JP3019892B2 - Vibration polishing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration polishing machine using an air motor as a driving source.

[0002]

2. Description of the Related Art Conventionally, for polishing work such as polishing of a base material of a paint, polishing and finishing of a woodwork product, rusting and dirt removal of a metal product, it is conventionally operated by compressed air using a ball or a turbine blade as a vibration source. A vibration polishing machine was used. In addition, the applicant of the present application has previously devised a vibration polishing machine using an air motor as a drive source having a simple structure and easy repair and replacement of parts (Japanese Utility Model Application Laid-Open No. 60-17944).

[0003] However, in the above-mentioned vibration polishing machines, the torque is small, and when a load is applied to the vibration polishing machine during operation, the number of revolutions rapidly decreases, and the decreased number of revolutions is quickly started. Has the disadvantage that it is difficult to maintain a predetermined torque.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide an air motor that can easily obtain a predetermined torque with a high-speed rotation type as a driving source, so that work can be stably continued even under load. The object of the present invention is to provide a vibration polishing machine that can perform the above.

[0005]

SUMMARY OF THE INVENTION The present invention is a vibration polishing machine having a rotary vibrator driven by an air motor, wherein the air motor has an air chamber into which compressed air is introduced into a rotor fitted on a rotating shaft, An outer peripheral portion of the rotor has an injection hole which opens in a tangential direction, and a plurality of flow holes through which the compressed air is supplied are bored in the rotor in a radial direction from an axial portion. A deformable ball is movably accommodated in the rotor, and an air reservoir is provided at an appropriate position in the rotor so as to flow through both the air chamber and the injection hole.

It is preferable that the rotary shaft of the air motor and the rotary vibrating body are connected via an elastic body. It is preferable that the rotary vibrator and the rotor are formed integrally.

[0007]

The rotational force is generated in the rotor by the reaction force of the compressed air ejected from the injection holes, and the air motor is driven, so that the rotating vibrator rotates at high speed and generates vibration. In the load state, if the rotation speed of the rotor decreases, the centrifugal force on the ball also decreases, so that the deformation amount of the ball decreases, and the flow passage cross-sectional area of the flow hole and the supply amount of the compressed air increase to increase the rotation speed of the rotor. Let it. That is, the number of revolutions and the torque of the rotor increase or decrease according to the presence or absence and the degree of the load of the vibration polishing machine. Therefore, even if the load increases suddenly, the output does not drop sharply and the output is stable and high. Is obtained.

When the load on the vibration polishing machine increases, the number of revolutions of the rotor instantaneously decreases. However, since the large amount of compressed air stored in the air reservoir continues to be ejected from the injection holes of the rotor, the number of revolutions decreases. The speed increases instantly. Therefore,
Even if the load suddenly increases, the output does not suddenly decrease.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view of a vibration polishing machine 10 according to the present invention.
An air motor 30 to be described later is built in the main body casing 12 having a base plate, and a base plate 14 is provided below the casing 12 via a plurality of columns 13 made of a vibration-proof rubber. An abrasive cloth 16 is attached to the lower surface of a pad 15 made of an elastic material attached to the bottom surface.

A cap 19 for supporting a bearing 18 is screwed at the center of the upper portion of the base plate 14, and a rotating vibrator 20 having a disc-shaped lower end is provided in a space formed by the base plate 14 and the cap 19.
It is supported by the bearing 18 and is connected to the rotating shaft 40 of the air motor 30 via the spring joint 22. The rotary vibrator 20 is a well-known rotary vibrator having a hole (or weight) 24 at the periphery.

A valve 26 for opening and closing an air flow passage leading to the compressed air introduction port 11 is provided near the casing 12 and on the compressed air supply side. A short cylindrical air motor chamber 44 is formed at the center bottom of the casing 12 by screwing a cap 42 from below, and the air motor 30 is disposed inside the chamber 44.

The air motor 30 mainly includes the rotating shaft 4
0, and a rotor 50 fitted to the center of the rotating shaft 40. The rotating shaft 40 is vertically supported by bearings 46 and 47.
A compressed air introduction path 48 is provided in the axial direction.

An air chamber 51 to which compressed air is supplied is formed inside the rotor 50, and an injection hole 52 communicating with the air chamber 51 is provided on the outer periphery of the rotor 50.

The air motor 30 is provided with a speed adjusting device to prevent over rotation and maintain an optimum rotation speed. The speed adjusting device according to the present embodiment has a plurality of flow holes 54 radially formed in
4. A ball 5 which movably accommodates a deformable rubber ball 55 and moves in the centrifugal direction depending on the magnitude of centrifugal force.
The rotation speed of the air motor 30 is adjusted by controlling the flow rate of the compressed air flowing in the air chamber 51 using the deformation of the fifth embodiment.

[0015] In addition, as the speed adjusting device,
A so-called butterfly, which is described in Japanese Utility Model Publication No. 35-23885, in which a weight built in a frame directly connected to a rotor is tilted outward by a rotational centrifugal force to control the opening of a governing valve, is a so-called butterfly. It may be of a weight type.

Next, the structure of the rotor 50 will be described with reference to FIGS. The rotor 50 is composed of two members, a concave lower rotor 56 and a convex upper rotor 57. When the rotors 56 and 57 are fitted together, the air chamber 51 is formed in an annular shape. FIG. 2B is a plan view of the lower rotor 56, and FIG. 2A is a side view cut along the line AA in FIG. 2B. FIG. 3A shows the upper rotor 57.
3 (b) is a side view cut along the line BB of FIG. 3 (a).

At the circular upper end of the lower rotor 56, four arc-shaped convex ridges 58 extending from the inner peripheral side to the outer peripheral side of the upper end are formed at point-symmetric positions, and adjacent convex ridges are formed. 58
Each start point and each end point of the competitors are slightly juxtaposed, and a groove 59 is formed therebetween. When the lower rotor 56 and the upper rotor 57 are fitted to each other, the groove 59 becomes the injection hole 52 as shown in FIG. Further, a gap 59a formed on the outer peripheral portion of the ridge 58 and following the groove 59 is formed between the rotors 56 and 57.
In the state in which is fitted, the peripheral edge groove 59b is formed.

The number of the ridges 58 need only be two or more so as to be point-symmetrical, and the length of the ridges 58 should be as long as possible so that a large amount of compressed air described later can be obtained. Good to do. It is advantageous to make the groove 59 as parallel as possible to the tangent line of the outer peripheral surface of the rotor, because the torque of the air motor 30 increases.

A streamlined space is provided outside the air chamber 51 and inside the ridge 58 to form an air reservoir 60. That is, when the two rotors 56 and 57 are fitted together, a substantially trapezoidal air reservoir 60 is formed inside the ridge 58, and a substantially trapezoidal peripheral groove 59b is formed outside. The communicating portion between the air reservoir 60 and the groove 59 has a curved surface so that the compressed air flows smoothly. Further, the number of the air reservoirs 60 does not necessarily have to match the number of the grooves 59, that is, the number of the injection holes 52.

Reference numeral 61 denotes a depressing wall for restricting the movement of the ball 55 in the centrifugal direction. . Reference numeral 62 denotes a strip protruding further on the arc-shaped protruding strip 58 so as to fit the rotors 56 and 57 in close contact with each other.
It is a bush interposed to fit to zero.

On the other hand, as described above, the upper rotor 57
When fitted with the concave lower rotor 56, both rotors 5
6 and 57, an air chamber 51 is formed between the air chamber 51 and the outer end.
Four flow holes 54 communicating with the zero introduction path 48 are formed radially.

Reference numeral 63 denotes a concave groove corresponding to the narrow strip 62.
7 are joined together. Reference numeral 66 denotes an O-ring for sealing between the lower rotor 56 and the upper rotor 57.

Next, the operation of this embodiment will be described. FIG.
When the valve 26 is opened, the compressed air for driving is introduced into the rotor 50 from the introduction path 48 of the rotating shaft 40 through the introduction port 11, and the compressed air is
, Reaches the air chamber 51, further flows through the air reservoir 60, and is ejected from the injection hole 52 into the air motor chamber 44. A rotational force is generated in the rotor 50 by the reaction force of the compressed air, and the air motor 30 is driven.

The rotary vibrator 20 connected to the rotary shaft 40 of the air motor 30 by the spring joint 22
Rotates at a high speed, and the weight of the vibrating body 20 is increased by the weight 24, so that the generated vibration is transmitted to the pad 15 via the cap 19 and the base plate 14.

The compressed air ejected from the injection hole 52 does not immediately inject and diffuse into the air motor chamber 44, but flows out along the peripheral edge groove 59b formed at the front of the injection hole 52. The torque of 50 will be increased. The compressed air jetted into the air motor chamber 44 is discharged from the exhaust hole 45.

When a large centrifugal force acts on the ball 55 accommodated in the flow hole 54 by the rotation of the rotor 50, the ball 55 is urged in the centrifugal direction. Therefore, when the vibration polishing machine 10 has no load or when the load is small,
The ball 55 abuts against the restraining wall 61, and the ball 55 receives the reaction and deforms in a direction perpendicular to the centrifugal direction, thereby narrowing the flow path of the compressed air and reducing the flow rate of the compressed air.

On the other hand, when the load on the vibration polishing machine 10 increases, the rotation speed of the rotor 50 decreases instantaneously,
The kinetic energy of the compressed air remaining downstream of the ball 55 contributes to the rotational force of the rotor 50. Therefore, since a large amount of compressed air stored in the air chamber 51 and the air reservoir 60 continues to be jetted from the injection holes 52, the temporarily reduced rotation speed immediately increases.

When the rotation speed of the rotor 50 decreases, the centrifugal force on the ball 55 also decreases, so that the deformation of the ball 55 decreases, contrary to the case of the non-load state.
The flow path cross-sectional area of the flow hole 54 and the supply amount of the compressed air increase, and the rotation speed of the rotor 50 increases.

As described above, the number of revolutions and the torque of the rotor 50 increase and decrease in accordance with the presence or absence and the degree of the load on the vibration polishing machine 10, so that even if the load suddenly increases, the output may suddenly decrease. And high output can be obtained stably. To stop the operation of the vibration polishing machine 10, the valve 26 may be closed and the supply of the driving compressed air may be stopped.

FIG. 5 is a side view showing a main part of a second embodiment of the vibration polishing machine 10 in a longitudinal section. In FIG. 5, the same members as those in the first embodiment are denoted by the same reference numerals. This second
In the embodiment, the casing 12 serving also as the base plate 15 is used.
The second embodiment differs from the first embodiment in that both the rotor 50 and the rotary vibrating body 20 are accommodated in an air motor chamber 44 composed of a cap and a cap. That is, the rotor 50 and the rotary vibrating body 20 are arranged and fitted to the rotary shaft 40, and the rotary shaft 40 and the rotary vibrating body 20 are directly connected, thereby realizing a simple structure.

FIG. 6 is a side view of a vibration polishing machine 10 according to a third embodiment of the present invention.
It has a compact structure. The difference from the second embodiment is that the lower end of the lower rotor 56 is formed in a flange shape so that the lower rotor 56 has a function as a rotary vibrator, and a hole (or weight) 24 is formed in the lower end of the flange shape. Is formed.

[0032]

According to the first aspect of the present invention, the vibration polishing machine employs a high-speed rotating air motor capable of easily obtaining a predetermined torque, so that even if a load is applied to the rotating shaft of the polishing machine during operation. , Without a sudden drop in speed
The reduced rotation speed can be quickly started, and the polishing operation can be continued efficiently.

Conventionally, the rotation speed of the air motor of this type of vibration polishing machine has been limited to about 20,000 rpm, but in the present invention, high speed rotation of 40,000 to 60,000 rpm is possible.
As a result, there is an excellent effect that a smooth minute vibration can be obtained in combination with the function of the speed adjusting device. Furthermore, since the air motor section can be made of resin, the manufacturing cost is low, and the number of parts constituting the air motor is small, so that the assembling work is easy.

When the load applied to the rotating shaft of the polishing machine increases, the rotational speed of the rotor decreases instantaneously, but the rotational speed is reduced by the energy of the compressed air stored in the air chamber and the air reservoir. Is immediately restored, and a high output can be constantly obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of a vibration polishing machine.

FIG. 2B is a plan view of a lower rotor 56,
FIG. 2A is a side view cut along the line AA of FIG. 2B.

FIG. 3A is a bottom view of an upper rotor 57,
FIG. 3B is a side view cut along the line BB of FIG. 3A.

FIG. 4 is a side view of the rotor 50.

FIG. 5 is a vertical sectional side view showing a main part of a second embodiment of the vibration polishing machine.

FIG. 6 is a vertical sectional side view of a main part showing a third embodiment of the vibration polishing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration grinder 20 Rotary vibrating body 30 Air motor 40 Rotating shaft 50 Rotor 51 Air chamber 52 Injection hole 54 Flow hole 55 Ball 60 Air reservoir

Claims (3)

(57) [Claims] 1. A vibration polishing machine having a rotary vibrator driven by an air motor, wherein the air motor has an air chamber into which compressed air is introduced into a rotor fitted on a rotating shaft, and the air polishing machine has a rotating chamber. The outer peripheral portion has an injection hole that opens in the tangential direction, and the rotor is provided with a plurality of flow holes to which the compressed air is supplied in a radial direction from an axial portion, and can be deformed in the flow hole. and freely accommodates move a ball, the
In both the air chamber and the injection hole at an appropriate position in the rotor
A vibratory polishing machine characterized by having a circulating air reservoir . 2. A rotary shaft of the air motor and the rotary vibration.
The vibration polishing machine according to claim 1, wherein the moving body is connected to the moving body via an elastic body . 3. The rotating vibrator and the rotor are integrated.
The vibration polishing machine according to claim 1, wherein the vibration polishing machine is formed .