Automatic heat pump drying device for powdered feed

Abstract

The present application relates to feed processing equipment technical field, especially to a kind of automatic heat pump drying equipment of powdery feed, including drying box body, first chain mesh belt conveying line is equipped in the inside of drying box body near bottom, second chain mesh belt conveying line is equipped near top;The side of first chain mesh belt conveying line is equipped with heating mechanism, the air outlet direction of heating mechanism intersects or is perpendicular to conveying direction;Drying box body top is equipped with cloth bag dust removal mechanism, cloth bag dust removal mechanism air inlet is communicated with the top of drying box body;Outlet is communicated with heating mechanism by heat pump circulation system;To form complete closed heat pump circulation.The present application makes powder suspended heating by transverse hot air, effectively solves the problem that the drying efficiency of existing heat pump drying equipment is low, and hot air and powder contact effect is not good;At the same time, top mesh belt intercepts dust, reduces material loss and prevents equipment from being blocked, to realize energy saving and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of feed processing equipment technology, and in particular to an automatic heat pump drying device for powdered feed. Background Technology

[0002] Feed production refers to the process of mixing and processing various raw materials to make feed suitable for different animals. Its production process usually includes raw material cleaning, crushing, mixing, pelleting, drying, and packaging.

[0003] Currently, rotary drum dryers are commonly used for feed drying. These machines directly release hot air containing feed scraps and water vapor into the atmosphere after drying, causing air pollution. However, with the development of heat pump technology, heat pump drying equipment is gradually being applied in the feed processing field due to its energy-saving and environmentally friendly characteristics. For example, patent CN120466977A discloses a multi-layer belt powder drying and sorting integrated equipment, which includes a feeding system, a drying chamber, a closed-loop hot air circulation system, a dust collector, and a sorting machine. The dust collector is located at the exhaust port of the drying chamber. The drying chamber is a sealed chamber with an internal negative pressure environment. Multiple layers of mesh belts are arranged at intervals from top to bottom inside the drying chamber, with each layer conveying the material in an S-shape. A feeding port is located at the top of the drying chamber, and the feeding system is connected to the feeding port. A discharge port is located at the bottom of the drying chamber, and the sorting machine is connected to the discharge port at the bottom of the drying chamber for sorting the dried material. The closed-loop hot air circulation system is used to heat the drying chamber and recover heat from the moisture in the drying air.

[0004] However, there are still many technical defects in processing powdered feed: On the one hand, the heat pump drying equipment mostly adopts the method of vertical hot air penetrating the material layer for drying, that is, the hot air needs to penetrate multiple layers of mesh belts and material layers from bottom to top, which results in limited contact efficiency between hot air and powder, low heat and mass transfer efficiency, long drying cycle and high energy consumption; on the other hand, powdered feed is light and easy to fly, and a large amount of dust enters the evaporator of the heat pump system with the airflow during the hot air circulation process, which not only causes material loss, but also causes evaporator fin blockage and scaling, seriously affecting heat exchange efficiency, and even causing equipment failure and shutdown. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic heat pump drying device for powdered feed, which aims to solve the problems of low drying efficiency, poor contact between hot air and powder, and easy clogging of the heat pump system by dust in the existing heat pump drying equipment. By optimizing the coordinated design of hot air flow direction and material conveying method, the invention achieves efficient, continuous and clean drying of powdered feed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic heat pump drying device for powdered feed includes: The drying chamber is a sealed chamber that creates a negative pressure environment inside; The material conveying mechanism includes a first chain mesh belt conveyor line located near the bottom of the drying chamber and a second chain mesh belt conveyor line located near the top of the drying chamber. The first chain mesh belt conveyor line is used to carry and convey powdered feed, and the second chain mesh belt conveyor line is used to block and receive dust carried by the airflow. A heating mechanism is installed on both sides of the first chain mesh belt conveyor line to blow away and lift powdered feed; the air outlet direction of the heating mechanism is intersecting or perpendicular to the conveying direction of the first chain mesh belt conveyor line. A bag filter is installed at the top of the drying chamber to collect and filter dust particles that rise with the airflow. The air inlet of the bag filter is connected to the air outlet at the top of the drying chamber. A heat pump circulation system is used to dehumidify, heat, and recycle the gas inside the drying chamber. The heat pump circulation system includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence through refrigerant pipelines. The inlet end of the evaporator is connected to the exhaust end of the bag filter mechanism, and the outlet end is connected to the inlet end of the condenser through the compressor. The outlet end of the condenser is connected to the air duct of the heating mechanism to form a complete closed-loop heat pump cycle.

[0007] Preferably, the first chain mesh belt conveyor line and the second chain mesh belt conveyor line extend along the length direction of the drying chamber, and the conveying direction of the first chain mesh belt conveyor line is opposite to that of the second chain mesh belt conveyor line.

[0008] Preferably, the first chain conveyor belt includes a first drive motor, a first drive sprocket, a first driven sprocket, and a first stainless steel mesh belt arranged around the first drive sprocket and the first driven sprocket; the second chain conveyor belt includes a second drive motor, a second drive sprocket, a second driven sprocket, and a second stainless steel mesh belt arranged around the second drive sprocket and the second driven sprocket.

[0009] Preferably, the mesh size of the first stainless steel mesh belt is 0.5mm-2mm; and the mesh size of the second stainless steel mesh belt is 0.2mm-0.8mm.

[0010] Preferably, a dust collection chute is provided below the receiving end of the second chain mesh belt conveyor, and the bottom of the dust collection chute is connected to the first chain mesh belt conveyor through a return pipe.

[0011] Preferably, the heating mechanism includes a centrifugal fan and an air distribution plate. The centrifugal fan is fixedly connected to the bottom of the drying chamber, and the air inlet of the centrifugal fan is connected to the air outlet of the condenser. The air distribution plate is arranged along the width direction of the first chain mesh belt conveyor line, and multiple air outlet holes are evenly distributed on the air distribution plate.

[0012] Preferably, the bag filter dust collection mechanism includes a dust collection box, a filter bag assembly, a pulse cleaning assembly, and an induced draft fan. The dust collection box is fixedly connected to the top of the drying box. The filter bag assembly is disposed inside the dust collection box and is composed of multiple high-temperature resistant needle-punched felt filter bags. The nozzle of the pulse cleaning assembly is arranged opposite to the bag opening of the filter bag and is used to periodically blow compressed air to remove dust adhering to the surface of the filter bag. The inlet of the induced draft fan is connected to the clean air chamber of the dust collection box, and the outlet is connected to the air inlet of the evaporator.

[0013] Preferably, the pulse cleaning assembly includes an air tank, a pulse valve, and a blowpipe. The air tank is connected to the blowpipe via a high-pressure hose. The pulse valve is located on the pipeline between the air tank and the blowpipe. The blowpipe is arranged horizontally above the filter bag assembly, and a nozzle is provided on the blowpipe corresponding to the opening of each filter bag. The spray angle of the nozzle is set downward.

[0014] Preferably, a feeding mechanism is provided on one side of the drying chamber and a discharging mechanism is provided on the other side; the discharging end of the feeding mechanism is connected to the drying chamber and is used to transport the powdered feed to the receiving end of the first chain mesh belt conveyor line; the infeed end of the discharging mechanism is connected to the drying chamber and is used to receive and transport the dried powdered feed.

[0015] Preferably, both the feeding mechanism and the discharging mechanism are screw conveyors, and a rotary valve is provided at the connection between the shell of the screw conveyor and the drying chamber to control the quantitative conveying of materials and prevent air pressure exchange.

[0016] In summary, the beneficial effects of the present invention are as follows: 1. This invention, by setting a single-layer chain mesh belt conveyor line inside the drying chamber and installing multiple hot air components on its side, allows hot air to be blown laterally towards the powdered feed, dispersing and lifting it. This achieves full contact between the powder and the hot air in a suspended state, resulting in uniform heating and significantly improving drying efficiency. This design combines the strong air mixing advantage of traditional drum drying with heat pump drying technology, overcoming the problem of high hot air penetration loss in multi-layer mesh belt structures. Simultaneously, by setting a second chain mesh belt conveyor line between the top of the drying chamber and the bag filter, a dust interception and recovery structure is formed. This ensures that the dust lifted by the strong air is blocked and collected by the second chain mesh belt before entering the bag filter, reducing material loss and preventing blockage of the heat pump system and bag filter due to the intake of large amounts of dust, thus improving the reliability of equipment operation and dust removal effect.

[0017] 2. This invention employs a heat pump circulation system to dehumidify, heat, and recycle the gas inside the drying chamber. By integrating the condenser into the air duct of the heating mechanism, heat transfer is completed while the hot air disperses the powder, resulting in high heat utilization efficiency. Simultaneously, the evaporator is located at the exhaust end of the bag filter mechanism, which can cool and dehumidify the humid gas after dust removal. The removed moisture is collected in a condensate collection tray and discharged. The dried low-temperature gas is then compressed and heated by the compressor before entering the condenser for reheating, forming a closed-loop cycle. This avoids the waste of heat energy and environmental pollution caused by the direct discharge of humid waste gas from traditional drying equipment, while also reducing overall energy consumption and meeting the requirements of green and energy-saving production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall assembly of the automatic heat pump drying equipment of the present invention; Figure 2 This is a rear view of the automatic heat pump drying equipment of the present invention; Figure 3 yes Figure 2 A cross-sectional view of the AA side, where the arrows indicate the hot air circulation path; Figure 4 This is a longitudinal sectional view of the automatic heat pump drying equipment of the present invention; Figure 5 This is a cross-sectional view of the automatic heat pump drying equipment of the present invention; Figure 6 This is a schematic diagram of the drying chamber in this invention; Figure 7 This is a schematic diagram of the first chain mesh belt conveyor and heating mechanism in this invention, wherein the solid arrows indicate the material conveying direction and the dashed arrows indicate the hot air flow direction. Figure 8 This is a schematic diagram of the bag filter dust removal mechanism in this invention.

[0019] Explanation of the reference numerals in the figure: 1. Drying chamber; 11. Feeding port; 12. Discharge port; 2. Material conveying mechanism; 21. First chain mesh belt conveyor; 211. First drive motor; 212. First driving sprocket; 213. First driven sprocket; 214. First stainless steel mesh belt; 22. Second chain mesh belt conveyor; 221. Second drive motor; 222. Second driving sprocket; 223. Second driven sprocket; 224. Second stainless steel mesh belt; 3. Heating mechanism; 1. Centrifugal fan; 32. Air distribution plate; 321. Air outlet; 4. Bag filter mechanism; 41. Dust collector housing; 42. Filter bag assembly; 43. Pulse cleaning assembly; 431. Air tank; 432. Pulse valve; 433. Pulse jet pipe; 5. Heat pump circulation system; 51. Compressor; 52. Condenser; 53. Expansion valve; 54. Evaporator; 6. Dust collection chute; 61. Return pipe; 7. Feeding mechanism; 8. Discharge mechanism; 9. Rotary valve. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0022] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0023] The following is in conjunction with the appendix Figure 1-8 The present invention will further describe in detail an embodiment of an automatic heat pump drying device for powdered feed.

[0024] An automatic heat pump drying device for powdered feed, such as Figure 1 , 2 As shown, it includes a drying chamber 1, a material conveying mechanism 2, a heating mechanism 3, a bag filter dust removal mechanism 4, and a heat pump circulation system 5.

[0025] The drying chamber 1 is a sealed chamber that creates a negative pressure environment inside. Its side walls adopt a double-layer insulation structure, with an inner layer of stainless steel plate and an outer layer of galvanized steel plate. The middle layer is filled with polyurethane foam insulation material to reduce heat loss and maintain a stable negative pressure state inside the chamber.

[0026] In this embodiment, as Figure 4 , 6 As shown, the drying chamber 1 has a feeding port 11 and a discharging port 12 on its two sides respectively. The feeding port 11 is located on the side of the drying chamber 1 near the receiving end of the first chain mesh belt conveyor line 21, and the discharging port 12 is located on the side of the drying chamber 1 near the unloading end of the first chain mesh belt conveyor line 21.

[0027] Furthermore, to further monitor the temperature inside the drying chamber 1 in real time, this embodiment also includes an intelligent control system. The intelligent control system includes a temperature sensor, a humidity sensor, a pressure sensor, an online material moisture content detector, and a programmable logic controller (PLC). The temperature sensors are respectively installed at the air inlet and outlet of the drying chamber 1 and above the material conveying mechanism 2 to monitor the temperature distribution of the gas-solid two-phase flow in real time. The humidity sensor is installed at the exhaust end of the bag filter mechanism to provide feedback control of the dehumidification capacity of the heat pump circulation system. The pressure sensor is installed at the top of the drying chamber 1 to monitor and maintain the negative pressure value inside the chamber. The online material moisture content detector is installed at the outlet of the discharge mechanism 8 to detect the moisture content of the dried feed in real time and feed the signal back to the PLC. The PLC automatically adjusts the operating speed of the material conveying mechanism 2, the frequency of the heat pump circulation system 5, and the outlet temperature of the heating mechanism based on the feedback signal.

[0028] In this embodiment, as Figure 2-4 As shown, the material conveying mechanism 2 includes a first chain mesh belt conveyor line 21 and a second chain mesh belt conveyor line 22. The first chain mesh belt conveyor line 21 is located inside the drying chamber 1 near the bottom, with its installation height approximately 300mm to 500mm from the bottom surface of the drying chamber 1, to leave sufficient space for arranging the heating mechanism 3 and the condensate collection tray 10.

[0029] Furthermore, the first chain conveyor belt 21 includes a first drive motor 211, a first driving sprocket 212, a first driven sprocket 213, and a first stainless steel mesh belt 214 surrounding the first driving sprocket 212 and the first driven sprocket 213. The first drive motor 211 is fixedly installed on the outer wall of the drying chamber 1, and its output shaft extends into the drying chamber 1 through a sealed bearing and connects to the first driving sprocket 212. The first driven sprocket 213 is installed at the other end of the drying chamber 1 through a bearing seat. The mesh size of the first stainless steel mesh belt 214 is 1mm, which ensures stable bearing of powdered feed on the mesh belt while allowing airflow to penetrate the mesh belt and contact the material. The conveying speed of the first chain conveyor belt 21 can be adjusted according to the initial moisture content and target moisture content of the feed, and is usually set in the range of 0.1m / s to 0.5m / s.

[0030] The second chain conveyor belt 22 is located near the top inside the drying chamber 1, directly above the first chain conveyor belt 21, forming a dust settling channel between them. The vertical height of the dust settling channel is 1500mm to 2000mm. The second chain conveyor belt 22 includes a second drive motor 221, a second drive sprocket 222, a second driven sprocket 223, and a second stainless steel mesh belt 224 surrounding the second drive sprocket 222 and the second driven sprocket 223. The mesh size of the second stainless steel mesh belt 224 is 0.5mm, smaller than that of the first stainless steel mesh belt 214, to effectively intercept fine dust particles lifted by the airflow.

[0031] In this embodiment, as Figure 4 As shown, the conveying direction of the second chain mesh belt conveyor 22 is opposite to that of the first chain mesh belt conveyor 21. That is, when the first chain mesh belt conveyor 21 conveys the material from the feed port 11 to the discharge port 12, the second chain mesh belt conveyor 22 will convey the intercepted and collected dust from the discharge port 12 to the feed port 11.

[0032] Furthermore, a dust collection chute 6 is provided below the receiving end of the second chain mesh belt conveyor line 22. The dust collection chute 6 has an inverted cone-shaped structure, and its bottom is connected to the receiving end of the first chain mesh belt conveyor line 21 through a return pipe 61, so that the collected powdered feed can be automatically returned to the drying process for reprocessing, avoiding material waste; at the same time, it avoids the tedious operation of manual cleaning and recycling, and improves the continuity of production and the degree of automation.

[0033] Heating mechanisms 3 are disposed on both sides of the first chain mesh belt conveyor line 21 and are arranged at intervals along the conveying direction of the first chain mesh belt conveyor line 21. In this embodiment, for example... Figure 4 , 7As shown, a set of heating mechanisms 3 is arranged on each of the left and right sides of the first chain conveyor belt 21. The air outlet direction of the heating mechanism 3 (as shown by the dashed arrow in the figure) intersects with the conveying direction of the first chain conveyor belt 21 (as shown by the solid arrow in the figure), preferably perpendicular to it. Each set of heating mechanisms 3 includes a centrifugal fan 31 and an air distribution plate 32.

[0034] Furthermore, the centrifugal fan 31 is fixedly connected to the outer bottom of the drying chamber 1, and its air inlet is connected to the air outlet of the condenser 52 through an air duct. The air outlet of the centrifugal fan 31 faces the inside of the drying chamber 1. The air pressure of the centrifugal fan 31 is set to 800Pa to 1500Pa, and the air velocity is controlled at 8m / s to 15m / s to ensure that the powder can be effectively lifted but not directly carried into the bag filter dust removal mechanism 4 at the top by the airflow. The air distribution plate 32 is arranged along the width direction of the first chain mesh belt conveyor line 21 to form a turbulent flow field above the mesh belt to enhance the gas-solid mixing effect. Meanwhile, multiple air outlets 321 are evenly distributed on the air distribution plate 32. The diameter of the air outlets 321 is 5mm to 10mm and the spacing between the outlets is 20mm to 30mm. This ensures that the generated high-speed hot air is blown laterally onto the powdered feed on the mesh belt, scattering and lifting it, so that the powder particles are suspended in the airflow and achieve full and uniform contact with the hot air, thereby achieving rapid drying.

[0035] In this embodiment, as Figure 4 , 8 As shown, the bag filter mechanism 4 is located on the top of the drying chamber 1, and includes a dust collector 41, a filter bag assembly 42, and a pulse cleaning assembly 43. The dust collector 41 is fixedly connected to the top of the drying chamber 1, and its bottom is sealed to the air outlet at the top of the drying chamber 1 via a flange.

[0036] Furthermore, the filter bag assembly 42 is located inside the dust collector housing 41 and consists of 120 to 200 high-temperature resistant needle-punched felt filter bags. The filter bags have a filtration accuracy of 1μm to 5μm and an operating temperature range of 80℃ to 150℃. The filter bags are suspended with the bag opening facing upwards and the bottom sealed. The dust-laden airflow enters from the outside of the filter bag, and the filtered clean gas flows out from the bag opening into the clean air chamber. The pulse cleaning assembly 43 includes an air storage tank 431, a pulse valve 432, and a blowpipe 433. The blowpipe 433 has blowholes facing the bag openings of the filter bags. The blowing cycle is set to 5 to 15 minutes, and the blowing pressure is 0.4 MPa to 0.6 MPa. Compressed air is periodically blown to remove dust adhering to the surface of the filter bags, maintaining stable filtration resistance.

[0037] In this embodiment, as Figure 3 , 5As shown, the heat pump cycle system 5 includes a compressor 51, a condenser 52, an expansion valve 53, and an evaporator 54 connected in sequence via refrigerant piping. The compressor 51, condenser 52, expansion valve 53, and evaporator 54 are arranged in the equipment compartment outside or on the side of the drying chamber 1 to facilitate maintenance and reduce heat source interference inside the chamber.

[0038] Furthermore, compressor 51 is a variable frequency scroll compressor, and the refrigerant is environmentally friendly R134a or R410A. Condenser 52 is a finned tube heat exchanger, and its outlet is connected to the air duct of heating mechanism 3. High-temperature, high-pressure refrigerant gas condenses and releases heat in condenser 52, heating the circulating air to 60°C to 90°C. Expansion valve 53 is an electronic expansion valve that automatically adjusts the refrigerant flow rate according to the system operating status. Evaporator 54 also uses a finned tube heat exchanger and is connected to the exhaust end of bag filter mechanism 4 via a refrigerant pipeline; low-temperature, low-pressure refrigerant liquid evaporates and absorbs heat in evaporator 54, cooling the dust-removed, humid gas to below the dew point temperature, causing the water vapor to condense and precipitate. This condensate is then drawn into compressor 51 for compression and heating, and re-enters condenser 52 for reheating, forming a complete closed-loop heat pump cycle.

[0039] A feeding mechanism 7 is provided on one side of the drying chamber 1, and a discharging mechanism 8 is provided on the other side. In this embodiment, as shown... Figure 1-4 As shown, both the feeding mechanism 7 and the discharging mechanism 8 are screw conveyors, and a rotary valve 9 is provided at the connection between the shell of the screw conveyor and the drying chamber 1.

[0040] Furthermore, the rotary valve 9 adopts a star-shaped unloader structure, with its rotor blades maintaining a tight fit with the housing. This not only enables quantitative conveying of powdered feed but also effectively blocks the exchange of air pressure between the inside and outside of the drying chamber 1, maintaining a negative pressure environment inside the chamber. The discharge end of the feeding mechanism 7 is connected to the feeding port 11 of the drying chamber 1, uniformly conveying the powdered feed to be dried to the receiving end of the first chain mesh belt conveyor line 21. The inlet end of the discharge mechanism 8 is connected to the discharge port 12 of the drying chamber 1, receiving the dried powdered feed and conveying it to the next process. The conveying capacity of the screw conveyor is linked to the conveying speed of the first chain mesh belt conveyor line 21 to ensure the stability of the material layer thickness on the mesh belt, which is typically controlled between 30mm and 80mm.

[0041] The working process of this invention is as follows: After the equipment is started, the heat pump circulation system 5 operates first. The compressor 51 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, which enters the condenser 52 to release heat and heat the circulating air flowing through the air duct of the heating mechanism 3. The centrifugal fan 31 blows the heated air out through the air distribution plate 32 in a horizontal airflow perpendicular to the conveying direction of the first chain mesh belt conveyor line 21, which disperses and lifts the powdery feed on the first stainless steel mesh belt 214, forming a suspended fluidized state. Among the lifted dust, larger particles fall back to the first stainless steel mesh belt 214 under the action of gravity to continue drying, while smaller dust particles rise with the airflow.

[0042] When the airflow reaches the second chain mesh belt conveyor line 22, the second stainless steel mesh belt 224 intercepts the dust. The intercepted dust moves to the receiving end under the conveying action of the second stainless steel mesh belt 224, falls into the dust collection chute 6, and flows back to the receiving end of the first chain mesh belt conveyor line 21 through the return pipe 61 to participate in the drying process again. The dust-laden airflow passing through the second chain mesh belt conveyor line 22 enters the bag filter dust collector 4. After being filtered by the filter bag assembly 42, the clean, hot, humid gas enters the evaporator 54. In the evaporator 54, the hot, humid gas is cooled and dehumidified, and the dried, low-temperature gas returns to the compressor 51, completing the heat pump cycle. The dried powdered feed moves to the unloading end along the first chain mesh belt conveyor line 21 and is conveyed to the subsequent process by the discharge mechanism 8 through the discharge port 12.

[0043] In summary, through the above structural design, powdered feed achieves efficient suspended heat exchange during the drying process, reducing drying time to 60% to 70% of that of traditional multi-layer mesh belt equipment, reducing unit energy consumption by approximately 25% to 35%, and achieving a dust collection efficiency of over 99.5%. The heat pump system and bag filter dust removal mechanism operate stably without clogging, significantly improving the reliability and economy of the equipment.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic heat pump drying device for powdered feed, characterized in that, include: The drying chamber is a sealed chamber that creates a negative pressure environment inside; The material conveying mechanism includes a first chain mesh belt conveyor line located near the bottom of the drying chamber and a second chain mesh belt conveyor line located near the top of the drying chamber. The first chain mesh belt conveyor line is used to carry and convey powdered feed, and the second chain mesh belt conveyor line is used to block and receive dust carried by the airflow. A heating mechanism is installed on both sides of the first chain mesh belt conveyor line to blow away and lift powdered feed; the air outlet direction of the heating mechanism is intersecting or perpendicular to the conveying direction of the first chain mesh belt conveyor line. A bag filter is installed at the top of the drying chamber to collect and filter dust particles that rise with the airflow. The air inlet of the bag filter is connected to the air outlet at the top of the drying chamber. A heat pump circulation system is used to dehumidify, heat, and recycle the gas inside the drying chamber. The heat pump circulation system includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence through refrigerant pipelines. The inlet end of the evaporator is connected to the exhaust end of the bag filter mechanism, and the outlet end is connected to the inlet end of the condenser through the compressor. The outlet end of the condenser is connected to the air duct of the heating mechanism to form a complete closed-loop heat pump cycle.

2. The automatic heat pump drying equipment for powdered feed according to claim 1, characterized in that, The first chain mesh belt conveyor line and the second chain mesh belt conveyor line extend along the length of the drying chamber, and the conveying direction of the first chain mesh belt conveyor line is opposite to that of the second chain mesh belt conveyor line.

3. The automatic heat pump drying equipment for powdered feed according to claim 2, characterized in that, The first chain mesh belt conveyor line includes a first drive motor, a first drive sprocket, a first driven sprocket, and a first stainless steel mesh belt that is arranged around the first drive sprocket and the first driven sprocket; the second chain mesh belt conveyor line includes a second drive motor, a second drive sprocket, a second driven sprocket, and a second stainless steel mesh belt that is arranged around the second drive sprocket and the second driven sprocket.

4. The automatic heat pump drying equipment for powdered feed according to claim 3, characterized in that, The mesh size of the first stainless steel mesh belt is 0.5mm-2mm; the mesh size of the second stainless steel mesh belt is 0.2mm-0.8mm.

5. The automatic heat pump drying equipment for powdered feed according to claim 4, characterized in that, A dust collection chute is provided below the receiving end of the second chain mesh belt conveyor line, and the bottom of the dust collection chute is connected to the first chain mesh belt conveyor line through a return pipe.

6. The automatic heat pump drying equipment for powdered feed according to claim 1, characterized in that, The heating mechanism includes a centrifugal fan and an air distribution plate. The centrifugal fan is fixedly connected to the bottom of the drying chamber, and the air inlet of the centrifugal fan is connected to the air outlet of the condenser. The air distribution plate is arranged along the width direction of the first chain mesh belt conveyor line, and multiple air outlet holes are evenly distributed on the air distribution plate.

7. The automatic heat pump drying equipment for powdered feed according to claim 1, characterized in that, The bag filter dust collection mechanism includes a dust collection box, a filter bag assembly, a pulse cleaning assembly, and an induced draft fan. The dust collection box is fixedly connected to the top of the drying box. The filter bag assembly is located inside the dust collection box and is composed of multiple high-temperature resistant needle-punched felt filter bags. The nozzle of the pulse cleaning assembly is positioned opposite to the bag opening of the filter bag and is used to periodically blow compressed air to remove dust adhering to the surface of the filter bag.

8. The automatic heat pump drying equipment for powdered feed according to claim 7, characterized in that, The pulse cleaning assembly includes an air tank, a pulse valve, and a blowpipe. The air tank is connected to the blowpipe via a high-pressure hose. The pulse valve is located on the pipeline between the air tank and the blowpipe. The blowpipe is arranged horizontally above the filter bag assembly, and a nozzle is provided on the blowpipe corresponding to the opening of each filter bag. The spray angle of the nozzle is set downward.

9. The automatic heat pump drying equipment for powdered feed according to claim 1, characterized in that, A feeding mechanism is provided on one side of the drying chamber, and a discharging mechanism is provided on the other side. The discharging end of the feeding mechanism is connected to the drying chamber and is used to transport the powdered feed to the receiving end of the first chain mesh belt conveyor. The infeed end of the discharging mechanism is connected to the drying chamber and is used to receive and transport the dried powdered feed.

10. The automatic heat pump drying equipment for powdered feed according to claim 9, characterized in that, Both the feeding mechanism and the discharging mechanism adopt screw conveyors. A rotary valve is provided at the connection between the shell of the screw conveyor and the drying chamber to control the quantitative conveying of materials and prevent air pressure exchange.

Images