Device for rapidly detecting freshness of animal-derived food

Abstract

The invention relates to the technical field of food detection, in particular to an animal-derived food freshness rapid detection device which comprises a shell, a shielding assembly and a receiving assembly are further arranged in the shell, the shielding assembly is used for spraying fluid to the outside to form a barrier, and the receiving assembly is used for collecting volatile amino nitrogen generated by target food; the control system is used for controlling the shielding assembly to adjust the position of the barrier according to the position of the target food, and controlling the shielding assembly to adjust the coverage area of the barrier according to the size of the target food after the barrier is located at the central position of the target food in the image information; according to the method, the content of the volatile amino nitrogen in the receiving assembly in unit time is obtained, and the content of the volatile amino nitrogen in the target food is calculated in combination with the size of the target food, so that the food freshness detection speed is increased, meanwhile, the operation steps of food freshness detection are reduced, and the detection efficiency is improved. Therefore, the requirements of a food freshness detection technology on professional quality of operators are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of food detection, and in particular to a device for quickly detecting the freshness of animal-derived food. Background Art

[0002] Animal-source foods such as seafood, fish and poultry, as an indispensable and important part of people's dietary structure, carry rich nutritional value and unique flavor experience.

[0003] Seafood, as a gift from the ocean, is deeply loved by consumers for its fresh and smooth taste and rich mineral and vitamin content. They are not only rich in protein, but also rich in trace elements beneficial to the human body, such as iodine, zinc, selenium, etc., which play an important role in maintaining normal physiological functions of the human body and promoting growth and development. However, seafood is prone to spoilage due to changes in environmental conditions during storage and transportation.

[0004] Fish is also highly regarded for its high protein and low fat content. They are rich in unsaturated fatty acids, which help reduce the risk of cardiovascular disease and are an important part of a healthy diet. However, fish spoilage is also a problem that cannot be ignored. During storage and transportation, the quality of fish is easily degraded due to the action of enzymes and microorganisms, and even harmful substances are produced, posing a threat to consumers' health.

[0005] Poultry foods, such as chicken and duck, also occupy an important position on people's tables. They are not only delicious, but also rich in protein, vitamins, minerals and other nutrients, which help to enhance human immunity and promote growth and development. However, poultry foods are also susceptible to microbial contamination during processing and storage, resulting in quality degradation and food safety issues.

[0006] Therefore, for animal-derived foods such as seafood, fish and poultry, the freshness detection technology during storage and transportation is particularly important. Through scientific detection technology, unqualified products can be discovered and handled in a timely manner to ensure the quality and safety of food, maintain market order, and protect the health rights and interests of consumers. At the same time, this also provides strong support for the supervision and development of the food industry and promotes the smooth progress of international trade. The index commonly used to judge the freshness of food is the content of volatile amino nitrogen. In the prior art, the schemes for detecting the volatile amino nitrogen content of food mainly include titration, photochemistry and electrochemistry. However, the above schemes have complicated operation steps and require high professional quality of operators, which is not conducive to the promotion and use of technology. At the same time, the titration method often requires sampling of food, which is very easy to increase the economic losses in the detection process when facing some high-priced foods. However, the photochemical or electrochemical schemes have large detection equipment volumes and limited applicable scenarios. Summary of the invention

[0007] To solve the above problems, the present invention provides a rapid freshness detection device for animal-derived food, which is used to speed up the food freshness detection speed and reduce the operating steps of food freshness detection, thereby reducing the requirements of food freshness detection technology on the professional quality of operators.

[0008] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a device for rapid detection of the freshness of animal-derived food, comprising a shell, a test component and a communication module are arranged in the shell, a shielding component and a receiving component are also arranged in the shell, the shielding component is used to spray fluid to the outside to form an air barrier, the receiving component is used to collect volatile amino nitrogen generated by the target food, and the testing component is used to detect the volatile amino nitrogen content inside the receiving component; it also includes a control system, the control system is used to receive target information input by a user and collect image information around the shell, and obtain the size and position of the target food in the target information according to the image information, control the shielding component to adjust the inclination position of the air barrier according to the position of the target food, and when the air barrier is located at the center of the target food, control the shielding component to adjust the coverage area of ​​the barrier according to the size of the target food until the barrier isolates the target food from the non-target food, obtain the content of volatile amino nitrogen in the receiving component per unit time, and calculate the volatile amino nitrogen content of the target food in combination with the volume of the target food, and control the communication module to output the volatile amino nitrogen content to the user.

[0009] Furthermore, the shielding component includes a first pump component and a plurality of strip holes opened on the outer shell, the first pump component is connected to a plurality of channels, and a throttle valve is provided at one end of the first pump component connected to the channel, the other end of the channel is connected to the adjacent strip holes, an adjusting tube is provided in the channel, the adjusting tube is floatingly installed in the channel, the cross-section of the adjusting tube is trapezoidal, and the side walls of the adjusting tube are slidably matched with the channel, and a connecting plate of elastic material is fixedly connected to one end of the adjusting tube close to the inside of the channel, and an opening is provided on the connecting plate on the side away from the center point of the side wall of the outer shell where the strip holes are provided, and the control system is used to control the operation of the first pump component and the throttle valve according to the volume and position of the target food.

[0010] Furthermore, the receiving assembly includes a collecting hole opened on the side wall of the shell near the strip hole, the collecting hole is connected to the compression chamber, a rotating rod is rotatably connected in the compression chamber, and a limiting assembly is provided on the rotating rod; the limiting assembly is used to limit the unidirectional rotation of the rotating rod, a plurality of compression plates are slidably matched with the bottom of the compression chamber, the compression plates are evenly distributed along the circumference of the rotating rod, the bottom and top of the compression plates are respectively against the bottom and top of the compression chamber, a spring is fixedly connected to the side wall of the compression plate, the end of the spring away from the compression plate is fixedly connected to the rotating rod, the side wall of the compression plate opposite to the spring is fixedly connected to the first sealing gasket layer, and the first sealing gasket layer is tightly fitted with the compression chamber; a plurality of compression plates are provided in the shell, and ... A transmission chamber, wherein a transmission assembly is arranged in the transmission chamber, wherein the transmission assembly comprises a first gear coaxially fixed with the rotating rod, wherein the first gear is meshed with a second gear; a transmission rod is coaxially welded and fixed to the second gear, wherein the transmission rod is rotatably connected to the inside of the outer shell, the transmission rod extends to the inside of any channel, and fan blades are arranged on the side wall of the transmission rod extending to the inside of the channel; the compression chamber is connected with a test chamber, wherein the test assembly is arranged inside the test chamber, the test chamber is connected with the first pump assembly, and a one-way valve is arranged at the connection between the test chamber and the collecting hole and the compression chamber, and the control system controls the first pump assembly to extract external gas through the collecting hole according to the volume and position of the target food.

[0011] Furthermore, the control system includes a camera and a controller; the camera is used to collect image information of a side of the shell close to the collecting hole; the controller is used to receive target information input by a user, obtain the position information and volume information of the target food in the target information according to the image information, and control the first pump assembly and the throttle valve to work according to the position of the target food. After the air barrier is tilted to the center position of the target food in the image information, the first pump assembly and the throttle valve are controlled to work again, and the size of the barrier is adjusted until the barrier isolates the target food from the non-target food, and the volatile amino nitrogen content in the receiving assembly per unit time is obtained, and the volatile amino nitrogen content of the target food is calculated in combination with the volume size of the target food, and the communication module is controlled to output the volatile amino nitrogen content to the user.

[0012] Furthermore, the control system also includes an infrared detector, which is used to collect temperature information at multiple angles on one side of the shell close to the collecting hole. The controller controls the first pump assembly and the throttle valve to adjust the size and tilt position of the air barrier according to the temperature information, and controls the communication module to operate according to the temperature information.

[0013] Furthermore, the control system also includes a humidity sensor, which is used to collect humidity information of the environment. The controller obtains the temperature of the target food based on the temperature information, and obtains the corruption characteristics of the target food based on the image information, and establishes a correlation between the time, humidity information, temperature information and corruption characteristics and the volatile amino nitrogen content. The volatile amino nitrogen content curve and the corresponding corruption characteristics of the target food are predicted based on the correlation. The controller is used to control the communication module to alarm the user when the volatile amino nitrogen content and the corruption characteristics reach the corruption standard.

[0014] Furthermore, the controller is also used to generate a barcode according to the volatile amino nitrogen content curve and the corruption characteristics, and control the communication module to output the corresponding barcode to the user.

[0015] Furthermore, the camera is also used to collect barcode images, and the controller is also used to obtain corresponding predicted corruption characteristics based on the barcode image and real-time time, and obtain real-time corruption characteristics based on the image information collected in real time, and calculate the correlation between the real-time corruption characteristics and the predicted corruption characteristics. When the similarity is greater than a preset value, the communication module is controlled to output the predicted volatile amino nitrogen content to the user. When the similarity is less than or equal to the preset value, the first pump assembly and the throttle valve are controlled to operate.

[0016] Furthermore, it includes a secondary detection component, which includes an ammonia nitrogen sensor and a reaction chamber opened inside the shell, the second pump component is connected to the reaction chamber, and a first solenoid valve is provided at the connection between the second pump component and the reaction chamber, and a second solenoid valve is provided at the connection between the second pump component and the test chamber; the reaction chamber is connected to a storage chamber, and a fourth solenoid valve and a flow sensor are provided at the connection, the flow sensor is used to collect flow information of the fluid passing through the connection between the storage chamber and the reaction chamber, a buffer liquid is provided in the storage chamber, the buffer liquid is used to react with volatile amino acids, the ammonia nitrogen sensor is used to obtain ammonia nitrogen content information of the buffer solution in the reaction chamber, the controller is also used to control the operation of the first solenoid valve and the fourth solenoid valve according to the volatile amino nitrogen content information, and control the operation of the second solenoid valve according to the ammonia nitrogen content information and the flow information, the controller is also used to judge the accuracy of the volatile amino nitrogen content information according to the ammonia nitrogen content information and the flow information, and control the communication module to output the judgment result to the user.

[0017] Furthermore, a plurality of one-way teeth are provided on the side wall of the storage chamber, and a second sealing gasket layer is slidably matched with the side wall of the storage chamber, and a plurality of weights are provided on the side of the second sealing gasket layer away from the reaction chamber.

[0018] Technical principles and beneficial effects of the above scheme: 1. This solution, through the design of the shielding component, uses gas to generate a gas barrier to expel the volatile amino nitrogen on the surface of the target food, and uses the gas barrier to form a gas barrier, and uses image recognition technology to locate the target food, so as to adjust the gas barrier to cut off the gas convection inside and outside the gas barrier, thereby avoiding the negative impact of volatile amino nitrogen generated by other foods on the detection of the target food. This solution can obtain the content of volatile amino nitrogen released by the target food per unit time to a certain extent by collecting and detecting the volatile amino nitrogen inside the gas barrier, and roughly calculate its volatile amino nitrogen content in combination with the volume of the target food, thereby assisting users in judging the freshness of the target object. Compared with the existing technology, the components used for sample collection and analysis are relatively simple, which is conducive to reducing the size of the device and avoiding the problem of limited usage scenarios due to the large size of the device. At the same time, this solution can achieve non-destructive testing. When faced with some high-priced foods, it can avoid economic losses caused by testing as much as possible. In addition, the device has a low degree of manual participation in the process from sample collection, processing to analysis, which is conducive to reducing the difficulty of device operation, thereby reducing the professional quality requirements for operators and helping to improve the market acceptance of the device.

[0019] 2. This solution, through the design of the receiving component and the compression and collection of the gas, allows the gas to be enriched in the device, thereby increasing the probability of contact and collision between the volatile amino nitrogen gas and the test component and improving the detection speed of the test component. At the same time, as the gas is compressed, the gas flows in the receiving component, which is beneficial to reduce the detection error caused by the uneven distribution of volatile amino nitrogen. By enriching the gas, the volume of the receiving component used to store the gas is reduced, which is beneficial to further reduce the volume of the device and improve the portability of the device. Compared with the solution of the same volume but without gas compression, it can increase the range of sample collection and thus improve the accuracy of data detection.

[0020] 3. The control system in this solution collects image information through the camera, temperature information through the infrared detector, and humidity information through the humidity sensor. This multi-sensor information fusion method has never been used in existing animal-derived food freshness detection devices. The controller uses these multi-source information, such as first using image information to determine the location and size of the target food, and then combining temperature and humidity information to predict the volatile amino nitrogen content curve of the target food and the corresponding corruption characteristics, thus achieving a more comprehensive and accurate detection and prediction function, which is different from the control system of a single sensor or a simple combination in the prior art. Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axonometric diagram of an embodiment of a device for rapid detection of freshness of animal-derived food of the present invention; Figure 2 It is a front view of an embodiment of a device for rapid detection of freshness of animal-derived food of the present invention; Figure 3 It is a side view of an embodiment of a device for rapid detection of freshness of animal-derived food of the present invention; Figure 4 for Figure 2 Middle AA section; Figure 5 for Figure 3 Middle BB section; Figure 6 for Figure 3 Middle CC Section Figure 7 for Figure 4 Enlarged view of point D in the middle Figure 8 The figure is a circuit diagram of an embodiment of a device for rapid detection of freshness of animal-derived food of the present invention.

[0022] The figure marks in the drawings of the specification include: 1. shell; 2. receiving component; 21. compression chamber; 22. rotating rod; 23. compression plate; 231. first sealing gasket layer; 24. spring; 25. test chamber; 26. transmission component; 261. first gear; 262. second gear; 263. transmission rod; 264. fan blade; 27. collecting hole; 3. shielding component; 31. channel; 32. regulating tube; 33. strip hole; 34. connecting plate; 341. opening; 4. secondary detection component; 41. reaction chamber; 42. storage chamber; 43. one-way tooth; 44. weight; 5. quartz crystal microbalance gas sensor; 6. ratchet; 7. pawl; 8. humidity sensor; 9. infrared detector; 10. camera; 11. first pump component; 12. second pump component; 101. first solenoid valve; 102. second solenoid valve; 103. third solenoid valve. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The following is further described in detail through specific implementation methods: Embodiment 1:

[0027] As attached Figure 1 -Attached Figure 8 As shown: a device for rapid detection of freshness of animal-derived food, comprising a shell 1, in which a test component and a communication module are arranged. In this embodiment, the test component is a quartz crystal microbalance gas sensor 5. There are also a shielding component 3 and a receiving component 2 in the shell 1. The shielding component 3 is used to spray fluid to the outside to form an air barrier. The shielding component 3 includes a first pump component 11 and a plurality of strip holes 33 opened on the shell 1. In this embodiment, the first pump component 11 is a first air pump. In this embodiment, the strip holes 33 are arranged in an array along the center circumference of the receiving component 2 at the bottom of the shell 1. The air pump is connected to a plurality of channels 31 through pipelines, and a throttle valve is provided at one end of the channel 31 connected to the pipeline, and the other end of the channel 31 is connected to the adjacent strip hole 33. A regulating tube 32 is provided in the channel 31, and the cross section of the regulating tube 32 is trapezoidal, and the side wall of the regulating tube 32 is slidably matched with the channel 31. The regulating tube 32 is in a floating state in the channel 31, and a connecting plate 34 of elastic material is bonded and fixed to one end of the regulating tube 32 close to the inside of the channel 31, and the side of the regulating tube 32 close to the connecting plate 34 is hinged to the channel 31 (combined with Figure 7 The middle dotted line position is the hinge axis position), and an opening 341 is formed on the connecting plate 34 located on the side away from the center point of the housing 1. The opening 341 is squeezed and closed when the connecting plate 34 is not deformed.

[0028] The receiving component 2 is used to collect volatile amino nitrogen generated by the target food. The receiving component 2 includes a collecting hole 27 opened on the side wall of the outer shell 1 near the strip hole 33. The center of the collecting hole 27 is located at the center position of the bottom of the outer shell 1. The collecting hole 27 is connected to the compression chamber 21. The compression chamber 21 is located inside the outer shell 1. A rotating rod 22 is rotatably connected in the compression chamber 21. The rotating rod 22 is provided with a limiting component, which is used to limit the unidirectional rotation of the rotating rod 22.

[0029] Combination Figure 4 As shown, a plurality of compression plates 23 are slidably fitted on the inner bottom of the compression chamber 21. The compression plates 23 are evenly distributed along the circumference of the rotating rod 22. The bottom and top of the compression plates 23 are respectively against the bottom and top of the compression chamber 21. A spring 24 is fixedly connected to the side wall of the compression plate 23. The end of the spring 24 away from the compression plate 23 is fixedly connected to the rotating rod 22. The side wall of the compression plate 23 opposite to the side where the spring 24 is installed is fixedly connected to a first sealing gasket layer 231. The first sealing gasket layer 231 is tightly fitted with the compression chamber 21.

[0030] A transmission cavity is provided in the housing 1, and a transmission assembly 26 is provided in the transmission cavity. In this embodiment, the transmission assembly 26 includes a first gear 261 coaxially fixed to the rotating rod 22, and a second gear 262 is meshed on the first gear 261. A transmission rod 263 is coaxially welded and fixed to the second gear 262, and the transmission rod 263 is rotatably connected to the inside of the housing 1. The transmission rod 263 extends to the inside of any channel 31 (it is necessary to ensure that the axis of the transmission rod 263 is parallel to the axis of the rotating rod 22 to ensure that the first gear 261 and the second gear 262 can be stably transmitted), and a fan blade 264 is provided on the side wall of the transmission rod 263 extending to the inside of the channel 31.

[0031] In this embodiment, the limiting assembly includes a ratchet 6 located in the transmission cavity, the ratchet 6 is coaxially fixedly connected to the rotating rod 22, a pawl 7 is hinged on the inner side wall of the transmission cavity, the ratchet 6 is meshed with the pawl 7, and a torsion spring is provided at the hinge between the pawl 7 and the inner side wall of the transmission cavity, one end of the torsion spring is fixedly connected to the pawl 7, and the other end of the torsion spring is fixedly connected to the inner side wall of the transmission cavity.

[0032] The output end of the compression chamber 21 is connected to the test chamber 25, and the test component is arranged inside the test chamber 25. The test chamber 25 is connected to the second pump component 12. In this embodiment, the second pump component 12 is an air pump with a negative pressure function. A one-way valve is provided at the connection between the test chamber 25 and the collecting hole 27 and the compression chamber 21 to ensure that the outside air flows from the collecting hole 27 through the compression chamber 21 to the test chamber 25, and the test component is used to detect the volatile amino nitrogen content inside the test chamber 25.

[0033] It also includes a control system, which includes a camera 10 and a controller; the camera 10 is fixedly connected to the side wall of the housing 1 near the strip hole 33 by bolts, and the camera 10 is used to collect image information on the side of the housing 1 near the collecting hole 27; the throttle valve, the first pump component 11, the second pump component 12, the communication module, the quartz crystal microbalance gas sensor 5 and the camera 10 are all connected to the controller signal, and the controller is used to receive target information input by the user, obtain the position information and volume size information of the target food in the target information according to the image information collected by the camera 10, and control the first pump component 11 and the throttle valve to work according to the position of the target food, adjust the angle of the formed air barrier so that it surrounds the central area of ​​the target food, control the first pump component 11 and the throttle valve to work again, adjust the size of the air barrier until the air barrier isolates the target food from the non-target food, obtain the content of volatile amino nitrogen in the receiving component 2 per unit time, and calculate the volatile amino nitrogen content of the target food in combination with the size of the target food, and control the communication module to output the volatile amino nitrogen content to the user.

[0034] The specific implementation process is as follows: when using the device, align the side of the device with the bar hole 33 with the target food, start the device, and the camera 10 continuously collects image information of the location of the target object. The user inputs target information containing the target food into the controller to select the corresponding target food. Then the controller extracts features from the image information to obtain the size of the target food and its relative distance from the bar hole 33.

[0035] The controller controls the operation of the air pump according to the position of the target food, adjusts the opening of the throttle valve, and pumps high-pressure gas into the corresponding channel 31. Under the action of the high-pressure gas, the connecting plate 34 is deformed, so that the opening 341 is opened, and part of the high-pressure gas is transported to the side wall of the regulating tube 32 through the opening 341. Under the impact of the high-pressure gas, the regulating tube 32 is pushed to tilt at a certain angle. Due to the trapezoidal design of the cross-section of the regulating tube 32, the length of the gas passing through the regulating tube 32 increases as the distance between it and the housing 1 increases, so that the air barrier formed by the adjacent strip holes 33 can overlap, so that the air food output by each strip hole 33 is combined with the device to form a relatively closed air barrier in the shape of a cylinder or a truncated cone (when the regulating tube 32 is tilted).

[0036] At the initial stage of operation of the device, the controller adjusts the throttle valve opening to cause the maximum deformation of the connecting plate 34, so that the opening 341 remains in the maximum open state, and the high-pressure gas acting on the side wall of one side of the regulating tube 32 causes each regulating tube 32 to tilt toward the center to the maximum extent, forming a minimum intersection area, and then gradually adjusts the throttle valve opening to gradually reduce the deformation of the connecting plate 34 and the opening state of the opening 341; thereby gradually expanding the air barrier, and during the gradual expansion of the air barrier, the high-pressure airflow can expel the gas on the surface of the target food.

[0037] The user makes a preliminary judgment on the minimum intersection area based on changes in the external environment around the air barrier (such as the dent in a food packaging bag caused by wind, or the location where liquefied water vapor on the surface of frozen food moves rapidly), and adjusts the position of the device to move the minimum intersection area roughly to the target food, thereby gradually expanding the air barrier.

[0038] In this embodiment, the controller moves the minimum air intersection area of ​​the air barrier in the image information approximately to the target food, obtains the relative position relationship between the target food and the strip hole 33 according to the image information, controls the operation of the corresponding throttle valve, and adjusts the flow rate of the gas flowing out of the channel 31.

[0039] For example, it is necessary to tilt the air barrier to one side, control the corresponding throttle valve to work, adjust the flow rate of the gas flowing out of the channel 31, increase the flow rate of a part of the channel 31, and reduce the flow rate of a part of the channel 31, and then increase the working power of the air pump through the controller. In the channel 31 with increased flow, the impact force of the high-pressure gas on the connecting plate 34 in the channel 31 with increased flow will also increase, so that the deformation of the connecting plate 34 increases, and the size of the opening 341 also increases. Part of the high-pressure gas acts on the side wall of the regulating tube 32, pushing the regulating tube 32 to tilt toward the bottom center area of ​​the shell 1, so that the inclination angle of the airflow output by the strip hole 33 to the bottom center area of ​​the shell 1 increases. In the channel 31 with reduced flow, the impact force acting on the corresponding connecting plate 34 is reduced, so that the deformation of the connecting plate 34 is reduced, the size of the opening 341 is also reduced, the high-pressure gas acting on the side wall of the regulating tube 32 is reduced, and the regulating tube 32 gradually resets or always remains parallel to the channel 31, so that the inclination angle of the airflow output by the strip hole 33 to the bottom center area of ​​the shell 1 is reduced. The tilt position of the air barrier can be adjusted to more accurately cover the area of ​​food to be inspected.

[0040] Subsequently, the controller controls the operation of the second pump assembly 12, and continuously sucks the gas inside the air barrier through the collecting hole 27. At the same time, due to the flow of gas in the channel 31, the gas drives the fan blades 264 to move, and the fan blades 264 drive the compression plate 23 to move through the rotating rod 22. The compression plate 23 drives the gas in the compression chamber 21 to move through the first sealing pad layer 231. As the compression plate 23 moves, the volume of the gas in the compression chamber 21 gradually decreases, and after the compression plate 23 moves to a suitable position, the compressed gas enters the test chamber 25.

[0041] The quartz crystal microbalance gas sensor 5 continuously collects the volatile amino nitrogen content in the test chamber 25. The controller calculates the increment of volatile amino nitrogen per unit time in the test chamber 25 according to the volatile amino nitrogen content and the volume of the test chamber 25. At the same time, the type and approximate volume of the detected food are determined according to the image information. The average density of the food is obtained according to the type of food. For example, the average density of fish is A grams per cubic centimeter. The approximate weight of the food can be obtained according to the average density and the approximate volume. The mass ratio of the volatile amino nitrogen in the food is calculated according to the approximate weight of the food and the increment of volatile amino nitrogen obtained by the detection. Then the controller controls the communication module The block outputs the mass ratio of volatile amino nitrogen of the target food, that is, the volatile amino nitrogen content, to the user. After a test is completed, the user can make a certain judgment on the freshness of the food according to the increment of volatile amino acids. Compared with the solution of directly using the volume ratio, the solution of using the mass ratio can correspond to the national standard, which is convenient for operators to judge the freshness of the target food. There is no need for operators to conduct corresponding experiments based on the device data to obtain corresponding data references, which helps to reduce the research and development cost of the device. Moreover, since no new units are used, it is also helpful to improve the acceptance of existing food freshness testers, thereby facilitating the subsequent product promotion.

[0042] Embodiment 2:

[0043] The difference from Example 1 is that the control system also includes an infrared detector 9, which is used to collect temperature information at multiple angles on a side of the housing 1 where the collecting hole 27 is provided. The infrared detector 9 is fixedly connected to a side wall of the housing 1 close to the strip hole 33 by bolts, and the infrared detector 9 is connected to the controller model. The controller controls the first pump assembly 11 and the throttle valve to adjust the size and tilt position of the barrier according to the temperature information.

[0044] The specific implementation process is as follows: During the use of this device, the infrared detector 9 continuously collects temperature information on the side of the housing 1 close to the collection hole 27. As the device works, the heat generated by the working process of each component is inevitably transferred to the channel 31, and follows the gas out of the device. Therefore, in the temperature information, the temperature of the position where the air barrier is formed will be different from the ambient temperature, and the numerical difference will increase as the distance from the device decreases. That is, by collecting temperature information at multiple angles, the angle between each air barrier and the side wall of the housing 1 can be obtained. Through this angle, the size and position of the air barrier can be judged more accurately, so that the controller can be adjusted more accurately in combination with the image information, thereby improving the accuracy of this solution. The controller then controls the communication module to output temperature information to the user, helping the user to judge the ambient temperature, which is conducive to reducing the risk of subsequent food corruption.

[0045] At the same time, the infrared detector 9 can also be used to preliminarily collect the temperature of frozen food. When the target food is lower than the set temperature, the food is frozen food. As the test progresses, the temperature increment of the target food per unit time is greater than the preset increment, and the target food may be thawed. At this time, the controller controls the communication module to send an alarm message to the user, prompting the user to promptly check and further test the target food to avoid further thawing and cause irreparable economic losses.

[0046] Embodiment 3:

[0047] The difference from Example 2 is that the control system further includes a humidity sensor 8, which is fixedly connected to the side wall of the housing 1 by bolts, and is used to collect humidity information of the environment. The humidity sensor 8 is connected to the controller signal, and the controller obtains the temperature of the target food according to the temperature information, and obtains the corruption characteristics of the target food according to the image information, and establishes a relationship between the time, humidity information, temperature information and corruption characteristics and the volatile amino nitrogen content, and predicts the volatile amino nitrogen content curve and the corresponding corruption characteristics of the target food according to the relationship. The controller is used to control the communication module to alarm the user when the volatile amino nitrogen content and the corruption characteristics reach the corruption standard. The controller is also used to generate a barcode according to the volatile amino nitrogen content curve and the corruption characteristics, and control the communication module to output the corresponding barcode to the user; The camera 10 is also used to collect barcode images, and the controller is also used to obtain the corresponding predicted corruption characteristics based on the barcode image and real-time time, and obtain the real-time corruption characteristics based on the image information collected in real time, and calculate the correlation between the real-time corruption characteristics and the predicted corruption characteristics. When the similarity is greater than a preset value, the communication module is controlled to output the predicted volatile amino nitrogen content to the user. When the similarity is less than or equal to the preset value, the first pump component 11 and the throttle valve are controlled to work.

[0048] The specific implementation process is as follows: During the use of the device, the humidity sensor 8 continuously collects humidity information of the environment, and at the same time, the controller obtains the corruption characteristics of the target food according to the image information, wherein the corruption characteristics mainly include the size, shape, type, color, and surface morphology of the target food (such as whether mold spots appear, the location of mold spots, the size of mold spots, the color of mold spots, etc.), and constructs a correlation between these corruption characteristics, temperature information, humidity information and the volatile amino nitrogen content at the corresponding time point. The correlation can be used to obtain the influence of different influencing factors on the generation of volatile amino nitrogen and corruption characteristics, thereby predicting the change curve of the volatile amino nitrogen content of the target food within a certain period of time and the corruption characteristics that follow the change curve, and based on the change curve of the volatile amino nitrogen content and the corruption characteristics, when the predicted volatile amino nitrogen content exceeds the corruption standard of the corresponding food for the first time. When mold spots first appear in the corruption characteristics (that is, when the volatile amino nitrogen content and corruption characteristics reach the corruption standard), the control communication module alarms the user. For example, the corruption characteristics of a target food in the initial state are normal color and no mold spots, and the volatile amino nitrogen content is a at this time. Under the condition of unchanged temperature and humidity conditions, according to the correlation between the time and volatile amino nitrogen content corresponding to the size, shape and type of food, after b hours, the volatile amino nitrogen content increases by c, c is the minimum value of the corruption standard for the size, shape and type of food. At this time, a mold spot appears on the surface of the target food, that is, the controller controls the communication module to alarm the user at this time point b hours after the initial time, reminding the user that the food may be corrupted at this time, and prompting the user to go for a second inspection, thereby reducing the time cost and inspection cost brought by regular repeated inspections.

[0049] At the same time, after obtaining the volatile amino nitrogen content curve and the corresponding corruption characteristics of the target food, the controller generates a barcode according to the above content, and the user can print it and paste it on the corresponding target food for marking, thereby reducing the occurrence of repeated inspections in the subsequent inspection process and avoiding the waste of time and inspection costs. At the same time, operators who are not equipped with this device can also obtain the volatile amino nitrogen content curve and the corresponding corruption characteristics of the target food by scanning the barcode, and then read the corresponding predicted volatile amino nitrogen content and the corresponding corruption characteristics according to the initial time and the current time. When the corruption characteristics are consistent with the corruption characteristics observed by the operator with the naked eye, the operator can compare the corresponding predicted volatile amino nitrogen content and the corresponding corruption characteristics. If the spoilage characteristics predicted at the same time point are the same, the curve prediction is more accurate, and the operator can use the predicted volatile amino nitrogen content as the criterion for judging the freshness of the target food. If the spoilage characteristics observed by the operator's naked eye are different from the predicted spoilage characteristics, there will be errors in the curve prediction results. At this time, there will be errors in the volatile amino nitrogen content predicted by the curve, and the operator needs to re-test the volatile amino nitrogen of the target food. The use of this solution can further reduce the inspection cost. At the same time, since the barcode reading has low equipment requirements, the operator can use other cheaper equipment for reading, thereby reducing the inspection cost during the inspection process of multiple people.

[0050] In the subsequent review of the food, the operator can use the camera 10 to scan the barcode, and the controller obtains the volatile amino nitrogen content curve and the corresponding corruption characteristics of the corresponding food according to the barcode. Then, the controller obtains the predicted volatile amino nitrogen content and the corresponding corruption characteristics at the time point according to the real-time time of scanning the barcode, and then collects the image information of the target video through the camera 10, obtains the real-time corruption characteristics according to the image information, and calculates the similarity between the real-time corruption characteristics and the predicted corruption characteristics. When the similarity is greater than the preset value, the controller controls the communication module to output the predicted volatile amino nitrogen content to the user. If the similarity is less than or equal to the preset value, the controller controls the first pump component 11 and the throttle valve to work, and collects the volatile amino nitrogen content of the target food again. When facing the operator equipped with this device, this solution can reduce the workload of the operator to a greater extent, shorten the operation time, and reduce the difficulty of the operation of this solution, which is conducive to improving the acceptance of the target users, thereby reducing the difficulty in the subsequent market promotion process. At the same time, it can also avoid the errors that may be caused by naked eye comparison and improve the accuracy of judgment.

[0051] Embodiment 4:

[0052] The difference from Example 3 is that it also includes a secondary detection component 4, the secondary detection component 4 includes an ammonia nitrogen sensor and a reaction chamber 41 opened inside the shell 1, the second pump component 12 is connected to the reaction chamber 41, and a first solenoid valve 101 is provided at the connection between the second pump component 12 and the reaction chamber 41, and a second solenoid valve 102 is provided at the connection between the second pump component 12 and the test chamber 25. In this embodiment, the second pump component 12 is a negative pressure and positive pressure dual-purpose air pump; a third solenoid valve 103 is provided at the connection between the test chamber 25 and the reaction chamber 41, the reaction chamber 41 is connected to the storage chamber 42, and a fourth solenoid valve (not shown in the drawings) and a flow sensor are provided at the connection between the reaction chamber 41 and the storage chamber 42. The flow sensor is used to collect flow information of the fluid passing through the connection between the storage chamber 42 and the reaction chamber 41. A buffer liquid is provided in the storage chamber 42. In this embodiment, the buffer The flushing liquid is a buffer solution composed of pure water, a weak acid salt and a weak base salt. At the same time, the buffer liquid can also be water, an organic solvent or other liquids that do not introduce new ammonia nitrogen element impurities after reacting with volatile amino nitrogen. The buffer liquid is used to react with volatile amino acids. The first solenoid valve 101, the second solenoid valve 102, the third solenoid valve 103, the ammonia nitrogen sensor and the flow sensor are all connected to the controller signal. The ammonia nitrogen sensor is used to obtain the ammonia nitrogen content information of the buffer solution in the reaction chamber 41. The controller is also used to control the operation of the first solenoid valve 101 and the fourth solenoid valve according to the volatile amino nitrogen content information, and control the operation of the second solenoid valve 102 according to the ammonia nitrogen content information and the flow information. The controller is also used to judge the accuracy of the volatile amino nitrogen content information according to the ammonia nitrogen content information and the flow information, and control the communication module to output the judgment result to the user; A plurality of one-way teeth 43 are bonded and fixed to the side wall of the storage chamber 42 , and a second sealing gasket layer is slidably matched with the side wall of the storage chamber 42 . A plurality of weights 44 are arranged on the side of the second sealing gasket layer away from the reaction chamber 41 .

[0053] The specific implementation process is as follows: in the initial state, the controller controls the first solenoid valve 101 and the second pump assembly 12 to work, extract a part of the gas in the reaction chamber 41, and close the first solenoid valve 101 after a certain period of time, so that the reaction chamber 41 is in a negative pressure state. After the gas is detected in the test chamber 25, the controller starts the third solenoid valve 103, and under the action of air pressure, the gas in the test chamber 25 enters the reaction chamber 41.

[0054] At the same time, the controller starts the second solenoid valve 102 and pumps air into the test chamber 25 through the second pump assembly 12, thereby expelling the gas in the test chamber 25 and completely expelling it into the reaction chamber 41. Then the controller controls the fourth solenoid valve to open, and the liquid in the storage chamber 42 flows into the reaction chamber 41 under the action of gravity and the like to react with the gas in the reaction chamber 41, so that the volatile amino nitrogen in the gas mixes with the buffer liquid to form an aqueous solution containing ammonia nitrogen element. At the same time, the flow sensor continuously collects the flow information of the buffer liquid flowing into the reaction chamber 41. The controller controls the fourth solenoid valve to operate according to the flow information, so that the buffer liquid intermittently enters the reaction chamber 41, and the volume of the buffer liquid entering the reaction chamber 41 each time is the same. The ammonia nitrogen sensor continuously collects the ammonia nitrogen element content of the buffer liquid in the reaction chamber 41, that is, the ammonia nitrogen content information. After the buffer solution is dripped into the reaction chamber 41 once, after the ammonia nitrogen content information is stable, it is dripped again for the second time. After the ammonia nitrogen content information is stable, if the second If there is no obvious change, the buffer liquid in the reaction chamber 41 is a saturated solution at this time, and this process is repeated until the ammonia nitrogen content information is stable and its value is lower than that at the last dripping, that is, the aqueous solution containing ammonia nitrogen element in the reaction chamber 41 is in an unsaturated state at this time, and the ammonia nitrogen content information and flow information at the last dripping of this time are obtained, and the content of ammonia nitrogen element in the solution is calculated, thereby calculating the content of volatile amino nitrogen, and comparing the content with the data collected by the quartz crystal microbalance gas sensor 5 of this part of the gas. When the difference between the two is less than the preset value, the data collected by the quartz crystal microbalance gas sensor 5 is reliable. If the difference between the two is greater than or equal to the preset value, the data collected by the quartz crystal microbalance gas sensor 5 may have errors. At this time, the controller controls the communication module to output two test results to the user, and prompts the user so that the user can analyze or re-check to avoid the problem of misjudgment caused by data errors in a single test.

[0055] The design of the secondary detection component 4 enables the device to perform secondary detection on the collected sample gas, thereby improving the accuracy of the test. At the same time, since the present scheme has no special requirements for the test location, etc., the present scheme can be carried out when the operator is on the way to another target food after testing one target food, thereby reducing the time cost brought by the secondary detection. Moreover, as the operator moves, the shaking process of the device can also promote the combination of the buffer liquid and the volatile amino nitrogen, thereby reducing the reaction time of the two and improving the efficiency of the secondary detection. At the same time, since the present scheme needs to combine the buffer liquid with the volatile amino nitrogen, while detecting the volatile amino nitrogen content, it can also absorb and treat it to prevent the volatile amino nitrogen from accumulating inside the device and causing damage to the operator's body when discharged.

[0056] During the movement of the operator, due to inertia, the weight 44 shakes in the storage chamber 42. During the shaking, the weight 44 pushes the second sealing pad layer to move towards the reaction chamber 41, and pushes the buffer solution to enter the reaction chamber 41. Due to the action of the one-way teeth 43, it is difficult for the second sealing pad layer to move in the opposite direction relying on the pressure of the liquid and the gas, thereby avoiding the suction of the liquid in the reaction chamber 41 and affecting the test accuracy. The design of the weight 44, etc., utilizes inertia to help the buffer liquid enter the reaction chamber 41, avoiding the air pressure inside the reaction chamber 41 and the surface tension of the liquid, which makes it difficult for the buffer liquid to enter the reaction chamber 41 and affect the secondary detection, thereby helping to improve the success rate of the secondary detection.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A device for rapid detection of freshness of animal-derived food, comprising a housing (1), wherein a testing component and a communication module are arranged in the housing (1), characterized in that: A shielding component (3) and a receiving component (2) are also provided in the housing (1); the shielding component (3) is used to spray fluid to the outside to form an air barrier; the receiving component (2) is used to collect volatile amino nitrogen generated by the target food; and the testing component is used to detect the volatile amino nitrogen content inside the receiving component (2); The device also includes a control system, which is used to receive target information input by a user and collect image information around the housing (1), and obtain the size and position of the target food in the target information based on the image information, control the shielding component (3) to adjust the tilt position of the air barrier according to the position of the target food, and when the air barrier is located at the center of the target food, control the shielding component (3) to adjust the coverage area of ​​the barrier according to the size of the target food until the barrier isolates the target food from the non-target food, obtain the volatile amino nitrogen content in the receiving component (2) per unit time, calculate the volatile amino nitrogen content of the target food in combination with the volume of the target food, and control the communication module to output the volatile amino nitrogen content to the user.

2. The device for rapid detection of freshness of animal-derived food according to claim 1, characterized in that: The shielding component (3) comprises a first pump component (11) and a plurality of strip holes (33) formed on the housing (1). The first pump component (11) is connected to the plurality of channels (31), and a throttle valve is provided at one end of the first pump component (11) connected to the channel (31). The other end of the channel (31) is connected to an adjacent strip hole (33). An adjusting tube (32) is provided in the channel (31). The adjusting tube (32) is floatingly installed in the channel (31). The cross section of the adjusting tube (32) is trapezoidal, and the side walls of the adjusting tube (32) are slidably matched with the channel (31). A connecting plate (34) made of an elastic material is fixedly connected to one end of the adjusting tube (32) close to the inside of the channel (31). An opening (341) is provided on the connecting plate (34) located on a side away from the center point of the side wall of the housing (1) provided with the strip holes (33). The control system is used to control the operation of the first pump component (11) and the throttle valve according to the volume and position of the target food.

3. The device for rapid detection of freshness of animal-derived food according to claim 2, characterized in that: The receiving assembly (2) comprises a collecting hole (27) formed on a side wall of the housing (1) near the strip hole (33); the collecting hole (27) is connected to a compression chamber (21); a rotating rod (22) is rotatably connected to the compression chamber (21); and a limiting assembly is provided on the rotating rod (22); the limiting assembly is used to limit the unidirectional rotation of the rotating rod (22); a plurality of compression plates (23) are slidably matched on the inner bottom of the compression chamber (21); the compression plates (23) are evenly distributed along the circumference of the rotating rod (22); the bottom and top of the compression plates (23) are respectively abutted against the bottom and top of the compression chamber (21); a spring (24) is fixedly connected to the side wall of the compression plate (23); one end of the spring (24) away from the compression plate (23) is fixedly connected to the rotating rod (22); a first sealing pad layer (231) is fixedly connected to the side wall of the compression plate (23) on which the spring (24) is installed; and the first sealing pad layer (231) is tightly fitted with the compression chamber (21); A transmission cavity is provided in the housing (1), a transmission assembly (26) is provided in the transmission cavity, the transmission assembly (26) comprises a first gear (261) coaxially fixed to the rotating rod (22), a second gear (262) meshing with the first gear (261); a transmission rod (263) is coaxially welded and fixed to the second gear (262), the transmission rod (263) is rotatably connected to the inside of the housing (1), the transmission rod (263) extends to the inside of any channel (31), and a fan blade (264) is provided on the side wall of the transmission rod (263) extending to the inside of the channel (31); The compression chamber (21) is connected to a test chamber (25), a test assembly is arranged inside the test chamber (25), the test chamber (25) is connected to the first pump assembly (11), a one-way valve is provided at the connection point between the test chamber (25) and the collection hole (27) and the compression chamber (21), and the control system controls the first pump assembly (11) to extract external gas through the collection hole (27) according to the volume and position of the target food.

4. The device for rapid detection of freshness of animal-derived food according to claim 3, characterized in that: The control system includes a camera (10) and a controller; The camera (10) is used to collect image information of a side of the housing (1) close to the collection hole (27); The controller is used to receive target information input by a user, obtain the position information and volume information of the target food in the target information according to the image information, and control the first pump component (11) and the throttle valve to work according to the position of the target food. After the air barrier in the image information is tilted to the center position of the target food, the first pump component (11) and the throttle valve are controlled to work again, and the size of the barrier is adjusted until the barrier isolates the target food from the non-target food, and the volatile amino nitrogen content in the receiving component (2) per unit time is obtained, and the volatile amino nitrogen content of the target food is calculated in combination with the volume of the target food, and the communication module is controlled to output the volatile amino nitrogen content to the user.

5. The device for rapid detection of freshness of animal-derived food according to claim 4, characterized in that: The control system further comprises an infrared detector (9) for collecting temperature information at multiple angles on one side of the housing (1) close to the collecting hole (27). The controller controls the first pump assembly (11) and the throttle valve to adjust the size and tilt position of the air barrier according to the temperature information, and controls the communication module to operate according to the temperature information.

6. The device for rapid detection of freshness of animal-derived food according to claim 5, characterized in that: The control system also includes a humidity sensor (8), which is used to collect humidity information of the environment. The controller obtains the temperature of the target food according to the temperature information, obtains the corruption characteristics of the target food according to the image information, and establishes a relationship between the time, humidity information, temperature information and corruption characteristics and the volatile amino nitrogen content. The volatile amino nitrogen content curve and the corresponding corruption characteristics of the target food are predicted according to the relationship. The controller is used to control the communication module to alarm the user when the volatile amino nitrogen content and the corruption characteristics reach the corruption standard.

7. The device for rapid detection of freshness of animal-derived food according to claim 6, characterized in that: The controller is also used to generate a barcode according to the volatile amino nitrogen content curve and the corruption characteristics, and control the communication module to output the corresponding barcode to the user.

8. The device for rapid detection of freshness of animal-derived food according to claim 7, characterized in that: The camera (10) is also used to collect barcode images, and the controller is also used to obtain corresponding predicted corruption characteristics based on the barcode image and real-time time, and obtain real-time corruption characteristics based on the image information collected in real time, calculate the correlation between the real-time corruption characteristics and the predicted corruption characteristics, and when the similarity is greater than a preset value, control the communication module to output the predicted volatile amino nitrogen content to the user, and when the similarity is less than or equal to the preset value, control the first pump component (11) and the throttle valve to work.

9. The device for rapid detection of freshness of animal-derived food according to claim 8, characterized in that: The secondary detection component (4) comprises an ammonia nitrogen sensor and a reaction chamber (41) disposed inside the housing (1); the second pump component (12) is connected to the reaction chamber (41); a first solenoid valve (101) is provided at the connection between the second pump component (12) and the reaction chamber (41); and a second solenoid valve (102) is provided at the connection between the second pump component (12) and the test chamber (25); The reaction chamber (41) is connected to the storage chamber (42), and a fourth solenoid valve and a flow sensor are provided at the connection point. The flow sensor is used to collect flow information of a fluid passing through the connection point between the storage chamber (42) and the reaction chamber (41). A buffer liquid is provided in the storage chamber (42), and the buffer liquid is used to react with volatile amino acids. The ammonia nitrogen sensor is used to obtain ammonia nitrogen content information of the buffer solution in the reaction chamber (41). The controller is also used to control the operation of the first solenoid valve (101) and the fourth solenoid valve according to the volatile amino nitrogen content information, and to control the operation of the second solenoid valve (102) according to the ammonia nitrogen content information and the flow information. The controller is also used to judge the accuracy of the volatile amino nitrogen content information according to the ammonia nitrogen content information and the flow information, and to control the communication module to output the judgment result to the user.

10. The device for rapid detection of freshness of animal-derived food according to claim 9, characterized in that: The side wall of the storage chamber (42) is provided with a plurality of one-way teeth (43), and the side wall of the storage chamber (42) is slidably matched with a second sealing gasket layer, and a plurality of weights (44) are provided on a side of the second sealing gasket layer away from the reaction chamber (41).

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