Sample pretreatment device for food detection

Abstract

The invention relates to the technical field of food detection, in particular to a sample pretreatment device for food detection, which comprises a mixing cylinder, an inner center pipe is fixedly mounted at the inner end of the mixing cylinder, a center rod penetrates through the inner end of the inner center pipe, a plurality of positioning frames are fixedly mounted at the inner end of the inner center pipe, and a plurality of supporting pipes penetrate through the inner ends of the positioning frames. According to the invention, a plurality of test tubes are uniformly mounted on the tube rack and are limited and positioned through the fixing rings, and then the tube rack is integrally arranged on the outer surface of the central rod in a sleeving manner, so that uniform mounting and rapid arrangement of the plurality of test tubes are realized; all test tubes can be placed on the outer side of the center rod at a time, arrangement and replacement of sample containers are rapidly achieved, the operation efficiency and maintenance convenience of the device are improved, then manual operation errors are avoided, the automation level of the system is improved, and the time sequence consistency of sample collection and the stability of system operation are effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of food testing, in particular to a sample preprocessing device for food testing. Background Art

[0002] As people's living standards continue to improve, food safety issues are increasingly receiving widespread attention from all walks of life. To ensure food quality and consumer health, food usually needs to undergo a rigorous testing and analysis process before it is put on the market to identify possible harmful substances or illegal additives. Sample pretreatment is an important link in food testing, and its processing quality directly affects the accuracy and reliability of subsequent test results.

[0003] After searching, it was found that the prior art publication number is CN117309530A, which discloses a sample pretreatment device for food testing, including: a conveyor belt, which is arranged in a sterile room; a centrifuge, which is arranged above the conveyor belt, and a top cover is provided above the centrifuge, and the centrifuge tube of the centrifuge is arranged at the bottom of the centrifuge; a grinder, which is arranged above the top cover and is connected to the centrifuge; a water tank, which is arranged above the top cover and is connected to the grinder; a culture dish, which is arranged on the conveyor belt, and the culture dish has a static state and a moving state. The culture dish in the static state corresponds to the centrifuge tube, and the culture dish in the moving state moves with the transmission belt. This solution automates the entire process from sample crushing to culture, and the entire process is carried out in a sterile room, without the need for human contact, thereby avoiding sample infection.

[0004] Therefore, based on the above search and combined with existing technologies, the existing sample extraction structures are mostly single-layer sampling designs, which can only collect samples from the surface of the mixing container or a single depth, and cannot achieve independent or combined collection of samples at different depths, affecting the representativeness of the samples and the accuracy of detection. In addition, the traditional sampling method requires collection or replacement one by one through a single test tube, which has problems such as cumbersome operation, frequent manual intervention, and easy introduction of errors. The test tube arrangement is inefficient and it is difficult to meet the needs of multi-point rapid sampling. For this reason, the present application proposes a sample pretreatment device for food testing. Summary of the Invention

[0005] The object of the present invention is to provide a sample pretreatment device for food testing to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sample pretreatment device for food testing, comprising a mixing cylinder, an inner center tube fixedly mounted on the inner end of the mixing cylinder, a drive motor fixedly mounted on the outer surface of the inner center tube, a stirring rod fixedly connected to the output end of the drive motor, a center rod passed through the inner end of the inner center tube, and a tube rack sleeved on the outer surface of the center rod, a plurality of test tubes for extracting food samples are placed inside the tube rack, a plurality of positioning racks fixedly mounted on the inner end of the inner center tube, the positioning racks corresponding to the tube racks, a plurality of support tubes passed through the inner end of the positioning rack, a delivery device for transporting samples to the test tubes is provided inside the support tubes, a bottom cover is detachably mounted on the inner bottom end of the inner center tube, and the center rod is detachably connected to the bottom cover.

[0007] As a further solution of the present invention, a sealing cover is provided above the bottom cover, and a ring tube is fixedly connected to the end of the sealing cover close to the bottom cover, and a plurality of locking blocks are passed through the outer surface of the ring tube, and the locking blocks are arranged in a ring shape. An unlocking ring is fixedly installed on the upper end of the bottom cover, and the unlocking ring is passed through the interior of the locking block. By providing a ring tube at the end of the sealing cover close to the bottom cover and arranging a plurality of locking blocks in a ring shape on the outer surface of the ring tube, and cooperating with the unlocking ring provided at the upper end of the bottom cover, the sealing cover and the bottom cover can be quickly locked and unlocked, thereby improving the sealing performance and ease of use of the device.

[0008] As a further solution of the present invention, a plurality of tube sleeves are provided at the inner end of the tube rack, the test tubes are provided inside the tube sleeves, a plurality of matching rings are provided at the inner end of the tube sleeves, the test tubes are provided inside the matching rings, the matching rings and the tube sleeves are connected by a counterweight spring, the test tubes are provided in turn inside the tube sleeves and the matching rings, and the matching rings and the tube sleeves are connected by a counterweight spring, so that the test tubes have buffering and positioning functions during the sampling process, effectively improving the stability and sealing of the test tubes, and avoiding displacement or loosening of the test tubes due to vibration or assembly errors, thereby ensuring the accuracy and reliability of sample collection.

[0009] As a further solution of the present invention, the delivery device includes a reset plate, which is rotatably mounted on the inner end of the support tube. A rectangular hole is provided on the outer surface of the tube sleeve. An output tube is fixedly mounted on the inner end of the reset plate, and the reset plate is passed through the interior of the tube sleeve through the rectangular hole. At this time, the output port of the output tube faces the inlet of the test tube.

[0010] As a further solution of the present invention, a suction tube is fixedly installed on the inner end of the support tube, and the suction tube and the output tube are connected by a transmission tube. The inner end of the suction tube is provided with a sealing bag, and the input port of the transmission tube corresponds to the sealing bag. The end of the suction tube away from the sealing bag is fixedly connected to a pressure pump. When the pressure pump extracts the air inside the suction tube, the sealing bag moves toward the pressure pump.

[0011] As a further solution of the present invention, two extension surface shells are fixedly installed on the outer surface of the support tube, the inner ends of the extension surface shells are each penetrated by a support surface shell, the inner ends of the support surface shells are penetrated by a spring sheet, the inner ends of the support surface shells are sleeved with a movable plug, and the movable plug is fixedly connected to the spring sheet. After the spring sheet moves under downward pressure, it pushes the movable plug to move toward the direction of the extension surface shell.

[0012] As a further solution of the present invention, a support tube is fixedly installed on the inner end of the support surface shell, a movable cover is provided at the inner end of the support tube, and an isolation plate is sleeved on the outer surface of the support tube, a cavity is formed between the isolation plate and the movable plug, and a deflation rod is fixedly connected to one end of the movable plug close to the support tube, and the deflation rod is passed through the inside of the movable cover.

[0013] As a further solution of the present invention, a sealing ring is fixedly installed on the inner end of the support tube, and the sealing ring is sleeved on the outer surface of the movable cover. The outer surface of the movable cover is provided with a plurality of water outlet holes, and the water outlet holes are wrapped by the sealing ring. The inner end of the movable cover is provided with an expansion ring, and the expansion ring is used to fill the gap between the movable cover and the air release rod.

[0014] As a further solution of the present invention, a support rod is fixedly installed on the inner end of the support tube, and a passive bag is fixedly installed on the inner end of the support tube, and the passive bag is fixed to the outer surface of the support rod. When the pressure inside the support tube increases, the passive bag shrinks in volume under the action of pressure. The passive bag shrinks in volume when the pressure inside the support tube increases, thereby achieving response and adjustment to changes in pressure inside the tube, improving the system's adaptability and stability to pressure fluctuations, and helping to ensure the continuity and sealing of the sampling process.

[0015] As a further solution of the present invention, two locking rods are rotatably installed on the outer surface of the support tube, and the end of the locking rod away from the support tube is clamped with the inner wall of the extension surface shell to prevent the support surface shell from moving under a non-stressed state. The inner end of the extension surface shell is provided with a push plug, and the push plug is fixedly connected to the support surface shell. The push plug and the extension surface shell are connected by a pulling spring, and the elastic force of the pulling spring causes the push plug to always be subjected to a force in the direction away from the shrapnel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uniformly installs multiple test tubes on a tube rack and limits their positioning through a fixing ring. The tube rack is then integrally sleeved on the outer surface of a central rod, thereby achieving uniform installation and rapid arrangement of multiple test tubes. All test tubes can be placed on the outer side of the central rod at one time, allowing for rapid arrangement and replacement of sample containers. This improves the operating efficiency and maintenance convenience of the device, thereby avoiding human operating errors, enhancing the system's automation level, and effectively ensuring the temporal consistency of sample collection and the stability of system operation. 2. The support tube of the present invention adopts a multi-layer structure design and has multiple sampling channels. It can extract samples at different depths in the mixing cylinder separately or in combination during the food sample extraction process, solving the problem that traditional sampling devices can only extract surface or homogeneous samples, significantly improving the representativeness of the samples and the accuracy of the test results. At the same time, it can also perform delayed sampling according to the set time control mechanism, which is suitable for dynamic detection scenarios where food samples are collected in different time periods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a sample pretreatment device for food testing; Figure 2 Schematic diagram of the structure inside the mixing cylinder; Figure 3 Schematic diagram of the structure inside the inner central tube; Figure 4 This is the disassembly diagram of the bottom cover; Figure 5 It is a structural diagram of the pipe rack; Figure 6 Schematic diagram of the structure inside the pipe sleeve; Figure 7 Schematic diagram of the structure inside the support tube; Figure 8 Schematic diagram of the internal structure of the output tube; Figure 9 Schematic diagram of the structure inside the suction pipe; Figure 10 Schematic diagram of the structure inside the extended shell; Figure 11 Schematic diagram of the structure inside the support tube; Figure 12 It is a schematic diagram of the structure inside the movable cover; Figure 13 It is a structural diagram of the support rod and the movable sleeve.

[0018] In the figure: 1. Mixing cylinder; 2. Feeding cover; 3. Feeding pipe; 4. Feeding pipe; 101. Inner center tube; 102. Drive motor; 103. Stirring rod; 104. Center rod; 105. Positioning frame; 106. Bottom cover; 107. Sealing cover; 108. Tube rack; 109. Ring tube; 110. Locking block; 111. Unlocking ring; 201, support tube; 202, reset plate; 203, output tube; 204, suction tube; 205, transmission tube; 206, pressure pump; 207, air tube; 208, extension shell; 209, support shell; 210, matching tube; 211, auxiliary spring; 212, sealing capsule; 301, pipe sleeve; 302, fixing ring; 303, test tube; 304, matching ring; 305, counterweight spring; 401. Shrapnel; 402. Movable plug; 403. Support tube; 404. Locking rod; 405. Push plug; 406. Pull spring; 407. Return spring; 408. Deflation rod; 409. Movable cover; 410. Passive bag; 411. Support rod; 412. Locking spring; 413. Stabilizing rod; 414. Movable sleeve; 415. Push rod; 416. Support rod; 417. Limiting frame; 418. Support plate; 419. Expansion ring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1 - Figure 3 、 Figure 6 A sample pretreatment device for food testing includes a mixing drum 1, an inner central tube 101 is fixedly mounted on the inner end of the mixing drum 1, a driving motor 102 is fixedly mounted on the outer surface of the inner central tube 101 by bolts, an output end of the driving motor 102 is fixedly connected to a stirring rod 103, the stirring rod 103 crushes and stirs the food sample and the pharmaceutical mixture in the mixing drum 1, and a loading cover 2 is detachably mounted on the upper end of the mixing drum 1, the loading cover 2 can seal the inner central tube 101 to prevent the food sample from splashing into the inner central tube 101; A feeding pipe 3 is fixedly installed on the outer surface of the mixing barrel 1 for inputting food samples and dissolving agents. A discharging pipe 4 is fixedly installed at the bottom end of the mixing barrel 1 for discharging the food samples after testing. A central rod 104 is passed through the inner end of the inner central tube 101, and a tube rack 108 is sleeved on the outer surface of the central rod 104. A plurality of test tubes 303 for extracting food samples are placed inside the tube rack 108. A plurality of positioning racks 105 are fixedly installed on the inner end of the inner central tube 101. The positioning racks 105 correspond to the tube racks 108. A plurality of supporting tubes 201 are passed through the inner end of the positioning racks 105. A delivery device for conveying samples to the test tubes 303 is provided inside the supporting tubes 201. A bottom cover 106 is detachably installed on the inner bottom end of the inner central tube 101, and the central rod 104 is detachably connected to the bottom cover 106.

[0021] like Figure 3 、 Figure 4As shown, a sealing cover 107 is provided above the bottom cover 106, and a ring tube 109 is fixedly welded to one end of the sealing cover 107 close to the bottom cover 106. A plurality of locking blocks 110 are pierced through the outer surface of the ring tube 109. The locking blocks 110 are arranged in a ring shape. An unlocking ring 111 is fixedly welded to the upper end of the bottom cover 106. The unlocking ring 111 is passed through the interior of the locking block 110. Specifically, a plurality of triangular blocks are fixedly installed on the outer surface of the unlocking ring 111. The triangular blocks are passed through the interior of the locking block 110. When the unlocking ring 111 rotates, the lock is pushed through the inclined surface of the triangular blocks. The fixed blocks 110 move in the direction away from each other, and a plurality of rectangular holes are provided on the upper and lower sides of the outer surface of the center rod 104, which correspond to the locking blocks 110. In the default state, the locking blocks 110 are inserted into the rectangular holes of the center rod 104. At this time, the center rod 104 is stably supported. It is worth noting that a device for fixing the center rod 104, which is the same as the bottom cover 106, is provided at the bottom end of the loading cover 2. When the loading cover 2 is opened, the center rod 104 is fixed by the bottom cover 106. When the bottom cover 106 is opened, the center rod 104 is fixed by the loading cover 2. A sealing rubber ring is sleeved on the outer surface of the sealing cover 107 , and the sealing rubber ring contacts the inner wall of the inner central tube 101 .

[0022] Example 2: Please refer to Figure 5 - Figure 8 A sample pretreatment device for food testing, based on Example 1, has a plurality of tube sleeves 301 inserted into the inner end of the tube rack 108. The tube sleeves 301 are arranged in a ring shape. Test tubes 303 are inserted into the inner end of the tube sleeves 301. The inner end of the tube sleeves 301 is provided with a plurality of matching rings 304. The matching rings 304 are arranged up and down along the inner wall of the tube sleeves 301. A fastening ring is provided inside the matching rings 304. When the test tubes 303 are inserted into the matching rings 304, the fastening rings fix the test tubes 303 to prevent the test tubes 303 from being stuck. 3 shakes, the test tube 303 is inserted into the interior of the matching ring 304, and the matching ring 304 is connected to the tube sleeve 301 through the counterweight spring 305. Specifically, the upper end of the tube sleeve 301 is detachably mounted with a fixing ring 302, which is used to limit and prevent the test tube 303 from escaping from the tube sleeve 301. When the test tube 303 below the tube sleeve 301 is filled with a sample, the test tube 303 moves downward, driving the matching ring 304 to fall, and compressing the counterweight spring 305 under the action of gravity.

[0023] like Figure 5 、 Figure 7 - Figure 9As shown, the delivery device includes a reset plate 202, which is rotatably mounted on the inner end of the support tube 201. Specifically, a rectangular hole is opened on the outer surface of the tube sleeve 301, and the inner end of the reset plate 202 is fixedly mounted with the output tube 203 through a clamp, and the reset plate 202 is passed through the interior of the tube sleeve 301 through the rectangular hole. At this time, the output port of the output tube 203 faces the inlet of the test tube 303. More specifically, the reset plate 202 is clamped with the support tube 201 through a torsion spring. When the matching ring 304 moves downward, the upper test tube 303 presses the reset plate 202 to rotate it. When the test tube 303 moves down to be flush with the rectangular hole on the outer surface of the tube sleeve 301, the reset plate 202 is reset to the initial position under the action of the torsion spring. At this time, the discharge port of the output tube 203 is aligned with the feed port of the moved test tube 303. It is worth noting that the weight of the test tube 303 filled with sample is sufficient to compress the counterweight spring 305. The output end of the output tube 203 is sleeved with a matching tube 210 , and the matching tube 210 and the output tube 203 are connected via an auxiliary spring 211 .

[0024] The inner end of the support tube 201 is fixedly installed with a suction tube 204, and the suction tube 204 is connected to the output tube 203 through a transmission tube 205. The inner end of the suction tube 204 is sleeved with a sealing bag 212. The sealing bag 212 is filled with air so that its outer surface is tightly fitted with the inner wall of the suction tube 204. When the sealing bag 212 moves in the suction tube 204, the sample residue in the suction tube 204 can be completely pushed out, and the input port of the transmission tube 205 corresponds to the sealing bag 212. The end of the suction tube 204 away from the sealing bag 212 is fixedly connected to the pressure pump 206 by bolts. When the pressure pump 206 extracts the air inside the suction tube 204, the sealing bag 212 moves toward the direction of the pressure pump 206. At this time, the input port of the transmission tube 205 is exposed. At this time, the sample solution inside the mixing cylinder 1 flows into the interior of the test tube 303 along the transmission tube 205 under the action of pressure; Among them, the support tube 201 is designed with a multi-layer structure, which can perform layered extraction of samples at different depths in the mixing barrel 1 during the process of extracting food samples, and realize independent or combined extraction of samples at different depths in the mixing barrel 1, thereby improving the representativeness of the samples and the accuracy of the test results.

[0025] Example 3: Please refer to Figure 10 - Figure 13, a sample pretreatment device for food testing, based on embodiments 1 and 2, two extension surface shells 208 are fixedly installed on the outer surface of the support tube 201, and the inner ends of the extension surface shells 208 are penetrated by support surface shells 209, and the inner ends of the support surface shells 209 are penetrated by springs 401, which are made of elastic metal material, one end of which contacts the bottom end of the reset plate 202. The springs 401 can be deformed under force and can restore to their initial state under the action of their own elastic force. A guide block is welded on the inner end of the support surface shell 209 to keep the springs 401 in a 90° bent state. A movable plug 402 is sleeved on the inner end of the support surface shell 209, and the movable plug 402 is fixedly connected to the spring 401. After the spring 401 is moved by downward pressure, it pushes the movable plug 402 to move toward the direction of the extension surface shell 208. The movable plug 402 is connected to the support tube 403 by a reset spring 407; A support cylinder 403 is fixedly mounted on the inner end of the support surface shell 209. A movable cover 409 is provided on the inner end of the support cylinder 403. An isolation plate is sleeved on the outer surface of the support cylinder 403. A cavity is formed between the isolation plate and the movable plug 402. The movable cover 409 and the support cylinder 403 are connected by a spring, so that the movable cover 409 is always kept away from the force of the movable plug 402. A deflation rod 408 is fixedly welded to the end of the movable plug 402 close to the support cylinder 403, and the deflation rod 408 is passed through the interior of the movable cover 409. Specifically, a sealing ring is fixedly installed on the inner end of the support tube 403, and the sealing ring is sleeved on the outer surface of the movable cover 409. The outer surface of the movable cover 409 is provided with a plurality of water outlet holes, and the water outlet holes are wrapped by the sealing ring. An expansion ring 419 is provided on the inner end of the movable cover 409. The expansion ring 419 is used to fill the gap between the movable cover 409 and the deflation rod 408. The expansion ring 419 is made of silicone and has elasticity. More specifically, a limit frame 417 is fixedly installed on the inner end of the movable cover 409, and the outer surface of the air release rod 408 is a corrugated surface. A plurality of support plates 418 are rotatably installed on the outer surface of the limit frame 417. The support plates 418 are arranged in a ring shape and are fixedly connected to the outer surface of the expansion ring 419, and the ends of the support plates 418 close to each other are fixedly installed with protrusions, which are located at the troughs of the outer surface of the air release rod 408. When the air release rod 408 moves toward the limit frame 417, the support plate 418 will continue to jump under the action of the corrugated surface of the air release rod 408. At this time, the support plate 418 drives the expansion ring 419 to open during the jumping process. At this time, when the movable plug 402 moves, it can squeeze the air into the inside of the support tube 403.

[0026] like Figure 10 、 Figure 11 、 Figure 13As shown, a support rod 411 is fixedly installed at the inner end of the support tube 403 by bolts, and a passive capsule 410 is fixedly installed at the inner end of the support tube 403. The passive capsule 410 is fixed to the outer surface of the support rod 411, and its end is connected to the inner wall of the support tube 403 to form a sealed space. When the internal pressure of the support tube 403 increases, the volume of the passive capsule 410 shrinks under the action of the pressure. Two locking rods 404 are rotatably mounted on the outer surface of the support tube 403. The ends of the locking rods 404 away from the support tube 403 are engaged with the inner wall of the extension shell 208 to prevent the support shell 209 from moving when not under stress. Specifically, two engaging grooves are formed at the inner end of the extension shell 208, and the ends of the locking rods 404 are inserted into the engaging grooves. A plurality of support rods 416 are rotatably mounted on the outer surface of the support rod 411. The plurality of support rods 416 are arranged in a ring shape, and the ends of the support rods 416 are fixedly connected to the inner wall of the passive capsule 410. A movable sleeve 414 is sleeved on the outer surface of the support rod 411, wherein the movable sleeve 414 is divided into two sections. A plurality of push rods 415 are rotatably mounted on the outer surface of the movable sleeve 414 on the side close to the passive capsule 410 through a rotating shaft, and the push rods 415 are slidably connected to the support rods 416, while the other movable sleeve 414 is connected to the support rod 411 through a locking spring 412, and two stabilizing rods 413 are rotatably mounted on the outer surface of the movable sleeve 414, and one end of the stabilizing rod 413 away from the movable sleeve 414 is rotatably connected to the locking rod 404, and the movable sleeve 414 divided into two sections does not contact each other; In the default state, the two stabilizing bars 413 are in a vertical state, and the end of the locking bar 404 is clamped in the slot at the inner end of the extension surface shell 208. When the two stabilizing bars 413 are in a non-vertical state, it means that the locking bar 404 can rotate freely, and at this time the supporting surface shell 209 can rotate freely.

[0027] like Figure 7 、 Figure 9 、 Figure 10 As shown, the inner end sleeve of the extension surface shell 208 is provided with a push plug 405, and the push plug 405 is fixedly connected to the support surface shell 209. The push plug 405 and the extension surface shell 208 are connected by a pulling spring 406. The elastic force of the pulling spring 406 causes the push plug 405 to always be subjected to a force in the direction away from the shrapnel 401. Specifically, the extension surface shell 208 and the sealing bag 212 are connected by the air pipe 207. When the sealing bag 212 is compressed, the pressure in the internal chamber of the extension surface shell 208 increases, and the push plug 405 pushes the movable cover 409 to move in the direction away from the extension surface shell 208.

[0028] More specifically, a displacement sensor is provided inside the supporting surface shell 209 for detecting the movement state of the shrapnel 401. When it is detected that the shrapnel 401 starts to move, the pressure pump 206 immediately stops suctioning and switches to a pressurized state. At this time, the sealing bag 212 shrinks in volume under the action of pressure, squeezing and discharging the internal air. It is worth noting that the operation of all electronic devices in the present invention is uniformly controlled by the control terminal, and their specific working modes can be flexibly operated through the control terminal, rather than adopting a single fixed operating logic.

[0029] The working principle of the present invention is: Before use, the test tube 303 is placed inside the tube sleeve 301 and is limited by the fixing ring 302. Then, the tube rack 108 is placed on the outer surface of the center rod 104. As the tube rack 108 falls, it quickly falls to the designated position. The first rotation of the reset plate 202 is completed as the tube rack 108 falls. After the tube rack 108 reaches the designated position, the reset plate 202, under the elastic force of the torsion spring, carries the output tube 203 through the rectangular hole on the outer surface of the tube sleeve 301 and comes to the top of the test tube 303. At this time, the matching tube 210 moves to the inside of the test tube 303 under the elastic force of the auxiliary spring 211. The moving length is sufficient to prevent the flowing sample solution from splashing outside the test tube 303. Then, the pressure pump 206 enters the pressurized state, and the pressure inside the suction tube 204 increases. At this time, the sealing bag 212 is deformed under the action of pressure, and the volume of the sealing bag 212 is reduced, and the air inside is discharged. The discharged air enters the interior of the extension surface shell 208 along the air pipe 207, and the push plug 405 drives the support surface shell 209 to move until the end of the locking rod 404 is engaged with the groove at the inner end of the extension surface shell 208. At this time, the end of the spring 401 away from the support surface shell 209 contacts the bottom end of the reset plate 202; Put the feeding cover 2 back on the upper end of the mixing drum 1, then put the food to be tested and related auxiliary testing reagents into the mixing drum 1 through the feeding pipe 3, then start the driving motor 102 and stir the food sample in the mixing drum 1 through the stirring rod 103; The pressure pump 206 is then switched to a suction state, and the sealing capsule 212 moves under the suction force of the pressure pump 206 (the sealing capsule 212 is still in a contracted state at this time). The food sample solution inside the mixing cylinder 1 enters the interior of the transmission tube 205 through the suction tube 204 under the action of pressure, and flows along the transmission tube 205 into the interior of the test tube 303. As the sample solution inside the test tube 303 increases, its gravity increases accordingly. When the gravity reaches a certain level, the test tube 303 begins to move downward. At this time, the bottom end of the test tube 303 located on the upper part of the tube sleeve 301 presses down the reset plate 202, causing it to rotate. When the reset plate 202 rotates, the transmission action of the shrapnel 401 pushes the movable plug 402 to move toward the support tube 403. The movable plug 402 compresses the reset spring 407 during the movement, and the air release rod 408 is also moving. The support plate 418 is continuously jumping under the action of the air release rod 408 on the corrugated surface. At this time, the support plate 418 drives the expansion ring 419 to open during the jumping process. At this time, the movable plug 402 can squeeze the air into the interior of the support tube 403 when it moves, and as the internal pressure of the support tube 403 increases, the passive bag 410 is compressed, and the support rod 416 inside it starts to rotate and starts to push the push rod 415 to rotate it. The push rod 415 applies a lateral force to the movable sleeve 414. At this time, the movable sleeve 414 contacts the other movable sleeve 414 after moving a distance, and prompts the other movable sleeve 414 to start moving. During the movement of the movable sleeve 414, the locking spring 412 is compressed. At this time, the stabilizing rod 413 is in a non-vertical state during the movement of the movable sleeve 414. At this time, the spring 406 is pulled to drive the push plug 405 to move under the action of the elastic force. At the same time, the sealing bag 212 returns to a saturated state. At the same time, the pressure pump 206 enters a pressurized state, causing the sealing bag 212 to start moving and re-block the transmission pipe 205. At this time, the reset plate 202 rotates completely under the action of the gravity of the test tube 303. At this time, the test tube 303 located above the tube sleeve 301 moves downward, and then the output tube 203 is re-aligned with the entrance of the test tube 303. Since the sealing bag 212 is compressed under the action of the pressure pump 206, the shrapnel 401 is in a non-stressed state and returns to its initial state. At the same time, the passive bag 410 returns to its initial state under the action of its own elastic force, and the movable sleeve 414 also returns to its initial state under the elastic force of the locking spring 412. The stabilizing rod 413 is now restored to a vertical state, and the locking rod 404 is clamped in the groove on the inner wall of the extension surface shell 208. At this time, delayed collection can be performed to collect samples of different time periods.

[0030] After the sample is collected, the bottom cover 106 is rotated, and the bottom cover 106 drives the unlocking ring 111 to rotate. The locking blocks 110 are driven by the unlocking ring 111 to move away from each other. At this time, the bottom cover 106 can be removed, and the tube holder 108 is separated from the inner center tube 101 under the action of gravity. At this point, the food sample pretreatment and sample collection are completed.

[0031] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sample pretreatment device for food testing, comprising a mixing cylinder (1), characterized in that: An inner central tube (101) is fixedly mounted on the inner end of the mixing cylinder (1), a driving motor (102) is fixedly mounted on the outer surface of the inner central tube (101), a stirring rod (103) is fixedly connected to the output end of the driving motor (102), a central rod (104) is passed through the inner end of the inner central tube (101), and a tube rack (108) is sleeved on the outer surface of the central rod (104), and a plurality of test tubes (303) for extracting food samples are placed inside the tube rack (108). A plurality of positioning frames (105) are fixedly mounted on the inner end of the inner central tube (101), and the positioning frames (105) correspond to the tube rack (108). A plurality of support tubes (201) are passed through the inner end of the positioning frame (105), and a delivery device for delivering samples to the test tube (303) is provided inside the support tube (201). A bottom cover (106) is detachably mounted on the inner bottom end of the inner central tube (101), and the central rod (104) is detachably connected to the bottom cover (106).

2. A food testing sample pretreatment device according to claim 1, characterized in that: A sealing cover (107) is provided above the bottom cover (106), and a ring tube (109) is fixedly connected to one end of the sealing cover (107) close to the bottom cover (106). A plurality of locking blocks (110) are passed through the outer surface of the ring tube (109), and the locking blocks (110) are arranged in a ring shape. An unlocking ring (111) is fixedly installed on the upper end of the bottom cover (106), and the unlocking ring (111) is passed through the interior of the locking block (110).

3. A food sample pretreatment device according to claim 2, characterized in that: The inner end of the tube rack (108) is provided with a plurality of tube sleeves (301), the test tubes (303) are provided inside the tube sleeves (301), the inner end of the tube sleeve (301) is provided with a plurality of matching rings (304), the test tubes (303) are provided inside the matching rings (304), and the matching rings (304) and the tube sleeve (301) are connected via a counterweight spring (305).

4. A food testing sample pretreatment device according to claim 3, characterized in that: The delivery device comprises a reset plate (202), the reset plate (202) being rotatably mounted on the inner end of the support tube (201), the outer surface of the tube sleeve (301) being provided with a rectangular hole, the inner end of the reset plate (202) being fixedly mounted with an output tube (203), and the reset plate (202) being passed through the interior of the tube sleeve (301) through the rectangular hole, and the output port of the output tube (203) being directed towards the inlet of the test tube (303).

5. A food testing sample pretreatment device according to claim 4, characterized in that: A suction tube (204) is fixedly installed at the inner end of the support tube (201), and the suction tube (204) is connected to the output tube (203) via a transmission tube (205). A sealing bag (212) is sleeved on the inner end of the suction tube (204), and the input port of the transmission tube (205) corresponds to the sealing bag (212). The end of the suction tube (204) away from the sealing bag (212) is fixedly connected to a pressure pump (206). When the pressure pump (206) extracts air from the suction tube (204), the sealing bag (212) moves toward the pressure pump (206).

6. A food testing sample pretreatment device according to claim 1, characterized in that: Two extension surface shells (208) are fixedly mounted on the outer surface of the support tube (201), and the inner ends of the extension surface shells (208) are each penetrated by a support surface shell (209), and the inner ends of the support surface shells (209) are penetrated by a spring piece (401), and the inner end of the support surface shell (209) is sleeved with a movable plug (402), and the movable plug (402) is fixedly connected to the spring piece (401), and when the spring piece (401) is moved by downward pressure, it pushes the movable plug (402) to move in the direction of the extension surface shell (208).

7. A food testing sample pretreatment device according to claim 6, characterized in that: A support tube (403) is fixedly mounted on the inner end of the support surface shell (209), a movable cover (409) is provided on the inner end of the support tube (403), and an isolation plate is sleeved on the outer surface of the support tube (403), a cavity is formed between the isolation plate and the movable plug (402), and an air release rod (408) is fixedly connected to one end of the movable plug (402) close to the support tube (403), and the air release rod (408) is passed through the interior of the movable cover (409).

8. A food testing sample pretreatment device according to claim 7, characterized in that: A sealing ring is fixedly mounted on the inner end of the support tube (403), and the sealing ring is sleeved on the outer surface of the movable cover (409). The outer surface of the movable cover (409) is provided with a plurality of water outlet holes, and the water outlet holes are wrapped by the sealing ring. An expansion ring (419) is provided at the inner end of the movable cover (409), and the expansion ring (419) is used to fill the gap between the movable cover (409) and the air release rod (408).

9. The food testing sample pretreatment device according to claim 8, characterized in that: A support rod (411) is fixedly mounted on the inner end of the support tube (403), and a passive bladder (410) is fixedly mounted on the inner end of the support tube (403). The passive bladder (410) is fixed to the outer surface of the support rod (411). When the internal pressure of the support tube (403) increases, the volume of the passive bladder (410) shrinks under the action of the pressure.

10. The food testing sample pretreatment device according to claim 9, characterized in that: Two locking rods (404) are rotatably mounted on the outer surface of the support tube (403), and one end of the locking rod (404) away from the support tube (403) is engaged with the inner wall of the extension surface shell (208) to prevent the support surface shell (209) from moving under a non-stressed state. The inner end of the extension surface shell (208) is provided with a push plug (405), and the push plug (405) is fixedly connected to the support surface shell (209). The push plug (405) is connected to the extension surface shell (208) through a pulling spring (406). The elastic force of the pulling spring (406) causes the push plug (405) to always be subjected to a force in a direction away from the shrapnel (401).

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