JPH0150579B2 - - 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 problems of the conventional art, and it purifies the air in the clean room and blows it out intensively to the injection molding section. The purpose is to enable injection molding work to be performed in a highly clean air atmosphere, and to lower the grade of the clean room to reduce equipment and operating costs.

(Structure of the Invention) The clean booth for a plastic injection molding machine of the present invention includes a plastic injection molding machine provided with an air outlet opening toward the injection molding section, a blower device connected to the air outlet via a connecting duct, It is characterized in that an air cleaning filter is provided on the suction side or the blowout side of the blower.

(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.
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 connecting duct 26 is connected to the outlet of the electric fan 23 via a branch duct 25 or directly. The other end of the connection duct 26 is connected to the air chamber 2 of each casing 1.

In this embodiment, an air cleaning filter 24 was provided on the suction side of the blower device (electric fan 7), and an air chamber 2 was provided in the air path inside the casing 1 from the connection duct 26 to the outlet 4.
An air purifying filter 24 may be provided on the outlet side of the blower, and a guide vane or deflector may be provided in front of the outlet 4, but the same effect can be obtained in that the air can be blown out uniformly from the entire surface of the outlet 4. It is.

In addition, although we have shown an example in which the blow-off port is installed at the top of the molding machine, it is also possible to install the blow-off port 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.

Furthermore, the air curtain is formed using the safety door 12 and the guide plate 17, etc., but the air curtain can be formed by changing the air blowing pressure and air blowing amount between the periphery and the 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. .

(Effects of the Invention) As described above, since the present invention blows clean air intensively into the injection molding section, injection molding work can be performed in a highly clean air atmosphere similar to that in a clean room, and it is possible to It becomes possible to fully mold high-precision products, lower the grade of the clean room, and 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, and to use the casing as well. 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.

Claims (1)

[Claims] 1 A plastic injection molding machine is provided with an air outlet that opens toward the injection molding section, an air blower is connected to the air outlet via a connecting duct, and an air purifying filter is provided on the suction side or the outlet side of the air blower. A clean booth for plastic injection molding machines.