Milk powder quality testing device with layered multi-point sampling structure

Abstract

This application discloses a milk powder quality testing device with a layered multi-point sampling structure, relating to the technical field of milk powder sampling and testing. It includes: a sampling mechanism comprising a probe insertable into a can; a sampling port on the side wall of the probe, a sampling chamber communicating with the sampling port, and a movable sealing plate for opening and closing the sampling port; a triggering unit capable of synchronously driving all movable sealing plates to open the sampling port; and a suction unit for sucking milk powder into the corresponding sampling chamber through a suction tube. This application, through the cooperation of a screw pair, converts the linear motion of the push rod into the rotation of the central drive shaft, and synchronously opens all movable sealing plates through a gear transmission system, enabling in-situ instantaneous sampling. Simultaneously, the push rod drives the piston to move within the pressure chamber, generating negative pressure, which actively sucks milk powder at the corresponding depth into the sampling chamber. When the probe is lifted, the mechanism reverses its action, and the movable sealing plates close synchronously, completing sealed sampling and effectively preventing interlayer contamination.

Description

Technical Field

[0001] This application relates to the technical field of milk powder sampling and testing, and more specifically, to a milk powder quality testing device with a layered multi-point sampling structure. Background Technology

[0002] As an important source of nutrition, the quality and safety of infant formula are of paramount importance. During the production, storage, and inspection stages of infant formula, it is often necessary to collect samples from different depths within the packaging can for testing to assess the uniformity of its composition, detect potential contaminants, or conduct quality monitoring. Because infant formula may stratify or segregate during transportation and storage due to differences in particle size and density, collecting samples from only the surface or a single depth cannot represent the overall quality. Therefore, stratified sampling is a crucial step in obtaining representative samples.

[0003] Currently, sampling mainly relies on two methods: manual sampling and instrumental sampling. However, the inventors realized that manual sampling using a long-handled spoon at different depths relies entirely on experience for depth control, resulting in poor repeatability. Furthermore, the operation severely disrupts the original layered state of the milk powder, leading to sample distortion. Common instrumental sampling mainly involves single-tube multiple insertion, which can pinpoint the sample, but requires repeated insertion, causing continuous disturbance to the material inside the can. Moreover, it can only obtain a mixed sample at one depth point at a time, resulting in low efficiency and the risk of interlayer mixing.

[0004] Based on the above issues, we provide a milk powder quality testing device with a stratified multi-point sampling structure. Summary of the Invention

[0005] To address the problems mentioned in the background art, this application provides a milk powder quality testing device with a layered multi-point sampling structure.

[0006] The milk powder quality testing device with a layered multi-point sampling structure provided in this application adopts the following technical solution:

[0007] A milk powder quality testing device with a layered multi-point sampling structure includes: a sampling mechanism, which includes a probe that can be inserted into a can, and the probe is provided with at least two sampling units distributed along its axial direction;

[0008] Each of the sampling units includes a sampling port opened on the side wall of the probe, a sampling cavity communicating with the sampling port, and a movable sealing plate for opening and closing the sampling port;

[0009] A triggering unit is located at the bottom of the probe rod. The triggering unit is configured to synchronously drive all the movable sealing plates to open the sampling port when the probe rod is inserted into the tank and subjected to pressure.

[0010] The suction unit includes a pressure chamber disposed inside the probe and a suction pipe connecting each of the sampling chambers and the pressure chamber. The trigger unit is mechanically connected to the suction unit, so that when the trigger unit is pressed, it can change the volume of the pressure chamber to generate negative pressure, thereby sucking the milk powder into the corresponding sampling chamber through the suction pipe.

[0011] The sample transfer mechanism includes a delivery pipeline connected to each of the sampling chambers, and a negative pressure component for sequentially transferring milk powder from each sampling chamber to an external testing container via the delivery pipeline.

[0012] In some embodiments, the movable sealing plate is equipped with a rotating shaft at both its upper and lower ends, and the movable sealing plate is rotatably mounted inside the side wall of the probe rod via the rotating shaft.

[0013] In some embodiments, a micro gear is fitted onto the rotating shaft of each of the movable sealing plates;

[0014] A central drive shaft is rotatably mounted inside the probe rod along the axial direction, and a drive gear that meshes with each of the micro gears is fitted on the central drive shaft.

[0015] In some embodiments, the triggering unit includes an end sleeve fixedly installed at the bottom end of the probe rod, and a contact rod slidably installed within the end sleeve;

[0016] The top end of the contact rod is connected to a push rod that extends into the probe rod, and the push rod is connected to the central drive shaft via a screw pair;

[0017] A return spring is provided between the contact rod and the end sleeve.

[0018] In some embodiments, the pressure chamber of the suction unit is located inside the probe, and the push rod slides through the pressure chamber;

[0019] A one-way piston is fixedly sleeved on the top rod section located in the pressure chamber, and the one-way piston is in a sealing sliding fit with the inner wall of the pressure chamber;

[0020] One end of each suction tube is connected to the corresponding sampling chamber, and the other end is connected to the pressure chamber. A breathable filter membrane is installed at the port of each suction tube.

[0021] In some embodiments, the sample transfer mechanism includes a container box containing a buffer box;

[0022] The buffer box is equipped with a rotary multi-way valve on its upper part. The valve body of the rotary multi-way valve is equipped with multiple pipeline interfaces and a common outlet.

[0023] Each of the aforementioned delivery pipelines is connected to each of the aforementioned pipeline interfaces, and the common outlet is connected to the top of the buffer box;

[0024] The rotary multi-way valve has a valve core rotatably mounted inside, and a knob is connected to the top of the valve core.

[0025] In some embodiments, the negative pressure assembly includes an extraction pipe in communication with the buffer box and a vacuum pump connected to the extraction pipe.

[0026] In some implementations, the bottom of the buffer box is provided with an openable and closable bottom cover.

[0027] In some embodiments, the container box also has a rotatable tray located below the buffer box, on which multiple sample boxes are placed.

[0028] In some implementations, a breathable filter membrane is also provided at the port of the extraction pipe located inside the buffer box.

[0029] In summary, in the technical solution of this application embodiment, when the probe at the bottom is pressed and moves upward, the protrusion of its top rod cooperates with the spiral groove of the drive shaft to convert linear motion into rotation, and the movable sealing plate of each sampling port is opened synchronously through the gear set, which can realize in-situ instantaneous sampling. At the same time, the top rod drives the piston to move in the pressure chamber to generate negative pressure, and the milk powder at the corresponding depth is actively sucked into the sampling chamber through the pipeline. When the probe is lifted, the mechanism moves in the opposite direction, and the movable sealing plate closes synchronously to complete the sealed sampling, which can effectively avoid interlayer contamination.

[0030] During sample transfer, the valve core of the rotary multi-way valve sequentially selects different pipelines, and under the action of the vacuum pump, each layer of milk powder is directionally blown to an independent sample box. The whole process is closed and automatic, thus fully ensuring the purity and traceability of the samples. Attached Figure Description

[0031] Figure 1 This is a cross-sectional schematic diagram of the testing device of this application;

[0032] Figure 2 This is a cross-sectional schematic diagram of the sampling facility used in this application;

[0033] Figure 3 This is an exploded view of the sampling organization in this application;

[0034] Figure 4 This is a schematic diagram of the structure of the activity sealing plate in the open state of this application;

[0035] Figure 5 This application Figure 2 Enlarged structural diagram of section A;

[0036] Figure 6 This is a cross-sectional schematic diagram of the sample transfer mechanism of this application;

[0037] Figure 7 This is a cross-sectional schematic diagram of the buffer box and rotary multi-way valve of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 200. Sampling mechanism; 201. Probe; 202. Sampling chamber; 203. Movable sealing plate; 204. Rotating shaft; 205. Micro gear; 206. Drive gear; 207. Central drive shaft; 208. End sleeve; 209. Contact rod; 210. Push rod; 211. Return spring; 212. Protrusion; 213. Pressure chamber; 214. One-way piston; 215. Suction pipeline; 216. Delivery pipeline;

[0040] 300. Sample transfer mechanism; 301. Container box; 302. Buffer box; 303. Rotary multi-way valve; 304. Valve core; 305. Knob; 306. Pipeline interface; 307. Vacuum tube; 308. Vacuum pump; 309. Bottom cover; 310. Tray; 311. Sample box. Detailed Implementation

[0041] The following is in conjunction with the appendix Figures 1 to 7 The present invention will be described in further detail below.

[0042] In the description of this application, it should be understood that the terms "thickness," "upper," "top," "bottom," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] It should be noted that the accompanying drawings are schematic and not to scale. For clarity and convenience, the relative dimensions and proportions of the parts shown are exaggerated or reduced in size; all dimensions are merely illustrative and not limiting. Furthermore, the same reference numerals are used for the same structures, elements, or fittings appearing in more than two drawings to indicate similar features.

[0044] In related technologies, when manual layering is used for sampling, operators use long-handled sampling spoons and rely on experience to manually dig samples at different depths. Although this method is intuitive, it has obvious drawbacks: First, the sampling depth is extremely inaccurate and has poor repeatability; second, the operation process severely damages the original structure of the milk powder in the can, causing the powder in the upper layer to fall into the lower layer, resulting in serious sample distortion; third, open operation is prone to introducing environmental pollution and moisture, and is inefficient, failing to meet the standardized requirements of modern quality control.

[0045] When mechanical cannulation sampling is used, a hollow probe with a sample inlet groove on the side wall is inserted to a certain depth to obtain the mixed sample of that layer. After that, it is pulled out, cleaned, and then inserted to the next depth. Although this method is an improvement over manual sampling, it also has many drawbacks: First, repeated insertion causes repeated disturbance to the contents of the container; second, only a mixed sample of one depth can be obtained each time, and it is impossible to obtain the original samples of each layer in the "instantaneously frozen" state; third, the operation is cumbersome, and there is a risk of the sample mixing inside the tube during the extraction process.

[0046] Reference Figures 1 to 7 As shown, the milk powder quality testing device of this application is mainly composed of three parts working together: sampling mechanism 200, sample transfer mechanism 300 and conveying pipeline 216 connecting the two. Its core function is to go deep into the milk powder can, obtain milk powder samples at multiple depths in one go, in situ and without pollution, and automatically transfer them to independent containers for testing.

[0047] In this embodiment of the application, the core of the sampling mechanism 200 is a slender probe 201 that can be vertically inserted into the milk powder can. The probe 201 is usually made of stainless steel tube and has sufficient rigidity.

[0048] Specifically, at least two sampling ports are spaced apart along the axial direction (i.e., the length direction) on the side wall of the probe 201. Each sampling port forms an independent sampling cavity 202 inside the probe 201. The opening of each sampling cavity 202 is controlled by a movable sealing plate 203. The shape of the movable sealing plate 203 matches the sampling port. Its upper and lower ends are rotatably installed inside the side wall of the probe 201 through a rotating shaft 204, so that the movable sealing plate 203 can rotate inward or outward like a small door, thereby opening or closing the sampling port.

[0049] Preferably, the number of sampling ports is set to three, and the three sampling ports are spirally distributed along the axial direction of the probe 201, with a circumferential difference of 120 degrees.

[0050] In this embodiment, the sampling cavity 202 is preferably an arc-shaped cavity formed by the tangent part of the sphere and the probe 201. The surface of the movable sealing plate 203 is in close contact with the inner wall of the arc-shaped cavity. When the movable sealing plate 203 rotates, its edge can slide close to the inner wall of the sampling cavity 202. When the sampling port is open, one side of the movable sealing plate 203 will rotate into the sampling cavity 202. Then the suction tube 215 is triggered, and the milk powder in the can will be drawn into the sampling cavity 202 along the opening direction of the movable sealing plate 203. When the probe 201 is taken out, the movable sealing plate 203 automatically resets, so that the milk powder can be retained in the sampling cavity 202.

[0051] In order to achieve the synchronous operation of multiple movable sealing plates 203, in this embodiment of the application, a micro gear 205 is fitted on the rotating shaft 204 at the upper end of each movable sealing plate 203, and a central drive shaft 207 is rotatably installed along the central axis of the probe rod 201. On the central drive shaft 207, a drive gear 206 is fixedly fitted corresponding to the position of each micro gear 205, and each drive gear 206 precisely meshes with its corresponding micro gear 205.

[0052] Therefore, when the central drive shaft 207 rotates, all movable sealing plates 203 can be driven to rotate synchronously and at equal angles through the meshing drive gears 206 and micro gears 205, so as to realize the synchronous opening or closing of all sampling ports.

[0053] Furthermore, the drive gear 206 is hollowed out in the middle, leaving enough space between it and the central drive shaft 207 to allow for the wiring of the subsequent delivery pipe 216.

[0054] Furthermore, such as Figure 2 and Figure 5 As shown, an end sleeve 208 is fixedly installed at the bottom of the probe 201. A contact rod 209 is slidably installed inside the end sleeve 208. The top of the contact rod 209 extends upward and is connected to a top rod 210 that extends into the probe 201. In addition, a return spring 211 is installed between the contact rod 209 and the inner top wall of the end sleeve 208, so that when there is no external force, the contact rod 209 and the top rod 210 are in the lowest initial position.

[0055] The key is that the top outer surface of the push rod 210 is machined with a spiral protrusion 212, while the lower end of the central drive shaft 207 is machined with a spiral groove that fits precisely with it, and the top of the push rod 210 is kept inserted into the central drive shaft 207. These two constitute a spiral pair.

[0056] During operation, when the probe 201 is inserted into the milk powder can and the contact rod 209 finally contacts the bottom of the can, the bottom of the can generates an upward thrust on the contact rod 209, compressing the return spring 211 and driving the push rod 210 to move upward linearly. Due to the presence of the helical pair, the linear motion of the push rod 210 is forcibly converted into the rotational motion of the central drive shaft 207. The rotation of the central drive shaft 207 is then converted into the synchronous rotation of all movable sealing plates 203 through the aforementioned gear transmission system, thereby opening all sampling ports and facilitating the milk powder in the can to enter the sampling chamber 202.

[0057] At the same time, when the movable sealing plate 203 is rotated open, the milk powder inside the can may be pushed aside, forming a smooth inner cavity. At this time, the milk powder will not slide directly into the sampling chamber 202. Therefore, the movement of the trigger unit also directly drives the work of the suction unit. The core of the suction unit is a pressure chamber 213 set in the lower section inside the probe 201. The push rod 210 slides through the pressure chamber 213.

[0058] Specifically, a one-way piston 214 is fixedly sleeved on the top rod 210 section located inside the pressure chamber 213. The outer edge of the one-way piston 214 maintains a sealed sliding fit with the inner wall of the pressure chamber 213, dividing the pressure chamber 213 into upper and lower air chambers. Each sampling chamber 202 has a suction tube 215 connected to its side wall. The other end of all suction tubes 215 converges into the lower air chamber of the pressure chamber 213, so that when a negative pressure is formed in the pressure chamber 213, the milk powder in the can can be sucked into the sampling chamber 202 through the suction tube 215.

[0059] Preferably, at the port where the suction tube 215 extends into the sampling chamber 202, a breathable filter membrane that allows gas to pass through but blocks milk powder particles is installed to prevent milk powder particles from being drawn into the suction tube 215. The one-way piston 214 has a wide range of applications in daily life and industry, such as the cup structure of a manual water pump, which will not be described in detail here.

[0060] As described above, the working principle of the sampling mechanism 200, the triggering unit, and the suction unit is as follows: When the contact rod 209 is pressed, the top rod 210 drives the one-way piston 214 to move upward in the pressure chamber 213. The volume of the lower air chamber of the pressure chamber 213 increases instantaneously, thereby generating a strong instantaneous negative pressure in each sampling chamber 202 through the suction pipe 215. At this time, due to the cooperation of the gear transmission system, all sampling ports can be opened synchronously, and the milk powder at each depth is quickly and actively "sucked" into the corresponding sampling chamber 202 under the negative pressure adsorption, thus completing the sampling.

[0061] After sampling, when the probe 201 is pulled out, the contact rod 209 is reset under the action of the return spring 211. When the one-way piston 214 moves downward, it can connect the upper and lower air chambers in the pressure chamber 213, thereby balancing the pressure. When it moves upward, it fits tightly against the inner wall of the pressure chamber 213, generating an effective negative pressure. When it moves downward, the sealing is reduced, allowing air to slowly seep in, thereby avoiding the generation of a strong positive pressure airflow in the pressure chamber 213 that is enough to blow the sample out of the sampling chamber 202. Subsequently, the movable sealing plate 203 also closes synchronously under the reverse movement of the gear transmission system, sealing the sample in the sampling chamber 202.

[0062] Because the sampling chamber 202 is located inside the probe 201, and the design of the movable sealing plate 203 cannot guide the milk powder in the sampling chamber 202 to pour out, when the movable sealing plate 203 is directly flipped, the milk powder in each sampling chamber 202 will scatter and pour downwards, making it inconvenient to collect. (Refer to...) Figure 1 , Figure 6 , Figure 7 As shown, the sample transfer mechanism 300 is set independently of the sampling mechanism 200. It mainly includes a container box 301. After sampling, each of the delivery pipes 216 on the probe 201 is connected to the sample transfer mechanism 300 to transfer the milk powder in the sampling chamber 202.

[0063] In this embodiment, the core of the sample transfer mechanism 300 is a rotary multi-way valve 303, which is installed above a buffer box 302 inside the container box 301. The rotary multi-way valve 303 has multiple pipeline interfaces 306 on the side of its valve body and a common outlet at its bottom. Each delivery pipeline 216 is connected to a different pipeline interface 306, and the other end of each delivery pipeline 216 is connected to the bottom wall of the corresponding sampling chamber 202.

[0064] Specifically, a valve core 304 is rotatably installed inside the valve body of the rotary multi-way valve 303. The top of the valve core 304 extends out of the valve body and is connected to a knob 305. By manually rotating the knob 305, the position of the flow channel inside the valve core 304 can be changed, so that only one of the pipeline interfaces 306 is connected to the common outlet at the bottom at each time. The common outlet is connected to the top of the buffer box 302 below, so as to transfer the milk powder entering the valve core 304 to the buffer box 302.

[0065] Furthermore, the buffer box 302 is a transparent or semi-transparent sealed container with an openable and closable bottom cover 309. A vacuum pipe 307 is connected to the side of the buffer box 302, and the other end of the vacuum pipe 307 is connected to a vacuum pump 308.

[0066] Specifically, a breathable filter membrane is also provided at the port where the suction pipe 307 extends into the buffer box 302 to prevent milk powder particles from being sucked into the vacuum pump 308 and causing damage. Directly below the buffer box 302, a tray 310 is also installed in the container box 301 via a bearing. The tray 310 has slots and holds multiple independent sample boxes 311. Each sample box 311 is facing the position where the bottom cover 309 of the buffer box 302 can be opened. After the milk powder is transferred into the buffer box 302, the vacuum pump 308 is turned off and the bottom cover 309 is opened to pour the milk powder into the sample box 311 below for subsequent analysis and testing.

[0067] Accordingly, the working process of the sample transfer mechanism 300 is as follows: The operator rotates the knob 305 to connect the valve core 304 to the first pipeline interface 306. The pipeline interface 306 and the corresponding delivery pipeline 216 are connected to the corresponding sampling chamber 202. Then, the vacuum pump 308 is started, and the negative pressure is transmitted through the buffer box 302 and the common outlet to the currently connected delivery pipeline 216 and the corresponding sampling chamber 202. The milk powder in the chamber is carried out as a whole under the action of negative pressure. After passing through the buffer box 302, it falls into the first sample box 311 on the tray 310 directly below under the action of gravity. Then, the operator rotates the tray 310 to move the next empty sample box 311 under the buffer box 302. At the same time, the operator rotates the knob 305 to switch to the next pipeline interface 306. The above process is repeated until the samples of all layers are transferred to the corresponding sample boxes 311 in sequence and independently. The whole process is carried out in a closed system, which can effectively avoid secondary contamination, cross-contamination and personnel contact of the samples.

[0068] All standard parts used in this application can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from the spirit and scope of this application, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A milk powder quality testing device with a layered multi-point sampling structure, characterized in that, include: The sampling mechanism (200) includes a probe (201) that can be inserted into a tank, the probe (201) having at least two sampling units distributed along its axial direction; Each of the sampling units includes a sampling port opened on the side wall of the probe (201), a sampling cavity (202) communicating with the sampling port, and a movable sealing plate (203) for opening and closing the sampling port. A triggering unit is located at the bottom of the probe (201). The triggering unit is configured to synchronously drive all the movable sealing plates (203) to open the sampling port when the probe (201) is inserted into the tank and is under pressure. The suction unit includes a pressure chamber (213) disposed in the probe (201) and a suction pipe (215) connecting each of the sampling chambers (202) and the pressure chamber (213). The trigger unit is mechanically connected to the suction unit, so that when the trigger unit is pressed, it can change the volume of the pressure chamber (213) to generate negative pressure, thereby sucking the milk powder into the corresponding sampling chamber (202) through the suction pipe (215). The sample transfer mechanism (300) includes a delivery pipe (216) connected to each of the sampling chambers (202) respectively, and a negative pressure component for sequentially transferring the milk powder in each sampling chamber (202) to an external testing container via the delivery pipe (216).

2. The milk powder quality testing device with a layered multi-point sampling structure according to claim 1, characterized in that: The movable sealing plate (203) is equipped with a rotating shaft (204) at both the upper and lower ends. The movable sealing plate (203) is rotatably installed inside the side wall of the probe rod (201) via the rotating shaft (204).

3. The milk powder quality testing device with a layered multi-point sampling structure according to claim 2, characterized in that: Each of the movable sealing plates (203) has a micro gear (205) mounted on its rotating shaft (204); A central drive shaft (207) is rotatably mounted inside the probe (201) along the axial direction. A drive gear (206) is fitted on the central drive shaft (207) and meshes with each of the micro gears (205).

4. The milk powder quality testing device with a layered multi-point sampling structure according to claim 3, characterized in that: The triggering unit includes an end sleeve (208) fixedly installed at the bottom of the probe (201), and a contact rod (209) slidably installed in the end sleeve (208). The top end of the contact rod (209) is connected to a top rod (210) that extends into the probe rod (201), and the top rod (210) is connected to the central drive shaft (207) via a screw pair; A return spring (211) is provided between the contact rod (209) and the end sleeve (208).

5. The milk powder quality testing device with a layered multi-point sampling structure according to claim 4, characterized in that: The pressure chamber (213) of the suction unit is located inside the probe (201), and the push rod (210) slides through the pressure chamber (213). A one-way piston (214) is fixedly sleeved on the push rod (210) section located in the pressure chamber (213), and the one-way piston (214) is in a sealing sliding fit with the inner wall of the pressure chamber (213); One end of each suction tube (215) is connected to the corresponding sampling chamber (202), and the other end is connected to the pressure chamber (213). A breathable filter membrane is installed at the port of the suction tube (215).

6. The milk powder quality testing device with a layered multi-point sampling structure according to claim 1, characterized in that: The sample transfer mechanism (300) includes a container box (301), and a buffer box (302) is provided inside the container box (301). The buffer box (302) is provided with a rotary multi-way valve (303) above it. The valve body of the rotary multi-way valve (303) is provided with multiple pipeline interfaces (306) and a common outlet. Each of the aforementioned conveying pipes (216) is connected to each of the aforementioned pipe interfaces (306), and the common outlet is connected to the top of the buffer box (302); The rotary multi-way valve (303) has a valve core (304) rotatably mounted inside, and a knob (305) is connected to the top of the valve core (304).

7. The milk powder quality testing device with a layered multi-point sampling structure according to claim 6, characterized in that: The negative pressure assembly includes an air extraction pipe (307) connected to the buffer box (302) and a vacuum pump (308) connected to the air extraction pipe (307).

8. The milk powder quality testing device with a layered multi-point sampling structure according to claim 6, characterized in that: The bottom of the cache box (302) is provided with an openable and closable bottom cover (309).

9. The milk powder quality testing device with a layered multi-point sampling structure according to claim 6, characterized in that: The container box (301) also has a tray (310) located below the buffer box (302) inside, and multiple sample boxes (311) are placed on the tray (310).

10. The milk powder quality testing device with a layered multi-point sampling structure according to claim 7, characterized in that: The exhaust pipe (307) is also equipped with a breathable filter membrane at the port inside the buffer box (302).

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