JP2002160264A - Injection nozzle unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an injection nozzle unit of an injection molding machine capable of performing the molding changeover of two kinds or two or more kinds of resins. SOLUTION: The injection nozzle unit 1 is equipped with resin injection ports 4a and 4b injecting molten resins from the outside and provided at two places or two or more places, resin flow channels 7a and 7b for allowing the molten resins from the resin injection ports 4a and 4b provided at two places or two or more places to meet with each other, a nozzle 5 for injecting the resins in a mold from the flow channels after confluence and at least two resin back flow preventing mechanisms 6 provided between the resin injection ports 4a and 4b provided at two places or two or more places and the confluent point of the flow channels. The resin injection ports 4a and 4b provided at two places or two or more places are constituted as nozzle pressing surfaces 2a and 2b capable of being pressed by the nozzles of independent injection units 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection nozzle unit of an injection molding machine capable of performing molding of a plastic injection molding machine with multiple colors and many materials without wasting time.

[0002]

2. Description of the Related Art In the case of performing molding by switching a plurality of resins or colors of resins and molding with a conventional standard injection molding machine, an old resin in a plasticizing apparatus is discharged and switched to a new resin. A resin change operation is required. However, during this resin change operation, not only is production time wasted, but also the resin used during resin change and color change is wasted as waste.

[0003] Therefore, as a system for eliminating such waste, a barrel exchanging apparatus which exchanges a plurality of barrels for use has been proposed. However, this device not only increases the equipment cost, but also allows a replacement device from the required space to two resins, but if the number of resins exceeds that,
There is a problem that it is difficult to configure the device.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. Therefore, an object of the present invention is to simultaneously press the nozzles of two or two or more injection units in order to switch the molding of two or more types of resin without wasting time.
An object of the present invention is to provide an injection nozzle unit that can be molded with a molten resin supplied from an injection unit pressed on a nozzle pressing surface, using an injection nozzle unit having two or more nozzle pressing surfaces. It is.

[0005]

According to the present invention, there is provided an injection nozzle unit comprising two or more resin injection ports for injecting a molten resin from outside, and the two or more resin injection ports. And a nozzle for injecting the molten resin from the flow path after the merging into the mold, and from the two or more resin inlets to the junction of the flow path. And two or more resin backflow prevention mechanisms provided between them, and the two or two or more resin injection ports serve as nozzle pressing surfaces that can be simultaneously pressed by nozzles of independent injection units, respectively. As a result, the resin changing operation of molding can be realized without wasting time.

Further, another injection nozzle unit of the present invention comprises two or more resin injection ports for injecting molten resin from the outside, and a molten resin from the two or more resin injection ports. A resin flow path for joining the resin, a switching valve provided at the junction of the molten resin to switch the molten resin from the two or more resin inlets, A nozzle for injecting the resin into the mold, wherein the two or more resin injection ports are configured as nozzle pressing surfaces that can be simultaneously pressed by the nozzles of the independent injection unit, and the resin changing operation of molding is a waste time. Can be realized without.

Further, each of the above-mentioned injection nozzle units is provided with a mechanism for pressing and separating from the mold to be molded, and the injection nozzle unit moves in conjunction with the pressing and separating operations of the injection unit. The nozzle of the injection nozzle unit is configured to be pressed and separated from the mold.

[0008]

FIG. 1 shows an injection nozzle unit having two resin injection ports according to an embodiment of the present invention.

Reference numeral 1 denotes an injection nozzle unit, and a support frame 12 mounted on a fixed die plate 11 and a guide 1 integrally mounted on the support frame 12.
3, and an injection nozzle unit main body 14 provided at the center of the guide 13 so as to be movable left and right in FIG. Reference numerals 2a and 2b denote nozzle pressing surfaces formed in the injection nozzle unit main body 14, which are configured to be able to simultaneously press the nozzles of the injection units 3a and 3b, and to the injection units 4a and 4b for injecting the molten resin. 3a,
The molten resin injected from the nozzle 3b can be injected. 5 is a nozzle attached to the injection nozzle unit body 14 for injecting the molten resin into the mold,
Reference numeral 6 denotes a direction switching valve, which has two molten resin injection ports 4a,
The configuration is such that the flow paths 7a and 7b of the molten resin injected from 4b are switched to switch the resin sent to the nozzle 5.

Reference numeral 8 denotes a cylinder for moving the injection nozzle unit main body 14 back and forth according to the left and right movement of the injection units 3a and 3b in FIG. 1, and pressing and separating the nozzle 5 of the injection nozzle unit main body from the mold. It is.

FIG. 2 shows an injection nozzle unit according to another embodiment of the present invention in which two resin injection ports are provided. In place of the direction switching valve 6 in the embodiment of FIG. The check valves 9a and 9b are inserted into the flow paths 7a and 7b, respectively.

Next, the operation of the present invention will be described. FIG. 1A shows a case where molding is performed using the injection unit 3a side, and the switching valve 6 is switched so as to supply the molten resin in the flow path 7a to the nozzle 5. In this state, the molding operation is performed by the normal control operation of the injection molding machine (not shown) using the injection unit 3a side.

At this time, when the current resin is used for the next molding as it is, the other injection unit 3b may be controlled so as to start a normal preliminary temperature increase at the start of the next molding. If the next molding is performed so as to use the third resin, the purging operation for changing the resin can be performed during the molding on the injection unit 3a side.

In the case of a system in which a separate barrel is provided for each resin to be used, the barrel can be replaced while the injection unit 3a is being molded.

When the switching valve 6 is switched as shown in FIG. 1B when the molding using the injection unit 3a is completed, the switching is performed so that the molten resin in the flow path 7b is supplied to the nozzle 5. Molding using the unit 3b side becomes possible.

When the injection nozzle unit shown in FIG. 2 is used, there is no need to switch the resin flow path with the switching valve as described above, and when molding is performed using the injection unit 3a side, the injection unit 3a side is used. Injection pressure, check valve 9
b automatically closes the injection unit 3b side, and conversely, when molding is performed using the injection unit 3b side, the check valve 9a automatically closes the injection unit 3a side at the injection pressure of the injection unit side. When the injection unit used for molding is pressed against the nozzle pressing surface on the side to be used and the molten resin is supplied, the operation can be performed so that the resin to be used can be automatically switched.

[0017]

According to the present invention, an injection nozzle unit capable of simultaneously pressing two or more injection units is used, and the molten resin supplied from two or more injection units inside the injection nozzle unit is used. By switching and molding, molding that requires resin change can be performed without loss of time. Also, when switching to the third resin, the resin can be changed by the other injection unit while the molding is being performed by one injection unit, so that the molding can be continued without causing wasted time in the molding machine.

In the case of a system in which an injection unit is provided for each type of resin, while one of the injection units is being molded,
Since the other injection unit can be exchanged, there is no waste of the molding machine and no waste resin.
Molding can be continued.

[Brief description of the drawings]

FIG. 1 is a diagram showing an injection nozzle unit having two resin injection ports according to an embodiment of the present invention.

FIG. 2 is a view showing an injection nozzle unit having two resin injection ports in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection nozzle unit 2a, 2b Nozzle pressing surface 3a, 3b Injection unit 4a, 4b Molten resin injection port 5 Nozzle of injection nozzle unit body 6 Direction switching valve 7a, 7b Molten resin flow path 8 Cylinder 9a, 9b Backflow prevention Valve 11 Fixed die plate 12 Support frame 13 Guide 14 Injection nozzle unit body

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[Procedure amendment]

[Submission date] December 7, 2000 (200.12.
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (3)

[Claims] 1. A resin flow path for injecting molten resin from outside at two or two or more resin injection ports, a resin flow path for merging the molten resin from the two or two or more resin injection ports, A nozzle for injecting the molten resin from the subsequent flow channel into the mold, and two or two or more nozzles respectively provided between the two or two or more resin injection ports and the junction of the flow channels An injection nozzle unit, comprising: a resin backflow prevention mechanism, wherein the two or more resin injection ports are configured as nozzle pressing surfaces capable of simultaneously pressing nozzles of independent injection units, respectively. . 2. A resin injection port for injecting molten resin from the outside at two or two or more locations; a resin flow path for joining the molten resin from the two or two or more resin injection ports; Provided at the junction of the molten resin, a switching valve for switching the molten resin from the two or two or more resin inlets, and a nozzle for injecting the molten resin from the flow path after the joining into the mold. The injection nozzle unit, wherein the two or more resin injection ports are configured as nozzle pressing surfaces that nozzles of independent injection units can simultaneously press. 3. The injection nozzle unit according to claim 1, wherein the injection nozzle unit is provided with a mechanism that presses and separates the die from a mold to be molded.