An agricultural planting soil pesticide residue detection device

Abstract

The present invention relates to the technical field of soil detection, and particularly to a device for detecting agricultural residues in agricultural planting soil. It includes a bottom plate, on which a liquid preparation device is fixed. The liquid outlet end of the liquid preparation device is communicated with a detector. A through hole is provided on the bottom plate. A sampling assembly is slidably arranged on the bottom plate on one side of the liquid preparation device. The sampling assembly is connected to a driving assembly on the bottom plate; the sampling assembly includes a bracket, the bracket is slidably connected to the bottom plate, a vertical telescopic rod is fixed at the upper end of the bracket, and a sampling head is fixed at the lower end of the telescopic rod. The driving assembly can drive the sampling assembly to move and make the sampling head located above the inlet end of the liquid preparation device or above the through hole. After the sampling head is inserted into the soil, when the outer ring and the inner ring move downward, the middle parts of the outer deformation sleeve and the inner deformation sleeve can shrink towards the inner rod, so that the soil between the inner deformation sleeve and the outer deformation sleeve can be extruded. When the sampling head is pulled out of the soil, it can prevent the soil sample between the inner deformation sleeve and the outer deformation sleeve from falling out.

Description

Technical Field

[0001] The present invention relates to the technical field of soil detection, and more particularly to an agricultural planting soil pesticide residue detection device. Background Art

[0002] The development of agricultural industrialization has made the production of agricultural products increasingly dependent on exogenous substances such as pesticides, antibiotics, and hormones. Countries around the world attach great importance to the problem of pesticide residues and have stipulated increasingly strict limit standards for pesticide residues in various agricultural and sideline products. The soil in agricultural planting areas now contains complex components, and it is usually necessary to take soil samples for detection.

[0003] When using a conventional sampler to take soil samples, during the process of pulling the sampler upward after it is inserted into the soil, the soil samples in the lower layer of the sampler are likely to fall out of the sampler, which may easily lead to incomplete sampling and thus result in a low accuracy of the pesticide residue detection in agricultural planting soil. Some of the existing agricultural planting soil pesticide residue detection devices cannot perform on-site detection. Instead, the samples need to be processed after sampling and then detected in a laboratory. When there are many plots to be detected, the samples are prone to confusion, and the entire detection process is rather troublesome. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an agricultural planting soil pesticide residue detection device that can perform on-site detection, can avoid the soil samples from falling out during sampling, and can ensure the integrity of the soil samples.

[0005] An agricultural planting soil pesticide residue detection device includes a bottom plate. A liquid preparation device is fixed on the bottom plate. The liquid outlet end of the liquid preparation device is communicated with a detector. A through hole is opened on the bottom plate. A sampling component is slidably arranged on the bottom plate on one side of the liquid preparation device. The sampling component is connected to a driving component on the bottom plate; the sampling component includes a bracket. The bracket is slidably connected to the bottom plate. A vertical telescopic rod is fixed at the upper end of the bracket. A sampling head is fixed at the lower end of the telescopic rod. The driving component can drive the sampling component to move and make the sampling head located above the inlet end of the liquid preparation device or above the through hole; the sampling head includes a connecting frame fixedly connected to the lower end of the telescopic rod. An inner rod is concentrically fixed at the lower end of the connecting frame. An inner ring is arranged below the connecting frame. The inner ring is slidably sleeved on the inner rod. An outer ring is concentrically arranged outside the inner ring. A driving unit capable of driving the inner ring and the outer ring to descend simultaneously is arranged on the connecting frame. A cone is concentrically fixed at the lower end of the inner rod. A bottom ring is concentrically arranged outside the cone. The bottom ring and the cone are fixedly connected by a plurality of fixing rods. The outer ring and the bottom ring are fixedly connected by an outer deformation sleeve. The upper ends of the inner ring and the cone are connected by an inner deformation sleeve. The middle part of the inner side of the outer deformation sleeve and the middle part of the outer side of the inner deformation sleeve are connected by a plurality of pull ropes. A plurality of first magnetic blocks are fixedly arranged on the circumference of the middle part of the inner side of the inner deformation sleeve. A plurality of second magnetic blocks are fixedly arranged on the circumference of the outer side of the inner rod. The first magnetic blocks and the second magnetic blocks are in one-to-one correspondence. The magnetic poles of the opposite ends of the first magnetic blocks and the second magnetic blocks are opposite. When the driving unit drives the inner ring and the outer ring to descend, the middle parts of the outer deformation sleeve and the inner deformation sleeve contract towards the inner rod direction.

[0006] Specifically, the driving unit includes a vertically arranged electric push rod. The electric push rod is fixed inside the connecting frame. A sliding disk is fixed at the lower end of the electric push rod. A plurality of telescopic members are evenly arranged on the circumference of the lower end of the connecting frame. One end of the telescopic member is rotatably connected to the lower end of the connecting frame. The other end of the telescopic member is rotatably connected to the upper end of the outer ring. The lower end of the telescopic member contacts the upper end of the inner ring. The telescopic member and the sliding disk are connected by a first connecting rod. The first connecting rod is obliquely arranged. The upper end of the first connecting rod is rotatably connected to the sliding disk. The lower end of the first connecting rod is rotatably connected to the telescopic member.

[0007] Specifically, the telescopic member includes a second connecting rod and a slider. The slider is slidably connected to the second connecting rod. The sliding direction of the slider is parallel to the length direction of the second connecting rod. One end of the second connecting rod away from the slider is rotatably connected to the lower end of the connecting frame. An ear seat is rotatably connected to the slider. The ear seat is fixed to the upper end of the outer ring. The lower end of the first connecting rod is rotatably connected to the second connecting rod.

[0008] Specifically, the outer deformation sleeve includes a plurality of outer arc-shaped plates. The plurality of outer arc-shaped plates are evenly arranged according to the axis of the inner rod in a circular pattern. The bottom ring and the outer ring are fixedly connected by a plurality of outer arc-shaped plates. The outer arc-shaped plates are elastic. Adjacent two outer arc-shaped plates are connected by an elastic membrane; the inner deformation sleeve includes a plurality of inner arc-shaped plates. The plurality of inner arc-shaped plates are evenly arranged in a circular pattern. The upper ends of the inner ring and the cone are fixedly connected by a plurality of inner arc-shaped plates. The inner arc-shaped plates are elastic. Adjacent two inner arc-shaped plates are connected by an elastic membrane.

[0009] Specifically, the number of the inner arc-shaped plates and the outer arc-shaped plates is equal and they correspond to each other one by one. The number of the pull ropes is equal to that of the outer arc-shaped plates and they correspond to each other one by one. One end of each pull rope is fixedly connected to the middle part of the outer arc-shaped plate, and the other end of the pull rope is fixedly connected to the middle part of the inner arc-shaped plate. The number of the first magnetic blocks is equal to that of the inner arc-shaped plates and they correspond to each other one by one. The first magnetic blocks are fixed to the middle parts of the inner arc-shaped plates. The middle parts of the inner arc-shaped plates and the outer arc-shaped plates are both bent towards the inner rod.

[0010] Specifically, the liquid preparation device includes a cylinder body. A feed hopper is fixedly communicated with the upper end of the cylinder body. A crushing assembly is arranged in the feed hopper. A liquid inlet is opened at the upper end of the cylinder body. A stirring assembly is arranged in the cylinder body. A liquid extraction pipe is fixedly communicated with the cylinder body. A water pump is installed on the liquid extraction pipe. The liquid outlet end of the liquid extraction pipe is communicated with a detector.

[0011] Specifically, the driving assembly includes a support plate fixed on the bracket. A fixing plate is fixed to the upper end of the bottom plate. A screw rod is rotatably connected to the fixing plate. The screw rod is in threaded connection with the support plate. A motor is fixed to the fixing plate. The output shaft of the motor is fixedly connected to the screw rod concentrically.

[0012] Beneficial effects: 1. After the sampling head is inserted into the soil, when the outer ring and the inner ring move downward, the middle parts of the outer deformation sleeve and the inner deformation sleeve can contract towards the inner rod. Since the downward distance of the outer ring is greater than that of the inner ring, the deformation amount of the outer deformation sleeve is greater than that of the inner deformation sleeve. Furthermore, the soil between the inner deformation sleeve and the outer deformation sleeve can be extruded. When the sampling head is pulled out of the soil, the soil sample between the inner deformation sleeve and the outer deformation sleeve can be prevented from falling out, and the integrity of the soil sample can be ensured.

[0013] 2. After the soil sample is taken out, a sample solution can be prepared in the liquid preparation device, and the soil pesticide residues can be detected on site, with high detection efficiency. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of the present invention.

[0015] Figure 2 is a schematic diagram of the sampling head.

[0016] Figure 3 is Figure 2 an enlarged view of area A in

[0017] Figure 4 is a schematic diagram of the cross-section of the sampling head.

[0018] Figure 5 is a longitudinal sectional view of the sampling head.

[0019] Figure 6 is Figure 5 an enlarged view of area B in

[0020] Figure 7 It is a schematic diagram of the connection between the cone and the bottom ring.

[0021] Figure 8 It is a schematic diagram of the extrusion of the soil sample after the middle parts of the outer arc-shaped plate and the inner arc-shaped plate are bent towards the inner rod.

[0022] Figure 9 It is the rear view of the present invention.

[0023] The names of the components in the drawings are: 1. bottom plate; 2. cylinder body; 3. liquid extraction pipe; 4. water pump; 5. detector; 6. motor; 7. feed hopper; 8. first magnet; 9. cone; 10. through hole; 11. liquid inlet; 12. bracket; 13. telescopic rod; 14. connecting frame; 15. outer arc-shaped plate; 16. elastic membrane; 17. electric push rod; 18. sliding disk; 19. first connecting rod; 20. second connecting rod; 21. slider; 22. outer ring; 23. inner ring; 24. fixing plate; 25. ear seat; 26. bottom ring; 27. pull rope; 28. inner arc-shaped plate; 29. second magnet; 30. inner rod; 31. support plate; 32. screw rod. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0025] As Figures 1-9 shown, an agricultural planting soil pesticide residue detection device includes a bottom plate 1, on which a liquid preparation device is fixed, and the liquid outlet end of the liquid preparation device is communicated with the detector 5.

[0026] The liquid preparation device includes a cylinder body 2, at the upper end of which a feed hopper 7 is fixedly communicated. A crushing assembly is arranged in the feed hopper 7. A liquid inlet 11 is opened at the upper end of the cylinder body 2. A stirring assembly is arranged in the cylinder body 2. A liquid extraction pipe 3 is fixedly communicated with the cylinder body 2. A water pump 4 is installed on the liquid extraction pipe 3, and the liquid outlet end of the liquid extraction pipe 3 is communicated with the detector 5.

[0027] A through hole 10 is opened on the bottom plate 1. A sampling assembly is slidably arranged on the bottom plate 1 on one side of the liquid preparation device, and the sampling assembly is connected with a driving assembly on the bottom plate 1.

[0028] The sampling assembly includes a bracket 12, which is slidably connected with the bottom plate 1. A vertical telescopic rod 13 is fixed at the upper end of the bracket 12, and a sampling head is fixed at the lower end of the telescopic rod 13. The driving assembly can drive the sampling assembly to move and make the sampling head located above the inlet end of the liquid preparation device or above the through hole 10.

[0029] As Figure 9As shown, the driving assembly includes a support plate 31 fixed on the bracket 12. A fixing plate 24 is fixed at the upper end of the bottom plate 1. A screw rod 32 is rotatably connected to the fixing plate 24. The screw rod 32 is threadedly connected to the support plate 31. A motor 6 is fixed on the fixing plate 24. The output shaft of the motor 6 is concentrically and fixedly connected to the screw rod 32.

[0030] As Figures 2-5 shown, the sampling head includes a connecting frame 14 fixedly connected to the lower end of the telescopic rod 13. An inner rod 30 is concentrically and fixedly connected to the lower end of the connecting frame 14. An inner ring 23 is arranged below the connecting frame 14. The inner ring 23 is slidably sleeved on the inner rod 30. An outer ring 22 is concentrically arranged outside the inner ring 23. A driving unit capable of driving the inner ring

[0031] 23 and the outer ring 22 to descend simultaneously is arranged on the connecting frame 14.

[0032] The driving unit includes a vertically arranged electric push rod 17. The electric push rod 17 is fixed inside the connecting frame 14. A sliding disk 18 is fixed at the lower end of the electric push rod 17. A plurality of telescopic members are circumferentially and uniformly arranged at the lower end of the connecting frame 14. One end of the telescopic member is rotatably connected to the lower end of the connecting frame 14. The other end of the telescopic member is rotatably connected to the upper end of the outer ring 22. The lower end of the telescopic member contacts the upper end of the inner ring 23. The telescopic member is connected to the sliding disk 18 through a first connecting rod 19. The first connecting rod 19 is obliquely arranged. The upper end of the first connecting rod 19 is rotatably connected to the sliding disk 18. The lower end of the first connecting rod 19 is rotatably connected to the telescopic member.

[0033] Specifically, the telescopic member includes a second connecting rod 20 and a slider 21. The slider 21 is slidably connected to the second connecting rod 20. The sliding direction of the slider 21 is parallel to the length direction of the second connecting rod 20. The end of the second connecting rod 20 away from the slider 21 is rotatably connected to the lower end of the connecting frame 14. An ear seat 25 is rotatably connected to the slider 21. The ear seat 25 is fixed to the upper end of the outer ring 22. Specifically, the lower end of the first connecting rod 19 is rotatably connected to the second connecting rod 20.

[0034] A cone 9 is concentrically and fixedly connected to the lower end of the inner rod 30. A bottom ring 26 is concentrically arranged outside the cone 9. The bottom ring 26 and the cone 9 are fixedly connected through a plurality of fixing rods. The outer ring 22 and the bottom ring 26 are fixedly connected through an outer deformation sleeve. The upper ends of the inner ring 23 and the cone 9 are connected through an inner deformation sleeve. The middle part of the inner side of the outer deformation sleeve and the middle part of the outer side of the inner deformation sleeve are connected through a plurality of pull ropes 27. A plurality of first magnetic blocks 8 are circumferentially and uniformly fixed to the middle part of the inner side of the inner deformation sleeve. A plurality of second magnetic blocks 29 are circumferentially and uniformly fixed to the outer side of the inner rod 30. The first magnetic blocks 8 and the second magnetic blocks 29 are in one-to-one correspondence. The magnetic poles of the opposite ends of the first magnetic blocks 8 and the second magnetic blocks 29 are opposite. When the driving unit drives the inner ring 23 and the outer ring 22 to descend, the middle parts of the outer deformation sleeve and the inner deformation sleeve contract towards the inner rod 30.

[0035] Specifically, the outer deformation sleeve includes a plurality of outer arc plates 15. The plurality of outer arc plates 15 are circumferentially and evenly arranged according to the axis of the inner rod 30. The bottom ring 26 and the outer ring 22 are fixedly connected through the plurality of outer arc plates 15. The outer arc plates 15 are elastic, and adjacent two outer arc plates 15 are connected by an elastic membrane 16.

[0036] The inner deformation sleeve includes a plurality of inner arc plates 28. The plurality of inner arc plates 28 are circumferentially and evenly arranged. The inner ring 23 and the upper end of the cone 9 are fixedly connected through the plurality of inner arc plates 28. The inner arc plates 28 are elastic, and adjacent two inner arc plates 28 are connected by an elastic membrane 16.

[0037] The number of the inner arc plates 28 is equal to and corresponds to that of the outer arc plates 15 one by one. The number of the pull ropes 27 is equal to and corresponds to that of the outer arc plates 15 one by one. One end of the pull rope 27 is fixedly connected to the middle of the outer arc plate 15, and the other end of the pull rope 27 is fixedly connected to the middle of the inner arc plate 28. The number of the first magnetic blocks 8 is equal to and corresponds to that of the inner arc plates 28 one by one. The first magnetic blocks 8 are fixed in the middle of the inner arc plates 28. The middle parts of the inner arc plates 28 and the outer arc plates 15 are bent towards the inner rod 30.

[0038] When sampling, start the motor 6. The motor 6 drives the screw 32 to rotate. When the screw 32 rotates, the support 12, the telescopic rod 13 and the sampling head move through the support plate 31. After the sampling head moves above the through hole 10, turn off the motor 6.

[0039] Then start the telescopic rod 13. The telescopic rod 13 makes the sampling head penetrate through the through hole 10 and insert into the soil. After the sampling head inserts into the soil, part of the soil will enter between the outer deformation sleeve and the inner deformation sleeve through between the bottom ring 26 and the cone 9. The soil between the outer deformation sleeve and the inner deformation sleeve is the soil sample to be detected.

[0040] Then start the electric push rod 17. The electric push rod 17 makes the sliding disk 18 move downward. When the sliding disk 18 moves downward, it drives the second connecting rod 20 and the slider 21 to swing downward through the first connecting rod 19. During the process that the first connecting rod 19 drives the second connecting rod 20 and the slider 21 to swing downward, the outer ring 22 and the inner ring 23 move downward. Since the outer ring 22 is located outside the inner ring 23, the downward movement distance of the outer ring 22 is greater than that of the inner ring 23. During the process that the second connecting rod 20 and the slider 21 swing downward, the slider 21 slides relative to the second connecting rod 20.

[0041] Since one end of the drawstring 27 is fixedly connected to the middle of the outer arc-shaped plate 15, and the other end of the drawstring 27 is fixedly connected to the middle of the inner arc-shaped plate 28, the number of the first magnetic blocks 8 is equal to that of the inner arc-shaped plates 28 and they are in one-to-one correspondence. The first magnetic blocks 8 are fixed in the middle of the inner arc-shaped plates 28. A plurality of second magnetic blocks 29 are fixedly distributed on the outer circumference of the inner rod 30, and the first magnetic blocks 8 and the second magnetic blocks 29 are in one-to-one correspondence. The magnetic poles of the opposite ends of the first magnetic blocks 8 and the second magnetic blocks 29 are opposite. Therefore, under the magnetic attraction of the first magnetic blocks 8 and the second magnetic blocks 29, the middle parts of the inner arc-shaped plate 28 and the outer arc-shaped plate 15 both bend towards the inner rod 30. When the inner ring 23 and the outer ring 22 move downward, the middle parts of the outer arc-shaped plate 15 and the inner arc-shaped plate 28 both bend towards the inner rod 30, that is, the middle parts of the outer deformation sleeve and the inner deformation sleeve contract towards the inner rod 30.

[0042] Also, because the downward movement distance of the outer ring 22 is greater than that of the inner ring 23, the deformation amount of the outer arc-shaped plate 15 is greater than that of the inner arc-shaped plate 28. When the outer ring 22 and the inner ring 23 move downward, the deformation amount of the outer deformation sleeve is greater than that of the inner deformation sleeve. The soil sample between the inner deformation sleeve and the outer deformation sleeve will be squeezed. When the telescopic rod 13 is activated to pull the sampling head out of the soil, the soil sample between the inner deformation sleeve and the outer deformation sleeve can be prevented from falling out, and the integrity of the soil sample can be ensured.

[0043] After the sampling head is pulled out of the soil, the motor 6 is activated. The motor 6 drives the screw 32 to rotate. When the screw 32 rotates, the bracket 12, the telescopic rod 13 and the sampling head move through the support plate 31. When the sampling head moves above the feed hopper 7, the motor 6 is turned off.

[0044] Then the electric push rod 17 is made to drive the sliding disk 18 to move upward and return. During the process of the sliding disk 18 moving upward and returning, the outer arc-shaped plate 15 and the inner arc-shaped plate 28 return, that is, the inner deformation sleeve and the outer deformation sleeve return.

[0045] Since the soil sample is squeezed between the inner deformation sleeve and the outer deformation sleeve during the sampling process, when the inner deformation sleeve and the outer deformation sleeve return, the soil sample is more likely to be discharged between the inner deformation sleeve and the outer deformation sleeve.

[0046] After the soil sample is discharged, it falls into the feed hopper 7 and is crushed by the crushing component in the feed hopper 7. The crushed soil sample falls into the cylinder 2. Water is added into the cylinder 2 through the liquid inlet 11. The stirring component in the cylinder 2 is activated to stir the mixture of water and the soil sample to make a sample solution.

[0047] Then the water pump 4 is activated. The water pump 4 transports a quantitative sample solution to the detector 5 for detection. After detection, the soil pesticide residue data can be obtained.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for detecting pesticide residues in agricultural planting soil, comprising a base plate (1), a liquid preparation device being fixed on the base plate (1), a liquid outlet of the liquid preparation device being connected to a detector (5), characterized in that: A through hole (10) is provided on the bottom plate (1), a sampling assembly is slidably provided on the bottom plate (1) on one side of the liquid preparation device, and the sampling assembly is connected to a driving assembly on the bottom plate (1); the sampling assembly comprises a bracket (12), the bracket (12) is slidably connected to the bottom plate (1), a vertical telescopic rod (13) is fixed to the upper end of the bracket (12), a sampling head is fixed to the lower end of the telescopic rod (13), and the driving assembly can drive the sampling assembly to move and make the sampling head located above the inlet end of the liquid preparation device or above the through hole (10); the sampling head comprises a connecting frame (14) fixedly connected to the lower end of the telescopic rod (13), an inner rod (30) is concentrically fixed to the lower end of the connecting frame (14), an inner ring (23) is provided below the connecting frame (14), and the inner ring (23) is slidably sleeved On the inner rod (30), an outer ring (22) is concentrically arranged outside the inner ring (23), and a driving unit capable of driving the inner ring (23) and the outer ring (22) to move downward simultaneously is arranged on the connecting frame (14). A cone (9) is concentrically fixed to the lower end of the inner rod (30), and a bottom ring (26) is concentrically arranged outside the cone (9). The bottom ring (26) and the cone (9) are fixedly connected by a plurality of fixing rods, and the outer ring (22) and the bottom ring (26) are fixedly connected by an outer deformation sleeve. The inner ring (23) and the upper end of the cone (9) are connected by an inner deformation sleeve. The inner middle of the outer deformation sleeve and the outer middle of the inner deformation sleeve are connected by a plurality of pull ropes (27). A plurality of first magnetic blocks (8) are evenly distributed and fixed on the circumference of the inner middle of the inner deformation sleeve. A plurality of second magnetic blocks (29), the first magnetic block (8) and the second magnetic block (29) correspond one to one, the magnetic poles of the first magnetic block (8) and the second magnetic block (29) at opposite ends are opposite, and when the driving unit drives the inner ring (23) and the outer ring (22) downward, the middle of the outer deformation sleeve and the middle of the inner deformation sleeve contract toward the inner rod (30); the driving unit comprises a vertically arranged electric push rod (17), the electric push rod (17) is fixed in the connecting frame (14), a sliding disk (18) is fixed at the lower end of the electric push rod (17), a plurality of telescopic parts are evenly distributed around the lower end of the connecting frame (14), one end of the telescopic part is rotatably connected to the lower end of the connecting frame (14), the other end of the telescopic part is rotatably connected to the upper end of the outer ring (22), and the lower end of the telescopic part contacts the upper end of the inner ring (23). The telescopic member is connected to the sliding disk (18) through a first connecting rod (19), the first connecting rod (19) is tilted, the upper end of the first connecting rod (19) is rotatably connected to the sliding disk (18), and the lower end of the first connecting rod (19) is rotatably connected to the telescopic member; the telescopic member includes a second connecting rod (20) and a slider (21), the slider (21) is slidably connected to the second connecting rod (20), the sliding direction of the slider (21) is parallel to the length direction of the second connecting rod (20), the end of the second connecting rod (20) away from the slider (21) is rotatably connected to the lower end of the connecting frame (14), the slider (21) is rotatably connected to an ear seat (25), the ear seat (25) is fixed to the upper end of the outer ring (22), and the lower end of the first connecting rod (19) is rotatably connected to the second connecting rod (20);The outer deformation sleeve comprises a plurality of outer arc plates (15), the plurality of outer arc plates (15) are evenly arranged on the circumference of the axis of the inner rod (30), the bottom ring (26) and the outer ring (22) are fixedly connected by the plurality of outer arc plates (15), the outer arc plates (15) are elastic, and two adjacent outer arc plates (15) are connected by an elastic membrane (16); the inner deformation sleeve comprises a plurality of inner arc plates (28), the plurality of inner arc plates (28) are evenly arranged on the circumference, the inner ring (23) and the upper end of the cone (9) are fixedly connected by the plurality of inner arc plates (28), the inner arc plates (28) are elastic, and two adjacent inner arc plates (28) are connected by an elastic membrane (16). ; 2. The agricultural soil pesticide residue detection device according to claim 1, characterized in that: The number of the inner arc plates (28) and the outer arc plates (15) is equal and one-to-one corresponding, the number of the pull ropes (27) is equal and one-to-one corresponding to the number of the outer arc plates (15), one end of the pull rope (27) is fixedly connected to the middle of the outer arc plate (15), and the other end of the pull rope (27) is fixedly connected to the middle of the inner arc plate (28), the number of the first magnetic block (8) and the inner arc plate (28) is equal and one-to-one corresponding, the first magnetic block (8) is fixed to the middle of the inner arc plate (28), and the middle of the inner arc plate (28) and the middle of the outer arc plate (15) are both bent toward the inner rod (30).

3. The agricultural soil pesticide residue detection device according to claim 1, characterized in that: The liquid preparation device comprises a cylinder (2), the upper end of the cylinder (2) is fixedly connected to a feed hopper (7), a crushing assembly is arranged in the feed hopper (7), a liquid inlet (11) is opened at the upper end of the cylinder (2), a stirring assembly is arranged in the cylinder (2), a liquid extraction pipe (3) is fixedly connected to the cylinder (2), a water pump (4) is installed on the liquid extraction pipe (3), and the liquid outlet end of the liquid extraction pipe (3) is connected to a detector (5).

4. The agricultural soil pesticide residue detection device according to claim 1, characterized in that: The driving assembly comprises a support plate (31) fixed on the bracket (12); a fixing plate (24) is fixed on the upper end of the bottom plate (1); a screw rod (32) is rotatably connected to the fixing plate (24); the screw rod (32) is threadedly connected to the support plate (31); a motor (6) is fixed to the fixing plate (24); and an output shaft of the motor (6) is coaxially fixedly connected to the screw rod (32).

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