Layered sampling probe rod and rotary drilling equipment for grain vertical cylinder warehouse

Abstract

The invention relates to the technical field of grain storage, in particular to a layered sampling probe rod of a grain vertical barrel warehouse and rotary drilling equipment. Comprising a plurality of sections of stratified sampling pipes which are detachably and hermetically connected to form a communicating pipe body for extending into a grain pile; the stratified sampling pipe can be communicated with an external negative pressure pump; and the stratified sampling pipe is drilled into a grain pile through external rotating-in equipment. According to the sampling equipment, the negative pressure effect is fully utilized, self-driving and self-control in the whole sampling process are achieved, the negative pressure serves as power to drive the sampling pipe to stretch out and adsorb grains and also serves as a control signal, when the grains block the filter screen and cause negative pressure change, the sampling pipe is automatically triggered to reset and seal through a pure mechanical linkage mechanism, and the sampling effect is achieved. Therefore, deep stratified sampling can be efficiently and reliably completed only through a single negative pressure source, the structure is compact, and external control is not needed.

Description

Technical Field

[0001] This invention relates to the field of grain storage technology, and more specifically, to a layered sampling probe and rotary drilling equipment for a vertical grain warehouse. Background Technology

[0002] Vertical silos, as the core facility of modern intensive grain storage, maximize storage capacity per unit area with their storage depth of tens of meters. However, it is precisely this deep structure that leads to a much greater vertical heterogeneity in grain quality distribution within the silo compared to other silo types. Due to the high stacking height of the grain, a stable temperature gradient and moisture migration channel form within the silo. This makes the upper layer of grain susceptible to fluctuations in external temperature and humidity, the middle layer a high-risk area for mold growth due to heat and moisture accumulation, and the bottom layer of grain undergoes polarization under long-term, immense static pressure, forming a layer that hinders gas and moisture exchange. This stratification effect directly caused by depth means that the sampling results from any single layer cannot represent the true storage condition of the entire silo. Therefore, stratified sampling of vertical silos by depth sequence is not just an optimal choice, but a fundamental prerequisite for accurately assessing grain storage safety.

[0003] Currently, deep sampling operations in vertical silos still commonly employ a single sampling tube for sequential sampling. This involves inserting a sampling tube, sometimes tens of meters long, into the grain pile all at once or in sections. After sampling at a specific depth, the entire tube must be removed from the silo to retrieve the sample, and then the tube is reinserted for the next depth. This method is not only inefficient and labor-intensive, but more importantly, its "single-tube sequential operation" is fundamentally incompatible with the "three-dimensional, layered" mass distribution characteristics of vertical silos. 1. Lack of synchronization: The time difference between multiple tube samplings makes it impossible to capture the dynamic changes in grain conditions at different depths at the same time section; 2. Disruption of representativeness: The repeated insertion and removal process severely disturbs the original structure of the grain pile and causes cross-contamination of samples at different depths during the lifting process, causing the samples to lose their "original" representativeness. 3. Efficiency bottleneck: When operating at depths of tens of meters, sequential sampling takes too long and cannot meet the needs of rapid screening of large-scale grain conditions.

[0004] A search revealed that existing sampling equipment primarily focuses on improving the efficiency, reliability, or ease of operation of single-point sampling (e.g., sampling equipment with publication numbers CN109342114B and CN109738226B mainly involves anti-clogging and automated control of the sampling machine; sampling equipment disclosed in CN216746902U and CN220120457U emphasizes the portability and structural optimization of the sampling device). However, these technical solutions essentially still adhere to the traditional "single-tube sequential operation" model, meaning that a single sampling tube can only obtain a sample from one specific point in a single operation. For the deep, multi-point sampling needs of vertical silos, it is still necessary to achieve this through repetitive and cumbersome "tube lowering-sampling-tube lifting" cyclical operations, which cannot fundamentally solve the core problems of low operational efficiency, the risk of cross-contamination of samples, and the inability to accurately reflect the distribution of grain quality at different depths at the same time cross-section. Currently, no patents or documents disclose a specialized device capable of deploying multiple sampling units at once and simultaneously and independently completing the collection, separation, and preservation of samples at a series of preset depth points within the chamber during a single deployment. Therefore, the applicant has invented a sampling probe and rotary drilling device capable of achieving truly synchronous stratified sampling. Summary of the Invention

[0005] The purpose of this invention is to provide a layered sampling probe and rotary drilling device for a grain vertical warehouse. This sampling device makes full use of negative pressure to achieve self-drive and self-control of the entire sampling process: negative pressure serves as both a power source to drive the sampling tube to extend and adsorb grain, and a control signal. When grain clogs the filter screen, causing a change in negative pressure, the sampling tube is automatically triggered to reset and seal through a purely mechanical linkage mechanism. Thus, deep layered sampling is completed efficiently and reliably with only a single negative pressure source. The structure is compact and requires no external control.

[0006] The present invention is implemented as follows: a layered sampling probe for a grain vertical warehouse includes multiple layers of sampling tubes, which are detachably and sealed to form a connecting tube for extending into the grain pile; the layered sampling tubes can be connected to an external negative pressure pump; the layered sampling tubes are drilled into the grain pile through an external transfer device. The stratified sampling tube includes a probe tube and a negative pressure tube. The negative pressure tube is installed inside the probe tube and can be connected to an external negative pressure pump. A filter screen is embedded in the side wall of the negative pressure tube, and a sampling mechanism is set between the filter screen and the probe tube. The sampling mechanism uses the negative pressure in the negative pressure tube to take samples and automatically closes the feed hole when the negative pressure changes due to grain blockage of the filter screen.

[0007] Furthermore, the filter screen embedded in the negative pressure tube forms an annular sampling chamber between itself and the inner wall of the probe. When negative pressure is generated in the sampling chamber, the sampling mechanism opens and samples are taken. When the negative pressure in the sampling chamber changes due to grain blockage, the sampling mechanism closes.

[0008] Furthermore, the sampling mechanism is a duckbill valve fixedly installed on the side wall of the probe, and the conduction direction of the duckbill valve is such that grain can only flow into the sampling chamber from the outside of the probe.

[0009] Furthermore, the sampling mechanism is an elastic one-way valve installed on the side wall of the probe tube, and the conduction direction of the elastic one-way valve is such that grain is allowed to flow into the sampling chamber only from the outside of the probe tube.

[0010] Furthermore, the sampling mechanism includes a sliding ring, a negative pressure transmission mechanism, a three-way valve, a pressure sensor, and three connecting pipes; the sliding ring is slidably sleeved on the outer wall of the probe and can block the feed hole, and the top of the sliding ring is connected to the negative pressure transmission mechanism; the common end of the three-way valve is connected to the negative pressure transmission mechanism through a connecting pipe, and the two reversing ends of the three-way valve are connected to the negative pressure tube and the outside of the sampling chamber through connecting pipes respectively.

[0011] Furthermore, the sampling mechanism includes a sampling tube, a transmission device, and a negative pressure transmission mechanism; the sampling tube is a telescopic tube, and a sampling port is opened on the side wall of the sampling end of the sampling tube; the transmission device is connected to both the sliding section of the sampling tube and the negative pressure transmission mechanism; the transmission device transmits the power output end of the negative pressure transmission mechanism to the sliding section of the sampling tube; the fixed end of the sampling tube is connected to the negative pressure transmission mechanism, and a sampling chamber is formed between the sampling tube and the two layers of filter screens in the negative pressure transmission mechanism.

[0012] Furthermore, the transmission device includes a gear and an arc-shaped sealing plate; the outer wall of the sliding section of the sampling tube is a toothed surface, the arc-shaped sealing plate is fixedly connected to the power output end of the negative pressure transmission mechanism, and the outer wall of the arc-shaped sealing plate is also a toothed surface; the gear meshes with both the toothed surface of the arc-shaped sealing plate and the toothed surface of the sampling tube.

[0013] Furthermore, the sampling mechanism includes a second sampling tube, a filter cylinder, a transmission rod, a second baffle, a fourth spring, a slider, and a negative pressure transmission mechanism; the feed hole of the second sampling tube is hinged with an opening and closing plate, and the second sampling tube is connected to the power output end of the negative pressure transmission mechanism through the transmission rod; the filter cylinder is embedded in the fixed section of the second sampling tube. A vertical through groove is provided on the side wall of the probe. The slider is slidably disposed on the outer side wall of the probe, and the baffle is slidably disposed on the inner side wall of the probe. The side wall of the slider passes through the through groove and is connected to the baffle. The top of the baffle is fixedly connected to the spring, and the top of the spring is fixedly connected to the inner side wall of the probe.

[0014] Furthermore, the negative pressure transmission mechanism includes a drive tube, a spring, and a piston; the drive tube is fixedly installed inside the probe tube, one end of the spring is fixedly connected to the inner end of the drive tube, the other end of the spring is fixedly connected to the piston, and the piston is sealed and slidably disposed inside the drive tube.

[0015] The present invention also provides a rotary drilling device for a grain vertical storage warehouse, including a device body, a rotary drilling mechanism on the device body, a rotatable hollow connector on the power output end of the rotary drilling mechanism, the discharge end of the connector being threaded to the probe tube in claim 1, and automatically connected to the negative pressure pipe in claim 1 during connection; a negative pressure connecting pipe is rotatably provided on the top of the connector, and the negative pressure connecting pipe can be externally connected to a negative pressure pump; the rotary drilling mechanism can drive the connector to drive the layered sampling probe to rotate and cut into the grain pile.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The sampling probe of this application combines the "dynamic action" and "state signal" of negative pressure into one. It not only uses negative pressure to drive the sampling mechanism and adsorb grain, but also creatively utilizes the physical phenomenon of negative pressure change caused by filter blockage after sampling as a control signal to trigger the automatic reset and sealing of the mechanism. This achieves self-drive and self-control of the entire "open-sampling-close" process. This fundamental improvement allows the sampling probe to simultaneously and independently collect and preserve multiple original grain samples at different depths in the vertical silo in a single drop. It fundamentally solves the core problems of low operating efficiency, cross-contamination of samples, and inability to accurately reflect the vertical distribution of grain conditions at the same time section in traditional single-tube sequential sampling methods, providing a reliable technical means for accurately assessing grain storage safety. 2. The sampling mechanism of this invention adopts a simple mechanical check valve, such as a duckbill valve or an elastic check valve. It achieves a normally closed seal by relying on the elasticity of the valve body or the pre-tightening force of the internal spring, which fundamentally eliminates cross-contamination between samples. This structural design is sensitive to changes in negative pressure and has reliable operation. It does not require any external control and can automatically complete the opening and closing by relying solely on the changes in negative pressure in the sampling chamber, realizing a truly passive intelligent control. At the same time, the valve body structure is simple, low in cost, and durable, which greatly improves the reliability and economy of the sampling probe. 3. The sampling process is made precise through the coordinated control of a three-way valve and a pressure sensor. When the pressure in the sampling chamber increases due to filter blockage, the pressure sensor monitors this change in real time and sends a signal to control the three-way valve to automatically switch to a negative pressure air path. This causes the negative pressure transmission mechanism to drive the sliding ring to quickly close the feed hole, thus accurately terminating the sampling. This structure, through the closed-loop linkage of pressure sensor feedback and air path control, effectively avoids the problem of excessive or insufficient sampling caused by the uncertainty of grain flow, significantly improving the consistency and reliability of sampling. It is particularly suitable for applications requiring high sampling accuracy. 4. The sampling probe of this application achieves a high degree of automation and reliability in the sampling process by integrating the sampling tube with a telescopic structure and a negative pressure transmission mechanism. This design enables the equipment to automatically complete the entire process of opening the sampling port, sampling operation, and sealing closure, significantly improving sampling efficiency. Simultaneously, the integrated structure effectively avoids cross-contamination between samples from different depths, ensuring the accuracy of sampling results. It is particularly suitable for deep grain sampling in vertical silos where high sealing and operational reliability are required. Attached Figure Description

[0017] Figure 1 These are schematic diagrams of the structure of the layered sampling probe provided in Embodiments 1 and 6 of the present invention when used in conjunction with a rotary drilling device; Figure 2 This is a schematic diagram of the structure of a layered sampling probe for a grain vertical warehouse provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure after the two layered sampling probes are connected, as provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of a layered sampling probe for a grain vertical warehouse provided in Embodiment 2 of the present invention; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the structure of a layered sampling probe for a vertical grain warehouse provided in Embodiment 3 of the present invention; Figure 7 yes Figure 6 Cross-sectional view of AA; Figure 8 yes Figure 6 Enlarged view of point B in the middle; Figure 9 This is a schematic diagram of the structure of a layered sampling probe for a grain vertical warehouse provided in Embodiment 4 of the present invention; Figure 10 yes Figure 9 Enlarged view of point A in the middle; Figure 11 This is a schematic diagram of the structure of a layered sampling probe for a grain vertical warehouse provided in Embodiment 5 of the present invention (before sampling); Figure 12 yes Figure 11 Enlarged view of point A in the middle; Figure 13 yes Figure 11 Enlarged view of point B in the middle; Figure 14 This is a schematic diagram of the structure of a layered sampling probe for a vertical grain warehouse provided in Embodiment 5 of the present invention (during sampling). Figure 15 yes Figure 14 Enlarged view of point A in the middle.

[0018] Reference numerals used in the above figures: 1. Probe; 2. Negative pressure pipe; 3. Drive motor; 4. Transmission wheel; 5. Power transmission belt; 6. Negative pressure connecting pipe; 7. Servo motor; 8. Lifting plate; 9. Threaded rod; 10. Support frame; 11. Filter screen; 12. Duckbill valve; 13. Filter plate; 14. Baffle one; 15. Spring one; 16. Feed hole; 17. Sliding ring; 18. Slide groove; 19. Stepper motor; 20. Rotating ball; 21. 21. Drive tube; 22. Spring 2; 23. Piston; 24. Spherical shell; 25. Connecting tube; 26. L-shaped channel; 27. Pressure sensor; 28. Arc-shaped sealing plate; 29. ​​Sampling tube 1; 30. Gear; 31. Transmission rod; 32. Baffle 2; 33. Opening and closing plate; 34. Sampling tube 2; 35. Filter cartridge; 36. Through hole; 37. Spring 3; 38. Slider; 39. Through groove; 40. Connector. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0021] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Reference Figure 1-15 The image shown is a preferred embodiment of the present invention.

[0023] Example 1: A stratified sampling probe for a grain vertical storage warehouse, consisting of at least one stratified sampling tube. For example... Figure 1 and Figure 2As shown, the stratified sampling tube mainly consists of a probe tube 1 and a negative pressure tube 2, with the negative pressure tube 2 coaxially nested inside the probe tube 1. To facilitate the connection of multiple probe sections, this embodiment features a special design at both ends of the probe tube 1: its top end is a threaded opening, and its bottom end is a constricted shape matching its shape and size, with threads also present on the outer wall. Figure 3 As shown, the mechanical connection between the two probe sections is achieved by screwing the constricted section of the probe 1 of one layered sampling tube into the top opening of another. After connection, the internal negative pressure tubes 2 will automatically align, forming a continuous negative pressure channel. Furthermore, to prevent grain from entering the negative pressure tube 2 from the bottom during insertion of the sampling probe into the grain pile, a filter plate 13 is installed at the bottom of the negative pressure tube 2 of each layered sampling tube. This design also eliminates the need to distinguish the order of connection between the layers of sampling tubes, significantly improving the convenience and efficiency of on-site assembly.

[0024] The sampling probe of this embodiment is drilled into the grain pile using the rotary drilling equipment described in Embodiment 6. The specific connection method will be described in detail in Embodiment 6.

[0025] In this structure, a filter screen 11 is embedded in the negative pressure tube 2. The filter screen 11 is located between two annular sealing plates (not shown in the figure) inside the probe tube 1, thus forming a closed sampling chamber enclosed by the sealing plates, the filter screen 11, and the inner wall of the probe tube 1. A sampling mechanism is fixedly installed on the side wall of the probe tube 1. In this embodiment, the sampling mechanism is preferably a duckbill valve 12, with its flat end located inside the sampling chamber. When the sampling chamber forms a negative pressure state under the action of negative pressure, the duckbill valve 12 opens, and the grain sample at the corresponding depth is sucked into the sampling chamber. As the filter screen 11 gradually becomes clogged due to the adsorption of grain, the negative pressure in the sampling chamber weakens, and the duckbill valve 12 closes, thereby automatically completing a single sampling operation.

[0026] When the probe is fully inserted into the grain pile, the filter plate 13 at its bottom becomes clogged with grain. Given that the silo depth can reach over ten meters, the length of the entire sampling probe is correspondingly extended. After the negative pressure pump starts, the negative pressure will generate significant friction loss in the through-type negative pressure pipe 2. This phenomenon results in the highest negative pressure intensity in the sampling chamber closest to the negative pressure pump, enabling it to preferentially and quickly absorb the grain to its full capacity. After this chamber is full, the negative pressure will be effectively transferred to the next sampling chamber, and so on. This through-type negative pressure pipe 2 design ensures that each sampling chamber can independently sample grain at different depths while achieving sequential utilization of negative pressure energy, effectively reducing the overall power requirements of the negative pressure pump and achieving energy-saving effects.

[0027] Working Principle: When using this sampling probe for stratified sampling, the first section of the stratified sampling tube is first installed on the rotary drilling equipment, which drives it to rotate and drill into the grain pile. Then, the next section of the stratified sampling tube is placed in the pushing position of the equipment. During downward advancement, it automatically connects and locks with the previous section via threads. This process is repeated until the entire sampling probe is inserted to the predetermined depth. After deployment, the negative pressure pump is started. Due to friction resistance within the negative pressure tube 2, the sampling chamber closest to the pump will first establish the strongest negative pressure and quickly fill with grain under its adsorption effect. When this chamber is full and the filter 11 becomes clogged, causing a drop in negative pressure, the negative pressure effect will be transmitted step by step, allowing subsequent sampling chambers to complete sampling sequentially. After sampling, the rotary drilling equipment drives the entire sampling probe to rotate in the opposite direction, withdrawing it section by section from the grain pile. Workers then use a circular tube inserted into each section's duckbill valve 12 to retrieve the original samples at different depths.

[0028] Example 2: A layered sampling probe for grain silos, such as... Figure 4 and Figure 5 As shown, this embodiment provides a new sampling mechanism compared to Embodiment 1. This mechanism mainly consists of a baffle 14 and a spring 15, and is disposed within the sampling chamber of the probe 1. To prevent the spring from interfering with the smooth entry of grain, this embodiment places it outside the feed inlet: one end of the spring 15 is fixedly connected to the baffle 14, and the other end is fixed to the inner wall of the probe 1. Under normal conditions, the preload of the spring 15 keeps the baffle 14 closed, reliably sealing the feed inlet. When the negative pressure within the sampling chamber is sufficient to overcome the force of the spring 15, the baffle 14 is adsorbed and opened, allowing the grain to enter the sampling chamber under negative pressure. After sampling, the operator can use a rod to slightly push open the baffle 14 to smoothly remove the grain sample sealed within the sampling chamber.

[0029] Example 3: A layered sampling probe for a grain vertical storage warehouse, such as... Figures 6-8 As shown. The difference between this embodiment and Embodiment 1 and Embodiment 2 is that it provides a novel sampling mechanism that uses an electronic control method to precisely control the sampling amount.

[0030] The sampling mechanism mainly consists of a sliding ring 17, a negative pressure transmission mechanism, a three-way valve, a pressure sensor 27, and three connecting pipes 25. To maintain a smooth outer wall without protrusions on the probe 1, this embodiment features an annular groove 18 on the outer wall of the probe 1. Figure 7 The sliding ring 17 is sleeved on the outside of the probe 1 and placed in the groove 18, with its outer surface flush with the outer wall of the probe 1. In the initial state, the sliding ring 17 is located at the bottom of the groove 18 under the action of the negative pressure transmission mechanism, closing the feed hole 16. The top of the sliding ring 17 is fixedly connected to the power output end of the negative pressure transmission mechanism through multiple connecting rods.

[0031] like Figure 8 As shown, the negative pressure transmission mechanism mainly consists of an annular drive tube 21, a second spring 22, and a piston 23. The annular drive tube 21 is embedded in the side wall of the probe 1, and the annular piston 23 is slidably disposed within the drive tube 21. The top of the piston 23 is connected to the second spring 22, and the top of the second spring 22 is fixed to the top of the drive tube 21; the bottom of the piston 23 is fixed to the connecting rod, and the connecting rod maintains a sealed sliding contact with the bottom of the drive tube 21. When the piston 23 moves within the drive tube 21, it can drive the sliding ring 17 to slide up and down through the connecting rod, thereby opening and closing the feed hole 16.

[0032] The three-way valve is used to control the direction of movement of piston 23. Specifically, one connecting pipe 25 connects the drive pipe 21 to the common end of the three-way valve, and the other two connecting pipes 25 connect the two reversing ends of the three-way valve to the negative pressure pipe 2 and the outside of the sampling chamber, respectively. A pressure sensor 27 is installed in the sampling chamber, and a controller is configured in each section of the layered sampling pipe. By monitoring the real-time pressure in the sampling chamber, the controller can adjust the connection direction of the three-way valve accordingly. To protect the pressure sensor 27 from interference from grain contact, in this embodiment, it is installed together with the rotating ball 20 in the electrical control box, and the electrical control box is connected to the sampling chamber through the filter plate 13.

[0033] The specific structure of the three-way valve is as follows: Figure 8 As shown, it mainly consists of a spherical shell 24, a rotating ball 20, and a stepper motor 19. The rotating ball 20 is rotatably mounted inside the spherical shell 24, and the output end of the stepper motor 19 is connected to the rotating ball 20. An L-shaped channel 26 is opened inside the rotating ball 20. One end of this channel is always connected to the drive tube 21, forming the common end of the three-way valve; the other end can be connected to the negative pressure tube 2 or the outside of the sampling chamber when the rotating ball 20 rotates, forming two reversing ends.

[0034] Working principle: When the sampling probe is fully inserted into the grain pile, the piston 23 is positioned at the bottom of the drive tube 21 under the elastic force of the spring 22. At this time, the sliding ring 17 closes all feed holes 16. Simultaneously, the L-shaped channel 26 inside the rotating ball 20 connects the drive tube 21 with the negative pressure tube 2. After the negative pressure pump starts, a negative pressure is formed in the drive tube 21, pushing the piston 23 upward against the spring force. This, in turn, drives the sliding ring 17 upward via the connecting rod, opening the feed holes 16. At this time, the sampling chamber is connected to the negative pressure tube 2 through the filter 11 and is in a negative pressure state, and the grain is sucked into the sampling chamber. As the filter 11 is gradually covered by grain, the negative pressure intensity in the sampling chamber weakens, and the pressure sensor 27 transmits a signal to the controller. The controller then drives the stepper motor 19 to rotate, causing the L-shaped channel 26 to switch to connect the drive tube 21 with the outside of the sampling chamber. The negative pressure inside the drive tube 21 decreases accordingly, and the piston 23 moves downward under the action of the spring 22. It also drives the sliding ring 17 to move downward through the connecting rod, re-sealing the feed hole 16, thereby completing one sampling operation.

[0035] Example 4: A layered sampling probe for a grain vertical warehouse, such as... Figure 9 and Figure 10 As shown. Compared to embodiments 1-3, this embodiment provides a novel sampling mechanism that can actively extend and insert into a grain pile at a specified depth for sampling. The mechanism mainly consists of a sampling tube 29, a transmission device, and a negative pressure transmission mechanism.

[0036] The sampling tube 29 is designed as a telescopic tube structure, with its telescopic section sealed and slidingly fitted onto the outside of the fixed section. For example... Figure 10 As shown, the sampling tube 29 has a sampling port on its side wall near the end, and the fixed section is fixedly connected to the outer wall of the negative pressure tube 2. In the initial state, most of the sampling port is located inside the side wall of the probe tube 1, with only a small part exposed inside the probe tube 1. During sampling, the sampling tube 29 extends outward, exposing part of the sampling port to the outside of the probe tube 1. Since a small part of the sampling port is exposed inside the probe tube 1 when the sampling tube 29 returns to its initial position after sampling, this structure is suitable for sampling operations of grains with larger particle sizes (such as corn, soybeans, etc.).

[0037] The negative pressure transmission mechanism used in this embodiment is the same as that in Embodiment 3, including a drive tube 21, a second spring 22, and a piston 23. The drive tube 21 is a cylindrical pipe, and its sidewall is connected to the fixed section of the sampling tube 29 via a conduit. The piston 23 and the second spring 22 are installed at the end of the drive tube 21 away from the filter screen 11. To prevent the grain sample from contacting the piston 23, two layers of filter screens 11 are provided on the drive tube 21, with the space between them connected to the conduit.

[0038] To drive the piston 23 to the telescopic section of the sampling tube 29, this embodiment includes a transmission device, mainly comprising a gear 30 and an arc-shaped sealing plate 28. The arc-shaped sealing plate 28 is fitted to the outer wall of the drive tube 21, and the side wall of the piston 23 passes through the strip groove on the drive tube 21 and is fixed to the arc-shaped sealing plate 28. When the piston 23 moves, the sealing of the drive tube 21 can still be maintained under the action of the arc-shaped sealing plate 28.

[0039] Both the outer wall of the sampling tube 29 and the outer wall of the arc-shaped sealing plate 28 are toothed, and both mesh with a gear 30. The gear 30 is rotatably mounted on a fixed bracket to ensure transmission stability. When the piston 23 moves towards the negative pressure tube 2 under negative pressure, the arc-shaped sealing plate 28 moves accordingly, driving the telescopic section of the sampling tube 29 to extend outward through the gear 30, gradually exposing the sampling port and realizing the sampling operation.

[0040] In order to make the sampling tube 29 easier to insert into the grain pile, the end of the sampling tube 29 is set as a pointed tip in this embodiment.

[0041] Working Principle: When the sampling probe is fully inserted into the grain pile and the negative pressure pump is activated, the pressure inside the drive tube 21 decreases, creating a negative pressure. At this time, the sampling port of the sampling tube 29 is exposed inside the probe 1, and the gas in the probe 1 is drawn into the sampling tube 29. The piston 23, under the influence of the negative pressure, moves the arc-shaped sealing plate 28 towards the negative pressure tube 2. The arc-shaped sealing plate 28, through gear 30, pushes the sampling tube 29 outward from the probe 1, exposing the sampling port to the external grain pile. As the sampling port is exposed, the negative pressure inside the sampling tube 29 increases, drawing external grain into the tube. When the grain accumulates to the point of clogging the filter screen 11, the negative pressure inside the drive tube 21 decreases, and the piston 23, under the tension of the spring 22, resets, causing the arc-shaped sealing plate 28 to retract. This, in turn, through gear 30, causes the sampling tube 29 to retract to its initial position. Because the sampling port has a limited exposed area, it effectively prevents grain from falling into the cavity of the probe tube 1, ensuring accurate sampling and no cross-contamination. The sampling tube 29 is made of metal. After sampling, the sampling tube 29 can be pulled outwards using a magnet to pour out the grain sample.

[0042] Example 5: A layered sampling probe for a grain vertical storage warehouse, such as... Figures 11 to 13 As shown. This embodiment further optimizes the stability and sealing performance of the sampling process based on embodiment 4. The sampling tube 34 used in this embodiment is also a telescopic tube structure. To prevent grain from entering the tube during the insertion of the sampling probe, an opening and closing plate 33 is hinged at the end of the sampling tube 34. The transmission device adopts a transmission rod 31 structure, with its two ends connected to the telescopic section of the sampling tube 34 and the negative pressure transmission mechanism, respectively.

[0043] The negative pressure transmission mechanism is the same as in Embodiment 4, consisting of a piston 23, a second spring 22, and a drive tube 21. The drive tube 21 is fixedly sleeved on the fixed section of the second sampling tube 34, and the end of the transmission rod 31 is fixedly connected to the piston 23. A filter cartridge 35 is embedded in the second sampling tube 34, enabling internal communication between the drive tube 21 and the second sampling tube 34. The drive tube 21 is connected to the negative pressure tube 2 through multiple through holes 36, and a filter screen 11 is installed at each through hole 36, thereby forming a series negative pressure air path together with the through holes 36, the drive tube 21, and the second sampling tube 34.

[0044] In order to seal the sampling tube 234 after sampling is completed, combined with Figure 11 and Figure 13As shown, a slider 38 is slidably mounted on the side wall of probe 1, and a vertical through groove 39 is formed on the side wall of probe 1. The connecting end of slider 38 passes through the through groove 39 and is fixedly connected to baffle 32. The top of baffle 32 is connected to the end of spring 37, and the other end of spring 37 is fixedly connected to a protrusion on the inner side wall of probe 1. In the initial state, the bottom of baffle 32 is in contact with the outer wall of the telescopic section of sampling tube 34 and is subjected to the elastic force of spring 37. When the telescopic section of sampling tube 34 slides into the inside of probe 1, baffle 32 moves downward under the action of spring 37 and blocks the opening of sampling tube 34.

[0045] Working principle: When the sampling probe is inserted into the grain pile and the negative pressure pump is started, the opening and closing plate 33 will open under the action of negative pressure, and the grain sample at the specified depth will enter the sampling tube 34. When the grain sample blocks the filter cartridge 35, the piston 23 will move towards the through hole 36 under the action of negative pressure, and compress the spring 22. Through the transmission rod 31, the telescopic section of the sampling tube 34 will slide towards the through hole 36. When the side wall of the sampling tube 34 separates from the baffle 32, the baffle 32 will move downward under the elastic force of the spring 37 and block the sampling tube 34. Figure 15 Once sampling is complete, the baffle 32 can be separated from the sampling tube 34 by moving the slider 38 upwards. The sampling tube 34 will then return to its initial position under the elastic force of the spring 22. The operator can then open the opening and closing plate 33 to take the sample.

[0046] It should be noted that any sampling mechanism that uses the principle of negative pressure adsorption for sampling and uses the change in negative pressure caused by the blockage of the filter 11 by grain as a trigger signal to automatically close the feed inlet, regardless of its specific structure, should be considered to fall within the protection scope of the claims of this application.

[0047] Example 6: A rotary drilling device for a grain vertical storage warehouse, used to drill the sampling probe of any one of Examples 1 to 5 into the grain pile. The device includes a main body, such as... Figure 1 As shown, the main body of the equipment consists of a support frame 10 and a lifting plate 8. A rotary drilling mechanism is installed on the main body of the equipment, which consists of a lifting device and a rotary drive device.

[0048] The lifting device mainly includes a servo motor 7 and a threaded rod 9. The servo motor 7 is fixedly mounted on the support frame 10. The threaded rod 9 is vertically arranged, with its top end fixedly connected to the output end of the servo motor 7 and its bottom end rotatably connected to the support frame 10. The lifting plate 8 is sleeved on the threaded rod 9 and can move vertically under the drive of the servo motor 7. It should be noted that any lifting device that can realize the movement of the lifting plate 8 along the height direction, regardless of whether it adopts the threaded transmission method described in this embodiment or other equivalent methods such as hydraulic or chain transmission, falls within the protection scope claimed by the claims of this application.

[0049] A connector 40 is rotatably mounted through the lifting plate 8, and this connector 40 is driven to rotate by a rotary drive device. In this embodiment, the rotary drive device mainly includes a drive motor 3, two transmission wheels 4, and a power transmission belt 5. The drive motor 3 is embedded in the lifting plate 8, one of the transmission wheels 4 is fixed to the output shaft of the drive motor 3, and the other transmission wheel 4 is fixedly sleeved on the outside of the connector 40. The power transmission belt 5 is sleeved on the two transmission wheels 4, thereby transmitting power to the connector 40. It should be noted that any rotary drive device with any structure capable of driving the connector 40 to rotate falls within the scope of protection claimed in this application.

[0050] It should be further noted that the connector 40 in this embodiment has a hollow structure and its bottom sidewall is threaded, so that it can be screwed into the threaded hole at the top of the probe tube 1 of the sampling probe. The top of the connector 40 is rotatably connected to a negative pressure connecting pipe 6, which can be connected to a negative pressure pump through a flexible hose to realize the negative pressure supply during the sampling process.

[0051] Working principle: When inserting the stratified sampling tube into the grain pile, first screw the top of the probe 1 onto the threaded section at the bottom of the connector 40, and secure the connection by rotating the connector 40. Then, start the servo motor 7, driving the lifting plate 8 to move the entire stratified sampling tube downwards and drill into the grain pile. After inserting this section of the sampling tube, reverse the rotation of the drive motor 3 or manually reverse the connector 40 to separate it from the sampling tube. When it is necessary to connect the next section of the sampling tube, screw the constricted end of the new section into the threaded hole at the top of the already installed sampling tube. Again, through the coordinated action of the drive motor 3 and the servo motor 7, the new section of the sampling tube is drilled into the grain pile and secured. Repeating the above steps completes the installation of the entire sampling probe.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A layered sampling probe for a grain vertical storage warehouse, characterized in that, It includes multiple tiered sampling tubes, which are detachably and sealed together to form a connecting tube for extending into the grain pile; the tiered sampling tubes can be connected to an external negative pressure pump; the tiered sampling tubes are drilled into the grain pile through an external rotary device. The stratified sampling tube includes a probe (1) and a negative pressure tube (2). The negative pressure tube (2) is installed inside the probe (1) and can be connected to an external negative pressure pump. A filter screen (11) is embedded on the side wall of the negative pressure tube (2). A sampling mechanism is provided between the filter screen (11) and the probe (1). The sampling mechanism uses the negative pressure in the negative pressure tube (2) to take samples and automatically closes the feed hole (16) when the negative pressure of the filter screen (11) changes due to grain blockage.

2. The layered sampling probe for a grain vertical storage warehouse according to claim 1, characterized in that, A ring-shaped sampling chamber is formed between the filter screen (11) embedded in the negative pressure tube (2) and the inner wall of the probe (1). When negative pressure is generated in the sampling chamber, the sampling mechanism opens and sampling is realized. When the negative pressure in the sampling chamber changes due to grain blockage of the filter screen (11), the sampling mechanism closes.

3. The layered sampling probe for a grain vertical storage warehouse according to claim 2, characterized in that, The sampling mechanism is a duckbill valve (12) fixedly installed on the side wall of the probe (1). The conduction direction of the duckbill valve (12) is such that grain is allowed to flow into the sampling chamber from the outside of the probe (1).

4. The layered sampling probe for a grain vertical storage warehouse according to claim 2, characterized in that, The sampling mechanism is an elastic one-way valve installed on the side wall of the probe (1). The conduction direction of the elastic one-way valve is such that grain is allowed to flow into the sampling chamber from the outside of the probe (1).

5. A layered sampling probe for a grain vertical storage warehouse according to claim 2, characterized in that, The sampling mechanism includes a sliding ring (17), a negative pressure transmission mechanism, a three-way valve, a pressure sensor (27), and three connecting pipes (25). The sliding ring (17) is slidably sleeved on the outer wall of the probe (1) and can block the feed hole (16). The top of the sliding ring (17) is connected to the negative pressure transmission mechanism. The common end of the three-way valve is connected to the negative pressure transmission mechanism through a connecting pipe (25), and the two reversing ends of the three-way valve are connected to the negative pressure tube (2) and the outside of the sampling chamber through the connecting pipes (25), respectively.

6. A layered sampling probe for a grain vertical storage warehouse according to claim 1, characterized in that, The sampling mechanism includes a sampling tube (29), a transmission device, and a negative pressure transmission mechanism. The sampling tube (29) is a telescopic tube, and a sampling port is opened on the side wall of the sampling end of the sampling tube (29). The transmission device is connected to the sliding section of the sampling tube (29) and the negative pressure transmission mechanism. The transmission device transmits the power output end of the negative pressure transmission mechanism to the sliding section of the sampling tube (29). The fixed end of the sampling tube (29) is connected to the negative pressure transmission mechanism, and a sampling chamber is formed between the sampling tube (29) and the two layers of filter screens (11) in the negative pressure transmission mechanism.

7. A layered sampling probe for a grain vertical storage warehouse according to claim 6, characterized in that, The transmission device includes a gear (30) and an arc-shaped sealing plate (28); the outer wall of the sliding section of the sampling tube (29) is a toothed surface, the arc-shaped sealing plate (28) is fixedly connected to the power output end of the negative pressure transmission mechanism, and the outer wall of the arc-shaped sealing plate (28) is also a toothed surface; the gear (30) meshes with the toothed surface of the arc-shaped sealing plate (28) and the toothed surface of the sampling tube (29) at the same time.

8. A layered sampling probe for a grain vertical storage warehouse according to claim 1, characterized in that, The sampling mechanism includes a second sampling tube (34), a filter cylinder (35), a transmission rod (31), a second baffle (32), a fourth spring, a slider (38), and a negative pressure transmission mechanism; the feed hole (16) of the second sampling tube (34) is hinged with an opening and closing plate (33), and the second sampling tube (34) is connected to the power output end of the negative pressure transmission mechanism through the transmission rod (31); the filter cylinder (35) is embedded in the fixed section of the second sampling tube (34); A through groove (39) is vertically opened on the side wall of the probe (1). The slider (38) is slidably set on the outer side wall of the probe (1). The baffle (32) is slidably set on the inner side wall of the probe (1). The side wall of the slider (38) passes through the through groove (39) and is connected to the baffle (32). The top of the baffle (32) is fixedly connected to the spring (4), and the top of the spring (4) is fixedly connected to the inner side wall of the probe (1).

9. A layered sampling probe for a grain vertical storage warehouse according to any one of claims 5-8, characterized in that, The negative pressure transmission mechanism includes a drive tube (21), a spring (37) and a piston (23); the drive tube (21) is fixedly installed inside the probe (1), one end of the spring (37) is fixedly connected to the inner end of the drive tube (21), and the other end of the spring (37) is fixedly connected to the piston (23). The piston (23) is sealed and slidably installed inside the drive tube (21).

10. A rotary drilling device for a grain vertical warehouse, characterized in that, The device includes a main body, on which a rotary drilling mechanism is provided. The power output end of the rotary drilling mechanism is provided with a rotatable hollow connector (40). The discharge end of the connector (40) can be threadedly connected to the probe (1) in claim 1. When connected, it automatically connects to the negative pressure pipe (2) in claim 1. The top of the connector (40) is rotatably provided with a negative pressure connecting pipe (6), which can be connected to an external negative pressure pump. The rotary drilling mechanism can drive the connector (40) to drive the layered sampling probe rod to rotate and cut into the grain pile.

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