JPH0736737Y2 - Automatic safety door device in mold clamping device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic safety door device in a mold clamping device provided in a synthetic resin molding machine such as an injection molding machine.

[0002]

2. Description of the Related Art A safety door for preventing an operator from being caught in a mold attached to a fixed plate and a movable plate is provided at a side portion of a mold clamping device provided in an injection molding machine. The mold cannot be clamped while is open.

The opening and closing of the safety door during the molding operation is often performed to remove the molded product during the molding in which automatic mold release is difficult, or during insert molding.
Most of them have a structure that is manually performed by the workers themselves.

[0004]

However, as the molding machine becomes larger, the safety door also becomes larger and heavier, and it becomes difficult for the operator to open and close it. An automatic opening and closing type safety door that uses a power source as a drive source is adopted.

In such a safety door, since the safety door is automatically opened by the mold opening completion signal and the door is automatically closed by the switch operation, unlike the case of manual operation, the door closing side is closed. Since the hands and the like are easily pinched by the edge, and there is a risk of serious injury to the worker, improvement is desired from the viewpoint of safe work.

The present invention has been conceived in order to solve the above-mentioned conventional problems, and its purpose is to apply a slight external pressure to the closing side edge of the door by adopting a flexible member. However, it is an object of the present invention to provide an automatic safety door device in a mold clamping device that can immediately stop the closing operation of the safety door and switch to the opening operation to prevent the worker from being injured by the door.

[0007]

This invention for the above object has a movable plate which can be moved forward and backward with respect to a fixed plate on a machine base, and a safety door is laterally opened and closed on a side machine base of the movable plate. In a mold clamping device which is freely provided and whose safety door is opened and closed by an opening or closing cylinder by hydraulic or air provided with an operating circuit, a touch sensor which operates the operating circuit of the opening and closing cylinder at the door opening side at the closing side edge of the safety door. The touch sensor is provided with a pair of long conductors made of thin metal plates that are placed opposite to each other with a gap, and a flexible synthetic resin coating that holds both ends of the conductors insulative and wraps freely by external pressure. The touch switch that is long in one direction is inserted into a flexible protective tube, and the touch switch is attached to the closed side edge via a seat plate fitted to the protective tube. .

[0008]

[Operation] With the above configuration, if something touches or hits the closing edge of the door while the safety door is moving in the closing direction by the opening / closing cylinder, the protective tube and synthetic resin coating at that location will Partial deformation causes the pair of conductors to come into contact, and the touch sensor is turned on. As a result, the operating circuit of the opening / closing cylinder is switched, the safety door is automatically opened, and a person or hand is prevented from being pinched by the closing side edge of the door.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 in the drawing denotes a mold clamping device, which has a movable platen 4 which can move forward and backward relative to a fixed platen 3 on a machine base 2, and a safety door 5 is laterally mounted on a side machine base of the movable platen 4. It can be opened and closed freely.

As shown in FIG. 2, a piston rod 7 of an open / close cylinder 6 driven by hydraulic pressure or air is connected to the inside of the safety door 5. This open / close cylinder 6
Can be opened / closed by the operation of the electromagnetic valves V1 and V2 provided in the operation circuit 8, and the braking member 9 operated by the electromagnetic valve V3 can restrain the moving piston rod 7 to immediately stop the safety door 5. You can do it.

A touch sensor 10 is provided on the closed side edge of the safety door 5 over the entire edge except the upper end 5a. The touch sensor 10 includes a pair of long conductors 11 and 12 made of thin metal plates which are connected to lead wires (not shown) and which are arranged opposite to each other with a space therebetween.
Both ends of the touch panel are insulated and held, and the touch switch 13 that is long in one direction by the flexible synthetic resin coating 13a that wraps freely by external pressure is formed, and the bottom side is formed thick and flat to protect the flexibility. It is inserted in the tube 14.

The touch sensor 10 is attached to the closing side edge of the door with a seat plate 15 fitted to the bottom surface of the protective tube 14, and is a conductor when the protective tube 14 is partially crushed by external pressure and deformed. 11 and 12 are bent and come into contact with each other to be turned on.

Next, the operation will be described. In the air actuation circuit 8, when the electromagnetic valves V1 and V2 are switched to the a side and the electromagnetic valve V3 is excited, the braking member 9 releases the piston rod 7, the opening / closing cylinder 6 closes, and the safety door 5 opens.
Moves in the closing direction due to the extension of the piston rod 7.

The movement of the safety door 5 slows down when the safety door itself operates by inputting the limit switch installed in advance, and then the upper end portion 5a of the closing side edge is brought into contact with the fixed platen 3 to be closed.

When the touch sensor 10 is touched by a person in the course of such a closing operation and the touch sensor 10 is turned on by the external pressure at that time, the electromagnetic valve V3 is deenergized and switched, and the braking member 9 is turned on. It operates and restrains the piston rod 7. As a result, the safety door 5 suddenly stops.

This sudden stop of the safety door 5 is temporary in order to prevent movement of the safety door 5 due to inertia or a delay in response of the operating circuit 8.
The electromagnetic valves V1 and V2 are switched to the b side, and the electromagnetic valve V3 is excited later so that the braking member 9 releases the piston rod 7. As a result, the opening / closing cylinder 6 is switched to the opening operation, and the piston rod 7 moves backward.
Also opens immediately and returns to its original position. As a result, an accident in which a person, a hand, or the like is caught by the automatic closing of the safety door 5 is prevented.

[0017]

As described above, the present invention has a movable plate movable forward and backward with respect to a fixed plate on the machine base, and a safety door is provided on the upper side of the machine base so that it can be opened and closed laterally. A safety sensor is provided on the closing edge of the safety door of the mold closing device that opens and closes the safety door together with the operating circuit by the hydraulic or air opening / closing cylinder. If the touch sensor is turned on while the door is moving in the closing direction, the safety door will automatically open, so even if the opening and closing of the safety door is automated, people or hands will be caught. It is possible to prevent accidents such as accidents.

Further, the touch sensor includes a pair of long conductors made of thin metal plates which are arranged opposite to each other with a space therebetween, and a flexible synthetic resin coating which holds both ends of the conductors insulatively and can be contacted by external pressure. The touch switch that is long in one direction is configured by inserting it into a flexible protective tube, and its touch sensor is attached to the closing side edge via a seat plate fitted to the protective tube. The touch switch is also deformed by the external pressure so that the touch switch operates, and the operation is not limited to a specific part and extends to the whole. Therefore, the certainty is higher than that when the limit switch is adopted.

Further, since the touch sensor as a whole is soft and flexible, it is not injured even if the hand or arm hits the closing side edge strongly during work, and it is more effective than the case where it is operated by mechanical means. The structure and installation of the device is simple,
Since it does not require a detector such as a limit switch, it has features such as cost reduction.

[Brief description of drawings]

FIG. 1 is a side view of a molding machine equipped with the automatic safety door device of the present invention.

FIG. 2 is an explanatory diagram of an automatic safety door device.

FIG. 3 is a plan cross-sectional perspective view of a touch sensor.

[Explanation of symbols]

 1 mold clamping device 2 machine base 3 fixed plate 4 movable plate 5 safety door 5a upper end 6 opening / closing cylinder 7 piston rod 8 actuation circuit 9 braking member 10 touch sensor 11 conductor 12 conductor 13 touch switch 13a synthetic resin coating 14 protective tube 15 seat Board

Claims (1)

[Scope of utility model registration request] 1. A movable plate is provided to move forward and backward with respect to a fixed plate on the machine base, and a safety door is provided on the upper side of the machine base of the movable plate so as to be opened and closed laterally, and the safety door is provided together with an operating circuit. In a mold clamping device that opens and closes by a hydraulic or air opening and closing cylinder, a touch sensor that operates the opening and closing cylinder operation circuit to the door opening side is provided at the closing side edge of the safety door, and the touch sensor is opened at intervals. A touch switch long in one direction with a pair of long conductors made of metal thin plates placed oppositely and a flexible synthetic resin coating that insulates and holds both ends of the conductors and is freely contactable by external pressure.
An automatic safety door device in a mold clamping device, characterized in that it is inserted into a flexible protective tube and is attached to the closing side edge through a seat plate fitted to the protective tube.