Sample adding device for chemical analyzer

Abstract

The utility model relates to the technical field of medical instruments, and discloses a sample adding device for a chemical analyzer, which comprises an injection unit and a movable sampling unit arranged on the side of the injection unit, the injection unit comprises a mounting rack, a cleaning assembly arranged on the mounting rack, a driving module and an injector, a piston rod of an inner cavity of the injector is connected to the output end of the driving module, the movable sampling unit comprises a fixing frame, an up-down moving module arranged in the fixing frame and a sample adding needle, and the sample adding needle is connected to the output end of the up-down moving module through a limiting frame. The up-down moving module drives the sample adding needle to move up and down, one side of the injector is connected with the sample adding needle through a connecting pipeline to realize suction of liquid, and the other side of the injector is connected with the cleaning assembly to realize cleaning.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a sample adding device for a chemical analyzer. Background Art

[0002] Biochemical analyzer, also often called biochemical analyzer, is an instrument that uses the principle of photoelectric colorimetry to measure a specific chemical component in body fluids. It is now widely used in hospitals at all levels due to its fast measurement speed, high accuracy and small reagent consumption. Automatic biochemical analyzer is an instrument that imitates manual operation to complete some or all of the steps of biochemical analysis, such as sampling, adding reagents, removing interferences, mixing, keeping warm, colorimetry, calculating results, printing reports and cleaning.

[0003] The sample loading device is one of the main components in the existing chemical analyzer. It is used to drive the sample loading needle to complete the reagent adding process and has the function of lifting and lowering relative to the plane and optional installation. The sample loading needle is mainly responsible for penetrating into the vessel to perform the sample loading action. Since chemical analysis requires precise control of the sample loading action, higher requirements are placed on the performance of reagent loading. The sample loading module and the injection module in the existing sample loading device are installed separately in the instrument, resulting in a long connecting pipe between the syringe and the sample loading needle, especially when the accuracy is not high when micro-sampling. In view of this, the technicians in this field have designed a sample loading device for chemical analyzers. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a sample adding device for a chemical analyzer with high sampling accuracy, which is convenient for realizing micro-sampling of reagents.

[0005] The technical solution of the utility model is: a sample adding device for a chemical analyzer, comprising an injection unit and a mobile sampling unit arranged on the side of the injection unit, the injection unit comprising a mounting frame, a cleaning component arranged on the mounting frame, a driving module and a syringe, the piston rod of the inner cavity of the syringe is connected to the output end of the driving module, the mobile sampling unit comprises a fixed frame, an up and down moving module arranged in the fixed frame and a sample adding needle, the sample adding needle is connected to the output end of the up and down moving module through a limiting frame, the up and down moving module drives the sample adding needle to move up and down, one side of the syringe is connected to the sample adding needle through a connecting pipe to realize liquid suction, and the other side is connected to the cleaning component to realize cleaning.

[0006] It can be seen from the above scheme that the injection suction unit drives the piston rod in the syringe to move up and down through the driving module to complete the suction action, thereby realizing the suction or discharge of quantitative chemical reagents, the cleaning component is used to clean the pipeline, connecting pipeline and sample addition needle in the syringe, the limit frame is used to drive the sample addition needle to move up and down, and the mobile sampling unit realizes the up and down movement of the sample addition needle in the fixed frame through the up and down moving module, thereby realizing the up and down movement of the sample addition needle. The utility model reduces the length of the precision sampling liquid pipeline by combining the injection suction unit and the mobile sampling unit, improves the accuracy of precision sampling, ensures precision, and has good stability, and the life of the sample addition device is longer.

[0007] The driving module includes a servo motor, a first gear, a first rack meshing with the first gear, a first slide rail, and a first slider slidingly matched on the first slide rail, the first gear is connected to the output end of the servo motor, the first slide rail is connected to the inner wall of the mounting frame, the first slider is fixedly connected to the first rack through a mounting block, and the bottom end of the mounting block is connected to the piston rod through a connecting block. It can be seen that the servo motor is used to drive the first gear to rotate, and the first rack meshes with the first gear to drive the piston rod to move up and down in the syringe to realize the suction action of the sample addition for the reagent, and realize the injection and sampling of the reagent, and the first slider slides up and down on the first slide rail to realize the guidance of the piston rod to move up and down.

[0008] The up-and-down moving module includes a driving motor, a second gear, a second rack meshing with the second gear, a second slide rail, and a second slider slidably fitted on the second slide rail, the second gear is connected to the output end of the driving motor, the second rack and the second slide rail are vertically and parallelly fixedly connected to the inner wall of the fixed frame, the limiting frame is fixedly connected to the second slider, and the driving motor is fixedly connected to the side of the limiting frame. It can be seen that the second rack is fixed by the fixed frame, the driving motor drives the second gear to mesh with the second rack to drive the limiting frame to move up and down in the fixed frame, and the second slider slidably fits with the second slide rail to guide the sample needle to move up and down.

[0009] The front side of the limiting frame is provided with a receiving groove, and the end of the connecting pipe passes through the receiving groove to communicate with the sample needle. The other side of the limiting frame is integrally formed with a fixing block, and the fixing block is provided with a through groove adapted to the sample needle from top to bottom. It can be seen that the sample needle is limited on the fixing block through the through groove, and the receiving groove is used to store the connecting pipe, so that when the sample needle moves downward, the connecting pipe extends downward.

[0010] A movable slide is vertically arranged on the side wall of the fixing frame, and the fixing block extends out of the movable slide. It can be seen that the movable slide is adapted to the fixing block, and the movable slide is used for the sample adding needle to extend out of the fixing frame to realize up and down movement.

[0011] The cleaning assembly includes a solenoid valve and a cleaning pipe, one end of the cleaning pipe is connected to the solenoid valve, and the other end is connected to the pipeline in the syringe, and the solenoid valve is arranged in the mounting cavity of the mounting frame. It can be seen that the solenoid valve is used to pump water into the pipeline of the syringe for cleaning, and the cleaning pipe is used to pump water. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a partial structural schematic diagram of the utility model;

[0014] Figure 3 It is a structural schematic diagram of the utility model from another perspective;

[0015] Figure 4 It is an exploded view of the utility model;

[0016] Figure 5 It is a structural schematic diagram of the injection suction unit of the utility model;

[0017] Figure 6 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] like Figures 1 to 6 As shown, the utility model is a sample adding device for a chemical analyzer, comprising an injection unit and a mobile sampling unit arranged on the side of the injection unit, wherein the injection unit comprises a mounting frame 1, a cleaning assembly 2 arranged on the mounting frame 1, a driving module 3 and a syringe 4, wherein a piston rod 42 in the inner cavity of the syringe 4 is connected to the output end of the driving module 3, the mobile sampling unit comprises a fixed frame 5, an up-and-down moving module 7 arranged in the fixed frame 5 and a sample adding needle 8, wherein the sample adding needle 8 is connected to the output end of the up-and-down moving module 7 through a limiting frame 6, and the up-and-down moving module 7 drives the sample adding needle 8 to move up and down, and one side of the syringe 4 is connected to the sample adding needle 8 through a connecting pipe 9 to realize liquid suction, and the other side is connected to the cleaning assembly 2 to realize cleaning. In this embodiment, the length of the connecting pipe 9 is 0.2m.

[0020] The driving module 3 includes a servo motor 31, a first gear 32, a first rack 33 meshing with the first gear 32, a first slide rail 34, and a first slider 35 slidably fitted on the first slide rail 34. The first gear 32 is connected to the output end of the servo motor 31, the first slide rail 34 is connected to the inner wall of the mounting frame 1, the first slider 35 is fixedly connected to the first rack 33 through a mounting block 36, and the bottom end of the mounting block 36 is connected to the piston rod 42 through a connecting block 37. In this embodiment, the servo motor 31 is connected to the rear side plate of the mounting frame 1, the syringe 4 is connected to the front side plate of the mounting frame 1, and the first gear 32, the first rack 33, the first slide rail 34, the first slider 35 and the solenoid valve 21 are all arranged between the front and rear side plates.

[0021] The up and down moving module 7 includes a driving motor 71, a second gear 72, a second rack 73 meshing with the second gear 72, a second slide rail 74 and a second slider 75 slidingly fitted on the second slide rail 74, the second gear 72 is connected to the output end of the driving motor 71, the second rack 73 and the second slide rail 74 are vertically and parallelly fixedly connected to the inner wall of the fixed frame 5, the limiting frame 6 is fixedly connected to the second slider 75, and the driving motor 71 is fixedly connected to the side of the limiting frame 6.

[0022] The front side of the limiting frame 6 is provided with a receiving groove 63, and the end of the connecting pipe 9 passes through the receiving groove 63 to communicate with the sample needle 8. The other side of the limiting frame 6 is integrally formed with a fixing block 64, and the fixing block 64 is provided with a through hole 641 adapted to the sample needle 8 from top to bottom. A moving slide 51 is vertically provided on the side wall of the fixing frame 5, and the fixing block 64 extends out of the moving slide 51. In this embodiment, the connecting pipe 9 is a silicone hose with a relatively soft material, and the connecting pipe 9 is arranged in an annular shape in the receiving groove 63. When the sampling needle 8 moves down, the connecting pipe 9 moves down accordingly. When the sampling needle 8 moves up, the connecting pipe 9 is stored in the receiving groove 63 in an annular winding manner.

[0023] The cleaning assembly 2 includes a solenoid valve 21 and a cleaning pipe 22. One end of the cleaning pipe 22 is connected to the solenoid valve 21, and the other end is connected to the pipe 41 in the syringe 4. The solenoid valve 21 is arranged in the installation cavity 11 of the mounting frame 1. In this embodiment, the mounting frame 1 is provided with a mounting cavity 11 with openings on both sides. The solenoid valve 21 is arranged in the installation cavity 11. The first gear 32, the first rack 33, the first slide rail 34 and the first slider 35 are all arranged in the installation cavity 11. The two sides of the syringe 4 are respectively provided with a liquid outlet pipe and a water inlet pipe. The liquid inlet pipe and the water inlet pipe are respectively connected to the syringe 4. The output end of the solenoid valve 21 is connected to a cleaning water source. One end of the cleaning pipe 22 is connected to the liquid inlet pipe, and the other end passes through the front side plate of the mounting frame 1 and is connected to the output end of the solenoid valve 21. The cleaning pipe 22 is a silicone hose.

[0024] The working process of the utility model is as follows: the mounting frame 1 is fixedly connected to the chemical analyzer, and when the sample adding needle performs the suction injection operation, the solenoid valve 21 is in a closed state, and the driving motor 71 drives the second gear 72 to rotate. The driving motor 71 drives the sample adding needle 8 on the limit frame 6 to extend downward and extend into the reagent bottle to absorb the reagent through the meshing transmission of the second gear 72 and the second rack 73, and the servo motor 31 rotates, and drives the piston rod 42 to move downward in the pipe of the syringe 4 through the meshing transmission of the first gear 32 and the first rack 33, and the end of the sample adding needle 8 is driven. The reagent is sucked in through the connecting pipe 9, and the reagent is sucked into the syringe body 1 to complete the reagent absorption. After the reagent is absorbed, the driving module 7 drives the sample injection needle 8 to move up and withdraws from the absorbed reagent tube. The servo motor 31 drives the first gear 32 to rotate, and the first slider 35 is driven to slide on the slide rail 34 through the meshing transmission between the first gear 32 and the first rack 33, so that the piston rod 42 drives the piston to move up in the syringe 4, and the reagent in the syringe 4 is output from the end of the sample injection needle 8 through the connecting pipe 9, thereby realizing quantitative reagent injection.

[0025] When the syringe 4 cleans the pipe 41 in the syringe 4, the solenoid valve 21 is opened, and the pressurized water flows through the solenoid valve 21 from the cleaning pipe 22 into the pipe 41 of the syringe 4 to achieve cleaning. The servo motor 31 drives the piston rod 42 to move upward to discharge the cleaning liquid from the inner wall of the sample adding needle 8, thereby playing the role of cleaning the pipe 41, facilitating the cleaning of the pipe 41 of the syringe after the reagent is injected, and avoiding cross contamination between reagents. The utility model reduces the length of the precision sampling liquid pipeline by combining the injection suction unit and the mobile sampling unit, improves the accuracy of precision sampling (minimum 1uL), ensures precision, and has good stability, and the life of the sample adding device is longer.

[0026] Finally, it should be emphasized that the above is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sample adding device for a chemical analyzer, comprising an injection unit and a mobile sampling unit arranged on the side of the injection unit, characterized in that: The injection unit comprises a mounting frame (1), a cleaning component (2) arranged on the mounting frame (1), a driving module (3) and a syringe (4); a piston rod (42) in the inner cavity of the syringe (4) is connected to the output end of the driving module (3); the mobile sampling unit comprises a fixed frame (5), an up-and-down moving module (7) arranged in the fixed frame (5) and a sample adding needle (8); the sample adding needle (8) is connected to the output end of the up-and-down moving module (7) through a limiting frame (6); the up-and-down moving module (7) drives the sample adding needle (8) to move up and down; one side of the syringe (4) is connected to the sample adding needle (8) through a connecting pipe (9) to realize liquid suction, and the other side is connected to the cleaning component (2) to realize cleaning.

2. A sample adding device for a chemical analyzer according to claim 1, characterized in that: The driving module (3) comprises a servo motor (31), a first gear (32), a first rack (33) meshing with the first gear (32), a first slide rail (34), and a first slider (35) slidably fitted on the first slide rail (34), the first gear (32) being connected to the output end of the servo motor (31), the first slide rail (34) being connected to the inner wall of the mounting frame (1), the first slider (35) being fixedly connected to the first rack (33) via a mounting block (36), and the bottom end of the mounting block (36) being fixedly connected to the piston rod (42).

3. A sample adding device for a chemical analyzer according to claim 1, characterized in that: The up-and-down moving module (7) comprises a driving motor (71), a second gear (72), a second rack (73) meshing with the second gear (72), a second slide rail (74), and a second slider (75) slidably fitted on the second slide rail (74); the second gear (72) is connected to the output end of the driving motor (71); the second rack (73) and the second slide rail (74) are vertically and parallelly fixedly connected to the inner wall of the fixing frame (5); the limiting frame (6) is fixedly connected to the second slider (75); and the driving motor (71) is fixedly connected to the side of the limiting frame (6).

4. A sample adding device for a chemical analyzer according to claim 3, characterized in that: The limiting frame (6) is connected to the side of the fixing frame (5); a receiving groove (63) is provided on the front side of the limiting frame (6); the end of the connecting pipe (9) passes through the receiving groove (63) and is connected to the sample addition needle (8); one side of the limiting frame (6) is fixedly connected to the driving motor (71); the other side is integrally formed with a fixing block (64); the fixing block (64) is penetrated by a through hole (641) adapted to the sample addition needle (8) from top to bottom.

5. A sample adding device for a chemical analyzer according to claim 4, characterized in that: A movable slide groove (51) is vertically arranged on the side wall of the fixed frame (5), and the fixed block (64) extends out of the movable slide groove (51).

6. A sample adding device for a chemical analyzer according to claim 1, characterized in that: The cleaning assembly (2) comprises a solenoid valve (21) and a cleaning pipe (22); one end of the cleaning pipe (22) is connected to the solenoid valve (21), and the other end is connected to a pipeline (41) in the syringe (4); the solenoid valve (21) is arranged in the installation cavity (11) of the installation frame (1).

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