Double-color dehumidifying and drying equipment and control method thereof

Abstract

The double-color dehumidifying and drying equipment comprises a dehumidifying assembly and two material barrel assemblies, the two material barrel assemblies are used for drying plastic raw materials, each material barrel assembly comprises a drying barrel, an air door actuator, a temperature detector, an air supply pipeline and an air return pipeline, and the air supply pipeline is connected with the air inlet end of the drying barrel and the air outlet end of the dehumidifying assembly; the air return pipeline is connected with the air outlet end of the drying barrel and the air inlet end of the dehumidification assembly, the air door actuator is arranged between the air supply pipeline and the air return pipeline and can control the opening degree of the air supply pipeline and the air return pipeline, the temperature detector is arranged on the air return pipeline and used for detecting the air return temperature, and the air door actuator is provided with a first heater. The first heater is located in the air supply pipeline. During working, the temperature detector detects the return air temperature, the air door actuator acts according to the return air temperature and controls the opening degree of the air supply pipeline and the air return pipeline so as to adjust the drying degree of the drying barrel to the plastic raw materials, different working conditions can be adapted, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic drying, and in particular to a two-color dehumidification and drying device and a control method thereof. Background Art

[0002] The two-color dehumidification dryer is a machine that can stably provide low dew point air and can dry two different raw materials at the same time. The high temperature and low dew point dry air provided by the two-color dehumidification dryer dries the plastic raw materials, effectively reducing the moisture content of the plastic raw materials, thereby reducing the defective rate of the products, meeting the production needs of two production lines at the same time, and the production needs of two raw materials on the same production line.

[0003] At present, the two-color dehumidification dryer can dry two different plastic raw materials at the same time. When the characteristics and output of the two plastic raw materials are inconsistent, the two-color dehumidification dryer cannot reasonably allocate the air volume according to the actual production line, resulting in a long drying time for the plastic raw materials, a high product defect rate and high energy consumption. Therefore, the current two-color dehumidification dryer can only be configured according to the needs of the production line, and is not capable of coping with changes in various working conditions and production line output. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a two-color dehumidification and drying device that can adapt to different working conditions and changes in production line output and effectively reduce energy consumption.

[0005] The present invention also proposes a control method applied to the above-mentioned two-color dehumidification and drying equipment.

[0006] A two-color dehumidifying and drying device according to a first embodiment of the present invention includes: Dehumidification components, used to dry the gas; Two groups of barrel assemblies, the barrel assemblies are used to dry plastic raw materials, the barrel assemblies include a drying barrel, a damper actuator, a temperature detector, an air supply duct and a return air duct, the air supply duct connects the air inlet end of the drying barrel and the air outlet end of the dehumidification assembly, the return air duct connects the air outlet end of the drying barrel and the air inlet end of the dehumidification assembly, the damper actuator is arranged between the air supply duct and the return air duct, and can control the opening of the air supply duct and the return air duct, the temperature detector is arranged in the return air duct, and is used to detect the return air temperature, the damper actuator is provided with a first heater, and the first heater is located in the air supply duct.

[0007] The two-color dehumidification and drying equipment according to the embodiment of the present invention has at least the following beneficial effects: two groups of barrel components are used to dry two kinds of plastic raw materials, the barrel components include a drying barrel, a damper actuator, a temperature detector, an air supply duct and a return air duct, the damper actuator is arranged between the air supply duct and the return air duct, and is used to control the opening of the two, the temperature detector is arranged in the return air duct, and is used to detect the return air temperature, the drying barrel has an air outlet end and an air inlet end, the dehumidification component also has an air outlet end and an air inlet end, the air supply duct is connected to the air inlet end of the drying barrel, and the air outlet end of the dehumidification component, the return air duct is connected to the air outlet end of the drying barrel, and the air inlet end of the dehumidification component, when working, the temperature detector detects the return air temperature, according to the return air temperature, the damper actuator is actuated and controls the opening of the air supply duct and the return air duct to adjust the drying degree of the plastic raw materials by the drying barrel, the two groups of barrel components are independently controlled, can adapt to different working conditions and changes in production line output, and effectively reduce energy consumption.

[0008] According to some embodiments of the present invention, the damper actuator is provided with a support, a driver, a rotating shaft, a first valve plate and a second valve plate, the support is used to fix the driver, as well as the supply air duct and the return air duct, the position of the supply air duct located at the damper actuator and the position of the return air duct located at the damper actuator are parallel to each other, the rotating shaft vertically passes through the supply air duct and the return air duct and is connected to the driver, the first valve plate is located in the supply air duct, and the second valve plate is located in the return air duct.

[0009] According to some embodiments of the present invention, the air supply ducts of the two groups of the barrel assemblies are connected, and the air outlet ends of the dehumidification assemblies are connected through a first duct, and the return air ducts of the two groups of the barrel assemblies are connected, and the air inlet ends of the dehumidification assemblies are connected through a second duct.

[0010] According to some embodiments of the present invention, the dehumidification component includes a honeycomb rotor, a first fan, a first cooler, a first filter, and a second cooler connected in sequence through pipes, and a second heater, a second fan, and a second filter connected in sequence through pipes, the air outlet end of the drying zone of the honeycomb rotor is connected to the air supply duct, the air inlet end of the second cooler is connected to the return air duct, and the air outlet end of the second heater is connected to the regeneration zone of the honeycomb rotor.

[0011] According to some embodiments of the present invention, a feeding assembly is further included, which includes a storage barrel, and a control valve, a third filter and a third fan connected in sequence through pipelines, the storage barrel is connected to the feeding end of the drying barrel through a pipeline, the air inlet end of the control valve is connected to the vacuum outlet of the drying barrel through a pipeline, the air outlet end of the third fan is connected to the vacuum inlet of the drying barrel through a pipeline, and the discharge end of the drying barrel is connected to the injection molding machine through a pipeline.

[0012] The control method according to the second aspect of the present invention comprises the steps of: Acquire a first return air temperature of the temperature detector; The damper actuator is controlled to operate according to the first return air temperature, the openings of the supply air duct and the return air duct are adjusted, and the heating temperature of the first heater is adjusted.

[0013] The control method according to the embodiment of the present invention has at least the following beneficial effects: obtaining the first return air temperature by using a temperature detector, and then controlling the operation of the damper actuator according to the first return air temperature, adjusting the opening of the supply air duct and the return air duct, and adjusting the heating temperature of the first heater, thereby realizing the switching of the drying mode in the drying barrel and effectively reducing energy consumption.

[0014] According to some embodiments of the present invention, controlling the damper actuator to operate according to the first return air temperature, adjusting the openings of the supply air duct and the return air duct, and adjusting the heating temperature of the first heater include the steps of: determining whether the first return air temperature is higher than a preset value according to the first return air temperature; When the first return air temperature is higher than the preset value, the damper actuator is controlled to operate and the air supply duct and the return air duct are lowered to a first opening, and the first heater is controlled to lower the heating temperature to a first temperature, so that the drying barrel enters an energy-saving mode; When in the energy-saving mode, the first return air temperature is higher than the preset value and lasts for a predetermined time, the damper actuator is controlled to operate and lower the supply air duct and the return air duct to a second opening, the first heater is controlled to lower the heating temperature to a second temperature, and the drying barrel enters the insulation mode, the second opening is smaller than the first opening, and the second temperature is smaller than the first temperature.

[0015] According to some embodiments of the present invention, the steps further include: When in the energy-saving mode, the first return air temperature is lower than the preset value, the damper actuator is controlled to operate and increase the supply air duct and the return air duct to a third fully opened opening, the first heater is controlled to increase the heating temperature to a third temperature, the third opening is greater than the first opening, and the third temperature is greater than the first temperature.

[0016] According to some embodiments of the present invention, the steps further include: When in the heat preservation mode, obtaining a second return air temperature of the temperature detector; determining whether the second return air temperature is higher than the preset value according to the second return air temperature; When the second return air temperature is higher than the preset value, the damper actuator is controlled to maintain the second opening of the supply air duct and the return air duct, and the first heater is controlled to maintain the heating temperature to the second temperature.

[0017] According to some embodiments of the present invention, the method of controlling the damper actuator to operate according to the return air temperature, adjusting the openings of the supply air duct and the return air duct, and adjusting the heating temperature of the first heater further includes the steps of: Determining whether the return air temperature is higher than a preset value according to the return air temperature; When the return air temperature is lower than the preset value, the damper actuator is controlled to maintain the supply air duct and the return air duct to a third fully opened degree, and the first heater is controlled to maintain the heating temperature to a third temperature.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram of a two-color dehumidification and drying device according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of a damper actuator of a two-color dehumidification and drying device is shown; Figure 3 A flow chart of a control method according to an embodiment of the present invention; Figure 4 for Figure 3 The detailed step flow chart of the first case of step S200 is shown; Figure 5 for Figure 3 The detailed step flow chart of the second situation of step S200 is shown; Figure 6 for Figure 4 A detailed step flow chart of one case of step S230 is shown; Figure 7 for Figure 3 Detailed step flow chart of the third case of step S200 is shown.

[0020] Reference numerals: Drying barrel 1, damper actuator 2, temperature detector 3, air supply duct 4, return air duct 5, first duct 6, second duct 7, first heater 8, honeycomb rotor 9, first fan 10, first cooler 11, second cooler 12, first filter 13, second filter 14, second heater 15, second fan 16, storage barrel 17, control valve 18, third filter 19, third fan 20, injection molding machine 21, driver 22, first valve plate 23, second valve plate 24, rotating shaft 25. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first", "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] The two-color dehumidification dryer is a machine that can stably provide low dew point air and can dry two different raw materials at the same time. The high temperature and low dew point dry air provided by the two-color dehumidification dryer dries the plastic raw materials, effectively reducing the moisture content of the plastic raw materials, thereby reducing the defective rate of the products, meeting the production needs of two production lines at the same time, and the production needs of two raw materials on the same production line.

[0026] At present, the two-color dehumidification dryer can dry two different plastic raw materials at the same time. When the characteristics and output of the two plastic raw materials are inconsistent, the two-color dehumidification dryer cannot reasonably allocate the air volume according to the actual production line, resulting in a long drying time for the plastic raw materials, a high product defect rate and high energy consumption. Therefore, the current two-color dehumidification dryer can only be configured according to the needs of the production line, and is not capable of coping with changes in various working conditions and production line output.

[0027] In response to the above technical problems, the present invention proposes a two-color dehumidification and drying equipment having two groups of barrel assemblies. The two groups of barrel assemblies dry different plastic raw materials respectively. Each group of barrel assemblies independently controls the air intake and return air through a damper actuator, which can adapt to different working conditions and changes in production line output, and effectively reduce energy consumption.

[0028] The following is combined with Figures 1 to 7 A two-color dehumidification and drying device and a control method thereof according to an embodiment of the present invention are described.

[0029] Reference Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the two-color dehumidification and drying equipment includes a dehumidification component, two groups of barrel components, two groups of feeding components and an injection molding machine 21. The two groups of barrel components work independently, the dehumidification component conveys dry gas to the two groups of barrel components respectively, one group of feeding components corresponds to one group of barrel components, the injection molding machine 21 has two injection ports, and one group of barrel components feeds material to one injection port. Since the two groups of barrel components work independently, the dryness of the input gas and the temperature of the input gas can be adjusted respectively, improving energy utilization efficiency and reducing energy consumption.

[0030] It should be noted that in the embodiment of the present invention, the dehumidification component is used to dry the gas discharged from the barrel component. The two groups of barrel components each include an air supply duct 4 and a return air duct 5, and the dehumidification component includes a honeycomb rotor 9, a first fan 10, a first cooler 11, a first filter 13 and a second cooler 12 connected in sequence through pipelines, and a second heater 15, a second fan 16 and a second filter 14 connected in sequence through pipelines, the air outlet end of the drying zone of the honeycomb rotor 9 is connected to the air supply duct 4, the air inlet end of the second cooler 12 is connected to the return air duct 5, and the air outlet end of the second heater 15 is connected to the regeneration zone of the honeycomb rotor 9. The drying zone is used to dry the gas, and the regeneration zone is used to reduce the molecular sieve transferred from the drying zone, that is, to discharge the moisture in the molecular sieve.

[0031] It is understandable that when the dehumidification component is working, the drying area of ​​the honeycomb rotor 9 continues to dry the gas transported by the return air duct 5. Specifically, the humid gas is driven by the first fan 10 and input into the second cooler 12 from the return air duct 5, and then filtered by the first filter 13, enters the first cooler 11 for cooling, and then enters the drying area of ​​the honeycomb rotor 9. After the molecular sieve in the drying area absorbs moisture, it is output and finally enters the air supply duct 4. It is worth noting that part of the output dry gas will be sent back to the front end of the first cooler 11 for cooling and then re-input into the honeycomb rotor 9. This is to cool the honeycomb rotor 9 and maintain the molecular sieve's ability to absorb moisture, because the molecular sieve's ability to absorb moisture will be affected by temperature.

[0032] In addition, after the molecular sieve in the drying area of ​​the honeycomb rotor 9 continues to work, the molecular sieve reaches saturation, the absorption capacity decreases, and it will be transferred to the regeneration area. The external dry gas enters the second filter 14 driven by the second fan 16, enters the regeneration area after being heated by the second heater 15, absorbs the moisture of the molecular sieve in the regeneration area, and realizes reduction. The dehumidification component has a high drying efficiency.

[0033] It should be noted that, in an embodiment of the present invention, the barrel assembly is used to dry plastic raw materials, and the barrel assembly includes a drying barrel 1, a damper actuator 2, a temperature detector 3, an air supply duct 4 and a return air duct 5. The air supply duct 4 connects the air inlet end of the drying barrel 1 and the air outlet end of the dehumidification assembly, and the return air duct 5 connects the air outlet end of the drying barrel 1 and the air inlet end of the dehumidification assembly. The damper actuator 2 is arranged between the air supply duct 4 and the return air duct 5, and can control the opening of the air supply duct 4 and the return air duct 5. The temperature detector 3 is arranged in the return air duct 5 and is used to detect the return air temperature. The damper actuator 2 is provided with a first heater 8, and the first heater 8 is located in the air supply duct 4.

[0034] It can be understood that when the barrel assembly is working, the dry gas input from the dehumidification assembly passes through the damper actuator 2, is heated by the first heater 8, and then enters the drying barrel 1 to dry the plastic raw material. After drying is completed, it flows out from the air outlet end of the drying barrel 1 and enters the return air duct 5.

[0035] In addition, the damper actuator 2 is provided with a support, a driver 22, a rotating shaft 25, a first valve disc 23 and a second valve disc 24. The support is used to fix the driver 22, and the air supply duct 4 and the return air duct 5. The position of the air supply duct 4 at the damper actuator 2 and the position of the return air duct 5 at the damper actuator 2 are parallel to each other. The rotating shaft 25 vertically passes through the air supply duct 4 and the return air duct 5 and is connected to the driver 22. The first valve disc 23 is located in the air supply duct 4, and the second valve disc 24 is located in the return air duct 5. The damper actuator 2 can simultaneously control the opening of the air supply duct 4 and the return air duct 5 through the first valve disc 23 and the second valve disc 24, saving costs and improving efficiency.

[0036] In addition, the air supply ducts 4 of the two groups of barrel assemblies are connected, and connected to the air outlet of the dehumidification assembly through the first duct 6, and the return air ducts 5 of the two groups of barrel assemblies are connected, and connected to the air inlet of the dehumidification assembly through the second duct 7. This design can realize that one group of dehumidification assemblies can simultaneously input dry gas to two groups of barrel assemblies, saving costs and high efficiency.

[0037] It should be noted that, in the embodiment of the present invention, the feeding assembly includes a storage barrel 17, and a control valve 18, a third filter 19 and a third fan 20 connected in sequence through pipelines, the storage barrel 17 is connected to the feeding end of the drying barrel 1 through a pipeline, the air inlet end of the control valve 18 is connected to the vacuum outlet of the drying barrel 1 through a pipeline, the air outlet end of the third fan 20 is connected to the vacuum inlet of the drying barrel through a pipeline, and the discharge end of the drying barrel 1 is connected to the injection molding machine 21 through a pipeline.

[0038] It can be understood that, driven by the third fan 20, negative pressure is generated in the drying barrel 1 and the injection molding machine 21, and the plastic raw material in the storage barrel 17 enters the drying barrel 1 from the storage barrel 17 driven by the air pressure, and the plastic raw material in the drying barrel 1 enters the injection molding machine 21 from the drying barrel 1 driven by the air pressure, forming a cycle to realize automatic feeding.

[0039] Reference Figure 3 As shown, in an embodiment of the present invention, the control method applied to the above-mentioned two-color dehumidification and drying equipment includes the steps of: S100: Obtaining the first return air temperature of the temperature detector 3; S200: Controlling the damper actuator 2 to operate according to the first return air temperature, adjusting the openings of the supply air duct 4 and the return air duct 5, and adjusting the heating temperature of the first heater 8.

[0040] It should be noted that when the first return air temperature increases, the damper actuator 2 will reduce the opening of the air supply duct 4 and the return air duct 5, reduce the heating temperature of the first heater 8, so that the amount of dry air entering the drying barrel 1 is reduced, and the amount of air sent out of the drying barrel 1 is also reduced, thereby making the drying barrel 1 have a certain degree of insulation effect, saving energy consumption. On the contrary, when the first return air temperature decreases, it means that the drying temperature in the drying barrel 1 is insufficient, the moisture absorption effect of the dry air is reduced, and the dry air volume needs to be supplemented and the temperature of the dry air is increased. The damper actuator 2 will increase the opening of the air supply duct 4 and the return air duct 5, and the first heater 8 will increase the heating temperature, so that the amount of dry air entering the drying barrel 1 is increased, and the amount of air sent out of the drying barrel 1 is also increased, thereby making the dry air with a lower temperature in the drying barrel 1 discharged as soon as possible, and the dry air with a high temperature is added to the drying barrel 1 as soon as possible, improving the drying effect in the drying barrel 1.

[0041] Reference Figure 4As shown, in this embodiment of the present invention, step S200 further includes the steps of: S210: judging whether the first return air temperature is higher than a preset value according to the first return air temperature; S220: When the first return air temperature is higher than the preset value, the damper actuator 2 is controlled to operate and reduce the air supply duct 4 and the return air duct 5 to the first opening, and the first heater 8 is controlled to reduce the heating temperature to the first temperature, so that the drying barrel 1 enters the energy-saving mode; S230: When in energy-saving mode, the first return air temperature is higher than the preset value and lasts for a predetermined time, the damper actuator 2 is controlled to operate and lower the supply air duct 4 and the return air duct 5 to the second opening, the first heater 8 is controlled to lower the heating temperature to the second temperature, and the drying barrel 1 enters the insulation mode, the second opening is smaller than the first opening, and the second temperature is smaller than the first temperature.

[0042] It should be noted that the preset value is a temperature set according to the characteristics of the plastic raw material so that the plastic raw material has good dehumidification performance and low energy consumption, which is a preferred temperature value or temperature range. For example, for PC material, the preset value can be set to 120 degrees Celsius, and the dry air at this temperature has good drying performance for PC material. The preset value of the first return air temperature is automatically adjusted according to the drying temperature setting value. For example, when the drying temperature is set to 120 degrees Celsius, the corresponding return air temperature preset value is 65 degrees Celsius.

[0043] In addition, in the energy-saving mode, for example, the damper actuator 2 adjusts the angle of the first valve plate 23 and the second valve plate 24 to 60°, and the air volume is reduced by 50%. In the heat preservation mode, the damper actuator 2 adjusts the angle of the first valve plate 23 and the second valve plate 24 to 85°, and the air volume is reduced by 90%.

[0044] In addition, the preset time can be set to 4 hours, that is, in energy-saving mode, the first return air temperature is higher than the preset value and lasts for 4 hours, the damper actuator 2 adjusts the angle to 85°, the air volume is reduced by 90%, and switches to insulation mode.

[0045] Reference Figure 5 As shown, in this embodiment of the present invention, step S200 further includes the steps of: S240: When in energy-saving mode, the first return air temperature is lower than the preset value, the damper actuator 2 is controlled to operate and increase the supply air duct 4 and the return air duct 5 to a third fully opened opening, and the first heater 8 is controlled to increase the heating temperature to a third temperature, the third opening is greater than the first opening, and the third temperature is greater than the first temperature.

[0046] It should be noted that the third opening is the opening of the damper actuator 2 in the general mode, and the drying air volume and the drying temperature are operated at 100%.

[0047] Reference Figure 6As shown, in this embodiment of the present invention, step S230 further includes the steps of: S231: When in the heat preservation mode, obtaining the second return air temperature of the temperature detector 3; S232: Determine whether the second return air temperature is higher than a preset value according to the second return air temperature; S233: When the second return air temperature is higher than the preset value, the damper actuator 2 is controlled to maintain the second opening of the supply air duct 4 and the return air duct 5, and the first heater 8 is controlled to maintain the heating temperature to the second temperature.

[0048] It should be noted that, in the heat preservation mode, the drying temperature in the drying barrel 1 is 40 degrees Celsius lower than the preset value.

[0049] Reference Figure 7 As shown, in this embodiment of the present invention, step S200 further includes the steps of: S250: judging whether the return air temperature is higher than a preset value according to the return air temperature; S260: When the return air temperature is lower than a preset value, the damper actuator 2 is controlled to maintain the supply air duct 4 and the return air duct 5 to a third fully open degree, and the first heater 8 is controlled to maintain the heating temperature at a third temperature.

[0050] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A two-color dehumidification and drying equipment, It is characterized in that include: Dehumidification components, used to dry the gas; Two groups of barrel assemblies, the barrel assemblies are used to dry plastic raw materials, the barrel assemblies include a drying barrel, a damper actuator, a temperature detector, an air supply duct and a return air duct, the air supply duct connects the air inlet end of the drying barrel and the air outlet end of the dehumidification assembly, the return air duct connects the air outlet end of the drying barrel and the air inlet end of the dehumidification assembly, the damper actuator is arranged between the air supply duct and the return air duct, and can control the opening of the air supply duct and the return air duct, the temperature detector is arranged in the return air duct, and is used to detect the return air temperature, the damper actuator is provided with a first heater, and the first heater is located in the air supply duct.

2. A two-color dehumidification and drying device according to claim 1, It is characterized in that The damper actuator is provided with a support, a driver, a rotating shaft, a first valve plate and a second valve plate, the support is used to fix the driver, as well as the supply air duct and the return air duct, the position of the supply air duct at the damper actuator and the position of the return air duct at the damper actuator are parallel to each other, the rotating shaft vertically passes through the supply air duct and the return air duct and is connected to the driver, the first valve plate is located in the supply air duct, and the second valve plate is located in the return air duct.

3. A two-color dehumidification and drying device according to claim 1, It is characterized in that The air supply ducts of the two groups of barrel assemblies are connected, and are connected to the air outlet end of the dehumidification assembly through a first duct; the air return ducts of the two groups of barrel assemblies are connected, and are connected to the air inlet end of the dehumidification assembly through a second duct.

4. A two-color dehumidification and drying device according to claim 1, It is characterized in that The dehumidification component includes a honeycomb rotor, a first fan, a first cooler, a first filter, and a second cooler connected in sequence through pipes, and a second heater, a second fan, and a second filter connected in sequence through pipes, the air outlet end of the drying zone of the honeycomb rotor is connected to the air supply duct, the air inlet end of the second cooler is connected to the return air duct, and the air outlet end of the second heater is connected to the regeneration zone of the honeycomb rotor.

5. A two-color dehumidification and drying device according to claim 1, It is characterized in that It also includes a feeding assembly, which includes a storage barrel, and a control valve, a third filter and a third fan connected in sequence through pipelines. The storage barrel is connected to the feeding end of the drying barrel through a pipeline, the air inlet end of the control valve is connected to the vacuum outlet of the drying barrel through a pipeline, the air outlet end of the third fan is connected to the vacuum inlet of the drying barrel through a pipeline, and the discharge end of the drying barrel is connected to the injection molding machine through a pipeline.

6. A control method, applied to a two-color dehumidification and drying device according to any one of claims 1 to 5, It is characterized in that The control method comprises the steps of: Acquire a first return air temperature of the temperature detector; The damper actuator is controlled to operate according to the first return air temperature, the openings of the supply air duct and the return air duct are adjusted, and the heating temperature of the first heater is adjusted.

7. The control method according to claim 6, It is characterized in that The method of controlling the damper actuator to operate according to the first return air temperature, adjusting the opening of the air supply duct and the return air duct, and adjusting the heating temperature of the first heater comprises the following steps: determining whether the first return air temperature is higher than a preset value according to the first return air temperature; When the first return air temperature is higher than the preset value, the damper actuator is controlled to operate and the air supply duct and the return air duct are lowered to a first opening, and the first heater is controlled to lower the heating temperature to a first temperature, so that the drying barrel enters an energy-saving mode; When in the energy-saving mode, the first return air temperature is higher than the preset value and lasts for a predetermined time, the damper actuator is controlled to operate and lower the supply air duct and the return air duct to a second opening, the first heater is controlled to lower the heating temperature to a second temperature, and the drying barrel enters the insulation mode, the second opening is smaller than the first opening, and the second temperature is smaller than the first temperature.

8. The control method according to claim 7, It is characterized in that Also includes the steps: When in the energy-saving mode, the first return air temperature is lower than the preset value, the damper actuator is controlled to operate and increase the supply air duct and the return air duct to a third fully opened opening, the first heater is controlled to increase the heating temperature to a third temperature, the third opening is greater than the first opening, and the third temperature is greater than the first temperature.

9. The control method according to claim 7, It is characterized in that Also includes the steps: When in the heat preservation mode, obtaining a second return air temperature of the temperature detector; determining whether the second return air temperature is higher than the preset value according to the second return air temperature; When the second return air temperature is higher than the preset value, the damper actuator is controlled to maintain the second opening of the supply air duct and the return air duct, and the first heater is controlled to maintain the heating temperature to the second temperature.

10. The control method according to claim 6, It is characterized in that The method of controlling the damper actuator to operate according to the return air temperature, adjusting the opening of the air supply duct and the return air duct, and adjusting the heating temperature of the first heater, further includes the steps of: Determining whether the return air temperature is higher than a preset value according to the return air temperature; When the return air temperature is lower than the preset value, the damper actuator is controlled to maintain the supply air duct and the return air duct to a third fully opened degree, and the first heater is controlled to maintain the heating temperature to a third temperature.

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