JPH04164567A - Liquid type automatic balancer - Google Patents

Abstract

PURPOSE:To perform the balance correction of a rotary body in a short time, by providing a shielding part in the circumferential direction of a balance ring, and composing it so that liquid is not flowed to a grinding wheel at the shielding part. CONSTITUTION:The liquid poured into a pocket 10 is flowed along the shielding part(projection bar) 20 provided in the circumferential direction of a balance ring 2 even in the case of its flowing to the external part from the pocket 10. So it can be prevented that the liquid L is flowed to a grinding wheel 9 side. Therefore a rotary body(grinding wheel 9) is not ill-balanced by the liquid, and the balance correction of the rotary body can be performed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid autobalancer for automatically correcting the imbalance of a rotating body such as a grindstone using a liquid.

[Prior Art] Conventionally, as shown in FIGS. 10 and 11, liquid 25 is applied to a balance ring 27 provided around the axis of a grindstone 26 by a liquid injection nozzle (not shown) connected to a pump (not shown). A liquid type autobalancer has been proposed in which the unbalance of the grinding wheel 26 is corrected by selectively injecting liquid into a plurality of pockets 29 arranged in a ring through a partition wall 28.

A plurality of pockets 29 provided around the balance ring 27 of the liquid autobalancer are constituted by a balance ring main body 30 and a ring member 31 attached to the lower side thereof. Further, the ring member 31 forms an injection port 32 through which the liquid 25 injected by the injection nozzle passes.

[Problem to be solved by the invention] However, the liquid autobalancer
After processing the workpiece with the grindstone 26 while correcting the imbalance of 31 and the surfaces of the balance ring main body 30, and will reach the grindstone 26.

Therefore, the liquid 25 flowing out to the lower side of the whetstone 26 adheres to the side surface of the whetstone 26, so this liquid 25 causes the whetstone to
If the balance of the liquid 25 is lost and the grindstone 26 is rotated again to process the workpiece, it is necessary to make corrections including the imbalance of the liquid 25. However, whetstone 26
When the liquid 25 is rotated, the centrifugal force causes the liquid 25 to be gradually blown away, making the unbalance amount unstable. As a result,
If the liquid 25 adheres to a part of the grindstone 26, there is a problem in that it takes a lot of time to correct the imbalance of the grindstone.

An object of the present invention is to provide a liquid autobalancer that prevents the liquid injected into the balance ring from adhering to the grindstone and shortens the time required to correct the balance of the rotating body.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a balance ring provided around the axis of a rotating body with a plurality of pockets arranged in rows by a partition wall, In a liquid auto balancer that corrects unbalance of a rotating body by injecting liquid into a pocket with a liquid injection nozzle, a shielding part is provided in a part of the circumferential direction of the balance ring, and the shielding part prevents the liquid from flowing out. The gist of this is to prevent it from flowing to the grindstone.

[Function] With the above configuration, even if the liquid injected into the pocket flows out from the pocket, it flows along the shielding part provided in the circumferential direction of the balance ring, thereby preventing the liquid from flowing toward the grinding wheel. can do.

[Example] Hereinafter, an example in which the present invention is embodied in a liquid autobalancer for a grinding wheel will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 3, the liquid autobalancer of this embodiment is composed of a balance ring 2, a liquid injection nozzle 3a, an air injection nozzle 3, and a gas-liquid supply tank 4. The balance ring 2 is composed of a balance ring main body 2a and a lid ring 11. The balance ring main body 2a is attached to a holder 7 fixed to the main shaft 6 of the grinding machine 5 via a screw 8, and a grindstone 9 as a rotating body is clamped and fixed between the ring main body 2a and the holder 7. has been done.

A partition wall 10a is provided in front of the balance ring main body 2a.
A plurality of (24 in the illustrated example) pockets 10 are arranged in a ring shape at equal intervals through the pockets.

This pocket 10 is formed into a substantially rectangular shape from the front, and the lid ring II is disposed so as to cover the entire pocket 10, and is attached to the front surface of the balance ring main body 2a by a screw 12 screwed into the partition wall LOa. has been done.

Further, as shown in FIG. 2, a protrusion 20 is formed on the outer circumferential edge of the lid ring 11 and serves as a shielding portion that protrudes from the outer circumferential surface of the balance ring main body 2a.

The inner open portion of each pocket 10 that is not covered by the lid ring 11 serves as an injection port 13. Further, as shown in FIG. 2, a plurality of balance pieces 15a for performing preliminary manual balancing can be selectively inserted into a plurality of screw holes 14a arranged in an annular manner inside the injection port 13. It can be screwed on.

As shown in FIG. 3, the air injection nozzle 3 of this embodiment is arranged close to the front surface of the balance ring 2 via a suitable support member such as a grindstone cover (not shown) so as to face the injection port 13 of the pocket 10. ing. Further, a liquid injection nozzle 3a is provided outside the air injection nozzle 3, and is arranged to face the injection port 13 of the pocket 10 similarly to the air injection nozzle 3.

The air injection nozzle 3 uses a gasoline injector with a built-in electromagnetic coil and a needle valve that is opened and closed by the electromagnetic coil.In addition, a pressure-type element is used to amplify ultrasonic vibrations using a horn to open and close the injection valve. It is also possible to use a type of ultrasonic injector.

Note that the air injection nozzle 3, the liquid injection nozzle 3a, and the balance ring 2 may be arranged on the back side of the grindstone 9.

An air pipe 19 is connected to the air injection nozzle 3, and this air pipe 19 is connected to the gas-liquid supply tank 4 via an air valve 19a.

Further, a liquid pipe 18 is connected to the liquid injection nozzle 3a, and a gas-liquid supply tank 4 is connected via a liquid valve 18a.
It is connected to the. The gas-liquid supply tank 4 has a sealed structure, and a liquid such as clean water or grinding fluid is stored inside the tank 4, and is pressurized to a predetermined pressure by pressurized air A from an air source (not shown). It can be sprayed.

When the liquid valve 18a is opened, a large amount of liquid in the gas-liquid supply tank 4 is supplied to the liquid injection nozzle 3a via the liquid pipe 18, and when the air valve 19a is opened, the gas-liquid supply tank 4 is Pressurized air A inside is supplied to the air injection nozzle 3 via an air pipe 19. Note that I5 is a detection device that detects imbalance of the grindstone 9.

The operation and effects of the liquid autobalancer configured as described above will be explained.

First, when performing balancing work, when the air valve 19a is opened by a command from a control device (not shown) while the rotation of the grindstone 9 is slowed down, the pressurized air A injected from the air injection nozzle 3 is injected. It is injected into all the pockets 10 through the inlet 13, and the liquid, chips, etc. remaining in the pockets 10 are discharged to the outside by the pressure. Therefore, the balancing operation can be performed accurately without any residue remaining in the pocket 10. In addition, whetstone 9
When stopping, it is necessary to rotate the grindstone by hand so that all pockets 10 face the liquid jet nozzle 3.

When performing balancing work from this state, the detection device 1
When the liquid valve 18a is opened by a command signal from the control device based on the detection signal No. 5, the liquid injection nozzle 3a is opened.
The liquid injected from the inlet 13 of the balance ring 2
is injected into a specific pocket 10 through the grinding wheel 9.
It is held in the pocket 10 by the centrifugal force that accompanies the rotation. As a result, a predetermined amount of mass acts on a specific phase of the grinding wheel 9, thereby automatically correcting the imbalance of the grinding wheel 9.

In addition, when the drive of the grinder 5 is stopped after the work is completed, the main shaft 6
The rotation of the grindstone 9 gradually decreases and the grindstone 9 eventually stops. Then, when the grindstone 9 rotates at a low speed, pressurized air A is injected from the air injection nozzle 3 to blow off the liquid in the pocket 10 in the balance ring 2. However, the liquid cannot be completely blown away from inside the pocket 10, and some liquid remains inside the pocket 10, so when the grinding wheel 9 stops, as shown by the arrow in FIG.
Some liquid remaining in the pocket 10 of the balance ring 2 flows out from the pocket IO and flows along the surface of the lid ring 11, but the protrusion 20 of the lid ring 11 prevents it from flowing toward the balance ring main body 2a. prevent. Therefore, the liquid drips downward from the protrusion 20 of the lid ring IX.

Therefore, it is possible to prevent liquid from adhering to the side surface of the grindstone 9. As a result, the liquid does not partially adhere to the side surface of the grindstone 9, so that the balance of the grindstone 9 is not lost due to the liquid. Therefore, even if the grinding wheel 9 is rotated again, the unbalance caused by the liquid is not included, so that the unbalance can be corrected in a short time.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be configured as follows without departing from the spirit of the present invention.

(1) As shown in FIGS. 5 to 7, in the above embodiment, the protrusion 20 is formed on the lid ring 11, but it is also possible to form it so as to protrude from the outer circumferential surface of the balance ring main body 2a side. .

(2) As shown in FIG. 8, it is also possible to integrally form the balance ring 2 and the protrusions 20. Further, as shown in FIG. 9, it is also possible to form a groove 21 as a shielding part on the outer peripheral surface of the balance ring main body 2a instead of the protrusion 20 to prevent liquid from flowing toward the grinding wheel 9. be.

(3) Furthermore, although the air injection nozzle 3 and the liquid injection nozzle 3a are configured as one unit, it is also possible to configure them as separate bodies.

"Effects of the Invention As detailed above, according to the present invention, since the protrusions prevent liquid from adhering to the rotating body, the balance of the rotating body is not disturbed by the liquid, and the balance correction of the rotating body can be done quickly. The effect is that it can be done in a short amount of time.

[Brief explanation of the drawing]

Figure 1 is a partially enlarged view showing the balance ring installed on the grindstone, Figure 2 is a partial sectional view showing the lid ring with protrusions, and Figure 3 is a configuration diagram of the liquid auto balancer. , Fig. 4 is a partially enlarged sectional view showing the lower side of the balance ring, Fig. 5 is a partially enlarged view showing another example of the balance ring installed on the grindstone, and Fig. 6 shows the protrusion on the balance ring body. 7 is a partially enlarged sectional view showing the lower side of another example of the balance ring; FIG. 8 is a partially enlarged sectional view showing another example of the balance ring; FIG. 9 is a partially enlarged sectional view showing another example of a balance ring, FIG. 10 is a partially enlarged sectional view showing a conventional balance ring, and FIG. 11 is a partially enlarged sectional view showing a conventional balance ring. 2... Balance ring, 3a... Liquid injection nozzle,
9... Grindstone as a rotating body, 10... Pocket, 1
0a...Partition wall, 20...Protrusion as a shielding part,
21...Groove as a shielding part, L...Liquid. Patent applicant: Nagase Iron Works Co., Ltd.
Person Patent Attorney On 1) Renshi (1 other person) Figure 8 Chi Figure 9

Claims (1)

[Claims] 1. A balance ring (2) provided around the axis of a rotating body (9) is provided with a plurality of pockets (10) arranged in a row by a partition wall (10a), 10) is a liquid auto balancer in which liquid (L) is injected through a liquid injection nozzle (3a) to correct the unbalance of the rotating body (9), and a shielding portion is provided in the circumferential direction of the balance ring (2). (20
, 21), and the liquid (L) is prevented from flowing to the grindstone (9) by the shielding part (20, 21).