JP3036036B2 - Apparatus and method for correcting imbalance of rotating body - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for correcting imbalance of a rotating body with respect to a rotation center axis.

[Summary of the Invention]

The rotating body is supported so that both ends are rotatable with its rotation axis horizontal, and the unbalance is detected by a pickup via a bearing, and based on the detection of such unbalance, the end faces on both sides of the rotating body are respectively provided. The powder is applied by the spray nozzles arranged to face each other, or the corresponding end face of the rotating body is scraped off by the solid-gas two-phase mixed powder stream sprayed from the nozzle, thereby preventing the rotating body from being damaged. The balance is corrected.

[Conventional technology]

The weight of the weight and the volume of the container and the mold, which are the reference for measurement, require precision, and the correction of the weight and volume when determining the design of a consumer product or the like is important. For example, when deciding the design of a consumer product, a prototype outer casing is made, and the weight, weight balance, external appearance shape, etc. are examined.In the prior art, a weight such as clay is put into the prototype outer casing to determine the design. It is common to use a tool to scrape or polish a prototype outer casing in terms of both weight and weight and volume, and to add an object using an adhesive. Similarly, when removing unnecessary portions of the mold, use a tool to scrape, polish, or when filling up the surface, cut out the repaired part and accurately correct the corrected part of the mold there. It requires troublesome work such as fitting into a work.

Unbalanced objects, in particular, the balance of a rotating body, are blurred if the balance is out of balance, causing some inconvenient phenomena. For this reason, various correction methods and devices have been proposed and used.

For example, the unbalance of an unbalanced object has been removed by a balancing operation following the measurement.
Generally, for example, in the case of a rotary drum used in a video tape recorder, it is a conventional technique to add a weight to a light portion of the rotary drum or to cut off a heavy portion of the rotary drum.

Therefore, a current correction method of the unbalance of the object having the unbalance will be briefly described.

I. Correction in the direction opposite to the unbalance direction Correction method for adding weight 1.Welding When performing balancing by welding, the width and thickness of the plate-shaped welding piece are fixed, and the length of the plate is adjusted according to the amount of unbalance. Adjust.

For example, it is used for clutch covers for automobiles, propeller shafts for automobiles, and the like.

〔Disadvantage〕

 1) It takes time for welding.

2) There is an angle error.

3) A quantity error and a radius error also occur.

2. Soldering For example, there is a method of balancing by soldering, such as an armature of a small motor. The weight of the solder is determined and corrected according to the unbalanced amount. Although a plate-like or thread-like solder is used, solder pieces cut to various lengths are prepared according to the amount of unbalance, and the solder is balanced with the length of the solder corresponding to the unbalance.

〔Disadvantage〕

Since solder is used, the work is troublesome and it is difficult to achieve high accuracy.

3. Riveting Rivets are sometimes used as counterweights. In general, this method can correct more accurately than soldering. For this purpose, it is necessary to make rivet holes in advance on the rotary drum, for example. The number of rivet holes is three or four in the circumferential direction, and when three holes are used, a 120 ° component force correction method is used, and when four holes are used, a 90 ° component force correction method is used. It is also used for correction of fans, impellers, clutch plates, etc.

〔Disadvantage〕

1) Although it is better than other methods, since several holes are formed, the balance may be broken by the holes for balancing.

2) The number of holes to be drilled is limited by the shape of the balancing surface.

3) Since the component force correction method is generally used, there is a difficulty in imbalance correction requiring high accuracy. In addition, when the two-plane correction method is used, if the thickness (wall thickness) of the balance surface is small, interference occurs in the two-sided correction, so that it takes time to perform the correction, leaving a problem in accuracy.

4. Screw fastening This is a method in which screw holes are provided at equal intervals on the circumference of a fixed radius of the rotary drum, and screws having different lengths according to the unbalance amount are screwed in to correct.

〔Disadvantage〕

1) Since the screw is generally mounted in the axial direction, the mounting place is limited.

2) When the thickness and thickness of the mounting surface are thin, the unbalance interferes with both-side correction.

3) If mounted in the radial direction, it may loosen or fly during rotation, which is dangerous.

5. Dedicated correction weight For example, in the armature of a small commutator motor, a copper square bar with a length corresponding to the unbalance of the slot is inserted and swaged. For automobile tires, a special lead weight is attached to the rim of the hub. The VTR rotary drum uses an ultraviolet-curable adhesive.

〔Disadvantage〕

 1) An angle error or the like occurs.

2) Location is restricted.

3) Installation takes time.

II. Method of removing weight from unbalanced direction 1. Drilling Drilling a hole in a rotary drum and processing it to remove the unbalance is generally widely used. Generally, the drilling is usually performed while the diameter of the drill is kept constant and the drilling depth is changed according to the unbalance amount.

〔Disadvantage〕

1) At the time of correction, if a too deep hole is made, a correction error occurs.

2) An unbalance amount occurs due to an error in depth.

3) It takes time and effort.

2. Boring This is the center correction method when the unbalance amount is extremely large with a large reduction gear.

〔Disadvantage〕

 Not accurate.

3. Grinding Correction method for rotary drums, fans, etc. with smooth surfaces [Defects] 1) It is difficult to accurately determine the angular position and amount of correction.

2) Low work efficiency.

3) There are many repetitions of correction and measurement, which is difficult.

4. Tugane fishing [Defects] 1) As with grinding, it is difficult to make accurate corrections.

2) When a rotor is used, the surface of the rotary drum is roughened, so that the final finish needs to be ground.

[Problems to be solved by the invention]

As described above, in the related art, it is difficult to obtain the accuracy of correction, and there are cases where the location is restricted or skill is required,
There were drawbacks, such as being troublesome.

Therefore, it is not only possible to perform the correction in a short time without skill, but also to perform a highly accurate correction and a minute correction.

[Means for solving the problem]

The present invention supports both ends of a rotating shaft that is mounted so that the axis of rotation of the rotating body is substantially coincident with the axis, and provides an unbalanced amount when the rotating body rotates, and a rotating body having an unbalanced amount. The direction is detected by the detecting means, and the powder and the gas are mixed by the solid-gas two-phase mixed powder flow generating device to generate a solid-gas two-phase mixed powder flow. The solid-gas two-phase mixed powder stream is jetted from an injection nozzle provided at least to one end face of the rotating body toward an end face of the rotating body, so that the powder adheres to the rotating body and the solid-gas 2 The present invention relates to an apparatus for correcting imbalance of a rotating body and a method of correcting the amount of unbalance during rotation of the rotating body by selecting one of the shavings of the rotating body by a phase mixture powder flow. .

[Action]

Accordingly, the solid-gas two-phase mixed powder stream generated by the solid-gas two-phase mixed powder stream generating device is ejected by the injection nozzle while the rotating body is supported via the portions on both sides of the rotating shaft, whereby the rotating body is rotated. By imposing powder or scraping off the rotating body, the imbalance of the rotating body is corrected.

〔Example〕

Hereinafter, as an embodiment of the present invention, a correction method and a device for correcting a weight imbalance will be described, and the technical idea of the present invention will be described with reference to the drawings. This embodiment shows the configuration of a horizontal two-sided balance tester.

In the figure, the reference numerals with the suffixes a and b are:
Since the powder injection systems have the same function, only the powder injection system with the reference numeral with the suffix a will be described. In the present embodiment, a rotary drum used in a video tape recorder has been exemplified as an object having a weight imbalance.

First, the configuration of the balance tester will be described. Since this is the same as the conventional one, the drawings and description have been simplified.

Reference numeral 1 denotes a rotating shaft, on which a rotary drum 2 having an imbalance in weight is fastened, and supported by the V-shaped grooves of bearings 3 and 4 having V-shaped grooves. The bearings 3 and 4 are supported by specimen support springs 5 and 6,
The bearing vibration table (not shown) is supported by a support frame (not shown) via springs 5 and 6 and can vibrate in only one direction. And 8 convert it to an electrical output.
These pick-up outputs enter a measuring circuit, where they are directed via a circuit regulator to an angle and an imbalance indicator. Reference numeral 12 denotes a driven pulley, which is attached to the rotating shaft 1 and interlocks with a driving pulley 13 via a belt 14,
Pulley 13 is attached to electric motor 15. Reference numeral 16 denotes the rotation direction of the rotating shaft 1.

In this way, the amount and angle of the unbalance are measured. In the present invention, the problem is a method and an apparatus for correcting the unbalance.

Next, a method and a device for correcting the unbalance amount will be described.

First, injection nozzles 17a and 17b for injecting a solid-gas two-phase mixed jet containing powder are arranged facing the balance correction surfaces (correction positions and correction radii) 10 and 11 of the rotary drum 2. As the high-pressure gas source 18a, for example, a source of several kg / cm ² or more such as air and dry nitrogen is used. The high-pressure gas source 18a is connected to the high-pressure gas pipe 19a,
a and 21a, and then connected to high-pressure gas pipes 22a and 23a, respectively, and further they are
a and 25a. 26a and 27a are powder supply pipes, respectively, which are also connected to the stirring tanks 24a and 25a, respectively. The high-pressure gas supplied from the high-pressure gas pipes 22a and 23a is supplied to the powder supply pipes in the stirring tanks 24a and 25a.
The powders supplied from 26a and 27a are mixed and stirred to generate a solid-gas two-phase mixed powder stream.

Here, in this embodiment, the stirring tank 24a is a device for generating a solid-gas two-phase mixed powder flow as a device for applying a correction weight for the unbalance amount, and the stirring tank 25a is a device for removing the unbalanced weight. This is an apparatus for generating a solid-gas two-phase mixed powder stream.

The solid-gas two-phase mixed powder flows from the stirring tanks 24a and 25a are guided to supply pipes 32a and 33a through supply pipes 28a and 29a and adjustment on-off valves 30a and 31a, respectively.

The other high-pressure gas pipe 34a coming out of the high-pressure gas source 18a is connected to a high-pressure gas pipe via a high-pressure gas regulating valve 35a.
36a, and supply pipes 32a and 33 at connecting portions 37a and 38a.
Connected to a respectively. The connecting portions 37a and 38a may be connected in the form of a suction nozzle. These connections 37a and 38a
Is supplied to the injection nozzle 17a through a downstream supply pipe 39a and accelerated by the high-pressure gas from the high-pressure gas pipe 36a to be supplied to the injection nozzle 17a. Is ejected to the correction surface 10 of the rotary drum 2 to attach or remove a correction weight of an unbalanced amount.

Next, the operation will be described. As an unbalance test method,
The operation of a method and a device for measuring the unbalance amount and the angle and correcting the angle will be described based on the two-surface simultaneous measurement method.

First, the high-pressure gas from the high-pressure gas source 18a is supplied from the high-pressure gas pipe 19a to the stirring tanks 24a and 25a via the high-pressure gas regulating valves 20a and 21a and the high-pressure gas pipes 22a and 23a, respectively. The powder supplied from the tubes 26a and 27 is stirred and dispersed to generate a solid-gas two-phase mixed powder stream. The solid-gas two-phase mixed powder flows from the supply pipes 28a and 29a to the supply pipes 32a and 33a through the regulating on-off valves 30a and 31a, and further connects to the connection parts 37a and 38a in the form of, for example, suction nozzles.
Flows to

On the other hand, the high-pressure gas flowing from the high-pressure gas source 18a to the high-pressure gas pipe 36a through the high-pressure gas pipe 34a and the high-pressure gas regulating valve 35a is supplied to the connection portions 37a and 38a, and supplied to the supply pipes 32a and 33a.
From the solid-gas two-phase mixed powder stream from
A phase-mixed jet is supplied to the jet nozzle 17a through the supply pipe 39a, and jetted at high speed to the balance correction surface 10 of the rotary drum 2.

The present invention is significantly different from the current technology, in that the correction weight of the imbalance amount can be freely attached and removed by the powder injected at high speed from the injection nozzle 17a, and the correction method can be removed. It is a device for the purpose.

 Therefore, the operation of the correction method and device will be described.

First, a device (stirring tank) for applying a correction weight to an object 24
a is 1 μm of, for example, Al ₂ O ₃ , SiC, etc.
Supply less than powder. Powders called fine powders, ultrafine powders or ultra-fine powders are used.

On the other hand, a powder (for example, Al ₂ O ₃ , SiC, or the like) of about 1 μm or more is supplied from a powder supply pipe 27a to a device (agitating tank) 25a for removing unnecessary weight from the object, that is, for removing the correction weight. Here, a powder called an ultrafine powder, a fine powder, or a granule is used.

 Here, "powder" refers to granules: about 40 to several hundreds of micron fine powder: around several tens to three micrometer Ultra fine powder: around three to three micrometer Ultra-fine powder: 0.3 to 0.001 micrometer Including the particle size of

Next, a method of applying a correction weight using the above-described device will be described. First, the high-pressure gas regulating valves 35a and 20a and the regulating on-off valve 30a are opened, and the high-pressure gas regulating valve 21a and the regulating on-off valve 31a are closed. In this way, when a high-pressure gas is flowed from the high-pressure gas source 18a to the stirring tank 24a and the powder having a particle size of about 1 μm or less from the powder supply pipe 26a is uniformly stirred, a solid-gas two-phase mixed powder flow is obtained. Is sent to the connection portion through the adjustment on-off valve 30a and the supply pipe 32a. The high-pressure gas is supplied to the connection part 37a via the other high-pressure gas pipe 34a and the high-pressure gas regulating valve 35a.
Then, the solid-gas two-phase mixed powder stream is sucked from the supply pipe 32a, and the solid-gas two-phase mixed jet is jetted from the injection nozzle 17a at high speed through the supply pipe 39a at high speed. The powder is impact-fixed 40a by the unbalance correction amount adjusted by the adjustment on-off valve 30a. That is, the powder enters the surface 10 of the object 2 to be corrected by the impact force, and the next powder collides with the powder to generate frictional heat. It is attached 40a. The conditions for impact deposition of the powder are determined by adjusting the pressure of the high-pressure gas at the high-pressure gas adjusting valve 35a, the material and particle size of the powder, the surface material of the object to be corrected, and the like. Although the material and the particle size of the powder are described above, the rotary drum 2 used in this embodiment is
Is made of Al, brass, or the like, and the material of the object to be corrected may be any material other than rubber in general. The pressure of the solid-gas two-phase mixed jet was 1-3 kg / cm ² .

Next, a method of removing the correction weight will be described. The high-pressure gas regulating valves 35a and 21a and the regulating on-off valve 31a are opened, and the high-pressure gas regulating valve 20a and the regulating on-off valve 30a are closed. Then, similarly, powder having a particle diameter of 1 μm or more is supplied from the powder supply pipe 27a to the stirring tank 2.
5a, the powder is uniformly stirred by the high-pressure gas from the high-pressure gas source 18a, and the generated solid-gas two-phase mixed powder flow is supplied to the connecting portion 38a through the regulating on-off valve 31a and the supply pipe 33a. On the other hand, the high-pressure gas from the high-pressure gas source 18a is supplied to the connection part 38a via the high-pressure gas pipe 34a and the high-pressure gas regulating valve 35a. Then, the solid-gas two-phase mixed powder flow is sucked from the supply pipe 33a, and the solid-gas two-phase mixed jet is jetted from the injection nozzle 17a at high speed through the supply pipe 39a at high speed. The correction weight is removed by the unbalance correction amount adjusted by the adjustment on-off valve 31a.

As is apparent from the above description, in the present embodiment, the solid-gas two-phase mixed powder flows from the stirring tanks 24a and 25a are opened and closed as needed by the same injection nozzle 17a by the regulating on-off valves 30a and 31a. Thereby, the high-pressure gas from the high-pressure gas source 18a can be supplied as a solid-gas two-phase mixed jet,
The attachment and removal of the correction weight, which is not available in the prior art, can be performed continuously as needed. Similarly, the operation and operation of the powder injection system composed of various devices indicated by the suffix “b” shown on the left side of the drawing are the same.

Therefore, according to the apparatus of the present embodiment, when there are two surfaces that need to be balanced for an unbalanced object,
With the injection nozzles 17a and 17b, the balance correction surface 10 of the object 2 and
11, that is, the two-phase solid-gas jet is jetted onto the two surfaces, and the correction weight can be alternately attached and removed continuously from the two surfaces while monitoring with the measuring circuit 9. The work can be performed precisely and with high efficiency.

In the present embodiment, a rotating body such as a rotary drum for a VTR is described as the unbalanced object 2. However, the apparatus according to the present embodiment is suitable for such unbalance correction of the rotating body, By appropriately changing the position of the nozzle 17a or 17b, correction can be made freely and finely. In particular, when it is necessary to correct imbalance from both surfaces of the rotary object 2 such as a rotary drum, the injection nozzles 17a and 17b are provided on the balance correction surfaces 10 and 11 of the rotary drum 2 with the same diameter and the same rotational phase. , The correction can be made with good balance, finely and efficiently.

In the present embodiment, a rotating object such as a rotary drum is exemplified.However, the unbalanced object may not be a rotating object, for example, a balance rod of a scale, a reference weight, a weight of a precious metal, or the like. For static objects that require precise weight, those that need to be balanced, and examples of volume adjustments that can be applied to correction of molds, prototype housings, reference containers, etc. Will be easily understood. In short, a solid-gas two-phase mixed jet is sprayed on the surface of an object with an improper weight and volume to adhere the powder or to scrape off the surface of the object so that the object has the proper weight and volume. To be corrected.

The high-pressure gas source used in the powder injection system of this embodiment is provided separately, one is configured to supply high-pressure gas to the high-pressure gas pipe 19a, and the other is configured to supply high-pressure gas to the high-pressure gas pipe 34a. Is also good. However, when the gas pressure is adjusted by the high-pressure gas regulating valves 20a, 21a, and 35a in common as in the high-pressure gas source 18a of the present embodiment, the entire apparatus can be made compact, and operation and maintenance can be performed. Easy to do. Further, there is an advantage that the entire apparatus can be manufactured at a low cost.

〔The invention's effect〕

The invention of the present application supports both ends of a rotating shaft that is attached so that the axis of rotation of the rotating body is substantially coincident with the axis thereof. Direction is detected by the detecting means, and based on the detected value, a solid-gas two-phase mixed powder stream formed by mixing the powder and the gas is jetted to at least one end face of the rotating body by the jet nozzle, and the rotation is performed. Any one of adhesion of powder to the body and shaving of the rotating body by the solid-gas two-phase mixed powder flow is selected and performed to correct the amount of unbalance during rotation of the rotating body. is there.

Therefore, according to the present invention, it is possible to perform both the application of the powder to the rotating body and the scraping of the rotating body by using the same apparatus. In this case, by arranging the injection nozzles so as to be opposed to both end surfaces of the rotating body, both end surfaces can be corrected at the same time, so that not only work efficiency is improved but also highly accurate correction is performed. It is possible to do. In addition, it is not necessary to cut a screw or make a hole in the rotating body to correct the imbalance of the rotating body. Further, the entire apparatus can be made compact, and operation and maintenance can be simplified.
In addition, it has many advantages such as making the whole apparatus inexpensive, and is very useful in practice.

[Brief description of the drawings]

The figure shows an apparatus for correcting the weight and volume of an object according to an embodiment of the present invention. (Explanation of reference numerals) 1 ... Rotating shaft 2 ... Object (rotary drum) 3,4 ... Bearing 5,6 ... Test specimen supporting spring 7,8 ... Pickup 9 ... Measurement circuit 10,11 ... Balance Correction surface 12 Driven pulley 13 Drive pulley 14 Belt 15 Electric motor 17a, 17b Injection nozzle 18a, 18b High-pressure gas source 20a, 20b High-pressure gas regulating valve 21a, 21b … High pressure gas regulating valves 19a, 19b… High pressure gas pipes 22a, 22b… High pressure gas pipes 23a, 23b… High pressure gas pipes 34a, 34b… High pressure gas pipes 36a, 36b… High pressure gas pipes 24a, 24b, 25a, 25b ... stirring tanks 26a, 26b, 27a, 27b ... powder supply pipes 28a, 28b ... supply pipes 29a, 29b ... supply pipes 32a, 32b ... supply pipes 33a, 33b ... supply pipes 39a, 39b Supply pipe 30a, 30b, 31a, 31b Adjustment on-off valve 35a, 35b High-pressure gas adjustment valve 37a, 37b, 38a, 38b Connection

Claims (4)

(57) [Claims] An end of a rotating shaft mounted so that an axis of the rotating body substantially coincides with an axis of the rotating body is supported, and the unbalance amount when the rotating body rotates and the unbalance amount exist. Detecting means for detecting the direction of the rotating body; an injection nozzle provided to face at least one end face of the rotating body; generating a solid-gas two-phase mixed powder flow by mixing powder and gas A solid-gas two-phase mixed powder flow generating device, and the solid-gas 2 generated by the solid-gas two-phase mixed powder flow generating device.
A high-pressure gas source for injecting a phase-mixed powder stream from the injection nozzle, and injecting the solid-gas two-phase mixed powder stream from the injection nozzle based on a detection value from the detection means, Selecting any one of the adhesion of the powder and the scraping of the rotating body by the solid-gas two-phase mixed powder flow, and correcting an unbalance amount at the time of rotation of the rotating body. Unbalance correction device for rotating body. 2. A pair of said injection nozzles are provided, and each of said injection nozzles is arranged on an axis parallel to said rotation center axis and opposed to both end faces orthogonal to a rotation center axis of said rotating body. 2. The apparatus for correcting imbalance of a rotating body according to claim 1, wherein 3. An end of a rotating shaft mounted so that the axis of rotation of the rotating body is substantially coincident with an axis of the rotating body. The unbalanced amount when the rotating body rotates and the unbalanced amount are present. Detecting the direction of the rotating body, and, based on the detected value, injecting a solid-gas two-phase mixed powder stream formed by mixing powder and gas onto at least one end face of the rotating body; Selecting one of adhesion of the powder to a body and shaving of the rotating body by the solid-gas two-phase mixed powder flow, and correcting an imbalance amount during rotation of the rotating body. A method for correcting imbalance of a rotating body, characterized in that: 4. The solid-gas two-phase mixed powder flow is jetted onto both end faces orthogonal to a rotation center axis of the rotating body, and the powder is adhered to the rotating body and the solid-gas two-phase mixed powder is sprayed. The method according to claim 3, wherein any one of the shavings of the rotating body by the flow is selected and performed for each end face, and an unbalance amount at the time of rotation of the rotating body is corrected. Balance correction method.