JP4700799B2 - Draft chamber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a draft chamber for cleaning the surface of various workpieces by wiping with a solvent.
[0002]
[Prior art]
Since a work such as a screen used for printing on a liquid crystal substrate or the like is clogged with ink repeatedly, a solvent is periodically used, and the work surface is wiped with a solvent and washed.
[0003]
The wiping work of the work with the solvent is performed manually in a clean room.
[0004]
[Problems to be solved by the invention]
By the way, there is a problem that the solvent is easily diffused during the wiping operation, and the operator easily smells or inhales the solvent.
[0005]
In particular, in a clean room, conditioned air is circulated, and if the solvent diffuses, there is a problem that this becomes a VOC contamination source.
[0006]
Therefore, an object of the present invention is to provide a draft chamber that solves the above-described problems and can prevent the solvent from diffusing when a workpiece is wiped with a solvent.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that the table surface of the work table is formed of a perforated plate and a suction box is formed below the work table, and a draft portion is provided on the back side of the work table. erected a hood over the workbench sides and front from both sides of the part, a transparent shutter in front of the draft part freely move up and down, on a workbench of the hood side, the front portion of the workpiece to be cleaned with a solvent Provide a front support member to support, and provide a rear support member to support the rear part of the workpiece on the heel side on the work table, and support the front support member to tilt the back side downward and support the workpiece. A draft chamber formed higher than the member .
[0008]
A second aspect of the present invention is the draft chamber according to the first aspect, wherein a suction port comprising a large number of slits is formed in a lower portion on the back side of the draft portion.
[0009]
A third aspect of the present invention is the draft chamber according to the first or second aspect, wherein a lighting device is provided in the draft portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
1 to 4, reference numeral 10 denotes a work table for wiping the work 11 with a solvent (for example, methyl ethyl ketone). The table surface is formed of a perforated plate 12, and the suction box 14 is formed on the lower surface thereof. The legs 14 are provided at the four corners of the box 14.
[0013]
A draft portion 16 is provided upright on the back side of the work table 10.
[0014]
The draft section 16 is formed in a draft chamber 17 formed on the work table 10, a compartment is formed in the upper portion of the draft chamber 17, a machine chamber 20 that houses the suction fan 18 and its drive motor 19, and a draft formed in the rear portion. The suction passage 21 is configured to suck the inside of the chamber 17.
[0015]
The outside of the draft portion 16 is formed by a back panel 22, an upper panel 23, a side panel 24, and a front panel 25, an inner back panel 26 is provided to face the back panel 22, and a suction passage 21 is formed, A partition wall 27 is provided between the inner back panel 26 and the front panel 25 and is divided into a draft chamber 17 and a machine chamber 20.
[0016]
The left-right width of the draft portion 16 is formed to be the same as the left-right width of the work table 10, and the front-rear width W 16 is formed to be approximately half of the front-rear width W 10 of the work table 10.
[0017]
A suction port 29 made up of a number of slits 28 is provided in the lower portion of the inner back panel 26 located in the draft chamber 17, and a slit plate 30 that adjusts the opening degree of each slit 28 located at the suction port 29 is horizontal. It is provided so as to be freely movable (see FIG. 6).
[0018]
The suction passage 21 communicates with the draft chamber 17 through the suction port 29 and communicates with the inside of the suction box 14 through the suction hole 31 below, and the upper portion of the suction passage 21 is connected to the suction fan 18 in the machine chamber 20. Connected to the suction side, the exhaust side of the suction fan 18 is connected to the exhaust duct 32.
[0019]
A transparent shutter 33 made of a glass plate, an acrylic plate or the like is provided on the front panel 25 of the draft portion 16, and a guide groove 34 for guiding the shutter 33 is formed on the side panel 24. The side panel 24 is provided with a stopper 35 that stops the shutter 33 at an appropriate height.
[0020]
A hood 36 is erected from the side panel 24 to the front surface of the work table 10. The hood 36 includes a side hood 37 erected on the side surface of the work table 10 and a front hood 39 erected on the front surface of the work table 10.
[0021]
A lighting fixture 40 such as a fluorescent lamp is provided on the draft chamber 17.
[0022]
The workpiece 11 is provided with front and rear support members 41, 42 on the porous plate 12, and is supported by the support members 41, 42 so that the back side of the workpiece 11 is inclined downward. That is, the front support member 41 is provided on the work table 10 on the hood 36 side, the rear support member 42 is provided on the heel side on the work table 10, and the front support member 41 is higher than the rear support member 42. The rear part of the work 11 is supported by the rear support member 42 and the front part of the work 11 is supported by the front support member 41 so that the back side of the work 11 is supported so as to be inclined downward. A blind plate 43 (FIG. 3) is provided on the porous plate 12 at the position where the workpiece 11 is supported.
[0023]
The front hood 39 is formed so as to be higher than the support height of the front portion of the workpiece 11, and the side hood 37 has a shutter 33 whose front portion is the same height as the front hood 39 and whose rear portion is stopped by a stopper 35. The opening 44 is formed around the lower end of the shutter 33 and the hood 36.
[0024]
Reference numeral 45 denotes a discharge valve connected to the suction box 14. The fan 18 and the luminaire 40 are explosion-proof if the solvent is highly flammable.
[0025]
Next, the operation of the present invention will be described.
[0026]
First, air in the draft chamber 17 is sucked from the suction fan 18 through the suction passage 21 and the suction port 29, and at the same time, air in the suction box 14 is sucked through the suction hole 31, and the perforated plate 12 serving as the table surface. Air on the surface is sucked.
[0027]
In this state, the work 11 to be wiped with the solvent is set on the support members 41 and 42, and the surface of the work 11 is wiped with the solvent.
[0028]
At this time, even if the solvent evaporates, the vapor is heavier than air, and the side surface and the front surface of the work table 10 are surrounded by the hood 36. 14 is sucked into the suction passage 21 through the suction fan 18 and exhausted from the suction fan 18 through the exhaust duct 32. In addition, since the vapor diffusing into the draft chamber 17 during the wiping operation always flows into the draft chamber 17 from the opening 44 surrounded by the lower end of the shutter 34 and the upper edge of the hood 36, It does not diffuse and can reliably prevent the operator from sucking the solvent during the wiping operation.
[0029]
As for this suction air flow, at each position where the opening 44 is divided into 16 equal parts in front, back, left, and right, the minimum wind speed becomes a control wind speed of 0.4 m / sec or more as defined in the enclosure hood of Article 16 of the Organic Solvent Prevention Law Regulations. At the same time, a tracer simulating organic solvent vapor is generated from the location where the organic solvent is generated, and it is confirmed by a tracer air flow visualization test that the tracer does not leak.
[0030]
Further, during the wiping operation, the operator can perform the operation while looking at the workpiece 11 through the transparent shutter 34, so that a safer operation can be performed.
[0031]
Air sucked from the suction passage 21 is sucked into the suction box 14 through the draft chamber 17 and the suction hole 31 through the suction port 29, and the air in the draft chamber 17 flows from the suction port 29 to the suction passage 21. In order to be sucked into the suction passage 21 through the perforated plate 12 and the suction box 14, the pressure in the suction box 14 needs to be maintained at a negative pressure from the draft chamber 17. By adjusting the opening degree of each of the slits 28, it is possible to keep the pressure balance in the draft chamber 17 and the suction box 14 properly, and the wind speed flowing into the opening 44 can be 0.4 m / sec or more. Become.
[0032]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements may be added. For example, a suction system for the suction box 14 and the draft chamber 17 is provided separately. Also good.
[0033]
【The invention's effect】
In short, according to the present invention, the operator can safely perform the wiping work without sucking the solvent during the work of wiping the work with the solvent.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part showing an embodiment of the present invention.
FIG. 2 is a front view showing an embodiment of the present invention.
FIG. 3 is a plan view of FIG. 2;
4 is a right side view of FIG. 2;
FIG. 5 is a cross-sectional view taken along line AA in FIG.
6 is a BB line arrow view of FIG. 1 in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Working table 11 Work 12 Perforated plate 14 Suction box 16 Draft part 33 Shutter 36 Hood 41, 42 Support member

Claims (3)

The table surface of the work table is formed of a perforated plate and a suction box is formed below it. A draft section is provided on the back side of the work table, and a hood is placed from both sides of the draft section to the side and front of the work table. A transparent shutter is provided on the front surface of the draft section so as to be movable up and down, and a front support member is provided on the work table on the hood to support the front part of the work to be cleaned with a solvent. A draft chamber characterized in that a rear support member for supporting the rear portion of the work is provided on the side, and the front support member is formed higher than the rear support member so as to support the work by tilting the work downward .   The draft chamber according to claim 1, wherein a suction port comprising a large number of slits is formed in a lower part on the back side of the draft part.   The draft chamber according to claim 1 or 2, wherein a luminaire is provided in the draft section.

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