What are the safety protection devices of injection molding machines?

What are the safety protection devices for injection molding machines?
 
In the busy workshop of industrial production, injection molding machines continue to manufacture plastic products with their powerful molding capabilities, but at the same time, their complex mechanical structure and high temperature and high pressure working environment hide many safety risks.In order to ensure the life and health of operators and the smooth progress of production, a series of well-designed safety protection devices have emerged. They are like loyal guards to escort the safe operation of injection molding machines.
1. Mechanical protective barrier
Safety door interlocking device: This is one of the most common and vital protective components of injection molding machines.During the operation of the injection molding machine, especially during the injection and mold opening and closing stages, the mold area is in an extremely dangerous state, and high-speed moving parts and high-pressure environments may cause fatal injuries to nearby personnel at any time.The safety door linkage device ensures that the injection molding machine can only start operation when the safety door is completely closed and locked; on the contrary, once the safety door is accidentally opened, even if a gap is only slightly opened, the machine will immediately stop all actions and instantly cut off the power source, effectively preventing the operator from accidentally touching the dangerous area while the machine is running.
Light curtain protection system: For some large injection molding machines or scenes that require frequent access to the mold area for operation, the light curtain protection system provides more flexible protection.It consists of an infrared transmitter and a receiver, forming an invisible light curtain “cordon” in front of the mold.When an object blocks the light in the light curtain, the system will detect it within milliseconds and quickly send a signal to the injection molding machine control system to make the machine brake urgently.This non-contact protection method does not interfere with normal material handling, mold cleaning and other operations, but also monitors hazardous areas in real time, greatly improving operational safety.
2. Hydraulic and electrical safety and security
Hydraulic system safety valve: The hydraulic system of the injection molding machine is responsible for driving many key actions, such as mold opening and closing, injection, etc., and the working pressure is usually higher.The safety valve of the hydraulic system serves as the “guardian of the upper limit” of the pressure. When the internal pressure of the system exceeds the preset safety value due to failure or abnormal working conditions, the safety valve automatically opens to drain excess hydraulic oil to the fuel tank, avoiding high-pressure leakage accidents such as pipeline rupture and joint collapse, preventing high-pressure oil injection from hurting people, and ensuring that the hydraulic system is always in a safe and controllable pressure range.
Electrical leakage protection switch: Considering the large number of electrical components and complex wiring of injection molding machines, electrical leakage protection switch is essential.Once the equipment leaks, even if it is only a small leakage current, the leakage protection switch can sense and cut off the power supply in an instant, protecting the operator from electric shock, while avoiding secondary disasters such as electrical fires caused by leakage, and building a strong line of defense for the safety of electricity in the workshop.
3. Temperature and emergency braking protection
Temperature control over-temperature alarm device: The injection molding process has strict temperature requirements. The temperature of the barrel and mold is too high, which not only affects product quality, but may also cause serious safety issues such as fire.The temperature-controlled over-temperature alarm device monitors the temperature in real time. When the temperature approaches or exceeds the set safety upper limit, a loud alarm sound is immediately issued to remind the operator to check and adjust in time. At the same time, some advanced devices can automatically take cooling measures, such as increasing the flow rate of cooling water or suspending the heating element to prevent the temperature from getting out of control.
Emergency stop button: This is the ultimate “life-saving button” for responding to emergencies. It is located in conspicuous and easy-to-operate locations such as the operation panel of the injection molding machine and the periphery of the mold.No matter what kind of operating state the machine is in, once the emergency stop button is pressed, the injection molding machine will be completely powered off and shut down, and all actions will stop abruptly, so that the operator can terminate the dangerous process as soon as possible when encountering unexpected hazards, such as mold stuck, material splashing, etc., and buy critical time for subsequent troubleshooting and personnel safety.
In summary, these diverse safety protection devices cooperate with each other to weave a tight safety net for injection molding machines from different angles and levels.However, only the device is not enough. Enterprises also need to regularly maintain and inspect it to ensure the normal functioning of the protective function, and at the same time strengthen the safety training of operators, so that safety awareness is deeply rooted in the hearts of the people. A two-pronged approach can truly realize the safe production of injection molding machines.