Water quality detection device based on batch sequential stepping-in

Abstract

The utility model provides a water quality detection device based on batch sequential stepping, which comprises a conveyor belt, a sample disc, a processing unit and a detection unit, and sample cups are arranged on the sample disc; the number N of the sample cups meets the requirement; the processing unit comprises a first mechanical arm and a reagent applying module, the reagent applying module is arranged on the first mechanical arm, and the first mechanical arm is arranged at a processing position; the detection unit comprises a second mechanical arm, a sample injection needle and a detection module, and the sample injection needle is arranged on the second mechanical arm and communicated with the detection module. The utility model has the advantages of miniaturization, high sensitivity and the like.

Description

Technical Field

[0001] The utility model relates to water quality detection, in particular to a water quality detection device based on batch sequential stepping. Background Art

[0002] In the field of water environment monitoring, general laboratories adopt manual testing, but the manual operation process is cumbersome, labor-intensive, inefficient and requires personnel on duty. At the same time, some reagents can cause great harm to the staff.

[0003] There are now fully automated instruments on the market that simulate manual work to free up manpower, but most of these fully automated instruments are special instruments that can only test a certain indicator. One instrument cannot meet customers' multi-parameter testing needs. If the laboratory has many test indicators, it will cost a lot of money to buy multiple special instruments with different indicators. In addition, most manufacturers use a three-dimensional robotic arm sequential sampling test process, which leads to low test efficiency. Summary of the invention

[0004] In order to solve the deficiencies in the above-mentioned prior art solutions, the utility model provides a water quality detection device based on batch sequential stepping.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A water quality detection device based on batch sequential stepping, the water quality detection device comprises a conveyor belt, a sample tray, a processing unit and a detection unit, the sample tray is provided with a sample cup; the number N of the sample cups satisfies, (T 3 +T 4 -T 5 ) / (T 6 -T 1 -T 2 )≤N≤T / T 6 , T 1 is the dilution time of a single sample, T 2 is the time of adding the colorimetric reagent for a single sample, T 3 is the color development time, T 4 is the extraction time, T 5 is the standing time after extraction, T 6 is the detection time of a single sample, T is the longest stability time of the detected substance;

[0007] The processing unit comprises a first mechanical arm and a reagent applying module, wherein the reagent applying module is arranged on the first mechanical arm, and the first mechanical arm is arranged at a processing position;

[0008] The detection unit comprises a second mechanical arm, an injection needle and a detection module. The injection needle is arranged on the second mechanical arm and is connected to the detection module.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] 1. High detection efficiency;

[0011] By setting the optimal number of samples in the same batch, that is, the number of sample cups on the sample tray, and combining processing and testing in parallel, the test efficiency can be increased by more than 50%;

[0012] Multiple sample cups are arranged on the sample tray, so that batch samples can be sequentially moved to the processing position and the testing position along the conveyor belt, and the sample processing and testing are carried out simultaneously, which improves the testing efficiency;

[0013] 2. Good compatibility;

[0014] One set of detection devices can meet the indicators of ammonia nitrogen, phosphate, nitrate, hexavalent chromium, nitrite, volatile phenol, constant silicon and other indicators based on the principle of photometric detection, truly realizing multi-parameter detection in one machine, reducing the cost and complexity of the device;

[0015] 3. Long service life;

[0016] The self-cleaning flow path design completely removes the hydrophilic phase intercepted at the front end of the hydrophobic filter, significantly extending the life of the hydrophobic membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of the structure of the sample tray in different positions according to an embodiment of the utility model;

[0019] Figure 2 A schematic structural diagram of a detection module according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] Figure 1-Figure 2 The following description describes optional specific embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. In order to teach the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these specific embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following optional specific embodiments, but is only limited by the claims and their equivalents.

[0021] Example 1.

[0022] The utility model embodiment is a water quality detection device based on batch sequential stepping, the water quality detection device comprising:

[0023] A plurality of sample trays 11 are arranged on a conveyor belt, so that each sample tray 11 passes through a processing position and a detection position in sequence; N sample cups 21 are arranged on each sample tray 11, and N satisfies:

[0024] (T3+T4-T5) / (T6-T1-T2)≤N≤T / T6, T1 is the dilution time of a single sample, T2 is the addition time of the colorimetric reagent of a single sample, T3 is the color development time, T4 is the extraction time, T5 is the standing time after extraction, T6 is the detection time of a single sample, and T is the maximum stability time of the detected substance;

[0025] The processing unit comprises a first mechanical arm and a reagent applying module, wherein the reagent applying module is arranged on the first mechanical arm, and the first mechanical arm is arranged at a processing position;

[0026] The detection unit comprises a second mechanical arm, an injection needle and a detection module. The injection needle is arranged on the second mechanical arm and is connected to the detection module.

[0027] In order to make the detection channel have a self-cleaning function, further, as Figure 2 As shown, the detection module includes:

[0028] A multi-channel selector valve 31, the ports of which are respectively connected to the injection needle 22, the waste liquid barrel 51, the detection channel and the chloroform container 91, and the common end is connected to the quantitative pump 41. A heater 61, a filter 71 and a circulation pool 81 are sequentially arranged on the detection channel.

[0029] The working mode of the water quality detection device based on batch sequential stepping in the embodiment of the utility model is:

[0030] Place multiple sample trays 11 on a conveyor belt in sequence, each sample tray has N sample cups 21, the number N satisfies, (T3+T4-T5) / (T6-T1-T2)≤N≤T / T6, T1 is the dilution time of a single sample, T2 is the addition time of the color developing reagent of a single sample, T3 is the color development time, T4 is the extraction time, T5 is the standing time after extraction, T6 is the detection time of a single sample, and T is the longest stability time of the detection substance;

[0031] The sample tray 11 moves forward with the conveyor belt, and the sample tray 11 is in the processing position and the detection position in sequence. In the processing position, dilution, reagent addition and color development are performed. When the sample tray is in the detection position, the adjacent sample tray is in the processing position.

[0032] In order to improve the detection accuracy, further, in the detection position, by switching the multi-channel selector valve 31, the injection needle 22 extends into the sample cup 21, and the quantitative pump 41 extracts the sample;

[0033] The multi-channel selector valve 31 is switched, and the quantitative pump 41 pushes the sample, and the sample passes through the heater 61 and the filter 71 in the forward direction and enters the circulation pool 81; the ports of the multi-channel selector valve 31 are respectively connected to the waste liquid bucket 51, the injection needle 22 and the chloroform container 91, and the common end is connected to the quantitative pump 41;

[0034] The multi-channel selector valve 31 is switched, and the waste liquid in the circulation pool 81 passes through the filter 71 and the heater 61 in the reverse direction;

[0035] The multi-channel directional valve 31 is switched, and the metering pump 41 pushes the extracted waste liquid, and the waste liquid enters the waste liquid barrel 51 .

[0036] In order to clean the detection channel, further,

[0037] The multi-channel selector valve 31 is switched, and the metering pump 41 draws chloroform from the container 91;

[0038] The multi-channel selector valve 31 is switched, and the metering pump 41 pushes the chloroform forward through the heater 61 and the filter 71 and into the circulation pool 81;

[0039] The multi-channel selector valve 31 is switched, and the waste liquid in the circulation pool 81 passes through the filter 71 and the heater 61 in the reverse direction;

[0040] The multi-channel directional valve 31 is switched, and the metering pump 41 pushes the extracted waste liquid, and the waste liquid enters the waste liquid barrel 51 .

[0041] In order to extract more samples, the sample cup 21 in the detection position is further tilted, and the injection needle 22 extends into the tilted bottom of the sample cup 21 .

[0042] In order to shorten the detection cycle, further, at the processing position, the first robot arm drives various reagent pipelines to sequentially add reagents to each sample cup 21 in the sample tray 11, and then sequentially adds other reagents to each sample cup 21 in the sample tray 11;

[0043] At the detection position, the second mechanical arm drives the injection needle 22 to extract samples from each sample cup 21 in the sample tray 11 in sequence.

[0044] Example 2.

[0045] According to the application example of the water quality detection device based on batch sequential stepping in volatile phenol detection in Example 1 of the utility model, an extraction method is adopted.

[0046] In this application example, the color development time of the volatile phenol extraction method is T 3 =10min, extraction time T 4 =2min, standing time T 5 =1min, single sample dilution time T 1 =0min, sample color development reagent addition time T 2 = 0.2min, the detection time of a single sample is T 6 =5min; the detection should be completed within 30min after 10min of color extraction of volatile phenol, T=30min.

[0047] Using (T3+T4-T5) / (T6-T1-T2)≤N≤T / T6, we can get: 3≤N≤6. According to the size of the 250mL sample cup (cup diameter 60mm), the instrument sample position is within the appropriate instrument size (instrument width is 400mm). The more sample positions the better, and the best number for the N extraction method is 5.

[0048] like Figure 1 As shown, a plurality of linear sample trays 11 are arranged on a conveyor belt, and five sample cups with equal spacing are arranged on each sample tray.

[0049] The processing unit is arranged at the processing position, and the first robot arm drives the reagent applying module to move in two dimensions, that is, to move forward and backward without moving up and down, so as to apply different reagents to the five sample cups 21 at the processing position.

[0050] The detection unit is arranged at the detection position, and the second mechanical arm drives the injection needle 22 to move in two dimensions, namely, forward and backward and up and down, so as to extend into the sample cup 21 to extract the extraction liquid.

[0051] A magnetic stirring module is also provided at the lower side of the sample tray 11 at the processing position. Correspondingly, a glass mesh 23 is provided on the bottom wall of the sample cup 21 , and a magnet 24 is provided in the glass mesh 23 .

[0052] A push rod motor is also provided at the lower side of the detection position for pushing the sample cup 21 to tilt.

[0053] like Figure 2 As shown, the ports of the multi-channel selector valve 31 are respectively connected to the sampling needle 22, the chloroform container 91, the waste liquid bucket 51 and the detection channel, and the detection channel is sequentially provided with a heater 61, a filter 71 and a circulation pool 81. A switching module is provided on the pipelines of the filter 71 and the circulation pool 81, and the switching module adopts a three-way valve 32, so that the outlet of the filter 71 is selectively connected to the chloroform container 91 or the circulation pool 81.

[0054] The working mode of the water quality detection device based on batch sequential stepping in the embodiment of the utility model is:

[0055] Placing a plurality of sample trays 11 on a conveyor belt in sequence, each sample tray having five sample cups 21;

[0056] The sample tray 11 is in a processing position and a detection position in sequence. At the processing position, dilution, reagent addition and color development are performed. When the sample tray is in the detection position, the adjacent sample tray is in the processing position.

[0057] The sample tray 11 moves forward with the conveyor belt. When the sample tray 11 is in the processing position, the magnetic stirring module is turned on, and the first robotic arm drives the reagent application module to move to the upper side of the sample cup 21 in turn, and 2.0 mL of buffer solution is added to each sample cup 21. In this way, 1.5 mL of 4-aminoantipyrine solution and 1.5 mL of potassium ferrocyanide solution are added to each sample cup respectively. After the reagent addition is completed, the magnetic stirring device is turned off. After color development for 10 minutes, 10 mL of chloroform is added to each sample cup 21 in turn, and the magnetic stirring device is started for stirring and extraction for 2 minutes.

[0058] After the processing is completed, the sample tray 11 moves to the detection position, and correspondingly, the other sample trays 11 move to the processing position, and the processing method is the same as above. The push rod motor at the bottom of the detection position is immediately started, and the five sample cups 21 on the same sample tray 11 are tilted 5 degrees and left to stand for ≥1min. After the organic phase and the inorganic aqueous phase are separated, the injection needle is driven by the second mechanical arm to extend into the bottom of the sample cup.

[0059] The multi-channel directional valve 31 is switched, and the quantitative pump 41 extracts a determined volume of the extract;

[0060] The multi-channel selector valve 31 and the three-way valve 32 are switched, and the quantitative pump 41 pushes the extracted extract, which enters the detection channel, passes through the heater 61 and the filter 71 in a forward direction, and enters the channel pool 81. The heater 61 heats the extracted extract to 40 degrees, and the filter 71 is provided with a 0.45 μm hydrophobic filter membrane.

[0061] After the detection is completed, the multi-channel selector valve 31 is switched, the quantitative pump 41 extracts, and the waste liquid in the circulation pool 81 passes through the filter 71 and the heater 61 in the reverse direction;

[0062] The multi-channel directional valve 31 is switched, and the metering pump 41 pushes the extracted waste liquid, and the waste liquid enters the waste liquid barrel 51 .

[0063] The multi-channel selector valve 31 and the three-way valve 32 are switched, and the dosing pump 41 extracts chloroform from the chloroform container 91. The chloroform passes through the three-way valve 32, and then passes through the filter 71 and the heater 61 in reverse, bringing all the water attached to the membrane at the front end of the filter into the dosing pump 41;

[0064] The multi-channel directional valve 31 is switched, and the quantitative pump 41 pushes the extracted chloroform into the waste liquid barrel 51 .

[0065] The multi-channel selector valve 31 is switched, the dosing pump 41 extracts, and the chloroform in the chloroform container 91 directly (without passing through the filter 71) enters the multi-channel selector valve 31.

[0066] The multi-channel selector valve 31 is switched, and the quantitative pump 41 pushes the extracted chloroform forward through the heater 61 and the filter 71 and enters the circulation pool 81;

[0067] The multi-channel selector valve 31 is switched, and the chloroform in the circulation pool 81 passes through the filter 71 and the heater 61 in the reverse direction;

[0068] The multi-channel directional valve 31 is switched, and the metering pump 41 pushes the extracted waste liquid, and the waste liquid enters the waste liquid barrel 51 .

[0069] Example 3.

[0070] According to the application example of the water quality detection device based on batch sequential stepping in embodiment 1 of the utility model, the difference from embodiment 2 is that:

[0071] Using direct detection, T 4 = T 5 =0, add 0.5 mL of buffer solution, 1.0 mL of 4-aminoantipyrine solution, and 1.0 mL of potassium ferrocyanide solution into each sample cup 21 in sequence. After the reagents are added, turn off the magnetic stirring module and color development for 10 minutes.

[0072] Example: Volatile phenol direct method (no extraction operation), color development time T 3 =10min, extraction time T 4 =0min, standing time T 5 =0min, single sample dilution time T 1 =0.5min, sample color development reagent addition time T 2 = 0.2min, the detection time of a single sample is T 6 =3min; the volatile phenol should be detected within 30min after 10min of color development, T=30min. (T3+T4-T5) / (T6-T1-T2)≤N≤T / T6, 10 / (3-0.5-0.2)≤N≤30 / 3 5≤N≤10, the size of the 50mL sample cup of the direct method (cup diameter 30mm), the instrument sample position is within the appropriate instrument size (instrument width is 400mm), the more sample positions the better, and the best number for N extraction method is 10.

Claims

1. A water quality detection device based on batch sequential stepping, the water quality detection device comprises a conveyor belt, a sample tray, a processing unit and a detection unit, and a sample cup is arranged on the sample tray; characterized in that: The number N of the sample cups satisfies, (T3+T4-T5) / (T6-T1-T2)≤N≤T / T6, T1 is the dilution time of a single sample, T2 is the addition time of the color developing reagent of a single sample, T3 is the color development time, T4 is the extraction time, T5 is the standing time after extraction, T6 is the detection time of a single sample, and T is the longest stability time of the detection substance; The processing unit comprises a first mechanical arm and a reagent applying module, wherein the reagent applying module is arranged on the first mechanical arm, and the first mechanical arm is arranged at a processing position; The detection unit comprises a second mechanical arm, an injection needle and a detection module, wherein the injection needle is arranged on the second mechanical arm and is connected to the detection module; The detection module comprises: A multi-channel selector valve, wherein the ports of the multi-channel selector valve are respectively connected to the injection needle, the waste liquid bucket, the detection channel and the chloroform, and the common end is connected to the quantitative pump. A heater, a filter and a circulation pool are sequentially arranged on the detection channel; A switching module is used to selectively connect the outlet of the filter to chloroform or a circulation pool.

2. The water quality detection device based on batch sequential step-in according to claim 1 is characterized in that: When direct detection is used, T4=T5=0; when extraction method is used, T1=0.

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