JPS58162827A - Balance measuring device of rotating body - Google Patents

Abstract

PURPOSE:To eliminate measurement errors, by interlocking and connecting a rotation detector to a rotating body by means of a separate pulley and belt thereby alowing the rotation detector to follow up the abrupt change in the rotation of the rotating body exactly. CONSTITUTION:A rotating body 1 is journaled and supported on the respective supporting rods 2', 3' of both rolling detectors 2, 3, and are made freely rollable in a specified range. A driving side belt 7 put turnably on driving side pulleys 5, 6 and the prime moving pulley 4' of a prime mover 4 is brought into press contact with the body 1 so that the body 1 is rotated at a high speed of the mover 4 in the stage of measurement. A detection side belt 10 put around a detection side pulley 9 and a driven pulley 8' are brought into press contact with the body 1, and a rotation detector 8 rotates cooperatively with the body 1. A control circuit 14 rotates and controls the mover 4 in accordance with the output signals of the detectors 2, 3 and the detector 8, and measures and detects the positions of the unbalanced sections of the body 1 from the number of the output pulses from the detector 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for measuring and detecting the weight balance of rotating bodies such as electric motor rotors, fan blades, flyholes, etc., mainly during the manufacturing process.
The purpose is to make measurements extremely accurate.

Conventionally, in measuring and detecting the weight balance of such a rotating body, the rotating body is rotated in a state in which it is pivoted so that it can freely sway, and the lateral shaking that occurs due to the imbalance of the weight of the rotating body during this rotation is measured. A commonly used method is to convert it into an electrical signal and compare this electrical number 1d with a rotation reference wave indicating the rotation of the rotating body to measure and detect the degree of imbalance in the rotating body. . However, in the above method, in order to obtain the rotating reference wave, the rotating body is marked and the mark is detected by a sensor installed near the rotating body, and the output signal from the sensor is used as the rotating reference wave. However,
For this reason, it is necessary to mark a large number of rotating bodies one by one during measurement, and to erase the marks after measurement, which is a very complicated and time-consuming process. The problem is that the city trams have to be adjusted accordingly.

Therefore, a stepping motor is used as the driving source for the rotating body, and the step pulse from this stepping motor is counted as the rolling detection signal of the rotating body as a start signal, so that the unbalanced part of the rotating body passes through the center of the rotating body. A device has been devised that measures and detects balance without markings or sensors by stopping the motor drive and making the rotating body stand still when the count reaches a point where it reaches the horizontal or vertical line. .

However, the above device also has the following drawbacks. In other words, the rotation of the stepping motor is transmitted to the rotating body via the pulley and belt, but when the motor is braked to decelerate or stop, the inertia of the rotating body causes the rotation to be transmitted to the rotating body. A slip occurs between the belt and the
A relatively large error occurs in the stopping angle of the rotating body, making it impossible to perform an accurate meeting.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and includes a rotation detector for a rotating body separate from the TIb source, and
This rotation detection gMt is operatively connected to the rotating body via separate pulleys and bells 1, thereby solving the drawbacks of the prior art.

Embodiments of the present invention will now be described in detail based on the drawings showing one embodiment.

In FIG. 1, 1 is a rotating body to be measured, 2 and 3 are a pair of rolling detectors for the rotating body 1, and ◆ is a prime mover consisting of a motor that is the driving source for the rotating body 1. The shaft 1' inserted and fixed in its longitudinal direction is connected to both side vibration detectors 2 and 3.
It is supported by the support rods 2' and 8' on a shaft and can swing freely within a certain range (swinging in the direction of arrow A in the figure). On the other hand, the drive side belt 7, which is arranged in parallel and is wound around the nine pairs of drive 111 @ pulleys 5゜6 and the driving pulley 4' of the main machine 4 in a forwarding state, is in pressure contact with the rotating body IK, and The rotating body 1 is rotated at high speed by the rL horizontal machine 4 during measurement.

During the above-mentioned high-speed rotation, if the rotating body 1 is properly lanced, it will not sway horizontally, but if the lance is not properly balanced, the rotating body 1 will sway depending on the amount and position of the unbalanced part. Both support rondo 2'.

3' reciprocates in the direction of arrow A. At such time, detectors 2 and 3
In this case, since a coil is attached to the lower part of the rods 2' and 8' and a magnet is placed opposite to this coil, the detector 2.11 detects #! As shown in Figure 2 (-), the motor 8 which generates an electric signal in the form of a sine wave in response to the horizontal vibration of the rotating body 1 is a rotation detector consisting of a rotary encoder that outputs a pulse at every fixed angle of rotation. C, rotating body 1
A detection-side pulley 9 and a passive pulley of the rotation detector 8 are arranged in parallel and close to the rotating body 1 at one position and opposite to the rotation detector 8 at the other side of the rotating body 1. The detection side bell 10, which is wound around the rotating body 8' in a forwarded state, is pressed against the rotating body 1, so that the rotation detector 8 rotates in conjunction with the rotating body 1.

11.12.13t; is filtered by an amplifier circuit, a tracking filter, and a waveform shaping circuit connected in series to both roll detectors 2 and 3, so that the output signals of the detectors 2 and 3 as shown in Figure 2 (-) are , by sequentially passing through these electric circuits N1, various mixed noises are removed after being amplified, and #I
As shown in FIG. 2(b), it is converted into a pulse signal synchronized with the zero point at the time of a small fall. Reference numeral 14 denotes a control circuit, which includes a counter that counts up the output pulse of the rotation detector 8 using the output pulse of the waveform shaping circuit 13 as a gate start, and a braking unit that controls the rotation of the prime mover 4 according to the count number of this counter. When measuring the weight balance of the rotating body 10 using the embodiment device configured as described above, both the rolling detectors 2 and 3 are moved downward from the position shown in the figure by a lifting device (not shown). Now, after the rotating body 1 is supported on the shaft by both the rolling detectors 2 and 3 in this lowered state,
This is raised and the rotating body 1 is pressed against both bells) 7 and 10.

Then, when the original machine number rotates and the roll detection signal as shown in Figure 2 (-) is output from the roll detector 2 or 3, based on this signal, the roll detection signal shown in Figure 2 (b) is output. A pulse signal is generated. To explain this signal, the horizontal vibration of the rotating body 1 is maximum when the unbalanced part is located on the horizontal line passing through the center of the rotating body 1. The horizontal movement of the shaking rotating body 1 stops instantaneously. Therefore, when the unbalanced part of the rotating body 1 is located on the horizontal line passing through the center of the rotating body 1, the output voltage of the rolling detector 2. Therefore, the pulse shown in FIG. 2 (6) is output when the unbalanced part of the rotating body 1 is located on the horizontal line on the right or left side of the rotating body. It is output every rotation of .

When the unbalanced timing pulse output from the waveform rectifier circuit 13 is input to the control circuit 14, a counter in the control circuit 14 starts counting the output pulses of the rotation detector 8 using the unbalanced timing pulse as a gate start. At the same time, a brake is applied to the prime mover 4 by the brake unit to rotate the rotating body 1 at a slow speed. Now, suppose that the number of output pulses of the rotation detector 8 is 3601 for 101 rotations of the rotating body, the count number of the counter reaches 3600 J, and the rotating body 1 reaches 1
When it rotates to 0 and the unbalanced part is located on the horizontal line passing through the center, control is achieved! Even if the driving of the driving rock 4 is stopped in the IIh section, in the above-mentioned operation, when the driving motor number is decelerated by adding a stab m to the driving motor number, the rotating body 1 and the drive side belt 7 are Although a slip occurs between the rotation detector 8 and the rotation detector 8, the inertia of the rotation detector 8 is almost zero.
There is no slippage at all between the rotating body 1 and the rotating body 1, and the rotation detector $ accurately follows sudden changes in the rotation of the rotating body 1 and reliably detects its rotation. Although it rotates at a low speed, there is almost no slippage, and the rotating body 1t can be accurately stopped at a predetermined angle with a count of 5l-3600J. Also, f-360
Even if a slip should occur when stopping at a count of 0J, the counter will accurately count the extra rotation due to the slip of the rotating body 1. For example, if the count number of the counter is 13610J, it means that the unbalanced part of the rotating body 1 has made a full rotation by 1□' from the horizontal line passing through the center, so the rotating body 1 is rotated in the opposite direction by this rotation angle. If you rotate it, the unbalanced part will be located exactly on the horizontal line passing through the center.

In the above embodiment, the unbalanced portion of the rotating body 1 is
9 may be stopped on a vertical line passing through the center of the rotating body 1, in which case the count number of the counter is (360
The prime mover 4 may be stopped when the value reaches 3690 (X10)+(360÷4)=3690.

As described above, according to the rotating body balance measuring device of the present invention, the rotational energy of the rotating body is transmitted to a rotation detector whose inertia is equal to zero, to a belt different from the belt for transmitting the rotation of the prime mover. Because of this, the rotation detector can accurately follow sudden changes in rotation of the rotating body, measurement errors are almost nil, and extremely precise balance correction can be performed. In particular, the present invention can be applied to the balance measurement of a rotating body that is heavy and requires precision, and achieves remarkable results.

[Brief explanation of drawings]

The drawings show an embodiment of the balance measuring device for a rotating body according to the present invention, and FIG. 1 is a schematic configuration diagram, and FIG.
It is a waveform diagram of each output signal of the roll detector and waveform shaping circuit of a figure. 1...Rotating body 2, 3-Rolling detector 4...
Prime mover 6, 6 - Drive side pulley 7... Drive side belt 8 - One revolution detector 9 - - Detection side pulley 10
...Detection side belt 14...Control circuit Patent applicant Denshi Seiso Kogyo Co., Ltd. Representative patent attorney Iwao Sugimoto Patent attorney Iwao Sugimoto Figure 2

Claims (1)

[Claims] (1) A pair of rolling detectors that support a rotating body to be measured on a shaft so that it can rotate freely and roll freely, a prime mover that controls the rotation of the rotating body via a drive-side pulley and a drive-side belt, and a detection side A rotation detector rotates in conjunction with the rotating body via a pulley and a detection side belt tracker and outputs a pulse at every fixed rotation angle, and the motor is controlled by the output signals of the roll detector and upper rotation detector. and a control circuit that controls the rotation of the rotating body and measures and detects the position of an unbalanced portion of the rotating body based on the number of output pulses of the rotation detector.