Sampling device for food safety inspection and detection

Abstract

The invention provides a sampling device for food safety inspection and detection, and belongs to the technical field of food detection.The sampling device comprises a supporting cylinder, sliding grooves are formed in the two sides of the supporting cylinder in the length direction; the two ends of the moving unit extend out of the two sliding grooves respectively and are in sliding fit with the two sliding grooves; the annular moving limiting assembly is arranged on the outer side of the supporting cylinder in a sleeving mode and moves in the length direction of the supporting cylinder; the second-stage telescopic assembly is erected at the top of the supporting cylinder and comprises two-stage telescopic ends, and the first-stage telescopic end of the second-stage telescopic assembly is connected with the moving unit and drives the moving unit to slide in the supporting cylinder; the elastic sampling unit is fixedly erected below the moving unit, and the end part of the elastic sampling unit is a multi-cavity piston; when the second-stage telescopic end of the second-stage telescopic assembly extends, the multi-cavity piston of the elastic sampling unit is pushed to extend out of one cavity. The device can rapidly collect multi-depth samples in a short time, effectively improves the randomness of the samples, and improves the collection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of food detection, and particularly relates to a sampling device for food safety inspection and testing. Background Art

[0002] Food safety inspection is of profound significance for maintaining public health, ensuring social stability and promoting the healthy development of the food industry. It is not only a strict defense line that can effectively identify and eliminate foods containing potential risks such as pesticide residues, heavy metals, and harmful microorganisms, thereby ensuring that consumers are protected from foodborne diseases and safeguarding the lives and physical health of the people.

[0003] Diverse samples can effectively improve the accuracy of analysis, reduce false conclusions caused by sample deviation or singularity, and make the data analysis results more robust and reliable. For this reason, food sampling usually requires collecting samples at different positions and depths. Existing multi-depth food sampling devices either set multiple sampling points at the sampling end for synchronous sampling, or adopt a cyclic sampling mode of sampling - sampling and releasing - sampling at different depths and positions multiple times. However, synchronous sampling at multiple sampling points lacks randomness, the sampling positions of the samples are limited, and the ability to sample randomly at multiple points and multiple depths is lacking; while the cyclic sampling mode of sampling - sampling and releasing - sampling cannot collect samples at random positions multiple times in a short time, and the efficiency is low. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a sampling device for food safety inspection and testing, which can quickly collect multi-depth samples in a short time and effectively improve the randomness and collection efficiency of the samples.

[0005] The present invention provides the following technical solutions:

[0006] A sampling device for food safety inspection and testing, comprising:

[0007] A support cylinder, with sliding grooves opened along its length on both sides;

[0008] A moving unit, with both ends respectively extending out of the two sliding grooves and slidingly cooperating with the two sliding grooves;

[0009] An annular moving limiting component, sleeved outside the support cylinder and moving along the length direction of the support cylinder;

[0010] A secondary telescopic component, erected on the top of the support cylinder, including two telescopic ends. Its first-stage telescopic end is connected to the moving unit and drives the moving unit to slide inside the support cylinder. When the moving unit moves, both ends of it abut against the annular moving limiting component; wherein, after the first-stage telescopic end is blocked, the second-stage telescopic end extends and retracts;

[0011] The elastic sampling unit is fixedly installed below the moving unit, and its end is a multi-chamber piston; when the second-stage telescopic end of the second-stage telescopic assembly extends, it pushes the multi-chamber piston of the elastic sampling unit to extend out of one chamber.

[0012] Preferably, the moving unit includes a sampling ring; limiting plates are fixed at both ends of the sampling ring; the limiting plates are slidably arranged in the sliding grooves.

[0013] Preferably, the second-stage telescopic assembly includes:

[0014] A mounting plate, fixedly installed on the top of the support cylinder;

[0015] A threaded column; a groove is formed at the bottom of the sampling ring, and the threaded column is in threaded cooperation with the groove. The bottom of the groove has an annular end face that limits the top of the threaded column;

[0016] A gear assembly, arranged on the mounting plate;

[0017] A first ball screw, one end of which passes through the gear assembly and the mounting plate, is in threaded cooperation with the gear assembly, and is slidably engaged with the mounting plate; one end of the first ball screw is fixedly connected to the top of the threaded column.

[0018] Preferably, the gear assembly includes:

[0019] A driving gear, rotatably arranged on the top of the mounting plate;

[0020] A driven gear, rotatably arranged on the top of the mounting plate and meshed with the driving gear; the first ball screw passes through the driven gear and is in threaded cooperation with the driven gear;

[0021] A first motor, fixedly arranged at the bottom of the mounting plate, and its output shaft is in transmission connection with the driving gear.

[0022] Preferably, the annular moving limiting assembly includes:

[0023] Two linear driving assemblies, respectively arranged on the outside of the support cylinder;

[0024] A limiting ring, connected to the two linear driving assemblies, and is driven synchronously by the two linear driving assemblies to move along the length direction of the support cylinder.

[0025] Preferably, the linear driving assembly includes:

[0026] A guide rail, fixedly arranged on the outside of the support cylinder;

[0027] A moving block, slidably arranged in the guide rail; the two moving blocks of the two linear driving assemblies are respectively fixedly connected to the limiting ring;

[0028] A second ball screw passes through the moving block and is in threaded engagement with the moving block; both ends of the second ball screw are rotatably engaged with both ends of the guide rail.

[0029] A second motor is fixedly arranged at one end of the guide rail, and its output shaft is in transmission connection with the second ball screw.

[0030] Preferably, a limit sensor is arranged at the top of the limit ring; the limit sensor is located directly below the limit plate.

[0031] Preferably, the elastic sampling unit includes:

[0032] A reference plate is slidably arranged in the support cylinder; the top of the reference plate is fixedly connected with the sampling ring through two fixing rods.

[0033] A feed rod passes through the reference plate at one end and is in sliding engagement with the reference plate; a positioning plate is fixedly arranged at one end of the feed rod.

[0034] A return spring is sleeved on the feed rod, and its two ends are respectively connected with the bottom of the positioning plate and the top of the reference plate.

[0035] A support rod has one end fixedly connected with the bottom of the reference plate; the multi-chamber piston includes a sampling cylinder, a piston rod and a plurality of piston plates; the plurality of piston plates are fixedly arranged in an array on the piston rod body, one end of the piston rod is fixedly connected with the other end of the feed rod; the plurality of piston plates are in sliding engagement with the sampling cylinder; the other end of the support rod is fixedly connected with the outer side wall of the sampling cylinder.

[0036] Advantages of the present invention:

[0037] The present invention provides a sampling device for food safety inspection and detection. The device dynamically adjusts the height of the limit ring through the annular moving limit component, supports preset or random height points, realizes multi-depth sampling, and enhances the randomness and representativeness of the samples through random height setting; the device adopts a two-stage telescopic component, specifically a two-stage telescopic structure combining a gear component and a ball screw. The first stage linearly presses down to the limit and then triggers the second stage to rotate and feed. Only a single driving action can complete the sampling at the target depth. Cooperating with the dynamic switching of the multi-chamber piston and repeatedly driving the two-stage telescopic structure to expand and contract can realize multi-depth sampling, reducing the driving control cost; the multi-chamber piston proposed by the device integrates multiple independent chambers, and different chambers are sequentially exposed for sampling through the expansion and contraction of the feed rod, which can capture samples at different depths in layers, reduce repeated sampling actions, and effectively improve the sampling efficiency. The device also realizes the automatic reset of the sampling unit through the cooperation of the return spring and the sliding groove, without manual intervention for recovery, shortening the sampling-discharging cycle, and avoiding sample cross-contamination at the same time. Description of the Drawings

[0038] Figure 1 is the overall assembly structure diagram of the sampling device for food safety inspection and testing in the embodiments of the present invention;

[0039] Figure 2 is the internal structure diagram of the sampling device for food safety inspection and testing in the embodiments of the present invention;

[0040] Figure 3 is the partial structure diagram of the sampling device for food safety inspection and testing in the embodiments of the present invention;

[0041] Figure 4 is the internal structure diagram of the multi-chamber piston of the sampling device for food safety inspection and testing in the embodiments of the present invention.

[0042] Wherein, 1, support cylinder; 2, connecting plate; 3, limiting plate; 4, limit sensor; 5, limiting ring; 6, moving block; 7, sampling cylinder; 8, support rod; 9, feed rod; 10, guide rail; 11, second ball screw; 12, second motor; 13, frame plate; 14, driving gear; 15, driven gear; 16, first ball screw; 17, first motor; 18, sampling ring; 19, threaded column; 20, positioning plate; 21, return spring; 22, reference plate; 23, fixed rod; 24, piston plate; 25, piston rod. Detailed Description of the Invention

[0043] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0046] Embodiment

[0047] Existing multi-depth food sampling devices either set multiple sampling points at the sampling end for synchronous sampling, or adopt a cyclic sampling mode of sampling - sampling and releasing - sampling at multiple different depths and positions. However, synchronous sampling at multiple sampling points lacks randomness, the sampling positions of the samples are restricted, and the ability to sample randomly at multiple points and multiple depths is lacking; while the cyclic sampling mode of sampling - sampling and releasing - sampling cannot collect samples at random positions multiple times in a short period of time, and the efficiency is relatively low. For this reason, this embodiment proposes a sampling device for food safety inspection and testing, and the specific structure is as Figure 1 and Figure 2 shown. Figure 1 is the overall structure diagram. Figure 2It is the internal structure diagram shown after removing half of the structure of the support cylinder 1. Specifically, it includes a support cylinder 1, a moving unit, an annular moving limit component, a secondary telescopic component, and an elastic sampling unit. Sliding grooves are provided on both sides of the support cylinder 1 along the length direction; both ends of the moving unit extend out of the two sliding grooves and are slidably matched with the two sliding grooves; the annular moving limit component is sleeved outside the support cylinder 1 and moves along the length direction of the support cylinder 1; the secondary telescopic component is erected on the top of the support cylinder 1 and includes two levels of telescopic ends. Its first-level telescopic end is connected to the moving unit and drives the moving unit to slide inside the support cylinder 1. When the moving unit moves, its two ends are in contact with the annular moving limit component; among them, after the first-level telescopic end is blocked, the second-level telescopic end expands and contracts; the elastic sampling unit is fixedly erected below the moving unit, and its end is a multi-chamber piston; when the second-level telescopic end of the secondary telescopic component extends, it pushes the multi-chamber piston of the elastic sampling unit to extend out of one chamber. The present invention limits the sampling depth through the annular moving limit component, realizes sampling through the single drive of the secondary telescopic component, and respectively samples multi-depth samples through the independent chambers of the multi-chamber piston, reducing the lofting steps and increasing the sampling efficiency of the samples on the premise of improving the randomness of the samples.

[0048] Further, the present invention gives the following embodiments:

[0049] As Figure 2 and Figure 3 shown, Figure 3 It is a partial internal structure diagram, showing the transmission details. The moving unit includes a sampling ring 18; limit plates 3 are fixed at both ends of the sampling ring 18; the limit plates 3 are slidably arranged in the sliding grooves. The secondary telescopic component includes a mounting plate 13, a threaded column 19, a gear assembly, and a first ball screw 16. The mounting plate 13 is fixedly erected on the top of the support cylinder 1; a groove is provided at the bottom of the sampling ring 18, and the threaded column 19 is in threaded cooperation with the groove, and the bottom of the groove has an annular end face that limits the top of the threaded column 19.

[0050] The gear assembly is arranged on the mounting plate 13. The gear assembly includes a driving gear 14, a driven gear 15, and a first motor 17. The driving gear 14 is rotatably arranged on the top of the mounting plate 13; the driven gear 15 is rotatably arranged on the top of the mounting plate 13 and meshes with the driving gear 14; the first ball screw 16 passes through the driven gear 15 and is in threaded cooperation with the driven gear 15; the first motor 17 is fixedly arranged at the bottom of the mounting plate 13, and its output shaft is in transmission connection with the driving gear 14.

[0051] One end of the first ball screw 16 passes through the gear assembly and the mounting plate 13, and is in threaded cooperation with the gear assembly and slidably matched with the mounting plate 13; one end of the first ball screw 16 is fixedly connected to the top of the threaded column 19.

[0052] The above structure gives the specific implementation details of the two-stage telescoping. The first ball screw 16 is driven to move up and down by the gear assembly. When the movement is restricted by the annular movement limiting assembly (i.e., the randomly set depth), the threaded column 19 is driven to rotate and move downward to achieve two-stage telescoping.

[0053] As Figure 3 shown, the present invention provides a structure of an annular movement limiting assembly driven by two screw sliders. Equivalently, other linear drive structures can be used to drive the limiting ring 5. Specifically, it includes:

[0054] Two linear drive assemblies are respectively arranged on the outer side of the support cylinder 1. The linear drive assembly includes a guide rail 10, a moving block 6, a second ball screw 11 and a second motor 12. The guide rail 10 is fixedly arranged on the outer side of the support cylinder 1; the moving block 6 is slidably arranged in the guide rail 10; the two moving blocks 6 of the two linear drive assemblies are respectively fixedly connected to the limiting ring 5; the second ball screw 11 passes through the moving block 6 and is in threaded cooperation with the moving block 6; both ends of the second ball screw 11 are rotatably cooperated with both ends of the guide rail; the second motor 12 is fixedly arranged at one end of the guide rail 10, and its output shaft is in transmission connection with the second ball screw 11.

[0055] The limiting ring 5 is connected to the two linear drive assemblies. By synchronously driving the moving block 6 by the two linear drive assemblies, the limiting ring 5 is driven to move along the length direction of the support cylinder 1.

[0056] In order to further control the traveling state of the current first ball screw 16, a limiting sensor 4 is arranged at the top of the limiting ring 5. As feedback, the limiting sensor 4 is located directly below the limiting plate 3 and can be a pressure sensor.

[0057] The acquisition end of the present invention is a multi-chamber structure and adopts the method of elastic reset sampling. As Figure 4 shown, Figure 4 is the internal structure diagram shown by removing half of the structure of the sampling cylinder 7. The elastic sampling unit includes a reference plate 22, a feed rod 9, a return spring 21 and a support rod 8. The reference plate 22 is slidably arranged in the support cylinder 1; the top of the reference plate 22 is fixedly connected to the sampling ring 18 through two fixing rods 23; one end of the feed rod 9 passes through the reference plate 22 and is slidably cooperated with the reference plate 22; a positioning plate 20 is fixedly arranged at one end of the feed rod 9; the return spring 21 is sleeved on the feed rod 9, and its two ends are respectively connected to the bottom of the positioning plate 20 and the top of the reference plate 22; one end of the support rod 8 is fixedly connected to the bottom of the reference plate 22; the multi-chamber piston includes a sampling cylinder 7, a piston rod 25 and a plurality of piston plates 24; the plurality of piston plates 24 are fixedly arranged in an array on the rod body of the piston rod 25, and one end of the piston rod 25 is fixedly connected to the other end of the feed rod 9; the plurality of piston plates 24 are slidably cooperated with the sampling cylinder 7; the other end of the support rod 8 is fixedly connected to the outer side wall of the sampling cylinder 7.

[0058] In this embodiment, the sampling method of the sampling device for food safety inspection and testing specifically includes the following steps:

[0059] S1: The support cylinder 1 is driven by a truss manipulator or other movable support to move above the food to be sampled. Among them, the sampling object can be a liquid, a colloidal solid or a granular solid. The piston-type sampling device is not suitable for hard solid sampling.

[0060] S2: Determine the first sampling height. By driving the annular moving limit component to move, the limit ring 5 is driven to move along the length direction of the support cylinder 1 to realize the adjustment and limitation of the sampling height. Among them, the sampling height can be a random point or several preset height points, and the sampling ring 18 is fed and limited by the limit ring 5.

[0061] S3: Drive the first-stage telescopic end of the secondary telescopic component to extend and retract until it is blocked, and then drive the second-stage telescopic end to extend and retract. That is, the first ball screw 16 that is in threaded cooperation with it is driven to move linearly by the gear component, driving the sampling ring 18 and the elastic sampling unit to move downward as a whole until the limit plates 3 at both ends of the sampling ring 18 are blocked by the limit ring 5. Under the continuous downward feeding force and the rotational feeding force provided by the gear component, the threaded column 19 overcomes the friction force, breaks away from the rotational limit, and rotates synchronously with the first ball screw 16 to achieve secondary telescoping.

[0062] S4: The threaded column 19 pushes the feed rod 9 to feed, the return spring 21 is compressed, all the cavities on the piston rod 25 are extended, and the cavity of the first multi-cavity piston close to the feed rod 9 is sampled first.

[0063] S5: Drive the gear component to rotate in the reverse direction, the first ball screw 16 and the threaded column 19 rotate in the reverse direction, the cavity of the piston rod 25 close to the feed rod 9 retracts the sampling cylinder 7, and the other cavities are exposed.

[0064] S6: Drive the truss manipulator to move upward, the elastic sampling unit completely disengages from the sampling object, and the samples in other cavities are freely discharged; at the same time, drive the annular moving limit component to move downward to determine the second height point.

[0065] S7: Then drive the gear component to rotate in the reverse direction again, the first ball screw 16 and the threaded column 19 rotate in the reverse direction, and the piston rod 25 is integrally retracted into the sampling cylinder 7 under the action of the return spring 21, and at the same time the sampling ring 18 is pushed upward. When it is pushed to the top of the sliding groove, under the limit of the top of the sliding groove, the threaded column 19 meshes with the sampling ring 18 again.

[0066] S8: Drive the truss manipulator to move down to the original position, drive the gear assembly, and extend and retract through the secondary telescopic assembly in sequence again. Repeat S3 - S4 to sample through the second cavity close to the feed rod 9, and repeat S5 - S7 to perform sampling of the second cavity.

[0067] S9: Repeat the execution until all cavity samplings are completed, achieving the purpose of quickly sampling multiple depth samples. In addition, during lofting, the cavities can be lofted one by one.

[0068] The sampling method of the sampling device for food safety inspection and detection proposed in this embodiment dynamically adjusts the height of the limit ring 5 through the annular moving limit assembly, supports preset or random height points, realizes multi-depth sampling, and enhances the randomness and representativeness of the samples through random height setting; the device adopts a secondary telescopic assembly, specifically a secondary telescopic structure combining a gear assembly and a ball screw. The first stage linearly presses down to trigger the second stage of rotary feeding after reaching the limit. Only a single driving action can complete the sampling at the target depth. Cooperating with the dynamic switching of the multi-cavity piston, repeatedly driving the secondary telescopic structure to extend and retract can realize multi-depth sampling, reducing the driving control cost; the multi-cavity piston proposed by the device integrates multiple independent cavities, and different cavities are sequentially exposed for sampling through the extension and retraction of the feed rod, which can capture samples at different depths in layers, reduce repeated lofting actions, and effectively improve the sampling efficiency. The device also realizes the automatic reset of the sampling unit through the cooperation of the return spring and the sliding groove, without manual intervention for recovery, shortens the sampling - discharging cycle, and avoids cross-contamination of samples.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sampling device for food safety inspection and testing, characterized in that, Comprising: A support cylinder (1) with sliding grooves opened along its length on both sides; A moving unit, with both ends respectively extending out of the two sliding grooves and slidingly cooperating with the two sliding grooves; An annular moving limiting component, sleeved outside the support cylinder (1) and moving along the length direction of the support cylinder (1); A secondary telescopic component, erected on the top of the support cylinder (1), including two levels of telescopic ends. Its first-level telescopic end is connected to the moving unit and drives the moving unit to slide inside the support cylinder (1). When the moving unit moves, its two ends abut against the annular moving limiting component; wherein, after the first-level telescopic end is blocked, the second-level telescopic end extends and retracts; An elastic sampling unit, fixedly erected below the moving unit, with its end being a multi-chamber piston; when the second-level telescopic end of the secondary telescopic component extends, it pushes the multi-chamber piston of the elastic sampling unit to extend out of one chamber.

2. The sampling device for food safety inspection and testing according to claim 1, characterized in that, The moving unit includes a sampling ring (18); both ends of the sampling ring (18) are fixedly provided with limiting plates (3); the limiting plates (3) are slidably arranged in the sliding grooves.

3. The sampling device for food safety inspection and testing according to claim 2, wherein, The secondary telescopic component includes: A mounting plate (13), fixedly erected on the top of the support cylinder (1); A threaded column (19); a groove is opened at the bottom of the sampling ring (18), and the threaded column (19) is in threaded cooperation with the groove. The bottom of the groove has an annular end face that limits the top of the threaded column (19); A gear assembly, arranged on the mounting plate (13); A first ball screw (16), with one end passing through the gear assembly and the mounting plate (13), and being in threaded cooperation with the gear assembly and slidably cooperating with the mounting plate (13); one end of the first ball screw (16) is fixedly connected to the top of the threaded column (19).

4. The sampling device for food safety inspection and testing according to claim 3, wherein, The gear assembly includes: A driving gear (14), rotatably arranged on the top of the mounting plate (13); A driven gear (15), rotatably arranged on the top of the mounting plate (13) and meshing with the driving gear (14); the first ball screw (16) passes through the driven gear (15) and is in threaded cooperation with the driven gear (15); A first motor (17), fixedly arranged at the bottom of the mounting plate (13), and its output shaft is in transmission connection with the driving gear (14).

5. The sampling device for food safety inspection and testing according to claim 1, wherein, The annular moving limiting component includes: Two linear driving components, respectively arranged outside the support cylinder (1); A limiting ring (5), connected to the two linear driving components and driven to move along the length direction of the support cylinder (1) synchronously by the two linear driving components.

6. The sampling device for food safety inspection and testing according to claim 5, characterized in that, The linear driving component includes: A guide rail (10), fixedly arranged outside the support cylinder (1); A moving block (6), slidably arranged in the guide rail (10); the two moving blocks (6) of the two linear driving components are respectively fixedly connected to the limiting ring (5); A second ball screw (11), passing through the moving block (6) and being in threaded cooperation with the moving block (6); both ends of the second ball screw (11) are respectively rotatably cooperated with the two ends of the guide rail; The second motor (12) is fixedly arranged at one end of the guide rail (10), and its output shaft is in transmission connection with the second ball screw (11).

7. The sampling device for food safety inspection and testing according to claim 5, characterized in that, A limit sensor (4) is arranged at the top of the limit ring (5); the limit sensor (4) is located directly below the limit plate (3).

8. The sampling device for food safety inspection and testing according to claim 2, wherein, The elastic sampling unit includes: A reference plate (22) is slidably arranged in the support cylinder (1); the top of the reference plate (22) is fixedly connected to the sampling ring (18) through two fixing rods (23); A feed rod (9) has one end passing through the reference plate (22) and is in sliding fit with the reference plate (22); a positioning plate (20) is fixedly arranged at one end of the feed rod (9); A return spring (21) is sleeved on the feed rod (9), and its two ends are respectively connected to the bottom of the positioning plate (20) and the top of the reference plate (22); A support rod (8) has one end fixedly connected to the bottom of the reference plate (22); the multi-chamber piston includes a sampling cylinder (7), a piston rod (25) and a plurality of piston plates (24); the plurality of piston plates (24) are fixedly arranged in an array on the rod body of the piston rod (25), one end of the piston rod (25) is fixedly connected to the other end of the feed rod (9); the plurality of piston plates (24) are in sliding fit with the sampling cylinder (7); the other end of the support rod (8) is fixedly connected to the outer side wall of the sampling cylinder (7).

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