Fruit and vegetable pesticide residue detection and rapid purification device

Abstract

The invention discloses a fruit and vegetable pesticide residue detection and rapid purification device, relates to the field of chromatography detection, and solves the problems that an existing fruit and vegetable pesticide residue detection and rapid purification device is large in number of devices, tedious in operation process and low in detection efficiency when used, the fruit and vegetable pesticide residue detection and rapid purification device comprises a machine body, a chromatographic column, a filling mechanism, a feeding mechanism, a switching mechanism and a plurality of test tubes, according to the fruit and vegetable pesticide residue detection and rapid purification device, cotton is conveniently clamped and conveyed to the bottom of the inner wall of the chromatographic column through the filling mechanism, and quartz sand is uniformly input to the upper side of the cotton in a linkage manner after the cotton is completely stuffed; liquid is uniformly conveyed along the inner wall of a chromatographic column through the feeding mechanism, test tubes are butted and fixed through the switching mechanism, the weight of reagents in the test tubes is sensed, when the reagents reach the half of the volume of the test tubes, the positions of the test tubes are automatically switched, leakage is prevented, and the device is comprehensive in function and capable of effectively reducing the experiment difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of chromatographic detection, and specifically to a rapid purification device for detecting pesticide residues in fruits and vegetables. Background Technique

[0002] When purifying the detection of pesticide residues in fruits and vegetables, gel chromatography purification is often used. Chromatography is an analytical technique for separating the components of a mixture. The chromatographic column is part of the instrument used in chromatography and is also called a chromatography column. Usually, a glass column is used as a carrier and is generally fixed vertically. The stationary phase is a solid powder with an adsorption effect, and the most commonly used are silica gel or aluminum chloride. The mobile phase, also called the eluent, enters from the top of the column and flows by its own gravity or an external pressure. The sample of column chromatography is loaded on the top of the column. Column chromatography is a chromatographic method with a fixed length of the stationary phase, and the separation is achieved by collecting the eluent at different times respectively.

[0003] When currently detecting and purifying pesticide residues in fruits and vegetables by chromatography, generally, cotton needs to be stuffed at the bottom of the chromatographic column first, then a layer of quartz sand is laid, and then silica slurry is poured in. The solvent is discharged so that the solvent level is slightly higher than the silica. Then, a layer of quartz sand is added on the upper layer. The sample solution is added along the column wall, and the sample is pressurized and eluted into a test tube. A new test tube needs to be replaced every half tube is filled. Finally, the components of the substances in each test tube are analyzed by chromatography. However, the existing devices are relatively scattered, the operation steps are cumbersome, and errors are likely to occur during operation, affecting the accuracy of the experimental results. For this reason, we propose a rapid purification device for detecting pesticide residues in fruits and vegetables. Summary of the Invention

[0004] The purpose of the present invention is to provide a rapid purification device for detecting pesticide residues in fruits and vegetables that is convenient for reducing the experimental difficulty, improving the experimental efficiency and accuracy, so as to solve the problems proposed in the above background technique.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rapid purification device for detecting pesticide residues in fruits and vegetables, comprising a body, a chromatographic column, a filling mechanism, a feeding mechanism, a switching mechanism and a plurality of test tubes, the body being provided with a clamping member for clamping and fixing the chromatographic column, the filling mechanism comprising a lifting tube installed on the body, the bottom of the lifting tube being provided with a conveying member for clamping and conveying cotton, a loading box for loading quartz sand being fixedly connected to the outer wall of the bottom end of the lifting tube, the body being provided with an inflating member for inflating the chromatographic column through the lifting tube after the filling is completed to improve the liquid separation efficiency, the filling mechanism being used to clamp and convey the cotton to the bottom of the inner wall of the chromatographic column through the conveying member, and after the cotton is completely stuffed in, the quartz sand in the loading box is evenly input to the upper side of the cotton in a linked manner, and the inflating member is used to inflate the chromatographic column through the inflating member The column is pressurized to improve the separation efficiency. The feeding mechanism includes a feeding tube installed on the body, the lifting tube is slidably connected to the inner wall of the feeding tube in the vertical direction, and a plurality of side holes are evenly arranged on the side of the bottom end of the feeding tube. The feeding mechanism is used to input liquid raw materials and samples into the side hole positions through the feeding tube, and evenly transport the liquid along the inner wall of the chromatographic column through the side holes. The switching mechanism includes a rotating disk installed on the body, and a plurality of groups of mutually connected collecting buckets are provided on the upper side of the rotating disk. The switching mechanism is used to dock the test tube and the collecting bucket through the rotating disk, and sense the weight of the reagent inside the test tube. When the reagent reaches half of the test tube capacity, the position of the test tube is automatically switched, and the reagent is prevented from leaking during the switching process, thereby reducing the difficulty of the experiment and improving the efficiency and accuracy of the experiment.

[0006] Preferably, the conveying member includes two groups of protective shells fixedly installed on the sides of the lifting tube, and both groups of protective shells are rotatably connected with incomplete gears. The sides of the incomplete gears are fixedly connected with clamping rods. The lifting tube is provided with a driving member for driving the clamping rod to open and stuffing the cotton into the bottom of the chromatographic column when the inflator initially inflates the lifting tube, so as to facilitate clamping and conveying the cotton.

[0007] Preferably, the driving member includes a fixing ring fixedly installed inside the lifting tube, the bottom of the fixing ring is fixedly connected to a tension spring, the bottom end of the tension spring is fixedly connected to a lifting column slidably connected to the inner wall of the lifting tube along the vertical direction, and both sides of the lifting column are provided with first tooth grooves that can mesh with the incomplete gear, so as to drive the clamping rod to open and stuff cotton into the bottom of the chromatographic column when the inflatable member initially inflates the lifting tube.

[0008] Preferably, the loading mechanism further includes an annular pipe fixedly installed on the outer wall of the bottom end of the lifting pipe. A plurality of output holes are evenly formed in the bottom of the annular pipe. First pipes are formed in both the loading box and the lifting pipe. A second pipe communicating with the annular pipe is formed on the side of the lifting pipe. A bent pipe for communicating the first pipe and the second pipe is formed in the lifting column. A lifting member for controlling the lifting state of the lifting pipe is provided on the machine body, which is convenient for filling quartz sand after the cotton is completely stuffed.

[0009] Preferably, the inflation member includes an air pump fixedly installed on the machine body. The output end of the air pump is connected with a hose in a communicating manner. One end of the hose is connected with the upper side of the lifting pipe in a communicating manner. A third pipe communicating with the bottom of the lifting pipe is formed in the lifting column. The bottom end of the third pipe is in sliding fit with the inner wall of the lifting pipe, which is convenient for inflating the chromatographic column through the lifting pipe after filling to improve the liquid separation efficiency.

[0010] Preferably, the switching mechanism further includes a plurality of spring scales fixedly installed on the turntable. The upper end of the spring scale is fixedly connected with a top block slidably connected with the turntable in the vertical direction. A fixed column is fixedly connected to the upper side of the turntable. The collection hopper is fixedly connected to the top of the fixed column, which is convenient for docking the test tube and the collection hopper through the turntable and sensing the weight of the reagent inside the test tube. When the reagent reaches half of the capacity of the test tube, the position of the test tube is automatically switched, and the reagent leakage is prevented during the switching process.

[0011] Preferably, the feeding mechanism further includes a rubber plug fixedly installed on the outer wall of the feeding pipe. The top end of the feeding pipe is connected with a feeding hopper in a communicating manner. The top end of the rubber plug is rotatably connected with a knob. A first through hole is formed in the knob. A second through hole capable of communicating with the first through hole is formed in the rubber plug. The bottom of the second through hole is connected with the chromatographic column, which is convenient for inputting liquid raw materials and samples into the side hole position through the feeding pipe and uniformly conveying the liquid along the inner wall of the chromatographic column through the side hole.

[0012] Preferably, the lifting member includes a driving motor fixedly installed on the machine body. The output end of the driving motor is coaxially and fixedly connected with a driving gear. Second tooth grooves capable of meshing with the driving gear are evenly formed on the outer wall of the lifting pipe, which is convenient for controlling the lifting state of the lifting pipe.

[0013] Preferably, a threaded cover is threadedly connected to the upper end of the loading box. The threaded cover is movably sleeved on the outer wall of the lifting pipe, which is convenient for filling and storing quartz sand.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The invention solves the problems that the existing rapid purification device for detecting pesticide residues in fruits and vegetables has many equipments, complicated operation process and low detection efficiency. By arranging a filling mechanism, a feeding mechanism and a switching mechanism, the filling mechanism clamps and conveys the cotton to the bottom of the inner wall of the chromatographic column through a conveying member, and after the cotton is completely stuffed, the quartz sand in the loading box is evenly input to the upper side of the cotton, and the chromatographic column is pressurized through the inflatable member to improve the separation efficiency, the liquid raw material and the sample are input to the side hole position through the feeding pipe through the feeding mechanism, and the liquid is evenly conveyed along the inner wall of the chromatographic column through the side hole, the switching mechanism docks the test tube and the collecting bucket through a rotating disk, and senses the weight of the reagent inside the test tube, and automatically switches the position of the test tube when the reagent reaches half of the test tube capacity to prevent the reagent from leaking during the switching process. The device has comprehensive functions, can effectively reduce the difficulty of the experiment, and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the chromatographic column of the present invention when it is not installed; Figure 3 It is a schematic diagram of the structure of the switching mechanism of the present invention; Figure 4 for Figure 3 A magnified image of the middle A area; Figure 5 for Figure 3 Enlarged view of area B; Figure 6 It is a schematic diagram of the structure of the filling mechanism of the present invention; Figure 7 for Figure 6 Enlarged view of area C in the middle; Figure 8 for Figure 6 Enlarged view of area D in the middle; Figure 9 It is a schematic diagram of the structure of the feeding mechanism of the present invention; Figure 10 for Figure 9 Enlarged view of the middle E area; Figure 11 It is a schematic diagram of the local structure of the driving member of the present invention; Figure 12 It is a partial structural cross-sectional view of the loading mechanism of the present invention.

[0016] In the figure: 1 - body; 2 - chromatographic column; 3 - test tube; 4 - clamping member; 5 - loading mechanism; 6 - lifting tube; 7 - conveying member; 8 - loading box; 9 - inflating member; 10 - feeding mechanism; 11 - feeding tube; 12 - side hole; 13 - switching mechanism; 14 - rotating disk; 15 - collecting hopper; 16 - protective shell; 17 - incomplete gear; 18 - clamping rod; 19 - driving member; 20 - fixing ring; 21 - tension spring; 22 - lifting column; 23 - first tooth groove; 24 - annular tube; 25 - output hole; 26 - first pipeline; 27 - second pipeline; 28 - elbow pipe; 29 - lifting member; 30 - inflating pump; 31 - hose; 32 - third pipeline; 33 - spring scale; 34 - top block; 35 - fixing column; 36 - rubber plug; 37 - feeding hopper; 38 - knob; 39 - first through hole; 40 - second through hole; 41 - driving motor; 42 - driving gear; 43 - second tooth groove; 44 - threaded cap. Detailed implementation manners

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0018] Please refer to Figures 1 - 10The device for rapid purification of pesticide residues in fruits and vegetables shown in the figure comprises a body 1, a chromatographic column 2, a filling mechanism 5, a feeding mechanism 10, a switching mechanism 13 and multiple test tubes 3. The body 1 is provided with a clamping member 4 for clamping and fixing the chromatographic column 2. The filling mechanism 5 comprises a lifting tube 6 installed on the body 1. The bottom of the lifting tube 6 is provided with a conveying member 7 for clamping and conveying cotton. The outer wall of the bottom end of the lifting tube 6 is fixedly connected with a loading box 8 for loading quartz sand. The body 1 is provided with an inflating member 9 for inflating the chromatographic column 2 through the lifting tube 6 after the filling is completed to improve the liquid separation efficiency. The filling mechanism 5 is used to clamp and convey the cotton to the bottom of the inner wall of the chromatographic column 2 through the conveying member 7, and after the cotton is completely stuffed, the quartz sand in the loading box 8 is evenly input to the upper side of the cotton, and the inflating member 9 is used to inflate the chromatographic column 2 through the lifting tube 6. The chromatographic column 2 is pressurized to improve the separation efficiency. The feeding mechanism 10 includes a feeding pipe 11 installed on the body 1. The lifting pipe 6 is slidably connected to the inner wall of the feeding pipe 11 in the vertical direction. A plurality of side holes 12 are evenly arranged on the side of the bottom end of the feeding pipe 11. The feeding mechanism 10 is used to input liquid raw materials and samples into the side holes 12 through the feeding pipe 11, and evenly transport the liquid along the inner wall of the chromatographic column 2 through the side holes 12. The switching mechanism 13 includes a rotating disk 14 installed on the body 1. A plurality of mutually connected collecting buckets 15 are arranged on the upper side of the rotating disk 14. The switching mechanism 13 is used to dock the test tube 3 and the collecting bucket 15 through the rotating disk 14, and sense the weight of the reagent inside the test tube 3. When the reagent reaches half of the capacity of the test tube 3, the position of the test tube 3 is automatically switched, and the reagent is prevented from leaking during the switching process.

[0019] See also Figures 6 - 12 The conveying member 7 shown in the figure includes two sets of protective shells 16 fixedly installed on the side of the lifting tube 6, and both sets of protective shells 16 are rotatably connected with incomplete gears 17. The side of the incomplete gear 17 is fixedly connected with a clamping rod 18. The lifting tube 6 is provided with a driving member 19 for driving the clamping rod 18 to open and stuff the cotton into the bottom of the chromatographic column 2 when the inflating member 9 initially inflates the lifting tube 6.

[0020] See also Figures 9 - 12 The driving member 19 shown in the figure includes a fixing ring 20 fixedly installed inside the lifting tube 6, a tension spring 21 is fixedly connected to the bottom of the fixing ring 20, and a lifting column 22 is fixedly connected to the inner wall of the lifting tube 6 in a vertical sliding direction at the bottom end of the tension spring 21, and first tooth grooves 23 that can mesh with the incomplete gear 17 are provided on both sides of the lifting column 22.

[0021] See also Figures 2 - 11, in the illustrated inflatable member 9, an air pump 30 fixedly installed on the body 1 is included. The output end of the air pump 30 is connected in communication with a hose 31. One end of the hose 31 is connected in communication with the upper side of the side wall of the lifting tube 6. A third pipe 32 communicating with the bottom of the lifting tube 6 is provided in the lifting column 22. The bottom end of the third pipe 32 is in sliding fit with the inner wall of the lifting tube 6.

[0022] In this embodiment, the chromatographic column 2 is fixed to the body 1 through the clamping member 4 to keep the whole chromatographic column 2 in a vertical state. A small mass of cotton is placed between the clamping rods 18 for clamping. An appropriate amount of quartz sand is loaded into the loading box 8. The lifting tube 6 is inserted into the chromatographic column 2. The air pump 30 is started, and the lifting tube 6 is inflated through the hose 31, so that the air pressure in the lifting tube 6 increases, pushing the lifting column 22 to move downward. The tension spring 21 is gradually stretched, and the first tooth groove 23 gradually drives the incomplete gears 17 on both sides to rotate, opening the clamping rods 18 to both sides, so as to place the cotton at the bottom of the chromatographic column 2. At the same time, as the lifting column 22 moves downward, the cotton is abutted and tightened, and after the cotton is completely inserted, the quartz sand in the loading box 8 is uniformly input above the cotton in a linkage manner. The liquid raw material and the sample are input to the side hole 12 position through the feeding mechanism 10 through the feeding pipe 11, and the liquid is uniformly conveyed along the inner wall of the chromatographic column 2 through the side hole 12. The switching mechanism 13 docks the test tube 3 and the collection hopper 15 through the rotating disk 14, and senses the weight of the reagent inside the test tube 3. When the reagent reaches half of the capacity of the test tube 3, the position of the test tube 3 is automatically switched to prevent the reagent from spilling during the switching process. This device has comprehensive functions, can effectively reduce the experimental difficulty and is convenient to use.

[0023] It should be noted that when it is necessary to pressurize the liquid in the chromatographic column 2, the lifting tube 6 is controlled to move up to a position above the liquid level, and the air pump 30 continues to inflate, which can push the lifting column 22 to continue to move downward until the bottom end of the third pipe 32 slides out of the lifting tube 6, so that the gas in the lifting tube 6 can be discharged into the chromatographic column 2 through the third pipe 32, increasing the air pressure in the chromatographic column 2 and pushing the liquid at the bottom to flow downward at an accelerated speed. Embodiment 2

[0024] Please refer to Figures 1 - 12 Referring to Embodiment 2, this embodiment further describes Embodiment 1. The filling mechanism 5 in the illustration further includes an annular tube 24 fixedly installed on the outer wall of the bottom end of the lifting tube 6. A plurality of groups of output holes 25 are uniformly provided at the bottom of the annular tube 24. First pipes 26 are provided on both the loading box 8 and the lifting tube 6. A second pipe 27 communicating with the annular tube 24 is provided on the side of the lifting tube 6. A bent pipe 28 for communicating the first pipe 26 and the second pipe 27 is provided in the lifting column 22. A lifting member 29 for controlling the lifting state of the lifting tube 6 is provided on the body 1.

[0025] Please refer toFigures 2 - 12 , in the illustrated lifting member 29, a driving motor 41 fixedly installed on the machine body 1 is included. The model of the driving motor 41 is preferably an LD60 micro motor. The output end of the driving motor 41 is coaxially and fixedly connected with a driving gear 42. Second tooth grooves 43 capable of meshing with the driving gear 42 are uniformly formed on the outer wall of the lifting pipe 6. A threaded cover 44 is threadedly connected to the upper end of the loading box 8, and the threaded cover 44 is movably sleeved on the outer wall of the lifting pipe 6.

[0026] In this embodiment, when the lifting column 22 moves downward, the elbow pipe 28 will gradually move downward. After the lifting column 22 stuffs the cotton, at this time, the two ends of the elbow pipe 28 just connect the first pipe 26 and the second pipe 27. The quartz sand in the loading box 8 can enter the annular pipe 24 through the first pipe 26, the elbow pipe 28, and the second pipe 27, and then be evenly output to the upper side of the cotton at the bottom of the chromatographic column 2 through the output holes 25 at the bottom. At this time, the air inflation pump 30 no longer continues to pressurize to prevent the lifting column 22 from continuing to move downward. At this time, the third pipe 32 is still inside the lifting pipe 6 and will not exhaust to the outside. Starting the driving motor 41 can drive the driving gear 42 to rotate, thereby controlling the lifting pipe 6 to move up and down through the second tooth grooves 43. Opening the threaded cover 44 can load the quartz sand into the loading box 8. When adding quartz sand in the middle of the experiment, the same device can also be used for filling. Example 3

[0027] Please refer to Figures 1 - 5 Regarding Example 3, this example further explains Example 1. In the illustrated switching mechanism 13, it further includes a plurality of spring scales 33 fixedly installed on the rotating disk 14. The upper end of the spring scale 33 is fixedly connected with a top block 34 that is slidably connected to the rotating disk 14 in the vertical direction. A fixed column 35 is fixedly connected to the upper side of the rotating disk 14. The collection hopper 15 is fixedly connected to the top of the fixed column 35.

[0028] Please refer to Figures 2 - 8 , in the illustrated feeding mechanism 10, it further includes a rubber plug 36 fixedly installed on the outer wall of the feeding pipe 11. The top end of the feeding pipe 11 is connected and communicated with a feeding hopper 37. The top end of the rubber plug 36 is rotatably connected with a knob 38. A first through hole 39 is formed on the knob 38. A second through hole 40 capable of being communicated with the first through hole 39 is formed on the rubber plug 36. The bottom of the second through hole 40 is communicated with the chromatographic column 2.

[0029] In this embodiment, the test tube 3 is placed between the top block 34 and the collection hopper 15. The liquid flowing out of the chromatography column 2 can be completely collected by the collection hopper 15 and then flow into the test tube 3 at the bottom. The test tube 3 is completely supported above the top block 34. The spring scale 33 at this position measures the weight of the liquid in the test tube 3. When the weight reaches the set value, the turntable 14 is driven to rotate to switch the position of the test tube 3. During the switching process, since the liquid will continuously flow out from the bottom of the chromatography column 2, the liquid will be continuously collected by the collection hopper 15. The adjacent collection hoppers 15 are interconnected, effectively avoiding the situation of reagent leakage during the replacement of the test tube 3.

[0030] It should be noted that during installation, first raise the lifting tube 6 to the topmost position. After fixing the chromatography column 2, slide down the rubber stopper 36 to cover the top of the chromatography column 2. Rotate the knob 38 to connect the first through hole 39 with the second through hole 40. At this time, the cotton can be inserted and the state of the quartz sand can be adjusted. The liquid is loaded into the feed pipe 11 through the feed hopper 37. The liquid flows downward and flows out through the side holes 12 around and then flows downward into the interior of the chromatography column 2 to avoid impacting the sample layer at the top of the column. When pressure needs to be applied, rotate the knob 38 to disconnect the first through hole 39 from the second through hole 40, so as to keep the interior of the chromatography column 2 relatively airtight. At this time, the air pump 30 continuously inflates to input gas into the chromatography column 2 for pressurization.

[0031] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid purification device for detecting pesticide residues in fruits and vegetables, characterized in that, Including: A machine body (1), a chromatographic column (2) and multiple test tubes (3), and a clamping member (4) for clamping and fixing the chromatographic column (2) is provided on the machine body (1); Also including: A loading mechanism (5), the loading mechanism (5) includes a lifting tube (6) installed on the machine body (1), a conveying member (7) for clamping and conveying cotton is provided at the bottom of the lifting tube (6), a loading box (8) for loading quartz sand is fixedly connected to the outer wall of the bottom end of the lifting tube (6), an inflation member (9) for inflating the chromatographic column (2) through the lifting tube (6) after loading to improve the liquid separation efficiency is provided on the machine body (1), and the loading mechanism (5) is used to clamp and convey cotton to the bottom of the inner wall of the chromatographic column (2) through the conveying member (7), and after the cotton is completely stuffed, the quartz sand in the loading box (8) is uniformly input to the upper side of the cotton in a linkage manner, and the chromatographic column (2) is pressurized through the inflation member (9) to improve the separation efficiency; A feeding mechanism (10), the feeding mechanism (10) includes a feeding tube (11) installed on the machine body (1), the lifting tube (6) is slidably connected to the inner wall of the feeding tube (11) in the vertical direction, multiple groups of side holes (12) are uniformly opened on the side surface of the bottom end of the feeding tube (11), and the feeding mechanism (10) is used to input liquid raw materials and samples into the position of the side holes (12) through the feeding tube (11), and uniformly convey the liquid along the inner wall of the chromatographic column (2) through the side holes (12); A switching mechanism (13), the switching mechanism (13) includes a rotating disk (14) installed on the machine body (1), multiple groups of connected collecting hoppers (15) are provided on the upper side of the rotating disk (14), and the switching mechanism (13) is used to dock the test tube (3) and the collecting hopper (15) through the rotating disk (14), sense the weight of the reagent inside the test tube (3), and automatically switch the position of the test tube (3) when the reagent reaches half of the capacity of the test tube (3), and prevent the reagent from leaking during the switching process.

2. The rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 1, wherein: The conveying member (7) includes two groups of protective shells (16) fixedly installed on the side surface of the lifting tube (6), an incomplete gear (17) is rotatably connected inside each of the two groups of protective shells (16), a clamping rod (18) is fixedly connected to the side surface of the incomplete gear (17), and a driving member (19) for driving the clamping rod (18) to open at the initial stage of inflating the lifting tube (6) by the inflation member (9) and stuffing the cotton into the bottom of the chromatographic column (2) is provided inside the lifting tube (6).

3. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 2, characterized in that: The driving member (19) includes a fixed ring (20) fixedly installed inside the lifting tube (6). A tension spring (21) is fixedly connected to the bottom of the fixed ring (20). The bottom end of the tension spring (21) is fixedly connected to a lifting column (22) that is slidably connected to the inner wall of the lifting tube (6) in the vertical direction. First tooth grooves (23) capable of meshing with the incomplete gear (17) are formed on both sides of the lifting column (22).

4. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 3, characterized in that: The loading mechanism (5) further includes an annular tube (24) fixedly installed on the outer wall of the bottom end of the lifting tube (6). A plurality of groups of output holes (25) are evenly formed at the bottom of the annular tube (24). First pipes (26) are formed on both the loading box (8) and the lifting tube (6). A second pipe (27) communicating with the annular tube (24) is formed on the side of the lifting tube (6). An elbow pipe (28) for communicating the first pipe (26) and the second pipe (27) is formed inside the lifting column (22). A lifting member (29) for controlling the lifting state of the lifting tube (6) is provided on the machine body (1).

5. The rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 3, characterized in that: The inflating member (9) includes an air pump (30) fixedly installed on the machine body (1). The output end of the air pump (30) is connected in communication with a hose (31). One end of the hose (31) is connected in communication with the upper side of the lifting tube (6). A third pipe (32) communicating with the bottom of the lifting tube (6) is formed inside the lifting column (22). The bottom end of the third pipe (32) is in sliding fit with the inner wall of the lifting tube (6).

6. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 1, characterized in that: The switching mechanism (13) further includes a plurality of spring scales (33) fixedly installed on the rotating disk (14). The upper end of the spring scale (33) is fixedly connected to a top block (34) that is slidably connected to the rotating disk (14) in the vertical direction. A fixed column (35) is fixedly connected to the upper side of the rotating disk (14). The collecting hopper (15) is fixedly connected to the top of the fixed column (35).

7. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 1, characterized in that: The feeding mechanism (10) further includes a rubber plug (36) fixedly installed on the outer wall of the feeding tube (11). The top end of the feeding tube (11) is connected in communication with a feeding hopper (37). The top end of the rubber plug (36) is rotatably connected to a knob (38). A first through hole (39) is formed on the knob (38). A second through hole (40) capable of communicating with the first through hole (39) is formed on the rubber plug (36). The bottom of the second through hole (40) is connected in communication with the chromatographic column (2).

8. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 4, characterized in that: The lifting member (29) includes a driving motor (41) fixedly installed on the machine body (1). The output end of the driving motor (41) is coaxially and fixedly connected to a driving gear (42). Second tooth grooves (43) capable of meshing with the driving gear (42) are evenly formed on the outer wall of the lifting tube (6).

9. A rapid purification device for detecting pesticide residues in fruits and vegetables according to claim 1, characterized in that: A threaded cover (44) is threadedly connected to the upper end of the loading box (8). The threaded cover (44) is movably sleeved on the outer wall of the lifting tube (6).

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