JP3343777B2 - Injection molding equipment with lifting unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus in which an injection unit can move up and down and can easily cope with a change in a position of a sprue bush of a mold.

[0002]

2. Description of the Related Art An injection molding apparatus includes an injection unit for plasticizing and injecting a molding resin material, and a mold for molding a molten resin injected from the injection unit in a molding space in the mold. A mold apparatus comprising a mold mounting plate for attaching the mold, and a mold clamping unit for performing mold opening and mold clamping in the mold apparatus, wherein each of these devices is a horizontal mount. To form a horizontal injection molding apparatus.

[0003] The injection molding apparatus has a feature that molded articles of various shapes can be produced by one apparatus by exchanging a mold. However, when using an injection molding apparatus of the same scale, there are cases where the sprue bush in the mold must be provided at a position higher or lower than usual depending on the type or size of the target molded product. .

FIG. 1 shows a locating ring having a cavity mold 2 and a core mold 3 when a sprue bush 1 in a mold of a mold apparatus is higher than usual, a nozzle 4 of an injection unit, and a vertically long opening 6. The positional relationship of the part fixing platen 5 is shown. The locate ring fixed platen 5 is fixed to the gantry 7, and the cavity mold 2 is fixed to the locate ring fixed platen 5. In FIG. 1, illustration of other components in the injection molding apparatus, for example, a mold clamping apparatus, an injection unit, and the like is omitted.

When the position of the sprue bush 1 is higher than the position of the normal sprue bush 1 as in the mold apparatus of FIG.
Needs to be matched with the height of the nozzle 4 of the injection unit.
Conventionally, it is adjusted and fixed by slightly shifting it downward. However, the vertical position adjustment of the mold is limited by the scale of the mold apparatus, and the adjustment width cannot be large.
The fact is that there are cases where injection molding apparatuses of the same scale cannot cope. Further, when the mold is shifted vertically, the center of gravity of the mold device is changed, and there is a problem that the stability in the mold clamping / mold opening operation is deteriorated.

[0006] On the other hand, there has been conventionally known an injection molding apparatus in which an injection unit can be moved horizontally with respect to an arbitrary horizontal position of a sprue bush of a mold to flexibly cope with it (manufactured by Aburg Co., Ltd .: 270M). . However,
The horizontally moving injection unit cannot be applied to a mold having a sprue bush that is eccentric vertically. In addition, the injection unit that moves horizontally requires an installation area in the horizontal direction, and there is a problem that the installation space is limited when installing peripheral devices and the like.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an injection molding apparatus capable of adjusting the optimum nozzle position of an injection unit with a simple operation for a mold having a sprue bush which is eccentric in the vertical direction. It is intended to provide a device.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention synchronizes each of the lifting and lowering parts with hydraulic pressure distributed by a flow divider to raise and lower the injection unit uniformly in a horizontal position. An injection molding apparatus with a lifting unit, comprising: at least four lifting units capable of adjusting the nozzle position of the injection unit so that the nozzle position can be adjusted vertically.

In the injection molding apparatus with a lifting unit according to the present invention, the lifting unit includes a lifting guide for guiding vertical movement, a lifting hydraulic cylinder for applying vertical movement by applying hydraulic pressure, and a plurality of lifting hydraulic cylinders. the lifting guide across mounted, including a fastenable lifting beam lifting guide in moving and any position is guided to the elevation guide.

In the injection molding apparatus with a lifting unit according to the present invention, the lifting hydraulic cylinder of the lifting unit is driven by application of hydraulic pressure of a hydraulic pump having a variable discharge amount using an inverter-controlled electric motor as a power source. Desirably, in that case, the pump discharge amount becomes variable. Therefore, the pump discharge amount can be made variable, and the elevating operation can be performed at a low speed at the time of starting the elevating operation and at a high speed when the operation starts. In the injection molding apparatus with a lifting unit according to the present invention, it is desirable that a support block for fixing a stop position of the injection unit after the lifting of the injection unit be combined.

[0011] In the mold mounting apparatus of the injection molding apparatus with the lifting unit according to the present invention, the locating ring portion having a vertically long opening capable of guiding and receiving the nozzle corresponding to the vertical movement of the nozzle position of the injection unit. It is preferable to provide a mold apparatus having a fixed platen (abbreviation: locating ring portion fixed platen) on which the fixing platen is fixed.

[0012]

FIG. 2 is a front sectional view of a locating ring portion fixing platen in an injection unit and a mold device of an injection molding apparatus with an elevating unit according to the present invention (a mold device other than a locating ring portion fixing platen, FIG. 3 shows a right side view of FIG. 2, and FIG. 4 shows a hydraulic circuit diagram of the injection molding apparatus of the present invention.

An embodiment of the present invention will be described with reference to FIGS.

Reference numeral 11 denotes an injection unit. The injection unit 11 is disposed so as to move forward and backward along a guide bar 12. The guide bar 12 is supported by a support block 13 and is fixed to the gantry 7. Reference numeral 14 denotes an elevating beam for raising and lowering the injection unit 11, which can support the load of the elevating injection unit 11 and is fastened to the guide bar 12 via an elevating beam fastening part 15.

Reference numeral 16 denotes an elevating guide for guiding the elevating beam 14 in the elevating direction, and reference numeral 17 denotes an elevating hydraulic cylinder for elevating the elevating beam 14 by pump pressure and elevating the injection unit 11. The lifting beam 14,
An elevating unit is constituted by the elevating beam fastening part 15, the elevating guide 16, and the elevating hydraulic cylinder 17, and at least four elevating units constitute one injection unit 1.
1 is moved up and down. Each of the lifting units can raise and lower each part of the injection unit 11 evenly by uniform hydraulic pressure.

The lifting unit includes a lifting beam fastening portion 1
At 5, it is detachable from the guide bar 12. Therefore, in one injection molding apparatus, after the vertical position of the nozzle of the injection unit 11 is adjusted and fixed by the lifting unit, the lifting unit can be removed and applied to another injection molding apparatus. Can be shared by devices. The lifting beam 14 can be easily attached to the guide bar 12 of the injection unit 11 of the existing injection molding apparatus. Reference numeral 18 denotes a hydraulic pump unit that can generate an equal oil pressure for each lifting unit, and has a hydraulic circuit in which a flow divider is incorporated to generate an equal oil pressure. A caster is provided on the bottom surface of the hydraulic pump unit 18 so that the pump can be moved and can be sequentially used by a plurality of other injection molding machines by one pump.
Reference numeral 19 denotes a high-pressure rubber hose for transmitting the hydraulic pressure generated by the hydraulic pump unit 18 to each of the lifting hydraulic cylinders 17.

FIG. 4 shows an example of a hydraulic circuit used in the injection molding apparatus with a lifting unit according to the present invention, and shows a case where uniform hydraulic pressure is supplied to each lifting hydraulic cylinder 17 of four lifting units. . As shown in the hydraulic circuit of FIG. 4, the oil pressure is evenly distributed by the flow divider 20, and is again evenly distributed by the flow divider 20, so that it is possible to obtain the oil pressure equally distributed to four. It can be applied to four lifting hydraulic cylinders 17 by four distributed equal hydraulic pressures. Therefore,
Even if there is a load change in any of the four lifting hydraulic cylinders 17, all the lifting hydraulic cylinders 17 are synchronized to have an even hydraulic pressure.

The electric motor (not shown) for driving the pump for driving the hydraulic pump unit 18 is preferably controlled by an inverter. The frequency is variable by the inverter control, and the pump discharge amount of the hydraulic pump unit 18 is variable. And smooth and detailed control becomes possible. For example, by making the pump discharge amount variable,
It is possible to adjust the injection unit 11 so that the speed becomes low at the time of starting up and down, and when the injection unit 11 starts to move, the speed becomes high, so that the vertical movement can be completed efficiently in a short time.
The elevating operation can be performed at another place by the remote controller 21.

Next, an operation method of the injection molding apparatus with the lifting unit according to the present invention will be described with reference to FIGS. The hydraulic pump unit 18 is turned on, and the generated hydraulic pressure is applied to the lifting hydraulic cylinder 17 through the high-pressure rubber hose 19. The lifting hydraulic cylinder 17 is moved by the applied hydraulic pressure, and the lifting beam 14 is guided and raised by the lifting guide 16, thereby raising the injection unit 11 to the position of the sprue bush 1 of the mold apparatus. At this time, when the injection unit 11 starts rising, the pump discharge amount of the hydraulic pump unit 18 is reduced to a low speed, and the injection unit 11
When starts moving, it adjusts at high speed and performs efficient moving operation. At this time, the hydraulic pressure applied to each of the lifting hydraulic cylinders 17 is evenly distributed by the flow divider 20, so that even if there is a load fluctuation in any of the four lifting hydraulic cylinders 17, the fluctuation is absorbed. Be equal.

When the injection unit 11 is moved up and down, a support block 13 for supporting the guide bar 12 is removed.
At the time point when the movement of the injection unit 11 is completed, the guide bar 12 is supported and fixed by being replaced with the support block 13 which is longer by the ascending amount or shorter by the descending amount. As described above, since the injection unit 11 is supported and fixed on the gantry 7 by the support block 13 and is not fixed by hydraulic pressure, there is no trouble such as a change in nozzle position due to a hydraulic pressure leak during injection molding.

[0021]

According to the present invention, since the lifting units of at least four lifting units are synchronized by the hydraulic pressure evenly distributed by the flow divider, the injection unit is raised and lowered uniformly in the horizontal position. The nozzle position of the injection unit can be adjusted up and down freely and stably.

According to the present invention, when the vertical adjustment of the nozzle position of the injection unit is completed, the injection unit can be supported and fixed by using a support block having an appropriate length, so that a stable nozzle position can be maintained. it can.

The elevating unit used in the injection molding apparatus with the elevating unit according to the present invention can be detachable and can be used for a plurality of other injection molding apparatuses.

The power supply for driving the pump for raising and lowering the lifting unit used in the injection molding apparatus with the lifting unit of the present invention can be controlled by an inverter, and the lifting and lowering can be completed efficiently in a short time.

[Brief description of the drawings]

FIG. 1 shows a positional relationship between a cavity mold, a core mold, a nozzle of an injection unit, and a locate ring portion fixing platen having a vertically long opening when a sprue bush in a mold of a mold apparatus is at a high position. I have.

FIG. 2 is a front sectional view of an injection unit and a locating ring portion fixing platen in a mold apparatus of the injection molding apparatus with a lifting unit according to the present invention.

FIG. 3 is a right side view of the injection molding apparatus with a lifting unit according to the present invention shown in FIG. 2;

FIG. 4 shows an example of a hydraulic circuit used in the injection molding apparatus with a lifting unit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sprue bush 2 Cavity mold 3 Core mold 4 Nozzle 5 Locating ring fixed platen 6 Vertically long opening 7 Stand 11 Injection unit 12 Guide bar 13 Support block 14 Elevating beam 15 Elevating beam fastening part 16 Elevating guide 17 Elevating hydraulic cylinder 18 Hydraulic pump unit 19 High pressure rubber hose 20 Flow divider 21 Remote control

Claims (4)

(57) [Claims] 1. An apparatus comprising at least four lifting units capable of synchronizing each lifting part with hydraulic pressure distributed by a flow divider to raise and lower an injection unit uniformly in a horizontal position. Move
An elevating guide for guiding, and upper and lower
Lifting hydraulic cylinders for moving the
Attached over the descending guide, guided to the elevating guide
That can be moved and fastened to the lift guide at any position
An injection molding apparatus with an elevating unit, including a descending beam, so that the nozzle position of the injection unit can be adjusted up and down freely. 2. A hydraulic cylinder the lifting is claim 1 inverter controlled motor in which the discharge amount that the power source is driven by the application of the oil pressure of the variable hydraulic pump
The injection molding apparatus with the lifting unit described in the above. 3. The hydraulic pressure distributed by the flow divider
Synchronize the lifting and lowering sections with the injection unit in the horizontal position.
At least four lifts that can be raised and lowered uniformly
With the unit, the nozzle position of the injection unit
Location to a vertically freely adjustable, corresponds to the vertical movement of the nozzle position of the injection unit, characterized by having a locating ring portion fixed platen having a capable Vertical Torukuchi to accept and guide the nozzle vertical movement Injection molding equipment with unit. 4. The hydraulic pressure distributed by the flow divider
Synchronize the lifting and lowering sections with the injection unit in the horizontal position.
At least four lifts that can be raised and lowered uniformly
With the unit, the nozzle position of the injection unit
Location to a vertically freely adjustable, said injection unit support block is combined injection molding device with a lifting unit, characterized in that that for fixing the stop position of the injection unit after the lifting of.