JPS626132A - Balancing machine - Google Patents

Abstract

PURPOSE:To compensate the unbalance with the passage of time of a main shaft of rotation automatically by rotating the main shaft of rotation with a prescribed period in a state that a test piece is not fixed and calculating an unbalance signal and adding this signal to the unbalance signal with antiphase at the time of testing. CONSTITUTION:When the normal measuring operation in which the main shaft 1 of rotation rotates with fixing the test piece attains the prescribed number of times, a cycle counter 11 gives a command to a handling device and rotates the main shaft 1 without fixing the test piece. Hereby, the unbalance of the main shaft 1 is detected by a pickup 3 and stored in a storage circuit 12. At the time of the subsequent measuring operation, an signal of the storage circuit 12 is made to the antiphase by an inverter circuit 13 and added to the unbalance signal with an operational amplifier 4. Accordingly, even if the unbalance of the main shaft 1 of rotation is changed with the passage of time, since the contents of the storage circuit 12 is renewed every prescribed number of time, the change can be compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a balance tester, and more particularly to a balance tester of a type in which a specimen is fixed to one end of a rotating main shaft and rotated.

<Prior art> In the balance testing machine as described above, the specimen is fixed to the end of the rotating main shaft via an adapter, and the unbalance signal generated by rotating the rotating main shaft in this state is used to detect the unbalance signal of the specimen. The balance vector is found. Therefore, it is necessary to compensate for unbalance on the rotating main shaft side and eccentricity between the center of the specimen and the rotation center of the rotating main shaft.

Conventionally, to explain the principle of this type of compensation, prior to the test, the specimen is attached to the rotating main shaft via an adapter and rotated, and the unbalance due to eccentricity mentioned above is measured. The balance vector is determined, and then the mounting direction of the specimen is rotated 180 times, and the unbalance vector is similarly determined.

When the two types of unbalance vectors obtained are added, the true unbalance vector existing in the specimen is canceled, and the remaining vector C is the unbalance due to eccentricity of the specimen and the rotating main shaft side. It is twice the sum of the unbalance vectors existing in . Therefore, this -1
The true unbalance vector of the specimen can be obtained by determining the electric signal corresponding to the vector of /2C and then adding it to the measured unbalance vector.

<Problems to be solved by the invention> According to the conventional compensation method, the eccentricity of the specimen due to processing errors of the adapter, etc. and the unbalance of the rotating main shaft side including the adapter are compensated at the same time. If there is no moving part on the rotating main shaft side, the above-mentioned compensation signal will be effective for a long time, but in an automated balance tester, an automatic titration mechanism for the specimen is adopted on the main shaft side. There are moving parts. Therefore, the unbalance on the rotating main shaft side changes over time, albeit slightly. In order to compensate for this variation, it is necessary to obtain the vector C mentioned above at a predetermined period, but this work involves a lot of manual work, such as changing the direction of the specimen by 180 degrees. However, this is not possible during automatic operation, and there is a problem in that efficiency is significantly reduced.

An object of the present invention is to provide a balance tester that can automatically monitor the change over time in the unbalance on the rotating main shaft side and reflect it in compensation.

<Means for solving the problem> The feature of the present invention is that the rotating spindle is rotated at a predetermined period without a specimen attached, and the unbalance signal present at the rotating spindle is detected from the unbalance signal at that time. Obtain two types of DC signals corresponding to the x and y components of the unbalance vector, store the obtained results in a memory circuit, and use the stored contents to determine when the rotating spindle is rotated without fixing the specimen. An alternating current signal corresponding to a signal with the opposite phase of the unbalance signal generated at It's because it's configured.

<Function> If the rotating main shaft is rotated without fixing the specimen, an unbalance signal will be generated due to the unbalance of the rotating main shaft. When a signal with the opposite phase of this unbalance signal is added to the unbalance signal generated during normal measurement rotation with the specimen fixed, the unbalance vector of the rotational main shaft is canceled. By automatically obtaining and updating the unbalance signal caused by the unbalance of the rotating main shaft at a predetermined period, it becomes possible to compensate for changes in the unbalance of the rotating main shaft over time.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

The rotating main shaft 1 is rotationally driven by a motor 2.

The unbalance signal U generated during the rotation of the zero-rotation main shaft 1 to which the specimen is fixed via the adapter la is detected by the pickup 3, and is detected by the operational amplifier 4.
．． 5 to a synchronous rectifier 6. The rotation reference phase signal J of the rotation main shaft 1 is obtained by detecting a reference protrusion etc. provided on the rotation main shaft 1 with the proximity switch 7,
This reference phase signal J is guided to a phase circuit 8. The phase circuit 8 uses this reference phase signal J as a carrier.
0°, 90°, 180' and 270° relative to signal J
It is configured to output square wave signals having a phase difference of 180 degrees and a switching ratio of 180 degrees.

In the synchronous rectifier 6, the unbalance signal U that has passed through the operational amplifier 4.5 is chopped and smoothed with the 0° and 90° square wave signals from the phase circuit 8.
Obtain DC signals x and y corresponding to the unbalance vector, x component, and y component. This DC signal is sent to the display,
Is displayed. The above is the well-known unbalance measurement method of the so-called synchronous rectification method. The rotation of the motor 2 is automatically controlled by a motor drive circuit 9, and the specimen is attached to and detached from the adapter 1a by a handling device (not shown). Gets chucked. This results in fully automatic unbalance measurement.

The output signal from the eccentricity compensation signal generator 810 is introduced into the operational term intermediater 5, and this output signal is added to the unbalance signal here. This eccentricity compensation signal generator 10 is a DC voltage generator 10 that generates two types of DC signals.
a, and an inverter circuit 10b that chops and adds the output of the DC voltage generator 10 with 0° and 90° square wave signals from the phase circuit 8, respectively.
This is a compensation circuit based on the conventional compensation method described above. That is, the output of the eccentricity compensation signal generator 10 is an electric signal corresponding to the 11/2C vector described above, and the magnitude of the output of the DC voltage generator 10a is artificially reduced by the procedure described above. decide. However, in the embodiment of the present invention, the electric signal corresponding to the 1 1/2 C vector obtained in the same way as in the conventional case includes only the component of the unbalance vector based on the eccentricity of the specimen, as will be described later. Therefore, the component of the unbalance vector of the rotational main shaft 1 is not included.

Now, in the embodiment of the present invention, the following circuit is added in order to compensate for the imbalance of the rotating main shaft l. That is, the cycle counter 11 counts the number of operations of the rotating spindle 1 by the motor drive circuit 9 and generates an output when the number of operations reaches a preset number.
a storage circuit 12 that stores the input signal by the output of 1;
An inverter circuit 13 that chops the output of the memory circuit 12 and converts it into an alternating current signal, and an eccentricity compensation signal generator 1
An operand intermediate unit 4 and a cycle counter 1 are provided before the operational term intermediate unit 5 which adds the output of 0, and are used to add the output of the above-mentioned inverter circuit 13 to the unbalance signal U.
An unbalance amount determining circuit 14 is provided which is driven by the output of the synchronous rectifier 6 and compares the magnitude of the output of the synchronous rectifier 6 with a preset value.

The cycle counter 11 is mounted on the rotating main shaft 1 by fixing the specimen.
2. When the number of normal measurement operations reaches a predetermined number, a command is given to the handling device to rotate the rotating main shaft l without fixing the specimen.

As a result, direct current signals x and y corresponding to the X and X components of the unbalance vector present in the rotating main shaft 1 including the adapter 1a are output from the synchronous rectifier 6, but these signals are output from the cycle counter 11. The data is stored in the memory circuit 12 by the 1 command.

Thereafter, normal measurement operation is resumed in which the specimen is fixed and the rotating main shaft 1 is rotated. At this time, the DC signal X stored in the memory circuit 12 is used.

y is converted into an AC signal A by the inverter circuit 13 as follows.
The signal A is added to the unbalance signal U in the operand divider 4.

FIG. 2 shows the process of obtaining the AC signal A in the inverter circuit 13. That is, the DC signals X and y from the memory circuit 12 are chopped with the 180° and 270' left wave signals from the phase circuit 8, respectively, to obtain the signals X' and y'. Next, these are added to obtain AC signal A. Here, the DC signals X and y stored in the memory circuit 12 are processed by chopping the unbalance signal "" generated when the rotating main shaft 1 is rotated with the Oo and 90° square wave signals. , the X component and the X component of the unbalance vector existing in the rotational main shaft 1, the AC signal A obtained as described above is equivalent to the opposite phase signal -U of the unbalance signal U.

Therefore, during normal measurement with the specimen fixed, the unbalance signal that has passed through the arithmetic term converter 4 is one in which the unbalance component present at the rotational main shaft I is removed.

Therefore, prior to measurement, first, as described above, the memory circuit 1
2 contains the X component of the unbalance of the main axis of rotation l.

The X component is stored, and then the eccentricity compensation signal generator l
When a compensation signal is obtained according to the conventional method using O, since the unbalance component of the rotating main shaft 1 has already been canceled at the stage before the arithmetic amplifier 11 5, the obtained compensation signal is a signal based on the processing error of the adapter 1a, etc. Only the unbalanced component corresponding to the amount of eccentricity of the specimen is left. The unbalance component corresponding to this amount of eccentricity hardly changes over time and is effective over a long period of time.

When the contents of the memory circuit 12 are automatically updated each time a predetermined number of measurements is reached by the output of the cycle counter 11, the unbalance of the rotating main shaft 1 due to the movable parts present in the rotating main shaft 1 can be checked over time. Compensation can be made in response to changes.

In addition, when measuring the X component and the
It is also possible to stop automatic operation and issue a warning.

In addition, in the above embodiment, an example was described in which the unbalance of the rotating main shaft 1 is measured only by the output of the cycle counter 11. However, for example, if the unbalance measurement results of the specimen repeatedly fail. It can also be configured to be performed in some cases.

Furthermore, although an example in which the present invention is applied to a vertical-plane balance tester has been described above, it goes without saying that the present invention can be similarly applied to a vertical two-plane dynamic balance tester.

Effects> As explained above, according to the present invention, the unbalance of the rotating main shaft 1 is automatically measured and stored at a predetermined period, and the opposite phase signal of the unbalance signal of the rotating main shaft 1 is determined from the stored contents. Since the configuration is configured to generate an AC signal corresponding to , and add it to the unbalance signal during normal measurement, the unbalance of the rotating main shaft 1 changes over time due to the presence of movable parts in the rotating main shaft 1. It is now possible to automatically follow this and compensate even if the accident occurs. This not only improves the reliability of unbalance measurement results obtained through fully automatic operation, but also eliminates the need to stop the automatic cycle and perform complicated work to update compensation values, significantly improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the process of obtaining an alternating current signal A using an inverter circuit 13. ■=・One-rotation main shaft 1a-・Adapter 2-Motor 3・-Zeck up 4.5・・Operation term intermediate unit 6-Synchronous rectifier 7-・Proximity switch 8
−・−・Phase circuit 9−・Motor drive circuit f〇−Eccentricity compensation signal generator

Claims (1)

[Claims] By synchronously rectifying the unbalance signal generated by fixing the specimen to one end of the rotating main shaft and applying rotation to it, based on the rotation reference phase signal of the rotating main shaft, the unbalance vector existing in the specimen can be rectified. In a device that obtains two types of DC signals corresponding to the x and y components and determines the magnitude and angle of unbalance of the specimen, the main rotating shaft is rotated at a predetermined period without the specimen being fixed. From the unbalance signal, two types of DC signals corresponding to the x and y components of the unbalance vector existing on the rotational main shaft are determined, and the contents of the storage circuit are updated and stored at the above-described predetermined period based on the determined results. From the memory contents, an AC signal corresponding to a signal with the opposite phase of the unbalance signal generated when the rotating main shaft is rotated without the specimen being fixed is generated, and from then on, the AC signal is used to fix the specimen. A balance testing machine characterized in that it is configured to be capable of compensating for an unbalance existing in the rotating main shaft by adding it to an unbalance signal generated when the rotating main shaft is rotated.