A food product aseptic sampling device

Abstract

The application relates to the technical field of food detection, and discloses a food sterile sampling sampling device; the device is composed of two end pipes and one middle pipe to form a sampling pipe with three independent chambers; each chamber is provided with a liquid inlet hole and is controlled to be opened and closed through an adjusting blocking ring; rotating a rotating rod can synchronously open or close all the liquid inlet holes through linkage of the first connecting rod and the second connecting rod; only one-time insertion can complete equal sampling of lower-layer, middle-layer and upper-layer liquids of the liquid food at the same time, sampling efficiency is improved, and the risk of bacterial contamination is reduced; after sampling is completed, lifting a matched sleeve can make a plugging block open a liquid outlet hole, three layers of liquids are mixed and discharged for detection, meanwhile, the end pipe and the middle pipe can be telescopically adjusted to adapt to containers with different depths; the application can complete equal layered sampling at one time, reduces operation errors and pollution introduction, is suitable for different containers, and has no cross residue after being disassembled and cleaned after use; the application has the advantages of compact structure, convenient operation, high sampling efficiency and good representativeness.

Description

Technical Field

[0001] This invention relates to the field of food testing technology, specifically to a food aseptic sampling device. Background Technology

[0002] In the quality and safety testing of liquid foods, sampling is the primary step determining the accuracy of the test results. For liquid foods such as milk, cooking oil, beverages, and condiments, their components often separate during storage and transportation due to factors such as gravity settling, temperature fluctuations, or prolonged standing. The upper layer may be rich in lipids, the lower layer may contain solid particles or water, and the middle layer represents the main components. To comprehensively assess the quality of the entire batch of liquid foods, testing standards generally require sampling liquids at different depths within the container and then mixing them for testing to obtain a representative average sample.

[0003] In existing technologies, stratified sampling of liquid foods typically employs multiple independent sampling methods. Operators first use a sterile sampling tube or syringe to insert into the upper layer of the container to draw a sample. Then, after replacing the sampling instrument or cleaning and sterilizing it, they insert it into the middle layer to draw a sample, and finally collect a sample from the lower layer in the same manner. This layer-by-layer, multiple-sampling process has significant shortcomings. Each sampling requires repeated insertion and removal of the instrument, making the operation cumbersome and time-consuming. Furthermore, each insertion and removal of the sampling instrument exposes it to the external environment, meaning the sample comes into contact with the external environment multiple times, and the risk of bacterial contamination accumulates with the number of operations.

[0004] Furthermore, while some adjustable-depth single-lumen sampling tubes on the market can collect liquids at different depths through a single insertion and multiple aspirations, these devices still require multiple opening and closing and aspiration actions during sampling. Moreover, the depth position needs to be readjusted each time, making it difficult to ensure a consistent sample volume across all layers. Even slight operator error can cause deviations in the sample volume across layers, thus affecting the representativeness of the mixed test results.

[0005] Therefore, existing liquid food stratification sampling technologies generally suffer from technical problems such as cumbersome operation procedures, low sampling efficiency, and high risk of bacterial contamination. To address these issues, a food aseptic sampling device is proposed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a food aseptic sampling device to solve the problems in the background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a food aseptic sampling device, comprising two end tubes and one middle tube. The two end tubes are respectively installed at both ends of the middle tube to form a sampling tube. Liquid inlet holes communicating with the interiors of the opposite ends of the two end tubes and the middle part of the middle tube are provided. Adjusting blocking rings are rotatably connected to the inner walls of the opposite ends of the two end tubes and the inner walls of the middle part of the middle tube. The adjusting blocking rings are provided with clearance openings corresponding to the liquid inlet holes. First connecting rods are fixedly connected to adjacent sides of the adjusting blocking rings in the two end tubes. A second connecting rod is passed through and fixedly connected to the middle part of the adjusting blocking ring in the middle tube. The two ends of the second connecting rod are respectively connected to the two first connecting rods. A rotating rod is fixedly connected to the upper end of the adjusting blocking ring located in the upper end tube. The upper end of the rotating rod passes through to the outside of the end tube and is laterally bent to form a handle.

[0008] Preferably, a fitting sleeve is installed on the top of the upper end tube, the fitting sleeve is fitted on the outer wall of the rotating rod, the rotating rod rotates inside the fitting sleeve, and a handle is fixedly installed on the upper outer wall of the fitting sleeve.

[0009] Preferably, the upper end of the upper end tube is provided with a liquid extraction hole, and a sealing block is fixedly connected to the bottom surface of the lower end of the fitting sleeve. The sealing block and the fitting sleeve slide on the outer wall of the rotating rod, and the sealing block is used to seal or open the liquid extraction hole. The top surface of the end tube is provided with multiple insertion holes, and the bottom surface of the fitting sleeve is fixedly connected with multiple insertion rods corresponding to the insertion holes.

[0010] Preferably, a baffle is installed on the outer wall of the rotating rod, and a compression spring is installed on the top of the mating sleeve. The compression spring is sleeved on the outer wall of the rotating rod and abuts against the end face of the baffle and the mating sleeve.

[0011] Preferably, a reduced diameter section is formed on the outer wall of the end tube near the middle tube, and connecting pipes are fixedly installed at both ends of the middle tube. The two connecting pipes are respectively sleeved on the outer wall of the reduced diameter section at the ends of the two end tubes. A limiting groove is formed at the end of the first connecting rod away from the adjusting blocking ring, and a limiting slide rod is fixedly connected to both ends of the second connecting rod. The limiting slide rod slides in the limiting groove. A limiting groove is formed on the outer wall of the reduced diameter section, and a protrusion is provided on the inner wall of the connecting pipe that slides in the limiting groove.

[0012] Preferably, the outer wall of the reduced diameter section has multiple sets of bayonets, and the inner wall of the connecting pipe has multiple mounting holes. An outward push spring and a retaining ball are installed in the mounting holes, and the two ends of the outward push spring abut against the bottom wall of the mounting hole and the outer wall of the retaining ball, respectively.

[0013] Preferably, a partition block is fixedly installed on the inner wall of the end tube near the middle tube and on the inner walls of both ends of the middle tube. A mixing hole is opened in the middle of the partition block. A multi-threaded column is sleeved and fixedly installed on the outer wall of the end of the first connecting rod away from the adjusting blocking ring and on the outer walls of both ends of the second connecting rod. Multiple sliding blocking grooves are opened on the inner wall of the end tube near the partition block and on the inner walls of both ends of the middle tube. A sealing block is movably inserted into the mixing hole. Multiple blocking strips are fixedly connected to the outer wall of one end of the sealing block. The blocking strips are slidably connected in the corresponding sliding blocking grooves. The multi-threaded column passes through the sealing block and is threadedly engaged with it. The threads on two adjacent multi-threaded columns have opposite directions of rotation.

[0014] Preferably, a sleeve is fixedly installed on the top of the sleeve, and the sleeve is sleeved on the outside of the compression spring, the rotating rod and the baffle. An arc-shaped positioning groove is opened on the upper surface of the sleeve, and an unlocking groove is opened on the bottom surface of one end of the arc-shaped positioning groove. A positioning rod is fixedly connected to the outer wall of the rotating rod. The positioning rod slides in the arc-shaped positioning groove and the unlocking groove. When the positioning rod rotates with the rotating rod to one end of the arc-shaped positioning groove, it forms an axial limit on the sleeve. When the positioning rod rotates to the unlocking groove position, it releases the axial limit on the sleeve.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses two end tubes and one middle tube to form a sampling tube with three independent chambers, and opens liquid inlet holes at corresponding positions in each chamber. With the help of a linkage rod, the liquid inlet holes are opened and closed synchronously. Only one insertion is needed to simultaneously complete the sampling of the lower, middle and upper layers of liquid food, eliminating the need for repeated insertion and removal operations, shortening the sampling time and improving the sampling efficiency in sample testing scenarios.

[0016] 2. The present invention uses a design of three independent chambers with equal volumes, so that each chamber can independently store the corresponding layer of liquid sample during a single sampling process. The samples of each layer do not come into contact with each other during the sampling stage, ensuring that the sample volume of each layer is consistent and determined by the chamber volume. This avoids the problem of uneven sample volume of each layer caused by multiple aspiration operations in the prior art, and ensures the representativeness of each layer of sample when mixed for detection.

[0017] 3. This invention adopts a linkage rod structure that runs through each chamber. The synchronous action of three adjusting blocking rings can be controlled simultaneously by rotating a single rod, so that all liquid inlets can be opened or closed at the same time. The operator only needs to rotate the rod to switch between opening and closing the liquid inlets and between isolating and connecting the chambers. The operation is simple and reduces the possibility of human error.

[0018] 4. This invention, through the telescopic fit between the end tube and the middle tube, and the sliding fit between the limiting slide rod and the limiting groove, allows the total length of the sampling tube to be freely adjusted according to liquid containers of different depths. It ensures that after telescopic adjustment, all inlet holes maintain the same axial direction, and all adjusting blocking rings can still move synchronously. It is suitable for liquid storage containers of different specifications, exhibiting good versatility and adaptability. Furthermore, the connecting tube and the reduced-diameter section, as well as the limiting slide rod and the limiting groove, are all separable. After sampling, the two end tubes and the middle tube can be completely disassembled for thorough cleaning and sterilization of each component, avoiding cross-contamination between different batches of samples and ensuring the accuracy of the test results.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the end tube and middle tube of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the sealing structure between the end tube and the middle tube of the present invention; Figure 5 for Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a cross-sectional structural diagram of the upper end tube, sleeve, and mating sleeve of the present invention; Figure 7 for Figure 6 A magnified view of a section at point C; Figure 8 for Figure 6 A magnified view of a section at point D; Figure 9 This is a schematic diagram of the mating structure of the sleeve and the positioning rod of the present invention; Figure 10 This is a schematic diagram of the connection structure between the connecting pipe and the end pipe of the present invention; Figure 11 This is a schematic diagram showing the connection relationship between the limiting slide rod, the first connecting rod, and the second connecting rod of the present invention.

[0021] In the diagram: 1. End tube; 2. Middle tube; 3. Liquid inlet; 4. Adjusting blocking ring; 5. Clearance port; 6. First connecting rod; 7. Second connecting rod; 8. Rotating rod; 9. Fitting sleeve; 10. Liquid outlet; 11. Sealing block; 12. Insertion hole; 13. Insertion rod; 14. Baffle; 15. Downward pressure spring; 16. Sleeve; 17. Arc-shaped positioning groove; 18. Unlocking groove; 19. Positioning rod; 20. Grip rod; 21. Reduced diameter section; 22. Limiting slide groove; 23. Limiting slide rod; 24. Bayonet; 25. Mounting hole; 26. Push spring; 27. Ball retainer; 28. Connecting tube; 29. ​​Limiting groove; 30. Separator block; 31. Mixing hole; 32. Sealing block; 33. Sliding blocking groove; 34. Blocking strip; 35. Multi-threaded column. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-10 The present invention discloses a food aseptic sampling device, the core structure of which includes two end tubes 1 and one middle tube 2. The two end tubes 1 are respectively installed at both ends of the middle tube 2, and the three together form a complete sampling tube. Of the two end tubes 1, one is the upper end tube, used to collect the upper layer sample of liquid food, and the other is the lower end tube, used to collect the lower layer sample of liquid food; the middle tube 2 is located between the two end tubes 1 and is used to collect the middle layer sample of liquid food.

[0024] Each of the two end tubes 1 (i.e., the top of the upper tube and the bottom of the lower tube) and the middle of the middle tube 2 has an inlet hole 3 communicating with its interior. The three inlet holes 3 correspond to the upper, middle and lower sampling positions, respectively. The inner walls of the opposite ends of the two end tubes 1 and the inner wall of the middle of the middle tube 2 are rotatably connected to an adjusting blocking ring 4. The outer wall of the adjusting blocking ring 4 is provided with a rubber layer for sealing the inlet hole 3 to ensure a sealing effect. Each adjusting blocking ring 4 has a clearance opening 5 corresponding to the position of the corresponding inlet hole 3. By rotating the adjusting blocking ring 4, the clearance opening 5 can be aligned or misaligned with the inlet hole 3, thereby opening or closing the inlet hole 3.

[0025] A first connecting rod 6 is fixedly connected to one side of each of the two adjusting blocking rings 4 inside the two end tubes 1 (i.e., the lower side of the adjusting blocking ring 4 in the upper end tube and the upper side of the adjusting blocking ring 4 in the lower end tube). A second connecting rod 7 is inserted through the middle of the adjusting blocking ring 4 inside the middle tube 2, and the second connecting rod 7 is fixedly connected to the adjusting blocking ring 4 inside the middle tube 2. The two ends of the second connecting rod 7 are respectively connected to the two first connecting rods 6, thereby realizing the linkage of the three adjusting blocking rings 4. A rotating rod 8 is fixedly connected to the upper end of the adjusting blocking ring 4 inside the upper end tube 1. The upper end of the rotating rod 8 extends to the outside of the upper end tube 1 and is bent laterally to form a handle, which is convenient for the operator to apply force to rotate.

[0026] Its working principle is as follows: When sampling liquid food is required, firstly, rotate the rotating rod 8 to misalign the clearance ports 5 on each adjusting blocking ring 4 with the corresponding liquid inlet 3. At this time, the liquid inlet 3 is completely blocked by the rubber layer on the outer wall of the adjusting blocking ring 4. Then, the sampling tube composed of the end tube 1 and the middle tube 2 is vertically inserted into the liquid food. Since the liquid inlet 3 has been blocked, the liquid will not enter the tube during the insertion process. When the sampling tube is inserted to the predetermined depth (i.e., the liquid inlet 3 of the lower end tube is located in the lower layer of liquid, the liquid inlet 3 of the middle tube 2 is located in the middle layer of liquid, and the liquid inlet 3 of the upper end tube is located in the upper layer of liquid), rotate the rotating rod 8 in the opposite direction. Through the linkage of the first connecting rod 6 and the second connecting rod 7, the three adjusting blocking rings 4 are driven to rotate synchronously until each clearance port 5 is aligned with the corresponding liquid inlet 3. At this time, the liquid in the lower, middle and upper layers enter the sampling tube through the corresponding liquid inlet 3, realizing one-time synchronous layered sampling. After sampling is completed, rotate the rotating rod 8 again to misalign and seal the clearance port 5 with the liquid inlet 3, and then the sampling tube can be removed. The overall structure is simple and can simultaneously collect liquid from the lower, middle and upper layers without the need for multiple samplings, thus improving material efficiency and reducing the possibility of bacterial contamination.

[0027] As a further improvement, a fitting sleeve 9 is installed on the top of the upper end tube 1. The fitting sleeve 9 is fitted onto the outer wall of the rotating rod 8 and can slide up and down relative to the rotating rod 8. A handle 20 is fixedly installed on the upper outer wall of the fitting sleeve 9. When the operator needs to rotate the rotating rod 8, he / she can hold the handle 20 to fix the sampling tube, which makes it easier to apply force to rotate the rotating rod 8.

[0028] As a further improvement, to facilitate the collection of liquid sampled from the sampling tube: a liquid collection hole 10 is provided at the upper end of the upper end of the end tube 1 for discharging the sample liquid from the sampling tube. A sealing block 11 is fixedly connected to the bottom surface of the lower end of the fitting sleeve 9. The sealing block 11 is slidably fitted on the outer wall of the rotating rod 8 and is correspondingly set with the liquid collection hole 10 for sealing or opening the liquid collection hole 10. Specifically, the fitting sleeve 9 can slide up and down on the outer wall of the rotating rod 8. When the fitting sleeve 9 is in the lower limit position, the sealing block 11 is embedded in the liquid collection hole 10 to seal it; when the fitting sleeve 9 is lifted, the sealing block 11 separates from the liquid collection hole 10, the liquid collection hole 10 opens, and the liquid sample in the sampling tube can be poured out and collected from the liquid collection hole 10. Furthermore, both the sampling hole 10 and the sealing block 11 have trapezoidal cross-sections, and the outer wall of the sealing block 11 is provided with a layer of sealing rubber to improve the sealing effect during sealing. In addition, the top surface of the upper end tube 1 is provided with multiple insertion holes 12, and multiple insertion rods 13 corresponding to the insertion holes 12 are fixedly connected to the bottom surface of the sleeve 9. When the insertion rod 13 is inserted into the insertion hole 12, the sleeve 9 cannot rotate relative to the end tube 1, so when rotating the rotating rod 8, the operator can stabilize the sampling tube by holding the handle 20, which facilitates the application of force.

[0029] As a further improvement, to prevent liquid from spilling out of the sampling hole 10 after sampling, causing contamination and waste, a baffle 14 is installed on the outer wall of the rotating rod 8, and a downward pressure spring 15 is installed on the top of the mating sleeve 9. The downward pressure spring 15 is sleeved on the outer wall of the rotating rod 8 and abuts against the end face of the baffle 14 and the mating sleeve 9. Since the rotating rod 8 can only rotate and cannot move axially, the downward pressure spring 15 always applies a downward elastic force to the mating sleeve 9, so that the sealing block 11 remains in a blocking state on the sampling hole 10 when no external force is applied, effectively preventing accidental leakage of liquid samples during the handling of the sampling tube. At the same time, the depth of the insertion hole 12 and the length of the insertion rod 13 are both set to be greater than the sliding stroke range of the mating sleeve 9, so that the mating sleeve 9 can only slide up and down and cannot rotate, making it convenient for the mating sleeve 9 to act as a force fulcrum when the rotating rod 8 rotates. The baffle 14 is rotatably connected to the outer wall of the rotating rod 8 to prevent the downward pressure spring 15 from twisting synchronously when the rotating rod 8 rotates, thus avoiding additional damping. A sleeve 16 is also fixedly installed on the top of the sleeve 9. The sleeve 16 is sleeved on the outside of the compression spring 15, the rotating rod 8 and the baffle 14 to provide protection for the compression spring 15 and prevent the operator from being pinched by the compression spring 15.

[0030] As a further improvement, to accommodate liquids of varying depths, a telescopic connection structure is adopted between the two end tubes 1 and the middle tube 2. Specifically, a reduced-diameter section 21 is provided on the outer wall of one end of the two end tubes 1 (i.e., the end closer to the middle tube 2), and connecting tubes 28 are fixedly installed at both ends of the middle tube 2. The two connecting tubes 28 are respectively fitted onto the outer wall of the reduced-diameter section 21 at the ends of the two end tubes 1. Through this structure, the end tubes 1 and the middle tube 2 can slide relative to each other to move away from or closer to each other, thereby changing the overall length of the sampling tube to accommodate liquid containers of different depths and ensuring that the liquid inlet 3 in the middle of the middle tube 2 is always located in the middle layer of the liquid, ensuring sampling accuracy. At the same time, a limiting groove 22 is provided at the end of the first connecting rod 6 away from the adjusting blocking ring 4. This limiting groove 22 is an irregular groove structure (such as a waist-shaped groove, a rectangular groove, or other non-circular groove; the attached figure is only an example for illustration). Both ends of the second connecting rod 7 are fixedly connected to limiting slide rods 23, which slide within the limiting groove 22. When the end tube 1 and the middle tube 2 extend or retract relative to each other, the limiting slide rod 23 slides within the limiting slide groove 22 to adapt to the length change. When the rotating rod 8 rotates, the irregular fit between the limiting slide rod 23 and the limiting slide groove 22 enables the first connecting rod 6 and the second connecting rod 7 to rotate synchronously, ensuring that each adjusting blocking ring 4 can be linked through the rotating rod 8 under any length adjustment state. Furthermore, the outer wall of the reduced diameter section 21 is also provided with a limiting groove 29, and the inner wall of the connecting pipe 28 at the end of the middle tube 2 is provided with a protrusion that slides with the limiting groove 29. The limiting groove 29 is used to circumferentially limit the connecting pipe 28, so that the middle tube 2 and the end tube 1 can only slide relative to each other axially and cannot rotate relative to each other, ensuring that each liquid inlet 3 is always in the same axial direction, thereby ensuring that the corresponding liquid inlet 3 can be accurately blocked or opened when each adjusting blocking ring 4 rotates synchronously.

[0031] As a further improvement, multiple sets of bayonets 24 are provided on the outer wall of the reduced diameter section 21, with each bayonet 24 spaced apart along the axial direction of the reduced diameter section 21. Multiple mounting holes 25 are provided on the inner wall of the connecting pipe 28. Each mounting hole 25 houses an outward-pushing spring 26 and a retaining ball 27. The two ends of the outward-pushing spring 26 abut against the bottom wall of the mounting hole 25 and the outer wall of the retaining ball 27, respectively, constantly applying an outward-pushing force to the retaining ball 27. When the end pipe 1 and the middle pipe 2 slide relative to each other to a certain position, aligning the bayonet 24 with the mounting hole 25, the retaining ball 27, under the pushing force of the outward-pushing spring 26, partially moves out of the mounting hole 25 and engages with the corresponding bayonet 24. This elastically positions the end pipe 1 and the middle pipe 2, ensuring the sampling pipe remains stable after length adjustment, facilitating sampling operations.

[0032] As a further improvement, to ensure the accuracy of stratified sampling and detection, a separator block 30 is fixedly installed on the inner wall of the end tube 1 near the middle tube 2 and on the inner walls of both ends of the middle tube 2. A mixing hole 31 is opened in the middle of each separator block 30. A multi-threaded post 35 is sleeved and fixedly installed on the outer wall of the end of the first connecting rod 6 away from the adjusting blocking ring 4 and on the outer walls of both ends of the second connecting rod 7. Multiple sliding blocking grooves 33 are opened on the inner wall of the end tube 1 near the separator block 30 and on the inner walls of both ends of the middle tube 2. A sealing block 32 is movably inserted into the mixing hole 31. Multiple blocking strips 34 are fixedly connected to the outer wall of one end of the sealing block 32. Each blocking strip 34 is slidably connected in the corresponding sliding blocking groove 33. The cooperation between the blocking strip 34 and the sliding blocking groove 33 forms a circumferential limit on the sealing block 32, so that the sealing block 32 can only slide axially and cannot rotate. The multi-threaded post 35 passes through the sealing block 32 and is threadedly engaged with it, and the threads on two adjacent multi-threaded posts 35 have opposite directions of rotation.

[0033] The working process is as follows: When the relief port 5 on the adjusting blocking ring 4 corresponds to the liquid inlet 3 (i.e., liquid inlet state), the sealing block 32 fits against the inner wall of the mixing hole 31 of the separator block 30, sealing the mixing hole 31. At this time, each separator block 30 divides the inner cavity of the end tube 1 and the middle tube 2 into three independent chambers, storing the liquid samples of the lower, middle and upper layers respectively, ensuring that the samples of each layer do not mix during the sampling process. After sampling is completed, the rotating rod 8 drives the first connecting rod 6 and the second connecting rod 7 to rotate synchronously, thereby driving each multi-threaded column 35 to rotate. The multi-threaded column 35 drives the sealing block 32 to move axially, causing it to disengage from the mixing hole 31. Since the threads of adjacent multi-threaded columns 35 are opposite, the two adjacent sealing blocks 32 in the end tube 1 and the middle tube 2 move in opposite directions and move away from each other, thereby opening each mixing hole 31. At this point, the lower, middle, and upper liquid samples are connected and mixed through the mixing holes 31 to form a uniform mixed sample. The liquid collection hole 10 can then be opened by lifting the upper fitting sleeve 9 to discharge and collect the mixed sample for testing. Furthermore, both the mixing hole 31 and the sealing block 32 have trapezoidal cross-sections, and the outer wall of the sealing block 32 is provided with a layer of sealing rubber to improve the sealing effect when blocking the mixing hole 31.

[0034] It should be noted that when the liquid inlet 3 needs to be closed, the rotatable angle of the rotating rod 8 is less than 360°. However, the multi-threaded column 35 can drive the sealing block 32 to obtain a large axial stroke within a limited angle, so that it can fully open the mixing hole 31 and ensure that the liquids of each layer are mixed smoothly.

[0035] As a preferred operating method, to ensure no air residue in each chamber and the sterility of the sampling process, the device can undergo a negative pressure pretreatment under sterile conditions before use. Specifically: First, connect an external air extraction device (such as a sterile syringe or a manual vacuum pump) through the liquid inlet 3 to extract the air from the end tube 1 and the middle tube 2 and create negative pressure. Then, rotate the rotating rod 8 to misalign the clearance port 5 with the liquid inlet 3, sealing the negative pressure in each independent chamber. Next, insert the sampling tube into the liquid. After it is in place, rotate the rotating rod 8 in the opposite direction to open the liquid inlet 3. The liquid is then drawn into each chamber under atmospheric pressure, achieving complete filling of each chamber and equal-volume sampling. During the air extraction process, the original air in the chamber is extracted unidirectionally and discharged to the outside, avoiding the presence of bacteria-containing air in the sample and further ensuring the sterility of the sampling process.

[0036] As a further improvement, an arc-shaped positioning groove 17 is formed on the upper surface of the sleeve 16, and an unlocking groove 18 is formed on the bottom surface of one end of the arc-shaped positioning groove 17, which is perpendicularly connected to it. A positioning rod 19 is fixedly connected to the outer wall of the rotating rod 8, and the positioning rod 19 is slidably fitted in the arc-shaped positioning groove 17 and the unlocking groove 18. The arc length of the arc-shaped positioning groove 17 is adapted to the corresponding positions of the relief port 5 and the liquid inlet 3. Specifically, when the relief port 5 is rotated to be aligned with the liquid inlet 3 (i.e., in the liquid inlet state), the positioning rod 19 rotates with the rotating rod 8 to one end of the arc-shaped positioning groove 17. At this time, the positioning rod 19 leaves the position of the unlocking groove 18, and its two ends are respectively supported on the end faces of the sleeve 16 on both sides of the arc-shaped positioning groove 17, forming an axial limit on the sleeve 16, so that the mating sleeve 9 cannot move upward, and the sealing block 11 remains closed to the liquid sampling hole 10, further ensuring that the liquid sample in the sampling tube does not leak out. When it is necessary to close the inlet hole 3 and open the mixing hole 31 for drainage, rotate the rotating rod 8 to move the positioning rod 19 to the inner wall of the other end of the arc-shaped positioning groove 17. At this time, the clearance port 5 is misaligned with the inlet hole 3 (the inlet hole 3 is closed), and the mixing hole 31 is opened, with the positioning rod 19 positioned directly above the unlocking groove 18. At this time, the operator can pull up the mating sleeve 9, and the unlocking groove 18 is fitted onto the outer wall of the positioning rod 19. The mating sleeve 9 drives the sealing block 11 to move upward, thereby opening the liquid extraction hole 10 for the recovery and testing of the mixed sample.

[0037] In summary, the rotating rod 8 has three working positions: In the first position, the clearance port 5 is aligned with the liquid inlet hole 3, the mixing hole 31 is closed, and the liquid outlet hole 10 is closed, indicating the liquid inlet state; in the second position, the clearance port 5 is misaligned with the liquid inlet hole 3, the mixing hole 31 is open, and the liquid outlet hole 10 is closed, indicating the mixing state; in the third position, the liquid outlet hole 10 opens after the fitting sleeve 9 is lifted, indicating the liquid outlet state. These three positions are switched by the rotation angle of the rotating rod 8 and the lifting action of the fitting sleeve 9.

[0038] As a further improvement, to avoid cross-contamination between different batches of samples and ensure the accuracy of test results, this device can be disassembled and cleaned after use. Specifically, the connecting tube 28 and the reduced diameter section 21 are separable sliding fits, and the limiting slide rod 23 and the limiting slide groove 22 are separable sliding fits. By sliding the connecting tube 28 axially out of the reduced diameter section 21 and pulling the limiting slide rod 23 out of the limiting slide groove 22, the two end tubes 1 and the middle tube 2 can be completely disassembled, and each component can be cleaned and sterilized separately for the next sampling operation.

Claims

1. A food aseptic sampling device, characterized in that, It includes two end tubes (1) and one middle tube (2). The two end tubes (1) are respectively installed at both ends of the middle tube (2) to form a sampling tube. The opposite ends of the two end tubes (1) and the middle part of the middle tube (2) are provided with inlet holes (3) that communicate with their interiors. The inner walls of the opposite ends of the two end tubes (1) and the inner walls of the middle part of the middle tube (2) are rotatably connected with adjusting blocking rings (4). The adjusting blocking rings (4) are provided with relief openings (5) corresponding to the inlet holes (3). The adjusting blocking ring (4) inside the root end tube (1) is fixedly connected to the first connecting rod (6) on both sides. The adjusting blocking ring (4) inside the middle tube (2) is connected to the second connecting rod (7) through the middle. The two ends of the second connecting rod (7) are respectively connected to the two first connecting rods (6). The upper end of the adjusting blocking ring (4) inside the upper end tube (1) is fixedly connected to the rotating rod (8). The upper end of the rotating rod (8) passes through the outside of the end tube (1) and bends laterally to form a handle.

2. The food aseptic sampling device according to claim 1, characterized in that, A fitting sleeve (9) is installed on the top of the end tube (1) located at the upper end. The fitting sleeve (9) is fitted on the outer wall of the rotating rod (8). The rotating rod (8) rotates inside the fitting sleeve (9). A handle (20) is fixedly installed on the upper outer wall of the fitting sleeve (9).

3. The food aseptic sampling device according to claim 2, characterized in that, The upper end of the end tube (1) is provided with a liquid extraction hole (10). A sealing block (11) is fixedly connected to the bottom surface of the lower end of the fitting sleeve (9). The sealing block (11) and the fitting sleeve (9) slide on the outer wall of the rotating rod (8). The sealing block (11) is used to seal or open the liquid extraction hole (10). The top surface of the end tube (1) is provided with multiple insertion holes (12). The bottom surface of the fitting sleeve (9) is fixedly connected with multiple insertion rods (13) corresponding to the insertion holes (12).

4. The food aseptic sampling device according to claim 3, characterized in that, A baffle (14) is installed on the outer wall of the rotating rod (8), and a compression spring (15) is installed on the top of the mating sleeve (9). The compression spring (15) is sleeved on the outer wall of the rotating rod (8) and abuts against the end face of the baffle (14) and the mating sleeve (9).

5. The food aseptic sampling device according to claim 1, characterized in that, A reduced diameter section (21) is provided on the outer wall of the end of the end tube (1) near the middle tube (2). Both ends of the middle tube (2) are fixedly installed with connecting tubes (28). The two connecting tubes (28) are respectively sleeved on the outer wall of the reduced diameter section (21) at the ends of the two end tubes (1). A limit groove (22) is provided at the end of the first connecting rod (6) away from the adjusting blocking ring (4). Both ends of the second connecting rod (7) are fixedly connected with limit sliding rods (23). The limit sliding rods (23) slide in the limit groove (22). A limit groove (29) is provided on the outer wall of the reduced diameter section (21). A protrusion that slides in the limit groove (29) is provided on the inner wall of the connecting tube (28).

6. The aseptic food sampling device according to claim 5, characterized in that, The outer wall of the reduced diameter section (21) has multiple sets of bayonets (24), and the inner wall of the connecting pipe (28) has multiple mounting holes (25). An external push spring (26) and a retaining ball (27) are installed in the mounting hole (25). The two ends of the external push spring (26) abut against the bottom wall of the mounting hole (25) and the outer wall of the retaining ball (27), respectively.

7. The aseptic food sampling device according to claim 1, characterized in that, A partition block (30) is fixedly installed on the inner wall of the end tube (1) near the middle tube (2) and on the inner walls of both ends of the middle tube (2). A mixing hole (31) is opened in the middle of the partition block (30). A multi-threaded column (35) is sleeved and fixedly installed on the outer wall of the first connecting rod (6) away from the adjusting blocking ring (4) and on the outer walls of both ends of the second connecting rod (7). A multi-sliding blocking groove (33) is opened on the inner wall of the end tube (1) near the partition block (30) and on the inner walls of both ends of the middle tube (2). A sealing block (32) is movably inserted into the mixing hole (31). A multi-blocking strip (34) is fixedly connected to the outer wall of one end of the sealing block (32). The blocking strip (34) is slidably connected in the corresponding sliding blocking groove (33). The multi-threaded column (35) passes through the sealing block (32) and is threadedly engaged with it. The threads on two adjacent multi-threaded columns (35) have opposite directions.

8. The food aseptic sampling device according to claim 4, characterized in that, A sleeve (16) is fixedly installed on the top of the sleeve (9). The sleeve (16) is sleeved on the outside of the compression spring (15), the rotating rod (8) and the baffle (14). An arc-shaped positioning groove (17) is opened on the upper surface of the sleeve (16). An unlocking groove (18) is opened on the bottom surface of one end of the arc-shaped positioning groove (17). A positioning rod (19) is fixedly connected to the outer wall of the rotating rod (8). The positioning rod (19) slides in the arc-shaped positioning groove (17) and the unlocking groove (18). When the positioning rod (19) rotates with the rotating rod (8) to one end of the arc-shaped positioning groove (17), it forms an axial limit on the sleeve (16). When the positioning rod (19) rotates to the position of the unlocking groove (18), it releases the axial limit on the sleeve (16).

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