JP2010155305A - Wet blasting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet blasting apparatus achieving a preferable wet blasting procedure. <P>SOLUTION: An air injection part 5 is disposed near a slurry storage chamber 4 where slurry 3 as a mixture of abrasive particles 1 and fluid 2 is loaded and stored. With the injection of compressed air from the air injection part 5, the slurry 3 is unloaded from the slurry storage chamber 4, and the slurry 3 and the air are fed into a mixing chamber 6 and mixed together. The wet blasting apparatus includes a nozzle body 8 injecting an injection material 10 as a mixture of the air and the slurry 3 from a slit-like injection part 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wet blasting apparatus.

  Conventionally, so-called wet blasting, in which a slurry in which abrasive grains and liquid are mixed is pressurized with pressurized air, is sprayed onto a workpiece from an injection port, and the workpiece is inspected for processing such as burr processing and wear testing by the wet blasting. Various proposals have been made on the wet blasting technology for applying the above, and various nozzle bodies for jetting the wet blast well have been proposed.

  By the way, for example, in order to uniformly process the surface of a large workpiece having a width of 600 mm or the like by wet blasting technology, a nozzle body for wet blasting in which the nozzle nozzle has a slit shape having a width of 600 mm or more is prepared. By moving the work relative to the nozzle body, means for processing the entire surface of the work as simultaneously as possible is employed.

  However, it is extremely troublesome to inject wet blast from such slit-shaped injection ports in a uniform mixed state. This is because the wider the injection port, the more easily the abrasive concentration in the slurry varies from place to place.

  Therefore, in a nozzle body having a slit-shaped injection port having a width of 200 mm or more, slurry (abrasive grains and liquid) and air injected from the injection port cannot be in a uniform mixed state. Processing irregularities would occur and there was a problem that precise processing and inspection could not be performed.

  Therefore, the present applicant has proposed a nozzle body (hereinafter, a conventional example) disclosed in Japanese Patent No. 3540713 in order to solve the above-described problems, and this conventional example is stored in a slurry storage chamber. The lead-out passage through which the slurry is led out is provided in a porous structure in which small holes are arranged in parallel, and the air injection passage through which air is led out from the slurry storage chamber passes through the porous structure in which small holes are arranged in parallel. With this configuration, the slurry (abrasive grains and liquid) sprayed from the long slit-shaped spray port and air can be in a uniform mixed state (spray material), which is extremely practical. It is excellent and innovative.

Japanese Patent No. 3540713

  However, even in the above-described conventional example, processing unevenness may still occur.

  This is a structure in which the injection of the injection material in the conventional example is a structure in which the injection material is injected from the injection port after the slurry is drawn and mixed with the pressurized air as described above. This is because even if it is supplied, the flow may not be stable and pulsation may occur.Therefore, the amount of slurry is not constant due to the pulsation of air, and as a result, the mixed state of slurry and air is partially Processing irregularities occur due to the difference.

  Therefore, in the past, in order to prevent this processing unevenness from occurring, attempts have been made to cope with various settings such as appropriately setting the air pressure and the amount of slurry introduced, but these settings are extremely difficult, In reality, the results are not as high as required.

  The present inventor has advanced further research and development on a wet blasting apparatus including a nozzle body that injects the air-and-slurry mixed injection material from the slit-like injection unit. Developed an innovative wet blasting device that demonstrates

  The gist of the present invention will be described with reference to the accompanying drawings.

  An air injection unit 5 is provided in the vicinity of the slurry storage chamber 4 where the slurry 3 in which the abrasive grains 1 and the liquid 2 are mixed is introduced and stored, and pressurized air is injected from the air injection unit 5. As a result, the slurry 3 is led out from the slurry storage chamber 4, the slurry 3 and the air are sent to the mixing chamber 6 and mixed, and the injection material 10 in which the air and the slurry 3 are mixed is injected into the slit shape. A wet blasting apparatus including a nozzle body 8 for injecting from a unit 7, wherein the control of air injection from the air injecting unit 5 is configured to alternately perform injection and stop. The present invention relates to a wet blasting apparatus.

  The wet blasting apparatus according to claim 1, wherein the air injection unit 5 has a porous structure in which a plurality of air injection holes 9 opened in the mixing chamber 6 are arranged side by side, and the control of the air injection is performed in a plurality. When one of the air injection holes 9 is in the injection state, the other air injection hole 9 is in the stopped state, and thereafter, the reverse operation is repeatedly performed. The wet blasting apparatus is characterized in that control is performed so that air injection and stop to the mixing chamber 6 are alternately performed.

  Further, in the wet blasting apparatus according to any one of claims 1 and 2, the control of the air injection communicates with the one air injection hole 9 in a hole forming portion 14 in which the air injection hole 9 is formed. The present invention relates to a wet blasting device characterized in that a movable valve body 11 having a closing portion 11b for closing the communication hole 11a and the other air injection hole 9 is provided.

  The wet blasting device according to any one of claims 1 to 3, wherein the mixing chamber 6 has a length in the slit width direction of the slit-shaped injection unit 7. It relates to a blasting apparatus.

  5. The wet blasting device according to claim 2, wherein the slurry 3 has a predetermined length from the slurry storage chamber 4 when air is injected from the air injection unit 5. The slurry derivation section 12 is a structure that is led out through a section 12, and the slurry derivation section 12 has a porous structure in which a plurality of slurry derivation holes 13 that open to the mixing chamber 6 are arranged side by side. is there.

  The wet blasting apparatus according to claim 5, wherein each of the air injection holes 9 and each of the slurry outlet holes 13 are provided in a corresponding positional relationship.

  Since the present invention is configured as described above, an injection material in which air and slurry are mixed can be injected at a constant pressure from the entire area of the slit-like injection unit, and the occurrence of processing unevenness can be prevented as much as possible. It is an epoch-making wet blasting device that exhibits unprecedented operational effects.

  Embodiments of the present invention considered to be suitable will be briefly described with reference to the drawings.

  When pressurized air is injected from the air injection unit 5, the slurry 3 is led out from the slurry storage chamber 4, and the slurry 3 and air are sent to the mixing chamber 6 and mixed, and the air and the slurry 3 are mixed. The mixed injection material 10 is injected from the slit-like injection unit 7.

  By the way, control of the air injection from the air injection part 5 is comprised so that injection and a stop may be performed alternately, and it can prevent that a process nonuniformity arises from this structure as much as possible.

  That is, when the air injection from the air injection hole 9 to the mixing chamber 6 is stopped by the air injection control described above, the mixing chamber 6 is filled with the slurry 3 (see FIG. 8). When air injection is performed on the mixing chamber 6, the slurry 3 filled in the mixing chamber 6 is injected while the air injection is stopped (see FIG. 9).

  Therefore, unlike the conventional case where pressurized air supplied in an unstable state that pulsates is injected, a certain amount or more of the slurry 3 accumulated in the mixing chamber 6 is always pressurized to a predetermined pressure. Since injection is performed by extruding with air, the injection material 10 in which air and the slurry 3 are mixed can be injected from a whole area of the slit-like injection unit 7 in a constant mixed state, and processing unevenness can be generated. It can be prevented as much as possible. This has been confirmed by experiments conducted by the applicant.

  Further, as in the second aspect of the present invention, the air injection section 5 has a porous structure in which a plurality of air injection holes 9 opened in the mixing chamber 6 are arranged in parallel, and the control of the air injection is performed in a plurality. When one of the air injection holes 9 is in the injection state, the other air injection holes 9 are stopped, and then the reverse operation is repeatedly performed from each air injection hole 9 to the mixing chamber. By alternately performing air injection and stop for 6, it is possible to further prevent the occurrence of machining unevenness as much as possible.

  Specifically, each air injection hole 9 provided in the air injection unit 5 serves as an orifice, and the air injected from the air injection unit 5 is injected in a rectified state, and in a turbulent state Compared with the case of jetting, although the pressure of the air is not so high, the flow velocity of the air is fast and constant, and thus the nozzle body 8 with this structure has very little energy loss of air ( When the pressure of air and the flow rate of the injection material 10 are compared, the flow rate of the injection material is not significantly reduced.) Therefore, the injection material 10 in which air and the slurry 3 are mixed and injected is good also in this respect. Therefore, good machining is performed.

  A specific embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, an air injection unit 5 is provided in the vicinity of a slurry storage chamber 4 in which a slurry 3 in which abrasive grains 1 and a liquid 2 are mixed is introduced and temporarily stored, and the air injection unit 5 is pressurized. When the air is injected, the slurry 3 is led out from the slurry storage chamber 4, the slurry 3 and the air are sent to the mixing chamber 6, and mixed, and the injection material in which the air and the slurry 3 are mixed The wet blasting apparatus includes a nozzle body 8 that ejects 10 from a slit-shaped ejection unit 7.

  Specifically, in the present embodiment, as shown in FIG. 1, a slurry reservoir 32 disposed at a lower position of the processing body 31 for accommodating the workpiece, and the slurry reservoir 32 through the pump device 33. A slurry transport unit 34 that transports slurry into the processing body 31 and a nozzle body 8 that is disposed in the processing body 31 and that serves as a slurry injection unit that sprays the slurry 3 (injection material 10) transported by the slurry transport unit 34. The slurry 3 ejected from the nozzle body 8 is stored in the slurry reservoir 32 below the processing body 31 and reused.

  As shown in FIGS. 1 to 3, the nozzle body 8 is continuously provided in a vertically extending manner with a long member 14 (hole forming portion) that is long in the width direction and short in the front-rear direction, and a lower portion of the long member 14. A long and thin long plate-like member 15 and a block-like fitting member 16 (front body 16A and rear body 16B) connected to the upper portion of the long member 14 in a fitted state. . The long member 14, the plate-like member 15, and the fitted member 16 are made of a material that does not deform as much as possible, for example, a metal material.

  As shown in FIG. 2, a mixing chamber 6 is provided between the lower part of the long member 14 and the upper part of the plate-like member 15, and the long member 14 has an air injection hole 9 that opens into the mixing chamber 6. The air injection part 5 formed by juxtaposing (round hole part) is provided.

  The air injection hole 9 is formed in a long member 14 (hole forming portion) as shown in FIG. 2, and this long member 14 is a through hole 16a provided in the fitted member 16 (rear body 16B). It is connected with.

  A plurality of air injection holes 9 are provided in parallel in the length direction of the long member 14, and one end is connected to the above-described through hole 16 a and the other end is provided to open on one side surface of the long member 14. ing.

  The through hole 16a of the fitted member 16 is provided so that one end thereof is connected to each air injection hole 9 opened on one side surface of the long member 14 described above, and air control to be described later is provided in the through hole 16a. A movable valve body 11 related to the mechanism is disposed.

  Further, the other end of the through hole 16a is connected to an air introduction space 16b opened on the upper surface of the fitted member 16.

  An air supply path 19a extending from the air supply source 19 is connected to the air introduction space 16b.

  In addition, the air injection unit 5 includes an air control mechanism that performs control so that air supply to the mixing chamber 6 from the air injection hole 9 and air supply stop are alternately performed.

  Specifically, as shown in FIGS. 2 to 4, the air control mechanism has a communication hole 11 a that communicates with the one air injection hole 9 in a long member 14 as a hole forming portion in which the air injection hole 9 is formed. And the movable valve body 11 provided with the obstruction | occlusion part 11b which obstruct | occludes the said other air injection hole 9 is provided and comprised.

  The movable valve body 11 is a long plate-like body formed of an appropriate metal member as shown in FIG. 4, and is disposed in the through hole 16 a of the fitting member 16 on the upper surface of the long member 14. Has been.

  The movable valve body 11 has a plurality of communication holes 11a formed at predetermined intervals. The intervals between the communication holes 11a are arranged in parallel with the long member 14 when arranged on the upper surface of the long member 14. It is set so that every other air injection hole 9 matches.

  That is, the side portion of the communication hole 11 a in the movable valve body 11 functions as a closing portion 11 b that closes some of the air injection holes 9.

  Therefore, the air control mechanism is configured such that when one air injection hole 9 opened by the communication hole 11a among the plurality of air injection holes 9 arranged in parallel is in an air injection state, When the air injection hole 9 is in a stopped state of air injection, and then the movable valve body 11 is reciprocated by a drive source 20 described later, the air injection in one air injection hole 9 and the other air injection holes 9 described above is performed. The state and the stop state are reversed, and the movable valve body 11 reciprocates, so that the above-described operation is repeated, and air injection and stop from the air injection holes 9 to the mixing chamber 6 are alternately performed ( It is controlled to switch instantaneously).

  Further, a packing 22 is provided on the upper surface of the long member 14 on which the movable valve body 11 is provided, and holes 22a are formed in the packing 22 at positions that match all the air injection holes 9. .

  Accordingly, the movable valve body 11 is disposed on the upper surface of the long member 14 via the packing 22.

  Further, a long window-like hole 11c is formed at the end of the movable valve body 11, and this hole 11c functions as a connecting portion with a drive source 20 described later.

  As shown in FIGS. 3 and 4, the drive source 20 is configured by installing a motor in an installation portion 21 provided on the side portion of the fitted member 16, and an eccentric shaft body 20a is provided below the drive source 20. Is suspended.

  The eccentric shaft body 20a is configured to be able to be inserted into a hole 11c provided at the end of the movable valve body 11. When the eccentric shaft body 20a rotates eccentrically by operating the drive source 20, the movable valve body 11 The body 11 reciprocates on the long member 14 in a predetermined direction (X direction in FIG. 4).

  The amount of movement of the movable valve body 11 is the distance between the air injection holes 9 provided in the long member 14, that is, when the eccentric shaft body 20a rotates eccentrically, as shown in FIGS. The communication hole 11a provided in the body 11 is set so as to move from a state where it matches with one air injection hole 9 to a state where it matches with another adjacent air injection hole 9.

  Further, the movable valve body 11 may be of the type in which the communication hole 11a is formed in the movable valve body 11 formed in the shape of a rotating shaft as shown in FIGS.

  The air control mechanism is not limited to the control using the movable valve element 11 (valve structure) described above, and an independent air supply source is provided for each of the air injection holes 9 so that any number of air injection holes 9 can be used. An electronic control type that supplies air or stops air supply may be used.

  Further, the long member 14 is provided with a slurry lead-out portion 12 formed by juxtaposing a slurry lead-out hole 13 opened to the mixing chamber 6.

  Specifically, the slurry lead-out portion 12 is constituted by a slurry lead-out hole 13 provided in a penetrating manner in the long member 14 as shown in FIG.

  A plurality of the slurry outlet holes 13 are arranged in parallel in the length direction of the long member 14 (the same number as the air injection holes 9), one end opens into the mixing chamber 6 provided in the long member 14 and the other end. The long members 14 are arranged side by side so as to open on the other side surface.

  Therefore, the slurry lead-out portion 12 has a length in the slit width direction of the slit-like injection portion 7 described later, and a structure in which the slurry lead-out holes 13 are arranged in parallel in the length direction of the slurry lead-out portion 12. Become.

  Each of the slurry outlet holes 13 is set to have a one-to-one correspondence with each of the air injection holes 9. That is, the air injection hole 9 and the slurry outlet hole 13 are provided on the same vertical plane in plan view.

  Further, an opening that opens on the other side surface of the long member 14 in the slurry outlet hole 13 is connected to the slurry storage chamber 4.

  As shown in FIG. 2, the slurry storage chamber 4 is provided inside the fitted member 16 (front body 16A), and the above-described slurry transporting portion 34 is connected to the upper portion of the slurry storage chamber 4. 3 is provided in an open state on the upper surface of the fitted member 16, and a slit-like slurry outlet passage 18 for leading the slurry from the slurry reservoir 4 is provided on the side of the slurry reservoir 4. Is provided in an open state on the inner wall surface of the fitted member 16.

  As shown in FIG. 2, the slurry outlet passage 18 is configured to be in communication with each slurry outlet hole 13 provided in the elongated member 14 when the elongated member 14 is fitted with the fitted member 16. ing.

  In the present embodiment, the opening portions on the mixing chamber 6 side of the air injection holes 9 in the air injection portion 5 described above are positioned in the vicinity of the opening portions on the mixing chamber 6 side of the slurry outlet holes 13 in the slurry outlet portion 12 described above. It is set to be positioned above.

  When air is supplied from the air injection hole 9 to the mixing chamber 6 by this configuration, the mixing chamber 6 side opening of the air injection unit 5 and the mixing chamber 6 side of the slurry outlet 12 are caused by the downward movement of the air. A negative pressure is generated between the openings, so that the slurry 3 is sucked from the opening portion on the mixing chamber 6 side of the slurry outlet portion 12 and led out into the mixing chamber 6. Air is mixed.

  The plate-like member 15 is provided therein with a slit-like passage path 15 a communicating with the mixing chamber 6, and a lower part of the passage path 15 a is opened, and this opening is set in the slit-like injection unit 7. .

  In the present embodiment, a urethane resin protective layer (not shown) is coated on a path through which the slurry 3 passes among the above-described components. This protective layer prevents the passage of the slurry 3 from being polished by the slurry 3 (particularly abrasive grains). The presence of this protective layer extends the life of the nozzle body 8 several times. It has been confirmed.

  The urethane resin is also provided as a seal member at a portion where the long member 14, the plate-like member 15, and the fitted member 16 are in contact with each other.

  Moreover, the structure which does not provide a urethane resin as much as possible is employ | adopted for the path | route through which only air passes. This is because the urethane resin has a large surface frictional resistance, and if the urethane resin is present, the pressure of the pressurized air is lost due to the contact between the urethane resin and the pressurized air.

  Since the present embodiment is configured as described above, it is possible to inject the injection material 10 in which air and the slurry 3 are mixed at a constant pressure from the entire area of the slit-like injection unit 7, thereby causing uneven machining. Can be prevented.

  Further, in the present embodiment, the air injection part 5 has a porous structure in which a plurality of air injection holes 9 opened in the mixing chamber 6 are arranged side by side, so that each air injection hole 9 provided in the air injection part 5 serves as an orifice. Further, the air injected from the air injection unit 5 is injected in a rectified state, and the pressure of the air is not so high as compared with the case of injecting in a turbulent state. The flow velocity of the air becomes fast and constant. Therefore, the nozzle body 8 having this structure has very little energy loss of air (when the pressure of the air and the flow velocity of the spray material are compared, the flow velocity of the spray material 10 is remarkably high). Therefore, the injection material 10 in which air and the slurry 3 are mixed and injected also at this point is well injected onto the workpiece, and good machining is performed.

  Further, in this embodiment, the air injection part 5 has a length in the slit length direction of the slit-like injection part 7, and a plurality of air injection holes 9 are arranged in parallel in the length direction of the air injection part 5. Therefore, as disclosed in Japanese Patent No. 3540713, the slurry 3 (the abrasive grains 1 and the liquid 2) and the air can be sprayed from the spray section 5 in a uniform mixed state.

  Further, in this embodiment, when air is injected from the air injection unit 5, the slurry is derived from the slurry storage chamber 4 through the slurry deriving unit 12 having a predetermined length, and the slurry deriving unit 12 is mixed. Since it has a porous structure in which a plurality of slurry outlet holes 13 opened in the chamber 6 are arranged side by side, as disclosed in Japanese Patent No. 3540713, slurry (abrasive grains and liquid) and air are uniformly mixed from the injection unit 5 Will be able to be injected.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is a schematic explanatory drawing which shows the use condition of a present Example. It is explanatory sectional drawing of the principal part which concerns on a present Example. It is operation | movement explanatory sectional drawing of the principal part which concerns on a present Example. It is a description perspective view of the principal part concerning a present Example. It is operation | movement explanatory drawing of the principal part which concerns on a present Example. It is operation | movement explanatory drawing of the principal part which concerns on a present Example. It is operation | movement explanatory drawing of the principal part which concerns on a present Example. It is operation | movement explanatory sectional drawing of the principal part which concerns on a present Example. It is operation | movement explanatory sectional drawing of the principal part which concerns on a present Example. It is a description perspective view of the principal part concerning another example. It is operation | movement explanatory sectional drawing of the principal part which concerns on another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Abrasive grain 2 Liquid 3 Slurry 4 Slurry storage chamber 5 Air injection part 6 Mixing chamber 7 Injection part 8 Nozzle body 9 Air injection hole
10 propellant
11 Movable valve body
11a communication hole
11b Blocking part
12 Slurry outlet
13 Slurry outlet hole
14 Hole formation part

Claims (6)

  An air injection unit is provided in the vicinity of a slurry storage chamber in which a slurry in which abrasive grains and a liquid are mixed is introduced and stored, and pressurized air is injected from the air injection unit, thereby the slurry storage chamber. The wet blasting apparatus comprising a nozzle body for extracting the slurry from the nozzle, sending the slurry and the air to the mixing chamber and mixing the mixture, and injecting the injection material mixed with the air and the slurry from the slit-like injection unit The wet blasting apparatus is characterized in that the control of air injection from the air injection unit is configured to alternately perform injection and stop.   2. The wet blasting apparatus according to claim 1, wherein the air injection unit has a porous structure in which a plurality of air injection holes opened in the mixing chamber are arranged side by side, and a plurality of the air injections are controlled in parallel. When one of the holes is in an injection state, the other air injection hole is in a stopped state, and thereafter, the reverse operation is repeated, and air is injected into the mixing chamber from each of the air injection holes. A wet blasting device configured to perform control so as to be alternately performed.   3. The wet blasting apparatus according to claim 1, wherein the control of the air injection includes a communication hole that communicates with the one air injection hole in the hole forming portion in which the air injection hole is formed, and the other. A wet blasting apparatus comprising a movable valve body having a closing portion for closing the air injection hole.   4. The wet blasting apparatus according to claim 1, wherein the mixing chamber has a length in a slit width direction of the slit-shaped injection unit. 5.   The wet blasting device according to any one of claims 2 to 4, wherein the slurry is led out from the slurry storage chamber through a slurry lead-out portion having a predetermined length when air is jetted from the air jetting portion. The wet blasting apparatus is characterized in that the slurry derivation portion has a porous structure in which a plurality of slurry derivation holes opened in the mixing chamber are arranged in parallel.   6. The wet blasting apparatus according to claim 5, wherein each of the air injection holes and each of the slurry outlet holes are provided in a corresponding positional relationship.

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