Sample loading arm device and portable automatic biochemical analyzer

Abstract

The sample loading arm device comprises a spline shaft sleeve and a lifting motor, the lifting motor is used for driving a gear, the gear is connected with a rocker arm connecting rod, and then a sliding block is driven to move up and down through the rotating motion of the rocker arm connecting rod; the sliding block is matched with the spline shaft, and the sliding block moves in the axial direction of the guide rod when the rocker arm rotates; a sample adding needle and a cylindrical connecting rod are arranged on the needle seat, the connecting rod is arranged on the periphery of the spline shaft in a sleeving mode, and the end of the connecting rod is fixedly connected with the sliding block; and the rotating mechanism is in transmission connection with the needle seat to drive the sample adding needle to rotate. According to the sample loading arm device, the lifting motor is arranged in a gear transmission mode, meanwhile, the lifting motor drives the lead screw gear to rotate so as to drive the sample loading needle to ascend and descend, and compared with belt transmission driving, driving is more accurate. The invention also discloses a portable automatic biochemical analyzer comprising the sample loading arm device.

Description

Technical Field

[0001] The present invention relates to the technical field of biochemical detection equipment, in particular to a sample loading arm device and a portable automatic biochemical analyzer. Background Art

[0002] A portable automatic biochemical analyzer is a device that detects the concentration of liquid by comparing samples of unknown concentration with standard substances of known concentration or performing quantitative analysis based on the molar absorptivity method based on the characteristic absorption spectrum produced by substances in the ultraviolet and visible light regions, combined with the Lambert-Beer law. The device used to absorb and transport samples in the biochemical analyzer is a loading arm device. The loading arm device needs to perform lifting and rotation movements to meet the needs of sample absorption and transportation for the sample loading target. However, existing loading arm devices all use an external motor to drive the belt to drive the lifting and rotation of the loading needle. On the one hand, the setting of the external motor and belt will inevitably increase the space occupied by the loading arm device, which is contrary to the "convenience" of the automatic biochemical analyzer. On the other hand, the motor drives the loading needle through the belt, which will cause the transmission ratio to be inconsistent due to the elastic sliding and hysteresis loss of the belt. Long-term use will cause poor accuracy of the movement position of the loading needle, affecting the smooth progress of the test.

[0003] Therefore, how to improve the accuracy of the loading arm device in driving the position of the sample needle while reducing the space occupied by the loading arm device is a problem that those skilled in the art urgently need to solve. Summary of the Invention

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

[0005] Another object of the present invention is to provide a portable automatic biochemical analyzer comprising the above-mentioned loading arm device.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A loading arm device, comprising:

[0008] Gear and lifting motor, the lifting motor is fixed on the sample loading support, and the lifting motor drives the gear to rotate to drive the rocker arm to rotate;

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

[0010] A needle seat, on which a sample injection needle is provided, wherein the needle seat is fixedly connected to the cylindrical spline shaft (13);

[0011] The rotating mechanism is connected to the needle seat to drive the sample adding needle to perform a rotational action.

[0012] Preferably, in the above-mentioned loading arm device, a spline shaft sleeve is arranged at intervals on the outer wall of the spline shaft, the spline shaft cooperates 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-mentioned loading arm device, the rotating mechanism includes:

[0014] Rotating electric machines;

[0015] A first pulley, a synchronous toothed belt and a second pulley, the synchronous toothed belt sleeve is arranged 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 rotating motor, and the second pulley is a driven pulley and is clamped and fixed to the outer wall of the spline sleeve.

[0016] Preferably, in the above-mentioned loading arm device, the gear includes a driving gear and a driven gear, the lifting motor is driven by meshing the driving gear with the driven gear, the driven gear is fixedly connected to the rocker arm, and the rocker arm is transmission-connected to the slider.

[0017] Preferably, in the above-mentioned loading arm device, the tooth top circle diameter of the second pulley is larger than the tooth top circle diameter of the first pulley.

[0018] Preferably, in the above-mentioned loading arm device, the two sides of the slider are circular hole structures and at least two circular holes are arranged at intervals. Linear bearings are arranged in the circular holes of the slider, and the guide rod is passed through the linear bearing to slide with the linear bearing.

[0019] Preferably, in the above-mentioned loading arm device, the motor shaft of the lifting motor is fixed integrally with the driving gear, or

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

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

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

[0023] A portable automatic biochemical analyzer comprises the sample loading arm device described in any one of the above embodiments.

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

[0025] It can be seen from the above technical solution that the loading arm device provided by the present invention includes a spline shaft set, a lifting motor, a slider, a needle seat and a rotating mechanism, wherein the lifting motor is used to drive the driving gear to rotate, and since the driving of the slider by the lifting motor only requires the motor shaft of the lifting motor to transmit to the driven gear, the efficient transmission performance of the gear and the low friction performance of the deep groove ball bearing can be used to efficiently push the slider up and down, which can improve the transmission efficiency and the precision of the design; the slider and the spline shaft are over-matched by the shaft hole, and the slider is driven by the lifting motor when the rocker arm is When driven to rotate, it moves along the axial direction of the guide rod. The needle seat is provided with a sampling needle and a connecting ring for sucking samples. 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 screw rod, the slider will move along the axial direction of the guide rod, and at the same time drive the spline shaft to achieve position change, thereby driving the position change of the sampling needle, and the active gear switches the clockwise or counterclockwise rotation direction to drive the sampling needle to perform an upward or downward action; the rotating mechanism is connected to the needle seat to drive the needle seat to rotate and drive the sampling needle to rotate. The loading arm device provided by the present invention uses a lifting motor to directly drive the gear to rotate, and drives the needle seat and the sample adding needle to perform a lifting action along the axis of the connecting rod through a slider that cooperates with the spline shaft. The driving structure is simple, and the efficient transmission and compactness of the gears are utilized to reduce the space occupied by the loading arm device, improve the design accuracy and the convenience of the biochemical analyzer including the loading arm device. In addition, compared with the belt drive transmission method in the prior art, the transmission through the meshing transmission of the rocker arm and the slider is stable and less likely to cause the risk of slipping, thereby ensuring the smooth use of the loading arm device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic structural diagram of a loading arm device provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Exploded view of components;

[0029] Figure 3 A schematic diagram of the sample loading arm device in the rising state provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the rising and rotating state of the loading arm device provided in an embodiment of the present invention;

[0031] Figure 5 An exploded diagram of the connection between the lifting motor and the spline shaft provided in an embodiment of the present invention;

[0032] Figure 6 for Figure 5 Assembly drawing;

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

[0034] Figure 8 A schematic diagram of the position structure of the guide rod and the slider provided in an embodiment of the present invention;

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

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

[0037] The core of the present invention is to disclose 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 loading needle.

[0038] Another core of the present invention is to provide a portable automatic biochemical analyzer comprising the above-mentioned loading arm device.

[0039] To help those skilled in the art better understand the present invention, embodiments of the present invention are described below with reference to the accompanying drawings. The embodiments described below do not limit the invention as set forth in the claims. Furthermore, the entire contents of the configurations shown in the embodiments below are not necessarily required to serve as the solution to the invention as set forth in the claims.

[0040] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the loading arm device provided by the embodiment of the present invention includes a spline shaft 13, a driving gear 21, a driven gear 20, a rocker arm 19, a lifting motor 03, a slider 17, a needle seat 14 and a rotating mechanism, wherein the lifting motor 03 is fixed on the loading support 01, and is used to drive the driving gear 21 to rotate, and the driving gear 21 drives the driven gear 20 to rotate, and the rocker arm 19 fixed on the driven gear 20 rotates together with the driven gear 20, and because the lifting motor 03 drives the rocker arm 19 using a gear transmission structure, only the motor shaft of the lifting motor 03 is required to drive the gear, so the structure is compact, and the precision of the design is improved; the slider 17 and the spline shaft The slider 17 is connected through bearings, and when the rocker arm 19 is driven to rotate by the lifting motor 03, it makes axial movement along the axis of the guide rod 23. The needle seat 14 is provided with a sample needle 15 and a spline shaft 13 for aspirating samples. The connection between the needle seat 14 and the spline shaft 13 is a cylindrical configuration and is sleeved on the outer periphery of the spline shaft 13. At the same time, the bottom end of the spline shaft 13 is connected to the slider 17 through a bearing. During the rotation of the lifting motor 03, the slider 17 will make axial movement along the axis of the guide rod 23, and at the same time drive the spline shaft 13 to achieve position change, thereby driving the position change of the sample needle 15, and the rocker arm 19 switches the rotation direction clockwise or counterclockwise to drive the sample needle 15 to perform an upward or downward action.

[0041] The rotating mechanism is in transmission connection with the spline shaft sleeve 12 to drive the needle seat 14 to rotate and drive the sample injection needle 15 to perform a rotational motion.

[0042] The loading arm device provided in an embodiment of the present invention uses a lifting motor 03 to directly drive the driving gear 21 to rotate, and drives the needle seat 14 and the sample loading needle 15 to perform a lifting action along the axial direction of the guide rod 23 through the slider 17 that cooperates with the bearing of the spline shaft 13. The driving structure is direct and efficient, and the lifting motor 03 uses gear transmission and slider transmission to reduce the space occupied by the loading arm device, improve the design accuracy and the portability and ease of use of the biochemical analyzer containing the loading arm device. In addition, compared with the belt drive transmission method in the prior art, the transmission through gear meshing transmission and the rolling transmission of the rocker arm slider 17 is stable and not prone to slippage risks, thereby ensuring the smooth use of the loading arm device.

[0043] In order 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 the present invention, guide holes are provided on both sides of the slider 17 and are fixed to the linear bearings 22, and the axes of the guide holes provided on both sides of the slider 17 are parallel to the axial direction of the spline shaft. The guide rod 23 maintains a stable state during the movement of the slider, and the outer wall of the guide rod 23 rolls with the outer periphery 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 axial direction of the guide rod 23, and 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 to the slider 17 is the same as the axial direction of the spline shaft 13.

[0044] It should be noted that the axis of the guide rod 23 is preferably colinear with the axis of the spline shaft so that the force acting on the slider 17 by the guide rod 23 to limit the position is more uniform.

[0045] In addition, a bearing sleeve 09 is embedded in the sample loading support 01 , and the spline shaft sleeve 12 is fixedly disposed in the bearing sleeve 09 .

[0046] Furthermore, in the loading arm device provided in an embodiment of the present invention, the rotating mechanism includes a rotating motor 04, a first pulley 05, a second pulley 08 and a synchronous toothed belt 07, wherein the motor shaft of the rotating motor 04 is fixedly connected to the first pulley 05 to drive the first pulley 05 to rotate. Preferably, the motor shaft of the rotating motor 04 is inserted into and fastened to the center axis position of the first pulley 05, and 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 gear teeth of the first pulley 05 and the second pulley 08. The rotating 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 spline sleeve 12 to drive the spline shaft 13 to rotate along its axis as the rotation center line. The second pulley 08 and the spline sleeve 12 are fixed as an integral structure, so the spline shaft 13 will rotate synchronously with the spline sleeve 12, thereby realizing the rotation action of the sample addition 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 when engaged. Compared with ordinary belt drives, the risk of slippage is small and the torque transmission effect is better.

[0048] It should be further explained that the spline sleeve 12 is preferably fixedly connected to the second pulley 08 , and the second pulley 08 is fitted with the bearing 10 to ensure the rotational stability of the second pulley 08 and the spline shaft 13 relative to the loading support 01 .

[0049] Furthermore, if Figure 5 、 Figure 6 class Figure 7As shown, in a specific embodiment of the present invention, 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 mounted on the sample support 01 through 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 are meshed 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 inserted into the slide groove of the slider 17 through the bearing, thereby converting 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, which facilitates the maintenance of the entire mechanism.

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

[0051] Furthermore, in order to ensure the stable relative sliding motion between the slider 17 and the guide rod 23, as shown in FIG. Figure 8 and Figure 9 As shown, in a specific embodiment of the present invention, 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 hole is parallel to the axial direction of the spline shaft 13. The guide rod 23 is mounted on the inner wall of the linear bearing 22, which enables the slider 17 and the guide rod 23 to achieve stable relative sliding without relative rotation.

[0052] Furthermore, since the lifting and rotating movements of the sample loading needle 15 are both reciprocating movements, in the sample loading arm device provided in the embodiment of the present invention, it is preferred that the lifting motor 03 and the rotating motor 04 are both servo motors. The servo motor has high control accuracy and good operating stability, and at the same time, has a compact structure, which can reduce the space occupied by the motor and the sample loading arm device.

[0053] An embodiment of the present invention further provides a portable automatic biochemical analyzer, which is provided with at least one sample loading arm device provided by any of the above embodiments.

[0054] The terms "first," "second," "left," and "right," etc., in the specification and claims of the present invention and the accompanying drawings are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0055] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A loading arm device, characterized in that: include: A gear and a lifting motor (03), wherein the lifting motor is fixed on the sample loading support (01), and the lifting motor (03) drives the gear to rotate to drive the rocker arm (19) to rotate; A slider (17) is provided with a guide rod (23) therethrough, wherein the slider (17) moves axially along the guide rod (23) when the rocker arm (19) rotates, and a spline shaft (13) is provided on the slider (17); A needle seat (14), wherein a sample injection needle (15) is provided on the needle seat (14), and the needle seat (14) is fixedly connected to the cylindrical spline shaft (13); The rotating mechanism is in transmission connection with the needle seat (14) to drive the sample injection needle (15) to perform a rotational action.

2. The loading arm device according to claim 1, characterized in that: The outer wall of the spline shaft (13) is provided with a spline shaft sleeve (12) at intervals, the spline shaft (13) is matched with the inner hole opened on the slider (17), and 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), and the rotation axis of the rocker arm (19) is perpendicular to the spline shaft (13).

3. The loading arm device according to claim 2, characterized in that: The rotating mechanism comprises: Rotating motor (04); A first pulley (05), a synchronous toothed belt (07) and a second pulley (08), wherein 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 rotating motor (04), and the second pulley (08) is a driven pulley and is clamped and fixed to the outer wall of the spline sleeve (12).

4. The loading arm device according to 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), and the rocker arm (19) is transmission-connected to the slider (17).

5. The loading arm device according to claim 3, characterized in that: The tooth top circle diameter of the second pulley (08) is greater than the tooth top circle diameter of the first pulley (05).

6. The loading arm device according to claim 2, characterized in that: The two sides of the slider (17) are circular hole structures and at least two circular holes are arranged at intervals. A linear bearing (22) is arranged in the circular hole of the slider (17), and the guide rod (23) is passed through the linear bearing (22) to slide with the linear bearing (22).

7. The loading arm device according to claim 4, characterized in that: The motor shaft of the lifting motor (03) is fixed integrally with the driving gear (21), or The motor shaft of the lifting motor (03) is connected to the driving gear (21) through a shaft hole transition fit.

8. The loading arm device according to claim 3, characterized in that: The lifting motor (03) and the rotating motor (04) are both stepping motors.

9. The loading arm device according to claim 1, characterized in that: The sample loading support (01) is embedded with a bearing sleeve (09), and the spline shaft sleeve (12) is fixedly arranged in the bearing sleeve (09).

10. A portable automatic biochemical analyzer, characterized in that: The device comprises a loading arm device as described in any one of claims 1 to 9.

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