Graded continuous grain drying and dewatering apparatus

Abstract

The application discloses a kind of hierarchical continuous grain drying and dewatering equipment, for the drying of grain, including drying box, the low-temperature electric auxiliary preheating chamber is sequentially provided in the drying box from top to bottom, hot air dehumidification drying chamber, high-temperature electric auxiliary drying chamber, hot air low-temperature drying chamber and cooling storage room;Multiple drying chambers are separated in the application, grain moves down step by step from top to bottom, drying, when switching between drying chamber, it can be turned over to grain, ensure the uniformity of grain drying, while the upper layer and lower layer grain are separated without mixing, the humidity of grain in the lowermost layer is basically the same, at this time, the humidity of grain discharged from discharge port is the same, which can accurately represent the drying degree of the last discharged grain, beneficial to operator naked eye observation.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a graded continuous grain drying and dehydration equipment. Background Technology

[0002] All harvested grains in agriculture require dehumidification and drying. The purpose of this process is to reduce the moisture content of the grains. Lowering the moisture content reduces energy consumption through respiration and prevents germination and mold growth. Traditional grain dehumidification and drying typically involves natural sun-drying. However, natural sun-drying is highly susceptible to weather conditions and has relatively low efficiency. Furthermore, it requires manual turning at regular intervals to ensure even drying, increasing the workload for workers. Existing technologies include vertical or tower dryers suitable for large grain depots, but these have large capacities and are not suitable for individual farmers or small grain silos.

[0003] With the continuous development of modern agricultural technology, small grain dryers have emerged. Currently, the most commonly used small dryers include rotary drum dryers and hot air dryers. Rotary drum dryers use a motor to drive the drum to rotate. The grain inside the drum rotates with the drum, and the grain comes into contact with the hot air and heating elements inside the drum to achieve tumbling and drying. Since the grain generally occupies at least 1 / 3 of the drum cavity, the grain is mostly piled up, resulting in poor moisture removal during drying. In order to avoid the grain from bursting due to excessive drying speed, the heating temperature of this drying equipment cannot be too high. Each drying time can reach 3-4 hours, and the motor needs to run continuously without interruption. The operating cost of this type of rotary drum dryer is relatively high. Hot air dryers use hot air to dry grains. As the grains fall, hot air blows directly onto them to heat and dry them. However, because the grains fall quickly and are heated for a short time, they are only briefly heated before falling into the recovery bin and no longer heated. This results in low drying efficiency per cycle. Therefore, an lifting auger is needed to transport the material that has fallen to the bottom to the top, and then use hot air to dry it when it falls again. During the upward lifting process, no hot air drying is carried out. This process is an empty stroke, which not only consumes energy but also takes up the overall drying time. In addition, both of the above methods share a common drawback: during the process of grain entering and exiting, it generally flows out from only one outlet. The grain either flows directly out after falling from the top to the bottom, or the outlet is closed, causing the grain to accumulate for a period of time before flowing out from one outlet. At this time, the grain near the outlet will flow out first, and it flows out in a mixed manner with the grain from the upper and lower layers. Therefore, the upper and lower layers of grain stay in the dryer for different periods of time, resulting in different drying effects. Operators often need to visually observe the degree of drying of the material at the outlet, but the large difference in the mixing of grains discharged from the outlet at this time makes it difficult for operators to observe accurately. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a graded continuous grain drying and dehydration device.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a graded continuous grain drying and dehydration equipment for drying grains, including a drying box, wherein the drying box is provided with a low-temperature electric auxiliary preheating chamber, a hot air dehumidification drying chamber, a high-temperature electric auxiliary drying chamber, a hot air low-temperature drying chamber, and a cooling storage chamber in sequence from top to bottom;

[0006] A drying oven, wherein the top of the drying oven is provided with a feed inlet and the bottom of the drying oven is provided with a discharge outlet;

[0007] Two low-temperature electric auxiliary heating plates are provided and arranged side by side. When the two low-temperature electric auxiliary heating plates are horizontally connected, the two low-temperature electric auxiliary heating plates cooperate to isolate the low-temperature electric auxiliary preheating chamber from the hot air dehumidification drying chamber. The upper surface of the two low-temperature electric auxiliary heating plates is used to receive and cover the grains for low-temperature preheating and drying. When the two low-temperature electric auxiliary heating plates are in a figure-eight shape, the grains dried on the upper surface of the two low-temperature electric auxiliary heating plates slide down from the left and right sides and flow into the hot air dehumidification drying chamber. A low-temperature plate turning mechanism is provided between the drying box and the two low-temperature electric auxiliary heating plates to switch the two horizontally connected low-temperature electric auxiliary heating plates to a figure-eight shape.

[0008] A dehumidifying drying chamber guide plate is provided on each of the left and right sides of the drying box. The two dehumidifying drying chamber guide plates are arranged in a V-shape to isolate the hot air dehumidifying drying chamber from the high-temperature electric auxiliary drying chamber. A dehumidifying drying chamber discharge port is provided between the bottom ends of the two dehumidifying drying chamber guide plates. A dehumidifying circulating lifting device is provided at the dehumidifying drying chamber discharge port. A dehumidifying hot air system is provided on the drying box corresponding to the hot air dehumidifying drying chamber.

[0009] Two high-temperature electric auxiliary heating plates are provided and arranged side by side. When the two high-temperature electric auxiliary heating plates are horizontally connected, the two high-temperature electric auxiliary heating plates cooperate to isolate the high-temperature electric auxiliary drying chamber from the hot air low-temperature drying chamber. The upper surface of the two high-temperature electric auxiliary heating plates is used to receive and dry the grains at high temperature. When the two high-temperature electric auxiliary heating plates are in a figure-eight shape, the grains dried on the upper surface of the two high-temperature electric auxiliary heating plates slide down from the left and right sides and flow into the hot air low-temperature drying chamber. A high-temperature plate turning mechanism is provided between the drying box and the high-temperature electric auxiliary heating plates to switch the two horizontally connected high-temperature electric auxiliary heating plates to a figure-eight shape.

[0010] A low-temperature drying chamber guide plate is provided on each of the left and right sides of the drying box. The two low-temperature drying chamber guide plates are arranged in a V-shape to isolate the hot air low-temperature drying chamber from the cooling storage chamber. A low-temperature drying chamber discharge port is provided between the bottom ends of the two low-temperature drying chamber guide plates. A low-temperature circulating lifting device is provided at the low-temperature drying chamber discharge port. A low-temperature hot air system is provided on the drying box corresponding to the hot air low-temperature drying chamber.

[0011] The cooling storage chamber is a V-shaped discharge hopper, and the discharge port is located at the bottom of the V-shaped discharge hopper. The drying box is equipped with a low-temperature cooling system corresponding to the cooling storage chamber.

[0012] As a preferred technical solution, the low-temperature electric auxiliary heating material plate includes a material plate mounting base. A plurality of material plate electric heating tubes are mounted on the upper surface of the material plate mounting base. A receiving heat-conducting material plate is correspondingly mounted above the material plate electric heating tubes. The receiving heat-conducting material plate and the material plate mounting base are fixedly connected by a Z-shaped support. An anti-scorching isolation cavity is formed between the receiving heat-conducting material plate and the material plate mounting base. Material plate baffle plates are fixed at both the front and rear ends of the receiving heat-conducting material plate. Material plate guide plates are fixedly mounted on the left and right inner walls of the drying chamber. The bottom end of the material plate guide plate extends downwards at an angle, blocking the gap between the end of the corresponding receiving heat-conducting material plate and the inner wall of the drying chamber. A low-temperature rubber skirt is fixedly mounted at the bottom end of the material plate guide plate, and the bottom end of the low-temperature rubber skirt abuts against the upper surface of the receiving heat-conducting material plate.

[0013] As a preferred technical solution, the low-temperature material plate turning mechanism includes a material plate turning base plate. Two base plate limiting uprights are correspondingly provided on the front and rear inner walls of the drying oven. A vertical base plate limiting guide groove is formed between the two base plate limiting uprights. Base plate limiting guide blocks that slide up and down along the base plate limiting guide groove are provided at both ends of the material plate turning base plate. A base plate lower limiting plate is also correspondingly provided below the base plate limiting guide blocks. A material plate hinge seat is installed on the left end of the top surface of the material plate turning base plate. A material plate rotating shaft is provided at the bottom end of the material plate mounting base plate. The material plate rotating shaft is rotatably mounted on the material plate hinge seat. A material plate support block is fixed to the right end of the top surface of the material plate turning base plate. The bottom surface of the material plate mounting base plate... The base plate is supported against the upper surface of the material plate support block. The front and rear walls of the drying chamber are respectively equipped with base plate rotating guide wheels. The base plate traction steel rope is wound on the base plate rotating guide wheels. One end of the base plate traction steel rope extends into the drying chamber and extends downward to the middle of the front and rear ends of the material plate turning base plate. The other end of the base plate traction steel rope is located outside the drying chamber and extends downward to be equipped with a base plate counterweight. The base plate counterweight is provided with counterweight limit baffles on both sides. The counterweight limit baffles are fixed to the outer wall of the drying chamber. A lower limit plate of the counterweight is also provided below the base plate counterweight. A counterweight trigger electromagnet is provided between the lower limit plate of the counterweight and the bottom end of the base plate counterweight.

[0014] As a preferred technical solution, the low-temperature material plate turning mechanism further includes a turning trigger block. The turning trigger block is fixed on the front and rear inner walls of the drying oven and is located at the mating surface between the left and right material plate mounting bases. It can simultaneously trigger the turning of the two material plate mounting bases. Turning electromagnets are correspondingly provided on the front and rear inner walls of the drying oven at the lower left and right outer ends of the material plate mounting bases. When the turning electromagnets are energized, they can magnetically hold the corresponding material plate mounting bases in a figure-eight shape.

[0015] As a preferred technical solution, the dehumidification circulating lifting device includes two cooperating circulating lifting wheels. The two ends of the circulating lifting wheels are rotatably mounted on the front and rear inner walls of the drying chamber. Multiple circulating lifting plates are arranged on the outer periphery of the circulating lifting wheels. The circulating lifting plates are used to lift the grains that are tilted and sliding down the guide plate of the dehumidification drying chamber toward the top of the guide plate. A lifting motor is installed on the outer wall of the drying chamber. The output shaft of the lifting motor is fixedly connected to one of the circulating lifting wheels. The two circulating lifting wheels are connected by gear transmission.

[0016] As a preferred technical solution, the dehumidification hot air system includes dehumidification air inlets located on the left and right side walls of the drying chamber. The dehumidification air inlets are located above the dehumidification drying chamber guide plate and below the low-temperature electric auxiliary heating plate. Dehumidification air outlets are provided on the front and rear side walls of the drying chamber, and the dehumidification air outlets are located above the dehumidification circulating lifting device.

[0017] As a preferred technical solution, the low-temperature electric auxiliary heating material plate has the same structure as the high-temperature electric auxiliary heating material plate, and the low-temperature material plate turning mechanism has the same structure as the high-temperature material plate turning mechanism.

[0018] As a preferred technical solution, the low-temperature drying chamber guide plate has the same structure as the dehumidifying drying chamber guide plate, the low-temperature hot air system has the same structure as the dehumidifying hot air system, and the low-temperature circulating lifting device has the same structure as the dehumidifying circulating lifting device.

[0019] As a preferred technical solution, the low-temperature cooling system includes a low-temperature cold air inlet and a low-temperature cold air outlet. The low-temperature cold air inlet is located on the front and rear side walls of the drying oven, and the low-temperature cold air outlet is located on the left and right side walls of the drying oven.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. This invention is divided into multiple drying chambers. Grains are moved and dried from top to bottom. When the grains are switched between drying chambers, they can be turned over to ensure the uniformity of drying. At the same time, the upper and lower layers of grains are separated and do not mix. The grains in the bottom layer have basically the same moisture content. At this time, the grains discharged from the outlet have the same moisture content, which can accurately represent the degree of drying of the last discharged grains and is easy for the operator to observe with the naked eye.

[0022] 2. In this invention, because multiple chambers are arranged and the space of each chamber is small, the amount of material fed at one time is small. A small amount of grain is dried step by step from top to bottom, and stays in each chamber for a period of time for targeted dehumidification and drying. This incremental and decremental heating and cooling method can effectively prevent the grain from bursting or scorching, and its drying speed is significantly accelerated.

[0023] 3. As the grains flow downwards in stages, once the top layer of grains has moved to the next layer, more grains can be added to the top layer. By controlling the time interval between the upper and lower layers, continuous feeding and discharging can be achieved, ensuring uninterrupted drying operations. Unlike existing technologies, which require waiting for one batch of grains to be completely dried before drying the next batch, this staged drying and continuous feeding method ensures the drying capacity per unit time.

[0024] 4. This invention combines electric heating drying with hot air dehumidification drying. Electric heating drying can quickly raise the temperature through direct contact, resulting in faster drying. However, due to the poor fluidity of grains, the removal of moisture between grains is ineffective. Therefore, hot air drying is added after electric heating drying. Because hot air has good fluidity, it can not only dry the grains evenly with hot air, but also effectively remove moisture between grains quickly. This invention combines the advantages of both electric heating drying and hot air drying, and the two drying methods are reasonably arranged to achieve faster drying speed, more uniform drying, and better dehumidification.

[0025] 5. This device does not have a power unit in the low-temperature electric auxiliary preheating chamber and the high-temperature electric auxiliary drying chamber. It uses the weight of the counterweight and the grain to achieve automatic lifting and turning. Only the hot air dehumidification drying chamber and the hot air low-temperature drying chamber have motors to drive the rotation of the circulating lifting wheel. Since the amount of grain rotating in the circulating lifting wheel is small, the power required is also less. Compared with the existing technology that uses 3-4 hours of uninterrupted high-power rotation drive, the driving power consumption of this device is significantly reduced. It does not need to rely on electric cylinders, hydraulic cylinders and other devices, and its cost is also lower. Attached Figure Description

[0026] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0029] Figure 3 This is a schematic diagram of the structure of the low-temperature material plate turning mechanism according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of an embodiment of the present invention showing grains sliding down from the side of a low-temperature electric auxiliary heating plate into a hot air dehumidification and drying chamber;

[0031] In the diagram: 1-Drying oven; 11-Inlet; 12-Outlet; 2-Low-temperature electric auxiliary preheating chamber; 21-Material plate mounting base; 22-Material plate electric heating tube; 23-Receiving and heat-conducting material plate; 24-Z-type support; 25-Anti-scorching isolation chamber; 26-Material plate baffle plate; 27-Material plate guide plate; 28-Rubber skirt; 29-Material plate flipping base; 210-Base plate limiting guide groove; 211-Base plate limiting guide block; 212-Base plate lower limiting plate; 213-Material plate hinge seat; 214-Material plate rotating shaft; 215-Material plate support block; 216-Base plate rotating guide wheel; 217-Base plate traction steel. 218 - Rope; 219 - Baseboard counterweight; 220 - Counterweight trigger electromagnet; 221 - Flipping trigger stop; 222 - Flipping electromagnet; 3 - Hot air dehumidification drying chamber; 31 - Dehumidification drying chamber guide plate; 32 - Dehumidification drying chamber discharge port; 33 - Circulating lifting wheel; 34 - Circulating lifting plate; 35 - Dehumidification air inlet; 36 - Dehumidification air outlet; 4 - High temperature electric auxiliary drying chamber; 41 - High temperature electric auxiliary heating plate; 5 - Hot air low temperature drying chamber; 51 - Low temperature drying chamber guide plate; 6 - Cooling storage chamber; 61 - Low temperature cold air inlet; 62 - Low temperature cold air outlet. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0033] like Figures 1 to 4 As shown, a graded continuous grain drying and dehydration equipment is used for drying grains. It includes a drying chamber 1, which, from top to bottom, comprises a low-temperature electric auxiliary preheating chamber 2, a hot air dehumidification drying chamber 3, a high-temperature electric auxiliary drying chamber 4, a hot air low-temperature drying chamber 5, and a cooling storage chamber 6. In this invention, multiple drying chambers are separated, and the grains move downwards and are dried sequentially from top to bottom. When switching between drying chambers, the grains can be turned over to ensure uniform drying. Simultaneously, the upper and lower layers of grains are separated and do not mix. The grains in the bottom layer have essentially the same moisture content, resulting in grains with the same moisture content discharged from the outlet. This accurately represents the degree of drying of the finally discharged grains, facilitating visual observation by the operator.

[0034] The grains used in this patent can be soybeans, rice, etc. The drying temperature of soybeans is generally around 50℃. To avoid direct high-temperature heating of soybeans with high moisture content, the soybeans entering the low-temperature electric auxiliary preheating chamber 2 are first preheated and dried, with the grain temperature reaching 35℃ and preheating continuously for 30 minutes. After continuous preheating, the soybeans are dry and produce a large amount of moisture. Then, they enter the hot air dehumidification drying chamber 3 for drying and dehumidification. The soybeans circulate within the hot air dehumidification drying chamber 3, and during this circulation, hot air dries and dehumidifies the flowing soybeans, effectively removing the moisture produced by the soybeans, resulting in a better drying effect. Inside the hot air dehumidification drying chamber 3, the grain temperature can reach 45℃ and be maintained for 30 minutes. The soybeans are continuously dried and dehumidified by hot air. Then, they enter the high-temperature electric auxiliary drying chamber 4 for high-temperature drying, where the grain temperature can reach 50℃ and be maintained for 20 minutes. After continuous heating and drying, the soybeans enter the hot air low-temperature drying chamber 5 for hot air drying and cooling, where the grain temperature can reach 40℃ and be maintained for 30 minutes. After drying and cooling, the soybeans enter the cooling storage chamber 6 for cooling, where the grain temperature can reach 30℃ and be maintained for 10 minutes. In the entire equipment, the soybeans are first dried at low temperature, then gradually dried at high temperature, then dried at low temperature, and finally cooled, which can meet the requirements of soybean quality and drying efficiency.

[0035] Because this invention features multiple chambers, each with a relatively small space, the amount of grain fed at one time is small. A small amount of grain is dried step-by-step from top to bottom, remaining in each chamber for a period of time for targeted dehumidification and drying. This incremental heating and cooling method effectively prevents the grain from cracking or scorching, and significantly accelerates the drying speed. Furthermore, as the grain flows downwards, once the top layer moves to the next layer, more grain can be added to the top layer. By controlling the time interval between the upper and lower layers, continuous feeding and discharging can be achieved, ensuring uninterrupted drying operation. Unlike existing technologies, which require waiting for one batch of grain to be completely dried before drying the next, this invention's tiered drying and continuous feeding method guarantees the drying volume per unit time.

[0036] This invention combines electric heating drying with hot air dehumidification drying. Electric heating drying can quickly raise the temperature through direct contact, resulting in faster drying. However, due to the poor fluidity of grains, the removal of moisture between grains is ineffective. Therefore, hot air drying is added after electric heating drying. Because hot air has good fluidity, it can not only dry the grains evenly with hot air, but also effectively remove moisture between grains quickly. This invention combines the advantages of both electric heating drying and hot air drying, and the two drying methods are rationally arranged to achieve faster drying speed, more uniform drying, and better dehumidification.

[0037] The drying chamber 1 has a rectangular box structure. The top of the drying chamber 1 has a feed inlet 11, and the bottom has a discharge outlet 12. The feed inlet 11 is used to add grains, which can be added manually (non-mechanically) or via a feeding auger. The discharge outlet 12 can be equipped with a discharge valve. Bags can be placed directly below the discharge valve for bagging, or a conveyor belt can be placed to feed the grain into the grain bin. For easy observation of the interior, each chamber of the drying chamber 1 has an openable and closable observation window. The feed inlet 11 of the drying chamber 1 also has a V-shaped guide plate. The first layer of V-shaped guide plates and the two second layer of V-shaped guide plates are staggered to ensure that the material entering the chamber is evenly distributed, achieving a flat distribution. Multiple layers of V-shaped guide plates can also be used to meet various requirements. The feed inlet 11 is also equipped with a cover, which is fastened after feeding is complete.

[0038] Two low-temperature electric auxiliary heating plates are provided and arranged side by side. When the two low-temperature electric auxiliary heating plates are horizontally connected, the two low-temperature electric auxiliary heating plates cooperate to isolate the low-temperature electric auxiliary preheating chamber 2 from the hot air dehumidification drying chamber 3. The upper surface of the two low-temperature electric auxiliary heating plates is used to receive and cover the grains for low-temperature preheating and drying. When the two low-temperature electric auxiliary heating plates are in a figure-eight shape, the grains dried on the upper surface of the two low-temperature electric auxiliary heating plates slide down from the left and right sides and flow into the hot air dehumidification drying chamber 3. A low-temperature plate turning mechanism is provided between the drying box 1 and the two low-temperature electric auxiliary heating plates to switch the two horizontally connected low-temperature electric auxiliary heating plates to a figure-eight shape. Both of the low-temperature electric auxiliary heating plates in this equipment are rectangular. When the two rectangular low-temperature electric auxiliary heating plates are placed horizontally and connected to each other, their area is slightly smaller than the cross-sectional rectangle of the drying chamber 1. At this time, the grain entering the interior through the feed inlet 11 is received by the two low-temperature electric auxiliary heating plates and undergoes direct preheating and drying in contact. After drying for a certain period of time, the low-temperature plate turning mechanism controls the state switching, and the two horizontally connected low-temperature electric auxiliary heating plates switch to a figure-eight shape. The left and right ends of the low-temperature electric auxiliary heating plates tilt downwards, and the grain on the low-temperature electric auxiliary heating plates flows downwards from the left and right ends into the hot air dehumidification drying chamber 3 below. See the figure-eight turning state for details. Figure 4 Here, the low-temperature electric auxiliary heating material plate is raised and lowered by the weight of the counterweight and the grain, and the low-temperature electric auxiliary heating material plate is controlled to achieve horizontal and tilted states. This non-powered material turning method can reduce the power consumption of the equipment, does not require the use of electric cylinders, hydraulic cylinders and other devices, and its cost is also low.

[0039] The low-temperature electric auxiliary heating plates on both sides have the same structure, the main difference being their placement and tilting / rotation direction. Each low-temperature electric auxiliary heating plate includes a material plate mounting base 21. Several material plate electric heating tubes 22 are mounted on the upper surface of the material plate mounting base 21. A receiving heat-conducting material plate 23 is mounted correspondingly above the material plate electric heating tubes 22. The receiving heat-conducting material plate 23 is fixedly connected to the material plate mounting base 21 by several Z-shaped support members 24. The top end of each Z-shaped support member 24 is fixedly connected to the receiving heat-conducting material plate 23, and the bottom end of each Z-shaped support member 24 is fixedly connected to the material plate mounting base 21. A scorching-proof isolation cavity 25 is formed between the material plate mounting base 21 and the material plate. Material plate baffles 26 are fixed to the front and rear ends of the receiving heat-conducting material plate 23. Material plate guide plates 27 are fixedly installed on the left and right inner walls of the drying chamber 1. The bottom end of the material plate guide plate 27 extends downward at an angle to block the gap between the end of the receiving heat-conducting material plate 23 and the inner wall of the drying chamber 1. A rubber skirt 28 is fixedly installed at the bottom end of the material plate guide plate 27, and the bottom end of the rubber skirt 28 abuts against the upper surface of the receiving heat-conducting material plate 23. A plurality of material plate electric heating tubes 22 are spaced apart and spread across the material plate mounting base 21. The power lines of the material plate electric heating tubes 22 pass through the front and rear walls of the drying chamber 1, and the ends of the power lines are located below the receiving heat-conducting material plate 23. The routing of the power lines is not affected when the receiving heat-conducting material plate 23 moves up and down. In this embodiment, the Z-shaped support 24 is used to connect the receiving heat-conducting material plate 23 and the material plate mounting base 21, forming an anti-scorching isolation cavity 25 between them. The material plate electric heating tube 22 is installed on the material plate mounting base 21. The material plate electric heating tube 22 does not contact the receiving heat-conducting material plate 23, but heats the receiving heat-conducting material plate 23 through thermal radiation, and then heats the grains placed on the surface. At this time, the heating method of thermal radiation can make the overall temperature of the surface of the receiving heat-conducting material plate 23 as uniform as possible, and there will be no local areas that are too hot. However, if the material plate electric heating tube 22 is directly connected to the surface of the receiving heat-conducting material plate 23, the position where it directly contacts the material plate electric heating tube 22 will be too high, which will cause the grains at this position to be heated to a higher temperature, resulting in scorching and cracking of the grains, and making it impossible to achieve uniform drying. The material plate mounting base plate 21 and the material receiving and heat-conducting material plate 23 are sealed around the anti-scorching isolation cavity 25 by a sealing plate to prevent grain from entering the anti-scorching isolation cavity 25.Simultaneously, when the two mounting base plates 21 are horizontal, when the grains fall onto the surface, due to the good rolling properties of soybeans, they will flow towards the inner wall of the drying chamber 1 and easily flow out through the gap between the receiving heat-conducting plate 23 and the inner wall of the drying chamber 1. Therefore, the receiving heat-conducting plate 23 is provided with a material plate baffle plate 26 at its front and rear ends, and the height of the material plate baffle plate 26 is higher than the flat height of the grains. At the same time, the receiving heat-conducting plate 23 is provided with rubber skirts 28 above the left and right ends. The bottom end of the skirt plate 28 contacts the upper surface of the receiving and heat-conducting material plate 23, which can achieve a sealing effect. The front and rear ends of the material plate guide plate 27 and the rubber skirt plate 28 abut against the material plate baffle plate 26, and together they form a cavity structure that can completely place the grain on the surface. The rubber skirt plate 28 is flexible, so when the receiving and heat-conducting material plate 23 contacts the rubber skirt plate 28 from above, it will not cause impact to the receiving and heat-conducting material plate 23. The rubber skirt plate 28 is made of a high-temperature resistant structure.

[0040] The low-temperature material plate turning mechanism includes a material plate turning base plate 29. Two base plate limiting uprights are correspondingly provided on the front and rear inner walls of the drying oven 1. A vertical base plate limiting guide groove 210 is formed between the two base plate limiting uprights. Base plate limiting guide blocks 211 that slide up and down along the base plate limiting guide groove 210 are provided at both ends of the material plate turning base plate 29. A base plate lower limiting plate 212 is also correspondingly provided below the base plate limiting guide blocks 211. A material plate hinge seat 213 is installed on the left end of the top surface of the material plate turning base plate 29. A material plate rotating shaft 214 is provided at the bottom end of the material plate mounting base 21, and the material plate rotating shaft 214 is rotatably mounted on the material plate hinge seat 213. A material plate support block 215 is fixed to the right end of the top surface of the material plate turning base plate 29. The bottom surface of the material plate mounting base 21 abuts against the material plate... On the upper surface of the plate support block 215, on the front and rear walls of the drying chamber 1, a base plate rotating guide wheel 216 is respectively installed. A base plate traction steel rope 217 is wound on the base plate rotating guide wheel 216. One end of the base plate traction steel rope 217 extends into the drying chamber 1 and extends downward to the middle of the front and rear ends of the material plate turning base plate 29. The other end of the base plate traction steel rope 217 is located outside the drying chamber 1 and extends downward to install a base plate counterweight block 218. Counterweight block limiting baffles are provided on both sides of the base plate counterweight block 218. The counterweight block limiting baffles are fixed to the outer wall of the drying chamber 1. A counterweight block lower limiting plate 219 is also provided below the base plate counterweight block 218. A counterweight block triggering electromagnet 220 is provided between the lower limiting plate 219 and the bottom end of the base plate counterweight block 218. In use, the counterweight trigger electromagnet 220 is energized, attracting the substrate counterweight 218 to remain stationary. At this time, the low-temperature electric auxiliary heating plate remains in this position without change. Then, a certain amount of grain is added to the surface of the low-temperature electric auxiliary heating plate and held in this position for 30 minutes to preheat and dry the grain. After 30 minutes, the counterweight trigger electromagnet 220 is de-energized, and the low-temperature electric auxiliary heating plate carrying the grain pulls the substrate counterweight 218 downward, causing the substrate counterweight 218 to move upward. At this time, the substrate limiting guide block 211 slides downward along the substrate limiting guide groove 210, realizing the automatic descent of the low-temperature electric auxiliary heating plate.

[0041] The low-temperature material plate turning mechanism also includes a turning trigger block 221. The turning trigger block 221 is fixed on the front and rear inner walls of the drying chamber 1 and is located at the mating surface between the left and right material plate mounting base plates 21, which can simultaneously trigger the turning of the two material plate mounting base plates 21. The turning electromagnets 222 are correspondingly provided on the front and rear inner walls of the drying chamber 1 below the left and right outer ends of the material plate mounting base plates 21. When the turning electromagnets 222 are energized, they can magnetically hold the corresponding material plate mounting base plates 21 in a figure-eight shape. When the low-temperature electric auxiliary heating material plate descends and contacts the material-flipping trigger block 221, the material-flipping trigger block 221 will abut against the end of the low-temperature electric auxiliary heating material plate. At this time, the material plate flipping substrate 29 will continue to slide downward along the substrate limiting guide groove 210, and the low-temperature electric auxiliary heating material plate will rotate outward around the material plate pivot 214 and tilt. When the material plate flipping substrate 29 fully contacts the substrate lower limiting plate 212, the material plate flipping substrate 29 stops descending. At this time, the tilt angle of the low-temperature electric auxiliary heating material plate reaches its maximum, and the grain flows downward along the tilted surface. When a large amount of grain flows down, in order to prevent the substrate counterweight block 218 from pulling the entire device upward, a [missing information] is provided. When the material plate turning base plate 29 stops, the bottom end of the low-temperature electric auxiliary heating material plate contacts the turning electromagnet 222. At this time, the turning electromagnet 222 is energized. The material plate mounting base plate 21 is a metal plate and is attracted by the turning electromagnet 222, keeping it in this position for a few minutes, so that the grains on the surface can slide down completely. When the grains have slid down completely, the turning electromagnet 222 is de-energized, and the low-temperature electric auxiliary heating material plate is driven upward by the base plate counterweight block 218. When it is no longer restricted by the turning trigger block 221, the low-temperature electric auxiliary heating material plate gradually returns to a horizontal state until the base plate counterweight block 218 contacts the counterweight block trigger electromagnet 220 and stops. The connection point between the substrate counterweight 218 and the low-temperature electric auxiliary heating material plate is located in the middle of the low-temperature electric auxiliary heating material plate. The material plate hinge seat 213 is located at the left third, and the material plate support block 215 is located at the right third. When the tilting electromagnet 222 is de-energized and is no longer restricted by the tilting trigger stop 221, the low-temperature electric auxiliary heating material plate can naturally return to a horizontal state under its own weight. The tilting electromagnet 222 is tilted so that it completely fits the surface of the material plate mounting substrate 21 when it is tilted, resulting in good attraction.

[0042] One dehumidifying drying chamber guide plate 31 is provided on each of the left and right sides of the drying chamber 1. The two dehumidifying drying chamber guide plates 31 are arranged in a V-shape to isolate the hot air dehumidifying drying chamber 3 from the high-temperature electric auxiliary drying chamber 4. A dehumidifying drying chamber discharge port 32 is provided between the bottom ends of the two dehumidifying drying chamber guide plates 31. A dehumidifying circulating lifting device is provided at the dehumidifying drying chamber discharge port 32. A dehumidifying hot air system is provided on the drying chamber 1 corresponding to the hot air dehumidifying drying chamber 3. The dehumidifying drying chamber guide plates 31 are inclined downwards, and the grains above are arranged along the left and right sides. When the grain slides down the wall, it falls onto the top of the dehumidifying drying chamber guide plate 31. Then it can slide down the dehumidifying drying chamber guide plate 31 and finally enter the dehumidifying circulating lifting device. The dehumidifying circulating lifting device lifts the grain in the opposite direction towards the upper part of the dehumidifying drying chamber guide plate 31. During the lifting process, the dehumidifying hot air system enters hot air to dry the flowing grain and remove all the moisture generated on the surface of the grain. Since the grain is in a dispersed state at this time, the drying and dehumidification effect is better, and the purpose of rapid dehumidification and drying can be achieved.

[0043] The dehumidification circulating lifting device includes two cooperating circulating lifting wheels 33. The two ends of the circulating lifting wheels 33 are rotatably mounted on the front and rear inner walls of the drying chamber 1. Multiple circulating lifting plates 34 are arranged on the outer periphery of the circulating lifting wheels 33. The circulating lifting plates 34 are perpendicular to the circulating lifting wheels 33. The circulating lifting plates 34 are used to lift the grains that are tilted and sliding down the dehumidification drying chamber guide plate 31 toward the top of the dehumidification drying chamber guide plate 31. A lifting motor is installed on the outer wall of the drying chamber 1. The output shaft of the lifting motor is fixedly connected to one of the circulating lifting wheels 33. The two circulating lifting wheels 33 are connected by gear transmission. During the lifting process, both circulating lifting wheels 33 rotate outward at high speed simultaneously, i.e., the left circulating lifting wheel 33 rotates counterclockwise and the right circulating lifting wheel 33 rotates clockwise. This lifts the grain flowing down towards the center to the left and right sides respectively. After lifting for 30 minutes, when drying is complete, the two circulating lifting wheels 33 rotate in opposite directions at a slow speed. This disperses and guides the grain sliding down the dehumidification drying chamber guide plate 31 to the horizontal high-temperature electric auxiliary heating plate below, achieving the purpose of spreading the grain as evenly as possible on the high-temperature electric auxiliary heating plate. After spreading, when the next wave of grain dehumidification and drying is carried out, the two circulating lifting wheels 33 continue to rotate.

[0044] The dehumidifying hot air system includes dehumidifying air inlets 35 located on the left and right side walls of the drying chamber 1. These inlets 35 are positioned above the dehumidifying drying chamber guide plate 31 and below the low-temperature electric auxiliary heating plate. Dehumidifying air outlets 36 are located on the front and rear side walls of the drying chamber 1, above the dehumidifying circulating material lifting device. Hot air enters through the dehumidifying air inlets 35, contacting the grains within the chamber to achieve drying and dehumidification. A blower is installed at the dehumidifying air outlets 36 to draw the humid air outwards, where it is further processed through filters and condensers.

[0045] Two high-temperature electric auxiliary heating plates 41 are provided and arranged side by side. When the two high-temperature electric auxiliary heating plates 41 are horizontally connected, they cooperate to isolate the high-temperature electric auxiliary drying chamber 4 from the hot air low-temperature drying chamber 5. The upper surfaces of the two high-temperature electric auxiliary heating plates 41 are used to receive and dry the grains at high temperature. When the two high-temperature electric auxiliary heating plates 41 are in a V-shape, the dried grains on the upper surfaces of the two high-temperature electric auxiliary heating plates 41 slide down from the left and right sides and flow into the hot air low-temperature drying chamber 5. A high-temperature plate turning mechanism is provided between the drying box 1 and the high-temperature electric auxiliary heating plates 41 to switch the two horizontally connected high-temperature electric auxiliary heating plates 41 to a V-shape. The low-temperature electric auxiliary heating plate has the same structure as the high-temperature electric auxiliary heating plate 41, and the low-temperature plate turning mechanism has the same structure as the high-temperature plate turning mechanism, only the position is different. The specific structure will not be described in detail.

[0046] One low-temperature drying chamber guide plate 51 is provided on each of the left and right sides of the drying chamber 1, and the two low-temperature drying chamber guide plates 51 are arranged in a V-shape to isolate the hot air low-temperature drying chamber 5 from the cooling storage chamber 6. A low-temperature drying chamber discharge port is provided between the bottom ends of the two low-temperature drying chamber guide plates 51. A low-temperature circulating lifting device is provided at the low-temperature drying chamber discharge port. A low-temperature hot air system is provided on the drying chamber 1 corresponding to the hot air low-temperature drying chamber 5. The low-temperature drying chamber guide plate 51 has the same structure as the dehumidifying drying chamber guide plate 31, the low-temperature hot air system has the same structure as the dehumidifying hot air system, and the low-temperature circulating lifting device has the same structure as the dehumidifying circulating lifting device, only the location is different. The specific structure will not be described in detail.

[0047] The cooling storage chamber 6 contains a V-shaped discharge hopper, with the discharge port 12 located at the bottom of the V-shaped discharge hopper. A low-temperature cooling system is installed on the drying chamber 1 corresponding to the cooling storage chamber 6. The low-temperature cooling system includes a low-temperature cold air inlet 61 and a low-temperature cold air outlet 62. The low-temperature cold air inlet 61 is located on the front and rear side walls of the drying chamber 1, and the low-temperature cold air outlet 62 is located on the left and right side walls of the drying chamber 1. The cooling storage chamber 6 is used to cool the grain. When the grain flows downwards from the middle between the two low-temperature drying chamber guide plates 51, cold air enters to cool the downward-flowing grain. The grain remains in this chamber for a period of time to cool, and is discharged when it needs to be unloaded.

[0048] This device does not have a power unit in the low-temperature electric auxiliary preheating chamber 2 and the high-temperature electric auxiliary drying chamber 4. It uses the weight of the counterweight and the grain to achieve automatic lifting and turning. Only the hot air dehumidification drying chamber 3 and the hot air low-temperature drying chamber 5 have motors to drive the rotation of the circulating lifting wheel 33. Since the amount of grain rotating in the circulating lifting wheel 33 is small, the power required is also small. Compared with the existing technology that uses 3-4 hours of uninterrupted high-power rotation drive, the driving power consumption of this device is significantly reduced.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A graded continuous grain drying and dehydration equipment for drying grains, comprising a drying chamber, characterized in that: The drying chamber is arranged from top to bottom as follows: a low-temperature electric auxiliary preheating chamber, a hot air dehumidification drying chamber, a high-temperature electric auxiliary drying chamber, a hot air low-temperature drying chamber, and a cooling storage chamber. A drying oven, wherein the top of the drying oven is provided with a feed inlet and the bottom of the drying oven is provided with a discharge outlet; Two low-temperature electric auxiliary heating plates are provided and arranged side by side. When the two low-temperature electric auxiliary heating plates are horizontally connected, the two low-temperature electric auxiliary heating plates cooperate to isolate the low-temperature electric auxiliary preheating chamber from the hot air dehumidification drying chamber. The upper surface of the two low-temperature electric auxiliary heating plates is used to receive and cover the grains for low-temperature preheating and drying. When the two low-temperature electric auxiliary heating plates are in a figure-eight shape, the grains dried on the upper surface of the two low-temperature electric auxiliary heating plates slide down from the left and right sides and flow into the hot air dehumidification drying chamber. A low-temperature plate turning mechanism is provided between the drying box and the two low-temperature electric auxiliary heating plates to switch the two horizontally connected low-temperature electric auxiliary heating plates to a figure-eight shape. A dehumidifying drying chamber guide plate is provided on each of the left and right sides of the drying box. The two dehumidifying drying chamber guide plates are arranged in a V-shape to isolate the hot air dehumidifying drying chamber from the high-temperature electric auxiliary drying chamber. A dehumidifying drying chamber discharge port is provided between the bottom ends of the two dehumidifying drying chamber guide plates. A dehumidifying circulating lifting device is provided at the dehumidifying drying chamber discharge port. A dehumidifying hot air system is provided on the drying box corresponding to the hot air dehumidifying drying chamber. Two high-temperature electric auxiliary heating plates are provided and arranged side by side. When the two high-temperature electric auxiliary heating plates are horizontally connected, the two high-temperature electric auxiliary heating plates cooperate to isolate the high-temperature electric auxiliary drying chamber from the hot air low-temperature drying chamber. The upper surface of the two high-temperature electric auxiliary heating plates is used to receive and dry the grains at high temperature. When the two high-temperature electric auxiliary heating plates are in a figure-eight shape, the grains dried on the upper surface of the two high-temperature electric auxiliary heating plates slide down from the left and right sides and flow into the hot air low-temperature drying chamber. A high-temperature plate turning mechanism is provided between the drying box and the high-temperature electric auxiliary heating plates to switch the two horizontally connected high-temperature electric auxiliary heating plates to a figure-eight shape. A low-temperature drying chamber guide plate is provided on each of the left and right sides of the drying box. The two low-temperature drying chamber guide plates are arranged in a V-shape to isolate the hot air low-temperature drying chamber from the cooling storage chamber. A low-temperature drying chamber discharge port is provided between the bottom ends of the two low-temperature drying chamber guide plates. A low-temperature circulating lifting device is provided at the low-temperature drying chamber discharge port. A low-temperature hot air system is provided on the drying box corresponding to the hot air low-temperature drying chamber. The cooling storage chamber is a V-shaped discharge hopper, and the discharge port is located at the bottom of the V-shaped discharge hopper. The drying box is equipped with a low-temperature cooling system corresponding to the cooling storage chamber.

2. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The low-temperature electric auxiliary heating material plate includes a material plate mounting base. A plurality of material plate electric heating tubes are mounted on the upper surface of the material plate mounting base. A receiving heat-conducting material plate is mounted above the material plate electric heating tubes. The receiving heat-conducting material plate and the material plate mounting base are fixedly connected by a Z-shaped support. A scorching prevention isolation cavity is formed between the receiving heat-conducting material plate and the material plate mounting base. Material plate baffle plates are fixed at both the front and rear ends of the receiving heat-conducting material plate. Material plate guide plates are fixedly mounted on the left and right inner walls of the drying chamber. The bottom end of the material plate guide plate extends downwards at an angle, blocking the gap between the end of the corresponding receiving heat-conducting material plate and the inner wall of the drying chamber. A low-temperature rubber skirt is fixedly mounted at the bottom end of the material plate guide plate, and the bottom end of the low-temperature rubber skirt abuts against the upper surface of the receiving heat-conducting material plate.

3. The graded continuous grain drying and dehydration equipment as described in claim 2, characterized in that: The low-temperature material plate turning mechanism includes a material plate turning base plate. Two base plate limiting uprights are correspondingly provided on the front and rear inner walls of the drying oven. A vertical base plate limiting guide groove is formed between the two base plate limiting uprights. Base plate limiting guide blocks that slide up and down along the base plate limiting guide groove are provided at both ends of the material plate turning base plate. A base plate lower limiting plate is also correspondingly provided below the base plate limiting guide blocks. A material plate hinge seat is installed on the left end of the top surface of the material plate turning base plate. A material plate rotating shaft is provided at the bottom end of the material plate mounting base plate. The material plate rotating shaft is rotatably mounted on the material plate hinge seat. A material plate support block is fixed to the right end of the top surface of the material plate turning base plate. The bottom surface of the material plate mounting base plate abuts against the... On the upper surface of the material plate support block, and on the front and rear walls of the drying chamber, substrate rotating guide wheels are respectively installed. A substrate traction steel rope is wound on the substrate rotating guide wheel. One end of the substrate traction steel rope extends into the drying chamber and extends downward to the middle of the front and rear ends of the material plate turning substrate. The other end of the substrate traction steel rope is located outside the drying chamber and extends downward to install a substrate counterweight. Counterweight limit baffles are provided on both sides of the substrate counterweight. The counterweight limit baffles are fixed to the outer wall of the drying chamber. A lower limit plate of the counterweight is also provided below the substrate counterweight. A counterweight trigger electromagnet is provided between the lower limit plate of the counterweight and the bottom end of the substrate counterweight.

4. The graded continuous grain drying and dehydration equipment as described in claim 3, characterized in that: The low-temperature material plate turning mechanism also includes a turning trigger block. The turning trigger block is fixed on the front and rear inner walls of the drying oven and is located at the mating surface between the left and right material plate mounting bases. It can simultaneously trigger the turning of the two material plate mounting bases. The front and rear inner walls of the drying oven are provided with turning electromagnets corresponding to the lower left and right outer ends of the material plate mounting bases. When the turning electromagnets are energized, they can magnetically hold the corresponding material plate mounting bases in a figure-eight shape.

5. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The dehumidification circulating lifting device includes two cooperating circulating lifting wheels. The two ends of the circulating lifting wheels are rotatably mounted on the front and rear inner walls of the drying chamber. Multiple circulating lifting plates are arranged on the outer periphery of the circulating lifting wheels. The circulating lifting plates are used to lift the grains that are tilted and sliding down the guide plate of the dehumidification drying chamber toward the top of the guide plate. A lifting motor is installed on the outer wall of the drying chamber. The output shaft of the lifting motor is fixedly connected to one of the circulating lifting wheels. The two circulating lifting wheels are connected by gear transmission.

6. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The dehumidification hot air system includes dehumidification air inlets located on the left and right side walls of the drying chamber. The dehumidification air inlets are located above the dehumidification drying chamber guide plate and below the low-temperature electric auxiliary heating plate. Dehumidification air outlets are provided on the front and rear side walls of the drying chamber. The dehumidification air outlets are located above the dehumidification circulating lifting device.

7. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The low-temperature electric auxiliary heating material plate has the same structure as the high-temperature electric auxiliary heating material plate, and the low-temperature material plate turning mechanism has the same structure as the high-temperature material plate turning mechanism.

8. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The low-temperature drying chamber guide plate has the same structure as the dehumidifying drying chamber guide plate, the low-temperature hot air system has the same structure as the dehumidifying hot air system, and the low-temperature circulating lifting device has the same structure as the dehumidifying circulating lifting device.

9. The graded continuous grain drying and dehydration equipment as described in claim 1, characterized in that: The low-temperature cooling system includes a low-temperature cold air inlet and a low-temperature cold air outlet. The low-temperature cold air inlet is located on the front and rear side walls of the drying oven, and the low-temperature cold air outlet is located on the left and right side walls of the drying oven.

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