KR100737950B1 - Apparatus for shooting elastic abrasive material - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an elastic abrasive projecting device that enables to uniformly polish the surface of a product by mechanizing and automating the polishing of a metal product.

To this end, the storage tank for storing the elastic abrasive body; A projection device for projecting the elastic abrasive body onto the metal product; A steam injection device for spraying steam onto the projected elastic abrasive body; A support installed in the lower portion of the projection apparatus to rotate in a state where the metal product is seated; A debris removal device that installs a multi-stage screen net at the bottom of the support to reciprocate, and filters or absorbs and removes debris and moisture attached to the polished elastic abrasive; And a vacuum suction device for sucking the elastic abrasive filtered through the foreign matter removing device and resupplying it to the storage tank.

According to the above configuration, the metal product is polished by automating and mechanizing a series of processes from the supply of the elastic abrasive to the projection, steam injection, foreign material removal and resupply, so that it is always uniform regardless of variables such as product and operator change. There is an effect that can secure a product having a processing surface, and there is also an effect that can smoothly secure the work force due to the relatively easy work characteristics.

Elastic abrasives, projections, steam jets, screen nets, nonwoven fabrics

Description

Apparatus for shooting elastic abrasive material

1 is a front sectional view schematically showing the overall internal structure of the elastic abrasive projection apparatus according to the present invention,

Figure 2 is a lower cross-sectional view of the configuration and operating state of the foreign matter removal apparatus according to the present invention,

Figure 3 is a plan view showing an enlarged configuration of the screen network vibration means according to the present invention.

* Description of Major Symbols in Drawings *

100: main body 120: controller

150: storage tank 200: projection apparatus

210: vane 220: supply pipe

230: valve 240: projection nozzle

300: steam injection unit 310: ultrasonic steam generator

320: steam spray nozzle 400: support

410: fixed frame 412: guide groove

420: rotating plate 422: roller

430: air injection device 500: foreign matter removal device

510a, 510b, 510c, 510d: 1st, 2nd, 3rd, 4th screen

520: support frame 522: roller

530: guide frame 540: cam

550: Follower 552: Wheel

554: compression spring 560: bearing

570: fixed bar 600: inhaler

610: suction nozzle 620: suction hose

W: Metal Products M: Motor

The present invention relates to an elastic abrasive projection apparatus, and more particularly, an elastic abrasive projection apparatus for mechanizing and automating the machining of metal products to uniformly polish the surface of the product and at the same time easily secure the manpower required for polishing. It is about.

In general, shot peening refers to a constant cold working method that improves the surface of a metal by projecting a forced small particle called a shot on the surface of the metal product at high speed.

In other words, if the shot swiftly collides with the metal surface and the kinetic energy of the shot momentarily plastically deforms the surface of the material, the surface layer of the product collided with the shot generates irregularities and forms a thin plastic deformation layer on the surface of the carbon layer. It forms a boundary. This layer acts to maintain the elongated surface layer before stretching, so that the surface is balanced with residual compressive stress and internal tensile stress, extending the fatigue life of the product surface.

There are a wide variety of items such as shot peening, for example, gears of various shapes, shafts with key grooves, bearings with cross-sectional changes, steam or gas turbine parts, landing gear parts of airplanes, drive shafts of helicopter propellers, Applications include blades, compressors and high performance engine parts, pistons, crankshafts, connecting rods, valves and blocks.

As described above, the processing method for polishing the surface of the product, such as shot peening, has conventionally mainly relied on barrel polishing or manual work due to processing characteristics that must be accompanied by precise dimensional maintenance.

However, the above-described conventional processing methods have a problem in that when the processing technician is changed or the situation or the material of the product is changed, inexperienced technicians may not process the surface of the product uniformly, thereby degrading the service life and productability of the product.

In addition, due to the nature of the manual polishing process, there is a problem that it is not easy to secure the necessary manpower is classified as a occupation group avoided by young people.

Moreover, in the case of shot peening in the conventional processing method, when the shot is projected onto the product due to the characteristics of the shot made by force, the metal fine powder falls off from the shot and the product, and the fallen metal fine powder is suspended in the workplace. Inhalation into the worker's respiratory tract, causing occupational illness, such as seriously detrimental to the worker's health.

The present invention has been made to solve the conventional problems as described above, to mechanically and to automate the polishing process for improving the surface of the metal product to uniformly polish the product surface and at the same time to easily secure the manpower required for polishing An elastic abrasive projection apparatus is provided.

It is another object of the present invention to provide an elastic abrasive projecting apparatus which can prevent the floating of powder falling from a metal product during the product polishing process to consider the health of the worker and improve the environment of the workplace.

According to one aspect of the present invention, there is provided a polishing apparatus for improving a surface of a metal product, the apparatus comprising: a storage tank installed at an upper end of a body to store an elastic abrasive body; A projection device for supplying the elastic abrasive body to the projection nozzle installed at the lower end of the storage tank, and projecting the elastic abrasive body at the high speed on the surface of the metal product; A vapor spraying device for spraying steam by using ultrasonic waves on the elastic polishing body projected by the projection device; A support mounted to the lower portion of the projection device to rotate the metal product to be polished in a seated state; A debris removal device that installs a multi-stage screen net at the bottom of the support to reciprocate, and filters or absorbs and removes debris and moisture attached to the polished elastic abrasive; And a vacuum suction device for sucking the elastic abrasive filtered through the foreign matter removing device and resupplying the storage to the storage tank.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention.

1 to 3 illustrate the apparatus for projecting the elastic abrasive body of the present invention, the main body 100, the storage tank 150, the projection apparatus 200, the vapor spraying device 300, and the supporter 400. And a foreign material removing device 500 and a vacuum suction device.

First, the main body 100 includes the storage tank 150, the projection apparatus 200, the steam spraying device 300, the support 400, the foreign matter removing device 500, and the vacuum suction device Before and after the main body 100, the doors 110 are respectively installed on the rear side to configure a plurality of screen nets which will be described later to the outside, and a controller provided with a plurality of switches on a part of the side of the main body 100. Install 120.

Next, the storage tank 150 is installed on the top of the main body 100 to store the elastic abrasive, as shown in Figure 1, the storage tank 150, the top of the storage tank 150 to form an injection hole into which the elastic abrasive can be injected, The storage tank 150 is made of polyethylene material to prevent the stored elastic abrasive body from being attached to the inner side.

Here, a brief description of the elastic abrasive body is made by attaching a plurality of abrasives made of minerals to a polymer elastic body having a high modulus of elasticity, and the polymer elastic body uses an acrylic or amide polymer elastic body having a diameter of 1 to 4 mm, As the abrasive, diamond, alumina, WC, SiC, or the like having a diameter of 4 to 9 μm is used depending on the material of the metal product (W).

Subsequently, the projection apparatus 200 supplies an elastic abrasive body to the projection nozzle 240 installed at the lower end of the storage tank 150 to project the elastic abrasive body at high speed on the surface of the metal product W. M) and the vane 210, the supply pipe 220, the valve 230 and the projection nozzle 240.

To explain, the motor (M) is provided to enable the adjustment of the rotation speed at 50 ~ 500rpm, the vane 210 is rotatably coupled to the shaft of the motor (M), the vane 210 and the storage tank ( The supply pipe 220 is provided between the 150 to supply the elastic abrasive body embedded in the storage tank 150 to the projection nozzle 240.

In the middle of the supply pipe 220, a valve 230 operated by a sensing means such as an optical sensor is mounted to adjust the supply amount of the elastic abrasive body. That is, it is possible to manipulate the opening and closing degree of the valve 230 by applying a signal to the optical sensor through the operation of the operation switch 122 provided in the controller 120.

In addition, the lower end of the vane 210 is provided with a projection nozzle 240 in communication with the supply pipe 220 is configured to enable high-speed projection of the elastic abrasive body supplied through the supply pipe 220 to the surface of the metal product (W). In this case, the supply pipe 220 and the projection nozzle 240 is formed of a polyethylene material is configured so that the elastic abrasive body is not attached.

Next, the steam spraying apparatus 300 sprays steam using ultrasonic waves to the elastic abrasive body projected by the projection apparatus 200, and then, to the ultrasonic steam generating unit 310 and the steam spraying nozzle 320. It is composed.

In detail, an ultrasonic steam generator 310 is installed on a portion of the inner surface of the main body 100 to generate steam by using ultrasonic waves, and the steam generated through the ultrasonic steam generator 310 is used as a metal product ( A vapor spray nozzle 320 is installed at the bottom of the projection nozzle 240 so as to supply water by spraying the elastic abrasive projected onto W).

Subsequently, the support 400 is installed below the projection apparatus 200 so as to rotate in a state where the metal product W to be polished is seated, and the fixing frame 410 and the rotating plate 420 are provided. Is composed of a separation hole 424 of.

In other words, the fixing frame 410 is fixed to the inner surface of the main body 100 positioned below the projection apparatus 200, and guide grooves 412 are formed along the inner center of the fixing frame 410. And, while the rotating plate 420 is installed on the top of the fixed frame 410, a plurality of rollers 422 around the outer surface of the rotating plate 420 to rotate in the state fitted in the guide groove 412 Install.

In addition, a plurality of leaving holes 424 are formed on the upper surface of the rotating plate 420 so that the plurality of elastic abrasives projected for polishing the metal product W can be dropped downward.

In this case, an air spraying device 430 is installed at each of the inner edges of the main body 100 between the support 400 and the projection device 200, and the elastic abrasive is projected onto the metal product W and dropped to the support 400. It is configured to be separated more smoothly through the separation hole 424.

Subsequently, as shown in FIGS. 1 to 3, the foreign matter removing apparatus 500 is installed at the lower end of the support 400 so as to reciprocate the multi-stage screen net, and the foreign matter attached to the polished elastic abrasive body and It serves to filter or absorb and remove moisture, and again to the first, second, third and fourth screen nets 510a, 510b, 510c and 510d, screen net moving means, and screen net vibration means. It is composed.

First, the first screen net 510a is to first absorb the moisture contained in the elastic abrasive body away from the support 400 to separate the metal powder attached during polishing, and the first screen net 510a. Is molded to have a particle size of 10mesh or more.

In addition, the second screen net 510b absorbs the moisture of the elastic abrasive body which is not removed from the first screen net 510a to separate the metal powder attached during polishing, and thus, the second screen net. The net 510b is molded to have a particle size of 10 to 15 mesh.

In addition, the third screen net 510c is to absorb the moisture of the elastic abrasive body which has not been removed from the second screen net 510b to separate the metal powder attached during polishing to the third screen. The network 510c is molded to have a particle size of 20 to 40mesh.

In this case, the first, second, third screen nets (510a, 510b, 510c) is a non-woven fabric material to smoothly absorb the moisture attached to the elastic abrasive body and to prevent damage to the elastic abrasive body by impact during the fall. It is appropriate to mold with.

In addition, the fourth screen net 510d absorbs the moisture of the elastic abrasive body which has not been removed from the third screen net 510c and finally separates the metal powder attached during polishing. 510d is molded to have a particle size of 50 to 60mesh.

At this time, the fourth screen net (510d) is installed so as to be inclined at a predetermined angle in one direction to be configured to collect the elastic abrasives falling on the fourth screen net (510d) in one direction, but molded in a nylon material elastic abrasives It was made to flow smoothly, and prevents the elastic abrasive body from falling through the fourth screen net (510d).

The first, second, third, and fourth screen nets 510a, 510b, 510c, and 510d are further provided with handles 512 at their ends to open the door 110 of the main body 100. The first, second, third, and fourth screen nets 510a, 510b, 510c, and 510d are configured to be easily withdrawn from the inside of the main body 100.

Subsequently, as shown in FIG. 2, the screen moving means serves to guide the transfer of the first, second, third and fourth screen nets 510a, 510b, 510c and 510d. It is composed of a support frame 520, a roller 522, and a guide frame 530.

In other words, the support frame 520 is installed on the inner side of the main body 100 before and after the inside, and the rollers 522 rotatable are spaced apart from each other at predetermined intervals inside the support frame 520. . In addition, the guide frame 530 is installed on both sides of the first, second, third, and fourth screen nets 510a, 510b, 510c, and 510d, and a roller 522 is provided inside the guide frame 530. Sliding transfer by surface contact in one state.

Next, as shown in FIG. 3, the screen network vibrating unit simultaneously generates vibrations caused by driving the cam 540 in the first, second, and third screen networks 510a, 510b, and 510c. 2 and 3 screen meshes 510a, 510b and 510c, respectively, to smoothly drop the lower part of the elastic abrasives to the lower part, and the motor M, the cam 540 and the follower 550 again. ) And a bearing 560 and a fixed bar 570.

In other words, the cam 540 is coupled to the shaft of the motor M so as to be eccentrically rotated, and the follower 550 is mounted to contact the outer peripheral surface of the cam 540 to reciprocate. At this time, the follower 550 is equipped with a wheel 552 at one end thereof, the compression spring 554 is mounted at the other end. In addition, a middle portion of the follower 550 is inserted into the bearing 560 to smoothly guide the follower 550.

In addition, while fixing the fixing bar 570 perpendicular to the other middle portion of the follower 550, the first, second and third screen net (510a) (510b) (510c) on one side of the fixing bar (570) Each of the first, second, and third screen nets 510a, 510b, and 510c may be reciprocated at the same time by fixing the driven bodies 550, respectively.

Meanwhile, as shown in FIG. 1, the vacuum suction device sucks the elastic abrasive body filtered through the foreign substance removing device 500 to resupply the storage tank 150, and the suction nozzle 610 again. And a suction hose 620 and an inhaler 600.

In detail, the suction nozzle 610 is installed along the side surface of the lower end of one side of the fourth screen net 510d to suck the elastic abrasive body collected on one side of the upper end of the fourth screen net 510d, and the suction The suction hose 620 is extended to the outside of the main body 100 at the nozzle 610 end.

In addition, while installing the inhaler 600 on the side of the storage tank 150 to suck the elastic abrasive through the suction hose 620, the storage tank 150 stores the elastic abrasive injected into the inhaler 600 The storage tank 150 and the inhaler 600 are installed in communication with each other so as to be immediately resupplied.

Referring to the operation and effects of the present invention configured as described above in detail.

In order to grind the surface of the metal product (W) through the elastic abrasive projection apparatus of the present invention, the elastic abrasive is first introduced into the storage tank 150 to the projection nozzle 240 through the supply pipe 220. Will be supplied. At this time, the supply pipe 220 is provided with a valve 230 with an optical sensor to adjust the supply amount of the elastic abrasive body.

That is, the command is given to the optical sensor through the operation of the operation switch 122 provided in the controller 120, the optical sensor detecting the command to adjust the opening and closing degree of the valve 230 to adjust the elastic abrasive supply amount Will be.

When a certain amount of elastic abrasive is supplied to the projection nozzle 240 through the above operation, the motor M connected to the vane 210 rotates the vane 210 while adjusting the rotation speed between 50 and 500 rpm according to the user's operation. And, the rotating vane 210 generates a strong wind to project the elastic abrasive body in a lower direction through the projection nozzle 240.

In this way, the projected elastic abrasive is a strong blow to the surface of the product while hitting the metal product (W), before the elastic abrasive body polishes the metal product (W) to the elastic abrasive body vapor injection device 300 A predetermined amount of water is supplied through.

Therefore, the elastic abrasive adsorbs the metal fine powder and powder falling from the metal product W through the polishing process of the metal product W, thereby preventing the metal fine powder from floating in the air during the polishing process, thereby improving the environment of the workplace. It can improve respiratory disease and prevent respiratory diseases and industrial accidents that can be caused by workers.

As such, when the elastic abrasive body is projected onto the metal product W, the polished elastic abrasive body falls on the rotating plate 420 on the upper portion of the support 400, and the release hole 424 formed in the rotating plate 420. Through the bottom).

At this time, the upper edge of the rotating plate 420, a plurality of air spraying device 430 is injected compressed air at a pressure of 1 ~ 2kgf / ㎠, and also the rotating plate 420 is installed to rotate the rotating plate ( 420, the vortex is formed on the top. Therefore, the elastic abrasive body falling on the rotating plate 420 can be more quickly and smoothly escaped through the release hole 424 by forming the vortex through the air injector 430.

On the other hand, the elastic abrasive body passing through the separation hole 424 as described above falls on the first screen net (510a), the first screen net (510a) is formed of a non-woven material, it is attached to the elastic abrasive Absorbs and removes moisture, thereby separating the metal fine powder and powder adsorbed to the elastic abrasive during polishing of the metal product W, thereby separating the elastic abrasive and the metal fine powder from the lower second screen net 510b. Dropped up.

At this time, since the elastic abrasive body dropped on the second screen net 510b as described above is not completely removed, the metal abrasive powder is absorbed and removed from the second screen net 510b at the same time. It is separated and dropped onto the third screen net 510c at the bottom. Also, in the third screen net 510c, as in the second screen net 510b, the moisture of the elastic abrasive body is absorbed and removed once again, and the metal fine powder is separated to separate the fourth screen net 510d. Will be dropped.

Through this action, the elastic abrasive body dropped on the fourth screen net 510d has the fourth screen net 510d installed to be inclined in one direction and is collected at an inclined bottom. The separated metal fine powder and powder Through the fourth screen net 510d is laminated on the bottom surface of the main body 100.

That is, since the fourth screen net 510d is formed of a nylon material having a smooth and small particle size, the elastic abrasive body having a predetermined diameter is smoothly conveyed to be naturally collected in the inclined bottom direction, and the fine powder metal Only powder passes through the fourth screen net 510d and is accumulated at the lower end.

On the other hand, the elastic abrasive body is the first, second, third screen nets (510a, 510b, 510c) to smoothly pass through the first, second, third screen nets (510a, 510b, 510c). Will vibrate simultaneously.

That is, when the cam 540 is rotated by driving the motor M as shown in FIGS. 2 and 3, the cam 540 is eccentrically rotated, and the compression spring 554 is fixed behind the follower 550. The follower 550 in contact with the cam 540 by the wheel 552 is reciprocated forward and backward. In addition, since the driven member 550 is inserted into the bearing 560, the reciprocating transfer is more smoothly and smoothly possible.

In this case, a fixing bar 570 is coupled to the follower 550, and the fixing bar 570 is fixed to the first, second, and third screen nets 510a, 510b, and 510c, respectively. Through reciprocating transfer of 550, the first, second and third screen nets 510a, 510b and 510c can be reciprocated simultaneously.

When the elastic abrasive body is collected on one side of the fourth screen net 510d through the vibrating action of the first, second, and third skin nets, the suction nozzle connected to the vacuum inhaler 600 on one side of the fourth screen net 510d. 610 is mounted, it is possible to move the elastic abrasive to be sucked into the inhaler 600 installed in the storage tank 150 side. Then, the elastic abrasive body moved to the inhaler 600 is supplied back to the storage tank 150 to be used for polishing the metal product (W).

In summary, the elastic abrasive projection apparatus of the present invention is a series of processes from the supply of the elastic abrasive body to the projection, the steam injection, the removal of foreign matters and the resupply, are mostly automated and mechanized. W) By polishing the surface, it is possible to secure a product with a uniform processing surface at all times regardless of the change of the product to be processed and the change of the worker, thereby improving the life and productability of the product.

Moreover, the elastic abrasive projecting apparatus of the present invention can reduce the labor cost by eliminating the skilled workers necessary for the polishing process, as the polishing processing action is mostly automated and mechanized as described above, It is easy to secure.

In addition, when the elastic abrasive projection apparatus of the present invention is used by spraying a slight vapor on the elastic abrasive used to polish the metal product (W), the fine metal which is separated from the metal product (W) during polishing processing By dropping the powder together while the elastic abrasive is adsorbed, it is inherently blocked from supporting the fine metal powder in the workplace.

Therefore, it is possible not only to prevent industrial accidents and occupational diseases that can be caught through the worker's respiratory system, but also to improve the workplace environment more cleanly and neatly.

On the other hand, the present invention has been described in detail only with respect to the specific examples described above it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, it is natural that such variations and modifications belong to the appended claims. .

As described above, the present invention can automate and mechanize a series of processes from supplying an elastic abrasive to projection, steam injection, debris removal and resupply to polish metal products, regardless of product and operator changes. Since it is possible to secure a product having a uniform processing surface, there is an effect that can maximize the lifespan and marketability of the product, and improve the company's recognition.

Furthermore, by the automated and mechanized polishing work of metal products, labor costs of skilled workers for polishing work can be reduced, and the work force can be smoothly secured due to relatively easy work characteristics.

In addition, when spraying a small amount of steam on the elastic abrasive to be used for polishing, the fine abrasive powder, which is separated from the metal product, is dropped while the elastic abrasive adsorbs, thereby causing a fatal industrial accident that can be damaged through the worker's respiratory system. It can also prevent and improve the workplace environment.

Claims (14)

delete In order to improve the surface of the metal product (W), it is installed on the top of the main body 100, the storage tank 150 for storing the elastic abrasive body, and the projection nozzle 240 installed on the lower end of the storage tank 150 By supplying the elastic abrasive body, the projection apparatus 200 for projecting the elastic abrasive body on the surface of the metal product (W) at high speed, and the ultrasonic abrasive to the elastic abrasive body projected by the projection apparatus 200 using ultrasonic waves On the support unit 400 installed below the projection apparatus 200 to rotate the spraying steam spraying device 300, the metal product to be polished (W) in a seated state, and the bottom of the support 400 A multi-stage screen net is installed to reciprocate, and removes or absorbs foreign substances and moisture attached to the polished elastic abrasive body and the foreign matter removing device 500, and the elastic polishing filtered through the foreign material removing device 500 Suction sieve and re-filled into storage tank 150 An elastic abrasive projection apparatus comprising a vacuum suction device for supplying, The projection device 200, A motor M capable of adjusting the rotation speed; A vane 210 connected to the motor M and rotatably installed; A supply pipe 220 provided between the vane 210 and the storage tank 150 to supply an elastic abrasive body; A valve 230 installed in the middle of the supply pipe 220 to control a supply amount of the elastic abrasive body; Elastomeric abrasive projection apparatus, characterized in that consisting of a projection nozzle 240 installed at the bottom of the vane 210 so that the high-speed projection of the elastic abrasive supplied through the supply pipe 220 on the surface of the metal product (W) . The apparatus of claim 2, wherein the storage tank (150), the supply pipe (220), and the projection nozzle (240) are made of polyethylene material to prevent the elastic abrasive body from being attached. According to claim 2, The steam injection device 300 is installed on the inner surface of the main body 100, the ultrasonic steam generating unit 310 for generating steam; It is composed of a steam injection nozzle 320 installed at the bottom of the projection nozzle 240 to spray the steam generated through the ultrasonic steam generator 310 to the elastic abrasive projected toward the metal product (W) An elastic abrasive body projection apparatus. The method of claim 2, wherein the support 400, A fixing frame 410 fixed to an inner surface of the main body 100 positioned below the projection apparatus 200 and forming a guide groove 412 along a center inner circumference thereof; A rotating plate 420 provided with a plurality of rollers 422 around the outer surface of the guide groove 412 so as to rotate in the guide groove 412; An elastic abrasive body comprising a plurality of leaving holes 424 formed on the rotating plate 420 so as to drop the plurality of elastic abrasive bodies projected for polishing the metal product W downward Projection device. The apparatus of claim 2 or 5, wherein a plurality of air spraying devices 430 are disposed on the inner surface of the main body 100 above the support 400 to more smoothly detach the elastic abrasive projected onto the metal product W. ) Is further provided with an elastic abrasive projection apparatus. The debris removal device 500 of claim 2, A first screen net (510a) for absorbing moisture contained in the elastic abrasive body and primarily separating metal powder adhered during polishing; A second screen net (510b) for absorbing moisture of the elastic abrasive body not removed from the first screen net (510a) to secondarily separate the metal powder attached during polishing; A third screen net (510c) for absorbing the moisture of the elastic abrasive body not removed from the second screen net (510b) to separate the metal powder adhered during grinding in three steps; A fourth screen net (510d) for absorbing the moisture of the elastic abrasive body not removed from the third screen net (510c) to finally separate the metal powder attached during polishing, and installing the slant at an angle toward one side; Screen net moving means for guiding the transfer of the first, second, third and fourth screen nets (510a) (510b) (510c) (510d); Vibration caused by driving the cam 540 is simultaneously generated in the first, second, and third screen nets 510a, 510b, and 510c and falls to the first, second, and third screen nets 510a, 510b, and 510c. An elastic abrasive projecting device, characterized in that composed of a screen net vibrating means for smoothly drop each of the elastic abrasives to be lowered. The method of claim 7, wherein the first screen net (510a) is formed to have a particle size of 10 mesh or more, the second screen net (510b) is molded to have a particle size of 10 ~ 15 mesh, the third screen net (510c) is 20 And having a particle size of ˜40 mesh, and the fourth screen net (510d) is molded to have a particle size of 50 to 60 mesh. The method of claim 7 or 8, wherein the first, second, third screen nets (510a, 510b, 510c) is formed of a non-woven fabric to smoothly absorb moisture of the elastic abrasive body and to prevent damage. Elastic abrasive projection apparatus, characterized in that. The apparatus of claim 7 or 8, wherein the fourth screen net (510d) is formed of a nylon material so as to smoothly slide the elastic abrasive body and prevent it from falling downward. The elastic polishing method according to claim 7 or 8, wherein the first, second, third, and fourth screen nets (510a, 510b, 510c, and 510d) are further provided with handles (512) at their ends. Sieve projection device. The method of claim 7, wherein the screen network moving means, Support frames 520 installed at both the front and rear sides of the main body 100; Rollers 522 rotatably spaced apart from each other at a predetermined interval inside the support frame 520; 1, 2, 3, 4 screen net 510a, 510b, 510c, 510d is installed on both sides of the long, but the roller frame 522 in contact with the inner surface consisting of a guide frame 530 for sliding transfer An elastic abrasive body projection apparatus. The method of claim 7, wherein the screen network vibration means, A motor M; A cam 540 coupled to the shaft of the motor M to rotate eccentrically; A follower body 550 having a wheel 552 mounted at one end thereof and a compression spring 554 mounted at the other end thereof so as to be in contact with an outer circumferential surface of the cam 540; A bearing 560 for smoothly guiding and feeding the driven member 550; Fixed to the intermediate portion of the follower 550, the first, second and third screen net 510a, 510b and 510c respectively fixed to the first, second and third screen net in accordance with the transfer of the follower 550 (510a) (510b) (510c) elastic abrasive projection apparatus comprising a fixed bar (570) for reciprocating conveyance at the same time. 3. The suction nozzle of claim 2, wherein the vacuum suction device is configured to suck the elastic abrasive body collected on one side of the lower end of the fourth screen net 510 d in the longitudinal direction of one side of the fourth screen net 510 d. 610 is installed along the side, the suction nozzle 610 is installed at the end of the suction hose 620, the elastic abrasive sucked through the suction hose 620 can be injected into the storage tank 150. Elastic injector projection apparatus characterized in that the inhaler 600 is installed to be connected to the storage tank 150 so that.

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