Automatic sampling and diluting device

Abstract

The utility model relates to an automatic sampling and diluting device which comprises a sample tank, a dilution cup siphon constant volume pipe is arranged in the dilution cup and is used for carrying out constant volume on the sample extracted into the dilution cup; the sampling diaphragm pump is used for extracting a certain amount of sample into the dilution cup from the sample groove; a pure water siphon constant volume pipe is arranged in the pure water cup, and the pure water siphon constant volume pipe is used for fixing the volume of the extracted pure water; and the pure water transfer pump is used for pumping the constant-volume pure water in the pure water cup into the dilution cup. According to the utility model, the sampling and diluting precision and accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dilution processes, and particularly to an automatic sampling and dilution device. Background Art

[0002] Currently, the main automatic dilution devices use syringes and multi-way valves for sampling and dilution. The accuracy of the syringe itself is limited, and there will be errors in the sampling accuracy itself. Moreover, the metering range of the syringe is limited and is only suitable for the preparation of solutions with a small dilution volume. As the use time goes by, the syringe and multi-way valve will wear, resulting in greater sampling errors. Eventually, the dilution accuracy will be greatly reduced, and the analyzer cannot accurately test the true value of the bath solution, which will further lead to inaccuracies in the subsequent processes, affect product quality, be unfavorable for production control, and cause economic losses. Summary of the Invention

[0003] The utility model provides an automatic sampling and dilution device to solve the following problems: the existing sampling and dilution devices have disadvantages such as low accuracy and limited metering range of the syringe, resulting in increased sampling errors, and cannot ensure the accuracy and precision of sample extraction and dilution.

[0004] According to one aspect of the utility model, an automatic sampling and dilution device is provided, including:

[0005] A sample tank;

[0006] A dilution cup, in which a dilution cup siphon constant volume tube is arranged for constant volume of the sample drawn into the dilution cup;

[0007] A sampling diaphragm pump for drawing a certain amount of sample from the sample tank into the dilution cup;

[0008] A pure water tank, in which a pure water siphon constant volume tube is arranged, and the pure water siphon constant volume tube is used for constant volume of the drawn pure water.

[0009] Preferably, a sample reflux peristaltic pump is connected to the lower end of the dilution cup, and the other end of the sample reflux peristaltic pump is connected to the sample tank, for returning the rinsed sample to the sample tank after the sample enters the dilution cup for rinsing.

[0010] Preferably, the dilution cup siphon constant volume tube is connected to a sample back-pumping constant volume peristaltic pump for pumping out the excess sample after sample constant volume.

[0011] Preferably, the pure water siphon constant volume tube is connected to a pure water back-pumping constant volume peristaltic pump for pumping out the excess pure water after pure water constant volume.

[0012] Preferably, a pinch valve is connected between the dilution cup and the sample reflux peristaltic pump to prevent liquid leakage during stirring.

[0013] Preferably, the dilution cup is further connected with a sample extraction pump for extracting the diluted diluent to the analysis unit.

[0014] Preferably, high-level warning devices and low-level warning devices are respectively arranged at the upper and lower cup sides of the dilution cup and the pure water cup for alarming abnormal liquid levels.

[0015] Preferably, the pure water cup is further connected with a pure water solenoid valve for extracting pure water into the pure water cup and controlling the on-off of the pure water.

[0016] Preferably, a mixing and stirring peristaltic pump (7) is further included, which is also connected to the dilution cup (5) through a pinch valve (3).

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1) The automatic sampling and dilution device of the present utility model has high precision and is easy to control. As long as the height of the siphon constant volume tube remains unchanged, the sampling is quantitative each time, and it is not affected by hardware wear, ensuring the accuracy of dilution.

[0019] 2) The sampling volume of the automatic sampling and dilution device of the present utility model is larger, not affected by the sampling volume, and can be customized according to actual needs. The more samples are taken, the smaller the sampling error.

[0020] 3) The automatic sampling and dilution device of the present utility model is not affected by wear, does not need to be replaced, saves manpower and material resources, and has high accuracy and stability, which is beneficial to production control.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present utility model.

[0022] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present utility model will become clear. Description of the Drawings

[0023] The accompanying drawings here are incorporated into the specification and form a part of this specification. These drawings show embodiments conforming to the present utility model and are used together with the specification to explain the technical solutions of the present utility model.

[0024] Figure 1 The structural schematic diagram of the automatic sampling and dilution device is shown.

[0025] Reference Signs

[0026] 1. Sample tank; 2. Sampling diaphragm pump; 3. Pinch valve; 4. Sample reflux peristaltic pump; 5. Dilution cup; 6. Sample backflush constant volume peristaltic pump; 7. Mixing and stirring peristaltic pump; 8. Pure water solenoid valve; 9. Pure water cup; 10. Pure water backflush constant volume peristaltic pump; 11. Pure water transfer pump; 12. Sample extraction pump; 13. High liquid level warning device; 14. Low liquid level warning device; 15. Dilution cup siphon constant volume tube; 16. Pure water siphon constant volume tube. Detailed implementation mode

[0027] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following embodiments specifically elaborate on the automatic sampling and dilution device of the present utility model.

[0028] Existing automatic sampling and dilution devices mainly use syringes and multi-way valves for sampling and dilution. The syringe itself has limited accuracy, and there will be errors in the sampling accuracy itself; moreover, the measurement range of the syringe is limited and is only suitable for preparing solutions with a small dilution volume; as the use time goes by, the syringe and multi-way valve will wear, resulting in greater sampling errors. Eventually, the dilution accuracy will be greatly reduced, and the analyzer analysis cannot well test the true value of the bath solution, which will further lead to inaccuracies in the subsequent processes, affect product quality, is not conducive to production control, and brings economic losses. To solve these problems, an automatic sampling and dilution device is proposed to improve the accuracy and precision of sample extraction and dilution.

[0029] Embodiment 1

[0030] An embodiment of the present utility model proposes an automatic sampling and dilution device. Figure 1 The structure diagram of the automatic sampling and dilution device is shown.

[0031] The automatic sampling and dilution device includes:

[0032] A sample tank 1 for storing the sample to be diluted;

[0033] A dilution cup 5, in which a dilution cup siphon constant volume tube 15 is provided for constant volume of the sample drawn into the dilution cup 5;

[0034] Further, the dilution cup siphon constant volume tube 15 is connected to the sample backflush constant volume peristaltic pump 6 for extracting the excess sample after sample constant volume.

[0035] A sample reflux peristaltic pump 4 is connected to the lower end of the dilution cup 5, and the other end of the sample reflux peristaltic pump 4 is connected to the sample tank 1 for returning the rinsed sample to the sample tank 1 after the sample enters the dilution cup 5 for rinsing.

[0036] Further, a pinch valve 3 is connected between the dilution cup 5 and the sample reflux peristaltic pump 4 to prevent liquid leakage during stirring.

[0037] Sampling diaphragm pump 2, the sample tank 1 is connected to the dilution cup 5 through the sampling diaphragm pump 2, and is used to extract a certain amount of sample from the sample tank 1 into the dilution cup 5;

[0038] Pure water cup 9, a pure water siphon constant volume tube 16 is arranged in the pure water cup 9, and the pure water siphon constant volume tube 16 is used to perform constant volume on the extracted pure water; the pure water siphon constant volume tube 16 is connected to the pure water back-pumping constant volume peristaltic pump 10, and is used to extract the excess pure water after the pure water is fixed in volume.

[0039] Further, the pure water cup 9 is also connected with a pure water solenoid valve 8, which is used to extract pure water into the pure water cup 9 and control the on-off of the pure water.

[0040] The dilution cup 5 is connected to the pure water cup 9 through a pure water transfer pump 11, and is used to extract the pure water with a fixed volume in the pure water cup 9 into the dilution cup 5; the dilution cup 5 is also connected with a mixing and stirring peristaltic pump 7, which is used to stir and dilute the sample and pure water in the dilution cup 5.

[0041] Further, a high liquid level warning device 13 and a low liquid level warning device 14 are respectively arranged at the upper and lower cup side positions of the dilution cup 5 and the pure water cup 9. If the liquid volume of the dilution cup 5 or the pure water cup 9 is higher than the high liquid level and / or lower than the low liquid level, an alarm prompt will be issued, the dilution operation will stop, and an inspection will be carried out.

[0042] The dilution cup 5 is also connected with a sample extraction pump 12, which is used to extract the diluted dilution liquid to the analysis unit.

[0043] The automatic sampling and dilution of the present utility model is realized through the following steps:

[0044] S10, open the pure water solenoid valve 8 to extract pure water into the pure water cup 9. The amount of pure water needs to touch the pure water siphon constant volume tube 16. Open the pure water back-pumping constant volume peristaltic pump 10 to perform constant volume on the extracted pure water by using the pure water siphon constant volume tube 16, and fix the pure water volume as V2;

[0045] S20, open the sampling diaphragm pump 2 to pump the sample from the sample tank 1 to the dilution cup 5 for rinsing, and open the sample reflux peristaltic pump 4 to reflux the rinsed sample back to the sample tank 1;

[0046] S30, open the sampling diaphragm pump 2 again to officially extract the sample to the dilution cup 5, open the sample back-pumping constant volume peristaltic pump 6, and use the dilution cup siphon constant volume tube 15 to perform constant volume on the extracted sample, so that the sample volume needs to submerge the dilution cup siphon constant volume tube 15. Utilize the siphon principle to fix the sample volume to a fixed volume V1;

[0047] In S40, turn on the pure water transfer pump 11 to transfer the volumetrically fixed pure water into the dilution cup 5. Turn on the mixing and stirring peristaltic pump 7 to stir and dilute the volumetrically fixed sample and the volumetrically fixed pure water, and stir the diluent evenly. Open the pinch valve 3 to prevent liquid leakage during stirring.

[0048] After S40, the following steps are further included:

[0049] Turn on the sample extraction pump 12 to extract a quantitatively diluted diluent from the dilution cup 5 to the analysis unit.

[0050] In S40, a high liquid level warning device 13 and a low liquid level warning device 14 are respectively provided at the upper and lower cup side positions of the dilution cup 5 and the pure water cup 9. If the liquid volume in the dilution cup 5 or the pure water cup 9 is higher than the high liquid level and / or lower than the low liquid level, an alarm prompt is issued, the dilution operation stops, and an inspection is carried out.

[0051] Based on the description of the above embodiments, the following technical effects can be achieved by the embodiments of the present utility model:

[0052] 1) The automatic sampling and dilution device of the present utility model has high precision and is easy to control. As long as the height of the siphon volumetric tube remains unchanged, each sampling is quantitative, not affected by hardware wear, and can ensure the accuracy of dilution.

[0053] 2) The automatic sampling and dilution device of the present utility model has a larger sampling volume, is not affected by the sampling volume, can be customized according to actual needs, and the more samples are taken, the smaller the sampling error.

[0054] 3) The automatic sampling and dilution device of the present utility model is not affected by wear, does not need to be replaced, saves manpower and material resources, and the device has high accuracy and stability, which is beneficial to production control.

[0055] The above has described the embodiments of the present utility model. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technologies in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. An automatic sampling and dilution device, characterized in that: include: Sample slot (1); A dilution cup (5), wherein a dilution cup siphon constant volume tube (15) is arranged in the dilution cup (5) and is used to constant the volume of the sample drawn into the dilution cup (5); A sampling diaphragm pump (2) extracts a certain amount of sample from the sample tank (1) into a dilution cup (5); a pure water cup (9) is provided with a pure water siphon constant volume tube (16) in the pure water cup (9), and the pure water siphon constant volume tube (16) is used to constant the volume of the extracted pure water; The pure water transfer pump (11) is used to pump the pure water after the volume is fixed in the pure water cup (9) into the dilution cup (5).

2. The automatic sampling and dilution device according to claim 1, characterized in that: A sample reflux peristaltic pump (4) is connected to the lower end of the dilution cup (5), and the other end of the sample reflux peristaltic pump (4) is connected to the sample tank (1) so as to return the rinsed sample to the sample tank (1) after the sample enters the dilution cup (5) for rinsing.

3. The automatic sampling and dilution device according to claim 1, characterized in that: The dilution cup siphon constant volume tube (15) is connected to the sample back-drawing constant volume peristaltic pump (6) and is used to extract excess sample after the sample is constant volume.

4. The automatic sampling and dilution device according to claim 1, characterized in that: The pure water siphon constant volume tube (16) is connected to the pure water back-draw constant volume peristaltic pump (10) and is used to extract excess pure water after the pure water is constant volume.

5. The automatic sampling and dilution device according to claim 1, characterized in that: A pinch valve (3) is connected between the dilution cup (5) and the sample reflux peristaltic pump (4) to prevent liquid leakage during stirring.

6. The automatic sampling and dilution device according to claim 1, characterized in that: The dilution cup (5) is also connected to a sample extraction pump (12) for extracting the diluted dilution solution to the analysis unit.

7. The automatic sampling and dilution device according to claim 1, characterized in that: A high liquid level alarm (13) and a low liquid level alarm (14) are respectively provided at the upper and lower cup sides of the dilution cup (5) and the pure water cup (9) for alarming abnormal liquid levels.

8. The automatic sampling and dilution device according to claim 1, characterized in that: The pure water cup (9) is also connected to a pure water solenoid valve (8) for extracting pure water into the pure water cup (9) and controlling the on and off of the pure water.

9. The automatic sampling and dilution device according to claim 1, characterized in that: It also includes a mixing and stirring peristaltic pump (7), which is also connected to the dilution cup (5) through the pinch valve (3).

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