CN202093004U - Automatic ion chromatography sample introduction device - Google Patents

Abstract

An automatic sampling device for ion chromatography, the driving power of the sample bottle drives at least two sample bottles to move on the horizontal plane, the driving power of the sampling tube drives the sampling tube to move vertically, the sampling tube is connected to the sampling pump, and the axes of the sample bottle and the sampling tube are parallel ; The projection of the sampling tube on the horizontal plane falls in the sample bottle on the working position; the driving power of the sample bottle, the driving power of the sampling tube and the sampling pump are connected to the control system. The utility model can automatically inject two or more samples, and has high sampling efficiency and high cost performance. The parts of the automatic sampling device can be produced domestically, and the price is cheap and the assembly is easy.

Description

Autosampler for Ion Chromatography

technical field

The utility model relates to a sampling device for cutting a solution into an ion chromatography flow path, in particular to an automatic sampling device for the ion chromatography.

Background technique

Due to technical reasons, currently domestically produced ion chromatography instruments generally use imported manual injection valves. The manual injection valve is limited and restricted by the control method, and it can only work intermittently once. When testing each sample, it is necessary to manually place the valve at the injection control position, inject the sample solution to be tested into the ion chromatograph, and then manually open the valve. Placed in analytical control position. Manual sample injection takes manpower, has low efficiency, and is difficult to realize automatic detection. In addition, the imported manual injection valve still has the problems of high price and long delivery cycle.

Utility model content

The utility model aims to solve the technical problems of the single intermittent operation of the existing manual sampling valve, which takes up manual operation and has low efficacy; the imported manual sampling valve is expensive and has a long supply cycle, and provides a device that can automatically inject more than two samples. Sample, high injection efficiency, cost-effective domestic ion chromatography automatic sampling device.

In order to solve the above technical problems, the technical solution adopted by the utility model is: an automatic sampling device for ion chromatography, including a sample bottle, the driving power of the sample bottle drives at least two sample bottles to move on the horizontal plane, and the driving power of the sampling tube drives the sampling The tube moves vertically, the sampling tube is connected to the sampling pump, and the axes of the sample bottle and the sampling tube are parallel; the projection of the sampling tube on the horizontal plane falls into the sample bottle at the working position; the driving power of the sample bottle, the driving power of the sampling tube and the sampling pump are connected Control System.

Under the control of the control system, the driving power of the sample bottle, the driving power of the sampling tube and the sampling pump cooperate to complete automatic sampling. The sample bottle driving power drives the sample bottle to stop at the working position in sequence. Driven by the driving power of the sampling tube, the sampling tube extends into the liquid in a sample bottle stopped at the working position, and the liquid is transported by the sampling pump to the detection flow path of the ion chromatography through the sampling tube; the driving power of the sampling tube drives the sampling tube to rise Driven by the driving power of the sample bottle, the other sample bottle stops at the working position, the driving power of the sampling tube drives the sampling tube to extend into the liquid of the other sample bottle, and the liquid is transported by the sampling pump to the In the detection flow path of ion chromatography, in this way, automatic sampling is realized. The utility model can automatically inject two or more samples, and has high sampling efficiency and high cost performance. The parts of the automatic sampling device can be produced domestically, and the price is cheap and the assembly is easy. There are many existing technologies that can realize the movement of the sample vial driving power, such as the sample vial driving power motor, through the gear on the main shaft meshing with the rack on the bracket supporting the sample vial, driving the vial to move back and forth on the horizontal plane ; Another example is the sample bottle driving power motor, through which the gear on the main shaft meshes with the gear on the central axis of the bracket supporting the sample bottle, driving the sample bottle to make a circular motion on the horizontal plane and so on. There are many existing technologies that can realize the sampling tube driving power to drive the sampling tube to move. For example, the sampling tube drives the power motor, and the gear on the horizontal spindle meshes with the vertical rack fixedly connected to the sampling tube bracket to drive the sampling tube to move in the vertical direction. ; Another example is that the sampling tube drives the power motor to drive the sprocket to rotate, the sampling tube is fixed on the chain meshed with the sprocket, and the sampling tube drives the power motor to drive the sampling tube to move in the vertical direction and so on.

The sample bottle is placed on the bracket consisting of the upper tray and the lower tray. The driving power of the sample bottle is the sample bottle driving stepping motor, and the output shaft of the sample bottle driving stepping motor is concentrically fixedly connected with the central axis of the bracket. The sample bottle is driven by a stepper motor to drive the sample bottle to make a circular motion on the horizontal plane.

The rear end of the sampling tube is fixedly connected to the sampling tube bracket. The driving power of the sampling tube is the sampling tube driving stepping motor. The sampling tube driving stepping motor is fixed on the base of the automatic sampling device. The output shaft of the sampling tube driving the stepping motor is connected to the screw. , the screw mandrel cooperates with the screw nut on the sampling tube bracket. The sampling tube drives the stepper motor to drive the sampling tube to move vertically.

There are an even number of sample bottles, and the sample bottles hold the sample solution to be tested and the eluent respectively, and the sample bottles for the sample solution to be tested and the sample bottles for the eluent are arranged alternately. The sampling tubes alternately extend into the sample bottle containing the sample solution to be tested and the sample bottle containing the eluent, and the sampling tube that is contaminated with the sample solution to be tested is cleaned by the eluent to avoid the occurrence of contamination between the samples to be tested. Influence.

The sampling tube is a suction needle in the shape of a hollow needle. The aspiration needle is similar to an injection needle, and the liquid in the sample bottle is sucked out from the hollow cavity of the aspiration needle.

After the sample bottle is filled with the sample solution to be tested, its upper opening is covered with a parafilm. The sealing film is used to prevent dust and prevent the sample from being oxidized by air, and the sampling tube pierces the sealing film and extends into the liquid in the sample bottle.

The liquid level in the sample bottle containing the eluent is higher than the liquid level in the sample bottle containing the sample solution to be tested. To ensure that each sample bottle containing the eluent can effectively clean the outer surface of the sampling tube to avoid contamination of the sample.

The utility model has the advantages that: the utility model can automatically inject two or more samples, has high sampling efficiency and high cost performance, and the parts of the automatic sampling device can be produced domestically, with low price and easy assembly.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the utility model;

FIG. 2 is a top view of FIG. 1 .

Detailed ways

Description with reference to the accompanying drawings. In order to show clearly, in Fig. 1, the front side of the slide housing 5 is removed, and the upper tray 1 and the lower tray 15 where the sample bottle 2 bracket is placed are partially taken in section.

The 40 tops of the present embodiment are cylindrical and the bottoms are tapered sample bottles 2 that are evenly placed in 40 through holes at the outer edge of the circular upper tray 1. The upper tray 1 and the lower tray 15 made of refined aluminum alloy have a diameter of Similarly, there is a tapered hole on the lower tray 15 opposite to the center of the through hole of the upper tray 1 for the tapered positioning of the lower end of the sample bottle. Fixing screws 3 fasten and connect the upper tray 1 and the lower tray 15 at intervals and concentrically to form a placement bracket for the sample bottle 2 . The drive power of the sample bottle is 0.9 degrees for each pulse step angle, DC+24V/2A three-phase four-beat sample bottle drive stepper motor 14, the output shaft of the sample bottle drive stepper motor is concentrically fixedly connected with the central axis 16 of the bracket , the sample bottle drives the stepper motor 14 to drive the sample bottle 2 to make a circular motion on the horizontal plane. The sampling tube in this embodiment is a hollow needle-shaped suction needle 7 made of stainless steel. The rear end of the suction needle 7 is fixedly connected to the sampling tube bracket. The driving power of the sampling tube is 0.9 degrees per pulse step angle, DC+24V/2A The three-phase four-beat sampling tube driving stepper motor 10 is fixed on the sliding table shell 5, and its vertical output shaft is connected with a high-precision screw 8, and the screw 8 is connected to the screw on the sampling tube bracket. The female cooperates, and the sampling tube drives the stepper motor 10 to drive the suction needle 7 to move up and down along the motion track 9 of the needle suction, and the female wire is not shown in the figure. The sliding table shell 5 made of plastic blocks the dust and other impurities in the external space of the ion chromatography automatic sampling device from entering the inside of the sliding table. The sample bottle 2 holds the sample solution to be tested and the eluent respectively. In order to prevent the high-concentration sample from polluting the low-concentration sample to be tested, the sample bottle 2 containing the sample solution to be tested and the eluent The sample bottles 2 are arranged alternately, and the liquid level in the sample bottle containing the eluent is higher than the liquid level in the sample bottle containing the sample solution to be tested. After the sample bottle 2 is filled with the sample solution to be tested, its upper opening is covered with a sealing film. The sample bottle drives the stepper motor 14 to drive the sample bottle 2 to rotate 9 degrees around the central axis 16 each time, and the 40 sample bottles 2 stop at the working position in turn, and the suction needle 7 is connected to the sampling pump. The sampling pump in this embodiment is a peristaltic pump 13. The pipeline 11 connects the peristaltic pump 13 and the suction needle 7 . The axes of the sample bottle 2 and the suction needle 7 are parallel; the projection of the suction needle 7 on the horizontal plane falls in the sample bottle 2 at the working position. The sample vial drive stepping motor 14, the peristaltic pump 13, and the sliding table shell 5 are fixedly installed on the base 12 of the automatic sampling device. The driving power of the sample bottle, the driving power of the sampling tube and the sampling pump are connected to the control system, and under the control of the control system, the driving power of the sample bottle, the driving power of the sampling tube and the sampling pump act in coordination to complete automatic sampling.

The working process of this embodiment is as follows: after the power is turned on, the suction needle 7 is driven to the middle and upper part of the screw mandrel 8 under the driving of the sampling tube driving stepping motor 10; the sample bottle driving stepping motor 14 is driven under the control of the control board The sample bottle 2 returns to the initial position with the placement bracket; after that, the sampling tube drives the stepper motor 10 to control the suction needle 7 to drop into the first sample bottle 2, and the peristaltic pump 13 is turned on to suck the sample solution to be tested, and the sample injection is completed Finally, close the peristaltic pump 13; control the sampling tube to drive the stepper motor 10 to lift the suction needle 7 and return to the middle and upper part of the screw mandrel 8. Subsequently, the ion chromatograph starts to detect and analyze the sample to be tested. After the detection and analysis of the sample to be tested is completed, the sample bottle is controlled to drive the stepper motor 14 to rotate, and the next sample bottle 2 is on the trajectory line of the needle suction trajectory 9, and the suction needle 7 is dropped in the sample bottle 2, and the peristaltic pump is turned on 7. Aspirate the eluent to rinse the outer surface of the suction needle 7 and the entire sampling pipeline. After flushing, close the peristaltic pump 7, control the sampling tube to drive the stepper motor 10 to lift the suction needle 7 to the middle and upper part of the screw mandrel 8 again. This is repeated until all the samples are detected and analyzed, and the ion chromatography automatic sampling device returns to the starting position. So far, all the sample injection and pipeline cleaning procedures have been completed.

Claims (7)

1. the automatic sampling apparatus of a chromatography of ions, comprise sample bottle (2), it is characterized in that sample bottle drives at least two sample bottles of power drive (2) and moves on surface level, stopple coupon drives the power drive stopple coupon and does vertical movement, stopple coupon is communicated with sampling pump, the parallel axes of sample bottle (2) and stopple coupon; The projection of stopple coupon on surface level drops in the sample bottle on the working position; Sample bottle drives power, stopple coupon drives power and sampling pump connection control system.

2. the automatic sampling apparatus of chromatography of ions according to claim 1, it is characterized in that sample bottle (2) is placed on the carriage of being made up of upper tray (1) and lower tray (15), it is sample bottle drive stepping motor (14) that sample bottle drives power, sample bottle drive stepping motor output shaft and concentric the fixedlying connected of carriage central shaft (16).

3. the automatic sampling apparatus of chromatography of ions according to claim 1, the fixedly connected stopple coupon support in rear end that it is characterized in that stopple coupon, it is stopple coupon drive stepping motor (10) that stopple coupon drives power, stopple coupon drive stepping motor (10) is fixed on the automatic sampling apparatus base (12), the output shaft of stopple coupon drive stepping motor (10) connects screw mandrel (8), and screw mandrel (8) cooperates with screw on the stopple coupon support.

4. the automatic sampling apparatus of chromatography of ions according to claim 1, it is characterized in that sample bottle (2) has even number, sample bottle (2) holds testing sample solution and leacheate respectively, holds the sample bottle (2) of testing sample solution and holds sample bottle (2) interphase distribution of leacheate.

5. the automatic sampling apparatus of chromatography of ions according to claim 1 is characterized in that stopple coupon is the suction spindle (7) that is hollow needle.

6. according to the automatic sampling apparatus of claim 1 or 2 or 4 described chromatography of ions, it is characterized in that sample bottle (2) holds testing sample solution after, film is sealed in its covering suitable for reading.

7. the automatic sampling apparatus of chromatography of ions according to claim 4 is characterized in that the interior liquid level of sample bottle that holds leacheate is higher than liquid level in the sample bottle that holds testing sample solution.

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