What should be paid attention to after the vacuum furnace repaired by industrial electric furnace manufacturers

       Industrial electric furnace manufacturers

      A vacuum furnace is a device for heating in a vacuum environment, which is generally composed of a furnace, an electric heating device, a sealed furnace shell, a vacuum system, a power supply system, and a temperature control system. Vacuum furnaces are divided into vacuum resistance furnaces, vacuum induction furnaces, vacuum arc furnaces, vacuum consumable arc furnaces, electron beam furnaces and plasma furnaces according to heating elements.

　　 After using anything for a certain period of time, some minor failures will inevitably occur. Then, what should I pay attention to after repairing the vacuum furnace?

　　 vacuum furnace is mainly used for ceramic firing, vacuum smelting, degassing of electric vacuum parts, annealing, brazing of metal parts, and ceramic-metal sealing, etc. After the vacuum furnace is repaired, the furnace must be dried and the vacuum furnace must be vacuum leak-checked. Before the vacuum furnace is baked, the insulation of the vacuum furnace can be tested with a 1000V shaker, and it is normally not less than 2MΩ.

　　 Vacuum furnace oven is divided into three stages:

　　①The moisture discharge period is 0～200℃, which is the discharge period of the moisture in the insulation layer of the vacuum furnace and the moisture in the vacuum furnace body. The vacuum degree of the vacuum furnace must be checked, and the heat preservation time is longer.

　　②The temperature zone where the gas discharge volume of the vacuum furnace body is large is generally around 500℃. Because the gas discharge volume of the vacuum furnace is relatively large, the temperature rise does not exceed 50℃/h at this time. The holding time is generally more than 60 minutes

　　③The heat preservation period is about 1200℃, every time the heating rises by 100～200℃, it needs to be kept for a period of time. If the temperature rises too fast, it will damage the insulation layer and the vacuum furnace will not vent completely.

The vacuum tempering furnace compiles vacuum furnace operation and maintenance operating procedures, establishes vacuum furnace operation records and repair files, counts cumulative operating hours, strengthens daily maintenance of vacuum furnaces, grasps the changing trend of equipment technical status, early detection of failure and damage signs, and avoids accidents and repairs. According to the work load and operating conditions of the vacuum furnace, prepare the parts for the repair of the vacuum furnace in advance and prepare the operation and maintenance plan of the vacuum furnace. For example, the service life of the heating element of the vacuum furnace is related to many factors such as the working temperature, the product medium in the vacuum furnace, the number of products and the operating conditions. In the case of processing and production 24 hours a day, the replacement of the heating element and heat shield of the vacuum furnace is approximately It is done every two or three years. It depends on the type of brazing work and the number of uses.

　　Vacuum furnaces generally have more leakage failures in the spring and autumn seasons, and vacuum furnaces that have been idle for a long time are more likely to have leakage failures when they are only used. Vacuum leak detection must be performed at this time. Vacuum leak detection is generally done by measuring the pressure rise rate once a month (at room temperature, close all vacuum valves, stop the vacuum system, read a number after 10min, and then read a number after 1h, two The difference between the numbers is the value of the pressure rise rate), and grasp the change trend of the equipment leakage.

　　 The precautions for the use of the vacuum furnace include: 1. The workpiece-the workpiece car must be cleaned and dried before entering the furnace to prevent moisture and dirt from entering the furnace. 2. When all the transmission parts are found to be stuck, inaccurate in the limit, and control failure, they should be eliminated immediately, and do not force the operation to avoid damage to the parts. 3. Operate strictly in accordance with the operating procedures, and not to lift the switch at will, and it is strictly forbidden to operate by informal operators.