JP2009202070A - Feeding device of mixed coating material - Google Patents

Abstract

An object of the present invention is to provide a paint having no mixed spots even after the supply of the paint is interrupted.
A common supply path having a downstream end of a main agent supply path and a downstream end of a curing agent supply path connected to an upstream end, and a static mixer connected to a downstream end of the common supply path. The mixed paint obtained by mixing the main agent and the curing agent alternately supplied to the upstream end of the common supply path 12 in the process of passing through the common supply path 12 and the static mixer 13 is applied to the coating gun. 14. The common supply path 12 has a configuration in which a plurality of low flow paths 27 and a plurality of high flow paths 28 arranged at higher positions than the plurality of low flow paths 27 are alternately arranged. Figure 1

Description

  The present invention relates to a mixed paint supply apparatus.

Patent Document 1 discloses an apparatus for supplying a paint obtained by mixing a main agent and a curing agent. This apparatus has a structure in which a main agent supply path and a curing agent supply path are connected to the upstream end of the common supply path, and a static mixer is connected to the downstream end of the common supply path, and the main agent and the curing agent are connected to the common supply path. It is designed to be inserted alternately. The alternating main agent curing agent is changed from a block shape to a layer film shape due to a difference in flow rate between a region near the inner wall of the shared supply path and a region far from the inner wall in the process of passing through the shared supply path, In the process of passing through the static mixer, it is agitated and mixed to become a paint.
JP 2007-144286 A

Since the main agent and the curing agent in the common supply path are not sufficiently mixed, they are relatively easily separated. Therefore, when the supply of paint is interrupted, the main agent that has stopped flowing and the hardener are separated into upper and lower parts due to the difference in specific gravity in the common supply path, and are divided into a large block of the main agent and a large block of the hardener. There is a concern.
In this case, when the supply of the paint is resumed, only one of the main agent and the curing agent flows into the static mixer in a large amount, and then the other liquid agent flows in a large amount. Therefore, stirring in the static mixer does not proceed sufficiently, and the paint discharged from the static mixer is unevenly distributed in a portion with a large amount of the main agent and a portion with a large amount of the curing agent.
The present invention has been completed based on the above-described circumstances, and an object thereof is to be able to supply a paint having no mixed spots even after the supply of the paint is interrupted.

  As means for achieving the above-mentioned object, the invention of claim 1 includes a main agent supply path dedicated to the main agent, a curing agent supply path dedicated to the curing agent, and a downstream end of the main agent supply path at the upstream end. A common supply path connected to the downstream end of the supply path for the curing agent; a static mixer connected to the downstream end of the shared supply path; and a main agent alternately charged to the upstream end of the shared supply path; A mixed paint supply device configured to supply a mixed paint obtained by mixing a curing agent in a process of passing through the common supply path and the static mixer to a coating gun, the common supply The path is characterized in that a plurality of low passages and a plurality of high passages arranged at higher positions than the plurality of low passages are alternately arranged.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the shared supply path is coiled.

<Invention of Claim 1>
When the supply of the mixed paint is interrupted and the flow of the main agent and the curing agent stops in the common supply path where the main agent and the curing agent are alternately charged, the main agent and the curing agent are separated from each other due to the difference in specific gravity, and the main agent and the curing The liquid agent on the side with a higher specific gravity of the agent sinks into the low channel and the liquid agent on the side with a lower specific gravity floats in the high channel. Here, since the low flow path and the high flow path are alternately arranged in plural, the main agent and the curing agent are formed from the upstream end to the downstream end in the common supply path. And are arranged alternately. Therefore, when the supply of the mixed paint is resumed, there is no risk that only a large amount of the main agent or only a large amount of the curing agent will flow into the static mixer, and the mixing and mixing of the main agent and the curing agent in the static mixer will be good. Done.

<Invention of Claim 2>
Since the shared supply path is in a coil shape, as long as the coil axis of the shared supply path is horizontal or nearly horizontal, no matter how the shared supply path changes, multiple low flow The form where the path and the plurality of high-altitude flow paths are alternately arranged is maintained.

<Embodiment 1>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the mixed paint supply apparatus of the present embodiment is configured to include a main agent supply path 10, a curing agent supply path 11, a common supply path 12, and a static mixer 13. A mixed paint (for example, an aqueous two-component urethane paint) is obtained by mixing the main agent and the curing agent alternately supplied to the upstream end of the passage 12 in the course of passing through the common supply passage 12 and the static mixer 13 in order. The mixed paint is supplied to the coating gun 14. An upstream end of the main agent supply passage 10 is connected to a known main agent pumping device 15 for pumping the main agent, and the main agent supply passage. 10 is provided with a flow meter 16. A hardener pumping device 17 having a known structure for pumping the hardener is connected to the upstream end of the hardener supply passage 11, and a flow meter 18 is provided in the middle of the hardener supply passage 11. .

  A merger 19 is connected to the upstream end of the common supply path 12. The merger 19 includes a main agent inlet (not shown), a curing agent inlet (not shown), and an outlet (not shown). A downstream end of the main agent supply path 10 is connected to the main agent inflow port, and a check valve 20 for restricting the back flow toward the main agent supply path 10 is provided. The hardener inlet is connected to the downstream end of the hardener supply path 11 and is provided with a check valve 21 for restricting the backflow toward the hardener supply path 11. The upstream end of the common supply path 12 is connected to the outlet. A predetermined amount of the main agent and the curing agent are alternately charged into the merger 19 through the main agent supply path 10 and the curing agent supply path 11 so that the charged main agent and the curing agent are fed into the common supply path 12. It has become.

  As shown in FIG. 2, the common supply path 12 includes a pipe 22 having an inner diameter that is constant over its entire length and a circular cross-sectional shape. The pipe 22 is made of a material whose shape does not change easily, such as a metal, and the majority of the area excluding both ends thereof is bent into a coil shape (that is, spirally wound in a circular shape) to form a coil. The flow path 23 is comprised.

  The coil axis of the coiled channel 23 is kept linear, and the coil diameter of the coiled channel 23 is kept constant from the upstream end to the downstream end of the coiled channel 23. Further, in the coiled flow path 23, the helical pitch is set so that the pipes 22 constituting the coiled flow path 23 are separated from each other in the coil axis direction. It is constant from the upstream end to the downstream end. The volume of the coil for one turn of the coil-shaped flow path 23 is determined based on the input amount of the main agent and the curing agent in one cycle (that is, the input amount of the main agent per time for the common supply path 12 and the common supply path 12). It is set to be the same as the volume combined with the input amount of the curing agent.

  One end of the straight short ends of the pipe 22 constituting the common supply path 12 is connected to the upstream end of the coiled flow path 23 as an inflow path 24 substantially parallel to the coil axis. The upstream end of the inflow path 24 is connected to the outlet of the merger 19. The other end of the pipe 22 is connected to the downstream end of the coiled flow path 23 as an outflow path 25 substantially parallel to the coil axis, and the downstream end of the outflow path 25 is connected to the static mixer 13. It is connected to the upstream end.

  The shared supply path 12 is fixedly installed so that the coil axis of the coiled flow path 23 is maintained in a horizontal orientation. In such a state where the coil axis is horizontally oriented, as shown in FIG. 2, the upstream end of the coiled flow path 23 and the inflow path 24 connected thereto are arranged at the highest position, and the coiled flow path The downstream end of 23 and the outflow path 25 connected to the downstream end are arranged at the lowest position.

  The coil-shaped flow path 23 includes a plurality of low flow paths 26 having a circular arc shape below a horizontal virtual boundary surface S parallel to the coil axis, and a circle above the virtual boundary surface. It is comprised by the several high place flow path 27 which makes an arc shape. The plurality of low passages 26 and the plurality of high passages 27 are positioned so as to be alternately arranged in the axial direction of the coil axis, and are constituted by one low passage 26 and one high passage 27. A flow path for one coil is formed. As described above, the volume of the flow path for one turn of the coil is set to be the same as the input amount of the main agent and the curing agent for one cycle, and the volume of one low passage 26 is the input of the main agent for one cycle. The volume of one high passage 27 is the same as the input amount of the curing agent in one cycle.

  The upstream end of the static mixer 13 is connected to the downstream end of the common supply path 12. The static mixer 13 has two types of elements (twisted in a reverse direction) in a spirally twisted form so that a plate piece is inverted 180 ° inside a tubular member (not shown) having a circular cross section. (Not shown) having a known structure in which the elements are arranged along the flow direction (the length direction of the static mixer 13), the elements having opposite twist directions are alternately arranged, and the edges of adjacent elements They are connected so that they are oriented at right angles to each other. The downstream end of the static mixer 13 is connected to the upstream end of the paint supply path 28, and the paint gun 14 is connected to the downstream end of the paint supply path 28.

  Next, the operation of this embodiment will be described. When supplying mixed paint to the coating gun 14, a predetermined amount of the main agent and the curing agent are alternately fed into the junction 19 (upstream end of the common supply passage 12) through the main agent supply path 10 and the hardener supply path 11. To do. The alternately charged main agent and curing agent flow toward the static mixer 13 while being displaced up and down many times along the spiral path (coiled flow path 23) of the common supply path 12.

  In the common supply path 12, the flow rate increases as the distance from the inner wall of the pipe 22 constituting the common supply path 12 increases, so that the interface between the main agent and the curing agent gradually changes into a tapered cap shape (saddle shape), and static As the mixer 13 is approached, the degree of taper increases. Therefore, the number of layers of the main agent layer and the curing agent layer alternately formed concentrically on the virtual cross section in which the inside of the common supply path 12 is cut at right angles to the pipe 22 increases as the static mixer 13 is approached. Go. Then, the closer to the static mixer 13, the higher the distribution ratio of the main agent and the curing agent in the radial direction in the common supply path 12, and the main agent and the curing agent are sufficiently distributed when flowing into the static mixer 13. It becomes.

  As described above, the main agent and the curing agent that have flowed into the static mixer 13 in a sufficiently distributed state so as to be stacked in multiple layers are divided into two spaces having a semicircular cross section in the process of passing through one element. After being twisted in a spiral, it is divided into two semicircular cross-sectional spaces that are 90 ° out of phase when moving to the next element, and twisted in the opposite directions within the two semicircular spaces, It flows while repeating the splitting and twisting operations. As described above, the main agent and the curing agent are stirred while being finely dispersed, and the subdivision and mixing proceed as they move to the downstream side of the static mixer 13. When passing, the variation in the mixing ratio of the main agent and the curing agent becomes small.

  The mixed liquid of the main agent and the curing agent that has been stirred through the static mixer 13 flows in the common supply path 12 in the paint supply path 28 from the static mixer 13 to the coating gun 14. 28 is further distributed in the radial direction due to the difference in flow velocity caused by the distance from the inner wall of 28. As described above, the main agent and the curing agent alternately charged into the common supply path 12 by a predetermined amount are sufficiently distributed during the flow through the common supply path 12 and sufficiently received during the passage through the static mixer 13. By the dispersion action (stirring action) and the sufficient distribution action received while flowing in the paint supply path 28, a good mixed paint mixed at a predetermined ratio when reaching the paint gun 14 is obtained.

  Now, when the supply of the mixed paint to the coating gun 14 is interrupted, the flow of the main agent and the curing agent also stops in the common supply path 12 where the main agent and the curing agent are alternately supplied. Then, in the coiled channel 23, the main agent and the curing agent are separated from each other due to the difference in specific gravity, and the main agent having a specific gravity larger than that of the curing agent sinks in the low-passage channel 26 and has a specific gravity smaller than that of the main agent. The curing agent is in a state of floating in the high place flow path 27.

  Here, since the low channel 26 and the high channel 27 are alternately arranged, a plurality of the low channel 26 and the high channel 27 are arranged in the coiled channel 23 from the upstream end to the downstream end. The main agent and the curing agent are alternately arranged. In addition, the volume of one low channel 26 is the same as the amount of the main agent charged to the common supply channel 12 once, and the volume of one high channel 27 is one for the common supply channel 12. It is the same as the amount of the curing agent input. Therefore, the main agent and the curing agent staying in the coiled flow path 23 are directed from the upstream end to the downstream end of the coiled flow path 23 at the same ratio as the mixing ratio when alternately charged into the common supply path 12. Are alternately arranged.

  Thereafter, when the supply of the mixed paint is resumed, at the beginning of the resumption, the main agent and the curing agent positioned at the downstream end of the common supply path 12 (coiled flow path 23) are supplied to the common supply path 12. It flows into the static mixer 13 alternately by approximately the same amount as the input amount. Thereafter, as the supply proceeds, the main agent and the curing agent that have been distributed flow into the static mixer 13.

  As described above, the shared supply path 12 of the present embodiment has a configuration in which a plurality of low-level flow paths 26 and a plurality of high-level flow paths 27 are alternately arranged. When resuming, there is no possibility that only a large amount of the main agent flows into the static mixer 13 or only a large amount of the curing agent flows into the static mixer 13. As a result, the main agent and the curing agent in the static mixer 13 are well stirred and mixed, and even after the supply of the paint is interrupted, the mixed paint having no mixed spots can be supplied to the coating gun 14.

  In the present embodiment, since the shared supply path 12 is coiled, as long as the coil axis of the shared supply path 12 is horizontal or nearly horizontal, the shared supply path 12 can be changed to any posture. Even in the case of being installed, it is possible to maintain a form in which a plurality of low passages 26 and a plurality of high passages 27 are alternately arranged.

<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) In the above-described embodiment, the volume of the flow path for one coil in the common supply path is defined as the amount of the main agent and the curing agent input in one cycle (one main agent input amount and one hardener input amount). However, according to the present invention, the volume of the flow path for one turn of the coil may be larger than the input amount of one cycle of the main agent and the curing agent.
(2) The volume of the flow path for one turn of the coil in the shared supply path may be smaller than the input amount of one cycle of the main agent and the curing agent. In this case, the volume of the flow path for one turn of the coil may be an amount larger or smaller than a single charge of the main agent, and an amount larger than a single charge of the curing agent. There may be a small amount.
(3) In the above-described embodiment, the common supply path is fixed so as not to expand and contract in the axial direction of the coil axis. However, the shared supply path may be elastically expandable and contractable in the axial direction of the coil axis.
(4) In the above-described embodiment, the common supply path is configured not to be elastically deformed so as to bend the axis of the coil axis. However, the shared supply path can be elastically deformed to be curved such that the axis of the coil axis is curved. It may be a thing.
(5) In the above embodiment, the common supply path is fixed so as to keep the axis of the coil axis horizontal, but the shared supply path may be fixed in a form in which the coil axis is inclined with respect to the horizontal. It is also possible to adopt a form in which the posture can be tilted so that the coil axis is inclined with respect to the horizontal.
(6) In the above-described embodiment, the shared supply path has a shape in which the coil axis forms a straight line, but the shared supply path may have a shape in which the coil axis is curved.
(7) In the above embodiment, the coil diameter is constant from the upstream end to the downstream end of the common supply path, but the coil diameter may be changed in the axial direction of the coil axis. Specifically, the coil diameter gradually decreases from the upstream end toward the downstream end, the coil diameter gradually increases from the upstream end toward the downstream end, and the coil diameter increases at the upstream end and the downstream end. A configuration in which the coil diameter is small at the upstream end and the downstream end, a configuration in which a portion having a large coil diameter and a small portion are alternately continued from the upstream end to the downstream end, and the like are possible.
(8) In the above embodiment, the spiral pitch of the shared supply path is constant from the upstream end to the downstream end, but the spiral pitch of the shared supply path may vary in the axial direction of the coil axis. Specifically, a form in which the helical pitch gradually decreases from the upstream end toward the downstream end, a form in which the helical pitch gradually increases from the upstream end toward the downstream end, and a form in which the helical pitch increases at the upstream end and the downstream end. A configuration in which the spiral pitch is small at the upstream end and the downstream end, a configuration in which a portion with a large spiral pitch and a portion with a small spiral pitch are alternately continued from the upstream end to the downstream end, and the like are possible.
(9) In the above embodiment, the helical pitch is set so that the pipes constituting the shared supply path are separated from each other in the coil axis direction, but the pipes constituting the shared supply path are in contact with each other in the coil axis direction, That is, it may be in the form of a closely wound coil.
(10) In the above embodiment, the pipe constituting the common supply path is spirally wound in a circular shape, but the pipe is spirally wound in a non-circular shape (for example, oval, oval, substantially polygonal, etc.) Form may be sufficient.
(11) In the above embodiment, the cross-sectional shape of the pipe constituting the common supply path is circular, but the cross-sectional shape of the pipe may be non-circular (for example, oval, oval, or substantially square).
(12) In the above embodiment, the shared supply path is coiled, but the shared supply path may have a waveform. The waveform in this case can be a sine waveform, a waveform with a continuous semicircle, a waveform with a continuous square, or the like.

Configuration diagram of Embodiment 1 Partial cutaway enlarged view of the common supply path

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Supply path for main agents 11 ... Supply path for hardening agents 12 ... Common supply path 13 ... Static mixer 14 ... Paint gun 26 ... Low channel 27 ... High channel

Claims (2)

A main agent supply channel dedicated to the main agent,
A curing agent supply path dedicated to the curing agent;
A common supply path in which an upstream end is connected to a downstream end of the main agent supply path and a downstream end of the curing agent supply path;
A static mixer connected to the downstream end of the common supply path,
The mixed paint obtained by mixing the main agent and the curing agent alternately supplied to the upstream end of the common supply path in the process of passing through the common supply path and the static mixer is supplied to the coating gun. A mixed paint supply device comprising:
The common supply path is characterized in that a plurality of low flow paths and a plurality of high flow paths arranged at higher positions than the plurality of low flow paths are alternately arranged. Supply device for mixed paint.   The mixed paint supply device according to claim 1, wherein the common supply path has a coil shape.

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