JPS6323892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for changing materials in an injection molding machine, and includes an injection unit 1 for injecting material, an injection mold 3 for molding resin injected from the injection unit 1. In a vertical injection molding machine in which the injection unit 1 is arranged vertically facing each other so that it is positioned above the injection mold 3, the injection unit 1 is placed on a pedestal 21 arranged above the injection mold 3.
A guide hole 23 is provided to guide the nozzle 22 and make the nozzle 22 correspond to the injection mold 3.
A plurality of injection units 1 are mounted on a base 2 rotatably arranged on the base 1 so as to be positioned on the circumference around the rotation axis of the base 2, and the appropriate injection units 1
This invention relates to a material changing device for an injection molding machine, characterized in that it is provided with locking means for locking the base 2 when the nozzle 22 and the guide hole 23 match.

Conventionally, vertical injection molding machines have one injection unit that injects the resin, so the molding machine has to be stopped when changing materials such as changing colors, materials, and combinations, which takes a lot of time to set up. There was a drawback.

The present invention has been made in view of the above points, and the object of the present invention is to use a plurality of injection units so that even if the machine is a vertical injection molding machine, the injection units on standby can be colored. To provide a material changing device for an injection molding machine that can almost complete preparations for material changing such as changing, changing materials, and changing compounding, thereby reducing loss time.

The present invention will be explained in detail below with reference to Examples. 4 is a utensil stand, and a support 5 is erected in the center. Pillar 5
An upper rotary disk 6 and a lower rotary disk 7 are installed above and below, and between the upper rotary disk 6 and the lower rotary disk 7, a plurality of injection molds (three in the case of this embodiment) are installed. 3 is placed. This injection mold 3 has a fixed side mounting plate 8
, a tie rod 9 attached between the fixed side mounting plate 8 and the lower rotary disk 7, a movable side mounting plate 10 slidably attached to the tie rod 9, and a fixed side template attached to the fixed side mounting plate 8. 11, and a movable template plate 12 attached to the movable mounting plate 10.
A socket 13 is provided on the fixed side mounting plate 8, and the socket 13 communicates with the cavity via a locate ring 14, a sprue, and a runner. Lower turntable 7
A movable rod 15 is slidably inserted through the movable rod 15, the upper end of the movable rod 15 is connected to the movable side mounting plate 10, and a wheel portion 16 is attached to the lower end of the movable rod 15. Further, the device stand 4 is provided with a mold clamping cylinder 17 and a mold opening cylinder 18, and a wheel storage recess 19 is provided above the mold opening cylinder 18. The upper rotary disk 6 and the lower rotary disk 7 are rotatably driven by rotation driving means. Further, a pedestal 21 is installed between the upper end of the column 5 and the auxiliary column 20 on the side of the column 5, and this pedestal 21 is provided with a guide hole 23 for guiding the nozzle 22 of the injection unit 1. . A fan-shaped base 2 is placed on this pedestal 21, and the apex of the base 2 is rotatably attached to a support 5. A plurality of injection units 1 for injecting resin are arranged on this base 2, and the injection units 1 are mounted so as to be vertically movable by a sliding rod 24, and the injection units 1 are moved by a vertical driving cylinder 25. It can be driven up and down. The base 2 has an arc-shaped elongated hole 26, and lock holes 27 are formed at both ends of the elongated hole 26. A lock cylinder 28 is attached to the pedestal 21, and the lock cylinder 28 can drive a T-shaped lock pin 29 up and down, and locking protrusions 30 that can hang down from both sides of the lock pin 29 are provided. It can be freely engaged with and detached from the lock hole 27. Further, a guide bush 32 is suspended from the base 2, and a rod 33a is attached to an interlocking cylinder 33 attached to the upper rotary disk 6 so as to be able to move in and out of the guide bush 32. Furthermore, 34 is a guide plate for blanking material.

Next, the operation of the apparatus of the present invention constructed as described above will be explained. The nozzle 22 of one injection unit 1 is positioned so as to match the guide hole 23 of the pedestal 21, and the locking cylinder 28 drives the locking pin 29 to lock the locking protrusion 30 in the locking hole 27. Lock the injection unit 1. The injection mold 3 located below the injection unit 1 is pressed and clamped by a mold clamping cylinder 17. In this state, the injection unit 1 is lowered by the vertical drive cylinder 25, and the tip of the nozzle 22 is moved to the socket 13.
The resin is injected from the injection unit 1 into the cavity of the injection mold 3. Next, when the injection unit 1 is raised by the vertical drive cylinder 25 and the nozzle 22 is separated, the vertical rotary disks 6 and 7 are driven to rotate, and the next injection mold 3 is placed below the injection unit 1. Then, the mold is clamped by the mold clamping cylinder 17, and is injected from the injection unit 1 in the same manner as described above to form the injection mold 3.
It is molded in. In this way, molding is performed sequentially using a plurality of injection molding molds 3. When the injection mold 3 with the molded product molded in the cavity comes above the wheel storage recess 19, the wheel part 16 is lowered by the mold opening cylinder 18, and the movable rod 15
The movable mold plate 12 is moved through the mold, the mold is opened, and the molded product is taken out. On the other hand, a plurality of injection units 1
Among the remaining injection units 1 that are not used for injection, material changes such as color changes, material changes, compounding changes, etc. are performed. Next, when changing the material, lock pin 2 is removed using lock cylinder 28.
9 to remove the locking protrusion 30 from the lock hole 27, insert the rod 33a into the guide bush 32 using the interlocking cylinder 33, rotate the upper and lower rotating discs 6 and 7 to rotate the base 2, and then The injection unit 1 is positioned above the guide hole 23. At this time, the elongated hole 26 slides against the lock pin 29, and the injection unit 1 is positioned at a predetermined position. Next, the rod 33a is pulled out from the guide bush 33 using the interlocking cylinder 33, and the locking cylinder 28
The locking pin 29 is lowered to lock the locking protrusion 30 in the locking hole 27.

In addition, FIGS. 4a and 4b show other embodiments of the description,
A lock hole 27 corresponding to the injection unit 1 is provided in the base 2.
A straight rod-shaped lock pin 29 driven by a lock cylinder 28 can be locked in any of the lock holes 27.

As described above, the present invention has a guide hole that guides the nozzle of an injection unit in a pedestal placed above the injection molding die to make the nozzle correspond to the injection molding die, and a base rotatably placed on the pedestal. A plurality of injection units are mounted on the base so as to be located on the circumference around the rotation axis of the base, and a locking means is provided to lock the base when the nozzle of the appropriate injection unit and the guide hole match. By rotating the base on which multiple injection units are mounted, the nozzle of one of the injection units can be selectively communicated with the injection mold and locked. Even a machine can mold using multiple injection units, and preparations can be made for material changes such as color changes, material changes, and combination changes to injection units that are not used for injection, and injection can be performed simply by rotating the base. It has the advantage that the molding unit can be changed to change the material, reducing lost time and greatly improving the operating rate.

[Brief explanation of drawings]

Fig. 1a is a partially cutaway front view of one embodiment of the device of the present invention, Fig. 1b is a partially omitted plan view of the same, Fig. 2a is a plan view of the upper part of the same, and Fig. 2b is the 2a is a cross-sectional view taken along the line X-X' in Figure 2a, Figure 3 is an enlarged sectional view of the lock pin portion of the same as above, Figure 4a is a schematic plan view of another embodiment of the same as above, and Figure 4b is Figure 4a. 2 is a cross-sectional view taken along the line Y-Y' of
is a guide hole.

Claims (1)

[Claims] 1. A vertical injection molding machine in which an injection unit that injects material and an injection mold that molds the resin injected from the injection unit are arranged vertically opposite each other so that the injection unit is located above the injection mold. In this method, a guide hole is provided in the pedestal placed above the injection molding mold to guide the nozzle of the injection unit so that the nozzle corresponds to the injection molding die, and a guide hole is provided in the pedestal placed above the pedestal so that the nozzle corresponds to the injection molding die. A plurality of injection units are mounted so as to be located on the circumference around the rotation axis of the injection unit, and a locking means is provided to lock the base when the nozzle of the appropriate injection unit and the guide hole match. Features: Material changing device for injection molding machines.