A circulating type residue-free crop grain dryer and drying method

Abstract

The present invention relates to the technical field of grain drying, and more specifically, to a circulating type residue-free crop grain dryer and a drying method. It comprises a dryer body, an inverted truncated cone steel plate cylinder ventilation device is arranged inside the dryer body, a feeding and discharging device is installed on the surface of the dryer body, and the other end of the feeding and discharging device is located at the bottom of the dryer body, the lower end of the dryer body is supported by a frame, a heat source and an air inlet and exhaust device are arranged on the side of the dryer body away from the feeding and discharging device, and a control system is connected to the heat source and the air inlet and exhaust device. The present invention can assist the crop grains to turn over inside the silo by means of the inverted truncated cone steel plate cylinder ventilation device arranged in the silo, and absorb moisture when turning over, so as to achieve the effect of fully drying the crop grains.

Description

Technical Field

[0001] The invention relates to the technical field of grain drying, in particular to a circulating type residue-free crop grain dryer and a drying method. Background Art

[0002] Most of the existing crop grain drying equipment are technologies developed around the 1960s. Most of them use heated dry air as the drying medium. When the heated dry air passes through the crop grain layer, the hot dry air exchanges heat and mass with the moisture on the surface of the crop grains, thereby integrating the moisture on the surface of the grains into the dry air. In this process, due to the exchange of matter, the temperature of the hot dry air passing through the crop grain layer decreases and the relative humidity increases. Then the hot dry air with a dropped temperature and increased relative humidity is discharged into the dust collecting chamber by the main fan. The water that causes the relative humidity of the hot dry air to increase is the moisture integrated from the surface of the grains by the hot dry air. Therefore, the moisture of the crop grains decreases. This is the process of crop grain drying. After repeating this process many times, it is the hot air circulation crop grain dryer that is now widely used.

[0003] At that time, the control technology was not very developed. Considering the pressure loss of the crop seed layer to the flowing air, the drying part of the drying equipment was mostly designed as a very thin seed ventilation layer to minimize the resistance when the hot dry air passes through the seed ventilation layer. However, when the hot dry air passes through the seed ventilation layer, the contact time between the hot air and the seeds is very short. In a very short contact time, the heat and mass exchange cannot be fully carried out, resulting in low heat utilization and high energy consumption. In addition, due to the short contact time between the hot air and the seeds in the seed ventilation layer, the hot dry air has no time to integrate more moisture, and the relative humidity of the discharged air is not high. Therefore, this type of crop seed dryer has a complex structure and is easy to leave residues, low energy efficiency and high cost, low thermal energy utilization, and low drying efficiency. The drying speed is slow. For crop seeds, it is very important to avoid mixing with other varieties. When the variety is changed, it is time-consuming and laborious to clean the residual materials in the machine, which affects the production capacity. In view of this, we propose a circulating non-residue crop seed dryer and drying method. Summary of the invention

[0004] The object of the present invention is to provide a circulating type residue-free crop grain dryer and a drying method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, one of the purposes of the present invention is to provide a circulating type residue-free crop grain dryer, including a dryer body, an inverted truncated cone-shaped steel plate cylinder ventilation device is arranged inside the dryer body, a feed and discharge device is installed on the surface of the dryer body, and the other end of the feed and discharge device is located at the bottom of the dryer body, the lower end of the dryer body is supported by a frame, and a heat source and an air inlet and exhaust device are arranged on the side of the dryer body away from the feed and discharge device, and the heat source and the air inlet and exhaust device are internally connected with a control system.

[0006] As a further improvement of the present technical solution, the dryer body is of a cylindrical structure, and a silo and a hot air chamber are provided inside the dryer body, and the hot air chamber is located at the lower end of the silo. The silo is a sealed cylindrical steel plate silo, and a material lifting pipe discharge port, a dispersion plate and a material dividing cone are provided inside the silo. The material dividing cone is a conical steel plate cylinder with a lower opening, and the material dividing cone is installed at the upper end of the material lifting pipe body. A long strip material observation window and a sampling port are provided on the outer wall of the silo, and the inverted frustum-conical steel plate cylinder ventilation device is provided below the material dividing cone. The inverted frustum-conical steel plate cylinder ventilation device is composed of seven to nine inverted frustum-conical steel plate cylinder bodies, and an inspection window is provided on the lower end surface of the dryer body.

[0007] As a further improvement of the present technical solution, the feeding and discharging device is composed of a feeding hopper, a feeding plug plate, a feeding pipe, a lifting pipe body, a symmetrically arranged circulating plug plate body and a circulating plug plate cylinder, an inlet and outlet rotary cylinder, an adjustment sleeve, a butterfly bolt, a grain discharge port, a discharge plug plate body and a discharge plug plate cylinder. The feeding hopper is installed on the lower end outer wall of the silo, an inlet and outlet rotary cylinder is arranged in the middle of the dryer body, the inlet and outlet rotary cylinder and the feeding hopper are connected through a feeding pipe, a lifting pipe body is installed in the middle of the silo, a lifting auger is installed inside the lifting pipe body, the lower end of the lifting pipe body is located at the bottom of the inlet and outlet rotary cylinder, and a gap of fifty to one hundred millimeters is left between the lower end of the lifting pipe body and the bottom of the inner cavity of the inlet and outlet rotary cylinder, and an adjustment sleeve is sleeved on the outside of the inlet and outlet rotary cylinder, and the adjustment sleeve is lifted and lowered by a butterfly bolt to adjust the gap between the lifting pipe body and the inlet and outlet rotary cylinder.

[0008] As a further improvement of the technical solution, the frame is composed of three support columns, which are used to support the dryer body. The heights of the three support columns are adjusted by screws, and weight sensors are installed at the bottom of the three support columns. The weight sensors are used to sense the weight changes of the dry material.

[0009] As a further improvement of the present technical solution, the heat source and the air inlet and exhaust device are composed of a heat pump, an air inlet elbow, a damper flexible connection, a hot air door plate and a hot air door cylinder, a fan motor and a fan body, a fan flexible connection, an exhaust elbow, a dust bag, and a dust exhaust port. The heat pump is installed near the drying silo, the air inlet elbow is connected to the hot air chamber, and the hot air entering the hot air chamber is controlled by the hot air door plate and the hot air door cylinder. The fan motor and its fan body are installed on the top of the silo, the fan flexible connection is connected to the drying silo, and the exhaust elbow and the dust bag are located at the other end of the fan body.

[0010] As a further improvement of the present technical solution, the control system is used to control the power supply of the fan motor, heat pump, lifting auger, circulation plug cylinder, discharge plug cylinder, and hot air door cylinder, and at the same time set the opening and closing sequence according to the processes of feeding, drying, intermittent circulation, and discharge to achieve automatic operation. The control system includes a control box and a display screen. The display screen is used to display the operating status and operation control of each motor and cylinder, as well as the temperature and humidity in the drying barn, the material weight, and the converted moisture information of the dry material.

[0011] The second object of the present invention is to provide a method for operating a circulating type residue-free crop grain dryer as described in any one of the above to dry grains, comprising the following method steps:

[0012] S1. Feeding: According to the size of crop grains, loosen the butterfly bolt and adjust the height of the adjustment sleeve to adjust the gap between the lower end of the lifting auger and the bottom of the inlet and outlet rotating drum. After adjustment, tighten the butterfly bolt; manually open the feeding plug plate, and then press the feeding button. At this time, the symmetrically arranged circulation plug plate body is closed by the circulation plug plate cylinder, the hot air door plate is closed, the lifting auger and the fan body start to operate, and the material to be dried is put into the feeding hopper. The material enters the inlet and outlet rotating drum through the feeding pipe, and is lifted to the top of the drying silo by the lifting auger, and falls into the silo from the discharge port of the lifting pipe through the dispersion plate. The weight of the loaded material is recorded by the weight sensor and an alarm is issued when it is close to full. The amount of loaded material can also be checked through the material observation window;

[0013] S2. Turn on the heat pump, adjust the hot air temperature to a suitable temperature for drying crop grains, and press the drying button. At this time, the symmetrically arranged circulation plug body is opened by the circulation plug cylinder, the hot air door plate is opened, and the fan body starts to operate. The hot air enters the hot air chamber under the negative pressure suction of the top fan body, and then enters the material layer from the gap between the inverted truncated cone steel plate cylinder bodies. The hot air passes through the grains upward, is discharged from the fan body, and enters the dust bag to achieve grain drying;

[0014] S3, intermittent circulation, during the drying process, by adjusting the opening and closing time interval of the lifting auger motor, the intermittent circulation of the material during the drying process is realized to achieve the purpose of uniform drying;

[0015] S4, moisture monitoring, through the weight change of the material sensed by the weight sensor, automatically convert the moisture status of the dried material, and take samples from the sampling port, use the grain moisture meter to detect and verify the moisture content of the grain. When the dried material reaches the set moisture value, the heat pump stops running, and the fan body continues to be turned on to allow room temperature air to enter the drying silo to reduce the temperature of the dried material;

[0016] S5, discharging. After the temperature of the dry material drops to 8°C higher than the air temperature, the moisture content of the material is detected. When the target moisture content is reached, the discharging button is pressed, and the discharging plug cylinder opens the discharging plug body, and the material is discharged from the bottom of the feeding and discharging drum by its own gravity. When discharging, when the weight change rate is zero within a certain period of time, the discharging is completed and the discharging plug body is automatically closed. After the material is completely discharged, there is no material residue in the dry material bin, which can be verified by the weight sensed by the weight sensor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the circulating type residue-free crop grain dryer and drying method, a feeding and discharging device arranged at one end of the outer cylinder of the hot air chamber is used to assist the crop grains to be dried to enter the interior of the silo for drying and discharge;

[0019] 2. In the circulating type residue-free crop grain dryer and drying method, the inverted truncated cone steel plate cylinder ventilation device arranged in the silo can assist the crop grains to turn over inside the silo, absorb moisture during turning, and achieve the effect of fully drying the crop grains;

[0020] 3. In the circulating residue-free crop grain dryer and drying method, a weight sensor is used at the bottom of the frame, and the weight sensor adopts a weight method to calculate the moisture content, so that the use of the weight sensor is not limited by the material category, thereby improving the use effect of the weight sensor. Among them, the weight sensor not only calculates the moisture content, but also serves as a means of judging whether the material in the silo is completely discharged, thereby effectively improving the overall use effect of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall cutaway structure of the present invention;

[0022] Figure 2 It is a front view of the overall structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the half-section structure of the dryer body of the present invention.

[0024] The meaning of each number in the figure is:

[0025] 1. Dryer body; 11. Material bin; 12. Material discharging port of lifting pipe; 13. Dispersing plate; 14. Material distributing cone; 15. Material lifting auger; 16. Observation window; 17. Sampling port;

[0026] 2. Inverted truncated cone steel plate cylinder ventilation device; 21. Inverted truncated cone steel plate cylinder body; 22. Hot air chamber; 23. Inspection window;

[0027] 3. Feeding and discharging device; 31. Feeding hopper; 32. Feeding plug plate; 33. Feeding pipe; 34. Lifting pipe body; 35. Circulating plug plate body; 36. Circulating plug plate cylinder; 37. Feeding and discharging rotating cylinder; 38. Adjusting sleeve; 39. Butterfly bolt; 310. Grain discharging port; 311. Discharging plug plate body; 312. Discharging plug plate cylinder;

[0028] 4. Frame; 41. Support column; 42. Screw; 43. Weight sensor;

[0029] 5. Heat source and air inlet and exhaust device; 51. Heat pump; 52. Air inlet elbow; 53. Air door flexible connection; 54. Hot air door plate; 55. Hot air door cylinder; 56. Fan motor; 57. Fan body; 58. Fan flexible connection; 59. Exhaust elbow; 510. Dust bag; 511. Dust outlet;

[0030] 6. Control system; 61. Control box; 62. Display screen. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0032] See also Figure 1-Figure 3 As shown, the purpose of this embodiment is to provide a circulating type residue-free crop grain dryer, including a dryer body 1, an inverted truncated cone-shaped steel plate cylinder ventilation device 2 is arranged inside the dryer body 1, a feeding and discharging device 3 is installed on the surface of the dryer body 1, and the other end of the feeding and discharging device 3 is located at the bottom of the dryer body 1, the lower end of the dryer body 1 is supported by a frame 4, and a heat source and an air inlet and exhaust device 5 are arranged on the side of the dryer body 1 away from the feeding and discharging device 3, and the heat source and the air inlet and exhaust device 5 are internally connected with a control system 6.

[0033] The dryer body 1 is a cylindrical structure, and a silo 11 and a hot air chamber 22 are provided inside the dryer body 1. The hot air chamber 22 is located at the lower end of the silo 11. The silo 11 is a sealed cylindrical steel plate silo. A material discharging port 12, a dispersion plate 13 and a material distribution cone 14 are provided inside the silo 11. The material distribution cone 14 is a conical steel plate cylinder with a lower opening. The material distribution cone 14 is installed at the upper end of the material discharging pipe body 34. A long strip material observation window 16 and a sampling port 17 are provided on the outer wall of the silo 11. An inverted truncated cone steel plate cylinder ventilation device 2 is provided below the material distribution cone 14. The inverted truncated cone steel plate cylinder ventilation device 2 is composed of seven to nine inverted truncated cone steel plate cylinder bodies 21. An inspection window 23 is provided on the lower end surface of the dryer body 1.

[0034] From bottom to top, the inverted truncated cone shaped steel plate cylinder body 21 is connected to each other from small to large, and the lower edge of the upper inverted truncated cone shaped steel plate cylinder body 21 is inserted into the lower inverted truncated cone shaped steel plate cylinder body 21 by twenty to thirty millimeters. A gap of twenty to thirty millimeters is left at the connection between two adjacent inverted truncated cone shaped steel plate cylinder bodies 21, which is the entrance for hot air to enter the material layer. The overall cone angle of the inverted truncated cone shaped steel plate cylinder ventilation device 2 is 48-55 degrees.

[0035] The feeding and discharging device 3 is composed of a feeding hopper 31, a feeding plug plate 32, a feeding pipe 33, a lifting pipe body 34, a symmetrically arranged circulating plug plate body 35 and a circulating plug plate cylinder 36, an inlet and outlet rotating cylinder 37, an adjustment sleeve 38, a butterfly bolt 39, a grain outlet 310, a discharging plug plate body 311 and a discharging plug plate cylinder 312. The feeding hopper 31 is installed on the lower end outer wall of the silo 11, and an inlet and outlet rotating cylinder 37 is arranged in the middle of the dryer body 1. The feeding pipe is connected between the inlet and outlet rotating cylinder 37 and the feeding hopper 31. 33 is connected, a lifting pipe body 34 is installed in the middle of the silo 11, a lifting auger 15 is installed inside the lifting pipe body 34, the lower end of the lifting pipe body 34 is located at the bottom of the inlet and outlet rotary cylinder 37, and a gap of fifty to one hundred millimeters is left between the lower end of the lifting pipe body 34 and the bottom of the inner cavity of the inlet and outlet rotary cylinder 37, an adjusting sleeve 38 is sleeved on the outside of the inlet and outlet rotary cylinder 37, and the adjusting sleeve 38 is raised and lowered by a butterfly bolt 39, so as to adjust the gap between the lifting pipe body 34 and the inlet and outlet rotary cylinder 37.

[0036] The frame 4 is composed of three support columns 41, which are used to support the dryer body 1. The heights of the three support columns 41 are adjusted by screws 42. Weight sensors 43 are installed at the bottom of the three support columns 41. The weight sensors 43 are used to sense the weight changes of the dry material.

[0037] The heat source and air inlet and exhaust device 5 consists of a heat pump 51, an air inlet elbow 52, ​​a damper flexible connection 53, a hot air door plate 54 and a hot air door cylinder 55, a fan motor 56 and a fan body 57, a fan flexible connection 58, an exhaust elbow 59, a dust bag 510, and a dust exhaust port 511. The heat pump 51 is installed near the drying silo 11, the air inlet elbow 52 is connected to the hot air chamber 22, and the hot air is controlled to enter the hot air chamber 22 through the hot air door plate 54 and the hot air door cylinder 55. The fan motor 56 and its fan body 57 are installed on the top of the silo 11, the fan flexible connection 58 is connected to the drying silo 11, and the exhaust elbow 59 and the dust bag 510 are located at the other end of the fan body 57.

[0038] The control system 6 is used to control the power supply of the fan motor 56, the heat pump 51, the lifting auger 15, the circulation plug cylinder 36, the discharge plug cylinder 312, and the hot air door cylinder 55, and at the same time set the opening and closing sequence according to the processes such as feeding, drying, intermittent circulation, and discharging to realize automatic operation. The control system 6 includes a control box 61 and a display screen 62. The display screen 62 is used to display the operating status and operation control of each motor and cylinder, as well as the temperature and humidity in the drying barn, the material weight and the converted moisture information of the dry material.

[0039] When the feed button is pressed, the weight sensor 43 below the frame 4 returns to the zero state of the whole machine weight. When the weight of the feed reaches the rated weight, the control box 61 sounds an alarm to indicate that the silo 11 is full and the feed is stopped.

[0040] When the material enters the interior of the silo 11, the circulation plug body 35 is opened, and the fan body 57 and the material lifting auger 15 are started by the motor, and the heat pump 51 is started at the same time, the hot air door cylinder 55 automatically opens the hot air door plate 54, and the circulation plug cylinder 36 automatically opens the circulation plug body 35, and the material falls freely to the lower end of the inverted truncated cone steel plate cylinder body 21. Through the operation of the fan body 57, negative pressure is formed in the silo 11. The material lifting auger 15 rotates inside the material lifting pipe body 34, so that the material can be lifted from the lowermost part of the inverted truncated cone steel plate cylinder body 21 to the material lifting pipe outlet 12, so that the material can be thrown into the interior of the silo 11, realizing the material circulation drying operation;

[0041] Among them, the circulation volume during the circulation drying operation is controlled by the time ratio of the starting motor of the material lifting auger 15 to run or stop, which can be manually set. This is the prior art and will not be described in detail here;

[0042] Before the material moisture is three percentage points higher than the target drying moisture, the relatively accurate original moisture value can be corrected to make the target drying moisture more accurate.

[0043] Low-temperature drying is particularly important for crop seeds. The hot air blown out by the heat pump 51 is humidified and then heated, so that a faster drying speed can be achieved at a lower hot air temperature.

[0044] During the discharging operation, the weight sensor 43 stops calculating the moisture content and keeps the displayed value when the drying operation stops automatically. The weight sensor 43 is a means of judging whether the silo 11 is completely drained. When the weight sensor 43 measures the weight change rate to be zero for three consecutive minutes, it is judged that the material has been emptied. The displayed target drying moisture value is kept until the feed operation button is operated, and the discharging plug cylinder 312 automatically closes the discharging plug body 311.

[0045] Since the interior of the silo 11 generates negative pressure through the start-up of the fan body 57 to drive the material to move, and some impurities will remain on the surface of the material, in order to discharge the impurities and moisture on the surface of the material, the air outlet of the fan body 57 is connected to an exhaust elbow 59, and the other end of the exhaust elbow 59 is connected to a dust bag 510. The lower end of the dust bag 510 is provided with a dust discharge port 511. When the material is dried, the moisture of the material is integrated into the hot air, and the hot air enters the dust bag 510 along the exhaust elbow 59. The dust bag 510 can pass through the air with high relative humidity, and the dust in the hot air is filtered in the dust bag 510, and can then be discharged uniformly through the dust discharge port 511.

[0046] The observation window 16 provided on the surface of the dryer body 1 can be used to observe the drying process of the material, and the sampling port 17 provided in the middle of the dryer body 1 can be used to sample and check the drying effect of the material, thereby improving the drying effect of the material. The inspection window 23 provided on the lower end surface of the dryer body 1 can be used to inspect the components at the lower end of the silo 11 without disassembling the dryer body 1 as a whole. Example 2

[0047] This embodiment is based on the content provided in Embodiment 1, and aims to provide a drying method of a circulating type residue-free crop grain dryer, and the specific steps are as follows:

[0048] S1. Feeding: according to the size of crop grains, loosen the butterfly bolt 39 and adjust the height of the adjustment sleeve 38 to adjust the gap between the lower end of the lifting auger 15 and the bottom of the inlet and outlet rotating cylinder 37. After adjustment, tighten the butterfly bolt 39; manually open the feeding plug plate 32, and then press the feeding button. At this time, the symmetrically arranged circulation plug plate body 35 is closed by the circulation plug plate cylinder 36, the hot air door plate 54 is closed, the lifting auger 15 and the fan body 57 start to operate, and the material to be dried is put into the feeding hopper 31. The material enters the inlet and outlet rotating cylinder 37 through the feeding pipe 33, and is lifted to the top of the drying silo 11 by the lifting auger 15, and falls into the silo 11 from the feeding port 12 of the lifting pipe through the dispersion plate 13. The weight of the loaded material is recorded by the weight sensor 43 and an alarm is issued when it is close to full. The amount of loaded material can also be checked through the material observation window 16;

[0049] S2, turn on the heat pump 51, adjust the hot air temperature to a suitable temperature for drying crop grains, press the drying button, at this time, the symmetrically arranged circulation plug body 35 is opened by the circulation plug cylinder 36, the hot air door plate 54 is opened, and the fan body 57 starts to operate. The hot air enters the hot air chamber 22 under the negative pressure suction of the top fan body 57, and then enters the material layer from the gap between the inverted truncated cone steel plate cylinder body 21. The hot air passes through the grain upwards, is discharged by the fan body 57, and enters the dust bag 510 to achieve grain drying;

[0050] S3, intermittent circulation, during the drying process, by adjusting the opening and closing time interval of the material lifting auger 15 motor, the intermittent circulation of the material during the drying process is realized to achieve the purpose of uniform drying;

[0051] S4, moisture monitoring, the moisture status of the dried material is automatically calculated through the weight change of the material sensed by the weight sensor 43, and samples are taken from the sampling port 17, and the grain moisture is tested and verified using a grain moisture meter. When the dried material reaches the set moisture value, the heat pump 51 stops running, and the fan body 57 continues to be turned on to allow room temperature air to enter the drying silo 11 to reduce the temperature of the dried material;

[0052] S5, discharging. After the temperature of the dry material drops to 8°C higher than the air temperature, the moisture content of the material is detected. When the target moisture content is reached, the discharging button is pressed, and the discharging plug cylinder 312 opens the discharging plug body 311, and the material is discharged from the bottom of the inlet and outlet rotating drum 37 by the material's own gravity. When discharging, when the weight change rate is zero within a certain period of time, the discharging is completed, and the discharging plug body 311 is automatically closed. After the material is completely discharged, there is no material residue in the dry material bin 11, which can be verified by the weight sensed by the weight sensor 43.

[0053] The above shows and describes 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 by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A circulating type residue-free crop grain dryer, comprising a dryer body (1), characterized in that: An inverted truncated cone-shaped steel plate cylinder ventilation device (2) is arranged inside the dryer body (1); a feeding and discharging device (3) is installed on the surface of the dryer body (1), and the other end of the feeding and discharging device (3) is located at the bottom of the dryer body (1); the lower end of the dryer body (1) is supported by a frame (4); a heat source and an air inlet and exhaust device (5) are arranged on a side of the dryer body (1) away from the feeding and discharging device (3); and a control system (6) is connected to the inside of the heat source and the air inlet and exhaust device (5); The dryer body (1) is of a cylindrical structure, and a silo (11) and a hot air chamber (22) are provided inside the dryer body (1), and the hot air chamber (22) is located at the lower end of the silo (11). The silo (11) is a sealed cylindrical steel plate silo, and a material lifting pipe discharge port (12), a dispersion plate (13) and a material distribution cone (14) are provided inside the silo (11); The frame (4) is composed of three support columns (41), and weight sensors (43) are installed at the bottom of the three support columns (41), and the weight sensors (43) are used to sense the weight change of the dry material; The material distribution cone (14) is a conical steel plate cylinder with an opening at the bottom. The material distribution cone (14) is installed at the upper end of the material lifting pipe body (34). The outer wall of the material bin (11) is provided with a long strip material observation window (16) and a sampling port (17). The inverted truncated cone steel plate cylinder ventilation device (2) is arranged below the material distribution cone (14). The inverted truncated cone steel plate cylinder ventilation device (2) is composed of seven to nine inverted truncated cone steel plate cylinder bodies (21). The lower end surface of the dryer body (1) is provided with an inspection window (23); The feeding and discharging device (3) is composed of a feeding hopper (31), a feeding plug plate (32), a feeding pipe (33), a lifting pipe body (34), a symmetrically arranged circulating plug plate body (35) and a circulating plug plate cylinder (36), an inlet and outlet rotating cylinder (37), an adjustment sleeve (38), a butterfly bolt (39), a grain outlet (310), a discharging plug plate body (311) and a discharging plug plate cylinder (312). The feeding hopper (31) is installed on the lower outer wall of the silo (11). The middle part of the dryer body (1) is provided with an inlet and outlet rotating cylinder (37). The inlet and outlet rotating cylinder (37) and the feeding hopper (31) are connected by a A feeding pipe (33) is connected to the silo (11), a lifting pipe body (34) is installed in the middle of the silo (11), a lifting auger (15) is installed inside the lifting pipe body (34), the lower end of the lifting pipe body (34) is located at the bottom of the inlet and outlet rotating cylinder (37), and a gap of fifty to one hundred millimeters is left between the lower end of the lifting pipe body (34) and the bottom of the inner cavity of the inlet and outlet rotating cylinder (37), and an adjustment sleeve (38) is sleeved on the outside of the inlet and outlet rotating cylinder (37), and the adjustment sleeve (38) is raised and lowered by a butterfly bolt (39), so as to adjust the gap between the lifting pipe body (34) and the inlet and outlet rotating cylinder (37).

2. The circulating type residue-free crop grain dryer according to claim 1, characterized in that: The three support columns (41) are used to support the dryer body (1), and the heights of the three support columns (41) are all adjusted by means of a screw rod (42).

3. The circulating type residue-free crop grain dryer according to claim 1, characterized in that: The heat source and air intake and exhaust device (5) are composed of a heat pump (51), an air intake bend (52), an air door flexible connection (53), a hot air door plate (54) and a hot air door cylinder (55), a fan motor (56) and a fan body (57), a fan flexible connection (58), an exhaust elbow (59), a dust collecting bag (510), and a dust exhaust port (511). The heat pump (51) is installed near the drying silo (11). The air intake bend (52) is connected to the hot air chamber (22). The hot air is controlled to enter the hot air chamber (22) through the hot air door plate (54) and the hot air door cylinder (55). The fan motor (56) and the fan body (57) are installed on the top of the silo (11). The fan flexible connection (58) is connected to the drying silo (11). The exhaust elbow (59) and the dust collecting bag (510) are located at the other end of the fan body (57).

4. The circulating type residue-free crop grain dryer according to claim 3, characterized in that: The control system (6) is used to control the power supply of the fan motor (56), the heat pump (51), the lifting auger (15), the circulation plug plate cylinder (36), the discharge plug plate cylinder (312), and the hot air door cylinder (55). The control system (6) includes a control box (61) and a display screen (62). The display screen (62) is used to display the operating status and operation control of each motor and cylinder, as well as the temperature and humidity in the drying barn, the material weight and the converted moisture information of the drying material.

5. A drying method using the circulating type residue-free crop grain dryer as claimed in claim 3, characterized in that: The steps include: S1. Feeding: according to the size of the crop grains, loosen the butterfly bolt (39) and adjust the height of the adjustment sleeve (38) to adjust the gap between the lower end of the lifting auger (15) and the bottom of the feeding and discharging rotating cylinder (37). After adjustment, tighten the butterfly bolt (39); manually open the feeding plug plate (32), and then press the feeding button. At this time, the symmetrically arranged circulation plug plate body (35) is closed by the circulation plug plate cylinder (36), the hot air door plate (54) is closed, and the lifting auger (15) and The fan body (57) starts to operate, and the material to be dried is put into the feed hopper (31). The material enters the feed and discharge rotating drum (37) through the feed pipe (33), is lifted to the top of the silo (11) by the material lifting auger (15), and falls into the silo (11) from the discharge port (12) of the material lifting pipe through the dispersion plate (13). The weight of the loaded material is recorded by the weight sensor (43) and an alarm is issued when it is close to full. The amount of loaded material can also be checked through the material observation window (16); S2, turning on the heat pump (51), adjusting the hot air temperature to a suitable temperature for drying crop grains, pressing the drying button, at which time, the symmetrically arranged circulation plug body (35) is opened by the circulation plug cylinder (36), the hot air door plate (54) is opened, and the fan body (57) starts to operate. The hot air enters the hot air chamber (22) under the negative pressure suction of the top fan body (57), and then enters the material layer from the gap between the inverted truncated cone-shaped steel plate cylinder body (21). The hot air passes through the grains upwards, is discharged from the fan body (57), and enters the dust collecting bag (510), thereby achieving the drying of the grains; S3, intermittent circulation, during the drying process, by adjusting the opening and closing time interval of the material lifting auger (15) motor, the intermittent circulation of the material during the drying process is realized to achieve the purpose of uniform drying; S4, moisture monitoring, the moisture status of the dried material is automatically calculated through the weight change of the material sensed by the weight sensor (43), and a sample is taken from the sampling port (17), and the moisture of the grain is tested and verified using a grain moisture meter. When the dried material reaches the set moisture value, the heat pump (51) stops running, and the fan body (57) continues to be turned on to allow room temperature air to enter the drying bin (11) to reduce the temperature of the dried material; S5, discharging. After the temperature of the dried material drops to 8°C higher than the air temperature, the moisture content of the material is detected. When the target moisture content is reached, the discharging button is pressed, and the discharging plug cylinder (312) opens the discharging plug body (311), and the material is discharged from the bottom of the feeding and discharging rotating drum (37) by the material's own gravity. When the weight change rate is zero within a certain period of time during discharging, the discharging is completed, and the discharging plug body (311) is automatically closed. After the material is completely discharged, there is no material residue in the silo (11), which can be verified by the weight sensed by the weight sensor (43).

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