JPH04166249A - Controlling device for service life of rotor in centrifugal separator - Google Patents

Abstract

PURPOSE:To surely control the service life of the rotor for a centrifugal separator by narrowing the width of a memory element in comparison with the width of a recording head. CONSTITUTION:A memory element 21 which memorizes the service life controlling data of a rotor 1 is provided to the rotor 1 being rotated at high velocity to centrifuge a sample to be separated. Further a recording head 8 reads in the data on the memory element 21 and also writes new data thereon. This recording head 8 is arranged to the position opposite to the memory element 21. The width of the memory element 21 is narrowed in comparison with the width of the recording head 8. As a result, even when the relative position of the memory element 21 and the recording head 8 is changed, the double recording of the service life controlling data is prevented. The newest service life controlling data are always and accurately memorized to the memory element 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to life management for managing the life of a centrifugal separation transport rotor, which has a finite life.

[Background of the invention]

The rotor used in a centrifugal separator called an ultracentrifuge is required to obtain high centrifugal acceleration, so it operates at extremely high speeds (for example, 83,000 m).
Since it is necessary to rotate the rotor at in-1), the centrifugal stress acting on the rotor is designed to exceed the fatigue limit of the material, and the rotor has a finite life. Therefore, rotors usually have a specified lifespan based on the number of operations and cumulative operating hours (for example, 5,000 operations or 10,000 hours), and rotors that reach the end of their lifespan must be discontinued and disposed of at that point. ing.

In order to manage life management data such as the number of times the rotor has been operated and the cumulative operating time, a data holding device having a magnetic thin film provided on the surface is provided at the bottom of the rotor.

A patent application filed in 2001-3 describes a lifespan management method in which data is read and written using a magnetic head and lifespan management data is stored in the rotor.
It was proposed in No. 19371.

This lifespan management method will be explained below with reference to FIGS. 2 and 3.

A cylindrical sleeve 1o is attached to the upper end of a hub 4 rotated by a drive means 5 including a motor and the like, and is attached to the bottom of a rotor 1 that rotates at high speed.A magnetic thin film 11 is formed on the outer peripheral surface of a cylindrical sleeve 1o that is attached to the bottom of a rotor 1 that rotates at high speed. A coating material 12 is provided to protect the surface. The magnetic head 8, which is placed opposite to the magnetic thin film 111], reads the life management data on the magnetic thin film 11 and writes new life management data on the magnetic thin film 11. The magnetic head 8 is mounted on a base 6 installed on the bottom plate of the rotor chamber.

Therefore, at the start of operation, the life management data on the magnetic thin film] and 1 are read, and the life management data for the current operation is added to the life management data read at the end of operation to create new life management data for the magnetic thin film. 11, and the lifespan of the rotor 1 can be managed using the lifespan management data.

However, the above configuration has the following problems. The contact portion between the rotor 1 and the hub 4 is tapered, and the taper differs slightly depending on each centrifugal separator. Therefore, when the rotor is used in multiple centrifuges, the relative position between the magnetic head 8 and the magnetic thin film 11 changes in the vertical direction depending on the centrifuge, and the position where data is recorded changes in the vertical direction. There is a risk that data will be recorded twice, and there is a risk that old data will be read when reading.

In other words, there is a problem in that the life of the rotor cannot be reliably managed.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to make it possible to reliably manage the life of a rotor for a centrifuge.

[Summary of the invention]

As described above, the present invention focuses on the fact that the facing position of the recording head and the storage element changes in the vertical direction depending on the centrifuge used, and is characterized in that the width of the storage element is made narrower than the width of the recording head. It is something to do.

[Embodiments of the invention]

The present invention will be explained below with reference to FIG. 1 showing an embodiment. The width of the magnetic thin film 21, that is, the length in the vertical direction, is narrower than the track width of the magnetic head 8, and its surface is protected by a coating material 22. Since the change in the relative position of the magnetic thin film 21 and the magnetic head 8 along the vertical direction due to the difference in the taper of the hub 4 is about 1 mm, when the track width of the magnetic head 8 is 3 mm, the width of the magnetic thin film 21 is set to 2 mm or less. And it is sufficient.

As a result, even if the relative position between the magnetic thin film 21 and the magnetic head 8 changes, double recording of life management data can be prevented, and the magnetic thin film 21 can always accurately store the latest life management data. becomes possible.

In the above embodiment, the number of operations and cumulative operating time were explained as life management data, but the data is not limited to this. For example, as shown in the application dated the same date, the coefficient corresponding to the maximum rotation speed during operation is The value multiplied by the number of operations may be used as the number of operations. Also, although a magnetic thin film and a magnetic head were used as the storage element and the recording head, respectively, any type of device that can read and write without contact, such as an optical type, may be used. .

〔Effect of the invention〕

As described above, according to the present invention, life management data can be accurately recorded in the memory element even if the relative vertical position of the memory element and the recording head changes. However, accurate life management data can be recorded and reliable life management can be performed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing one embodiment of the device of the present invention;
The figure is a sectional view showing essential parts of a centrifugal separator to which the device of the present invention is employed, and FIG. 3 is a sectional view showing an example of a conventional system. In the figure, 1 is a rotor, 2 is a centrifugal tube, 4 is a hub, 5 is a driving means, 6 is a base, 8 is a magnetic head, 1o is a sleeve, 11 is a magnetic thin film, and 12 is a coating material. Name of patent applicant Hitachi Koki Co., Ltd. Engraving of drawings (no change in content) Mei 2 Zugyo 3 drawings

Claims (1)

[Claims] a memory element provided in a rotor that rotates at high speed to centrifuge a sample to be separated and stores rotor life management data;
A lifespan management device for a centrifugal separator rotor, comprising a recording head provided at a position facing the memory element, for reading data on the memory element and writing new data on the memory element, the apparatus comprising: A lifespan management device for a centrifuge rotor, characterized in that the width of the recording head is narrower than the width of the recording head.