Freezing dryer for powder coating

Abstract

The utility model discloses a freezing dryer for powder coating. The freezing dryer comprises a dryer body, an air conditioner, a vacuum pump, a discharging hopper, a control unit, a distributing device, a tray, a temperature measuring device and an air heater. An air cooler and an air heater are respectively arranged above the top and at the bottom of the machine body, and descending of cold air and ascending of hot air are respectively beneficial to freezing and drying processes; the distributor is arranged to uniformly distribute and spread the raw materials on the tray, so that the raw materials are prevented from being accumulated on the tray; a plurality of air holes are symmetrically and uniformly distributed on the tray at equal intervals to facilitate penetration of cold air and hot air; freezing and drying processes are accelerated, and efficiency is improved. The cold air port, the hot air port and the extraction opening of the vacuum pump are far away from the raw materials without blowing or extracting the raw materials; and a control unit is arranged to realize automatic control of freezing and drying. The utility model solves the problem that the process and time of respectively freezing and drying raw materials at the upper part and the lower part in the machine body are prolonged; meanwhile, blanking, freezing and drying are combined, and the process is optimized.

Description

Technical Field

[0001] This utility model relates to the field of powder coating processing technology, specifically to a cold dryer for powder coatings. Background Technology

[0002] The basic principle of freeze-drying is based on the three states of water. Water exists in solid, liquid, and gaseous states, which can interconvert and coexist. When water is at its triple point (temperature 0.01℃, vapor pressure 610.5Pa), water, ice, and water vapor can coexist and maintain equilibrium. A freeze dryer consists of a refrigeration system, a vacuum system, a heating system, and an electrical instrumentation control system. Its main components include a drying chamber, condenser, refrigeration unit, vacuum pump, and heating / cooling devices. Its working principle involves first freezing the item to be dried below its triple point temperature, causing the moisture in the material to rapidly freeze into solid ice crystals. Then, under vacuum conditions, these solid ice crystals sublimate directly into water vapor and are discharged, thus drying the item.

[0003] For example, Chinese invention patent CN220567654U, published on March 8, 2024, discloses a freeze dryer, including a freeze dryer body and an upper equipment shell. A base structure is provided on the lower outer side of the freeze dryer body. Several mounting slots are opened inside the equipment shell. A refrigeration unit and a hot air blower are respectively installed in the mounting slots on both sides. Cold air inlets and hot air inlets are fixedly installed on both sides inside the freeze dryer body. The cold air inlets are connected to the output end of the refrigeration unit through a cold air pipe, and the hot air inlets are connected to the output end of the hot air blower through a heat pipe. This device uses a rotating motor, a connecting rod, a sleeve, and a placement mechanism. As the rotating motor rotates, it drives the connecting rod to rotate. When the connecting rod rotates, the sleeve threaded to it moves up and down on it. The movement of the sleeve indirectly adjusts the position of the placement mechanism, which facilitates uniform freezing and drying of raw materials on different placement plates and improves work efficiency.

[0004] As can be seen from the above patents, although the freeze dryer can achieve uniform freezing and drying, the hot fluid rises and the cold fluid falls, and the cold air inlet and hot air outlet are respectively located on both sides of the body. This will prolong the freezing and drying process and time of the raw materials at the top and bottom of the body, and make it easy for the raw materials near the cold air inlet and hot air outlet to be blown away. In addition, the air pump located on the side of the body can easily suck up the raw materials when pumping air. Therefore, the freeze dryer needs to be redesigned and improved. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a refrigerated dryer for powder coatings.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A refrigerated dryer for powder coatings includes a body, a cooler, a vacuum pump and a hopper are arranged on the top of the body, a control unit is arranged on the outer wall of the body, a distributor, a tray and a temperature measuring device are arranged in sequence from top to bottom inside the body, and a hot air blower and a support are arranged at the bottom of the body.

[0008] Preferably, a solenoid valve is provided at the connection between the bottom of the hopper and the material distributor, and the air cooler is connected to the solenoid valve through a pipe.

[0009] Preferably, a vacuum valve and a hot air valve are respectively installed at the connection points between the vacuum pump and the hot air blower and the machine body.

[0010] Preferably, the temperature measuring device, solenoid valve, hot air valve, and vacuum valve are electrically connected to the control unit.

[0011] Preferably, the tray is a multi-layered tray arranged from bottom to top inside the machine body, with several mounting blocks arranged on the top and bottom of each tray, and each tray is inserted into the mounting slot between the mounting blocks for fixation.

[0012] Preferably, the tray has a number of air holes evenly and symmetrically distributed at equal intervals.

[0013] Preferably, the front of the machine body has two door panels.

[0014] The beneficial effects of this utility model are:

[0015] A cold air blower and a hot air blower are respectively installed at the top and bottom of the machine body. The downward movement of cold air and the upward movement of hot air facilitate the freezing and drying processes, solving the problem of prolonged freezing and drying times for raw materials at the top and bottom of the machine body. A material distributor evenly distributes the raw materials on the trays to prevent accumulation. Several symmetrically distributed air holes at equal intervals on the trays facilitate the passage of cold and hot air, accelerating the freezing and drying process and improving efficiency. The cold air inlets, hot air inlets, and vacuum pump exhaust ports are located far from the raw materials to prevent them from being blown away or sucked away. A control unit is installed to automate the freezing and drying process, and simultaneously combines feeding, freezing, and drying to optimize the process. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Figure 1 This is a schematic diagram of the planar structure of a refrigerated dryer for powder coatings proposed in this utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of a refrigerated dryer for powder coatings proposed in this utility model;

[0020] Figure 1 As shown: 1. Machine body, 2. Air conditioner, 3. Vacuum pump, 4. Feed hopper, 5. Control unit, 6. Fabric distributor, 7. Tray, 8. Temperature measuring device, 9. Hot air blower, 10. Bracket, 11. Solenoid valve, 12. Hot air valve, 13. Vacuum valve, 14. Mounting block, 15. Air hole.

[0021] Figure 2 As shown: 1. Body, 16. Door panel. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0025] It should be noted that similar labels and letters are likely to represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Reference Figure 1 This utility model discloses a refrigerated dryer for powder coatings, comprising a body 1, a hopper 4 disposed at the center of the top of the body 1 for conveying raw materials into the body 1; a cooler 2 and a vacuum pump 3 disposed on the left and right sides of the top of the body 1, respectively, for generating cool air and removing gas from the body 1; a distributor 6 disposed directly below the hopper 4 for evenly distributing the raw materials from the hopper 4 onto a tray 7 below to prevent accumulation of raw materials on the tray 7; and a solenoid valve 11 disposed at the connection between the bottom of the hopper 4 and the distributor 6 to control the cooling... Machine 2 is connected to solenoid valve 11 via a pipe. Solenoid valve 11 is used to control the connection between fabric distributor 6, air cooler 2, and hopper 4. Vacuum valve 13 is installed at the air extraction port of vacuum pump 3 connected to machine body 1 to control the connection between vacuum pump 3 and machine body 1. Hot air blower 9 is installed at the center of the bottom of machine body 1 to generate hot air. Hot air valve 12 is installed at the hot air outlet of hot air blower 9 connected to machine body 1 to control the connection between hot air blower 9 and machine body 1. Several brackets 10 are installed at the bottom edge of machine body 1 to support machine body 1.

[0029] In an optional embodiment, the machine body 1 has multiple layers of trays 7 arranged from bottom to top inside for storing raw materials to be processed. The multiple layers of trays facilitate the processing of a large amount of raw materials at one time. Each tray 7 has several mounting blocks 14 arranged above and below it. Each tray 7 is inserted into the mounting groove between the mounting blocks 14 for fixing. Several air holes 15 are evenly distributed symmetrically at equal intervals on the tray 7, which is conducive to the passage of cold air and hot air, and facilitates the freezing and drying of the raw materials on the tray 7.

[0030] In an optional embodiment, a temperature measuring device 8 is provided at the center of the tray 7 in the middle of the body 1 for real-time detection of the temperature inside the body 1; the temperature measuring device 8, the solenoid valve 11, the hot air valve 12 and the vacuum valve 13 are electrically connected to the control unit 5 respectively, and the control unit controls the connection state of the solenoid valve 11, the hot air valve 12 and the vacuum valve 13.

[0031] In an optional embodiment, two door panels 16 are provided at the front of the machine body 1 to facilitate the removal of the cooled raw materials.

[0032] The working process of this utility model is as follows:

[0033] Material spreading process: Start the control system 5, close the hot air valve 12 and vacuum valve 13, open the solenoid valve 11 to connect the hopper 4 and the material spreader 6; after opening the door panel 16, start feeding. The raw material falls from the hopper 4 to the material spreader 6 through the solenoid valve 11. The material spreader 6 evenly distributes the raw material on the top tray 7. After a layer of raw material is spread on the top tray 7, remove the tray and insert it into the bottom mounting slot. Then place another tray on the top layer to continue spreading the material until all trays 7 are covered with raw material. Close the solenoid valve 11 to disconnect the hopper 4 and the material spreader 6; after closing the door panel 16, start the raw material freezing process.

[0034] Freezing process: Control system 5 opens solenoid valve 11, connecting air cooler 2 to fabric distributor 6. Cold air from air cooler 2 passes through solenoid valve 11 and fabric distributor 6 in sequence, and is evenly distributed inside the machine body 1, freezing the raw materials on tray 7 from top to bottom. On tray 7, cold air freezes the upper surface of the raw materials, and at the bottom of tray 7, cold air passes through air holes 15 to freeze the lower surface of the raw materials. Freezing the upper and lower surfaces of the raw materials simultaneously can accelerate the freezing process, causing the moisture in the raw materials to quickly freeze into solid ice crystals. Temperature measuring device 8 monitors the temperature inside the machine body 1 in real time. When the temperature reaches 0℃ and remains there for 5-10 minutes, solenoid valve 11 is closed, preparing for the drying process of the raw materials.

[0035] Drying process: Control system 5 opens vacuum valve 13, connecting vacuum pump 3 to machine body 1. Vacuum pump 3 extracts gas from machine body 1, reducing the vacuum level inside machine body 1. Solid ice crystals in the raw materials on tray 7 slowly sublimate into water vapor and are drawn away by vacuum pump 3, maintaining the vacuum level inside machine body 1. At the same time, control system 5 opens hot air valve 12, connecting hot air blower 9 to machine body 1. Hot air from hot air blower 9 enters machine body 1 through hot air valve 12, heating and drying the raw materials on tray 7 from bottom to top, accelerating the sublimation process of solid ice crystals while drying the raw materials. After vacuum pump 3 maintains the vacuum level for 5-10 minutes, hot air valve 12 and vacuum valve 13 are closed in sequence. Then control unit 5 is turned off, door panel 16 is opened to remove the cooled and dried raw materials, completing the material spreading, freezing and drying process.

[0036] Of course, the embodiments described in this specific implementation are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A cold dryer for powder coatings, comprising a machine body (1), characterized in that: The cold air machine (2), the vacuum pump (3) and the lower hopper (4) are arranged above the top of the machine body (1), the control unit (5) is arranged on the outer wall of the machine body (1), the machine body (1) is sequentially provided with the material distributor (6), the tray (7) and the temperature measuring device (8) from top to bottom, and the hot air machine (9) and the support (10) are arranged at the bottom of the machine body (1).

2. A cold drying machine for powder coatings according to claim 1, characterized in that: The electromagnetic valve (11) is arranged at the connecting position of the lower hopper (4) bottom and the material distributor (6), and the cold air machine (2) is connected with the electromagnetic valve (11) through a pipeline.

3. A cold drying machine for powder coatings according to claim 1, characterized in that: The vacuum valve (13) and the hot air valve (12) are arranged at the connecting position of the vacuum pump (3) and the hot air machine (9) and the machine body (1) respectively.

4. A cold drying machine for powder coatings according to claim 1, characterized in that: The temperature measuring device (8), the electromagnetic valve (11), the hot air valve (12) and the vacuum valve (13) are electrically connected with the control unit (5) respectively.

5. A cold drying machine for powder coatings according to claim 1, characterized in that: The tray (7) is a plurality of layers of trays arranged from bottom to top in the machine body (1), a plurality of mounting blocks (14) are arranged on each tray, and each tray (7) is fixed by being inserted into the mounting groove between the mounting blocks (14).

6. A cold drying machine for powder coatings according to claim 1, characterized in that: A plurality of air holes (15) are uniformly and symmetrically distributed on the tray (7).

7. A cold drying machine for powder coatings according to claim 1, characterized in that: Two door plates (16) are arranged at the front of the machine body (1).

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