Soil acidity and alkalinity detection device and detection method

Abstract

The invention discloses a soil acidity and alkalinity detection device and a detection method, and belongs to the technical field of agriculture. Comprising a base, a detection cabinet is arranged on the base, a touch screen is arranged on the detection cabinet, the touch screen is externally connected with a program control unit, and the program control unit comprises a software control system and a hardware driving unit; a screening device is mounted on one side of the detection cabinet, a moving mechanism is mounted in the detection cabinet, a first electric push rod is mounted on the moving mechanism, and a detection probe is mounted at the bottom of the first electric push rod; three calibration devices are arranged at the bottom of the detection probe in a matched mode, and a sample storage box and a cleaning device are arranged on the two sides of each calibration device respectively; the screening device comprises a crushing cylinder, a screening groove, a coarse filter plate, a crushing mechanism, a discharging pipe and a fine filter plate, the crushing cylinder is obliquely mounted on the detection cabinet, the screening groove is formed in the top of the crushing cylinder, the coarse filter plate is mounted at the bottom end of the screening groove, the crushing mechanism and the fine filter plate are mounted in the crushing cylinder, and the calibration device comprises a solution tank and a sealing assembly. The detection accuracy can be improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of agriculture, relates to soil detection, and specifically relates to a soil pH detection device and a detection method. Background Art

[0002] The growth of crops requires a good soil environment. Different crops or the same crops have different requirements for the soil environment at different growth stages. Soil acidity, also known as "soil pH", is an indicator to measure the strength of the soil acid-base reaction. It is mainly determined by the concentration of hydrogen ions and hydroxide ions in the soil. Soil acidity not only affects the growth and development of plants, but also has an important impact on soil fertility and microbial activity. By detecting changes in soil acidity and alkalinity, users can promptly understand changes in the basic conditions of the soil, thereby ensuring that plants grow in a relatively ideal soil environment and achieving the goal of increasing production and income.

[0003] Existing detectors usually insert the probe directly into the soil for detection. Hard clods or stones in the soil can easily damage the probe, so the equipment has a short service life. In addition, the probe of the detection equipment is not easy to clean and is prone to adhesion, thereby reducing the detection accuracy.

[0004] In order to solve the above-mentioned defects in the prior art, a soil pH detection device and method were developed. Summary of the invention

[0005] The purpose of the invention is to provide a soil pH detection device.

[0006] Another object of the present invention is to provide a method for detecting soil pH.

[0007] To achieve the above object, the present invention provides the following technical solutions: A soil pH detection device comprises a base, a detection cabinet is arranged on the base, a touch screen is arranged on the detection cabinet, a program control unit is externally connected to the touch screen, the program control unit comprises a software control system and a hardware drive unit, the hardware drive unit is controlled to work by the software control system, a cabinet door is arranged on the detection cabinet; a screening device is installed on one side of the detection cabinet; a moving mechanism is installed in the detection cabinet, a first electric push rod is installed on the moving mechanism, a detection probe is installed at the bottom end of the first electric push rod, and the detection probe moves left and right and up and down under the action of the moving mechanism and the first electric push rod Downward movement; three calibration devices are arranged at the bottom of the detection probe, and sample boxes and cleaning devices are arranged on both sides of the three calibration devices respectively; the screening device cooperates with the sample box; the screening device includes a crushing cylinder, a screening slot, a coarse filter plate, a crushing mechanism, a discharge pipe and a fine filter plate, the crushing cylinder is obliquely installed on the detection cabinet, a screening slot is arranged on the top of one end of the crushing cylinder, a coarse filter plate is installed at the bottom end of the screening slot, a crushing mechanism is installed in the crushing cylinder, a fine filter plate is installed at the other end of the crushing cylinder, and a discharge pipe is sleeved on the outside of the crushing cylinder; the calibration device includes a solution tank and a sealing assembly.

[0008] Furthermore, the pulverizing mechanism comprises a first motor, a rotating rod, a spiral conveying blade, and a pulverizing knife. The output end of the first motor is connected to the rotating rod, and the spiral conveying blade and the pulverizing knife are arranged on the rotating rod.

[0009] The moving mechanism includes a second motor, a screw, a slide rail and a slide seat. The second motor is installed on the inner wall of the detection cabinet. The output end of the second motor is connected to the screw. Slide rails are arranged on both sides of the screw. A slide seat is sleeved on the screw. The slide seat is slidably connected to the two slide rails, and the first electric push rod is installed on the slide seat.

[0010] The cleaning device includes a cleaning cylinder, a sewage pipe, a sewage valve, a water injection pipe, a first connecting head, an air duct, a second connecting head, a water spray port and an air blowing port; the cleaning cylinder is installed at the bottom end of the detection cabinet, a sewage pipe is provided at the bottom of the cleaning cylinder, and a sewage valve is installed on the sewage pipe; the water injection pipe is arranged in a ring on the wall of the cleaning barrel, and more than three water spray ports are evenly provided on the inner wall of the cleaning barrel of the ring-arranged cleaning cylinder; the water injection pipe is connected to the first connecting head, and the first connecting head is connected to a water pump for supplying distilled water; the air duct is arranged in a ring on the wall of the cleaning barrel above the water spray port, and more than three air blowing ports are evenly provided on the inner wall of the cleaning barrel of the ring-arranged air duct, the air duct is connected to the second connecting head, and the second connecting head is connected to the fan.

[0011] The water spray ports and air blowing ports are arranged in a ring shape.

[0012] The solution tank comprises a tank body, a tank mouth, a fixing box and a guide groove. The top of the tank body is provided with a tank mouth, one side of the tank mouth is provided with a fixing box, and the fixing box is provided with a guide groove.

[0013] The sealing assembly includes a second electric push rod and a sealing plate. The second electric push rod is installed outside the fixing box. The telescopic end of the second electric push rod is connected to the sealing plate which is slidably connected to the guide groove.

[0014] The detection method using the soil pH detection device described above includes the following steps: S1: Soil samples taken from farmland are placed in the screening tank, and the stones in the soil samples are screened out through the coarse filter plate; S2: The sieved soil enters the crushing cylinder and is transported by the crushing mechanism. After crushing, it is filtered by the fine filter plate. The discharge pipe is operated so that the discharge end is above the sample storage box to receive the soil samples that meet the requirements. S3: The moving mechanism operates, firstly moving the detection probe to the top of the cleaning device, and inserting the detection probe into the cleaning device in cooperation with the first electric push rod. The cleaning device cleans and dries the floating dust on the surface of the detection probe to keep the detection probe clean; S4: After the detection probe is cleaned, it cooperates with the moving mechanism and the first electric push rod to enter three solution tanks in turn. The three solution tanks are respectively filled with acid-base calibration solutions of different pH values ​​for precision calibration. After each detection of the corresponding calibration solution, the cleaning device needs to be cleaned to ensure the calibration accuracy; S5: After the calibration of the detection probe and the receipt of the soil sample in the sample storage box are completed, the moving mechanism cooperates with the first electric push rod to perform a sample pH test on the soil sample in the sample storage box; S6: After a group of soil samples are tested, take out the sample box and replace it, then repeat the above steps to test multiple groups of samples. After multiple tests, the data of each test is displayed on the touch screen, and the pH value of the soil is automatically calculated by the system to complete the soil test.

[0015] The software control system controls the hardware drive unit to work, wherein the hardware drive unit includes a first motor, a second motor, a first electric push rod, a drain valve, a second electric push rod, and a water pump and a fan for controlling the water injection pipe and the air guide pipe, which are electrically connected to the software control system respectively; during operation, the first motor drives the rotating rod to rotate, so that the spiral conveying blade and the crushing knife rotate synchronously. During the rotation process, the spiral conveying blade will transport the soil screened from the screening slot to the position of the crushing knife. After the crushing knife crushes the soil, it is quickly screened out from the fine filter plate. The spiral conveying blade can not only increase the feeding speed, but also cooperate with the crushing knife to quickly crush the soil, thereby improving the crushing efficiency, thereby increasing the processing speed of the soil sample and improving the convenience of soil sample processing; The operation of the second motor drives the screw rod to rotate, so that the slide can move along the slide rail, driving the detection probe installed at the telescopic end of the first electric push rod to move, so as to facilitate the movement and positioning of the position of the detection probe, and the setting of the first electric push rod is convenient for adjusting the lowering height of the detection probe; after the detection probe is inserted into the cleaning cylinder, the water pump draws distilled water into the water injection pipe, and sprays it obliquely downward from each water spray port onto the detection probe to clean the attachments on the detection probe. During the cleaning process, the detection probe moves slowly upward, and the attachments are easier to clean through flushing, and the cleaning is comprehensive to avoid attachment residues. As the detection probe moves to the air outlet to be cleaned, the fan runs to blow air through the air guide pipe and blows it out from each air outlet to clean the detection probe. The water droplets on the probe are blown off so that the attached water droplets can be blown off quickly, ensuring that the detection probe can remain dry after being removed, avoiding the influence of excessive moisture on the pH detection of soil samples. In the cleaning process, opening the drain valve can discharge the sewage from the drain pipe, and with the blowing of the wind, the sewage gathered at the bottom can be discharged downward, thereby improving the sewage discharge efficiency. Through the extension and retraction of the second electric push rod, the sealing plate can move back and forth in the guide groove, so as to control the opening and closing of the tank mouth, so that when the detection probe needs to be calibrated, the tank mouth can be opened, and when the detection probe does not need to be calibrated, the tank mouth can be closed to avoid the evaporation of the calibration solution in the tank body, resulting in changes in the pH value. At the same time, it can avoid external pollution and improve the accuracy of the calibration of the detection probe.

[0016] Compared with the prior art, the present invention can significantly improve the accuracy of detection and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the internal structure of the test cabinet of the present invention.

[0019] Figure 3It is a schematic structural diagram of the screening device of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the screening drum of the present invention.

[0021] Figure 5 It is a structural schematic diagram of the crushing mechanism of the present invention.

[0022] Figure 6 It is a structural schematic diagram of the moving mechanism of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of the calibration device of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the solution tank of the present invention.

[0025] Fig. 9 It is a schematic structural diagram of the sealing assembly of the present invention.

[0026] Fig.10 It is a schematic structural diagram of the cleaning device of the present invention.

[0027] Fig.11 It is a schematic diagram of the top inner wall structure of the cleaning device of the present invention.

[0028] The reference numerals are: 1, base; 2, detection cabinet; 3, touch screen; 4, cabinet door; 5, screening device; 51, crushing cylinder; 52, screening slot; 53, coarse filter plate; 54, crushing mechanism; 5401, first motor; 5402, rotating rod; 5403, spiral conveying blade; 5404, crushing knife; 55, discharge pipe; 56. fine filter plate; 6. sample storage box; 7. moving mechanism; 701. second motor; 702. screw rod; 703. slide rail; 704. slide seat; 8. first electric push rod; 9. detection probe; 10. cleaning device; 101. cleaning cylinder; 102. drain pipe; 103. drain valve; 104. water injection pipe; 105. first connector; 106. air duct; 107. second connector; 108. water spray port; 109. air blowing port; 11. calibration device; 111. solution tank; 1111. tank body; 1112. tank mouth; 1113. fixing box; 1114. guide groove; 112. sealing assembly; 1121. second electric push rod; 1122. sealing plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1-11 The soil pH detection device shown in the figure comprises a base 1, a detection cabinet 2 is arranged on the base 1, a touch screen 3 is arranged on the detection cabinet 2, the touch screen 3 is externally connected to a program control unit, the program control unit comprises a software control system and a hardware drive unit, the hardware drive unit is controlled to work by the software control system, a cabinet door 4 is arranged on the detection cabinet 2; a screening device 5 is installed on one side of the detection cabinet 2; a moving mechanism 7 is installed in the detection cabinet 2, a first electric push rod 8 is installed on the moving mechanism 7, a detection probe 9 is installed at the bottom end of the first electric push rod 8, the detection probe 9 moves left and right and up and down under the action of the moving mechanism 7 and the first electric push rod 8; the detection probe 9 Three calibration devices 11 are arranged at the bottom, and sample boxes 6 and cleaning devices 10 are arranged on both sides of the three calibration devices 11 respectively; the screening device 5 cooperates with the sample box 6; the screening device 5 includes a crushing barrel 51, a screening slot 52, a coarse filter plate 53, a crushing mechanism 54, a discharge pipe 55 and a fine filter plate 56, the crushing barrel 51 is obliquely installed on the detection cabinet 2, a screening slot 52 is arranged on the top of one end of the crushing barrel 51, a coarse filter plate 53 is installed at the bottom end of the screening slot 52, a crushing mechanism 54 is installed in the crushing barrel 51, a fine filter plate 56 is installed in the other end of the crushing barrel 51, and a discharge pipe 55 is sleeved on the outside of the crushing barrel 51; the calibration device 11 includes a solution tank 111 and a sealing assembly 112.

[0031] like Figure 3-5 The crushing mechanism 54 shown includes a first motor 5401, a rotating rod 5402, a spiral conveying blade 5403, and a crushing knife 5404. The output end of the first motor 5401 is connected to the rotating rod 5402, and the spiral conveying blade 5403 and the crushing knife 5404 are arranged on the rotating rod 5402. During operation, the first motor 5401 drives the rotating rod 5402 to rotate, so that the spiral conveying blade 5403 and the crushing knife 5404 rotate synchronously. During the rotation process, the spiral conveying blade 5403 transports the soil sieved from the screening slot 52 to the position of the crushing knife 5404. After the crushing knife 5404 crushes the soil, it is quickly screened out from the fine filter plate 56. The spiral conveying blade 5403 can not only increase the feeding speed, but also cooperate with the crushing knife 5404 to quickly crush the soil.

[0032] like Figure 6The moving mechanism 7 shown includes a second motor 701, a screw rod 702, a slide rail 703 and a slide seat 704. The second motor 701 is installed on the inner wall of the detection cabinet 2. The output end of the second motor 701 is connected to the screw rod 702. Slide rails 703 are arranged on both sides of the screw rod 702. A slide seat 704 is sleeved on the screw rod 702. The slide seat 704 is slidably connected with the two slide rails 703, and the first electric push rod 8 is installed on the slide seat 704; the operation of the second motor 701 drives the screw rod 702 to rotate, so that the slide seat 704 can move along the slide rail 703, driving the detection probe 9 installed at the telescopic end of the first electric push rod 8 to move, so as to facilitate the movement and positioning of the position of the detection probe 9, and the descent height of the detection probe 8 is adjusted by the telescopic movement of the first electric push rod 8.

[0033] like Fig.10 , 11 The cleaning device 10 shown includes a cleaning barrel 101, a sewage pipe 102, a sewage valve 103, a water injection pipe 104, a first connector 105, an air guide pipe 106, a second connector 107, a water spray port 108 and an air blowing port 109; the cleaning barrel 101 is installed at the bottom of the detection cabinet 2, a sewage pipe 102 is opened at the bottom of the cleaning barrel 101, and a sewage valve 103 is installed on the sewage pipe 102; the water injection pipe 104 is arranged on the wall of the cleaning barrel 101, The inner wall of the cleaning barrel 101 of the ring-arranged cleaning cylinder 101 is evenly provided with more than three water spraying ports 108, the water injection pipe 104 is connected to the first connector 105, and the first connector 105 is connected to a water pump for supplying distilled water; the air guide pipe 106 is arranged on the wall of the cleaning barrel 101 above the water spraying port 108, and the inner wall of the cleaning barrel 101 of the ring-arranged air guide pipe 106 is evenly provided with more than three blowing ports 109, and the air guide pipe 106 is connected to the second connector 1 07, the second connector 107 is connected to the fan, wherein the water spray port 108 and the air blowing port 109 are arranged in a ring shape and the opening is opened downward; after the detection probe 9 is inserted into the cleaning tube 101, the water pump draws distilled water into the water injection pipe 104, and sprays it obliquely downward from each water spray port 108 onto the detection probe 9 to clean the attachments on the detection probe 9. During the cleaning process, the detection probe 9 moves slowly upward, and the attachments are easier to clean through flushing, and the cleaning is comprehensive to avoid attachment residues. As the position of the detection probe 9 to be cleaned moves to the air blowing port 109, the fan starts to blow air to the air guide 106, and blows it out from each air blowing port to blow off the water droplets on the detection probe 9, so that the attached water droplets can be quickly blown off, ensuring that the detection probe 9 can remain dry after being removed, avoiding the influence of excessive moisture on the pH detection of the soil sample, and during the cleaning process, opening the drain valve 103 can allow sewage to be discharged from the drain pipe 102.

[0034] like Figure 7-9The solution tank 111 shown includes a tank body 1111, a tank mouth 1112, a fixing box 1113 and a guide groove 1114. The tank body 1111 is provided with a tank mouth 1112 at the top, and a fixing box 1113 is provided on one side of the tank mouth 1112. A guide groove 1114 is provided in the fixing box 1113. The sealing assembly 112 includes a second electric push rod 1121 and a sealing plate 1122. The second electric push rod 1121 is installed on the outside of the fixing box 1113, and the telescopic end of the second electric push rod 1121 is connected to a sealing plate 1122 which is slidably connected to the guide groove 1114. Through the telescopic movement of the second electric push rod, the sealing plate can be moved back and forth in the guide groove, so as to control the opening and closing of the tank mouth, so that the tank mouth can be opened when the detection probe needs to be calibrated, and the tank mouth can be closed when the detection probe does not need to be calibrated.

[0035] When in use, the three solution tanks 111 are respectively filled with calibration solutions with pH values ​​of 4.0, 7.0 and 10.0. The specific detection method comprises the following steps: The soil sample taken from the farmland is placed in the screening tank 52, and the stones in the soil sample are screened out through the coarse filter plate 53; The sieved soil enters the crushing cylinder 51 and is transported by the crushing mechanism 54. After crushing, it is filtered by the fine filter plate 56, and cooperates with the discharge pipe 55 to operate so that the discharge end is above the sample storage box 6 to receive the soil sample that meets the requirements. The moving mechanism 7 is in operation, and the detection probe 9 is first moved to the top of the cleaning device 10, and the detection probe 9 is inserted into the cleaning device 10 in cooperation with the first electric push rod 8. The cleaning device 10 cleans and dries the floating dust on the surface of the detection probe 9 to keep the detection probe 9 clean; After the detection probe 9 is cleaned, it cooperates with the moving mechanism 7 and the first electric push rod 8 to enter the three solution tanks 111 in sequence. The three solution tanks 111 are respectively filled with calibration solutions with pH values ​​of 4.0, 7.0 and 10.0 for precision calibration. After each detection of the corresponding calibration solution, the cleaning device 10 is required to clean it to ensure the calibration accuracy; After the calibration of the detection probe 9 and the receipt of the soil sample in the sample storage box 6 are completed, the moving mechanism 7 cooperates with the first electric push rod 8 to perform a sample pH test on the soil sample in the sample storage box 6; After a group of soil samples are tested, the sample box 6 is taken out and replaced, and then the above steps are repeated to test multiple groups of samples. After multiple tests, the data of each test is displayed on the touch screen 3, and the pH value of the soil is automatically calculated by the system to complete the soil test.

[0036] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soil pH detection device, comprising a base (1), a detection cabinet (2) being arranged on the base (1), a touch screen (3) being arranged on the detection cabinet (2), the touch screen (3) being externally connected to a program control unit, the program control unit comprising a software control system and a hardware drive unit, the hardware drive unit being controlled by the software control system to operate, and a cabinet door (4) being arranged on the detection cabinet (2); characterized in that: A screening device (5) is installed on one side of the detection cabinet (2); a moving mechanism (7) is installed in the detection cabinet (2); a first electric push rod (8) is installed on the moving mechanism (7); a detection probe (9) is installed at the bottom end of the first electric push rod (8); the detection probe (9) moves left and right and up and down under the action of the moving mechanism (7) and the first electric push rod (8); The bottom of the detection probe (9) is provided with three calibration devices (11), and the two sides of the three calibration devices (11) are provided with sample storage boxes (6) and cleaning devices (10) respectively; the screening device (5) cooperates with the sample storage box (6); the screening device (5) comprises a crushing cylinder (51), a screening slot (52), a coarse filter plate (53), a crushing mechanism (54), a discharge pipe (55) and a fine filter plate (56); the crushing cylinder (51) is obliquely mounted on the detection cabinet (2); the top of one end of the crushing cylinder (51) is provided with a screening slot (52), the bottom of the screening slot (52) is provided with a coarse filter plate (53), the crushing mechanism (54) is installed in the crushing cylinder (51), the other end of the crushing cylinder (51) is provided with a fine filter plate (56), and the outside of the crushing cylinder (51) is sleeved with a discharge pipe (55); the calibration device (11) comprises a solution tank (111) and a sealing assembly (112).

2. The soil pH detection device according to claim 1, characterized in that: The pulverizing mechanism (54) comprises a first motor (5401), a rotating rod (5402), a spiral conveying blade (5403), and a pulverizing knife (5404); the output end of the first motor (5401) is connected to the rotating rod (5402); and the spiral conveying blade (5403) and the pulverizing knife (5404) are arranged on the rotating rod (5402).

3. The soil pH detection device according to claim 1, characterized in that: The moving mechanism (7) comprises a second motor (701), a screw rod (702), a slide rail (703) and a slide seat (704); the second motor (701) is mounted on the inner wall of the detection cabinet (2); the output end of the second motor (701) is connected to the screw rod (702); slide rails (703) are arranged on both sides of the screw rod (702); a slide seat (704) is sleeved on the screw rod (702); the slide seat (704) is slidably connected to the two slide rails (703); and the first electric push rod (8) is mounted on the slide seat (704).

4. The soil pH detection device according to claim 1, characterized in that: The cleaning device (10) comprises a cleaning barrel (101), a sewage pipe (102), a sewage valve (103), a water injection pipe (104), a first connector (105), an air guide pipe (106), a second connector (107), a water spray port (108) and an air blowing port (109); the cleaning barrel (101) is mounted at the bottom end of the detection cabinet (2); a sewage pipe (102) is provided at the bottom of the cleaning barrel (101); a sewage valve (103) is installed on the sewage pipe (102); the water injection pipe (104) is arranged in a ring on the wall of the cleaning barrel (101); the inner wall of the cleaning barrel (101) of the ring-arranged cleaning barrel (101) is evenly provided with more than three water spray ports (108); The water injection pipe (104) is connected to a first connector (105), and the first connector (105) is connected to a water pump for supplying distilled water; the air guide pipe (106) is arranged on the wall of the cleaning barrel (101) above the water spray port (108), and the inner wall of the cleaning barrel (101) of the air guide pipe (106) is evenly provided with more than three blowing ports (109); the air guide pipe (106) is connected to a second connector (107), and the second connector (107) is connected to a fan.

5. The soil pH detection device according to claim 4, characterized in that: The water spray outlets (108) and the air blowing outlets (109) are both arranged in a ring shape.

6. The soil pH detection device according to claim 1, characterized in that: The solution tank (111) comprises a tank body (1111), a tank mouth (1112), a fixing box (1113) and a guide groove (1114); the tank body (1111) has a tank mouth (1112) at the top, a fixing box (1113) is arranged on one side of the tank mouth (1112), and a guide groove (1114) is arranged in the fixing box (1113).

7. The soil pH detection device according to claim 6, characterized in that: The sealing assembly (112) comprises a second electric push rod (1121) and a sealing plate (1122); the second electric push rod (1121) is mounted outside the fixing box (1113); the telescopic end of the second electric push rod (1121) is connected to the sealing plate (1122) which is slidably connected to the guide groove (1114).

8. A method for detecting soil pH using the device according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Place a soil sample in a screening tank (52) and screen it through a coarse filter plate (53). The screened soil enters a crushing cylinder (51) and is conveyed and crushed by a crushing mechanism (54). The soil is then filtered by a fine filter plate (56) and fed into a sample storage box (6) through a discharge pipe (55). 2) The moving mechanism (7) operates to first move the detection probe (9) to the position directly above the cleaning device (10), and the first electric push rod (8) inserts the detection probe (9) into the cleaning device (10) for cleaning and drying; 3) After the detection probe (9) is cleaned, the moving mechanism (7) and the first electric push rod (8) are coordinated to sequentially enter three solution tanks (111), wherein the three solution tanks (111) are respectively filled with calibration solutions of different pH values, for precision calibration. After each detection of the corresponding calibration solution, the cleaning device (10) is required to clean it to ensure the calibration accuracy; 4) Through the action of the moving mechanism (7) and the first electric push rod (8), the detection probe (9) is sent into the sample storage box (6) to perform a sample pH test on the soil sample; 5) After a set of soil samples are tested, the sample box (6) is taken out and replaced, and then the above steps are repeated to test multiple sets of samples. After multiple tests, the data of each test is displayed on the touch screen (3), and the pH value of the soil is automatically calculated by the system to complete the soil test.

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