How to ensure the safety and reliability of fiber cutter of intelligent spinning equipment?

In order to ensure the safety and reliability of the fiber cutter of intelligent spinning equipment, it is necessary to build a four-in-one protection system of "mechanical protection+electrical interlocking+intelligent monitoring+management specification", covering the whole scene of equipment operation and eliminating potential safety hazards such as misoperation, mechanical injury and electrical failure. The specific implementation points are as follows:

First, build a mechanical protective barrier to isolate risks from the physical level.

Fully enclosed protection of key moving parts

For dangerous parts such as high-speed rotating cutter set (moving cutter+fixed cutter), transmission chain/synchronous belt, feeding roller, etc., a rigid metal protective cover shall be installed, and the protective cover shall be fixed by bolt fastening or quick-release safety lock catch, and temporary fixing methods such as iron wire and adhesive tape are prohibited. The mesh or gap of the protective cover shall meet the safety standards, and the size shall be ≤5mm to prevent the operator's fingers or tools from entering by mistake.

The inlet and outlet should be provided with anti-fiber splash baffles to avoid short fibers bouncing up and hurting people during cutting; At the same time, a sound insulation layer is installed inside the protective cover to reduce the noise generated by the high-speed operation of the cutter set (controlled below 85dB).

Equipment structure and space safety design

Anti-skid treatment is required for the fuselage of the cutting machine, and a safe operation area of ≥1.2m is set around the equipment. It is forbidden to pile up materials, tools and other sundries in the area, and yellow warning line signs are painted on the ground.

The equipment maintenance side needs to be provided with a detachable protective door, and the protective door is linked with the equipment power system (see the electrical interlocking section below for details), so as to ensure that the machine stops immediately after opening the door.

Second, strengthen electrical interlocking and control protection to realize automatic shutdown of faults.

Configuration and debugging of core safety interlock device

Protective door interlock: install electromagnetic interlock switches at the protective cover and access door of the cutter group. When the protective door is not completely closed or opened without authorization, the control system will immediately cut off the power supply of the motor, and the equipment will not start or stop urgently during operation; The sensitivity of interlock switch should be tested regularly to avoid contact oxidation failure.

Redundancy design of emergency stop system: red mushroom head emergency stop buttons are set on the equipment operation panel, both sides of the fuselage, and at the inlet/outlet. The buttons should be prominent and easy to operate. After being pressed, all power circuits can be cut off and kept locked, which can only be released after being rotated and reset. The emergency stop circuit adopts double-wire system design to avoid protection failure caused by single-wire fault.

Safety light curtain/laser scanner protection: If the cutter needs to manually approach the feed inlet to adjust the fiber, a safety light curtain should be installed in the man-machine interaction area, and the sensing range of the light curtain should cover the whole dangerous area; When human body or foreign body enters the sensing area, the equipment will slow down and stop immediately, and it will need to be reset manually after leaving.

Electrical control safety protection

The control cabinet should have the functions of overload, short circuit and leakage protection, and the motor circuit should be equipped with a thermal relay to prevent the motor from being burnt out due to overload; The grounding resistance of the equipment should be ≤4Ω, and the grounding electrode should be separated from the grounding system of other equipment in the spinning production line to avoid static electricity or leakage conduction.

Hierarchical management of control system setting authority: operators can only modify production parameters (cutting length and speed), and equipment debugging and parameter locking need to be authorized by administrators; It is forbidden to shield any safety protection function, and the system needs to record all authorized operations and shutdown reasons for traceability.

Third, install intelligent monitoring system to realize early warning of risks.

Condition monitoring of key components

Vibration sensors are installed at the bearing of the cutter set and the shaft end of the motor to monitor the running vibration value in real time; When the vibration exceeds the set threshold (such as abnormal vibration of bearing and unbalanced cutter set), the system will automatically give an early warning and stop the machine to prevent accidents such as broken cutter and locked bearing.

Install tool wear detection device: use laser or visual sensor to detect the wear degree of the blade. When the wear amount exceeds the standard, the system will prompt to replace the tool, so as to avoid the fiber breaking and material jamming caused by the passivation of the blade, which will lead to equipment overload.

Intelligent identification of process anomalies

Equipped with feed tension monitoring sensor, when the fiber conveying tension is too large or too small (such as fiber knotting and feed interruption), the system will stop immediately and give an alarm to prevent the fiber from winding the cutter set and causing equipment damage or personal injury.

Install a temperature sensor to monitor the temperature rise of the motor and reducer. When the temperature exceeds 70℃, automatically start the cooling fan or stop the protection to avoid electrical failure or fire hazard caused by high temperature.

Fourth, improve management norms and personnel training to eliminate man-made security risks.

Establish standardized safety operation procedures (SOP)

Make clear the items to be checked before starting the equipment: whether the protective device is in good condition, whether the emergency stop button is effective, whether the sensor is normal and whether the grounding is reliable; It is strictly prohibited to clean, lubricate or adjust components while the equipment is running.

Formulate fault handling specifications: after the equipment stops and gives an alarm, it is necessary to investigate the cause of the fault first, and it is forbidden to reset and start it forcibly; When maintaining the cutter set, cut off the main power supply first, hang the warning sign "Equipment maintenance, no closing", and arrange special personnel for supervision.

Regular maintenance and safety verification

Make the maintenance plan of protection system: test the effectiveness of emergency stop button, interlock switch and safety light curtain every week; Check the fastening of protective cover and the calibration accuracy of sensor every month; Conduct a comprehensive safety assessment every quarter to replace aging electrical components and protective components.

Establish safety verification files: record test data after each maintenance and debugging to ensure that the protection system always meets safety standards; After the acceptance of new equipment or equipment modification, third-party safety certification is required.

Professional training of operators

All operators must pass the safety training and examination before they can take up their posts. The training contents include the identification of dangerous points of equipment, the use of safety devices, emergency handling procedures, etc.

Organize emergency drills on a regular basis, and simulate such scenes as "protective door opens and stops", "material jammed and emergency stop" and "emergency stop button triggered" to improve the emergency handling ability of operators.

Core summary

The key to the reliability of safety protection is "prevention first, multiple protection, and whole process controllability": physical risks are isolated by mechanical protection, forced shutdown is realized by electrical interlocking, failure is early warned by intelligent monitoring, and human error is eliminated by management norms, all of which are indispensable to ensure the long-term safe and stable operation of the fiber cutter.