JPH069823Y2 - Purging material discharge device of injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a purging device for receiving a material that has been purged (empty) for color change and material change in an injection molding machine.

[Prior Art] Generally, when performing color change or material change with an injection molding machine, the material supplied to the injection device is changed, and purging is performed to discharge the material remaining in the injection device. Should be replaced.

This purging is performed in a state where the nozzle is separated from the mold, but if the molten resin that has been purged from the nozzle adheres to the mold or the die plate, it is difficult to remove it, and the nozzle position is above the die plate. With a vertical injection molding machine, it takes time other than removal, which often results in a large loss of molding work time.

[Problems to be solved by the device]

As a means for solving such a problem, it is necessary to provide a shield plate between the die plate and the nozzle so that the shield plate can advance and retreat to prevent the material purged by the shield plate from adhering to the die plate or the mold. 58-39057.

However, in this prior art, the high temperature material after purging is dropped on the machine base of the molding machine, and even if it is received by the tray, it takes manpower to discharge it to the outside of the machine base. This molten material that has just been purged is dangerous at high temperatures, and therefore, conventionally, the material stored in the heap was cooled and solidified, then removed with a scratching rod, etc., and discharged outside the machine stand. . Further, since this work is performed immediately before or near the injection cylinder heated to a high temperature, there is a problem in terms of safety, and some improvement is desired.

This invention is conceived in response to the above-mentioned demand, and the purpose thereof is to prevent the adhesion of the material to the die plate side and to mechanically remove the molten material outside the machine base immediately after the completion of purging. It is to provide a new purging material discharging device.

[Means for Solving the Problems]

According to the features of the present invention for the above-mentioned purpose, a shooter having a length reaching the outside of the machine is provided on the machine base between the die plate and the nozzle of the injection molding machine, and the tip of the nozzle is provided inside the scraping plate facing the nozzle. A scraping member with a cutter that slides to remove adhering material and whose position can be adjusted is attached to a piston rod of a cylinder device that is horizontally supported by a pedestal provided on the side of the die plate, and is attached onto the shooter. There is a reciprocating movement.

[Action]

In the above purging material discharging device, after moving the injection device backward to separate the nozzle from the mold, the scraping member is moved forward to be positioned on the opposite side of the nozzle, and then purging the material from the nozzle, The molten material is purged on the shooter in front of the scraping member.

When the scraping member is moved backward after purging, the scraping member returns so as to slide the nozzle tip from the side, scrapes off the material hanging from the nozzle tip, and scrapes the material on the shooter out of the machine stand.

〔Example〕

In the figure, 1 is a die plate of a horizontal injection molding machine, which is installed on a machine base 3 together with an injection device 2 having a normal structure. The injection device 2 is provided so as to come into contact with and separate from the die plate 1 having a nozzle insertion hole 4 in the central portion.

A purging material discharging device 5 reciprocates between the shooter 7 provided on the machine base between the die plate 1 and the nozzle 6 of the injection device 2 in the retracted position, and the scraping member 8 and the scraping member 8 on the shooter. It consists of a moving cylinder device 9.

The shooter 7 has a length reaching from the center of the machine base to the outside of the machine base, and is bent downward so that the material can be easily discharged from the middle, and the lower end of the shooter 7 is close to the upper surface of the shooter in a horizontal portion.
The scraping member 8 reciprocates on the shooter.

The scraping member 8 has a scraping plate 8a and a connecting plate 8b juxtaposed at the front and rear ends of a shielding plate 8c located on the front surface of the nozzle insertion hole 4 to open the two surfaces on the nozzle side and the lower side. Further, the nozzle 6 of the scraping plate 8a is made of a box-shaped body that is rigidly formed by providing a top plate.
A cutter 10 is attached to the inside of the side end facing the nozzle with a concave portion that matches the nozzle surface.

Further, the piston rod 11 and the guide rod 12 of the cylinder device 9 are connected to the connecting plate 8b. The guide rod 12 and the cylinder device 9 correspond to the die plate 1 described above.
The cylinder device 9 is horizontally supported by a pedestal 13 attached to the side of the cylinder device 9, but the guide rod 12 is movably inserted therein.

The surfaces of the shooter 7 and the scraping member 8 are subjected to anti-adhesion treatment such as Tefloc coating, and the cutter 10
Is bolted so that the position with the tip of the nozzle 6 can be adjusted.

Next, the operation will be described.

First, according to the retracted position of the injection device 2, the cutter 10
Adjust the amount of protrusion so that the nozzle tip slides on the nozzle tip.

Next, when the molding of the specific material is completed, the injection device 2 is moved backward to a predetermined position for purging, and the material supplied to the injection device 2 is switched to a new material. On the purging device 5 side, the cylinder device 9 is moved forward by air pressure or hydraulic pressure, and the piston rod 11 is extended to move the scraping member 8 forward from the retracted position of the chain line shown in FIG. The lapping plate 8a is located on the opposite side of the nozzle 6.

When such preparation is completed, purging is started. The purged material is ejected from the nozzle 6 in a molten state, but since the shielding plate 8c is located in front of the nozzle, it does not enter the nozzle insertion hole 4 and falls onto the shooter inside the scraping plate 8a. When purging is completed, the cylinder device 9 is moved backward to move the scraping member 8 backward to the original position indicated by the chain line.

Along with the backward movement of the scraping member 8, the cutter 10 first scrapes the molten material adhering to the nozzle 6 by sliding the nozzle tip, and then the scraping plate 8a collects the purging material accumulated on the flat part of the shooter 7. Scrape off. The purging material carried on the shooter along with the scraping member 8 to the side of the machine slides down to the outside of the machine due to the inclined portion of the shooter, and is stored in a box placed at the shooter drop end outside the machine. The scraping member 8 is prepared for the next purging.

The purging operation can be performed manually by an operator or automatically by a sequence program of a microcomputer.

Further, although the cutter 10 is attached to the scraping member 8 in the above-described embodiment, it may be formed so that the tip edge of the scraping member 8 can be slidably contacted with the tip of the nozzle. Further, when a nozzle touch plate having small holes is provided between the front surface of the scraping member and the nozzle, the back pressure at the time of measurement can be increased and the color can be changed efficiently.

Further, although the above-mentioned embodiment is intended for a horizontal injection molding machine, it can be applied to a vertical injection molding machine by slightly changing the shape of the scraping member, so that the present invention is particularly limited to a horizontal injection molding machine. is not.

[Effect of device]

As described above, the invention is based on the die plate 1 of the injection molding machine.
A shooter 7 having a length reaching the outside of the machine is provided on the machine base between the nozzle 6 and the nozzle 6, and a cutter 10 for slidingly contacting the tip of the nozzle and removing the adhering material is provided inside the scraping plate 8a facing the nozzle 6. The scraping member 8 whose position is adjustable is attached to the piston rod 11 of the cylinder device 9 which is horizontally supported by the pedestal 13 provided on the side portion of the die plate 1 so that the scraping member 8 can reciprocate on the shooter 7. Since it is provided, both the scraping and the scraping of the purging material can be performed without manpower by the backward movement of the scraping member, and the purging work can be safely performed.

Therefore, it is not necessary to wait for the purging material to be cooled and solidified, and the steps from the start of the purging step to the start of the next molding can be automated to save the labor required for purging.

Further, since the cutter 10 is provided on the inside of the scraping plate 8a so that the position thereof can be freely adjusted, there is no possibility that the scraping remains due to the displacement, and the nozzle tip and the die are prevented from being damaged by the nozzle adhering material. As a result, there are advantages that the steps from the start of the purging step to the start of the next molding can be automated, the time required for color change can be shortened, and the molding efficiency can be increased.

[Brief description of drawings]

The drawings show an embodiment of a purging material discharging device of an injection molding machine according to the present invention. Fig. 1 is a perspective view, Fig. 2 is a partial cross-sectional plan view of a main portion, and Fig. 3 is a tie plate. It is a front view with a nozzle. 1 ... Die plate, 2 ... Injection device 3 ... Machine stand 5 ... Purging material discharge device 6 ... Nozzle, 7 ... Shooter 8 ... Scraping member 8a ... Scraping plate, 8b ... Connecting plate 8c ... shield plate, 9 ... cylinder device 10 ... cutter 11 ... piston rod

Claims (1)

[Scope of utility model registration request] 1. A shooter having a length reaching the outside of the machine is provided on a machine table between a die plate of an injection molding machine and a nozzle, and the shooter plate is attached by sliding contact with the tip of the nozzle on the inside facing the nozzle. A scraping member with a positionally adjustable cutter for removing material is attached to a piston rod of a cylinder device that is horizontally supported on a pedestal provided on the side of the die plate, and is reciprocally movable on the shooter. The purging material discharge device of the injection molding machine provided.