JPH024474A - Compressed air type powder spreading device - Google Patents

Abstract

PURPOSE:To uniformly spread powder over a wide area using a simple construction by providing a spray chamber having a powder spreading port, a spray pipe, and a compressed air supply passage, wherein powders blown off into the spray chamber are spread from the powder spreading port using compressed air. CONSTITUTION:When powders that are entrained by air are carried by compressed air through a spray pipe 38, the powder is blown from powder blow-off ports 42 provided thereon into a spray chamber 32. Since other compressed air for spreading powder is supplied to the spray chamber 32, the powder having been blown off are accelerated therein and spread through a powder spreading port 34 uniformly over the surface 30 of printed matters, films, etc., to which spreading is applied. In such device as stated above, the spray pipe 38 can be formed by simply forming holes having a specified shape on its wall at specified intervals and the construction of the spray chamber 32 is very simple, thus resulting in a device of simple construction and easy maintenance.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for dispersing powder using compressed air.
More specifically, it relates to a pneumatic powder dispersion device that blows out a flow of compressed air entrained with powder into a spray chamber, and uses spraying pressure air that is separately sent into the spray chamber to disperse powder from a powder dispersion port. be.

(Prior Art) For example, in offset printing and the like, in order to prevent ink from showing through, a small amount of show-through prevention powder is uniformly sprinkled on the surface of paper immediately after printing.

There are various types of powder dispersion devices, one of which uses compressed air as a driving source. Conventional compressed air type equipment blows compressed air from a blower into a powder pot where powder is stored to create uniform air entrained with the powder, and then transports it with a compressed air flow to create a device as shown in Figure 6. A plurality of spray nozzles 12 attached to the spray pipe 10
There are things that are dispersed from

Details of the dispersion section are shown in Figure 7. The spray nozzle 12 is attached to the spray pipe IO via a mating part 14. The spray nozzle 12 has a large number of small powder dispersion ports 16 formed on its side. A semi-cylindrical temporary partition 18 having a rotation axis that coincides with the central axis of the spray nozzle 12 is incorporated inside the joint part 14, and by changing the direction of the partition with an adjustment screw 20, powder can be removed from each spray nozzle. The amount of body dispersion can be adjusted.

Problems to be Solved by the Invention] In such a conventional pneumatic powder dispersion device, the structure of the portion related to the spray nozzle 12 is quite complicated. If the spraying radius is wide, a large number of spray nozzles 12 must be installed at appropriate intervals, making the overall structure even more complicated. jl
It becomes 91t and becomes expensive. In addition, since there are partition plates inside, powder easily accumulates, requiring delicate adjustments, and the power of the blower that supplies compressed air increases, and there are restrictions on the types of powder that can be used. There was a problem.

The purpose of the present invention is to eliminate the drawbacks of the prior art as described above, and to provide a pneumatic powder dispersion device with a new structure that is extremely simple, easy to operate and maintain, and requires less driving power. It's about doing.

[Means for Solving the Problems j] The present invention, which can achieve the above-mentioned objects, includes a spray chamber having a powder dispersion port, a plurality of powder blow-off ports, and a spray chamber that is inserted into the spray chamber so as to be able to be removed from the outside. It is equipped with a spray pipe to which a flow of compressed air entrained with powder is supplied, and a compressed air supply path that sends compressed air for dispersion into the spray chamber, and the powder blown into the spray chamber is sprayed from the powder dispersion port using compressed air. This is a pneumatic powder dispersion device designed to.

Here, it is preferable that the spray chamber is elongated and elongated to match the width of the surface to be sprayed and the degree of radiation, and that the powder dispersion port is in the form of a slit that faces the surface to be sprayed.

One example is to partition the spray chamber in the center with a filter, insert the spray pipe into one area (where the powder distribution port is formed), and insert the spray pipe into the other area (where the powder distribution port is formed).
There is a structure in which a compressed air supply path for dispersion is attached to the area. As another example, a gutter-like member inserted into a spray chamber is used as a pressure air supply path for spraying, the opening part is arranged to face the spray pipe, and the gutter-like member is entirely covered with a material such as non-woven fabric or filter paper. It may also be configured to be surrounded by a breathable sheet.

Filters and breathable sheets are not essential.

The spray pipe may be a simple pipe without any internal partitions, and the powder outlet may be simply holes formed at appropriate intervals in the pipe wall.

[Operation] When the air entrained with the powder is conveyed to the spray pipe by a pressurized air flow, the powder is ejected into the spray chamber from the powder outlet formed in the pipe. Since another pressurized air for dispersion is sent into this spray chamber, the blown powder is accelerated within the spray chamber and is dispersed from the powder dispersion port, so that it is evenly dispersed on printed matter, film, etc.

The apparatus according to the present invention has a simple structure because the spray pipe only needs to have holes of a predetermined shape formed at predetermined intervals on its wall, and the structure of the spray chamber is also extremely simple. , maintenance, etc. can be easily performed.

Filters and breathable sheets primarily function to uniformly flow compressed air.

[Example 1] Fig. 1 is a schematic configuration diagram showing an embodiment of a pneumatic powder dispersion device according to the present invention, and Fig. 2 is a cross-sectional view taken along the line AA. The device includes a spray chamber 32 located above a surface 30 to be sprayed, such as a printed product or a filter, to which the powder is to be sprayed. The spray chamber 32 has an elongated shape with a length corresponding to the width of the surface to be sprayed 30, and has a slit-shaped powder dispersion port 34 formed opposite to the surface to be sprayed 30, as shown in FIG.

In this embodiment, the spray chamber 32 has a two-part structure, and is divided into two regions by a filter 36 inserted in the center. There is a powder dispersion port 34 on the bottom of the
A spray pipe 38 is inserted and fixed into the open area.

The spray pipe 38 is fixed at its lower part to the bottom wall of the spray chamber 32 by a support member 4°, and has a large number of powder outlet ports 42 extending obliquely upward toward the filter 36.
is open. One end of the spray pipe 38 (the right end in FIG. 1) is closed, and the other end is connected to the powder bot 44. Compressed air is supplied to the powder bot 44 from a first blower 46 via a timing valve (electromagnetic valve) 48 . The other area of the spray chamber 32 partitioned by the filter 36 has a compressed air supply path 5o on its end wall.
is provided, and another compressed air for dispersion is supplied from a second blower 52.

The spray chamber 32 is installed above the sprayed surface 30 as described above. Further, the cloth surface 30 to be covered is transported in one direction. The powder is stored in a powder bot 44. Compressed air is sent from the first blower 46 and is blown onto the powder surface of the powder bot 44. At this time, called "timing", the timing valve 48 is opened and closed in accordance with the transfer speed of the surface 30 to be spread, thereby causing the powder in the powder bot 44 to vibrate and creating uniform powder entrained air. The powder that flew up inside the bot 44 is
Similarly, the powder is sucked and sent to the spray pipe 38 by the compressed air from the first blower 46, and is blown out into the spray chamber 32 from the numerous powder outlet ports 42.

The powder outlet 42 is just an opening. According to the experimental results, if the opening area of the powder outlet 42 is a, the number of particles formed is n, and the cross-sectional area of the spray pipe 3 days is A, then each powder The powder can be blown out almost uniformly from the blowout port 42.

At this time, another pressured air for spraying is sent into the spray chamber 32 from the second blower 52. This compressed air is uniformly blown out through the filter 36, accelerates the powder in the spray chamber 32 as shown by the broken line arrow, and sprays the powder from the powder dispersion port 34 toward the surface 30 to be sprayed.

In this way, in the present invention, the powder is once blown into the spray chamber 32 from the powder outlet 42, and then is stirred and driven by the uniform pressure air passing through the filter 36 and dispersed from the slit-shaped powder dispersion port 34. , the powder is uniformly distributed over the entire length of the powder distribution port 34.

FIG. 3 is a sectional view showing another embodiment of the pneumatic powder dispersion device according to the present invention. In the embodiment shown in FIG. 2, the filter 36 is attached to the center, but this attachment is quite troublesome and the shape of the spray chamber must be designed accordingly. Figure 3 shows an improvement on this point. The structure of the right half inside the spray chamber 32 is similar to the example shown in FIG. 2 above. Therefore, in order to simplify the explanation, corresponding parts are given the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, a member having a semicircular arc cross section, in other words, a gutter-like member 54 is used as a compressed air supply path for sending another compressed air for spraying into the spray chamber 32, and is inserted over almost the entire length of the spray chamber 32. . Its orientation is such that the opening portion faces exactly toward the spray pipe 38. The gutter-like member 54 is wrapped in a breathable sheet 56 such as non-woven fabric or filter paper. The compressed air sent from the second blower 52 is introduced along the gutter-like member 54 located inside the spray chamber 32, passes through the breathable sheet 56, and is evenly directed toward the spray pipe 38. Speech out. This compressed air drives the powder blown out from the powder outlet 42 in the direction shown by the broken line arrow, and the powder is sprayed from the powder spraying outlet 34 toward the surface to be sprayed.

When such a compressed air supply path is adopted, there is no need to fit a filter into the spray chamber 32, which has the advantage of further downsizing and easy maintenance.

4 and 5 show further embodiments of the device according to the invention. Powder outlet 42 is opened by compressed air for dispersion.
The flow of air that sends the powder blown out from the body toward the body dispersion port 34 may be a flow from above as shown in FIGS. 2 and 3, or a flow from above as shown in FIGS. 4 and 5. It may also be a downward flow as shown in the figure. When the flow is set to the lower side, the moving distance of the powder within the spray chamber 32 is increased, and by narrowing the passage, it becomes possible to further accelerate and spray the powder uniformly and powerfully. Also the second
In the embodiments shown in Figs. 4 and 3, there is a risk that powder adheres and accumulates on the right side wall of the inner surface and sometimes falls onto the sprayed surface due to vibrations of the device, etc., but as shown in Figs. You can prevent this by making the air flow from the bottom as shown in the figure.

Note that it is preferable to provide a filter or a breathable sheet because it allows the compressed air for dispersion to flow uniformly and prevents powder from adhering to the compressed air supply path, but it is not necessary to provide it.

[Effects of the Invention] As described above, the present invention blows out the powder into the spray chamber once, drives it by feeding another compressed air, and sprays the powder from the powder dispersion port of the spray chamber toward the surface to be sprayed. Because of this configuration, it is effective in uniformly dispersing powder over a wide width despite having an extremely simple structure. In addition, there is no need for a nozzle with a complicated structure as in the past, the W1 is extremely simple, it is difficult to break down, maintenance is easy, and it can be manufactured at low cost.

Furthermore, since the present invention does not have a complicated nozzle shape unlike the prior art, it is possible to uniformly spray any type of powder that can be conveyed by air through a pipe. In the present invention, there is no need to provide a partition plate or the like inside the spray pipe, so there is less loss of drive of compressed air, and power can be saved.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing one embodiment of a compressed air powder dispersion device according to the present invention, Fig. 2 is an A-AIgr side view thereof, and Fig. 3
5 to 5 are sectional views showing other embodiments of the device according to the present invention. Further, FIG. 6 is an explanatory view showing an example of the prior art, and FIG. 7 is a partially cutaway front view of the main part thereof. 30...Mtit cloth surface, 32...Spray chamber 34...Powder distribution port, 36...Filter, 3
8... Spray pipe, 40... Powder outlet, 5
0... Compressed air supply path, 54... Gutter-like member, 56...
Breathable sheet. Patent applicant: Futatsuka Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A spray chamber having a powder dispersion port, and a spray pipe having a plurality of powder blowing ports and inserted into the spray chamber to which a flow of compressed air entrained with powder is supplied from the outside. and a compressed air supply path for sending compressed air for spraying into the spray chamber, and the powder sprayed into the spray chamber is sprayed from a powder scattering port using the compressed air. 2. The interior of the spray chamber is partitioned approximately at the center by a filter, a spray pipe is inserted into one region where the powder dispersion port is formed, and a compressed air supply path for dispersion is attached to the other region. pneumatic powder dispersion equipment. 3. The compressed air powder dispersion device according to claim 1, wherein the compressed air supply path for dispersion is comprised of a gutter-like member inserted into the spray chamber, and a breathable sheet is attached to surround the gutter-like member.