JPH0611148Y2 - Purging device for 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. Must be replaced with material.

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

[Problems to be solved by the invention] As a means for solving such a problem, a shield plate is provided between the die plate and the nozzle so as to be able to move forward and backward, and the material purged by the shield plate adheres to the die plate and the mold. Although Japanese Patent Publication No. 58-39057 discloses a method of preventing the above phenomenon, no consideration is given to the removal of the material remaining on the tip of the nozzle at the end of purging.
The material adhering to the tip of the nozzle causes stringing after the start of molding, which causes clogging of the gate of the mold and deformation of the nozzle touch part.After purging, the operator manually removes it. is doing. This work is extremely dangerous because it is performed with the nozzle in a heated state, and some improvement is desired.

The present invention was conceived in response to the above-mentioned demand, and its purpose is to prevent the material from adhering to the die plate side and to newly scrape the material adhering to the nozzle tip after the purging is completed. The present invention is to provide a purging saucer device.

[Means for Solving the Problems] The features of the present invention according to the above-mentioned object are that a saucer provided between a die plate of an injection molding machine and a nozzle so as to be able to move forward and backward, and a slide contact with a tip of the nozzle when the saucer moves backward are attached. It consists of a cutter for removing material, and the cutter is attached to the tip of the tray so as to be positionally adjustable so as to project inward and horizontally upward.

[Operation] In the purging receiving device, the injection device is moved backward to separate the nozzle from the mold, and then the purging receiving device is moved forward between the die plate and the nozzle to be inserted, and receives the purged material from the nozzle. When the saucer is moved backward after purging, the cutter attached to the tip of the saucer comes into sliding contact with the tip of the nozzle, whereby the material hanging down on the tip of the nozzle is scraped off and the material falls on the saucer.

[Embodiment] In the drawing, reference numeral 1 is a die plate located at the upper part of a vertical injection molding machine, on which an injection device 2 having a normal structure can be raised and lowered by a pair of shift cylinders 3 and 3 with a nozzle 4 facing downward. It is installed in.

At the center of the die plate 1, the insertion hole 5 for the nozzle 4 is provided.
And a purging device 6 is attached to the side.

The purging device 6 includes a support base 7 fixed to the side surface of the die plate, a cylinder 8 laterally attached to the center of the support base, and guide rods 9 and 9 inserted through pedestals on both sides of the cylinder, and the guide rods 9 and 9 and the cylinder. 8 piston rod 10
And a tray 12 which is connected to both of them via a member 11 and horizontally moves on the upper surface of the die plate 1 by a cylinder 8.

The surface of the tray 12 is subjected to an anti-adhesion treatment such as Teflon coating, and a cutter 13 is attached to the tip horizontally and inwardly so as to project above the side edge. Although not shown in the drawing, the cutter 13 is bolted so that the height position can be adjusted so as to be in sliding contact with the tip of the nozzle 4 in the raised (retracted) position.

Next, the operation will be described.

First, the height position of the cutter 13 is set in advance at a position where the tip of the nozzle is in sliding contact. When the molding of the specific material is completed, switch the material supplied to the injection device 2 to a new material,
The shift cylinders 3, 3 are extended to raise the injection device 2 to a predetermined purging position.

Next, as shown in FIG. 2, the tray 12 moved to the retracted position (chain line) on the side of the injection device 2 is moved between the die plate 1 and the nozzle 4 by the extension operation of the cylinder 8. To do. Purging is performed after stopping the tray 12 at the position shown by the solid line, and the purged material is stored in the tray 12.

When the purging is completed, the tray 12 is moved back to the original position by the reduction operation of the cylinder 8. By this movement, the cutter 13 slidably contacts the tip of the nozzle from the cutting edge side, scrapes off the material adhering to the tip of the nozzle, and drops it on the tray 12. The material contained in the pan 12 is taken out in the retracted position, and the pan 12 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 above embodiment is directed to the vertical injection molding machine, it can be applied to the horizontal injection molding machine by slightly changing the shape of the tray, so that the present invention is not limited to the vertical mold. Absent.

[Effect of the Invention] As described above, the present invention has a saucer in which the purging receiver is provided between the die plate and the nozzle of the injection molding machine so as to be able to move forward and backward, and the tip of the saucer can be inwardly and positionally adjusted. It consists of a mounting cutter that projects horizontally upward, and the cutter slidably contacts the nozzle tip when the tray is retracted to remove the adhering material.Therefore, purging the saucer and adhering material at the nozzle tip by the cutter It is possible to prevent the adhesion of the purging material to the mold and the die plate and to prevent the damage of the mold and the tip of the nozzle due to the adhesion material.

Also, since a cutter is used to remove the adhering material at the tip of the nozzle, even if the adhering material slightly hardens, it can be cut from the nozzle end surface and stored in the pan, and the position of the cutter can be adjusted, The removal of the material is always reliable, and the adhering material can be removed by retreating the receiving tray after the receiving of the purge material by the receiving tray, so the process from the start of purging to the start of the next molding is automated and the number of steps required for purging. Can be omitted.

Furthermore, since the cutter is attached to the tip of the tray to form the device, the structure is extremely simple, the cost is not high, and the handling is easy.

[Brief description of drawings]

The drawings show one embodiment of a purging receiving device of an injection molding machine according to the present invention. FIG. 1 is a perspective view and FIG. 2 is an explanatory view of a main part. 1 ... Die plate, 2 ... Injection device 4 ... Nozzle 6 ... Purging receiving device, 8 ... Cylinder 9 ... Guide rod 10 ... Piston rod, 11 ... Member 12 ... Receiving plate, 13 ... Cutter

Claims (1)

[Scope of utility model registration request] 1. A receiving plate provided between a die plate of an injection molding machine and a nozzle so as to be able to move forward and backward, and a cutter for slidingly contacting the tip of the nozzle to remove the adhering material when the receiving plate moves backward,
A purging receiving device for an injection molding machine, characterized in that the cutter is attached to the tip of the tray so as to be positionally adjustable so as to project inward and horizontally upward.