A small disposable magnetic suspension stirring liquid preparation system

Abstract

The invention relates to a small-sized disposable magnetic suspension stirring liquid preparation system applied to the field of material mixing. A flexible liquid preparation bag and a sealing ring and a sealing plate for sealing and fixing the open end of the liquid preparation bag are provided. During the magnetic stirring process, the sealing ring and the sealing plate are controlled to move up and down synchronously, so that the outer dimensions and height of the loose liquid preparation bag are automatically changed under the liquid pressure, thereby adjusting the filling flow space of the stock liquid in the liquid preparation bag. On the basis of magnetic stirring, the distance between the stock liquid and the magnetic rotor at different positions, as well as the stirring force and flow direction thereof are further changed, so as to effectively improve the mixing efficiency of the stock liquid. Combined with the setting of an auxiliary device, as the sealing plate moves up and down, the immersion depth of the auxiliary device in the stock liquid changes, and auxiliary stirring of the stock liquid at different height positions is realized through the auxiliary device, so as to further improve the mixing effect of the stock liquid.

Description

Technical Field

[0001] The invention relates to a magnetic suspension stirring liquid preparation system, in particular to a small disposable magnetic suspension stirring liquid preparation system applied to the field of material mixing. Background Art

[0002] Magnetic levitation stirring technology is a technology that uses the principle of magnetic force to achieve suspension stirring. It is mainly composed of magnets, rotors, sensors and control systems. Under the action of the magnetic field generated by the magnet, the magnet inside the rotor is attracted and suspended on the fixed magnet. By controlling the current changes in the control system, the position and speed of the rotor can be adjusted to achieve operations such as stirring, mixing and heating of the liquid. Compared with traditional mechanical stirrers, magnetic levitation stirrers do not need to directly contact the liquid, thus avoiding mechanical damage and pollution problems.

[0003] For example, the specification of Chinese patent CN202121656318.7 discloses a magnetic levitation stirring device for laboratory wastewater treatment. During the stirring process, there is no direct contact between the motor and the stirring rod, and there is no need to consider the sealing structure of the connection position. High heat will not occur during the stirring process, and it is convenient for staff to quickly clean after use; for example, the specification of Chinese patent CN202223444443.9 discloses a magnetic levitation stirring device, including a disposable liquid preparation bag, an isolation sleeve is provided on the inner wall of the disposable liquid preparation bag, and an outer magnet is provided on the outside of the disposable liquid preparation bag, and an inner magnet is provided in the middle of the isolation sleeve. Through the principle of magnetic induction, only the inner magnet of the bag needs to interact with the magnetic field, and the inner magnet of the bag is driven by the outer magnet of the bag to rotate to achieve suspension and stirring.

[0004] Existing small-scale magnetic levitation stirring devices generally place a container on the top of the stirring device, then put the rotor into the container, and start the device to stir the liquid in the container. However, the stirring force generated by the rotor on the liquid close to its own surface will be greater, and the rotor generally fits the bottom surface of the container. When the container is large and the liquid is large, it is difficult to fully and evenly mix the liquid relying solely on the vortex generated by the rotor, and the mixing efficiency is low. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that during the magnetic levitation stirring process, the stirring force of the rotor on the liquid at different positions in the container is different, resulting in poor mixing effect of the liquid.

[0006] In order to solve the above problems, the present invention provides a small disposable magnetic suspension stirring liquid preparation system, comprising a stirrer body and a magnetic rotor used in conjunction with each other, a sealing ring, a sealing plate and a liquid preparation bag are arranged on the upper side of the stirrer body, the magnetic rotor is placed inside the liquid preparation bag, the lower end of the liquid preparation bag is placed on the upper end of the stirrer body, and the upper open end of the liquid preparation bag is sandwiched between the sealing ring and the sealing plate;

[0007] The side ends of the sealing ring and the sealing plate are respectively fixedly connected with a pair of main cross bars and a pair of secondary cross bars, the upper end of the mixer body is fixedly connected with a plurality of side bars, the side ends of the side bars are provided with vertical slide grooves, the upper ends of the side bars are movably inserted with threaded rods extending into the vertical slide grooves, the inner bottom surfaces of the vertical slide grooves are fixedly connected with main compression springs, the main cross bars and the secondary cross bars respectively extend into different vertical slide grooves and are located between the threaded rods and the main compression springs;

[0008] A circular frame is provided on the upper side of the sealing plate, and the upper ends of multiple threaded rods all penetrate the circular frame and are connected to its internal threads. An inner groove is opened at the side end of the mixer body, and a side plate is fixedly connected to the side end of the circular frame. The side plate extends into the inner groove and is slidably connected to it, and a secondary compression spring is fixedly connected between the lower end of the side plate and the inner bottom surface of the inner groove.

[0009] As a further supplement to the present application, the liquid preparation bag includes a soft bag body, the open end of the soft bag body is fixedly connected to a sealed edge, the soft bag body is provided with a plurality of evenly distributed mesh holes near the sealed edge, and the inner bottom surface of the soft bag body is fixedly connected to a bottom plate.

[0010] As a further supplement to the present application, the sealing ring is located on the lower side of the sealing plate, and the upper end of the main cross bar and the lower end of the secondary cross bar are fixedly connected with positioning rods matching the mesh.

[0011] A small disposable magnetic suspension stirring liquid preparation system, the use method of which comprises the following steps:

[0012] S1, rotate the threaded rod on the upper side of the secondary crossbar to move it upward, and under the action of the elastic force of the main compression spring, push the sealing plate upward and away from the sealing ring;

[0013] S2, pass the liquid preparation bag from top to bottom through the sealing ring and place it on the upper end of the mixer body, and open the opening end of the liquid preparation bag and fix it on the upper end of the sealing ring;

[0014] S3, put the magnetic rotor into the liquid preparation bag, and then inject the various stock solutions to be prepared into the liquid preparation bag one by one, and then rotate the threaded rod on the upper side of the main cross bar, so that the sealing ring and the main cross bar move upward under the elastic force of the main compression spring until they are tightly fitted with the lower end of the sealing plate, effectively sealing the open end of the liquid preparation bag;

[0015] S4. Start the mixer body to make the magnetic rotor in the liquid preparation bag rotate rapidly to stir the stock solution. At the same time, manually press the circular frame repeatedly to drive multiple threaded rods to move up and down repeatedly, adjust the height position of the sealing ring and the sealing plate, so that the peripheral size and height of the liquid preparation bag are constantly changing, and then adjust the filling flow space of the stock solution in the liquid preparation bag, cooperate with the stirring process of the magnetic rotor, and effectively improve the mixing uniformity of the stock solution.

[0016] As another improvement of the present application, an auxiliary device is provided on the sealing plate, the auxiliary device includes an end head fixedly connected to the upper end of the sealing plate, the lower end of the end head is fixedly connected to a straight rod extending to the inside of the soft bag body, a rotating blade is provided on the lower side of the straight rod, the upper end of the rotating blade is fixedly connected to a ball rod, a ball groove is opened at the lower end of the straight rod, and the ball rod is rotatably connected to the inside of the ball groove.

[0017] As another improved supplement of the present application, the rotor blade is made of ferromagnetic material, and the maximum diameter of the ball groove is larger than the notch diameter of the ball groove.

[0018] As another improved supplement of the present application, the end head is an open structure with the opening facing upward, the upper end of the straight rod is provided with a liquid guide groove communicating with the inner side of the end head, and the inner wall of the liquid guide groove is provided with a plurality of liquid holes.

[0019] As another improvement supplement of the present application, in step S4, the vanes will rotate to a certain extent under the drive of the magnetic force of the magnetic rotor. At the same time, as the sealing plate moves up and down, the immersion depth of the vanes in the stock liquid changes. The vanes can be used to stir the stock liquid at different heights, further improving the mixing effect of the stock liquid.

[0020] As another improvement of the present application, a pair of sealing ropes are provided on the inner side of the sealing ring. The sealing rope includes a rope body with one end fixedly connected to the inner wall of the sealing ring, and the other end of the rope body movably passes through the inner wall of the sealing ring and is fixedly connected to the limiting head.

[0021] As another improvement supplement of the present application, a pair of limit heads are parallel to each other when in the straightened state, and the distance between the two is 1-3 cm.

[0022] To summarize, the present application provides a flexible liquid preparation bag, and a sealing ring and a sealing plate for sealing and fixing the open end of the liquid preparation bag. During the magnetic stirring process, the sealing ring and the sealing plate are controlled to move up and down synchronously, so that the outer dimensions and height of the relaxed liquid preparation bag automatically change under the liquid pressure, thereby adjusting the filling flow space of the stock liquid in the liquid preparation bag. On the basis of magnetic stirring, the distance between the stock liquid and the magnetic rotor at different positions, as well as the stirring force and flow direction thereof, are further changed, thereby effectively improving the mixing efficiency of the stock liquid. Combined with the setting of the auxiliary device, as the sealing plate moves up and down, the immersion depth of the auxiliary device in the stock liquid changes, and the auxiliary device is used to achieve auxiliary stirring of the stock liquid at different heights, thereby further improving the mixing effect of the stock liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The first embodiment of the present application is a three-dimensional Figure 1 ;

[0024] Figure 2 The first embodiment of the present application is a three-dimensional Figure 2 ;

[0025] Figure 3 The first embodiment of the present application is a three-dimensional Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the front structure of the first embodiment of this application. Figure 1 ;

[0027] Figure 5 This is a schematic diagram of the front structure of the first embodiment of this application. Figure 2 ;

[0028] Figure 6 This is a partial stereogram of the second embodiment of the present application;

[0029] Figure 7 This is a schematic diagram of the front structure of the second embodiment of this application Figure 1 ;

[0030] Figure 8 This is a schematic diagram of the front structure of the second embodiment of this application Figure 2 ;

[0031] Fig. 9 This is a three-dimensional diagram of the third embodiment of the present application;

[0032] Fig.10 This is a three-dimensional diagram of a sealing plate according to the third embodiment of the present application;

[0033] Fig.11 This is a three-dimensional diagram of the sealing rope of the third embodiment of the present application when in use;

[0034] Fig.12 This is a schematic diagram of the front structure of the sealing rope of the third embodiment of the present application when in use.

[0035] Description of the numbers in the figure:

[0036] 1 mixer body, 101 inner tank, 2 sealing ring, 201 main cross bar, 3 sealing plate, 301 secondary cross bar, 4 side bar, 401 vertical slide, 5 threaded rod, 6 main compression spring, 7 back frame, 701 side plate, 8 liquid bag, 81 soft bag body, 82 edge sealing, 83 mesh, 84 bottom plate, 9 positioning rod, 10 secondary compression spring, 11 auxiliary device, 1101 end, 1102 straight rod, 1103 rotor, 1104 ball rod, 1105 ball groove, 1106 liquid hole, 12 sealing rope, 1201 rope body, 1202 limit head. DETAILED DESCRIPTION

[0037] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0038] The first implementation method:

[0039] The present invention provides a small disposable magnetic suspension stirring liquid preparation system, please refer to Figure 1 and 2 The invention comprises a mixer body 1 and a magnetic rotor used in combination. The upper side of the mixer body 1 is provided with a sealing ring 2, a sealing plate 3 and a liquid preparation bag 8. The magnetic rotor is placed inside the liquid preparation bag 8. The lower end of the liquid preparation bag 8 is placed on the upper end of the mixer body 1. Figure 3 As shown, the upper open end of the liquid preparation bag 8 is sandwiched between the sealing ring 2 and the sealing plate 3.

[0040] See also Figure 1 and Figure 2 , the side ends of the sealing ring 2 and the sealing plate 3 are respectively fixedly connected with a pair of main cross bars 201 and a pair of secondary cross bars 301, and the upper end of the mixer body 1 is fixedly connected with a plurality of side bars 4, and the side ends of the side bars 4 are provided with vertical slide grooves 401, and the upper ends of the side bars 4 are movably inserted with threaded rods 5 extending into the vertical slide grooves 401, and the inner bottom surface of the vertical slide grooves 401 is fixedly connected with a main compression spring 6, the main cross bar 201 and the secondary cross bar 301 extend into different vertical slide grooves 401 respectively and are located between the threaded rod 5 and the main compression spring 6, the initial length of the main compression spring 6 is greater than the vertical length of the vertical slide groove 401, so that the main compression spring 6 is always in a compressed state, providing upward elastic force for the main cross bar 201 and the secondary cross bar 301, and a circular frame 7 is provided on the upper side of the sealing plate 3, and the upper ends of the plurality of threaded rods 5 all penetrate the circular frame 7 and are connected with its internal threads;

[0041] Under the elastic force of the main compression spring 6, the main cross bar 201 and the secondary cross bar 301 can be clamped between the corresponding threaded rod 5 and the main compression spring 6. At this time, by manually rotating the threaded rod 5 and adjusting the position of the threaded rod 5 in the vertical slide groove 401, the main cross bar 201 and the secondary cross bar 301 can be moved up and down accordingly with the threaded rod 5. After stopping rotation, through the threaded connection between the threaded rod 5 and the circular frame 7, the threaded rod 5 can smoothly overcome the elastic force of the main compression spring 6 and maintain stability, thereby achieving the stability of the sealing ring 2 and the sealing plate 3.

[0042] See also Figure 3 and Figure 4 An inner groove 101 is provided at the side end of the mixer body 1, and a side plate 701 is fixedly connected to the side end of the circular frame 7. The side plate 701 extends into the inner groove 101 and is slidably connected thereto. A secondary compression spring 10 is fixedly connected between the lower end of the side plate 701 and the inner bottom surface of the inner groove 101. The secondary compression spring 10 is also in a compressed state, providing an upward elastic force for the side plate 701. The secondary compression spring 10 and the side plate 701 can make the circular frame 7 in a stable height state in the initial state, thereby facilitating the positioning of the threaded rod 5, keeping the sealing ring 2 and the sealing plate 3 at a certain height, and facilitating the placement of the liquid bag 8.

[0043] See also Figure 3 and Figure 4 The liquid preparation bag 8 includes a soft bag body 81, an open end of the soft bag body 81 is fixedly connected to a sealing edge 82, a plurality of evenly distributed mesh holes 83 are provided near the sealing edge 82 of the soft bag body 81, and a bottom plate 84 is fixedly connected to the inner bottom surface of the soft bag body 81. Figure 3 and Figure 6 As shown, the sealing ring 2 is located at the lower side of the sealing plate 3, and the upper end of the main cross bar 201 and the lower end of the secondary cross bar 301 are fixedly connected with a positioning rod 9 matching the mesh 83. When installing the liquid bag 8, by inserting the positioning rod 9 on the main cross bar 201 into the mesh 83, a multi-point limiting effect on the open end of the soft bag body 81 can be achieved, so that the open end of the soft bag body 81 can be fixed on the upper end of the sealing ring 2 in an open state, which is convenient for injecting the raw liquid to be prepared into the soft bag body 81. When the sealing ring 2 and the sealing plate 3 are close to each other and fit together, the hand The sealing edge 82 is further opened so that the positioning rod 9 on the lower side of the secondary cross bar 301 is also inserted into the mesh 83, which can further fix the open end of the soft bag body 81 and facilitate the close fit between the sealing ring 2 and the sealing plate 3. The soft bag body 81 is clamped, and the bottom plate 84 is located at the center of the soft bag body 81, which is convenient for the placement and rotation of the magnetic rotor. The liquid preparation bag 8 is a disposable structure. After completing a single liquid preparation, the liquid preparation bag 8 can be removed to collect the liquid, and then a new liquid preparation bag 8 can be installed on the sealing plate 3 to prepare a new liquid.

[0044] A small disposable magnetic suspension stirring liquid preparation system, the use method of which comprises the following steps:

[0045] S1, such as Figure 3 As shown, the threaded rod 5 on the upper side of the secondary crossbar 301 is rotated to move it upward, and under the elastic force of the main compression spring 6, the sealing plate 3 is pushed to move upward away from the sealing ring 2;

[0046] S2, pass the liquid bag 8 from top to bottom through the sealing ring 2 and place it on the upper end of the mixer body 1, and make the opening end of the liquid bag 8 open and fixed on the upper end of the sealing ring 2;

[0047] S3, put the magnetic rotor into the liquid preparation bag 8, and then inject the various stock solutions to be prepared into the liquid preparation bag 8 one by one, and then rotate the threaded rod 5 on the upper side of the main cross bar 201, so that the sealing ring 2 and the main cross bar 201 move upward under the elastic force of the main compression spring 6 until they are tightly fitted with the lower end of the sealing plate 3, and the open end of the liquid preparation bag 8 is effectively sealed. Figure 4 As shown;

[0048] S4, start the mixer body 1, make the magnetic rotor in the liquid bag 8 rotate rapidly, stir the stock solution, at the same time, Figure 5As shown, the circular frame 7 is pressed repeatedly manually to drive the multiple threaded rods 5 to move up and down repeatedly, and the height positions of the sealing ring 2 and the sealing plate 3 are adjusted, so that the peripheral size and height of the liquid preparation bag 8 are continuously changed, thereby adjusting the filling flow space of the raw liquid in the liquid preparation bag 8, cooperating with the stirring process of the magnetic rotor, and effectively improving the mixing uniformity of the raw liquid.

[0049] During the downward movement of the threaded rod 5, the threaded rod 5 presses down the main crossbar 201 and the secondary crossbar 301, so that the sealing ring 2 and the sealing plate 3 drive the open end of the liquid bag 8 to move downward. Under the pressure of the stock liquid, the outer circumference of the liquid bag 8 expands outward, the height decreases, the liquid level of the stock liquid decreases, and the outer diameter increases. Conversely, when the circular frame 7 is released, under the action of the main compression spring 6, the sealing ring 2 and the sealing plate 3 drive the open end of the liquid bag 8 to move upward, so that the outer circumference of the liquid bag 8 shrinks, the liquid level of the stock liquid inside it increases, and the outer diameter decreases.

[0050] Therefore, by changing the relaxed state of the liquid preparation bag 8, the shape of the bag is automatically changed under the liquid pressure, and the filling state of the original liquid inside it also changes accordingly. On the basis of magnetic stirring, the distance between the original liquid at different positions and the magnetic rotor, as well as the stirring force and flow direction are further changed, thereby effectively improving the mixing efficiency of the original liquid.

[0051] Second implementation method:

[0052] This implementation mode adds the following contents based on implementation mode 1: Figure 6 and Figure 7 An auxiliary device 11 is provided on the sealing plate 3, and the auxiliary device 11 includes an end head 1101 fixedly connected to the upper end of the sealing plate 3, and a straight rod 1102 extending to the inside of the soft bag body 81 is fixedly connected to the lower end of the end head 1101, and a rotating blade 1103 is provided on the lower side of the straight rod 1102, and a ball rod 1104 is fixedly connected to the upper end of the rotating blade 1103, and a ball groove 1105 is opened at the lower end of the straight rod 1102, and the ball rod 1104 is rotatably connected to the inside of the ball groove 1105, and the rotating blade 1103 is made of ferromagnetic material, and the maximum diameter of the ball groove 1105 is larger than the notch diameter of the ball groove 1105.

[0053] Through the arrangement of the above-mentioned structure, when the sealing ring 2 and the sealing plate 3 gradually fit together, the auxiliary device 11 will be immersed in the internal stock solution through the opening of the soft bag body 81. In step S4, while performing magnetic stirring, the rotor 1103 will rotate to a certain extent with the magnetic rotor under the drive of the magnetic force. At the same time, as the sealing plate 3 moves up and down, the immersion depth of the rotor 1103 in the stock solution changes. The rotor 1103 can be used to auxiliaryly stir the stock solution at different heights, thereby further improving the mixing effect of the stock solution.

[0054] See also Figure 8The end 1101 is an open structure with the opening facing upward, and a liquid guide groove communicating with the inner side of the end 1101 is provided at the upper end of the straight rod 1102. A plurality of liquid holes 1106 are provided on the inner wall of the liquid guide groove and are located on the lower side of the sealing ring 2. Through the arrangement of the above structure, during the stirring process, when other liquids need to be added, the sealing ring 2 and the sealing plate 3 do not need to be separated, and the liquid can be slowly injected into the end 1101, and then through the liquid guide groove and the liquid hole 1106, the liquid can smoothly flow into the soft bag body 81 and mix with the original liquid, thereby further improving the convenience of use of the present application.

[0055] The third implementation method:

[0056] This implementation mode adds the following contents based on the implementation mode 2: Fig. 9 and Fig.10 A pair of sealing ropes 12 are provided on the inner side of the sealing ring 2. The sealing rope 12 includes a rope body 1201 with one end fixedly connected to the inner wall of the sealing ring 2. The other end of the rope body 1201 movably passes through the inner wall of the sealing ring 2 and is fixedly connected to a limiting head 1202. The pair of limiting heads 1202 are parallel to each other when straightened, and the distance between the two is 1-3 cm.

[0057] Before installing the liquid bag 8, the rope body 1201 inside the sealing ring 2 is Fig.10 The loose state shown in FIG. 1 is convenient for passing the liquid bag 8 through a pair of rope bodies 1201 when installing the liquid bag 8. Fig.11 and Fig.12 When the sealing ring 2 and the sealing plate 3 are tightly fitted, the rope body 1201 can be pulled outward so that the rope body 1201 can further seal the soft bag body 81, so that the original liquid in the stirring process is not easy to splash to the lower surface of the sealing plate 3, which not only reduces the pollution to the sealing plate 3, but also reduces the concentration error of the mixed liquid.

[0058] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A small disposable magnetic suspension stirring liquid preparation system, comprising a stirring machine body (1) and a magnetic rotor for use together, characterized in that: A sealing ring (2), a sealing plate (3) and a liquid preparation bag (8) are provided on the upper side of the mixer body (1); the magnetic rotor is placed inside the liquid preparation bag (8); the lower end of the liquid preparation bag (8) is placed on the upper end of the mixer body (1); and the upper open end of the liquid preparation bag (8) is sandwiched between the sealing ring (2) and the sealing plate (3); The side ends of the sealing ring (2) and the sealing plate (3) are respectively fixedly connected to a pair of main cross bars (201) and a pair of secondary cross bars (301); the upper end of the mixer body (1) is fixedly connected to a plurality of side bars (4); the side ends of the side bars (4) are provided with vertical slide grooves (401); the upper ends of the side bars (4) are movably inserted with threaded rods (5) extending into the interior of the vertical slide grooves (401); the inner bottom surfaces of the vertical slide grooves (401) are fixedly connected to main compression springs (6); the main cross bars (201) and the secondary cross bars (301) respectively extend into different vertical slide grooves (401) and are located between the threaded rods (5) and the main compression springs (6); A circular frame (7) is provided on the upper side of the sealing plate (3); the upper ends of the plurality of threaded rods (5) all penetrate the circular frame (7) and are connected to the inner thread thereof; an inner groove (101) is provided on the side end of the mixer body (1); a side plate (701) is fixedly connected to the side end of the circular frame (7); the side plate (701) extends into the inner groove (101) and is slidably connected thereto; and a secondary compression spring (10) is fixedly connected between the lower end of the side plate (701) and the inner bottom surface of the inner groove (101); The liquid preparation bag (8) comprises a soft bag body (81), the open end of the soft bag body (81) is fixedly connected to a sealing edge (82), a plurality of evenly distributed mesh holes (83) are provided in the soft bag body (81) near the sealing edge (82), the inner bottom surface of the soft bag body (81) is fixedly connected to a bottom plate (84), the sealing ring (2) is located at the lower side of the sealing plate (3), and the upper end of the main cross bar (201) and the lower end of the secondary cross bar (301) are both fixedly connected to positioning rods (9) matching the mesh holes (83).

2. A small disposable magnetic suspension stirring liquid preparation system according to claim 1, characterized in that: The method of use includes the following steps: S1, rotating the threaded rod (5) on the upper side of the secondary crossbar (301) to move it upward, and under the elastic force of the main compression spring (6), pushing the sealing plate (3) to move upward away from the sealing ring (2); S2, passing the liquid preparation bag (8) from top to bottom through the sealing ring (2) and placing it on the upper end of the mixer body (1), and leaving the opening end of the liquid preparation bag (8) open and fixed on the upper end of the sealing ring (2); S3, placing a magnetic rotor into the liquid preparation bag (8), and then injecting the various stock solutions to be prepared into the liquid preparation bag (8) one by one, and then rotating the threaded rod (5) on the upper side of the main cross bar (201), so that the sealing ring (2) and the main cross bar (201) move upward under the elastic force of the main compression spring (6) until they are tightly fitted with the lower end of the sealing plate (3), thereby effectively sealing the open end of the liquid preparation bag (8); S4, start the mixer body (1) to make the magnetic rotor in the liquid preparation bag (8) rotate rapidly to stir the stock solution. At the same time, manually press the circular frame (7) repeatedly to drive the multiple threaded rods (5) to move up and down repeatedly, adjust the height position of the sealing ring (2) and the sealing plate (3), so that the peripheral size and height of the liquid preparation bag (8) are constantly changed, thereby adjusting the filling flow space of the stock solution in the liquid preparation bag (8), cooperating with the stirring process of the magnetic rotor, and effectively improving the mixing uniformity of the stock solution.

3. A small disposable magnetic suspension stirring liquid preparation system according to claim 2, characterized in that: The sealing plate (3) is provided with an auxiliary device (11), the auxiliary device (11) comprising an end head (1101) fixedly connected to the upper end of the sealing plate (3), the lower end of the end head (1101) being fixedly connected to a straight rod (1102) extending into the interior of the soft bag body (81), a rotating blade (1103) being provided on the lower side of the straight rod (1102), the upper end of the rotating blade (1103) being fixedly connected to a ball rod (1104), a ball groove (1105) being provided at the lower end of the straight rod (1102), and the ball rod (1104) being rotatably connected to the interior of the ball groove (1105).

4. A small disposable magnetic suspension stirring liquid preparation system according to claim 3, characterized in that: The rotating blade (1103) is made of ferromagnetic material, and the maximum diameter of the ball groove (1105) is greater than the notch diameter of the ball groove (1105).

5. A small disposable magnetic suspension stirring liquid preparation system according to claim 3, characterized in that: The end head (1101) is an open structure with its opening facing upwards, and the upper end of the straight rod (1102) is provided with a liquid conducting groove which communicates with the inner side of the end head (1101), and the inner wall of the liquid conducting groove is provided with a plurality of liquid holes (1106).

6. A small disposable magnetic suspension stirring liquid preparation system according to claim 3, characterized in that: In step S4, the rotating blade (1103) is driven by the magnetic force of the magnetic rotor and rotates to a certain extent. At the same time, as the sealing plate (3) moves up and down, the immersion depth of the rotating blade (1103) in the stock solution changes. The rotating blade (1103) can stir the stock solution at different heights, further improving the mixing effect of the stock solution.

7. A small disposable magnetic suspension stirring liquid preparation system according to claim 1, characterized in that: A pair of sealing ropes (12) are provided on the inner side of the sealing ring (2), the sealing rope (12) comprising a rope body (1201) with one end fixedly connected to the inner wall of the sealing ring (2), and the other end of the rope body (1201) movably passing through the inner wall of the sealing ring (2) and fixedly connected to a limiting head (1202).

8. A small disposable magnetic suspension stirring liquid preparation system according to claim 7, characterized in that: The pair of limit heads (1202) are parallel to each other when in a straightened state, and the distance between the two is 1-3 cm.

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