Device for measuring the level of liquid metal in the movable mold

 

The invention relates to the measuring of the level of the melt and can be used in the metallurgical industry, in particular in installations engaged in the welding of the metal surface layer on a cylindrical part. Device for measuring the level of liquid metal in the movable mold includes upper, intermediate and lower forming an annular section of insulating layers separating these two sections, the first and second analog-to-digital converters, calculation of the indicator device. In the insulating layers are installed respectively in the first and second sensors capacity, made in the form of a rod of conductive refractory metal. One end of the rod immersed in the slag bath. The second end of the first rod is connected to one input of the first analog-to-digital Converter, to the second input of which is connected the outlet to measure capacity, made in the lower shaping ring section. The second end of the second rod has an output that is connected to one input of the second analog-to-digital Converter, to the second input of which is connected to the output of the first rod. The output of the first analog-to-digital Converter connected to the first input of the settlement-ind the Technical result consists in increasing the accuracy of measuring the level of molten metal in the mould. 2 Il.

The invention relates to the measuring of the level of the melt and may find application in the metallurgical industry, especially in installations engaged in the welding of the metal surface layer on a cylindrical part.

Known mold for surfacing containing annular section located in height; the top section is current and has a through groove located below the intermediate section is trimmed from the current-carrying section of the insulated strip and located even lower forming section is separated from the intermediate section of the insulating gasket. Current lead exercise to one end of the upper feed cut sections on the border with the groove and to the lower end of nagusame details. Under the action of electromagnetic forces resulting from current flow through the slag bath, there is a rotation of the slag bath. Particles of molten metal fall down and form a metal bath of liquid metal, which gradually crystallizes, aplauses to detail [1]. In this device the control of the level of liquid metal is carried out by immersion of the probe into the slag bath to provodnosti level measurement of liquid metal and the inability of the automatic registration of measurement.

Known transmitter containing a reversible motor with a control circuit, a matching unit, lead screw with a bracket, connected with the dipstick and engine rekorda, and the control circuit is made in the form of a phase modulator connected to the one input of the Converter phase shift, the other input of which is connected to a sinusoidal signal generator, and the inverter output phase shift is connected to one input of the switch, the other input connected to the synchronization unit, one output of the switch is associated with a reversible counter, sequentially connected to one input of the first differential amplifier, the other input of which is connected to the first unit, and the other output of the switch is associated with a pulse counter connected to one input of the second differential amplifier, the other output of which is connected with the second unit, and the outputs of the circuits of comparison is connected through serially connected to the trigger control and a matching unit for reversing the motor [2].

The disadvantages of the known device is its complexity, because the necessary element is a reversible motor with automatic control system, in addition, the device does not provide a measurement of the level respectueuse level control, containing a sensor in the form of a rod, immersed in a controlled environment and is connected to a high-frequency Converter [3].

The disadvantages of the known device is its complexity and lack of reliability due to the necessity of using high-frequency transducer, and the lack of accuracy of the measurement, if over-controlled environment is molten slag environment.

The challenge which seeks a technical solution - improving the accuracy of measuring the level of molten metal in the mould.

This object is achieved in that the device for measuring the level of liquid metal in the movable mold comprising upper current-carrying circular section, an intermediate annular section and a bottom forming an annular section in the insulating layer separating the upper current-carrying circular section and an intermediate annular section taken through hole, which has the first potential sensor is executed in the form of a rod of conductive refractory metal, one end of which is immersed in the slag bath, and its second end has an output that is connected to one input of the first analog-to-digital PR is yuusei ring section. In the insulating layer separating the intermediate annular section and a bottom forming an annular section, taken on the same vertical line with the first hole of another through hole, which has a second potential sensor is executed in the form of a rod of conductive refractory metal, one end of which is immersed in the slag bath, and its second end has an output that is connected to one input of the second analog-to-digital Converter, to the second input of which is connected to the output of the first rod, the output of the first analog-to-digital Converter connected to the first input of the calculation of the indicator device, to the second input of which is connected the output of the second analog-to-digital Converter.

The presence of two isolated sensors capacity, immersed in the slag bath at different distances from the metal surface, allows to determine the tension between them and the tension between one sensor and a forming section in contact with the liquid metal, which improves the accuracy of measuring the distance between the top sensor and the surface of the liquid metal.

In Fig.1 shows a diagram of a movable cylindrical mold for fusing surface layer of the metal rastrojstvo level measurement of liquid metal.

Device for measuring the level of liquid metal in the movable mold includes a metal cylindrical part 1, on which is deposited surface layer of the metal, the movable mold consisting of an upper current-carrying annular section 2 having an axial slit in which is installed insulation gasket to one end in the cutting feed section 2 is connected to one output of the power source 3, the second terminal of which is connected to the lower end of the fuse parts. Below the annular section 2 of the mold is placed the end of the insulating strip 4, it is made a through hole, which features a core 5 made of a conductive refractory metal such as tungsten. Below the annular insulating gasket 4 is placed intermediate annular section 6, and below it posted by another annular insulating gasket 7, there is a through hole, which features a rod 8 made of refractory metal such as tungsten. Below the annular insulating gasket 7 is installed forming section 9, which made the outlet 10 for measuring potential. The space between the mould and the sheet 1, which naplavlyaemoy bath 11, and in the upper part of the melt is conductive slag bath 12 through which welding current flows. One end of the rod 5 is immersed in the slag bath 12, and its other end has an output connected to one input 13 of the first analog-to-digital Converter 14, the other input 15 which is connected to the outlet 10 for measuring the capacity of the lower forming an annular section 9. One end of the rod 8 is immersed in the slag bath 12, and its other end is connected to one input 16 of the second analog-to-digital Converter 17, the other input 18 which is connected to the output of the second end of the rod 5. The digital output of the first analog-to-digital Converter 14 is connected to the first input of the calculation of the indicator device 19. The digital output of the second analog-to-digital Converter 17 is connected to the second input of the calculation of the indicator device 19.

The device operates as follows. When turning on the power supply 3 voltage is applied to one end of the upper feed cut ring section and the lower end of the fuse parts. Therefore, between any point of the upper feed section 2 and the fuse-part 1 there is a potential difference, and through the current-carrying slag bath 12 flows elektricheskaya down below the level of the intermediate ring sections 6 and below the upper edge forming an annular section 9. Forming an annular section 9 is cooled, so the liquid metal 11 is crystallized. All sections of the mold are gradually lifted up and into the slag bath 12 is continuously added to the filler material in the form of a fraction. The upper level of the liquid metal bath 11 should not reach the bottom level of the intermediate annular section 6, because otherwise there may be a breakthrough of liquid metal from the mould.

Electric resistance welding of the material of the slag bath 12 significantly, by more than two orders of magnitude, greater than the electrical resistance of the liquid metal 11 and the metal surfaced articles 1. Therefore, almost all the voltage of the power source 3 is applied to the material located in the slag bath 12.

If we assume that the ring section 2 summarized the positive potential relative to the potential connected to the lower end of the surfaced part 1, in the upper part of the slag bath is the greatest potential, and in the lower part of the slag bath level of molten metal will be the least potential. All of the ring sections 2, 6 and 9 of the mold made of copper, with a small the E. measuring the potential difference can be neglected. Therefore, it can be assumed that the potential of the section 9 is equal to the potential on the surface of the liquid metal bath 11.

In Fig.2 the distance between terminals 5 and 8 are immersed in the slag bath 11, denoted by h1and the distance between the rod 5 and the liquid metal level denoted by hm. Since in accordance with the physical processes occurring in the mould and is described in [1], the slag bath is in constant rotation, the welding material is constantly mixed and is uniform throughout the depth of the slag bath 12. Therefore, there is a linear relationship between the distance hmfrom the upper level of the liquid metal 11 to the point in the slag bath 12, which is the measuring rod 8 or 5, and the potential difference U1between the level of the liquid metal and the point, where is the measuring rod. Consequently, the fair dependency

where U1the potential difference between the terminal 5 and the casing 10 from the forming ring section 9, have the same potential as the liquid metal 11;

U2the potential difference between terminals 5 and 8.

Analog-to-digital converters 14 and 17 allow us to determine the difference between potential distancemfrom the surface of the liquid metal to the measuring rod 5 and presents the information in digital form.

This device has a higher measurement accuracy than other known devices. For example, when the power supply voltage source 3 is a simultaneous proportional to the change in the potential difference U1and U2that determines the correctness of the calculation of the distance hmby the formula (1).

Bibliography

1. RF patent №2174154. The mold for electroslag welding. MCI 22 IN 9/193, B 23 K 25/00. 27.09.2001. Bull. No. 27.

2. Author's certificate of the USSR No. 1093906. The level gauge. MCI G 01 F 23/24. 1984. Bull. No. 19.

3. Patent Austria No. 210163, CL 42 e 11, 1960.

Claims

Device for measuring the level of liquid metal in the movable mold containing the sensor in the form of a rod, immersed in a controlled environment, characterized in that the mould containing the upper current-carrying circular section, an intermediate annular section and a bottom forming an annular section in the insulating layer separating the upper current-carrying circular section and an intermediate annular section taken through hole, which has the about immersed in the slag bath, and its second end has an output that is connected to one input of the first analog-to-digital Converter, to the second input of which is connected the outlet to measure the potential, are in the bottom forming a circular section, and an insulating layer separating the intermediate annular section and a bottom forming an annular section, taken on the same vertical line with the first hole of another through hole, which has a second potential sensor is executed in the form of a rod of conductive refractory metal, one end of which is immersed in the slag bath, and its second end has an output, which is connected to one input of the second analog-to-digital Converter, to the second input of which is connected to the output of the first rod, the output of the first analog-to-digital Converter connected to the first input of the calculation of the indicator device, to the second input of which is connected the output of the second analog-to-digital Converter.

 

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FIELD: metallurgy, namely production of thin steel sheet from thin cast strip.

SUBSTANCE: method is realized due to matched operation of melting and single-roll aggregates in condition of automatic control of processes of melting, feeding melt metal for casting, casting thin strip, rolling strip to thin sheet and discharging commercial product. Method comprises steps of supplying metal to cooled roll from lower side; providing necessary area of its contact with roll due to raising metal meniscus in casting chamber of single-roll aggregate; raising metal meniscus by rotating melt metal in melting chamber due to action of electromagnetic field and lifting metal relative to walls of melting chamber and in vertical duct of additional vessel. Melt metal is fed into vertical duct of additional vessel from melting chamber through lower horizontal metal conduit. Melt metal is fed from vertical duct of additional vessel to casting chamber of single-roll aggregate through upper horizontal metal conduit in which metal is supplied at controlling its level over metal conduit. Remaining melt metal is removed out of casting chamber after termination of casting due to interrupting metal rotation in melting chamber and it is poured to melting chamber of melting aggregate.

EFFECT: lowered investment expense, reduced maintenance cost, enhanced efficiency of line.

5 cl, 1 dwg

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