On-site grain receiving and sample splitter

Abstract

The present invention discloses an on-site grain receiving and sample dividing device, which includes a grain collecting device, a sample mixing device, a sample reduction device, a cabinet, a grain inlet pipeline, and a grain outlet pipeline. The upper part of the cabinet is connected to the grain inlet pipeline, and the lower part is connected to the grain outlet pipeline. It also includes a sample mixing and reduction driving device, a suction fan, a surplus grain collecting hopper, a grain outlet pipeline, an air outlet pipeline, and an electric control device. The sample mixing device adopts a multi-layer sample mixing device. The sample mixing device, the sample reduction device are connected to the sample mixing and reduction driving device. The grain collecting device, the multi-layer sample mixing device, the sample reduction device, and the sample mixing and reduction driving device are installed in a sealed cabinet. The grain collecting device, the multi-layer sample mixing device, and the sample reduction device are connected in sequence from top to bottom. The surplus grain collecting hopper is installed outside the cabinet. The inlet of the surplus grain collecting hopper is connected to the grain outlet pipeline, and the outlet is connected to the inlet of the suction fan through the air outlet pipeline. The outlet of the suction fan communicates with the atmosphere. The electric control device is electrically connected to the grain collecting device, the sample reduction device, and the sample mixing and reduction driving device respectively. It is particularly suitable for on-site grain receiving occasions.

Description

Technical Field

[0001] The present invention relates to the technical field of sample dividers, and particularly to a on-site grain receiving sample divider. Background Art

[0002] A grain sample divider is a commonly used sample processing device in grain or seed inspection and testing work. It mainly mixes and reduces the grain samples obtained in the sampling process to finally obtain representative sub-samples of a certain weight for subsequent inspection and testing processes. Generally, it is divided into two categories: on-site grain receiving sample division and laboratory sample division. Among them, on-site grain receiving sample division is the previous process of laboratory sample division. In the grain industry, traditional grain sample dividers generally fall into three basic forms: cross-grid sample dividers, bell tripod sample dividers, and rotary sample dividers. They mainly consist of a grain inlet hopper, a sample division device, a sub-sample hopper, etc. During sample division, the laboratory technician manually mixes the sample and loads it into the grain inlet hopper. The sample is reduced to sub-samples by the sample division device, generally 1 / 2 sub-samples. If other proportion sub-samples are needed, generally, multi-stage or multiple sample divisions are used to obtain them. The sample division process can also mix the sample to a certain extent. Existing grain sample dividers are suitable for laboratory sample division, with a small amount of samples to be processed, and it is required that there are only a small amount or no large-volume impurities in the samples. However, when receiving grain on-site, there are characteristics such as a large amount of sampled grain, a large content of large-volume impurities in the samples, a large dust content, uneven quality of multi-point sampling of the samples, a heavy sample division task, a large amount of labor, and a high labor intensity. There are many technical problems when existing grain sample dividers are used in the on-site grain receiving process. For example: the amount of samples processed is small, and it does not meet the requirement of dividing a large amount of 20 - 40 kg samples during on-site grain receiving; when receiving grain on-site, the content of large-volume impurities in the grain is high, which is easy to cause grain blockage. After grain blockage, it is not easy to be detected and difficult to clean. After grain blockage, the reduction is uneven, the representativeness of the sub-samples is poor, resulting in test errors; there is no effective mixing means, the sample mixing effect is not good, the representativeness of the sub-samples is poor, resulting in test errors; a large amount of manual operation is required, the labor intensity is high, especially for the 1 / 2 sample divider, it needs to be repeated many times to obtain smaller sub-samples, the operation is complex, and the operation efficiency is low, unable to meet the time requirements of on-site grain receiving; there is no dust removal function, and dust pollution affects the environment. Summary of the Invention

[0003] The present invention aims to solve the above technical problems. According to the characteristics of on-site grain receiving, targeted technical solutions are adopted to solve the technical defects of existing sample dividers, and a technical solution of an intelligent sample divider specifically for on-site grain receiving is provided. This technical solution has functions such as automatic sample collection, automatic mixing, automatic weighing, intelligent determination of the reduction ratio, and automatic dust removal. When used for on-site grain receiving sample division, it has the advantages of full-automatic operation, high working efficiency, and low labor intensity. It can reduce sub-samples of a specified weight for subsequent laboratory sample division and testing operations. The sub-samples are uniform and have strong representativeness. At the same time, it can avoid dust pollution and improve the working environment.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A on-site grain receiving and sampling divider, comprising a grain collecting device, a mixing device, a reduction and division device, a cabinet body, a grain inlet pipeline, and a grain outlet pipeline. The upper part of the cabinet body is connected to the grain inlet pipeline, and the lower part is connected to the grain outlet pipeline. It also includes a mixing and reduction driving device, a suction fan, a surplus grain collecting hopper, a grain outlet pipeline, an air outlet pipeline, a suction fan, and an electric control device. The mixing device adopts a multi-layer mixing device. The mixing device, the reduction and division device are connected to the mixing and reduction driving device. The grain collecting device, the multi-layer mixing device, the reduction and division device, and the mixing and reduction driving device are installed in the sealed cabinet body. The grain collecting device, the multi-layer mixing device, and the reduction and division device are connected in sequence from top to bottom. The surplus grain collecting hopper is installed outside the cabinet body. The inlet of the surplus grain collecting hopper is connected to the grain outlet pipeline, and the outlet is connected to the inlet of the suction fan through the air outlet pipeline. The outlet of the suction fan is open to the atmosphere. The electric control device is electrically connected to the grain collecting device, the reduction and division device, and the mixing and reduction driving device respectively.

[0006] The grain collecting device includes an upper grain collecting cylinder, a lower grain collecting conical hopper, an elastic mechanism, an inner cone, a connecting rod, a grain blocking device, a weighing sensor, a slip ring, and a grain collecting rotating device. The upper grain collecting cylinder is a cylindrical cylinder without a bottom, and the lower part is nested in the lower grain collecting conical hopper. The inner cone is arranged in the upper grain collecting cylinder and the lower grain collecting conical hopper, and is connected to the inner wall of the upper grain collecting cylinder through a connecting rod. The inner cone, the upper grain collecting cylinder, and the lower grain collecting conical hopper are connected as a whole. A cavity is formed between the inner cone and the inner walls of the upper grain collecting cylinder and the lower grain collecting conical hopper for accommodating the grain from the grain inlet pipeline. A circular grain outlet is provided at the lower part of the inner cone. The grain blocking device cooperates with the outlet of the lower grain collecting conical hopper. A weighing sensor is provided on the grain collecting device. The upper grain collecting cylinder is connected to the lower grain collecting conical hopper through an elastic mechanism, and the upper grain collecting cylinder can be adjusted in the axial height position relative to the lower grain collecting conical hopper. The outer ring of the slip ring is connected to the fixed seat of the grain collecting motor reducer of the grain collecting device, and the inner ring is fixedly connected to the rotating shaft of the grain collecting device. The outer ring wire is electrically connected to the electric control device, and the inner ring wire is electrically connected to the electric push rod of the grain blocking device.

[0007] The grain collecting rotating device includes a grain collecting motor reducer, a fixed seat of the grain collecting motor reducer, a rotating shaft, and a thrust bearing. The grain collecting motor reducer is installed on the fixed seat of the grain collecting motor reducer, and the grain collecting motor reducer is connected to the upper end of the rotating shaft. The thrust bearing is installed on the fixed seat of the grain collecting motor reducer, and the upper end of the rotating shaft is connected to the thrust bearing in a matching manner. The rotating shaft passes through the bearing and the lower end is connected to the inner cone. The grain collecting motor reducer is electrically connected to the controller of the electric control device.

[0008] The grain blocking device includes a support frame, a grain blocking plate, and an electric push rod. The support frame is fixedly connected to the lower part of the lower grain collecting hopper. A slideway is provided on the support frame. The electric push rod is connected to the support frame. The grain blocking plate is installed at the outlet position of the lower grain collecting hopper and can move on the slideway. One end of the electric push rod is fixed to the lower part of the lower grain collecting hopper, and the other end is connected to the grain blocking plate. The electric push rod is electrically connected to the electric control device through a slip ring wire.

[0009] The multi-layer mixing device includes multiple groups of mixing modules, which are coaxially arranged from top to bottom. Each group of mixing modules includes a conical hopper, a conical hopper fixing seat, a mixing and reducing rotating disk, and a guiding plate. An outlet is provided at the lower part of the conical hopper. The outer wall of the conical hopper is connected to the conical hopper fixing seat. One end of the conical hopper fixing seat is connected to the cabinet body. The mixing and reducing rotating disk is located inside the conical hopper and is coaxially arranged with the conical hopper. A uniform annular space is formed between the outer edge of the mixing and reducing rotating disk and the inner wall of the conical hopper.

[0010] Multiple guiding plates are provided on the inner wall of the conical hopper. The reverse sides of the multiple guiding plates are fixed in the middle of the inner wall of the conical hopper at uniform angular intervals, dividing the annular space inside the conical hopper into multiple semi-closed spaces with the same angle.

[0011] Each mixing and reducing rotating disk is installed at different height positions on the mixing and reducing rotating shaft of the mixing and reducing driving device. The mixing and reducing rotating shaft passes through the shaft holes of each mixing and reducing rotating disk and operates under the drive of the mixing and reducing motor reducer, driving each mixing and reducing rotating disk to rotate.

[0012] The mixing and reducing rotating disk includes a central disk surface and an outer disk surface of the mixing and reducing rotating disk that are connected. The reducing rotating disk includes a central disk surface and an outer disk surface of the reducing rotating disk that are connected. The central disk surfaces of the mixing and reducing rotating disk and the reducing rotating disk are flat structures, and the outer disk surfaces of the mixing and reducing rotating disk and the reducing rotating disk are arc-shaped structures. The central disk surfaces of the mixing and reducing rotating disk and the reducing rotating disk are connected to the mixing and reducing rotating shaft of the mixing and reducing driving device.

[0013] The guiding plate adopts a curved structure with small ends and a large center, and the transverse section is a hyperbolic structure.

[0014] The riffling device includes a standard cylinder, a riffling device fixing seat, a surplus grain hopper, a sample hopper, a riffling rotating disk, a riffling ratio adjusting device, and a sample bucket; the standard cylinder is cylindrical, the upper part of the standard cylinder is connected to the riffling device fixing seat, and the lower part is fixedly connected to the surplus grain hopper and the sample hopper respectively. The riffling rotating disk is arranged inside the standard cylinder, the disk surface is lower than the upper edge of the standard cylinder, and is coaxially arranged with the standard cylinder. The riffling rotating disk is connected to the riffling rotation shaft of the sample mixing and riffling driving device; the riffling ratio adjusting device is arranged inside the standard cylinder and is respectively connected to the upper edges of the surplus grain hopper and the sample hopper. The riffling ratio adjusting device divides the standard cylinder into multiple fan-shaped areas with adjustable angles. The fan-shaped areas include a surplus grain area and a sample area. The surplus grain area is flexibly connected to the surplus grain hopper, and the sample area is flexibly connected to the sample hopper; the sample bucket is placed below the outlet of each sample hopper for receiving samples from the sample hopper.

[0015] The reduction ratio adjustment device includes a reduction ratio adjustment motor reducer, a driving bevel gear, a driven bevel gear, a rotating seat, a fixed circular plate, bearings, a shaft tube, a motor fixing seat, a fixed partition plate, an adjustable partition plate, a rubber sealing plate, and a locking nut; the reduction ratio adjustment motor reducer is connected to the motor fixing seat, the output shaft of the reduction ratio adjustment motor reducer is connected to the driving bevel gear, the driving bevel gear meshes with the upper and lower driven bevel gears respectively, the outer rings of the hubs of the two driven bevel gears are in interference fit with the inner hole of the rotating seat and are fastened with set screw studs, the inner holes of the hubs are coaxial with the shaft tube and are in interference fit with the outer rings of one bearing at this position respectively; the inner tube of the rotating seat is coaxial with the shaft tube and is in interference fit with the outer rings of one bearing at this position respectively, and the outer wall of the rotating seat is connected to the adjustable partition plate; the mixing and reduction rotating shaft penetrates through the inner hole of the shaft tube with sufficient clearance in the middle, an annular groove is provided at the upper end of the shaft tube, a circlip is embedded to fix bearing I, and an external thread is provided at the lower end of the shaft tube and is connected to the internal thread of the locking nut; the shaft tube is connected in a transitional manner from top to bottom with the upper rotating seat, the upper driven bevel gear, the motor fixing seat, the lower driven bevel gear, the lower rotating seat, and the fixed circular plate, and is in interference fit with bearings I, II, III, and IV; the lower surface of the fixed circular plate is fixedly connected to the upper edges of the inner surfaces of the surplus grain hopper and the sample hopper, the upper surface is connected to the lower edge of the inner ring of bearing IV through a gasket, and a gap is left between the fixed circular plate and the lower rotating seat; there are two fixed partition plates, the lower edges of the fixed partition plates are connected to the midlines of the two adjacent sample hoppers, the inner sides are close to the outer wall of the rotating seat, and the outer sides are connected to the inner wall of the standard cylinder; there are multiple adjustable partition plates, which are divided into two groups and are arranged in a cross layout by group, one group of adjustable partition plates is connected to the upper rotating seat, and the other group is connected to the lower rotating seat; the upper part of the rubber sealing plate is symmetrically fixed in a V shape on both sides of the adjustable partition plate, the lower part covers above the boundary line between the sample hopper and the surplus grain hopper, the inner side is closely attached to the outer wall of the rotating seat, and the outer side is closely attached to the inner wall of the standard cylinder. The rubber sealing plate and the adjustable partition plate jointly separate the grains; the fixed partition plate and the adjustable partition plates on both sides of it jointly form a set of two sample falling areas with the same angle, and the angle can be adjusted according to the reduction ratio; the reduction ratio adjustment motor reducer is electrically connected to the controller of the electric control device and adjusts the angle of the partition plate according to the electrical signal to control the angle ratio of the sample area in the radial section of the entire standard cylinder, that is, the reduction ratio.

[0016] The mixing and sample reduction driving device includes a mixing and sample reduction motor reducer, a fixing seat for the mixing and sample reduction motor reducer, bearings, a mixing and sample reduction rotating shaft, a connecting plate, and a rotating shaft fixing seat. The mixing and sample reduction motor reducer is connected to the fixing seat for the mixing and sample reduction motor reducer. The power output end of the mixing and sample reduction motor reducer is connected to the lower end of the mixing and sample reduction rotating shaft. The fixing seat for the mixing and sample reduction motor reducer is connected to the bottom plate of the cabinet. The bearing at the lower end is embedded in the fixing seat for the mixing and sample reduction motor reducer, with its inner ring in interference connection with the lower part of the mixing and sample reduction rotating shaft and its outer ring in interference connection with the fixing seat for the mixing and sample reduction motor reducer. The bearing at the upper end is embedded in the rotating shaft fixing seat for the mixing and sample reduction, with its inner ring in interference connection with the upper part of the mixing and sample reduction rotating shaft and its outer ring in interference connection with the rotating shaft fixing seat. The rotating shaft fixing seat for the mixing and sample reduction is connected to the connecting plate, and the connecting plate is respectively connected to the fixing seat of the conical hopper.

[0017] The mixing and sample reduction motor reducer is electrically connected to the controller of the electric control device.

[0018] On the mixing and sample reduction rotating shaft, three mixing and sample reduction rotating disks of the mixing module and the sample reduction rotating disk of the sample reduction device are respectively connected from top to bottom. The mixing and sample reduction rotating disks and the sample reduction rotating disk are connected to the mixing and sample reduction rotating shaft of the mixing and sample reduction driving device through a key and keyway matching structure. Among them, the mixing and sample reduction rotating disk is located in the upper layer, and the sample reduction rotating disk is located in the bottom layer.

[0019] The electric control device includes a controller, a touch screen, a weighing instrument, a grain collecting speed governor, a mixing and sample reduction speed governor, and other low-voltage electrical equipment.

[0020] The controller is electrically connected to the weighing instrument and is used to detect the weight of the collected grain.

[0021] The controller is electrically connected to the grain collecting speed governor, and then to the grain collecting rotating motor, for controlling the rotating speed of the grain collecting motor. The controller is electrically connected to the mixing and sample reduction speed governor, and then to the mixing and sample reduction rotating motor, for controlling the rotating speed of the mixing and sample reduction motor.

[0022] The controller is electrically connected to the grain blocking electric push rod and is used to control the switch of the outlet of the lower grain collecting conical hopper.

[0023] The controller is electrically connected to the sample reduction ratio adjustment motor reducer and is used to control the sample reduction ratio.

[0024] The electric control device is electrically connected to the suction fan for controlling the start and stop of the fan.

[0025] The touch screen is communicatively connected to the controller and is used as the human-machine interface of the system; through the touch screen and the controller, the actions of various electrical and mechanical devices are controlled, and the required reduction ratio is calculated based on the total amount of collected grain and the set sample amount, and the mixing and reduction speed regulator is controlled to perform pre-control of the reduction ratio, and the optimal mixing speed is determined according to the grain type and the rotation speed of the mixing and reduction is adjusted.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The present invention has functions of sample collection, mixing, sub-sampling, surplus grain migration, and dust removal. Through the optimization and improvement of various parts such as grain collection, mixing, and reduction of grain, pre-mixing is carried out simultaneously during the grain collection process. After multi-stage mixing, the grain is thoroughly mixed. Finally, through the reduction process with adjustable reduction ratio, uniform sub-samples with the required weight are obtained at one time; when the present invention operates, the next grain collection process can be parallel to the mixing, sub-sampling, and surplus grain migration processes of the previous batch, with high time utilization rate, effectively improving the work efficiency, and the mixing and sub-sampling effects are also effectively guaranteed, meeting the performance indicators required by the standard; the entire operation process is automatically carried out in a sealed space, without causing dust leakage, improving the working environment. It is applicable to specific application occasions of on-site grain collection, with high automation control and work efficiency, low labor intensity, reduced dust pollution, and improved working environment.

[0028] 2. The grain collection device of the present invention includes an upper grain collection cylinder, a lower grain collection hopper, an elastic mechanism, an inner cone, a weighing sensor, and a grain collection rotating device. It adopts a new grain collection technology with functions such as weighing and annular layered uniform grain distribution. While realizing grain collection, primary mixing is achieved through annular layered uniform grain distribution, and the maximum number of layers can reach hundreds of layers, with remarkable mixing effect; it can automatically detect the total amount of grain collection and calculate the reduction ratio according to the sub-sample amount requirement for subsequent sub-sampling control.

[0029] 3. The multi-stage mixing device of the present invention includes multiple groups of mixing modules. The multiple groups of mixing modules are coaxially arranged from top to bottom. Each group of mixing modules includes a conical hopper, a conical hopper fixing seat, a mixing and reduction rotating disk, and a flow guide plate. A uniform annular space is formed between the outer edge of the mixing and reduction rotating disk and the inner wall of the conical hopper; multiple flow guide plates are provided on the inner wall of the conical hopper, and the reverse sides of the multiple flow guide plates are fixed in the middle of the inner wall of the conical hopper at uniform interval angles, dividing the annular space in the conical hopper into multiple semi-closed spaces with the same angle; each of the mixing and reduction rotating disks is installed at different height positions on the mixing and reduction rotating shaft of the mixing and reduction driving device; measures such as rotary equalization, partition flow guiding, collision mixing sequence, and constraint gathering are applied to achieve multi-stage mixing of grain, which can perform continuous mixing treatment on grain, without blockage, without material storage, with complete samples, and good mixing effect.

[0030] 4. The sample divider of the present invention includes a standard cylinder, a sample divider fixing base, a surplus grain hopper, a sample hopper, a sample dividing rotating disk, a sample dividing ratio adjusting device, and a sample bucket. By applying angle control technology, it automatically calculates and controls the sample dividing ratio according to the total incoming grain volume, ensuring automatic sample division within the entire sample range according to the sub-sample volume requirements, being able to divide out the sub-sample volume required for subsequent tests according to the amount of incoming grain, and being able to generate multiple sub-samples simultaneously, meeting the business requirements such as chemical analysis, sample retention, and re-inspection at the same time.

[0031] 5. The surplus grain collection hopper of the present invention can automatically transfer surplus grain by using a blower under the control of an electric control device, reducing manual handling.

[0032] 6. The mixing and sample dividing of the present invention have good quality, fully ensuring the representativeness of sub-samples, being able to quickly process a large number of grain samples, and being applicable to application scenarios such as on-site grain collection that require the processing of a large amount of grain.

[0033] 7. The electric control device of the present invention is electrically connected to the grain collection device, the sample divider, and the mixing and sample dividing drive device respectively. Adopting a modular process design and being directly connected to the incoming grain pipeline of the sampling machine, its automated operations such as grain collection, mixing, sample dividing, and surplus grain transfer can be carried out sequentially. When collecting the next batch of samples, the mixing, sample dividing, and surplus grain transfer operations of the previous batch of samples can be carried out synchronously, saving a lot of time and further improving work efficiency.

[0034] 8. The grain collection device, multi-layer mixing device, sample divider, and mixing and sample dividing drive device of the present invention are installed in a sealed cabinet. With a sealed design, all devices are completely sealed, avoiding dust leakage and pollution and improving the working environment.

[0035] 9. The electric control device of the present invention includes a controller, a touch screen, a weighing instrument, a grain collection speed regulator, and a mixing and sample dividing speed regulator, and can achieve intelligent and automatic control. When in use, the operator only needs to simply perform screen touch operations, and other control and adjustment functions are completed automatically by the system. The automation program can adapt to the intelligent sampling requirements of different grain types, different vehicle types, and different sub-sample volume requirements, with simple and convenient operation and low labor intensity. Brief Description of the Drawings

[0036] Figure 1 is the structural schematic diagram of the present invention;

[0037] Figure 2 is the structural schematic diagram of the grain collection device 1 of the present invention;

[0038] Figure 3 is the structural schematic diagram of the grain collection rotating device 1-9 of the present invention;

[0039] Figure 4 is the cross-sectional view of the grain collection rotating device 1-9 of the present invention;

[0040] Figure 5 It is a schematic structural diagram of the grain-blocking device 1-6 of the present invention;

[0041] Figure 6 It is a schematic structural diagram of the multi-layer sample mixing device 2 of the present invention;

[0042] Figure 7 It is a sectional view of the multi-layer sample mixing device 2 of the present invention;

[0043] Figure 8 It is a schematic structural diagram of the sample reduction device 3 of the present invention;

[0044] Figure 9 It is a schematic diagram of the internal structure of the sample reduction device 3 of the present invention;

[0045] Figure 10 It is a schematic structural diagram of the sample reduction ratio adjustment device 3-6 of the present invention;

[0046] Figure 11 It is a sectional view of the sample reduction ratio adjustment device 3-6 of the present invention;

[0047] Figure 12 It is a schematic structural diagram of the sample mixing and reduction driving device 4 of the present invention;

[0048] Figure 13 It is a sectional view of the sample mixing and reduction driving device 4 of the present invention;

[0049] Figure 14 It is a sectional view of the sample mixing and reduction rotating disk 2-3 of the present invention;

[0050] Figure 15 It is a sectional view of the sample reduction rotating disk 3-5 of the present invention;

[0051] Figure 16 It is a front view of the flow guide plate 2-4 of the present invention;

[0052] Figure 17 It is a side view of the flow guide plate 2-4 of the present invention;

[0053] Figure 18 It is a sectional view of the flow guide plate 2-4 of the present invention;

[0054] Figure 19 It is a schematic structural diagram of the electric control device 11 of the present invention.

[0055] 1 Grain collecting device, 1-1 upper grain collecting cylinder, 1-2 lower grain collecting hopper, 1-3 elastic suspension device, 1-4 inner cone, 1-5 connecting rod, 1-6 grain blocking device, 1-6-1 grain blocking plate, 1-6-2 slideway, 1-6-3 electric push rod, 1-6-4 support frame, 1-7 weighing sensor, 1-8 weighing sensor fixing seat, 1-9 grain collecting rotating device, 1-9-1 grain collecting motor reducer, 1-9-2 grain collecting motor reducer fixing seat, 1-9-3 rotating shaft, 1-9-4 thrust bearing, 1-10 collector ring;

[0056] 2 Multi-layer mixing device, 2-1 conical hopper, 2-2 conical hopper fixing seat, 2-3 mixing and reducing rotating disk, 2-3-1 central disk surface of the mixing and reducing rotating disk, 2-3-2 outer disk surface of the mixing and reducing rotating disk, 2-4 guide plate, 2-4-1 top of the guide plate, 2-4-2 bottom of the guide plate, 2-4-3 upper reverse of the guide plate, 2-4-4 upper positive of the guide plate, 2-4-5 lower reverse of the guide plate, 2-4-6 lower positive of the guide plate, 2-4-7 curved surface of the guide plate;

[0057] 3 Dividing device, 3-1 standard cylinder, 3-2 dividing device fixing seat, 3-3 surplus grain hopper, 3-4 sample hopper, 3-5 dividing rotating disk, 3-5-1 central disk surface of the dividing rotating disk, 3-5-2 outer disk surface of the dividing rotating disk, 3-6 dividing ratio adjusting device, 3-6-1 dividing ratio adjusting motor reducer, 3-6-2 driving bevel gear, 3-6-3 driven bevel gear, 3-6-4 rotating seat, 3-6-5 fixed circular plate, 3-6-6 bearing, 3-6-7 shaft tube, 3-6-8 motor fixing seat, 3-6-9 fixed partition plate, 3-6-10 adjustable partition plate, 3-6-11 rubber sealing plate, 3-6-12 locking nut, 3-7 sample bucket;

[0058] 4 Mixing and reducing driving device, 4-1 mixing and reducing motor reducer, 4-2 mixing and reducing motor reducer fixing seat, 4-3 bearing, 4-4 mixing and reducing rotating shaft, 4-5 connecting plate, 4-6 mixing and reducing rotating shaft fixing seat;

[0059] 5 Cabinet;

[0060] 6 Surplus grain collecting hopper;

[0061] 7 Blower;

[0062] 8 Inlet grain pipeline;

[0063] 9 Outlet grain pipeline;

[0064] 10 Outlet air pipeline;

[0065] 11 Electric control device, 11-1 controller, 11-2 touch screen, 11-3 weighing instrument, 11-4 grain collecting speed regulator, 11-5 mixing and reducing speed regulator. Detailed implementation manners

[0066] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0067] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] Combined with Figures 1-18 , a on-site grain receiving and sampling divider, comprising a grain collecting device 1, a multi-layer mixing device 2, a reduction device 3, a mixing and reduction driving device 4, a cabinet 5, a surplus grain collecting hopper 6, a suction fan 7, a feed pipe 8, a discharge pipe 9, an air outlet pipe 10, and an electric control device 11; the grain collecting device 1, the multi-layer mixing device 2, the reduction device 3, and the mixing and reduction driving device 4 are installed in the sealed cabinet 5, the grain collecting device 1, the multi-layer mixing device 2, and the reduction device 3 are connected in sequence from top to bottom and are connected to the mixing and reduction driving device 4, the cabinet 5 is designed to be sealed and is provided with a movable sealing door for convenient sample taking and maintenance, the upper part of the cabinet 5 is connected to the feed pipe 8, and the lower part is connected to the discharge pipe 9. The surplus grain collecting hopper 6 is installed outside the cabinet 5, the inlet of the surplus grain collecting hopper 6 is connected to the discharge pipe 9, and the outlet is connected to the inlet of the suction fan 7 through the air outlet pipe 10, and the outlet of the suction fan 7 communicates with the atmosphere; the electric control device 11 is respectively connected to the grain collecting device 1 and the mixing and reduction driving device 4 for detecting and controlling the system electrical instrument equipment to realize the automatic control function.

[0069] Combined with Figure 2 , the grain collecting device 1 includes an upper grain collecting cylinder 1-1, a lower grain collecting conical hopper 1-2, an elastic hanging device 1-3, an inner cone 1-4, a connecting rod 1-5, a grain blocking device 1-6, a grain collecting rotating device 1-9, and a slip ring 1-10;

[0070] The upper grain collecting cylinder 1-1 is a cylindrical cylinder without a bottom, and the lower part is nested in the lower grain collecting conical hopper 1-2. The inner cone 1-4 is arranged in the upper grain collecting cylinder 1-1 and the lower grain collecting conical hopper 1-2 and is fixedly connected to the inner wall of the upper grain collecting cylinder 1-1 through the connecting rod 1-5. The inner cone 1-4, the upper grain collecting cylinder 1-1, and the lower grain collecting conical hopper 1-2 are connected as a whole. A cavity is formed between the inner cone 1-4 and the inner walls of the upper grain collecting cylinder 1-1 and the lower grain collecting conical hopper 1-2 for accommodating the grain from the feed pipe 8. A circular grain outlet is provided at the lower part of the inner cone 1-4;

[0071] The upper grain collecting cylinder 1-1 is connected to the lower grain collecting hopper 1-2 through an elastic mechanism 1-3, and the upper grain collecting cylinder 1-1 can be adjusted in the axial height position relative to the lower grain collecting hopper 1-2. That is, the upper grain collecting cylinder 1-1 can move in the height direction, forming a pressure change according to the amount and weight of the grain and generating a reaction force. When there is more grain and the weight is heavier, the elastic mechanism is stretched to form a reaction force, so as to compact the grain between the two conical surfaces of the inner cone 1-4 and the lower grain collecting hopper 1-2, discharge the air in the grain gap, and form a negative pressure in the center when the grain flows out from the grain outlet, prompting the grain and dust to contract towards the center, reducing dust emission, avoiding the divergence of the grain flow, and ensuring that the sample falls from the center.

[0072] The elastic mechanism 1-3 includes a tension spring, a guide post, a guide sleeve, etc. The guide post is connected to the upper grain collecting cylinder 1-1, the guide sleeve is connected to the lower grain collecting hopper 1-2, the guide post and the guide sleeve are matched, and the guide sleeve can slide axially in the guide post. The two ends of the tension spring are respectively connected to the upper grain collecting cylinder 1-1 and the lower grain collecting hopper 1-2, and the gravity of the lower grain collecting hopper and the grain acts on the tension spring, so that the position between the upper grain collecting cylinder 1-1 and the lower grain collecting hopper 1-2 changes with the change of the grain weight.

[0073] The slip ring 1-10 includes an outer ring, an inner ring, outer ring wires, and inner ring wires. The outer ring and the inner ring are connected to the grain collecting rotating device 1-9, the outer ring wires are electrically connected to the electric control device 11, and the inner ring wires are electrically connected to the electric push rod 1-6-3 of the grain blocking device. Specifically, the outer ring is fixedly connected to the fixed seat 1-9-2 of the grain collecting motor reducer of the grain collecting device, the inner ring is fixedly connected to the rotating shaft 1-9-3 of the grain collecting device, the outer ring wires are electrically connected to the electric control device 11, and the inner ring wires are electrically connected to the electric push rod 1-6-3 of the grain blocking device.

[0074] Combined with Figure 3 , Figure 4, the grain collecting and rotating device 1-9 includes a grain collecting motor reducer 1-9-1, a grain collecting motor reducer fixing seat 1-9-2, a rotating shaft 1-9-3, and a thrust bearing 1-9-4; the grain collecting motor reducer 1-9-1 is fixedly installed on the grain collecting motor reducer fixing seat 1-9-2 by bolts, and the grain collecting motor reducer 1-9-1 is connected to the upper end of the rotating shaft 1-9-3; the thrust bearing 1-9-4 is installed on the grain collecting motor reducer fixing seat 1-9-2, and the upper end of the rotating shaft 1-9-3 is connected to the thrust bearing 1-9-4 in a mating manner. The lower end of the rotating shaft 1-9-3 passes through the bearing and is fixedly connected to the inner cone 1-4 by bolts. The grain collecting motor reducer 1-9-1 is electrically connected to the controller 11-2 of the electric control device. The electric control device controls the operation of the grain collecting motor reducer 1-9-1 and drives the integral structure formed by connecting the inner cone 1-4, the upper grain collecting cylinder 1-1, and the lower grain collecting hopper 1-2 to rotate through the rotating shaft 1-9-3. The grain collecting motor reducer 1-9-1 rotates when the grain enters through the feed pipe 8, so that the grains are evenly distributed in a ring-shaped layer when falling into the cavity, and the grains are mixed during the collection process.

[0075] Combined with Figure 5 , the grain blocking device 1-6 includes a support frame 1-6-4, a grain blocking plate 1-6-1, and an electric push rod 1-6-3. A slideway 1-6-2 is provided on the support frame 1-6-4. The electric push rod 1-6-3 is connected to the support frame 1-6-4. The grain blocking plate 1-6-1 is installed at the outlet position of the lower grain collecting hopper 1-2. The grain blocking plate 1-6-1 can move on the slideway 1-6-2. When the grain blocking plate 1-6-1 does not block the outlet of the lower grain collecting hopper 1-2, the grains flow out from the outlet. When the grain blocking plate 1-6-1 blocks the outlet of the lower grain collecting hopper 1-2, the grains cannot flow out; the support frame 1-6-4 of the grain blocking device 1-6 is fixed to the lower part of the lower grain collecting hopper 1-2; one end of the electric push rod 1-6-3 is fixed to the support frame 1-6-4 and the other end is fixedly connected to the grain blocking plate 1-6-1. The electric push rod 1-6-3 is electrically connected to the electric control device, and its extension or retraction action is controlled by the electric control device, and the grain blocking plate 1-6-1 is driven to realize the grain blocking or discharging action.

[0076] A weighing sensor fixing seat 1-8 is provided on the grain collecting device 1. The weighing sensor fixing seat 1-8 is fixedly connected to the inner wall of the cabinet 5. A weighing sensor 1-7 is provided on the weighing sensor fixing seat 1-8. There are three weighing sensors 1-7. The fixed end of each weighing sensor 1-7 is fixedly connected to the weighing sensor fixing seat 1-8 by bolts, and the free end is connected to the grain collecting motor reducer fixing seat 1-9-2 by bolts; the weighing sensor 1-7 bears the weight of the grain collecting device 1 and the grains in the cavity. The weighing sensor 1-7 is electrically connected to the weighing instrument 11-3 of the electric control device 11, and can detect and calculate the weight of the collected grains.

[0077] Combined Figure 6 . Figure 7 , the multi-layer mixing device 2 includes multiple groups of mixing modules, and the multiple groups of mixing modules are coaxially arranged from top to bottom. Each group of mixing modules includes a conical hopper 2-1, a conical hopper fixing seat 2-2, a mixing and reducing rotating disk 2-3, and a deflector 2-4. A grain outlet is provided at the lower part of the conical hopper 2-1, and the outer wall of the conical hopper 2-1 is fixedly connected to the conical hopper fixing seat 2-2. One end of the conical hopper fixing seat 2-2 is fixedly connected to the cabinet body 5. The mixing and reducing rotating disk 2-3 is located inside the conical hopper 2-1 and is coaxially arranged with the conical hopper 2-1. A uniform annular space is formed between the outer edge of the mixing and reducing rotating disk 2-3 and the inner wall of the conical hopper 2-1.

[0078] A plurality of deflectors 2-4 are provided on the inner wall of the conical hopper 2-1. The reverse sides of the plurality of deflectors 2-4 are fixed in the middle of the inner wall of the conical hopper 2-1 at uniform interval angles, dividing the annular space inside the conical hopper 2-1 into multiple semi-closed spaces with the same angle, and a plurality of the deflectors 2-4 are provided.

[0079] Each of the mixing and reducing rotating disks 2-3 is installed at different height positions on the mixing and reducing rotating shaft 4-4 of the mixing and reducing driving device 4. The mixing and reducing rotating shaft 4-4 passes through the shaft holes of each mixing and reducing rotating disk 2-3 and operates under the drive of the mixing and reducing motor reducer 4-1, driving each mixing and reducing rotating disk 2-3 to rotate.

[0080] The mixing and reducing rotating disk 2-3 includes a central disk surface 2-3-1 of the mixing and reducing rotating disk and an outer disk surface 2-3-2 of the mixing and reducing rotating disk which are connected. The central disk surface 2-3-1 of the mixing and reducing rotating disk is a planar structure, and the outer disk surface 2-3-2 of the mixing and reducing rotating disk is an arc-shaped structure. Key grooves 2-3-3 are respectively opened on the shaft holes of the central disk surface 2-3-1 of the mixing and reducing rotating disk. Key grooves are provided on the outer circle of the mixing and reducing rotating shaft 4-4 of the mixing and reducing driving device 4. The central disk surface is connected to the mixing and reducing rotating shaft 4-4 through the cooperation of keys and key grooves.

[0081] Combined Figure 16 , Figure 17 , Figure 18, the deflector 2-4 adopts a curved structure with small ends and a large center, and its transverse section is a hyperbolic structure. The edges are processed with rounded corners, without acute angles or dead ends. Specifically, the deflector top 2-4-1, deflector bottom 2-4-2, upper reverse deflector 2-4-3, upper forward deflector 2-4-4, lower reverse deflector 2-4-5, and lower forward deflector 2-4-6 of the deflector 2-4 all adopt a deflector surface 2-4-7 with a hyperbolic structure for the outer contour of the cross-section. The connections between the surfaces are all connected by curved surface transitions, without dead ends or sharp protrusions, ensuring that the grains and impurities in them will not be caught, stuck, or adhered, avoiding grain blockage and material adhesion, ensuring that all grains pass through the sample mixing process smoothly, and the sample mixing is uniform.

[0082] The hyperbolic structure brings the following effective effects: The deflector 2-4 divides the space inside the conical hopper into several uniform flexible sub-spaces, restricting the movement of grains mainly within the sub-spaces, breaking the original operation regularity, and promoting chaotic order; The curved structure with small ends and a large center is conducive to the smooth falling of grains to the discharge port without grain blockage; The rounded corner processing of the edges will not cause large impurities in the grains to be stuck and block the grain; The absence of dead ends will not cause small particles in the grains to be hung and adhered; The transition curved surface of the hyperbolic structure reduces the impulse received by the grains, avoiding secondary crushing of the grains; It promotes the disordered movement of grains, does not form dead ends, and ensures no material accumulation.

[0083] Combined Figure 8 , Figure 9 , the quartering device 3 includes a standard cylinder 3-1, a quartering device fixing seat 3-2, a surplus grain hopper 3-3, a sample hopper 3-4, a quartering rotating disk 3-5, a quartering ratio adjustment device 3-6, and a sample bucket 3-7; The standard cylinder 3-1 is cylindrical. The upper part of the standard cylinder 3-1 is fixedly connected to the quartering device fixing seat 3-2, and the lower part is respectively fixedly connected to the surplus grain hopper 3-3 and the sample hopper 3-4. The surplus grain hopper 3-3 is fixedly connected to the sample hopper 3-4. The quartering rotating disk 3-5 is arranged inside the standard cylinder 3-1, and the disk surface is lower than the upper edge of the standard cylinder 3-1 and is coaxially arranged with the standard cylinder 3-1. The quartering rotating disk 3-5 is fixedly connected to the quartering rotation shaft 4-4 of the sample mixing and quartering drive device 4; The quartering ratio adjustment device 3-6 is arranged inside the standard cylinder 3-1 and is respectively fixedly connected to the upper edges of the surplus grain hopper 3-3 and the sample hopper 3-4. The quartering ratio adjustment device 3-6 divides the standard cylinder 3-1 into multiple fan-shaped areas with adjustable angles. The fan-shaped areas include a surplus grain area and a sample area. The surplus grain area is flexibly connected to the surplus grain hopper 3-3, and the sample area is flexibly connected to the sample hopper 3-4; The sample bucket 3-7 is a container for accommodating samples. During sample division, it is placed below the outlet of each sample hopper 3-4 to receive samples from the sample hopper 3-4. After sample division, the samples can be taken away and sent to the laboratory. There are multiple sample buckets 3-7.

[0084] Similar to the structure of the mixing and reducing rotating disk 2-3, the reducing and dividing rotating disk 3-5 includes a central disk surface 3-5-1 of the reducing and dividing rotating disk and an outer disk surface 3-5-2 of the reducing and dividing rotating disk, the central disk surface 3-5-1 of the reducing and dividing rotating disk is a planar structure, the outer disk surface 3-5-2 of the reducing and dividing rotating disk is an arc structure, keyways 3-5-3 are respectively provided on the axial holes of the central disk surface 3-5-1 of the reducing and dividing rotating disk, a keyway is provided on the outer circle of the mixing and reducing rotating shaft 4-4 of the mixing and reducing driving device 4, and the central disk surface and the mixing and reducing rotating shaft 4-4 are connected by a key and a keyway.

[0085] Combination Figure 13 , Figure 14 , Figure 15 Since the mixing and dividing rotating disk 2-3 and the dividing and dividing rotating disk 3-5 both adopt a structure in which the central disk surface is a plane and the outer disk surface is an arc-shaped surface, when the grain moves from the center to the disk surface, the resistance in the central plane part is small, and the horizontal movement speed is rapidly increased from zero, and the grain is quickly and evenly distributed on the flat disk surface. The arc-shaped surface increases the resistance constraint on the grain and increases the time the grain stays on the disk surface, making the distribution of the grain more uniform when leaving the disk surface. At the same time, the arc-shaped surface forces the grain to form an upward velocity component, so that the grain stays in the air longer when leaving the disk surface, has greater kinetic energy, is thrown farther, and has more collision opportunities, which eliminates possible grain blockage and sticking, and has a better grain mixing effect.

[0086] Combination Figure 10 , Figure 11, the reduction ratio adjustment device 3-6 includes a reduction ratio adjustment motor reducer 3-6-1, a driving bevel gear 3-6-2, a driven bevel gear 3-6-3, a rotating seat 3-6-4, a fixed circular plate 3-6-5, bearings 3-6-6, a shaft tube 3-6-7, a motor fixing seat 3-6-8, a fixed partition plate 3-6-9, an adjustable partition plate 3-6-10, a rubber sealing plate 3-6-11, and a locking nut 3-6-12; the reduction ratio adjustment motor reducer 3-6-1 is fixedly connected to the motor fixing seat 3-6-8 by bolts, and the output shaft of the reduction ratio adjustment motor reducer 3-6-1 is connected to the driving bevel gear 3-6-2 through a shaft hole fit, such as an interference fit. The driving bevel gear 3-6-2 meshes with two upper and lower driven bevel gears 3-6-3 respectively. When the driving bevel gear 3-6-2 rotates in a certain direction along the axis, it drives the two upper and lower driven bevel gears 3-6-3 to rotate in opposite directions along their respective axes; the outer rings of the hubs of the two driven bevel gears 3-6-3 are in interference connection with the inner hole of the rotating seat 3-6-4, and the inner holes of the hubs are coaxial with the shaft tube 3-6-7 and are respectively in interference connection with the outer rings of a bearing 3-6-6 at this position; the inner tube of the rotating seat 3-6-4 is coaxial with the shaft tube 3-6-7 and is respectively in interference connection with the outer rings of a bearing 3-6-6 at this position, and the outer wall of the rotating seat 3-6-4 is fixedly connected to the adjustable partition plate 3-6-10 by bolts; the sample mixing and reduction rotating shaft 4-4 passes through the inner hole of the shaft tube 3-6-7 with sufficient clearance in the middle. An annular groove is provided at the upper end of the shaft tube 3-6-7, and a snap ring is embedded to fix the bearing 3-6-6I. External threads are provided at the lower end of the shaft tube 3-6-7 and are connected to the internal threads of the locking nut 3-6-12; the shaft tube 3-6-7 is connected in a transitional manner from top to bottom with the upper rotating seat 3-6-4, the upper driven bevel gear 3-6-3, the motor fixing seat 3-6-8, the lower driven bevel gear 3-6-3, the lower rotating seat 3-6-4, and the fixed circular plate 3-6-5, and is in interference connection with the bearings 3-6-6I, II, III, and IV; the lower surface of the fixed circular plate 3-6-5 is fixedly connected to the upper edges of the inner surfaces of the surplus grain hopper and the sample hopper, and the upper surface is connected to the lower edge of the inner ring of the bearing 3-6-6IV through a gasket, and there is a gap between the upper surface and the lower rotating seat 3-6-4; the shaft tube 3-6-7 and the components connected thereto are jointly fixed to the fixed circular plate 3-6-5 by the locking nut 3-6-12; there are two fixed partition plates 3-6-9. The lower edges of the fixed partition plates 3-6-9 are fixedly connected to the midlines of the two adjacent sample hoppers 3-4. The inner sides are close to the outer wall of the rotating seat 3-6-4, and the outer sides are fixedly connected to the inner wall of the standard cylinder 3-1; there are multiple adjustable partition plates 3-6-10, which are divided into two groups and are arranged in a cross pattern according to the group. One group of adjustable partition plates 3-6-10 is fixedly connected to the upper rotating seat 3-6-4 by bolts, and the other group is fixedly connected to the lower rotating seat 3-6-4 by bolts;The upper part of the rubber sealing plate 3-6-11 is symmetrically V-shaped and fixed on both sides of the adjustable partition plate 3-6-10. The lower part covers above the demarcation line between the sample hopper 3-4 and the surplus grain hopper 3-3. The inner side is closely attached to the outer wall of the rotating seat 3-6-4, and the outer side is closely attached to the inner wall of the standard cylinder 3-1. The rubber sealing plate 3-6-11 and the adjustable partition plate 3-6-10 jointly partition the grain. The fixed partition plate 3-6-9 and the adjustable partition plates 3-6-10 on both sides of it jointly form a set of two sample falling areas with the same angle, and the angle can be adjusted according to the reduction ratio. The reduction ratio adjustment motor reducer 3-6-1 is electrically connected to the controller of the electric control device, and adjusts the angle of the partition plate according to the electrical signal, controlling the angle ratio of the sample area in the entire radial cross-section of the standard cylinder, that is, the reduction ratio.

[0087] The two fixed partition plates 3-6-9 and the four adjustable partition plates 3-6-10 jointly divide the standard cylinder 3-1 into multiple fan-shaped areas with adjustable angles, including two surplus grain areas and four sample areas. The angles of the four sample areas can be adjusted synchronously with the rotation of the adjustable partition plate 3-6-10.

[0088] With an optimized design, the reduction ratio adjustment device 3-6 adopts a differential mechanical structure of one driving bevel gear and two driven bevel gears, sharing one motor reducer for angle adjustment. The equipment configuration is simple, the operation is more stable, the synchronism is better, and the consistency of the samples is improved.

[0089] The reduction ratio rotating disk 3-5 rotates driven by the mixing and reduction rotation shaft 4-4. When the grain falls from the outlet of the last-stage mixing and reduction rotating disk 2-3 of the multi-layer mixing device 2 to the middle of the reduction ratio rotating disk 3-5, the grain is accelerated to rotate in the same direction as the rotating disk under the influence of friction, and moves radially towards the edge of the rotating disk under the influence of centrifugal force, running in a divergent spiral trajectory on the disk surface. Finally, after leaving the upper surface of the reduction ratio rotating disk 3-5, it evenly falls into the standard cylinder 3-1, and then is distributed to the surplus grain area and the sample area, and finally falls into the surplus grain hopper 3-3 and the sample hopper 3-4 to complete the sample division process.

[0090] Combined Figure 12 , Figure 13 , Figure 14 , Figure 15, the sample mixing and reduction driving device 4 includes a sample mixing and reduction motor reducer 4-1, a sample mixing and reduction motor reducer fixing seat 4-2, a bearing 4-3, a sample mixing and reduction rotating shaft 4-4, a connecting plate 4-5, and a rotating shaft fixing seat 4-6; the sample mixing and reduction motor reducer 4-1 is connected to the sample mixing and reduction motor reducer fixing seat 4-2 by bolts, the power output end of the sample mixing and reduction motor reducer 4-1 is connected to the lower end of the sample mixing and reduction rotating shaft 4-4, the sample mixing and reduction motor reducer fixing seat 4-2 is bolted to the bottom plate of the cabinet 5, the lower bearing 4-3 is embedded in the sample mixing and reduction motor reducer fixing seat 4-2, the inner ring is in interference connection with the lower part of the sample mixing and reduction rotating shaft 4-4, and the outer ring is in interference connection with the sample mixing and reduction motor reducer fixing seat 4-2; the upper bearing 4-3 is embedded in the connecting plate 4-5, the inner ring is in interference connection with the upper part of the sample mixing and reduction rotating shaft 4-4, and the outer ring is in interference connection with the rotating shaft fixing seat 4-6. The rotating shaft fixing seat 4-6 is bolted and fixed to the three connecting plates 4-5, and the connecting plates 4-5 are respectively bolted and fixed to the conical hopper fixing seat 2-2. That is, the upper and lower parts of the sample mixing and reduction rotating shaft 4-4 are connected to the rotating shaft fixing seat 4-6 and the sample mixing and reduction motor reducer fixing seat 4-2 through the upper bearing 4-3 and the lower bearing 4-3 respectively.

[0091] The sample mixing and reduction motor reducer 4-1 is electrically connected to the controller 11-2 of the electric control device. The electric control device controls the rotation state and rotation speed of the sample mixing and reduction motor reducer 4-1, and drives the three sample mixing and reduction rotating disks 2-3 and the reduction rotating disk 3-5 of the sample mixing and reduction driving device 4 to rotate at a certain speed through the sample mixing and reduction rotating shaft 4-4.

[0092] The sample mixing and reduction rotating shaft 4-4 is connected with the three sample mixing and reduction rotating disks 2-3 of the sample mixing module and the reduction rotating disk 3-5 of the reduction device 3 from top to bottom. The sample mixing and reduction rotating disks 2-3 and the reduction rotating disk 3-5 are connected to the sample mixing and reduction rotating shaft 4-4 of the sample mixing and reduction driving device 4 through a key and keyway matching structure. Among them, the sample mixing and reduction rotating disk 2-3 is located in the upper layer, and the reduction rotating disk 3-5 is located in the bottom layer.

[0093] The grain falls from the outlet of the grain collecting device 1 into the multi-layer mixing device 2 for mixing. After the grain falls onto the upper surface of the first-stage mixing and reducing rotating disk 2-3 of the multi-layer mixing device 2, it rotates in the same direction as the mixing and reducing rotating disk 2-3 and accelerates due to the frictional force, and moves radially towards the edge of the mixing and reducing rotating disk 2-3 under the influence of the centrifugal force, presenting a divergent spiral running track on the disk surface of the mixing and reducing rotating disk 2-3. Finally, after detaching from the upper surface of the mixing and reducing rotating disk 2-3, it evenly falls into the conical hopper 2-1. After the grain falls into the conical hopper 2-1, it hits the inner wall of the conical hopper 2-1, the deflector 2-4, and other grains, changing its direction and speed multiple times. After being fully mixed evenly, it is gathered again from different angles under the influence of the reduced-diameter part at the lower part of the conical hopper 2-1 and falls into the next-stage device from the grain outlet of the conical hopper 2-1.

[0094] When the grain falls into the cavity in the grain collecting device 1, it is evenly distributed in a ring-shaped layer. The grain is preliminarily mixed during the collection process, and then is continuously mixed under the multiple actions of zoning and guiding, collision and mixing sequence, and constraint and gathering in the multi-layer mixing device 2, and reaches the requirement of sample uniformity after being fully mixed in multiple stages.

[0095] One end of the grain outlet pipe 9 passes through the cabinet body 5 and the shell of the surplus grain hopper 3-3, inserts into the bottom of the surplus grain hopper 3-3 to contact the grain, and is fixedly connected to the cabinet body 5 and the surplus grain hopper 3-3 respectively, and is used for air outlet or grain suction. The other end is connected to the inlet of the surplus grain collecting hopper 6. Figure 19 The electric control device 11 includes a controller 11-1, a touch screen 11-2, a weighing instrument 11-3, a grain collecting speed regulator 11-4, a mixing and reducing speed regulator 11-5, and other low-voltage electrical equipment, etc.; the controller 11-1 is electrically connected to the weighing instrument 11-3 and is used to detect the weight of the collected grain; the controller 11-1 is electrically connected to the reducing ratio adjustment device 3-6 and is used to control the reducing ratio; the controller 11-1 is electrically connected to the grain collecting speed regulator 11-4, and then is electrically connected to the grain collecting rotating motor, and is used to control the rotating speed of the grain collecting motor; the controller 11-1 is electrically connected to the mixing and reducing speed regulator 11-5, and then is electrically connected to the mixing and reducing rotating motor, and is used to control the rotating speed of the mixing and reducing motor; the controller 11-1 is electrically connected to the grain blocking electric push rod 1-6-3 and is used to control the opening and closing of the outlet of the lower grain collecting conical hopper; the electric control device is electrically connected to the suction fan and is used to control the start and stop of the suction fan; the touch screen 11-2 is communicatively connected to the controller 11-1 and is used as the man-machine interface of the system; through the touch screen 11-2 and the controller 11-1, the actions of various electrical and mechanical equipment are controlled, and the required reducing ratio is calculated according to the total amount of the collected grain and the set sample amount, and the mixing and reducing speed regulator 11-5 is controlled to perform pre-control of the reducing ratio, and the optimal mixing rotation speed is determined according to the grain variety and the mixing and reducing rotation speed is adjusted to achieve the best mixing and reducing effect.

[0096] The cabinet body 5 is equipped with an operation door, which is closely attached to the outer surface of the cabinet body 5 to maintain the sealing effect of the cabinet body 5.

[0097] The operation steps and working principle of the on-site grain receiving and sampling divider of the present invention are as follows:

[0098] 1) Grain collection stage

[0099] Operation steps: Place the sample bucket under the outlet of the sample hopper; close the cabinet sealing door; close the grain blocking plate; start the grain collection motor reducer; start the fan; start grain collection and primary mixing.

[0100] Working principle: After starting the grain collection motor reducer, the annular grain collection bucket cavity formed by the upper grain collection cylinder, the lower grain collection cone hopper, and the inner cone rotates around the central axis; when the fan operates, the air flows rapidly, and a negative pressure is formed inside the cabinet and in the connected pipelines. The external grain falls into the rotating grain collection bucket cavity from a fixed position along with the air flow through the grain inlet pipeline. The air flow cross-section suddenly becomes larger, and the air flow velocity drops rapidly. The grain and large particle dust fall to the bottom under the influence of gravity. The smaller particle dust enters the surplus grain bucket through the air outlet pipeline and the surplus grain bucket interface along with the air flow. The air flow cross-section suddenly becomes larger again, and at the same time, affected by the back pressure formed by the filter bag blockage, the air flow velocity drops to a lower level. The dust is blocked by the filter bag and falls to the bottom of the ash dropping chamber under the action of gravity. The dust passing through the first filter bag is blocked by the second filter bag and falls to the bottom of the dust filtering chamber under the influence of gravity. The clean air enters the fan inlet through the air distribution openings, the air outlet pipe interface, and the pipeline, and is discharged into the atmosphere from the fan outlet. When the grain falls from a fixed position into the rotating grain collection bucket cavity, due to the relative movement between the grain inlet position and the grain collection bucket cavity, the fallen grain is evenly spread in a ring shape on the grain surface in the cavity, and the continuously entering grain is stacked in layers, realizing primary mixing. The weighing instrument continuously detects the amount of grain in the grain collection bucket and can further calculate the grain inlet speed. When the sampling stops, the total amount of grain Wz is finally weighed.

[0101] 2) Sample mixing and sampling stage

[0102] Operation steps: Adjust the reduction ratio, start the sample mixing and sampling motor reducer, and open the grain blocking plate; the grain in the grain collection bucket passes through the multi-stage sample mixing device and the reduction device in sequence from the lower outlet of the grain collection cone hopper, is mixed and sampled, the sample falls into the sample hopper, and the surplus grain enters the surplus grain hopper along with the air flow.

[0103] Working principle: Calculate the reduction ratio Ks according to the ratio of the target sub-sample amount Ws to the total amount of grain Wz, that is: Ks = Ws / Wz;

[0104] Further calculate the reduction angle Ss = 360 × Ks;

[0105] The electronic control device controls the reduction ratio adjustment device to adjust the angle of the sample area to Ss;

[0106] After the grain blocking plate is opened, the grain in the grain collecting bucket falls from the lower outlet of the grain collecting conical hopper onto the rotating disk surface of the first-stage sample mixing. Affected by the frictional force, the grain rotates in the same direction as the rotating disk and accelerates. Affected by the centrifugal force, it moves radially towards the edge of the rotating disk and forms a divergent spiral running track on the disk surface. Finally, after leaving the upper surface of the rotating disk, it uniformly falls into the conical hopper. After the grain falls into the conical hopper, it collides with the inner wall of the conical hopper, the guide plate, and other grains, changing its direction and speed multiple times, and is fully mixed. Then, affected by the reduced-diameter part at the lower part of the conical hopper, it is concentrated again from different angles to the grain outlet of the lower conical hopper and falls into the next-stage device.

[0107] The guide plate divides the space in the conical hopper into several uniform flexible sub-spaces, restricting the movement of the grain mainly within the sub-spaces, breaking the original running regularity, and promoting the mixing order.

[0108] The grain is continuously mixed under the multiple actions of rotation and equalization, partitioned diversion, collision and mixing order, and constraint and gathering in each stage of the grain collecting device. After being fully mixed through multiple stages, it meets the requirements for the uniformity of the sample.

[0109] When the grain that has been mixed through multiple stages falls to the middle of the rotating disk, affected by the frictional force, the grain rotates in the same direction as the rotating disk and accelerates. Affected by the centrifugal force, it moves radially towards the edge of the rotating disk and forms a divergent spiral running track on the disk surface. Finally, after leaving the upper surface of the rotating disk, it uniformly falls into the standard cylinder, and then is distributed to the surplus grain area and the sample area, and finally falls into the surplus grain hopper and the sample hopper to complete the sample splitting process.

[0110] The grain that enters the sample hopper falls from the lower outlet of the sample hopper into the sample bucket to achieve sample collection; the grain that falls into the surplus grain hopper follows the air flow at the bottom of the surplus grain hopper and enters the surplus grain collection bucket through the air outlet pipe and the surplus grain bucket interface. The cross-section of the air flow suddenly becomes larger for the second time, and at the same time, affected by the back pressure formed by the blockage of the filter bag, the air flow speed drops to a lower level. The dust is blocked by the filter bag and falls to the bottom of the ash drop chamber under the action of gravity. The dust that passes through the first filter bag is blocked by the second filter bag and falls to the bottom of the dust filtering chamber under the influence of gravity. The clean air enters the inlet of the fan through the air outlet pipe interface and the pipeline and is discharged into the atmosphere from the outlet of the fan.

[0111] Through the optimization and improvement of various parts such as grain collection, mixing, and reduction of the present invention, a multi-functional sample splitter with the functions of sample collection, mixing, sample splitting, surplus grain transfer, and dust removal is provided. During the grain collection process, pre-mixing is carried out simultaneously. After being mixed through multiple stages, the grain is fully mixed. Finally, through the reduction process with an adjustable reduction ratio, a uniform sub-sample with the required weight is obtained at one time; the next grain collection process of the present invention can be parallel to the mixing, sample splitting, and surplus grain transfer processes of the previous batch, with high time utilization rate, effectively improving the work efficiency, and effectively ensuring the mixing and sample splitting effects, meeting the performance indicators required by the standard; the entire operation process is automatically carried out in a sealed space, without causing dust leakage, and improving the working environment.

[0112] In the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for describing the present invention rather than requiring the present invention to be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "coupled" in the present invention should be understood in a broad sense. For example, it may be welding or a detachable connection; it may be a direct connection or an indirect connection through an intermediate member. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0113] Except for the technical features described in the specification, the rest are known technologies to those skilled in the art.

[0114] The above is the preferred embodiment of the present invention. The description of specific embodiments is only for better understanding the idea of the present invention. For those of ordinary skill in the art, several improvements or equivalent substitutions can be made according to the principle of the present invention, and these improvements or equivalent substitutions are also considered to fall within the protection scope of the present invention.

Claims

1. A on-site grain receiving and sampling divider, comprising a grain collecting device, a sample mixing device, a reduction and division device, a cabinet body, a grain inlet pipeline, and a grain outlet pipeline. The upper part of the cabinet body is connected to the grain inlet pipeline, and the lower part is connected to the grain outlet pipeline. Its characteristics are that, It also includes a sample mixing and reduction driving device, a suction fan, a surplus grain collecting hopper, a grain outlet pipe, an air outlet pipe, and an electric control device. The sample mixing device adopts a multi-layer sample mixing device. The sample mixing device, the reduction device, and the sample mixing and reduction driving device are connected. The grain collecting device, the multi-layer sample mixing device, the reduction device, and the sample mixing and reduction driving device are installed in a sealed cabinet. The grain collecting device, the multi-layer sample mixing device, and the reduction device are connected in sequence from top to bottom. The surplus grain collecting hopper is installed outside the cabinet. The inlet of the surplus grain collecting hopper is connected to the grain outlet pipe, and the outlet is connected to the inlet of the suction fan through the air outlet pipe. The outlet of the suction fan communicates with the atmosphere. The electric control device is electrically connected to the grain collecting device, the reduction device, and the sample mixing and reduction driving device respectively; The multi-layer sample mixing device includes multiple groups of sample mixing modules. The multiple groups of sample mixing modules are coaxially arranged from top to bottom. Each group of sample mixing modules includes a conical hopper, a conical hopper fixing seat, a sample mixing and reduction rotating disk, and a guide plate; an outlet for discharging grain is provided at the lower part of the conical hopper. The outer wall of the conical hopper is connected to the conical hopper fixing seat. One end of the conical hopper fixing seat is connected to the cabinet. The sample mixing and reduction rotating disk is located inside the conical hopper and is coaxially arranged with the conical hopper. A uniform annular space is formed between the outer edge of the sample mixing and reduction rotating disk and the inner wall of the conical hopper; The reduction device includes a standard cylinder, a reduction device fixing seat, a surplus grain hopper, a sample hopper, a reduction rotating disk, a reduction ratio adjustment device, and a sample bucket; the standard cylinder is cylindrical. The upper part of the standard cylinder is connected to the reduction device fixing seat, and the lower part is fixedly connected to the surplus grain hopper and the sample hopper respectively. The surplus grain hopper is fixedly connected to the sample hopper. The reduction rotating disk is arranged inside the standard cylinder, and the disk surface is lower than the upper edge of the standard cylinder and is coaxially arranged with the standard cylinder. The reduction rotating disk is connected to the sample mixing and reduction rotating shaft of the sample mixing and reduction driving device; the reduction ratio adjustment device is arranged inside the standard cylinder and is connected to the upper edges of the surplus grain hopper and the sample hopper respectively. The reduction ratio adjustment device divides the standard cylinder into multiple fan-shaped areas with adjustable angles. The fan-shaped areas include a surplus grain area and a sample area. The surplus grain area is flexibly connected to the surplus grain hopper, and the sample area is flexibly connected to the sample hopper; the sample bucket is placed below the outlet of each sample hopper for receiving samples from the sample hopper.

2. The on-site grain receiving and sample dividing device according to claim 1, characterized in that, The grain collecting device includes an upper grain collecting cylinder, a lower grain collecting conical hopper, an elastic mechanism, an inner cone, a connecting rod, a grain blocking device, a weighing sensor, and a grain collecting rotating device; the upper grain collecting cylinder is a cylindrical cylinder without a bottom and is nested inside the lower grain collecting conical hopper. The inner cone is arranged inside the upper grain collecting cylinder and the lower grain collecting conical hopper and is connected to the inner wall of the upper grain collecting cylinder through a connecting rod. The inner cone, the upper grain collecting cylinder, and the lower grain collecting conical hopper are connected as a whole. A cavity is formed between the inner cone and the inner walls of the upper grain collecting cylinder and the lower grain collecting conical hopper for accommodating the grain from the feed pipe. A circular grain outlet is provided at the lower part of the inner cone; the grain blocking device cooperates with the outlet of the lower grain collecting conical hopper. A weighing sensor is provided on the grain collecting device. The upper grain collecting cylinder is connected to the lower grain collecting conical hopper through an elastic mechanism, and the upper grain collecting cylinder can be adjusted in the axial height position relative to the lower grain collecting conical hopper.

3. The on-site grain receiving and sampling divider according to claim 2, characterized in that, The grain blocking device includes a support frame, a grain blocking plate, and an electric push rod. The support frame is fixedly connected to the lower part of the lower grain collecting hopper. A slideway is provided on the support frame. The electric push rod is connected to the support frame. The grain blocking plate is installed at the outlet position of the lower grain collecting hopper and can move on the slideway. One end of the electric push rod is fixed to the lower part of the lower grain collecting hopper, and the other end is connected to the grain blocking plate. The grain collecting device further includes a slip ring. The slip ring includes an outer ring, an inner ring, outer ring wires, and inner ring wires. The outer ring is fixedly connected to the fixed seat of the grain collecting motor reducer of the grain collecting device. The inner ring is fixedly connected to the rotating shaft of the grain collecting device. The outer ring wires are electrically connected to the electric control device. The inner ring wires are electrically connected to the electric push rod of the grain blocking device. The electric push rod is electrically connected to the electric control device through the slip ring wires.

4. The on-site grain receiving and sample dividing device according to claim 2, characterized in that, The grain collecting rotating device includes a grain collecting motor reducer, a fixed seat of the grain collecting motor reducer, a rotating shaft, and a thrust bearing. The grain collecting motor reducer is installed on the fixed seat of the grain collecting motor reducer. The grain collecting motor reducer is connected to the upper end of the rotating shaft. The thrust bearing is installed on the fixed seat of the grain collecting motor reducer. The upper end of the rotating shaft is connected to the thrust bearing in a matching manner. The rotating shaft passes through the bearing and the lower end is connected to the inner cone. The grain collecting motor reducer is electrically connected to the controller of the electric control device.

5. The on-site grain receiving and sample dividing device according to claim 1, characterized in that, A plurality of guide plates are provided on the inner wall of the conical hopper. The reverse sides of the plurality of guide plates are fixed in the middle of the inner wall of the conical hopper at uniform interval angles, dividing the annular space in the conical hopper into a plurality of semi-closed spaces with the same angle. Each sample mixing and reduction rotating disk is installed at different height positions on the sample mixing and reduction rotating shaft of the sample mixing and reduction driving device. The sample mixing and reduction rotating shaft passes through the shaft holes of each sample mixing and reduction rotating disk and operates under the drive of the sample mixing and reduction motor reducer, driving each sample mixing and reduction rotating disk to rotate.

6. The on-site grain receiving and sampling divider according to claim 1, characterized in that, The sample mixing and reduction rotating disk includes a central disk surface and an outer disk surface of the sample mixing and reduction rotating disk that are connected. The reduction rotating disk includes a central disk surface and an outer disk surface of the reduction rotating disk that are connected. The central disk surfaces of the sample mixing and reduction rotating disk and the reduction rotating disk are of a planar structure. The outer disk surfaces of the sample mixing and reduction rotating disk and the reduction rotating disk are of an arc structure. The central disk surfaces of the sample mixing and reduction rotating disk and the reduction rotating disk are connected to the sample mixing and reduction rotating shaft of the sample mixing and reduction driving device. The guide plate adopts a curved structure with small ends and a large center, and the transverse section is a hyperbolic structure.

7. The on-site grain receiving and sample dividing device according to claim 1, characterized in that, The sample reduction ratio adjustment device includes a sample reduction ratio adjustment motor reducer, a driving bevel gear, a driven bevel gear, a rotating seat, a fixed circular plate, bearings, a shaft tube, a motor fixing seat, a fixed partition plate, an adjustable partition plate, a rubber sealing plate, and a locking nut; the sample reduction ratio adjustment motor reducer is connected to the motor fixing seat, the output shaft of the sample reduction ratio adjustment motor reducer is connected to the driving bevel gear, the driving bevel gear meshes with the upper and lower driven bevel gears respectively, the outer ring of the hub of the driven bevel gear is in interference fit with the inner hole of the rotating seat, the inner hole of the hub is coaxial with the shaft tube, and is in interference fit with the outer ring of a bearing at this position respectively; the inner tube of the rotating seat is coaxial with the shaft tube, and is in interference fit with the outer ring of a bearing at this position respectively, and the outer wall of the rotating seat is connected to the adjustable partition plate; the mixing and sample reduction rotating shaft penetrates through the inner hole of the shaft tube with a gap in the middle, an annular groove is provided at the upper end of the shaft tube, a circlip is embedded to fix bearing I, and an external thread is provided at the lower end of the shaft tube and is connected to the internal thread of the locking nut; the shaft tube is connected in a transitional manner from top to bottom to the upper rotating seat, the upper driven bevel gear, the motor fixing seat, the lower driven bevel gear, the lower rotating seat, and the fixed circular plate, and is in interference fit with each bearing; the lower surface of the fixed circular plate is fixedly connected to the upper edges of the inner surfaces of the surplus grain hopper and the sample hopper, the upper surface is connected to the lower edge of the inner ring of the bearing through a gasket, and there is a gap between the lower surface of the fixed circular plate and the lower rotating seat; there are two fixed partition plates, the lower edges of the fixed partition plates are connected to the midlines of the two adjacent sample hoppers, the inner sides are close to the outer wall of the rotating seat, and the outer sides are connected to the inner wall of the standard cylinder; there are multiple adjustable partition plates, which are divided into two groups and are arranged in a cross layout by group, one group of adjustable partition plates is connected to the upper rotating seat, and the other group is connected to the lower rotating seat; the upper part of the rubber sealing plate is symmetrically fixed in a V-shape on both sides of the adjustable partition plate, the lower part covers above the boundary line between the sample hopper and the surplus grain hopper, the inner side is closely attached to the outer wall of the rotating seat, and the outer side is closely attached to the inner wall of the standard cylinder, and the rubber sealing plate and the adjustable partition plate jointly divide the grains; the fixed partition plate and the adjustable partition plates on both sides of it jointly form a set of two sample falling areas with the same angle, and the angle can be adjusted according to the sample reduction ratio; the sample reduction ratio adjustment motor reducer is electrically connected to the controller of the electric control device, and adjusts the angle of the partition plate according to the electrical signal to control the angle ratio of the sample area in the radial cross-section of the entire standard cylinder, that is, the sample reduction ratio.

8. The on-site grain receiving and sample dividing device according to claim 1, characterized in that, The sample mixing and reduction drive device includes a sample mixing and reduction motor reducer, a fixed seat for the sample mixing and reduction motor reducer, a bearing, a sample mixing and reduction rotating shaft, a connecting plate, and a rotating shaft fixed seat; the sample mixing and reduction motor reducer is connected to the fixed seat of the sample mixing and reduction motor reducer, the power output end of the sample mixing and reduction motor reducer is connected to the lower end of the sample mixing and reduction rotating shaft, the fixed seat of the sample mixing and reduction motor reducer is connected to the bottom plate of the cabinet, the bearing at the lower end is embedded in the fixed seat of the sample mixing and reduction motor reducer, the inner ring is in interference connection with the lower part of the sample mixing and reduction rotating shaft, and the outer ring is in interference connection with the fixed seat of the sample mixing and reduction motor reducer; the bearing at the upper end is embedded in the fixed seat of the sample mixing and reduction rotating shaft, the inner ring is in interference connection with the upper part of the sample mixing and reduction rotating shaft, and the outer ring is in interference connection with the rotating shaft fixed seat. The fixed seat of the sample mixing and reduction rotating shaft is connected to the connecting plate, and the connecting plate is respectively connected to the fixed seat of the conical hopper; The sample mixing and reduction motor reducer is electrically connected to the controller of the electric control device; On the sample mixing and reduction rotating shaft, three sample mixing and reduction rotating disks of the sample mixing module and a reduction rotating disk of the reduction device are respectively connected from top to bottom. The sample mixing and reduction rotating disks and the reduction rotating disk are connected to the sample mixing and reduction rotating shaft of the sample mixing and reduction drive device through a key and keyway matching structure. Among them, the sample mixing and reduction rotating disk is located in the upper layer, and the reduction rotating disk is located in the bottom layer.

9. The on-site grain receiving and sample dividing device according to claim 1, characterized in that, The electric control device includes a controller, a touch screen, a weighing instrument, a grain collecting speed governor, a sample mixing and reduction speed governor, and other low-voltage electrical equipment; The controller is electrically connected to the weighing instrument and is used to detect the weight of the collected grain; The controller is electrically connected to the reduction ratio adjustment device and is used to control the reduction ratio; The controller is electrically connected to the grain collecting speed governor, and then electrically connected to the grain collecting rotating motor, and is used to control the rotating speed of the grain collecting motor; the controller is electrically connected to the sample mixing and reduction speed governor, and then electrically connected to the sample mixing and reduction rotating motor, and is used to control the rotating speed of the sample mixing and reduction motor; The controller is electrically connected to the blockage prevention electric push rod and is used to control the opening and closing of the outlet of the lower grain collecting conical hopper; The controller is electrically connected to the reduction ratio adjustment motor reducer and is used to control the reduction ratio; The electric control device is electrically connected to the suction fan and is used to control the start and stop of the fan; The touch screen is communicatively connected to the controller and is used as the human-machine interface of the system; through the touch screen and the controller, the actions of various electrical and mechanical equipment are controlled, and the required reduction ratio is calculated according to the total amount of the collected grain and the set sample amount, and the sample mixing and reduction speed governor is controlled to perform pre-control of the reduction ratio, and the optimal sample mixing rotation speed is determined according to the grain type, and the sample mixing and reduction rotation speed is adjusted.

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