Vegetable oil pollutant detection device and detection method thereof

Abstract

The invention discloses a vegetable oil pollutant detection device and a detection method thereof, and relates to the technical field of intelligent sensor detection.The vegetable oil pollutant detection device comprises an electrode, a mounting base, an electrochemical workstation and an intelligent module, and the side walls of the electrochemical workstation and the intelligent module are fixedly connected with L-shaped plates; and the bottom of the L-shaped plate is connected with a lifting plate through a first lifting mechanism. According to the vegetable oil pollutant detection device and the detection method thereof, during sampling, vegetable oil at different depths can be quantitatively sampled and detected conveniently, and bubbles in the vegetable oil can be discharged conveniently; during detection, vegetable oil is conveniently stirred, the ion diffusion rate is increased, then stirring is stopped, the standing effect is achieved, a diffusion layer on the surface of an electrode is stable, and stirring is prevented from interfering a subsequent dissolution signal; after detection, residual vegetable oil on the surface of the electrode can be conveniently cleaned, so that the use effect and the service life of the electrode are ensured, and the accuracy of subsequent detection is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent sensor detection, in particular to a plant oil pollutant detection device and a detection method thereof. BACKGROUND

[0002] The intelligent electrochemical sensor belongs to the category of intelligent sensors, and its essence is an electrochemical sensor integrated with intelligent functions. The intelligent electrochemical sensor can detect some pollutants in plant oil. The core of the electrochemical sensor is to convert the chemical signal of the pollutant into a measurable electrical signal (current, voltage, resistance, etc.) through an electrochemical reaction. The "intelligence" is reflected in the integration of signal processing, automatic calibration, anti-interference algorithms and other functions, which improve the detection accuracy and stability, and can realize the detection of heavy metals, some pesticide residues and mycotoxins. It mainly includes an electrode, a mounting seat, an electrochemical workstation and an intelligent module. The electrode is installed on the mounting seat and electrically connected with the electrochemical workstation. The electrode directly contacts with the plant oil and performs electrochemical reaction. The electrochemical workstation is responsible for detecting and analyzing the potential change, and can detect the concentration of molecules / ions. The intelligent module is used for processing and intelligent control.

[0003] However, the existing plant oil pollutant detection device and detection method are inconvenient for quantitative sampling and detection of plant oil of different depths. At the same time, it is inconvenient to stir the plant oil during detection. In addition, there are gases dissolved in the plant oil, which may be adsorbed or involved in the reaction on the surface of the electrode, affecting the accuracy of the detection result. After detection is completed, it is inconvenient to clean the plant oil remaining on the surface of the electrode, which not only affects the effect and service life of the electrode, but also affects the accuracy of subsequent detection.

[0004] Therefore, we propose a plant oil pollutant detection device and a detection method thereof. SUMMARY

[0005] The present application aims to provide a plant oil pollutant detection device and a detection method thereof to solve the problems raised in the background.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a plant oil pollutant detection device, comprising an electrode arranged on an electrochemical sensor, a mounting seat, an electrochemical workstation and an intelligent module, the sidewall of the electrochemical workstation and the intelligent module is fixedly connected with an L-shaped plate, and the bottom of the L-shaped plate is connected with a lifting plate through a first lifting mechanism, the lifting plate is fixedly sleeved on the sidewall of the mounting seat, and the bottom of the L-shaped plate is fixedly connected with a fixing ring, the fixing ring and the lifting plate are fixedly connected with an extension cover, and the electrode is inserted into the bottom of the L-shaped plate, the fixing ring is provided with an adsorption mechanism for adsorbing and cleaning the residual plant oil on the surface of the electrode, a sampling mechanism for quantitatively sampling plant oil is arranged below the L-shaped plate, and the sampling mechanism can stir and discharge bubbles of plant oil.

[0007] As a preferred, the adsorption mechanism comprises two groups of symmetrical fixed blocks fixedly connected to the top of the L-shaped plate, the number of each group of fixed blocks is two, and the sidewall of each fixed block is fixedly connected with two first sleeve rods, the sidewall of the first sleeve rod is sleeved with a first sleeve pipe, the other end of the first sleeve pipe is fixedly connected with a connecting block, the sidewall of each first sleeve pipe is sleeved with a first spring, the top of the connecting block is fixedly connected with a mounting plate, the sidewall of the mounting plate is rotatably connected with a storage roller and a winding roller, and the storage roller is wound with a cleaning cloth, the other end of the cleaning cloth is fixed with the sidewall of the winding roller, and the rotation of the winding roller is driven by a first driving mechanism.

[0008] By adopting the above technical scheme, when the mounting seat and the electrode move downward during detection, the winding roller does not rotate, and when the mounting seat and the electrode move upward after detection is completed, the winding roller can be driven to rotate by the first driving mechanism, and the storage roller is driven to rotate, thereby driving the cleaning cloth to be conveyed, so that the cleaning cloth can adsorb and clean the residual plant oil on the surface of the electrode, the adsorbed cleaning cloth is wound on the winding roller, and under the action of the first spring, the cleaning cloth can be in contact with the sidewall of the electrode, ensuring the adsorption effect, thereby facilitating the adsorption and cleaning of the residual plant oil on the surface of the electrode, ensuring the use effect and service life, and ensuring the accuracy of subsequent detection.

[0009] As preferred, the bottom of the L-shaped plate is fixedly connected with a plurality of supporting legs, the sampling mechanism comprises a moving ring, and the moving ring is connected with the bottom of the L-shaped plate through a lifting module, a sampling cylinder is fixedly and telescopically arranged in the moving ring, the bottom of the sampling cylinder is rotationally connected with a rotating seat through a rotating mechanism, the rotation of the rotating seat is driven by a second driving mechanism, the top of the rotating seat is fixedly connected with a plurality of stirring plates, the side wall of the stirring plate is sleeved with a piston, the second lifting mechanism is arranged between the piston and the rotating seat, the top of the sampling cylinder is provided with a strip-shaped opening, the bottom of the strip-shaped opening is provided with a first switch mechanism, the side wall of the sampling cylinder is fixedly connected with an oil suction pipe, and the side wall of the oil suction pipe is provided with a second switch mechanism.

[0010] By adopting the above technical scheme, when the plant oil needs to be detected, the L-shaped plate is supported by the supporting legs, and the sampling cylinder is located above the plant oil, then the moving ring and the sampling cylinder are driven downward by the lifting module, and the sampling cylinder is lowered into the plant oil, so that the sampling depth can be adjusted as required, after the sampling depth is reached, the piston is driven downward by the second lifting mechanism, so that negative pressure is generated in the sampling cylinder, at the same time, the second switch mechanism is opened, and the plant oil at this depth can be sucked into the sampling cylinder through the oil suction pipe, after the sampling is completed, the second switch mechanism is closed, and the piston continues to move downward, so that negative pressure is generated above the plant oil in the sampling cylinder, thereby the air bubbles in the plant oil can be discharged, and the accuracy of detection is ensured.

[0011] As preferred, the first lifting mechanism comprises two symmetrical first T-shaped guide rods fixedly connected to the bottom of the L-shaped plate, the side wall of the first T-shaped guide rod is sleeved with a sliding block, the side wall of the sliding block is fixed to the side wall of the lifting plate, the side wall of each first T-shaped guide rod is sleeved with a second spring, the side wall of the L-shaped plate is rotationally connected to a rotating plate through a rotating shaft, the side wall of the rotating plate is provided with a first sliding groove, a first push pin is telescopically arranged in the first sliding groove, and the side wall of the first push pin is fixed to the side wall of the mounting seat, the top of the moving ring is fixedly connected with a first push rod, and the first push rod penetrates through the bottom of the L-shaped plate.

[0012] By adopting the above technical scheme, after the sampling is completed, the moving ring and the sampling cylinder are driven upward by the lifting module, at the same time, the rotating seat is driven upward, at the same time, the first push rod is driven upward, when the upper end of the first push rod abuts against the bottom of the rotating plate, the rotating plate is pushed to rotate clockwise along the rotating shaft, the first push pin is slid along the first sliding groove, the mounting seat and the electrode are driven to move downward, and the second spring is compressed.

[0013] As preferred, the first driving mechanism comprises a plurality of rectangular blocks arranged in an array and fixedly connected to the side wall of the winding roller, and the side wall of the fixed ring is provided with two symmetrically arranged moving rods, one end of the moving rod is fixedly connected with a first push plate, the side wall of the mounting seat is fixedly connected with a second push plate, the side wall of the second push plate is provided with a first inclined surface, the first push plate can slide on the first inclined surface, the side wall of the moving rod is sleeved with a third spring, and the side wall of the moving rod is fixedly sleeved with a connecting frame, the top of the connecting frame is fixedly connected with a mounting cover, and the mounting cover is slidably connected with a sliding plate, the bottom of the sliding plate and the mounting cover is fixedly connected with a fourth spring, the top of the sliding plate is fixedly connected with a plurality of triangular blocks, and the side wall of the triangular block is provided with a second inclined surface.

[0014] By adopting the above technical scheme, when the mounting seat moves downward, the two second push plates are driven to move downward, the upper end of the first push plate slides along the first inclined surface, thereby pushing the two first push plates to move away from each other, the third spring is compressed, and the mounting cover is driven to move through the connecting frame, thereby driving the plurality of triangular blocks to move, when the second inclined surface abuts against the side wall of the rectangular block, the second inclined surface is pushed into the mounting cover, and at the same time, the fourth spring is compressed, at this time, the winding roller does not rotate, after detection is completed, the moving ring and the sampling cylinder are driven to move downward and reset by the lifting module, at this time, the mounting seat can move upward and reset under the action of the second spring, and is removed from the vegetable oil, at the same time, when the mounting seat moves upward, the second push plate can move upward, when the first push plate gradually separates from the first inclined surface, the two first push plates can move close to each other and reset under the action of the third spring, and the mounting cover is driven to move through the connecting frame, when the side wall of the triangular block abuts against the rectangular block, the winding roller can be pushed to rotate.

[0015] As preferred, the second driving mechanism comprises a second sliding groove opened in the side wall of the rotating seat, and the second sliding groove comprises a spiral groove and a vertical groove connected in series, the side wall of the sampling cylinder is fixedly connected with a fixed plate, and the top of the fixed plate is provided with a second push rod, the lower end of the second push rod is fixedly connected with a second push pin, and the second push pin is inserted into the sliding groove, the side wall of the second push rod is fixedly sleeved with a blocking ring, and the side wall of the second push rod is sleeved with a fifth spring, the side wall of the fifth spring is sleeved with a first protective cover, and the two ends of the first protective cover are fixedly connected with the blocking ring and the fixed plate respectively.

[0016] When the upper end of the first push rod abuts against the bottom of the L-shaped plate, the second push rod no longer moves, when the rotating seat continues to move upward, the fifth spring is compressed, and the second push pin slides downward along the spiral groove, thereby being capable of pushing the rotating seat to rotate, when the rotating seat rotates, the stirring plate is driven to rotate, thereby being capable of stirring the plant oil in the sampling cylinder, improving the ion diffusion rate, and ensuring the accuracy of subsequent detection, after the stirring is completed, when the second push pin slides downward along the vertical groove, at this time, the rotating seat and the stirring plate no longer rotate, that is, the plant oil is no longer stirred, and the electrode surface diffusion layer is stable after standing for seconds to minutes, thereby avoiding the interference of stirring on the subsequent elution signal, and ensuring the accuracy of detection, during detection, the intelligent module is intelligently controlled, and the electrochemical workstation is used to detect and analyze the potential change, thereby realizing the detection of the pollutant.

[0017] Preferably, the second lifting mechanism comprises a second sleeve fixedly connected to the bottom of the piston, and a second sleeve rod is inserted into the second sleeve, the lower end of the second sleeve rod is fixed to the top of the rotating seat, and the sidewall of the second sleeve is sleeved with a sixth spring, the bottom of the piston is fixedly connected with an iron block, and the top of the rotating seat is fixedly connected with an annular electromagnet.

[0018] By adopting the above technical scheme, the electromagnet is electrified, and the electromagnet attracts the iron block after being electrified, so that the piston moves downward, and the sixth spring is gradually compressed.

[0019] Preferably, the first switch mechanism comprises a fixed frame fixedly connected to the bottom of the strip-shaped opening, and two third sleeves are fixedly connected to the sidewall of the fixed frame, a third sleeve rod is inserted into each third sleeve, the end of the third sleeve rod is fixedly connected with a sealing plate, the sidewall of each third sleeve is sleeved with a seventh spring, and the top of the sealing plate is provided with a third inclined surface.

[0020] By adopting the above technical scheme, the first lifting mechanism drives the mounting seat and the electrode to move downward, and the electrode is inserted into the strip-shaped opening, and the inner wall of the strip-shaped opening is provided with a sealing ring, so as to ensure sealing, when the bottom of the mounting seat abuts against the top of the third inclined surface, the sealing plate is pushed to move, and the seventh spring is compressed, at this time, the first switch mechanism is opened, so that the electrode can be inserted into the plant oil in the sampling cylinder, the sealing plate and the fixed frame are provided with an elastic rubber plate, and the top of the piston is provided with a rectangular groove, so as to ensure that the fixed frame and the sealing plate can be attached to the bottom of the rectangular groove, thereby ensuring that the piston can be attached to the top of the sampling cylinder, and further ensuring that the plant oil in the sampling cylinder can be completely discharged.

[0021] Preferably, the second switch mechanism comprises a fixed cover fixedly inserted in the sidewall of the oil extraction pipe, and a sealing block is slidably connected in the fixed cover, a through hole is formed in the top of the sealing block, two symmetrically arranged first supporting blocks are fixedly connected to the sidewall of the sealing block, two symmetrically arranged second T-shaped guide rods are fixedly connected to the sidewall of the first supporting blocks, a second supporting block is sleeved on the sidewall of the second T-shaped guide rods, the second supporting block is fixed to the sidewall of the fixed cover, an eighth spring is sleeved on the sidewall of each second T-shaped guide rod, a second protective cover is sleeved on the sidewall of the eighth spring, the two ends of the second protective cover are fixed to the first supporting blocks and the second supporting blocks, a pushing block is inserted in the sidewall of the sampling cylinder and fixed to the sidewall of the sealing block, a first vertical plate is fixedly connected to the bottom of the piston, a first inclined plate is fixedly connected to the lower end of the first vertical plate, a second vertical plate is fixedly connected to the lower end of the first inclined plate, a second inclined plate is fixedly connected to the lower end of the second vertical plate, a third vertical plate is fixedly connected to the lower end of the second inclined plate, and an avoiding groove is formed in the top of the rotating seat.

[0022] When the piston moves downward, the pushing block slides along the third vertical plate and the second inclined plate to the sidewall of the second vertical plate, the sealing block moves away from the fixed cover under the action of the eighth spring, the through hole coincides with the oil extraction pipe, and the second switch mechanism is opened.

[0023] The plant oil pollution substance detection method adopts the plant oil pollution substance detection device, and comprises the following steps. S1: When it is necessary to detect the plant oil, the L-shaped plate is supported by the supporting legs, the sampling cylinder is located above the plant oil, the moving ring and the sampling cylinder are driven by the lifting module to move downward, the sampling cylinder is lowered into the plant oil, the depth of sampling is adjusted as required, the electromagnet is powered on after the sampling depth is reached, the electromagnet attracts the iron block, the piston moves downward, the sixth spring is gradually compressed, and negative pressure is generated in the sampling cylinder; S2: When the piston moves downward, the pushing block slides along the third vertical plate and the second inclined plate to the sidewall of the second vertical plate, the sealing block moves away from the fixed cover under the action of the eighth spring, the through hole coincides with the oil extraction pipe, and the second switch mechanism is opened. At this time, the plant oil at the depth is drawn into the sampling cylinder through the oil extraction pipe, when the pushing block slides along the first inclined plate to the sidewall of the first vertical plate, the sealing block slides into the fixed cover, the through hole is misaligned with the oil extraction pipe, the eighth spring is compressed, the second switch mechanism is closed, the plant oil is quantitatively sampled, and when the piston continues to move downward, negative pressure is generated above the plant oil in the sampling cylinder, air bubbles in the plant oil are discharged, and the accuracy of detection is ensured. S3: after the sampling is completed, the lifting module drives the moving ring and the sampling cylinder to move upwards, at the same time, the first push rod is driven to move upwards, when the upper end of the first push rod abuts against the bottom of the rotating plate, the rotating plate is pushed to rotate clockwise along the rotating shaft, the first push pin slides along the first sliding groove, and the mounting seat and the electrode are driven to move downwards, the second spring is compressed, the electrode is inserted into the strip-shaped opening, and the inner wall of the strip-shaped opening is provided with a sealing ring, which can ensure sealing, when the bottom of the mounting seat abuts against the top of the third inclined surface, the sealing plate is pushed to move, at the same time, the seventh spring is compressed, at this time, the first switch mechanism is opened, so that the electrode can enter the vegetable oil in the sampling cylinder; S4: when the upper end of the first push rod abuts against the bottom of the L-shaped plate, the second push rod is pushed to move downwards, at the same time, the fifth spring is compressed, and the second push pin slides downwards along the spiral groove, so as to push the rotating seat to rotate, when the rotating seat rotates, the stirring plate is driven to rotate, so as to stir the vegetable oil in the sampling cylinder, improve the ion diffusion rate, and ensure the accuracy of subsequent detection, after stirring is completed, when the second push pin slides downwards along the vertical groove, at this time, the rotating seat and the stirring plate no longer rotate, that is, the vegetable oil is no longer stirred, and the electrode surface diffusion layer is stable after standing for 30 seconds to 1 minute, so as to avoid stirring interference with subsequent elution signal and ensure the accuracy of detection. During detection, the intelligent module is intelligently controlled, at the same time, the electrochemical workstation detects and analyzes the potential change, and the detection of pollutants is realized; S5: when the mounting seat moves downwards during detection, the two second push plates are driven to move downwards, so that the upper end of the first push plate slides along the first inclined surface, thereby pushing the two first push plates to move away from each other, the third spring is compressed, and the mounting cover is driven to move through the connecting frame, thereby driving the plurality of triangular blocks to move, when the second inclined surface abuts against the side wall of the rectangular block, the second inclined surface is pushed to retract into the mounting cover, at the same time, the fourth spring is compressed, at this time, the winding roller does not rotate; S6: After the detection is completed, the lifting module drives the moving ring and the sampling cylinder to move downward to reset, at this time, the mounting seat can move upward to reset under the action of the second spring and move out of the vegetable oil, at the same time, when the mounting seat moves upward, it can drive the second push plate to move upward, when the first push plate gradually separates from the first inclined surface, the two first push plates can move close to each other to reset under the action of the third spring, and drive the mounting cover to move through the connecting frame, when the side wall of the triangular block abuts against the rectangular block, it can push the winding roller to rotate, at the same time, drive the storage roller to rotate, thereby conveying the cleaning cloth, so that the cleaning cloth can adsorb and clean the vegetable oil remaining on the surface of the electrode, the cleaned cleaning cloth is wound on the winding roller, and under the action of the first spring, the cleaning cloth can contact the side wall of the electrode, ensuring the adsorption effect, thereby facilitating the adsorption and cleaning of the vegetable oil remaining on the surface of the electrode, ensuring the use effect and service life, and ensuring the accuracy of subsequent detection; S7: Then, the electromagnet is powered off, at this time, the piston can move upward to reset under the action of the sixth spring, at this time, the vegetable oil in the sampling cylinder can be squeezed out through the oil extraction pipe, the telescopic rubber plate is arranged between the sealing plate and the fixed frame, at the same time, the top of the piston is provided with a rectangular groove, ensuring that the fixed frame and the sealing plate can be attached to the bottom of the rectangular groove, so that the piston can be attached to the top of the sampling cylinder, thereby ensuring that the vegetable oil in the sampling cylinder can be completely discharged.

[0024] In summary, Advantage one: facilitating quantitative sampling and detection of vegetable oil of different depths, and facilitating the discharge of air bubbles in the vegetable oil, thereby ensuring the accuracy of subsequent detection; Advantage two: facilitating stirring of the vegetable oil during detection, improving the ion diffusion rate, then stopping stirring to achieve the effect of standing, so that the diffusion layer on the surface of the electrode is stable, avoiding interference of stirring on the subsequent dissolution signal, thereby ensuring the accuracy of detection; Advantage three: facilitating cleaning of the vegetable oil remaining on the surface of the electrode, thereby ensuring the use effect and service life, and ensuring the accuracy of subsequent detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application from another perspective; Figure 3 It is a schematic diagram of the local cross-sectional structure of the telescopic cover in the present application; Figure 4 It is a schematic diagram of the structure of the first driving mechanism in the present application; Figure 5 It is a schematic diagram of the local cross-sectional structure of the sampling cylinder in the present application; Figure 6 Another perspective view of the partial sectional structure of the sampling cylinder in the present application; Figure 7 A position diagram of the first switch mechanism in the present application; Figure 8 A perspective view of Figure 2 An enlarged view of A in the present application; Figure 9 A perspective view of Figure 3 An enlarged view of B in the present application; Figure 10 A perspective view of Figure 4 An enlarged view of C in the present application; Figure 11 A perspective view of Figure 5 An enlarged view of D in the present application; Figure 12 A perspective view of Figure 6 An enlarged view of E in the present application; Figure 13 A perspective view of Figure 7 An enlarged view of F in the present application; Figure 14 A perspective view of Figure 10 An enlarged view of G in the present application.

[0026] In the figure: 101, electrode; 102, mounting seat; 103, electrochemical workstation; 104, intelligent module; 201, mounting plate; 202, winding roller; 203, storage roller; 204, cleaning cloth; 205, fixed block; 206, first sleeve rod; 207, first sleeve; 208, first spring; 209, connecting block; 301, moving ring; 302, sampling cylinder; 303, rotating seat; 304, lifting module; 305, strip-shaped opening; 306, stirring plate; 307, piston; 308, oil extraction pipe; 401, rectangular block; 402, moving rod; 403, connecting frame; 404, third spring; 405, first push plate; 406, second push plate; 407, first inclined surface; 408, mounting cover; 409, sliding plate; 410, fourth spring; 411, triangular block; 412, second inclined surface; 501, sliding block; 502, first T-shaped guide rod; 503, second spring; 504, rotating plate; 505, rotating shaft; 506, first sliding groove; 507, first push pin; 508, first push rod; 601, second sleeve; 602, second sleeve rod; 603, sixth spring; 604, iron block; 605, electromagnet; 701, helical groove; 702, vertical groove; 703, fixed plate; 704, second push rod; 705, blocking ring; 706, fifth spring; 707, first protective cover; 708, second push pin; 801, fixed cover; 802, sealing block; 803, through hole; 804, first support block; 805, second T-shaped guide rod; 806, second support block; 807, eighth spring; 808, second protective cover; 809, push block; 810, second vertical plate; 811, second inclined plate; 812, third vertical plate; 813, first inclined plate; 814, first vertical plate; 815, avoiding groove; 901, fixed frame; 902, third inclined surface; 903, third sleeve; 904, third sleeve rod; 905, seventh spring; 906, sealing plate; 10, lifting plate; 11, telescopic cover; 12, L-shaped plate; 13, fixed ring; 14, supporting leg. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] Embodiment 1 Please refer to Figures 1-14, one of the plant oil pollution detection devices in the drawing, including electrode 101, mounting seat 102, electrochemical workstation 103 and intelligent module 104 arranged on the electrochemical sensor, the electrode 101 of the intelligent electrochemical sensor is the core component to realize the conversion of chemical quantity to electrical signal, its design, material and structure directly affect the sensitivity, selectivity and stability of the sensor. According to the different functions, it is composed of three electrode system of working electrode, reference electrode and counter electrode, and two electrode system of working electrode + counter electrode will also be used in part of simplified structure, the working electrode directly reacts with the measured substance such as oxidation and reduction, generates electrical signal current or voltage related to the concentration of the substance, the reference electrode provides stable reference potential, ensures the potential measurement of the working electrode accurate, avoids the potential drift caused by environmental changes such as temperature and pH, the counter electrode forms a current loop with the working electrode, undertakes the electron transfer generated by the working electrode reaction, that is, "auxiliary electrode", avoids the reference electrode from being polarized to affect the stability of the reference potential, the core of the electrochemical workstation is to accurately control the electrode potential or current, and at the same time measure the current, potential, impedance and other parameters in the electrochemical reaction process, so as to analyze the reaction kinetics, substance concentration, electrode interface characteristics and other parameters. Its working principle is based on the synergistic effect of three electrode system working electrode, reference electrode and counter electrode, electrode 101 is installed on mounting seat 102 and electrically connected with electrochemical workstation 103, intelligent module 104 mainly includes signal conditioning module, microprocessor, storage module, communication module and power management module, electrode 101, mounting seat 102, electrochemical workstation 103 and intelligent module 104 are well known in the art, and will not be described here, the side wall of electrochemical workstation 103 and intelligent module 104 is fixedly connected with L-shaped plate 12, and the bottom of L-shaped plate 12 is connected with lifting plate 10 through first lifting mechanism, lifting plate 10 is fixedly sleeved on the side wall of mounting seat 102, and the bottom of L-shaped plate 12 is fixedly connected with fixing ring 13, fixing ring 13 and lifting plate 10 are fixedly connected with telescopic cover 11, and electrode 101 is inserted into the bottom of L-shaped plate 12, fixing ring 13 is provided with adsorption mechanism for adsorbing and cleaning the residual plant oil on the surface of electrode 101, sampling mechanism is arranged below L-shaped plate 12 for quantitative sampling of plant oil, and the sampling mechanism can stir and discharge bubbles of plant oil.

[0029] The adsorption mechanism includes two groups of symmetrically arranged fixed blocks 205 fixedly connected to the top of the L-shaped plate 12, each group of fixed blocks 205 has two, and the side wall of each fixed block 205 is fixedly connected to two first rods 206, the side wall of the first rod 206 is sleeved with a first sleeve 207, and the other end of the first sleeve 207 is fixedly connected to a connecting block 209, the side wall of each first sleeve 207 is sleeved with a first spring 208, and the top of the connecting block 209 is fixedly connected to a mounting plate 201, the side wall of the mounting plate 201 is rotatably connected to a storage roller 203 and a winding roller 202, and a cleaning cloth 204 is wound around the storage roller 203, the other end of the cleaning cloth 204 is fixed to the side wall of the winding roller 202, and the rotation of the winding roller 202 is driven by the first driving mechanism. During detection, when the mounting seat 102 and the electrode 101 move downward, the winding roller 202 does not rotate. After the detection is completed, when the mounting seat 102 and the electrode 101 move upward, the winding roller 202 can be driven to rotate by the first driving mechanism, and the storage roller 203 can be driven to rotate, thereby driving the cleaning cloth 204 to be transported, so that the cleaning cloth 204 can adsorb and clean the vegetable oil remaining on the surface of the electrode 101. The cleaning cloth 204 after adsorption is wound on the winding roller 202, and under the action of the first spring 208, the cleaning cloth 204 can be brought into contact with the side wall of the electrode 101 to ensure the adsorption effect, thereby facilitating the adsorption and cleaning of the vegetable oil remaining on the surface of the electrode 101, ensuring its effectiveness and life, and ensuring the accuracy of subsequent detection.

[0030] The bottom of the L-shaped plate 12 is fixedly connected with a plurality of supporting legs 14, the sampling mechanism comprises a moving ring 301, and the moving ring 301 is connected with the bottom of the L-shaped plate 12 through a lifting module 304. The lifting module 304 is a known technology in the technical field, and thus will not be described here. A sampling cylinder 302 is fixedly and telescopically arranged in the moving ring 301. The bottom of the sampling cylinder 302 is rotatably connected with a rotating seat 303 through a rotating mechanism. The rotation of the rotating seat 303 is driven by a second driving mechanism. The top of the rotating seat 303 is fixedly connected with a plurality of stirring plates 306. The stirring plates 306 are sleeved with pistons 307. The pistons 307 and the rotating seat 303 are provided with a second lifting mechanism. The top of the sampling cylinder 302 is provided with a strip-shaped opening 305. The bottom of the strip-shaped opening 305 is provided with a first switch mechanism. The side wall of the sampling cylinder 302 is fixedly connected with an oil suction pipe 308. The side wall of the oil suction pipe 308 is provided with a second switch mechanism. When the plant oil needs to be detected, the L-shaped plate 12 is supported by the supporting legs 14. At the same time, the sampling cylinder 302 is located above the plant oil. Then, the moving ring 301 and the sampling cylinder 302 are driven downward by the lifting module 304, and the sampling cylinder 302 is lowered into the plant oil, so as to conveniently adjust the sampling depth according to the requirement. After the sampling depth is reached, the piston 307 is driven downward by the second lifting mechanism, so that negative pressure is generated in the sampling cylinder 302. At the same time, the second switch mechanism is opened, so that the plant oil at the depth is sucked into the sampling cylinder 302 through the oil suction pipe 308. After the sampling is completed, the second switch mechanism is closed, and the piston 307 continues to move downward, so that negative pressure is generated above the plant oil in the sampling cylinder 302, thereby conveniently discharging the air bubbles in the plant oil, and ensuring the accuracy of detection.

[0031] The first lifting mechanism comprises two symmetrically arranged first T-shaped guide rods 502 fixedly connected at the bottom of the L-shaped plate 12, the side walls of the first T-shaped guide rods 502 are sleeved with sliding blocks 501, the sliding blocks 501 are fixed to the side walls of the lifting plate 10, the side walls of each first T-shaped guide rod 502 are sleeved with second springs 503, the side walls of the L-shaped plate 12 are rotationally connected with a rotating plate 504 through a rotating shaft 505, the side walls of the rotating plate 504 are provided with first sliding grooves 506, first push pins 507 are inserted into the first sliding grooves 506, the first push pins 507 are fixed to the side walls of the mounting seat 102, the top of the moving ring 301 is fixedly connected with a first push rod 508, the first push rod 508 penetrates through the bottom of the L-shaped plate 12, after sampling is completed, the moving ring 301 and the sampling cylinder 302 are driven by the lifting module 304 to move upwards, at the same time, the rotating seat 303 is driven to move upwards, at the same time, the first push rod 508 is driven to move upwards, when the upper end of the first push rod 508 abuts against the bottom of the rotating plate 504, the rotating plate 504 is pushed to rotate clockwise along the rotating shaft 505, the first push pin 507 is driven to slide along the first sliding groove 506, and the mounting seat 102 and the electrode 101 are driven to move downwards, and the second spring 503 is compressed.

[0032] The first driving mechanism comprises a plurality of arrayed rectangular blocks 401 fixedly connected to the side wall of the winding roller 202, and the side wall of the fixed ring 13 is provided with two symmetrically arranged moving rods 402, one end of the moving rod 402 is fixedly connected with a first push plate 405, the side wall of the mounting seat 102 is fixedly connected with a second push plate 406, the side wall of the second push plate 406 is provided with a first inclined surface 407, so that the first push plate 405 can slide on the first inclined surface 407, the side wall of the moving rod 402 is sleeved with a third spring 404, and the side wall of the moving rod 402 is fixedly sleeved with a connecting frame 403, the top of the connecting frame 403 is fixedly connected with a mounting cover 408, and the mounting cover 408 is slidably connected with a sliding plate 409, the bottom of the sliding plate 409 and the mounting cover 408 is fixedly connected with a fourth spring 410, the top of the sliding plate 409 is fixedly connected with a plurality of triangular blocks 411, and the side wall of the triangular block 411 is provided with a second inclined surface 412, when the mounting seat 102 moves downward, the two second push plates 406 are driven to move downward, so that the upper end of the first push plate 405 slides along the first inclined surface 407, thereby pushing the two first push plates 405 to move away from each other, the third spring 404 is compressed, and the mounting cover 408 is driven to move through the connecting frame 403, thereby driving the plurality of triangular blocks 411 to move, when the second inclined surface 412 abuts against the side wall of the rectangular block 401, the second inclined surface 412 can be pushed into the mounting cover 408, and at the same time, the fourth spring 410 is compressed, at this time, the winding roller 202 does not rotate, after detection is completed, the moving ring 301 and the sampling cylinder 302 are driven to move downward by the lifting module 304, at this time, the mounting seat 102 can be driven to move upward by the second spring 503, and is removed from the vegetable oil, at the same time, when the mounting seat 102 moves upward, the second push plate 406 can be driven to move upward, when the first push plate 405 gradually separates from the first inclined surface 407, the two first push plates 405 can be driven to move close to each other by the third spring 404, and the mounting cover 408 is driven to move through the connecting frame 403, when the side wall of the triangular block 411 abuts against the rectangular block 401, the winding roller 202 can be driven to rotate.

[0033] The second driving mechanism comprises a second sliding groove formed in the side wall of the rotating seat 303, and the second sliding groove comprises a spiral groove 701 and a vertical groove 702 connected in head-to-tail mode. The side wall of the sampling cylinder 302 is fixedly connected with a fixed plate 703, the top of the fixed plate 703 is inserted with a second push rod 704, the lower end of the second push rod 704 is fixedly connected with a second push pin 708, the second push pin 708 is inserted in the sliding groove, the side wall of the second push rod 704 is fixedly sleeved with a stop ring 705, the side wall of the second push rod 704 is sleeved with a fifth spring 706, the side wall of the fifth spring 706 is sleeved with a first protective cover 707, and the two ends of the first protective cover 707 are fixedly connected with the stop ring 705 and the fixed plate 703 respectively. When the upper end of the first push rod 508 abuts against the bottom of the L-shaped plate 12, the second push rod 704 no longer moves. When the rotating seat 303 continues to move upward, the fifth spring 706 is compressed, and the second push pin 708 slides downward along the spiral groove 701, so that the rotating seat 303 is pushed to rotate. When the rotating seat 303 rotates, the stirring plate 306 is driven to rotate, so that the plant oil in the sampling cylinder 302 can be stirred, the ion diffusion rate is improved, the accuracy of subsequent detection is ensured, and after the stirring is completed, when the second push pin 708 slides downward along the vertical groove 702, at this time, the rotating seat 303 and the stirring plate 306 no longer rotate, i.e. the plant oil is no longer stirred. After 30 seconds to 1 minute, the surface diffusion layer of the electrode 101 is stable, the subsequent elution signal is prevented from being disturbed by stirring, and the accuracy of detection is ensured. During detection, the intelligent module 104 is intelligently controlled, and at the same time, the electrochemical workstation 103 detects and analyzes the potential change, so that the detection of the pollutant is realized.

[0034] The second lifting mechanism comprises a second sleeve 601 fixedly connected to the bottom of the piston 307, and a second sleeve rod 602 inserted in the second sleeve 601. The lower end of the second sleeve rod 602 is fixed to the top of the rotating seat 303, and the side wall of the second sleeve 601 is sleeved with a sixth spring 603. The bottom of the piston 307 is fixedly connected with an iron block 604, and the top of the rotating seat 303 is fixedly connected with an annular electromagnet 605. The electromagnet 605 is energized, and after the electromagnet 605 is energized, the iron block 604 is attracted, so that the piston 307 moves downward, and the sixth spring 603 is gradually compressed.

[0035] The first switch mechanism comprises a fixed frame 901 fixedly connected at the bottom of the strip-shaped opening 305, and the side wall of the fixed frame 901 is fixedly connected with two third sleeves 903, the third sleeve 903 is provided with a third sleeve rod 904 inserted therein, and the end of the third sleeve rod 904 is fixedly connected with a sealing plate 906, the side wall of each third sleeve 903 is sleeved with a seventh spring 905, and the top of the sealing plate 906 is provided with a third inclined surface 902. The mounting seat 102 and the electrode 101 are driven to move downward by the first lifting mechanism, and the electrode 101 is inserted into the strip-shaped opening 305, and the inner wall of the strip-shaped opening 305 is provided with a sealing ring, which can ensure sealing. When the bottom of the mounting seat 102 abuts against the top of the third inclined surface 902, the sealing plate 906 can be pushed to move, and at the same time, the seventh spring 905 is compressed. At this time, the first switch mechanism is opened, so that the electrode 101 can be inserted into the vegetable oil in the sampling cylinder 302. The sealing plate 906 and the fixed frame 901 are provided with an elastic rubber plate, and at the same time, the top of the piston 307 is provided with a rectangular groove, so that the fixed frame 901 and the sealing plate 906 can be attached to the bottom of the rectangular groove, thereby ensuring that the piston 307 can be attached to the top of the sampling cylinder 302, and further ensuring that the vegetable oil in the sampling cylinder 302 can be completely discharged.

[0036] The second switch mechanism comprises a fixed cover 801 fixedly inserted into the side wall of the oil extraction pipe 308, and the fixed cover 801 is slidably connected with a sealing block 802, the top of the sealing block 802 is provided with a through hole 803, and the side wall of the sealing block 802 is fixedly connected with two symmetrically arranged first support blocks 804, the side wall of the first support block 804 is fixedly connected with two symmetrically arranged second T-shaped guide rods 805, the side wall of the second T-shaped guide rod 805 is sleeved with a second support block 806, and the second support block 806 is fixed to the side wall of the fixed cover 801. The side wall of each second T-shaped guide rod 805 is sleeved with an eighth spring 807, the side wall of the eighth spring 807 is sleeved with a second protective cover 808, and the two ends of the second protective cover 808 are fixed to the first support block 804 and the second support block 806. The side wall of the sampling cylinder 302 is inserted with a pushing block 809, and the pushing block 809 is fixed to the side wall of the sealing block 802. The bottom of the piston 307 is fixedly connected with a first vertical plate 814, the lower end of the first vertical plate 814 is fixedly connected with a first inclined plate 813, the lower end of the first inclined plate 813 is fixedly connected with a second vertical plate 810, the lower end of the second vertical plate 810 is fixedly connected with a second inclined plate 811, the lower end of the second inclined plate 811 is fixedly connected with a third vertical plate 812, and the top of the rotating seat 303 is provided with an avoiding groove 815. When the piston 307 moves downward, when the pushing block 809 slides along the third vertical plate 812 and the second inclined plate 811 to the side wall of the second vertical plate 810, the sealing block 802 can move away from the fixed cover 801 under the action of the eighth spring 807, so that the through hole 803 coincides with the oil extraction pipe 308. At this time, the second switch mechanism is opened.

[0037] The plant oil pollution detection method adopts the plant oil pollution detection device, and comprises the following steps: S1: When it is necessary to detect the plant oil, the L-shaped plate 12 is supported by the supporting leg 14, and the sampling cylinder 302 is located above the plant oil, then the lifting module 304 drives the moving ring 301 and the sampling cylinder 302 to move downward, and the sampling cylinder 302 is lowered into the plant oil, so that the sampling depth can be adjusted according to the requirement, after the sampling depth is reached, the electromagnet 605 is powered on, the electromagnet 605 is attracted to the iron block 604 after being powered on, the piston 307 moves downward, and the sixth spring 603 is gradually compressed, so that negative pressure is generated in the sampling cylinder 302; S2: When the piston 307 moves downward, when the push block 809 slides along the third vertical plate 812 and the second inclined plate 811 to the side wall of the second vertical plate 810, the sealing block 802 can move away from the fixed cover 801 under the action of the eighth spring 807, so that the through hole 803 coincides with the oil suction pipe 308, at this time, the second switch mechanism is opened, at this time, the plant oil at this depth can be sucked into the sampling cylinder 302 through the oil suction pipe 308, when the push block 809 slides along the first inclined plate 813 to the side wall of the first vertical plate 814, the sealing block 802 can be pushed to slide into the fixed cover 801, so that the through hole 803 is staggered with the oil suction pipe 308, and at the same time, the eighth spring 807 is compressed, at this time, the second switch mechanism is closed, so as to facilitate quantitative sampling of the plant oil, when the piston 307 continues to move downward, negative pressure can be generated above the plant oil in the sampling cylinder 302, so as to discharge the bubbles in the plant oil, and ensure the accuracy of detection; S3: After sampling is completed, the lifting module 304 drives the moving ring 301 and the sampling cylinder 302 to move upward, at the same time, the first push rod 508 is driven to move upward, when the upper end of the first push rod 508 abuts against the bottom of the rotating plate 504, the rotating plate 504 can be pushed to rotate clockwise along the rotating shaft 505, so that the first push pin 507 slides along the first sliding groove 506, and drives the mounting seat 102 and the electrode 101 to move downward, the second spring 503 is compressed, so that the electrode 101 is inserted into the strip-shaped opening 305, and the inner wall of the strip-shaped opening 305 is provided with a sealing ring, which can ensure sealing, when the bottom of the mounting seat 102 abuts against the top of the third inclined surface 902, the sealing plate 906 can be pushed to move, at the same time, the seventh spring 905 is compressed, at this time, the first switch mechanism is opened, so that the electrode 101 can enter the plant oil in the sampling cylinder 302; S4: when the upper end of the first push rod 508 abuts against the bottom of the L-shaped plate 12, the second push rod 704 can be pushed to move downward, at the same time, the fifth spring 706 is compressed, and the second push pin 708 is driven to slide downward along the spiral groove 701, so as to push the rotating seat 303 to rotate, when the rotating seat 303 rotates, the stirring plate 306 can be driven to rotate, so as to stir the plant oil in the sampling cylinder 302, improve the ion diffusion rate, and ensure the accuracy of subsequent detection, after stirring is completed, when the second push pin 708 slides downward along the vertical groove 702, at this time, the rotating seat 303 and the stirring plate 306 no longer rotate, that is, the plant oil is no longer stirred, and the electrode 101 surface diffusion layer is stable after standing for 30 seconds to 1 minute, avoiding interference of stirring on subsequent elution signal, ensuring the accuracy of detection, during detection, the intelligent module 104 is intelligently controlled, and the electrochemical workstation 103 detects and analyzes potential change, realizing detection of pollutants; S5: when the mounting seat 102 moves downward during detection, the two second push plates 406 can be driven to move downward, so that the upper end of the first push plate 405 slides along the first inclined surface 407, thereby pushing the two first push plates 405 to move away from each other, the third spring 404 is compressed, and the mounting cover 408 is driven to move through the connecting frame 403, thereby driving the plurality of triangular blocks 411 to move, when the second inclined surface 412 abuts against the side wall of the rectangular block 401, the second inclined surface 412 can be pushed to retract into the mounting cover 408, and at the same time, the fourth spring 410 is compressed, at this time, the winding roller 202 does not rotate; S6: after detection is completed, the moving ring 301 and the sampling cylinder 302 are driven to move downward and reset by the lifting module 304, at this time, the mounting seat 102 can move upward and reset under the action of the second spring 503, and is removed from the plant oil, at the same time, when the mounting seat 102 moves upward, the second push plate 406 can move upward, when the first push plate 405 gradually separates from the first inclined surface 407, the two first push plates 405 can move close to each other and reset under the action of the third spring 404, and the mounting cover 408 is driven to move through the connecting frame 403, when the side wall of the triangular block 411 abuts against the rectangular block 401, the winding roller 202 can be pushed to rotate, at the same time, the storage roller 203 is driven to rotate, thereby driving the cleaning cloth 204 to be conveyed, so that the cleaning cloth 204 can adsorb and clean the plant oil remaining on the surface of the electrode 101, the adsorbed cleaning cloth 204 is wound on the winding roller 202, and under the action of the first spring 208, the cleaning cloth 204 can be in contact with the side wall of the electrode 101, ensuring the adsorption effect, so as to facilitate adsorption and cleaning of the plant oil remaining on the surface of the electrode 101, ensuring the use effect and service life, and ensuring the accuracy of subsequent detection; S7: Then, the electromagnet 605 is powered off, at this time, the piston 307 can be reset upward under the action of the sixth spring 603, at this time, the plant oil in the sampling cylinder 302 can be squeezed out through the oil suction pipe 308, the elastic rubber plate is arranged between the sealing plate 906 and the fixed frame 901, at the same time, the top of the piston 307 is provided with a rectangular groove, so that the fixed frame 901 and the sealing plate 906 can be attached to the bottom of the rectangular groove, so that the piston 307 can be attached to the top of the sampling cylinder 302, thereby ensuring that the plant oil in the sampling cylinder 302 can be completely discharged.

[0038] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A device for detecting pollutants in vegetable oil, comprising an electrode (101) arranged on an electrochemical sensor, a mounting base (102), an electrochemical workstation (103) and an intelligent module (104), characterized in that: The side walls of the electrochemical workstation (103) and the intelligent module (104) are fixedly connected to an L-shaped plate (12), and the bottom of the L-shaped plate (12) is connected to a lifting plate (10) via a first lifting mechanism. The lifting plate (10) is fixedly sleeved on the side wall of the mounting seat (102), and the bottom of the L-shaped plate (12) is fixedly connected to a fixing ring (13). A telescopic cover (11) is fixedly connected between the fixing ring (13) and the lifting plate (10), and the electrode (101) is inserted into the bottom of the L-shaped plate (12). An adsorption mechanism for adsorbing and cleaning the vegetable oil remaining on the surface of the electrode (101) is provided in the fixing ring (13). A sampling mechanism for quantitatively sampling the vegetable oil is provided below the L-shaped plate (12), so that the sampling mechanism can stir the vegetable oil and discharge bubbles.

2. The device for detecting pollutants in vegetable oil according to claim 1, characterized in that: The adsorption mechanism comprises two groups of symmetrically arranged fixed blocks (205) fixedly connected to the top of the L-shaped plate (12), the number of the fixed blocks (205) in each group is two, and the side wall of each fixed block (205) is fixedly connected to two first rods (206), the side wall of the first rod (206) is sleeved with a first sleeve (207), and the other end of the first sleeve (207) is fixedly connected to a connecting block (209), the side wall of each first sleeve (207) is sleeved with a first spring (208), and the top of the connecting block (209) is fixedly connected to a mounting plate (201), the side wall of the mounting plate (201) is rotatably connected to a storage roller (203) and a winding roller (202), and a cleaning cloth (204) is wound around the storage roller (203), the other end of the cleaning cloth (204) is fixed to the side wall of the winding roller (202), and the rotation of each winding roller (202) is driven by a first driving mechanism.

3. The device for detecting pollutants in vegetable oil according to claim 2, characterized in that: The bottom of the L-shaped plate (12) is fixedly connected to a plurality of legs (14), the sampling mechanism comprises a moving ring (301), and the moving ring (301) is connected to the bottom of the L-shaped plate (12) via a lifting module (304), a sampling cylinder (302) is fixedly inserted in the moving ring (301), and the bottom of the sampling cylinder (302) is rotatably connected to a rotating seat (303), the rotation of the rotating seat (303) is driven by a second driving mechanism, and the top of the rotating seat (303) is fixedly connected to a plurality of stirring plates (306 ), a piston (307) is sleeved on the side wall of the stirring plate (306), and a second lifting mechanism is provided between the piston (307) and the rotating seat (303), so that the piston (307) can be lifted and slid along the inner wall of the sampling cylinder (302), a strip opening (305) is provided on the top of the sampling cylinder (302), and a first switch mechanism is provided at the bottom of the strip opening (305), and an oil extraction pipe (308) is fixedly connected to the side wall of the sampling cylinder (302), and a second switch mechanism is provided on the side wall of the oil extraction pipe (308).

4. The device for detecting pollutants in vegetable oil according to claim 3, characterized in that: The first lifting mechanism includes two symmetrically arranged first T-shaped guide rods (502) fixedly connected to the bottom of the L-shaped plate (12), and the side walls of the first T-shaped guide rods (502) are sleeved with sliders (501), the sliders (501) are fixed to the side walls of the lifting plate (10), and the side walls of each first T-shaped guide rod (502) are sleeved with second springs (503), the side walls of the L-shaped plate (12) are rotatably connected to the rotating plate (504) through the rotating shaft (505), and the side walls of the rotating plate (504) are provided with a first sliding groove (506), a first pushing pin (507) is inserted into the first sliding groove (506), and the first pushing pin (507) is fixed to the side wall of the mounting seat (102), the top of the moving ring (301) is fixedly connected to the first pushing rod (508), and the first pushing rod (508) is arranged to pass through the bottom of the L-shaped plate (12).

5. The device for detecting pollutants in vegetable oil according to claim 2, characterized in that: The first driving mechanism comprises a plurality of rectangular blocks (401) fixedly connected to the side wall of the winding roller (202), and two symmetrically arranged moving rods (402) are inserted into the side wall of the fixed ring (13), one end of the moving rod (402) is fixedly connected to a first pushing plate (405), and the side wall of the mounting seat (102) is fixedly connected to an L-shaped second pushing plate (406), the side wall of the second pushing plate (406) is provided with a first inclined surface (407), so that the first pushing plate (405) can slide on the first inclined surface (407), and the moving plate (405) is fixedly connected to the side wall of the mounting seat (102). The side wall sleeve of the movable rod (402) is provided with a third spring (404), and the side wall fixed sleeve of the movable rod (402) is provided with a connecting frame (403), the top of the connecting frame (403) is fixedly connected to a mounting cover (408), and a sliding plate (409) is slidably connected inside the mounting cover (408), the sliding plate (409) and the bottom of the mounting cover (408) are fixedly connected to a fourth spring (410), the top of the sliding plate (409) is fixedly connected to a plurality of triangular blocks (411), and the side walls of the triangular blocks (411) are provided with second inclined surfaces (412).

6. The device for detecting pollutants in vegetable oil according to claim 3, characterized in that: The second driving mechanism includes a second slide groove provided on the side wall of the rotating seat (303), and the second slide groove includes a spiral groove (701) and a vertical groove (702) connected end to end. The side wall of the sampling tube (302) is fixedly connected to a fixed plate (703), and a second push rod (704) is inserted into the top of the fixed plate (703). The lower end of the second push rod (704) is fixedly connected to a second push pin (708), and the second push pin (708) is inserted into the slide groove. The side wall of the second push rod (704) is fixedly sleeved with a retaining ring (705), and the side wall of the second push rod (704) is sleeved with a fifth spring (706). The side wall of the fifth spring (706) is sleeved with a first protective cover (707), and the two ends of the first protective cover (707) are respectively fixed to the retaining ring (705) and the fixed plate (703).

7. The device for detecting pollutants in vegetable oil according to claim 3, characterized in that: The second lifting mechanism includes a second sleeve (601) fixedly connected to the bottom of the piston (307), and a second sleeve rod (602) is inserted into the second sleeve (601), the lower end of the second sleeve rod (602) is fixed to the top of the rotating seat (303), and a sixth spring (603) is sleeved on the side wall of the second sleeve (601), the bottom of the piston (307) is fixedly connected to an annular iron block (604), and the top of the rotating seat (303) is fixedly connected to an annular electromagnet (605).

8. The device for detecting pollutants in vegetable oil according to claim 3, characterized in that: The first switch mechanism comprises a fixed frame (901) fixedly connected to the bottom of the strip-shaped opening (305), and two third sleeves (903) are fixedly connected to the side walls of the fixed frame (901), a third set of rods (904) are inserted into the third sleeves (903), and the ends of the third set of rods (904) are fixedly connected to a sealing plate (906), the side walls of each of the third sleeves (903) are sleeved with a seventh spring (905), and the top of the sealing plate (906) is provided with a third inclined surface (902).

9. The device for detecting pollutants in vegetable oil according to claim 3, characterized in that: The second switch mechanism includes a fixed cover (801) fixedly inserted into the side wall of the oil extraction pipe (308), and a sealing block (802) is slidably connected in the fixed cover (801), a through hole (803) is opened on the top of the sealing block (802), and the side wall of the sealing block (802) is fixedly connected to two symmetrically arranged first support blocks (804), the side wall of the first support block (804) is fixedly connected to two symmetrically arranged second T-shaped guide rods (805), and the side wall of the second T-shaped guide rod (805) is sleeved with a second support block (806), the second support block (806) is fixed to the side wall of the fixed cover (801), and the side wall of each second T-shaped guide rod (805) is sleeved with an eighth spring (807), and the side wall of the eighth spring (807) is sleeved with a second The protective cover (808) is fixed to the first support block (804) and the second support block (806) at both ends. The side wall of the sampling cylinder (302) is provided with a push block (809), and the push block (809) is fixed to the side wall of the sealing block (802). The bottom of the piston (307) is fixedly connected to the first vertical plate (814), and the lower end of the first vertical plate (814) is fixedly connected to the first inclined plate (813). The lower end of the first inclined plate (813) is fixedly connected to the second vertical plate (810), and the lower end of the second vertical plate (810) is fixedly connected to the second inclined plate (811). The lower end of the second inclined plate (811) is fixedly connected to the third vertical plate (812), and an avoidance groove (815) is provided on the top of the rotating seat (303).

10. A method for detecting pollutants in vegetable oils, using the device for detecting pollutants in vegetable oils according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: When it is necessary to test the vegetable oil, the L-shaped plate (12) is supported by the supporting legs (14), and at the same time, the sampling tube (302) is positioned above the vegetable oil. Then, the lifting module (304) drives the movable ring (301) and the sampling tube (302) to move downward, and the sampling tube (302) is lowered into the vegetable oil, so that the sampling depth can be adjusted according to the needs. After the sampling depth is reached, the electromagnet (605) is energized. When the electromagnet (605) is energized, it attracts the iron block (604), causing the piston (307) to move downward. At the same time, the sixth spring (603) is gradually compressed, so that a negative pressure is generated in the sampling tube (302); S2: When the piston (307) moves downward, when the push block (809) slides along the third vertical plate (812) and the second inclined plate (811) to the side wall of the second vertical plate (810), the sealing block (802) can move in the direction away from the fixed cover (801) under the action of the eighth spring (807), so that the through hole (803) coincides with the oil extraction pipe (308). At this time, the second switch mechanism is opened, and the vegetable oil at this depth can be extracted through the oil extraction pipe (308). When the pushing block (809) slides along the first inclined plate (813) to the side wall of the first vertical plate (814), the sealing block (802) can be pushed to slide into the fixed cover (801), so that the through hole (803) and the oil extraction pipe (308) are offset. At the same time, the eighth spring (807) is compressed. At this time, the second switch mechanism is closed. When the piston (307) continues to move downward, negative pressure can be generated above the vegetable oil in the sampling cylinder (302); S3: After the sampling is completed, the lifting module (304) drives the moving ring (301) and the sampling tube (302) to move upward, and at the same time, drives the first push rod (508) to move upward. When the upper end of the first push rod (508) abuts against the bottom of the rotating plate (504), it can push the rotating plate (504) to rotate clockwise along the rotating shaft (505), so that the first push pin (507) slides along the first slide groove (506), and drives the mounting seat (102) and the electrode (101 ) moves downward, the second spring (503) is compressed, so that the electrode (101) is inserted into the strip-shaped opening (305), and the inner wall of the strip-shaped opening (305) is provided with a sealing ring to ensure sealing. When the bottom of the mounting seat (102) abuts against the top of the third inclined surface (902), the sealing plate (906) can be pushed to move. At the same time, the seventh spring (905) is compressed. At this time, the first switch mechanism is opened, so that the electrode (101) can enter the vegetable oil in the sampling cylinder (302); S4: When the upper end of the first push rod (508) abuts against the bottom of the L-shaped plate (12), the second push rod (704) can be pushed to move downward. At the same time, the fifth spring (706) is compressed and drives the second push pin (708) to slide downward along the spiral groove (701), thereby driving the rotating seat (303) to rotate. When the rotating seat (303) rotates, the stirring plate (306) can be driven to rotate, thereby stirring the vegetable oil in the sampling tube (302), improving the ion diffusion rate, and ensuring the accuracy of subsequent detection. After the stirring is completed, when the second push pin (708) slides downward along the vertical groove (702), the rotating seat (303) and the stirring plate (306) no longer rotate. S5: During the inspection, when the mounting seat (102) moves downward, it can drive the two second push plates (406) to move downward, so that the upper end of the first push plate (405) slides along the first inclined surface (407), thereby pushing the two first push plates (405) to move away from each other, and the third spring (404) is compressed, and drives the mounting cover (408) to move through the connecting frame (403), thereby driving the multiple triangular blocks (411) to move, and when the second inclined surface (412) abuts against the side wall of the rectangular block (401), it can push the second inclined surface (412) to retract into the mounting cover (408), and at the same time, the fourth spring (410) is compressed, and at this time, the winding roller (202) does not rotate; S6: After the detection is completed, the lifting module (304) drives the moving ring (301) and the sampling tube (302) to move downward and reset. At this time, the mounting seat (102) can move upward and reset under the action of the second spring (503) and move out of the vegetable oil. At the same time, when the mounting seat (102) moves upward, it can drive the second push plate (406) to move upward. When the first push plate (405) gradually separates from the first inclined surface (407), the two first push plates (405) can move closer to each other and reset under the action of the third spring (404), and through The connecting frame (403) drives the mounting cover (408) to move. When the side wall of the triangular block (411) abuts against the rectangular block (401), the storage roller (203) and the winding roller (202) are driven to rotate, thereby driving the cleaning cloth (204) to be transported, so that the cleaning cloth (204) can absorb and clean the vegetable oil remaining on the surface of the electrode (101). The cleaning cloth (204) after absorption is wound on the winding roller (202), and under the action of the first spring (208), the cleaning cloth (204) can be brought into contact with the side wall of the electrode (101); S7: Next, the electromagnet (605) is powered off. At this time, the piston (307) can move upward and reset under the action of the sixth spring (603). At this time, the vegetable oil in the sampling cylinder (302) can be squeezed out through the oil extraction pipe (308).

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