Anti-freezing soil tensiometer

Abstract

The invention discloses an anti-freezing soil tensiometer, and relates to the technical field of soil tension measuring equipment, the anti-freezing soil tensiometer comprises a pottery clay head, a control mechanism and a power supply mechanism, an organic glass tube is mounted on the pottery clay head, the upper surface of the organic glass tube is of an opening structure, and a sealing cover is fixedly mounted at the upper end of the organic glass tube; a protection mechanism is fixedly installed on the outer surface of the sealing cover and arranged on the outer surface of the organic glass tube in a sleeving mode, and a pressure sensor, an exhaust pipe and a heating circulation mechanism are fixedly embedded in the sealing cover. According to the soil tensiometer, the functions of heating and heat preservation in the organic glass tube are added, the anti-freezing function is effectively added, water can be supplemented to the organic glass tube in time, the accuracy and reliability of soil moisture tension measurement are improved, the service life of equipment is prolonged, and meanwhile the warning function is added, so that the soil tensiometer is not prone to being accidentally touched and damaged.

Description

Technical Field

[0001] The invention relates to the technical field of soil tension measuring equipment, in particular to a soil tension meter capable of preventing freezing. Background Art

[0002] Soil tensiometer is a device that can directly and accurately monitor soil moisture. It uses soil water potential to accurately reflect the degree to which soil moisture can be effectively absorbed and utilized by crops from an energy perspective. Traditional soil tensiometer equipment is mainly composed of clay heads, plexiglass tubes, sealing plugs, vacuum gauges and other components. When the soil tensiometer is working in the soil, the upper part of the soil tensiometer is easily affected by the external ambient temperature. The lower clay head of the soil tensiometer is deeply buried in the soil and is generally not greatly affected by the outside world. The temperature is not much different from the soil temperature, which results in higher temperatures in the upper and lower parts of the soil tensiometer, resulting in inaccurate measurement data.

[0003] Patent CN202411211077.3, title: An intelligent soil tensiometer capable of automatic collection and transmission, in which an insulation layer is set on the outside of the soil tensiometer, and the insulation layer is rock wool layer, first XPS insulation board layer, second XPS insulation board layer, aerogel insulation felt layer and air layer from the outside to the inside. The height of the air layer and the rock wool layer is consistent with the protective round shell, the height of the aerogel insulation felt layer is 15-20cm, the height of the second XPS insulation board layer is 25-30cm, and the length of the first XPS insulation board layer 504 is 30-60cm. According to the relationship between soil depth and temperature, different insulation material combinations are used at different heights, so that the temperature of the organic glass tube in the protective round shell is not much different, and is almost the same, which effectively reduces the problem of uneven heating of the soil tensiometer, resulting in its measurement error, and effectively solves the insulation problem of the soil tensiometer. However, in a low-temperature environment, the above structure cannot actively heat and prevent freezing under low-temperature conditions. It is easy for water on the upper part of the plexiglass tube to freeze and form ice, resulting in an ice-water mixture, which causes the equipment to fail to work properly, inaccurate measurement data, and may even cause equipment damage, affecting the reliability of soil moisture monitoring. Summary of the invention

[0004] The invention provides a soil tensiometer capable of preventing freezing, which solves the problems that the existing soil sensor cannot be automatically heated, cannot be used in a low temperature environment or the measured data is inaccurate.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A soil tensiometer capable of preventing freezing, comprising a clay head, a control mechanism and a power supply mechanism, wherein an organic glass tube is installed on the clay head, and the upper surface of the organic glass tube is an open structure, a sealing cover is fixedly installed on the upper end of the organic glass tube, a protective mechanism is fixedly installed on the outer surface of the sealing cover, and the protective mechanism is sleeved on the outer surface of the organic glass tube, a pressure sensor, an exhaust pipe and a heating circulation mechanism are fixedly embedded on the sealing cover, and the heating circulation mechanism comprises a heating wire, a first temperature sensor, a second temperature sensor, a micro-circulation pump, a circulating water inlet pipe and a circulating water outlet pipe, and the heating wire, the first temperature sensor, the exhaust pipe and the heating circulation mechanism are fixedly embedded on the sealing cover. The first temperature sensor and the second temperature sensor are installed on the upper surface of the sealing cover, and the heating wire, the first temperature sensor and the second temperature sensor are inserted in the organic glass tube, the first temperature sensor is arranged on the top of the organic glass tube, the second temperature sensor is arranged on the upper part of the clay head, the circulating water inlet pipe and the circulating water outlet pipe are connected with the micro-circulating pump, the circulating water inlet pipe is arranged at 1 / 4-1 / 3 of the upper part of the organic glass tube, the circulating water inlet pipe is arranged at the bottom of the organic glass tube, and the heating wire, the first temperature sensor, the second temperature sensor and the micro-circulating pump are electrically connected to the control mechanism respectively.

[0006] As a preferred technical solution of the present invention, a plug is fixedly embedded on the upper inner wall of the sealing cover, and the plug is inserted into the organic glass tube.

[0007] As a preferred technical solution of the present invention, the protective mechanism includes a shell, a thermal insulation layer and a rubber sealing ring. The shell is threadedly mounted on the outer surface of the sealing cover. The thermal insulation layer is fixedly mounted on the inner wall of the shell. The thermal insulation layer fits the outer surface of the organic glass tube, and the rubber sealing ring fits tightly against the outer surface of the organic glass tube. As a preferred technical solution of the present invention, the control mechanism includes a control box, a controller, an information processing module, a storage device, a wireless communication module and a waterproof switch. The controller is mounted on the lower inner wall of the control box. The controller is provided with an information processing module, a storage device and a wireless communication module. The waterproof switch is embedded in the front side of the front side wall of the control box. The controller is electrically connected to the information processing module, the storage device, the wireless communication module, the waterproof switch and the pressure sensor. The upper surface of the control box is threadedly mounted with a box cover.

[0008] As a preferred technical solution of the present invention, the power supply mechanism includes a solar power supply mechanism, which includes a battery and a solar panel. The battery is installed on the lower inner wall of the control box, and the solar panel is embedded in the upper surface of the box cover.

[0009] As a preferred technical solution of the present invention, warning mechanisms are evenly arranged on the four sides of the control box, and the warning mechanisms include a transparent lampshade, a light bar and a photosensitive sensor. The transparent lampshade is embedded in the outer surface of the control box, and the light bar is fixedly installed inside the transparent lampshade. The photosensitive sensor is embedded in the front and rear side walls of the control box, and the light bar and the photosensitive sensor are electrically connected to the controller.

[0010] As a preferred technical solution of the present invention, it also includes a water replenishment mechanism, which includes a water storage box, a water replenishment inlet pipe, a solenoid valve, a heating mechanism and a ranging sensor. The water storage box is installed on the lower inner wall of the control box, and the water storage box is connected to the organic glass tube through the water replenishment inlet pipe. The water replenishment inlet pipe is provided with a solenoid valve.

[0011] As a preferred technical solution of the present invention, the distance sensor is installed on the sealing cover, and the distance sensor is inserted into the organic glass tube, and the solenoid valve is electrically connected to the distance sensor and the controller.

[0012] As a preferred technical solution of the present invention, a water filling sealing plug and a one-way water inlet valve are provided on the upper surface of the water storage box.

[0013] Beneficial effects of the present invention: Compared with the prior art, the present invention provides a frost-proof soil tensiometer, which has the following beneficial effects: 1. The antifreeze soil tensiometer, by setting a control mechanism and a heating mechanism, adds the function of heating the water in the organic glass tube, increases the water temperature in the organic glass tube, effectively increases the antifreeze function, effectively prevents freezing in a low temperature environment, ensures that the equipment can work normally under cold conditions, keeps the water temperature in the organic glass tube within the preset normal temperature range, and avoids inaccurate measurements or equipment damage caused by low temperatures. This design not only improves the accuracy and reliability of soil moisture tension measurement, extends the service life of the equipment, reduces maintenance and replacement costs, but also can adapt to various complex field environments, providing reliable technical guarantees for agricultural production and environmental monitoring.

[0014] 2. This antifreeze soil tension meter can provide real-time soil tension monitoring data by setting up a control mechanism and a water replenishment mechanism. It can be set up outdoors for a long time, which improves the accuracy and reliability of soil moisture tension measurement and extends the service life of the equipment.

[0015] 3. The antifreeze soil tensiometer increases the warning function of the soil tensiometer by arranging a control mechanism to cooperate with the warning mechanism. The warning mechanism flashes, so that the soil tensiometer is not easily damaged by accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a frost-proof soil tensiometer proposed by the present invention; Figure 2 A cross-sectional view of a plexiglass tube of a frost-proof soil tensiometer proposed by the present invention; Figure 3 A schematic diagram of the structure of another antifreeze soil tensiometer proposed by the present invention; Figure 4 A cross-sectional view of another organic glass tube of a soil tensiometer that can prevent freezing proposed by the present invention; Figure 5 It is a structural block diagram of the control system mechanism of the present invention; In the figure: 1. Clay head; 2. Organic glass tube; 3. Protective mechanism; 31. Shell; 32. Insulation layer; 33. Rubber sealing ring; 4. Control mechanism; 41. Control box; 42. Waterproof switch; 43. Controller; 44. Information processing module; 45. Storage; 46. Wireless communication module; 5. Box cover; 6. Power supply mechanism; 61. Solar panel; 62. Battery; 7. Heating circulation mechanism; 71. Micro circulation pump; 72. Circulating water inlet pipe; 73. Electric Hot wire; 74, first temperature sensor; 75, circulating water outlet pipe; 76, second temperature sensor, 8, plug; 9, pressure sensor; 10, exhaust pipe; 11, warning mechanism; 111, transparent lampshade; 112, photosensor; 113, light bar; 12, water replenishment mechanism; 121, water storage box; 122, heating mechanism; 123, water replenishment inlet pipe; 124, solenoid valve; 125, distance sensor; 126, water filling sealing plug; 127, one-way air inlet valve; 13, sealing cover. DETAILED DESCRIPTION

[0018] 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.

[0019] Example 1 like Figure 1 , 2As shown in Figure 5, a frost-proof soil tensiometer includes a clay head 1, a control mechanism 4 and a power supply mechanism 6. A plexiglass tube 2 is installed on the clay head 1, and the upper surface of the plexiglass tube 2 is an open structure. A sealing cover 13 is fixedly installed on the upper end of the plexiglass tube 2, and a protective mechanism 3 is fixedly installed on the outer surface of the sealing cover 13. The protective mechanism 3 is sleeved on the outer surface of the plexiglass tube 2, and a pressure sensor 9, an exhaust pipe 10 and a heating circulation mechanism 7 are fixedly embedded on the sealing cover 13.

[0020] The clay head 1 is the sensing component of the instrument and has many tiny pores. After the clay head 1 is soaked in water, a layer of water film is formed in the pores. When the water-filled and sealed soil moisture meter is inserted into the unsaturated soil, the water film is connected with the soil water, causing the water inside the instrument to generate negative pressure.

[0021] The organic glass tube 2 is a transparent polymer material with the characteristics of high transparency, high mechanical strength, light weight, and easy processing, which ensures the sealed environment of the soil tensiometer during measurement.

[0022] The sealing cover 13 is used to seal the organic glass tube 2, and is generally made of elastic plastic. In order to further improve the sealing performance, a plug 8 is fixedly embedded on the upper inner wall of the sealing cover 13, and the plug 8 is inserted into the organic glass tube 2. The plug 8 can further improve the sealing performance.

[0023] The function of the protective mechanism 3 is to protect the plexiglass tube 2 and prevent it from being damaged, and at the same time, it plays a role of heat preservation. It can be completely coated on the outside of the plexiglass tube 2, or it can be partially coated on the outside of the plexiglass tube 2. This embodiment adopts partial coating. It generally includes a shell 31, a thermal insulation layer 32 and a rubber sealing ring 33. The shell 31 is threadedly installed on the outer surface of the sealing cover 13. The thermal insulation layer 32 is fixedly installed on the inner wall of the shell 31. The thermal insulation layer 32 is in contact with the outer surface of the plexiglass tube 2, and the rubber sealing ring 33 is in close contact with the outer surface of the plexiglass tube 2. The thermal insulation layer generally adopts thermal insulation materials, such as rock wool, XPS thermal insulation board, aerogel thermal insulation felt, etc., and a multi-layer thermal insulation structure with different thicknesses or lengths can also be used. This embodiment adopts a single-layer thermal insulation layer and an XPS thermal insulation board.

[0024] The heating circulation mechanism 7 includes a heating wire 73, a first temperature sensor 74, a second temperature sensor 76, a micro-circulation pump 71, a circulation water inlet pipe 72 and a circulation water outlet pipe 75. The heating wire 73, the first temperature sensor 74 and the second temperature sensor 76 are installed on the upper surface of the sealing cover 13, and the heating wire 73, the first temperature sensor 74 and the second temperature sensor 76 are inserted into the organic glass tube 2, the first temperature sensor 74 is arranged on the top of the organic glass tube 2, the second temperature sensor 76 is arranged on the upper part of the clay head 1, the circulation water inlet pipe 72 and the circulation water outlet pipe 75 are connected with the micro-circulation pump 71, the circulation water inlet pipe 72 is arranged at 1 / 4-1 / 3 of the upper part of the organic glass tube 2, and the circulation water inlet pipe 72 is arranged at the bottom of the organic glass tube 2. The heating wire 73, the first temperature sensor 74, the second temperature sensor 76 and the micro-circulation pump 71 are electrically connected to the control mechanism 4 respectively.

[0025] The pressure sensor 9 and the exhaust pipe 10 pass through the sealing cover 13 and the plug 8 and extend into the organic glass tube 2. The pressure sensor 9 can measure the gas or liquid pressure with a measurement range accuracy of -1~0Mpa, and is used to monitor the soil negative pressure.

[0026] An exhaust valve is provided on the exhaust pipe 10. The exhaust valve generally adopts a normally closed device with stable working performance and rapid response. When the organic glass tube 2 needs to be replenished with water or exhausted, it can achieve rapid exhaust and restore to normal water supply capacity in a short time.

[0027] The heating circulation mechanism 7 is mainly used to heat the water in the organic glass tube 2 and maintain its pressure stability.

[0028] The heating wire 73 is used for heating and is generally arranged on the upper part of the organic glass tube 2.

[0029] The control mechanism 4 includes a control box 41, a controller 43, an information processing module 44, a storage 45, a wireless communication module 46 and a waterproof switch 42. The control box 41 is used to protect the control mechanism 4, and generally adopts a round or square insulation box. This embodiment adopts a square insulation box. The controller 43 is installed on the lower inner wall of the control box 41. The information processing module 44, the storage 45 and the wireless communication module 46 are arranged on the controller 43. The waterproof switch 42 is embedded in the front side of the front side wall of the control box 41, and the controller 43 is electrically connected to the information processing module 44, the storage 45, the wireless communication module 46, the waterproof switch 42 and the pressure sensor 9.

[0030] The power supply mechanism 6 is mainly used to provide power to the device, and can be a battery, a solar power supply mechanism 6, etc. This embodiment uses a solar power supply mechanism 6, which includes a battery 62 and a solar panel 61. The battery 62 is installed on the lower inner wall of the control box 41, and the solar panel 61 is embedded in the upper surface of the box cover 5. In this embodiment, the solar panel 61 charges the battery 62, and the battery 62 provides power for various electrical components.

[0031] In this embodiment, the waterproof switch 42 turns on the controller 43, and the controller 43 collects information from the pressure sensor 9, and then processes it through the information processing module 44, converts the measured analog quantity into a digital quantity, that is, soil moisture, and stores it through the storage 45. And send it to the background server through the wireless communication module 46, so as to timely understand the soil moisture conditions. The wireless communication module 46 can choose to use WIFi, LORA, Zigbee, 4G, NB-lot, etc., which is helpful for remote control and realizes real-time monitoring of soil moisture conditions. The controller 43 uses STM32 series, STC series, etc. to ensure the stability and accuracy of system operation.

[0032] The working principle and use process of the present invention are as follows: the soil tensiometer is assembled, and the initial state is adjusted, and a hole is drilled, and the soil tensiometer of this embodiment is fixed in the soil to be measured.

[0033] The waterproof switch 42 in the control mechanism 4 turns on the controller 43, and the controller 43 collects information from the pressure sensor 9, and then processes it through the information processing module 44, converts the measured analog quantity into a digital quantity, that is, soil moisture, and stores it through the storage 45, and sends it to the background server through the wireless communication module 46, so as to facilitate timely understanding of soil moisture conditions, facilitate remote control, and realize real-time monitoring of soil moisture conditions. It can be set outdoors for a long time, which improves the accuracy and reliability of soil moisture tension measurement and prolongs the service life of the equipment. Two temperature sensors at different positions are used. When the soil tensiometer needs to measure data for a certain period of time, such as 1-2 hours, according to the set time, the control system performs normal soil tension measurement based on the temperature data of the first temperature sensor 74 and the second temperature sensor 76. If the temperature difference between the two is within the set range, the electric heating wire 73 is started for heating, and the micro-circulation pump 71 is started at the same time to draw the water in the organic glass tube 2 from the upper part of the clay head 1 and circulate back from the top of the organic glass tube 2. The water temperature in the organic glass tube 2 can be quickly made consistent with the clay head 1, thereby reducing the problem of inaccurate measurement data caused by the large temperature difference between the upper and lower temperatures of the organic glass tube 2. The use of the micro-circulation pump 71 can smoothly and quickly achieve the temperature rise of the water in the organic glass tube 2, reducing the influence of uneven heating on the measurement data.

[0034] The soil sensor of the present invention can effectively prevent the occurrence of freezing and ensure normal operation. It can effectively prevent freezing in a low-temperature environment, ensure that the equipment can work normally under cold conditions, keep the water temperature in the organic glass tube 2 within a preset range, and avoid inaccurate measurements or equipment damage caused by low temperatures. This design not only improves the accuracy and reliability of soil moisture tension measurement, extends the service life of the equipment, reduces maintenance and replacement costs, but also can adapt to various complex field environments, providing reliable technical guarantees for agricultural production and environmental monitoring.

[0035] Example 2 like Figure 3 and 4 As shown, it is basically the same as Example 1, except that: the warning mechanism 11 is evenly arranged on the four sides of the control box 41, and the warning mechanism 11 includes a transparent lampshade 111, a light bar 113 and a photosensitive sensor 112. The transparent lampshade 111 is embedded in the outer surface of the control box 41, and the light bar 113 is fixedly installed in the transparent lampshade 111. The photosensitive sensor 112 is embedded in the front and rear side walls of the control box 41, and the light bar 113 and the photosensitive sensor 112 are electrically connected to the controller 43.

[0036] In this embodiment, the brightness of the external light is monitored by the photosensitive sensor 112 in the warning mechanism 11. When the brightness of the external light is lower than the set value, the information is fed back to the controller 43. The controller 43 makes the light bar 113 flash in the transparent lampshade 111 to emit a warning light, thereby achieving a warning effect and preventing the soil tensiometer from being accidentally damaged.

[0037] The soil tensiometer in this embodiment also includes a water replenishment mechanism 12. Specifically, the water replenishment mechanism 12 includes a water storage box 121, a water replenishment inlet pipe 123, an exhaust pipe 10, a solenoid valve 124, a heating mechanism 122 and a distance sensor 125. The water storage box 121 is installed in the control box 41. The water storage box 121 is connected to the organic glass tube 2 through the water replenishment inlet pipe 123. The exhaust pipe 10 is embedded in the sealing cover 13. The water replenishment inlet pipe 123 is provided with a solenoid valve 124. The distance sensor 125 is installed on the sealing cover 13, and the distance sensor 125 is inserted in the organic glass tube 2. The solenoid valve 124 is electrically connected to the distance sensor 125 and the controller 43.

[0038] In this embodiment, the distance sensor 125 measures the liquid level in the organic glass tube 2. When the distance sensor 125 detects that the value is greater than the preset liquid level, the information is fed back to the controller 43. The controller 43 opens the solenoid valve 124, and the water in the water storage box 121 flows into the organic glass tube 2. The gas in the organic glass tube 2 is discharged through the exhaust pipe 10. When the distance sensor 125 detects that the liquid level reaches the set height, the controller 43 closes the solenoid valve 124, thereby achieving the effect of automatically replenishing water to the organic glass tube 2.

[0039] Specifically, a water filling sealing plug 126 is provided on the upper surface of the water storage box 121 .

[0040] In this embodiment, the water-filling sealing plug 126 facilitates the filling of water into the water storage box 121, and a one-way air inlet valve 127 is provided on the upper side wall of the water storage box 121 to balance the water pressure in the water storage box 121 and facilitate the water to flow out through the water inlet pipe.

[0041] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil tensiometer capable of preventing freezing, comprising a clay head, a control mechanism and a power supply mechanism, wherein an organic glass tube is mounted on the clay head, and the upper surface of the organic glass tube is an open structure, a sealing cover is fixedly mounted on the upper end of the organic glass tube, a protective mechanism is fixedly mounted on the outer surface of the sealing cover, the protective mechanism is sleeved on the outer surface of the organic glass tube, a pressure sensor, an exhaust pipe and a heating circulation mechanism are fixedly embedded on the sealing cover, and the characteristics are as follows: The heating circulation mechanism includes a heating wire, a first temperature sensor, a second temperature sensor, a micro-circulation pump, a circulation water inlet pipe and a circulation water outlet pipe. The heating wire, the first temperature sensor and the second temperature sensor are installed on the upper surface of the sealing cover, and the heating wire, the first temperature sensor and the second temperature sensor are inserted into the organic glass tube. The first temperature sensor is arranged on the top of the organic glass tube, and the second temperature sensor is arranged on the upper part of the clay head. The circulation water inlet pipe and the circulation water outlet pipe are connected to the micro-circulation pump, and the circulation water outlet pipe is arranged at 1 / 4-1 / 3 of the upper part of the organic glass tube. The circulation water inlet pipe is arranged at the bottom of the organic glass tube. The heating wire, the first temperature sensor, the second temperature sensor and the micro-circulation pump are electrically connected to the control mechanism respectively.

2. A frost-proof soil tensiometer according to claim 1, characterized in that: A plug is fixedly embedded on the upper inner wall of the sealing cover, and the plug is inserted into the organic glass tube.

3. A frost-proof soil tensiometer according to claim 1, characterized in that: The protective mechanism includes a shell, a thermal insulation layer and a rubber sealing ring. The shell is threadedly installed on the outer surface of the sealing cover, and the thermal insulation layer is fixedly installed on the inner wall of the shell. The thermal insulation layer is in contact with the outer surface of the organic glass tube, and the rubber sealing ring is in close contact with the outer surface of the organic glass tube.

4. The antifreeze soil tensiometer according to claim 1, characterized in that: The control mechanism includes a control box, a controller, an information processing module, a storage, a wireless communication module and a waterproof switch. The controller is installed on the lower inner wall of the control box. The information processing module, the storage and the wireless communication module are arranged on the controller. The waterproof switch is embedded in the front side of the front wall of the control box, and the controller is electrically connected to the information processing module, the storage, the wireless communication module, the waterproof switch and the pressure sensor. A box cover is threadedly installed on the upper surface of the control box.

5. The antifreeze soil tensiometer according to claim 1, characterized in that: The power supply mechanism includes a solar power supply mechanism, which includes a battery and a solar panel. The battery is installed on the lower inner wall of the control box, and the solar panel is embedded in the upper surface of the box cover.

6. A frost-proof soil tensiometer according to claim 4, characterized in that: Warning mechanisms are evenly arranged on the four sides of the control box, and the warning mechanisms include a transparent lampshade, a light bar and a photosensitive sensor. The transparent lampshade is embedded in the outer surface of the control box, and the light bar is fixedly installed inside the transparent lampshade. The photosensitive sensor is embedded in the front and rear side walls of the control box, and the light bar and the photosensitive sensor are electrically connected to the controller.

7. The antifreeze soil tensiometer according to claim 1, characterized in that: The soil tensiometer also includes a water replenishment mechanism.

8. The antifreeze soil tensiometer according to claim 7, characterized in that: The water replenishment mechanism includes a water storage box, a water replenishment inlet pipe, a solenoid valve, a heating mechanism and a distance measuring sensor. The water storage box is installed on the lower inner wall of the control box. The water storage box is connected to the organic glass tube through the water replenishment inlet pipe. The water replenishment inlet pipe is provided with a solenoid valve.

9. The antifreeze soil tensiometer according to claim 8, characterized in that: The distance measuring sensor is installed on the sealing cover, and the distance measuring sensor is inserted into the organic glass tube. The electromagnetic valve is electrically connected with the distance measuring sensor and the controller.

10. The antifreeze soil tensiometer according to claim 8, characterized in that: The upper surface of the water storage box is provided with a water filling sealing plug and a one-way water inlet valve.

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