CN222774372U - Automatic sample dilution device - Google Patents

Abstract

The utility model discloses an automatic sample diluting device which comprises a sampling mechanism and a cleaning mechanism, wherein the cleaning mechanism comprises a cleaning sleeve, a cleaning introducing pipe and a cleaning discharging pipe are communicated with the side part of the cleaning sleeve, a sampling arm of the sampling mechanism is driven by a ball screw nut pair driven by a stepping motor I to do lifting and lowering movements along a left linear guide pair and a right linear guide pair, a double-cavity needle tube sampling needle which downwards penetrates through the cleaning sleeve and is aligned with a sampling test tube is arranged at the overhanging end of the sampling arm, one cavity tube is connected with the sampling tube, the other cavity tube is connected with the sampling test tube, the sampling needle extends into the sampling test tube at a limiting position where the sampling arm descends, the needle point at the lower end of the sampling needle does not touch the bottom of the sampling test tube, and the sampling needle exits the sampling test tube at a limiting position where the sampling arm ascends, and the needle point of the sampling needle is positioned in the cleaning sleeve. The utility model improves the detection efficiency of the instrument, saves the sampling consumable material and solves the defect that the sample is polluted because the manual work is difficult to clean completely.

Description

Automatic sample diluting device

Technical Field

The utility model relates to a detection technology, in particular to an automatic sample diluting device.

Background

Sample dilution is a common experimental operation means, and the concentration of the test solution can be reduced in the experiment, so that the concentration range is controlled in a proper measurement range, and more accurate results can be obtained.

Currently, in analytical chemistry and medical testing applications, sample dilution is performed by manually adding a dilution solution to a fixed volume using a pipette or pipette to separate the mother liquor. In the continuous dilution process, the manual operation error is large and the time is long, and the existing dilution means can not quickly and effectively clean the suction nozzle of a pipette or a pipette in the working process, so that sample pollution is caused.

Disclosure of utility model

The utility model provides an automatic sample diluting device, which aims to solve the technical problems that in the prior art, the sample diluting means is low in efficiency and difficult to clean completely in the sampling process, so that the sample is polluted.

The technical scheme of the sample automatic diluting device capable of solving the technical problems comprises a sampling mechanism and a cleaning mechanism, and is characterized in that:

1. The cleaning mechanism comprises a cleaning sleeve, and a cleaning introducing pipe and a cleaning discharging pipe are communicated with the side part of the cleaning sleeve.

2. The sampling mechanism comprises a sampling arm, the sampling arm is driven by a ball screw nut pair driven by a stepping motor I to do lifting motion along a left linear guide pair and a right linear guide pair, a sampling needle which downwards penetrates through a cleaning sleeve and is aligned with a sampling test tube is arranged at the overhanging end of the sampling arm, the sampling needle is a double-cavity needle tube, one cavity tube is connected with a sampling tube, and the other cavity tube is connected with the sampling test tube.

3. At the limiting position of the descending of the sampling arm, the sampling needle stretches into the sampling test tube, and the needle point at the lower end of the sampling needle does not touch the bottom of the sampling test tube.

4. In the limit position of the ascending of the sampling arm, the sampling needle withdraws from the sampling test tube and the needle tip of the sampling needle is positioned in the cleaning sleeve.

Further, one structure of the ball screw nut pair comprises a screw rod and a ball screw nut which are matched with each other, the ball screw nut is arranged in the sampling arm, the upper shaft end of the screw rod is connected with a rotating shaft of a stepping motor I, and the stepping motor I is arranged on the top of the sampling frame.

Further, one structure of each linear guide pair comprises a guide rod and ball linear bearings which are matched with each other, the left ball linear bearing and the right ball linear bearing are arranged in the sampling arm at two sides of the ball screw nut, and the left guide rod and the right guide rod are arranged between the top and the bottom of the sampling frame.

Further, upper and lower limiting positions are respectively provided with an upper photoelectric sensor and a lower photoelectric sensor which are arranged on the side parts of the sampling frame, and the sampling arm is provided with a photoelectric sensor baffle I which can be respectively sensed by the upper and lower photoelectric sensors.

Conventionally, the technical scheme of the utility model also comprises a turntable mechanism, wherein a plurality of sampling test tubes are uniformly distributed in the turntable of the turntable mechanism in circumference, and the turntable is driven by a synchronous pulley transmission pair driven by a stepping motor II to perform rotary motion so as to rotate each sampling test tube to a sampling position.

The utility model has the beneficial effects that:

1. The utility model can be matched with a detection instrument to perform sample dilution treatment, such as automatic sampling of a test tube, automatic liquid adding dilution, automatic detection, and cleaning of a sampling needle and a liquid path after completion, and particularly under the condition of a large number of samples, the utility model can effectively reduce manual steps and improve the detection efficiency of the instrument.

2. In the structure of the utility model, the sampling mechanism, the cleaning mechanism and the turntable mechanism are matched together, thereby realizing the operation of circulating, accurate and automatic sampling dilution and cleaning.

3. By adopting the utility model, disposable sampling suction nozzle consumable materials are not needed, so that the cost is effectively saved, and the utility model is energy-saving and environment-friendly.

Drawings

Fig. 1 is an isometric view of one embodiment of the utility model.

Fig. 2 is an exploded view of the embodiment of fig. 1.

Fig. 3 is a first perspective isometric view of the sampling mechanism of the embodiment of fig. 1.

Fig. 4 is a second perspective isometric view of the sampling mechanism of the embodiment of fig. 1.

The drawing number mark comprises 1, a sampling arm, 2, a stepping motor I, 3, a sampling needle, 4, a sampling tube, 5, a sampling test tube, 6, a cleaning sleeve, 7, a cleaning inlet tube, 8, a cleaning discharge tube, 9, a sampling test tube, 10, a screw rod, 11, a ball screw nut, 12, a guide rod, 13, a ball linear bearing, 14, a sampling frame, 15, an upper photoelectric sensor, 16, a lower photoelectric sensor, 17, a photoelectric sensor baffle I, 18, a turntable, 19, a stepping motor II, 20, a synchronous pulley transmission pair, 21, a base, 22, a cleaning frame, 23, a motor seat, 24, a photoelectric sensor baffle II, 25 and a zero photoelectric sensor.

Detailed Description

The technical scheme of the utility model is further described below with reference to the embodiment shown in the drawings.

The automatic sample diluting device comprises a sampling mechanism, a cleaning mechanism and a turntable mechanism which are arranged on the basis of a base 21, as shown in fig. 1 and 2.

The sampling mechanism is arranged on the rear left side of the base 21 and comprises a sampling frame 14 fixedly arranged on the base 21, the sampling frame 14 comprises a top plate, a bottom plate and a side plate connected to the rear sides of the top plate and the bottom plate, a stepping motor I2 is arranged on the top plate, a sampling arm 1 is arranged between the top plate and the bottom plate, a ball screw nut pair is arranged between the top plate and the bottom plate and positioned between the stepping motor I2 and the bottom plate, the ball screw nut pair comprises a screwed screw 10 and a ball screw nut 11, the upper part and the lower end of the screw 10 are respectively arranged on the top plate and the bottom plate through bearings, the upper end of the screw 10 passes through the top plate and is connected with a downward rotating shaft of the stepping motor I2, the ball screw nut 11 is arranged in the sampling arm 1, the stepping motor I2 drives the sampling arm 1 to ascend and descend along left and right linear guide pairs between the top plate and the bottom plate through the ball screw nut pair, each linear guide pair comprises a guide rod 12 and a ball linear bearing 13 which are in sliding fit, the left and right linear guide rods 12 are vertically arranged between the top plate and the bottom plate on two sides of the screw 10, and the left and right linear guide rods 13 are respectively arranged in the two sides of the ball bearings 11, as shown in fig. 1 and 3 and fig. 2 show that the two are arranged in the inside the figures 1 and 4 and 3.

The right end of the sampling arm 1 is a cantilever, a sampling needle 3 is vertically and downwardly arranged in a hole at the right end of the cantilever, the sampling needle 3 is a double-cavity needle tube, the downward corresponding position of the sampling needle 3 is a sampling position and is positioned at the top of the sampling needle 3, one cavity tube is connected with a sampling tube 4 positioned above the sampling arm 1, the other cavity tube is connected with a sampling test tube 5 positioned above the sampling arm 1, a backward extending photoelectric sensor baffle I17 is arranged on the cantilever, an upper photoelectric sensor 15 and a lower photoelectric sensor 16 are arranged on a side plate of the sampling frame 14 corresponding to the photoelectric sensor baffle I17, and when the sampling arm 1 ascends and descends, the photoelectric sensor baffle I17 senses with the upper photoelectric sensor 15 and the lower photoelectric sensor 15 respectively to limit the ascending and descending height position of the sampling arm 1, as shown in figures 1, 2, 3 and 4.

The cleaning mechanism comprises a cleaning sleeve 6, an upper interface and a lower interface at the side part of the cleaning sleeve 6 are respectively communicated with a cleaning introducing pipe 7 and a cleaning discharging pipe 8, the sampling needle 3 penetrates through the cleaning sleeve 6, the cleaning sleeve 6 is arranged on a side plate of a sampling frame 14 through a cleaning frame 22, the installation height of the cleaning sleeve 6 corresponds to that of an upper photoelectric sensor 15, namely, when the sampling arm 1 stops at a rising limiting position, the needle point at the lower end of the sampling needle 3 is positioned inside the cleaning sleeve 6, as shown in figures 1, 2, 3 and 4.

The automatic sampling device is characterized in that the turntable mechanism is arranged on the right side of the sampling mechanism, an I-shaped turntable 18 of the turntable mechanism is arranged on a base 21 through a rotating shaft, a stepping motor II19 which is arranged on the base 21 through a motor seat 23 is arranged on the front side of the turntable 18, the stepping motor II19 is connected with the rotating shaft through a synchronous pulley transmission pair 20, the synchronous pulley transmission pair 20 comprises a driving pulley and a driven pulley which are connected through a synchronous belt, the driving pulley is arranged on the downward rotating shaft of the stepping motor II19, the driven pulley is arranged on the rotating shaft between the turntable 18 and the base 21, upper and lower aligned inserting holes are uniformly distributed on the circumference of the turntable 18, a sampling test tube 9 can be correspondingly placed in each upper and lower inserting hole, the stepping motor II19 drives the turntable 18 to conduct circular rotation through the synchronous pulley transmission pair 20, the sampling test tube 9 rotates to a sampling position, a zero photoelectric sensor 25 is further arranged on the base 21, and a photoelectric sensor baffle II24 is arranged on the lower part of the turntable 18 corresponding to the zero photoelectric sensor 25, and the photoelectric sensor baffle II24 triggers the zero photoelectric sensor 25 to calibrate the zero position of the turntable 18 once, and the sampling test tube 9 can be accurately calibrated each time, as shown in the figure 1 and the position of the test tube is shown in the figure 2.

The sample automatic dilution device adopts the following steps:

1. The initial position of the turntable 18 is calibrated, and then the N sampling test tubes 9 containing the samples are placed in the corresponding insertion holes on the turntable 18.

2. The stepper motor II19 is activated and the rotating turntable 18 rotates the first sample tube 9 to the sampling position.

3. The stepping motor I2 is started, the sampling arm 1 drives the sampling needle 3 to descend (extend out of the cleaning sleeve 6) and extend into the sampling test tube 9 until the photoelectric sensor baffle I17 and the lower photoelectric sensor 16 are sensed and stopped, and at the moment, the needle tip of the sampling needle 3 does not touch the bottom of the sampling test tube 9.

4. The sampling dilution work is performed by the sampling tube 4, and the sampling detection work is performed by the sampling tube 5.

5. After the dilution and sampling detection are finished, the stepping motor I2 is started, the sampling arm 1 drives the sampling needle 3 to ascend and move out of the sampling test tube 9 until the photoelectric sensor baffle I17 and the upper photoelectric sensor 15 are induced to stop, and at the moment, the needle tip of the sampling needle 3 returns to the inside of the cleaning sleeve 6.

6. The cleaning liquid is injected into the cleaning sleeve 6 through the cleaning introducing pipe 7 to clean the needle tip surface and the needle hole of the sampling needle 3, and the cleaning liquid is rapidly pumped out of the cleaning sleeve 6 through the cleaning discharging pipe 8 to complete the cleaning process.

7. The stepper motor II19 is activated and the rotating turntable 18 rotates the next sample tube 9 to the sampling position and the diluted first sample tube 9 is rotated out of the sampling position.

8. And (3) continuously repeating the steps 3-7, and automatically completing the dilution operation of the samples in all the sampling test tubes 9.

Claims (5)

1. Sample automatic dilution device, including sampling mechanism and wiper mechanism, its characterized in that:

The cleaning mechanism comprises a cleaning sleeve (6), and a cleaning introducing pipe (7) and a cleaning discharging pipe (8) are communicated with the side part of the cleaning sleeve (6);

The sampling mechanism comprises a sampling arm (1), the sampling arm (1) is driven by a ball screw nut pair driven by a stepping motor I (2) to do lifting motion along a left linear guide pair and a right linear guide pair, a sampling needle (3) which downwards penetrates through a cleaning sleeve (6) and is aligned with a sampling test tube (9) is arranged at the overhanging end of the sampling arm (1), the sampling needle (3) is a double-cavity needle tube, one cavity tube is connected with a sampling tube (4) at the top of the sampling needle (3), and the other cavity tube is connected with a sampling test tube (5);

In a limiting position where the sampling arm (1) descends, the sampling needle (3) stretches into the sampling test tube (9) and the needle point at the lower end of the sampling needle (3) does not touch the bottom of the sampling test tube (9);

In the limit position of the ascending of the sampling arm (1), the sampling needle (3) withdraws from the sampling test tube (9) and the needle tip of the sampling needle (3) is positioned in the cleaning sleeve (6).

2. The automatic sample diluting device according to claim 1, wherein the ball screw nut pair comprises a screw rod (10) and a ball screw nut (11) which are matched with each other, the ball screw nut (11) is arranged in the sampling arm (1), the upper shaft end of the screw rod (10) is connected with a rotating shaft of a stepping motor I (2), and the stepping motor I (2) is arranged at the top of the sampling frame (14).

3. The automatic sample diluting device according to claim 2, wherein each linear guide pair comprises a guide rod (12) and a ball linear bearing (13) which are matched with each other, the left and right ball linear bearings (13) are arranged in the sampling arm (1) at two sides of the ball screw nut (11), and the left and right guide rods (12) are arranged between the top and the bottom of the sampling frame (14).

4. The automatic sample diluting device according to claim 2, wherein upper and lower limiting positions are respectively provided with an upper photoelectric sensor (15) and a lower photoelectric sensor (16) which are arranged on the side parts of the sampling frame (14), and the sampling arm (1) is provided with a photoelectric sensor baffle I (17) which can respectively induce the upper photoelectric sensor (15) and the lower photoelectric sensor (16).

5. The automatic sample diluting device according to any one of claims 1-4, further comprising a turntable mechanism, wherein the plurality of sampling test tubes (9) are circumferentially and uniformly arranged in a turntable (18) of the turntable mechanism, and the turntable (18) is driven by a synchronous pulley transmission pair (20) driven by a stepping motor II (19) to perform rotary motion so as to rotate each sampling test tube (9) to a sampling position.