A drying and screening apparatus

Abstract

The application relates to the field of grain drying and screening, and in particular to a drying and screening device which comprises a drying mechanism and a screening mechanism, the drying mechanism comprises a hot air assembly, a stirring assembly and a drying cylinder, the air outlet of the hot air assembly is communicated with the drying cylinder, the stirring assembly is arranged in the drying cylinder and used for stirring grains, the screening mechanism comprises a wind collecting box, a vibrating screen with screen holes and a lifting assembly, the discharge end of the drying cylinder is communicated with the feeding end of the wind collecting box, the wind collecting box is respectively provided with a fine particle discharge port and a coarse particle discharge port, the vibrating screen is arranged in an inclined mode, one end of the vibrating screen is fixed to the wind collecting box, and the other end is slidably arranged at the coarse particle discharge port of the wind collecting box, and the lifting assembly pushes the vibrating screen to slide to shake out the grains in the screen holes. The structure can realize integrated automatic processing of grain drying and screening, improve the grain drying uniformity, effectively prevent the problem that the grains are easily adhered to the screen plate and cause the screen holes to be blocked, and thus the screening precision and the processing efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of grain drying and screening, and in particular to a drying and screening device. Background Technology

[0002] In the field of agricultural product processing technology, grains require crucial steps such as drying, screening, and impurity removal. With the acceleration of agricultural modernization and the continuous expansion of agricultural production scale, the demand for large-scale processing of small-particle grains, such as [specific grains], is experiencing rapid growth. This increased demand not only concerns the improvement of agricultural product quality and yield assurance but also has a profound impact on the economic benefits of various agricultural production and management entities, including agricultural cooperatives, grain processing plants, and family farms. Efficient drying and screening technologies for small-particle grains can significantly increase the added value of agricultural products, enhance market competitiveness, and promote the sustainable development of the agricultural industry.

[0003] For large-scale processing of small grain particles, existing methods typically employ single-function equipment to sequentially perform drying, screening, and impurity removal. In the drying stage, hot air is commonly blown directly into the drying drum containing the grain in a hot air furnace. The dried grain is then manually poured into a screening device consisting of a drive motor and a vibrating screen. The vibrating screen primarily uses the vibration of the screen plates to separate grains of different sizes. Fine-sized grains fall through the screen openings and are collected below, while coarse-sized grains, unable to pass through the openings, remain on the screen and are collected from the discharge end, thus achieving grain grading. The screened grain is then manually transferred to an impurity removal device to remove dust and fine impurities. However, for small grain particles with high moisture content, wet grains easily adhere to the screen plates, causing screen blockage. Furthermore, this method struggles to accurately separate impurities with similar particle sizes to the grain. Air separation uses wind power to separate lighter impurities from the grain; however, its separation effect is very limited for impurities with densities similar to grain. Furthermore, traditional equipment has a low degree of automation, requiring significant manual intervention and making it difficult to meet the demands of large-scale continuous production. When facing large-scale processing, the large volume of grain makes it difficult for hot air to penetrate the entire grain layer evenly, resulting in some grains being overheated and damaged, while others remain insufficiently dried. However, the aforementioned methods have revealed numerous drawbacks in large-scale grain processing. On the one hand, the use of single equipment to sequentially perform grain drying, screening, and impurity removal results in low automation, leading to high labor costs and low processing efficiency. On the other hand, due to the small size of the grain particles, they are prone to clumping, causing uneven drying. Small grain particles with high moisture content easily adhere to the sieve plates, causing sieve blockage and significantly reducing the accuracy of grain grading and screening, resulting in inconsistent product quality. In addition, frequent shutdowns to clean clogged sieve plates greatly reduce production efficiency and further increase labor costs. Utility Model Content

[0004] In order to achieve integrated automatic processing of grain drying and screening, improve the uniformity of grain drying, effectively prevent grain from easily sticking to the screen plate and causing screen hole blockage, thereby improving screening accuracy and processing efficiency, this application provides a drying and screening device.

[0005] This application provides a drying and screening device, including a drying mechanism and a screening mechanism. The drying mechanism includes a hot air assembly, a stirring assembly, and a drying cylinder. The outlet of the hot air assembly is connected to the drying cylinder. The stirring assembly is disposed inside the drying cylinder for stirring grains. The screening mechanism includes an air collection box, a vibrating screen with sieve holes, and a lifting assembly. The discharge end of the drying cylinder is connected to the feed end of the air collection box. The air collection box is respectively provided with a fine particle discharge port and a coarse particle discharge port. The vibrating screen is inclined. One end of the vibrating screen is rotatably disposed in the air collection box, and the other end is slidably disposed in the coarse particle discharge port of the air collection box. The lifting assembly pushes the vibrating screen to slide to vibrate out the grains in the sieve holes. By adopting the above technical solution, the air outlet of the hot air component is connected to the drying cylinder, allowing hot air to be blown into the drying cylinder to dry the grains. Simultaneously, a stirring component is installed inside the drying cylinder to stir the grains, causing them to continuously tumble during the drying process. This disperses the grains, preventing clumping and ensuring more even contact between the hot air and the grains, thereby improving drying efficiency and ensuring uniformity. This prevents some grains from being overheated and damaged, or from remaining insufficiently dried. The dried grains enter the air collection box from the discharge end of the drying cylinder. A certain amount of hot air also flows along the grain's path into the air collection box, raising the temperature inside. The grains are then screened and dried a second time on a vibrating screen, preventing incompletely dried grains from adhering to the screen plate. The vibrating screen is tilted and rotatable at one end and around its axis at the other, sliding at the coarse grain discharge port. A lifting component pushes the vibrating screen to slide, thus dislodging the grains from the screen holes. Incompletely dried grains easily adhere to the sieve plate, causing sieve hole blockage. The sliding vibration of the vibrating screen can break the adhesion between the grains and the sieve holes, effectively preventing sieve hole blockage, ensuring smooth screening, improving screening efficiency, and accurately separating grains of different particle sizes. Fine-sized grains fall from the sieve holes to the fine particle outlet for collection, while coarse-sized grains are collected from the coarse particle outlet, achieving grain grading and screening, thereby improving product quality. Preferably, the drying cylinder includes an insulated outer cylinder and an inner cylinder. The inner cylinder is rotatably disposed inside the insulated outer cylinder and has several through holes through which grains can pass and fall onto the inner wall of the insulated outer cylinder. The insulated outer cylinder is connected to the hot air assembly and the air collection box. A switching valve is provided between the insulated outer cylinder and the air collection box to control the intermittent flow of grains to the air collection box. The stirring assembly is rotatably disposed between the inner cylinder and the insulated outer cylinder and rotates synchronously with the inner cylinder. By adopting the above technical solution, the drying cylinder is configured as an insulated outer cylinder and a rotatable inner cylinder, with the inner cylinder having several through holes. When the inner cylinder rotates, the grains continuously fall through the through holes onto the inner wall of the insulated outer cylinder, allowing the grains to be fully turned over.During this process, hot air blown from the hot air assembly enters the insulated outer cylinder. Because the grains are constantly agitated, the hot air can more evenly reach each grain, avoiding the problem in traditional drying methods where grain accumulation prevents the hot air from penetrating the entire grain layer evenly. This effectively solves the problems of some grains being overheated and damaged, and others not being fully dried, significantly improving the uniformity and effectiveness of grain drying. Simultaneously, the on / off valve on the insulated outer cylinder controls the intermittent flow of grains to the air collection box. This intermittent feeding method allows the grains sufficient time to dry within the insulated outer cylinder, ensuring that each batch of grains entering the air collection box achieves a good degree of dryness. Furthermore, the stirring assembly is rotated between the inner cylinder and the insulated outer cylinder, rotating synchronously with the inner cylinder, further enhancing the grain agitation effect. Combined with the rotation of the inner cylinder and the design of the through-holes, this keeps the grains dynamic throughout the drying process, greatly improving drying efficiency and quality. Preferably, the stirring assembly includes a grid plate and connecting rods. The grid plate is connected to the inner cylinder at both ends via the connecting rods. The grid plate has several gaps through which grains can pass. By adopting the above technical solution, the grid plate of the stirring assembly is connected to the inner cylinder at both ends via connecting rods. When the inner cylinder rotates, it drives the grid plate to rotate synchronously, thereby stirring the grains. The grid plate has several gaps through which grains can pass. During the process of passing through the gaps, the grains that were originally clumped together are broken up, preventing grain clumping. In this way, hot air can contact each grain more evenly, allowing heat to be transferred to the grains more evenly. This effectively solves the problem of some grains being overheated and others not being fully dried due to grain accumulation, thereby improving the uniformity of grain drying and the overall drying effect, ensuring the drying quality.

[0006] Preferably, the heat-insulating outer cylinder is connected to the air collection box through a diversion pipe, and a portion of the hot air is diverted into the air collection box.

[0007] By adopting the above technical solution, a portion of the hot air flows from the heat-insulating outer cylinder to the air collection box, enabling secondary drying of the grains within the air collection box and preventing incompletely dried grains from adhering to the sieve plate. Preferably, the lifting assembly includes a sliding member and a sliding drive member both disposed in the air collection box. The vibrating screen is connected to the sliding member, and the sliding drive member drives the sliding member to move, causing the vibrating screen to rotate around the other end. By adopting the above technical solution, the sliding drive member can drive the sliding member to move. Since the vibrating screen is connected to the sliding member, the movement of the sliding member will cause the vibrating screen to rotate around the end fixed to it in the air collection box, causing the vibrating screen to vibrate and thus dislodge the grains from the sieve holes. This vibration can effectively prevent grains from clogging the sieve holes, thereby ensuring the smooth progress of the screening work. In addition, compared with traditional screening methods, this method can improve screening efficiency and screening accuracy, thereby improving production efficiency and product quality. Preferably, the surface of the vibrating screen is provided with several grooves and protrusions to form an uneven surface. By adopting the above technical solution, the surface of the vibrating screen is provided with several grooves and protrusions to form an uneven surface, preventing grains from sticking to the screen plate and increasing the friction between the grains and the vibrating screen, allowing the grains to roll and move better on the vibrating screen, which is beneficial to improving screening efficiency and accuracy. Preferably, it also includes a feeding mechanism, the discharge end of which is connected to the feed end of the drying cylinder. By adopting the above technical solution, setting up a feeding mechanism with its discharge end connected to the feed end of the drying cylinder, it is possible to automatically convey the grains into the drying cylinder. Compared with the traditional manual feeding method, it reduces the workload of manual handling, saves labor costs, avoids the errors and inefficiencies that may be caused by manual operation, and allows for a continuous and stable supply of materials into the drying cylinder, providing a stable material supply for subsequent drying, screening and other processes. This helps to improve the automation level and production efficiency of the entire drying and screening equipment, meeting the needs of large-scale continuous production. Preferably, the system also includes a dust removal and recovery mechanism, which comprises a wind-driven separation component and a recovery component. The wind-driven separation component is located at the fine particle outlet of the air collection box to remove dust and light impurities, and the recovery component is located at the wind-driven separation component to recover dust and light impurities. By adopting the above technical solution, a dust removal and recovery mechanism is set in the drying and screening equipment. Utilizing the wind-driven separation component located at the fine particle outlet of the air collection box, based on the principle that wind can suspend and move lighter materials, dust and light impurities in the grain can be separated from the grain, thereby removing dust and light impurities and effectively improving the purity and quality of the grain. Simultaneously, the recovery component at the wind-driven separation component allows for timely collection and recovery of the separated dust and light impurities, preventing these impurities from being re-introduced or dispersed into the surrounding environment. This not only reduces the impact of impurities on subsequent processing, ensuring the continuity and stability of processing, but also achieves centralized treatment of impurities, which is beneficial to environmental protection and facilitates the recycling of reusable impurities, further improving resource utilization.Preferably, the system also includes a central control system, which controls the opening and closing of the switching valves and the operation of each mechanism. By adopting the above technical solution, the central control system controls the opening and closing of the switching valves and the operation of each mechanism, enabling precise adjustment of the rhythm of grain conveying from the drying drum to the air collecting box. For example, when the grain in the drying drum reaches a suitable degree of dryness, the central control system promptly opens the switching valve to allow the grain to enter the screening mechanism. Simultaneously, the central control system coordinates the operation of each mechanism, resulting in a more seamless and efficient collaboration between the drying mechanism, screening mechanism, and other components.

[0008] In summary, this application includes at least one of the following beneficial technical effects: 1. The stirring component is set inside the drying drum. During the drying process, the stirring component stirs the grains inside the drying drum, causing the originally clumped grains to disperse. In this way, the hot air can penetrate the grain layer more evenly, thus making the grains dry more evenly and effectively solving the problem of some grains being overheated and some grains not being fully dried. 2. The lifting component in the screening mechanism can slide to abut against the sliding end of the vibrating screen and push the vibrating screen to slide. During this process, the vibrating screen vibrates, thereby shaking out the grain in the screen holes. This effectively prevents small grain particles with high moisture content from sticking to the screen plate and causing screen hole blockage, thus improving the grading and screening accuracy of the grain. 3. The discharge end of the drying cylinder of the drying mechanism is connected to the feed end of the air collection box of the screening mechanism, so that the grain can automatically flow between the two mechanisms, reducing manual intervention and improving the automation level of the equipment. The drying cylinder and the air collection box are connected through a diversion pipe, which can realize the secondary drying of the grain in the air collection box. This design can meet the needs of large-scale continuous production and solve the problems of high labor costs and low processing efficiency. Attached Figure Description

[0009] Figure 1 This is an exploded view of a drying and screening device according to this application; Figure 2 This is a structural diagram of a drying and screening device according to this application; Figure 3 This is a structural diagram of the lifting component of a drying and screening device according to this application.

[0010] Explanation of reference numerals in the attached drawings: 1. Feeding mechanism; 2. Drying mechanism; 3. Screening mechanism; 4. Impurity removal and recovery mechanism; 5. Diverter pipe; 6. Machine casing; 21. Hot air assembly; 22. Mixing assembly; 23. Drying cylinder; 221. Grid plate; 222. Connecting rod; 231. Insulated outer cylinder; 232. Inner cylinder; 231a. Switch valve; 31. Air collection box; 32. Vibrating screen; 33. Lifting assembly; 311. Coarse particle outlet; 312. Fine particle outlet; 321. Screen hole; 331. Sliding component; 332. Sliding drive component; 331a. Connecting rod; 331b. Hinge seat; 41. Air-powered sorting assembly; 42. Recovery assembly. Detailed Implementation

[0011] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0012] This application provides a drying and screening device, referring to... Figure 1 and Figure 2The process flow for grain drying, screening, and impurity removal includes a feeding mechanism 1, a drying mechanism 2, a screening mechanism 3, an impurity removal and recovery mechanism 4, and a central control system. All these mechanisms are rationally arranged within the casing 6. The discharge end of the feeding mechanism 1 is connected to the inlet end of the drying cylinder 23 of the drying mechanism 2, ensuring that grains from the feeding mechanism 1 can smoothly enter the drying cylinder 23 for drying. The discharge end of the drying cylinder 23 of the drying mechanism 2 is connected to the inlet end of the air collection box 31 of the screening mechanism 3, allowing the dried grains to directly flow into the air collection box 31, preparing for subsequent screening. The air-powered sorting component 41 of the impurity removal and recovery mechanism 4 is located in the air collection box 31. When the screened fine grains flow out, the air-powered sorting component 41 promptly removes impurities. The central control system controls the operation of each mechanism. This layout allows for integrated processing from the moment the grains enter the equipment, sequentially undergoing feeding, drying, screening, and impurity removal and recovery. This improves processing efficiency, reduces manual intervention, and ensures smooth transitions between each stage. Specifically, the feeding mechanism 1 in this embodiment includes a feeding hopper and a feeding pipe. The feeding hopper is used to store grains to be processed. One end of the feeding pipe is inserted into the bottom of the feeding hopper, and the other end is sealed and connected to the inlet of the drying cylinder 23. The feeding pipe transports the grains from the feeding hopper to the inlet of the drying cylinder 23. The feeding pipe can be a screw conveyor, which transports the grains by rotating the screw blades. Its conveying speed can be adjusted according to the processing capacity of the drying mechanism 2. Specifically, the drying mechanism 2 in this embodiment includes a hot air assembly 21, a stirring assembly 22, and a drying cylinder 23. The hot air assembly 21 includes a hot air furnace and a ventilation duct. The hot air furnace generates hot air. One end of the ventilation duct is sealed and connected to the air outlet of the hot air furnace, and the other end extends into the drying cylinder 23 to provide heat for drying. The hot air furnace is a common gas-fired hot air furnace or an electric hot air furnace, which can generate high-temperature hot air and can adjust the temperature and air volume of the hot air as needed. The ventilation duct is made of metal, such as stainless steel, which has good high-temperature resistance and corrosion resistance, ensuring that the hot air can be stably delivered to the drying cylinder 23. The stirring assembly 22 is rotatably mounted inside the drying cylinder 23 to stir the grains, ensuring even heating. The stirring assembly 22 includes a grid plate 221 and connecting rods 222. The grid plate 221 is welded and fixed to the inner cylinder 232 at both ends via the connecting rods 222. The grid plate 221 has several gaps through which the grains can pass. The grid plate 221 can be made of metal, and the gap size is designed according to the grain size, allowing the grains to pass through smoothly while also providing a stirring function. The connecting rods 222 are made of metal to ensure their strength can support the rotation of the grid plate 221.The drying cylinder 23 includes an inclined, insulated outer cylinder 231 and an inner cylinder 232. The inner cylinder 232 is rotatably mounted inside the insulated outer cylinder 231 via a rotating shaft. A motor is located on one side of the insulated outer cylinder 231, and the motor's output shaft passes through the wall of the insulated outer cylinder 231 and is connected to the rotating shaft to provide driving force for the rotation. The inner cylinder 232 has several through holes in its wall, through which grains can fall onto the inner wall of the insulated outer cylinder 231. The insulated outer cylinder 231 is made of heat-insulating material, such as polyurethane foam, which can reduce heat loss and improve energy efficiency. The inner cylinder 232 can be made of stainless steel, which has good wear resistance and corrosion resistance. The insulated outer cylinder 231 is sealed and connected to the feeding pipe, which in turn is connected to the inner cylinder 232, to ensure smooth delivery of grain into the inner cylinder 232. The top of the insulated outer cylinder 231 is sealed and connected to the ventilation duct of the hot air assembly 21, and the bottom of the insulated outer cylinder 231 is sealed and connected to the air collection box 31 via a discharge pipe. The discharge pipe at the bottom of the insulated outer cylinder 231 is equipped with a switch valve 231a, which is controlled by the central control system to control the intermittent flow of grain to the air collection box 31. This ensures that the grain has sufficient time to dry in the drying cylinder 23, while also preventing a large amount of grain from flooding into the screening mechanism 3 at once, thus affecting the screening effect. The switch valve 231a is an electric valve, and the central control system controls the intermittent feeding of grain by controlling the time interval between its opening and closing.

[0013] Specifically, the stirring component 22 is welded to the inner cylinder 232 and can rotate synchronously with the inner cylinder 232. When the inner cylinder 232 rotates, it drives the stirring component 22 to rotate as well, thereby achieving stirring of the grains. This design allows the grains to continuously tumble between the inner cylinder 232 and the heat-insulating outer cylinder 231, increasing the contact area between the grains and the hot air and improving drying efficiency. In this embodiment, the heat-insulating outer cylinder 231 and the inner cylinder 232 are inclined downward toward the screening mechanism 3 at an angle of 15°. This angle ensures the smooth rotation of the inner cylinder 232 and facilitates the flow of grains on the heat-insulating outer cylinder 231 into the screening mechanism 3. In other embodiments, the inclination angle can be adjusted appropriately according to the size of the grain particles. Specifically, the screening mechanism 3 includes an air collecting box 31, a vibrating screen 32 with sieve holes 321, and a lifting component 33. The air collecting box 31 serves to collect hot air and screen grains, forming a relatively enclosed space inside, which is conducive to the screening work of the vibrating screen 32. The air collecting box 31 has a coarse particle outlet 311 on its side wall and a fine particle outlet 312 at the bottom of its side wall. The vibrating screen 32 is inclined, with one end rotatably mounted on one side wall of the air collecting box 31 via a hinged seat, and the other end extending through the coarse particle outlet 311 and slidably mounted on the coarse particle outlet 311 via a lifting assembly 33. This allows coarse grain particles to flow from one end of the screen plate to the coarse particle outlet 311, while fine grain particles fall through the screen holes 321 to the fine particle outlet 312. The size of the screen holes 321 of the vibrating screen 32 is designed according to the particle size classification requirements, effectively separating grains of different sizes. The lifting assembly 33 is used to lift one end of the screen plate, allowing the other end of the screen plate to rotate around an axis. Specifically, the air collection box 31 is connected to the heat-insulating outer cylinder 231 through the diversion pipe 5, so that a portion of the hot air is diverted from the drying cylinder 23 to the air collection box 31 for collection, thereby increasing the temperature inside the air collection box 31. The diameter of the diversion pipe 5 is small to limit the air volume of hot air delivered to the air collection box 31, ensuring that the secondary drying temperature of the air collection box 31 is much lower than the primary drying temperature of the drying cylinder 23. According to the volume of the equipment in this embodiment, the inner wall diameter of the diversion pipe 5 is designed to be 2cm.

[0014] Reference Figure 3The lifting component 33 can slide to abut against the sliding end of the vibrating screen 32 to push the vibrating screen 32 to slide and vibrate the grain out of the screen holes 321, preventing the grain from clogging the screen holes 321. The lifting component 33 includes a sliding member 331 and a sliding drive member 332, both disposed in the air collection box 31. The sliding member 331 is mainly composed of a connecting rod 331a and a hinge seat 331b. The sliding drive member 332 is a drive cylinder. The piston rod of the drive cylinder is hinged to one end of the connecting rod 331a. The bottom of the vibrating screen 32 is provided with a hinge seat 331b, and the other end of the connecting rod 331a is connected to the hinge seat 331b, so that the drive cylinder drives the connecting rod 331a to drive the vibrating screen 32 to rotate. In particular, the inner wall of the coarse particle discharge port 311 of the air collection box 31 is provided with a silicone anti-collision strip to avoid noise caused by impact when the vibrating screen 32 rotates. The vibrating screen 32 has several grooves and protrusions on its surface, forming an uneven surface. The size of the grooves and protrusions is much smaller than that of the grains. This uneven surface increases the rolling and bouncing on the screen surface, improving the screening effect and also helping to prevent the grains from sticking to the screen surface. Specifically, the impurity removal and recovery mechanism 4 in this embodiment includes a wind-driven sorting component 41 and a recovery component 42. The fine grain discharge port 312 of the air collecting box 31 is provided with a fine grain discharge pipe. The wind-driven sorting component 41 is located at the fine grain discharge pipe of the air collecting box 31 and is used to remove dust and light impurities. The wind-driven sorting component 41 includes a fan and a blowing pipe. One end of the blowing pipe is connected to the fine grain discharge pipe, and the fan is installed on the side of the blowing pipe. The wind force generated by the fan can separate dust and light impurities from the fine grains. The fan can be a centrifugal fan, and its wind force can be controlled by adjusting the fan speed. The recovery component 42 is installed on both sides of the fine grain discharge pipe, opposite to the air blowing pipe, to recover the blown dust and light impurities. The recovery component 42 is a bag filter dust collector. The inlet of the bag filter dust collector is connected to the outlet of the air duct, and the dust and impurities blown away by the wind are collected in the filter bag for subsequent processing and cleaning.

[0015] The implementation principle of this embodiment is as follows: First, the grain to be processed is stored in the feeding hopper of the feeding mechanism 1, and then conveyed to the drying cylinder 23 of the drying mechanism 2 by a screw conveyor. In the drying mechanism 2, the hot air generated by the hot air furnace of the hot air assembly 21 is sent into the drying cylinder 23 through the ventilation duct. At the same time, the stirring assembly 22 rotates synchronously with the rotatable inner cylinder 232 to stir the grain so that it is heated evenly. The heat-insulating outer cylinder 231 reduces heat loss. The central control system controls the electric switching valve 231a of the feeding pipe to realize the intermittent flow of grain to the screening mechanism 3. In the screening mechanism 3, the air collecting box 31 is provided with a coarse particle outlet 311 and a fine particle outlet 312. The vibrating screen 32 separates the coarse and fine grains. The air collecting box 31 collects hot air and is connected to the drying cylinder 23 through a diversion pipe. 5. The vibrating screen 32 is tilted. The driving cylinder in the lifting component 33 pushes the connecting rod 331a, thereby pushing the end of the vibrating screen 32 near the coarse particle discharge port 311 to slide to abut against the inner wall of the coarse particle discharge port 311 to prevent the screen holes 321 from being blocked. Finally, in the impurity removal and recovery mechanism 4, the fan of the wind separation component 41 generates wind power, which blows out the dust and light impurities of fine grains in the fine grain discharge pipe through the air blowing pipe. The dust is collected by the bag dust collector of the recovery component 42. This realizes the integrated processing of grains from entering to completing feeding, drying, screening and impurity removal and recovery in sequence. This not only improves the uniformity of grain drying, but also effectively prevents grains from easily sticking to the screen plate, thus preventing the screen holes 321 from being blocked, thereby improving the screening accuracy and processing efficiency.

[0016] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drying and screening apparatus, characterized in that, The system includes a drying mechanism (2) and a screening mechanism (3). The drying mechanism (2) includes a hot air assembly (21), a stirring assembly (22), and a drying cylinder (23). The outlet of the hot air assembly (21) is connected to the drying cylinder (23). The stirring assembly (22) is installed inside the drying cylinder (23) to stir the grains. The screening mechanism (3) includes an air collecting box (31), a vibrating screen (32) with sieve holes (321), and a lifting assembly (33). The drying cylinder (23) The discharge end is connected to the feed end of the air collection box (31). The air collection box (31) is provided with a fine particle discharge port (312) and a coarse particle discharge port (311). The vibrating screen (32) is inclined. One end of the vibrating screen (32) is rotatably set on the air collection box (31), and the other end is slidably set on the coarse particle discharge port (311) of the air collection box (31). The lifting component (33) pushes the vibrating screen (32) to slide to vibrate out the grain in the screen hole (321).

2. The drying and screening equipment according to claim 1, characterized in that, The drying cylinder (23) includes an insulated outer cylinder (231) and an inner cylinder (232). The inner cylinder (232) is rotatably disposed inside the insulated outer cylinder (231). The inner cylinder (232) is provided with several through holes, through which grains can fall to the inner wall of the insulated outer cylinder (231). The insulated outer cylinder (231) is connected to the hot air assembly (21) and the air collection box (31) respectively. A switch valve (231a) is provided between the insulated outer cylinder (231) and the air collection box (31) to control the grains to flow intermittently to the air collection box (31). The stirring assembly (22) is rotatably disposed between the inner cylinder (232) and the insulated outer cylinder (231). The stirring assembly (22) rotates synchronously with the inner cylinder (232).

3. The drying and screening equipment according to claim 2, characterized in that, The stirring assembly (22) includes a grid plate (221) and a connecting rod (222). The grid plate (221) is connected to the inner cylinder (232) at both ends through the connecting rod (222). The grid plate (221) is provided with a number of gaps through which grains can pass.

4. The drying and screening equipment according to claim 2, characterized in that, The heat-insulating outer cylinder (231) is connected to the air collection box (31) through a diversion pipe (5), and a portion of the hot air is diverted into the air collection box (31).

5. The drying and screening equipment according to claim 1, characterized in that, The lifting assembly (33) includes a sliding member (331) and a sliding drive member (332) both disposed in the air collection box (31). The vibrating screen (32) is connected to the sliding member (331). The sliding drive member (332) drives the sliding member (331) to move, thereby causing the vibrating screen (32) to rotate around the other end.

6. The drying and screening equipment according to claim 1, characterized in that, The surface of the vibrating screen (32) is provided with several grooves and protrusions to form an uneven surface.

7. The drying and screening equipment according to claim 1, characterized in that, It also includes a feeding mechanism (1), the discharge end of which is connected to the feed end of the drying cylinder (23).

8. The drying and screening equipment according to claim 1, characterized in that, It also includes a dust removal and recycling mechanism (4), which includes a wind-powered sorting component (41) and a recycling component (42). The wind-powered sorting component (41) is located at the fine particle outlet (312) of the air collection box (31) to remove dust and light impurities. The recycling component (42) is located at the wind-powered sorting component (41) to recycle dust and light impurities.

9. The drying and screening equipment according to claim 2, characterized in that, It also includes a central control system that controls the opening or closing of the switching valve (231a) and the operation of each mechanism.

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