A method for quickly maintaining the inclined flue of an electric arc furnace and a transport vehicle

Abstract

The present invention relates to a method for quickly maintaining the inclined flue of an electric arc furnace and a transport vehicle, comprising the following steps: opening an avoidance opening in the enclosure wall; configuring a transport vehicle with a lifting mechanism and a connection mechanism, opening the connection mechanism, moving the transport vehicle through the avoidance opening into the enclosure, closing the connection mechanism, raising the lifting mechanism to support the inclined flue, disconnecting the connection between the inclined flue and the electric arc furnace body, lifting the bottom end of the inclined flue out of the settling chamber by the lifting mechanism, and transporting the inclined flue out of the enclosure by the transport vehicle; moving the repaired or replaced inclined flue into the enclosure by the transport vehicle, lowering the bottom end of the inclined flue into the settling chamber by the lowering of the lifting mechanism, connecting the inclined flue to the electric arc furnace body, continuing to lower the lifting mechanism to disengage from the inclined flue, opening the connection mechanism, moving the transport vehicle out of the enclosure, and sealing the avoidance opening. The present invention avoids operations such as disassembling and reassembling the electric arc furnace body, reduces the time and cost for maintaining the inclined flue, and eliminates potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of electric arc furnace machinery, and particularly to a method for quickly maintaining the inclined flue of an electric arc furnace and a transport vehicle. Background Art

[0002] In the iron and steel smelting industry, an electric arc furnace mainly heats scrap steel to a molten state through a high-temperature electric arc to provide liquid steel for subsequent refining. In order to avoid smoke and dust overflow and reduce noise hazards during the smelting production of the electric arc furnace, according to environmental protection requirements, a large closed hood is now added in the electric arc furnace area for protection. The wall of the electric arc furnace closed hood is of concrete structure. After the closed hood is built, the dust removal and water-cooled inclined flue of the electric arc furnace passes through the concrete wall of the closed hood in an inclined shape. One end of the inclined flue is connected to the outlet of the four-hole water-cooled elbow of the electric arc furnace, and the other end is connected (inserted) into the inlet of the combustion settling chamber. The complex environment of the electric arc furnace often causes water leakage in the inclined flue, which needs to be disassembled and maintained regularly. And the inlet area of the combustion settling chamber is a high-temperature and high-risk area, so the replacement of the inclined flue is difficult.

[0003] The electric arc furnace body is located inside the inclined flue relative to the wall of the closed hood. Due to the limitation of the spatial position relationship and the inclination of the inclined flue, before replacing the inclined flue, it is necessary to remove and lift away equipment and facilities that affect the hoisting, such as the four-hole water-cooled elbow of the electric arc furnace body, the large furnace cover, the upper furnace shell of the electric arc furnace, and the electrodes, to avoid collision with the inclined flue. It is also necessary to replace the wire rope of the auxiliary hook of the 150-ton bridge crane and adjust the main hook gantry plate hook, etc. During the replacement, the auxiliary hook of the crane hoists the upper part of the inclined flue on the side of the electric arc furnace in the closed hood, and the wire rope of the auxiliary hook of the crane closely adheres to the fixed top plate of the closed hood. At the same time, two 10-ton manual chain hoists are used to pull the lower part of the inclined flue on the side of the settling chamber outside the closed hood wall (opposite side of the electric arc furnace). The crane and the manual chain hoists cooperate closely to slowly lift the old inclined flue out of the closed hood and lift the new inclined flue in; after the new inclined flue is in place and stable, the auxiliary hook of the crane is unhooked; finally, the upper furnace shell, the large furnace cover, and the four-hole water-cooled elbow of the electric arc furnace are reinstalled, and the refractory material inside the electric arc furnace is repaired, etc. to complete the replacement. Currently, the single replacement time of the inclined flue takes up to about 72 hours, and the loss caused by production stoppage is large. Due to the position of the fixed top plate of the closed hood, the wire rope of the auxiliary hook of the 150-ton bridge crane is forced to pull obliquely, posing a safety hazard.

[0004] During the production of the electric arc furnace, when there is a small amount of water leakage in the inclined flue and it does not affect safety, it usually has to be welded and repaired until the monthly furnace building overhaul. If a large amount of water leakage affects safety, it is necessary to quickly stop production for treatment. From stopping the furnace, cooling, draining water, setting up a temporary maintenance platform, welding and repairing, testing water pressure, removing the temporary maintenance platform to resuming production, it takes about 16 hours, resulting in production interruption. Therefore, the water leakage of the inclined flue often cannot be treated in time, resulting in insufficient service life of the inclined flue. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problems in the prior art that the maintenance method of the inclined flue by crane hoisting has a large working intensity, a long time consumption, and potential safety hazards in the hoisting operation. Furthermore, a method and a transport vehicle for quickly maintaining the inclined flue of an electric arc furnace are provided, which greatly reduce the time consumption, cost, and working intensity of maintaining the inclined flue, and also improve the safety of maintaining the inclined flue.

[0006] To solve the above technical problem, the present invention provides a method for quickly maintaining the inclined flue of an electric arc furnace, which further includes the following steps:

[0007] Open an avoidance opening on the closed hood wall corresponding to the inclined flue;

[0008] Configure a transport vehicle with a lifting mechanism and a connecting mechanism. Open the connecting mechanism to make the transport vehicle form an avoidance for the inclined flue in the closed hood. The transport vehicle passes through the avoidance opening and moves into the closed hood, and moves the lifting mechanism to below the inclined flue. Close the connecting mechanism to strengthen the transport vehicle. The lifting mechanism rises to support the inclined flue, disconnect the connection between the inclined flue and the electric arc furnace body, and the lifting mechanism continues to rise to lift the bottom end of the inclined flue out of the settling chamber. The transport vehicle passes through the avoidance opening and transports the inclined flue outside the closed hood;

[0009] Repair or replace the inclined flue. Use the transport vehicle to move the repaired or replaced inclined flue into the closed hood. Use the lifting mechanism to lower the bottom end of the inclined flue into the settling chamber. Connect the inclined flue to the electric arc furnace body. The lifting mechanism continues to lower until it disengages from the inclined flue. Open the connecting mechanism to make the transport vehicle form an avoidance for the assembled inclined flue. The transport vehicle moves outside the closed hood and seals the avoidance opening.

[0010] In an embodiment of the present invention, it further includes the following steps:

[0011] Configure an avoidance passage for the above transport vehicle. During the process of the transport vehicle moving to the closed hood, the transport vehicle uses the avoidance passage to avoid the inclined flue.

[0012] In an embodiment of the present invention, it further includes the following steps:

[0013] Configure the lifting mechanism in the middle of the transport vehicle and on both sides of the avoidance passage, and use the lifting mechanisms on both sides to support both sides of the inclined flue respectively.

[0014] In an embodiment of the present invention, it further includes the following steps:

[0015] Configure the avoidance passage to penetrate the transport vehicle in the vertical direction and extend from the end of the transport vehicle to the middle of the transport vehicle along the moving direction of the transport vehicle.

[0016] In an embodiment of the present invention, it further includes the following steps:

[0017] The connecting mechanism is configured to have a connected state and a disconnected state. The connecting mechanism in the connected state strengthens the transport vehicle and locks the avoidance passage, and the connecting mechanism in the disconnected state unlocks the avoidance passage.

[0018] In an embodiment of the present invention, the following steps are further included:

[0019] The connecting mechanism changes from the connected state to the disconnected state, and then the transport vehicle is moved into the closed cover.

[0020] The connecting mechanism changes from the connected state to the disconnected state, and then the transport vehicle is moved outside the closed cover.

[0021] In an embodiment of the present invention, the following steps are further included:

[0022] First, the connecting mechanism is changed from the disconnected state to the connected state, and then it is lifted by the lifting mechanism to support the inclined flue.

[0023] The lifting mechanism descends to lower the lower end of the inclined flue into the sedimentation chamber and lower the upper end of the inclined flue to align with the outlet of the four-hole water-cooled elbow.

[0024] In an embodiment of the present invention, the following steps are further included:

[0025] Walking tracks are arranged on both sides of the sedimentation chamber. The walking tracks extend from outside the closed cover through the avoidance opening into the closed cover, and the transport vehicle is supported and guided by the walking tracks.

[0026] There is also provided a transport vehicle for implementing the method for quickly maintaining the inclined flue of an electric arc furnace, including:

[0027] A vehicle body;

[0028] A plurality of lifting mechanisms, the plurality of lifting mechanisms are distributed on both sides of the vehicle body along the moving direction of the vehicle body, and each lifting mechanism includes a support member and a lifting driver for driving the support member to lift and lower.

[0029] In an embodiment of the present invention, the vehicle body is provided as a hollow frame connected by a plurality of cross beams. An avoidance passage is provided in the middle of the hollow frame. The plurality of cross beams include movable cross beams that can be disassembled or opened and closed. The movable cross beams are arranged at one end of the hollow frame along the moving direction.

[0030] In an embodiment of the present invention, the plurality of lifting mechanisms are arranged in the middle of the vehicle body, and the plurality of lifting mechanisms are distributed on both sides of the avoidance passage.

[0031] In an embodiment of the present invention, the movable crossbeam is disconnected from the middle to form a first crossbeam split body and a second crossbeam split body. The first crossbeam split body and the second crossbeam split body are respectively slidably connected to both sides of the hollow frame along their axial directions. The first crossbeam split body and the second crossbeam split body can be detachably connected at the disconnection position. When the first crossbeam split body and the second crossbeam split body move relatively away from each other along their axial directions, a gap is formed in the hollow frame to penetrate through the avoidance channel.

[0032] In an embodiment of the present invention, it further includes a plurality of telescopic drivers arranged on the hollow frame. The plurality of telescopic drivers respectively drive the first crossbeam split body and the second crossbeam split body to move reversely along their axial directions.

[0033] In an embodiment of the present invention, a clamping groove is provided on the end face of the first crossbeam split body, and a clamping portion is provided on the end face of the second crossbeam split body. When the first crossbeam split body and the second crossbeam split body move relatively close to each other along their axial directions, the clamping portion is inserted into the clamping groove.

[0034] In an embodiment of the present invention, the transport vehicle further includes a driving mechanism, and the driving mechanism drives the vehicle body to move.

[0035] In an embodiment of the present invention, both ends of the vehicle body along its moving direction are respectively set as a driving end and a non-driving end. The movable crossbeam is arranged at the non-driving end, and the driving mechanism is arranged at the driving end.

[0036] In an embodiment of the present invention, it further includes walking tracks arranged on both sides of the settling chamber. The walking tracks extend from outside the sealed cover through the avoidance opening to inside the sealed cover, and the vehicle body moves along the walking tracks.

[0037] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0038] In the method for quickly maintaining the inclined flue of the electric arc furnace of the present invention, by opening an avoidance opening on the wall of the sealed cover and using the transport vehicle to horizontally enter and exit the sealed cover, the inclined flue is transported in and out from one side of the sealed cover, avoiding complicated operations such as disassembling and reassembling the electric arc furnace body. Thereby, the time and cost for maintaining the inclined flue are reduced, and potential safety hazards are eliminated. By adjusting the height of the inclined flue through the lifting mechanism, it is beneficial to lift the bottom end of the inclined flue out of the settling chamber and move it outside the sealed cover, and can also lower the lower end of the inclined flue into the settling chamber and the upper end of the inclined flue to the assembly height, which is beneficial to complete the connection between the inclined flue and the electric arc furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings.

[0040] Figure 1 Flow chart of the method for quickly maintaining the inclined flue of the electric arc furnace according to the present invention;

[0041] Figure 2 Schematic diagram of the replacement method of the inclined flue before improvement;

[0042] Figure 3 Schematic diagram of the replacement method of the inclined flue according to the present invention;

[0043] Figure 4 For Figure 3 Top view of the shown transport vehicle;

[0044] Figure 5 For Figure 4 Top view of the shown transport vehicle when carrying the inclined flue;

[0045] Figure 6 For Figure 4 Schematic diagram of the structure of the shown transport vehicle when the connecting mechanism is disconnected;

[0046] Figure 7 For Figure 5 Schematic diagram of the enlarged view of the shown position A;

[0047] Figure 8 For Figure 4 Side view of the shown transport vehicle;

[0048] Figure 9 For Figure 8 Side view of the shown transport vehicle when carrying the inclined flue.

[0049] Description of the reference numerals in the drawings: 1. Electric arc furnace; 2. Concrete wall of the closed hood; 3. Inclined flue; 4. Four-hole water-cooled elbow of the electric furnace; 5. Settling chamber; 6. Large furnace cover; 7. Upper furnace shell of the electric arc furnace; 8. Electrode; 9. Auxiliary hook of the crane; 10. Gantry hook of the crane; 11. 10-ton chain block; 12. Movable door of the closed hood of the electric arc furnace; 13. Fixed top plate of the closed hood of the electric arc furnace; 14. Hoisting-in and hoisting-out direction of the inclined flue before improvement; 15. Movable cover plate for overhauling the inclined flue; 17. Moving direction of the inclined flue after improvement; 18. Vehicle body; 18a. Driving end; 18b. Non-driving end; 181. Connecting mechanism; 181a. First telescopic driver; 181b. Second telescopic driver; 182a. First crossbeam split body; 1821a. Clamping groove; 1821b. Clamping part; 182b. Second crossbeam split body; 183. Lifting mechanism; 1831. Support member; 1832a. First lifting driver; 1832b. Second lifting driver; 184. Driving mechanism; 1841. Hydraulic pump station; 1842. Electric control box; 186a. Crossbeam; 186b. Movable crossbeam; 187. Avoidance passage; 188. Notch; 19. Traveling track; 20. Avoidance opening; X. Moving direction of the transport vehicle. Detailed implementation manners

[0050] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention. Embodiment

[0051] In an embodiment of the present invention, with reference to Figure 1 as shown, the present invention discloses a method for quickly maintaining the inclined flue of an electric arc furnace, which further includes the following steps:

[0052] An avoidance opening is formed in the closed hood wall corresponding to the inclined flue.

[0053] A transport vehicle with a lifting mechanism and a connecting mechanism is configured. The connecting mechanism is opened to enable the transport vehicle to form an avoidance for the inclined flue in the closed hood. The transport vehicle passes through the avoidance opening and moves into the closed hood, and the lifting mechanism is moved to the lower part of the inclined flue. The connecting mechanism is closed to strengthen the transport vehicle. The lifting mechanism is raised to support the inclined flue, the connection between the inclined flue and the furnace body of the electric arc furnace is disconnected, the lifting mechanism continues to rise to lift the bottom end of the inclined flue out of the settling chamber, and the transport vehicle transports the inclined flue out of the closed hood through the avoidance opening.

[0054] Repair or replace the inclined flue, use a transport vehicle to move the repaired or replaced inclined flue into the sealed hood, use a lifting mechanism to lower the bottom end of the inclined flue into the settling chamber, connect the inclined flue to the electric arc furnace body, continue to lower the lifting mechanism until it disengages from the inclined flue, open the connecting mechanism to allow the transport vehicle to avoid the assembled inclined flue, move the transport vehicle outside the sealed hood, and seal the avoidance opening.

[0055] For the method of quickly maintaining the inclined flue of an electric arc furnace according to the present invention, an avoidance opening is provided on one side of the sealed hood wall facing the inclined flue, and the avoidance opening allows the transport vehicle and the inclined flue placed on the transport vehicle to pass through simultaneously. Before disassembling the inclined flue, first open the connecting mechanism of the transport vehicle so that the transport vehicle itself can avoid the inclined flue in the sealed hood. Then, the transport vehicle moves horizontally through the avoidance opening into the sealed hood until the lifting mechanism moves to a position where it can support the inclined flue. Then, close the connecting mechanism to strengthen the transport vehicle itself and improve its load-bearing capacity. The lifting mechanism rises to the height of supporting the inclined flue. First, ensure the force balance of the inclined flue, and then disconnect the connection between the inclined flue and the electric arc furnace body, so that the inclined flue falls on the transport vehicle and is horizontally moved by the transport vehicle outside the sealed hood for replacement or maintenance. Then, horizontally move the replaced or maintained inclined flue into the sealed hood for assembly. It is no longer limited to the maintenance method of using a crane to lift the inclined flue, thus avoiding the cumbersome operation of disassembling and reassembling the electric arc furnace body. Only need to disconnect and connect the upper end of the inclined flue and the outlet of the four-hole water-cooled elbow of the electric furnace, which greatly reduces the time and cost of maintaining the inclined flue, and also avoids the safety hazard of the crane pulling the inclined flue obliquely, providing the safety of maintaining the inclined flue.

[0056] Before disassembling the inclined flue, the lifting mechanism rises to the height where it can support the inclined flue and then stops. Then, disconnect the connection between the inclined flue and the outlet of the four-hole water-cooled elbow of the electric furnace. There is no need to adjust the position of the inclined flue, and the inclined flue directly seats on the transport vehicle. Then, the lifting mechanism continues to rise to lift the bottom end of the old inclined flue out of the settling chamber, ensuring that the lower end of the old inclined flue can avoid the settling chamber. Then, the transport vehicle horizontally moves the old inclined flue outside the sealed hood. After the new inclined flue is sent into the sealed hood, the lifting mechanism descends to lower the bottom end of the new inclined flue to a predetermined height in the settling chamber and then stops. Then, complete the connection between the new inclined flue and the outlet of the four-hole water-cooled elbow of the electric furnace. Then, the lifting mechanism continues to descend to the height where it disengages from the inclined flue, and open the connecting mechanism so that the transport vehicle itself avoids the assembled inclined flue, and then the transport vehicle can be horizontally moved outside the sealed hood.

[0057] In one embodiment of the present invention, if there is a small area of water leakage in the inclined flue, after the transport vehicle moves the inclined flue outside the closed hood, the inclined flue located on the transport vehicle is directly maintained, such as welding repair and other operations, and then the maintained inclined flue is moved back into the closed hood for reassembly, completing the maintenance of the inclined flue, and shortening the shutdown welding repair time for the water leakage of the inclined flue from the original 16 hours to 3 hours; if there is a large area of water leakage in the inclined flue, after moving the inclined flue outside the closed hood, the inclined flue on the transport vehicle is hoisted to the repair area for repair by a crane, and a new inclined flue located in the repair area is hoisted onto the transport vehicle, and the transport vehicle moves the new inclined flue into the closed hood for assembly, completing the replacement of the inclined flue, and shortening the overall replacement time of the inclined flue from the original 72 hours to 6 hours.

[0058] In one embodiment of the present invention, the following steps are further included:

[0059] An avoidance passage is configured for the above-mentioned transport vehicle. During the process of the transport vehicle moving to the closed hood, the transport vehicle uses the avoidance passage to avoid the inclined flue. Specifically, since the bottom end of the inclined flue is inserted into the settling chamber, the avoidance passage enables the transport vehicle to continue moving inward relative to the inclined flue towards the inside of the closed hood, ensuring that the inclined flue can passively enter the middle of the transport vehicle so that the lifting mechanism can perform lifting operations on the inclined flue.

[0060] A connecting mechanism is configured for the above-mentioned transport vehicle. The connecting mechanism is configured to have a connected state and a disconnected state. The connecting mechanism in the connected state strengthens the transport vehicle and locks the avoidance passage, and the connecting mechanism in the disconnected state unlocks the avoidance passage. Specifically, after configuring the avoidance passage, the interior of the transport vehicle is hollow, resulting in insufficient stability. The connecting mechanism is used to connect the vehicle bodies of the transport vehicle on both sides of the avoidance passage to make up for the defect of insufficient structural stability of the transport vehicle, realizing the strengthening of the transport vehicle and preventing the weight of the inclined flue from damaging the transport vehicle. When the connecting mechanism is disconnected, the avoidance passage is opened.

[0061] In one embodiment of the present invention, the following steps are further included:

[0062] Traveling tracks are configured on both sides of the settling chamber. The traveling tracks extend from outside the closed hood through the avoidance openings to the inside of the closed hood. The traveling tracks are used to support and guide the transport vehicle, and the transport vehicle moves above the settling chamber along the traveling tracks to disassemble and assemble the inclined flue.

[0063] The lifting mechanism is configured in the middle of the transport vehicle and on both sides of the avoidance passage. The two sides of the inclined flue are respectively supported by the lifting mechanisms on both sides. Specifically, when the inclined flue moves to the middle of the avoidance passage, the lifting mechanisms are just located below both sides of the inclined flue. The lifting mechanisms rise to support both sides of the inclined flue, keeping the inclined flue balanced and transferring the weight of the inclined flue to the middle of the transport vehicle to prevent the transport vehicle from tipping over.

[0064] In an embodiment of the present invention, the avoidance passage is configured to penetrate the transport vehicle vertically and extend from the end of the transport vehicle in the moving direction of the transport vehicle to the middle of the transport vehicle. Before the transport vehicle enters the sealed cover, the avoidance passage is first aligned with the inclined flue. During the process of the transport vehicle moving into the sealed cover, the inclined flue enters the middle of the transport vehicle passively from the end of the transport vehicle, without the need to adjust the direction of the transport vehicle.

[0065] In an embodiment of the present invention, the following steps are further included:

[0066] The connection mechanism is changed from the connected state to the disconnected state, and then the transport vehicle is moved into the sealed cover. Specifically, when the transport vehicle is outside the sealed cover, its connection mechanism is in the connected state and needs to be changed to the disconnected state before entering the sealed cover to avoid the inclined flue that has not been disconnected.

[0067] After the connection mechanism is changed from the connected state to the disconnected state, the transport vehicle is moved outside the sealed cover. Specifically, after the flue is seated and the connection of the four-hole water-cooled elbow outlet of the electric furnace is completed, the connection mechanism is changed to the disconnected state, so that the avoidance passage is in the open state, and the inclined flue is avoided during the process of the transport vehicle moving outside the sealed cover;

[0068] First, the connection mechanism is changed from the disconnected state to the connected state, and then it is lifted by the lifting mechanism to support the inclined flue. Specifically, when disassembling the inclined flue, after the inclined flue enters the middle of the avoidance passage, the disconnected connection mechanism is first changed to the connected state, and after strengthening the transport vehicle, the lifting mechanism is used to lift and support the inclined flue to prevent damage to the transport vehicle caused by the weight of the inclined flue;

[0069] The lifting mechanism descends to lower the lower end of the inclined flue into the settling chamber and lower the upper end of the inclined flue to align with the four-hole water-cooled elbow outlet. Specifically, the lifting mechanism descends to lower the lower end of the inclined flue into the settling chamber, and then continues to descend to lower the upper end of the inclined flue to the height where it aligns with the four-hole water-cooled elbow outlet and then stops descending, which can not only ensure that the lower end of the inclined flue is completely inserted into the settling chamber, but also quickly complete the connection between the upper end of the inclined flue and the four-hole water-cooled elbow outlet.

[0070] In an embodiment of the present invention, the following steps are further included:

[0071] A water-cooled flexible joint is configured at the upper end of the inclined flue, and the free end of the water-cooled flexible joint is used to non-contact connect the four-hole water-cooled elbow outlet. Specifically, after the inclined flue is in place, the free end of the water-cooled flexible joint is non-contact connected to the four-hole water-cooled elbow outlet by translating the water-cooled flexible joint. During the electric furnace smelting production, according to the needs of the electric arc furnace production process, the gap between the four-hole water-cooled elbow and the inclined flue is adjusted through the water-cooled flexible joint, which can not only ensure that the flue gas during the electric furnace smelting production is discharged along the inclined flue, but also enable the four-hole water-cooled elbow to follow the lifting and rotation of the large furnace cover.

[0072] The advantages of the method for quickly maintaining the inclined flue of an electric arc furnace according to the present invention are as follows:

[0073] It is no longer restricted by the skewed lifting of the crane, avoiding the cumbersome operation of disassembling and reassembling the furnace body of the electric arc furnace. Only the upper end of the inclined flue and the outlet of the four-hole water-cooled elbow of the electric furnace need to be disconnected and connected, greatly reducing the time-consuming for maintaining the inclined flue. It also avoids the safety hazards of the skewed lifting of the crane, providing the safety for the work of maintaining the inclined flue. Embodiment

[0074] Refer to Figure 3 and Figure 4 As shown, a transport vehicle is also provided for implementing the method for quickly maintaining the inclined flue of an electric arc furnace, including:

[0075] Vehicle body 18;

[0076] A plurality of lifting mechanisms 183, the plurality of lifting mechanisms 183 are distributed on both sides of the vehicle body 18 along the moving direction X of the vehicle body 18. The lifting mechanism 183 includes a support member 1831 and a first lifting driver 1832a and a second lifting driver 1832b for driving the support member 1831 to lift.

[0077] For the transport vehicle according to the present invention, after the vehicle body 18 passes through the avoidance opening 20 of the closed hood concrete wall 2 and enters the closed hood, the support member 1831 is lifted to support both sides of the inclined flue 3. After ensuring the force balance of the inclined flue 3, the inclined flue 3 is disconnected from the outlet of the four-hole water-cooled elbow 4 of the electric furnace. The first lifting driver 1832a and the second lifting driver 1832b continue to lift the support member 1831 to lift the lower end of the inclined flue 3 above the settling chamber 5, completing the loading of the inclined flue 3 onto the vehicle. At the same time, it avoids the obstruction of the top of the settling chamber 5 to the lower end of the inclined flue 3, so that the transport vehicle can smoothly transport the inclined flue 3 horizontally out of the closed hood and transport the maintained inclined flue 3 into the closed hood for assembly. Only the upper end of the inclined flue 3 and the outlet of the four-hole water-cooled elbow 4 of the electric furnace need to be disconnected and connected, without the cumbersome operation of disassembling and reassembling the furnace body of the electric arc furnace 1, greatly reducing the time-consuming and cost for maintaining the inclined flue 3. It also avoids the safety hazards of the skewed lifting of the crane, providing the safety for the work of maintaining the inclined flue 3.

[0078] Refer to Figure 5 and Figure 6As shown, in an embodiment of the present invention, the vehicle body 18 is provided as a hollow frame connected by a plurality of cross beams. An avoidance channel 187 is provided in the middle of the hollow frame. The plurality of cross beams include a movable cross beam 186b. The movable cross beam 186b is arranged at one end of the hollow frame along the moving direction X. The movable cross beam 186b is disconnected from the middle to form a first cross beam split body 182a and a second cross beam split body 182b. The first cross beam split body 182a and the second cross beam split body 182b are respectively slidably connected to both sides of the hollow frame along their axial directions. The first cross beam split body 182a and the second cross beam split body 182b can be detachably connected at the disconnection point. When the first cross beam split body 182a and the second cross beam split body 182b move relatively away from each other along their axial directions, a notch 188 communicating with the avoidance channel 187 is formed in the hollow frame. The inclined flue 3 enters the middle of the avoidance channel 187 through the notch 188. When the first cross beam split body 182a and the second cross beam split body 182b are connected, a complete movable cross beam 186b is formed to strengthen the structural strength of the hollow frame.

[0079] Referring to Figure 5 As shown, in an embodiment of the present invention, the hollow frame includes at least four cross beams. The four cross beams include three fixed cross beams 186a and one movable cross beam 186b. The three fixed cross beams 186a are fixedly connected.

[0080] Referring to Figure 5 As shown, in an embodiment of the present invention, it further includes a first telescopic driver 181a and a second telescopic driver 181b arranged on both sides of the hollow frame. The first telescopic driver 181a and the second telescopic driver 181b respectively drive the first cross beam split body 182a and the second cross beam split body 182b to move reversely along their axial directions, so as to realize the automatic approach or separation of the first cross beam split body 182a and the second cross beam split body 182b. Among them, the first cross beam split body 182a and the first telescopic driver 181a form a connecting mechanism 181, and the second cross beam split body 182b and the second telescopic driver 181b form another connecting mechanism 181.

[0081] In an embodiment of the present invention, the first telescopic driver 181a, the second telescopic driver 181b, the first lifting driver 1832a and the second lifting driver 1832b are all provided as hydraulic cylinders.

[0082] Referring to Figure 7As shown, in an embodiment of the present invention, a clamping groove 1821a is provided on the end face of the first crossbeam split body 182a, and a clamping portion 1821b is provided on the end face of the second crossbeam split body 182b. When the first crossbeam split body 182a and the second crossbeam split body 182b approach each other relatively along their axial directions, the clamping portion 1821b can be inserted into the clamping groove 1821a. The clamping portion 1821b and the clamping groove 1821a are used to limit the degrees of freedom of the second crossbeam split body 182b by the first crossbeam split body 182a, preventing the first crossbeam split body 182a and the second crossbeam split body 182b from being displaced or even bent under the weight of the inclined flue 3.

[0083] Referring to Figure 7 As shown, in an embodiment of the present invention, the end of the second crossbeam split body 182b gradually tapers to form a clamping portion 1821b, and the clamping portion 1821b can be accurately inserted into the clamping groove 1821a to ensure the coaxial connection of the first crossbeam split body 182a and the second crossbeam split body 182b.

[0084] Referring to Figure 7 As shown, in an embodiment of the present invention, the clamping groove 1821a and the clamping portion 1821b are in profile matching, which can reduce the gap between the clamping groove 1821a and the clamping portion 1821b and reduce the radial movement amount of the first crossbeam split body 182a and the second crossbeam split body 182b.

[0085] Referring to Figure 5 、 Figure 8 and Figure 9 As shown, in an embodiment of the present invention, it includes two lifting mechanisms 183 provided in the middle of the vehicle body 18 and distributed on the two opposite sides of the avoidance channel 187. The two lifting mechanisms 183 respectively support both sides of the inclined flue 3 to ensure the balanced force of the inclined flue 3.

[0086] In an embodiment of the present invention, the transport vehicle further includes a driving mechanism 184. The driving mechanism 184 includes a motor, a speed reducer, a universal coupling sleeve, wheels, etc., and is used to drive the vehicle body 18 to move.

[0087] Referring to Figure 4 As shown, in an embodiment of the present invention, it further includes a hydraulic pump station 1841 for providing controllable hydraulic energy for hydraulic devices such as hydraulic cylinders. The hydraulic pump station 1841 includes a pump station and a hydraulic control valve platform.

[0088] Referring to Figure 4As shown, in an embodiment of the present invention, it further includes an electric control box 1842, which is used to control the motor of the driving mechanism 184, the hydraulic pump station 1841, the hydraulic control valve, the travel limit switch of the transport vehicle, the limit switch of the inclined flue lifting mechanism, the limit switches of the first telescopic driver 181a and the second telescopic driver 181b, etc.

[0089] Referring to Figure 6 As shown, in an embodiment of the present invention, both ends of the vehicle body 18 along its moving direction X are respectively set as a driving end 18a and a non-driving end 18b. The movable cross beam 186b is arranged at the non-driving end 18b, and the driving mechanism 184, the hydraulic pump station 1841 and the electric control box 1842 are all arranged at the driving end 18a.

[0090] Referring to Figure 3 As shown, in an embodiment of the present invention, it further includes travel tracks 19 arranged on both sides of the settling chamber 5. The travel tracks 19 extend from outside the sealed cover through the avoidance opening 20 into the sealed cover, and the vehicle body 18 moves along the travel tracks 19.

[0091] The working principle of the transport vehicle of the present invention is:

[0092] When the inclined flue 3 is disassembled, the vehicle body 18 passes through the avoidance opening 20 and enters the sealed cover. The vehicle body 18 uses the avoidance channel 187 to avoid the inclined flue 3 until the lifting mechanism 183 is located below both sides of the inclined flue 3 and then stops. The first cross beam split body 182a and the second cross beam split body 182b move relatively closer until the clamping part 1821b is inserted into the clamping groove 1821a and then stops. The support member 1831 rises to just support the inclined flue 3. After the inclined flue 3 and the outlet of the four-hole water-cooled elbow 4 of the electric furnace are disconnected, the support member 1831 continues to rise to lift the lower end of the inclined flue 3 out of the settling chamber 5, and the vehicle body 18 moves in the reverse direction to move the inclined flue 3 outside the sealed cover; when the inclined flue 3 is assembled, the transport vehicle passes through the avoidance opening 20 to move the inclined flue 3 into the sealed cover. Then the support member 1831 descends to lower the lower end of the inclined flue 3 into the settling chamber 5 until the upper end of the inclined flue 3 is aligned with the outlet of the four-hole water-cooled elbow 4 of the electric furnace. After the connection between the inclined flue 3 and the outlet of the four-hole water-cooled elbow 4 of the electric furnace is completed, the support member 1831 continues to descend and disengages from the inclined flue 3. The first cross beam split body 182a and the second cross beam split body 182b move relatively away to release the avoidance channel 187 and avoid the inclined flue 3, and the transport vehicle moves outside the sealed cover.

[0093] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A method for quickly maintaining an arc furnace inclined flue, characterized in that: The following steps are also included: A avoidance opening is provided on the wall of the closed hood corresponding to the inclined flue; A transport vehicle with a lifting mechanism and a connecting mechanism is configured. The connecting mechanism is opened to allow the transport vehicle to avoid the inclined flue in the closed cover. The transport vehicle passes through the avoidance opening and moves into the closed cover, and the lifting mechanism is moved to the bottom of the inclined flue. The connecting mechanism is closed to strengthen the transport vehicle. The lifting mechanism is raised to support the inclined flue, and the connection between the inclined flue and the arc furnace body is disconnected. The lifting mechanism continues to rise to lift the bottom end of the inclined flue out of the settling chamber, and the transport vehicle passes through the avoidance opening to transport the inclined flue to the outside of the closed cover. The inclined flue is repaired or replaced, and the repaired or replaced inclined flue is moved into the closed cover by a transport vehicle. The bottom end of the inclined flue is lowered into the settling chamber by a lifting mechanism, and the inclined flue is connected to the arc furnace body. The lifting mechanism continues to descend until it is detached from the inclined flue, and the connecting mechanism is opened to allow the transport vehicle to avoid the assembled inclined flue. The transport vehicle is moved outside the closed cover to seal the avoidance opening.

2. A method for quickly maintaining an arc furnace inclined flue according to claim 1, characterized in that: The following steps are also included: An avoidance passage is provided for the above-mentioned transport vehicle, and when the transport vehicle moves to the closed cover, the transport vehicle uses the avoidance passage to avoid the inclined flue; The avoidance passage is configured to penetrate the transport vehicle in a vertical direction and extend from an end of the transport vehicle to a middle portion of the transport vehicle along a moving direction of the transport vehicle; The lifting mechanism is arranged in the middle of the transport vehicle and located on both sides of the avoidance passage, and the lifting mechanisms on both sides are used to respectively support both sides of the inclined flue.

3. A method for quickly maintaining an arc furnace inclined flue according to claim 2, characterized in that: The following steps are also included: The connection mechanism is configured to have a connection state and a disconnection state. The connection mechanism in the connection state strengthens the transport vehicle and locks the avoidance passage, and the connection mechanism in the disconnection state releases the avoidance passage.

4. A method for quickly maintaining an arc furnace inclined flue according to claim 3, characterized in that: The following steps are also included: The connection mechanism changes from a connected state to a disconnected state, and then the transport vehicle is moved into the closed cover; The connection mechanism changes from a connected state to a disconnected state, and then the transport vehicle is moved outside the closed cover; First, the connection mechanism is changed from a disconnected state to a connected state, and then the lifting mechanism is used to lift it up to support the inclined flue; The lifting mechanism descends to lower the lower end of the inclined flue into the settling chamber, and lowers the upper end of the inclined flue to align with the outlet of the four-hole water-cooled elbow.

5. A method for quickly maintaining an arc furnace inclined flue according to claim 1, characterized in that: The following steps are also included: Walking tracks are arranged on both sides of the sedimentation chamber. The walking tracks extend from outside the closed cover through the avoidance opening to inside the closed cover, and the transport vehicle is supported and guided by the walking tracks.

6. A transport vehicle for implementing a method for quickly maintaining an inclined flue of an electric arc furnace as claimed in any one of claims 1 to 5, characterized in that: include, Vehicle body; A plurality of lifting mechanisms are distributed on both sides of the vehicle body along the moving direction of the vehicle body, and the lifting mechanisms include a support member and a lifting driver for driving the support member to rise and fall.

7. A transport vehicle according to claim 6, characterized in that: The vehicle body is configured as a hollow frame formed by connecting a plurality of cross beams, a avoidance passage is provided in the middle of the hollow frame, the plurality of cross beams include a movable cross beam that can be disassembled or opened and closed, the movable cross beam is arranged at one end of the hollow frame along the moving direction, the plurality of lifting mechanisms are arranged in the middle of the hollow frame, and the plurality of lifting mechanisms are distributed on both sides of the avoidance passage.

8. A transport vehicle according to claim 7, characterized in that: The movable crossbeam is broken from the middle to form a first crossbeam split and a second crossbeam split. The first crossbeam split and the second crossbeam split are respectively connected to the two sides of the hollow frame along their axial sliding. The first crossbeam split and the second crossbeam split can be disassembled and connected at the break. When the first crossbeam split and the second crossbeam split are relatively far apart along their axial direction, the hollow frame forms a gap that passes through the avoidance channel.

9. A transport vehicle according to claim 8, characterized in that: It also includes a plurality of telescopic drivers arranged on the hollow frame, and the plurality of telescopic drivers respectively drive the first crossbeam split and the second crossbeam split to move in opposite directions along their axial directions.

10. A transport vehicle according to claim 8, characterized in that: The end surface of the first beam split is provided with a clamping groove, and the end surface of the second beam split is provided with a clamping portion. When the first beam split and the second beam split are relatively close to each other along their axial direction, the clamping portion is inserted into the clamping groove.

Images