JPH053375B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention protects workers from danger when opening the front door that covers the mold clamping section of an injection molding machine, and at the same time protects workers from danger when opening the front door that covers the mold clamping section of an injection molding machine. This invention relates to an electrical safety device for a front door that can reliably close and lock the front door.

Conventional technology and its problems In conventional injection molding machines, when the front door is opened, the mold clamping hydraulic pressure is cut off, the mold clamping part is mechanically locked, and the opening of the front door is detected by a limit switch, etc. The mold clamping mechanism was controlled by a controller or program to prevent it from operating.

By the way, when the front door is opened, if this opening is detected by the limit switch and the controller stops the driving means of the mold clamping mechanism according to a program, the safety of the workers can be ensured. However, when the limit switch did not work,
It is assumed that the controller may malfunction, and this alone is a cause for concern. In other words, the conventional technology does not have a structure that detects and confirms that the front door is closed when the mold clamping process is about to start, prohibits the opening of the front door itself, and at the same time notifies you if you forget to close the front door or if the front door is closed incorrectly. Therefore, even though the molding equipment has actually been activated and the mold clamping process has started, and the mold clamping process is about to start, the machine forgets or opens the front door without realizing it. In such cases, it is difficult to say that simply prohibiting mold clamping is sufficient to ensure safety.

Purpose of the Invention In order to solve the above-mentioned problems, the present invention not only prohibits the mold clamping operation when the front door is opened, but also prohibits opening of the front door before starting the mold clamping operation. To provide a front door electrical safety device capable of preventing forgetting to close a door or improperly closing the door.

Means for Solving the Problems FIG. 1 is a schematic diagram showing the configuration of the present invention,
Referring to this, the front door electrical safety device of the present invention includes a first detector A that detects the closing of the front door that covers the mold clamping part, a front door locking means B that locks the front door, and a front door locking means B that locks the front door. It includes a second detector C that detects the operation of the door locking means, an alarm device E, and a control means D.

This control means D controls the first
The front door locking means B is activated by confirming that the front door is closed by the output signal of the detector A,
The operation of the front door locking means B is confirmed by the output signal of the second detector C, and then the mold clamping drive means F is driven. In both cases, when the output signal indicating the closing is not inputted, and when the output signal indicating the operation of the front door locking means B is not inputted from the second detector C when confirming the operation of the front door locking means, The alarm device E can output an alarm.

Operation When the start of the mold clamping process is commanded via the control means F, the first detector A confirms that the front door is closed, and the front door locking means B is activated to close the front door. After locking the door and confirming the operation of the front door locking means with the second detector C, the mold clamping drive means F is driven to start mold clamping, and the first and second detectors A , C detects that the front door is not closed or that the front door locking means B does not lock the front door, an alarm device is activated to issue an alarm and the mold clamping operation is stopped.

Embodiments FIGS. 2 to 4 show embodiments of the present invention. As shown in Figure 2, the front door 1 that covers the molding section
There is a first device inside the device that detects the closing of the front door 1.
A first limit switch LS1 is provided as a detector, and a solenoid for locking the front door 1 when the front door 1 is closed.
A second limit switch LS2 is provided as a second detector for detecting that SOL and the solenoid SOL are activated to lock the front door 1.

FIG. 3 is a block diagram of the control device 3 of this embodiment, and 4 is a central processing unit (hereinafter referred to as CPU).
Controls the entire injection molding machine. 5 is ROM,
A memory composed of RAM, and a CPU 4 performs overall control according to a control program stored in the memory 5. Reference numeral 6 denotes an input/output circuit, which is connected to the limit switches LS1, LS2, the solenoid SOL, a drive control device 7 for the mold clamping motor M, an injection device, and the like. 8 is a manual operation device provided on a control panel or the like. 9 is an alarm device consisting of a lamp, a bell, etc. Note that 10 is a bus.

Next, the operation of the above embodiment will be explained with reference to FIG. 4. When the start button is pressed from the manual operating device 13 to perform injection molding, the start of the mold clamping process is commanded, and the mold clamping process begins.
Whether limit switch LS1 is ON or not,
That is, it detects whether or not the front door 1 is closed, and when the front door 1 is not closed, the alarm device 10 is activated and an alarm sound is emitted to warn the operator to close the front door 1. prompt. When it is detected that the front door 1 is closed, the solenoid SOL is activated to lock the front door 1. Then, it detects whether or not the second limit switch LS2 is ON, that is, whether or not the solenoid SOL operates correctly and locks the door. If the lock is not locked correctly, the alarm device 1
0 will sound an alarm. Then, only when the door is properly locked will the motor M be driven to operate the mold clamping mechanism.

Effects of the Invention As described above, in the present invention, when attempting to drive the mold clamping mechanism, the front door is confirmed to be closed, the front door is locked, and the front door is further confirmed to be properly locked. Since the front door is always closed when the mold is clamped, and the front door cannot be opened when the mold is clamped, the safety of the workers is ensured. I can do it. In other words, even though the molding equipment has actually been activated and the mold clamping process has started, and the mold clamping process is about to start, the mold clamping machine may forget or open the front door without noticing. This will be prevented.

Additionally, an alarm is issued in conjunction with the process of confirming that the front door is closed and that the front door locking mechanism is operating, thereby preventing forgetting to close the front door or improperly closing the front door. At the same time, it is also possible to notify that the front door is not properly locked.

Therefore, according to the present invention, the molding operation including the mold clamping process can be reliably performed while ensuring the safety of the workers.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the present invention, FIG. 2 is an external view of a front door according to an embodiment of the present invention, FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 1 is a flowchart of an embodiment of the present invention. 1...Front door, 2...Handle, LS1...
First limit switch, LS2...Second limit switch, SOL...Solenoid.

Claims (1)

[Claims] 1 In an injection molding machine, a first detector detects the closing of a front door covering a mold clamping section, a front door locking means for locking the front door, and a second detector detecting the operation of the front door locking means. a detector, an alarm device, and an output signal from the second detector that confirms the closing of the front door by the output signal of the first detector when a mold clamping process start command is issued and activates the front door locking means; The operation of the front door locking means is confirmed by the signal, and then the mold clamping drive means is driven, and when the closure of the front door is confirmed, an output signal representing the closure of the front door is input from the first detector. In either case, when the front door locking means is not activated, or when an output signal representing the operation of the front door locking means is not inputted from the second detector when confirming the operation of the front door locking means, the alarm device issues an alarm. An electrical safety device for a front door, characterized in that it has a control means for outputting an output.