A multi-temperature-zone cooling and conveying belt self-cleaning EVA hot melt adhesive cooling equipment

Abstract

The utility model discloses a kind of multi-temperature zone cooling and conveying belt self-cleaning EVA hot melt adhesive cooling equipment, including cooling box, the both ends of cooling box are provided with import and export air curtain generator, its inside is provided with conveying belt, and by at least one chamber partition, internal space is separated into multiple independent temperature zone chambers along material conveying direction;The top of at least one temperature zone chamber is provided with cooling air supply component, and bottom is provided with return air component, cooling air supply component, return air component and the refrigerating unit being arranged in the outside of cooling box are connected by cold air conveying pipe to form closed cold air circulation loop;By separating cooling box into gradient cooling air cooling, precooling, deep cooling chamber and monitoring and adjusting temperature in real time, closed cold air circulation loop is constructed to realize cold air cascade utilization and energy-saving protection machine, also realize overall automatic operation and parameter flexible adjustment by means of control system, to guarantee EVA hot melt adhesive cooling effect, product performance stability.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing machinery technology, specifically to a multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling device. Background Technology

[0002] EVA hot melt adhesive is a solid thermoplastic adhesive made by melt mixing ethylene-vinyl acetate copolymer (EVA) as the core base material, supplemented with tackifying resins, plasticizers, antioxidants, fillers and other functional additives. Its core characteristics are that it is a stable solid at room temperature, and can quickly melt into a fluid state when heated (usually to 80-150℃). It has good wetting and tack, and can quickly cure to form a strong bond after contacting the adhered objects and cooling to room temperature. Moreover, there is no solvent evaporation in the whole process, which has the advantages of being environmentally friendly, fast bonding speed and convenient operation.

[0003] Publication number CN212826380U discloses a cooling device for EVA hot melt adhesive production. By using a fan, a first air-cooled chamber, and a second air-cooled chamber for gradual cooling, it avoids cracking of the EVA hot melt adhesive due to rapid cooling. Furthermore, a dehumidifier removes moisture from the cold air, preventing water droplets from forming when the cold air comes into contact with the EVA hot melt adhesive, thus not affecting product quality. The cold air in the first air-cooled chamber originates from the heated air in the second air-cooled chamber. This heated air is then returned to the refrigeration unit for further cooling, and then returned to the second air-cooled chamber. Through the coordinated operation of the cold air recovery mechanism, the refrigeration unit, and the dehumidifier, the cold air is recycled, reducing the energy consumption of the refrigeration unit and promoting energy conservation and environmental protection. However, this patent still has the following problems in practical use: This solution has two key problems in the cooling process of EVA hot melt adhesive: firstly, insufficient temperature control precision and a tendency for uneven cooling in certain areas; and secondly, energy waste and operational risks in the cold air circulation system. Regarding temperature control precision, while the three-stage cooling mode of "fan pre-cooling → first air-cooling chamber cooling → second air-cooling chamber cooling" avoids rapid cooling, it lacks a precise temperature gradient control mechanism. Specifically, this manifests as a lack of uniform cold air distribution and a missing temperature monitoring and feedback mechanism. The former is because the first and second cold air distributors rely solely on "several equally spaced cold air outlets" to deliver cold air, failing to consider the size and density of the EVA hot melt adhesive storage boxes, as well as the slight deviation of the conveyor belt, on the impact of the cold air coverage. This results in excessively rapid cooling near the cold air outlets. The delayed cooling in distant areas leads to inconsistent curing levels in the same batch of products, affecting physical properties such as thickness and hardness. The latter is due to the lack of temperature sensors in the entire cooling system, making it impossible to monitor the actual temperature in the two air-cooled chambers in real time. It is also impossible to adjust the power of the refrigeration unit, the speed of the axial fan, and the speed of the conveyor belt based on the real-time temperature of the EVA hot melt adhesive. For example, when the ambient temperature rises, the pre-cooling effect of the fan weakens. If the cooling intensity of the first air-cooled chamber is not increased in time, the cooling load of the second air-cooled chamber will increase sharply, which may prolong the cooling time and may also cause local cracking due to temperature fluctuations. Regarding the cold air circulation system, although the solution emphasizes "cold air recycling" to reduce energy consumption, the circulation path design is unreasonable: on the one hand, there is a risk of short-circuiting of the circulating airflow. The heated cold air in the second air-cooled chamber is drawn into the return air duct via the second suction hood and sent to the first air-cooled chamber. The heated cold air in the first air-cooled chamber is drawn into the refrigeration unit via the first suction hood. If the second suction hood is too close to the first cold air distributor, some low-temperature cold air will be drawn away without sufficient heat exchange with the EVA hot melt adhesive, leading to a decrease in cooling efficiency and increasing the ineffective energy consumption of the axial fan and refrigeration unit, which violates... While the initial intention was to save energy and protect the environment, there are potential risks of condensation and corrosion in the return air duct. The solution only removes moisture from the cold air output by the refrigeration unit using a dehumidifier, without considering the temperature changes of the cold air during circulation. For example, if the heated cold air from the second air-cooled chamber enters the uninsulated return air duct, condensation may occur due to the temperature difference with the outside environment. Furthermore, the trace amounts of organic matter carried by the heated cold air from the first air-cooled chamber are not filtered before being drawn into the refrigeration unit. Over a long period of operation, the mixture of dust, organic matter, and condensation will corrode the air inlet duct and internal components of the refrigeration unit, shortening the equipment's lifespan and increasing maintenance costs.

[0004] Therefore, a multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling device is proposed to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling equipment to solve the two key problems mentioned in the background art: insufficient temperature control accuracy and design defects of the cold air circulation system in the current EVA hot melt adhesive cooling process, which lead to uneven cooling, energy waste and potential equipment operation hazards.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling device, comprising a cooling box, The cooling box is equipped with inlet and outlet air curtain generators at both ends, and a conveyor belt is installed inside. The internal space is divided into multiple independent temperature zone chambers along the material conveying direction by at least one chamber partition. At least one of the temperature zone chambers is provided with a cooling air supply component at the top and a return air component at the bottom. The cooling air supply component and the return air component are connected to a refrigeration unit located outside the cooling box through a cold air delivery pipe to form a closed cold air circulation loop. A cleaning assembly is provided below the conveyor belt. The cleaning assembly includes a movable plate that can move laterally and a cleaning brush roller that is driven by a cleaning roller drive motor and is in contact with the surface of the conveyor belt.

[0007] Preferably, the temperature zone chamber includes an air-cooled chamber, a pre-cooled chamber, and a cryogenic chamber arranged sequentially along the material conveying direction, and an inter-chamber air curtain isolator is installed at the center of the chamber partition.

[0008] Preferably, the cooling air supply component includes a cooling fan installed on the top of the air-cooled chamber, and an air outlet grille installed on the top of the pre-cooling chamber and the cryogenic chamber.

[0009] Preferably, the air outlet grille is provided with guide vanes and flow equalization plates inside, which are detachably connected to the cooling box via a quick-connect module.

[0010] Preferably, the cold air circulation loop includes: The output end of the refrigeration unit is connected to the air outlet grille at the top of the cryogenic chamber via a cold air delivery pipe and an air dehumidifier; The bottom of the cryogenic chamber is connected to the air outlet grille at the top of the precooling chamber via a first absorption pipe, a first filter device, and an axial flow fan. The bottom of the precooling chamber is connected to the input end of the refrigeration unit through a second absorption pipe and a second filter device; The outer walls of the cold air delivery pipe, the first absorption pipe, and the second absorption pipe are all wrapped with a heat insulation layer.

[0011] Preferably, the cleaning assembly further includes a mounting bracket, a lateral drive motor, and a cleaning roller drive motor; The lateral drive motor drives the ball screw pair through the lateral transmission mechanism, thereby causing the moving plate to move laterally along the mounting bracket. The cleaning roller drive motor drives the driven roller, and the driven roller transmits power to the cleaning brush roller through the cleaning roller transmission mechanism and connecting parts.

[0012] Preferably, a sliding sleeve is slidably connected to the driven roller via a flat key, and the cleaning roller transmission mechanism is connected between the sliding sleeve and the connecting member, so that the cleaning brush roller can still rotate when it moves laterally with the moving plate.

[0013] Preferably, the conveyor belt is symmetrically provided with correction rollers on one side of both ends, and each of the temperature zone chambers is equipped with a temperature sensor.

[0014] Preferably, the quick-connect module includes a module body that is fixedly connected to the air outlet grille and has a snap-fit ​​groove inside, and a boss that is fixedly connected to the cooling box and can be snapped into the snap-fit ​​groove. The boss is locked by a locking pin, and a spring is sleeved on the outside of the locking pin.

[0015] Preferably, the cooling box is equipped with a control system that is electrically connected to the inlet and outlet air curtain generator, conveyor belt, refrigeration unit, temperature sensor and each drive motor.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling equipment divides the cooling box into gradient cooling, pre-cooling, and deep cooling chambers and monitors and adjusts the temperature in real time, constructing a closed-loop cold air circulation circuit to achieve tiered utilization of cold air and energy-saving machine protection. It is equipped with conveyor belt cleaning components, quick-change air outlet grilles, and alignment rollers. Furthermore, it utilizes a control system to achieve overall automated operation and flexible parameter adjustment, thereby ensuring the cooling effect of EVA hot melt adhesive and stable product performance. Simultaneously, it reduces energy consumption, extends equipment life, reduces maintenance downtime, and improves adaptability. The specific details are as follows: Firstly, this invention uses chamber partitions to divide the cooling box into a wind-cooled chamber, a pre-cooled chamber, and a cryogenic chamber arranged sequentially along the material conveying direction, forming a gradient cooling structure that effectively avoids physical performance defects that may occur in EVA hot melt adhesive due to rapid cooling. Simultaneously, temperature sensors are installed inside each temperature zone chamber to monitor the internal temperature data in real time and feed it back to the control system. Combined with inlet and outlet air curtain generators and inter-chamber air curtain isolators, this prevents temperature disturbances caused by cross-flow of air between temperature zones and allows the control system to precisely adjust the power of the refrigeration unit, the operating status of the cooling air supply components, and the conveyor belt speed based on the monitoring data. Furthermore, the air outlet grilles at the top of the pre-cooled and cryogenic chambers are equipped with guide vanes and flow equalization plates. This optimizes the cold air delivery path according to the size and density of the EVA hot melt adhesive storage boxes, ensuring uniform cold air coverage of the material surface. This avoids the problem of excessively rapid cooling near the cold air outlet and delayed cooling in areas further away, ensuring consistent curing degree of the same batch of EVA hot melt adhesive and improving the stability of physical properties such as product thickness and hardness. Secondly, this invention constructs a closed-loop cold air circulation system. The cold air output from the refrigeration unit is dehumidified by an air dehumidifier and then transported to the cryogenic chamber. After being heated in the cryogenic chamber, the cold air passes through a first absorption pipe and a first filter to remove impurities and trace organic matter. It is then transported by an axial fan to a pre-cooling chamber for secondary use. The cold air heated in the pre-cooling chamber is further filtered through a second absorption pipe and a second filter before returning to the refrigeration unit, achieving cascaded utilization of cold air and significantly reducing energy consumption. Simultaneously, the outer walls of the cold air delivery pipe, the first absorption pipe, and the second absorption pipe are all wrapped with insulation layers, effectively preventing condensation caused by temperature differences between the circulating cold air and the external environment. Furthermore, the first and second filters intercept dust, organic matter, and other impurities in the circulating air, preventing them from entering the refrigeration unit and mixing with condensate to corrode equipment components, extending equipment lifespan, and reducing maintenance costs. In addition, this circulation path design can avoid short-circuiting of the circulating airflow, ensure sufficient heat exchange between the cold air and the EVA hot melt adhesive, avoid ineffective energy consumption of the axial fan and the chiller, and truly implement the concept of energy conservation and environmental protection. Furthermore, this invention features a cleaning component located beneath the conveyor belt. The cleaning roller drive motor drives the cleaning brush roller to rotate via the driven roller and the cleaning roller transmission mechanism. Simultaneously, the lateral drive motor, through the lateral transmission mechanism and ball screw pair, drives the moving plate to move laterally along the mounting bracket. This allows the cleaning brush roller to fully contact the conveyor belt surface for cleaning, effectively removing residual EVA hot melt adhesive debris and other impurities, preventing impurity accumulation that could affect the conveyor belt's operational stability or contaminate subsequent materials. The sliding sleeve on the driven roller, connected by a flat key, ensures the cleaning brush roller remains rotating during lateral movement, guaranteeing cleaning effectiveness. Additionally, the exhaust grille is detachably connected to the cooling chamber via a quick-change connection module. When maintenance of the exhaust grille or the interior of the cooling chamber is required, simply pulling out the locking pin allows for quick disassembly of the exhaust grille, simplifying operation, reducing equipment downtime for maintenance, and ensuring continuous production. Finally, this invention features symmetrically arranged correction rollers on one side of both ends of the conveyor belt, which effectively corrects slight deviations that may occur during conveyor belt operation. This prevents material position deviations caused by conveyor belt misalignment from affecting the cooling effect and ensures stable conveying. Simultaneously, the control system is electrically connected to the inlet and outlet air curtain generators, conveyor belt, refrigeration unit, temperature sensors, and various drive motors, enabling overall automated operation of the equipment. This reduces manual intervention, minimizes human error, and improves the stability and reliability of the equipment. Furthermore, it allows for flexible adjustment of operating parameters according to different specifications and production needs of EVA hot melt adhesive, resulting in greater adaptability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Schematic diagram of the internal structure of the intermediate cooling box; Figure 3 This is a three-dimensional structural diagram of the conveyor belt in this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the air outlet grille in this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the cleaning component structure in this utility model; Figure 7 This utility model Figure 6 Another view of the mounting bracket structure.

[0018] In the diagram: 1. Cooling box; 2. Inlet / outlet air curtain generator; 3. Conveyor belt; 301. Correcting roller; 4. Chamber partition; 401. Inter-chamber air curtain isolator; 5. Air-cooled chamber; 501. Cooling fan; 6. Pre-cooling chamber; 7. Cryogenic chamber; 8. Temperature sensor; 9. Cleaning assembly; 901. Mounting bracket; 902. Lateral drive motor; 903. Cleaning roller drive motor; 904. Lateral transmission mechanism; 905. Ball screw pair; 906. Driven roller; 907. Moving plate; 908. Cleaning roller. Roller drive mechanism; 909, Connector; 910, Cleaning brush roller; 10, Air outlet grille; 1001, Guide vane; 1002, Flow equalization plate; 11, Quick-change connection module; 1101, Snap-fit ​​groove; 1102, Boss; 1103, Locking pin; 1104, Spring; 12, Refrigeration unit; 13, Cold air delivery pipe; 14, Air dehumidifier; 15, First absorption pipe; 16, First filter device; 17, Axial flow fan; 18, Second absorption pipe; 19, Second filter device; 20, Control system. Detailed Implementation

[0019] 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 some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0020] like Figure 1-7 As shown, this utility model provides a multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling device. The core structure revolves around the cooling box 1, achieving segmented and precise cooling of EVA hot melt adhesive materials and self-cleaning of the equipment. The cooling box 1 serves as the main frame of the equipment, with inlet and outlet air curtain generators 2 installed at both ends. These generators form an air curtain barrier when materials enter or exit the equipment, effectively preventing air exchange between the inside and outside of the box. This avoids external ambient temperature air from entering and affecting the temperature stability of the box, while also preventing cold air leakage from the box and thus avoiding energy waste. Inside the cooling chamber 1, a conveyor belt 3 is installed horizontally. The conveyor belt 3 is made of food-grade polyurethane material with high temperature resistance and a low coefficient of friction, ensuring it is not prone to embrittlement or deformation during long-term low-temperature operation and meeting the cleanliness requirements of EVA hot melt adhesive material transportation. The conveying speed of the conveyor belt 3 can be infinitely adjusted via an external control system, with an adjustment range of 0.5-5 m / min, to adapt to EVA hot melt adhesive materials of different thicknesses and cooling requirements. Furthermore, symmetrically arranged on one side of both ends of the conveyor belt 3 are correction rollers 301. These rollers 301 are driven by cylinders to achieve fine-tuning of their lateral position. When the conveyor belt 3 deviates during operation, the correction rollers 301 can promptly correct it, ensuring that the conveyor belt 3 always runs smoothly along the preset trajectory, preventing uneven cooling or material drop due to conveyor belt deviation. The cooling chamber 1 is divided into three independent temperature zones by two chamber partitions 4 along the material conveying direction (i.e., the running direction of the conveyor belt 3): an air-cooled chamber 5, a pre-cooled chamber 6, and a cryogenic chamber 7. Each temperature zone is equipped with a temperature sensor 8, which is a high-precision platinum resistance temperature sensor with a measurement accuracy of ±0.1℃. Its output signal is transmitted in real-time to the external control system 20 to monitor the temperature changes in each temperature zone and provide data support for subsequent temperature control. Simultaneously, an inter-chamber air curtain isolator 401 is installed at the center of the chamber partitions 4. The inter-chamber air curtain isolator 401 generates a vertically downward air curtain through a built-in fan, further strengthening the airflow isolation between adjacent temperature zones, preventing air from different temperature zones from permeating each other, and ensuring that the temperature of each temperature zone is stably maintained within a preset range. Air-cooled chamber 5: A cooling fan 501 is installed on its top. The cooling fan 501 is an axial flow fan, with 2-4 units (preferably 3 units in this embodiment), evenly distributed along the width of the conveyor belt 3. The wind speed of the cooling fan 501 can be adjusted by the control system 20, with an adjustment range of 1-5 m / s. Its main function is to send ambient temperature air into the air-cooled chamber 5 after preliminary filtration, to initially cool the high-temperature EVA hot melt adhesive material that has just entered the equipment, removing some of the heat from the surface of the material, preparing for subsequent pre-cooling and deep-cooling processes. A return air louver (as a return air component) is installed at the bottom of the air-cooled chamber 5. The return air louver is connected to the exhaust pipe outside the cooling box 1, expelling the heat-absorbing air outside the equipment, forming an open air-cooling circulation. Pre-cooling chamber 6 and cryogenic chamber 7: Both are equipped with air outlet grilles 10 on their tops. The structure of the air outlet grilles 10 is as follows: Figure 4As shown, the internal components are arranged sequentially along the direction of cold air flow, with guide vanes 1001 and flow equalization plates 1002. The guide vanes 1001 are inclined to guide the flow direction of the cold air, allowing the cold air to be blown more accurately onto the material on the conveyor belt 3. The flow equalization plate 1002 adopts a perforated plate structure with a hole diameter of 5-8mm, and the hole distribution density gradually increases along the direction of cold air flow, which can effectively disperse the cold air evenly and avoid local wind speeds that are too high or too low when the cold air is discharged, thus ensuring the uniformity of material cooling. The air outlet grille 10 is detachably connected to the cooling box 1 via a quick-change connection module 11. The specific structure of the quick-change connection module 11 is as follows: Figure 5 As shown, the system includes a module body fixedly connected to the air outlet grille 10 and a boss post 1102 fixedly connected to the cooling box 1. The module body has a snap-fit ​​groove 1101 adapted to the boss post 1102, allowing the boss post 1102 to be directly snapped into the snap-fit ​​groove 1101. Simultaneously, a locking pin 1103 is provided on the boss post 1102, and a spring 1104 is sleeved on the outer side of the locking pin 1103. When the boss post 1102 is snapped into the snap-fit ​​groove 1101, the locking pin 1103 pops out under the elastic force of the spring 1104, achieving rapid locking between the air outlet grille 10 and the cooling box 1. When cleaning or maintenance of the air outlet grille 10 is required, simply pull the locking pin 1103 to remove the air outlet grille 10 from the cooling box (1), making operation convenient and effectively improving equipment maintenance efficiency. Both the pre-cooling chamber 6 and the deep-cooling chamber 7 are equipped with return air ducts (as return air components) at their bottoms. Dust filters are installed at the air inlets of the return air ducts to filter impurities in the air and prevent them from entering the subsequent cold air circulation loop and causing blockage or pollution. The cold air circulation loop of this equipment is centered around the refrigeration unit 12. The refrigeration unit 12 uses a scroll compressor with a cooling capacity ranging from 5-20kW (a 10kW unit is selected in this embodiment based on equipment specifications). Its operating temperature range is -30℃ to 5℃, which can meet the low-temperature requirements of the cryogenic chamber 7. The specific connection relationship of the cold air circulation loop is as follows: The output end of the refrigeration unit 12 is connected to the input end of the air dehumidifier 14 through the cold air delivery pipe 13. The air dehumidifier 14 adopts the refrigeration dehumidification method, with a dehumidification capacity of 0.5-2 kg / h (preferably 1 kg / h in this embodiment). It can remove the moisture in the cold air output by the refrigeration unit 12, so that the relative humidity of the cold air is maintained between 30% and 50%, avoiding condensation in the cold air at low temperature, preventing condensate from adhering to the surface of the material and affecting the quality of the material, and protecting the internal components of the equipment from moisture damage. The output end of the air dehumidifier 14 is connected to the air outlet grille 10 at the top of the deep cooling chamber 7 through the cold air delivery pipe 13. After being dehumidified, the cold air passes through the guide plate 1001 and the flow equalization plate 1002 of the air outlet grille 10 and is evenly blown onto the material on the conveyor belt 3 to deeply cool the material, so that the material temperature drops to -5℃ to 0℃ (the specific temperature can be adjusted by the control system 20 according to the material requirements). The return air duct (i.e., the first absorption pipe 15) at the bottom of the cryogenic chamber 7 collects the cooled air after heat absorption. The output end of the first absorption pipe 15 is connected in sequence to the first filter device 16 and the axial flow fan 17. The first filter device 16 adopts a combination structure of a primary filter and a medium-efficiency filter. The primary filter can filter impurities with a particle size greater than 5μm, and the medium-efficiency filter can filter impurities with a particle size greater than 1μm, effectively removing dust, material debris and other impurities from the cooled air. The axial flow fan 17 provides power for the cooling air circulation, and its air volume is 1000-3000m³ / h (preferably 2000m³ / h in this embodiment), delivering the filtered cooled air to the air outlet grille 10 at the top of the precooling chamber 6. The air outlet grille 10 at the top of the precooling chamber 6 blows cold air evenly onto the material, further cooling the material after air cooling treatment to a temperature of 5°C to 10°C (the specific temperature can be adjusted by the control system 20). The return air duct (i.e., the second absorption pipe 18) at the bottom of the precooling chamber 6 collects the cooled air after heat absorption. The output end of the second absorption pipe 18 is connected to the second filter device 19. The second filter device 19 adopts the same structure as the first filter device 16 to filter the cold air again, ensuring the cleanliness of the cold air entering the refrigeration unit 12. The output end of the second filter device 19 is connected to the input end of the refrigeration unit 12 to complete the recycling of cold air. In addition, the outer walls of the cold air delivery pipe 13, the first absorption pipe 15 and the second absorption pipe 18 are all wrapped with a heat insulation layer. The heat insulation layer is made of polyurethane insulation material with a thickness of 30-50mm (preferably 40mm in this embodiment). The thermal conductivity of the heat insulation layer is ≤0.024W / (m・K), which can effectively reduce the loss of cold energy during the transportation process, improve energy utilization efficiency, and prevent condensation on the outer wall of the pipe. A cleaning component 9 is installed below the conveyor belt 3. The structure of the cleaning component 9 is as follows: Figure 6-7 As shown, the main components include a mounting bracket 901, a horizontal drive motor 902, a cleaning roller drive motor 903, a moving plate 907, and a cleaning brush roller 910. The mounting bracket 901 is made of stainless steel and is bolted to the bottom frame of the cooling box 1, providing support for the entire cleaning assembly 9. Both the horizontal drive motor 902 and the cleaning roller drive motor 903 are servo motors, characterized by stable operation and high speed regulation accuracy. Their output speed can be precisely controlled by the control system 20. Lateral movement power transmission: The output shaft of the lateral drive motor 902 is connected to the lateral transmission mechanism 904 via a coupling. The lateral transmission mechanism 904 is a gear transmission mechanism, consisting of a driving gear and a driven gear. The driving gear is fixedly connected to the output shaft of the lateral drive motor 902, and the driven gear is fixedly connected to one end of the lead screw of the ball screw pair 905. The lead screw of the ball screw pair 905 is mounted on the mounting bracket 901 via a bearing seat, and its nut is fixedly connected to the moving plate 907. When the lateral drive motor 902 starts, it drives the lead screw of the ball screw pair 905 to rotate through the lateral transmission mechanism 904. The rotation of the lead screw is converted into the lateral movement of the nut, which in turn drives the moving plate 907 to move laterally along the guide rail on the mounting bracket 901. The moving speed of the moving plate 907 is in the range of 0.1-0.5 m / s, which can be adjusted according to the degree of contamination of the conveyor belt 3. The cleaning brush roller's rotation is powered by a coupling connecting the output shaft of the cleaning roller drive motor 903 to the driven roller 906, which is mounted on the mounting bracket 901 via bearings. A sliding sleeve is slidably connected to the driven roller 906 via a key, allowing it to slide freely along the axial direction of the driven roller 906 while rotating synchronously with it. The sliding sleeve is connected to the connecting piece 909 via a cleaning roller transmission mechanism 908, which is a synchronous belt drive mechanism consisting of a driving synchronous pulley, a driven synchronous pulley, and a synchronous belt. The driving synchronous pulley is fixedly connected to the sliding sleeve, and the driven synchronous pulley is fixedly connected to one end of the cleaning brush roller 910 via the connecting piece 909. The other end of the cleaning brush roller 910 is mounted on the moving plate 907 via a bearing. The bristles of the cleaning brush roller 910 are made of nylon material with a bristle diameter of 0.1-0.3mm and a bristle density of 500-800 bristles / cm². The bristle length is slightly longer than the distance between the surface of the conveyor belt 3 and the moving plate 907, ensuring that the bristles of the cleaning brush roller 910 can fit tightly against the surface of the conveyor belt 3. When the cleaning roller drive motor 903 starts, it drives the driven roller 906 to rotate. The driven roller 906 transmits power to the cleaning brush roller 910 through the sliding sleeve and the cleaning roller transmission mechanism 908, causing the cleaning brush roller 910 to rotate at a speed range of 50-200 r / min. Simultaneously, since the sliding sleeve can slide along the axial direction of the driven roller 906, when the moving plate 907 moves laterally, the cleaning brush roller 910 moves laterally synchronously with the moving plate 907. The sliding sleeve slides on the driven roller 906, thus ensuring that the cleaning brush roller 910 maintains stable rotation while moving laterally, achieving comprehensive cleaning of the conveyor belt 3 surface. The cooling box 1 is equipped with a control system 20, which uses a PLC control system and features a touch screen interface. Users can use the touch screen to set equipment parameters, control operation, monitor status, and trigger fault alarms. The control system 20 is electrically connected to components such as the inlet / outlet air curtain generator 2, conveyor belt 3, refrigeration unit 12, temperature sensor 8, transverse drive motor 902, and cleaning roller drive motor 903 via wires, enabling coordinated operation of all components. Temperature sensors 8 in each temperature zone chamber transmit temperature signals to the control system 20 in real time. The control system 20 compares the actual temperature with the set temperature. When the actual temperature of the cryogenic chamber 7 is higher than the set temperature, the control system 20 automatically increases the cooling capacity of the refrigeration unit 12 and increases the airflow of the axial fan 17 to accelerate the cold air circulation speed, so that the temperature of the cryogenic chamber 7 drops to the set value; when the actual temperature is lower than the set temperature, the control system 20 reduces the cooling capacity of the refrigeration unit 12 and reduces the airflow of the axial fan 17 to maintain a stable temperature. The temperature of the precooling chamber 6 is controlled by adjusting the air volume of the axial fan 17. When the actual temperature is higher than the set temperature, the air volume of the axial fan 17 is increased to deliver more cold air; when the actual temperature is lower than the set temperature, the air volume of the axial fan 17 is reduced. The temperature of the air-cooled chamber 5 is controlled by adjusting the speed of the cooling fan 501. When the actual temperature is higher than the set temperature, the speed of the cooling fan 501 is increased; when the actual temperature is lower than the set temperature, the speed of the cooling fan 501 is decreased. Material conveying and cooling coordination: When material enters the cooling chamber 1 via conveyor belt 3, the inlet and outlet air curtain generators 2 automatically start to form an air curtain. Simultaneously, the refrigeration unit 12, cooling fan 501, and axial flow fan 17 start operating according to preset cooling parameters, ensuring that the corresponding chamber reaches the set temperature when the material enters each temperature zone. As the material passes sequentially through the air-cooled chamber 5, pre-cooled chamber 6, and cryogenic chamber 7 driven by conveyor belt 3, the cooling systems in each temperature zone continue to operate, achieving segmented cooling of the material. When the material is about to leave the cooling chamber 1, the speed of conveyor belt 3 is finely adjusted according to the connection requirements of subsequent processes. Meanwhile, the inlet and outlet air curtain generators 2 remain running until the last batch of material has completely left the equipment, at which point the air curtain generators 2 will delay shutting down to prevent a large amount of external air from entering the chamber when the material leaves. The cleaning component operates in tandem with the equipment: the operation of the cleaning component 9 is linked to the operating status of the conveyor belt 3. When the equipment is in normal cooling operation, if the timed cleaning mode is set, the cleaning component 9 will start cleaning according to a preset cycle while the conveyor belt 3 is running continuously. At this time, the lateral movement speed of the cleaning brush roller 910 matches the conveying speed of the conveyor belt 3, ensuring that the surface of the conveyor belt 3 is cleaned without affecting the material conveying. If the equipment is stopped, the user can start the cleaning component 9 for comprehensive cleaning through the control system 20. At this time, the conveyor belt 3 can run at a low speed (0.1-0.2 m / min), allowing the cleaning brush roller 910 to clean the entire surface of the conveyor belt 3. In addition, when the cleaning component 9 experiences abnormalities such as jamming or motor overload during operation, the control system 20 will immediately stop the operation of the cleaning component 9 and issue an alarm signal. At the same time, the fault location and cause will be displayed on the touch screen, facilitating timely troubleshooting by the staff. Working Principle: Before using this multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling equipment, it is necessary to check the overall condition of the device to ensure it can operate normally. Figure 1 - Figure 7 As shown, when the equipment is started by the control system 20, the inlet and outlet air curtain generators 2 first start working, forming airflow barriers at both ends of the cooling box 1 to prevent air exchange between the inside and outside of the box, maintain the temperature stability inside the box, and prevent external dust from entering the box and contaminating the material. Subsequently, the conveyor belt 3 starts, and its running speed is adjusted by the control system 20. The material is conveyed from the inlet end of the cooling box 1 into the box. During the process, the correction rollers 301 at both ends of the conveyor belt 3 correct the position of the conveyor belt 3 in real time to prevent the conveyor belt 3 from deviating and causing the material conveying position deviation. After the material enters the cooling chamber 1 via the conveyor belt 3, it passes sequentially through the air-cooled chamber 5, the pre-cooled chamber 6, and the cryogenic chamber 7, which are separated by chamber partitions 4. Inter-chamber air curtain isolators 401 create airflow barriers between the chambers, preventing air mixing between different temperature zones and ensuring stable temperatures in each zone. Temperature sensors 8 within each temperature zone chamber collect real-time temperature data and transmit it to the control system 20, which then dynamically adjusts the cooling system according to preset temperature parameters. Cooling of the air-cooled chamber 5: The cooling fan 501 at the top of the air-cooled chamber 5 starts to draw in ambient air and blow it onto the surface of the material, which initially cools down the high-temperature EVA hot melt adhesive material that has just entered the chamber, removes some of the heat from the surface of the material, and prepares for subsequent deep cooling. Cooling of Pre-cooling Chamber 6: The cooling air of pre-cooling chamber 6 originates from the return air of cryogenic chamber 7. After the low-temperature return air at the bottom of cryogenic chamber 7 is collected by the first absorption pipe 15, the return air first passes through the first filter device 16 to filter out dust and impurities in the air, and then is conveyed by the axial flow fan 17 to the air outlet grille 10 at the top of pre-cooling chamber 6. The guide vanes 1001 and the flow equalization plate 1002 inside the air outlet grille 10 guide and equalize the airflow, so that the low-temperature airflow is evenly blown onto the material, further cooling the material that has undergone preliminary cooling and reducing the temperature difference between the material and cryogenic chamber 7. Cryogenic Chamber 7 Cooling: After the refrigeration unit 12 starts, the generated low-temperature cold air is transported through the cold air delivery pipe 13. Along the way, it passes through the air dehumidifier 14 to remove moisture from the cold air, preventing low-temperature, high-humidity air from contacting the material and causing condensation on the material surface. The dehumidified low-temperature cold air is then delivered to the air outlet grille 10 at the top of the cryogenic chamber 7. After being processed by the guide vanes 1001 and the flow equalization plate 1002, it is evenly blown onto the material to deeply cool it, allowing the EVA hot melt adhesive material to quickly set. The low-temperature return air from the cryogenic chamber 7 enters the precooling chamber 6 for recycling via the first absorption pipe 15. The return air from the precooling chamber 6 is collected through the second absorption pipe 18, filtered by the second filter device 19, and then returned to the input end of the refrigeration unit 12, forming a closed cold air circulation loop and improving the utilization rate of cooling capacity. At the same time, the insulation layer wrapped around the outer walls of the cold air delivery pipe 13, the first absorption pipe 15, and the second absorption pipe 18 effectively reduces the loss of cooling capacity during the transportation process, further ensuring the cooling effect of each temperature zone. In addition, the air outlet grille 10 is connected to the cooling box 1 via a quick-change connection module 11. When maintenance or replacement of the air outlet grille 10 is required, simply pull out the locking pin 1103 in the quick-change connection module 11 (the spring 1104 on the outside of the locking pin 1103 is compressed) to remove the air outlet grille 10, which is fixed to the module body, from the boss post 1102, making the operation convenient. During equipment operation, EVA hot melt adhesive residue or dust may adhere to the surface of conveyor belt 3. At this time, the cleaning component 9 is activated under the control of the control system 20 to automatically clean the surface of conveyor belt 3. The specific process is as follows: Cleaning component movement drive: The horizontal drive motor 902 of the cleaning component 9 starts and drives the ball screw pair 905 to rotate through the horizontal transmission mechanism 904, so that the moving plate 907 that cooperates with the ball screw pair 905 moves laterally back and forth along the mounting bracket 901, ensuring that the cleaning brush roller 910 can cover the entire width of the conveyor belt 3. Cleaning brush roller rotation drive: After the cleaning roller drive motor 903 starts, it drives the driven roller 906 to rotate. The sliding sleeve on the driven roller 906, which is slidably connected by a flat key, rotates synchronously with the driven roller 906. The sliding sleeve transmits power to the connecting member 909 through the cleaning roller transmission mechanism 908, thereby driving the cleaning brush roller 910, which is fixed to the connecting member 909, to rotate. Since the sliding sleeve can slide along the flat key of the driven roller 906, the cleaning brush roller 910 can still maintain stable rotation when the moving plate 907 drives the cleaning brush roller 910 to move laterally. Through the friction between the brush and the surface of the conveyor belt 3, residual impurities on the surface of the conveyor belt 3 are removed, ensuring the cleanliness of the conveyor belt 3 and preventing impurities from contaminating subsequent materials.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-temperature zone cooling and conveyor belt self-cleaning EVA hot melt adhesive cooling device, comprising a cooling box (1), characterized in that: The cooling box (1) is equipped with inlet and outlet air curtain generators (2) at both ends, and a conveyor belt (3) is installed inside it. The internal space is divided into multiple independent temperature zone chambers along the material conveying direction by at least one chamber partition (4). At least one of the temperature zone chambers is provided with a cooling air supply component at the top and a return air component at the bottom. The cooling air supply component and the return air component are connected to the refrigeration unit (12) located outside the cooling box (1) through a cold air delivery pipe (13) to form a closed cold air circulation loop. A cleaning assembly (9) is provided below the conveyor belt (3). The cleaning assembly (9) includes a movable plate (907) that can move laterally and a cleaning brush roller (910) driven by a cleaning roller drive motor (903) and in contact with the surface of the conveyor belt (3).

2. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 1, characterized in that: The temperature zone chamber includes an air-cooled chamber (5), a pre-cooled chamber (6) and a cryogenic chamber (7) arranged sequentially along the material conveying direction. An inter-chamber air curtain isolator (401) is installed at the center of the chamber partition (4).

3. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 2, characterized in that: The cooling air supply components include a cooling fan (501) installed on the top of the air-cooled chamber (5) and an air outlet grille (10) installed on the top of the pre-cooled chamber (6) and the deep-cooled chamber (7).

4. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 3, characterized in that: The air outlet grille (10) is equipped with a guide vane (1001) and a flow equalization plate (1002), which are detachably connected to the cooling box (1) via a quick-connect module (11).

5. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 2, characterized in that: The cold air circulation loop includes: The output end of the refrigeration unit (12) is connected to the air outlet grille (10) at the top of the cryogenic chamber (7) via the cold air delivery pipe (13) and the air dehumidifier (14); The bottom of the cryogenic chamber (7) is connected to the air outlet grille (10) at the top of the precooling chamber (6) through the first absorption pipe (15), the first filter device (16) and the axial flow fan (17); The bottom of the precooling chamber (6) is connected to the input end of the refrigeration unit (12) through the second absorption pipe (18) and the second filter device (19); The outer walls of the cold air delivery pipe (13), the first absorption pipe (15), and the second absorption pipe (18) are all wrapped with a heat insulation layer.

6. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 1, characterized in that: The cleaning assembly (9) also includes a mounting bracket (901), a transverse drive motor (902), and a cleaning roller drive motor (903). The transverse drive motor (902) drives the ball screw pair (905) through the transverse transmission mechanism (904), thereby causing the moving plate (907) to move laterally along the mounting bracket (901); The cleaning roller drive motor (903) drives the driven roller (906), and the driven roller (906) transmits power to the cleaning brush roller (910) through the cleaning roller transmission mechanism (908) and the connector (909).

7. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 6, characterized in that: A sliding sleeve is slidably connected to the driven roller (906) via a flat key. The cleaning roller transmission mechanism (908) is connected between the sliding sleeve and the connecting piece (909), so that the cleaning brush roller (910) can still rotate when it moves laterally with the moving plate (907).

8. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 1, characterized in that: One side of each end of the conveyor belt (3) is symmetrically provided with a correction roller (301), and each temperature zone chamber is equipped with a temperature sensor (8).

9. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning as described in claim 4, characterized in that: The quick-connect module (11) includes a module body that is fixedly connected to the air outlet grille (10) and has a snap-fit ​​groove (1101) inside, and a boss post (1102) that is fixedly connected to the cooling box (1) and can be snapped into the snap-fit ​​groove (1101). The boss post (1102) is locked by a locking pin (1103), and a spring (1104) is sleeved on the outside of the locking pin (1103).

10. The EVA hot melt adhesive cooling device with multi-temperature zone cooling and conveyor belt self-cleaning according to claim 1, characterized in that: The cooling box (1) is equipped with a control system (20) that is electrically connected to the inlet and outlet air curtain generator (2), conveyor belt (3), refrigeration unit (12), temperature sensor (8) and each drive motor.

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