JPH0545943Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a dynamic balance testing machine, and in particular, the shape of the roller that supports the specimen is improved.

B. Prior Art A horizontal dynamic balance tester for measuring rotor unbalance is known. In this test machine, Fig. 2,
As shown in FIG. 3, the journals 4 at both ends of the rotor 3 are placed on rollers 2a and 2b which are pivotally supported by the holder 1, and the rotor 3 is rotated in the direction of the arrow by a belt (not shown) or the like. If there is an imbalance, centrifugal force acts on the rotor 3. Now, if the rollers 2a, 2b or the holder 1 are held via a piezoelectric body, for example, the piezoelectric body is pressed by centrifugal force and outputs a voltage, thereby measuring the unbalance. Rollers 2a, 2
It is also known to measure unbalance by holding b with a movable holder and detecting the amount of movement of the movable holder due to centrifugal force using a differential transformer or the like. In addition, the third
In the figure, 5 is a shaft that supports the rollers 2a and 2b, and 6 is a bearing for the rollers.

C. Problems to be solved by the invention Conventional rollers 2a and 2b, for example, have a width of 200 mm, a flat part of 180 mm, and a radius of 10 mm at the corner. .

Therefore, during the test, both ends of the journal 4 are supported while protruding from the rollers 2a and 2b, so that the contact portion 4 with the journal surface, especially the roller corner
a, 4b are easily scratched, and the surface roughness after the test is, for example, as shown in Fig. 4b.
It became very rough and the peak value emax was about 0.1 mm.

An object of the present invention is to provide a dynamic balance tester in which the shape of the roller is determined so that the contact portion with the roller corner portion in the rotary journal is less likely to be damaged.

D Means for Solving Problems The present invention is a dynamic balance tester that measures unbalance by rotating a rotor supported by a rotor journal on a pair of rollers arranged in parallel. A flat part is formed at the center in the journal support direction, and a curved part that curves by drawing a convex curve that touches the flat part is formed at both ends of this flat part in the journal support direction, and the radius of curvature of these curved parts is This is set larger than the width of the curved portion in the journal support direction.

E Effect The flat part of the roller and the rotary journal are in line contact, and the contact pressure between them is kept low, thereby preventing deterioration of the surface roughness of the rotary journal. Moreover, curved parts that draw convex curves that touch the flat part are formed at both ends of the flat part, and the radius of curvature of these curved parts is set larger than the width of the curved part, so that the roller at both ends of the flat part An increase in the contact pressure between the rotor journal and the rotor journal is also suppressed, and the surface roughness of the contact portion of the rotor journal surface with the roller corner portion does not deteriorate excessively.

F Embodiment Figure 1a is a diagram corresponding to the cross-sectional view taken along the line - in Figure 2.
Form a flat part FL with a width of 150 mm. The area from both ends of the flat part to the end face of the roller is formed into a curved line with a radius of curvature of 200 mm centered on a line 1 passing through the ends to form a curved part CU. The intersection of the curved portion CU and the end face of the roller has a predetermined radius of radius. Note that the roller 2b is also supported in the same manner, and the opposite side of the journal 4 is also supported by similar rollers 2a and 2b.

After measuring the roller unbalance using these rollers 2a and 2b, the surface roughness of the rotary journal 4 was measured, and as shown in Fig. 1b, the peak value emax was about 0.01 mm, which was lower than that of the conventional 1. Reduced to /10. Note that the width of the roller is not limited to 200 mm, and the range and radius of curvature of the flat portion FL and curved portion CU are also determined as appropriate depending on the embodiment.

G. Effect of the Invention Since the present invention is configured as described above, the rotor journal is less likely to be damaged during unbalance measurement, and no problems arise when the rotor is assembled into a product after testing.

[Brief explanation of the drawing]

Figure 1a is a sectional view taken along the - line in Figure 2, Figure 1b
is a diagram showing the surface roughness of the rotor journal, FIGS. 2 and 3 are diagrams showing the schematic structure of the rotor support part,
Figure 2 is a sectional view taken along the - line in Figure 3;
- line sectional view of the figure, Figure 4 a, b is Figure 1 a,
It is a figure corresponding to b. 1...Holding body, 2a, 2b...Roller, 3...
Rotor, 4...Journal, 4a, 4b...Contact part, FL...Flat part, CU...Curved part.

Claims (1)

[Scope of utility model registration request] In a dynamic balance testing machine that measures unbalance by rotating a rotor supported by a rotor journal on a pair of rollers arranged in parallel, the roller has a flat part formed in the center in the journal support direction, and A curved portion that curves by drawing a convex curve that touches the flat portion is formed at both ends of the flat portion in the journal support direction, and the radius of curvature of these curved portions is made larger than the width of the curved portion in the journal support direction. A dynamic balance testing machine characterized by the following settings.