CN212596451U

CN212596451U - Centrifuge rotor

Info

Publication number: CN212596451U
Application number: CN202020638263.6U
Authority: CN
Inventors: 甘信元; 李正生; 李键辉; 滕培坤; 杨霆
Original assignee: Qingdao Haier Biomedical Co Ltd; Qingdao Haite Biomedical Co Ltd
Current assignee: Qingdao Haier Biomedical Co Ltd; Qingdao Haite Biomedical Co Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-02-26
Anticipated expiration: 2030-04-24

Abstract

The utility model relates to a centrifuge rotor, include: the handle is detachably and fixedly connected with the first locking element, and the tail end of the first locking element is provided with a reducing end part; the connecting component is sleeved on the outer side of the first locking element; the connecting assembly moves between a first position and a second position; a first shaft pin and a second shaft pin which vertically extend downwards along the mounting direction of the rotor are fixedly arranged on the connecting assembly; a closure assembly comprising a first closure member and a second closure member; when the connecting assembly is in the first position, the distal ends of the first and second locking elements extend outwardly from the outer surface of the connecting assembly; when the connecting assembly is located at the second position, the reducing end extends into a position between the first locking element and the second locking element, the tail ends of the first locking element and the second locking element are in contact with the outer surface of the reducing end, and the far end of the first locking element and the far end of the second locking element are retracted into the connecting assembly. The utility model provides a centrifuge rotor can accomplish fast and get and put, need not the extra operation of user.

Description

Centrifuge rotor

Technical Field

The utility model belongs to the technical field of centrifuge, especially, relate to a centrifuge rotor.

Background

The centrifuge rotor is mounted on a centrifuge. Such centrifuges are used primarily in laboratories for research in the fields of medicine, pharmacy, biology, and chemistry to separate components of a sample using mass inertia. The rotor of the centrifuge needs to be rotated at high speed, the sample containers are arranged on the rotor in different ways, and the sample to be centrifuged is stored in the sample container and rotated. The rotor is driven to rotate by a motor.

The requirements of different experiments are met for processing different analysis samples. The rotor needs to be frequently disassembled. The rotor designed in the prior art can be connected with a motor rotating shaft through a specific clamping structure, and self-locking of the rotor is realized. This snap-in structure is mainly divided into two parts, namely a mounting sleeve formed on the rotor and two vertically extending connecting elements in the form of pins formed on the drive head and a coupling element provided on the drive head, as disclosed in chinese patent application (CN 102176975B): "if the rotor is to be connected to the drive head, the rotor is moved from top to bottom in the direction of the drive head. The sleeve mounted on the rotor touches the corresponding outer edge of the coupling element with its truncated cone, and the coupling element is pressed forward by a stop by means of a compression spring. By lowering the sleeve with its truncated cone onto the edges, the coupling element is deflected such that the respective outer edge overlaps the surface line of the drive head. The elongate portion of each coupling element is deflected in the direction of the axis of rotation against the spring force of the compression spring. If the rotor is to be removed from the sleeve, it is necessary to move an actuating element vertically downwards along the axis of rotation by means of a resiliently pretensioned pushbutton, the actuating element having a conical end which acts on a coupling tooth of the coupling element, the conical end exerting a force perpendicular to the axis of rotation, so that the coupling element can be deflected until the outer edge again overlaps the busbar or even continues to move inwards into the drive head, at which point the rotor can be pulled upwards again and removed from the drive head. Although this structure can achieve the connection between the rotor and the motor and achieve self-locking, there are two problems, firstly, the unlocking must rely on the key connected with the operation element, that is, the user must perform manual operation when removing the rotor; secondly, connecting element and coupling element all set up on the drive head, because coupling element all confirms its operating position through the pressure spring, change the back many times, take place to warp easily, must be maintained by operating personnel and change. If the centrifuge is in the process of a continuous experiment, the centrifuge must be temporarily replaced to ensure that the experiment continues.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.

Disclosure of Invention

The utility model discloses to the problem that the rotor unblock must rely on the button of being connected with operating element among the prior art, design and provide one kind and can realize quick replacement's centrifuge rotor.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

a centrifuge rotor comprising: the handle is detachably and fixedly connected with a first locking element, the first locking element vertically extends along the mounting direction of the rotor, a reducing end part is formed at the tail end of the first locking element, the reducing end part is provided with a first reducing end and a second reducing end, the first reducing end and the second reducing end are sequentially distributed along the mounting direction of the rotor, and the diameter of the first reducing end is smaller than that of the second reducing end; the connecting component is sleeved on the outer side of the first locking element; the connection assembly moves between a first position and a second position relative to the first locking element; the connecting assembly is fixedly provided with a first shaft pin and a second shaft pin, and the first shaft pin and the second shaft pin vertically extend downwards along the mounting direction of the rotor; the locking assembly comprises a first locking element and a second locking element which are symmetrically arranged, wherein the first locking element rotates around the first axis pin, and the second locking element rotates around the second axis pin; when the connection assembly is in the first position, the distal ends of the first and second closure elements extend outwardly from the outer surface of the connection assembly; when the connecting assembly is located at the second position, the reducing end extends into a position between the first locking element and the second locking element, and the tail end of the first locking element and the tail end of the second locking element are in contact with the outer surface of the reducing end so as to rotate around the first shaft pin and the second shaft pin respectively until the far end of the first locking element and the far end of the second locking element are flush with the outer surface of the connecting assembly or retract into the connecting assembly.

Further, the connection assembly includes: the connecting sleeve is sleeved outside the first locking element; when the connection assembly is in the first position, the upper surface of the connection sleeve is in contact with the handle, and when the connection assembly is in the second position, the upper surface of the connection sleeve is separated from the handle.

Further, the first locking element comprises a first connecting part, the first spring is sleeved on the first connecting part, and the connecting sleeve is sleeved outside the first spring; the first spring has first end and the second end that distributes in proper order along rotor installation direction, the connecting sleeve upper end forms the annular end plate of inside extension, the lower terminal surface of annular end plate with the first end contact of first spring.

Further, the connection assembly further includes: the rotor inner core is connected with the connecting sleeve; a first limiting clamping groove and a second limiting clamping groove are formed in the rotor inner core; when the connecting assembly is in the first position, the far end of the first locking element extends out of the first limiting clamping groove, and the far end of the second locking element extends out of the second limiting clamping groove.

Further, the first locking element further comprises: the rotor inner core is sleeved outside the second connecting part; and an annular stopper portion formed between the first connection portion and the second connection portion; the annular limiting part extends outwards from the outer surface of the first locking element, and the upper end face of the annular limiting part is in contact with the second end of the first spring.

Further, when the connecting assembly is located at the first position, the lower end surface of the annular limiting part is in contact with the upper surface of the rotor inner core; when the connecting assembly is located at the second position, the lower end face of the annular limiting portion is separated from the upper surface of the rotor inner core.

Further, a first connecting end plate extending outwards is formed at the lower end of the connecting sleeve, and a second connecting end plate extending outwards is formed on the outer end face of the rotor inner core; the first connection end plate and the second connection end plate are bolted.

Further, the method also comprises the following steps: the first fixing block is fixedly arranged in the rotor inner core and is connected with the head end of the first locking element through a second spring; the second fixing block is fixedly arranged in the rotor inner core and is connected with the head end of a second locking element through a third spring; when the connecting assembly is located at the first position, the second spring and the third spring are located in an uncompressed state, the far end of the first locking element extends out of the first limiting clamping groove, and the far end of the second locking element extends out of the second limiting clamping groove.

Further, the first locking element further comprises a third connecting part, and the third connecting part is positioned between the second connecting part and the diameter-variable end part; when the connecting assembly is in the second position, the third connecting portion is located between the first and second latch elements; the outer diameters of the first connecting portion, the second connecting portion and the third connecting portion are decreased progressively in sequence.

Further, the handle is connected with the first connecting portion through bolts.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

the utility model provides a centrifuge rotor, at the in-process of installation and dismantlement, the user only need mention the handle, relative movement through coupling assembling and first locking component, make to form and can withdraw from or stretch into between first locking component and the second locking component at the terminal reducing tip of first locking component, drive first locking component and second locking component stretch out or retract to coupling assembling from coupling assembling's surface, thereby can install the rotor in the corresponding installation site of drive head or motor and realize the locking. The user does not need to perform additional operations in the whole process. Meanwhile, the centrifuge rotor is integrated into an independent component, so that the adaptability is better.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of one embodiment of a centrifuge rotor of the present disclosure, wherein the coupling assembly is in a first position relative to the first locking element;

FIG. 2 is a schematic structural view of the centrifuge rotor shown in FIG. 1 with the connection assembly in a second position relative to the first locking element;

FIG. 3 is a cross-sectional view of the centrifuge rotor shown in FIG. 1 in an installed condition;

FIG. 4 is a top view of the rotor core of FIG. 1;

fig. 5 is a schematic structural view of the first locking element of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Must carry out manually operation's problem among the installation of centrifuge rotor among the prior art and the dismantlement process, the utility model relates to a provide a modified centrifuge rotor, this kind of centrifuge rotor can realize quick installation and dismantlement to user need not to carry out manually operation completely at the in-process of installation and dismantlement. The internal structure of the centrifuge rotor will be described in detail below with reference to the accompanying drawings. As shown in fig. 1 to 3, the centrifuge rotor 1 is mainly composed of a handle 10, a first locking element 11, a connecting assembly 12, and a locking assembly. The handle 10 is mainly convenient for a user to take and place the rotor, and the handle 10 is detachably and fixedly connected with the first locking element 11. The first locking member 11 has a substantially rod shape, which extends vertically in the rotor mounting direction. As shown in fig. 5, the end of the first locking element 11 is specially designed with a reducing end portion 36, the reducing end portion 36 having a first reducing end 46 and a second reducing end 47. The first and second

variable diameter ends

46 and 47 are sequentially distributed in the rotor mounting direction, and the diameter of the first variable diameter end 46 is smaller than that of the second variable diameter end 47. As shown in fig. 3 and 5, in the present embodiment, the variable diameter end portion 36 is designed to be a continuous conical shape as a whole; in some alternative embodiments, the variable diameter end portion 36 may be designed in other shapes, such as a continuous flat-topped hemisphere, etc., which satisfies the form that the first variable diameter end 46 with a smaller diameter and the second variable diameter end 47 with a larger diameter are sequentially distributed along the rotor installation direction. The function of the reducing end 36 will be described in more detail below.

The connecting assembly 12 is sleeved outside the first locking element 11. The connecting assembly 12 is movable relative to the first locking element 11 between a first position P1 and a second position P2, and when the connecting assembly 12 is in the first position P1 or the second position P2, the relative positions of the connecting assembly 12, the first locking element 11 and the locking assembly are changed, so that the locking assembly can be locked and connected with the corresponding motor structure of the centrifuge, even of different models of centrifuges. Specifically, the connecting assembly 12 is fixedly provided with a first shaft pin 13 and a second shaft pin 14, and the first shaft pin 13 and the second shaft pin 14 extend vertically downward in the rotor mounting direction. In correspondence with the first 13 and second 14 axis pins, the closure assembly further comprises a first 15 and a second 16 closure element, symmetrically arranged. The first closure member 15 and the second closure member 16 are generally crescent shaped and define a proximal end (shown as 48 and 49 in fig. 4) adjacent the inner side and a distal end adjacent the outer side. Wherein the first locking element 15 rotates around the first axle pin 13 and the second locking element 16 rotates around the second axle pin 14. As a whole, the first locking element 15 and the second locking element 16 are integrated in the rotor. When connecting assembly 12 is in first position P1 with respect to first locking element 11, distal end 25 of first closure element 15 and distal end 26 of second closure element 16 extend outwardly from the outer surface of connecting assembly 12. When the connecting assembly 12 is in the second position P2, the reducing end 36 extends between the first locking element 15 and the second locking element 16, and due to the difference in diameter between the upper end and the lower end of the reducing end 36, the tail end 37 of the first locking element 15 and the tail end 38 of the second locking element 16 contact the outer surface of the reducing end 36 and are pressed by the outer surface of the reducing end 36, so that the first locking element 15 and the second locking element 16 rotate inward around the first axis pin 13 and the second axis pin 14, respectively, until the distal end 25 of the first locking element 15 and the distal end 26 of the second locking element 16 are flush with the outer surface of the connecting assembly 12 or are retracted into the connecting assembly 12.

The mounting and dismounting process of the corresponding centrifuge rotor 1 is specifically described as follows: before mounting, the centrifuge rotor 1 is placed on a table or a corresponding platform, the connecting assembly 12 is in the first position P1 relative to the first locking element 11, the variable-diameter end 36 is located below the first locking element 15 and the second locking element 16, without pressing the first locking element 15 and the second locking element 16. The distal end 25 of the first closure element 15 and the distal end 26 of the second closure element 16 extend outwardly from the outer surface of the connecting assembly 12. If the user wishes to mount the centrifuge rotor 1, the entire centrifuge rotor 1 is lifted by holding the handle 10. Due to the effect of gravity, the connecting assembly 12 is moved downwards relative to the first locking element 11. In contrast, if the connecting assembly 12 is used as a frame of reference, the first locking element 11 is moved upwards. In this case, the variable-diameter end 36 extends between the first locking element 15 and the second locking element 16. Due to the different diameters of the two ends of the variable diameter end 36, the tail end 37 of the first locking element 15 and the tail end 38 of the second locking element 16 are in contact with the outer surface of the variable diameter end 36 and are pressed by the outer surface of the variable diameter end 36, so that the second locking element 16 of the first locking element 15 rotates inwards around the first axis pin 13 and the second axis pin 14 respectively, and the distal end 25 of the first locking element 15 and the distal end 26 of the second locking element 16 are flush with the outer surface of the connecting assembly 12 or are retracted into the connecting assembly 12. In this state, the maximum value of the overall outer diameter of the centrifuge rotor 1 is the outer diameter of the connecting component 12, and the centrifuge rotor 1 can be placed in the corresponding mounting structure of the driving head 2 or the motor. When the corresponding mounting structure of the drive head 2 or the motor provides sufficient holding force, the connecting assembly 12 will return to the first position P1 relative to the first locking element 11, the tapered end 36 is withdrawn from between the first locking element 15 and the second locking element 16, and the first locking element 15 and the second locking element 16 are reset, extend outward and snap or abut into the corresponding mounting structure of the drive head 2 or the motor, thereby achieving locking.

When the rotor is to be removed, the user merely has to lift the grip handle 10 and the first locking element 11 is moved upwards. In contrast, if the first locking element 11 is taken as a frame of reference, the connecting assembly 12 is moved downwards. The reducing end 36 extends between the first locking element 15 and the second locking element 16, the outer surface of the reducing end 36 presses the tail end 37 of the first locking element 15 and the tail end 38 of the second locking element 16 to rotate the second locking element 16 of the first locking element 15 inwardly around the first pivot pin 13 and the second pivot pin 14, respectively, and the distal end 25 of the first locking element 15 and the distal end 26 of the second locking element 16 are flush with the outer surface of the connecting assembly 12 or are retracted into the connecting assembly 12. The centrifuge rotor 1 can be removed from the drive head 2 or the corresponding mounting structure of the motor.

The utility model provides a centrifuge rotor 1, in the in-process of installation and dismantlement, the user only need mention handle 10, through coupling assembling 12 and the relative movement of first locking component 11, make the reducing tip 36 that forms at first locking component 11 end can withdraw from or stretch into between first locking component 15 and the second locking component 16, drive first locking component 15 and second locking component 16 from coupling assembling 12's surface stretch out or retract to coupling assembling 12 in, thereby can install the rotor in the corresponding installation site of driving head 2 or motor and realize the locking. The user does not need to perform additional operations in the whole process. At the same time, the centrifuge rotor 1 is integrated as a separate component, with a better degree of adaptation.

The structure of the connection assembly 12 is further described below. The coupling assembly 12 mainly comprises two parts, a coupling sleeve 17 and a rotor core 22. The container for storing the reagent may be fixedly connected to the connection sleeve 17 in various ways such as integrally formed, snap-fit, etc. The connecting sleeve 17 is arranged on the outside of the first locking element 11, and the connecting sleeve 17 slides along the first locking element 11. When the connecting assembly 12 is in the first position P1, the upper surface 18 of the connecting sleeve 17 is in contact with the handle 10. When linkage assembly 12 is in second position P2. The upper surface 18 of the connecting sleeve 17 is separated from the handle 10. The return of the coupling sleeve 17 is preferably effected by the restoring force of the first spring 19, and the first locking element 11 is formed with a first connection 33 at a position corresponding to the coupling sleeve 17. The first spring 19 is sleeved on the first connecting portion 33, and the connecting sleeve 17 is sleeved outside the first spring 19. The first spring 19 has a first end 20 and a second end 29 distributed in sequence in the rotor mounting direction. The upper end of the connecting sleeve 17 forms an inwardly extending annular end plate 21, the lower end surface of the annular end plate 21 being in contact with the first end 20 of the first spring 19. When the connecting sleeve 17 is moved downwards, the lower end surface of the annular end plate 21 presses the first end 20 of the first spring 19, and the first spring 19 is compressed. When a sufficient holding force is formed below, the first spring 19 is reset, and at the same time, the connecting sleeve 17 is moved upward and reset.

The rotor inner core 22 is detachably and fixedly connected with the connecting sleeve 17, and an optional structure is as follows: the lower end of the connecting sleeve 17 forms a first connecting end plate 30 extending outwards, the outer end face of the rotor inner core 22 forms a second connecting end plate 31 extending outwards, and the first connecting end plate 30 and the second connecting end plate 31 are connected through bolts. The rotor core 22 is fitted over the second connection 34 of the first locking element 11. The second connection 34 is clearance fitted with the rotor core 22 to achieve relatively stable sliding. More specifically, the first shaft pin 13 and the second shaft pin 14 are respectively provided on the rotor core 22 and extend downward, and the rotor core 22 is provided therein with a first fixing block 43 and a second fixing block 44. The first fastening block 43 is fixedly arranged on the inner wall of the rotor core 22, and the first fastening block 43 is connected to the head end 39 of the first locking element 15 via the second spring 41. Similarly, a second fixed block 44 is also fixedly disposed on the inner wall of the rotor core 22, and the second fixed block 44 is connected to the head end 40 of the second locking element 16 through a third spring 42. The rotor inner core 22 is provided with a first limiting clamping groove 23 and a second limiting clamping groove 24. The first and second limit stop recesses 23, 24 are shaped to match the first and

second locking elements

15, 16. When connecting assembly 12 is in first position P1, second spring 41 and third spring 42 are in an uncompressed state, distal end 25 of first locking element 15 protrudes from first positive stop notch 23, and distal end 26 of second locking element 16 protrudes from second positive stop notch 24. When the connecting assembly 12 is in the second position P2, the first and

second latch elements

15 and 16 rotate inward, and the second and

third springs

41 and 42 are in a compressed state.

An annular stopper portion 27 is also formed on the first locking member 11. An annular stopper portion 27 is formed between the first connecting portion 33 and the second connecting portion 34, the annular stopper portion 27 extending outwardly from the outer surface of the first locking member 11. The upper end surface of the annular stopper portion 27 contacts the second end 29 of the first spring 19 to support the first spring 19. When connecting assembly 12 is in first position P1, the lower end surface of annular stopper portion 27 is in contact with the upper surface of rotor core 22, and when connecting assembly 12 is in second position P2, the lower end surface of annular stopper portion 27 is separated from the upper surface of rotor core 22. In the installed state, the height of the connection assembly 12 may be maintained to a relatively low level, which may facilitate reducing the overall height and size of the centrifuge.

A specially designed first locking element 11 will be further described with reference to fig. 5. As shown, the first locking element 11 includes a first connection portion 33, a second connection portion 34, a third connection portion 35, and a variable diameter end portion 36 formed in this order in the rotor installation direction. Wherein the diameter of the third connecting portion 35 is the smallest, when the connecting assembly 12 is at the second position P2, the third connecting portion 35 is located between the first locking element 15 and the second locking element 16, and the third connecting portion 35 is tangential to or spaced apart from the rear end 37 of the first locking element 15 and the rear end 38 of the second locking element 16, and presses the first locking element 15 or the second locking element 16. The diameter of the second connecting portion 34 is preferably designed to be the same as the diameter of the variable diameter end portion 36 in order to maintain the structural strength of the entire first locking element 11. As shown in fig. 5, the handle 10 is bolted to the first connection portion 33, and preferably, the first connection portion 33 is formed with an external thread 45.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims

1. A centrifuge rotor, comprising:

the handle is detachably and fixedly connected with a first locking element, the first locking element vertically extends along the mounting direction of the rotor, a reducing end part is formed at the tail end of the first locking element, the reducing end part is provided with a first reducing end and a second reducing end, the first reducing end and the second reducing end are sequentially distributed along the mounting direction of the rotor, and the diameter of the first reducing end is smaller than that of the second reducing end;

the connecting component is sleeved on the outer side of the first locking element; the connection assembly moves between a first position and a second position relative to the first locking element; the connecting assembly is fixedly provided with a first shaft pin and a second shaft pin, and the first shaft pin and the second shaft pin vertically extend downwards along the mounting direction of the rotor; and

the locking assembly comprises a first locking element and a second locking element which are symmetrically arranged, wherein the first locking element rotates around the first axis pin, and the second locking element rotates around the second axis pin; when the connection assembly is in the first position, the distal ends of the first and second closure elements extend outwardly from the outer surface of the connection assembly; when the connecting assembly is located at the second position, the reducing end extends into a position between the first locking element and the second locking element, and the tail end of the first locking element and the tail end of the second locking element are in contact with the outer surface of the reducing end so as to rotate around the first shaft pin and the second shaft pin respectively until the far end of the first locking element and the far end of the second locking element are flush with the outer surface of the connecting assembly or retract into the connecting assembly.

2. The centrifuge rotor of claim 1 wherein,

the connecting assembly includes:

the connecting sleeve is sleeved outside the first locking element; when the connection assembly is in the first position, the upper surface of the connection sleeve is in contact with the handle, and when the connection assembly is in the second position, the upper surface of the connection sleeve is separated from the handle.

3. The centrifuge rotor of claim 2 wherein,

the first locking element comprises a first connecting part, a first spring is sleeved on the first connecting part, and the connecting sleeve is sleeved on the outer side of the first spring;

the first spring has first end and the second end that distributes in proper order along rotor installation direction, the connecting sleeve upper end forms the annular end plate of inside extension, the lower terminal surface of annular end plate with the first end contact of first spring.

4. The centrifuge rotor of claim 3 wherein,

the connection assembly further includes:

the rotor inner core is connected with the connecting sleeve; a first limiting clamping groove and a second limiting clamping groove are formed in the rotor inner core; when the connecting assembly is in the first position, the far end of the first locking element extends out of the first limiting clamping groove, and the far end of the second locking element extends out of the second limiting clamping groove.

5. The centrifuge rotor of claim 4 wherein,

the first locking element further comprises:

the rotor inner core is sleeved outside the second connecting part; and

an annular stopper portion formed between the first connection portion and the second connection portion; the annular limiting part extends outwards from the outer surface of the first locking element, and the upper end face of the annular limiting part is in contact with the second end of the first spring.

6. The centrifuge rotor of claim 5 wherein,

when the connecting assembly is located at the first position, the lower end face of the annular limiting part is in contact with the upper surface of the rotor inner core; when the connecting assembly is located at the second position, the lower end face of the annular limiting portion is separated from the upper surface of the rotor inner core.

7. The centrifuge rotor of claim 6 wherein,

a first connecting end plate extending outwards is formed at the lower end of the connecting sleeve, and a second connecting end plate extending outwards is formed on the outer end face of the rotor inner core;

the first connection end plate and the second connection end plate are bolted.

8. The centrifuge rotor of any of claims 5 to 7,

further comprising:

the first fixing block is fixedly arranged in the rotor inner core and is connected with the head end of the first locking element through a second spring;

the second fixing block is fixedly arranged in the rotor inner core and is connected with the head end of a second locking element through a third spring;

when the connecting assembly is located at the first position, the second spring and the third spring are located in an uncompressed state, the far end of the first locking element extends out of the first limiting clamping groove, and the far end of the second locking element extends out of the second limiting clamping groove.

9. The centrifuge rotor of claim 8 wherein,

the first locking element further comprises a third connecting part, and the third connecting part is positioned between the second connecting part and the diameter-variable end part; when the connecting assembly is in the second position, the third connecting portion is located between the first and second latch elements;

the outer diameters of the first connecting portion, the second connecting portion and the third connecting portion are decreased progressively in sequence.

10. The centrifuge rotor of claim 9 wherein,

the handle is connected with the first connecting part through a bolt.