KR200334461Y1 - pre-plasticization type injection molding machine - Google Patents

Abstract

The present invention relates to a pre-plastic injection molding machine, and improves the conduit for sending the plasticized resin to the injection chamber, so that the injection is made without remaining residual plastic resin in the predetermined space of the injection chamber after injection. It is aimed at the injection molding operation.

To this end, a heating cylinder 100 having a plastic chamber 102 having a shear wall 104 therein and a screw 109 provided in the plastic chamber 102 to plasticize the synthetic resin material; In order to inject the plastic resin CR introduced from the plastic chamber 102, an injection chamber 122 having an injection wall 124 therein, and an injection driving body provided at the rear of the injection chamber 122 ( The injection cylinder 120 having the injection plunger 126 operated by 130 forms a predetermined angle through the nozzle adapter 140 coupling the nozzle 150 communicating with the injection wall 124 to the front end portion. Is coupled to the injection cylinder 120 is provided with a conduit 144 having an inlet 104a and an outlet 146a to communicate the shear wall 104 and the injection wall 124, the outlet on the injection wall 124 A plurality of branch conduits 146 having a plurality of (146a) is characterized in that formed in the conduit 144.

Therefore, the residual plastic resin (RCR) remaining in the predetermined space (S) during injection is pushed backwards, and the newly introduced plastic resin (CR) and the residual plastic resin (RCR) are mixed evenly up and down, and then injected during the next injection. However, residual plastic resin (RCR) does not remain continuously. As a result, the physical properties of the molded product are stably maintained and work replacement becomes easy, and thus the injection molding efficiency is improved.

Description

Pre-plasticization type injection molding machine

The present invention relates to a pre-plastic injection molding machine, and more particularly, to improve the conduit for sending the plasticized resin to the injection chamber, so that injection is made without residual plastic resin remaining in a predetermined space of the injection chamber after injection. The present invention relates to a plastic injection molding machine in which a more effective injection molding operation is performed.

In general, the pre-plastic injection molding machine is a plunger type and screw type of the composite type, as shown in Figure 1, by adopting the advantages of each of them is a device capable of rapid and stable injection molding. It is combined with the heating cylinder (1) having a screw (2) and the heater (4) in combination with the heating cylinder (1) in a V-shape, plasticizer (CR) that is plasticized in advance in the heating cylinder (1) It consists largely of an injection cylinder 10 with a plunger 12 for injection. In addition, the heating cylinder 1 is coupled to form a V-shape, the plasticizer chamber 6 is formed in the heating cylinder 1, the injection chamber 14 is formed in the injection cylinder 10, respectively, the nozzle adapter 20 Combined by mediation. When the plasticized plastic (CR) plasticized in the plastic chamber (6) is pressed by the screw (2) is injected through the conduit 24 of the nozzle adapter 20 connected to the plastic chamber 6 and the injection chamber 14 Supplied to the injection chamber 14 of the cylinder 10 and injected into the injection mold D through the nozzle adapter 20 and the nozzle 30 coupled to the front surface of the nozzle adapter 20 by the plunger 12. do. Also known as V-shaped injection molding machine.

The heating cylinder 1 is composed of a plastic chamber 6 in which a shear wall 8 is provided, and a screw 2 provided in the plastic chamber 6, and one side of the heating cylinder 1 is connected to the nozzle adapter 20. The other side is coupled to the drive motor 40 for rotating the screw (2) or leading, backward operation. In addition, in the heating cylinder 1, a hopper 50 for supplying plastic material to the plastic chamber 6 and a heater 4 for heating are coupled to the outer circumference, and the plastic material is driven in the plastic chamber 6. The melt is kneaded by the rotation of the screw 2 by 40 and the heating of the heater 4, and one side of the conduit 24 is advanced and pressed to the front end of the associated plastic chamber 6.

The injection cylinder 10 is composed of an injection chamber 14 having an injection wall provided therein and a plunger 12 provided in the injection chamber 14, and the front side of the injection cylinder 10 is connected to the nozzle adapter 20. ) Is coupled to form a predetermined angle, the injection unit 60 is coupled to the rear portion. The plunger 12 is operated by the injection propeller 60 to inject the plastic resin C.R flowing into the injection chamber 14 into the injection mold D through the nozzle 30.

The nozzle adapter 20 which couples the heating cylinder 1 and the injection cylinder 10 has a nozzle 30 coupled to the injection mold D at the front part, and has a V-shape at the rear part to form the heating cylinder 1. And injection cylinder 10 front part is coupled, respectively. Inside the conduit 24, which communicates with the front end wall 8 of the plastic chamber 6 and the upper part of the injection wall 16 of the injection chamber 14, the nozzle 30 and the injection wall 14 of the injection chamber 14 are connected. (16) Injection passages 22 are formed to connect the centers, respectively.

The conduit 24 is connected to the outlet 8a of the plastic resin CR formed at the front end of the plastic chamber 6 and has an inlet 24a formed on the injection wall 16 of the injection chamber 14. In addition, the injection passage 22 has an opening 22a formed in the center of the injection wall 16.

The plastic resin CR introduced through the inlet 24a of the conduit 24 formed on the injection wall 16 pushes the upper portion of the plunger head 12a to retreat the plunger 12 to eject the injection chamber 14. When the plastic resin (CR) is introduced into the injection chamber 14, the screw 2 of the plastic chamber 6 moves forward and blocks the outlet 8a of the shear wall 8 so that the plastic resin CR is injected. To prevent backflow. The retracted plunger 12 advances at high speed by the hydraulic operation of the injection propeller 60 and ejects plastic resin (C.R).

On the other hand, in order to maintain a constant pressure after injection, a predetermined space (S) is made between the injection wall 16 and the plunger head 12a of the injection chamber 14 to be made at the time of injection, which is the injection mold (D) This is to provide a constant pressure to the plastic resin (CR) so that the injection resin cooled in the inside does not produce a sink mark on the molded product.

However, in the predetermined space S, as shown in FIG. 2, the residual plastic resin RCR always remains after injection, and the residual plastic resin RCR is hopper that is retracted after injection. When a new amount of plastic resin CR is introduced into the injection chamber 14 by pressing a predetermined amount of synthetic resin material heated from 50 to the plastic chamber 6 again, the new plastic resin CR is laminated on the upper side. And remain easily in the predetermined space S without being ejected through the nozzle 30. Therefore, cleaning must be done in order to change the color of the plastic material, resulting in slow rearrangement, and thermally sensitive residual plastic resins (RCR) adversely affect the chemical structure, and in addition, change in physical properties and quality. It tends to be deteriorated, so it has problems such as adversely affecting the molded product when it is injected and partially in contact with the new plastic resin (CR).

The present invention is to solve this problem, by improving the conduit provided in the injection cylinder while communicating with the plastic chamber and the injection chamber so that no residual plastic resin remains in a predetermined space generated between the front end of the injection chamber and the plunger during injection, New plastic resin flows into the injection chamber at every injection, and it is injected from the injection chamber without remaining in the injection chamber to improve the adverse effects on the properties of the molded product due to the continuous retention of residual plastic resin, and to facilitate work replacement. The object is to provide a type injection molding machine.

Figure 1 shows a conventional plasticizer type injection molding machine.

Figure 2 shows a residual plastic resin is continuously remaining in the injection chamber in the conventional pre-plastic injection molding machine.

Figure 3 shows the line-type injection molding machine according to the present invention.

Figure 4 shows the structure of the injection chamber and the nozzle adapter according to the present proposal.

5 is an enlarged view of the structure of the nozzle adapter according to the present invention.

Figure 6 shows the branch conduit and the outlet of the conduit formed in the injection wall seen in the VI direction of FIG.

7 shows another embodiment of a conduit.

FIG. 8 shows the branch conduit and the outlet of the conduit seen from the Ⅷ direction of FIG. 7.

9 shows another embodiment of a conduit.

*** Explanation of symbols for main parts of drawing ***

100: heating cylinder 102: plastic chamber

104: shear wall 104a: inlet

109: screw 120: injection cylinder

122: injection chamber 124: injection wall

126: injection plunger 126a: plunger head

130: injection drive 140: nozzle adapter

142: injection path 142a: opening

144: conduit 146: branch conduit

146a: exit 146a1, 146a2: upper and lower exit

146b, 146c: upper and lower branch conduits

The present invention devised to achieve the above object, the plasticizer chamber having a shear wall therein for plasticizing the synthetic resin material, and a heating cylinder having a screw provided in the plastic chamber; A driving motor coupled to one side of the heating cylinder to lead rotation and forward and backward movement of the screw; An injection cylinder having an injection chamber having an injection wall therein and an injection plunger provided in the injection chamber and operated by an injection propulsion member provided at a rear side for injecting the plastic resin introduced from the plastic chamber; One side is provided with a nozzle is provided so that the plastic resin to be injected from the injection chamber into the injection mold, the other side of the heating cylinder and the injection cylinder is coupled to each other at a predetermined angle, inside the linking the injection chamber and the nozzle And a nozzle adapter having an injection passage having an opening in the injection wall, and a conduit in communication with the front wall and the injection wall, the conduit having two or more outlets opposed to the opening.

In addition, the conduit is characterized in that it has a plurality of branch conduits branched on the basis of the branch point in the middle, the outlet is formed.

In addition, the branch conduit, characterized in that having the same length with respect to the branch point.

In addition, the outlet is formed to face up and down the edge of the injection wall, characterized in that the diameter of the lower side is formed larger than that of the upper side.

In addition, the outlet is formed to face up and down the edge of the injection wall, characterized in that the number of the lower side is formed more than that of the upper side.

Therefore, during injection, the residual plastic resin in the predetermined space is continuously injected and new plastic resin is always introduced into the injection chamber.

Hereinafter, described according to the embodiment shown in the accompanying drawings, the pre-plastic injection molding machine according to the present invention is as follows.

Referring to FIGS. 3 to 7, the pre-plastic injection molding machine is configured to inject the pre-plasticized plastic resin (CR) introduced from the injection cylinder 120 and the heating cylinder 100 to plasticize the injected synthetic resin in advance. It is largely made of an injection cylinder 120 for injection into the mold (D). The heating cylinder 100 and the injection cylinder 120 are coupled to form a V shape through the nozzle adapter 140 having the nozzle 150 coupled to the front surface, and the screw 109 is provided on the heating cylinder 100. The plasticizer chamber 102 is formed in the injection cylinder 120, the injection chamber 122 is provided with an injection flanger 126, respectively, the plasticized plastic (CR) plasticized in the plastic chamber 102 is screwed ( 109 is supplied to the injection chamber 122 of the injection cylinder 120 through the conduit 144 of the nozzle adapter 140 associated with the plastic chamber 102 and the injection chamber 122, and the plunger ( 126 is injected into the injection mold D through the nozzle 150 coupled to the front surface of the nozzle adapter 140.

The heating cylinder 100 is composed of a plastic chamber 102 having a shear wall 104 therein and a screw 109 provided inside the plastic chamber 102 in order to plasticize the synthetic resin material, which is a raw material, The front end is connected to the nozzle adapter 140, the rear end is coupled to the drive motor 110 for rotating or moving the screw 109, backward. In addition, in the heating cylinder 100, a hopper 108 for precisely supplying synthetic resin material to the plastic chamber 102 and a heater 106 for plasticizing the injected synthetic resin material are coupled to the outer circumference, and the synthetic resin material is a plastic chamber ( Shear wall of the plastic chamber 102 in which the heat of shear generated by the rotation of the screw 109 in the 102 and the heating of the heater 106 are melted and one side of the conduit 144 is connected according to the rotation of the screw 109. Advancing to 104 is pressed. On the other hand, in the central portion of the shear wall 104, the hole is in communication with the conduit 144 is formed to form an inlet (104a), the pressurized plastic resin (CR) through the hole, that is, the inlet (104a) injection chamber 122 It is injected into). When a predetermined amount is introduced, the front end of the screw 109 is advanced and the inlet 104a is closed to prevent backflow of the injection plasticizer C.R.

The injection cylinder 120 has an injection chamber 122 having an injection wall 124 provided therein for injecting the plastic resin CR injected from the plastic chamber 102 and the injection chamber 122 inside the injection cylinder 122. Comprising an injection plunger 126 provided, the front end is coupled to the nozzle adapter 140 at a predetermined angle with the heating cylinder 100, the rear end is coupled with the injection propeller 130 associated with the plunger 126 have. The plunger 126 is piston-operated by the injection propeller 130 to inject the plastic resin CR introduced into the injection chamber 122 through the conduit 144 to the injection mold D through the nozzle 150. . The injection wall 124 has a convex shape with a convex central portion, and the outlet 146a and the opening 142a of the conduit 144 and the injection passage 142, which will be described later, communicate with each other. As shown in FIG. 3, the head 126a of the plunger 126 also corresponds to the injection wall 124 and is formed in a conical shape to facilitate injection. On the other hand, in order to maintain a constant pressure after the injection, a predetermined space (S) is made between the injection wall 124 and the plunger head 126a of the injection chamber 122 is made during the injection, this is the injection mold (D) This is to provide a constant pressure to the plastic resin (CR) so that the injection resin cooled in the inside does not generate a sink mark on the molded product.

In the nozzle adapter 140 that couples the heating cylinder 100 and the injection cylinder 120, the nozzle 150 connected to the injection mold D is coupled to the front end, and the rear end forms a V-shaped heating cylinder ( 100 and the injection cylinder 120 are respectively coupled. Inside the nozzle adapter 140, as shown in FIG. 4, injection of the yarn 152 formed through the center of the nozzle 150 and the center of the injection wall 124 of the injection chamber 122 in a transverse direction is performed. An injection passage 142 having an opening 142a in the wall 124 also communicates in a longitudinal direction with the front wall 104 of the plastic chamber 102 and the injection wall 124 of the injection chamber 122 in a substantially longitudinal direction. Conduits 144 having two or more outlets 146a opposed to 142a on the exit wall 124 are formed without interfering with the flow of the plasticizers CR, respectively.

The conduit 144 communicates with the plasticizer chamber 102 and the injection chamber 122 and is associated with an inlet 104a formed in the front wall 104 of the plasticizer chamber 102 and the injection wall 124 of the injection chamber 122. Has an outlet 146a formed on the sidewall, and as shown in FIG. 5, a branched conduit 146 is formed in the middle of the branching point P and the outlet 146a is formed on the injection wall 124. . On the other hand, the outlet 146a is formed to face up and down the edge of the exit wall 124. Residual plastic resin (RCR) that is left in the predetermined space (S) during injection is pushed backward and newly introduced plastic resin (CR) and residual plastic resin (RCR) are mixed evenly up and down and injected during the next injection, thus remaining Plastic resin (RCR) does not remain continuously. As shown in Fig. 6, the diameter of the outlet 146a and its lower side 146a1 is made larger than that of the upper side 146a2, which is a plastic resin introduced from the upper outlet 146a1 and the lower outlet 146a2. This is to prevent the residual plastic resin (RCR) from being continuously mixed in the predetermined space S of the injection chamber 122 by appropriately distributing the amount of CR). That is, since the length of the branch conduit 146b having the upper outlet 146a1 is longer than the length of the branch conduit 146c having the lower outlet 146a2, the amount of the plastic resin CR injected downward is increased to the upper side. The diameter D is configured to be equal to the dose of. In this configuration, when the residual plastic resin (RCR) in the predetermined space (S) is mixed with the plastic resin (CR) newly introduced to the upper side, it is pushed backward by the newly added plasticizer (CR) at the same time and easily mixed. Is done.

In another embodiment, as shown in FIG. 9, the outlet 146a is formed above and below the edge of the injection wall 124, and the number of the lower side 146a2 is greater than that of the upper side 146a1. To be more, a plurality of branch conduits 146 are formed to branch to the branch point (P). At this time, the upper and lower inflows are also the same, considering the diameters of the upper and lower outlets (146a1) and (146a2), and the residual plastic resin (RCR) is formed in a predetermined space (S) of the injection chamber 122. This is to prevent the occurrence of, and to facilitate the mixing more.

Meanwhile, as another embodiment, as shown in FIGS. 7 and 8, the branch conduits 146 are configured to have the same length with respect to the branch point P, which also has the same reason as described above.

Referring to Figures 3 to 6 the operation and effects of the pre-plastic injection molding machine according to the present invention configured as described above are as follows.

First, in the plastic chamber 102 of the heating cylinder 100, the synthetic resin material is calcined by the rotation of the heater 106 and the screw 109 and the conduit through the inlet 104a of the front wall 104 of the plastic chamber 102. 144 flows into. The plastic resin CR introduced through the conduit 144 having branch conduits 146b and 146c having outlets 146a1 and 146a2 formed above and below the injection wall 124 of the injection chamber 122, respectively. Due to the branch conduits 146b and 146c configured to have the same inflow amount in the injection chamber 122 into the 146a1 and the lower side 146a2, the lower portion of the plunger head 126a is pushed back to retract the plunger 126. In this case, the residual plastic resin (RCR) remaining in the predetermined space (S) is pushed backward at the same time and mixed with the upper inflow amount and the lower inflow amount. Subsequently, when the plastic resin CR is introduced into the injection chamber 122, the screw 109 of the plastic chamber 102 is advanced by the driving motor 110 to block the inlet 104a of the shear wall 104 and to eject the plastic. Prevent backflow of plastic resin (CR). The retracted plunger 126 advances at a high speed by the hydraulic operation of the injection propeller 130 and injects the plastic resin mixed with the residual plastic resin (RCR) and the new plastic resin (CR) into the injection mold (D). . At this time, in order to provide a constant pressure to the plastic resin (CR) so that the injection resin cooled in the injection mold (D) does not produce a sink mark on the molded product, the injection wall 122, the injection wall 124 and the plunger head When the predetermined space S is injected between 126a, the residual plastic resin RCR remaining in the predetermined space S is repeated in the above process and is not continuously left in the injection chamber 122. Is injected.

Therefore, residual plastic resin (R.C.R) of the predetermined space (S) does not remain continuously to provide a stable physical properties to the molded product.

As described above, according to the present invention by improving the conduit provided in the nozzle adapter while communicating with the plastic chamber and the injection chamber so that residual plastic resin does not remain in the predetermined space generated between the injection wall and the plunger of the injection chamber during injection, When a new plastic resin is introduced into the injection chamber, it is easily mixed with the residual plastic resin in the predetermined space, and the plasticizer is always injected at every injection without continuously remaining in the injection chamber.

As a result, the physical properties of the molded product are stably maintained and work replacement becomes easy, and thus the injection molding efficiency is improved.

Claims (5)

A heating cylinder (100) having a plastic chamber (102) having a shear wall (104) therein and a screw (109) provided in the plastic chamber (102) for plasticizing the synthetic resin material; A driving motor 110 coupled to one side of the heating cylinder 100 to lead rotation and forward and backward movement of the screw 109; In order to inject the plastic resin CR introduced from the plastic chamber 102, an injection chamber 122 having an injection wall 124 therein, and an injection driving body provided at the rear of the injection chamber 122 ( An injection cylinder 120 having an injection plunger 126 operated by 130; One side is provided with a nozzle 150 is provided so that the plastic resin (CR) injected from the injection chamber 122 into the injection mold (D), the other side the heating cylinder 100 and the injection cylinder 120 It is coupled to each other at a predetermined angle, the injection passage 122 and the nozzle 150 in the interior and the injection passage 142 having an opening 142a in the injection wall 124, and the shear wall 104 And an injection cylinder (120) communicating with the injection wall (124), the injection cylinder (120) having a conduit (144) formed with at least two outlets (146a) opposed to the opening (142a). Molding machine. The method of claim 1, The conduit 144 is branch line type injection molding machine characterized in that it has a plurality of branch conduits 146 formed in the outlet branch (146a) branched on the basis of the branch point (P) in the middle. The method of claim 2, The branch conduit 146, the line-type injection molding machine, characterized in that having the same length with respect to the branch point (P). The method of claim 1, The outlet 146a is formed above and below the edge of the injection wall 124, and the diameter of the lower side 146a2 is larger than that of the upper side 1462 is formed. Molding machine. The method of claim 1, The outlet 146a is formed above and below the edge of the injection wall 124, wherein the number of the lower side 146a2 is more than that of the upper side 146a1 Molding machine.