JPH0742675Y2 - Injection molding machine - Google Patents

Description

The present invention relates to an injection molding machine, and more particularly to a vertical injection molding machine that opens and closes a mold in a vertical direction.

(Prior Art) Conventionally, an injection molding machine of this type is known, for example, as shown in FIG.

In FIG. 3, an upper die (not shown) is attached to the lower surface side of the upper die plate 1, and the upper die is attached to a lower die (not shown) attached to a lower die plate below. Configure an injection mold. The injection nozzle 2 provided above the upper die plate 1 is a nozzle support plate 3
A fluid pressure actuator 4 for raising and lowering the injection nozzle 2 is provided between the nozzle support plate 3 and the upper die plate 1. A fluid pressure from a supply source (not shown) is introduced into the fluid pressure actuator 4 through a steel pipe 5 arranged near the upper die plate 1. On the other hand, the upper die plate 1 is provided with a fluid pressure actuator 6 for ejection, and the fluid pressure actuator 6 is supplied with fluid from a supply source through a steel pipe 7 arranged in the vicinity of the upper die plate 1 like the steel pipe 5. Pressure is introduced.

(Problems to be solved by the invention) However, in the conventional injection molding machine, there is a problem that the work efficiency of the maintenance work and the preparatory work before and after the molding and the finishing work is lowered due to the following reasons. there were.

That is, since the fluid pressure is introduced into the fluid pressure actuators 4 and 6 through the steel pipes 5 and 7, fluid leakage from the pipe joints of the steel pipes 5 and 7 is likely to occur frequently. Since the leaked liquid enters the mold through the upper die plate 1 etc. and adversely affects the molded product, it is necessary to frequently check the pipe joint for leaks.
Further, when disassembling and assembling the molding machine, it takes a long time to attach and detach the steel pipes 5 and 7, and the work efficiency of the maintenance work decreases.

Also, in injection molding, it is necessary to perform a purging operation for ejecting unnecessary resin from the injection nozzle 2 as a preparation before and after molding and as an end operation. For this reason, if the steel pipes 5 and 7 are provided, the space around the upper die plate 1 is narrowed, the workability is deteriorated, and the work efficiency of the purging work is reduced.

(Object of the Invention) Therefore, the present invention aims to improve the efficiency of maintenance work, preparation before and after molding, and finishing work by forming a fluid passage in the upper die plate for introducing fluid pressure to the fluid pressure actuator. Has an aim.

(Means for Solving the Problems) The injection molding machine according to the present invention achieves the above object.
An upper mold and a lower mold that are opened and closed in the vertical direction, upper and lower die plates that support the upper mold and the lower mold, and an injection nozzle that moves up and down to approach and separate from the upper mold. An injection molding machine equipped with a plurality of fluid pressure actuators that are mounted on the upper die plate so as to move up and down at least the injection nozzle, and that operate according to the fluid pressure from the supply source introduced into the internal pressure chamber, A fluid passage communicating with a pressure chamber of the fluid pressure actuator is formed in the upper die plate, and a fluid pressure is introduced from a supply source to the fluid pressure actuator through the fluid passage. is there.

(Operation) In the present invention, since the fluid passage is formed in the upper die plate, the fluid for operating the actuator is supplied through the fluid passage in the die plate, so that a pipe joint or the like is unnecessary. Liquid leakage from the fluid passage is prevented, and sufficient space is secured around the upper die plate. Therefore, maintenance work and preparation before and after molding,
It is possible to improve the work efficiency of the finishing work.

(Example) Hereinafter, the present invention will be described with reference to the drawings.

1 and 2 are views showing an embodiment of an injection molding machine according to the present invention.

First, the configuration will be described.

In FIGS. 1 and 2, 11 is an upper mold, 12 is a lower mold,
The upper die 11 and the lower die 12 are opened vertically. The upper die 11 is supported by the upper die plate 13 on the upper side, and the lower die 12
Is supported by the lower die plate 14 on the lower side. Reference numeral 15 is an injection nozzle, and the injection nozzle 15 is supported by a nozzle support plate 16 provided above the upper die plate 13, and a plurality of fluid pressure actuators 17, 18 are attached to the upper die plate 13. . The fluid pressure actuator 17 is a nozzle support plate.
The fluid pressure actuator 18 is an actuator that is connected to 16 and moves up and down the injection nozzle 15, and the fluid pressure actuator 18 is an ejector actuator. A fluid pressure is supplied from a supply source 19 to the pressure chambers inside the fluid pressure actuators 17, 18. Therefore, the fluid pressure actuators 17 and 18 are mounted on the upper die plate 13 so as to raise and lower at least the injection nozzle 15, and operate by the fluid pressure from the supply source 19 introduced into the internal pressure chamber.

Here, the fluid pressure actuator is
Fluid passages 20 and 21 are formed so as to communicate with the respective pressure chambers 17 and 18, and the fluid pressure from the supply source 19 is introduced into the respective pressure chambers of the fluid pressure actuators 17 and 18 through the fluid passages 20 and 21. More specifically, the fluid passages 20 and 21 are supplied to the supply source 19 through a fluid pressure control unit 22 provided on the upper die plate 13.
And is adapted to appropriately introduce a predetermined fluid pressure into the fluid passages 20 and 21 under the control of the fluid pressure control unit 22.

According to the above-mentioned configuration, since the steel pipe and the pipe joint which have been conventionally used are unnecessary, it is possible to prevent liquid leakage from the fluid passages 20 and 21, and the leaked liquid adversely affects the molded product. Such a problem can be solved.

In addition, the prevention of liquid leakage from the fluid passages 20 and 21 makes it unnecessary to inspect liquid leakage, and disassembles the molding machine.
At the time of assembling, it is possible to eliminate the work of attaching and detaching the steel pipe, which was conventionally necessary. Therefore, the work efficiency of the maintenance work can be improved.

Further, since the steel pipe used conventionally can be eliminated, a sufficient space can be secured around the upper die plate 13 and the purging work can be facilitated. Therefore, it is possible to improve the work efficiency of the preparation work before and after the molding and the finishing work.

(Effect) According to the present invention, since the fluid passage for introducing the fluid pressure to the fluid pressure actuator is formed in the upper die plate, the steel pipe, the pipe joint, etc. are unnecessary, and the liquid leakage from the fluid passage is eliminated. Can be prevented, and a sufficient space can be secured around the upper die plate. Therefore, the work efficiency of maintenance work, preparation before and after molding, and finishing work can be improved.

[Brief description of drawings]

1 and 2 are views showing an embodiment of an injection molding machine according to the present invention. FIG. 1 is a front view of the same, FIG. 2 is an enlarged perspective view of an essential part thereof, and FIG. 3 is a conventional injection molding machine. It is a principal part expansion perspective view of a machine. 11 …… Upper die, 12 …… Lower die, 13 …… Upper die plate (die plate), 14 …… Lower die plate (die plate), 15 …… Injection nozzle, 17,18 …… Fluid pressure actuator , 19 ...... Supply source, 20, 21 ...... Fluid passage.

Claims (1)

[Scope of utility model registration request] 1. An upper die and a lower die that are opened and closed in the vertical direction, upper and lower die plates that support the upper die and the lower die, and so as to approach and separate from the upper die. Injection molding including an ascending / descending injection nozzle, and a plurality of fluid pressure actuators mounted on the upper die plate so as to at least ascend / descend the injection nozzle and operated by fluid pressure from a supply source introduced into an internal pressure chamber In the machine, a fluid passage communicating with a pressure chamber of the fluid pressure actuator is formed in the upper die plate, and a fluid pressure is introduced from a supply source to the fluid pressure actuator through the fluid passage. Injection molding machine.