A fully automatic detector for food pesticide residue detection

Abstract

The invention discloses a fully automatic detector for detecting pesticide residues in food, and relates to the technical field of pesticide detection. The fully automatic detector comprises a base, a power mechanism, a stirring mechanism and a detector. The power mechanism is tightly connected to the base, the power mechanism is transmission-connected to the stirring mechanism, the stirring mechanism is tightly connected to the base, the stirring mechanism is communicated with the detector, the stirring mechanism is used to transport sample liquid to the detector, and the detector is used to detect pesticide residues in food. When performing detection, firstly, a crushed sample is added into the stirring mechanism, then an extracting liquid is added for stirring to promote the precipitation of pesticide components in the sample, and finally the liquid to be detected is introduced into the detector for detection.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide detection, in particular to a fully automatic detector for detecting pesticide residues in food. Background Art

[0002] The purpose of food pesticide testing is to achieve rapid, accurate and efficient detection of pesticide residues in food. It is generally used in food safety monitoring, quality control and agricultural production supervision. The operating procedure is generally to quantitatively weigh the crushed sample, then add sample extract to extract the pesticides in the sample, and send the extracted liquid into the detector for testing.

[0003] However, existing detectors often require manual processing of samples during testing, which has low work efficiency. In addition, after the samples are extracted with the extracting solution, some samples will remain in the sampling slot, which will cause interference during the next test. Summary of the invention

[0004] The purpose of the present invention is to provide a fully automatic detector for detecting pesticide residues in food to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: the fully automatic detector includes a base, a power mechanism, a stirring mechanism and a detector, the power mechanism is tightly connected to the base, the power mechanism is transmission-connected to the stirring mechanism, the stirring mechanism is tightly connected to the base, the stirring mechanism is communicated with the detector, the stirring mechanism is used to transport the sample liquid to the detector, and the detector is used to detect pesticide residues in food.

[0006] The base is used to provide stable support for the power mechanism and the stirring mechanism. The power mechanism is used to drive the stirring mechanism. When testing, the crushed sample is first added to the stirring mechanism, and then the extract is added for stirring to promote the analysis of the pesticide components in the sample. Finally, the liquid to be tested is introduced into the detector for testing. The detector can use immunoassay for testing. The detection method is roughly as follows: the extracted liquid is added to the test card of the immunochromatographic test paper, and the substance to be tested in the sample begins to react with the label antibody in the test paper. There are specific capture antibodies or antigens on the test paper, and these antibodies or antigens will specifically bind to the target substance in the sample. If the sample contains the target substance, the target substance will react with the capture antibody on the test paper and form a visible signal on the test paper. The pesticide residue can be determined by the corresponding visual detection method.

[0007] Further, a power cabin is provided on the base. The power mechanism includes a driving motor, a driving gear, and a transmission gear. The driving motor is fixedly connected to the base. The output end of the driving motor is in transmission connection with the driving gear. The driving gear is rotatably connected to the base. The driving gear and the transmission gear are located in the power cabin. The transmission gear meshes with the driving gear and is in transmission connection with the stirring mechanism.

[0008] The driving motor is the main power source of the power mechanism. When performing the stirring operation, the driving motor outputs torque, thereby driving the driving gear to rotate in the power cabin, and then driving the transmission gear meshing with it to rotate, so as to drive the stirring mechanism to act and stir the sample.

[0009] Further, the stirring mechanism includes a tank body and a transmission shaft. The tank body is fixedly connected to the base. A feed port is provided on the tank body. The transmission shaft is rotatably connected to the tank body. The transmission gear is in transmission connection with the transmission shaft. A plurality of stirring blades are arranged circumferentially on the transmission shaft. A liquid flow channel is provided inside the transmission shaft. A distribution valve is provided at the water outlet of the liquid flow channel. The distribution valve is communicated with the detector. An adjusting assembly is provided at one end of the transmission shaft close to the bottom of the tank body. The adjusting assembly is used to adjust the on-off of the liquid flow channel.

[0010] A plurality of groups of stirring mechanisms are arranged on the base, which can realize the simultaneous processing of multiple groups of samples; the tank body is fixed on the base. The power mechanism can drive the transmission shaft to rotate, and then drive the stirring blades arranged circumferentially on the transmission shaft to rotate, so as to stir the samples in the tank body, thereby promoting the precipitation of pesticides in the samples; the samples and the extraction liquid can be added through the feed port on the tank body. After the stirring is completed, the adjusting assembly opens the liquid flow channel, and the liquid flows into the distribution valve from the liquid flow channel, and then flows into the detector through the distribution valve for detection.

[0011] Further, the adjusting assembly includes an adjusting motor, a movable ring, and an adjusting gear. An overflow hole and a transmission cavity are provided on the transmission shaft. The adjusting motor is fixedly connected to the inner wall of the transmission cavity. The output end of the adjusting motor is in transmission connection with the adjusting gear. The movable ring is rotatably connected to the transmission cavity. A toothed ring is provided at one end of the movable ring close to the adjusting gear. The toothed ring meshes with the adjusting gear.

[0012] The adjusting motor is the main power source of the adjusting assembly. When it is necessary to adjust the opening and closing of the liquid flow channel, the adjusting motor outputs torque to drive the adjusting gear to rotate. The adjusting gear transmits the torque to the toothed ring on the movable ring, thereby driving the movable ring to freely rotate along the transmission cavity, so as to control the opening and closing of the overflow hole. When stirring, the overflow hole is blocked by the movable ring, and the samples and the extraction liquid are evenly stirred in the tank body.

[0013] Further, filter holes and slag discharge holes are arranged circumferentially on the movable ring. A filter screen layer is provided on the filter holes. The filter holes and the slag discharge holes are communicated with the liquid flow channel;

[0014] During detection: the filter holes are in communication with the flow-through holes;

[0015] During cleaning: the slag discharge holes are in communication with the flow-through holes.

[0016] After stirring is completed, the movable ring rotates driven by the adjustment motor, turning the filter holes to a position where they coincide with the flow-through holes. Since the filter holes are covered with a filter mesh layer, only the clean extract can pass through, thus realizing the automatic separation of the sample and the extract; during cleaning, the cleaning liquid is added into the tank body from the feed port. After cleaning, the movable ring rotates driven by the adjustment motor, turning the slag discharge holes to a position where they coincide with the flow-through holes. The aperture of the slag discharge holes is the same as that of the flow-through holes, and the sample debris and the cleaning liquid can flow out of the tank body smoothly, thus realizing the automatic cleaning of the tank body.

[0017] Furthermore, the stirring blades are obliquely arranged on the transmission shaft. A diversion component and a circulation component are provided on the water-facing surface of the stirring blades. The diversion component is used to guide the sample, and the circulation component is used to promote the dispersion of the sample.

[0018] When the obliquely arranged stirring blades rotate, the mixed liquid of the sample and the extract in the tank body will flow upward along the inclined surface of the stirring blades. However, since the broken food samples will agglomerate together, the precipitation of pesticides is incomplete, which easily affects the detection accuracy. By guiding the mixed liquid through the diversion component to the circulation component, local circulation of the mixed liquid is realized at the circulation component, thereby promoting the dispersion of the sample debris and thus promoting the precipitation of pesticides.

[0019] Furthermore, the diversion component includes an upper plate and a lower plate. The upper plate is fixedly connected to the stirring blade, and the lower plate is slidably connected to the stirring blade. An over-flow gap is provided between the upper plate and the lower plate. A sliding groove is provided on the stirring blade, and a protruding part is provided on the lower plate. The protruding part is slidably connected to the sliding groove. Pressure sensors and support springs are respectively provided at both ends of the protruding part. The pressure sensors are fixedly connected to the inner wall of the sliding groove, and the pressure sensors are externally connected to a control system.

[0020] When the mixed liquid moves upward along the inclined surface of the stirring blade, it will flow through the over-flow gap between the upper plate and the lower plate. The cross-sectional area of this over-flow gap gradually decreases, which plays a role in accelerating the mixed liquid, thereby guiding the mixed liquid to the circulation component; the support spring plays a role in supporting the protruding part. Moreover, since the distribution of the sample debris in the mixed liquid is uneven, when the mixed liquid flows through the lower plate, under the action of the fluid resistance, it will push the lower plate to slide upward along the sliding groove. The more debris there is in the liquid, the greater the thrust on the lower plate, and the greater the tendency of the lower plate to slide upward along the sliding groove, and the greater the pressure on the pressure sensor by the protruding part; that is, the more debris there is in the liquid, the greater the pressure on the pressure sensor.

[0021] Further, the circulation component includes an arc-shaped plate and a bracket. One end of the arc-shaped plate is hinged to the top end of the stirring blade, the other end of the arc-shaped plate is slidably connected to the bracket. The arc-shaped plate is elastic, and the bracket is fixedly connected to the stirring blade.

[0022] When the liquid flows to the arc-shaped plate of the circulation component, the liquid will flow along the wall surface of the arc-shaped plate and finally flow out of the arc-shaped plate at a certain angle and thus impact the upper plate. Under the action of the impact force, the sample debris in the mixed liquid is dispersed, thereby promoting the precipitation of pesticides.

[0023] Further, the circulation component further includes a connecting rod, an electromagnet, a piston and an adjusting spring. The bracket is provided with a guiding groove and an adjusting groove. One side of the arc-shaped plate close to the bracket is provided with a guiding post, and the guiding post is slidably connected to the guiding groove. One end of the connecting rod is fixedly connected to the guiding post, the other end of the connecting rod is fixedly connected to the piston. One end of the adjusting spring is fixedly connected to the piston, the other end of the adjusting spring is fixedly connected to the wall surface of the adjusting groove, and the electromagnet is fixedly connected to the wall surface of the adjusting groove. The electromagnet and the piston are arranged opposite to each other. The electromagnet is externally connected to a control system, and the piston is made of ferromagnetic material.

[0024] Because the more debris content in the liquid, the greater the pressure received by the pressure sensor, the greater the current transmitted by the control system to the electromagnet. Under the action of the magnetic force, the piston is driven to move along the adjusting groove towards the electromagnet direction, and the adjusting spring is stretched under force. Under the action of the connecting rod, the guiding post on the arc-shaped plate will also move in the same direction along the guiding groove. And the arc-shaped plate is elastic, so the arc-shaped plate will bend towards the stirring blade side. At this time, the liquid flowing out of the arc-shaped plate will tend to vertically impact the upper plate, that is, the impact distance on the upper plate is shortened, the loss of speed is less, and the received impact force is greater, and the dispersion effect is better. That is, it realizes automatically controlling the dispersion strength according to the amount of debris in the liquid, thereby improving the dispersion efficiency.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. After the stirring is completed, the movable ring rotates under the drive of the adjusting motor to rotate the filter hole to the position coinciding with the flow-through hole. Because the filter hole is covered with a filter mesh layer, only the clean extraction liquid can pass through, that is, it realizes the automatic separation of the sample and the extraction liquid. When cleaning, the cleaning liquid is added into the tank body from the feed port. After the cleaning is completed, the movable ring rotates under the drive of the adjusting motor to rotate the slag discharge hole to the position coinciding with the flow-through hole. The aperture of the slag discharge hole is the same as that of the flow-through hole, and the sample debris and the cleaning liquid can flow out of the tank body smoothly, that is, it realizes the automatic cleaning of the tank body.

[0027] 2. When the obliquely arranged stirring blades rotate, the mixed liquid of the sample and the extraction liquid in the tank will flow upward along the inclined surface of the stirring blades. The diversion assembly is used to guide the mixed liquid and direct it to the circulation assembly, enabling the mixed liquid to achieve local circulation at the circulation assembly, thereby promoting the dispersion of the sample debris and facilitating the precipitation of pesticides.

[0028] 3. The more debris there is in the liquid, the greater the pressure exerted on the pressure sensor. As a result, the current transmitted by the control system to the electromagnet becomes larger. Under the action of the magnetic force, the piston is driven to move along the adjustment groove towards the electromagnet. Under the action of the connecting rod, the guide post on the arc-shaped plate also moves in the same direction along the guide groove. Therefore, the arc-shaped plate bends towards the side of the stirring blade. At this time, the liquid flowing out of the arc-shaped plate tends to vertically impact the upper plate, that is, the distance of impact on the upper plate is shortened, the loss of speed is less, and the impact force received is greater, resulting in a better dispersion effect. That is, it realizes automatic control of the dispersion intensity according to the amount of debris in the liquid, thereby improving the dispersion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a schematic diagram of the power mechanism of the present invention;

[0031] Figure 3 is a schematic diagram of the stirring mechanism of the present invention;

[0032] Figure 4 is a schematic diagram of the adjustment assembly of the present invention;

[0033] Figure 5 is Figure 4 a partial enlarged view of part A of

[0034] Figure 6 a cross-sectional view of the movable ring;

[0035] Figure 7 is a schematic diagram of the structure of the stirring blade;

[0036] Figure 8 is Figure 7 a partial enlarged view of part B of

[0037] Figure 9 a schematic diagram of the operation of the circulation assembly;

[0038] Figure 10 is Figure 9 a partial enlarged view of part C of

[0039] In the figure: 1. Base; 11. Power cabin; 2. Power mechanism; 21. Driving motor; 22. Driving gear; 23. Transmission gear; 3. Stirring mechanism; 31. Tank body; 311. Feed inlet; 32. Transmission shaft; 321. Liquid flow channel; 322. Flow-through hole; 323. Transmission cavity; 33. Stirring blade; 331. Chute; 34. Adjusting assembly; 341. Adjusting motor; 342. Movable ring; 3421. Tooth ring; 3422. Filter hole; 3423. Slag discharge hole; 343. Adjusting gear; 35. Flow guiding assembly; 351. Upper plate; 352. Lower plate; 3521. Protrusion; 353. Pressure sensor; 354. Support spring; 36. Circulation assembly; 361. Arc-shaped plate; 3611. Guide post; 362. Bracket; 3621. Guide groove; 3622. Adjusting groove; 363. Connecting rod; 364. Electromagnet; 365. Piston; 366. Adjusting spring; 4. Detector; 5. Distribution valve. Detailed implementation mode

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment: As Figure 1 - Figure 10 shown, the present invention provides a technical solution for a fully automatic detector for detecting food pesticide residues. The fully automatic detector includes a base 1, a power mechanism 2, a stirring mechanism 3 and a detector 4. The power mechanism 2 is fixedly connected to the base 1. The power mechanism 2 is in transmission connection with the stirring mechanism 3. The stirring mechanism 3 is fixedly connected to the base 1. The stirring mechanism 3 is communicated with the detector 4. The stirring mechanism 3 is used to convey the sample liquid to the detector 4, and the detector 4 is used to detect food pesticide residues.

[0042] The base 1 is used to provide stable support for the power mechanism 2 and the stirring mechanism 3. The power mechanism 2 is used to drive the stirring mechanism 3 to act. During the detection, first, the crushed sample is added into the stirring mechanism 3, and then the extraction liquid is added for stirring to promote the precipitation of the pesticide components in the sample. Finally, the liquid to be detected is introduced into the detector 4 for detection. The detector 4 can use immunoassay for detection. The detection method is generally as follows: the extracted liquid is added to the test card of the immunochromatographic test strip, and the substance to be detected in the sample begins to react with the labeled antibody in the test strip. There are specific capture antibodies or antigens on the test strip, and these antibodies or antigens will specifically bind to the target substance in the sample. If the sample contains the target substance, the target substance will react with the capture antibody on the test strip and form a visible signal on the test strip. The pesticide residue can be judged through the corresponding visual detection method.

[0043] A power cabin 11 is provided on the base 1. The power mechanism 2 includes a driving motor 21, a driving gear 22, and a transmission gear 23. The driving motor 21 is fixedly connected to the base 1. The output end of the driving motor 21 is in transmission connection with the driving gear 22. The driving gear 22 is rotatably connected to the base 1. The driving gear 22 and the transmission gear 23 are located in the power cabin 11. The transmission gear 23 meshes with the driving gear 22, and the transmission gear 23 is in transmission connection with the stirring mechanism 3.

[0044] The driving motor 21 is the main power source of the power mechanism 2. During the stirring operation, the driving motor 21 outputs torque, thereby driving the driving gear 22 to rotate in the power cabin 11, and then driving the transmission gear 23 meshing with it to rotate, so as to drive the stirring mechanism 3 to act and stir the sample.

[0045] The stirring mechanism 3 includes a tank body 31 and a transmission shaft 32. The tank body 31 is fixedly connected to the base 1. The tank body 31 is provided with a feed inlet 311. The transmission shaft 32 is rotatably connected to the tank body 31. The transmission gear 23 is in transmission connection with the transmission shaft 32. A plurality of stirring blades 33 are circumferentially arranged on the transmission shaft 32. A liquid flow channel 321 is provided in the transmission shaft 32. A distribution valve 5 is provided at the water outlet of the liquid flow channel 321. The distribution valve 5 is communicated with the detector 4. One end of the transmission shaft 32 close to the bottom of the tank body 31 is provided with an adjusting assembly 34, and the adjusting assembly 34 is used to adjust the on-off of the liquid flow channel 321.

[0046] Several sets of stirring mechanisms 3 are arranged on the base 1, enabling simultaneous processing of multiple sets of samples; the tank body 31 is fixed on the base 1, and the power mechanism 2 can drive the transmission shaft 32 to rotate, thereby driving the stirring blades 33 arranged circumferentially on the transmission shaft 32 to rotate, so as to stir the samples in the tank body 31, thereby promoting the precipitation of pesticides in the samples; the samples and the extraction liquid can be added through the feed port 311 on the tank body 31. After the stirring is completed, the adjusting component 34 opens the liquid flow channel 321, and the liquid flows into the distribution valve 5 from the liquid flow channel 321 and then into the detector 4 through the distribution valve 5 for detection.

[0047] The adjusting component 34 includes an adjusting motor 341, a movable ring 342 and an adjusting gear 343. An overflow hole 322 and a transmission cavity 323 are provided on the transmission shaft 32. The adjusting motor 341 is fixedly connected to the inner wall of the transmission cavity 323. The output end of the adjusting motor 341 is in transmission connection with the adjusting gear 343. The movable ring 342 is rotatably connected to the transmission cavity 323. A toothed ring 3421 is provided at one end of the movable ring 342 close to the adjusting gear 343, and the toothed ring 3421 meshes with the adjusting gear 343.

[0048] The adjusting motor 341 is the main power source of the adjusting component 34. When it is necessary to adjust the opening and closing of the liquid flow channel 321, the adjusting motor 341 outputs torque to drive the adjusting gear 343 to rotate. The adjusting gear 343 transmits the torque to the toothed ring 3421 on the movable ring 342, thereby driving the movable ring 342 to freely rotate along the transmission cavity 323, so as to control the opening and closing of the overflow hole 322. During stirring, the overflow hole 322 is blocked by the movable ring 342, and the samples and the extraction liquid are evenly stirred in the tank body 31.

[0049] Filter holes 3422 and slag discharge holes 3423 are arranged circumferentially on the movable ring 342. A filter screen layer is provided on the filter holes 3422. The filter holes 3422 and the slag discharge holes 3423 are communicated with the liquid flow channel 321;

[0050] During detection: the filter holes 3422 are communicated with the overflow hole 322;

[0051] During cleaning: the slag discharge holes 3423 are communicated with the overflow hole 322.

[0052] After the stirring is completed, the movable ring 342 rotates driven by the adjusting motor 341, and rotates the filter holes 3422 to the position where they coincide with the overflow holes 322. Since the filter holes 3422 are covered with a filter mesh layer, only the clean extraction liquid can pass through, that is, the automatic separation of the sample and the extraction liquid is realized; when cleaning, the cleaning liquid is added into the tank body 31 from the feed port 311. After the cleaning is completed, the movable ring 342 rotates driven by the adjusting motor 341, and rotates the slag discharge holes 3423 to the position where they coincide with the overflow holes 322. The aperture of the slag discharge holes 3423 is the same as that of the overflow holes 322, and the sample debris and the cleaning liquid can flow out of the tank body 31 smoothly, that is, the automatic cleaning of the tank body 31 is realized.

[0053] The stirring blades 33 are obliquely arranged on the transmission shaft 32. A flow guiding assembly 35 and a circulation assembly 36 are arranged on the water-facing surface of the stirring blades 33. The flow guiding assembly 35 is used to guide the sample, and the circulation assembly 36 is used to promote the dispersion of the sample.

[0054] When the obliquely arranged stirring blades 33 rotate, the mixed liquid of the sample and the extraction liquid in the tank body will flow upward along the inclined surface of the stirring blades 33. However, since the crushed food samples will agglomerate together, the precipitation of pesticides is incomplete, which easily affects the detection accuracy. The flow guiding assembly 35 guides the mixed liquid, and guides the mixed liquid to the circulation assembly 36, so that the mixed liquid realizes local circulation at the circulation assembly 36, thereby promoting the dispersion of the sample debris and thus promoting the precipitation of pesticides.

[0055] The flow guiding assembly 35 includes an upper plate 351 and a lower plate 352. The upper plate 351 is fixedly connected to the stirring blade 33, and the lower plate 352 is slidably connected to the stirring blade 33. An overflow gap is provided between the upper plate 351 and the lower plate 352. A chute 331 is provided on the stirring blade 33, and a protrusion 3521 is provided on the lower plate 352. The protrusion 3521 is slidably connected to the chute 331. Pressure sensors 353 and support springs 354 are respectively provided at both ends of the protrusion 3521. The pressure sensor 353 is fixedly connected to the inner wall of the chute 331, and the pressure sensor 353 is externally connected to a control system.

[0056] When the mixed liquid moves upward along the inclined surface of the stirring blade 33, it will flow through the flow-through gap between the upper plate 351 and the lower plate 352. The flow-through cross-section of this flow-through gap gradually shrinks, which plays a role in accelerating the mixed liquid, thereby guiding the mixed liquid to the circulation assembly; the support spring 354 plays a role in supporting the protrusion 3521. Moreover, since the distribution of sample debris in the mixed liquid is uneven, when the mixed liquid flows through the lower plate 352, under the action of fluid resistance, it will push the lower plate 352 to slide upward along the chute 331. The more debris there is in the liquid, the greater the thrust on the lower plate 352, and the greater the tendency of the lower plate 352 to slide upward along the chute 331, and the greater the pressure on the pressure sensor 353 by the protrusion 3521; that is, the more debris there is in the liquid, the greater the pressure on the pressure sensor 353.

[0057] The circulation assembly 36 includes an arc-shaped plate 361 and a bracket 362. One end of the arc-shaped plate 361 is hinged to the top end of the stirring blade 33, the other end of the arc-shaped plate 361 is slidably connected to the bracket 362, the arc-shaped plate 361 has elasticity, and the bracket 362 is fixedly connected to the stirring blade 33.

[0058] When the liquid flows to the arc-shaped plate 361 on the circulation assembly 36, the liquid will flow along the wall surface of the arc-shaped plate 361 and finally flow out of the arc-shaped plate 361 at a certain angle and hit the upper plate 351. Under the action of the impact force, the sample debris in the mixed liquid is dispersed, thereby promoting the precipitation of pesticides.

[0059] The circulation assembly 36 further includes a connecting rod 363, an electromagnet 364, a piston 365 and an adjusting spring 366. The bracket 362 is provided with a guide groove 3621 and an adjusting groove 3622. One side of the arc-shaped plate 361 close to the bracket 362 is provided with a guide post 3611. The guide post 3611 is slidably connected to the guide groove 3621. One end of the connecting rod 363 is fixedly connected to the guide post 3611, the other end of the connecting rod 363 is fixedly connected to the piston 365. One end of the adjusting spring 366 is fixedly connected to the piston 365, the other end of the adjusting spring 366 is fixedly connected to the wall surface of the adjusting groove 3622. The electromagnet 364 is fixedly connected to the wall surface of the adjusting groove 3622. The electromagnet 364 and the piston 365 are arranged facing each other. The electromagnet 364 is externally connected to a control system, and the piston 365 is made of ferromagnetic material.

[0060] Because the more debris there is in the liquid, the greater the pressure on the pressure sensor 353, the greater the current transmitted by the control system to the electromagnet 364. Under the action of the magnetic force, the piston 365 is driven to move along the adjustment groove 3622 towards the electromagnet 364, and the adjustment spring 366 is stretched under force. Under the action of the connecting rod 363, the guide post 3611 on the arc-shaped plate 361 also moves in the same direction along the guide groove 3621. Since the arc-shaped plate 361 is elastic, the arc-shaped plate 361 will bend towards the stirring blade 33. At this time, the liquid flowing out of the arc-shaped plate 361 will tend to vertically impact the upper plate 351, that is, the distance of impact on the upper plate 351 is shortened, the loss of speed is less, and the impact force received is greater, and the dispersion effect is better; that is, it realizes automatically controlling the dispersion intensity according to the amount of debris in the liquid, thereby improving the dispersion efficiency.

[0061] The working principle of the present invention: First, the crushed sample is added into the stirring mechanism 3, and then the extraction liquid is added for stirring to promote the precipitation of the pesticide components in the sample. Finally, the liquid to be detected is introduced into the detector 4 for detection; after the stirring is completed, the movable ring 342 rotates under the drive of the adjustment motor 341, and the filter hole 3422 is rotated to coincide with the flow-through hole 322, and the clean extraction liquid automatically flows to the detector 4; during cleaning, the cleaning liquid is added into the tank body 31 from the feed port 311. After the cleaning is completed, the movable ring 342 rotates under the drive of the adjustment motor 341, and the slag discharge hole 3423 is rotated to coincide with the flow-through hole 322, and the sample debris and the cleaning liquid can flow out of the tank body 31 smoothly, realizing the automatic cleaning of the tank body 31; when the obliquely arranged stirring blade 33 rotates, the mixed liquid of the sample and the extraction liquid in the tank body will flow upward along the inclined surface of the stirring blade 33, and the mixed liquid is guided by the diversion assembly 35 to the circulation assembly 36, so that the mixed liquid realizes local circulation at the circulation assembly 36, thereby promoting the dispersion of the sample debris and thus promoting the precipitation of the pesticide.

[0062] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A fully automatic detector for detecting pesticide residues in food, characterized in that: The fully automatic detector comprises a base (1), a power mechanism (2), a stirring mechanism (3) and a detector (4); the power mechanism (2) is firmly connected to the base (1); the power mechanism (2) is transmission-connected to the stirring mechanism (3); the stirring mechanism (3) is firmly connected to the base (1); the stirring mechanism (3) is communicated with the detector (4); the stirring mechanism (3) is used to deliver sample liquid to the detector (4); and the detector (4) is used to detect pesticide residues in food; The power mechanism (2) comprises a transmission gear (23); The stirring mechanism (3) comprises a tank body (31) and a transmission shaft (32), wherein the tank body (31) is tightly connected to the base (1), a feed port (311) is provided on the tank body (31), the transmission shaft (32) is rotationally connected to the tank body (31), the transmission gear (23) is transmission-connected to the transmission shaft (32), a plurality of stirring blades (33) are arranged circumferentially of the transmission shaft (32), a liquid flow channel (321) is provided in the transmission shaft (32), a distribution valve (5) is provided at a water outlet of the liquid flow channel (321), the distribution valve (5) is communicated with the detector (4), and an adjustment component (34) is provided at one end of the transmission shaft (32) close to the bottom of the tank body (31), the adjustment component (34) is used to adjust the on and off of the liquid flow channel (321); The regulating assembly (34) comprises a regulating motor (341), a movable ring (342) and an regulating gear (343); the transmission shaft (32) is provided with a flow hole (322) and a transmission cavity (323); the regulating motor (341) is tightly connected to the inner wall of the transmission cavity (323); the output end of the regulating motor (341) is transmission-connected to the regulating gear (343); the movable ring (342) is rotationally connected to the transmission cavity (323); a gear ring (3421) is provided at one end of the movable ring (342) close to the regulating gear (343); the gear ring (3421) is meshed with the regulating gear (343); The stirring blade (33) is arranged obliquely on the transmission shaft (32); a flow guide component (35) and a circulation component (36) are provided on the water-facing surface of the stirring blade (33); the flow guide component (35) is used to guide the sample, and the circulation component (36) is used to promote dispersion of the sample; The flow guide assembly (35) comprises an upper plate (351) and a lower plate (352); the upper plate (351) is fixedly connected to the stirring blade (33); the lower plate (352) is slidably connected to the stirring blade (33); a flow gap is provided between the upper plate (351) and the lower plate (352); a slide groove (331) is provided on the stirring blade (33); a protrusion (3521) is provided on the lower plate (352); the protrusion (3521) is slidably connected to the slide groove (331); a pressure sensor (353) and a support spring (354) are respectively provided at two ends of the protrusion (3521); the pressure sensor (353) is fixedly connected to the inner wall of the slide groove (331); and the pressure sensor (353) is externally connected to a control system.

2. The fully automatic detector for detecting pesticide residues in food according to claim 1, characterized in that: The base (1) is provided with a power cabin (11), and the power mechanism (2) further comprises a driving motor (21) and a driving gear (22), the driving motor (21) is firmly connected to the base (1), the output end of the driving motor (21) is drivingly connected to the driving gear (22), the driving gear (22) is rotatably connected to the base (1), the driving gear (22) and the transmission gear (23) are located in the power cabin (11), the transmission gear (23) is meshed with the driving gear (22), and the transmission gear (23) is drivingly connected to the stirring mechanism (3).

3. The fully automatic detector for detecting pesticide residues in food according to claim 1, characterized in that: The movable ring (342) is provided with filter holes (3422) and slag discharge holes (3423) in the circumferential direction, the filter holes (3422) are provided with filter screen layers, and the filter holes (3422) and slag discharge holes (3423) are in communication with the liquid flow channel (321); During detection: the filter hole (3422) is connected to the flow hole (322); During cleaning: the slag discharge hole (3423) is connected to the flow hole (322).

4. The fully automatic detector for detecting pesticide residues in food according to claim 1, characterized in that: The circulation assembly (36) comprises an arc-shaped plate (361) and a bracket (362); one end of the arc-shaped plate (361) is hinged to the top end of the stirring blade (33); the other end of the arc-shaped plate (361) is slidably connected to the bracket (362); the arc-shaped plate (361) is elastic; and the bracket (362) is firmly connected to the stirring blade (33).

5. The fully automatic detector for detecting pesticide residues in food according to claim 4, characterized in that: The circulation assembly (36) further comprises a connecting rod (363), an electromagnet (364), a piston (365) and an adjusting spring (366); the bracket (362) is provided with a guide groove (3621) and an adjusting groove (3622); a guide column (3611) is provided on a side of the arc plate (361) close to the bracket (362); the guide column (3611) is slidably connected to the guide groove (3621); one end of the connecting rod (363) is fastened to the guide column (3611). Then, the other end of the connecting rod (363) is tightly connected to the piston (365), one end of the adjusting spring (366) is tightly connected to the piston (365), the other end of the adjusting spring (366) is tightly connected to the wall surface of the adjusting groove (3622), the electromagnet (364) is tightly connected to the wall surface of the adjusting groove (3622), the electromagnet (364) and the piston (365) are arranged facing each other, the electromagnet (364) is externally connected to a control system, and the piston (365) is made of ferromagnetic material.

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