KR20060103405A - Gas exhausting device of cylinder for injection molding - Google Patents

Abstract

The present invention relates to a cylinder gas discharge device, comprising: a cylinder gas discharge device for injection molding for discharging gas generated in a cylinder of an injection machine; A main body installed between the material injection hopper and the cylinder of the injection machine, the main body having a gas discharge structure to guide and discharge the gas in the cylinder by air pressure; A filter unit coupled to the main body unit to induce the inflow of the exhaust gas by air pressure and to filter the exhaust gas from the cylinder for the second time and to exhibit a noise removing effect; Disclosed is a technical configuration including a control unit which provides air pressure for inducing gas discharge into a cylinder, respectively, and controls the air supply only when a metering signal of the injection machine is provided.

According to the present invention, by inducing the gas discharge in the cylinder by the air pressure can increase the efficiency for the gas discharge in the cylinder of the injection molding machine can eliminate the failure of the device and can provide the usefulness to improve the operating efficiency of the device In addition, it eliminates gas in the cylinder and eliminates contamination due to material replacement, which greatly reduces product defects, enables the molding of products without impurities, and facilitates the molding of precision parts, thin films, and lenses that were previously impossible. This allows for a wider range of applications for product molding.

Description

GAS EXHAUSTING DEVICE OF CYLINDER FOR INJECTION MOLDING}

1 is a view showing a state of use of the cylinder gas discharge device according to the present invention.

Figure 2 is a schematic diagram showing the overall configuration of a cylinder gas discharge device according to the present invention.

Figure 3 is a schematic front view showing a cylinder gas discharge device according to the present invention.

Figure 4 is a view showing the configuration of the material input pipe and the outdoor air inlet pipe according to the present invention.

5 is a cross-sectional view showing a second filter unit according to the present invention.

Figure 6 is a cross-sectional detail view showing an air blower according to the present invention.

Figure 7 is a cross-sectional detail view showing a secondary filter according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Material input hopper 2: Cylinder

110: main body 111: block body

111b: gas outlet 111c: air injection hole

111d: outside air inlet hole 112: material input pipe

113,122a: Air blower 113b, 22: Air injection groove

113c, 23: air through 114: air inlet pipe

115: filter internal socket 120: filter

121: first filter unit 121b: primary filter

121d: Air injection hole 122: Second filter part

122b: sound insulation material 122c: secondary filter

31: filter socket 31a: through hole

32: carbon filter member 130: control unit

131: enclosure 133: branch pipe

134: solenoid valve 135: relay

The present invention relates to an apparatus for discharging a gas generated therein from a cylinder which is an extrusion body of a raw material in an injection molding machine, and more specifically, it is possible to discharge the gas generated in the cylinder of the injection machine using air pressure. The present invention relates to a cylinder gas discharge device capable of interlocking a gas discharge operation in a cylinder by interlocking only with a metering signal of an injection machine, and improving the operation efficiency of the present apparatus as well as the gas discharge efficiency in an injection cylinder.

In general, injection molding is a molding method in which a synthetic resin molding material is injected into a cylinder of an injection machine, heated to melt, and then pressed into a molding mold to mold a plastic product.

However, in this injection molding operation, there is a problem that gas is generated from the molten synthetic resin raw material during the process of inserting the molding material into the cylinder, melt-molding the resin, and injecting the injection molding material. There was a problem of filling the inside of the molding die when indenting.

In other words, the gas generated in the cylinder is filled in the molding die, which causes problems such as appearance defects in the plastic molded product due to the gas.

Accordingly, during injection molding, the gas generated in the cylinder must be discharged to the outside so that gas is not filled into the molding die, and for this purpose, an injection molding gas discharge device and a structure are applied.

By the way, according to the conventional injection molding gas discharge device and structure, there is still a problem that the efficiency of the gas discharge is inferior, such that the gas is not discharged sufficiently or the smooth discharge is not formed due to the back flow, etc. It makes it difficult to produce products and secure reliability.

In addition, conventionally, due to the deterioration of the gas discharge efficiency, there is a considerable difficulty in forming precision parts, thin films, or lenses having difficult molding conditions.

The present invention has been made in view of the above-described problems, the purpose of which is to discharge the gas by using the air pressure and to perform the gas discharge operation in the cylinder in conjunction with only the metering signal of the injection machine The present invention provides a cylinder gas discharge device that can improve not only the gas discharge efficiency of the cylinder but also the operation efficiency of the device.

In addition, the present invention can significantly reduce product defects due to gas, enable the molding of products without impurities, and facilitate the molding of precision parts, thin films, and lenses that were previously impossible. It is to provide a cylinder gas exhaust device to expand the range.

Furthermore, the present invention provides a cylinder gas discharge device that not only improves the environment of injection molding but also reduces maintenance of the mold by reducing gas contamination of the molding die.

The present invention for achieving the above object is in the injection molding cylinder gas discharge device for discharging the gas generated in the cylinder of the injection machine; A main body installed between the material injection hopper and the cylinder of the injection machine, the main body having a gas discharge structure to guide and discharge the gas in the cylinder by air pressure; A filter unit coupled to the main body unit to induce the inflow of the exhaust gas by air pressure and to filter the exhaust gas from the cylinder for the second time and to exhibit a noise removing effect; Technical features of the technical configuration of the main body portion and the filter portion including a control unit for providing air pressure to induce the discharge of gas in the cylinder, respectively, so as to supply air only when the metering signal of the injection machine.

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

1 is a view showing a state of use of the cylinder gas discharge device according to the present invention, Figure 2 is a schematic view showing the overall configuration of the cylinder gas discharge device according to the present invention, Figure 3 is a cylinder gas discharge device according to the present invention Figure 4 is a schematic front view showing, Figure 4 is a view showing the configuration of the material input pipe and the air inlet pipe according to the present invention, Figure 5 is a cross-sectional view showing a second filter unit according to the present invention, Figure 6 is the air according to the present invention It is a cross-sectional detail view which shows the blower, and FIG. 7 is a cross-sectional detail view which shows the secondary filter by this invention.

As shown in Figures 1 to 7, the injection molding cylinder gas discharge device according to the present invention is installed between the material injection hopper (1) and the cylinder (2) of the injection machine to discharge the gas in the cylinder (2) by air pressure A main body 110 having a gas discharge structure, and coupled to the main body 110 to induce the inflow of the exhaust gas by air pressure, and to filter the exhaust gas from the cylinder 2 on a secondary basis; In addition, the filter unit 120 and the main body unit 110 and the filter unit 120 that provide the noise removing effect are provided with air pressure for inducing gas discharge in the cylinder 2, respectively, It includes a control unit 130 that is controlled to supply.

The main body 110 has a material inlet 111a and a gas outlet 111b at upper and lower centers, respectively, and an air injection hole 111c and an outside air inlet hole 111d formed at the side thereof, and have an internal hollow E1. It is provided with a block body 111 and a material inlet pipe 112 having a predetermined length in communication with the material inlet 111a of the block body 111, and protruding to the side of the block body 111; And the air blower 113 connected to the hollow E1 and the air injection hole 111c and vertically installed at the outside of the material injection pipe 112 and connected to the outside air inlet hole 111d and a plurality of perforations ( The air inlet pipe 114 having the bottom surface formed with 114a) and the filter inlet socket 115 fastened to the air inlet hole 111d to remove dust and foreign matter from the external inlet air.

At this time, the bottom surface 111e of the hollow body E1 of the block body 111 is inclined downward so that the input material and dust do not stay in the block body 111 before the replacement of the input material. It is desirable to prevent the inflow of contaminants and defects in the product by preventing the inflow of used materials. Here, the block body 111 may be manufactured in various forms such as circular, square or hexagonal.

The material input pipe 112 is preferably installed to maintain the interval between the end and the upper surface of the screw 3 in the cylinder (2) to 10 ~ 15mm to increase the gas discharge efficiency. In this case, when the length of the material input pipe is too long and the gap is 10 mm or less, friction between the material and the material input pipe may occur, which may cause a danger due to the friction. If it is 15mm or more, the gas discharge space disappears according to the material input.

The air blower 113 is a body 113a having an inner hollow E2 in a pipe shape, and an air injection groove 113b connected to the air injection hole 111c around an edge of a rear end of the body 113a. To form a configuration having a plurality of air through holes (113c) for inducing the flow of air from the air injection groove (113b) to the front of the inner hollow (E2).

Here, the hollow (E2) of the air blower 113 is installed in communication with the hollow (E1) of the block body 111.

The outside air inlet pipe 114 has a bottom surface and forms a plurality of perforations 114a to facilitate the inflow of only the outside air into the cylinder 2 and to prevent the jamming of the input material, thereby making it easy to discharge the cylinder side gas. To help.

The filter unit 120 forms an inlet path 121a to allow the gas sucked and discharged by the air pressure from the main body unit 110 and installs a primary filter 121b on the inlet path 121a. The first filter part 121 having the movement path 121c and the air injection hole 121d of the differentially filtered gas, and the movement path 121c and the air injection hole 121d of the first filter part 121. Built-in air blower (122a) connected to the sound insulation material (122b) is attached to the opposite side of the air blower (122a) and the first filtering gas flowing through the air blower (122a) to the second and at the same time noise To the second filter portion 122 provided with a plurality of secondary filters 122c to suck / remove it.

Here, the air blower 122a of the second filter part 122 has the same configuration as that of the air blower 113 of the main body part 110 described above. In this case, reference numerals in parentheses in FIG. The moving path 121c of the first filter part 121 communicates with the hollow E3 of the blower 122a, and the air injection groove 22 of the air blower 122a of the first filter part 121 The air injection hole 121d is connected.

The primary filter 121b is provided with a cover C as an exterior form exposed to the outside, and is composed of a gas identification filter member which is discolored upon contact with the gas. It is easy to see with the naked eye.

The secondary filter 122c is installed inside the second filter part 122 and has an internal hollow filter socket 31 having a plurality of through holes 31a along the side circumference thereof, and the filter socket 31 of the secondary filter 122c. It is made of a carbon filter member 32 mounted on the inner wall.

The sound insulation material 122b is composed of a sponge or foam urethane of the egg-shaped structure, it will be apparent that it can be applied to select from other sound insulation / sound insulation / sound absorbing material that can absorb sound.

In addition, the air injection hole 111c of the main body unit 110 is connected to the air volume control valve (not shown), thereby adjusting the amount of air injected into the air injection hole 111c of the main body unit 110. By doing so, the air and gas flowing into the filter unit 120 from the main body unit 110 may be well discharged without being reversed. That is, the air pressure injected into the air injection hole 111c of the main body 110 is made smaller than the air pressure injected through the air injection hole 121d of the filter unit 120 to induce the discharge gas in the cylinder and its discharge. The flow of air to be made smoothly from the body portion 110 to the filter portion 120.

The control unit 130 is provided with a main supply pipe 132 and the branch pipe 133 branched to the housing 131, one of the branch pipe 133 is in the air injection hole (111c) of the body portion 110 The other one of the branch pipe 133 is connected to the air injection hole 121d of the filter unit 120, and the solenoid valve 134 for opening and closing is installed for each branch pipe 133, but the relay 135 is connected thereto. It is connected and installed so that the air can be supplied only at the metering signal of the injection molding machine. At this time, the relay 135 to open and close the solenoid valve 134 is connected to receive a control signal from the main control unit (not shown) of the injection molding machine.

Further, a sensor 141 is fixed to the block body 111 of the main body 110 so as to adjust the amount of the input material is provided for detecting the input amount of the input material, the detection signal of the sensor is the control The butterfly 130 is designed to be transmitted to the unit 130 and receives a control command from the control unit 130 so that the wing 142a rotates to adjust the input amount of the input material. At this time, the butterfly 142 is mounted on the material injection hopper (1).

Referring to the operation of the cylinder gas discharge device according to the present invention having such a configuration as follows.

First, the injection molding machine is operated and the material for molding is introduced through the material injection hopper 1. At this time, the detection sensor 141 fixed to the block body 111 of the main body 110 detects the input amount of the input material and sends a detection signal to the control unit 130, the control unit 130 is a butterfly 142 Sending a control signal to the to adjust the amount of input material while adjusting the rotation angle of the blade (142a). In addition, air is injected into the main body 110 and the filter 120 by opening a solenoid valve 134 by sending a signal to the relay 135 of the control unit 130 from the main control unit.

The injected material is introduced into the cylinder 2 in which the screw 3 is disposed through the material introduction tube 112 of the main body 110, melted in the cylinder 2 and extruded by the rotational force of the screw 3. It is pressed into a molding mold (not shown) for product molding. At this time, while the input material is melted in the cylinder (2), the gas is generated, the gas generated in the cylinder (2) by the gas discharge device of the present invention by suction and forced discharge through the air pressure It can be removed immediately and prevents gas filling into the mold.

Here, the gas discharge principle and operation of the gas discharge device according to the present invention in detail, the main body 110 and the filter unit 120 from the control unit 130 through the control signal of the main control unit (not shown) Air is injected into the air injection holes 111c and 121d, respectively. At this time, the control unit 130 is opened so that only the metering signal of the injection machine is opened so that air can be injected, and the air injected into the main body unit 110 is less in air pressure than the air injected into the filter unit 120. Adjust to prevent backflow of injected air and exhaust gas.

Air injected into the air injection hole 111c of the main body 110 flows into the air injection groove 113b of the air blower 113 and is sprayed to the front of the inner hollow E2 through the plurality of air through holes 113c. While inducing the flow of air to the inlet path (121a) of the filter unit 120. The gas generated in the cylinder 2 is forcibly raised by the flow direction and the air pressure thus formed, and the filter unit is provided through the air blower 113 communicated via the gas outlet 111b of the main body 110 and the internal hollow E1. Forced discharge into the inflow path (121a) of (120).

At this time, the outside air flows into the cylinder 2 through the outside air inlet pipe 114 of the main body 110, the inlet of the outside air in the cylinder (2) allows easy and smooth discharge of the gas generated in the cylinder. Let's do it. In addition, when the outside air is introduced into the cylinder 2 for the above effect, only the outside air purified into the cylinder 2 by removing dust and foreign matter from the air introduced by the filter inner socket 115 is introduced. Therefore, it is possible to prevent contamination of the input material.

The gas generated in the cylinder 2 forcedly discharged by the air pressure injected into the main body 110 and the flow thereof is transferred to the inflow path 121a of the filter unit 120 side, and primarily by the primary filter 121b. The first filter part 121 of the filter part 120 is filtered and passes through the movement path 121c and the air blower 122a by the air pressure injected into the air injection hole 121d on the filter part 120 side. Inflow processing is performed in the second filter unit 122.

At this time, the air injected into the air injection hole (121d) of the first filter unit 121 side is introduced into the air injection groove 22 of the air blower (122a) and through the plurality of air through holes (23) the inner hollow (E3) Injected to the front of the) is transferred to the second filter unit 122 to induce the flow of air. The flow direction and the air pressure formed as described above serve to suck the gas and air introduced from the main body 110 to the first filter unit 121 and smoothly filter the exhaust gas by the primary filter 121b. To do it. In addition, since the primary filter 121b is formed of a gas identifying filter member which is discolored by gas, the primary filter 121b provides usefulness that can be easily visually confirmed whether discharge of generated gas in the cylinder 2 is performed smoothly.

The primary filtered gas flowing into the second filter unit 122 by the air injection and the action of the air blower 122a on the first filter unit 121 side is secondary by the secondary filter 122c mounted in plurality. The filter is filtered, and the secondary filter 122c has a function of sucking and removing noise by providing air pressure.

At this time, since the noise caused by the air pressure is sucked by the sound insulation material 122b of the second filter part 122 attached to the opposite point of the air blower 122a, the primary noise removal and reduction effect is exerted, and the secondary filter ( The filter socket 31 of 122c) exhibits secondary noise elimination and reduction effect by the resonance blocking effect in the inner hollow, and improves the suction and filtering efficiency of gas by installing a plurality of secondary filters 122c. You can double. In addition, the primary filter 121b and the secondary filter 122c exhibit a deodorizing function together with the filtering effect.

Therefore, the cylinder gas discharge device of the present invention can increase the filtering efficiency of the discharged gas while supplying the air pressure only when the metering signal of the injection machine and forcibly discharging the gas in the cylinder by using the flow pressure of the air, It can increase the gas discharge efficiency, prevent the occurrence of failure, and greatly reduce the product defects.

On the other hand, the cylinder gas discharge device according to the present invention has been described with reference to the specific embodiments as described above and the accompanying drawings, but is not particularly limited to this, within the similar category of the technical idea according to the claims of the present invention Various modifications of the person skilled in the art to be made may be attributed to the present invention.

According to the cylinder gas discharge device according to the present invention as described above, it is possible to discharge the gas in the cylinder by using the air pressure, but only in conjunction with the metering signal of the injection machine to perform the gas discharge and filtering, It can increase the efficiency of gas discharge in the cylinder, eliminate the trouble of the device and provide the usefulness to improve the operation efficiency of the device.

In addition, the present invention can remove the gas in the cylinder, as well as eliminate contamination due to material replacement, which can greatly reduce product defects, enable the molding of products without impurities, and facilitate the molding of precision parts, thin films, and lenses that were previously impossible. It provides usability that can be easily implemented, thus extending the application range for product molding.

Furthermore, the present invention not only exerts an effect of improving the environment of injection molding by filtering the exhaust gas and improving its efficiency, but also minimizes the gas inflow into the molding mold, thereby reducing mold contamination due to gas filling, thereby making the mold clean as well as the mold. It is possible to reduce maintenance and to provide usefulness that can be easily checked with the naked eye.

Claims (9)

In the injection molding cylinder gas discharge device for discharging the gas generated in the cylinder of the injection machine, A main body installed between the material injection hopper and the cylinder of the injection machine, the main body having a gas discharge structure to guide and discharge the gas in the cylinder by air pressure; A filter unit coupled to the main body unit to induce the inflow of the exhaust gas by air pressure and to filter the exhaust gas from the cylinder for the second time and to exhibit a noise removing effect; And a control unit configured to provide air pressure for inducing gas discharge into the cylinder, respectively, to the main body and the filter, and to control the air to be supplied only at the time of the metering signal of the injection machine. The method of claim 1, A main body portion having a material inlet and a gas outlet at upper and lower centers thereof, and an air inlet hole and an outside air inlet hole are formed at a side thereof, and a block body having an inner hollow; A material injection pipe communicating with the material injection hole of the block body and installed vertically and having a predetermined length; An air blower protruding from the side of the block body and connected to the hollow and air injection holes; An outside air inlet pipe installed vertically outside the material inlet pipe and connected to the outside air inlet hole and having a bottom surface formed with a plurality of perforations; The cylinder gas discharge device is fastened to the outside air inlet hole, characterized in that the filter built-in socket for removing dust and foreign matter from the inlet air. The method of claim 1, The filter unit forms an inlet path so that the gas sucked and discharged by the air pressure from the main body unit is installed, and a first filter is installed on the inlet path, and the first filtered path and the air injection hole are formed. A filter unit; An air blower connected to the movement path and the air injection hole of the first filter unit is built-in, and a soundproof material is attached to the opposite side of the air blower to filter the primary filtering gas introduced through the air blower and to make noise at the same time. A cylinder gas discharge device comprising: a second filter portion provided with a plurality of secondary filters for suction / removal. The method of claim 1, The control unit includes a main supply pipe and a branch pipe branched to the housing, one of the branch pipes is connected to the air injection hole of the main body portion and the other of the branch pipes to the air injection hole of the filter portion, the solenoid valve for each branch pipe Cylinder gas discharge device, characterized in that installed but connected to the relay receiving a control signal from the main control unit of the injection molding machine. The method of claim 2, The block body is a cylinder gas discharge device, characterized in that the inner bottom surface of the lower side inclined structure is configured so that the input material and dust does not flow down in the block body to stay. The method of claim 2, The material injection pipe is a cylinder gas discharge device, characterized in that the end is installed so as to maintain a gap of 10 ~ 15mm with the upper surface of the screw provided in the cylinder of the injection machine. The method of claim 2 or 3, The air blower is a pipe-shaped body having an internal hollow, and forms an air injection groove around an edge of the rear end of the body, but forms a plurality of air through holes for inducing air flow from the air injection groove to the front of the internal hollow. Cylinder gas discharge device, characterized in that. The method of claim 3, wherein The primary filter has a cover as an external form exposed to the outside and comprises a gas identifying filter member which discolors upon contact with the gas so that the gas can be visually checked at the same time as the filtering of the gas; The secondary filter is a cylinder characterized in that it is installed in the second filter portion and formed of an internal hollow filter socket formed with a plurality of through holes along the side circumference, and a carbon filter member mounted on the inner wall of the filter socket Gas exhaust device. The method of claim 3, wherein The sound insulation material is a cylinder gas discharge device, characterized in that consisting of a sponge or foam urethane of the egg plate structure.

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