Row magnetic frame

Abstract

The invention provides a row magnetic frame. The row magnetic frame comprises an upper plate frame, a base located below the upper plate frame and a magnet holder connected with the upper plate frame and the base. The upper plate frame is provided with two rows of mounting holes which are distributed in an array and are used for placing test tubes, and each row of mounting holes are arranged along the length direction of the magnet retainer; a plurality of magnet mounting grooves which are arrayed in the length direction are formed in the magnet holder, and a magnet assembly is arranged in each magnet mounting groove; each magnet assembly comprises a first magnet and a second magnet which are symmetrically arranged front and back; the third magnet and the fourth magnet are respectively positioned on the left and right sides of the first magnet and the second magnet; the magnetic pole directions of the first magnet and the second magnet are opposite and are perpendicular to the magnetic pole directions of the third magnet and the fourth magnet. Therefore, by improving the magnetic circuit design, the magnetic field intensity of the magnetic frame is improved, so that the magnetic bead adsorption capability is enhanced.

Description

Technical Field

[0001] This application belongs to the technical field of biological devices, and particularly relates to a row-connected magnetic rack. Background Art

[0002] Cell separation technology plays an important role in biomedical research. By effectively separating specific types of cells, researchers can deeply analyze the characteristics of cells and conduct applications such as drug testing. Traditional separation methods include flow cytometry, density gradient centrifugation, and immunomagnetic bead separation, etc. Among them, immunomagnetic bead separation has received extensive attention due to its high efficiency, strong specificity, and simple operation.

[0003] Magnetic beads, as the key tools for cell separation, are usually added to the sample solution to adsorb the target analyte onto the surface of the dispersed nano-magnetic beads. Under the action of an external magnetic field, the directional migration and separation of the magnetic beads are realized. Usually, this process is achieved through a magnetic rack. The magnetic rack generally consists of a main body bracket and a magnetic plate. There are test tube holes on the main body bracket, and a magnet is installed in the middle. During operation, the centrifuge tube containing the sample is placed in the hole. The magnetic beads in the sample will aggregate and adsorb on the test tube wall near the magnet under the action of the external magnetic field. Subsequently, the liquid can be aspirated away by a pipette, thereby realizing the separation of the magnetic beads from the sample solution.

[0004] The performance of adsorbed magnetic beads is affected by multiple factors, including the size, surface characteristics, and magnetism of the magnetic beads. The magnetic field strength is a key parameter affecting the adsorption of magnetic beads and the efficiency of cell separation. Research shows that a stronger magnetic field can more effectively adsorb small magnetic beads, thereby improving the efficiency of cell separation. However, traditional magnetic field designs are usually limited to below 5000 gauss (Gs). For smaller nano-magnetic beads (such as magnetic beads with a particle size < 200 nanometers), this may not be sufficient to achieve effective adsorption and separation.

[0005] Under the magnetic field condition below 5000 Gs, the adsorption efficiency of nano-magnetic beads is low, resulting in an extended separation time and a decreased recovery rate. This limitation significantly affects the efficiency and speed of cell separation in practical applications, and further affects the subsequent experimental and clinical application effects. Therefore, how to increase the magnetic field strength to improve the efficiency of cell separation has become an important topic. Summary of the Invention

[0006] In order to overcome or mitigate the deficiencies of the above-mentioned prior art, an object of this application is to provide a row-connected magnetic rack. By improving the magnetic circuit design, the magnetic field strength of the magnetic rack is increased, thereby enhancing the ability to adsorb magnetic beads and the efficiency of cell separation.

[0007] In order to achieve the above-mentioned invention object, the following technical solutions can be adopted in this application.

[0008] The present application provides a row-type magnetic rack, which includes an upper plate rack, a base located below the upper plate rack, and a magnet holder connecting the upper plate rack and the base.

[0009] The upper plate rack is provided with two rows of mounting holes arranged in an array for placing test tubes, and each row of the mounting holes is arranged along the length direction of the magnet holder.

[0010] The interior of the magnet holder is provided with a plurality of magnet mounting slots arranged in an array along the length direction, and each magnet mounting slot is provided with a magnet assembly; wherein, each magnet assembly includes: a first magnet and a second magnet symmetrically arranged front and back; and a third magnet and a fourth magnet respectively located on the left and right sides of the first magnet and the second magnet.

[0011] The magnetic pole directions of the first magnet and the second magnet are opposite, and the magnetic pole directions of the first magnet and the second magnet are perpendicular to the magnetic pole directions of the third magnet and the fourth magnet, so that the magnetic lines of force coming out of the first magnet of one magnet assembly can cross the third magnet or the fourth magnet on one side or both sides in the left-right direction to reach the first magnet of another magnet assembly beside the one magnet assembly, and the magnetic lines of force coming out of the second magnet of one magnet assembly can cross the third magnet or the fourth magnet on one side or both sides in the left-right direction to reach the second magnet of another magnet assembly beside the one magnet assembly.

[0012] In at least one embodiment, the magnetic pole directions of the first magnets in adjacent magnet mounting slots are opposite, and the magnetic pole directions of the second magnets in adjacent magnet mounting slots are opposite.

[0013] In the same magnet mounting slot, the magnetic pole directions of the third magnet and the fourth magnet are opposite, and in adjacent magnet mounting slots, the third magnet and the fourth magnet are adjacent and have the same magnetic pole direction.

[0014] In at least one embodiment, the first magnet and the second magnet have the same size, one third magnet and one fourth magnet located on the left and right sides of the row-type magnetic rack are end magnets, the widths of the third magnet and the fourth magnet between the end magnets in the left-right direction are the same, and the width of the end magnet is greater than the widths of the third magnet and the fourth magnet between the end magnets.

[0015] In at least one embodiment, the row-type magnetic rack further includes a rectangular iron sheet, the iron sheet is placed in the accommodation space formed by the first magnet, the second magnet, the third magnet and the fourth magnet, and the iron sheet can enhance the magnetic coupling strength between adjacent magnet assemblies through the magnetic conduction effect.

[0016] In at least one embodiment, a limiting groove penetrating the length direction of the magnet holder is provided on the back surface of the upper plate holder. Both sides of the limiting groove are tangent to two rows of mounting holes respectively. The upper end of the magnet holder is embedded in the limiting groove, and the magnet holder and the upper plate holder are fixed to each other by screws and / or bonding.

[0017] In at least one embodiment, the mounting holes include first mounting holes and second mounting holes. The centers of the front-and-back corresponding first mounting holes and second mounting holes are located at the same position in the left-right direction, and the diameter of the first mounting hole is smaller than the diameter of the second mounting hole.

[0018] In at least one embodiment, an annular sealing groove is provided on the outer periphery of each mounting hole, and a sealing ring is embedded in the annular sealing groove; and / or

[0019] A set screw hole communicating with the annular sealing groove is provided on the side wall of the upper plate holder, and the set screw can dynamically compress the sealing ring through the set screw hole.

[0020] In at least one embodiment, the base is an integral L-shaped base, which includes a base bottom and a base side wall that are perpendicular to each other. A plurality of positioning holes corresponding to the mounting holes are respectively provided on the base bottom and the base side wall for positioning the bottom of the test tube; the positioning holes include first positioning holes and second positioning holes.

[0021] In at least one embodiment, a positioning groove corresponding to the limiting groove on the back surface of the upper plate holder is provided on the base bottom of the base. The lower end of the magnet holder is embedded in the positioning groove, and the magnet holder and the base are fixed to each other by screws and / or bonding;

[0022] Two parallel glue overflow grooves are provided on the surface of the positioning groove. The glue overflow grooves extend along the length direction of the magnet holder, and the depth of the glue overflow grooves is smaller than the depth of the positioning groove, for guiding the flow of glue and accommodating the excess glue when potting the magnet assembly.

[0023] In at least one embodiment, the magnet mounting groove is formed by being separated by a mounting plate in the magnet holder. A cross-shaped reinforcing rib penetrating the height is provided at the center of the mounting plate; threaded holes are provided on both the upper and lower surfaces of the mounting plate, and the magnet holder is fixed to the upper plate holder and the base respectively by screws.

[0024] By adopting the above technical solution, the present application provides a row-type magnetic rack. By providing a plurality of magnet mounting grooves, and placing a magnet assembly in each magnet mounting groove, the magnetic field intensity of the magnetic rack can be effectively enhanced. Each magnet assembly is composed of multiple magnets, and the superimposed magnetic fields between these magnets interact with each other to form a stronger magnetic field, thereby further improving the adsorption efficiency of magnetic beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. shows a schematic structural diagram of a row-type magnetic rack according to an embodiment of the present application;

[0026] Figure 2 FIG. shows a schematic structural diagram of the row-type magnetic rack according to an embodiment of the present application from another angle;

[0027] Figure 3 FIG. shows Figure 1 the schematic structural diagram of the back surface of the upper plate rack in;

[0028] Figure 4 FIG. shows Figure 3 the schematic sectional view of the upper plate rack in;

[0029] Figure 5 FIG. shows Figure 1 the schematic structural diagram of the base in;

[0030] Figure 6 FIG. shows Figure 1 the schematic structural diagram of the magnet holder in;

[0031] Figure 7 FIG. shows the schematic structural diagram of the magnet assembly of the present application;

[0032] Figure 8 FIG. shows the magnetic field line distribution diagram of the magnet assembly of the present application;

[0033] Figure 9 FIG. shows the magnetic field intensity distribution diagram of the magnet assembly of the present application along the length direction of the magnet holder.

[0034] DESCRIPTION OF THE REFERENCE NUMERALS

[0035] 10 Upper plate rack;

[0036] 11 Mounting hole; 111 First mounting hole; 112 Second mounting hole;

[0037] 12 Limiting groove; 13 Annular sealing groove; 14 Set screw hole;

[0038] 20 Base;

[0039] 21 Positioning hole; 211 First positioning hole; 212 Second positioning hole; 213 Communication hole;

[0040] 22 Positioning groove; 23 Glue overflow groove;

[0041] 30 Magnet holder;

[0042] 31 Magnet mounting groove; 32 Mounting plate; 33 Cross stiffener;

[0043] 40 Magnet assembly

[0044] 41 First magnet; 42 Second magnet; 43 Third magnet; 44 Fourth magnet; 430 Third magnet on the left side; 440 Fourth magnet on the right side;

[0045] 50 Iron sheet;

[0046] 60 First test tube;

[0047] 70 Second test tube;

[0048] L Length direction; W Width direction; H Height direction Detailed implementation mode

[0049] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, rather than to exhaust all feasible ways of the present application, nor to limit the scope of the present application.

[0050] In the present application, unless otherwise specifically stated, the L direction represents the length direction of the row-type magnetic rack (magnet holder), the W direction represents the width direction of the row-type magnetic rack, and the H direction represents the height direction of the row-type magnetic rack. However, these are only directional terms given for convenience of description, and do not mean that the dimension in the width direction cannot be equal to or greater than the dimension in the length direction.

[0051] The present application will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0052] As Figure 1 shown, an embodiment of the present application provides a row-type magnetic rack, which may include an upper plate rack 10, a base 20 located below the upper plate rack 10, and a magnet holder 30 connecting the upper plate rack 10 and the base 20.

[0053] As Figure 2 shown, the upper plate rack 10 may be provided with two rows of mounting holes 11 arranged in an array for placing test tubes, and each row of mounting holes 11 is arranged along the length direction L of the magnet holder 30. By providing the mounting holes 11 arranged in an array, multiple test tubes can be placed, thereby improving the experimental efficiency. In this embodiment, the number of the first mounting holes 111 and the second mounting holes 112 arranged in an array may be 6 respectively. Further, the centers of the front and rear corresponding first mounting holes 111 and second mounting holes 112 are in the same position in the left-right direction.

[0054] In this embodiment, the diameters of the two rows of mounting holes 11 can be different. Among them, the first row of mounting holes 11 can be the first mounting holes 111 with a smaller diameter, and the second row of mounting holes 11 can be the second mounting holes 112 with a larger diameter. By providing the test tube mounting holes 11 with two different diameters, the magnetic rack provided by the present application has better versatility.

[0055] In this embodiment, as Figure 4 shown, an annular sealing groove 13 can be provided on the outer periphery of each mounting hole 11, and a sealing ring (such as an O-ring) can be embedded in the groove, so as to further fix the test tube in the radial direction. On the side wall of the upper plate rack 10, a set screw hole 14 communicating with the annular sealing groove 13 can be provided in the area corresponding to the mounting hole 11. Among them, the set screw can dynamically compress the sealing ring through the set screw hole 14 (that is, the screwing degree of the set screw is different, and the pressing degree on the sealing ring is different), so that the test tube can be fixed in the mounting hole 11.

[0056] When there is a large gap between the test tube and the mounting hole 11 (that is, for different specifications of test tubes), the displacement amount (screwing degree) of the set screw and the compression amount of the sealing ring can be coordinately adjusted, so that the test tube can be fixed in the mounting hole 11, thereby improving the compatibility of the magnetic rack with different test tube specifications.

[0057] In this embodiment, as Figure 3 shown, a limiting groove 12 penetrating the length direction L of the magnet holder 30 can be provided on the back surface of the upper plate rack 10. The side walls on both sides (both sides in the front-back direction) of the limiting groove 12 can be tangent to the first mounting hole 111 and the second mounting hole 112 respectively. As Figure 1 and Figure 2 shown, the upper end of the magnet holder 30 can be embedded in the limiting groove 12, so as to limit the magnet holder 30. The magnet holder 30 and the upper plate rack 10 can be fixed to each other by screws and / or bonding.

[0058] It can be understood that the front-back direction and the left-right direction here are only exemplary descriptions for easy understanding, and are not used to limit the use posture or direction of the test tube rack of the present application.

[0059] Preferably, in this embodiment, the magnet holder 30 can be detachably connected to the upper plate rack 10 by screws. A plurality of counterbores for installing screws can be provided on the upper plate rack 10. In this embodiment, 3 equally spaced counterbores are provided on the upper plate rack 10.

[0060] In this embodiment, as Figure 5 shown, the base 20 can be an integral L-shaped base, including a base bottom and a base side wall that are perpendicular to each other, wherein the height (height direction H) of the base side wall is greater than the height of the base bottom.

[0061] Specifically, the side wall of the base can be located below the first test tube hole 111, and the bottom of the base can be located below the second test tube hole 112. In addition, the height of the side wall of the base can also be adapted to the length of the first test tube 60, that is, when the first test tube 60 is placed in the first test tube hole 111, its bottom can be located on the side wall of the base.

[0062] As shown in Figure 5 the figure, the bottom of the base 20 can also be provided with a positioning groove 22 corresponding to the position of the limiting groove 12 on the back of the upper plate rack 10, so that the lower end of the magnet holder 30 can be limited, which is beneficial to the subsequent fixing and installation of the magnet holder 30. The magnet holder 30 and the base 20 can be fixed to each other by screws and / or bonding.

[0063] Preferably, in this embodiment, the magnet holder 30 can be fixed to the base 20 by screws. Further, the bottom of the base 20 can be provided with a plurality of counterbores, and their positions correspond to the threaded holes of the magnet holder 30.

[0064] It can be understood that, as shown in Figure 1 and Figure 2 the figure, by limiting the upper end and the lower end of the magnet holder 30 through the groove 12 and the positioning groove 22 respectively, the magnet holder 30 can be fixed to the bottom of the base 20 of the base 20, and its side wall can be closely attached to the side wall of the bottom of the base 20 of the base 20. In this way, the magnetic field generated by the magnet inside the magnet holder 30 can fully act on the magnetic beads in the first test tube 60 and the second test tube 70, so as to realize the effective adsorption of the magnetic beads in the test tube.

[0065] The walls (single-layer walls) on both sides in the width direction W of the magnet holder 30 can be relatively thin, and the position of the mounting hole 11 enables the first test tube 60 and the second test tube 70 to be close to or lean against the walls on both sides in the width direction W of the magnet holder 30, so that the magnetic field of the magnet assembly 40 can effectively act on the magnetic beads in the first test tube 60 and the second test tube 70.

[0066] Preferably, in this embodiment, the surfaces of the upper plate rack 10, the base 20 and the magnet holder 30 can be chamfered to remove surface burrs and improve the surface quality of the parts.

[0067] As shown in Figure 5 the figure, two parallel glue overflow grooves 23 can be provided on the surface of the positioning groove 22 for guiding the flow of the glue liquid and accommodating the excess glue liquid when potting the magnet. Specifically, in this embodiment, the glue overflow groove 23 can be rectangular, and the glue overflow groove 23 extends along the length direction L of the magnet holder 30, and its length can be less than or equal to the length of the positioning groove 22.

[0068] In this embodiment, as shown in Figure 5As shown, the base 20 can be provided with positioning holes 21 corresponding to the mounting holes 11 for fixing the bottom of the test tube. The positioning holes 21 can include a first positioning hole 211 and a second positioning hole 212. Among them, the position and size of the first positioning hole 211 correspond one-to-one with the first test tube hole 111, and the position and size of the second positioning hole 212 correspond one-to-one with the second test tube hole 112.

[0069] It can be understood that, as Figure 1 and Figure 2 shown, the first test tube 60 can pass through the first test tube hole 111, and its lower part can be fixed in the first positioning hole 211, while the second test tube 70 can pass through the second test tube hole 112, and its lower part can be fixed in the second positioning hole 212. Here, the mounting hole 11 can be a through hole, and the positioning hole 21 can be a through hole or a blind hole. The positioning hole 21 can be a tapered hole.

[0070] Preferably, in this embodiment, the first positioning hole 211 and the second positioning hole 212 can be hemispherical concave holes, so as to better adapt to the hemispherical bottom of the test tube and enable the test tube to be stably placed in the positioning hole 21.

[0071] Furthermore, as Figure 5 shown, communication holes 213 penetrating the base 20 can also be provided at the bottoms of the first positioning hole 211 and the second positioning hole 212. This can effectively prevent dust or water from accumulating inside the positioning hole 21 and is conducive to keeping the positioning hole 21 clean.

[0072] In this embodiment, as Figure 6 shown, a plurality of magnet mounting grooves 31 arranged in an array along its length direction L can be provided inside the magnet holder 30, and a magnet assembly 40 can be installed in each magnet mounting groove 31. Specifically, the magnet mounting groove 31 is a full-through type array groove, that is, the depth (height direction H) of the magnet mounting groove 31 can be the same as the depth of the magnet holder 30, that is, the upper and lower ends of the magnet mounting groove 31 penetrate the entire depth direction of the magnet holder 30.

[0073] In this embodiment, 6 magnet mounting grooves 31 can be provided inside the magnet holder 30.

[0074] Furthermore, the magnet mounting groove 31 can be formed by being separated by a plurality of mounting plates 32, and the thickness (dimension along the length direction L) of the mounting plate 32 can be 1 millimeter.

[0075] As Figure 6As shown, a cross-shaped reinforcing rib 33 penetrating its depth can also be provided at the center of each mounting plate 32 to enhance the reliability of the mounting plate 32. In this embodiment, the flange of the cross-shaped reinforcing rib 33 can symmetrically extend 1 millimeter outwards on both sides of the mounting plate 32 (both sides in the length direction L), the length (dimension in the width direction W) can be set to 3 millimeters, and the depth (dimension in the height direction H) can be the same as the depth of the mounting plate 32.

[0076] Further, as Figure 6 shown, threaded holes can be provided on both the upper and lower surfaces of the mounting plate 32, and the magnet holder 30 can be fixed to the upper plate holder 10 and the base 20 respectively by screws.

[0077] In this embodiment, as Figure 7 shown, the magnet assembly 40 includes a first magnet 41 and a second magnet 42 symmetrically arranged front and back, and third magnets 43 and fourth magnets 44 located on the left and right sides of the first magnet 41 and the second magnet 42. Among them, the magnetic pole directions of the first magnet 41 and the second magnet 42 are perpendicular to the magnetic pole directions of the third magnet 43 and the fourth magnet 44. Figure 7 The arrows on each magnet in

[0078] can represent the magnetic pole directions of the respective magnets. For example, the front part of the arrow is the N pole (north pole) of the magnet, and the tail part of the arrow is the S pole (south pole) of the magnet. Figure 7 It can be understood that

[0079] only the arrangement of the magnet assembly 40 in the magnet holder 30 is schematically shown. The two side walls of the magnet holder 30 in the width direction W can have the same or different structures. For example, the two side walls of the magnet holder 30 in the width direction W can be planes or planes with arc-shaped grooves. The thinner plane or the plane with arc-shaped grooves can both enable the magnetic field of the magnet assembly 40 to act on the test tubes on both sides sufficiently.

[0080] Further, in this embodiment, the first magnet 41 and the second magnet 42 can have the same size. The cross-section (section along the horizontal direction) of the first magnet 41 and the second magnet 42 can be approximately square. For example, the length and width of the first magnet 41 and the second magnet 42 can differ by within 20%. The height of the first magnet 41 and the second magnet 42 can be greater than their length and width.

[0081] In this embodiment, within the same magnet mounting groove 31, the magnetic pole directions of the third magnet 43 and the fourth magnet 44 are opposite. In adjacent magnet mounting grooves 31, the third magnet 43 and the fourth magnet 44 are arranged adjacent to each other and have the same magnetic pole direction.

[0082] See Figure 7 , the lengths of the third magnet 43 and the fourth magnet 44 (dimensions along the width direction W) can be approximately equal to the sum of the lengths of the first magnet 41 and the second magnet 42. In particular, it can be equal to the sum of the lengths of the first magnet 41, the second magnet 42, and the length (or thickness, along the width direction W) of the iron sheet 50 described below.

[0083] Furthermore, as Figure 7 shown, one third magnet 43 and one fourth magnet 44 located on the left and right sides of the magnetic rack respectively are end magnets. For example, the third magnet 430 on the left and the fourth magnet 440 on the right can be end magnets. The widths (dimensions along the length direction L) of the third magnet 43 and the fourth magnet 44 between the end magnets are the same, and their widths are greater than the widths of the third magnet 43 and the fourth magnet 44 between the end magnets. In this way, the larger width of the end magnets can compensate for the attenuation of the edge magnetic field, so that the edge region of the magnetic rack also has a relatively high magnetic field strength.

[0084] In this embodiment, as Figure 7 shown, the magnetic rack provided in the present application further includes a rectangular iron sheet 50, which is arranged in the accommodation space jointly surrounded by the first magnet 41, the second magnet 42, the third magnet 43, and the fourth magnet 44. Through its magnetic conduction effect, the iron sheet 50 can enhance the magnetic coupling strength between adjacent magnet components, thereby improving the overall magnetic field strength of the magnetic rack.

[0085] Figure 8 shows the magnetic field line distribution diagram of the magnet components along the length direction of the magnet holder. It can be seen from the figure that the magnetic field lines coming out of the first magnet 41 of one magnet component 40 can cross the third magnet 43 or the fourth magnet 44 on one side or both sides in the left-right direction to reach the first magnet 41 of another magnet component 40 adjacent to this one magnet component 40, and the magnetic field lines coming out of the second magnet 42 of one magnet component 40 can cross the third magnet 43 or the fourth magnet 44 on one side or both sides in the left-right direction to reach the second magnet 42 of another magnet component 40 adjacent to this one magnet component 40.

[0086] Figure 9 shows the magnetic field strength distribution of the magnet components of the present application along the length direction of the magnet holder. Among them, Figure 9 the abscissa is the dimension of the magnet holder along the length direction, with the unit of millimeter, and the ordinate is the magnetic field strength, with the unit of tesla (T, where 1T = 10 4Gs). It can be seen from the figure that the magnetic field strength reaches its peak in the area indicated by the arrow (i.e., the area near the test tube mounting hole), and the maximum value is about 0.7 T. Thus, it can be known that the magnetic field strength in the area of the test tube mounting hole of the magnetic rack is significantly enhanced, and effective adsorption of magnetic beads in the test tube can be achieved.

[0087] By providing a plurality of magnet mounting grooves on the magnetic rack, and placing a magnet assembly in each magnet mounting groove, the overall magnetic field strength of the magnetic rack can be effectively enhanced. In addition, each magnet assembly is composed of multiple magnets, and the superimposed magnetic fields between these magnets interact with each other to form a stronger magnetic field, thereby further improving the adsorption efficiency of the magnetic beads.

Claims

1. A row magnetic rack, characterized in that, It includes an upper plate frame (10), a base (20) located below the upper plate frame (10), and a magnet holder (30) connecting the upper plate frame (10) and the base (20). The upper plate frame (10) is provided with two rows of mounting holes (11) distributed in an array for placing test tubes, and each row of the mounting holes (11) is arranged along the length direction (L) of the magnet holder (30). Inside the magnet holder (30), there are a plurality of magnet mounting slots (31) arranged in an array along the length direction (L), and each magnet mounting slot (31) is provided with a magnet assembly (40); wherein, each magnet assembly (40) includes: a first magnet (41) and a second magnet (42) symmetrically arranged front and back; and a third magnet (43) and a fourth magnet (44) respectively located on the left and right sides of the first magnet (41) and the second magnet (42). The magnetic pole directions of the first magnet (41) and the second magnet (42) are opposite, and the magnetic pole directions of the first magnet (41) and the second magnet (42) are perpendicular to the magnetic pole directions of the third magnet (43) and the fourth magnet (44), so that the magnetic lines of force coming out of the first magnet (41) of one magnet assembly (40) can cross the third magnet (43) or the fourth magnet (44) on one side or both sides in the left - right direction to reach the first magnet (41) of another magnet assembly (40) next to this one magnet assembly (40), and the magnetic lines of force coming out of the second magnet (42) of one magnet assembly (40) can cross the third magnet (43) or the fourth magnet (44) on one side or both sides in the left - right direction to reach the second magnet (42) of another magnet assembly (40) next to this one magnet assembly (40).

2. The row magnetic rack according to claim 1, wherein The magnetic pole directions of the first magnets (41) in adjacent magnet mounting slots (31) are opposite, and the magnetic pole directions of the second magnets (42) in adjacent magnet mounting slots (31) are opposite. In the same magnet mounting slot (31), the magnetic pole directions of the third magnet (43) and the fourth magnet (44) are opposite, and in adjacent magnet mounting slots (31), the third magnet (43) and the fourth magnet (44) are adjacent and have the same magnetic pole direction.

3. The row magnetic rack according to claim 2, wherein The first magnet (41) and the second magnet (42) have the same size. One third magnet and one fourth magnet located on the left and right sides of the row - type magnetic force frame are end magnets. The third magnets (43) and the fourth magnets (44) between the end magnets have the same width in the left - right direction, and the width of the end magnets is greater than the width of the third magnets (43) and the fourth magnets (44) between the end magnets.

4. The row magnetic rack according to claim 3, wherein The row magnetic rack further includes a rectangular iron sheet (50) placed in the accommodating space formed by the first magnet (41), the second magnet (42), the third magnet (43), and the fourth magnet (44). The iron sheet (50) can enhance the magnetic coupling strength between adjacent magnet assemblies (40) through magnetic conduction.

5. The row magnetic rack according to claim 1, characterized in that, A limiting groove (12) penetrating the length direction (L) of the magnet holder (30) is provided on the back surface of the upper plate holder (10). Both sides of the limiting groove (12) are tangent to two rows of mounting holes (11). The upper end of the magnet holder (30) is embedded in the limiting groove (12), and the magnet holder (30) and the upper plate holder (10) are fixed to each other by screws and / or bonding.

6. The row magnetic rack according to claim 1, wherein The mounting holes (11) include a first mounting hole (111) and a second mounting hole (112). The centers of the front and rear corresponding first mounting holes (111) and second mounting holes (112) are located at the same position in the left-right direction, and the diameter of the first mounting hole (111) is smaller than the diameter of the second mounting hole (112).

7. The row magnetic rack according to claim 6, characterized in that, An annular sealing groove (13) is provided on the outer periphery of each mounting hole (11), and a sealing ring is embedded in the annular sealing groove (13); and / or A set screw hole (14) communicating with the annular sealing groove (13) is provided on the side wall of the upper plate holder (10), and a set screw can dynamically compress the sealing ring through the set screw hole (14).

8. The row magnetic rack according to claim 1, wherein The base (20) is an integral L-shaped base, which includes a base bottom and a base side wall perpendicular to each other. A plurality of positioning holes (21) corresponding to the mounting holes (11) are respectively provided on the base bottom and the base side wall for positioning the bottom of the test tube; the positioning holes (21) include a first positioning hole (211) and a second positioning hole (212).

9. The row magnetic rack according to claim 8, wherein, A positioning groove (22) corresponding to the limiting groove (12) on the back surface of the upper plate holder (10) is provided on the base bottom of the base (20). The lower end of the magnet holder (30) is embedded in the positioning groove (22), and the magnet holder (30) and the base (20) are fixed to each other by screws and / or bonding; Two parallel glue overflow grooves (23) are provided on the surface of the positioning groove (22). The glue overflow grooves (23) extend along the length direction (L) of the magnet holder (30), and the depth of the glue overflow grooves (23) is smaller than the depth of the positioning groove (22) for guiding the flow of glue and accommodating excess glue when potting the magnet assembly (40).

10. The row magnetic rack according to claim 1, wherein The magnet mounting groove (31) is formed by separating an installation plate (32) in the magnet holder (30). A cross-shaped reinforcing rib (33) penetrating the height is provided at the center of the installation plate (32); threaded holes are provided on both the upper and lower surfaces of the installation plate (32), and the magnet holder (30) is fixed to the upper plate holder (10) and the base (20) respectively by screws.

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