Mill Roll Tongs: Roll Handling in Steel Plants and Rolling Mills

Mill roll tongs are specially designed for heavy-duty roll handling in steel plants and rolling mill workshops, enabling safe and precise lifting operations. These tongs feature a customized design that ensures a secure grip on the rolls while effectively preventing surface damage, thereby improving roll maintenance efficiency and enhancing the reliability of the production process.

Mechanical Single Mill Roll Tongs

• Used in rolling mill grinding workshops for lifting single rolls onto and off the grinder, as well as for transferring individual rolls.
• The tongs open and close through a gravity-actuated mechanism, allowing the jaws to securely clamp the roll during operation.
• When lifting a roll, the tongs are supported on the roll's bearing housings via support structures at both ends. The device can handle 2–3 types of rolls, and when lifting rolls of different diameters, the support height is adjusted by inserting or removing positioning pins. The pin adjustment is convenient, simple, and reliable.
• The inner clamping surfaces that contact the roll are lined with copper plates to prevent any indentation or surface damage during lifting.

Mechanical Double Mill Roll Tongs

• The double roll lifting device is used in roll shops of rolling mills for handling double-roll assemblies.
• The tongs open through a gravity-actuated mechanical mechanism, and during operation, the jaws securely clamp the rolls.
• When lifting the roll assembly, the tongs are supported directly on the roll's bearing housings via support structures at both ends. The tongs can handle 1–3 different roll diameters. For different roll sizes, the support height is adjusted by inserting or removing positioning pins, which provides convenient, simple, and reliable adjustment.
• The inner gripping surfaces that contact the rolls are lined with steel plates to ensure that no indentations are left on the roll surface during handling.

Electromotive Mill Roll Tongs

• Used in rolling mill grinding workshops for lifting single rolls onto and off the grinder, as well as for transferring individual rolls.
• The tongs are opened and closed by an electric actuation mechanism. During operation, the pins on the tong arms align with the pin holes on the roll sides. The positioning plates at both ends ensure the correct relative alignment between the pin and the pin hole.
• The inner gripping surfaces that contact the roll are lined with nylon plates and equipped with limit sensors to prevent any indentation or surface damage when contacting the roll.

Safety and Operating Precautions

• Stop the test lift immediately if any abnormal noise, deformation, or cracks are observed.
• Proceed with lifting and transporting only after the test lift has been successfully completed.
• During lifting operations, ensure that all personnel clearly understand the warning signals and maintain visible communication with the operator.
• No personnel are allowed to stand under the load, and manual support of the load is strictly prohibited.

Routine Maintenance of Mill Roll Tongs

• If the rotary lock becomes stiff or fails to rotate into position during use, inspect and adjust the regulating nut, then check the following areas:
  • Check whether the pawl's tension spring is damaged; replace it if necessary.
  • Check for jamming in the transmission mechanism. If jamming is caused by poor lubrication, apply lubricating oil or grease to all moving joints. If the guide pins are too tight, loosen the nuts appropriately. If looseness, deformation of the transmission tube, or deformation of linkage rods is found, correct them accordingly.
  • Check whether the buffer spring has insufficient extension. If the extension is too small, shorten the steel wire rope that connects to the buffer spring.
• Prevent the indicator markings on the tong's indicator plates from peeling. Reapply the original marking paint immediately once peeling is found.
• Clean and lubricate the wire ropes regularly, especially at bending points, using suitable lubricating oil or grease.
• Primary load-bearing components, such as lifting lugs, rotary locks, plates, and rigging shackles, should be inspected at least once every three months under normal operating conditions. These parts must not exhibit cracks or significant deformation.
• All oil cups, including the ones on the ratchet mechanism, the sliding bearing housings, and the rotary lock housing, should be lubricated in a timely manner according to operating conditions. Lubrication should also be applied to the main moving joints as needed.
• Regularly check whether rope clips are loose and whether buffer springs are overstretched; address any abnormalities immediately.
• Never exceed the rated lifting capacity of the lifting device, and do not allow the buffer spring to be overstretched.
• Ensure smooth and steady lifting during operations to avoid deformation caused by impact between the lifting device, crane, or other equipment.

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