JPWO2017145642A1 - Rotor and centrifuge - Google Patents

Abstract

Provided are a rotor and a centrifuge that improve the operability of a rotor cover with a simple structure with a small number of parts. The rotor 100 includes a holder outer surface notch 24 parallel to the central axis 90z and a circumferential holder outer surface groove 25 connected to the holder outer surface notch 24 on the outer surface of the nut holder 20 installed in the rotor body 10. A handle inner claw 45 protruding toward the central axis 90z is provided on the inner surface of the handle 40 installed on the cover 30. The handle inner claw 45 is made to face the holder outer surface notch 24, and the handle 40 is inserted into the nut holder 20 in the direction of the central axis 90 z in a phase where the handle inner claw 45 does not interfere with the outer surface of the nut holder 20. By rotating the handle 40 relative to the handle 40, the handle inner claw 45 is caused to enter the holder outer surface groove 25, and the handle 40 is restrained from moving vertically relative to the nut holder 20.

Description

The present invention relates to a rotor and a centrifuge.

Conventionally, in a rotor equipped in a centrifuge (same as a centrifuge) used in the fields of medicine, pharmacy, genetic engineering, etc., in order to improve the operability of the rotor cover, it abuts on the upper surface of the rotor cover. An invention in which, by rotating the handle, the lower surface of the cylinder provided at the center of the rotor cover is pressed against the front surface of the boss provided at the center of the rotor body, and the piston disposed inside the cylinder is moved upward. It is disclosed (for example, see Patent Document 1).

JP 2009-291691 A (page 6-8, FIG. 2)

In the invention disclosed in Patent Document 1, the closed space formed by the rotor cover and the rotor body can be reduced in pressure as the piston moves upward, so that the rotor cover is adsorbed to the rotor body. The rotor cover can be easily and reliably attached to the rotor body with screws. However, since the invention disclosed in Patent Document 1 includes a piston and requires a structure that raises and lowers the piston by rotating the handle, it is simpler to operate and has a simple structure with fewer parts. A rotor was requested.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a rotor capable of improving the operability of the rotor cover with a simple structure having a small number of parts and a centrifuge equipped with such a rotor. .

In order to solve the above problems, the present invention provides a rotor according to the present invention having a rotor body and a rotor cover that covers the rotor body as a configuration described below. An outer surface notch that is formed on an outer surface of the body boss portion and is provided in the axial direction; and a circumferential outer surface groove that is continuous with the outer surface notch, and the rotor cover includes the body boss. The body boss in a state in which the inner claw is formed on the inner surface of the cover cylinder portion and protrudes into the cover cylinder portion, and the inner claw faces the outer notch. When the body boss part and the cover cylinder part rotate relatively in the circumferential direction in a state where the body boss part has entered the cover cylinder part, the part can enter the cover cylinder part. Nail penetrates, relative axial movement between the rotor body and the rotor cover is characterized to be bound. In the rotor according to the present invention, the end face of the body boss part and the end face of the cover tube part are spaced apart from each other with the inner claw facing the outer surface notch, and the inner claw enters the outer surface groove. Adjacent body eye marks and cover eye marks are provided, respectively. In the rotor according to the present invention, a stopper that contacts the outer surface of the body boss portion when the inner claw enters the outer surface groove is provided on the inner surface of the cover tube portion. In the rotor according to the present invention, the outer surface grooves and the inner claws are each plural. The rotor which concerns on this invention WHEREIN: The said outer surface groove | channel is the cyclic | annular form formed over the outer surface perimeter of the said body boss | hub part, It is characterized by the above-mentioned. In the rotor according to the present invention, the predetermined range near the center of the cover tube portion of the inner claw is inclined so as to become thinner as it approaches the center of the cover tube portion. In the rotor according to the present invention, the rotor body includes a cylindrical nut holder installed on an outer surface of the body boss portion, and the rotor cover is replaced with the cover tube portion facing the body boss portion, A cylindrical handle facing the nut holder, wherein the outer cutout and the outer groove are formed on the outer surface of the nut holder instead of the outer surface of the body boss portion, and the inner claw is formed on the cover tube portion Instead of the inner surface of the handle, it is formed on the inner surface of the handle.

In addition, the centrifuge according to the present invention includes a drive unit having a rotation shaft, a rotor body that is installed on the rotation shaft, and a rotor cover that covers the rotor body, in a substantially central portion of the rotor body. Has a body boss portion, and is formed on the outer surface of the body boss portion and is provided with an outer surface notch provided in the axial direction, and a circumferential outer surface groove continuous with the outer surface notch, and the rotor cover includes A cover tube portion facing the body boss portion, an inner claw formed on the inner surface of the cover tube portion and projecting into the cover tube portion, with the inner claw facing the outer surface notch, The body boss portion can enter the cover tube portion, and when the body boss portion and the cover tube portion rotate relatively in the circumferential direction in a state where the body boss portion has entered the cover tube portion, the outer surface groove In the above There invade, relative axial movement between the rotor body and the rotor cover is characterized to be bound. In the centrifuge according to the present invention, the rotor body includes a cylindrical nut holder installed on an outer surface of the body boss portion, and the rotor cover is replaced with the cover tube portion facing the body boss portion, A cylindrical handle facing the nut holder, wherein the outer surface notch and the outer surface groove are respectively formed on the outer surface of the nut holder instead of the outer surface of the body boss portion; Instead of the inner surface of the part, it is formed on the inner surface of the handle.

Since the present invention is configured as described above, the operability of the rotor cover can be improved with a simple structure having a small number of parts.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rotor according to a first embodiment of the present invention. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which demonstrates the rotor which concerns on Embodiment 1 of this invention, Comprising: BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which demonstrates the rotor which concerns on Embodiment 1 of this invention, Comprising: One part is expanded and shown. FIG. 5 is a cross-sectional view illustrating an assembling operation in the rotor according to the first embodiment of the present invention and showing a start time of the assembling operation. FIG. 5 is a cross-sectional view illustrating an assembling operation in the rotor according to the first embodiment of the present invention and showing the end of the assembling operation. FIG. 9 is a perspective view illustrating a modified example of the rotor according to the first embodiment of the present invention, with members separated. It is a perspective view explaining the centrifuge which concerns on Embodiment 2 of this invention. It is sectional drawing which shows a part explaining the centrifuge which concerns on Embodiment 2 of this invention.

Hereinafter, modes for carrying out the invention (hereinafter referred to as “Embodiment 1” and “Embodiment 2”) will be described with reference to the drawings. In addition, this invention is not limited to the form shown in figure. Moreover, in order to avoid the complexity of drawing, description of a one part part or description of a one part code | symbol may be abbreviate | omitted.

[Embodiment 1] (Rotor) FIGS. 1 to 3 illustrate a rotor according to Embodiment 1 of the present invention. FIG. Is a sectional view showing the whole, and FIG. 3 is a sectional view showing an enlarged part. In FIG. 1 to FIG. 3, the rotor 100 includes a rotor body 10 having an annular body concave portion 14 whose upper side is opened, and a rotor cover 30 that covers the body concave portion 14. Hereinafter, each will be described in detail.

(Rotor body) The rotor body 10 includes a body plate portion 12 that forms the bottom of the body recess 14, a body boss portion 11 that forms the inner wall of the body recess 14, and a body flange portion 13 that forms the outer wall of the body recess 14. It has. A plurality of sample insertion holes 15 into which test tubes (not shown) containing samples are inserted are arranged equiangularly on a concentric circle with respect to the central axis 90z near the body flange portion 13 of the body recess 14. Yes. A rotating shaft 91 of a drive unit (same as an electric motor) 90 is fitted into the inner surface of the body boss portion 11, a female screw is formed at the tip of the rotating shaft 91, and a nut 92 is screwed onto the female screw. The inner surface of the body boss portion 11 and the outer surface of the rotary shaft 91 are respectively provided with tapered portions that become thicker downward, so that the body boss portion 11 rotates relative to the rotary shaft 91 when the nut 92 is tightened. Connected impossible. A boss male screw 16 for installing a nut holder 20 to be described later is formed on the outer surface of the body boss portion 11.

(Nut Holder) The nut holder 20 includes a cylindrical holder large-diameter portion 21, a cylindrical holder intermediate-diameter portion 22 having an outer diameter smaller than that of the holder large-diameter portion 21, and a cylinder having an outer diameter smaller than that of the holder intermediate-diameter portion 22. The holder step surface 21c is formed in the boundary of the outer surface side of the holder large diameter part 21 and the holder medium diameter part 22 at the holder small diameter part 23 of a shape. A holder female screw 26 is formed on the inner surface of the holder large-diameter portion 21 so as to be screwed into the boss male screw 16 formed on the outer surface of the body boss portion 11. The holder inner flange 27 for preventing the nut 92 from being detached is formed. Further, an outer surface notch (hereinafter referred to as “holder outer surface notch”) 24 and an outer surface groove (hereinafter referred to as “holder outer surface groove”) 25 for installing a handle 40 described later are formed on the outer surface of the holder middle diameter portion 22. ing.

(Holder outer surface notch and holder outer surface groove) The holder outer surface notch 24 is formed in parallel to the central axis 90z, and the holder outer surface groove 25 is continuous with the holder outer surface notch 24, and is annular in the circumferential direction of the outer surface of the holder medium diameter portion 22. Is formed. That is, the outer surface of the holder intermediate diameter portion 22 is cut out in a planar shape from the upper end of the holder intermediate diameter portion 22 to the holder step surface 21c, and a pair of holder outer surface cutout surfaces 24a parallel to each other are formed. . In addition, a holder outer surface groove 25 is formed at the position of the holder step surface 21c in continuation with the holder outer surface notch 24. And the space | interval of the holder outer surface notch surfaces 24a is slightly larger than the outer diameter (diameter) of the holder small diameter part 23. FIG. In addition, although the holder outer surface notches 24 are a pair facing each other, the present invention is not limited in quantity, but the holder outer surface notches 24 are arranged at symmetrical positions on the diagonal line of the central axis 90z, and the even number stabilizes the rotation. Therefore, it is preferable. Further, the holder outer surface cutout surface 24a is not limited to a flat cutout, and may be a concave surface having an arc shape or a rectangular shape, and may be with respect to the central axis 90z.

(Rotor cover) The rotor cover 30 includes a cover plate portion 32 that faces the body plate portion 12, a cover flange portion 33 that contacts the body flange portion 13, and a cover central hole portion 31 formed in the center of the cover plate portion 32. It is equipped with. Then, a part of the handle 40 (the handle inner cylinder lower portion 41) to be described later is inserted into the cover center hole portion 31, and a spacer 80 is disposed around the cover center hole portion 31 on the upper surface of the cover plate portion 32. .

(Handle) The handle 40 includes a cylindrical handle inner cylinder lower part 41, a handle inner cylinder upper part 46 connected to the upper part of the handle inner cylinder lower part 41, and a handle outer cylinder part 43 disposed outside the handle inner cylinder upper part 46. And a handle plate part 42 for connecting the handle inner cylinder upper part 46 and the handle outer cylinder part 43 to each other. At this time, the inner diameter of the handle inner cylinder lower portion 41 is larger than the inner diameter of the handle inner cylinder upper portion 46. The holder large-diameter portion 21 and the holder medium-diameter portion 22 of the nut holder 20 enter the inside of the handle inner cylinder lower portion 41, and the holder small-diameter portion 23 enters the inside of the handle inner cylinder upper portion 46. The outer surface of the handle inner cylinder lower portion 41 is substantially in contact with the inner edge of the cover center hole 31, and a snap ring 87 is installed in a handle outer surface groove 47 formed on the outer surface of the handle inner cylinder lower portion 41. Therefore, the rotor cover 30 cannot be detached from the handle 40, and the rotor cover 30 and the handle 40 are relatively rotatable around the central axis 90z. An annular handle lower surface groove 48 is formed on the lower surface of the handle plate portion 42, an O-ring 88 is disposed in the handle lower surface groove 48, and an annular handle inner surface groove 49 is formed on the inner surface of the handle inner cylinder upper portion 46. An O-ring 89 is formed in the handle inner surface groove 49.

(Inner Handle Claw) Further, an inner claw (hereinafter referred to as “handle inner claw”) 45 protruding toward the central axis 90z is formed on the inner surface of the handle inner cylinder lower portion 41. An end edge (hereinafter referred to as “inner claw tip edge”) 45a on the center axis 90z side of the handle inner claw 45 is a straight line, and the inner claw tip is within a predetermined range close to the inner claw tip edge 45a of the handle inner claw 45. An inner claw tip taper 45b that is inclined toward the lower surface as it approaches the edge 45a (thinner gradually decreases as it approaches the inner claw tip edge 45a) is formed (see FIG. 6). Therefore, the handle inner pawl 45 is easy to enter the holder outer surface groove 25, and a predetermined range is sized to enter the holder outer surface groove 25 (this will be described in detail later). Note that the interval between the inner claw tip edges 45a parallel to each other is smaller than the inner diameter (diameter) of the handle inner cylinder lower portion 41, and is slightly larger than the interval between the holder outer surface notch surfaces 24a.

(Handle Pin) A stopper (hereinafter referred to as “handle pin”) 44 that protrudes toward the handle inner claw 45 is provided on the handle inner cylinder upper portion 46. The handle pin 44 is located immediately above the handle inner claw 45 (the same phase in the circumferential direction) and does not protrude toward the central axis 90z at a position on the outer peripheral side of the inner claw tip edge 45a. The installation position of the handle pin in the vertical direction is not limited to the handle inner cylinder upper part 46, and may be installed on the handle inner claw 45 so as to protrude toward the handle inner cylinder upper part 46. You may install in the inner periphery of the inner cylinder lower part 41 so that it may protrude toward the central axis 90z. Further, the number, shape, or installation procedure of the handle pin 44 is not limited, and may be plural or rectangular protrusions, may be separately prepared and attached, or the lower part of the handle inner cylinder 41 may be formed integrally. Further, as will be described later, the handle pin 44 need not be installed.

(Modification) Although the nut holder 20 is installed in the rotor body 10 and the handle 40 is installed in the rotor cover 30 as described above, the present invention is not limited to this. That is, when the nut holder 20 is not installed in the rotor body 10, the outer surface corresponding to the holder outer surface notch 24 parallel to the central axis 90z and the circumferential holder outer surface are formed on the outer surface of the body boss portion 11 of the rotor body 10. An outer peripheral groove corresponding to the groove 25 is provided. When the handle 40 is not provided, an inner claw corresponding to the handle inner claw 45 is provided in the cover central hole 31 of the rotor cover 30 (or a cylindrical portion provided in the center of the rotor cover 30).

(Assembly Operation) FIGS. 4 and 5 are diagrams for explaining the assembly operation in the rotor according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view showing the start of the assembly operation, and FIG. It is sectional drawing which shows the time of completion | finish. In FIG. 4, first, the rotor body 10 is installed on the rotating shaft 91, that is, the nut holder 20 is installed on the rotor body 10 and the nut 92 is screwed onto the rotating shaft 91. The inner claw tip edge 45a faces the holder outer surface notch surface 24a in parallel, and the handle inner claw 45 does not interfere with the holder middle diameter portion 22 (at this time, the handle pin 44 does not interfere with the holder middle diameter portion 22). ), The holder large-diameter portion 21 and the holder medium-diameter portion 22 enter the inside of the handle inner cylinder lower portion 41 until the handle inner claw 45 substantially contacts the holder step surface 21c. Then, the O-ring 89 disposed in the handle inner surface groove 49 slides on the outer periphery of the holder small-diameter portion 23, and the O-ring 88 disposed in the handle lower surface groove 48 is disposed on the spacer 80 disposed on the upper surface of the cover plate portion 32. It abuts on the upper surface.

In FIG. 5, the handle 40 is pushed in slightly to elastically deform the rotor cover 30 and the O-ring 88 so that the handle inner claw 45 is substantially in contact with the holder step surface 21c in the vertical direction. 20 (same as the rotor body 10) and the handle 40 are relatively rotated. At this time, since the handle inner pawl 45 enters the holder outer surface groove 25, the handle 40 is restrained from moving in the vertical direction with respect to the nut holder 20 (same as the rotor body 10). Further, since the handle pin 44 comes into contact with the holder outer surface notch surface 24a and the relative rotation is stopped, it is well known that the handle inner claw 45 has entered the holder outer surface groove 25, and insufficient rotation or excessive rotation. Is prevented. The handle pin 44 may abut not the holder outer surface notch surface 24 a but the ridge line portion between the holder outer surface notch surface 24 a and the holder middle diameter portion 22.

(Effect) As described above, the handle inner claw 45 and the handle pin 44 are set in a phase that does not interfere with the holder middle diameter portion 22, and the holder middle diameter portion 22 enters the inside of the handle inner cylinder lower portion 41. By rotating the holder 20 (same as the rotor body 10) and the handle 40 relatively, the handle 40 (same as the rotor cover 30) is moved in the vertical direction with respect to the nut holder 20 (same as the rotor body 10). Can be impossible. At this time, the relative rotation is small (for example, about 50 °), and the operation is simple. Moreover, since it does not have a member corresponding to the piston as in the invention disclosed in Patent Document 1, it has a simple structure with a small number of parts. Furthermore, since the holder outer surface groove 25 is a simple groove formed in the entire circumferential direction and the holder outer surface notch surface 24a is a plane perpendicular to the central axis 90z, it is easy to process and the rotor 100 can be manufactured at low cost. it can. Further, since it is well known that the handle pin 44 abuts the holder outer surface notch surface 24a, the handle inner claw 45 has entered the holder outer surface groove 25, so that it is possible to perform suitable rotation. Rotation is prevented. The O ring 88 and the O ring 89 prevent the handle 40 and the rotor cover 30 from rattling. Moreover, when attaching the nut holder 20 to the rotor body 10, you may use the holder outer surface notch surface 24a as a site | part which tools hold.

(Modification) FIG. 6 is a perspective view illustrating a modification of the rotor according to the first embodiment of the present invention, with members separated. In FIG. 6, the handle pin 44 is removed, and a holder eye mark 72 is provided on the upper surface of the holder small diameter portion 23 of the nut holder 20, while a handle eye mark 74 is provided on the upper surface of the handle inner cylinder upper portion 46 of the handle 40. ing. At this time, the holder eye mark 72 and the handle eye mark 74 are separated from each other in the circumferential direction with the holder outer surface notch surface 24a of the holder outer surface notch 24 and the inner claw tip edge 45a of the handle inner claw 45 facing each other in parallel. On the other hand, with the handle inner pawl 45 entering the holder outer surface groove 25, the handle inner claws 45 are arranged close to each other in the circumferential direction and substantially aligned in the radial direction.

Accordingly, when the handle inner claw 45 enters the holder outer surface groove 25, the holder eye mark 72 and the handle eye mark 74 come close to each other. Can be stopped and insufficient rotation or excessive rotation can be prevented. The rotor 100 is provided with a handle inner claw 45 that protrudes from the inner surface of the handle 40 and a holder outer surface notch 24 and a holder outer surface groove 25 that are recessed in the outer surface of the nut holder 20. An inner surface notch and an inner surface groove that are recessed on the inner surface of the nut holder 20 and an outer claw that protrudes on the outer surface of the nut holder 20 are equivalent to the rotor 100.

[Embodiment 2] (Centrifuge) FIGS. 7 and 8 illustrate a centrifuge according to Embodiment 2 of the present invention. FIG. 7 is a perspective view showing the whole, and FIG. It is sectional drawing shown. In addition, the same name and the same code | symbol are attached | subjected to the same part as Embodiment 1, and description is abbreviate | omitted. 7 and 8, a centrifuge (same as a centrifuge) 200 is installed on a drive unit (same as an electric motor) 90 housed in a main body 210 and a rotating shaft 91 (same as an output shaft) of the drive unit 90. And a lid 220 that is rotatably installed on the main body 210, and an operation unit 230 for sending a signal to a control unit (not shown). As described above, the rotor 100 is simple in operation, has a simple structure with a small number of parts, and has the effect that it can be manufactured at low cost. Has an effect.

As described above, the rotor and the centrifuge according to the present invention are simple in operation, have a simple structure with a small number of parts, and can be manufactured at low cost. Therefore, various types of rotors and such rotors are equipped. It can be widely used as various rotating devices.

DESCRIPTION OF SYMBOLS 10 ... Rotor body, 11 ... Body boss | hub part, 12 ... Body plate part, 13 ... Body flange part, 14 ... Body recessed part, 15 ... Sample insertion hole, 16 ... Boss male screw, 20 ... Nut holder, 21 ... Holder large diameter part 21c ... Holder step surface, 22 ... Holder medium diameter portion, 23 ... Holder small diameter portion, 24 ... Holder outer surface notch, 24a ... Holder outer surface notch surface, 25 ... Holder outer surface groove, 26 ... Holder female screw, 27 ... Holder inner flange , 30 ... Rotor cover, 31 ... Cover center hole part, 32 ... Cover plate part, 33 ... Cover flange part, 40 ... Handle, 41 ... Lower part of handle inner cylinder, 42 ... Handle plate part, 43 ... Outer handle cylinder part, 44 ... handle pin, 45 ... handle inner claw, 45a ... inner claw tip edge, 45b ... inner claw tip taper, 46 ... handle inner cylinder upper part, 47 ... handle outer surface groove, 4 Handle lower groove, 49 inner handle groove, 72 holder eye mark, 74 handle eye mark, 80 spacer, 87 snap ring, 88 O ring, 89 O ring, 90 drive unit, 90z center Shaft, 91 ... Rotating shaft, 92 ... Nut, 100 ... Rotor (Embodiment 1), 200 ... Centrifuge (Embodiment 2), 210 ... Main body, 220 ... Lid, 230 ... Operation part

Claims (9)

A rotor body and a rotor cover that covers the rotor body, and has a body boss portion at a substantially central portion of the rotor body, formed on an outer surface of the body boss portion, and provided in an axial direction. And a circumferential outer surface groove continuous with the outer surface notch, the rotor cover is formed on the inner surface of the cover tube portion, the cover tube portion facing the body boss portion, and in the cover tube portion The inner boss projecting toward the outer notch, the body boss portion can enter the cover tube portion, and the body boss portion has entered the cover tube portion. When the body boss part and the cover tube part are relatively rotated in the circumferential direction, the inner claw enters the outer surface groove, and relative movement of the rotor body and the rotor cover in the axial direction is caused. Imprisonment Rotor characterized in that it is. A body eye mark and a cover, which are spaced apart from each other in a state where the inner claw faces the outer surface notch, and close to each other in a state where the inner claw enters the outer surface groove, on the end surface of the body boss portion and the end surface of the cover tube portion The rotor according to claim 1, wherein an eye mark is provided. The rotor according to claim 1, wherein a stopper that contacts the outer surface of the body boss portion when the inner claw enters the outer surface groove is provided on the inner surface of the cover cylinder portion. The rotor according to claim 1, wherein the outer surface grooves and the inner claws are plural. The rotor according to claim 1, wherein the outer surface groove is an annular shape formed over the entire outer surface of the body boss portion. The rotor according to claim 1, wherein a predetermined range near the center of the cover tube portion of the inner claw is inclined so as to become thinner as it approaches the center of the cover tube portion. The rotor body includes a cylindrical nut holder installed on an outer surface of the body boss portion, and the rotor cover is a cylindrical shape facing the nut holder instead of the cover tube portion facing the body boss portion. The outer surface notch and the outer groove are formed on the outer surface of the nut holder instead of the outer surface of the body boss portion, and the inner claw is replaced with the inner surface of the cover tube portion, The rotor according to any one of claims 1 to 6, wherein the rotor is formed on an inner surface of the handle. A drive unit having a rotation shaft; a rotor body installed on the rotation shaft; and a rotor cover covering the rotor body; a body boss portion at a substantially central portion of the rotor body; An outer surface notch that is formed on the outer surface of the portion and provided in the axial direction, and a circumferential outer surface groove that continues to the outer surface notch, and the rotor cover includes a cover tube portion that faces the body boss portion, And an inner claw formed on the inner surface of the cover tube portion and projecting into the cover tube portion, and the body boss portion enters the cover tube portion with the inner claw facing the outer surface notch. When the body boss portion and the cover tube portion rotate relative to each other in the circumferential direction in a state where the body boss portion has entered the cover tube portion, the inner claws enter the outer surface groove, Rotabode Centrifuges relative movement in the axial direction is characterized to be bound between the rotor cover and. The rotor body includes a cylindrical nut holder installed on an outer surface of the body boss portion, and the rotor cover is a cylindrical shape facing the nut holder instead of the cover tube portion facing the body boss portion. The outer surface notch and the outer groove are formed on the outer surface of the nut holder instead of the outer surface of the body boss portion, and the inner claw is replaced with the inner surface of the cover tube portion, The centrifuge according to claim 8, wherein the centrifuge is formed on an inner surface of the handle.

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