JP4539822B2 - centrifuge - Google Patents

Description

The present invention relates to a centrifuge having an improved structure for ensuring safety with respect to a rotating body of the centrifuge .

In a centrifuge, the rotor, which is a rotating body containing a sample to be separated, rotates at a high speed. Safety requirements for laboratory centrifuges are specified in the international standard IEC61010-2-0202, and the structure that can ensure safety even if the rotor breaks in half during high-speed rotation as the maximum possible accident It is demanding to be. Specifically, there are restrictions on the containment of rotor debris and the movement of the centrifuge .
Conventionally, as a means for containing this destruction energy, there is a structure in which a protective wall (protector) is provided on the outer periphery of the rotating chamber to absorb the energy of large pieces. In a centrifuge that handles biological samples, a cooling pipe that directly cools the rotating chamber is wound around the outer periphery to cool the rotor, and the outer periphery is sealed with a heat insulating material such as foam to prevent heat dissipation and condensation. It is out. The protector is further arranged on the outer periphery thereof, and the thickness of the protector and the method of arranging the protector in the frame are designed according to the rotational energy of the rotor.
In addition, a door that opens and closes in the upper part of the rotating chamber is provided for taking in and out the rotor and the sample to be separated. Unlike the protector, since the user can open and close the door, it is necessary to lock the door when the rotor rotates, and a structure in which the door lock is not released even if the rotor is broken as described above is required.

JP-A-8-52382

An example of the prior art is shown in FIG. In order to contain the energy at the time of destruction of the rotor, the energy is absorbed by deforming the protector on the outer periphery of the rotating chamber or rotating the protector . Further, in order to lock the door 41 above the rotating chamber, a door hook 42 provided with a locking hole is disposed on the back side of the door 41, and the door 41 is locked by a door lock mechanism 60 fixed to the frame 43 side. . The hook plate 44 connected by the pin 50 is operated by the operation of the plunger 49 of the solenoid 48. The hook plate 44 rotates around the shaft 45. The hook plate 44 is held in a locked position by a tension spring 47 while the solenoid 48 is not energized, and is pulled downward by the plunger 49 when energized to maintain the unlocked state. These door lock mechanisms 60 are generally attached to the frame 43 side as a single assembly in which a lock mechanism portion comprising a hook plate 44 and a drive mechanism portion for driving the lock mechanism portion are attached to the door lock holder 51. is there. However, due to its structure, the door lock mechanism 60 needs to be arranged on the outer peripheral side of the protector.

In the case of the door lock mechanism 60 described above, when the amount of deformation of the protector increases due to the breaking energy when the rotor breaks, the lock mechanism 60 is hit. In the worst case, the door lock mechanism 60 is broken, and the door lock mechanism 60 is moved to the frame 43. to fall off from, there is a risk that impair the locking function of the door 4 1. In order to avoid this, the door lock mechanism 60 has been devised to increase the distance from the protector in anticipation of the amount of deformation of the protector, or to increase the thickness of the protector to reduce the amount of deformation of the protector. As the thickness of the protector increases, the cost increases and the mass increases, the assembling workability deteriorates, and further, the door 41 and the centrifuge increase in size by separating the mounting position of the door lock mechanism 60 from the protector. In addition, there is an example in which the door lock mechanism 60 is arranged on the upper side of the table with little influence of the deformation of the protector or provided inside the door 41. In the former case, the table surface 52 (work surface) becomes higher, and the latter In this case, there is a problem that the door 41 becomes heavy and the operability is deteriorated.
An object of the present invention is to provide a centrifuge having an inexpensive door lock structure that eliminates the above problems, saves the centrifuge while maintaining safety, and is easy to manufacture.

The object is to provide a rotor that is rotated by a motor, a rotating chamber that houses the rotor, a door that opens and closes the rotating chamber, a door hook that extends downward from the lower surface of the door and has a locking hole, and the door hook. The lock bar is movably provided so that it can be engaged with the hole of the door, and the lock bar is always engaged with the hole of the door hook, and the lock bar is moved from the hole of the door hook during driving to release the engagement with the door hook. A centrifuge having a door hook drive mechanism portion, a rotating chamber, and a frame for accommodating the door hook drive mechanism portion, wherein the door lock is controlled by the door hook drive mechanism portion. A cylindrical protector provided, a groove provided to open downward at the end of the lock bar, and the door hook drive mechanism, and the lock bar at the tip. And a pin for moving the lock bar engages the groove, movably attached to via a holder in a table provided on the upper surface of the frame as well as placing the locking bar above the upper surface of the protector Can be achieved.

According to the present invention, even if the protector is deformed when the rotor is broken and hits the drive mechanism portion of the door lock mechanism portion , and the door lock mechanism portion is damaged, only the door lock drive mechanism portion is detached and the door lock mechanism portion is since the lock of the door without affecting it in what ensures, it is possible to reduce the gap between the door locking mechanism and the protector further, it is possible to select the thickness of the minimum protector, space saving of the centrifuge Therefore, it is possible to provide a centrifuge having an inexpensive structure that is easy to manufacture.

A cross-sectional view of an embodiment of a centrifuge according to the present invention is shown in FIG. Inside the frame 6 is a rotating chamber 15 in which a rotor 17 into which a sample to be separated is rotated rotates. The rotor 17 is set on a drive motor 16 to rotate and separate. The outer periphery of the rotary chamber 15 are sown cooling pipe, the outer side is surrounded by a heat insulating material. Further, there is a cylindrical protector 12 on the outer periphery for protection when the rotor 17 is broken.

An openable / closable door 1 is provided above the rotating chamber 15 so that the rotor 17 can be taken in and out. There are two locking mechanism portions 19a and 19b so that the door 1 does not open during rotation. The locking mechanism portions 19a and 19b are fixed to the table 5 and below the driving mechanism portions 18a and 18b for driving the locking mechanism portions 19a and 19b. is there. Locking hooks 2 a and 2 b are provided below the door 1 to be opened and closed, and the door 1 is locked by fixing the hooks 2 a and 2 b so that the door 1 cannot be opened and closed while the centrifuge 25 is in operation.

  FIG. 2 shows details of the door lock mechanism portion 26 including the lock mechanism portion 19a and the drive mechanism portion 18a. FIG. 2 is a cross-sectional view of the door lock mechanism 26 shown in FIG.

The door hook 2a attached to the lower side of the door 1 is provided with a hole in which the lock bar 3 (engaging member) is engaged. When the door 1 is closed and the start switch 28 of the input unit 27 is turned on, the control device 30 is provided. The energization of the solenoid 10 is stopped via the, and before rotating the rotor 17, the lock bar 3 enters the hole of the door hook 2 a by the weight of the weight 13 or the tension of the spring 14, which will be described later , and the door 1 opens upward. Stop .

  The lock bar 3 is guided in the horizontal hole of the holder 11 fixed to the table 5 and can move in the horizontal direction (lateral direction). A U-groove 4 is provided on one side of the lock bar 3 so as to have an opening below, and a pin 20 is provided on the upper portion of the link bar 8a in a substantially U shape as shown in FIG. The pin 20 slides the lock bar 3 in the horizontal direction through the U groove 4. The link bar 8a can swing about the link shaft 9 as a fulcrum, and is driven by a solenoid 10 connected via a spring 32.

  The solenoid 10 is of a suction type (sucked in the direction of the arrow 24 when the power is turned on), and when the start switch 28 of the input unit 27 is turned on, the control device 30 stops supplying power to the solenoid 10. Therefore, the suction force of the solenoid 10 is lost, the plunger 10a cannot be sucked, and the lock bar 3 is moved by the spring 14 connected to the link bar 8a so as to be engaged with the hole of the hook 2a to be locked.

Further, when the operation under the operation condition input from the input unit 27 is completed, or when the stop switch 29 is turned on and the rotation of the rotor 17 is stopped, the control device 30 is energized to the solenoid 10. the plunger 10a is sucked by controlling, by moving the link bar 8a to a position written by the two-dot chain line in FIG. 2, the structure in which the lock bar 3 is locked out from the hole of the hook 2a is released It has become.

A weight 13 is attached to the end of the link bar 8a to adjust the position of the center of gravity of the movable part (link bar 8a and plunger 10a ) so that the lock is not released by an impact. Further, the position of the link bar 8 a is detected by the sensor 21, and the lock state of the door 1 is checked by the control device 30 based on the detection signal from the sensor 21.

  The solenoid holder 7 having a substantially L-shape has a solenoid 33 and a screw 33 via screw holes 7a and 7b in a state where the link bar 8 is assembled with screws via the link shaft 9 (drive mechanism portion 18a). Is fixed to the frame 6 by. The lock bar 3 is incorporated in advance in the holder 11 fixed to the table 5 at a position higher than the protector 12, and is incorporated separately from the drive mechanism portion 18 a incorporating the solenoid 10, and the U-groove of the lock bar 3 is incorporated. 4 is connected by hooking the pin 20 of the link bar 8a.

The driving portion 18a as shown in FIG. 1 are located outside of the protector 12, the locking mechanism 19a19b is left two locations of the door, in a higher position than the upper end surface of the protector 12, the protector 12 is moved However, it is in a position where it does not collide directly.

In the maximum anticipated accident, as described above, the rotating rotor 17 is often in a mode in which it is broken in half. FIG. 4 shows a longitudinal sectional view showing the deformation and behavior of the protector 12 when the rotor 17 is broken. The rotor pieces 17a and 17b broken in half jump out in the tangential direction of rotation and collide with the side surface of the rotating chamber 15 and the protector 12.

The thickness of the protector 12, the row data broken pieces 17a collides, but deforming the protector 12 by 17b, preventing low data broken piece 17a, a low data broken piece 17a without 17b penetrates the protector 12, the scattering of 17b It has a thickness that can be Portion having the maximum amount of deformation of the protector 12 when the rotor breakdown, in substantially vertical direction central portion near the maximum outer diameter portion around the protector 12 in the rotor 17, further protector 12 is oval as described in FIG. 4 It transforms into a shape . However, the vicinity of the opening portions at both ends of the protector 12 is not significantly deformed.

As shown in FIG. 2, the protector 12 is deformed as indicated by a broken line in the direction of the arrow 22 and collides with the link holder 18a of the drive mechanism 18a and the solenoid holder 7 to which the solenoid 10 is fixed. Solenoid holder 7 is fixed to the frame 6 by screws 33, since the other end (the solenoid 10 side) is not fixed, since the solenoid holder 7 is deformed in a direction away from the table 5 as indicated by an arrow 23, locking the door 1 Since the pin 20 engaged with the U groove 4 of the lock bar 3 is disengaged from the opening side of the U groove 4 of the lock bar 3, the pin 20 is not affected by the movement to the lock bar 3 and the locked state is maintained. It will be.

Further protector 12, so rotates in the direction of the arrow 31 indicating the direction of rotation of the rotor 17 by the row data broken pieces 17a, 17b that destroyed, fractured low data broken pieces 17a, while rotating the protector 12 which is deformed by 17b driving The pin 20 engaged with the U groove 4 of the lock bar 3 that locks the door 1 even if it collides with the mechanism portion 18a is disengaged to the opening side of the U groove 4 of the lock bar 3, so The locked state is maintained without affecting the movement.

Furthermore, since the lock mechanism 19a is located higher than the protector 12, the deformed protector 12 does not directly collide. Similarly, the same applies to the lock mechanism 19b and the drive mechanism 18b.
As a result, the door 1 is kept locked, and the rotor fragments 17a and 17b can be contained.

Sectional drawing which shows one Embodiment of the centrifuge used as this invention. The cross-sectional detail drawing which shows one Embodiment of the centrifuge used as this invention. The perspective view which shows one Embodiment of the drive mechanism part of this invention. The longitudinal cross-sectional view which shows a protector deformation | transformation and behavior when a rotor breaks in one Embodiment of the centrifuge used as this invention. Sectional drawing which shows an example of the conventional lock mechanism.

1 door, 2a, 2b are door hook, 3 locking bar, the U-groove 4, the table 5, the frame 6, 7 solenoid holder, 8a is re Nkuba, the link shaft 9, 10 is a solenoid 11 the holder , 12 is a protector, 13 is a weight, 14 is a spring, 15 is a rotating chamber, 16 is a drive motor, 17 is a rotor, 17a and 17b are broken rotor pieces, 18a and 18b are drive mechanisms, and 19a and 19b are locked. The mechanism part, 20 is a pin, 21 is a sensor, 22 is the direction of deformation of the protector, 23 is the direction in which the drive mechanism part collided with the protector moves, and 24 is the suction direction when energizing the solenoid.

Claims (1)

A rotor that is rotated by the motors, a rotation chamber accommodating the rotor, a door that closes the rotation chamber to open, extending downwardly from the lower surface of the door, a door hook having a hole for the lock, of the door hook A lock bar that is movably provided so as to be engageable with the hole, and the lock bar is always engaged with the hole of the door hook, and the lock bar is moved from the hole of the door hook during driving to engage with the door hook. A centrifuge having a door hook drive mechanism portion for releasing the door, a frame for accommodating the rotating chamber and the door hook drive mechanism portion, and controlling the door lock by the door hook drive mechanism portion,
A cylindrical protector provided on the outer periphery of the rotating chamber, a groove provided to open downward at the end of the lock bar, and driven by the door hook drive mechanism, and engaged with the groove of the lock bar at the tip. And a pin for moving the lock bar, and the lock bar is installed above the upper surface of the protector and is movably attached to a table provided on the upper surface of the frame via a holder. Centrifuge.

Images