Double-layer vacuum welding type conductive copper shaft for electroslag remelting furnace

Abstract

The utility model belongs to the electric -slag remelting equipment technical field discloses a double -deck vacuum welding formula conductive copper shaft for electric -slag remelting furnace, including inner layer conductive copper pipe, outer layer conductive copper pipe, seal plate, copper axle terminal, stainless steel pipe, water inlet joint and backwater joint, and inner layer conductive copper pipe coaxial sleeve is located in the outer layer conductive copper pipe inside, the seal plate sealed welding is in one end of inner layer conductive copper pipe and outer layer conductive copper pipe, copper axle terminal sealed welding is in the other end of inner layer conductive copper pipe and outer layer conductive copper pipe, and the sealed cooling water flow through cavity is formed between the outer wall of inner layer conductive copper pipe and the inner wall of outer layer conductive copper pipe, and the side wall of outer layer conductive copper pipe is adjacent to the seal plate respectively and is equipped with water inlet and water outlet. Double -deck vacuum welding formula conductive copper shaft for electric -slag remelting furnace of the utility model adopts double -deck casing pipe vacuum welding structure, cancels the sealing ring part, realizes the permanent sealing of cooling water channel, promotes the equipment stability and reduces the maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of electroslag remelting equipment, specifically relating to a double-layer vacuum welded conductive copper shaft for electroslag remelting furnaces, which is particularly suitable for large-tonnage electroslag remelting production scenarios with high requirements for conductivity, heat dissipation and stability. Background Technology

[0002] Electroslag remelting is a special metallurgical technology that uses the resistance heat generated by the current passing through the molten slag to melt metal. The conductive copper shaft is one of the core components of the electroslag remelting furnace. Its main function is to conduct large current to the consumable electrode. At the same time, it needs to dissipate heat through internal water circulation to avoid deformation of the copper shaft or degradation of its conductivity due to high temperature.

[0003] Traditional conductive copper shafts typically employ a single-layer copper tube with an external sealed end cap. The end cap and copper tube are sealed using a rubber sealing ring to create a cooling water channel. However, in practical use, the following prominent problems exist: (1) The sealing ring is prone to aging and failure: The working environment of the conductive copper shaft is high temperature and high current. The rubber sealing ring is in a high temperature, high pressure and electrochemical corrosion environment for a long time, which makes it very easy to age, harden and crack, resulting in cooling water leakage. Water leakage will not only affect the heat dissipation effect, but may also cause safety accidents such as short circuit and equipment shutdown; (2) High maintenance frequency and high cost: The service life of the sealing ring is usually short and it needs to be replaced regularly. This not only increases the cost of spare parts procurement, but also occupies a lot of production time and reduces the equipment operating rate. (3) The sealing structure affects the conductivity: The traditional sealing end cap is connected to the copper tube by bolts. There is contact resistance at the connection. After long-term use, the contact resistance will increase due to oxidation and loosening, which will cause the copper shaft to heat up more, further accelerating the aging of the sealing ring and forming a vicious cycle.

[0004] Therefore, developing a conductive copper shaft that requires no sealing ring, has good sealing performance, and has low maintenance costs is the key to overcoming the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a double-layer vacuum-welded conductive copper shaft for electroslag remelting furnaces. It adopts a double-layer sleeve vacuum welding structure, eliminates the sealing ring component, achieves permanent sealing of the cooling water channel, improves equipment stability and reduces maintenance costs.

[0006] The technical solution to achieve the above objective is: a double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace, comprising an inner conductive copper tube, an outer conductive copper tube, a sealing plate, copper shaft terminals, a stainless steel tube, a water inlet connector, and a water return connector, wherein: The inner conductive copper tube is coaxially sleeved inside the outer conductive copper tube. The sealing plate is sealed and welded to one end of the inner conductive copper tube and the outer conductive copper tube, and the copper shaft terminal is sealed and welded to the other end of the inner conductive copper tube and the outer conductive copper tube. The two ends of the inner conductive copper tube and the outer conductive copper tube form a closed connection, and a sealed cooling water flow cavity is formed between the outer wall of the inner conductive copper tube and the inner wall of the outer conductive copper tube. The outer conductive copper tube has an inlet and an outlet on the side wall adjacent to the sealing plate, the inlet connector is sealed and welded to the inlet, and the return connector is sealed and welded to the outlet. The stainless steel pipe is installed inside the cooling water flow chamber, with one end of the stainless steel pipe connected to the water inlet connector and the other end extending to the copper shaft terminal.

[0007] The aforementioned double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace comprises: an outer conductive copper tube made of phosphorus-deoxidized copper seamless steel pipe; an inner conductive copper tube made of T2 copper seamless steel pipe; a sealing plate made of phosphorus-deoxidized copper; copper shaft terminals made of phosphorus-deoxidized copper; and water inlet and outlet connectors made of phosphorus-deoxidized copper.

[0008] The aforementioned double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace, wherein the outer diameter of the stainless steel tube matches the inner diameter of the water inlet connector.

[0009] The aforementioned double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace has an electrode connection terminal on the outer side of the copper shaft terminal for connecting to the consumable electrode of the electroslag remelting furnace.

[0010] The aforementioned double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace has an annular cross-section in the cooling water flow cavity.

[0011] The double-layer vacuum-welded conductive copper shaft for electroslag remelting furnaces of this invention has the following beneficial effects: (1) Eliminate sealing rings and eliminate water leakage hazards: This utility model adopts a double-layer vacuum welding structure and the cooling water channel is an integrated sealed structure. There is no need to use rubber sealing rings, which completely solves the water leakage problem caused by the aging of sealing rings in traditional structures and improves the safety of equipment operation. (2) Reduce maintenance costs and increase operating rate: The seal-free design reduces the frequency of spare parts replacement, eliminates the need for regular downtime maintenance, significantly reduces the labor and spare parts costs of equipment maintenance, and extends the continuous operation time of the equipment to improve production efficiency; (3) Excellent electrical conductivity and heat dissipation performance: The combination of outer layer phosphorus deoxidized copper and inner layer T2 copper takes into account both corrosion resistance and high electrical conductivity. The 31.5mm wide annular cooling water flow cavity realizes all-round uniform heat dissipation, avoids local overheating, and extends the service life of the conductive copper shaft. (4) Stable structure and strong adaptability: Vacuum welding has high weld strength and good sealing performance, which can adapt to the harsh working environment of high temperature, high pressure and strong current in electroslag remelting furnace, and is suitable for electroslag remelting equipment of various tonnages. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the double-layer vacuum-welded conductive copper shaft for the electroslag remelting furnace of this utility model. Figure 2 This is a schematic diagram of the cross-sectional structure at the inlet and outlet of the double-layer vacuum-welded conductive copper shaft for the electroslag remelting furnace of this utility model. Detailed Implementation

[0013] To enable those skilled in the art to better understand the technical solution of this utility model, its specific embodiments are described in detail below with reference to the accompanying drawings: Please see Figure 1 and Figure 2 The preferred embodiment of this utility model is a double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace, comprising an inner conductive copper tube 2, an outer conductive copper tube 1, a sealing plate 3, a copper shaft terminal 4, a stainless steel tube 5, a water inlet connector 6, and a water return connector 7.

[0014] An inner conductive copper tube 2 is coaxially sleeved inside an outer conductive copper tube 1. Their ends are connected by a vacuum welding process, forming a sealed cooling water flow cavity 8 between the outer wall of the inner conductive copper tube 2 and the inner wall of the outer conductive copper tube 1. Specifically, a sealing plate 3 is welded to one end of the inner conductive copper tube 2 and the outer conductive copper tube 1, and a copper shaft terminal 4 is welded to the other end of the inner conductive copper tube 2 and the outer conductive copper tube 1, thus forming a sealed connection between the two ends of the inner conductive copper tube 2 and the outer conductive copper tube 1. The vacuum weld is an annular weld, free of pores and cracks. The cooling water flow cavity 8 has an annular cross-section and a width of 31.5 mm, designed to accommodate cooling water and achieve uniform heat dissipation.

[0015] The outer conductive copper tube 1 has an inlet and an outlet on its side wall adjacent to the sealing plate. The inlet connector 6 is sealed and welded to the inlet, and the return connector 7 is sealed and welded to the outlet. A stainless steel tube 5 is installed inside the cooling water flow chamber 8, with one end connected to the inlet connector 6 and the other end extending to the far end of the cooling water flow chamber 8 (at the copper shaft terminal), used to transport cooling water to the end of the cooling water flow chamber 8. The outer diameter of the stainless steel tube 5 matches the inner diameter of the inlet connector 6, and one end of the stainless steel tube 5 is inserted into the inlet connector 6, with the two welded together using a water seal.

[0016] The present invention relates to a double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace, wherein the water inlet connector 6 and the water return connector 7 are located on the same circumference, for example, the included angle α between the two can be 35°.

[0017] The entire conductive copper shaft has no external seals. Electrode connection terminals are provided on the outside of copper shaft terminal 4 for connecting to the consumable electrode of the electroslag remelting furnace.

[0018] The double-layer vacuum-welded conductive copper shaft for electroslag remelting furnaces of this invention has the following characteristics: (1) Structural parameters and material selection: The outer conductive copper tube 1 is made of phosphorus deoxidized copper seamless steel pipe. This material is resistant to high temperature corrosion and has excellent welding performance, making it suitable for the harsh working conditions of the electroslag remelting furnace. The inner conductive copper tube 2 is made of T2 copper seamless steel pipe. T2 copper has high conductivity, which can reduce energy loss during current transmission and ensure the smelting efficiency of electroslag remelting. After the inner and outer copper tubes are coaxially sleeved, an annular cooling water flow cavity 8 with a width of 31.5mm is formed. The ample cavity space can accommodate a large flow of cooling water and improve heat dissipation efficiency.

[0019] (2) End sealing and terminal structure: The water inlet side is sealed with a phosphorus deoxidized copper plate. The end of the sealing plate 3 and the inner and outer conductive copper tubes are connected by vacuum sealing welding to form a gapless closed structure to prevent cooling water from leaking from the end. The far end is provided with a phosphorus deoxidized copper copper shaft terminal 4, which is vacuum sealed and welded to the end of the inner and outer conductive copper tubes. This not only achieves the sealing of the far end of the flow cavity, but also serves as a conductive connection end to ensure that the current is stably conducted from the copper shaft terminal to the consumable electrode.

[0020] (3) Inlet and outlet water connection design: The inlet and outlet water connectors are made of phosphorus deoxidized copper of the same material as the outer copper pipe. They are fixed to the water inlet side of the outer copper pipe by vacuum sealing welding to ensure the connection strength and sealing performance between the connector and the pipe wall. The inlet water connector needs to be connected to a stainless steel pipe to transport cooling water to the far end of the cooling water flow chamber 8. The two are made of water-sealed welding process. This welding method can meet the water circuit sealing requirements and is more economical than vacuum welding. At the same time, it avoids the compatibility problem of vacuum welding of dissimilar materials such as stainless steel and copper.

[0021] The manufacturing process of the double-layer vacuum-welded conductive copper shaft for the electroslag remelting furnace of this utility model is as follows: (1) Pipe pretreatment: Phosphorus deoxidized copper seamless steel pipe is selected as the outer conductive copper pipe 1, and T2 copper seamless steel pipe is selected as the inner conductive copper pipe 2. The inner and outer walls of the two copper pipes are polished to remove rust, oil and oxide layer. (2) Coaxial fitting and positioning: The inner T2 material conductive copper tube 2 is coaxially fitted into the outer phosphorus deoxidized copper material conductive copper tube 1. The coaxiality of the two is fixed by tooling fixtures to ensure that the width of the annular cavity between the inner and outer copper tubes is uniform. (3) Welding of inlet and outlet water connectors: Open inlet and outlet water inlet on the outer layer of conductive copper pipe 1 on the water inlet side of the conductive copper shaft. Insert the inlet and outlet water connectors made of phosphorus deoxidized purple copper into the corresponding inlet and outlet water ... (4) Welding of the far end terminal: The phosphorus deoxidized purple copper shaft terminal 4 is placed at the far end of the conductive copper shaft. The inner ring of the copper shaft terminal 4 is sleeved on the outer wall of the inner conductive copper tube 2 after processing. It is intermittently welded to the outer wall of the inner conductive copper tube 2 with the sealing plate 3. Then the outer ring of the copper shaft terminal 4 is aligned with the end of the outer conductive copper tube 1. The vacuum sealing welding process is used to weld it to the inner and outer copper tubes, and a conductive connection end is formed at the same time. (5) Welding of the water inlet side sealing plate: The outer diameter of the sealing plate 3 is consistent with the inner diameter of the outer conductive copper tube 1 and aligned with the end of the inner conductive copper tube 2. It is vacuum welded to the inner wall of the outer conductive copper tube 1. At the same time, the sealing plate 3 and the end of the inner conductive copper tube 2 are vacuum sealed and welded to complete the near end sealing of the cooling water flow cavity 8. After the welding is completed, the weld is checked for pores and cracks, the tensile strength of the weld is checked, and a water pressure test is performed to ensure that there is no water leakage. (6) Assembly and trial use: Connect the conductive copper shaft to the consumable electrode of the electroslag remelting furnace through the copper shaft terminal 4, and connect the inlet and outlet water connector 6 to the cooling water circulation system; start the equipment to carry out the electroslag steel smelting operation, and the cooling water is transported to the far end of the flow cavity through the stainless steel pipe 5, and then flows in the opposite direction along the annular cavity and is discharged from the outlet water connector.

[0022] The double-layer vacuum-welded conductive copper shaft for electroslag remelting furnace of this invention has been running continuously for several months without water leakage, exhibits stable conductivity, improves heat dissipation uniformity compared to traditional structures, and reduces maintenance costs.

[0023] In summary, the double-layer vacuum-welded conductive copper shaft for electroslag remelting furnaces of this invention utilizes phosphorus-deoxidized copper material to ensure excellent electrical and thermal conductivity and corrosion resistance. The vacuum welding process achieves permanent sealing of the cooling water channel, and the single-sided arrangement of the water inlet combined with the stainless steel water pipe optimizes the cooling water delivery path. This solves the problems of water leakage, frequent maintenance, and decreased conductivity caused by aging of the sealing ring in traditional conductive copper shafts, significantly reducing equipment maintenance costs, improving operational stability and service life, and making it suitable for long-term continuous operation of various large-tonnage electroslag remelting furnaces.

[0024] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.

Claims

1. A double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace, characterized in that, It includes an inner conductive copper tube, an outer conductive copper tube, a sealing plate, copper shaft terminals, a stainless steel tube, an inlet connector, and an outlet connector, wherein: The inner conductive copper tube is coaxially sleeved inside the outer conductive copper tube. The sealing plate is sealed and welded to one end of the inner conductive copper tube and the outer conductive copper tube, and the copper shaft terminal is sealed and welded to the other end of the inner conductive copper tube and the outer conductive copper tube. The two ends of the inner conductive copper tube and the outer conductive copper tube form a closed connection, and a sealed cooling water flow cavity is formed between the outer wall of the inner conductive copper tube and the inner wall of the outer conductive copper tube. The outer conductive copper tube has an inlet and an outlet on the side wall adjacent to the sealing plate, the inlet connector is sealed and welded to the inlet, and the return connector is sealed and welded to the outlet. The stainless steel pipe is installed inside the cooling water flow chamber, with one end of the stainless steel pipe connected to the water inlet connector and the other end extending to the copper shaft terminal.

2. The double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace according to claim 1, characterized in that, The outer conductive copper tube is made of phosphorus-deoxidized copper seamless steel pipe; the inner conductive copper tube is made of T2 copper seamless steel pipe; the sealing plate is made of phosphorus-deoxidized copper; the copper shaft terminal is made of phosphorus-deoxidized copper; and the inlet and outlet water connectors are made of phosphorus-deoxidized copper.

3. The double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace according to claim 1, characterized in that, The outer diameter of the stainless steel pipe matches the inner diameter of the water inlet connector.

4. A double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace according to claim 1, characterized in that, An electrode connection terminal is provided on the outside of the copper shaft terminal for connecting to the consumable electrode of the electroslag remelting furnace.

5. A double-layer vacuum-welded conductive copper shaft for an electroslag remelting furnace according to claim 1, characterized in that, The cross-section of the cooling water flow cavity is annular.

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