Sample sampling device for flaxseed oil detection

Abstract

The utility model relates to the technical field of flaxseed oil detection, in particular to a sample sampling device for flaxseed oil detection, which comprises a sampler, a driving mechanism and a sampling reagent tube, the sampler comprises an isolation cylinder and a plurality of sampling tubes, the upper end of the isolation cylinder is provided with a fixing frame and a sampling port, and the sampling port is arranged on the isolation cylinder. A plurality of first liquid inlets are axially formed in the isolation cylinder, the plurality of sampling pipes are arranged in the isolation cylinder in an array manner in the axial direction of the isolation cylinder, and the outer walls of the sampling pipes are in sliding contact with the inner wall of the isolation cylinder; the sampling tubes are provided with second liquid inlets at the same height relative to the first liquid inlets, the driving mechanism is rotatably connected with the isolation cylinder, the sampling tubes can be in transmission connection with the driving mechanism, and the sampling reagent tubes can extend into the sampling tubes. According to the sampling device, one sampler can accurately sample oil at different positions in the oil drum, the operation process is simplified, and the liquid sampling efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of flaxseed oil detection technology, and in particular to a sample collection device for flaxseed oil detection. Background Technology

[0002] Flaxseed oil is a widely available plant-based oil extracted from the seeds of flax. Its main functions include altering the characteristics of fatty acids, exhibiting anti-inflammatory activity, lowering blood lipids and blood pressure, and inhibiting the development and metastasis of cancer, thus playing a role in disease prevention and treatment. The main components of flaxseed oil are unsaturated fatty acids—x-linolenic acid and linoleic acid. It is characterized by its high stability and ease of storage, thanks to the presence of linolenic acid, a natural antioxidant.

[0003] However, during long-term storage, flaxseed oil may gradually deteriorate due to chemical reactions such as oxidation and degradation. Simultaneously, factors such as temperature, light, and gravity can cause oil stratification or localized concentration differences, affecting its uniformity and quality stability. Therefore, to accurately monitor changes in the physicochemical properties of the oil, it is necessary to sample stratified flaxseed oil from different locations at different storage periods (e.g., 1 month, 3 months, 6 months, 1 year) and conduct independent testing to assess key indicators such as oxidation level, acid value, and peroxide value. Currently, sampling of bottled flaxseed oil mainly relies on manual pouring or extraction using traditional samplers. However, these methods have significant drawbacks. The pouring method can only obtain oil from the surface of the container or a fixed depth, failing to accurately collect samples from different layers. Furthermore, the pouring process disrupts the natural stratification of the oil, resulting in test results that do not accurately reflect the quality differences between the layers. While traditional sampler methods allow for targeted sampling, they can only obtain oil samples from a single location each time. If multiple depths need to be measured, the sampler must be repeatedly removed and inserted, which is cumbersome and inefficient. Furthermore, the repeated insertion and removal of the sampler disturbs the oil, causing different layers to mix, leading to sample contamination and affecting the accuracy of the test data. Utility Model Content

[0004] Therefore, it is necessary to address the problems in existing technologies where, when testing oil at multiple depths in bottled oil, the sampler must be repeatedly removed and inserted, which is cumbersome and inefficient. Furthermore, the repeated insertion and removal of the sampler disturbs the oil, causing mixing of different oil layers, leading to sample contamination and affecting the accuracy of the test data. It is necessary to provide a sample sampling device for flaxseed oil testing that can solve the above-mentioned problems in existing technologies.

[0005] A sample collection device for flaxseed oil testing includes a sampler, a driving mechanism, and sampling reagent tubes. The sampler includes an isolation cylinder and several sampling tubes. The upper end of the isolation cylinder is provided with a fixing frame and a sampling port. Several first liquid inlets are axially arranged on the isolation cylinder. Several sampling tubes are arranged in an array along the axial direction of the isolation cylinder inside the isolation cylinder, and the outer wall of the sampling tube is slidably in contact with the inner wall of the isolation cylinder. Several sampling tubes are respectively provided with second liquid inlets at the same height relative to several first liquid inlets. The driving mechanism is rotatably connected to the isolation cylinder. Several sampling tubes can be driven to the driving mechanism respectively. The driving mechanism is used to drive any one of the sampling tubes to rotate relative to the isolation cylinder so that the first liquid inlets and the second liquid inlets are connected. The sampling reagent tube can extend into the sampling tube.

[0006] Preferably, the outer peripheral surface of the sampling tube is provided with a raised guide rail along the radial direction, and the inner wall surface of the isolation cylinder is provided with a matching guide groove, and the guide rail and the guide groove are slidably connected.

[0007] Preferably, the driving mechanism includes a telescopic driving rod consisting of several telescopic shafts nested sequentially along the axial direction of the isolation cylinder, a driving gear disposed on the uppermost telescopic shaft, and a driving rack disposed on the inner wall of the sampling tube; wherein the driving gear and the driving rack mesh in the same height plane, and the axial extension and retraction of the telescopic driving rod adjusts the engagement of the driving gear with the driving rack at different height positions, so as to drive the sampling tube at the corresponding position individually.

[0008] Preferably, the drive rack is an arc-shaped rack, the curvature of which matches the circumference of the sampling tube; the two ends of the drive rack are provided with limit baffles to limit the meshing stroke of the drive gear.

[0009] Preferably, the bottom of the isolation cylinder is provided with a positioning hole, the sampling port is provided with a limiting plate, the limiting plate is provided with a limiting hole, and the center of the positioning hole and the limiting hole are located on the same center line. The bottom of the telescopic drive rod is rotatably disposed in the positioning hole, and its upper part passes through the limiting hole.

[0010] Preferably, each of the second liquid inlet holes is provided with a drainage pipe, and the length of the drainage pipes is arranged in a gradient increasing direction from the top to the bottom of the isolation cylinder.

[0011] Preferably, several fixing frames are arranged in a circumferential array to position the sampling port of the isolation cylinder on the upper surface of the oil. The fixing frames are made of plastic sheet.

[0012] The technical solution adopted in this application can achieve the following beneficial effects:

[0013] This application discloses a flaxseed oil sampling device for testing. The device employs a double-layer structure design, with the sampling tubes rotatable relative to the isolation cylinder. Each sampling tube corresponds to a specific position within the oil drum. A drive mechanism can individually control the rotation of any sampling tube, connecting its second inlet to the first inlet of the isolation cylinder, achieving precise sampling. During sampling, the device remains immersed in the oil, eliminating the need for repeated removal. By switching sampling tubes at different positions using the drive mechanism, multi-point sampling can be completed. The fixed isolation cylinder prevents disturbance between oil layers, effectively preventing oil mixing at different locations and ensuring the purity of each oil layer. Therefore, this sampling device enables precise sampling of oil from different locations within the oil drum using a single sampler, eliminating the need for frequent sampler removal and insertion, simplifying the operation process and improving sampling efficiency. By keeping the device constantly immersed in the oil, mixing of oils from different layers is effectively avoided, ensuring that the extracted oil comes from a pure sample at the same location within the container. This guarantees the purity of the sample, improves the accuracy of sampling, and thus ensures the accuracy of the test results. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the sample collection device for flaxseed oil detection disclosed in the embodiments of this application;

[0015] Figure 2 This is an axial cross-sectional view of the flaxseed oil testing sample collection device disclosed in the embodiments of this application;

[0016] Figure 3 The sample collection device for flaxseed oil detection disclosed in the embodiments of this application Figure 2 A magnified view of a section at point A in the middle;

[0017] Figure 4 The sample collection device for flaxseed oil detection disclosed in the embodiments of this application Figure 2 A magnified view of a section at point B in the middle;

[0018] Figure 5 This is a schematic diagram of the non-working state of the flaxseed oil testing sample collection device disclosed in the embodiments of this application;

[0019] Figure 6 This is a schematic diagram of the working state of the flaxseed oil testing sample collection device disclosed in the embodiments of this application;

[0020] Figure 7 This is a schematic diagram of the drive rack arrangement disclosed in an embodiment of this application;

[0021] The components include: sampler 100, isolation cylinder 110, fixing frame 111, sampling port 112, first liquid inlet 113, guide groove 114, positioning hole 115, limiting plate 116, sampling tube 120, second liquid inlet 121, guide rail 122, drainage tube 123, drive mechanism 200, telescopic drive rod 210, drive gear 220, drive rack 230, limiting baffle 231, sampling reagent tube 300, oil drum 400, and drum lid 410. Detailed Implementation

[0022] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0023] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please refer to Figures 1 to 7This application discloses a sample collection device for flaxseed oil testing (hereinafter referred to as the sampling device), including a sampler 100, a driving mechanism 200, and a sampling reagent tube 300. The sampler 100 includes an isolation cylinder 110 and a plurality of sampling tubes 120. The upper end of the isolation cylinder 110 is provided with a fixing frame 111 and a sampling port 112. The isolation cylinder 110 is axially provided with a plurality of first liquid inlets 113. The plurality of sampling tubes 120 are arranged in an array along the axial direction of the isolation cylinder 110 inside the isolation cylinder 110, and the outer wall of the sampling tube 120 is flush with the outer wall of the flaxseed oil sampler 100. The inner wall of the isolation cylinder 110 is slidably in contact with the first liquid inlet 113. Several sampling tubes 120 are respectively provided with second liquid inlets 121 at the same height relative to the first liquid inlet 113. The driving mechanism 200 is rotatably connected to the isolation cylinder 110. Several sampling tubes 120 can be drivenly connected to the driving mechanism 200. The driving mechanism 200 is used to drive any one of the sampling tubes 120 to rotate relative to the isolation cylinder 110 so that the first liquid inlet 113 and the second liquid inlet 121 are connected. The sampling reagent tube 300 can extend into the sampling tube 120.

[0026] Specifically, the mounting bracket 111 is mainly used to fix the sampler 100 to the mouth of the oil drum 400, so that the sampling port 112 is always kept on the upper surface of the oil. It can also stably place the entire sampling device inside the oil drum 400 until the entire testing process is completed. When the sampling device is placed inside the oil drum, in order to prevent the sampler 100 from floating during sampling, the mounting bracket 111 is held down by hand to make the mounting bracket fit tightly against the mouth of the drum, so that the sampler 100 is always submerged in the oil. The sampler 100 is designed with a double-layer structure. The isolation cylinder 110 serves as the outer layer that directly contacts the oil, while the sampling tube 120 is located inside the isolation cylinder 110 and connected to it via a sliding contact. This sliding contact allows the isolation cylinder 110 and the sampling tube 120 to slide radially relative to each other. During the radial rotation of the sampling tube 120 relative to the isolation cylinder 110, the inlet channel is sealed (the first inlet 113 and the second inlet 121 are misaligned due to the outer wall of the sampling tube 120). When the first inlet 113 and the second inlet 121 are misaligned, the outer wall of the first inlet 113 can block the first inlet 113. Since the outer wall of the sampling tube 120 is in contact with the inner wall of the isolation cylinder 110, the oil will not flow into the sampling device through the space between the outer wall of the sampling tube 120 and the inner wall of the isolation cylinder 110, thus ensuring the sealing when not sampling and the connection of the inlet channel (the first inlet 113 and the second inlet 121 are connected).

[0027] When a sampling tube 120 rotates, the second inlet 121 on that sampling tube 120 connects with the first inlet 113 to form an inlet channel, thereby enabling precise sampling of the oil at that location. When the device is not in use, the first inlet 113 is blocked by the outer wall of the corresponding sampling tube 120, making the first inlet 113 and the second inlet 121 disconnected, thus sealing the inlet channel and preventing oil from entering the isolation cylinder 110. In addition, each sampling tube 120 is provided with a second liquid inlet 121. The second liquid inlet 121 is provided at the same height as the first liquid inlet 113 of the sampling tube 120. The height of the first liquid inlet 113 and the second liquid inlet 121 are at the same horizontal plane. The second liquid inlet 121 is provided at the same height as the first liquid inlet 113 of the sampling tube 120. In simple terms, the second liquid inlet 121 is provided on any sampling tube 120 corresponding to the first liquid inlet 113, and the second liquid inlet 121 is at the same height as the corresponding first liquid inlet 113. In this way, when a sampling tube 120 is rotated, the second liquid inlet 121 on the sampling tube 120 can be connected to the first liquid inlet 113 (the first liquid inlet 113 corresponding to the sampling tube 120). To meet the sampling requirements of oil at different locations inside the oil drum, multiple sampling tubes 120 are set up, each corresponding to a specific location inside the oil drum (each specific location is provided with a first liquid inlet 113).

[0028] The drive mechanism 200 serves as the core power source for the sampling process, driving only one sampling tube 120 at a specific location each time (this can be done manually by the sampling personnel). Furthermore, when the second inlet 121 is not connected to the first inlet 113, the relative offset angle between the second inlet 121 and the first inlet 113 is defined as the initial position. During sampling, a sampling tube 120 is rotated counterclockwise by a set angle (e.g., 30°, 60°, this application does not limit this). At this time, the second inlet 121 will connect with the first inlet 113 at the same height, forming an inlet channel. After sampling, the sampling tube 120 is rotated clockwise back to the initial position, and the outer wall of the sampling tube 120 will completely block the first inlet 113 at the same height, preventing oil from entering the isolation cylinder 110.

[0029] When using the above sampling device, open the oil drum 400 and unscrew the drum cap 410 to expose the drum opening. Install the sampling device, holding the fixing frame 111, and vertically insert the isolation cylinder 110 into the oil drum 400 along the drum opening until the cylinder body of the isolation cylinder 110 is completely immersed in the oil drum, and place the sampling port 112 of the isolation cylinder 110 2-3 cm above the surface of the oil. Then, adjust the fixing frame 111 to fit tightly against the drum opening to ensure the stability of the isolation cylinder 110 in the oil. Determine the target sampling location (such as the upper, middle, or lower layer of oil) according to the testing requirements. Insert the sampling reagent tube 300 into the isolation cylinder 110 and place the sampling reagent tube 300 at the second inlet 121 of the sampling tube 120 (the sampling tube 120 corresponding to the target sampling location). Then, rotate the drive mechanism 200 counterclockwise to rotate the sampling tube 120. After rotating to the set angle, the second inlet 121 on the sampling tube 120 is completely aligned with the corresponding first inlet 113 on the isolation cylinder 110. The oil flows into the sampling reagent tube 300 under the influence of gravity and pressure difference. Keep the inlet channel open and continue sampling for the set time (e.g., 5-10 seconds) to ensure consistent sampling volume. After sampling, rotate the drive mechanism 200 clockwise until the second inlet 121 and the first inlet 113 are completely misaligned (misalignment angle ≥ 20°), so that the outer wall of the sampling tube 120 completely seals the first inlet 113. Finally, remove the sampling reagent tube 300 from the sampling port 112 to complete a single sampling. Repeat the above steps to sample oil from other locations (e.g., upper, middle, and lower layers) to ensure sample representativeness. After all sampling is completed, tighten the lid 410 to restore the oil drum 400 to a sealed state. The lid 410 can be opened for sampling during the next sampling, thus enabling stratified sampling of different locations of the drummed flaxseed oil at different storage periods.

[0030] This device can be placed inside the oil drum 400 for an extended period without repeated disassembly and reassembly. For the next sampling, simply open the drum lid 410 and repeat the operation steps, significantly improving the efficiency of continuous sampling. It should be noted that in this application, when adjusting the alignment of the drive mechanism 200 with the sampling tube 120, and the alignment of the sampling reagent tube 300 with the second liquid inlet 121, this can be observed through the sampling port 112 above. Alternatively, the sampler 100 disclosed in this application (such as the isolation cylinder 110 and sampling tube 120) can be made into a transparent device; for example, the isolation cylinder 110 and sampling tube 120 can both be made of acrylic material.

[0031] Using the flaxseed oil testing sample collection device in this embodiment has at least the following beneficial effects: The sampling device adopts a double-layer structure design, with the sampling tube 120 rotatable relative to the isolation cylinder 110. Each sampling tube 120 corresponds to a specific position within the oil drum 400. The drive mechanism 200 can individually control the rotation of any sampling tube 120, connecting its second inlet 121 with the first inlet 113 of the isolation cylinder 110, thus achieving precise positioning and sampling. During sampling, the device remains immersed in the oil, eliminating the need for repeated removal. By switching the sampling tubes 120 at different positions using the drive mechanism 200, multi-point sampling can be completed. The fixed isolation cylinder 110 avoids disturbance between oil layers, preventing disruption of the natural stratification of the oil and effectively preventing oil mixing at different locations, ensuring the purity of each oil layer. Therefore, this sampling device enables a single sampler 100 to accurately sample oil from different locations within the oil drum 400. It eliminates the need for frequent removal and insertion of the sampler, simplifying the operation and improving sampling efficiency. By keeping the device constantly immersed in the oil, mixing of oil from different locations is effectively prevented, ensuring that the extracted oil comes from a pure sample at the same location within the drum. This guarantees sample purity and thus ensures the accuracy of the test results, improving sampling precision.

[0032] In one embodiment, to ensure that the sampling tube 120 maintains a stable movement trajectory inside the isolation cylinder 110, a raised guide rail 122 is provided radially on the outer peripheral surface of the sampling tube 120, and a matching guide groove 114 is provided on the inner wall surface of the isolation cylinder 110, wherein the guide rail 122 and the guide groove 114 are slidably connected.

[0033] Specifically, by providing multiple guide grooves 114 on the inner wall of the isolation cylinder 110, and slidingly connecting the guide rail 122 and the guide grooves 114, an axial array arrangement of multiple sampling tubes 120 can be achieved within a limited space. This restricts the movement of the sampling tubes 120 within a preset track, enabling each sampling tube 120 to correspond to sampling points at different depths within the oil drum. It also effectively prevents the sampling tubes 120 from axially shifting or radially moving during the process, ensuring the reliability of the sampling process.

[0034] In one embodiment, the drive mechanism 200 includes a telescopic drive rod 210 consisting of several telescopic shafts nested sequentially along the axial direction of the isolation cylinder, a drive gear 220 disposed on the uppermost telescopic shaft, and a drive rack 230 disposed on the inner wall of the sampling tube; wherein the drive gear 220 and the drive rack 230 mesh in the same height plane, and the axial extension and retraction of the telescopic drive rod 210 adjusts the engagement of the drive gear 220 with the drive rack 230 at different height positions, so as to drive the sampling tube 120 at the corresponding position individually.

[0035] Specifically, by extending the telescopic shaft in stages, the drive gear 220 meshes with the drive rack 230 at the target height position. Rotating the telescopic drive rod 210 drives the sampling tube 120 at the corresponding position to rotate. The meshing of the drive gear 220 and the drive rack 230 is a gear meshing, ensuring the stability and accuracy of the transmission. For example, please refer to... Figure 2 To sample the upper layer of oil, first, the telescopic drive rod 210 is stretched, causing each telescopic shaft to extend section by section, increasing the height of the telescopic drive rod 210. This causes the drive rod 210 to drive the drive gear 220 upwards until the drive gear 220 is at the same plane height and meshes with the drive rack 230 inside the upper sampling tube 120. At this point, rotating the telescopic drive rod 210 causes the upper sampling tube 120 to rotate radially on the inner wall of the isolation cylinder 110, thereby sampling the upper layer of oil. To sample oil at different heights, the telescopic drive rod 210 is stretched or contracted, causing the drive gear 220 to be at the same plane and meshing with the drive rack 230 inside the sampling tube 120 at different heights, thus sampling the oil at those heights. The above steps are repeated to complete oil sampling at different heights.

[0036] Furthermore, to fix the height of the telescopic drive rod 210 after it is extended or retracted, and to prevent axial displacement of the telescopic drive rod 210 during operation, the telescopic drive rod 210 can be a nested sleeve-type telescopic rod (such as the multi-layer nested telescopic rod used in telescopic antennas in the prior art). The length of the telescopic drive rod 210 is increased by pulling it out section by section. After the telescopic drive rod 210 is extended or retracted, the friction between adjacent telescopic shafts locks them together, preventing axial displacement of the telescopic drive rod 210 during operation and ensuring stable meshing between the drive gear 220 and the drive rack 230.

[0037] When the sampling device is not in operation, the telescopic drive rod 210 is retracted to its shortest distance and locked by friction, allowing the entire structure to be compactly stored inside the oil drum opening for easy storage. When the sampling device is in operation, according to sampling requirements, the telescopic shafts of the telescopic drive rod 210 are extended in stages until the drive gear 220 is on the same plane and meshes with the drive rack 230 on the inner wall of the sampling tube at the target height. At this point, the height of the telescopic drive rod 210 is fixed by friction locking between adjacent telescopic shafts. Then, by manually or with external power, the telescopic drive rod 210 is rotated, and the drive gear 220 drives the meshing drive rack 230, thereby driving the sampling tube 120 at the corresponding height to rotate, achieving directional sampling of oil at that location. Since the drive gear 220 only meshes with the drive rack 230 at a single height, only one sampling tube 120 at a target position is driven at a time, avoiding multi-stage linkage and ensuring sampling accuracy.

[0038] In one embodiment, the drive rack 230 is an arc-shaped rack whose curvature matches the circumference of the sampling tube 120; the two ends of the drive rack 230 are provided with limit baffles 231 to limit the meshing stroke of the drive gear 220 and prevent it from disengaging from the meshing area.

[0039] Specifically, the drive rack 230 is designed in an arc shape to fit against the cylindrical inner wall of the sampling tube 120, ensuring that the meshing surfaces of the drive gear 220 and the drive rack 230 always maintain optimal contact, reducing vibration or slippage during transmission, and improving the smoothness and accuracy of transmission. Limiting baffles 231 at both ends of the drive rack 230 form physical barriers. When the drive gear 220 rotates to the end of the rack, the limiting baffles 231 prevent the gear from moving further, avoiding accidental disengagement of the gear from the meshing area, which could lead to transmission failure or mechanism jamming. The spacing of the limiting baffles 231 determines the maximum rotatable range of the drive gear 220, thereby indirectly controlling the rotation angle of the sampling tube 120 (such as 30°, 60°, etc.), ensuring that the second liquid inlet 121 and the first liquid inlet 113 are connected or staggered only within the set angle range, achieving accurate sampling. For example, when rotating counterclockwise until it can no longer be rotated (the drive gear 220 abuts against the limiting baffles 231), the second liquid inlet 121 and the first liquid inlet 113 are aligned and connected. When rotating clockwise until it can no longer be rotated (the drive gear 220 abuts against the limiting baffles 231), the second liquid inlet 121 and the first liquid inlet 113 are in a non-connected state. In this way, the operator only needs to determine the relative position of the second liquid inlet 121 and the first liquid inlet 113 when it can no longer be rotated, avoiding the inconvenience caused by the operator having to measure the rotation angle.

[0040] When using this device, manually rotate the telescopic drive rod 210 counterclockwise to drive the drive gear 220 to move along the arc-shaped rack. When the drive gear 220 rotates to the front end of the drive rack 230, the limiting baffle 231 will prevent the gear from moving further. At this time, the second liquid inlet 121 is axially aligned with the first liquid inlet 113, and the internal channel of the sampling tube 120 is fully open. After sampling is completed, when the telescopic drive rod 210 rotates clockwise to the end of the drive rack 230, the limiting baffle 231 will prevent the gear from moving further. At this time, the outer wall of the sampling tube 120 will completely cover the first liquid inlet 113, and the misalignment angle between the second liquid inlet 121 and the first liquid inlet 113 will be ≥20°, achieving physical sealing.

[0041] In one embodiment, to ensure the axial stability and coaxiality of the telescopic drive rod during extension, retraction and rotation, a positioning hole 115 is provided at the bottom of the isolation cylinder 110, and a limiting plate 116 is provided at the sampling port 112. A limiting hole is provided on the limiting plate 116, and the center of the positioning hole 115 and the limiting hole are located on the same center line. The bottom of the telescopic drive rod 210 is rotatably disposed in the positioning hole 115, and its upper part passes through the limiting hole.

[0042] Specifically, the positioning hole 115 is a stepped hole, smaller at the top and larger at the bottom, located at the bottom of the isolation cylinder 110. On one hand, it restricts the bottom end of the telescopic drive rod 210 in the vertical direction, preventing the telescopic drive rod 210 from being pulled out of the isolation cylinder 110 when stretched; on the other hand, it allows the rod to rotate around the center of the positioning hole 115 while limiting radial offset, ensuring the vertical alignment of the telescopic drive rod 210. A limiting hole is located on the limiting plate 116 at the sampling port 112, coaxial with the positioning hole 115. The top end of the telescopic drive rod 210 passes through the limiting hole, forming a "double-support point" structure, preventing the telescopic drive rod 210 from swaying or tilting during extension, retraction, or rotation, thus improving stability. The centers of the positioning hole 115 and the limiting hole are located on the same center line. The dual positioning of the positioning hole 115 and the limiting hole ensures the axial stability and coaxiality of the telescopic drive rod 210 during extension, retraction, and rotation, ensuring that the telescopic drive rod 210 always moves in the vertical direction. This avoids problems such as poor meshing or jamming between the drive gear 220 and the drive rack 230 due to misalignment. The limiting hole on the limiting plate 116 not only provides axial support but also limits the maximum extension height of the telescopic drive rod 210, preventing excessive lifting that could cause the drive gear 220 to disengage.

[0043] In one embodiment, in order to allow the liquid to flow more smoothly into the sampling reagent tube 300, a plurality of second liquid inlets 121 are provided with drainage tubes 123, and the lengths of the plurality of drainage tubes 123 are arranged in a gradient increasing direction from the top to the bottom of the isolation cylinder 110.

[0044] Specifically, the drainage tube 123 allows the oil to flow smoothly into the sampling reagent tube 300 without flowing onto the inner wall of the sampling tube 120 through the second inlet 121. Along the top to bottom of the isolation cylinder 110, the length of the drainage tube 123 increases in a stepped manner (shorter at the top and longer at the bottom), allowing operators to quickly identify the drainage tube 123 at the target height without needing to observe it from multiple angles through the sampling port 112, thus shortening the docking time between the sampling reagent tube 300 and the drainage tube 123. Furthermore, the gradient length arrangement ensures that the sampling reagent tube 300 is not obstructed when inserted into the sampler 100.

[0045] In one embodiment, several fixing frames 111 are arranged in a circumferential array to position the sampling port 112 of the isolation cylinder 110 on the upper surface of the oil. The fixing frames 111 are made of plastic sheet.

[0046] Specifically, the fixing bracket 111 is mainly used to more stably fix the isolation cylinder 110 inside the oil drum 400, so that the sampling port 112 of the isolation cylinder 110 is always located on the upper surface of the oil. The fixing bracket 111 is made of a plastic sheet, which allows the peripheral contour of the fixing bracket 111 to form a complementary structure with the inner surface of the oil drum lid. When the drum lid 410 is tightened, the plastic sheet is compressed and produces an elastic deformation of 0.1-0.3mm, which ensures that the sealing pressure is evenly distributed and avoids sealing failure caused by rigid contact.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A sample collection device for detecting flaxseed oil, characterized in that, The device includes a sampler, a driving mechanism, and sampling reagent tubes. The sampler includes an isolation cylinder and several sampling tubes. The upper end of the isolation cylinder is provided with a fixing frame and a sampling port. The isolation cylinder has several first liquid inlets axially arranged. Several sampling tubes are arranged in an array along the axial direction of the isolation cylinder inside the isolation cylinder, and the outer wall of the sampling tube is slidably in contact with the inner wall of the isolation cylinder. Several sampling tubes are respectively provided with second liquid inlets at the same height relative to several first liquid inlets. The driving mechanism is rotatably connected to the isolation cylinder. Several sampling tubes can be driven to the driving mechanism respectively. The driving mechanism is used to drive any one of the sampling tubes to rotate relative to the isolation cylinder so that the first liquid inlets and the second liquid inlets are connected. The sampling reagent tube can extend into the sampling tube.

2. The sample collection device for flaxseed oil detection according to claim 1, characterized in that, The outer circumferential surface of the sampling tube is provided with a raised guide rail along the radial direction, and the inner wall surface of the isolation cylinder is provided with a matching guide groove. The guide rail and the guide groove are slidably connected.

3. The sample collection device for flaxseed oil detection according to claim 1, characterized in that, The driving mechanism includes a telescopic driving rod consisting of several telescopic shafts nested sequentially along the axial direction of the isolation cylinder, a driving gear disposed on the uppermost telescopic shaft, and a driving rack disposed on the inner wall of the sampling tube; wherein, the driving gear and the driving rack mesh in the same height plane, and the axial extension and retraction of the telescopic driving rod adjusts the engagement of the driving gear with the driving rack at different height positions, so as to drive the sampling tube at the corresponding position individually.

4. The sample collection device for flaxseed oil detection according to claim 3, characterized in that, The drive rack is an arc-shaped rack, the curvature of which matches the circumference of the sampling tube; the two ends of the drive rack are provided with limit baffles to limit the meshing stroke of the drive gear.

5. The sample collection device for flaxseed oil detection according to claim 4, characterized in that, The bottom of the isolation cylinder is provided with a positioning hole, and a limiting plate is provided at the sampling port. A limiting hole is provided on the limiting plate, and the center of the positioning hole and the limiting hole are located on the same center line. The bottom of the telescopic drive rod is rotatably disposed in the positioning hole, and its upper part passes through the limiting hole.

6. The sample collection device for flaxseed oil detection according to claim 1, characterized in that, Each of the second liquid inlets is provided with a drainage pipe, and the length of the drainage pipes is arranged in a gradient increasing direction from the top to the bottom of the isolation cylinder.

7. The sample collection device for flaxseed oil detection according to claim 1, characterized in that, The fixing frame is arranged in a circumferential array of several units to position the sampling port of the isolation cylinder on the upper surface of the oil. The fixing frame is made of a thin plastic sheet.

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