JP2012228639A - Powder scattering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder scattering apparatus capable of evenly and precisely scattering many kinds of powders in accordance with a scatter object body without being limited by powder characteristics.SOLUTION: This powder scattering apparatus 10 rotates a scattering roller 22 provided at a lower part of a powder storage chamber 20 and scatters the powder 12 attached to a roller surface of the scattering roller 22 to a scatter object body 11 passing below the scattering roller 22. This powder scattering apparatus 10 includes: a plurality of recessed parts 23 formed on a surface of the scattering roller 22, arranged along a roller shaft direction and a circumferential direction, scattering and accommodating the powder on the entire roller surface, and discharging the powder from the powder storage chamber; a pair of brush rollers 30 in contact with the roller surface from both sides of the scattering roller 22; and a pair of space partitioning roller 40 in contact with the brushes of the brush rollers 30 and forming a scattering closed space 36 relative to the scatter body 11.

Description

  The present invention relates to a powder spraying device for spraying powder to be sprayed with powder that cannot be sprayed by a conventional device due to lack of fluidity and chargeability.

  If the laminated organic material sheet such as a laminate, a plastic film, or a rubber sheet is left as it is, it may adhere to each other and cause inconvenience in a subsequent process such as printing. For this reason, when a plastic film or a rubber sheet is generally taken up, a powder using starch as a raw material is dispersed on these surfaces to prevent the occurrence of a blocking phenomenon.

  In order to prevent such a blocking phenomenon, a powder spraying device disclosed in Patent Document 1 is known. In the conventional powder spraying device, a rotating roller is disposed in the lower opening of the powder storage tank storing the powder to be sprayed, and the roller is rotated to adhere the powder in the powder storage tank to the roller. The adhering powder is released from the roller by corona discharge, and is spread on a material to be spread such as a plastic film or a rubber sheet passing under the roller.

Japanese Patent No. 3773191

  However, powders that can be stably sprayed by conventional spraying devices (air method, corona discharge method, etc.) have limited powder properties such as fluidity and charging properties. There are many types of powders required for the material to be sprayed, and some of them cannot be sprayed by conventional spraying devices such as non-fluidity and chargeability. These powders are sprayed by the doctor scraping method, atmosphere spraying method, sieve vibration method, dove pickling method, etc., but the uniform and precise control of the spray amount is not possible and the spray amount is uneven and uneven. As a result, problems such as an increase in the amount of powder used occurred.

  The powder generally has a particle size of 15 μm to 25 μm and is very small and easily scattered. Therefore, there has been a problem that the dispersed powder is swollen on the object to be dispersed and the surroundings are contaminated to deteriorate the working environment.

  Accordingly, an object of the present invention is to provide a powder spraying device capable of uniformly and precisely spraying various types of powders according to the object to be sprayed without being limited to the characteristics of the powder. Another object of the present invention is to provide a powder spraying device that prevents the powder to be sprayed from scattering.

  The powder spraying device of the present invention rotates the spraying roller disposed in the lower part of the powder storage tank, and the sprayed body passes the powder adhering to the roller surface of the spraying roller below the spraying roller. A powder spraying device for spraying powder onto the surface of the spraying roller, arranged in a plurality along the roller axial direction and in the circumferential direction, and dispersedly accommodated on the entire surface of the roller to discharge the powder from the powder reservoir. A recess, a pair of brush rollers that contact the roller surface from both sides of the spray roller, and a pair of space partition rollers that contact the brush of the brush roller and form a spray-closed space between the object to be sprayed It is characterized by having.

  According to the said structure, the powder adhering to the recessed part of a spreading | diffusion roller can be uniformly spread | dispersed to a to-be-spread body by scraping off with a brush roller. Even powder that cannot be sprayed by the corona discharge method can be sprayed uniformly. Since the spraying closed space is formed by the brush roller and the space partition roller, it is possible to prevent the powder from being scattered.

  In this case, the brush roller rotates in the opposite direction to the spray roller in contact with or close to the first brush roller that contacts the concave portion and rotates in the same direction as the spray roller, and the doctor blade of the spray roller. And a second brush roller.

According to the above configuration, the powder can be uniformly sprayed on the object to be sprayed, and since the spraying closed space is formed by the spraying roller, the brush roller, and the space partition roller, the powder is prevented from scattering. can do. In addition, it is possible to prevent scattering unevenness by eliminating the dropping of the sticking to the doctor blade and falling as a lump onto the top surface of the sprayed object.
Moreover, it is good to provide the attachment / detachment part which moves the said brush roller and the said space partition roller toward the said spreading | diffusion roller along the conveyance direction of the said to-be-spread body.

  According to the said structure, the suitable pressing amount of the brush roller with respect to a spreading | diffusion roller can be arbitrarily adjusted according to the kind of powder. Accordingly, it is possible to prevent unevenness in the distribution of powder onto the object to be sprayed.

  Moreover, it is good to provide the control means which electrically connects with the drive means of the said spreading roller and the said brush roller, and makes the circumferential speed of the said brush roller faster than the said spreading roller.

According to the said structure, a powder can be scraped off uniformly by the speed difference between rollers, and it can spread on a to-be-spread body uniformly.
The space partition roller may be in a positional relationship in contact with the brush roller.

  According to the said structure, the powder adhering to a space partition roller can be effectively removed with a brush roller. Thereby, there is no dropping of the powder due to the adhesion and growth of the powder from the space partition roller, and uneven dispersion can be prevented. Moreover, powder scattering can be prevented.

  The space partition roller may be rotated in the opposite direction to the brush roller. In addition, the control means may be electrically connected to the space partition roller driving means to set the peripheral speed of the space partition roller faster than the brush roller.

  According to the above configuration, the space partition roller can repel the powder adhering to the brush tip into the spraying closed space due to the speed difference between the rollers. Therefore, it is possible to prevent the powder adhering to the brush roller from being agglomerated and dropping onto the object to be sprayed.

  According to the powder spraying device of the present invention having the above-described configuration, the powder adhered to the concave portion of the spraying roller is scraped off by the brush roller, so that the powder can be sprayed uniformly on the object to be sprayed. Further, by rotating the brush roller in contact with the doctor blade, it is possible to prevent the lump of the powder adhering to the doctor blade from growing and dropping and causing uneven dispersion. In addition, the amount of powder applied can be arbitrarily adjusted. By reliably scraping off the powder fixed in the concave part of the spray roller with the brush roller, there is no residue that becomes clogged with the powder in the concave part, and the powder is newly stabilized in the concave part of the rotating spray roller. Can be supplied. Therefore, at the discharge port of the storage tank, the powder forms an arch structure and closes, so that it is difficult to generate a so-called bridge in which the powder is not discharged from the discharge port.

  The present invention can also be applied to powders other than powders that can only be dispersed by corona discharge as in the prior art. The same applies to powder that can be dispersed by corona discharge. Further, since the corona discharge method is not adopted, it can be used as a device having a safety explosion-proof structure and safety can be improved.

Since the lower surface of the spray roller forms a spray closed space by the brush roller and the space partition roller, it is possible to prevent the sprayed powder from scattering to the outside.
In addition, since the brush roller and the space partition roller efficiently remove the powder from each other, it is possible to prevent the adhered powder from becoming a lump and falling off the scattered object.

It is a figure showing the composition outline of the powder spraying device of a 1st embodiment. It is explanatory drawing at the time of the stop of the powder spraying apparatus of 1st Embodiment. It is a figure which shows the structure outline of the powder spraying apparatus of 2nd Embodiment. It is explanatory drawing at the time of the stop of the powder spraying apparatus of 2nd Embodiment.

Embodiments of the powder spraying apparatus of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing a schematic configuration of the powder spraying apparatus of the first embodiment. As shown in the figure, the powder spraying device 10 of the first embodiment is attached to a spray roller 22 that discharges powder 12 downward from a powder storage tank 20 that stores powder 12, and to the roller surface of the spray roller 22. A brush roller 30 for scraping off the powder, a space partition roller 40 for forming a spray closed space 36 below the spray roller 22, an attachment / detachment unit 50 for moving the brush roller 30 and the space partition roller 40 back and forth, and the spray roller 22. The control unit 60 that controls the number of rotations of the brush roller 30 and the space partition roller 40 is a main basic configuration. In FIG. 1, for the sake of convenience, the conveyance direction of the object 11 is indicated by an arrow A, but the conveyance direction of the object 11 may be opposite to the arrow A.

  The powder spraying device 10 is configured to be attachable in a direction crossing the transport path on the transport path of the object 11 to be sprayed. The powder storage tank 20 is configured to store the powder 12 such as starch and to discharge the stored powder 12 from below. The powder storage tank 20 has a storage space 24 having a rectangular cross section inside, and a lid 26 is attached to the upper part. With such a configuration, the powder 12 accommodated in the accommodation space 24 so as to be filled with the powder 12 is prevented from being scattered outside. Further, a spray roller 22 having a diameter smaller than the width of the storage space 24 is disposed in a rectangular state at a lower portion of the powder storage tank 20 in a horizontal state with a lower half portion exposed to the outside.

  Then, a doctor blade 28 arranged so as to narrow the tip opening width in a V-shape is attached to the lower outer edge of the powder storage tank 20 by a pressing plate 29 so that the tip blade contacts the both side surfaces of the spraying roller 22. It is extended. Thus, the doctor blade 28 fills the gap between the spray roller 22 and the lower opening of the storage space 24 of the powder storage tank 20 and is in close contact with the outer surface of the spray roller 22.

The spreading roller 22 is formed in a hollow cylindrical body, and a large number of recesses 23 for accommodating the powder 12 are formed on the outer surface thereof.
Since the amount of the powder 12 conveyed / discharged by the spray roller 22 is determined by the size of the recess 23, the size of the recess 23 may be reduced when performing a small amount of spraying, for example, depending on the application.

  The spreading roller 22 rotates as indicated by an arrow 21 so that the powder 12 adhering to the recess 23 is scraped off by a doctor blade 28 to a predetermined layer thickness and conveyed to the lower part of the spreading roller 22. A drive motor (not shown) such as a gear motor for rotating the spray roller 22 is connected to one end side of the spray roller 22. The spreading roller 22 can arbitrarily set and change the peripheral speed by an inverter.

  The brush rollers 30 are respectively attached so as to sandwich both side surfaces of the spraying roller 22 along the flow direction of the sprayed body 11. The brush roller 30 shown in FIG. 1 includes a first brush roller 32 and a second brush roller 34. A drive motor (not shown) such as a gear motor for rotating the brush roller 30 is connected to one end side of the brush roller 30. The brush roller 30 can arbitrarily change the peripheral speed by an inverter. Further, the brush roller 30 can arbitrarily set and change the thickness, material, length of bristle, shape, etc. of the brush according to the type of powder and the amount of application. As an example, the brush roller 30 is wound around a shaft with a brush caulked by a channel. For this reason, the winding pitch interval can be arbitrarily set and changed. According to the brush roller having such a configuration, it is possible to make the powder scraping uniform according to the type of powder and the amount of spraying, and to prevent unevenness of spraying.

  The first brush roller 32 is disposed so that the brush contacts the roller surface of the spreading roller 22. The first brush roller 32 is rotated in the same direction as the spreading roller 22 as indicated by an arrow 33. The first brush roller 32 rotates as indicated by an arrow 33 to come into contact with the roller surface of the spreading roller 22 and scrape off the powder 12 adhering to the recess 23 formed on the roller surface. It is made to spread on the upper surface of the spreader 11.

  The second brush roller 34 is disposed on the opposite side of the first brush roller 32 with the spreading roller 22 as the center. The second brush roller 34 is disposed so as to be in contact with or close to the doctor blade 28. The second brush roller 34 is rotated in the direction opposite to the spreading roller 22 as indicated by an arrow 35. The second brush roller 34 rotates as indicated by an arrow 35 to scrape the powder before adhering and growing into the spraying closed space in contact with or close to the blade surface of the doctor blade 28. As a result, it is possible to prevent so-called “bottom dropping”, in which the powder adhering to the blade clumps and adheres and falls.

  The space partition rollers 40 are attached so as to be in contact with the side surfaces of the brush roller 30 along the flow direction of the object to be spread 11. The space partition roller 40 shown in FIG. 1 is in contact with the first space partition roller 42 disposed on the side opposite to the side where the first brush roller 32 contacts the spray roller 22 and the spray roller 22 of the second brush roller 34. It is comprised from the 2nd space partition roller 44 arrange | positioned on the opposite side to the side to perform.

  The first space partition roller 42 has a rotation direction opposite to that of the first brush roller 32 and is configured to repel the powder of the first brush roller 32 attached when the powder of the spraying roller 22 is scraped off. doing.

The second space partition roller 44 has a rotation direction opposite to that of the second brush roller 34, and repels the powder of the second brush roller 34 attached when the powder attached to the doctor blade is scraped off. It is composed.
The first and second space partition rollers 42 and 44 are arranged so that a gap of about 2 to 5 mm is formed from the surface of the object 11 to be spread. For this reason, scattering of powder can be prevented. The first and second space finishing rollers 42 and 44 can form the spraying closed space 36 together with the brush roller 30 immediately below the spraying roller 22.

  Both ends of the shaft of the space partition roller 40 are supported by one end of a pair of support bars 46 so as to be freely rotatable. The other end of the support bar 46 is rotatably supported by the support 56. The space partition roller 40 having such a configuration makes its roller surface contact the brush surface of the brush roller 30 by its own weight.

  The space partition roller 40 has a gear motor section for rotation therein, and is designed to save space. The space partition roller 40 can arbitrarily change the peripheral speed by an inverter. The surface of the space partition roller 40 is formed smoothly.

  The detachable part 50 supports the shaft of the brush roller 30 and supports the support bar 46 of the space partition roller 40, and moves the support 56 forward and backward toward the spraying roller 22 along the transport direction of the sprayed object 11. The cylinder part 58 to be made has a main basic configuration. The support 56 is also provided with a drive motor (not shown) for the brush roller 30. The attachment / detachment unit 50 includes a first attachment / detachment unit 52 that moves the first brush roller 32 and the first space partition roller 42 forward and backward toward the spray roller 22, and a second brush roller 34 and the second space partition roller 44 that serve as the spray roller 22. And a second attaching / detaching portion 54 that moves forward and backward.

  FIG. 2 is an explanatory view when the powder spraying device of the first embodiment is stopped. As shown in the figure, by reducing the cylinder part 58 of the attaching / detaching part 50, the brush roller 30 is separated from the spraying roller 22, and a gap serving as a work space is formed between the rollers. As a result, maintenance such as inspection, repair, and replacement of each roller can be performed.

  With the attachment / detachment section 50 having such a configuration, the brush roller 30 and the space partition roller 40 are moved forward and backward along the conveyance direction of the sprayed body 11 from one and the other side with the spraying roller 22 as the center to attach / detach the brush. Can do. Further, by adjusting the amount of forward / backward movement by the attaching / detaching unit 50, the contact pressure of the brush roller 30 brought into contact with the spray roller 22 can be adjusted to prevent spray unevenness.

The controller 60 is electrically connected to driving means (not shown) for the spreading roller 22, the brush roller 30, and the space partition roller 40. The controller 60 can control the amount of powder sprayed by arbitrarily controlling the number of rotations of the spray roller 22, the brush roller 30, and the space partition roller 40.
The amount of contact between the brush roller 30 and the spray roller 22 can be mechanically adjusted to prevent uneven powder 12 dispersion.

  The powder spraying device of the present invention having the above configuration operates as follows. When the spray roller 22 is rotated as shown by an arrow 21 by a drive motor (not shown), the powder in the powder storage tank 20 is uniformly attached to the recess 23 formed on the surface of the spray roller 22 by the action of the doctor blade 28, It is carried to the lower part of the spreading roller 18.

  When the powder 12 adhering to the concave portion 23 of the spreading roller moves to the first brush roller 32, the powder 12 is scraped and separated from the concave portion 23 by the brush of the first brush roller 32, and the object to be spread 11 below is scattered. It is sprayed on the top surface. At this time, since the recesses 23 are formed on the entire circumferential surface of the spraying roller 22, the recesses 23 can be sprayed uniformly on the sprayed object 11.

  In addition, the second brush roller 34 that is in contact with or close to the blade surface of the doctor blade 28 scrapes off the powder 12 before adhering and growing on the blade into the spraying closed space. As a result, it is possible to prevent the powder adhering to the doctor blade 28 from growing and forming a lump, dropping onto the upper surface of the object 11 to be spread and causing the amount of spread to be non-uniform.

  On the other hand, the space partition roller 40 is in contact with the roller surfaces of the pair of brush rollers 30 and is rotated in the opposite direction to the brush roller 30. Thus, since the spraying closed space 36 is formed on the lower surface of the spraying roller 22, the powder 12 scraped off from the spraying roller 22 remains in the spraying closed space 36 and does not scatter outside. Further, the powder 12 of the brush roller 30 adhering to the scraping roller 22 is scraped off from the surface of the brush by the space partition roller 40 that rotates in the direction opposite to the brush roller, and the upper surface of the object 11 to be scattered below. Fall into. At this time, the powder 12 adhering to the space partition roller 40 itself is also removed by the brush. For this reason, it is possible to prevent the powder from adhering to the brush roller or the space partitioning roller 40 and growing to form a lump and dropping down to the upper surface of the sprayed object 11.

  The controller 60 is electrically connected to the driving means for the spraying roller 22, the brush roller 30, and the space partition roller 40, and can arbitrarily control the peripheral speed of each roller according to the type of powder and the amount of spraying. it can. Generally, the peripheral speed of the spraying roller 22 is determined according to the transport speed of the sprayed object 11. The brush roller 30 and the space partition roller 40 can be set to an arbitrary peripheral speed according to the peripheral speed of the spreading roller.

  In the present embodiment, as an example, the circumferential speed is set to increase in the order of the space partition roller 40, the brush roller 30, and the spraying roller 22 from the top. According to the setting of the control unit 60, between the space partition roller 40 and the brush roller 30, the space partition roller 40 comes into contact with the brush roller 30 by its own weight to disperse the powder adhering to the brush in the spraying closed space 36. The powder is always removed by the brush roller 30 in the space partition roller 40, and the powder adhering to each other can be removed effectively. Therefore, the powder does not grow and become a lump, and it can be prevented that the powder drops and uneven dispersion occurs. Further, between the brush roller 30 and the spraying roller 22, the powder 12 adhering to the spraying roller can be evenly scraped off due to the difference in rotational speed.

  According to such a powder spraying device 10 of the present invention, the powder adhering to the recess 23 of the spraying roller 22 is scraped off by the brush roller 30 so that the powder can be uniformly sprayed on the object to be sprayed. . Further, by rotating the brush roller 30 in contact with the doctor blade 28, it is possible to prevent the lump of the powder adhering to the doctor blade 28 from growing up and dropping, resulting in uneven dispersion. In addition, the amount of powder applied can be arbitrarily adjusted.

  FIG. 3 is a diagram showing a schematic configuration of the powder spraying apparatus according to the second embodiment. As shown in the figure, the powder spraying device 100 according to the second embodiment has the second brush roller 34 in contact with the roller surface of the spraying roller 22. That is, the first and second brush rollers 32 and 34 and the first and second space partition rollers 42 and 44 are arranged symmetrically with respect to the spreading roller 22. In the present embodiment, when scraping becomes insufficient with only the first brush roller 32 due to the influence of the type of powder and the amount of spraying, stable spraying is possible by scraping the second brush roller 34 as well. Other configurations are the same as those of the powder spraying apparatus according to the first embodiment, and detailed description thereof is omitted.

  FIG. 4 is an explanatory view when the powder spraying device of the second embodiment is stopped. As shown in the figure, by reducing the cylinder part 58 of the attaching / detaching part 50, the brush roller 30 is separated from the spraying roller 22, and a gap serving as a work space is formed between the rollers. As a result, maintenance such as inspection, repair, and replacement of each roller can be performed.

  According to the powder spraying device 100 of the second embodiment having the above configuration, the powder adhering to the concave portion 23 of the spraying roller 22 is scraped off by the brush roller 30 similarly to the powder spraying device of the first embodiment. , Can be evenly sprayed on the object. Further, even if the powder adhering to the blade of the doctor blade 28 is lumped as a lump, it is introduced between the second brush roller 32 and the spraying roller 22 and scraped off from the roller surface so that it is uniformly applied to the sprayed object 11. Can be applied.

DESCRIPTION OF SYMBOLS 10,100 ......... Powder dispersion | spreading apparatus, 11 ..... to-be-spread body, 12 ....... powder, 20 ....... powder storage tank, 22 ..... spreading roller, 23 .......... concave, 24 ... ...... Accommodating space, 26... Lid, 28... Doctor blade, 29... Press plate, 30... Brush roller, 32 ... First brush roller, 34. 36 ......... Spreading closed space, 40 ......... Space partition roller, 42 ......... First space partition roller, 44 ......... Second space partition roller, 46 ......... Support bar, 50 ......... Removable part, 52... First attaching / detaching portion 54... Second attaching and detaching portion 56... Support 58 ...... Cylinder portion 60.

Claims (6)

A powder spraying device that rotates a spraying roller disposed in a lower part of the powder storage tank and sprays the powder adhering to the roller surface of the spraying roller onto the sprayed object passing under the spraying roller. And
A concave portion that is formed on the surface of the spraying roller, is arranged in a plurality along the roller axial direction and the circumferential direction, and is distributed and accommodated on the entire surface of the roller to discharge the powder from the powder storage tank,
A pair of brush rollers in contact with the roller surface from both sides of the spreading roller;
A pair of space partition rollers that are in contact with the brush of the brush roller and form a spraying closed space between the object to be sprayed;
A powder spraying device comprising: The brush roller is
A first brush roller that contacts the recess and rotates in the same direction as the spreading roller;
A second brush roller that rotates in the opposite direction to the spray roller in contact with or in close proximity to the doctor blade of the spray roller;
The powder spraying device according to claim 1, comprising:   The powder spraying device according to claim 1, further comprising an attaching / detaching unit that moves the brush roller and the space partition roller forward and backward toward the spraying roller along a conveying direction of the sprayed object. .   4. The apparatus according to claim 1, further comprising a control unit that is electrically connected to a driving unit of the spray roller and the brush roller to increase a peripheral speed of the brush roller as compared with the spray roller. The powder disperser according to item.   The powder spraying device according to any one of claims 1 to 4, wherein the space partition roller is in contact with the brush roller and rotated in a reverse direction.   5. The powder spraying device according to claim 4, wherein the control unit is electrically connected to a driving unit of the space partition roller to set a peripheral speed of the space partition roller faster than the brush roller. .

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