Grain sampling division device and grain sampling system

Abstract

The utility model discloses a grain sampling and splitting device and a grain sampling system in the technical field of grain sampling and splitting, the grain sampling and splitting device comprises a mixing mechanism and a sample splitting mechanism, the sample splitting mechanism comprises a tripod shell, the tripod shell is provided with a grain inlet communicated with the mixing mechanism, a supporting plate is fixedly connected in the tripod shell through a plurality of partition plates, and the grain inlet is communicated with the mixing mechanism. The tripod shell is provided with a parallel sample chamber, a sample preparation chamber and a test sample chamber, the partition plates are arranged on the outer side of the supporting plate to form a plurality of feeding grating openings, the feeding grating openings are divided into three groups correspondingly communicated with the parallel sample chamber, the sample preparation chamber and the test sample chamber respectively, the supporting plate is connected with a cone, and the cone is connected with the partition plates. The tripod shell is provided with a first material distributing pipe, a second material distributing pipe and a third material distributing pipe. According to the grain sampling division device, mixed sampled grains can be divided into three parts in proportion according to requirements, the situation that detection cannot be completed due to the fact that a certain sample is not enough due to uneven sample division is reduced, and the detection results of the three groups of grain samples are close to each other.

Description

Technical Field

[0001] This utility model relates to the field of grain sampling and reduction technology, and in particular to a grain sampling and reduction device and a grain sampling system. Background Technology

[0002] Grain sampling reduction involves using specialized equipment to collect representative original samples from a large batch of grain and progressively reduce them to small samples of the weight required for laboratory testing. This ensures that the small sample ultimately delivered to the laboratory represents the average quality of the entire batch of grain to the greatest extent possible, thereby guaranteeing the representativeness, accuracy, and reliability of the test results. Currently, grain sampling requires the creation of three samples: a parallel sample (a backup sample for retesting or dispute resolution), a reserve sample (for archiving), and an inspection sample (for actual testing). This ensures the representativeness and traceability of the test results.

[0003] Chinese patent application CN120063819A, entitled "A Mixed Sampling System," includes a sampler, a negative pressure chamber, a first conveying pipeline, a mixing mechanism, a second conveying pipeline, and a sample separating mechanism. The sampler has a sampling tube for sampling raw grains; the negative pressure chamber creates negative pressure and is connected to the sampling tube via the first conveying pipeline, enabling independent sampling, mixing, and separating functions, allowing samples to be divided into waste material and test samples. However, it can only separate mixed samples into waste material and test samples, and it cannot control the amount of each type. Specifically, it cannot divide the sample into three parts—parallel sample, reserve sample, and test sample—using a constant volume method. Since the required quantities of the three types of samples differ, improper initial division can lead to inconvenience or even affect the final test results if the quantity of a certain sample is insufficient or excessive later. Utility Model Content

[0004] To overcome the above-mentioned shortcomings of the prior art, the technical problem to be solved by this utility model is: how to divide the mixed sample into three parts as needed.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A grain sampling and reduction device includes a mixing mechanism and a sampling mechanism connected sequentially from top to bottom along the direction of gravity. The mixing mechanism is used to mix grain samples taken multiple times. The sampling mechanism includes a bell-shaped shell with a grain inlet at the upper end that communicates with the mixing mechanism. A support plate is fixedly connected to the upper part of the bell-shaped shell through multiple partition plates. A parallel sample chamber, a preparation sample chamber, and an inspection sample chamber are sealed on the side of the bell-shaped shell away from the grain inlet. Multiple partition plates are evenly spaced along the circumference of the support plate to form multiple feed grids. The multiple feed grids are divided into three groups according to a preset number, corresponding to and communicating with the parallel sample chamber, the preparation sample chamber, and the inspection sample chamber, respectively. A cone is fixedly connected to the side of the support plate near the grain inlet. The central axis of the cone is collinear with the central axis of the grain inlet. A first dispensing pipe communicating with the parallel sample chamber, a second dispensing pipe communicating with the preparation sample chamber, and a third dispensing pipe communicating with the inspection sample chamber are detachably provided at the lower end of the bell-shaped shell.

[0007] Furthermore, the aforementioned support plate is an annular plate, the bottom diameter of the aforementioned cone is equal to the outer diameter of the annular plate, and the bottom surface of the cone is provided with a weight-reducing groove.

[0008] Furthermore, the aforementioned mixing mechanism includes a separation sample chamber, which includes a chamber body. The upper end of the chamber body has an opening, and a first sample dispensing funnel is embedded in the opening. The first sample dispensing funnel is connected to a second sample dispensing funnel located inside the chamber body. A rotating shaft is located below the outlet of the second sample dispensing funnel inside the chamber body. A material distribution plate is fixedly sleeved on the rotating shaft. The material distribution plate divides the lower part of the chamber body into two grain chambers. The lower end of the chamber body has a grain shrinking pipe and a grain return pipe that are respectively connected to the two grain chambers. The grain shrinking pipe is connected to the aforementioned grain inlet.

[0009] Furthermore, a constant-volume tank is connected between the aforementioned separation sample chamber and the aforementioned bell-shaped shell. The upper end of the constant-volume tank is connected to the aforementioned grain shrinkage pipe, and the lower end is connected to the aforementioned grain inlet. A gate valve assembly is provided between the constant-volume tank and the grain inlet. A residual material pipe is connected to the upper end of the aforementioned constant-volume tank. The residual material pipe is inclined and its central axis forms an acute angle with the central axis of the constant-volume tank. The higher end of the residual material pipe in the direction of gravity is connected to the constant-volume tank, and the lower end is connected to the side wall of the aforementioned grain return pipe.

[0010] Furthermore, the aforementioned gate valve assembly includes a gate valve body disposed between the constant volume tank and the bell shell. The gate valve body has a flow port. A pair of gate valve side plates are disposed between the gate valve body and the constant volume tank, respectively located on both sides of the flow port. The pair of gate valve side plates are arranged opposite each other to form a gate channel. A gate plate for closing or opening the flow port is reciprocatingly slidable within the gate channel.

[0011] Furthermore, the angle between the central axis of the aforementioned residual material pipe and the central axis of the constant volume tank is 45 degrees.

[0012] Furthermore, the device includes a cabinet and a negative pressure generating device disposed within the cabinet. The cabinet is equipped with a grain sampling and reduction device as described in any of the above-mentioned embodiments. Both the negative pressure generating device and the grain sampling and reduction device are electrically connected to the control module. The cabinet is also equipped with a material collection tank assembly, which includes a first material collection tank connected to the first material distribution pipe, a second material collection tank connected to the second material distribution pipe, and a third material collection tank connected to the third material distribution pipe. The lower end of the first material collection tank is connected to a first material pipe and a first air inlet pipe. The lower end of the second material collection tank is connected to a second material pipe and a second air inlet pipe. The lower end of the third material collection tank is connected to a third material pipe and a third air inlet pipe. Both the first air inlet pipe and the third air inlet pipe are connected to the negative pressure generating device.

[0013] Furthermore, the cabinet is equipped with a first pipeline switching assembly, which includes a first mounting plate. The first mounting plate has two material selection ports spaced apart along its width axis. The first material pipe and the third material pipe are respectively connected to the two material selection ports. A first guide is slidably provided on the upper side of the first mounting plate along its width axis. The first guide is provided with a discharge pipe whose lower end face is attached to the upper side of the first mounting plate. A first switching cylinder electrically connected to the control module is fixedly installed on the first mounting plate. The first switching cylinder is used to drive the first guide to slide, thereby making the discharge pipe connected to one of the two material selection ports. A first ball valve is provided inside the discharge pipe.

[0014] Furthermore, the cabinet is equipped with a second pipeline switching assembly, which includes a second mounting plate. The second mounting plate has two air selection ports spaced apart along its width axis. The first air inlet pipe and the third air inlet pipe are respectively connected to the two air selection ports. A second guide is slidably provided on the upper side of the second mounting plate along its width axis. An air outlet pipe with its lower end face attached to the upper side of the second mounting plate is provided through the second guide. The end of the air outlet pipe away from the second mounting plate is connected to the negative pressure generating device. A second switching cylinder electrically connected to the control module is fixedly installed on the second mounting plate. The second switching cylinder is used to drive the second guide to slide, thereby making the air outlet pipe connected to one of the two air selection ports. A second ball valve is provided inside the air outlet pipe.

[0015] Furthermore, it also includes a dust collection structure, which includes a dust collection tank. The aforementioned air outlet pipe is connected to the dust collection tank. The aforementioned negative pressure generating device is fixedly installed on the circumferential side of the dust collection tank. The negative pressure generating device is connected to the upper end of the dust collection tank. A dust collection filter element is provided inside the dust collection tank.

[0016] The beneficial effects of this utility model are:

[0017] This grain sampling and reduction device adds a sampling mechanism to the mixing mechanism. It is equipped with a bell-shaped shell and contains a support plate, a cone, and multiple feed grids. The multiple feed grids are divided into three groups that are connected to the parallel sample chamber, the preparation sample chamber, and the test sample chamber inside the bell-shaped shell. This allows the mixed sampled grain to be divided into three portions proportionally as needed, reducing the occurrence of insufficient samples due to uneven sampling. This makes the test results of the three groups of sample grains more similar to each other, thereby reducing the occurrence of situations where the test cannot be completed due to the above-mentioned reasons. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the grain sampling system of this utility model;

[0019] Figure 2 This is one of the partial structural schematic diagrams of the grain sampling system of this utility model;

[0020] Figure 3 This is one of the partial structural schematic diagrams of the grain sampling and reduction device of this utility model;

[0021] Figure 4 This is the second partial structural schematic diagram of the grain sampling and reduction device of this utility model;

[0022] Figure 5 This is the second partial structural schematic diagram of the grain sampling system of this utility model;

[0023] Figure 6 This is the third partial structural schematic diagram of the grain sampling and reduction device of this utility model;

[0024] Figure 7 This is the fourth partial structural schematic diagram of the grain sampling and reduction device of this utility model;

[0025] Figure 8 This is the fifth partial structural schematic diagram of the grain sampling and reduction device of this utility model;

[0026] Figure 9 This is the sixth partial structural schematic diagram of the grain sampling and reduction device of this utility model;

[0027] Figure 10 This is the third partial structural schematic diagram of the grain sampling system of this utility model;

[0028] Figure 11 This is the fourth partial structural schematic diagram of the grain sampling system of this utility model;

[0029] Figure 12 This is a schematic diagram of the structure of the first mounting plate in the grain sampling system of this utility model;

[0030] Figure 13This is a schematic diagram of the structure of the second mounting plate in the grain sampling system of this utility model.

[0031] The diagram is labeled as follows: 1-mixing mechanism, 11-separation sample bin, 111-bin body, 1111-opening, 112-first sample funnel, 113-second sample funnel, 114-rotating shaft, 115-distribution plate, 116-grain return pipe, 1161-grain return port, 1162-grain return valve, 117-grain shrinkage pipe, 12-volume control tank, 13-gate valve assembly, 131-gate valve body, 1311-flow port, 132- Side plate of slide gate valve, 133-slide gate channel, 134-slide gate, 135-slide gate valve cylinder, 136-push plate, 14-residue pipe, 2-sampling mechanism, 21-bell shell, 211-grain inlet, 212-first distribution pipe, 213-second distribution pipe, 214-third distribution pipe, 22-support plate, 23-partition plate, 24-feed grid opening, 25-parallel sample chamber, 26-sample preparation chamber, 27-inspection sample chamber, 2 8-Conical body, 281-Weight reduction trough, 29-Vibration motor, 3-Temporary storage tank, 4-Sampling machine, 41-Sampling robot, 42-Sampling overhead track, 43-Grain return swing arm, 5-Cabinet, 6-Dust collection structure, 61-Dust collector tank, 62-Negative pressure generator, 63-Dust collector filter element, 64-Connecting pipe, 7-Collection tank assembly, 71-First collection tank, 72-Second collection tank, 73-Third collection tank, 74-First material pipe 75-Second feed pipe, 76-Third feed pipe, 77-First air inlet pipe, 78-Second air inlet pipe, 79-Third air inlet pipe, 8-First pipeline switching assembly, 81-First mounting plate, 82-Selection port, 83-First guide component, 84-Discharge pipe, 85-First switching cylinder, 9-Second pipeline switching assembly, 91-Second mounting plate, 92-Selection port, 93-Second guide component, 94-Discharge pipe, 95-Second switching cylinder. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] Example 1

[0034] like Figures 2-9As shown, the grain sampling and reduction device includes a mixing mechanism 1 and a sampling mechanism 2 connected sequentially from top to bottom along the direction of gravity. The mixing mechanism 1 is used to mix grain samples taken multiple times. The sampling mechanism 2 includes a bell-shaped shell 21. The upper end of the bell-shaped shell 21 has a grain inlet 211 that communicates with the mixing mechanism 1. The upper part of the bell-shaped shell 21 is fixedly connected to a support plate 22 by multiple partition plates 23. On the side of the bell-shaped shell 21 away from the grain inlet 211, a parallel sample chamber 25, a sample preparation chamber 26, and a test sample chamber 27 are sealed. The multiple partition plates 23 are arranged around the support plate 22. Multiple feed grids 24 are evenly spaced on the outer side, forming three groups of feed grids 24 that are respectively connected to the parallel sample chamber 25, the preparation sample chamber 26, and the inspection sample chamber 27. A cone 28 is fixedly connected to the support plate 22 near the grain inlet 211, with the central axis of the cone 28 collinear with the central axis of the grain inlet 211. The lower end of the bell-shaped shell 21 is detachably equipped with a first distribution pipe 212 connected to the parallel sample chamber 25, a second distribution pipe 213 connected to the preparation sample chamber 26, and a third distribution pipe 214 connected to the inspection sample chamber 27. The bottom surface of the cone 28 is fixedly connected to the support plate 22. During the processing, personnel can determine the number of feed grids 24 and the flow rate of each of the three sample grains (parallel sample, preparation sample, and inspection sample) according to the required ratio. For example, when the ratio of parallel samples, reserve samples, and test samples is 3:1:3, the number of feed grids 24 in the corresponding groups of parallel sample chamber 25, reserve sample chamber 26, and test sample chamber 27 are A, B, and C, respectively. The flow rate of a single feed grid 24 per unit time is X. The flow rates of the parallel sample chamber 25, reserve sample chamber 26, and test sample chamber 27 per unit time are S1, S2, and S3, respectively, where S1=A×X, S2=B×X, and S3=C×X. The ratio of the flow rates of the parallel sample chamber 25, reserve sample chamber 26, and test sample chamber 27 per unit time, S1:S2:S3, is 3:1:3. Therefore, personnel can calculate the number of feed grids 24 corresponding to each of the parallel sample chamber 25, reserve sample chamber 26, and test sample chamber 27 based on the known ratio and flow rate X. The preferred bell and tripod shell 21 is provided with a vibration motor 29 on the outside. The vibration motor 29 can reduce the adhesion and blockage of the mixed sample grain at the feed grid 24, and can also reduce the adhesion of sample grain particles inside the bell and tripod shell 21, thereby speeding up the passage of the sample grain through the sample separation mechanism 2.

[0035] When grain testing is required, the mixing mechanism 1 first mixes the sampled grain. After mixing, the sample grain enters the bell shell 21 through the grain inlet 211 and falls on the conical surface of the cone 28. It is relatively evenly dispersed by the cone 28 to multiple feed grids 24 located on the ring side of the support plate 22, and enters the corresponding chamber among the three chambers: parallel sample chamber 25, preparation sample chamber 26, and test sample chamber 27 through the multiple feed grids 24. The grain in the parallel sample chamber 25, preparation sample chamber 26, and test sample chamber 27 flows out through the first distribution pipe 212, the second distribution pipe 213, and the third distribution pipe 214. Because the central axis of the cone 28 is collinear with the central axis of the grain inlet 211, the grain flowing into the bell shell 21 from the grain inlet 211 can be evenly fed into multiple feed grids 24. Since the multiple feed grids 24 are made according to a set ratio, the grain flowing out from the first feed pipe 212, the second feed pipe 213 and the third feed pipe 214 will flow out in the designed ratio, resulting in three samples: a parallel sample, a reserve sample and an inspection sample. These three samples are separated from the same mixed sample, so the structure of the inspection process is closer, the error of the inspection results between the three samples will be less, and the situation of insufficient or excessive sample quantity is greatly improved.

[0036] The aforementioned support plate 22 is an annular plate, and the diameter of the base of the aforementioned cone 28 is equal to the outer diameter of the annular plate. The base of the cone 28 is provided with a weight-reducing groove 281. The weight-reducing groove 281 can be a conical groove, which allows the cone 28 to have an even distribution capacity while having a smaller weight, thereby reducing the load on the multiple partition plates 23. The support plate 22 and the cone 28 can be connected by welding. Designing the support plate 22 as an annular plate also contributes to weight reduction to some extent.

[0037] The aforementioned mixing mechanism 1 includes a separation sample chamber 11, which includes a chamber body 111. The upper end of the chamber body 111 has an opening 1111, into which a first sample dispensing funnel 112 is embedded. The first sample dispensing funnel 112 is connected to a second sample dispensing funnel 113 located within the chamber body 111. A rotating shaft 114 is located below the outlet of the second sample dispensing funnel 113 within the chamber body 111. A distribution plate 115 is fixedly fitted onto the rotating shaft 114, dividing the lower part of the chamber body 111 into two grain chambers. The lower end of the chamber body 111 has a grain shrinking pipe 117 and a grain return pipe 116, respectively connected to the two grain chambers. The grain shrinking pipe 117 is connected to the aforementioned grain inlet 211. The rotating shaft 114 is fixedly located within the chamber body 111. The connection between the first sampling funnel 112 and the second sampling funnel 113 allows for better mixing of the sampled grains. The mixed grains are divided into two parts by the dividing plate 115 and enter different grain chambers. Grain from one grain chamber enters the return grain pipe 116, while grain from the other grain chamber enters the shrinkage pipe 117 and then enters the sampling mechanism 2 through the grain inlet 211. This design reduces the amount of mixed grains, ensuring sufficient sample grains enter the sampling mechanism 2 while controlling the final test sample size. This results in more accurate test results and reduces the deviation in grain testing. Preferably, a temporary storage tank 3 located above the mixing mechanism 1 is also included. The temporary storage tank 3 has a temporary storage port at the upper end and an input port at the lower end. The input port is connected to the mixing mechanism 1, that is, the input port is connected to the opening 1111 on the storage body 111. A valve is provided at the input port. The sampled grain is put into the temporary storage tank 3 in batches. When all the sampled grain has entered the temporary storage tank 3 and the sampling of the sampled grain begins, the valve is opened.

[0038] A constant-volume tank 12 connects the aforementioned separation sample chamber 11 and the aforementioned bell-shaped shell 21. The upper end of the constant-volume tank 12 is connected to the aforementioned grain shrinkage pipe 117, and the lower end is connected to the aforementioned grain inlet 211. A gate valve assembly 13 is provided between the constant-volume tank 12 and the grain inlet 211. A residual material pipe 14 is connected to the upper end of the constant-volume tank 12. The residual material pipe 14 is inclined, and its central axis forms an acute angle with the central axis of the constant-volume tank 12. The higher end of the residual material pipe 14 in the direction of gravity is connected to the constant-volume tank 12, and the lower end is connected to the side wall of the aforementioned grain return pipe 116. A grain return port 1161 is opened on the side wall of the grain return pipe 116. The lower end of the residual material pipe 14 is connected to the grain return pipe 116 through the grain return port 1161. A grain return valve 1162 is provided at the opening end of the grain return pipe 116. The placement of the grain return port 1161 facilitates the installation of the residual material pipe 14, and the placement of the grain return valve 1162 allows for more convenient control of the opening and closing of the grain return pipe 116. When the device is not in use, the grain return valve 1162 is in the closed state. The inclined placement of the residual material pipe 14 and the constant volume tank 12 ensures that the grain entering the sampling mechanism 2 from the mixing mechanism 1 remains within the pre-required amount, thus achieving the requirement of constant volume.

[0039] The aforementioned gate valve assembly 13 includes a gate valve body 131 disposed between the volumetric tank 12 and the bell-shaped shell 21. The gate valve body 131 has a flow port 1311. A pair of gate valve side plates 132 are respectively located on both sides of the flow port 1311 between the gate valve body 131 and the volumetric tank 12. The pair of gate valve side plates 132 are arranged opposite each other to form a gate channel 133. A gate plate 134 for closing or opening the flow port 1311 is reciprocatingly slidably disposed in the gate channel 133. A gate valve cylinder 135 is fixedly installed on the upper side of the gate valve body 131. A push plate 136 is fixedly connected to the telescopic end of the gate valve cylinder 135. The push plate 136 is fixedly connected to the gate plate 134. Before the volumetric tank 12 is full, the slide valve assembly 13 is closed. At this time, the slide valve cylinder 135 is in its maximum extension and retraction state, and the slide plate 134 is located in the slide plate channel 133 and covers the flow port 1311. After all the grain in the mixing mechanism 1 has been added (generally, the volumetric tank 12 is full at this time; if the mixed sample grain being tested is not full, subsequent steps can still be performed), the slide valve assembly 13 opens, that is, the slide valve cylinder 135 retracts, causing the slide plate 134 to slide in the slide plate channel 133, the flow port 1311 opens, and the grain enters the bell and tripod shell 21 through the flow port 1311 and the grain inlet 211 for subsequent steps.

[0040] The angle between the central axis of the aforementioned residual material pipe 14 and the central axis of the constant volume tank 12 is 45 degrees. The optimal tilt angle is 45 degrees, and personnel can make adjustments to a certain extent depending on the type of grain. This design can, to a certain extent, utilize the weight of the grain itself to achieve a dynamic balance of grain storage within the constant volume tank 12.

[0041] Example 2

[0042] like Figures 1-13 As shown, the grain sampling system includes a control module and a sampling machine 4 electrically connected to the control module. It includes a cabinet 5 and a negative pressure generating device 62 located within the cabinet 5. The cabinet 5 contains a grain sampling and reduction device as described in any of Embodiment 1. Both the negative pressure generating device 62 and the grain sampling and reduction device are electrically connected to the control module. The cabinet 5 also contains a collection tank assembly 7, which includes a first collection tank 71 connected to the aforementioned first distribution pipe 212, and a collection tank 71 connected to the above-mentioned first distribution pipe 212. The second material distribution pipe 213 connects to the second collection tank 72 and the third collection tank 73 connects to the third material distribution pipe 214. The lower end of the first collection tank 71 is connected to the first material pipe 74 and the first air inlet pipe 77. The lower end of the second collection tank 72 is connected to the second material pipe 75 and the second air inlet pipe 78. The lower end of the third collection tank 73 is connected to the third material pipe 76 and the third air inlet pipe 79. The first air inlet pipe 77 and the third air inlet pipe 79 are both connected to the aforementioned negative pressure generating device 62. The temporary storage tank 3 located above the mixing mechanism 1 has a temporary storage port at its upper end and an input port at its lower end. The input port is connected to the mixing mechanism 1, and the valve at the input port is a solenoid valve electrically connected to the control module. The second air inlet pipe 78 and the second material pipe 75 are installed and connected to the sample packing machine (the sample packing machine has a packing function and also has an electrical device with a negative pressure function). The sampler 4 is an existing device. In this embodiment, the sampler 4 is selected as follows: Figure 1The sampler 4 shown includes a sampler rail 42, with a sampler robot 41 at one end and a grain return arm 43 slidably mounted at the other end. The grain return arm 43 includes a recovery tank slidably mounted on the sampler rail 42, a recovery port at the lower end of the recovery tank, a valve at the recovery port, and a recovery pipe connected to the upper end of the recovery tank. If there is remaining grain in the third collection tank 73 after testing, the third feed pipe 76 can be connected to the recovery pipe, and air can be introduced into the third air inlet pipe 79. The grain in the third collection tank 73 will return to the recovery tank through the third feed pipe 76 and the recovery pipe. When the grain in the recovery tank meets the discharge conditions (i.e., there is a vehicle directly below the recovery tank that can receive the remaining grain), the valve at the recovery port can be opened. During sampling and testing, the grain to be tested is typically loaded onto multiple transport vehicles. These vehicles are arranged sequentially below the sampling track 42. The sampling robot 41 samples the grain from each vehicle according to their order. During this process, the control module controls the sampling robot 41 to slide along the sampling track 42 until it reaches directly above the vehicle requiring sampling. After sampling, the control module controls the robot to stop sliding above the temporary storage tank 3. The robot then releases the sampled grain into the temporary storage tank 3 through its storage opening, completing the sampling process for that vehicle. Grain samples were taken from all vehicles carrying grain in accordance with the above method. After each sampling, the collected grain was put into temporary storage tank 3. The sampling was completed when all transport vehicles that required sampling had completed the sampling. After grain sampling is completed, the control module controls the opening of the solenoid valve at the inlet of the temporary storage tank 3, allowing the sampled grain in the temporary storage tank 3 to enter the mixing mechanism 1. The mixing mechanism 1 mixes the incoming grain, and the mixed grain enters the sampling mechanism 2. The sampling mechanism 2 distributes the incoming grain into the first collection tank 71, the second collection tank 72, and the third collection tank 73 according to a preset ratio. Subsequently, the control module controls the negative pressure generating device 62 to start, and the first air inlet pipe 77 and the third air inlet pipe 79 are ventilated. The grain flows through the first feed pipe 74 and the third feed pipe 76 to the area to be tested. At the same time, the control module can start the sample preparation and packaging machine. Gas is introduced through the second air inlet pipe 78, and the grain in the second collection tank 72 enters the sample preparation and packaging machine through the second feed pipe 75 for packaging. In this design, the sampled grain can be centrally transferred, saving more drive energy. Alternatively, a central processing unit can be used as the control module. The Central Processing Unit (CPU) is the core component of a computer system, responsible for executing instructions, processing data, and controlling the coordinated operation of various computer components. The negative pressure generating device 62 is a negative pressure fan.

[0043] The cabinet 5 contains a first pipeline switching assembly 8, which includes a first mounting plate 81. The first mounting plate 81 has two material selection ports 82 spaced apart along its width axis. The first material pipe 74 and the third material pipe 76 are respectively connected to the two material selection ports 82. A first guide member 83 is slidably mounted on the upper side of the first mounting plate 81 along its width axis. A discharge pipe 84, whose lower end face is in contact with the upper side of the first mounting plate 81, passes through the first guide member 83. A first switching cylinder 85, electrically connected to the control module, is fixedly mounted on the first mounting plate 81. The first switching cylinder 85 drives the first guide member 83 to slide, thereby connecting the discharge pipe 84 to one of the two material selection ports 82. A first ball valve is provided inside the discharge pipe 84. The telescopic end of the first switching cylinder 85 is fixedly connected to the side wall of the first guide member 83. When sample flow is not required, the control module controls the first ball valve to be closed. In the initial state, the first switching cylinder 85 is in a retracted state, meaning the first guide 83 is close to the body of the first switching cylinder 85. The discharge pipe 84 is connected to the material selection port 82 closer to the body of the first switching cylinder 85, which is connected to the third material pipe 76. When testing is required, gas is introduced into the third air inlet pipe 79. Simultaneously, the control module first controls the first ball valve to open. Since the first switching cylinder 85 is in the initial state, the discharge pipe 84 is connected to the third material pipe 76, which is connected to the third collection tank 73. Therefore, when gas is introduced into the third air inlet pipe 79, the gas enters the third collection tank 73. The material in the third collection tank 73 enters the discharge pipe 84 through the connected third material pipe 76 and the corresponding material selection port 82. The third collection tank 73 is connected to the test sample chamber 27 through the third distribution pipe 214. Therefore, the sample coming out of the discharge pipe 84 at this time is the sample from the test sample chamber 27 in the third collection tank 73. When a parallel sample needs to be tested a second time, the control module first activates the first switching cylinder 85. The first switching cylinder 85 pushes the first guide 83 to slide. When the discharge pipe 84 connects with the selection port 82 furthest from the body of the first switching cylinder 85, the first switching cylinder 85 stops operating, and the selection port 82 furthest from the body of the first switching cylinder 85 connects with the first material pipe 74. Subsequently, the control module controls the first ball valve to open, and gas is introduced into the first air inlet pipe 77. The gas enters the first collection tank 71, and the sample in the first collection tank 71 flows to the first material pipe 74, and enters the discharge pipe 84 through the selection port 82 connected to the first material pipe 74. The first collection tank 71 is connected to the parallel sample chamber 25 through the first distribution pipe 212. Therefore, the sample flowing out of the discharge pipe 84 at this time is the sample from the parallel sample chamber 25 in the first collection tank 71.This design replaces the two control valves that would normally be located inside the first feed pipe 74 and the third feed pipe 76 with a single control valve located outside the two pipes. This saves on the number of control valves, avoids wasting space and costs, and makes the flow path of the pipes clear at a glance, which is convenient for later maintenance and troubleshooting.

[0044] The cabinet 5 contains a second pipeline switching assembly 9, which includes a second mounting plate 91. The second mounting plate 91 has two air selection ports 92 spaced apart along its width axis. The first air inlet pipe 77 and the third air inlet pipe 79 are respectively connected to the two air selection ports 92. A second guide member 93 is slidably mounted on the upper side of the second mounting plate 91 along its width axis. An air outlet pipe 94, whose lower end face is in contact with the upper side of the second mounting plate 91, passes through the second guide member 93. The end of the air outlet pipe 94 away from the second mounting plate 91 is connected to the negative pressure generating device 62. A second switching cylinder 95, electrically connected to the control module, is fixedly mounted on the second mounting plate 91. The second switching cylinder 95 drives the second guide member 93 to slide, thereby connecting the air outlet pipe 94 to one of the two air selection ports 92. A second ball valve is provided inside the air outlet pipe 94. The telescopic end of the second switching cylinder 95 is fixedly connected to the side wall of the second guide member 93. When sample flow is not required, the control module controls the second ball valve to be closed. Initially, the second switching cylinder 95 is in a retracted state, meaning the second guide 93 is close to the body of the second switching cylinder 95. The outlet pipe 94 connects to the gas selection port 92 closer to the body of the second switching cylinder 95, which in turn connects to the third inlet pipe 79. When testing is required, the control module first controls the second ball valve to open, allowing gas to enter the outlet pipe 94. Since the outlet pipe 94 connects to the third inlet pipe 79, the gas in the outlet pipe 94 enters the third collection tank 73 via the third inlet pipe 79. The sample in the third collection tank 73 flows into the third feed pipe 76 and then out of the third feed pipe 76. When a parallel sample is required for secondary testing, the control module activates the second switching cylinder 95. The second switching cylinder 95 pushes the second guide 93 to slide. Once the outlet pipe 94 connects with the gas selection port 92, which is furthest from the main body of the second switching cylinder 95, the second switching cylinder 95 stops operating. The gas selection port 92 then connects with the first inlet pipe 77, thus connecting the outlet pipe 94 and the first inlet pipe 77. Subsequently, the control module controls the second ball valve to open, allowing gas to enter the outlet pipe 94. Because the outlet pipe 94 is connected to the first inlet pipe 77, the gas in the outlet pipe 94 enters the first collection tank 71 through the first inlet pipe 77. The sample material in the first collection tank 71 flows into the first material pipe 74 and then flows out from the first material pipe 74. In this design, the function of the second pipeline switching component 9 is similar to that of the first pipeline switching component 8, saving on the number of control valves, avoiding space and cost waste, and facilitating subsequent maintenance and troubleshooting.

[0045] The system also includes a dust collection structure 6, which comprises a dust collection tank 61. The aforementioned air outlet pipe 94 is connected to the dust collection tank 61. A negative pressure generating device 62 is fixedly installed around the dust collection tank 61 and is connected to the upper end of the dust collection tank 61. A dust filter element 63 is installed inside the dust collection tank 61. The number of dust filter elements 63 can be increased according to actual needs. A bracket is fixedly installed on the outside of the dust collection tank 61, and the negative pressure generating device 62 is mounted on the bracket. A connecting pipe 64 is connected to the upper end of the dust collection tank 61 and is connected to the negative pressure generating device 62. This design can, to a certain extent, ensure that the gas entering the grain sampling system does not contain too many impurities. Alternatively, one end of the discharge pipe 84 can be connected to a negative pressure device, allowing the sample material in the first collection tank 71 or the third collection tank 73 to enter the dust collection tank 61 through the air outlet pipe 94 under the propulsion of the gas. This design allows for the recovery of the tested sample material, avoiding waste.

[0046] In summary, this application proposes a grain sampling and reduction device and a grain sampling system. This system can reduce the size of mixed grains and divide the mixed sample into three parts—parallel sample, reserve sample, and test sample—using a sampling mechanism 2. This ensures that the quality of the three test samples is similar, thus making the subsequent test results more reliable. Furthermore, a fixed-volume tank 12 is added, allowing the device and system to perform fixed-volume sampling of the mixed sample, better meeting current needs and reducing grain waste. Simultaneously, the system can collect remaining waste materials by switching and reinstalling pipelines, avoiding waste.

Claims

1. A grain sampling and reduction device, comprising a mixing mechanism (1) and a sampling mechanism (2) connected sequentially from top to bottom along the direction of gravity, wherein the mixing mechanism (1) is used to mix grain samples taken multiple times, characterized in that: The sampling mechanism (2) includes a bell-shaped shell (21). The upper end of the bell-shaped shell (21) is provided with a grain inlet (211) that communicates with the mixing mechanism (1). The upper part of the bell-shaped shell (21) is fixedly connected to a support plate (22) by multiple partition plates (23). The side of the bell-shaped shell (21) away from the grain inlet (211) is sealed with a parallel sample chamber (25), a sample preparation chamber (26), and an inspection sample chamber (27). Multiple partition plates (23) are evenly spaced along the circumference of the support plate (22) to form multiple feed grid openings (24). The gate (24) is divided into three groups according to a preset quantity value, which are respectively connected to the parallel sample chamber (25), the preparation sample chamber (26) and the inspection sample chamber (27). A cone (28) is fixedly connected to the side of the support plate (22) near the grain inlet (211). The central axis of the cone (28) is collinear with the central axis of the grain inlet (211). The lower end of the bell shell (21) is detachably provided with a first distribution pipe (212) connected to the parallel sample chamber (25), a second distribution pipe (213) connected to the preparation sample chamber (26) and a third distribution pipe (214) connected to the inspection sample chamber (27).

2. The grain sampling and reduction device as described in claim 1, characterized in that: The support plate (22) is an annular plate, and the bottom diameter of the cone (28) is equal to the outer diameter of the annular plate. The bottom surface of the cone (28) is provided with a weight reduction groove (281).

3. The grain sampling and reduction device as described in claim 1, characterized in that: The mixing mechanism (1) includes a separation sample chamber (11), which includes a chamber body (111). The upper end of the chamber body (111) is provided with an opening (1111). The opening (1111) is fitted with a first sample funnel (112). The first sample funnel (112) is connected to a second sample funnel (113) located inside the chamber body (111). A rotating shaft (114) is provided inside the chamber body (111) below the outlet of the second sample funnel (113). A material distribution plate (115) is fixedly sleeved on the rotating shaft (114). The material distribution plate (115) divides the lower part of the chamber body (111) into two grain chambers. The lower end of the chamber body (111) is provided with a grain shrinking pipe (117) and a grain return pipe (116) that are respectively connected to the two grain chambers. The grain shrinking pipe (117) is connected to the grain inlet (211).

4. The grain sampling and reduction device as described in claim 3, characterized in that: A fixed-volume tank (12) is connected between the separation sample chamber (11) and the bell and tripod shell (21). The upper end of the fixed-volume tank (12) is connected to the grain shrinkage pipe (117), and the lower end is connected to the grain inlet (211). A slide valve assembly (13) is provided between the fixed-volume tank (12) and the grain inlet (211). A residual material pipe (14) is connected to the upper end of the fixed-volume tank (12) on its circumference. The residual material pipe (14) is inclined and the angle between its central axis and the central axis of the fixed-volume tank (12) is acute. The higher end of the residual material pipe (14) in the direction of gravity is connected to the fixed-volume tank (12), and the lower end is connected to the side wall of the grain return pipe (116).

5. The grain sampling and reduction device as described in claim 4, characterized in that: The slide gate valve assembly (13) includes a slide gate valve body (131) disposed between the fixed volume tank (12) and the bell shell (21). The slide gate valve body (131) has a flow port (1311). A pair of slide gate valve side plates (132) are disposed between the slide gate valve body (131) and the fixed volume tank (12), respectively located on both sides of the flow port (1311). The pair of slide gate valve side plates (132) are arranged opposite to each other to form a slide gate channel (133). A slide plate (134) for closing or opening the flow port (1311) is reciprocatingly slid in the slide gate channel (133).

6. The grain sampling and reduction device as described in claim 5, characterized in that: The angle between the central axis of the residual material pipe (14) and the central axis of the constant volume tank (12) is 45 degrees.

7. A grain sampling system, comprising a control module and a sampler (4) electrically connected to the control module, characterized in that: The system includes a cabinet (5) and a negative pressure generating device (62) disposed within the cabinet (5). The cabinet (5) is equipped with a grain sampling and reduction device as described in any one of claims 1-6. Both the negative pressure generating device (62) and the grain sampling and reduction device are electrically connected to the control module. The cabinet (5) is equipped with a material collection tank assembly (7). The material collection tank assembly (7) includes a first material collection tank (71) connected to the first material distribution pipe (212) and a second material collection tank connected to the second material distribution pipe (213). (72) and the third collection tank (73) connected to the third distribution pipe (214), the lower end of the first collection tank (71) is connected to the first material pipe (74) and the first air inlet pipe (77), the lower end of the second collection tank (72) is connected to the second material pipe (75) and the second air inlet pipe (78), the lower end of the third collection tank (73) is connected to the third material pipe (76) and the third air inlet pipe (79), and the first air inlet pipe (77) and the third air inlet pipe (79) are both connected to the negative pressure generating device (62).

8. The grain sampling system as described in claim 7, characterized in that: The cabinet (5) is provided with a first pipeline switching assembly (8). The first pipeline switching assembly (8) includes a first mounting plate (81). The first mounting plate (81) has two material selection ports (82) spaced apart along its width axis. The first material pipe (74) and the third material pipe (76) are respectively connected to the two material selection ports (82). The upper side of the first mounting plate (81) is provided with a first guide (83) along its width axis. The first guide (83) is provided with a discharge pipe (84) whose lower end face is attached to the upper side of the first mounting plate (81). The first mounting plate (81) is fixedly installed with a first switching cylinder (85) electrically connected to the control module. The first switching cylinder (85) is used to drive the first guide (83) to slide, thereby making the discharge pipe (84) connected to one of the two material selection ports (82). The discharge pipe (84) is provided with a first ball valve.

9. The grain sampling system as described in claim 8, characterized in that: The cabinet (5) is equipped with a second pipeline switching assembly (9), which includes a second mounting plate (91). The second mounting plate (91) has two air selection ports (92) spaced apart along its width axis. The first air inlet pipe (77) and the third air inlet pipe (79) are respectively connected to the two air selection ports (92). A second guide (93) is slidably provided on the upper side of the second mounting plate (91) along its width axis. The second guide (93) has a lower end through it. An air outlet pipe (94) is attached to the upper side of the second mounting plate (91). One end of the air outlet pipe (94) away from the second mounting plate (91) is connected to the negative pressure generating device (62). The second mounting plate (91) is fixedly mounted with a second switching cylinder (95) that is electrically connected to the control module. The second switching cylinder (95) is used to drive the second guide (93) to slide, thereby making the air outlet pipe (94) connected to one of the two air selection ports (92). A second ball valve is provided inside the air outlet pipe (94).

10. The grain sampling system as described in claim 9, characterized in that: It also includes a dust collection structure (6), which includes a dust collection tank (61). The air outlet pipe (94) is connected to the dust collection tank (61). The negative pressure generating device (62) is fixedly installed on the circumference of the dust collection tank (61). The negative pressure generating device (62) is connected to the upper end of the dust collection tank (61). The dust collection tank (61) is provided with a dust filter element (63).

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