JPS58160058A - Automatic balancer of rotary grinding stone - Google Patents

Abstract

PURPOSE:To enable to perform grinding efficiently by a method wherein the generation of unbalance due to the wear or the like of the rotating grinding wheel is automatically detected and the unbalance is automatically compensated by supplying fluid. CONSTITUTION:When vibration occurs in a center axis 1 or the like due to the partial wear or the like of the rotating grinding wheel, a vibrometer 12 detects the vibration and nearly exactly cyclic vibration signals are obtained from the detected vibration by means of a band-pass filter 13. Controlling signals are formed from said vibration signals by means of a phase compensator 14 and inputted to a pulse generator 15 in order to be converted to pulses to generate. Said pulse signals are applied to a supersonic generator 16, resulting in generating amplified vibration in a vibration horn so as to vibrate a ball valve 22 in order to jet fluid from a fluid injection nozzle 17. The nozzle 17 is installed opposite to a plurality of pockets 7 provided concentric to the grinding wheel 4. Time lag based upon the phase difference in rotation between said controlling signals and generated pulses is adjusted by said phase compensator 14.

Description

[Detailed Description of the Invention] The present invention is based on a grinding wheel of a grinding machine, etc., in which the grinding surface of a rotary whetstone wears unevenly, causing unbalance and inducing vibration.
This is an automatic balancer device for rotary grinding wheels that automatically detects unbalance and automatically corrects vibrations when its performance deteriorates.
a plurality of fluid pockets arranged in a ring, a balanced fluid injection nozzle corresponding to each pocket in sequence as each pocket rotates, a vibration measuring means, and a vibration signal of the measuring means and a rotation angle of the unbalanced mass of the rotating grindstone A phase adjuster for adjusting the relationship, and a pulse generator are provided, the pulse generator is driven by the adjustment signal of the phase adjuster, and the output pulse signal is used to generate a signal in the vicinity of the unbalanced mass separated by 180° from the injection nozzle. This device is characterized by a configuration in which a balancing weight fluid is injected into the fluid pocket.

Although some automatic balancer devices for rotary grinding wheels of this kind are already in practical use, they are not easy to manufacture because they require modification of the grinding wheel shaft, and are relatively expensive. , 1, there are.

E. As shown in the embodiments to be described later, the present invention provides the following features: - In addition to detecting vibrations by a vibration measuring means, balancing weight fluid is injected from an injection nozzle into a pocket on the side of the grinding wheel without interfering with the grinding operation. The automatic correction of Δ is made, and both manufacturing and use are well suited to grinding work.

A preferred embodiment of the present invention will be described.

In the figure, reference numeral 2 denotes a whetstone holder to which a central shaft l is attached and fixed, and a rotary whetstone 4 is fitted onto its outer periphery, and the collar 3' of the ring fitting 3 and the whetstone holder 2 are attached by screwing.
It is fixed by the collar 2'. A circular hole 5 is provided in the side surface around the central axis 1 in the whetstone holder 2, and a container body 6 having a large number of fluid pockets 7 of the same shape around the circumference is fitted and fixed as shown in FIG. A ring-shaped lid 8 is placed on the pocket 7, a hole 9 with a smaller diameter is formed in each pocket, and five buoys 1.9 and 10 are provided inside.

Each pocket 7 rotates about the central axis 1, and a balance fluid injection nozzle 17, which will be explained in detail later, is arranged on the side of the rotation sphere above it.

A pickup 11 of a vibration meter 12, which is an example of vibration measuring means, is attached to the central axis l or the body supporting the central axis. A bandpass filter 13 is connected to the vibration meter 12,
Using this filter, only the vibration is extracted to obtain a vibration signal, and the vibration signal and the position (rotation angle ) is adjusted by a phase adjuster 14, and a pulse generator 15 is driven by an adjustment signal from the phase adjuster.

The adjustment signal is generated by the pulse generator 15 when the unbalanced mass 0-2 comes directly above or near the injection nozzle 17.
is driven to generate a pulse signal, and the length of the pulse can be adjusted arbitrarily. Reference numeral 16 denotes an ultrasonic generator, which is driven by the pulse signal and emits ultrasonic waves.

The balance fluid injection nozzle 17 has a vibration horn 19 that directs the fluid pocket attached to the mounting frame 18, and a piezoelectric element 16-2, which is the ultrasonic generator 16, is applied to the tail end surface of the horn, and the metal 24 is connected with the screws 23 and b. The vibrating horn 19 has a nozzle 20 at the tip and an L-carved liquid hole 2 inside.
1, and a pole valve 22 is inserted at the boundary between the nozzle 20 and the liquid feeding hole 21. A pump 25 is installed in the inlet pipe of the liquid feeding hole 21.
27.

The present invention has the configuration as exemplified above, and in the above embodiment, the central axis l Or if vibration occurs in the aircraft, Vibration A+12 will detect this,
A nearly pure vibration signal whose noise is filtered by the bandpass filter 13 is obtained. On the other hand, the above-mentioned vibration is of a balanced type and is generated when the rotary grindstone 10-2 is offset from the center of rotation of the rotary grindstone 4, and is generated with a frequency proportional to the number of rotations of the central shaft 1. Therefore, an adjustment signal is created by the phase adjuster 14, and the adjustment signal is changed to the pulse generator 15 to drive the generator. The drive timing of the pulse generator 15 is determined by the adjustment signal, and when the unbalanced mass 0-2 rotates and passes through the part separated from the balance fluid injection nozzle 17 and 180', the balancing fluid ejected from the nozzle is Since it takes some time for the weight fluid to reach the fluid pocket 7, when the unbalanced mass passes close to the injection nozzle 17, the phase adjuster 1
The sending period of the adjusting signal is adjusted so that the adjusting signal is sent from 4 to drive the pulse signal generator 15 and the ultrasonic generator 16. Of course, this adjustment is not constant depending on the specifications such as the shaft speed of the middle six shafts 1. In short, the phase adjuster 14 is a vibration meter worth 12 dollars.

The relationship between the vibration signal of the vibration measuring means and the rotation angle of the unbalanced mass is adjusted so that the balancing weight fluid injected from the injection nozzle 17 is inside the fluid pocket 7 that is 180° away from the position of the unbalanced amount Q2. It is something that you adjust to reach that point. The length of the pulse signal generated by the pulse generator 15 can be adjusted. This adjustment and the adjustment of the phase adjuster 14 are correlated.

When a pulse signal is sent from the pulse generator 15 based on the adjustment signal adjusted by the phase adjuster 14, the ultrasonic 'generator 16 is driven by the pulse signal, causing expanded vibration in the vibration horn 19, and causing the pole valve 22 to move. Because it vibrates,
The pressure fluid acting behind the pole valve after delivery is
The balance fluid injection nozzle 1 passes through the outer periphery of the pole valve 22.
Injected from 7, this is unbalanced Q90-2 and 180
When the fluid is injected into the fluid 7 at a position 0 apart or before and after it, a part of it accumulates in the fluid reservoir 10 and corrects the unbalance, and as a result of this correction no vibration signal is sent from the vibration meter 12, the balancing weight The ejection of fluid is paused, and when the fluid is ejected again, the ejection is automatically controlled.

The present invention has the configuration and operation as exemplified above, and since a balancing weight fluid that does not cause any trouble to the grinding work of the grindstone can be selected, the grinding can be easily performed. Unbalance correction is not permanent, but it does produce automatic correction, and the automatic correction can be performed concurrently with the grinding work using a simple device. It has various benefits such as being able to be worn and used.

[Brief explanation of the drawing]

The accompanying drawings show two embodiments of the present invention, in which Fig. 1 is a vertical sectional front view of a part of the main part, Fig. 2 is a side view of the same, and Fig. 317j is an explanatory view. 2 → Grinding wheel holder 7 → Fluid pocket 12 → Vibration/I? +1 constant means engineering 4 → phase adjuster 15 →
Varnu generator 16 → Ultrasonic generator 17 → Balance fluid injection nozzle No. 20 127310 Fig. 3

Claims (1)

[Claims] A plurality of fluid pockets arranged in a ring around the central axis of the rotary whetstone, a balance fluid injection nozzle corresponding to each pocket sequentially as each pocket rotates, a vibration measuring means, and a vibration signal of the measuring means and a vibration signal of the rotary whetstone. Unbalance'e1. It is equipped with a phase adjuster for adjusting the relationship between the rotation angle of the quantity and a pulse generator. An automatic balancer device for a rotary grinding wheel, characterized in that it is configured to inject a balancing way B & body from a nozzle into a fluid blur in the vicinity separated by 180° from an unbalanced mass.