Electromagnetic probe of metal liquid level sensor

Abstract

An electromagnetic probe of a metal liquid level sensor comprises an integrated circuit box body and a temperature measurement drawing square tube. The temperature measuring probe is arranged below the lower end flange of the right temperature measuring drawing square tube in the integrated circuit box body; a fixing plate is fixedly connected with the inner wall of the integrated circuit box body above the temperature measurement drawing square tube, the upper end of the linear actuator and the upper end of the potentiometer are both fixed on the fixing plate, and the lower end of a push rod of the linear actuator and the lower end of the potentiometer are both fixed at the upper end of the flange; the temperature measuring probe comprises an electromagnetic coil and a temperature measuring electric joint, the electromagnetic coil is sleeved at the lower end of the high-temperature-resistant insulating lantern ring, and the temperature measuring electric joint is arranged in a middle hole of the high-temperature-resistant insulating lantern ring; the upper end of the high-temperature-resistant insulation sleeve ring is fixedly connected with the lower end of the flange through a stepped cylinder fastener, and the high-temperature-resistant insulation sleeve cup is sleeved with a high-temperature-resistant insulation shield; a round through hole in the U-shaped bottom end of a U-shaped buckle sleeved at the lower end of the flange is sleeved at the outer side of the high-temperature-resistant insulating shield; the metal liquid level sensor can meet the detection precision, has the service life and is very convenient to operate and maintain.

Description

Technical Field

[0001] The utility model relates to the field of metal liquid level detection equipment, in particular to an electromagnetic probe of a metal liquid level sensor. Background Art

[0002] Liquid metal refers to an amorphous metal. Liquid metal can be regarded as a mixture of positive ion fluid and free electron gas. Liquid metal is also an amorphous, flowing liquid metal. High-temperature liquid metal refers to a metal that is solid at room temperature and becomes liquid after being heated to a certain temperature. Such as lead, tin, bismuth and their alloys. Such metals and alloys are widely used in new materials, energy transmission and other fields.

[0003] The high-temperature molten metal melted out of the smelting furnace is output through a certain pipeline and finally poured into the mold, where the high-temperature molten metal is cooled and formed. However, in actual work, the amount of molten metal poured into each mold is required to be fixed.

[0004] Therefore, the pipeline outlet for outputting the molten metal from the smelting furnace urgently needs to be installed with a metal level sensor to facilitate real-time monitoring of whether the liquid level of the molten metal in the mold has reached the set liquid level height when the molten metal is poured into the mold through the pipeline. When the liquid level of the high-temperature molten metal in the mold reaches the required liquid level height, the metal level sensor will close the valve on the pipeline through the PLC control program, and the high-temperature molten metal will stop pouring into the mold through the pipeline. The pipeline mouth will then move to the top of the next empty mold, and the metal level sensor will detect and determine that no high-temperature molten metal has been poured into the mold. The valve on the pipeline will be opened under the control of the metal level sensor to start pouring high-temperature molten metal into the mold, and this process will be repeated. However, the measurement results of traditional metal liquid level sensors have poor linearity. The reason for the poor linearity of the metal liquid level sensor measurement is that the ambient temperature changes and the temperature changes of the electromagnetic coil in the sensor head of the metal liquid level sensor itself after power is turned on will affect the detection accuracy of the sensor head of the metal liquid level sensor. Therefore, there is an urgent need for a metal liquid level sensor, in which a temperature measuring device is provided inside the electromagnetic probe of the sensor itself. When the electromagnetic probe detects the liquid level of the molten metal, the temperature measuring device can simultaneously detect the temperature of the coil inside the electromagnetic probe to correct the accuracy of the electromagnetic probe. Utility Model Content

[0005] The purpose of the utility model is to provide an electromagnetic probe of a metal liquid level sensor to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An electromagnetic probe of a metal liquid level sensor, comprising an integrated circuit box body and a temperature measuring probe; an eddy current tube cooler and a power supply module are arranged outside the integrated circuit box body; a modem main board is arranged above the left side inside the integrated circuit box body, and a motor and a temperature compensation control board are arranged below the left side. The modem main board, the motor and the temperature compensation control board, and the eddy current tube cooler are all connected to the power supply module through power lines. The modem main board and the motor and the temperature compensation control board are connected by data lines; the temperature measuring probe is located below the inside of the temperature measuring draw-out square tube on the right side inside the integrated circuit box body. The temperature measuring draw-out square tube is connected to the side wall of the integrated circuit box body through a slide rail structure. A linear actuator is arranged on the upper right side inside the integrated circuit box body. A square frame fixing bracket is installed on the upper right side inside the integrated circuit box body. The linear actuator is arranged in the up and down direction. The motor of the linear actuator itself is installed on the square frame fixing bracket directly above the temperature measuring draw-out square tube. The motor of the linear actuator is connected to the motor and the temperature compensation control board through a power line. The potentiometer is fixed to the outside of the fixing bracket in the up and down direction through a buckle; a flange is installed at the lower end inside the temperature measuring draw-out square tube. A circular tube body extending inward is arranged in the middle of the circular groove at the lower end of the flange; the temperature measuring probe includes an electromagnetic coil and a temperature measuring thermocouple. The electromagnetic coil is sleeved in the L-shaped groove at the lower end of the high-temperature resistant insulating sleeve ring. The upper end of the high-temperature resistant insulating sleeve ring is connected and fixed to the lower end of the stepped cylinder fastener. The upper end of the stepped cylinder fastener is sleeved inside the inner hole at the lower end of the middle hole of the circular tube body of the flange itself at the lower end. Through holes are arranged at the upper and lower ends of the stepped cylinder fastener; the temperature measuring thermocouple is bonded to the inner side wall of the high-temperature resistant insulating sleeve ring through insulating glue. A cylindrical high-temperature resistant insulating shield is sleeved outside the high-temperature resistant insulating sleeve ring. A folded edge with a fixed length extends outward along the upper edge of the high-temperature resistant insulating shield. The upper end of the high-temperature resistant insulating shield and the folded edge extending outward from the upper end of the high-temperature resistant insulating shield are both embedded in the circular groove provided at the lower end of the flange. The lower end of the flange is sleeved in the U-shaped groove of the U-shaped buckle connector itself. The bottom surface of the U-shaped groove is closely attached below the folded edge extending outward from the upper end of the high-temperature resistant insulating shield. A circular through hole provided on the bottom surface of the U-shaped groove is sleeved outside the high-temperature resistant insulating shield; the two connection ends of the electromagnetic coil itself are connected to a coaxial cable, and the power supply data line of the temperature measuring thermocouple itself passes through the through hole of the stepped cylinder fastener, the middle hole of the high-temperature resistant insulating sleeve ring, the middle hole of the circular tube body of the flange at the lower end, and the through hole at the upper end of the flange, and then passes through the temperature measuring draw-out square tube and is respectively connected to the modem main board, the motor and the temperature compensation control board; the motor and the temperature compensation control board are connected to the integrated circuit module inside the PLC control system box outside the integrated circuit box body through a data line; the end of the push rod extended by the driving box of the linear actuator itself is fixed in the fixing hole at the upper end of the flange through a bolt structure. The rod body of the potentiometer itself is a telescopic draw-out structure. The end of the rod body extended downward by the push rod structure is fixed in the fixing hole above the flange and is fixed by clamping with a bolt.

[0008] An eddy current tube cooler is arranged above the outside of the integrated circuit box body, and a power supply module is arranged behind the outside of the integrated circuit box body. The power supply module is connected to the external workshop power supply through a power line.

[0009] The high-temperature resistant insulating collar is a hollow tube body; the electromagnetic coil itself is wound by copper wire, and the outer side of the copper wire is coated with enameled wire; the electromagnetic coil is sleeved in the L-shaped groove on the lower annular end face of the high-temperature resistant insulating collar, and the opening of the L-shaped groove faces the lower end of the high-temperature resistant insulating collar and the inner side of the tube body of the high-temperature resistant resin itself; the stepped interface at the upper end of the high-temperature resistant insulating collar is connected to the stepped interface at the lower end of the stepped cylindrical fastener and fixed by bonding with insulating glue.

[0010] The stepped cylindrical fastener is a tube body composed of two circular tubes with different outer diameters but the same inner diameter along the up and down directions. Among them, the outer diameter of the upper circular tube of the tube body is smaller than the outer diameter of the lower circular tube of the tube body, and the middle hole of the upper circular tube of the tube body is aligned with the middle hole of the lower circular tube of the tube body; there are threaded holes on the outer side of the upper circular tube of the tube body, and the outer side of the upper circular tube of the tube body is sleeved in the inner side of the lower end of the circular tube body extending downward from the middle of the lower end of the flange; one end of the screw of the bolt itself is inserted into the threaded hole on the side of the tube body of the stepped cylindrical fastener through the through threaded hole on the side of the circular tube body.

[0011] The electromagnetic coil sleeved in the opening of the L-shaped groove on the lower annular end face of the high-temperature resistant insulating collar is divided into an inner electromagnetic coil and an outer electromagnetic coil. The outer electromagnetic coil is sleeved outside the inner electromagnetic coil. Both the outer electromagnetic coil and the inner electromagnetic coil are wound by a single copper wire. The copper wire forming the outer electromagnetic coil extends out from the lower end of the coil and is fixedly connected to the lower end of the copper wire forming the inner electromagnetic coil; two temperature measuring thermocouples are bonded along the up and down directions on the inner side wall of the high-temperature resistant insulating collar with insulating glue, and the upper ends of the temperature measuring thermocouples are connected to one end of the power data line; the end of the copper wire forming the inner electromagnetic coil extending out from the upper end of this coil is the connection end one, and the end of the copper wire forming the outer electromagnetic coil extending out from the upper end of this coil is the connection end two. The connection end one and the connection end two are respectively connected to the wire one and the wire two contained in the coaxial cable. The end of the coaxial cable far from the electromagnetic coil passes through the through hole of the stepped cylindrical fastener, the through hole of the high-temperature resistant insulating collar, the through hole of the circular tube body at the lower end of the flange, and the through hole at the upper end of the flange, and then passes through the temperature measuring draw-out square tube and is connected to the port of the modem main board. Among them, the wire one is connected to the port of the modem main board and is communicated with the bus of the modem main board, and the wire two is connected to the port of the modem main board and is connected to the grounding module provided on the modem main board; the other end of the power data line connected to the two temperature measuring thermocouples passes through the through hole of the stepped cylindrical fastener, the through hole of the high-temperature resistant insulating collar, the through hole of the circular tube body at the lower end of the flange, and the through hole at the upper end of the flange, and then passes through the temperature measuring draw-out square tube and is connected to the motor and temperature compensation control board; the material of the high-temperature resistant insulating cup is high-temperature resistant resin.

[0012] A flange is installed at the lower end inside the temperature-measuring drawable square pipe through a bolt structure. The specific bolt structure is that the flange is a cube, and the side surface of the cube is coplanar with the side surface of the temperature-measuring drawable square pipe. There is a square boss at the upper end of the flange, and the side surface of the square boss is in close contact with the inner side of the lower pipe orifice of the temperature-measuring drawable square pipe. There are bolt holes on both sides of the square boss that are aligned with the positions of the through holes provided on the inner side of the lower pipe orifice of the temperature-measuring drawable square pipe. The end of the screw rod of the bolt itself is inserted into the bolt hole on the side surface of the square boss through the through hole provided on the inner side of the lower pipe orifice of the temperature-measuring drawable square pipe for fixation; there is a through round hole between the two sides of the cube of the flange. The U-shaped buckle connector itself is a plate with a U-shaped cross-section. The size of the U-shaped bottom end of the plate itself is the same as that of the bottom end of the flange. The circular through hole provided at the U-shaped bottom end of the plate itself is larger than the outer diameter of the high-temperature resistant insulating cover. The through round holes provided at the symmetric positions on the two folded edges of the U-shaped plate itself are all aligned with the upper openings on both sides of the through round hole on the cube of the flange. One end of the bolt passes through the circular through hole on one folded edge of the U-shaped buckle itself, the through hole between the two sides of the flange, and extends out through the circular through hole on the other folded edge of the U-shaped buckle and then is sleeved with a nut for fixation; the high-temperature resistant insulating cover is made of high-temperature resistant ceramics.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] In the present utility model, based on the change in the impedance value within the electromagnetic coil caused by the eddy current induction between the electromagnetic coil inside the electromagnetic probe of the metal liquid level sensor itself and the molten metal being poured in the mold, the height of the molten metal level in the mold is measured in real time. When the height of the metal liquid level in the mold reaches the set value, the metal liquid level sensor will close the valve on the pipeline through the PLC control program, and the high-temperature molten metal will stop pouring into the mold through the pipeline; the metal liquid level sensor and the pipeline controlled by the valve are moved above the next empty mold by the staff and the valve is opened to start pouring the molten metal, and so on; at the same time, a temperature measuring device is provided inside the electromagnetic probe of the sensor itself. When the electromagnetic probe detects the molten metal level, the temperature measuring device can simultaneously detect the temperature of the coil inside the electromagnetic probe to correct the accuracy of the electromagnetic probe.

[0015] Secondly, in the present utility model, the electromagnetic coil and the temperature measuring thermocouple of the electromagnetic probe of the metal liquid level sensor itself are both located on the high-temperature resistant insulating sleeve ring. The high-temperature resistant insulating sleeve ring is made of high-temperature resistant resin. The high-temperature resistant insulating cover is sleeved outside the high-temperature resistant insulating sleeve ring. The high-temperature resistant insulating cover is made of ceramics. The insulation performance of the high-temperature resistant insulating cover and the high-temperature resistant insulating sleeve ring itself ensures the accuracy of the electromagnetic coil measurement and also protects the electromagnetic coil and the temperature measuring thermocouple from being affected by the external environment during operation, thereby prolonging the service life of the electromagnetic probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] As shown in the figure: 1 Modulation and demodulation main board; 2 Motor and temperature compensation control board; 3 Integrated circuit box; 4 Power data line; 5 Coaxial cable; 6 Linear actuator; 7 Potentiometer; 8 Temperature-measuring pull-out square tube; 9 High-temperature resistant insulating collar; 10 High-temperature resistant insulating shield; 11 Electromagnetic coil; 12 Temperature-measuring thermocouple; 13 U-shaped buckle; 14 Flange; 15 Fixed bracket. Specific implementation manner

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention; in the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "upper and lower", "inner", "outer", "left and right", "front and back", "bottom end", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] Please refer to the legend. An electromagnetic probe of a metal liquid level sensor includes an integrated circuit box body 3 and a temperature measuring probe. An eddy current tube cooler and a power module are provided outside the integrated circuit box body 3. Above the left side inside the integrated circuit box body 3, there is a modem main board, and below the left side, there is a motor and temperature compensation control board 2. The modem main board, the motor and temperature compensation control board 2, and the eddy current tube cooler are all connected to the power module through power lines. The modem main board and the motor and temperature compensation control board 2 are connected by data lines. The temperature measuring probe is located below the inside of the temperature measuring draw-out square tube 8 on the right side inside the integrated circuit box body 3. The temperature measuring draw-out square tube 8 is connected to the side wall of the integrated circuit box body 3 through a slide rail structure. On the upper right side of the inside of the integrated circuit box body 3, a square frame fixing bracket 15 is installed. The linear actuator 6 is arranged in the up and down direction. The motor of the linear actuator 6 itself is installed on the square frame fixing bracket 15 directly above the temperature measuring draw-out square tube 8. The motor of the linear actuator 6 is connected to the motor and temperature compensation control board 2 through a power line. The potentiometer 7 is fixed to the outside of the fixing bracket 15 in the up and down direction through a buckle. At the lower end inside the temperature measuring draw-out square tube 8, a flange 14 is installed. In the middle of the lower end of the flange 14, there is a circular tube body extending downward. The temperature measuring probe includes an electromagnetic coil 11 and a temperature measuring thermocouple 12. The electromagnetic coil 11 is sleeved in the L-shaped groove at the lower end of the high-temperature resistant insulating sleeve ring 9. The upper end of the high-temperature resistant insulating sleeve ring 9 is connected and fixed to the lower end of the stepped cylinder fastener. The upper end of the stepped cylinder fastener is sleeved inside the lower end of the middle hole of the circular tube body of the middle part of the lower end of the flange 14 itself. Through holes are provided at the upper and lower ends of the stepped cylinder fastener. The side wall inside the high-temperature resistant insulating sleeve ring 9 is bonded with the temperature measuring thermocouple 12 through insulating glue. A cylindrical high-temperature resistant insulating shield 10 is sleeved outside the high-temperature resistant insulating sleeve ring 9. A folded edge with a fixed length extends outward along the upper edge of the high-temperature resistant insulating shield 10. The upper end of the high-temperature resistant insulating shield 10 and the folded edge extending outward from the upper end of the high-temperature resistant insulating shield 10 are both embedded in the circular groove provided at the lower end of the flange 14. The lower end of the flange 14 is sleeved in the U-shaped groove of the U-shaped buckle 13 connecting piece itself. The bottom surface of the U-shaped groove closely adheres to the lower side of the folded edge extending outward from the upper end of the high-temperature resistant insulating shield 10. The circular through hole provided on the bottom surface of the U-shaped groove is sleeved outside the high-temperature resistant insulating shield 10. The coaxial cable 5 with the positive and negative poles of the electromagnetic coil 11 connected and the power data line 4 of the temperature measuring thermocouple 12 itself both pass through the through holes of the stepped cylinder fastener, the middle hole of the high-temperature resistant insulating sleeve ring 9, the middle hole of the circular tube body of the lower end of the flange 14, and the through hole at the upper end of the flange 14, and then pass through the temperature measuring draw-out square tube 8 and are respectively connected to the modem main board and the motor and temperature compensation control board 2. The motor and temperature compensation control board 2 is connected to the integrated circuit module inside the PLC control system box outside the integrated circuit box body 3 through a data line. The end of the push rod extended from the drive box of the linear actuator 6 itself is fixed in the fixing hole at the upper end of the flange 14 through a bolt structure. The rod body of the potentiometer 7 itself is a telescopic draw-out structure. The end of the rod body extending downward from the draw-out structure is fixed in the fixing hole above the flange 14 and is fixed by tightening with a bolt. The data line connected to the upper end of the potentiometer 7 is connected to the motor and temperature compensation control board.

[0020] An eddy current tube cooler is provided above the outer side of the integrated circuit box body 3, and a power supply module is provided behind the outer side of the integrated circuit box body 3. The power supply module is connected to the external workshop power supply through a power cord.

[0021] The high-temperature resistant insulating collar 9 is a hollow tube body; the electromagnetic coil 11 itself is wound by copper wires, and the outer side of the copper wires is coated with insulating enameled wires; the electromagnetic coil 11 is sleeved in the L-shaped groove on the annular end surface at the lower end of the high-temperature resistant insulating collar 9, and the opening of the L-shaped groove faces the lower end of the high-temperature resistant insulating collar 9 and the inner side of the tube body of the high-temperature resistant resin itself; the stepped interface at the upper end of the high-temperature resistant insulating collar 9 is connected to the stepped interface at the lower end of the stepped cylindrical fastener and is fixedly bonded by insulating glue.

[0022] The stepped cylindrical fastener is a tube body composed of two round tubes with different outer diameters but the same inner diameter in the up and down direction. Among them, the outer diameter of the upper round tube of the tube body is smaller than the outer diameter of the lower round tube of the tube body, and the middle hole of the upper round tube of the tube body is aligned with the middle hole of the lower round tube of the tube body; threaded holes are provided on the outer side of the upper round tube of the tube body, and the outer side of the upper round tube of the tube body is sleeved in the inner side of the lower end of the circular tube body extending downward in the middle of the lower end of the flange 14; one end of the screw rod of the bolt itself is inserted into the threaded hole on the side of the tube body of the stepped cylindrical fastener through the through threaded hole on the side of the circular tube body.

[0023] The electromagnetic coils 11 placed in the L-shaped groove opening at the lower annular end face of the high-temperature resistant insulating collar 9 are divided into an inner electromagnetic coil 11 and an outer electromagnetic coil 11. The outer electromagnetic coil 11 is sleeved outside the inner electromagnetic coil 11. Both the outer electromagnetic coil 11 and the inner electromagnetic coil 11 are wound by a single copper wire. The copper wire forming the outer electromagnetic coil 11 extends out from the lower end of the coil and is fixedly connected to the lower end of the copper wire forming the inner electromagnetic coil 11. Two temperature measuring thermocouples are adhesively bonded along the vertical direction on the inner side wall of the high-temperature resistant insulating collar 9 with insulating glue. The upper ends of the temperature measuring thermocouples are connected to one end of the power data cable 4. The end of the copper wire forming the inner electromagnetic coil 11 extending out from the upper end of this coil is the first connection end, and the end of the copper wire forming the outer electromagnetic coil 11 extending out from the upper end of this coil is the second connection end. The first connection end and the second connection end are respectively connected to the first wire and the second wire contained in the coaxial cable 5. One end of the coaxial cable 5 away from the electromagnetic coil 11 passes through the through hole of the stepped cylinder fastener, the through hole of the high-temperature resistant insulating collar 9, the through hole of the lower circular tube body of the flange 14, and the through hole at the upper end of the flange 14, and then passes through the temperature measuring pull-out square tube 8 and is connected to the port of the modem main board. Among them, after the first wire is connected to the port of the modem main board, it is communicated with the bus of the modem main board, and the second wire is connected to the port of the modem main board and is connected to the grounding module provided on the modem main board. The other end of the power data cable to which the two temperature measuring thermocouples are connected passes through the through hole of the stepped cylinder fastener, the through hole of the high-temperature resistant insulating collar 9, the through hole of the lower circular tube body of the flange 14, and the through hole at the upper end of the flange 14, and then passes through the temperature measuring pull-out square tube 8 and is connected to the motor and temperature compensation control board. The high-temperature resistant insulating collar 9 is made of high-temperature resistant resin.

[0024] A flange 14 is installed at the lower end inside the temperature measuring pull-out square tube 8 through a bolt structure. The specific bolt structure is that the flange 14 is a cube, and the side surface of the cube is coplanar with the side surface of the temperature measuring pull-out square tube 8. There is a square boss at the upper end of the flange 14, and the side surface of the square boss is closely attached to the inner side of the lower end pipe orifice of the temperature measuring pull-out square tube 8. There are bolt holes on both sides of the square boss aligned with the positions of the through holes provided on the inner side of the lower end pipe orifice of the temperature measuring pull-out square tube 8. The end of the screw rod of the bolt itself is inserted into the bolt hole on the side surface of the square boss through the through hole provided on the inner side of the lower end pipe orifice of the temperature measuring pull-out square tube 8 for fixation. There is a through circular hole between the two sides of the cube of the flange 14. The connecting part of the U-shaped buckle 13 is itself a plate with a U-shaped cross-section. The size of the U-shaped bottom end of the plate itself is the same as that of the bottom end of the flange 14. The circular through hole provided at the U-shaped bottom end of the plate itself is larger than the outer diameter of the high-temperature resistant insulating cover 10. The through circular holes provided at the symmetric positions on the two folded edges of the U-shaped part of the plate itself are all aligned with the openings on the two sides of the through circular hole on the cube of the flange 14. One end of the bolt passes through the circular through hole on one folded edge of the U-shaped buckle 13 itself and the through hole between the two sides of the flange 14, and after extending out from the circular through hole on the other folded edge of the U-shaped buckle 13 itself, a nut is sleeved for fixation. The high-temperature resistant insulating cover 10 is made of high-temperature resistant ceramic.

[0025] The working principle of the utility model is as follows: In the utility model, based on the change in the internal impedance value of the electromagnetic coil 11 inside the electromagnetic probe of the metal liquid level sensor caused by the electro-eddy current induction between the electromagnetic coil 11 itself inside the electromagnetic probe of the metal liquid level sensor and the molten metal being poured in the mold, the modulation and demodulation main board 1 is connected to the positive and negative poles of the electromagnetic coil 11 of the electromagnetic probe of the metal liquid level sensor through its own interface. When the liquid level of the molten metal is closer to the lower end of the electromagnetic probe of the metal liquid level sensor, the resistance value of the electromagnetic coil 11 itself in the electromagnetic probe increases and the reactance value is relatively constant. The modulation and demodulation main board 1 of the metal liquid level sensor measures the change values of the resistance value and the reactance value in the electromagnetic coil 11 in real time, and converts the change values into data signals, so as to achieve real-time measurement of the height of the molten metal liquid level in the mold. The modulation and demodulation main board 1 of the metal liquid level sensor transmits the data signals to the motor and temperature compensation control board 2 of the metal liquid level sensor in real time. The motor and temperature compensation control board 2 of the metal liquid level sensor further fuses and corrects the data signals transmitted from the temperature measuring thermocouple 12 and the potentiometer 7, and then transmits them to the integrated circuit module inside the PLC control system box; when the height of the metal liquid level in the mold reaches the set value, the integrated circuit module inside the PLC control system box will close the valve on the pipeline, and the high-temperature molten metal will stop pouring into the mold through the pipeline; the metal liquid level sensor and the pipeline controlled by the valve are moved above the next empty mold by the operator, and the valve is opened to start pouring the molten metal, and so on. At the same time, when the metal liquid level in the mold reaches near the electromagnetic probe of the metal liquid level sensor, the motor and temperature compensation control board will lift the height of the electromagnetic probe of the metal liquid level through the linear actuator push rod.

[0026] The function of the internal temperature measuring thermocouple 12 in the electromagnetic probe of the metal liquid level sensor itself is to measure the temperature of the electromagnetic coil 11 on the high-temperature resistant insulating collar 9; as the electromagnetic probe approaches the metal melt liquid level, the ambient temperature rises, causing the electromagnetic coil 11 to heat up, and the electromagnetic coil 11 will inevitably heat up after being energized. Since the electromagnetic coil 11 heats up, the resistance value and reactance value of the electromagnetic coil 11 itself will change differently from the normal temperature state, resulting in an error in the data signal transmitted from the modulation and demodulation main board 1 to the motor and temperature compensation control board 2, and further causing an error in the data signal transmitted from the modulation and demodulation board of the metal liquid level sensor to the integrated circuit module in the PLC control system box through the metal liquid level sensor motor and temperature compensation control board 2. Therefore, the error must be corrected; after the electromagnetic coil 11 heats up, the heat is conducted to the high-temperature resistant insulating collar 9, causing the high-temperature resistant insulating collar 9 and the electromagnetic coil 11 to heat up together. Then, the temperature of the high-temperature resistant insulating collar 9 is measured by the temperature measuring thermocouple 12, and the measured value is conducted to the motor and temperature compensation control board in the form of a data signal through the data power line. The motor and temperature compensation control board 2 combines the signals from the temperature measuring thermocouple 12 and the modulation and demodulation main board 1 into a new data signal. At the same time, the potentiometer 7 further measures the resistance and current changes of the electromagnetic coil 11 and transmits the measured data to the motor and temperature compensation main control board. After the new data signal combined by the motor and temperature compensation control board 2 from the signals of the temperature measuring thermocouple 12 and the modulation and demodulation main board 1 is further combined and corrected with the data signal transmitted back by the potentiometer 7, it is transmitted to the integrated circuit module in the PLC control system box as the final data signal.

[0027] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An electromagnetic probe of a metal liquid level sensor, comprising an integrated circuit box and a temperature measuring probe; an eddy current tube cooler and a power module are arranged on the outside of the integrated circuit box, a modem mainboard is arranged on the upper left side of the integrated circuit box, and a motor and a temperature compensation control board are arranged on the lower left side, the modem mainboard, the motor and the temperature compensation control board, and the eddy current tube cooler are all connected to the power module through a power line, and the modem mainboard, the motor and the temperature compensation control board are connected by a data line; the temperature measuring probe is located below the inside of the temperature measuring pull-out square tube on the right side of the integrated circuit box, the temperature measuring pull-out square tube is connected to the side wall of the integrated circuit box through a slide rail structure, a linear actuator is arranged on the right side of the upper end of the integrated circuit box, a square frame fixing frame is installed on the right side of the upper end of the integrated circuit box, the linear actuator is arranged in the up-down direction, the linear actuator motor itself is installed on the square frame fixing frame located just above the temperature measuring pull-out square tube, the linear actuator motor is connected to the motor and the temperature compensation control board through a power line, and the potentiometer is fixed to the outside of the fixing frame by a buckle in the up-down direction; it is characterized in that: A flange is installed at the lower end of the temperature measuring pull-out square tube through a bolt structure, and a circular tube body extending outward is provided in the middle of the circular groove at the lower end of the flange; the temperature measuring probe includes an electromagnetic coil and a temperature measuring electrode, the electromagnetic coil is sleeved in the L-shaped groove at the lower end of the high-temperature resistant insulating ring, the upper end of the high-temperature resistant insulating ring is connected and fixed to the lower end of the stepped cylindrical fastener, the upper end of the stepped cylindrical fastener is sleeved on the inner side of the lower end of the central hole of the circular tube body itself in the middle of the lower end of the flange, and the stepped cylindrical fastener is provided with a through central hole at both ends; the inner side wall of the high-temperature resistant insulating ring is bonded with the temperature measuring electrode by insulating glue, and a cylindrical high-temperature resistant insulating shield is sleeved on the outer side of the high-temperature resistant insulating shield, and a folded edge of a fixed length extends outward along the upper end edge of the high-temperature resistant insulating shield, the upper end of the high-temperature resistant insulating shield and the folded edge extending outward from the upper end of the high-temperature resistant insulating shield are both embedded in the circular groove provided at the lower end of the flange, and the lower end of the flange is sleeved in the U-shaped groove of the U-shaped snap connector itself, and the bottom surface of the U-shaped groove is tightly attached to the folded edge extending outward from the upper end of the high-temperature resistant insulating shield. At the bottom, the circular through hole provided on the bottom surface of the U-shaped groove is sleeved on the outside of the high-temperature resistant insulating shield; the coaxial cable connected to the two connecting ends of the electromagnetic coil itself and the power data line of the temperature measuring electrode itself are all passed through the middle hole, the middle hole of the high-temperature resistant insulating collar, the middle hole of the circular tube body at the lower end of the flange, and the through hole at the upper end of the flange through the stepped cylindrical fastener, and then pass through the temperature measuring pull-out square tube and are respectively connected to the modem mainboard, the motor and the temperature compensation control board; the motor and the temperature compensation control board are connected to the integrated circuit module in the PLC control system box located outside the integrated circuit box through the data line; the push rod end extending from the driving box of the linear actuator itself is fixed in the fixing hole at the upper end of the flange through the bolt structure, and the rod body of the potentiometer itself is a retractable pull-out structure, and the rod body end extending downward from the push rod structure is fixed in the fixing hole above the flange and is clamped and fixed by bolts; the data line connected to the upper end of the potentiometer is connected to the motor and the temperature compensation control board; the motor of the linear actuator itself is connected to the motor and the temperature compensation control board through the power line.

2. The electromagnetic probe of the metal liquid level sensor according to claim 1, characterized in that: A vortex tube cooler is arranged above the outer side of the integrated circuit box, and a power module is arranged at the rear of the outer side of the integrated circuit box. The power module is connected to the external workshop power supply through a power line.

3. The electromagnetic probe of the metal liquid level sensor according to claim 1, characterized in that: The high temperature resistant insulating sleeve is a hollow tube; the electromagnetic coil itself is wound with copper wire, and the outside of the copper wire is covered with insulating enameled wire; the electromagnetic coil is sleeved in the L-shaped groove on the annular end face of the lower end of the high temperature resistant insulating sleeve, and the opening of the L-shaped groove faces the lower end of the high temperature resistant insulating sleeve and the inner side of the high temperature resistant resin tube itself; the stepped interface at the upper end of the high temperature resistant insulating sleeve is connected with the stepped interface at the lower end of the stepped cylindrical fastener and fixed by insulating glue.

4. The electromagnetic probe of the metal liquid level sensor according to claim 3 is characterized in that: The stepped cylindrical fastener is composed of a tube body formed by two circular tubes with different outer diameters but the same inner diameter in the up and down directions, wherein the outer diameter of the circular tube located above the tube body itself is smaller than the outer diameter of the circular tube located below the tube body itself, and the center hole of the circular tube located above the tube body itself is aligned with the center hole of the circular tube located below the tube body itself; a threaded hole is provided on the outer side of the circular tube above the tube body itself, and the outer side of the circular tube above the tube body itself is sleeved on the inner side of the lower end of the center hole of the circular tube body extending downward from the middle of the lower end of the flange; one end of the screw rod of the bolt itself is inserted into the threaded hole on the side of the stepped cylindrical fastener itself through the through threaded hole on the side of the circular tube body.

5. The electromagnetic probe of the metal liquid level sensor according to claim 1, characterized in that: The electromagnetic coil sleeved in the L-shaped groove opening of the annular end face at the lower end of the high-temperature resistant insulating sleeve is divided into an inner electromagnetic coil and an outer electromagnetic coil. The outer electromagnetic coil is sleeved on the outside of the inner electromagnetic coil. Both the outer electromagnetic coil and the inner electromagnetic coil are wound by a copper wire. The copper wire constituting the outer electromagnetic coil extends from the lower end of the coil and is fixedly connected to the lower end of the copper wire constituting the inner electromagnetic coil; two temperature measuring electrodes are bonded to the upper side wall of the inner side of the high-temperature resistant insulating sleeve in the up and down directions by insulating glue, and the upper end of the temperature measuring electrode is connected to one end of the power data line; the end of the copper wire constituting the inner electromagnetic coil extending from the upper end of the coil is the connecting end one, and the end of the copper wire constituting the outer electromagnetic coil extending from the upper end of the coil is the connecting end two, and the connecting end one and the connecting end two are respectively connected to the wire contained in the coaxial cable One, two wires are connected, the end of the coaxial cable itself away from the electromagnetic coil passes through the middle hole, the middle hole of the high-temperature resistant insulating ring, the middle hole of the circular tube body at the lower end of the flange, and the through hole at the upper end of the flange, and then passes through the temperature measuring pull-out square tube to be connected to the modem motherboard port, wherein, after the wire one is connected to the modem motherboard port, it is communicated with the modem motherboard bus, and the wire two is connected to the modem motherboard port and is connected to the grounding module provided on the modem motherboard; the other ends of the power data lines connected to the two temperature measuring electrodes themselves pass through the middle hole, the middle hole of the high-temperature resistant insulating ring, the middle hole of the circular tube body at the lower end of the flange, and the through hole at the upper end of the flange, and then pass through the temperature measuring pull-out square tube to be connected to the motor and the temperature compensation control board; the material of the high-temperature resistant insulating sleeve cup is high-temperature resistant resin.

6. The electromagnetic probe of the metal liquid level sensor according to claim 1, characterized in that: A flange is installed at the lower end of the temperature measuring pull-out square tube through a bolt structure. The specific bolt structure is that the flange is a square body, the side of the square body is coplanar with the side of the temperature measuring pull-out square tube, and a square boss is provided at the upper end of the flange. The side of the square boss is tightly attached to the inner side of the lower end of the temperature measuring pull-out square tube. Bolt holes are provided on both sides of the square boss and are aligned with the through holes provided on the inner side of the lower end of the temperature measuring pull-out square tube. The screw end of the bolt itself is inserted into the bolt hole on the side of the square boss through the through hole provided on the inner side of the lower end of the temperature measuring pull-out square tube and fixed; There is a through circular hole between the two sides of the flange cube. The U-shaped snap connector itself is a plate with a U-shaped cross-section. The U-shaped bottom end of the plate itself and the flange bottom end are the same size. The circular through hole at the U-shaped bottom end of the plate itself is larger than the outer diameter of the high-temperature resistant insulating shield. The through circular holes symmetrically arranged on the two folded edges of the U-shaped plate itself are aligned with the openings of the through circular holes on both sides of the flange cube. One end of the bolt passes through the circular through hole on the folded edge on one side of the U-shaped snap itself, the through hole between the two sides of the flange, and extends out from the circular through hole on the folded edge on the other side of the U-shaped snap itself and then is fixed with a nut. The material of the high-temperature resistant insulating shield is high-temperature resistant ceramic.

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