Sample injector of full-automatic biochemical analyzer

Abstract

The utility model relates to the technical field of sample injectors, in particular to a sample injector of a full-automatic biochemical analyzer. According to the technical scheme, the device comprises a mounting base, a sampling head and a movable rod, the mounting base is of a U-shaped structure, a controller is fixed to the back face of the mounting base, the upper end of the movable rod penetrates through the mounting base, the sampling head is fixed to the upper end of the movable rod, and a sampling pipe is fixed to the outer side of the bottom of the sampling head; limiting grooves are formed in the outer sides of the movable rods, limiting blocks matched with the limiting grooves are arranged on the inner side walls of the belt wheels, and a stepping motor is fixed to the upper end of the back face of the mounting base. According to the automatic sampling device, automatic sample adding of the sampling pipe can be achieved through rotation and up-and-down stretching and retracting of the movable rod, in the rotation process of the movable rod, the specified telescopic block stretches out, accurate positioning is achieved through limiting and blocking of the check block, and position deviation of sampling or sample injection caused by rotation inertia is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sample adders, in particular to a sample adder for a full-automatic biochemical analyzer. Background Art

[0002] The pipettes of biochemical analyzers are usually used to automatically add samples to ensure the accuracy and efficiency of the analysis process. These pipettes usually use precise volume control devices to accurately add a specific volume of sample liquid to the analytical instrument.

[0003] During the driving process of the sampler, the lifting and lowering of the movable rod is used to drive the lifting and lowering of the sampling tube, and the movable rod is rotated at a specified angle to switch the sampling tube between the sample liquid test tube and the detection test tube. In this process, ensuring that the rotation angle of the movable rod is always consistent and accurate is an important guarantee for accurate sample addition. Therefore, in order to avoid position deviation caused by rotational inertia, a limit structure needs to be designed on the rotating structure. Utility Model Content

[0004] The utility model aims to provide a fully automatic biochemical analyzer sample injector in view of the problems existing in the background technology.

[0005] The technical solution of the utility model is as follows: a fully automatic biochemical analyzer sample injector, comprising a mounting base, a sampling head and a movable rod, the mounting base is a U-shaped structure, and a controller is fixed on the back side, the upper end of the movable rod passes through the mounting base, the sampling head is fixed on the upper end of the movable rod, and a sampling tube is fixed on the outer side of the bottom of the sampling head, a pulley is rotatably connected to the mounting base, the movable rod passes through the pulley, a limiting groove is provided on the outer side of the movable rod, and a limiting block matched with the limiting groove is provided on the inner side wall of the pulley, a stepping motor is fixed to the upper end of the back side of the mounting base, a transmission belt is installed between the output end of the stepping motor and the pulley, a lifting block is slidably connected in the mounting base, the movable rod passes through the lifting block and is rotatably connected to the lifting block, and a limiting assembly is arranged between the bottom of the movable rod and the lifting block.

[0006] Preferably, the limiting assembly comprises a disc and a telescopic block, the disc is fixed at the bottom of the movable rod, a stopper is fixed at the periphery of the disc, and the telescopic block is installed at the bottom of the lifting block and distributed circumferentially at the periphery of the disc.

[0007] Preferably, a cylinder is installed in the lifting block and at a position corresponding to the telescopic block.

[0008] Preferably, a driving groove is provided in the mounting base, a threaded sleeve is slidably connected in the driving groove, and the outer side of the threaded sleeve is fixed to the lifting block.

[0009] Preferably, a threaded rod is rotatably connected in the driving groove, the threaded rod passes through the threaded sleeve and is threadedly connected to the threaded sleeve, a servo motor is fixed to the upper end of the driving groove, and the output end of the servo motor is fixed to the upper end of the threaded rod.

[0010] Compared with the prior art, the utility model has the following beneficial technical effects: automatic sampling of the sampling tube can be achieved by rotating and extending the movable rod up and down, and during the rotation of the movable rod, a designated telescopic block is extended, and the limit blocking of the block is utilized to achieve precise positioning, thereby avoiding position deviation in sampling or sample injection caused by rotational inertia. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the front cutaway structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the combined structure of the connection between the pulley and the movable rod of the utility model;

[0013] Figure 3 This is a schematic diagram of the combined structure of the bottom of the lifting block and the disc of the utility model;

[0014] Figure 4 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0015] Figure numerals: 1. Mounting base; 11. Driving groove; 12. Threaded sleeve; 13. Threaded rod; 2. Sampling head; 21. Sampling tube; 3. Movable rod; 31. Limiting groove; 4. Lifting block; 41. Disc; 42. Stop block; 43. Telescopic block; 44. Cylinder; 5. Pulley; 51. Limiting block; 6. Stepping motor; 7. Transmission belt; 8. Controller. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Embodiment 1

[0018] like Figure 1As shown, the utility model proposes a fully automatic biochemical analyzer sample injector, including a mounting base 1, a sampling head 2 and a movable rod 3. The mounting base 1 is a U-shaped structure, and a controller 8 is fixed on the back side. The upper end of the movable rod 3 passes through the mounting base 1, the sampling head 2 is fixed on the upper end of the movable rod 3, and a sampling tube 21 is fixed on the outer side of the bottom of the sampling head 2. A pulley 5 is rotatably connected to the mounting base 1, the movable rod 3 passes through the pulley 5, a limiting groove 31 is provided on the outer side of the movable rod 3, and a limiting block 51 adapted to the limiting groove 31 is provided on the inner side wall of the pulley 5. A stepper motor 6 is fixed to the upper end of the back side of the mounting base 1, a transmission belt 7 is installed between the output end of the stepper motor 6 and the pulley 5, a lifting block 4 is slidably connected in the mounting base 1, the movable rod 3 passes through the lifting block 4 and is rotatably connected to the lifting block 4, and a limiting component is arranged between the bottom of the movable rod 3 and the lifting block 4.

[0019] The limiting assembly includes a disc 41 and a telescopic block 43. The disc 41 is fixed at the bottom of the movable rod 3. A stopper 42 is fixed to the periphery of the disc 41. The telescopic block 43 is installed at the bottom of the lifting block 4 and is distributed around the periphery of the disc 41. A cylinder 44 is installed in the lifting block 4 and at a position corresponding to the telescopic block 43.

[0020] A driving groove 11 is opened in the mounting base 1, and a threaded sleeve 12 is slidably connected in the driving groove 11. The outer side of the threaded sleeve 12 is fixed to the lifting block 4. A threaded rod 13 is rotatably connected in the driving groove 11. The threaded rod 13 passes through the threaded sleeve 12 and is threadedly connected to the threaded sleeve 12. A servo motor is fixed at the upper end of the driving groove 11, and the output end of the servo motor is fixed to the upper end of the threaded rod 13.

[0021] In this embodiment, the entire device is first connected to an external power supply, and the servo motor is used to drive the threaded rod 13 to rotate, thereby driving the threaded sleeve 12 and the lifting block 4 to be lifted and lowered. At the same time, the rotation of the output end of the stepping motor 6 and the transmission of the transmission belt 7 can drive the pulley 5 and the movable rod 3 to rotate, and finally drive the sampling head 2 to rotate and lift. During rotation, the sampling tube 21 can be switched between the sample liquid test tube and the detection test tube. The lifting can be used to inject and extract the sample liquid, thereby achieving the purpose of automatic sampling. At the same time, according to the positions of the sample liquid test tube and the detection test tube, the angle at which the movable rod 3 needs to be deflected is determined. At this time, the cylinder 44 is used to push the two telescopic blocks 43 at the specified position to extend. When the movable rod 3 drives the disc 41 to rotate synchronously, the rotation of the disc 41 is restricted by the block 42, so that the block 42 can only deflect between the two extended telescopic blocks 43. Therefore, the rotation angle of the movable rod 3 is positioned, and the position deviation caused by rotation inertia is avoided, thereby improving the accuracy of sampling.

[0022] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A fully automatic biochemical analyzer sample injector, comprising a mounting base (1), a sampling head (2) and a movable rod (3), characterized in that: The mounting base (1) is a U-shaped structure, and a controller (8) is fixed on the back side. The upper end of the movable rod (3) passes through the mounting base (1), the sampling head (2) is fixed to the upper end of the movable rod (3), and a sampling tube (21) is fixed to the outer side of the bottom of the sampling head (2). A pulley (5) is rotatably connected to the mounting base (1), the movable rod (3) passes through the pulley (5), and a limiting groove (31) is provided on the outer side of the movable rod (3). The inner wall is provided with a limit block (51) adapted to the limit groove (31); a stepper motor (6) is fixed to the upper end of the back side of the mounting base (1); a transmission belt (7) is installed between the output end of the stepper motor (6) and the pulley (5); a lifting block (4) is slidably connected inside the mounting base (1); the movable rod (3) passes through the lifting block (4) and is rotatably connected to the lifting block (4); and a limit assembly is arranged between the bottom of the movable rod (3) and the lifting block (4).

2. A fully automatic biochemical analyzer sample injector according to claim 1, characterized in that: The limiting assembly comprises a disc (41) and a telescopic block (43); the disc (41) is fixed at the bottom of the movable rod (3); a stopper (42) is fixed to the periphery of the disc (41); and the telescopic block (43) is installed at the bottom of the lifting block (4) and is distributed circumferentially around the disc (41).

3. A fully automatic biochemical analyzer sample injector according to claim 2, characterized in that: A cylinder (44) is installed in the lifting block (4) at a position corresponding to the telescopic block (43).

4. A fully automatic biochemical analyzer sample injector according to claim 1, characterized in that: A driving groove (11) is provided in the installation base (1), a threaded sleeve (12) is slidably connected in the driving groove (11), and the outer side of the threaded sleeve (12) is fixed to the lifting block (4).

5. A fully automatic biochemical analyzer sample injector according to claim 4, characterized in that: A threaded rod (13) is rotatably connected in the driving groove (11), the threaded rod (13) passes through the threaded sleeve (12) and is threadedly connected to the threaded sleeve (12), a servo motor is fixed to the upper end of the driving groove (11), and the output end of the servo motor is fixed to the upper end of the threaded rod (13).

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