A double-turntable optical detection module reagent automatic adding device and a portable food safety detector

Abstract

This utility model provides an automatic reagent adding device for modular systems, relating to the field of food safety testing technology. It adds reagents to two sets of rotary optical detection modules, including a swing arm module and 2-3 supply modules. Each supply module includes a reagent bottle connected to the pump inlet via hose I and a nozzle connected to the pump outlet via hose II. The swing arm module includes a motor I fixed inside a housing and a swing arm. The drive shaft of motor I is connected to the swing arm, and the nozzle is located at the other end of the swing arm. Motor I drives the swing arm to rotate around the drive shaft, further rotating the nozzle to a designated position before stopping. Different pumps spray reagents from different reagent bottles into cuvettes through hoses I, hose II, and the nozzle. A portable food safety testing instrument is also provided, including a housing and a lid. The housing is equipped with the automatic reagent adding device and two sets of optical detection modules. Advantages: Saves manpower, simplifies and facilitates the testing process, and the device is easy to carry.

Description

Technical Field

[0001] This utility model relates to the technical field of comprehensive food safety testing devices, and in particular provides an automatic reagent addition device for a dual-rotor optical detection module and a portable food safety testing instrument. Background Technology

[0002] Our company developed a fully automatic intelligent liquid pesticide residue detector in 2017 and applied for a patent (application number: 201720636678.8). In 2018, we developed a portable multifunctional food safety detector (patent application number: 201920115742.7). This detector integrates multiple functions. With a spectrophotometer module, it can detect common pesticide residues, excessive additives, and prohibited additives in food. With a pesticide residue detection module, it can detect common pesticide residues in food. With a gold standard module, it can detect common veterinary drug residues, biotoxins, and prohibited additives in food. It also includes an ATP detector to detect the cleanliness of food, tableware, and hands. Furthermore, it features Bluetooth, USB, and WiFi interfaces. This instrument boasts a variety of functions, making data export and uploading more convenient. Equipped with a large-capacity lithium-ion battery, it can operate continuously for at least 3 hours without an external power source. The miniature thermal printer allows for real-time printing of test data, with customizable printouts. The touchscreen display enables easy control of all modules, simplifying operation. A sound system provides prompts for correct operation, alerts during timing, and automatically announces data. Indicator lights, based on their color, indicate whether the test is complete, detect any abnormalities, and display the working status and status of the functional areas. This versatile and portable instrument is highly functional.

[0003] In recent years, a number of similar products have appeared on the market. For example, patent application number 201720701331.7 discloses a portable food safety comprehensive analysis device. By setting up a spectrophotometer detection device and a colloidal gold detection device, it can meet the market's comprehensive analysis detection needs and detect a variety of types. At the same time, the spectrophotometer detection device and the colloidal gold detection device share a processor (i.e., a highly integrated industrial control computer) and a display screen (i.e., a screen panel), which saves space and reduces the overall size of the device.

[0004] Patent application number 202211570903.4 discloses an integrated standardized rapid pesticide residue detection device and method. By designing an automated rapid pesticide residue detection device using an integrated standardized rapid pesticide residue detection kit, the device automatically completes all detection operations within the kit, including sample addition, sample extraction, sample transfer, reagent addition, mixing, incubation reaction, and detection control. It is simple, convenient, stable, reliable, efficient, does not rely on laboratories or professional experimental personnel, and can achieve automated detection, meeting the needs of rapid and accurate pesticide residue detection in agricultural production and food safety fields.

[0005] Patent application number 202121726095.7 discloses a portable food safety testing instrument. The product adopts an integrated box structure, realizing a detachable connection between the upper and lower boxes, which facilitates the overall carrying. Furthermore, the testing function is highly integrated into the lower box, solving the problem that traditional food safety testing instruments are not convenient to carry.

[0006] The enzyme inhibition rate method is a classic national standard method for the detection of organophosphorus and carbamate pesticides in primary agricultural products, widely used in large agricultural wholesale markets and fresh produce distribution companies for product quality control. Due to the large sample size and rapid circulation of fresh primary agricultural products, higher demands are placed on the speed and efficiency of pesticide residue detection.

[0007] However, in recent years, it has been found that the current on-site rapid testing devices for grassroots use often rely on the experimental skills of the on-site rapid testing personnel. Under light detection, at least two reagents are usually added during the detection process, namely cholinesterase and chromogenic substrate, and generally three are added. Moreover, the pesticide residue of multiple products is usually tested simultaneously. Generally, there are at least 18 cuvettes in each of the two light detection modules, which is a lot of work. Therefore, based on the previous research on portable multifunctional food safety detectors (application number 201920115742.7 and application number 201720636678.8), our company has further improved and developed a portable food safety detector that can reduce the intensity of manual operation. Utility Model Content

[0008] The purpose of this invention is to provide an automatic reagent adding device for a portable food safety detector with a dual-rotor optical detection module, which offers faster reagent addition speed, saves manpower, and provides higher stability, as well as a portable food safety detector.

[0009] The technical solution of this utility model is: An automatic reagent adding device for a dual-rotary optical detection module is disclosed for adding reagents to two sets of rotary optical detection modules. The device includes a swing arm module and two or three supply modules. Each supply module includes a reagent bottle connected to the pump inlet via a hose I and a nozzle connected to the pump outlet via a hose II. The swing arm module includes a motor I fixed within a housing and a swing arm. The top end of the drive shaft of motor I is fixedly connected to one end of the swing arm. Several nozzles are disposed on the bottom surface of the other end of the swing arm. Motor I drives the swing arm to rotate around the drive shaft, further rotating the nozzles to a designated position before stopping. Reagents from different reagent bottles are sprayed into cuvettes through hoses I, hoses II, and nozzles via different pumps. After all cuvettes on one turntable have been filled, motor I drives the swing arm to rotate again around the drive shaft to add reagents to cuvettes on the other turntable. The nozzle can be positioned directly inside the cuvette by controlling the rotation position of motor I. For example, the maximum distance that motor I can rotate left and right can be set so that the nozzle is directly inside the cuvette. Furthermore, the pump is a peristaltic pump, a micro-injection pump, or a dosing pump, preferably a peristaltic pump. The amount added can be controlled by changing the inner diameter of the tubing I and tubing II. Furthermore, when it is a liquid addition pump or a peristaltic pump, it also includes a suction needle. The tubing I draws the reagent from the reagent bottle into the tubing I through the suction needle, and then adds it into the cuvette through another tubing II and a nozzle (which is also a suction needle) connected to the front end of the tubing II. The suction needle serves two purposes: first, it connects to the inlet tube (hose I) and the outlet tube (hose II) respectively; second, it fixes the peristaltic tube to prevent it from shifting too much as the peristaltic pump rotates in both directions. Furthermore, each reagent bottle contains one, two, or three tubing I. When multiple tubing I are inserted into each reagent bottle, the reagent bottle can simultaneously supply material to multiple pumps and tubing II. Furthermore, several of the nozzles are equipped with sensors on their edges for detecting the presence of cuvettes below. These sensors can be optical sensors such as laser sensors or infrared reflective photoelectric sensors, preferably infrared reflective photoelectric sensors. The principle is that when the infrared emitter emits infrared light, it encounters a cuvette in its path and is reflected back. This reflected infrared light is detected by the receiver. When no cuvette is present, the receiver receives a strong infrared signal, while when the cuvette approaches the sensor, the received infrared signal becomes weaker.

[0010] Furthermore, a sensing plate is fixed on the drive shaft and positioned above and below the swing arm to detect the position of the swing arm, and position sensors are fixed in the housings on both sides of the swing arm. The pump, motor I, optical sensor, and position sensor are electrically connected to the controller. The optical sensor and position sensor send signals to the controller, and the controller controls the switching and operating status of the pump and motor I. When the position sensor detects that the drive shaft has driven the sensing plate to rotate to the corresponding position, it sends a signal to the controller. After receiving the signal, the controller controls the motor I to stop rotating. At this time, the optical sensor transmits a signal to the controller indicating whether there is a cuvette below. When there is a cuvette, the peristaltic pump is turned on to add reagent to the cuvette. When there is no cuvette, the pump is not started to avoid adding reagent to the cuvette groove. That is, the reagent adding program is not started to avoid adding reagent to the instrument's cuvette groove.

[0011] Furthermore, the automatic reagent adding device is installed on the housing of the portable food safety testing instrument. The top of the drive shaft of motor I passes through the housing and is fixedly connected to one end of the swing arm. The sensing plate and two position sensors are all installed inside the housing. The position sensors are fixed to the inner wall of the housing by a bracket. When the position sensor senses the position of the sensing plate, the nozzle is aligned with the receiving cavity inside the cuvette. The housing at the bottom of the swing arm is provided with an annular scale with the drive shaft as the center point. The outer circumference of the pump is fixed with a square fixing plate for fixing the position of the pump. The top surface of the housing has a hollowed-out part that penetrates the top surface of the housing. The lower part of the pump is inserted into the housing through the hollowed-out part. After the fixing plate is snapped into the top surface of the housing, the two are fixed by screws. The mounting box with a recessed groove is fastened to the pump. The top surface of the mounting box is connected to the cover plate I by a hinge. The cover plate I is located directly above the pump. The upper end of the pump is restricted between the mounting box, the cover plate I, and the top surface of the housing. The pump can be inspected or removed and replaced by removing the fixing plate from the housing. The upper part of the mounting box has several recessed grooves for embedding reagent bottles. The mounting box between the embedding groove and the pump has a through hole for hose I and hose II to pass through. The cover plate II is connected to the mounting box by a hinge and covers the embedding groove, the through hole, the reagent bottle, hose I, and hose II. After the nozzle is fixed on the swing arm and the hose II is connected to the nozzle, the fastening box is fastened on the swing arm and the two are connected by screws; A portable food safety testing instrument includes a housing and a lid. The housing is equipped with an automatic reagent adding device and two sets of optical detection modules. The automatic reagent adding device is embedded in the housing of the portable food safety testing instrument. The optical detection modules include two sets of turntables, a light source plate disposed on the outer circumference of the turntables and fixed inside the housing for emitting light sources of different wavelengths, two drive components that drive the two sets of turntables to rotate, a plurality of square grooves arranged circumferentially on the turntables, a heating module corresponding one-to-one with the positions of the plurality of grooves for heating cuvettes in the grooves, and a receiver disposed on the central axis inside the turntables. The heating module includes an annular heating plate disposed at the bottom of the turntable. The annular heating plate is connected to a thermostat at its bottom for controlling the temperature of the heating plate. The thermostat is connected to a controller, and the controller controls the temperature value of the thermostat. The optical sensor or photoelectric sensor includes a light source board, a light source mounting base, a transmitter, a receiver, and a signal processing circuit; Furthermore, the light source board is responsible for emitting light sources of different wavelengths as required. Each groove contains a cuvette, and each groove has a light-passing hole on its side near the bottom for the light source to pass through. The light source board is mounted on a light source mounting base. The light source emitted by the light source board, the light-passing hole, and the receiver are in a straight line. The light enters through the light-passing hole, passes through the cuvette, and is received by the receiver. The light signal is converted into a measurable electrical signal through the photoelectric effect. The signal processing circuit amplifies, filters, compares, and other processes the electrical signal, and finally outputs an electrical signal for judging object information, which is sent to the controller through the transmitter.

[0012] The driving component is a stepper motor, which provides rotational power and angular positioning to the turntable, enabling the reagents in the cuvette to be shaken and mixed, incubated, and accurately positioned relative to the automatic reagent adding device. The number of rotations of the driving component is consistent with the number of grooves, so that after the grooves return to their original positions after one rotation, reagents are added to the cuvettes in each groove except for one blank group. Because multiple pumps are provided, multiple reagents can be added to a cuvette separately and simultaneously. Furthermore, each of the two sets of turntables is equipped with a zero-position switch at its bottom. The zero-position switch includes a contact I that rotates with the turntable and two fixed contacts II inside the housing. The contacts II are positioned vertically above and below the position sensor. When the position sensor detects that the drive shaft has driven the sensing plate to rotate to the corresponding position, i.e., the starting point, it sends a signal to the controller. After receiving the signal, the controller controls the motor I to stop rotating. At this time, it is insufficient to maintain the separation of contacts I and II. The effect of centrifugal force weakens, and contacts I and II will close under the action of the spring, thereby triggering a signal change in the circuit to achieve zero-speed detection. At this time, the drive assembly no longer rotates. Furthermore, the number of grooves on a single turntable can be 8, 12, 18, 36, or 48, preferably 18; Furthermore, the turntable is covered with a detachable cover. During testing, the cover is fastened to the center hole of the turntable to prevent other impurities, dust, etc. from entering the cuvette. The detachable method is achieved by providing screw holes on the turntable and fixing the cover to the turntable with screws. Furthermore, the lid and body are connected by hinges, ensuring an internal seal when the lid is closed. The exterior of the box features a buckle and a handle. The body also includes a cooling fan, speaker, communication device, printer, power button, power socket for charging the battery, and a colloidal gold module. The interior houses a battery to power the portable food safety testing instrument and a controller for operating the device. A liquid crystal display screen is located on the surface where the lid and body meet; preferably, a 12-inch or larger high-definition touchscreen, a highly integrated Windows-based industrial computer, a miniature thermal printer, and the communication device are used, with centralized control and management by the highly integrated industrial computer. The communication device includes an external USB interface, Ethernet, SD card slot, Bluetooth, WiFi, and GPS positioning device for convenient communication with external intelligent systems. The communication device controls the WiFi, Bluetooth, Ethernet, USB, SD card slot, network interface, and serial port for command or data transmission. It can locate and upload detection positions and directly connect to a server. Detection data can be permanently saved, copied, printed, and uploaded.

[0013] Furthermore, the colloidal gold detection device is designed with a dual-channel parallel detection structure, with two stepper motors controlling two detection channels respectively. This is mainly used to enable arbitrary switching between single-channel independent detection and dual-channel simultaneous detection modes, thereby improving detection efficiency.

[0014] The advantages and positive effects of this utility model are: 1. The automatic reagent dispensing device is mainly used for the automatic addition of reagents in the pesticide residue detection process. This device is used to automatically add reagents to a dual-rotor optical detection module. Motor I drives the swing arm to rotate around the drive shaft, further rotating the nozzle to a designated position before stopping. Different pumps then spray reagents from different reagent bottles into the cuvettes through hoses I and II and the nozzle. Once all cuvettes on one turntable have been added, motor I drives the swing arm to rotate again around the drive shaft to add reagents to the cuvettes on the other turntable. Therefore, this device can automatically complete the addition of reagents to two different turntables. The turntable accommodates 36 (or more) cuvettes for reagent addition, reducing manual operation and thus saving manpower while increasing speed. Motor I can be manually controlled by switching it on and off; when motor I swings above a set of cuvettes on the turntable, it is turned off and stops rotating. The turntable then rotates to receive the reagent in the cuvettes. Alternatively, the nozzle can be positioned precisely within the cuvette by controlling the rotation of motor I. For example, the maximum left-right rotation distance of motor I can be set, ensuring the nozzle is directly inside the cuvette; or the angle of left-right swing can be limited by setting a limit block. The amount of reagent added can be controlled manually or by turning the pump on and off via a controller, or by changing different diameter tubing I and tubing II.

[0015] 2. To further improve the level of automation, an optical sensor is installed to automatically detect whether there is a cuvette below. Reagents will only be added if a cuvette is present, thus avoiding damage to the instrument when reagents are added without a cuvette.

[0016] Later, a drop sensor can be installed on the edge of the optical sensor to detect the drop status of the reagent and related parameters.

[0017] 3. To further improve the level of automation, a sensor plate is fixed on the drive shaft to detect the position of the swing arm. Position sensors are fixed in the boxes on both sides of the swing arm. Therefore, the position of the swing arm rotation can be detected and the swing arm can be controlled to stop rotating (automatically stop rotating) and reach the appropriate position, so that the peristaltic pump can be turned on to add reagents to the cuvette. Of course, the swing position of motor I can also be manually controlled and the controller can be sent a command through the touch screen to control motor I to stop rotating.

[0018] By controlling the frequency and timing of reagent addition via the peristaltic pump, the total amount of reagent added to each cuvette can be precisely controlled, resulting in a high degree of automation and saving manpower.

[0019] 4. The circular dial makes it easy to observe whether the rotation position of motor I is appropriate.

[0020] 5. The supply module is fixed to the housing via the mounting box, making it easy to carry when traveling. Internal parts remain in place, facilitating future maintenance, replacement, and disassembly. When the nozzle is fixed to the swing arm and hose II is connected to the nozzle, the fastening box is fastened to the swing arm, and the two are connected by screws. This prevents accidental movement of hoses II and I, and the overall design is more aesthetically pleasing and structurally stable.

[0021] 6. The inclusion of two sets of photodetector modules facilitates the simultaneous detection of more samples and allows for easy comparison. The use of photodetector and colloidal gold detection methods makes the detection process simple and rapid.

[0022] 7. This device consists of a box and a lid. The lid can be snapped shut, and the box is equipped with a handle, making it easy to carry and convenient for on-site testing.

[0023] 8. By setting the zero-position switch, it indicates that the turntable has rotated one full turn and returned to the origin, so you can stop adding reagents.

[0024] 9. This product features centralized control and management via a highly integrated industrial control computer. Communication devices include external USB, Ethernet, SD card slot, Bluetooth, WiFi, and GPS positioning, facilitating communication with external intelligent systems. The control and communication devices (WiFi, Bluetooth, Ethernet, USB, SD card slot, network interface, and serial port) transmit commands and data, enabling location tracking and uploading of detected data, and direct connection to a server. It can permanently save, copy, print, and upload detection data.

[0025] 10. This product offers high throughput, faster speed, more stable liquid addition, greater portability in the field, lower cost, and easier operation for grassroots users. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an automatic reagent adding device.

[0027] Figure 2 This is a top-view schematic diagram of the automatic reagent dispensing device with the snap-fit ​​box hidden.

[0028] Figure 3 This is a bottom-view diagram showing the automatic reagent dispensing device with the snap-fit ​​box hidden.

[0029] Figure 4 This is a schematic diagram of an automatic reagent dispensing device with cover plate I, cover plate I, and the connecting box fastened.

[0030] Figure 5 This is a bottom view of a dual-rotor optical detection module and an automatic reagent dispensing device. Figure 6 This is a schematic diagram of contact I and contact II; Figure 7 This is a top view schematic diagram of a dual-rotor optical detection module and an automatic reagent dispensing device; Figure 8 This is a schematic diagram of a portable food safety testing instrument.

[0031] In the picture: 1. Pump; 2. Hose I; 3. Reagent bottle; 4. Hose II; 5. Nozzle; 6. Motor I; 7. Swing arm; 8. Cuvette; 9. Drive shaft; 10. Optical sensor; 11. Sensing plate; 12. Position sensor; 13. Housing; 14. Fixing plate; 15. Mounting box; 16. Cover I; 17. Embedded groove; 18. Cover II; 19. Snap-fit ​​box; 20. Box cover; 21. Turntable; 22. Light source board; 23. Drive assembly; 24. Groove; 25. Receiver; 26. Light transmission hole; 27. Contact I; 28. Contact II; 29. ​​Cover; 30. Cooling fan; 31. Colloidal gold module. Detailed Implementation

[0032] This testing instrument is a further development based on application number 201920115742.7, entitled "Portable Multifunctional Food Safety Testing Instrument" and application number 201720636678.8, entitled "Portable Multifunctional Food Safety Testing Instrument". The functions and effects of the parts mentioned in this product but specifically described are as described in the above patents.

[0033] This embodiment describes a portable food safety testing instrument.

[0034] like Figure 8 As shown, the enclosure includes the box body 13 and the box cover 20. The box body 13 is equipped with an automatic reagent dispensing device and two sets of optical detection modules. The automatic reagent dispensing device, the optical detection modules, and other modules will be described separately below.

[0035] 1. The automatic reagent adding device

[0036] like Figures 1-5As shown, the automatic reagent dispensing device is embedded in the housing 13 of the portable food safety testing instrument, including a swing arm 7 module and two supply modules. The supply module includes a reagent bottle 3 connected to the inlet of the peristaltic pump 1 via a hose I2, and a nozzle 5 connected to the outlet of the peristaltic pump 1 via a hose II4. The hose I2 draws in the reagent through a suction needle. The swing arm 7 module includes a motor I6 fixed inside the housing 13 and a swing arm 7. The top end of the drive shaft 9 of the motor I6 is fixedly connected to one end of the swing arm 7. The two nozzles... The head 5 is located on the bottom surface of the other end of the swing arm 7. The motor I6 drives the swing arm 7 to rotate around the transmission shaft 9, and further drives the nozzle 5 to rotate to the designated position and then stop rotating. The different peristaltic pumps 1 spray the reagents in the different reagent bottles 3 into the cuvettes 8 through the hose I2, hose II4 and nozzle 5. When all the cuvettes 8 on one turntable 21 have been added, the motor I6 drives the swing arm 7 to rotate again around the transmission shaft 9 to add reagents to the cuvettes 8 on another set of turntables 21. Furthermore, several of the nozzles 5 are equipped with optical sensors 10 on their edges for detecting the presence of cuvettes below. These sensors are further classified as infrared reflective photoelectric sensors. The principle is that when the infrared emitter emits infrared light, it encounters a cuvette in its path and is reflected back. This reflected infrared light is detected by the receiver. When no cuvette is present, the receiver receives a strong infrared signal, while when the cuvette approaches the sensor, the received infrared signal becomes weaker.

[0037] Furthermore, a sensing plate 11 is fixed on the drive shaft 9 and is arranged vertically with the swing arm 7 to detect the position of the swing arm 7. Position sensors 12 are fixed in the housings 13 on both sides of the swing arm 7. The peristaltic pump 1, motor I6, optical sensor 10, and position sensor 12 are electrically connected to the controller. The optical sensor 10 and position sensor 12 send signals to the controller, and the controller controls the switching and operating status of the pump 1 and motor I6. When the position sensor 12 can detect that the transmission shaft 9 drives the sensing plate 11 to rotate to the corresponding position, it sends a signal to the controller. After receiving the signal, the controller controls the motor I6 to stop rotating. At this time, the optical sensor transmits a signal to the controller whether there is a cuvette below. When there is a cuvette, the peristaltic pump 1 is turned on to add reagent to the cuvette 8. When there is no cuvette 8, the peristaltic pump 1 is not started to avoid adding reagent to the instrument cuvette tank 24.

[0038] Furthermore, the automatic reagent addition device is installed on the housing 13 of the portable food safety testing instrument. The top end of the drive shaft 9 of the motor I6 passes through the housing 13 and is fixedly connected to one end of the swing arm 7. The sensing plate 11 and two position sensors 12 are all installed inside the housing 13. The position sensor 12 is fixed to the inner wall of the housing 13 by a bracket. When the position sensor 12 senses the position of the sensing plate 11, the nozzle 5 is aligned with the receiving cavity inside the cuvette 8. The housing 13 at the bottom of the swing arm 7 is provided with an annular scale with the drive shaft 9 as the center point. The peristaltic pump 1 has a square fixing plate 14 fixed to its position on its outer peripheral surface. The top surface of the housing 13 has a hollowed-out portion that penetrates the top surface of the housing 13. The lower part of the pump 1 is inserted into the housing 13 through the hollowed-out portion. After the fixing plate 14 is snapped into the top surface of the housing 13, the two are fixed by screws. The mounting box 15, which has a recessed groove inside, is fastened onto the pump 1. The top surface of the mounting box 15 is connected to the cover plate I 16 by a hinge. The cover plate I 16 is located directly above the pump 1, so the upper end of the pump 1 is restricted within the mounting box 15. Between the cover plate I16 and the top surface of the box 13, the pump 1 can be inspected or replaced by removing the fixing piece 14 from the box 13 after opening the cover plate I16; the upper part of the mounting box 15 is provided with several recessed grooves 17 for embedding reagent bottles 3. The mounting box 15 between the grooves 17 and the pump 1 is provided with perforations for hoses I2 and II4 to pass through. The cover plate II18 is connected to the mounting box 15 by a hinge and covers the grooves 17, perforations, reagent bottles 3, hoses I2 and II4. When the nozzle 5 is fixed on the swing arm 7 and the hose II4 is connected to the nozzle 5, the fastening box 19 is fastened on the swing arm 7 and the two are connected by screws.

[0039] 2. Optical detection module

[0040] like Figures 6-7 As shown, the optical detection module includes two sets of turntables 21, a light source plate 22 disposed on the outer circumference of the turntables 21 and fixed inside the housing 13 for emitting light sources of different wavelengths, two drive components 23 that drive the two sets of turntables 21 to rotate respectively, a plurality of square grooves 24 disposed circumferentially on the turntables 21, a heating module that corresponds one-to-one with the positions of the plurality of grooves 24 and is used to heat the cuvettes 8 inside the grooves 24, and a receiver 25 disposed on the central axis inside the turntables 21. The heating module includes an annular heating plate disposed at the bottom of the turntable 21. The annular heating plate is connected to a thermostat at its bottom for controlling the temperature of the heating plate. The thermostat is connected to a controller, and the controller controls the temperature value of the thermostat. The optical sensor or photoelectric sensor includes a light source board 22, a light source mounting base, a transmitter, a receiver 25, and a signal processing circuit. The optical sensor 10, position sensor 12, light sensor or photoelectric sensor, stepper motor, zero-position switch and other components are all purchased from the market.

[0041] Furthermore, the light source plate 22 is responsible for emitting light sources of different wavelengths as required. Each groove 24 is equipped with a cuvette 8. Each groove 24 has a light-passing hole 26 on its side near the bottom for the light source to pass through. The light source plate 22 is mounted on the light source mounting base. The light source emitted by the light source plate 22, the light-passing hole 26, and the receiver 25 are in a straight line. The light enters through the light-passing hole 26, passes through the cuvette 8, and is received by the receiver 25. The light signal is converted into a measurable electrical signal through the photoelectric effect. The signal processing circuit amplifies, filters, compares, and processes the electrical signal, and finally outputs an electrical signal for judging object information, which is sent to the controller through the transmitter.

[0042] The driving component 23 is a stepper motor, which provides rotational power and angular positioning to the turntable 21, realizing the shaking and mixing of reagents in the cuvette 8, the incubation operation, and the accurate positioning relative to the automatic reagent adding device. The number of rotations of the driving component 23 is consistent with the number of grooves 24, so that after the groove 24 rotates one revolution and returns to its original position, reagents are added to the cuvette 8 in each of the grooves 24 except for one blank group. Because multiple pumps 1 are provided, multiple reagents can be added to one cuvette 8 separately and simultaneously. Furthermore, each of the two sets of turntables 21 is provided with a zero-position switch at its bottom. The zero-position switch includes a contact I 27 that rotates with the turntable 21 and two fixed contacts II 28 inside the housing 13. The contacts II 28 are arranged vertically above the position sensor 12. When the position sensor 12 can detect that the drive shaft 9 drives the sensing plate 11 to rotate to the corresponding position, i.e. the starting point, it sends a signal to the controller. After receiving the signal, the controller controls the motor I 6 to stop rotating. At this time, it is not enough to maintain the separation of contacts I 27 and contacts II 28. The effect of centrifugal force weakens, and contacts I 27 and contacts II 28 will close under the action of the spring, thereby triggering a signal change in the circuit to achieve zero speed detection. At this time, the drive assembly 23 no longer continues to rotate. The number of grooves 24 on a single turntable 21 is 18; Furthermore, such as Figure 7As shown, a detachable cover 29 is provided above the turntable 21. In the testing situation, the cover 29 is fastened to the central hole of the turntable 21 to prevent other impurities, dust and other contaminants from entering the cuvette 8. The detachable method is achieved by setting screw holes on the turntable 21 and fixing the cover 29 to the turntable 21 with screws. Furthermore, the optical detection module is similar in principle to the original optical sensor, for details please refer to 201920115742.7 Portable Multifunctional Food Safety Detector.

[0043] 3. Other modules

[0044] In addition to the aforementioned components, the lid 20 and the body 13 are connected by hinges. When the lid 20 is closed, the interior is sealed. The body 13 is equipped with a buckle and a handle. The body 13 also includes a cooling fan 3130, a speaker, a communication device, a printer, a power button, a power socket for charging the battery, and a colloidal gold module. Inside the body 13 is a battery that provides power to the portable food safety testing instrument and a controller for controlling the device. A liquid crystal display screen is located on the surface where the lid 20 and body 13 are fastened. Preferably, a 12-inch or larger high-definition touchscreen, a Windows-based highly integrated industrial control computer, a miniature thermal printer, and a communication device are used, with centralized control and management by the highly integrated industrial control computer. The communication device includes an external USB interface, Ethernet, SD card interface, Bluetooth, WiFi, and GPS positioning device for convenient communication with external intelligent systems. The WiFi, Bluetooth, Ethernet, USB, SD card slot, network interface, and serial port in the communication device are used for command or data transmission. It can locate and upload detection data, and can directly connect to the server. It can permanently save the detected data, and provides copy, print, and upload services.

[0045] Furthermore, the structure and function of the colloidal gold detection module can be found in application number 201720701331.7, entitled "A Portable Comprehensive Food Safety Analysis Device". Specific modules such as the controller, high-definition touchscreen, Windows system, miniature thermal printer, and communication device are not the focus of this improvement. This application is based on existing technology and further development of application number 201920115742.7, entitled "A Portable Multifunctional Food Safety Detector," therefore they are not listed individually. For specific structures and functions, please refer to 201720701331.7 "A Portable Comprehensive Food Safety Analysis Device", 201920115742.7 "A Portable Multifunctional Food Safety Detector", and 202211570903.4 "An Integrated Standardized Rapid Detection Device and Method for Pesticide Residues".

[0046] Furthermore, the colloidal gold detection device is designed with a dual-channel parallel detection structure, with two stepper motors controlling two detection channels respectively. This is mainly used to enable arbitrary switching between single-channel independent detection and dual-channel simultaneous detection modes, thereby improving detection efficiency.

[0047] The usage procedure for this product is as follows: After connecting to an external power source, press the power switch button in the upper right corner of the instrument to enter the login interface; after powering on and logging into the testing interface, the instrument will prompt "Please insert cuvette 8" - "Please ensure that an empty cuvette 8 is placed in the first channel of the left disk," then click OK. After filling is complete, it will prompt you to remove cuvette 8. An error message will appear if filling fails; you can manually click to continue until pre-filling is successful.

[0048] The pesticide residue detection sampling process is as follows: When the user conducts sample testing, place cuvette 8 containing 2.0 ml of buffer solution (control solution) in channel 1, and then place cuvette 8 containing the sample to be tested in other detection channels (channels 2-18) in sequence. (After sample extraction, transfer the extract to cuvette 8. The standard recommended sample volume is 2.0 ml, which can be adjusted as needed.)

[0049] The second part is that the controller controls the motor I6 to drive the swing arm 7 to rotate around the transmission shaft 9, and further drives the nozzle 5 to rotate to the designated position and then stop rotating.

[0050] The drive assembly 23 drives the turntable 21 to rotate, aligning both nozzles 5 with the second cuvette 8 (this is because the first cuvette 8 is a blank control group and no reagent is added). The two peristaltic pumps 1 simultaneously spray cholinesterase and the chromogenic substrate into the second cuvette 8 through two sets of tubing I2, tubing II4, and nozzles 5. During this process, the total amount of reagent added to each cuvette 8 can be precisely controlled by adjusting the automatic reagent addition frequency and time of the peristaltic pumps 1. After the first cuvette 8 on the first turntable 21 has been filled, the drive assembly 23 drives the turntable 21 to rotate. At this time, both nozzles 5 are aligned with the third cuvette 8, and reagent is added. This process continues until all cuvettes have been filled.

[0051] Once all the cuvettes 8 on one turntable 21 have been added, motor I6 drives the swing arm 7 to rotate again around the transmission shaft 9 to add reagents to the cuvettes 8 on another set of turntables 21. After the addition is completed, the drive component 23 provides rotational power and angular positioning to the turntable 21, so as to realize the shaking and mixing of reagents in the cuvette 8, the incubation operation, and then the detection.

[0052] At this time, the light source plate 22 is responsible for emitting light sources of different wavelengths as required. Each groove 24 is equipped with a cuvette 8. The side of each groove 24 near the bottom of the groove 24 is provided with a light-passing hole 26 for the light source to pass through. The light source plate 22 is mounted on the light source mounting base. The light source emitted by the light source plate 22, the light-passing hole 26, and the receiver 25 are in a straight line. The light enters from the light-passing hole 26, passes through the cuvette 8, and is received by the receiver 25. The light signal is converted into a measurable electrical signal through the photoelectric effect. The signal processing circuit amplifies, filters, compares, and processes the electrical signal, and finally outputs an electrical signal for judging object information, which is sent to the controller through the transmitter.

[0053] In addition, this device can also perform colloidal gold detection. The detection process and method are described in references 201720701331.7 A portable food safety comprehensive analysis device and 201920115742.7 Portable multifunctional food safety detector.

[0054] After the testing process is completed, a results summary will be displayed on the right side of the main interface, reporting the enzyme inhibition rate, absorbance changes, and positive results for each sample. Positive results will be highlighted in red text.

[0055] The pump can be controlled independently via software to inject and drain liquid from the pipeline, ensuring accurate liquid addition and pipeline emptying and cleaning after the experiment by using a fixed pipe diameter and a fixed number of rotations.

[0056] It should be noted that this device is not limited to the circular layout described above. It can also be a linear layout with linear movement or other layouts. At the same time, the structure of the automatic reagent adding device can be adjusted, and the principle of adding reagents remains the same.

[0057] This device is a multi-channel detection instrument that fully complies with the national standard GB / T 5009.199 for enzyme inhibition rate method detection. The instrument completely automates the manual reagent addition, timing, and incubation steps required in the national standard. It uses standard-sized cuvettes (8-inch) as the sample reaction and detection carrier, and integrates temperature control, enabling accurate sample detection under various ambient temperatures. The instrument contains two reagent storage bottles, automatically and accurately adding reagents and automatically mixing samples. Different reagents are added independently, eliminating the need for frequent tubing cleaning and the risk of cross-contamination. Users can automatically complete the simultaneous detection of multiple samples with a single button operation. The instrument can be widely used by government regulatory departments, farmers' markets, supermarkets, school canteens, third-party laboratories, and other institutions for efficient and rapid screening and detection of pesticide residues in food.

[0058] Applicable test reagents: All pesticide residue test reagents (including enzyme reagents, chromogenic agents and substrates) supporting the enzyme inhibition rate method in GB / T 5009.199 are applicable.

[0059] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A dual-rotating disk optical detection module reagent automatic adding device, characterized in that: This device is used to add reagents to two sets of rotary optical detection modules. It includes a swing arm module and two or three supply modules. The supply module includes a reagent bottle connected to the pump inlet via hose I and a nozzle connected to the pump outlet via hose II. The swing arm module includes a motor I and a swing arm fixed inside the housing. The top of the drive shaft of motor I is fixedly connected to one end of the swing arm. Several nozzles are disposed on the bottom surface of the other end of the swing arm. Motor I drives the swing arm to rotate around the drive shaft, and further drives the nozzles to rotate to a designated position and then stop rotating. Reagents from different reagent bottles are sprayed into cuvettes through hoses I, hoses II, and nozzles via different pumps. When all cuvettes on one set of rotary disks have been added, motor I drives the swing arm to rotate again around the drive shaft to add reagents to the cuvettes on the other set of rotary disks. ​ 2.The dual-rotating disk optical detection module reagent automatic adding device according to claim 1, wherein: The pump is a peristaltic pump, a micro-injection pump, or a dosing pump; the dosage is controlled by changing hoses I and II with different inner diameters; when it is a dosing pump or a peristaltic pump, it also includes a suction needle, through which the reagent in the reagent bottle is drawn into hose I; Each reagent bottle contains one, two, or three tubing I. When multiple tubing I are inserted into each reagent bottle, the reagent bottle can simultaneously supply material to multiple pumps and tubing II. Several nozzles are equipped with sensors on their edges to detect whether there is a cuvette below. These sensors are either laser sensors or infrared reflective photoelectric sensors, which are optical sensors. A sensing plate, positioned above and below the swing arm to indicate its position, is fixed on the drive shaft. Position sensors are fixed inside the housings on both sides of the swing arm. The pump, motor I, infrared reflective photoelectric sensor, and position sensors are electrically connected to a controller. The infrared reflective photoelectric sensor and position sensors send signals to the controller, which controls the switching and operating status of the pump and motor I. When the position sensor detects that the drive shaft has rotated the sensing plate to the corresponding position, it sends a signal to the controller. Upon receiving the signal, the controller stops motor I. At this time, the optical sensor transmits a signal to the controller indicating whether there is a cuvette below. If there is a cuvette, the peristaltic pump is activated to add reagent to the cuvette. If there is no cuvette, the pump is not activated to prevent reagent from being added to the groove where no cuvette is present.

3. The automatic reagent adding device for a dual-rotor optical detection module according to claim 2, characterized in that: The automatic reagent addition device is installed on the housing of the portable food safety testing instrument. The top of the drive shaft of motor I passes through the housing and is fixedly connected to one end of the swing arm. The sensing plate and two position sensors are all installed inside the housing. The position sensors are fixed to the inner wall of the housing by a bracket. When the position sensor senses the position of the sensing plate, the nozzle is aligned with the receiving cavity inside the cuvette. 4.The dual-rotating disk optical detection module reagent automatic adding device according to claim 2 or 3, characterized in that: The outer circumference of the pump is fixed with a square fixing plate for fixing the position of the pump. The top surface of the housing has a hollowed-out part that penetrates the top surface of the housing. The lower part of the pump is inserted into the housing through the hollowed-out part. After the fixing plate is snapped into the top surface of the housing, the two are fixed by screws. The mounting box with a recessed groove is fastened to the pump. The top surface of the mounting box is connected to the cover plate I by a hinge. The cover plate I is located directly above the pump, so the upper end of the pump is restricted between the mounting box, the cover plate I, and the top surface of the housing. The upper part of the mounting box has several recessed grooves for embedding reagent bottles. The mounting box between the embedding groove and the pump has a through hole for hose I and hose II to pass through. The cover plate II is connected to the mounting box by a hinge and covers the embedding groove, the through hole, the reagent bottle, hose I, and hose II.

5. The dual-rotating disk optical probe detection module reagent automatic adding device according to claim 1, characterized in that: After the nozzle is fixed on the swing arm and the hose II is connected to the nozzle, the fastening box is fastened on the swing arm and the two are connected by screws.

6. A portable food safety testing instrument, comprising the aforementioned housing and lid, characterized in that: The housing is equipped with an automatic reagent adding device for a dual-rotor type optical detection module as described in claim 1, 2, 3, or 5, and two sets of optical detection modules. The automatic reagent adding device for the dual-rotor type optical detection module is embedded in the housing of the portable food safety detector. The optical detection module includes two sets of rotating disks, a light source plate disposed on the outer circumference of the rotating disks and fixed inside the housing for emitting light sources of different wavelengths, two drive components that drive the two sets of rotating disks to rotate respectively, a plurality of square grooves disposed circumferentially on the rotating disks, a heating module that corresponds one-to-one with the positions of the plurality of grooves and is used to heat the cuvettes in the grooves, and a receiver disposed on the central axis inside the rotating disks. The light source plate emits light sources of different wavelengths. Each groove contains a cuvette. Each groove has a light-passing hole on its side near the bottom for the light source to pass through. The light source plate is mounted on a light source mounting base. The light source emitted by the light source plate, the light-passing hole, and the receiver are in a straight line. The light enters through the light-passing hole, passes through the cuvette, and is received by the receiver.

7. The portable food safety detector of claim 6, wherein: The number of rotations of the drive component is the same as the number of grooves.

8. The portable food safety detector of claim 6, wherein: The heating module includes an annular heating plate disposed at the bottom of the turntable, the annular heating plate being connected to a temperature controller at its bottom for controlling the temperature of the heating plate, and the temperature controller being connected to a controller. A light sensor or photoelectric sensor includes a light source board, a light source mounting base, a transmitter, a receiver, and a signal processing circuit.

9. A portable food safety testing instrument according to claim 8, characterized in that: Each of the two sets of turntables has a zero-position switch at its bottom. The zero-position switch includes a contact I that rotates with the turntable and two fixed contacts II inside the housing. The contacts II are positioned vertically above and below the position sensor. When the position sensor detects that the drive shaft has driven the sensing plate to rotate to the corresponding position, i.e., the starting point, it sends a signal to the controller. After receiving the signal, the controller controls the motor I to stop rotating. At this time, it is not enough to keep the contacts I and II separated. The effect of centrifugal force weakens, and the contacts I and II will close under the action of the spring, thereby triggering a signal change in the circuit. At this time, the drive assembly stops rotating.

10. A portable food safety testing instrument according to claim 6, characterized in that: The upper cover of the rotary disc is provided with a detachable cover body, which is buckled on the center hole of the rotary disc in the detection case.

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