JP3639904B2 - Electric direct pressure vertical molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical molding machine provided with a direct pressure type clamping device using an electric motor as a drive source.
[0002]
[Problems to be solved by the invention]
A conventional electric saddle molding machine employs a toggle mechanism as a mold clamping device. The toggle mechanism is provided in the machine base, and the toggle link is expanded and contracted by a ball screw shaft that rotates the toggle mechanism by an electric motor and a ball nut member that converts the rotation into a linear motion. The movable platen on the connected machine base is moved up and down with respect to the upper surface of the machine base so that the mold can be clamped.
[0003]
Most vertical molding machines are used for insert molding, but the toggle mechanism has tie bars on the four sides between the machine base and the movable platen, so the side inserts are limited and the lower mold is placed. There is a restriction that the diameter of the turntable is also limited.
[0004]
As a means of solving the restriction by this tie bar, in a vertical molding machine using hydraulic pressure as a drive source, a direct pressure type is adopted as a mold clamping mechanism, and a pair of left and right mold clamping cylinders are provided vertically on the upper part of the movable platen. The piston rod of the tightening cylinder is connected to the movable platen, and the three sides on the machine plate are opened except for the tie bar between the machine platen and the movable platen.
[0005]
Even if the tie bar is omitted, in the clamping cylinder, the piston rod is supported vertically at the lower end and the upper end of the vertical hydraulic cylinder. Even if there is no support of the tie bar, it always moves up and down without swinging, so stable mold clamping accuracy is maintained.
[0006]
Therefore, even when an electric motor is used as the drive source, the toggle mechanism is changed to a direct pressure type that directly presses with the ball screw shaft, and is provided at the upper part of the movable plate as in the case of hydraulic pressure, and the ball screw shaft is connected to the movable plate. Although it is conceivable to omit the tie bar, in the ball screw shaft, there is a clearance around the ball interposed in the threaded portion with the ball nut member, and this clearance causes the ball screw shaft to shake during operation. Although this runout is minute, it affects the mold clamping accuracy, and it is necessary to prevent this runout.
[0007]
Accordingly, an object of the present invention is to adopt a direct pressure type as the mold clamping mechanism and provide a movable platen on the upper part, and even if the tie bar is omitted by connecting the mold clamping ball screw shaft and the movable plate, the mold clamping ball screw shaft It is an object of the present invention to provide a new electric direct pressure vertical molding machine capable of restraining the deflection and thereby moving the movable plate vertically up and down to always maintain stable mold clamping accuracy.
[0008]
[Means for Solving the Problems]
According to the above-mentioned object, the present invention is characterized in that a support is erected on one side of a machine base, an injection device is provided at the upper part of the front facing the machine base, and an electric direct pressure type mold clamping device is provided at the lower part together with a movable platen. An installed vertical molding machine,
A pair of housings provided opposite to the lower side of the front surface of the support; a mold clamping ball nut member with a pulley provided vertically in each housing; and a mold clamping ball nut member; A pair of left and right clamping ball screw shafts that are screwed in and inserted into the upper and lower sides of each housing, a clamping electric motor that is mounted upward on the back of the support, and the clamping electric motor side and both pulleys. The mold clamping drive belt and a guide rail vertically provided vertically on the front surface of the support below the housing, and the movable plate is horizontally supported by the guide rail on the front surface of the support, The ball screw shaft is connected.
[0009]
Further, according to the present invention, a screw shaft for nozzle touch is erected on the movable platen, and a nut member with a pulley provided on the injection device side is screwed to the screw shaft to connect the movable platen and the injection device. A guide rail is vertically provided vertically on the front upper portion of the support, and the injection device is supported on the support through the guide rail so as to be movable up and down.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, reference numeral 1 denotes a support body having a plate-like frame standing on one side of the machine base 2. An electric direct pressure type mold clamping device 3 is movable on the lower part of the front plate 11 facing the machine base 2 of the support body 1. 4, and an injection device 5 is disposed downward on a front plate 11 above the mold clamping device 3. Reference numeral 6 denotes a screw shaft for nozzle touch provided across the movable platen 4 and the injection device 5.
[0011]
A pair of arms 12 are provided on both sides of the lower portion of the front plate 11, and a disk-shaped housing 31 of the mold clamping device 3 is horizontally attached to the tip thereof. In addition, a pair of linear guide rails 7 of the movable platen 4 having a nozzle hole in the center are vertically arranged on the front plate 11 below both housings 31.
[0012]
Inside each housing 31, a clamping ball nut member 33 having a pulley 32 connected to the upper end is vertically provided by a bearing so as to be rotatable, and is screwed into the clamping ball nut member 33 to clamp the mold. A ball screw shaft 34 extends through each housing 31 so as to be movable up and down.
[0013]
On the back of the front plate 11, a mold clamping electric motor 35 by an electric servomotor is mounted upward, and the mold extends over the pulley 35a of the mold clamping electric motor 35 and both pulleys 32 on the mold clamping ball nut member side. The tightening drive belt 36 is wound. As a result, the rotation by the mold clamping electric motor 35 is transmitted to both mold clamping ball nut members 33, and the rotation of the mold clamping ball nut member 33 is converted into the linear motion of the mold clamping ball screw shaft 34. 34 constitutes the mold clamping device 3 that moves up and down.
[0014]
The movable plate is supported horizontally by the front end of the support 1 by fitting the linear guide rail 7 with a sliding member 7a at the rear end at the lower end of the mold clamping ball screw shaft 34 of the mold clamping device 3. 4 is connected. On the lower surface of the movable board 4, a fixed mold 8a on the upper surface of the machine base and a movable mold 8b for closing the mold are attached.
In the example shown in the figure, the fixed mold 8a is installed on the upper surface of the mold placing plate 9 provided on the upper surface of the machine base 2, but the mold placing plate 9 may be a rotating plate.
[0015]
The injection device 5 connects the lower plate 52a and the upper plate 52b, which are connected to the base end portion of the heating cylinder 51, with a connection interval by a connecting rod 52c, and the injection plate 53 is movable to the rod 52c. A drive unit that is integrally formed by being inserted is provided. A base shaft of an injection screw 54 penetrating the lower plate 52a is rotatably attached to the injection plate 53, and a measuring pulley 55 is attached to the base portion thereof.
[0016]
The upper plate 52b is integrally formed with a bearing member 57 that rotatably supports the shaft portion of the injection ball screw shaft 56, and a pulley 56a is attached to a shaft end protruding on the bearing member. An injection drive belt 56b is wound around the pulley 56a and a pulley 58a at the drive shaft end of the injection electric motor 58 by an electric servomotor.
[0017]
The screw shaft of the injection ball screw shaft 56 protrudes long downward from the bearing member 57, is screwed with a ball nut member 59 at the upper portion of the injection plate located at the lower end thereof, and the ball nut member is rotated by rotation of the screw shaft at a fixed position. 59, the injection plate 55 is moved downward with the connecting rod 52c as a guide, and upward depending on the rotational direction, and has a normal structure for injecting or metering resin.
[0018]
The injection device 5 is adapted to move up and down by fitting a sliding member 10a provided on upper and lower plates 52a and 52b to a pair of left and right guide rails 10 arranged vertically vertically above the front plate 11. It is supported freely.
[0019]
The screw shaft 6 for nozzle touch has a lower end fixed to a pedestal 41 projecting from the center of the upper surface of the movable platen 4, and is erected up to the upper side of the lower plate 52a of the injection device 5, and its upper end is The nut member 61 is rotatably engaged with the lower plate 52a. A pulley 61 a is attached to the upper end of the nut member 61. A transmission belt is wound around the pulley 61a and the pulley 62a of the nozzle touch gear motor 62 fixed on the lower plate 52a, and the rotation of the gear motor 62 is transmitted to the nut member 61, whereby the screw The injection device 5 moves up and down with respect to the movable platen 4 with the shaft 6 as a guide, and nozzle touches a gate (not shown) of the movable mold 8b.
[0020]
In the above configuration, since the mold clamping device using the electric motor as a drive source is installed at the upper part of the machine base, the machine base height can be set at a work position suitable for insert molding, so that the efficiency is improved. In addition, since the tie bar that supports the movable plate is not required, the three sides on the machine base can be opened, and the vertical movement of the movable plate is supported with a guide rail on the support standing on the machine base. Even if it is an electric direct pressure type that is connected to the mold clamping ball screw shaft and performs mold clamping, it is possible to constrain the deflection of the ball screw shaft, thereby preventing side shake and moving the movable plate up and down vertically, It becomes possible to always maintain stable mold clamping accuracy. Furthermore, the movable platen and the injection device are connected by a screw shaft for nozzle touch, and the vertical movement of the movable platen by the clamping ball screw shaft and the vertical movement of the injection device by the screw shaft for nozzle touch can be performed in parallel. Since it did in this way, it becomes possible to perform the nozzle touch after mold clamping from mold closing at high speed. In addition, since the injection device is supported by the support body, lateral shaking during vertical movement of the injection device is prevented, and damage to the nozzle tip due to misalignment is also prevented.
[Brief description of the drawings]
FIG. 1 is a front view of an electric direct pressure vertical molding machine according to the present invention when the mold is opened.
FIG. 2 is a side view in which a support is vertically cut during mold clamping.
FIG. 3 is a sectional view taken along line AA in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support body 2 Machine stand 3 Clamping device 4 Movable platen 5 Injection device 6 Screw shaft for nozzle touch 7 Linear guide rail 7a of movable plate Slide member 10 Linear guide rail 10a of injection device Slide member 11 Front plate 12 Arm 31 Housing 32 Pulley 33 Mold clamping ball nut member 34 Mold clamping ball screw shaft 35 Mold clamping electric motor 36 Mold clamping drive belt 52a Injection device lower plate 52b Injection device upper plate 61 Nozzle touch nut member 61a Nut member pulley 62 Gear motor for nozzle touch

Claims (3)

A vertical molding machine in which a support is erected on one side of the machine base, an injection device is provided at the top of the front facing the machine base, and an electric direct pressure type clamping device is provided at the bottom together with a movable platen. Because
A pair of housings provided on the opposite sides of the lower surface of the support body,
A mold clamping ball nut member with a pulley provided vertically in each housing for rotation,
A pair of left and right mold clamping ball screw shafts threadedly engaged with the mold clamping ball nut members and inserted through the top and bottom of each housing;
A mold clamping electric motor mounted upward on the back of the support;
A clamping drive belt wound around the clamping electric motor side and both pulleys;
It consists of a guide rail vertically installed vertically on the front of the support on the lower side of the housing,
An electric direct pressure vertical molding machine characterized in that the movable plate is horizontally supported by the guide rail in front of a support and the movable plate and the clamping ball screw shaft are connected. A nozzle shaft for nozzle touch is erected on the movable plate, a nut member with a pulley provided on the injection device side is screwed to the screw shaft, and the movable plate and the injection device are connected. The electric direct pressure vertical molding machine according to claim 1. 3. The electric direct drive according to claim 1 or 2, wherein a guide rail is vertically provided vertically at an upper front portion of the support, and the injection device is supported by the support so as to be movable up and down via the guide rail. Pressure type vertical molding machine.

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