Device capable of quantitatively adding DNA (deoxyribonucleic acid) ploidy staining solution

Abstract

The utility model provides a device capable of quantitatively adding DNA (Deoxyribose Nucleic Acid) ploidy staining fluid, which relates to the technical field of fluid injection, and comprises a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder, a fluid taking cylinder and a fluid taking cylinder, and is characterized in that the fluid taking cylinder can be used for temporarily storing the staining fluid under the action of air pressure, and one end of the fluid taking cylinder is provided with an outlet; the electromagnetic liquid extraction component is in a rod shape, one end of the electromagnetic liquid extraction component is arranged in the liquid extraction cylinder to serve as a piston, the other end of the electromagnetic liquid extraction component extends out of the liquid extraction cylinder to be pushed, and the magnetic force of the electromagnetic liquid extraction component can be changed. During use, the permanent magnet ring is arranged in the liquid extraction cylinder, the movable electromagnetic liquid extraction component is arranged in the liquid extraction cylinder, the magnetic force of the electromagnetic liquid extraction component can be changed, and the repulsive force of the permanent magnet ring to the electromagnetic liquid extraction component is changed by changing the magnetic force of the electromagnetic liquid extraction component; the end part of the electromagnetic liquid extraction part is pushed to a specified scale, and the staining fluid is quantitatively extracted, so that the effect of quantitatively adding the staining fluid is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid injection technical field, especially a device that can quantitatively add DNA ploidy staining liquid. BACKGROUND

[0002] DNA ploidy staining liquid is an important reagent for cytogenetic research, and the staining effect of the staining liquid can classify the ploidy properties of cells and make the cells convenient to observe and count.

[0003] When performing DNA ploidy analysis, it is necessary to add staining liquid, so that the detection personnel can conveniently find the abnormality of DNA ploidy and timely find the malignant cells.

[0004] When adding the staining liquid, it is generally necessary to quantitatively add. The existing adding means are mostly using droppers, pipettes and the like. Among them, the accuracy of the dropper is poor, and it is now rarely used. The pipette has a complex structure, and the amount of liquid sucked by the pipette can only be controlled between 10 microliters and 1000 microliters, the amount of suction is small, and the pipette needs to be used with a pipette tip every time, which is troublesome to operate. Especially in the hospital laboratory, a large amount of analysis needs to be performed every day, which is more troublesome.

[0005] Therefore, the present application provides a device that can quantitatively add DNA ploidy staining liquid, which is used to simplify the device and improve the convenience of use. UTILITY MODEL CONTENT

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a device that can quantitatively add DNA ploidy staining liquid, which is used to solve the problem of inconvenient use in the prior art.

[0007] To achieve the above-mentioned purposes and other related purposes, the utility model provides a device that can quantitatively add DNA ploidy staining liquid, which comprises:

[0008] A liquid taking cylinder, which can be used to temporarily store the staining liquid under the action of air pressure, and one end of the liquid taking cylinder is provided with an outlet for sucking and discharging liquid;

[0009] An electromagnetic liquid pumping component, which is in the shape of a rod, one end of the electromagnetic liquid pumping component is arranged inside the liquid taking cylinder as a piston, the other end of the electromagnetic liquid pumping component extends to the outside of the liquid taking cylinder and can be pushed, and the magnetic force of the electromagnetic liquid pumping component can be changed;

[0010] A permanent magnet ring, which is arranged inside the liquid taking cylinder near the outlet, and the permanent magnet ring can push the electromagnetic liquid pumping component to quantitatively move under the action of the magnetic force.

[0011] Preferably, the liquid taking cylinder is made of transparent material, and the outer surface of the liquid taking cylinder is provided with scale marks along the axial direction.

[0012] Preferably, the electromagnetic liquid pumping component comprises a piston connecting rod, one end of the piston connecting rod is provided with a piston head abutting against the inner wall of the liquid taking cylinder, and the other end of the piston connecting rod is provided with a hand pushing handle.

[0013] The piston connecting rod is internally provided with a component mounting cavity, and the component mounting cavity is internally provided with a magnetic rebound part.

[0014] The top of the hand pushing handle is provided with a silicon controlled regulator, the silicon controlled regulator is electrically connected with the magnetic rebound part, and rotating the silicon controlled regulator can control the magnetic strength of the magnetic rebound part.

[0015] Preferably, the top of the hand pushing handle is provided with a disc scale, the top of the silicon controlled regulator is provided with an indication mark, and the disc scale can indicate the volume of the liquid taking cylinder after the piston head is moved by the magnetic force generated by the magnetic rebound part.

[0016] Preferably, the magnetic rebound part comprises a metal magnetic head and a power supply device, the metal magnetic head is wrapped by the piston head, one end of the metal magnetic head facing the piston connecting rod is provided with a metal magnetic core, the outer surface of the metal magnetic core is wound with an electromagnetic coil, and the power supply device is provided with a power supply interface extending to the outside of the piston connecting rod.

[0017] The electromagnetic coil and the power supply device are electrically connected with the silicon controlled regulator, and the silicon controlled regulator can control the current of the electromagnetic coil.

[0018] Preferably, the outer surface of the piston connecting rod is provided with a damping mechanism, and the outer surface of the damping mechanism abuts against the inner wall of the liquid taking cylinder.

[0019] Preferably, the damping mechanism comprises a support disc, the side surface of the support disc is provided with a plurality of damping beads, the damping beads have elasticity, and the outer surface of the damping beads abuts against the inner wall of the liquid taking cylinder.

[0020] Preferably, the inside of the support disc is provided with a plurality of telescopic cavities arranged in a circumferential array around the axis of the support disc, and the inside of all the telescopic cavities is provided with an elastic member.

[0021] Preferably, the telescopic cavity is a tapered circular groove, the damping bead is a ball, the outer surface of the damping bead extends to the outer surface of the support disc, and the inner diameter of one end of the telescopic cavity facing the inner wall of the liquid taking cylinder is smaller than the diameter of the damping bead.

[0022] Preferably, the damping ball can roll inside the telescopic cavity.

[0023] As described above, the device has the following beneficial effects:

[0024] 1、The utility model discloses a kind of devices for quantitatively adding DNA ploidy dyeing liquid, with the following beneficial effects:

[0025] 2、The utility model discloses a kind of devices for quantitatively adding DNA ploidy dyeing liquid, with the following beneficial effects:

[0026] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It shows the structure diagram of the utility model.

[0028] Figure 2 It shows the explosion diagram of the utility model.

[0029] Figure 3 It shows the structure diagram of the utility model taking liquid cylinder.

[0030] Figure 4 It shows the structure diagram of the utility model electromagnetic liquid pumping component.

[0031] Figure 5 It shows the structure section view of the utility model electromagnetic liquid pumping component.

[0032] Figure 6 It shows the structure section view of the utility model damping mechanism.

[0033] ELEMENT NUMBER EXPLANATION

[0034] 1, taking liquid cylinder;101, scale mark;

[0035] 2. Electromagnetic liquid pumping component; 201. Piston connecting rod; 2011. Component mounting cavity; 202. Piston head; 203. Handle; 204. Magnetic rebound part; 2041. Metal magnetic head; 2042. Metal magnetic core; 2043. Electromagnetic coil; 2044. Power supply device; 2045. Power supply interface; 205. Silicon controlled regulator; 206. Disc scale; 207. Indication mark;

[0036] 3. Permanent magnet ring;

[0037] 4. Damping mechanism; 401. Support disc; 4011. Telescopic cavity; 4012. Elastic member; 402. Damping ball. DETAILED DESCRIPTION

[0038] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0039] Please refer to Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to understand and read the content disclosed in the specification for those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0040] As Figures 1-3As shown, the utility model provides a device of DNA ploidy staining solution can be quantitatively added, including liquid taking cylinder 1, electromagnetic liquid pumping component 2 and permanent magnet ring 3. Liquid taking cylinder 1 can be used for the temporary storage of staining solution under the action of air pressure. And one end of liquid taking cylinder 1 is provided with an outlet for sucking and discharging liquid. Electromagnetic liquid pumping component 2 is rod-shaped, and one end of electromagnetic liquid pumping component 2 is arranged in the inside of liquid taking cylinder 1 as a piston. The other end of electromagnetic liquid pumping component 2 extends to the outside of liquid taking cylinder 1 and can be pushed, and the movement of the piston realizes the extraction and injection of staining solution. The magnetic force of electromagnetic liquid pumping component 2 can be changed. Permanent magnet ring 3 is arranged in the inside of liquid taking cylinder 1 close to the outlet position, and permanent magnet ring 3 can push electromagnetic liquid pumping component 2 to move quantitatively under the action of magnetic force. When the magnetism of electromagnetic liquid pumping component 2 is small, the repulsive force exerted by permanent magnet ring 3 on electromagnetic liquid pumping component 2 will be relatively small, and when the magnetism of electromagnetic liquid pumping component 2 increases, the thrust of permanent magnet ring 3 on electromagnetic liquid pumping component 2 will increase, so as to change the moving distance of electromagnetic liquid pumping component 2 and control the amount of extracted staining solution.

[0041] The repulsive force of permanent magnet ring 3 on electromagnetic liquid pumping component 2 can be obtained by the following formula, so as to realize accurate control of the moving amount of electromagnetic liquid pumping component 2:

[0042] [F=F (d) =K*(m1*m2) / d^2]

[0043] Wherein:

[0044] (F) represents the magnetic force, (m_1) and (m_2) are the magnetic pole strength of two magnets, (r) represents the distance between the two magnets, (\mu_0) is the vacuum permeability, and the value is (4\pi\times 10^{-7}) H / m

[0045] Or

[0046] F (d) =K*(m1*m2) / d^2

[0047] Wherein, F (d) is the magnetic attraction, K is a constant, m1 is the magnetic moment of magnet 1, m2 is the magnetic moment of magnet 2, and d is the distance between the two magnets.

[0048] According to the above formula and the friction coefficient, the accurate distance of electromagnetic liquid pumping component 2 can be accurately obtained, so as to realize the extraction amount of the extracted staining solution. And through the experiment, when a small amount of staining solution is extracted, the pressing force of the hand can easily make the piston head 202 and the permanent magnet ring 3 adhere, so that the staining solution in the liquid taking cylinder 1 is completely discharged.

[0049] As Figure 1As shown, in some embodiments, the liquid taking cylinder 1 is made of transparent material. The liquid taking cylinder 1 is made of transparent material, so that the inside of the liquid taking cylinder 1 can be observed conveniently. The outer surface of the liquid taking cylinder 1 is provided with scale marks 101 in the axial direction. When the inside of the liquid taking cylinder 1 contains dyeing liquid, the capacity of the dyeing liquid can be known intuitively through the scale marks 101. The capacity can be compared with the set capacity. When there is an error in the degrees of the two, the electromagnetic liquid pumping component 2 needs to be corrected to ensure that the degrees of the two are consistent.

[0050] As shown in the drawings, Figures 4-5 In some embodiments, the electromagnetic liquid pumping component 2 comprises a piston connecting rod 201. One end of the piston connecting rod 201 is provided with a piston head 202 which is attached to the inner wall of the liquid taking cylinder 1. The piston head 202 is moved to pump out and discharge the air inside the liquid taking cylinder 1. The pumping of the dyeing liquid is realized through air pressure. The other end of the piston connecting rod 201 is provided with a hand push handle 203 for facilitating the user to press, so as to discharge the dyeing liquid inside the liquid taking cylinder 1 and realize the addition of the dyeing liquid.

[0051] The piston connecting rod 201 is provided with a component mounting cavity 2011 in the inside. The component mounting cavity 2011 is provided with a magnetic rebound part 204 in the inside. The magnetic rebound part 204 is magnetized after being electrified, and can repel the permanent magnet ring 3 to drive the piston head 202 to pump liquid.

[0052] The size of the magnetization of the magnetic rebound part 204 can be calculated according to the formula:

[0053] F=BILsinaθ

[0054] Wherein:

[0055] F: the electromagnetic force of the conductor in the magnetic field, B: the magnetic induction intensity of the magnetic field, I: the current in the conductor, L: the length of the conductor in the magnetic field, θ: the included angle between the magnetic induction intensity direction and the current direction.

[0056] In addition, the Lorentz force formula F=qE+qvB can also be used to calculate the electromagnetic force of the charged particle in the electromagnetic field.

[0057] The top of the hand push handle 203 is provided with a silicon controlled regulator 205. The silicon controlled regulator 205 is electrically connected with the magnetic rebound part 204. The rotation of the silicon controlled regulator 205 can control the magnetic size of the magnetic rebound part 204.

[0058] Therefore, the device has multiple working modes: automatic quantitative pumping mode, manual pumping mode in the micro-magnetic state, and anti-falling mode in the demagnetization state (when not in use, to prevent the electromagnetic liquid pumping component 2 from falling off).

[0059] As shown in the drawings, Figure 4As shown, in some embodiments, the top of the push handle 203 of this utility model is provided with a circular scale 206, which is calculated according to the above formula. It directly replaces the current adjustment number with a volume number, making it convenient for the user to adjust intuitively. The side of the circular scale 206 is provided with degree markings (not shown in the figure). The top of the thyristor regulator 205 is provided with an indicator mark 207, and the circular scale 206 can indicate the volume after the magnetic rebound part 204 generates magnetic force and pushes the piston head 202 to move.

[0060] like Figure 5 As shown, in some embodiments, the magnetic rebound part 204 of this utility model includes a metal magnetic head 2041 and a power supply device 2044. The metal magnetic head 2041 is enclosed by the piston head 202. A metal magnetic core 2042 is provided at the end of the metal magnetic head 2041 facing the piston connecting rod 201, and an electromagnetic coil 2043 is wound around the outer surface of the metal magnetic core 2042. When the electromagnetic coil 2043 is energized, it magnetizes the metal magnetic core 2042 and the metal magnetic head 2041 respectively, generating magnetic poles that repel the permanent magnet ring 3. A power interface 2045 is provided on the power supply device 2044, extending to the outside of the piston connecting rod 201. The power interface 2045 can charge the power supply device 2044 to ensure that the power supply device 2044 has sufficient power to supply the electromagnetic coil 2043. The power supply device 2044 can be a lithium battery or other device that can store electrical energy or a transformer, and the type of the power interface 2045 is adapted according to the type of the power supply device 2044.

[0061] Both the electromagnetic coil 2043 and the power supply device 2044 are electrically connected to the thyristor regulator 205, which can control the current of the electromagnetic coil 2043.

[0062] like Figure 1 As shown, in some embodiments, a damping mechanism 4 is provided on the outer surface of the piston connecting rod 201 of this invention. The outer surface of the damping mechanism 4 abuts against the inner wall of the liquid-taking cylinder 1 to slow down the moving speed of the piston head 202. The closer the distance between the metal magnetic head 2041 and the permanent magnet ring 3, the greater the repulsive force of the piston head 202, and the faster the initial velocity of the piston head 202 will be. The damping mechanism 4 is provided to counteract the inertia of the piston head 202 and keep the movement of the piston head 202 stable.

[0063] like Figure 1 and Figure 4As shown, in some embodiments, the damping mechanism 4 comprises a support disc 401, and the side surface of the support disc 401 is provided with a plurality of damping beads 402, the damping beads 402 are elastic, and the outer surface of the damping beads 402 is in contact with the inner wall of the liquid taking cylinder 1. The contact between the damping beads 402 and the inner wall of the liquid taking cylinder 1 increases the friction, thereby offsetting the inertia in the movement of the piston head 202, and ensuring that the piston head 202 can be accurately driven to the specified position.

[0064] As shown, Figure 6 As shown, in some embodiments, the inside of the support disc 401 is provided with a plurality of telescopic cavities 4011 which are distributed in the circumferential direction of the shaft of the support disc 401, and the inside of all the telescopic cavities 4011 is provided with an elastic element 4012, and each elastic element 4012 applies a pushing force to the corresponding damping bead 402 in the direction of the inner wall of the liquid taking cylinder 1. Therefore, the damping bead 402 can always maintain the pressure on the inner wall of the liquid taking cylinder 1.

[0065] As shown, Figure 6 As shown, in some embodiments, the telescopic cavity 4011 is a conical groove, the damping bead 402 is a ball, the outer surface of the damping bead 402 extends to the outer surface of the support disc 401, and the inner diameter of the end of the telescopic cavity 4011 which faces the inner wall of the liquid taking cylinder 1 is smaller than the diameter of the damping bead 402. Therefore, when the elastic element 4012 applies pressure to the damping bead 402, the damping bead 402 can be in contact with the inner wall of the liquid taking cylinder 1 without falling off from the inside of the component mounting cavity 2011.

[0066] It should be noted that the damping bead 402 can roll in the telescopic cavity 4011. The hard friction is converted into rolling friction, and the service life of the device is improved.

[0067] The specific use process of the utility model is as follows:

[0068] According to the needs of the analysis experiment, the silicon controlled regulator 205 is adjusted by fingers, and the specified scale of the disc scale 206 is reached by the indicating mark 207;

[0069] The fingers are used to press the hand handle 203, the piston head 202 is moved to be in contact with the permanent magnet ring 3, and the internal volume of the liquid taking cylinder 1 is zeroed;

[0070] The mouth part of the liquid taking cylinder 1 is moved into the dyeing liquid, the pressure on the hand handle 203 is released, the hand handle 203 returns to the initial position, and the dyeing liquid is extracted into the inside of the liquid taking cylinder 1 for temporary storage;

[0071] The liquid taking cylinder 1 is moved to the specified position, the hand handle 203 is pressed to make the piston head 202 contact the permanent magnet ring 3 again, and the dyeing liquid in the liquid taking cylinder 1 is completely discharged;

[0072] The above operation is repeated to add the staining solution to multiple groups of samples;

[0073] When the precise scale is not required, the piston head 202 can continue to be manually extracted after automatically extracting the staining solution, thereby realizing non-quantitative acquisition of the staining solution.

[0074] When the device is not used, the silicon-controlled regulator 205 is rotated to the zero position to demagnetize the magnetic rebound part 204, and then the hand lever 203 is pushed to make the piston head 202 adsorbed and attached to the permanent magnet ring 3, thereby avoiding loss of the piston head 202.

[0075] In summary, the device for quantitatively adding DNA ploidy staining solution of the present application sets the permanent magnet ring 3 in the inside of the liquid taking cylinder 1, sets the movable electromagnetic liquid extracting part 2 in the inside of the liquid taking cylinder 1, and changes the magnetic force of the electromagnetic liquid extracting part 2, thereby changing the repulsive force of the permanent magnet ring 3 on the electromagnetic liquid extracting part 2, pushing the end of the electromagnetic liquid extracting part 2 to the specified scale, quantitatively extracting the staining solution, and realizing the effect of quantitatively adding the staining solution.

[0076] Meanwhile, the present application sets the damping mechanism 4 on the outer surface of the electromagnetic liquid extracting part 2, and makes the outer surface of the damping mechanism 4 and the inner wall of the liquid taking cylinder 1 overlap to form resistance, thereby effectively avoiding the electromagnetic liquid extracting part 2 from exceeding the predetermined scale due to too fast moving speed when the permanent magnet ring 3 repels the electromagnetic liquid extracting part 2, and achieving the effect of improving the liquid taking precision.

[0077] Therefore, the present application effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0078] The above embodiments only exemplarily illustrate the principle and effect of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A device for dosing a DNA ploid staining solution, characterized in that The application relates to a liquid taking cylinder (1) which can be used for temporarily storing dyeing liquid under the action of air pressure, and one end of the liquid taking cylinder (1) is provided with an outlet for sucking and discharging liquid; an electromagnetic liquid pumping component (2) which is in the shape of a rod, one end of the electromagnetic liquid pumping component (2) is arranged inside the liquid taking cylinder (1) as a piston, the other end of the electromagnetic liquid pumping component (2) extends to the outside of the liquid taking cylinder (1) and can be pushed, and the magnetic force of the electromagnetic liquid pumping component (2) can be changed; a permanent magnetic ring (3) which is arranged inside the liquid taking cylinder (1) close to the outlet position, and the permanent magnetic ring (3) can quantitatively move the electromagnetic liquid pumping component (2) under the action of magnetic force. The liquid taking cylinder (1) is made of transparent material, and the outer surface of the liquid taking cylinder (1) is provided with scale marks (101) along the axial direction. The electromagnetic liquid pumping component (2) comprises a piston connecting rod (201), one end of the piston connecting rod (201) is provided with a piston head (202) which is attached to the inner wall of the liquid taking cylinder (1), and the other end of the piston connecting rod (201) is provided with a hand pushing handle (203). The inside of the piston connecting rod (201) is provided with a component mounting cavity (2011), the inside of the component mounting cavity (2011) is provided with a magnetic rebound part (204), the magnetic rebound part (204) can be magnetized to repel the permanent magnetic ring (3) and push the piston head (202) to pump liquid after being electrified.

2. The device for dosing DNA staining solution according to claim 1, characterized in that: The top of the hand pushing handle (203) is provided with a silicon controlled regulator (205), the silicon controlled regulator (205) is electrically connected with the magnetic rebound part (204), and the magnetic size of the magnetic rebound part (204) can be controlled by rotating the silicon controlled regulator (205).

3. The device for dosing DNA staining solution according to claim 1, characterized in that: The top of the hand pushing handle (203) is provided with a disc scale (206), the top of the silicon controlled regulator (205) is provided with an indicating mark (207), and the disc scale (206) can indicate the volume of the piston head (202) after the magnetic rebound part (204) generates magnetic force and pushes the piston head (202) to move. The magnetic rebound part (204) comprises a metal magnetic head (2041) and a power supply device (2044), the metal magnetic head (2041) is wrapped by the piston head (202), one end of the metal magnetic head (2041) which faces the piston connecting rod (201) is provided with a metal magnetic core (2042), the outer surface of the metal magnetic core (2042) is wound with an electromagnetic coil (2043), and the power supply device (2044) is provided with a power supply interface (2045) which extends to the outside of the piston connecting rod (201). The electromagnetic coil (2043) and the power supply device (2044) are electrically connected with the silicon controlled regulator (205), and the current of the electromagnetic coil (2043) can be controlled by the silicon controlled regulator (205).

4. The device for dosing DNA staining solution according to claim 3, characterized in that: The outer surface of the piston connecting rod (201) is provided with a damping mechanism (4), and the outer surface of the damping mechanism (4) is in contact with the inner wall of the liquid taking cylinder (1).

5. The device for dosing DNA staining solution according to claim 3, characterized in that: ​ ​ 6. The device for dosing DNA staining solution according to claim 3, characterized in that: ​ 7. The device for dosing DNA staining solution according to claim 6, characterized in that: The damping mechanism (4) comprises a support disc (401), the side of the support disc (401) is provided with a plurality of damping beads (402), the damping beads (402) have elasticity, and the outer surface of the damping beads (402) is in contact with the inner wall of the liquid taking cylinder (1).

8. The device for dosing DNA staining solution according to claim 7, characterized in that: The inside of the support disc (401) is provided with a plurality of telescopic cavities (4011) which are distributed in the circumferential array of the shaft center of the support disc (401), the inside of all the telescopic cavities (4011) is provided with elastic members (4012), and each of the elastic members (4012) applies a pushing force to the corresponding damping bead (402) in the direction of the inner wall of the liquid taking cylinder (1).

9. The device for dosing DNA staining solution according to claim 8, characterized in that: The telescopic cavity (4011) is a conical circular groove, the damping bead (402) is a ball, and the outer surface of the damping bead (402) extends to the outer surface of the support disc (401), and the inner diameter of the end of the telescopic cavity (4011) which faces the inner wall of the liquid taking cylinder (1) is smaller than the diameter of the damping bead (402).

10. The device for dosing DNA staining solution according to claim 8, characterized in that: The damping bead (402) can roll in the inside of the telescopic cavity (4011).

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