Method for assembling electrode column of double-shaft furnace and special platform thereof

Abstract

This invention relates to a method for assembling electrode columns in a dual-shaft electric furnace. First, a hydraulic cylinder is vertically fixed. Then, an electrode guide rod is vertically lifted and moved onto the hydraulic cylinder, aligning the assembly hole of the electrode guide rod with the hydraulic cylinder coaxially. Next, the electrode guide rod is slowly lowered until the hydraulic cylinder is fully inserted into it. This invention also provides a dedicated platform for the assembly of the electrode columns in the dual-shaft electric furnace. A support bracket and an adjustment bracket are installed on the column. The support bracket supports and fixes the hydraulic cylinder, while the adjustment bracket adjusts the verticality of the hydraulic cylinder. This invention easily maintains structural balance during assembly, minimizing horizontal shear force between the hydraulic cylinder and the electrode guide rod, and preventing damage to the high-pressure oil pipes and internal structures.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment installation engineering technology, specifically relating to a method for assembling electrode columns of a dual-shaft electric furnace and its dedicated platform. Background Technology

[0002] The electrode column is one of the main pieces of equipment in an electric furnace. Its primary function is to raise and lower the electrodes via the extension and retraction of a hydraulic cylinder. The double-shaft electrode column mainly consists of an electrode guide rod and a hydraulic cylinder. The electrode guide rod is T-shaped and welded from steel plates into a box-like structure. A circular mounting hole with a diameter of φ370mm is provided at the bottom for connection to the hydraulic cylinder. The electrode guide rod has a cross-sectional dimension of 1000×500mm and a total length of approximately 13000mm. The hydraulic cylinder liner has a diameter of approximately φ360mm and a length of 8000mm, and hydraulic oil pipes are installed on the cylinder liner.

[0003] Electrode guide rods and hydraulic cylinders are typically manufactured by different companies, therefore assembly is required after the components arrive at the installation site. The electrode guide rod has a mounting hole diameter of φ370mm, and the hydraulic cylinder is 8000mm long with a diameter of φ360mm. The φ360mm hydraulic cylinder must be installed into the φ370mm electrode guide rod.

[0004] Current technology involves first horizontally fixing the electrode guide rod, then horizontally hoisting the hydraulic cylinder and slowly pushing the 8000mm long cylinder body into the electrode guide rod. The hydraulic cylinder surface is equipped with high-pressure oil pipes, which are thin and fragile, making them highly susceptible to damage from impacts or pressure. Therefore, throughout the installation process, the hydraulic cylinder needs to maintain at least two points of support to ensure a proper clearance between the hydraulic cylinder and the electrode guide rod. If the hydraulic cylinder tilts, the collision with the inner wall of the electrode guide rod can cause scratches on the cylinder wall or, in severe cases, break the high-pressure oil pipes, rendering the hydraulic cylinder unusable. Repairing such damage not only requires significant time but also results in substantial economic losses. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing hydraulic cylinder assembly method cannot guarantee the balanced and parallel assembly of the hydraulic cylinder and the electrode guide rod, and the components are easily damaged during the installation process.

[0006] To solve the above problems, this invention provides a method for assembling electrode columns in a dual-shaft electric furnace, with the following construction steps:

[0007] The first step is to fix a support bracket 1200mm above the ground on the platform column that is fixed to the steel structure of the electric furnace platform, and install an adjustment bracket 2000mm above the support bracket.

[0008] The second step is to fix the hydraulic cylinder assembly flange to the head of the hydraulic cylinder. The hydraulic cylinder assembly flange is fitted onto the hydraulic cylinder body and fixed by the hydraulic cylinder cover; then fix the hydraulic cylinder rod to the hydraulic cylinder cover.

[0009] The third step is to use lifting equipment and hoisting locks to hoist the hydraulic cylinder vertically onto the support bracket with the head down and the bottom up, with the cylinder body set inside the opening of the adjustment bracket.

[0010] Fourth step, fix the hydraulic cylinder to the support bracket; adjust the set screws on the support bracket to ensure the hydraulic cylinder is vertical;

[0011] Fifth step: Install a lifting plate on the cross arm of the electrode guide rod, and use lifting equipment to vertically lift the electrode guide rod;

[0012] Step 6: Hoist the electrode guide rod to the top of the hydraulic cylinder, making the mounting hole at the bottom of the electrode guide rod concentric with the hydraulic cylinder, and slowly lower the hook of the lifting equipment to allow the hydraulic cylinder to insert the electrode guide rod.

[0013] Step 7: When the electrode guide rod descends to near the adjustment bracket, remove the adjustment bracket. When it descends to near the support bracket, remove the first screw. Finally, the lower end of the electrode guide rod falls onto the hydraulic cylinder assembly flange, and the hydraulic cylinder is fully inserted into the electrode guide rod.

[0014] Step 8: The electrode guide rod is fixedly connected to the hydraulic cylinder by the second screw, and the electrode guide rod and hydraulic cylinder are hoisted away from the support bracket as a whole.

[0015] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0016] This method assembles the hydraulic cylinder and electrode guide rod in a vertical position, which makes it easier to maintain the alignment of the central axis during assembly compared to the horizontal assembly in the prior art. The vertical installation makes it easier to control the gravity balance, and the shear force caused by gravity imbalance is small. Even if the components are offset, the pressure on the high-pressure oil pipe is much less than that of the horizontal installation, and it is less likely to cause destructive damage to the internal structure of the cylinder and guide rod as well as the high-pressure oil pipe.

[0017] As a preferred embodiment, a further technical solution to the above assembly method is:

[0018] In step 2 above, the hydraulic cylinder rod is fixed by a clamping plate. The clamping plate has a clamping hole in the center that matches the cross section of the hydraulic cylinder rod. The clamping hole is fitted onto the lower end of the hydraulic cylinder rod. Bolt holes are provided next to the clamping hole. The clamping plate is fixedly connected to the pressure cap by a third screw.

[0019] After the hydraulic cylinder is hoisted onto the support bracket, the hydraulic cylinder assembly flange is placed on the support bracket. The hydraulic cylinder assembly flange and the support bracket are fixedly connected by the first screw. There are four first screws, which are respectively set at the four flange holes of the hydraulic cylinder assembly flange at equal intervals.

[0020] At least three set screws are evenly spaced around the hydraulic cylinder, and the length of each set screw is adjusted to support the hydraulic cylinder from the side.

[0021] The second screw and the first screw are positioned at intervals.

[0022] The present invention also provides an assembly platform specifically for the above assembly method, the specific technical solution of which is as follows:

[0023] A special platform for assembling electrode columns of a double-shaft electric furnace includes platform columns fixed to the steel structure of the electric furnace platform. A support bracket is provided at the lower part of the platform column, and an adjustment bracket connected to the platform column is provided above the support bracket. The support bracket includes a support base plate with a fixing hole at its center and four fixing bolt holes around its outer periphery. These fixing bolt holes are aligned with the flange holes of the hydraulic cylinder assembly flange. An assembly notch is also provided around the fixing hole, spaced apart from the fixing bolt holes, exposing the flange holes of the hydraulic cylinder assembly flange. The adjustment bracket includes a U-shaped support plate with several set screws symmetrically arranged around the center of the hydraulic cylinder along the edge of the U-shaped opening. The hydraulic cylinder is vertically positioned with its head facing downwards and its bottom facing upwards. Its head is fixedly connected to the support base plate, and the cylinder body is positioned within the opening of the U-shaped support plate. The set screws support the outside of the hydraulic cylinder.

[0024] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0025] This structure keeps the hydraulic cylinder vertically fixed during the electrode guide rod assembly process, laying the foundation for vertical assembly of the hydraulic cylinder and the electrode guide rod.

[0026] As a preferred option, a further technical solution for the aforementioned assembly platform is:

[0027] The support base plate is cantilevered and fixed to one side of the platform column by horizontal and diagonal supports, and the U-shaped support plate is cantilevered to one side of the platform column by horizontal support rods, which are horizontally slidably connected to the platform column.

[0028] The set screw consists of a fixed block, an adjusting bolt, and a lock nut. The fixed block is fixedly connected to the U-shaped support plate. The adjusting bolt is threaded into the fixed block, and each adjusting bolt is arranged radially with reference to the hydraulic cylinder. The lock nut is installed on the adjusting bolt. Attached Figure Description

[0029] Figure 1 A schematic diagram of the hydraulic cylinder bracket installation;

[0030] Figure 2This is a schematic diagram of a hydraulic cylinder support bracket;

[0031] Figure 3 Schematic diagram of hydraulic cylinder adjustment bracket;

[0032] Figure 4 Diagram of the set screw structure;

[0033] Figure 5 A schematic diagram of the hydraulic cylinder fixing;

[0034] Figure 6 This is a structural diagram of the hydraulic cylinder head;

[0035] Figure 7 This is a head-fixing structure for the hydraulic cylinder when it is on the support bracket;

[0036] Figure 8 A schematic diagram of the clamping plate structure for fixing the hydraulic cylinder rod;

[0037] Figure 9 A schematic diagram illustrating the construction steps for hoisting the electrode guide rod to the upper part of the hydraulic cylinder;

[0038] Figure 10 A schematic diagram of the assembly of the electrode guide rod and the hydraulic cylinder;

[0039] Figure 11 This is a schematic diagram of the electrode guide rod suspension plate structure;

[0040] Figure 12 This is a reference diagram showing the arrangement of fixing bolt holes and assembly notches from an upward perspective.

[0041] Figure 13 This is a schematic diagram showing the assembly and fixing of the electrode guide rod and the hydraulic cylinder flange.

[0042] In the diagram: 1. Platform column; 2. Support bracket; 2-1. Support base plate; 2-2. Horizontal support; 2-3. Diagonal support; 2-4. Fixing bolt hole; 2-5. Assembly notch; 3. Adjusting bracket; 3-1. U-shaped support plate; 3-2. Horizontal support rod; 3-3. Set screw; 3-3-1. Adjusting bolt; 3-3-2. Fixing block; 3-3-3. Lock nut; 4. Hydraulic cylinder; 5. Cylinder rod; 6. Lifting equipment; 7. High-pressure oil pipe; 8. Hydraulic cylinder assembly flange; 9. Pressure cap; 10. Clamping plate; 11. Third screw; 12. First screw; 13. Lifting plate; 14. Electrode guide rod; 15. Second screw. Detailed Implementation

[0043] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0044] See Figures 1 to 13The assembly method for electrode columns of a dual-shaft electric furnace provided by this invention includes the following construction steps:

[0045] The first step is to weld a support bracket 2 for support and an adjustment bracket 3 for adjusting verticality onto the platform column 1, which is fixed to the steel structure of the electric furnace platform.

[0046] The second step involves securing the hydraulic cylinder 4 mounting flange 8 to the head of the hydraulic cylinder 4. This flange 8 is fitted onto the cylinder body of the hydraulic cylinder 4 and fixed with the hydraulic cylinder 4 cover 9. The cylinder rod 5 of the hydraulic cylinder 4 is then fixed to the cover 9 to prevent it from falling out when the hydraulic cylinder 4 is inverted. Specifically, a locking plate 10 is used to hold the cylinder rod 5 in place. Figure 6 , Figure 7 As shown, the clamping plate 10 is made of steel plate with a thickness of 16mm. The steel plate has a hole in the center, which is a clamping hole that matches the end section of the cylinder rod 5 of the hydraulic cylinder 4. Two bolt holes are provided on both sides of the clamping hole. The clamping plate 10 is fixedly connected to the pressure cover 9 of the hydraulic cylinder 4 by the third screw 11.

[0047] The third step is to use the lifting equipment 6 and the hoisting lock to hoist the hydraulic cylinder 4 vertically onto the support bracket 2 with the head down and the bottom up. The cylinder body of the hydraulic cylinder 4 is set in the opening of the adjusting bracket 3.

[0048] Fourth, use the first screw 12 to fix the hydraulic cylinder 4 to the support bracket 2, and use the set screw 3-3 to adjust the hydraulic cylinder 4 to a vertical position. After the hydraulic cylinder 4 is hoisted onto the support bracket 2, the hydraulic cylinder 4 mounting flange 8 rests on the support bracket 2. The support bracket 2 is provided with several fixing bolt holes 2-4 corresponding to the flange holes. The first screw 12 is used to fix the hydraulic cylinder 4 to the support bracket 2. Specifically, there are four fixing bolt holes 2-4, and four first screws 12 are evenly installed on the flange.

[0049] Fifth, use lifting equipment 6 and lifting tools to vertically lift the electrode guide rod 14, ensuring it is in a vertical position. When lifting the electrode guide rod 14, use the following methods: Figures 9 to 11 The hanging plate 13 shown is made of steel plate with a thickness of 20mm. A square hole is opened in the center of the steel plate, and the size of the square hole is adapted to the cross arm of the electrode guide rod 14.

[0050] Step 6: Hoist the electrode guide rod 14 directly above the hydraulic cylinder 4, so that the mounting hole at the bottom of the electrode guide rod 14 is concentric with the hydraulic cylinder 4; slowly lower the hook of the lifting equipment 6 so that the hydraulic cylinder 4 can be inserted into the electrode guide rod 14.

[0051] Step 7: When the electrode guide rod 14 descends to near the adjustment bracket 3, remove the adjustment bracket 3; when it descends to near the support bracket 2, remove the first screw 12; the electrode guide rod 14 descends until the hydraulic cylinder 4 is fully inserted into the electrode guide rod 14.

[0052] Step 8: Fix the electrode guide rod 14 to the hydraulic cylinder 4, and then hoist the electrode guide rod 14 and the hydraulic cylinder 4 as a whole away from the support bracket 2. After the hydraulic cylinder 4 is fully inserted into the electrode guide rod 14, the bottom of the electrode guide rod 14 and the mounting flange 8 of the hydraulic cylinder 4 are fixed together by the second screw 15, and then the whole assembly is hoisted away.

[0053] The assembly of the aforementioned hydraulic cylinder 4 and electrode guide rod 14 is carried out on an assembly platform. The structure of the assembly platform used in the above method is described in detail below:

[0054] like Figure 1 The present invention provides a special platform for assembling electrode columns of a dual-shaft electric furnace, including a platform column 1 fixed to the construction surface, and a support bracket 2 and an adjustment bracket 3 provided on the platform column 1.

[0055] For details, see Figure 2 , Figure 7 , Figure 12 , Figure 13 The support bracket 2 includes a support base plate 2-1, a horizontal support 2-2 (channel steel), an inclined support 2-3 (channel steel), and a connecting channel steel. The channel steel is of type

[20] . The support base plate 2-1 is a steel plate with a thickness of 20mm. A fixing hole is provided on the support base plate 2-1, and four fixing bolt holes 2-4 are evenly distributed around the outer periphery of the fixing hole. The size of the fixing bolt holes 2-4 is the same as the flange hole of the hydraulic cylinder 4 mounting flange 8. After the hydraulic cylinder 4 mounting flange 8 is placed on the support bracket 2, the hydraulic cylinder 4 cylinder rod 5 extends under the fixing hole, and part of the flange hole of the hydraulic cylinder 4 mounting flange 8 is aligned with the fixing bolt holes 2-4. There are also four mounting notches 2-5 around the fixing hole. The mounting notches 2-5 are spaced apart from the fixing bolt holes 2-4. The mounting notches 2-5 correspond to part of the flange holes. The structure of the mounting notches 2-5 prevents the second screw 15 from being obstructed by the steel plate when connecting the electrode guide rod 14 and the hydraulic cylinder 4.

[0056] For details, see Figure 3 , Figure 4 and Figure 5The adjusting bracket 3 includes a steel plate, which is a U-shaped support plate 3-1; it also includes a horizontal support rod 3-2 for supporting the U-shaped support plate 3-1, which can be made of channel steel; and a set screw 3-3 consisting of a fixing block 3-3-2, a lock nut 3-3-3, and an adjusting bolt 3-3-1. The channel steel is of type [14, and the steel plate thickness is 10mm. A U-shaped opening is cut on the steel plate, which is 10mm larger than the outer diameter of the hydraulic cylinder 4. The set screw 3-3 is located at the edge of the opening, and at least 3 sets are symmetrically arranged with the central axis of the hydraulic cylinder 4 as the center. The lock nut 3-3-3 and the adjusting bolt 3-3-1 are M20, and the length of the adjusting bolt 3-3-1 is 130mm. The fixing block 3-3-2 is fixedly connected to the U-shaped support plate 3-1. The adjusting bolts 3-3-1 are threaded into the fixing block 3-3-2. The adjusting bolts 3-3-1 are arranged radially. The lock nut 3-3-3 is installed on the adjusting bolts 3-3-1 to lock the extension length of the adjusting bolts 3-3-1 towards the hydraulic cylinder 4. The hydraulic cylinder is supported in multiple directions by multiple set screws to correct the verticality of the hydraulic cylinder.

[0057] Furthermore, the adjustment bracket 3 and the platform column 1 are connected by a horizontal sliding structure. Specifically, a slide rail is installed between the horizontal support rod 3-2 and the column to allow the adjustment bracket to extend and retract. With this structure, when the electrode guide rod descends close to the adjustment bracket, it is prevented from continuing to descend due to obstruction by the bracket. The adjustment bracket is then retracted back towards the platform column 1. After the assembled electrode guide rod is removed from the platform, the adjustment bracket is extended again. This structure makes the removal and repositioning of the adjustment bracket more convenient.

[0058] The top surface of support bracket 2 is 1200mm from the ground, and the distance between the adjusting bracket and support bracket 2 is 22000mm.

[0059] The hydraulic cylinder 4 and the electrode guide rod of this invention are assembled vertically, which results in a large longitudinal force and a small lateral force, making it easy to align the central axis. The lateral width is small during installation, which greatly reduces the lateral shear force when the component is offset, thereby reducing the impact force and the risk of the high-pressure oil pipe 7 being damaged by shear force.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A method for assembling electrode columns in a dual-shaft electric furnace, characterized in that: The construction steps are as follows: The first step is to fix a support bracket (2) 1200mm from the ground on the platform column (1) which is fixed to the steel structure of the electric furnace platform, and install an adjustment bracket (3) 2000mm above the support bracket (2); The second step is to fix the hydraulic cylinder (4) assembly flange (8) to the head of the hydraulic cylinder (4). The hydraulic cylinder (4) assembly flange (8) is fitted onto the cylinder body of the hydraulic cylinder (4) and fixed by the hydraulic cylinder (4) cover (9). The hydraulic cylinder (4) rod (5) is fixed to the hydraulic cylinder (4) cover (9). The hydraulic cylinder (4) rod (5) is fixed by a clamping plate (10). The clamping plate (10) has a clamping hole in the center that matches the cross section of the hydraulic cylinder (4) rod (5). The clamping hole is fitted onto the lower end of the hydraulic cylinder (4) rod (5). Bolt holes are provided next to the clamping hole. The clamping plate (10) is fixedly connected to the cover (9) by a third screw (11). The third step is to use the lifting equipment (6) and the hoisting lock to hoist the hydraulic cylinder (4) vertically onto the support bracket (2) with the head down and the bottom up. The cylinder body of the hydraulic cylinder (4) is set in the opening of the adjustment bracket (3). After the hydraulic cylinder (4) is hoisted onto the support bracket (2), the hydraulic cylinder (4) mounting flange (8) is placed on the support bracket (2). The hydraulic cylinder (4) mounting flange (8) and the support bracket (2) are fixedly connected by the first screw (12). The first screw (12) has four screws, which are respectively set at the four flange holes of the hydraulic cylinder (4) mounting flange (8) at equal intervals. Fourth step, fix the hydraulic cylinder (4) to the support bracket (2); adjust the set screw (3-3) on the adjustment bracket (3) to ensure that the hydraulic cylinder (4) is vertical; Fifth step, install a lifting plate (13) on the cross arm of the electrode guide rod (14) and use the lifting equipment (6) to vertically lift the electrode guide rod (14); Step 6: Hoist the electrode guide rod (14) directly above the hydraulic cylinder (4) so ​​that the mounting hole at the bottom of the electrode guide rod (14) is concentric with the hydraulic cylinder (4), and slowly lower the hook of the lifting equipment (6) so that the hydraulic cylinder (4) inserts into the electrode guide rod (14). Step 7: When the electrode guide rod (14) descends close to the adjustment bracket (3), the adjustment bracket (3) is removed. When it descends close to the support bracket (2), the first screw (12) is removed. Finally, the lower end of the electrode guide rod (14) falls onto the mounting flange (8) of the hydraulic cylinder (4), and the hydraulic cylinder (4) is fully inserted into the electrode guide rod (14). The second screw (15) is positioned at intervals from the first screw (12). In the eighth step, the electrode guide rod (14) is fixedly connected to the hydraulic cylinder (4) by the second screw (15), and the electrode guide rod (14) and the hydraulic cylinder (4) are hoisted away from the support bracket (2) as a whole.

2. The method for assembling electrode columns of a dual-shaft electric furnace according to claim 1, characterized in that: At least three set screws (3-3) are evenly spaced around the hydraulic cylinder (4), and the length of each set screw (3-3) is adjusted to support the hydraulic cylinder (4) from the side.

3. A dedicated platform for the electrode column assembly method of the dual-shaft electric furnace as described in claim 1 or 2, characterized in that: The system includes a platform column (1) fixed to the steel structure of the electric furnace platform, a support bracket (2) at the bottom of the platform column (1), and an adjustment bracket (3) connected to the platform column (1) at the top of the support bracket (2). The support bracket (2) includes a support base plate (2-1), a fixing hole at the center of the support base plate (2-1), and four fixing bolt holes (2-4) around the fixing hole. The fixing bolt holes (2-4) are aligned with the flange holes of the mounting flange (8) of the hydraulic cylinder (4). The fixing hole is also provided with an assembly notch (2-5) spaced apart from the fixing bolt holes (2-4). The assembly notch (2-5) exposes the hydraulic cylinder. (4) Flange holes for assembly flange (8); Adjustment bracket (3) includes U-shaped support plate (3-1), and its U-shaped opening edge is provided with several set screws (3-3) symmetrically arranged around the center of hydraulic cylinder (4); Set screw (3-3) consists of fixed block (3-3-2), adjusting bolt (3-3-1) and lock nut (3-3-3), the fixed block (3-3-2) is fixedly connected to U-shaped support plate (3-1); Adjusting bolt (3-3-1) is threaded in fixed block (3-3-2), and each adjusting bolt (3-3-1) is arranged radially with reference to hydraulic cylinder (4); Lock nut (3-3-3) is installed on adjusting bolt (3-3-1); The hydraulic cylinder (4) is vertically set with its head facing down and its bottom facing up. Its head is fixedly connected to the support plate (2-1). The cylinder body is set in the opening of the U-shaped support plate (3-1). The set screw (3-3) is supported on the outside of the hydraulic cylinder (4). The support plate (2-1) is cantilevered and fixed to one side of the platform column (1) by the horizontal support (2-2) and the diagonal support (2-3). The U-shaped support plate (3-1) is cantilevered to one side of the platform column (1) by the horizontal support rod (3-2). The horizontal support rod (3-2) is horizontally slidably connected to the platform column (1).

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