JPH0515079Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a rotating disk for particle size distribution measurement (hereinafter referred to as disk) used in centrifugal particle size distribution measurement.
Regarding the improvement of

[Conventional technology]

As is well known, in centrifugal particle size distribution measurement, a cell containing a fixed amount of sample is set in a cell holder formed on a disk, and the disk is held horizontally and rotated by a motor. The particle size distribution in the sample is obtained by irradiating the cell with light from a light source and measuring the amount of transmitted light at that time with a detector.

FIG. 4 shows the main parts of a conventional disk 40,
The cell holder 41 is opened upward, and is formed so that a cell 42 containing a fixed amount of sample can be set inside the cell holder. Reference numeral 43 denotes a cell presser provided on the surface 44 of the disk 40, and the screw 4
5, 46 to be tightened.

[Problem that the invention attempts to solve]

However, in the disk 40 having the above configuration, it is rotated at high speed (for example,
10,000 times/min), there was a drawback that a large amount of noise (approximately 85 phon) was generated because the opening area of the cell holder 41 was quite large and the cell presser 43 protruded from the surface of the disk 40.

On the other hand, as shown in FIG. 5, a large-area cell holder 51 is provided on the surface 53 of the disk 50 so as to be able to rotate around a pivot 52, and the rotating end 55 is screwed during measurement. 54 or the like may be considered.

However, in this case, due to insufficient locking, such as forgetting to tighten the screw 54, the rotating end side 55 of the cell presser 51 protrudes from the peripheral end of the disk 50 due to centrifugal force while the disk 50 is rotating. There is a risk that the device will collide with an object and be damaged, causing the fragments to fly out and injure people or make it impossible to continue measurements.

The present invention was developed with the above-mentioned considerations in mind, and its purpose is to reduce as much as possible the noise generated when the disk rotates at high speed, and to provide a disk that can perform measurements safely. Our goal is to provide the following.

[Means for solving problems]

In order to achieve the above-mentioned object, the disk according to the present invention has a cover body that covers the upper part of the opening of the cell holder so as not to protrude from the surface of the disk, and moreover, to be able to freely slide in the radial direction of the disk and close to the circumferential edge. The opening is covered by sliding in the direction.

[Effect]

According to the above configuration, the cover body covers the top surface of the cell holder, and the area of the open portion is reduced, and the surface of the disk is free from uneven parts, so noise accompanying high-speed rotation of the disk is reduced. Ru. Further, since the cover body does not protrude outward from the peripheral edge of the disk, it does not come into contact with other objects.

The cover body is provided so as to be able to freely slide in the radial direction of the disk and to cover the opening by sliding in the circumferential direction, so that the disk can be rotated without forgetting to cover the opening with the cover body. Even if the disc rotates, the centrifugal force causes the cover to slide toward the circumferential edge, so that the opening is automatically covered by the cover, and the opening is always kept in the safe direction. act.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In Fig. 1, 1 is a cell 2 with good light transmittance.
This disk is made of aluminum, for example, and is attached to the rotating shaft 4 of the motor 3. Reference numeral 5 denotes a cell holder provided near the peripheral edge of the disk 1.

As shown in FIGS. 2 and 3, the cell holder 5 is mounted in the radial direction R of the disk 1 (in the figure,
V is formed along the peripheral side U and the center side V, respectively, so that the cells 2 can be accommodated therein. That is, the bottom portion 6 formed substantially horizontally
is provided with a stepped portion 7 formed one step lower on the center side V,
An opening 8 is formed in the upper part for taking the cell 2 in and out.

9 and 10 are cell holding parts formed along the radial direction R within the cell holder 5, and the cell 2 is
This prevents rattling in the direction (direction perpendicular to the radial direction R), and its top surface is
It is slightly lower than the surface 11 of , and has a smooth finish.

A cover body 12 is provided above the opening 8 and has a U-shape in plan view, and is arranged so as to be able to slide in the radial direction R on the upper surfaces of the cell holding parts 9 and 10. The opposite sides 13 and 14 of this cover body 12 have elongated holes 1 along the radial direction R, respectively.
5 and 16 are formed. Note that the side portion 13,1
It goes without saying that the interval 1 between the cells 2 and 4 is set so that there is no problem in inserting and removing the cells 2 into and from the cell holder 5.

Reference numerals 17 and 18 are guide members installed upright on the upper surfaces of the cell holding parts 9 and 10, and guide members 17 and 18 are installed in the upper surfaces of the cell holding parts 9 and 10, and are connected to the elongated holes 1 of the cover body 12.
Therefore, the cover body 12 can slide in the radial direction R within the range allowed by the elongated holes 15 and 16.

19 is the upper part of the cell holder 5, and is a cell presser provided on the peripheral end side U of the disk 1, so that the surface thereof does not protrude from the surface 11 of the disk 1.
It is fixed by fixing members 20 and 21. 22,
23 is a hole for transmitting light.

Next, the operation of the disk 1 having the above configuration will be explained.

Now, as shown in FIG. 3, when the cover body 12 is on the peripheral side U, slide it toward the center side V to open the opening 8 to the maximum, and place the cell 2 in a predetermined position inside the cell holder 1. position, and slide the cover body 12 toward the peripheral end side U (see Fig. 2).
The cover body 12 reduces the area of the open portion of the opening 8. Then, since there is no protruding part on the surface 11 of the disk 1,
Even if the disk 1 is rotated at high speed in the above state, the noise accompanying this rotation is significantly reduced. According to actual measurements by the inventors, it was possible to reduce noise by about 85 to 75% compared to the conventional configuration shown in FIG.

Furthermore, the range within which the cover body 12 can slide is restricted by the long holes 15, 16, and the cover body 12 will not protrude beyond the peripheral edge of the disk 1 while the disk 1 is rotating, and will not come into contact with other objects.

Since the cover body 12 is provided so as to be able to freely slide in the radial direction of the disk 1 and to cover the opening 8 by sliding in the circumferential direction, it is not necessary to cover the opening 8 with the cover body 12. Even when the disk 1 is rotated, the cover body 12 slides in the circumferential direction due to the centrifugal force caused by the rotation of the disk 1, so that the opening 1 is automatically covered by the cover body 12. Ru.

[Effect of idea]

As explained above, in the present invention, the cover body covering the upper part of the opening of the cell holder does not protrude from the surface of the disk, and can slide freely in the radial direction of the disk and in the circumferential direction. Since the opening is covered by the cover body, the cover body covers the top surface of the cell holder, and the area of the open part becomes smaller, and the surface of the disk is free from uneven parts, so that the disk The noise associated with high speed rotation is reduced. Furthermore, since the cover body does not protrude outward from the peripheral edge of the disk, it does not come into contact with other objects, resulting in safety.

Even if you forget to slide the cover body toward the circumferential edge of the disk after setting the cells in the cell holder and then rotate the disk, the cover body will be moved by the centrifugal force caused by the rotation of the disk. It slides in the circumferential direction, whereby the opening is automatically covered by the cover body. In other words, the disk according to the present invention has an excellent effect of always operating in a safe direction.

Further, the sliding operation of the cover body can be performed with one touch, and there is a practical effect that it can be handled extremely easily.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a disk according to the present invention, FIG. 2 is a sectional view showing the main parts of the disk, FIG. 3 is a perspective view showing the main parts of the disk, and FIGS. 4 and 5 are FIG. 2 is a perspective view for explaining a conventional technique. DESCRIPTION OF SYMBOLS 1...Disk, 2...Cell, 5...Cell holder, 8...Opening, 11...Surface of disk, 1
2...Cover body, R...Radial direction.

Claims (1)

[Scope of utility model registration request] In a rotating disk for measuring particle size distribution in which cells are housed inside a cell holder that opens upward, a cover body that covers the upper part of the opening of the cell holder is arranged so that it does not protrude from the surface of the disk. 1. A rotating disk for measuring particle size distribution, characterized in that it is provided so as to be slidable in a radial direction and so that the opening is covered by sliding in a circumferential direction.