A heat pump heating device for feed drying

Abstract

The application discloses a kind of heat pump heating device for feed drying, belong to feed drying technical field, including bottom plate, the upper surface of the bottom plate is provided with heat pump mechanism, waste heat recovery mechanism, drying mechanism and crushing dust removal mechanism;In the present application, for feed drying preheating, constant-speed drying, three major differentiating process characteristics of depth deceleration dehumidification, three groups of independent air distribution branch are set, and real-time air pressure sensing and electric pressure regulating air valve linkage structure are matched, the air passage diameter, air volume and air pressure can be dynamically adjusted according to the real-time working condition of each drying area, accurately match the hot air demand of different dehydration stages of feed, effectively avoid the problem of local over-drying and local moisture content exceeding standard in the process of feed drying, realize the partition accurate air supply in drying cavity, gradient dehydration, effectively improve the moisture content consistency of batch feed drying, greatly improve the pass rate of feed product and product quality stability.

Description

Technical Field

[0001] This invention belongs to the field of feed drying technology, and in particular relates to a heat pump heating device for feed drying. Background Technology

[0002] Feed drying is a core and critical process in feed processing and production, directly determining the moisture content, storage period, palatability, and safety of the finished feed. It is widely used in the large-scale processing and production of various types of feed, including pelleted compound feed, fermented lees feed, dried green feed, and livestock and poultry agricultural by-product feed.

[0003] A search revealed Chinese Patent Publication No. CN122107744A, which discloses an automatic heat pump drying device for powdered feed. The device includes a drying chamber with a first chain conveyor belt near the bottom and a second chain conveyor belt near the top. A heating mechanism is located on the side of the first chain conveyor belt, with its air outlet direction intersecting or perpendicular to the conveying direction. A bag filter is located at the top of the drying chamber, with its air inlet connected to the top of the chamber. The outlet is connected to the heating mechanism via a heat pump circulation system, forming a complete closed-loop heat pump cycle. This invention effectively solves the problems of low drying efficiency and poor contact between hot air and powder in existing heat pump drying equipment by using transverse hot air to suspend and heat the powder. Simultaneously, the top mesh belt intercepts dust, reducing material loss and preventing equipment blockage, thus achieving energy saving and environmental protection.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following defects: Existing heat pump drying devices mostly use an integrated fixed-diameter air duct structure, and the air volume and air pressure of the duct cannot be dynamically adjusted according to the drying process. The air supply parameters are uniform throughout the process. In actual production, it is very easy to encounter problems such as insufficient air volume and slow preheating in the early stage of drying, and excessive air pressure in the later stage, causing the surface material to be blown off and dried. This results in some parts of the same batch of feed being too dry and some having excessive moisture content. The moisture content of the finished feed is inconsistent, and the qualified rate of the finished product is low, which cannot meet the standardized production requirements of high-end feed. At the same time, the long-term operation of the fixed air duct is prone to problems such as local air pressure accumulation and heat and moisture accumulation in the dead corners of the air duct, which further aggravates the uneven drying defects.

[0005] Therefore, the present invention provides a heat pump heating device for feed drying to solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a heat pump heating device for feed drying in order to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a heat pump heating device for feed drying, comprising a base plate, wherein a heat pump mechanism, a waste heat recovery mechanism, a drying mechanism and a crushing and dust removal mechanism are provided on the upper surface of the base plate;

[0008] The drying mechanism includes a drying tower, with a mounting frame fixedly installed on the outer surface of the drying tower. The lower surface of the mounting frame is fixedly connected to the upper surface of the base plate. The upper surface of the drying tower is provided with a feed inlet, and the lower surface of the drying tower is provided with a discharge outlet. A control valve is provided on the inner wall of the discharge outlet. The interior of the drying tower is provided with a preheating chamber, a constant speed drying chamber, and a deep dehumidification chamber.

[0009] As a further description of the above technical solution:

[0010] Several heat insulation plates are fixedly installed on the inner wall of the drying tower. The output end of the preheating chamber extends through the heat insulation plates into the constant speed drying chamber and is equipped with a control valve. The output end of the constant speed drying chamber extends through the heat insulation plates into the deep dehumidification chamber and is equipped with a control valve.

[0011] As a further description of the above technical solution:

[0012] The outer surface of the drying tower is provided with several air inlets, which correspond to the preheating chamber, the constant speed drying chamber and the deep dehumidification chamber respectively. Each air inlet is connected to a pressure regulating duct. An electric pressure regulating valve and a real-time air pressure sensor are fixedly installed on the inner wall of the pressure regulating duct. An exhaust gas purification pipe is connected to the outer surface of the drying tower. The exhaust gas purification pipe and the air inlets are symmetrically positioned on the drying tower. A low-temperature plasma deodorization purification module and an activated carbon adsorption filter layer are fixedly installed inside the exhaust gas purification pipe. The exhaust gas purification pipe is connected to the three chambers through pipes.

[0013] As a further description of the above technical solution:

[0014] Several rotating rods are rotatably installed on the inner wall of the drying tower. The rotating rods are located in the preheating chamber, the constant speed drying chamber, and the deep dehumidification chamber, respectively. Several stirring rods are fixedly installed on the outer surface of each rotating rod. One end of each rotating rod extends to the outside of the drying tower. A toothed sprocket is fixedly installed on the outer surface of each rotating rod. The toothed sprockets are located outside the drying tower and are connected to each other by a toothed chain drive. A servo motor is fixedly installed on the outer surface of the drying tower through a connecting seat. The output end of the servo motor is fixedly connected to one end of one of the rotating rods.

[0015] As a further description of the above technical solution:

[0016] The crushing and dust removal mechanism includes a screw conveyor and a screening box. An installation sleeve is fixedly installed on the outer surface of the screw conveyor, and a support column is fixedly installed on the lower surface of the installation sleeve. The lower surface of the support column is fixedly connected to the upper surface of the base plate. A connecting pipe is installed at the output end of the screw conveyor, and the connecting pipe is fixedly connected to the feed port through a flange. A storage hopper is installed at the input end of the screw conveyor.

[0017] As a further description of the above technical solution:

[0018] The screening box is located above the storage hopper, and the discharge end of the screening box corresponds to the storage hopper. An installation column is fixedly installed on the lower surface of the screening box, and the lower surface of the installation column is fixedly connected to the upper surface of the base plate. A feed hopper is installed on the upper surface of the screening box. A slag discharge port is provided on the side wall of the screening box. A dust collection box is detachably installed on the side wall of the screening box, and the dust collection box corresponds to the slag discharge port.

[0019] As a further description of the above technical solution:

[0020] A driving crushing roller and a driven crushing roller are rotatably installed between the inner walls of both sides of the screening box. The driving crushing roller and the driven crushing roller mesh with each other. A stepper motor is fixedly installed on the end face of the screening box through a mounting base. The output end of the stepper motor is fixedly connected to the shaft of the driving crushing roller. A transmission gear plate is fixedly installed on the outer surface of the other shaft of the driving crushing roller and the shaft of the driven crushing roller. The transmission gear plates mesh with each other.

[0021] As a further description of the above technical solution:

[0022] A screening frame is slidably installed between the inner walls of both sides of the screening box. One end of the screening frame extends into the ash collection box through the slag discharge port. A connecting rod is fixedly installed on both sides of the screening frame. One end of the connecting rod extends to the outside of the screening box. A swing rod is rotatably installed on one end of the connecting rod. A rotating disk is rotatably installed on one end of the swing rod through a rotating shaft. The connection between the swing rod and the rotating disk is close to the edge of the rotating disk. The side wall of the rotating disk is fixedly connected to both ends of the shaft of the driven crushing roller.

[0023] As a further description of the above technical solution:

[0024] The heat pump mechanism includes a heat pump compressor and a mounting cover. The lower surfaces of both the heat pump compressor and the mounting cover are fixedly connected to the upper surface of the base plate. A heat pump condenser heat exchanger and a hot air main fan are fixedly installed inside the mounting cover. The heat pump compressor and the heat pump condenser heat exchanger are connected by pipes. The output end of the hot air main fan is connected to a main air duct. The main air duct is connected to the pressure regulating connection duct by a flange. A support frame is fixedly installed on the upper surface of the base plate. A heat pump evaporator heat exchanger is fixedly installed on the upper surface of the support frame. A refrigerant pipe is connected between the heat pump evaporator heat exchanger and the heat pump condenser heat exchanger. A drain pipe is connected to the drain end of the heat pump evaporator heat exchanger.

[0025] As a further description of the above technical solution:

[0026] The waste heat recovery mechanism includes a fan and a water collection tank. The lower surfaces of both the fan and the water collection tank are fixedly connected to the upper surface of the base plate. The water collection tank is located below the support frame and corresponds to the drain pipe. A heat exchange coil is fixedly installed inside the water collection tank. One end of the heat exchange coil is connected to the fan, and the other end of the heat exchange coil extends to the air duct of the heat pump condenser heat exchanger for communication. The bottom of the water collection tank is set to be inclined.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. In this invention, three independent air distribution branches are set up to address the three differentiated process characteristics of feed drying preheating, constant speed drying, and deep deceleration dehumidification. Combined with a linkage structure of real-time air pressure sensing and electric pressure regulating valves, the air duct diameter, air volume, and air pressure can be dynamically adjusted according to the real-time operating conditions of each drying area. This accurately matches the hot air requirements of different dehydration stages of the feed, effectively avoiding the problems of local over-drying and local excessive moisture content during the feed drying process. It achieves precise air delivery and gradient dehydration in the drying chamber, effectively improving the consistency of moisture content in batch feed drying, and significantly improving the qualified rate and product quality stability of finished feed.

[0029] 2. In this invention, the drying tower is divided into three independent drying zones, which enable independent and precise temperature, humidity and air control in each zone. This precisely adapts to the gradient drying process of feed, from the evaporation of surface free water to the migration of deep internal moisture. It effectively avoids the problem of temperature fluctuation in the cavity caused by ambient temperature fluctuations, eliminates the defect of temperature control lag, improves the precision of the drying process, and can meet the drying production standards of high-end fine feed.

[0030] 3. In this invention, by setting up a waste heat recovery mechanism, the waste heat of the originally directly discarded condensate is fully recovered, and the ambient temperature fresh air entering the equipment is preheated in a gradient manner, which effectively reduces the heating load of the heat pump host and solves the problems of insufficient fresh air preheating, lagging temperature control, and serious waste heat in traditional equipment. The overall thermal energy utilization rate of the equipment is improved, and the power consumption and production and operation costs of feed drying and processing are greatly reduced, making it suitable for large-scale and continuous feed drying production scenarios.

[0031] 4. In this invention, a composite purification structure of low-temperature plasma degradation and activated carbon secondary adsorption is adopted. The low-temperature plasma technology efficiently degrades odor molecules and harmful impurities in the exhaust gas under conditions of no high-temperature energy consumption and no secondary pollution. Then, the exhaust gas is deeply purified by activated carbon adsorption, and finally the exhaust gas is harmlessly discharged in compliance with standards. This solves the air pollution problem in the factory area caused by direct exhaust of traditional equipment, meets the environmental protection production standards of modern feed factories, and the equipment is more adaptable to a wider range of scenarios and has a significantly improved environmental performance.

[0032] 5. In this invention, a crushing roller and a screening frame are used to crush impurities and feed. This not only breaks up agglomerated feed clumps but also intercepts large particles of debris generated during the feed drying process. This prevents agglomerated feed clumps from affecting the drying efficiency and effect of the feed in subsequent drying processes. At the same time, it prevents debris from entering the heat exchange duct and adhering to the surface of the condenser and evaporator, thus preventing equipment failures such as heat exchanger efficiency decay and duct blockage from the root. Furthermore, it is equipped with a detachable dust collection box, which can realize centralized dust collection, significantly reducing equipment operation and maintenance costs and downtime probability. It solves the problems of dust accumulation, mold growth, and contamination of clean feed in traditional equipment, ensuring the cleanliness and food safety of dried feed, and meeting the production requirements of food-grade, high-quality feed. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of a heat pump heating device for feed drying.

[0034] Figure 2 This is a three-dimensional structural diagram of a heat pump heating device for feed drying from another angle.

[0035] Figure 3 This is a three-dimensional structural diagram of a drying tower in a heat pump heating device for feed drying.

[0036] Figure 4 In a heat pump heating device for feed drying Figure 3 A magnified structural diagram of point A in the middle.

[0037] Figure 5 This is a schematic cross-sectional view of the drying tower in a heat pump heating device for feed drying.

[0038] Figure 6 This is a cross-sectional schematic diagram of the waste heat recovery mechanism in a heat pump heating device for feed drying.

[0039] Figure 7 This is an exploded view of the crushing and dust removal mechanism in a heat pump heating device for feed drying.

[0040] Figure 8 This is a partial cross-sectional schematic diagram of the crushing and dust removal mechanism in a heat pump heating device for feed drying.

[0041] Figure 9 This is a three-dimensional structural diagram of a screening box in a heat pump heating device for feed drying.

[0042] Legend:

[0043] 1. Base plate; 2. Heat pump mechanism; 201. Heat pump compressor; 202. Mounting cover; 203. Refrigerant pipe; 204. Support frame; 205. Heat pump evaporator heat exchanger; 3. Waste heat recovery mechanism; 301. Fan; 302. Water collection tank; 303. Heat exchange coil; 4. Drying mechanism; 401. Drying tower; 402. Feed inlet; 403. Discharge outlet; 404. Mounting frame; 405. Air inlet; 406. Servo motor; 407. Rotating rod; 408. Toothed sprocket; 409. Stirring rod; 4010. Preheating chamber; 4011. Constant speed drying chamber; 4012. 4013. Deep dehumidification chamber; 4014. Insulation board; 4015. Exhaust gas purification pipe; 5. Pressure regulating connecting air duct; 6. Crushing and dust removal mechanism; 601. Screw elevator; 602. Mounting sleeve; 603. Support column; 604. Connecting pipe; 605. Storage hopper; 606. Screening box; 607. Mounting column; 608. Feed hopper; 609. Stepper motor; 6010. Drive crushing roller; 6011. Driven crushing roller; 6012. Screening frame; 6013. Ash collection box; 6014. Transmission gear plate; 6015. Rotating plate; 6016. Swing rod; 6017. Connecting rod. Detailed Implementation

[0044] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In specific implementation, such as Figures 1-9As shown, the present invention provides a technical solution: a heat pump heating device for feed drying, including a base plate 1, a heat pump mechanism 2, a waste heat recovery mechanism 3, a drying mechanism 4, and a crushing and dust removal mechanism 6 arranged on the upper surface of the base plate 1; wherein, the drying mechanism 4 includes a drying tower 401, an installation frame 404 is fixedly installed on the outer surface of the drying tower 401, the lower surface of the installation frame 404 is fixedly connected to the upper surface of the base plate 1, an inlet 402 is provided on the upper surface of the drying tower 401, an outlet 403 is provided on the lower surface of the drying tower 401, a control valve is provided on the inner wall of the outlet 403, and a preheating chamber 4010, a constant speed drying chamber 4011, and a deep dehumidification chamber 4012 are arranged inside the drying tower 401.

[0046] Several heat insulation plates 4013 are fixedly installed on the inner wall of the drying tower 401. The output end of the preheating chamber 4010 extends through the heat insulation plate 4013 into the constant speed drying chamber 4011 and is equipped with a control valve. The output end of the constant speed drying chamber 4011 extends through the heat insulation plate 4013 into the deep dehumidification chamber 4012 and is equipped with a control valve.

[0047] The outer surface of the drying tower 401 is provided with several air inlets 405, which correspond to the preheating chamber 4010, the constant speed drying chamber 4011 and the deep dehumidification chamber 4012 respectively. Each air inlet 405 is connected to a pressure regulating connecting air duct 5. An electric pressure regulating air valve and a real-time air pressure sensor are fixedly installed on the inner wall of the pressure regulating connecting air duct 5. An exhaust gas purification pipe 4014 is connected to the outer surface of the drying tower 401. The exhaust gas purification pipe 4014 and the air inlets 405 are symmetrically positioned on the drying tower 401. A low-temperature plasma deodorization purification module and an activated carbon adsorption filter layer are fixedly installed inside the exhaust gas purification pipe 4014. The exhaust gas purification pipe 4014 is connected to the three chambers through pipes.

[0048] Several rotating rods 407 are rotatably installed on the inner wall of the drying tower 401. The rotating rods 407 are located in the preheating chamber 4010, the constant speed drying chamber 4011, and the deep dehumidification chamber 4012, respectively. Several stirring rods 409 are fixedly installed on the outer surface of each rotating rod 407. One end of the rotating rod 407 extends to the outside of the drying tower 401. A toothed sprocket 408 is fixedly installed on the outer surface of the rotating rod 407. The toothed sprockets 408 are located outside the drying tower 401 and are connected to each other by a toothed chain drive. A servo motor 406 is fixedly installed on the outer surface of the drying tower 401 through a connecting seat. The output end of the servo motor 406 is fixedly connected to one end of one of the rotating rods 407.

[0049] Specifically, by setting up the drying mechanism 4, the hot air from the main air duct enters the drying tower 401 through the air inlet 405 after passing through the pressure regulating connecting air pipe 5. Under the action of the electric pressure regulating air valve and the real-time air pressure sensor, the air pressure and air volume of different air inlets 405 are controlled. The preheating chamber 4010 is matched with high flow rate, low air pressure and medium and low temperature hot air to preheat and dehumidify the feed and evaporate the free moisture on the surface of the feed. The constant speed drying chamber 4011 is matched with medium temperature and constant pressure hot air to ensure that the internal moisture of the feed migrates outward at a uniform speed and achieve stable dehydration. The deep dehumidification chamber 4012 is matched with high temperature, low flow rate and high air pressure hot air. The airflow deeply dehumidifies and shapes the feed. The feed first falls into the preheating chamber 4010 through the feed inlet 402, and after preheating, it falls into the constant speed drying chamber 4011. Finally, it passes through the deep dehumidification chamber 4012 and is discharged through the discharge port 403. During the feed drying process, the servo motor 406 drives one of the rotating rods 407 to rotate. Under the transmission of the toothed sprocket 408 and the toothed chain, it drives the other rotating rod 407 to rotate. As the rotating rod 407 rotates, it drives the stirring rod 409 to rotate in different chambers, thereby turning the feed in different stages of drying.

[0050] The hot and humid exhaust gas generated during the drying chamber operation is collected through the air duct and enters the exhaust gas purification pipe 4014. The exhaust gas first enters the low-temperature plasma deodorization and purification module, where feed odor molecules and trace amounts of harmful gases contained in the exhaust gas are degraded in a low-temperature environment without the need for high-temperature heating and secondary pollution. After plasma degradation, the exhaust gas then passes through the activated carbon adsorption filter layer, where residual trace impurities and odors are adsorbed a second time, and finally discharged after meeting the standards.

[0051] The crushing and dust removal mechanism 6 includes a screw conveyor 601 and a screening box 606. An installation sleeve 602 is fixedly installed on the outer surface of the screw conveyor 601. A support column 603 is fixedly installed on the lower surface of the installation sleeve 602. The lower surface of the support column 603 is fixedly connected to the upper surface of the base plate 1. A connecting pipe 604 is installed at the output end of the screw conveyor 601. The connecting pipe 604 is fixedly connected to the feed port 402 through a flange. A storage hopper 605 is installed at the input end of the screw conveyor 601.

[0052] The screening box 606 is located above the storage hopper 605 and the discharge end of the screening box 606 corresponds to the storage hopper 605. The lower surface of the screening box 606 is fixedly installed with a mounting column 607, and the lower surface of the mounting column 607 is fixedly connected to the upper surface of the base plate 1. The upper surface of the screening box 606 is connected to the feed hopper 608. The side wall of the screening box 606 is provided with a slag discharge port. The side wall of the screening box 606 is detachably installed with an ash collection box 6013, and the ash collection box 6013 corresponds to the slag discharge port.

[0053] A drive crushing roller 6010 and a driven crushing roller 6011 are rotatably mounted between the inner walls of both sides of the screening box 606. The drive crushing roller 6010 and the driven crushing roller 6011 mesh with each other. A stepper motor 609 is fixedly mounted on the end face of the screening box 606 through a mounting base. The output end of the stepper motor 609 is fixedly connected to the shaft of the drive crushing roller 6010. A transmission gear plate 6014 is fixedly mounted on the outer surface of the other shaft of the drive crushing roller 6010 and the shaft of the driven crushing roller 6011. The transmission gear plates 6014 mesh with each other.

[0054] A screening frame 6012 is slidably installed between the inner walls of both sides of the screening box 606. One end of the screening frame 6012 extends into the ash collection box 6013 through the slag discharge port. A connecting rod 6017 is fixedly installed on both sides of the screening frame 6012. One end of the connecting rod 6017 extends to the outside of the screening box 606. A swing rod 6016 is rotatably installed on one end of the connecting rod 6017. A rotating disk 6015 is rotatably installed on one end of the swing rod 6016 through a rotating shaft. The connection between the swing rod 6016 and the rotating disk 6015 is close to the edge of the rotating disk 6015. The side wall of the rotating disk 6015 is fixedly connected to both ends of the shaft of the driven crushing roller 6011.

[0055] Specifically, by setting up a crushing and dust removal mechanism 6, a stepper motor 609 drives the drive crushing roller 6010 to rotate. Under the action of the transmission gear plate 6014, the driven crushing roller 6011 and the drive crushing roller 6010 rotate relative to each other in the screening box 606. As the driven crushing roller 6011 rotates, it drives the rotating disk 6015 to rotate synchronously through the shaft. At this time, under the action of the swing rod 6016, the connecting rod 6017 drives the screening frame 6012 to shake up and down in the screening box 606. The feed is fed through the screen. Before the feed enters the screening box 606, the driving crushing roller 6010 and the driven crushing roller 6011 crush the feed, breaking up the lumpy feed and dropping it into the screening frame 6012. Under the shaking of the screening frame 6012, the impurities in the feed are screened out. The impurities fall into the ash collection box 6013 through the slag discharge port under the shaking of the screening frame 6012. The screened feed falls into the storage hopper 605. Under the action of the screw conveyor 601, the feed is transported to the drying tower 401 through the connecting pipe 604.

[0056] The heat pump mechanism 2 includes a heat pump compressor 201 and a mounting cover 202. The lower surfaces of both the heat pump compressor 201 and the mounting cover 202 are fixedly connected to the upper surface of the base plate 1. The heat pump condenser heat exchanger and the hot air main fan 301 are fixedly installed inside the mounting cover 202. The heat pump compressor 201 and the heat pump condenser heat exchanger are connected by pipes. The output end of the hot air main fan 301 is connected to a main air duct. The main air duct is connected to the pressure regulating connection air duct 5 by a flange. A support frame 204 is fixedly installed on the upper surface of the base plate 1. A heat pump evaporator heat exchanger 205 is fixedly installed on the upper surface of the support frame 204. A refrigerant pipe 203 is connected between the heat pump evaporator heat exchanger 205 and the heat pump condenser heat exchanger. A drain pipe is connected to the drain end of the heat pump evaporator heat exchanger 205.

[0057] Specifically, by setting up heat pump mechanism 2, after the equipment is started, heat pump compressor 201 works to compress low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant flows into the heat pump condenser heat exchanger and completes heat exchange in the main air duct, heating the air flowing in the air duct to form the high-temperature hot air required for feed drying. The high-pressure liquid refrigerant after releasing heat flows into heat pump evaporator heat exchanger 205 through refrigerant pipe 203. Heat pump evaporator heat exchanger 205 absorbs heat from the outside air to complete the refrigerant vaporization. The generated low-temperature, low-pressure gaseous refrigerant flows back to air source heat pump compressor 201, completing a complete heat pump heating cycle and continuously providing a stable heat source for the drying system. At the same time, heat pump evaporator heat exchanger 205 continuously generates high-temperature condensate during the heat exchange process, and the high-temperature condensate is discharged through drain pipe.

[0058] The waste heat recovery mechanism 3 includes a fan 301 and a water collection tank 302. The lower surfaces of the fan 301 and the water collection tank 302 are fixedly connected to the upper surface of the base plate 1. The water collection tank 302 is located below the support frame 204. The water collection tank 302 corresponds to the drain pipe. A heat exchange coil 303 is fixedly installed inside the water collection tank 302. One end of the heat exchange coil 303 is connected to the fan 301, and the other end of the heat exchange coil 303 extends to the air duct of the heat exchanger of the heat pump condenser for communication. The bottom of the water collection tank 302 is set to be inclined.

[0059] Specifically, by setting up a waste heat recovery mechanism 3, all the discharged high-temperature condensate flows into the inclined condensate collection tank 302. The heat exchange coils 303 arranged in the tank fully absorb the waste heat of the condensate. After the ambient temperature fresh air enters the equipment under the action of the fan 301, it is preheated at low temperature by the heat exchange coils 303 to increase the basic temperature of the fresh air.

[0060] Working principle: After the equipment is started, the heat pump compressor 201 operates, compressing the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant flows into the heat pump condenser heat exchanger, where heat exchange is completed in the main air duct, heating the air flowing in the duct to form the high-temperature hot air required for feed drying. The high-pressure liquid refrigerant, after releasing heat, flows into the heat pump evaporator heat exchanger 205 through the refrigerant pipe 203. The heat pump evaporator heat exchanger 205 absorbs heat from the outside air to complete the refrigerant vaporization. The generated low-temperature, low-pressure gaseous refrigerant flows back to the air source heat pump compressor 201, completing the complete heat pump heating cycle and continuously providing a stable heat source for the drying system. At the same time, the heat pump evaporator heat exchanger 205 continuously generates high-temperature condensate during the heat exchange process, which is discharged through the drain pipe.

[0061] All the discharged high-temperature condensate flows into the inclined condensate collection tank 302. The heat exchange coils 303 arranged in the tank fully absorb the waste heat of the condensate. After the ambient temperature fresh air enters the equipment under the action of the fan 301, it is preheated at low temperature by the heat exchange coils 303 to increase the basic temperature of the fresh air.

[0062] Stepper motor 609 drives drive crushing roller 6010 to rotate. Under the action of transmission gear plate 6014, driven crushing roller 6011 and drive crushing roller 6010 rotate relative to each other in screening box 606. As driven crushing roller 6011 rotates, it drives rotating disk 6015 to rotate synchronously through shaft. At this time, under the action of swing rod 6016, connecting rod 6017 drives screening frame 6012 to shake up and down in screening box 606. Feed enters the screening box through feed hopper 608. Before the box 606, the driving crushing roller 6010 and the driven crushing roller 6011 will first crush the feed, breaking up the lumpy feed and dropping it into the screening frame 6012. Under the shaking of the screening frame 6012, the impurities in the feed are screened out. The impurities fall into the ash collection box 6013 through the slag discharge port under the shaking of the screening frame 6012. The screened feed falls into the storage hopper 605. Under the action of the screw conveyor 601, the feed is transported to the drying tower 401 through the connecting pipe 604.

[0063] Hot air from the main air duct enters the drying tower 401 through inlet 405 after passing through pressure regulating connecting duct 5. Under the action of the electric pressure regulating valve and real-time air pressure sensor, the air pressure and airflow at different inlets 405 are controlled. The preheating chamber 4010 is equipped with high-flow, low-pressure, and medium-low temperature hot air to preheat and dehumidify the feed, evaporating free moisture from the surface. The constant-speed drying chamber 4011 is equipped with medium-temperature and constant-pressure hot air to ensure that internal moisture migrates outward at a uniform speed, achieving stable dehydration. The deep dehumidification chamber 4012 is equipped with high-temperature, low-flow, and high-pressure hot air to further dehumidify the feed. For deep dehumidification and shaping, the feed first falls into the preheating chamber 4010 through the feed inlet 402, and after preheating, it falls into the constant speed drying chamber 4011. Finally, it passes through the deep dehumidification chamber 4012 and is discharged through the discharge port 403. During the feed drying process, the servo motor 406 drives one of the rotating rods 407 to rotate. Under the transmission of the toothed sprocket 408 and the toothed chain, it drives the other rotating rod 407 to rotate. As the rotating rod 407 rotates, it drives the stirring rod 409 to rotate in different chambers, thereby turning the feed in different stages of drying.

[0064] The hot and humid exhaust gas generated during the drying chamber operation is collected through the air duct and enters the exhaust gas purification pipe 4014. At this time, the exhaust gas first enters the low-temperature plasma deodorization and purification module, which degrades the feed odor molecules and trace harmful gases contained in the exhaust gas in a low-temperature environment without high-temperature heating and secondary pollution. After plasma degradation, the exhaust gas passes through the activated carbon adsorption filter layer for secondary adsorption of residual trace impurities and odors, and is finally discharged after meeting the standards.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat pump heating device for feed drying, characterized in that: include: The base plate (1) is provided with a heat pump mechanism (2), a waste heat recovery mechanism (3), a drying mechanism (4) and a crushing and dust removal mechanism (6) on its upper surface. The drying mechanism (4) includes a drying tower (401), and a mounting frame (404) is fixedly installed on the outer surface of the drying tower (401). The lower surface of the mounting frame (404) is fixedly connected to the upper surface of the base plate (1). The upper surface of the drying tower (401) is provided with a feed inlet (402), and the lower surface of the drying tower (401) is provided with a discharge outlet (403). A control valve is provided on the inner wall of the discharge outlet (403). The interior of the drying tower (401) is provided with a preheating chamber (4010), a constant speed drying chamber (4011), and a deep dehumidification chamber (4012).

2. The heat pump heating device for feed drying according to claim 1, characterized in that, Several heat insulation plates (4013) are fixedly installed on the inner wall of the drying tower (401). The output end of the preheating chamber (4010) extends through the heat insulation plate (4013) into the constant speed drying chamber (4011) and is equipped with a control valve. The output end of the constant speed drying chamber (4011) extends through the heat insulation plate (4013) into the deep dehumidification chamber (4012) and is equipped with a control valve.

3. A heat pump heating device for feed drying according to claim 1, characterized in that, The outer surface of the drying tower (401) is provided with several air inlets (405), which correspond to the preheating chamber (4010), the constant speed drying chamber (4011), and the deep dehumidification chamber (4012), respectively. Each air inlet (405) is connected to a pressure regulating connecting air duct (5). An electric pressure regulating air valve and a real-time air pressure sensor are fixedly installed on the inner wall of the pressure regulating connecting air duct (5). The outer surface of the drying tower (401) is connected to a waste gas purification pipe (4014). The waste gas purification pipe (4014) and the air inlets (405) are symmetrically positioned on the drying tower (401). The interior of the waste gas purification pipe (4014) is fixedly equipped with a low-temperature plasma deodorization purification module and an activated carbon adsorption filter layer. The waste gas purification pipe (4014) is connected to the three chambers through a pipe.

4. A heat pump heating device for feed drying according to claim 1, characterized in that, Several rotating rods (407) are rotatably installed on the inner wall of the drying tower (401). The rotating rods (407) are located in the preheating chamber (4010), the constant speed drying chamber (4011), and the deep dehumidification chamber (4012), respectively. Several stirring rods (409) are fixedly installed on the outer surface of each rotating rod (407). One end of each rotating rod (407) extends to the outside of the drying tower (401). A toothed sprocket (408) is fixedly installed on the outer surface of the rotating rod (407). The toothed sprocket (408) is located outside the drying tower (401) and the toothed sprockets (408) are connected to each other by a toothed chain drive. A servo motor (406) is fixedly installed on the outer surface of the drying tower (401) through a connecting seat. The output end of the servo motor (406) is fixedly connected to one end of one of the rotating rods (407).

5. A heat pump heating device for feed drying according to claim 1, characterized in that, The crushing and dust removal mechanism (6) includes a screw conveyor (601) and a screening box (606). An installation sleeve (602) is fixedly installed on the outer surface of the screw conveyor (601). A support column (603) is fixedly installed on the lower surface of the installation sleeve (602). The lower surface of the support column (603) is fixedly connected to the upper surface of the base plate (1). A connecting pipe (604) is connected to the output end of the screw conveyor (601). The connecting pipe (604) is fixedly connected to the feed port (402) through a flange. A storage hopper (605) is connected to the input end of the screw conveyor (601).

6. A heat pump heating device for feed drying according to claim 5, characterized in that, The screening box (606) is located above the storage hopper (605) and the discharge end of the screening box (606) corresponds to the storage hopper (605). An installation column (607) is fixedly installed on the lower surface of the screening box (606). The lower surface of the installation column (607) is fixedly connected to the upper surface of the base plate (1). A feed hopper (608) is connected to the upper surface of the screening box (606). A slag discharge port is provided on the side wall of the screening box (606). A dust collection box (6013) is detachably installed on the side wall of the screening box (606). The dust collection box (6013) corresponds to the slag discharge port.

7. A heat pump heating device for feed drying according to claim 5, characterized in that, A drive crushing roller (6010) and a driven crushing roller (6011) are rotatably mounted between the inner walls of both sides of the screening box (606). The drive crushing roller (6010) and the driven crushing roller (6011) mesh with each other. A stepper motor (609) is fixedly mounted on the end face of the screening box (606) through a mounting base. The output end of the stepper motor (609) is fixedly connected to the shaft of the drive crushing roller (6010). A transmission gear plate (6014) is fixedly mounted on the outer surface of the other shaft of the drive crushing roller (6010) and the shaft of the driven crushing roller (6011). The transmission gear plates (6014) mesh with each other.

8. A heat pump heating device for feed drying according to claim 5, characterized in that, A screening frame (6012) is slidably installed between the inner walls of the two sides of the screening box (606). One end of the screening frame (6012) extends into the ash collection box (6013) through the slag discharge port. A connecting rod (6017) is fixedly installed on both sides of the screening frame (6012). One end of the connecting rod (6017) extends to the outside of the screening box (606). A swing rod (6016) is rotatably installed on one end of the connecting rod (6017). A rotating disk (6015) is rotatably installed on one end of the swing rod (6016) through a rotating shaft. The connection between the swing rod (6016) and the rotating disk (6015) is close to the edge of the rotating disk (6015). The side wall of the rotating disk (6015) is fixedly connected to both ends of the shaft of the driven crushing roller (6011).

9. A heat pump heating device for feed drying according to claim 1, characterized in that, The heat pump mechanism (2) includes a heat pump compressor (201) and a mounting cover (202). The lower surfaces of the heat pump compressor (201) and the mounting cover (202) are fixedly connected to the upper surface of the base plate (1). The heat pump condenser heat exchanger and the hot air main fan (301) are fixedly installed inside the mounting cover (202). The heat pump compressor (201) and the heat pump condenser heat exchanger are connected by a pipe. The output end of the hot air main fan (301) is connected to the main air duct. The main air duct is connected to the pressure regulating connecting air pipe (5) by a flange. The upper surface of the base plate (1) is fixedly installed with a support frame (204). The upper surface of the support frame (204) is fixedly installed with a heat pump evaporator heat exchanger (205). The heat pump evaporator heat exchanger (205) and the heat pump condenser heat exchanger are connected by a refrigerant pipe (203). The drain end of the heat pump evaporator heat exchanger (205) is connected to a drain pipe.

10. A heat pump heating device for feed drying according to claim 1, characterized in that, The waste heat recovery mechanism (3) includes a fan (301) and a water collection tank (302). The lower surfaces of the fan (301) and the water collection tank (302) are fixedly connected to the upper surface of the base plate (1). The water collection tank (302) is located below the support frame (204). The water collection tank (302) corresponds to the drain pipe. A heat exchange coil (303) is fixedly installed inside the water collection tank (302). One end of the heat exchange coil (303) is connected to the fan (301). The other end of the heat exchange coil (303) extends to the air duct of the heat pump condenser heat exchanger for communication. The bottom of the water collection tank (302) is set to be inclined.

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