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For box-type heat treatment resistance furnaces, primary maintenance is carried out after 400 hours of operation; it is primarily performed by the operators, with the assistance of maintenance workers. First, turn off the power supply, then carry out the maintenance work (see the table below). Serial Number Maintenance Area Maintenance Content and Requirements 1 External Maintenance Clean the surrounding area. Wipe the exterior of the equipment clean to keep it tidy, free from dust and rust. The ordinary-type furnace door of the second furnace chamber is used to remove oxides and debris. Check that the support bricks, wire-supporting bricks, and refractory bricks at the furnace bottom are neat, secure, and in good condition. Check whether the furnace lining wire-supporting bricks are in good condition; repair any damaged bricks and reorganize the resistance wires. Cart-type maintenance as mentioned above. Check the deformation of all moving tracks and guides on the trolley; there is no bending phenomenon. Check whether the motor’s guide tube is bent, and whether the guide strips are damaged or broken. Also, check the operating condition of the motor. Check the fit between the resistance wire plug of the trolley and the socket in the furnace body. For the three furnace doors, check the door viewing holes, the sprockets used for lifting and lowering the doors, as well as the counterweights, to ensure smooth opening and closing. Check the deformation of the inner platform of the furnace door as well as the gap between the furnace body, to maintain the sealing performance of the furnace door. Clean the electrical control panel and electrical devices for the four electrical temperature control instruments, and ensure they are properly fixed in place. Check the automatic and manual modes of the temperature measuring instrument; ensure proper sensitivity, accurate door positioning, and removal of residual magnetism. Check the position of the thermocouple inside the furnace to ensure it is correct and appropriate. Secondary maintenance is carried out after the equipment has been in operation for 1,000 hours; it is primarily performed by maintenance workers, with the assistance of operators. In addition to carrying out the tasks and meeting the requirements of primary maintenance, the following actions must be taken, as well as the vulnerable components should be documented, and spare parts should be identified. First, turn off the power supply, then carry out the maintenance work (see the table below). Serial Number Maintenance Area Maintenance Content and Requirements 1. External Maintenance: Check the insulation and sealing performance of the furnace body, and determine a repair plan based on the findings. The furnace body was repainted with anti-rust and weather-resistant paint. In the second furnace, check the resistance values of each set of resistance wires in the standard manner, and repair or replace them according to the degree of wear. Inspect the burn damage and deformation of the furnace bottom plate, and reshape or replace it as appropriate based on the extent of the damage. Trolley-type shaping of various tracks and guides. Disassemble and clean the drive gears and chains. Disassemble and clean the roller bearing. Remove the hand-crank sprocket from the three furnace doors. The furnace door was reshaped and the refractory bricks were replaced to ensure that the gap and sealing performance of the furnace door meet the specified requirements. The four electrical temperature control instruments were inspected for any damage to the insulating porcelain tubes of the resistance wire leads and thermocouples; all were within acceptable standards, with no damage or cracks present. Secure the grounding device. Check the instruments. Measure the temperature uniformity in the effective heating zone of the furnace.