JPS6343058Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shut-off valve device for an injection molding machine.

When resin is injection molded via a hot runner block in an injection molding machine, the nozzle of a heating cylinder is touched to the hot runner block according to the molding cycle to inject the resin. In this case, in order to prevent resin leakage after injection, a shut-off valve device for opening and closing the molten resin passage is required on each of the nozzle side and the hot runner side, and both must be opened and closed at the same time.

Here, a conventional example of a mechanism for simultaneously opening and closing two shutoff valves will be described. Two sets of actuators and their control circuits were provided independently to open and close each shut-off valve. Therefore, the number of parts is large, and the number of assembly steps is also large, making the cost high.

The present invention eliminates these drawbacks, and its purpose is to provide a shutoff valve for each of the nozzle and hot runner block, and to
An object of the present invention is to provide a shut-off valve device for an injection molding machine in which multiple shut-off valves are simultaneously opened and closed by one actuator.

The present invention will be explained below with reference to figures shown in one embodiment. 1 and 2, a nozzle 15 is attached to the tip of a cylinder head 13 via a holder 14, which is fixed to the tip of a heating cylinder 11 by a bolt 12. The nozzle 15 is a nozzle receiver 1 attached to a hot runner block 16.
It borders on 7. A shaft-shaped valve body A20 and a valve body B21 are rotatably inserted into the resin passage 18 of the holder 14 and the resin passage 19 of the hot runner block 16, and these valve bodies A20 and B21 are made of resin. It has flow holes 22 and 23.

One end of an arm A26 is fixed to both ends of the valve body A20, and the other end of the arm A26 is attached to a link A2.
It is connected to an elongated hole 28 provided at one end of 7 by a pin 29. The middle of the link A27 is rotatably supported by a support 30 fixed to the cylinder head 13 via a pin 31, and the piston rod 33 of the cylinder 32 attached to the support 30 has a pin 34 fixed in the middle. It is connected to a long hole provided at the other end of the link A27.

One end of an arm B36 is also fixed to both ends of the valve body B21, and the arm B36 is inserted into a long hole 40 provided at one end of a link B39 rotatably supported by a pin 38 to a member 37 fixed to the hot runner block 16. A fixed pin 41 is connected to the other end. Link C4 is attached to pin 29 of arm A26.
One end of the link C46 is rotatably connected, the other end of the link C46 contacts the upper part of the link B39, and the support member 3
One side of the link D47 is rotatably connected to the other side of the link D47 by a pin, and the middle of the link C46 is connected to the other side of the link D47 via a pin.

Next, the operation of the embodiment described above will be explained.
Since FIG. 2 shows the state when the injection is completed, the screw 51 is at the forward limit position, and immediately after the injection is completed, the valve body A20 and the valve body B21 rotate, and the resin flow hole 22 and the valve body B21 rotate as shown in the figure. 23 is oriented in the direction perpendicular to the plane of the paper. Therefore, the resin passage 18 of the holder 14 and the resin passage 19 of the hot runner block 16 are closed. After this, the mold was opened,
When metering begins with the resin passages 18 and 19 in this state, the screw 51 rotates and retreats (moves to the left in the figure), and the molten resin is stored on the right side thereof. When a certain amount of molten resin is stored in this way, injection takes place, and at this time the cylinder 32 in FIG.
The piston rod 33 of the piston rod 33 is moved forward. As the piston rod 33 moves forward (moves it to the right in the figure), both the link A27 and the link B39 are rotated counterclockwise, and as a result, the valve body A20 and the valve body A
21 are both rotated 90 degrees clockwise to connect the resin passage 18 of the holder 14 and the hot runner block 1.
Since the resin passages 19 of No. 6 are in communication with each other, injection is possible.

Immediately after injection is completed, the piston rod 33 retreats, and as a result, the valve body A20 moves toward the arm A26.
and is rotated 90 degrees via the link A27, and as shown in FIG. 2, the resin flow hole 22 faces in the direction perpendicular to the plane of the paper and closes the resin passage 18 to the right. Valve body A
At the same time as the valve body B20 is rotated, the link C46 whose one end is connected to the arm A26 presses the upper part of the link B39 and rotates it clockwise, so the valve body B21 is rotated 90 degrees and the resin passage 19 is moved to the left. Close against.

When the valve bodies A20 and B21 rotate, the injection cylinder 11 moves backward (moves to the left in FIG. 1),
At this time, link B on the hot runner block 16 side
39 is a piston rod 33 on the injection cylinder 11 side
Since it is only in contact with the link C46, the backward movement is performed without any abnormality. Next, when the resin in the cavity cools and solidifies, the movable mold is opened and the product is taken out, completing the series of molding operations.

As mentioned above, the injection molding machine shut-off valve device according to the present invention is used in an injection molding machine that injects molten resin in a heated cylinder into a mold cavity via a hot runner block that moves in the mold opening/closing direction. Valve bodies A and B are rotatably provided through the resin passages of a holder and a hot runner block attached to the front end of the cylinder via the cylinder head, and have resin flow holes in a direction perpendicular to the axis; Arms A and B have one side fixed to both ends of main bodies A and B, links A and B have one side connected by a pin fixed to the other side of arms A and B, and the other side of arm A. A cylinder is connected to the middle of the piston rod, and the tip of the piston rod is connected to the other side of link B, and one side is connected to the other side of arm A, the other side is connected to one side of link B, and the middle is connected to the cylinder. It consists of a link D connected on one side to a support fixed to the head, and a link C supported by the other side.

Therefore, in this invention, compared to the conventional method using two cylinders and their control circuit,
Although there are two shut-off valves, only one cylinder drives them, which has the advantage of reducing the number of parts and lowering costs.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 2-2 in FIG. 11... Heating cylinder, 13... Cylinder head, 14... Holder, 16... Hot runner block, 18, 19... Resin passage, 20... Valve body A, 21... Valve body B, 22, 23... …
Resin flow hole, 26... Arm A, 27... Link A, 29, 31, 34, 38, 41... Pin, 3
2...Cylinder, 33...Piston rod, 36
...Arm B, 39...Link B, 46...Link C, 47...Link D.

Claims (1)

[Scope of Claim for Utility Model Registration] In an injection molding machine that injects molten resin in a heating cylinder into a mold cavity via a hot runner block, a holder attached to the front end of the heating cylinder via a cylinder head; Valve bodies A and B are rotatably provided through both resin passages of the hot runner block and have resin flow holes in a direction perpendicular to the axis;
An arm A with one side fixed to each end of
and B, links A and B whose one side is connected by a pin fixed to the other side of the arms A and B, and the middle of the piston rod is connected to the other side of the link A, and the tip of the piston rod is connected to the link. A cylinder in contact with the other side of B, and one side connected to a support whose one side is connected to the other side of the arm A, the other side is in contact with one side of the link B, and the middle thereof is fixed to the cylinder head. A shut-off valve device for an injection molding machine, comprising a link C supported by the other side of a connected link D.