Anti-Collision Protection Structures for Molds on Automatic Production Lines

With the popularization of fully automatic injection molding production lines, manipulators, automatic mold spraying and in-mold monitoring equipment have been widely used. The cross-operation of multiple equipment greatly increases the risk of collision between molds and automation accessories. Unattended automatic production is prone to sudden mold collision accidents caused by signal delay, program error and equipment deviation, resulting in slider fracture, cavity scratch, lifter damage and equipment scrapping, accompanied by long-term shutdown and high maintenance costs. A multi-layer anti-collision protection system is required to ensure the safe and stable operation of automatic molds.

1. Mechanical Hard Limit Anti-Collision Structure

Mechanical hard limit is the most reliable physical barrier for mold protection. Thickened quenched limit blocks are installed on moving and fixed molds to restrict the maximum mold closing stroke and prevent over-closing collision caused by manipulator signal delay. Wear-resistant gaskets are added to the contact surface to buffer instantaneous impact force and protect mold edges from chipping. Sliders are equipped with integrated limit bosses to fix the core-pulling and locking stroke, which can effectively limit slider displacement even when electrical signals fail. Equal-height limit columns under the ejector plate control the maximum ejection height to prevent lifters from rushing out of the cavity and colliding with descending manipulators. Raised protective baffles higher than the product outline are arranged around the cavity to block offset manipulators in advance and protect the mirror cavity from scratching.

2. Induction Early Warning Anti-Collision Structure

All moving components such as sliders and lifters are equipped with independent high-temperature resistant induction switches, which form signal interlock with injection molding machine and manipulator. The system automatically locks mold closing and material taking actions when the moving structure is not completely reset to avoid collision. The ejection system adopts dual-group position induction detection to avoid misoperation caused by single switch failure. Embedded photoelectric sensors in the cavity detect residual materials and foreign matters in real time, and immediately cut off the mold closing signal to prevent cavity crushing damage. Safety gratings are arranged in the mold operation area to realize emergency stop protection when the manipulator trajectory deviates.

3. Buffer Energy Absorption Protection Structure

Buffer structures are used to reduce minor collision damage. High-hardness polyurethane buffer pads are embedded at the contact positions of limit blocks, sliders and limit columns to convert rigid metal collision into soft energy absorption contact and avoid cavity indentation and edge collapse. High-temperature resistant nitrogen springs are matched with long-stroke moving structures to realize deceleration reset, eliminate inertial impact of high-speed movement and reduce hidden dangers caused by signal delay. The tail of the sprue bushing is equipped with a buffer positioning ring to correct the deviation of the injection nozzle and prevent hard impact damage.

4. Automatic Program Interlock Protection Logic

Establish signal interlock linkage among injection molding machine, manipulator and auxiliary equipment. All equipment stops waiting when a single action is not completed to avoid cross collision. Set segmented deceleration parameters for manipulators, automatically reduce speed when approaching the mold, and reduce impact force. Divide manual debugging, semi-automatic trial production and full-automatic mass production modes with different anti-collision authority to balance debugging convenience and production safety. Realize automatic origin self-inspection before each cycle to eliminate cumulative displacement errors and avoid continuous collision risks.

Summary

The four-layer protection system of mechanical limit, induction early warning, buffer energy absorption and program interlock complements each other to form a closed-loop anti-collision system. Standardized application of protective structures can effectively reduce the collision failure rate of automatic molds, reduce maintenance costs and downtime, and ensure the long-term stable and safe operation of automated injection molding production lines.