Full-automatic permanganate index analyzer

Abstract

The invention discloses a full-automatic permanganate index analyzer which comprises an instrument body, a sample position, a dropping position and a digestion position are arranged on a workbench of the instrument body, and a mechanical arm is arranged on the portion, above the workbench, of the instrument body. The mechanical arm is used for transferring a sample among the sample position, the dropping position and the digestion position in an assembly line working mode; the number of the dropping positions is three, a reagent dropping device is arranged above the dropping positions, and the reagent dropping device comprises a plurality of sets of pump valve systems; the digestion positions are arranged in the digestion device, and the number of the digestion positions is 12. The assembly line type titration experiment of a plurality of samples can be realized by adopting multi-drop positioning and multi-digestion positioning, all stages of the experiment do not interfere with each other, and the efficiency is greatly improved; different reagents correspond to different pump valve pipelines, so that the problem of poor precision caused by cross contamination is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of analyzers, and in particular relates to a fully automatic permanganate index analyzer. Background Art

[0002] Permanganate index, total hardness and chloride content are all important parameters that reflect water quality. The permanganate titration method (GB11892-89) stipulates: Add known amounts of potassium permanganate and sulfuric acid to the sample, mix well and digest in a boiling water bath. Potassium permanganate can fully oxidize and reduce substances, then add excess sodium oxalate to consume the remaining potassium permanganate, and finally add potassium permanganate drop by drop. The reaction end point is determined by the sudden change in the color of the reaction system, and the permanganate index in the water sample is calculated using the actual titration amount of potassium permanganate consumed.

[0003] Existing permanganate index analysis devices, such as a permanganate index analyzer with publication number CN112083119A, include a multi-way valve assembly, a peristaltic pump, a digestion assembly, and a drainage assembly. Among them, the multi-way valve assembly includes multiple channels, all of which are connected to the inlet of the peristaltic pump, and all channels are provided with switch valves. When extracting samples or reagents, open the corresponding switch valve so that the corresponding channel is connected to the inlet of the peristaltic pump. The peristaltic pump rotates to send the solution into the digestion cup of the digestion assembly, and the heating structure heats the solution in the digestion cup. The sample and the reagent react in the digestion cup to complete the permanganate index determination.

[0004] Similar to the above-mentioned index analysis device, the existing permanganate index analyzers on the market have many shortcomings. For example, multiple reagents share a set of pipelines in the instrument and are switched using switching valves, which causes cross contamination and leads to inaccurate results. Moreover, most instruments are single-parameter analyzers, and each device can only detect one parameter. Units that need to detect multiple parameters need to purchase multiple instruments, which greatly increases the cost of use.

[0005] Therefore, there is an urgent need for a fully automatic permanganate index analyzer that can solve the above problems. Summary of the invention

[0006] In order to solve the deficiencies of the prior art, the present application provides a fully automatic permanganate index analyzer, which can automatically complete the test of the permanganate index, etc., with higher accuracy, can test multiple parameters at one time, and has lower cost.

[0007] The technical effects to be achieved by this application are achieved through the following solutions:

[0008] According to the first aspect of the present application, there is provided a fully automatic permanganate index analyzer, comprising an instrument body, a sample position, a dropping position and a digestion position being arranged on a workbench of the instrument body, a mechanical arm being arranged on the instrument body above the workbench, and the mechanical arm being used to transfer the sample between the sample position, the dropping position and the digestion position in an assembly line working manner; there are three dropping positions, a reagent dropping device being arranged above the dropping position, and the reagent dropping device comprising several sets of pump valve systems; the digestion position is arranged in the digestion device, and there are 12 digestion positions.

[0009] Preferably, the reagent dropping device comprises two titration axes, and each of the titration axes drives a plurality of titration ports of the pump-valve systems to move on the titration position.

[0010] Preferably, the titration positions are arranged in a line close to the inner side of the workbench, and the titration axes are arranged in an up-and-down staggered manner.

[0011] Preferably, the pump-valve system comprises a storage tank, a liquid adding pump and a hose which are connected in sequence, and an outlet of the hose is connected to a titration port on the titration shaft.

[0012] Preferably, the digestion device is a water bath, and a communicating pre-water replenishment device is connected to the water bath, and the communicating pre-water replenishment device forms a communicating vessel with the water bath.

[0013] Preferably, the connected pre-water replenishment device includes a water replenishment pipe, the top of which is provided with a water inlet and an air vent, the bottom of which is connected to the water bath, and a non-contact liquid level sensor is installed on the water replenishment pipe.

[0014] Preferably, the diameter of the water replenishment pipe is 85 mm. When water replenishment is needed, liquid is added to the water replenishment pipe through the water inlet for multiple times until the water level in the water replenishment pipe reaches and stabilizes to the required height.

[0015] Preferably, the dropping positions include dropping position 1, dropping position 2 and dropping position 3, wherein dropping position 1 and dropping position 2 are used for cyclic titration, and dropping position 3 is used for sample addition.

[0016] Preferably, the time it takes for the robot arm to sequentially transfer the twelve samples from the sample position to the drop position and place them at the digestion position after the three liquid additions are completed is equal to the digestion time of a single sample.

[0017] Preferably, for the digestion-completed samples, the robot arm is alternately transferred to the first and second titration positions for titration, and the titration-completed samples are transferred to the sample position.

[0018] According to one embodiment of the present application, the beneficial effect of using the fully automatic permanganate index analyzer of the present application is that the use of multiple drop positioning and multiple digestion positions can realize a pipeline titration experiment of multiple samples, and each stage of the experiment does not interfere with each other, and the efficiency is greatly improved;

[0019] Different reagents correspond to different pumps, valves and pipelines to avoid the problem of poor accuracy caused by cross contamination;

[0020] Slowly adding water to the water bath will not cause large temperature fluctuations, thereby further improving the analysis accuracy;

[0021] Different titration algorithms can be set according to different analysis needs to achieve the detection of total hardness, chloride and salt iodine, etc. For units that need to detect multiple parameters, the usability of the instrument is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the existing technical solutions, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a structural schematic diagram of a fully automatic permanganate index analyzer in one embodiment of the present application;

[0024] Figure 2 for Figure 1 The structural diagram at A in the middle;

[0025] Figure 3 for Figure 1 Schematic diagram of the back structure of the fully automatic permanganate index analyzer;

[0026] Figure 4 for Figure 3 The structural diagram at B in the middle;

[0027] Figure 5 This is a schematic diagram of the location structure of the water supply pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] like Figures 1 to 5 As shown, the fully automatic permanganate index analyzer in one embodiment of the present application includes an instrument body 100, a sample position 110, a dropping position 120 and a digestion position 130 are arranged on the workbench of the instrument body 100, and a mechanical arm 200 is arranged on the instrument body 100 above the workbench, and the mechanical arm 200 is used to transfer the sample between the sample position 110, the dropping position 120 and the digestion position 130 in an assembly line working manner; there are three dropping positions 120, and a reagent dropping device is arranged above the dropping position 120, and the reagent dropping device includes several sets of pump valve systems; the digestion position 130 is arranged in the digestion device, and there are 12 digestion positions 130.

[0030] The robot arm 200 in this embodiment includes a transverse axis and a longitudinal axis. The transverse axis drives the longitudinal axis to move transversely. A clamping claw is provided at the bottom of the longitudinal axis, and the longitudinal axis can drive the clamping claw to move longitudinally, so that the robot arm 200 can clamp the sample and move it arbitrarily on the workbench, placing the sample at the sample position 110, the titration position 120 and the digestion position 130 to complete the titration experiment.

[0031] In one embodiment of the present application, the reagent dropping device includes two titration axes 310, each of which drives the titration ports of the pump valve system to move on the titration position 120. The titration position 120 is arranged in a line near the inner side of the workbench, and the titration axes 310 are arranged in an up-and-down staggered manner. Each titration axis 310 can move freely left and right, so as to perform titration operations on different samples, ensuring that there is no interference during the experiment.

[0032] In one embodiment of the present application, the pump-valve system includes a storage tank 322, a liquid adding pump 321, and a hose connected in sequence, and the outlet of the hose is connected to the titration port on the titration shaft 310. Different reagents are stored in different storage tanks 322, the liquid adding pump 321 is a peristaltic pump, and different reagents use completely different pipelines, which will not cause cross contamination problems.

[0033] In one embodiment of the present application, the digestion device is a water bath, and the sample is placed on the digestion position and directly immersed in the water bath. The water bath is connected with a connected pre-water replenishment device, and the connected pre-water replenishment device forms a communicating vessel with the water bath. The connected pre-water replenishment device includes a water replenishment pipe 400, the top of which is provided with a water inlet and a vent, the bottom of which is connected to the water bath, and a non-contact liquid level sensor is installed on the water replenishment pipe 400, and the diameter of the water replenishment pipe 400 is 85 mm. When water replenishment is required, liquid is added to the water replenishment pipe 400 multiple times through the water inlet until the water level of the water replenishment pipe 400 reaches and stabilizes to the required height.

[0034] During use, when the liquid level sensor detects that the liquid level is lower than the set value, the instrument replenishes water from the upper water inlet of the connected pre-water replenishment device through the water pump 410. Since the diameter of the device itself is small, the liquid level rises quickly and exceeds the set value, and the instrument stops replenishing water. At this time, due to the principle of the communicating vessel, the water in the pre-water replenishment device will slowly flow into the water bath through the lower water outlet until the liquid level is lower than the set value again. The instrument repeats the above steps, and can automatically and slowly replenish water to the water bath without causing large temperature fluctuations. This solves the problem of excessive temperature fluctuations caused by excessive one-time replenishment of water in the water bath when the water bath is automatically replenished.

[0035] In one embodiment of the present application, the drop position 120 includes a drop position 120 1 , a drop position 120 2 and a drop position 120 3 . The drop position 120 1 and the drop position 120 2 are used for cyclic titration, and the drop position 120 3 is used for sample addition.

[0036] In one embodiment of the present application, the time for the robot arm 200 to sequentially transfer the twelve samples from the sample position 110 to the dropping position 120 and place them in the digestion position 130 after the three liquid additions are completed is equal to the digestion time of a single sample.

[0037] When in use, after the sample is placed on the sample position 110 and starts running, the instrument grabs the first sample 1 and transfers it to the dropping position 120 three through the mechanical arm 200, and the automatic reagent dropping device automatically moves to the top of the dropping position 120 three and adds the reagent to the sample. After the reagent is added, the mechanical arm 200 automatically transfers the sample 1 from the dropping position 120 three to the digestion position 1301 of the digestion device, and starts timing, waiting for digestion for 30 minutes;

[0038] During the waiting process for digestion, the robot arm 200 transfers the remaining samples to the digestion position 130 in sequence according to the above steps after a fixed waiting time. When the digestion position 130 is filled, the digestion of sample 1 is completed, and the robot arm 200 transfers sample 1 to the dropping position 120 one, and the automatic reagent dropping device starts titration. After the sample 2 completes the digestion for 30 minutes, the robot arm 200 transfers sample 2 to the dropping position 120 two, and the titration of sample 1 is completed at the same time. The robot arm 200 transfers sample 1 back to the sample position 110, and the subsequent samples are transferred in the same way, with a circulating water bath and cyclic titration. The entire process can automatically complete the operation steps of adding liquid, heating, titration, etc. in different experimental stages in accordance with national standards. The various stages of the experiment do not interfere with each other, and there is no occupancy of the dropping position 120, which greatly improves the efficiency.

[0039] During the permanganate index analysis process: the calculation formula for the experimental cycle is 1760 / (digestion digits-1), and the interval time of 12 digestion digits is 160 seconds, which is the entire permanganate experiment operation cycle, and also represents that the titration time of each sample is 160 seconds. After the coordinates and other properties of the experimental sample are set on the host computer and the water bath is heated to a slight boil, the detailed operation process is as follows:

[0040] At 0 seconds in the nth cycle, the robot moves to the top of the nth sample position, grabs the sample and transfers it to the liquid adding position. After putting down the sample, the robot resets, which takes 15 seconds.

[0041] At the 15th second of the nth cycle, the titration axis ① moves above the liquid addition level, which takes 4 seconds;

[0042] At the 19th second of the nth cycle, the titration axis ① adds the corresponding reagent according to the sample properties, which takes 21 seconds;

[0043] At the 40th second of the nth cycle, the titration axis ① moves according to whether there is a sample at the titration position. If there is a sample, it moves to the top of the corresponding sample. If there is no sample, it resets. This takes 4 seconds.

[0044] At the 44th second of the nth cycle, the robot moves to the top of the liquid adding position, grabs the sample and transfers it to the digestion position n. If n is greater than 12, the remainder of n is used to place the sample. After placing the sample, the robot resets, which takes 15 seconds.

[0045] At the 55th second of the nth cycle, the timing starts when the sample is placed in the digestion position;

[0046] At the 95th second of the n+11th cycle, the sample digestion time is the number of cycles 11*cycle time 160+40=1800 seconds, i.e. 30 minutes. The sample digestion is completed, the robot moves to the top of the digestion position, grabs the nth sample and transfers it to the dropping position ① (odd number) or the dropping position ② (n is an even number), and the robot resets after putting down the sample, which takes 15 seconds;

[0047] At the 110th second of the n+11th cycle, the titration axis ① moves to the top of the sample, which takes 4 seconds;

[0048] At the 114th second of the n+11th cycle, the titration axis ① adds the corresponding reagent according to the sample properties, which takes 16 seconds;

[0049] At the 120th second of the n+11th cycle, the titration axis ② moves to the top of the sample, which takes 4 seconds;

[0050] At 125 seconds in the n+11th cycle, the titration axis ② starts to titrate the sample;

[0051] At 120 seconds in the n+12th cycle, the robot moves to the top of the sample, grabs the sample and transfers it to the sample position, and marks the sample as having completed the experiment, which takes 15 seconds;

[0052] By repeating the above steps in each cycle, the entire experimental pipeline can be run. The various steps are closely integrated, which maximizes the waiting time of the sample when it is digested at the digestion position, greatly improving the experimental efficiency.

[0053] The maximum number of digestion positions is 12. The specific number of positions used can be modified on the host computer, ranging from 6 to 12. According to the experimental cycle calculation formula, when the number of digestion positions decreases, the experimental cycle increases, and the sample titration time increases, which can meet the problem of long fading time after adding sodium oxalate in special water quality experiments.

[0054] According to one embodiment of the present application, the beneficial effect of using the fully automatic permanganate index analyzer of the present application is that the use of multiple drop positioning and multiple digestion positions can realize a pipeline titration experiment of multiple samples, and each stage of the experiment does not interfere with each other, and the efficiency is greatly improved;

[0055] Different reagents correspond to different pumps, valves and pipelines to avoid the problem of poor accuracy caused by cross contamination;

[0056] Slowly adding water to the water bath will not cause large temperature fluctuations, thereby further improving the analysis accuracy;

[0057] Different titration algorithms can be set according to different analysis needs to achieve the detection of total hardness, chloride and salt iodine, etc. For units that need to detect multiple parameters, the usability of the instrument is increased.

[0058] This device can automatically complete the operation steps of adding liquid, heating, titration, etc. in different experimental stages. It is more convenient and safer than manual titration operation steps. At the same time, there is no cross contamination and the results are accurate. It can measure the permanganate index, total hardness, iodine, and chloride content.

[0059] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0062] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0063] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0064] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully automatic permanganate index analyzer, comprising an instrument body, a sample position, a drop position and a digestion position are arranged on a workbench of the instrument body, characterized in that: A robotic arm is arranged on the instrument body above the workbench, and the robotic arm is used to transfer the sample between the sample position, the dropping position and the digestion position in an assembly line working manner; there are three dropping positions, and a reagent dropping device is arranged above the dropping position, and the reagent dropping device includes several sets of pump valve systems; the digestion position is arranged in the digestion device, and there are 12 digestion positions.

2. The fully automatic permanganate index analyzer according to claim 1, characterized in that: The reagent dropping device comprises two titration axes, and each of the titration axes drives a plurality of titration ports of the pump-valve systems to move on the titration position.

3. The fully automatic permanganate index analyzer according to claim 2, characterized in that: The titration positions are arranged in a line close to the inner side of the workbench, and the titration axes are arranged in an up-and-down staggered manner.

4. The fully automatic permanganate index analyzer according to claim 2, characterized in that: The pump-valve system comprises a storage tank, a liquid adding pump and a hose which are connected in sequence, and an outlet of the hose is connected to a titration port on the titration shaft.

5. The fully automatic permanganate index analyzer according to claim 1, characterized in that: The digestion device is a water bath pot, and a communicating pre-water replenishing device is connected to the water bath pot, and the communicating pre-water replenishing device forms a communicating vessel with the water bath pot.

6. The fully automatic permanganate index analyzer according to claim 5, characterized in that: The connected pre-water replenishment device comprises a water replenishment pipe, the top of which is provided with a water inlet and an air vent, the bottom of which is connected to the water bath, and a non-contact liquid level sensor is installed on the water replenishment pipe.

7. The fully automatic permanganate index analyzer according to claim 6, characterized in that: The diameter of the water supply pipe is 85 mm. When water supply is needed, liquid is added to the water supply pipe through the water inlet for multiple times until the water level in the water supply pipe reaches and stabilizes to the required height.

8. The fully automatic permanganate index analyzer according to claim 1, characterized in that: The dropping positions include dropping position 1, dropping position 2 and dropping position 3. The dropping position 1 and dropping position 2 are used for cyclic titration, and the dropping position 3 is used for sample addition.

9. The fully automatic permanganate index analyzer according to claim 8, characterized in that: The time it takes for the robot arm to transfer the twelve samples from the sample position to the dropping position in sequence and place them at the digestion position after the three additions are completed is equal to the digestion time of a single sample.

10. The fully automatic permanganate index analyzer according to claim 9, characterized in that: For the digested samples, the robot arm is transferred alternately to titration position 1 and titration position 2 for titration, and the titration-completed samples are transferred to the sample position.

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