A sample loading arm device and portable automatic biochemical analyzer

Abstract

The utility model discloses a kind of sample loading arm devices, comprising: spline shaft sleeve and lifting motor, lifting motor is used to drive gear and gear connects rocker arm connecting rod, then the rotation movement of rocker arm connecting rod drives slider up and down movement;Sliding block, with spline shaft cooperation, sliding block moves along the axial movement of guide rod when rocker arm rotates;Needle holder, needle holder is provided with sample adding needle and the connecting rod of cylindrical configuration, connecting rod is sleeved in spline shaft outer periphery and its end portion is fixedly connected with sliding block;Rotating mechanism is transmission connection with needle holder to drive sample adding needle to execute rotating action.The utility model discloses the sample loading arm device of the present application sets up simultaneously by gear transmission of lifting motor, and rotating is driven screw gear by lifting motor to drive sample adding needle to carry out lifting action, compared with belt drive drive is more accurate.The utility model further discloses a kind of portable automatic biochemical instrument comprising the above-mentioned sample loading arm device.

Description

Technical Field

[0001] This utility model relates to the field of biochemical detection equipment technology, and in particular to a sample loading arm device and a portable automatic biochemical analyzer. Background Technology

[0002] Portable automated biochemical analyzers are devices that determine liquid concentration by comparing samples of unknown concentration with standard substances of known concentration or by using the Lambert-Beer law based on the characteristic absorption spectra of substances in the ultraviolet and visible light regions, or by using the molar absorptivity method. The sample loading arm is the device used to aspirate and transport samples within the biochemical analyzer. This arm needs to perform lifting and rotation movements to facilitate sample aspiration and transport. However, existing sample loading arm devices all use an external motor driving a belt to move the needle up, down, and rotate. On the one hand, the external motor and belt inevitably increase the space occupied by the sample loading arm, contradicting the "convenience" of an automated biochemical analyzer. On the other hand, the motor driving the needle via the belt can lead to an inconsistent transmission ratio due to belt elastic slippage and hysteresis losses. Over time, this can cause poor accuracy in the needle's movement position, affecting the smooth progress of the analysis.

[0003] Therefore, how to improve the accuracy of the sample loading arm device in driving the position of the sample needle, while reducing the space occupied by the sample loading arm device, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a sample loading arm device to reduce the space occupied by the sample loading arm device and improve the accuracy of the sample loading arm device in driving the position of the sample needle.

[0005] Another objective of this invention is to provide a portable automated biochemical analyzer that includes the above-mentioned sample loading arm device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sample loading arm device, comprising:

[0008] Gears and a lifting motor, wherein the lifting motor is fixed on the upper sample support, and the lifting motor drives the gear to rotate so as to drive the rocker arm to rotate;

[0009] A slider is provided with a guide rod, and the slider moves along the axial direction of the guide rod when the rocker arm rotates. A splined shaft is provided on the slider.

[0010] A needle holder, on which a sample needle is provided, and the needle holder is fixedly connected to the spline shaft (13) of the cylindrical configuration;

[0011] A rotating mechanism is connected to the needle holder to drive the sample needle to perform a rotational action.

[0012] Preferably, in the above-mentioned sample loading arm device, the outer wall of the spline shaft is provided with spline bushings at intervals, the spline shaft is engaged with the inner hole opened on the slider, and the axis of the spline shaft is parallel to the axis of the guide rod. The two guide holes of the slider are coaxial with the guide rod, and the rotation axis of the rocker arm is perpendicular to the spline shaft.

[0013] Preferably, in the above-described sample loading arm device, the rotating mechanism includes:

[0014] Rotary electric motor;

[0015] A first pulley, a synchronous toothed belt, and a second pulley are provided. The synchronous toothed belt is sleeved on the outer periphery of the first pulley and the second pulley and meshes with the teeth of the first pulley and the second pulley. The first pulley is fixedly connected to the motor shaft of the rotary motor, and the second pulley is a driven pulley and is snapped and fixed to the outer wall of the splined bushing.

[0016] Preferably, in the above-mentioned sample loading arm device, the gear includes a driving gear and a driven gear, the lifting motor drives the motor through the meshing of the driving gear and the driven gear, the driven gear is fixedly connected to the rocker arm, and the rocker arm is drivenly connected to the slider.

[0017] Preferably, in the above-described sample loading arm device, the tip circle diameter of the second pulley is larger than that of the first pulley.

[0018] Preferably, in the above-mentioned sample loading arm device, the two sides of the slider are circular hole structures and at least two circular holes are spaced apart. A linear bearing is provided in the circular hole of the slider, and the guide rod passes through the linear bearing to slide with the linear bearing.

[0019] Preferably, in the above-mentioned sample loading arm device, the motor shaft of the lifting motor is fixedly integrated with the drive gear, or

[0020] The motor shaft of the lifting motor is connected to the drive gear through a transition fit via a shaft hole.

[0021] Preferably, in the above-mentioned sample loading arm device, both the lifting motor and the rotary motor are stepper motors.

[0022] Preferably, in the above-mentioned sample loading arm device, a bearing sleeve is embedded in the sample loading support, and the spline bushing is fixedly disposed in the bearing sleeve.

[0023] A portable automated biochemical analyzer includes the sample loading arm device described in any of the above embodiments.

[0024] A portable automated biochemical analyzer includes a sample loading arm device as provided in any of the above embodiments.

[0025] As can be seen from the above technical solution, the sample loading arm device provided by this utility model includes a splined shaft assembly, a lifting motor, a slider, a needle holder, and a rotating mechanism. The lifting motor drives the drive gear to rotate. Since the lifting motor only needs to transmit power between the motor shaft and the driven gear to drive the slider, the high-efficiency transmission performance of the gear and the low-friction performance of the deep groove ball bearing can efficiently push the slider up and down, improving both transmission efficiency and design precision. The slider and splined shaft utilize a shaft hole fit, and the slider is in contact with the lifting motor on the rocker arm. When the motor drives the rotation, it moves along the axial direction of the guide rod. The needle holder is equipped with a sample aspiration needle and a connecting ring. The connecting rod is cylindrical and sleeved on the outer circumference of the spline shaft. At the same time, the end of the connecting rod is fixedly connected to the slider. During the rotation of the lead screw, the slider moves along the axial direction of the guide rod, thereby driving the spline shaft to change position, which in turn drives the sample aspiration needle to change position. The drive gear switches between clockwise and counterclockwise rotation to drive the sample aspiration needle to perform upward or downward movements. The rotation mechanism is connected to the needle holder to drive the needle holder to rotate, thereby driving the sample aspiration needle to perform rotational movements. The sample loading arm device provided by this utility model uses a lifting motor to directly drive the gear to rotate, and drives the needle seat and the sample needle to perform lifting and lowering movements along the connecting rod axis through a slider that cooperates with the spline shaft. The drive structure is simple, and the efficient transmission and compactness of the gears reduce the space occupied by the sample loading arm device, improve the design accuracy and the convenience of the biochemical analyzer that includes the sample loading arm device. In addition, compared with the belt drive method in the prior art, the meshing transmission of the rocker arm and the slider is more stable and less prone to slippage, ensuring the smooth use of the sample loading arm device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the sample loading arm device provided in an embodiment of this utility model;

[0028] Figure 2 for Figure 1 Exploded views of the components;

[0029] Figure 3 A schematic diagram of the sample loading arm device in the rising state provided in this embodiment of the utility model;

[0030] Figure 4 A schematic diagram of the sample loading arm device in the rising and rotating states provided in an embodiment of this utility model;

[0031] Figure 5 An exploded view of the connection between the lifting motor and the splined shaft provided in an embodiment of this utility model;

[0032] Figure 6 for Figure 5 Assembly drawing;

[0033] Figure 7 for Figure 5 Schematic diagram of the middle slider structure;

[0034] Figure 8 This is a schematic diagram of the position structure of the guide rod and slider provided in an embodiment of the present utility model;

[0035] Figure 9 for Figure 8 A schematic diagram of the orthographic projection structure;

[0036] Among them, 01. Sample support; 02. Rotating shaft; 03. Lifting motor; 04. Rotary motor; 05. First pulley; 07. Synchronous toothed belt; 08. Second pulley; 09. Bearing sleeve; 10. Bearing; 12. Splined bushing; 13. Splined shaft; 14. Needle seat; 15. Sample feeding needle; 17. Slider; 19. Rocker arm; 20. Driven gear; 21. Driving gear; 22. Linear bearing; 23. Guide rod. Detailed Implementation

[0037] The core of this utility model is to disclose a sample loading arm device, so as to reduce the space occupied by the sample loading arm device and improve the accuracy of the sample loading arm device in driving the position of the sample needle.

[0038] Another core aspect of this invention is to provide a portable automated biochemical analyzer that includes the aforementioned sample loading arm device.

[0039] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention as described in the claims.

[0040] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the sample loading arm device provided in this embodiment includes a splined shaft 13, a driving gear 21, a driven gear 20, a rocker arm 19, a lifting motor 13, a slider 17, a needle holder 14, and a rotating mechanism. The lifting motor 13 is fixed to the sample loading support 01 and drives the driving gear 21 to rotate. The driving gear 21 drives the driven gear 20 to rotate. The rocker arm 19, fixed to the driven gear 20, rotates together with the driven gear 20. Since the lifting motor 13 drives the rocker arm 19 using a gear transmission structure, only the motor shaft of the lifting motor 13 needs to transmit the gear transmission, resulting in a compact structure and improved design precision. The slider 17 and the splined shaft 19... The shaft is connected and fitted by bearings, and the slider 17 moves axially along the axis of the guide rod 23 when the rocker arm 19 is driven to rotate by the lifting motor 03. The needle seat 14 is provided with a sample dispensing needle 15 for aspirating samples and a spline shaft 13. The connection between the needle seat 14 and the spline shaft 13 is cylindrical and sleeved on the outer circumference of the spline shaft 13. At the same time, the bottom end of the spline shaft 13 is connected to the slider 17 by bearings. During the rotation of the lifting motor 03, the slider 17 will move axially along the axis of the guide rod 23, thereby driving the spline shaft 13 to change position, which in turn drives the sample dispensing needle 15 to change position. The rocker arm 19 can switch between clockwise and counterclockwise rotation to drive the sample dispensing needle 15 to perform rising or falling movements.

[0041] The rotating mechanism is connected to the splined bushing 12 to drive the needle holder 14 to rotate, thereby driving the sample dispensing needle 15 to perform a rotational action.

[0042] The sample loading arm device provided in this embodiment of the utility model uses a lifting motor 03 to directly drive the drive gear 21 to rotate, and drives the needle seat 14 and the sample needle 15 to perform lifting and lowering actions along the axial direction of the guide rod 23 through the slider 17 that cooperates with the spline shaft 13 bearing. The drive structure is direct and efficient. Moreover, the lifting motor 03 uses gear transmission and slider transmission, which can reduce the space occupied by the sample loading arm device, improve the design accuracy and the portability and ease of use of the biochemical analyzer containing the sample loading arm device. In addition, compared with the belt transmission method in the prior art, the transmission through gear meshing transmission and the rolling transmission of the rocker arm slider 17 is more stable and less prone to slippage, ensuring the smooth use of the sample loading arm device.

[0043] To ensure that the slider 17 can move smoothly along the axis of the spline shaft during the rotation of the rocker arm 19, in a specific embodiment of this utility model, the slider 17 has guide holes spaced apart on both sides and is fixed to the linear bearing 22. The axis of the guide holes spaced apart on both sides of the slider 17 is parallel to the axis of the spline shaft. The guide rod 23 remains stable during the movement of the slider, and the outer wall of the guide rod 23 rolls with the outer circumference of the linear bearing 22 to limit the rotation of the slider 17 when the rocker arm 19 rotates. The slider 17 can only move along the axis of the guide rod 23. At the same time, the axis of the guide rod 23 is parallel to the axis of the guide hole of the slider 17, that is, the guiding direction of the guide rod 23 for the slider 17 is the same as the axis of the spline shaft 13.

[0044] It should be noted that the axis of the guide rod 23 is preferably collinear with the axis of the spline shaft, so that the slider 17 is subjected to a more uniform limiting force by the guide rod 23.

[0045] In addition, a bearing sleeve 09 is embedded in the upper support 01, and the spline bushing 12 is fixedly installed inside the bearing sleeve 09.

[0046] Furthermore, in the sample loading arm device provided in this embodiment of the present invention, the rotating mechanism includes a rotary motor 04, a first pulley 05, a second pulley 08, and a synchronous toothed belt 07. The motor shaft of the rotary motor 04 is fixedly connected to the first pulley 05 to drive the first pulley 05 to rotate. Preferably, the motor shaft of the rotary motor 04 is inserted into and fastened to the central axis of the first pulley 05. The synchronous toothed belt 07 is sleeved on the outer periphery of the first pulley 05 and the second pulley 08 and meshes with the teeth of the first pulley 05 and the second pulley 08. The rotary motor 04 drives the first pulley 05 to rotate and drives the second pulley 08 to rotate through the synchronous toothed belt 07. The second pulley 08 is fixed to the outer wall of the splined bushing 12 to drive the splined shaft 13 to rotate along its axis as the center line of rotation. The second pulley 08 and the splined bushing 12 are fixed as an integral structure. Therefore, the splined shaft 13 will rotate synchronously with the splined bushing 12, thereby realizing the rotation action of the sample loading needle 15.

[0047] It should be noted that the synchronous toothed belt 07 drives the second pulley 08 to rotate by means of friction and the force between the teeth during meshing. Compared with ordinary belt drives, it has a lower risk of slippage and better torque transmission.

[0048] It should be further explained that the splined bushing 12 is preferably fixedly connected to the second pulley 08, and the second pulley 08, by fitting with the bearing 10, can ensure the stability of the rotation of the second pulley 08 and the splined shaft 13 relative to the upper support 01.

[0049] Furthermore, such as Figure 5 , Figure 6 class Figure 7As shown, in a specific embodiment of this utility model, the lifting motor 03 is connected to the driving gear 21, that is, the motor shaft of the lifting motor 03 is inserted into the hole of the driving gear 21, and the driven gear 20 is installed on the rotating shaft 02. The driven gear 20 and the rotating shaft 02 are fixed by a threaded connection. The rotating shaft 02 is installed on the upper support 01 by a bearing, so that the driven gear 20 can rotate smoothly in the bearing. The rocker arm 19 is fixed to the driven gear 20 by a thread. The driving gear 21 and the driven gear 20 mesh to transmit the motor power to the driven gear 20, thereby driving the rocker arm 19 to rotate. At the same time, the second end of the rocker arm 19 is embedded in the groove of the slider 17 through a bearing, thereby realizing the conversion of the motor power into the up and down movement of the slider. This meshing movement of the driving gear 21 and the driven gear 20 can improve the transmission efficiency, improve the accuracy of the mechanism movement, reduce the risk of damage to the lifting motor 03, and facilitate the replacement of the driving gear 21 and the driven gear 20, thus facilitating the maintenance of the entire mechanism.

[0050] Furthermore, in the sample loading arm device provided in this embodiment of the present invention, the tooth tip circle diameter of the second pulley 08 is larger than that of the first pulley 05, that is, the size of the driving wheel in the rotating mechanism is smaller than that of the driven wheel, so as to appropriately reduce the transmission speed and avoid the large adjustment of the rotation angle, which would affect the accuracy of the rotation position adjustment of the sample loading needle 15.

[0051] Furthermore, in order to ensure stable relative sliding motion between slider 17 and guide rod 23, such as Figure 8 and Figure 9 As shown, in a specific embodiment of this utility model, at least two guide holes are provided on the side of the slider 17, and the two guide holes are spaced apart. The inner walls of the two guide holes are fixedly connected to the linear bearing 22. The axial direction of the guide holes is parallel to the axial direction of the spline shaft 13. The guide rod 23 is fitted into the inner wall of the linear bearing 22, which enables the slider 17 and the guide rod 23 to slide stably relative to each other without relative rotation.

[0052] Furthermore, since the lifting and rotating actions of the sample loading needle 15 are both reciprocating actions, in the sample loading arm device provided in this embodiment of the present invention, it is preferable that the lifting motor 03 and the rotating motor 04 are both servo motors. Servo motors have high control precision and good operational stability, and at the same time, they have a compact structure, which can reduce the space occupied by the motor and the sample loading arm device.

[0053] This utility model embodiment also provides a portable automated biochemical analyzer, which is equipped with at least one sample loading arm device provided in any of the above embodiments.

[0054] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sample loading arm device, characterized in that, include: Gear and lifting motor (03), the lifting motor is fixed on the upper sample support (01), the lifting motor (03) drives the gear to rotate so as to drive the rocker arm (19) to rotate; A slider (17) is provided with a guide rod (23). The slider (17) moves along the axial direction of the guide rod (23) when the rocker arm (19) rotates. A spline shaft (13) is provided on the slider (17). A needle holder (14) is provided with a sample needle (15), and the needle holder (14) is fixedly connected to the spline shaft (13) of the cylindrical configuration; The rotating mechanism is connected to the needle holder (14) to drive the sample needle (15) to perform a rotational action.

2. The sample loading arm device as described in claim 1, characterized in that, The outer wall of the spline shaft (13) is provided with spline bushings (12) at intervals. The spline shaft (13) is engaged with the inner hole opened on the slider (17). The axis of the spline shaft (13) is parallel to the axis of the guide rod (23). The two guide holes of the slider (17) are coaxial with the guide rod (23). The rotation axis of the rocker arm (19) is perpendicular to the spline shaft (13).

3. The sample loading arm device as described in claim 2, characterized in that, The rotating mechanism includes: Rotary electric motor (04); A first pulley (05), a synchronous toothed belt (07), and a second pulley (08). The synchronous toothed belt (07) is sleeved on the outer periphery of the first pulley (05) and the second pulley (08) and meshes with the teeth of the first pulley (05) and the second pulley (08). The first pulley (05) is fixedly connected to the motor shaft of the rotary motor (04). The second pulley (08) is a driven pulley and is snapped and fixed to the outer wall of the spline bushing (12).

4. The sample loading arm device as described in claim 1, characterized in that, The gears include a driving gear (21) and a driven gear (20). The lifting motor (03) is driven by meshing with the driven gear (20) through the driving gear (21). The driven gear (20) is fixedly connected to the rocker arm (19). The rocker arm (19) is driven by the slider (17).

5. The sample loading arm device as described in claim 3, characterized in that, The tip circle diameter of the second pulley (08) is larger than that of the tip circle diameter of the first pulley (05).

6. The sample loading arm device as described in claim 2, characterized in that, The slider (17) has a circular hole structure on both sides and at least two circular holes are spaced apart. A linear bearing (22) is provided in the circular hole of the slider (17), and the guide rod (23) passes through the linear bearing (22) to slide with the linear bearing (22).

7. The sample loading arm device as described in claim 4, characterized in that, The motor shaft of the lifting motor (03) is fixed to the drive gear (21) as a single unit, or The motor shaft of the lifting motor (03) is connected to the drive gear (21) through a shaft hole transition fit.

8. The sample loading arm device as described in claim 3, characterized in that, Both the lifting motor (03) and the rotary motor (04) are stepper motors.

9. The sample loading arm device as described in claim 1, characterized in that, The sample support (01) is fitted with a bearing sleeve (09), and the spline bushing (12) is fixedly installed inside the bearing sleeve (09).

10. A portable automated biochemical analyzer, characterized in that, Includes the sample loading arm device as described in any one of claims 1-9.

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