A plastic particle anti-blocking vibrating screening device

Abstract

The utility model provides a kind of plastic particle anti-adhesion vibrating screening device, belong to plastic particle production equipment technical field.The device includes rack, and vibrating screening hopper is arranged on the rack;The bottom of vibrating screening hopper is provided with screening net, and a plurality of screening zones are provided on the screening net, and different mesh numbers of screening holes are provided on each screening zone.The top of screening hopper is provided with air equalizing plate, and the bottom of air equalizing plate is provided with air outlet, and the air outlet is arranged towards the screening net;Air supply system is further provided on the rack, and cold air outlet is provided in the air supply system, and the cold air outlet is communicated with the air inlet on the air equalizing plate.The device can reduce the adhesion in the process of plastic particle screening, so as to improve the screening efficiency of plastic particle and reduce the screening cost.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic pellet production equipment, and in particular to a vibrating screening device for preventing plastic pellets from sticking together. Background Technology

[0002] In the plastic product manufacturing and processing industry, plastic granules are a core raw material, and their particle size uniformity directly affects the product quality of subsequent molding processes such as injection molding and extrusion. Therefore, screening is an indispensable and crucial link in the plastic granule production process. Traditional plastic granule vibrating screening devices mainly rely on a single vibration force to drive the screen surface movement to achieve the grading and separation of plastic granules. However, in actual operation, they are easily affected by the physical characteristics of the plastic granules themselves and the working environment, resulting in serious adhesion problems. On the one hand, plastic granules retain a certain amount of processing heat during production. If the screening device lacks an effective cooling mechanism, the surface of the plastic granules at high temperatures is easily softened, causing the particles to adhere to each other and form lumpy agglomerates. This not only prevents normal grading through the screen but also clogs the screen holes, further reducing screening efficiency. On the other hand, some plastic granules (such as PVC and PE) have a certain degree of viscosity. During the screening process, they are subjected to external forces such as compression and friction, making the adhesion phenomenon more prominent. Especially in high humidity environments, the adhesion problem will be further aggravated, seriously affecting the purity and uniformity of the screened plastic granules.

[0003] To alleviate the adhesion problem, some improvements have emerged in existing technologies, such as using manual periodic cleaning or machine shutdown to reduce adhesion. However, these methods not only increase the labor intensity of operators but also cause production interruptions, reduce overall production efficiency, and cannot meet the needs of continuous production.

[0004] Therefore, it is necessary to improve the existing vibrating screening device for preventing plastic granules from sticking together in order to overcome the shortcomings of the existing technology. Utility Model Content

[0005] To overcome the problems existing in related technologies, the purpose of this utility model is to provide a vibrating screening device for preventing plastic granules from sticking together. This device can reduce the sticking of plastic granules during the screening process, thereby improving the screening efficiency of plastic granules and reducing screening costs.

[0006] A vibrating screening device for preventing plastic granules from sticking together includes a frame, on which a vibrating screening hopper is provided;

[0007] The bottom of the vibrating screening bucket is provided with a screening screen, and the screening screen is provided with several screening sections, each screening section being provided with screening holes of different mesh sizes.

[0008] The top of the screening hopper is provided with an air distribution plate, and the bottom of the air distribution plate is provided with an air outlet, which faces the screening screen. The frame is also provided with an air supply system, and the air supply system is provided with a cold air outlet, which is connected to the air inlet on the air distribution plate.

[0009] In a preferred embodiment of this utility model, the air distribution plate includes a plate body, an air collection chamber is provided in the plate body, a plurality of air outlets are provided at the bottom of the plate body, and an air inlet is provided on the plate body, the air inlet being connected to the air collection chamber.

[0010] In a preferred embodiment of this invention, the cold air outlet is located on one side of the air distribution plate;

[0011] On the air distribution plate, the diameter of the air outlet gradually increases along the direction from near the cold air outlet to away from the cold air outlet;

[0012] On the sieve, the diameter of the sieve holes near the cold air outlet is larger than the diameter of the sieve holes away from the cold air outlet.

[0013] In a preferred embodiment of this invention, a feed inlet is provided on one side of the vibrating screen hopper, and a vibrating motor is provided on the top of the vibrating screen hopper.

[0014] In a preferred embodiment of this utility model, the top of the frame is provided with a plurality of mounting seats, and each mounting seat is provided with a mounting sleeve;

[0015] The outer wall of the vibrating screen bucket is provided with a connecting shaft, which is sleeved on the mounting sleeve.

[0016] In a preferred embodiment of this invention, an elastic element is provided at the bottom of the mounting base, and the top of the elastic element is fixedly connected to the mounting base and the top of the elastic element is fixedly connected to the frame.

[0017] In a preferred embodiment of this invention, a receiving trough is provided on the frame, and the receiving trough is located below the screening screen; the receiving trough is provided with a plurality of receiving trays, and each receiving tray corresponds to one of the screening sections.

[0018] In a preferred embodiment of this invention, the gas supply system includes a refrigeration structure, a drive structure, and a gas outlet. The refrigeration structure is located at the bottom of the frame, the drive structure is located on one side of the refrigeration structure, and the gas outlet is connected to the refrigeration structure via a connecting pipe. The drive structure is located on the connecting pipe and is used to deliver the cold air generated by the refrigeration structure to the gas outlet. The gas outlet is provided with a cold air outlet.

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

[0020] This utility model provides a vibrating sieving device for preventing plastic granules from sticking together. The device includes a frame, on which a vibrating sieving hopper is mounted. A sieving screen is mounted at the bottom of the hopper, and the sieving screen has several sieving sections, each with sieving holes of different mesh sizes. A uniform air distribution plate is mounted at the top of the hopper, and air outlets are located at the bottom of the plate, facing the sieving screen. An air supply system is also mounted on the frame, and a cold air outlet is provided in the system, which is connected to an air inlet on the uniform air distribution plate. In use, the air supply system delivers cold air to the uniform air distribution plate through a guide pipe. The cold air is then evenly dispersed by the air outlets, forming a low-temperature airflow layer covering all sieving sections within the vibrating sieving hopper. The vibration of the vibrating screen bucket causes the plastic granules to move along the length of the screen surface under vibration. The granules come into full contact with the low-temperature airflow layer, causing a rapid drop in surface temperature and preventing them from sticking together due to softening at high temperatures. Simultaneously, the airflow disperses slightly sticky granules, preventing agglomeration. The plastic granules are screened in different screening zones during the vibration of the vibrating screen bucket, and the entire screening process is continuous, requiring no downtime for cleaning. The device provides a low-temperature airflow through an air supply system, which is evenly distributed throughout the entire area via the gradually changing aperture of the air distribution plate. This ensures full contact between the plastic granules and the airflow during screening: on the one hand, it quickly removes residual processing heat from the surface of the granules, preventing softening and sticking due to high temperatures; on the other hand, the dispersing force generated by the airflow breaks up slightly sticky granules, preventing the formation of lumpy agglomerates, thus helping to ensure the uniformity of the screened plastic granules and effectively guaranteeing the product quality of subsequent molding processes. Attached Figure Description

[0021] Figure 1 This is a perspective view of the plastic granule anti-sticking vibrating screening device provided in the embodiments of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 This is a schematic diagram of the screening screen provided in the embodiment of this utility model being installed in the screening hopper;

[0024] Figure 4 This is a schematic diagram of a portion of the structure of the wind distribution plate provided in an embodiment of this utility model.

[0025] Figure label:

[0026] 1. Frame; 11. Material receiving trough; 12. Mounting base; 121. Mounting sleeve; 2. Air supply system; 21. Refrigeration structure; 22. Drive structure; 23. Air outlet; 231. Cold air outlet; 24. Connecting pipe; 3. Screening hopper; 31. Feed inlet; 32. Connecting shaft; 33. Screening screen; 4. Vibrating motor; 5. Air distribution plate; 51. Air collection chamber; 52. Air inlet; 53. Air outlet. Detailed Implementation

[0027] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0028] Traditional vibrating screens for plastic granules rely on a single vibration force to drive the screen surface and achieve granule grading and separation. However, in actual operation, they are susceptible to severe adhesion problems due to the physical properties of the plastic granules themselves and the working environment. On the one hand, plastic granules retain a certain amount of processing heat during production. If the screening device lacks an effective cooling mechanism, the surface of the plastic granules at high temperatures softens, causing the particles to adhere to each other and form lumpy agglomerates. These agglomerates not only cannot pass through the screen for normal grading but also clog the screen holes, further reducing screening efficiency. On the other hand, some plastic granules (such as PVC and PE) have a certain degree of viscosity. During screening, they are subjected to external forces such as compression and friction, making the adhesion phenomenon more prominent. Especially in high-humidity working environments, the adhesion problem is further aggravated, seriously affecting the purity and uniformity of the screened plastic granules.

[0029] To alleviate the adhesion problem, some improvements have emerged in existing technologies, such as using manual periodic cleaning or machine shutdown to reduce adhesion. However, these methods not only increase the labor intensity of operators but also cause production interruptions, reduce overall production efficiency, and cannot meet the needs of continuous production.

[0030] Based on this, this application provides a vibrating screening device for preventing plastic granules from sticking together.

[0031] Example

[0032] Example

[0033] See Figures 1-4 The embodiment provides a vibrating screening device for preventing plastic granules from sticking together, including a frame 1, on which a vibrating screening bucket 3 is provided;

[0034] The bottom of the vibrating screening bucket 3 is provided with a screening screen 33, and the screening screen 33 is provided with a number of screening sections, and each screening section is provided with screening holes of different mesh sizes.

[0035] The top of the screening hopper 3 is provided with an air distribution plate 5, and the bottom of the air distribution plate 5 is provided with an air outlet 53, which is oriented toward the screening screen 33; the frame 1 is also provided with an air supply system 2, which is provided with a cold air outlet 231, and the cold air outlet 231 is connected to the air inlet 52 on the air distribution plate 5.

[0036] Specifically, the vibrating screen hopper 3 is made of food-grade PP material to avoid chemical reaction with plastic granules. The vibrating screen hopper 3 is connected to the frame 1 by four sets of manganese steel springs to buffer the high-frequency vibration of the vibrating screen hopper 3.

[0037] The screening mesh 33 is horizontally installed at the bottom of the vibrating screen hopper 3. It is made of stainless steel woven mesh, and its overall size matches the bottom opening of the vibrating screen hopper 3. The screening mesh 33 is divided into 3 independent screening sections along its length, and each screening section is used to screen plastic particles of different sizes.

[0038] The air distribution plate 5 is horizontally fixed to the top of the vibrating screen hopper 3, with a vertical distance of 300mm from the screening mesh 33. The plate is made of ABS plastic and its dimensions match the top opening of the vibrating screen hopper 3. Circular air outlets 53 are evenly distributed at the bottom of the air distribution plate 5. The diameter of the air outlets 53 gradually changes along the direction of the air inlet 52: the diameter of the air outlets 53 near the air inlet 52 is 2mm, the diameter of the air outlets 53 in the middle area (the middle 1 / 3 area of ​​the air distribution plate 5) is 3mm, and the diameter of the air outlets 53 away from the air inlet 52 (the right 1 / 3 area of ​​the air distribution plate 5) is 4mm. The spacing between the air outlets 53 is uniformly 20mm, and there are 120 air outlets 53 in each area, ensuring that the airflow evenly covers all screening sections within the screening hopper 3. A 50mm diameter air inlet 52 is provided in the middle of the left side of the air distribution plate 5. A rubber sealing ring is installed at the air inlet 52 to achieve a sealed connection with the air supply system 2.

[0039] The air supply system 2 is used to provide low-temperature air to the cold air outlet 231, the temperature of which can be slightly lower than room temperature.

[0040] In the aforementioned vibrating screening device for preventing plastic granules from sticking together, the air supply system 2 delivers cold air to the air distribution plate 5 through the air guide pipe. The cold air is then evenly dispersed by the air outlet 53, forming a low-temperature airflow layer covering all screening zones within the vibrating screening hopper 3. The vibration of the vibrating screening hopper 3 causes the plastic granules to move along the length of the screen surface under vibration. The plastic granules come into full contact with the low-temperature airflow layer, and the surface temperature drops rapidly, preventing sticking due to softening at high temperatures. Simultaneously, the airflow disperses slightly sticky plastic granules, preventing the formation of agglomerates. The plastic granules are screened in different screening zones as the vibrating screening hopper 3 vibrates. The entire screening process is continuous and requires no downtime for cleaning. The device provides a low-temperature airflow through the air supply system 2, which is uniformly distributed throughout the entire area through the gradually changing aperture air outlets 53 of the air distribution plate 5. This ensures that the plastic granules are in full contact with the airflow during the screening process. On the one hand, it quickly removes the residual processing heat on the surface of the plastic granules, preventing the granules from softening and sticking together due to high temperature. On the other hand, the dispersing force generated by the airflow can break up the slightly sticky granules, preventing the formation of lumpy agglomerates. This helps to ensure the uniformity of the plastic granules after screening, thereby effectively guaranteeing the product quality of subsequent molding processes.

[0041] In one embodiment, the air distribution plate 5 includes a plate body, an air collection chamber 51 is provided in the plate body, a plurality of air outlets 53 are provided at the bottom of the plate body, and an air inlet 52 is provided on the plate body, the air inlet 52 being connected to the air collection chamber 51.

[0042] Furthermore, the cold air outlet 231 is located on one side of the air distribution plate 5;

[0043] On the air distribution plate 5, along the direction from near the cold air outlet 231 to away from the cold air outlet 231, the diameter of the air outlet 53 gradually increases;

[0044] On the sieve 33, the diameter of the sieve holes near the cold air outlet 231 is larger than the diameter of the sieve holes away from the cold air outlet 231.

[0045] The air collection chamber 51 inside the plate acts as an "intermediate carrier" for airflow buffering and distribution. The cold air supplied by the air supply system 2 first enters the air collection chamber 51, forming a stable and uniform pressure field within the chamber, and then diffuses into the screening hopper 3 through the bottom air outlet 53. Compared to a direct air intake structure without an air collection chamber 51 (where the airflow easily travels directly along the air inlet 52 to a local area), the air collection chamber 51 effectively counteracts the "airflow impact effect" at the air inlet 52, preventing the cold air from being excessively concentrated on the side near the air inlet 52 and the pressure from the side farther away from the air inlet 52 from being insufficient. Moreover, when the cold air flows from the air collection chamber 51 to the air outlet 53, due to the airflow resistance along the path, the airflow pressure and velocity on the side near the cold air outlet 231 (the initial end of the airflow) are higher than on the side farther away from the air outlet 231 (the end of the airflow). By using a gradient design with smaller apertures near the end and larger apertures far from the end, the airflow resistance can be adjusted by utilizing the aperture difference: smaller apertures near the end (e.g., 2mm) increase local resistance and reduce airflow output; larger apertures far from the end (e.g., 4mm) reduce local resistance and increase airflow output. Ultimately, this keeps the airflow velocity deviation in all areas of the screen surface within a small range, avoiding the problem of plastic particles being excessively blown away on the side near the cold air outlet 231 and sticking together on the side far from the outlet due to insufficient airflow.

[0046] In one embodiment, a feed inlet 31 is provided on one side of the vibrating screen hopper 3, and a vibrating motor 4 is provided on the top of the vibrating screen hopper 3. The feed inlet 31 on one side of the vibrating screen hopper 3 can realize the directional and precise feeding of plastic granules.

[0047] The vibrating motor 4, located at the top of the vibrating hopper 3, serves as the core power source. In practical applications, the vibrating motor 4 generates periodic excitation force through the high-speed rotation of the eccentric block, driving the hopper 3 to vibrate at high frequency. If a YZU-10-4 type vibrating motor 4 (power 0.75kW, speed 1450r / min) is selected, the hopper 3 can generate a composite vibration trajectory of horizontal circular + vertical elliptical. Compared with the traditional single vibration mode, this trajectory can extend the movement path of plastic particles on the screen surface, increase the contact probability between particles and the screen, and allow small-diameter particles to pass through the screen fully.

[0048] Furthermore, the top of the frame 1 is provided with a plurality of mounting seats 12, and each mounting seat 12 is provided with a mounting sleeve 121;

[0049] The outer wall of the vibrating screening hopper 3 is provided with a connecting shaft 32, which is sleeved on the mounting sleeve 121. The cooperation between the mounting sleeve 121 and the connecting shaft 32 enables the vibrating screening hopper 3 to vibrate effectively under the vibration of the vibrating motor 4, thereby realizing the vibration screening of plastic particles.

[0050] Furthermore, the bottom of the mounting base 12 is provided with an elastic element, the top of the elastic element is fixedly connected to the mounting base 12, and the top is fixedly connected to the frame 1.

[0051] The elastic element at the bottom of the mounting base 12 effectively buffers the high-frequency vibration energy transmitted from the vibrating screen bucket 3 to the frame 1. This prevents the frame 1 from shaking or parts from loosening due to excessive vibration, ensuring long-term stable operation of the equipment, extending the service life of the frame 1 and its components, and reducing the frequency and cost of equipment maintenance. In addition, the vibration damping effect reduces the noise generated during equipment operation, improving the working environment.

[0052] Furthermore, a receiving trough 11 is provided on the frame 1, and the receiving trough 11 is located below the screening screen 33; a plurality of receiving trays are provided in the receiving trough 11, and each receiving tray corresponds to one of the screening sections.

[0053] The material trough can fully collect the plastic granules falling after screening, preventing material from scattering on the ground and causing waste and environmental pollution. The receiving trough 11 is further equipped with multiple receiving trays corresponding to the screening sections, enabling precise classification and collection of plastic granules of different sizes based on the mesh size differences of the screening sections. The precise correspondence between the receiving trays and the screening sections eliminates the need for manual secondary sorting during material collection; the plastic granules in each receiving tray can be directly transferred to the next process by automated conveying equipment, reducing manual intervention and lowering labor costs.

[0054] Furthermore, the gas supply system 2 includes a refrigeration structure 21, a drive structure 22, and a gas outlet 23. The refrigeration structure 21 is located at the bottom of the frame 1, the drive structure 22 is located on one side of the refrigeration structure 21, the gas outlet 23 is connected to the refrigeration structure 21 through a connecting pipe 24, and the drive structure 22 is located on the connecting pipe 24 for delivering the cold air generated by the refrigeration structure 21 to the gas outlet 23. The gas outlet 23 is provided with a cold air outlet 231.

[0055] The cooling structure 21 at the bottom of the air supply system 2 can rapidly cool the ambient air to a suitable temperature (e.g., 20-25℃), providing a stable low-temperature airflow for the screening process. This effectively reduces the surface temperature of the plastic granules and prevents them from softening and sticking together due to high temperatures. The cooling structure 21 can be an air-cooled cooling structure with a cooling capacity of 5-8kW. It can quickly reduce the temperature of the air entering the air supply system 2 from 30-35℃ to around 20℃. This has a significant anti-sticking effect on easily sticking plastic granules such as PVC and PE, reducing the sticking rate from over 30% to below 5%, ensuring the uniformity and purity of the plastic granules after screening.

[0056] The drive structure 22 (such as an air compressor) is located on one side of the refrigeration structure 21. Together with the connecting pipe 24 and the air outlet 23, it can stably and efficiently deliver the cooled air to the air distribution plate 5.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vibrating screening device for preventing plastic granules from sticking together, comprising a frame (1), wherein a vibrating screening bucket (3) is provided on the frame (1), characterized in that: The bottom of the vibrating screening bucket (3) is provided with a screening screen (33), and the screening screen (33) is provided with a number of screening sections, and each screening section is provided with screening holes of different mesh sizes. The top of the screening hopper (3) is provided with an air distribution plate (5), and the bottom of the air distribution plate (5) is provided with an air outlet (53), which faces the screening mesh (33). The frame (1) is also provided with an air supply system (2), and the air supply system (2) is provided with a cold air outlet (231), which is connected to the air inlet (52) on the air distribution plate (5).

2. The plastic granule anti-sticking vibrating screening device according to claim 1, characterized in that: The air distribution plate (5) includes a plate body, an air collection chamber (51) is provided in the plate body, a plurality of air outlets (53) are provided at the bottom of the plate body, and an air inlet (52) is provided on the plate body, the air inlet (52) being connected to the air collection chamber (51).

3. The plastic granule anti-sticking vibrating screening device according to claim 2, characterized in that: The cold air outlet (231) is located on one side of the air distribution plate (5); On the air distribution plate (5), along the direction from near the cold air outlet (231) to away from the cold air outlet (231), the diameter of the air outlet (53) gradually increases; On the sieve (33), the aperture of the sieve hole near the cold air outlet (231) is larger than the aperture of the sieve hole away from the cold air outlet (231).

4. The plastic granule anti-sticking vibrating screening device according to any one of claims 1-3, characterized in that: A feed inlet (31) is provided on one side of the vibrating screen bucket (3), and a vibrating motor (4) is provided on the top of the vibrating screen bucket (3).

5. The plastic granule anti-sticking vibrating screening device according to claim 4, characterized in that: The top of the frame (1) is provided with a plurality of mounting seats (12), and each mounting seat (12) is provided with a mounting sleeve (121); The outer wall of the vibrating screen bucket (3) is provided with a connecting shaft (32), which is sleeved on the mounting sleeve (121).

6. The plastic granule anti-sticking vibrating screening device according to claim 5, characterized in that: The bottom of the mounting base (12) is provided with an elastic element, the top of the elastic element is fixedly connected to the mounting base (12), and the top is fixedly connected to the frame (1).

7. The plastic granule anti-sticking vibrating screening device according to any one of claims 1-3, characterized in that: The frame (1) is provided with a receiving trough (11), which is located below the screening screen (33); the receiving trough (11) is provided with a plurality of receiving trays, each receiving tray corresponding to one of the screening sections.

8. The plastic granule anti-sticking vibrating screening device according to any one of claims 1-3, characterized in that: The gas supply system (2) includes a refrigeration structure (21), a drive structure (22), and an outlet (23). The refrigeration structure (21) is located at the bottom of the frame (1). The drive structure (22) is located on one side of the refrigeration structure (21). The outlet (23) is connected to the refrigeration structure (21) through a connecting pipe (24). The drive structure (22) is located on the connecting pipe (24) and is used to deliver the cold air generated by the refrigeration structure (21) to the outlet (23). The outlet (23) is provided with a cold air outlet (231).

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