CN114405693A

CN114405693A - Drive shaft, rotor and centrifuge thereof

Info

Publication number: CN114405693A
Application number: CN202111455553.2A
Authority: CN
Inventors: 张德鹏; 阳方义
Original assignee: Rwd Life Science Co ltd
Current assignee: Rwd Life Science Co ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-04-29

Abstract

An embodiment of the present invention provides a drive shaft, including: a drive shaft body including a first groove; the bolt is accommodated in the first groove; the spring is accommodated in the first groove, and two ends of the spring are respectively connected with the driving shaft body and the lock tongue; the part of the lock tongue extends out of the first groove under the action of the spring, and the rotor is locked on the driving shaft body in the axial direction; the drive shaft body still includes first through-hole, and the spring bolt still includes the second through-hole, and first through-hole and the at least partial coincidence of projection of second through-hole in drive shaft body axial, external force act on the spring bolt through first through-hole and second through-hole, and the spring bolt is compressed spring under the effect of external force, contracts to first recess, and the rotor is from the unblock on the drive shaft body. The embodiment of the invention has simple and effective operation and high reliability, reduces the operation burden of experimenters, and avoids the occurrence of safety accidents caused by insufficient locking.

Description

Drive shaft, rotor and centrifuge thereof

Technical Field

The invention relates to the technical field of centrifuges, in particular to a driving shaft, a rotor and a centrifuge thereof.

Background

The centrifugal machine is an instrument for separating biological samples and is widely applied to the fields of life science, medical treatment, chemistry, environmental protection and the like. Typically, the rotor is secured to a drive shaft by a threaded connection and a motor rotates the drive shaft and thus the rotor for centrifugal operation. Such a connection mode needs the laboratory technician to use the instrument to twist several rings and just can ensure that rotor and drive shaft lock together, and complex operation is complicated. If the rotor is not screwed in place, the rotor may loosen and fly out of the cavity of the centrifuge during high-speed rotation, thereby causing safety accidents.

Disclosure of Invention

The embodiment of the invention provides a driving shaft, and aims to solve the problems of complex operation and low reliability in locking and unlocking a rotor and the driving shaft in the prior art.

In a first aspect, there is provided a drive shaft comprising:

a drive shaft body (1), the drive shaft body (1) comprising a first recess (11);

the bolt (2), the bolt (2) is accommodated in the first groove (11); and

the spring (3) is accommodated in the first groove (11), and two ends of the spring (3) are respectively connected with the driving shaft body (1) and the bolt (2);

wherein the bolt (2) partially extends out of the first groove (11) under the action of the spring (3); drive shaft body (1) still includes first through-hole (12), and spring bolt (2) still includes second through-hole (21), and first through-hole (12) and second through-hole (21) are at least partly coincide in drive shaft body (1) axial ascending projection, and external force acts on spring bolt (2) through first through-hole (12) and second through-hole (21), and spring bolt (2) compress spring (3) under the effect of external force, retract to first recess (11).

In a second aspect, a rotor is provided, comprising a second groove (6) arranged in a central axis of the rotor; when the driving shaft enters the central shaft of the rotor and the bolt (2) partially extends out of the first groove (11) and enters the second groove (6), the driving shaft and the rotor are locked.

In a third aspect, there is provided a centrifuge comprising a motor, a centrifuge chamber, a rotor as described above and a drive shaft; the driving shaft penetrates through the bottom of the centrifuge cavity, and the rotor is positioned in the centrifuge cavity and locked on the driving shaft; the motor drives the driving shaft to rotate for centrifugal operation.

In the embodiment of the invention, the lock tongue is arranged in the first groove of the driving shaft body, the part of the lock tongue extends out of the first groove under the action of the spring, and the rotor is locked on the driving shaft body in the axial direction; external force exerts horizontal effort to the spring bolt through the second through-hole on the spring bolt for the spring bolt reverse compression spring, the spring bolt is retracted and is reached first recess, and the rotor is followed the unblock on the drive shaft body, and is easy and simple to handle effective, and the reliability is high, has alleviateed experimenter's operation burden, has avoided the condition because of locking not in place emergence incident.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a drive shaft provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a drive shaft provided in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a rotor and drive shaft lock provided in accordance with a second embodiment of the present invention;

FIG. 4 is a partial cross-sectional view of a rotor and drive shaft lock provided in accordance with a second embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of the rotor and drive shaft unlocking provided by a second embodiment of the present invention;

FIG. 6 is a schematic view of a centrifuge provided in the third embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar modules or modules having the same or similar functionality throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

The centrifugal operation is a common operation in a laboratory and needs to be frequently carried out, the locking between the rotor and the driving shaft is not complicated, otherwise, the locking between the rotor and the driving shaft is not in place due to omission or negligence in the complicated operation of an experimenter, and safety accidents are easily caused.

Example one

Fig. 1 is a schematic view of a drive shaft according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of a drive shaft according to an embodiment of the present invention. For centrifugation, the tube (not shown) containing the biological sample to be centrifuged is placed in a rotor (not shown) which is then locked to a drive shaft which is rotated to effect centrifugation.

Referring to fig. 1 and 2, the driving shaft includes a driving shaft body 1, a latch 2, and a spring 3. The outer surface of the drive shaft body 1 includes a cylindrical surface 13 and a truncated conical surface 14. A first groove 11 is formed in the side face and the cylindrical surface 13 of the driving shaft body 1, and the bolt 2 and the spring 3 are accommodated in the first groove 11. The two ends of the spring 3 are respectively connected with the inner wall of the driving shaft body 1 and the bolt 2. Alternatively, it may be an adhesive fixed connection. When no external force is applied, the bolt 2 partially extends out of the first groove 11 under the action of the spring 3 to clamp the rotor matched with the driving shaft, the cylindrical surface 13 is positioned between the bolt 2 and the truncated cone surface 14, and the bolt 2 and the truncated cone surface 14 lock the rotor on the driving shaft body 1 in the axial direction. In the embodiment of the present invention, the upper surface of the bolt 2 extending out of the first groove 11 is configured as an arc surface or an inclined surface. The central shaft of rotor is overlapped on the drive shaft by the experimenter, and when the rotor contacted with this cambered surface or inclined plane, its gravity reversely pressed the spring bolt 2 back to first recess 11, in the drive shaft got into the central shaft of rotor, when the spring bolt 2 stretched out first recess 11 again under the effect of spring 3 and got into the recess of rotor central shaft, can send "clatter"'s locking prompt tone, showed that rotor and drive shaft have been in the locking state. The locking operation is simple, convenient and effective, and the experimenter is not easy to miss or neglect in the operation. Further, the lower surface of the latch bolt 2 protruding the first groove 11 is provided as a plane. The trend of upward movement when the rotor rotates can not easily push the bolt 2 back to the first groove 11, and the locking reliability is high.

In order to balance and stabilize the locking force when the rotor and the driving shaft are locked, a plurality of lock tongues 2 are uniformly arranged about the axis of the driving shaft body 1.

In the embodiment of the present invention, the drive shaft body 1 further includes a first through hole 12 coaxial therewith. The first through hole 12 is provided in the top surface of the drive shaft body 1, penetrating from the top surface of the drive shaft body 1 to the first recess 11. The bolt 2 further comprises a second through hole 21. The second through hole 21 moves as the latch bolt 2 moves during locking and unlocking. However, the projections of the first through hole 12 and the second through hole 21 in the axial direction of the drive shaft body 1 at least partially overlap in the range of movement. Preferably, the axis of the first through hole 12 passes through the second through hole 21 when the rotor and the drive shaft are locked. External force transversely acts on the bolt 2 through the first through hole 12 and the second through hole 21, and the bolt 2 reversely compresses the spring 3 under the action of the external force and retracts to the first groove 11.

In the embodiment of the present invention, the movement of the bolt 2 to extend out of the first groove 11 and retract into the first groove 11 is a translational movement. The bolt 2 partially translates and extends out of the first groove 11 under the action of the spring 3; the spring 3 is reversely compressed under the action of external force, and is horizontally retracted to the first groove 11, so that the whole structure is simple, and the requirement on the processing precision of parts is not high.

In the embodiment of the present invention, the driving shaft further includes a first pin 4 fixed to the driving shaft body 1, and the bolt 2 further includes a third through hole 22. The diameter of the third through hole 22 is larger than that of the first pin 4, and the first pin 4 passes through the third through hole 22 to limit the translational motion of the bolt 2. The spring 3 is arranged to remain in compression in the locked condition of the rotor and the drive shaft so that the extent to which the bolt 2 protrudes out of the first recess 11 is determined by the difference in diameter between the first pin 4 and the third through hole 22. When the bolt 2 stretches out of the first groove 11 to lock the rotor, the spring 3 still provides large locking force, so that the bolt 2 is not easy to reversely compress the spring 3 due to centrifugal operation after clamping the rotor, and mistaken unlocking is caused. Meanwhile, only the spring 3 needs to be placed between the inner wall of the driving shaft body 1 and the bolt 2, and the installation of the spring 3 is simplified.

In an embodiment of the invention, the drive shaft further comprises a second pin 5 fixed to the drive shaft body 1. The second pin 5 and the first pin 4 are uniformly arranged about the axis of the drive shaft body 1. The first pin 4 and the second pin 5 protrude from the top surface of the drive shaft body 1. When the rotor is locked to the driving shaft, the first pin 4 and the second pin 5 are inserted into the grooves in the top of the central shaft of the rotor, so that the rotor and the driving shaft are prevented from moving relatively, the rotor and the driving shaft can be guaranteed to rotate integrally, and the positioning of the rotating direction is guaranteed.

Example two

Fig. 3 is a cross-sectional view of a rotor and a drive shaft lock provided in a second embodiment of the present invention. Fig. 4 is a partial cross-sectional view of a rotor and drive shaft lock provided in accordance with a second embodiment of the present invention. Fig. 5 is a partial sectional view of the rotor and the drive shaft unlocking provided by the second embodiment of the present invention. In the embodiment of the present invention, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and all the features described in the first embodiment are included, and are not described again.

Referring to fig. 3, 4 and 5, the rotor includes a rotor body 8 and a rotor cover 9, and the housing chamber 81 of the rotor body 8 is closed by the rotor cover 9. The central shaft of the rotor is a hollow structure, and the inner wall of the rotor is provided with a second groove 6. When the driving shaft enters the central shaft of the rotor and the bolt 2 partially extends out of the first groove 11 and enters the second groove 6 as described in the first embodiment, the bolt 2 and the truncated cone surface 14 lock the rotor on the driving shaft body 1 in the axial direction, and the driving shaft and the rotor are locked.

In the present embodiment, the rotor further comprises a thimble 7. When locked, the projections of the first through hole 12 and the second through hole 21 in the axial direction of the drive shaft body 1 are at least partially overlapped. When unlocking, the thimble 7 is inserted into the first through hole 12 and the second through hole 21, and transverse acting force is applied to the bolt 2, so that the bolt 2 reversely compresses the spring 3, the bolt 2 retracts to the first groove 11, and the driving shaft and the rotor are unlocked. Compared with the unlocking mode that the second groove 6 of the bolt 2 and the rotor are matched by the inclined planes, the unlocking mode is simple, convenient and effective in operation, and the rotor is not easy to block so as to cause unlocking failure.

Preferably, for ease of positioning, the thimble 7 is of symmetrical construction, comprising a tip and a cylindrical body. The tip is located on the axis of the first through hole 12 and the diameter of the cylindrical body is comparable to the diameter of the first through hole 12. When locked, the axis of the first through hole 12 passes through the second through hole 21. When unlocking, the thimble 7 is inserted into the first through hole 12, the tip thereof first enters the second through hole 21, and then the cylindrical body enters the second through hole 21. In the process, the thimble 7 applies transverse acting force to the bolt 2, so that the bolt 2 reversely compresses the spring 3, the bolt 2 is separated from the second groove 6 and retracts to the first groove 11.

As an embodiment of the present invention, the thimble 7 is provided on the rotor cover 9. The experimenter presses the thimble 7, and the thimble 7 is inserted into the first through hole 12 and the second through hole 21 when receiving external force, and the bolt 2 retracts to the first groove 11. When the experimenter releases the thimble 7, the thimble 7 is not forced to exit the first through hole 12 and the second through hole 21 under the action of a spring or other mechanisms, and the bolt 2 partially extends out of the first groove 11. As another embodiment of the present invention, the thimble 7 may be an independent component. When the rotor and the driving shaft need to be unlocked, an experimenter inserts the thimble 7 into the first through hole 12 and the second through hole 21; when the rotor and the driving shaft do not need to be unlocked, the experimenter properly stores the thimble 7.

The rotor of the embodiment of the invention is matched with the driving shaft of the first embodiment, so that the rotor and the driving shaft can be easily locked and unlocked. A lock tongue is arranged in a first groove of the driving shaft body, the lock tongue partially extends out of the first groove under the action of a spring, and the rotor is locked on the driving shaft body in the axial direction; external force exerts horizontal effort to the spring bolt through the second through-hole on the spring bolt for the spring bolt reverse compression spring, the spring bolt is retracted and is reached first recess, and the rotor is followed the unblock on the drive shaft body, and is easy and simple to handle effective, and the reliability is high, has alleviateed experimenter's operation burden, has avoided the condition because of locking not in place emergence incident.

EXAMPLE III

FIG. 6 is a schematic view of a centrifuge provided in the third embodiment of the present invention. As shown in fig. 6, the centrifuge includes a motor, a centrifuge chamber, a rotor as described in embodiment two, and a drive shaft as described in embodiment one.

In an embodiment of the invention, the drive shaft passes through the bottom of the centrifuge chamber and is connected to the central shaft of the rotor, which is located within the centrifuge chamber, to lock the rotor to the drive shaft. The tube (not shown) containing the biological sample to be centrifuged is then placed in the rotor, the centrifuge door is closed so that the rotor is located in the sealed centrifuge chamber, and the motor drives the drive shaft to rotate for centrifugation.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A drive shaft, comprising:

a bolt (2), wherein the bolt (2) is accommodated in the first groove (11); and

wherein the bolt (2) partially extends out of the first groove (11) under the action of the spring (3); the driving shaft body (1) further comprises a first through hole (12), the lock tongue (2) further comprises a second through hole (21), the first through hole (12) and the second through hole (21) are in at least partial coincidence of the projection of the driving shaft body (1) in the axial direction, external force acts on the lock tongue (2) through the first through hole (12) and the second through hole (21), and the lock tongue (2) compresses the spring (3) under the action of the external force and retracts to the first groove (11).

2. The drive shaft according to claim 1, characterized in that the bolt (2) is partially translated out of the first recess (11) under the action of the spring (3); the spring bolt (2) compresses the spring (3) under the action of external force, and the spring bolt is retracted to the first groove (11) in a translation mode.

3. The drive shaft according to claim 1, further comprising a first pin (4) fixed to the drive shaft body (1), the bolt (2) further comprising a third through hole (22); the first pin (4) penetrates through the third through hole (22) to limit the movement of the lock tongue (2).

4. The drive shaft according to claim 3, further comprising a second pin (5) fixed to the drive shaft body (1), the second pin (5) and the first pin (4) being uniformly arranged with respect to the axis of the drive shaft body (1).

5. The drive shaft according to any of claims 1 to 4, characterized in that the locking tongue (2) is in plurality.

6. The drive shaft according to any of claims 1 to 4, characterized in that the outer surface of the drive shaft body (1) comprises a cylindrical surface (13) and a truncated cone surface (14); when the bolt (2) partially extends out of the first groove (11), the cylindrical surface (13) is positioned between the bolt (2) and the truncated cone surface (14).

7. A rotor, characterized by comprising a second groove (6) arranged in the central axis of the rotor; the drive shaft according to any of the claims 1-6 enters the central shaft of the rotor, and the drive shaft and the rotor are locked when the bolt (2) partly protrudes out of the first recess (11) into the second recess (6).

8. The rotor as recited in claim 7, characterized in that it further comprises a thimble (7), said thimble (7) is inserted into said first through hole (12) and said second through hole (21), and a force is applied to said bolt (2) to make said bolt (2) compress said spring (3), said bolt (2) retracts to said first groove (11), and said drive shaft and said rotor are unlocked.

9. The rotor as recited in claim 8, further comprising a rotor body (8) and a rotor cover (9), the housing cavity (81) of the rotor body (8) being closed by the rotor cover (9); the thimble (7) is arranged on the rotor cover (9), is inserted into the first through hole (12) and the second through hole (21) when being subjected to external force, and is withdrawn from the first through hole (12) and the second through hole (21) when not being subjected to the external force.

10. A centrifuge comprising a motor, a centrifuge chamber, a rotor according to any of claims 7-9 and a drive shaft according to any of claims 1-6;

the drive shaft penetrates through the bottom of the centrifuge cavity, and the rotor is positioned in the centrifuge cavity and locked on the drive shaft; the motor drives the driving shaft to rotate for centrifugal operation.