Full-automatic pelleting coating device and coating method for small-particle forage grass seeds

Abstract

The invention discloses a full-automatic pelletization coating system and method for small forage grass seeds, and particularly relates to the technical field of agricultural equipment.The full-automatic pelletization coating system comprises a rack, a controller, a pelletization coating device, a seed supply device, a powder supply device and a liquid supply device, and the pelletization coating device, the seed supply device, the powder supply device and the liquid supply device are in signal connection with the controller; both the seed supply device and the powder supply device are provided with vibration exciters capable of providing two vibration amplitudes, so that two blanking speeds, namely a fast blanking speed and a slow blanking speed, are realized, errors caused by materials in the air when a weighing hopper detects preset supply mass are reduced, and accurate supply of seeds and powder is achieved; the liquid supply device comprises a liquid medicine box, a clear water box, a proportional control three-way valve and a peristaltic pump, the liquid medicine box and the clear water box are connected with the peristaltic pump through the proportional control three-way valve, and the liquid medicine proportion can be accurately controlled by adjusting the opening degree of the proportional control three-way valve. According to the invention, the coating uniformity of small pasture seeds can be improved, the pelleting quality is enhanced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural equipment, and in particular to a fully automatic pelletizing and coating device and a coating method for small-grain forage seeds. Background Art

[0002] Existing seed coating machines are mainly used for vegetable seeds, crops, flower seeds, etc. with regular shapes and large particle sizes. However, small-grain forage seeds have small particle sizes and irregular shapes. Therefore, when using existing seed coating machines to coat small-grain forage seeds, there are problems such as low coating quality and low pelleting qualification rate. Summary of the invention

[0003] The purpose of the present invention is to provide a fully automatic pelletizing and coating device and coating method for small-grain forage seeds, so as to solve the problems existing in the above-mentioned prior art, improve the coating uniformity of small-grain forage seeds, enhance the pelletizing quality, and improve production efficiency.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a fully automatic pelletizing and coating system for small-grain forage seeds, comprising: a frame; a pelletizing and coating device; the pelletizing and coating device is fixed on the frame, comprising a driving device and a coating pot, and the driving device is connected to the rotating shaft of the coating pot; a seed supply device; the seed supply device is fixed on the frame, the seed supply device comprises a seed box, a first vibrator and a first weighing hopper, the first vibrator has two vibration amplitudes, the first vibrator is fixedly connected to the seed box, the first weighing hopper is located below the seed box, and the first weighing hopper is connected to the coating pot through a seed conveying pipeline; a powder supply device; the powder supply device is fixed on the frame, the powder supply device comprises a powder box, a second vibrator and a second weighing hopper, the second vibrator has two vibration amplitudes, the second vibrator is fixedly connected to the powder box, the second weighing hopper is located below the powder box, and the second weighing hopper is connected to the coating pan through a powder conveying pipeline; a liquid supply device; the liquid supply device is fixed on the frame, and the liquid supply device comprises a liquid medicine tank, a clean water tank, a proportional control three-way valve and a peristaltic pump, the liquid medicine tank and the clean water tank are connected to the peristaltic pump through the proportional control three-way valve, and the peristaltic pump is connected to the coating pan through a liquid supply pipe; a controller; the driving device, the first vibrator, the first weighing hopper, the second vibrator, the second weighing hopper, the proportional control three-way valve and the peristaltic pump are all connected to the controller signal.

[0006] Preferably, the seed box includes a seed storage box and a seed trough, the first vibrator includes a first electromagnetic exciter and a first buffer assembly, the seed trough is located below the seed storage box, the mover of the first electromagnetic exciter is fixedly connected to the outer bottom surface of the seed trough, the shell of the first electromagnetic exciter is fixedly connected to the first buffer assembly, the first buffer assembly includes a first top plate, a first elastic support member and a first base, and the first top plate is fixedly connected to the first base via the first elastic support member.

[0007] Preferably, the first weighing hopper includes a first hopper box, a first blanking plate, a first weighing sensor, a first electric servo and a connecting rod, the first hopper box having a first feed port and a first discharge port, the first blanking plate is rotatably connected to the first hopper box for opening and closing the first discharge port, the first electric servo is fixedly connected to the first hopper box, the output shaft of the first electric servo is fixedly connected to one end of the connecting rod, the other end of the connecting rod is fixedly connected to the first blanking plate, the first weighing sensor is fixedly connected to the first hopper box, and the first weighing sensor and the first electric servo are both connected to the controller signal.

[0008] Preferably, the powder box includes a powder storage box and a powder trough, the second exciter includes a second electromagnetic exciter and a second buffer assembly, the powder trough is located below the powder storage box, the mover of the second electromagnetic exciter is fixedly connected to the outer bottom surface of the powder trough, the shell of the second electromagnetic exciter is fixedly connected to the second buffer assembly, the second buffer assembly includes a second top plate, a second elastic support member and a second base, and the second top plate is fixedly connected to the second base through the second elastic support member.

[0009] Preferably, the second weighing hopper includes a second hopper box, a second blanking plate, a second weighing sensor and a second electric servo, the second hopper box has a second feed port and a second discharge port, the second blanking plate is rotatably connected to the second hopper box for opening and closing the second discharge port, the second electric servo is fixedly connected to the second hopper box, the output shaft of the second electric servo is fixedly connected to the second blanking plate, the second weighing sensor is fixedly connected to the second hopper box, and the second weighing sensor and the second electric servo are both connected to the controller signal.

[0010] Preferably, the medicine liquid tank is connected to the proportional control three-way valve through a medicine liquid pipe, and the clean water tank is connected to the proportional control three-way valve through a clean water pipe. A medicine liquid flow meter is provided on the medicine liquid pipe, and a clean water flow meter is provided on the clean water pipe. Both the medicine liquid flow meter and the clean water flow meter are connected to the controller signal.

[0011] Preferably, the controller adjusts the opening of the proportional control three-way valve by a proportional-integral regulation method.

[0012] Preferably, the liquid supply pipe is provided with a solenoid valve for starting or stopping the liquid supply, and the solenoid valve is connected to the controller signal.

[0013] Preferably, the driving device includes a three-phase AC motor and a frequency converter, a speed sensor is installed on the rotating shaft of the three-phase AC motor, the speed sensor is connected to the controller signal, the controller changes the speed of the three-phase AC motor by adjusting the voltage across the frequency converter through a PWM signal, and measures the speed of the three-phase AC motor in real time through the speed sensor.

[0014] The present invention also provides a coating method using the small-grain forage grass seed fully automatic pelletizing coating system, comprising the following steps:

[0015] Step 1, setting the seed dropping mass, pelleting times, single powder dropping mass, single liquid supply, pelleting coating device speed and single idling time through the controller;

[0016] Step 2, after the setting is completed, the controller controls the first vibrator to vibrate the seed box at a high gear to make the seeds fall, and monitors the weight of the seeds in the first weighing hopper in real time through the signal fed back by the first weighing hopper. When the difference is 20g and the seed falling mass is not reached, the controller controls the first vibrator to adjust to a low gear. When the seed falling mass is reached, the controller controls the first vibrator to stop vibrating, and controls the first weighing hopper to transport a certain amount of seeds to the coating pot.

[0017] Step three, the controller controls the second vibrator to vibrate the powder box at a high gear to make the powder fall, and monitors the weight of the powder in the second weighing hopper in real time through the signal fed back by the second weighing hopper. When the difference is 10g and the powder falling mass is not reached, the controller controls the second vibrator to adjust to a low gear. When the powder falling mass is reached, the controller controls the second vibrator to stop vibrating, and controls the second weighing hopper to transport a certain amount of powder to the coating pan.

[0018] Step 4: After the seed supply and the single powder supply are completed, the controller controls the pelletizing and coating device to rotate at a preset speed;

[0019] Step 5, after the pelleting coating device runs until the seeds and powder are fully mixed, the controller controls the liquid supply device to adjust the opening of the proportional control three-way valve in a proportional-integral regulation mode, thereby controlling the liquid-drug ratio, and the controller controls the peristaltic pump to open and deliver the mixed liquid to the coating pot. When the single liquid supply volume is reached, the controller controls the peristaltic pump to close;

[0020] Step 6: After the liquid supply is completed, the pelletizing and coating device performs seed pelleting once according to the set single idle time;

[0021] Step 7: After a single seed pelleting, repeat steps 3 to 6 according to the number of pelleting times set by the controller. When the preset number of pelleting times is reached and the last seed pelleting is completed, the controller controls the coating pan to idle for 20 seconds. After the idling is completed, the pelleting coating is completed.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The present invention provides a fully automatic pelletizing coating system and coating method for small-grain forage grass seeds. In a seed supply device and a powder supply device, the material quality can be fed back in real time through a weighing hopper, and a phase-shift triggering method is adopted to set the vibration amplitude of two gears for the exciter, thereby reducing the error caused by the material in mid-air when the weighing hopper detects the preset feeding quality, and realizing the precise supply of seeds and powder. At the same time, the controller can control the opening of the three-way valve to adjust the ratio, so as to accurately control the liquid-drug ratio. By optimizing the ratio of the seed supply amount, the powder supply amount and the liquid supply amount, the coating uniformity and the pelletizing quality are significantly improved, and the production efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is the structural diagram of the fully automatic pelletizing and coating system for small-grain forage seeds;

[0026] Figure 2 This is a schematic diagram of the structure of a fully automatic pelletizing and coating system for small-grain forage seeds;

[0027] Figure 3 This is a schematic diagram of the control system of the fully automatic pelletizing and coating system for small-grain forage seeds;

[0028] Figure 4 It is a structural schematic diagram of a seed supply device;

[0029] Figure 5 It is a structural schematic diagram of the powder feeding device.

[0030] In the figure: 1. Seed supply device; 2. Pellet coating device; 3. Three-phase AC motor; 4. Frame; 5. Liquid supply pipe; 6. Powder supply device; 7. Touch screen; 8. Peristaltic pump; 9. Liquid supply device; 10. Seed storage box; 11. Seed trough; 12. First electromagnetic exciter; 13. First hopper box; 14. First electric servo; 15. First weighing sensor; 16. Powder storage box; 17. Powder trough; 18. Second electromagnetic exciter; 19. Second hopper box; 20. Second electric servo; 21. Two weighing sensors; 22. Speed ​​sensor; 23. Central processing unit; 24. Clean water flow meter; 25. Liquid medicine flow meter; 26. Proportional control three-way valve; 27. Solenoid valve; 28. Clean water tank; 29. ​​Liquid medicine tank; 30. Coating pot; 31. Frequency converter; 32. First top plate; 33. First elastic support member; 34. First base; 35. First blanking plate; 36. Connecting rod; 37. Second top plate; 38. Second elastic support member; 39. Second base; 40. Second blanking plate; 41. Rotating shaft. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of 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.

[0032] The purpose of the present invention is to provide a fully automatic pelletizing and coating device and coating method for small-grain forage seeds, so as to solve the problems existing in the above-mentioned prior art, improve the coating uniformity of small-grain forage seeds, enhance the pelletizing quality, and improve production efficiency.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] This embodiment provides a fully automatic pelleting and coating system for small-grain forage seeds. Figure 1-3As shown, it includes a frame 4, a pelletizing coating device 2, a seed supply device 1, a powder supply device 6, a liquid supply device 9 and a controller. The pelletizing coating device 2 is installed at the center of the frame 4, the seed supply device 1 and the powder supply device 6 are respectively located on both sides above the pelletizing coating device 2, the liquid supply device 9 is located below the pelletizing coating device 2, and the controller is embedded in the frame 4; the pelletizing coating device 2 is fixed on the frame 4, and includes a driving device and a coating pot 30, and the driving device is connected to the rotating shaft 41 of the coating pot 30; the seed supply device 1 is fixed on the frame 4, and the seed supply device 1 includes a seed box, a first vibrator and a first weighing hopper, the first vibrator has two vibration amplitudes, the first vibrator is fixedly connected to the seed box, the first weighing hopper is located below the seed box, and the first weighing hopper is connected to the seed transport pipeline connected to the coating pot 30; the powder supply device 6 is fixed on the frame 4, the powder supply device 6 includes a powder box, a second vibrator and a second weighing hopper, the second vibrator has two vibration amplitudes, the second vibrator is fixedly connected to the powder box, the second weighing hopper is located below the powder box, and the second weighing hopper is connected to the coating pot 30 through a powder conveying pipeline; the liquid supply device 9 is fixed on the frame 4, the liquid supply device 9 includes a liquid medicine tank 29, a clean water tank 28, a proportional control three-way valve 26 and a peristaltic pump 8, the liquid medicine tank 29 and the clean water tank 28 are connected to the peristaltic pump 8 through the proportional control three-way valve 26, and the peristaltic pump 8 is connected to the coating pot 30 through the liquid supply pipe 5; the driving device, the first vibrator, the first weighing hopper, the second vibrator, the second weighing hopper, the proportional control three-way valve 26 and the peristaltic pump 8 are all connected to the controller signal. In the seed supply device 1 and the powder supply device 6, the material quality can be fed back in real time through the weighing hopper, and the vibration amplitude of two gears is set for the exciter by using the phase-shift trigger method, thereby reducing the error caused by the material in mid-air when the weighing hopper detects the preset feeding quality, and realizing the precise supply of seeds and powders; at the same time, the controller can control the opening of the proportional control three-way valve 26, so as to accurately control the ratio of medicine to liquid; by optimizing the ratio of seed supply, powder supply and liquid supply, the uniformity of coating and pelletization quality are significantly improved, and the production efficiency is greatly improved.

[0036] In the implementation of this embodiment, it is further preferred that Figure 4As shown, the seed box includes a seed storage box 10 and a seed trough 11, the first exciter includes a first electromagnetic exciter 12 and a first buffer assembly, the seed trough 11 is located below the seed storage box 10, the mover of the first electromagnetic exciter 12 is fixedly connected to the outer bottom surface of the seed trough 11, the shell of the first electromagnetic exciter 12 is fixedly connected to the first buffer assembly, the first buffer assembly includes a first top plate 32, a first elastic support member 33 and a first base 34, and the first top plate 32 is fixedly connected to the first base 34 through the first elastic support member 33. The bottom outlet of the seed storage box 10 is set at an appropriate distance above the inlet of the seed trough 11, which is used to transport seeds into the seed trough 11; the first electromagnetic exciter 12 is installed below the seed trough 11, and the vibration amplitude of two gears is set by phase shift triggering, so as to adjust the speed of seeding; the first elastic support member 33 is placed between the first top plate 32 and the first base 34, which is used to buffer the dynamic load transmitted to the first top plate 32.

[0037] It is further preferred in the implementation manner of this embodiment that the first weighing hopper includes a first hopper box 13, a first blanking plate 35, a first weighing sensor 15, a first electric servo 14 and a connecting rod 36, the first hopper box 13 has a first feed port and a first discharge port, the first blanking plate 35 is rotatably connected to the first hopper box 13, and is used to open and close the first discharge port, the first electric servo 14 is fixedly connected to the first hopper box 13, the output shaft of the first electric servo 14 is fixedly connected to one end of the connecting rod 36, the other end of the connecting rod 36 is fixedly connected to the first blanking plate 35, the first weighing sensor 15 is fixedly connected to the first hopper box 13, and the first weighing sensor 15 and the first electric servo 14 are both connected to the controller signal. A first weighing sensor 15 is installed below the first hopper box 13 for real-time monitoring of the amount of seeds in the first hopper box 13, and a first electric servo 14 is installed on the first hopper box 13. When the weight of the seeds in the first hopper box 13 reaches a preset seed supply quality, the output shaft of the first electric servo 14 rotates a certain angle, and drives the first blanking plate 35 to open through the connecting rod 36, so that the seeds in the first hopper box 13 are transported to the coating pot 30 through the seed delivery pipeline.

[0038] In the implementation of this embodiment, it is further preferred that Figure 5 As shown, the powder box includes a powder storage box 16 and a powder material trough 17, the second exciter includes a second electromagnetic exciter 18 and a second buffer assembly, the powder material trough 17 is located below the powder storage box 16, the mover of the second electromagnetic exciter 18 is fixedly connected to the outer bottom surface of the powder material trough 17, the housing of the second electromagnetic exciter 18 is fixedly connected to the second buffer assembly, the second buffer assembly includes a second top plate 37, a second elastic support member 38 and a second base 39, and the second top plate 37 is fixedly connected to the second base 39 through the second elastic support member 38. The structure of the powder box is the same as that of the seed box.

[0039] In the implementation of this embodiment, it is further preferred that the second weighing hopper includes a second hopper box 19, a second blanking plate 40, a second weighing sensor 21 and a second electric servo 20, the second hopper box 19 has a second feed port and a second discharge port, the second blanking plate 40 is rotatably connected to the second hopper box 19 for opening and closing the second discharge port, the second electric servo 20 is fixedly connected to the second hopper box 19 via a rotating shaft 41, the output shaft of the second electric servo 20 is fixedly connected to the rotating shaft 41, the second weighing sensor 21 is fixedly connected to the second hopper box 19, and the second weighing sensor 21 and the second electric servo 20 are both connected to the controller signal. The second weighing hopper has a similar structure to the first weighing hopper. When the weight of the powder in the second hopper box 19 reaches a preset powder mass, the output shaft of the second electric servo 20 drives the rotating shaft 41 to rotate a certain angle, and drives the second blanking plate 40 to open through the rotating shaft 41, so that the powder in the second hopper box 19 is transported to the coating pot 30 through the powder conveying pipeline.

[0040] In the implementation of this embodiment, it is further preferred that the liquid medicine tank 29 is connected to the proportional control three-way valve 26 through the liquid medicine pipe, the clean water tank 28 is connected to the proportional control three-way valve 26 through the clean water pipe, a liquid medicine flowmeter 25 is provided on the liquid medicine pipe, a clean water flowmeter 24 is provided on the clean water pipe, both the liquid medicine flowmeter 25 and the clean water flowmeter 24 are connected to the controller signal, the controller adjusts the opening of the proportional control three-way valve 26 by proportional-integral adjustment, and the liquid supply pipe 5 is provided with a solenoid valve 27 for opening or stopping the liquid supply, and the solenoid valve 27 is connected to the controller signal. In the liquid supply device 9, the controller uses a PI (proportional-integral) control algorithm to adjust the opening of the proportional control three-way valve 26, so as to accurately control the liquid medicine ratio, and the clean water flowmeter 24 and the liquid medicine flowmeter 25 are used to monitor the liquid medicine ratio and the liquid supply volume in real time; the solenoid valve 27 installed on the liquid supply pipe 5 connected to the liquid outlet of the peristaltic pump 8 is used to open or stop the liquid supply.

[0041] It is further preferred in the implementation manner of this embodiment that the driving device includes a three-phase AC motor 3 and a frequency converter 31, and a speed sensor 22 is installed on the rotating shaft 41 of the three-phase AC motor 3, and the speed sensor 22 is connected to the controller signal. The controller adjusts the voltage across the frequency converter 31 through a PWM signal to change the speed of the three-phase AC motor 3, and measures the speed of the three-phase AC motor 3 in real time through the speed sensor 22, thereby obtaining the speed of the three-phase AC motor 3 corresponding to different PWM duty cycles, and adjusting the speed of the coating pot 30 by adjusting the PWM duty cycle.

[0042] In the implementation of this embodiment, it is further preferred that the controller includes a central processor 23 and a touch screen 7 electrically connected to the central processor 23, the touch screen 7 communicates with the central processor 23 in a serial communication mode, and the touch screen 7 is used to set and display information such as seed drop mass, pelleting times, single powder drop mass, single liquid supply, speed of the pelleting coating device 2 and single idling time; the first weighing sensor 15, the second weighing sensor 21, the speed sensor 22, the liquid flow meter 25 and the clean water flow meter 24 feed back the detection value to the central processor 23 in real time; the central processor 23 controls the first electromagnetic exciter 12, the first electric steering gear 14, the second exciter, the second electric steering gear 20, the three-phase AC motor 3, the frequency converter 31, the proportional control three-way valve 26 and the electromagnetic valve 27 to operate. The central processor 23 controls the seed supply device 1, the powder supply device 6, the liquid supply device 9 and the pelleting coating device 2 to achieve coordinated and orderly operation of each system, and inputs and displays parameters through the touch screen 7 to achieve full-automatic coating of small-grain forage seeds.

[0043] Example 2

[0044] This embodiment provides a coating method using the small-grain forage seed fully automatic pelletizing coating system of embodiment 1, comprising the following steps:

[0045] Step 1: Set the seed dropping mass, pelleting times, single powder dropping mass, single liquid supply, pelleting coating device 2 speed and single idling time through the controller. After the settings are completed, click the run button, the coating system will automatically run and the controller will automatically switch to the monitoring equipment operation interface;

[0046] Step 2, after the setting is completed, the controller controls the first vibrator to vibrate the seed box at a high gear to make the seeds fall, and monitors the weight of the seeds in the first weighing hopper in real time through the signal fed back by the first weighing hopper. When the difference is 20g and the seed falling mass is not reached, the controller controls the first vibrator to adjust to a low gear. When the seed falling mass is reached, the controller controls the first vibrator to stop vibrating, and controls the first weighing hopper to transport a certain amount of seeds to the coating pot 30.

[0047] Step 3: The controller controls the second vibrator to vibrate the powder box at a high gear to make the powder fall, and monitors the weight of the powder in the second weighing hopper in real time through the signal fed back by the second weighing hopper. When the difference is 10g and the powder falling mass is not reached, the controller controls the second vibrator to adjust to a low gear. When the powder falling mass is reached, the controller controls the second vibrator to stop vibrating, and controls the second weighing hopper to deliver a certain amount of powder to the coating pan 30.

[0048] Step 4: After the seed supply and the single powder supply are completed, the controller controls the pelletizing coating device 2 to rotate at a preset speed;

[0049] Step 5, after the pelleting coating device 2 is operated until the seeds and powder are fully mixed, the controller controls the liquid supply device 9 to adjust the opening of the proportional control three-way valve 26 in a proportional-integral adjustment manner, thereby controlling the liquid-drug ratio, and the controller controls the peristaltic pump 8 to open and transport the mixed liquid to the coating pot 30. When the single liquid supply volume is reached, the controller controls the peristaltic pump 8 to close;

[0050] Step 6: After the liquid supply is completed, the pelletizing and coating device 2 performs seed pelleting once according to the set single idle time;

[0051] Step seven, after a single seed pelleting, repeat steps three to six according to the number of pelleting times set by the controller. When the preset number of pelleting times is reached and the seeds are pelleted for the last time, the controller controls the coating pan to idle for 20 seconds. After the idling ends, the pelleting coating is completed.

[0052] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fully automatic pelletizing and coating system for small-grain forage seeds, characterized by: include: frame; A pelletizing coating device; the pelletizing coating device is fixed on the frame, and comprises a driving device and a coating pan, wherein the driving device is connected to the rotating shaft of the coating pan; A seed supply device; the seed supply device is fixed on the frame, the seed supply device comprises a seed box, a first vibrator and a first weighing hopper, the first vibrator has two vibration amplitudes, the first vibrator is fixedly connected to the seed box, the first weighing hopper is located below the seed box, and the first weighing hopper is connected to the coating pan through a seed delivery pipeline; A powder supply device; the powder supply device is fixed on the frame, the powder supply device comprises a powder box, a second vibrator and a second weighing hopper, the second vibrator has two vibration amplitudes, the second vibrator is fixedly connected to the powder box, the second weighing hopper is located below the powder box, and the second weighing hopper is connected to the coating pan through a powder conveying pipeline; A liquid supply device; the liquid supply device is fixed on the frame, and the liquid supply device comprises a liquid medicine tank, a clean water tank, a proportional control three-way valve and a peristaltic pump, the liquid medicine tank and the clean water tank are connected to the peristaltic pump through the proportional control three-way valve, and the peristaltic pump is connected to the coating pot through a liquid supply pipe; Controller; the driving device, the first vibrator, the first weighing hopper, the second vibrator, the second weighing hopper, the proportional control three-way valve and the peristaltic pump are all connected to the controller signal.

2. The fully automatic pelletizing and coating system for small-grain forage seeds according to claim 1 is characterized in that: The seed box includes a seed storage box and a seed trough, the first vibrator includes a first electromagnetic vibrator and a first buffer assembly, the seed trough is located below the seed storage box, the mover of the first electromagnetic vibrator is fixedly connected to the outer bottom surface of the seed trough, the shell of the first electromagnetic vibrator is fixedly connected to the first buffer assembly, the first buffer assembly includes a first top plate, a first elastic support member and a first base, and the first top plate is fixedly connected to the first base via the first elastic support member.

3. The fully automatic pelletizing and coating system for small-grain grass seeds according to claim 2 is characterized in that: The first weighing hopper includes a first hopper box, a first blanking plate, a first weighing sensor, a first electric servo and a connecting rod. The first hopper box has a first feed port and a first discharge port. The first blanking plate is rotatably connected to the first hopper box for opening and closing the first discharge port. The first electric servo is fixedly connected to the first hopper box. The output shaft of the first electric servo is fixedly connected to one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the first blanking plate. The first weighing sensor is fixedly connected to the first hopper box. Both the first weighing sensor and the first electric servo are connected to the controller signal.

4. The fully automatic pelletizing and coating system for small-grain forage seeds according to claim 1 is characterized in that: The powder box includes a powder storage box and a powder trough, the second exciter includes a second electromagnetic exciter and a second buffer assembly, the powder trough is located below the powder storage box, the mover of the second electromagnetic exciter is fixedly connected to the outer bottom surface of the powder trough, the shell of the second electromagnetic exciter is fixedly connected to the second buffer assembly, the second buffer assembly includes a second top plate, a second elastic support member and a second base, and the second top plate is fixedly connected to the second base via the second elastic support member.

5. The fully automatic pelletizing and coating system for small-grain grass seeds according to claim 4 is characterized in that: The second weighing hopper includes a second hopper box, a second blanking plate, a second weighing sensor and a second electric servo. The second hopper box has a second feed port and a second discharge port. The second blanking plate is rotatably connected to the second hopper box through a rotating shaft for opening and closing the second discharge port. The second electric servo is fixedly connected to the second hopper box, and the output shaft of the second electric servo is fixedly connected to the rotating shaft. The second weighing sensor is fixedly connected to the second hopper box, and both the second weighing sensor and the second electric servo are connected to the controller signal.

6. The fully automatic pelletizing and coating system for small-grain grass seeds according to claim 1 is characterized in that: The medicine liquid tank is connected to the proportional control three-way valve through a medicine liquid pipe, and the clean water tank is connected to the proportional control three-way valve through a clean water pipe. A medicine liquid flow meter is provided on the medicine liquid pipe, and a clean water flow meter is provided on the clean water pipe. Both the medicine liquid flow meter and the clean water flow meter are connected to the controller signal.

7. The fully automatic pelletizing and coating system for small-grain grass seeds according to claim 1 is characterized in that: The controller adjusts the opening of the proportional control three-way valve by a proportional-integral adjustment method.

8. The fully automatic pelletizing and coating system for small-grain forage seeds according to claim 1 is characterized in that: The liquid supply pipe is provided with a solenoid valve for opening or stopping the liquid supply, and the solenoid valve is connected to the controller signal.

9. The fully automatic pelletizing and coating system for small-grain forage seeds according to claim 1 is characterized in that: The driving device includes a three-phase AC motor and a frequency converter. A speed sensor is installed on the rotating shaft of the three-phase AC motor. The speed sensor is connected to the controller signal. The controller changes the speed of the three-phase AC motor by adjusting the voltage across the frequency converter through a PWM signal, and measures the speed of the three-phase AC motor in real time through the speed sensor.

10. A coating method using the small-grain forage seed fully automatic pelletizing coating system according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, setting the seed dropping mass, pelleting times, single powder dropping mass, single liquid supply, pelleting coating device speed and single idling time through the controller; Step 2, after the setting is completed, the controller controls the first vibrator to vibrate the seed box at a high gear to make the seeds fall, and monitors the weight of the seeds in the first weighing hopper in real time through the signal fed back by the first weighing hopper. When the difference is 20g and the seed falling mass is not reached, the controller controls the first vibrator to adjust to a low gear. When the seed falling mass is reached, the controller controls the first vibrator to stop vibrating, and controls the first weighing hopper to transport a certain amount of seeds to the coating pot. Step three, the controller controls the second vibrator to vibrate the powder box at a high gear to make the powder fall, and monitors the weight of the powder in the second weighing hopper in real time through the signal fed back by the second weighing hopper. When the difference is 10g and the powder falling mass is not reached, the controller controls the second vibrator to adjust to a low gear. When the powder falling mass is reached, the controller controls the second vibrator to stop vibrating, and controls the second weighing hopper to transport a certain amount of powder to the coating pan. Step 4: After the seed supply and the single powder supply are completed, the controller controls the pelletizing and coating device to rotate at a preset speed; Step 5, after the pelleting coating device runs until the seeds and powder are fully mixed, the controller controls the liquid supply device to adjust the opening of the proportional control three-way valve in a proportional-integral regulation mode, thereby controlling the liquid-drug ratio, and the controller controls the peristaltic pump to open and deliver the mixed liquid to the coating pot. When the single liquid supply volume is reached, the controller controls the peristaltic pump to close; Step 6: After the liquid supply is completed, the pelletizing and coating device performs seed pelleting once according to the set single idle time; Step seven, after a single seed pelleting, repeat steps three to six according to the number of pelleting times set by the controller. When the preset number of pelleting times is reached and the seeds are pelleted for the last time, the controller controls the coating pan to idle for 20 seconds. After the idling ends, the pelleting coating is completed.

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