SU938024A1 - Method and device for issuing and batching loose finely dispersed ferromagnetic material - Google Patents

Description

(54) METHOD FOR EXTRACTING AND DISPOSING OF BULK

Of a small ferromagnetic material and device for its implementation

one

The invention relates to the dosing of bulk finely dispersed ferromagnetic materials and can be applied in metallurgy, chemical and food industry 15), and teitsk in drying business.

A known method of operation of a metering device using an electromagnetic shutter for controlling the flow rate of a bulk ferromagnetic material, according to Q, but which regulates the flow is achieved by creating a high-gradient magnetic field generated by a solenoid covering the pipe, in which the ferromagnetic material moves.

al ul The disadvantage of the method is the impossibility of creating a magnetic field of high strength throughout the living cross section. nozzle comparable to. field strength - 20 gradient magnetic separators dl. separation of weakly magnetic ores, which makes this method completely ineffective for controlling the consumption of finely dispersed ferromagnetic material with submicron particles due to a sharp decrease in their magnetic density as compared to particles with a size of 0.1 mm, 0 mm, 2 mm. In addition, the method is completely impossible to apply for the dosing of non-magnetic bulk materials.

There is also known a method involving passing a bulk material through a layer of ferromagnetic bodies, for example, spheres made of a hard magnetic material, on which an alternating magnetic field is applied 2.

The disadvantage of this method lies in limiting the magnetic field density, which should not exceed the magnitude of the coercive force of the Material of the spheres, in the formation of a cavity along the central axis of the coenonde, due to the redistribution of ferromagnetic balls in zones with a large magnetic flux, and due to the adhesion of the balls itself due to oCTaiTO4Horo magnetism after pres. digging an alternating magnetic field, this cavity is maintained. All this allows the material to be dosed only in a sufficiently weak manic field, which limits the height of the layer of material to be dosed over the ball layer, and if this height is not kept constant, then the amount of material spilled through the ball layer per unit of time changes with , which excludes precise material dosing. The closest to the invention in terms of technical dryness and the achieved result is the method of improving and dosing the bulk material by changing its viscosity and adjusting the flow area of the flow when vibrated by ferromagnetic bodies placed in an intermittent magnetic field. An apparatus for carrying out this method comprises a housing, a hopper with an outlet nozzle, installed in the upper part of the housing, a working chamber with ferromagnetic bodies, placed in the lower part of the housing, a grid that protects solenoid bodies from falling out of the chamber of ferromagnetic bodies, and a power supply unit connected to a solenoid coil ZO. The disadvantage of this method is that the bodies interlock with each other, are oriented along the magnetic field lines, and adhere to the walls of the salt The enoid, resulting in a cavity in the center of the body, is not blocked by a layer of balls. When the magnetic field is turned off, the dense layer of the dispersed material being dispensed, passing through this cavity, prevents the spheres from returning to their original position, which drastically reduces the metering accuracy of the material. The flow of material through this cavity is uneven, intermittent, and as the height of the layer decreases, it can stop altogether. The purpose of the invention is to increase accuracy. This goal is achieved by the fact that, according to the method, a pulsed magnetic field with a frequency of 0.5–4 Hz and a duration of O, O1 – O, 02 s is created for batch feeding of material, and for a continuous feed of material a pulsed magnetic field with a frequency of 4 -1O G In the device implementing the method, the solenoid of the outlet nozzle is introduced, I reciprocating plate with ROD, two-ring slide bearing, adjustable rod movement stop, rippers, level gauge, core, annular collar, gauge, solenoid of industrial current two magnetic cores, the first of which covers the solenoid of the bunker outlet and slide bearing, and the second solenoids of the working chamber and the industrial current, this reciprocating plate with the rod is located coaxially with the outlet of the bunker, the level gauge and rippers are connected with the rod, the core installed in the center of the working chamber solenoid and the needles are fastened with an annular collar connected to the inner surface of the working chamber; the solenoid of current flow is installed under the grid coaxially with the working chamber The electric power supply unit has a DC bridge, the diagonal of which is equipped with a relay, and one of the arms includes a winding of the level gauge, a thyristor through which the working chamber solenoid is connected to the electrical network, a second thyristor through which the parallel to the working chamber solenoid through the relay the DC bridge is connected to the solenoid pipe, the second relay and the capacitance connected in parallel to it, which are connected to the first thyristor, the third relay and the capacitance connected in parallel to it, which through the second relay connect yucheny to the first thyristor. In this case, the outlet nozzle of the hopper, the outer ring of the sliding sleeve, the core and the annular shoulder are made of a ferromagnetic material, and the housing, the inner ring of the sliding bearing and the spokes are made of a nonmagnetic material. FIG. 1 shows a device that implements the proposed method; in fig. 2 - electric circuit of the device; in fig. 3 - dependence of the rate of hfoseivanie material through, ferromagnetic body from the frequency of a pulsed magnetic field; in fig. 4 — sifting speed of the material depending on the amount of material above the layer of ferromagnetic bodies; in fig. 5 shows the dependence of the ratio of the rate of hfoseivation, the bulk material measured by the additional application of an alternating magnetic field, to the speed measured in the absence of this field. The device contains a non-magnetic body 1 with a grid 2 overlapping the lower part of the body 1, a layer of ferromagnetic bodies 3 above which are outside the body 1

located solenoid 4, which creates a magnetic flux, increasing above the layer of ferromagnetic bodies 3. Under the grid 2, outside the housing 1, there is a solenoid 5, fed by a current of industrial frequency 50 Hz. Outside, the solenoids 4 and 5 are enclosed by the magnetic core 6. The dosed bulk material 7 is loaded into the hopper 8, where through the ferromagnetic nipple 9 with the solenoid 10 enters the ferromagnetic plate 11 placed under this nipple 9 with the rod 12 reciprocating in two annular sliding bearings consisting of an inner non-magnetic ring 13 and an outer ferromagnetic ring 14. The ferromagnetic ring 14 and the solenoid Yu are covered by a magnetic core 15. A stop 16 is mounted on the rod 12. rod movement, made in the form of a nut with a lock nut, and an adjustable level gauge 17, made in the form of a nut with

a lock nut and a winding 18 of a resistance thermometer, At the end of the stem 12, a ripper 19 is installed, made of wires. In case 1, in the center of the solenoid 4, a ferromagnetic annular bead 20 is rigidly attached, in the center of which a ferromagnetic core 22 is mounted on nonmagnetic spokes 21.

The power supply unit (Fig. 2) contains a DC bridge 23 having resistors 24-26 and a level sensor winding 17. In the diagonal of the DC bridge 23, a relay 27 is turned on (L,). The solenoid 4 of the working chamber is included in the electrical network through the thyristor 28 with a capacity of 29, and the solenoid 10 of the nozzle 9 is connected

through thyristor ZO parallel to the solenoid 4. To achieve the required frequency. turn on and off the thyristor 28 1 when it operates in a pulsed mode, a relay 31 (La.) with a capacity of 32, connected in parallel to relay 31 is entered. The pulse thyristor 28 can turn on to be also periodic, for which a block with a relay 33 (L) and a capacitor 34 connected in parallel with relay 33 is introduced.

The device works as follows.

The finely divided ferrite material 7 from the hopper 8 through ferromagnetic pipe 9 enters the body 1, forming a layer located above the layer of ferromagnetic bodies 3. When the thyristor 28 is turned on (Fig. 2),

a coil of a solenoid 4 hphohodit pulse current with a frequency of not more than 10 Hz, long- By the impetus of the pulses which are not spherical O, O2 and Ferromagnetic bodies 3 begin to vibrate with the frequency of the pulses, and they do not interlock with each other. In the absence of dosing material 7 in the magnetic field of these parameters, intense chaotic movement of ferromagnetic bodies 3 takes place. At the same location above the layer of bodies 3 of dosed material 7, the upper part of the layer of bodies 3 emerges in the layer of this material 7 into the region lying half the height of solenoid 4 where the force acts on the bodies of 3, push down. In the center of the solenoid 4, this force is zero. As a result, the forces acting on the upper and lower parts of the layer of the body 3 are balanced and their vibration and the metered material are meteredly reduced. There is a peculiar cork stopping the passage of the dosed material 7 through the layer of bodies 3.

The ascent of bodies 3 and the formation of hfobki are prevented by the flange 2O and the core 22, as a result of which up to a frequency of 12 Hz a cavity in the center of the solenoid does not form. The dispersed material 7 of this is in a chaotic motion, the force is applied to the bodies 3, constantly directed upwards. In this case, the fluidity of the material 7 through the layer of ferromagnetic bodies 3 is dramatically improved.

For accurate dosing, it is necessary to strictly observe the frequency of the pulsed field and the constancy of the level of material 7 above the layer of bodies 3, for which the dosing device is equipped with a vibrating feeder (which operates as follows).

Claims (2)

When the height of the layer of material 7 is reduced, the winding 18 of the level gauge 17 begins to heat up. In this case, the DC bridge 23 is unbalanced, and diagonally; there is a current, including relay 27, whose normally open contacts include the thyristor control circuit 30 and current, leading to the vibratory movement of the rod 12 with the plate 11, flows into the solenoid Yu. Material 7 enters the housing 1 until the gauge 17 is filled up, vibrating with the stem 12, as the winding 18 of the gauge 17 cools down immediately, its resistance drops, the current in the diagonal of the bridge 23 decreases and turnip 27 turns off. The level gauge 17 can be installed at any height on the rod 12. To loosen the pulverized ferromagnetic material 7, the wires loosen l 19 are made of non-magnetic steel. The thyristor 28 operates only when a capacitance 29 is discharged into its amplification circuit, which is charged through the normally closed contacts of the relay 31 when the normally closed contacts of the relay 33 are opened. The capacitance 29 is selected so that it does not discharge in the thyristor control circuit oh, o2 p. By changing the capacitance 32, the frequency control of the relay 31 and, therefore, the frequency of the pulse current going through the solenoid 4 is achieved. When the relay 31 is turned off, the pulse current in the solenoid 4 is pulverized and the dosed supply of the matrix 7 through the layer of bodies 3 stops. It can be automatically resumed when a relay 33 is triggered, for example, when a capacitance 34 of 100 OOF is charged, the dosing device is switched on in 4O s for 10 s. When the material level 7 decreases below the level gauge 17 and the relay 27 is turned on, the normally open contact of which turns on the thyristor control circuit ZO, a pulse current generated by the thyristor 28 flows through the solenoid 10. In the winding of the solenoid 10 a pulsed magnetic field is excited which interacts with the ferromagnetic plate 11, the drive of its vibration motion simultaneously with the material being processed 7, which begins to flow from the plate 11 into 1. The material feed 7 is FOUNDED until the level of measures 17 is immersed in material 7 and volume TCA gauge 18 d 17 cools predetermined temperature balance bridge 23 DC. FIG. 3 curve 1 was obtained in the absence of an alternating magnetic field, curve 2 — with a magnetic field naffing equal to 1O kA / m. Area 1 - material supply nqp-tion 7, areas I and 111, - material supply is continuous. The dashed lines delimit the area in which the various values of the screening speeds are obtained, obtained after switching on the magnetic field of constant parameters - this is the area of unstable material feed. The first zone corresponds to the frequency range of a magnetic field pulse with a duration of 0.01–0.02 s and a frequency of 0.5–4 Hz, a second zone 4–7 Hz, a third 7–10 Hz, and a shaded area 10–50 Hz. In the hatched zone, a cavity is formed in the center of the layers of the body 3 and a sharp decrease in their amplitude occurs; The flow of material through the cavity becomes unstable and jerky. When the frequency of the magnetic field pulses is 2,3,4,5,7 and 1O Hz, with their duration equal to 0, O1 s, and the magnetic field strength of 22O kA / m (Fig. 4), the parameters of the dosage material are the same as in the case described in the first graph (Fig. 3). The plots (Figs. 3-5) also show that the 1-FIF additional taxation of an alternating magnetic field significantly improves the fluidity of the ferromagnetic dispersed material, with the dosage being supplied in a spray form. Lumps of it completely disintegrate, which is important for using such a dosing device in a dust generator or for uniform spraying of material on surfaces. The proposed method and device for its implementation ensure accuracy and stability of dosing, improve the flowability of dispersed material, including poorly flowing material, for example, wet or magnetized. When operating in the frequency range of 3-4 Hz, the proposed method and device for its implementation allow obtaining material in small quantities of portions following one another with the frequency of the magnetic field pulses, and in the frequency range from 4 to 10 Hz non-ferment material feed is provided. The claims 1.Sposob vschachi and dosing bulk particulate ferromagnetic material by altering its viscosity and adjusting u) ohodnogo sectional expiration PPH vibratory voadeystvii f ferromagnetic bodies placed in scheeryvistoe magnetic field exc dv ayushiys in that, in order to increase the accuracy, for a portion of the material supply creates a pulsed magnetic field with a frequency of 0.5–4 Hz and a duration of 0.10.02 s, and for a lagging supply of material a pulsed magnetic field with a frequency of 4–10 Gd is created. 2. Device for the delivery and dispensing of anything else. fine ferromagnetic material, contained a housing, a hopper with an outlet, installed in the upper part of the housing, a working chamber with ferromagnetic bodies, located in the lower part of the housing, 1 deto mesh, fan from falling out of the ferromagnetic heat chamber, a solenoid located at the working chamber, and an electric power supply unit connected to a solenoid coil, characterized in that a solenoid of the outlet branch pipe is inserted into it, a pilot plate with a rod, a double-ring sliding bearing stock, adjustable rod stop, rippers, level gauge, gauge, ring shoulder, spokes, solenoid and two magnetohydrometers, the first of which covers the solenoid of the outlet nozzle and slider, and - solenoids of the working chamber and 1flash current The Ttpa of this reciprocating plate with the rod is placed coaxially with the outlet nozzle of the bunker, the level gauge rippers are connected with the rod, the core is installed in the center of the solenoid of the working chamber and with the help of the spokes fastened to the inner rim The top of the working chamber, an industrial current solenoid is installed under the network coaxially with the working chamber, and the power supply unit has an electric current bridge, a supply cable for the relay, and a winding of the level gauge, a thyristor, and a worm in the electrical network connected the solenoid a working chamber, a trisrischr, through which the working chamber is parallel to the solenoid (through the relay of the direct current bridge the solenoid of the nozzle is connected, the second relay is connected in parallel to the capacitance, the third le, and parallel to the capacitance connected to it, which are in volts (the relay is connected to the thyristor). 3. The device according to p. 2, distinguished by its tek1, that the outlet of the booster, the outer ring of the bearing, with the plate and the collar shoulder are made of a ferromagnetic material, and the case, the inner ring of the bearing and the spokes are non-magnetic. Sources of information taken into account in the examination 1. Authors certificate of the USSR M 562700, cl. F 16 K 31 / O8, 1975. 2. Author's certificate of the USSR N 651835, cl. In O1 F 13/08, B 28 C 7/06, 1976. 3. USSR certificate M 651834, cl. B 01 F 13/08, B 28 C7 / O6, 1976 (1st photo). l ipui.t ABOUT shgo W I, kA / M FIG. five