A pre-treatment device for food sample detection

Abstract

This invention relates to the field of food testing, specifically to a pre-treatment device for food sample testing. The device includes a support, a processing tank, and a purification assembly. The processing tank is mounted on the support, and a sieving tank is rotatably connected to it. One end of the sieving tank penetrates the upper surface of the processing tank and extends above it. In this invention, a drive assembly enables the central first cutter, the circumferential array of second cutters, and the sieving tank to rotate in opposite directions. Combined with the meshing transmission of a ring tooth and a third gear, the secondary cutter rotates on its own axis while revolving with the sieving tank, creating a multi-dimensional, high-intensity crushing effect. This effectively solves the defects of traditional single cutters, which easily cause samples to stick to the inner wall of the crushing cylinder and result in insufficient crushing. It significantly improves sample crushing efficiency and uniformity. Simultaneously, the synchronous reverse rotation of the sieving tank allows for real-time sieving of the crushed sample, achieving integrated crushing and sieving operations and further improving pre-treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of food testing technology, and more specifically to a pretreatment device for food sample testing. Background Technology

[0002] Food testing plays a vital role in ensuring food safety, protecting consumer rights, promoting the healthy development of the food industry, meeting legal and regulatory requirements, and addressing international trade challenges. Therefore, strengthening food testing is of great significance for maintaining social stability and promoting economic development. After food samples are taken, they are pre-processed to ensure the accuracy of the test results.

[0003] In existing technologies, food samples are typically processed manually in steps, requiring dispersed equipment, which presents the following problems: First, using separate crushing, sieving, and extraction equipment necessitates multiple manual transfers of samples, easily leading to loss of target substances, cross-contamination, and large fluctuations in detection recovery rates; Second, sample crushing relies solely on a rotating cutter, causing samples to be easily thrown off the inner wall of the crushing cylinder, resulting in low crushing efficiency and poor results; Third, food samples are tested in both solid and liquid states, and a single pretreatment device cannot meet the diverse needs.

[0004] Therefore, the present invention provides a pretreatment device for food sample testing to solve the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, this invention provides a pretreatment device for food sample testing. This device addresses the problems of using separate crushing, sieving, and extraction equipment, which requires multiple manual transfers of samples, easily leading to loss of target materials, cross-contamination, and large fluctuations in detection recovery rates. Furthermore, the crushing of samples relies solely on a rotating cutter, causing samples to be easily thrown off the inner wall of the crushing cylinder, resulting in slow crushing efficiency and poor results. Moreover, food samples can be tested in both solid and liquid states, and a single pretreatment device cannot meet the different needs.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pretreatment device for food sample testing includes a support, a processing tank, and a purification component.

[0007] The processing tank is mounted on a bracket, and a screening tank is rotatably connected to the processing tank. One end of the screening tank penetrates the upper surface of the processing tank and extends to the top of the processing tank. The other end of the screening tank has a filter hole located inside the processing tank. A feed pipe is fixedly connected to the screening tank, and a sealing dish is threaded onto the screening tank.

[0008] The screening tank is vertically rotatably connected to a first cutter and several second cutters, and the multiple second cutters are arranged in a circular array with the first cutter as the center. The support is provided with a drive assembly for synchronously driving the first cutter, the second cutters and the screening tank to rotate, and the first cutter rotates in the opposite direction to the screening tank.

[0009] The purification component is detachably installed inside the processing tank and is used to purify the pulverized liquid sample.

[0010] In some embodiments, the support includes a base and an upright plate, the bottom end of the upright plate being vertically fixed to the upper surface of the base, and a reinforcing plate being installed at the connection between the base and the upright plate.

[0011] In some embodiments, the processing tank includes an upper tank and a lower tank. The bottom of the upper tank is provided with an opening, and a reinforcing ring is fixedly connected to the middle of the upper tank. One end of the reinforcing ring is fixedly connected to a vertical plate. The lower tank is detachably installed at the bottom of the upper tank. A discharge pipe is fixedly connected to the bottom surface of the lower tank, and a plug is threaded onto the discharge pipe.

[0012] In some embodiments, the bottom end of the upper tank and the inner wall of the lower tank are both provided with threads, and the lower tank is threadedly connected to the upper tank.

[0013] In some embodiments, the lower tank is installed at the bottom of the upper tank via a snap-fit ​​structure.

[0014] In some embodiments, the first cutter includes a rotating spindle rotatably connected to a screening tank, on which are fixedly connected main crushing blades arranged at equal intervals, and the main crushing blades are located inside the screening tank.

[0015] In some embodiments, the second cutter includes a rotary sub-shaft rotatably connected to a screening tank, on which are fixedly connected secondary crushing blades arranged at equal intervals, and the secondary crushing blades are located inside the screening tank.

[0016] In some embodiments, the drive assembly includes a first gear, a second gear, a geared motor, and a transmission structure. The output shaft of the geared motor is mounted on a drive shaft. The first gear is mounted on the drive shaft, and the second gear is mounted on the screening tank. A through slot is provided on the vertical plate. A portion of the first gear passes through the through slot and meshes with the second gear. The drive shaft is connected to the rotating main shaft via the transmission structure.

[0017] In some embodiments, the transmission structure is a combination of a synchronous belt and a synchronous pulley.

[0018] In some embodiments, the transmission structure is a combination of a belt and a pulley.

[0019] In some embodiments, the transmission structure is a combination of chain and sprocket.

[0020] In some embodiments, the drive assembly includes a protective shell and a support plate fixedly connected to the upright plate, the geared motor is located inside the protective shell, the support plate has a through hole, the inner wall of the through hole is fixedly connected with an annular tooth, and a third gear is fixedly connected to each of the rotary sub-shafts, and the third gear meshes with the annular tooth.

[0021] In some embodiments, the purification assembly includes a filter plate with equally spaced purification chambers. Each purification chamber has a communicating cavity in its inner bottom wall. Purification packing is installed in each purification chamber. A limit block is fixedly connected to the inner wall of the lower tank. The filter plate has a slot that matches the limit block.

[0022] In some embodiments, a liquid inlet chamber is formed within the purification chamber through the upper surface of the purification packing, and the liquid inlet chamber is connected to the connecting chamber through the purification packing.

[0023] The beneficial effects of this invention are as follows: 1. In this invention, the integrated structure integrates multiple processes such as crushing, sieving, and purification into the same processing tank, eliminating the need for multiple manual sample transfers. This effectively avoids problems such as loss of target analytes and cross-contamination during sample transfer, significantly improving the stability and consistency of the detection recovery rate. At the same time, it simplifies the operation process, reduces human error, and ensures the accuracy and reliability of food testing results.

[0024] 2. The drive assembly enables the central first cutter, the circumferential array second cutter, and the screening tank to rotate in opposite directions. Combined with the meshing transmission of the ring tooth and the third gear, the secondary cutter rotates on its own axis while revolving with the screening tank, forming a multi-dimensional and high-intensity crushing action. This effectively solves the defects of traditional single cutters that easily cause samples to stick to the inner wall of the crushing cylinder and result in insufficient crushing. It significantly improves the sample crushing efficiency and crushing uniformity. At the same time, the synchronous reverse rotation of the screening tank can complete the sieving of the crushed sample in real time, realizing the integrated operation of crushing and sieving, and further improving the pretreatment efficiency. Attached Figure Description

[0025] Figure 1 This is a perspective view of the overall structure of the present invention.

[0026] Figure 2 For the present invention Figure 1 An enlarged schematic diagram of the structure at point A in the middle.

[0027] Figure 3 This is a schematic diagram illustrating one connection method between the upper tank and the lower tank in this invention.

[0028] Figure 4 This is a cross-sectional view of the overall structure of the present invention.

[0029] Figure 5 This is a partial structural diagram of the driving component of the present invention.

[0030] Figure 6 This is a schematic diagram of the purification component of the present invention within the lower tank.

[0031] Figure 7 This is a schematic diagram of the structure of the purification component of the present invention after it has been removed from the lower tank.

[0032] Figure 8 This is a schematic diagram illustrating another connection method between the upper tank and the lower tank in this invention.

[0033] In the picture: 1. Base; 2. Vertical plate; 3. Reinforcing ring; 4. Upper tank; 5. Lower tank; 6. Screening tank; 7. Rotating main shaft; 8. Main crushing blade; 9. Rotating secondary shaft; 10. Secondary crushing blade; 11. Feed pipe; 12. Protective shell; 13. Bearing plate; 14. First gear; 15. Second gear; 16. Ring gear; 17. Third gear; 18. Through groove; 19. Gear motor; 20. Drive shaft; 21. Transmission structure; 22. Feed pipe; 23. Plug; 24. Filter plate; 25. Purification chamber; 26. Connecting chamber; 27. Purification packing; 28. Slot; 29. ​​Limiting block; 30. Snap-fit ​​structure; 31. Filter hole; 32. Sealing dish. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, 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 of the invention and are not intended to limit the invention. Example

[0035] Please see Figures 1 to 5 As shown, the present invention provides a pretreatment device for food sample testing, including a support, a processing tank, and a purification component.

[0036] The processing tank is mounted on a bracket, and a screening tank 6 is rotatably connected to the processing tank. One end of the screening tank 6 passes through the upper surface of the processing tank and extends to the top of the processing tank. The other end of the screening tank 6 is provided with a filter hole 31, which is located inside the processing tank. A feed pipe 11 is fixedly connected to the screening tank 6, and a sealing dish 32 is threadedly connected to the screening tank 6.

[0037] The sieving tank 6 is a cylindrical structure with a closed top and an open bottom. The feed pipe 11 is located on the sieving tank 6 and can pour food samples into the interior of the sieving tank 6 through the feed pipe 11. The sealing dish 32 can block the opening of the sieving tank 6, and the sealing dish 32 is also designed with filter holes 31.

[0038] The removable sealing dish 32 allows for the discharge of raw material residue remaining in the screening tank 6 after the sealing dish 32 is removed from the screening tank 6.

[0039] The screening tank 6 is vertically rotatably connected to a first cutter and several second cutters, and the multiple second cutters are arranged in a circular array with the first cutter as the center. The support is provided with a drive assembly for synchronously driving the first cutter, the second cutters and the screening tank 6 to rotate, and the first cutter rotates in the opposite direction to the screening tank 6.

[0040] With the synchronous rotation of the first and second cutters, food raw materials can be cut and crushed. When the screening tank 6 rotates in the opposite direction, the filter holes 31 on the screening tank 6 can be used to screen the crushed sample.

[0041] The purification component is detachably installed inside the processing tank and is used to purify the pulverized liquid sample.

[0042] Based on the above embodiments, the bracket includes a base 1 and an upright plate 2. The bottom end of the upright plate 2 is fixedly connected to the upper surface of the base 1 in a vertical direction, and a reinforcing plate is installed at the connection between the base 1 and the upright plate 2.

[0043] The base 1 and the upright plate 2 form an L-shaped structure. The base 1 is located below the processing tank and can be used to place containers on the base 1 to collect the raw materials discharged from the processing tank.

[0044] Furthermore, the processing tank includes an upper tank 4 and a lower tank 5. The bottom end of the upper tank 4 is provided with an opening, and a reinforcing ring 3 is fixedly connected to the middle of the upper tank 4. One end of the reinforcing ring 3 is fixedly connected to the vertical plate 2. The lower tank 5 is detachably installed at the bottom end of the upper tank 4. The bottom surface of the lower tank 5 is fixedly connected to a discharge pipe 22, and a plug 23 is threadedly connected to the discharge pipe 22.

[0045] The upper tank 4 is fixed to the vertical plate 2 by means of the reinforcing ring 3. The lower tank 5 can cover the bottom opening of the upper tank 4. The bottom surface of the lower tank 5 is conical. The sample collected in the lower tank 5 is discharged through the discharge pipe 22. When there is no need to discharge, the discharge pipe 22 is sealed by the plug 23.

[0046] Preferably, the bottom end of the upper tank 4 and the inner wall of the lower tank 5 are both provided with threads, and the lower tank 5 is threadedly connected to the upper tank 4.

[0047] The upper tank 4 and lower tank 5 are detachably connected, which facilitates the cleaning of residues in the upper tank 4. After the lower tank 5 is removed from the upper tank 4, it is also convenient to remove the sealing dish 32 from the screening tank 6.

[0048] Furthermore, the first cutter includes a rotating spindle 7 rotatably connected to the screening tank 6, and main crushing blades 8 arranged at equal intervals are fixedly connected to the rotating spindle 7, and the main crushing blades 8 are located inside the screening tank 6.

[0049] The rotating spindle 7 is located on the central axis of the sieving tank 6. As the main rotary cutting part, the main spindle 7 rotates and, with the help of the main crushing blade 8, completes the cutting and crushing of the sample in the sieving tank 6.

[0050] Preferably, the second cutter includes a rotary sub-shaft 9 rotatably connected to the screening tank 6, and secondary crushing blades 10 arranged at equal intervals are fixedly connected to the rotary sub-shaft 9, and the secondary crushing blades 10 are located inside the screening tank 6.

[0051] The rotary sub-shaft 9 serves as an auxiliary rotary cutting component. When the screening tank 6 rotates, it drives the rotary sub-shaft 9 to perform synchronous circular motion. When the rotary sub-shaft 9 rotates on its own, it assists in the crushing of the sample with the help of the auxiliary crushing blade 10.

[0052] Furthermore, the drive assembly includes a first gear 14, a second gear 15, a geared motor 19, and a transmission structure 21. The output shaft of the geared motor 19 is equipped with a drive shaft 20. The first gear 14 is mounted on the drive shaft 20, and the second gear 15 is mounted on the screening tank 6. A through groove 18 is provided on the vertical plate 2. Part of the first gear 14 passes through the through groove 18 and meshes with the second gear 15. The drive shaft 20 is connected to the rotating main shaft 7 through the transmission structure 21.

[0053] The output shaft of the geared motor 19 drives the drive shaft 20 to rotate, which in turn drives the main shaft 7 to rotate in the same direction through the transmission structure 21.

[0054] The drive shaft 20 drives the screening tank 6 to rotate via the first gear 14 and the second gear 15. At this time, the rotation direction of the screening tank 6 is opposite to that of the drive shaft 20, that is, the rotation direction of the screening tank 6 is opposite to that of the rotating main shaft 7.

[0055] In this embodiment, there are three design methods for the transmission structure 21.

[0056] That is, the transmission structure 21 is a combination structure of synchronous belt and synchronous pulley.

[0057] Alternatively, the transmission structure 21 may be a combination of a belt and a pulley.

[0058] Alternatively, the transmission structure 21 may be a combination of chain and sprocket.

[0059] The transmission structure 21 is used to complete the transmission between the drive shaft 20 and the rotating spindle 7.

[0060] Preferably, the drive assembly includes a protective shell 12 and a support plate 13 fixedly connected to the upright plate 2. The geared motor 19 is located inside the protective shell 12. The support plate 13 has a through hole, and the inner wall of the through hole is fixedly connected with an annular tooth 16. Each rotary subshaft 9 is fixedly connected with a third gear 17, and the third gear 17 meshes with the annular tooth 16.

[0061] When the screening tank 6 rotates, the screening tank 6 will drive the rotating secondary shaft 9 to perform synchronous circular motion, so that the third gear 17 on the rotating secondary shaft 9 will mesh with the ring tooth 16 during the circular motion of the rotating secondary shaft 9, thereby causing the rotating secondary shaft 9 to perform circular self-rotation.

[0062] The working principle of this embodiment is as follows: In use, the food sample is poured into the screening tank 6 through the feed pipe 11. The geared motor 19 is started, and the output shaft of the geared motor 19 drives the drive shaft 20 to rotate. The drive shaft 20 drives the rotating main shaft 7 to rotate in the same direction through the transmission structure 21. After the rotating main shaft 7 rotates, it uses the main crushing blade 8 to cut and crush the sample in the screening tank 6. At the same time, the drive shaft 20 drives the screening tank 6 to rotate through the first gear 14 and the second gear 15. The rotation direction of the screening tank 6 is opposite to that of the rotating main shaft 7. When the screening tank 6 rotates, it drives the rotating auxiliary shaft 9 to rotate synchronously. In the circular motion, the third gear 17 on the rotating secondary shaft 9 meshes with the ring gear 16 during the circular motion of the rotating secondary shaft 9, thereby causing the rotating secondary shaft 9 to rotate in a circular motion. The auxiliary crushing blade 10 completes the auxiliary crushing of the sample. When the sieving tank 6 rotates in the opposite direction, the filter holes 31 on the sieving tank 6 can be used to sieve the crushed sample. The sieved liquid sample falls into the lower tank 5 and is purified by the purification component. After the purification is completed, the plug 23 is opened and the sample collected in the lower tank 5 is discharged through the feed pipe 22. Example

[0063] The difference between this embodiment and Embodiment 1 is that: Figures 6 to 8 As shown, the lower tank 5 is installed at the bottom of the upper tank 4 via a snap-fit ​​structure 30.

[0064] The lower tank 5 and the upper tank 4 can be connected by clips and blocks, allowing the lower tank 5 to be removed from the upper tank 4 for cleaning.

[0065] Furthermore, the purification assembly includes a filter plate 24, on which purification chambers 25 are arranged at equal intervals. Each purification chamber 25 has a connecting chamber 26 on its inner bottom wall. Purification packing material 27 is installed in the purification chamber 25. A limiting block 29 is fixedly connected to the inner wall of the lower tank 5. A slot 28 matching the limiting block 29 is provided on the filter plate 24.

[0066] The sample filtered through filter hole 31 will enter the purification chamber 25 and be purified by the purification packing 27. The purified clarified liquid will fall into the feed pipe 22 through the connecting chamber 26.

[0067] When it is not necessary to purify the solid sample, the filter plate 24 can be removed from the purification packing 27 via the slot 28, thereby removing the filter plate 24 from the upper tank 4, so that the sample filtered by the filter hole 31 falls directly into the inside of the feed pipe 22.

[0068] Preferably, a liquid inlet chamber is formed in the purification chamber 25 through the upper surface of the purification packing 27, and the liquid inlet chamber is connected to the connecting chamber 26 through the purification packing 27.

[0069] The liquid inlet chamber allows for the brief collection of liquid filtered through the filter hole 31, enabling the liquid sample to be purified by the purification packing 27 within the purification chamber 25.

[0070] The usage process in this embodiment is as follows: First, the solid sample is placed in the upper tank 4 and initially filtered through the filter holes 31 to remove larger particulate impurities. Then, the sample enters the inlet chamber of the purification chamber 25 for brief collection. Next, under the continuous action of the purification packing 27, tiny impurities and harmful substances in the sample are effectively adsorbed or decomposed, achieving deep purification. The purified clarified liquid flows smoothly into the discharge pipe 22 through the connecting chamber 26, completing the entire purification process. When cleaning the inside of the upper tank 4 is required, the lower tank 5 can be easily removed using the snap-fit ​​structure 30 to thoroughly clean the inside of the upper tank 4, ensuring hygiene and safety for the next use.

[0071] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0072] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A pretreatment device for food sample testing, characterized in that, Includes support frame, treatment tank, and purification components; The processing tank is mounted on a bracket, and a screening tank (6) is rotatably connected to the processing tank. One end of the screening tank (6) penetrates the upper surface of the processing tank and extends to the top of the processing tank. The other end of the screening tank (6) is provided with a filter hole (31), and the filter hole (31) is located inside the processing tank. A feed pipe (11) is fixedly connected to the screening tank (6), and a sealing dish (32) is threadedly connected to the screening tank (6). The screening tank (6) is vertically rotatably connected to a first cutter and several second cutters, and the multiple second cutters are arranged in a circular array with the first cutter as the center. The support is provided with a drive assembly for synchronously driving the first cutter, the second cutters and the screening tank (6) to rotate, and the first cutter and the screening tank (6) rotate in opposite directions. The purification component is detachably installed inside the processing tank and is used to purify the pulverized liquid sample.

2. The pretreatment device for food sample testing according to claim 1, characterized in that, The bracket includes a base (1) and an upright plate (2). The bottom end of the upright plate (2) is fixedly connected to the upper surface of the base (1) in the vertical direction. A reinforcing plate is installed at the connection between the base (1) and the upright plate (2).

3. The pretreatment device for food sample testing according to claim 2, characterized in that, The processing tank includes an upper tank (4) and a lower tank (5). The bottom end of the upper tank (4) is provided with an opening. A reinforcing ring (3) is fixedly connected to the middle of the upper tank (4), and one end of the reinforcing ring (3) is fixedly connected to the vertical plate (2). The lower tank (5) is detachably installed at the bottom end of the upper tank (4). The bottom surface of the lower tank (5) is fixedly connected to a discharge pipe (22), and a plug (23) is threaded onto the discharge pipe (22).

4. The pretreatment device for food sample testing according to claim 3, characterized in that, The bottom end of the upper tank (4) and the inner wall of the lower tank (5) are both provided with threads, and the lower tank (5) is threadedly connected to the upper tank (4). Alternatively, the lower tank (5) may be installed at the bottom of the upper tank (4) via a snap-fit ​​structure (30).

5. The pretreatment device for food sample testing according to claim 1, characterized in that, The first cutter includes a rotating spindle (7) rotatably connected to the screening tank (6), and a main crushing blade (8) arranged at equal intervals is fixedly connected to the rotating spindle (7), and the main crushing blade (8) is located inside the screening tank (6); The second cutter includes a rotating sub-shaft (9) rotatably connected to the screening tank (6), on which are fixedly connected secondary crushing blades (10) arranged at equal intervals, and the secondary crushing blades (10) are located inside the screening tank (6).

6. The pretreatment device for food sample testing according to claim 5, characterized in that, The drive assembly includes a first gear (14), a second gear (15), a geared motor (19), and a transmission structure (21). The output shaft of the geared motor (19) is equipped with a drive shaft (20). The first gear (14) is mounted on the drive shaft (20), and the second gear (15) is mounted on the screening tank (6). A through groove (18) is provided on the vertical plate (2). Part of the first gear (14) passes through the through groove (18) and meshes with the second gear (15). The drive shaft (20) is connected to the rotating main shaft (7) through the transmission structure (21).

7. The pretreatment device for food sample testing according to claim 6, characterized in that, The transmission structure (21) is a combination of synchronous belt and synchronous pulley; Alternatively, the transmission structure (21) may be a combination of a belt and a pulley. Alternatively, the transmission structure (21) may be a combination of chain and sprocket.

8. The pretreatment device for food sample testing according to claim 5, characterized in that, The drive assembly includes a protective shell (12) and a support plate (13) fixedly connected to the upright plate (2). The geared motor (19) is located inside the protective shell (12). The support plate (13) has a through hole. The inner wall of the through hole is fixedly connected with an annular tooth (16). Each of the rotary subshafts (9) is fixedly connected with a third gear (17), and the third gear (17) meshes with the annular tooth (16).

9. The pretreatment device for food sample testing according to claim 2, characterized in that, The purification assembly includes a filter plate (24), on which are arranged equally spaced purification chambers (25). Each purification chamber (25) has a connecting chamber (26) on its inner bottom wall. Purification packing (27) is installed in the purification chamber (25). A limiting block (29) is fixedly connected to the inner wall of the lower tank (5). A slot (28) matching the limiting block (29) is provided on the filter plate (24).

10. A pretreatment device for food sample testing according to claim 9, characterized in that, The purification chamber (25) is formed by the upper surface of the purification packing (27) to form an inlet chamber, and the inlet chamber is connected to the connecting chamber (26) through the purification packing (27).

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