Atmosphere-maintaining electroslag furnace repairing method

Abstract

The invention provides a repairing method of an atmosphere-maintaining electroslag furnace, which comprises the following steps: processing a crack guide opening in a self-damage locking piece, mounting an external thread of a transition head into a threaded hole of a lower furnace leg to form an adhesive accommodating gap, filling an adhesive into the adhesive accommodating gap, and curing to form a consolidation layer, so as to repair the atmosphere-maintaining electroslag furnace. The lower oven leg and the transition head are bonded and solidified to form a whole, the whole is assembled on the oven leg base, a self-damage locking piece is installed on the connecting piece, and the transition head and the oven leg base are locked through the self-damage locking piece. Therefore, the connecting structure between the lower furnace leg and the furnace leg base is efficiently, conveniently and firmly repaired.

Description

Technical Field

[0001] This application relates to the field of metallurgical equipment technology, and more specifically, to a method for repairing an electroslag furnace that maintains an atmosphere. Background Technology

[0002] Electroslag remelting (ESR) technology, due to its excellent material purification capabilities, is widely used in the preparation of high-end alloy steels and special materials. With the increasing size and compact structure of ESR furnaces, the mechanical layout space of the smelting station is limited, resulting in extremely small gaps between key conductive components (such as the lower furnace legs and guide plates) and moving components (such as the crystallizer and bottom water tank). In existing technologies, the lower furnace legs are made of aluminum alloy and connected to a fixed plate via clamps, forming a conductive and support structure in conjunction with the guide plates. However, during hoisting operations, the narrow operating space (minimum spacing of only 5mm) easily leads to mechanical interference, causing damage to the connecting structures such as the lower furnace legs and guide plates, resulting in positioning failure and ultimately thermal shutdown of the equipment. Traditional repair methods are time-consuming (usually more than 1.5 hours), and the repair cost of aluminum alloy components is high, severely impacting production efficiency and increasing production costs. Summary of the Invention

[0003] This application provides a repair method for a sustained atmosphere electroslag furnace, which enables rapid reset and functional restoration of easily damaged parts of the sustained atmosphere electroslag furnace, improves repair efficiency, and effectively reduces equipment downtime.

[0004] This application provides a repair method for an atmosphere-maintaining electroslag furnace. The repair method is applied to the repair of fractures in the connection structure between the lower furnace leg and the furnace leg base of the electroslag furnace. The connection structure includes a threaded hole at the bottom of the lower furnace leg, a transition head, a connector, and a self-damaging locking member. At least a portion of the transition head is provided with external threads, which are used to make clearance fit with the threaded hole. An adhesive accommodating gap is formed between the threaded hole and the transition head. The connector is used to connect the furnace leg base and the transition head. The self-damaging locking member is provided with a crack inlet for locking the connector and the furnace leg base.

[0005] The repair method includes:

[0006] A crack initiation point is machined into the self-damaging locking component;

[0007] Insert the external thread of the transition head into the threaded hole of the lower furnace leg;

[0008] The adhesive is filled into the adhesive accommodating gap and cured to form a solidified layer;

[0009] The lower furnace leg and the transition head are bonded and cured together to form an integral assembly, which is then assembled onto the furnace leg base. The connecting piece is connected to the transition head, a self-damaging locking piece is installed on the connecting piece, and the transition head and the furnace leg base are locked together using the self-damaging locking piece.

[0010] In some embodiments, the repair method is also applied to the repair of the fracture of the guide plate of the electroslag furnace. The guide plate includes a guide plate body, a back plate that fits against the guide plate body, and a connecting assembly that connects the back plate and the guide plate body. The upper part of the back plate is provided with a U-shaped hole.

[0011] The repair method for the guide plate includes:

[0012] A U-shaped hole is machined in the middle of the upper edge of the back plate, and a through hole is machined in the lower part of the U-shaped hole.

[0013] Main board through holes are machined on the guide plate body at positions corresponding to the U-shaped hole and the back plate through hole, respectively.

[0014] The back plate is mounted against the guide plate body, and the locking components are respectively passed through the U-shaped hole and the main board through hole, as well as the back plate through hole and the main board through hole, and locked and fixed.

[0015] In some embodiments, the transition head includes a transition head body and a connecting portion, wherein the connecting portion includes a threaded connecting sub-part and a cylindrical connecting sub-part, the cylindrical connecting sub-part is fixedly connected to the transition head body, the threaded connecting sub-part is disposed on the front end face of the cylindrical connecting sub-part near the lower furnace leg, and the threaded connecting sub-part is provided with an external thread;

[0016] The step of inserting the external thread of the transition head into the threaded hole of the lower furnace leg includes:

[0017] The lower part of the threaded connecting part of the connection is ground into a cylindrical connecting part of a predetermined length;

[0018] Clean the impurities adhering to the surfaces of the threaded connector and the cylindrical connector;

[0019] The transition head is radially adjusted so that the coaxiality deviation between the transition head and the lower furnace leg is less than 0.2 mm;

[0020] The threaded connector and the cylindrical connector are inserted into the threaded hole of the lower furnace leg, and the bottom surface of the lower furnace leg is made to fit against the front end face of the transition head body.

[0021] In some embodiments, the adhesive includes an epoxy resin and a curing agent;

[0022] The process of filling the adhesive cavity with adhesive and curing it to form a solidified layer includes:

[0023] Mix the epoxy resin and curing agent evenly according to the preset ratio;

[0024] The well-mixed adhesive is poured into the adhesive receiving gap.

[0025] In some embodiments, the guide plate body includes a guide main plate and a stiffener plate, the stiffener plate being vertically fixed to the middle of the guide main plate, and the guide main plate having four main plate through holes arranged in an array; there are two back plates, respectively disposed on both sides of the stiffener plate;

[0026] The step of mounting the back plate against the guide plate body, and locking the locking components through the U-shaped hole and the main board through hole, and locking the back plate through hole and the main board through hole, includes:

[0027] Weld the guide main plate to the stiffening plate;

[0028] The two back plates are respectively disposed on both sides of the stiffener, and the back plates are abutted against the guide plate and the stiffener;

[0029] Adjust the position of the back plate so that the U-shaped hole is coaxially distributed with the through hole of the main board, and so that the through hole of the back plate is coaxially distributed with the through hole of the main board and the mounting hole of the furnace leg base;

[0030] The locking components are respectively locked to the U-shaped hole and the main board through hole, as well as the back plate through hole, the main board through hole, and the mounting holes of the furnace leg base.

[0031] In some embodiments, the tear inlet is a rectangular tear inlet, the width of the tear inlet is in the range of 0.5mm to 2mm, and the depth of the tear inlet is in the range of 5mm to 10mm.

[0032] In some embodiments, the self-damaging locking element is a self-damaging locking element made of phenolic resin.

[0033] In some embodiments, the threaded connector and the cylindrical connector are of equal length.

[0034] In some embodiments, welding the guide plate and the stiffener plate includes:

[0035] Multiple welded sections are provided at intervals at the joint between the guide plate and the stiffener.

[0036] The guide main plate and the stiffening plate are welded in the welding section area.

[0037] In some embodiments, an unwelded discontinuity is formed between adjacent welded sections, and the ratio of the length of the welded section to the length of the discontinuity ranges from 1:2 to 1:10.

[0038] In this embodiment, the connection structure between the lower furnace leg and the furnace leg base can be quickly repaired with minimal modifications to the lower furnace leg and guide plate, resulting in high repair efficiency and excellent repair effect. After repair, operators can hoist the crystallizer and bottom water tank into and out of the smelting station within a very small space between the lower furnace leg, guide plate, and bottom water tank. The connection strength between the repaired lower furnace leg and transition head is significantly enhanced, greatly reducing the vulnerability rate. Even when the upper truncated cone of the lower furnace leg is suspended and subjected to a large tensile force, the self-damaging locking component can still break and self-damage under the guidance of the crack initiation structure, thereby preventing the connection between the lower furnace leg and transition head from failing. Thus, in subsequent repairs, only the self-damaging locking component needs to be replaced, greatly improving repair efficiency.

[0039] Therefore, the repair method for the electroslag remelting furnace with maintained atmosphere provided in this application can improve the production efficiency of the electroslag remelting furnace with maintained atmosphere and save on the maintenance and production costs of the electroslag remelting furnace. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0041] Figure 1 A schematic flowchart illustrating a method for repairing the lower leg of an electroslag furnace under a maintained atmosphere, provided in some embodiments of this application.

[0042] Figure 2 A schematic flowchart illustrating a method for repairing a guide plate of an electroslag furnace with a maintained atmosphere, provided in some embodiments of this application.

[0043] Figure 3 This is a front view of the lower furnace leg and guide plate of an electroslag furnace for maintaining atmosphere provided in some embodiments of this application;

[0044] Figure 4 A side view of the lower furnace leg and guide plate of an electroslag furnace for maintaining atmosphere, provided for some embodiments of this application;

[0045] Figure 5 This is a schematic diagram showing the connection between the lower furnace leg and the furnace leg base provided in some embodiments of this application;

[0046] Figure 6 for Figure 5 Enlarged image;

[0047] Figure 7 This is a schematic diagram showing the bonding and curing of the lower furnace leg and the transition head according to some embodiments of this application;

[0048] Figure 8 A schematic diagram of a transition head provided for some embodiments of this application;

[0049] Figure 9 A schematic diagram of a self-damaging locking component provided in some embodiments of this application;

[0050] Figure 10 This is an assembly diagram of the lower furnace leg, guide plate, and furnace leg base provided in some embodiments of this application;

[0051] Figure 11 Front view of the backplate provided for some embodiments of this application;

[0052] Figure 12 Side view of the backplate provided for some embodiments of this application;

[0053] Figure 13 Front view of the backplate provided for some embodiments of this application;

[0054] Figure 14 This is an assembly diagram of the back plate and furnace leg base provided in some embodiments of this application;

[0055] Figure 15 for Figure 14 Side view.

[0056] The attached figures are labeled as follows:

[0057] 1-Lower furnace leg; 2-Guide plate; 3-Transition head; 4-Connector; 5-Self-damaging locking component; 6-Cooling water pipe; 7-Back plate; 8-Furnace leg base; 9-Bottom water tank;

[0058] 21-Guide main plate; 22-Firming plate; 31-Transition head body; 32-Connecting part; 51-Opening slot; 71-Back plate through hole; 72-U-shaped hole;

[0059] 321 - Threaded connection sub-part; 322 - Cylindrical connection sub-part. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., are used to distinguish different objects, not to describe a particular order or hierarchy.

[0062] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0066] In this application, "multiple" means two or more (including two).

[0067] Electroslag furnaces have a compact mechanical structure, such as Figure 3 and Figure 4As shown. The distance between the middle of the lower furnace leg, the guide plate, and the copper plate of the bottom water tank is 25mm. The distance between the upper frustum of the lower furnace leg (whose diameter is larger than the middle size of the lower furnace leg and whose outer edge extends beyond the guide plate) and the copper plate of the bottom water tank is 5mm, which is the minimum distance a. The guide plate is used to guide the crystallizer and the bottom water tank, but it cannot completely restrict their radial displacement. It is very difficult for production personnel to operate the remote-controlled crane to lift the crystallizer and the bottom water tank into and out of the smelting station, and the lower furnace leg is often scraped. When lifting the crystallizer and the bottom water tank out of the smelting station, if there is interference between the bottom copper plate and the frustum of the lower furnace leg, the lower furnace leg and the guide plate may be lifted upwards as a whole, causing damage to the weak connection between the lower furnace leg and the guide plate, failure of positioning, replacement of spare parts time of more than 1.5 hours, and resulting in equipment thermal shutdown.

[0068] The lower furnace legs and guide plates are key components of the protective atmosphere electroslag furnace. Both are made of aluminum alloy, resulting in high repair costs and long repair cycles. Failure to repair them can prevent the furnace base from operating normally. Due to the compact space within the furnace base, it is difficult to completely avoid such operational accidents. Therefore, it is necessary to optimize the repair scheme for the lower furnace legs and guide plates to ensure rapid recovery in case of positioning failure, thereby reducing equipment downtime.

[0069] Therefore, the repair method for the atmosphere-maintaining electroslag furnace provided in this application addresses two common fracture problems of key components of the electroslag furnace: 1. fracture of the connection structure between the lower furnace leg and the furnace leg base; 2. fracture of the guide plate. This repair method can efficiently repair the connection structure between the lower furnace leg and the furnace leg base and its guide plate, while ensuring structural strength. Except for the self-damaging locking parts, the other structures after repair will not be damaged again in subsequent operations. The self-damaging locking parts in this application can be directly applied to intact original lower furnace legs to prevent damage to the lower furnace legs, thereby improving production efficiency and saving production and maintenance costs.

[0070] Please refer to Figure 5 , Figure 6 and Figure 7 This application provides a repair method for an electroslag remelting furnace with maintained atmosphere. This method is applied to the repair of fractures in the connection structure between the lower furnace leg and the furnace leg base 8, as well as the repair of fractures in the guide plate 2 of the electroslag remelting furnace. The connection structure includes a threaded hole at the bottom of the lower furnace leg 1, a transition head 3, a connector 4, and a self-damaging locking member 5. At least a portion of the transition head 3 is provided with external threads, which are clearance-fitted with the threaded hole, forming an adhesive accommodating gap between the threaded hole and the transition head 3. The connector 4 connects the furnace leg base 8 and the transition head 3. The self-damaging locking member 5 is provided with a crack inlet 51 for locking the connector 5 and the furnace leg base 8. The guide plate 2 includes a guide plate body, a back plate 7 that fits against the guide plate body, and a connecting assembly connecting the back plate 7 and the guide plate body. A U-shaped hole 72 is provided on the upper part of the back plate 7.

[0071] The threaded hole is located at the bottom center of the lower furnace leg 1. The transition head 3 is provided with a connecting part with external threads. The connecting part 32 is clearance-fitted with the threaded hole so that after assembly, there is an adhesive accommodating gap between the connecting part 32 and the lower furnace leg 1. The transition head and the furnace leg base 8 are connected by connecting parts 4 (such as bolts, pins, etc.).

[0072] The self-damaging locking element 5 can be a nut (such as a conventional nut, a double-ended nut, or a lock-lock nut). The self-damaging locking element 5 has a break-in opening 51, which can be rectangular, U-shaped, or V-shaped. The break-in opening 51 can be a notch structure located on the upper part of the self-damaging locking element 5 and connected to the top surface, or it can be located in the middle or lower part of the self-damaging locking element 5; it can be one or more locations. The break-in opening 51 can break when the guide plate 2 is under tension, generating a locking force. Optionally, the break-in opening 51 is rectangular, with a width of 0.5~2mm and a depth of 5~10mm.

[0073] like Figure 1 As shown. In this embodiment of the application, the repair method for the lower furnace leg 1 includes:

[0074] S110. A crack initiation point 51 is machined on the self-damaging locking part 5;

[0075] S120. Insert the external thread of the transition head 3 into the threaded hole of the lower furnace leg 1;

[0076] S130. Fill the adhesive cavity with adhesive and cure to form a solidified layer;

[0077] S140. After the lower furnace leg 1 and the transition head 3 are bonded and cured, the whole assembly is assembled on the furnace leg base 8. The connecting piece 4 is connected to the transition head 3. The self-damaging locking piece 5 is installed on the connecting piece 4, and the transition head 3 and the furnace leg base 8 are locked by the self-damaging locking piece 5.

[0078] In the existing design, the lower furnace leg 1 is connected and fixed to the furnace leg base 8 via a stainless steel transition head 3. For example, the upper end of the transition head 3 has an M20 external thread, which mates with an M20 stainless steel wire sleeve at the lower end of the lower furnace leg 1. The lower end of the transition head 3 has an M20 threaded hole, which is fixed to the furnace leg base 8 by a hexagonal bolt. Because the lower furnace leg 1 is made of aluminum alloy, the stainless steel wire sleeve installed on the lower furnace leg 1 has a low load-bearing capacity. When the truncated cone of the lower furnace leg 1 is hung, the stainless steel wire sleeve is easily damaged, causing the positioning of the lower furnace leg 1 to fail.

[0079] Applying this method, when repairing the lower furnace leg 1, the damaged stainless steel wire sleeve on the lower furnace leg 1 is removed. An M22 internal thread is tapped into the original hole, and the hole is cleaned thoroughly to avoid oil residue. Adhesive is then poured into the threaded hole of the lower furnace leg 1, and the transition head is radially adjusted to ensure coaxiality. After the adhesive cures, a threaded structure is formed that is fixed between the lower furnace leg 1 and the transition head.

[0080] like Figure 6 As shown, the original transition head 3 and furnace leg base 8 are connected by metal bolts, whose tensile strength is greater than that of the lower furnace leg 1 and transition head 3, which are bonded together. Therefore, it is necessary to change the connection method between the transition head 3 and furnace leg base 8 to make it a weak point to prevent the connection between the lower furnace leg 1 and transition head 3 from failing. In this embodiment, the original hexagonal bolts are replaced with self-damaging locking parts 5 for pre-tightening. The self-damaging locking parts 5 are provided with crack initiation points 51 to guide the self-damaging locking parts 5 to crack and break under abnormal stress. After repair, the installation is as follows. Figure 7 As shown, after the lower furnace leg 1 and the transition head 3 are bonded and cured, the whole assembly is installed on the furnace leg base 8, and then the double-ended bolts are screwed into the transition head 3. The self-damaging locking part 5 has a certain tensile strength and can withstand the force generated by the scraping between the bottom water tank 9 and the middle surface of the lower furnace leg 1. When the upper truncated cone of the lower furnace leg 1 is hung and subjected to a large tensile force, the self-damaging locking part 5 breaks and is damaged under the guidance of the crack inlet 51, thereby preventing the connection between the lower furnace leg 1 and the transition head 3 from failing. After the self-damaging locking part 5 is damaged, it automatically disengages from the double-ended bolts and can be directly replaced. The replacement time is less than 1 minute, the fault handling is extremely fast, and it does not affect normal production. The self-damaging locking part 5 is easy to replace, inexpensive, and very economical. When the furnace base is working normally, the lower furnace leg 1 only bears the vertical downward gravity of the furnace head and electrode rod, so this repair solution fully meets the working requirements. The self-damaging locking part 5 in this application can be, but is not limited to, a nut.

[0081] This application embodiment optimizes the repair scheme of the lower furnace leg 1 by using adhesive technology, which can solve the connection problem between the lower furnace leg 1 and the transition head 3. Through the self-damaging locking part 5, when the lower furnace leg 1 truncated cone is hung, the connection between the lower furnace leg 1 and the transition head 3 is reliable.

[0082] like Figure 8 As shown. In one specific embodiment, the transition head 3 includes a transition head body 31 and a connecting part 32, wherein the connecting part 32 includes a threaded connecting part 321 and a cylindrical connecting part 322. The cylindrical connecting part 322 is fixedly connected to the transition head body 31, and the threaded connecting part 321 is disposed on the front end face of the cylindrical connecting part 322 near the lower furnace leg 1. The threaded connecting part 321 is provided with external threads.

[0083] In step S120 above, inserting the external thread of the transition head 3 into the threaded hole of the lower furnace leg 1 also includes the following steps:

[0084] The lower part of the threaded connecting part 321 of the connecting part 32 is ground into a cylindrical connecting part 322 of a preset length;

[0085] Clean the impurities adhering to the surfaces of the threaded connection sub-part 321 and the cylindrical connection sub-part 322;

[0086] Adjust the transition head 3 radially so that the coaxiality deviation between the transition head 3 and the lower furnace leg 1 is less than 0.2mm;

[0087] Insert the threaded connection part 321 and the cylindrical connection part 322 into the threaded hole of the lower furnace leg 1, and make the bottom surface of the lower furnace leg 1 fit against the front end surface of the transition head body 31.

[0088] For example, refer to Figure 8 In this embodiment, the damaged external thread of the transition head 3 is modified by grinding the lower part of the original M20 external thread into a cylinder of approximately φ16, while retaining the upper part of the damaged external thread, and cleaning the entire structure. Then, adhesive is poured into the adhesive accommodating gap to fill the thread fit gap and the gap between the transition head and the hole wall. The cylindrical connecting part 322 of the transition head 3 is used to compensate for the thread damage and improve the tensile strength of the bonded structure.

[0089] In one specific embodiment, the adhesive includes epoxy resin and a curing agent. The adhesive selected is an epoxy resin adhesive with high strength, temperature resistance, chemical corrosion resistance, and suitability for metal bonding. The epoxy resin and curing agent are mixed evenly at a 1:1 ratio and poured into the threaded hole of the lower furnace leg 1. The cylindrical connecting part 322 of the transition head is then inserted into the threaded hole of the threaded connecting part 321. The transition head 3 is radially adjusted so that the coaxiality deviation between the transition head 3 and the lower furnace leg 1 is less than 0.2 mm. After curing, the transition head 3 is connected to the lower furnace leg 1, as shown below. Figure 6 and Figure 7 As shown.

[0090] Step S130 above: Filling the adhesive cavity with adhesive and curing to form a solidified layer, specifically includes: mixing epoxy resin and curing agent evenly according to a preset ratio; pouring the evenly mixed adhesive into the adhesive cavity. Using this method, the bonding strength is high, the adhesion is good, and it can prevent the lower furnace leg 1 from detaching from the transition head 3.

[0091] The self-damaging locking component 5 is made of phenolic resin, which is more brittle than epoxy resin. Figure 9 As shown, a tear inlet 51 is sawn at the middle of one end of the self-damaging locking member 5. The tear inlet 51 can be set at the upper end of the self-damaging locking member and extends vertically downward from the upper end face. Optionally, the width of the tear inlet 51 is in the range of 0.5mm to 2mm, and the depth of the tear inlet 51 is in the range of 5mm to 10mm. Among them, the tear inlet effect is best when the width of the tear inlet 51 is 1mm and the depth is 8mm.

[0092] In step S140 above, the self-damaging locking member 5 is used to lock the transition head 3 and the furnace leg base 8, including: screwing the connector 4 into the transition head 3; installing the self-damaging locking member 5 so that the crack inlet 51 is installed on the side facing the transition head 3; and locking the self-damaging locking member 5. After the lower furnace leg 1 and the transition head 3 are bonded and cured, they are installed as a whole onto the furnace leg base 8, and then the double-ended bolt is screwed into the transition head 3. Finally, the self-damaging locking member 5 is installed with the crack inlet 51 facing the transition head 3.

[0093] like Figure 2 As shown. The method for repairing the guide plate 2 of the connection structure between the lower furnace leg 1 and the furnace leg base 8 in this embodiment includes:

[0094] S150. A U-shaped hole 72 is machined in the middle of the upper edge of the back plate 7, and a back plate through hole 71 is machined in the lower part of the U-shaped hole 72.

[0095] S160. Machining main board through holes on the guide plate body corresponding to the positions of U-shaped hole 72 and back plate through hole 71 respectively;

[0096] S170. Mount the back plate against the guide plate body, and lock the locking components through the U-shaped hole 72 and the main board through hole, and the back plate through hole 71 and the main board through hole respectively.

[0097] In step S150, through holes 71 and U-shaped holes 72 are machined on the back plate 7. The number of through holes and U-shaped holes 72 can be one or more.

[0098] In step S160, through holes are machined on the guide plate 2 at positions corresponding to the back plate through hole 71 and the U-shaped hole 72, respectively, for mounting the back plate 7.

[0099] In step S170, the back plate 7 is mounted against the guide plate body, the bolts are inserted into the back plate through hole 71 and the detached guide plate body, and the bolts are fixed to the furnace leg base 8 with nuts. Then, the bolts are passed through the U-shaped hole 72 and the main plate through hole and fixed with nuts to achieve the connection and fastening between the back plate 7 and the guide plate body.

[0100] The existing repair solution for guide plate 2 involves grinding and cleaning the broken part of the detached guide plate 2, then welding it to the main guide plate 2 using aluminum welding, and repairing the torn weld between the two. This solution has high repair costs, long repair time, and cannot solve the problem of guide plate 2 being damaged again after the lower furnace leg 1 pedestal is hung.

[0101] To address this, this application provides a guide plate repair method. The back plate 7 can quickly repair the broken structure of the guide plate body, ensuring a stable connection between it and the unbroken structure and the furnace leg base. This method requires minimal modification to the guide plate. After repair, when the furnace leg frustum is suspended and subjected to significant tension, the U-shaped hole can guide the guide plate body and its connecting components to detach from the top of the U-shaped hole on the back plate. This greatly shortens the subsequent repair time of the guide plate. The repaired guide plate can be reused, reducing operating costs.

[0102] like Figure 10 As shown in the figure. The repair scheme for guide plate 2 in this embodiment uses a movable back plate 7 connected by bolts to fix the detached guide plate 2 to the main guide plate. The pre-tightening force of the bolts between the back plate 7 and the guide plate 2 provides a large frictional force, capable of withstanding the force generated by the scraping between the bottom water tank 9 and the middle surface of the lower furnace leg 1. When the lower furnace leg 1 is hung on a large tensile force, the guide plate body and its connecting bolts come off from above the U-shaped hole 72 on the back plate, causing the lower end of the guide plate 2 to fail to position itself. The troubleshooting process is as follows: loosen the bolts on the main body of the guide plate, insert the bolts into the U-shaped hole 72 on the back plate, and tighten them. Applying this repair scheme can quickly resolve the fault, with a processing time of less than 10 minutes, and the repaired guide plate 2 can be reused repeatedly, resulting in extremely low operating costs.

[0103] For example, such as Figure 11 and Figure 12 As shown. The back plate 7 is made of 10mm thick steel plate, 50mm wide, with a φ20 through hole machined at the bottom and a 20mm wide U-shaped hole 72 machined at the top. The center distance between the arc of the through hole 71 and the U-shaped hole 72 is 200mm. Figure 12 As shown, when machining the guide plate body, drill one φ20 through hole at the intersection of the center of the original lower positioning hole (220mm away) and the center line of the guide plate main plate 21 on both sides of the stiffener 22, for mounting the back plate 7. The locking assembly may include multiple bolts and nuts.

[0104] In one specific embodiment, the guide plate body includes a guide main plate 21 and a stiffener 22. The stiffener 22 is vertically fixed to the middle of the guide main plate 21. The guide main plate 21 has four main plate through holes arranged in an array. There are two back plates 7, which are respectively disposed on both sides of the stiffener 22.

[0105] Step S170 above: The back plate 7 is mounted against the guide plate body, and the locking components are passed through the U-shaped hole 72 and the main board through hole, and the back plate through hole 71 and the main board through hole are locked and fixed, specifically including:

[0106] Welding guide plate 21 and stiffening plate 22;

[0107] Two back plates 7 are respectively placed on both sides of the stiffener 22, and the back plates 7 are mounted against the guide plate 21 and the stiffener 22.

[0108] Adjust the position of the back plate 7 so that the U-shaped hole 72 is coaxially distributed with the through hole of the main board, and so that the through hole 71 of the back plate is coaxially distributed with the through hole of the main board and the mounting hole of the furnace leg base.

[0109] The locking components are respectively locked to the U-shaped hole 72 and the main board through hole, as well as the back plate through hole 71, the main board through hole, and the furnace leg base mounting hole.

[0110] like Figure 10 , Figure 13 , Figure 14 and Figure 15 As shown, exemplarily, the guide plate 21 and the stiffener 22 can each be a 20mm thick aluminum alloy plate, welded to form a T-shaped structure. The guide plates 21 on both sides of the stiffener 22 are each 50mm wide. Because a cooling water pipe 6 is installed on the lower side of the lower furnace leg 1, a notch is provided on the guide plate 21 corresponding to the cooling water pipe 6. Here, the thickness of the guide plate 21 is only 5mm. When the lower furnace leg 1 and the guide plate 2 are lifted upwards as a whole, the guide plate 21 breaks at the thickness junction of the notch, and the weld between the guide plate 21 and the stiffener 22 below the break is torn, causing the lower part of the guide plate 21 to detach from the main structure of the guide plate, thereby causing the lower end of the guide plate 2 to fail in positioning.

[0111] To address this, the embodiment of this application uses a 10mm thick steel plate to make the back plate 7. The back plate 7 is 50mm wide, with a φ20 through hole machined at the bottom and a 20mm wide U-shaped hole 72 machined at the top. The arc center distance between the through hole 71 and the U-shaped hole 72 is 200mm. Figure 13 As shown, on the guide plate 21, a φ20 through hole is drilled at the intersection of the center of the original lower positioning hole (220mm away) and the center line of the guide plates 21 on both sides of the stiffening plate 22, for installing the back plate. Then, bolts are simultaneously inserted into the back plate through hole 71 and the detached guide plate 21 and fixed to the furnace leg base 8, then tightened with nuts. Finally, the U-shaped hole 72 is connected and secured to the main body of the guide plate with bolts and nuts. The two back plates are installed tightly against the stiffening plate 22 and the guide plates 21 on both sides, respectively. The repaired guide plate can be reliably fixed as a whole, meeting the requirements for normal operation.

[0112] In one specific embodiment, the above steps, namely welding the guide main plate 21 and the stiffener 22, specifically include: setting multiple welded sections at intervals at the joint of the guide main plate 21 and the stiffener 22; and welding the guide main plate 21 and the stiffener 22 in the welded sections.

[0113] In this embodiment, the guide plate 21 and the stiffener 22 can each be made of aluminum alloy flat plates and combined into a T-shaped structure by intermittent welding. The guide plate 21 and the stiffener 22 are welded in an intermittent manner, which can disperse the welding heat while ensuring the connection strength between the two, avoid deformation (such as warping or shrinkage) caused by local overheating, maintain the flatness and dimensional stability of the guide plate 21 and the stiffener 22, and the intermittent welding can avoid the risk of deformation or weld cracking caused by thermal stress under the high temperature conditions of the electroslag furnace.

[0114] Optionally, an unwelded discontinuity is formed between adjacent welded sections. The ratio of the length of the welded section to the length of the discontinuity ranges from 1:2 to 1:10, and can be adjusted according to specific needs. For example, a 1:2 ratio is suitable for applications requiring higher connection strength, where the discontinuity is smaller but still relieves stress. A 1:10 ratio is suitable for deformation-sensitive or low-load scenarios. This range of weld length ratios provides flexibility, allowing for control of deformation while meeting structural strength requirements.

[0115] The above provides a detailed description of the repair method for the electroslag furnace with maintained atmosphere provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A method for repairing an electroslag furnace while maintaining an atmosphere, characterized in that, The repair method is applied to the repair of the fracture of the connection structure between the lower furnace leg (1) and the furnace leg base (8) of the electroslag furnace. The connection structure includes a threaded hole opened at the bottom of the lower furnace leg (1), a transition head (3), a connector (4), and a self-damaging locking member (5). At least a portion of the transition head (3) is provided with an external thread, which is used to make clearance fit with the threaded hole. An adhesive accommodating gap is formed between the threaded hole and the transition head (3). The connector (4) is used to connect the furnace leg base (8) and the transition head (3). The self-damaging locking member (5) is provided with a crack inlet (51) for locking the connector (4) and the furnace leg base (8). The repair method includes: A crack inlet (51) is machined on the self-damaging locking member (5); Insert the external thread of the transition head (3) into the threaded hole of the lower furnace leg (1); The adhesive is filled into the adhesive accommodating gap and cured to form a solidified layer; The lower furnace leg (1) and the transition head (3) are bonded and cured to form an integral assembly on the furnace leg base (8). The connecting piece is connected to the transition head (3). A self-damaging locking piece (5) is installed on the connecting piece, and the transition head (3) and the furnace leg base (8) are locked by the self-damaging locking piece (5).

2. The method for repairing an electroslag furnace with maintained atmosphere according to claim 1, characterized in that, The repair method is also applied to the repair of the fracture of the guide plate (2) of the electroslag furnace. The guide plate (2) includes a guide plate body, a back plate (7) that fits against the guide plate body, and a connecting component that connects the back plate (7) and the guide plate body. The upper part of the back plate (7) is provided with a U-shaped hole (72). The repair method for the guide plate includes: A U-shaped hole (72) is machined in the middle of the upper edge of the back plate (7), and a back plate through hole (71) is machined in the lower part of the U-shaped hole (72). Main board through holes are machined on the guide plate body at positions corresponding to the U-shaped hole (72) and the back plate through hole (71), respectively; The back plate (7) is mounted against the guide plate body, and the locking components are respectively passed through the U-shaped hole (72) and the main board through hole, and the back plate through hole (71) and the main board through hole are locked and fixed.

3. The method for repairing an electroslag furnace with maintained atmosphere according to claim 1, characterized in that, The transition head (3) includes a transition head body (31) and a connecting part (32), wherein the connecting part (32) includes a threaded connecting part (321) and a cylindrical connecting part (322), the cylindrical connecting part (322) is fixed to the transition head body (31), the threaded connecting part (321) is disposed on the front end face of the cylindrical connecting part (322) near the side of the lower furnace leg (1), and the threaded connecting part (321) is provided with external threads; The process of inserting the external thread of the transition head (3) into the threaded hole of the lower furnace leg (1) includes: The lower part of the threaded connection sub-part (321) of the connection part (32) is ground into a cylindrical connection sub-part (322) of a predetermined length. Clean the impurities adhering to the surfaces of the threaded connection sub-part (321) and the cylindrical connection sub-part (322); The transition head (3) is radially adjusted so that the coaxiality deviation between the transition head (3) and the lower furnace leg (1) is less than 0.2 mm; The threaded connecting part (321) and the cylindrical connecting part (322) are inserted into the threaded hole of the lower furnace leg (1), and the bottom surface of the lower furnace leg (1) is made to fit against the front end surface of the transition head body (31).

4. The method for repairing an electroslag furnace with maintained atmosphere according to claim 2, characterized in that, The adhesive includes epoxy resin and a curing agent; The process of filling the adhesive cavity with adhesive and curing it to form a solidified layer includes: Mix the epoxy resin and curing agent evenly according to the preset ratio; The well-mixed adhesive is poured into the adhesive receiving gap.

5. The method for repairing an electroslag furnace with maintained atmosphere according to claim 2, characterized in that, The guide plate body includes a guide main plate (21) and a stiffener plate (22). The stiffener plate (22) is vertically fixed to the middle of the guide main plate (21). The guide main plate (21) has four main plate through holes arranged in an array. There are two back plates (7), which are respectively located on both sides of the stiffener plate (22). The step of mounting the back plate (7) against the guide plate body, and locking the locking components through the U-shaped hole (72) and the main board through hole, and locking the back plate through hole (71) to the main board through hole, includes: Weld the guide plate (21) to the stiffener plate (22); The two back plates (7) are respectively disposed on both sides of the stiffener (22), and the back plates (7) are mounted against the guide plate (21) and the stiffener (22). Adjust the position of the back plate (7) so that the U-shaped hole (72) is coaxially distributed with the through hole of the main board, and so that the through hole (71) of the back plate is coaxially distributed with the through hole of the main board and the mounting hole of the furnace leg base; The locking components are respectively locked to the U-shaped hole (72) and the main board through hole, as well as the back plate through hole (71) and the main board through hole and the mounting hole of the furnace leg base (8).

6. The method for repairing an electroslag furnace with maintained atmosphere according to any one of claims 1 to 5, characterized in that, The crack inlet (51) is a rectangular crack inlet, the width of the crack inlet (51) is in the range of 0.5mm to 2mm, and the depth of the crack inlet (51) is in the range of 5mm to 10mm.

7. The method for repairing an electroslag furnace with maintained atmosphere according to claim 6, characterized in that, The self-damaging locking component (5) is a self-damaging locking component made of phenolic resin.

8. The method for repairing an electroslag furnace with maintained atmosphere according to claim 3, characterized in that, The threaded connection sub-part (321) and the cylindrical connection sub-part (322) are of equal length.

9. The method for repairing an electroslag furnace with maintained atmosphere according to claim 5, characterized in that, The welding of the guide plate (21) and the stiffener (22) includes: Multiple welded sections are provided at intervals at the joint between the guide plate (21) and the stiffener (22); The guide main plate (21) and the stiffening plate (22) are welded in the welding section area.

10. The method for repairing an electroslag furnace with maintained atmosphere according to claim 9, characterized in that, An unwelded discontinuity is formed between adjacent welded sections, and the ratio of the length of the welded section to the length of the discontinuity ranges from 1:2 to 1:10.

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