Electrode for direct current arc furnace

Abstract

The utility model relates to the technical field of electrode, disclose a kind of electrode for direct current electric arc furnace, including the joint of electrode and joint hole, thread is double line T type buckle, in the cylindrical joint hole of same electrode, the joint processing two parallel and phase difference 180 °'s T type buckle thread, form two independent thread entrances, pitch is 6.34mm, 8.47mm etc.;Electrode end surface sets up triangular center positioning ring;Two electrode contact end face is concave, concave degree 0.1-0.3mm.Electrode diameter 960-1400mm, joint diameter is 75% of electrode diameter, joint hole diameter is joint diameter plus 6mm, electrode joint length is not less than 270mm, joint hole depth is joint length plus 15mm.The utility model improves connection efficiency by double line T type buckle thread, triangular center positioning ring guarantees coaxiality, concave end surface improves thermal shock resistance, size cooperation ensures firm connection, solve the existing electrode connection efficiency low, coaxiality is insufficient, easy to drop furnace and so on.

Description

Technical Field

[0001] This utility model relates to the field of electrodes, and in particular to an electrode for a DC submerged arc furnace. Background Technology

[0002] Circular electrode products for smelting are usually connected by an integral threaded electrode conical connector and a connector hole. There are also connection forms using electrodes and separate cylindrical connectors. Most carbon production enterprises keep the thread shape and size of the electrodes and connectors consistent during processing, and the thread type, angle and clearance fit of the connection parts are the same.

[0003] The electrodes described above have low connection efficiency during connection; and in actual use, due to electrode connection accuracy issues and uneven end faces, gaps may easily appear at the connection, and silicon material may mix in from the electrode end face seam; the design gap between the connector and the connector hole may cause the electrode connection to be misaligned, resulting in the electrode female thread cracking and falling out of the furnace.

[0004] Based on this, we propose an electrode for a DC submerged arc furnace; the integrated cylindrical double-line T-type threaded connection of this invention can effectively improve electrode installation efficiency, improve electrode coaxiality, improve the electrode's thermal shock resistance and reduce furnace drop rate. Utility Model Content

[0005] To address the technical issues of low connection efficiency in existing electrodes and the potential for gaps at the connection points due to electrode connection accuracy problems and uneven end faces, this invention provides an electrode for DC submerged arc furnaces.

[0006] This utility model is achieved using the following technical solution: an electrode for a DC submerged arc furnace, comprising an electrode connector and a connector hole, the thread being a double-threaded T-type thread; two parallel T-type threads with a phase difference of 180° are machined in the cylindrical connector hole and connector of the same electrode to form two independent thread inlets, with a thread pitch of 6.34mm, 8.47mm, 12.7mm, 25.4mm or 50.8mm; a triangular central positioning ring is provided on the electrode end face; the contact end faces of the two electrodes are concave, with a concavity of 0.1-0.3mm.

[0007] As a further optimization of this utility model, the electrode diameter is 960-1400mm. This size design is suitable for large-scale DC submerged arc furnaces and can meet the high-power smelting requirements.

[0008] As a further optimization of this utility model, the diameter of the connector is 75% of the diameter of the electrode, and the diameter of the connector hole is the diameter of the connector plus 6mm. This size matching ensures the strength of the connector, makes the size ratio of the connector and the electrode body more reasonable, provides a certain operating space for installation, and ensures the tightness of the connection.

[0009] As a further optimization of this utility model, the length of the electrode connector is not less than 270mm, and the depth of the connector hole is the connector length plus 15mm, which ensures that the thread has sufficient engagement length, avoids insecure connection due to insufficient engagement length, and further reduces the risk of the electrode falling out of the furnace.

[0010] As a further optimization of this utility model, the side length of the triangular central positioning ring is 1 / 2 to 1 / 4 of the electrode pitch. When the two electrodes are docked, the triangular central positioning rings first engage with each other. By utilizing the geometric stability of the triangle, the electrode connector and the connector hole are forced to remain on the same straight line, which effectively solves the problem of non-concentric connection caused by the design gap between the connector and the connector hole, and ensures the coaxiality of the electrode docking.

[0011] As a further optimization of this utility model, the electrode connector and connector hole adopt an integrated cylindrical structure design, which enhances the overall structural strength and stability of the electrode and reduces the potential for failure at the connection point.

[0012] As a further optimization of this utility model, the tooth profile of the double-threaded T-type thread is T-shaped, with the two threads arranged in parallel and having a phase difference of 180°. During connection, the two threads can exert force simultaneously. Compared with the traditional single-threaded thread, the axial movement distance of the double-threaded T-type thread is twice that of the single-threaded thread under the same number of rotations, thereby improving the electrode installation efficiency by nearly double.

[0013] As a further optimization of this utility model, the concave shape of the contact end face of the two electrodes is a regular concave surface with a concavity degree in the range of 0.1mm to 0.3mm. This can provide a buffer space for the thermal expansion and contraction of the electrodes, reduce stress concentration to improve thermal shock resistance, and make the joint tight and reduce silicon material mixing.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model employs a double-threaded T-shaped connection. Two parallel T-shaped threads with a 180° phase difference are machined into the cylindrical connector hole and connector of the same electrode, forming two independent thread entrances with pitches of 6.34mm and 8.47mm, respectively. During connection, both threads exert force simultaneously, resulting in twice the axial movement distance of traditional single-threaded connections for the same number of rotations. This significantly improves electrode connection efficiency, nearly doubling it compared to traditional methods, effectively solving the problem of low connection efficiency.

[0015] 2. This utility model incorporates a triangular central positioning ring on the electrode end face, with a side length of 1 / 2 to 1 / 4 of the electrode pitch. During docking, the triangular central positioning rings first engage with each other, utilizing the geometric stability of the triangle to force the electrode connector and connector hole to remain coaxial. This reduces the coaxiality error of the electrode docking from the traditional 0.5mm / m to below 0.1mm / m, solving the problem of the female thread cracking and falling out of the furnace due to misalignment.

[0016] 3. This utility model designs the contact surfaces of the two electrodes as regular concave surfaces with a concavity of 0.1-0.3mm. This design provides buffer space for the thermal expansion and contraction of the electrodes, reduces stress concentration, improves thermal shock resistance, and ensures a tight joint.

[0017] 4. This utility model, through a reasonable design of overall dimensions, features an electrode diameter of 960-1400mm, a connector diameter of 75% of the electrode diameter, a connector hole diameter 6mm larger than the connector diameter, an electrode connector length ≥270mm, and a connector hole depth equal to the connector length plus 15mm. This ensures connector strength and sufficient installation and operating space, guarantees adequate thread engagement length, reduces the risk of the electrode falling out of the furnace, and improves connection firmness and stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Schematic diagram of a double-threaded T-type threaded connection structure; Figure 3 This utility model Figure 1 Schematic diagram of the connection structure of the center positioning guide ring of the middle electrode.

[0019] Explanation of key symbols: Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] Example 1: Please combine Figures 1-3 This embodiment proposes an electrode for a DC submerged arc furnace, including an electrode connector and a connector hole, with a double-threaded T-type thread; the electrode connector and connector hole adopt an integrated cylindrical structure design.

[0022] Two parallel T-shaped threads with a 180° phase difference are machined on the cylindrical connector hole of the same electrode to form two independent thread entrances; the thread pitch is 6.34mm, 8.47mm, 12.7mm, 25.4mm or 50.8mm; a triangular center positioning ring is set on the electrode end face; the contact end face of the two electrodes is concave, and the concavity of the end face is 0.1-0.3mm.

[0023] The specific technical solution involves two parallel threads 4 with a 180° phase difference, allowing for simultaneous force application from both threads during connection. Compared to traditional single-threaded threads, the axial movement distance of the double-threaded T-type thread 4 is twice that of a single-threaded thread under the same number of rotations, thereby nearly doubling the electrode installation efficiency.

[0024] In layman's terms: The electrode body and connector adopt an integrated cylindrical design, connected by a double-threaded T-shaped thread. It's like two water pipes being screwed together with special threads, except here the threads are two parallel T-shaped threads that are 180° apart, forming two independent thread inlets.

[0025] It should be noted that the electrode diameter A is 960-1400mm.

[0026] Wherein, the connector diameter C is equal to 75% of the electrode diameter A, and the connector hole diameter B is equal to the connector diameter C plus 6mm. The electrode connector length E is not less than 270mm, and the connector hole depth D is equal to the connector length E plus 15mm.

[0027] Furthermore, the connector diameter C is designed to be 75% of the electrode diameter A, ensuring connector strength while making the size ratio between the connector and the electrode body more reasonable. The connector hole diameter B is 6mm larger than the connector diameter C, providing sufficient operating space for installation while ensuring a tight connection.

[0028] Furthermore, the electrode connector length E is not less than 270mm, and the connector hole depth D is 15mm longer than the connector length E, ensuring that the thread 4 has sufficient engagement length, avoiding insecure connection due to insufficient engagement length, and further reducing the risk of the electrode falling out of the furnace.

[0029] A further technical solution involves a triangular central positioning ring with a side length of 1 / 2 to 1 / 4 of the electrode pitch. A triangular central positioning ring 2 is positioned on the electrode end face, with a side length L of 1 / 2 to 1 / 4 of the double-threaded pitch P. When the two electrodes are mated, the triangular central positioning rings 2 first engage with each other. Utilizing the geometric stability of the triangle, this forces the electrode connector 1 and the connector hole 3 to remain on the same straight line, effectively solving the problem of misalignment caused by the design gap between the connector and the connector hole, and ensuring the coaxiality of the electrode mating.

[0030] Among them, the tooth profile of the double-line T-type thread is T-type, with the two threads set in parallel and with a phase difference of 180°.

[0031] The concave shape of the contact end face of the two electrodes is a regular concave surface, and the concavity degree is in the range of 0.1mm to 0.3mm.

[0032] A more specific technical solution involves concave contact surfaces of the two electrodes, with a concavity of 0.1-0.3 mm. During operation of a DC submerged arc furnace, temperature fluctuations are drastic, causing stress on the electrodes due to thermal expansion and contraction. The concave contact surfaces provide a buffer space for this thermal expansion and contraction, reducing stress concentration and improving the electrodes' thermal shock resistance.

[0033] If the electrode end faces of traditional electrodes are uneven, impurities such as silicon can easily get mixed in at the joint. However, the concave end face of this patent allows for a tighter contact between the two electrodes, effectively reducing the possibility of impurities getting in from the joint of the electrode end faces.

[0034] The working principle of this patent: I. Connection Principle of Double-Thread T-Type Thread 4 Structural design: Two parallel T-shaped threads 4 with a phase difference of 180° are machined on the cylindrical connector hole of the same electrode to form two independent thread entrances. The double-thread pitch P is 6.34mm, 8.47mm, 12.7mm, 25.4mm or 50.8mm.

[0035] The two threads 4 are set in parallel with a phase difference of 180°, allowing for simultaneous force application from both threads during connection. Compared to traditional single-threaded threads, the axial movement distance of the double-threaded T-type thread 4 is twice that of a single-threaded thread under the same number of rotations, thus nearly doubling the electrode installation efficiency.

[0036] In layman's terms: The electrode body and connector adopt an integrated cylindrical design, connected by a double-threaded T-shaped thread. It's like two water pipes being screwed together with special threads, except here the threads are two parallel T-shaped threads that are 180° apart, forming two independent thread inlets.

[0037] II. Coaxial Positioning Principle of Triangular Central Positioning Ring 2 Structural Design: A triangular central positioning ring 2 is set on the electrode end face, with the side length L of the central positioning ring being 1 / 2 to 1 / 4 of the double-threaded pitch P. When the two electrodes are mated, the triangular central positioning rings 2 first engage with each other. Utilizing the geometric stability of the triangle, the electrode connector 1 and the connector hole 3 are forced to remain on the same straight line, effectively solving the problem of non-concentricity caused by the design gap between the connector and the connector hole, and ensuring the coaxiality of the electrode mating.

[0038] III. Stress Buffering and Impurity Prevention Principle of Concave End Faces Structural Design: The contact surfaces of the two electrodes are concave, with a concavity of 0.1-0.3 mm. During operation of a DC submerged arc furnace, the temperature fluctuates drastically, causing stress on the electrodes due to thermal expansion and contraction. The concave end faces provide a buffer space for this thermal expansion and contraction, reducing stress concentration and improving the electrodes' thermal shock resistance.

[0039] If the electrode end faces of traditional electrodes are uneven, impurities such as silicon can easily get mixed in at the joint. However, the concave end face of this patent allows for a tighter contact between the two electrodes, effectively reducing the possibility of impurities getting in from the joint of the electrode end faces.

[0040] IV. Working Principle of Overall Dimensional Fit Structural design: The electrode diameter A is 960-1400mm.

[0041] The connector diameter C is equal to 75% of the electrode diameter A, and the connector hole diameter B is equal to the connector diameter C plus 6mm. The electrode connector length E is not less than 270mm, and the connector hole depth D is equal to the connector length E plus 15mm.

[0042] The connector diameter C is designed to be 75% of the electrode diameter A, ensuring connector strength while making the size ratio between the connector and the electrode body more reasonable. The connector hole diameter B is 6mm larger than the connector diameter C, which provides sufficient operating space for installation while ensuring a tight connection.

[0043] The electrode connector length E is not less than 270mm, and the connector hole depth D is 15mm longer than the connector length E, ensuring that the thread 4 has sufficient engagement length, avoiding insecure connection due to insufficient engagement length, and further reducing the risk of the electrode falling out of the furnace.

[0044] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An electrode for a DC submerged arc furnace, characterized in that, The electrode includes a connector and connector hole with a double-threaded T-type thread. Two parallel T-type threads with a 180° phase difference are machined in the cylindrical connector hole and connector of the same electrode to form two independent thread entrances. The thread pitch is 6.34mm, 8.47mm, 12.7mm, 25.4mm or 50.8mm. A triangular center positioning ring is set on the electrode end face. The contact end faces of the two electrodes are concave, with a concavity of 0.1-0.3mm.

2. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The diameter of the electrode is 960-1400 mm.

3. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The diameter of the connector is 75% of the diameter of the electrode, and the diameter of the connector hole is the diameter of the connector plus 6 mm.

4. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The electrode connector is at least 270 mm long, and the connector hole depth is the connector length plus 15 mm.

5. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The side length of the triangular central positioning ring is 1 / 2 to 1 / 4 of the electrode pitch.

6. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The electrode connector and connector hole adopt an integrated cylindrical structure design.

7. The electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The thread profile of the double-thread T-type snap is T-shaped, with the two threads arranged in parallel and having a phase difference of 180°.

8. An electrode for a DC submerged arc furnace as described in claim 1, characterized in that, The concave shape of the contact end face of the two electrodes is a regular concave surface, and the concavity degree is in the range of 0.1mm to 0.3mm.

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