CN116953270A - Full-automatic soil organic matter detection device with liquid adding digestion titration function and control method thereof - Google Patents

Abstract

The invention relates to a full-automatic soil organic matter detection device with a liquid adding digestion titration function and a control method thereof, which solve the defects that oil bath digestion possibly causes high-temperature injury and manual titration is extremely easy to cause errors compared with the prior art. The invention comprises a welding frame, wherein a triaxial module and a working area are arranged in the welding frame, and the invention further comprises a liquid adding digestion titration module arranged in the welding frame, wherein the liquid adding digestion titration module and the working area are positioned in the movement track range of the triaxial module. The invention integrates the functions of carrying, adding liquid, resolving, flushing, titration and measuring, and can provide rapid, high-precision and large-batch detection service; the defect that the full-automatic detection device for the soil organic matters cannot be carried out yet is overcome, the full-automatic detection device can be suitable for detection work of large-batch single heavy soil organic matters, can save the labor capacity of operators, and improves the treatment efficiency.

Description

Full-automatic soil organic matter detection device with liquid adding digestion titration function and control method thereof

Technical Field

The invention relates to the technical field of detection equipment for soil component organic matters, in particular to a full-automatic detection device for soil organic matters with a liquid adding digestion titration function and a control method thereof.

Background

Soil organic matters are important factors for forming a soil structure, and have important effects on improving physical and chemical properties of soil and promoting nutrient absorption of crops. The content of soil organic matters is one of important indexes for measuring soil fertility and quality. The large field area of China is wide, the types of soil are many, the types and the number of soil samples to be detected are numerous, the task is heavy, and the time is short. Whether the content of soil organic matters can be rapidly and accurately measured has important significance in soil fertility evaluation.

The soil organic matter measuring method includes instrument measuring method and chemical oxidizing method. The instrument measuring method comprises a carbon and nitrogen element analyzer method, a near infrared spectrum analysis method and the like, and has the advantages of being rapid, efficient and good in test reproducibility, and particularly the near infrared spectrum analysis method can be used for in-situ detection, so that rapid development is achieved. However, the instrument determination method is used for detecting the soil organic matters, an accurate model is required to be established to calculate the organic matter content, and the physical characteristics of the soil sample are complicated to cause a lot of interference to detection, so that the current near infrared spectroscopy detection technology is difficult to obtain reliable data, and the analysis instrument is high in price, high in operation technical requirement, high in analysis cost and unsuitable for field use; the chemical oxidation method is to oxidize organic carbon with oxidant at certain temperature and then to measure the amount of oxidant consumed and convert the amount into the amount of organic carbon.

In national standard, the conventional method is adopted to detect soil organic matters by soil testing and formulated fertilization, so that accurate and reliable data can be obtained to guide fertilization. However, when the organic matter content of soil is measured by this method, there are the following problems: (1) The process is complicated, auxiliary experimental equipment and equipment are more, and the occupied space is large; (2) The process is complex, so that the labor intensity of the test by the testers is high; (3) The measurement time is long, the error of artificial measurement is extremely easy to generate due to energy consumption, and the batch detection of samples under the same condition in the true sense is difficult to realize;

(4) The pretreatment solvent has pungent smell and toxicity, and the human body harm can be generated if a tester operates improperly in the operation process; (5) The oil bath process generates high temperature, personal injury is brought to operators by a little carelessness, and residual oil stains on the container are difficult to clean; (6) The manual titration is extremely easy to cause errors and has high requirements on the technical level of testers.

Therefore, the automatic device which adopts graphite furnace digestion to replace oil bath digestion and machine judgment titration to replace manual titration and integrates carrying, liquid adding, digestion, flushing, titration and measurement into a whole can be used for detecting soil organic matters.

Disclosure of Invention

The invention aims to solve the defects that in the prior art, oil bath digestion possibly brings high-temperature damage and manual titration is extremely easy to cause errors, and provides a full-automatic soil organic matter detection device with a liquid adding digestion titration function and a control method thereof to solve the problems.

In order to achieve the above object, the technical scheme of the present invention is as follows:

the full-automatic soil organic matter detection device with the liquid adding, digestion and titration functions comprises a welding frame, wherein a triaxial module and a working area are arranged in the welding frame, the full-automatic soil organic matter detection device further comprises a liquid adding, digestion and titration module arranged in the welding frame, and the liquid adding, digestion and titration module and the working area are positioned in the movement track range of the triaxial module;

the liquid adding digestion titration module comprises a bottom plate, a graphite digestion position and a liquid adding titration position are arranged on the bottom plate,

the liquid adding titration position comprises two hole sites, one is a liquid adding position, the other is a titration position, glass sample bottles are placed on the liquid adding position and the titration position, a stirring motor is fixed below the liquid adding position and the titration position, the stirring motor comprises a motor, two magnets with opposite magnetic poles are arranged on an output shaft of the motor, steering gears are respectively arranged beside the liquid adding position and the titration position, a liquid adding pipe and a burette are arranged on the steering gears, the liquid adding pipe and the burette are driven to rotate to the position above the liquid adding position and the titration position respectively when the steering gears work, the titration position for liquid adding positioning is in a hollowed-out design, a white area light source and a camera are respectively arranged on two sides of the titration position, the camera is arranged on a bottom plate, the white area light source is arranged on the drip positioning, a camera protection cover is arranged at the front part of the camera, and light of the white area light source passes through the glass sample bottles through the hollowed-out design of the drip positioning and irradiates on a lens of the camera;

the graphite digestion site include that the graphite of N hole site is cleared up stove and N+1 is cleared up the lid, and graphite is cleared up stove and is cleared up the lid and arrange side by side, installs the upper cover plate on the graphite digestion stove, is cleared up the lid and installs on the upper cover plate.

Still include liquid way module, reagent bottle holder and automatically controlled module, liquid way module, reagent bottle holder and automatically controlled module all install in welding frame, liquid way module clear up titration module to the liquid feeding and carry out liquid way conduction, automatically controlled module clear up titration module to triaxial module, liquid feeding and carry out circuit control.

The working space comprises a table top, a plurality of container frames and a limiting strip, wherein the table top is provided with positioning pins and shielding strips, the shielding strips are arranged around the table top and around holes, each container frame is composed of three layers of panels with array holes, the panel at the lowest layer is provided with positioning holes, and the containers frames are distributed on the table top in an array mode.

The triaxial module comprises a X, Y, Z linear module in three directions, namely an X-axis module, a Y-axis module and a Z-axis module, which are mutually perpendicular;

the X-axis module comprises a linear module I, a driving motor I, a connecting plate I, a synchronous wheel set, a tensioning plate I, a supporting upright post, a side rod and a tensioning disc, and is arranged on the base through the supporting upright post;

the Y-axis module comprises a first connecting seat, a second linear module, a second driving motor, a second connecting plate, a second tensioning plate, a supporting bearing, four roll shafts and a first outer cover, wherein the Y-axis module is connected with the X-axis module through the first connecting seat, the supporting bearing is formed by connecting a large bearing and two small bearings through spring steel sheets, is in triangular distribution, has an elastic reset function, is arranged at the top end of the Y-axis module and is used for leveling the Y-axis module, the four roll shafts are used for installing shielding cloth, one end of the shielding cloth is connected with a side rod at one side of the X-axis module, the middle of the shielding cloth penetrates through the four roll shafts, and is finally connected with a tensioning disc for tensioning;

the Z-axis module comprises a linear module III, a driving motor III, a connecting seat II, an electric claw and a housing II, wherein four stainless steel columns, an adapter plate and a flushing head are fixed on the electric claw, the four stainless steel columns are used for grabbing containers in a working area, the flushing head is used for flushing and cooling the containers, and a plurality of long waist holes are formed in the housing II and used for pumping and exhausting harmful gases.

A control method of a full-automatic soil organic matter detection device with a liquid adding digestion titration function comprises the following steps:

preparation: preparing reagents required by detection according to requirements by operators, wherein the reagents comprise potassium dichromate-sulfuric acid solution, ferrous sulfate solution, phenanthroline solution and water, the potassium dichromate-sulfuric acid solution is placed in a water bath, the ferrous sulfate solution, the phenanthroline solution and the water are placed on a reagent bottle rack, and soil samples about 0.3g are weighed and placed in glass sample bottles in a working area;

starting detection and starting the device:

the triaxial module moves to the first glass sample bottle, the electric claw clamps the container to move to the liquid adding position, and the steering engine drives the liquid adding pipe to swing to the upper part of the container to add potassium dichromate-sulfuric acid solution;

the electric claw clamps the glass sample bottles back to the original position, the liquid adding of the second glass sample bottle is started, the electric claw moves the first glass sample bottle to the graphite digestion position for digestion when the third container is added, the electric claw continues to add liquid to other containers during the period, and meanwhile the second glass sample bottle and the third glass sample bottle are moved to the graphite digestion position;

after the digestion of the first glass sample bottle is completed, the electric claw moves the first glass sample bottle to the original position, and the flushing head is used for flushing and cooling the first glass sample bottle;

after the cooling time is up, the electric claw is moved to a titration position, a white area light source and a camera are started, a steering engine drives a burette to perform titration, three drops of phenanthroline solution are added, ferrous sulfate solution is then added, the camera records and judges the color of the liquid in the container in real time,

when the liquid color is judged to be changed from blue-green to brown-red, the titration is finished, the number of drops is recorded, the result is calculated, the above work is sequentially repeated to finish the detection of the soil samples in all containers, and finally the organic matter content of the soil samples is presented in a form of a table.

Advantageous effects

Compared with the prior art, the full-automatic soil organic matter detection device with the liquid adding digestion titration function and the control method thereof solve the problems that high temperature burn is likely to be caused by oil bath, cleaning is difficult and errors are caused by manual titration.

The invention integrates the functions of carrying, adding liquid, resolving, flushing, titration and measuring, and can provide rapid, high-precision and large-batch detection service; the defect that the full-automatic detection device for the soil organic matters cannot be carried out yet is overcome, the full-automatic detection device can be suitable for detection work of large-batch single heavy soil organic matters, can save the labor capacity of operators, and improves the treatment efficiency.

Drawings

FIG. 1 is a schematic diagram of a core detection structure of the present invention;

FIGS. 2a and 2b are schematic views of an overall structure switch door according to the present invention;

FIG. 3 is a schematic view of a triaxial module structure according to the present invention;

FIG. 4 is a schematic view of an X-axis module according to the present invention;

FIG. 5 is a schematic diagram of a Y-axis module structure according to the present invention;

FIG. 6 is a schematic view of a Z-axis module (with a housing) according to the present invention;

FIG. 7 is a schematic view of a Z-axis module (without a housing) according to the present invention;

FIG. 8 is a schematic view of a support bearing structure according to the present invention;

FIG. 9 is a schematic view of the structure of the electric claw in the present invention;

FIG. 10 is a schematic diagram of a liquid-fed digestion titration module (with housing) according to the present invention;

FIG. 11 is a schematic diagram of a liquid-fed digestion titration module (without a housing) according to the present invention;

FIG. 12 is a schematic diagram of a liquid-fed digestion titration module (without a housing) according to the present invention;

FIG. 13 is a cross-sectional view of the positioning of a drop in accordance with the present invention;

fig. 14 is a schematic view of a working space structure in the present invention.

FIG. 15 is a schematic view of the structure of the container rack of the present invention;

FIG. 16 is a schematic diagram of an electronic control module according to the present invention;

FIG. 17 is a schematic view of a hydraulic circuit module according to the present invention;

FIG. 18 is a schematic view of a reagent bottle holder according to the present invention;

FIG. 19 is a partial schematic view of drop placement according to the present invention;

FIG. 20 is a flow chart of a control method of the present invention;

wherein 1, a welding frame, 2, a triaxial module, 3, a heating condensing module, 4, a working area, 5, an electric control module, 6, a liquid path module, 7, a reagent bottle rack, 8, a water bath, 10, square steel, 11, a side-by-side door, 12, an upper door, 13, a side plate, 14, a base, 15, a fan, 20, an X-axis module, 21, a Y-axis module, 22, a Z-axis module, 31, a bottom plate, 32, a housing, 33, a drop adding positioning, 34, a graphite digestion site, 35, an upper cover plate, 36, a liquid adding site, 37, a titration site, 38, a stirring motor, 39, a motor, 40, a magnet, 41, a white surface light source, 42, a camera shield, 43, a camera, 44, a steering engine, 45, a liquid adding tube, 46, a titration tube, 47, a graphite digestion furnace, 48, a digestion cover, 49, a shielding ring, 50, a table top, 51, a container rack, 52, and a limit bar, 53, dowel pins, 54, shade strips, 55, panels, 56, locating holes, 57, electrical control plates, 58, control elements, 59, spacer plates, 60, fixed plates, 61, pump frames, 62, pumps, 201, linear modules one, 202, drive motors one, 203, connecting plates one, 204, synchro pulley sets, 205, tension plates one, 206, support posts, 207, side bars, 208, tension discs, 211, connection blocks one, 212, linear modules two, 213 drive motors two, 214, connecting plates two, 215, tension plates two, 216, support bearings, 217, rollers, 218, housing one, 219, spring steel plates, 221, linear modules three, 222, drive motors three, 223, connection blocks two, 224, electrical pawls, 225, housing two, 226, stainless steel posts, 227, connecting plates 228, rinse heads, 229, glass sample bottles.

Detailed Description

For a further understanding and appreciation of the structural features and advantages achieved by the present invention, the following description is provided in connection with the accompanying drawings, which are presently preferred embodiments and are incorporated in the accompanying drawings, in which:

as shown in fig. 1, 2a and 2b, the full-automatic soil organic matter detection device based on machine vision provided by the invention comprises a welding frame 1, a triaxial module 2, a liquid adding digestion titration module 3, a working area 4, an electric control module 5, a liquid path module 6 and a reagent bottle rack 7. The welding frame 1 comprises square steel 10, a side-by-side door 11, an upward door 12, side plates 13 and a base 14; the base 14 is fixedly arranged in the middle of the welding frame 1; a fan 15 is fixed on the side plate 13 and is used for connecting with a vent of a detection place to pump and exhaust harmful gas in the device; the liquid path module 6, the reagent bottle rack 7 and the water bath kettle 8 are fixed below the welding frame.

As shown in fig. 3, 4, 5, 6, 7, 8 and 9, the triaxial module includes a rectilinear module in X, Y, Z three directions, namely an X-axis module 20, a Y-axis module 21 and a Z-axis module 22, which are perpendicular to each other; the X-axis module 20 consists of a linear module I201, a driving motor I202, a connecting plate I203, a synchronous wheel group 204, a tensioning plate I205, a supporting upright post 206, a side rod 207 and a tensioning disc 208; the X-axis module 20 is mounted on the base 14 through a support column 206; the Y-axis module 21 comprises a first connecting seat 211, a second linear module 212, a second driving motor 213, a second connecting plate 214, a second tensioning plate 215, a supporting bearing 216, 4 roll shafts 217 and a first outer cover 218; the Y-axis module is connected with the X-axis module 20 through a first connecting seat 211; the supporting bearing 216 is formed by connecting a large bearing and two small bearings through a spring steel sheet 219, is distributed in a triangular shape, has an elastic resetting function, is arranged at the top end of the Y-axis module 21 and is used for leveling the Y-axis module 21; the 4 roll shafts 217 are used for installing a shielding cloth, one end of the shielding cloth is connected with a side rod 207 on one side of the X-axis module, the middle of the shielding cloth passes through the 4 roll shafts 217, and finally, the shielding cloth is connected with a tensioning disc 208 for tensioning; the Z-axis module 22 comprises a third linear module 221, a third driving motor 222, a second connecting seat 223, an electric claw 224 and a second outer cover 225; the electric claw 224 is fixed with 4 stainless steel columns 226, an adapter plate 227 and a flushing head 228; the 4 stainless steel columns 226 are used for grabbing glass sample bottles 229 in a working space; the flushing head 228 is used for flushing and cooling the glass sample bottle 229; the second outer cover 225 has a plurality of long waist holes for exhausting the harmful gas.

As shown in fig. 10, 11, 12, 13 and 19, the liquid adding digestion titration module 3 comprises a bottom plate 31, an outer cover 32, a liquid adding drop positioning 33, a graphite digestion position 34 and an upper cover plate 35, and the design uses a graphite digestion furnace to replace an oil bath pot, so that potential damage to operators caused by high temperature of the oil bath is greatly reduced, and the complicated process of cleaning oil stains is omitted.

The outer cover 32, the drop adding positioning 33 and the graphite digestion position 34 are arranged on the bottom plate 31; the upper cover plate 35 is arranged above the outer cover 32; the liquid drop adding positioning 33 consists of two hole sites, one is a liquid adding site 36 and the other is a titration site 37, and a stirring motor 38 is fixed below the liquid adding site 36 and the titration site 37 respectively; the stirring motor 38 consists of a motor 39 and two magnets 40 with opposite upper magnetic poles; the two sides of the titration position 37 penetrate through, one side is provided with a white area light source 41, one side is provided with a camera protective cover 42, the camera protective cover and the motor protective cover are opposite to each other and are provided with a camera 43, and the camera of the camera is opposite to a glass sample bottle 229 in the titration position 37; two steering engines 44 are arranged beside the liquid adding position 36 and the titration position 37, a liquid adding pipe 45 and a burette 46 are arranged on the steering engines 44, and pipelines are arranged in the steering engines; the steering engine 44 drives the liquid adding pipe 45 and the burette 46 to rotate above the liquid adding position 36 and the titration position 37 respectively during operation; the graphite digestion site 34 consists of 3 (N) hole site graphite digestion furnaces 47 and 4 (n+1) digestion covers 48; the digestion cover 48 is fixed on the upper cover plate 35; the upper cover plate 35 is provided with a plurality of holes, and a plurality of shielding rings 49 are arranged on the holes and used for preventing spilled liquid from flowing into the module.

Here, the titration position 37 of the drip positioning 33 is designed to be hollowed out, the white area light source 41 and the camera 43 are respectively installed on two sides of the drip positioning 37, the camera 43 is installed on the bottom plate 31, the white area light source 41 is installed on the drip positioning 33, the camera protection cover 42 is installed at the front part of the camera 43, the light of the white area light source 41 passes through the glass sample bottle 229 to be irradiated on the lens of the camera 43 through the hollowed-out design of the drip positioning 37, and thus, an imaging system is formed by utilizing the traditional vision technology: the light emitted by the white area light source 41 passes through the glass sample bottle 229 placed in the titration position 37 through the hollowed-out part, finally, the light is irradiated on the photosensitive element of the camera 43, and the camera 43 can photograph the glass sample bottle 229 and perform color judgment at regular intervals during working, so that the result error caused by manual judgment is greatly reduced.

As shown in fig. 14 and 15, the working space 4 comprises a table top 50, a plurality of container frames 51 and a limit strip 52; the table 50 is provided with a positioning pin 53 and a shielding strip 54, and the shielding strip 54 is arranged around the table 50 and around the hole site to prevent waste liquid generated by machine faults from flowing into the device; the container rack 51 is composed of three layers of panels 55 with array holes, the upper two layers have holes slightly larger than the containers, the lowest panel has positioning holes 56, and a plurality of container racks 51 are distributed in an array on the table 50.

As shown in fig. 16, the electronic control module 5 includes an electronic control board 57, driving elements and control elements 58 of various devices, and the like, and is mounted on a support column 206; meanwhile, the working space 4 and the electronic control module 5 are separated by the two separating plates 59, so that harmful gas is prevented from entering the electronic control module 5 to damage the module.

As shown in fig. 17, the liquid path module 6 includes a fixing plate 60, a pump frame 61, and various pumps 62, and is installed below the welding frame 1.

As shown in fig. 18, the reagent bottle holder 7 is formed by welding corrosion-resistant stainless steel, and a plurality of holes for placing reagent bottles are formed in the panel and are arranged below the welding frame 1.

The specific working mode of the full-automatic soil organic matter detection device based on machine vision is as follows:

(1) Preparation: the operator prepares the required reagents for detection according to the requirements, including potassium dichromate-sulfuric acid solution (for digestion), ferrous sulfate solution (for titration neutralization), phenanthroline solution (for titration indication) and water (for flushing and cooling the container), wherein the potassium dichromate-sulfuric acid solution is placed in a water bath 8, and the ferrous sulfate solution, the phenanthroline solution and the water are placed on a reagent bottle rack 7; soil samples weighing around 0.3g were placed in glass sample bottles 229 within working space 4.

(2) And (3) starting detection: and the starting device is used for starting the operation software to set, clicking the start, and starting the full-automatic detection flow, wherein the process is multithreaded. The method comprises the following steps: firstly, moving a triaxial module to a first glass sample bottle 229, clamping the glass sample bottle 229 by an electric claw 224 to move to a liquid adding position 36, driving a liquid adding pipe 45 to swing above the glass sample bottle 229 by a steering engine 44 to add a volume of potassium dichromate-sulfuric acid solution, then clamping the glass sample bottle 229 to the original position by the electric claw 224, starting the liquid adding of a second container, repeating the steps in sequence, when a third container is added, moving the first container to a graphite digestion position 34 by the electric claw, continuing to add liquid to other containers by the electric claw 224 during the digestion time, simultaneously moving the second container and the third container to the graphite digestion position 34, and after the digestion of the first container is completed, moving the first container to the original position by the electric claw 224, and simultaneously flushing and cooling the first container by a flushing head 228; after cooling for a certain time, the electric claw 224 moves to the titration position 36, the white area light source 41 and the camera 43 are started, the steering engine drives the burette to perform titration, 3 drops of phenanthroline solution are added firstly, ferrous sulfate solution is then added, the camera 43 judges the color of liquid in the container at any moment, when judging that the color of the liquid is changed from blue green to brown red, the titration is finished, the number of drops is recorded, the result is calculated, the above work is sequentially repeated to finish the detection of soil samples in all the containers, and finally the organic matter content of the soil samples is presented in a form of a table. The color judgment flow is shown in fig. 20.

The invention solves the defect that a full-automatic detection device for soil organic matters cannot be used. The invention is suitable for pretreatment work of large-batch and single heavy soil organic matter detection, can automate the manual process, achieves the purposes of reducing the manual labor amount and improving the treatment efficiency, saves the labor amount of operators and improves the treatment efficiency.

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 embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. Soil organic matter full-automatic checkout device with function is cleared up in liquid feeding, including welding frame (1), install triaxial module (2) and working interval (4), its characterized in that in welding frame (1): the device further comprises a liquid adding digestion titration module (3) arranged in the welding frame (1), wherein the liquid adding digestion titration module (3) and the working section (4) are positioned in the movement track range of the triaxial module (2);

the liquid adding digestion titration module (3) comprises a bottom plate (31), a graphite digestion position (34) and a liquid adding titration position (33) are arranged on the bottom plate (31),

the liquid adding titration position (33) comprises two hole sites, one is a liquid adding position (36), the other is a titration position (37), glass sample bottles (229) are respectively placed on the liquid adding position (36) and the titration position (37), a stirring motor (38) is fixed below the liquid adding position (36) and the titration position (37), the stirring motor (38) comprises a motor (39), two magnets (40) with opposite magnetic poles are arranged on an output shaft of the motor (39), steering gears (44) are respectively arranged beside the liquid adding position (36) and the titration position (37), a liquid adding pipe (45) and a buret (46) are respectively arranged on the steering gears (44), when the steering gears (44) work, the liquid adding pipe (45) and the buret (46) are respectively driven to rotate to the upper parts of the liquid adding position (36) and the titration position (37), the titration position (37) of the liquid adding titration position (33) is in a hollow design, a white surface light source (41) and a camera (43) are respectively arranged on two sides of the titration position (37), the camera (43) are arranged on a bottom plate (31), the white light source (41) is arranged on the front surface light source (33), the light of the white area light source (41) passes through the glass sample bottle (229) to be irradiated on the lens of the camera (43) through the hollowed-out design of the drop positioning (37);

graphite digestion position (34) including N hole site's graphite digestion stove (47) and N+1 digestion lid (48), graphite digestion stove (47) and digestion lid (48) arrange side by side, install upper cover plate (35) on graphite digestion stove (47), digestion lid (48) are installed on upper cover plate (35).

2. The full-automatic soil organic matter detection device with liquid adding digestion and titration functions according to claim 1, wherein: still include liquid way module (6), reagent bottle holder (7) and automatically controlled module (5), liquid way module (6), reagent bottle holder (7) and automatically controlled module (5) all install in welding frame (1), liquid way module (6) clear up titration module (3) to the liquid feeding and carry out liquid way conduction, automatically controlled module (5) clear up titration module (3) to triaxial module (2), liquid feeding and carry out circuit control.

3. The full-automatic soil organic matter detection device with liquid adding digestion and titration functions according to claim 1, wherein: the working area (4) comprises a table top (50), a plurality of container frames (51) and limiting strips (52), wherein positioning pins (53) and shielding strips (54) are arranged on the table top (50), the shielding strips (54) are arranged around the table top (50) and around holes, the container frames (51) are formed by three layers of array hole site panels (55), the lowest layer of panels are provided with positioning holes (56), and the container frames (51) are distributed on the table top (50) in an array mode.

4. The full-automatic soil organic matter detection device with liquid adding digestion and titration functions according to claim 1, wherein: the triaxial module (2) comprises linear modules in X, Y, Z directions, namely an X-axis module (20), a Y-axis module (21) and a Z-axis module (22), which are mutually perpendicular;

the X-axis module (20) comprises a first linear module (201), a first driving motor (202), a first connecting plate (203), a synchronous wheel set (204), a first tensioning plate (205), a supporting upright post (206), side rods (207) and a tensioning disc (208), and the X-axis module (20) is arranged on the base (14) through the supporting upright post (206);

the Y-axis module (21) comprises a first connecting seat (211), a second linear module (212), a second driving motor (213), a second connecting plate (214), a second tensioning plate (215), a supporting bearing (216), four roller shafts (217) and a first outer cover (218), wherein the Y-axis module is connected with the X-axis module (20) through the first connecting seat (211), the supporting bearing (216) is formed by connecting a large bearing and two small bearings through spring steel sheets (219), is in triangular distribution and has an elastic reset function, is installed at the top end of the Y-axis module (21) and is used for leveling the Y-axis module (21), the four roller shafts (217) are used for installing a shielding cloth, one end of the shielding cloth is connected with a side rod (207) at one side of the X-axis module, the middle of the shielding cloth penetrates through the four roller shafts (217), and finally is connected with a tensioning disc (208) for tensioning;

the Z-axis module (22) comprises a linear module III (221), a driving motor III (222), a connecting seat II (223), an electric claw (224) and a housing II (225), wherein four stainless steel columns (226), an adapter plate (227) and a flushing head (228) are fixed on the electric claw (224), the four stainless steel columns (226) are used for grabbing a container (229) in a working space, the flushing head (228) is used for flushing and cooling the container (229), and a plurality of long waist holes are formed in the housing II (225) and used for pumping and exhausting harmful gas.

5. The control method of the full-automatic soil organic matter detection device with the liquid adding digestion titration function as claimed in claim 1, which is characterized by comprising the following steps:

51 Preparation: preparing reagents required by detection according to requirements by operators, wherein the reagents comprise potassium dichromate-sulfuric acid solution, ferrous sulfate solution, phenanthroline solution and water, the potassium dichromate-sulfuric acid solution is placed in a water bath kettle (8), the ferrous sulfate solution, the phenanthroline solution and the water are placed on a reagent bottle rack (7), and soil samples about 0.3g are weighed and placed in a glass sample bottle (229) in a working area (4);

52 Start detection, start device:

521 The triaxial module (2) moves to the first glass sample bottle (229), the container (229) is clamped by the electric claw (224) and moves to the liquid adding position (36), and the steering engine (44) drives the liquid adding pipe (45) to swing to the position above the container (229) to add potassium dichromate-sulfuric acid solution;

522 The electric claw (224) clamps the second glass sample bottle (229) back to the original position, the liquid adding is started, the electric claw moves the first glass sample bottle (229) to the graphite digestion position (34) for digestion when the third container is added, during the period, the electric claw (224) continues to add liquid to other containers, and simultaneously moves the second glass sample bottle (229) and the third glass sample bottle (229) to the graphite digestion position (34);

523 After the first glass sample bottle (229) is digested, the electric claw (224) moves the first glass sample bottle (229) to the original position, and the first glass sample bottle (229) is washed and cooled by the washing head (228);

524 After the cooling time is up, the electric claw (224) moves to the titration position (37), the white area light source (41) and the camera (43) are started, the steering engine drives the burette to titrate, three drops of phenanthroline solution are added, ferrous sulfate solution is added, the camera (43) records and judges the color of the liquid in the container in real time,

when the liquid color is judged to be changed from blue-green to brown-red, the titration is finished, the number of drops is recorded, the result is calculated, the above work is sequentially repeated to finish the detection of the soil samples in all containers, and finally the organic matter content of the soil samples is presented in a form of a table.