KR100759347B1 - Device for discharging gas in cylinder of continuously operating vacuum type injector through upper and lower slide and two space gas discharging - Google Patents

Abstract

A device for discharging gas in a cylinder of a continuously operating vacuum type injector through upper and lower slides and two spaces for discharging gas is provided to remove air and moisture included in raw material fed into the cylinder firstly and to discharge unnecessary gas generated molding a product secondly. A device for discharging gas in a cylinder of a continuously operating vacuum type injector through upper and lower slides and two spaces for discharging gas includes a material supply unit, a screw(180), a movable cylinder(60), a pushing space(110), first and second slide opening and closing units, a dry standby box(), a flange, a high pressure hose, and a check valve. The material supply unit has a nozzle, and a hopper. The screw heats and agitates material. Being installed at the back of screw, the movable cylinder moves back and forth. The pushing space cuts off material and air and prevents material from being jammed when a valve moves. The first and second slide opening and closing units has front and rear rods moved by the cylinder. The dry standby box has an outlet discharging air in materials to feed material between the slide opening and closing units. The flange unit has an inner pipe which is a path for material and an outer pipe which is a discharge outlet. The flange unit is fixed to an inlet of the cylinder. The high pressure hose is connected with the outlet of discharge air in the first slide opening and closing unit and in the dry standby box. The check valve connects the dry standby box with the flange.

Description

Device for discharging gas in cylinder of continuously operating vacuum type injector through upper and lower slide and two space gas discharging}

Figure 1 is a perspective view showing a cylinder gas discharge device of the fully-operated vacuum injection machine through the upper and lower slides and two gas discharge of the preferred embodiment of the present invention.

Figure 2 is a cross-sectional view showing an operating state of the slide opening and closing portion of the present invention.

Figure 3 is an exploded perspective view showing a vacuum drying and gas discharge injection molding apparatus of the present invention.

Figure 4 is a state diagram showing the sealing means portion of the present invention.

Figure 5 is a state diagram showing the sealing means of another embodiment of the present invention.

Figure 6 is a block diagram showing a vacuum drying and gas discharge injection molding apparatus of the present invention.

Explanation of the main symbols in the drawings

10: sealing 20: sealing nut

30: front load 40: rear load

50: on-off valve 60: high pressure cylinder

70: gasket 80: cover

90: bolt 100: inspection window

110: space portion 120: lower support plate

130: upper support plate 140: outlet

150: drying cylinder 160: body

170: hopper support 180: stirring screw

400: Injection molding machine

The present invention relates to a fully-operated vacuum injection machine cylinder gas discharge device through the upper and lower slides and two gas discharge, more specifically, air and moisture buried in the raw material (plastic ash powder, granules, etc.) supplied into the injection molding machine cylinder. To firstly remove and put the raw material into a vacuum-dried state, inject the raw material, completely melt the injected raw material, compress it forward by the screw, and discharge the unnecessary gas generated when producing the molded product to the outside to improve the quality of the molded product. The present invention relates to an injection molding machine gas discharge device.

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 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 a 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.

In addition, there is a problem in that the raw material to be injected is filled with air and contains moisture, so that the defective rate increases when molding the product.

In addition, when the vacuum pressure is increased to maintain the vacuum inside the cylinder, air is sucked into the connection part of the forward / reverse rod of the stirring screw, and a serious problem of dropping the vacuum rate has occurred.

Accordingly, the present invention developed to solve the conventional problems is to construct a two-phase barrier film when discharging the gas generated in the injection molding machine cylinder to the outside sucks out the air inside to maintain a vacuum exhaust gas exhaust system The purpose is to provide.

Another object of the present invention is to provide a vacuum drying and gas ejection injection molding apparatus configured to dry by configuring a separate air space for removing air from the raw material and removing the moisture of the raw material.

Still another object of the present invention is to provide an injection molding vacuum drying and gas discharging device comprising a sealing means to prevent air from penetrating into the connection portion of the support frame and the rod when the stirring screw in the cylinder of the injection molding machine moves forward and backward. There is.

Injection molding vacuum drying and gas discharge device of the present invention for achieving the above object is a nozzle, a raw material supply unit configured with an injection hopper, a screw for heating and stirring the raw material injected into the raw material inlet portion of the injection molding machine cylinder, In the injection molding apparatus installed in the rear of the screw configured to move forward / backward is configured to maintain the exhaust gas discharge generated during melting and the vacuum in the cylinder, the raw material and the cylinder raw material inlet portion of the injection molding machine The first and second slides are formed in the body part to block the air, and the sliding space part of the raw material is formed to prevent the jamming of the raw material when the valve is moved, and the front and rear rods are configured to move the valve reciprocating rod by the cylinder. Opening and closing part: air discharge between the raw materials for the raw material injection between the first and second slide opening and closing portion and The cylindrical ball outlet configured to dry drying air; The lower end of the first slide opening and closing part is formed in a double pipe structure to form a double pipe to the final air discharge and gas discharge, the inner pipe is composed of a flange portion that constitutes the passage of the raw material and the discharge port in the outer portion of the cylinder It is configured to be fixed with a bolt, it is configured to maintain a dry state of the raw material due to the air discharge and air discharge inside the vacuum pump by connecting a high-pressure hose to the outlet to discharge the air inside the drying atmosphere cylinder portion and the first slide opening and closing portion Was achieved.

The first slide opening and closing part of the present invention is the raw material inlet is formed in the upper and lower parts of the body portion, the inside of the body portion of the cylinder raw material inlet of the injection molding machine to move the valve and the raw material space is formed to block the air and the valve is formed It is configured to prevent the raw material from being caught in the lower raw material inlet during the movement, and to configure the inspection window for the removable side on the side of the body portion for the internal inspection, connected to the front and rear rods so that the valve is moved by the cylinder, The connection part of the rod was configured by sealing and fixing nuts for sealing, and the rod was configured to move to the air cylinder.

The stirring means of the present invention was achieved by further configuring the sealing means so that air does not penetrate between the rod moving in the front / rear direction and the support frame for supporting the stirring screw.

It will be described in detail below with reference to the accompanying drawings of a cylinder gas discharge device of the fully-operated vacuum injection machine through the upper and lower slides and the two gas discharge of the preferred embodiment of the present invention.

Vacuum drying and gas ejection injection molding apparatus of the present invention to remove the air from the raw material to be injected to suppress the generation of air in the cylinder, while removing the moisture permeated to the raw material while maintaining the undried raw material in a vacuum state It consists of drying air to dry the material at the same time as drying and drying of the raw material at the same time, and it is composed of two stages, and it is composed of a valve to cut off between the inlet of the cylinder and the raw material inlet. We make with the point. In addition, the sealing means 240 is configured in the connection portion of the rod 190 and the support frame 300 of the stirring screw 180, which is the main cause of seeping from the outside during the vacuum inside the cylinder.

As shown in FIGS. 1 to 6, the vacuum drying and gas discharge injection molding apparatus includes first and second slide openings and closing portions 160.160-1 at the inlet of the cylinder and the outlet of the hopper 170.

As shown in FIG. 1, the first and second slide openings 160 and 160-1 form raw material inlets at upper and lower parts of the body part, and the upper part constitutes a wide space 110 to prevent the raw material from being pushed into the gap. It was comprised so that a raw material may be pushed at the time of opening / closing of the on-off valve 50.

The through-hole is formed in the lower part to form a valve seat to be in close contact with the on-off valve, and the seat is configured to use a weaker material than the valve to increase the sealing rate and lower the friction rate.

In addition, the inside of the body part is formed in the cylinder raw material inlet of the injection molding machine to block the raw material and the air to move the valve space and the space of the raw material is formed to prevent the raw material is caught in the lower raw material inlet when the valve is moved. .

The cover 80 and the gasket 70 are configured to be inspected for the internal inspection by forming a detachable inspection window on the side of the body, and is configured to be opened and cleaned and repaired when the material is replaced and inspected.

The on / off valve is connected to the front / rear rods 30 and 40 so as to be moved by the pneumatic cylinder 60. The connecting portion of the rod constitutes a seal 10 and a fixing nut 20 for sealing. The pneumatic cylinder is configured to move the on-off valve 50.

2 shows an operating state of the first and second slide openings and closings, and shows an open state and a closed state of the on / off valve.

In the vacuum drying and gas discharge injection molding apparatus of the present invention, first and second slide opening and closing portions are formed at the raw material inlet portion of the cylinder and the outlet portion of the hopper, and a double pipe is provided at the cylinder raw material inlet portion of the injection molding machine shown in FIG. The configured flange portion 340 is fixed with a bolt 90.

The flange portion 340 is formed in a double pipe structure to the final air discharge and gas discharge, the inner pipe 330 constitutes a passage of the raw material, the exterior 330-1 is configured with an outlet 140, the inner pipe and Outlets are formed between the exteriors, and spaces are formed so that raw materials are not sucked out. The upper plate support 310 and the lower plate support 320 are configured on the upper and lower portions of the double pipe.

The first slide opening and closing part 160 is formed at the upper end of the flange part, and the first slide opening and closing part is formed with a raw material inlet formed in the upper and lower parts of the body part, and the upper part constitutes a wide space so that the raw material is not pushed into the gap. It is constructed so that raw material can be pushed when opening / closing valve is opened and closed.

The drying air cylinder part 150 is configured on the upper part of the first slide opening and closing part, and the connection part when the bolt is fixed with the lower plate support 130 is configured to increase the sealing rate by configuring the gasket 70.

The second slide opening and closing portion (160-1) is fixed to the upper portion of the drying cylinder by bolting the upper plate support 130 and the connection portion is natural to constitute a gasket.

The drying container is filled with air and the moisture is contained therein, so that the defective rate increases during molding of the product, so that the upper and lower parts are composed of the first and second slide openings and outlets so as to vacuum, and suck the air into the outlet. When the vacuum is maintained, the vacuum is dried to remove moisture from the raw materials.

The second slide opening and closing unit 160-1 is formed on the upper portion of the drying atmospheric cylinder part 150 to block external air between hoppers for supplying raw materials.

The hopper is configured by fixing the hopper support 170-1 to the upper portion of the second slide opening and closing portion with a bolt 90.

It consists of a nozzle in front, a raw material supply unit configured with an injection hopper, a stirring screw for heating and stirring the raw material injected into the raw material inlet of the injection molding machine cylinder, and a moving cylinder installed at the rear of the screw to be forward and backward. In the injection molding apparatus which discharges exhaust gas generated during melting and maintains the vacuum state inside the cylinder, the stirring screw 180 has a gap between the rod 190 moving forward and backward and the support frame 300 supporting the stirring screw. The sealing means 240 is further configured to prevent air from seeping through.

The gap between the rod and the support frame configured to transfer the stirring screw was fixed by attaching a rubber plate to the support frame with a rubber magnet ring plate 210 and a ring plate 230 into which the packing ring 220 was inserted.

Another embodiment of the present invention is a sealing means 240 shown in Figure 5 is a rod sealing 210 inside the rod to move the stirring screw forward and backward and the support frame for supporting the stirring screw to prevent the air from entering (210) -2) is formed and is characterized in that the cap 210-3 of the cup-shaped structure is configured to be fixed to the support frame 300, the fixing bolt 210-1.

The vacuum drying and gas discharge injection molding apparatus of the present invention shown in FIG. 6 discharges air from the vacuum pump P while the first slide opening / closing unit 160 is closed when raw materials are introduced into the cylinder, and at the same time, the second slide opening / closing unit ( 160-1) also keeps the inside vacuum so that the air is vacuumed and dried simultaneously with the vacuum pump in the closed state.

When the stirring screw 180 is retracted and the raw material is injected into the injection molding machine, the second slide opening and closing part is opened to feed the raw material from the hopper 170. In this case, since the atmospheric pressure is applied to the drying atmospheric cylinder 150, the check valves 270 are configured to prevent the flow back to the flange portion 340 lower than the atmospheric pressure.

Check valve 270 is configured in the pipe connected to the drying cylinder 150 and the other was configured to the check valve 270 in the pipe connected to the flange portion 340. The check valve is configured as described above, and the filter 260 is formed at the front of the check valve to prevent foreign substances from being caught in the check valve.

In addition, the outlet of the drying atmosphere is configured to open and close the valve 250 to block the outlet when necessary.

As described above, the first and second slide openings and the opening and closing sides may be controlled by electric control so as to be selectively operated by automatic control, and may be controlled according to the amount of raw material injected by the timer and the size of the injection. Is understood to be included in the rights of the present invention.

As described above, the present invention has been described with reference to the embodiment illustrated in the drawings, but this is only an example, and those skilled in the art may make various forms of deformation and other equivalent embodiments therefrom. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The vacuum drying and gas discharge injection molding apparatus of the present invention has an excellent discharge efficiency for discharging the exhaust gas in the injection molding machine cylinder to the outside, and has an excellent effect of minimizing the defective rate by entering the air discharge vacuum drying state of the raw materials to be injected.

In addition, the first slide opening and closing portion is arranged in two stages to have an excellent effect to increase the sealing rate for forming the inside of the cylinder in a vacuum.

In particular, it is a very useful invention in the injection molding machine industry because it has the effect of minimizing the defect rate by increasing the quality of the injection molded product by blocking the element that inhibits the vacuum by forming a sealing means in the gap with the rod for transferring the stirring screw in the cylinder.

Claims (5)

It consists of a nozzle, a raw material supply unit configured with an injection hopper in front, a screw for heating and stirring the raw material injected into the raw material inlet of the injection molding machine cylinder, and a moving cylinder installed at the rear of the screw so as to be moved forward and backward. In the injection molding apparatus that maintains the exhaust gas discharge and vacuum in the cylinder, a valve movement and a pushing space of the raw material are formed inside the body to block the raw material and air in the cylinder raw material inlet of the injection molding machine. First and second slide opening and closing portion configured to prevent the jamming of the raw material when the valve is moved, and configured the front and rear rod so that the valve reciprocating rod is moved by the cylinder: between the raw material for the raw material injection between the first and second slide opening and closing portion A drying atmosphere configured to have a discharge port configured to discharge the air between the vacuum and the vacuum; The lower end of the first slide opening and closing part is formed in a double pipe structure to form a double pipe to the final air discharge and gas discharge, the inner pipe is composed of a flange portion that constitutes the passage of the raw material and the discharge port in the outer portion of the cylinder It is configured to be fixed with a bolt, it is configured to maintain a dry state of the raw material due to the air discharge and the air discharge inside the vacuum pump by connecting a high-pressure hose to the outlet to discharge the air inside the drying atmosphere cylinder portion and the first slide opening and closing portion And a check valve is formed on a pipe connecting the drying air cylinder part and the flange part. The method of claim 1, wherein the first slide opening and closing portion A raw material inlet is formed at the upper and lower parts of the body, and a valve movement and a pressurized space part are formed in the body to block the raw material and air at the cylinder raw inlet of the injection molding machine. It is configured to prevent pinching, and it is configured to check the inside by forming a detachable inspection window on the side of the body portion, the front and rear rod connection is configured so that the valve is moved by the cylinder, the connection portion of the rod for sealing And a fixed nut, and the rod is a pre-operated vacuum injector cylinder gas discharge device through the upper and lower slides and two gas discharge, characterized in that configured to move to the air cylinder. The method of claim 1, wherein the stirring screw The upper and lower slides and the two-stage gas discharge cylinder injection molding machine cylinder further comprises a sealing means to prevent air from entering between the rod moving in the forward and backward direction and the support frame for supporting the stirring screw Gas exhaust device. The method of claim 3, wherein the sealing means portion The upper and lower slides and two gas discharges are installed by attaching a rubber magnetic ring plate and a ring plate with a packing ring inserted into an inner groove of the injection molding machine to be attached to the rod moving the stirring screw in the cylinder and attached to the support frame. Full-operated vacuum injection cylinder cylinder gas discharge device through. The method of claim 3, wherein the sealing means portion It is characterized in that the cap is formed of a cup-type structure is formed in the interior of the fixing bolt to fix the flame to prevent the air infiltrating between the rod moving in the forward and backward direction and the support frame for supporting the stirring screw Fully-operated vacuum injection cylinder cylinder gas discharge device with up and down slide and 2 gas discharges.

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