A pre-dispersed masterbatch cooling tank and its cooling process

Abstract

The present application relates to the technical fields of dispersed mother rubber particle production equipment, and discloses a pre-dispersed mother rubber particle cooling box and a cooling process thereof; the cooling box body is internally rotationally connected with a cooling pipe with a guide piece, a cooling unit composed of a main pipe and an outwardly curved branch pipe is coaxially arranged in the cooling pipe, a gas outlet is arranged on the pipe wall, a turbulence box with a cooling nozzle and a turbulence plate is connected to the end of the branch pipe, a first conveying mechanism is inserted into the cooling pipe and close to the inner wall to realize low-level feeding, and a plurality of groups of dust removal pipes alternately composed of conveying pipes and Venturi pipes are further arranged in the cooling pipe; the present application throws up the particles by rotating the cooling pipe in cooperation with the guide piece to increase the heat exchange area and prevent adhesion; the branch pipe concentrates on rapid cooling and shaping, and the main pipe continuously keeps the temperature uniform; the turbulence box pre-cools and avoids direct airflow; the Venturi pipe uses airflow negative pressure to absorb dust without needing an independent air source; the overall structure is compact, low-level feeding is realized, and the occupied space is small.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for producing dispersed masterbatch, specifically to a pre-dispersed masterbatch cooling box and its cooling process. Background Technology

[0002] Predispersed masterbatch granules are granular pre-dispersions produced by using polymers (such as EPDM, SBR, NBR, EVA, etc.) as carriers, adding rubber additives and softeners, and through processes such as mixing, kneading, extrusion, and granulation. The predispersed masterbatch granules discharged after extrusion granulation have a high temperature, typically between 80 and 130°C. The granules are soft and have a high surface viscosity. If they are not cooled promptly and sufficiently, they are prone to sticking together and clumping during transportation and stacking, affecting the product's appearance and subsequent performance. Furthermore, the high-temperature residual heat can cause some heat-sensitive additives to decompose prematurely or undergo pre-crosslinking reactions, further reducing product quality. Therefore, the cooling process after granulation is a crucial step in the continuous production of predispersed masterbatch granules.

[0003] Currently, the common cooling method in the industry is to spread the granulated pre-dispersed masterbatch granules flat on a single-layer conveyor belt, and arrange several fans or cooling ducts on both sides or above the conveyor belt to cool them down by blowing cold air. In order to allow the granules to obtain sufficient residence and cooling time on the conveyor belt, the conveyor belt has to be spliced ​​and lengthened, resulting in the entire cooling line extending tens of meters horizontally, occupying too much factory space and having low space utilization.

[0004] To alleviate the problem of long-distance conveyor belts occupying a large amount of space, some solutions adopt multi-layered conveyor belt cooling structures. For example, Chinese utility model patent CN210190533U discloses a pre-dispersed masterbatch cooling box, in which a first conveyor belt and a second conveyor belt are arranged vertically inside the box. By utilizing the folding path of the upper and lower conveyor belts, the material conveying distance is extended within the limited length of the box, reducing the horizontal footprint. However, this type of multi-layered conveyor belt arrangement has the following drawbacks: the feed inlet is located at the top of the conveyor belt, and the material must enter from the top. Therefore, the discharge port of the granulation equipment needs to be erected at a higher position, or additional auxiliary feeding equipment such as elevators and inclined conveyor belts need to be configured to lift the granules to the top of the conveyor belt. This increases the system's height space requirements, equipment investment, and operation and maintenance costs, and also causes inconvenience for the connection and modification of existing production lines. If the entire granulation equipment is raised, higher requirements are placed on the equipment foundation, factory floor height, and operational safety, which is difficult to implement in many small and medium-sized or existing factories.

[0005] Besides the issues of space occupation and loading height, existing conveyor belt cooling methods also suffer from common problems in terms of cooling efficiency and effectiveness. The masterbatch granule layer laid flat on the conveyor belt remains stationary, limiting the contact area between the granules and the cold air, resulting in low heat exchange efficiency. Granules in the middle and bottom of the layer have difficulty making sufficient contact with the cold air, leading to uneven cooling. Although the surface has cooled, residual heat remains inside, easily causing "reheating" and adhesion during subsequent packaging and storage. Therefore, a pre-dispersed masterbatch cooling box and its cooling process are proposed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a pre-dispersed masterbatch cooling box and its cooling process to solve the problems in the background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: Firstly, a pre-dispersed masterbatch cooling box, comprising a cooling box body, and further comprising: Rotate the cooling pipe connected to the cooling box body; several guide plates are fixedly installed on the inner wall of the cooling pipe. A drive motor installed on the outer wall of the cooling box and driving the cooling pipes to rotate; A first conveying mechanism and a second conveying mechanism are respectively set at both ends of the cooling box. One end of the first conveying mechanism extends into the interior of the cooling pipe and is arranged close to the inner wall of the cooling pipe to minimize the drop difference of the mother granules falling into the cooling pipe. A cooling unit is installed in the middle of the cooling pipe. The cooling unit includes a main pipe and several branch pipes. The main pipe is connected to an external cooling device and is fixed to the cooling box body in the middle of the cooling pipe by a bracket. The branch pipes are connected to the end of the main pipe near the feed end. Each branch pipe has an outwardly curved structure and is arranged close to the inner wall of the cooling pipe. The main pipe and the branch pipes are provided with multiple air outlets on the outer wall inside the cooling pipe. Multiple sets of dust removal pipes are installed inside the cooling pipe. These dust removal pipes are connected to the main pipe and use pressure difference to perform dust removal operations inside the cooling pipe.

[0008] Preferably, the guide plates are arranged in a spiral or inclined segment along the inner wall of the cooling pipe to throw up and transport the masterbatch particles forward when the cooling pipe rotates.

[0009] Preferably, the cooling unit further includes a baffle box, which is fixedly connected to the ends of the plurality of branch pipes and communicates with each branch pipe, and is fixed to the cooling box body by a bracket; the baffle box is located directly above the first conveying mechanism, and the lower end face of the baffle box is provided with a plurality of cooling nozzles.

[0010] Preferably, the inside of the spoiler box is fixedly connected to several spoiler plates, and exhaust nozzles are provided on the side wall of the spoiler box.

[0011] Preferably, each set of dust removal pipes is composed of multiple conveying pipes and multiple venturi tubes connected alternately, and the throat section of the venturi tubes is provided with several air extraction ports; the air inlet end of the dust removal pipe is connected to the main pipe, and the air outlet end of the dust removal pipe is combined and connected with the air outlet ends of other dust removal pipes for unified recycling of collected dust.

[0012] Preferably, the air extraction ports are evenly spaced along the circumference of the throat section of the Venturi tube, and the axis of each air extraction port is perpendicular to the axis of the Venturi tube.

[0013] Secondly, a pre-dispersed masterbatch cooling process, utilizing the cooling box described in the first aspect, includes the following steps: Step 1: The high-temperature pre-dispersed masterbatch granules after granulation are continuously conveyed by the first conveying mechanism and fall into the feed end of the rotating cooling pipe from a position close to the inner wall of the cooling pipe. Step 2: The drive motor drives the cooling pipe to rotate, and the guide plate repeatedly throws the mother rubber particles up and conveys them forward. At the same time, the external cooling gas is distributed through the main pipe to each branch pipe and sprayed out from the air outlet on the main pipe. The cooling gas sprayed from the branch pipe at the feed end concentrates and rapidly cools the newly fallen masterbatch particles, causing their surface to quickly solidify; the cooling gas sprayed from the outlet on the main pipe continuously cools the masterbatch particles moving towards the discharge end until the masterbatch particles drop to room temperature or below. Step 3: After cooling, the masterbatch granules fall from the end of the cooling pipe onto the second conveying mechanism and are sent to the next process.

[0014] Preferably, in step two, some of the cooling gas enters the turbulence box through the branch pipe, is decelerated by the turbulence plate, and is sprayed downward from the cooling nozzle to pre-cool the mother granules on the first conveying mechanism that have not yet entered the cooling pipe; at the same time, excess gas is discharged from the exhaust nozzle to maintain air pressure balance.

[0015] Preferably, in step two, a portion of the cooling gas is diverted from the main pipe to the dust removal pipe. The gas is accelerated at the throat section of the venturi tube to form a negative pressure, and the dust thrown up in the cooling pipe is sucked in through the exhaust port and mixed with the gas and transported to the end of the dust removal pipe for centralized recycling.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a rotating cooling tube with guide plates to throw up and convey the pre-dispersed masterbatch particles forward. The particles are in a discrete state of repeated throwing and tumbling in the cooling tube, which greatly increases the contact area with the cooling gas, improves the heat exchange efficiency, and can greatly shorten the equipment length under the same cooling capacity. The overall structure is compact, occupies little factory area, and has a high space utilization rate.

[0017] 2. This invention, by coaxially inserting the cooling unit inside the cooling pipe and arranging the main pipe and branch pipes in sections along the axial direction of the cooling pipe, allows the pre-dispersed masterbatch particles that have just entered the cooling pipe to be rapidly cooled by the cooling gas sprayed from the outlet of the branch pipe. The particle surface cools and solidifies quickly to form a solidified layer, effectively preventing the deformation and adhesion of the hot and soft particles due to impact. Subsequently, the cooling gas sprayed from the outlet of the main pipe continuously cools the particles, realizing a staged cooling process of rapid cooling and solidification followed by slow cooling and temperature uniformity. The cooling effect is uniform, and the phenomenon of particle "reheating" and adhesion is eliminated.

[0018] 3. By extending the discharge end of the first conveying mechanism into the cooling pipe and arranging it close to the inner wall of the cooling pipe, the pre-dispersed masterbatch granules after granulation fall into the cooling pipe with a low drop. The feeding height is flush with or close to the discharge port of the existing granulation equipment. There is no need to configure an additional elevator, inclined conveyor belt or raise the entire granulation equipment, which reduces the height space requirements of the system, equipment investment and installation difficulty, and facilitates the connection and transformation of the existing production line.

[0019] 4. By setting up a turbulence box and installing a turbulence plate inside the turbulence box, the cooling gas entering the turbulence box is decelerated and homogenized, and then sprayed downwards through the cooling nozzle onto the particles on the first conveying mechanism. The particles are pre-cooled before entering the cooling pipe, and the gas impact force is controlled to avoid scattering or causing accumulation of unshaped particles, thereby further improving the overall cooling effect and particle quality.

[0020] 5. This invention arranges a dust removal pipe inside the cooling pipe and utilizes the low-pressure zone formed by the acceleration of the cooling gas in the throat section of the Venturi tube to suck in and collect the dust generated during the throwing and conveying process through the air extraction port. There is no need to set up a separate dust removal air source, which reduces equipment investment and operating energy consumption, and also reduces the pollution of the working environment and the impact of dust on product quality.

[0021] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the material outlet structure of the cooling box of the present invention; Figure 3 This refers to the interior of the cooling pipe of the present invention; Figure 4 This is a schematic diagram of the cooling unit and dust removal pipe of the present invention; Figure 5This is a cross-sectional structural diagram of the turbulence box of the present invention; Figure 6 This is a schematic cross-sectional view of the venturi tube of the present invention.

[0023] In the diagram: 1. Cooling box; 2. First conveying mechanism; 3. Second conveying mechanism; 4. Cooling pipe; 5. Drive motor; 6. Guide plate; 7. Cooling unit; 71. Main pipe; 72. Branch pipe; 73. Baffle box; 74. Cooling nozzle; 75. Baffle plate; 76. Exhaust nozzle; 8. Dust removal pipe; 81. Conveying pipe; 82. Venturi tube; 83. Air extraction port; 9. Air outlet. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1-6 The present invention provides a pre-dispersed masterbatch cooling box and its cooling process, which provides a cooling device and method with a compact structure, small footprint, no need for additional lifting and feeding equipment and high cooling efficiency, so as to solve the problem that the existing conveyor belt cooling method has too long a footprint or requires high-level feeding in a multi-layer structure, and realizes the staged cooling of pre-dispersed masterbatch by first rapidly cooling and shaping and then slowly cooling and equalizing the temperature, so as to prevent particles from sticking together and agglomerating, and ensure product quality.

[0026] Example 1: like Figure 1 , Figure 2 and Figure 3As shown, the present invention mainly includes a cooling box 1, in which a rotatably connected cooling pipe 4 is installed. The cooling pipe 4 is rotatably supported within the cooling box 1 by multiple sets of bearing seats. A labyrinth seal is provided between the two ends of the cooling pipe 4 and the cooling box 1. Several guide plates 6 are fixedly installed axially inside the cooling pipe 4, and each guide plate 6 is arranged in a spiral or inclined segment along the inner wall of the cooling pipe 4. A drive motor 5 is installed on the outer wall of the cooling box 1. The drive motor 5 drives the cooling pipe 4 to rotate within the cooling box 1. As one driving method, a drive gear is fixed on the output shaft of the drive motor 5, and a gear ring is fixedly installed on the outer wall of the cooling pipe 4. The output shaft of the drive motor 5 drives the gear to rotate, which in turn drives the cooling pipe 4 to rotate in conjunction with the gear ring. A first conveying mechanism 2 and a second conveying mechanism 3 are respectively installed at both ends of the cooling box 1. The first conveying mechanism 2 and the second conveying mechanism 3 can be conveyor belts or other conveying equipment that can be used to convey masterbatch particles. The pre-dispersed masterbatch granules are positioned inside the cooling pipe 4 and close to its inner wall, allowing them to fall into the cooling pipe 4 with minimal drop. This avoids high-speed impacts between the granules and the pipe wall or existing granules when they fall freely from a height, reducing granule deformation and dust generation. The combined structure supports the cooling pipe 4 via the cooling box 1, and the cooling pipe 4 is driven to rotate by the drive motor 5. After the pre-dispersed masterbatch granules are produced, they are quickly conveyed into the cooling pipe 4 via the first conveying mechanism 2. As the cooling pipe 4 rotates, the guide plates 6 throw the pre-dispersed masterbatch granules up and convey them forward until they fall onto the second conveying mechanism 3. The guide plates 6, during rotation, not only throw the granules up but also push them forward axially, ensuring a uniform and controllable residence time for the granules within the cooling pipe 4. This prevents some granules from remaining too long or being discharged too early, guaranteeing consistent cooling performance.

[0027] like Figures 2-4 As shown, a cooling unit 7 is coaxially inserted inside the cooling pipe 4. The cooling unit 7 includes a main pipe 71 and several branch pipes 72. The main pipe 71 is connected to external cooling equipment, such as a fan cooler or an air conditioner. It is fixedly connected to the cooling box 1 through a bracket, so that the cooling unit 7 is kept stationary inside the rotating cooling pipe 4. Branch pipes 72 are connected to the end of the main pipe 71 near the feed end of the cooling pipe 4. Each branch pipe 72 has an outwardly curved structure and is arranged close to the inner wall of the feed end of the cooling pipe 4. Both the main pipe 71 and the branch pipes 72 have several air outlets 9 on their outer walls inside the cooling pipe 4. These air outlets 9 can be individual openings or individually installed jet nozzles, used to spray cooling gas to cool the pre-dispersed masterbatch particles inside the cooling pipe 4. Specifically, the cooling pipe 4 rotates in conjunction with the guide plate 6 to throw the pre-dispersed masterbatch particles up and convey them forward. External cooling equipment supplies cooling gas to the main pipe 71, which is then conveyed into the branch pipes 72 and ejected through the air outlets 9. There are multiple branch pipes 72, located close to the inner wall of the cooling pipe 4, ensuring that the pre-dispersed masterbatch particles entering the cooling pipe 4 can fully contact the cooling gas, achieving rapid initial cooling and preventing adhesion and deformation due to excessive temperature and impact. The particles are then conveyed to the other end of the cooling pipe 4. At this point, the cooling gas sprayed from the branch pipe 72 has cooled and shaped the particles. Then, the cooling gas sprayed from the outlet 9 outside the main pipe 71 is used for the next cooling step to cool them to room temperature or below room temperature. The cooled pre-dispersed masterbatch particles are thrown out from the cooling pipe 4 and fall onto the second conveying mechanism 3 for conveying to the next process. This invention first uses cooling pipe 4 to lift and transport pre-dispersed masterbatch particles to achieve concentrated and rapid cooling and shaping in the first step, and then uses main pipe 71 to cool them to room temperature or below for shaping in the second step. This makes it less likely for the pre-dispersed masterbatch particles to clump together. At the same time, the pre-dispersed masterbatch particles lifted by cooling have higher efficiency. The overall structure is compact and occupies a small area, making it suitable for use in existing pre-dispersed masterbatch particle granulation production lines.

[0028] Example 2: like Figure 1 , Figure 3 and Figure 4 As shown, the cooling unit 7 also includes a baffle box 73 fixed to the ends of multiple branch pipes 72. The baffle box 73 is connected to the branch pipes 72 and fixed to the cooling box 1 via a bracket. Several baffle plates 75 are fixedly connected to the inner wall of the baffle box 73. Multiple cooling nozzles 74 are provided at the lower end of the baffle box 73, and exhaust nozzles 76 are provided on the side of the baffle box 73. The baffle box 73 is located directly above the first conveying mechanism 2. The cooling gas delivered by the external cooling equipment enters the baffle box 73 after passing through the main pipe 71 and the branch pipes 72. The incoming gas is slowed down by the baffle plate 75, reducing the impact force of the gas. Some of the gas is discharged through the exhaust nozzle 76, while some gas is still discharged through the cooling nozzle 74. This pre-cools the pre-dispersed masterbatch particles conveyed on the first conveying mechanism 2 and controls the impact force of the gas, preventing the pre-dispersed masterbatch particles from shifting and accumulating due to the direct airflow. When the pre-cooled pre-dispersed masterbatch particles enter the cooling pipe 4, their surface has already been initially hardened, making them less likely to stick together due to falling impact, thereby improving the cooling effect of the pre-dispersed masterbatch particles.

[0029] Example 3: like Figure 3 , Figure 4 and Figure 6 As shown, it also includes multiple dust removal pipes 8 installed inside the cooling pipe 4. Each set of dust removal pipes 8 is composed of multiple conveying pipes 81 and multiple venturi pipes 82 connected alternately. The throat section of the venturi pipe 82 is provided with several air extraction ports 83. The air extraction ports 83 are evenly spaced along the circumference of the throat section of the venturi pipe 82, and the axis of each air extraction port 83 is perpendicular to the axis of the venturi pipe 82. The dust removal pipe 8 is connected to the main pipe 71, and the air outlet end is merged with the air outlet ends of other dust removal pipes 8 and connected to the manifold. The end of the manifold is connected to the dust collection device. Cooling gas supplied by external cooling equipment is diverted from main pipe 71 to dust removal pipe 8. The gas enters conveying pipe 81 and venturi pipe 82. The gas is accelerated in the contraction section of venturi pipe 82, reaching the throat with the smallest cross-sectional area, where the flow velocity is the largest and the static pressure is the lowest, forming a low-pressure zone. Thus, dust generated by the surrounding pre-dispersed masterbatch particles due to being thrown up can be extracted through exhaust port 83, improving the quality of pre-dispersed masterbatch particle formation and reducing dust pollution. At the same time, the dust at the end of the combined dust removal pipe 8 can be collected and recovered by a dust collection device, such as a cyclone separator or a bag filter, and the separated dust can be recycled. Meanwhile, the cooling gas in main pipe 71 is diverted to dust removal pipe 8, eliminating the need for a separate gas source and reducing equipment investment and operating costs.

Claims

1. A pre-dispersed masterbatch cooling box, comprising a cooling box body (1), characterized in that, Also includes: Rotate the cooling pipe (4) connected inside the cooling box (1), and a number of guide plates (6) are fixedly installed on the inner wall of the cooling pipe (4); A drive motor (5) installed on the outer wall of the cooling box (1) and driving the cooling pipe (4) to rotate; A first conveying mechanism (2) and a second conveying mechanism (3) are respectively set at both ends of the cooling box (1). One end of the first conveying mechanism (2) extends into the interior of the cooling pipe (4) and is arranged close to the inner wall of the cooling pipe (4) so ​​as to minimize the drop difference of the mother granules falling into the cooling pipe (4). A cooling unit (7) is installed in the middle of the cooling pipe (4). The cooling unit (7) includes a main pipe (71) and several branch pipes (72). The main pipe (71) is connected to the external cooling equipment and fixed to the cooling box (1) in the middle of the cooling pipe (4) through a bracket. The branch pipes (72) are connected to the end of the main pipe (71) near the feed end. Each branch pipe (72) has an outward bending structure and is arranged close to the inner wall of the cooling pipe (4). The main pipe (71) and the branch pipes (72) are provided with multiple air outlets (9) on the outer wall inside the cooling pipe (4). Multiple sets of dust removal pipes (8) are installed inside the cooling pipe (4). The dust removal pipes (8) are connected to the main pipe (71) and use the pressure difference to perform dust removal operations inside the cooling pipe (4).

2. The pre-dispersed masterbatch cooling box according to claim 1, characterized in that, The guide plates (6) are arranged in a spiral or inclined segment along the inner wall of the cooling pipe (4) to throw up the masterbatch particles and transport them forward when the cooling pipe (4) rotates.

3. The pre-dispersed masterbatch cooling box according to claim 1, characterized in that, The cooling unit (7) also includes a baffle box (73), which is fixedly connected to the end of the plurality of branch pipes (72) and communicates with each branch pipe (72), and is fixed to the cooling box (1) by a bracket; the baffle box (73) is located directly above the first conveying mechanism (2), and the lower end face of the baffle box (73) is provided with a plurality of cooling nozzles (74).

4. A pre-dispersed masterbatch cooling box according to claim 3, characterized in that, The inside of the turbulence box (73) is fixedly connected to several turbulence plates (75), and an exhaust nozzle (76) is provided on the side wall of the turbulence box (73).

5. A pre-dispersed masterbatch cooling box according to claim 1, characterized in that, Each set of dust removal pipes (8) is composed of multiple conveying pipes (81) and multiple venturi pipes (82) connected alternately. The throat section of the venturi pipe (82) is provided with several air extraction ports (83). The air inlet of the dust removal pipe (8) is connected to the main pipe (71), and the air outlet of the dust removal pipe (8) is connected to the air outlet of other dust removal pipes (8) for unified recycling of collected dust.

6. A pre-dispersed masterbatch cooling box according to claim 5, characterized in that, The air extraction ports (83) are evenly spaced along the circumference of the throat section of the Venturi tube (82), and the axis of each air extraction port (83) is perpendicular to the axis of the Venturi tube (82).

7. A cooling process for pre-dispersed masterbatch particles, utilizing the cooling tank according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: The high-temperature pre-dispersed masterbatch particles after granulation are continuously conveyed by the first conveying mechanism (2) and fall into the feed end of the rotating cooling pipe (4) from a position close to the inner wall of the cooling pipe (4); Step 2: The drive motor (5) drives the cooling pipe (4) to rotate, and the guide plate (6) repeatedly throws the mother rubber particles up and conveys them forward. At the same time, the external cooling gas is distributed through the main pipe (71) to each branch pipe (72) and the air outlet (9) on the main pipe (71) and sprayed out. Among them, the cooling gas sprayed from the branch pipe (72) at the feed end concentrates and rapidly cools the newly fallen masterbatch particles, so that their surface is quickly shaped; the cooling gas sprayed from the air outlet (9) on the main pipe (71) continuously cools the masterbatch particles moving towards the discharge end until the masterbatch particles drop to room temperature or below. Step 3: The cooled masterbatch particles fall from the end of the cooling pipe (4) onto the second conveying mechanism (3) and are sent to the next process.

8. The pre-dispersed masterbatch cooling process according to claim 7, characterized in that, In step two, some of the cooling gas enters the turbulence box (73) through the branch pipe (72), and after being slowed down by the turbulence plate (75), it is sprayed downward from the cooling nozzle (74) to pre-cool the mother rubber particles on the first conveying mechanism (2) that have not yet entered the cooling pipe (4); at the same time, excess gas is discharged from the exhaust nozzle (76) to maintain the air pressure balance.

9. The pre-dispersed masterbatch cooling process according to claim 7, characterized in that, In step two, some of the cooling gas is diverted from the main pipe (71) to the dust removal pipe (8). The gas is accelerated at the throat section of the venturi tube (82) to form a negative pressure. The dust thrown up in the cooling pipe (4) is sucked in through the air extraction port (83) and mixed with the gas and transported to the end of the dust removal pipe (8) for centralized recycling.

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