A method for online recycling of feed mill head and tail feed.

Abstract

This invention discloses a method for online recycling of feed mill head and tail feed. The method includes a feed hopper to be pelleted, a feeder buffer hopper, a pellet mill, a cooler, and a rotary classifier. It also includes an auger sampler, a first pneumatic tee, a dry / wet powder buffer hopper, and a return powder buffer hopper. The auger sampler is located at the sampling port of the feed hopper to be pelleted. The outlet of the auger sampler is connected to the inlet of the dry / wet powder buffer hopper, and the outlet of the dry / wet powder buffer hopper is connected to the inlet of the return powder buffer hopper. The outlet of the return powder buffer hopper is connected to the inlet of the feeder buffer hopper. The inlet of the first pneumatic tee is connected to the outlet of the pellet mill. One outlet of the first pneumatic tee is connected to the inlet of the dry / wet powder buffer hopper, and the other outlet is connected to the inlet of the cooler. The fine powder outlet is connected to the inlet of the return powder buffer hopper. This invention enables online recycling of feed mill head and tail feed, effectively reducing labor intensity, production costs, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to a method for online recycling of feed mill head and tail feed, belonging to the field of feed preparation technology. Background Technology

[0002] The pelleting process in feed mills involves pressing uniformly mixed materials into pellets using a pellet mill under high-temperature steam and intense extrusion. These pellets are then cooled and sieved to obtain the finished pelleted feed. Currently, the following situations may occur during the pelleting process in feed mills:

[0003] 1) When the pellet mill is first started, there may be some hot powder material that is not suitable for pelleting in the initial stage;

[0004] 2) The pellet mill will produce some substandard pellets at the beginning of operation;

[0005] 3) When production is nearing its end, the steam will be shut off because the granulator cannot be filled with material, resulting in the remaining powder being unable to be granulated.

[0006] 4) After the pellet mill stops, there will be rotary screen fine powder that cannot be used in the same shift.

[0007] In response to the above situations, the industry currently mainly relies on manual collection and refeeding into mixers for reuse. This results in high labor intensity, low production efficiency, and high production costs. It also fails to achieve online collection of head and tail materials and timely online reuse, which not only wastes energy but also easily leads to cross-contamination of feed, affecting the quality of feed products. Summary of the Invention

[0008] To address the aforementioned problems in the existing technology, the purpose of this invention is to provide a method for online recycling of feed mill head and tail feed.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A method for online recycling of feed mill head and tail feed from a feed mill includes a pelleting silo, a feeder buffer hopper, a pellet mill, a cooler, and a rotary classifier. The feeder buffer hopper is located at the feed inlet of the pellet mill, and the discharge outlet of the pelleting silo is connected to the feed inlet of the feeder buffer hopper via a pipeline. The discharge outlet of the cooler is connected to the feed inlet of the rotary classifier via a pipeline, and the rotary classifier has a fine powder discharge outlet. The method is characterized by further including an auger sampler, a first pneumatic tee, a dry / wet powder buffer silo, and a recycled powder buffer silo, wherein the auger sampler is located at the sampling port of the pelleting silo, and the discharge outlet of the auger sampler... The sample outlet is connected to the inlet of the wet-dry powder buffer silo via a pipeline; the outlet of the wet-dry powder buffer silo is connected to the inlet of the return powder buffer silo via a pipeline; the outlet of the return powder buffer silo is connected to the inlet of the feeder buffer hopper via a pipeline; the first pneumatic tee is located at the outlet of the granulator, the inlet of the first pneumatic tee is connected to the outlet of the granulator, one outlet of the first pneumatic tee is connected to the inlet of the wet-dry powder buffer silo, the other outlet of the first pneumatic tee is connected to the inlet of the cooler, and the fine powder outlet is connected to the inlet of the return powder buffer silo; the method includes the following steps:

[0011] a) Before starting the pellet mill, turn on the auger sampler to send a portion of the dry material in the pelleting bin to the wet-dry powder buffer bin.

[0012] b) When the pellet mill is blocked or there is excess material, first open the pipeline between the first pneumatic tee and the dry-wet powder buffer silo to send the initial hot powder and / or unqualified pellets generated in the pellet mill to the dry-wet powder buffer silo and mix them with the dry material in the dry-wet powder buffer silo; repeat this cycle. During this process, the auger sampler should always be kept open until the pellet mill produces qualified pellets. Then close the pipeline between the first pneumatic tee and the dry-wet powder buffer silo.

[0013] c) The dry and wet materials mixed in the dry and wet powder buffer bin and the fine powder obtained by the rotary classifier screen are sent to the return powder buffer bin and then fed into the pellet mill for re-granulation through the feeder buffer hopper.

[0014] d) When production is nearing its end and the pellet mill's modulator cannot be filled with material, open the pipeline between the first pneumatic tee and the dry-wet powder buffer chamber to allow the remaining powder in the pellet mill to be temporarily stored in the dry-wet powder buffer chamber.

[0015] e) When the granulator stops, all materials in the dry and wet powder buffer bins and the remaining fine powder obtained from the rotary classifier are sent to the return powder buffer bin for temporary storage, to be used for the next shift of granulation.

[0016] One embodiment further includes a second pneumatic tee, which is located at the inlet of the return powder buffer silo. The inlet of the second pneumatic tee is simultaneously connected to the outlet of the dry and wet powder buffer silo and the fine powder outlet of the rotary classifier. The two outlets of the second pneumatic tee are respectively connected to the inlet of a return powder buffer silo.

[0017] In one implementation, when the pellet mill produces qualified pellets, the pipeline between the first pneumatic tee and the cooler is opened, so that the intermediate material produced by the pellet mill is cooled by the cooler and then transported through the pipeline to the rotary grading screen for screening.

[0018] One embodiment further includes a cooling air network system, which includes a cyclone separator and air ducts. The air intake of the cyclone separator is connected to a cooler, a dry and wet powder buffer chamber, and a pipeline connecting the first pneumatic tee to the dry and wet powder buffer chamber via the air ducts.

[0019] In a preferred embodiment, a first screw conveyor is provided at the discharge port of the scythron, and the discharge port of the scythron is connected to the inlet of the dry and wet powder buffer silo through the first screw conveyor and pipeline.

[0020] In a preferred embodiment, an upper feeder is provided in the upper part of the dry-wet powder buffer silo, and a lower feeder is provided in the lower part of the dry-wet powder buffer silo.

[0021] In a further preferred embodiment, a second screw conveyor is provided at the discharge port of the dry and wet powder buffer silo. The discharge port of the second screw conveyor is connected to a first bucket elevator via a pipeline. The discharge port of the first bucket elevator is connected to the inlet of the return powder buffer silo via a pipeline. When the material level sensor senses that there is material, the second screw conveyor and the first bucket elevator are started.

[0022] In one embodiment, a third pneumatic tee is provided at the feed inlet of the rotary classifier. The feed inlet of the third pneumatic tee is connected to the discharge outlet of the cooler. One discharge outlet of the third pneumatic tee is connected to the feed inlet of the rotary classifier, and the other discharge outlet of the third pneumatic tee is connected to the feed inlet of the return powder buffer bin via a pipeline.

[0023] In a preferred embodiment, an automatic sampler is provided on the pipeline between the inlet of the third pneumatic tee and the outlet of the cooler.

[0024] In a further optimized scheme, a horizontal scraper conveyor and a second bucket elevator are sequentially installed on the pipeline between the outlet of the cooler and the third pneumatic tee, and the automatic sampler is located on the pipeline between the outlet of the second bucket elevator and the inlet of the third pneumatic tee.

[0025] In one implementation, when the automatic sampler detects that the material is unqualified, the unqualified material is sent to the powder return buffer bin through another outlet and pipeline of the third pneumatic tee.

[0026] In a preferred embodiment, a temperature sensor for detecting the material temperature is provided inside the cooler near the discharge port.

[0027] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0028] 1. This invention enables timely online reuse of hot powder materials and / or unqualified granules that are unsuitable for granulation during the initial startup of the pellet mill;

[0029] 2. This invention also allows the remaining powder in the pellet mill to be temporarily stored in the powder return buffer bin when production is nearing its end, so that it can be used in the next shift, thus realizing the online reuse of pellet mill tail material;

[0030] 3. This invention also enables the remaining material in the dry and wet powder buffer bin and the remaining fine powder screened by the rotary grading screen to be temporarily stored in the powder return buffer bin after the granulator stops, so as to be used in the next shift. This fully realizes the reuse of materials and avoids material waste.

[0031] In summary, the method described in this invention not only enables automatic online recycling of pellet mill head and tail materials, effectively reducing labor intensity, production costs, and improving production efficiency, but also effectively avoids cross-contamination of feed, ensuring the quality of feed products. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a system structure that enables the online recycling of feed mill head and tail materials as described in this invention, provided by an embodiment. The arrows in the diagram indicate the flow direction of the material, and the lines with arrows at the ends indicate pipelines for material flow.

[0033] The diagram is labeled as follows: 1. Pelletizing hopper; 2. Screw sampler; 3. Feeder buffer hopper; 4. Pelletizer; 5. First pneumatic tee; 6. Cooler; 7. Claxon; 8. First screw conveyor; 9. Horizontal scraper conveyor; 10. Loading level device; 11. Dry / wet powder buffer hopper; 12. Unloading level device; 13. Second screw conveyor; 14. First bucket elevator; 15. Second pneumatic tee; 16. Return powder buffer hopper; 17. Second bucket elevator; 18. Automatic sampler; 19. Third pneumatic tee; 20. Rotary grading screen; 20-1. Fine powder outlet; 20-2. Finished product outlet; 20-3. Large impurity outlet; 21. Temperature sensor; 22. Finished product hopper; 23. Large impurity collection box. Detailed Implementation

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Example

[0036] Figure 1 The diagram shown is a schematic representation of a system structure that enables the online reuse of feed mill head and tail materials as described in this invention. Figure 1 As can be seen, the system includes a pelleting hopper 1, an auger sampler 2, a feeder buffer hopper 3, a pellet mill 4, a first pneumatic tee 5, a cooler 6, a dry / wet powder buffer hopper 11, a second pneumatic tee 15, a return powder buffer hopper 16, and a rotary classifying screen 20; among which,

[0037] The auger sampler 2 is located at the sampling port on the hopper of the granulation bin 1. The outlet of the auger sampler 2 is connected to the inlet of the dry and wet powder buffer bin 11 through a pipeline. The outlet of the dry and wet powder buffer bin 11 is connected to the inlet of the return powder buffer bin 16 through a pipeline.

[0038] The feeder buffer hopper 3 is located at the feed inlet of the granulator 4, and the discharge outlet of the granulation bin 1 and the discharge outlet of the return powder buffer bin 16 are both connected to the feed inlet of the feeder buffer hopper 3 through pipelines.

[0039] The first pneumatic tee 5 is located at the discharge port of the granulator 4. The first pneumatic tee 5 has one inlet and two outlets. The inlet of the first pneumatic tee 5 is connected to the discharge port of the granulator 4. One outlet of the first pneumatic tee 5 is connected to the inlet of the dry and wet powder buffer silo 11. The other outlet of the first pneumatic tee 5 is connected to the inlet of the cooler 6.

[0040] The outlet of the cooler 6 is connected to the inlet of the rotary classifier 20 via a pipeline. The rotary classifier 20 is provided with a fine powder outlet 20-1, a finished product outlet 20-2, and a large impurity outlet 20-3. The fine powder outlet 20-1 is connected to the inlet of the return powder buffer silo 16 via a pipeline. The finished product outlet 20-2 is connected to the finished product silo 22 via a pipeline. The large impurity outlet 20-3 is connected to the large impurity collection box 23 via a pipeline.

[0041] The second pneumatic tee 15 is located at the inlet of the powder return buffer silo 16. The second pneumatic tee 15 has one inlet and two outlets. The two outlets of the second pneumatic tee 15 are respectively connected to the inlet of one powder return buffer silo 16 (there are two powder return buffer silos 16 in the figure). The inlet of the second pneumatic tee 15 is also connected to the outlet of the dry and wet powder buffer silo 11 and the fine powder outlet of the rotary classifier sieve 20.

[0042] Now combined Figure 1The system shown in the present invention provides a detailed description of the method for online recycling of feed mill head and tail feed, comprising the following steps:

[0043] a) Before starting the pellet mill 4, turn on the auger sampler 2 first, and send a portion of the dry material in the pelleting bin 1 to the dry and wet powder buffer bin 11 through the auger sampler 2.

[0044] b) Start the pellet mill 4. When the pellet mill 4 experiences blockage or has loose material, open the pipeline between the first pneumatic tee 5 and the inlet of the wet-dry powder buffer silo 11, connecting the outlet of the pellet mill 4 with the inlet of the wet-dry powder buffer silo 11. This allows the initial hot powder and / or substandard pellets produced in the pellet mill 4 to be transported to the wet-dry powder buffer silo 11 via the first pneumatic tee 5 and the pipeline, where they mix with the dry material flowing into the wet-dry powder buffer silo 11 via the auger sampler 2. Open the pipeline between the second pneumatic tee 15 and the outlet of the wet-dry powder buffer silo 11, allowing the mixed wet and dry materials in the wet-dry powder buffer silo 11 to pass through the second pneumatic tee 15. The material is transported through pipelines to the return powder buffer silo 16, then through pipelines to the feeder buffer hopper 3, and then from the feeder buffer hopper 3 into the pellet mill 4 for re-granulation. During this process, the auger sampler 2 remains open. This cycle is repeated until the pellet mill 4 produces qualified pellets. Then, the pipeline between the first pneumatic tee 5 and the feed inlet of the dry-wet powder buffer silo 11 is closed, and the pipeline between the first pneumatic tee 5 and the cooler 6 is opened. The auger sampler 2 continues to send a portion of the dry material in the pelleting silo 1 to the dry-wet powder buffer silo 11 for later use (to prevent the pellet mill 4 from clogging or producing excess material). Then, the auger sampler 2 is shut down.

[0045] c) After the pellet mill 4 produces qualified pellets, open the pipeline between the first pneumatic tee 5 and the feed inlet of the cooler 6, so that the intermediate material produced by the pellet mill 4 is cooled by the cooler 6 and then transported through the pipeline to the rotary classifier 20 for screening. The fine powder material screened out is sent from the fine powder outlet 20-1 through the pipeline into the return powder buffer bin 16, and then sent back into the pellet mill 4 for re-granulation through the return powder buffer bin 16 and the feeder buffer hopper 3. The finished product material screened out is sent from the finished product outlet 20-2 through the pipeline into the finished product bin 22, and the large impurities screened out are sent from the large impurities outlet 20-3 through the pipeline into the large impurities collection box 23.

[0046] d) When production is nearing its end and the modulator of the pellet mill 4 cannot be filled with material, open the pipeline between the first pneumatic tee 5 and the feed inlet of the dry and wet powder buffer silo 11 to send the remaining powder in the pellet mill 4 into the dry and wet powder buffer silo for temporary storage.

[0047] e) When the granulator 4 stops, all materials in the dry and wet powder buffer bin 11 and the fine powder obtained by the rotary classifier 20 are sent to the return powder buffer bin 16 through the pipeline for temporary storage, so as to be used for the next shift of granulation.

[0048] As a preferred embodiment, the above system further includes a cooling air network system, which comprises a cyclone separator 7 and air ducts. The air intake of the cyclone separator 7 is connected via the air ducts to the cooler 6, the dry / wet powder buffer chamber 11, and the pipeline connecting the first pneumatic tee 5 and the dry / wet powder buffer chamber 11. The air ducts and cyclone separator 7 are used to draw air, dehumidify, and cool the materials within the pipeline connecting the first pneumatic tee 5 and the dry / wet powder buffer chamber 11, as well as the cooler 6 and the dry / wet powder buffer chamber 11, to prevent material adhesion and mold growth, further ensuring product quality.

[0049] Furthermore, the discharge port of the cyclone 7 is connected to the inlet of the wet and dry powder buffer silo 11 via a pipeline. A first screw conveyor 8 is installed on the pipeline between the discharge port of the cyclone 7 and the inlet of the wet and dry powder buffer silo 11. Because the cyclone 7 has its own exhaust fan, when the cyclone 7 performs suction and dehumidification treatment on the cooler 6, the wet and dry powder buffer silo 11, and the pipeline connecting the first pneumatic tee 5 and the wet and dry powder buffer silo 11, some powder will inevitably be drawn into the cyclone 7. Therefore, this part of the powder can be transported to the wet and dry powder buffer silo 11 through the first screw conveyor 8 at the bottom discharge port of the cyclone 7 for recycling, thereby reducing material waste.

[0050] In this embodiment, an upper feed level device 10 is provided in the upper part of the dry-wet powder buffer silo 11, and a lower feed level device 12 is provided in the lower part of the dry-wet powder buffer silo 11. A second screw conveyor 13 is provided at the discharge port of the dry-wet powder buffer silo 11. The discharge port of the second screw conveyor 13 is connected to a first bucket elevator 14 through a pipeline. The discharge port of the first bucket elevator 14 is connected to the inlet of the return powder buffer silo 16 through a pipeline. The lower feed level device 12 is used to sense whether the auger sampler 2 is feeding dry material into the dry-wet powder buffer silo 11. When the upper feed level device 10 senses that there is material, the second screw conveyor 13 and the first bucket elevator 14 are started. The second screw conveyor 13 and the first bucket elevator 14 are used to transport the material in the dry-wet powder buffer silo 11 to the return powder buffer silo 16.

[0051] Furthermore, the rotary classifier 20 has a third pneumatic tee 19 at its inlet. This third pneumatic tee 19 has one inlet and two outlets. The inlet of the third pneumatic tee 19 is connected to the outlet of the cooler 6. One outlet of the third pneumatic tee 19 is connected to the inlet of the rotary classifier 20, and the other outlet of the third pneumatic tee 19 is connected to the inlet of the return powder buffer silo 16. The inlet of the third pneumatic tee 19 is connected to the outlet of the cooler 6. An automatic sampler 18 is installed on the pipeline between the feed inlets. The intermediate material produced by the granulator 4, after being cooled by the cooler 6, is sampled and tested by the automatic sampler 18 before entering the rotary classifier 20. When the material is found to be substandard, the pipeline between the third pneumatic tee 19 and the feed inlet of the return powder buffer silo 16 is opened, allowing the substandard material to be sent to the return powder buffer silo 16 for reuse and re-granulation. This enables online reuse of substandard granules generated during the granulator 4's production process. In this embodiment, one outlet connected to the feed inlet of the third pneumatic tee 19 and the return powder buffer silo 16 is the substandard material outlet during production. This substandard material outlet, like the fine powder outlet of the rotary classifier 20, is connected to the feed inlet of the second pneumatic tee 15 via a pipeline, and then to the return powder buffer silo 16.

[0052] In addition, a horizontal scraper conveyor 9 and a second bucket elevator 17 are sequentially installed on the pipeline between the discharge port of the cooler 6 and the third pneumatic tee 19. The automatic sampler 18 is located on the pipeline between the discharge port of the second bucket elevator 17 and the inlet of the third pneumatic tee 19. The intermediate material produced by the granulator 4 is cooled by the cooler 6 and then transported to the rotary classifying screen 20 for screening via the horizontal scraper conveyor 9, the second bucket elevator 17, and the pipeline.

[0053] In addition, a temperature sensor 21 is provided in the cooler 6 near the discharge port to detect the temperature of the material after it has been cooled by the cooler 6 in real time.

[0054] The granulation hopper 1, auger sampler 2, feeder buffer hopper 3, granulator 4, first pneumatic tee 5, cooler 6, cyclone 7, first screw conveyor 8, horizontal scraper conveyor 9, loading positioner 10, dry and wet powder buffer hopper 11, unloading positioner 12, second screw conveyor 13, first bucket elevator 14, second pneumatic tee 15, return powder buffer hopper 16, second bucket elevator 17, automatic sampler 18, third pneumatic tee 19, rotary grading screen 20, and temperature sensor 21 described in this invention can all adopt existing technologies.

[0055] In summary, this invention not only enables the online collection and reuse of hot powder generated during the initial startup and near the end of production of the pellet mill 4, as well as unqualified pellets generated at the beginning of pelleting and the rotary screen fine powder generated after the pellet mill 4 stops and cannot be used in the same shift, but also enables the online collection and reuse of unqualified pellets generated during the production process of the pellet mill 4. Furthermore, it can prevent material mold and sticking, effectively reducing the labor intensity of workers, reducing production costs and improving production efficiency, while also avoiding cross-contamination and ensuring the quality of feed products. Therefore, this invention has significant progressiveness and practical value compared to the prior art.

[0056] Finally, it should be pointed out that the above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for realizing on-line recycling of head and tail materials of a feed plant granulator, comprising a to-be-granulated material bin, a feeder buffer hopper, a granulator, a cooler and a rotary classifier screen, the feeder buffer hopper is arranged at a feeding port of the granulator, a discharge port of the to-be-granulated material bin is connected with a feeding port of the feeder buffer hopper through a pipeline; a discharge port of the cooler is connected with a feeding port of the rotary classifier screen through a pipeline, and the rotary classifier screen is provided with a fine powder discharge port; characterized in that: The device further comprises an auger sampler, a first pneumatic tee, a dry-wet powder buffer bin and a powder return buffer bin, wherein: the auger sampler is arranged at a sampling port of a material bin to be granulated, an outlet of the auger sampler is connected to an inlet of the dry-wet powder buffer bin through a pipeline, an outlet of the dry-wet powder buffer bin is connected to an inlet of the powder return buffer bin through a pipeline, an outlet of the powder return buffer bin is connected to an inlet of a buffer hopper of a feeder through a pipeline, the first pneumatic tee is arranged at an outlet of a granulator, an inlet of the first pneumatic tee is connected to the outlet of the granulator, one outlet of the first pneumatic tee is connected to the inlet of the dry-wet powder buffer bin, another outlet of the first pneumatic tee is connected to an inlet of a cooler, and a fine powder outlet is connected to the inlet of the powder return buffer bin. ​ The method comprises the following steps: a) before starting the granulator, the auger sampler is started to send a part of dry material in the material bin to be granulated into the dry-wet powder buffer bin; b) when the granulator is blocked or has a head material, the pipeline between the first pneumatic tee and the dry-wet powder buffer bin is opened to send the initial hot powder material and / or unqualified granulated material generated in the granulator into the dry-wet powder buffer bin and mix with the dry material in the dry-wet powder buffer bin; the above process is repeated, and the auger sampler is kept open until the granulator produces qualified granulated material, and then the pipeline between the first pneumatic tee and the dry-wet powder buffer bin is closed; c) the mixed dry-wet material in the dry-wet powder buffer bin and the fine powder material obtained by screening through a rotary classifier are sent into the powder return buffer bin, and then sent into the granulator through the buffer hopper of the feeder to be re-granulated; d) when the production is close to the end and the conditioner of the granulator cannot be filled with material, the pipeline between the first pneumatic tee and the dry-wet powder buffer bin is opened again to send the remaining powder material in the granulator into the dry-wet powder buffer bin for temporary storage; 2. The method for realizing online reuse of head and tail materials of feed plant pelletizer according to claim 1, characterized in that: e) when the granulator is stopped, all the material in the dry-wet powder buffer bin and the remaining fine powder material obtained by screening through the rotary classifier are sent into the powder return buffer bin for temporary storage to be used for the next shift.

3. The method for realizing the on-line reuse of head and tail materials of feed plant pelletizing machine according to claim 1, characterized in that: The device further comprises a second pneumatic tee arranged at an inlet of the powder return buffer bin, wherein: an inlet of the second pneumatic tee is connected to an outlet of the dry-wet powder buffer bin and a fine powder outlet of the rotary classifier, and two outlets of the second pneumatic tee are respectively connected to inlets of two powder return buffer bins.

4. The method for realizing online reuse of head and tail materials of feed plant pelletizer according to claim 1, characterized in that: When the granulator produces qualified granulated material, the pipeline between the first pneumatic tee and the cooler is opened to send the intermediate material produced by the granulator into the rotary classifier through the cooler for screening.

5. The method for realizing the on-line reuse of head and tail materials of feed plant pelletizing machine according to claim 4, characterized in that: The device further comprises a cooling air net system, wherein: the cooling air net system comprises a chiller and air pipes, and air inlets of the chiller, the dry-wet powder buffer bin and the pipeline connected between the first pneumatic tee and the dry-wet powder buffer bin are respectively connected to the air pipes.

6. The method for realizing online reuse of head and tail materials of feed plant pelletizer according to claim 1, characterized in that: A first screw conveyor is arranged at an outlet of the chiller, and the outlet of the chiller is connected to the inlet of the dry-wet powder buffer bin through the first screw conveyor and the pipeline. An upper level sensor is arranged at an upper part in the dry-wet powder buffer bin, and a lower level sensor is arranged at a lower part in the dry-wet powder buffer bin.

7. The method according to claim 6, wherein the method is characterized in that: A second screw conveyor is arranged at the discharge port of the dry-wet powder buffer bin, a first bucket elevator is connected to the discharge port of the second screw conveyor through a pipeline, and the discharge port of the first bucket elevator is connected to the feed port of the powder return buffer bin through a pipeline.

8. The method for realizing online reuse of head and tail materials of feed plant pelletizer according to claim 1, characterized in that: A third pneumatic tee joint is arranged at the feed port of the rotary grading screen, the feed port of the third pneumatic tee joint is connected to the discharge port of the cooler, one-way discharge port of the third pneumatic tee joint is connected to the feed port of the rotary grading screen, and the other-way discharge port of the third pneumatic tee joint is connected to the feed port of the powder return buffer bin through a pipeline.

9. The method according to claim 8, wherein the method is characterized in that: An automatic sampler is arranged on the pipeline between the feed port of the third pneumatic tee joint and the discharge port of the cooler.

10. The method for realizing the on-line reuse of head and tail materials of feed plant pelletizing machine according to claim 9, characterized in that: A horizontal scraper conveyor and a second bucket elevator are arranged on the pipeline between the discharge port of the cooler and the third pneumatic tee joint in sequence, and the automatic sampler is arranged on the pipeline between the discharge port of the second bucket elevator and the feed port of the third pneumatic tee joint.

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