Sampling equipment for detecting aflatoxin in thick broad-bean sauce

Abstract

The invention discloses sampling equipment for detecting aflatoxin in thick broad-bean sauce, and relates to the technical field of food detection equipment. The equipment comprises a rotary table arranged above a transmission mechanism, a sauce dipping rod mounting mechanism, a test paper belt conveying mechanism and a sauce dipping rod dismounting mechanism, wherein four sauce dipping rod fixing mechanisms are arranged on the rotary table in the circumferential direction. During working, the sauce dipping rod mounting mechanism automatically mounts a sauce dipping rod on the fixing mechanism at a mounting station; the rotating disc rotates to drive the sauce dipping rods to sequentially move to a dipping station to dip the thick broad-bean sauce in the packaging bottle, and then the sauce dipping rods move to a detection station to automatically smear the thick broad-bean sauce on the test paper tape; and finally, the sauce dipping bar dismounting mechanism automatically removes the used sauce dipping bars at the dismounting station. According to the invention, the full-process automation from sampling to smearing is realized, the manual operation is effectively replaced, and the device has the remarkable advantages of high working efficiency and good sampling consistency.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of food detection equipment, and in particular to a sampling device for detecting aflatoxin in bean paste. BACKGROUND

[0002] As a traditional fermented condiment in China, the production scale of bean paste is expanding, and the automation level is continuously improving. However, during the fermentation and subsequent storage process, if the environmental parameters such as temperature and humidity are not properly controlled, the bean paste is easily contaminated by harmful molds such as Aspergillus flavus. The aflatoxin produced by Aspergillus flavus is a strong carcinogen, and its toxicity is severe, which poses a serious threat to consumer health. Therefore, before the bean paste is sealed in the packaging bottle, it is necessary to quickly and effectively screen the aflatoxin in the bean paste in the packaging bottle, which is an indispensable key link to ensure food safety.

[0003] Currently, there are mainly two technical paths for detecting aflatoxin in bean paste: Laboratory precision detection methods: such as high-performance liquid chromatography, mass spectrometry, etc. This kind of method has high detection precision and accurate results, but has the following insurmountable shortcomings: expensive equipment, need for professional technicians to operate, complex sample pretreatment, and detection period of several hours or even several days. This determines that it can only be used for offline sampling inspection, and cannot be used for screening of bean paste in each packaging bottle, which has the risk of missing detection.

[0004] On-site rapid detection method: the immunochromatography method represented by the gold standard test paper method is the current mainstream on-site screening method. Based on the principle of specific binding of antigen and antibody, this method has the advantages of fast speed, simple operation and relatively low cost. However, in the current industrial production scene, even this rapid detection method, its "sampling" and "sample loading" steps almost completely rely on manual operation. Specifically, the operator needs to hold a dipping stick to dip the bean paste sample from the packaging bottle on the assembly line, and then evenly smear it on the test paper strip. This manual operation mode brings many serious challenges: Efficiency bottleneck: the speed of manual operation is limited, and it is difficult to match the rhythm of high-speed automatic production line, which becomes the bottleneck of overall production efficiency.

[0005] High labor intensity and human error: repetitive and monotonous operations can easily cause worker fatigue, leading to human errors such as missed detection and false detection, introducing uncertainty in quality control.

[0006] Health and safety risks: frequent manual contact with samples increases the risk of secondary contamination of products. SUMMARY

[0007] The sampling device for detecting aflatoxin in bean paste sauce provided by the present application adopts a full-automatic sampling mode, is high in efficiency, and solves the problems of low efficiency and high labor intensity caused by manual operation.

[0008] The present application mainly achieves the above-mentioned purposes through the following technical solutions. The sampling device for detecting aflatoxin in bean paste sauce comprises a dip stick mounting mechanism, a dip stick dismounting mechanism, a test strip belt conveying mechanism, a rotating disc, and a first driving mechanism for driving the rotating disc to rotate, which are arranged above a conveying mechanism for conveying the packaging bottles of the bean paste sauce. The dip stick mounting mechanism is used for mounting a dip stick on the dip stick fixing mechanism when the dip stick fixing mechanism is displaced to the region between the dip stick mounting mechanism and the rotating disc.

[0009] The dip stick mounting mechanism corresponds to the mounting station, the dip stick dismounting mechanism corresponds to the dismounting station, the test strip belt conveying mechanism corresponds to the detection station, and the region directly below the rotating disc corresponds to the dipping station.

[0010] Further, the sampling device for detecting aflatoxin in bean paste sauce further comprises a support frame.

[0011] The support frame of the present application provides a stable mounting base for all functional components; the first driving mechanism (usually a servo motor or a stepper motor) provides accurate, indexed rotary power for the rotating disc. In this way, the present application not only ensures the structural rigidity and operational stability of the entire device, but also ensures that each dip stick fixing mechanism can be precisely stopped at each station, which is a prerequisite for all subsequent precise actions.

[0012] Further, the dip stick fixing mechanism includes a connecting rod, the dip stick fixing mechanism is fixedly connected with the rotating disc through one end of the connecting rod fixed on the surface of the rotating disc, a cavity coaxial with the connecting rod is arranged in the connecting rod, a movable block which can move along the axial direction of the cavity and is in sliding sealing cooperation with the cavity is arranged in the cavity, and a connecting hole coaxial with the cavity and in communication with the cavity is arranged at the end of the connecting rod away from the rotating disc; a first mounting blind hole for accommodating the end of the dip stick is arranged at the end of the movable block facing the connecting hole, a first groove is formed in the side wall of the first mounting blind hole, a first limiting block and a first elastic element driving the first limiting block to radially pop out are arranged in the first groove, and a first limiting blind hole matched with the first limiting block is arranged on the side wall of the dip stick; when the dip stick is installed on the dip stick fixing mechanism at the installation station, the first elastic element pushes the first limiting block to be embedded in the first limiting blind hole, and the first limiting block and the first limiting blind hole are in sliding sealing cooperation, and the dip stick and the first mounting blind hole are in sliding sealing cooperation; A second elastic element for providing the movable block with an elastic force towards the connecting hole is arranged above the movable block in the cavity of the connecting rod, a connecting column is arranged at the end of the movable block away from the connecting hole, the second elastic element is sleeved on the connecting column, and a second limiting blind hole is further arranged on the side wall of the connecting column; a second mounting blind hole opposite to the connecting column is formed in the inner wall of the cavity of the connecting rod by being recessed, a second groove is formed in the side wall of the second mounting blind hole by being recessed, a second limiting block and a third elastic element driving the second limiting block to radially pop out are arranged in the second groove; when the dip stick is installed on the dip stick fixing mechanism at the installation station, the third elastic element pushes the second limiting block to be embedded in the second limiting blind hole, and the second limiting block and the second limiting blind hole are in sliding sealing cooperation, and the connecting column and the second mounting blind hole are in sliding sealing cooperation; The sampling device is further provided with a trigger control mechanism for releasing the second limiting block from limiting the connecting column at the dipping station and releasing the first limiting block from limiting the dip stick at the dismounting station.

[0013] The movable block is locked in the retracted position by the second limiting block when the dip stick is installed, providing a stable base for pushing in the dip stick; after the dip stick is pushed in, it is locked by the first limiting block. When the invention reaches the dipping station, the trigger control mechanism releases the locking of the second limiting block, and the movable block is quickly extended under the push of the second elastic element, driving the dip stick to insert into the sauce cylinder. When the invention reaches the disassembly station, the trigger control mechanism releases the locking of the first limiting block, creating conditions for the dip stick disassembly mechanism to remove the dip stick. The invention defines the sliding seal fit between the dip stick and the first installation blind hole, the sliding seal fit between the second limiting block and the second limiting blind hole, and the sliding seal fit between the connecting column and the second installation blind hole, to ensure that the pneumatic control circuit can form an effective pressure, which is the prerequisite for the air pressure to drive the limiting block. The invention adopts the design of movable block and double limiting blocks to realize the "two-stage stroke" of the dip stick, which not only ensures the safety of transfer (retracted state), but also realizes fast and powerful sampling (extended state), which is the essence of efficient and reliable automatic sampling.

[0014] Further, the trigger control mechanism includes a guide disc, a pressing ball and a first air bag, the guide disc is fixed on the support frame and coaxially arranged with the rotating disc, the first air bag is fixed to the end of the connecting rod connected to the rotating disc, the pressing ball is arranged on the first air bag and located between the first air bag and the guide disc, the guide disc is provided with a first protruding part for pressing the pressing ball when the dip stick rotates to the dipping station, and a second protruding part for pressing the first air bag when the dip stick rotates to the disassembly station; The connecting rod is provided with a vertically arranged cylindrical accommodating cavity, the accommodating cavity is located above the cavity and coaxially arranged with the cavity; the connecting rod is provided with a first channel, a second channel and a third channel, the first channel communicates the accommodating cavity with the second installation blind hole, and the opening of the first channel at one end of the accommodating cavity is located at the top of the side wall of the accommodating cavity; the second channel communicates the accommodating cavity with the first air bag, and the opening of the second channel at one end of the accommodating cavity is located at the middle of the side wall of the accommodating cavity; the third channel communicates the cavity region above the movable block with the accommodating cavity, and the opening of the third channel at one end of the accommodating cavity is located at the bottom of the side wall of the accommodating cavity; a plugging ball matched with the inner diameter of the accommodating cavity is arranged in the accommodating cavity, and the diameter of the plugging ball is less than one half of the vertical height of the accommodating cavity; The connecting column is provided with a sixth channel connected to the second limiting blind hole, and the other end opening of the sixth channel relative to the second limiting blind hole is located at the top of the connecting column; The movable block is provided with a cavity region above the movable block and a fourth channel of the first mounting blind hole, the fourth channel is open at the other end of the cavity region, and the other end of the cavity region is located at the top of the first mounting blind hole; the dip stick is provided with a fifth channel, one end of the fifth channel is communicated with the first limiting blind hole, and the other end of the fifth channel is communicated with the fourth channel through the cavity between the top end of the dip stick and the movable block in the first mounting blind hole.

[0015] When the connecting rod is vertically downward at the dipping station, the blocking ball blocks the third channel at the bottom. The extrusion ball is extruded by the first protruding part, the air in the first air bag enters the second limiting blind hole through the second channel, the accommodating cavity, the first channel, the sixth channel, and pushes away the second limiting block. When the connecting rod is vertically upward at the disassembling station, the blocking ball blocks the first channel at the top. The extrusion ball is extruded by the second protruding part, the air in the first air bag enters the first limiting blind hole through the second channel, the accommodating cavity, the third channel, the fourth channel and the fifth channel, and pushes away the first limiting block. The rotation of the rotating disc is converted into a trigger signal by limiting the guide disc and the protruding part, and the trigger is pure mechanical, without electric control, reliable and low in cost. The air path is automatically switched by the limitation of the accommodating cavity and the blocking ball, and one air source (the first air bag) can perform two functions according to different stations. The design is very ingenious and simplifies the structure.

[0016] Further, the sampling end of the dip stick is provided with a dip head, the sampling end of the dip stick is provided with a third mounting blind hole, the inner wall of the third mounting blind hole is concave and provided with a third limiting blind hole, the side wall of the dip head is provided with a third groove, the third groove is provided with a fifth elastic element and a third limiting block, the dip head pushes the third limiting block into the third limiting blind hole through the fifth elastic element to realize connection with the dip stick; the third mounting blind hole is provided with a fourth elastic element connected to the top of the third mounting blind hole and the top of the dip head; The cavity of the connecting rod is also provided with a second air bag below the movable block, the connecting rod is provided with a seventh channel connecting the second air bag and the side wall of the connecting hole; the side wall of the dip stick is provided with an annular groove, and the dip stick is provided with an eighth channel connecting the annular groove and the third limiting blind hole; when the movable block moves downward under the action of the second elastic element, the movable block extrudes the second air bag to generate airflow, when the annular groove on the side wall of the dip stick moves to the seventh channel, the airflow enters the annular groove on the side wall of the dip stick through the seventh channel, and is transmitted to the third limiting blind hole through the eighth channel, so that the third limiting block is contracted and unlocked, and the dip head is retracted under the action of the fourth elastic element.

[0017] The dipper is dipped, the movable block is lowered to extrude the second air bag, air flow is generated to pass through the seventh channel, the annular groove and the eighth channel to be transmitted to push away the third limiting block, the sauce head is quickly retracted under the action of the fourth elastic member, and the sauce is pulled off.

[0018] Further, the sauce stick mounting mechanism comprises a feeding box and a second driving mechanism, the feeding box is connected with the support frame, a plurality of sauce sticks are arranged in the feeding box, the plurality of sauce sticks are stacked in the feeding box from bottom to top, a discharge port is arranged on the side wall of the feeding box facing the rotating disc, and the second driving mechanism is fixed on the side wall of the feeding box and the output shaft thereof penetrates into the feeding box.

[0019] The second driving mechanism is used for pushing out the lowermost sauce stick in the feeding box from the discharge port and inserting the lowermost sauce stick into the connecting hole of the sauce stick fixing mechanism.

[0020] Further, the sauce stick mounting mechanism comprises a feeding box and a second driving mechanism, the feeding box is connected with the support frame, a plurality of sauce sticks are arranged in the feeding box, the plurality of sauce sticks are stacked in the feeding box from bottom to top, a discharge port is arranged on the side wall of the feeding box facing the rotating disc, and the second driving mechanism is fixed on the side wall of the feeding box and the output shaft thereof penetrates into the feeding box. The other end of the discharging rod opposite to the fourth driving mechanism is provided with a fourth mounting blind hole, a sixth elastic member and an extruding rod with an outer diameter consistent with the inner diameter of the fourth mounting blind hole are arranged in the fourth mounting blind hole, a third air bag is arranged on the side wall of the discharging rod and surrounds the discharging rod, the third air bag is communicated with the fourth mounting blind hole through a gas pipe, and a one-way valve is arranged in the gas pipe to restrict the one-way flow of gas from the fourth mounting blind hole to the third air bag. An interface is arranged on the side wall of the sauce stick, and a limiting groove is arranged on the inner wall of the interface.

[0021] Further, a sampling device for detecting aflatoxin in bean paste sauce also comprises a collecting box connected with the support frame, and an opening is arranged on one side of the collecting box. A seventh elastic member and a vertical rod connected with the seventh elastic member are arranged on the top of the opening end of the collecting box. The blanking rod is further provided with a containing cavity, an eighth elastic member and a blocking block are arranged in the containing cavity, an exhaust port is arranged on the side wall of the blanking rod and communicated with the containing cavity, the eighth elastic member is used for pushing the blocking block to block the exhaust port, the air pipe is communicated with the containing cavity, and the one-way valve is arranged on the air pipe line between the containing cavity and the fourth mounting blind hole.

[0022] The third gas bag is inflated and clamped into the limiting groove by the horizontal insertion of the blanking rod into the dip stick interface, the retreat of the extrusion rod compresses air, the third driving mechanism is lifted, the fourth driving mechanism is horizontally moved, and the dip stick is sent into the collection box. Then, the vertical rod is inserted into the exhaust port to push open the blocking block, the third gas bag is depressurized and shrunk, and the blanking rod is separated from the dip stick. The third gas bag is used for grabbing, a flexible and self-adaptive grabbing mode is adopted, high-precision centering is not required, and the reliability is high. The vertical rod is used for triggering the exhaust limitation, the complete automation of the release action is realized, the collection action is perfectly connected in time sequence, and no additional control is required.

[0023] The dip stick mounting mechanism is used for automatically mounting the unused dip stick to the connecting rod of the turntable, then the connecting rod provided with the dip stick is rotated to the bean paste packaging bottle, the first gas bag and the second gas bag are used for smoothly dipping the to-be-detected bean paste, the turntable is used for rotating the dip stick provided with the dipped bean paste to the test paper tape conveying mechanism, the dipped bean paste is applied to the test paper, after the application of the bean paste is completed, the connecting rod is rotated to the dip stick dismounting mechanism under the action of the turntable, the dip stick dismounting mechanism is used for automatically dismounting the used dip stick from the connecting rod in cooperation with the first gas bag, and the new dip stick is mounted on the connecting rod, and the sampling on the remaining bean paste packaging bottles is continued.

[0024] Compared with the prior art, the present application has the following advantages: (1) In the specific implementation, the "installation-dipping-applying-dismounting" actions originally scattered and dependent on manpower are integrated into a continuous and automatic process through the rotation of the turntable. This completely liberates manpower from repetitive labor, improves the detection efficiency by several times, perfectly matches the rhythm of modern high-speed production lines, and solves the fundamental problem that manual operation becomes the bottleneck of production efficiency.

[0025] (2) The whole sampling and applying process is accurately completed by mechanical equipment according to the preset program, completely avoiding the problems of uneven sampling amount and different applying force caused by individual differences and fatigue in manual operation. This makes the detection conditions of each sample highly consistent, significantly improves the accuracy and comparability of the detection results, and provides a reliable basis for product quality control.

[0026] (3) The four function units of installation, dipping, detection and dismounting can be closely surrounded around the rotating disc, the device structure is very compact, the floor area is small, and integration and deployment in the existing production line are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings described herein are used to provide further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation to the embodiments of the present application. In the drawings: Figure 1 is a structural schematic view of the present application; Figure 2 is a structural schematic view of the sauce stick mounting mechanism of the present application; Figure 3 is a structural schematic view of the collecting box of the present application; Figure 4 is a structural schematic view of the present application Figure 3 is a structural schematic view of the A part of the present application; Figure 5 is a structural schematic view of the blanking rod of the present application; Figure 6 is a structural schematic view of the sauce stick fixing mechanism and the sauce stick when connected; Figure 7 is a structural schematic view of the connecting rod in another state of the present application; Figure 8 is a structural schematic view of the present application Figure 6 is a structural schematic view of the B part of the present application; Figure 9 is a structural schematic view of the C part of the present application; Figure 6 is a structural schematic view of the D part of the present application 6; Figure 10 is a structural schematic view of the movable block of the present application; Figure 11 is a structural schematic view of the test strip belt conveying mechanism of the present application; Figure 12 is a structural schematic view of the guide disc of the present application; Figure 13 is a structural schematic view of the sauce stick of the present application. Figure 14 Markings in the drawings and corresponding names of parts:

[0028] ​1. Conveying mechanism; 2. Dipping stick installation mechanism; 4. Dipping stick disassembly mechanism; 5. Dipping stick fixing mechanism; 6. Test strip conveying mechanism; 7. Dipping stick; 8. Turntable; 201. Second drive mechanism; 202. Feeding box; 203. Guide plate; 301. Collection box; 302. Seventh elastic element; 303. Vertical rod; 401. Third airbag; 402. Extrusion rod; 403. Sixth elastic element; 405. Eighth elastic element; 406. Feeding rod; 501. Extrusion ball; 502. First airbag; 503. Connecting rod; 504. Second elastic element 505. Connecting post; 508. First channel; 509. Sealing ball; 510. Second channel; 511. Third channel; 512. First mounting blind hole; 513. Second limiting block; 514. Second mounting blind hole; 515. Second airbag; 516. Movable block; 517. First limiting block; 518. Fourth channel; 521. First mounting blind hole; 601. Rotating roller; 602. Test strip; 7. Dipping stick; 701. Dipping head; 703. Annular groove; 704. Fourth elastic element; 705. Third limiting block; 706. Eighth channel. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0030] Example: like Figures 1 to 14 As shown, a sampling device for detecting aflatoxin in fermented soybean paste includes a dipping stick mounting mechanism 2, a dipping stick dismounting mechanism 4, a test strip conveying mechanism 6, a turntable 8, and a first driving mechanism for rotating the turntable 8, all located above a conveying mechanism 1 that transports fermented soybean paste packaging bottles. In this embodiment, the turntable 8 is vertically arranged, and four dipping stick fixing mechanisms 5 are evenly spaced along its circumference. The dipping stick mounting mechanism 2 and the test strip conveying mechanism 6 are located on both sides of the turntable 8, and the dipping stick dismounting mechanism 4 is located above the turntable 8. The test strip conveying mechanism 6 is used to transport the test strip 602. This embodiment also includes a dipping stick 7. The dipping stick mounting mechanism 2 is used to install a dipping stick 7 on any one of the dipping stick fixing mechanisms 5 when it moves to the area between the dipping stick mounting mechanism 2 and the turntable 8. In this embodiment, the rotation of the turntable 8 causes the dipping sticks 7 on the dipping stick fixing mechanism 5 to move sequentially to the dipping station to dip into the fermented bean paste in the packaging bottle, and then to the testing station to apply the fermented bean paste onto the test strip 602 on the test strip conveying mechanism 6. The dipping stick removal mechanism 4 in this embodiment is used to remove the applied dipping stick 7 from the dipping stick fixing mechanism 5 when any dipping stick fixing mechanism 5 moves to the area between the dipping stick removal mechanism 4 and the turntable 8.

[0031] In the prior art, when detecting Aspergillus flavus in the bean paste in a bean paste bottle, a worker generally adopts a sampling method, i.e. manually dips the bean paste to smear on a test paper to complete qualitative determination of aflatoxin in the sample by means of standard test paper sample colorimetry. This method can estimate the content of aflatoxin, but the manual sampling method is time-consuming and laborious. Therefore, the embodiment is provided with a turntable 8, a dip stick mounting mechanism 2, a test paper tape conveying mechanism 6 and a dip stick dismounting mechanism 4 on a conveying mechanism 1 for conveying bean paste bottles, the turntable 8 can rotate in a vertical plane, four dip stick fixing mechanisms 5 are arranged on the circular surface of the turntable 8, the dip stick fixing mechanisms 5 are uniformly distributed on the turntable 8, the dip stick mounting mechanism 2 and the test paper tape conveying mechanism 6 are arranged on the two sides of the turntable 8 respectively, and the dip stick dismounting mechanism 4 is arranged above the turntable 8. The dip stick mounting mechanism 2 is arranged to store dip sticks 7 for dipping the bean paste, and the dip sticks 7 stacked in the dip stick mounting mechanism 2 are sequentially connected to one of the dip stick fixing mechanisms 5 of the turntable 8. The test paper tape conveying mechanism 6 is arranged to automatically convey the test paper, so that the dip stick 7 on the corresponding dip stick fixing mechanism 5 of the turntable 8 can smear the bean paste on the test paper to achieve detection of Aspergillus flavus in the bean paste. The dip stick dismounting mechanism 4 is arranged to separate the dip stick 7 from the corresponding dip stick fixing mechanism 5.

[0032] Specifically, when one of the dip stick fixing mechanisms 5 on the turntable 8 rotates to face the dip stick mounting mechanism 2, the dip stick 7 is connected to the dip stick fixing mechanism 5 by means of the dip stick mounting mechanism. At this time, the bean paste bottle on the conveying mechanism 1 is conveyed to be directly below the turntable 8. The dip stick fixing mechanism 5 connected with the dip stick 7 is rotated to be above the bean paste bottle by counterclockwise rotation of the turntable 8, and dips the bean paste in the bottle. Then, the dip stick fixing mechanism 5 with the dip stick 7 dipped with the bean paste is rotated to contact the test paper tape 602 of the test paper tape conveying mechanism 6 by further counterclockwise rotation of the turntable 8, so as to achieve the purpose of smearing the bean paste on the test paper. Whether the bean paste in the bottle contains Aspergillus flavus is determined by the test paper. After the dip stick 7 is smeared on the test paper, the dip stick 7 is rotated to the dip stick dismounting mechanism 4 by further counterclockwise rotation of the turntable 8, and the dip stick 7 is separated from the dip stick fixing mechanism 5 by means of the dip stick dismounting mechanism 4. The dip stick fixing mechanism 5 can be reinstalled with a new dip stick 7 at the dip stick mounting mechanism 2 to continue to detect the bean paste in other bottles for mildew.

[0033] The test paper tape conveying mechanism 6 of the embodiment comprises at least two rotating rollers 601, and the test paper tape 602 is wound around the rotating rollers 601 in a loop. At least one of the rotating rollers is designated as a driving roller, which is connected to a driving motor (such as a stepping motor or a servo motor). At least one of the rotating rollers is designated as a driven roller. When the driving motor is started, the driving roller is driven to rotate. Since the test paper tape is tightly wound around the rotating rollers, sufficient static friction is generated between the driving roller and the inner side of the test paper tape. The static friction overcomes the resistance (such as bearing friction of the driven roller, rigidity of the test paper, etc.) in the entire conveying path, thereby dragging the entire test paper tape to move linearly and accurately. The test paper tape conveying mechanism 6 of the embodiment is also provided with a tensioning roller or a tensioning adjusting device, which applies a proper tension to the test paper tape. The tension ensures that the test paper tape is tightly wrapped around the driving roller, thereby generating sufficient friction driving force to prevent slipping.

[0034] The embodiment also comprises a support frame, and the dip stick mounting mechanism 2, the dip stick dismounting mechanism 4, the test paper tape conveying mechanism 6, the rotating disc 8 and the first driving mechanism are connected to the support frame. The first driving mechanism is used to drive the rotating disc 8 to rotate around the center of the rotating disc 8.

[0035] In the embodiment, the rotating disc 8, the dip stick mounting mechanism 2, the test paper tape conveying mechanism 6 and the dip stick dismounting mechanism 4 are arranged to be stably located above the conveyor 1, and the dip stick mounting mechanism 2 and the test paper tape conveying mechanism 6 are sequentially arranged in the circumferential direction of the rotating disc 8. The first driving mechanism of the embodiment is an electric motor, which can ensure that the rotating disc 8 rotates counterclockwise.

[0036] The dip stick fixing mechanism 5 of the embodiment comprises a connecting rod 503. The dip stick fixing mechanism 5 is fixed to the surface of the rotating disc 8 through one end of the connecting rod 503, thereby being fixedly connected to the rotating disc 8. The connecting rod 503 of the embodiment is internally provided with a cavity coaxially arranged with the connecting rod 503. The cavity is internally provided with a movable block 516 which can move along the axial direction of the cavity and is in sliding sealing cooperation with the cavity. The end of the connecting rod 503 away from the rotating disc 8 is provided with a connecting hole coaxially arranged with the cavity and in communication with the cavity. The end of the movable block 516 toward the connecting hole is provided with a first mounting blind hole 521 for accommodating the end of the dip stick 7. The side wall of the first mounting blind hole 521 is internally recessed to form a first groove. The first groove is internally provided with a first limiting block 517 and a first elastic member for driving the first limiting block 517 to be radially popped out. The side wall of the dip stick 7 is provided with a first limiting blind hole matched with the first limiting block 517. When the dip stick 7 is mounted on the dip stick fixing mechanism 5 at the mounting station, the first elastic member pushes the first limiting block 517 to be embedded in the first limiting blind hole, and the first limiting block 517 and the first limiting blind hole are in sliding sealing cooperation. The dip stick 7 and the first mounting blind hole 521 are in sliding sealing cooperation.

[0037] The cavity of the connecting rod 503 of the embodiment is provided with a second elastic member 504 above the movable block 516 for providing the movable block 516 with an elastic force towards the direction of the connecting hole, the end of the movable block 516 away from the direction of the connecting hole is provided with a connecting column 505, the second elastic member 504 is sleeved on the connecting column 505, and the sidewall of the connecting column 505 is further provided with a second limiting blind hole 523. The inner wall of the cavity of the connecting rod 503 of the embodiment is concave and formed with a second mounting blind hole 514 opposite to the connecting column 505, the sidewall of the second mounting blind hole 514 is concave and formed with a second groove, the second groove is provided with a second limiting block 513 and a third elastic member 512 for driving the second limiting block 513 to pop out radially. When the dip stick 7 is installed on the dip stick fixing mechanism 5 at the installation station, the third elastic member 512 pushes the second limiting block 513 to be embedded in the second limiting blind hole, and a sliding sealing fit is formed between the second limiting block 513 and the second limiting blind hole, and a sliding sealing fit is formed between the connecting column 505 and the second mounting blind hole 514.

[0038] The sampling device of the embodiment is further provided with a trigger control mechanism for releasing the limiting of the second limiting block 513 on the connecting column 505 at the dipping station and releasing the limiting of the first limiting block 517 on the dip stick 7 at the dismounting station.

[0039] In the specific implementation of the embodiment, in order to realize the sliding sealing fit, the following two ways can be used: way one, the fit gap between the outer diameter of the embedded block (such as the limiting block) and the inner diameter of the corresponding embedded hole (such as the limiting blind hole) is between 0.02-0.05mm, and lubricating grease is applied on the fit surface to enhance the sealing performance. Way two, a ring groove is formed on the cylindrical surface of the embedded block, and an O-shaped sealing ring is embedded to ensure that it can form an effective seal in the embedded hole. This sealing fit forms a temporary "air cylinder", when compressed air enters the bottom of the embedded hole, it can push the piston like, overcome the elastic force of the elastic member, and push the embedded block out.

[0040] In the embodiment, in order to ensure that the dip stick fixing mechanism 5 arranged can be stably connected with one end of the dip stick 7, the dip stick fixing mechanism 5 arranged includes a connecting rod 503, the dip stick mounting mechanism 2 arranged can insert one end of the dip stick 7 into the connecting hole of the connecting rod 503 and into the first mounting blind hole 512 of the movable block 516, when the first limiting blind hole on the sidewall of the dip stick 7 moves to be flush with the first limiting block 517, the first limiting block 517 can be inserted into the first limiting blind hole under the action of the first elastic member, thereby fixing one end of the dip stick 7 with the movable block 516, realizing the quick connection between the dip stick 7 and the dip stick fixing mechanism 5; one end of the dip stick 7 arranged is in a conical structure, ensuring that the end of the dip stick 7 can pass through the first limiting block 517.

[0041] In order to ensure that when the dip stick fixing mechanism 5 connected with the dip stick 7 is rotated to the vertical downward state under the action of the turntable 8, that is, the dip stick 7 connected on the connecting rod 503 is rotated to the top of the bean paste packaging bottle on the conveyor 1, in order to ensure that the dip stick 7 on the connecting rod 503 can be inserted into the packaging bottle, and the bean paste to be detected is successfully dipped, a second elastic member 504 and a connecting column 505 are arranged in the cavity in the connecting rod 503. When one end of the dip stick 7 is inserted into the connecting hole of the connecting rod 503 by using the dip stick mounting mechanism 2, the dip stick 7 is forced to move in the cavity and compress the second elastic member 504 under the action of the dip stick mounting mechanism 2, the connecting column 505 is inserted into the second mounting blind hole 514 in the movement of the movable block 516, when the second limiting blind hole 523 on the side wall of the connecting column 505 moves to the same level as the second limiting block 513, the second limiting block 513 is inserted into the second limiting blind hole 523 under the action of the third elastic member 512, thereby fixing the connecting column 505 in the second mounting blind hole 514, and the purpose of fixing the movable block 514 in the cavity is achieved, and the purpose of retracting the dip stick 7 to part of the connecting rod 503 is achieved; when the connecting rod 503 provided with the dip stick 7 is rotated to the top of the packaging bottle by the turntable 8, the constraint of the second limiting block 513 on the connecting column 505 is removed, at this time, the movable block 516 can be pushed to move downward under the action of the second elastic member 504, so as to insert the dip stick 7 into the packaging bottle, and the dipping of the bean paste is realized. The end of the connecting column 505 provided in the embodiment is a conical structure, which ensures that the end of the connecting column 505 can smoothly pass through the second limiting block 513.

[0042] When the second limiting block is locked in the embodiment, the second elastic member is compressed and stores elastic potential energy. Once the second limiting block is released at the dipping station, the stored elastic potential energy is released instantly, which is converted into the kinetic energy of the movable block and the dip stick, so that the dip stick is quickly inserted into the bean paste with a high speed and a powerful action. For the bean paste which is viscous and contains solid particles, slow insertion may push the paste or fail to penetrate the surface film. A standardized insertion action with a fast and powerful speed can ensure that a sufficient and representative sample is obtained every time, and is not affected by the surface state of the paste. The rapid downward movement of the movable block will squeeze the second air bag, and the airflow generated by the compression of the second air bag is the direct power source for triggering the unlocking and retraction of the dip stick head. Therefore, the locking and releasing mechanism of the second limiting block in the embodiment is the core hub for coupling and linking the two actions of "dipping" and "anti-dripping and retraction", which can ensure the consistency and reliability of sampling, simulates the best practice of "quick dipping" of skilled workers, and avoids insufficient sampling or uneven adhesion caused by slow contact. The mechanism forcibly links the dipping action and the anti-dripping action, and as long as the dipping is completed, the dip stick head will be retracted, which is an inherent and reliable anti-pollution design.

[0043] The trigger control mechanism of the embodiment comprises a guide disc, a pressing ball 501 and a first air bag 502, wherein the guide disc is fixed on the support frame and coaxially arranged with the rotating disc 8, the first air bag 502 is fixed on the end of the connecting rod 503 connected with the rotating disc 8, the pressing ball 501 is arranged on the first air bag 502 and located between the first air bag 502 and the guide disc, the guide disc is provided with a first protruding part for pressing the pressing ball 501 when the dip stick 7 rotates to the dipping position and a second protruding part for pressing the first air bag 502 when the dip stick 7 rotates to the dismounting position.

[0044] The connecting rod 503 of the embodiment is provided with a vertically arranged cylindrical accommodating cavity, which is located above the cavity and coaxially arranged with the cavity; the connecting rod 503 is provided with a first channel 508, a second channel 510 and a third channel 511, the first channel 508 communicates the accommodating cavity with the second mounting blind hole 514, and the opening of the first channel 508 arranged at one end of the accommodating cavity is located at the top of the side wall of the accommodating cavity. The second channel 510 of the embodiment communicates the accommodating cavity with the first air bag 502, and the opening of the second channel 510 arranged at one end of the accommodating cavity is located at the middle of the side wall of the accommodating cavity. The third channel 511 of the embodiment communicates the cavity region above the movable block 516 in the cavity with the accommodating cavity, and the opening of the third channel 511 arranged at one end of the accommodating cavity is located at the bottom of the side wall of the accommodating cavity. The accommodating cavity is provided with a plugging ball 509 matched with the inner diameter of the accommodating cavity, and the diameter of the plugging ball 509 is less than one half of the vertical height of the accommodating cavity. In the embodiment, the difference between the inner diameter of the accommodating cavity and the outer diameter of the plugging ball is in the range of 0.1-0.3mm, which not only ensures smooth rolling of the ball, but also forms effective air tightness after the ball is seated. In order to ensure the sealing performance, the top and bottom of the accommodating cavity are provided with tapered sealing surfaces or annular sealing flanges in the specific design, which are matched with the spherical surface of the plugging ball to increase the contact area and improve the sealing reliability. In the embodiment, the plugging ball is a rubber-coated metal ball or a pure silica gel ball, which further enhances the sealing by using its elasticity.

[0045] The connecting column 505 of the embodiment is provided with a sixth channel 524 connected with the second limiting blind hole 523, and the other end opening of the sixth channel 524 relative to the second limiting blind hole 523 is located at the top of the connecting column 505. The movable block 516 of the embodiment is provided with a fourth channel 518 connected with the cavity region above the movable block 516 in the cavity and the first mounting blind hole 521, and the other end opening of the fourth channel 518 relative to the cavity is located at the top of the first mounting blind hole 521; the dip stick 7 is provided with a fifth channel, one end of which is communicated with the first limiting blind hole, and the other end is communicated with the fourth channel 518 through the cavity between the top end of the dip stick 7 in the first mounting blind hole 521 and the movable block 516.

[0046] In order to realize the automatic unlocking of the second limiting block 513 in the embodiment, the second limiting block 513 removes the constraint on the connecting column 505, so the first air bag 502 and the extrusion ball 501 are also arranged on the connecting rod 503, and the guide disc 203 is also arranged on the support frame, and the first protruding part and the second protruding part are arranged on the guide disc 203, so that when the connecting rod 503 on which the dip stick 7 is installed is driven to rotate from the horizontal direction to the vertical downward direction in the counterclockwise direction, the extrusion ball 501 arranged moves downward along the outer surface of the first protruding part, and the extrusion ball 501 gradually extrudes the first air bag 502 arranged in the process of moving along the first protruding part, forcing the air in the first air bag 502 to be extruded into the containing cavity, and the air is transmitted from the containing cavity into the first channel 508, and the air entering into the first channel 508 enters into the sixth channel 524, and finally forces the air to enter into the second limiting blind hole 523, and uses the air pressure to extrude the second limiting block 513 in the second limiting blind hole 523 into the second groove, when the extrusion ball 501 rotates to the lowermost end of the first protruding part, the air entering into the second limiting blind hole 523 at this time just removes the second limiting block 513 completely, so that the constraint of the second limiting block 513 on the connecting column 505 is removed, and at this time, the movable block 516 can be pushed to move downward in the cavity under the action of the second elastic member 504, so as to drive the dip stick 7 to extend into the packaging bottle and dip the bean paste in the packaging bottle.

[0047] In order to achieve the separation between the dip stick 7 and the movable block 516, the blocking ball 509 is arranged in the accommodating cavity in the connecting rod 503. When the dip stick 7 on the connecting rod 503 is rotated to the vertical downward state, the blocking ball 509 in the accommodating cavity is located at the lower end of the accommodating cavity under the action of gravity. At this time, the blocking ball 509 blocks the third channel 511, and the first channel 508 is in an open state. Therefore, when the first air bag 502 is extruded by the first protruding part, the air in the first air bag 502 can be transmitted to the second mounting blind hole 514 through the first channel 508, so as to unlock the second limiting block 513. When the dip stick 7 on the connecting rod 503 is rotated to the vertical upward state, when the connecting rod 503 is at a certain inclination angle, the blocking ball 509 arranged is rotated to the other end of the accommodating cavity under the action of gravity. At this time, the blocking ball 509 blocks the first channel 508, and the third channel 511 is in an open state. Therefore, as the connecting rod 503 continues to rotate, the extrusion ball 501 arranged is extruded to the first air bag 502 again under the action of the second protruding part, so as to force the air in the first air bag 502 to be transmitted to the fourth channel 518 through the third channel 511. Then the air enters the first limiting blind hole through the fifth channel, so as to push the first limiting block 517 in the first limiting blind hole to move back. When the connecting rod 502 is rotated to the vertical upward state, the air in the first air bag 502 is just removed from the first limiting blind hole, so as to remove the constraint of the first limiting block 517 on the dip stick 7, and ensure that the dip stick dismounting mechanism 4 can remove the used dip stick 7 from the connecting rod 503.

[0048] The first air bag 502 is provided with an air inlet, and the air inlet and the second channel 510 are provided with one-way valves. The one-way valve in the air inlet ensures that the gas outside can enter the first air bag 502, but the air in the first air bag 502 cannot be discharged through the air inlet. The one-way valve in the second channel 510 ensures that the air in the first air bag 502 can be transmitted in the second channel 510, but the air in the second channel 510 cannot flow back. In the specific design, the first air bag 502 can also be provided with a reset spring.

[0049] The sampling end of the dip stick 7 is provided with a dip head 701, and the sampling end of the dip stick 7 is provided with a third mounting blind hole. The inner wall of the third mounting blind hole is concave to form a third limiting blind hole. The side wall of the dip head 701 is provided with a third groove, and the third groove is provided with a fifth elastic element and a third limiting block 705. The dip head 701 pushes the third limiting block 705 to insert into the third limiting blind hole through the fifth elastic element to realize the connection with the dip stick 7. The third mounting blind hole is provided with a fourth elastic element 704 connected to the top of the third mounting blind hole and the top of the dip head 701.

[0050] The cavity of the connecting rod 503 of the embodiment further has a second air bag 515 below the movable block 516, and the connecting rod 503 is provided with a seventh channel connecting the second air bag 515 and the side wall of the connecting hole. The side wall of the dip stick 7 of the embodiment is provided with an annular groove 703, and the dip stick 7 is provided with an eighth channel 706 connecting the annular groove 703 and the third limiting blind hole. When the movable block 516 moves downward under the action of the second elastic member 504, the movable block 516 extrudes the second air bag 515 to generate airflow. When the annular groove 703 on the side wall of the dip stick 7 moves to the seventh channel, the airflow enters the annular groove 703 on the side wall of the dip stick 7 through the seventh channel, and is transmitted to the third limiting blind hole through the eighth channel 706, so that the third limiting block 705 is retracted and unlocked. The dip head 701 is retracted under the action of the fourth elastic member 704.

[0051] In order to ensure that the dip stick 7 can be smoothly removed from the packaging bottle, a third mounting blind hole is arranged at the end of the dip stick 7, a fourth elastic member 704 and a dip head 701 are arranged in the third mounting blind hole, and the fourth elastic member 704 can pull the dip head 701 to partially retract into the third mounting blind hole when it is not subjected to external force. When the dip sticks 7 are stacked in the dip stick mounting mechanism 2, the operator needs to pull the dip head 701 outward, forcing the third limiting block 705 on the side wall of the dip head 701 to be inserted into the third limiting blind hole under the action of the fifth elastic member, at this time, the fourth elastic member 704 is in a stretched state. Therefore, when the connecting rod 503 driven by the turntable 8 rotates to the vertical downward state, the first air bag 502 is extruded under the action of the first protruding part at this time, the unlocking of the second limiting block 513 is realized, and the movable block 516 can quickly push the dip stick 7 to move downward under the action of the second elastic member 504, so that the dip head 701 at the bottom of the dip stick 7 extends into the bean paste packaging bottle, and the dip head 701 dips the bean paste. When the movable block 516 moves in the cavity, the second air bag 515 is extruded, and at the same time, the annular groove 703 on the side wall of the dip stick 7 moves to the seventh passage. In this way, when the movable block 516 extrudes the second air bag 515, the air in the second air bag 515 enters the annular groove 703 through the seventh passage, and then the air enters the third limiting blind hole through the eighth passage 706, extruding the third limiting block 705 back. After the third limiting block 705 is completely removed from the third limiting blind hole, the dip head 701 is retracted back under the action of the fourth elastic member 704, so as to realize the purpose of removing the dip head 701 with the bean paste from the packaging bottle. In order to rotate the dip head 701 with the bean paste to the test paper tape 602 for the purpose of detecting aspergillus flavus in the bean paste.

[0052] The dip stick mounting mechanism 2 of the embodiment comprises a feeding box 202 and a second driving mechanism 201, the feeding box 202 is connected with the support frame, a plurality of dip sticks 7 are arranged in the feeding box 202, the plurality of dip sticks 7 are stacked in the feeding box 202 from bottom to top, a discharge port 203 is arranged on the side wall of the feeding box 202 facing the turntable 8, and the output shaft of the second driving mechanism 201 penetrates into the feeding box 202 and is fixed to the side wall of the feeding box 202. The second driving mechanism 201 of the embodiment is used to push the lowermost dip stick 7 in the feeding box 202 out of the discharge port 203 and insert it into the connecting hole of the dip stick fixing mechanism 5 when the dip stick 7 is installed.

[0053] In order to enable the automatic connection of the dip stick 7 with the connecting rod 503 from the dip stick mounting mechanism 2, the dip stick mounting mechanism 2 in the embodiment comprises a feeding box 202 and a second driving mechanism 201, and the second driving mechanism 201 is a pneumatic cylinder or a hydraulic cylinder. Before use, the dip sticks 7 to be used are stacked in the feeding box 202 from bottom to top. During work, the second driving mechanism 201 pushes the dip stick 7 at the bottom layer of the feeding box 202 to move in the horizontal direction from the discharge port 203, so that the end of the dip stick 7 is inserted into the movable block 516 of the connecting rod 503, and the first limiting block 517 is used to fix the dip stick 7 on the movable block 516. When the second driving mechanism 201 retreats to the initial position, the dip sticks 7 in the feeding box 202 are filled in sequence under the action of gravity, so as to continue to feed the dip sticks 7 subsequently.

[0054] The dip stick dismounting mechanism 4 in the embodiment comprises a third driving mechanism, a fourth driving mechanism and a discharging rod 406. The third driving mechanism is connected with the support frame, the output end of the third driving mechanism is connected with the fourth driving mechanism, the third driving mechanism is used to drive the fourth driving mechanism to move in the vertical direction, the discharging rod 406 is horizontally arranged, and the output end of the fourth driving mechanism is connected with one end of the discharging rod 406 and is used to drive the discharging rod 406 to move in the horizontal direction. The other end of the discharging rod 406 opposite to the end connected with the fourth driving mechanism is provided with a fourth mounting blind hole, the fourth mounting blind hole is provided with a sixth elastic member 403 and an extrusion rod 402 with an outer diameter consistent with the inner diameter of the fourth mounting blind hole, a third air bag 401 is arranged on the side wall of the discharging rod 406 and surrounds the discharging rod 406, the third air bag 401 is communicated with the fourth mounting blind hole through an air pipe, and a one-way valve is arranged in the air pipe and is used to limit the one-way flow of gas from the fourth mounting blind hole to the third air bag 401. The side wall of the dip stick 7 is provided with a connector, and a limiting groove is arranged on the inner wall of the connector. When the discharging rod 406 is horizontally inserted into the connector of the side wall of the dip stick 7, the third air bag 401 is expanded and clamped into the limiting groove in the connector.

[0055] The third driving mechanism and the fourth driving mechanism in the embodiment are both air cylinders or hydraulic cylinders. When the dip head 701 contacts the test strip 602, the rotating disc rotates the connecting rod 503 to an upright upward state, and then the first air bag 502 is used to unlock the first limiting block 517. Then the fourth driving mechanism is used to drive the unloading rod 406 to move horizontally and insert into the interface on the side wall of the dip stick 7. When the extrusion rod 402 on the unloading rod 406 extends into the interface, the interface decompresses the connecting extrusion rod 402, forcing the extrusion rod 402 to retreat into the fourth mounting blind hole. The extrusion rod 402 extrudes the air in the fourth mounting blind hole during the retreat, forcing the air to shift to the third air bag 401, and finally making the third air bag 401 expand in the limiting groove. The third air bag 401 in the expanded state can prevent the dip stick 7 from falling off the unloading rod 406. Then the third driving mechanism is used to drive the fourth driving mechanism to move upward, so as to move the dip stick 7 out of the connecting rod 503.

[0056] The embodiment also includes a collection box 301 connected with the support frame, and the collection box 301 is provided with an opening on one side. The top of the opening end of the collection box 301 is provided with a seventh elastic member 302 arranged vertically and a vertical rod 303 connected with the seventh elastic member 302. The unloading rod 406 is also provided with a containing cavity, and the containing cavity is provided with an eighth elastic member 405 and a blocking block 404. The side wall of the unloading rod 406 is provided with an exhaust port communicated with the containing cavity. The eighth elastic member 405 is used to push the blocking block 404 to block the exhaust port. The air pipe is connected with the containing cavity, and the one-way valve is arranged on the air pipe line between the containing cavity and the fourth mounting blind hole.

[0057] When the third driving mechanism drives the dip stick 7 on the fourth driving mechanism to move vertically upward to the opening of the collection box 301, the side wall of the unloading rod 406 extrudes the vertical rod 303 upward. At this time, the fourth driving mechanism drives the dip stick 7 on the unloading rod 406 to move horizontally, and pushes the used dip stick 7 into the collection box 301. When the unloading rod 406 moves horizontally, when the exhaust port on the unloading rod 406 moves to the same vertical direction as the vertical rod 303, the vertical rod 303 is inserted into the exhaust port and pushes the blocking block 404 to retreat under the action of the seventh elastic member 302. At this time, the third air bag 401 is connected with the outside under the action of the exhaust port, so as to exhaust the air in the third air bag 401, remove the constraint of the third air bag 401 on the unloading rod 406, and ensure that the unloading rod 406 can move out of the interface on the dip stick 7 installed in the collection box 301, so as to continue to unload the next dip stick 7.

[0058] The lower end of the vertical rod 303 in the embodiment is a conical structure, which ensures that the vertical rod 303 can be smoothly removed from the exhaust port.

[0059] The one-way valve is arranged in the air pipe connected with the fourth mounting blind hole, so that the air in the fourth mounting blind hole can enter the containing cavity through the air pipe, the air in the containing cavity enters the third air bag 401 through the air pipe between the containing cavity and the third air bag 401, and the purpose of inflating the third air bag 401 is achieved. In order to prevent the dip stick 7 from being pushed off the feeding rod 406 under the action of the sixth elastic member 403 after the dip stick 7 is taken out from the connecting rod 503, the one-way valve is arranged in the air pipe connected with the fourth mounting blind hole. The extrusion rod 402 is provided with an exhaust port penetrating through both ends of the extrusion rod 402. When the feeding rod 406 is taken off from the dip stick 7, the external air enters the fourth mounting blind hole under the action of the exhaust port, so that the extrusion rod 402 can be stretched out from the fourth mounting blind hole again.

[0060] To ensure the air tightness of the pneumatic control circuit in the embodiment, the material of each component (such as the connecting rod, the movable block and the dip stick) constituting the air path channel is very important. These components should be made of materials with high density, low porosity and low gas permeability. Preferably, the connecting rod and the movable block can be made of stainless steel or aluminum alloy through precise mechanical processing to ensure the structural strength and inherent density. Alternatively, to reduce the cost and weight, the components can also be made of engineering plastics such as polyoxymethylene (POM) or polyamide (PA66) through injection molding. These materials themselves have excellent air tightness and wear-resistant self-lubricating properties, and are very suitable for components with relative motion. For the key parts (such as the matching surface of the limiting block and the limiting blind hole) that realize'sliding sealing fit', regardless of the material, the machining precision (such as H7 / g6 tolerance grade) and surface finish can be controlled to achieve this. In addition, as a more reliable sealing solution, a ring groove can be opened in the first limiting block, the second limiting block and the like and an O-shaped rubber sealing ring can be assembled, and the elastic deformation of the sealing ring is used to compensate for the machining error, so as to ensure the formation of a closed 'unlocking pressure chamber'. Those skilled in the art know that under the guidance of the above principles, a variety of known dense materials can be selected according to specific performance requirements and cost budgets, and conventional sealing means can be used to reliably achieve the air tightness function required by the present application.

[0061] In the specific implementation of the embodiment, the movements of the transmission mechanism, the test strip conveying mechanism and the turntable must be strictly synchronized, that is, they must run at the same frequency. This synchronization is the key to ensuring that each bottle of bean paste can be accurately sampled and each sample can be applied to a new and clean test paper. The synchronization logic and implementation are as follows: the running beat of the entire device is based on the intermittent rotary motion of the turntable. The turntable completes a work cycle every time it rotates one station (90 degrees). The transmission mechanism and the test strip conveying mechanism must completely match this cycle period.

[0062] The synchronization relationship and logic of the three are as follows: Synchronization between the turntable and the transmission mechanism: one turntable station is equal to one packaging bottle interval. When the turntable carries a dipstick to rotate to the dipping station and stops, the transmission mechanism must transport a to-be-detected soy paste packaging bottle just below the dipstick. After the turntable rotates away, the transmission mechanism starts immediately to move away the current packaging bottle and transport the next packaging bottle to the next dipping station, waiting for the next stop of the turntable. In this way, it is ensured that each packaging bottle has and only has one sampling opportunity, and the dipstick can be accurately inserted into the bottle to avoid collision with the packaging bottle.

[0063] Synchronization between the turntable and the test paper tape conveying mechanism: one turntable station is equal to one test paper interval. When the turntable carries a dipstick with a dipped sample to rotate to the detection station and stops, the test paper tape conveying mechanism must transport a new unused test paper just below the dipstick. After the smearing action is completed, the test paper tape immediately transports forward by one step, so that the next new test paper is in place, waiting for the smearing of the next sample. In this way, it is ensured that each sample is independently smeared on a new test paper, preventing sample cross contamination and ensuring the accuracy of the detection result.

[0064] Those skilled in the art can realize the above synchronization through various mature control schemes, for example: Centralized control scheme (preferred): a programmable logic controller (PLC) is used as the core of the system. The PLC issues unified time sequence control instructions to the first driving mechanism (turntable motor), the driving motor of the transmission mechanism and the driving motor of the test paper tape conveying mechanism. Through program setting, the start-stop time and movement distance of the three mechanisms are accurately matched with the intermittent rotation period of the turntable. All motors preferably use servo motors or stepper motors to realize high-precision position control.

[0065] Mechanical linkage scheme: a main motor can also be used to drive the turntable, and mechanical transmission mechanisms such as gear, sprocket or cam divider can be used to distribute and synchronize power to the transmission mechanism and the test paper tape conveying mechanism.

[0066] The automatic sampling equipment provided by the present application realizes a high-efficiency, automatic and consistent sampling and sample loading method for viscous paste samples. Although the above embodiments are described by taking the detection of aflatoxin as an example, the application of the present equipment is not limited to this.

[0067] Specifically, the device can automatically and accurately apply the sample to be tested to the test strip that meets the industry standard. Therefore, as long as the mycotoxin or other microbial indicators can be detected by the immunochromatographic test paper method, the device can complete the automatic sampling and detection by replacing the type of test strip on the test strip conveying mechanism.

[0068] For example, in the production and storage of bean paste, other toxin-producing molds may be contaminated in addition to Aspergillus flavus, and corresponding mycotoxins may be produced. These toxins can also be detected by specific immunochromatographic test paper, including but not limited to: Ochratoxin A: mainly produced by Aspergillus ochraceus and carbon black Aspergillus, with nephrotoxicity and carcinogenicity.

[0069] Patulin: mainly produced by Penicillium expansum and Urtica Penicillium, which is a neurotoxin.

[0070] Zearalenone: mainly produced by Fusarium graminearum, with estrogen-like effects.

[0071] For the detection of any of the above mycotoxins, the sampling device of the present application can reliably complete the core step of dipping the bean paste sample and applying it to the corresponding test strip through its dipstick fixing mechanism, turntable and trigger control mechanism. Therefore, the present application essentially provides a universal automatic sampling platform, and the detection target is determined by the type of test paper loaded, which has good expandability and wide application prospect.

[0072] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A sampling device for detecting aflatoxins in a bean paste, characterized by, The dip stick mounting mechanism (2), the dip stick dismounting mechanism (4), the test paper tape conveying mechanism (6), the rotating disc (8) and the first driving mechanism are all connected with the support frame, and the first driving mechanism is used to drive the rotating disc (8) to rotate around the center of the rotating disc (8). The dip stick fixing mechanism (5) comprises a connecting rod (503), and the dip stick fixing mechanism (5) is fixedly connected with the rotating disc (8) through the connecting rod (503) at one end of the connecting rod (503); a cavity coaxial with the connecting rod (503) is arranged in the connecting rod (503); a movable block (516) which can move along the axial direction of the cavity and is in sliding sealing cooperation with the cavity is arranged in the cavity; a connecting hole coaxial with the cavity and in communication with the cavity is arranged at the end of the connecting rod (503) away from the rotating disc (8); a first mounting blind hole (521) for accommodating the end of the dip stick (7) is arranged at the end of the movable block (516) facing the connecting hole; a first recess is formed in the side wall of the first mounting blind hole (521); a first limiting block (517) and a first elastic member for driving the first limiting block (517) to be radially ejected are arranged in the first recess; a first limiting blind hole matched with the first limiting block (517) is arranged on the side wall of the dip stick (7); when the dip stick (7) is mounted on the dip stick fixing mechanism (5) at a mounting station, the first elastic member pushes the first limiting block (517) to be embedded in the first limiting blind hole, and the first limiting block (517) and the first limiting blind hole are in sliding sealing cooperation, and the dip stick (7) and the first mounting blind hole (521) are in sliding sealing cooperation; 2. The sampling device for detecting aflatoxins in a bean paste according to claim 1, wherein The dip stick fixing mechanism (5) comprises a connecting rod (503), and the dip stick fixing mechanism (5) is fixedly connected with the rotating disc (8) through the connecting rod (503) at one end of the connecting rod (503); a cavity coaxial with the connecting rod (503) is arranged in the connecting rod (503); a movable block (516) which can move along the axial direction of the cavity and is in sliding sealing cooperation with the cavity is arranged in the cavity; a connecting hole coaxial with the cavity and in communication with the cavity is arranged at the end of the connecting rod (503) away from the rotating disc (8); a first mounting blind hole (521) for accommodating the end of the dip stick (7) is arranged at the end of the movable block (516) facing the connecting hole; a first recess is formed in the side wall of the first mounting blind hole (521); a first limiting block (517) and a first elastic member for driving the first limiting block (517) to be radially ejected are arranged in the first recess; a first limiting blind hole matched with the first limiting block (517) is arranged on the side wall of the dip stick (7); when the dip stick (7) is mounted on the dip stick fixing mechanism (5) at a mounting station, the first elastic member pushes the first limiting block (517) to be embedded in the first limiting blind hole, and the first limiting block (517) and the first limiting blind hole are in sliding sealing cooperation, and the dip stick (7) and the first mounting blind hole (521) are in sliding sealing cooperation; 3. The sampling device for detecting aflatoxins in a bean paste according to claim 2, wherein ​ The cavity of the connecting rod (503) is provided with a second elastic member (504) above the movable block (516) for providing the movable block (516) with an elastic force towards the direction of the connecting hole, the end of the movable block (516) away from the direction of the connecting hole is provided with a connecting column (505), the second elastic member (504) is sleeved on the connecting column (505), and the side wall of the connecting column (505) is further provided with a second limiting blind hole (523); the inner wall of the cavity of the connecting rod (503) is concave and formed with a second mounting blind hole (514) opposite to the connecting column (505), the side wall of the second mounting blind hole (514) is concave and formed with a second groove, the second groove is provided with a second limiting block (513) and a third elastic member (512) for driving the second limiting block (513) to be radially popped out; when the dip stick (7) is installed on the dip stick fixing mechanism (5) at the installation station, the third elastic member (512) pushes the second limiting block (513) to be embedded in the second limiting blind hole, and the second limiting block (513) and the second limiting blind hole form a sliding sealing fit, and the connecting column (505) and the second mounting blind hole (514) form a sliding sealing fit; The sampling device is further provided with a trigger control mechanism for releasing the second limiting block (513) from limiting the connecting column (505) at the dipping station and releasing the first limiting block (517) from limiting the dip stick (7) at the dismounting station.

4. The sampling device for detecting aflatoxins in a bean paste according to claim 3, wherein The trigger control mechanism comprises a guide disc, a squeezing ball (501) and a first air bag (502), the guide disc is fixed on the support frame and coaxially arranged with the rotating disc (8), the first air bag (502) is fixed to the end head part of the connecting rod (503) and the connecting end of the rotating disc (8), the squeezing ball (501) is arranged on the first air bag (502) and located between the first air bag (502) and the guide disc, the guide disc is provided with a first protruding part for squeezing the squeezing ball (501) when the dip stick (7) is rotated to the dipping station, and a second protruding part for squeezing the first air bag (502) when the dip stick (7) is rotated to the dismounting station; The connecting rod (503) is provided with a vertically arranged cylindrical accommodating cavity, which is arranged above the cavity coaxially; the connecting rod (503) is provided with a first channel (508), a second channel (510) and a third channel (511), the first channel (508) is communicated with the accommodating cavity and the second mounting blind hole (514), and the opening of the first channel (508) arranged at one end of the accommodating cavity is located at the top of the side wall of the accommodating cavity; the second channel (510) is communicated with the accommodating cavity and the first air bag (502), and the opening of the second channel (510) arranged at one end of the accommodating cavity is located at the middle of the side wall of the accommodating cavity; the third channel (511) is communicated with the cavity region above the movable block (516) in the cavity and the accommodating cavity, and the opening of the third channel (511) arranged at one end of the accommodating cavity is located at the bottom of the side wall of the accommodating cavity; the accommodating cavity is provided with a plugging ball (509) matched with the inner diameter of the accommodating cavity, and the diameter of the plugging ball (509) is less than one half of the vertical height of the accommodating cavity; The connecting column (505) is provided with a sixth channel (524) connected to the second limiting blind hole (523), and the other end opening of the sixth channel (524) relative to the second limiting blind hole (523) is located at the top of the connecting column (505); The movable block (516) is provided with a fourth channel (518) connected to the cavity region above the movable block (516) in the cavity and the first mounting blind hole (521), and the other end opening of the fourth channel (518) relative to the cavity is located at the top of the first mounting blind hole (521); the dip stick (7) is provided with a fifth channel, one end of the fifth channel is communicated with the first limiting blind hole, and the other end of the fifth channel is communicated with the fourth channel (518) through the cavity between the top end of the dip stick (7) in the first mounting blind hole (521) and the movable block (516).

5. The sampling device for detecting aflatoxins in a bean paste according to claim 3, wherein The sampling end of the dip stick (7) is provided with a dip head (701), and the sampling end of the dip stick (7) is provided with a third mounting blind hole, the inner wall of the third mounting blind hole is concave and provided with a third limiting blind hole, the side wall of the dip head (701) is provided with a third groove, the third groove is provided with a fifth elastic element and a third limiting block (705), the dip head (701) is connected with the dip stick (7) by pushing the third limiting block (705) into the third limiting blind hole through the fifth elastic element; the third mounting blind hole is provided with a fourth elastic element (704) connected to the top of the third mounting blind hole and the top of the dip head (701) at both ends; The cavity of the connecting rod (503) is also provided with a second air bag (515) below the movable block (516), and the connecting rod (503) is provided with a seventh channel connecting the second air bag (515) and the side wall of the connecting hole; the side wall of the dip stick (7) is provided with an annular groove (703), and the dip stick (7) is provided with an eighth channel (706) connecting the annular groove (703) and the third limiting blind hole; when the movable block (516) moves downward under the action of the second elastic element (504), the movable block (516) extrudes the second air bag (515) to generate airflow, when the annular groove (703) on the side wall of the dip stick (7) moves to the seventh channel, the airflow enters the annular groove (703) on the side wall of the dip stick (7) through the seventh channel, and is transmitted to the third limiting blind hole through the eighth channel (706), so that the third limiting block (705) is retracted and unlocked, and the dip head (701) is retracted under the action of the fourth elastic element (704).

6. The sampling device for detecting aflatoxins in a bean paste according to claim 2, wherein The dip stick mounting mechanism (2) comprises a feeding box (202) and a second driving mechanism (201), the feeding box (202) is connected with the support frame, a plurality of dip sticks (7) are arranged in the feeding box (202), and the plurality of dip sticks (7) are stacked in the feeding box (202) from bottom to top; a discharge port (203) is arranged on the side wall of the feeding box (202) facing the direction of the rotating disc (8); and the second driving mechanism (201) is fixed to the side wall of the feeding box (202) and its output shaft penetrates into the feeding box (202).

7. The sampling device for detecting aflatoxins in the bean paste according to any one of claims 2 to 6, characterized in that, The dip stick mounting mechanism (2) comprises a feeding box (202) and a second driving mechanism (201), the feeding box (202) is connected with the support frame, a plurality of dip sticks (7) are arranged in the feeding box (202), and the plurality of dip sticks (7) are stacked in the feeding box (202) from bottom to top; a discharge port (203) is arranged on the side wall of the feeding box (202) facing the direction of the rotating disc (8); and the second driving mechanism (201) is fixed to the side wall of the feeding box (202) and its output shaft penetrates into the feeding box (202). The dip stick mounting mechanism (2) comprises a feeding box (202) and a second driving mechanism (201), the feeding box (202) is connected with the support frame, a plurality of dip sticks (7) are arranged in the feeding box (202), and the plurality of dip sticks (7) are stacked in the feeding box (202) from bottom to top; a discharge port (203) is arranged on the side wall of the feeding box (202) facing the direction of the rotating disc (8); and the second driving mechanism (201) is fixed to the side wall of the feeding box (202) and its output shaft penetrates into the feeding box (202). The other end of the discharging rod (406) opposite to the fourth driving mechanism is provided with a fourth mounting blind hole, a sixth elastic element (403) and an extrusion rod (402) with an outer diameter consistent with the inner diameter of the fourth mounting blind hole are arranged in the fourth mounting blind hole, a third air bag (401) is arranged on the side wall of the discharging rod (406), the third air bag (401) is communicated with the fourth mounting blind hole through a gas pipe, and a one-way valve for limiting one-way flow of gas from the fourth mounting blind hole to the third air bag (401) is arranged in the gas pipe. An interface is arranged on the side wall of the dip stick (7), and a limiting groove is arranged on the inner wall of the interface; when the discharging rod (406) is horizontally inserted into the interface on the side wall of the dip stick (7), the third air bag (401) is expanded and clamped into the limiting groove in the interface.

8. The sampling device for detecting aflatoxins in a bean paste according to claim 7, wherein Also include a collection box (301), the collection box (301) is connected with support frame, one side of the collection box (3) is equipped with opening; The top of the opening end of the collection box (301) is provided with a seventh elastic member (302) arranged vertically and a vertical rod (303) connected with the seventh elastic member (302); The blanking rod (406) is further provided with a containing cavity, the containing cavity is provided with an eighth elastic member (405) and a blocking block (404), the side wall of the blanking rod (406) is provided with an exhaust port communicated with the containing cavity, the eighth elastic member (405) is used for pushing the blocking block (404) to block the exhaust port, the air pipe is connected with the containing cavity, and the one-way valve is arranged on the air pipe pipeline between the containing cavity and the fourth mounting blind hole.

Images