[0001] The utility model belongs to the field of permanent magnet materials, and relates to a liquid outlet control device of a neodymium iron boron intermediate frequency induction furnace.
Background technique
[0002] Rare earth oxides refer to 15 kinds of lanthanide oxides with atomic numbers 57 to 71 in the periodic table ,
And scandium (Sc) and yttrium (Y) , which are chemically similar to lanthanides, are oxides of 17 elements. According to the original rare earth element
The structure and physical and chemical properties of the sub-electron layer, as well as their symbiosis in minerals and different ionic radii can produce different
The characteristics of the nature, seventeen rare earth elements are usually divided into two groups: light rare earths include: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium. weight
Rare earths include: terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium.
[0003] Neodymium iron boron rare earth permanent magnet materials, with their excellent magnetic properties, are getting more and more applications and are widely used in medical
MRI, computer hard drives, audio, mobile phones, etc. With the requirements of energy saving and low carbon economy, NdFeB is rare
Earth permanent magnetic materials have begun to be used in auto parts, household appliances, energy-saving and control motors, hybrid vehicles, wind power generation, etc.
Field application.
[0004] Refractory materials are a class of inorganic non-metallic materials with a refractoriness of not less than 1580 ° C. Refractoriness refers to the refractory cone
The shape sample resists the effect of high temperature without softening the melting Celsius temperature without load. Refractory materials are widely used
Metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, power and other industrial fields, the largest amount in the metallurgical industry. Of total output
50% ~ 60% .
[0005] Electric furnaces that utilize the induction electrothermal effect of materials to heat or melt the materials are called induction furnaces. Induction furnace
There are three types of AC power supply: power frequency (50 or 60 Hz ) , intermediate frequency ( 150 to 10000 Hz) and high frequency (above 10000 Hz) . sense
The main components of the furnace are the sensor, furnace body, power supply, capacitor and control system. The action of alternating electromagnetic field in induction furnace
Under the vortex flow, the material is heated or melted. Under the stirring action of this alternating magnetic field, the furnace material
The quality composition and temperature are relatively uniform, forging heating temperature can reach 1250 ℃, melting temperature can reach 1650 ℃. Induction furnace dissipation
In addition to heating or smelting in the atmosphere, it can also be heated or smelted in a protective atmosphere such as vacuum and argon, neon, etc.
Claim. Induction furnaces are used in diathermy or smelting of soft magnetic alloys, high-resistance alloys, platinum group alloys, heat-resistant, corrosion-resistant, wear-resistant alloys and pure gold
The aspect has outstanding advantages. Induction furnaces are generally divided into induction heating furnaces and melting furnaces.
[0006] Intermediate frequency induction furnace is a power supply that converts 50HZ AC power frequency to medium frequency (over 300HZ to 20K HZ)
The device converts the three-phase power frequency alternating current into rectified DC, and then changes the DC into an adjustable intermediate frequency current, which is supplied by
The intermediate frequency alternating current flowing in the capacitor and the induction coil generates high-density magnetic field lines in the induction coil and cuts the induction coil
The metal material contained in it creates a large eddy current in the metal material. This eddy current also has some characteristics of intermediate frequency current
quality. That is, the free electrons of the metal itself flow in the metal body with resistance to generate heat.
[0007] Electric valves are usually composed of electric actuators and valves. The working principle of the electric valve is: driven by the motor
The deceleration device produces linear motion or angular rotation motion under the action of electrical signals. So as to achieve the switch to the pipeline medium
purpose. The advantages of electric valves are: high stability, constant thrust, and good resistance to deviation.
[0008] Servo motor (servo motor) refers to the motor that controls the operation of mechanical components in the servo system, is a
Subsidiary motor indirect transmission. The servo motor can control the speed and the position accuracy is very accurate, and can convert the voltage signal
It is the torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can react quickly.
In the dynamic control system, it is used as an actuator, and has the characteristics of small electromechanical time constant, high linearity, starting voltage and so on.
The received electrical signal is converted into angular displacement or angular velocity output on the motor shaft. Divided into two major DC and AC servo motors
The main feature of the class is that there is no rotation phenomenon when the signal voltage is zero, and the rotation speed decreases at a constant speed as the torque increases.
[0009] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments, which directly measure the temperature and convert the temperature signal
The thermal electromotive force signal is converted into the temperature of the measured medium by an electrical instrument (secondary instrument). The appearance of various thermocouples
Often they are very different due to needs, but their basic structure is roughly the same, usually by the hot electrode, insulating sleeve protection tube and connection
The main components, such as the wire box, are usually used in conjunction with display instruments, recording instruments and electronic regulators.
[0010] Single-chip microcomputer referred to as single-chip microcomputer, is a typical embedded microcontroller (Microcontroller
Unit) , the commonly used abbreviation of the English alphabet, MCU stands for Single Chip Microcomputer, which was first used in the field of industrial control. Current MCU
Penetrating into all areas of our lives, it is almost difficult to find which area does not have traces of single chip microcomputers. SCM is based on the program
Run and can be modified. Different functions can be realized through different programs. Through the program, it is convenient to use a single chip microcomputer
Control the speed of the motor. Through the program, high intelligence, high efficiency, and high reliability of the product can be achieved.
[0011] In 1982 , Sumitomo Special Metals Corporation of Japan first disclosed the Japanese patent for NdFeB rare earth permanent magnet materials
1622492 and 2137496 , immediately applied for US patents and European patents, announced the characteristics of NdFeB rare earth permanent magnet materials
Sex, ingredients and manufacturing methods. 2007 Nian 4 Yue 1 Ri Japan's Hitachi Metals and Sumitomo merged, and inherited the Sumitomo Metal
The 2007 Nian 4 Yue 1 rights and obligations of patent NdFeB rare earth permanent magnet licensed day.
[0012] Santoku Metal Industry Co. 1997 years . 1 dated 31 is filed the patent disclosure made "thin solidified alloy
Manufacturing equipment and manufacturing method of thin solidified alloy ", patent number: ZL97192034.6 . Patented equipment is equipped with top
Container for opening and containing alloy melt, drive mechanism for pouring the container, control device for controlling the drive mechanism,
The gold melt is cooled and solidified to form a thin strip-shaped cooling drum, and the alloy melt is guided to the cooling drum with a substantially constant flow
Liquid flow stabilization mechanism; the aforementioned control device is provided with a memory that stores a tilting angular velocity command for pouring the container, and reads in
A command device for tilting angular velocity command and operating the drive mechanism according to the command. The tilting angular velocity command is selected
The theoretical amount of the alloy melt remaining in the container when the pouring angle of the container is determined by a predetermined number
So that the alloy melt flows out in a certain amount.
Summary of the invention
[0013] In the existing NdFeB alloy melting crucible, the alloy melt outlet is opened at the top, and its typical representative is the invention.
Use the crucible described in "Manufacturing Apparatus and Manufacturing Method of Thin Solid Alloy", using such a crucible
When pouring the alloy melt, a dumping drive mechanism, a tilting angular velocity sensor, and a control device for controlling the drive mechanism are required
The volume of these devices is huge, and the cost is high. At the same time, the alloy melt can only flow out in a certain amount, and the flow rate cannot be stabilized.
Affect the cooling and subsequent operations of the alloy melt. The purpose of this utility model is to design a simple structure, easy to use,
The low-cost NdFeB medium-frequency induction furnace liquid outlet control device sets the alloy melt outlet of the smelting crucible below and uses
The electric valve controls the opening and closing of the liquid outlet, which solves the shortcomings of the existing smelting crucible liquid outlet at the top, reducing the installation
The prepared volume reduces the cost of the equipment and improves the stability of the molten alloy effluent.
[0014] In order to achieve the above purpose, the utility model includes: a melting crucible (1) , a heating coil (2) , an electric valve servo motor
(3) , electric valve (4) , thermocouple (5) , single chip microcomputer (6) , characterized by: the melting crucible (1) is a cylindrical container,
The top of the melting crucible (1) is a top cover that can be opened, and the ingot of NdFeB alloy can be put in from the top cover of the melting crucible (1) ,
Heating coil (2) wound around the melting crucible (1) an outer cylindrical side surface, melting crucible (1) center of the bottom play a circular hole, electrical
The moving valve (4) is embedded in the center circular hole of the bottom surface of the melting crucible (1) , and the electric valve servo motor (3) is installed in the melting crucible
Crucible (1) the lower end of the bottom surface of the melting crucible (1) is foraminous cover, a thermocouple (5) of the melting crucible from (1) a cover apertures
Embedded in the smelting crucible (1) . The single chip microcomputer (6) is placed as a controller three meters away from the melting crucible (1) .
[0015] The electric valve valve (4) manufacturing material melting point should be higher than 1580 degrees Celsius.
[0016] The voltage signal output by the thermocouple (5) is sent to the microcontroller (6) for processing, and the microcontroller (6) will process the
The signal is sent to the electric valve servo motor (3) , and the electric valve servo motor (3) controls the opening and closing of the electric valve valve (4) .
BRIEF DESCRIPTION
[0017] FIG. 1 is a schematic structural view of a liquid outlet control device of an NdFeB medium frequency induction furnace;
[0018] FIG. 2 is a signal processing block diagram of a liquid outlet control device of a neodymium iron boron intermediate frequency induction furnace;
detailed description
[0019] The specific implementation of the present invention will be described in detail below with reference to the drawings.
[0020] See FIG. 1 Schematic diagram of the control device of the liquid outlet of the neodymium iron boron intermediate frequency induction furnace. The liquid outlet of the neodymium iron boron intermediate frequency induction furnace
The port control device consists of melting crucible (1) , heating coil (2) , electric valve servo motor (3) , electric valve valve (4) , thermocouple
(5) , composed of single chip microcomputer (6) , the melting crucible (1) is a cylindrical container, the top of the melting crucible (1) is a
The open top cover, NdFeB alloy ingot can be put from the top cover of the melting crucible (1) , and the heating coil (2) is wound around the melting crucible (1)
Outside the cylindrical side, a circular hole is punched in the center of the bottom surface of the melting crucible (1) , and the electric valve (4) is embedded in the bottom of the melting crucible (1)
Circular hole in the center plane, the servo motor electric valve (3) mounted on the melting crucible (1) the lower end of the bottom surface of the melting crucible (1) is
Foraminous cover, a thermocouple (5) from the melting crucible (1) is embedded in the melting crucible orifice in the cap (1) inside. Monolithic
The machine (6) acts as a controller and is placed three meters away from the melting crucible (1) .
[0021] The electric valve valve (4), the manufacturing material melting point should be higher than 1580 degrees Celsius.
[0022] Refer to FIG. 2 is a signal processing block diagram of the liquid outlet control device of the neodymium iron boron intermediate frequency induction furnace.
In the furnace liquid outlet control device, the voltage signal output by the thermocouple (5) is sent to the single-chip microcomputer (6) for processing, and the single-chip microcomputer (6)
Send the processed signal to the electric valve servo motor (3) , the electric valve servo motor (3) controls the opening of the electric valve valve (4)
With closed.
[0023] In use, the melting crucible (1) is put into the dissolution chamber as a furnace body, and the ingot of NdFeB alloy can be removed from the upper part of the dissolution chamber
The raw material addition chamber is put in through the top cover of the melting crucible (1) . After putting in the neodymium iron boron alloy ingot, the heating coil (2) passes through the intermediate frequency.
The variable current heats the neodymium iron boron alloy ingot. After heating to a certain temperature, the single-chip microcomputer (6) sends out a control signal and sends it to the electric valve.
Servo motor (3) , electric valve servo motor (3) controls the opening of electric valve valve (4) , NdFeB alloy liquid in molten state
After flowing down through the electric valve (4) , the alloy liquid is processed by equipment such as cooling to form alloy flakes.
[0024] The above-mentioned dissolution chamber, raw material addition chamber, intermediate frequency alternating current generation equipment, single-chip microcomputer control system, alloy liquid cooling
But the equipment and so on already have very mature technology.