Sampling and pipetting device

Abstract

The utility model belongs to the technical field of liquid sampling devices, and particularly provides a sampling and pipetting device. The sampling and pipetting device comprises a rack, a lifting mechanism and a bracket are arranged on the rack, a pipettor is installed at the output end of the lifting mechanism, a cleaning structure and at least two liquid storage barrel placing positions used for placing liquid storage barrels are arranged on the bracket, the cleaning structure is provided with a containing cavity used for containing sewage generated by cleaning the pipettor, and an opening is formed in the top end of the containing cavity. And at least one of the bracket and the lifting mechanism can move relative to the rack, so that the pipettor can be provided with corresponding positions which are respectively positioned right above the liquid storage barrel placing positions and the cleaning structure. After sampling of one kind of liquid is completed, the pipettor is located over the cleaning structure, at the moment, a suction head of the pipettor can be directly washed, the pipettor does not need to be disassembled, sewage can flow into the containing cavity, next-time liquid sampling is conducted after cleaning is completed, and operation is convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of liquid sampling devices, and in particular relates to a sampling and pipetting device. Background Technology

[0002] When preparing solutions (such as acid solutions used in oil well acidizing), it is necessary to measure out different chemical agents and add them to the corresponding preparation containers. This process requires the use of a liquid dispenser, or liquid dispensing gun. Currently, in actual laboratory solution preparation, the main method is still to manually use a handheld liquid dispenser to draw out the corresponding chemical agents and add them to the preparation container. This method is labor-intensive.

[0003] Analysis of the data revealed that utility model patent CN219434425U discloses a laboratory liquid sampling and mixing device. This device includes a base and a subbase. A rotatable dispensing mechanism is mounted on the subbase. The dispensing mechanism includes a fixed base with connecting plates on its four sides. A mounting box is mounted on the connecting plates, and a vertically movable pipette is installed inside the mounting box. The mounting box also contains a cylinder that pushes the liquid in the pipette outwards. The base has evenly distributed injection tubes. After the pipette rotates to the corresponding injection tube position, it automatically descends into the injection tube, achieving automatic liquid dispensing.

[0004] The aforementioned patent discloses a scheme that uses a lifting mechanism to automatically raise and lower the pipette to dispense liquid into the injector, while also allowing the pipette to move between different injector tubes to switch between them. However, the patent does not disclose the sampling process of the pipette. In reality, during sampling, liquid residue inevitably remains on the outer wall of the pipette tip. When drawing liquid from another reservoir, the tip must be inserted below the liquid surface inside the reservoir, and this residue can contaminate the liquid inside. Therefore, in practice, the pipette needs to be cleaned after each sampling. The aforementioned patent requires the pipette to be disassembled, cleaned separately, and then reinstalled, which is cumbersome. Utility Model Content

[0005] The purpose of this invention is to provide a sampling and pipetting device to solve the technical problems of high manual labor intensity and inconvenience in cleaning during the sampling and pipetting process in the prior art.

[0006] To achieve the above objectives, the technical solution of the sampling and pipetting device provided by this utility model is as follows:

[0007] A sampling pipetting device comprises a frame, a lifting mechanism and a bracket provided on the frame, a pipette is installed on the output end of the lifting mechanism, the bracket is provided with a cleaning structure and at least two liquid storage bucket placing positions for placing liquid storage buckets, the cleaning structure has a containing cavity for containing sewage generated by cleaning the pipette, the containing cavity has an opening at the top end, and at least one of the bracket and the lifting mechanism is movable relative to the frame so that the pipette can have a corresponding position located directly above each liquid storage bucket placing position and the cleaning structure.

[0008] As a further improvement, the frame is provided with a mounting seat, the bracket is mounted on the mounting seat through a rotating shaft extending vertically along an axis, and the rotating shaft is a hollow shaft, the internal cavity of the rotating shaft constitutes the containing cavity, and each liquid storage bucket placing position is arranged in a circumferential direction of the rotating shaft.

[0009] As a further improvement, the mounting seat is provided with an annular groove with an upward opening, the bracket is provided with a sliding block at the bottom thereof and sliding along the annular groove, and the annular groove is coaxially arranged with the rotating shaft; or the bracket is provided with an annular groove with a downward opening at the bottom thereof, the mounting seat is provided with a sliding block sliding along the annular groove, and the annular groove is coaxially arranged with the rotating shaft.

[0010] As a further improvement, the sliding block is provided with at least two sliding blocks arranged at different positions in the circumferential direction of the rotating shaft.

[0011] As a further improvement, the mounting seat is a movable seat guided to move along the frame.

[0012] As a further improvement, the lifting mechanism is fixed to the frame, and the position of the rotating shaft satisfies that the rotating shaft is located directly below the pipette in the moving path of the movable seat.

[0013] As a further improvement, the bracket comprises a circumferentially closed annular closed structure for enclosing the liquid storage buckets placed on the liquid storage bucket placing positions in the bracket.

[0014] As a further improvement, the containing cavity is provided with a cleaning brush inside.

[0015] As a further improvement, the containing cavity is communicated with a sewage discharge pipe.

[0016] As a further improvement, the pipette is a vacuum pipette, which has a liquid suction cavity and a suction pipe joint communicated with the liquid suction cavity, and is further provided with a flushing pipe joint communicated with the liquid suction cavity to flush the interior of the pipette through the flushing pipe joint connected with a water pipe.

[0017] The utility model belongs to the pioneering invention and creation, and its beneficial effect is: when the sampling pipette device in the utility model is used to take the liquid in different liquid storage barrels, the liquid storage barrels can be placed in the corresponding liquid storage barrel placing positions according to the need, under the action of the lifting mechanism, the pipette moves up and down to insert the liquid storage barrel to take sample and remove the liquid storage barrel, and the pipette does not need to be manually supported in this process, thereby reducing the labor intensity. Meanwhile, the pipette and the bracket can move relatively, so that the same pipette can be used to take the liquid in different liquid storage barrels. After the sampling of one kind of liquid is completed, the pipette is located directly above the cleaning structure, at this time, the pipette tip can be directly flushed, without the need of disassembling the pipette, the sewage can flow into the containing cavity, and the sampling of the next liquid is carried out after the cleaning is completed, so that the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the front view (partially sectioned) of the sampling pipette device embodiment in the utility model;

[0019] Figure 2 It is the side view (partially sectioned) of the sampling pipette device embodiment in the utility model;

[0020] Figure 3 It is the top view (partially sectioned) of the sampling pipette device embodiment in the utility model.

[0021] EXPLANATION OF REFERENCE NUMERALS:

[0022] 1, rack; 2, bracket; 3, rotating shaft; 4, pipette; 501, air cylinder; 502, truss; 6, moving seat; 7, bearing; 8, liquid storage barrel; 101, guide groove; 201, sliding block; 301, blow-off pipe; 401, suction head; 402, suction pipe joint; 403, flushing pipe joint; 601, guide block; 602, annular groove. DETAILED DESCRIPTION

[0023] In order to reduce the labor intensity of the liquid preparation staff, and avoid the cross contamination of the liquids in different liquid storage barrels, the basic technical concept of the utility model is that the pipette can automatically take liquid in different liquid storage barrels, and a cleaning structure capable of collecting and cleaning sewage is added, the pipette tip is flushed after the pipette completes the liquid taking once, and the sewage can enter the cleaning structure, without the need of disassembling the pipette, so that the operation is convenient and efficient. The utility model will be described in further detail in combination with the embodiments.

[0024] The specific embodiment of the sampling pipette device provided by the utility model is as follows:

[0025] As a most basic implementation mode, as shown in the figure, Figures 1-3As shown, the sampling pipetting device comprises a rack 1, which serves as the basis for installing other structures and has a certain stable bearing capacity. The rack 1 is provided with a lifting mechanism, and the output end of the lifting mechanism is provided with a pipettor 4. Under the action of the lifting mechanism, the pipettor 4 moves downward to be inserted into the corresponding liquid storage barrel 8, and after completing the liquid absorption, the pipettor 4 moves upward to be removed from the liquid storage barrel 8. Specifically, taking Figure 1 for example, the lifting mechanism comprises a truss 502 installed on the rack 1, and a telescopic driver capable of outputting linear motion is installed on the truss 502. The telescopic driver can be a pneumatic cylinder 501. In order to avoid the truss 502 affecting the upward and downward movement of the pipettor 4, a passage for the pipettor 4 (at least the suction head 401) to pass through is arranged at a position corresponding to the lower part of the pipettor 4 on the truss 502. It should be noted that there are many ways to configure the lifting mechanism. For example, in other embodiments, the lifting mechanism can also be a gear and rack mechanism. Specifically, a vertically extending rack can be installed on the rack 1, and a driving motor connected with a pinion is arranged on the power output shaft matched with the rack. The driving motor can be driven to move up and down along the rack through the meshing transmission of the pinion and the rack. The pipettor 4 is fixed relative to the driving motor, so that the pipettor 4 can be driven to move up and down.

[0026] The bracket 2 is provided with a liquid storage barrel placing position, which can place a corresponding liquid storage barrel storing a corresponding chemical agent. In order to take different liquids at one time, the liquid storage barrel placing position on the bracket 2 is provided with two or more, and each liquid storage barrel placing position can place one liquid storage barrel 8. The specific number of liquid storage barrel placing positions can be determined according to actual needs. The example shown in the figure is that four liquid storage barrels 8 are placed on the bracket 2.

[0027] In order to clean the pipettor 4 without disassembling it, the bracket 2 is also provided with a cleaning structure. Most basically, the cleaning structure needs to be able to accommodate a certain amount of sewage generated when the suction head 401 of the pipettor 4 is washed, that is, the cleaning structure has an accommodation cavity for accommodating the sewage generated when the pipettor 4 is cleaned, and the top end of the accommodation cavity has an opening.

[0028] If the same pipettor 4 can correspond to different positions of the liquid storage barrel 8 and the position of the cleaning structure, the positions of the bracket 2 and the lifting mechanism cannot be fixed, and at least one of them should be movable relative to the rack 1, so that the pipettor 4 can have corresponding positions located above each liquid storage barrel placing position and the cleaning structure.

[0029] The analysis shows that in the above basic embodiment, when the pipette 4 completes the liquid taking in the liquid storage barrel 8, the bracket 2 and / or the lifting mechanism are moved, so that the pipette 4 is located directly above the cleaning structure, and then the user washes the suction head 401 with water, and the generated sewage enters the cleaning structure, thereby completing the cleaning of the pipette 4 without disassembling the pipette 4.

[0030] On the basis of the above basic embodiment, as a preferred embodiment, the rack 1 is provided with a movable moving seat 6, and the bracket 2 is installed on the moving seat 6, that is, the moving seat 6 constitutes a movable mounting seat capable of mounting the bracket 2. Specifically, the moving direction of the moving seat 6 is the left-right direction in the figure, and the rack 1 is provided with two guide grooves 101, the grooves of the two guide grooves 101 are opposite, and the two sides of the moving seat 6 are provided with guide blocks 601, the guide blocks 601 slide along the guide grooves 101, thereby realizing the guide cooperation. This guide block 601 and guide groove 101 guide cooperation mode is more stable and reliable, but it should be noted that in other embodiments, other guide cooperation modes such as sliding block 201 guide rail, guide wheel guide rail, linear bearing 7 cooperation optical axis, etc. are also not excluded. Figure 2

[0031] As shown in Figures 1-3 , the bracket 2 is installed on the moving seat 6 through the rotating shaft 3 extending vertically along the rotating axis, and the rotating shaft 3 is a hollow shaft, and the cavity in the rotating shaft 3 constitutes the accommodation cavity, and each liquid storage barrel placing position is arranged circumferentially along the rotating shaft 3. Of course, in order to realize the rotation of the rotating shaft 3, a suitable bearing 7 also needs to be selected. In this way, in the case of arranging more liquid storage barrels 8, the bracket 2 can be rotated, so that the liquid storage barrels 8 at different positions are rotated to the corresponding positions, and the position adjustment of the liquid storage barrels 8 is more flexible. At the same time, the rotating shaft 3 itself constitutes the cleaning structure, which expands the function of the rotating shaft 3, and further eliminates the need to set up a separate cleaning barrel for collecting sewage.

[0032] It should be noted that in order to facilitate understanding, the above explains how the bracket 2 realizes rotation and how the cleaning structure is arranged in combination with the mounting seat for installing the bracket 2 in the form of the moving seat 6, but in other embodiments, the mounting seat can also be a mounting seat fixed on the rack 1, and at this time the bracket 2 can still be installed on the mounting seat through the same rotating shaft 3.

[0033] Whether the mounting seat is a fixed mounting seat or a moving seat 6, in order to improve the carrying capacity of the bracket 2, in a further preferred embodiment, a guide and support structure is further provided between the bracket 2 and the mounting seat. Taking the mounting seat as the moving seat 6 as an example, as shown in Figure 1 and Figure 2 ​As shown, the mobile seat 6 is provided with an annular groove 602, the groove opening of the annular groove 602 faces upward, the bracket 2 is provided with a sliding block 201, the sliding block 201 is slidingly fitted along the annular groove 602, the axis of the annular groove 602 and the axis of the rotating shaft 3 are coaxial. In this way, the sliding block 201 can not only limit the rotating direction of the bracket 2, but also support the bracket 2. Of course, those skilled in the art can understand that the positions of the annular groove 602 and the sliding block 201 can be interchanged, that is, the annular groove 602 can be installed at the bottom of the bracket 2, at this time the groove opening of the annular groove 602 faces downward, and the sliding block 201 can be installed on the mobile seat 6, which can play the same role.

[0034] In order to play a better supporting role, the sliding block 201 can be provided with two or more, and of course different sliding blocks 201 should be respectively arranged at different positions in the circumferential direction of the rotating shaft 3, so as to support the bracket 2 at different positions.

[0035] On the basis that the mounting seat is the mobile seat 6, at this time the bracket 2 can be moved relative to the pipette 4 through the movement of the mobile seat 6, at this time in order to simplify the structure, the lifting mechanism can be directly fixed on the rack 1. But at this time the position of the rotating shaft 3 meets the condition that the rotating shaft 3 is located directly below the pipette 4 in the movement path of the mobile seat 6, as shown in Figure 1 and Figure 3 to ensure that the generated sewage can enter the containing cavity inside the rotating shaft 3.

[0036] Of course, on the basis that the mounting seat is the mobile seat 6, the lifting mechanism can also be moved relative to the rack 1 through a movable related structure.

[0037] Since the bracket 2 can rotate, part of the top of the liquid storage barrel 8 has a larger opening, and is made of glass material, in order to avoid the liquid storage barrel 8 being thrown out of the bracket 2, in addition to being able to support the bottom structure of the liquid storage barrel 8, the bracket 2 also includes a circumferentially closed annular closed structure, as shown in Figure 3 which can be a complete barrel-shaped structure, so that the annular closed structure can play a role in enclosing the liquid storage barrel 8. Of course, in other embodiments, the above-mentioned annular closed structure can also be a frame structure.

[0038] As shown in Figures 1-3 , a driving device such as a driving motor can not be configured for the rotation of the bracket 2, and manual pushing of the bracket 2 can rotate during work. In this way, the height of the annular closed structure can be appropriately increased so that the annular closed structure is higher than the height of the liquid storage barrel 8 placed in the corresponding liquid storage barrel placing position, at this time when manually pushing the bracket 2 to rotate, direct contact with the liquid storage barrel 8 can be avoided.

[0039] Whether the cleaning structure is a separate sewage collecting barrel or is formed by the rotating shaft 3, in order to achieve a better cleaning effect, a cleaning brush, such as a hairbrush, can be installed on the inner wall of the containing cavity. At this time, under the driving of the lifting mechanism, the suction head 401 can be inserted into the containing cavity, and the cleaning brush brushes the outer wall of the suction head 401. In addition, in order to facilitate drainage, a sewage pipe 301 communicating with the containing cavity can be connected to the cleaning structure.

[0040] The pipette 4 can be a vacuum type pipette 4 in the prior art. Figure 1 As shown, the pipette 4 has a liquid suction cavity and a suction pipe joint 402 communicating with the liquid suction cavity, through which a suction pipe is connected. After a negative pressure is formed in the liquid suction cavity, the liquid in the liquid storage barrel 8 can enter through the suction head 401. Quantitative suction can be achieved by controlling the suction pipe. The specific principle is not described here as it is in the prior art. The pipette 4 is also provided with a flushing pipe joint 403, which also communicates with the liquid suction cavity. After completing a sampling, the valve of the suction pipe is closed, and a water pipe is connected through the flushing pipe joint 403. The water pipe directly flushes the inside of the pipette 4, achieving simultaneous cleaning inside and outside, and the generated sewage can also flow into the cleaning structure.

[0041] Of course, in other embodiments, the pipette can also be a pressing type pipette with a piston in the prior art, which does not affect the cleaning of the outer wall of the suction head.

[0042] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative labor, or make equivalent substitutions for some technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sampling pipetting device, characterized in that, The rack is provided with a lifting mechanism and a bracket, the output end of the lifting mechanism is provided with a pipette, the bracket is provided with a cleaning structure and at least two liquid storage barrel placing positions for placing liquid storage barrels, the cleaning structure has a containing cavity for containing sewage generated by cleaning the pipette, the containing cavity is provided with an opening at the top end, and at least one of the bracket and the lifting mechanism is movable relative to the rack, so that the pipette can have a corresponding position above each liquid storage barrel placing position and the cleaning structure respectively.

2. The sampling pipetting device of claim 1, wherein, The bracket is installed on the mounting seat through a rotating shaft extending vertically along the axis, and the rotating shaft is a hollow shaft, and the internal cavity of the rotating shaft constitutes the containing cavity, and each liquid storage barrel placing position is arranged circumferentially along the rotating shaft.

3. The sampling pipetting device of claim 2, wherein, The mounting seat is provided with an annular groove with an upward notch, and the bracket is provided with a sliding block sliding along the annular groove, and the annular groove is coaxially arranged with the rotating shaft; or the bracket is provided with an annular groove with a downward notch, and the mounting seat is provided with a sliding block sliding along the annular groove, and the annular groove is coaxially arranged with the rotating shaft.

4. The sampling pipetting device of claim 3, wherein, The sliding block is provided with at least two sliding blocks arranged at different positions circumferentially along the rotating shaft.

5. A sampling pipetting device according to any one of claims 2-4, characterized in that The mounting seat is a movable seat that can move along the rack.

6. The sampling pipetting device of claim 5, wherein, The lifting mechanism is fixed on the rack, and the position of the rotating shaft satisfies that the rotating shaft is located directly below the pipette in the moving path of the movable seat.

7. A sampling pipetting device according to any one of claims 2-4, characterized in that The bracket comprises a circumferentially closed annular closed structure for enclosing the liquid storage barrels placed on the liquid storage barrel placing positions in the bracket.

8. The sampling pipetting device according to any one of claims 1-4, characterized in that, The containing cavity is provided with a cleaning brush inside.

9. The sampling pipetting device according to any one of claims 1-4, characterized in that, The containing cavity is communicated with a sewage discharge pipe.

10. The sampling pipetting device according to any one of claims 1-4, characterized in that, The pipette is a vacuum pipette, which has a liquid suction cavity and a suction pipe joint communicated with the liquid suction cavity, and is further provided with a flushing pipe joint communicated with the liquid suction cavity, so as to flush the interior of the pipette through the flushing pipe joint connected with a water pipe.

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