Luoyang Judian Metal Hot Processing Equipment Co., LTD is mainly engaged in the manufacture of complete sets of equipment in the metal thermal processing industry and the integration of the entire production line.
The hydrogen-protected medium-frequency induction sintering furnace is mainly used for high-temperature sintering of refractory metals such as tungsten and molybdenum under hydrogen protection. It adopts program control, manual or automatic temperature measurement to ensure accurate control of the furnace temperature, and has multiple protection functions such as overvoltage, overcurrent, water shortage, and phase shortage. The furnace temperature can reach 2300℃, the power cabinet output frequency is 2500 Hz, and the output power is 400 kilowatts.
This equipment is suitable for modern equipment that uses the medium-frequency induction heating principle for metal heat treatment under hydrogen. The heating of this product is an AC-DC-AC static frequency conversion device, which converts 50Hz three-phase industrial frequency power into single-phase medium-frequency power. This series of equipment uses the principle of electromagnetic induction to place the workpiece in an alternating magnetic field under a protective gas environment, generating eddy current loss and heat, and meeting the requirements of sintering, heat penetration, etc. This heating method has the characteristics of fast heating, less burning loss, low labor intensity, and can ensure product quality.
Hydrogen Induction Sintering Furnace
Main technical parameters:
a) Rated working power 3N 380V±20V, 50Hz±1Hz b) Rated heating power about 400kw (actual heating power is steplessly adjustable) c) Rated working furnace temperature 2350℃ (design furnace temperature 2400℃) ≤20℃/min d) Temperature control accuracy of heating rate instrument ≤±2℃C f) Temperature measurement method 0-1000℃ Thermocouple (automatic delivery type) 1000-3000℃ Infrared G Temperature control method: manual control and intelligent program control (heating according to a given heating curve) h) Temperature recording: small long chart recorder records temperature and industrial control computer data records i) Working atmosphere: hydrogen (hydrogen flow rate is not less than 20m³h, pressure is not less than 0.04MPa.) j) Protective atmosphere: nitrogen (pressure is not less than 0.04MPa) k) Heating element specifications 600×1150 tungsten) vertical L) Furnace type discharge method: upper discharge Mechanical (automatic screw type, feeding and discharging mechanism) Feeding and discharging mechanism speed 0.5-1.2m/min (speed variable frequency adjustable, automatic stop after reaching the position) Mechanical track type (acceleration and deceleration time adjustable to ensure stability) v) Furnace body outer surface temperature rise ≤30℃ w) Cooling water rated pressure 0.1~0.3M Pa x) Cooling water flow: 25 m3/h y) Compressed air pressure 0.4-0.6 MPa z) Medium frequency heating parameters: ●·Rectification mode: three-phase full-controlled bridge rectification ●·Protection mode: overcurrent, overvoltage rectification pull inverter protection; cut-off, power blocking protection ●·Relay protection; RC, LC absorption protection, fast fuse protection ●·Furnace temperature overheating, over-adjustment protection, temperature sensor fault protection ●·System water shortage, water shortage, water temperature overheating and water pressure over-high protection ●·Protection of protective gas underflow Power adjustment mode: ·Manual mode; ●·PID adjustment, automatic working mode along the specified heating curve (user specified).
Principle, structure and characteristics This equipment consists of a furnace body, an electrical control system, a medium frequency heating system, an inflation system, a water cooling system and other parts. This equipment is a heat treatment equipment using medium frequency induction heating. A spiral tubular coil is installed inside the furnace body. When the coil is passed with medium frequency current, an alternating magnetic field is generated. Under the action of the magnetic field, the metal charge induces an electric potential and generates a circular current. Under the action of its own magnetic field, this current is concentrated in the outer layer of the metal charge, so that the outer metal charge has a very high current density, thereby generating a concentrated and powerful thermal effect, which has heated the metal and caused the furnace to produce a high temperature of up to 2400℃.
2.1 Furnace body ●·The furnace body is a vertical single-chamber water-cooled jacket structure, and the furnace door is a double-door structure with upper and lower openings. It adopts a sandwich water-cooled jacket, the inner layer is made of stainless steel sUS304/δ=10mm, the outer layer is made of stainless steel SUS304/6=8mm, and the flange material at both ends is stainless steel plate SUS304/δ=35mm. The inner surface of the furnace body is finely polished to improve the vacuum degree of the equipment. The furnace body is equipped with observation holes, air inlets, vacuum, combustion ports, explosion-proof holes, electrical interfaces, etc. All interfaces are connected by vacuum O-ring flanges.
●·The furnace chamber is composed of an induction coil, a high-temperature insulation layer, a high-temperature heat insulation screen, a high-purity crucible, etc. from the outside to the inside. The inner wall of the vacuum chamber is equipped with an active
●The insulation material is made of alumina bricks, which can withstand temperatures above 1800 degrees. The material density is about 5.0g/cm3; the thickness is about 60mm
●·The high-temperature insulation layer uses zirconia heavy bricks, which can withstand temperatures above 2400 degrees. The material density is about 2.0g/cm3, the purity ZrO2≥99%, and the thickness is about 40mm.
●·The upper furnace cover is an upper opening structure. When the furnace cover is opened, the furnace cover self-locking device is released, the electric reducer drives the furnace cover to rise, and then the furnace cover is manually rotated, and then the material is loaded and unloaded from the upper furnace mouth.
●·The upper position of the furnace body is designed with a workbench, and the steel structure work platform surrounds the furnace body. The platform is equipped with convenient stairs and protective guardrails.
2.2 Power supply The heating power supply system can be completed automatically by the program. The operator only needs to call out the stored heating process curve before starting the machine and put it into operation. The system will fully display and record the current temperature status of the heating process.
●·The medium-frequency power supply can be set for automatic-manual conversion; remote-local control conversion can be set.
●·Good starting performance: This device adopts the "zero-pressure" starting mode, and the starting current rises smoothly from small to large, without any impact on the power grid and other electrical equipment.
●·Strong protection function: This device has overcurrent protection, overvoltage protection, and fast resistance-capacitance absorption protection of thyristor forward and reverse instantaneous overvoltage.
●·Quick fuse protection, current cutoff and pressure cutoff protection, cooling water underpressure protection, phase loss protection and other protection functions.
●·Main control board: The rectifier trigger part is controlled by AC63S programmable device, which has high reliability, good pulse symmetry, strong anti-interference ability and fast response speed. The inverter adopts the sweep frequency zero-pressure starting mode, and the starting performance is better than the ordinary zero-pressure soft starting circuit. It has the function of automatic repeated starting.
2.3 Inflatable gas circuit system ●Nitrogen and hydrogen gas are sent out from the gas collecting bottle, and after passing through the flowmeter and pressure gauge equipped with this equipment, they enter the furnace body through the electromagnetic inflation valve. High and low pressure alarm devices are set at the hydrogen inlet and outlet. The dew point temperature detection is designed on the hydrogen inlet side equipment to effectively detect the hydrogen pressure.
●After the hydrogen passes through the furnace, it is led out to the exhaust port at the bottom of the furnace body. A water seal is set from the exhaust port to the combustion port, so that the size and flow rate of the gas bubbles can be intuitively seen.
●The tail gas treatment method is manual explosion and ignition.
●The equipment is designed with an emergency conversion device for the hydrogen/nitrogen supply system, which is automatically switched through a pneumatic solenoid valve.
