A driving shaft, a rotor and a centrifuge thereof

Abstract

The embodiment of the present invention provides a driving shaft, comprising: a driving shaft body, the driving shaft body comprising a first groove; a locking tongue, the locking tongue being accommodated in the first groove; and a spring, the spring being accommodated in the first groove, and the two ends of the spring being respectively connected to the driving shaft body and the locking tongue; the locking tongue partially extends out of the first groove under the action of the spring, and locks the rotor on the driving shaft body in the axial direction; the driving shaft body further comprises a first through hole, the locking tongue further comprises a second through hole, the projections of the first through hole and the second through hole in the axial direction of the driving shaft body at least partially overlap, an external force acts on the locking tongue through the first through hole and the second through hole, the locking tongue compresses the spring under the action of the external force, retracts to the first groove, and the rotor is unlocked from the driving shaft body. The embodiment of the present invention is simple and effective to operate, has high reliability, reduces the operating burden of the experimenter, and avoids the situation of safety accidents caused by inadequate locking.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuges, and in particular to a driving shaft, a rotor and a centrifuge thereof. Background Art

[0002] Centrifuges are instruments used to separate biological samples and are widely used in life sciences, medicine, chemistry, environmental protection and other fields. Usually, the rotor is fixed to the drive shaft through a threaded connection, and the motor drives the drive shaft to rotate and then drives the rotor to rotate for centrifugal operation. This connection method requires the experimenter to use tools to tighten several turns to ensure that the rotor and the drive shaft are locked together, which is cumbersome and complicated. If it is not tightened properly, the rotor may become loose when rotating at high speed and fly out of the centrifuge cavity, causing a safety accident. Summary of the invention

[0003] An embodiment of the present invention provides a drive shaft, aiming to solve the problems in the prior art that the locking and unlocking of a rotor and a drive shaft are complicated and cumbersome and the reliability is low.

[0004] In a first aspect, a drive shaft is provided, comprising:

[0005] A drive shaft body (1), the drive shaft body (1) comprising a first groove (11);

[0006] A locking tongue (2), the locking tongue (2) being received in the first groove (11); and

[0007] A spring (3), the spring (3) being accommodated in the first groove (11), and having two ends respectively connected to the drive shaft body (1) and the locking tongue (2);

[0008] The locking tongue (2) partially extends out of the first groove (11) under the action of the spring (3); the drive shaft body (1) further includes a first through hole (12), and the locking tongue (2) further includes a second through hole (21); 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; an external force acts on the locking tongue (2) through the first through hole (12) and the second through hole (21); the locking tongue (2) compresses the spring (3) under the action of the external force and retracts into the first groove (11).

[0009] In a second aspect, a rotor is provided, comprising a second groove (6) arranged on the central axis of the rotor; when the drive shaft as described above enters the central axis of the rotor and the locking tongue (2) partially extends out of the first groove (11) and enters the second groove (6), the drive shaft and the rotor are locked.

[0010] In a third aspect, a centrifuge is provided, comprising a motor, a centrifuge chamber, a rotor as described above, and a drive shaft; the drive shaft passes through the bottom of the centrifuge chamber, the rotor is located in the centrifuge chamber, and is locked on the drive shaft; the motor drives the drive shaft to rotate to perform centrifugal operation.

[0011] In the embodiment of the present invention, a locking tongue is arranged in the first groove of the drive shaft body. Under the action of the spring, the locking tongue partially extends out of the first groove, and locks the rotor on the drive shaft body in the axial direction; the external force applies a lateral force to the locking tongue through the second through hole on the locking tongue, so that the locking tongue reversely compresses the spring, and the locking tongue retracts to the first groove, and the rotor is unlocked from the drive shaft body. The operation is simple and effective, the reliability is high, the operating burden of the experimenter is reduced, and the safety accidents caused by inadequate locking are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0013] Figure 1 is a schematic diagram of a drive shaft provided in Embodiment 1 of the present invention;

[0014] Figure 2 is a cross-sectional view of a drive shaft provided in Embodiment 1 of the present invention;

[0015] Figure 3 is a cross-sectional view of the rotor and the drive shaft locked according to the second embodiment of the present invention;

[0016] Figure 4 is a partial cross-sectional view of the locking of the rotor and the drive shaft provided in the second embodiment of the present invention;

[0017] Figure 5 is a partial cross-sectional view of the rotor and the drive shaft unlocked according to the second embodiment of the present invention;

[0018] Figure 6 It is a schematic diagram of a centrifuge provided in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar modules or modules with the same or similar functions. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0020] Centrifugation operation is a common and frequently performed operation in the laboratory. The locking between the rotor and the drive shaft should not be too complicated. Otherwise, the experimenter may miss or neglect to lock the rotor and the drive shaft properly during the complicated operation, which may easily cause safety accidents.

[0021] In the embodiment of the present invention, a locking tongue is arranged in the first groove of the drive shaft body. Under the action of the spring, the locking tongue partially extends out of the first groove, and locks the rotor on the drive shaft body in the axial direction; the external force applies a lateral force to the locking tongue through the second through hole on the locking tongue, so that the locking tongue reversely compresses the spring, and the locking tongue retracts to the first groove, and the rotor is unlocked from the drive shaft body. The operation is simple and effective, the reliability is high, the operating burden of the experimenter is reduced, and the safety accidents caused by inadequate locking are avoided.

[0022] Embodiment 1

[0023] Figure 1 It is a schematic diagram of a drive shaft provided in Embodiment 1 of the present invention. Figure 2 It is a cross-sectional view of the drive shaft provided in Example 1 of the present invention. When performing a centrifugal operation, a test tube (not shown in the figure) containing a biological sample to be centrifuged is placed in a rotor (not shown in the figure), and then the rotor is locked on the drive shaft, and the drive shaft rotates to perform a centrifugal operation.

[0024] Combination Figure 1 and Figure 2 , the drive shaft includes a drive shaft body 1, a locking tongue 2 and a spring 3. The outer surface of the drive shaft body 1 includes a cylindrical surface 13 and a truncated cone surface 14. A first groove 11 is provided on the side surface and the cylindrical surface 13 of the drive shaft body 1, and the locking tongue 2 and the spring 3 are accommodated in the first groove 11. The two ends of the spring 3 are respectively connected to the inner wall of the drive shaft body 1 and the locking tongue 2. Optionally, it can be connected by bonding. When there is no external force, the locking tongue 2 partially extends out of the first groove 11 under the action of the spring 3, clamping the rotor matching the drive shaft, and the cylindrical surface 13 is located between the locking tongue 2 and the truncated cone surface 14, and the locking tongue 2 and the truncated cone surface 14 lock the rotor on the drive shaft body 1 in the axial direction. In an embodiment of the present invention, the upper surface of the locking tongue 2 extending out of the first groove 11 is set as an arc surface or an inclined surface. The experimenter sleeves the central axis of the rotor on the drive shaft. When the rotor contacts the arc surface or the inclined surface, its gravity presses the lock tongue 2 back into the first groove 11, and the drive shaft enters the central axis of the rotor. When the lock tongue 2 extends out of the first groove 11 again under the action of the spring 3 and enters the groove of the central axis of the rotor, a "click" locking prompt sound is emitted, indicating that the rotor and the drive shaft are in a locked state. The locking operation is simple and effective, and the experimenter is not likely to make omissions or negligence during operation. Furthermore, the lower surface of the lock tongue 2 extending out of the first groove 11 is set as a plane. The upward movement tendency of the rotor during rotation will not easily press the lock tongue 2 back into the first groove 11, and the locking reliability is high.

[0025] In order to balance and stabilize the locking force when the rotor and the drive shaft are locked, there are multiple locking tongues 2 that are evenly arranged about the axis of the drive shaft body 1.

[0026] In an embodiment of the present invention, the drive shaft body 1 also includes a first through hole 12 coaxial therewith. The first through hole 12 is arranged on the top surface of the drive shaft body 1, and passes through from the top surface of the drive shaft body 1 to the first groove 11. The lock tongue 2 also includes a second through hole 21. During the locking and unlocking process, the second through hole 21 moves with the movement of the lock tongue 2. However, within the range of movement, 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. Preferably, when the rotor and the drive shaft are locked, the axis of the first through hole 12 passes through the second through hole 21. The external force acts laterally on the lock tongue 2 through the first through hole 12 and the second through hole 21, and the lock tongue 2 reversely compresses the spring 3 under the action of the external force and retracts to the first groove 11.

[0027] In the embodiment of the present invention, the movement of the lock tongue 2 extending out of the first groove 11 and retracting into the first groove 11 is a translational movement. The lock tongue 2 partially translates out of the first groove 11 under the action of the spring 3; under the action of an external force, the spring 3 is reversely compressed and translated back into the first groove 11. The overall structure is simple and the machining accuracy requirements for parts are not high.

[0028] In an embodiment of the present invention, the drive shaft further includes a first pin 4 fixed to the drive shaft body 1, and the lock tongue 2 further includes a third through hole 22. The diameter of the third through hole 22 is greater than the diameter of the first pin 4, and the first pin 4 passes through the third through hole 22 to limit the translational movement of the lock tongue 2. The spring 3 is set to be in a compressed state when the rotor and the drive shaft are locked, so that the extent to which the lock tongue 2 extends out of the first groove 11 is determined by the difference in diameter between the first pin 4 and the third through hole 22. When the lock tongue 2 extends out of the first groove 11 to lock the rotor, the spring 3 still provides a large locking force, so that after the lock tongue 2 is stuck in the rotor, it is not easy to reversely compress the spring 3 due to centrifugal operation, causing mis-locking. At the same time, the spring 3 only needs to be placed between the inner wall of the drive shaft body 1 and the lock tongue 2, which simplifies the installation of the spring 3.

[0029] In the embodiment of the present invention, the drive shaft further includes a second pin 5 fixed to the drive shaft body 1. The second pin 5 and the first pin 4 are evenly 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 drive shaft, the first pin 4 and the second pin 5 are inserted into the groove at the top of the rotor center axis to prevent the rotor and the drive shaft from relative movement, ensure that the two can rotate as a whole, and ensure the positioning of the rotation direction.

[0030] In the embodiment of the present invention, a locking tongue is arranged in the first groove of the drive shaft body. Under the action of the spring, the locking tongue partially extends out of the first groove, and locks the rotor on the drive shaft body in the axial direction; the external force applies a lateral force to the locking tongue through the second through hole on the locking tongue, so that the locking tongue reversely compresses the spring, and the locking tongue retracts to the first groove, and the rotor is unlocked from the drive shaft body. The operation is simple and effective, the reliability is high, the operating burden of the experimenter is reduced, and the safety accidents caused by inadequate locking are avoided.

[0031] Embodiment 2

[0032] Figure 3 It is a cross-sectional view of the locked rotor and drive shaft provided in the second embodiment of the present invention. Figure 4 It is a partial cross-sectional view of the locking of the rotor and the drive shaft provided in the second embodiment of the present invention. Figure 5 1 is a partial cross-sectional view of the unlocking of the rotor and the drive shaft provided in the second embodiment of the present invention. In the embodiment of the present invention, the same components as those in the first embodiment use the same reference numerals as those in the first embodiment, including all the features described in the first embodiment, which will not be described again.

[0033] Combination Figure 3 , Figure 4 and Figure 5 The rotor includes a rotor body 8 and a rotor cover 9, and the receiving cavity 81 of the rotor body 8 is closed by the rotor cover 9. The central axis of the rotor is a hollow structure, and a second groove 6 is provided on its inner wall. As described in the first embodiment, when the drive shaft enters the central axis of the rotor, and the locking tongue 2 partially extends out of the first groove 11 and enters the second groove 6, the locking tongue 2 and the truncated cone surface 14 lock the rotor on the drive shaft body 1 in the axial direction, and the drive shaft and the rotor are locked.

[0034] In the embodiment of the present invention, the rotor further includes a pin 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 at least partially overlap. When unlocked, the pin 7 is inserted into the first through hole 12 and the second through hole 21, and a lateral force is applied to the lock tongue 2, so that the lock tongue 2 reversely compresses the spring 3, and the lock tongue 2 retracts to the first groove 11, and the drive shaft and the rotor are unlocked. Compared with the unlocking method in which the lock tongue 2 and the second groove 6 of the rotor are matched with an inclined surface, the unlocking operation described above is simple and effective, and it is not easy to get the rotor stuck and cause it to be unable to unlock.

[0035] Preferably, in order to facilitate positioning, the ejector pin 7 is a symmetrical structure, including 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 equivalent to the diameter of the first through hole 12. When locking, the axis of the first through hole 12 passes through the second through hole 21. When unlocking, the ejector pin 7 is inserted into the first through hole 12, and its tip first enters the second through hole 21, and then the cylindrical body enters the second through hole 21. In this process, the ejector pin 7 applies a lateral force to the lock tongue 2, so that the lock tongue 2 reversely compresses the spring 3, and the lock tongue 2 disengages from the second groove 6 and retracts to the first groove 11.

[0036] As one embodiment of the present invention, the ejector pin 7 is arranged on the rotor cover 9. The experimenter presses the ejector pin 7, and the ejector pin 7 is inserted into the first through hole 12 and the second through hole 21 when subjected to an external force, and the locking tongue 2 retracts to the first groove 11. The experimenter releases the ejector pin 7, and the ejector pin 7 withdraws from the first through hole 12 and the second through hole 21 under the action of a spring or other mechanism when not subjected to an external force, and the locking tongue 2 partially extends out of the first groove 11. As another embodiment of the present invention, the ejector pin 7 may also be an independent component. When it is necessary to unlock the rotor and the drive shaft, the experimenter inserts the ejector pin 7 into the first through hole 12 and the second through hole 21; when it is not necessary to unlock the rotor and the drive shaft, the experimenter properly stores the ejector pin 7.

[0037] The rotor of the embodiment of the present invention cooperates with the drive shaft of the first embodiment to easily lock and unlock the rotor and the drive shaft. A locking tongue is arranged in the first groove of the drive shaft body, and the locking tongue partially extends out of the first groove under the action of the spring, locking the rotor on the drive shaft body in the axial direction; the external force applies a lateral force to the locking tongue through the second through hole on the locking tongue, so that the locking tongue reversely compresses the spring, and the locking tongue retracts to the first groove, and the rotor is unlocked from the drive shaft body. The operation is simple and effective, with high reliability, reducing the operating burden of the experimenter and avoiding safety accidents caused by inadequate locking.

[0038] Embodiment 3

[0039] Figure 6 Schematic diagram of a centrifuge provided in Embodiment 3 of the present invention. Figure 6 As shown, the centrifuge includes a motor, a centrifuge chamber, the rotor described in the second embodiment, and the drive shaft described in the first embodiment.

[0040] In the embodiment of the present invention, the drive shaft passes through the bottom of the centrifuge chamber and is connected to the central axis of the rotor, the rotor is locked on the drive shaft, and the rotor is located in the centrifuge chamber. Then, a test tube (not shown in the figure) containing a biological sample to be centrifuged is placed in the rotor, the door cover of the centrifuge is closed, so that the rotor is located in the sealed centrifuge chamber, and the motor drives the drive shaft to rotate to perform centrifugal operation.

[0041] In the embodiment of the present invention, a locking tongue is arranged in the first groove of the drive shaft body. Under the action of the spring, the locking tongue partially extends out of the first groove, and locks the rotor on the drive shaft body in the axial direction; the external force applies a lateral force to the locking tongue through the second through hole on the locking tongue, so that the locking tongue reversely compresses the spring, and the locking tongue retracts to the first groove, and the rotor is unlocked from the drive shaft body. The operation is simple and effective, the reliability is high, the operating burden of the experimenter is reduced, and the safety accidents caused by inadequate locking are avoided.

[0042] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A drive shaft, characterized in that: include: A drive shaft body (1), the drive shaft body (1) comprising a first groove (11); a locking tongue (2), the locking tongue (2) being received in the first groove (11); and a spring (3), the spring (3) being accommodated in the first groove (11), with two ends of the spring being respectively connected to the drive shaft body (1) and the locking tongue (2); Wherein, under the action of the spring (3), the locking tongue (2) partially translates and extends out of the first groove (11); the drive shaft body (1) further comprises a first through hole (12), and the locking tongue (2) further comprises a second through hole (21); 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, and an external force acts on the locking tongue (2) through the first through hole (12) and the second through hole (21); under the action of the external force, the locking tongue (2) compresses the spring (3) and translates and retracts to the first groove (11); The drive shaft further comprises a first pin (4) fixed to the drive shaft body (1), and the locking tongue (2) further comprises a third through hole (22); the diameter of the third through hole (22) is greater than the diameter of the first pin (4), and the first pin (4) passes through the third through hole (22) to limit the movement of the locking tongue (2).

2. The drive shaft according to claim 1, characterized in that: It also comprises a second pin (5) fixed to the drive shaft body (1), wherein the second pin (5) and the first pin (4) are evenly arranged with respect to the axis of the drive shaft body (1).

3. The drive shaft according to claim 1 or 2, 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 locking tongue (2) partially extends out of the first groove (11), the cylindrical surface (13) is located between the locking tongue (2) and the truncated cone surface (14).

4. A rotor, characterized in that: The invention comprises a second groove (6) arranged on the central axis of the rotor; when the drive shaft according to any one of claims 1 to 3 enters the central axis of the rotor and the locking tongue (2) partially extends out of the first groove (11) and enters the second groove (6), the drive shaft and the rotor are locked.

5. The rotor according to claim 4, characterized in that It also comprises a push pin (7), wherein the push pin (7) is inserted into the first through hole (12) and the second through hole (21), and applies a force to the lock tongue (2) so that the lock tongue (2) compresses the spring (3), and the lock tongue (2) retracts into the first groove (11), thereby unlocking the drive shaft and the rotor.

6. The rotor according to claim 5, characterized in that It also comprises a rotor body (8) and a rotor cover (9), wherein the receiving cavity (81) of the rotor body (8) is closed by the rotor cover (9); the ejector pin (7) is arranged on the rotor cover (9), is inserted into the first through hole (12) and the second through hole (21) when subjected to external force, and is withdrawn from the first through hole (12) and the second through hole (21) when not subjected to external force.

7. A centrifuge, characterized in that: comprising a motor, a centrifuge chamber, a rotor as claimed in any one of claims 4 to 6, and a drive shaft as claimed in any one of claims 1 to 3; The drive shaft passes through the bottom of the centrifuge cavity, the rotor is located in the centrifuge cavity and locked on the drive shaft; the motor drives the drive shaft to rotate to perform centrifugal operation.

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