JP2001205136A - Rotor fitting device for centrifugal machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit and detach a rotor with one operation to and from a rotationally driven shaft member with a simple structure in a centrifugal machine. SOLUTION: Plural elastic locking pieces 12 formed dividedly by a slot 11b is provided at a cylindrical part 11 at the tip side of a rotationally driven shaft member 2 and also a catch 12a projecting in a diameter direction outside is formed near the tip of each elastic locking piece. A stepped part 13a for locking the catch is formed at a shaft hole 3a of the rotor 3 by a small diameter part. A push top 16 movable toward the axial direction is provided at the tip side of the shaft member, and an engage means for displacing the elastic locking pieces in the diameter direction inside is provided so that the locking of the catch is released by pushing the push top.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge used for a centrifuge, for example, and more particularly to a centrifuge rotor mounting device for removably mounting a rotor on a shaft member provided in a rotary drive device.

[0002]

2. Description of the Related Art A centrifuge of this type generally includes an electric motor, a shaft member provided on a rotating shaft of the motor, and a rotor detachably mounted on the shaft member. In a centrifugal separator, which is a typical device of a centrifuge, a sample holding unit for holding a container containing a sample is provided on a circumferential portion of the rotor, and the sample is held by driving the container in the sample holding unit. Separation of

[0003] In a centrifuge, it is necessary that rotors for various uses can be replaced and used. However, in a conventional centrifuge, when a rotor is fixed to a shaft member, most of the conventional centrifuges are disclosed in Japanese Utility Model Publication No. 57-8936 and Japanese Patent Publication No. 7-5017.
As shown in Japanese Patent No. 47, the rotor is fixed to the shaft member by screwing. Therefore, complicated work was required to replace the rotor.

[0004] In order to solve such a problem, Japanese Patent Laid-Open No. 9-239293 and Japanese Patent No. 29579 have been proposed.
As disclosed in Japanese Patent Publication No. 35-35, etc., there has been proposed a configuration in which a rotor can be detachably mounted on a shaft member with one touch.

[0005]

However, Japanese Patent Application Laid-Open No.
In the structure disclosed in JP-A-239293, since the rotor is fitted to the polygonal shaft member by fitting the shaft hole of the rotor, the rotor can be securely mounted on the shaft member with one touch. Sometimes it was not possible to confirm whether or not it was fixed. On the other hand, the structure disclosed in Japanese Patent No. 2957935 has a problem that the structure of the entire mechanism including the locking and unlocking means is complicated, and the number of parts is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a centrifuge rotor mounting apparatus that can easily attach and detach a rotor to and from a shaft member with a simple structure. .

[0007]

According to a first aspect of the present invention, there is provided a centrifuge rotor mounting apparatus according to the first aspect of the present invention, wherein a shaft hole of a rotor is fitted into a shaft member that is driven to rotate. A centrifuge rotor mounting device that is removably mounted, and has a plurality of elastic locking pieces provided by forming slits at predetermined circumferential intervals in a cylindrical portion on the distal end side. A shaft member provided with a locking claw for locking to a locking step formed by a small diameter portion provided in the shaft hole of the rotor near the tip of the elastic locking piece, and axially moving toward the tip of the shaft member. An operating member freely attached to the shaft member, a guide cylinder portion for fitting and holding a shaft hole of the rotor is formed on the shaft member, and a locking claw of the elastic locking piece is formed on a base end portion of the shaft member. A flange that sandwiches the rotor in the axial direction between the Between the elastic latching pieces, characterized in that a engagement means for displacing the latching claws radially inwardly by pressing the operation member.

According to a second aspect of the present invention, there is provided a rotor mounting device for a centrifuge according to the first aspect of the present invention, wherein the shaft is higher than a locking step in which the locking claw is locked in a shaft hole of the rotor. A tapered step for displacing the locking claw of the elastic locking piece inward in the radial direction is provided on the insertion end side of the member.

According to the present invention, the elastic locking piece can be elastically deformed radially inward to release the locked state of the locking claw only by pressing the operating member, so that the rotor can be released from the shaft member. Can be removed. In addition, the mounting of the rotor,
It can be performed accurately only by inserting the shaft member into the shaft hole of the rotor.

[0010]

1 to 4 show one embodiment of a centrifuge rotor mounting apparatus according to the present invention. In this embodiment, the centrifuge is a vertical centrifuge. The case will be described.

In these figures, reference numeral 1 denotes a rotary drive of a centrifuge, for example, a motor shaft of an electric motor (not shown), and 2 denotes a motor shaft 1 fitted at a distal end (upper end). A shaft member 3 having a fitting hole 2a on the lower end side is a rotor which is detachably mounted by fitting the shaft member 2 to the outside thereof.

The distal end 1a of the motor shaft 1 has a taper whose diameter decreases toward the distal end, and the inner peripheral surface of the fitting hole 2a of the shaft member 2 also increases in diameter toward the opening at the lower end. It is formed by a tapered hole. And this motor shaft 1
By fitting the shaft member 2 to each other and fitting the tapered surfaces to each other, these two shafts are fitted at a predetermined fitting position, and further integrally connected by a set screw 4.

The upper end portion of the shaft member 2 is formed as a concave portion 2b opening upward as shown in FIGS. 1 to 3, and the set screw 4 is formed from the bottom of the concave portion 2b to the fitting hole. A set screw 4 is screwed into 2a.

The lower end portion of the shaft member 2 is formed in a guide cylinder portion 10 substantially equal to the shaft hole 3a of the rotor 3, and a small diameter portion having a flange-like portion 11a near the upper end above it. The cylindrical portion 11 is formed by the concave portion 2b. And, in this small diameter cylindrical portion 11,
A plurality of slits 1 that are open at the top and that are long in the axial direction
1b are formed at equal intervals in the circumferential direction.

The small-diameter cylindrical portion 11 having the flange-like portion 11a and the slit 11b form a plurality of elastic locking pieces 12 which can be elastically deformed in the radial direction, for example, four pieces or more. A flange-shaped locking claw 12a is integrally formed near the upper end of each of the elastic locking pieces 12 so as to protrude outward. The locking claw 12a is provided in the shaft hole 3a of the rotor 3. The rotor 3 having the shaft member 3 fitted with the shaft hole 3a is prevented from coming off by engaging with the upper step 13a of the small-diameter annular protrusion 13.

The annular projection 13 is formed in a portion of the rotor 3 near the upper end of the shaft hole 3a.
Is formed by a hole 3b having a larger diameter than the shaft hole 3. The lower step 13b of the annular projection 13 is formed by a tapered surface. Therefore, the shaft member 2
When the rotor 3 is mounted on the lower surface, the locking claws 12a engage with the lower step 13b formed by the tapered surface, so that the elastic locking pieces 12 are elastically deformed radially inward. Is brought into sliding contact with the inner peripheral surface of the annular projection 13 so that the rotor 3 can be further pushed into the shaft member 2.

Each of the elastic locking pieces 12 is elastically returned radially outward by elasticity when the locking claw 12a passes through the annular projection 13, and the locking claw 12a is locked to the upper step 13a. The above-mentioned lower step 13b is not always necessary, and the shaft hole 3 is formed as a tapered hole having a smaller diameter as it goes upward in the axial direction.
a may be formed.

At least two circumferentially opposed elastic locking pieces 12 constituting the small-diameter cylindrical portion 11 have elongated holes 12c through which a locking pin 17 for assembling a push-top 16 to be described later penetrates. Are formed.
The elongated hole 12c is formed such that the longitudinal direction (axial direction) of the elastic locking piece 12 is long, and the push-top 16 to be pressed is movable in the vertical direction as described later.

The upper end portion of the shaft member 2 has inner and outer cylindrical portions 16a and 16b arranged so as to sandwich the upper end portion 12b of each elastic locking piece 12 between the inner peripheral side and the outer peripheral side. The push top 16 is assembled as a pressing operation member. This push top 16 includes FIGS.
The locking pin 17 is incorporated in the radial direction as shown in FIG.
Both ends of the locking pin 17 are provided through the elongated hole 12c.

The push top 16 is provided with
The state in which a biasing force is constantly applied upward by the compression coil spring 18 provided in the section b. Therefore, the push-top 16 is always located at the upper side as shown in FIGS. 1 to 3, and the locking pin 17 is located at the upper end side of the elongated hole 12c to prevent the push-up.

The lower end of the outer cylindrical portion 16b of the push top 16 is connected to the locking claw 12 of each of the elastic locking pieces 12.
a of the tapered portion 12d formed on the upper end side of FIG.
The lower end of the outer cylindrical portion 16b is connected to the tapered portion 12
It is formed in a tapered shape or an arc shape facing d.
In short, the tapered portion 12d and the outer cylindrical portion 16b
The engagement means comprising the lower end of the elastic member may be formed in such a shape that the elastic locking piece 12 can be elastically deformed radially inward by these engagements. Reference numeral 19 in the drawing is a set screw for fixing the locking pin 17.

Although the upper end 12b of each of the elastic locking pieces 12 is restricted from moving in the radial direction on the inner side surface of the outer cylindrical portion 16b of the push top 16, the inner and outer cylindrical portions are usually used. 16a and 16b are not touched. Also,
The outer diameter of the push top 16 is the shaft hole 3a of the rotor 3,
The inner diameter of each of the protrusion 3 b and the annular protrusion 13 is set smaller than the inner diameter of the rotor 3, so as not to interfere with the rotor 3.

Also, the locking claw 12a of the elastic locking piece 12
As described above, the outer peripheral edges of the shaft holes 3a,
3 b, and is set so as to project slightly radially outward from the inner surface of the annular projection 13.

A flange 15 is integrally formed at a lower portion of the shaft member 2, and a rotor 3
A drive pin 15a for transmitting rotation to the motor is protruded.
On the other hand, drive pin holes 15b are provided on the lower surface of the rotor 3, and these are engaged with each other. In such an engaged state, torque is transmitted by rotating the shaft member 2 by the motor shaft 1, and the rotor 3 is driven to rotate. Here, the drive pin 15a is arranged so as to face the drive pin hole 15b on the lower surface of the rotor 3, the opening edge of the hole is chamfered, and is introduced into the pin hole 15b in cooperation with the inclination of the center of the pin 15a. It is formed so that it can be easily performed.

In the above structure, the shaft member 2 has the rotor 3
Is mounted from above, the portion of the shaft hole 3a of the rotor 3 is
The guide cylinder 10 can be lowered in a sliding state without touching the second locking claw 12a. At this time, when the rotor 3 is further pushed down in a state where the lower step 13b of the annular projection 13 is engaged with the upper tapered portion 12d of the locking claw 12a, the elastic locking piece 12 is elastically deformed radially inward. The locking claw 12a can pass through the portion of the annular projection 13.

When the locking claw 12a passes through the annular protrusion 13, each of the elastic locking pieces 12 expands radially outward by a spring force, and each of the locking pieces 12a is
And the rotor 3 is engaged with the flange 15
And the locking claw 12a are sandwiched in the axial direction. Thereby, the rotor 3 is assembled and fixed to the shaft member 2.

Also, as described above, the rotor 3 is attached to the shaft member 2.
When the rotation of the centrifuge in the state of mounting is increased, the locking claw 12a is bent radially outward due to centrifugal force. As a result, the locking claw 12a moves outward in a substantially arc-shaped trajectory centered on the root portion thereof, so that the rotor 3 is moved downward (the surface of the flange 15 of the shaft member 2). Acts to push even harder.

Here, when the rotor 3 is mounted on the shaft member 2 described above, the locking claw 12a of the elastic locking piece 12 rides on the lower step 13b of the annular projection 13 and engages with the upper step 13a. The click feeling generated at the time of stopping makes it possible to inform the worker whether or not the rotor 3 is correctly mounted. When the rotor 3 is mounted on the shaft member 2, when the rotor 3 is mounted, the push-top 16
Can also be notified by protruding the upper end portion. That is, the push top 16 is connected to the rotor 3
The locking claw 12a is locked to the upper end side step portion 13a of the
The rotor 3 projects upward from the upper end surface.

On the other hand, when removing the rotor 3, when the rotor 3 is pulled out while pushing down the push top 16, the lower end of the outer cylindrical portion 16b of the push top 16 pushes the upper tapered portion 12d of the locking claw 12a. Of the elastic locking pieces 12 are radially inwardly deformed so that the locking by the locking claws 12a is released by the cam action. Since the outer edge of each locking claw 12a is smaller than the inner diameter of the annular projection 13 of the rotor 3, the rotor 3 can be removed.

When only the shaft member 2 is rotated at a high speed without mounting the rotor 3, a large centrifugal force is generated, and the locking claw 12a tends to deform radially outward.
Since it is regulated by the outer cylindrical portion 16b of the push top 16, large deformation such as plastic deformation does not occur.

The present invention is not limited to the structure described in the above embodiment, and it goes without saying that the shape and structure of each part can be appropriately modified and changed. For example, appropriate modifications can be considered for the shapes of the motor shaft 1, the shaft member 2, and the rotor 3. The shaft member 2 and the push top 16 may be formed of a material having a spring property such as SUS630, for example, but are not limited thereto, and may be formed of an appropriate material such as a synthetic resin material.

The rotary drive for rotating the shaft member 2 is of course not limited to an electric motor.
Further, the present invention is not limited to a centrifuge, and any centrifuge having a structure similar to this can be freely applied.

[0033]

As described above, according to the centrifuge rotor mounting apparatus according to the present invention, when the rotor is mounted on the shaft member, the one-touch operation of adjusting the shaft hole of the rotor to the shaft member and simply pushing down. It is possible to perform accurate fixation only by using the above. Further, according to the present invention, by pressing the operating member provided on the upper end side of the shaft member, the elastic locking piece can be elastically deformed to release the locked state of the locking claw. It can be easily pulled out from the shaft member and removed.

[Brief description of the drawings]

FIG. 1 is a view illustrating one embodiment of a rotor mounting device for a centrifuge according to the present invention and illustrating a state where a shaft member of a centrifuge and a rotor are combined.

FIG. 2 is an enlarged view showing a rotor mounting device at the time of mounting the rotor, which is a main part in the rotor mounting device of the centrifuge in FIG.

FIG. 3 is an enlarged view showing a shaft member in the rotor mounting device of FIG. 2;

4 is a view showing only a shaft hole portion of a rotor detachably mounted on the shaft member of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor shaft, 2 ... Shaft member, 2a ... Fitting hole, 2b ... Concave part, 3 ... Rotor, 3a ... Shaft hole, 3b ... Hole part, 4 ... Set screw, 10 ... Guide cylinder part, 11 ... Small diameter cylinder , 11a ... flange-shaped part, 11b ... slot, 12 ... elastic locking piece,
12a: locking claw, 12b: upper end, 12c: elongated hole, 12
d: tapered portion, 13: annular protrusion, 13a: upper step portion, 1
3b: Lower step, 15: Flange, 15a: Drive pin, 15b: Drive pin hole, 16: Push top (operating member), 16a, 16b: Inner, outer cylindrical part, 17
... locking pin, 18 ... compression coil spring, 19 ... set screw.

Claims (2)

[Claims] 1. A centrifuge rotor mounting device which is removably mounted by fitting a shaft hole of a rotor to a shaft member which is driven to rotate, wherein a predetermined interval in a circumferential direction is provided in a cylindrical portion on a distal end side. A plurality of elastic locking pieces provided by forming a slit, and a stepped portion formed by a small diameter portion provided in the shaft hole of the rotor near the tip of the elastic locking pieces. A guide member provided with a shaft member provided with a locking claw to be stopped, and an operating member movably mounted in the axial direction on a distal end side of the shaft member, wherein the shaft member is fitted and held in a shaft hole of the rotor. A flange that sandwiches the rotor in the axial direction between the elastic locking piece and the locking claw at the base end of the shaft member, between the operating member and the elastic locking piece. By pressing the operation member, the locking claw is moved in the radial direction. The rotor mounting apparatus centrifuge, characterized in that a engagement means for displacing the. 2. The centrifugal rotor mounting device according to claim 1, wherein the locking claw is locked in the shaft hole of the rotor at a position closer to the insertion end of the shaft member than a locking step. A rotor mounting device for a centrifuge, wherein a tapered step portion for displacing a locking claw of the elastic locking piece inward in a radial direction is provided.