JPH0354899Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field to which the invention pertains> The present invention relates to a purging shoe for discharging purge resin extruded from a nozzle to the outside of the machine when changing the color or resin of an injection molding machine.

<Prior Art> The conventional method will be explained with reference to FIGS. 6 and 7. Reference numeral 11 is a barrel equipped with a nozzle 12, and the barrel 11 moves forward and backward on the extension line A of the nozzle, and repeats the nozzle touch and nozzle retreat operations. This is for purging residual resin etc. inside. Reference numeral 13 designates a nozzle touch plate which is traversed by an air cylinder 14 on the extension line A of the nozzle during purging to close the tip of the nozzle 12. Reference numeral 15 denotes a purging chute that allows the material purged from the nozzle 12 to slide down and be discharged out of the machine. 16 is a fixed plate; 17 is a stopper located at the forward limit of the nozzle touch plate 13; 18 and 19 are the forward limits of the nozzle touch plate 13, respectively;
This is a limit switch for detecting the return limit position. 20
is an electromagnetic switching valve that performs switching control of air from the air source 21 to be applied to the air cylinder 14.
22 and 23 are air nozzles for blowing out the purge material on the purge chute 15, respectively;
The purge material pushed out from the nozzle is blown off to the outside of the aircraft or onto the purge chute 15, and is connected to the air source 2 via the electromagnetic switching valve 24 and the flow rate adjustment valve 25.
1 is connected.

The structure is as described above, and its operation will be explained. First, when the electromagnetic switching valve 20 is energized and set to the B position, air from the air source 21 acts on the air cylinder 14, and the nozzle touch plate 13
moves forward, crosses the extension line A of the nozzle 12, and is stopped at a predetermined position by the stopper 17 and limit switch 18. The stop signal from the limit switch 18 excites the electromagnetic switching valve 24, and air is blown out from the air nozzles 22 and 23.

Then, the nozzle 12 moves forward as shown by the chain line,
When the nozzle is touched to the nozzle touch plate 13 and a screw (not shown) is rotated to increase the back pressure and metering is performed, the nozzle 12 is retracted and then injection (purging) is performed.

In this way, the nozzle advances, retreats, and metered injection is repeated many times, and the purging material is discharged from the nozzle touch plate 13 through the purging chute 15 to the outside of the machine by air blowing. When purging is completed, the solenoid valve 24 is turned OFF, the air blowing from the air nozzles 22 and 23 is stopped, the purging plate 13 is also moved back from the nozzle extension line A, and the nozzle 12 is placed on the back side of the purging plate 13 during the purging operation. Nozzle 1
2 and the mold gate, which could not be contacted, can now be brought into contact with the mold gate, allowing normal molding operation.

<Problems to be solved by the invention> However, most of the purged resin hardens on the surface due to air blowing and slides down the chute, but some of it does not harden and sticks to the chute. , which poses a hindrance to today's stable continuous unmanned operation.

An object of the present invention is to provide an apparatus in which purged resin can reliably slide down without adhering to the chute.

<Means for Solving the Problems> In order to achieve the above-mentioned object, in the present invention, during the purging operation, the tip of the nozzle is blocked by using air or a hydraulic cylinder across the extension line of the nozzle, and the nozzle is The purging chute is characterized in that, in the purge chute which receives purge material extruded from the tank at its lower part, the chute member has a hollow shape, and a coolant passage is provided in the hollow.

<Function> Since the structure is as described above, for example, when water is poured into the hollow of the chute member, the purged resin is cooled and solidified, and does not adhere to the chute.

<Embodiment> Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the description, the same members as in the conventional example will be omitted from description and will be given the same numbers as in the conventional example. Reference numeral 30 denotes a movable chute, which is moved across the extension line of the nozzle 12 by the air cylinder 31 during purging, and
The position shown in the figure changes to the position shown in FIG. 2, so that the front end of the nozzle is blocked. 32 is a purging chute that slidably supports the other end of the movable chute 30, one end of which is supported by the air cylinder 31, and receives the purge resin sliding down through the movable chute 30, so that the purge resin is removed from the airframe. It is discharged to Third about the movable chute 30
To explain in detail with reference to the drawings and FIG. 4, the side wall members 34 and the bottom plate member 35 have a double structure with a hollow interior and are watertight. The hollow part inside is divided into a plurality of chambers by a plurality of dividing plates, and each chamber is divided by cooling water etc. introduced from the liquid supply port 36 as shown in the exploded view of FIG. The purge resin rotates in sequence and is discharged from the drain port 37 to cool the purge resin falling onto the movable chute 30. Similarly, as shown in FIG. 5, the purging chute 32 has a watertight double structure with side wall members 38 and 39 and a bottom plate 40 having a plurality of chambers divided by a plurality of dividing plates. A cooling liquid such as water flows through each chamber in turn from the liquid supply port 41 to the liquid discharge port 42 to cool the purging chute 32.

<Effects of the Invention> According to the present invention, the movable chute and the purging chute that receive the purge resin and discharge it to the outside of the aircraft are cooled, so that the purge resin does not adhere to them.

[Brief explanation of the drawing]

1 and 2 are diagrams showing one embodiment of the present invention, and FIG. 1 is a diagram when the purging operation is not performed. FIG. 2 is a diagram during purging operation. Figure 3 is a detailed view of the movable chute, and Figure 3 is a plan view. B is a front view. C is a cross-sectional view. FIG. 4 is an exploded view of the movable chute to explain the flow of cooling water. Figure 5 is a detailed view of the purging chute, with A being a plan view, B being a front view, and C being a side view. Figures 6 and 7 are diagrams of the conventional method;
Figure 6 is a plan view. Figure 7 is a front view. 30...Movable chute, 31...Air cylinder, 32...Pursing chute, 33, 34,
38, 39... Side wall member, 35, 40... Bottom plate member.

Claims (1)

[Scope of utility model registration request] During the purging operation, the tip of the nozzle is blocked by using air or a hydraulic cylinder to cross the extension line of the nozzle, and in the purge chute, which receives the purge material pushed out from the nozzle at the lower part, the chute member is made into a hollow shape, and the purge member is made into a hollow shape. A purging chute characterized in that a passage for a cooling medium is provided in the chute.