SU1750730A1 - Suspended electromagnetic iron separator - Google Patents

Description

and reduces the efficiency of the separation process.

The purpose of the invention is to increase the efficiency of the separation process by increasing the intensity of the magnetic field in the separation zone of the suspension electromagnetic separator. ,,

 This goal is achieved by the fact that a suspended electromagnetic chopper containing a frame on which an automatic unloading device is placed, an electromagnetic system containing a U-shaped conduit on which pole tips are located, as well as cylindrical main magnetizing coils and additional ones connected to a constant source. current through the switch. At the same time, a part of the magnetic conductor, located under the additional magnetizing coils, is made with grooves on the surface oriented along the generator of the cylinder.

FIG. 1 shows a suspended electromagnetic separator, a general view; in fig. 2 - magnetic conductor, cross section along the end surface of additional magnetizing coils.

The suspended electromagnetic iron separator comprises a frame 1 on which an automatic unloading device is placed, comprising a drive 2, support rollers 3,4, a pull 5 and a drive 6 drums, a discharge tape 7, an electromagnetic system containing a magnetic core 8, main magnetization coils 9, 10, longitudinal grooves 11, made along the forming magnetic conductor 8, additional magnetizing coils 12.13, gap 14.15 between the main and additional magnetizing coils, pole tips 16.17, and also located under frame separator conveyor 18 for feeding the source material into the separation separation bed, supporting rollers 19, ferromagnetic shunt 20, hopper 21 for collecting ferromagnetic objects.

The device works as follows.

The inclusion of an olecrodigatel 2 sets in motion the driving drum 6, as well as the known drum 5 supporting po-, tl:: and 3.4 and the unloading tape 7 of the device for stgmatic unloading of sep- aration products. The windings of the main coils of a magnetized-0.10 electromotive system,

PS / UPCHMSCH X; . PERMANENT POSITIONAL,;::; then create m-nigoi ipg., | 1ro:, .. | D schichi through ms and ipods B and snapping through pole tips 16,17. The magnetic field created in the work area allows you to extract some of the ferromagnetic objects placed in

separable material, which are evacuated by means of flexible tape 7 into bunker 21. Additional electromagnetic coils 12, 13, located on the same magnetic line 8 with main coils 9.

10. separated by gaps 14.15. The generator generates voltage pulses for supplying additional magnetizing coils. The additional component of the magnetic flux flux, created by additional magnetizing coils operating in pulsed mode, makes it possible to increase the strength of the magnetic field in the working separation zone of ferromagnetic objects.

magnetic induction generated by the main magnetizing coils 9.10 and additional coils 12,13 coincides with the longitudinal axis of the cylindrical part of the magnetic circuit, on which

coils. Since the operation mode of the additional magnetization coils 12.13 is pulsed, eddy currents occur on the surface of the magnetic circuit 8 located under these coils,

directed perpendicular to the magnetic flux passing through the magnetic conductor 8. Longitudinal grooves are made along the forming magnetic conductor. Such an embodiment of the magnetic circuit does not allow the eddy currents to be seen along the contour on. the surface of the magnetic conductor, which, in turn, concludes the superheat of the magnetic circuit, the magnetization coils and reduces the magnetic flux losses through the magnetic conductor,

Since the frequency of the supply pulses of the additional magnetizing coils is quasi-constant (5-10 Hz), the penetration depth of the eddy currents is small and almost all eddy currents

induced on the surface of the magnetic circuit. Therefore, the depth of the grooves made on the side surface of the magnetic circuit along its generatrix is also insignificant.

The intensity of the magnetic field created by the main coils ngmzgnichai chiaani Hi and additional coils of magnetization On can be determined by the formula

HHi -Ni / fcpi: (1)

 -M2 / HS2. (2)

where li, z is the supply current of the main and additional magnetizing coils, respectively;

G, N2 is the number of turns of the main and additional magnetizing coils;

tcpK fcp2 is the average length of the magnetic field line.

Since the magnetization coils are located on the same magnetic core, cpi, Cp2,. and the ratio of hcp2 H2 / Hi zl is the gain of the magnetic field of the main magnetizing coils by additional

 Ј tt ° -78-

Thus, in the claimed iron separator, the magnetic field strength is increased by 78% compared with the serial and basic iron separator.

The power of heat sources for a closed continuous electromagnet, on which the magnetization coils are located, can be determined by the formula

P (2.9 ... 3.25) lO iN / kp) 53 F f. (4) where I is the supply current of the magnetizing coils, 60 A;

N is the number of turns of the coils, 500 pcs;

liP is the average magnetic line of force, 1.5 m;

F- side surface of the magnetic circuit, 0.175 m2;

f-frequency ripple magnetic field, 10 Hz.

According to formula (4), the power of heat sources for a continuous magnetic circuit is (1.59-1.78) 103 watts.

Since the depth of the grooves on the lateral surface of the magnetic circuit is greater than the penetration depth of the electromagnetic wave, such a magnetic core can be calculated as a closed loop by the formula

Jl 3.

five

R-Rud - M. (5)

where Ore is the specific loss determined by the application schedules, equal to 0.5 W / kg;

5M is the mass of the bushing, 100 kg.

The power of heat sources for the magnetic circuit, on which the grooves are made, is 50 W.

Calculations show that the execution

The 10 grooves on the surface of the magnetic circuit allows reducing the amount of heat generated in the magnetic core, on which the magnetization coils are located 31–35 times as compared to a solid-cast magnet circuit with a solid cross section. This allows an increase in the supply current of the magnetizing coils.

The use of the invention makes it possible to increase the efficiency of the separation process by increasing the intensity of the magnetic poly in the working area of the separator by reducing the heating of the magnetic circuit, the magnetization coils and reducing the loss of magnetic flux.

5 in the magnetic circuit.

Claims (1)

Claims of the invention A suspended electromagnetic iron separator, including a magnetic core with pole pieces, on which is fixed with a gap between them the central main coils and the additional ones connected to the power source through a switch that differs from one another. increase 5 the efficiency of the separation process by increasing the intensity of the magnetic field in the working area, part of the magnetic circuit, - covered by additional coils, is made with grooves oriented along 0 forming a cylinder. t t 4 VZV A - A FIG. 2 eight