JP5191239B2 - Spraying equipment - Google Patents

Description

  The present invention relates to a spraying device that atomizes a liquid agent using a centrifugal force and sprays it.

  In Patent Document 1, as a means for spraying a release agent on the molding surfaces of both molds in a state where the fixed mold and the movable mold are opened, the spray directions are opposite to each other between the molds. Disposing a spraying device having a pair of nozzles oriented, spraying the release agent discharged from one nozzle in a atomized form toward a fixed mold, and discharging from the other nozzle in a atomized form A structure for spraying an agent toward a movable mold is disclosed.

However, in this spraying device, the nozzle dedicated to the fixed mold and the nozzle dedicated to the movable mold are separately provided, and the structure becomes complicated. Therefore, it is conceivable to use a spray device using a rotary atomizing head. The rotary atomizing head has a diffusion surface recessed in a dish shape on the front, and moves the liquid release agent supplied to the diffusion surface radially outward on the diffusion surface using centrifugal force. It is thinned while being spread, and is atomized when discharged radially from the outer peripheral edge of the diffusion surface.
The rotary atomizing head having such a configuration is inserted between the fixed mold and the movable mold that are opened, and the rotational axis of the rotary atomizing head is set to the mold release direction of the fixed mold and the movable mold. If the direction is orthogonal, it is possible to spray the release agent simultaneously on both the fixed mold and the movable mold.
JP 2005-34845 A

  In order to atomize the release agent uniformly in this type of rotary atomizing head, it is necessary to extend the release agent as thinly as possible on the diffusion surface, and in order to extend the release agent thinly, the diffusion surface It is necessary to increase the moving distance in the radial direction of the release agent. However, in order to ensure a long moving distance of the release agent, the outer diameter of the diffusion surface has to be increased, so that the rotary atomizing head is enlarged. When spraying using a large rotary atomizing head in order to achieve uniform atomization in this way, it is necessary to ensure a large distance between the fixed mold and the movable mold in the mold open state.

  However, the space to be secured between the fixed mold and the movable mold when the mold is opened is sufficient if there is a size necessary for taking out the molded product formed by both molds. When a rotary atomizing head with a large diameter is applied to a mold for manufacturing a product to achieve uniform atomization, a gap between the fixed mold and the movable mold is required when the mold is opened. As a result, the space required for the installation of the mold increases. In addition, when a large gap between the two dies at the time of mold opening cannot be secured, a rotary atomizing head having a large diameter cannot be used in order to achieve uniform atomization.

  The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a spraying apparatus that can spray a liquid agent even in a narrow space while allowing the liquid agent to be uniformly atomized. And

As means for achieving the above object, the invention of claim 1 is provided with a rotary atomizing head at a front end portion, and the liquid agent supplied to the rotary atomizing head is atomized from an outer peripheral edge of the rotary atomizing head. is intended to spray and released state, the rotary atomizing head, said supply and supply chamber which liquid is supplied, at a position eccentric from the rotation center of the rotary atomizing head communicated with said supply chamber a supply passage to outside the opening of the chamber, the disposed so as to open facing the supply channel, in the spray apparatus liquid from the outer peripheral edge is formed and a diffusion surface which is released in a state of being atomized The diffusion surface is substantially perpendicular to the rotation center of the rotary atomizing head, and the supply path is opened at a substantially right angle with respect to the diffusion surface, the discharge unit, and the supply Placed at a right angle to the center of rotation of the rotary atomizing head It is configured in a bent path by an accelerating portion extending in the radial direction at a close angle, and the liquid agent supplied to the supply chamber collides with the diffusion surface from the discharge portion while being accelerated in the accelerating portion. However, it is characterized in that it is extended thinly at a stretch on the diffusion surface by the momentum of this collision .

The invention according to claim 2 is the one according to claim 1 , wherein the diffusion surface is located at the front end of the rotary atomizing head and faces backward, and behind the rotary atomizing head, It is characterized in that a pair of air ejection portions for ejecting air forward from two positions across the rotation center of the rotary atomizing head is provided along the outer periphery of the rotary atomizing head.

<Invention of Claim 1>
The liquid agent in the supply chamber is supplied so as to collide with the diffusion surface from the supply path by centrifugal force, and is thinly extended on the diffusion surface by the force of the collision, and is atomized and sprayed from the outer periphery of the diffusion surface. The According to the present invention, since the liquid agent can be extended thinly without being moved in the radial direction on the diffusion surface, it is possible to keep the outer diameter of the diffusion surface small and even in a narrow space. Good atomization can be performed by atomization.

In addition, since the diffusion surface is a surface that is substantially orthogonal to the rotational center of the rotary atomizing head, the liquid discharged toward the diffusion surface diffuses quickly while being thinned outward in the radial direction by centrifugal force. To do. Since the liquid agent does not easily stay on the diffusion surface, the liquid agent is thinly extended and atomization is promoted. In addition, since the supply path is opened in a direction substantially parallel to the rotation center of the rotary atomizing head, that is, substantially perpendicular to the diffusion surface, the momentum of the collision of the liquid agent against the diffusion surface is not attenuated.

Further, since the liquid agent in the supply chamber is sufficiently accelerated by the centrifugal force while passing through the accelerating portion and is discharged toward the diffusion surface under pressure from the discharge portion, the momentum of collision with the diffusion surface is increased. . Thereby, a liquid agent is extended thinly enough and favorable atomization is performed.

<Invention of Claim 2 >
The air ejected from the pair of air outlets along the outer periphery of the rotary atomizing head becomes an air flow divided into two hands and collides with the diffusion surface. And flow radially outward along the outer peripheral edge of the diffusion surface and discharged in opposite directions. At this time, in the region corresponding to the two air flows in the outer peripheral edge of the diffusion surface, the atomized liquid agent is caught in the corresponding air flow, and in the region not corresponding to the air flow in the outer peripheral edge of the diffusion surface. The atomized liquid is sucked into one of the two air streams. Thereby, the liquid agent in an atomized state is discharged in opposite directions by multiplying the air flow divided into two hands.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The spraying apparatus A of this embodiment is a form in which the rotary atomizing head 20 is rotatably provided at the front end of the main body 10. In the main body 10, a rotating shaft 11 having a cylindrical shape whose axis is directed in the front-rear direction is supported by a well-known air turbine mechanism (not shown) so as to be able to rotate at a high speed. The front end portion protrudes forward from the front end surface of the main body portion 10. Further, the main body 10 is provided with a supply pipe 12 for supplying the release agent B (liquid agent which is a constituent of the present invention) to the rotary atomizing head 20 in a fixed manner. The supply pipe 12 has a cylindrical shape whose axis is directed in the front-rear direction, is concentrically accommodated inside the rotary shaft 11, and the front end portion of the supply pipe 12 projects forward from the front end of the rotary shaft 11. Yes.

  In addition, an air supply space 13 that is concentric with the rotating shaft 11 is formed at the front end in the main body 10, and the air supply space 13 communicates with the front end surface of the main body 10. A plurality of air flow paths 14 are formed, and front ends of the plurality of air flow paths 14 are opened as jets 15 on the front end surface of the main body 10. As shown in FIG. 2, the plurality of jet nozzles 15 are arranged along two arcs that are concentric with the axis of the rotating shaft 11 and symmetrical with respect to the axis of the rotating shaft 11. In addition, the formation range of each arrangement region in the circumferential direction extends over an angle range of about 90 °. Each of the plurality of jet nozzles 15 arranged separately on the right side and the left side constitutes an air jet part 16 having an arc shape concentric with the rotation shaft 11. In addition, the direction of each air flow path 14 (the opening direction of the ejection port 15) is inclined with respect to the axis of the rotary shaft 11 so as to approach the axis of the rotary shaft 11 toward the front.

The rotary atomizing head 20 is configured by assembling a cylindrical member 21, a front member 22, and a closing member 23, and is attached concentrically to the rotary shaft 11.
The cylindrical member 21 is concentric with the rotary atomizing head 20 and has a cylindrical shape whose axis is directed in the front-rear direction. A front mounting hole 24 is formed at the front end of the cylindrical member 21, with the front end face notched in a concentric circle, and a locking groove 25 is formed on the inner periphery of the front mounting hole 24. A rear mounting hole 26 is formed at the rear end of the cylindrical member 21, with the rear end face notched in a concentric circle, and a female screw hole is formed on the inner periphery of the rear mounting hole 26. In addition, a communication hole 27 is formed in the tubular member 21 so that the front mounting hole 24 and the rear mounting hole 26 communicate with each other. The communication hole 27 has a circular shape concentric with the cylindrical member 21, and has an inner diameter smaller than that of the front mounting hole 24 and the rear mounting hole 26.

  The opening edge of the front end of the front mounting hole 24 has an annular shape that is concentric with the cylindrical member 21 and is tapered with an inclination with respect to the axis of the cylindrical member 21 so as to increase in diameter toward the front. The surface 28 is continuously formed over the entire circumference. Further, a tapered surface 29 that is concentric with the cylindrical member 21 and is inclined with respect to the axis of the cylindrical member 21 so as to increase in diameter toward the front is turned on the front end surface of the cylindrical member 21. It is formed continuously over the entire circumference along the outer peripheral edge of the surface 28. The inclination angle of the tapered surface 29 with respect to the axis of the cylindrical member 21 is larger than the inclination angle of the turning surface 28. In other words, the tapered surface 29 forms an angle close to a right angle with the axis of the cylindrical member 21, whereas the turning surface 28 forms an angle close to the axis of the cylindrical member 21.

  The front member 22 has a circular disc portion 30 that is concentric with the rotary atomizing head 20 and has an axial line directed in the front-rear direction, a cylindrical projecting portion 31, and a flange portion 32. A plurality of acceleration portions 33 having a hole shape penetrating from the rear end surface to the outer peripheral surface are formed in the disk portion 30. The openings on the outer peripheral surface and the openings on the rear end surface of the plurality of acceleration parts 33 are all arranged at a constant pitch along a circle concentric with the front member 22. Moreover, the penetration direction of the acceleration part 33 is diagonal with respect to the axis line of the front member 22, and the angle is an angle close to a right angle with the axis line.

  The cylindrical projecting portion 31 is configured to project rearward from the outer peripheral edge of the rear end portion of the front member 22 so as to form a cylindrical shape concentric with the disk portion 30. The formation region of the cylindrical protrusion 31 is on the outer peripheral side of the opening region of the acceleration portion 33 on the rear end surface of the disk portion 30. A locking groove 34 is formed on the outer periphery of the cylindrical protrusion 31.

  The flange portion 32 projects concentrically outward in the radial direction so as to be flush with the front end surface of the disc portion 30 from the outer periphery of the disc portion 30, and the outer diameter of the flange portion 32 is the cylindrical member 21. The dimension is larger than the outer diameter. The front end surface of the flange portion 32 is perpendicular to the axis of the front member 22. The rear surface of the flange portion 32 is a diffusing surface 35 that is concentric with the front member 22. An inner concentric annular region connected to the outer periphery of the disk portion 30 in the diffusing surface 35 is a collision surface 36 having a tapered shape close to a right angle with the axis of the front member 22. The collision surface 36 is substantially parallel to the tapered surface 29 of the cylindrical member 21. On the other hand, the outer concentric annular region connected to the outer peripheral edge of the diffusing surface 35 is a flow surface 37 formed of a flat surface perpendicular to the axis of the front member 22. A circle serving as a boundary between the flow surface 37 and the collision surface 36 has substantially the same size as the outer diameter of the front end portion of the cylindrical member 21.

  The closing member 23 has a disk shape concentric with the rotary atomizing head 20, and the closing member 23 is formed with a concave portion 38 having a front surface recessed in a concentric circular dish shape. Further, the closing member 23 is formed with a concentric circular through-hole 39 having a shape penetrating the center portion in the front-rear direction. The inner diameter of the through hole 39 is slightly larger than the outer diameter of the front end portion of the supply pipe 12.

  The closing member 23 is assembled to the front member 22 in a press-fitted state so as to be fitted to the inner periphery of the cylindrical protruding portion 31 from the rear. In a state where the closing member 23 is assembled to the front member 22, a circular supply chamber 40 surrounded by the rear end surface of the disk portion 30 and the recess 38 is formed concentrically with the rotary atomizing head 20. Further, the front member 22 to which the closing member 23 is assembled is assembled to the cylindrical member 21 so that the cylindrical protruding portion 31 is fitted into the front mounting hole 24 from the front. In the assembled state, the front member 22 and the cylindrical member 21 are detached in the front-rear direction by engaging the locking ring 41 with the locking groove 25 of the cylindrical member 21 and the locking groove 34 of the front member 22. Is restricted, and the cylindrical member 21 and the front member 22 are locked in the assembled state. Further, the cylindrical member 21 and the front member 22 are positioned in the front-rear direction by the locking action of the locking grooves 25 and 34 and the locking ring 41.

  In the state in which the front member 22 and the cylindrical member 21 are assembled, the turning surface 28 of the cylindrical member 21 is opposed to the outer peripheral surface of the cylindrical protruding portion 31 in the radial direction, and is a substantially triangular cross section that opens forward by both surfaces. The discharge part 42 is formed. The discharge part 42 is opened forward so as to form an annular shape which is continuous at an angle nearly parallel to the axis of the rotary atomizing head 20 and over the entire circumference. In the discharge part 42, openings of a plurality of acceleration parts 33 face. In other words, the openings of the acceleration part 33 are diagonally opposed to the turning surface 28. Further, a collision surface 36 of the diffusing surface 35 is positioned in the vicinity of the front of the discharge portion 42 that opens forward. The flow surface 37 of the diffusing surface 35 is located on the outer peripheral side with respect to the discharge portion 42, and the discharge portion 42 and the flow surface 37 do not directly face each other. In a state where the front member 22 and the cylindrical member 21 are assembled, a bent path for supplying the release agent B in the supply chamber 40 to the diffusion surface 35 by the discharge unit 42 and the plurality of acceleration units 33. The supply path 43 is configured. The discharge part 42 of the supply path 43 opens to the outside of the supply chamber 40 at a position eccentric from the rotation center of the rotary atomizing head 20.

  The rotary atomizing head 20 having the above configuration is attached to the main body 10 so as to be rotatable relative to the main body 10. At the time of attachment, the front end portion of the rotary shaft 11 and the front end portion of the supply pipe 12 are inserted into the rear attachment hole 26, and the rear attachment hole 26 is fixed to the front end portion of the rotary shaft 11 by screwing. As a result, the rotary atomizing head 20 can rotate at a high speed relative to the main body 10 together with the rotary shaft 11. Further, the front end portion of the supply pipe 12 passes through the through hole 39, and the opening at the front end of the supply pipe 12 faces the supply chamber 40. Further, in a state where the rotary atomizing head 20 is assembled to the main body 10, the pair of left and right air ejection portions 16 are divided into a left position and a right position with respect to the rotary atomizing head 20, and the rotary atomizing head 20 are arranged in a concentric arc shape. The opening direction of the air ejection portion 16 is directed to the outer peripheral front end portion of the cylindrical member 21 of the rotary atomizing head 20.

Next, the operation of this embodiment will be described.
As shown in FIGS. 8 and 9, the spray device A is used to apply a release agent B to the fixed mold Da and the movable mold Db arranged in the horizontal direction. When applying, in a state where the fixed mold Da and the movable mold Db are opened in the left-right direction and separated in the horizontal direction, the rotary atomizing head 20 (spraying device A) is placed between the two molds Da, Db. Let it enter. The axis of the rotary atomizing head 20 at this time is a horizontal direction, that is, a direction perpendicular to the mold opening direction of both molds Da and Db. And while rotating the atomizing head 20 in the state which made the rotary atomizing head 20 approach between both metal mold | die Da, Db, while supplying the mold release agent B to the rotating atomizing head 20, air Air is ejected from the ejection part 16.

  The release agent B is supplied into the supply chamber 40 through the supply pipe 12, and in the supply chamber 40, the release agent B moves to the outer peripheral side due to the centrifugal force generated by the rotation of the rotary atomizing head 20, and the supply path It flows into the acceleration part 33 of 43. In the accelerating portion 33, the release agent B moves radially outward due to centrifugal force, but the moving direction of the release agent B in the accelerating portion 33 is perpendicular to the rotation center of the rotary atomizing head 20. Near the angle, that is, almost the same direction as the centrifugal force. Therefore, the release agent B is sufficiently accelerated and pressurized in the acceleration unit 33.

  The release agent B accelerated in the acceleration unit 33 flows into the discharge unit 42 and hits the turning surface 28. The release agent B that has hit the turning surface 28 is supplied to the collision surface 36 of the diffusing surface 35 while changing the moving direction from radially outward to forward. At this time, the release agent B is sufficiently accelerated, and the collision surface 36 is a surface that is nearly perpendicular to the discharge direction of the release agent B from the discharge portion 42. Will collide with the collision surface 36 vigorously. Due to the momentum of this collision, the release agent B is stretched thinly on the diffusion surface 35 at a stretch.

  The release agent B that is thinly extended on the collision surface 36 moves quickly onto the outer peripheral flow surface 37 due to the centrifugal force and the inclination of the collision surface 36, and the release agent B is thinly extended on the flow surface 37. In the stretched state, it reaches the outer peripheral edge of the diffusion surface 35 (fluid surface 37), and is discharged radially outward in a state of being atomized (atomized) from the outer peripheral edge of the diffusion surface 35 by centrifugal force. The

  Further, from the pair of air ejection portions 16 provided at the left and right positions sandwiching the rotation center of the rotary atomizing head 20 behind the rotary atomizing head 20, the air is forwarded along the outer periphery of the rotary atomizing head 20. Is ejected. The air ejected from the pair of air jets 15 along the outer periphery of the rotary atomizing head 20 becomes an air flow divided into two left and right hands, collides with the diffusion surface 35, and remains divided into two hands. Thus, it flows radially outward (that is, in the left-right direction) along the diffusing surface 35, and is discharged from the outer peripheral edge of the diffusing surface 35 as it is divided in opposite directions (that is, in the left-right direction).

  At this time, in the left region and the right region corresponding to the two air flows in the outer peripheral edge of the diffusing surface 35, the atomized liquid agent is caught in the corresponding air flow. On the other hand, in the upper and lower regions of the outer peripheral edge of the diffusing surface 35 that do not correspond to the air flow, the atomized liquid agent is sucked into one of the left and right air flows. Thereby, the liquid agent discharged in an atomized state from the outer peripheral edge of the diffusing surface 35 to the entire circumference is discharged in opposite directions by multiplying the air flow divided into left and right hands.

  In this way, the release agent B in the atomized state divided into left and right is separately applied to the molding surface of the fixed mold Da and the molding surface of the movable mold Db. Since the release agent B is not released in the vertical direction, the amount of the release agent B that is wasted without being applied to the molds Da and Db can be reduced.

  The rotary atomizing head 20 of the present embodiment communicates with the supply chamber 40 to which the release agent B is supplied and the supply chamber 40 and is located outside the supply chamber 40 at a position eccentric from the rotation center of the rotary atomizing head 20. An opening supply path 43 and a diffusion surface 35 disposed so as to face the supply path 43 are provided. Then, the release agent B in the supply chamber 40 is supplied so as to collide with the diffusion surface 35 from the supply path 43 by centrifugal force, and is thinly extended on the diffusion surface 35 due to the momentum of the collision. Atomized from the outer periphery of the surface 35 and sprayed. According to the present embodiment, the release agent B can be thinly extended without being moved long in the radial direction on the diffusion surface 35, so that the outer diameter of the diffusion surface 35 can be kept small. Even in a narrow space, uniform atomization can be performed and good spraying can be performed.

Further, since the diffusing surface 35 is a surface substantially orthogonal to the rotation center of the rotary atomizing head 20, the release agent B discharged toward the diffusing surface 35 extends thinly outward in the radial direction by centrifugal force. It can diffuse quickly toward the outer periphery while being stretched. Thus, since the release agent B is less likely to stay on the diffusion surface 35, the release agent B is thinly extended and atomization is promoted.
Further, since the supply path 43 opens in a direction substantially parallel to the rotation center of the rotary atomizing head 20, that is, at a substantially right angle with respect to the diffusion surface 35, the momentum of the release agent B colliding with the diffusion surface 35 is increased. It is not attenuated.

  Further, the supply path 43 is arranged between the discharge part 42 that opens to face the diffusion surface 35, and between the discharge part 42 and the supply chamber 40, and intersects the rotation center of the rotary atomizing head 20. And an accelerating portion 33 extending in the radial direction. With this configuration, the release agent B in the supply chamber 40 is sufficiently accelerated by the centrifugal force while passing through the accelerating unit 33, and is discharged toward the diffusion surface 35 in a pressurized state from the discharge unit 42. The momentum of collision with the diffusing surface 35 is strengthened. Thereby, the mold release agent B is extended sufficiently thinly, and favorable atomization is performed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the case where the liquid agent is a mold release agent has been described in the above embodiment, the present invention is a liquid agent other than a paint (for example, paint, lubricating oil, insecticide, insecticide, disinfectant, waterproofing agent, rust prevention). It can also be applied to agents.
(2) Although the case where the spray target is a mold has been described in the above embodiment, the present invention can also be applied to a case where the spray target is other than a mold (for example, an object to be coated, a machine part, a plant, or the like). .
(3) In the above embodiment, the discharge portion of the supply passage opens forward and the diffusion surface faces rearward. However, the discharge portion opens rearward and the diffusion surface faces forward. It is good also as a form to do .
(4) In the above embodiment, spraying is performed with the rotation axis of the rotary atomizing head set in the horizontal direction, but the direction of the rotary axis of the rotary atomizing head intersects the mold opening direction of both molds. As long as it is a direction to perform, it may be a vertical direction or an oblique direction.
(5) In the above-described embodiment, the air outlet is configured by arranging a plurality of outlets that are opened in a circular shape in an arc shape, but the air outlet may be an outlet that is elongated in an arc shape. . In this case, a plurality of arc-shaped air outlets may be arranged in an arc shape.
<Reference example>
(1) In the above embodiment, the discharge portion of the supply path opens forward and the diffusion surface faces rearward. However, the discharge portion opens radially outward and the diffusion surface is radial. It is good also as the form which faces inside.
(2) In the above embodiment, the supply path is bent so that the discharge section to the outside of the supply path and the acceleration section excluding the discharge section are in different directions, but the supply path extends over the entire length of the supply path. The shape may extend in a straight line.

Sectional drawing of the spraying apparatus of Embodiment 1. Front view of spraying device Cross section of rotary atomizing head Rear view of rotating atomizing head Cross-sectional view of a cylindrical member constituting the rotary atomizing head Sectional view of the front member constituting the rotary atomizing head Rear view of front member Front view showing a state where a mold release agent is applied to a mold using a spraying device A plan view showing how a release agent is applied to the mold using a spraying device

Explanation of symbols

A ... Spraying device B ... Release agent 16 ... Air outlet 20 ... Rotating atomizing head 33 ... Accelerating part 35 ... Diffusion surface 40 ... Supply chamber 42 ... Discharge part 43 ... Supply path

Claims (2)

The front end is provided with a rotary atomizing head, and the liquid agent supplied to the rotary atomizing head is discharged and sprayed in a state of being atomized from the outer peripheral edge of the rotary atomizing head ,
The rotary atomizing head is
A supply chamber to which a liquid agent is supplied;
A supply path communicating with the supply chamber and opening to the outside of the supply chamber at a position eccentric from the rotation center of the rotary atomizing head;
In the spraying device that is arranged to face the opening of the supply path and is configured to include a diffusion surface that is discharged in a state where the liquid agent is atomized from the outer peripheral edge ,
The diffusion surface is in a form substantially orthogonal to the rotation center of the rotary atomizing head,
The supply path is disposed between the discharge unit and the supply chamber, the discharge unit being opposed to the diffusion surface at a substantially right angle, and at an angle close to a right angle with the rotation center of the rotary atomizing head. It is composed of a bent path with an acceleration part extending in the radial direction,
The liquid agent supplied to the supply chamber collides with the diffusion surface from the discharge unit while being accelerated in the acceleration unit, and is stretched thinly on the diffusion surface at once by the momentum of the collision. A spraying device characterized by. The diffusion surface is located at the front end of the rotary atomizing head and faces backward,
Behind the rotary atomizing head, there are provided a pair of air jetting units for jetting air forward from two positions across the rotation center of the rotary atomizing head along the outer periphery of the rotary atomizing head. spray apparatus according to claim 1, wherein the are.

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