency.Under the same capacity, same working length and material temperature conditions, the temperature reduction range is greater than 5 DEG C compared with prior art, and the material temperature uniformity is better than mesh belt cooling mode.

Description

Technical Field

[0001] This invention relates to the field of large-scale processing of natural rubber / fumed silica wet-process rubber granules, and in particular to a roller cooling device for wet-process rubber granules. Background Technology

[0002] The wet compounding process for natural rubber / silica is a new rubber compounding and processing technology researched in recent years both domestically and internationally. This process requires dehydration of the rubber granules. Dehydration typically involves heating the rubber granules with microwaves or a mesh belt hot air convection at atmospheric pressure, drying them through vaporization at atmospheric pressure. After dehydration, the rubber granules enter a cooling zone where they are cooled before being discharged. Cooling zones typically employ two methods: mesh belt cooling and drum cooling. In mesh belt cooling, the material is placed on a perforated mesh belt and cooled by air passing vertically through it. In drum cooling, the material is fed into a drum cooling device where cooling air is introduced along the drum's axial direction.

[0003] In conveyor belt drying, excessively high wind speeds passing through the material layer can disrupt the material distribution on the conveyor belt, easily creating a "broken window effect" and affecting the processing quality of the rubber granules. Therefore, the wind speed on the conveyor belt must be limited to a low range, but low wind speeds also reduce overall cooling efficiency. In drum cooling, rubber granules enter the drum cooling device and are cooled by cooling air along the axial direction of the cooling drum. Existing drum cooling devices, such as the cooling drum screening machine disclosed in Chinese patent document CN205199885U, or the cooling cylinder disclosed in Chinese patent document CN206803823U, all use airflow along the drum axial direction. While cooling, the material rotates inside the drum. If the wind force is too strong, the material's trajectory will be altered by the lateral wind of the cooling device when it falls from a high position, reducing or increasing the cooling time within the cooling device, ultimately failing to achieve the desired cooling effect or reducing cooling efficiency. If the wind force is too weak, the cooling efficiency is low, requiring multiple similar devices to increase production capacity. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a drum cooling device for wet-process rubber granules. It changes the cooling airflow direction of existing drum cooling devices from parallel to the drum axis to perpendicular to the drum axis. This eliminates concerns about excessively high airflow causing a window-breaking effect on the material layer, and also avoids concerns about excessive airflow causing material to shift laterally along the drum axis, thus affecting the cooling effect. Specifically, the objective of this invention is achieved as follows: A roller cooling device for wet-process rubber granules includes: a shell, a cooling roller, a feed inlet, and a discharge outlet; the cooling roller is rotatably disposed inside the shell, the feed inlet and the discharge outlet are located at opposite ends of the cooling roller, and the feed inlet is horizontally higher than the discharge outlet; the cooling roller wall is provided with a plurality of mesh holes; an air inlet is provided on the shell below the cooling roller, and an exhaust outlet is provided on the shell above the cooling roller; when the cooling device is in use, the cooling roller rotates to feed the material, and the air enters from the air inlet, passes through the cooling roller, and exits from the exhaust outlet to cool the material in the cooling roller.

[0005] Furthermore, axial partitions are evenly distributed along the cylinder axis on the outer surface of the cooling drum wall, and sealing strips are extended from the outer side of the axial partitions; the inner wall of the housing is arc-shaped, and the sealing strips contact the inner wall of the housing, with each arc segment of the inner wall of the housing contacting at least two sealing strips simultaneously, so that the sealing strips form a dynamic seal between the cooling drum and the housing.

[0006] Furthermore, the outer surface of the cooling drum wall is provided with circumferential baffles at equal intervals along the drum axis, and the plane of the circumferential baffles is perpendicular to the drum axis; the circumferential baffles are close to but do not contact the shell, and the circumferential baffles divide the cooling drum into multiple cooling zones, and each cooling zone has an air inlet and an air outlet independently opened on the shell below and above it, respectively.

[0007] Furthermore, the air inlet and the air outlet are positioned to the side where more material is distributed when the cooling drum rotates.

[0008] Furthermore, each air inlet is connected to a supply fan, and each air outlet is connected to an exhaust fan; the air temperature and speed within the air supply area formed by each air inlet and exhaust outlet can be adjusted independently.

[0009] Furthermore, each of the air inlets connected to the supply fan and each of the exhaust outlets connected to the exhaust fan is equipped with an air distribution device.

[0010] Furthermore, the air distribution device includes a transverse air distribution section and a longitudinal air distribution section; the air duct outlet of the transverse air distribution section is parallel to the axial direction of the cooling drum, and the air duct outlet of the longitudinal air distribution section is perpendicular to the axial direction of the cooling drum; the transverse air distribution section is close to the cooling drum, and the longitudinal air distribution section is close to the housing; the air from the air inlet first passes through the longitudinal air distribution section and then through the transverse air distribution section before reaching the inside of the drum.

[0011] When using this device to cool materials, the materials enter the cooling drum 12 through the feed inlet 122. The cooling drum 12 then begins to rotate, and the materials gradually move towards the discharge outlet 123 as they rotate, until they are discharged from the discharge outlet 123 and cooled completely. During the cooling process, cooling air is introduced into the air inlet 13 of each cooling zone. The cooling air passes vertically through the cooling drum 12 and is then drawn away through the exhaust outlet 14. The cooling air velocity and temperature of each zone can be individually controlled by the fans at the air inlet 13 and exhaust outlet 14 of that cooling zone, achieving precise control. After exiting the air inlet 13, the air from each cooling zone first passes through the longitudinal air distribution section for a first air distribution to ensure even distribution of the air throughout the entire cooling zone. Then, it passes through the transverse air distribution section for a second air distribution to concentrate the air supply to the relatively thicker parts of the material within that cooling zone.

[0012] The beneficial effects of this invention are as follows: (i) Compared with the prior art, the rubber granules in this invention are cooled by a drum through-flow cooling method, which divides the cooling cylinder into different cooling zones. Each zone is cooled by cold air passing through the interior of the cooling cylinder perpendicular to the cooling cylinder axis. Compared with the mesh belt cooling method, there is no need to worry about the broken window effect caused by excessive wind speed. Compared with the existing drum cooling device, there is no need to worry about the material shifting laterally along the drum axis due to excessive wind speed. At the same time, it can reduce the residence time of the cooling air in the cooling cylinder and avoid the cooling air temperature from rising and reducing efficiency. Under the same production capacity, working length and feed temperature conditions, the cooling range is greater than 5°C compared with the prior art, and the material temperature uniformity is better than that of the mesh belt cooling method.

[0013] (ii) The upward airflow can also increase the time that the material is suspended in the vertical direction, which is conducive to better cooling.

[0014] (iii) The cooling air introduced into different cooling zones for materials at different stages and temperatures can be individually controlled, and the material temperature will not drop sharply due to the cooling air being too low and the material being too high, thus reducing the processing quality. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the cooling device described in this invention; Figure 2 This is a schematic diagram of the internal structure of the cooling device described in this invention; Figure 3 This is a schematic front cross-sectional view of the cooling device described in this invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the cooling drum described in this invention; Figure 5 This is a side cross-sectional view of the cooling device described in this invention; Figure 6This is a side cross-sectional view of the cooling device described in this invention; Figure 7 This is a side cross-sectional view of the cooling device described in this invention; In the picture: 1—Cooling device; 11—Shell; 12—Cooling drum; 121—Rake plate; 122—Feed inlet; 123—Discharge port; 124—Axial baffle; 125—Circumferential baffle; 13—Air inlet; 14—Exhaust outlet; 15—Air distribution device. Detailed Implementation

[0016] 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 the method and equipment for large-scale drying and cooling of wet-mixed rubber granules and specific implementation methods provided by this invention.

[0017] like Figure 1-7 As shown, specific embodiments of the present invention are as follows: A drum cooling device for wet-process rubber granules includes: a shell 11, a cooling drum 12, a feed inlet 122, and a discharge outlet 123. The cooling drum 12 is rotatably disposed inside the shell 11. The feed inlet 122 and the discharge outlet 123 are located at opposite ends of the cooling drum 12. The central axis of the cooling drum 12 forms a certain angle with the horizontal plane, and the horizontal position of the feed inlet 122 is higher than that of the discharge outlet 123. Several mesh holes are formed on the wall of the cooling drum 12. A rake plate 121 is arranged along the axial direction of the drum on the inner surface of the cooling drum 12. One end of the rake plate 121 near the center of the cooling drum 12 is bent in the direction of rotation, which increases the height of the scooped material for easy material distribution. Axial baffles 124 are evenly distributed along the axial direction on the outer surface of the cooling drum 12 wall, and sealing strips are installed on the outer extension of the axial baffles 124. The inner wall of the housing 11 is arc-shaped. The sealing strips contact the inner wall of the housing 11, and at least two sealing strips simultaneously contact each arc segment of the inner wall of the housing 11. The sealing strips create a dynamic seal between the cooling drum 12 and the housing 11. Circular baffles 125 are evenly distributed on the outer surface of the cooling drum 12 along the drum axis, and the plane containing the circumferential baffles 125 is perpendicular to the drum axis. The circumferential baffles 125 divide the cooling drum 12 into four equal cooling zones. Openings are provided on the upper and lower surfaces of the housing 11 at corresponding vertical positions in each cooling zone. The bottom surface of the housing 11 has an air inlet 13, and the top surface has an exhaust outlet 14. The air inlet 13 and exhaust outlet 14 are positioned towards the side where more material is distributed when the cooling drum 12 rotates. Each air inlet 13 is connected to a supply fan, and each air outlet 14 is connected to an exhaust fan. An air distribution device 15 is installed at the connection between each air inlet 13 and the supply fan, and at the connection between each air outlet 14 and the exhaust fan. The air distribution device 15 includes a transverse air distribution section and a longitudinal air distribution section. The air from the air inlet 13 first passes through the longitudinal air distribution section, then through the transverse air distribution section, and finally reaches the inside of the drum. The air distribution device 15 consists of several openable air distribution plates. The openings between the opening and closing plates in the transverse air distribution section are parallel to the drum shaft, while the openings between the opening and closing plates in the longitudinal air distribution section are perpendicular to the drum shaft.

[0018] During cooling, rubber granules are fed into cooling device 1, and air is supplied perpendicularly to the material conveying channel of cooling device 1 to cool the rubber granules. Processing is completed when the temperature of the rubber granules drops below 50℃, and the material is output through outlet 123. The air supply temperature and airflow strength of the four cooling zones can be adjusted independently. Air supply can be set according to actual conditions when cooling materials. For example, if the material temperature near inlet 122 is higher than that near outlet 123, the air supply temperature in the cooling zone near inlet 122 can be higher than that in the cooling zone near outlet 123. Excessive cooling of the air supply is unnecessary, achieving stepped cooling to prevent excessive temperature differences due to low air supply temperature at inlet 122 and high material temperature affecting processing quality, while also achieving energy saving and consumption reduction. Furthermore, in traditional cooling devices, air is delivered along the axial direction of the cooling drum 12. If the air blows from the inlet 122 to the outlet 123, the air temperature gradually increases after passing through the material, and the cooling effect gradually decreases. If the air enters from the outlet 123 and exits from the inlet 122, the air temperature will also gradually increase and change, making it impossible to precisely control the temperature at the inlet 122. Moreover, if air delivery along the axial direction of the cooling drum 1 fails to meet the cooling standard, the equipment length often needs to be increased. However, changing the airflow force affects the material's movement trajectory within the cooling drum, potentially causing lateral movement; therefore, cooling cannot be achieved simply by adjusting the airflow force. Air delivery perpendicular to the cooling drum's axial direction increases the material's vertical suspension time, which is beneficial for better cooling. It also allows for the connection of the air inlets 13 and exhaust outlets 14 in each cooling zone, with the return air mixed with the incoming air for cooling.

[0019] 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 drum cooling device for wet-process rubber granules, characterized in that, include: The cooling device (1) comprises a housing (11), a cooling drum (12), a feed inlet (122), and a discharge outlet (123). The cooling drum (12) is rotatably disposed inside the housing (11). The feed inlet (122) and the discharge outlet (123) are located at both ends of the cooling drum (12), with the feed inlet (122) being horizontally higher than the discharge outlet (123). The cooling drum (12) has several mesh openings on its wall. An air inlet (13) is provided on the housing (11) below the cooling drum (12), and an exhaust outlet (14) is provided on the housing (11) above the cooling drum (12). When the cooling device (1) is in use, the cooling drum (12) rotates to feed material. Air enters from the air inlet (13), passes through the cooling drum (12), and exits from the exhaust outlet (14) to cool the material in the cooling drum (12). The outer surface of the cooling drum (12) has circumferential baffles (125) evenly distributed along the axis of the drum. The plane of the circumferential baffles (125) is perpendicular to the axis of the drum. The circumferential baffles (125) are close to but do not contact the shell (11). The circumferential baffles (125) divide the cooling drum (12) into multiple cooling zones. Each cooling zone has an air inlet (13) and an air outlet (14) independently opened on the shell (11) below and above it, respectively. The air inlet (13) and the air outlet (14) are positioned towards the side where the material distribution is greater when the cooling drum (12) rotates; Each air inlet (13) is connected to a supply fan, and each air outlet (14) is connected to an exhaust fan; the air temperature and air velocity within the air supply area formed by each air inlet (13) and exhaust outlet (14) can be adjusted independently; Each of the air inlets (13) connected to the air supply fan and each of the air outlets (14) connected to the air exhaust fan is equipped with an air distribution device (15); The air distribution device (15) includes a transverse air distribution section and a longitudinal air distribution section; the air outlet of the transverse air distribution section is parallel to the axial direction of the cooling drum (12), and the air outlet of the longitudinal air distribution section is perpendicular to the axial direction of the cooling drum (12); the transverse air distribution section is close to the cooling drum (12), and the longitudinal air distribution section is close to the housing (11); the air from the air inlet (13) first passes through the longitudinal air distribution section and then through the transverse air distribution section before reaching the inside of the drum.

2. The drum cooling device for wet-process compounded rubber granules as described in claim 1, characterized in that: The outer surface of the cooling drum (12) is evenly distributed with axial partitions (124) along the cylinder axis. The axial partitions (124) are extended with sealing strips. The inner wall of the housing (11) is arc-shaped. The sealing strips are in contact with the inner wall of the housing (11) and each arc segment of the inner wall of the housing (11) contacts at least two sealing strips at the same time. The sealing strips allow a dynamic seal to be formed between the cooling drum (12) and the housing (11).

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