JPH10118527A - Centrifugal separation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check a rotating direction by a method which is nearly impossible for a customer by operating an operation section with a method or procedure that the customer cannot usually operate to start rotation in the open state of a door or increasing the speed of rotation only up to the number of revolutions at which the operator is prevented from entering a dangerous state in the case the operation is started to rotate. SOLUTION: The special operation for 'checking the rotating direction in the open state of the door' is executed in the operation section 9. The special operation is executed by a manufacturer or repair person in accordance with the prescribed method and procedure. When the operation is started in the open state of the door 4, the controller puts a door lock 5 into an unlocking state and passes a current for the specified time (for example, about several seconds) to a driving device 2 by disregarding the door open signal of a door sensor 6, thus rotationally driving the rotating body 1. The special operation function is released to decelerate the rotating body 1 after the lapse of the specified time. As a result, the operator is able to safely check the rotating direction of the rotating body 1. The rotating body may be accelerated up to the specified number of revolutions and may immediately be decelerated in place of passing the current for the specified time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the rotation direction of a device such as a centrifuge for rotating a rotating body at a high speed.

[0002]

2. Description of the Related Art This type of centrifugal separator is designed so that debris and the like do not fly out of the centrifuge body even if the rotating body is broken or separated. In general, a centrifuge having a low permissible rotation speed, for example, a small centrifuge that is called 4 to 5,000 rotations per minute can secure sufficient safety even if the housing and the door are made of plastic, but the higher the permissible rotation speed, the stronger the strength. It is necessary to use a high-strength material and it is covered with a high-strength material such as metal. In addition, a door lock that locks the door during rotation is provided except for some low-speed centrifuges so that the operator does not accidentally touch the rotating body while the rotating body is being taken in and out. In addition, centrifuges having this type of door lock are usually controlled so that the door is locked at the start of rotation and released at the stop, and cannot be rotated when the door is open. I have.

On the other hand, centrifuges are obliged to mark the direction of rotation, and usually an arrow of the actual direction of rotation is clearly shown at an entrance or a door through which a rotating body is taken in and out. Therefore, a person who manufactures or repairs a centrifuge needs to confirm that the rotating body is in a predetermined rotation direction. As mentioned above, if the door is a plastic centrifuge, the direction of rotation can be confirmed from the external appearance, but the centrifuge where the rotating chamber is covered with opaque material such as metal rotates with the door opened in some way You need to rotate your body and check the direction of rotation.

Conventionally, in this type of centrifugal separator, a sensor for detecting the opening and closing of the door, such as a micro switch, is temporarily operated with a hand or a tool when the door is opened, and it is as if the door is closed. In this state, the driving device was driven to check the rotation direction. Some special centrifuges require a rotating operation with the door open, and such a device is usually provided with a key so that rotation with the door open is impossible without a key. It has become.

[0005]

In recent years, there has been an increasing demand for safety. For example, if a manufacturer or a repairer can remove a safety device with a hand or a tool, a customer may perform such an operation. It is beginning to be considered. That is, in the method of checking the rotation direction described above, there is an opportunity for the customer to operate the door sensor and rotate the door with the door open, and in such a case, if the customer touches the rotating body, the customer is injured. there is a possibility. Therefore,
It is necessary to consider the design so that the door cannot be opened and rotated for operations that can be performed by the customer. In addition, the international standard on safety (IEC1010-2-020) specifies the peripheral speed of the rotating body as 2 m or less per second as a limit that can ensure the safety, but the conventional device is not limited by the above peripheral speed, As described above, when the door sensor is operated and rotated, there is a possibility that the peripheral speed may rise to 2 m / sec or more.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned disadvantages of the prior art. Instead of using a structure that does not allow the sensor to operate easily, a means for checking the direction of rotation that is almost impossible for the customer is provided. Or means for surely confirming the rotation direction within a safe range.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to operate an operation unit in a manner or procedure that cannot be normally operated by a customer and to start rotation with a door open, or to start rotation with a door open. Is achieved only by increasing the rotation speed to a rotation speed (usually low-speed rotation) that does not fall into a dangerous state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIG. In FIG. 1, a rotating body 1 containing a sample is driven to rotate by a driving device 2. The rotating body 1 is a driving device 2
There is a case where the rotating body is used in a fixed manner, and a case where the rotating body is detachably mounted so as to be used by changing a plurality of rotating bodies. The rotating chamber 3 is provided with a door 4 that can be opened and closed to close the rotating chamber 3 and a door lock 5 that locks the door so that the door 4 is not opened while the rotating body 1 is rotating. Further, for safety, the door 4 has a door sensor 6 for detecting opening / closing of the door. This is necessary in order to transmit a signal for opening or closing the door to the control device 8 and not to rotate the driving device when the door is opened.

The driving device 2 has a rotation detector for detecting the number of rotations of the rotating body 1 or the driving device 2. The door 4 is locked by the door lock 5 during rotation, and the door lock 5 is stopped when stopped. The rotating body 1 is released and the door 4 is opened.
Alternatively, the sample in the rotating body 1 can be taken out.
The control device 8 receives signals from the operation unit 9 for inputting centrifugation conditions and instructing start and stop of rotation, and controls rotation of the drive device 2 and operation of the door lock 5.

The operation and control of the control device 8 will be described below with reference to the flowcharts of FIGS. In FIG. 2, first, a special operation for “checking the rotation direction with the door open” is performed on the operation unit 9. This special operation is not performed by the customer in a normal manner and procedure, but is performed by a manufacturer or a repairer in a predetermined manner and procedure. For example, when the operation unit 9 has numeric keys 0, 1 to 9, (For example, a key is pressed in the order of 0, 0, 9, 9) or a character string is encoded and input to be recognized by the control device 8 (or a switch that cannot be touched by a customer in normal operation). Operation, for example, the operation of a switch for a manufacturer or a repairer in the device). When the door 4 is started in the open state after this operation, the control device 8
Puts the door lock 5 in the unlocked state, ignores the door open signal of the door sensor 6, and applies a current to the driving device 2 for a certain period of time (for example, about several seconds) to drive the rotating body 1 to rotate. After a lapse of a certain time, the special operation function is released and the rotating body 1 is decelerated. Thereby, the operator can safely confirm the rotation direction (clockwise or counterclockwise) of the rotating body 1. The same effect can be expected by a method of accelerating to a certain number of rotations (for example, several rotations to several tens of rotations) and immediately decelerating (including a case where the operator performs a deceleration operation) instead of flowing a current for a certain time. In any case, once the special operation function is completed, the safety can be further enhanced by preventing the "rotation with the door open" unless the special operation is performed again.

Referring to FIG. 3, a method for rotating the rotating body 1 with the door 4 opened and ensuring safety without performing a special operation from the operating section 9 will be described. When the signal from the door sensor 6 is started with the door open, the control device 8 supplies a current to the drive device 2 to rotate the rotator 1. In this case, the rotation detection signal from the rotation detector 7 has a predetermined rotation speed. The current flowing through the driving device 8 is controlled so as not to rise above Nmin ~ ¹ (for example, several tens of rotations). Alternatively, the speed may be reduced immediately after reaching the predetermined rotation speed Nmin- ¹ . As described above, the rotation speed Nmin ~ ¹ is defined in the international standard IEC1010-2-020 so that the door cannot be opened when the peripheral speed of the rotating body is 2 m / sec or more. The maximum peripheral speed of the body 1 is set to a value that does not exceed 2 m / sec. Thereby, the rotation direction can be confirmed at a safe rotation speed.

[0012]

According to the present invention, it is possible to check the rotational direction of the driving device required at the time of manufacturing and repairing a centrifuge by a method which is almost impossible by a customer's operation or a safe method and simply. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a centrifuge according to the present invention.

FIG. 2 is a flowchart illustrating the operation of FIG.

FIG. 3 is a flowchart illustrating the operation of FIG. 1;

[Explanation of symbols]

1 is a rotating body, 2 is a driving device, 3 is a rotating room, 4 is a door, 5
Is a door lock, 6 is a door sensor, 7 is a rotation detector, 8 is a control device, and 9 is an operation unit.

Claims (9)

[Claims] 1. A rotating body for accommodating a sample, a driving device for driving the rotating body, a rotating chamber for accommodating the rotating body, an openable / closable door for closing the rotating chamber, and a lock for the door A centrifugal separator comprising: means, an operation unit capable of inputting centrifugation conditions, and a control device that receives a signal from the operation unit and controls the driving device and the door lock. A centrifuge according to claim 1, wherein the door lock energizes the driving device without operating the door to lock the door, thereby driving the rotating body. 2. The centrifugal separator according to claim 1, wherein when the rotation is started by inputting a signal from the operation unit in a predetermined procedure, a current is supplied to the driving device for a predetermined time. 3. An apparatus according to claim 2, wherein when the rotation is started by inputting a predetermined procedure from the operation unit, a current is supplied to the driving device until the rotating body reaches a predetermined number of rotations. The centrifuge according to claim 1. 4. A detachable rotating body containing a sample, a driving device for driving the rotating body, a rotating chamber for rotating the rotating body, and the rotating for moving the rotating body in and out. An openable and closable door for closing the opening of the chamber, a sensor for detecting the open / closed state of the door, a door lock for locking the door, and a device for inputting centrifugal conditions and instructing rotation start and stop An operation unit, a control unit for controlling the driving device and the door lock in response to a signal from the operation unit, and receiving a signal from the sensor, and excluding when the door is closed; In a centrifuge that cannot rotate, a predetermined procedure is input from the operation unit, and if the rotation is started, the drive device is energized even when the door is open, and the rotating body is driven. That Characteristic centrifuge. 5. The centrifugal separator according to claim 4, wherein, when the rotation is started by inputting data from the operation unit according to a predetermined procedure, a current is supplied to the driving device for a predetermined time. 6. When a rotation is started by inputting a predetermined procedure from the operation unit, a current is supplied to the driving device until the rotating body reaches a predetermined number of rotations. 5. The centrifuge according to 4. 7. When inputting and rotating in accordance with a predetermined procedure from the operation unit, a current is applied to the driving device only once, and when rotating again, it is necessary to input again according to a predetermined procedure from the beginning. The centrifugal separator according to claim 1, wherein the centrifuge is provided. 8. A detachable rotating body containing a sample, a driving device for driving the rotating body, a rotating chamber for rotating the rotating body, and the rotating for moving the rotating body in and out. An openable and closable door for closing the opening of the room, and a sensor for detecting whether the door is closed or open,
A door lock for locking the door, an operation unit for inputting centrifugal conditions and instructing rotation start and stop,
In a centrifugal separator having a drive device and a control device for controlling the door lock in response to a signal from the operation unit, when a rotation start operation is performed with the door open, a certain rotation speed A centrifugal separator characterized by not rotating above. 9. The centrifugal separator according to claim 8, wherein when the rotation is started with the door opened, the maximum peripheral speed of the rotating body does not rise more than 2 m / sec. Machine.