Trapped Key Interlocking System is a safety locking system widely used in industrial machinery, pipeline systems, electrical switchgear, and other fields to prevent unauthorized or erroneous operations, ensure personnel safety, and normal operation of equipment. The system enforces the operation sequence through a physical locking mechanism to avoid potential safety hazards. As a professional trapped key interlock manufacturer, we will introduce the operation steps and maintenance methods of trapped key interlocking in detail to ensure the safety and reliability of the equipment.
1. The basic principle of trapped key interlocking
The trapped key interlocking system is a safety control device based on the principle of mechanical or electronic interlocking. Its basic working method is:
Control authority: Only after completing a specific operation can the key be removed or inserted to ensure the safety of the next operation.
Prevent misoperation: The operation must be performed in the set order, otherwise the next step cannot be performed.
Ensure a safe state: The key can only be released when the equipment is in a safe state to prevent people from mistakenly entering a dangerous area.
The system is usually composed of a lock body, a key, an actuator, etc., and realizes the interlocking function through a preset logical control process.
2. Operation Guide
2.1 Pre-startup inspection
Before using the trapped key interlock system, the following inspections should be performed:
Ensure that all interlocking devices are in the correct initial state.
Check whether the key is inserted in the correct position and ensure that all locking units are intact.
Record the operation log of the previous shift to ensure that the system has not been operated abnormally.
2.2 Operation steps
Unlock and enable equipment
Check whether the equipment is in a safe state (such as power off, mechanical parts stop moving).
Insert the master key and turn it to the unlocked position to release the keys of other interlocking units.
After removing the key, insert other related locking points in sequence to ensure that each device is in the correct working state.
Start the equipment and observe whether the operating status is normal.
Close and lock the equipment
Step by step in reverse order to ensure that all parts stop running.
Remove the keys in operation one by one and insert them into the designated locking units.
Ensure that the master key is finally locked to prevent accidental startup of the equipment.
Record the operation log for subsequent inspection.
3. Maintenance and care
3.1 Regular inspection
Check the locks and keys every week to ensure that they are intact and free of damage, rust or wear.
Check whether all mechanical interlocking parts move smoothly and without jamming.
Observe the smoothness of key insertion and removal. If there is jamming, it should be handled in time.
3.2 Cleaning and lubrication
Use non-corrosive detergent to clean the surface of the lock body regularly to avoid dust and foreign matter affecting its use.
Key parts such as key slots and rotating shafts can use special lubricants in appropriate amounts to reduce wear.
3.3 Preventive maintenance
Perform a comprehensive test every quarter to simulate the operation process to ensure the normal operation of the system.
Check the wear of vulnerable parts such as lock cylinders and keys and replace them if necessary.
Make sure that the key is properly returned after each operation to prevent the interlocking system from failing.
3.4 Safety precautions
It is strictly forbidden to forcibly remove the key or damage the lock at will, otherwise it may cause equipment misoperation and bring safety risks.
Ensure that all operators have received system training and understand the correct operation methods and emergency treatment plans.
Perform safety inspections regularly, especially when used in high-risk environments (such as high temperature, high pressure, and electrical equipment), and pay special attention.
Store spare keys and have them managed by a dedicated person to avoid system failure caused by key loss.
In the event of a failure, the machine should be shut down for inspection immediately, and no attempt should be made to repair the lock while the equipment is in operation.
The trapped key interlock system is an important equipment to ensure industrial safety, and its correct operation and maintenance are essential to the safety of personnel and equipment. Enterprises should establish detailed operating procedures and maintenance plans to ensure that the interlock system is always in the best condition. Through daily maintenance, regular inspections, and troubleshooting, the service life of the equipment can be effectively extended, safety can be improved, and the occurrence of safety accidents can be reduced. It is hoped that this guide can provide a valuable reference for operators and maintenance personnel in various industries to ensure the efficient and safe operation of the trapped key interlock system.
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Shanghai Nudango Safety Equipment Co., Ltd.
