JPS633728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-tube injection molding machine having a large number of pressure-resistant cylinders, and particularly relates to a mold section, a plurality of pressure-resistant cylinders maintained at various temperatures, and a mold section that is inserted into the pressure-resistant cylinders. A drive unit that drives the screw screw, a pressure cylinder support plate that supports the pressure cylinder and allows desired pressure cylinders to move forward and backward sequentially from the upper surface of the mold part and directly below the drive unit, and the pressure cylinder support. A multi-tube type comprising an elevating means for moving a plate up and down to bring the nozzle of the pressure-resistant cylinder into contact with and away from the mold part, and a joint means for removably connecting the drive part to the screw. It is related to injection molding machines.

Conventionally, there have been various problems when injecting different types of molded products. That is, when changing the color of a molded product, it is necessary to clean the inside of the pressure cylinder, and for this purpose, 10 to 20 shots of resin of a new color are injected for cleaning, which saves time. The drawbacks were that losses were severe and resin was wasted.

Furthermore, when changing the type of resin, it is necessary to change not only the above-mentioned cleaning shot but also the molding conditions. Among the molding conditions, temperature is the biggest problem, and the temperature is changed by changing the setting value of the controller, but the pressure cylinder has a large heat capacity, so it is difficult to keep the temperature of the cylinder at the desired temperature. Since a long response time is required to reach the set value, time loss is unavoidable, and on top of that, there is the disadvantage that an even longer time loss is involved until the control system reaches a stable state. It was hot.

In addition, since changing the temperature conditions requires the consumption of thermal energy, there is also the drawback that this also involves energy loss.

In view of the problems in the molding operation of different types of molded products in the injection molding machine based on the above-mentioned conventional technology, the present invention provides a plurality of pressure-resistant parts that are removable from the mold part and that can move forward and backward at various preset temperatures. The present invention aims to provide an excellent multi-tube injection molding machine that eliminates the above-mentioned drawbacks and can injection-mold various molded products extremely efficiently by having a structure including a cylinder.

In accordance with the above object, the present invention has a structure in which a plurality of pressure cylinders are filled with resins of different colors during injection molding work of various molded products, or the pressure cylinders are filled with resins of different colors depending on the type of resin. Keep it at a constant temperature, and place the desired pressure-resistant cylinder among these pressure-resistant cylinders on the top surface of the mold part.
The drive shaft of the drive unit and the screw inserted in the pressure cylinder are removably connected via a joint, and the pressure cylinder is moved up and down. The gist of the present invention is to make it possible to efficiently mold various molded products by bringing the nozzle at the tip of the cylinder into contact with and away from the mold part.

Next, embodiments of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a mold section, which consists of an upper mold 3 attached to a fixed mold plate 2, a lower mold 5 attached to a movable mold plate 4, and a mold clamping cylinder 6. 7
a is a pressure-resistant cylinder, a nozzle 8a is attached to the tip, and a hopper 9a is installed at the top.Furthermore, a screw 10a is inserted into the cylinder so as to be rotatable and movable up and down. It stands out.
A driven side joint 11 is provided at the upper end of the screw 10a.
a is fixedly installed. The pressure cylinder 7a has a temperature controller 13a connected to a temperature setting device 12a.
The temperature is maintained at a predetermined temperature by 7b,7
Reference numerals c and 7d designate pressure cylinders having the same structure as the pressure cylinder 7a, each of which is maintained at its own preset temperature.

Each of the pressure cylinders 7a to 7d is mounted and supported on a pressure cylinder receiving plate 14, and the pressure cylinder receiving plate 14 is mounted on a pedestal 16.
It is supported by a cylinder 15 etc. on the upper part so as to be able to slide left and right.

Further, the pedestal 16 is supported by a nozzle elevating cylinder 17 so as to be able to move up and down, and the pressure cylinder receiving plate 1
4, each pressure cylinder 7a to 7d is moved up and down.

Reference numeral 18 denotes a drive unit, which includes a sliding bearing member 2 supported so as to be slidable up and down along a guide column 19, an oil motor 21 fixed to the upper surface of the member, and an oil motor 21 extending downward through the member. The rotary drive shaft 22 of the oil motor, a casing 23 fixed to the upper surface of the sliding bearing member 20 so as to cover the oil motor 21, and an injection drive shaft 24 fixed to the top of the casing.

The guide column 19 is installed on a base (not shown), and the injection drive shaft 24 is connected to an injection drive source (not shown).
For example, it is connected to the piston rod of a hydraulic piston.

Furthermore, at the tip of the rotary drive shaft 22 of the drive unit,
Driven side joint 1 of the screws 10a to 10d
Drive side joint 25 detachable from 1a to 11d
is fixedly installed, and the driven side joints 11a to 1
1d and the drive side joint 25 form a joint means.

In the above configuration, the hoppers 9a to 9d of each of the pressure cylinders 7a to 7d are filled with resin of a desired color and material, and the pressure cylinders are filled with temperature controllers 13a to 13.
d, the temperature is maintained at a predetermined level.

Such a temperature controller uses a signal representing the difference between a signal supplied from a temperature detection element embedded in the pressure cylinders 7a to 7d and a signal corresponding to the set temperature supplied from the temperature setters 12a to 12d. That is, in response to an error signal, power is supplied to the heaters of the pressure cylinders 7a to 7d to heat them until the error signal disappears, and this is often used in conventional injection molding machines.

Therefore, when injection molding is performed using the first pressure tube 7a, when the pedestal 16 is pulled down by the nozzle lifting cylinder 17, the pressure tube receiving plate 14 is also pulled down, and the pressure tube 7a is lifted together with the pressure tubes 7a to 7d. The nozzle 8a at the tip comes into contact with the upper mold 3 of the mold part 1. Then, the sliding bearing member 20 is attached to the guide column 1.
9, the rotary drive shaft 22 is lowered, and the drive side joint 25 at the tip is connected to the driven side joint 11a at the upper end of the screw 10a of the pressure cylinder 7a. A desired molded product is obtained by injecting a predetermined resin filled in the hopper 9a into the molds 3 and 5 by the rotational action of the injection drive shaft 24 and the extrusion action of the injection drive shaft 24.

Next, when forming a different type of molded product, injection molding may be performed using a pressure cylinder maintained at a predetermined temperature, for example, the second pressure cylinder 7b. The rotary drive shaft 22 is pulled up together with the bearing member 20 to remove the joints 11a and 25, and the nozzle lifting cylinder 17 pushes up the pedestal 16 to move the nozzle 8a of the pressure cylinder 7a through the pressure cylinder support plate 14. It is separated from the mold part 1. Then, the pressure cylinder receiving plate 1 is moved by the cylinder 15.
4 horizontally to move the second pressure cylinder 7b into the mold part 1.
and position it directly below the drive unit 18. The operation of the subsequent injection molding process is similar to that described above.

By repeating these operations, the injection molding operation is performed on all the pressure cylinders kept at various temperatures, and the desired type of molded product is obtained.

Note that the number of pressure-resistant cylinders is not limited to the above embodiment, and it is of course possible to provide pressure-resistant cylinders corresponding to the number of desired molded products.

Further, the means for vertically moving the rotary drive shaft 22 together with the sliding bearing member 20 for attaching and detaching the joints 25, 11a to 11d may be such that the entire drive unit is moved vertically by another drive source, or , the injection drive shaft 24 may be moved up and down using an injection drive source.

Furthermore, although the pressure-resistant cylinder receiving plate has been described as being able to move back and forth in the horizontal direction, it may be rotatably supported as a rotary table.

As described above, according to the present invention, in an injection molding machine for obtaining many types of molded products, a plurality of pressure-resistant cylinders maintained at a specific temperature, a plurality of pressure-resistant cylinders are supported, and a desired pressure-resistant cylinder is formed. A pressure cylinder receiving plate that can move forward and backward relative to the upper surface of the mold part and directly below the drive unit, means for vertically moving the pressure cylinder receiving plate 14, a screw inserted into the pressure cylinder, and rotation of the drive unit. By including a coupling means for removably connecting the drive shaft, when moldings of different colors and materials are to be molded, resins of different colors and materials are filled into each pressure cylinder,
All you have to do is move the desired pressure cylinder to the top of the mold part and directly below the drive part and inject it, and the cleaning inside the pressure cylinder, which was required in the past, can be completely omitted, eliminating wasted time and materials due to cleaning shots. This has the excellent effect of allowing extremely efficient injection molding work.

In addition, since each pressure tube is pre-maintained at an appropriate temperature suited to the resin material, there is no need to change the settings of the control system to bring each pressure tube to the optimum temperature, streamlining work. effective.

Furthermore, since there is no response time until the pressure cylinder reaches the optimum temperature, there is an effect that time loss and energy loss are reduced.

Furthermore, by increasing the number of pressure-resistant cylinders, it is possible to easily accommodate the number of desired molded products, and there is an advantage that many types of molded products can be molded extremely efficiently.

[Brief explanation of the drawing]

The figure is a schematic explanatory diagram showing an embodiment of the present invention. 1...Mold part, 7a-7d...Pressure cylinder, 8a-
8d...Nozzle, 9a-9d...Hopper, 10
a~10d... Screw, 11a~11d...
Driven side joint, 12a...Temperature setting device, 13a...
...Temperature controller, 14...Pressure cylinder support plate, 16...Band, 18...Drive section, 19...Guiding column, 20...
Sliding bearing member, 21... Oil motor, 22...
Rotation drive shaft, 24... Injection drive shaft, 25... Drive side joint.

Claims (1)

[Scope of Claims] 1. A mold part 1, a plurality of pressure cylinders 7a to 7d which are provided with nozzles 8a to 8d that can come into contact with the mold part and are maintained at a specific temperature, and the pressure cylinders. A drive unit 18 that rotates and moves up and down the screws 10a to 10d inserted into the mold part 1, and a drive unit 18 that supports the pressure cylinders and sequentially moves desired pressure cylinders 7a to 7d onto the upper surface of the mold part 1 and directly below the drive unit 18. A pressure cylinder receiving plate 14 that can move forward and backward relative to the pressure cylinders 7a to 7 by moving the receiving plate up and down.
elevating means 17 for bringing the nozzles 8a to 8d of d into contact with and separating from the mold part 1, and joint means 25, 11a to 17 for removably connecting the rotational drive shaft 22 of the drive part 18 to the screws 10a to 10d. A multi-tube injection molding machine equipped with 11d. 2. The multi-tube injection molding machine according to claim 1, wherein the pressure-resistant cylinder receiving plate 14 is supported so as to be movable in a horizontal direction. 3. The multi-tube injection molding machine according to claim 1, wherein the pressure-resistant cylinder receiving plate 14 is rotatably supported.