阅读说明：本技术 一种具有保护功能的稳定型土壤湿度计 (Stable form soil hygrometer with protect function ) 是由 方彐云 于 2019-09-16 设计创作，主要内容包括：本发明涉及一种具有保护功能的稳定型土壤湿度计,包括主体和探头,还包括触发机构和至少两个支撑机构,支撑机构包括滑杆、第一弹簧、滑动套管、传动杆、连接管、第二丝杆和定位组件,定位组件包括支撑套管、第二弹簧和支撑杆,触发机构包括导向杆、驱动组件、第一丝杆、移动块、第二齿轮、两个接触开关和至少两个触发组件,触发组件包括支架、电磁铁和永磁铁,该具有保护功能的稳定型土壤湿度计中,通过各支撑机构对主体的支撑作用,提高了土壤湿度计的稳定性,当土壤湿度计的探头置于土壤中时间过长的时候,通过触发机构可以触发支撑机构,则通过支撑机构将土壤湿度计从土壤中取出,降低了土壤湿度计发生损坏的几率。(The invention relates to a stable soil hygrometer with a protection function, which comprises a main body, a probe, a trigger mechanism and at least two support mechanisms, wherein the support mechanism comprises a sliding rod, a first spring, a sliding sleeve, a transmission rod, a connecting pipe, a second lead screw and a positioning assembly, the positioning assembly comprises a support sleeve, a second spring and a supporting rod, the trigger mechanism comprises a guide rod, a driving assembly, a first lead screw, a moving block, a second gear, two contact switches and at least two trigger assemblies, the trigger assemblies comprise a bracket, an electromagnet and a permanent magnet, the stability of the soil hygrometer is improved through the support effect of each support mechanism on the main body, when the probe of the soil hygrometer is placed in soil for too long time, the support mechanisms can be triggered through the trigger mechanisms, and the soil hygrometer is taken out of the soil through the support mechanisms, the probability of damage to the soil hygrometer is reduced.)

1. The stable soil hygrometer with the protection function comprises a main body (1) and a probe (6), wherein the main body (1) is cylindrical, the main body (1) and the probe (6) are coaxially arranged, and the bottom end of the main body (1) is fixedly connected with the top end of the probe (6), and the stable soil hygrometer is characterized by further comprising a triggering mechanism and at least two supporting mechanisms, wherein the supporting mechanisms are circumferentially and uniformly arranged on the periphery of the main body (1) around the axis of the main body (1), the triggering mechanism is arranged inside the main body (1), and the triggering mechanism is connected with the supporting mechanisms;

the supporting mechanism comprises a sliding rod (2), a first spring (10), a sliding sleeve (3), a transmission rod (4), a connecting pipe (5), a second lead screw (11) and a positioning assembly, the sliding rod (2) is parallel to the axis of the main body (1), fixed blocks are arranged at the two ends of the sliding rod (2), the two ends of the sliding rod (2) are respectively fixedly connected with the two ends of one side, close to the sliding rod (2), of the main body (1) through the fixed blocks, the sliding rod (2) and the sliding sleeve (3) are coaxially arranged, the sliding rod (2) penetrates through the sliding sleeve (3), the sliding sleeve (3) is slidably connected with the sliding rod (2), the first spring (10) is sleeved on the sliding rod (2), the top end of the sliding rod (2) is fixedly connected with the sliding sleeve (3) through the first spring (10), and the first spring (10) is in a compression state, the top end of the connecting pipe (5) is hinged to the bottom end of one side, close to the sliding rod (2), of the main body (1), the second lead screw (11) is coaxially arranged with the connecting pipe (5), an inner thread matched with the second lead screw (11) is arranged on the inner wall of the connecting pipe (5), the second lead screw (11) is matched with the connecting pipe (5), one end of the second lead screw (11) is arranged inside the connecting pipe (5), the second lead screw (11) is in threaded connection with the connecting pipe (5), one end of the transmission rod (4) is hinged to the sliding sleeve (3), the other end of the transmission rod (4) is hinged to the middle of the connecting pipe (5), the positioning assembly is arranged on the sliding sleeve (3), and the positioning assembly is connected with the sliding rod (2);

the positioning component comprises a supporting sleeve (17), a second spring (21) and a supporting rod (22), the axis of the supporting sleeve (17) is vertical to and intersected with the axis of the lifting sleeve, one end of the supporting sleeve (17) is fixedly connected with the lifting sleeve, the supporting sleeve (17) is communicated with the interior of the lifting sleeve, the supporting rod (22) is matched with the supporting sleeve (17) and is coaxially arranged, one end of the supporting rod (22) is arranged inside the supporting sleeve (17), one end of the supporting rod (22) is connected with the sliding rod (2), the supporting rod (22) is connected with the supporting sleeve (17) in a sliding way, the second spring (21) is sleeved on the supporting rod (22), the other end of the supporting rod (22) is fixedly connected with the supporting sleeve (17) through a second spring (21), and the second spring (21) is in a stretching state;

the trigger mechanism comprises a guide rod (8), a driving assembly, a first lead screw (7), a moving block (9), a second gear (15), two contact switches (14) and at least two trigger assemblies, wherein the guide rod (8) is perpendicular to and intersected with the axis of the main body (1), two ends of the guide rod (8) are fixedly connected with the inner wall of the main body (1), the first lead screw (7) is parallel to the guide rod (8), two ends of the first lead screw (7) are respectively provided with a mounting bearing, two ends of the first lead screw (7) are respectively connected with the inner wall of the main body (1) through the mounting bearings, the two contact switches (14) are respectively fixedly connected with two ends of the guide rod (8), two through holes are arranged in the moving block (9), the first lead screw (7) and the guide rod (8) both penetrate through the moving block (9), and the moving block (9) is connected with the guide rod (8) in a sliding manner, the movable block (9) is in threaded connection with the first lead screw (7), the second gear (15) is installed at one end of the first lead screw (7), the driving assembly is arranged on the inner wall of the main body (1), the driving assembly is connected with the second gear (15), the number of the triggering assemblies is equal to that of the sliding sleeves (3), the triggering assemblies correspond to the sliding sleeves (3) one to one, the triggering assemblies are arranged on the sliding sleeves (3), and the triggering assemblies are connected with the supporting rod (22).

2. The stabilized soil hygrometer with the protection function as claimed in claim 1, wherein a PLC is disposed inside the main body (1), a display screen and at least two control buttons are disposed on a top end of the main body (1), and the display screen, the two contact switches (14) and each control button are electrically connected to the PLC.

3. The stabilized soil hygrometer with protection function as claimed in claim 1, wherein said driving assembly comprises a motor (13) and a first gear (12), said motor (13) being fixedly connected to the inner wall of the main body (1), said motor (13) being in transmission connection with the first gear (12), said first gear (12) being in mesh with a second gear (15).

4. The stabilized soil hygrometer with the protection function as claimed in claim 1, wherein the trigger assembly comprises a bracket (18), an electromagnet (20) and a permanent magnet (19), the permanent magnet (19) is fixedly connected to an end of the support rod (22) far away from the slide bar (2), the electromagnet (20) is disposed on a side of the permanent magnet (19) far away from the support rod (22), and the electromagnet (20) is fixedly connected to the sliding sleeve (3) through the bracket (18).

5. The stabilized soil hygrometer with protection as claimed in claim 1, wherein said guide rod (8) is coated with grease.

6. The stabilized soil hygrometer with protection function as claimed in claim 3, wherein said motor (13) is a servo motor.

7. The stabilized soil hygrometer as claimed in claim 1, wherein the second lead screw (11) is made of stainless steel.

8. The stabilized soil hygrometer with protection as claimed in claim 1, wherein said connection tube (5) is coated with an anti-corrosion coating.

9. The stabilized soil hygrometer with protection as claimed in claim 1, wherein a rubber block is provided on the end of the support rod (22) close to the slide rod (2), said rubber block abutting against the slide rod (2).

10. The stabilized soil hygrometer as claimed in claim 1, wherein a non-slip pad (16) is disposed on an end of the second lead screw (11) remote from the connecting tube (5).

Technical Field

The invention relates to the field of soil detection equipment, in particular to a stable soil hygrometer with a protection function.

Background

The soil hygrometer measurement principle is that the real moisture content of various soils can be directly and stably reflected by measuring the dielectric constant of the soil. The calibration mode adopts a comparison method to measure the volume percentage of soil moisture which is irrelevant to the mechanism of the soil. The data acquisition mode can adopt a manual reading mode for acquisition. The method is mainly applied to the application fields of landslide, roadbed, agriculture, foundation pit, reservoir area, laboratory and the like.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, the stable soil hygrometer with the protection function is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: a stable soil hygrometer with a protection function comprises a main body and a probe, wherein the main body is cylindrical, the main body and the probe are coaxially arranged, the bottom end of the main body is fixedly connected with the top end of the probe, the stable soil hygrometer further comprises a trigger mechanism and at least two support mechanisms, each support mechanism is uniformly arranged on the periphery of the main body in the circumferential direction around the axis of the main body, the trigger mechanism is arranged inside the main body, and the trigger mechanism is connected with each support mechanism;

the supporting mechanism comprises a sliding rod, a first spring, a sliding sleeve, a transmission rod, a connecting pipe, a second lead screw and a positioning assembly, wherein the sliding rod is parallel to the axis of the main body, fixed blocks are arranged at the two ends of the sliding rod, the two ends of the sliding rod are respectively fixedly connected with the two ends of one side, close to the sliding rod, of the main body through the fixed blocks, the sliding rod and the sliding sleeve are coaxially arranged, the sliding rod penetrates through the sliding sleeve, the sliding sleeve is slidably connected with the sliding rod, the first spring is sleeved on the sliding rod, the top end of the sliding rod is fixedly connected with the sliding sleeve through the first spring, the first spring is in a compression state, the top end of the connecting pipe is hinged with the bottom end of one side, close to the sliding rod, of the main body, the second lead screw and the connecting pipe are coaxially arranged, an internal thread matched with, one end of the second screw rod is arranged inside the connecting pipe, the second screw rod is in threaded connection with the connecting pipe, one end of the transmission rod is hinged to the sliding sleeve, the other end of the transmission rod is hinged to the middle of the connecting pipe, the positioning assembly is arranged on the sliding sleeve, and the positioning assembly is connected with the sliding rod;

the positioning assembly comprises a supporting sleeve, a second spring and a supporting rod, the axis of the supporting sleeve is perpendicular to and intersected with the axis of the lifting sleeve, one end of the supporting sleeve is fixedly connected with the lifting sleeve, the supporting sleeve is communicated with the interior of the lifting sleeve, the supporting rod is matched with the supporting sleeve and coaxially arranged with the supporting sleeve, one end of the supporting rod is arranged in the supporting sleeve, one end of the supporting rod is connected with a sliding rod, the supporting rod is slidably connected with the supporting sleeve, the second spring is sleeved on the supporting rod, the other end of the supporting rod is fixedly connected with the supporting sleeve through the second spring, and the second spring is in a stretching state;

the trigger mechanism comprises a guide rod, a driving component, a first lead screw, a moving block, a second gear, two contact switches and at least two trigger components, wherein the guide rod is perpendicular to and intersected with the axis of the main body, two ends of the guide rod are fixedly connected with the inner wall of the main body, the first lead screw is parallel to the guide rod, two ends of the first lead screw are respectively provided with a mounting bearing, two ends of the first lead screw are respectively connected with the inner wall of the main body through the mounting bearings, the two contact switches are respectively fixedly connected with two ends of the guide rod, two through holes are arranged in the moving block, the first lead screw and the guide rod both penetrate through the moving block, the moving block is connected with the guide rod in a sliding manner, the moving block is in threaded connection with the first lead screw, the second gear is mounted on one end of the first lead screw, the driving component is arranged on the inner wall of the main body, and the driving component is connected with the, the number of the trigger assemblies is equal to that of the sliding sleeves, the trigger assemblies correspond to the sliding sleeves one by one, the trigger assemblies are arranged on the sliding sleeves, and the trigger assemblies are connected with the supporting rods.

Preferably, in order to improve the degree of automation of soil hygrometer, the inside of main part is equipped with PLC, be equipped with display screen and two at least control button on the top of main part, display screen, two contact switch and each control button all are connected with PLC electricity.

Preferably, in order to provide power for the first screw rod, the driving assembly comprises a motor and a first gear, the motor is fixedly connected with the inner wall of the main body, the motor is in transmission connection with the first gear, and the first gear is meshed with the second gear.

Preferably, in order to provide power for the supporting rod, the triggering assembly comprises a support, an electromagnet and a permanent magnet, the permanent magnet is fixedly connected with one end, far away from the sliding rod, of the supporting rod, the electromagnet is arranged on one side, far away from the supporting rod, of the permanent magnet, and the electromagnet is fixedly connected with the sliding sleeve through the support.

Preferably, the guide bar is coated with grease in order to improve the smoothness of movement of the moving block.

Preferably, in order to improve the accuracy of the control of the rotation speed of the first screw rod, the motor is a servo motor.

Preferably, in order to prolong the service life of the second screw rod, the second screw rod is made of stainless steel.

Preferably, in order to prolong the service life of the connecting pipe, the connecting pipe is coated with an anti-corrosion coating.

Preferably, in order to improve the firmness of the connection between the support rod and the slide rod, one end of the support rod, which is close to the slide rod, is provided with a rubber block, and the rubber block is abutted against the slide rod.

Preferably, in order to improve the stability of the second screw rod, an anti-slip pad is arranged on one end of the second screw rod, which is far away from the connecting pipe.

The invention has the advantages that in the stable soil hygrometer with the protection function, the probability of toppling of the soil hygrometer is reduced and the stability of the soil hygrometer is improved through the supporting effect of each supporting mechanism on the main body, through the mutual matching of the plurality of supporting mechanisms, the number of supporting points of the soil hygrometer is increased, the stability of the soil hygrometer is improved, when the probe of the soil hygrometer is placed in the soil for too long, the supporting mechanism can be triggered by the triggering mechanism, the soil hygrometer is taken out of the soil through the supporting mechanism, the probability of damage to the soil hygrometer is reduced, compared with the existing triggering mechanism, the linkage between the trigger mechanism and the supporting mechanism is realized, so that the trigger mechanism is not required to be provided with a redundant actuating mechanism, and the production cost of the soil hygrometer is reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of a stabilized soil hygrometer with protection of the present invention;

FIG. 2 is a cross-sectional view of a stabilized soil hygrometer having a protection feature in accordance with the present invention;

FIG. 3 is a schematic structural view of the support mechanism of the stabilized soil hygrometer with protection of the present invention;

FIG. 4 is a schematic diagram of the trigger mechanism of the stabilized soil hygrometer with protection of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 2;

in the figure: 1. the automatic measuring device comprises a main body, a sliding rod 2, a sliding sleeve 3, a transmission rod 4, a connecting pipe 5, a probe 6, a first lead screw 7, a guide rod 8, a moving block 9, a first spring 10, a second lead screw 11, a first gear 12, a motor 13, a contact switch 14, a second gear 15, an anti-slip pad 16, a support sleeve 17, a support 18, a permanent magnet 19, an electromagnet 20, a second spring 21 and a support rod 22.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1-2, a stable soil hygrometer with protection function includes a main body 1 and a probe 6, wherein the main body 1 is cylindrical, the main body 1 and the probe 6 are coaxially disposed, a bottom end of the main body 1 is fixedly connected to a top end of the probe 6, and the stable soil hygrometer further includes a triggering mechanism and at least two supporting mechanisms, each supporting mechanism is circumferentially and uniformly disposed on an outer periphery of the main body 1 around an axis of the main body 1, the triggering mechanism is disposed inside the main body 1, and the triggering mechanism is connected to each supporting mechanism;

after operating personnel inserts probe 6 inside soil, through the supporting role of each supporting mechanism to main part 1, reduced the probability that the soil hygrometer took place to empty, improved the stability of soil hygrometer, when probe 6 of soil hygrometer placed in soil for a long time, can trigger supporting mechanism through trigger mechanism, then take out the soil hygrometer from soil through supporting mechanism, reduced the probability that the soil hygrometer takes place to damage.

As shown in fig. 3, the supporting mechanism includes a sliding rod 2, a first spring 10, a sliding sleeve 3, a transmission rod 4, a connection pipe 5, a second lead screw 11 and a positioning assembly, the sliding rod 2 is parallel to the axis of the main body 1, fixing blocks are arranged at both ends of the sliding rod 2, both ends of the sliding rod 2 are respectively fixedly connected with both ends of one side of the main body 1 close to the sliding rod 2 through the fixing blocks, the sliding rod 2 and the sliding sleeve 3 are coaxially arranged, the sliding rod 2 passes through the sliding sleeve 3, the sliding sleeve 3 is slidably connected with the sliding rod 2, the first spring 10 is sleeved on the sliding rod 2, the top end of the sliding rod 2 is fixedly connected with the sliding sleeve 3 through the first spring 10, the first spring 10 is in a compressed state, the top end of the connection pipe 5 is hinged with the bottom end of one side of the main body 1 close to the sliding rod 2, the second lead screw, an internal thread matched with a second screw rod 11 is arranged on the inner wall of the connecting pipe 5, the second screw rod 11 is matched with the connecting pipe 5, one end of the second screw rod 11 is arranged inside the connecting pipe 5, the second screw rod 11 is in threaded connection with the connecting pipe 5, one end of the transmission rod 4 is hinged to the sliding sleeve 3, the other end of the transmission rod 4 is hinged to the middle of the connecting pipe 5, the positioning assembly is arranged on the sliding sleeve 3 and connected with the sliding rod 2;

as shown in fig. 5, the positioning assembly includes a supporting sleeve 17, a second spring 21 and a supporting rod 22, the axis of the supporting sleeve 17 is perpendicular to and intersects with the axis of the lifting sleeve, one end of the supporting sleeve 17 is fixedly connected with the lifting sleeve, the supporting sleeve 17 is communicated with the inside of the lifting sleeve, the supporting rod 22 is matched with and coaxially arranged with the supporting sleeve 17, one end of the supporting rod 22 is arranged inside the supporting sleeve 17, one end of the supporting rod 22 is connected with the sliding rod 2, the supporting rod 22 is slidably connected with the supporting sleeve 17, the second spring 21 is sleeved on the supporting rod 22, the other end of the supporting rod 22 is fixedly connected with the supporting sleeve 17 through the second spring 21, and the second spring 21 is in a stretching state;

an operator manually pulls the support rod 22 to move along the support sleeve 17 in a direction away from the slide rod 2, so that the slide sleeve 3 is separated from the slide rod 2, then the operator manually rotates the connecting pipe 5, the slide sleeve 3 is driven to move along the slide rod 2 through the transmission rod 4, when the connecting pipe 5 rotates in place, the operator loosens the support rod 22, the support rod 22 is driven to move in a direction close to the slide rod 2 through the second spring 21, so that the support rod 22 abuts against the slide rod 2, so that the slide sleeve 3 is fixedly connected with the slide rod 2, and further the connection pipe 5 is positioned through the transmission rod 4, if the second lead screw 11 does not abut against soil at the moment, the operator can move the second lead screw 11 along the connecting pipe 5 by rotating the second lead screw 11, and can abut against the soil through adjusting the second lead screw 11, under the support effect of the second lead screw 11 and the connecting pipe 5, the stability of the soil hygrometer is improved;

as shown in fig. 4-5, the trigger mechanism includes a guide rod 8, a driving component, a first lead screw 7, a moving block 9, a second gear 15, two contact switches 14, and at least two trigger components, the guide rod 8 is perpendicular to and intersects with an axis of the main body 1, both ends of the guide rod 8 are fixedly connected with an inner wall of the main body 1, the first lead screw 7 is parallel to the guide rod 8, both ends of the first lead screw 7 are provided with mounting bearings, both ends of the first lead screw 7 are connected with an inner wall of the main body 1 through the mounting bearings, the two contact switches 14 are respectively fixedly connected with both ends of the guide rod 8, two through holes are arranged inside the moving block 9, the first lead screw 7 and the guide rod 8 both pass through the moving block 9, the moving block 9 is slidably connected with the guide rod 8, the moving block 9 is threadedly connected with the first lead screw 7, the second gear 15 is mounted on one end of the first lead screw 7, the driving assembly is arranged on the inner wall of the main body 1 and connected with the second gear 15, the number of the triggering assemblies is equal to that of the sliding sleeves 3, the triggering assemblies correspond to the sliding sleeves 3 one by one, the triggering assemblies are arranged on the sliding sleeves 3 and connected with the supporting rod 22;

the driving assembly provides power to drive the second gear 15 to rotate, the second gear 15 drives the first lead screw 7 to rotate, the first lead screw 7 drives the moving block 9 to move along the guide rod 8, the driving assembly controls the rotating speed of the second gear 15, the rotating speed of the first lead screw 7 can be controlled, and further the moving speed of the moving block 9 can be controlled, the length of the guide rod 8 is unchanged, the time required for the moving block 9 to move from one end of the guide rod 8 to the other end can be controlled by controlling the moving speed of the moving block 9, a timing function is realized, after an operator inserts the probe 6 of the soil hygrometer into soil, the operator controls the moving block 9 to start moving, the moving block 9 moves from one end of the guide rod 8 to the other end within a set time, the contact switch 14 is triggered by the moving block 9, and the contact switch 14 sends a pulse electric signal to the PLC, after the PLC receives the signal, the PLC controls the trigger assembly to be electrified, the support rod 22 is separated from the slide rod 2 through the trigger assembly, the slide sleeve 3 is pushed to move downwards along the slide rod 2 through the first spring 10, the connecting pipe 5 is driven to rotate downwards through the slide sleeve 3, the main body 1 is upwards supported through the second lead screw 11, the probe 6 is separated from soil, the probability of damage of a soil hygrometer is reduced, the moving block 9 is enabled to trigger one of the contact switches 14 through the two contact switches 14, the reset is carried out without reverse movement, when timing is needed again, only the reverse movement is needed, and the other contact switch 14 is triggered.

Preferably, in order to improve the automation degree of the soil hygrometer, a PLC is arranged inside the main body 1, a display screen and at least two control keys are arranged on the top end of the main body 1, and the display screen, the two contact switches 14 and the control keys are electrically connected with the PLC;

the PLC is a programmable logic controller, which adopts a programmable memory for storing programs therein, executes instructions facing users such as logic operation, sequence control, timing, counting, arithmetic operation and the like, controls various types of machinery or production processes through digital or analog input/output, is a computer specially used for industrial control in essence, has a hardware structure basically the same as that of a microcomputer, is generally used for data processing and instruction receiving and outputting and is used for realizing central control, an operator sends a control signal to the PLC through a control key, the PLC controls the operation of the soil hygrometer, and simultaneously, the working state of the soil hygrometer can be displayed through a display screen, so that the automation degree of the soil hygrometer is improved.

As shown in fig. 4, the driving assembly comprises a motor 13 and a first gear 12, the motor 13 is fixedly connected with the inner wall of the main body 1, the motor 13 is in transmission connection with the first gear 12, and the first gear 12 is meshed with a second gear 15;

the first gear 12 is driven to rotate by the motor 13, and the second gear 15 is driven to rotate by the first gear 12.

As shown in fig. 5, the triggering assembly includes a bracket 18, an electromagnet 20 and a permanent magnet 19, the permanent magnet 19 is fixedly connected with one end of the support rod 22 far away from the slide rod 2, the electromagnet 20 is arranged on one side of the permanent magnet 19 far away from the support rod 22, and the electromagnet 20 is fixedly connected with the sliding sleeve 3 through the bracket 18;

when the moving block 9 triggers the contact switch 14, the contact switch 14 sends a pulse electric signal to the PLC, after the PLC receives the signal, the PLC controls the electromagnet 20 to be electrified, the stability of the electromagnet 20 is improved through the bracket 18, and then the electromagnet 20 attracts the permanent magnet 19 to be close to the electromagnet 20, so that the supporting rod 22 is separated from the sliding rod 2.

Preferably, in order to improve the smoothness of the movement of the moving block 9, the guide rod 8 is coated with grease;

the friction between the moving block 9 and the guide bar 8 is reduced by the grease, and the smoothness of movement of the moving block 9 is improved.

Preferably, the motor 13 is a servo motor in order to improve the accuracy of the control of the rotation speed of the first screw 7.

Preferably, in order to prolong the service life of the second screw rod 11, the second screw rod 11 is made of stainless steel;

the stainless steel has better corrosion resistance, so that the corrosion speed of the second screw rod 11 is reduced, and the service life of the second screw rod 11 is prolonged.

Preferably, in order to prolong the service life of the connecting pipe 5, the connecting pipe 5 is coated with an anti-corrosion coating;

the corrosion speed of the connecting pipe 5 is slowed down through the anti-corrosion coating, and the service life of the connecting pipe 5 is prolonged.

Preferably, in order to improve the firmness of the connection between the support rod 22 and the slide rod 2, a rubber block is arranged at one end of the support rod 22 close to the slide rod 2, and the rubber block is abutted against the slide rod 2;

the friction force between the support rod 22 and the slide rod 2 is increased through the rubber block, and the firmness of the connection between the support rod 22 and the slide rod 2 is improved.

Preferably, in order to improve the stability of the second screw rod 11, an anti-slip pad 16 is arranged on one end of the second screw rod 11 away from the connecting pipe 5;

the skid-proof pad 16 reduces the skid probability of the second screw rod 11 and improves the stability of the second screw rod 11.

An operator manually pulls the support rod 22 to separate the sliding sleeve 3 from the slide rod 2, then the operator manually rotates the connecting pipe 5, the sliding sleeve 3 is driven to move along the slide rod 2 through the transmission rod 4, when the connecting pipe 5 rotates in place, the operator loosens the support rod 22, the support rod 22 is driven to move towards the direction close to the slide rod 2 through the second spring 21, the support rod 22 is abutted against the slide rod 2, the sliding sleeve 3 is fixedly connected with the slide rod 2, and then the positioning of the connecting pipe 5 is realized through the transmission rod 4, if the second lead screw 11 is not abutted against soil at the moment, the operator can rotate the second lead screw 11 to move the second lead screw 11 along the connecting pipe 5, through the adjustment of the second lead screw 11, the second lead screw 11 can be abutted against soil, and under the supporting action of the second lead screw 11 and the connecting pipe 5, the stability of the soil hygrometer is improved, after an operator inserts the probe 6 of the soil hygrometer into soil, the operator controls the moving block 9 to start moving through the driving assembly, the moving block 9 moves to the other end from one end of the guide rod 8 within a set time, the triggering assembly is triggered to be powered on, the supporting rod 22 is separated from the sliding rod 2 through the triggering assembly, the sliding sleeve 3 is pushed to move downwards along the sliding rod 2 through the first spring 10, the connecting pipe 5 is driven to rotate downwards through the sliding sleeve 3, the main body 1 is upwards supported through the second lead screw 11, the probe 6 is separated from the soil, and the probability of damage of the soil hygrometer is reduced.

Compared with the prior art, the stable soil hygrometer with the protection function has the advantages that the probability of toppling of the soil hygrometer is reduced and the stability of the soil hygrometer is improved through the supporting effect of the supporting mechanisms on the main body 1, through the mutual matching of the plurality of supporting mechanisms, the number of supporting points of the soil hygrometer is increased, the stability of the soil hygrometer is improved, when the probe 6 of the soil hygrometer is placed in the soil for too long, the supporting mechanism can be triggered through the triggering mechanism, the soil hygrometer is taken out of the soil through the supporting mechanism, the probability of damage to the soil hygrometer is reduced, compared with the existing triggering mechanism, the linkage between the trigger mechanism and the supporting mechanism is realized, so that the trigger mechanism is not required to be provided with a redundant actuating mechanism, and the production cost of the soil hygrometer is reduced.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.