CN117451918A - Fully automatic and full-process Kjeldahl method measurement system and method - Google Patents

Abstract

The invention belongs to the technical field of Kjeldahl nitrogen determination instruments, and provides a full-automatic full-flow Kjeldahl method determination system and method, wherein a sample feeding machine is arranged between a digestion instrument and the nitrogen determination instrument, a transfer device is arranged between the digestion instrument and a sample feeding machine, and a sampling and placing mechanism is arranged in the sample feeding machine; when the test is carried out, firstly, the digestion tube placing platform in the digestion instrument is sent into the sample inlet machine through the transfer device, then the digestion tubes are sent to the nitrogen fixing instrument one by one through the taking and placing mechanism in the sample inlet machine for the test, the test mode of manually taking and placing the digestion tubes is replaced, the problem that one absorption tube is needed to be shared when the mechanical chuck is used for clamping the absorption tubes to absorb samples in a plurality of digestion tubes in the digestion instrument one by one on the basis of improving the test efficiency is solved, the problem that residual problems are caused in the absorption tubes when the samples are conveyed for many times is avoided, and the test precision is improved.

Description

Fully automatic and full-process Kjeldahl method measurement system and method

Technical field

The invention belongs to the technical field of Kjeldahl nitrogen analyzer, and in particular relates to a fully automatic and full-process Kjeldahl method determination system and method.

Background technique

The Kjeldahl nitrogen analyzer is an instrument that calculates the protein content by measuring the nitrogen content in the sample based on the principle that the nitrogen content in the protein is constant. Because the method of measuring and calculating the protein content is called the Kjeldahl method, it is called the Kjeldahl nitrogen analyzer. Nitrometer. There are four processes in the Kjeldahl nitrogen determination experiment, namely digestion, distillation, absorption and titration. The organic matter in the sample is digested and converted into inorganic ammonium salts, and then the ammonia gas is released through alkali distillation, and then absorbed by the boric acid solution. The boric acid absorption solution is then titrated with a standard hydrochloric acid or sulfuric acid titrant to restore the acidity, and the end point is determined by the color. . Finally, the nitrogen content is calculated by titrating the consumed volume and concentration of the acid.

The inventor found that when using the existing Kjeldahl nitrogen analyzer to perform a Kjeldahl nitrogen determination experiment, the process is to digest multiple digestive tubes with samples in the digestion instrument, and then digest all the digestive tubes one by one in a certain order. Put it on the nitrogen analyzer for distillation, absorption, titration and other processes. This method requires manual handling of the digestive tube. The entire experimental process is inefficient and is not suitable for batch experiments with multiple digestive tubes; and the digestive tubes are placed in During the nitrogen determination process, each time a new digestion tube is placed, the distillation tube needs to be manually tilted and then placed into the digestion tube. During this process, it is easy to cause the residual sample in the distillation tube to splash onto the experimenter or to determine the nitrogen. on the instrument, causing contamination problems; and in the process of intelligent development, in order to solve the problem of low efficiency of manually picking and placing the digestive tubes one by one for experiments, a mechanical chuck is used to clamp the absorption tubes, and multiple tubes in the digestion instrument are The samples in the digestive tube are absorbed one by one and then sent to the digestive tube in the nitrogen analyzer. However, although this method avoids manual picking and placing of the digestive tube, the multiple transportation of the sample requires the sharing of an absorption tube, and the sample must be transported multiple times. Residue will be produced in the absorption tube, and the residual sample will have an impact on subsequent experiments and reduce the accuracy of the experiment. Moreover, this method cannot replace the problem of picking and placing the digestive tube in the nitrogen analyzer.

Contents of the invention

In order to solve the above problems, the present invention proposes a fully automatic and full-process Kjeldahl method measurement system and method. A sample introduction machine is provided between the digestion instrument and the nitrogen determiner, and the digestive tube in the digestion instrument is placed on a platform through a transfer device. into the sample feeder, and then the digestive tubes are sent to the nitrogen analyzer one by one through the pick-and-place mechanism in the sample feeder for experiment. On the basis of ensuring the accuracy of the experiment, it replaces the test method of manually picking and placing the digestive tubes. Improved experimental efficiency.

In order to achieve the above objects, in the first aspect, the present invention provides a fully automatic and full-process Kjeldahl method measurement system, which adopts the following technical solutions:

A fully automatic and full-process Kjeldahl method determination system, including a pre-treatment mechanism for injecting samples into the digestive tube, a digestion instrument, a sample injector and a nitrogen determiner;

The digestion instrument is provided with a digestive tube placement platform, and the digestive tube placement platform is provided with a plurality of digestive tube placement positions; a transfer device is provided between the digestion instrument and the sample introduction machine, and the transfer device transfers the The digestive tube placement platform is transferred to the sample introduction machine;

The sample introduction machine is provided with a pick-and-place mechanism to transport the digestive tubes on the digestive tube placing platform one by one to the digestive tube installation position on the nitrogen determiner.

Further, the sample feeding machine is provided with an outer cover.

Further, the digester is provided with multiple digestive tube placing platforms; the sample introduction machine is provided with multiple digestive tube placing platform placement positions.

Further, the transfer device includes a first horizontal driving mechanism provided between the digester and the sample feeder, a vertical driving mechanism provided on the first water driving mechanism, and a first horizontal driving mechanism provided on the first water driving mechanism. A second horizontal driving mechanism on the vertical driving mechanism; the driving directions of the first horizontal shifting driving mechanism and the second horizontal driving mechanism are vertical.

Further, an end of the second horizontal driving mechanism away from the vertical driving mechanism is provided with a digestive tube placement platform fixing mechanism.

Further, a slide rail is provided on the internal bottom surface of the sample feeder, and a chute that can be connected to the slide rail is provided on the bottom of the digestive tube placement platform.

Further, the nitrogen determiner is fixed to the sample introduction machine; a digestive tube placement hole is provided on the outer cover, and the digestive tube placement hole is at the installation position of the digestive tube on the nitrogen determiner.

Further, a lifting device is provided at the installation position of the digestive tube.

Furthermore, the pick-and-place mechanism is a six-degree-of-freedom robotic arm.

In order to achieve the above object, in the second aspect, the present invention also provides a fully automatic full-process Kjeldahl method for determination, adopting the following technical solution:

A fully automatic full-process Kjeldahl method for determination, using a fully automatic full-process Kjeldahl assay system as described in the first aspect, including transferring a digestive tube placement platform with a digestive tube to a sample inlet through a transfer device In the machine, the digestive tubes on the digestive tube placement platform in the sample introduction machine are transported one by one to the installation position of the digestive tubes on the nitrogen determiner through a pick-and-place mechanism, and the experiment is performed through the nitrogen determiner.

Compared with the prior art, the beneficial effects of the present invention are:

1. In the present invention, a sample feeder is provided between the digester and the nitrogen analyzer, a transfer device is provided between the digester and the sample feeder, and a pick-and-place mechanism is provided in the sample feeder; when conducting the experiment, the digester is first transferred to the sample feeder through the transfer device. The digestive tube placement platform in the instrument is fed into the sample injector, and then the digestive tubes are sent to the nitrogen analyzer one by one through the pick-and-place mechanism in the sample injector for experiments, replacing the test method of manually picking and placing the digestive tubes. On the basis of improving the experimental efficiency, it solves the problem of using a mechanical chuck to clamp the absorption tube to absorb the samples in multiple digestion tubes in the digestion instrument one by one, and needs to share one absorption tube, avoiding the possibility that samples transported multiple times will be in the absorption tube. Eliminates residual problems and improves experimental accuracy;

2. The present invention provides an outer cover on the sample feeder, which reduces the pollution of the digestive tube from the external environment during the transfer process. On the basis of ensuring the accuracy of the experiment, it replaces the test method of manually picking and placing the digestive tube and improves the experimental efficiency;

3. Digestion in the digestion instrument and experiments in the nitrogen analyzer require a certain amount of time; and the addition of a pick-and-place mechanism in the sample introduction machine can improve the operational flexibility of the digestive tube. In order to improve the single To implement a larger number of digestive tubes during batch experiments, and to ensure that during batch experiments, subsequent experiments will stagnate due to digestion time and affect the batch experiments. In the present invention, multiple digestive tubes are provided in the digestion instrument. The platform increases the number of digestive tubes digested at one time and ensures the continuity of subsequent experiments; at the same time, in order to avoid that the test tubes after digestion are always in the digestion instrument and affect the use efficiency of the digestion instrument, in the present invention, a sample introduction machine is installed There are multiple digestive tube placement platforms, and the digestive tube placement platform in the digestion instrument can be taken out in time, ensuring the continuous use of the digestion instrument;

4. In the present invention, two horizontal driving mechanisms and one vertical driving mechanism are used to realize the purpose of transferring the digestive tube placement platform. The transfer device has good stability and avoids problems such as tilt and vibration during the transfer process of the digestive tube placement platform. It solves the problem of samples in the digestive tube shaking and sticking to the inner wall of the digestive tube and splashing out of the digestive tube during the transfer process of the digestive tube placement platform, ensuring experimental accuracy;

5. In the present invention, a slide rail is provided on the internal bottom surface of the sample feeder. Correspondingly, a slide rail that can be connected to the slide rail is provided on the bottom of the digestive tube placement platform. The digestive tube placement platform is moved in by the slide rail and slide groove. Movement within the sample machine improves the stability of the digestive tube placement platform when moving within the sample injector, further avoiding problems such as shaking the sample in the digestive tube and sticking to the inner wall of the digestive tube and splashing out of the digestive tube;

6. In the present invention, a lifting device is provided at the installation position of the digestive tube. During installation, the lifting device moves the installation position of the digestive tube downward. After the distillation tube is put into the digestive tube, the lifting device raises the installation position of the digestive tube to support the digestive tube. , avoids the problem of tilting the distillation tube every time the digestion tube is placed, and solves the problem of contamination caused by residual samples in the distillation tube splashing out when tilting the distillation tube;

7. In the present invention, the nitrogen determiner is fixed to the sample introduction machine, and the sample introduction machine and the digestion instrument are fixed, which improves the overall stability of the device. The outer cover of the sample introduction machine is provided with a hole for placing the digestive tube. Place the hole at the installation position of the digestive tube on the nitrogen analyzer to facilitate the transportation of the digestive tube.

Description of the drawings

The description drawings that form a part of this embodiment are used to provide further understanding of this embodiment. The schematic embodiments and their descriptions of this embodiment are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

Figure 2 is a schematic diagram of the pick-and-place mechanism in Embodiment 1 of the present invention;

Figure 3 is a schematic diagram of the placement position of the digestive tube placement platform in Embodiment 1 of the present invention;

Figure 4 is a schematic diagram of the transfer device according to Embodiment 1 of the present invention;

Among them, 1. Digestion instrument; 11. Digestive tube placement platform; 12. Digestive tube placement position; 13. Digestive tube; 2. Sample feeder; 21. Pick and place mechanism; 22. Outer cover; 23. Slide rail; 24. Digestion Tube placement platform placement position; 3. Nitrogen determiner; 31. Digestive tube installation position; 32. Transparent cover; 4. Transfer device; 41. First horizontal shift driving mechanism; 42. Vertical driving mechanism; 43. Second horizontal Driving mechanism; 44. Digestive tube placement platform fixing mechanism.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings commonly understood by one of ordinary skill in the art to which this application belongs.

Example 1:

When using the existing Kjeldahl nitrogen analyzer to perform a Kjeldahl nitrogen determination experiment, the process is to digest multiple digestion tubes with samples in the digestion instrument, and then place all the digestion tubes one by one in a certain order. Processes such as distillation, absorption, and titration are carried out on a nitrogen analyzer. This method requires manual handling of the digestive tubes, and the entire experimental process is inefficient. However, the mechanical chuck is used to clamp the absorption tubes, and the multiple digestion tubes in the digestion instrument are The samples are absorbed one by one and sent to the digestion tube in the nitrogen analyzer. Although manual picking and placing of the digestion tube is avoided, the same absorption tube needs to be shared for multiple transportation of the sample. Multiple transportation of the sample will produce residues in the absorption tube. The residual sample will have an impact on subsequent experiments and affect the experimental accuracy; in order to solve the above problems, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, this embodiment provides a fully automatic and full-process Kjeldahl method measurement system , including a pre-treatment mechanism for injecting samples into the digestive tube, digestion instrument 1, sample injector 2 and nitrogen determiner 3;

The digestion instrument 1 is provided with a digestive tube placement platform 11, and a plurality of digestive tube placement positions 12 are provided on the digestive tube placement platform 11; a transfer device 4 is provided between the digestion instrument 1 and the sample introduction machine 2 , the transfer device 4 can transfer the digestive tube placement platform 11 to the sample introduction machine 2;

The sample introduction machine 2 is provided with a pick-and-place mechanism 21, which can transport the digestive tubes 13 on the digestive tube placement platform 11 one by one to the digestive tube installation position 31 on the nitrogen determiner 3; The prototype 2 is provided with an outer cover 22 .

It can be understood that the digester 1 and the nitrogen determiner 3 in this embodiment can be implemented by existing equipment or improvements to existing equipment; the digestive tube placement platform 11 can be understood as being provided with multiple test tubes. Mechanisms such as test tube racks that place holes, the digestive tube placement position 12 can be understood as placement holes and other structures; optionally, in order to facilitate the transfer of the digestive tube placement platform 11 by the transfer device 4, the digestive tube placement position 12 can be placed in the digestion instrument An operating hole is provided on the side of 1 to facilitate the work of the transfer device 4; in order to ensure that the digestive tube can be smoothly placed in the digestive tube installation position 31 on the nitrogen determiner 3, in some embodiments, the nitrogen determiner can be The length of the distillation tube on the instrument is appropriately reduced, so that there is a certain distance between the lower end of the distillation tube and the installation position of the digestive tube, ensuring that the lower end of the distillation tube can be placed in the digestive tube; in other embodiments, the lower end of the distillation tube can also be installed in the digestive tube. Position 31 is provided with lifting devices such as a hydraulic lifting device, a pneumatic lifting device or an electric lifting device. During installation, the lifting device moves the installation position of the digestive tube downwards. After the distillation tube is placed in the digestive tube, the lifting device raises the installation position of the digestive tube. Hold the digestive tube; or in some other embodiments, a hydraulic lifting device or a pneumatic lifting device is provided on the distillation device. During installation, the lifting device lifts the distillation device, the distillation tube rises, and the pick-and-place mechanism 21 installs the digestive tube. After arriving at the installation position of the digestive tube, the lifting device moves the distillation device downward, and the distillation tube moves downward into the digestive tube to complete the transportation of the digestive tube; in order to facilitate the observation in the nitrogen determiner 3, in this embodiment, in the nitrogen determination A transparent cover 32 is provided on the instrument 3.

Optionally, the pretreatment mechanism can be implemented using equipment such as a robot or an automatic sample feeder. First, the sample is added to the digestive tube, then the catalyst and acid are added to the digestive tube, and finally the digestive tube is placed on the digestive tube placement platform 11; For example, using multiple robots with multi-degree-of-freedom manipulators, one or more manipulators can grab containers containing samples, catalysts, and acids to the mouth of the digestion tube, and pour the samples, catalysts, and acids into the digestion tube. The digestive tube can also be grabbed by a robot. After the sample, catalyst and acid are poured into the digestive tube, the robot then places the digestive tube into the corresponding position on the digestive tube placement platform 11. The entire process is an automated process.

Specifically, the sample feeder 2 is disposed between the digestion instrument 1 and the nitrogen determiner 3, and the transfer device 4 is disposed between the digestion instrument 1 and the sample feeder 2. The sample machine 2 is provided with the pick-and-place mechanism 21; when performing an experiment, the digestive tube placing platform 11 in the digestion apparatus 1 is first sent to the sample introduction machine 2 through the transfer device 4, and then through The pick-and-place mechanism 21 in the sample introduction machine 2 sends the digestive tubes 13 to the nitrogen determiner 3 one by one for experiments, replacing the test method of manually picking and placing the digestive tubes, and on the basis of improving the experimental efficiency. , which solves the problem of using a mechanical chuck to clamp the absorption tube to absorb the samples in multiple digestion tubes in the digestion instrument one by one and requiring a shared absorption tube. It avoids the problem of residuals in the absorption tube due to multiple transports of samples, and improves efficiency. Experimental accuracy; at the same time, the outer cover 22 is provided on the sample introduction machine 2, which reduces the contamination of the samples in the digestive tube 13 by the external environment during the transfer process. On the basis of ensuring the experimental accuracy, it replaces manual picking and placing of digestion. The tube test method improves the experimental efficiency.

Because digestion in the digestion instrument 1 and experiments in the nitrogen determiner 3 require a certain amount of time; and the addition of the pick-and-place mechanism 21 in the sample introduction machine 2 can improve the digestion efficiency. In order to improve the operational flexibility of the tube 13, more digestive tubes can be used in a single batch experiment, and to ensure that in batch experiments, subsequent experiments will be stagnated due to digestion time and affect the batch experiments. In this embodiment, Multiple digestive tube placement platforms 11 are provided in the digestion apparatus 1, which increases the number of digestive tubes digested at one time and ensures the continuity of subsequent experiments. Optionally, the digestion apparatus 1 is configured as a multi-layer structure, with different digestive tube placement platforms located on different layers. Of course, multiple digestive tube placement platforms can also be placed horizontally in a single-layer or multi-layer digestion apparatus 1. Realize the setting of multiple digestive tube placement platforms. At the same time, in order to avoid that the test tubes after digestion are always in the digestion apparatus 1 and affect the use efficiency of the digestion apparatus 1, in this embodiment, a plurality of digestive tube placement platforms 24 are provided in the sample introduction machine 2. The digestive tube placing platform 11 in the digestion apparatus 1 can be taken out in time, ensuring the continuous use of the digestion apparatus.

In this embodiment, the transfer device 4 may include a first horizontal shift drive mechanism 41 disposed between the digestion instrument 1 and the sample feeder 2 , and a vertical shift drive mechanism disposed on the first water drive mechanism 41 . The straight driving mechanism 42 and the second horizontal driving mechanism 43 provided on the vertical driving mechanism 42; the driving directions of the first horizontal driving mechanism 41 and the second horizontal driving mechanism 42 are vertical. An end of the second horizontal driving mechanism 43 away from the vertical driving mechanism 42 is provided with a digestive tube placement platform fixing mechanism 44 .

Optionally, the first horizontal driving mechanism 41 and the second horizontal driving mechanism 43 can be implemented by linear motors and other devices, and the first horizontal driving mechanism 41 can drive the vertical driving mechanism 42 and the vertical driving mechanism 42 . The second horizontal drive mechanism 43 moves horizontally between the digestion instrument 1 and the sample feeder 2; the vertical drive mechanism 42 is fixed to the moving part of the first horizontal shift drive mechanism 41, such as Fixed to the belt-driven slide block in the linear motor, the vertical driving mechanism 42 can adopt a hydraulic lifting device, a pneumatic lifting device or an electric lifting device, etc. The vertical driving mechanism 42 can drive the second horizontal driving mechanism 43 moves up and down; the second horizontal driving mechanism 43 is fixed to the moving part of the vertical driving mechanism 42, such as to the lifting rod of the lifting device; the digestive tube placement platform fixing mechanism 44 can be fixed to the On the moving part of the second horizontal driving mechanism 43, such as being fixed to the belt-driven slider in the linear motor, the second horizontal driving mechanism 43 can drive the digestive tube placement platform fixing mechanism 44 to pass through the digestion instrument 1 After opening the operating hole on the side, move the digester 1 back and forth. Through the arrangement of the first horizontal driving mechanism 41 , the vertical driving mechanism 42 and the second horizontal driving mechanism 43 , the position of the digestive tube placement platform fixing mechanism 44 in the horizontal position and the vertical position can be realized. Move arbitrarily to realize the transportation of the digestive tube placement platform 11; the fixed mechanism 44 of the digestive tube placement platform can be implemented by using structures such as clamping claws and inserting plates. For example, when using clamping claws, the digestive tube placing platform 11 can be directly transported For clamping, when an inserting plate is used, the bottom of the digestive tube placement platform 11 can be inserted and the digestive tube placement platform 11 can be lifted up.

It can be understood that the purpose of transferring the digestive tube placement platform 11 is achieved through two horizontal drive mechanisms and one vertical drive mechanism. The transfer device 4 has good working stability and avoids the digestive tube placement platform 11 from tilting during the transfer process. and vibration, which solves the problem of samples in the digestive tube shaking and then sticking to the inner wall of the digestive tube 13 and splashing out of the digestive tube 13 during the transfer process of the digestive tube placement platform 11, ensuring experimental accuracy.

In some other embodiments, the transfer device 4 can directly adopt a structure such as an AGV trolley, and the digestive tube placement platform 11 can be directly fixed on the AGV trolley through conventional connection methods such as bolts or welding. After digestion, the AGV trolley will The digestion tube placement platform 11 with the digestive tube 13 is transported to the sample introduction machine 2, and then the subsequent operations are performed through the pick-and-place mechanism 21; of course, in some embodiments, the sample introduction machine may not be provided, and after digestion, the digestion is carried out through the AGV The trolley transports the chemical tube placement platform 11 with the digestive tube 13 to the vicinity of the digestion instrument, and directly uses a mechanical arm or other structures to place the digestive tube 13 on the nitrogen analyzer.

After the digestive tube placement platform 11 is sent into the sample introduction machine 2, when the pick-and-place mechanism 21 clamps the digestive tube 13, the digestive tube placement platform 11 needs to be stable to ensure the clamping action of the digestive tube 13. Therefore, in this embodiment, a slide rail 23 is provided on the internal bottom surface of the sample feeder 2, and a chute capable of connecting with the slide rail 23 is provided on the bottom of the digestive tube placement platform 11. ; In the process of the transfer device 4 sending the digestive tube placement platform 11 to the sample feeder 2, the chute can be inserted into the slide rail 23, and the chute and the slide The cooperation of the rails 23 improves the stability of the digestive tube placement platform 11 at the bottom of the sample feeder 2 to a certain extent, and avoids excessive shaking or the occurrence of the digestive tube 13 when the pick-and-place mechanism 21 clamps the digestive tube 13. The problem of large deviation of the digestive tube placement platform 11 is improved, so that the pick-and-place mechanism 21 can smoothly clamp the digestive tube 13.

In order to improve the overall stability of the device, the nitrogen determiner 3 can be fixed to the sample feeder 2 by welding or bolting, and the sample feeder 2 can be connected to the sample feeder 2 by welding or bolting. The digestion instrument 1 is fixed; the outer cover 22 is provided with a hole for placing the digestive tube, and the hole for placing the digestive tube is at the installation position of the digestive tube on the nitrogen analyzer to facilitate the transportation of the digestive tube 13. In order to facilitate observation of the transportation of the digestive tube 13 and to view the overall situation of the digestive tube placement platform 11 and the digestive tube 13 in the sample delivery machine in real time, in this embodiment, the outer cover 22 is set as a transparent cover.

It can be understood that the installation position of the digestive tube of the nitrogen analyzer refers to the digestion position. When placing the digestive tube 3, there are requirements for the angle, height and other postures of the digestive tube 13. Therefore, in this embodiment, The pick-and-place mechanism 21 is configured as a six-degree-of-freedom mechanical arm, ensuring flexibility in transporting and installing the digestive tube 13; it can be understood that a clamping claw for holding the digestive tube is provided at the end of the pick-and-place mechanism 21. The settings of the clamping jaws are conventional settings and will not be described in detail here.

Example 2:

This embodiment provides a fully automatic and full-process Kjeldahl method, which adopts the fully automatic and full-flow Kjeldahl method as described in Example 1, including transferring the digestion tube with the digestive tube 13 through the transfer device 4. The tube placement platform 11 is transferred to the sample feeder 2, and then the digestive tubes 13 on the digester tube placement platform 11 in the sample feeder 2 are transported one by one to the digestive tube installation position on the nitrogen determiner 3 through the pick-and-place mechanism 21. , conduct experiments through nitrogen analyzer 3.

The above descriptions are only preferred embodiments of this embodiment and are not intended to limit this embodiment. For those skilled in the art, this embodiment may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this embodiment shall be included in the protection scope of this embodiment.

Claims (10)

1. The full-automatic full-flow Kjeldahl method measuring system is characterized by comprising a pretreatment mechanism for injecting sample into a digestive tube, a digestion instrument, a sample feeding machine and a nitrogen fixing instrument;

the digestion instrument is internally provided with a digestion tube placement platform, and a plurality of digestion tube placement positions are arranged on the digestion tube placement platform; a transfer device is arranged between the digestion instrument and the sample injector, and the transfer device transfers the digestion tube placing platform into the sample injector;

and a picking and placing mechanism is arranged in the sample feeding machine and is used for conveying the digestion tubes on the digestion tube placing platform to the digestion tube installation position on the azotometer one by one.

2. A full-automatic full-flow Kelvin method measuring system is characterized in that an outer cover is arranged on a sample feeding machine.

3. The full-automatic full-flow Kelvin method measurement system according to claim 1, wherein a plurality of digestion tube placement platforms are arranged in the digestion instrument; a plurality of digestion tube placement platform placement positions are arranged in the sample feeding machine.

4. The fully automated full-flow kjeldahl method measurement system of claim 1, wherein the transfer device comprises a first horizontal displacement drive mechanism disposed between the digestion instrument and the sample injector, a vertical drive mechanism disposed on the first water drive mechanism, and a second horizontal drive mechanism disposed on the vertical drive mechanism; the driving directions of the first horizontal movement driving mechanism and the second horizontal driving mechanism are vertical.

5. The fully automatic full-flow kjeldahl method measurement system according to claim 4, wherein the end of the second horizontal driving mechanism away from the vertical driving mechanism is provided with a digestive tract placement platform fixing mechanism.

6. The full-automatic full-flow Kelvin method measurement system according to claim 1, wherein a slide rail is arranged on the bottom surface of the interior of the sample injector, and a slide groove capable of being connected with the slide rail is arranged on the bottom of the digestion tube placement platform.

7. A fully automated full flow kjeldahl method measurement system according to claim 1, wherein the azotometer is fixed to the sample feeder; and a digestive tube placing hole is formed in the outer cover and is positioned at a digestive tube installation position on the azotometer.

8. The fully automatic full-flow kjeldahl method measurement system according to claim 1, wherein a lifting device is arranged at the installation position of the digestion tube.

9. The fully automated full-flow kjeldahl method measurement system according to claim 1, wherein the pick-and-place mechanism is a six-degree-of-freedom mechanical arm.

10. The full-automatic full-flow Kjeldahl method determination method is characterized in that the full-automatic full-flow Kjeldahl method determination system according to any one of claims 1 to 9 is adopted, the full-automatic full-flow Kjeldahl method determination system comprises the steps that a digestion tube placement platform with digestion tubes is transported into a sample feeding machine through a transporting device, then the digestion tubes on the digestion tube placement platform in the sample feeding machine are transported to a digestion tube installation position on a nitrogen fixing instrument one by one through a pick-and-place mechanism, and experiments are carried out through the nitrogen fixing instrument.