JPH0852382A - Door lock device for centrifuge - Google Patents

Abstract

PURPOSE:To make a lock mechanism of a door for blocking a rotor room of a centrifuge sure and to improve safety of the centrifuge by making a lock lever not to move by an inertia force of a solenoid iron core and balancing it by a counter weight caused by shock in the case when a rotor is broken. CONSTITUTION:A rotor, a rotor room for storing the rotor, a door 1 for making the rot,or room blockable, a door hook 2 fixed on the door 1, a lock lever 11 hooking the door hook 2 and blocking opening the door 1 and a solenoid 14 with an iron core for operating the rock lever 11 are provided. In the door lock device of the centrifuge, a counter weight 13 is provided on the lock lever 11. Namely, by providing the counter weight for balancing the solenoid iron core, it is possible to improve safety of the centrifuge without releasing door lock caused by the shock in the vertical direction in the case when the rotor is broken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door locking device provided in a centrifuge.

[0002]

2. Description of the Related Art A conventional door lock device will be described with reference to FIG. The lock lever 35 is attached to the door lock base 10 at a fulcrum 12. While the rotor is rotating, the door solenoid 14 is not energized and the lock lever 35 is pulled by the spring 17 to be caught by the door hook 2 to lock the door. When the rotor is stopped, a voltage is applied to the solenoid 14 to attract the solenoid iron core 15. Solenoid iron core 1
5 and the lock lever 35 are connected by a pin 16, and when the solenoid iron core 15 is attracted, the lock lever 35 opens around the fulcrum 12 to release the door lock. When the rotor is broken during the rotation of the rotor, the centrifugal force is applied to the centrifugal machine in the rotational direction and the upward direction, and the centrifugal machine is rotationally moved.
Further, when a vertical shock is applied to the door lock device, the solenoid iron core is relatively lowered by the inertial force of the solenoid iron core 15, the lock lever 35 is opened, the door hook 2 is disengaged, and the door is opened. Further, the angle of the claw portion of the lock lever is 90 degrees, so that the claw portion is hooked vertically to the door hook 2. When a broken piece of the rotor hits the door 1 obliquely upward when the rotor is broken, the door hook 2 attached to the door 1 pulls the claw of the lock lever 35 obliquely upward. Since the above-mentioned vertical impact and the pawl of the lock lever are pulled obliquely, the lock lever 35 is easily detached from the door hook 2.

[0003]

The centrifuge used in the separation of blood, cells, chemical substances and the like in medicine and laboratories has high rotational energy. Therefore, when the rotor breaks due to fatigue of the rotor that contains the sample or a mistake in setting the sample, the surroundings of the rotor chamber are reinforced so that the debris of the rotor does not scatter from the rotor chamber of the centrifuge. The opening is covered with a door and equipped with a door lock device to prevent the door from opening when the rotor is rotating or when the rotor is destroyed. In the conventional door lock device, as shown in FIG. 11, a lock lever is attached to a door lock base at a fulcrum, and moves about the fulcrum. One end of the lock lever is pulled to the side surface of the door lock base by a spring, and the solenoid iron core is attached to the other end by a pin. A door hook that is locked by a door lock device is fixed to the door. When the rotor is stopped, the solenoid is energized to attract the solenoid iron core. The lock lever opens around the fulcrum and unlocks the door. When the rotor is rotating, the solenoid is turned off and the lock lever is pulled by the spring to be caught by the door hook and lock the door. When the rotor breaks, the debris hits the walls and doors inside the rotor chamber, and the centrifuge is subject to rotational and upward impacts. Then, a vertical impact is transmitted to the door lock device, and the solenoid iron core is relatively lowered by the inertial force of the solenoid iron core. There was a problem that the lock lever opened, the door hook came off, and the door opened because the solenoid iron core dropped due to the impact of the rotor destruction.

Further, the angle of the claw portion of the lock lever for hooking and locking the door hook is 90 degrees, so that the claw is hooked perpendicularly to the door hook. When the rotor is destroyed, the rotor fragments are scattered by the rotating force,
It often hits the door diagonally upward. The door is impacted diagonally upward by the rotor fragments, and the door hook fixed to the door pulls the pawl of the lock lever diagonally upward. Since the vertical impact of the door lock device and the pawl of the lock lever are pulled obliquely, the lock lever is easily disengaged from the door hook, and there is a problem that the door opens. When the door is opened when the rotor is broken, the rotor debris jumps out of the rotor chamber and becomes very dangerous.

An object of the present invention is to solve the above-mentioned problems, to reliably lock the door even when the rotor is damaged and to improve the safety of the centrifuge.

[0006]

The above object is achieved by providing the lock lever with a counterweight for balancing the solenoid iron core so that the lock lever is in the door lock state. Further, in order to prevent the door from being unlocked by the impact in the rotating direction (horizontal direction), the counterweight center of gravity is balanced with the lock lever claw with respect to the fulcrum. Also, instead of the counterweight, the center of gravity of the lock lever is located on the side opposite to the mounting part of the solenoid iron core, and the lock lever has a counterweight function so that the door is locked by the weight of the center of gravity of the lock lever. To be done. Even if the lock lever has a counterweight function, the lock lever center of gravity and the lock lever claw should be balanced against the fulcrum in order to prevent the door from being unlocked by the impact in the rotating direction (horizontal direction). It is achieved by
Further, in order to prevent the lock lever from coming off by pulling the door hook upward or obliquely upward, it is achieved by setting the angle of the claw of the lock lever to less than 90 degrees. Or the state where the lock lever is hooked on the door hook (lock state)
Is less than 90 degrees. Also,
By making the fulcrum hole of the lock lever a vertical play, an elongated hole, or multiple arcs, when the door hook is pulled by the rotor fragment, the upper part of the lock lever will hit the top surface of the door lock base and the lock lever will not open. It is achieved by Further, by providing a protrusion on the door lock base with which the upper portion of the lock lever hits when the door hook is pulled, the lock lever is prevented from opening and the above object can be achieved.

[0007]

In the door lock device constructed as described above, an inertial force is generated in both the solenoid iron core and the counterweight attached to the lock lever against the vertical shock generated when the rotor is broken, and the fulcrum is applied to the fulcrum. Therefore, the solenoid iron core does not move, and the door hook remains caught on the lock lever. Therefore, the door remains locked. Even if the center of gravity of the lock lever is set to the opposite side of the solenoid iron core mounting part instead of the counterweight, the inertial force generated in the center of gravity of the lock lever and the inertial force of the solenoid iron core are balanced, and the same as above. In addition, the door remains locked. If the angle of the lock lever claw is less than 90 degrees, even if the door hook is pulled obliquely upward, the door hook will bite into the claw of the lock lever, so that the lock lever is not opened and the door remains in the locked state. Similarly, by setting the angle of the state where the lock lever is hooked on the door hook (lock state) to less than 90 degrees, the same as the above is achieved and the door maintains the lock state. Further, by forming the fulcrum hole of the lock lever as an elongated hole, a multi-circular arc or a large backlash hole, when the door hook is pulled due to collision of rotor fragments, the lock lever slides upward. The sliding lock lever hits the upper surface of the door lock base, and the lock lever sandwiched between the door hook and the door lock base does not open and the door is maintained in the locked state.

Further, by providing a projection on the surface of the door lock base against which the upper portion of the lock lever hits, when the rotor is broken, the lock lever is sandwiched between the door hook, the door lock base and the projection, and cannot be moved, so that the door is maintained in the locked state.

[0009]

EXAMPLES Hereinafter, examples will be described. In FIG. 1, a door hook 2 is fixed to a door 1 for closing the rotor chamber. The centrifuge frame 3 is provided with a door lock device so that the door is not opened during rotation of the rotor or when the rotor is broken in order to maintain safety. In the door lock device, a lock lever 11 is attached to a door lock base 10 at a fulcrum 12 so that the door lever can move about the fulcrum 12. A counterweight 13 is fixed to one end of the lock lever 11, and a solenoid iron core 15 is attached by a pin 16 to the opposite side. When the rotor is stopped, the solenoid 14 is energized to attract the solenoid iron core 15. Rock Lever 11
Moves so as to open around the fulcrum 12, and the claw portion of the lock lever 11430000 comes off from the door hook 2 to unlock the door. When the rotor is rotating, the solenoid 14 turns off the power. Due to the weight of the counterweight 13 and the solenoid iron core 15, the lock lever 11 is in a state of being almost balanced with respect to the fulcrum 12. Therefore, the claw portion of the lock lever 11 moves until it hits the side surface of the door lock base 10, and the lock lever 11 is caught by the door hook 2 to lock the door.

When the rotor breaks during rotation, the debris hits the walls and doors inside the rotor chamber, and the centrifuge receives an impact in the direction of rotation of the rotor and in the upward direction. Centrifuges used in the separation of blood, cells, chemicals, etc. in medicine and laboratories are usually installed horizontally with a level base and bolts, so the contact area with the floor is increased and the horizontal friction force is increased. Is increasing. Therefore, when the rotor is broken, a vertical shock is transmitted to the door lock device. Solenoid iron core 15 due to impact
Causes an inertial force to the solenoid iron core 15 to lower, but a similar inertial force also occurs to the counterweight 13,
Balance against fulcrum 12. Therefore, the lock lever 11 does not move, the door lock 2 remains hooked on the lock lever 11, and the door maintains the locked state.

Further, recently, there is a centrifuge which uses a caster for moving the centrifuge so as to be horizontal. In that case, compared to the case where the level base is used, the contact area with the floor is reduced, and the impact in the rotation direction (horizontal direction) is easily transmitted to the door lock device.

In FIG. 1, since the solenoid iron core 15 is inserted in the solenoid 14, it can move only in the vertical direction. However, if the weight of the counterweight center of gravity 18 and the weight of the lock lever claw are not balanced, the counterweight 13 and the lock lever claw try to move toward the side where the inertial force generated in the counterweight 13 and the lock lever claw is large. The lock lever 11 moves in the opening direction by the force having the larger inertial force, and the door lever 2
Comes off and unlocks the door.

FIG. 2 shows an embodiment in which FIG. 1 described above is improved. The structure of the door lock device is the same as that of FIG. 1 and FIG. 2, and in the normal operation of the centrifuge, the same operation as described above is performed. In FIG. 2, when the rotor is broken, the counterweight 20 and the solenoid iron core 15 are balanced in the vertical direction in the same manner as described above, the lock lever 11 does not move, and the door maintains the locked state. For lateral impact, fulcrum 1
On the other hand, since the counterweight center of gravity 21 and the weight of the lock lever claw portion are balanced with respect to 2, the inertial force generated in the claw portion of the counterweight 20 and the lock lever 12 is offset. Therefore, the door remains locked.
The spring 17 is attached so as to be pulled to the counterweight side of the lock lever 11 and plays an auxiliary role when locking the door. Therefore, if the balance between the solenoid iron core and the counterweight is set so that the door is locked, the spring 17 may be omitted.

FIG. 3 is a diagram showing an embodiment of a door lock device in which a lock lever has a function of counterweight. The operation of the door lock device is the same as that described with reference to FIG. The lock lever center of gravity 26 is on the opposite side of the fulcrum 12 from the solenoid iron core 15. Then, the weight of the lock lever 25 and the weight of the solenoid iron core 15 are close to being balanced at the fulcrum 12. Therefore, even if the counter weight is not provided, the door remains in the locked state as described above.
In FIG. 3, the lock lever center of gravity 26 and the lock lever 2 are shown.
If the weights of the claws of No. 5 are also balanced, lateral impact is further improved.

FIG. 4 is a view of a claw portion of the lock lever according to the present invention, and FIG. 5 is a claw portion of a conventional lock lever. When the rotor is broken, the rotor fragments scattered by the rotating force often hit the door diagonally upward. Doors and door hooks
A force that pushes upward or diagonally upward is applied. As shown in FIG. 11, in the conventional door lock device, the lock lever 35 is hooked on the door hook 2 at a substantially right angle. As shown in FIG. 5, since the angle of the claw portion of the lock lever is 90 degrees, when the door hook 2 is pulled upward or diagonally upward, the claw portion of the lock lever 35 is deformed and the angle is 90 degrees.
It spreads more than once and moves in the direction in which the lock lever 35 comes off.
As shown in FIG. 4, if the angle of the claw portion of the lock lever is set to less than 90 degrees, when the door hook is pulled upward, the claw portion of the lock lever is pushed into the claw portion.

Further, as shown in FIG. 6, even when the angle of the claw portion of the lock lever is 90 degrees or more, the angle when the lock lever 27 hooks the door hook 2 is less than 90 degrees. For example, similarly to the above, the door hook 2 bites into the claw portion of the lock lever 27, and the door locked state is maintained.

As shown in FIGS. 7 and 8, the fulcrum hole of the lock lever 30 may be an elongated hole 31, a multi-arc hole 32, or a hole with a backlash to prevent deformation of the claw portion of the lock lever and to lock the door. Can be maintained. FIG. 9 is a diagram of the door lock device using the lock lever shown in FIG. 7 when the rotor fragment hits the door 1 and pushes the door hook 2 upward. Normally, there is a gap between the centrifuge frame 3 and the upper part of the lock lever as shown in FIG. 1, and the operation of the lock lever is the same as that described with reference to FIG. In FIG. 9, when the rotor fragments hit the door 1, the door hook 2 is pulled. Since the fulcrum 12 part to which the lock lever 30 is attached has an elongated hole 31, when the door hook 2 is pushed up, the lock lever 30 is also pulled up to the door lock base 10.
Hit the top surface of. The lock lever 30 is sandwiched between the door hook 2 and the door lock base 10, and the door is maintained in the locked state.

Further, as shown in FIG. 10, the door lock base 1
When the protrusion 33 is attached to 0, when the door hook 2 is pulled upward, the lock lever 30 is fixed by the protrusion 33 and the upper surface of the door hook 2 and the door lock base 10, and the door is kept in the locked state.

[0019]

According to the present invention, by attaching a counter weight that balances with the solenoid iron core, the safety of the centrifuge can be ensured without the door being unlocked due to a vertical impact when the rotor is broken. Can be improved.
In addition, the center of gravity of the counterweight and the weight of the lock lever claw are balanced with respect to the fulcrum, so the door is not unlocked even when a lateral impact is applied, improving the safety of the centrifuge. You can Also, the center of gravity of the lock lever is on the side opposite to the solenoid iron core with respect to the fulcrum, and the center of gravity of the solenoid iron core and the lock lever are balanced, so the counterweight can be deleted and the number of parts can be reduced.
The door lock device can be simplified, and the safety of the centrifuge can be improved. Moreover, since the angle of the claws of the lock lever is set to less than 90 degrees, the door hook becomes difficult to lock and the safety of the centrifuge can be improved without opening the door. Further, even if the angle of the claw of the lock lever is 90 degrees or more, the angle when the lock lever hooks the door hook is set to less than 90 degrees, so that the safety of the centrifuge can be ensured without opening the door. Also, the fulcrum hole of the lock lever is a long hole, a multi-arc hole or a hole with play, and when the rotor is broken, the lock lever is sandwiched between the door hook and the door lock base, so the door lock does not come off and the centrifuge is safe. Can be improved.
Further, by attaching a protrusion to the door lock base, the lock lever is fixed by the door hook, the door lock base and the protrusion, and the safety of the centrifuge can be improved without the door being unlocked.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a door lock device according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the door lock device according to the present invention.

FIG. 3 is a sectional view showing still another embodiment of the door lock device according to the present invention.

FIG. 4 is a configuration diagram showing a claw portion of the lock lever according to the present invention.

FIG. 5 is a configuration diagram showing a claw portion of a conventional lock lever.

FIG. 6 is a cross-sectional view in which the engagement angle of the door lock device according to the present invention is changed.

FIG. 7 is a configuration diagram showing a rotation fulcrum of an elongated hole according to the present invention.

FIG. 8 is a configuration diagram showing a pivot of a multi-arc hole according to the present invention.

FIG. 9 is a cross-sectional view of the door lock device according to the present invention when it receives an impact of breaking a rotor.

FIG. 10 is a sectional view showing a door lock device having a protrusion according to the present invention.

FIG. 11 is a cross-sectional view showing a conventional door lock device.

[Explanation of symbols]

1 is a door, 2 is a door hook, 3 is a centrifuge frame, 10
Is a door lock base, 11 is a lock lever, 12 is a fulcrum,
13 is a counter weight, 14 is a solenoid, 15 is a solenoid iron core, 16 is a pin, 17 is a spring, 18 is a center of gravity of the counter weight, 20 is a counter weight, 21
Is the center of gravity of the counterweight, 25, 27, 30, 35 are lock levers, 31 is an elongated hole, 32 is a multi-arc hole, and 33 is a protrusion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuya Konno, 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Tsutomu Takamura 1060, Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Kenji Nagai 1060 Takeda, Katsuta City, Ibaraki Hitachi Koki Co., Ltd.

Claims (8)

[Claims] 1. A rotor, a rotor chamber accommodating the rotor, a door capable of closing the rotor chamber, a door hook attached to the door, and an engagement with the door hook to prevent opening of the door. A door lock device for a centrifuge, comprising: a lock lever for operating the lock lever; and a solenoid having an iron core for operating the lock lever, wherein the lock lever is provided with a counterweight. 2. The door lock device for a centrifuge according to claim 1, wherein the counter weight is provided on the lock lever so that a claw portion formed on the lock lever and the counter weight are balanced with each other. 3. The lock lever is provided with the function of the counterweight by setting the center of gravity of the lock lever on the side opposite to the mounting portion of the solenoid iron core with respect to the rotation fulcrum of the lock lever. The door lock device of the centrifuge according to claim 1. 4. The door lock device for a centrifuge according to claim 3, wherein a claw portion of the lock lever and a center of gravity of the lock lever are balanced with respect to the rotation fulcrum. 5. The door lock device for a centrifuge according to claim 1, wherein an angle of a claw portion of the lock lever engaged with the door hook is less than 90 degrees. 6. The door lock device for a centrifuge according to claim 1, wherein an angle when the lock lever is engaged with the door hook is less than 90 degrees. 7. The door lock for a centrifuge according to claim 1, wherein the shape of the rotation fulcrum formed on the lock lever is an elongated hole, a multi-arc hole or a hole with play. apparatus. 8. The door lock device for a centrifuge according to claim 7, wherein the lock lever can be fixed by providing a projection on the door lock base to which the lock lever is attached.