JP6148484B2 - Swing rotor and centrifuge for centrifuge - Google Patents

Description

  The present invention relates to a centrifuge for separating a liquid sample such as blood using centrifugal force and a swing rotor for a centrifuge, and more particularly, a swing rotor for a centrifuge that prevents a bucket from falling off a rotor yoke and falling. The present invention relates to a centrifuge.

  2. Description of the Related Art Conventionally, a centrifuge swing rotor is constituted by a rotor yoke and a bucket, and the bucket is held on the rotor yoke by locking a pin of the bucket in a yoke groove provided in the rotor yoke (see, for example, Patent Document 1). ).

  For example, as shown in FIGS. 11 to 13, the yoke groove 2 having a U-shaped cross section provided at the tip of the arm portion 1 a of the rotor yoke 1 has an opening above the yoke groove 2. The rotor yoke 1 is tilted by an angle α toward the rotation center axis 3 a of the rotation center hole 3 of the rotor yoke 1.

  As shown in FIG. 14, the bucket 5 attached to the rotor yoke 1 is constituted by a pipe hanger 5a made of a cast (lost wax) product and a pipe 5b made of aluminum. Pins are provided at both ends of the pipe hanger 5a. 5c is provided. When the pin 5c of the bucket 5 is locked in the yoke groove 2 of the rotor yoke 1, the bucket 5 is held by the rotor yoke 1 as shown in FIG.

  The swing rotor 10 is attached to a centrifuge (not shown). As shown in FIGS. 16 and 17, when the swing rotor 10 is rotated by the centrifuge, the tube 5b is swung up about 90 degrees by the centrifugal force with the pin 5c of the bucket 5 as the center of rotation while being integrated with the tube hook 5a. When the swing rotor 10 has finished rotating, the tube 5b returns to the vertical state due to its own weight.

  When the operation of the centrifuge is completed, the user stands in front of the centrifuge and performs the extraction work of the tube 11 inserted into the tube 5b of the bucket 5 as shown in FIG. At this time, the user needs to pull the tube 11 upward, and then the pulled tube 11 is drawn to the user's hand or placed in a rack around the centrifuge.

  That is, the tube extraction operation is performed by moving the tube 11 upward and moving the tube 11 in the horizontal direction. When the user quickly performs the tube extraction operation, the upward movement and the horizontal movement are performed almost simultaneously, and the tube 11 is pulled out obliquely upward in the direction of arrow A in the figure.

  When the tube 11 is pulled out in this way, the pin 5c of the bucket 5 may come off from the yoke groove 2 of the rotor yoke 1, and two cases of phenomenon 1 and phenomenon 2 can be considered as such a case.

  Phenomenon 1 is when the tube 11 is pulled out obliquely upward in the direction of arrow A in FIG. In this case, as shown in FIG. 19, since the user holds the upper end 11a of the tube 11 by hand, the tube 11 comes into contact with the point B1 which is the upper end edge of the tube 5b of the bucket 5, and a frictional force is generated. Then, an attempt is made to turn in the clockwise direction in FIG. When the tube 11 tries to turn in the clockwise direction in FIG. 18 indicated by the arrow C, a frictional force is generated at the point B2 at the end where the tube 5b and the tube 11 are in contact, and the tube 5b is also shown in FIG. Turn clockwise.

  At this time, since the tube 5b is inserted into the hole of the tube hook 5a, as shown in FIG. 19, the entire bucket 5 is lifted upward with the other end of the pin 5c as a fulcrum at one end of the pin 5c. As the other end side of the pin 5c is lifted upward, the bucket 5 as a whole is inclined obliquely upward in the direction of arrow A, and the frictional force due to the contact between the tube 11 and the tube 5b is reduced. In the figure, it is extracted obliquely upward in the direction of arrow A.

  In a state where the other end side of the pin 5c of the bucket 5 is lifted upward, the bucket 5 is very unstable because only the tip on one end side of the pin 5c locked to the yoke groove 2 is in contact with the rotor yoke 1. is there. That is, the other end side of the pin 5c of the bucket 5 pivots in the horizontal direction with the one end side of the pin 5c contacting the rotor yoke 1 as a fulcrum by a slight movement of the tube 11 until the user pulls out the tube 11 from the tube 5b. Resulting in.

  As a result, as shown in FIG. 20, after the tube 11 is pulled out from the tube 5b of the bucket 5, the other end side of the pin 5c that has been lifted does not fall into the yoke groove 2, but is removed from the yoke groove 2. As a result, the bucket 5 falls from the rotor yoke 1.

  FIG. 21 shows phenomenon 1 at this time. A solid line arrow U is a direction in which the other end side of the pin 5c of the bucket 5 tends to float up from the yoke groove 2 in the case of phenomenon 1, and if the other end side of the pin 5c tries to move in the arrow U direction, Moves obliquely upward along the inclined surface H, and therefore moves toward the opening of the yoke groove 2 of the rotor yoke 1. Thereafter, due to a slight movement of the tube 11 by the user's hand, the other end side of the pin 5c moves in the direction of the broken arrow and comes out of the yoke groove 2.

  Or, as shown in FIG. 22, the other end side of the pin 5 c removed from the yoke groove 2 may be caught by a portion other than the yoke groove 2, and the bucket 5 may not fall from the rotor yoke 1. Such a situation occurs when the portion other than the pin 5 c of the bucket 5 contacts the rotor yoke 1 due to the pin 5 c coming off the yoke groove 2. If the user does not notice that the pin 5c of the bucket 5 is not locked to the yoke groove 2 of the rotor yoke 1 and starts the next centrifugal operation, the bucket 5 is detached from the rotor yoke 1 during rotation. An accident occurs.

  As shown in FIG. 23, the phenomenon 2 is a case where the extraction direction of the tube 11 differs from the case of the phenomenon 1 by about 90 degrees, and the tube 11 is pulled out obliquely upward in the direction of arrow P in the drawing. In this case, the opening direction of the yoke groove 2 of the rotor yoke 1 is inclined toward the direction of the rotation center axis 3 a of the swing rotor 10. This is because when the swing rotor 10 rotates, the pin 5c of the bucket 5 always stays at the position where the radius of rotation of the yoke groove 2 is the largest due to the centrifugal force.

  The user holds the upper end portion 11 a of the tube 11 by hand and performs an operation for extracting the tube 11 from the bucket 5. Normally, when the tube 11 is about to be extracted in the direction of arrow P, the tube 11 contacts the inner surface of the tube 5b of the bucket 5 and turns in the direction of arrow Q with the upper end 11a as the center of rotation. At this time, since the tube 11 is inserted into the tube 5b of the bucket 5, as shown in FIG. 24, the bucket 5 rotates about the pin 5c as a rotation axis. When the tube 11 and the bucket 5 are swung in the arrow Q direction and the entire bucket 5 is tilted in the arrow P direction, the tube insertion hole of the tube 5b of the bucket 5 is directed in the arrow P direction, and the tube 11 is extracted.

  However, the operation is different when the user grips the upper end portion 11a of the tube 11 and the above-described tube extraction operation is performed while the vertical state of the tube 11 is maintained. In this case, when the tube 11 is about to be pulled out in the direction of arrow P, the tube 11 comes into contact with the bucket inner surface, but since the user strongly holds the upper end portion 11a of the tube 11, the tube 11 has an upper end portion. It does not turn in the direction of arrow Q with 11a as the center of rotation.

  Since the tube 11 is inserted into the pipe 5b of the bucket 5, the bucket 5 also moves in the direction of the rotation center axis 3a together with the tube 11 without turning in the arrow Q direction. At this time, as shown in FIG. 25, the pin 5c of the bucket 5 moves in the direction of the rotation center axis 3a along the inclined surface G, and the pin 5c of the bucket 5 comes off from the yoke groove 2 of the rotor yoke 1, and the bucket 5 Falls from the rotor yoke 1.

  Phenomenon 2 at this time is shown in FIG. The solid line arrow J is the direction of the pin 5c that the pin 5c of the bucket 5 tries to move to the rotation center axis 3a in the case of phenomenon 2, and if the pin 5c tries to move in the direction of the arrow J, it is actually inclined. Since it moves obliquely upward as indicated by the dashed arrow along the surface G, it moves to the opening of the yoke groove 2 of the rotor yoke 1, and the pin 5 c gets over the inclined surface G and comes off the yoke groove 2.

  Alternatively, as shown in FIG. 27, only one end side of the pin 5 c of the bucket 5 is not detached from the yoke groove 2, and the other end side of the pin 5 c is detached from the yoke groove 2, and is caught by a portion other than the yoke groove 2. May not fall from the rotor yoke 1. Such a situation occurs when the portion other than the pin 5 c of the bucket 5 contacts the rotor yoke 1 due to the pin 5 c coming off the yoke groove 2. If the user does not notice that the pin 5c of the bucket 5 is not locked to the yoke groove 2 of the rotor yoke 1 and starts the next centrifugal operation, the bucket 5 is detached from the rotor yoke 1 during rotation. An accident occurs.

Japanese Utility Model Publication No. 63-43657

  Thus, in the conventional swing rotor 10, when the tube extraction operation is performed in the direction of arrow A in the state shown in FIGS. 18 and 19, or in the state shown in FIG. When the tube extraction operation is performed while being held, there is a problem that the pin 5c of the bucket 5 is detached from the yoke groove 2, leading to an accident.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a swing rotor for a centrifuge and a centrifuge that can prevent the bucket from dropping.

In order to achieve this object, the invention according to claim 1 includes a plurality of housings housed in a rotating body chamber provided inside a housing and detachably and rotatably locked to a bucket holding portion of a rotor yoke. In a centrifuge swing rotor attached to a drive shaft of a drive motor with a bucket, a yoke groove is formed in the bucket holding portion to engage a pin of the bucket, and the yoke groove is in a centrifugal operation state. An arcuate storage surface on which the pin is held, an upper stopper having a top wall formed as a horizontal surface to restrict the upward movement of the pin, and a space between the storage surface and the horizontal surface. An inclined surface to be connected and an inner wall are formed as an arc-shaped contact surface to restrict the movement of the pin in the horizontal direction, and the upper end portion is separated from the rotation center axis of the swing rotor. A side stopper formed as an inclined portion inclined by a predetermined angle with respect to the rotation center axis in a gradually decreasing direction, and a tip portion of the upper stopper has the inclination of the side stopper in the vertical direction. It should be provided at a position that overlaps the part .

The invention according to claim 2 is a housing, a rotating body chamber provided in the housing, and housed in the rotating body chamber, and is detachably and rotatably locked to a bucket holding portion of the rotor yoke. that a plurality of swing rotor mounted on the drive shaft of the drive motor bucket in a state having a yoke groove pin is locked in the bucket to the bucket holding portion is formed, the yoke groove, centrifugal An arcuate storage surface on which the pin is held in an operating state, an upper stopper having an upper wall formed as a horizontal surface to restrict the upward movement of the pin, and the storage surface and the horizontal surface The inner wall is formed as an arcuate contact surface to regulate the horizontal movement of the pin and the inclined surface connecting the pins, and the upper end portion gradually increases as it moves away from the rotation center axis of the swing rotor. And a side stopper formed as an inclined portion inclined by a predetermined angle with respect to the rotation center axis in the direction of the upper end, and the tip portion of the upper stopper has the inclined portion of the side stopper in the vertical direction. It should be provided in a position that overlaps .

  According to the present invention, an upper stopper that restricts the upward movement of the pin and a side stopper that restricts the horizontal movement of the pin are provided in the yoke groove formed in the bucket holding portion of the swing rotor. As a result, when the tube inserted into the tube of the bucket is pulled out, the bucket pin is restricted from moving upward and horizontally inside the yoke groove together with the tube. It is possible to prevent the bucket from dropping when the tube is pulled out without coming off.

It is sectional drawing which shows the structure of the centrifuge in embodiment of this invention . It is a perspective view which shows the structure of the rotor yoke in embodiment of this invention . It is a top view which shows the structure of the rotor yoke in embodiment of this invention . It is sectional drawing which shows the structure of the X1-X1 cross section of FIG. It is an enlarged view with which it uses for description of the structure of the yoke groove | channel in embodiment of this invention , and the upward motion (1) of the pin latched by the said yoke groove | channel. It is an enlarged view with which it uses for description of the upward motion (2) of the pin latched by the yoke groove | channel in embodiment of this invention . It is an enlarged view with which it uses for description of the motion to the horizontal direction of the pin latched by the yoke groove | channel in embodiment of this invention . It is an enlarged view which shows the structure of the yoke groove | channel in the 1st reference example . It is an enlarged view which shows the structure of the yoke groove | channel in the 2nd reference example . It is a perspective view which shows the structure of the bucket in other embodiment. It is a perspective view which shows the structure of the rotor yoke of the conventional swing rotor. It is a top view which shows the structure of the rotor yoke of the conventional swing rotor. It is sectional drawing which shows the structure of the X2-X2 cross section of FIG. It is a perspective view which shows the structure of a bucket. It is a perspective view which shows the swing rotor with which the bucket was mounted | worn with the conventional rotor yoke. It is a top view which shows the structure of the swing rotor by which the bucket was mounted | worn with the conventional rotor yoke. It is a front view which shows the structure of the swing rotor by which the bucket was mounted | worn with the conventional rotor yoke. It is a basic diagram which shows the state by which the tube was inserted in the pipe | tube of the bucket of the conventional rotor yoke. It is a basic diagram which shows the state which the bucket inclined when the tube was extracted from the pipe | tube of the bucket of the conventional rotor yoke. FIG. 13 is a schematic diagram illustrating pin movement in the configuration of the Y1-Y1 cross section of FIG. 12. It is a basic diagram which shows the motion of the pin accommodated in the yoke groove | channel of the conventional rotor yoke. FIG. 13 is a schematic diagram illustrating a state where a pin is caught in the configuration of the Y1-Y1 cross section of FIG. 12. It is a basic diagram which shows the state by which the tube was inserted in the pipe | tube in the structure of the X3-X3 cross section of FIG. It is a basic diagram which shows the state in which the pipe | tube in which the tube was inserted in the structure of the X3-X3 cross section of FIG. It is a basic diagram which shows the motion of the pin of a bucket in the structure of the X2-X2 cross section of FIG. It is a basic diagram which shows the motion corresponding to the phenomenon 2 of the pin of a bucket in the conventional yoke groove | channel. It is an approximate line figure showing the state where the pin of the bucket was caught in the composition of the X2-X2 section of Drawing 12.

  Embodiments of the present invention will be described below.

(1) Embodiment of the present invention <Overall configuration of centrifuge>
As shown in FIG. 1, the centrifuge 100 has a box-shaped casing 101, and a chamber lid 103 is provided in an upper opening of the casing 101. A hinge 102 is provided at one end of the upper opening of the housing 101, and a door lock unit 106 is provided at the other end of the upper opening of the housing 101, and opens and closes to the housing 101 via the hinge 102 and the door locking unit 106. A chamber lid 103 is freely attached.

  A drive motor 104 is provided inside the housing 101. The drive motor 104 is attached to the bottom of the housing 101 via vibration isolation means 105 disposed around the drive motor 104, and the drive shaft 104a of the drive motor 104 rotates the swing rotor 120 as a centrifuge swing rotor. It is fixed to the center hole.

  The entire swing rotor 120 is housed in a rotating body chamber 107 a formed by the chamber 107. A chamber edge is attached to the upper edge of the chamber 107 as an opening edge of the housing 101 and serves as a sealing material for sealing the rotating body chamber 107a when the chamber lid 103 is closed with respect to the housing 101. Rubber 108 is attached to the upper edge. Between the lower end portion of the chamber 107 and the drive motor 104, a motor cover rubber 109 is attached as a sealing material for sealing the rotating body chamber 107a of the chamber 107.

  An operation panel 110 and an operation knob 111 are provided on the front surface of the housing 101 so that the user can set the rotation speed, operation time, and the like of the drive motor 104. A control unit 112 including a CPU (Central Processing Unit) and the like electrically connected to the operation panel 110 and the operation knob 111 is provided.

<Configuration of rotor yoke>
As shown in FIGS. 2 to 4, in which parts corresponding to those in FIGS. 11 to 13 are given the same reference numerals, the rotor yoke 130 of the swing rotor 120 is divided into two forks at the tips of the arm portions 1 a provided at intervals of 90 degrees. Each of the bucket holding portions 131 is formed.

The bucket holding portion 131 holds the pin 5c of the bucket 5 in a locked state, and has a yoke groove 132 formed in a shape peculiar to the embodiment of the present invention , and the yoke groove 132 is the rotor yoke 130. The rotation center hole 3 is directed in the direction of the rotation center axis 3a.

  As shown in FIG. 5, the bucket holding portion 131 of the rotor yoke 130 has a pocket-like shape that can accommodate the pin 5 c of the bucket 5 that is accommodated from the opening 138 that is oriented in the direction of the rotation center axis 3 a of the rotation center hole 3. A yoke groove 132 is formed.

  The bucket holding portion 131 includes an arcuate storage surface 137 that holds the pin 5c of the bucket 5 when the bucket 5 is mounted or in a centrifugal operation state, and the pin 5c in the yoke groove 132. The upper stopper 133 whose upper wall is formed as a horizontal plane 133a to restrict the movement in the middle and upper direction is connected between the storage surface 137 and the horizontal plane 133a of the upper stopper 133, and the pin 5c is moved upward in the figure. An inclined surface 136 that is inclined so as to be easily in contact with the pin 5c, an inner wall is formed as an arc-shaped contact surface 134a to restrict movement of the pin 5c in the horizontal direction, and an upper end portion is the swing rotor 120. And a side stopper 134 formed as an inclined portion 134b inclined by an angle β with respect to the rotation center axis 3a. That is, in the bucket holding portion 131, the yoke groove 132 is configured by the storage surface 137, the upper stopper 133, the inclined surface 136, and the side surface stopper 134.

  The inclined surface 136 of the yoke groove 132 is in contact with the inclined surface 136 when the bucket pin 5c moves upward from the storage surface 137 toward the upper stopper 133 as indicated by the solid arrow Z1. The pin 5c slightly protrudes so as to be moved toward the upper stopper 133 along the line.

<Pin movement during tube extraction>
The movement of the pin 5c when the tube 11 is extracted from the tube 5b of the bucket 5 attached to the rotor yoke 130 of the swing rotor 120 configured as described above will be described in correspondence with the phenomenon 1 and the phenomenon 2 described above.

<Pin movement during tube extraction operation corresponding to phenomenon 1>
When the tube 11 is pulled out from the tube 5b of the bucket 5 locked in the yoke groove 132 formed in the bucket holding portion 131 of the rotor yoke 130, as described in the phenomenon 1 (FIG. 19), the pin 5c of the bucket 5 When a force that lifts upward (in the direction of arrow Z1 shown by a solid line in FIG. 5) is applied to the other end of the pin 5, the pin 5c of the bucket 5 moves upward (in the direction of the arrow shown by a broken line in the figure) along the inclined surface 136 The upper stopper 133 abuts against the horizontal surface 133a, and the pin 5c is restricted by the upper stopper 133 so that it does not move.

  In this state, since the tube 11 is pulled out with a force larger than the frictional force caused by the contact between the tube 11 and the tube 5b of the bucket 5, other than the pin 5c of the bucket 5 that has been lifted after the tube 11 is pulled out of the tube 5b. The end side drops downward at that position, and when falling, the pin 5c comes into contact with the contact surface 134a of the side stopper 134 and rebounds, and the pin 5c returns to the original storage surface 137.

  As a result, in the rotor yoke 130, the pin 5 c of the bucket 5 does not come off from the yoke groove 132 of the bucket holding portion 131, so that the bucket 5 falls from the rotor yoke 130, or the bucket 5 is not the yoke groove 132 of the rotor yoke 130. It is possible to prevent an accident in which the bucket 5 is scattered by being caught in a part and being centrifugally operated without the user noticing that fact.

  Further, as shown in FIG. 6, in the rotor yoke 130, the inclined portion 134 b provided at the upper end portion of the side stopper 134 is inclined by the angle β with respect to the rotation center axis 3 a of the rotation center hole 3. A force that lifts upward (in the direction of the arrow Z1 shown by the solid line in FIG. 5) acts on the other end of the pin 5c, and even when the pin 5c slightly moves in the direction of the rotation center axis 3a, the tube 11 After being pulled out from the tube 5b, the other end portion of the pin 5c of the bucket 5 that has floated falls down to the lower inclined portion 134b and slides down into the yoke groove 132 along the inclined portion 134b, thereby returning to the original storage surface 137. Return to.

  That is, the inclined portion 134b of the side stopper 134 also functions as a guide for returning the pin 5c of the bucket 5 to the storage surface 137, so that the pin 5c of the bucket 5 can be reliably guided back to the original storage surface 137. .

<Pin movement during tube removal operation corresponding to phenomenon 2>
As shown in FIG. 25 and FIG. 26, the user strongly grips the upper end portion 11a of the tube 11, and the direction of the arrow P as shown in FIG. When the tube extraction operation is performed, the tube 11 comes into contact with the inner surface of the tube 5b of the bucket 5, but since the user strongly holds the upper end portion 11a of the tube 11, the tube 11 has the upper end portion 11a. Phenomenon 2 occurs in which the pin 5c of the bucket 5 moves together with the tube 11 toward the rotation center axis 3a without turning in the arrow Q direction with the rotation center as the rotation center, and without turning the bucket 5 in the arrow Q direction.

  However, as shown in FIG. 7, the yoke groove 132 formed in the bucket holding portion 131 of the rotor yoke 130 is provided with a side stopper 134, so that the pin 5c of the bucket 5 is indicated by a broken line arrow. Even if the pin 5c moves toward the rotation center shaft 3a, the movement of the pin 5c toward the rotation center shaft 3a is restricted by contacting the contact surface 134a of the side stopper 134. Will not come off. That is, since the abutting surface 134a of the side stopper 134 is formed in an arc shape, all of the force that moves the pin 5c toward the rotation center shaft 3a is received by the abutting surface 134a, and the pin 5c of the bucket 5 is received by the side stopper. You cannot get over 134.

  Therefore, in the rotor yoke 130, even when the tube 11 is pulled out as shown in the phenomenon 2, the pin 5c of the bucket 5 is not easily detached from the yoke groove 132, so that the bucket 5 falls from the rotor yoke 130. Further, it is possible to prevent an accident in which the bucket 5 is caught by a portion other than the yoke groove 132 of the rotor yoke 130 and the user performs a centrifugal operation without noticing that, and the bucket 5 is scattered.

Here, the technique used as a reference of this invention is demonstrated.
(2) First Reference Example <Configuration of Rotor Yoke>
Centrifuge in the first reference example, since in the embodiment of the present invention is the same as the centrifuge 100 (FIG. 1), here omitted for convenience the description, swing rotor in the embodiment of the present invention Instead of the 120 rotor yoke 130, as shown in FIG. 8 in which the same reference numerals are given to the corresponding parts to FIG. 5, only the bucket holding portion 151 of the rotor yoke in the first reference example different from the embodiment of the present invention is shown. explain.

The bucket holding portion 151 holds the pin 5c of the bucket 5 in a locked state, and has a yoke groove 152 formed in a shape unique to the first reference example, and the opening of the yoke groove 152 is a rotor yoke. The rotation center hole 3 is directed in the direction of the rotation center axis 3a.

  The bucket holding portion 151 is formed with a vertically-long pocket-shaped yoke groove 152 that can receive the pin 5c of the bucket 5 that is received from the opening of the rotation center hole 3 directed toward the rotation center axis 3a.

  The bucket holding portion 151 includes an arcuate storage surface 137 that holds the pin 5c of the bucket 5 when the bucket 5 is mounted or in a centrifugal operation state, and the pin 5c in the yoke groove 152. In order to restrict the movement in the middle-up direction, the upper wall is formed between the upper stopper 153 formed as an arc-shaped contact surface 153a similar to the pin 5c, and the contact surface 153a of the storage surface 137 and the upper stopper 153. When the knot pin 5c moves in the upward direction in the figure, the inclined surface 136 is inclined so as to easily come into contact with the pin 5c, and the inner wall is formed as a vertical surface 154a in order to restrict the horizontal movement of the pin 5c. In addition, a side stopper 154 having an upper end formed as a horizontal plane 154b is provided. That is, in the bucket holding portion 151, the yoke groove 152 is configured by the storage surface 137, the upper stopper 153, the inclined surface 136, and the side surface stopper 154.

  The upper stopper 153 is formed with an R-shaped chamfer 153b on the opening side of the tip connected to the arc-shaped contact surface 153a, and the side stopper 154 is formed at a corner where the vertical surface 154a and the horizontal surface 154b are connected. An R-shaped chamfer 154c is formed. Accordingly, when the user tries to remove the bucket 5 and the pin 5 c of the bucket 5 is finally extracted from the yoke groove 152, the bucket 5 is easily extracted from the opening between the upper stopper 153 and the side stopper 154.

<Pin movement during tube extraction operation corresponding to phenomenon 1>
Thus, in the bucket holding portion 151, as shown in the phenomenon 1, when the tube 11 stored in the tube 5b of the bucket 5 is extracted from the tube 5b, the force that floats upward at the other end of the pin 5c of the bucket 5 In this case, the pin 5c of the bucket 5 is moved upward along the inclined surface 136 and comes into contact with the arc-shaped contact surface 153a of the upper stopper 153, but the contact surface 153a is formed in an arc shape. Therefore (FIG. 8), the movement toward the rotation center shaft 3a is restricted, and the pin 5c is not detached from the yoke groove 132.

  That is, since the contact surface 153a of the upper stopper 153 is formed in an arc shape, the movement of the pin 5c toward the rotation center shaft 3a is also restricted, and the pin 5c is prevented from being easily detached from the yoke groove 152. Is done.

<Pin movement during tube removal operation corresponding to phenomenon 2>
As shown in FIG. 8, the yoke groove 152 formed in the bucket holding portion 151 is provided with a side stopper 154 so that the pin 5c of the bucket 5 can move toward the rotation center shaft 3a. Since the pin 5c comes into contact with the vertically long vertical surface 154a of the side stopper 154, the movement toward the rotation center shaft 3a is restricted, so that the pin 5c is not detached from the yoke groove 152. That is, since the vertical surface 154a of the side stopper 154 is formed in a vertically long shape, the force that moves the pin 5c toward the rotation center axis 3a is all received by the vertical surface 154a, and the pin 5c of the bucket 5 gets over the side stopper 154. It is not possible.

  In this case, when the user finally tries to remove the pin 5c of the bucket 5 from the yoke groove 152, the chamfers 153b and 154c are formed in the vicinity of the openings of the upper stopper 153 and the side stopper 154. Therefore, the operability at the time of attaching and detaching the bucket 5 is not impaired.

(3) Second Reference Example <Configuration of Rotor Yoke>
Centrifuge in the second reference example, since in the embodiment of the present invention is the same as the centrifuge 100 (FIG. 1), here omitted for convenience the description, swing rotor in the embodiment of the present invention Instead of the 120 rotor yoke 130, only the bucket holding portion 171 of the rotor yoke in the second reference example different from the embodiment of the present invention will be described as shown in FIG. To do.

The bucket holding portion 171 holds the pin 5c of the bucket 5 in a locked state, and has a yoke groove 172 formed in a shape peculiar to the second reference example , and the opening of the yoke groove 172 is a rotor yoke. The rotation center hole 3 is directed upward in parallel with the rotation center axis 3a.

  The bucket holding portion 171 has a yoke groove 172 having a substantially triangular cross-sectional shape that can accommodate the pin 5c of the bucket 5 that is accommodated from an upwardly directed opening parallel to the rotation center axis 3a of the rotation center hole 3. Is formed.

  The bucket holding portion 171 regulates upward movement of the pin 5c and the arcuate storage surface 137 that holds the pin 5c of the bucket 5 when the bucket 5 is mounted or in a centrifugal operation state. Therefore, the upper stopper 133 formed with the upper wall as a horizontal surface 133a is connected to the storage surface 137 and the upper stopper 133, and the pin 5c is inclined so as to easily come into contact with the pin 5c when moving upward in the figure. In order to restrict the movement of the pin 136 and the pin 5c in the horizontal direction, the inner wall is formed as an inclined surface 174a and a vertical surface 174b, and is formed so as to protrude from the upper stopper 133 toward the rotation center axis 3a. A side stopper 174 is provided. That is, in the bucket holding portion 171, the yoke groove 172 is configured by the storage surface 137, the upper stopper 133, the inclined surface 136, and the side surface stopper 174.

  The upper stopper 133 is formed with an R-shaped chamfer 133b and a chamfer 133c at the tip connected to the contact surface 133a. The side stopper 174 is formed with an R-shaped chamfer 174c at the corner of the opening connected to the vertical surface 174b. Thereby, when the pin 5c of the bucket 5 is finally extracted from the yoke groove 172, it is configured to be easily extracted from the opening.

<Pin movement during tube extraction operation corresponding to phenomenon 1>
Thus, in the rotor yoke in which the yoke groove 172 is formed, as shown in the phenomenon 1, when the tube 11 accommodated in the tube 5b of the bucket 5 is extracted from the tube 5b, the other end of the pin 5c of the bucket 5 is moved upward. When the force that lifts up is applied, the other end of the pin 5c of the bucket 5 floats upward along the inclined surface 136 as shown by the broken line arrow, contacts the horizontal surface 133a of the upper stopper 133, and moves upward. Is regulated. Further, even when the pin 5c is moved in the direction of the rotation center axis 3a from that state, after contacting the vertical surface 174b of the side surface stopper 174, the pin 5c is placed on the storage surface 137 along the inclined surface 174a by its own weight. Return.

  That is, the pin 5c of the bucket 5 loops inside the yoke groove 172 so as to draw a triangle along the inner wall of the yoke groove 172 and returns to the original storage surface 137. The user dares to remove the pin 5c from the opening. The pin 5c of the bucket 5 never comes off the yoke groove 172 unless it is lifted up.

<Pin movement during tube removal operation corresponding to phenomenon 2>
As shown in FIG. 9, the yoke groove 172 formed in the bucket holding portion 171 is provided with a side surface stopper 174, so that the user holds the upper end portion 11a of the tube 11 as shown in phenomenon 2. When the tube is pulled out in the direction of the arrow P as shown in FIG. 23 in the state of being firmly held, the pin 5c of the bucket 5 moves in the direction toward the rotation center axis 3a together with the tube 11. However, after the pin 5c runs up the inclined surface 174a of the side stopper 174, the pin 5c comes into contact with the vertical surface 174b, and the movement in the direction of the rotation center axis 3a is restricted.

  Thereafter, when the tube extraction operation of the tube 11 is completed, the pin 5c falls from the vertical surface 174b along the inclined surface 174a by its own weight, and returns to the original storage surface 137. As described above, since the vertically long vertical surface 174 b is formed on the side surface stopper 174, the pin 5 c is prevented from getting over the side surface stopper 174.

  In this case, when the user finally tries to remove the pin 5c of the bucket 5 from the yoke groove 172, chamfers 133b, 133c, and 174c are formed in the vicinity of the openings of the upper stopper 133 and the side stopper 174. It will be smoothly pulled out without being caught, and the operability when attaching and detaching the bucket 5 will not be impaired.

<Other embodiments>
In the above-described embodiment of the present invention, the case where the bucket 5 having the configuration in which the two pipes 5b as shown in FIG. 14 are held by the pipe hooks 5a is used as the mounting target of the rotor yoke will be described. However, the present invention is not limited to this, and FIGS.
As shown in FIG. 4, a bucket 51 having a configuration in which one tube 5b is held by a tube hook 51a, a bucket 52 having a configuration in which a tube 52b thicker than the tube 5b is held by a tube hook 52a, a plurality of (in this case, six) ), The bucket 53 having a configuration in which a tube 53b capable of storing a tube is integrally held by a tube holder 53a, and a bucket 54 having a configuration in which a plurality (six in this case) of tubes 5b are held by a tube hook 54a are to be mounted. You may make it use as.

Further, in the above-described embodiment of the present invention , the case where the bucket holding part 131 of the rotor yoke 130 having the configuration shown in FIG. 5 is used has been described, but instead of the upper stopper 133 of the bucket holding part 131. The upper stopper 153 of the bucket holding part 151 in the first reference example may be provided, or the side stopper 154 of the bucket holding part 151 in the first reference example may be provided instead of the side stopper 134 of the bucket holding part 131. good.

Further, in the first reference example described above, the case where the bucket holding portion 151 having the configuration as shown in FIG. 8 is used has been described. However, instead of the side stopper 154 of the bucket holding portion 151 , the second holding portion 151 is used . You may make it provide the side surface stopper 174 of the bucket holding | maintenance part 171 in a reference example .

  DESCRIPTION OF SYMBOLS 1,130 ... Rotor yoke, 2,132,152,172 ... Yoke groove, 3 ... Rotation center hole, 5 ... Bucket, 10,120 ... Swing rotor, 11 ... Tube, 100 ... Centrifuge, 101 ... Case, 102 ... Hinges, 103 ... Chamber lid, 104 ... Drive motor, 105 ... Vibration isolation means, 106 ... Door lock, 107 ... Chamber, 108 ... Chamber edge rubber, 109 ... Motor cover rubber, 110 ... Operation panel, 111 ... Control knob 112, 151, 171 ... Bucket holding part, 133, 153 ... Upper stopper, 134, 154, 174 ... Side stopper, 136 ... Inclined surface, 137 ... Storage surface, 138 ... Opening.

Claims (2)

Centrifugation attached to the drive shaft of the drive motor in a state of having a plurality of buckets housed in a rotating body chamber provided inside the housing and detachably and rotatably locked to the bucket holding portion of the rotor yoke In machine swing rotor,
A yoke groove for locking the bucket pin is formed in the bucket holding portion,
The yoke groove is
An arcuate storage surface on which the pin is held in a centrifugal operating state;
An upper stopper in which the upper wall is formed as a horizontal plane in order to restrict the upward movement of the pin;
An inclined surface connecting the storage surface and the horizontal surface;
The inner wall is formed as an arcuate contact surface to restrict the movement of the pin in the horizontal direction, and the rotation center axis is gradually lowered as the upper end portion is separated from the rotation center axis of the swing rotor. And a side stopper formed as an inclined portion inclined by a predetermined angle with respect to
The centrifuge swing rotor according to claim 1 , wherein a tip portion of the upper stopper is provided at a position overlapping with the inclined portion of the side stopper in the vertical direction . A housing,
A rotating body chamber provided inside the housing;
A swing rotor that is housed in the rotating body chamber and is attached to a drive shaft of a drive motor in a state of having a plurality of buckets that are detachably and rotatably locked to a bucket holding portion of a rotor yoke,
A yoke groove for locking the bucket pin is formed in the bucket holding portion,
The yoke groove is
An arcuate storage surface on which the pin is held in a centrifugal operating state;
An upper stopper in which the upper wall is formed as a horizontal plane in order to restrict the upward movement of the pin;
An inclined surface connecting the storage surface and the horizontal surface;
The inner wall is formed as an arcuate contact surface to restrict the movement of the pin in the horizontal direction, and the rotation center axis is gradually lowered as the upper end portion is separated from the rotation center axis of the swing rotor. And a side stopper formed as an inclined portion inclined by a predetermined angle with respect to
The centrifuge according to claim 1 , wherein a tip portion of the upper stopper is provided at a position overlapping with the inclined portion of the side stopper in the vertical direction .