JPS595555Y2 - Injection molding machine - Google Patents

Description

[Detailed explanation of the idea] Many injection molding machines are of the in-line screw type, but in order to obtain a large injection amount, a large diameter screw is required, and if a large diameter screw is used, a large In order to obtain injection pressure, the oil pressure within the injection cylinder must be increased or the pressure receiving area of the piston must be increased.

For this reason, a screw plunger type injection molding machine is used in which the raw material is plasticized using a screw, the plasticized raw material is stored in an injection cylinder, and the plasticized raw material is injected into the mold cavity using a plunger that reciprocates within the injection cylinder. There is.

The present invention relates to a vertical injection molding machine for rubber using a screw plunger type injection device, and is further characterized in that the injection device can be moved close to and away from the fixed plate by using a common stay for the mold clamping device. It is something.

Next, the present invention will be explained according to the drawings.

1 is a mold clamping cylinder, 2 is a mold clamping cylinder flange, and 3 is a machine stand placed on the floor.

Reference numeral 4 designates a seat plate, and the seat plate 4 is placed on the four corners of the machine base 3, the collar 2 of the mold clamping cylinder 1 is placed on the seat plate 4, and the mold clamping cylinder 1 is secured with four bolts. Fix it to the machine base.

Four stays 6 are installed upright on the flange portion 2 of the mold clamping cylinder 1,
A fixed platen 7 is fixed at a fixed position facing the flange 2 of the mold clamping cylinder 1.

The stay 6 is tensioned between the collar 2 of the mold clamping cylinder 1 and the fixed platen 7 by a nut 6H.

The stay 6 penetrates the fixed platen 7.

Reference numeral 8 denotes an injection device pedestal, and a bushing 9 is fitted into the injection device pedestal 8 at a position corresponding to the stay 6, and the stay 6 is passed through the bush.

Two shift cylinders 10.11 are fixed to the injection device pedestal 8, and the tips of piston rods 10a and 11a of the shift cylinders 10.11 are fixed to the stationary plate 7.

The protruding plates 12 and 13 are fixed to the injection device pedestal B in a cantilevered manner.

A bracket 14 is fixed to the protruding plate 12 on the left side in the figure.

15 is a heating cylinder, and the rear part of the heating cylinder is fixed to the bracket 14.

A screw 16 is rotatably fitted into the heating cylinder 15.

A hydraulic motor 17 is fixed to the bracket 14 so as to rotate the screw 16.

Reference numeral 18 denotes a bracket fixed to the protruding plate 13 fixed to the right side of the injection device pedestal 8.

19 is an injection cylinder, and a plunger 2 reciprocates with the injection cylinder.
Insert 0.

The plunger 20 is actuated by the injection hydraulic cylinder 21.

Reference numeral 22 denotes a head fixed in a suspended state at the center of the injection device pedestal 8, and the tips of the heating cylinder 15 and the injection cylinder 19 are fixed to the head 22 in a state facing each other to prevent molten resin from leaking. ing.

A nozzle 23 is fixed at right angles to the axial direction of the heating cylinder 15 and the injection cylinder 19.

24 is a rotary valve, and as shown in FIG. 3, a pinion gear 25 fixed to the end of the shaft in the same manner as the shaft of the rotary valve 24 meshes with a rack 28 carved in the piston rod 27 of the hydraulic cylinder 26. Actuation of the hydraulic cylinder 26 causes the rotary valve 24 to rotate 90 degrees.

29 is a movable platen, and a ram 30 is inserted into the mold clamping cylinder 1.
The movable platen moves up and down along the stay 6 by the reciprocating movement of the ram 30.

31 is a hopper provided at the raw material drop port 32 of the heating cylinder 15.

Next, the operation will be explained. Male and female molds (not shown) are attached to the fixed platen 7 and the movable platen 29, respectively, by raising the movable platen and closing the molds.

The shift cylinders 10 and 11 are driven to lower the injection device pedestal 8 along the stay 6 and press the tip of the nozzle 23 to the mold.

Next, the hydraulic motor 17 is driven to rotate the screw 16, so that the raw material in the hopper 31 is dropped onto the screw 16, and the raw material is sent to the tip of the screw while being plasticized.

At this time, the convex portion of the rotary valve 24 faces upward so that the raw material plasticized by the rotation of the screw 16 can be transferred to the injection cylinder 19.

Plasticized raw material is stored in an injection cylinder 19 provided with a heater on the outer periphery, pressure is generated, and when the pressure at the tip of the plunger 20 overcomes the back pressure of the injection hydraulic cylinder 21, the plunger 20 retreats.

When a certain amount of plasticized raw material is stored in the injection cylinder, that is, the plunger moves back a certain distance, the position of the rear end of the plunger is confirmed by a limit switch (not shown), and the hydraulic motor 1
7 is stopped.

Next, the rotary valve is rotated to the device shown in FIG.
1), the plasticized raw material passes through the passage 23a of the nozzle 23 and fills the mold cavity.

After the raw material in the mold cavity has solidified, the movable platen 29 is lowered to open the mold and take out the molded product.

Then, the hydraulic motor 17 is rotated again to repeat the cycle.

As mentioned above, the present invention has a heating cylinder 15 for plasticizing raw materials.
The injection tube 19 for injecting the raw material is opposed to the injection device, and the injection device is fixed to the injection device pedestal 8, and the injection device pedestal 8 is moved along the stay 6, so that the nozzle 23 is placed exactly in the center of the fixed plate 7. The ability to align the centers is an effect of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view (including a partial cross section) of the device of the present invention, FIG. 2 is a plan view of the device, and FIG. 3 is an enlarged view of the main parts. 1: Clamping cylinder, 3: Machine base, 6: Stay, 7: Fixed plate, 8: Injection device pedestal, 15: Heating cylinder, 16: Screw,
19: Injection tube, 23: Nozzle, 24: Rotary valve.

Claims (1)

[Scope of utility model registration request] The flange 2 of the mold clamping cylinder 1 is fixed to the machine base 3, and the flange 2,
Four stays 6 are passed through holes provided at the four corners of the movable platen 29, the fixed platen 7, and the injection device pedestal 8, and one end of the stays 6 is fastened to the collar portion 2 with a bolt 6a. , on the other hand, the fixed platen 7 is fastened to the stay 6 with the Nara)-6a, the movable platen 29 is fixed to the tip of the ram 30 inserted into the mold clamping cylinder 1, and the stay 6
A plurality of shift cylinders 10 are fixed to the lower surface of the injection device pedestal 8, and the tip of the piston rod 10a inserted into the shift cylinder 10 is fixed to the fixed plate 7. A heating cylinder 15 into which a screw 16 for making the device pedestal 8 vertically movable along the stay 6 and for plasticizing the raw material is rotatably fitted therein is fixed to a bracket fixed to the lower surface of the injection device pedestal 8 to plasticize the raw material. An injection cylinder 19 for storing and injecting raw material is fixed to a bracket fixed to the lower surface of the injection device pedestal 8 so as to face the heating cylinder 15.
and the injection device pedestal 8 to support the tip of the injection tube 19.
A head 22 with one end fixed to the lower surface of the head 2 is provided.
One end of the nozzle 23 is fixed at the center of the nozzle 2, and during raw material plasticization, the plasticized raw material is transferred only into the injection cylinder, and during injection, the raw material in the injection cylinder 19 flows through the passage 23 of the nozzle 23.
An injection molding machine characterized by being provided with a rotary valve 24 that allows flow only to a.