JPH01502248A - Surface heating grinding blasting method and equipment for carrying it out - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Surface heating grinding blasting method and equipment for carrying it out Industrial applications In a broad sense, this invention covers surface abrasive blasting technology, and more specifically KFi surface processing technology. Page regarding thermal grinding blasting method and equipment for carrying out the method This invention is useful for preventing corrosion of metal structures in civil and mechanical engineering, shipbuilding and ship repair. It is effectively used to protect. As a more detailed application of this invention, a large Corrosion products, dirt and aged coatings from the surfaces of metal and concrete structures Removal of the protective coating from freshly dewormed gold III barrels and the appearance of the first bean scale. Includes removal and cleaning of shellfish, old paint and corrosion layers from the hull. .

The invention further relates to the production of construction materials and the construction of concrete and reinforced concrete structures. In repairs, especially for the purpose of creating layers of product and obtaining rough textures and decorative turns. Grinding natural rocks and cleaning buildings and natural rocks for surface restoration When repairing concrete and reinforced concrete structures, It is also used to remove damaged NI from paint film and concrete.

Background of the invention Recent developments in surface processing techniques for metals and hard mineral materials have led to increased efficiency and is aimed at improving the quality of Generally, Shi1tplast additive is used. These are machining, abrasive blasting, heating and hot grinding processing technology.

Mechanical surface finishing with brushes, cutters and scrapers requires manual labor. They are large, inefficient, and costly, resulting in poor quality final products.

Additionally, mechanical surface finishing operations require the use of large and complex machines, which This is usually inefficient and does not provide good surface quality, limiting the range of applications. O that can be done Sheet blasting machine is a steel shaft blast that is accelerated and projected. Although high efficiency and good surface quality can be obtained! ! sloppy and unreliable This requires equipment that requires large amounts of input energy per product produced. This way Unaso f is usually assembled in a factory and used indoors or outdoors for grinding large-sized products. It cannot be adapted for use in

Abrasive blast processing involves blowing abrasive grains onto the surface of the workpiece using a jet of compressed air. It is made by attaching.

This method has been widely used due to the high mobility of plastic processing machines. , and ensures efficiency and quality comparable to previously known methods of this type.

However, all of the above-mentioned methods prevent impurities from the surface, such as grease, acids, It has the inherent disadvantage of not being able to remove alkaline particles, which is why the protective film As a result, the coating lacks reliability.

This drawback is due to surface heat treatment, i.e., the cleaned surface is strengthened by an acetylene torch, etc. It is removed by heating and then cooling. The first drawback of this method However, the surface roughness required for adequate adhesion of the film coating cannot be obtained. This means that it will no longer be possible.

The heating grinding method involves one method involving a mixture of abrasive grains and a gas carrier, and the other involving the combustion of liquid fuel. The use of a high velocity hot jet obtained during the mixing of the two streams with a combustion product carrier of Aiming for something. The material surface is therefore exposed to abrasive grains with high mechanical energy and high Interaction with the hot jet removes grease, acids, and alkali from the surfaces of metal and mineral materials. Corrosive substances containing lucali.

Removes scale, old paint, impurities, and cuts and surfaces natural stone. , and even film coatings on metal surfaces, such as spray metal coatings. A desired surface roughness of 4C% will be obtained to facilitate adhesion.

The heated abrasive processing method increases cleaning efficiency, improves the quality of the polished surface, and also improves the Improves the reliability of coating adhesion to the workpiece surface by eliminating work such as removing scratches. By extending the life of film coatings such as It is bringing fruit.

The surface heating grinding blast processing method and the equipment for carrying out this method are known (e.g. See, eg, 1983 U.S. Pat. No. 4,384,434).

The known method uses a mixed gas stream containing abrasive grains and a gas carrier, such as oxygen, and an oxidizing gas. It includes the supply of a liquid fertiliser, which creates a high temperature stream of raw gaseous raw material during combustion. . This mixed gas stream then mixes with the sintering product stream within the formation zone of such products. The flow rate is low enough to maintain stable combustion of the mixture. child The mixing of these flows creates a high-temperature jet containing the abrasive grains and sintered gases, which accelerates the firing process. speed up

However, this mixed gas stream rapidly decreases once it enters the combustion zone of the liquid fuel. It was speeded up.

The combustion process becomes unstable, and the supply of mixed gas to the combustion zone is even worse. rapidly lowers the temperature of the flow, reducing its effectiveness on the surface to be ground. . Therefore, due to a decrease in the speed of the grinding abrasive grains and a decrease in the mechanical energy of the abrasive grains, the surface The mouth that causes a decrease in processing efficiency The prior art method includes a combustion chamber having a nozzle for ejecting hot gases. It is made into a JL body by a device with a casing. This combustion chamber is a solvent and a cover route with a passage for supplying and growing oxidizing gas, # to the combustion chamber It is surrounded by a tubular element for supplying a mixed gas which communicates with its port. the tube The shaped element is arranged coaxially with the combustion chamber. To stabilize combustion, A sleeve having a dial through hole is attached tightly to the casing. The inner diameter of this sleeve is ft[N'j of the preheating chamber.

The outer wall of the sleeve and the inner wall of the casing constitute an annular passage leading to the oxygen supply path. Ru. This liquid fuel supply path communicates with the interior of the sleeve.

However, the disadvantage of this device is that the liquid fuel and oxidizing gas are carried separately and the combustion chamber Because the mixture is mixed inside the sleeve of the combustion chamber, sufficient mixing prior to combustion is not possible, and this This makes it difficult to start up the equipment and prevents stable combustion of the mixed fuel. be.

This lack of stable combustion is due to insufficient swirling of the Fi mixture. moreover, The equipment is equipped with stress-bearing elements such as firing chambers and nozzles. It is not possible to provide sufficient cooling, which shortens the operating life of the equipment and requires the use of expensive heat-resistant materials. It also has the drawback of being difficult to use.

In this device, stable combustion of mixed fuel in the combustion chamber is achieved by controlling the flow of oxygen and combustion material. It has also been found that effective swirling of the mixture is required only during mixing.

By improving the blended state of the mixed fuel and its stable combustion, the heating grinding surface of the surface can be improved. An attempt to improve the efficiency of last processing was made by Soviet inventor certificate No. 1101538 (Ink, C1, E2] B 7/14. E21B7/18. %Discoveries .

]nvenLors, ]ndusLreal Designs, Trade Thermal grinding blasting disclosed by Marks INlX25.1984) 1i processing method and equipment! This method of anointing uses abrasive grains and compressed air. a mixed gas stream containing a gas carrier under pressure @ an oxidizing gas such as air and diesel fuel or a mixed fuel stream containing a liquid fuel such as kerosene. oxidation The gas and fuel streams are mixed before being sent to the combustion zone to form a mixed stream of combustion gases. @Becomes a fuel mixture generated during Akatsuki. When the mixed gas flow Fi enters the combustion zone, the mixed gas flow Fi High-temperature combustion with a concentration of Kanashi in the direction of the aigas flow and a low moving speed During transportation, it is rapidly decelerated and loses most of its mechanical energy. others Therefore, the acceleration of the C sintering product flow within the combustion zone makes the furnace sintering of the mixed fuel unstable. Mouth In addition to the above method, there is a case in which the combustion chamber with a radial hole and the nozzle are housed coaxially. This combustion chamber is a pair of nozzles. It is equipped with a vortex device placed on the counter surface.The outer surface of this vortex device The combustion chamber has a passageway extending therethrough and communicating with the interior of the combustion chamber. The casing also It has an oxidizing gas supply pipe that is inclined at 30° with respect to the longitudinal axis of the casing and has an fc axis. ing. The oxidation gas supply pipe is located close to the nozzle of the combustion chamber. Ke The inner wall of the combustion chamber and the outer wall of the combustion chamber separate the supply of solvent and oxidizing gas. An annular passage is formed leading to the tube and the swirler. To supply mixed gas The central hole of the swirler is equipped with an annular element, the outlet end face of which is located in the combustion chamber. The area is covered with fire.

During operation of the device, a mixed gas stream is transported through the tubular element to the combustion zone of the combustion chamber. formed within the annular passage, while the oxidizing gas is conveyed to the same area through the radial holes. The mixed liquor is fed through the spiral passage of the swirler. A mass of fuel and oxidizing gas Pre-mixing in the shaped passage and swirling of the flow in the vortex device are suitable for stable combustion. give conditions. In this device, Fi, @Operating conditions of the firing chamber and nozzle F! acid The cooling of the oxidizing gases considerably improves overall equipment operation. Life expectancy is increasing.

One drawback of such devices is that the mixed gas stream loses its mechanical energy and is forced into the combustion chamber. The velocity of the abrasive particles discharged from the nozzle in the high temperature environment tends to decrease, so the efficiency is low. That's low. In addition, this device controls the supply of oxidizing gas through the combustion chamber. The problem is that most of the parts pass through the radial holes, making them unreliable in operation. enters the awakening chamber, and only a portion passes through the swirler and enters the combustion chamber. be. This is due to the formation of a rich mixed fuel and the tip of the flame slipping off the nozzle. If the flameout occurs, the structure mentioned above, which has the opposite effect on the combustion process, will occur. The use of swirlers in combustion chambers allows the majority of the mixed fuel to flow along the periphery of the combustion chamber. Because of this, sufficient swirl of the mixed fuel flow cannot be maintained.

In this invention, in order to thoroughly mix the mixed gas stream and the combustion products, the fired The abrasive grains in the high-temperature jet ensure high processing efficiency while obtaining a high-quality surface. The present invention provides a method for heating, grinding, and blasting surfaces that are accelerated to transonic or supersonic speeds. Another object of this invention is to increase the firing velocity of the abrasive particles. The relationship between basins for the flow of liquid fuels, oxidizing gases and their mixtures is and a combustion chamber and a tubular element for supplying a mixed gas. To provide a surface heating grinding and blasting device which is configured to be mouth in particular The object of the invention described above is to supply a mixed gas stream containing abrasive grains and a gas carrier with an oxidizing gas. a mixed fuel stream containing a liquid fuel, the combustion of the mixed fuel being caused by the combustion of the mixed gas and the Heat-grinding plastic on the surface that generates a high-temperature firing gas flow by mixing the firing product flow. A processing method, wherein the flow of the mixed gas and combustion products has a firing velocity relative to a workpiece surface. The combustion products are heated to form a high temperature two-section jet with a temperature of 250-450"Q. A surface heating grinding blasting method characterized by mixing at the boundary of the flow. mouth achieved by law The mixing of the mixed gas stream and the combustion products increases their mechanical energy to i@ A high-speed jet with the abrasive grains contained in it reaching near or supersonic speed. make it possible to obtain No deceleration of the abrasive grain occurs and no flow of combustion products to the abrasive grain The flow enters the boundary at high speed and is further accelerated by the mechanical energy of the flow. Whetstone When the speed of the grain is 250-450 m/s, the grinding of the surface of metal and hard material is possible. The efficiency is high and the quality of the machined surface is also good. This also means that it is not amenable to heat treatment. Heating, including the processing of hard alloys and rocks such as gabbro, quartzite, and azure. Expand the range of cores of the grinding plastic processing method.

In carrying out this method, the jet moves over the workpiece surface and its axis It is preferable to form an oblique #J angle of 60-80° with the surface, and the direction of movement of the jet changes by an angle of 90±30, the slope 1! ! l varies by an angle of 80-60 It is preferable to

At an inclination angle of 80' or less, most of the mechanical energy of the jet is directed toward the workpiece surface. If the angle of inclination is more than 80, it will not be directed towards the material surface. , most of the mechanical energy of the jet is directed inside the material to be ground. The abrasive grains create deep, uniformly shaped dents on the surface of the material, causing scaling or grinding. Either way, the surface material that has been This will also affect the grinding efficiency.

Furthermore, when changing the machining direction angle of 90±30, the jet inclination angle also changes from 80 to 60. varies within the range.

For example, if the inclination angle of the jet during machining in a certain direction is 60°, the machining method If the direction is changed to 90°, the jet inclination angle hso is more desirable; If the inclination angle during surface machining in the direction is 80, then This against the workpiece surface The movement of the jet then sprays the metal coat onto the surface of the metal structure or part. When cleaning the surface of the part for the purpose of creating a protective film that contains It is particularly advantageous for such grinding to bring the workpiece surface to a desired height of surface roughness. Achieved a surface with an inclination angle at the top (blast), that is, an isotropic surface state. and sufficiently improves surface adhesion for high-quality paint and/or metal coatings. This results in quality and long life.

The object of the invention described above is to provide a heat-grinding plastic processing unit for one surface, which A casing with pipes for supplying fuel and oxidizing gas to the combustion chamber has a swirler in its radial hole and an inlet for the mixed gas flow, and a casing in the combustion chamber. It has a spiral passage that communicates with the piti and makes the mixed fuel flow swirl. 9. and a nozzle for emitting a high-temperature jet, and a burner fixed to the center hole of the swirler. and a tubular element for communicating with the firing chamber and supplying the mixed gas. In addition, according to the present invention, the outlet surface of the tubular element is connected to the combustion chamber. , the nozzle interface is reached, and the walls of the combustion chamber have approximately radial holes. It is located above the swirler and coaxially with the pipe for supplying liquid fuel. The ratio between the cross-sectional area and the exit cross-sectional area of the liquid solvent supply pipe is 2.5-3.0:1 and the vortex flow Thermal polishing of the surface has a ratio of 1:1.3-1.5 to the total flow area of the passages of the vessel. This can also be achieved by cutting and blasting.

Tubular element in the boundary end face of the nozzle of the combustion chamber @on the inlet side of the sintered product stream The arrangement of the outlet end face of the tubular element allows the mixed gas flow and combustion chamber created within the tubular element to Achieved maximum utilization of the mechanical energy of the combustion product stream produced within the chamber. do. The abrasive particles are accelerated to a rapid speed in the tubular element, and their speed is reduced. The mechanical energy of the combustion product stream causes It will be further accelerated. The mixing of these streams results in the combustion production of two abrasive grains and a liquid fuel. A high-speed high-temperature jet containing logistics is obtained.

a pad on the side wall of the combustion chamber above the swirler and for cofeeding liquid fuel; The projected area of the radial hole coaxial with the pipe and the outlet end of the liquid fuel supply pipe. The ratio of the projected area of the surface is 2.5-3.0:1: and the total flow path of the passage of the swirler, The ratio of the shadow area to the mixing area is 1 in the upper part of the vortex chamber in the inner space of the chamber. direct formulation: the supply of fermentation gas through the combustion chamber is easier to control: This is because the reliability of the device increases due to stable combustion of the mixed fertilizer. These advantages are , forming a combustion product stream with an optimal flow ratio of liquid fuel and oxidizing gas as a whole. provide suitable conditions for

Installed in the center hole of the basin.

As a result, the mixed fuel at the bottom of the flow refiner passes through the inside of the combustion chamber and is ignited. In the burning region, swirling of the mixed fuel streams and their further mixing is promoted. Special The arrangement of the passage in the central hole of the vortex device is such that @'#+, which has a high flash point, When using it, it should be refrigerated and remain effective.

Preferably, in this arrangement, the second casing is in contact with the inner wall of the first casing. in an annular passage bordering the outer wall of the chamber, said second casing containing liquid fuel. It has a through radial hole coaxially provided with the axis of the pipe for supplying the material. The ratio of the pipe exit cross-sectional area to the radial hole area is 1:1.5-2.0, and The nozzle has a perforated radial boat in its exit end face.

In another configuration of the heated grinding blasting equipment described above, the Optimum supply of oxidizing gas, sufficient cooling of the nozzle and optimal formulation of mixed fuel can be obtained. Ru. The nozzle is located on the inner wall of the first casing and the wall of the second casing. an outer wall of the second casing having a through port located in the outlet end face of the second casing; It is cooled by the oxidizing gas pressure that enters from the annular passage formed. To supply liquid fuel The outlet end face of the second pipe, the end face of the radial hole provided in the wall of the second casing. The area ratio is 1:1.5-2.0, which is due to the liquid in the mixed fuel. It was obtained experimentally to obtain the optimum ratio between the amount of fuel and the oxidizing gas.

Preferably, the total area of the radial boat is the inner wall of the first casing and the second casing. The cross-sectional area of the annular passage at the boundary with the outer wall of the jig and the ratio of 1: t, o - 1, 2. It will be done.

This ratio is determined by the amount of oxidizing gas supplied to make the mixed fuel and the amount of oxidizing gas supplied to the nozzle and The ratio of the amount of oxidizing gas required for cooling the chamber 't-1lkii! Make it.

Preferably, a combustion chamber provided on the lower wall of the swirler corresponds to nine passages for the mixed gas flow. The ratio of the total area of the radial holes of the chamber to the cross-sectional area of the combustion chamber is 1:1. It is taken as 0-0.75. This is due to the fact that the oxidizing gas passes through the fuel formulation and combustion chamber. This will create more favorable conditions for the supply of further ensure that

Brief description of the drawing Other objects and advantages obtained of the invention provided herein are illustrated in the drawings. Further information becomes clear from the description of FIG. 1 is a diagram showing the concept of the surface heating grinding plastic processing method according to the present invention: FIG. 2 is a longitudinal cross-sectional view of a surface heat-grinded and blast-processed loading according to the present invention; Figure 3 is a sectional view taken along line l-1 in Figure 2; FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2; FIG. 5 is a surface heating according to the present invention. A longitudinal cross-sectional view of a modification of the grinding and blasting device; FIG. 6 is taken along Vl-V in FIG. 7 is a sectional view taken along the line X-II in FIG. 5.

BEST EMBODIMENT OF THE INVENTION Referring to the heat-grinding and blasting method shown in Figure 1, the spray metal corrosion resistant a metal surface 1 to be coated; a mixed gas stream 2 containing abrasive grains and a gas carrier; and a mixture containing acid gas and liquid slag, the combustion of which forms a hot combustion product stream 4. The supply of combined feed stream 3 is shown. mixed gas and kiln product streams 2 and 44d; Acting or mixing within the critical surface of the combustion products stream 4 to form a melancholy binary jet 5. is generated and fired at a firing speed of 350-400”/B to the surface to be ground 1◎ When the ground surface 1 is covered with corrosive dirt or impure oil, Fi, the jet 5 The firing rate is mixed 'IB class (D flow rate decreases) 250-300 rn/si c is decelerated. When machining metal surface 1, the cavity depth is more than 1 m. or when the surface 1 has hard scale, the jet 5 The firing speed is 11, and can be increased to a maximum of 400-450 m/sK.

Surface 1 is generally machined in two intersecting directions, indicated by arrows A and B. this brass The angle between the two directions of the cutting process can be changed within the range of 90±30.

When the surface is blasted in the direction indicated by arrow A, the axis of jet 5 is It forms an inclination -α of 60 to 80 with the cutting surface, and this jet is indicated by arrows a and a'. Make a reciprocating motion as shown.

- When changing to the blasting direction of the corner 90, indicated by arrow B, the jet 5 @ke, it forms an inclination angle α of 80 to 60 with the workpiece surface, and this jet It makes a reciprocating motion as shown by b'.

By applying the above-described technique of this heating grinding blasting method, the surface 1' is This creates a satin micro-relief surface that strengthens the adhesion of the remetal coating.

When processing the surface in the direction indicated by arrow A, the abrasive grains contained within the jet 5, e.g. For example, metal grids, steel or cast iron sheets, river sand, etc. have a certain inclination fpT angle, e.g. For example, it is projected onto the surface at 8o. As a result, the sharpness of the metal surface, the strength of the abrasive grains, and the A depression with a depth corresponding to the speed when the grain collides with the gold IIi work surface is formed on surface 1. can. The gold removed by the abrasive grain is reflected by the abrasive grain when it collides with surface 1. Form a top (blast) with an angle of inclination close to the corner.

The surface relief obtained after machining generally has several alternating depressions and crests (blasts). have The angle of inclination of each apex (blast) is close to the angle of reflection of the abrasive grains colliding with the surface; The formation of new depressions and crests (blasts) usually reaches approximately 60,000 This is done by stress deformation of the indentation and top (blast), and therefore complex micro This becomes the processed surface or ground surface 1' of the black relief, and the spray metal is applied to this processed surface. It is possible to obtain strong adhesion of the tar coating.

Improved adhesion of heat-grinded and blasted metal surfaces provides protection to the surface. Make the coating 2-3 times more durable or resistant to corrosion.

Referring now to FIG. 2, there is provided, for example, a heated grinding blast of a metal surface. The equipment for processing includes pipes 7 for supplying liquid solvents such as gasoline and oxidation A case with a casing 6 having a pipe 8 for supplying a gas, for example compressed air. Ru.

One end of the casing 6 has a tubular element 10 extending for supplying a mixed gas. It has a central hole passing through it and is closed by a cover plate 9. Combustion chamber 1lF It is arranged coaxially within the casing 6, and the nozzle 12 and the penetrating radial redundant 13 (Fig. ), and the annular space or passage 14 is connected to the outer wall of the combustion chamber 11. It is formed between the inner wall of the casing 6 and the inner wall of the casing 6. Nozzle 12#: t, convergence part 15, cylinder It contains a part 16 and a diffusion part 17. This combustion chamber 11 has a cover plate 9 positioned with respect to the casing 6 and the tubular element 10 by It is connected to the dispersion part 17 and joined to the casing 6 by a retaining ring 18. the dawn It has a vortex device 19 fixed to the chat 10, and has a Fi spiral shape on its outer peripheral surface. G1 has a passage 20 (FIG. 4) for turning the mixed gas flow into a vortex.

This passage 20 is 4g! Communicates with baking chamber 11 (Figure 2) and cavity 11jL are doing.

Said vortex device 19jlP! Since it is located inside the baking chamber 11, the cavity A cavity 21 is formed between the end surface and the back surface of the cover plate 9, and this cavity 21 It is limited by the walls of the Vi4FjjE chamber 11. The cavity 21 is 1! Grilled The chamber 1117) communicates with the annular passage 14 by means of a radial hole 22 made therein. and is arranged coaxially with the pipe 7 for supplying two liquid fuels. Said The cross-sectional area of the hole 22 is in the ratio of the exit cross-sectional area of the pipe 7 to 2.5-3.0: On the other hand, the ratio of the area of this hole 22 to the total flow area of the passage 20 of the vortex device 19 is: 1:1.2-1.5. Pipe 8 for supplying oxidizing gas is a nozzle It is fixed to the casing 6 near 12. Tubular element】0 outlet hot water level 2 3H.

@Arranged at the boundary surface 24 of the nozzle 12 on the inlet side of the flow 4 of baked raw materials (Fig. 1) ing.

The metal surface heating grinding blasting equipment f1 according to the present invention operates as follows. .

Gasoline enters the cavity 21 through the pipe 7C (Fig. 2) and the hole 22. pressure Compressed air also enters cavity 21 through pipe 8 and annular passage 14 and hole 22.

Inside cavity 2, gasoline and compressed air are mixed to become a mixed fuel, It flows along the passage 20 (FIG. 4), swirls, and forms a cavity in the combustion chamber 11. Enter l&.

From the annular passage 14 through the radial bore 13 to the cavity II & Upon entry, the compressed air is mixed with the sanctioned flow of the latter mixed fuel. is ignited by a spark plug (not shown), and the interface 24 (first 2) to form a furnace product stream 4 directed to the furnace. Mixed gas flow 2 (Figure 1) is a tubular It is carried along the element 10 to the interface 24 of the nozzle 12. This nozzle boundary In the plane, the streams 'h2 and 4 (Fig. 1) form a high temperature bifurcated jet 5. It is mixed in the cylinder @ 16 (Fig. 2) and accelerated in the diffusion part 17, and the latter It pops out at a speed of 350-400”/S from (Fig. 1).

When using cheaper liquid fuels such as diesel fuel, kerosene, and In order to obtain a fast high-temperature two-component jet 5, a device basically similar to the one described above is used. can be used. However, to improve the operation of the ignition and its equipment In this case, a meandering passage 25 (Fig. 6) is provided in the center hole of the vortex device 19 (Fig. 5). Should. According to this arrangement of the swirler 19, the capacity I of the firing chamber 11 It is easier to prepare the mixed fuel that goes into the IJL (Fig. 5), and the combustion of the mixed fuel is stable. do. Such a variant of the device is further provided with a second casing 26. , this is the ring formed between the inner wall of the first casing 6 and the outer wall of the combustion chamber 11. A penetration located in the passage and coaxial with the pipe 7 for supplying liquid fuel. placed in the radial hole 27 (Fig. 5) and the exit cross section of the nozzle 12 (Fig. 5). It has a plurality of radial boats 28 (FIG. 7). to supply liquid fuel The exit cross-sectional area of the pipe 7 and the cross-sectional area of the radial hole 27 are 1:1.5-2.0. It has become. Total cross-sectional area # of the radial port 28 (Fig. 7): t, first casing Cross-sectional area of the annular passage 29 formed between the inner wall of the ring 6 and the outer wall of the second casing 26 The ratio is 1:1.0-1.2. Radia through combustion chamber 11 The total area of the chamber 13 is the ratio of the cross-sectional area of the chamber 11 and ]:1.0-0.75. It has become.

The second casing 26 is connected to the casing 6 and the combustion chamber by a cover plate 30. positioned in the chamber 11 and extending to the flange 31 of the diffusion section 17 of the nozzle 12. , is fixed to the nozzle 12 within the p casing 6 by a retaining ring 18.

To the above i2f type example provided herein for hot abrasive blasting of metal surfaces, the following It works as described.

Diesel fuel enters the cap through pipe 7 (Figure 5), holes 27 and 22' (i''). Enter Pitai 21. Two routes from the annular passage 29 allow the cavity 29 Compressed air is also introduced into the annular passage 29 from the pipe 8. It is supplied. A portion of the compressed air passes through the annular passage 29 and the radial hole 27. 22, while the other part of the pressure a rush is transferred from the annular passage 29 to the radial combustion chamber] between the outer wall of the second casing 28 and the inner wall of the second casing 26. The liquid flows through the annular passage 33'f, and further through the radial hole 22. cabi In the tee 21, the diesel solvent and compressed air are mixed to form a mixing part. It flows along the passage 25 of the vortex device 19 to form a vortex, and the cap of the combustion chamber 11 is Enter Bittyll&. The compressed air also passes from the annular passage 33 through the radial hole ]3. Also supplied. He then explained the first example of the ritual practice provided here. You can proceed in the same way.

Industrial applicability The method of heating, grinding, and blasting a surface according to the present invention and the apparatus for carrying out the method are , which allows you to: - Removal of corrosive substrates and impurities from large metal and concrete structure surfaces, etc. or of old coatings from the above structure prior to coating a new corrosion-resistant protective coating. Removal Descaling prior to coating with a protective coating during the manufacture of partial metal structures; cleaning of shellfish, old paint and corrosion from one hull; To create a layered build-up of one product to obtain a rough texture and/or an accentuated decorative pattern Grinding of natural rocks - Cleaning of buildings and natural rocks for resurfacing; and - Cement fixing for the repair of structures made of concrete and reinforced concrete. Removal of damaged layers of rum and concrete.

This heating grinding blasting method and apparatus for a metal surface uses conventional shot and/or Compared to sandblasting, it is carried out with an efficiency of 8 to 10 @ and is much better. Achieve high machined surface quality. Another advantage is that compared to conventional blasting, Only 1/30,000 to 1/4 of the abrasive material and 1/8 of the compressed air per load! -Ishi 1/ The key is to consume only 9◇ The method provided here is suitable for spray metal since it can be obtained on surfaces of any roughness. Particularly useful for surface grinding prior to protective coating. For metal coating Other work to be done beforehand, such as degreasing, 7-ospheratizing, blowing. It can also be applied dry.

The method and apparatus according to the invention are suitable for It can also be used to cut and process natural rocks, including metals.

international search report -11111-1PCT15027100013

Claims (1)

[Claims] 1) a mixed gas stream containing abrasive grains and a gas carrier; (2) an oxidizing gas and a supplied liquid fuel; a mixed fuel flow (3) containing the mixed gas, and the combustion of the mixed fuel surface heating to produce a hot combustible gas stream (4) by mixing the product streams (2 and 4); A thermal grinding plastic processing method, comprising: the flow (2) of the mixed gas and combustion products; and 4) a high-temperature double whose firing speed is 250-450 m/s with respect to the surface to be machined (1). The components are mixed at the interface of the combustion products stream (4) to form a jet (5). A surface heating grinding plastic processing method characterized by: 2) In the surface heat-grinding plastic processing method described in claim 1, During the movement of the jet (5) on the machined surface (1), the axis of this jet (5) is aligned with the surface (1). 1), and the jet (5) passes over the processed surface (1). When the moving direction changes at an angle of 90±30°, the slope angle α of the jet (5) is 8 A heating and grinding plastic processing method for the surface, which is characterized by a change in the range of 0-60°. Law. 3) Surface heating grinding and plastic processing equipment that supplies liquid fuel and oxidizing gas A cousing (6) having pipes (7, 8) for The combustion chamber (11) has a radial hole on its side. (13) and a swirler (19) on the inlet side of the mixed gas flow (2), and a combustion chamber (11). ) in order to swirl the mixed fuel flow (3). has a spiral passageway (20 or 25) and emits a high temperature jet (5). A nozzle (12) for heating and a combustion chamber fixed in the central hole of the swirler (19). (11) and a tubular element (10) for communicating with the gas mixture and supplying the mixed gas. furthermore, the outlet face (23) of said tubular element (10) is connected to a combustion chamber. (11) reaches the interface (24) of the nozzle (12) of the combustion chamber (1 1) has a radial hole (22) approximately above said swirler (19) and in the liquid It is coaxial with the pipe (7) for supplying fuel, and the cross-sectional area and body of the hole (22) The outlet cross-sectional area of the fuel supply pipe (7) and the ratio are 2.5-3.0:1 and the vortex device (19 ) has a ratio of 1:1.3-1.5 to the total flow area of the passages (20 or 25); Surface heat grinding plastic processing equipment. 4) In the surface heating grinding plastic processing apparatus according to claim 3, the screw The passage (25) of the spiral swirler (19) is provided in the central hole of the swirler (19). A surface heating grinding plastic processing device characterized by: 5) In the surface heating grinding plastic processing apparatus according to claim 3 or 4. and the second casing (26) is in contact with the inner wall of the first casing (6) and the combustion chamber. The second casing (26) is located within an annular passage bordering the outer wall of the chamber (11). ) is a radial port (28) placed on the exit cross section of the nozzle (12) and a liquid fuel A through radial hole (22) is provided coaxially with the axis of the pipe (7) for supplying the material. ), and the ratio of the exit cross-sectional area of the pipe (7) to the area of the radial hole (22) is 1:1.5-2.0 surface heating grinding plastic processing device . 6) In the surface heating grinding plastic processing apparatus according to claim 5, the front The total area of the radial port (28), the inner wall of the first casing (6) and the second casing The ratio of the cross-sectional area of the annular passageway (29) to the outer wall of the housing (6) is 1:1. A heating plast processing device for a surface, characterized in that the temperature is 0-1.2. 7) Surface heating grinding plus according to any one of claims 3, 5, and 6 In the processing equipment, a passage of the mixed gas flow (2) is placed on the lower wall of the swirler (19). The total area of the radial holes (13) of the correspondingly provided combustion chambers (11) and the combustion The ratio to the cross-sectional area of the firing chamber (11) is 1:1.0-0.75. This is a surface heating grinding plastic processing device.