This trolley-type resistance furnace is mainly composed of a furnace shell, a furnace lining, a furnace door and a lifting mechanism, a heating element, a trolley and a trolley traction mechanism, and an intelligent electrical control system. In the overall equipment design, the safety interlocking device between the furnace door and the trolley, the trolley and the furnace body seal, and the command heating are fully considered. That is, when the furnace door is not opened and raised to the set position, the trolley cannot enter or exit; when the trolley does not enter the set position, the furnace door lifting command is invalid. The safety interlocking device is linked together, and the command is tight, which ensures the safe and reliable operation of the overall equipment.
Furnace shell:
The furnace/oven/kiln frame is welded with high-quality national standard steel, the structure is firm and reliable, and all welds are even and smooth, without defects such as pores, inclusions, and unfused joints. The overall strength is good, not easy to deform, and the surface is flat and smooth.
Furnace lining:
In order to ensure that the furnace lining has good thermal insulation performance to achieve energy saving and reduce costs, and has a certain structural strength to meet the use conditions, the furnace lining adopts a new energy-saving pre-compressed ceramic fiber folding block with a fiber blanket, which is arranged in a soldier-like manner around the periphery and the top, and is fixed around the furnace with high-temperature resistant anchors of 1300℃. High-aluminum ceramic screws are inserted on the top of the ceramic fiber folding block to prepare for the use of hanging electric heating elements.
Furnace door and lifting mechanism
The furnace door device consists of the furnace door, furnace door lifting structure and furnace door clamping device.
3.1 The furnace door shell is welded by steel and plate to form a solid frame structure, and the lining is a refractory fiber module. The furnace door has the advantages of good thermal insulation performance and light weight.
Heating element
The resistance belt is wound into a corrugated shape and evenly arranged according to the power of each zone, which not only ensures the uniformity of the furnace temperature as a whole, but also ensures the interchangeability of each group of electric heating elements in the same zone. The surface load of the resistance belt is controlled between 1.4 and 1.7W/cm2. The heating element is made of 0Cr25Al5 high-temperature resistance electric heating alloy belt produced by Beijing Shougang, which is wound into an S shape and reasonably arranged around the furnace.
The resistance belt used has a small surface load and a long service life. Since the temperature above 800℃ is mainly conducted by radiation, the heating furnace adopts circumferential radiation heating to maximize the uniform heating of the workpiece.
The heating element is led out of the furnace through the lead-out rod, which is made of 0Cr21Al6Nb
Trolley and trolley traction mechanism
The trolley consists of a frame, trolley furnace lining, trolley traction mechanism, etc.
The temperature control system consists of thermocouples, intelligent temperature control instruments, solid-state relays, and circular chart recorders.
K-type thermocouples are used, and the temperature measurement range is 0-1100℃. The thermocouples are connected to the intelligent temperature control instrument to realize PID adjustment, and realize real-time monitoring and over-temperature alarm functions; the temperature control instrument is connected to the recorder to record the temperature of the heating zone. The temperature control instrument uses Shanghai Guolong's PID regulator. The temperature control instrument has a standard display panel. Through reasonable programming and parameter setting of the intelligent controller, the temperature and temperature correction can be set to achieve the best control of each temperature zone, and its automatic setting function can be used to achieve a more ideal temperature stability. The recorder used can continuously record the entire process of the heat treatment process.
