JP4332675B2 - Method and apparatus for shutting off gas by supplying resin material with resin molding machine - Google Patents

Description

  The present invention relates to a method and apparatus for supplying a resin material with a resin molding machine and blocking gas, and more specifically, in a resin molding machine such as an injection molding machine or a hollow molding machine, the resin material Regarding the device that aims at both the supply of pellets and the shut-off of gas, the technology that takes into consideration that the resin material pellets are not pinched or bitten when the resin material is supplied and the gas is shut off is described. Is.

  Conventionally, as a technique related to a method and an apparatus for shutting off gas by supplying a resin material with a resin molding machine, a general resin molding machine as shown in FIG. 5 and a cylinder shutter as shown in FIG. There are some which stop the resin and shut off the gas by opening and closing.

  In this case, in a general resin molding machine as shown in FIG. 5, various defects such as black spots, burns, discoloration, yellowing, and fish eyes occur due to oxidation of the molten resin in the plasticizing cylinder 11. In order to prevent this, the nitrogen gas 152 is fed into the plasticizing cylinder 11 through the nitrogen gas pipe 121. In order to hold the fed nitrogen gas 152, the plasticizing cylinder 11 needs to be shielded from outside air as much as possible. However, if the resin material is left at the bottom of the hopper 30, the nitrogen in the plasticizing cylinder 11 is left. The gas concentration could be maintained at a predetermined value.

  In addition, as shown in FIG. 6, the one that stops the resin and shuts off the gas by opening and closing the shutter by the cylinder has recently used a suction loader 20 that is a resin material supply device. Not only the nitrogen gas 152 in the plasticizing cylinder 11 was sucked, but also outside air was often sucked from the gap of the ground portion at the rear of the plasticizing cylinder 11. Therefore, in order to prevent this, a blocking device 60 constituting a shutter 61ba is provided between the suction loader 20 and the plasticizing cylinder 11, thereby blocking the gap therebetween. The resin material 153 was sent into the plasticizing cylinder 11 by opening.

  When the introduction of the resin material 153 is started by operating the suction type loader 20 to suck the suction air 171, the electromagnetic valve 63 is immediately operated by the electric signal for starting the suction, whereby the shutter 61 ba is moved in the closing direction. Air, which is a gas, was sent from the pump 64 to the cylinder 61 so as to move. Further, when the operation of the suction type loader 20 is stopped, the electromagnetic valve 63 is caused to perform another operation by stopping the transmission of the electric signal, and unlike the case of FIG. 6, the pump 61 to the cylinder 61 so that the shutter 61ba is opened. The air which is gas was sent to.

  However, the conventional method and apparatus for supplying a resin material and shutting off gas with a resin molding machine have the following problems.

  That is, the shutter 61ba constituting the device forms the piston rod 61b together with the rod main body 61bb and the piston 61bc, and constitutes the cylinder 61 that operates by air pressure together with the cylinder main body 61a. The pellet which is the resin material 153 is sandwiched, the pellet is cut and pulverized to generate a fine powder of the resin material 153, and sometimes the resin material 153 is bitten and the apparatus does not move. The fine powder of the resin material 153 generated here has a high activity and a property of being easily oxidized. Therefore, it included a contradiction that the device itself intended to prevent the failure itself created another cause of the failure.

  Moreover, the resin material 153 which became a fine powder was kneaded by the operation of the shutter 61ba to form a lump. And they were carbonized and deposited in the molded product to make defective products.

  Furthermore, the shutter 61ba is often made of metal, and fine metal powder generated by wear is mixed into the resin due to sliding of the shutter 61ba, which causes a defect.

  In addition, when looking at the shape of the cylinder 61 and the blocking plate 62 that are components of the blocking device 60, the resin material 153 that passes through the plasticizing cylinder 11 as a raw material is adversely affected by steps and unevenness. I was receiving. That is, the resin material 153 and the fine powder of the resin material 153 are retained by steps or irregularities, and carbonized by leaving the residence for a long time as it is, causing a defect.

The present invention is a method of supplying a resin material with a resin molding machine and shutting off the gas so that the position before the resin material is fed into the plasticizing cylinder 11 can be supplied in a form in which the resin material can easily flow. In addition, as the gas flow in and out, the original natural shape was maintained so that it could easily flow and open, and at other times, the flow of the resin material was stopped and the gas flow was closed so as to block the flow of gas. The state of being brought into close contact and being in close contact is due to the application of external force to the outside of the cylindrical elastic elastic rubber 41 in which the resin material is flowing. The high pressure gas is filled in the sealed pressurizing chamber 40a outside the elastic rubber 41, and the high pressure gas is nitrogen gas. Within the plasticizing cylinder 11 By wherein the feeding in is had to solve the above problems.

Further, the present invention provides an apparatus for supplying a resin material by a resin molding machine and shutting off gas, and a cylinder 42 is provided before the resin material is fed into the plasticizing cylinder 11, and the inside of the cylinder 42 is further provided inside. A stretchable elastic rubber 41 is provided in which a resin material is flowing and the notch or uneven portion to which the resin material adheres is not formed, and the elastic rubber 41 has a shape in which the resin material easily flows in some cases. In order to supply the gas, the gas flows in and out so that it flows easily and keeps its original natural shape. At other times, the flow of the resin material is stopped and the gas flow is shut off. Similarly, the elastic rubber 41 is brought into close contact with the opening / closing means 40 a, 45, 46, and the opening / closing means 40 a, 45, 46 are connected to the inside of the cylinder 42 by the operation of the electromagnetic valve 46 from the nitrogen gas generator 45. The bullet Characterized in that due to discharge or filling a sealed pressure chamber 40a high pressure nitrogen gas 154 of high pressure between the outside of the rubber 41, further, the high pressure nitrogen gas 154 after use In order to prevent oxidation of the molten resin, the above problem is solved by feeding the inside of the plasticizing cylinder 11 through the nitrogen gas pipe 121.

  As is clear from the above description, the present invention can provide the following effects.

  First of all, the position before the resin material is fed into the plasticizing cylinder is the original natural shape so that in some cases the resin material can be supplied in a form that allows it to flow easily, and as the gas enters and exits it can easily flow and open. In other cases, it was in close contact with the original natural shape by stopping the flow of the resin material and shutting off the gas flow at other times. By responding only with simple shape changes such as the state, the resin material pellets are sandwiched, the pellets are cut and pulverized to generate fine powder of the resin material, and sometimes the resin material biting device moves About disappearing, it no longer occurs.

  Secondly, the state of close contact is caused by applying an external force to the outside of the cylindrical elastic elastic rubber in which the resin material flows inside, and further the resin material flows inside. This is achieved by energizing the existing cylindrical shape memory alloy, so that the operations of supply, release, stop and shut-off are ensured. In addition, the resin material and the fine powder of the resin material are no longer retained by steps or irregularities.

  Third, applying force from the outside is by filling the sealed pressurized chamber outside the elastic rubber with a high-pressure gas, or arranging a reciprocating cylinder outside the elastic rubber. Thus, the operation of supplying, opening, stopping, and shutting down is more reliable. In addition, the resin material and the fine powder of the resin material are no longer retained by steps or irregularities.

  Fourth, the high pressure gas is nitrogen gas, and after use it is sent to the inside of the plasticizing cylinder to prevent oxidation of the molten resin. Can be used effectively for supply, open, stop and shut-off operations.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a diagram showing resin supply and gas release by pressurization of the present invention, and FIG. 2 is a diagram showing resin stoppage and gas shut-off by pressurization of the present invention. FIG. 3 is a diagram showing resin supply and gas release by the shape memory alloy of the present invention, and FIG. 4 is a diagram showing resin stoppage and gas interruption by the shape memory alloy of the present invention. .

(First embodiment)
As shown in FIGS. 1 and 2, reference numeral 40 denotes a rubber cylinder shutter, which is composed of an elastic rubber 41 and a cylinder 42 that can be expanded and contracted, and a pressure chamber 40 a sealed between the elastic rubber 41 and the cylinder 42. Forming. In this case, a nitrogen gas supply port 42a is formed in the cylinder 42 so that a high-pressure nitrogen gas 154 having a high pressure flows in. Although not specifically shown in FIGS. 1 and 2, both an elastic rubber 41 having hooks for attachment at both ends and a cylinder 42 having hooks for attachment at both ends are provided as an injection plate. 14 and the loader mounting plate 21 are fixed with a plurality of bolts. As a matter of course, consideration is given to sealing between the elastic rubber 41 and the loader mounting plate 21 and the injection plate 14 so that the nitrogen gas 151 does not leak.

  By the way, high-pressure nitrogen gas 154 having a high pressure is caused to flow into the pressurizing chamber 40a, so that the high-pressure nitrogen gas 154 is filled on the outside of the elastic rubber 41 that can be expanded and contracted. In this way, it is possible to achieve a close contact state at the center portion, whereby the supply of the resin material 153 from the suction loader 20 to the plasticizing cylinder 11 is stopped and the plasticizer cylinder 11 flows to the suction loader 20. The entrance and exit of the nitrogen gas 151, which is a gas, is blocked.

  On the other hand, the pressurized state is eliminated by discharging the high-pressure nitrogen gas 154 from the pressurizing chamber 40a, and the elastic rubber 41 is returned to the original natural shape as seen in FIG. As the resin material 153 can be supplied from the suction loader 20 to the plasticizing cylinder 11 in an easy-to-flow manner, the nitrogen gas 151 that is a gas is released by easily flowing from the plasticizing cylinder 11 to the suction loader 20. It is made to do.

  What is important here is that the shape of the elastic rubber 41 before pressurization is a simple cylindrical shape on both the inner side and the outer side except for the wrinkles at both ends, and the resin material 153 passes through the inner side. However, the resin material 153 does not have a notched or uneven shape that may adhere or remain.

  The high-pressure nitrogen gas 154 flows into the pressurizing chamber 40a from the nitrogen gas pipe 165 connected to the nitrogen gas supply port 42a forming the cylinder 42. In this case, high-pressure nitrogen gas flows from the nitrogen gas generator 45 to the pressure reducing valve 47 and the electromagnetic valve 46 through the nitrogen gas pipes 161 and 163. The pressure reducing valve 47 is connected to the nitrogen gas piping 121 from the nitrogen gas piping 162 to supply the nitrogen gas 151 decompressed to the atmospheric pressure level to the inside of the plasticizing cylinder 11.

  Further, from the electromagnetic valve 46, the elastic rubber 41 is compressed as shown in FIG. 2 by connecting the nitrogen gas pipe 165 to the nitrogen gas supply port 42a and supplying the high-pressure nitrogen gas 154 having a high pressure to the pressurizing chamber 40a. Alternatively, as another option of the electromagnetic valve 46, the elastic rubber 41 is made to flow in FIG. 1 by discharging the high-pressure nitrogen gas 154 from the pressurizing chamber 40a through the nitrogen gas pipe 165 connected to the nitrogen gas supply port 42a. As can be seen, after passing through the electromagnetic valve 46 while maintaining the original natural shape, the nitrogen gas pipe 164 joins the nitrogen gas pipe 162. In this case, the exhausted high-pressure nitrogen gas 154 can be considered to pass through the pressure reducing valve 47 or another pressure reducing valve for the purpose of reducing the pressure to atmospheric pressure.

  The nitrogen gas generator 45 may be a tank or cylinder that stores nitrogen gas, or may be a system that creates nitrogen gas by sending compressed air to the separation membrane. A method of generating nitrogen gas by feeding into the apparatus may be used.

  In addition, the pressurizing chamber 40a, the nitrogen gas generating device 45, and the electromagnetic valve 46 mean opening / closing means 40a, 45, 46 that create the states of FIGS. 1 and 2 by operating the rubber cylinder shutter 40, By operating the electromagnetic valve 46 from the nitrogen gas generator 45, the high-pressure nitrogen gas 154 having a high pressure is charged or discharged into the sealed pressurizing chamber 40a between the inside of the cylinder 42 and the outside of the elastic rubber 41, thereby being elastic. The rubber 41 can be brought into close contact or returned to its original natural shape.

  On the other hand, the nitrogen gas pipe 121 is intended to feed the nitrogen gas 151 into the plasticizing cylinder 11. Therefore, there is no fear that the molten resin in the plasticizing cylinder 11 is oxidized.

  By the way, as a method of bringing the elastic rubber 41 into close contact, it is not necessary to be limited to filling the pressurizing chamber 40a with the high-pressure nitrogen gas 154 having high pressure. Instead of the high-pressure nitrogen gas 154, compressed air or other high-pressure gas is used. You may fill. Further, by arranging a reciprocating cylinder on the outer side of the elastic rubber 41, it is possible to operate it so that the elastic rubber 41 is brought into close contact with the stroke end. Therefore, it can be said that these are also open / close means.

  A suction loader 20 that introduces and stores the resin material 153 via the loader mounting plate 21 is disposed above the rubber cylinder shutter 40. In this case, the suction loader 20 is disposed for the purpose of introducing the resin material 153 into the interior by discharging the suction air 171 from the suction port 20a. When suction of the suction air 171 is started, suction starts. The electromagnetic valve 46 is immediately actuated by this electrical signal, whereby the high pressure nitrogen gas 154 is sent from the nitrogen gas generator 45 to the pressurizing chamber 40a so that the elastic rubber 41 is compressed and brought into close contact therewith.

  The method and apparatus for supplying the resin material and shutting off the gas with the resin molding machine according to the present invention are configured as described above, and the operation thereof will be described below.

  First, as a precondition, the internal pressure of the plasticizing cylinder 11 is connected to the atmosphere from the ground and the like, and is almost in the state of atmospheric pressure. Therefore, the nitrogen gas from the nitrogen gas generator 45 flows at a pressure of about 0.6 to 0.8 MPa. However, the nitrogen gas that has passed through the pressure reducing valve 47 is reduced in pressure to about atmospheric pressure. The gas 151 flows into the plasticizing cylinder 11 through the nitrogen gas pipes 162 and 121.

  By the way, at the time of injection molding operation as an example, the resin molding machine 10A is driven to start the plasticizing process. That is, when the heater arranged for the purpose of heating is energized and the screw 12 is rotated, the resin material 153 in the suction loader 20 passes through the rubber cylinder shutter 40 and the material supply port plate 13 and becomes a plasticizing cylinder. 11 is transferred to the front nozzle side along the spiral groove 12a of the screw 12 in the fuse 11, melted and kneaded by heating and shearing action, and sequentially stored in the molten resin storage part on the front side of the screw head. During this time, the screw 12 is retracted by the pressure of the molten resin in the reservoir. Here, when the predetermined molten resin is stored, the rotation of the screw 12 is stopped, and the plasticizing process is ended.

  Next, when a forward force is applied to the screw 12 by the axial drive unit of the screw drive device, the stored molten resin passes through the nozzle and is injected into the cavity of the mold, and an injection process is performed. At this time, the backflow prevention ring prevents the stored molten resin from flowing back to the material supply port plate 13 side by being pressed against the front end portion of the press plate. Accordingly, the pressure is higher in the front than the backflow prevention ring in the plasticizing cylinder 11, but the pressure behind the backflow prevention ring is about atmospheric pressure. Further, the ratio of the unmelted resin increases toward the material supply port plate 13 behind the backflow prevention ring, and only the unmelted resin is present in the vicinity of the material supply port plate 13. In particular, in the vicinity of the material supply port plate 13, the resin fed into the plasticizing cylinder 11 is in a state with many voids.

  On the other hand, when the suction loader 20 is operated and the suction of the suction air 171 is started from the suction port 20a so that the resin material 153 is introduced into the suction loader 20 from the material inlet 20b, the suction start electric signal is generated. Immediately actuate the solenoid valve 46 and send high-pressure nitrogen gas 154 from the nitrogen gas generator 45 to the pressurizing chamber 40a from the nitrogen gas supply port 42a via the nitrogen gas pipes 161 and 163, the solenoid valve 46 and the nitrogen gas pipe 165. Fill. As a result, as shown in FIG. 2, the elastic rubber 41 is compressed and brought into close contact with the central portion, thereby stopping the supply of the resin material 153 from the suction loader 20 to the plasticizing cylinder 11 or from the plasticizing cylinder 11. The nitrogen gas 151 which is the gas flowing to the suction loader 20 can be shut off.

  Here, when the operation of the suction loader 20 is stopped, the electromagnetic valve 46 is caused to perform another operation by stopping the transmission of the electrical signal that has been transmitted so far, and the pressurizing chamber 40a is filled. High-pressure nitrogen gas 154 is sent from the nitrogen gas supply port 42 a to the electromagnetic valve 46 via the nitrogen gas pipe 165, and further merged from the electromagnetic valve 46 to the nitrogen gas pipe 162 via the nitrogen gas pipe 164 to form the nitrogen gas 151. This is sent to the inside of the plasticizing cylinder 11 via the nitrogen gas pipe 121. As a result, the elastic rubber 41 returns to the original natural state as seen in FIG.

  In addition, nitrogen gas 151 is constantly fed into the plasticizing cylinder 11 from the nitrogen gas generator 45 via the nitrogen gas pipe 161, the pressure reducing valve 47, the nitrogen gas pipe 162, and the nitrogen gas pipe 121, and the molten resin Prevents oxidation.

(Second embodiment)
As shown in FIGS. 3 and 4, reference numeral 50 denotes a shape memory alloy cylinder shutter, which includes a shape memory alloy 51 and a cylinder 52. In this case, the cylinder 52 is for supporting the suction type loader 20 and the loader mounting plate 21 disposed in the upper part thereof, and may be a cylinder including a cylinder or a plurality of columns. Although not specifically shown in FIGS. 3 and 4, the shape memory alloy 51 and the cylinder 52 are fixed to the injection plate 14 and the loader mounting plate 21 with a plurality of bolts, or the column itself is used as a bolt. It is also possible. As a matter of course, consideration is given to sealing between the shape memory alloy 51 and the loader mounting plate 21 and the injection plate 14 so that the nitrogen gas 152 does not leak.

  Further, the shape memory alloy 51 is connected to the wirings 57 and 58 via the switch 56 from the power source 55 so as to be energized. In this case, although not specifically shown in FIGS. 3 and 4, an electric signal is sent to the switch 56 in response to the operation of the suction loader 20 by connecting to the control device. Other configurations are the same as those in the first embodiment, and are omitted.

  The method and apparatus for supplying the resin material and shutting off the gas with the resin molding machine according to the present invention are configured as described above, and the operation thereof will be described below.

  In this case, the driving of the resin molding machine 10B is the same as the driving of the resin molding machine A of the first embodiment, and is therefore omitted.

  First, when the suction loader 20 is operated to start suction of the suction air 171 from the suction port 20a so that the resin material 153 is introduced into the suction loader 20 from the material inlet 20b, an electrical signal for starting suction is obtained. Then, the switch 56 is immediately actuated to make it energized. As a result, the shape memory alloy 51 is brought into close contact with the central portion as shown in FIG. 4 to stop the supply of the resin material 153 from the suction loader 20 to the plasticizing cylinder 11 or plasticize with the suction loader 20. The nitrogen gas 152 that flows between the cylinders 11 can be shut off.

  On the other hand, when the operation of the suction loader 20 is stopped, the switch 56 is disconnected by stopping the transmission of the electrical signal that has been transmitted so far, and the shape memory alloy 51 is in its original shape as seen in FIG. Then, the resin material 153 is supplied or the nitrogen gas 152 which is a gas is released.

  The position before the resin material is sent to the plasticizing cylinder is kept in its original natural shape so that the resin material can be supplied in a form that allows it to flow easily and in some cases the gas flows in and out easily. In other cases, the resin material is placed in close contact so as to stop the flow of the resin material and to block gas in and out, so that the resin material pellets are sandwiched, or the pellets are cut and pulverized to obtain a resin. The generation of fine powders of materials, and sometimes the intrusion of the resin material, the device does not move at all, and it has become possible to produce high-quality molded products.

  The figure which showed supply of resin and release of gas by pressurization of the present invention   The figure which showed stop of resin and interception of gas by pressurization of the present invention   Diagram showing resin supply and gas release by the shape memory alloy of the present invention   The figure which showed the stop of resin and interruption | blocking of gas by the shape memory alloy of this invention   Conventional general resin molding machine   Diagram showing stopping of resin and blocking of gas by opening and closing shutter with conventional cylinder

Explanation of symbols

10A: Resin molding machine 10B: Resin molding machine 10C: Resin molding machine 10D: Resin molding machine 11: Plasticizing cylinder 12 ... ... Screw 12a ... Spiral groove 13 ... Material feed port plate 14 ... Injection plate 20 ... Suction loader 20a ... Suction port 20b ··· Material inlet 21 ··· Loader mounting plate 30 ··· Hopper 40 · · · Rubber cylinder shutter 40a · · · Pressurizing chamber (opening / closing means)
41 ··· Elastic rubber 42 ··· Cylinder 42a ··· Nitrogen gas supply port 45 ····························································
46 ... ・ Solenoid valve (opening / closing means)
47 ······················ 50 ·········································································································・ ・ ・ ・ Switch 57 ・ ・ ・ ・ ・ ・ Wiring 58 ・ ・ ・ ・ ・ ・ Wiring 60 ・ ・ ・ ・ ・ ・ Cut-off device 61 ・ ・ ・ ・ ・ ・ Cylinder 61a ・ ・ ・ ・ ・ Cylinder body 61b ・ ・ ・··· Piston rod 61ba ··· Shutter 61bb ··· Rod body 61bc ··· Piston 62 ··· Blocking plate 63 · ··· Solenoid valve 64 ··· Pump 121 ·················································································································································································································· 162 Nitrogen gas piping 163 Nitrogen gas pipe 164 ... Nitrogen gas pipe 165 ... Nitrogen gas pipe 166 ... Air pipe 167 ... Air pipe 168 ... Air pipe 169 ...・ Air piping 171 ... Suction air 172 ... Exhaust gas 173 ... Exhaust gas

Claims (3)

In the method of supplying the resin material with a resin molding machine and shutting off the gas, the position before the resin material is sent to the plasticizing cylinder (11) is also gas so that the resin material can be supplied in a form that can easily flow. In the state of keeping the original natural shape so that it flows and opens easily as it enters and exits, in other cases it is in a state of close contact so as to stop the flow of resin material and to block the flow of gas The state of being in close contact is due to the application of external force to the outside of the cylindrical elastic elastic rubber (41) in which the resin material flows inside. The high pressure gas is filled in the sealed pressurizing chamber (40a) outside the elastic rubber (41), and the high pressure gas is nitrogen gas. After use, the molten resin is oxidized. To prevent the plasticized cylinder ( How to shut off the supply to the gas the resin material in the resin molding machine, characterized in that for feeding the inside of the 1). In an apparatus for supplying a resin material by a resin molding machine and shutting off gas, a cylinder (42) is provided before the resin material is fed into the plasticizing cylinder (11), and the inside of the cylinder (42) is further provided inside. A stretchable elastic rubber (41) that is not formed with notches or irregularities where the resin material is flowing and to which the resin material adheres is disposed, and the elastic rubber (41) is sometimes a resin material. In order to supply the gas in an easy-to-flow form, and as the gas flows in and out, it keeps its original natural shape so that it can easily flow and open, and at other times it stops the flow of the resin material. The elastic rubber (41) is brought into intimate contact with the opening / closing means (40a, 45, 46) so as to block entry and exit, and the opening / closing means (40a, 45 , 46) is connected to the nitrogen gas generator (45). Front by the operation of the solenoid valve (46) Cylinder that is by discharging or filling (42) inside said elastic rubber high pressure nitrogen gas (154) of pressure to the sealed pressure chamber (40a) between the outer (41) of A device that cuts off gas by supplying resin material with a resin molding machine. The high pressure nitrogen gas (154) is later used to claim 2, wherein the feeding to the inside of the plasticizing cylinder by way of the nitrogen gas pipe (121) to prevent oxidation of the molten resin (11) The apparatus which supplies resin material with the resin molding machine of description, and shuts off gas.

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