JPH0659421B2 - How to operate the centrifuge - Google Patents

Description

The present invention relates to a method for operating a centrifuge.

[Prior Art] As a method of operating a centrifuge, a product (w ² t value) of square of angular acceleration and time is set, and this w ² t value is automatically operated based on a set rotation speed. There is a method of calculating the time and performing the w ² t value priority operation according to the calculated value. 3 and 4 show two examples of the prior art.

[Problems to be solved by the invention]

Therefore, in the operation method of the centrifuge shown in FIG. 3, the period from the start of acceleration to the shift to deceleration is considered as a rectangle, and the w ² t value that should be obtained during that time is set as the set w ² t value to calculate the operation time. That is.

The operation method of the centrifuge shown in FIG. 4 is to continue the operation until the w ² t value obtained during actual operation reaches the set w ² t value.

In the former case, that is, in FIG. 3, the w ² t value obtained during actual operation is shown by the slanted line in FIG. 6 (b), and the w ² t value in the portion a is insufficient, so deceleration Although the w ² t value of the mouth portion obtained during the operation is added, it is undeniable that a shortage occurs when the entire driving system is viewed.

Further, in the latter case, that is, in the case of FIG. 4, a method is adopted in which the speed becomes equal to the set w ² t value and then the deceleration is started. According to this method, the w ² t value of the portion C obtained during deceleration is excessive. There was a pity.

The present invention has been made as a result of studies to solve the above-mentioned problems of the prior art, and its object is to determine the difference between the set w ² t value and the w ² t value during actual operation. Therefore, it is an object of the present invention to provide an improved centrifuge operation method capable of performing accurate w ² t value priority operation without excess or deficiency and further improving the sample analysis accuracy as compared with the conventional method. .

[Means for solving problems]

The purpose is to mount rotating bodies having different allowable rotational speeds on a drive motor, set a w ² t value, and automatically calculate an operating time from this value and the set rotational speed. Therefore, in the operation method of the centrifuge in which the w ² t value priority operation is performed, the operation time is recalculated from the w ² t value up to that point at the end of acceleration, and this calculated value is used to calculate before acceleration starts. Automatically change the running time and set w ²
This is achieved by eliminating the difference between the t value and the w ² t value during actual operation and performing the w ² t value priority operation.

[Action]

Therefore, according to the present invention, in the w ² t value priority operation of the centrifuge, the operation time is recalculated from the w ² t value up to that point at the end of acceleration, and the operation time calculated before the start of acceleration is calculated. Automatically changed to set w ² t value and w ² t during actual operation
It is possible to perform accurate w ² t value priority operation by eliminating the difference from the value.

〔Example〕

The present invention will be described below with reference to one embodiment of FIGS. 1 and 2. FIG. 1 is a diagram showing a method of calculating an operating time when the w ² t value priority operation is performed by the method of the present invention. The figure is a block diagram of an operating time calculating circuit used in the method of the present invention. Here, the method of calculating the operating time shown in FIG. 1 will be described below. That is, the operation time calculated in FIG. 1 is calculated back from the following equation at the set time point before the start of operation.

t: operating time w: angular velocity during settling However, W = 2πN / 60.

N: Rotational speed (rpm) Then, when the actual operation is started, the acceleration time measurement unit 5 in FIG. 1 starts measuring the acceleration time, and the w ² t value setting display unit 2 displays The resulting integrated w ² t value is displayed. At the time of shifting from the acceleration to the settling operation, the microcomputer 1 calculates the following equation based on the acceleration time sent from the acceleration time measuring unit 5 and the integrated w ² t value of the w ² t value setting display unit 2. Ie The operating time is calculated from the formula. Since the centrifugal separator, and the acceleration characteristics and deceleration characteristics can be controlled to be the same, two parts of Figure 1 are obtained during acceleration w ²
Although it has the same area as the t value, it can be considered to have the same value as the w ² t value obtained during deceleration. And the above (2)
The difference between the calculated operation time and is calculated before starting operation operating time by the formula is obtained setting w ^{2 t} value and the operating time w ² t
Since it is a necessary increase in the operating time (corresponding to T in FIG. 1) for eliminating the difference with the value (that is, the portion of E in FIG. 1), the microcomputer 1 is the a and performs operation automatically changed, this eliminates the difference between w ^{2 t} value during the actual operation settings w ^{2 t} value, is possible to perform accurate w ^{2 t} value priority operating it can.

〔The invention's effect〕

The present invention is as described above, and as is apparent from the illustrated embodiment, according to the present invention, when the w ² t value priority operation of the centrifuge is performed, the operation time is changed from the w ² t value up to that point at the end of acceleration. recalculated and the operation time calculated before the start acceleration is automatically changed, set w ² eliminates the difference between w ^{2 t} value at ^t value and the time of actual operation, just enough accurate w ² t Value-priority operation can be performed, and thus the analysis accuracy of the sample can be improved more than before.

[Brief description of drawings]

1 and 2 show one embodiment of the method for operating a centrifuge according to the present invention, and FIG. 1 shows w ² t according to the method of the present invention.
Value (product of square of angular acceleration and time) showing a driving time calculation method in the case of preferential driving, FIG. 2 is a block diagram of a driving time calculation circuit used in the method of the present invention, FIG. 3 and FIG. FIG. 4 is a diagram showing a method of calculating an operating time in the case where the w ² t value priority operation is performed by the conventional method. 1 is a microcomputer, 2 is a w ² t value setting display section,
3 is a rotation speed setting display unit, 4 is an operating time display unit, and 5 is an acceleration time measuring unit.

Claims (1)

[Claims] 1. A rotating body having a different allowable rotational speed is mounted on a drive motor, and a product of a square of angular acceleration and time (w ² t).
Value), the operating time is automatically calculated from this value and the set rotation speed, and in the operating method of the centrifuge in which the w ² t value priority operation is performed according to this calculated value, that at the end of acceleration. until recalculates the driving time from w ^{2 t} value, the re-calculated value calculated operation time before the start acceleration according to automatically change the setting w ^{2 t} value and w ^{2 t} value during actual operation A method for operating a centrifuge, which comprises performing a w ² t value priority operation with no difference.