JPH03189118A - Apparatus for discharging resin in injection molding machine - Google Patents

Abstract

PURPOSE:To improve working efficiency and to save labor by bringing a resin extruded from a nozzle by forwarding a screw into collision with a shielding plate and making it fall down onto a resin-cooling plate. CONSTITUTION:When a molding machine is stopped at the time when daily injection work is finished or a specification of a molded item is changed, for example, a heating cylinder 15 is pulled out from a nozzle hole 20 by retreating the whole injection apparatus 11. At this time, a molten resin remains between a screw and a nozzle 24 in a heated nozzle 15. Then, the screw is forwarded, the resin is extruded from the nozzle but as a shielding plate 51 exists, the apex of the extruded resin collides with the shielding plate while it is solidified a little. The resin is thereby broken and passes through a resin path between a nozzle 24 and the shielding plate 51 and falls down on a resin-cooling plate 50 and is finally solidified by cooling this resin-cooling plate 50. This cooled and solidified remaining resin is fallen in a shorter 46 and is accumulated in a discharged resin receiver 100.

Description

[Detailed Description of the Invention] [Industrial Application Field] The wooden device is used in an injection molding machine to discharge the resin remaining in the heating cylinder where the injection screw rotates to the outside of the machine when the molding operation is interrupted or finished. This invention relates to a resin discharging device.

[Prior Art] A conventional resin discharge device of an injection molding machine is shown in Figs. 5 to 7, in which Fig. 5 is a schematic side view of the injection molding machine, and Fig. 6 is a view from the exited heating cylinder side toward the fixed plate. FIG. 7 shows a front view of the resin discharging device as viewed from above, and a visual surface view shown in FIG. 6.

A pair of fixed plates 2.3 are erected on the machine base l, with their four corners connected by tie rods 4.
A movable platen 6 that moves forward and backward with respect to the fixed platen 3 is supported by a mold clamping cylinder 5 on the fixed platen 2 side.

Reference numerals 7 and 8 denote a fixed mold and a movable mold respectively attached to the fixed platen 3 and the movable platen 6, which are provided with a cavity 10 divided by a dividing surface 9, and are clamped by moving the movable platen 6 back and forth. .

It is configured to be opened. On the other hand, on the machine base l, an injection device, generally designated by reference numeral 11, is supported via a slide bed 12 so as to be freely advanced and retracted.
It is configured to move forward and backward in the near and far direction. Injection mount! The injection cylinder 111 includes an injection cylinder 13 fixed to the slide bed 12 and a cylindrical heating cylinder 15 with a heater 14 attached to the circumferential surface.
A screw 1 is attached to the piston rod 16, which moves forward and backward using hydraulic pressure.
7 are rotatably connected via a coupling 18. The screw 17 is inserted into the inner hole of the heating cylinder 15 so that its threaded portion can rotate and move forward and backward, and the injection cylinder 13
It is configured to move forward and backward by the rotational drive device i19 and rotated by the rotational drive device i19. The heating cylinder 15 is configured to be inserted into the sleeve hole 20 of the fixed platen 3 as the entire injection bag fill advances, and to be pulled out from the nozzle hole 20 and separated from the fixed platen as the entire injection bag fill retreats. ing. Further, excess resin that was not injected remains between the tip of the screw 17 in the heating cylinder 15 that has exited from the nozzle hole 20 and the nozzle 24.

A screw 17 is located in the space between the nozzle 24 of the heating cylinder 15 that has left in this state and the fixed platen 3.
A pedestal 30 for receiving the residual resin discharged from the nozzle 24 as the resin moves forward is installed at a low position so as not to interfere with the advancing and retracting heating cylinder 15, and in the discharge resin passage above the pedestal 30, A shielding device for the discharged resin, generally designated 31, is provided. That is, there are two brackets on the plane of the fixed platen 3 on the side of the injection device 11.
2.33 are fixed diagonally above and above the nozzle hole 20, respectively, and a shielding plate opening/closing cylinder 34 is pivotally attached to one bracket 32 so as to be swingable. An arm 36 having one free end pivotally attached to the working end of the piston rod 35 of the cylinder 34 is pivotally attached to the other bracket 33 . A circular shielding plate 37 having a semicircular protruding edge 37a is provided at the other end of the arm 36.
is fixed, and the piston rod 35 of the cylinder 34
By moving forward and backward, the shielding plate 37 is configured to move between a resin discharge passage blocking position shown by a solid line in FIG. 6 and a exit position from the passage shown by a chain line. Also,
A cylinder bracket 38 and a cylinder support 39, which are respectively fixed on the end of the pedestal 30 and a fixed part on the outside thereof, have an extrusion cylinder 40 located on the side of the resin discharge passage and arranged horizontally. The piston rod 41 is configured to move back and forth in the vicinity of the pedestal 30 perpendicularly to the direction of movement of the nozzle 24 using fluid pressure. A rectangular extrusion plate 42 is fixed to the working end of the piston rod 41 and is perpendicular thereto, and a pair of guide rods 43 extending parallel to the piston rod 41 from both ends are connected to the cylinder bracket. It is slidably supported by a bearing part 38a of 38. 44 is a cover that covers the moving part of the guide rod 43. With this configuration, when the piston rod 41 moves back and forth using fluid pressure, the extrusion plate 42 moves back and forth along the pedestal 30 to cross the resin discharge passage while shifting the rollers 45. Further, in the pedestal 30, a chute 46 connected to a resin accumulation place (not shown) is opened near the forward limit of the extrusion plate 42 shown by a chain line in FIG. An air blow nozzle 47 for cooling the resin is opened facing the extrusion plate 42. Reference numeral 48 denotes a resin cooling plate using cooling water attached to the back surface of the pedestal 30.

The operation of the resin discharging device configured as described above will be explained.0 For example, when stopping the molding machine at the end of the injection work on -day or when changing the specifications of the molded product, the entire injection device 11 along with the slide bed 12 must be shut down. The heating cylinder 15 is pulled out from the nozzle hole 20 by retreating, and at this time, there is a gap between the screw 17 inside the heating nozzle 15 and the nozzle 24.
Molten resin remains. Therefore, when the screw 17 is advanced, the resin is extruded from the nozzle 24, but at this time the shielding plate 37 is at the solid line position in FIG.

The tip of the extruded resin collides with the shielding plate 37 while being slightly solidified. As a result, the resin breaks and the nozzle 24
It falls onto the pedestal 30, which is the resin passage between the and the shielding plate 37, and
It is cooled and solidified by the cooling plate 48. Therefore, when pressure fluid is fed to the head end side of the extrusion cylinder 40, the extrusion plate 42 moves forward together with the piston rod 41 while being guided by the guide rods 43 and 45, and the pedestal 30
Since the chute 46 is opened at the forward limit position of the extrusion plate 42 where the upper resin is scraped up and extruded, the extruded resin is further cooled by air blown from the air blow nozzle 47 and then passed through the chute 46. Fall into the discharge resin receiver 10
Accumulated to 0.

After discharging the resin, the extrusion plate 42 is moved back to the solid line position in FIG. 6, and the screw 17 is moved back to a predetermined position. When the injection operation is resumed, pressurized fluid is fed to the rod end side of the cylinder 34, so that the piston rod 35 retreats and the shielding plate 37 exits to the chain line position in FIG. 6 via the arm 36. , so slide bed 12
At the same time, the entire injection device 11 is advanced, and the heating cylinder 1
5 into the nozzle hole 20, preparations for the injection work are completed.During this time, all operations can be carried out by pressing buttons or the like.

[Problems to be Solved by the Invention] However, in conventional injection molding machines configured as described above, resin remains between the screw and the nozzle in order to change the color of the resin when changing the specifications of the molded product. The molten resin must be discharged, so first the screw is advanced to extrude the molten resin from the nozzle, and the extruded resin collides with the shielding plate and falls onto the pedestal. in this case,
The first resin that falls onto the pedestal is cooled and solidified by the resin cooling plate that uses cooling water attached to the back of the pedestal, but the resin that falls one after another and accumulates becomes further away from the resin cooling plate and becomes difficult to cool. , the resin that falls and accumulates at the end will not solidify for a while. In this state, if the extrusion plate is moved forward to cause the resin accumulated on the pedestal to fall into the chute, the resin in the upper layer that has fallen and accumulated has not solidified and may adhere to the extrusion plate, or Because there is a gap between the extrusion plate and the pedestal, all the resin on the pedestal is not discharged, and when the extrusion plate moves forward, some of the resin on the pedestal goes to the back side of the extrusion plate and is not completely discharged. It turns out.

[Means for solving the problem] In order to solve this problem, a screw is rotated back and forth in a heating cylinder that enters the nozzle hole of the fixed plate from the horizontal direction, and the molten resin in the heating cylinder is heated. An injection device capable of injecting resin into the mold cavity from a nozzle at the tip of the heating cylinder, and a position where the discharge resin passage from the nozzle is blocked and a position between the fixed plate and the heating cylinder exited from the nozzle hole thereof, In an injection molding machine provided with a shielding plate for discharged resin that is driven to selectively occupy a position exiting from a discharged resin passage, in a lower area of the shielding plate,
A resin cooling plate is provided which is inclined and has a cooling path through which a cooling medium is introduced.

[Function] With this configuration, when the screw is advanced in the heating cylinder exited from the nozzle hole of the fixed plate to discharge the residual resin onto the pedestal at the end of injection work, etc., the residual resin on the pedestal is After the resin collides with the shielding plate positioned so as to enter the passage, it falls onto the inclined resin cooling plate, whereupon the fallen residual resin is cooled and solidified, and is discharged through the chute to the discharge resin receiver. When the injection work is resumed, the shielding plate can be moved out of the passage so that the heating cylinder will not be obstructed from moving forward.

[Example] Figures 1 to 4 show one embodiment of the resin discharge device according to the present invention, and Figure 1 is a front view of the resin discharge device viewed from the exited heating cylinder side toward the fixed position. , Fig. 2 is a ■Visual surface view of Fig. 1, Fig. 3 is a ■Visual surface view of Fig. 1, and Fig. 4 (a) is a perspective view when the inclined resin cooling plate is attached to the shielding plate. 4(b) respectively show the A observation surface view of FIG. 4(&).

Since the overall structure of the injection molding machine is the same as the conventional one shown in FIG. 5, a detailed explanation thereof will be omitted and only the parts related to the present invention will be explained below using the same figure.

Fixed with fixed mold 7 installed! A heating cylinder 15 of the injection device ff1ll, which is entirely movable together with the slide bed 12, is inserted into the nozzle hole 20 of No. 13. When the injection work is finished or interrupted, the slide bed 12 is moved and the heating cylinder 15 is configured to exit from the nozzle hole 20.

Further, excess resin that was not injected remains between the tip of the screw 17 in the heating cylinder 15 that has exited from the nozzle hole 20 and the nozzle 24.

The space between the nozzle 24 of the heating cylinder 15 that has left in this state and the stationary plate 3 is designated by the symbol 6 as a whole.
A shielding device is provided for the discharged resin, indicated at 0. This shielding device 60 includes a resin cooling plate 50. Shielding plate 51.
Shield plate drive cylinder 52. Bracket 53. Side guide car 5
4. Vertical guide car 55. Rail 57 and sliding rollers 58
Consists of etc.

A purge cover 62 with one end attached to the fixed platen 3 is provided between the fixed platen 3 and the injection device 111, and a safety door 63 is attached to the front side of the injection molding machine of this purge cover 62. An upper plate 61 is provided on the roof portion of the cover 62, and a shield drive cylinder 52 for driving the shield plate 51, a rail 57 for guiding the shield plate 51, and the like are provided. If it becomes necessary to change the material or the color of the resin due to a change in specifications, etc., move the screw 17 forward in order to discharge the molten resin remaining between the screw 17 and the nozzle 24 before changing the color. A shielding plate 51 is provided on the front surface of the stationary plate 3 to extrude the molten resin from the nozzle 24 and prevent the extruded resin from scattering into the nozzle hole 20 and the like. Resin scattering prevention plates 51a of appropriate length are attached to both sides of the shielding plate 51.

A slit-shaped hole is provided on the above-mentioned upper plate 61 and is perpendicular to the advancing and retreating direction of the nozzle 24, and the shielding plate 51 is inserted through this slit-shaped hole. A U-shaped joint 5 is fixed to the piston rod 52a at the tip of the shielding plate drive cylinder 52 via an L-shaped bracket 53 fixed to one end of the shielding plate drive cylinder 52.
The bottle is rotatably supported by a support shaft 52c of 2b. In addition, at the front and rear of the shielding plate 51, a horizontal guide wheel support stand 56 having a short L-shape is provided adjacent to the side surface of the shielding plate 51 in the longitudinal direction. A horizontal guide wheel 54 is attached to the end of a support shaft 56a with one end fixed to the support shaft 56a, and rotates between two rails 57 installed along the slit-shaped hole of the upper plate 61. The rail 57 and the shielding plate 51 are prevented from rubbing against each other.

Further, one end of the rail 57 is fixed to the shielding plate 51, and a vertical guide wheel 55 is provided at the other end so as to slide on the side end of the rail 57. By installing the horizontal guide wheel 54, it is possible to prevent longitudinal and lateral vibration.

On the other hand, the lower end of the shielding plate 51 is rotatably provided with a sliding roller 58 supported by a support shaft 58a so as to be able to move back and forth smoothly on the pedestal 30.

Further, a resin cooling plate 50 having a cooling passage 59 in the plate is arranged at an appropriate angle, for example, 50-7
It is fixed at 0 degrees. The fixed position of the resin cooling plate 50 is such that the screw 17 is advanced to extrude the molten resin from the nozzle hole 20 in order to discharge the molten resin remaining in the screw 17 and the nozzle hole 20III, and the extruded resin is shielded. It has an appropriate width so that when it falls to the bottom after colliding with the plate 51, it falls onto this resin cooling plate 50, and furthermore, the fallen molten resin is deposited on the resin cooling plate 50. The resin cooling plate 50 is provided so that it is constantly cooled and solidified and renewed one after another without any resin deposits.

The resin that has been cooled and solidified on the resin cooling plate 50 and has descended while sliding on the cooling plate 50 is placed on the pedestal 30.
The opening is opened so that the resin can be deposited through a chute 46 connected to the discharged resin receiver lOO shown in FIG. In order to solidify the molten resin, a cooling passage 59 as shown in FIGS. 2 and 4 is provided in the resin cooling plate 50, and this cooling passage 59 is connected to a cooling water pipe 67. The resin cooling plate 50 is constantly cooled.

Explaining the operation of the resin discharging device configured as above 0 For example, when stopping the molding machine at the end of the injection work on - day or when changing the specifications of the molded product, the entire injection device 11 along with the slide rod 12 The heating cylinder 15 is pulled out from the nozzle hole 20 by retracting the heating cylinder 15. At this time, there is a space between the screw 17 inside the heating nozzle 15 and the nozzle 24.
Molten resin remains. Therefore, when the screw 17 is advanced, the resin is extruded from the nozzle 24, but at this time, the shielding plate 51 is in the position shown by the solid line in FIG. It collides with the plate 51. As a result, the resin is bent and the nozzle 24 and the shielding plate 5
1 and falls onto the resin cooling plate 50, where it is cooled and solidified.

This cooled and solidified residual resin falls into the chute 46 and is collected in the discharged resin receiver 100.

After the resin is discharged, when working air or hydraulic oil is introduced into the piston head side of the shielding plate drive cylinder 52 from a conduit (not shown), the piston rod 52a moves forward, and the shielding plate 51 moves along the chain line in FIG. It will move to the position shown.

Since this shielding plate 51 is moved to the position indicated by the chain line in FIG.
By moving the entire device forward and inserting the heating cylinder 15 into the nozzle hole 20, preparations for the injection operation are completed. During this time, all operations can be performed by pressing buttons or the like.

In the present invention, a case has been described in which the cooling passage 59 is provided inside the resin cooling plate 50, but the invention is not limited to this, and the cooling passage 59 is provided on the back side of the resin cooling plate 50.
9 may be installed.

Furthermore, when changing the material or the color of the resin, in order to discharge the molten resin remaining between the screw 17 and the nozzle 24, if the molten resin is extruded from the nozzle 24 and collided with the shielding plate 51, this resin is Although the resin that falls onto the cooling plate 50 and comes in contact with the cooling plate 50 immediately begins to cool and harden, the resin that falls one after another and is deposited moves away from the resin cooling plate 50 and is difficult to cool down. By blowing air, liquefied nitrogen gas, etc. blown from an air blow nozzle 70 onto the surface of the resin deposited on the resin cooling plate 50 at a diagonally opposite position of the resin cooling plate 50 as shown in FIG. is completely solidified and will not adhere to other parts during discharge, making it possible to discharge it even more completely.

[Effects of the Invention] As is clear from the above description, according to the present invention, the discharged resin on the pedestal provided between the fixed plate of a horizontal injection type injection molding machine and the heating cylinder exited from the nozzle hole of the horizontal injection molding machine. In the passage,
A shielding plate is provided that is driven to selectively occupy a position where this passage is blocked and a position where it is withdrawn from this passage, and when the screw advances, the resin extruded from the nozzle collides with the shielding plate and is placed on the resin cooling plate. By simply dropping the resin into the machine, the fallen resin is cooled and solidified one after another, and is finally collected and collected in the discharged resin receiver via the chute, so it has a simple structure, and can be processed reliably, easily, and in a short time. This makes it possible to improve work efficiency and reduce labor.

[Brief explanation of drawings]

1 to 4 show one embodiment of the resin discharging device according to the present invention, FIG. 1 is a front view of the resin discharging device as seen from the exited heating cylinder side toward the fixed plate, and FIG. 2 is a front view of the resin discharging device. is the ■Visual surface view of Figure 1, Figure 3 is the ■Visual surface view of Figure 1, Figure 4 (1k) is a perspective view when the inclined resin cooling plate is attached to the shielding plate, and Figure 4 is the ■Visual surface view of Figure 1. Figure (b) shows the A perspective view of Figure 4 (JL), and Figures 5 to 7 show conventional examples, and Figure 5 is a schematic side view of the injection molding machine, and Figure 6 is a schematic side view of the injection molding machine. The figure shows a front view of the resin discharging device as seen from the exited heating cylinder side toward the stationary plate, and FIG. 7 shows a visual surface view of FIG. 6. 3...Fixed plate, 7...Fixed mold, 8...Movable mold, 10...
Cavity hole 1...Injection device, 15...
...Heating cylinder, 7...Screw,
20... Nozzle hole, 4... Nozzle,
30... cradle, 4... cylinder, 7.51... shielding plate, 40... extrusion cylinder, 2... extrusion plate, 46... ... Shooter, 0 ... Resin cooling plate, 2 ... Shield plate drive cylinder, 4 ... Lateral guide wheel, 55 ... Vertical guide Car, 7...Rail, 59...
cooling path. 0... Shielding device, 100... Discharged resin receiver.

Claims (1)

[Claims] an injection device capable of injecting molten resin in the heating cylinder from a nozzle at the tip of the heating cylinder into a mold cavity by rotating a screw back and forth in a heating cylinder that enters a nozzle hole of a fixed plate from a horizontal direction; Discharging resin is driven to selectively occupy a position where the discharge resin passage from the nozzle is blocked and a position where the discharge resin exits from the discharge resin passage between the fixed plate and the heating cylinder which has exited from the nozzle hole thereof. In the injection molding machine, a resin cooling plate is provided in a lower area of the shielding plate, the resin cooling plate being inclined and having a cooling path for introducing a cooling medium. Resin discharge device.