JPH0254767B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an injection unit that is mounted substantially horizontally on top of a mold clamping device that moves a movable mold horizontally forward and backward relative to a fixed mold to open and close the mold. Regarding injection molding machines.

[Prior art and its problems]

Conventionally, an injection molding machine that has a mold clamping device that moves a movable mold horizontally forward and backward relative to a fixed mold and opens and closes the mold has an injection unit 1 installed in the same direction as the mold opening and closing direction, as shown in Fig. 1. There is also one in which the injection unit 2 is provided in a direction perpendicular to the mold opening/closing direction as shown in FIG.

Today, the following technical demands are placed on these conventional devices.

1. Reduce the floor space occupied by the equipment and make it more compact.

2. Particularly when the injection unit is placed vertically, it is advantageous in terms of reducing the floor space occupied, but on the other hand, the ceiling height needs to be increased, and maintenance management including material input work is difficult. Furthermore, not only is the structure unstable and susceptible to vibrations from the opening and closing operations of the mold, but the injection unit is vertical, so the inertia due to the screw's own weight is large, making it difficult to improve the injection accuracy that is essential for precision molding. It is.

[Purpose of the invention]

The present invention was invented to eliminate the above-mentioned drawbacks and to meet the current technical demands, and provides an injection molding machine that occupies a small floor space, is compact, has high stability, and is suitable for precision molding. The purpose is to

[Configuration of the present invention]

In order to achieve the above-mentioned object, the present invention is an injection molding machine having a mold clamping device that opens and closes the mold by moving a movable mold horizontally forward and backward relative to a fixed mold. This is an injection molding machine that is equipped with a mounted injection unit, and this injection unit is rotatably locked by an actuator such as a hydraulic or pneumatic cylinder. This is an injection molding machine that has an injection unit with a nozzle attached to its tip that contacts the resin injection port of the mold at a right angle. Another configuration of the injection molding machine is that the injection unit is screwed onto an adjustment shaft attached to the upper part of the fixing member of the mold clamping device and can be adjusted in the vertical direction.

〔Example〕

Next, one embodiment of the present invention will be described with reference to FIG. 3. Reference numeral 10 denotes a frame, and a mold clamping device 11 is attached to the upper surface of the frame. The mold clamping device 11 is a fixed mold 1
A movable platen 15 with a movable mold 14 mounted thereon advances and retreats in the horizontal direction with respect to a fixed platen 13 with a movable mold 14 mounted thereon, while being guided by tie bars 17 by a mold clamping cylinder 16, and the molds 12 and 14 move toward the mold parting surface A. When they come into contact with each other, a cavity is formed. 18 is a fixing member integrally formed with the mold clamping cylinder 16. Reference numeral 19 denotes an injection unit which heats and melts the resin material introduced from the hopper 20 in a heating cylinder 21, and passes through a nozzle 2 attached to the tip thereof.
2, the molten resin is injected into the cavity formed by the molds 12 and 14.

Reference numeral 23 denotes a frame, one end of which is rotatably supported via a pin 26 by a pivot piece 25 into which an adjustment shaft 24 is fitted, and the other end is rotatably supported by a hydraulic cylinder 27. are connected,
The injection unit 19 is mounted and maintained substantially horizontally. Therefore, the nozzle 22 can inject resin into the cavity formed by the molds 12 and 14 at a substantially right angle to the direction of mold movement. Here, the adjustment shaft 24 and the hydraulic cylinder 27 that support both ends of the pedestal 23 will be explained in detail. The former has a screw formed at one end and is screwed into the upper part of the fixing member 18, so that the screwing dimension can be changed. This makes it possible to change the length of the part protruding from the fixing member 18, and the other end is rod-shaped and fits into the recess 25a of the pivoting piece 25 that supports the pedestal 23 on which the injection unit 19 is mounted. are doing.

Further, although the latter uses the hydraulic cylinder 27, the present invention is not limited to this, and a pneumatic cylinder or the like may be used, and any actuator that operates as described above may be used.

Next, to explain its action, first, pressure oil acts on the mold clamping cylinder 16 in response to the mold clamping operation signal.
The inserted ram (not shown) moves forward (moves to the right in the figure), thus moving the moving plate 15 connected to the ram.
The movable mold 14 also moves forward, and the movable mold 14 contacts the mold parting surface A of the fixed mold 12 to form a cavity.

Next, when pressure oil acts on the hydraulic cylinder 27 and an elongating motion is applied, the nozzle 22 uses the pin 26 as a fulcrum.
joins the inlet into the cavity formed by molds 12 and 14. Subsequently, the resin that has been melted and accumulated in the injection unit 19 in advance is injected to fill the cavity, thereby performing injection molding.

During injection operation, insert nozzle 2 into the cavity injection port.
2, the height of the injection unit 19, that is, the position of the nozzle 22 can be adjusted by rotating the adjustment shaft 24 to adjust the position in the vertical direction.

〔Effect of the invention〕

As explained above, in the injection molding machine according to the present invention, the injection unit is placed almost horizontally above the mold clamping device, so compared to the conventional injection molding machine in which the injection unit is installed in series with the mold clamping device. In addition to reducing the floor space, the height of the machine can be kept small compared to machines with vertical injection units, making the machine more compact overall. Furthermore, compared to a device with a vertical injection unit, not only is it easier to maintain and manage the injection of raw materials, but the vibrations caused by opening and closing the mold have a large effect on the instability of the conventional device. However, since the injection unit is horizontal as in the apparatus of the present invention, the influence of vibration is reduced. In addition, since there is no longer any variation in injection accuracy due to the weight of the screw, the drawbacks mentioned at the beginning have been resolved.

[Brief explanation of drawings]

1 and 2 are views showing conventional equipment, and FIG. 1 is a view of an injection molding machine in which a mold clamping device and an injection unit are connected in series. FIG. 2 is a diagram of an injection molding machine in which the injection unit is disposed perpendicular to the mold clamping device. Third
The figure is a diagram of an injection molding machine showing one embodiment of the present invention. 11... Mold clamping device, 12... Fixed mold, 14...
...Moving mold, 16... Mold clamping cylinder, 18... Fixed member, 19... Injection unit, 21... Heating cylinder, 22... Nozzle, 23... Frame, 24...
...Adjustment axis, 27...Hydraulic cylinder.

Claims (1)

[Claims] 1. In an injection molding machine in which an injection unit is mounted on top of a mold clamping device that moves a movable mold horizontally forward and backward relative to a fixed mold to open and close the mold, the injection unit has one end connected to the machine base. Or, the fixed member is rotatably locked by a pin, and the other end is rotatably mounted around the upper part of the fixed member as a fulcrum by an actuator such as a hydraulic or pneumatic cylinder rotatably locked to the injection unit. A nozzle for injecting resin into the mold is locked at the tip of the heating cylinder, which contacts the resin injection port of the mold at a substantially right angle to the direction of mold movement during injection operation. ,
An injection molding machine in which the injection unit is placed substantially horizontally by adjusting it in the vertical direction by an adjustment shaft screwed onto the upper part of the fixing member of the mold clamping device.