JPH06246772A - Vertical injection molding machine - Google Patents

Abstract

PURPOSE:To miniaturize the whole shape by especially providing an injection nozzle and a mold in parallel. CONSTITUTION:A vertical injection molding machine is equipped with the injection nozzle 8 positioned at the center of molds 10, 12 and communicating with an injection cylinder 21 through a resin passage 9 and the injection cylinder 21 suspended from the fixing plate 15 fixed to a frame 1 through an elastomer 20 to communicate with the resin passage 9 and, since the injection cylinder 21 is arranged at the lateral position of the molds 10, 12, the injection molding machine is reduced in height and miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection molding apparatus, and more particularly to a new improvement for arranging an injection nozzle in parallel with a mold to reduce the overall shape.

[0002]

2. Description of the Related Art As a vertical injection molding apparatus of this type which has been conventionally used, a structure shown in FIG. 3 is generally adopted. That is, what is denoted by reference numeral 1 in FIG. 3 is a frame, and on this frame 1, a pair of movable plates 11 and 11A are vertically movable via a driving body 16 such as a hydraulic cylinder and four tie bars 14. The mold 10 is provided on the fixed platen 15 on the frame 1, and the mold 12 is provided on the lower surface of the movable platen 11. A lower end of a piston rod 7 of a pair of cylinders 4 is fixed on the movable plate 11, and a nozzle moving frame 5 connected to the cylinder 4 is provided with an injection cylinder 21 having an injection nozzle 8.

Next, the operation will be described. First, when the movable plates 11 and 11A are lowered via the hydraulic device 2 and the driving body 16, the molds 10 and 12 are closed and clamped, and the operation of the cylinder 4 causes the injection nozzle 8 to move the mold 12 to the mold 12.
The mold is touched. In this state, the molding material can be injected from the injection cylinder 21 into the cavity 13 of the mold 12 for molding.

[0004]

Since the conventional vertical injection molding apparatus is configured as described above, the following problems exist. That is, since the injection cylinder is disposed above or below the mold, the height of the apparatus becomes high, and it is impossible to meet the demand for reducing the height and downsizing.

The present invention has been made to solve the above problems, and in particular, it is a vertical type in which an injection nozzle is installed in parallel with a die and the height is reduced to achieve the miniaturization of the entire shape. It is an object to provide an injection molding device.

[0006]

A vertical injection molding apparatus according to the present invention is designed to inject a molding material from an injection cylinder into a cavity formed between a pair of upper and lower molds. In the mold injection molding apparatus, the injection cylinder is arranged at a side position of the mold with its own weight offset by an elastic body, and an injection nozzle connected to the injection cylinder via a resin passage is provided. This is a structure in which it is vertically movable around the center of the mold.

More specifically, the nozzle moving frame connected to the lower portion of the resin passage, the plurality of nozzle guides provided at the lower portion of the nozzle moving frame, and the frame provided below the nozzle moving frame. A guide rod which is provided on the nozzle and cooperates with the nozzle guide, a cylinder provided between the nozzle moving frame and the frame, a rod provided on the injection cylinder, a fixed plate connected to the frame, and the rod. And a guide for a cylinder that cooperates with the stationary platen.

More specifically, the extruder is connected to the injection cylinder through a bendable connecting means.

More specifically, the injection cylinder is arranged vertically.

More specifically, the injection cylinder is arranged horizontally.

More specifically, the injection cylinder is a screw injection cylinder having a hopper for supplying pellet raw material.

[0012]

In the vertical injection molding apparatus according to the present invention, the molding material injected from the injection cylinder is injected into the cavity of the mold from the injection nozzle located at the center of the mold through the resin passage. Due to the allowance of the vertical movement guide portion of the cylinder, the thermal expansion of the resin passage is released to the injection cylinder side, so that the position change of the injection nozzle can be prevented. Also, by supporting a particularly heavy injection cylinder with a balance spring, the weight balance of the whole can be maintained.In addition to each nozzle guide under the nozzle, a cylinder guide is also provided above the injection cylinder for accurate injection. The cylinder, the injection nozzle, and the nozzle movement frame can be moved in parallel, so that a smooth nozzle touch operation and the straightness of the injection nozzle and the reproducibility of the position are ensured. Further, the injection cylinder is located at a side position of the mold, and a hydraulic device or the like can be arranged in a space below the injection nozzle (on the nozzle axis), so that the height of the entire device can be reduced and the size can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a vertical injection molding apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing a vertical injection molding apparatus according to the present invention, and FIG.
3 is a sectional view taken along line AA of FIG.

In FIG. 1, a reference numeral 1 is a frame 1 as a base, a hydraulic device 2 is provided below the frame 1, and four guide rods are provided on the frame 1. 3 (only two are shown) and two hydraulic type cylinders 4 are provided.

Four cylindrical nozzle guides 6 provided in the lower part of the nozzle moving frame 5 located above the frame 1 are slidably fitted on the outer circumference of each of the guide bars 3. A piston rod 7 provided below the nozzle moving frame 5 is configured to move the nozzle moving frame 5 up and down in combination with the cylinder 4.

A resin passage 9 having an injection nozzle 8 on the nozzle moving frame 5 via a heat insulating plate (not shown).
Is detachably provided via a plurality of bolts 9a and 9b, and the injection nozzle 8 is located at the center of the die of the fixed side die 10 arranged above the nozzle moving frame 5 and A mold 12 on the movable side provided on the movable plate 11 is disposed above, and a cavity 13 is formed between the molds 10 and 12. The die 10 is fixedly provided on a base 26 which is provided on the frame 1 and has an inverted U-shape.

The movable plate 11 is provided on a plurality of tie bars 14 fixed on the frame 1 so as to be vertically movable,
A fixed platen 15 is fixed to the upper portion of each tie bar 14. A drive rod 17 of a driving body 16 composed of a hydraulic cylinder, a motor or the like provided on the fixed platen 15 is connected to the movable platen 11, and the movable platen 11 moves up and down to open and close the molds 10 and 12 and clamp the mold. Is configured to take place.

An extension member 18 connected to the fixed plate 15
A cylindrical cylinder guide 19 is provided on the through hole 18a, and the resin is provided below the extension member 18 via an elastic body 20 made of a spring (an elastic material other than the spring may be used). An injection cylinder 21 connected to the passage 9 is provided so as to be suspended while canceling its own weight.

A rod 21A integrally erected on the upper part of the injection cylinder 21 is slidably provided in the cylinder guide 19 via a bearing 19a, and the injection cylinder 21 is provided below the injection cylinder 21. Injection hole 21a
A valve 22 is provided in communication with the valve 22.

The valve 22 is composed of a well-known rotary type three-way valve, and is connected to the extruder 24 via a connecting means 23 having a bendable elastic hose or joint. It is connected. The nozzle moving frame 5 is provided with a shut-off valve 25 and a shut-off valve cylinder 25A. The shut-off valve 25 is communicated with the resin passage 9 communicating with the injection nozzle 8 and a resin communicating with the injection nozzle 8. It is configured to open and close the passage 9.

Next, the operation will be described. First, the shut-off valve 25 is closed, the valve 22 is opened, and the extruder 2 is closed.
When the molten resin is supplied from 4 to the injection cylinder 21, the piston 21b in the injection cylinder 21 rises, and the molten resin that is the molding material is stored. In addition, the movable platen 11 is pushed down via the driving body 16 and the driving rod 17, and the molds 10, 1
The cavity 13 is formed by performing mold closing and mold clamping of No. 2, and the nozzle moving frame 5 is formed through each cylinder 4.
At the same time, the injection nozzle 8 is raised to bring the mold 10 into a mold touch state, and the injection preparation is completed. When the shut-off valve 25 is opened, the valve 22 is closed and the piston 21b of the injection cylinder 21 is operated in the above-described state, the molten resin flows from the injection nozzle 8 into the cavity 13 through the resin passage 9. It is supplied and molded.

Further, the thermal expansion of the resin passage 9 is released to the side of the injection cylinder 21 having a weak fixing force to prevent the position change of the injection nozzle 8 and prevent the resin leakage between the injection nozzle 8 and the mold 10. Further, the heavy weight injection cylinder 21 is supported by the balancing elastic body 20 to maintain the weight balance,
The four nozzle guides 6 and the guide rods 3 located below the injection nozzle 8 also allow the injection cylinder 21 to perform accurate parallel movement in the up-and-down direction. The reproducibility of sex and position is secured. The injection cylinder 21 absorbs the displacement due to the thermal expansion of the resin passage 9 in the margins of the guides 6 and 19 described above, and the guides 6 and 19 can be provided with a required margin if necessary.

The bolt 9b located below the injection cylinder 21 may be a slide guide which is easily moved by thermal deformation, and the injection cylinder 21 may be horizontally arranged with its axis being horizontal. Further, the injection cylinder 21 may be an injection cylinder with a screw for supplying the pellet raw material to the hopper without connecting to the extruder 24.

[0024]

The present invention is constructed as described above, and the injection cylinder is arranged at a lateral position of the main body having the mold, and the nozzle guide and the guide rod are used for the parallel movement in the vertical direction.
Since it has an elastic body for weight balance, the movement of the injection nozzle can be performed accurately, the position of the injection nozzle does not shift due to thermal deformation with respect to the mold, and resin leakage can be prevented. it can. In addition, it is possible to obtain a small configuration in which the height of the vertical injection molding device is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a vertical injection molding apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view showing a conventional vertical injection molding apparatus.

[Explanation of symbols]

 1 Frame 3 Guide Rod 4 Cylinder 5 Nozzle Moving Frame 6 Nozzle Guide 8 Injection Nozzle 9 Resin Passage 10, 12 Mold 13 Cavity 15 Fixing Plate 19 Cylinder Guide 20 Elastic Body 21 Injection Cylinder 21A Rod 23 Connecting Means 24 Extruder

Claims (6)

[Claims] 1. Vertical injection molding in which a molding material is injected from an injection cylinder (21) into a cavity (13) formed between a pair of upper and lower molds (10, 12). In the device, the injection cylinder (21) is arranged at a position lateral to the mold (10, 12) with its own weight being offset via an elastic body (20), and the injection cylinder (21) is provided with a resin. A vertical injection molding apparatus characterized in that an injection nozzle (8) connected through a passage (9) is provided in the mold center of the mold (10, 12) so as to be vertically movable. 2. A nozzle moving frame (5) connected to a lower portion of the resin passage (9), a plurality of nozzle guides (6) provided at a lower portion of the nozzle moving frame (5), and the nozzle moving frame. A guide rod (3) provided on the frame (1) provided below the frame (5) and cooperating with the nozzle guide (6).
A cylinder (4) provided between the nozzle moving frame (5) and the frame (1), a rod (21A) provided on the injection cylinder (21), and connected to the frame (1). The vertical injection molding according to claim 1, further comprising a fixed plate (15) and a cylinder guide (19) that cooperates with the rod (21A) and is connected to the fixed plate (15). apparatus. 3. The vertical injection according to claim 1, further comprising an extruder (24) connected to the injection cylinder (21) through a bendable connecting means (23). Molding equipment. 4. The vertical injection molding apparatus according to claim 3, wherein the injection cylinder (21) is arranged in a vertical direction. 5. The vertical injection molding apparatus according to claim 3, wherein the injection cylinder (21) is arranged in a horizontal direction. 6. The vertical injection molding apparatus according to claim 1, wherein the injection cylinder (21) is an injection cylinder with a screw having a hopper for supplying a pellet raw material.