JP2000254940A - Purging and measuring device for upright injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an operation to replace a purging tray and a measuring plate and perform the purging and measuring process to shorten time required for molding arrangements by installing the purging tray on an upper platen in such a way that the purging tray gyrates between a purging operation position and a molding operation position. SOLUTION: A purging tray 23 is integrally formed with a measuring plate 22 and is mounted, in a freely gyrating manner, on the upper platen 1 of an upright injection molding machine, centered around a shoulder bolt 24. A measuring plate 22 is precisely set to ensure its appropriate position during measuring by introducing a pin 25 into an introduction hole 25a and an introduction hole 25b on the upper face of the upper platen 1. The purging tray 23 is gyrated to a purging position to perform the purging process and the measuring plate 22 is positioned at a spot for measuring operation to measure a molding material through touching a nozzle, and is set at a molding position to initiate the molding operation. During molding, the purging tray 23 is moved to the fore to discharge the purged mass after the start of the molding operation. Thus it is possible to change the position only by gyration to perform the operation and facilitate the preparatory work to cut time for preparations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection molding machine for purging (in order to remove a plastic melt molding material remaining in a heating cylinder or a screw groove, another plastic material is supplied to perform an injection or extrusion operation. And the replacement of the plastic material during operation of the molding machine, or when changing the color), and a weighing device.

[0002]

2. Description of the Related Art Referring to FIG. FIG. 6 shows a purging apparatus in a known vertical injection molding apparatus, and purging is performed in the following procedure. 1) The purge tray 19 is placed on the upper platen 1 for purging. At this time, guides 2 are provided on both sides of purge tray 19.
0, until it hits the stopper 20 '. 2) Hold both sides of the purge tray 19 with the handle 19a.
Remove along 0,20 and discharge purged lump. 3) Insert another weighing plate 19 'along the guide 20 until it hits the stopper 20', position it on the upper platen 1, and perform weighing by touching the nozzle. 4) After the measuring plate 19 'is removed along the guide 20, molding is started.

[0003]

However, the purging and measuring device of the conventional vertical injection molding machine places the purge tray 19 and the measuring plate 19 'on the upper platen 1 every time the purging and measuring steps are repeated. It had to be placed and was troublesome. In addition, since it is necessary to insert the purge tray 19 and the weighing plate 19 'along the both-side guides 20, and only to insert those members along the both-side guides 20, accurate positioning cannot be performed. .
The purging and weighing device according to the present invention comprises a purge pan 19 and a weighing plate 1 as in the prior art described above.
An object of the present invention is to reduce the setup time for molding by performing purging and weighing without exchanging with 9 '.

[0004]

In a vertical injection molding machine, a purge tray is mounted on an upper platen so as to be pivotable between a purging operation position and a molding operation position. In a vertical injection molding machine, a purge tray and a measuring plate are integrally connected to each other, and a pivoting operation between a purging operation position by the purge tray and a measuring operation position by the measuring plate is made possible on the upper platen. In a vertical injection molding machine, a measuring plate positioning mechanism was provided to enable positioning of the measuring plate when the nozzle was touched. The positioning mechanism includes a pin insertion hole 25a provided on the weighing plate side, a pin insertion hole 25b provided on the upper platen side, and a pin 25 inserted into these holes.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the present invention, an example of a vertical injection device to which the present invention is applied will be described with reference to FIG. In FIG. 5, (a) shows when the mold is opened, and (b) shows when the mold is fully closed. In the figure, 1 is an upper platen, and 3 is a lower platen. Reference numeral 4 denotes a toggle mechanism, which comprises an upper link 4a and a lower link 4b. The upper link 4a is pin-connected to the lower platen 3 at its upper part, and the lower link 4b is pin-connected to the toggle support 5 at its lower end. . The upper link 4a and the lower link 4b are joined by a pin 4c at an intermediate portion so as to be bendable.

[0006] The lower platen 3 is supported at its periphery by a frame 10. The upper platen 1 and the toggle support 5 are fixed above and below a tie bar 2 penetrating the lower platen 3. The cross head 6 is pin-connected to the lower link 4b, 4b forming a pair of left and right constituting the toggle mechanism 4 via a short link 6a pin-connected to an intermediate portion thereof. A ball screw shaft 8 is attached to the intermediate position of the crosshead 6 by a bearing 9. The ball screw shaft 8 is screwed with a ball nut 7 supported by a toggle support 5, and the lower end thereof is spline-coupled to a pulley 13 installed on a support 12 fixedly mounted on a base 11 so as to be able to slide up and down. Have been.

Reference numeral 14 denotes a servomotor supported by the frame 10, which drives the pulley 13 provided with a spline therein through a belt 16 wound around a pulley 15 driven by the servomotor. 17 is an injection device, and 18 is a nozzle unit.

The present invention is to be mounted on the upper platen 1 in such a vertical injection molding apparatus. Hereinafter, the purging and measuring device of the present invention will be described with reference to FIG. FIG. 1 is a plan view of the upper platen 1. FIG. 1 (a)
Numeral 1 denotes an upper platen of a vertical injection molding machine, and numeral 22 denotes a measuring plate, which is rotatably mounted on the upper platen 1 via a shoulder bolt 24. 23 is a purge tray. In the illustrated example, the purge tray 23 is integrally connected to the measuring plate 22. The weighing plate 22 and the purge tray 23 are on the upper platen 1 and can be pivoted around the shoulder bolt 24 as shown by an arrow a.

The measuring plate 22 is provided with an insertion hole 25a for inserting the pin 25 so that the position at the time of measurement can be easily determined. The insertion hole 25a and the insertion hole 25b provided on the upper surface of the upper platen 21 are provided with pins. 25 is inserted so that the position at the time of weighing can be correctly determined. Reference numeral 26 denotes a handle of the purge tray 23.

FIGS. 2A and 2B are detailed views of the purge tray 23 and the upper platen 1 for mounting the purge tray 23, wherein FIG. 2A is a plan view and FIG.
It is the A arrow view of (a). The purge tray 23 has a pentagonal shape in a plan view (FIG. 3), and has a vertically bent piece 23a on one side, and a pipe handle 26 attached to the opposite side of the vertically bent piece 23a. 23b is a pair of holes provided in the vertical bent piece 23a, and is connected to the measuring plate 22 with bolts or the like via the holes 23b.

FIG. 4 is a detailed view of the measuring plate 22.
The measuring plate 22 is an elongated plate having four chamfered corners. The measuring plate 22 is provided with a spherical concave portion 22a at the middle portion of which the nozzle tip contacts (nozzle touch) and a through hole 22b through which the shoulder bolt 24 passes. A pin hole 22 is provided at one corner.
c is provided. Reference numeral 22d denotes a hole which is connected to a pair of holes 23b provided in the vertically bent piece 23a of the purge tray 23 by bolts 22e or the like.

FIG. 2 is an assembly view of the above-described purge tray 23 and measuring plate 22 on the upper platen 1. In the figure, the purge tray 23 and the weighing plate 22 are integrated. That is, the two are vertically bent pieces 23 of the purge tray 23.
A bolt 22e (FIG. 2 (b)) is inserted into and coupled to a pair of holes 23c provided in a and a hole 22d provided in the measuring plate 22.

In FIG. 2, the position PP is a purging operation position. In this position, the center of the purge tray 23 is at the nozzle center position O. The position of the symbol MP is a weighing operation position. In this position, the center of the nozzle coincides with the spherical concave portion 22a of the measuring plate 22. The position can be changed from the position PP to the position MP by pivoting around the shoulder bolt 24.

When the robot is further turned to the position indicated by the symbol CP, this position is the position for the cleaning operation, and the purge lump collected on the purge tray 23 can be discharged to another container or the like.

At the MP position, that is, the weighing position, the pin 25 is connected to the hole 2 of the weighing plate 22 in order to ensure its accuracy.
2c is inserted into a pin hole 25a provided in the upper platen 1 and positioned.

(Operation) The purging and weighing procedure using the present invention is as follows. (1) The purging tray 23 is turned to the purging position in FIG. 1A to perform purging. (2) The measuring plate 22 is turned around the shoulder bolt 24 (FIG. 1 (b)), positioned at the measuring operation position, and the nozzle is touched to the measuring plate 22 to perform measurement. (3) The measuring plate 22 is turned to the molding position (FIG. 1C) to start molding. (4) During the molding, the purge tray 23 comes to the front as shown in FIG. 1C, so that the purge lump can be discharged after the molding is started. In the above description, the measuring plate 22 and the purge pan 23
Although the description has been made of the case where the measuring plate is not required, a structure in which only the purge tray 23 can be turned around the shoulder bolt 24 may be adopted.

[0017]

(1) Since the purge tray is pivotally mounted on the upper platen, there is no need to pull out or push in with the handle as in the conventional case, and the operation is simplified. (2) In addition, since the purge receiving plate and the measuring plate are integrated and both can be rotated on the upper platen, it is possible to immediately change positions to only respective positions during purging and measuring, thereby facilitating the setup operation. . (3) A pin can be inserted between the weighing plate and the upper platen for easy positioning, which greatly contributes to facilitating the setup work due to the revolvable structure and dust.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the configuration of the present invention and each operation position.

FIGS. 2A and 2B are detailed views showing the relationship between a purge tray, a measuring plate, and an upper platen, wherein FIG. 2A is a plan view and FIG.
Arrow view.

FIG. 3 is a detailed view of a purge tray, (a) is a plan view, and (b) is
FIG.

FIG. 4 is a detailed view of a measuring plate, where (a) is a plan view and (b)
3A is a partial cross-sectional view of FIG.

FIG. 5 is a sectional view showing an example of a vertical injection molding machine;
(a) shows when the mold is opened, and (b) shows when the mold is closed.

FIG. 6 is a plan view showing a known purge tray.

[Explanation of symbols]

 1 Upper platen 22 Measuring plate 22a Spherical recess 22b Through hole 22c Pin insertion hole 22d hole 22e bolt 23 Purge tray 23a Vertically bent piece 23b hole 24 Shoulder bolt 25 pin 25a hole 25b hole 26 Handle

Claims (4)

[Claims] 1. A purging apparatus for a vertical injection molding machine, wherein a purge tray is pivotably mounted between a purging operation position and a molding operation position on an upper platen in a vertical injection molding machine. . 2. In a vertical injection molding machine, a purge tray and a weighing plate are integrally connected to each other, and a pivoting position between a purging operation position by the purge tray and a weighing operation position by the weighing plate is enabled on the upper platen. Purging and weighing device for a vertical injection molding machine. 3. The purging and weighing of a vertical injection molding machine according to claim 2, wherein a positioning mechanism of the weighing plate is provided in the vertical injection molding machine so that the weighing plate can be positioned when the nozzle is touched. apparatus. 4. The positioning mechanism comprises a pin insertion hole (25a) provided on the measuring plate side, a pin insertion hole (25b) provided on the upper platen side, and a pin (25) inserted into these holes. 4. A purging and measuring device for a vertical injection molding machine according to claim 3, wherein: