A rapid freshness detection device for animal-derived foods

Abstract

The present invention relates to the technical field of food detection, and particularly relates to a rapid freshness detection device for animal-derived foods, which includes a housing. Inside the housing, there are also a shielding component and a receiving component. The shielding component is used to eject a fluid to the outside to form a barrier, and the receiving component is used to collect volatile amino nitrogen generated by the target food. It further includes a control system, which is used to control the shielding component to adjust the position of the barrier according to the position of the target food, and after the barrier is located at the center position of the target food in the image information, control the shielding component to adjust the coverage area of the barrier according to the size of the target food, obtain the content of volatile amino nitrogen in the receiving component per unit time, and calculate the content of volatile amino nitrogen in the target food in combination with the size of the target food. The present invention is used to accelerate the food freshness detection speed and at the same time reduce the operation steps of food freshness detection, thereby reducing the requirements for the professional quality of operators in food freshness detection technology.

Description

Technical Field

[0001] The present invention relates to the technical field of food detection, and particularly to a rapid freshness detection device for animal-derived foods. Background Art

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

[0003] Seafood, as a gift from the ocean, is deeply loved by consumers for its tender 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, during storage and transportation, seafood is prone to spoilage due to changes in environmental conditions.

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

[0005] Poultry foods, such as chicken and duck, also occupy an important position on people's dining tables. They not only have a delicious taste but also are rich in various nutrients such as protein, vitamins, and minerals, which help enhance human immunity and promote growth and development. However, poultry foods are also easily contaminated by microorganisms during processing and storage, resulting in quality decline and food safety problems.

[0006] Therefore, for animal-derived foods such as seafood, fish, and poultry, the freshness detection technology during their storage and transportation is particularly important. Through scientific detection technology, unqualified products can be discovered and processed in a timely manner, ensuring food quality and safety, maintaining market order, and protecting consumers' health rights and interests. At the same time, this also provides strong support for the supervision and development of the food industry, promoting the smooth progress of international trade. Currently, the commonly used index for judging food freshness is the content of volatile basic nitrogen. In the prior art, the schemes for detecting the content of volatile basic nitrogen in foods mainly include titration methods, photochemistry, and electrochemistry, etc. However, the above schemes have complicated operation steps and require high professional qualities of operators, which is not conducive to the popularization and use of the technology. At the same time, the titration method often requires sampling of foods, which is extremely likely to increase the economic loss during the detection process when facing some high-priced foods. For the photochemistry or electrochemistry schemes, their detection equipment has a large volume 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 foods, which is used to accelerate the food freshness detection speed and reduce the operation steps of food freshness detection, thereby reducing the requirements for the professional qualities of operators in food freshness detection technology.

[0008] To achieve the above object, the technical solution of the present invention is as follows: A rapid freshness detection device for animal-derived foods includes a housing. A testing component and a communication module are provided inside the housing. A shielding component and a receiving component are also provided inside the housing. The shielding component is used to spray a fluid to the outside to form an air barrier, and the receiving component is used to collect volatile amino nitrogen generated by the target food. And the testing component is used to detect the content of volatile amino nitrogen inside the receiving component; it also includes a control system, which is used to receive the target information input by the user and collect the image information around the housing, and obtain the size and position of the target food in the target information according to the image information. According to the position of the target food, the control system controls the shielding component to adjust the inclination position of the air barrier. When the air barrier is at the central position of the target food, according to the size of the target food, the control system controls the shielding component to adjust the coverage area of the barrier until the barrier isolates the target food from non-target foods, obtains the content of volatile amino nitrogen in the receiving component per unit time, calculates the content of volatile amino nitrogen of the target food in combination with the volume size of the target food, and controls the communication module to output the content of volatile amino nitrogen to the user.

[0009] Further, the shielding component includes a first pump assembly and a plurality of strip-shaped holes opened on the housing. The first pump assembly is communicated with a plurality of channels, and throttle valves are provided at one ends of the first pump assembly communicating with the channels. The other ends of the channels are communicated with adjacent strip-shaped holes. An adjusting pipe is provided inside the channel. The adjusting pipe is floatingly installed inside the channel. The cross-section of the adjusting pipe is trapezoidal, and the side walls of the adjusting pipe are all slidably matched with the channel. And a connecting plate made of an elastic material is fixedly connected to one end of the adjusting pipe close to the inside of the channel. An opening is formed on the connecting plate located on one side away from the center point of the side wall of the housing where the strip-shaped hole is provided. The control system is used to control the first pump assembly and the throttle valve to work according to the volume size and position of the target food.

[0010] Further, the receiving component includes a collection hole formed in the side wall of the outer shell close to the strip-shaped hole. The collection hole is communicated with a compression cavity. A rotating rod is rotatably connected in the compression cavity, and a limiting component is arranged on the rotating rod; the limiting component is used to limit the one-way rotation of the rotating rod. A plurality of compression plates are slidably matched with the bottom of the compression cavity. The compression plates are evenly distributed along the circumferential direction of the rotating rod. The bottom and top of the compression plates are respectively abutted against the bottom and top of the compression cavity. A spring is fixedly connected to the side wall of the compression plate. One end of the spring away from the compression plate is fixedly connected to the rotating rod. A first sealing cushion layer is fixedly connected to the side wall of the compression plate on the opposite side where the spring is installed. The first sealing cushion layers are all in close fit with the compression cavity; a transmission cavity is formed in the outer shell, and a transmission component is arranged in the transmission cavity. The transmission component includes a first gear fixedly coaxially connected with the rotating rod, and a second gear meshes with the first gear; the second gear is fixedly welded coaxially with a transmission rod. The transmission rod is rotatably connected to the inside of the outer shell. The transmission rod extends into the interior of any one of the channels, and a fan blade is arranged on the side wall of the transmission rod extending into the interior of the channel; the compression cavity is communicated with a test cavity, and a test component is arranged inside the test cavity. The test cavity is communicated with the first pump component. Check valves are arranged at the communication places between the test cavity and the collection hole and the compression cavity. The control system controls the first pump component to extract external gas through the collection hole according to the volume and position of the target food.

[0011] Further, the control system includes a camera and a controller; the camera is used to collect image information on the side of the outer shell close to the collection hole; the controller is used to receive the 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, and control the first pump component and the throttle valve to work according to the position of the target food. After the air barrier inclines to the central position of the target food in the image information, the first pump component and the throttle valve are controlled to work again to adjust the size of the barrier 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, calculate the content of volatile amino nitrogen of the target food in combination with the volume size of the target food, and control the communication module to output the content of volatile amino nitrogen to the user.

[0012] Further, the control system further includes an infrared detector. The infrared detector is used to collect temperature information at multiple angles on the side of the outer shell close to the collection hole. The controller controls the first pump component and the throttle valve to adjust the size and inclination position of the air barrier according to the temperature information, and controls the communication module to work according to the temperature information.

[0013] Further, the control system further includes a humidity sensor for collecting humidity information of the environment. The controller obtains the target food temperature based on the temperature information, obtains the spoilage characteristics of the target food based on the image information, and establishes the correlations between time, humidity information, temperature information, spoilage characteristics and the content of volatile basic nitrogen. Based on these correlations, the controller predicts the curve of the content of volatile basic nitrogen of the target food and the corresponding spoilage characteristics. The controller is configured to control the communication module to alarm the user when the content of volatile basic nitrogen and the spoilage characteristics reach the spoilage standard.

[0014] Further, the controller is further configured to generate a bar code based on the curve of the content of volatile basic nitrogen and the spoilage characteristics, and control the communication module to work to output the corresponding bar code to the user.

[0015] Further, the camera is further configured to collect a bar code image. The controller is further configured to obtain the corresponding predicted spoilage characteristics based on the bar code image and the real-time time, obtain the real-time spoilage characteristics based on the real-time collected image information, calculate the correlation between the real-time spoilage characteristics and the predicted spoilage characteristics. When the similarity is greater than a preset value, the controller controls the communication module to output the predicted content of volatile basic nitrogen to the user. When the similarity is less than or equal to the preset value, the controller controls the first pump assembly and the throttle valve to work.

[0016] Further, it includes a secondary detection component. The secondary detection component includes an ammonia nitrogen sensor and a reaction chamber opened inside the housing. The second pump assembly is communicated with the reaction chamber, and a first solenoid valve is provided at the communication part between the second pump assembly and the reaction chamber, and a second solenoid valve is provided at the communication part between the second pump assembly and the test chamber; the reaction chamber is communicated with a storage chamber, and a fourth solenoid valve and a flow sensor are provided at the communication part. The flow sensor is configured to collect the flow information of the fluid passing through the communication part between the storage chamber and the reaction chamber. A buffer liquid is provided in the storage chamber, and the buffer liquid is used to react with volatile amino acids. The ammonia nitrogen sensor is configured to obtain the ammonia nitrogen content information of the buffer solution in the reaction chamber. The controller is further configured to control the first solenoid valve and the fourth solenoid valve to work based on the content information of volatile basic nitrogen, and control the second solenoid valve to work based on the ammonia nitrogen content information and the flow information. The controller is further configured to judge the accuracy of the content information of volatile basic nitrogen based on the ammonia nitrogen content information and the flow information, and control the communication module to output the judgment result to the user.

[0017] Further, a plurality of one-way teeth are provided on the side wall of the storage chamber, and a second sealing cushion layer is slidably fitted on the side wall of the storage chamber. A plurality of heavy objects are provided on the side of the second sealing cushion layer away from the reaction chamber.

[0018] The technical principle and beneficial effects of the above solution:

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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

[0023] Figure 1 Isometric view of the embodiment of the rapid freshness detection device for animal-derived food of the present invention;

[0024] Figure 2 Front view of the embodiment of the rapid freshness detection device for animal-derived food of the present invention;

[0025] Figure 3 Side view of the embodiment of the rapid freshness detection device for animal-derived food of the present invention;

[0026] Figure 4 Is Figure 2 Sectional view A-A in

[0027] Figure 5 Is Figure 3 Sectional view B-B in

[0028] Figure 6 Is Figure 3 Sectional view C-C in

[0029] Figure 7 Is Figure 4 Enlarged view at D in

[0030] Figure 8 Schematic circuit diagram of the embodiment of the rapid freshness detection device for animal-derived food of the present invention.

[0031] Reference numerals in the accompanying drawings of the specification include: 1, housing; 2, receiving component; 21, compression chamber; 22, rotating rod; 23, compression plate; 231, first sealing cushion; 24, spring; 25, test chamber; 26, transmission component; 261, first gear; 262, second gear; 263, transmission rod; 264, fan blade; 27, collection hole; 3, shielding component; 31, channel; 32, adjusting tube; 33, strip hole; 34, connecting plate; 341, opening; 4, secondary detection component; 41, reaction chamber; 42, storage chamber; 43, one-way tooth; 44, heavy object; 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 implementation manners

[0032] Next, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The following is a further detailed description through specific embodiments:

[0036] Embodiment 1:

[0037] As shown in the attached Figure 1 - attached Figure 8 figures: A rapid freshness detection device for animal-derived foods, including a housing 1. Inside the housing 1, there is a test component and a communication module. In this embodiment, the test component is a quartz crystal microbalance gas sensor 5. There is also a shielding component 3 and a receiving component 2 inside the housing 1. The shielding component 3 is used to eject a fluid to form an air barrier to the outside. The shielding component 3 includes a first pump component 11 and a number of strip-shaped holes 33 opened on the housing 1. In this embodiment, the first pump component 11 is a first air pump. In this embodiment, the strip-shaped holes 33 are arranged in a circumferential array along the center of the receiving component 2 at the bottom of the housing 1. The air pump is connected by a pipeline to a number of channels 31, and a throttle valve is provided at one end of each channel 31 connected to the pipeline. The other ends of the channels 31 are all connected to the adjacent strip-shaped holes 33. An adjusting tube 32 is provided inside the channels 31. The cross-section of the adjusting tube 32 is trapezoidal, and the side wall of the adjusting tube 32 is slidably matched with the channels 31. The adjusting tube 32 is in a floating state inside the channels 31, and an elastic material connecting plate 34 is adhesively fixed to one end of the adjusting tube 32 close to the inside of the channels 31. One side of the adjusting tube 32 close to the connecting plate 34 is hinged to the channels 31 (as shown by the dotted line position in Figure 7 , which is the position of the hinge axis). An opening 341 is opened on the connecting plate 34 on the side away from the center point of the housing 1. The opening 341 is squeezed and closed in the undeformed state of the connecting plate 34.

[0038] The receiving component 2 is used to collect the volatile amino nitrogen generated by the target food. The receiving component 2 includes a collection hole 27 opened on the side wall of the housing 1 close to the strip hole 33. The center of the circle of the collection hole 27 is located at the central position of the bottom of the housing 1. The collection hole 27 communicates with a compression chamber 21. The compression chamber 21 is located inside the housing 1. A rotating rod 22 is rotatably connected in the compression chamber 21. A limiting component is arranged on the rotating rod 22, and the limiting component is used to limit the one-way rotation of the rotating rod 22.

[0039] Combined Figure 4 As shown, several compression plates 23 are slidably fitted to the inner bottom of the compression chamber 21. The compression plates 23 are circumferentially distributed along 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 far from the compression plate 23 is fixedly connected to the rotating rod 22. A first sealing cushion layer 231 is fixedly connected to the side wall of the compression plate 23 on the opposite side where the spring 24 is installed, and the first sealing cushion layer 231 is closely attached to the compression chamber 21.

[0040] A transmission chamber is opened inside the housing 1, and a transmission component 26 is arranged in the transmission chamber. In this embodiment, the transmission component 26 includes a first gear 261 fixedly coaxially connected with the rotating rod 22, and a second gear 262 is meshed with the first gear 261. The second gear 262 is coaxially welded and fixed with a transmission rod 263. The transmission rod 263 is rotatably connected to the inside of the housing 1. The transmission rod 263 extends into the interior of any one of the channels 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 the stable transmission of the first gear 261 and the second gear 262), and a fan blade 264 is arranged on the side wall of the transmission rod 263 extending into the interior of the channel 31.

[0041] In this embodiment, the limiting component includes a ratchet wheel 6 located in the transmission chamber. The ratchet wheel 6 is fixedly coaxially connected with the rotating rod 22. A pawl 7 is hinged to the inner side wall of the transmission chamber. The ratchet wheel 6 is meshed with the pawl 7, and a torsion spring is arranged at the hinge of the pawl 7 and the inner side wall of the transmission chamber. 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 chamber.

[0042] The output end of the compression chamber 21 communicates with a test chamber 25. A test component is arranged inside the test chamber 25. The test chamber 25 communicates with a second pump component 12. In this embodiment, the second pump component 12 is an air pump with a negative pressure function. One-way valves are arranged at the communication parts of the test chamber 25 and the collection hole 27 with the compression chamber 21 to ensure that the outside air flows from the collection hole 27 through the compression chamber 21 to the test chamber 25, and the test component is used to detect the content of volatile amino nitrogen inside the test chamber 25.

[0043] It further 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-shaped hole 33 by bolts, and the camera 10 is used to collect image information on the side of the housing 1 near the collection hole 27; the throttle valve, the first pump assembly 11, the second pump assembly 12, the communication module, the quartz crystal microbalance gas sensor 5 and the camera 10 are all signal-connected to the controller. The controller is used to receive the 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 assembly 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, and then control the first pump assembly 11 and the throttle valve to work again to 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, 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.

[0044] The specific implementation process is as follows: When using this device, align the side of this device with the strip-shaped hole 33 towards the target food, start this device, the camera 10 continuously collects the image information of the position where the target object is located, the user inputs the target information containing the target food into the controller to select the corresponding target food, and then the controller extracts the features of the image information to obtain the size of the target food and its relative distance from the strip-shaped hole 33.

[0045] The controller controls the air pump to operate according to the position of the target food, adjusts the opening degree of the throttle valve, pumps high-pressure gas into the corresponding channel 31. Under the action of the high-pressure gas, the connecting plate 34 deforms, so that the opening 341 is opened, and part of the high-pressure gas is transported to the side wall of one side of the regulating pipe 32 through the opening 341. Under the action of the impact force of the high-pressure gas, the regulating pipe 32 is pushed to tilt at a certain angle. Due to the trapezoidal cross-section design of the regulating pipe 32, the length of the gas increases as the distance between it and the housing 1 increases when the gas passes through the regulating pipe 32, so that the layers formed by the air output from adjacent strip-shaped holes 33 can overlap, and the air output from each strip-shaped hole 33 combines with the device to form a relatively closed air barrier in a cylindrical or frustum shape (when the regulating pipe 32 is tilted).

[0046] In the initial stage of the device operation, the controller adjusts the opening degree of the throttle valve to cause the maximum deformation of the connecting plate 34, so that the opening 341 remains in the maximum opening state. The high-pressure gas acting on one side wall of the regulating pipe 32 causes each regulating pipe 32 to incline towards the center to the greatest extent, forming a minimum intersection area. Subsequently, the opening degree of the throttle valve is gradually adjusted to gradually reduce the deformation of the connecting plate 34 and gradually reduce the opening state of the opening 341; thereby gradually expanding the air barrier. During the gradual expansion of the air barrier, the high-pressure air flow can expel the gas on the surface of the target food.

[0047] The user makes a preliminary judgment on the minimum intersection area according to the changes in the external environment around the air barrier (such as the depression of the food packaging bag at a certain place under the action of wind, or the position where the liquefied water vapor on the surface of the frozen food moves rapidly), and adjusts the position of the device to roughly move the minimum intersection area onto the target food, and then gradually expand the air barrier.

[0048] In this embodiment, after the controller roughly moves the air minimum intersection area of the air barrier in the image information onto the target food according to the image information, the relative position relationship between the target food and the strip hole 33 is obtained according to the image information, and the corresponding throttle valve is controlled to work to adjust the flow rate of the gas flowing out of the channel 31.

[0049] For example, if it is necessary to make the air barrier incline to one side, the corresponding throttle valve is controlled to work to adjust the flow rate of the gas flowing out of the channel 31, so that the flow rate of a part of the channel 31 increases and the flow rate of a part of the channel 31 decreases. Then, the controller increases the working power of the air pump. In the channel 31 with an increased flow rate, the impact force of the high-pressure gas acting on the connecting plate 34 in the channel 31 with an increased flow rate will also increase accordingly, thereby increasing the deformation of the connecting plate 34 and increasing the opening size of the opening 341. Part of the high-pressure gas acts on one side wall of the regulating pipe 32, pushing the regulating pipe 32 to incline towards the center area at the bottom of the housing 1, so that the inclination angle of the air flow output from the strip hole 33 towards the center area at the bottom of the housing 1 increases. In the channel 31 with a decreased flow rate, the impact force acting on the corresponding connecting plate 34 decreases, thereby reducing the deformation of the connecting plate 34 and reducing the opening size of the opening 341. The high-pressure gas acting on one side wall of the regulating pipe 32 decreases, and the regulating pipe 32 gradually resets or always remains parallel to the channel 31, so that the inclination angle of the air flow output from the strip hole 33 towards the center area at the bottom of the housing 1 decreases. Thereby adjusting the inclination position of the air barrier to more accurately cover the area to be detected of the food.

[0050] Subsequently, the controller controls the operation of the second pump assembly 12 to continuously suck the gas inside the air barrier through the collection hole 27. Meanwhile, due to the flow of the gas in the channel 31, the gas drives the movement of the fan blade 264. The fan blade 264 drives the movement of the compression plate 23 through the rotating rod 22. The compression plate 23 drives the gas in the compression chamber 21 through the first sealing cushion layer 231. As the compression plate 23 moves, the volume of the gas in the compression chamber 21 gradually decreases. After the compression plate 23 moves to a suitable position, the compressed gas enters the test chamber 25.

[0051] The quartz crystal microbalance gas sensor 5 continuously collects the content of volatile amino nitrogen 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 content of volatile amino nitrogen and the volume of the test chamber 25. At the same time, it judges the type and approximate volume of the detected food according to the image information, obtains the average density of this type of food through the food type. For example, the average density of fish is A grams per cubic centimeter. The approximate weight of the food can be obtained through the average density and the approximate volume. According to the approximate weight of the food and the increment of volatile amino nitrogen detected, the mass ratio of volatile amino nitrogen of this food is calculated. Subsequently, the controller controls the communication module to output the mass ratio of volatile amino nitrogen of the target food, that is, the content of volatile amino nitrogen, to complete a test. The user can make a certain judgment on the freshness of the food according to the increment of volatile amino acids. The scheme of using the mass ratio can correspond to the national standard compared with the scheme of directly using the volume ratio, which is convenient for the operator to judge the freshness of the target food without the operator conducting corresponding experiments according to the device data to obtain the corresponding data reference, which helps to reduce the R & D cost of this device. And since no new unit is used, it also helps to improve the acceptance of the existing food freshness detection personnel, thus contributing to the subsequent promotion of the product.

[0052] Embodiment 2:

[0053] The difference from Embodiment 1 is that the control system further includes an infrared detector 9. The infrared detector 9 is used to collect the temperature information at multiple angles on the side of the housing 1 where the collection hole 27 is provided. The infrared detector 9 is fixedly connected to the side wall of the housing 1 close to the strip hole 33 by bolts. At the same time, the infrared detector 9 is connected to the controller in a model manner. The controller adjusts the size and tilt position of the barrier according to the temperature information based on the temperature information by controlling the first pump assembly 11 and the throttle valve.

[0054] The specific implementation process is as follows: During the use of this device, the infrared detector 9 continuously collects the temperature information on the side of the housing 1 close to the collection hole 27. As the device operates, the heat generated during the operation of each component inevitably transfers into the channel 31 and flows out of the device along with the gas. Therefore, in the temperature information, there will be a certain difference between the temperature at the position of the air barrier and the surrounding temperature, and this numerical difference shows an increasing trend as the distance from the device decreases. That is, by collecting temperature information from multiple angles, the angles between each air barrier and the side wall of the housing 1 can be obtained, and through this angle, the size and position of the air barrier can be judged more accurately, enabling the controller to make more accurate adjustments in combination with the image information and improving the accuracy of this solution. Subsequently, the controller controls the communication module to work and outputs the temperature information to the user to help the user judge the environmental temperature, which is beneficial to reducing the risk of subsequent food spoilage.

[0055] At the same time, by using the infrared detector 9, the temperature of frozen food can also be preliminarily collected. When the target food is lower than the set temperature, then the food is frozen food. As the test progresses, if the temperature increment of the target food per unit time is greater than the preset increment, then the target food may be thawed or in other situations. At this time, the controller controls the communication module to work and sends an alarm message to the user, prompting the user to promptly conduct a check and further detection of the target food to avoid further aggravation of thawing and causing irreparable economic losses.

[0056] Embodiment 3:

[0057] The difference from Embodiment 2 is that the control system further includes a humidity sensor 8. The humidity sensor 8 is fixedly connected to the side wall of the housing 1 by bolts. The humidity sensor 8 is used to collect the humidity information of the environment. The humidity sensor 8 is signal-connected to the controller. The controller obtains the temperature of the target food based on the temperature information, obtains the spoilage characteristics of the target food based on the image information, and establishes the association between time, humidity information, temperature information, spoilage characteristics, and the content of volatile basic nitrogen. Based on this association, the curve of the content of volatile basic nitrogen and the corresponding spoilage characteristics of the target food are predicted. The controller is used to control the communication module to alarm the user when the content of volatile basic nitrogen and the spoilage characteristics reach the spoilage standard. The controller is also used to generate a barcode based on the curve of the content of volatile basic nitrogen and the spoilage characteristics, and control the communication module to work and output the corresponding barcode to the user;

[0058] The camera 10 is also used to collect bar code images, and the controller is also used to obtain corresponding predicted spoilage characteristics according to the bar code images and the real-time time, and obtain real-time spoilage characteristics according to the real-time collected image information, calculate the correlation between the real-time spoilage characteristics and the predicted spoilage characteristics. When the similarity is greater than a preset value, the communication module is controlled to output the predicted volatile basic nitrogen content to the user. When the similarity is less than or equal to the preset value, the first pump assembly 11 and the throttle valve are controlled to work.

[0059] The specific implementation process is as follows: During the use of this device, the humidity sensor 8 continuously collects the humidity information of the environment. At the same time, the controller obtains the spoilage characteristics of the target food according to the image information. The spoilage characteristics mainly include the size, shape, type, color, surface morphology of the target food (such as whether there are mildew spots, the position of the mildew spots, the size of the mildew spots, the color of the mildew spots, etc.). An association is constructed between these spoilage characteristics, temperature information, humidity information and the volatile basic nitrogen content at the corresponding time points. Using this association, the influence of different influencing factors on the generation amount of volatile basic nitrogen and spoilage characteristics can be obtained, so as to predict the change curve of the volatile basic nitrogen content of the target food within a certain period of time and the spoilage characteristics that change following this change curve. And according to the change curve of the volatile basic nitrogen content and the spoilage characteristics, when the time point when the predicted volatile basic nitrogen content first exceeds the spoilage standard of the corresponding food and the mildew spots first appear in the spoilage characteristics (that is, when the volatile basic nitrogen content and the spoilage characteristics reach the spoilage standard), the communication module is controlled to alarm the user. For example, for a certain target food, the spoilage characteristics in the initial state are normal color without mildew spots, and at this time the volatile basic nitrogen content is a. Under the condition that the temperature and humidity conditions remain unchanged, according to the association between the time corresponding to the food of this size, shape and type and the volatile basic nitrogen content, after b hours, the content of volatile basic nitrogen increases by c, and c is the minimum value for the food of this size, shape and type to reach the spoilage standard. At this time, a mildew spot appears on the surface of the target food, that is, at the time point b hours after the initial time, the controller controls the communication module to alarm the user, prompting the user that the food may be spoiled at this time, and prompting the user to go for a second inspection, reducing the time cost and inspection cost brought by regular repeated inspections.

[0060] After obtaining the volatile basic nitrogen content curve of the target food and the corresponding spoilage characteristics, the controller generates a barcode based on the above content. The user can print and paste it on the corresponding target food for marking, reducing the occurrence of duplicate inspections during subsequent inspections, avoiding waste of time and inspection costs. At the same time, operators without this device can also obtain the volatile basic nitrogen content curve of the target food and the corresponding spoilage characteristics by scanning the barcode. Then, according to the initial time and the current time, the corresponding predicted volatile basic nitrogen content and the corresponding spoilage characteristics are read. When the spoilage characteristics are the same as those predicted at this time point observed by the operator with the naked eye, the curve prediction is relatively accurate, and the operator can use the predicted volatile basic nitrogen content as the criterion for judging the freshness of the target food. If the spoilage characteristics observed by the operator with the naked eye are different from the predicted spoilage characteristics, there is an error in the curve prediction result. At this time, there is an error in the volatile basic nitrogen content predicted by the curve, and the operator needs to re-detect the volatile basic nitrogen of the target food. Using this solution can further reduce the inspection cost. At the same time, because barcode reading has low requirements for equipment, the operator can use other cheaper equipment for reading, reducing the inspection cost during multi-person inspections.

[0061] During the subsequent re-inspection of the food, the operator can use the camera 10 to scan the barcode. The controller obtains the volatile basic nitrogen content curve of the corresponding food and the corresponding spoilage characteristics according to the barcode. Subsequently, the controller obtains the predicted volatile basic nitrogen content and the corresponding spoilage characteristics at this time point according to the real-time time when the barcode is scanned. Then, the image information of the target video is collected through the camera 10, the real-time spoilage characteristics are obtained according to the image information, and the similarity between the real-time spoilage characteristics and the predicted spoilage characteristics is calculated. When the similarity is greater than the preset value, the controller controls the communication module to output the predicted volatile basic nitrogen content to the user. If the similarity is less than or equal to the preset value, the controller controls the first pump assembly 11 and the throttle valve to work to collect the volatile basic nitrogen content of the target food again. When facing operators equipped with this device, this solution can greatly reduce the workload of the operators, shorten the operation time, and reduce the operation difficulty 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 brought by visual comparison and improve the accuracy of judgment.

[0062] Example 4:

[0063] The difference from Embodiment 3 is that it further includes a secondary detection component 4. The secondary detection component 4 includes an ammonia nitrogen sensor and a reaction chamber 41 opened inside the housing 1. The second pump assembly 12 is communicated with the reaction chamber 41. A first electromagnetic valve 101 is provided at the connection between the second pump assembly 12 and the reaction chamber 41, and a second electromagnetic valve 102 is provided at the connection between the second pump assembly 12 and the test chamber 25. In this embodiment, the second pump assembly 12 is a negative-pressure and positive-pressure dual-purpose air pump; a third electromagnetic valve 103 is provided at the connection between the test chamber 25 and the reaction chamber 41. The reaction chamber 41 is communicated with a storage chamber 42, and a fourth electromagnetic 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 the 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 liquid is a buffer solution composed of pure water, weak acid salts, and weak base salts. At the same time, the buffer liquid can also be liquids such as water and organic solvents 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 electromagnetic valve 101, the second electromagnetic valve 102, the third electromagnetic valve 103, the ammonia nitrogen sensor, and the flow sensor are all signal-connected to the controller. 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 further used to control the first electromagnetic valve 101 and the fourth electromagnetic valve to work according to the volatile amino nitrogen content information, and control the second electromagnetic valve 102 to work according to the ammonia nitrogen content information and the flow information. The controller is further 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 work to output the judgment result to the user;

[0064] A plurality of one-way teeth 43 are adhesively fixed to the side wall of the storage chamber 42, and a second sealing cushion layer is slidably fitted to the side wall of the storage chamber 42. A plurality of heavy objects 44 are provided on the side of the second sealing cushion layer away from the reaction chamber 41.

[0065] The specific implementation process is as follows: In the initial state, the controller controls the first electromagnetic valve 101 and the second pump assembly 12 to work, extracts a part of the gas in the reaction chamber 41, and closes the first electromagnetic valve 101 after a certain 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 electromagnetic valve 103, and under the action of air pressure, the gas in the test chamber 25 enters the reaction chamber 41.

[0066] Meanwhile, the controller activates 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. Subsequently, 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, causing the volatile amino nitrogen in the gas to mix with the buffer liquid to form an aqueous solution containing ammonia nitrogen elements. At the same time, the flow sensor continuously collects the flow information of the buffer liquid flowing into the reaction chamber 41, and the controller controls the fourth solenoid valve to operate according to the flow information, so that the buffer liquid enters the reaction chamber 41 intermittently, 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 in the buffer liquid in the reaction chamber 41, that is, the ammonia nitrogen content information. After dropping the buffer solution into the reaction chamber 41 once, after the ammonia nitrogen content information stabilizes, a second drop is carried out again. After the ammonia nitrogen content information stabilizes, if there is no obvious change between the two, then the buffer liquid in the reaction chamber 41 at this time is a saturated solution. Repeat this process until the ammonia nitrogen content information stabilizes and its value is lower than that at the previous drop, that is, the aqueous solution containing ammonia nitrogen elements in the reaction chamber 41 is in an unsaturated state at this time. Obtain the ammonia nitrogen content information and flow information at the previous drop of this drop, calculate the content of ammonia nitrogen elements in the solution, and thus calculate the content of volatile amino nitrogen. Compare this content with the data collected by the quartz crystal microbalance gas sensor 5 for 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 the two test results to the user for prompting, so that the user can analyze or conduct a re-inspection to avoid the problem of misjudgment caused by the data error of a single test.

[0067] The design of the secondary detection component 4 enables the device to perform secondary detection on the sampled gas, improving the accuracy of the test. At the same time, since this solution has no special requirements for the test location and the like, thus, this solution can be carried out on the way to another target food after the operator has detected one target food, reducing the time cost brought by the secondary detection. And as the operator moves, the shaking of the device during the process can also prompt the buffer liquid to combine with the volatile amino nitrogen, reducing the reaction time between the two and improving the efficiency of the secondary detection. At the same time, since this solution requires the combination of the buffer liquid and the volatile amino nitrogen, while detecting the content of the volatile amino nitrogen, it can also absorb and process it to avoid the aggregation of the volatile amino nitrogen inside the device and causing damage to the operator's body during emission.

[0068] During the movement of the operator, due to inertia, the heavy object 44 shakes in the storage cavity 42. During the shaking process, the heavy object 44 pushes the second sealing cushion layer to move towards the reaction cavity 41, pushing the buffer solution and prompting it to enter the reaction cavity 41. Due to the action of the one-way teeth 43, it is difficult for the second sealing cushion layer to move in the opposite direction relying on the pressure of the liquid and gas, thus avoiding sucking the liquid in the reaction cavity 41 and affecting the test accuracy. The design of the heavy object 44 and the like uses inertia to help the buffer liquid enter the reaction cavity 41, avoiding the difficulty of the buffer liquid entering the reaction cavity 41 due to the air pressure inside the reaction cavity 41 and the surface tension of the liquid, which affects the secondary detection, and helps to improve the success rate of the secondary detection.

[0069] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A rapid freshness detection device for animal-derived foods, comprising a housing (1), wherein a test component and a communication module are provided inside the housing (1), and it is characterized in that, A shielding component (3) and a receiving component (2) are also provided inside the housing (1). The shielding component (3) is used to spray fluid to the outside to form an air barrier, and 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 content of volatile amino nitrogen inside the receiving component (2); It also includes a control system. The control system is used to receive the target information input by the user and collect the image information around the housing (1), and obtain the size and position of the target food in the target information according to the image information. According to the position of the target food, the control system controls the shielding component (3) to adjust the inclination position of the air barrier. When the air barrier is at the central position of the target food, according to the size of the target food, the control system controls the shielding component (3) to adjust the coverage area of the barrier until the barrier isolates the target food from non-target foods. Then, it obtains the content of volatile amino nitrogen in the receiving component (2) per unit time, calculates the content of volatile amino nitrogen of the target food in combination with the volume size of the target food, and controls the communication module to output the content of volatile amino nitrogen to the user; The shielding component (3) includes a first pump component (11) and a plurality of strip-shaped holes (33) opened on the housing (1). The first pump component (11) is communicated with a plurality of channels (31), and throttle valves are provided at one ends where the first pump component (11) is communicated with the channels (31). The other ends of the channels (31) are all communicated with adjacent strip-shaped holes (33). An adjusting pipe (32) is provided inside the channels (31). The adjusting pipe (32) is floatingly installed inside the channels (31). The cross-section of the adjusting pipe (32) is trapezoidal, and the side walls of the adjusting pipe (32) are all in sliding fit with the channels (31). A connecting plate (34) made of elastic material is fixedly connected to one end of the adjusting pipe (32) close to the inside of the channel (31). An opening (341) is opened on the connecting plate (34) on the side away from the center point of the side wall of the housing (1) where the strip-shaped hole (33) is provided. The control system is used to control the first pump component (11) and the throttle valve to work according to the volume size and position of the target food.

2. The rapid freshness detection device for animal-derived food according to claim 1, wherein The receiving component (2) includes a collection hole (27) opened on the side wall of the housing (1) close to the strip-shaped hole (33). The collection hole (27) is communicated with a compression cavity (21). A rotating rod (22) is rotatably connected inside the compression cavity (21), and a limiting component is provided on the rotating rod (22); The limiting component is used to limit the one-way rotation of the rotating rod (22). A plurality of compression plates (23) are slidably fitted to the bottom of the compression cavity (21). The compression plates (23) are evenly distributed along the circumferential direction 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 cavity (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 cushion layer (231) is fixedly connected to the side wall of the compression plate (23) on the side opposite to the side where the spring (24) is installed. The first sealing cushion layer (231) is in close fit with the compression cavity (21); A transmission cavity is provided inside the outer shell (1). A transmission component (26) is arranged inside the transmission cavity. The transmission component (26) includes a first gear (261) fixedly coaxially connected with a rotating rod (22). A second gear (262) is meshed with the first gear (261). The second gear (262) is fixedly welded coaxially with a transmission rod (263). The transmission rod (263) is rotatably connected to the inside of the outer shell (1). The transmission rod (263) extends into the inside of any one of the channels (31). A fan blade (264) is arranged on the side wall of the transmission rod (263) extending into the inside of the channel (31). The compression cavity (21) communicates with a test cavity (25). A test component is arranged inside the test cavity (25). The test cavity (25) communicates with the first pump component (11). Check valves are arranged at the communicating places between the test cavity (25) and the collection hole (27) and the compression cavity (21). The control system controls the first pump component (11) to extract external gas through the collection hole (27) according to the volume and position of the target food.

3. The rapid freshness detection device for animal-derived foods according to claim 2, characterized in that, The control system includes a camera (10) and a controller. The camera (10) is used to collect image information on the side of the outer shell (1) close to the collection hole (27). The controller is used to receive the 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, 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 inclines to the central position of the target food in the image information, the first pump component (11) and the throttle valve are controlled to work again to adjust the barrier size until the barrier isolates the target food from the non-target food. The content of volatile basic nitrogen in the receiving component (2) per unit time is obtained, and the volatile basic nitrogen content of the target food is calculated in combination with the volume size of the target food, and the control communication module outputs the volatile basic nitrogen content to the user.

4. The rapid freshness detection device for animal-derived foods according to claim 3, characterized in that, The control system further includes an infrared detector (9). The infrared detector (9) is used to collect temperature information at multiple angles on the side of the outer shell (1) close to the collection hole (27). The controller controls the first pump component (11) and the throttle valve to adjust the size and inclination position of the air barrier according to the temperature information, and controls the communication module to work according to the temperature information.

5. The rapid freshness detection device for animal-derived food according to claim 4, characterized in that, The control system further includes a humidity sensor (8). The humidity sensor (8) is used to collect the humidity information of the environment. The controller obtains the temperature of the target food according to the temperature information, obtains the spoilage characteristics of the target food according to the image information, and establishes the association between time, humidity information, temperature information, spoilage characteristics and the content of volatile basic nitrogen. The volatile basic nitrogen content curve and the corresponding spoilage characteristics of the target food are predicted according to this association. The controller is used to control the communication module to alarm the user when the volatile basic nitrogen content and the spoilage characteristics reach the spoilage standard.

6. The rapid freshness detection device for animal-derived food according to claim 5, characterized in that, The controller is further used to generate a barcode according to the volatile basic nitrogen content curve and the spoilage characteristics, and control the communication module to work to output the corresponding barcode to the user.

7. The rapid freshness detection device for animal-derived food according to claim 6, wherein The camera (10) is also used to collect bar code images. The controller is also used to obtain the corresponding predicted spoilage characteristics according to the bar code images and the real-time time, and obtain the real-time spoilage characteristics according to the real-time collected image information. The controller calculates the correlation between the real-time spoilage characteristics and the predicted spoilage characteristics. When the similarity is greater than a preset value, the controller controls the communication module to output the predicted volatile basic nitrogen content to the user. When the similarity is less than or equal to the preset value, the controller controls the first pump assembly (11) and the throttle valve to work.

8. The rapid freshness detection device for animal-derived food according to claim 7, characterized in that, It includes a secondary detection component (4). The secondary detection component (4) includes an ammonia nitrogen sensor and a reaction chamber (41) opened inside the housing (1). The second pump assembly (12) is communicated with the reaction chamber (41), and a first electromagnetic valve (101) is provided at the communication part between the second pump assembly (12) and the reaction chamber (41). A second electromagnetic valve (102) is provided at the communication part between the second pump assembly (12) and the test chamber (25). The reaction chamber (41) is communicated with a storage chamber (42), and a fourth electromagnetic valve and a flow sensor are provided at the communication part. The flow sensor is used to collect the flow information of the fluid passing through the communication part 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 the ammonia nitrogen content information of the buffer solution in the reaction chamber (41). The controller is also used to control the first electromagnetic valve (101) and the fourth electromagnetic valve according to the volatile basic nitrogen content information, and control the second electromagnetic 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 basic 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.

9. The rapid freshness detection device for animal-derived food according to claim 8, wherein, A plurality of one-way teeth (43) are provided on the side wall of the storage chamber (42), and a second sealing cushion layer is slidably matched with the side wall of the storage chamber (42). A plurality of heavy objects (44) are provided on the side of the second sealing cushion layer away from the reaction chamber (41).

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