Nanjing Gaojing Gear Group Co., Ltd. mainly produces all kinds of high-speed and heavy-duty series gearboxes. The heat treatment process is mainly carburizing, quenching and tempering. The depth of carburized layer is up to 8mm, and the hardness of tooth surface is 58~62HRC. The weight of a single piece is 40t. In order to ensure the quality of the heat treatment, higher requirements will be placed on the large-scale well carburizing furnace, and the systemicity and sustainability of equipment maintenance will be more concerned.
Director of Safety and Environmental Protection Department of Nanjing Gaojing Gear Group Co., Ltd.
At present, Nanjing Gaojing Gear Group Co., Ltd. has a total of dozens of large-scale well carburizing furnaces, with a diameter of 1500-4000mm, a depth of 2000-5500mm, and a furnace weight of 10~40t. The following is an example of a large-scale well carburizing furnace introduced from Germany's Haitian Köhoff company in 1995. The main technical requirements are shown in the attached table.
The equipment is qualified from installation and commissioning to acceptance, and finally put into use. In order to ensure the continuous normal operation of the equipment, subsequent maintenance is particularly important. According to the importance of equipment parts, maintenance frequency, etc., it is divided into 5 parts and is graded.
(1) The furnace body part (including the furnace cover, furnace wall and furnace bottom) mainly includes: furnace cover lifting system, guide rail, walking limit, fan motor, pipeline, drip system, furnace mouth seal, air deflector, horse Aspens, diversion tubes and insulation, as well as bricks, seals, etc.
(2) Temperature control systems mainly include: thermocouples, temperature meters, various types of indicators and lines.
(3) The carbon potential control system mainly includes: oxygen probe and infrared instrument control system, methanol and isopropyl alcohol drip system, flow meter, liquid nitrogen gas supply device and air compressor.
(4) The water cooling system mainly includes the pressure and piping of the cooling system such as the furnace cover, the muffle tank, the fan motor and the bottom sealing oil.
(5) Electrical cabinets mainly include: line cleaning, air conditioning inspection, switch knobs and alarm systems.
The above five sections contain 45 small items for classification maintenance and refinement. Maintenance personnel: equipment operators, maintenance workers, electrical engineers; maintenance frequency: daily, weekly, monthly, quarterly and annual maintenance; after maintenance, a special person is responsible for inspection and scoring.
After a long period of operation, the equipment management work has been continuously improved and improved. The technical indicators of the equipment still maintain good performance, and provide support for ensuring product quality and achieve good economic benefits.
Large carburizing furnace
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