JPH0150576B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention particularly relates to a clean booth for a plastic injection molding machine installed in a clean room and used for molding ultra-precision products such as compact disks. be.

(Prior art and its problems) Plastic injection molding machines for ultra-precision product molding are installed in class 1000 to 10000 clean rooms, but these clean rooms are expensive equipment, and the injection molding machines themselves use raw materials. Gases generated from the plasticizing device and injection nozzle when plastic is melted, or oil mist from the operating section (toggle mechanism) and lubricating section of the mold clamping device, are sources of contamination in the clean room, resulting in contamination inside the room. In order to maintain cleanliness, the entire clean room must be ventilated many times per unit time, which increases the cost of operating the clean room, and the dust generated from the injection molding machine can damage molds and products. There was a problem that there was a risk of the product becoming attached to the product.

(Object of the Invention) The present invention was devised to solve the above-mentioned conventional problems, and it purifies the air in a clean room and blows it out intensively to the injection molding part, and By collecting the generated gases, injection molding work can be performed in a highly clean air atmosphere, and the grade of the clean room can be lowered to reduce equipment and operating costs. The purpose is to prevent contamination in the clean room due to dust and oil mist generated from injection molding machines.

(Structure of the Invention) The clean booth for a plastic injection molding machine of the present invention is provided with a filter chamber equipped with a blow-off port opening toward the injection molding section in a casing mounted on the plastic injection molding machine, and air is supplied into the filter chamber. A cleaning filter is provided, connected to a blower that supplies air to the filter chamber, and a collection hood that opens toward the nozzle is provided near the injection nozzle, and the collection hood is connected to an exhaust duct. It is characterized by what it did.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a casing, and the casing 1 is provided with a filter chamber 2 that opens downward in the middle part in the longitudinal direction, and a fan chamber 3 that opens on one side is connected to one end part in the longitudinal direction. A grill-type outlet 4 is provided at the lower opening of the filter chamber 2, and an air purifying filter 5 is disposed above the outlet 4. Inside the fan chamber 3, there is a filter chamber 2.
A fixed electric fan 7 is disposed in a partition 6 between the fan chamber 3 and the fan chamber 3 with a discharge port 6' facing the upper part of the inside of the filter chamber 2, and a pre-filter 8 is provided at the side opening of the fan chamber 3. There is. The lower end of the partition wall 6 of the casing 1 is mounted on a fixed platen 11 of a plastic injection molding machine 10 installed in a clean room via a spacer 9, and the end of the casing 1 opposite to the fan 7 is mounted on a fixed platen 11 of a plastic injection molding machine 10 installed in a clean room. It is attached to a bed 13 of a plastic injection molding machine 10 via a support 12. The air outlet 4 opens toward an injection molding section consisting of a fixed side mold and a movable side mold attached to a fixed platen 11 and a movable platen, respectively. The safety door 14 of the plastic injection molding machine 10 has an inverted U-shaped cross section with an upper end partially protruding into the lower surface of the casing 1 and sloped surfaces 15 on both upper sides. A glass window 17 fixed by a glass stopper packing 16 or a product outlet (not shown) is provided. Further, a guide plate 19 facing the slope 15 and side surface of the safety door 14 is provided on the side wall 18 of the casing 1. , a slit 20 for forming an air curtain is formed which is open at the bottom. Furthermore, the upper end of the safety door 14 and the lower end of the partition wall 6 define a slit 21 for forming an air curtain that opens downward. Further, the partition wall 22 facing the partition wall 6 is arranged so that its lower end level is located above the lower end level of the side wall 18 so as to be located near the upper side of the safety door 14.

Reference numeral 23 denotes an exhaust duct built into the casing 1 along its longitudinal direction. At the end of the exhaust duct 23 on the fan 7 side, a collection hood 24 located at the lower part of the fan chamber 3 connects a suction duct (hose) 25. A collection duct 26 is provided at the opposite end of the fan 7, a suction duct (hose) 27 is connected to the lower part of the collection duct 26, and an air volume balance adjustment damper 28 is connected to the connection part. At the same time, an exhaust port 29 is provided on the opposite side of the exhaust duct 23 of the collective duct 26 and is connected to an inlet of an exhaust fan (not shown) via an exhaust duct (hose).
is provided. And the collection hood 24 is
It opens toward the injection nozzle 30 at a position near the injection nozzle 30, such as an upper position or a side position of the injection nozzle. The suction duct (hose) 27 is connected to an air intake port (not shown) bored at a predetermined position in the upper part of the outer panel 31 that covers the operating section of the mold clamping device.

In addition, in this example, the case where the filter chamber is arranged at the upper part of the molding machine is illustrated, but the filter chamber is installed on one side of the molding machine, and the other side and the upper part are used as the product ejection port and mold exchange. It may also be used as a mouth. Alternatively, the collecting duct 26 may not be provided, and the exhaust duct 23 and the suction duct (hose) 27 may each be connected to an exhaust fan (not shown).

Furthermore, if an exhaust fan and a filter are provided outside the clean booth, the exhaust from the molding machines can be treated for each molding machine, or a large number of molding machines can be treated together. In the former treatment method, the exhaust fan and filter may be installed in a clean booth.

FIG. 6 is a front sectional view showing another embodiment of the present invention. In contrast to the first embodiment, in which a blower device (electric fan 7) is connected to the filter chamber 2, in this embodiment, the filter chamber 2 is A duct 32 connects the air blower and the air blower.
The only difference is that the air blower is installed separately.

(Function) Air is passed through the prefilter 8 by the electric fan 7.
The air is introduced into the filter chamber 2 through the filter chamber 2, and then passes through the air purifying filter 5, where it becomes extremely clean and is blown downward from the air outlet 4. The clean air blown out from the air outlet 4 overcomes the rising airflow due to heat from the injection molding part and hits the injection molding part directly, so that the dust generated from the mold part does not adhere to the mold and the product. Expelled outside. Furthermore, some of this clean air is sent to the safety door 14.
Surrounding slits 20, 21 continuous in a U-shape in plan view
The air around the molding machine is blown downward to form an air curtain, and is blown laterally in the opening direction of the safety door 14 through between the partition wall 22 and the safety door 14 to form an air curtain, so that the air around the molding machine can be used for injection molding. This prevents them from entering the room.

On the other hand, due to the suction action of the exhaust fan, generated gas leaking from the tip of the injection nozzle 30 when the plastic is melted is collected by the collection hood 24 and guided into the exhaust duct 23, and is then guided into the collection duct 2.
Move to 6. Further, the air containing lubricant mist that is filled in the outer plate 31 for lubrication of the operating parts of the mold clamping device is led into the collection duct 26, where it is combined with the generated gas to the exhaust port 29. After being cleaned by a filter installed on the exhaust fan side, or directly without going through a collection duct, it is discharged to the outside of the clean room. The suction amount of generated gas and lubricating oil mist is adjusted by an air volume balance adjustment damper 28 so as to be balanced. The damper 28 is an inspection port 33 with an opening/closing cover provided in the casing 1.
It is operated from.

(Effects of the Invention) As described above, the present invention prevents gases generated during plastic melting, lubricating oil mist, etc., from being collected by a collection hood and diffused around the injection molding machine, and the clean room is cleaned by using an air purifying filter. In addition to purifying the air in the clean room and blowing it out intensively to the injection molding section, injection molding work can be performed in a highly clean air atmosphere, and ultra-high precision products can be molded in the clean room. It becomes possible to sufficiently reduce the grade of the clean room, and to significantly reduce equipment costs and operating costs.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a clean booth according to an embodiment of the present invention, FIGS. 2 and 3 are a front sectional view and a partially cutaway plan view of the clean booth, and FIG.
5 is an enlarged view of the main part of FIG. 4, and FIG. 6 is a front sectional view showing another embodiment of the present invention. 1...Casing (partition walls 6, 22, side wall 1
8), 2...Filter room, 3...Fan room, 4
...Air outlet, 5...Air purifying filter, 7...
...Electric fan, 8...Prefilter, 9...Spacer, 10...Plastic injection molding machine (fixed platen 11, bed 13, safety door 14),
12...Support, 20,21...Slit, 2
3... Exhaust duct, 24... Collection hood, 25,
27... Suction duct (hose), 26... Collection duct, 28... Air volume balance adjustment damper, 29...
...Exhaust port, 30...Injection nozzle, 31...Outer plate,
32... Connection duct, 33... Inspection port.

Claims (1)

[Scope of Claims] 1. A filter chamber equipped with an air outlet opening toward the injection molding section is provided in a casing installed in a plastic injection molding machine, an air purifying filter is provided in the filter chamber, and air is supplied to the filter chamber. For a plastic injection molding machine, the apparatus is connected to an air blower for supplying air, and is provided with a collection hood that opens toward the nozzle at a position near the injection nozzle, and the collection hood is connected to an exhaust duct. Clean booth. 2. A clean booth for a plastic injection molding machine as set forth in claim 1, characterized in that a suction duct is connected to the outer plate covering the operating part of the mold clamping device, and the suction duct is connected to an exhaust duct.