A plastic pellet cooling device

Abstract

This utility model relates to the technical field of auxiliary devices for granulation, and more specifically, to a plastic granule cooling device, including a cooling tank, a rotating mechanism, and a conveying screw. A cooling jacket is formed between the inner and outer walls of the cooling tank. The two ends of the cooling jacket are respectively connected to a liquid inlet and a liquid outlet. The cooling tank has a feed inlet and a discharge outlet. The conveying screw is connected to the output end of the rotating mechanism. The radial thickness of the cooling jacket in the middle section along the axial direction is less than the radial thickness at both ends. The radial distance of the material conveying channel gap between the inner wall of the cooling tank and the conveying screw changes in the opposite direction to the radial thickness of the cooling jacket. This utility model improves the cooling effect on plastic granules by accelerating the flow of cooling water in the middle section of the cooling jacket along the axial direction and extending the tumbling time of the material in the middle section, thereby reducing the floor space required.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for pelleting, and more specifically, to a plastic pellet cooling device. Background Technology

[0002] During plastic pelletizing, vibrating flatbeds and vibrating towers are typically used to cool the pellets. However, the cooling effect is generally limited, especially in hot summer weather when the workshop temperature is high and the cooling effect is even worse. To address this issue, workshops reduce the pelletizing speed to decrease the pellet bulk density and slow down the vibration conveyor speed to increase the cooling time and improve the cooling effect of the vibrating equipment. However, this reduces pellet production and increases production costs.

[0003] Existing technology discloses a rapid cooling device for a plastic air-cooled pelletizing machine. The conveying screw adopts a hollow mechanism, and coolant is introduced into the inner cavity of the conveying screw to further cool the plastic pellets, effectively preventing the plastic pellets from sticking together and clogging the pipe. However, in actual production, a sufficiently long cylinder is required to achieve a sufficient cooling effect. This device occupies a large area and has a poor cooling effect in actual production. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing plastic pellet cooling devices, which have a large footprint and poor cooling effect, and to provide a plastic pellet cooling device that improves the cooling effect on plastic pellets while reducing the footprint.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A plastic pellet cooling device is provided, comprising a cooling box, a rotating mechanism, and a conveying screw. A cooling interlayer is formed between the inner and outer walls of the cooling box. An inlet and an outlet are respectively connected to both ends of the cooling interlayer. The cooling box has a feed inlet and a discharge outlet. The rotating mechanism is mounted on the cooling box. The conveying screw is rotatably connected inside the cooling box and connected to the output end of the rotating mechanism. The radial thickness of the cooling interlayer in its middle section along the axial direction is less than the radial thickness at both ends. The radial distance of the material conveying channel gap between the inner wall of the cooling box and the conveying screw varies along the axial direction in the opposite direction to the variation trend of the radial thickness of the cooling interlayer.

[0006] This utility model discloses a plastic granule cooling device. Plastic granules enter the cooling tank through the inlet. A rotating mechanism drives a conveying screw to rotate, transporting the plastic granules from the inlet to the outlet. Simultaneously, cooling water enters the cooling jacket through the liquid inlet and exits through the liquid outlet, cooling the plastic granules transported within the cooling tank. Because the radial thickness of the cooling jacket in the middle section along the axial direction is less than that at both ends, the cooling water flows faster in the middle section, carrying away more heat. Furthermore, the radial distance of the material conveying channel gap between the inner wall of the cooling tank and the conveying screw changes in the opposite direction to the radial thickness of the cooling jacket. That is, the radial distance in the middle section of the material conveying channel gap is greater than that at both ends. This slows down the material's transport speed in the middle section, prolonging the tumbling time of the material there, thus allowing for sufficient cooling in the middle section. By accelerating the flow of cooling water in the middle section along the axial direction of the cooling jacket, and extending the tumbling time of the material in the middle section, the cooling effect on plastic granules is improved while reducing the floor space required.

[0007] Furthermore, the conveying screw includes a constant-diameter rotating rod and helical blades. The constant-diameter rotating rod is rotatably connected to the cooling box and connected to the output end of the rotating mechanism. The helical blades are wound around the constant-diameter rotating rod, and the outer diameter of the middle section of the helical blades along the axial direction is larger than the outer diameters at both ends. By setting the constant-diameter rotating rod, the radial distance of the material conveying channel gap is changed by altering the outer diameter of the helical blades, which facilitates the production of the conveying screw.

[0008] Furthermore, the equal-diameter rotating rod is hollow, and its two ends are respectively connected to an air inlet and an air outlet. Simultaneously with material feeding, the air outlet is connected to a vacuum pump to provide air cooling to the inside of the equal-diameter rotating rod, which, combined with water cooling in the cooling jacket, further cools the material.

[0009] Furthermore, the constant-diameter rotating rod includes an outer tube and an inner tube. The outer tube is rotatably connected to the cooling box and connected to the output end of the rotating mechanism. The spiral blades are wound around the outer tube, and the inner tube is installed inside the outer tube. A cooling gap is formed between the inner tube and the outer tube. One end of the inner tube is provided with a ventilation hole, and the end of the inner tube near the ventilation hole is provided with a connector. The air outlet is located on the connector. The air inlet, the cooling gap, the ventilation hole, and the air outlet are sequentially connected. The connector connects to an air pump, allowing air to enter the cooling gap through the air inlet, then enter the inner tube through the ventilation hole, and finally flow out through the air outlet, thus cooling the material.

[0010] Furthermore, the liquid inlet is located at one end of the cooling jacket near the discharge port, and the liquid outlet is located at one end of the cooling jacket near the feed inlet. This reduces the temperature difference between the cooling water and the material, facilitating better cooling.

[0011] Furthermore, the cooling box is equipped with a storage bin located at the discharge port. The cooled material accumulates in the storage bin and is discharged through the discharge port.

[0012] Furthermore, it also includes a temperature sensor and a controller. The temperature sensor is located at the storage bin, and both the temperature sensor and the rotating mechanism are electrically connected to the controller. The temperature sensor monitors the material temperature at the storage bin, and when the temperature does not match the set temperature, the controller adjusts the rotation speed of the rotating mechanism.

[0013] Furthermore, it also includes a torque sensor, which is connected to the rotating mechanism and electrically connected to the controller. By setting the torque sensor, the torque at the conveying screw is monitored, and the rotation speed of the rotating mechanism is adjusted by the controller according to the torque, facilitating the conveying of materials.

[0014] Furthermore, it also includes a feeding mechanism and a discharging mechanism respectively connected to both ends of the cooling box. The feeding mechanism is connected to the inlet, and the discharging mechanism is connected to the outlet. The feeding mechanism feeds material into the cooling box through the inlet, and the discharging mechanism collects the material that has been cooled in the cooling box.

[0015] Furthermore, the feeding mechanism includes a feeding hopper connected to the cooling box and a feeding conveying pipe installed on the feeding hopper, wherein the feeding conveying pipe, the feeding hopper, and the feeding port are sequentially connected; the discharging mechanism includes a collecting hopper and a discharging conveying pipe and a vacuum feeder installed on the collecting hopper, wherein the discharging conveying pipe is connected to the cooling box, and the discharging port, the discharging conveying pipe, and the collecting hopper are sequentially connected. Material enters the feeding hopper through the feeding conveying pipe and is stored therein. The material in the feeding hopper enters the cooling box through the feeding port. A conveying screw transports the material to the discharging port, and the vacuum feeder transports the cooled material through the discharging conveying pipe to the collecting hopper for collection.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. The present invention relates to a plastic pellet cooling device, which accelerates the flow of cooling water in the middle section along the axial direction of the cooling jacket and prolongs the tumbling time of the material in the middle section, thereby improving the cooling effect of plastic pellets while reducing the floor space required.

[0017] 2. The plastic pellet cooling device of this utility model is made hollow by making the equal diameter rotating rod hollow, and the inside of the equal diameter rotating rod is air-cooled, combined with water cooling of the cooling jacket to further cool the material; at the same time, the use of air cooling combined with water cooling reduces the generation of condensate, avoids increasing the drying and dehumidification process and time in the downstream production process, and avoids problems such as air bubbles generated during extrusion and injection molding.

[0018] 3. The present invention provides a plastic pellet cooling device that monitors the material temperature at the storage bin using a temperature sensor. When the temperature does not match the set temperature, the rotation speed of the rotating mechanism is adjusted by a controller. A torque sensor is installed to monitor the torque at the conveying screw, and the rotation speed of the rotating mechanism is adjusted by the controller based on the torque, which facilitates the conveying of materials. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the plastic pellet cooling device of this utility model; Figure 2 This is a schematic diagram of the conveying screw in this utility model; Figure 3 yes Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 yes Figure 2 Enlarged view of the structure at point B; Figure 5 This is a schematic diagram of the inner tube in this utility model.

[0020] In the attached diagram: 100, cooling box; 110, cooling jacket; 111, liquid inlet; 112, liquid outlet; 120, feed inlet; 130, discharge outlet; 200, rotating mechanism; 300, conveying screw; 310, equal-diameter rotating rod; 311, outer tube; 312, inner tube; 313, air-cooled gap; 314, air inlet; 315, air outlet; 316, ventilation hole; 317, connector; 320, spiral blade; 400, storage box; 500, temperature sensor; 600, torque sensor; 700, feeding mechanism; 710, feeding hopper; 720, feeding conveying pipe; 800, discharge mechanism; 810, collection hopper; 820, discharge conveying pipe; 830, vacuum feeder. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. The present utility model will be further described below with reference to specific embodiments. The accompanying drawings are only for illustrative purposes and represent only schematic diagrams, not actual pictures, and should not be construed as limiting the present patent. In order to better illustrate the embodiments of the present utility model, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, if the embodiments of this utility model involve descriptions such as "first" and "second," these descriptions are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features. In addition, the meaning of "and / or" in the text is that it includes three parallel options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0023] Example 1 This embodiment is a first embodiment of a plastic pellet cooling device, such as... Figure 1As shown, the device includes a cooling box 100, a rotating mechanism 200, and a conveying screw 300. A cooling interlayer 110 is formed between the inner and outer walls of the cooling box 100. The two ends of the cooling interlayer 110 are respectively connected to an inlet 111 and an outlet 112. The cooling box 100 is provided with a feed inlet 120 and a discharge outlet 130. In this embodiment, the cooling box 100 includes a U-shaped box and a cover plate. The cooling interlayer 110 is located inside the U-shaped box. When the coolant flows within the cooling interlayer 110, it can carry away the heat from the granules in contact with the inner wall of the U-shaped box. The cover plate is detachably connected to the top of the U-shaped box and is used to tightly close the U-shaped box. The cover plate is made of transparent plexiglass, allowing easy observation of the interior of the U-shaped box. Removing the cover plate also facilitates cleaning of the U-shaped box. The interior of the box is maintained and cleaned. A rotating mechanism 200 is mounted on the cooling box 100, and a conveying screw 300 is rotatably connected inside the cooling box 100. The conveying screw 300 is connected to the output end of the rotating mechanism 200. The radial thickness of the cooling jacket 110 in the middle section along the axial direction is less than that at both ends, meaning the U-shaped box has a drum-shaped structure. The change in the radial thickness of the cooling jacket 110 accelerates the flow rate of the coolant in the middle section. The radial distance of the material conveying channel gap between the inner wall of the cooling box 100 and the conveying screw 300 changes in the opposite direction to the change in the radial thickness of the cooling jacket 110, meaning the material conveying channel gap in the middle section is larger than that at both ends. This change in the radial distance of the material conveying channel gap prolongs the time the material stays in the middle section. Since the conveying screw 300 is typically composed of a rotating rod and helical blades, the material conveying gap in this embodiment refers to the gap between the outer wall of the rotating rod and the inner wall of the cooling box 100. The change in the radial distance of the material conveying channel gap can be a change in the outer diameter of the rotating rod or a change in the outer diameter of the helical blades. This means that the outer diameter of the middle section of the rotating rod can be smaller than the outer diameters at both ends, or the outer diameter of the middle section of the spiral blade can be larger than the outer diameters at both ends. In this embodiment, the distance between the outer edge of the spiral blade and the inner wall of the cooling box 100 is smaller than the particle size of the granules, to avoid the granules getting stuck during transportation.

[0024] The liquid inlet 111 is located at the end of the cooling jacket 110 near the discharge port 130, and the liquid outlet 112 is located at the end of the cooling jacket 110 near the feed inlet 120. This reduces the temperature difference between the cooling water and the material, facilitating better cooling.

[0025] It also includes a feeding mechanism 700 and a discharging mechanism 800 connected to both ends of the cooling box 100, respectively. The feeding mechanism 700 is connected to the inlet 120, and the discharging mechanism 800 is connected to the outlet 130. The feeding mechanism 700 feeds material into the inlet 120 of the cooling box 100, and the discharging mechanism 800 collects the material that has been cooled in the cooling box 100.

[0026] The feeding mechanism 700 includes a feeding hopper 710 connected to the cooling box 100 and a feeding conveying pipe 720 installed and connected to the feeding hopper 710. The feeding conveying pipe 720, the feeding hopper 710 and the feeding port 120 are connected in sequence. The discharging mechanism 800 includes a collecting hopper 810 and a discharging conveying pipe 820 and a vacuum feeder 830 installed and connected to the collecting hopper 810. The discharging conveying pipe 820 is connected to the cooling box 100. The discharging port 130, the discharging conveying pipe 820 and the collecting hopper 810 are connected in sequence. After the plastic granules are cut from the die head, the vacuum feeder draws the plastic granules from the die head cutting collection box to the feeding hopper 710 through the feeding conveying pipe 720. The material in the feeding hopper 710 enters the cooling box 100 through the feeding port 120. The conveying screw 300 conveys the material to the discharge port 130. The vacuum feeder 830 transports the cooled material to the collection hopper 810 through the discharge conveying pipe 820 for collection. Then, it is packaged into bags according to the weight requirements.

[0027] The working principle of the plastic pellet cooling device in this embodiment is as follows: Plastic granules enter the cooling tank 100 through the inlet 120. The rotating mechanism 200 is activated, driving the conveying screw 300 to rotate. The conveying screw 300 transports the plastic granules from the inlet 120 to the outlet 130. Simultaneously, cooling water enters the cooling jacket 110 through the liquid inlet 111 and exits through the liquid outlet 112, cooling the plastic granules transported within the cooling tank 100. Because the radial thickness of the cooling jacket 110 in the middle section along the axial direction is less than that at both ends, the cooling water flows faster in the middle section of the cooling jacket 110, carrying away more heat. At the same time, the radial distance of the material conveying channel gap between the inner wall of the cooling tank 100 and the conveying screw 300 changes in the opposite direction to the radial thickness of the cooling jacket 110. That is, the radial distance in the middle section of the material conveying channel gap is greater than that at both ends. This slows down the material's transport speed in the middle section, prolonging the tumbling time of the material in the middle section, thus allowing for sufficient cooling of the material in the middle section. By accelerating the flow of cooling water in the middle section along the axial direction of the cooling jacket 110, and extending the tumbling time of the material in the middle section, the cooling effect on plastic granules is improved while reducing the floor space required.

[0028] Example 2 This embodiment is the second embodiment of the plastic pellet cooling device. This embodiment is similar to the first embodiment, except that, as shown in the following... Figure 2As shown, the conveying screw 300 includes a constant-diameter rotating rod 310 and a helical blade 320. The constant-diameter rotating rod 310 is rotatably connected to the cooling box 100 and is connected to the output end of the rotating mechanism 200. The helical blade 320 is wound around the constant-diameter rotating rod 310. The outer diameter of the middle section of the helical blade 320 along the axial direction is larger than the outer diameters at both ends. The material conveying channel gap is divided into a feeding section, a first transition section, a mixing section, a second transition section, and a discharge section from the inlet 120 to the outlet 130. In this embodiment, the mixing section... The outer diameter and pitch of the spiral blades 320 in the material feeding section are constant, but the outer diameter and pitch are the largest in the entire section. The outer diameter and pitch of the spiral blades 320 in the feeding and discharging sections remain unchanged. In the first transition section, the outer diameter of the spiral blades 320 gradually increases from the outer diameter in the feeding section to the outer diameter in the mixing section, with a transition angle not exceeding 45° and a constant pitch. In the second transition section, the outer diameter of the spiral blades 320 gradually decreases from the outer diameter in the mixing section to the outer diameter in the discharging section, with a transition angle not exceeding 45° and a constant pitch. By setting a constant-diameter rotating rod 310, the radial distance of the material conveying channel gap is changed by altering the outer diameter of the spiral blades 320, facilitating the production of the conveying screw 300.

[0029] like Figure 3 and Figure 4 As shown, the equal-diameter rotating rod 310 is hollow, with an air inlet 314 and an air outlet 315 connected to its two ends. Simultaneously with material feeding, the air outlet 315 is connected to a vacuum pump to provide air cooling to the interior of the equal-diameter rotating rod 310. Combined with water cooling in the cooling jacket 110, this further cools the material, achieving more efficient heat dissipation for the same box length through a dual cooling system.

[0030] like Figures 2 to 4 As shown, the constant-diameter rotating rod 310 includes an outer tube 311 and an inner tube 312. The outer tube 311 is rotatably connected to the cooling box 100. The outer tube 311 is formed by a hollow metal cylinder. The outer tube 311 is connected to the output end of the rotating mechanism 200. A spiral blade 320 is wound around the outer tube 311. The inner tube 312 is installed and connected inside the outer tube 311. The inner tube 312 is a hollow metal tube. A cooling gap 313 is formed between the inner tube 312 and the outer tube 311. Figure 5 As shown, one end of the inner tube 312 is provided with a ventilation hole 316, which is a through hole. The end of the inner tube 312 near the ventilation hole 316 is provided with a connector 317, and an air outlet 315 is provided on the connector 317. The air inlet 314, the air-cooling gap 313, the ventilation hole 316, and the air outlet 315 are connected in sequence. The air is connected to the air pump through the connector 317, allowing air to enter the air-cooling gap 313 through the air inlet 314, then enter the inner tube 312 through the ventilation hole 316, and then flow out through the air outlet 315, cooling the inner wall of the outer tube 311. When the granules come into contact with the tube wall, the heat on the surface of the granules can be carried away, thus cooling the material.

[0031] Specifically, a connecting plate is connected to the end of the inner tube 312 near the rotating mechanism 200. The connecting plate is welded and fixed to the inner wall of the outer tube 311. The connecting plate seals the end of the inner tube 312 and connects the inner tube 312 to the outer tube 311. The air inlet 314 is located on the connecting plate. A support ring is connected to the end of the inner tube 312 away from the rotating mechanism 200. The outer ring of the support ring is welded to the inner wall of the outer tube 311, and the inner ring of the support ring is welded to the outer wall of the inner tube 312. A bearing is provided between the outer tube 311 and the cooling box 100, allowing the outer tube 311 to rotate inside the cooling box 100. The rotating mechanism 200 includes a variable frequency motor and a reduction gearbox. The reduction gearbox is located on the cooling box 100. The output end of the variable frequency motor is connected to the reduction gearbox, and the output end of the reduction gearbox is connected to the outer tube 311.

[0032] Example 3 This embodiment is the third embodiment of the plastic pellet cooling device. This embodiment is similar to Embodiment 1, except that, as shown in the following... Figure 1 As shown, the cooling box 100 is equipped with a storage box 400, which is located at the discharge port 130. The cooled material accumulates in the storage box 400 and is discharged through the discharge port 130.

[0033] It also includes a temperature sensor 500 and a controller. The temperature sensor 500 is located at the storage bin 400, and both the temperature sensor 500 and the rotating mechanism 200 are electrically connected to the controller. The temperature sensor 500 monitors the material temperature at the storage bin 400. When the temperature does not match the set temperature, the controller adjusts the rotation speed of the rotating mechanism 200.

[0034] It also includes a torque sensor 600, which is connected to the rotating mechanism 200. Specifically, the torque sensor 600 is located inside the gearbox and is electrically connected to the controller. By setting the torque sensor 600, the torque at the conveying screw 300 is monitored, and the rotation speed of the rotating mechanism 200 is adjusted according to the torque through the controller, which facilitates the conveying of materials.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A plastic pellet cooling device, comprising a cooling tank (100), a rotating mechanism (200), and a conveying screw (300), wherein a cooling interlayer (110) is formed between the inner and outer walls of the cooling tank (100), and the two ends of the cooling interlayer (110) are respectively connected to an inlet (111) and an outlet (112), the cooling tank (100) is provided with a feed inlet (120) and a discharge outlet (130), the rotating mechanism (200) is disposed on the cooling tank (100), the conveying screw (300) is rotatably connected to the inside of the cooling tank (100), and the conveying screw (300) is connected to the output end of the rotating mechanism (200); characterized in that, The radial thickness of the cooling jacket (110) in the middle section along the axial direction is less than that at both ends. The radial distance of the material conveying channel gap between the inner wall of the cooling box (100) and the conveying screw (300) along the axial direction changes in the opposite direction to the radial thickness of the cooling jacket (110).

2. The plastic pellet cooling device according to claim 1, wherein The conveying screw (300) includes a constant diameter rotating rod (310) and a helical blade (320). The constant diameter rotating rod (310) is rotatably connected to the cooling box (100). The constant diameter rotating rod (310) is connected to the output end of the rotating mechanism (200). The helical blade (320) is wound around the constant diameter rotating rod (310). The outer diameter of the middle section of the helical blade (320) along the axial direction is greater than the outer diameter of both ends.

3. The plastic pellet cooling device according to claim 2, wherein The equal-diameter rotating rod (310) is hollow, and the two ends inside the equal-diameter rotating rod (310) are respectively connected to the air inlet (314) and the air outlet (315).

4. The plastic pellet cooling device according to claim 3, wherein The equal-diameter rotating rod (310) includes an outer tube (311) and an inner tube (312). The outer tube (311) is rotatably connected to the cooling box (100). The outer tube (311) is connected to the output end of the rotating mechanism (200). The spiral blade (320) is wound around the outer tube (311). The inner tube (312) is installed inside the outer tube (311). A wind-cooling gap (313) is formed between the inner tube (312) and the outer tube (311). One end of the inner tube (312) is provided with a ventilation hole (316). The end of the inner tube (312) near the ventilation hole (316) is provided with a connector (317). The air outlet (315) is provided on the connector (317). The air inlet (314), the wind-cooling gap (313), the ventilation hole (316) and the air outlet (315) are connected in sequence.

5. The plastic pellet cooling device according to any one of claims 1 to 4, characterized in that, The liquid inlet (111) is located at one end of the cooling jacket (110) near the discharge port (130), and the liquid outlet (112) is located at one end of the cooling jacket (110) near the liquid inlet (120).

6. The plastic pellet cooling device according to any one of claims 1 to 4, characterized in that, The cooling box (100) is equipped with a storage box (400), which is located at the discharge port (130).

7. The plastic pellet cooling device according to claim 6, wherein It also includes a temperature sensor (500) and a controller. The temperature sensor (500) is located at the storage bin (400). Both the temperature sensor (500) and the rotating mechanism (200) are electrically connected to the controller.

8. The plastic pellet cooling device according to claim 7, wherein It also includes a torque sensor (600), which is connected to the rotating mechanism (200) and electrically connected to the controller.

9. The plastic pellet cooling device according to any one of claims 1 to 4, characterized in that, It also includes a feeding mechanism (700) and a discharging mechanism (800) respectively connected to both ends of the cooling box (100), the feeding mechanism (700) being connected to the inlet (120) and the discharging mechanism (800) being connected to the outlet (130).

10. The plastic pellet cooling device according to claim 9, characterized in that, The feeding mechanism (700) includes a feeding hopper (710) connected to the cooling box (100) and a feeding conveying pipe (720) installed on the feeding hopper (710). The feeding conveying pipe (720), the feeding hopper (710), and the feeding port (120) are connected in sequence. The discharging mechanism (800) includes a collecting hopper (810) and a discharging conveying pipe (820) and a vacuum feeder (830) installed on the collecting hopper (810). The discharging conveying pipe (820) is connected to the cooling box (100). The discharging port (130), the discharging conveying pipe (820), and the collecting hopper (810) are connected in sequence.

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