JPH04367751A - Apparatus for controlling number of rotations of rotary body for centrifugal separator - Google Patents

Abstract

PURPOSE:To prevent the rotary body of a centrifugal separator from being used in excess of the max. number of rotations. CONSTITUTION:A rotary body 1, a tube 2, a sample 3, a hub 4, a driver 5, a base 6, an evaporator 7, a heat-sensitive ring 8, bellows 9, a data holder 10 and a magnetic head 11 are provided to a rotary chamber 12. The sample 3 to be separated is received in the hermetically closed tube 2 to be inserted in the rotary body 1 and the rotary body 1 is arranged to the hub 4 to be rotated at a high speed by the driver 5. The cylindrical data holder 10 is provided to the bottom part of the rotary body 1 in close vicinity to the magnetic head 11 attached to the upper part in the rotary chamber 12. The discrimination numbers of the rotary body are allotted in the lower order of the max. use number of rotations of the rotary body itself to be stored in the rotary body and, since the change of a magnetic body changes in a direction becoming small in value, even if abnormality is generated, the max. use number of rotations is suppressed low.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed control device for a rotating body of a centrifugal separator, which rotates at a high speed with a limited maximum rotational speed and is used for a limited operating time.

0002

2. Description of the Related Art Conventional rotating bodies for centrifugal separators have the disadvantage that data such as their identification number, serial number, number of operations, etc. are erased when they are subjected to magnetic disturbance caused by bringing a magnet or the like close to them. This countermeasure includes protection by a parity check, but if the data unfortunately changes, a problem occurs in that the rotation speed exceeds the maximum number of rotations that can be used.

0003

SUMMARY OF THE INVENTION An object of the present invention is to prevent the rotating body of a centrifuge from being used at a rotation speed exceeding its maximum operating speed.

0004

[Means for Solving the Problems] In order to achieve the above object, the rotation speed control device for a rotating body for a centrifuge of the present invention is a replaceable device for separating substances of different densities using centrifugal force. A rotating body, a data holding device capable of reading and writing data such as an identification number, a serial number, and the number of times of operation on the rotating body, a memory that records maximum rotational speeds in use corresponding to the identification numbers in descending order, and a memory that stores the data. a centrifugal separator comprising: a magnetic head for reading data; means for reading data stored in the data storage device using the magnetic head when the rotating body starts rotating; and a device for reading data stored in the data storage device from the memory; Comparing the maximum rotation speed with a user-set rotation speed, if the set rotation speed exceeds the maximum rotation speed used, an alarm is issued and the operation is stopped, and if the rotation speed does not exceed the maximum rotation speed, the operation is continued. It is characterized by

[0005]

[Operation] In the centrifugal separator of the present invention, when the rotating body starts rotating, the magnetic head reads the data stored in the data holding device, and from the memory, the maximum number of rotations to be used corresponding to the identification number and the user's set rotation speed are read. If the set rotation speed exceeds the maximum number of rotations used, an alarm will be issued and operation will be stopped, and if it does not exceed the maximum rotation speed, operation will continue.
The rotating body is not rotated in a dangerous situation, and safety can be ensured. In addition, the memory records the maximum number of rotations that can be used that corresponds to each identification number in descending order, so even if the data changes due to magnetic disturbances, the rotating body will not be used beyond the maximum number of rotations that can be used. There isn't.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is a cross-sectional view of one embodiment of a rotating body for a centrifuge according to the present invention, and FIG. 2 is a cross-sectional view taken along the line II--II in FIG. In FIG. 1, 1 is a rotating body, 2 is a tube, 3 is a sample, 4 is a hub, 5 is a driving device, 6 is a base, 7 is an evaporator, 8 is a heat-sensitive ring, 9 is a bellows, 10 is a data holding device, 11 is a magnetic head and 12 is a rotating chamber. A sample 3 to be separated is inserted into a sealed tube 2 into a rotating body 1, and the rotating body 1 is installed on a hub 4 and rotated at high speed by a drive device 5. A cylindrical data holding device 10 is provided at the bottom of the rotating body 1.
is provided in the vicinity of the magnetic head 11 mounted above the rotating chamber 12. Data holding device 10 is shown in FIG. 3, which is an enlarged view of FIG. In FIG. 3, 13 is a sleeve, 14 is a magnetic thin film, and 15 is a coating material. A coating material 15 is deposited on the outer surface of the cylindrical sleeve 13, and the surface is protected by a disk 16. FIG. 4 is a block diagram of one embodiment of the present invention, FIG. 5 is a flow chart of one embodiment of the present invention, and FIG. 6 is an explanatory diagram showing the correspondence between the type of rotating body, the maximum number of rotations used, and the identification number. In FIG. 4, 17 is a centrifugal separator, 18 is an arithmetic unit, 19 is a data read/write device, and 20 is a memory. Rotating body 1
As shown in FIG. 6, the identification numbers are assigned in ascending order of the maximum number of rotations used and stored in binary numbers on the magnetic thin film 14. Now, when the rotating body 1 starts rotating, the magnetic head 1
1 reads data such as the identification number, serial number, and number of operations stored in the data holding device 10, and reads the maximum number of revolutions in use corresponding to the identification number and the number of revolutions set by the user from the memory 20 in the centrifuge 17. By making a comparison, even if the user has set a rotation speed that should not be allowed, the rotation will not occur in a dangerous state. Note that in consideration of the fact that a new rotating body 1 will be added later, the identification numbers are registered at little intervals.

[0007]

[Effects of the Invention] According to the present invention, a rotating body for a centrifuge that retains the identification number of the rotating body itself is installed, and even if the user sets the rotation speed above the maximum rotation speed of the rotating body, there is no danger. Since the rotating body is not rotated, safety can be ensured.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of a rotating body for a centrifuge of the present invention;

[Fig. 2] Cross-sectional view taken along the line II-II in Fig. 1;

[Fig. 3] Partially enlarged view of Fig. 1;

FIG. 4 is a block diagram of an embodiment of the device of the present invention;

[Figure 5]
A flowchart of an embodiment of the control of the present invention,

FIG. 6 is an explanatory diagram of an embodiment showing the correspondence between the type of rotating body of the present invention, the maximum number of rotations used, and the identification number.

[Explanation of symbols]

1... Rotating body, 2... Tube, 3... Sample, 4... Hub, 5...
Drive device, 6... Base, 7... Evaporator, 8... Heat sensitive ring, 9... Bellows, 10... Data holding device, 11... Magnetic head, 12... Rotating chamber.

Claims (1)

[Claims] 1. A replaceable rotating body for separating substances with different densities using centrifugal force, and a data holding device capable of reading and writing data such as an identification number, serial number, and number of operations on the rotating body. , a centrifugal separator including a memory for recording maximum rotational speeds in use corresponding to the identification numbers in descending order, and a magnetic head for reading the data, wherein when the rotating body starts rotating, the magnetic head reads the data. means for reading data stored in the data holding device;
The maximum number of revolutions in use corresponding to the identification number from the memory is compared with the number of revolutions set by the user, and if the set number of revolutions exceeds the maximum number of revolutions in use, an alarm is issued and the operation is stopped, and if it does not exceed the number of revolutions in use, an alarm is issued and the operation is stopped. 1. A rotation speed control device for a rotating body of a centrifugal separator, comprising means for continuing the operation as it is.