JP2007098285A - Powder sprayer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder sprayer capable of spraying a powder material to overlie the top surface of a substrate to be conveyed to be uniformly and thickly. <P>SOLUTION: The powder sprayer is provided with a hopper 2 to be fed with the powder material 1, a rotary feeder 3 installed in the hopper 2 and allowing the powder material 1 in the hopper 2 to drop to the lower side by rotatingly driving, a belt feeder 4 receiving the powder material 1 dropping from the hopper 2 and conveying it, a controller for an amount of a conveyed material 5 arranged above the belt feeder 4 with the gap and controlling the amount of the powder material 1 conveyed by passing through the gap, and a scraping rotor 6 scraping away the powder material 1 to the lower side and spraying it by rotatingly driving while coming in contact with the powder material 1 conveyed up to the downstream end part of the belt feeder 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a powder spraying device for spraying and laminating a powder material, and more particularly to a device suitable for laminating a powder material on a top surface of a continuously transported substrate.

  Conventionally, inorganic molded plates formed from cement-based molding materials have been widely used in building exterior materials and decorative panels. In such cases, the surface is colored to improve weather resistance and appearance. Often forms a coated film. Such a coating film may be peeled off after many years of use. In this case, it is necessary to recoat the surface.

  However, after the coating film of the inorganic molding plate is peeled off in this way, until the coating is performed again, the appearance of the part where the coating film has peeled is deteriorated because the surface of the inorganic molding plate is exposed. End up. At this time, if the inorganic molding plate itself is colored in the same color as the coating film, the portion will not be noticeable even if the coating is peeled off, but the inorganic molding plate is colored to color only the surface of the inorganic molding plate. In order to color the entire plate, it is necessary to include a large amount of pigment in the cement-based molding material. In this case, the pigment existing in the interior of the inorganic molding plate does not contribute to the improvement of the appearance, and the cost is reduced. There are problems from the viewpoint of resource saving.

  Therefore, in manufacturing an inorganic molded plate, it is conceivable to laminate and mold a colored coating layer on the surface of the inorganic molded plate. For example, after obtaining a green sheet in which a cement-based molding material is formed into a sheet by papermaking or the like, a molding material containing a pigment as a powder material is sprayed on the upper surface of the green sheet, and in this state, it is integrated by curing and curing. By molding, it is possible to obtain an inorganic molded plate integrally having a coating layer colored on the surface layer. In this way, the inorganic molded plate can be colored while reducing the amount of pigment used as much as possible.

Thus, when spraying the powder material for forming the colored coating layer on the green sheet, it has been considered to employ a technique of spraying the powder material on the green sheet or the like for various purposes. For example, in the one described in Patent Document 1, powder material is supplied to a recess of a rotating drum body having a plurality of recesses on the outer peripheral surface, and the rotating drum body is rotated to lower the powder material in the recess. The powder material is dropped, and further, the powder material passes through the slat-shaped shield, and then reaches the upper surface of the substrate.
JP 2005-34815 A

  However, the one described in Patent Document 1 is for the powder material to disperse the powder material non-uniformly on the upper surface of the base material by passing through the sword-shaped shield. Even if not used, since the powder material is dropped from the plurality of recesses, the powder material to be spread tends to become dense and difficult to spread evenly. Also, in order to reduce the amount of pigment used, it is necessary to laminate the powder material as thinly as possible. Dispersing the powder material uniformly and thinly in this way is extremely difficult with conventional methods. Met.

  It is also conceivable that the powder material is supplied to the belt feeder, conveyed by the belt feeder and dropped from the downstream end thereof, and the powder material is sprayed. It is difficult to convey the powder uniformly, and it is easy for the powder material to become dense and dense.

  The present invention has been made in view of the above points, and an object thereof is to provide a powder spraying device capable of spraying a powder material on the upper surface of a substrate to be transported and laminating it uniformly and thinly. It is what.

  A powder spreading apparatus according to the present invention includes a hopper 2 to which a powder material 1 is supplied, and a rotary that is disposed in the hopper 2 and is driven to rotate to drop the powder material 1 in the hopper 2 downward. A feeder 3, a belt feeder 4 that receives and conveys the powder material 1 falling from the hopper 2, and a powder material 1 that is disposed above the belt feeder 4 with a gap therebetween and passes through the gap. The powder material 1 is scraped downward by rotationally driving it while being in contact with the powder material 1 conveyed to the downstream end of the belt feeder 4. A scraping rotor 6 for spraying is provided. In the powder spraying apparatus A, the powder material 1 supplied onto the belt feeder 4 by driving the rotary feeder 3 is conveyed by the conveyance amount adjuster 5 when being conveyed on the belt feeder 4. Is adjusted and is uniformly dispersed in a direction perpendicular to the conveying direction on the belt feeder 4, and the powder material 1 is scraped off by the scraping rotor 6 at the downstream end of the belt feeder 4. As a result, it does not remain attached to the belt feeder 4 and falls down and is uniformly dispersed.

  In the powder spreader A, the powder on the belt feeder 4 is disposed in the hopper 2 above the rotary feeder 3 and has spiral blades 8 in opposite directions on one end side and the other end side. It is preferable to provide a widening screw 7 that is driven to rotate about a rotation axis in the horizontal direction perpendicular to the conveying direction of the material 1. In this case, when the widening screw 7 is driven to rotate, the powder material 1 in the hopper 2 can be expanded in a direction perpendicular to the conveying direction of the powder material 1 by the belt feeder 4. Thus, the belt feeder 4 can be supplied in a state of spreading in the width direction of the belt feeder 4, and the supply amount of the powder material 1 at both ends in this direction is not insufficient.

  In addition, it is preferable to include vibration applying means 9 for applying vibration to the hopper 2. In this case, by operating the vibration applying means 9, the powder material 1 in the hopper 2 can be leveled, and when the powder material 1 is supplied from the hopper 2 to the belt feeder 4, the powder material 1 becomes uniform. Can be supplied in a spread state.

  Further, on the upstream side of the conveyance amount adjuster 5, a conveyance amount adjustment auxiliary device 10 is provided above the belt feeder 4 with a gap and adjusts the conveyance amount of the powder material 1 passing through the gap. It is preferable to comprise. In this case, the conveyance amount of the powder material 1 on the belt feeder 4 can be adjusted in two stages by the conveyance amount adjuster 5 and the conveyance amount adjustment auxiliary device 10, and the conveyance amount of the powder material can be adjusted more accurately. can do.

  Further, the transport amount adjusting auxiliary device 10 is configured by arranging a plurality of rotating pieces 11 that are rotatable about a vertical axis in a direction perpendicular to the transport direction of the powder material 1 on the belt feeder 4. It is also preferable. In this case, by rotating the rotating piece 11, the density distribution of the powder material 1 on the belt feeder 4 can be adjusted, whereby the powder material 1 is more evenly distributed on the belt feeder 4. Can be transported.

  Further, it is preferable to provide a leveler 12 that reciprocates in the horizontal direction perpendicular to the conveying direction of the powder material 1 above the belt feeder 4 on the upstream side of the conveying amount adjuster 5. In this case, the powder material 1 accumulated on the upstream side of the transport amount adjuster 5 with the adjustment of the transport amount of the powder material 1 by the transport amount adjuster 5 is leveled by operating the leveler 12. For this reason, when the powder material 1 passes through the conveyance amount adjuster 5, it is possible to prevent the generation of roughness and to convey the powder material 1 in a state of being uniformly spread in the width direction of the belt feeder 4.

  Moreover, it is preferable to form the lower end surface 5a facing the said belt feeder 4 of the said conveyance amount regulator 5 so that it may incline up toward the conveyance direction of the powder material 1 on the said belt feeder 4. As shown in FIG. In this case, when the powder material 1 passes through the conveyance amount adjuster 5, the powder material 1 is not compressed between the lower end surface 5 a of the conveyance amount adjuster 5 and the belt feeder 4. It is possible to prevent the material 1 from being compressed and becoming lumpy or causing the distribution of the powder material 1 on the belt feeder 4 to become coarse and dense.

  Also, a first sieve 13 that vibrates in the horizontal uniaxial direction below the lower end of the belt feeder 4 and a second vibrator that vibrates in the horizontal direction perpendicular to the uniaxial direction below the first sieve 13. It is preferable to comprise the sieve 14 of this. In this case, the powder material 1 falling downward from the belt feeder 4 sequentially passes through the first sieve 13 and the second sieve 14 so that the powder material 1 is dispersed in a more uniformly dispersed state. .

  The belt feeder 4 includes a conveyor belt 15 and a roller 16 around which the conveyor belt 15 is suspended. The conveyor belt 15 has a ridge 17 on the back surface, and the roller 16 is disposed on the circumferential surface thereof. It is preferable to have a concave groove 18 into which the ridge 17 is fitted. In this case, the meandering of the conveyor belt 15 is prevented, and the supply position of the powder material 1 conveyed by the conveyor belt 15 to the belt feeder 4 and the application position from the belt feeder 4 are constant, and the powder application apparatus From A, the powder material 1 can be dispersed at a fixed position and distribution.

  Moreover, it is preferable to provide weirs 26 for preventing the powder material 1 from dropping off at both end edges of the surface of the conveyor belt 15 constituting the belt feeder 4. In this case, it is possible to prevent the powder material 1 from falling off during the conveyance process by the belt feeder 4, to prevent the powder material 1 from being scattered, and to stabilize the amount of the powder material 1 sprayed from the belt feeder 4.

  Moreover, it is preferable to provide a weight measuring device 19 for measuring the weight of the powder material 1 on the belt feeder 4. In this case, the weight of the powder material 1 on the belt feeder 4 can be managed, and when the weight is excessive, the supply of the powder material 1 from the hopper 2 is reduced or stopped, and the weight is too small. In this case, the supply amount of the powder material 1 from the hopper 2 can be increased to keep the supply amount of the powder material 1 to the belt feeder 4 appropriate.

  Further, the powder spraying device sprays the powder material 1 on the upper surface of the base material 21 transported through the base material transport path 20 disposed below, and the powder transport device 20 in the base material transport path 20 It is also preferable to include a control unit 22 that controls the rotational speed of the rotary feeder 3 and the transport speed of the powder material 1 by the belt feeder 4 based on the detection result of the transport speed of the base material 21. In this case, it becomes possible to laminate the powder material 1 uniformly and thinly on the upper surface of the base material 21, and in particular, a powder dispersed on the base material 21 using a molding material containing a pigment as the powder material 1. If the coating layer which coat | covers the base material 21 with the material 1 is formed, a colored coating layer can be formed in the surface layer of the base material 21, reducing the usage-amount of a pigment. At this time, the amount of the powder material 1 sprayed from the powder spraying device A can be adjusted in conjunction with the transport speed of the base material 21 in the base material transport path 20, and the powder per area of the base material 21 can be adjusted. It becomes possible to accurately control the amount of the body material 1 applied.

  According to the present invention, even when the amount of powder material sprayed from the powder spraying device is small, the amount of powder material sprayed from the powder spraying device is stabilized and uniformly dispersed. In particular, it is suitable for uniformly and thinly laminating a powder material on the upper surface of a substrate to be conveyed.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 5 is an example of a manufacturing process of a cement-based molded plate provided with the powder spraying device A.

  In this step, a flow box 30 in which slurry-like cement-based molding material is stored is provided at one end, and the cement-based molding material is supplied onto the papermaking belt 31 from the flow box 30.

  As the cement-based molding material, an appropriate material can be used. For example, cement is a main component, and, if necessary, reinforcing fibers such as pulp, vinylon fiber, polypropylene fiber, silica (silica powder, silica fume, fly) Ashes), aggregates such as shirasu balloons, and the like are added, mixed with a required amount of water, and adjusted to a predetermined solid content concentration. Specifically, for example, 100 parts by weight of normal Portland cement 50% by weight, pulp 5% by weight, silica stone powder 40% by weight and silica fume 5% by weight are mixed with 100 parts by weight of water to form a slurry. Those having a solid content concentration of 50 weight can be used.

  The papermaking belt 31 is made of felt or the like and has water permeability, is formed in an endless shape, is suspended on a driving roll and a driven roll 32, and is drawn out in a substantially horizontal direction from the flow box 30 in one direction. After that, the other end of the process is turned around on a circular track that is folded downward and returned to the flow box 30 side. At this time, the upper surface on the upper side of the papermaking belt 31 serves as a base material conveyance path 20 through which the green sheet 21a as the base material 21 is conveyed. A suction means 33 such as a suction box 33a is provided below the substrate conveyance path 20.

  Further, a water permeable sheet 35 is disposed near the flow box 30 side above the substrate conveyance path 20. The water permeable sheet 35 is formed in an endless shape and is suspended by a drive roll and a follower roll 36, and moves around the orbit in the direction opposite to the papermaking belt 31. A vibration exciter 37 that functions as slurry vibration means for applying vibration to the base material 21 on the papermaking belt 31 via a water-permeable sheet 35 is disposed at a position upstream of the papermaking belt 31.

  The powder spraying apparatus A sprays the powder material 1 onto the green sheet 21a transported in the base material transport path 20 above the base material transport path 20 in the manufacturing process of the cement-based molded plate as described above. Can be provided. As the powder material 1, any suitable material can be used. For example, reinforcing fibers such as cement, pulp, vinylon fiber, polypropylene fiber, etc. similar to the above-mentioned cement-based molding material, silica (silica powder, silica fume, fly ash) Etc.), those containing shirasu balloons and the like can be used, and the colored powder material 1 further containing an appropriate pigment can be used. Specifically, for example, each component is mixed in a proportion of 50% by weight of ordinary Portland cement, 2% by weight of cellulose powder, 40% by weight of silica powder, and 8% by weight of silica sand, and further, black pigment is added to 100 parts by weight of these mixtures. What mix | blended 3 weight part etc. can be used.

  As shown in FIG. 1, the powder spreader A has a hopper 2 to which a powder material 1 is supplied and a powder material 1 in the hopper 2 that is disposed in the hopper 2 by being driven to rotate downward. A rotary feeder 3 to be dropped into the belt, a belt feeder 4 for receiving and conveying the powder material 1 falling from the hopper 2, and a powder material by being brought into sliding contact with the powder material 1 conveyed on the belt feeder 4. The powder material 1 is scraped downward by rotationally driving while being in contact with the powder material 1 conveyed to the downstream end of the belt feeder 4 and the conveyance amount adjuster 5 for adjusting the conveyance amount of the material 1. It is comprised with the scraping-off rotor 6 sprayed as a drop.

  In the illustrated example, a supply port 39 for supplying the powder material 1 into the hopper 2 is provided at a substantially central portion of the upper surface of the hopper 2. A rotary feeder 3 is provided above the lower end opening 40 of the hopper 2. The rotary feeder 3 is formed by disposing a roller 42 that can be driven to rotate in an arrangement space 41 provided in the lower part of the hopper 2. The arrangement space 41 is formed in a cylindrical space that is horizontally laid down and closed at both ends, and its upper part communicates with the upper part in the hopper 2 and its lower part communicates with the lower end opening 40 of the hopper 2. Is formed. The roller 42 is arranged in the horizontal direction so that its central axis (rotating axis) substantially coincides with the central axis of the arrangement space 41, and is provided with a slight gap from the inner surface of the arrangement space 41. The rotation axis of the roller 42 is orthogonal to the conveying direction of the powder material 1 on the belt feeder 4. Thus, when the roller 42 of the rotary feeder 3 is rotationally driven in a state where the powder material 1 is stored in the hopper 2, a certain amount of the powder material 1 is supplied above one end of the belt feeder 4. It becomes. At this time, the powder material 1 falls downward in a curtain shape along the axial direction of the roller 42.

  Inside the hopper 2, a widening screw 7 that can be driven to rotate on a shaft can be provided. As shown in FIG. 2, the widening screw 7 is provided with spiral blades 8 in opposite directions on one end side and the other end side, and the rotation axis thereof is orthogonal to the conveying direction of the powder material 1 on the belt feeder 4. The horizontal direction is the same as the rotation axis of the roller 42 in the rotary feeder 3. Further, the axial rotation direction of the widening screw 7 is the same as the spiral rotation direction from the end of each spiral blade 8 toward the inside.

  When such a widening screw 7 is driven to rotate, the powder material 1 in the hopper 2 can be spread and made uniform in the axial direction of the widening screw 7. In particular, even when the powder material 1 in the hopper 1 is piled up by supplying the powder material 1 into the hopper 2 from the supply port 39 provided in the substantially central portion of the hopper 2 as described above, the widening is performed. By operating the screw 7, the powder material 1 can be spread evenly in the lateral direction. When the powder material 1 is supplied from the hopper 1 above one end of the belt feeder 4, The body material 1 can be supplied uniformly without running out of material. Further, the widening screw 7 also functions as a bridge breaker, so that the powder material 1 can be stably supplied from the hopper 2 to the belt feeder 4.

  The hopper 2 is provided with vibration applying means 9 for applying vibration to the hopper 2. As the vibration applying means 9, an appropriate vibration motor 3 a can be provided on the outer surface of the hopper 2, for example. By operating such a vibration applying means 9, the powder material 1 in the hopper 2 can be leveled, and the occurrence of coarseness of the powder material 1 inside the hopper 2 can be prevented. The powder material 1 supplied to the belt feeder 4 can be further uniformly dispersed.

  The upper surface of the belt feeder 4 is disposed below the lower end opening 40 of the hopper 2, and the powder material 1 supplied from the hopper 2 can be received by the belt feeder 4 as described above. ing. At this time, the conveying direction of the belt feeder 4 and the rotation axis of the roller 42 of the rotary feeder 3 in the hopper 2 are arranged so as to be orthogonal to each other, whereby the powder material 1 falling from the hopper 2 into a curtain shape is transferred to the belt feeder. 4 is supplied so as to spread uniformly in a direction perpendicular to the conveying direction.

  The belt feeder 4 includes an endless transport belt 15 and a roller 16 around which the transport belt 15 is suspended. At least two rollers 16 are arranged in parallel and parallel to each other, and at least one of them is formed as a driving roller 16 that is driven to rotate by receiving a driving force from a motor or the like.

  As shown in FIG. 3, convex strips 17 are provided on the back surface of the conveyor belt 15 in the vicinity of the edge portions on both sides. The ridges 17 are similarly formed endless along the end edge of the endless conveying belt 15. On the other hand, the roller 16 is provided with a groove 18 having a shape matching the ridge 17 over the entire circumference thereof. For this reason, the conveyor belt 15 is hung on the roller 16 with the ridges 17 engaged with the concave grooves 18 of the roller 16. For this reason, when the belt feeder 4 is operated, the meandering of the conveying belt 15 is prevented by the fitting of the ridges 17 and the grooves 18, and the belt of the powder material 1 conveyed by the conveying belt 15. The supply position to the feeder 4 and the spraying position of the powder material 1 from the belt feeder 4 are constant, and the powder material 1 can be sprayed from the powder spraying apparatus A at a constant position and distribution.

  Moreover, it is also preferable to provide a weir 26 for preventing the powder material 1 from falling off at both ends of the surface of the conveyor belt 15 as shown in the figure. In this way, it is possible to prevent the powder material 1 from dropping from the belt feeder 4 in the process in which the powder material 1 is supplied to the belt feeder 4 and conveyed on the belt feeder 4, and the powder Scattering of the body material 1 can be prevented. Further, it is possible to prevent the amount of the powder material 1 conveyed by the belt feeder 4 from being reduced due to the dropping of the powder material 1, and to stabilize the amount of the powder material 1 sprayed from the belt feeder 4. Is something that can be done.

  Although not shown, the hopper 2 and the belt feeder 4 can be provided so as to be supported by a support housing such as an appropriate frame material.

  The conveyance amount adjuster 5 is disposed above the belt feeder 4 and downstream of the position where the powder material 1 is supplied to the belt feeder 4. The conveyance amount adjuster 5 can be formed, for example, such that a flat plate material is erected above the belt feeder 4 with its lower end surface 5a facing the upper surface of the belt feeder 4 with a gap. At this time, the conveyance amount of the powder material 1 that passes through the conveyance amount adjuster 5 is regulated by the size of the gap between the lower end surface 5 a of the conveyance amount adjuster 5 and the belt feeder 4. The conveyance amount of the powder material 1 to be conveyed is adjusted.

  The lower end surface 5a of the conveyance amount adjuster 5 is preferably formed so as to incline upward in the conveyance direction of the powder material 1 on the belt feeder 4, for example, this angle can be formed at 45 °. . In this way, when the powder material 1 passes through the conveyance amount adjuster 5, no pressing force is applied between the lower end surface 5 a and the upper surface of the belt feeder 4. Can be prevented from being compressed and becoming lumpy, and the distribution of the powder material 1 on the belt feeder 4 can be prevented from becoming coarse and dense. Here, when the inclination direction of the lower end surface 5a is opposite to the above, the gap between the lower end surface 5a and the upper surface of the belt feeder 4 becomes narrower toward the downstream side, so that the powder material 1 is conveyed downstream. As a result, a pressing force is applied to the powder material 1 from between the lower end surface 5 a and the upper surface of the belt feeder 4, and the powder material 1 is compressed to become lumpy or the powder material on the belt feeder 4. 1 may occur, and the powder material 1 may not be uniformly sprayed from the powder spraying apparatus A.

  The distance between the lower end surface 5a of the conveyance amount adjuster 5 and the upper surface of the belt feeder 4 is appropriately set according to the conveyance amount of the powder material 1 to be adjusted, for example, a desired value of 20 mm or less. The interval may be, for example, 10 mm. At this time, if the arrangement position of the conveyance amount adjuster 5 is formed to be movable up and down, the conveyance amount of the powder material 1 can be changed by changing the interval.

  In addition, the conveyance amount adjuster 5 may be provided with vibration applying means 44 such as a vibration motor. In this case, even if the distance between the lower end surface 5a of the conveyance amount adjuster 5 and the upper surface of the belt feeder 4 is narrow, the vibration applying means 44 applies vibration to the conveyance amount adjuster 5 to thereby make the powder material 1 Can be prevented and uniform supply of the powder material 1 can be ensured.

  Further, on the upstream side of the conveying amount adjuster 5 in the conveying direction of the powder material 1 by the belt feeder 4, between the conveying amount adjuster 5 and the supply position of the powder material 1 in the belt feeder 4. Further, a conveyance amount adjustment auxiliary device 10 may be provided (see FIG. 4). Similarly to the conveyance amount adjuster 5, the conveyance amount adjustment auxiliary device 10 stands above the belt feeder 4, for example, with a flat plate-like plate material facing the upper surface of the belt feeder 4 with a gap therebetween. The conveyance amount of the powder material 1 can be adjusted by the same method as the conveyance amount adjuster 5. Thereby, the conveyance amount of the powder material 1 can be adjusted in two steps by the conveyance amount adjustment auxiliary device 10 and the conveyance amount adjuster 5, and the conveyance amount can be adjusted more accurately.

  At this time, the distance between the lower end surface of the carry amount adjusting auxiliary device 10 and the upper surface of the belt feeder 4 is also adjusted as appropriate, but is wider than between the lower end surface 5a of the carry amount adjuster 5 and the upper surface of the belt feeder 4. When the interval is set, the conveyance amount can be adjusted more precisely by the conveyance amount adjuster 5 after the conveyance amount is once adjusted by the conveyance amount adjustment auxiliary device 10. The gap can be set to a range of 10 to 20 mm, for example. Further, if the arrangement position of the conveyance amount adjusting auxiliary device 10 is also formed so as to be movable up and down, the conveyance amount of the powder material 1 can be changed by changing the interval.

Further, the conveyance amount adjustment auxiliary device 10 arranges a plurality of rotating pieces 11 that are rotatable about a vertical rotation shaft 45 in a direction orthogonal to the conveying direction of the powder material 1 on the belt feeder 4. May be configured. In this case, when each rotation piece 11 is rotated to adjust its arrangement angle and arranged so as to be inclined with respect to the conveying direction of the powder material 1, the powder material 1 passes through this rotation piece 11. Therefore, there is a tendency that the distribution of the powder material 1 becomes dense along the inclination direction by being guided by the inclination of the rotating piece 11.
Thereby, the distribution of the powder material 1 in the direction orthogonal to the conveying direction of the powder material 1 can be changed. In addition, the distribution of the powder material 1 in the direction orthogonal to the conveying direction of the powder material 1 can be adjusted by separately adjusting the gap between the lower end surface of the rotating piece 11 and the upper surface of the belt feeder 4. Can be changed. For this reason, the powder spraying apparatus A is actually used due to various factors such as dimensional errors at the time of manufacturing the members constituting the powder spraying apparatus A according to the present invention and the dimensional deviation of these members over time. Even in the case where the distribution of the amount of powder dispersed during operation is uneven, the powder material 1 is sprayed from the powder spraying device A by adjusting the arrangement angle of the rotating piece 11. It is possible to finely adjust the distribution of the amount and uniformly spread.

  Further, on the upstream side of the conveying amount adjuster 5 in the conveying direction of the powder material 1 by the belt feeder 4, between the conveying amount adjuster 5 and the supply position of the powder material 1 in the belt feeder 4. A leveler 12 may be provided (see FIG. 4). In the illustrated example, a leveler 12 is provided between the transport amount adjuster 5 and the transport amount adjustment auxiliary device 10. The leveler 12 can be formed of a member having a flat bottom surface, and is disposed above the belt feeder 4 with a space therebetween, in a horizontal direction perpendicular to the conveying direction of the powder material 1 on the belt feeder 4. It is formed so that it can be driven back and forth. The distance between the upper surface of the belt feeder 5 and the leveler 12 is appropriately set. For example, a desired distance can be set within a range of 20 mm or less, but the lower end surface 5a of the conveyance amount adjuster 5 and the belt feeder 4 It is preferable to make it larger than the distance between the upper surface. Further, an appropriate drive mechanism for the leveler 12 can be adopted, and for example, an appropriate actuator 43 such as a rodless cylinder can be provided.

  When such a leveler 12 is provided, when the conveyance amount of the powder material 1 is adjusted by the conveyance amount adjuster 5, the powder material 1 that has not passed through the conveyance amount adjuster 5 on the upstream side thereof. Even if the powder material 1 is accumulated in a pile shape and the density of the powder material 1 is generated, the powder material 1 in the pile shape is leveled and the density is eliminated by reciprocating the leveler 12. Thus, it is possible to suppress the occurrence of density in the distribution of the powder material 1 when passing through the conveyance amount adjuster 5.

  Further, a scraping rotor 6 that can be driven to rotate is disposed above the downstream end of the belt feeder 4. The peripheral surface of the scraping rotor 6 is preferably formed in a concavo-convex shape with a plurality of grooves and a plurality of spike-like projections, and the rotation axis thereof is in the direction of conveyance of the powder material 1 on the belt feeder 3. The horizontal direction is orthogonal. At this time, in the illustrated example, the lower end of the scraping rotor 6 is disposed above the downstream edge of the belt feeder 4. The space between the scraping rotor 6 and the belt feeder 4 is smaller than the deposited thickness of the powder material 1 on the belt feeder 4, that is, the lower end surface 5 a of the conveyance amount adjuster 5 and the upper surface of the belt feeder 4. It is preferable to arrange a gap that is smaller than the gap between the two, or the scraping rotor 6 and the belt feeder 4 to be in contact with each other. For example, the interval between the scraping rotor 6 and the belt feeder 4 can be set to a desired interval within a range of 5 mm or less. Further, the rotational driving direction of the scraping rotor 6 is set so that the moving direction of the peripheral surface disposed below the scraping rotor 6 coincides with the conveying direction of the powder material 1 on the belt feeder 4.

  The scraping rotor 6 is rotationally driven while being in contact with the powder material 1 conveyed to the downstream end of the belt feeder 4, thereby scraping the powder material 1 that has come into contact with the powder material 1 in the belt feeder 4. The powder material 1 is urged toward the conveying direction of the powder material 1, and thus the powder material 1 is reliably and stably dispersed while dispersing the powder material 1 sprayed downward from the downstream edge of the belt feeder 4. Then, it can be sprayed from the downstream edge of the belt feeder 4. On the other hand, if the scraping-off rotor 6 is not provided, the powder material 1 may be scattered in a lump or may not be sprayed while adhering to the belt feeder 4, and the dispersibility of the powder material 1 to be sprayed may be increased. May result in poor or non-uniform dispersion.

  Moreover, it is preferable to provide a sieve below the lower end portion of the belt feeder 4, whereby the powder material 1 dispersed from the belt feeder 4 can be dispersed more uniformly and dispersed. If such a sieve that is particularly driven by vibration is provided, the powder material 1 can be more uniformly dispersed and dispersed. In the illustrated example, a first sieve 13 that is driven to vibrate in the horizontal uniaxial direction and a second sieve 14 that is vibrated and driven in the horizontal direction perpendicular to the uniaxial direction are provided below the first sieve 13. The vibrations of the sieves 13 and 14 can be driven by, for example, providing a vibration motor for applying vibrations to the sieves 13 and 14. Thus, if the sieve which vibrates each in the direction orthogonal to each other is provided, when passing the 1st sieve 13, the powder material 1 will be uniformly disperse | distributed to a uniaxial direction, and also will pass the 2nd sieve 14. In this case, the powder material 1 can be uniformly dispersed in the axial direction perpendicular to the uniaxial direction, and the dispersibility of the powder material 1 becomes higher.

  The sieves 13 and 14 as described above can be formed of a metal mesh or the like, and the opening thereof is set as appropriate, but can be in the range of 0.5 to 5 mm, for example.

  Each of the sieves 13 and 14 can be arranged in a state of being supported on the upper surface of a sieve (supporting sieve) having a larger opening. This supporting sieve has a function of supporting each of the sieves 13 and 14 so as not to loosen or deform. That is, the sieves 13 and 14 having small openings also have a smaller wire diameter for forming the sieves. In particular, when the sieves 13 and 14 are driven to vibrate as described above, the shape of the sieves 13 and 14 can be maintained. Although difficult, it is possible to maintain the shape of the respective sieves 13 and 14 by supporting them with a support sieve composed of a wire having a larger opening and a larger wire diameter so that no loosening or deformation occurs. it can. Thereby, the uniform dispersibility of the powder material 1 which passes each sieve 13 and 14 further improves.

Moreover, when forming such a powder dispersion | spreading apparatus A as what disperse | distributes the powder material 1 on the upper surface of the base material 21 conveyed by the base material conveyance path 20 arrange | positioned under it as mentioned above. If the conveyance speed of the base material 21 in the base material conveyance path 20 is detected and the rotational speed of the rotary feeder 3 and the conveyance speed of the powder material 1 by the belt feeder 4 are controlled based on the detection result, A predetermined amount of the powder material 1 set in advance can be sprayed onto the base material 21.
That is, by adjusting the rotational speed of the rotary feeder 3, the supply amount of the powder material 1 supplied from the hopper 2 to the belt feeder 4 is adjusted, and further, the conveyance speed of the powder material 1 by the belt feeder 4 is adjusted. By adjusting the amount of powder material 1 sprayed from the downstream end of the belt feeder 4, the amount of spray can be set in conjunction with the conveying speed of the base material 21. The amount of spraying per area of 21 can be controlled to be a predetermined amount.

  Here, an appropriate method can be adopted for detection of the conveyance speed of the base material 21 in the base material conveyance path 20. For example, it is supplied to a motor that transmits a rotational driving force to the drive roll of the papermaking belt 31. The conveyance speed can be detected based on the drive current amount, and the conveyance speed of the substrate 21 can be detected based on the result. The control of the rotary feeder 3 and the belt feeder 4 based on the detection result is, for example, a signal of the detection result of the conveyance speed detected by an appropriate detector is input, and the rotary feeder 3 and the belt feeder 4 are based on this signal. This can be done by providing a control unit 22 such as a CPU that outputs a control signal to the drive mechanism.

  A weight measuring device 19 for measuring the weight of the powder material 1 on the belt feeder 4 can also be provided. An appropriate device such as a load cell (load sensor) can be provided as the weight measuring device 19, and at this time, for example, a device that measures the weight of the entire belt feeder 4 is provided as the weight measuring device 19. The weight of the powder material 1 on the belt feeder 4 can be measured based on the weight change. In this case, the supply amount of the powder material 1 to the belt feeder 4 is adjusted so that the amount of the powder material 1 existing on the belt feeder 4 falls within an appropriate range based on the measurement result by the weight measuring device 19. It becomes possible to do.

  For example, when the amount of the powder material 1 on the belt feeder 4 exceeds the proper range, the supply amount of the powder material 1 from the hopper 2 can be reduced or the supply can be stopped. In this case, when the powder material 1 supplied to the belt feeder 4 passes through the transport amount adjuster 5 as described above, the transport amount is adjusted, and the powder material that has not passed through the transport amount adjuster 5. Even if 1 accumulates on the upstream side of the conveyance amount adjuster 5, when the amount of the accumulated powder material 1 becomes excessive, the supply amount of the powder material 1 from the hopper 2 is reduced or the supply is reduced. By temporarily stopping, the powder material 1 on the belt feeder 4 is prevented from becoming coarse and dense, and the powder material 1 that has passed through the conveyance amount adjuster 5 is prevented from being coarse or dense, or the accumulated powder material 1 Can be prevented from spilling from the belt feeder 4. On the contrary, when the amount of the powder material 1 becomes less than the proper range, the amount of the powder material 1 supplied from the hopper 2 is increased or the supply amount is stopped, so that the conveyance amount adjuster 5 is adjusted. It is possible to prevent the amount of the powder material 1 that passes and is conveyed on the belt feeder 4 from being reduced, and to reduce the amount of the powder material 1 that is sprayed from the powder spreader A. Can be prevented. As a result, the amount of the powder material 1 on the belt feeder 4 can be adjusted to an appropriate range.

  The supply amount of the powder material 1 to the belt feeder 4 based on the measurement result by the weight measuring device 19 can be adjusted by various methods. For example, a detection signal from the weight measuring device 19 is input, and based on the detection signal. This can be done by providing a control unit 22 such as a CPU that outputs a control signal to the drive mechanism of the rotary feeder 3. The control unit 22 can be the same as the control unit 22 that controls the rotary feeder 3 and the belt feeder 4 based on the conveyance speed of the base material 21. At this time, the control unit 22 outputs a control signal to the drive mechanism of the rotary feeder 3 when the weight of the powder material 1 on the belt feeder 4 detected by the weight measuring device 19 exceeds a predetermined range, for example. The supply of the powder material 1 to the belt feeder 4 of the powder material 1 by the rotary feeder 3 is stopped for a certain time, or the supply amount is reduced for a certain time, and the powder material 1 on the belt feeder 4 is reduced. When the weight falls below a predetermined range, a control signal is output to the drive mechanism of the rotary feeder 3 so that the amount of powder material supplied to the belt feeder 4 of the powder material 1 by the rotary feeder 3 is increased for a certain time. It is possible to provide a device that performs simple control.

  As shown in FIG. 6, the powder spreading device A formed in this way is such that the downstream edge of the belt feeder 4 has a water permeable sheet of the base material conveyance path 20 in the manufacturing process of the cement-based molded plate. The green sheet 21 a that is transported through the base material transport path 20 passes below the downstream edge of the belt feeder 4. ing. At this time, when the sieves 13 and 14 are provided, they are provided between the downstream edge of the belt feeder 4 and the base material conveyance path 20.

  In forming a cement-based molded plate by the manufacturing process of the cement-based molded plate provided with the powder spraying apparatus A configured as described above, first, the cement-based molded material forms the base material conveyance path 20 from the flow box 30. The cement-based molding material is fed into the sheet-forming belt 31 and is formed into a sheet by being conveyed through the substrate conveyance path 20 while being sandwiched between the sheet-forming belt 31 and the water-permeable sheet 35 that are driven to rotate. A green sheet 21 a is formed, and moisture is sucked in the suction box 33 a as the suction means 33 while the green sheet 21 a is being transported through the substrate transport path 20. At this time, since vibration is applied to the green sheet 21a by the vibration exciter 37, moisture contained in the green sheet 21a is efficiently released.

  The green sheet 21a conveyed through the substrate conveying path 20 passes through the water-permeable sheet 35, then passes below the downstream edge 2a of the belt feeder 4 in the powder spraying apparatus A, and the powder is formed on the upper surface thereof. Material 1 is spread.

  The operation of the powder spreader A at this time is as described above. When this powder spreader A is activated, the powder material 1 in the hopper 2 is first supplied onto the belt feeder 4 by the rotary feeder 3. Is done. While the powder material 1 is being conveyed on the belt feeder 4, the powder material 1 first passes through a conveyance amount adjustment auxiliary device 10, and the conveyance amount is preliminarily adjusted, and then leveled by passing through a leveler 12, and then conveyed. By passing through the amount adjuster 5, the transport amount is finally adjusted.

  Next, the powder material 1 is sprayed downward from the downstream edge of the belt feeder 4, and after the powder material 1 sequentially passes through the first sieve 13 and the second sieve 14, the substrate conveyance path 20 is uniformly spread on the surface of the base material 21 such as the green sheet 21a conveyed on the top. Therefore, a thin layer of the powder material 1 is uniformly formed on the green sheet 21a.

  Thus, the green sheet 21a on which the powder material 1 is dispersed is further conveyed on the substrate conveyance path 20, and moisture is sucked in the suction box 33a.

  Next, the green sheet 21a is sent to a curing process and cured and molded by steam curing or the like, and a cement-based inorganic molded plate 24 is formed.

  As shown in FIG. 6, a thin and uniform coating layer 25 in which the powder material 1 is molded and cured is integrally formed on the surface of the inorganic molded plate 24 thus obtained. The inorganic molded plate 24 thus formed preferably has a thickness of 6.2 to 7.2 mm, and the coating layer 25 preferably has a thickness of 0.14 to 0.2 mm. These thicknesses are appropriately adjusted by adjusting the line speed in the above process, the supply amount of the cement-based inorganic molding material from the flow box 30, the spraying amount of the powder material 1 from the powder spraying device A, and the like.

It is a side view which shows the outline of an example of a powder spraying apparatus. It is a partial front view same as the above. It is a fragmentary sectional view same as the above. It is a partial top view same as the above. It is the schematic which shows an example of the manufacturing process of an inorganic shaping | molding board. It is sectional drawing which shows an example of an inorganic shaping | molding board.

Explanation of symbols

DESCRIPTION OF SYMBOLS A Powder dispersal device 1 Powder material 2 Hopper 3 Rotary feeder 4 Belt feeder 5 Conveyance amount adjuster 6 Scraping rotor 7 Widening screw 8 Spiral blade 9 Vibration imparting means 10 Conveyance amount adjustment auxiliary device 11 Rotating piece 12 Leveling device DESCRIPTION OF SYMBOLS 13 1st sieve 14 2nd sieve 15 Conveyance belt 16 Roll 17 Convex strip 18 Concave groove 19 Weight measuring device 20 Base material conveyance path 21 Base material 26 Weir

Claims (12)

  A hopper to which the powder material is supplied, a rotary feeder that is disposed in the hopper and rotates to drop the powder material in the hopper downward, and receives the powder material falling from the hopper. A belt feeder that conveys the belt, a conveyance amount adjuster that adjusts the conveyance amount of the powder material that is disposed above the belt feeder and passes through the gap, and a downstream end of the belt feeder. A powder spraying device comprising: a scraping rotor that scrapes and sprays the powder material downward by rotating while being in contact with the transported powder material.   A horizontal rotating shaft that is disposed above the rotary feeder in the hopper and has spiral blades in opposite directions on one end side and the other end side, and is orthogonal to the conveying direction of the powder material on the belt feeder. The powder spreader according to claim 1, further comprising a widening screw that is driven to rotate about the axis.   The powder spraying device according to claim 1 or 2, further comprising vibration applying means for applying vibration to the hopper.   A conveyance amount adjustment auxiliary device is provided on the upstream side of the conveyance amount adjuster so as to adjust the conveyance amount of the powder material that is disposed above the belt feeder with a gap and passes through the gap. The powder spraying apparatus according to any one of claims 1 to 3.   The conveyance amount adjustment auxiliary device is configured by arranging a plurality of rotating pieces that are rotatable about a vertical axis in a direction perpendicular to the conveying direction of the powder material on the belt feeder. The powder spraying apparatus according to any one of claims 1 to 3.   The leveler which reciprocates in the horizontal direction orthogonal to the conveyance direction of a powder material above the said belt feeder is provided in the upstream of the said conveyance amount regulator, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The powder dispersal device described in 1.   The lower end surface of the transport amount adjuster facing the belt feeder is formed so as to be inclined upward in the transport direction of the powder material on the belt feeder. The powder dispersion apparatus according to any one of the above.   Below the lower end of the belt feeder, there is provided a first sieve that is driven to vibrate in the horizontal uniaxial direction and a second sieve that is vibrated and driven in the horizontal direction perpendicular to the uniaxial direction below the first sieve. The powder spraying apparatus according to any one of claims 1 to 7, wherein   The belt feeder includes a conveyor belt and a roller on which the conveyor belt is suspended, and the conveyor belt has a ridge on the back surface, and the roller has a groove in which the ridge is fitted on the circumferential surface. The powder spraying device according to any one of claims 1 to 8, characterized by comprising:   The powder spraying device according to any one of claims 1 to 9, wherein weirs are provided at both end edges of the surface of the conveyor belt constituting the belt feeder to prevent the powder material from falling off. .   The powder spraying device according to any one of claims 1 to 10, further comprising a weight measuring device for measuring the weight of the powder material on the belt feeder.   The powder spraying device sprays the powder material on the upper surface of the base material transported through the base material transport path disposed below, and the transport speed of the base material in the base material transport path is The powder spraying device according to any one of claims 1 to 11, further comprising a control unit that controls a rotation speed of the rotary feeder and a conveying speed of the powder material by the belt feeder based on a detection result.

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