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3-1 Solenoid Sensor Parameter Calculation
Determination of the main dimensions of 3-1-1 solenoid sensor
1, sensor inner diameter D1
The choice of the inner diameter D1 of the inductor is mainly based on the following considerations:
In order to obtain high electrical efficiency ηu, a smaller D1/D2 value should be used as much as possible.
Generally take D1/D2=1.5~2.5 (3-1)
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2, sensor length a1
The ratio of the heating time tK of the blank in the inductor to the beat t is n, and n is the number of blanks in the inductor.
n = (3-4)
A2=n a2' (3-5)
Where: a2' - the length of a single piece of blank.
A2 —— The total length of the blank in the inductor coil.
When n=1, that is, tk=t, it is called periodic heating. This is a method of simultaneously heating a billet.
When n >1, tk>t, in two cases, one is step heating, usually using a pusher machinery to feed the blank into the sensor at a certain tact;
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2. Determination of frequency, power and heating time (1) Frequency:
From the formula (2-4), the frequency range: 104 ~ 208Hz, select 200Hz
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3. Determination of sensor size D3=0.235m
If a solid guide rail is used, D3=0.205m (about 1.2 times D2) can be taken. Due to the water-cooled guide rail, considering the temperature difference between the upper and lower billets, 0.235 m is selected.
D1=D3+2δ=0.235+2×0.0175=0.27m
δ is the wall thickness of the furnace lining, which is 0.0175 m.
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4. The design idea of ​​the solenoid variable pitch sensor is to simplify the design and design according to the thermal specification under the equal spacing condition, that is, calculate the resistance r 2 and the reactance x2m of the blank according to the hot state specification, and then adjust the coefficient ( r 2'=1.65 r 2, x 2m'=1.15x 2m).
The equal pitch parameter is calculated, then a1 is segmented according to a certain ratio, and the total number of sensors obtained is also distributed to each segment according to a certain ratio, that is, the variable pitch coil design.
The empirical distribution ratio of coil length and number of turns with variable lay length is as follows:
Table 3-1 Variable lay length coil length and number of experience distribution ratio table......
5. The design and parameter calculation of the reference sensor mainly refer to the following documents:
(1) Tang Jingming • “Induction Heating Technology Application and Equipment Design Experience†• Beijing • Machinery Industry Press • 1975
(2) [Russian] AE Slohotsky, CE Reskin. "Calculation and Design of Induction Heaters" • translated by Jiang Limin • 1980, Example of Solenoid Sensor Parameter Design*
It is known that the rated power of the thyristor intermediate frequency inverter is 2000kW, the standard frequency is 200Hz, the incoming line voltage is three-phase 660V50Hz, and the intermediate frequency voltage is 1160V. The inductor and the electric heating capacitor form a parallel resonant circuit. The diameter of the inductor coil is D1=0.27m, the length of the inductor coil is a1=a2=7.2m, the material of the blank is C38+N2 (non-tempered steel), the blank specification is φ0.17×0.935m, and the mass is 166.598kg. Average calculated diameter D2'= D2-â–³ï«=0.130m, initial forging temperature: 1200°C±30°C, heating beat: 115s, heart surface temperature difference: ≤30°C
Specific steps are as follows:
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3-2 Promotion and application of parameter calculation of solenoid sensor
1. Calculation of hot-state low-end temperature sensor parameters of steel billet Forging of steel billet is defined as hot forging according to the initial forging temperature, and 850 °C to 1000 °C is sometimes referred to as hot low-end temperature. When calculating this temperature segment sensor, there are two places that should be adjusted:
1 Heating time should be calculated according to formula (2-15). The actual heating time is shorter than the time calculated by the simplified formula described in Sections 2-4.
2 The adjustment factor of the blank resistor r2 and the reactance x2m should be changed, that is, the calculated value is r2'=2.40 r2, x2m'=1.68 x2m.
The rest is calculated the same as the sensor for hot forging high temperature.
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The following is a brief introduction: the selection of the rectifier transformer and the configuration of the inverter, the influence of the inverter as a harmonic source on the harmonic current of the utility grid or the generation of harmonic voltage in the utility grid and the suppression measures.
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