CN115069428A

CN115069428A - Centrifugal machine

Info

Publication number: CN115069428A
Application number: CN202210655582.1A
Authority: CN
Inventors: 薄旭峰; 李喜瑞; 苏志明; 耿进朝
Original assignee: Zhengzhou Keda Machinery Equipment Co ltd
Current assignee: Zhengzhou Keda Machinery Equipment Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-09-20
Anticipated expiration: 2042-06-10
Also published as: CN115069428B

Abstract

The invention relates to a centrifuge, which is improved on a rotor and a main shaft in the prior art, the lower end of a rotating shaft matched with the rotor and the main shaft is provided with a round hole, a connecting shaft is axially arranged in the round hole, the connecting shaft and the round hole are matched with each other through a sliding chute and a sliding block in an axial sliding way, a spring is arranged between the connecting shaft and the rotating shaft, the connecting shaft is inserted into an insertion hole arranged on the main shaft, the side wall of the insertion hole is provided with continuous clamping grooves and limiting grooves, the rotation of the main shaft is realized by utilizing the matching of clamping pins, the clamping grooves and the limiting grooves to drive the rotating shaft to rotate, meanwhile, the position for storing test tubes is changed through a lead screw, so that the centrifugal force is changed, the operation is very simple and convenient, the installation work of the rotor can be realized only by pressing and rotating at a small angle, meanwhile, the placing position of the test tubes on the rotor can be flexibly adjusted according to the requirement of the centrifugal force, and the pressure difference locking work is carried out on the test tubes by utilizing the pressure of gas in an air cylinder, is safe and reliable.

Description

Centrifugal machine

Technical Field

The invention belongs to the technical field of biochemical reaction instruments, and particularly relates to a centrifugal machine.

Background

Centrifuges are machines that utilize centrifugal force to separate components of a mixture of liquid and solid particles or liquid and liquid. The centrifuge is mainly used for separating solid particles from liquid in suspension, or separating two liquids which have different densities and are insoluble with each other in emulsion (for example, cream is separated from milk); it can also be used to remove liquids from wet solids, such as by spin drying clothes in a washing machine; the special overspeed tubular separator can also separate gas mixtures with different densities; some settling centrifuges can also grade solid particles according to density or granularity by utilizing the characteristic that solid particles with different densities or granularities have different settling speeds in liquid. The desk centrifuge is an essential tool in the separation and preparation work of a laboratory, and is a special instrument for separating and precipitating a mixed solution by utilizing centrifugal force and used for collecting cell debris of microbial strains, large cell organelles, precipitates and the like.

The existing centrifuge generally needs to be screwed when a rotor is installed, which is very troublesome, the installation and the removal are very troublesome, the positions of the test tubes on each rotor are fixed, the centrifugal force is in direct proportion to the distance between the test tube and the center of the rotating shaft, therefore, the centrifugal force can be adjusted by adjusting the position of the centrifugal tube on the rotor, the fixation of the test tube storage positions on the existing rotor is improved, and therefore, a centrifuge is needed to be urgently needed to solve the problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a centrifuge, which is used for solving the problems that the rotor of the existing centrifuge is troublesome to install and the storage position of test tubes on the rotor is fixed and cannot be flexibly adjusted according to the requirement of centrifugal force.

The technical purpose of the invention is realized by the following technical scheme:

the centrifugal machine comprises a machine case, a rotor and a controller and is characterized in that a case cover is hinged to the upper end of the machine case, a slow-speed supporting and opening device is arranged between the case cover and the machine case to slowly open the case cover and support the case cover, a control panel is arranged on the machine case, a centrifugal cavity is formed in the upper end of the machine case, a main shaft rotates in the centrifugal cavity and is driven to rotate by a rotating device arranged in the machine case, and a temperature control device is arranged in the machine case to control the temperature in the centrifugal cavity;

the test tube storage device is connected to the upper end of the moving block, the test tube storage device is used for storing test tubes, a round hole is formed in the lower end of the rotating shaft, a connecting shaft is coaxially and vertically connected in the round hole in a sliding mode, two groups of chutes with impermeable lower ends are axially formed in the inner side wall of the round hole, a sliding block in sliding fit with the chutes is connected to the connecting shaft, a spring is connected between the upper end of the connecting shaft and the inner bottom surface of the round hole, and clamping pins in radial arrangement are circumferentially and uniformly connected to the lower end of the connecting shaft;

the upper end of the main shaft is provided with a jack matched with the diameter of the connecting shaft, the side wall of the jack is provided with two groups of L-shaped clamping grooves matched with the clamping pins, the upper end of each clamping groove is open, the end part of each clamping groove is communicated with a vertically arranged limiting groove arranged on the side wall of the jack, and the limiting groove is matched with the clamping pins;

the control panel, the rotating device and the temperature control device are electrically connected with the controller.

Preferably, the fixed block upper end open and to have the cross-section to be the resettlement groove of T shape, the movable block lower extreme be provided with the cross-section for the structure of T shape and with resettlement groove sliding fit, radial adjusting device include along the radial setting of axis of rotation and rotate the lead screw of connection in the resettlement groove, the lead screw thread wears to establish the movable block and is connected with the knob at the end.

Preferably, test tube strorage device including connecting the trapezoidal piece in the movable block upper end, the slope inclined plane of trapezoidal piece set up towards axis of rotation axle center direction slope, trapezoidal piece upper end test tube storage cylinder, be connected with test tube adsorption equipment on the test tube storage cylinder, satisfy and adsorb the arrangement to the test tube in the test tube storage cylinder.

Preferably, the test tube adsorption device comprises an air inlet pipe arranged in the test tube storage cylinder, the other end of the air inlet pipe is communicated with an air cylinder arranged on the side wall of the test tube storage cylinder, a piston is axially and slidably connected in the air cylinder, a piston rod arranged in the air cylinder is connected to the piston, a screwing nut is connected to the end of the piston rod, and the screwing nut is in threaded fit outside the air cylinder.

Preferably, the one end that the test tube storage cylinder was arranged in to the intake pipe be connected with test tube bottom complex rubber ring.

Preferably, the upper end of the case is provided with two groups of rectangular holes, the case cover is connected with two groups of rectangular blocks matched with the rectangular holes, the rectangular blocks are connected with magnets, and the rectangular holes are internally provided with opposite magnets matched with the magnets.

Preferably, the slow speed support opening device comprises a damper rotatably connected to the upper end of the case, and the other end of the damper is rotatably connected to the case cover.

The invention has the beneficial effects that: the invention improves the rotor and the main shaft in the prior art, the lower end of a rotating shaft matched with the rotor and the main shaft is provided with a round hole, a connecting shaft is axially arranged in the round hole, the connecting shaft and the round hole are matched in an axial sliding way through the matching of a sliding chute and a sliding block, a spring is arranged between the connecting shaft and the rotating shaft, the connecting shaft is inserted into an inserting hole arranged on the main shaft, the side wall of the inserting hole is provided with a continuous clamping groove and a limiting groove, the rotating of the main shaft is realized by the matching of a clamping pin and the clamping groove and the limiting groove to drive the rotating shaft to rotate, and the position for storing a test tube is changed through a lead screw, so that the centrifugal force is changed, the operation of the invention is very simple and convenient, the complicated process of installing the rotor by using a knob is not needed, the installation work of the rotor can be realized only by pressing and small-angle rotation, and meanwhile, the placing position of the test tube on the rotor can be flexibly adjusted according to the requirement of the centrifugal force, the pressure of the gas in the inflator is utilized to lock the pressure difference of the test tube, the centrifugal test tube is safe and reliable in the centrifugal process, and the centrifugal test tube is high in practicability and suitable for popularization and use.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a perspective view angle two of the present invention.

Fig. 3 is a front view of the present invention.

Fig. 4 is a top view of the present invention with the cover removed.

Fig. 5 is a perspective view showing the engagement of the rotor and the main shaft according to the present invention.

Fig. 6 is a perspective view of a rotor according to the present invention.

Fig. 7 is a cross-sectional view of the rotor and spindle of the present invention in engagement.

Fig. 8 is a perspective view of the coupling shaft and the main shaft of the present invention.

Fig. 9 is a perspective view showing a screw and a connecting portion thereof according to the present invention.

FIG. 10 is a perspective view of the test tube storage apparatus according to the present invention.

In the figure, 1, a chassis; 2. a rotor; 3. a box cover; 4. a control panel; 5. a centrifugal chamber; 6. a main shaft; 7. a rotating shaft; 8. a fixed block; 9. a moving block; 10. a circular hole; 11. a connecting shaft; 12. a chute; 13. a slider; 14. a spring; 15. a bayonet lock; 16. a jack; 17. a card slot; 18. a limiting groove; 19. a placing groove; 20. a lead screw; 21. a knob; 22. a trapezoidal block; 23. a test tube storage cylinder; 24. an air inlet pipe; 25. an air cylinder; 26. a piston; 27. a piston rod; 28. a knob nut; 29. a rubber ring; 30. a rectangular hole; 31. a rectangular block; 32. a damper.

Detailed Description

The following description of the present invention will be made in detail with reference to the accompanying drawings 1 to 10.

In the first embodiment, the centrifugal machine comprises a machine case 1, a rotor 2 and a controller, wherein a case cover 3 is hinged to the upper end of the machine case 1, a retarding support opening device is arranged between the case cover 3 and the machine case 1 to realize slow opening of the case cover 3 and support of the case cover 3, a control panel 4 is arranged on the machine case 1, the control panel 4 controls the centrifugal temperature of the centrifugal machine and adjusts the rotating speed of the rotor 2, the control panel 4 is in man-machine interaction with a user, two groups of rectangular blocks 31 matched with rectangular holes 30 are connected to the case cover 3, magnets are connected to the rectangular blocks 31, opposite magnets matched with the magnets are arranged in the rectangular holes 30, the case cover 3 is adsorbed by the magnets and the opposite magnets after being closed, so that the case cover 3 is closed, the retarding support opening device comprises a damper 32 rotatably connected to the upper end of the machine case 1, the other end of the damper 32 is rotatably connected to the case cover 3, in the process of opening the box cover 3, the damper 32 slowly lifts the box cover 3 and supports the box cover 3 at the current position, a centrifugal cavity 5 is formed in the upper end of the case 1, a spindle 6 rotates in the centrifugal cavity 5, the spindle 6 is driven to rotate by a rotating device installed in the case 1, a temperature control device is arranged in the case 1 and controls the temperature in the centrifugal cavity 5, the rotating device can be connected with the spindle 6 by adopting an output shaft of a rotating motor, the temperature control device is also the prior art, and is not described herein again, and the temperature control device is used for controlling and adjusting the centrifugal temperature;

the rotor 2 comprises a rotating shaft 7, a plurality of groups of radially arranged fixed blocks 8 are uniformly distributed and connected at the lower end of the rotating shaft 7 along the circumferential direction, moving blocks 9 are arranged on the fixed blocks 8 in a sliding fit manner along the radial direction of the rotating shaft 7, the radial positions of the moving blocks 9 on the fixed blocks 8 are adjusted by radial adjusting devices connected to the fixed blocks 9 through the fixed blocks 8, a mounting groove 19 with a T-shaped section is formed in the upper end of each fixed block 8, a structure with a T-shaped section is arranged at the lower end of each moving block 9 and is in sliding fit with the mounting groove 19, so that the moving blocks 9 can only move along the radial direction of the rotating shaft 7, each radial adjusting device comprises a lead screw 20 which is radially arranged along the rotating shaft 7 and is rotatably connected in the mounting groove 19, the lead screw 20 penetrates through the moving blocks 9 in a threaded manner and is connected with a knob 21 at the end part, and the lead screw 20 is rotated by screwing the knob 21, because the rotation of the moving block 9 is limited, in the rotation process of the lead screw 20, the moving block 9 can only perform position adjustment in the radial direction, so as to change the distance between the moving block 9 and the center of the rotating shaft 7, so as to adjust the centrifugal force, the upper end of the moving block 9 is connected with a test tube storage device, the test tube storage device is used for storing and processing test tubes, the lower end of the rotating shaft 7 is provided with a round hole 10, a connecting shaft 11 is coaxially and vertically connected in the round hole 10 in a sliding manner, two groups of chutes 12 with the lower ends being not communicated are axially arranged on the inner side wall of the round hole 10, a slide block 13 in sliding fit with the chutes 12 is connected on the connecting shaft 11, a spring 14 is connected between the upper end of the connecting shaft 11 and the inner bottom surface of the round hole 10, so that the connecting shaft 11 can perform relative movement in the vertical direction relative to the rotating shaft 7, and meanwhile, the rotating shaft 7 can rotate together with the connecting shaft 11, the lower end of the connecting shaft 11 is uniformly and circumferentially connected with bayonet pins 15 which are radially arranged;

the upper end of the main shaft 6 is provided with a jack 16 matched with the diameter of the connecting shaft 11, the side wall of the jack 16 is provided with two groups of L-shaped clamping grooves 17 matched with the clamping pins 15, the upper end of the clamping grooves 17 is open, the end part of each clamping groove 17 is communicated with a vertically arranged limiting groove 18 formed in the side wall of the jack 16, each limiting groove 18 is matched with the corresponding clamping pin 15, each clamping groove 17 and each limiting groove 18 form a lightning shape, the clamping pins 15 are matched with the corresponding limiting grooves 18, so that the main shaft 6 is driven by a rotating device to rotate, the connecting shaft 11 is driven to rotate, the whole rotor 2 is driven to rotate, the knob 21 is not required to work, only the clamping pins 15 on the rotor 2 are required to be aligned with the clamping grooves 17 on the main shaft 6 and pressed downwards, the rotor 2 is slightly rotated under the action of the springs 14, the clamping pins 15 can move into the vertical limiting grooves 18 from the clamping grooves 17, and under the action of the whole gravity of the rotor 2, and under the action of the spring 14, the bayonet 15 can be reliably clamped in the limiting groove 18 and rotates along with the rotation of the main shaft 6;

the control panel 4, the rotating device and the temperature control device are all electrically connected with the controller, the controller is made of an integrated circuit chip, the controller is made by adopting the prior art, and no description is given here any more, in the use of the embodiment, firstly, the box cover 3 is opened, the connecting shaft 11 on the rotor 2 is inserted by aligning the jack 16 on the main shaft 6, the bayonet pin 15 on the connecting shaft 11 is aligned with the bayonet slot 17, after reaching the bottom of the bayonet slot 17, the rotor 2 is rotated at a small angle, the bayonet pin 15 reaches the position of the limiting slot 18 and enters the vertically arranged limiting slot 18, and can be reliably clamped in the limiting slot 18 under the action of the whole rotor 2 body and the spring 14, so that the rotation of the main shaft 6 drives the connecting shaft 11 and the rotating shaft 7 to rotate together, and simultaneously, when the rotor 2 is dismounted, only the gravity of the rotor 2 and the elastic force of the spring 14 need to be overcome, pulling the whole rotor 2 upwards to enable the bayonet 15 to reach the uppermost end of the limiting groove 18, rotating the rotor 2 in a reverse direction until the rotor 2 can be smoothly pulled out of the bayonet 17; after the rotor 2 is installed, in the process of needing to adjust the centrifugal force of the test tube, the lead screw 20 can be driven to rotate by rotating the knob 21 on the fixed block 8 on the corresponding side, the rotation of the lead screw 20 drives the movable block 9 to change the position in the radial direction, so that the centrifugal force is changed, after the test tube is placed on the test tube storage device, the box cover 3 is covered, the centrifugal rotating speed and the centrifugal temperature are adjusted to carry out centrifugal work, after the centrifugation is finished, the box cover 3 is opened, the rotor 2 is taken down, meanwhile, cleaning treatment is carried out, and the next use is waited, the operation of the embodiment is very simple and convenient, the complex process of installing the rotor 2 by using the knob 21 is not needed, the installation work of the rotor 2 can be realized only by pressing and rotating at a small angle, meanwhile, the test tube placing position on the rotor 2 can be flexibly adjusted according to the requirement of the centrifugal force, the practicality is strong, is fit for using widely.

In the second embodiment, on the basis of the first embodiment, the test tube storage device includes a trapezoid block 22 connected to the upper end of the moving block 9, an inclined slope of the trapezoid block 22 is inclined toward the axial center of the rotating shaft 7, the test tube storage cylinder 23 at the upper end of the trapezoid block 22, that is, the test tube storage cylinder 23 is also inclined, the inclined slope is the same as that of the test tube storage cylinder on the rotor 2 in the existing centrifuge, and the inclined slope is used for ensuring that no overflow occurs during the centrifugation process, the test tube storage cylinder 23 is connected with a test tube adsorption device which is used for adsorbing and placing the test tube in the test tube storage cylinder 23, the test tube adsorption device includes an air inlet pipe 24 arranged in the test tube storage cylinder 23, the bottom of the test tube storage cylinder 23 is communicated with the air inlet pipe 24, and the other end of the air inlet pipe 24 is communicated with an air cylinder 25 arranged on the side wall of the test tube storage cylinder 23, a piston 26 is axially and slidably connected in the air cylinder 25, a piston 26 rod arranged in the air cylinder 25 is connected on the piston 26, the structure of the air cylinder 25 and the piston 26 is similar to that of a needle cylinder, so that when the volume of air in the air cylinder 25 changes, a test tube can be smoothly locked in the test tube storage cylinder 23 under the action of air pressure difference, the end part of the piston 26 rod is connected with a screwing nut which is in threaded fit with the air cylinder 25, the screwing fit of the screwing nut and the air cylinder 25 is used for adjusting the position of the piston 26, so that the processes of adsorption and non-adsorption of the test tube are realized, one end, arranged in the test tube storage cylinder 23, of the air inlet pipe 24 is connected with a rubber ring 29 matched with the bottom of the test tube, when the test tube is put into the corresponding test tube storage cylinder 23 in the operation of the embodiment, the bottom of the test tube is contacted with the rubber ring 29, so that one end of the air inlet cylinder 25 is sealed, then the screw nut outside the air cylinder 25 is screwed to push the piston 26 outwards, the volume of the air in the air cylinder 25 is increased, the pressure is reduced, the air pressure firmly locks the test tube on the rubber ring 29 at the end part of the air inlet pipe 24, so that the test tube can be reliably placed in the centrifuging process, and after the centrifuging process is finished, the screw nut is screwed inwards, so that the volume in the air cylinder 25 is reduced, and the test tube can be smoothly taken out from the test tube storage cylinder 23.

When the invention is used, firstly, the box cover 3 is opened, the connecting shaft 11 on the rotor 2 is aligned with the jack 16 on the main shaft 6 and inserted, the bayonet 15 on the connecting shaft 11 is aligned with the bayonet 17, the rotor 2 is rotated at a small angle after reaching the bottom of the bayonet 17, the bayonet 15 reaches the position of the limiting groove 18 and enters the vertically arranged limiting groove 18, and under the action of the whole rotor 2 body and the spring 14, the bayonet is reliably clamped in the limiting groove 18, so that the connecting shaft 11 and the rotating shaft 7 are driven to rotate together by the rotation of the main shaft 6, and meanwhile, when the rotor 2 is disassembled, the whole rotor 2 is pulled upwards only by overcoming the gravity of the rotor 2 and the elastic force of the spring 14, so that the bayonet 15 reaches the uppermost end of the limiting groove 18, and the rotor 2 is rotated and reversely rotated until the rotor 2 can be smoothly pulled out of the bayonet 17; after the rotor 2 is installed, in the process of adjusting the centrifugal force of the test tube, the screw rod 20 can be driven to rotate by rotating the knob 21 on the fixing block 8 on the corresponding side, the rotation of the screw rod 20 drives the moving block 9 to change the position in the radial direction, so that the centrifugal force is changed, after the test tube is adjusted, the bottom of the test tube is in contact with the rubber ring 29 after the test tube is placed in the corresponding test tube storage cylinder 23, one end of the air inlet cylinder 25 is sealed, then the screwing nut outside the air inlet cylinder 25 is screwed, the piston 26 is pushed outwards, the volume of the gas in the air inlet cylinder 25 is increased, the pressure is reduced, the test tube is firmly locked on the rubber ring 29 at the end of the air inlet pipe 24 by the air pressure, so that the test tube can be reliably placed in the centrifugal process, after the test tube is placed, the box cover 3 is covered, the centrifugal rotation speed and the centrifugal temperature are adjusted, and the centrifugal work is performed, after centrifugation is finished, the box cover 3 is opened, the nut is screwed inwards, the volume in the air cylinder 25 is reduced, so that test tubes can be taken out from the test tube storage cylinder 23 smoothly, the rotor 2 is taken down, cleaning treatment is carried out simultaneously, and next use is waited.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The centrifugal machine comprises a machine case (1), a rotor (2) and a controller and is characterized in that the upper end of the machine case (1) is hinged with a case cover (3), a slow supporting and opening device is arranged between the case cover (3) and the machine case (1) to slowly open the case cover (3) and support the case cover (3), a control panel (4) is arranged on the machine case (1), a centrifugal cavity (5) is formed in the upper end of the machine case (1), a main shaft (6) rotates in the centrifugal cavity (5), the main shaft (6) is driven to rotate by a rotating device arranged in the machine case (1), and a temperature control device is arranged in the machine case (1) to control the temperature in the centrifugal cavity (5);

the test tube test device is characterized in that the rotor (2) comprises a rotating shaft (7), a plurality of groups of radially arranged fixed blocks (8) are uniformly distributed and connected at the lower end of the rotating shaft (7) along the circumferential direction, moving blocks (9) are arranged on the fixed blocks (8) in a radial sliding fit mode along the rotating shaft (7), the moving blocks (9) adjust the radial positions of the moving blocks (9) on the fixed blocks (8) through radial adjusting devices connected to the fixed blocks (8), a test tube storage device is connected to the upper end of each moving block (9) and used for storing test tubes, round holes (10) are formed in the lower end of the rotating shaft (7), a connecting shaft (11) is coaxially and vertically connected in each round hole (10) in a sliding mode, two groups of chutes (12) with the lower ends being not through are formed in the inner side walls of the round holes (10) along the axial direction, and sliding blocks (13) in sliding fit with the chutes (12) are connected to the connecting shaft (11), a spring (14) is connected between the upper end of the connecting shaft (11) and the inner bottom surface of the round hole (10), and clamping pins (15) which are radially arranged are uniformly distributed and connected at the lower end of the connecting shaft (11) along the circumferential direction;

the upper end of the main shaft (6) is provided with a jack (16) matched with the diameter of the connecting shaft (11), the side wall of the jack (16) is provided with two groups of L-shaped clamping grooves (17) matched with the clamping pins (15), the upper end of each clamping groove (17) is opened, the end part of each clamping groove (17) is communicated with a vertically arranged limiting groove (18) formed in the side wall of the jack (16), and each limiting groove (18) is matched with the clamping pin (15);

the control panel (4), the rotating device and the temperature control device are electrically connected with the controller.

2. The centrifuge as claimed in claim 1, wherein the fixing block (8) is provided at an upper end thereof with a placement groove (19) having a T-shaped cross section, the moving block (9) is provided at a lower end thereof with a structure having a T-shaped cross section and slidably engaged with the placement groove (19), the radial adjusting device comprises a lead screw (20) radially disposed along the rotating shaft (7) and rotatably connected in the placement groove (19), the lead screw (20) is threaded through the moving block (9) and connected at an end thereof with a knob (21).

3. The centrifuge according to claim 1, characterized in that the test tube storage device comprises a trapezoidal block (22) connected to the upper end of the moving block (9), the inclined slope of the trapezoidal block (22) is inclined towards the axis direction of the rotating shaft (7), a test tube storage cylinder (23) is arranged at the upper end of the trapezoidal block (22), and a test tube adsorption device is connected to the test tube storage cylinder (23) to adsorb test tubes in the test tube storage cylinder (23).

4. The centrifuge according to claim 3, wherein the test tube adsorption device comprises an air inlet pipe (24) arranged in the test tube storage cylinder (23), the other end of the air inlet pipe (24) is communicated with an air cylinder (25) arranged on the side wall of the test tube storage cylinder (23), a piston (26) is axially and slidably connected in the air cylinder (25), a piston (26) rod arranged in the air cylinder (25) is connected on the piston (26), and a screw nut is connected to the end of the piston (26) rod and is in threaded fit with the air cylinder (25).

5. The centrifuge according to claim 4, characterized in that the end of the air inlet pipe (24) placed in the test tube storage cylinder (23) is connected with a rubber ring (29) matched with the bottom of the test tube.

6. The centrifuge according to claim 1, characterized in that two sets of rectangular holes (30) are formed in the upper end of the case (1), two sets of rectangular blocks (31) matched with the rectangular holes (30) are connected to the case cover (3), magnets are connected to the rectangular blocks (31), and opposite magnets matched with the magnets are installed in the rectangular holes (30).

7. The centrifuge of claim 1, wherein said slow support opening means comprises a damper (32) rotatably connected to the upper end of the casing (1), and the other end of said damper (32) is rotatably connected to the cover (3).