JPH04131540A - Balance corrector for rotor - Google Patents

Abstract

PURPOSE:To correct balance by disposing balance rings each having an unbalance weight on the outer periphery of a spindle via vibrators, and rotating the balance rings up to balance positions by the vibration of the vibrators. CONSTITUTION:A grinding wheel flange 4 is tightened on a spindle 3 of a grinder 1. A pair of vibrators 13, 14 each constituting of a piezoelectric element are provided, and a couple of balance rings 15, 16 are rotatably disposed. When rotating torque is generated due to deformation with application of a DC current to the vibrating rings (vibrators) 13, 14, the balance rings 15, 16 are rotated. A required turning amount of the balance rings 15, 16 of a balance corrector 10 is calculated on the basis of the maximum vibrating amount of the grinding wheel 9, and a controller outputs a correction signal to correct the balance of the grinding wheel 9. Therefore, responsiveness of balance correction is enhanced, and the constitution of the corrector can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a balance correction device for correcting the balance of a rotating body.

[Prior Art] Conventionally, various devices have been proposed for correcting the balance of a rotating body. For example, in a correction device for correcting the balance of a grinding wheel of a grinding machine, a storage part is formed in the grinding wheel flange that fixes the grinding wheel to the main shaft, and inside the storage part, a balance ring having an unbalance amount can be rotated around the outer periphery of the main shaft. It has been proposed that the The balance ring is rotated by a motor disposed within the storage portion of the grindstone flange to correct the balance of the grindstone.

[Problems to be Solved by the Invention] However, when the balance ring is rotated in the above-mentioned balance correction device, there is a problem in that the centrifugal force of the grinding wheel causes the response of the motor to deteriorate because the grindstone is rotating at high speed. In addition, there is a problem that either the drive voltage of the motor is low or a large drive current is required, resulting in a large power loss. The drive power for the motor must be obtained from a slip ring or the like installed on the main shaft, making the structure complex and requiring space to house the motor, making the entire balance correction device larger. There is a problem with putting it away.

An object of the present invention is to provide a balance correction device for a rotating body that can improve the responsiveness of balance correction, simplify the structure of the balance correction device, and make the entire balance correction device compact.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a balance correction device for correcting the balance of a rotating body, in which a vibrator is connected to the outer periphery of a main shaft that rotates the rotating body. The gist is to rotatably arrange a balance link having an unbalanced amount, and to rotate the balance ring to a position where the rotation of the rotating body is balanced by the vibration of the vibrator.

[Operation] With the above configuration, the balance ring rotates due to the vibration of the vibrator, and the balance of the rotating body can be corrected.

[Embodiment] Hereinafter, an embodiment in which the present invention is embodied in a balance correction device for correcting the balance of a grinding wheel of a grinding machine will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1.3, the grinding wheel head 2 of the grinding machine 1 is provided with a main shaft 3 as a rotating shaft.

A tapered portion 3a is provided at the tip of the main shaft 3, and a grindstone flange 4 is fastened and fixed along this tapered portion 3a.

That is, the grindstone flange 4 is formed with a through hole 5 that abuts the tapered portion 3a of the main shaft 3, and the main shaft 3 is inserted through the through hole 5. The grindstone flange 4 is tightened by a nut 6 screwed onto the tip of the main shaft 3. Also,
This grindstone flange 4 is composed of an overhanging part 4a and a cylindrical part 4b, a recess 7 is bored in the cylindrical part 4b, and a male thread 8 is carved on the outer peripheral surface of the cylindrical part 4b. . Note that the nut 6 screwed onto the tip of the main shaft 3 is housed in the recess 7.

Further, a grindstone 9 as a rotating body is inserted through the cylindrical portion 4b of the grindstone flange 4, and one side of the grindstone 9 is in contact with the protruding portion 4a of the grindstone flange 4. A main body case 11 of a balance correcting device IO which also serves as a grindstone flange is screwed into a male screw 8 formed in the cylindrical portion 4b of the grindstone flange 4. That is, at the center of the main body case 11, a cylindrical portion 11a protruding from the inside of the main body case 11 is screwed into a cylindrical portion 4b of the grindstone flange 4. As a result, the grindstone 9 is fixedly attached to the main shaft 3 by the grindstone flange 4 and the main body case 11.

Inside the main body case 11, a circular locking protrusion 12 is formed at the bottom thereof. Further, on the outer peripheral surface of the cylindrical portion 11a of the main body case 11, a pair of vibration rings 13 and 14 as vibrators constituted by piezo elements are provided.

As shown in FIG. 2, the pair of vibrating rings 13.14
A pair of balance rings 1516 are rotatably disposed on the outer peripheral surface of the balance ring 1516 with a small gap (0.005 mm in this embodiment).

When a DC voltage is applied to the respective vibrating ring 13.14, the vibrating ring 13.14 stretches or distorts. Since this stretching/straining motion becomes a traveling wave in one direction, rotational torque is generated on the circumferential surface of the vibrating link 13,14. As a result, when a part of the inner peripheral surface of the balance link 15.16 comes into contact with the revolving vibration ring 13.14, the balance ring 15.16 rotates. This allows the vibrating rings 13, 14 to be rotated individually in one direction.

Further, by switching the polarity of the DC voltage applied to the vibration rings 13, 14, the balance rings 15, 16 can be rotated in the opposite direction.

A portion of the balance ring 15, 16 is provided with a through hole 15a for providing an unbalance amount.

16a is formed. In addition, in FIG. 2, inside the main body case 11, the vibration ring 1.
A control circuit 17 that controls the direct current voltage applied to 3.14 and a battery 18 that serves as a driving power source are provided.

Semicircular protrusions 19 are provided at predetermined intervals on the inner peripheral surface of the main body case 11, and small holes 19a are formed in the protrusions 19. The upper surface of the main body case 1 is covered by a case cover 20, and the small hole 1 of the protrusion 19 is
The case cover 20 is fixedly attached to the main case 11 by screwing screws 21a into the case cover 9a through the case cover 20.

In this embodiment, locking mechanisms 21 for holding the balance links 15 and 16 are provided at two locations on the inner surface of the case cover 20.

That is, as shown in FIGS. 1 and 5, the case cover 20
A cylindrical protruding member 22 is formed on the inner surface, and a storage portion 23 is formed inside the protruding member 22 .

Further, an insertion hole 24 communicating with the storage portion 23 is transparently provided in the center of the bottom surface of the protrusion member 22 . A ring-shaped actuator 28 made of a piezo element embedded in a circular groove 27 is provided on the bottom surface inside the storage section 23 .

A locking member 25 is disposed in the storage portion 23,
The locking member 25 includes a pressing portion 26 that is inserted through the insertion hole 24 and presses the side surface of the balance link 15, and a flange portion 29 that is pressed by the actuator 28. Further, a guide hole 30 is formed in the pressing portion 26 of the locking member 25, one end of a spring 31 is inserted into the guide hole 30, and the other end is inserted into a positioning hole provided inside the case cover 20. It is inserted in 32.

Therefore, when no voltage is applied to the actuator 28, the engaging member 25 moves toward the balance ring 15 due to the biasing force of the spring 31, and the pressing portion 26
or press the side of the balance ring 15. A pair of balance links 15 and 16 are held between this pressing portion 26 and the locking protrusion 12 provided on the main body case 11.

Further, when a voltage is applied to the actuator 28, the actuator 28 is distorted and extends.

Therefore, the actuator 28 presses the flange portion 29 of the locking member 25 against the biasing force of the spring 31. Then, since the locking member 25 moves toward the case cover 20, the pressing portion 26 of the locking member 25 separates from the side surface of the balance link 15. As a result, the clamping state of the balance rings 15 and 16 is released, and the balance rings 15 and 16 are released.
．． It becomes possible to rotate 16 or more. Therefore, the locking mechanism 21 allows the balance ring 15, 16 to be fixed and rotated as desired.

As shown in FIG. 3, an acceleration pickup 33 is attached to the grinding wheel head 2 of the grinding machine 1 to detect vibrations occurring throughout the grinding machine 1. As shown in FIG. The acceleration pickup 33 is connected to a control device 34, and the control device 34 determines the balance state based on the vibration detected by the acceleration pickup 33, that is, the maximum amount of vibration of the grinding wheel 9 and the phase at which it occurs (
unbalanced position).

Further, the control device 34 is connected to a modulation circuit 35, and the modulation circuit 35 receives a correction signal for correcting imbalance from the control device 34 and transmits it to the balance correction device 10 by radio.

As shown in FIG. 4, the control circuit 17 includes a modulation circuit 35
a demodulation circuit 36 that demodulates the corrected signal from the demodulation circuit 3;
6 and applying a voltage to the actuator 28 based on the correction signal from the respective vibrating ring 13.14.
and a drive device 37 that applies a voltage to.

Next, the operation and effect of the balance correction device configured as described above will be explained.

The grinding wheel 9 is rotated by the main shaft 3 of the grinding machine 1.

Then, the acceleration pickup 33 of the grinding wheel head 2 detects the vibration of the entire grinding machine 1. Then, the control device 34 specifies the maximum amount of vibration of the grindstone 9 and the phase at which it occurs based on the vibration signal detected by the acceleration pickup 33. Then, the control device 34 calculates how much and in which direction the pair of balance rings 15 and 16 in the balance correction device 10 need to be rotated.

Based on this calculation result, the control device 34 outputs a correction signal to the modulation circuit 35. The modulation circuit 35 modulates this correction signal and transmits it to the control circuit 17 of the balance correction device 10. The demodulation circuit 36 of the control circuit 17 demodulates the modulated correction signal and outputs it to the drive device 37.

The drive device 37 applies a voltage to the actuator 28 based on the correction signal from the demodulation circuit 36 . Then, the actuator 28 is distorted and extended by the voltage, and the flange portion 2 of the locking member 25 resists the biasing force of the spring 31.
9 toward the inner surface of the case cover 20. For this reason,
The locking member 25 moves toward the inner surface of the case cover 20, and the pressing portion 26 of the locking member 25 separates from the side surface of the balance ring 15, so that the pressing portion 26 and the locking protrusion 12 are released from being held. Ru. As a result, a pair of balance rings 15.
16 becomes rotatable.

In this state, the drive device 37 applies voltage to the vibrating rings 13 and 14. Then, the vibration links 13 and 14 are stretched and strained, rotating the balance rings 15 and 16, and based on the calculation result of the control device 34, the through holes 15a and 16a are moved to the position where the amount of vibration is maximum, thereby correcting the balance. .

Then, when the balance of the grinding wheel 9 is corrected, the drive device 3
7 stops applying voltage to the actuator 28. As a result, the distortion of the actuator 28 is released and it returns to its original shape, so the locking member 25 is again moved toward the lance link 15 by the biasing force of the spring 31, and the pressing portion 26 of the locking member 25 is balanced. Press the side of ring 15.

As a result, the pair of balance rings 15, 16 are held between the pressing portion 26 of the locking member 25 and the locking protrusion 12. Therefore, the balance can be stabilized by the balance rings 15 and 16.

Therefore, the control device 34 always controls the acceleration pickup 3.
Since the unbalance position can be detected based on the detection signal No. 3 and the balance of the rotation of the grindstone 9 can be corrected by the balance correction device 1O, the rotation of the grindstone 9 can be stabilized.

Further, since the driving voltage of the vibration ring 13.14 that rotates the balance ring 15.16 is several volts and the driving current is several mV, power loss can be reduced.

Furthermore, a vibration ring 13.1 of a rotational drive source serving as a motor
4 has almost the same structure as the balance links 15 and 16, so the overall structure can be simplified, the main body case 11 can be made smaller, and the balance correction device l
The entire O can be made compact.

Further, since the vibration rings 13, 14 made of piezo elements have a fast response, the balance rings 15, 16 can be rotated quickly, so that the balance can be corrected quickly.

Furthermore, a battery 18 serving as a driving power source is connected to the balance correction device 1.
Since it is provided inside the main body case 11 of the grinding machine 1, there is no need to provide a slip ring or the like for obtaining a driving power source in the grinding machine l, which is different from the conventional case, and the structure can be simplified.

It should be noted that this invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, the responsiveness of balance correction can be improved, and the structure of the balance correction device can be simplified to make the entire balance correction device compact. be.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the balance correction device according to the present invention, Fig. 2 is a front view of the balance correction device, Fig. 3 is a side view of the grinding machine, and Fig. 4 is an electric block diagram for controlling the balance correction device. , FIG. 5 is a partially enlarged sectional view showing the structure of the locking mechanism. 3...Main shaft, 9...Wheelstone as a rotating body, 13,1
4... Vibration link as a vibrator, 15.16...
balance ring. Patent applicant: Nagase Iron Works Co., Ltd.
Person Patent Attorney On 1) Hironobu (and 1 other person) Figure 4

Claims (1)

[Claims] 1. In a balance correction device (10) for correcting the balance of a rotating body (9), vibrators (13, 14 ), a balance ring (15, 16) having an unbalance amount is rotatably arranged, and the vibration of the vibrator (13, 14) causes the balance ring (
15, 16) to a position where the rotation of the rotating body (9) is balanced.