CN111239330A - COD analytical equipment - Google Patents
COD analytical equipment Download PDFInfo
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- CN111239330A CN111239330A CN202010181373.9A CN202010181373A CN111239330A CN 111239330 A CN111239330 A CN 111239330A CN 202010181373 A CN202010181373 A CN 202010181373A CN 111239330 A CN111239330 A CN 111239330A
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- condensation
- sample
- digestion
- liquid feeding
- cup
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
Abstract
The invention discloses a COD (chemical oxygen demand) analysis device, and relates to the technical field of chemical experimental instruments. The COD analysis device comprises a box body, a condensation reflux mechanism arranged above the box body, a sample turntable arranged below the box body and corresponding to the condensation reflux mechanism, a driving mechanism arranged at the lower part of the sample turntable and used for driving the sample turntable to rotate, a heating module positioned below the sample turntable and used for heating a sample, a lifting mechanism used for lifting the heating module and a detection device used for detecting the sample; the condensation reflux mechanism comprises a condensation reflux bracket, a plurality of condensation bottle insertion holes arranged along the circumferential direction of the condensation reflux bracket and condensation bottles inserted in the condensation bottle insertion holes; and a plurality of digestion cup insertion holes for inserting digestion cups are formed in the sample turntable along the circumferential direction. The method can complete the determination of the chemical oxygen demand indexes of a plurality of samples in batches each time, thereby greatly improving the detection efficiency; in the process of detection and titration, manual guard is not needed in the whole process, and the automation degree is high.
Description
Technical Field
The invention relates to the technical field of chemical experimental instruments, in particular to a COD (chemical oxygen demand) analysis device.
Background
The Chemical Oxygen Demand (COD) is an important index in water quality determination and is used for reflecting and characterizing the degree of water body pollution. The dichromate method for determining the chemical oxygen demand of water (HJ 828 and 2017) is a main method for monitoring the chemical oxygen demand of water in China at present, and a large amount of monitoring data are generated every year in China. The method is widely applied to water quality determination as a recognized standard method.
At present, the domestic detection equipment for the chemical oxygen demand of the laboratory has the following technical problems: the automation degree of the detection equipment is low, and the whole test process still needs more manual intervention; meanwhile, samples cannot be detected in batches, and the detection efficiency is low. How to solve the technical problems is a technical problem to be solved in the technical field of chemical experimental instruments at present.
Disclosure of Invention
In view of the above technical problems, an embodiment of the present invention provides a COD analyzing apparatus to solve the problems mentioned in the background art.
The invention provides the following technical scheme: a COD analysis device comprises a box body, a condensation reflux mechanism arranged above the box body, a sample turntable arranged below the box body and corresponding to the condensation reflux mechanism, a driving mechanism arranged at the lower part of the sample turntable and used for driving the sample turntable to rotate, a heating module positioned below the sample turntable and used for heating a sample, a lifting mechanism used for lifting the heating module and a detection device used for detecting the sample; the condensation reflux mechanism comprises a condensation reflux bracket, a plurality of condensation bottle insertion holes arranged along the circumferential direction of the condensation reflux bracket and condensation bottles inserted in the condensation bottle insertion holes; and a plurality of digestion cup insertion holes for inserting digestion cups are formed in the sample turntable along the circumferential direction.
Preferably, the device also comprises a liquid adding mechanism arranged on the condensation reflux mechanism; the liquid feeding mechanism comprises a first rotary liquid feeding arm, a first motor for driving the first rotary liquid feeding arm to rotate, and a liquid feeding pipe which is arranged in the first rotary liquid feeding arm and extends out of the free end part of the first rotary liquid feeding arm; the liquid feeding pipe is connected in series with a liquid feeding pump and a liquid feeding valve.
Preferably, a titration mechanism for sample titration is arranged in the box body, and the titration mechanism comprises a second rotary liquid inlet arm, a second motor for driving the second rotary liquid inlet arm to rotate, and a liquid dropping pipe which is arranged in the second rotary liquid inlet arm and extends out of the free end part of the second rotary liquid inlet arm; the dropping liquid pipe is connected with the titration pump and the titration valve in series.
Preferably, a stirring mechanism for stirring the sample is arranged below the heating module.
Preferably, the digestion cup is provided with a first limiting structure for limiting the digestion cup on the sample turntable.
Preferably, the condensation bottle is provided with a second limiting structure for limiting the condensation bottle on the condensation backflow bracket.
Preferably, the bottom of the condensation bottle is spherical, and the top of the condensation bottle is trumpet-shaped; and the cup mouth of the digestion cup for loading the sample is in a horn shape which is matched with the spherical shape at the bottom of the condensation bottle.
Preferably, the bottom of the condensation bottle is in a frosted spherical shape, and the cup mouth of the digestion cup is in a frosted horn shape.
Preferably, the detection device is a color sensor.
The COD analysis device provided by the embodiment of the invention has the following beneficial effects: the method can complete the determination of the chemical oxygen demand indexes of a plurality of samples in batches each time, thereby greatly improving the detection efficiency; in the process of detecting and titrating, the whole process does not need to be watched manually, and the automation degree is high; the measuring process of each sample has consistency, the human interference factor is avoided, the measuring result has better reproducibility, and the precision and the accuracy are higher.
Drawings
FIG. 1 is a schematic perspective view of a COD analyzer according to the present invention;
FIG. 2 is a schematic diagram showing the principle and effect of the COD analyzer of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, fig. 1 is a schematic view of the COD analysis device according to the present invention; FIG. 2 is a schematic diagram showing the principle and effect of the COD analyzer of the present invention;
a COD analysis device comprises a box body 100, a condensation reflux mechanism 110 arranged at the upper part in the box body 100, a sample turntable 130 arranged at the lower part in the box body 100 and corresponding to the condensation reflux mechanism 110, a driving mechanism arranged at the lower part of the sample turntable 130 and used for driving the sample turntable 130 to rotate, a heating module 150 positioned below the sample turntable 130 and used for heating a sample, a lifting mechanism 160 used for lifting the heating module 150 and a detection device used for detecting the sample; the condensation reflux mechanism 110 comprises a condensation reflux bracket 112, a plurality of condensation bottle insertion holes arranged along the circumferential direction of the condensation reflux bracket 112 and condensation bottles 111 inserted in the condensation bottle insertion holes; a plurality of digestion cup insertion holes 132 for inserting the digestion cups 133 are circumferentially arranged on the sample turntable 130.
The invention also comprises a liquid adding mechanism 120 arranged on the condensation reflux mechanism 110; the liquid feeding mechanism 120 comprises a first rotary liquid feeding arm, a first motor for driving the first rotary liquid feeding arm to rotate, and a liquid feeding pipe which is arranged in the first rotary liquid feeding arm and extends out of the free end part of the first rotary liquid feeding arm; the liquid feeding pipe is connected in series with a liquid feeding pump and a liquid feeding valve.
The first motor is preferably a stepping motor, and an output shaft of the stepping motor is connected with a first rotary liquid inlet arm and can drive the first rotary liquid inlet arm to rotate.
During the experiment, the lifting mechanism 160 drives the heating module 150 to move upwards, the heating module 150 moves upwards to jack up the sample digestion cup on the sample turntable 130, so that the cup mouth of the sample digestion cup on the sample turntable 130 is in contact sealing with the lower end port of the condensation bottle on the condensation reflux mechanism 110; the first rotary liquid inlet arm starts to rotate to add liquid, and experimental reagents (such as potassium dichromate and catalyst silver sulfate) flow out of a liquid adding pipe extending out of the free end part of the first rotary liquid inlet arm, pass through a condensation bottle 111 and flow into a digestion cup 133 filled with a sample to be detected; the heating module 150 automatically starts heating, and the heating digestion reflux starts.
The liquid adding pump is preferably a plunger pump, the plunger pump can be simultaneously connected with a plurality of titration solution bottles, and for example, 2, 3 or more titration solution bottles can be arranged for containing different solutions; in order to realize the control of titrating different solutions, a liquid adding valve can be arranged between a liquid adding pump and a titrating solution bottle, and the liquid adding valve can be a two-way valve, a three-way valve or the like.
A titration mechanism for sample titration is arranged in the box body 100, and comprises a second rotary liquid inlet arm, a second motor for driving the second rotary liquid inlet arm to rotate, and a liquid dropping pipe which is arranged in the second rotary liquid inlet arm and extends out of the free end part of the second rotary liquid inlet arm; the dropping liquid pipe is connected with the titration pump and the titration valve in series.
The second motor is preferably a stepping motor, and the rotation of the stepping motor can drive the second rotary liquid inlet arm to rotate, so that the sample titration is realized.
When titration is needed, the second rotary liquid inlet arm rotates to the upper end of a sample to be titrated at a titration position to perform titration; when titration is not needed, the second rotary liquid inlet arm rotates to a non-titration position, and if the second rotary liquid inlet arm is close to the inner wall of the box body.
The second rotary liquid inlet arm can be set with different rotation angles according to requirements, and the angle rotation control is controlled by an encoder or a mechanical limiting assembly; if set up photoelectric sensor photoelectric sensing post at the rotatory feed liquor arm of second, set up photoelectric sensing post photoelectric sensor on step motor base, through the cooperation of photoelectric sensor and photoelectric sensing post, it is spacing to the response of the rotatory feed liquor arm of second realization.
A stirring mechanism for stirring the sample is arranged below the heating module 150; preferably, the stirring mechanism is disposed below the heating module 150 and below the digestion cup receptacle 132 corresponding to the position of the titration port of the titration mechanism.
The stirring mechanism is a magnetic stirrer and is arranged below a digestion cup jack 132 of a sample to be measured corresponding to the position of a titration port of a second rotary liquid inlet arm of the titration mechanism; the digestion cup is provided with a magnetic stirrer in advance.
When dropping, the rotatory feed liquor arm of second is rotatory to waiting to titrate the sample upper end of titrating the position, installs the buret way extraction on the rotatory feed liquor arm of second and corresponds to titrate reagent and begin to titrate, and the magnetic stirrers work of bottom drives the rotation of magnetic stirrers, stirs the sample, and the colour value of colour sensor real-time supervision sample is up to reaching and titrating the terminal point.
A digestion cup placing window 114 is formed on the position, close to the user, of the condensation reflux bracket 112 of the condensation reflux mechanism 110, so that a worker can conveniently insert the digestion cups on the sample turntable 130 from the placing window 114.
The sample turntable 130 is a digestion cup limiting plate 131 with an upper layer and a lower layer, a plurality of coaxial digestion cup insertion holes 132 are formed in the upper edge of the digestion cup limiting plate 131 with the upper layer and the lower layer along the circumferential direction, digestion cups 133 are inserted into the digestion cup insertion holes 132, and a first limiting structure 134 used for limiting the digestion cups 133 on the sample turntable 130 is arranged at the upper ends of the digestion cups 133.
The two layers of digestion cup limiting plates 131 are respectively an upper layer of digestion cup limiting plate and a lower layer of digestion cup limiting plate, the two layers of digestion cup limiting plates 131 can limit digestion of the vertical position of the cup 133, and a good sealing effect is achieved when the condensation bottle is in butt joint with the digestion cup 133.
The digestion cup 133 is inserted into the digestion cup insertion hole 132, the bottom of the digestion cup 133 is placed on the heating module 150, the lifting mechanism 160 drives the heating module 150 to move upwards, the heating module 150 moves upwards to jack up the sample digestion cup on the sample turntable 130, the first limiting structure 134 can limit the digestion cup 133 on the sample turntable 130, and the digestion cup 133 is prevented from sliding out of the digestion cup limiting plate 131.
The first limiting structure 134 may be a limiting clamping groove or an annular limiting plate arranged on the digestion cup 133. The digestion cup is used for loading a water sample to be detected.
Condensation backward flow bracket 112 is upper and lower two-layer condensation bottle limiting plate, the coaxial condensation bottle jack that sets up on the two-layer condensation bottle limiting plate, the interpolation of condensation bottle jack has condensation bottle 111, just condensation bottle 111 lower extreme is equipped with and is used for spacing the second limit structure 113 at condensation backward flow bracket 112 with condensation bottle 111.
The two-layer condensation bottle limiting plate is the condensation bottle limiting plate on upper strata and the condensation bottle limiting plate of lower floor respectively, and condensation bottle 111 installs on two-layer condensation bottle limiting plate from top to bottom, and the limiting plate can restrict condensation bottle 111 position, guarantees that condensation bottle 111 does not take place crooked at vertical direction vertical motion, prevents condensation bottle 111 roll-off from the condensation bottle limiting plate simultaneously.
The bottom 111b of the condensation bottle 111 is spherical, and the top 111a is trumpet-shaped; and the mouth of the digestion cup 133 loaded with the sample is in a horn shape which is matched with the spherical shape of the bottom 111b of the condensation bottle 111.
The bottom 111b of condensation bottle 111 is dull polish ball form, it is dull polish loudspeaker form to clear up cup 133 rim of a cup.
The frosted spherical bottom 111b and the frosted horn-shaped cup opening 133 can ensure that the digestion cup opening is exactly matched and completely sealed when being butted with the bottom of the condensation bottle.
The top opening of the condensing bottle 111 is designed to be horn-shaped, the area of the horn-shaped opening is large, and liquid adding operation is convenient for experiments.
The lifting mechanism 160 is a ball screw mechanism for driving the condensing reflux mechanism 110 to move up and down.
The lower part of the sample turntable 130 is provided with a third motor for driving the sample turntable to rotate, the third motor penetrates through the heating module 150, the end part of the third motor is connected with a positioning rod, the positioning rod is provided with a limit switch, sample positioning on the sample turntable 130 is realized, and then liquid adding and titration operations of corresponding samples are completed.
It should be noted that a temperature sensor or a thermocouple is disposed on the heating module 150 to realize constant temperature heating of the heating module 150.
The heating module 150 is an electric heating element, such as an electric heating alloy, an electric heating material, a microwave heating device, an electromagnetic induction device, an electric heating wire, an electric heating plate, an electric heating belt, an electric heating cable, an electric heating disc, an electric thermocouple, an electric heating coil, an electric heating rod, an electric heating belt, and the like.
The detection device is a color sensor, and the color sensor is arranged in the box body and is arranged in the same level with the digestion cup jack 132 of the sample to be detected.
The use method of the full-automatic COD analyzer comprises the following steps:
1. preparation work: firstly, a worker prepares an experimental reagent for an experiment, edits corresponding experimental parameters and sample information through a controller, clicks to start the experiment, an instrument automatically extracts mercury sulfate and potassium dichromate solution, and performs the operation of adding the experimental reagent, so that the reagent adding is completed;
2. experiment detection operation: the lifting mechanism 160 drives the heating module 150 to move upwards, the heating module 150 moves upwards to jack up the sample digestion cup on the sample turntable 130, and thus the cup mouth of the sample digestion cup on the sample turntable 130 is in contact sealing with the lower end port of the condensation bottle on the condensation reflux mechanism 110; the liquid adding mechanism 120 starts to rotate and add acid, and the acid addition is finished; then the heating module 150 automatically starts heating and times, the countdown is finished, the heating is stopped, the instrument is cooled for a period of time, the liquid adding mechanism 120 starts to rotate and add water, the water adding is finished, the heating module 150 moves downwards to drive the digestion cup to be separated from the condensation bottle downwards until the heating module 150 returns to the original position; after the sample to be measured on the sample turntable 130 is continuously cooled for a period of time, the driving mechanism drives the sample to be measured on the sample turntable 130 to rotate to the titration position, the titration tube head of the titration mechanism rotates to the upper end of the sample to be measured at the titration position, the bottom stirring mechanism is automatically started to start titration, the titration is completed, and the turntable rotates to continuously perform titration on the next sample.
The COD analysis device provided by the embodiment of the invention has the following beneficial effects: the method can complete the determination of the chemical oxygen demand indexes of a plurality of samples in batches each time, thereby greatly improving the detection efficiency; in the process of detecting and titrating, the whole process does not need to be watched manually, and the automation degree is high; the measuring process of each sample has consistency, the human interference factor is avoided, the measuring result has better reproducibility, and the precision and the accuracy are higher.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (9)
1. A COD analytical equipment, characterized by: the device comprises a box body (100), a condensation reflux mechanism (110) arranged above the box body (100), a sample turntable (130) arranged below the box body (100) and corresponding to the condensation reflux mechanism (110), a driving mechanism arranged at the lower part of the sample turntable (130) and used for driving the sample turntable (130) to rotate, a heating module (150) positioned below the sample turntable (130) and used for heating a sample, a lifting mechanism (160) used for lifting the heating module (150) and a detection device used for detecting the sample; the condensation reflux mechanism (110) comprises a condensation reflux bracket (112), a plurality of condensation bottle insertion holes arranged along the circumferential direction of the condensation reflux bracket (112) and condensation bottles (111) inserted in the condensation bottle insertion holes; a plurality of digestion cup insertion holes (132) for inserting the digestion cups (133) are formed in the sample turntable (130) along the circumferential direction.
2. The COD analyzer according to claim 1, wherein: the liquid adding mechanism (120) is arranged on the condensation reflux mechanism (110); the liquid feeding mechanism comprises a first rotary liquid feeding arm, a first motor for driving the first rotary liquid feeding arm to rotate, and a liquid feeding pipe which is arranged in the first rotary liquid feeding arm and extends out of the free end part of the first rotary liquid feeding arm; the liquid feeding pipe is connected in series with a liquid feeding pump and a liquid feeding valve.
3. The COD analyzer according to claim 1, wherein: a titration mechanism for sample titration is arranged in the box body (100), and comprises a second rotary liquid inlet arm, a second motor for driving the second rotary liquid inlet arm to rotate, and a liquid dropping pipe which is arranged in the second rotary liquid inlet arm and extends out of the free end part of the second rotary liquid inlet arm; the dropping liquid pipe is connected with the titration pump and the titration valve in series.
4. The COD analyzer according to claim 1, wherein: and a stirring mechanism for stirring the sample is arranged below the heating module (150).
5. The COD analyzer according to claim 1, wherein: the digestion cup (133) is provided with a first limiting structure (134) for limiting the digestion cup (133) on the sample turntable (130).
6. The COD analyzer according to claim 1, wherein: and a second limiting structure (113) used for limiting the condensation bottle (111) on the condensation reflux bracket (112) is arranged on the condensation bottle (111).
7. The COD analyzer according to claim 1, wherein: the bottom (111b) of the condensation bottle (111) is spherical, and the top (111a) of the condensation bottle is trumpet-shaped; the mouth of the digestion cup (133) loaded with the sample is in a horn shape which is matched with the spherical shape of the bottom (111b) of the condensation bottle (111).
8. The COD analyzer according to claim 1, wherein: the bottom (111b) of condensation bottle (111) is dull polish ball form, it is dull polish loudspeaker form to clear up cup (133) rim of a cup.
9. The COD analyzer according to claim 1, wherein: the detection device is a color sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010181373.9A CN111239330A (en) | 2020-03-16 | 2020-03-16 | COD analytical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010181373.9A CN111239330A (en) | 2020-03-16 | 2020-03-16 | COD analytical equipment |
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| CN111239330A true CN111239330A (en) | 2020-06-05 |
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| CN202010181373.9A Pending CN111239330A (en) | 2020-03-16 | 2020-03-16 | COD analytical equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557143A (en) * | 2020-12-24 | 2021-03-26 | 生态环境部南京环境科学研究所 | A soil sample pretreatment device for lead-zinc slay heavy metal content detects |
| CN113777216A (en) * | 2021-08-09 | 2021-12-10 | 河北华清旭隆智能设备有限公司 | Sample liquid detection equipment |
| CN114019089A (en) * | 2021-11-01 | 2022-02-08 | 上海安杰环保科技股份有限公司 | Automatic titration device for supporting chemical oxygen demand in water |
| CN114199865A (en) * | 2021-12-13 | 2022-03-18 | 上海安杰环保科技股份有限公司 | Vacancy device capable of automatically lifting height of sample cup and digestion heating module thereof |
| CN114280224A (en) * | 2021-12-27 | 2022-04-05 | 上海安杰环保科技股份有限公司 | Device for sample tube digestion and titration |
-
2020
- 2020-03-16 CN CN202010181373.9A patent/CN111239330A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557143A (en) * | 2020-12-24 | 2021-03-26 | 生态环境部南京环境科学研究所 | A soil sample pretreatment device for lead-zinc slay heavy metal content detects |
| CN112557143B (en) * | 2020-12-24 | 2021-12-21 | 生态环境部南京环境科学研究所 | A soil sample pretreatment device for lead-zinc slay heavy metal content detects |
| CN113777216A (en) * | 2021-08-09 | 2021-12-10 | 河北华清旭隆智能设备有限公司 | Sample liquid detection equipment |
| CN114019089A (en) * | 2021-11-01 | 2022-02-08 | 上海安杰环保科技股份有限公司 | Automatic titration device for supporting chemical oxygen demand in water |
| CN114199865A (en) * | 2021-12-13 | 2022-03-18 | 上海安杰环保科技股份有限公司 | Vacancy device capable of automatically lifting height of sample cup and digestion heating module thereof |
| CN114280224A (en) * | 2021-12-27 | 2022-04-05 | 上海安杰环保科技股份有限公司 | Device for sample tube digestion and titration |
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