JPS60245523A - Clean booth for plastic injection molding machine - Google Patents

Abstract

PURPOSE:To contrive to achieve injection molding operation in the atmosphere of high degree-clean air by providing an air cleaning filter at the suction side or the spout side of a ventilator. CONSTITUTION:Air is introduced into a case 22 through a filter 24 by an electric motor 23, and is sent to the air chamber 2 and the tip duct 3 in a casing 1 through a connecting duct 26 at the state of very high clean degree, and then is caused to blow out downward and uniformly from the total area of a spouting outlet 4. The clean air blowing out from this spouting outlet 4 hits directly on an injection molding part, overcoming the upward air current caused by the heat from the injection molding part, whereby the dust generated from a mold is exhausted from the machine, before it adhers to the mold and a product. After the air in a clean room has been further cleaned by the air cleaning filter provided at the suction side of one ventilator, it is sent to each plastic injection molding machine. By this mechanism, the ventilator and the filter are used for common use, and the casing is simplified, so the total clean booth is made simply and at low cost.

Description

[Detailed Description of the Invention] (Field of Industrial Application) 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 discs. be.

(Conventional technology and its problems) Plastic injection molding machines for ultra-precision product molding are class
It is installed in a clean room with a capacity of 1,000 to 1,000 io, ooo, but this clean room is expensive equipment, and the injection molding machine itself generates gas from the plasticizing device and injection nozzle when raw plastic is melted. Alternatively, oil mist from the operating parts (toggle mechanism) and lubricating parts of the mold clamping device is a source of contamination in the clean room, and if the room becomes contaminated, the entire clean room must be cleaned per unit time to maintain cleanliness. The number of times ventilation had to be increased, the cost of operating the clean room was high, and there was a risk that dust generated from the injection molding machine could adhere to the molds and products.

(Object of the Invention) The present invention was devised to solve the above-mentioned conventional problems, and by purifying the air in the clean room and blowing 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 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. It is characterized by

(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 one end of the casing 1 in the longitudinal direction is provided with an air chamber 2 that opens downward. A downwardly expanding tip duct 3 is connected to the lower opening of the air chamber 2, and 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 molding machine by the following method. 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. Safety door 1 of plastic injection molding machine 5
2 has an inverted U-shaped cross section with the upper end partially protruding into the lower surface of the casing 1 and having inclined surfaces 13 on both upper sides;
There are glass stop banks 14 on both sides of the safety door 12.
A glass window 15 fixed by a glass window 15 or a product outlet (not shown) is provided. Also 1, the side wall 16 of the casing 1
is provided with a guide plate 17 that faces the slope 13 and side surface of the safety door 12, and the surface of the guide plate 17 and the slope 13 and side surface of the safety door 12 form an air curtain that is open at the bottom. A slit 18 is configured for the purpose. Furthermore, the upper end of the safety door 12 and the lower end of the end wall 6 define a slit 19 for forming an air curtain that opens downward. Furthermore, the partition wall 2o between the end walls 6 and 9 is arranged so that its lower end level is located above the lower end level of the side wall 16 so as to be located near the safety door 12 in the E direction.

21 is a blower device, which has a case 2 that opens upward and sideways.
One or more electric fans 23 are disposed inside the case 2, and the outlet of the fan 23 is connected to the side opening of the case 22, and an air purifier is placed 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 is provided on the suction side of the blower device (electric fan 7), and an air chamber 2 is provided in the air path inside the casing 1 from the connection duct 26 to the outlet 4. However, the air purifying filter 24 may be provided on the outlet side of the blower, and even if a guide vane or deflector is provided in front of the outlet 4, the air can be blown out uniformly from the entire surface of the outlet 4. It has the same effect.

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 includes a safety door 12 and a guide plate 1.
7 etc., but the air curtain may 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 lower part of the air chamber.

(Function) Air is introduced into the case 22 through the electric fan 23 and the filter 24, and is then sent to the air chamber 2 and the tip duct 3 in the casing 1 through the connection duct 26 after becoming extremely clean. , is uniformly blown downward from the entire surface of the air outlet 4. The clean air blown out from the air outlet 4 overcomes the upward airflow caused by the heat from the injection molding part and hits the small injection molding part directly, so that the dust generated from the mold part does not adhere to the mold and the product. It is ejected from the aircraft. Further, a part of this clean air is blown out downward from the slits 18 and 19 that are continuous in a U-shape in plan view around the safety door 12 to form an air curtain, and also passes between the partition wall 20 and the safety door 12 and is blown out. The air is blown out laterally in the opening direction of the safety door 12, forming an air curtain to prevent air around the molding machine from entering the injection molding section.

(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 In addition to making it possible to mold high-precision products, it is also possible to lower the grade of the clean room.
It becomes possible 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, and simplify the casing. This makes the entire clean booth simple and inexpensive.

[Brief explanation of the drawing]

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. 4 is a A side sectional view taken along the line, FIG. 5 is an enlarged view of the main part of FIG. 4. 1...Casing (end wall 6, 9. side wall 16. partition wall 2
0), 2...Air chamber, 3...Tip duct, 4
...Air outlet, 5...Plastic injection molding machine (fixed platen 8. Bed 11. Safety door 12), 10...
Support, 18.19... Slit, 21... Air blower (case 22. Electric fan 23), 24... Air cleaning filter, 25... Branch duct, 26...
connection duct.

Claims (1)

[Claims] 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.