CN116539848B

CN116539848B - Soil pH value detection device

Info

Publication number: CN116539848B
Application number: CN202310826572.4A
Authority: CN
Inventors: 田东利
Original assignee: Shenhexin Technology Group Co ltd
Current assignee: Shenhexin Technology Group Co ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2023-08-25
Anticipated expiration: 2043-07-07
Also published as: CN116539848A

Abstract

The invention relates to the technical field of agricultural soil detection, in particular to a soil pH value detection device which comprises a plurality of groups of pH value detectors, wherein a driving system for driving the pH value detectors to move forwards is arranged on the same side of each group of pH value detectors, a detection system for driving each group of pH value detectors to move up and down is arranged between each group of pH value detectors and the driving system, and a low-position proximity switch and a high-position proximity switch are arranged on one side of the driving system at intervals. According to the invention, the driving system and the detection system are arranged on one side of crops, and the detection system can be stopped at fixed time by utilizing the function of detecting metal objects by the high-low proximity switch in the driving system, so that the PH value detector can complete lifting reciprocating movement, further automatically insert soil detection and then transmit the soil detection to a computer to obtain targeted fertilization, thereby improving soil.

Description

Soil pH value detection device

Technical Field

The invention relates to the technical field of agricultural soil detection, in particular to a soil pH value detection device.

Background

The internet of things technology connects wireless transmission equipment, detection equipment and a computer together through a wireless network, so that detection data is obtained, and then the places needing treatment are reflected through analysis and processing of the computer. The utility model discloses a crops are planted and are liked and are slightly acidic soil, need use pH valve detector to detect soil before planting, and then fertilize and improve, and it is microcomputer type top-grade instrument and built-in wireless transmission module can conveniently be linked into the computer and monitor and acquire data. However, after crops are planted, soil nutrients are drawn along with the growth of the crops, so that the pH value of the soil is changed, if the pH value is not found in time, the healthy growth of the crops can be influenced, and people only hold the pH value detector to insert and detect the soil around the crops, so that the labor intensity is high, a large amount of time is consumed, and the efficient management of agriculture is not facilitated.

Disclosure of Invention

The invention aims to provide a soil pH value detection device for solving the problems in the background technology.

In order to achieve the above purpose, the invention provides a soil pH value detection device, which comprises a plurality of groups of pH value detectors, wherein a driving system for driving the pH value detectors to move forward is arranged on the same side of each group of pH value detectors, a detection system for driving each group of pH value detectors to reciprocate up and down is arranged between each group of pH value detectors and the driving system, the driving system consists of a plurality of screw rods connected end to end in a straight line and a servo motor for driving the screw rods to rotate, one side of each screw rod is provided with a low-position proximity switch at intervals for controlling the servo motor to start in a delayed manner, the detection system comprises a sliding seat moving along the central axis direction of the screw rods, a lifting rod arranged on one side of each pH value detector and a forward and backward rotation motor for driving the lifting rod to move forward and backward, one side of each screw rod is provided with a high-position proximity switch for controlling the forward and backward rotation of the forward and backward rotation motor, one side of each high-position proximity switch is positioned on one side of the low-position proximity switch and far away from the servo motor, one side of the sliding seat is provided with a transmission belt and a transmission wheel for directly driving the lifting rod to move, one end of the metal rod is continuously driven by the sliding seat, and the metal rod is continuously arranged in the sliding seat is provided with a high-position proximity switch for driving the metal rod.

As a further improvement of the technical scheme, a square column is arranged at the center of one end of the screw rod, a square hole is formed in the center of the other end of the screw rod, and two adjacent screw rods are coaxially connected through the insertion connection of the square column and the square hole.

As a further improvement of the technical scheme, a through hole with internal threads is formed in the center of one end of the sliding seat and is in threaded connection with the screw rod, a guide sleeve is arranged on one side of the sliding seat, and a guide rod sleeved with the guide sleeve is suspended on one side of the screw rod.

As a further improvement of the technical scheme, the other side integrated into one piece of sliding seat is equipped with the saddle that is used for placing positive and negative rotation motor, the outer end both sides integrated into one piece of saddle is equipped with the extension rod that is used for supporting the lifter motion, saddle top surface just is located its length direction both ends department with the counter bore has all been seted up to extension rod outer end department top surface.

As a further improvement of the technical scheme, the bearing is embedded in the counter bore and is adhered to the bottom surface of the corresponding driving wheel, wherein one driving wheel above the supporting table is coaxially connected with the forward and reverse rotating motor, and the bottom end of the output shaft of the forward and reverse rotating motor is tightly sleeved with the corresponding bearing.

As a further improvement of the technical scheme, a plurality of transmission teeth are arranged on the inner side of the transmission belt at equal intervals, conical teeth meshed with the transmission teeth are arranged on the inner side of the annular groove of the transmission wheel at equal intervals, pre-tightening columns are symmetrically arranged on the top surface of the outer end of the supporting table, and the pre-tightening columns are located on the outer side of the transmission belt.

As a further improvement of the technical scheme, a plurality of threaded columns which are in threaded connection with the driving wheel correspondingly are arranged on the bottom surface of the lifting rod, and the height of each threaded column is larger than that of the sliding seat from the ground.

As the further improvement of this technical scheme, the top surface of sliding seat is equipped with long frame cover, long frame cover is sealed towards high-order proximity switch one end and is run through by the metal pole, the middle part of aggravating the wheel is equipped with the ring channel, the one end of metal pole be equipped with aggravate the split ring of wheel middle part joint, the outside cover of metal pole is equipped with the spring, the length of metal pole is greater than high-order proximity switch and low-order proximity switch's interval.

As a further improvement of the technical scheme, a fixed frame sleeved with the PH value detector is arranged on one side of the lifting rod, and the length of a probe of the PH value detector is greater than that of the threaded column.

As a further improvement of the technical scheme, the two ends of the guide rod are respectively provided with a convex column and a concave hole, two adjacent guide rods are coaxially connected through the insertion connection of the convex columns and the concave holes, each group of guide rods is sleeved with a supporting seat at the butt joint end of each guide rod, and a supporting plate is arranged below each guide rod.

Compared with the prior art, the invention has the beneficial effects that:

1. in this soil pH valve detection device, through set up a row of actuating system in crops one side, and set up the detecting system who moves along its extending direction on actuating system, install the pH valve detector in detecting system and move thereupon, utilize the detection metal object of high low order proximity switch in the actuating system and switch on and off function in addition, make detecting system can stop regularly, let the pH valve detector accomplish the lift round trip movement, and then insert soil detection voluntarily, utilize wireless transmission module to the computer transmission detect soil pH valve data, people are according to the analysis of computer and the fertilization of pertinence, thereby improve soil, its degree of automation is high, and has spreading value.

2. In this soil pH valve detection device, through set up the metal pole that can slide in detecting system's sliding seat, it utilizes inertia and obtains the power of sliding after detecting system stops, and then is close to high-order proximity switch, triggers detecting system work, its design benefit has practical value.

3. In this soil pH valve detection device, through the segmentation butt joint with the lead screw in the actuating system, and can not lead to the middle part to drop because of the overlength, when it does benefit to its extension, also does benefit to and bears detecting system steady slip.

Drawings

FIG. 1 is a schematic view of the overall assembly structure of embodiment 1;

FIG. 2 is a schematic view of a partially assembled driving system of embodiment 1;

FIG. 3 is a lead screw assembly split view of example 1;

FIG. 4 is a schematic diagram of a partially assembled structure of the detection system of the embodiment 1;

fig. 5 is a schematic view of a sliding seat structure of embodiment 1;

FIG. 6 is a schematic diagram of an assembled belt structure of the embodiment 1;

FIG. 7 is an assembled and disassembled view of the weight wheel of example 1;

FIG. 8 is a circuit diagram of a servo motor and low-order proximity switch control circuit of embodiment 1;

fig. 9 is a circuit diagram of the forward/reverse rotation motor and the high-order proximity switch control circuit of embodiment 1.

The meaning of each reference sign in the figure is:

100. a drive system;

110. a screw rod; 111. square columns; 112. square holes; 120. a servo motor; 130. a low-order proximity switch;

140. a high-order proximity switch; 150. a guide rod; 151. a convex column; 152. concave holes; 160. a support base; 170. a support plate;

200. a detection system;

210. a sliding seat; 211. a guide sleeve; 212. a support; 213. an extension rod; 214. countersink; 215. pre-tightening the column; 216. a long frame sleeve; 217. a weight wheel; 218. a metal rod; 219. a spring;

220. a transmission belt; 221. a drive tooth; 230. a forward and reverse rotation motor; 240. a driving wheel; 241. conical teeth;

250. a lifting rod; 251. a threaded column; 252. a fixed frame;

300. and a PH value detector.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "central axis," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, in the description of the invention, the meaning of "a number" is two or more, unless explicitly defined otherwise.

Example 1

Referring to fig. 1 to 9, the present invention provides a soil ph detecting device, which includes several groups of ph detectors 300, and is formed into an intelligent control system of internet of things by a wireless network and an intelligent control system, wherein the intelligent control system utilizes a wireless network to transmit signals, and utilizes computer control to set a numerical alert value to alert people of insufficient ph of soil, so as to take the next step of targeted fertilization. The same side of each group of PH value detectors 300 is provided with a driving system 100 for driving the PH value detectors to move forward, a detection system 200 for driving each group of PH value detectors 300 to move up and down is arranged between each group of PH value detectors 300 and the driving system 100, the PH value detectors 300 are driven by the driving system 100 to move to the soil where crops are located, then the PH value detectors are driven by the detection system 200 to be inserted into the soil for soil PH value detection, and detection data are transmitted to a computer by a wireless network for processing and analyzing, so that the PH value imbalance of the soil near the crops is known, and fertilization treatment is carried out on the crop. The driving system 100 is composed of a plurality of screw rods 110 connected end to end in a straight line and a servo motor 120 for driving the screw rods 110 to rotate, and considering the length of the range for planting crops, the screw rods 110 are divided into a plurality of sections to be butted into a whole, which is beneficial to the stable movement of the support detection system 200. One side of each screw rod 110 is provided with a low-level proximity switch 130 at intervals for controlling the delay start of the servo motor 120, so that when the detection system 200 approaches to the detection range of the low-level proximity switch 130, the servo motor 120 stops, and then the operation is restarted after a period of time delay, and the detection system 200 is driven to continuously move forward to detect the soil in the next range. The internal circuit of the proximity switch consists of a high-frequency oscillator circuit, a voltage doubling rectifying circuit and an electronic switch circuit. Proximity switch circuit theory of operation: when the metal object is not close to the detection probe (the high-frequency transformer of the high-frequency oscillator circuit is used as the detection probe to detect the metal object), the high-frequency oscillator oscillates and works, the output oscillation signal is subjected to voltage doubling rectification by the voltage doubling rectifying circuit to generate voltage so that the electronic switch is in a closed state, namely the proximity switch does not work, when the metal object is close to the detection probe, eddy current loss is generated, the high-frequency oscillator stops vibrating, the diode of the electronic switch is lighted, and in an on state, namely the proximity switch starts to work to turn on the circuit where the electronic switch is positioned.

The starting and stopping process of the servo motor 120 is as follows: referring to fig. 8, a time relay KT1 is used as a time control element, a rotary switch S is turned on, a coil of a low-order proximity switch 130 (hereinafter abbreviated as SQ (low-order)) is powered on, an SQ (low-order) normally open contact is closed, so that the time relay KT1 is powered on, a servo motor 120 (hereinafter abbreviated as M1) is powered on to drive a detection system 200 to move, when the detection system 200 approaches the low-order proximity switch 130, the SQ (low-order) is turned off, the M1 is powered off to stop, and due to the delay effect of the KT1, the normally open and delay closed contact of the time relay KT1 is closed, the M1 is powered on to continuously drive the detection system 200 to move to the next low-order proximity switch 130, and is started and stopped according to the above process.

The detection system 200 comprises a sliding seat 210 moving along the central axis direction of the screw rod 110, lifting rods 250 arranged on one side of a plurality of pH value detectors 300 and used for driving the lifting rods 250 to lift, forward and reverse rotation motors 230 used for driving the lifting rods 250 to lift, high-position proximity switches 140 used for controlling the forward and reverse rotation of the forward and reverse rotation motors 230 are arranged on one side of each screw rod 110 at intervals, after the high-position proximity switches 140 detect that the detection system 200 is close, the forward and reverse rotation motors 230 are automatically controlled to complete one forward and reverse rotation according to the circuit control principle shown in fig. 9, so that the lifting rods 250 are driven to complete one lifting, and after the probe rods of the pH value detectors 300 are inserted into soil to measure data, the probe rods are lifted and returned along with the lifting rods 250. The high-order proximity switch 140 is located on one side of the low-order proximity switch 130 and is far away from the servo motor 120, a driving belt 220 and a driving wheel 240 for directly driving the lifting rod 250 to move are arranged on one side of the sliding seat 210, a metal rod 218 for approaching the high-order proximity switch 140 is arranged in the top of the sliding seat 210, one end of the metal rod 218 is connected with a weighting wheel 217 which can drive the metal rod 218 to continuously move forward after the sliding seat 210 stops, the weighting wheel 217 is made of iron, when the sliding seat 210 stops, the weighting wheel 217 obtains larger inertia by utilizing the self mass, the weighting wheel continuously moves forward, the metal rod 218 is driven to move forward, the metal rod 218 is driven to approach the high-order proximity switch 140 to be detected, and the high-order proximity switch 140 is triggered to be closed to drive the forward and backward motor 230 to automatically move forward and backward.

In this embodiment, the sliding seat 210 is made of plastic, and a metal pin is embedded at the front end of the sliding seat facing the low-level proximity switch 130, so that the sliding seat is detected by the low-level proximity switch 130 and is triggered to be turned off.

The process of the automatic forward and backward rotation of the forward and backward rotation motor 230 is as follows: as shown in fig. 9, time relays KT1 and KT2 are used as time control elements, and intermediate relays KA1 and KA2 play an intermediate control role. The power switch Q and the rotary switch S are turned on (the rotary switch S is turned on when the servo motor 120 is stopped), the coil of the high-order proximity switch 140 (hereinafter abbreviated as SQ (high-order)) is powered, the normally open contact of the SQ (high-order) is closed, the time relay KT1 is powered, and the intermediate relay KA1 is powered and attracted. The contactor KM1 is powered and engaged, and the forward/reverse motor 230 (hereinafter referred to as M2) operates in a forward limit. Because the servo motor 120 stops, the metal rod 218 protrudes to be close to the high-order proximity switch 140, sq (high-order) is disconnected, in addition, because of the delay action of the relay KT1, the forward and reverse rotation motor 230 finishes forward rotation at the time and drives the lifting rod 250 to descend, and then drives the probe rod of the ph detector 300 to be inserted into soil for detection, when the delay time is up, the normally closed delay disconnection contact of the time relay KT1 is disconnected, so that the intermediate relay KA1 is disconnected, the contact KA1 is disconnected, the coil of the contactor KM1 is disconnected, the main contact KM1 is disconnected, and the M2 stops forward rotation instantaneously.

When the normally-closed time-delay opening contact of the time relay KT1 is opened, the normally-open time-delay closing contact KT1 is closed, the intermediate relay KA2 is temporarily electrified and attracted, the normally-open contact is closed and self-locked, the time relay KT2 is electrified, the contactor KM2 is electrified and attracted, and the M2 operates in a reverse time limit. Due to the time delay effect of the relay KT2, the forward and reverse rotation motor 230 finishes reversing at the time to drive the lifting rod 250 to lift, so that the probe rod of the PH value detector 300 is driven to lift and return, when the time delay time is up, the normally closed time delay disconnection contact of the time relay KT2 is disconnected, the intermediate relay KA2 is disconnected, the contact KA2 is disconnected, the coil of the contactor KM2 is disconnected, the main contact KM2 is disconnected, and the reversing is stopped instantaneously by M2.

The delay time of KT1 in fig. 8 is greater than or equal to the delay time of KT1 and KT2 in fig. 9, so that the servo motor 120 delays the starting time period, and the forward and reverse rotation motor 230 can complete the forward and reverse rotation round trip, that is, the ph detector 300 is guaranteed to complete one soil insertion detection. After the detection system 200 walks through the screw rod 110 where the detection system is positioned, two rotary switches S are closed, and the servo motor 120 is started to rotate reversely to drive the detection system 200 to retract.

Specifically, a square column 111 is disposed at the center of one end of the screw rod 110, a square hole 112 is disposed at the center of the other end of the screw rod 110, and two adjacent screw rods 110 are coaxially connected by plugging the square column 111 and the square hole 112, so that the two adjacent screw rods 110 synchronously rotate by matching the square column 111 and the square hole 112.

Specifically, a through hole with an internal thread is provided at the center of one end of the sliding seat 210 and is in threaded connection with the screw rod 110, a guide sleeve 211 is provided at one side of the sliding seat 210, wherein a metal pin is embedded at the outer side of the front end of the guide sleeve 211 for approaching to the low-level proximity switch 130 to trigger the disconnection thereof, and a guide rod 150 sleeved with the guide sleeve 211 is suspended at one side of the screw rod 110 for limiting the sliding seat 210 to move along the central axis direction of the screw rod 110.

Further, the other side integrated into one piece of the sliding seat 210 is provided with a supporting platform 212 for placing the forward and reverse rotation motor 230, two sides of the outer end of the supporting platform 212 are integrated into one piece and provided with extension rods 213 for supporting the lifting rod 250 to move, counter bores 214 are formed on the top surface of the supporting platform 212 and located at two ends in the length direction of the supporting platform and the top surface of the outer end of the extension rods 213, namely, the supporting platform is formed by a plurality of counter bores 214 to form a T shape for being spread, and the supporting platform is favorable for stable lifting of the lifting rod 250.

Further, the counter bore 214 is embedded with a bearing, and the bearing is adhered to the bottom surface of the corresponding driving wheel 240, so that the inner ring of the driving wheel 240 stably rotates and the whole body does not slip. Wherein a driving wheel 240 above the supporting stand 212 is coaxially connected with the forward and reverse rotation motor 230, and the bottom end of the output shaft of the forward and reverse rotation motor 230 is tightly sleeved with a corresponding bearing, so that the forward and reverse rotation motor 230 works reversely and stably.

In addition, a plurality of transmission teeth 221 are arranged on the inner side of the transmission belt 220 at equal intervals, conical teeth 241 meshed with the transmission teeth 221 are arranged on the inner side of the annular groove of the transmission wheel 240 at equal intervals, pre-tightening columns 215 are symmetrically arranged on the top surface of the outer end of the supporting table 212, and the pre-tightening columns 215 are positioned on the outer side of the transmission belt 220, so that the bent transmission belt 220 is in a tight state, is tightly attached to the transmission wheel 240, and is beneficial to power transmission.

Specifically, the bottom surface of the lifting rod 250 is provided with a plurality of threaded columns 251 which are in threaded connection with the driving wheel 240 correspondingly, and as the plurality of counter bores 214 are in T-shaped spreading, the plurality of threaded columns 251 are lifted side by side, so that the whole pH value detector 300 is lifted synchronously, the height of the threaded columns 251 is greater than the height of the sliding seat 210 from the ground, the emptying height of the pH value detector 300 is high from the ground, and the soil cannot be contacted during transverse movement, so that unnecessary detection is caused.

Further, the top surface of the sliding seat 210 is provided with a long frame sleeve 216, one end of the long frame sleeve 216 facing the high-order proximity switch 140 is closed and penetrated by a metal rod 218, so that the metal rod 218 moves stably, an annular groove is arranged in the middle of the weighting wheel 217, one end of the metal rod 218 is provided with an opening ring which is clamped with the middle of the weighting wheel 217, a spring 219 is sleeved on the outer side of the metal rod 218, the inner end of the spring 219 is adhered to the closed end of the long frame sleeve 216, the metal rod 218 is promoted to return, and the length of the metal rod 218 is larger than the distance between the high-order proximity switch 140 and the low-order proximity switch 130. When the sliding seat 210 stops, the weight wheel 217 obtains larger inertia by utilizing its own mass, and then continues to roll forward, so as to drive the metal rod 218 to move forward, and then approach the high-level proximity switch 140 to be detected, so as to trigger the high-level proximity switch 140 to close and drive the forward and reverse motor 230 to automatically move forward and backward.

Specifically, a fixed frame 252 sleeved with the PH value detector 300 is arranged on one side of the lifting rod 250, so that the PH value detector 300 is convenient to disassemble, assemble and maintain. The length of the probe of the ph detector 300 is longer than the length of the screw column 251, so that the probe of the ph detector 300 can be smoothly inserted into the soil.

In addition, two ends of the guide rod 150 are respectively provided with a convex column 151 and a concave hole 152, and two adjacent guide rods 150 are coaxially connected through the insertion connection of the convex column 151 and the concave hole 152, so that the two adjacent guide rods 150 are coaxial, and the smooth transition of the guide sleeve 211 is facilitated. The butt joint ends of each group of screw rods 110 and guide rods 150 are sleeved with a supporting seat 160, a supporting plate 170 is arranged below the screw rods 110, the supporting plate 170 is buried in a soil layer to be stable, and the servo motor 120, the low-position proximity switch 130 and the high-position proximity switch 140 above the supporting plate 170 are stably placed through bolt fixation.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a soil pH valve detection device, includes a plurality of groups pH valve detector (300), its characterized in that: each group of pH value detectors (300) is provided with a driving system (100) for driving the pH value detectors (300) to move forwards, a detection system (200) for driving each group of pH value detectors (300) to move up and down is arranged between each group of pH value detectors (300) and each driving system (100) and comprises a plurality of screw rods (110) connected end to end in a straight line and a servo motor (120) for driving the screw rods (110) to rotate, one side of each screw rod (110) is provided with a low-position proximity switch (130) for controlling the servo motor (120) to start in a delayed mode at intervals, each detection system (200) comprises a sliding seat (210) moving along the axis direction of the screw rods (110), a lifting rod (250) arranged on one side of each pH value detector (300) and used for driving the lifting rod (250) to lift, a forward and reverse motor (230) used for driving the lifting rod (250) to lift, one side of each screw rod (110) is provided with a high-position proximity switch (140) for controlling the forward and reverse motor (230) to rotate at intervals, the high-position proximity switch (110) is arranged on one side of the sliding seat (210) and is provided with a driving wheel (240) and a driving seat (240) to move directly, a metal rod (218) which is used for approaching to the high-position proximity switch (140) is arranged in the top of the sliding seat (210), and one end of the metal rod (218) is connected with a weighting wheel (217) which can drive the metal rod (218) to continuously move forward after the sliding seat (210) stops.

2. The soil ph detecting device according to claim 1, wherein: the screw rod (110) is characterized in that a square column (111) is arranged at the center of one end of the screw rod (110), a square hole (112) is formed in the center of the other end of the screw rod (110), and two adjacent screw rods (110) are coaxially connected with the square hole (112) through the square column (111) in a plugging mode.

3. The soil ph detecting device according to claim 1, wherein: the guide rod is characterized in that a through hole with internal threads is formed in the center of one end of the sliding seat (210), the through hole is in threaded connection with the screw rod (110), a guide sleeve (211) is arranged on one side of the sliding seat (210), and a guide rod (150) sleeved with the guide sleeve (211) is suspended on one side of the screw rod (110).

4. The soil ph detecting device according to claim 1, wherein: the opposite side integrated into one piece of sliding seat (210) is equipped with saddle (212) that are used for placing positive and negative rotation motor (230), the outer end both sides integrated into one piece of saddle (212) is equipped with extension rod (213) that are used for supporting lifter (250) motion, saddle (212) top surface just is located its length direction both ends department with counter bore (214) have all been seted up to extension rod (213) outer end department top surface.

5. The soil ph detecting device according to claim 4, wherein: the counter bore (214) is internally embedded with a bearing, the bearing is adhered to the bottom surface of the corresponding driving wheel (240), one driving wheel (240) above the supporting table (212) is coaxially connected with the forward and reverse rotation motor (230), and the bottom end of the output shaft of the forward and reverse rotation motor (230) is tightly sleeved with the corresponding bearing.

6. The soil ph detecting device according to claim 5, wherein: the inside equidistant a plurality of driving teeth (221) that are equipped with of drive belt (220), the ring channel inboard of drive wheel (240) is annular equidistant be equipped with driving teeth (221) engaged conical tooth (241), the outer end top surface symmetry of saddle (212) is equipped with pretension post (215), pretension post (215) are located the outside of drive belt (220).

7. The soil ph detecting device according to claim 1, wherein: the bottom surface of lifter (250) is equipped with a plurality of screw thread posts (251) with drive wheel (240) corresponding threaded connection, the height of screw thread post (251) is greater than the height that sliding seat (210) left the ground.

8. The soil ph detecting device according to claim 1, wherein: the top surface of sliding seat (210) is equipped with long frame cover (216), long frame cover (216) are closed towards high-order proximity switch (140) one end and are run through by metal pole (218), the middle part of aggravating wheel (217) is equipped with the ring channel, the one end of metal pole (218) be equipped with the split ring of aggravating wheel (217) middle part joint, the outside cover of metal pole (218) is equipped with spring (219), the length of metal pole (218) is greater than the interval of high-order proximity switch (140) and low-order proximity switch (130).

9. The soil ph detecting device according to claim 7, wherein: one side of the lifting rod (250) is provided with a fixed frame (252) sleeved with the PH value detector (300), and the length of a probe rod of the PH value detector (300) is greater than that of the threaded column (251).

10. The soil ph detecting device according to claim 3, wherein: two ends of the guide rod (150) are respectively provided with a convex column (151) and a concave hole (152), two adjacent guide rods (150) are coaxially connected through the insertion connection of the convex columns (151) and the concave holes (152), each group of guide rods (110) and the butt joint ends of the guide rods (150) are respectively sleeved with a supporting seat (160), and a supporting plate (170) is arranged below the guide rods (110).