🛡️Press Machine Overload Protection System – KOSMEK KOLP PL Series

Brand: KOSMEK (Japan) | PL Series (Spring Type - Fixed Pressure)
Repeatability Accuracy ±3% — Stable, reliable solution for mass production lines.

📘Introduction to KOSMEK KOLP PL Series System

The KOSMEK Overload Protection System (KOLP) is an indispensable hydraulic safety device that maximizes capacity and ensures safe press operation. The PL Series (Spring Type) is a specialized solution for applications requiring absolute stability and reliability with an unchanging working pressure.

Unlike the PH series (pneumatic type) which allows flexible pressure adjustment, the PL Series has a fixed overload pressure set by a spring at the factory. This makes it the ideal choice for mass production lines where a single protection pressure level is used continuously, eliminating the risk of incorrect parameter settings.

KOSMEK KOLP PL Series

✨Key Features

• ✓Fixed & Stable Pressure: Overload pressure is preset by a spring, ensuring high stability and preventing incorrect adjustments, ideal for mass production.
• ✓Extremely Fast Response Time: Less than 1 msec. The pilot valve directly actuates the limit switch, sending an emergency stop signal simultaneously with oil release.
• ✓Superior Accuracy: Repeatability accuracy within ±3%. Even if the overload stroke increases, the operating accuracy is maintained within +10%.
• ✓Excellent Vibration Resistance: The switch has a vibration resistance of over 70G.
• ✓Compact Integrated Design: Integrates pump, valve, pressure switch, and air release valve in a compact block (Type PL10 and PL16).
• ✓Wide Application Range: Multiple models (PL10, PL16, PL35) suitable for presses from 200 kN to 20,000 kN.
• ✓Easy Recovery: Simply switch the machine to "Inching" mode, return the slide to the top dead center, remove the cause of the overload, and reset the system.

⚙️Operating Principle (PL Series)

1. Preparation: Supply compressed air to the KOLP. The built-in hydraulic pump operates, generating a preset pressure (preload) in the press's Overload Cylinder (O.L.C). When the set pressure (controlled by the pilot valve and spring) is reached, the limit switch is activated, signaling the machine is ready.
2. Overload Detection: When the press encounters an overload, the pressure in the O.L.C spikes. When this pressure overcomes the fixed force of the spring, the pilot valve moves and instantly releases the hydraulic oil back to the tank (response time < 1 msec).
3. Emergency Stop: Simultaneously with the oil release, the pilot valve releases the limit switch, sending an "OFF" (Emergency Stop) signal to the press and cutting off the compressed air supply to the KOLP.
4. Recovery: After removing the cause of the overload and returning the slide to top dead center, the operator simply presses the reset button to re-supply compressed air to the KOLP. The system will automatically recharge to the set pressure and be ready to operate again.

📋General Specifications (PL Series)

(Note: Model selection (size, pressure code) depends on the calculation of discharge flow rate and working pressure. Please refer to the technical catalog or contact PRESTEC for precise consultation.)

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