Mobile sample preparation equipment for food inspection and detection

Abstract

The invention discloses food inspection and detection mobile sample preparation equipment, and relates to the technical field of food safety detection, the food inspection and detection mobile sample preparation equipment comprises a crushing tank and a subpackaging box, one end of the subpackaging box far away from the crushing tank is provided with an extraction mechanism for extraction and solid-liquid separation and a solid-liquid separation mechanism, and the crushing tank is also provided with a disinfection and cleaning mechanism for disinfection and cleaning; a control body used for monitoring and controlling is installed on the subpackaging box, a smashing roller used for smashing samples is further installed on the smashing tank, a sample containing hopper used for containing food samples is further installed at the top end of the smashing tank, a subpackaging cavity is formed in the subpackaging box, and a subpackaging channel is further formed in the subpackaging box. Through the full-process automatic structural design integrating crushing, split charging, extraction, solid-liquid separation and disinfection cleaning, precise regulation and control of the control main body and linkage operation of all parts, the integrated operation of sample feeding and to-be-detected liquid discharging is realized, manual transfer steps are greatly reduced, sample pollution and loss are effectively avoided, and the mobile sample preparation efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of food safety testing technology, specifically to a mobile sample preparation device for food inspection and testing. Background Technology

[0002] Food inspection and testing is a crucial link in ensuring food safety and preventing quality risks, and it is directly related to public health, market order, and sustainable industrial development.

[0003] With the strengthening of food safety supervision and the diversification of testing and inspection needs, on-site rapid testing and mobile sample preparation have become important directions for improving testing efficiency. Especially in scenarios such as agricultural product production areas, food processing enterprises, and sampling inspections in the distribution process, it is necessary to complete sample pretreatment through mobile sample preparation equipment to provide qualified samples for subsequent testing and analysis. Therefore, the convenience and accuracy of mobile sample preparation directly affect the effectiveness of the overall testing and inspection work.

[0004] Mobile sample preparation for on-site food inspection and testing mainly relies on "vehicle-mounted pretreatment boxes," whose core configuration is mostly a combination of a simple grinder, a manual balance, and a separating funnel, which can only meet basic sample preparation needs. In actual operation, the complete sample preparation process requires completing key steps such as grinding, weighing, adding liquid, extraction, and solid-liquid separation in sequence. Each step requires manual transfer of samples or materials between different devices, with a cumulative transfer of more than 5 times. This is inefficient and prone to sample contamination and loss due to repeated manual transfers. Furthermore, the dispensing and weighing of materials in existing vehicle-mounted pretreatment boxes are mainly done by manual balances. However, the sample preparation environment for on-site inspection is mostly in mobile vehicles (such as testing vehicles). Bumps and shaking are inevitable during vehicle movement. The weighing accuracy of manual balances depends on a stable operating environment. Under bumpy conditions, it is difficult to ensure weighing stability, which can easily lead to large material weighing errors. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a mobile sample preparation device for food inspection and testing. The problem it aims to solve is that the existing mobile sample preparation for food inspection and testing relies on a "vehicle-mounted pretreatment box", the core of which is a combination of a simple grinder, a manual balance and a separating funnel. Sample preparation requires multiple steps such as grinding and weighing, and manual transfer more than 5 times. This not only results in low operating efficiency, but also easily leads to sample contamination and loss. At the same time, the manual balance is difficult to guarantee weighing stability in the bumpy environment of the vehicle, resulting in large material weighing errors.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a mobile sample preparation device for food inspection and testing, comprising a crushing tank and a dispensing box, wherein the dispensing box is provided with an extraction mechanism and a solid-liquid separation mechanism for extraction and solid-liquid separation at one end away from the crushing tank, the crushing tank is also provided with a disinfection and cleaning mechanism for disinfection and cleaning, and a control unit for monitoring and control is installed on the dispensing box;

[0008] The bottom of the crushing tank is provided with a discharge hopper that communicates with the dispensing box. The crushing tank is also equipped with a crushing roller for crushing samples, and the top of the crushing tank is also equipped with a sample hopper for placing food samples.

[0009] The dispensing box has a funnel-shaped dispensing cavity, and the dispensing box also has symmetrical dispensing channels that communicate with the dispensing cavity. A conical guide seat is fixedly installed at the bottom of the dispensing cavity and between the dispensing channels. A material separator seat adapted to the dispensing cavity is movably connected in the dispensing cavity, and the material separator seat is rotatably connected in the dispensing cavity through an intermittent deflection mechanism.

[0010] The material separator seat has inclined dispensing slopes, and symmetrically distributed guide plates are fixedly installed along the dispensing slopes of the material separator seat. The material separator seat and the conical guide seat are arranged to avoid each other.

[0011] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing described in this invention, the dispensing chamber is further provided with a transition chamber opposite to the dispensing chamber, the dispensing chamber is provided with a cleaning channel communicating with the transition chamber, and a material gathering hopper corresponding to the discharge hopper is fixedly installed at one end of the transition chamber near the crushing tank.

[0012] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing according to the present invention, the intermittent deflection mechanism includes a main rotating shaft rotatably connected to the dispensing box via a bearing. One end of the main rotating shaft located in the dispensing cavity is fixedly connected to a material separator seat. A fan-shaped frame is fixedly installed at one end of the main rotating shaft extending into the dispensing box. An arc-shaped groove for limiting the sliding of the arc-shaped toothed ring is provided on the fan-shaped frame, and limiting blocks for restricting the sliding of the arc-shaped toothed ring are also fixedly installed at both ends of the arc-shaped groove on the fan-shaped frame.

[0013] A connecting rod is also movably connected to the sector frame. The other end of the connecting rod is hinged to a power arm driven by a servo motor. The servo motor is embedded in the sub-packing box, and the output shaft of the servo motor is connected to the end of the power arm away from the connecting rod.

[0014] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing described in this invention, the intermittent deflection mechanism further includes a stirring rack installed on the dispensing box. A driven gear is fixedly installed at one end of the stirring rack extending outside the dispensing box. The driven gear meshes with an arc-shaped gear ring. A driven stirring rod is provided at one end of the stirring rack located in the transition cavity, and the driven stirring rod is rotatably connected to the transition cavity through the driven gear.

[0015] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing according to the present invention, the extraction mechanism includes an extraction hopper corresponding to the dispensing channel. The extraction hopper is connected to the dispensing channel through a telescopic joint. The extraction hopper is provided with a settling tube and a clarifying tube respectively. The aperture of the settling tube is larger than that of the clarifying tube.

[0016] An electronic weighing unit for weighing is also provided outside the extraction hopper. The electronic weighing unit is connected to the control body via wires and is installed below the dispensing box via a buffer pressure push rod frame.

[0017] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing described in this invention, the extraction mechanism further includes an extraction liquid storage tank and a water tank fixedly installed on the dispensing box. The extraction liquid storage tank is equipped with a liquid addition pipe connected to the extraction bucket, and the water tank is equipped with a water addition pipe connected to the extraction bucket. Both the liquid addition pipe and the water addition pipe are equipped with electromagnetic flow valves controlled by the control body.

[0018] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing according to the present invention, the solid-liquid separation mechanism includes a separation bucket fixedly installed on the extraction bucket, a filtrate chamber for collecting the test liquid is provided in the separation bucket, a test liquid outlet connected to the filtrate chamber is also provided on the separation bucket, and a slag collection tank corresponding to the sedimentation tube is detachably installed on the separation bucket, and a filter tank for filtering out the test liquid is provided on the slag collection tank.

[0019] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing according to the present invention, the disinfection and cleaning mechanism is composed of a temperature control component for temperature control and a steam sterilization component for steam sterilization. The temperature control component includes an airflow channel fixedly installed on the grinding tank. An electric heating temperature control ring connected to the control body is provided on the airflow channel. A purification filter element is fixedly installed at one end of the airflow channel extending outside the grinding tank. An air pump is provided at one end of the airflow channel near the grinding tank.

[0020] As a preferred embodiment of the mobile sample preparation equipment for food inspection and testing according to the present invention, the steam sterilization component includes a steam tank fixedly installed on the grinding tank, the steam tank is provided with a steam pipe, one end of the steam pipe located in the dispensing channel is connected to the transition chamber, and a booster pump is installed at one end of the steam pipe extending into the grinding tank.

[0021] In summary, the present invention has at least one of the following beneficial effects:

[0022] 1. This invention, through the integrated automated structure design of crushing, dispensing, extraction, solid-liquid separation, disinfection and cleaning, combined with the precise control of the main control unit and the coordinated operation of various components, realizes the integrated operation of "sample in, test liquid out", which greatly reduces the manual transfer steps, effectively avoids sample contamination and loss, and significantly improves the efficiency of mobile sample preparation.

[0023] 2. This invention solves the weighing error problem of existing manual balances in mobile environments by equipping the extraction hopper with an electronic weighing unit, using a buffer pressure push rod frame with built-in shock-absorbing springs and hydraulic dampers to offset vehicle bumps and vibrations, and combining it with an electromagnetic flow valve to accurately control the liquid-solid ratio.

[0024] 3. This invention, through the coordinated operation of the ventilation temperature control component and the steam sterilization component, achieves preheating sterilization before equipment use, automatic rinsing after use, high-temperature and high-pressure all-round sterilization, and hot air drying, ensuring the cleanliness of the sample preparation process and the reliability of the test results. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a front view of the present invention.

[0027] Figure 2 This is a perspective view of the rear side of the present invention;

[0028] Figure 3 This is a cross-sectional view of the present invention;

[0029] Figure 4 This is a structural diagram showing the assembly of the pulverizing tank and the disinfection and cleaning mechanism of the present invention.

[0030] Figure 5 This is a cross-sectional view of the assembly of the dispensing box and the extraction mechanism of the present invention.

[0031] Figure 6This is a structural diagram of the intermittent deflection mechanism of the present invention;

[0032] Figure 7 This is a cross-sectional view of the extraction mechanism and solid-liquid separation mechanism of the present invention in conjunction with each other.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Crushing tank; 11. Discharge hopper; 12. Crushing roller; 13. Feeding hopper; 2. Packing box; 21. Packing cavity; 211. Packing channel; 212. Conical guide seat; 213. Material separator; 2131. Guide plate; 22. Transition cavity; 221. Cleaning channel; 222. Gathering hopper; 3. Intermittent deflection mechanism; 31. Main shaft; 311. Fan-shaped frame; 3111. Limiting block; 312. Arc-shaped gear ring; 313. Connecting rod; 314. Power arm; 315. Servo motor; 32. Stirring frame; 321. Driven gear; 322. Driven stirring rod; 4. Extraction mechanism; 41. Extraction hopper; 411 412. Expansion joint; 413. Settling pipe; 414. Clarifying pipe; 42. Electronic weighing unit; 43. Extraction liquid storage tank; 431. Liquid addition pipe; 44. Clear water tank; 441. Water addition pipe; 5. Solid-liquid separation mechanism; 51. Separation hopper; 511. Filtration chamber; 5111. Test liquid outlet; 52. Slag collection tank; 521. Filter tank; 6. Disinfection and cleaning mechanism; 61. Air circulation temperature control component; 611. Airflow channel; 6111. Electric heating temperature control ring; 612. Purification filter element; 613. Air pump; 62. Steam disinfection component; 621. Steam tank; 622. Steam pipe; 623. Booster pump; 7. Control unit. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention discloses a mobile sample preparation device for food inspection and testing.

[0037] Example 1

[0038] Reference Figure 1-7This invention provides a mobile sample preparation device for food inspection and testing, comprising a pulverizing tank 1 and a dispensing box 2. The dispensing box 2, located away from the pulverizing tank 1, is equipped with an extraction mechanism 4 and a solid-liquid separation mechanism 5 for extraction and solid-liquid separation. The pulverizing tank 1 is also equipped with a disinfection and cleaning mechanism 6 for disinfection and cleaning. A control unit 7 for monitoring and control is installed on the dispensing box 2. The bottom of the pulverizing tank 1 is equipped with a discharge hopper 11 connected to the dispensing box 2. A pulverizing roller 12 for pulverizing samples is also installed on the pulverizing tank 1. The top of the pulverizing tank 1... It is also equipped with a sample hopper 13 for placing food samples. The dispensing box 2 has a funnel-shaped dispensing cavity 21. The dispensing box 2 also has symmetrical dispensing channels 211 connected to the dispensing cavity 21. A conical guide seat 212 is fixedly installed at the bottom of the dispensing cavity 21 and between the dispensing channels 211. A material separator seat 213 adapted to the dispensing cavity 21 is movably connected in the dispensing cavity 21. The material separator seat 213 is rotatably connected in the dispensing cavity 21 through an intermittent deflection mechanism 3. The material separator seat 213 has inclined dispensing slopes. The material separator seat 213 is fixed along its dispensing slopes. The symmetrically distributed guide plates 2131 are installed, and the material separator 213 and the conical guide seat 212 are arranged to avoid each other. The crushing tank 1 and the discharge hopper 11 are integrally formed of food-grade stainless steel to avoid the sample reacting with the metal material and causing contamination. The surface of the crushing roller 12 is provided with spiral crushing teeth, and the two crushing rollers 12 are arranged to rotate in opposite directions. The speed can be adjusted by the control body 7 to meet the crushing requirements of food samples with different hardness, ensuring that the sample particle size is uniform after crushing. The top of the sample hopper 13 is provided with a sealing cover to prevent sample splashing or external impurities from entering during the crushing process, ensuring overall airtightness. The inner wall of the discharge hopper 11 is coated with a polytetrafluoroethylene non-stick coating to prevent sample residue from adhering after crushing. The discharge hopper 11 is also equipped with an electromagnetic valve that is electrically connected to the control body 7, which can precisely control the sample falling speed and discharge volume. The funnel-shaped structure of the dispensing cavity 21 can guide the crushed sample to gather naturally. The cone angle of the conical guide seat 212, together with the inclined dispensing slope of the continuously deflecting separator seat 213, realizes the directional diversion of the sample to the dispensing channel 211. The guide plate 2131 adopts an extended structure and is also coated with a non-stick coating on its surface to further reduce sample residue and ensure dispensing accuracy.

[0039] The dispensing chamber 21 also has a transition chamber 22 opposite to it. The dispensing chamber 21 has a cleaning channel 221 connected to the transition chamber 22. The end of the transition chamber 22 near the crushing tank 1 is fixedly installed with a material hopper 222 corresponding to the discharge hopper 11. The transition chamber 22 is mainly used to receive the crushed samples that are not dispensed in the dispensing chamber 21 in time to prevent them from getting blocked. The cleaning channel 221 is set at an angle downward to ensure that the cleaning liquid or residual samples can flow into the transition chamber 22 naturally without any dead corners. The opening size of the material hopper 222 matches the outlet size of the discharge hopper 11, which not only ensures that the crushed samples can enter the dispensing chamber 21 smoothly, but also receives the cleaning liquid flowing down from the discharge hopper 11 during cleaning, realizing the linkage cleaning of the crushing tank 1 and the dispensing chamber 2, and can prevent the escape of the crushed samples to a certain extent.

[0040] The intermittent deflection mechanism 3 includes a main rotating shaft 31 rotatably connected to the packaging box 2 via bearings. One end of the main rotating shaft 31 located in the packaging cavity 21 is fixedly connected to the material separator 213. A sector-shaped frame 311 is fixedly installed at one end of the main rotating shaft 31 extending into the packaging box 2. The sector-shaped frame 311 has an arc-shaped groove for limiting the sliding of the arc-shaped toothed ring 312. Limiting blocks 3111 for limiting the sliding of the arc-shaped toothed ring 312 are also fixedly installed at both ends of the arc-shaped groove on the sector-shaped frame 311. A connecting rod 313 is also movably connected to the sector-shaped frame 311. The other end of the connecting rod 313 is hinged to a power arm 314 driven by a servo motor 315. The servo motor 315 is embedded in the packaging box 2, and the output shaft of the servo motor 315 is connected to the end of the power arm 314 away from the connecting rod 313. The servo motor 315 is a brushless motor with good waterproof performance. Its rotation angle and speed can be precisely controlled by the control body 7 and the power transmission through the connecting rod 313 realizes the intermittent deflection of the material separator 213. The arc-shaped toothed ring 312 can slide on the arc-shaped groove of the sector frame 311. The limit block 3111 is made of rubber, which can buffer the impact force of the arc-shaped toothed ring 312 and avoid component wear. At the same time, it limits the maximum deflection angle of the material separator 213 and prevents the material separator 213 from deflecting excessively and hitting the inner wall of the dispensing cavity 21. The hinge joints of the connecting rod 313 with the sector frame 311 and the power arm 314 are equipped with self-lubricating bearings to reduce transmission resistance and improve the service life of the mechanism. The bearing connection between the main rotating shaft 31 and the dispensing box 2 is equipped with a sealing sleeve to prevent dust or liquid from entering and ensure rotational stability.

[0041] The intermittent deflection mechanism 3 also includes a stirring rack 32 installed on the dispensing box 2. The stirring rack 32 extends to one end outside the dispensing box 2 and is fixedly installed with a driven gear 321. The driven gear 321 meshes with the arc-shaped toothed ring 312. The end of the stirring rack 32 located in the transition cavity 22 is provided with a driven stirring rod 322, and the driven stirring rod 322 is rotatably connected to the transition cavity 22 through the driven gear 321. The driven gear 321 can be driven by meshing with the arc-shaped toothed ring 312 to ensure that the driven stirring rod 322 rotates synchronously when the material separator 213 deflects, so as to realize the stirring of the sample or waste liquid in the transition cavity 22 and avoid sample clumping or washing liquid sedimentation. The driven stirring rod 322 adopts a spiral structure and has an elastic scraper made of food-grade silicone on its surface. The scraper is in contact with the inner wall of the transition cavity 22. The stirring rack 32 is made of stainless steel to ensure structural strength and corrosion resistance.

[0042] The extraction mechanism 4 includes an extraction hopper 41 corresponding to the dispensing channel 211. The extraction hopper 41 is connected to the dispensing channel 211 via a telescopic joint 411. The extraction hopper 41 is equipped with a settling tube 412 and a clarifying tube 413, with the aperture of the settling tube 412 being larger than that of the clarifying tube 413. An electronic weighing unit 42 for weighing is also provided outside the extraction hopper 41. The electronic weighing unit 42 is electrically connected to the control body 7 via a wire and is mounted below the dispensing box 2 via a buffer pressure push rod frame. The telescopic joint 411 is made of food-grade corrugated pipe material, allowing for fine-tuning of the extraction hopper 41's height. This ensures a sealed connection between the extraction hopper 41 and the dispensing channel 211 when the weight of the extraction hopper 41 increases, preventing damage during the extraction process. In case of leakage or evaporation of the extract, the settling tube 412 has a larger aperture and is used for the sedimentation and separation of coarse particulate impurities or for separation when the bottom layer of the extract is used as the test liquid. The outlet of the clarifying tube 413 is equipped with a filter screen to ensure that the discharged test liquid is free of suspended impurities. Both tubes are equipped with valves electrically connected to the control body 7, which can automatically switch on and off according to the settling time. The electronic weighing unit 42 can monitor the total mass of the sample and extract in the extraction hopper 41 in real time and feed the data back to the control body 7. Combined with the preset liquid-solid ratio, the amount of extract added is automatically adjusted. The buffer pressure push rod frame has built-in shock-absorbing springs and hydraulic dampers to counteract the vibration caused by vehicle bumps, ensure weighing stability, and solve the weighing error problem of existing manual balances in bumpy environments.

[0043] The extraction mechanism 4 also includes an extraction liquid storage tank 43 and a water tank 44 fixedly installed on the dispensing box 2. The extraction liquid storage tank 43 is equipped with a liquid inlet pipe 431 connected to the extraction hopper 41, and the water tank 44 is equipped with a water inlet pipe 441 connected to the extraction hopper 41. Both the liquid inlet pipe 431 and the water inlet pipe 441 are equipped with electromagnetic flow valves controlled by the control body 7. Both the extraction liquid storage tank 43 and the water tank 44 are made of transparent food-grade PET material and are filled with different extraction media and purified water, respectively. The quantitative ratio of the two allows for simultaneous testing of the same sample using different methods. The tank is equipped with a liquid level scale and a liquid level sensor, which automatically alarms and prompts for replenishment when the liquid level is low. The inlets of the liquid addition pipe 431 and the water addition pipe 441 are equipped with anti-drip connectors. The electromagnetic flow valves of both pipes can be controlled by the control unit 7 to precisely regulate the amount of extractant and water added based on the feedback data from the electronic weighing unit 42, thereby achieving automatic control of the liquid-solid ratio. The outlets of the liquid addition pipe 431 and the water addition pipe 441 both extend into the interior of the extraction hopper 41.

[0044] The solid-liquid separation mechanism 5 includes a separation bucket 51 fixedly mounted on the extraction bucket 41. The separation bucket 51 has a filtrate chamber 511 for collecting the test liquid. The separation bucket 51 also has a test liquid outlet 5111 connected to the filtrate chamber 511. A sludge collection tank 52, corresponding to the settling pipe 412, is detachably mounted on the separation bucket 51. The sludge collection tank 52 has a filter groove 521 for filtering out the test liquid. The separation bucket 51 and the extraction bucket 41 are connected by a flange. The inner wall of the filtrate chamber 511 is coated with a polytetrafluoroethylene anti-stick coating to prevent the test liquid from adhering and remaining. The bottom of the filtrate chamber 511... The inclined design guides the test liquid to flow towards the test liquid outlet 5111, which is equipped with a standard threaded interface. It can be directly connected to the sample inlet tube of the detection instrument (such as a chromatograph or mass spectrometer) to achieve rapid transfer of the test liquid and reduce manual transfer steps. Alternatively, it can be used to place test tubes to achieve automatic collection of the test liquid, realizing fully automated operation of "sample in, test liquid out". The slag collection tank 52 is detachably connected to the separation hopper 51 by threads, which facilitates the cleaning and recycling of waste residue entering through the settling pipe 412. The filter tank 521 separates the liquid and solid in the test liquid.

[0045] The disinfection and cleaning mechanism 6 consists of a ventilation temperature control component 61 for temperature control and a steam disinfection component 62 for steam disinfection. The ventilation temperature control component 61 includes an airflow channel 611 fixedly installed on the pulverizing tank 1. An electric heating temperature control ring 6111 connected to the control body 7 is provided on the airflow channel 611. A purification filter element 612 is fixedly installed at one end of the airflow channel 611 extending outside the pulverizing tank 1. An air pump 613 is provided at one end of the airflow channel 611 near the pulverizing tank 1. The air pump 613 on the ventilation temperature control component 61 draws external air into the airflow channel 611 after purification by the purification filter element 612. The air is then heated by the electric heating temperature control ring 6111. The heating temperature range can be adjusted by the control body 7 to form clean hot air that is introduced into the pulverizing tank 1, the dispensing chamber 21, the transition chamber 22, etc., to achieve drying and preheating of the equipment, prevent the samples from getting damp or sticking, and dry the residual moisture inside the equipment after cleaning. All tanks or pipelines involving gas in the device are equipped with corresponding pressure gauges and safety relief valves.

[0046] The steam sterilization assembly 62 includes a steam tank 621 fixedly installed on the grinding tank 1. The steam tank 621 is equipped with a steam pipe 622. One end of the steam pipe 622 is located in the dispensing channel 211 and is connected to the transition chamber 22. A booster pump 623 is installed at the end of the steam pipe 622 that extends into the grinding tank 1. Clean water is injected into the steam tank 621 of the steam sterilization assembly 62 through the water inlet. The water is heated by the built-in heating pipe to generate high-pressure steam. After being pressurized by the booster pump 623, the steam is delivered to key parts such as the grinding tank 1, the transition chamber 22, the dispensing channel 211, and the extraction hopper 41 through the steam pipe 622. The high-temperature and high-pressure steam achieves all-round sterilization in a short time, solving the problem of cross-contamination of samples. After sterilization, the device is completely dried by the air temperature control assembly 61.

[0047] During the mobile testing of food samples, the device first activates the air temperature control component 61 via the main control unit 7 to preheat and dry parts such as the crushing tank 1 and the dispensing chamber 21; at the same time, the steam sterilization component 62 completes the first sterilization of the equipment, and after sterilization, the air temperature control component 61 blows away the residual condensate.

[0048] The food sample is placed into the sealed lid of the sample hopper 13. After the sealed lid is closed, the speed of the crushing roller 12, the dispensing ratio, and the liquid-solid ratio are set by the control body 7. The crushing roller 12 is started to rotate in reverse, and the solenoid valve of the discharge hopper 11 is opened to control the sample falling speed. After crushing, the sample enters the dispensing chamber 21 through the discharge hopper 11 and the collection hopper 222. The servo motor 315 is started, and the main rotating shaft 31 and the material separator 213 are driven to deflect intermittently through the power arm 314 and the connecting rod 313. At the same time, the arc-shaped toothed ring 312 meshes with the driven gear 321, driving the driven stirring rod 322 to stir synchronously in the transition chamber 22. The sample is directed to the dispensing channel 211 through the conical guide seat 212, the material separator 213, and the guide plate 2131, and finally enters the extraction hopper 41, realizing the automatic dispensing of the crushed sample.

[0049] The electronic weighing unit 42 monitors the sample mass in the extraction hopper 41 in real time and feeds it back to the control unit 7. The control unit 7 regulates the electromagnetic flow valves of the liquid addition pipe 431 and the water addition pipe 441 to accurately add the extraction liquid and water according to the preset liquid-solid ratio. The telescopic joint 411 adaptively adjusts to ensure sealing. The buffer pressure push rod frame on the electronic weighing unit 42 has built-in shock-absorbing springs and hydraulic dampers to counteract the vibration caused by vehicle bumps and further ensure weighing stability.

[0050] After extraction, the sample is allowed to settle. The control unit 7 opens the settling pipe valve 412 or the clarifying pipe valve 413 according to the position of the sample containing the test liquid in the extract. If the bottom product of the extract is required, coarse particles and impurities will enter the slag collection tank 52 with some liquid. The filter tank 521 filters out solid particles. If the upper product of the extract is required, the clarifying pipe valve 413 is opened. The clarified test liquid after filtration flows into the filtrate chamber 511 of the separation hopper 51. The test liquid in the filtrate chamber 511 is guided to the test liquid outlet 5111 by the inclined bottom surface. It is connected to the detection instrument or test tube through the standard interface to complete the automatic collection. The process of "sample in, test liquid out" is fully automated, reducing manual transfer steps.

[0051] After sample preparation, the water tank 44 injects clean water into each component through the water inlet pipe 441 for rinsing. The steam tank 621 is filled with clean water and heated to 121°C through the built-in heating tube to generate high-pressure steam. After being pressurized by the booster pump 623, the steam is delivered to key parts such as the pulverizing tank 1, the transition chamber 22, the dispensing channel 211, and the extraction hopper 41 through the steam pipe 622. The high-temperature and high-pressure steam achieves all-round disinfection in a short time. The air pump 613 draws external air into the airflow channel 611 after it is purified by the purification filter element 612. The air is heated by the electric heating temperature control ring 6111 to form clean hot air that is introduced into the pulverizing tank 1, the dispensing chamber 21, the transition chamber 22, and other parts to achieve drying and preheating of the equipment, preventing the sample from getting damp or sticking. At the same time, it can also dry the residual moisture inside the equipment after cleaning, achieving automatic cleaning of the device after use.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mobile sample preparation device for food inspection and testing, characterized in that: It includes a pulverizing tank (1) and a dispensing box (2). The dispensing box (2) is provided with an extraction mechanism (4) and a solid-liquid separation mechanism (5) for extraction and solid-liquid separation at one end away from the pulverizing tank (1). The pulverizing tank (1) is also provided with a disinfection and cleaning mechanism (6) for disinfection and cleaning. The dispensing box (2) is equipped with a control body (7) for monitoring and control. The bottom of the crushing tank (1) is provided with a discharge hopper (11) that communicates with the dispensing box (2). The crushing tank (1) is also equipped with a crushing roller (12) for crushing samples. The top of the crushing tank (1) is also equipped with a sample hopper (13) for putting in food samples. The dispensing box (2) has a funnel-shaped dispensing cavity (21) and a dispensing channel (211) connected to the dispensing cavity (21) is symmetrically provided on the dispensing box (2). A conical guide seat (212) is fixedly installed at the bottom of the dispensing cavity (21) and between the dispensing channels (211). A material separator seat (213) adapted to the dispensing cavity (21) is movably connected in the dispensing cavity (21) and the material separator seat (213) is rotatably connected in the dispensing cavity (21) through an intermittent deflection mechanism (3). The material separator (213) has inclined dispensing slopes, and symmetrically distributed guide plates (2131) are fixedly installed on the material separator (213) along its dispensing slopes. The material separator (213) and the conical guide plate (212) are arranged to avoid each other.

2. The mobile sample preparation equipment for food inspection and testing according to claim 1, characterized in that, The dispensing cavity (21) is also provided with a transition cavity (22) opposite to the dispensing cavity (21). The dispensing cavity (21) is provided with a cleaning channel (221) connected to the transition cavity (22). The transition cavity (22) is fixedly installed with a material hopper (222) corresponding to the discharge hopper (11) at one end near the crushing tank (1).

3. The mobile sample preparation equipment for food inspection and testing according to claim 1, characterized in that, The intermittent deflection mechanism (3) includes a main shaft (31) rotatably connected to the packaging box (2) via a bearing. One end of the main shaft (31) located in the packaging cavity (21) is fixedly connected to the material separator (213). A sector frame (311) is fixedly installed at one end of the main shaft (31) extending into the packaging box (2). An arc-shaped groove for limiting the sliding of the arc-shaped toothed ring (312) is provided on the sector frame (311). Limiting blocks (3111) for limiting the sliding of the arc-shaped toothed ring (312) are also fixedly installed at both ends of the arc-shaped groove on the sector frame (311). A connecting rod (313) is movably connected to the fan-shaped frame (311). The other end of the connecting rod (313) is hinged to a power arm (314) driven by a servo motor (315). The servo motor (315) is embedded in the packaging box (2), and the output shaft of the servo motor (315) is connected to the end of the power arm (314) away from the connecting rod (313).

4. The mobile sample preparation equipment for food inspection and testing according to claim 3, characterized in that, The intermittent deflection mechanism (3) also includes a stirring rack (32) installed on the packaging box (2). The stirring rack (32) extends to one end outside the packaging box (2) and is fixedly installed with a driven gear (321). The driven gear (321) meshes with the arc-shaped gear ring (312). The end of the stirring rack (32) located in the transition cavity (22) is provided with a driven stirring rod (322), and the driven stirring rod (322) is rotatably connected to the transition cavity (22) through the driven gear (321).

5. The mobile sample preparation equipment for food inspection and testing according to claim 1, characterized in that, The extraction mechanism (4) includes an extraction hopper (41) corresponding to the dispensing channel (211). The extraction hopper (41) is connected to the dispensing channel (211) through a telescopic joint (411). The extraction hopper (41) is provided with a settling tube (412) and a clarifying tube (413). The aperture of the settling tube (412) is larger than the aperture of the clarifying tube (413). An electronic weighing unit (42) for weighing is provided outside the extraction hopper (41). The electronic weighing unit (42) is electrically connected to the control body (7) via a wire, and the electronic weighing unit (42) is installed below the dispensing box (2) via a buffer pressure push rod frame.

6. The mobile sample preparation equipment for food inspection and testing according to claim 5, characterized in that, The extraction mechanism (4) also includes an extraction liquid storage tank (43) and a water tank (44) fixedly installed on the dispensing box (2). The extraction liquid storage tank (43) is equipped with a liquid addition pipe (431) connected to the extraction bucket (41), and the water tank (44) is equipped with a water addition pipe (441) connected to the extraction bucket (41). Both the liquid addition pipe (431) and the water addition pipe (441) are equipped with electromagnetic flow valves controlled by the control body (7).

7. The mobile sample preparation equipment for food inspection and testing according to claim 1, characterized in that, The solid-liquid separation mechanism (5) includes a separation bucket (51) fixedly installed on the extraction bucket (41). The separation bucket (51) has a filtrate chamber (511) for collecting the test liquid. The separation bucket (51) also has a test liquid outlet (5111) connected to the filtrate chamber (511). The separation bucket (51) is also detachably installed with a slag collection tank (52) corresponding to the settling tube (412). The slag collection tank (52) has a filter tank (521) for filtering out the test liquid.

8. The mobile sample preparation equipment for food inspection and testing according to claim 1, characterized in that, The disinfection and cleaning mechanism (6) is composed of a ventilation temperature control component (61) for temperature control and a steam disinfection component (62) for steam disinfection. The ventilation temperature control component (61) includes an airflow channel (611) fixedly installed on the pulverizing tank (1). An electric heating temperature control ring (6111) connected to the control body (7) by an electrical signal is provided on the airflow channel (611). A purification filter element (612) is fixedly installed at one end of the airflow channel (611) extending outside the pulverizing tank (1). A vacuum pump (613) is provided at one end of the airflow channel (611) near the pulverizing tank (1).

9. The mobile sample preparation equipment for food inspection and testing according to claim 8, characterized in that, The steam sterilization assembly (62) includes a steam tank (621) fixedly installed on the grinding tank (1). The steam tank (621) is provided with a steam pipe (622). One end of the steam pipe (622) located in the dispensing channel (211) is connected to the transition chamber (22). A booster pump (623) is installed at one end of the steam pipe (622) extending into the grinding tank (1).

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