An agricultural soil pH detection device and method thereof

Abstract

The present invention belongs to the technical field of soil detection, and relates to a soil pH detection device and method for agricultural use. The detection device in the present invention includes a sampling rod, and a plurality of sampling holes are arranged at intervals from top to bottom on the sampling rod. A sampling mechanism and a detection mechanism are provided at each corresponding position of the sampling holes in the sampling rod; the sampling mechanism includes a sliding block, an outer cylinder and an inner cylinder. The sliding block is horizontally movably arranged in the sampling rod. The sliding block is rotatably connected with a connecting ring, the outer cylinder is rotatably connected with the connecting ring, and the inner cylinder is slidably sleeved in the outer cylinder. A spraying plate sprays water into the inner cylinder. As the inner cylinder moves downward, the muddy water in the inner cylinder flows out through the water permeable holes and falls into the detection disk, making the soil sample mix more evenly with the water, which is beneficial to improving the detection accuracy. The spraying plate and the side spraying ports can comprehensively wash the inner cylinder and can also wash the detection disk to ensure the accuracy of the detection result during the next use.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil detection and relates to an agricultural soil pH detection device and method. Background Art

[0002] Soil detection is the basis for implementing precision agriculture. By accurately understanding the soil conditions of each piece of land, differential fertilization, irrigation and other management measures can be implemented to improve agricultural production efficiency, which provides an important basis for scientific management and improvement of agricultural productivity. Soil pH not only directly affects the growth and yield of crops, but also indirectly affects crop growth by influencing soil fertility, microbial activity and physical structure. Therefore, detecting soil pH is an important link in agricultural production.

[0003] In the patent document with the publication number CN116929836A, a soil acid-base detection device for landscaping projects is disclosed, including a fixed bracket. One side above the fixed bracket is installed with an oil cylinder, the output end of the oil cylinder is connected with a sampling insertion tube, the top of the fixed bracket is installed with a water storage tank, the top of the water storage tank is inlaid and installed with a display screen, a rectangular through groove is arranged on the surface of the sampling insertion tube, and a number of sampling frames arranged up and down are installed through the rectangular through groove on the surface of the sampling insertion tube. The bottom wall of each sampling frame is installed with a detection probe. This device can realize the acid-base detection of soils at different depths at the same sampling point and can avoid the problem of mixing of residual samples caused by single-round detection.

[0004] However, the following problems exist in the actual use process of this device: If the sampling frame is cracked during the sampling process, when water is injected into the sampling frame, the water in the sampling frame flows out, affecting the soil detection result. And directly injecting water into the sampling frame makes the sample and water mix unevenly, affecting the detection accuracy. In addition, during sampling, the sampling frame deflects, causing a part of the top opening of the sampling frame to gradually extend into the adjacent soil. When the sampling frame is reset, the corresponding soil sample is brought back into the sampling insertion tube. Since the outward extending part of the upper end of the sampling frame is limited, there may be a situation of insufficient sampling volume, affecting the detection effect.

[0005] To solve the above problems, the present invention proposes an agricultural soil pH detection device and method. Summary of the Invention

[0006] To solve the problems in the background art, the present invention proposes an agricultural soil pH detection device and method.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] An agricultural soil pH detection device, including a sampling rod, the sampling rod is provided with a plurality of sampling holes spaced apart from top to bottom, and a sampling mechanism and a detection mechanism are provided at corresponding positions of each sampling hole in the sampling rod; the sampling mechanism includes a sliding block, an outer cylinder and an inner cylinder, the sliding block is horizontally movably arranged in the sampling rod, the sliding block is rotatably connected with a connecting ring, the outer cylinder is rotatably connected with the connecting ring, and the inner cylinder is slidably sleeved in the outer cylinder; water permeable holes are arranged on the side wall of the inner cylinder; a driving component for driving the sliding block to move is arranged in the sampling rod.

[0009] The detection mechanism includes a detection disk, a spraying plate and a detector installed on the bottom wall of the detection disk, which are arranged below the sampling mechanism; the spraying plate is installed on the detection disk, the spraying plate cooperates with the outer cylinder, a water inlet channel communicated with the spraying plate and a drainage channel communicated with the detection disk are arranged in the sampling rod; after sampling is completed, the connecting ring is rotated, then the inner cylinder is moved downward and sleeved on the spraying plate, water is injected into the spraying plate, and the muddy water in the inner cylinder falls into the detection disk through the water permeable holes.

[0010] Further, side spraying ports are arranged on the detection disk, a water spraying channel is opened on the side wall of the detection disk, the water spraying channel is communicated with the water inlet channel, and the side spraying ports are communicated with the water spraying channel; the side spraying ports spray water onto the outer wall of the inner cylinder.

[0011] Further, the bottom wall of the detection disk is recessed towards the middle.

[0012] Further, a limiting rod is fixed on the outer cylinder, a spiral groove is opened on the inner wall of the sampling hole, and the limiting rod cooperates with the spiral groove; when the limiting rod moves into the spiral groove, the outer cylinder rotates under the guiding action of the spiral groove.

[0013] Further, a baffle is arranged at each sampling hole and is movably arranged up and down, and the baffle is connected with the sliding block through a connecting rod.

[0014] Further, the driving component includes a lead screw, a rotating rod and a first motor, the first motor is fixedly installed on the sampling rod, the rotating rod is vertically rotatably installed in the sampling rod, and the first motor is drivingly connected with the rotating rod, the lead screw is horizontally rotatably installed in the sampling rod, a second bevel gear is coaxially fixed on the lead screw, the second bevel gear meshes with a first bevel gear, and the first bevel gear is coaxially fixed on the rotating rod; the sliding block is in transmission connection with the lead screw.

[0015] Further, a ball is arranged between the sliding block and the lead screw, and the sliding block, the lead screw and the ball form a ball screw pair.

[0016] Further, the water inlet channel includes an inner pipe and a water supply pipe; the inner pipe is vertically arranged in the sampling rod, each spray plate is communicated with a water supply pipe, and the water supply pipe is communicated with the inner pipe; the drainage channel includes a drain pipe and an outer pipe, the outer pipe is arranged in the sampling rod, each of the detection discs is provided with a leakage hole communicated with the drain pipe, a first solenoid valve is installed in the leakage hole, and the drain pipe is communicated with the outer pipe; the inner pipe is connected to the water outlet end of the water pump.

[0017] Further, the inner pipe is arranged inside the outer pipe, and the water supply pipe is arranged inside the drain pipe.

[0018] A method for detecting the soil acidity and alkalinity for agricultural use in the present invention includes the following steps

[0019] S1. Insert the sampling rod into the ground;

[0020] S2. Through the driving assembly, move the sliding block outwards from the sampling hole, insert the outer cylinder into the soil, rotate the outer cylinder relative to the connecting ring, and separate the soil sample in the inner cylinder from the land; then move the outer cylinder back into the sampling rod;

[0021] S3. Rotate the connecting ring, make the inner cylinder vertically downward and directly above the spray plate, then move the inner cylinder downward and sleeved on the spray plate, convey water into the spray plate through the water inlet channel. As the inner cylinder moves downward, the muddy water in the inner cylinder falls into the detection disc through the water permeable holes, and the detector conducts detection;

[0022] S4. After the detection is completed, move the sampling rod to the ground, convey water into the spray plate, and move the inner cylinder up and down reciprocally along the outer cylinder to wash the inner cylinder, and the muddy water in the detection disc is discharged through the drainage channel.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The spray plate sprays water into the inner cylinder. As the inner cylinder moves downward, the muddy water in the inner cylinder flows out through the water permeable holes and falls into the detection disc, making the mixing of the soil sample and water more uniform, which is beneficial to improving the detection accuracy. At the same time, the side spray ports spray towards the outer wall of the inner cylinder, avoiding the adhesion of soil on the outer wall of the inner cylinder, which is beneficial to improving the detection accuracy.

[0025] 2. After the outer cylinder is inserted into the soil, the outer cylinder rotates relative to the connecting ring, separating the soil sample in the outer cylinder from the land, which is beneficial to obtaining a sufficient amount of samples in the inner cylinder and avoiding the influence of insufficient samples on the detection results.

[0026] 3. The spray plate and the side spray ports can comprehensively wash the inner cylinder and can also wash the detection disc to ensure the accuracy of the detection results during the next use. Description of the Drawings

[0027] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the internal structure of the sampling rod in the present invention;

[0029] Figure 3 It is in the present invention Figure 2 Enlarged view of part A;

[0030] Figure 4 It is a schematic diagram of the structure of the rotating block in the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the outer cylinder in the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the connecting ring in the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the inner cylinder in the present invention;

[0034] Figure 8 It is a cross-sectional view of the sampling rod in the present invention;

[0035] Figure 9 It is in the present invention Figure 8 Enlarged view of part B;

[0036] Figure 10 It is in the present invention Figure 9 Enlarged view of part C;

[0037] Figure 11 It is a cross-sectional view of the detection disc in the present invention.

[0038] In the figure: 1. Fixed box; 2. Display; 3. Pressure push rod; 4. Sampling rod; 5. First motor; 6. Rotating rod; 7. First bevel gear; 8. Second bevel gear; 9. Lead screw; 10. Sliding block; 11. Connecting rod; 12. Sampling hole; 13. Slide rail; 14. Baffle; 15. Rotating block; 16. Connecting ring; 17. Outer cylinder; 18. Electric telescopic rod; 19. Inner cylinder; 20. Limiting rod; 21. Spiral groove; 22. Outer tube; 23. Inner tube; 24. Drain pipe; 25. Water supply pipe; 26. Detection disc; 27. Water spraying channel; 28. Side spraying port; 29. Leak hole; 30. Spraying plate; 31. Detector; 32. Second motor. Detailed implementation manners

[0039] 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. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] As Figures 1 - 11 shown, the technical solution adopted by the present invention is as follows: An agricultural soil pH detection device includes a fixed box 1, a sampling rod 4, a sampling mechanism and a detection mechanism. A display 2 and operation buttons are provided on the fixed box 1. A water tank is provided inside the fixed box 1, a water pump is installed on the water tank, and water is contained in the water tank.

[0041] One side of the fixed box 1 is fixedly connected with a fixing plate, a pressure push rod 3 is installed on the fixing plate, and the output end of the pressure push rod 3 is arranged vertically downward and fixedly connected with the sampling rod 4. The sampling rod 4 is arranged vertically and the lower end is conical.

[0042] The inside of the sampling rod 4 is hollow, and a plurality of sampling holes 12 are arranged at intervals from top to bottom on the side wall of the sampling rod 4. A baffle 14 is provided at each sampling hole 12. Specifically, a slide rail 13 is fixedly connected inside the sampling rod 4, and the baffle 14 is slidably connected up and down with the slide rail 13.

[0043] There are a plurality of sampling mechanisms, and the plurality of sampling mechanisms correspond to the plurality of sampling holes 12 one by one. Each sampling mechanism includes a sliding block 10, an outer cylinder 17 and an inner cylinder 19. The sliding block 10 is horizontally movably arranged inside the sampling rod 4. A driving component for driving the horizontal movement of the sampling rod 4 is arranged inside the sampling rod 4. The driving component includes a lead screw 9, a rotating rod 6 and a first motor 5. The first motor 5 is fixedly installed on the sampling rod 4, the rotating rod 6 is vertically rotatably installed inside the sampling rod 4, and the first motor 5 is drivingly connected with the rotating rod 6. A mounting plate is fixed inside the sampling rod 4, the lead screw 9 is horizontally rotatably installed on the mounting plate. A second bevel gear 8 is coaxially fixed on the lead screw 9, the second bevel gear 8 meshes with a first bevel gear 7, and the first bevel gear 7 is coaxially fixed on the rotating rod 6. The sliding block 10 is in transmission connection with the lead screw 9, and when the lead screw 9 rotates, the sliding block 10 moves horizontally. In this embodiment, a ball is arranged between the lead screw 9 and the sliding block 10, and the lead screw 9, the sliding block 10 and the ball form a ball screw pair.

[0044] A connecting rod 11 is connected between the sliding block 10 and the baffle 14. One end of the connecting rod 11 is hinged to the sliding block 10, and the other end of the connecting rod 11 is hinged to the baffle 14.

[0045] As Figure 4 shown, rotating blocks 15 are rotatably arranged on both sides of the sliding block 10, a second motor 32 is fixedly installed on one side of the sliding block 10, and the second motor 32 is drivingly connected with one of the rotating blocks 15. A connecting ring 16 is fixedly installed between the two rotating blocks 15. The axis of the second motor 32 is perpendicular to the axis of the connecting ring 16.

[0046] As Figure 5 , Figure 6As shown, the outer cylinder 17 is coaxially rotatably mounted on the connecting ring 16, and there is rotational damping between the outer cylinder 17 and the connecting ring 16. That is to say, the outer cylinder 17 will rotate relative to the connecting ring 16 only when it is driven. The inner cylinder 19 is slidably arranged in the outer cylinder 17, and the outer cylinder 17 is fixedly connected with an electric telescopic rod 18, the output end of the electric telescopic rod 18 is fixedly connected to the inner cylinder 19, and the electric telescopic rod 18 extends into the connecting ring 16. The electric telescopic rod 18 drives the inner cylinder 19 to slide in the outer cylinder 17. Initially, the openings of the outer cylinder 17 and the inner cylinder 19 are both facing the corresponding sampling holes 12, and the outer cylinder 17 and the inner cylinder 19 are moved to the outside of the sampling rod 4 through the sampling holes 12 for sampling. A plurality of water-permeable holes are provided on the side walls of the inner cylinder 19 except the side wall opposite to the opening.

[0047] The outer cylinder 17 is fixedly connected with a limiting rod 20, and the end of the limiting rod 20 facing away from the outer cylinder 17 is in an arc shape. A spiral groove 21 is provided on the inner wall of the sampling hole 12, and one end of the spiral groove 21 penetrates the inner wall of the sampling rod 4 in the direction close to the inside of the sampling rod 4. The limiting rod 20 and the spiral groove 21 are arranged in coordination. In this way, as the outer cylinder 17 moves outward, the limiting rod 20 gradually enters the spiral groove 21. Afterwards, under the guidance of the spiral groove 21, the outer cylinder 17 rotates relative to the connecting ring 16. The limiting rod 20 should be arranged away from the open end of the outer cylinder 17, so that when the outer cylinder 17 is inserted into the soil for a certain distance, the limiting rod 20 enters the spiral groove 21, and the outer cylinder 17 rotates relative to the connecting ring 16, so that the soil sample in the inner cylinder 19 is separated from the soil.

[0048] There are multiple detection mechanisms, and the multiple detection mechanisms correspond to the multiple sampling mechanisms one by one. Each detection mechanism is located below the corresponding sampling mechanism. Each detection mechanism includes a detection disk 26, a spray plate 30 and a detector 31. The detection disk 26 is fixedly installed in the sampling rod 4, and the detector 31 is arranged on the bottom wall of the detection disk 26. The spray plate 30 is fixedly arranged above the middle part of the detection disk 26, and a plurality of spray holes are opened on the upper end surface of the spray plate 30. The spray plate 30 is adapted to the inner cylinder 19. After the sampling is completed, the rotating block 15 is rotated downward by 90 degrees, so that the openings of the outer cylinder 17 and the inner cylinder 19 are downward, and then the inner cylinder 19 is moved downward, and then the inner cylinder 19 is sleeved on the spray plate 30. The detector 31 is used to detect the pH value of the soil. The detector 31 is a prior art and is not described here.

[0049] The sampling rod 4 is provided with a water inlet channel communicating with the spray plate 30 and a water discharge channel communicating with the detection disk 26 .

[0050] The spraying plate 30 is provided with a water cavity. The spray holes are communicated with the water cavity, the water cavity is communicated with the water inlet channel, and the water inlet channel is connected to the water outlet end of the water pump in the fixed box 1. The water in the water tank enters the spraying plate 30 through the water inlet channel. The spraying plate 30 sprays the water into the inner cylinder 19 through the spray holes. As the inner cylinder 19 moves downward, the muddy water in the inner cylinder 19 flows out through the water permeable holes and falls into the detection disk 26.

[0051] The water inlet channel includes an inner pipe 23 and a water supply pipe 25. The inner pipe 23 is vertically and fixedly arranged in the sampling rod 4, and the inner pipe 23 is communicated with the water outlet end of the water pump. The lower end of each spraying plate 30 is fixedly connected with a water supply pipe 25. One end of the water supply pipe 25 is communicated with the water cavity of the spraying plate 30, and the other end of the water supply pipe 25 is communicated with the inner pipe 23. As Figure 10 shown, the water supply pipe 25 passes through the middle of the detection disk 26, and the water supply pipe 25 is hermetically connected to the detection disk 26.

[0052] A water spraying channel 27 is opened on the side wall of the detection disk 26, and a water passing port communicated with the water spraying channel 27 is opened on the water supply pipe 25. A side spraying port 28 is opened at the upper end of the detection disk 26, and the side spraying port 28 is communicated with the water spraying channel 27. Specifically, an inclined surface is arranged at the upper end of the detection disk 26. The lower end of the inclined surface inclines towards the axis direction of the detection disk 26, and the side spraying port 28 is opened on the inclined surface. When the inner cylinder 19 moves downward along the spraying plate 30, the side spraying port 28 sprays water obliquely upward and sprays onto the outer side wall of the inner cylinder 19.

[0053] After the detection is completed, the muddy water in the detection disk 26 is discharged through the drainage channel. The drainage channel includes an outer pipe 22 and a drainage pipe 24. The outer pipe 22 is vertically arranged in the sampling rod 4, and a second electromagnetic valve is installed at the lower end of the outer pipe 22. Each detection disk 26 is connected with a drainage pipe 24, and the drainage pipe 24 is communicated with the outer pipe 22. A plurality of leakage holes 29 are opened at the bottom of the detection disk 26, and the leakage holes 29 are communicated with the drainage pipe 24. A first electromagnetic valve is installed in each leakage hole 29. As Figure 10 shown, the bottom wall of the detection disk 26 is recessed towards the middle.

[0054] As Figure 9 shown, in this embodiment, the inner pipe 23 is located inside the outer pipe 22, and the water supply pipe 25 is located inside the drainage pipe 24.

[0055] A controller is arranged on the fixed box 1. The first electromagnetic valve, the second electromagnetic valve, the first motor 5, the detector 31, the second motor 32 and the display 2 are all electrically connected to the controller.

[0056] Working principle: Initially, the baffle 14 blocks the sampling hole 12, and the opening of the outer cylinder 17 faces the corresponding baffle 14. The inner cylinder 19 is located inside the outer cylinder 17. The sliding block 10 is at the end of the thread groove on the lead screw 9 away from the sampling hole 12.

[0057] During use, move the sampling rod 4 to the land to be detected, and insert the sampling rod 4 into the land through the pressure push rod 3.

[0058] Start the first motor 5, the rotating rod 6 rotates, the lead screw 9 rotates, the sliding block 10 moves outward along the lead screw 9, and the rotating block 15, the connecting ring 16 and the outer cylinder 17 move synchronously. The sliding block 10 pushes the baffle 14 through the connecting rod 11 to move the baffle 14 downward along the slide rail 13, and then the sampling hole 12 is gradually opened. After that, the outer cylinder 17 moves through the sampling hole 12 to the outside of the sampling rod 4 and is inserted into the soil. As the outer cylinder 17 moves outward, the limit rod 20 enters the spiral groove 21, and then under the guidance of the spiral groove 21, the outer cylinder 17 rotates relative to the connecting ring 16 while moving outward, so that the soil sample in the inner cylinder 19 is separated from the land.

[0059] When the sliding block 10 moves to the end of the thread groove on the lead screw 9 close to the sampling hole 12, the sliding block 10 moves into the sampling rod 4 along the lead screw 9, and the outer cylinder 17 moves towards the initial state. The sliding block 10 drives the baffle 14 to move upward through the connecting rod 11. When the outer cylinder 17 returns to the sampling rod 4, the baffle 14 gradually covers the sampling hole 12. Until the sliding block 10 returns to the initial position and the outer cylinder 17 returns to the initial state, stop the first motor 5.

[0060] After that, start the second motor 32 to rotate the rotating block 15 by 90 degrees so that the opening of the outer cylinder 17 faces downward. At this time, the inner cylinder 19 is directly above the spraying plate 30. Then start the electric telescopic rod 18 to move the inner cylinder 19 outward of the outer cylinder 17. The inner cylinder 19 gradually approaches the spraying plate 30 and is sleeved on the spraying plate 30. Start the water pump, and the water in the water tank is transported to the spraying plate 30 through the inner pipe 23 and the water supply pipe 25 and sprayed into the inner cylinder 19 through the spray holes. The water entering the inner cylinder 19 is mixed with the soil sample in the inner cylinder 19. As the inner cylinder 19 gradually moves downward, under the extrusion of the spraying plate 30, the muddy water in the inner cylinder 19 flows out through the water permeable holes and falls into the detection tray 26. This makes the mixing of water and soil sample more uniform, thus ensuring the accuracy of the detection result.

[0061] At the same time, the water in the water supply pipe 25 enters the spraying channel 27 and is sprayed out through the side spray nozzles 28. The side spray nozzles 28 spray water onto the outer side wall of the inner cylinder 19 to wash down the soil adhering to the outer side wall of the inner cylinder 19, which is beneficial to improving the detection accuracy. The detector 31 conducts detection and displays the detection result through the display 2, which is convenient for the staff to view.

[0062] After the detection is completed, the sampling rod 4 is moved to the ground by the pressure push rod 3. Then, the first solenoid valve and the second solenoid valve are opened, and the muddy water in the detection disk 26 is discharged through the drain pipe 24 and the outer pipe 22. After that, water is continuously supplied into the inner pipe 23. The water flows into the spray plate 30 through the water supply pipe 25 and flows out through the spray holes. At the same time, the water in the water supply pipe 25 enters the spray channel 27 and is sprayed out through the side spray ports 28. The water sprayed out by the spray plate 30 flushes the inner wall of the inner cylinder 19, and the water sprayed out by the side spray ports 28 flushes the outer side wall of the inner cylinder 19. The inner cylinder 19 is moved up and down reciprocally by the electric telescopic rod 18. The inner cylinder 19 moves up and down along the spray plate 30, and the spray plate 30 scrapes the soil on the inner wall of the inner cylinder 19. At the same time, when the inner cylinder 19 moves down, the pressure inside the inner cylinder 19 increases, so that the water entering the inner cylinder 19 is sprayed out through the water permeable holes, flushing out the soil blocked in the water permeable holes and flushing the water permeable holes.

[0063] After the water on the inner cylinder 19 falls into the detection disk 26, it flows out through the drain pipe 24 and the outer pipe 22. The water falling into the detection disk 26 has the effect of cleaning the detection disk 26. Since the bottom of the detection disk 26 is recessed towards the middle, the muddy water in the detection disk 26 is more likely to flow out, preventing soil from adhering to the detection disk 26 and affecting the detection accuracy of the next time.

[0064] An agricultural soil pH detection method in the present invention includes the following steps:

[0065] S1. Insert the sampling rod 4 into the ground.

[0066] S2. Move the slider 10 outward from the sampling hole 12 through the driving component. The outer cylinder 17 is inserted into the soil. The outer cylinder 17 is rotated relative to the connecting ring 16 to separate the soil sample in the inner cylinder 19 from the land. Then, the outer cylinder 17 is returned into the sampling rod 4.

[0067] S3. Rotate the connecting ring 16 to make the inner cylinder 19 vertically downward and directly above the spray plate 30. Then, move the inner cylinder 19 downward and sleeved on the spray plate 30. Water is supplied into the spray plate 30 through the water inlet channel. As the inner cylinder 19 moves downward, the muddy water in the inner cylinder 19 falls into the detection disk 26 through the water permeable holes, and the detector 31 conducts detection.

[0068] S4. After the detection is completed, move the sampling rod 4 to the ground, supply water into the spray plate 30, and move the inner cylinder 19 up and down reciprocally along the outer cylinder 17 to flush the inner cylinder 19. The muddy water in the detection disk 26 is discharged through the drainage channel.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An agricultural soil pH detection device, comprising a sampling rod (4), wherein a plurality of sampling holes (12) are arranged at intervals from top to bottom on the sampling rod (4), and the device is characterized in that: A sampling mechanism and a detection mechanism are provided at positions corresponding to each sampling hole (12) inside the sampling rod (4); the sampling mechanism includes a sliding block (10), an outer cylinder (17) and an inner cylinder (19), the sliding block (10) is horizontally movably arranged inside the sampling rod (4), rotating blocks (15) are rotatably arranged on both sides of the sliding block (10), a second motor (32) is fixedly installed on one side of the sliding block (10), and the second motor (32) is drivingly connected to one of the rotating blocks (15); a connecting ring (16) is fixedly installed between the two rotating blocks (15), and the axis of the second motor (32) is perpendicular to the axis of the connecting ring (16); the outer cylinder (17) is coaxially rotatably installed on the connecting ring (16); the inner cylinder (19) is slidably sleeved inside the outer cylinder (17); water permeable holes are provided on the side wall of the inner cylinder (19); a driving assembly for driving the sliding block (10) to move is arranged inside the sampling rod (4). The detection mechanism includes a detection disc (26), a spraying plate (30) arranged below the sampling mechanism, and a detector (31) installed on the bottom wall of the detection disc (26); the spraying plate (30) is installed on the detection disc (26), the spraying plate (30) cooperates with the inner cylinder (19), a water inlet channel communicating with the spraying plate (30) and a drainage channel communicating with the detection disc (26) are arranged inside the sampling rod (4); after sampling is completed, the connecting ring (16) is rotated, and then the inner cylinder (19) is moved downward and sleeved on the spraying plate (30), water is injected into the spraying plate (30), and the muddy water inside the inner cylinder (19) falls into the detection disc (26) through the water permeable holes.

2. The agricultural soil pH detection device according to claim 1, characterized in that: Side spraying ports (28) are provided on the detection disc (26), a water spraying channel (27) is opened on the side wall of the detection disc (26), the water spraying channel (27) communicates with the water inlet channel, and the side spraying ports (28) communicate with the water spraying channel (27); the side spraying ports (28) spray water onto the outer wall of the inner cylinder (19).

3. An agricultural soil pH detection device according to claim 1, characterized in that: The bottom wall of the detection disc (26) is recessed towards the middle.

4. An agricultural soil pH detection device according to claim 1, characterized in that: A limiting rod (20) is fixed on the outer cylinder (17), a spiral groove (21) is opened on the inner wall of the sampling hole (12), and the limiting rod (20) cooperates with the spiral groove (21); when the limiting rod (20) moves into the spiral groove (21), under the guiding action of the spiral groove (21), the outer cylinder (17) rotates.

5. The agricultural soil pH detection device according to claim 1, characterized in that: A baffle (14) is vertically movably arranged at each sampling hole (12), and the baffle (14) is connected to the sliding block (10) through a connecting rod (11).

6. The agricultural soil pH detection device according to claim 1, characterized in that: The driving assembly includes a lead screw (9), a rotating rod (6) and a first motor (5), the first motor (5) is fixedly installed on the sampling rod (4), the rotating rod (6) is vertically rotatably installed inside the sampling rod (4), and the first motor (5) is drivingly connected to the rotating rod (6), the lead screw (9) is horizontally rotatably installed inside the sampling rod (4), a second bevel gear (8) is coaxially fixed on the lead screw (9), the second bevel gear (8) meshes with a first bevel gear (7), and the first bevel gear (7) is coaxially fixed on the rotating rod (6); the sliding block (10) is in transmission connection with the lead screw (9).

7. An agricultural soil pH detection device according to claim 6, characterized in that: A ball is arranged between the sliding block (10) and the lead screw (9), and the sliding block (10), the lead screw (9) and the ball form a ball screw pair.

8. The agricultural soil pH detection device according to claim 1, characterized in that: The water inlet channel includes an inner pipe (23) and a water supply pipe (25); the inner pipe (23) is vertically arranged in the sampling rod (4), and each spraying plate (30) is communicated with a water supply pipe (25), and the water supply pipe (25) is communicated with the inner pipe (23); the drainage channel includes a drain pipe (24) and an outer pipe (22), the outer pipe (22) is arranged in the sampling rod (4), each of the detection discs (26) is provided with a leakage hole (29) communicated with the drain pipe (24), a first solenoid valve is installed in the leakage hole (29), and the drain pipe (24) is communicated with the outer pipe (22); the inner pipe (23) is connected to the water outlet end of the water pump.

9. An agricultural soil pH detection device according to claim 8, characterized in that: The inner pipe (23) is arranged inside the outer pipe (22), and the water supply pipe (25) is arranged inside the drain pipe (24).

10. A method for detecting soil pH value for agricultural use, which uses a soil pH value detection device for agricultural use described in claim 1, and is characterized in that: It includes the following steps S1. Insert the sampling rod (4) into the ground. S2. Through the driving assembly, move the sliding block (10) outward from the sampling hole (12), insert the outer cylinder (17) into the soil, rotate the outer cylinder (17) relative to the connecting ring (16), and separate the soil sample in the inner cylinder (19) from the land; then move the outer cylinder (17) back into the sampling rod (4). S3. Rotate the connecting ring (16) to make the inner cylinder (19) vertically downward and directly above the spraying plate (30), then move the inner cylinder (19) downward and sleeved on the spraying plate (30), and convey water into the spraying plate (30) through the water inlet channel. As the inner cylinder (19) moves downward, the muddy water in the inner cylinder (19) falls into the detection disc (26) through the water permeable holes, and the detector (31) conducts detection. S4. After the detection is completed, move the sampling rod (4) to the ground, convey water into the spraying plate (30), and move the inner cylinder (19) up and down reciprocally along the outer cylinder (17) to wash the inner cylinder (19), and the muddy water in the detection disc (26) is discharged through the drainage channel.

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