JPH0150577B2 - - 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.

(Objective of the Invention) The present invention was devised to solve the above-mentioned problems of the conventional art. 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 has a casing attached to each of a plurality of plastic injection molding machines, and has an air outlet opening toward the injection molding section, and an air outlet located near the injection nozzle. A collection hood that opens toward the nozzle is provided, the collection hood is connected to an exhaust duct, and a blower is connected to the outlet through a connecting duct, and the blower is connected to the suction side or the blowout side of the blower. It is characterized by being equipped with an air purifying filter.

(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 an air chamber 2 that opens downward is provided at one end in the longitudinal direction of the casing 1. A tip duct 3 that expands downward is connected to the lower opening of the air chamber 2.
A grill-type outlet 4 is provided at the bottom of the tip duct 3.

Reference numeral 5 denotes a plurality of plastic injection molding machines installed in a clean room, and the casing 1 is attached to each of the molding machines in the following manner. That is, the lower end of the end wall 6 on the side of the air chamber 2 of the casing 1 is mounted on the fixed platen 8 of the plastic injection molding machine 5 via the spacer 7, and the end wall 9 on the opposite side of the casing 1 is mounted on the fixed platen 8 of the plastic injection molding machine 5 via the support 10. It is mounted on the bed 11 of the plastic injection molding machine 5.

The air outlet 4 opens toward an injection molding section consisting of fixed and movable molds mounted on a fixed platen 8 and a movable platen, respectively. The safety door 12 of the plastic injection molding machine 5 has sloped surfaces 13 on both sides, with the upper end partially protruding into the lower surface of the casing 1.
The safety door 1 has an inverted U-shaped cross section.
A glass window 15 fixed by a glass stopper packing 14 or a product outlet (not shown) is provided on both sides of the container 2. Further, the side wall 16 of the casing 1 is provided with a guide plate 17 facing the inclined surface 13 and the side surface of the safety door 12, and the surface of the guide plate 17 and the safety door 12 are
A slit 18 for forming an air curtain, which is open at the bottom, is formed by the inclined surface 13 and the side surface. In addition, the upper part of one end of the safety door 12 and the end wall 6
A slit 19 for forming an air curtain, which is open downward, is formed by the lower end of the slit 19 . Furthermore,
The partition wall 20 between the end walls 6 and 9 has its lower end level at the side wall 16 so as to be located near the upper side of the safety door 12.
It is arranged above the lower end level of.

Reference numeral 21 denotes an air blower, in which one or more electric fans 23 are installed in a case 22 that opens upward and on one side.
is arranged, the discharge port of the fan 23 is connected to the side opening of the case 22, and an air purifying filter 24 is installed on the case 22 facing the upper opening of the case 22. One end of a connection duct 26 is connected to the discharge port of the electric fan 23 via a branch duct 25 or directly.
The other end of the connection duct 26 is connected to each of the casings 1
is connected to the air chamber 2.

Reference numeral 27 denotes an exhaust duct built into the casing 1 along its longitudinal direction, and the end wall 6 of the exhaust duct 27
A collection hood 28 is connected to the side end, a collection duct 29 is provided at the end of the end wall 9, a suction duct (hose) 30 is connected to the lower part of the collection duct 29, and a suction duct (hose) 30 is connected to the connection part. An air volume balance adjustment damper 31 is provided, and an exhaust port 32 is provided on the opposite side of the exhaust duct 27 of the collective duct 29, which is connected to a suction port of an exhaust fan (not shown) via a discharge duct. The collection hood 28 opens toward the injection nozzle 33 at a position near the injection nozzle 33, such as an upper position or a side position. Suction duct (hose) 30
is connected to an air intake port (not shown) bored at a predetermined position in the upper part of the outer panel 34 that covers the operating section of the mold clamping device. In this embodiment, an air cleaning filter 24 was provided on the suction side of the blower device (electric fan 23), and an air chamber 2 was provided in the air path inside the casing 1 from the connection duct 26 to the air outlet 4. Air purifying filter 2 on the blowing side of the blower
4 may be provided, and even if a guide vane or a deflector is provided in front of the air outlet 4, the same effect can be achieved in that the air can be uniformly blown out from the entire surface of the air outlet 4.

In addition, although we have shown an example in which the air outlet is installed at the top of the molding machine, it is also possible to install the air outlet on one side of the molding machine and use the other side and the top as the product ejection port, mold exchange port, etc. It's okay.

In addition, the collective duct 29 is not provided, and the exhaust duct 2
7 and the suction duct (hose) 30 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.

In addition, the air curtain is formed by using the safety door 12 and the guide plate 17, etc., but the air curtain can be created by changing the air blowing pressure and air blowing amount between the periphery and center of the air outlet 4 at the bottom of the air chamber. may be formed.

(Function) Air is passed through the filter 24 by the electric fan 23.
The air is introduced into the case 22 through the casing 22, and is sent to the air chamber 2 and the tip duct 3 in the casing 1 through the connection duct 26 in extremely clean condition, where it is blown out uniformly downward from the entire surface of 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 12.
Surrounding slits 18, 19 continuous in a U-shape in plan view
The air around the molding machine is blown out downwardly to form an air curtain, and is blown out laterally in the opening direction of the safety door 12 through the space between the partition wall 20 and the safety door 12 to form an air curtain. 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 33 when the plastic is melted is collected by the collection hood 28 and guided into the exhaust duct 27, and is led to the collecting duct 2.
Move to 9. Furthermore, the air containing lubricant mist that is filled in the outer plate 34 for lubrication of the operating parts of the mold clamping device is guided into the collection duct 29 via the suction duct (hose) 30, where the above-mentioned generated Together with the gas, the gas is discharged from the exhaust port 32 or directly without passing through the collecting duct 29, after being cleaned by a filter provided on the exhaust fan side, and then 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 31 so as to be balanced. The damper 31 is operated from an inspection port 35 with an opening/closing cover provided in the casing 1.

(Effects of the Invention) As described above, the present invention prevents the gases generated during plastic melting, lubricant mist, etc., from being diffused around the injection molding machine by collecting them with a collection hood, and maintains the cleanliness inside the clean room. Since the air in the clean room is purified using an air purifying filter and blown 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. In addition, the air in the clean room is further purified by an air purifying filter installed on the suction side of one blower, and then sent to each plastic injection molding machine, making it possible to share the blower and filter. Since it is simple, the entire clean booth can be made simple and inexpensive.

[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. FIG. 1... Casing (end walls 6, 9, side wall 16, partition wall 20), 2... Air chamber, 3... Tip duct, 4... Air outlet, 5... Plastic injection molding machine (fixed platen 8, bed 11) , safety door 1
2), 10... Support, 18, 19... Slit, 21... Air blower (case 22, electric fan 23), 24... Air purifying filter, 25...
... Branch duct, 26 ... Connection duct, 27 ... Exhaust duct, 28 ... Collection hood, 29 ... Collection duct, 30 ... Suction duct (hose), 31 ...
Air volume balance adjustment damper, 32...exhaust port, 3
3...Injection nozzle, 34...Outer plate, 35...Inspection port.

Claims (1)

[Scope of Claims] 1. A casing installed in each of a plurality of plastic injection molding machines has an air outlet opening toward the injection molding section, and a collection hood opening toward the nozzle near the injection nozzle. , the collection hood is connected to an exhaust duct, a blower is connected to the outlet through a connecting duct, and an air purifying filter is provided on the suction side or the blowout side of the blower. Clean booth for plastic injection molding machines. 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.