JPH0243701Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stroke setting device for a hydraulic ejector for a vertical injection molding machine.

In an injection molding machine, a hydraulic ejector is provided regardless of whether it is vertical or horizontal in order to eject a molded product from a mold.

By the way, in a hydraulic ejector, setting the ejector stroke is important, so in the past, the stroke was detected by a limit switch or other stroke detection device, and the hydraulic solenoid valve was switched and stopped to determine the advance limit interval, that is, the edge stroke. Ektastroke was set.

However, according to this conventional example, it is difficult to stop a large machine in which the ejector plate is heavy, especially a vertical injection molding machine, at the correct position due to inertia force or the like. As the ejector speed increases to shorten the cycle, overruns tend to occur. In a vertical injection molding machine, if a stroke setting device, such as a bolt, is installed at a high location, it becomes difficult to adjust it.

There were other problems.

Therefore, the present invention provides a vertical injection molding machine with
In an ejector platen disposed above a movable platen having an upper die and a telescoping hydraulic ejector mechanism, the ejector plate is provided with a telescoping hydraulic cylinder mechanism for stroke setting, and the piston rod of the cylinder mechanism is fixed. By making it freely openable, the disadvantages of the conventional example described above are solved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Figure 1, which shows the outline of a vertical injection molding machine,
Reference numeral 1 denotes a bed, on the upper surface of which a lower mold 2 is detachably provided. A movable platen 3 has an upper mold 4 attached thereto in correspondence with the lower mold 2, and is movable up and down via a mold clamping cylinder mechanism 5.

The movable platen 3 is movable up and down using a tie rod 7 having a top platen 6 as a guide, and resin etc. can be injected into the cavity defined by the upper and lower molds 2 and 4 via the injection mechanism 8. ing.

In the first embodiment shown in FIG.
A plurality of hydraulic cylinders 10 are erected and fixed on the ejector plate 9 arranged above, and a piston rod 11 fixed to the movable platen 3 is fitted into each of the hydraulic cylinders 10. An ejector mechanism 12 is configured.

In this example, two ejector pins 13 are attached to the ejector plate 9, and the ejector pins 13 penetrate the movable platen 3, and are connected to a protruding pin 14 that can freely retract from the molding surface of the upper die 4 via a connecting plate 15. are connected.

Reference numeral 16 indicates a guide pin, and reference numeral 17 indicates a pulling pin.

Therefore, when hydraulic pressure is supplied from the circuit 18A by operating the control valve mechanism 18 of the telescopic ejector mechanism 12, the ejector platen 9 is lowered and the molded product is lifted up via the ejector pin 13, the protruding pin 14, etc. The mold can be released from the mold 4, and the ejector plate 9 can be raised by applying hydraulic pressure to the circuit 18B.

Accordingly, in the first embodiment shown in FIG. 2, as a means for setting the descending (forward) stroke of the ejector plate 9, one stroke setting telescopic hydraulic cylinder mechanism 19 is provided at the center of the ejector plate 9 in plan view. is provided, and this cylinder mechanism 1
The ejector mechanism 12 is provided at a symmetrical position on both sides of 9.

That is, the cylinder tube 20 is erected and fixed on the center of the ejector plate 9 in plan view, and the piston rod 21 fitted into the tube 20 passes through the ejector plate 9 and extends toward the movable platen 3. A locking member 2 that fixes and opens the piston rod 21 in the tube 20.
2, and a pair of ejector mechanisms are provided on both sides of the cylinder mechanism 19 with the center of the cylinder mechanism 19 as the axis of symmetry.

The locking member 22 is a tube body with an elastic force applied in the direction of tightening the piston rod 21. When hydraulic pressure is applied to the tube body, it becomes unlocked, and when no hydraulic pressure is applied, the elastic force is released. The piston rod 21 is tightened and fixed by the piston rod 21, and in the first embodiment, a pulse encoder 23 is employed as the control means.

That is, by extending the rack member 24 from the rod 21 and detecting the stroke of the rack member 24 with the pulse encoder 23, the action of hydraulic pressure on the lock member 22 can be controlled.

In the second embodiment shown in FIG. 3, the stroke can be set by the hydraulic control system of the telescopic ejector mechanism 12 and the hydraulic control system 25 of the telescopic cylinder mechanism 19 for stroke setting.

That is, the hydraulic pressure in the locking member 22 is applied via the circuit 26 to unlock the piston rod 21, and the hydraulic pressure is applied via the circuit 27 to lower the piston rod 21.

Next, the ejector plate 9 is lowered by the required stroke by operating the valve mechanism 18, and then the valve mechanism 18 is turned off.

Then, when the hydraulic pressure of the circuits 26 and 27 is released, the lock member 22 tightens the rod 21 and is locked, and when the valve mechanism 18 is switched in the direction in which the ejector plate 9 is raised, the piston rod 21
The distance between the end of the movable platen 3 and the movable platen 3 becomes a set stroke.

In summary, the present invention is such that the fixed lower mold 2 and the upper mold 4 provided on the movable platen 3 are movable up and down via the mold clamping cylinder mechanism 5, and the movable platen 3
and ejector plate 9 placed above this
In the stroke setting device for a hydraulic ejector for a vertical injection molding machine in which the two are connected via a telescoping hydraulic ejector mechanism 12, a telescoping hydraulic cylinder mechanism 19 for stroke setting is provided on the center of the ejector plate 9 in plan view. A piston rod 21 of the hydraulic cylinder mechanism 19 passes through the ejector plate 9 and extends toward the movable platen 3, and a lock member 22 for fixing and opening the piston rod 21 is of the telescopic type for setting the stroke. A stroke setting device for a hydraulic ejector for a vertical injection molding machine, which is built into a hydraulic cylinder mechanism 19 and has the ejector mechanisms 12 on both sides with the center of the cylinder mechanism 19 as the axis of symmetry. Therefore, it has the following advantages.

It is possible to accurately set the stroke even with a high-speed, large-sized hydraulic ejector.

Telescopic hydraulic cylinder mechanism 19 for stroke setting
is provided on the center of the ejector plate 9 in plan view, and a pair of ejector mechanisms 12 are provided on both sides with the center of this cylinder mechanism 19 as the axis of symmetry, so that the stroke setting stopper can be adjusted while ensuring the ejecting action. Adjustment can be made easily. especially,
When there is one stopper and a plurality of stoppers are provided, the need for tuning means for each stopper can be omitted.

It is possible to prevent mold damage due to overrun, and the stroke can be set by remote control.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is an overall configuration diagram of a vertical injection molding machine, Fig. 2 is a front view of the first embodiment of the invention, and Fig. 3 is a front view of the second embodiment of the invention. be. 2... Lower die, 3... Movable platen, 4... Upper die, 5... Mold clamping cylinder mechanism, 9... Ejector plate, 12... Ejector mechanism, 19...
Cylinder mechanism for stroke setting, 21...piston rod, 22...lock member.

Claims (1)

[Claims for Utility Model Registration] A fixed lower mold 2 and an upper mold 4 provided on a movable platen 3 are movable up and down via a mold clamping cylinder mechanism 5, and are arranged above the movable platen 3. In a stroke setting device for a hydraulic ejector for a vertical injection molding machine, in which an ejector plate 9 is connected via a telescoping hydraulic ejector mechanism 12, a telescoping hydraulic cylinder for stroke setting is placed on the center of the ejector plate 9 in plan view. A mechanism 19 is provided, in which a piston rod 21 of the hydraulic cylinder mechanism 19 passes through the ejector plate 9 and extends toward the movable platen 3, and a lock member 2 is provided for fixing and opening the piston rod 21.
2 is built in the telescopic hydraulic cylinder mechanism 19 for stroke setting, and the ejector mechanisms 12 are disposed on both sides with the center of the cylinder mechanism 19 as the axis of symmetry.
A stroke setting device for a hydraulic ejector for a vertical injection molding machine.