KR100905076B1 - Gas discharging divice of injection molding machine - Google Patents

Abstract

The present invention can reduce the electrical energy, labor time, labor costs and rejects in the production of molded products by providing the simplest, most efficient and innovative system when discharging the unnecessary gas generated in the injection molding machine cylinder to the outside. In addition, to obtain an injection molding machine gas discharge device to improve the quality of the molded product by vacuum discharge the unnecessary gas generated during the production of the molded product to the injection machine,

Between the supply part for supplying the raw material and the inlet part supplied to the cylinder of the injection molding machine, there is a raw material quantitative supply part and a gas discharge device. The raw material quantitative supply part is composed of a screw and an electronic motor that can adjust the speed. There is a gas discharge part composed of excessive input detection part, gas discharge port and discharge hose, and the generated gas is discharged to the vacuum pressure through the filter and the vacuum pump, and the electronic control part to control the operation timing and speed of the vacuum pump and the electronic motor. Was achieved by constructing.

Gas ejector, Injection machine, Injection molding machine, Screw, Dry heater, Vacuum pump, Raw material supply

Description

Gas discharging divice of injection molding machine

1 is a use situation showing the injection molding machine gas discharge device of a preferred embodiment of the present invention.

Figure 2 is a state in which the rotation of the screw to stop the raw material supply by operating the raw material detection sensor of FIG.

Figure 3 is a use state showing the raw material supply blocking unit in another embodiment of the present invention.

4 is a state in which the raw material supply opening and closing valve of FIG. 3 is closed.

Figure 5 is a state in which a plurality of the blocking portion of another embodiment of the present invention is installed.

Figure 6 is a state diagram showing a dry heater unit of another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: raw material 20: raw material supply unit

30: Raw material quantity supply part

50: electronic motor 60: gas outlet

70 filter 80 vacuum pump

90: electronic control unit 100: raw material detection sensor unit

110: injection machine screw 120: injection machine cylinder

130: sealing means

The present invention relates to an injection molding machine gas discharge apparatus, and more particularly, to provide the simplest, most efficient and innovative system for discharging the unnecessary gas generated in the injection molding machine cylinder to the outside, thereby providing electrical energy, labor time, Labor cost and rejects can be reduced. In addition, the present invention relates to an injection molding machine gas discharging device which improves the quality of a molded product by vacuum discharging unnecessary gas generated during the production of the molded product by an injection machine.

Due to the development of raw material and mold technology, the technology of injection molding is developing day by day, and the products also require various and high precision. In particular, due to the development of raw materials, many special types of alloy molds have been developed, and have a great effect of replacing metals. However, special raw materials constantly emit a large amount of gas, which acts as a problem for mass production of injection molded products.

In the injection molding process, first, a pigment, stabilizer, plasticizer, filler, etc. is added to plastic to make a cylindrical or square chip of several millimeters, that is, compound is placed in a hopper, and there is a cylinder heating chamber right in front of the inlet. Here, styrene resin or polyvinyl chloride, which is a material to be injection molded by heating with heat or high pressure, causes polypropylene to be melted, and then molten resin is injected into the mold through a cylinder and a screw to When the molten resin flows to the corner and solidifies, the mold is separated into two parts, and the mold is repeatedly produced by taking out the solid injection molding from the mold.

Although a molding machine that can mass-produce is used through injection molding, the gas generated from the molten material when molding an injection product is formed with bullet marks, weld lines, bubbles, etc. in the injection molding product. Poor appearance and post-processing, coating, plating, coating, there is also a problem that causes a lot of defective products.

Conventional injection machine has a problem that the inlet of the cylinder is too wide to maintain a vacuum to remove the exhaust gas, and if the inlet is too narrow, the raw material is introduced too late, resulting in poor productivity.

Therefore, the present invention developed to solve the conventional problems is to provide a simple, efficient and innovative system when discharging the gas generated in the injection molding machine cylinder to the outside.

Another object of the present invention is to freely adjust the speed of the raw material supply screw for supplying a certain amount of raw material into the injection machine screw to further increase the efficiency of gas discharge, low cost burden, convenient maintenance, optimal injection molding machine To provide a gas discharge device.

Still another object of the present invention is to provide an injection molding machine gas discharge device configured to supply raw materials uniformly, and to configure a dry heater so as to maintain a feed raw material state optimally.

In order to achieve the above object, an injection hopper is placed on the raw material supply part and the upper surface of the present invention, and the bottom surface is combined with an injection machine, and in the injection molding machine exhaust gas discharge system for discharging gas generated from the inside of the cylinder of the injection molding machine, It consists of a raw material quantity supply part and a gas discharge part between a supply part for supplying the supply part and an inlet part supplied to the cylinder of the injection molding machine, and a gas outlet port and a filter are provided on the side of the electronic motor part and the lower gas discharge part which drives the upper part material supply part. In addition, there is a vacuum pump for discharging the gas discharge at a vacuum pressure, it is characterized by consisting of an electronic control unit for controlling the operation timing of the vacuum pump and the electronic motor.

In the present invention, the injection molding machine gas discharge device comprises a shutoff part and an intermediate gas passage chamber for sealing the external air between the raw material supply part and the raw material supply part, and the blocking part includes an opening and closing valve, a slide valve, and a rod and pneumatic support for the valve. It was achieved by configuring the cylinder to open and close the opening and closing.

The present invention constitutes a two-stage shut-off part and a two-stage intermediate oil passage chamber for sealing external air between the raw material supply portion and the raw material quantity supply portion, and configures a second intermediate diesel oil seal on the upper portion of the raw material quantity supply portion, and opens and closes the opening. And a second shutoff portion composed of a slide valve, a rod supporting the valve, and a pneumatic cylinder, a first stage intermediate oil passage chamber on an upper portion of the second shutoff portion, It was achieved by constructing a pneumatic cylinder and constructing a first cut-off part to block the outside in two steps to increase the sealing rate.

The present invention is achieved by configuring a drying heater unit in the inner surface of the raw material supply unit or the middle case chamber containing the raw material, the dry heater unit is configured to configure the coil heater or the rod heater in the center and to control the temperature by the temperature control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention shown in Figures 1 to 6 is placed on the upper surface of the raw material supply portion 20 is the injection hopper and the bottom surface is coupled with the injection machine cylinder 110 to effectively discharge the vacuum state and exhaust gas to produce the best moldings The gist is that it consists of:

The present invention is composed of a raw material supply unit for supplying the raw material into the cylinder of the injection molding machine, and an inlet portion configured to supply the raw material to the injection cylinder, the transfer screw to the outlet portion of the raw material supply portion to supply the raw material to the upper portion of the inlet constant And a raw material quantitative supply unit configured to supply the raw material supplied into the injection cylinder by forming an electronic motor and a raw material detection sensor unit 100 to block the excessive supply of raw materials by blocking the raw material supply of the raw material quantitative supply unit. And a vacuum discharge chamber formed by forming a gas discharge port in the dust collecting chamber 40 and a dust collecting chamber having a space for discharging the atmospheric space and gas of the transferred raw material and controlling the vacuum pump and the electronic motor 80 connected through the discharge pipe. The electronic control unit 90 is configured to achieve this feature.

Raw material quantitative supply unit 30 of the present invention constitutes the raw material quantitative supply unit 30 to quantitatively supply the raw material into the injection cylinder 120, the blocking of the air flowing from the raw material supply unit 20 for supplying the raw material ( 10) by supplying the injection machine screw 110 smaller than the amount required to lower the raw material density in the screw 110 to smoothly discharge the unnecessary gas generated in the screw (110). Moreover, the electronic motor 50 which controls the quantity of the raw material 10 supplied freely through the rotation of the transfer screw 30-1 is comprised.

The transfer screw (30-1) is equipped with a watermill valve equipped with a plurality of plates mounted on the shaft so that the quantitative supply of the raw material, or the method of supplying the raw material by standing upright screw is included in the present invention. .

In the lower part of the raw material quantitative supply unit 30, the raw material quantitative supply unit is configured to block the raw material supply so that the excessive raw material is configured so that the raw material detection sensor unit 100 is formed, and a space is formed for air space and gas discharge of the transferred raw material. The dust collecting chamber 40 is comprised. In addition, the gas dust collecting chamber was configured to transfer the raw material 10 from the raw material quantitative supply unit 30 into the injection machine screw 110, and to collect and discharge the gas generated in the injection machine cylinder 120.

Inside the dust collecting chamber 40, a raw material detecting sensor unit 100, which is a sensor that detects an excessive supply of the raw material 10 and informs a signal to the electronic control unit 90, is formed, and the side surface is generated in the injection machine cylinder to collect the dust. A gas discharge port 60 for discharging the collected gas is configured.

As shown in FIG. 2, the feed screw 30-1 is stopped so that the raw material is excessively supplied to the inside of the dust collecting chamber 40 to sense the raw material detecting sensor unit to block the raw material supply.

As described above, the raw material detection sensor 100 is detected and provided to the electronic control unit 90 at the position where the supply of the raw material is set, and the electronic control unit cuts off the power of the electronic motor unit 50 to stop the operation.

      Outside the discharge pipe (60-1) to the outlet of the dust collecting chamber is equipped with a filter 70 for reducing the harmfulness of the gas discharged through the gas outlet (60) to filter the dust therein, and then a vacuum pump which is a gas discharge means Configure 80. In addition, the electronic speed control unit 90 is configured to control the rotational speed and operating time of the electronic motor 50, the pressure control of the vacuum pump 80, and the raw material detection sensor unit 100 that detects excessive input of raw materials.

In addition, it is configured as follows to reduce the amount of air introduced from the outside to the maximum by the gap of the rotating shaft of the injection screw of the injection cylinder to increase the vacuum pressure in the injection cylinder. In order to further facilitate the discharge of the gas, the airtight sealing means 130 for entering the cylinder 120 and the screw 110 in contact with the rear side of the injection cylinder 120 was configured.

The sealing means 130 is composed of a rubber magnet ring (130-1) and a rubber magnet ring (130-3) in which the rubber ring (130-2) is built so as not to flow into the gap of the rotating part. .

The dust collecting chamber of the present invention is configured so that the upper part and the lower part can be separated by fixing with bolts for easy dust cleaning or repair in case of failure. In addition, the raw material quantity supply unit 20 and the raw material supply unit 20 is coupled by a bolt, the gas discharge unit 40 and the injection cylinder 120 is also composed of a bolt.

The combination is characterized by excellent compatibility by mounting a plate suitable for the inlet when the inlet of the injection machine cylinder 120 or the raw material supply unit 20 is different depending on the type of injection molding machine.

3 to 5, the injection molding machine gas discharging device of the present invention of another embodiment shown in Figures 3 to 5 for the sealing of the external air between the raw material supply unit 20 and the raw material quantitative supply unit 30 and the intermediate gas passage room (20-1) was configured.

The blocking unit was configured to open and close the opening and closing port 140, the sliding valve 150, the rod supporting the valve 160 and the pneumatic cylinder (170).

It is configured as described above to operate the valve so that the valve is sealed with the outside by shielding the valve. At this time, the supply of the raw material is made to the maximum or the transfer screw (30-1) to stop the external air inflow by blocking the opening and closing port by moving the valve in the drawing shown in FIG.

Another embodiment of the present invention shown in Figure 5 is composed of a multi-stage to have a high sealing force is a two-stage blocking unit (180, 180-1) for sealing the outside air between the raw material supply unit 20 and the raw material quantitative supply unit 50 And two-stage intermediate transit chambers 20-1 and 20-2.

A second intermediate gas oil passage 20-2 is formed at an upper portion of the raw material quantity supply unit, and an opening 140-1, a slide valve 150-1, and a rod 160-1 supporting the valve are disposed at an upper portion thereof. And a second blocking portion 180-1 including the pneumatic cylinder 170-1.

The first stage intermediate gas passage 180 is formed on the second blocking portion 180-1, and the opening and closing port 140, the sliding valve 150, the rod 160 supporting the valve, and the pneumatic cylinder are provided. It is configured to block the outside in two steps by configuring the first blocking portion to increase the sealing rate.

The configuration as described above was controlled by the electronic controller to close the second blocking unit 180-1 when the first blocking unit 180 is opened to minimize the inflow of external air.

 The injection molding machine gas discharge device according to another embodiment of the present invention shown in FIG. 6 is configured as follows so as to dry the supplied raw material by forming a dry heater part on the inner surface of the raw material supply part or the intermediate gas passage chamber.

Drying heater 220 has a protective case, the coil heater 190 or the rod heater in the center in the protective case and the temperature control unit 210 to control the temperature.

A vacuum drying is performed on the inner surface of the raw material quantitative supply unit 30 or the intermediate diesel room.

In the embodiment of the present invention, the vacuum pressure is expressed as 0 ~ -760mmHg, 0 ~ -100kpa, etc. As water rises quickly in high mountains, water boils at room temperature 5 degrees due to vaporization of gas in -500mmHg vacuum state. . Preliminary drying is usually carried out for about 1 to 4 hours for molding at the injection machine site. If a vacuum dryer is used, even if it is only dried for 20 to 30 minutes, there is an effect of 1 to 4 hours of a general dryer. In addition, the main reason for drying is to reduce the generation of gas in the molded product, so as to combine the vacuum dryer and the gas discharge device as in this example to ensure the perfect quality and to reduce the pre-drying time to reduce energy, time, labor costs in the production site This is widely possible.

     The upper part of the present invention has a raw material inlet and the lower part of the supply and block, the blocking unit 170 for creating a vacuum in the lower part to block the inflow of air is placed under the drying heater for drying the raw material It was. The heater 190 is installed to increase the drying temperature, and the outside of the heater is configured as a protective cover 200 to prevent the raw material from directly contacting the heater and melting. The lower end of the protective cover 2001 has holes formed in several places such that the raw material is lowered. In addition, there is a temperature control unit 210 for controlling the temperature of the heater 190 and a gas discharge pipe 60-1 for discharging the generated gas and air. The gas discharge port 60-1 is coupled to the lower gas discharge pipe 60 and connected to the filter 70.

In another embodiment of the present invention, but using the vacuum drying chamber on the top of the present invention as an example, it is also possible to use a hot air, nitrogen, air-type dryer instead of the vacuum drying chamber (where the built-in heater heater). In addition, the installation form of the heater of the vacuum drying chamber is also applicable to changing the interior or exterior of the dryer freely. In the present invention, the sealing means for preventing the inflow of the back of the cylinder is composed of a combination of a rubber magnet and iron, but various other forms. It can be seen that the configuration belongs to the rights of the present invention.

Since the injection molding machine gas discharge device of the present invention is expensive to install the gas discharge unit, such as a vacuum pump, the exhaust gas is discharged by forming a fan or a blower in the discharge port 60 on the side of the dust chamber. As can be seen that the invention configured to obtain the maximum effect is also included in the present invention.

As described above, the present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely exemplary, and it should be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be. Since the structure is simple, the installation cost is low and the discharge rate is excellent because the gas is discharged in a vacuum state using a vacuum pump, and the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

The injection molding machine cylinder gas discharge device of the present invention has an excellent discharge efficiency for discharging the exhaust gas in the injection molding machine cylinder to the outside.

By controlling the supply of raw materials to be quantitatively supplied, there is an excellent effect of solving the problem of blocking raw materials flowing into the cylinder and low productivity due to low supply.

In addition, it has the effect of maintaining the moisture content of the raw material to be supplied in an optimal state and controlling the drying condition. Also, the structure is simple, so the facility is minimized, the burden on the user is reduced, the quality of the injection molded product is minimized, and the defect rate is minimized. This is a very useful invention in the injection molding machine industry.

Claims (5)

delete delete In the discharge device for discharging the air and the generated gas in the injection cylinder formed between the raw material supply unit and the injection machine, The raw material supply unit for supplying the raw material, and the inlet portion is configured to supply the raw material to the injection molding machine cylinder, and the feed screw and the electronic motor to configure a constant supply of the raw material on the upper portion of the inlet to the constant supply of the raw material supplied into the injection cylinder Raw material quantitative supply unit configured to supply; A dust collecting chamber constituting a raw material detecting sensor so that excessive raw material is not inputted into the raw material quantity supplying unit, and a space for discharging gas in the air space and the injection cylinder of the transferred raw material; By forming a gas discharge port on the side of the dust collecting chamber to control the vacuum pump and the electronic motor connected through the discharge pipe to configure the electronic control unit to achieve a vacuum discharge, A second stage intervening chamber and a second stage intermediate oil passage chamber are formed between the raw material supply portion and the raw material quantity supply portion to seal the external air, and a second intermediate diesel oil chamber is formed on the upper portion of the raw material quantity supply portion. A second shut-off portion comprising a slide valve, a rod supporting the valve, and a pneumatic cylinder; The first stage intermediate oil passage chamber is formed on the second blocking portion, the opening and closing valve, the rod and the pneumatic cylinder supporting the valve, and the first blocking portion are constituted to block the outside in two steps. Injection molding machine gas discharge device characterized in that to increase.       The method of claim 3, wherein the raw material supply unit or intermediate case yarn The raw material supply unit or intermediate case containing the raw material comprises a dry heater unit on the inner surface of the chamber, The drying heater unit comprises a coil heater or a rod heater in the central portion and the injection molding machine gas discharge device, characterized in that configured to control the temperature by the temperature control unit. delete

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