Cooling device for shaping plastic particles

Abstract

The invention belongs to the technical field of industrial cooling devices, and particularly relates to a cooling recovery device for plastic particle shaping, which comprises a cooling cavity, an ultrasonic cleaning assembly, a high-pressure air knife assembly, a waste heat recovery module and a cleaning trigger module. The ultrasonic cleaning assembly includes a plurality of ultrasonic transducers. The high-pressure air knife assembly comprises a plurality of high-pressure air knives. The waste heat recovery module communicates with the air outlet end of the high-pressure air knife assembly. According to the cooling and recycling device for shaping the plastic particles, the ultrasonic transducers are arranged in a distributed array mode, the ultrasonic cavitation effect can cover all the areas of the inner wall of a flow channel, and the strong adhesion force between molten particles and the wall of the flow channel is broken; the high-pressure air knives arranged in the 360-degree circumferential direction form spiral airflow, all-directional blowing is conducted along the axis and the circumferential direction of a flow channel, and broken particles are removed without dead corners; the waste heat recovery module recovers the purging airflow of the high-pressure air knife, and the recovered waste heat airflow is supplied back to the air compressor, so that the heating energy consumption of the air compressor can be reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial cooling devices, and particularly relates to a cooling device for shaping plastic particles. Background Technology

[0002] In industrial production processes such as molten material processing and high-temperature fluid cooling, cooling devices are one of the core supporting equipment. The internal flow channels of the cooling chamber continuously circulate high-temperature media or come into contact with molten materials. Some molten particles easily adhere to the inner walls of the flow channels and gradually solidify and adhere, forming particle deposits that are difficult to remove. These deposits reduce the cross-sectional area of ​​the cooling flow channels, increase the resistance to the flow of the cooling medium, and significantly reduce cooling efficiency. Simultaneously, the uneven distribution of these deposits can cause turbulence in the temperature and flow fields within the flow channels, affecting product processing accuracy and even leading to flow channel blockages and equipment downtime.

[0003] In existing technologies, the main method for cleaning particle adhesion in cooling channels is a single air knife cleaning method. Some technologies use high-pressure air knives to blow the channel. However, single air knives have limitations: ① For strongly adhered particles formed by molten residual particles, the impact force of airflow alone cannot break the molecular-level adhesion between the particles and the channel wall, resulting in poor cleaning effect; ② Traditional air knives are mostly unidirectional or localized, making it difficult to achieve 360° full coverage of the channel circumference, leaving cleaning dead zones; ③ The airflow after air knife blowing is directly discharged, and the residual heat carried by the airflow is not recovered, resulting in energy waste. Summary of the Invention

[0004] The purpose of this invention is to provide a cooling device for shaping plastic particles, which aims to solve the technical problems of poor cleaning effect, dead cleaning corners, and energy waste in the existing traditional plastic particle cooling devices.

[0005] To achieve the above objectives, the cooling device for shaping plastic particles provided in this embodiment of the invention includes:

[0006] The cooling chamber has cooling channels inside for the flow of cooling medium.

[0007] An ultrasonic cleaning assembly includes multiple ultrasonic transducers distributed on the inner wall of a cooling channel to remove particle adhesions adhering to the cooling channel wall through ultrasonic cavitation effect.

[0008] The high-pressure air knife assembly includes several high-pressure air knives, which are evenly arranged 360° around the circumference of the cooling channel. The air outlets of the high-pressure air knives are adapted to form a spiral airflow to purge the cooling channel.

[0009] Waste heat recovery module, which is connected to the air outlet of high-pressure air knife assembly, is used to recover the airflow discharged from high-pressure air knife assembly;

[0010] The cleaning trigger module is electrically connected to the load detection unit, ultrasonic cleaning component, and high-pressure air knife component of the cooling cavity. The cleaning trigger module is configured to automatically start the ultrasonic cleaning component and / or high-pressure air knife component for cleaning when the cooling load of the cooling cavity is at a low load period, and the cleaning process does not interrupt the continuous production of the cooling cavity.

[0011] As an optional embodiment of the present invention, multiple ultrasonic transducers are arranged in an array according to the curvature of the cooling channel, with a spacing of 5-15cm between adjacent ultrasonic transducers, and the ultrasonic emission surface of the ultrasonic transducer is flush with the inner wall of the cooling channel to avoid forming cleaning dead corners.

[0012] As an optional solution of the present invention, the ultrasonic transducer operates at a frequency of 20-40kHz and is equipped with a power adjustment unit with a power adjustment range of 500-2000W to meet the requirements for breaking down residual particles in different viscous molten states.

[0013] As an optional embodiment of the present invention, the outlet of the high-pressure air knife is provided with an oblique cut, the oblique cut being at an angle of 15-45° to the axis of the cooling channel, and the oblique cuts of several high-pressure air knives are oriented in the same direction to form a spiral blowing airflow in coordination.

[0014] As an optional embodiment of the present invention, the high-pressure air knife assembly also includes an air compressor and an airflow regulating valve. The air compressor is connected to each high-pressure air knife through the airflow regulating valve. The outlet pressure of the high-pressure air knife is adjustable, with an adjustment range of 0.3-1.2 MPa.

[0015] As an optional embodiment of the present invention, the waste heat recovery module includes a gas-liquid heat exchanger and a gas storage tank. The outlet of the high-pressure air knife assembly is connected to the inlet of the gas-liquid heat exchanger, the outlet of the gas-liquid heat exchanger is connected to the gas storage tank, and the gas storage tank is also connected to the inlet of the air compressor, so as to supply the recovered waste heat gas back to the air compressor.

[0016] As an optional embodiment of the present invention, the load detection unit includes a pressure sensor, a temperature sensor, and a PLC controller. The pressure sensor is located at the inlet end of the cooling channel, and the temperature sensor is located at the outlet end of the cooling channel. The PLC controller has built-in load threshold determination logic. When the channel pressure detected by the pressure sensor is lower than a preset pressure threshold, and / or the outlet temperature detected by the temperature sensor is lower than a preset temperature threshold, it is determined to be a low load period and a cleaning program is started. Both the pressure sensor and the temperature sensor are electrically connected to the PLC controller.

[0017] As an optional embodiment of the present invention, the inner wall surface of the cooling channel is coated with a wear-resistant and corrosion-resistant coating, the coating material being polytetrafluoroethylene or a ceramic coating, and the coating thickness being 0.1-0.5 mm.

[0018] As an optional embodiment of the present invention, it also includes a particle collection module, which includes a dust collection chamber and a filter screen. The dust collection chamber is connected to the bottom end of the cooling flow channel, and the filter screen is disposed at the connection between the dust collection chamber and the waste heat recovery module for filtering particle impurities in the blowing airflow.

[0019] As an optional solution of the present invention, the cleaning trigger module is also equipped with a PLC controller. When the cleaning program is started, the ultrasonic cleaning component is first controlled to work for 1-5 minutes to break the particle adhesion on the flow channel wall, and then the high-pressure air knife component is controlled to work for 3-8 minutes to perform spiral blowing. The ultrasonic cleaning component and the high-pressure air knife component can work alternately in a cycle, with a cycle number of 1-3 times.

[0020] The above-mentioned technical solutions of the cooling device for shaping plastic particles provided in the embodiments of the present invention have at least one of the following technical effects:

[0021] 1. The distributed array of ultrasonic transducers allows the ultrasonic cavitation effect to cover all areas of the inner wall of the flow channel, breaking the strong adhesion between molten particles and the flow channel wall; the 360° circumferentially arranged high-pressure air knife forms a spiral airflow that sweeps along the flow channel axis and circumference in all directions, removing the broken particles without dead angles, solving the problems of "manual cleaning with many dead angles and a single air knife being unable to break molten adherents", and greatly improving cleaning efficiency;

[0022] 2. The waste heat recovery module recovers the purge airflow from the high-pressure air knife and uses the waste heat of the airflow to preheat the air compressor through a gas-liquid heat exchanger. The recovered waste heat airflow is then supplied back to the air compressor, which can reduce the heating energy consumption of the air compressor and is in line with the trend of green and energy-saving industrial development. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a perspective view of a cooling device for shaping plastic particles provided in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the internal structure of the cooling channel of the cooling device for shaping plastic particles provided in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the internal structure of the cooling chamber of the cooling device for shaping plastic particles provided in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the circumferential high-pressure air knife layout and spiral airflow of the cooling channel of the cooling device for shaping plastic particles provided in an embodiment of the present invention.

[0028] Figure 5 The control logic flowchart of the cleaning trigger module of the cooling device for shaping plastic particles provided in the embodiments of the present invention.

[0029] The following are the labeling elements in the figure:

[0030] 1. Cooling chamber; 11. Cooling channel; 2. Ultrasonic cleaning assembly; 21. Ultrasonic transducer; 3. High-pressure air knife assembly; 31. High-pressure air knife; 32. Air compressor; 33. Airflow regulating valve; 4. Waste heat recovery module; 41. Gas-liquid heat exchanger; 42. Air storage tank; 6. Load detection unit; 61. Pressure sensor; 62. Temperature sensor; 63. PLC controller; 7. Particle collection module; 71. Dust collection chamber; 72. Filter screen. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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, they should not be construed as limitations on the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0035] In one embodiment of the present invention, such as Figures 1-5 As shown, a cooling device for shaping plastic particles is provided, comprising:

[0036] The cooling chamber 1 has a cooling channel 11 inside for the flow of cooling medium. The cooling chamber 1 is made of stainless steel and has an arc-shaped cooling channel 11 with a diameter of 100 mm and a radius of curvature of 500 mm. The inlet end of the cooling channel 11 is connected to the conveying pipe of the high-temperature molten plastic cooling medium, and the outlet end is connected to the finished product cooling pool. The inner wall surface of the cooling channel 11 is coated with a polytetrafluoroethylene wear-resistant and corrosion-resistant coating with a thickness of 0.3 mm, which enhances the smoothness of the inner wall, reduces the initial adhesion of particles, and improves the wear resistance of the inner wall.

[0037] The ultrasonic cleaning component 2 includes multiple ultrasonic transducers 21, which are distributed along the inner wall of the cooling channel 11 to break up particle adhesions adhering to the wall of the cooling channel 11 through ultrasonic cavitation effect. The ultrasonic cleaning component 2 includes multiple ultrasonic transducers 21 and a power adjustment unit. The multiple ultrasonic transducers 21 are arranged in an array according to the curvature of the cooling channel 11, with a spacing of 10 cm between adjacent ultrasonic transducers 21. The ultrasonic emission surface of the ultrasonic transducer 21 is flush with the inner wall of the cooling channel 11 to avoid protrusions that form new particle adhesion points. The operating frequency of the ultrasonic transducers 21 is 30 kHz, and the adjustment range of the power adjustment unit is 500-2000 W. In this embodiment, the operating power is set to 1200 W for molten plastic adhesions.

[0038] The high-pressure air knife assembly 3 includes several high-pressure air knives 31, which are evenly arranged 360° around the cooling channel 11. The air outlets of the high-pressure air knives 31 are aligned to form a spiral airflow to purge the cooling channel 11. The air outlets of the high-pressure air knives 31 are provided with oblique cuts, which are at an angle of 30° to the axis of the cooling channel 11. All the oblique cuts of the high-pressure air knives 31 are aligned in the same direction (clockwise) to form a clockwise spiral purging airflow. The air compressor 32 is a screw air compressor 32. The airflow regulating valve 33 is connected to each high-pressure air knife 31. The air outlet pressure of the high-pressure air knife 31 is adjustable from 0.3 to 1.2 MPa. In this embodiment, the purging pressure is set to 0.8 MPa.

[0039] Waste heat recovery module 4 is connected to the air outlet of high pressure air knife assembly 3 and is used to recover the airflow discharged from high pressure air knife assembly 3.

[0040] The cleaning trigger module is electrically connected to the load detection unit 6, ultrasonic cleaning component 2, and high-pressure air knife component 3 of the cooling chamber 1. The cleaning trigger module is configured to automatically start the ultrasonic cleaning component 2 and / or high-pressure air knife component 3 for cleaning when the cooling load of the cooling chamber 1 is in a low load period, and the cleaning process does not interrupt the continuous production of the cooling chamber 1.

[0041] In another embodiment of the present invention, multiple ultrasonic transducers 21 are arranged in an array according to the curvature of the cooling channel 11, the spacing between adjacent ultrasonic transducers 21 is 5-15cm, and the ultrasonic emitting surface of the ultrasonic transducer 21 is flush with the inner wall of the cooling channel 11 to avoid forming cleaning dead corners.

[0042] In another embodiment of the present invention, the ultrasonic transducer 21 operates at a frequency of 20-40kHz and is equipped with a power adjustment unit with a power adjustment range of 500-2000W to meet the requirements for breaking down residual particles with different viscous molten states.

[0043] In another embodiment of the present invention, the outlet of the high-pressure air knife 31 is provided with an oblique cut, the oblique cut is at an angle of 15-45° with the axis of the cooling channel 11, and the oblique cuts of several high-pressure air knives 31 are oriented in the same direction to form a spiral blowing airflow in coordination.

[0044] In another embodiment of the present invention, the high-pressure air knife assembly 3 further includes an air compressor 32 and an airflow regulating valve 33. The air compressor 32 is connected to each high-pressure air knife 31 through the airflow regulating valve 33. The outlet pressure of the high-pressure air knife 31 is adjustable, and the adjustment range is 0.3-1.2 MPa.

[0045] In another embodiment of the present invention, the waste heat recovery module 4 includes a gas-liquid heat exchanger 41 and a gas storage tank 42. The outlet of the high-pressure air knife assembly 3 is connected to the inlet of the gas-liquid heat exchanger 41, and the outlet of the gas-liquid heat exchanger 41 is connected to the gas storage tank 42. The gas storage tank 42 is also connected to the inlet of the air compressor 32 to supply the recovered waste heat airflow back to the air compressor 32. The heat exchange medium of the gas-liquid heat exchanger 41 is cooling water, which can transfer the waste heat (temperature approximately 80°C) of the purge airflow to the cooling water, while simultaneously cooling the purge airflow. The outlet of the gas-liquid heat exchanger 41 is connected to the gas storage tank 42, and the outlet of the gas storage tank 42 is connected to the inlet of the air compressor 32, so that the preheated airflow to 40°C is supplied back to the air compressor 32, reducing the compression energy consumption of the air compressor 32.

[0046] In another embodiment of the present invention, the load detection unit 6 includes a pressure sensor 61, a temperature sensor 62, and a PLC controller 63. The pressure sensor 61 is located at the inlet end of the cooling channel 11 to detect the inlet pressure of the channel; the temperature sensor 62 is located at the outlet end of the cooling channel 11 to detect the outlet temperature of the cooling medium; the PLC controller 63 has built-in load threshold determination logic. When the channel pressure detected by the pressure sensor 61 is lower than a preset pressure threshold, and / or the outlet temperature detected by the temperature sensor 62 is lower than a preset temperature threshold, a low load period is determined and a cleaning program is initiated. The cleaning trigger module is the PLC controller 63, which has built-in load threshold determination logic: the preset pressure threshold is 0.5 MPa, and the preset temperature threshold is 60°C; when the channel pressure detected by the pressure sensor 61 is ≤0.5 MPa, and the outlet temperature detected by the temperature sensor 62 is ≤60°C, a low load period is determined, and the cleaning program is automatically initiated. Both the pressure sensor 61 and the temperature sensor 62 are electrically connected to the PLC controller 63. The PLC controller 63 is fixed to the dust collection chamber 71.

[0047] In another embodiment of the present invention, the inner wall surface of the cooling channel 11 is coated with a wear-resistant and corrosion-resistant coating, the coating material being polytetrafluoroethylene or a ceramic coating, and the coating thickness being 0.1-0.5 mm.

[0048] In another embodiment of the present invention, a particle collection module 7 is further included. The particle collection module 7 includes a dust collection chamber 71 and a filter screen 72. The dust collection chamber 71 is connected to the bottom end of the cooling channel 11 and is used to collect particles that fall during blowing. The filter screen 72 is disposed at the connection between the dust collection chamber 71 and the waste heat recovery module 4 and is used to filter particle impurities in the blowing airflow. The filter screen 72 is a stainless steel sintered mesh filter element (5μm pore size) and is disposed at the connection between the dust collection chamber 71 and the waste heat recovery module 4 to filter plastic particle impurities in the blowing airflow and prevent impurities from entering the waste heat recovery module 4 and causing blockage.

[0049] In another embodiment of the present invention, the cleaning trigger module is also equipped with a PLC controller 63. When the cleaning program is started, the ultrasonic cleaning component 2 is first controlled to work for 3 minutes to break the particle adhesion on the flow channel wall, and then the high-pressure air knife component 3 is controlled to work for 5 minutes to perform spiral blowing. The ultrasonic cleaning component 2 and the high-pressure air knife component 3 can work alternately in a cycle, with the number of cycles being 1-3 times.

[0050] The cooling device for shaping plastic particles provided in this application operates as follows:

[0051] During normal production: the cooling medium (high-temperature molten plastic) flows in the cooling channel 11, and the cooling chamber 1 cools the medium; the load detection unit 6 collects the channel pressure and liquid outlet temperature in real time and transmits the data to the cleaning trigger module.

[0052] Cleaning trigger determination: When production enters a low-load period (such as equipment standby or material replenishment stage), the flow channel pressure drops below 0.5MPa and the liquid outlet temperature drops below 60℃, the cleaning trigger module determines that the cleaning conditions are met and automatically starts the cleaning program.

[0053] Ultrasonic Destruction Stage: The cleaning trigger module controls the ultrasonic cleaning component 2 to start, and the ultrasonic transducer 21 emits 30kHz ultrasonic waves, which generate cavitation bubbles in the cooling channel 11. When the cavitation bubbles collapse, they form microjets and shock waves, which impact the molten plastic adhesive on the channel wall and break the adhesion between the particles and the channel wall.

[0054] Spiral blowing stage: After ultrasonic breaking for 3 minutes, the cleaning trigger module starts the high-pressure air knife assembly 3. The air compressor 32 outputs a high-pressure airflow of 0.8MPa, which is distributed to 12 high-pressure air knives 31 through the airflow regulating valve 33. The airflow forms a clockwise spiral airflow through the oblique cut, blowing along the channel axis and circumferentially, blowing the broken plastic particles into the dust collection chamber 71.

[0055] Alternating cycle phase: The ultrasound and air knife are alternated twice according to the logic of "ultrasound 2min → air knife 4min" to ensure that deep adhesions are completely broken up and blown away.

[0056] Waste heat recovery stage: After the high-pressure air knife assembly 3 completes spiral purging, the airflow carrying waste heat and particulate impurities first enters the dust collection chamber 71 of the particle collection module 7. Large particles settle to the bottom of the dust collection chamber 71 due to gravity. The remaining airflow flows through the filter screen 72 (stainless steel sintered mesh filter element) at the connection between the dust collection chamber 71 and the waste heat recovery module 4. The filter screen 72 traps micron-sized particulate impurities in the airflow, preventing impurities from entering the waste heat recovery module 4 and causing heat exchanger blockage and air source pollution. The filtered clean airflow enters the gas-liquid heat exchanger 41 of the waste heat recovery module 4 and exchanges heat with the cooling medium (such as cooling water) in the heat exchanger. The waste heat in the airflow is absorbed by the cooling medium and recovered. At the same time, the purging airflow itself is cooled down. The airflow that has completed heat exchange enters the gas storage chamber for temporary storage. The gas storage chamber returns the preheated clean airflow to the high-pressure air source inlet of the high-pressure air knife assembly 3 to replace part of the ambient temperature inlet air, reduce the energy consumption of high-pressure air source compression / heating airflow, and realize the recycling of waste heat of the purging airflow without impurity interference.

[0057] Cleaning complete: After the PLC controller 63 completes the cleaning, the cleaning trigger module shuts down the ultrasonic cleaning component 2 and the high-pressure air knife component 3, and the device returns to normal cooling operation. The particles in the dust collection chamber 71 can be cleaned periodically (e.g., monthly) by opening the drain port without affecting continuous production.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cooling and recovery device for shaping plastic particles, characterized in that, include: The cooling chamber has cooling channels inside for the flow of cooling medium. An ultrasonic cleaning assembly includes multiple ultrasonic transducers distributed on the inner wall of a cooling channel to remove particle adhesions adhering to the cooling channel wall through ultrasonic cavitation effect. The high-pressure air knife assembly includes several high-pressure air knives, which are evenly arranged 360° around the circumference of the cooling channel. The air outlets of the high-pressure air knives are adapted to form a spiral airflow to purge the cooling channel. Waste heat recovery module, which is connected to the air outlet of high-pressure air knife assembly, is used to recover the airflow discharged from high-pressure air knife assembly; The cleaning trigger module is electrically connected to the load detection unit, ultrasonic cleaning component, and high-pressure air knife component of the cooling cavity. The cleaning trigger module is configured to automatically start the ultrasonic cleaning component and / or high-pressure air knife component for cleaning when the cooling load of the cooling cavity is at a low load period, and the cleaning process does not interrupt the continuous production of the cooling cavity.

2. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, Multiple ultrasonic transducers are arranged in an array according to the curvature of the cooling channel. The spacing between adjacent ultrasonic transducers is 5-15cm, and the ultrasonic emission surface of the ultrasonic transducer is flush with the inner wall of the cooling channel to avoid forming cleaning dead zones.

3. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The ultrasonic transducer operates at a frequency of 20-40kHz and is equipped with a power adjustment unit with a power adjustment range of 500-2000W, adapting to the needs of breaking up residual particles in different viscous molten states.

4. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The high-pressure air knife has an oblique cut at its outlet. The angle between the oblique cut and the axis of the cooling channel is 15-45°. The oblique cuts of several high-pressure air knives face the same direction to form a spiral blowing airflow.

5. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The high-pressure air knife assembly also includes an air compressor and an airflow regulating valve. The air compressor is connected to each high-pressure air knife through the airflow regulating valve. The outlet pressure of the high-pressure air knife is adjustable, with an adjustment range of 0.3-1.2 MPa.

6. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The waste heat recovery module includes a gas-liquid heat exchanger and a gas storage tank. The outlet of the high-pressure air knife assembly is connected to the inlet of the gas-liquid heat exchanger, and the outlet of the gas-liquid heat exchanger is connected to the gas storage tank. The gas storage tank is also connected to the inlet of the air compressor to supply the recovered waste heat gas back to the air compressor.

7. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The load detection unit includes a pressure sensor, a temperature sensor, and a PLC controller. The pressure sensor is located at the inlet end of the cooling channel, and the temperature sensor is located at the outlet end of the cooling channel. The PLC controller has built-in load threshold determination logic. When the channel pressure detected by the pressure sensor is lower than a preset pressure threshold, and / or the outlet temperature detected by the temperature sensor is lower than a preset temperature threshold, it is determined to be a low load period and the cleaning program is started. Both the pressure sensor and the temperature sensor are electrically connected to the PLC controller.

8. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The inner wall surface of the cooling channel is coated with a wear-resistant and corrosion-resistant coating. The coating material is polytetrafluoroethylene or ceramic coating, and the coating thickness is 0.1-0.5mm.

9. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, It also includes a particle collection module, which includes a dust collection chamber and a filter screen. The dust collection chamber is connected to the bottom of the cooling channel, and the filter screen is located at the connection between the dust collection chamber and the waste heat recovery module to filter particulate impurities in the blowing airflow.

10. The cooling and recovery device for shaping plastic particles according to claim 1, characterized in that, The cleaning trigger module is also equipped with a PLC controller. When the cleaning program is started, it first controls the ultrasonic cleaning component to work for 1-5 minutes to break up the particle adhesion on the flow channel wall, and then controls the high-pressure air knife component to work for 3-8 minutes for spiral blowing. The ultrasonic cleaning component and the high-pressure air knife component can work alternately in a cycle of 1-3 times.

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