Soil heavy metal detector

Abstract

The invention discloses a soil heavy metal detector which comprises a machine body, and the machine body is communicated with a first connecting pipe and a second connecting pipe which have plastic performance; the objective table is movably matched with the machine body, and a gear is fixedly connected to the bottom of the objective table; the moving assembly is used for driving the objective table to move so that liquid can be dropwise added conveniently; the movable assembly is matched with the moving assembly and enables the vessel located on the objective table to shake back and forth in a reciprocating mode through a gear; by rotating the adjusting rod in a reciprocating mode, adjustment of up-and-down movement of the objective table and the vessel is completed, the objective table and the vessel are driven to rotate in a reciprocating mode at the same time, on one hand, an operator can dropwise add a mixed indicator according to personal habits conveniently by means of the lifting height, and on the other hand, the operator can conveniently drop the mixed indicator according to personal habits; on the other hand, full and rapid mixing of dropwise added materials is facilitated, and the mode is convenient to operate.

Description

Technical Field

[0001] This invention relates to the field of soil heavy metal instrument technology, specifically a soil heavy metal detector. Background Technology

[0002] Heavy metal testing in soil is one of the routine monitoring items for soil. The quality and safety of plants are closely related to the soil environment of the production area. Heavy metals generally enter the soil first and accumulate. Plants absorb heavy metals from the soil through their roots, thus enriching the soil-plant system and reducing plant quality.

[0003] The existing methods for using heavy metal detection instruments generally involve: first, pre-treating the collected soil to form a test solution; then, subjecting the solution to a digestion reaction using the heavy metal detection instrument; finally, combining the reactants; and calculating the content of a specific metal based on factors such as the amount of reagent consumed. The details are as follows:

[0004] The pre-treated test solution is connected to the instrument via a rubber tube. One side of the instrument is connected to the digestion tube, and the other side is inserted into a container containing the reaction solution placed on the stage. The test solution undergoes reaction in the digestion tube and then enters the container to mix with the reactants, thus obtaining the final test solution. Then, a mixed indicator is added dropwise to the container while shaking until the liquid in the container becomes the standard test solution. The metal content is calculated based on the amount of mixed indicator consumed and the values ​​of the liquid in the container.

[0005] The connecting tube of the heavy metal detection instrument extends into the container, while the position of the stage is fixed, making it inconvenient to add the liquid with the dropper. The container needs to be taken out separately before adding the liquid, which is time-consuming, laborious, and the liquid addition is unstable.

[0006] Therefore, we propose a soil heavy metal detector. Summary of the Invention

[0007] The purpose of this invention is to provide a soil heavy metal detector to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a soil heavy metal detector, comprising a body, wherein a first connecting pipe and a second connecting pipe having plastic properties are connected to the body; further comprising a stage that movably cooperates with the body, wherein a gear is fixedly connected to the bottom of the stage; a moving component, wherein the moving component is used to move the stage to facilitate the dripping of liquid; a movable component, wherein the movable component cooperates with the moving component and, through the gear, causes a container located on the stage to reciprocate; and a switching component, wherein the switching component cooperates with the moving component to ensure that the gear always rotates in one direction.

[0009] Preferably, the moving component includes a movable block that rotatably engages with the platform and a rotating disk that rotates within the machine body. The machine body has a first sliding groove that slidably engages with the movable block. A threaded rod that is threadedly engaged with the movable block rotates within the first sliding groove. A rotating rod is fixedly connected to the top of the threaded rod. A cooperating component is provided on the rotating rod. The rotating rod causes the rotating disk to rotate through the cooperating component. A connecting line that passes through the machine body is movably engaged on the rotating disk. A limiting ring that is sleeved with the second connecting pipe is attached to the end of the connecting line.

[0010] Preferably, the mating assembly includes multiple limiting discs fixedly connected to the outer edge of the rotating disk, a slot is provided in the middle of the rotating disk, a first fixing plate is fixedly connected in the slot, pressure plates are provided on both sides of the first fixing plate, a first compression spring is attached between the pressure plate and the first fixing plate, a second fixing plate is fixedly connected to the rotating rod and presses against the pressure plate, and a pressure assembly is provided in the machine body to cooperate with the limiting discs to retract the connecting line.

[0011] Preferably, the pressing assembly includes a pressing plate that slides within the body of the machine, the pressing plate pressing against the rotating disc, a second compression spring connecting the body and the pressing plate, a movable plate rotatably connected to one of the pressing plates via a first torsion spring, a limiting frame plate fixedly connected within the body of the machine, which slides against the end of the movable plate, a pressing column fixedly connected within the body of the machine, which cooperates with the connecting line and the movable plate, and the connecting line rotatably connected to the central axis of the other pressing plate.

[0012] Preferably, the movable component includes a fixed column that is simultaneously connected and fixed to the platform and rotatably connected to the gear. An adjusting rod is rotatably connected to the fixed column. A first connecting rod is rotatably connected between the adjusting rod and the platform. A connecting plate is fixedly connected to the bottom of the adjusting rod. Both ends of the connecting plate are rotatably connected to ratchet teeth that mesh with the gear through a second torsion spring. A holding component is provided at the bottom of the connecting plate. A connecting component is provided between the fixed column and the threaded rod.

[0013] Preferably, the maintaining assembly includes a first connecting plate fixedly connected to the movable block, a second connecting rod fixedly connected to the middle of the connecting plate, a movable rod fixedly connected to the second connecting rod, and a tension spring rotatably connected to the first connecting plate at the end of the movable rod.

[0014] Preferably, the switching component includes a sector plate rotatably connected to the fixed column, an arc-shaped baffle that presses against the ratchet is fixedly connected to the end of the sector plate, a second sliding groove is provided on the sector plate, a second connecting plate is fixedly connected to the first connecting plate, a third sliding groove is provided at the end of the second connecting plate, a rotating plate is slidably engaged on the third sliding groove, one end of the rotating plate is rotatably connected to the movable rod, and the other end of the rotating plate is slidably engaged with the second sliding groove.

[0015] Preferably, the connecting assembly includes a first rotating wheel, a threaded rod passing through the first rotating wheel, a limiting slide plate fixedly connected to the inner wall of the first rotating wheel and slidingly engaging with a groove on the threaded rod, a second rotating wheel fixedly connected to the fixed column, a conveyor belt rotatably engaging between the first rotating wheel and the second rotating wheel, a first connecting cylinder fixedly connected to the first rotating wheel, and a second connecting cylinder rotatably connected to the first connecting cylinder fixedly connected to the movable block.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention adjusts the up and down movement of the stage and the vessel by reciprocating the adjustment rod, and at the same time drives the stage and the vessel to reciprocate. On the one hand, raising and lowering the height makes it convenient for the operator to add the mixing indicator according to personal habits, and on the other hand, it helps to mix the added material thoroughly and quickly. This method is easy to operate.

[0018] 2. When the adjusting rod moves, the connecting line retracts, causing the second connecting tube to move and fit against the inner wall of the vessel opening, creating space to facilitate placing the dropper in the middle of the vessel opening and preventing dripping. At the same time, under the action of the limiting frame plate, the pressing column, and the two pressing plates, the retraction distance of the connecting line is guaranteed, ensuring that the second connecting tube is tightly pressed against the inner wall of the vessel opening.

[0019] 3. When switching the platform up or down, simply rotate the adjusting rod to the other side of the second connecting plate, and the arc-shaped baffle will automatically switch to ensure that the gear continues to rotate in the other direction. This operation method is simple and convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram showing the overall structure of the present invention broken down;

[0022] Figure 3 for Figure 2 Schematic diagram of partial structural breakdown in the middle;

[0023] Figure 4 for Figure 3 Enlarged view of the top structure;

[0024] Figure 5 for Figure 4 Schematic diagram of partial structural breakdown in the middle;

[0025] Figure 6 for Figure 3 Schematic diagram of the cross-section of the middle and bottom structure;

[0026] Figure 7 for Figure 6 Diagram of the structural breakdown;

[0027] Figure 8 for Figure 7 Schematic diagram of partial structural breakdown in the middle;

[0028] Figure 9 for Figure 8 A cross-sectional schematic diagram of the threaded rod and its connecting parts;

[0029] Figure 10 for Figure 8 Schematic diagram of a local structure in the middle;

[0030] Figure 11 for Figure 10 A schematic diagram of the mid-structure viewed from below;

[0031] Figure 12 for Figure 10 Diagram of the structural breakdown;

[0032] Figure 13 for Figure 12 Schematic diagram of a local structure in the middle;

[0033] Figure 14 for Figure 13 Diagram of the structural breakdown;

[0034] Figure 15 for Figure 14 A schematic diagram of the central part of the structure viewed from below.

[0035] In the diagram: 1-Main body; 2-First connecting pipe; 3-Second connecting pipe; 4-Platform; 5-Gear; 6-Moving component; 7-Moving block; 8-Rotating disk; 9-First sliding groove; 10-Threaded rod; 11-Rotating rod; 12-Connecting line; 13-Limiting ring; 14-Matching component; 15-Limiting disk; 16-Groove; 17-First fixing plate; 18-Pressure plate; 19-First compression spring; 20-Second fixing plate; 21-Pressure component; 22-Pressure disk; 23-Second compression spring; 24-Moving plate; 25-Limiting frame plate; 26-Pressure column; 27- 28-Moving component; 29-Fixing post; 30-Adjusting rod; 31-First connecting rod; 32-Connecting plate; 33-Ratchet; 34-Maintaining component; 35-Second connecting rod; 36-Moving rod; 37-Tension spring; 38-Switching component; 39-Sector plate; 40-Arc-shaped baffle; 41-Second sliding groove; 42-Second connecting plate; 43-Third sliding groove; 44-Rotating plate; 45-Connecting component; 46-First rotating wheel; 47-Second rotating wheel; 48-Conveyor belt; 49-First connecting cylinder; 50-Second connecting cylinder; 51-Limiting slide plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figures 1-3 The soil heavy metal detector shown in the figure includes a body 1, with a first connecting pipe 2 and a second connecting pipe 3 having plastic properties connected to the body 1; it also includes a stage 4 that moves in conjunction with the body 1, with a gear 5 fixedly connected to the bottom of the stage 4; a moving component 6, which moves the stage 4 to facilitate the addition of liquid; a movable component 27, which works with the moving component 6 and, through the gear 5, causes a container on the stage 4 to swing back and forth; and a switching component 38, which works with the moving component 6 to ensure that the gear 5 always rotates in one direction.

[0039] Please see Figures 3-4 and Figures 6-7The movable component 6 shown in the figure includes a movable block 7 that rotates with the platform 4 and a rotating disk 8 that rotates within the body 1. The body 1 has a first sliding groove 9 that slides with the movable block 7. A threaded rod 10 that is threaded with the movable block 7 rotates within the first sliding groove 9. A rotating rod 11 is fixedly connected to the top of the threaded rod 10. A fitting component 14 is provided on the rotating rod 11. The rotating rod 11 causes the rotating disk 8 to rotate through the fitting component 14. A connecting line 12 that passes through the body 1 is movably fitted on the rotating disk 8. A limiting ring 13 that is sleeved with the second connecting pipe 3 is attached to the end of the connecting line 12.

[0040] Please see Figures 4-5 The mating component 14 shown in the figure includes multiple limiting discs 15 that are fixed to the outer edge of the rotating disk 8. A slot 16 is opened in the middle of the rotating disk 8. A first fixing plate 17 is fixedly connected in the slot 16. A pressure plate 18 is provided on both sides of the first fixing plate 17. A first compression spring 19 is connected between the pressure plate 18 and the first fixing plate 17. A second fixing plate 20 is fixedly connected to the rotating rod 11 and presses against the pressure plate 18. A pressure component 21 is provided in the machine body 1 to retract the connecting line 12 by mating with the limiting discs 15.

[0041] Please see Figures 4-5 The pressure assembly 21 shown in the figure includes a pressure plate 22 that slides within the body 1. The pressure plate 22 is in pressure engagement with the rotating disk 8. A second compression spring 23 is connected between the body 1 and the pressure plate 22. A movable plate 24 is rotatably connected to one of the pressure plates 22 via a first torsion spring. A limiting frame plate 25 that slides within the body 1 is fixedly connected to the body 1 and is in sliding engagement with the end of the movable plate 24. A pressure column 26 that engages with the connecting line 12 and the movable plate 24 is fixedly connected within the body 1. The connecting line 12 is rotatably connected to the central axis of the other pressure plate 22.

[0042] Please see Figure 8 and Figures 10-12 The movable component 27 shown in the figure includes a fixed column 28 that is simultaneously connected and fixed to the platform 4 and rotatably connected to the gear 5. An adjusting rod 29 is rotatably connected to the fixed column 28. A first connecting rod 30 is rotatably connected between the adjusting rod 29 and the platform 4. A connecting plate 31 is fixedly connected to the bottom of the adjusting rod 29. Both ends of the connecting plate 31 are rotatably connected to ratchet teeth 32 that mesh with the gear 5 through a second torsion spring. A retaining component 33 is provided at the bottom of the connecting plate 31. A connecting component 45 is provided between the fixed column 28 and the threaded rod 10.

[0043] Please see Figures 13-15The switching component 38 shown in the figure includes a sector plate 39 rotatably connected to the fixed column 28. An arc-shaped baffle 40 that abuts against the ratchet 32 ​​is fixedly connected to the end of the sector plate 39. A second sliding groove 41 is provided on the sector plate 39. A second connecting plate 42 is fixedly connected to the first connecting plate 34. A third sliding groove 43 is provided at the end of the second connecting plate 42. A rotating plate 44 is slidably engaged on the third sliding groove 43. One end of the rotating plate 44 is rotatably connected to the movable rod 36, and the other end of the rotating plate 44 is slidably engaged with the second sliding groove 41.

[0044] In this embodiment, the container is placed on the platform, and the second connecting tube 3 is manually inserted into the container. Then the machine body 1 is started, and the machine body 1 draws the liquid to be tested into the first connecting tube through the rubber tube for reaction, and then into the second connecting tube. The liquid enters the container. When it is necessary to add the amount of mixed indicator;

[0045] The working principle of the lowering vessel and the reciprocating shaking of the vessel is as follows: The reciprocating adjusting rod 29 (which remains within one side of the second connecting plate 42 and continuously reciprocates within that side, without rotating into the other side of the second connecting plate 42) drives the connecting plate 31 to reciprocate. Under the action of the second torsion spring, the ratchet 32 ​​engages with the gear 5. One end of the ratchet 32 ​​slides with the gear 5 (this side does not drive the gear 5 to rotate, while the other side presses against the gear 5, thus driving the gear 5 to rotate), thereby causing the gear 5 to rotate in the same direction. The gear 5 rotating in the same direction drives the fixed column 28 to rotate in the same direction. Then, through the connecting assembly 45, the threaded rod 10 rotates, thereby causing the movable block 7 to move along the first sliding groove 9, thereby causing the platform 4 to move downward. One of the ratchet 32 ​​is always in contact with the arc-shaped baffle 40 (the position of the arc-shaped baffle 40 is far away from the position of the inclined adjusting rod 29).

[0046] Furthermore, while the reciprocating adjustment rod 29 is in motion, the first connecting rod 30 reciprocates at a certain angle around the fixed column 28, thereby causing the stage 4 to reciprocate at a certain angle around the fixed column 28, which facilitates the thorough mixing of the dripped mixing indicator.

[0047] The working principle of the second connecting tube 3 moving closer to the inner wall of the vessel opening: When the reciprocating adjusting rod 29 moves, it drives the threaded rod 10 to rotate, thereby driving the rotating rod 11 and the second fixed plate 20 to rotate. The rotating second fixed plate 20 presses against the pressure plate 18 located in the slot 16, causing the pressure plate 18 to rotate. The first compression spring 19 is compressed, thereby causing the first fixed plate 17, the rotating disk 8, and the limiting disk 15 to rotate. The multiple rotating limiting disks 15 cause the pressure disk 22 to move away. The second compression spring 23 is compressed, causing the inclined movable plate 24 to move along the inclined limiting frame plate 25. The movable plate 24 rotates adaptively, thereby causing the connecting line 12 to tighten under the action of the pressure column 26, and through the limiting ring 13, it drives the second connecting tube 3 closer to the inner wall of the vessel opening, thereby facilitating the dripping of the mixing indicator.

[0048] Another pressure plate 22 also moves away from the limit plate 15 and drives the connecting line 12 to move, effectively ensuring the movement distance of the second connecting tube 3 and ensuring that the outer wall of the second connecting tube 3 is in contact with the inner wall edge of the vessel opening.

[0049] When the adjusting rod 29 stops moving, under the action of the second compression spring 23, the pressure plate 22 resets and moves between the two adjacent limit plates 15. At the same time, under the action of the first compression spring 19 and the pressure plate 18, the second fixed plate 20 and the rotating plate 8 rotate adaptively, thereby loosening the connecting line 12 and resetting the second connecting tube 3 with plastic properties. The opening of the second connecting tube 3 is now located in the middle of the vessel.

[0050] The automatic switching principle of the arc-shaped baffle 40 and the adjusting rod 29 being positioned far apart is as follows: After the adjusting rod 29 has completed its movement within one side of the second connecting plate 42, it rotates at a large angle to the other side of the second connecting plate 42. Under the action of the second connecting plate 42, which remains unchanged relative to the movable block 7, the middle part of the rotating plate 44 slides and rotates along the third sliding groove 43, thereby causing the other end of the rotating plate 44 to drive the fan-shaped plate 39 to rotate around the fixed column 28 as the rotation center, switching to the other side. When the rotating plate 44 drives the fan-shaped plate 39 to rotate, the end of the rotating plate 44 slides in the second sliding groove 41. This is similar to the practical method of measuring nitrogen content (there are various methods for detecting heavy metals, please refer to the nitrogen analyzer); the experimental method of the nitrogen analyzer can be seen in the video introduction (website address: https: / / www.bilibili.com / video / av24795367 / ).

[0051] Example 2

[0052] Please see Figures 14-15The maintaining component 33 shown in the figure includes a first connecting plate 34 that is fixedly connected to the movable block 7, a second connecting rod 35 that is fixedly connected to the middle of the connecting plate 31, a movable rod 36 that is fixedly connected to the second connecting rod 35, and a tension spring 37 that is rotatably connected to the first connecting plate 34 is attached to the end of the movable rod 36.

[0053] In this embodiment, when the position of the adjusting rod 29 is rotated by force (i.e., rotated from one side of the second connecting plate 42 to the other side), the second connecting rod 35 and the movable rod 36 rotate around the fixed rod as the rotation center, and the tilt direction of the tension spring 37 rotates from one side to the other side. Through the pulling force of the tension spring 37, the adjusting rod 29 is always located on one side of the second connecting plate 42.

[0054] Example 3

[0055] Please see Figures 7-9 The connecting assembly 45 shown in the figure includes a first rotating wheel 46, a threaded rod 10 passing through the first rotating wheel 46, a limiting slide plate 51 fixedly connected to the inner wall of the first rotating wheel 46 and slidingly engaging with the slide groove on the threaded rod 10, a second rotating wheel 47 fixedly connected to the fixed column 28, a conveyor belt 48 rotatably engaging between the first rotating wheel 46 and the second rotating wheel 47, a first connecting cylinder 49 fixedly connected to the first rotating wheel 46, and a second connecting cylinder 50 rotatably connected to the first connecting cylinder 49 fixedly connected to the movable block 7.

[0056] In this embodiment, when the fixed column 28 rotates in the same direction, it drives the second rotating wheel 47 to rotate, and the first rotating wheel 46 rotates through the belt. The first rotating wheel 46 rotates through the cooperation of the limiting slide plate 51 and the slide groove (without affecting the sliding of the first rotating wheel 46 on the threaded rod 10), causing the threaded rod 10 to rotate. The rotating threaded rod 10 causes the movable block 7 to move along the first sliding groove 9. Then, through the first connecting cylinder 49 and the second connecting cylinder 50, the first rotating wheel 46 moves up and down along the threaded rod 10, thereby realizing the up and down movement of the platform 4. The lifting and lowering of the platform 4 facilitates the dripping of the mixed indicator. The diameter of the second rotating wheel 47 is larger than the diameter of the first rotating wheel 46, thereby ensuring the rotation speed of the threaded rod 10 and ensuring the effect of the limiting plate 15 on the pressing plate 22.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil heavy metal detector, comprising: a machine body (1) having a first connecting pipe (2) and a second connecting pipe (3) with plasticity connected thereto; characterized in that it further comprises: a carrier table (4) movably connected to the machine body (1), the carrier table (4) being fixedly connected at the bottom with a gear (5); a moving assembly (6) for moving the carrier table (4) to facilitate dropwise adding of liquid; a movable assembly (27) cooperating with the moving assembly (6) and making the vessel on the carrier table (4) swing back and forth through the gear (5); a switching assembly (38) cooperating with the moving assembly (6) to make the gear (5) always rotate in one direction.

2. The soil heavy metal detector according to claim 1, characterized in that: The moving assembly (6) comprises a movable block (7) movably connected to the carrier table (4) and a rotating disc (8) rotating in the machine body (1), the machine body (1) being provided with a first sliding groove (9) slidably connected to the movable block (7), the first sliding groove (9) being provided with a threaded rod (10) threadedly connected to the movable block (7) and rotating therein, the threaded rod (10) being fixedly connected at the top with a self-rotating rod (11), the self-rotating rod (11) being provided with a cooperating assembly (14) to make the rotating disc (8) rotate, the rotating disc (8) being movably connected with a connecting line (12) extending out of the machine body (1), the connecting line (12) being provided at the end with a limiting ring (13) sleeved with the second connecting pipe (3).

3. A soil heavy metal detector according to claim 2, wherein: The cooperating assembly (14) comprises a plurality of limiting discs (15) fixedly connected to the outer edge of the rotating disc (8), the rotating disc (8) being provided in the middle with a notch (16), the notch (16) being fixedly connected with a first fixed plate (17), the first fixed plate (17) being provided at both sides with abutting plates (18), the abutting plates (18) and the first fixed plate (17) being hung and cooperated with a first compression spring (19), the self-rotating rod (11) being fixedly connected with a second fixed plate (20) abuttingly cooperating with the abutting plates (18), the machine body (1) being provided with an abutting assembly (21) cooperating with the limiting discs (15) to make the connecting line (12) contract.

4. The soil heavy metal detector of claim 2, wherein: The abutting assembly (21) comprises an abutting disc (22) slidably connected in the machine body (1), the abutting disc (22) abuttingly cooperating with the rotating disc (8), the machine body (1) and the abutting disc (22) being hung and cooperated with a second compression spring (23), one of the abutting discs (22) being rotatably connected with an abutting plate (24) through a first torsion spring, the machine body (1) being fixedly connected with a limiting frame plate (25) slidably cooperating with the end of the abutting plate (24), the machine body (1) being fixedly connected with an abutting column (26) cooperating with the connecting line (12) and the abutting plate (24), the connecting line (12) being rotatably connected with the central shaft of the other abutting disc (22).

5. The soil heavy metal detector of claim 2, wherein: The movable component (27) comprises a fixed column (28) fixedly connected with the object table (4) and rotatably connected with the gear (5), an adjusting rod (29) rotatably connected with the fixed column (28), a first connecting rod (30) rotatably connected between the adjusting rod (29) and the object table (4), a connecting plate (31) fixedly connected to the bottom of the adjusting rod (29), ratchet teeth (32) rotatably connected with the gear (5) at both ends of the connecting plate (31) through a second torsion spring, a maintaining component (33) arranged at the bottom of the connecting plate (31), and a connecting component (45) arranged between the fixed column (28) and the threaded rod (10).

6. The soil heavy metal detector of claim 2, wherein: The maintaining component (33) comprises a first connecting plate (34) fixedly connected with the movable block (7), a second connecting rod (35) fixedly connected to the middle of the connecting plate (31), an activity rod (36) fixedly connected to the second connecting rod (35), and a tension spring (37) rotatably connected with the first connecting plate (34) and hung at the end of the activity rod (36).

7. A soil heavy metal detector according to claim 6, characterised in that: The switching component (38) comprises a sector plate (39) rotatably connected with the fixed column (28), an arc-shaped baffle (40) fixedly connected with the sector plate (39) and abuttingly matched with the ratchet teeth (32), a second sliding groove (41) formed in the sector plate (39), a second connecting plate (42) fixedly connected to the first connecting plate (34), a third sliding groove (43) formed at the end of the second connecting plate (42), a rotating plate (44) slidably matched with the third sliding groove (43), one end of the rotating plate (44) rotatably connected with the activity rod (36), and the other end of the rotating plate (44) slidably matched with the second sliding groove (41).

8. The soil heavy metal detector of claim 5, wherein: The connecting component (45) comprises a first rotating wheel (46), the threaded rod (10) penetrates through the first rotating wheel (46), a limiting sliding plate (51) fixedly connected with the inner wall of the first rotating wheel (46) and slidably matched with the sliding groove on the threaded rod (10), a second rotating wheel (47) fixedly connected with the fixed column (28), a transmission belt (48) rotatably matched between the first rotating wheel (46) and the second rotating wheel (47), a first connecting cylinder (49) fixedly connected to the first rotating wheel (46), and a second connecting cylinder (50) fixedly connected with the first connecting cylinder (49) and rotatably connected with the movable block (7).

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