Negative pressure type mixing and distributing device for grain material sampling

Abstract

The present application relates to the technical field of material distributor, and specifically discloses a negative pressure type mixing material distributor for grain material sampling, which comprises a material distribution equipment box, a negative pressure pump, a material bin and a sample collector, the output end of the negative pressure pump is communicated with the inside of the material distribution equipment box through a negative pressure air guide pipe, and the material bin and the sample collector are both communicated with the inside of the material distribution equipment box through a material distribution negative pressure pipe. The material mixing mode of layered mixing combined with uniform speed rotation discharging is adopted, each material sent is uniformly distributed to multiple independent mixing cavities, multiple batches of materials form uniform layered structures in the mixing cavities, and the layered mixed materials are sequentially discharged through the uniformly rotating discharging frame, so that the mixing uniformity of the materials is improved without damaging the integrity of the grains, the final sample is more representative, and the problems of grain damage and uneven mixing existing in the traditional stirring type mixing are avoided.

Description

Technical Field

[0001] This invention relates to the field of material distributor technology, specifically to a negative pressure mixing and distributing device for sampling grain materials. Background Technology

[0002] In the process of grain acquisition, storage, and quality testing, the sampling and separation of grain materials are crucial steps to ensure the accuracy of test results. Traditional gravity samplers rely on the material's own weight to separate the material, which not only results in poor sample uniformity and easy particle stratification, but also generates a large amount of dust during operation, polluting the working environment and causing material loss.

[0003] To address the aforementioned issues, existing technologies have developed grain sampling equipment employing the principle of negative pressure conveying. Chinese utility model patent CN211904728U discloses an intelligent grain collection system, comprising a sampling and detection component, a sampling component, a negative pressure component, and a waste recovery component. This system utilizes negative pressure to achieve grain conveying and sampling, reducing dust pollution and material loss to some extent. However, this existing technology still has significant shortcomings. Its mixing device has a simple structure, often using direct stirring with blades, which easily damages the integrity of grain particles and makes it difficult to achieve uniform mixing of multiple batches of material, resulting in insufficient representativeness of the sampled material. Furthermore, its material control method is relatively crude, unable to achieve independent and precise control of multiple negative pressure pipelines, and negative pressure interference between different pipelines can easily occur, affecting the stability of material conveying. In addition, the equipment lacks a convenient manual sampling structure, making it impossible to quickly obtain samples without stopping the machine, and it lacks effective anti-clogging measures, allowing material to easily accumulate and clog at the receiving point, reducing the equipment's continuous operation capability and reliability. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a negative pressure mixing and distributing device for sampling grain materials.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a negative pressure mixing and distributing device for grain material sampling, comprising a distributing equipment box, a negative pressure pump, a material bin, and a sample collector. The output end of the negative pressure pump is connected to the interior of the distributing equipment box via a negative pressure air guide pipe. The material bin and the sample collector are both connected to the interior of the distributing equipment box via negative pressure distributing pipes. An inlet tank and a mixing tank are located at the top inside the distributing equipment box, and the inlet tank and the mixing tank are fixedly connected by a flange. A feeding pipe for conveying grain material is fixedly provided on one side of the inlet tank. The mixing tank has a mixing section inside for uniformly distributing the grain material. A negative pressure control section is located on one side inside the distributing equipment box for providing corresponding negative pressure for the mixing and distributing of grain material, the material recovery from the material bin, and the sample collection process of the sample collector. The lower part of the material distribution equipment box is also equipped with a receiving hopper, and the upper part of the receiving hopper is equipped with a material distribution section for uniformly distributing the grain material after the mixing process; a movable sampling frame is also slidably provided on the front of the receiving hopper.

[0006] Furthermore, the negative pressure control unit includes a negative pressure control frame fixedly installed on one side of the inner wall of the material distribution equipment box, and the front of the negative pressure control frame is connected to one end of the negative pressure air guide pipe.

[0007] Furthermore, the top ends of several material distribution negative pressure pipes extend into the interior of the negative pressure control frame. The top of the negative pressure control frame is fixedly equipped with a number of control cylinders corresponding to the material distribution negative pressure pipes, and the drive end of each control cylinder extends into the interior of the negative pressure control frame. A control valve is fixedly installed on the drive end of each control cylinder.

[0008] Furthermore, a main negative pressure pipe is fixedly installed on the rear side of the negative pressure control frame, and one end of the main negative pressure pipe extends to the upper part of the material distribution equipment box. The other end of the main negative pressure pipe is fixedly connected to the top of the feed tank. A filter frame is fixedly installed above the inside of the feed tank, and the top of the filter frame is connected to the inside of the main negative pressure pipe. A backflushing interface is also fixedly installed at the end of the main negative pressure pipe near the feed tank.

[0009] Furthermore, a material recovery pipe is fixedly provided at the bottom of the receiving hopper, and a material recovery port is provided at the top of the material recovery pipe. A screw conveyor is rotatably provided inside the material recovery pipe, and a drive motor for driving the screw conveyor to rotate is provided at one end of the material recovery pipe; a material conveying pipe is also provided at one end of the material recovery pipe, and one end of the material conveying pipe is connected to the inside of the material bin.

[0010] Furthermore, the mixing section includes a material distribution rack fixedly installed inside the mixing tank and a fixed guide rack fixedly installed at the bottom of the mixing tank. A movable baffle is provided on one side of the bottom of the fixed guide rack via a hinge.

[0011] Furthermore, a feeding rack is fixedly provided at one end of the feeding pipe extending into the feed tank, and both the upper and lower ends of the feeding rack are open; a conical platform is provided at the top of the distributing rack, and several distributing channels are provided around the distributing rack, with through holes at the bottom of each of the several distributing channels; a fixed mixing rack is fixedly provided at the bottom of the distributing rack, and several fixed partitions are fixedly provided on the outer circumference of the fixed mixing rack; the several fixed partitions divide the fixed mixing rack and the mixing tank into several mixing chambers, and the number of distributing channels corresponding to the top of each mixing chamber is the same.

[0012] Furthermore, the bottom of the fixed mixing rack is also rotatably provided with a rotating feeding rack, and both sides of the rotating feeding rack are provided with feeding channels. The fixed mixing rack is also fixedly provided with a rotating servo motor, and the output end of the rotating servo motor is fixedly connected to the inside of the rotating feeding rack.

[0013] Furthermore, the material distribution unit includes a hopper fixedly installed below the fixed guide frame via a connector and a rotating connecting seat rotatably installed at the bottom of the hopper. A rotary cylinder is fixedly installed on one side of the bottom of the hopper, and the output end of the rotary cylinder is fixedly installed on the rotating connecting seat. A control groove is provided on one side inside the rotating connecting seat, and the control groove is slidably connected on one side of the top of the rotating connecting seat. Several material distribution pipes are fixedly installed around the bottom of the rotating connecting seat, and several material distribution collection frames are also fixedly installed inside the receiving hopper.

[0014] Furthermore, at least two material distribution tubes are provided, with the bottom end of one material distribution tube located directly above the movable sampling frame, and the bottom ends of the other material distribution tubes located directly above the corresponding material collection frames; a connecting stirring frame is fixedly provided in the middle of the bottom of the rotating sleeve, and the bottom of the connecting stirring frame slides in contact with the inner surface of the receiving hopper.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: 1. By adopting a layered mixing method combined with uniformly rotating feeding, each batch of material is evenly distributed into multiple independent mixing chambers, so that multiple batches of material form a uniform layered structure in each mixing chamber. Then, the layered mixed material is released sequentially by a uniformly rotating feeding rack. This method can improve the mixing uniformity of the material without damaging the integrity of the grain particles, making the final sample more representative, thereby avoiding the problems of particle breakage and uneven mixing that exist in traditional stirring mixing.

[0016] 2. The independent cylinder-driven control valve controls the on / off of each material distribution negative pressure pipe, providing independent negative pressure power for material recovery and sample collection, avoiding negative pressure interference between different functional pipelines, and ensuring the stability of the material conveying and distribution collection process; at the same time, a filter frame with a backflushing interface is installed on the top of the feed tank, which can be regularly purged and cleaned to maintain filtration efficiency, which not only extends the continuous operation time of the equipment, but also reduces the frequency and cost of equipment maintenance.

[0017] 3. By adopting a rotary dispensing structure, the discharge position of the dispensing pipe can be precisely controlled, enabling rapid switching and distribution of materials between different collection containers. The dispensing accuracy is high and the response speed is fast, effectively avoiding cross-contamination of materials during the dispensing process. At the same time, a drawer-type movable sampling frame is set inside the receiving hopper, allowing for quick manual sampling without stopping the machine, greatly improving the convenience of sampling operations. In addition, the rotating sleeve drives the stirring frame to rotate synchronously, achieving continuous agitation of materials inside the receiving hopper without the need for an additional drive mechanism. This completely solves the problem of grain materials accumulating and clogging at the receiving point, ensuring the smoothness of the material recycling process. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a negative pressure mixing and dispensing device for sampling grain materials according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the receiving hopper and mixing tank structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the material distribution equipment box according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the negative pressure control unit structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the feed tank, receiving hopper, and mixing tank according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the feed tank and mixing tank according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the material distribution rack and fixed partition structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the fixed mixing rack and rotating feeding rack structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the fixed guide frame and discharge hopper structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the material hopper and distribution pipe structure according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the material collection frame and the connecting stirring rack structure according to an embodiment of the present invention.

[0019] In the diagram: 1. Material distribution equipment box; 2. Negative pressure pump; 3. Material silo; 4. Sample collector; 5. Feed tank; 6. Receiving hopper; 7. Mixing tank; 8. Negative pressure control frame; 9. Negative pressure vent pipe; 10. Feeding pipe; 11. Main negative pressure pipeline; 12. Material distribution negative pressure pipe; 13. Backflushing interface; 14. Control cylinder; 15. Control valve; 16. Drop hopper; 17. Material distribution section; 18. Filter frame; 19. Feeding frame; 20. Material distribution frame 21. Material distribution chute; 22. Fixed mixing rack; 23. Fixed partition; 24. Rotating discharge rack; 25. Discharge chute; 26. Rotating servo motor; 27. Movable baffle; 28. Fixed guide rack; 29. ​​Rotary cylinder; 30. Rotating sleeve; 31. Rotating connecting seat; 32. Material distribution pipe; 33. Material distribution collection frame; 34. Material recovery pipe; 35. Screw conveyor frame; 36. Movable sampling frame; 37. Connecting mixing rack. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a negative pressure mixing and distributing device for sampling grain materials.

[0023] Example 1:

[0024] Please see Figures 1 to 11As shown, a negative pressure mixing and distributing device for grain material sampling includes a distributing equipment box 1, a negative pressure pump 2, a material bin 3, and a sample collector 4. The negative pressure pump 2 is used to generate negative pressure inside the distributing equipment box 1 for distributing operations. The output end of the negative pressure pump 2 is connected to the inside of the distributing equipment box 1 through a negative pressure air guide pipe 9. The material bin 3 and the sample collector 4 are both connected to the inside of the distributing equipment box 1 through a distributing negative pressure pipe 12. The material bin 3 is used for recycling and storing grain materials, and the sample collector 4 is used for collecting the grain materials after distributing. The number of distributing and sampling structures in the sample collector 4 is selected according to the number of samples to be taken, and at least one is provided.

[0025] Specifically, the upper part of the material distribution equipment box 1 is provided with a feeding tank 5 and a mixing tank 7, and the feeding tank 5 and the mixing tank 7 are fixedly connected by a flange. A feeding pipe 10 for conveying grain materials is fixedly provided on one side of the feeding tank 5. The grain materials mixed with air are sent into the interior of the feeding tank 5 through the feeding pipe 10. The mixing tank 7 is provided with a mixing section for uniformly distributing the grain materials. A negative pressure control section is provided on one side of the material distribution equipment box 1 for providing corresponding negative pressure for the mixing and distributing of grain materials, the material recovery of the material bin 3, and the sample collection of the sample collector 4.

[0026] Furthermore, a receiving hopper 6 is fixedly installed at the bottom inside the material distribution equipment box 1, and a material distribution section is provided above the receiving hopper 6 for uniformly distributing the grain material after the mixing process. In conjunction with a corresponding number of material distribution and collection structures and sample collectors 4 installed inside the receiving hopper 6, automatic material distribution and collection processing of the grain material is realized. A movable sampling frame 36 is also slidably installed on the front of the receiving hopper 6, and a sampling opening is provided on one side of the top of the movable sampling frame 36. The movable sampling frame 36 is located inside the receiving hopper 6 and is arranged in a drawer-like manner, for sliding the grain material that enters the movable sampling frame 36 out of the receiving hopper 6 to obtain the corresponding grain material sample.

[0027] It should be noted that the negative pressure pump 2 provides the negative pressure power required for the material distribution operation to the inside of the material distribution equipment box 1 through the negative pressure air guide pipe 9. The grain material mixed with air is sent into the feed tank 5 through the feed pipe 10 and then into the mixing tank 7. The mixing section performs uniform mixing treatment on the fed grain material. The mixed material enters the material distribution section above the receiving hopper 6 for uniform distribution. Part of the distributed material enters the corresponding number of material collection structures inside the receiving hopper 6 and is finally transported to the sample collector 4 to complete the sample collection. The excess material is transported to the material bin 3 for recycling and storage. At the same time, the grain material sample inside the active sampling frame 36 can be directly obtained by sliding out the drawer-type active sampling frame 36 inside the receiving hopper 6.

[0028] The entire process of material conveying and processing is achieved through negative pressure power, effectively avoiding dust pollution and material loss during the distribution of grain materials. At the same time, the functions of mixing, distributing, collecting, recycling and manual sampling are integrated inside the distributing equipment box 1, realizing the integrated operation of multiple processes. The number of sample collectors 4 can be flexibly adjusted according to actual sampling needs, adapting to different batches and different precision requirements of grain material sampling operations. The drawer-type movable sampling frame 36 design allows for quick manual sampling without stopping the machine, greatly improving the convenience and flexibility of sampling operations.

[0029] Example 2:

[0030] like Figure 3 and Figure 4 As shown, the negative pressure control unit includes a negative pressure control frame 8 fixedly installed on one side of the inner wall of the material distribution equipment box 1. The front of the negative pressure control frame 8 is connected to one end of the negative pressure air guide pipe 9. The top ends of several material distribution negative pressure pipes 12 extend into the interior of the negative pressure control frame 8. The top of the negative pressure control frame 8 is fixedly provided with a number of control cylinders 14 corresponding to the material distribution negative pressure pipes 12, and the drive end of each control cylinder 14 extends into the interior of the negative pressure control frame 8. The drive end of each control cylinder 14 is fixedly provided with a control valve 15. The control valve 15 provided at the drive end of the control cylinder 14 controls the top end of the corresponding material distribution negative pressure pipe 12 to achieve closed control of the top end of the material distribution negative pressure pipe 12.

[0031] A main negative pressure pipe 11 is fixedly installed on the rear side of the negative pressure control frame 8. One end of the main negative pressure pipe 11 extends to the upper part of the material distribution equipment box 1, and the other end of the main negative pressure pipe 11 is fixedly connected to the top of the feed tank 5. A filter frame 18 is fixedly installed on the upper part of the feed tank 5, and the top of the filter frame 18 is connected to the interior of the main negative pressure pipe 11. A backflushing interface 13 is also fixedly installed on the end of the main negative pressure pipe 11 near the feed tank 5. Backflushing air is introduced into the filter frame 18 installed inside the feed tank 5 to clean the light material adsorbed on the bottom surface of the filter frame 18, so as to ensure the dust suction effect of the filter frame 18 when mixing and distributing grain materials.

[0032] Furthermore, a material recovery pipe 34 is fixedly installed at the bottom of the receiving hopper 6, and a material recovery port is provided at the top of the material recovery pipe 34. A screw conveyor frame 35 is rotatably installed inside the material recovery pipe 34, and a drive motor for driving the screw conveyor frame 35 to rotate is provided at one end of the material recovery pipe 34. A material conveying pipe is also provided at one end of the material recovery pipe 34, and one end of the material conveying pipe is connected to the inside of the material bin 3. Through the material recovery pipe 34 and the screw conveyor frame 35 installed inside, the grain material inside the receiving hopper 6 is sent back to the inside of the material bin 3 with the material conveying pipe, realizing the automatic recycling and processing of grain material.

[0033] It should be noted that the negative pressure generated by the negative pressure pump 2 is transported to the inside of the negative pressure control frame 8 through the negative pressure air guide pipe 9. The control cylinder 14 set on the negative pressure control frame 8 for each material distribution negative pressure pipe 12 drives the control valve 15 to rise and fall. The control valve 15 is connected to the top of the material distribution negative pressure pipe 12 to realize the on-off control of the corresponding pipeline, thereby providing independent negative pressure power for the material recovery of the material bin 3 and the sample collection of the sample collector 4. The main negative pressure pipeline 11 transports the negative pressure of the negative pressure control frame 8 to the top of the feed tank 5. The filter frame 18 inside the feed tank 5 filters and intercepts the grain material mixed in the air to prevent the material from entering the negative pressure pipeline and causing blockage. The backflushing interface 13 can periodically introduce backflushing air to clean the light material adsorbed on the bottom surface of the filter frame 18. The material recovery pipe 34 at the bottom of the receiving hopper 6 transports the remaining material in the receiving hopper 6 back to the material bin 3 through the material conveying pipe via the internal spiral conveying frame 35 driven by the drive motor.

[0034] By adopting an independent pipeline on / off control method with cylinder-driven control valves, precise and independent regulation of negative pressure circuits with different functions is achieved, avoiding negative pressure interference between multiple pipelines and ensuring the stability of material conveying and material collection processes. The filter frame 18, in conjunction with the self-cleaning design of the backflushing interface 13, can continuously maintain filtration efficiency and effectively extend the continuous operation time of the equipment. The material recovery method of the screw conveyor frame 35 solves the problems of material residue and blockage that are easy to occur in traditional gravity recovery, realizes full automatic recovery of remaining materials, greatly reduces material waste, and improves the automation level of the equipment.

[0035] Example 3:

[0036] like Figure 3 , Figures 6-9 As shown, the mixing section includes a material distribution rack 20 fixedly installed inside the mixing tank 7 and a fixed guide rack 28 fixedly installed at the bottom of the mixing tank 7. A movable baffle 27 is provided on one side of the bottom of the fixed guide rack 28 via a hinge. When a negative pressure is generated inside the feed tank 5 through the main negative pressure pipe 11, one side of the movable baffle 27 is negatively attracted to the bottom of the fixed guide rack 28, thereby sealing the bottom of the fixed guide rack 28.

[0037] Furthermore, a feeding rack 19 is fixedly installed at one end of the feeding pipe 10 extending into the feed tank 5, and both the upper and lower ends of the feeding rack 19 are open; the top of the distributing rack 20 is provided with a conical platform, and several distributing channels 21 are provided around the distributing rack 20, with through holes at the bottom of each of the several distributing channels 21; a fixed mixing rack 22 is fixedly installed at the bottom of the distributing rack 20, and several fixed partitions 23 are fixedly installed on the outer circumference of the fixed mixing rack 22; the several fixed partitions 23 divide the fixed mixing rack 22 and the mixing tank 7 into several mixing chambers, and the number of distributing channels 21 corresponding to the top of each mixing chamber is the same; The bottom of the fixed mixing rack 22 is also rotatably equipped with a rotating feeding rack 24, and both sides of the rotating feeding rack 24 are provided with feeding channels 25. The interior of the fixed mixing rack 22 is also fixedly equipped with a rotating servo motor 26, and the output end of the rotating servo motor 26 is fixedly connected to the interior of the rotating feeding rack 24. The output shaft of the rotating servo motor 26 controls the rotating feeding rack 24 to rotate at a uniform speed at the bottom of the fixed mixing rack 22, so that the feeding channels 25 slide at a uniform speed at the bottom of each mixing chamber. The feeding channels 25 are used to discharge the uniformly mixed material inside the mixing chamber, thereby ensuring the uniformity of the sampling of grain materials.

[0038] It should be noted that the conical platform at the top of the material distribution rack 20 evenly distributes the grain material fed into the feeding rack 19. The first grain material is evenly distributed through several material distribution channels 21 around the material distribution rack 20 and falls into the mixing chamber inside each fixed mixing rack 22. Then, the second grain material and the third grain material are fed in until all the grain material is fed. Each grain material is evenly mixed and stored inside each mixing chamber. With the subsequent even rotation of the discharge rack 24, the mixed grain material is fed into the fixed guide rack 28 through the discharge channel 25.

[0039] It should also be noted that when the main negative pressure pipeline 11 generates negative pressure inside the feed tank 5, the movable baffle 27 is attracted and adhered to the bottom of the fixed guide frame 28 by the negative pressure, thereby sealing the bottom of the fixed guide frame 28. After the grain material is fed into the feed tank 5 through the feed frame 19, it first impacts the conical platform at the top of the distribution frame 20. After being evenly dispersed, it enters each mixing chamber separated by the fixed partition 23 through several distribution channels 21 around the distribution frame 20. Multiple streams of continuously fed grain material are sequentially mixed and stored in each mixing chamber. After the mixing is completed, the rotating servo motor 26 drives the rotating discharge frame 24 to rotate at a constant speed at the bottom of the fixed mixing frame 22. The discharge channel 25 on the rotating discharge frame 24 sequentially passes through the bottom of each mixing chamber, evenly discharging the mixed material in each mixing chamber into the fixed guide frame 28.

[0040] By combining layered mixing with uniformly rotating feeding, the problem of traditional stirring mixing that easily damages the integrity of grain particles and results in uneven mixing is solved. The conical platform of the distribution rack 20 and the distribution channel 21 can evenly distribute each batch of material into all mixing chambers, ensuring the consistency of material distribution in each mixing chamber for different batches. The uniformly rotating feeding method of the rotating feeding rack 24 can perform a second homogenization process on the layered mixed material, which greatly improves the uniformity of the final output material. At the same time, the negative pressure adsorption closed design of the movable baffle 27 does not require an additional drive mechanism, and the structure is simple and reliable, effectively reducing the failure rate and maintenance cost of the equipment.

[0041] Example 4:

[0042] like Figure 7 , Figures 9-11 As shown, the material distribution unit includes a hopper 16 fixedly mounted below the fixed guide frame 28 via a connector, and a rotating connecting seat 31 rotatably mounted at the bottom of the hopper 16. A rotary cylinder 29 is fixedly mounted on one side of the bottom of the hopper 16, and the output end of the rotary cylinder 29 is fixedly mounted on the rotating connecting seat 31. A control groove is provided on one side inside the rotating connecting seat 31, and the control groove on one side of the top of the rotating connecting seat 31 is slidably connected inside. Several material distribution pipes 32 are fixedly mounted around the bottom of the rotating connecting seat 31, and the inner part of the receiving hopper 6... The unit is also fixedly equipped with several material distribution and collection frames 33, and at least two material distribution pipes 32 are provided. The bottom end of one material distribution pipe 32 is located directly above the movable sampling frame 36, and the bottom ends of the other material distribution pipes 32 are respectively located directly above the corresponding material distribution and collection frame 33. The output shaft of the rotary cylinder 29, in conjunction with the rotary connecting seat 31, controls the rotary sleeve 30 to rotate at a certain angle, so that the two material distribution pipes 32 are respectively deflected directly above the movable sampling frame 36 and the material distribution and collection frame 33. At this time, the grain material is sent into the interior of the receiving hopper 6 through the two material distribution pipes 32.

[0043] Furthermore, a connecting stirring frame 37 is fixedly provided at the middle of the bottom of the rotating sleeve 30, and the bottom of the connecting stirring frame 37 slides in contact with the inner surface of the receiving hopper 6; through the synchronous rotation between the connecting stirring frame 37 and the rotating sleeve 30, the grain material inside the receiving hopper 6 is stirred to prevent the grain material from being blocked inside the receiving hopper 6, and the grain material is recovered and transported in conjunction with the spiral conveyor frame 35 set inside the material recovery pipe 34.

[0044] It should be noted that the uniformly mixed grain material falls into the hopper 16 through the fixed guide frame 28. The rotary cylinder 29 drives the rotating connecting seat 31 to rotate the rotating sleeve 30 by a preset angle, so that each of the distributing pipes 32 at the bottom of the rotating sleeve 30 is aligned with the movable sampling frame 36 and the corresponding number of distributing collection frames 33. The material flows into the movable sampling frame 36 and the distributing collection frame 33 through the distributing pipes 32. The material in the distributing collection frame 33 is finally transported to the sample collector 4 to complete the sampling. At the same time, the rotating sleeve 30 drives the bottom connecting stirring frame 37 to rotate synchronously. The bottom of the connecting stirring frame 37 slides in contact with the inner surface of the receiving hopper 6, continuously stirring the material inside the receiving hopper 6.

[0045] By adopting a rotary cylinder-driven rotating material distribution method, the discharge position of each material distribution pipe 32 can be precisely controlled, enabling rapid switching and distribution of materials between different collection containers. The material distribution accuracy is high and the response speed is fast, effectively avoiding cross-contamination of materials during the material distribution process. The synchronous rotation design connecting the stirring frame 37 and the rotating sleeve 30 eliminates the need for an additional stirring drive mechanism to achieve continuous stirring of materials inside the receiving hopper 6, completely solving the problem of grain materials accumulating and clogging at the bottom of the receiving hopper 6, ensuring the smoothness of the material recycling process, while simplifying the overall structure of the equipment and reducing the manufacturing cost and operating energy consumption of the equipment.

[0046] The working principle of the negative pressure mixing and dispensing device is as follows: Step 1: Install the corresponding number of sample collectors 4 according to the actual material sampling requirements. After checking the sealing of all pipeline connections and structural components, start the negative pressure pump 2. The negative pressure pump 2 provides the negative pressure power required for the material sorting operation to the inside of the material sorting equipment box 1 through the negative pressure air guide pipe 9.

[0047] Step 2: The negative pressure generated by the negative pressure pump 2 is transported to the inside of the negative pressure control frame 8 through the negative pressure air guide pipe 9, and then transported to the top of the feed tank 5 through the main negative pressure pipe 11. The movable baffle 27 at the bottom of the mixing tank 7 is adsorbed and attached to the bottom of the fixed guide frame 28 by the negative pressure, thereby closing the material discharge channel of the fixed guide frame 28. At the same time, the filter frame 18 inside the feed tank 5 begins to filter and intercept the material in the air entering the main negative pressure pipe 11.

[0048] Step 3: The grain material to be processed is mixed with air and fed into the feed tank 5 through the feed pipe 10. Then, it falls vertically through the bottom opening of the feed rack 19 and hits the conical platform at the top of the distribution rack 20. After being evenly dispersed by the conical platform, it falls into each mixing chamber formed by the fixed partition 23 through several distribution channels 21 around the distribution rack 20.

[0049] Step 4: The grain materials continuously fed in from multiple streams repeat the material distribution process of Step 3, and are layered and mixed in each mixing chamber until all the grain materials to be processed are sent into the mixing tank 7 and the layered mixing operation is completed.

[0050] Step 5: Start the rotating servo motor 26 inside the fixed mixing rack 22. The output shaft of the rotating servo motor 26 drives the rotating feeding rack 24 to rotate at a constant speed at the bottom of the fixed mixing rack 22. The feeding groove 25 on the rotating feeding rack 24 slides through the bottom of each mixing chamber in sequence.

[0051] Step 6: The material discharge channel 25 evenly discharges the layered mixed material in each mixing chamber into the fixed guide frame 28. The gravity of the material overcomes the negative pressure adsorption force and pushes the movable baffle 27 to rotate around the hinge and open, so that the evenly mixed grain material falls smoothly into the discharge hopper 16 below.

[0052] Step 7: Start the rotary cylinder 29 according to the preset material sampling parameters. The output shaft of the rotary cylinder 29 drives the rotating connecting seat 31 to rotate the rotating sleeve 30 by a preset angle, so that the corresponding material dispensing tube 32 at the bottom of the rotating sleeve 30 is aligned with the movable sampling frame 36 and the corresponding number of material collection frames 33 respectively.

[0053] Step 8: The grain material inside the hopper 16 flows into the movable sampling frame 36 and the material collection frame 33 through the rotating sleeve 30 and the material distribution pipe 32 respectively. The material flowing into the material collection frame 33 is transported to the sample collector 4 under the negative pressure provided by the corresponding material distribution negative pressure pipe 12 to complete the automatic sample collection.

[0054] Step 9: When manual sampling is required, simply slide the movable sampling frame 36, which is a drawer-type structure inside the receiving hopper 6, horizontally to quickly obtain the grain material sample stored inside the movable sampling frame 36. After the sampling is completed, push the movable sampling frame 36 back into the receiving hopper 6 to resume normal operation.

[0055] Step 10: During the entire process of material distribution and subsequent material recycling, the rotating sleeve 30 drives the bottom connecting mixing frame 37 to rotate synchronously. The bottom of the connecting mixing frame 37 slides in contact with the inner surface of the receiving hopper 6, continuously stirring the grain material inside the receiving hopper 6 to prevent the material from accumulating and clogging at the bottom of the receiving hopper 6.

[0056] Step 11: After the material sampling operation is completed, the control cylinder 14 on the negative pressure control frame 8 drives the control valve 15 to descend and open the passage of the corresponding material negative pressure pipe 12, providing negative pressure power for the material recovery pipeline.

[0057] Step 12: Start the drive motor at one end of the material recovery pipe 34. The drive motor drives the screw conveyor frame 35 to rotate inside the material recovery pipe 34, and transports the remaining grain material inside the receiving hopper 6 back to the material bin 3 through the material conveying pipe, thus completing the automatic recycling of the remaining material.

[0058] Step 13: When the equipment has been running continuously for a preset time or the filtration efficiency of the filter frame 18 has decreased, turn off the negative pressure pump 2 and introduce high-pressure backflushing air through the backflushing interface 13 on the main negative pressure pipeline 11 to blow and clean the bottom surface of the filter frame 18, remove the adsorbed light materials and dust, and restore the normal filtration performance of the filter frame 18.

[0059] In summary, the proposed solution is mainly used to address the following technical problems in existing grain material sampling and distribution equipment: gravity-type sampling has poor uniformity, which can easily lead to particle stratification and dust pollution; negative pressure sampling equipment uses stirring blades, which can easily damage the integrity of grain particles and has insufficient mixing uniformity; multiple negative pressure pipelines cannot be independently and accurately controlled, which can easily cause negative pressure interference; manual sampling cannot be completed quickly without stopping the machine; and materials can easily accumulate and block at the receiving point, resulting in low continuous operation capability and low reliability of the equipment.

[0060] The ingenuity of this application lies in the layered mixing structure inside the mixing tank 7, consisting of a distribution rack 20, a fixed mixing rack 22, and a rotating discharge rack 24. This structure evenly distributes each feed of material into multiple independent mixing chambers to form layered mixing. Uniform feeding is then achieved through a uniformly rotating discharge chute 25, significantly improving mixing uniformity without damaging the grain particles. Furthermore, by installing control cylinders 14 and control valves 15 on the negative pressure control frame 8, corresponding one-to-one with the distribution negative pressure pipes 12, independent on / off control of each negative pressure pipe is achieved, completely avoiding negative pressure interference between different functional pipes. Finally, the rotating sleeve 30 is driven by a rotating cylinder 29. The rotating material distribution pipe 32 enables precise and rapid switching and distribution of materials between different collection containers. Simultaneously, the rotating sleeve 30 synchronously drives the connecting mixing frame 37 to rotate, preventing material accumulation and blockage inside the receiving hopper 6 without the need for an additional drive mechanism. By setting a drawer-type movable sampling frame 36 inside the receiving hopper 6, rapid manual sampling can be achieved without stopping the machine. Combined with the self-cleaning design of the filter frame 18 with backflushing interface 13 and the full material recovery design of the spiral conveyor frame 35 inside the material recovery pipe 34, the continuous operation time of the equipment is effectively extended, material loss is reduced, the overall structure has a high degree of integration, and the degree of automation and operational reliability are significantly improved.

[0061] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A negative pressure mixing and distributing device for grain material sampling, comprising a distributing equipment box (1), a negative pressure pump (2), a material bin (3), and a sample collector (4), wherein the output end of the negative pressure pump (2) is connected to the interior of the distributing equipment box (1) through a negative pressure air guide pipe (9), and the material bin (3) and the sample collector (4) are both connected to the interior of the distributing equipment box (1) through a distributing negative pressure pipe (12), characterized in that, The upper part of the material distribution equipment box (1) is provided with a feeding tank (5) and a mixing tank (7), and the feeding tank (5) and the mixing tank (7) are fixedly connected by a flange. A feeding pipe (10) for conveying grain materials is fixedly provided on one side of the feeding tank (5). The mixing tank (7) is provided with a mixing section for uniformly distributing grain materials. A negative pressure control section is provided on one side of the material distribution equipment box (1) for providing corresponding negative pressure for mixing and distributing grain materials, material recovery in the material bin (3), and sample collection processing in the sample collector (4). The material distribution equipment box (1) is also fixedly provided with a receiving hopper (6) at the bottom, and a material distribution part is provided above the receiving hopper (6) for uniformly distributing the grain material after the mixing process is completed; a movable sampling frame (36) is also slidably provided on the front of the receiving hopper (6).

2. The negative pressure mixing and dispensing device for grain material sampling according to claim 1, characterized in that, The negative pressure control unit includes a negative pressure control frame (8) fixedly installed on one side of the inner wall of the material distribution equipment box (1), and the front of the negative pressure control frame (8) is connected to one end of the negative pressure air guide pipe (9).

3. The negative pressure mixing and dispensing device for grain material sampling according to claim 2, characterized in that, The top ends of several material distribution negative pressure pipes (12) extend into the interior of the negative pressure control frame (8). The top of the negative pressure control frame (8) is fixedly provided with a number of control cylinders (14) corresponding to the material distribution negative pressure pipes (12), and the drive end of each control cylinder (14) extends into the interior of the negative pressure control frame (8). The drive end of each control cylinder (14) is fixedly provided with a control valve (15).

4. A negative pressure mixing and dispensing device for grain material sampling according to claim 2 or 3, characterized in that, The negative pressure control frame (8) is also fixedly provided with a main negative pressure pipe (11), and one end of the main negative pressure pipe (11) extends to the top inside the material distribution equipment box (1). The other end of the main negative pressure pipe (11) is fixedly connected to the top of the feed tank (5). A filter frame (18) is fixedly provided above the inside of the feed tank (5), and the top of the filter frame (18) is connected to the inside of the main negative pressure pipe (11). A backflushing interface (13) is also fixedly provided at the end of the main negative pressure pipe (11) near the feed tank (5).

5. A negative pressure mixing and dispensing device for grain material sampling according to claim 1, characterized in that, The bottom of the receiving hopper (6) is also fixedly provided with a material recovery pipe (34), and the top of the material recovery pipe (34) is provided with a material recovery port. A spiral conveyor frame (35) is rotatably provided inside the material recovery pipe (34), and one end of the material recovery pipe (34) is provided with a drive motor for driving the spiral conveyor frame (35) to rotate. One end of the material recovery pipe (34) is also provided with a material conveying pipe, and one end of the material conveying pipe is connected to the inside of the material bin (3).

6. A negative pressure mixing and dispensing device for grain material sampling according to claim 1, characterized in that, The mixing section includes a material distribution rack (20) fixedly installed inside the mixing tank (7) and a fixed guide rack (28) fixedly installed at the bottom of the mixing tank (7). A movable baffle (27) is provided on one side of the bottom of the fixed guide rack (28) via a hinge.

7. A negative pressure mixing and dispensing device for grain material sampling according to claim 6, characterized in that, The feeding pipe (10) extends into the feed tank (5) and is fixedly provided with a feeding rack (19), and the upper and lower ends of the feeding rack (19) are both open; the top of the distribution rack (20) is provided with a conical platform, and the distribution rack (20) is provided with several distribution channels (21) around its perimeter, and the bottom of the several distribution channels (21) is provided with through holes; the bottom of the distribution rack (20) is fixedly provided with a fixed mixing rack (22), and the outer periphery of the fixed mixing rack (22) is fixedly provided with several fixed partitions (23); the several fixed partitions (23) divide the fixed mixing rack (22) and the mixing tank (7) into several mixing chambers, and the number of corresponding distribution channels (21) at the top of each mixing chamber is the same.

8. A negative pressure mixing and dispensing device for grain material sampling according to claim 7, characterized in that, The bottom of the fixed mixing rack (22) is also provided with a rotating feeding rack (24), and both sides of the rotating feeding rack (24) are provided with feeding channels (25). The interior of the fixed mixing rack (22) is also provided with a rotating servo motor (26), and the output end of the rotating servo motor (26) is fixedly connected to the interior of the rotating feeding rack (24).

9. A negative pressure mixing and dispensing device for grain material sampling according to claim 6, characterized in that, The material distribution section includes a dropping hopper (16) fixedly installed below the fixed guide frame (28) via a connector and a rotating connecting seat (31) rotatably installed at the bottom of the dropping hopper (16). A rotary cylinder (29) is fixedly installed on one side of the bottom of the dropping hopper (16), and the output end of the rotary cylinder (29) is fixedly installed with the rotating connecting seat (31). A control groove is provided on one side inside the rotating connecting seat (31), and the inside of the control groove is slidably connected on one side of the top of the rotating connecting seat (31). Several material distribution pipes (32) are fixedly installed around the bottom of the rotating connecting seat (31), and several material distribution collection frames (33) are also fixedly installed inside the receiving hopper (6).

10. A negative pressure mixing and dispensing device for grain material sampling according to claim 9, characterized in that, At least two material distribution tubes (32) are provided. The bottom end of one material distribution tube (32) is located directly above the movable sampling frame (36), and the bottom ends of the other material distribution tubes (32) are located directly above the corresponding material collection frame (33). A connecting stirring frame (37) is fixedly provided in the middle of the bottom of the rotating sleeve (30), and the bottom of the connecting stirring frame (37) slides in contact with the inner surface of the receiving hopper (6).

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