JP2521482B2 - Method for driving object under measurement in unbalanced measurement and device used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applicable to unbalance measurement and unbalance point positioning of a rotating body such as a rotating object to be measured of an electric motor, a fan, and a rotating shaft that require a rotational balance. The present invention relates to a drive device used and a device used in the method.

[Conventional technology]

In the conventional driving method, the elasticity of the rubber belt that drives the object to be measured is weakened so that the rotation of the driving side is transmitted loosely to the object to be measured so as not to affect the correction surface separation and calculation of the unbalanced measurement. I have to.

The weak elastic rubber belt is used to drive the object to be accelerated and decelerated.

[Problems to be solved]

According to the conventional technique, as described above, even when the object to be measured is accelerated or decelerated, it is driven by the weak elastic rubber belt and thus slips easily, and the rotational speed can be changed extremely slowly.

That is, the time required to start rotation of the non-rotating DUT to reach the predetermined high-speed rotation required for unbalance measurement and the time required to decelerate and stop after the unbalance measurement become long. Therefore, there is a problem that only a small number of objects to be measured can be processed per unit time.

[Means for solving problems]

The present invention has been made in view of the above problems, in the measured object driving method in the unbalanced measurement according to the present invention, by starting the rotation of the measured object to start and accelerate the rotation of the measured object. In the case of accelerating or decelerating the rotation of the measured object and stopping it, the rotation of the drive side is strongly transmitted to the measured object side, and the driving side and the measured object side are separated. When measuring the unbalance by increasing the frictional force between them and rotating the measured object at a high speed, the vibration caused by the unbalance of the measured object is generated by loosely transmitting the rotation of the driving side to the measured object side. I was allowed to.

Then, in the device for driving the object to be measured in the unbalance measurement according to the present invention, the drive motor and the friction force between the driving side and the object to be measured are strongly transmitted to the object to be measured by rotating the rotation of the drive motor. A strong transmission means for enlarging, a slow transmission means for loosely transmitting the rotation of the drive motor to the object to be measured to generate vibration due to imbalance of the object to be measured, the strong transmission means and the slow transmission means. And a switching means for switching.

[Action]

In the method of driving an object to be measured in imbalance measurement according to the present invention, the rotation and acceleration of the object to be measured is started and accelerated, or the rotation of the object to be measured is decelerated and stopped. In at least one of the above conditions, the frictional force between the drive side and the DUT side is increased by strongly transmitting the rotation on the drive side to the DUT side. Even if it is changed to, the slip between the two does not occur, and the rotation speed of the object to be measured also changes.

Once the rotation speed of the measured object reaches a predetermined high-speed rotation and unbalance measurement is performed, the rotation of the driving side is loosely transmitted to the measured object side, so vibration caused by unbalance of the measured object is generated. Occurs, the rotation of the object to be measured is kept at a predetermined number of revolutions without affecting the correction surface separation and calculation in the unbalanced measurement.

Then, in the measured object drive device in the unbalanced measurement according to the present invention, in the case of at least one of the case of starting and accelerating the rotation of the measured object or decelerating and stopping the rotation of the measured object. By switching to the strong transmission means by the switching means, the rotation of the drive motor is strongly transmitted to the object to be measured, and the frictional force between the driving side and the object side is increased, so that the rotation of the drive motor is increased. Slip between the two does not occur even if the speed is changed abruptly, and the rotation speed of the measured object also changes.

Once the rotation speed of the object to be measured reaches a predetermined high speed rotation, the switching means switches to the slow transfer means, whereby the rotation of the drive motor is loosely transferred to the object to be measured by the slow transfer means. Since it is driven in this manner, vibration due to the imbalance of the object to be measured is generated, and the imbalance measurement is performed.

In short, when the rotation of the object to be measured is forcibly changed, it is transmitted by the strong transmission means and caused by the imbalance of the object to be measured without externally affecting the rotation of the object to be measured. When generating the vibration, the transmission is driven by the slow transmission means.

[First Embodiment] Preferred embodiments of a method of driving an object to be measured in imbalance measurement according to the present invention and an apparatus used for the method will be described in detail below with reference to the drawings.

FIG. 1 is a front view of the drive unit of the embodiment, and FIG. 2 is a first view.
FIG. 3 is a sectional view taken along the line AA ′ in FIG. 3, and FIG. 3 is a front view of the drive unit showing a state in which an object to be measured is driven by a strong elastic belt.

In FIGS. 1, 2, and 3, the drive pulley 1
The strong elastic belt 3 is hung on the free pulley 2 and the weak elastic belt 5 is hung on the pulleys 1 and 2 and the auxiliary pulleys 4 and 4.
The above pulleys 1, 2, 4, 4 are provided on the plate 8, and the plate 8 is moved up and down by the power cylinder 9 provided on the frame 11. Then, the vibration of the DUT 6 is detected by the vibration detector 7 and analyzed by the unbalance measuring circuit to obtain the unbalance point phase and the unbalance amount. 12
Is a slide device for sliding the frame 11.

In the above configuration, when accelerating the object to be measured 6, as shown in FIG. 3, the power cylinder 9 reaches a position where the ferro-elastic belt 3 is in strong contact with the object to be measured 6.
To lower the plate 8. When the drive pulley 1 is started to rotate by the drive motor, the DUT 6 is driven by the belts 3 and 5 that are in contact with each other. At this time, the weak elastic belt 5 is easily stretched. Therefore, the driving force is weak, but since the strong elastic belt 3 is difficult to expand, it strongly presses against the object to be measured 6 and the frictional force increases, so that the object to be measured 6 is driven sufficiently strongly. Therefore, even if the vehicle is accelerated rapidly, no slip occurs and the desired high speed rotation is reached in a short time.

Once the predetermined high-speed rotation is reached, the imbalance measurement is started. At this time, the power cylinder 9 raises the plate 8, and as shown in FIG. The plate 8 is located at a position where the plate 8 is completely separated, and the weak elastic belt 5 loosely contacts the object 6 to be measured, and is driven to such an extent that the decrease in the rotation speed of the object 6 is prevented.

In this state, the vibration caused by the unbalanced point of the DUT 6 is detected by the vibration detector 7 and analyzed by the unbalance measuring circuit to obtain the unbalance amount and position of the DUT 6. Of.

When the imbalance measurement is completed, the plate 8 is again lowered by the power cylinder 9, and the strong elastic belt 3 is pressed against the DUT 6 as shown in FIG. 3 to control the rotation of the motor. Then, the DUT 6 is decelerated via the strong elastic belt 3 to accurately stop the unbalanced point at a predetermined position.

Since the speeds of the strong elastic belt 3 and the weak elastic belt 5 are the same, it is possible to make a smooth transition when the strong elastic belt 3 starts contact with the object 6 to be measured and when it begins to separate.

The device for measuring an object to be measured according to the present invention has been described above, and an embodiment of a double-sided imbalance correction device having the device to be measured is described below with reference to the drawings.

FIG. 11 is a side view, partly in section, of a double-sided imbalance correction device equipped with a device for driving an object to be measured according to the present invention.

In FIG. 11, 13 is an unbalance measuring device for measuring the unbalance of the DUT 6 carried by the manufacturing line transport device, in which the DUT 6 is driven by the DUT driving device according to the present invention. Are configured to be driven.

15 is an unbalance correction device that corrects the unbalance of the measured object based on the result obtained by the unbalance measuring device 13, a fixing device 16 for fixing the measured object, a cutter unit 17, and the movement of the cutter unit 17. It is composed of a device 18.

Reference numeral 19 is a cutter unit 17 of the unbalance correction device 15 for rotating an unbalanced point of the second surface by rotating the object to be measured by a predetermined amount based on the difference between the positions of the unbalanced points of the first surface and the second surface. Is a positioning device for positioning in a direction facing the cutter blade 20 (hereinafter referred to as a correction direction).

Reference numeral 21 denotes a transfer device that includes two pairs of clamp hands 22a, 23a, 22b, and 23b and moves on the rail 24. Each pair of clamp hands is arranged in a V shape. Of the two pairs of clamp hands, the clamp hands 22a and 22b are provided with rotary actuators 25a and 25b that rotate forward and backward through 180 ° about the longitudinal direction of the clamp hands.

Reference numeral 26 is a control panel for controlling the unbalance measuring device 13, the unbalance correcting device 15, the positioning device 19, and the carrying device 21, and has the unbalance measuring circuit 10 built therein.

In the double-sided imbalance correction device having the above-described configuration, the unbalance measuring device for measuring the object 6 conveyed by a turntable type conveying device or a linear production line conveying device is used.
The measurement is made at 13 and analyzed by the imbalance measuring circuit 10,
The position and the amount of unbalance of the surface and the position and the amount of unbalance of the second surface are obtained and stored in the control panel 26. Then, in response to a command from the control panel 26, the DUT 6 is rotated by a predetermined amount to position the unbalanced point in the correction direction.

Next, the transfer device 21 suspended on the rail 24 is moved to the upper part of the imbalance measuring device 13, grasped by the clamp hand 23a, set on the imbalance correcting device 15, and fixed by the fixing device 16.

Here, the cutter unit 17 is controlled based on the unbalanced amount of the first surface stored in the control panel 26,
The DUT 6 is cut by a predetermined amount to complete the imbalance correction of the first surface.

Next, by controlling the transfer device 21, the clamp hand 22b grips the DUT 6 and the positioning device 19
Transfer to. At this time, the clamp hand 22b is rotated 180 ° about the longitudinal direction as a rotation axis.

The positioning device 19 rotates the set object 6 to be measured about the axis thereof by a predetermined amount to position the unbalanced point in the correction direction.

Next, the conveyance device 21 is controlled to grasp and convey the DUT 6 by the clamp hand 23b, and the clamped device 23 is set in the imbalance correction device 15.

Here, the control panel is fixed by the fixing device 16 as described above.
The cutter unit 17 is controlled on the basis of the unbalance amount of the second surface stored in 26, and a predetermined amount is cut to complete the second surface unbalance correction. At this time, since the cutter unit 17 cuts from the outer side to the inner side in the same manner as when correcting the unbalance of the first surface, the occurrence of burrs is prevented.

In the above steps, since the unbalance correction is completed on both sides, the carrier device 21 is controlled, returned to the manufacturing line carrier device, and after the unbalance measurement is performed again, if it passes within a predetermined standard value, then Then, if the result exceeds the standard value and the result is unacceptable, the imbalance measurement is performed again.

In addition, when moving from the unbalance correction work of the first surface to the positioning work, since it was rotated 180 °, when the unbalance correction is completed on both sides and when it is returned to the manufacturing line carrying device, it is rotated 180 ° and then returned. The orientation of the measured object becomes the same before and after the imbalance correction work, which is convenient for re-measurement.

Further, in order to eliminate the idle time of the imbalance measuring device 13, the imbalance correcting device 15, and the positioning device 19, the carrying device 21 is used.
Is provided with two pairs of clamp hands, and when setting the measured object in each of the devices, the measured object to be set is conveyed by one of the pair of clamp hands 22a, 23a, for example, the clamp hand 22a. Come and the other clamp hand 2
Subsequent to receiving the object to be measured that has completed the process in 3a, the object to be measured conveyed by the clamp hand 22a is set.

In short, the two pairs of clamp hands 22a, 23a, 22b, 23
By b, the operation of receiving the object to be measured from each device and the operation of setting the next object to be measured are continuously performed, and the idle time of each device is reduced as much as possible so that the devices operate at full capacity.

The unbalance correction device 15 may be provided with a positioning device and a rotating device to reduce the area occupied by the entire device.

Next, the imbalance measuring circuit 10 provided in the above-described double-sided imbalance correction device will be described in detail with reference to the block diagram shown in FIG.

First, the description from deceleration to stop for positioning by the unbalanced phase signal during high-speed measurement rotation is as follows.

In FIG. 12, the DUT 6 is rotated at high speed by the weak elastic belt 5 and the vibration detection signal from the vibration detector 7 is guided to the filter 27 to obtain an unbalanced signal. The unbalance amount obtained from the unbalance signal is measured and stored by the unbalance amount measuring circuit 28. Then, the unbalanced signal is input to the unbalanced phase signal generator 29 to obtain the unbalanced phase signal.

The positioning start signal and the unbalanced phase signal from the control unit 31 are input to the gate circuit 30, and when the two inputs are present, the gate circuit 30 outputs. This output triggers the Q output of the flip-flop 38 to close the analog switch 33 of the drive control voltage generator 32.

At this time, since the analog switch 34 is opened by the signal from the control unit 31, the charge stored in the charge capacitor C is discharged through the discharge resistor VR2, and the drive control voltage output from the drive control voltage generator 32 is output. Then, the oscillation frequency of the voltage-frequency converter 35 decreases, corresponding to the output decrease of the drive control voltage generator 32, and the rotation of the drive motor 37 is started to decelerate via the driver 36.

When the deceleration is started, the power cylinder 9 is operated to lower the plate 8 to bring the strong elastic belt 3 into contact with the DUT 6 to decelerate.

Then, the drive control voltage becomes a stop voltage after a predetermined time when the charge of the charge capacitor C forming the CR timer by the Miller integration is charged in the drive control voltage generator 32, and the oscillation of the voltage-frequency converter 35 occurs. Stopped,
The drive motor 37 is stopped via the driver 36 to stop the DUT 6.

At this time, the deceleration of the DUT 6 can be selected by adjusting the discharge resistance VR2 of the charge capacitor C of the drive control voltage generator 32 and the stop time can be set to an arbitrary time. The unbalanced point of the measured object can be stopped at an arbitrary position.

 Next, the description of the start of measurement is as follows.

First, after setting the object 6 to be measured, the plate 8 is lowered to bring the strong elastic belt 3 into contact with the object 6 to be measured.

Then, the rotation of the DUT 6 is started by the reset signal from the control unit 31 to the flip-flop 38 and the closing signal to the analog switch 34. At this time, charge resistance
The charge capacitor C is started to be charged by the current adjusted by VR1, the drive control voltage output from the drive control voltage generator 32 starts to increase, and the oscillation frequency of the voltage-frequency converter 35 is proportional to the drive control voltage. Then rise and driver
The 36 and the drive motor 37 are actuated to start the rotation of the DUT 6 via the strong elastic belt 3.

When the rotation speed of the DUT 6 reaches a high-speed measurement rotation speed suitable for unbalanced measurement, the power cylinder 9 is operated to raise the plate 8 and close the analog switch 34 to drive the drive. With the control voltage kept constant, only the weak elastic belt 5 is brought into contact with the object 6 to be measured, and the unbalance measurement is started by rotating the belt 5 at a constant speed.

The rate of increase in rotation can be adjusted by adjusting the charge resistance VR1.

That is, according to the method of driving an object to be measured in imbalance measurement according to the present invention and the apparatus used for the method, the strong elastic belt 3 is used when accelerating and decelerating the rotation of the object to be measured.
By driving with, the slip does not occur even if the acceleration or deceleration is performed abruptly, so that the positioning time can be shortened and the positioning can be accurately performed.

In addition, according to the double-sided correction device of the present embodiment, both sides of the unbalance correction can be performed by one set of cutter units, so that the double-sided imbalance correction device can be manufactured in a small size, simple and inexpensive.

Second Embodiment In addition to the above embodiments, the drive device may have the following configuration.

According to the second embodiment of the drive device shown in FIG. 4, the weakly elastic belt 5 is wound around the drive pulley 1 and the free pulleys 2, 2 and these pulleys are provided on the plate 8 and are vertically moved by the power cylinder. To move.

When the rotation of the drive pulley 1 is loosely transmitted to the DUT 6, as shown in FIG. 4A, the weak elastic belt 5 is loosely contacted with the DUT 6, and the plate 8
To generate vibrations due to the unbalanced points.

When strongly transmitting the rotation of the drive pulley 1 to the DUT 6 in order to accelerate and decelerate the rotation of the DUT,
As shown in FIG. 2B, by lowering the position of the plate 8, the weak elastic belt 5 is expanded to increase the tension, and the measured object 6 and the weak elastic belt 5 are strongly pressed against each other. Prevents slippage by increasing contact area and friction force.

[Third Embodiment] Alternatively, according to the third embodiment shown in FIG. 5, in order to accelerate and decelerate the rotation of the DUT 6 by providing the auxiliary pulley 38 as shown in FIG. When strongly transmitting the rotation of the drive pulley 1 to the DUT 6, the auxiliary pulley 38 presses the weak elastic belt 5 against the outer peripheral surface of the DUT 6, as shown in FIG. 5 (b). Then, the frictional force may be increased.

[Fourth Embodiment] Alternatively, according to the fourth embodiment shown in FIG. 6, as shown in FIG. 6 (a), the pulley pulleys 2, 2 are arranged with a short interval, When the rotation of the drive pulley 1 is strongly transmitted to the DUT 6 for accelerating and decelerating the rotation of the DUT, the position of the plate 8 is lowered as shown in FIG. The friction force may be increased by sandwiching the weak elastic belt 5 between the free pulleys 2 and 2 and the DUT 6. In this case, since the weak elastic belt 5 does not stretch as much as the weak elastic belt in the second embodiment, the deterioration is small.

[Fifth Embodiment] In the above-described embodiments, the belt is arranged above the DUT 6, but the belt may be arranged below the DUT 6 as described below.

According to the fifth embodiment, as shown in FIG. 7 (a), the electromagnet 39 is arranged below the DUT 6 driven by the lower surface of the weak elastic belt 5 coming into contact therewith.

Then, when accelerating or decelerating the rotation of the DUT 6, the position of the free pulleys 2, 2 is raised by raising the plate 8 as shown in FIG. 7 (b). At this time, in order to prevent the DUT 6 from being lifted, when the electromagnet 39 is excited to attract the DUT 6 and prevent the DUT 6 from being lifted, the weak elastic belt 5 stretches to some extent. Since the tension increases, the weak elastic belt 5 is strongly pressed against the object 6 to be measured, so that the frictional force increases.

[Sixth Embodiment] Alternatively, according to the sixth embodiment, when the auxiliary pulley 40 is provided as shown in Fig. 8 (a) and the object to be measured is accelerated or decelerated, the free pulleys 2 and 2 are The electromagnet 39 is excited without moving, and the weak elastic belt 5 is sandwiched by the auxiliary pulley 40 from below as shown in FIG. The frictional force may be increased to increase the transmission force.

[Seventh Embodiment] Alternatively, according to the seventh embodiment, when the auxiliary pulley 41 is provided as shown in FIG. 9 (a) to accelerate and decelerate the rotation of the DUT 6, FIG. ), The auxiliary pulley 41 presses the shaft of the DUT 6 and the free pulleys 2, 2 rise to increase the frictional force between the weak elastic belt 5 and the outer peripheral surface of the DUT 6. You may.

Instead of the auxiliary pulley 41, an air nozzle for ejecting compressed air may be provided to suppress lifting of the DUT 6. In this case, the compressed air is blown onto the outer peripheral surface of the DUT 6, thereby contributing to acceleration and deceleration of the rotation.

Eighth Embodiment In each of the above-described embodiments, the case where the belt is arranged on the upper side or the lower side of the DUT 6 is shown. However, the belt is arranged beside the DUT 6 as in the following example. You may.

According to the eighth embodiment, as shown in FIG. 10 (a), a belt device including a drive pulley 1, a free pulley 2 and a weak elastic belt 5 hung on both pulleys is provided on the left and right of the DUT 6. When the DUTs 6 are respectively arranged and the DUT 6 is rotated at a constant speed at a high speed, the two free pulleys are separated from each other so that the weak elastic belt 5 drives the DUT 6 loosely, and the rotation of the DUT 6 is accelerated. Alternatively, when decelerating, as shown in FIG. 10 (b), when the two free pulleys are brought close to each other, the weak elastic belt 5 expands to increase the tension and increase the frictional force with the DUT 6. Prevent slip.

In this case, if the distance between the two drive pulleys 1 and 1 is made shorter than the distance between the two free pulleys 2 and the two weak elastic belts 5 and 5 are arranged in a divergent manner, 6 stabilizes.

Although the example of changing the distance between the free pulleys has been described above,
Naturally, the same effect can be obtained by changing the distance between the drive pulleys.

Not limited to the above first to eighth embodiments, when accelerating or decelerating the rotation of the DUT, increase the frictional force between the driving side and the DUT, etc., and transmit without slip between them. All you have to do is increase your power.

In this way, in unbalanced measurement, the object to be measured is driven by the slow transmission means as in the conventional case, but in acceleration or deceleration, the object to be measured is driven by the strong transmission means in which no slip occurs. The effect is that acceleration and deceleration can be achieved in a short time.

Further, as described above, since the slip does not occur when the vehicle is decelerated, it is possible to obtain an effect that accurate positioning can be performed.

〔effect〕

As described above, according to the measured object driving method in the unbalanced device of the present invention, in the case of at least one of the case where the measured object is accelerated or decelerated,
By strongly transmitting the rotation of the drive side to the DUT side,
Since the slip is prevented from occurring even if the rotation speed on the drive side is suddenly changed, it is possible to obtain the effect that the imbalance measurement can be performed in a short time.

Further, as described above, since slip does not occur when stopping for positioning, there is an effect that accurate deceleration stop can be performed.

Moreover, once the rotation speed of the object to be measured reaches a predetermined high speed rotation, the rotation on the drive side is transmitted loosely to the object to be measured, so that correction surface separation and calculation in imbalance measurement are not affected. Is natural.

Then, according to the DUT driving device in the unbalanced measurement used in the above method, the above-mentioned effect is obtained, and
Since the switching means switches between the strong transmission means and the slow transmission means to drive the object to be measured, it is possible to obtain an effect that unbalance measurement can be performed in a short time and accurate deceleration stop can be performed.

[Brief description of drawings]

FIG. 1 is a front view of the drive apparatus of the embodiment, FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. 3 is the drive in the state in which an object to be measured is driven by a strong elastic belt. FIG. 4 is a front view of the apparatus, FIG. 4 is a conceptual view of essential parts of the second embodiment, FIG. 5 is a conceptual view of essential parts of the third embodiment, and FIG. 6 is a conceptual view of essential parts of the fourth embodiment. Is the fifth
8 is a conceptual diagram of an essential part of the sixth embodiment, FIG. 9 is a conceptual diagram of an essential part of the seventh embodiment, and FIG. 10 is a conceptual diagram of an essential part of the eighth embodiment. FIG. 11 is a partial cross-sectional side view of an embodiment of a double-sided imbalance correction device equipped with an object drive device according to the present invention, and FIG. 12 is a block diagram of an imbalance measurement circuit. 1 ... Drive pulley, 2 ... Free pulley, 3 ... Strong elastic belt, 4 ... Auxiliary pulley, 5 ... Weak elastic belt, 6 ... Object to be measured, 7 ... Vibration detector, 8 ... Plate , 9 ... Power cylinder.

Claims (2)

(57) [Claims] 1. When at least one of the case of starting and accelerating the rotation of the object to be measured and the case of decelerating and stopping the rotation of the object to be measured, the rotation on the drive side is brought to the side of the object to be measured. When the unbalance measurement is performed by rotating the measured object at a high speed by increasing the frictional force between the driving side and the measured object side by transmitting strongly, the rotation of the driving side is loosely transmitted to the measured object side. A method of driving an object to be measured in imbalance measurement, in which vibration caused by imbalance of the object to be measured is generated. 2. A drive motor, strong transmission means for increasing the frictional force between the drive side and the measured object side by strongly transmitting the rotation of the drive motor to the measured object, and the rotation of the drive motor. A loose transmission means for generating vibrations due to imbalance of the measured object by loosely transmitting the measured object to the measured object,
An object drive device for unbalanced measurement, comprising: switching means for switching between the strong transmission means and the slow transmission means.