JPH06102130A - Dynamic balance tester - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the indexing accuracy of the work without restraining the torsional vibration of the work due to the unbalanced amount. [Structure] The dynamic balance tester includes a boat platform 30 that rotatably supports a work W, bases 22 and 23 that elastically support the boat platform 30, and a boat platform 30 that rotates the work W.
The vibration detectors 25 and 26 for detecting the vibration of the work W and the work drive mechanism 40 for driving the work W are provided.
A plurality of belts 44a and 44b are wound around and the plurality of belts 44a and 44b are brought into sliding contact with the work W to drive the work W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic balance tester for detecting an unbalanced amount of a work by rotating a work set on a so-called boat mount with a belt and measuring a vibration of the boat mount.

[0002]

2. Description of the Related Art FIG. 5 is a view showing a conventional example of a dynamic balance testing machine of this type. A pair of mounts 4 are suspended from each other by springs 3 on a base 2 fixed integrally with the base 1, and a work 6 is set on a bearing portion 5 provided on the mount 4. The base 1 is provided with three pulleys 7a to 7c,
A belt 8 is wound around these pulleys. 9
Is a pulley that rotates by receiving a rotational force from a motor (not shown), and the belt 10 is wound around the pulley 7a. When the pulley 7a is rotated by the belt 10, the belt 8 is also driven, and the work 6 is rotationally driven by the belt 8 slidingly contacting the lower peripheral surface of the work 6, as shown in FIG. When the work 6 has an unbalanced amount, the gantry 4 vibrates, and a vibration detector (not shown) measures the vibration of each gantry 4.

[0003]

When measuring the amount of unbalance with the dynamic balance tester, the unbalance position is also detected at the same time. The unbalanced position is detected as a rotation angle of the work with respect to the reference position. In order to efficiently perform the correction work after the measurement, it is indispensable to index the work after the measurement so that the unbalanced position is oriented in the vertical direction, for example. In this case, the rotation angle from the unbalanced position to the reference position is calculated, and the work indexed at the reference position in advance is rotated by that rotation angle to perform the indexing work.
In an automatic machine, the work that has completed such indexing work is transported by the transport arm to the unbalance correction device in the next stage.
The imbalance is corrected. On semi-automatic machines, markers will be used to mark unbalanced positions to aid in the next correction work.

However, as shown in FIG. 6, if there is only one belt 8 that is in sliding contact with the work 6, slip occurs between the work 6 and the belt 8 and the work is rotated even if the motor is rotated by the calculated rotation angle. 6 may not be correctly indexed to the reference position.

Therefore, as shown in FIG. 7, it is conceivable to slidably contact the work 6 with the two belts 8a and 8b.
However, depending on the imbalance of the work 6, the work may try to vibrate torsionally as shown by the arrow in FIG. 7, and when the two belts 8 a and 8 b are brought into sliding contact with the work 6, the two belt 8 a , 8b restrain such movement of the work 6, and the amount of imbalance cannot be measured correctly.

An object of the present invention is to provide a dynamic balance tester capable of improving the indexing accuracy of a work without restraining the torsional vibration of the work due to the unbalanced amount.

[0007]

A feature of the present invention is that there are two or more belts for imparting a rotational force to a work, a pair of mounts for supporting the work is configured as a boat mount, and those belts are wound around. It is to install the pulley on the boat stand.

[0008]

[Function] The rotating force is applied to the work by the plurality of belts. When torsional vibration occurs in the work, the boat-shaped mount also vibrates in the same manner, and the vibration detector detects the vibration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a plan view of a dynamic balance testing machine according to the present invention, and FIG. 1 is a boat-shaped stand seen from the line II in FIG. 2 and 3 provided therein.
FIG. 3 is a view showing two pulleys, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG.

A pair of bases 22 and 23 are installed on the base 21 at predetermined intervals, and a boat-shaped mount 30 is suspended on the pair of bases 22 and 23 by rod springs 24a to 24f. The boat-shaped mount 30 is elastically supported by the bases 22 and 23 by such rod springs 24a to 24f.

The boat-shaped mount 30 has a pair of opposed standing walls 32 and 33 each having a work bearing 31 provided on the upper portion thereof.
And L-shaped connecting fittings 34 and 35 attached to the lower portions of the pair of standing walls 32 and 33 with bolts B1, and bolts B2.
Connected to the connection fittings 34, 35 with the connection fittings 34, 35
It is configured with a bottom plate 36 that connects the two.

One bar spring 24a is provided on one side surface of the one standing wall 32, and two bar springs 24b, 2 are provided on the other side surface thereof.
4c are attached respectively, and these rod springs 24a to
A standing wall 32 is suspended from one of the bases 22 by 24c. One bar spring 24 is provided on one side surface of the other standing wall 33.
d, two bar springs 24e and 24f are attached to the other side surface, and the standing wall 33 is suspended from the other base 23 by these bar springs 24d to 24f. Reference numeral 60 is a plate for fixing the rod springs 24a to 24f to the standing walls 32 and 33 with bolts B6.

A pulley mounting plate 37 is mounted on the bottom plate 36 with bolts B3, and pulley mounting brackets 38, 39 are further mounted on the pulley mounting bracket 37 with bolts B4. A pulley 41 is rotatably supported by the pulley mounting member 37, and pulleys 42, 43 are rotatably supported by the pulley mounting members 38, 39, respectively. A belt 45 is wound around the pulley 41, and the pulley 4
Reference numeral 5 rotates by receiving a rotational force from a motor (not shown). Two belts 44a and 44b are wound around the pulleys 41 to 43, and the rotation of the pulley 45 drives the belts 44a and 44b. Here, a work drive mechanism composed of these pulleys 41 to 43 and belts 44a and 44b is designated by reference numeral 4.
It is indicated by 0.

2 and 4, reference numerals 25 and 26
Is a differential transformer type vibration detector, the housings of which are fixed to the bases 22 and 23, respectively. A movable mandrel (not shown) is connected to each of the pair of standing walls 32 and 33 that form the boat-shaped stand 30, and each movable mandrel has a vibration detector 2.
It is inserted in the inside of 5, 5 respectively so as to be able to move forward and backward.
Therefore, the vibration detector 25 is installed on the standing wall 32 of the boat-shaped stand 30.
The vibration detector 26 detects the vibration on the side of the standing wall 33 of the boat frame 30.

The bearing 31 includes a plate 31b inserted into the vertical walls 32 and 33 from above and fixed by a pressing plate 31a, and a V groove 31c fixed by a bolt B5 on the front surface of the plate 31b. Work W
Both ends of the shaft are rotatably supported. Reference numeral 51 in FIG. 3 indicates a jack bolt, which is used to adjust the height position of the bearing 31.

In the dynamic balance testing machine thus constructed,
The work W set on the bearing 31 is 2
The vibration detectors 25 and 26 detect the vibration of the work W generated when the belts 44a and 44b of the book are rotationally driven, and the unbalance amount is detected. At this time, at the same time, the unbalanced position of the work W with respect to the reference position is calculated, and after the measurement is completed, a motor (not shown) for the work drive mechanism is driven to rotate by an amount corresponding to the unbalanced position, whereby the unbalanced position Belts 44a, 44 so that the
The unbalanced position of the work W is determined by b.

Therefore, the two belts 44a and 44b
Since the rotational force is transmitted to the work W, there is no slip between the two and the unbalanced position can be accurately indexed after the measurement is completed. Further, even if the work W is rotationally driven by the two belts 44a and 44b, since the three pulleys 41 to 43 for driving the belt are installed on the boat-shaped platform 30, the work W is not measured at the time of unbalance measurement. When an attempt is made to make torsional vibrations as shown by arrows in FIG. 7, the torsional vibrations are transmitted to the boat-shaped mount 30 via the belts 44a and 44b and are reliably detected by the vibration detectors 25 and 26. That is, as in this embodiment, the work drive pulleys 41 to 43 are provided on the boat-shaped mount 30, and the boat-shaped mount 30 is attached to the rod spring 24a.
By suspending from the bases 22 and 23 at ~ 24f, 2
Even if the slip between the work W and the work W is suppressed by using the belts 44a and 44b of the book, any movement of the work W is not restricted.

The number of belts is not limited to two, and the belt winding method is not limited to the embodiment. Further, the form of the boat-shaped platform is not limited to that of the embodiment, and a system in which the boat-shaped platform is supported by an elastic support member other than a bar spring may be used, as long as it does not restrain the torsional vibration of the work.

[0019]

As described in detail above, according to the present invention, since there are two or more belts for imparting the rotational force to the work, the slip between the belt and the work is suppressed and the indexing accuracy is improved. In addition, the pulley around which those belts are wound is installed on the boat-shaped platform, so that when a work is twisted, the boat-shaped platform will follow the vibration without being restrained by the belt. Therefore, the measurement accuracy is secured without restraining the movement of the work.

[Brief description of drawings]

FIG. 1 is a view of FIG. 2 taken along the line I-I, showing a boat frame and three pulleys provided therein.

FIG. 2 is a plan view of a dynamic balance testing machine according to the present invention.

3 is a sectional view taken along line III-III of FIG.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a diagram showing a conventional work drive mechanism.

FIG. 6 is an explanatory diagram of a work drive mechanism that uses one belt.

FIG. 7 is an explanatory diagram of a work drive mechanism that uses two belts.

[Explanation of symbols]

 21 Base 22,23 Base 24a-24f Rod Spring 25,26 Vibration Detector 30 Boat Frame 31 Bearing 32,33 Standing Wall 36 Bottom Plate 37,38,39 Pulley Mounting Plate 40 Work Drive Mechanism 41-43 Pulleys 44a, 44b Belt W work

Claims (1)

[Claims] 1. A boat-shaped mount for rotatably supporting a work, a base for elastically supporting the boat-shaped mount, a vibration detector for detecting vibration of the boat-shaped mount due to rotation of the work, and a pulley. In a dynamic balance tester comprising a work drive mechanism that drives a work by sliding a belt onto the work, a plurality of belts are in sliding contact with the work, and the pulley that drives the plurality of belts is used. A dynamic balance tester mounted on the boat-shaped stand.