Weighing device for electric furnace and electric furnace

Abstract

The utility model provides a weighing device for an electric furnace and the electric furnace. The weighing device comprises a sensor; the support is provided with a through hole extending in the vertical direction. The bearing rod penetrates through the through hole and comprises an upper end part and a lower end part which extend out of the through hole and are opposite to each other, the sensor is arranged between the upper end part and the support, a furnace shell of the electric furnace is suitable for being fixedly connected with the lower end part, and the gravity of the furnace shell is applied to the sensor through the bearing rod; the outer diameter of the bearing rod is smaller than the aperture of the through hole so that the bearing rod can swing in the through hole. According to the technical scheme, the problem that in the prior art, due to the fact that a furnace shell of an electric furnace expands after being heated, weighing is inaccurate is solved.

Description

Technical Field

[0001] The utility model relates to the field of electric furnaces, and particularly provides a weighing device and an electric furnace for an electric furnace. Background Art

[0002] An electric furnace is a heating furnace that converts electric energy in the furnace into heat to heat workpieces, and belongs to the primary steelmaking furnace. The furnace body of the electric furnace consists of a furnace shell and a furnace lining. The furnace shell is welded by steel plates, the furnace wall is built with magnesite bricks or chrome-magnesite bricks, the furnace bottom is in a basin shape, and there is a magnesite sintered (beaten) layer on the clay bricks and magnesite bricks. The electric furnace uses graphite electrodes to discharge and form an arc with the furnace charge. When gas discharges, the arc energy is very concentrated, and the temperature in the arc zone can reach above 3000°C.

[0003] The weighing system of the electric furnace is crucial. If the weighing system is inaccurate, situations such as part of the molten steel overflowing into the slag pit due to excessive addition of scrap steel, or the furnace slag entering the casting ladle due to too little molten steel remaining in the furnace may occur. How to improve the weighing accuracy of the electric furnace has always been a technical topic discussed by electric furnace engineers. After the existing electric furnace enters the working state, the high temperature of its furnace shell is conducted to the weighing device, which often causes deformation of some structures in the weighing device, resulting in inaccurate weighing results.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model

[0005] In order to solve the problem that the weighing of the existing electric furnace is inaccurate due to the thermal expansion of the furnace shell, the utility model provides a weighing device for an electric furnace. The weighing device includes: a sensor; a bracket provided with a through hole extending in the vertical direction; and a load-bearing rod passing through the through hole and including opposite upper and lower ends extending beyond the through hole. The sensor is arranged between the upper end and the bracket. The furnace shell of the electric furnace is adapted to form a fixed connection with the lower end and apply the gravity of the furnace shell to the sensor through the load-bearing rod. The outer diameter of the load-bearing rod is smaller than the aperture of the through hole, so that the load-bearing rod can swing in the through hole.

[0006] The utility model senses the weight transmitted by the furnace shell through a sensor to weigh the furnace shell and the molten steel contained therein. The support includes a through hole extending vertically, so that the load-bearing rod can be accommodated therein, providing a stable fixing point for the load-bearing rod. The load-bearing rod passes through the through hole and includes opposite upper and lower ends extending beyond the through hole, so that the upper end can be connected to the sensor and the lower end can be connected to the furnace shell to achieve suspended weighing. The sensor is arranged between the upper end and the support. Since the support is fixed, the load-bearing rod will be affected by the gravity of the furnace shell. Therefore, the sensor arranged between the upper end and the support will be squeezed and deformed, and the tension caused by the weight of the furnace shell on the load-bearing rod can be measured through this deformation. The outer diameter of the load-bearing rod is smaller than the aperture of the through hole, enabling the load-bearing rod to swing in the through hole. Through the above configuration, even after the electric furnace works and the furnace shell deforms due to heat, the swing of the load-bearing rod can absorb this deformation, enabling the sensor to work normally and obtain accurate weighing results.

[0007] In the preferred technical solution of the above weighing device for an electric furnace, the sensor is configured as an annular member and sleeved outside the load-bearing rod. The load-bearing rod includes a pressure ring extending along its circumference. The pressure ring is located above the sensor and can apply pressure to the sensor. Through the above configuration, the annular sensor and the annular pressure ring make the force on each point of the sensor more balanced, thus ensuring accurate weighing results.

[0008] In the preferred technical solution of the above weighing device for an electric furnace, the through hole has an opening edge at its upper opening; the load-bearing rod further includes an adjusting ring extending along its circumference. The adjusting ring includes a lower surface configured as a spherical surface. The lower surface is in contact with at least part of the opening edge and can slide relative to the opening edge; the sensor is arranged between the pressure ring and the adjusting ring. Through the above configuration, an adjusting ring is arranged between the sensor and the support, so that when the load-bearing rod swings under the action of the furnace shell, the lower surface of the adjusting ring can swing at a certain angle following the load-bearing rod, ensuring that the tension on the load-bearing rod can still be measured through the pressure of the pressure ring on the sensor and guaranteeing the measurement accuracy.

[0009] In the preferred technical solution of the above weighing device for an electric furnace, a groove is provided on the opening edge. The bottom surface of the groove is configured as a spherical surface matching the lower surface, and the lower surface abuts against the bottom surface. Through the above setting, the lower surface abuts against the bottom surface, making the contact between the adjusting ring and the support more stable to ensure the stability of the weighing result.

[0010] In the preferred technical solution of the above weighing device for an electric furnace, the load-bearing rod is configured as a cylinder. Through the above setting, the cylindrical load-bearing rod has a larger swing stroke in the through hole, capable of meeting a larger deformation of the furnace shell.

[0011] To solve the problem in the prior art that the weighing of an electric furnace is inaccurate due to the thermal expansion of the furnace shell, the present utility model also provides an electric furnace. The electric furnace includes at least one weighing device for the electric furnace described in the above preferred technical solution. Through the arrangement of the weighing device of the present utility model, after the electric furnace enters the working state, even if the furnace shell deforms, the weighing device can accurately measure the total weight of the furnace shell and the molten steel contained in the furnace shell.

[0012] In the preferred technical solution of the above electric furnace, the electric furnace includes a furnace shell and a plurality of the weighing devices. The weighing devices are arranged on the outer side of the furnace shell along the circumferential direction, and a fixed connection is formed between the furnace shell and each lower end portion. Through the above arrangement, on the one hand, the circumferential arrangement of the weighing devices can absorb the deformation of the furnace shell from multiple directions, and also makes the pressure borne by each weighing device more balanced, ensuring the accuracy of the weighing result.

[0013] In the preferred technical solution of the above electric furnace, before the electric furnace is started, each load-bearing rod extends obliquely towards the electric furnace. Through the above arrangement, the furnace shell usually expands towards the periphery due to heat. During installation, the load-bearing rods are configured to extend obliquely towards the furnace shell before the electric furnace is started, so that after the furnace shell expands, each load-bearing rod can extend substantially in the vertical direction, making the weighing result accurately reflect the weight of the furnace shell. Description of the Drawings

[0014] The following describes the preferred embodiments of the present utility model with reference to the drawings. In the drawings:

[0015] Figure 1 is a schematic structural diagram of an embodiment of the electric furnace of the present utility model;

[0016] Figure 2 is a cross-sectional view taken along line B-B of an embodiment of the weighing device for an electric furnace of the present utility model.

[0017] List of Reference Numerals:

[0018] 100, weighing device; 10, sensor; 20, bracket; 21, column; 22, cantilever; 23, through hole; 231, upper opening; 2311, opening edge; 2312, groove; 232, lower opening; 30, load-bearing rod; 31, upper end portion; 32, lower end portion; 321, load-bearing platform; 33, pressure ring; 34, adjusting ring; 341, lower surface; 400, electric furnace; 50, furnace shell; 51, lifting lug. Detailed Embodiments

[0019] The following describes the preferred embodiments of the present utility model with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0020] It should be noted that in the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0021] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] To solve the problem in the prior art that the weighing of an electric furnace is inaccurate due to the thermal expansion of the furnace shell, the present utility model provides a weighing device 100 for an electric furnace. The weighing device 100 includes: a sensor 10; a bracket 20 provided with a through hole 23 extending in the vertical direction; and a load-bearing rod 30 passing through the through hole 23 and including opposite upper end portions 31 and lower end portions 32 extending beyond the through hole 23. The sensor 10 is arranged between the upper end portion 31 and the bracket 20. The furnace shell 50 of the electric furnace 400 is adapted to form a fixed connection with the lower end portion 32 and apply the gravity of the furnace shell 50 to the sensor 10 through the load-bearing rod 30. The outer diameter of the load-bearing rod 30 is smaller than the aperture of the through hole 23 so that the load-bearing rod 30 can swing in the through hole 23.

[0023] Figure 1 is a schematic structural view of an embodiment of the electric furnace of the present utility model; Figure 2 is a cross-sectional view of an embodiment of the weighing device for an electric furnace of the present utility model at B-B. As Figure 2 shown, the weighing device 100 of the present utility model includes a sensor 10, a bracket 20, and a load-bearing rod 30 extending through the bracket 20. The furnace shell 50 of the electric furnace 400 is suspended on the bracket 20 through the load-bearing rod 30.

[0024] Continue to refer to Figure 2 , in one or more embodiments, the bracket 20 is adapted to be arranged on the base of the electric furnace 400 to provide a stable support point for the furnace shell 50. The bracket 20 includes a column 21 adapted to be connected to the base and a cantilever 22 fixed on the column 21. The connection manner between the cantilever 22 and the column 21 includes but is not limited to screwing, riveting, integral molding, etc. A through hole 23 is provided on the cantilever 22, and the through hole 23 extends in the vertical direction to facilitate accommodating a load-bearing column extending in the vertical direction in the through hole 23 to measure the weight of the furnace shell 50. In one or more embodiments, the through hole 23 has an upper opening 231 and a lower opening 232. Based on Figure 2In the orientation shown, from the upper opening 231 to the lower opening 232, the cross-sectional area of each part of the through hole 23 is equal, which is convenient for processing. Alternatively, the through hole 23 can also be configured such that the cross-section gradually expands from the upper opening 231 to the lower opening 232, so that the space where the load-bearing rod 30 can swing is larger.

[0025] Continue to refer to Figure 2 , in one or more embodiments, the load-bearing rod 30 extends through the through hole 23 and includes an upper end portion 31 that extends beyond the upper opening 231 and a lower end portion 32 that extends beyond the lower opening 232. The lower end portion 32 is adapted to form a fixed connection with the furnace shell 50 of the electric furnace 400, so that the furnace shell 50 can be suspended on the bracket 20 through the load-bearing rod 30 to measure the weight. The upper end portion 31 is provided with a pressure ring 33 that extends circumferentially along the load-bearing rod 30. Correspondingly, the sensor 10 is also configured to surround the load-bearing rod 30 circumferentially. The sensor 10 is disposed between the pressure ring 33 and the bracket 20. When the furnace shell 50 exerts a tensile force on the load-bearing rod 30, the pressure ring 33 has a tendency to squeeze the sensor 10 downward, while the bracket 20 remains stationary, so that the sensor 10 is compressed to measure the weight of the furnace shell 50 and the molten steel contained in the furnace shell 50. In an alternative embodiment, the upper end portion 31 can also be received in the through hole 23, and the sensor 10 disposed between the upper end portion 31 and the bracket 20 is squeezed by other suitable means. The outer diameter of the load-bearing rod 30 is smaller than the aperture of the through hole 23 and is configured as a cylindrical member in one or more embodiments, so as to swing in the through hole 23. Alternatively, the load-bearing rod 30 can also be configured in other suitable shapes.

[0026] Continue to refer to Figure 2 , in one or more embodiments, the load-bearing rod 30 further includes an adjusting ring 34. The adjusting ring 34 extends circumferentially along the load-bearing rod 30, and the adjusting ring 34 has a lower surface 341 facing the through hole 23. The upper opening 231 includes a generally circular opening edge 2311, and the lower surface 341 is configured as a spherical surface and abuts against the opening edge 2311, so that the adjusting ring 34 with a spherical lower surface 341 can slide relative to the opening edge 2311, and further the load-bearing rod 30 can swing within a certain angle in the through hole 23 with the adjusting ring 34 as the rotation center. The sensor 10 is clamped between the pressure ring 33 and the adjusting ring 34. The adjusting ring 34 does not generate displacement except for rotating around the center of the spherical bottom surface, so that the sensor 10 can normally weigh the weight. Alternatively, the setting of the adjusting ring 34 can also be cancelled, and the load-bearing rod 30 can swing in the through hole 23 by other suitable means. In one or more embodiments, a groove 2312 is provided on the opening edge 2311, and the bottom surface of the groove 2312 is configured as a spherical surface that matches the lower surface 341, and the lower surface 341 abuts against the bottom surface, so that the contact between the adjusting ring 34 and the bracket 20 is more stable.

[0027] The present utility model further provides an electric furnace 400, which includes at least one of the above-mentioned weighing devices 100. As Figure 1 shown, in one or more embodiments, the electric furnace 400 includes a furnace shell 50 and 4 weighing devices 100, and the weighing devices 100 are arranged at intervals along the circumferential direction of the furnace shell 50. The furnace shell 50 is fixedly connected to the load-bearing rod 30 in each weighing device 100. Specifically, it is fixedly connected to the lower end portion 32. As Figure 2 shown, in one or more embodiments, the furnace shell 50 includes a lifting lug 51, the load-bearing rod 30 extends through the lifting lug 51, and a load-bearing platform 321 is provided at the lower end portion 32, and the lifting lug 51 presses on the load-bearing platform 321 to apply a downward force to the load-bearing rod 30. Alternatively, the furnace shell 50 can also be fixedly connected to the lower end portion 32 in other suitable ways. Alternatively, the number of the weighing devices 100 can also be set to other suitable numbers more than 4 or less than 4, for example, 1, 3, 5, etc.

[0028] In one or more embodiments, before the electric furnace 400 is started, each load-bearing rod 30 is configured to be inclined towards the furnace shell 50, that is, the upper end portion 31 is far from the furnace shell 50 and the lower end portion 32 is close to the furnace shell 50. Through such a configuration, after the furnace shell 50 expands due to heat, it drives the lower end portion 32 to move, so that after the electric furnace enters the working state, the load-bearing rod 30 extends substantially in the vertical direction, and the weight measured by the sensor 10 is more accurate.

[0029] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A weighing device for an electric furnace, characterized in that, The weighing device includes: a sensor; a bracket provided with a through hole extending in the vertical direction; and a load-bearing rod passing through the through hole and including opposite upper and lower ends extending beyond the through hole. The sensor is disposed between the upper end and the bracket. The furnace shell of the electric furnace is adapted to form a fixed connection with the lower end and apply the gravity of the furnace shell to the sensor through the load-bearing rod. The outer diameter of the load-bearing rod is smaller than the aperture of the through hole so that the load-bearing rod can swing in the through hole.

2. The weighing device according to claim 1, characterized in that, The sensor is configured as an annular member and sleeved outside the load-bearing rod. The load-bearing rod includes a pressing ring extending along its circumference. The pressing ring is located above the sensor and can apply pressure to the sensor.

3. The weighing device according to claim 2, wherein the through hole has an opening edge at its upper opening; the load-bearing rod further includes an adjusting ring extending along its circumference. The adjusting ring includes a lower surface configured as a spherical surface. The lower surface is in abutting contact with at least part of the opening edge and can slide relative to the opening edge; the sensor is disposed between the pressing ring and the adjusting ring.

4. The weighing device according to claim 3, characterized in that, A groove is provided on the opening edge. The bottom surface of the groove is configured as a spherical surface matching the lower surface, and the lower surface abuts against the bottom surface.

5. The weighing device according to claim 1, characterized in that, The load-bearing rod is configured as a cylinder.

6. An electric furnace, characterized in that, The electric furnace includes at least one weighing device for an electric furnace according to any one of claims 1-5.

7. The electric furnace according to claim 6, characterized in that, The electric furnace includes a furnace shell and a plurality of the weighing devices. The weighing devices are circumferentially arranged outside the furnace shell, and the furnace shell forms a fixed connection with each of the lower ends.

8. The electric furnace according to claim 6, characterized in that, Before the electric furnace is started, each of the load-bearing rods extends obliquely towards the electric furnace.

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