JPH08108097A - Swing rotor for centrifugal separator - Google Patents

Abstract

PURPOSE: To prevent the sticking of a pin to a pin insertion hole and to smoothly oscillate a bucket at all times by boring the pin insertion hole to be engaged with the bucket in the tip of the arm in a rotor body, allowing a small hole to pierce the insertion hole and injecting lubricating oil, etc. CONSTITUTION: A bucket 4 contg. a centrifuging tube, etc., holding a sample to be separated is fixed oscillatably to the arm extending radially from a rotor body with a pin 3. In this case, a pin insertion hole 7 to be engaged with the bucket 4 is bored in the tip of the arm, a small hole 8 is allowed to pierce the hole 7 from the upper face 5 of the arm, and lubricating oil, etc., are injected. As a result, the pin 3 is not stuck to the hole 7, and the bucket 4 is smoothly oscillated. Further, an annular groove 9 is formed at a part of the shaft to be inserted into the arm of the pin 3 and positioned to align with the small hole 8. Consequently, the lubricating oil, etc., are stored in the groove 9, and the injection cycle of the lubricating oil, etc., is prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing rotor for a centrifuge used in fields such as medicine, chemistry, and pharmacy.

[0002]

BACKGROUND OF THE INVENTION The subject matter of the present invention relates to a relatively low speed swing rotor used for separating blood during a blood test, for example, in the field of clinical medicine. This type of swing rotor is disclosed, for example, in Japanese Patent Laid-Open No. 49-15066.
Japanese Utility Model Publication No. 63-2110, Japanese Utility Model Publication No. 63-35797
No., published in Japanese Unexamined Patent Publication No. This conventional example can be explained with reference to FIG. 1 shown as an embodiment. In the figure, a rotor body 1 has a through hole at the center for fitting with a drive shaft, arms 2 are installed radially from the center, and pins 3 are attached near the tip of the arm. The bucket 4 is located between the opposing arms 2 and is swingably attached by a pin 3. A test tube filled with a sample to be centrifuged is inserted into the bucket. The pin 3 is inserted into a pin insertion hole provided in the vicinity of the tip of the arm portion to prevent the pin from coming off, and is rotatable in the circumferential direction.

[0003]

In the swing rotor constructed as described above, the phenomenon in which the faces are fixed to each other by the centrifugal force applied to the pin and the bucket by the pin insertion holes of the pin and the rotor body during repeated use is described. Occurs,
When the bucket swings, the pins do not rotate, causing the bucket to swing poorly, causing the buckets located at symmetrical positions to have unbalanced swing states, resulting in unbalanced operation and increased rotational vibration. At the time of stop, there was a problem that the bucket stopped while tilting and the sample spilled. When such a problem occurs, it is usually necessary to remove the pin, clean it, apply lubricating oil or the like, and then reassemble it.

An object of the present invention is to solve the above-mentioned problems of the swing rotor for a centrifuge and to make the swinging motion of the bucket always smooth.

[0005]

In order to achieve the above object, in a swing rotor for a centrifuge of the present invention, a small hole is formed in a pin insertion hole portion of a rotor body from an upper surface of an arm portion of the rotor body toward the pin insertion hole. Penetrated. Then, by injecting a lubricating oil or grease that serves as a lubricant for the pin and the pin insertion hole from the small hole, a lubricating film can be formed between the pin and the pin insertion hole, and the pin and the pin insertion hole are prevented from sticking to each other. be able to.

[0006]

In the swing rotor constructed as described above, a small hole penetrating the pin insertion hole is formed in the arm portion of the rotor body, and the lubricant is injected, so that the rotation operation of the pin becomes smooth and the bucket swings. The operation can be smooth.

[0007]

1 is an external view showing a swing rotor of the present invention. Further, FIG. 2 shows an external view of a general bucket that accommodates and swings a sample used for a swing rotor.
1 and 2, the bucket 4 has a suspending portion 6 formed integrally with the box body 4a, and this portion has a pin 3
And can be rocked. A small hole 8 is provided in the arm portion 2 and serves as a lubricant injection passage.

FIGS. 3 and 4 are vertical sectional views of the vicinity of the pin insertion hole portion of the embodiment of the present invention, showing the structure of the small hole 8. 3 shows that from the arm upper surface portion 5 to the pin insertion hole 7,
A small hole 8 is provided. In FIG. 4, an annular groove 9 is provided in the pin 3 at a position corresponding to the small hole 8. 5 to 7 are sectional views taken along the line AA of FIG. 3, and in FIG. 5, a small hole 8 is provided vertically toward the center of the pin insertion hole 7. In FIG. 6, a small hole 8 is provided vertically so as to be offset from the center of the pin insertion hole 7 on the rotary shaft side of the rotor. In FIG. 7, the angle of the small hole 8 is inclined with respect to the pin insertion hole 7, and the small hole 8 of the arm upper surface portion 5 is shown.
Is closer to the rotary shaft side of the rotor than the position of the pin insertion hole 7.

[0009]

According to the present invention, the pin and the pin insertion hole are prevented from sticking to each other and the bucket can be swung smoothly. Further, by providing the annular groove in the shaft portion of the pin, it is effective in storing the lubricant, and the lubricant injection cycle can be lengthened.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment of a swing rotor according to the present invention.

FIG. 2 is an external view showing a bucket used in the swing rotor according to the present invention.

FIG. 3 is a vertical sectional side view showing a pin insertion hole portion according to the present invention.

FIG. 4 is a vertical side view showing another embodiment of the pin insertion hole portion according to the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

1 is a rotor body, 2 is an arm part, 3 is a pin, 4 is a bucket, 4a is a box body, 5 is an arm upper surface part, 6 is a hanging part of the bucket, 7 is a pin insertion hole, 8 is a small hole 9 is a pin ring Grooves 10 are pin stoppers.

Claims (2)

[Claims] 1. An arm portion radially extending outward from a central portion having a fastening means for connecting to a drive shaft, a rotor body having a pin for swingably attaching a bucket to the arm portion, and an engagement member for the pin. In a swing rotor for a centrifuge, comprising: a bucket for accommodating a sample to be separated and a centrifuge tube or a rack for centrifuge tubes, the pin for engaging the bucket with the tip of the arm portion of the rotor body. A swing rotor for a centrifuge having an insertion hole, wherein a small hole is made to penetrate from the upper surface of the arm portion into the pin insertion hole so that lubricating oil or grease can be injected. 2. An annular groove is provided in a part of a shaft portion inserted into the arm portion of the pin engaging with the bucket, and the annular groove is positioned so as to coincide with the small hole. The swing rotor for a centrifugal separator according to claim 1.