Solid-phase extraction device for pesticide residue detection

Abstract

The utility model belongs to the technical field of solid-phase extraction devices, and particularly relates to a pesticide residue detection solid-phase extraction device which comprises a base, a collecting bottle, a folding supporting structure, a horizontal supporting structure, a solid-phase extraction column, a liquid outlet tank and a plurality of groups of clamping structures. At the moment, the sucking pump is closed, then the rubber sleeve is rotated clockwise, the rotating shaft is driven by the rubber sleeve to rotate in the same direction, and in the rotating process, the blocking plate can block the communicating opening between the liquid inlet pipe and the liquid inlet cylinder, so that the communicating aperture between the liquid inlet pipe and the liquid inlet cylinder is reduced, and the flow rate of liquid in the solid-phase extraction column is reduced; a shifting rod is shifted upwards to enable a limiting sliding block to slide upwards, after a limiting plate stops making contact with a lower supporting rod, a worker can rotate an upper folding rod clockwise to conduct folding at the moment, a main shaft is located above the lower supporting rod and the upper folding rod after folding, and the worker can conveniently lift the main shaft for carrying.

Description

Technical Field

[0001] The utility model belongs to the technical field of solid phase extraction devices, in particular to a solid phase extraction device for detecting pesticide residues. Background Art

[0002] Excessive pesticide residues in agricultural products or long-term intake of food containing pesticide residues may lead to the risk of chronic poisoning. In the pesticide residue detection technology, the solid phase extraction column filled with the stationary phase is placed above the collection bottle, or a negative pressure bottle is installed between the two. At the same time, the liquid outlet tank filled with the test liquid is placed on the top of the solid phase extraction column. The test liquid will flow in the direction of "liquid outlet tank → solid phase extraction column → negative pressure bottle → collection bottle" under the action of its own gravity. When the staff wants to speed up the flow rate of the liquid, a negative pressure environment can be formed by the negative pressure bottle, and the negative pressure is used to accelerate the flow rate of the liquid through the stationary phase, so that the liquid passes through the stationary phase under the dual action of liquid gravity and negative pressure, shortening the extraction time. However, the negative pressure bottle can only assist in speeding up the flow rate of the liquid. Sometimes it is affected by the particle size distribution of the stationary phase and the liquid. Due to the influence of factors such as viscosity, even if the negative pressure bottle is not opened, the liquid will still flow downward rapidly relying solely on its own gravity, resulting in the target object not being fully adsorbed by the stationary phase, thereby affecting subsequent detection. In addition, in order to improve the adsorption efficiency of the target object, the staff will connect multiple solid-phase extraction columns with fixation in series, but the series connection causes the overall height to increase, which is prone to tipping over during use. The existing bracket is usually raised and lowered by a screw to drive the clamping device on the bracket, thereby clamping the solid-phase extraction column and the liquid outlet tank, but the threaded transmission of the screw increases the overall height of the bracket and cannot be folded. In actual transportation, for example, when the bracket needs to be placed in the trunk of a vehicle for transfer, a bracket that is too high will make it difficult to place it in a limited space, and the staff needs to disassemble it before completing the transportation. Utility Model Content

[0003] (1) Technical problems solved

[0004] The utility model provides a solid phase extraction device for pesticide residue detection to solve the following problems:

[0005] 1. During the extraction process, the liquid rapidly flows downward under the action of its own gravity due to factors such as the particle size distribution of the stationary phase and the viscosity of the liquid, so that the target substance is not fully adsorbed by the stationary phase;

[0006] 2. The existing bracket adopts a screw lifting structure, which makes the overall height of the bracket too high and cannot be folded, making it difficult to put it into a limited space such as a vehicle trunk. It needs to be disassembled before transportation, which is time-consuming and labor-intensive.

[0007] (2) Technical content

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] A solid phase extraction device for detecting pesticide residues includes a base, a plurality of collection bottles are placed on the base, and a folding support structure is fixedly connected to both sides of the base. The folding support structure includes lower support rods installed on both sides of the base, the tops of the lower support rods are rotatably connected to upper folding rods, and the upper folding rods are slidably connected to a limit slider, and the inner wall of the limit slider is in contact with the lower support rods and the upper folding rods;

[0010] A horizontal support structure is installed on one side of the lower support rod, and a negative pressure bottle is clamped on the horizontal support structure. The negative pressure bottle is provided with multiple liquid inlet ends and liquid outlet ends. The liquid inlet end of the negative pressure bottle is connected to a flow rate regulating structure, and the liquid outlet end is connected to a corresponding collection bottle. The liquid inlet end of the flow rate regulating structure is connected to a solid phase extraction column, in which a stationary phase is placed, and the top of the solid phase extraction column is connected to a liquid outlet tank;

[0011] Multiple groups of clamping structures are arranged between the two upper folding rods.

[0012] Furthermore, the lower support rod and the upper folding rod are both U-shaped, a first connecting ear is symmetrically provided on one side of the top of the lower support rod, and a plurality of first connecting ears are fixedly connected to the same main shaft, and a second connecting ear is symmetrically provided on one side of the bottom of the upper folding rod, and the plurality of second connecting ears are rotatably connected to the main shaft;

[0013] A straight slot is provided on one side of the upper folding rod, and the limit slider includes a sliding shaft and two sets of limit plates. The sliding shaft is slidably connected in the straight slot, and the two sets of limit plates are fixedly connected to the two ends of the sliding shaft. The outer wall on the same side of the lower support rod and the upper folding rod is in sliding contact with one set of limit plates, and the inner wall on the same side of the lower support rod and the upper folding rod is in sliding contact with the other set of limit plates.

[0014] Furthermore, the folding support structure also includes a shift rod, which is fixedly connected between two limit plates that are in sliding contact with the outer wall of the upper folding rod.

[0015] Furthermore, the two lower support rods are fixedly connected to a same fixed plate, and the horizontal support structure includes two transverse sliding rails connected to the fixed plate, the two transverse sliding rails are symmetrically distributed on one side of the fixed plate, and the bottom of the negative pressure bottle contacts the top of the two transverse sliding rails;

[0016] A slide groove is provided at the top of the sliding track, in which two first side clamping plates are slidably connected, and a first rubber pad is fixedly connected to one end of the two first side clamping plates that are close to each other. The negative pressure bottle is located between the two first side clamping plates, and both sides of the negative pressure bottle are in contact with the corresponding first rubber pads;

[0017] The negative pressure bottle is connected to an external vacuum pump.

[0018] Furthermore, a plurality of first sockets are provided on the sliding track, the first side clamp is L-shaped, and a positioning pin is detachably inserted into the horizontal end of the first side clamp, and the positioning pin is inserted into one of the first sockets.

[0019] Furthermore, a plurality of U-shaped holders are equidistantly arranged at the adjacent ends of the two upper folding rods;

[0020] The clamping structure includes a fixing rod, two clamping seats located on the same horizontal plane are clamped with the same fixing rod, the fixing rod is detachably slidably connected to a transverse support rod, spring receiving grooves are symmetrically opened on both sides of one end of the transverse support rod, a limiting rod is fixedly connected in the spring receiving groove, a second side clamping plate is slidingly sleeved on the limiting rod, a first spring is sleeved on the limiting rod, one end of the first spring is fixedly connected to the end surface of the spring receiving groove, and the other end is fixedly connected to the second side clamping plate, the free end of the limiting rod passes through the second side clamping plate and extends outward, and the end is fixedly connected to a locking sleeve;

[0021] A second rubber pad is fixedly connected to the adjacent side of the two second side clamping plates.

[0022] Furthermore, the fixed rod is provided with a plurality of mounting grooves corresponding to the transverse support rods one by one, and the top of the transverse support rod is provided with a plurality of inner recesses, which are adapted to the mounting grooves, and a limit piece is rotatably connected in the mounting groove, and the limit piece is engaged with one of the inner recesses;

[0023] A clamping groove is provided on the limiting rod, and a clamping block which is slidably connected to the clamping groove is fixedly connected to the second side clamping plate.

[0024] Furthermore, the tops of the two upper folding rods are fixedly connected with an upper cover plate, the inner walls of the upper folding rods are slidably connected with an inverted U-shaped slide plate, a limiting groove is provided on one side of the upper folding rod close to the card seat, and the limiting groove is located between two adjacent card seats, and a plurality of connecting rods corresponding to the limiting grooves are fixedly connected on one side of the slide plate close to the card seat, the connecting rods are slidably connected to the corresponding limiting grooves, and the free ends of the connecting rods are fixedly connected with a pressing plate, and the pressing plate is located between the two adjacent card seats;

[0025] The inner wall of the upper folding rod is fixedly connected to a spring support plate, which is slidably connected to the inner wall of the slide plate. The top inner wall of the slide plate is fixedly connected to a spring limiting rod, which slides through the spring support plate and extends below it. A second spring is sleeved on the spring limiting rod, and the top of the second spring abuts against the top inner wall of the slide plate, and the bottom abuts against the spring support plate.

[0026] The upper cover plate is threadedly connected with a bolt head, and the bottom of the bolt head penetrates the upper cover plate and abuts against the top of the slide plate.

[0027] Furthermore, the flow rate regulating structure includes a liquid inlet cylinder, which is cylindrical and transparent throughout, with a liquid inlet pipe connected to the top of the liquid inlet cylinder and a liquid discharge pipe connected to the bottom. The liquid inlet cylinder is rotatably connected to a rotating shaft, one end of the rotating shaft passes through the liquid inlet cylinder, and the end is covered with a rubber sleeve. The rotating shaft body located inside the liquid inlet cylinder is fixedly covered with a blocking plate, the top of the blocking plate is in sliding contact with the inner wall of the liquid inlet cylinder, and is connected to the liquid inlet pipe;

[0028] The liquid discharge pipe is communicated with the liquid inlet end of the negative pressure bottle.

[0029] Furthermore, a hollow box is clamped on the top of the base, and a plurality of card placement slots are opened on the top of the hollow box, and the collection bottles are clamped on the card placement slots.

[0030] (3) Beneficial effects

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. In the present invention, when the staff feels that the flow rate of the liquid is too fast and wants to slow down the flow rate of the liquid, the vacuum pump is turned off at this time, and then the rubber sleeve is rotated, and the rotating shaft is driven by the rubber sleeve to rotate in the same direction. During the rotation process, the blocking plate will block the connecting port between the liquid inlet pipe and the liquid inlet cylinder, thereby reducing the connecting port diameter between the liquid inlet pipe and the liquid inlet cylinder, thereby reducing the liquid flow rate in the solid phase extraction column.

[0033] 2. In the present invention, when folding is required, the staff can push the lever upward, and the lever drives the limit slider to slide upward through the limit plate. When the limit plate stops contacting the lower support rod, the staff can rotate the upper folding rod clockwise to fold. After folding is completed, the main shaft is located above the lower support rod and the upper folding rod, so that the staff can lift it up for transportation.

[0034] 3. In the present invention, the liquid inlet cylinder is transparent throughout, so that the staff can adjust the communication diameter between the liquid inlet pipe and the liquid inlet cylinder.

[0035] 4. In the present invention, after placing the negative pressure bottle on the horizontal sliding track, the corresponding positioning pin is pulled out and the two first side clamps are pushed to make the corresponding first rubber pad fit with the negative pressure bottle, and then the positioning pin is reinserted to limit the position of the first side clamp to prevent the negative pressure bottle from shifting during use.

[0036] 5. In the present invention, when in use, the staff uses the thumb and index finger to push the two second rubber pads outward. At this time, the corresponding first spring is in a stretched state. After the solid phase extraction column is connected, the second rubber pad is released. At this time, the first spring in the stretched state will shrink and reset, thereby driving the two second rubber pads to close inward, thereby clamping the solid phase extraction column after the connection is completed.

[0037] 6. In the present invention, the fixing rod is limited and fixed by the pressing plate to prevent the fixing rod from falling off the clamping seat after the upper folding rod is folded. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the assembly of the collecting bottle, negative pressure bottle, solid phase extraction column and liquid outlet tank in the present invention;

[0039] Figure 2 This is a schematic diagram of another perspective of the utility model after the collection bottle, negative pressure bottle, solid phase extraction column and liquid outlet tank are assembled;

[0040] Figure 3 It is a schematic diagram of the lower support rod, main shaft and limit slider in the utility model;

[0041] Figure 4 This is an exploded schematic diagram of the upper folding rod and the limit slider in the utility model;

[0042] Figure 5 Schematic diagram of the sliding shaft, the limiting plate and the shifting rod in the present invention;

[0043] Figure 6 This is a schematic diagram of the upper folding rod after folding in the present invention;

[0044] Figure 7 This is a schematic diagram of another perspective after the upper folding rod is folded in the present invention;

[0045] Figure 8 It is an exploded schematic diagram of the sliding track, the first side clamping plate and the positioning pin in the present invention;

[0046] Figure 9 This is an exploded schematic diagram of the upper folding rod and the slide plate of the utility model;

[0047] Figure 10 This is an exploded schematic diagram of the fixing rod and the limiting piece in the present utility model;

[0048] Figure 11 It is a partial cutaway view of the transverse support rod in the present utility model;

[0049] Figure 12 This is an exploded schematic diagram of the limiting rod and the second side clamping plate of the utility model;

[0050] Figure 13 This is a schematic diagram of the explosion of the negative pressure bottle, liquid inlet cylinder and solid phase extraction column in the utility model;

[0051] Figure 14 It is a cutaway view of the liquid inlet cylinder in the present utility model;

[0052] Figure 15It is a front view after cutting of the liquid inlet cylinder in the present utility model.

[0053] In the figure: 1. Base; 11. Collection bottle; 12. Negative pressure bottle; 13. Solid phase extraction column; 14. Liquid outlet tank; 2. Lower support rod; 21. First connecting ear; 22. Main shaft; 23. Fixed plate; 3. Upper folding rod; 301. Straight notch; 302. Limiting groove; 31. Second connecting ear; 32. Clamping seat; 33. Spring support plate; 4. Limiting slider; 41. Sliding shaft; 42. Limiting plate; 43. Push rod; 5. Sliding track; 501. Sliding groove; 502. First socket; 51. First side clamping plate; 52. First rubber pad; 53. Positioning pin; 6. Fixed rod; 601 , spring receiving groove; 602, installation groove; 61, horizontal support rod; 6101, inner recess; 62, limiting rod; 6201, clamping groove; 63, second side splint; 6301, clamping block; 64, first spring; 65, locking sleeve; 66, second rubber pad; 67, limiting plate; 7, hollow box; 701, clamping groove; 8, upper cover; 81, slide plate; 82, connecting rod; 83, pressure plate; 84, second spring; 85, bolt head; 86, spring limiting rod; 9, liquid inlet cylinder; 91, liquid inlet pipe; 92, liquid discharge pipe; 93, rotating shaft; 94, rubber sleeve; 95, blocking plate. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] Example 1

[0056] like Figures 1-15 As shown, a solid phase extraction device for pesticide residue detection includes a base 1, on which a plurality of collection bottles 11 are placed. A folding support structure is fixedly connected to both sides of the base 1. The folding support structure includes lower support rods 2 installed on both sides of the base 1. The tops of the lower support rods 2 are rotatably connected to upper folding rods 3. The upper folding rods 3 are slidably connected to a limit slider 4. The inner wall of the limit slider 4 is in contact with the lower support rods 2 and the upper folding rods 3.

[0057] A horizontal support structure is installed on one side of the lower support rod 2, and a negative pressure bottle 12 is clamped on the horizontal support structure. The negative pressure bottle 12 has multiple liquid inlet ends and liquid outlet ends. The liquid inlet end of the negative pressure bottle 12 is connected to a flow rate regulating structure, and the liquid outlet end is connected to the corresponding collection bottle 11. The liquid inlet end of the flow rate regulating structure is connected to a solid phase extraction column 13, in which a stationary phase is placed. The top of the solid phase extraction column 13 is connected to a liquid outlet tank 14;

[0058] Multiple groups of clamping structures are arranged between the two upper folding rods 3 .

[0059] Furthermore, the lower support rod 2 and the upper folding rod 3 are both U-shaped. Figure 3 As shown, a first connecting ear 21 is symmetrically provided on one side of the top of the lower support rod 2, and a plurality of first connecting ears 21 are fixedly connected to the same main shaft 22, as shown in FIG. Figure 4 and Figure 9 As shown, a second connecting ear 31 is symmetrically provided on one side of the bottom of the upper folding rod 3, and a plurality of second connecting ears 31 are rotatably connected to the main shaft 22;

[0060] Combine Figure 2 、 Figure 4 and Figure 9 As shown, a straight slot 301 is provided on one side of the upper folding rod 3, and the limiting slider 4 includes a sliding shaft 41 and two groups of limiting plates 42. The sliding shaft 41 is slidably connected in the straight slot 301, and the two groups of limiting plates 42 are fixedly connected to the two ends of the sliding shaft 41 respectively. The outer wall on the same side of the lower support rod 2 and the upper folding rod 3 slides in contact with one group of limiting plates 42, and the inner wall on the same side of the lower support rod 2 and the upper folding rod 3 slides in contact with the other group of limiting plates 42. The position of the upper folding rod 3 can be limited by the set limiting plates 42, so that it cannot rotate, thereby ensuring the stability of the upper folding rod 3 when in use.

[0061] Further, such as Figure 5 As shown, the folding support structure further includes a shifting rod 43 , which is fixedly connected between two limiting plates 42 that are in sliding contact with the outer wall of the upper folding rod 3 .

[0062] Specifically, when folding is required, the staff can push the lever 43 upwards, and the lever 43 drives the limit slider 4 to slide upwards through the limit plate 42. When the limit plate 42 stops contacting the lower support rod 2, the staff can rotate the upper folding rod 3 clockwise to fold. After folding is completed, the main shaft 22 is located above the lower support rod 2 and the upper folding rod 3, so that the staff can lift it up for transportation.

[0063] By providing the shift lever 43 , the staff only needs one hand to control the movement of the two limit sliders 4 at the same time when folding, thereby making it easier for the staff to use the other hand to control the rotation of the upper folding rod 3 .

[0064] Example 2

[0065] like Figures 1-15 As shown, this embodiment has made the following improvements on the basis of the first embodiment: further, combined with Figure 1 and Figure 6As shown, a hollow box 7 is clamped on the top of the base 1 , and a plurality of clamping slots 701 are provided on the top of the hollow box 7 . During installation, the staff only needs to clamp the collecting bottle 11 on the clamping slots 701 .

[0066] Further, combined Figure 1 、 Figure 6 and Figure 8 , a same fixing plate 23 is fixedly connected between the two lower support rods 2, and the horizontal supporting structure includes two transverse sliding rails 5 connected to the fixing plate 23, and the two transverse sliding rails 5 are symmetrically distributed on one side of the fixing plate 23. After the collecting bottle 11 is installed, the negative pressure bottle 12 is installed. When installing the negative pressure bottle 12, the negative pressure bottle 12 is placed on the transverse sliding rail 5. At this time, the bottom of the negative pressure bottle 12 is in contact with the top of the two transverse sliding rails 5. The negative pressure bottle 12 can be supported by the two transverse sliding rails 5. A slide groove 501 is provided on the top of the sliding rail 5. Two first side clamps 51 are slidably connected in the slide groove 501. The close ends of the two first side clamps 51 are fixedly connected with a first rubber pad 52. The negative pressure bottle 12 is located between the two first side clamps 51, and both sides of the negative pressure bottle 12 are in contact with the corresponding first rubber pads 52;

[0067] The negative pressure bottle 12 is connected to an external air pump.

[0068] Furthermore, a plurality of first sockets 502 are provided on the sliding rail 5 . The first side clamping plate 51 is L-shaped, and a positioning pin 53 is detachably connected to the horizontal end of the first side clamping plate 51 . The positioning pin 53 is connected to one of the first sockets 502 .

[0069] Specifically, after placing the negative pressure bottle 12 on the horizontal sliding track 5, pull out the corresponding positioning pin 53 and push the two first side clamps 51 to make the corresponding first rubber pads 52 fit with the negative pressure bottle 12, and then reinsert the positioning pin 53 to limit the position of the first side clamp 51 to prevent the negative pressure bottle 12 from shifting during use.

[0070] Further, such as Figure 1 、 Figure 13-15 As shown, the flow rate regulating structure includes a liquid inlet cylinder 9, which is cylindrical and transparent throughout. The top of the liquid inlet cylinder 9 is connected to a liquid inlet pipe 91, and the bottom is connected to a liquid discharge pipe 92. The liquid inlet cylinder 9 is rotatably connected to a rotating shaft 93, one end of the rotating shaft 93 passes through the liquid inlet cylinder 9, and the end is sleeved with a rubber sleeve 94. The rotating shaft 93 located inside the liquid inlet cylinder 9 is fixedly sleeved with a blocking plate 95. The top of the blocking plate 95 is in sliding contact with the inner wall of the liquid inlet cylinder 9 and is connected to the liquid inlet pipe 91.

[0071] Specifically, during installation, the drain pipe 92 is connected to the liquid inlet end of the negative pressure bottle 12, and then the liquid outlet end of the solid phase extraction column 13 is inserted into the liquid inlet pipe 91, and then the liquid outlet end of the liquid outlet tank 14 is plugged into the top of the solid phase extraction column 13. During the extraction process, the liquid in the liquid outlet tank 14 will flow into the solid phase extraction column 13, and will be adsorbed by the target substance in the liquid by the fixed relative. The adsorbed liquid will flow into the liquid inlet cylinder 9 through the liquid inlet pipe 91, and will be discharged into the negative pressure bottle 12 through the drain pipe 92, and finally will flow into the collection bottle 11 through the liquid outlet end of the negative pressure bottle 12 for collection;

[0072] During use, when the staff wants to speed up the flow rate of the liquid, the air in the negative pressure bottle 12 is extracted through an external vacuum pump to generate negative pressure inside the negative pressure bottle, thereby helping to speed up the flow rate of the liquid in the solid phase extraction column 13.

[0073] Furthermore, during use, when the staff feels that the flow rate of the liquid is too fast and wants to slow down the flow rate of the liquid, the staff turns off the vacuum pump and then rotates the rubber sleeve 94 clockwise, driving the rotating shaft 93 to rotate in the same direction through the rubber sleeve 94. During the rotation, the blocking plate 95 blocks the communication port between the liquid inlet pipe 91 and the liquid inlet cylinder 9, thereby reducing the communication port diameter between the liquid inlet pipe 91 and the liquid inlet cylinder 9, thereby reducing the liquid flow rate in the solid phase extraction column 13;

[0074] The liquid inlet cylinder 9 is transparent throughout, so that the staff can adjust the communication diameter between the liquid inlet pipe 91 and the liquid inlet cylinder 9.

[0075] Example 3

[0076] like Figures 1-15 As shown, this embodiment is improved on the basis of the second embodiment as follows: in order to improve the adsorption efficiency of the target substance, the staff can connect multiple solid phase extraction columns 13 with stationary phase end to end. After the connection is completed, the liquid outlet end of the bottom solid phase extraction column 13 is inserted into the liquid inlet pipe 91, and the liquid outlet end of the liquid outlet tank 14 is connected to the liquid inlet end of the top solid phase extraction column 13. In order to avoid the collapse of the solid phase extraction column 13 and the liquid outlet tank 14 during use, further, combined with Figure 2 、 Figures 9-12 , a plurality of U-shaped holders 32 are equidistantly arranged at the ends of the two upper folding rods 3 that are close to each other;

[0077] like Figure 10 As shown, the clamping structure includes a fixing rod 6, two clamping seats 32 located on the same horizontal plane are clamped with the same fixing rod 6, and the fixing rod 6 is detachably slidably connected to a transverse support rod 61, as shown in FIG. Figure 11As shown, spring receiving grooves 601 are symmetrically formed on both sides of one end of the transverse support rod 61, a limit rod 62 is fixedly connected to the spring receiving groove 601, a second side clamping plate 63 is slidably sleeved on the limit rod 62, a first spring 64 is sleeved on the limit rod 62, one end of the first spring 64 is fixedly connected to the end surface of the spring receiving groove 601, and the other end is fixedly connected to the second side clamping plate 63, the free end of the limit rod 62 passes through the second side clamping plate 63 and extends outward, and the end is fixedly connected to the locking sleeve 65;

[0078] A second rubber pad 66 is fixedly connected to the adjacent side of the two second side clamping plates 63 .

[0079] Specifically, during use, the staff uses the thumb and index finger to stretch the two second rubber pads 66 outward. At this time, the corresponding first spring 64 is in a stretched state. After the solid phase extraction column 13 is connected, the second rubber pad 66 is released. At this time, the first spring 64 in the stretched state will shrink and reset, thereby driving the two second rubber pads 66 to close inward, thereby clamping the solid phase extraction column 13 after the connection is completed. The clamping principle of the clamping structure for the liquid outlet tank 14 is the same as the above-mentioned clamping principle for the solid phase extraction column 13, which will not be repeated here.

[0080] There are several clamping seats 32 , so that the staff can place the clamping structure accordingly according to the height of the solid phase extraction column 13 and the liquid outlet tank 14 for clamping.

[0081] Further, such as Figure 10 As shown, the fixed rod 6 is provided with a plurality of mounting grooves 602 corresponding one to one with the transverse support rod 61, and a plurality of inner recesses 6101 are provided on the top of the transverse support rod 61, which are adapted to the mounting groove 602, and a limiting plate 67 is rotatably connected in the mounting groove 602. Specifically, when in use, the staff can pull the transverse support rod 61 according to the distance of the solid phase extraction column 13, so as to adjust the position of the second side splint 63. After the adjustment, the limiting plate 67 is rotated to the mounting groove 602, and the limiting plate 67 is engaged with one of the inner recesses 6101, thereby limiting the transverse support rod 61 through the limiting plate 67.

[0082] like Figure 12 As shown, a snap-in groove 6201 is provided on the limiting rod 62, and a clamping block 6301 is fixedly connected to the second side splint 63 and is slidably connected to the snap-in groove 6201. The clamping block 6301 can be limited by the provided snap-in groove 6201, thereby preventing the second side splint 63 from rotating.

[0083] Further, such as Figure 9As shown, the tops of the two upper folding rods 3 are fixedly connected with an upper cover plate 8, and the inner wall of the upper folding rod 3 is slidably connected with an inverted U-shaped slide plate 81. A limiting groove 302 is provided on the side of the upper folding rod 3 close to the card seat 32, and the limiting groove 302 is located between two adjacent card seats 32. A plurality of connecting rods 82 corresponding to the limiting grooves 302 are fixedly connected to the side of the slide plate 81 close to the card seat 32. The connecting rods 82 are slidably connected to the corresponding limiting grooves 302, and the free ends of the connecting rods 82 are fixedly connected with a pressing plate 83, and the pressing plate 83 is located between two adjacent card seats 32.

[0084] The inner wall of the upper folding rod 3 is fixedly connected to a spring support plate 33, which is slidably connected to the inner wall of the slide plate 81. The top inner wall of the slide plate 81 is fixedly connected to a spring limiting rod 86, which slides through the spring support plate 33 and extends below it. A second spring 84 is sleeved on the spring limiting rod 86, and the top of the second spring 84 abuts against the top inner wall of the slide plate 81, and the bottom abuts against the spring support plate 33.

[0085] The upper cover plate 8 is threadedly connected with a bolt head 85 , and the bottom of the bolt head 85 passes through the upper cover plate 8 and abuts against the top of the slide plate 81 .

[0086] Specifically, after the fixing rod 6 is clamped on the corresponding clamping seat 32, the bolt head 85 is rotated. Under the action of the threaded engagement, the bolt head 85 moves downward. During the movement, the bolt head 85 pushes the slide plate 81 to slide downward. The slide plate 81 simultaneously drives the multiple pressure plates 83 to move downward through the multiple connecting rods 82. When the pressure plates 83 abut against the corresponding fixing rod 6, the rotation of the bolt head 85 is stopped. The fixing rod 6 is limited and fixed by the pressure plates 83 to prevent the fixing rod 6 from falling off the clamping seat 32 after the upper folding rod 3 is folded.

[0087] When the slide plate 81 slides downward, the second spring 84 is compressed. When the fixing rod 6 needs to be removed, it is only necessary to rotate the bolt head 85 in the opposite direction to reset it. At the same time, the downward thrust exerted by the bolt head 85 on the slide plate 81 disappears. At this time, the second spring 84 in the compressed state will stretch and reset and push the slide plate 81 to reset, thereby resetting the pressure plate 83, making it easier for the staff to remove the fixing rod 6.

[0088] In summary, the workflow of this utility model is as follows:

[0089] During installation: the staff will place the collecting bottle 11 on the card slot 701, then place the negative pressure bottle 12 on the horizontal sliding track 5 and connect the liquid outlet end of the negative pressure bottle 12 with the corresponding collecting bottle 11, then pull out the corresponding positioning pin 53 and push the two first side splints 51 to make the corresponding first rubber pad 52 fit with the negative pressure bottle 12, then reinsert the positioning pin 53 to limit the position of the first side splint 51.

[0090] The staff will plug multiple solid phase extraction columns 13 with stationary phases together end to end as needed. After the plugging is completed, the liquid outlet end of the bottom solid phase extraction column 13 is inserted into the liquid inlet pipe 91, and the liquid outlet end of the liquid outlet tank 14 is plugged into the liquid inlet end of the top solid phase extraction column 13. The staff will use the thumb and index finger to stretch the two second rubber pads 66 outward. At this time, the corresponding first spring 64 is in a stretched state. After the solid phase extraction column 13 is connected, the second rubber pad 66 is released. At this time, the first spring 64 in a stretched state will shrink and reset, and then drive the two second rubber pads 66 to close inward, thereby clamping the solid phase extraction column 13 after the connection is completed. The clamping principle of the clamping structure for the liquid outlet tank 14 is the same as the above-mentioned clamping principle for the solid phase extraction column 13, which will not be repeated here.

[0091] When folding: after removing the collecting bottle 11, negative pressure bottle 12, solid phase extraction column 13 and liquid outlet tank 14, push the lever 43 upwards, and the lever 43 drives the limit slider 4 to slide upwards through the limit plate 42. When the limit plate 42 stops contacting the lower support rod 2, the staff can rotate the upper folding rod 3 clockwise to fold it. After folding, the main shaft 22 is located above the lower support rod 2 and the upper folding rod 3, so that the staff can lift it for transportation.

[0092] The above different embodiments can be combined, replaced and used in conjunction with each other.

[0093] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0094] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A solid phase extraction device for pesticide residue detection, characterized by: The invention comprises a base (1), a plurality of collecting bottles (11) are placed on the base (1), a folding support structure is fixedly connected to both sides of the base (1), the folding support structure comprises a lower support rod (2) installed on both sides of the base (1), the top of the lower support rod (2) is rotatably connected to an upper folding rod (3), the upper folding rod (3) is slidably connected to a limit slider (4), and the inner wall of the limit slider (4) is in contact with the lower support rod (2) and the upper folding rod (3); A horizontal support structure is installed on one side of the lower support rod (2), and a negative pressure bottle (12) is clamped on the horizontal support structure. The negative pressure bottle (12) is provided with a plurality of liquid inlet ends and liquid outlet ends. The liquid inlet end of the negative pressure bottle (12) is connected to a flow rate regulating structure, and the liquid outlet end is connected to a corresponding collecting bottle (11). The liquid inlet end of the flow rate regulating structure is connected to a solid phase extraction column (13), and a stationary phase is placed in the solid phase extraction column (13). The top of the solid phase extraction column (13) is connected to a liquid outlet tank (14); Multiple groups of clamping structures are provided between the two upper folding rods (3).

2. The solid phase extraction device for pesticide residue detection according to claim 1, characterized in that: The lower support rod (2) and the upper folding rod (3) are both U-shaped, a first connecting ear (21) is symmetrically provided on one side of the top of the lower support rod (2), and a plurality of the first connecting ears (21) are fixedly connected to the same main shaft (22), and a second connecting ear (31) is symmetrically provided on one side of the bottom of the upper folding rod (3), and a plurality of the second connecting ears (31) are rotatably connected to the main shaft (22); A straight slot (301) is provided on one side of the upper folding rod (3), and the limit slider (4) includes a sliding shaft (41) and two sets of limit plates (42). The sliding shaft (41) is slidably connected in the straight slot (301), and the two sets of limit plates (42) are fixedly connected to the two ends of the sliding shaft (41), respectively. The outer wall on the same side of the lower support rod (2) and the upper folding rod (3) is in sliding contact with one set of limit plates (42), and the inner wall on the same side of the lower support rod (2) and the upper folding rod (3) is in sliding contact with the other set of limit plates (42).

3. The solid phase extraction device for pesticide residue detection according to claim 2, characterized in that: The folding support structure further comprises a shifting rod (43), wherein the shifting rod (43) is fixedly connected between two limiting plates (42) in sliding contact with the outer wall of the upper folding rod (3).

4. The solid phase extraction device for pesticide residue detection according to claim 1, characterized in that: A fixed plate (23) is fixedly connected between the two lower support rods (2), and the horizontal support structure includes two transverse sliding rails (5) connected to the fixed plate (23). The two transverse sliding rails (5) are symmetrically distributed on one side of the fixed plate (23), and the bottom of the negative pressure bottle (12) is in contact with the top of the two transverse sliding rails (5); A slide groove (501) is provided on the top of the sliding track (5), and two first side clamps (51) are slidably connected in the slide groove (501), and a first rubber pad (52) is fixedly connected to the adjacent ends of the two first side clamps (51), and the negative pressure bottle (12) is located between the two first side clamps (51), and both sides of the negative pressure bottle (12) are in contact with the corresponding first rubber pads (52); The negative pressure bottle (12) is connected to an external air pump.

5. The solid phase extraction device for pesticide residue detection according to claim 4, characterized in that: The sliding rail (5) is provided with a plurality of first sockets (502), the first side clamp (51) is L-shaped, and a positioning pin (53) is detachably inserted into the horizontal end of the first side clamp (51), and the positioning pin (53) is inserted into one of the first sockets (502).

6. The solid phase extraction device for pesticide residue detection according to claim 1, characterized in that: A plurality of U-shaped holders (32) are equidistantly provided at the adjacent ends of the two upper folding rods (3); The clamping structure includes a fixing rod (6), two clamping seats (32) located on the same horizontal plane are clamped with the same fixing rod (6), the fixing rod (6) is detachably slidably connected to a transverse support rod (61), one end of the transverse support rod (61) is symmetrically provided with spring receiving grooves (601), a limiting rod (62) is fixedly connected in the spring receiving groove (601), a second side clamping plate (63) is slidably sleeved on the limiting rod (62), a first spring (64) is sleeved on the limiting rod (62), one end of the first spring (64) is fixedly connected to the end face of the spring receiving groove (601), and the other end is fixedly connected to the second side clamping plate (63), the free end of the limiting rod (62) passes through the second side clamping plate (63) and extends outward, and the end thereof is fixedly connected to a locking sleeve (65); A second rubber pad (66) is fixedly connected to the adjacent side of the two second side clamping plates (63).

7. The solid phase extraction device for pesticide residue detection according to claim 6, characterized in that: The fixing rod (6) is provided with a plurality of mounting grooves (602) corresponding to the transverse support rods (61) one by one. The top of the transverse support rod (61) is provided with a plurality of inner recesses (6101), the inner recesses (6101) are adapted to the mounting grooves (602), and a limiting piece (67) is rotatably connected in the mounting groove (602), and the limiting piece (67) is engaged with one of the inner recesses (6101); A clamping groove (6201) is provided on the limiting rod (62), and a clamping block (6301) is fixedly connected to the second side clamping plate (63) and is slidably connected to the clamping groove (6201).

8. The solid phase extraction device for pesticide residue detection according to claim 7, characterized in that: The tops of the two upper folding rods (3) are fixedly connected to an upper cover plate (8), the inner walls of the upper folding rods (3) are slidably connected to an inverted U-shaped slide plate (81), a limiting groove (302) is provided on one side of the upper folding rod (3) close to the card seat (32), and the limiting groove (302) is located between two adjacent card seats (32), and a plurality of connecting rods (82) corresponding to the limiting grooves (302) are fixedly connected to one side of the slide plate (81) close to the card seat (32), the connecting rods (82) are slidably connected to the corresponding limiting grooves (302), and the free ends of the connecting rods (82) are fixedly connected to a pressing plate (83), and the pressing plate (83) is located between the two adjacent card seats (32); The inner wall of the upper folding rod (3) is fixedly connected to a spring support plate (33), the spring support plate (33) is slidably connected to the inner wall of the slide plate (81), the top inner wall of the slide plate (81) is fixedly connected to a spring limiting rod (86), the spring limiting rod (86) slides through the spring support plate (33) and extends to the bottom thereof, a second spring (84) is sleeved on the spring limiting rod (86), the top of the second spring (84) abuts against the top inner wall of the slide plate (81), and the bottom abuts against the spring support plate (33); The upper cover plate (8) is threadedly connected with a bolt head (85), and the bottom of the bolt head (85) passes through the upper cover plate (8) and abuts against the top of the slide plate (81).

9. The solid phase extraction device for pesticide residue detection according to claim 1, characterized in that: The flow rate regulating structure comprises a liquid inlet cylinder (9), the liquid inlet cylinder (9) is cylindrical and transparent, the top of the liquid inlet cylinder (9) is connected to a liquid inlet pipe (91), and the bottom is connected to a liquid discharge pipe (92), the liquid inlet cylinder (9) is rotatably connected to a rotating shaft (93), one end of the rotating shaft (93) passes through the liquid inlet cylinder (9), and the end is sleeved with a rubber sleeve (94), the rotating shaft (93) located inside the liquid inlet cylinder (9) is fixedly sleeved with a blocking plate (95), the top of the blocking plate (95) is in sliding contact with the inner wall of the liquid inlet cylinder (9) and is connected to the liquid inlet pipe (91); The liquid discharge pipe (92) is in communication with the liquid inlet end of the negative pressure bottle (12).

10. The solid phase extraction device for pesticide residue detection according to claim 1, characterized in that: A hollow box (7) is clamped on the top of the base (1), and a plurality of clamping slots (701) are provided on the top of the hollow box (7), and the collecting bottle (11) is clamped on the clamping slots (701).

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