A magnetic force-based flow phase preparation device

Abstract

The application discloses a magnetic force-based mobile phase preparation device and relates to the technical field of mobile phase preparation.The device comprises a control case seat, a mounting mechanism arranged on the upper side of the control case seat, a solution cup, a solution inlet pipe, a stirring paddle, an inclined magnetic strip, a solution inner hole, a liquid discharge hole, a plugging piece and a magnetic field of an electromagnet.The solution cup is mounted on the mounting mechanism, the lower end of the solution cup is connected with the solution inlet pipe, the stirring paddle is rotatably mounted at the lower end of the solution inlet pipe, the stirring paddle comprises the inclined magnetic strip, the stirring paddle is provided with the solution inner hole and the liquid discharge hole which is in communication with the solution inner hole, the plugging piece is arranged in the liquid discharge hole, and the magnetic attraction of the inclined magnetic strip can attract and seal the solution inner hole upward by the plugging piece.The magnetic field of the electromagnet is adjusted to control the downward movement of the plugging piece, so that the automatic addition of a PH value adjusting solution is realized, and the PH value of the mobile phase is precisely adjusted by cooperating with a flowmeter and a PH meter, thereby achieving the purpose of automatically and precisely configuring the mobile phase, and saving manpower and configuration time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mobile phase preparation, in particular to a mobile phase preparation device based on magnetic force. BACKGROUND

[0002] In the preparation of related solutions, a preparation device needs to be used, and at the same time, in order to ensure the uniformity of the preparation, a stirring device is needed to stir the mixed liquid. For example, mobile phase is used in the detection of high performance liquid chromatography or liquid chromatography-mass spectrometry to separate and elute the measured components. There are mainly two kinds of mobile phase configurations. One is to configure a certain solution with ultrapure water, such as 0.5% hydrochloric acid solution, which only needs to be mixed and ultrasonically degassed. The second is to adjust the pH value of the mobile phase, such as 0.5% triethylamine solution (the pH value is adjusted to 4.5 with phosphoric acid), which needs to adjust the pH value of the mobile phase to the pH value 4.5 specified in the quality standard.

[0003] Especially in the configuration of the mobile phase whose pH value needs to be adjusted, the current method is to manually add the solution for adjusting the pH value (also known as "pH adjusting solution") and use a pH meter to measure the pH value of the mobile phase to determine whether it reaches the pH value specified in the quality standard. The disadvantage is that each time the solution for adjusting the pH value is added, it needs to be shaken and mixed, and then the pH meter is used to measure the pH value of the mobile phase. If the pH value of the mobile phase does not reach the value specified in the quality standard, the solution for adjusting the pH value needs to be added again and shaken and mixed, and then the pH meter is used to measure the current pH value of the mobile phase. This operation needs to be repeated many times, and after each measurement, the electrode of the pH meter needs to be cleaned and dried before the next measurement. Many times, it takes a whole morning to configure the mobile phase with the pH value specified in the quality standard. More seriously, if the solution for adjusting the pH value is added too much and exceeds the standard specified pH value (for example, the standard specifies that the pH value of the mobile phase is adjusted to 4.5, and by mistake, it is adjusted from 4.4 to 4.6), the mobile phase needs to be reconfigured to adjust the pH value again.

[0004] In summary, it is difficult to manually prepare the mobile phase and adjust the pH value of the mobile phase by hand, and it is not easy to control the amount of the solution for adjusting the pH value of the acid or base. This affects the efficiency and the probability of rework is high. In addition, because some containers for loading liquid are narrow-mouth bottles, in order to put the stirring tool (such as a stirring paddle) into the narrow-mouth bottle, the transverse size of such stirring paddle should be smaller than the diameter of the bottle opening, which results in a shorter size of the stirring paddle, affecting the stirring effect. SUMMARY

[0005] The application aims to provide a flow phase preparation device based on magnetic force, solve the problem that it is difficult to manually prepare and the amount of PH value adjusting solution of acid or alkali is not easy to control, and the transverse size of stirring paddle is limited by the size of narrow-mouth bottle.

[0006] The application solves the above technical problems by the following technical scheme, and provides a flow phase preparation device based on magnetic force, which comprises:

[0007] A control case seat;

[0008] An installation mechanism arranged on the upper side of the control case seat;

[0009] A solution cup installed on the installation mechanism, and a liquid delivery pipe communicated and fixed to the lower end of the solution cup;

[0010] A stirring paddle rotatably installed at the lower end of the liquid delivery pipe, wherein the stirring paddle comprises an inclined magnetic strip, a liquid delivery hole and a liquid discharge hole communicated with the liquid delivery hole are arranged in the stirring paddle, a plugging piece is arranged in the liquid discharge hole, and the magnetic attraction force of the inclined magnetic strip upwardly attracts and seals the liquid delivery hole;

[0011] A PH meter for monitoring the PH value of the solution and feeding back to the control case seat;

[0012] A magnetic drive mechanism arranged in the control case seat, wherein the magnetic drive mechanism comprises an electromagnet horizontally rotating, the inclined magnetic strip is magnetically coupled with the electromagnet and synchronously rotates with the electromagnet, and the inclined magnetic strip stirs the liquid in the narrow-mouth bottle when rotating; meanwhile, when the magnetic field of the electromagnet is adjusted to a predetermined intensity, the plugging piece is attracted and downwardly moved, so that the liquid delivery hole discharges the solution, and the control case seat controls the time of the electromagnet enhancing the magnetic field according to the solution flow rate fed back by the PH meter.

[0013] Preferably, the stirring paddle further comprises a rotating block rotatably installed on the liquid delivery pipe, two inclined magnetic strips are fixed to the lower side of the rotating block, the liquid delivery hole is arranged in the rotating block and the inclined magnetic strips, a transverse block is fixed to the lower end of the inclined magnetic strip, and the liquid discharge hole is arranged in the transverse block.

[0014] Preferably, the plugging piece comprises an iron traction block vertically and slidably arranged in the liquid discharge hole, the diameter of the iron traction block is smaller than that of the liquid discharge hole, a rubber block is fixed to the upper end of the iron traction block, an inner tapered portion is arranged at the upper end of the liquid discharge hole, the upper end of the rubber block is provided with a circular truncated cone with a slope suitable for the slope of the inner tapered portion, and when the plugging piece is moved to the inner tapered portion due to the magnetic attraction of the inclined magnetic strip, the plugging piece blocks the inner tapered portion; when the magnetic field of the electromagnet is adjusted to a predetermined intensity, the plugging piece is attracted and downwardly moved out of the inner tapered portion, and the solution is discharged through the liquid discharge hole.

[0015] Preferably, a guide rod is fixed inside the drain hole by a crossbar, and a guide hole adapted to the guide rod is opened on the lower side of the iron traction block, and the guide rod extends into the guide hole.

[0016] Preferably, the mounting mechanism includes a vertical rod fixed to the upper side of the control box base, a sliding sleeve slidably disposed on the vertical rod, a mounting plate fixed to the sliding sleeve by a connecting rod, and a bolt screwed onto the sliding sleeve. When the bolt is loosened, the height of the mounting plate can be adjusted by vertically sliding the sliding sleeve.

[0017] Preferably, a rod-shaped heater is installed on the mounting mechanism, the heating rod of the rod-shaped heater extends downward, and a temperature sensor is installed on the infusion tube to monitor the temperature inside the narrow-mouth bottle and feed back to the control box base.

[0018] Preferably, the magnetic drive mechanism further includes a power component, which includes a vertical rotating rod rotatably mounted on the bottom of the control box base. A turntable is fixed to the upper end of the vertical rotating rod, two sets of electromagnets are fixed to the upper surface of the turntable, an external gear ring is fixed to the lower end of the turntable, a motor is fixed to the bottom of the control box base, and a gear that meshes with the external gear ring is fixed to the output end of the motor.

[0019] An electric slip ring is provided on the outer side of the vertical rotating rod to transmit power to the electromagnet.

[0020] Preferably, the upper surface of the control box base is provided with a boss housing, and the two electromagnets are located inside the boss housing.

[0021] Preferably, the outer end of the transverse block is vertically rotated and fitted with a rotating magnetic strip, and the magnetic poles of the inclined magnetic strip and the rotating magnetic strip are opposite at their closest points. When no other force is applied, the rotating magnetic strip will rotate inward due to the magnetic attraction between the rotating magnetic strip and the inclined magnetic strip. When the magnetic field of the electromagnet increases to a predetermined value, the rotating magnetic strip is attracted by the magnetic field of the electromagnet and rotates outward, thus expanding the width of the stirring paddle.

[0022] Preferably, the horizontal block and the flip magnetic strip are connected by a limiting member. The limiting member includes a rotating shaft fixed to the flip magnetic strip. The rotating shaft is rotatably connected to the horizontal block. The horizontal block has an arc-shaped groove centered on the rotating shaft. The rotating shaft is fixed with a limiting block by a connecting rod. The limiting block extends into the arc-shaped groove.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. By increasing the magnetic field of the electromagnet, the blockage component is controlled to move downward, thereby automatically adding pH adjustment solution. In conjunction with the flow meter and pH meter, the pH value of the mobile phase is precisely adjusted, which not only saves manpower but also saves preparation time, achieving the purpose of automatic and precise preparation of the mobile phase.

[0025] 2. When not in use, the stirring paddle formed by the combination of the inclined magnetic strip and the flipping magnetic strip retracts inward, reducing the lateral size of the stirring paddle, allowing it to enter or be removed from the narrow-mouth bottle. When the stirring paddle enters the bottom of the narrow-mouth bottle, the flipping magnetic strip flips outward due to the magnetic field of the electromagnet, expanding the lateral size of the stirring paddle, thereby increasing the stirring area of ​​the liquid in the narrow-mouth bottle and improving the stirring effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the front sectional view of the narrow-mouthed bottle in this invention;

[0028] Figure 3 This is a three-dimensional structural diagram of the stirring paddle in this invention;

[0029] Figure 4 This is a schematic diagram of the main structure of the stirring paddle in this invention;

[0030] Figure 5 This is a schematic diagram of the magnetic drive mechanism in this invention;

[0031] Figure 6 for Figure 4 Enlarged structural diagram at point A in the middle.

[0032] The numbers in the image represent:

[0033] 1-Control chassis base; 2-Mounting mechanism; 21-Vertical rod; 22-Sliding sleeve; 23-Bolt; 24-Mounting plate; 3-Boss housing; 4-Narrow-mouth bottle; 5-Rod heater; 51-Heating rod; 6-Solution cup; 61-Infusion tube; 62-Flow meter; 7-Stirring paddle; 71-Rotating block; 72-Inclined magnetic strip; 73-Horizontal block; 74-Flipping magnetic strip; 75-Infusion inner hole; 76-Angle limiting component; 761-Rotating shaft; 762-Arc groove; 763-Restricting block; 77-Drain hole; 78-Blocking component; 781-Iron traction block; 782-Rubber block; 79-Guide rod; 8-Magnetic drive mechanism; 81-Vertical rotating rod; 82-Turntable; 83-External gear ring; 84-Motor; 85-Gear; 86-Electromagnet; 9-Temperature sensor; 10-pH meter; 11-Electric slip ring. Detailed Implementation

[0034] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] This embodiment provides a technical solution: a magnetically based mobile phase preparation device, such as... Figures 1-5 As shown, it includes: a control housing 1, a mounting mechanism 2, a solution cup 6, a stirring paddle 7, a pH meter 10, and a magnetic drive mechanism 8; the control housing 1 has a control system for controlling the operation of the entire device and a control panel for operation.

[0037] The mounting mechanism 2 is located on the upper side of the control box base 1 and is used to fix the solution cup 6 and adjust its height. The mounting mechanism 2 includes a vertical rod 21 fixed on the upper side of the control box base 1. A sliding sleeve 22 is slidably mounted on the vertical rod 21. The sliding sleeve 22 is fixed to the mounting plate 24 through a connecting rod. The solution cup 6 is mounted on the mounting plate 24. In order to ensure that the position of the solution cup 6 will not shift when sliding vertically, the vertical rod 21 and the sliding sleeve 22 cannot be rotated horizontally. A bolt 23 is screwed onto the sliding sleeve 22. When the bolt 23 is loosened, the height of the solution cup 6 can be adjusted by sliding the sliding sleeve 22 vertically. When the bolt 23 is tightened, the sliding sleeve 22 can be locked and fixed on the vertical rod 21.

[0038] The solution cup 6 can be filled with the solution (also known as "pH adjusting solution") needed to adjust the pH value to acidity or alkalinity. Depending on the required solution, a suitable solution can be added; for example, to prepare a 0.5% acetic acid solution, the solution cup 6 will contain an acetic acid solution of a certain concentration. An infusion tube 61 is fixedly connected to the lower end of the solution cup 6, which can be used to transfer the pH adjusting solution within the solution cup 6. A flow meter 62 is installed on the infusion tube 61 to monitor the flow rate, and a valve can also be installed to control the flow of the pH adjusting solution within the solution cup 6.

[0039] The stirring paddle 7 is installed at the lower end of the infusion tube 61. The stirring paddle 7 includes a rotating block 71 that is rotatably installed on the infusion tube 61, and the connection between the two is water-sealed. Two inclined magnetic strips 72 are fixed on the lower side of the rotating block 71. The lower ends of the inclined magnetic strips 72 are inclined outward. When the stirring paddle 7 rotates, it mixes and stirs the solution in the narrow-mouth bottle 4.

[0040] The rotating block 71 and the inclined magnetic strip 72 are both provided with an infusion inner hole 75. The lower end of the inclined magnetic strip 72 is fixed with a horizontal block 73. The horizontal block 73 is provided with a drain hole 77 that communicates with the infusion inner hole 75. The inner diameter of the drain hole 77 is larger than the inner diameter of the infusion inner hole 75. A plug 78 is provided in the drain hole 77. Without the influence of other external forces, the magnetic attraction of the inclined magnetic strip 72 will attract the plug 78 upward to seal the infusion inner hole 75, thereby ensuring that the pH adjustment solution in the infusion inner hole 75 will not flow down.

[0041] Specifically, the blocking component 78 includes an iron traction block 781 that is vertically slidably disposed within the drain hole 77. The diameter of the iron traction block 781 is smaller than the diameter of the drain hole 77, providing space for the pH adjustment solution to flow down. A rubber block 782 is fixed to the upper end of the iron traction block 781. An inner cone is provided at the upper end of the drain hole 77. A frustum adapted to the slope of the inner cone is provided at the upper end of the rubber block 782, so that the rubber block 782 fits tightly with the inner cone. When the blocking component 78 moves to the inner cone due to the magnetic attraction of the inclined magnetic strip 72, the blocking component 78 blocks the inner cone, achieving the effect of sealing the pH adjustment solution.

[0042] pH meter 10 is used to monitor the pH value in the solution and feed it back to the control system of control chassis 1;

[0043] The magnetic drive mechanism 8 is located inside the control housing 1. The magnetic drive mechanism 8 includes two horizontally rotating electromagnets 86. When the stirring paddle 7 enters the set position at the bottom of the narrow-mouth bottle 4, the two inclined magnetic strips 72 are magnetically coupled to the two electromagnets 86 respectively. If the position of the inclined magnetic strips 72 does not correspond to the position of the electromagnets 86, the magnetic field of the electromagnets 86 will automatically capture the inclined magnetic strips 72 when the electromagnets 86 rotate. The two inclined magnetic strips 72 rotate synchronously with the two electromagnets 86. When the two inclined magnetic strips 72 rotate, they stir the liquid in the narrow-mouth bottle 4.

[0044] Simultaneously, when the magnetic field of electromagnet 86 is adjusted to the predetermined intensity, the iron traction block 781 is attracted by the magnetic field of electromagnet 86, and this attraction is greater than the attraction of the inclined magnetic strip 72. The blocking part 78 is adsorbed and moves downward, and the pH adjustment solution is discharged through the infusion inner hole 75 and added into the narrow-mouth bottle 4. When the appropriate flow rate is reached, the magnetic field of electromagnet 86 is reduced, and the force of the magnetic field of electromagnet 86 on the blocking part 78 is reduced. The blocking part 78 moves upward due to the attraction of the magnetic field of the inclined magnetic strip 72, thereby blocking the infusion inner hole 75.

[0045] When designing the product, the magnetic force of the inclined magnetic strip 72 coupled to the electromagnet 86 is less than the magnetic force of the electromagnet 86 to attract the blockage 78 downwards. This prevents the blockage 78 from being attracted downwards at any time. At the same time, because the blockage 78 will be subjected to a large centrifugal force when the inclined magnetic strip 72 rotates at high speed, it is difficult for the electromagnet 86 to attract the blockage 78 downwards. When adding pH adjustment solution, the rotation speed of the electromagnet 86 needs to be reduced to a set threshold to reduce the centrifugal force of the blockage 78, so that the blockage 78 can be successfully attracted downwards.

[0046] A guide rod 79 is fixed inside the drain hole 77 by a crossbar. A guide hole adapted to the guide rod 79 is opened on the lower side of the iron traction block 781, and the guide rod 79 extends into the guide hole. The guide rod 79 and the guide hole play a vertical guiding role for the blockage component 78 to prevent the blockage component 78 from tilting. At the same time, the crossbar plays a role in limiting the maximum downward movement of the blockage component 78.

[0047] The magnetic drive mechanism 8 also includes a power component, which drives two electromagnets 86 to rotate. The power component includes a vertical rotating rod 81 rotatably mounted on the bottom of the control housing 1. A turntable 82 is fixed to the upper end of the vertical rotating rod 81. Two sets of electromagnets 86 are fixed to the upper surface of the turntable 82. An external gear ring 83 is fixed to the lower end of the turntable 82. A motor 84 is fixed to the bottom of the control housing 1. A gear 85 that meshes with the external gear ring 83 is fixed to the output end of the motor 84. When the gear 85 is running, the two electromagnets 86 are rotated synchronously by the gear 85, the external gear ring 83, and the turntable 82. An electric slip ring 11 is provided on the outer side of the vertical rotating rod 81 to smoothly transmit power to the rotating electromagnets 86.

[0048] The upper surface of the control box base 1 is provided with a boss housing 3, and two electromagnets 86 are located inside the boss housing 3. The boss housing 3 protrudes from the upper surface of the control box base 1 to facilitate positioning the narrow-mouth bottle 4.

[0049] In use, the volume of solution in the narrow-mouth bottle 4 and the desired pH value to be adjusted are input to the control system via the control panel. The control system will calculate the required pH adjustment solution. During stirring, the flow rate of the pH adjustment solution is precisely controlled by the flow meter 62, and the pH value of the solution in the narrow-mouth bottle 4 is detected by the pH meter 10. If the pH is insufficient, more solution can be added based on the detected pH value. Alternatively, the amount of pH adjustment solution can be manually increased to improve the stirring effect. Of course, this device can also be used for mobile phases that do not require pH adjustment, serving solely as a stirring device.

[0050] Example 2

[0051] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figures 2-3 As shown, to further better realize the present invention, the following configuration is adopted: This embodiment adds a heating system, which includes a rod heater 5 fixed to the mounting plate 24. The heating rod 51 of the rod heater 5 extends downward and is inserted into the narrow-mouth bottle 4 together with the stirring paddle 7. A temperature sensor 9 for monitoring the temperature inside the narrow-mouth bottle 4 is installed on the infusion tube 61, which can monitor the temperature of the solution being heated inside the narrow-mouth bottle 4 and feed it back to the control system of the control box base 1.

[0052] Example 3

[0053] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figures 1-5 As shown, to further better realize the present invention, the following arrangement is specifically adopted: the stirring paddle 7 has a W-shaped structure. The stirring paddle 7 includes a rotating block 71 rotatably mounted on the infusion tube 61. Two inclined magnetic strips 72 are fixed to the lower side of the rotating block 71. The lower ends of the inclined magnetic strips 72 are inclined outward. A transverse block 73 is fixed to the lower end of the inclined magnetic strips 72. The transverse block 73 is made of plastic material. The outer ends of the two transverse blocks 73 are vertically flipped and mounted with flip magnetic strips 74. The inclined magnetic strips 72 and the flip magnetic strips 74 are connected in a W-shaped structure. 4. Since the magnetic poles at one end of each other are opposite, when there is no other force, the flipping magnetic strip 74 will be attracted to the inclined magnetic strip 72 and flipped inward due to the principle of attraction between opposite poles of magnets, which reduces the lateral dimension of the stirring paddle 7 so as to be placed into the narrow-mouth bottle 4. When the magnetic field of the electromagnet 86 increases to a predetermined value, the flipping magnetic strip 74 is attracted to the magnetic field of the electromagnet 86 and flipped outward, expanding the width of the stirring paddle 7. The magnetic field that drives the flipping magnetic strip 74 to flip outward is less than the magnetic field that attracts the blockage 78 and moves it downward.

[0054] The attraction force of electromagnet 86 to the flipping magnetic strip 74 is greater than that of tilting magnetic strip 72 to the flipping magnetic strip 74. Therefore, when the stirring paddle 7 is placed in the set position, the flipping magnetic strip 74 will flip outward to expand the stirring area of ​​the flipping magnetic strip 74. Moreover, electromagnet 86 is magnetically coupled with tilting magnetic strip 72 and flipping magnetic strip 74. When the two electromagnets 86 rotate, they drive the stirring paddle 7 to rotate synchronously.

[0055] Example 4

[0056] This embodiment is a further optimization based on Embodiment 3. The parts that are the same as those described above will not be repeated here. Figure 6As shown, to further better realize the present invention, the following arrangement is specifically adopted: the transverse block 73 and the flipping magnetic strip 74 are connected by a limiting member 76 to limit the maximum angle at which the flipping magnetic strip 74 flips outward. The limiting member 76 includes a rotating shaft 761 fixed to the flipping magnetic strip 74. The rotating shaft 761 is rotatably connected to the transverse block 73. The transverse block 73 has an arc-shaped groove 762 with the rotating shaft 761 as the center. The rotating shaft 761 is fixed with a limiting block 763 through a connecting rod. The limiting block 763 extends into the arc-shaped groove 762. Since the limiting block 763 can only move within the arc-shaped groove 762, the angle at which the flipping magnetic strip 74 flips can be limited, preventing the flipping magnetic strip 74 from flipping inward due to an excessively large outward flipping angle, thus preventing it from being flipped inward by the attraction force of the inclined magnetic strip 72.

[0057] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A magnetically-based mobile phase preparation apparatus, characterized in that, include: Control chassis base (1); The mounting mechanism (2) is located on the upper side of the control box base (1); Solution cup (6), the solution cup (6) is installed on the installation mechanism (2), and the lower end of the solution cup (6) is connected to and fixed with an infusion tube (61); A stirring paddle (7) is rotatably mounted on the lower end of an infusion tube (61). The stirring paddle (7) includes an inclined magnetic strip (72). An infusion inner hole (75) and a drain hole (77) communicating with the infusion inner hole (75) are provided in the stirring paddle (7). A plug (78) is provided in the drain hole (77). The magnetic attraction of the inclined magnetic strip (72) will attract the plug (78) upward to seal the infusion inner hole (75). pH meter (10) is used to monitor the pH value in the solution and feed it back to the control box base (1); A magnetic drive mechanism (8) is installed inside the control housing (1). The magnetic drive mechanism (8) includes a horizontally rotating electromagnet (86). The inclined magnetic strip (72) is magnetically coupled to the electromagnet (86) and rotates synchronously with the electromagnet (86). When the inclined magnetic strip (72) rotates, it stirs the liquid in the narrow-mouth bottle (4). At the same time, when the magnetic field of the electromagnet (86) is adjusted to a predetermined intensity, the blockage (78) can be attracted and moved downward, so that the solution is discharged from the infusion hole (75). The control housing (1) controls the time for the electromagnet (86) to enhance the magnetic field by the solution flow rate fed back by the pH meter (10).

2. The magnetically-based mobile phase preparation apparatus as described in claim 1, characterized in that, The stirring paddle (7) also includes a rotating block (71) rotatably mounted on the infusion tube (61), two inclined magnetic strips (72) are fixed on the lower side of the rotating block (71), the infusion inner hole (75) is opened in the rotating block (71) and the inclined magnetic strip (72), the lower end of the inclined magnetic strip (72) is fixed with a transverse block (73), and the drain hole (77) is opened in the transverse block (73).

3. The magnetically-based mobile phase preparation apparatus as described in claim 2, characterized in that, The blocking component (78) includes an iron traction block (781) vertically slidably disposed in the drain hole (77). The diameter of the iron traction block (781) is smaller than the diameter of the drain hole (77). A rubber block (782) is fixed to the upper end of the iron traction block (781). An inner cone is provided at the upper end of the drain hole (77). A frustum adapted to the slope of the inner cone is provided at the upper end of the rubber block (782). When the blocking component (78) moves to the inner cone due to the magnetic attraction of the inclined magnetic strip (72), the blocking component (78) blocks the inner cone. When the magnetic field of the electromagnet (86) is adjusted to a predetermined intensity, the blocking component (78) is attracted downward and moved out of the inner cone, and the solution is discharged through the drain hole (77).

4. The magnetically-based mobile phase preparation apparatus as described in claim 3, characterized in that, A guide rod (79) is fixed inside the drain hole (77) by a crossbar. A guide hole adapted to the guide rod (79) is opened on the lower side of the iron traction block (781), and the guide rod (79) extends into the guide hole.

5. The magnetically-based mobile phase preparation apparatus as described in claim 1, characterized in that, The mounting mechanism (2) includes a vertical rod (21) fixed to the upper side of the control box base (1). A sliding sleeve (22) is slidably provided on the vertical rod (21). A mounting plate (24) is fixed to the sliding sleeve (22) by a connecting rod. A bolt (23) is screwed onto the sliding sleeve (22). When the bolt (23) is loosened, the height of the mounting plate (24) can be adjusted by vertically sliding the sliding sleeve (22).

6. The magnetically-based mobile phase preparation apparatus as described in claim 1, characterized in that, A rod heater (5) is installed on the mounting mechanism (2), and the heating rod (51) of the rod heater (5) extends downward. A temperature sensor (9) is installed on the infusion tube (61) to monitor the temperature inside the narrow-mouth bottle (4) and feeds it back to the control box base (1).

7. The magnetically-based mobile phase preparation apparatus as described in claim 1, characterized in that, The magnetic drive mechanism (8) also includes a power component, which includes a vertical rotating rod (81) rotatably mounted on the bottom of the control box (1). A turntable (82) is fixed at the upper end of the vertical rotating rod (81). Two sets of electromagnets (86) are fixed on the upper surface of the turntable (82). An external gear ring (83) is fixed at the lower end of the turntable (82). A motor (84) is fixed at the bottom of the control box (1). A gear (85) that meshes with the external gear ring (83) is fixed at the output end of the motor (84). An electric slip ring (11) is provided on the outside of the vertical rotating rod (81) for transmitting power to the electromagnet (86).

8. The magnetically-based mobile phase preparation apparatus as described in claim 1, characterized in that, The upper surface of the control box base (1) is provided with a boss housing (3), and the two electromagnets (86) are located inside the boss housing (3).

9. The magnetically-based mobile phase preparation apparatus as described in claim 2, characterized in that, The outer end of the transverse block (73) is vertically flipped and mounted with a flipping magnetic strip (74), and the magnetic poles of the inclined magnetic strip (72) and the flipping magnetic strip (74) are opposite at one end. Under no other force, the flipping magnetic strip (74) will flip inward due to the magnetic attraction between the flipping magnetic strip (74) and the inclined magnetic strip (72). When the magnetic field of the electromagnet (86) increases to a predetermined value, the flipping magnetic strip (74) is attracted by the magnetic field of the electromagnet (86) and flips outward, expanding the width of the stirring paddle (7).

10. The magnetically-based mobile phase preparation apparatus as described in claim 9, characterized in that, The transverse block (73) and the flip magnetic strip (74) are connected by a limiting member (76). The limiting member (76) includes a rotating shaft (761) fixed to the flip magnetic strip (74). The rotating shaft (761) is rotatably connected to the transverse block (73). The transverse block (73) has an arc-shaped groove (762) with the rotating shaft (761) as the center. The rotating shaft (761) is fixed with a limiting block (763) by a connecting rod. The limiting block (763) extends into the arc-shaped groove (762).

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