Variable-speed stirring and blending device and full-automatic biochemical analyzer

Abstract

The utility model relates to a variable-speed stirring and blending device and a full-automatic biochemical analyzer, the variable-speed stirring and blending device comprises a stirring and blending upper component and a stirring and blending lower component, the stirring and blending upper component comprises a round belt, a variable-speed direct-current brush motor, a stirring paddle and a stirring paddle round belt pulley so as to realize autorotation of the stirring paddle; the lower stirring and mixing component comprises a rotating arm base and a spline shaft which are connected with each other, and a lifting motor and a rotating motor which are fixedly connected to the rotating arm base, so that the reciprocating circulating rotation and lifting of the upper stirring and mixing component are realized. Compared with the prior art, the stirring device is simple in structure and easy to maintain, the stirring paddle adopts a reciprocating multi-station operation and anti-collision structure, so that the stirring efficiency is improved, the rotating speed of each stirring paddle is independently controlled by adopting a variable-speed direct-current brush motor with a board card, the stirring effect of different solvents and the cleaning requirement of the stirring paddle are met, and the stirring device is suitable for popularization and application. And the accuracy of a test result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of in vitro diagnostic instruments, in particular to a variable-speed stirring and mixing device and a full-automatic biochemical analyzer. Background Art

[0002] The stirring device is one of the important parts of the fully automatic biochemical analyzer. When working, it drives the stirring paddle to rotate at high speed to fully mix the sample and reagent, making the reaction more complete to ensure the accuracy of the test results.

[0003] Currently, most fully automatic biochemical analyzers usually use a structure in which a stirring device is equipped with a stirring paddle. The stirring paddle needs to be cleaned after completing the mixing work before the next stirring cycle can be carried out, resulting in low stirring efficiency and difficulty in meeting the needs of high-speed testing.

[0004] In order to improve the stirring efficiency and avoid cross contamination, the stirring devices of some fully automatic biochemical analyzers are equipped with multiple stirring components, which can stir the reaction solutions in multiple reaction containers at a time, and enable the stirring device to perform mixing and stirring paddle cleaning work simultaneously in one stirring cycle. However, most of the existing stirring devices do not have an anti-collision function, and cannot effectively avoid damage to the stirring paddle and the reaction cup, which invisibly increases the equipment cost, and a single constant speed stirring method cannot meet the mixing requirements of different reaction solutions. Chinese patent CN219879724U provides a stirring device for a fully automatic biochemical analyzer, including a stirring needle assembly, a stirring arm horizontal drive assembly, and a stirring arm vertical drive assembly, which can effectively improve the stirring accuracy and efficiency, but the invention does not use a separate motor to control the rotation speed of each stirring needle. This method has the problem of uneven stirring of different reagents, and does not take into account the disassembly problem of the stirring needle and the anti-collision self-protection function of the stirring needle.

[0005] Therefore, the problems existing in the prior art need to be solved urgently. Utility Model Content

[0006] The purpose of the utility model is to provide a variable speed stirring and mixing device and a fully automatic biochemical analyzer in order to overcome the defects of the above-mentioned prior art, and to improve the stirring effect by using a stirring paddle capable of multi-station rotation and individually controllable speed to meet the needs of high-speed testing.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A variable speed stirring and mixing device comprises a stirring and mixing upper component and a stirring and mixing lower component;

[0009] The stirring and mixing upper component includes a circular belt, a plurality of variable speed DC brush motors, a plurality of stirring paddles, and a plurality of stirring paddle circular pulleys. The output end of the variable speed DC brush motor is connected to the stirring paddle circular pulley through a circular belt, and the stirring paddle circular pulley is connected to the stirring paddle. The stirring and mixing upper component is to provide power for the stirring paddle to rotate quickly.

[0010] The stirring and mixing lower component includes a rotating arm base and a spline shaft connected to each other, and a lifting motor and a rotating motor fixedly connected to the rotating arm base. The stirring and mixing upper component and the rotating arm base are connected via a spline shaft. The lifting motor can realize the vertical movement of the stirring and mixing upper component by driving the spline shaft to rise and fall, and the rotating motor can realize the rotation of the stirring and mixing upper component by driving the spline shaft to rotate.

[0011] Furthermore, the internal structure of the stirring paddle round pulley is a flat square hole. The stirring paddle and the flat square hole of the stirring paddle round pulley are matched through clearance. When the stirring paddle is subjected to a vertical external force, the stirring paddle will move in the vertical direction to unload the force, thereby preventing the stirring paddle from bending and being damaged or breaking the reaction cup. Moreover, such a structure makes it easier to replace the stirring paddle.

[0012] Further preferably, the stirring paddle has a spiral shape, an L shape or a flat straight shape.

[0013] Furthermore, the variable speed DC brushed motor is provided with a board, which is easy to plug and unplug and replace, and it is easier to control the speed of each motor, so that different reagents can be stirred more evenly.

[0014] Furthermore, the upper stirring and mixing component also includes a circular belt stirring paddle motor plate, a motor circular pulley, a dual motor fixing seat, a stirring pulley fixing seat, a stirring paddle circular pulley bearing, a clamping fixing seat, and a stirring paddle support column; the circular belt stirring paddle motor plate is equipped with multiple dual motor fixing seats and multiple stirring pulley fixing seats, the DC brushed motor is arranged on the dual motor fixing seat, and the stirring paddle is connected to the stirring pulley fixing seat.

[0015] Furthermore, the clamping fixing seat is fixed below the circular belt stirring paddle motor plate, and the clamping fixing plate and the circular belt stirring paddle motor plate are connected via fasteners.

[0016] Furthermore, the stirring and mixing lower component also includes a rotating motor synchronous pulley, a rotating motor synchronous belt, a rotating driven wheel, a bearing sleeve, a rotating bearing, a cantilever pin, a flanged toothed idler wheel, a lifting motor synchronous belt, and a lifting motor synchronous pulley;

[0017] The middle part of the lifting motor synchronous pulley is connected to the output end of the lifting motor. The cantilever pin and the rotating arm base are fixedly connected. The cantilever pin is pivotally connected to the toothed idler pulley with flange. The lifting motor synchronous pulley is drivingly connected to the toothed idler pulley with flange through the lifting motor synchronous belt.

[0018] A rotating bearing is embedded inside the bearing sleeve. The rotating driven pulley is installed above the bearing sleeve. The middle part of the rotating synchronous pulley is connected to the output end of the rotating motor. The rotating synchronous pulley is drivingly connected to the rotating driven pulley through the rotating motor synchronous belt.

[0019] Further, a bearing block, a synchronous belt connecting plate, a linear bearing and a guide shaft are installed on the rotating arm base.

[0020] The middle part of the spline shaft is sleeved and fixed on the rotating driven pulley. The lower end of the spline shaft is sleeved and fixed on the bearing block. The upper end of the spline shaft is connected to the clamping fixing seat.

[0021] A linear bearing is installed on the guide shaft. The bearing block is connected to the guide shaft through the linear bearing. The guide shaft is parallel to the spline shaft. The bearing block and the linear bearing can move in the vertical direction along the guide shaft. The spline shaft can move and be limited in the vertical direction through the guide shaft, preventing the spline shaft from shaking in the circumferential direction. At the same time, the cost of using the guide shaft is relatively low and the precision is relatively high.

[0022] The synchronous belt connecting plate is fixedly connected to the bearing block. The synchronous belt connecting plate is clamped and fixed on the lifting motor synchronous belt. When the lifting motor synchronous belt rotates, it drives the bearing block and the spline shaft to move up and down together.

[0023] Further, a lifting mechanical limit and a lifting photoelectric switch are also installed on the rotating arm base, which are used to realize an operation of lifting limit and detecting the origin, and a rotating mechanical limit and a rotating photoelectric switch, which are used to realize an operation of rotating limit and detecting the origin.

[0024] The present utility model also provides a fully automatic biochemical analyzer, including the variable-speed stirring and mixing device as described above.

[0025] Compared with the prior art, the present utility model has the following beneficial effects:

[0026] (1) The stirring paddle of the present utility model operates in a reciprocating multi-station manner, adding a cleaning position to achieve multiple cleanings, enabling the stirring device to simultaneously perform mixing and stirring paddle cleaning work within one stirring cycle, avoiding cross-contamination, and improving the stirring efficiency and the accuracy of test results.

[0027] (2) The present utility model designs an anti-collision structure in the vertical direction of the stirring paddle. Through the clearance fit between the stirring paddle and the flat square hole of the stirring paddle round belt pulley, when a vertical external force is applied, the stirring paddle will move in the vertical direction to bear the force, which plays a protective role for the stirring paddle and the reaction cup, preventing the stirring paddle from bending or breaking the reaction cup. At the same time, it is also convenient for the replacement of the stirring paddle, only need to insert and pull out, effectively saving the equipment cost.

[0028] (3) The present utility model adopts a high-speed DC brush motor, and a board card is connected to each motor, which is convenient to control the rotation speed of each stirring paddle to meet the mixing requirements of different reaction solvents and the cleaning requirements of the stirring paddle, and can achieve high-speed testing. Brief Description of the Drawings

[0029] Figure 1 is the overall structural schematic diagram of the stirring and mixing device of the present utility model;

[0030] Figure 2 is the structural schematic diagram of the upper stirring and mixing component of the stirring and mixing device of the present utility model;

[0031] Figure 3 is the structural schematic diagram of the lower stirring and mixing component of the stirring and mixing device of the present utility model.

[0032] The names corresponding to the reference numerals in the drawings are:

[0033] 1 - Upper stirring and mixing component, 1-1 - Round belt stirring paddle motor board, 1-2 - Round belt, 1-3 - Variable-speed DC brush motor, 1-4 - Motor round belt pulley, 1-5 - Double-motor fixed seat, 1-6 - Stirring belt pulley fixed seat, 1-7 - Stirring paddle, 1-8 - Stirring paddle round belt pulley bearing, 1-9 - Stirring paddle round belt pulley, 1-10 - Clamping fixed seat, 1-11 - Stirring paddle support column, 2 - Lower stirring and mixing component, 2-1 - Rotating arm base, 2-2 - Lifting motor, 2-3 - Rotating motor, 2-4 - Rotating motor synchronous belt pulley, 2-5 - Rotating motor synchronous belt, 2-6 - Spline shaft, 2-7 - Rotating driven wheel, 2-8 - Bearing sleeve, 2-9 - Rotating bearing, 2-10 - Cantilever pin, 2-11 - Toothed idler pulley with flange, 2-12 - Bearing seat, 2-13 - Synchronous belt connecting plate, 2-14 - Linear bearing, 2-15 - Guide shaft, 2-16 - Lifting motor synchronous belt, 2-17 - Lifting motor synchronous belt pulley. Detailed Description of the Preferred Embodiment

[0034] The present utility model will be described in detail below with reference to the drawings and specific embodiments. The following embodiments are implemented on the premise of the above technical solutions of the present utility model, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0038] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0039] Example 1

[0040] See also Figures 1-3 , a variable speed stirring and mixing device, comprising a stirring and mixing upper component 1 and a stirring and mixing lower component 2;

[0041] The stirring and mixing upper component 1 includes a circular belt 1-2, six variable speed DC brush motors 1-3, six stirring paddles 1-7, and six stirring paddle circular pulleys 1-9. The output end of the variable speed DC brush motor 1-3 is connected to the stirring paddle circular pulley 1-9 through the circular belt 1-2, and each stirring paddle circular pulley 1-9 is connected to a stirring paddle 1-7, so that a driving force for the stirring paddle 1-7 to rotate is formed, and each variable speed DC brush motor 1-3 can independently control the speed of each stirring paddle 1-7 to achieve different speeds for different projects;

[0042] The board card in a DC brushed motor refers to the motor control board, whose main function is to control the motor, including functions such as starting, stopping, forward and reverse rotation, and speed regulation of the motor. The control board drives the motor by receiving control signals, and the DC brushed motor is communicatively connected to an external computer terminal.

[0043] The lower stirring and mixing assembly 2 includes a rotating arm base 2-1 and a spline shaft 2-6 that are connected to each other, and a lifting motor 2-2 and a rotating motor 2-3 that are fixedly connected to the rotating arm base 2-1. The upper stirring and mixing assembly 1 and the rotating arm base 2-1 are connected by the spline shaft 2-6. The lifting motor 2-2 can drive the lifting of the spline shaft 2-6 to achieve the vertical movement of the upper stirring and mixing assembly 1, and the rotating motor 2-3 can drive the rotation of the spline shaft 2-6 to achieve the rotation of the upper stirring and mixing assembly 1.

[0044] The internal structure of the stirring paddle round pulley 1-9 is a flat square hole. The stirring paddle 1-7 and the flat square hole of the stirring paddle round pulley 1-9 are in clearance fit. When the stirring paddle 1-7 receives a vertical external force, the stirring paddle 1-7 will move in the vertical direction to unload the force, avoiding bending damage or breaking of the reaction cup by the stirring paddle 1-7. Moreover, such a structure is more convenient for replacing the stirring paddle 1-7. Only need to draw out the old stirring paddle 1-7 and insert a new one. According to the mixing requirements of different reagents, the stirring paddle 1-7 has a spiral shape, an L shape or a flat straight shape.

[0045] Please refer to Figure 2 , the upper stirring and mixing assembly 1 further includes a round belt stirring paddle motor board 1-1, a motor round pulley 1-4, a double motor fixing seat 1-5, a stirring pulley fixing seat 1-6, a stirring paddle round pulley bearing 1-8, a clamping fixing seat 1-10, and a stirring paddle support column 1-11. Installing the stirring paddle support column 1-11 on the round belt stirring paddle motor board 1-1 is to support the stirring paddle round pulley 1-9 and the DC brushed motor 1-3. Installing the stirring paddle round pulley bearings 1-8 at both ends of the stirring paddle round pulley 1-9 is to facilitate rotation. Put the round belt 1-2 on the stirring paddle round pulley 1-9 equipped with bearings, and press the bearing with the stirring pulley fixing seat 1-6. Thus, a structure for preventing vertical force leakage is completed.

[0046] Please refer to Figure 2 , three double motor fixing seats 1-5 and three stirring pulley fixing seats 1-6 are installed on the round belt stirring paddle motor board 1-1. Two DC brushed motors 1-3 with board cards are arranged on one double motor fixing seat 1-5, and two stirring paddles 1-7 are connected to one stirring pulley fixing seat 1-6. After installing such three groups of structures respectively, multi-channel stirring is achieved, forming a cyclic structure that can be cleaned and stirred multiple times.

[0047] See also Figure 2 The clamping fixing seat 1-10 is fixed below the circular belt stirring paddle motor plate 1-1. The clamping fixing plate 1-10 is connected to the circular belt stirring paddle motor plate 1-10 by screws. A positioning pin is installed on the clamping fixing seat 1-10. When the stirring and mixing upper component 1 needs to be disassembled under special circumstances, there is no need to remove the clamping fixing seat 1-10 together, and there is no need to reposition it when reinstalling.

[0048] See also Figure 3 All parts on the stirring and mixing lower component 2 are related to the rotating arm base 2-1. The stirring and mixing lower component 2 also includes a rotating motor synchronous pulley 2-4, a rotating motor synchronous belt 2-5, a rotating driven wheel 2-7, a bearing sleeve 2-8, a rotating bearing 2-9, a cantilever pin 2-10, a flanged toothed idler wheel 2-11, a lifting motor synchronous belt 2-16, and a lifting motor synchronous pulley 2-17;

[0049] The middle part of the lifting motor synchronous pulley 2-17 is connected to the output end of the lifting motor 2-2, the cantilever pin 2-10 is fixedly connected to the rotating arm base 2-1, the cantilever pin 2-10 is axially connected to the flange toothed idler wheel 2-11, the lifting motor synchronous pulley 2-17 is connected to the flange toothed idler wheel 2-1 through the lifting motor synchronous belt 2-16, forming a lifting transmission structure, the lifting mechanical limit and lifting photoelectric switch are installed on the rotating arm base 2-1, and these parts are used to realize the lifting limit and the detection of the origin.

[0050] The bearing sleeve 2-8 has a rotating bearing 2-9 embedded inside, the rotating driven wheel 2-7 is mounted above the bearing sleeve 2-8, the middle of the rotating synchronous pulley 2-4 is connected to the output end of the rotating motor 2-3, the rotating synchronous pulley 2-4 is connected to the rotating driven wheel 2-7 through the rotating motor synchronous belt 2-5, forming a rotating transmission mechanism, and the rotating arm base 2-1 is also equipped with a rotating mechanical limit and a rotating photoelectric switch, and these parts are used to realize an action of rotating limit and detecting the origin.

[0051] See also Figure 3 The rotating arm base is provided with a bearing seat 2-8, a synchronous belt connecting plate 2-13, a linear bearing 2-14 and a guide shaft 2-15;

[0052] The middle part of the spline shaft 2-6 is sleeved and fixed on the rotating driven wheel 2-7, and the lower end of the spline shaft 2-6 is sleeved and fixed on the bearing seat 2-12;

[0053] A linear bearing 2-14 is installed on the guiding shaft 2-15. The bearing block 2-12 is connected to the guiding shaft 2-15 through the linear bearing 2-14. The guiding shaft 2-15 is parallel to the spline shaft 2-6. The bearing block 2-12 and the linear bearing 2-14 can move vertically along the guiding shaft 2-15. The spline shaft 2-6 can move and be limited vertically through the guiding shaft 2-15, preventing the spline shaft 2-6 from wobbling in the circumferential direction. At the same time, the cost of using the guiding shaft 2-15 is relatively low and the precision is relatively high.

[0054] The synchronous belt connecting plate 2-13 is fixedly connected to the bearing block 2-12. The synchronous belt connecting plate 2-13 is clamped and fixed on the lifting motor synchronous belt 2-16. When the lifting motor synchronous belt 2-16 rotates, it drives the bearing block 2-12 and the spline shaft 2-6 to move up and down together.

[0055] Please refer to Figure 1 , the upper end of the spline shaft 2-6 is connected to the clamping and fixing seat 1-10, and finally the upper component 1 of the stirring and mixing realizes the reciprocating circular rotation and lifting actions.

[0056] It should be noted here that the "variable-speed direct-current brush motor" adopted in this embodiment is specifically the Faulhaber motor 1717T024SR, and the number is 6. The different rotation speeds of the stirring paddle are realized by adjusting the voltage of the variable-speed direct-current brush motor; the model of the "board card" connected to the variable-speed direct-current brush motor is FD-2000-MC-1.0.

[0057] The "lifting mechanical limit" and "rotating mechanical limit" adopted in this embodiment are hard limits, and the number of each is 1; the models of the "lifting photoelectric switch" and "rotating photoelectric switch" are PM-F25, and the number of each is 1.

[0058] Embodiment 2

[0059] This embodiment provides a fully automatic biochemical analyzer, including the variable-speed stirring and mixing device in Embodiment 1.

[0060] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the present invention. Those who are familiar with the technology in this field can obviously make various modifications to these embodiments easily, and apply the general principles described here to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A variable speed stirring and mixing device, characterized in that: It comprises an upper stirring and mixing component (1) and a lower stirring and mixing component (2); The stirring and mixing upper component (1) comprises a circular belt (1-2), a plurality of variable speed DC brush motors (1-3), a plurality of stirring paddles (1-7), and a plurality of stirring paddle circular belt pulleys (1-9); the output end of the variable speed DC brush motor (1-3) is connected to the stirring paddle circular belt pulley (1-9) through a circular belt (1-2), and the stirring paddle circular belt pulley (1-9) is connected to the stirring paddle (1-7); The stirring and mixing lower component (2) comprises a rotating arm base (2-1) and a spline shaft (2-6) connected to each other, and a lifting motor (2-2) and a rotating motor (2-3) fixedly connected to the rotating arm base (2-1); the stirring and mixing upper component (1) and the rotating arm base (2-1) are connected via the spline shaft (2-6); the lifting motor (2-2) can achieve vertical movement of the stirring and mixing upper component (1) by driving the spline shaft (2-6) to rise and fall; and the rotating motor (2-3) can achieve rotation of the stirring and mixing upper component (1) by driving the spline shaft (2-6) to rotate.

2. A variable speed stirring and mixing device according to claim 1, characterized in that: The stirring and mixing upper component (1) also includes a circular belt stirring paddle motor plate (1-1), a motor circular belt pulley (1-4), a dual motor fixing seat (1-5), a stirring belt pulley fixing seat (1-6), a stirring paddle circular belt pulley bearing (1-8), a clamping fixing seat (1-10), and a stirring paddle support column (1-11); The circular belt stirring paddle motor plate (1-1) is provided with a plurality of dual motor fixing seats (1-5) and a plurality of stirring belt wheel fixing seats (1-6); the variable speed direct current brushed motor (1-3) is arranged on the dual motor fixing seat (1-5); and the stirring paddle (1-7) is connected to the stirring belt wheel fixing seat (1-6).

3. A variable speed stirring and mixing device according to claim 2, characterized in that: The clamping and fixing seat (1-10) is fixed below the round belt stirring paddle motor plate (1-1), and the clamping and fixing seat (1-10) and the round belt stirring paddle motor plate (1-1) are connected via fasteners.

4. A variable speed stirring and mixing device according to claim 1, characterized in that: The stirring and mixing lower component (2) also includes a rotating motor synchronous pulley (2-4), a rotating motor synchronous belt (2-5), a rotating driven wheel (2-7), a bearing sleeve (2-8), a rotating bearing (2-9), a cantilever pin (2-10), a flanged toothed idler wheel (2-11), a lifting motor synchronous belt (2-16), and a lifting motor synchronous pulley (2-17); The middle part of the lifting motor synchronous pulley (2-17) is connected to the output end of the lifting motor (2-2), the cantilever pin (2-10) and the rotating arm base (2-1) are fixedly connected, the cantilever pin (2-10) is axially connected to the flanged toothed idler wheel (2-11), and the lifting motor synchronous pulley (2-17) is transmission-connected to the flanged toothed idler wheel (2-11) via the lifting motor synchronous belt (2-16); The bearing sleeve (2-8) has a rotating bearing (2-9) embedded therein, the rotating driven wheel (2-7) is mounted above the bearing sleeve (2-8), the middle portion of the rotating motor synchronous pulley (2-4) is connected to the output end of the rotating motor (2-3), and the rotating motor synchronous pulley (2-4) is transmission-connected to the rotating driven wheel (2-7) via a rotating motor synchronous belt (2-5).

5. A variable speed stirring and mixing device according to claim 1 or 4, characterized in that: A bearing seat (2-12), a synchronous belt connecting plate (2-13), a linear bearing (2-14) and a guide shaft (2-15) are installed on the rotating arm base (2-1); The middle part of the spline shaft (2-6) is sleeved and fixed on the rotating driven wheel (2-7), the lower end of the spline shaft (2-6) is sleeved and fixed on the bearing seat (2-12), and the upper end of the spline shaft (2-6) is connected to the clamping fixing seat (1-10); A linear bearing (2-14) is installed on the guide shaft (2-15), the bearing seat (2-12) is connected to the guide shaft (2-15) via the linear bearing (2-14), the guide shaft (2-15) is parallel to the spline shaft (2-6), and the guide shaft (2-15) plays a role of vertical guidance for the spline shaft (2-6); The synchronous belt connecting plate (2-13) is fixedly connected to the bearing seat (2-12), and the synchronous belt connecting plate (2-13) is clamped and fixed on the lifting motor synchronous belt (2-16). When the lifting motor synchronous belt (2-16) rotates, it drives the bearing seat (2-12) and the spline shaft (2-6) to move up and down together.

6. A variable speed stirring and mixing device according to claim 1, characterized in that: The rotating arm base (2-1) is also equipped with a lifting mechanical limit and a lifting photoelectric switch for realizing an action of lifting limit and detecting the origin, and a rotating mechanical limit and a rotating photoelectric switch for realizing an action of rotating limit and detecting the origin.

7. A variable speed stirring and mixing device according to claim 1, characterized in that: The internal structure of the stirring paddle circular belt pulley (1-9) is a flat square hole.

8. A variable speed stirring and mixing device according to claim 1, characterized in that: The variable speed DC brushed motor (1-3) is provided with a board for individually controlling the speed of each motor.

9. A variable speed stirring and mixing device according to claim 1, characterized in that: The stirring paddle (1-7) has a spiral, L-shaped or flat straight structure.

10. A fully automatic biochemical analyzer, characterized in that: The invention comprises the variable speed stirring and mixing device according to any one of claims 1 to 9.

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