Durable soil matrix potential detection device

Abstract

The utility model discloses a durable soil matrix potential detection device, which comprises a ceramic head mechanism, a sealing connecting piece, a pressure detection module, a polycarbonate tube, a gas collecting tube and a sealing cover, the ceramic head mechanism comprises a ceramic head and a plurality of ceramic head reinforcements, the ceramic head is of a round-bottom tubular structure, the ceramic head reinforcements are arranged in the sealing connecting piece, and the pressure detection module is arranged in the sealing connecting piece. The plurality of ceramic head reinforcers are arranged in the side wall of the ceramic head and are uniformly distributed along the circumference of the central axis of the ceramic head; the upper end of the sealing connecting piece is detachably connected with the lower end of the polycarbonate tube, a connecting cavity is formed in the lower end of the sealing connecting piece, a connecting section is arranged at the upper end of the ceramic head, and the ceramic head is installed in the connecting cavity through the connecting section; the upper end of the gas collecting pipe is connected with the sealing cover, and the lower end of the gas collecting pipe is connected with the upper end of the polycarbonate pipe; by optimizing the ceramic head mechanism and additionally arranging the ceramic head reinforcer, the strength of the ceramic head can be effectively enhanced, the damage rate of the ceramic head in use is reduced, and the durability of the device is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to soil detection technical field, concretely relates to a durable soil matric potential detection device. BACKGROUND

[0002] Soil matric potential refers to the potential energy change of water caused by the adsorption and capillary force of soil matrix, which is an important index for studying soil water movement and crop drought characterization, and is also an important parameter for farmland irrigation management, regional hydrological condition research and watershed water balance calculation.

[0003] The probe of the soil matric potential detection device is a key component for responding to the change of soil moisture condition. Since the probe needs to be water-permeable and air-tight during work, the probe is mostly made of a porous ceramic material. However, the ceramic probe is prone to breakage during transportation and installation. When used in the field, the ceramic probe is easily cracked or broken due to frequent contact with dry or hard soil, which greatly affects the durability of the entire device and may cause agricultural production accidents.

[0004] The reason why the ceramic probe is prone to breakage also includes that the diameter difference between the reduced section (connecting section) of the ceramic probe and the main section is too large (more than 6 mm), which makes the part where the main section of the ceramic probe changes to the reduced section prone to breakage. This is because the existing soil matric potential detection device uses a plastic connecting piece to bond with the reduced section of the ceramic probe. The thick wall of the plastic connecting piece requires the outer diameter of the reduced section of the ceramic probe to be reduced so that the reduced section of the ceramic probe can be completely placed in the wall of the plastic connecting piece. This leads to a decrease in the breakage resistance of the ceramic probe, and the ceramic probe is the most vulnerable part of the soil matric potential detection device. Since the ceramic probe is expensive and cannot be used once it is cracked, there is an urgent need for a durable soil matric potential detection device. SUMMARY

[0005] The utility model aims at overcoming the shortcomings of the prior art and providing a durable soil matric potential detection device. The device optimizes the ceramic probe mechanism, adds a ceramic probe reinforcing piece, uses a stainless steel sealing connecting piece, and effectively cooperates with them to effectively enhance the strength of the ceramic probe, reduce the damage rate of the ceramic probe during use, enhance the durability of the device, prolong the service life of the entire device, and reduce the cost of agricultural production.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A kind of durable soil matrix potential detection device, including ceramic head mechanism, sealing connector, pressure detection module, polycarbonate tube, gas collecting pipe and sealing cover, the ceramic head mechanism includes ceramic head and ceramic head reinforcing part, the ceramic head is round bottom tubular structure, and test cavity is arranged in the ceramic head, the ceramic head reinforcing part has multiple, multiple ceramic head reinforcing part is arranged in the lateral wall of the ceramic head, and multiple ceramic head reinforcing part is evenly distributed along the central axis of the ceramic head circumference;

[0008] The upper end of the sealing connector is detachably connected with the lower end of the polycarbonate tube, a connecting cavity is arranged in the lower end of the sealing connector, the upper end of the ceramic head is provided with a connecting section, and the ceramic head is installed in the connecting cavity through the connecting section;The upper end of the gas collecting pipe is connected with the sealing cover, the lower end of the gas collecting pipe is connected with the upper end of the polycarbonate tube, and the pressure detection module is arranged on one side of the gas collecting pipe.

[0009] Preferably, the ceramic head includes a connecting section and a main body section, the connecting section and the main body section are coaxially arranged, the lower surface of the connecting section is connected with the upper surface of the main body section, and the diameter of the lower surface of the connecting section is the same as that of the upper surface of the main body section, and the cross-sectional diameter of the connecting section gradually decreases from the lower end to the upper end.

[0010] Preferably, the diameter of the lower surface of the connecting section is 1mm larger than that of the upper surface of the connecting section.

[0011] Preferably, the ceramic head is made of superfine alumina powder or quartz powder as a skeleton material.

[0012] Preferably, the ceramic head reinforcing part is parallel to the central axis of the ceramic head.

[0013] Preferably, the ceramic head reinforcing part and the sealing connector are made of stainless steel.

[0014] Preferably, the upper end of the sealing connector is provided with an internal thread, and the sealing connector is threadedly connected with the lower end of the polycarbonate tube through the internal thread.

[0015] Preferably, the lateral wall of the gas collecting pipe is provided with a port, and the pressure detection module is installed at the port.

[0016] Preferably, it further includes a soil drill, the bottom of the soil drill is provided with a drill bit, and the diameter of the drill bit is larger than that of the ceramic head.

[0017] Preferably, the pressure detection module adopts a mechanical vacuum pressure gauge or a pressure sensor.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] (1) The durable soil matric potential detection device of the utility model has the advantages that the ceramic head is embedded with multiple ceramic head reinforcing members made of superfine alumina powder or quartz powder, the multiple ceramic head reinforcing members are cleverly matched to form a protective structure for enhancing the strength of the ceramic head, thereby effectively enhancing the overall strength of the ceramic head, preventing the ceramic head from being broken during use, reducing the probability of damage of the ceramic head, and enhancing the overall durability of the device.

[0020] (2) The durable soil matric potential detection device of the utility model is cleverly matched with the newly designed ceramic head mechanism through the stainless steel sealing connecting piece, and the strength of the ceramic head is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of a durable soil matric potential detection device of the utility model.

[0022] Figure 2 It is a whole structure schematic view of a ceramic head mechanism of the utility model.

[0023] Figure 3 It is a whole structure schematic view of a sealing connecting piece of the utility model.

[0024] Figure 4 It is a use flow schematic view of a durable soil matric potential detection device of the utility model.

[0025] Among them, 1 is a ceramic head mechanism, 101 is a ceramic head, 1011 is a connecting section, 1012 is a main body section, 102 is a ceramic head reinforcing member, 103 is a test cavity, 2 is a pressure detection module, 3 is a polycarbonate tube, 4 is a gas collecting pipe, 5 is a sealing cover, 6 is a sealing connecting piece, 601 is an internal thread of the sealing connecting piece, and 602 is a connecting cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] The utility model will be further described below in combination with the drawings and embodiments.

[0028] In the description of the utility model, it needs to understand that, the orientation or position relation indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0029] Embodiment:

[0030] As shown in Figures 1-3 A durable soil matric potential detection device, comprising ceramic head mechanism 1, sealing connecting piece 6, pressure detection module 2, polycarbonate pipe 3, gas collecting pipe 4 and sealing cover 5, the ceramic head mechanism 1 includes ceramic head 101 and ceramic head reinforcing part 102, the ceramic head 101 is round bottom tubular structure, the ceramic head 101 is equipped with test cavity 103, the ceramic head reinforcing part 102 has multiple, multiple ceramic head reinforcing part 102 is arranged in the lateral wall of ceramic head 101, and multiple ceramic head reinforcing part 102 is evenly distributed along the circumference of the central axis of ceramic head 101;

[0031] The upper end of the sealing connecting piece 6 is detachably connected with the lower end of the polycarbonate pipe 3, the lower end of the sealing connecting piece 6 is equipped with connecting cavity 602, the upper end of the ceramic head 101 is equipped with connecting section 1011, the ceramic head 101 is installed in the connecting cavity 602 through the connecting section 1011, the upper end of the gas collecting pipe 4 is connected with the sealing cover 5, the lower end of the gas collecting pipe 5 is connected with the upper end of the polycarbonate pipe 3, and the pressure detection module 2 is arranged on one side of the gas collecting pipe 4.

[0032] As shown in Figure 1 And Figure 2 The ceramic head 101 includes connecting section 1011 and main body section 1012, the connecting section 1011 and main body section 1012 are coaxially arranged, the lower surface of the connecting section 1011 is connected with the upper surface of the main body section 1012, and the diameter of the lower surface of the connecting section 1011 is the same as the diameter of the upper surface of the main body section 1012, and the cross-sectional diameter of the connecting section 1011 gradually decreases from the lower end to the upper end. Specifically, the diameter of the lower surface of the connecting section 1011 is 1mm larger than the diameter of the upper surface of the connecting section 1011. This arrangement greatly improves the breakage resistance of the connecting section 1011, thereby reducing the possibility of ceramic head 101 breaking. The overall durability of the durable soil matric potential detection device is improved.

[0033] Specifically, the ceramic head 101 is made of superfine alumina powder or quartz powder as the skeleton material.

[0034] As shown in Figures 1-2 The ceramic head reinforcing member 102 is parallel to the central axis of the ceramic head 101, which improves the bending resistance of the ceramic head 101 and enhances the durability of the durable soil matrix potential detection device.

[0035] As shown in Figure 3 The upper end of the sealing connector 6 is provided with an internal thread, and the lower end of the polycarbonate tube 3 is provided with an external thread. The sealing connector 6 is screwed with the polycarbonate tube 3. This arrangement facilitates disassembly and carrying of the device, thereby improving the portability of the durable soil matrix potential detection device.

[0036] Specifically, as shown in Figure 3 The upper half of the sealing connector 6 is internally threaded, and the internal thread is M18*1.5. This arrangement facilitates upgrading of existing old tension meters with the same thread. The lower end of the sealing connector 6 is internally provided with a connecting cavity 602, and the inner diameter of the connecting cavity 602 is slightly larger than the connecting end of the ceramic head 101. This arrangement facilitates the placement of the connecting section 1011 in the connecting cavity 602.

[0037] Since the sealing connector 6 in the prior art is mainly made of plastic material, the connecting cavity of the sealing connector 6 must have a wall thickness of at least 3mm to meet the strength requirements, which inevitably reduces the diameter of the reduced section of the ceramic head 101 that cooperates with it, thereby forcing the ceramic head 101 to reduce its strength.

[0038] Therefore, the ceramic head reinforcing member 102 and the sealing connector 6 in the present embodiment are made of stainless steel, which effectively enhances the overall strength, sealing performance, and corrosion resistance of the durable soil matrix potential detection device, making the measurement data of the device more accurate.

[0039] After many experiments on different types of ceramic heads, the obtained ceramic head bending strength related data is shown in Table 1 below.

[0040]

[0041] Table 1: Bending strength experimental data of various types of ceramic heads

[0042] Specifically, as shown in Table 1 above, the first type is the bending strength data of the ceramic head with a reducing section in the prior art, the second type is the bending strength data of the ceramic head with the outer shape structure of the ceramic head mechanism 1 in the embodiment, and the third type is the bending strength data of the ceramic head mechanism 1 in the embodiment. It can be seen that the bending strength of the ceramic head mechanism 1 in the embodiment is more than 3 times of that of the ceramic head in the prior art. According to the current experimental results, the ceramic head 101 in the embodiment has a very low probability of breaking under normal circumstances unless it is subjected to artificial violent damage, thereby greatly improving the service life of the ceramic head 101.

[0043] It should be noted that the ceramic head mechanism 1 in the embodiment needs to be used with the sealing connector 6 made of stainless steel to effectively enhance the overall strength of the device, because the current plastic connector cannot meet the requirements of thin wall and high strength due to insufficient strength.

[0044] The durable soil matric potential detection device further comprises a soil drill, and a drill bit is arranged at the bottom of the soil drill, and the diameter of the drill bit is slightly larger than the diameter of the ceramic head. This arrangement is to enable mud to be poured around the ceramic head during installation, so as to ensure that the ceramic head can be in close contact with the soil, so that the detection is more timely, thereby improving the accuracy of the durable soil matric potential detection device.

[0045] As shown in Figure 1 , the side wall of the gas collecting pipe 4 is provided with an interface, and the pressure detection module 2 is installed at the interface.

[0046] In the embodiment, the pressure detection module 2 adopts a mechanical vacuum pressure gauge.

[0047] It should be noted that the polycarbonate pipe 3 is used in the embodiment because it has the advantages of high transparency, high strength and strong anti-aging ability, thereby effectively improving the durability of the durable soil matric potential detection device.

[0048] As shown in Figure 4 , the use method of the durable soil matric potential detection device is as follows:

[0049] S1, open the sealing cover 5, then fill the inside of the device with degassed distilled water, then cover the hole sealing plug, connect the air extractor to the hole sealing plug to extract air from the inside of the device, stop the air extraction when there is basically no bubble in the device, and immerse the ceramic head 101 end in the degassed distilled water, so that the water enters the device through the ceramic head 101, and the vacuum pressure gauge slowly returns to zero. After repeating the above steps three to four times, fill the inside of the device with degassed distilled water again and cover the sealing cover 5.

[0050] S2, the device filled with degassed distilled water and sealed in the air, so that the ceramic head 101 in the air evaporation, and observe the change of vacuum pressure gauge, when the vacuum pressure gauge reading changes very small over time, ceramic head 101 end immersed in degassed distilled water, so that water through the ceramic head 101 into the device, when the vacuum pressure gauge slowly back to zero, open the sealing cover 5, reusing degassed distilled water to fill the device and cover the sealing cover 5.

[0051] S3, repeat step S2 until the device is observed in the process of standing the vacuum pressure gauge can reach-90kPa, at this time using degassed distilled water to fill the device, cover the sealing cover 5, the ceramic head 101 immersed in degassed distilled water, ready for use.

[0052] It should be noted that the durable soil matric potential detection device needs to be wrapped with wet paper towel and wrapped with plastic wrap to keep the ceramic head 101 moist before installation in the field;

[0053] S4, in the field using a soil drill with a diameter greater than the diameter of the ceramic head 101, drill a vertical hole in the soil to be measured, the depth is determined by the crop root system or research needs, then remove the soil drill, the ceramic head 101 is vertically inserted into the hole drilled by the soil drill, when the lower end of the ceramic head 101 is in full contact with the soil of the soil to be measured, pour mud into the gap between the hole and the ceramic head, then fill the remaining gap of the hole with fine soil, after 24 hours, the device and the soil reach water balance, the matric potential data of the soil to be measured is collected.

[0054] Specifically, the degassed distilled water is prepared by vacuum pump pumping method and boiling method.

[0055] The above specific embodiments are preferred embodiments of the present application, and cannot limit the present application, any changes or other equivalent replacement methods without departing from the technical scheme of the present application, are included in the protection scope of the present application.

Claims

1. A durable soil matric potential sensing device, characterized by, The application relates to a ceramic head mechanism, a sealing connector, a pressure detection module, a polycarbonate tube, a gas collecting tube and a sealing cover, wherein the ceramic head mechanism comprises a ceramic head and ceramic head reinforcing pieces; the ceramic head is in a round-bottom tubular structure, and a test cavity is arranged in the ceramic head; the ceramic head reinforcing pieces are multiple in number, are arranged in the side wall of the ceramic head, and are uniformly distributed along the central axis of the ceramic head. The upper end of the sealing connector is detachably connected with the lower end of the polycarbonate tube, a connecting cavity is arranged in the lower end of the sealing connector, the upper end of the ceramic head is provided with a connecting section, and the ceramic head is arranged in the connecting cavity through the connecting section; the upper end of the gas collecting tube is connected with the sealing cover, the lower end of the gas collecting tube is connected with the upper end of the polycarbonate tube, and the pressure detection module is arranged on one side of the gas collecting tube.

2. The durable soil matric potential sensing device of claim 1, wherein, The ceramic head comprises a connecting section and a main body section, the connecting section and the main body section are coaxially arranged, the lower surface of the connecting section is connected with the upper surface of the main body section, the diameters of the lower surface of the connecting section and the upper surface of the main body section are the same, and the cross-section diameter of the connecting section gradually decreases from the lower end to the upper end.

3. The durable soil matric potential sensing device of claim 2, wherein, The diameter of the lower surface of the connecting section is 1mm larger than the diameter of the upper surface of the connecting section.

4. The ruggedized soil matric potential sensing device of claim 1, wherein, The ceramic head is made of superfine alumina powder or quartz powder as skeleton material.

5. The ruggedized soil matric potential sensing device of claim 1, wherein, The ceramic head reinforcing pieces are parallel to the central axis of the ceramic head.

6. The ruggedized soil matric potential sensing device of claim 1, wherein, The ceramic head reinforcing pieces and the sealing connector are made of stainless steel.

7. The ruggedized soil matric potential sensing device of claim 1, wherein, The upper end of the sealing connector is provided with internal threads, and the sealing connector is screw-connected with the lower end of the polycarbonate tube through the internal threads.

8. The ruggedized soil matric potential sensing device of claim 1, wherein, The side wall of the gas collecting tube is provided with an interface, and the pressure detection module is arranged at the interface.

9. The ruggedized soil matric potential sensing device of claim 1, wherein, The application further comprises a soil drill, the bottom of the soil drill is provided with a drill bit, and the diameter of the drill bit is larger than that of the ceramic head.

10. The ruggedized soil matric potential sensing device of claim 1, wherein, The pressure detection module is a mechanical vacuum pressure gauge or a pressure sensor.

Images