Device and method for replacing wear-resistant bushing in blast furnace top

Abstract

The invention discloses a blast furnace top internal wear-resistant bushing replacing device and method. The blast furnace top internal wear-resistant bushing replacing device comprises a connecting seat, a connecting hole is formed in the connecting seat and connected with external hoisting equipment, connecting beams are symmetrically arranged on the periphery of the connecting seat, lifting hooks are arranged at the bottoms of the outer ends of the beams, and each lifting hook is composed of a lifting arm and an outer side hook head which are flexibly connected and connected with an adjusting mechanism composed of a pull rope and a main rope; an anti-skid layer is arranged on the inner side of the hook head, and a wear-resistant layer is arranged on the inner wall of the guide pipe. According to the invention, secondary damping down and shutdown caused by sealing treatment by dismounting the compensator can be avoided, the maintenance time is shortened, the production cost is reduced, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wear-resistant liners inside the blast furnace top, and specifically to a device and method for replacing the wear-resistant liners inside the blast furnace top. Background Art

[0002] The upper and lower parts of the blast furnace top equipment are basically connected by flange bolts. The flange contact surface is a rigid plane connection, and the seal uses a stainless steel-clad gasket. To enhance the sealing effect, high-temperature white thick paint needs to be applied to the sealing contact part. During the next construction, polishing and grinding must be carried out with a grinding tool. Therefore, it takes a relatively long time to replace the wear-resistant liners inside the compensators in these parts. After the blast furnace is shut down, the bolts of the compensator are removed, the compensator is hoisted out, the internal wear-resistant liner is removed, the wear-resistant liner is reinstalled, the compensator is reinstalled, the gasket is coated with thick paint, the gasket is reinstalled, the bolts are centered and inserted, the bolts are tightened multiple times, leak detection is carried out, and the bolts are tightened again.

[0003] This method has the problems of relatively long time consumption, which takes 5 - 6 hours, many construction links, and possible leakage of gas from the flange sealing surface after construction. There has also been a situation where even after tightening the bolts multiple times, effective sealing cannot be achieved, resulting in the need to replace the gasket at the leakage part again during the second shutdown of the blast furnace, which poses certain potential construction quality hazards and brings passivity to production. The upper and lower parts of the blast furnace top equipment are basically connected by flange bolts. The flange contact surface is a rigid plane connection, and the seal uses a stainless steel-clad gasket. To enhance the sealing effect, high-temperature white thick paint needs to be applied to the sealing contact part. During the next construction, polishing and grinding must be carried out with a grinding tool. Therefore, it takes a relatively long time to replace the wear-resistant liners inside the compensators in these parts. After the blast furnace is shut down, the bolts of the compensator are removed, the compensator is hoisted out, the internal wear-resistant liner is removed, the wear-resistant liner is reinstalled, the compensator is reinstalled, the gasket is coated with thick paint, the gasket is reinstalled, the bolts are centered and inserted, the bolts are tightened multiple times, and leak detection and re-tightening are carried out after the furnace is restarted.

[0004] This method has the problems of relatively long time consumption, which takes 5 - 6 hours, many construction links, and possible leakage of gas from the flange sealing surface after construction. There has also been a situation where even after tightening the bolts multiple times, effective sealing cannot be achieved, resulting in the need to replace the gasket at the leakage part again during the second shutdown of the blast furnace, which poses certain potential construction quality hazards and brings passivity to production. To solve the above problems, a device and method for replacing the wear-resistant liners inside the blast furnace top are now proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a device and method for replacing the wear-resistant liners inside the blast furnace top.

[0006] The specific solution of the present invention is as follows: A wear-resistant bushing replacement device inside the blast furnace top, comprising: a connection seat, on which a connection hole is provided for connecting with an external hoisting device; symmetrically arranged connection beams around the connection seat, the connection beams are fixedly connected to the connection seat, and a hook is provided at the bottom of the outer end of the connection beam. The hook includes: a hook head and a lifting arm, the upper end of the lifting arm is flexibly connected to the corresponding connection beam, and the hook head faces outward; an adjusting mechanism is connected to the hook, and the adjusting mechanism includes: a pulling rope corresponding to the hook, one end of the pulling rope is connected to the middle of the corresponding hook, and the other end is connected to a main rope.

[0007] Further, a guiding tube is provided on the connection seat, the guiding tube is vertically fixed on the connection seat, and the main rope passes through the guiding tube.

[0008] Further, the lifting arm and the outer end of the connection beam are flexibly connected by a chain.

[0009] Further, an anti-slip layer is provided inside the hook head, the anti-slip layer is made of rubber or silica gel material, and serrated protrusions are provided on the surface to increase the friction with the wear-resistant bushing and prevent the wear-resistant bushing from slipping during hoisting.

[0010] Further, a wear-resistant layer is provided on the inner wall of the guiding tube, and the wear-resistant layer is made of tungsten carbide or ceramic material.

[0011] Further, a level is also provided on the connection seat, and the level is used to detect the horizontal state of the connection seat to ensure the stable hoisting of the wear-resistant bushing during hoisting. A method for replacing the wear-resistant bushing inside the blast furnace top, applicable to the above-mentioned wear-resistant bushing replacement device inside the blast furnace top, includes the following steps: Step 1: Open the lower seal valve inspection door, connect the connection seat with the chain hoist, and place this device into the lower seal inspection door. Step 2: Control the descent of this device through the chain hoist, and at the same time tighten the main rope to make the hook retract inward. When the hook descends to the bottom of the wear-resistant bushing, loosen the main rope, the hook hangs on the bottom of the wear-resistant bushing, and lift the wear-resistant bushing to the lower seal valve inspection door by the chain hoist and take it out. Step 3: Hang the hook on the new wear-resistant bushing again, send it into the lower seal inspection door, place the new wear-resistant bushing at the set position by the chain hoist, and tighten the main rope, thereby loosening the hook to complete the replacement of the wear-resistant bushing.

[0012] The present invention has the following beneficial effects: 1. Eliminate the possible leakage caused by disassembling and assembling the compensator to handle the seal, and avoid the secondary blast furnace shutdown accident for treatment. 2. Shorten the maintenance time, which is beneficial for the blast furnace to resume blowing earlier and restore the furnace condition, save the coke ratio and fuel ratio of the blast furnace, and reduce the production cost pressure brought by maintenance. 3. Reduce the labor intensity of maintenance operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the top equipment of a blast furnace; In the figure: 1. Replacement device; 101. Connecting seat; 102. Connecting hole; 103. Connecting beam; 104. Chain; 105. Hook; 1051. Boom; 1052. Hook head; 106. Pulling rope; 107. Main rope; 2. Top of the blast furnace; 201. Bunker; 202. Lower sealing valve; 203. Inspection door; 204. Discharge hopper; 205. Platform; 206. Wear-resistant bushing; 207. Upper flange; 208. Lower flange; 209. Gearbox; 210. Compensator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0016] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0017] The equipment of the blast furnace top 2 includes: a bunker 201, a maintenance door 203, a lower sealing valve 202, a platform 205, an upper flange 207, a lower flange 208, a gearbox 209, a compensator 210, a wear-resistant bushing 206, and a feed hopper 204. The upper and lower parts of the equipment of the blast furnace top 2 are basically connected by flange bolts. The flange contact surface is a rigid plane connection, and the seal uses a stainless steel-coated gasket. To enhance the sealing effect, high-temperature white thick paint needs to be applied to the sealing contact part. During the next construction, polishing and grinding must be carried out with a grinding tool. Therefore, it takes a relatively long time to replace the wear-resistant bushing 206 inside the compensator 210 at these parts. After the blast furnace is shut down, remove the bolts of the compensator 210, lift out the compensator 210, remove the internal wear-resistant bushing 206, reinstall the wear-resistant bushing 206, reinstall the compensator 210, apply thick paint to the gasket, reinstall the gasket, align and insert the bolts, and tighten the bolts multiple times. Check for leaks and tighten again.

[0018] This method has the problems of relatively long time consumption, about 5 - 6 hours, many construction links, possible gas leakage from the flange sealing surface after construction, and there has also been a situation where even after tightening the bolts multiple times, effective sealing cannot be achieved, resulting in the need to replace the gasket at the leakage part again during the second shutdown of the blast furnace, which brings passivity to production due to certain construction quality hazards. The upper and lower parts of the equipment of the blast furnace top 2 are basically connected by flange bolts. The flange contact surface is a rigid plane connection, and the seal uses a stainless steel-coated gasket. To enhance the sealing effect, high-temperature white thick paint needs to be applied to the sealing contact part. During the next construction, polishing and grinding must be carried out with a grinding tool. Therefore, it takes a relatively long time to replace the wear-resistant bushing 206 inside the compensator 210 at these parts. After the blast furnace is shut down, remove the bolts of the compensator 210, lift out the compensator 210, remove the internal wear-resistant bushing 206, reinstall the wear-resistant bushing 206, reinstall the compensator 210, apply thick paint to the gasket, reinstall the gasket, align and insert the bolts, and tighten the bolts multiple times. After the blast furnace is restarted, check for leaks and tighten again.

[0019] This method has the problems of relatively long time consumption, about 5 - 6 hours, many construction links, possible gas leakage from the flange sealing surface after construction, and there has also been a situation where even after tightening the bolts multiple times, effective sealing cannot be achieved, resulting in the need to replace the gasket at the leakage part again during the second shutdown of the blast furnace, which brings passivity to production due to certain construction quality hazards. To solve the above problems, a replacement device 1 and method for the wear-resistant bushing 206 inside the blast furnace top 2 are proposed.

[0020] Please refer to Figure 1 - Figure 2, a replacement device 1 for the wear-resistant lining 206 inside the blast furnace top 2, comprising: a connection seat 101, on which a connection hole 102 is provided for connecting with an external hoisting device; symmetrically arranged connection beams 103 around the connection seat 101, the connection beams 103 being fixedly connected to the connection seat 101, and a hook 105 being provided at the bottom of the outer end of the connection beam 103. The hook 105 includes: a hook head 1052 and a lifting arm 1051, the upper end of the lifting arm 1051 being flexibly connected to the corresponding connection beam 103, and the hook head 1052 facing outward; an adjusting mechanism is connected to the hook 105, and the adjusting mechanism includes: a pulling rope 106 corresponding to the hook 105, one end of the pulling rope 106 being connected to the middle of the corresponding hook 105, and the other end being connected to a main rope 107.

[0021] In this embodiment, a guiding tube is provided on the connection seat 101, the guiding tube being vertically fixed on the connection seat 101, and the main rope 107 passes through the guiding tube.

[0022] In this embodiment, the lifting arm 1051 and the outer end of the connection beam 103 are flexibly connected by a chain 104.

[0023] In this embodiment, an anti-slip layer is provided inside the hook head 1052, the anti-slip layer being made of rubber or silica gel material, and having serrated protrusions on the surface to increase the friction with the wear-resistant lining 206 and prevent the wear-resistant lining 206 from slipping during the hoisting process.

[0024] In this embodiment, a wear-resistant layer is provided on the inner wall of the guiding tube, the wear-resistant layer being made of tungsten carbide or ceramic material.

[0025] In this embodiment, a level is further provided on the connection seat 101, the level being used to detect the horizontal state of the connection seat 101 so as to ensure the stable hoisting of the wear-resistant lining 206 during the hoisting process.

[0026] A method for replacing the wear-resistant lining 206 inside the blast furnace top 2, applicable to the above-mentioned replacement device 1 for the wear-resistant lining 206 inside the blast furnace top 2, includes the following steps: Step 1: Open the maintenance door 203 of the lower sealing valve 202, connect the connection seat 101 with a chain hoist, and place this device into the lower sealing maintenance door 203. Step 2: Control the descent of this device by the chain hoist, and at the same time tighten the main rope 107 to make the hook 105 retract inward. When the hook 105 descends to the bottom of the wear-resistant lining 206, loosen the main rope 107, the hook 105 hooks the bottom of the wear-resistant lining 206, and lift the wear-resistant lining 206 to the maintenance door 203 of the lower sealing valve 202 and take it out. Step 3: Then hang the lifting hook 105 on the new wear-resistant bushing 206, send it into the lower seal maintenance door 203, place the new wear-resistant bushing 206 at the set position by means of a hoist, and tighten the main rope 107, thereby loosening the lifting hook 105 to complete the replacement of the wear-resistant bushing 206.

[0027] The present invention has the following beneficial effects: 1. Eliminate the need for disassembling and assembling the compensator 210 to handle the possible leakage during sealing, which may cause secondary blast furnace shutdown for accident handling. 2. Shorten the maintenance time, which is beneficial for the blast furnace to resume blowing earlier and restore the furnace condition, save the coke ratio and fuel ratio of the blast furnace, and reduce the production cost pressure brought by maintenance. 3. Reduce the labor intensity of maintenance operators.

Claims

1. A wear-resistant lining replacement device inside the blast furnace top, characterized in that: Comprising: A connecting seat, on which a connecting hole is provided for connecting with an external hoisting device; symmetrically arranged connecting beams are provided around the connecting seat, the connecting beams are fixedly connected to the connecting seat, and hooks are provided at the bottoms of the outer ends of the connecting beams. The hooks include: a hook head and a lifting arm, the upper end of the lifting arm is flexibly connected to the corresponding connecting beam, and the hook head faces outward; an adjusting mechanism is connected to the hook, and the adjusting mechanism includes: a pulling rope corresponding to the hook, one end of the pulling rope is connected to the middle of the corresponding hook, and the other end is connected to a main rope.

2. The replacement device for the wear-resistant lining inside the blast furnace top according to claim 1, characterized in that: A guiding tube is provided on the connecting seat, and the guiding tube is vertically fixed on the connecting seat, and the main rope passes through the guiding tube.

3. A replacement device for the wear-resistant lining inside the blast furnace top according to claim 1, characterized in that: The lifting arm and the outer end of the connecting beam are flexibly connected by a chain.

4. A replacement device for the wear-resistant lining inside the blast furnace top according to claim 2, characterized in that: An anti-slip layer is provided inside the hook head, and the anti-slip layer is made of rubber or silica gel material, and serrated protrusions are provided on the surface to increase the friction with the wear-resistant bushing and prevent the wear-resistant bushing from slipping during hoisting.

5. The replacement device for the wear-resistant lining inside the blast furnace top according to claim 2, characterized in that: A wear-resistant layer is provided on the inner wall of the guiding tube, and the wear-resistant layer is made of tungsten carbide or ceramic material.

6. The replacement device for the wear-resistant lining inside the blast furnace top according to claim 1, characterized in that: A spirit level is also provided on the connecting seat, and the spirit level is used to detect the horizontal state of the connecting seat to ensure the stable hoisting of the wear-resistant bushing during hoisting.

7. A method for replacing the wear-resistant lining inside the blast furnace top, applicable to the device described in any one of claims 1-6, characterized in that: Including the following steps: Step 1: Open the lower seal valve inspection door, connect the connecting seat with the chain hoist, and place the device into the lower seal inspection door. Step 2: Control the device to descend by the chain hoist, and at the same time tighten the main rope to make the hook retract inward. When the hook descends to the bottom of the wear-resistant bushing, loosen the main rope, the hook hangs on the bottom of the wear-resistant bushing, and lift the wear-resistant bushing to the lower seal valve inspection door by the chain hoist and take it out. Step 3: Hang the hook on a new wear-resistant bushing again, send it into the lower seal inspection door, place the new wear-resistant bushing at the set position by the chain hoist, and tighten the main rope, so as to loosen the hook and complete the replacement of the wear-resistant bushing.

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