Method for quickly maintaining inclined flue of electric arc furnace and transport vehicle

Abstract

The invention relates to a method for rapidly maintaining an inclined flue of an electric arc furnace and a transport vehicle. The method comprises the following steps that an avoiding opening is formed in a wall body of a closed hood; a transport vehicle with a lifting mechanism and a connecting mechanism is arranged, the connecting mechanism is opened, the transport vehicle penetrates through the receding opening to move into the closed cover, the connecting mechanism is closed, the lifting mechanism is lifted to support the inclined flue, the inclined flue and the electric arc furnace body are disconnected, the lifting mechanism lifts the bottom end of the inclined flue out of the settling chamber, and the transport vehicle transports the inclined flue out of the closed cover; the transportation vehicle moves the maintained or replaced inclined flue into the closed hood, the lifting mechanism descends to enable the bottom end of the inclined flue to descend into the settling chamber, the inclined flue and the electric arc furnace body are connected, the lifting mechanism continues to descend to be separated from the inclined flue, the connecting mechanism is opened, the transportation vehicle moves out of the closed hood, and the receding opening is sealed. The electric arc furnace body is prevented from being disassembled, assembled and the like, time consumption and cost for maintaining the inclined flue are reduced, and potential safety hazards are eliminated.

Description

Technical Field

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

[0002] In the steel smelting industry, electric arc furnaces mainly use high-temperature electric arcs to heat scrap steel to a molten state to provide liquid steel for subsequent refining. In order to prevent smoke and dust from overflowing and reduce noise hazards during electric arc furnace smelting production, large enclosed hoods are now added to the electric arc furnace area as protection according to environmental protection requirements. The wall of the electric arc furnace enclosed hood is a concrete structure. After the enclosed hood is built, the dust removal water-cooled inclined flue of the electric arc furnace is inclined through the concrete wall of the enclosed hood. 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) to the entrance of the combustion and settling chamber. The complex environment of the electric arc furnace causes the inclined flue to often leak, and it needs to be disassembled and maintained regularly. The entrance area of ​​the combustion and settling chamber is a high-temperature and high-risk area, so the replacement of the inclined flue is difficult.

[0003] The arc furnace body is located on the inner side of the inclined flue relative to the wall of the closed cover. Due to the limitation of spatial position and the inclination of the inclined flue, before replacing the inclined flue, the equipment and facilities that affect the lifting, such as the four-hole water-cooled elbow of the arc furnace body, the large furnace cover, the upper furnace shell of the arc furnace, and the electrodes, need to be removed and lifted to avoid collision with the inclined flue. It is also necessary to replace the auxiliary hook wire rope of the 150-ton bridge crane and adjust the main hook gantry plate hook. During replacement, the upper part of the inclined flue is hoisted on the side of the arc furnace in the closed cover by the auxiliary hook of the crane. The auxiliary hook wire rope of the crane is close to the closed cover to fix the top plate. At the same time, two A 10-ton hand chain hoist holds the lower part of the inclined flue on the side of the settling chamber outside the wall of the enclosed hood (opposite the arc furnace), and the crane and the hand chain hoist work closely together to slowly lift the old inclined flue out of the enclosed hood and lift the new inclined flue in; after the new inclined flue is in place and stable, the crane's auxiliary hook is unhooked; finally, the upper furnace shell, large furnace cover, four-hole water-cooled elbow of the arc furnace are reinstalled, and the refractory materials in the arc furnace are repaired to complete the replacement. At present, the single replacement of the inclined flue takes about 72 hours, and the losses caused by the suspension of production are relatively large. Due to the fixed top plate position of the enclosed hood, the wire rope of the 150-ton bridge crane's auxiliary hook is forced to be tilted and tilted, posing a safety hazard.

[0004] During the production of electric arc furnace, if there is a small-scale water leakage in the inclined flue and it does not affect safety, it is usually necessary to wait until the monthly furnace construction and maintenance to carry out welding repair. If there is a large-scale water leakage that affects safety, production must be stopped immediately for processing. It takes about 16 hours from stopping the furnace, cooling, draining water, setting up a temporary maintenance platform, welding repair, testing water and pressure, dismantling the temporary maintenance platform to resuming production, resulting in production interruption. Therefore, water leakage in the inclined flue is often not handled in time, resulting in insufficient 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 lifting by crane has high work intensity, long time consumption, and safety hazards in the lifting operation, and thus provide a method and transport vehicle for quickly maintaining the inclined flue of an electric arc furnace, which greatly reduces the time, cost and work intensity of the inclined flue maintenance, and also improves the safety of maintaining the inclined flue.

[0006] In order to solve the above technical problems, the present invention provides a method for quickly maintaining an inclined flue of an electric arc furnace, which further comprises the following steps: 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.

[0007] In one embodiment of the present invention, the following steps are also included: An avoidance passage is provided for the above-mentioned transport vehicle. When the transport vehicle moves to the closed cover, the transport vehicle uses the avoidance passage to avoid the inclined flue.

[0008] In one embodiment of the present invention, the following steps are also included: 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.

[0009] In one embodiment of the present invention, the following steps are also included: The avoidance passage is configured to penetrate the transport vehicle in a 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.

[0010] In one embodiment of the present invention, 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.

[0011] In one embodiment of the present invention, 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 is changed from a connection state to a disconnection state, and then the transport vehicle is moved outside the closed cover.

[0012] In one embodiment of the present invention, the following steps are also included: 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.

[0013] In one embodiment of the present invention, 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.

[0014] A transport vehicle is also provided for implementing the method for quickly maintaining the inclined flue of an electric arc furnace, comprising: 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.

[0015] In one embodiment of the present invention, the vehicle body is configured as a hollow frame formed by connecting a plurality of cross beams, a avoidance channel 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, and the movable cross beam is arranged at one end of the hollow frame along the moving direction.

[0016] In one embodiment of the present invention, the plurality of lifting mechanisms are disposed in the middle of the vehicle body, and the plurality of lifting mechanisms are distributed on both sides of the avoidance passage.

[0017] In one embodiment of the present invention, the movable crossbeam is broken from the middle to form a first crossbeam split and a second crossbeam split, and the first crossbeam split and the second crossbeam split are respectively connected to the two sides of the hollow frame along their axial sliding, and the first crossbeam split and the second crossbeam split can be disassembled and connected at the break, and 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.

[0018] In one embodiment of the present invention, it further comprises a plurality of telescopic drivers disposed on the hollow frame, wherein 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.

[0019] In one embodiment of the present invention, a clamping groove is provided on the end surface of the first beam split, and a clamping portion is provided on the end surface of the second beam split. 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.

[0020] In one embodiment of the present invention, the transport vehicle further comprises a driving mechanism, and the driving mechanism drives the vehicle body to move.

[0021] In one embodiment of the present invention, the two ends of the vehicle body along its moving direction are respectively arranged 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.

[0022] In one embodiment of the present invention, it also includes running tracks arranged on both sides of the sedimentation chamber, the running tracks extend from outside the closed cover through the avoidance opening to inside the closed cover, and the vehicle body moves along the running tracks.

[0023] The above technical solution of the present invention has the following advantages compared with the prior art: The method for quickly maintaining the inclined flue of an electric arc furnace described in the present invention opens a avoidance opening on the wall of the closed cover, uses a transport vehicle to horizontally enter and exit the closed cover, and transports the inclined flue in and out from one side of the closed cover, thereby avoiding complicated operations such as disassembly and reassembly of the electric arc furnace body, thereby reducing the time and cost of maintaining the inclined flue and eliminating safety hazards; the height of the inclined flue is adjusted by a lifting mechanism, which is conducive to lifting the bottom end of the inclined flue out of the settling chamber and moving it out of the closed 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 conducive to completing the connection between the inclined flue and the electric arc furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0025] Figure 1 A flow chart of the method for quickly maintaining the inclined flue of an electric arc furnace according to the present invention; Figure 2 A schematic diagram of the replacement method for improving the front inclined flue; Figure 3 A schematic diagram of a replacement method of the inclined flue of the present invention; Figure 4 for Figure 3 A top view of the transport vehicle shown; Figure 5 for Figure 4 The transport vehicle shown is a top view of the inclined flue; Figure 6 for Figure 4 A schematic diagram of the structure of the transport vehicle when the connecting mechanism is disconnected; Figure 7 for Figure 5 A schematic diagram of the structure of the enlarged view shown at A; Figure 8 for Figure 4 a side view of the transport vehicle shown; Fig. 9 for Figure 8 The transport vehicle shown is a side view of the transport vehicle carrying the inclined flue.

[0026] Description of the accompanying drawings: 1. electric arc furnace; 2. concrete wall of the closed cover; 3. inclined flue; 4. four-hole water-cooled elbow of the electric furnace; 5. sedimentation 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 hand chain hoist; 12. movable door of the closed cover of the electric arc furnace; 13. fixed top plate of the closed cover of the electric arc furnace; 14. hoisting direction of the inclined flue before improvement; 15. movable cover plate for maintenance of the inclined flue; 17. moving direction of the inclined flue after improvement; 18. car body; 18a. driving end; 18b. non-driving end; 181. Connecting mechanism; 181a, first telescopic driver; 181b, second telescopic driver; 182a, first crossbeam split; 1821a, snap-in groove; 1821b, snap-in portion; 182b, second crossbeam split; 183, lifting mechanism; 1831, supporting 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, gap; 19, walking track; 20, avoidance opening; X, moving direction of transport vehicle. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Example

[0028] In one embodiment of the present invention, referring to Figure 1 As shown, the present invention discloses a method for quickly maintaining an inclined flue of an electric arc furnace, which also includes the following steps: An escape opening is provided on the wall of the enclosed hood corresponding to the inclined flue.

[0029] 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 under 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 sedimentation chamber, and the transport vehicle passes through the avoidance opening to transport the inclined flue to the outside of the closed cover.

[0030] 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.

[0031] The method for quickly maintaining the inclined flue of an electric arc furnace disclosed by the present invention is to open an avoidance opening on the side of the wall of the closed cover facing the inclined flue, and the avoidance opening allows a transport vehicle and the inclined flue placed on the transport vehicle to pass through at the same time. Before disassembling the inclined flue, the connecting mechanism of the transport vehicle is first opened so that the transport vehicle itself can avoid the inclined flue in the sealed cover, and then the transport vehicle moves horizontally through the avoidance opening into the closed cover until the lifting mechanism moves to a position where the inclined flue can be supported, and then the connecting mechanism is closed to strengthen the transport vehicle itself, thereby improving the carrying capacity of the transport vehicle, and the lifting mechanism is raised to a height that supports the inclined flue, and first confirm that Ensure that the inclined flue is under balanced force, then disconnect the inclined flue from the arc furnace body, so that the inclined flue falls on the transport vehicle and is moved horizontally outside the closed cover by the transport vehicle for replacement or maintenance, and then the replaced or maintained inclined flue is moved horizontally into the closed cover for assembly. The maintenance method of the inclined flue is no longer limited to the crane lifting method, thus avoiding the tedious operation of disassembling and reassembling the arc furnace body. Only the upper end of the inclined flue and the four-hole water-cooled elbow outlet of the electric furnace need to be disconnected and connected, which greatly reduces the time and cost of inclined flue maintenance, avoids the safety hazards of crane tilting and lifting, and provides safety for the maintenance of the inclined flue.

[0032] Before disassembling the inclined flue, the lifting mechanism is raised to a height that can support the inclined flue and then stops, and then the connection between the inclined flue and the four-hole water-cooled elbow outlet of the electric furnace is disconnected. There is no need to adjust the position of the inclined flue, and the inclined flue is directly seated on the transport vehicle. Then the lifting mechanism continues to rise to lift the bottom end of the old inclined flue out of the sedimentation chamber, ensuring that the lower end of the old inclined flue can avoid the sedimentation chamber. Then the transport vehicle moves the old inclined flue horizontally to the outside of the closed hood. After the new inclined flue is sent into the closed hood, the lifting mechanism descends to lower the bottom end of the new inclined flue to a predetermined height in the sedimentation chamber and then stops, and then the connection between the new inclined flue and the four-hole water-cooled elbow outlet of the electric furnace is completed. Then the lifting mechanism continues to descend to a height that is separated from the inclined flue, and the connecting mechanism is opened, so that the transport vehicle itself avoids the assembled inclined flue, and the transport vehicle can be moved horizontally to the outside of the closed hood.

[0033] In one embodiment of the present invention, if a small area of ​​water leakage occurs in the inclined flue, the transport vehicle will move the inclined flue outside the enclosed cover, and then directly perform maintenance on the inclined flue on the transport vehicle, such as welding repair and other operations, and then move the maintained inclined flue into the enclosed cover for reassembly to complete the maintenance of the inclined flue, so that the production suspension welding repair time for the inclined flue leakage is shortened from the original 16 hours to 3 hours; if a large area of ​​water leakage occurs in the inclined flue, the inclined flue will be moved outside the enclosed cover, and the inclined flue on the transport vehicle will be lifted to the maintenance area for maintenance by a crane, and the new inclined flue in the maintenance area will be lifted onto the transport vehicle, and the transport vehicle will move the new inclined flue into the enclosed cover for assembly to complete the replacement of the inclined flue, and the overall replacement time of the inclined flue is shortened from the original 72 hours to 6 hours.

[0034] In one embodiment of the present invention, the following steps are also included: An avoidance channel is configured for the above-mentioned transport vehicle. When the transport vehicle moves to the closed cover, the transport vehicle uses the avoidance channel to avoid the inclined flue. Specifically, since the bottom end of the inclined flue is inserted into the settling chamber, the avoidance channel enables the transport vehicle to continue to move toward the inside of the closed cover relative to the inclined flue, ensuring that the inclined flue can passively enter the middle part of the transport vehicle so that the lifting mechanism can perform lifting operations on the inclined flue.

[0035] A connecting mechanism is configured for the above-mentioned transport vehicle, and 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 channel, and the connecting mechanism in the disconnected state unlocks the avoidance channel. Specifically, the interior of the transport vehicle after the avoidance channel is configured is hollow, resulting in insufficient stability. The connecting mechanism is used to connect the transport vehicle bodies on both sides of the avoidance channel to compensate for the defect of insufficient structural stability of the transport vehicle, thereby strengthening the transport vehicle and preventing the weight of the inclined flue from causing damage to the transport vehicle. When the connecting mechanism is disconnected, the avoidance channel is opened.

[0036] In one embodiment of the present invention, the following steps are also included: Walking tracks are arranged on both sides of the settling chamber. The walking tracks extend from outside the enclosed cover through the avoidance opening to inside the enclosed cover. The walking tracks are used to support and guide the transport vehicle. The transport vehicle moves above the settling chamber along the walking tracks to disassemble and assemble the inclined flue.

[0037] The lifting mechanism is configured in the middle of the transport vehicle and located on both sides of the avoidance channel, and the lifting mechanisms on both sides are used to support the two sides of the inclined flue respectively. Specifically, when the inclined flue is moved to the middle of the avoidance channel, the lifting mechanism is just located below the two sides of the inclined flue. The lifting mechanism rises to support the two sides of the inclined flue to keep the inclined flue balanced, and transfer the weight of the inclined flue to the middle of the transport vehicle to prevent the transport vehicle from overturning.

[0038] In one embodiment of the present invention, the avoidance channel is configured to penetrate the transport vehicle in a 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. Before the transport vehicle enters the enclosed cover, the avoidance channel is first aligned with the inclined flue. During the process of the transport vehicle moving into the enclosed cover, the inclined flue passively enters the middle of the transport vehicle from the end of the transport vehicle without adjusting the direction of the transport vehicle.

[0039] In one embodiment of the present invention, the following steps are also included: The connection mechanism is changed from a connected state to a disconnected state, and then the transport vehicle is moved into the enclosed cover. Specifically, when the transport vehicle is outside the enclosed cover, its connection mechanism is in a connected state, and before entering the enclosed cover, it needs to be changed to a disconnected state to avoid the undisconnected inclined flue.

[0040] After the connection mechanism is changed from the connection state to the disconnection state, the transport vehicle is moved outside the closed cover. Specifically, after the flue seat is connected to the outlet of the four-hole water-cooled elbow of the electric furnace, the connection mechanism is changed to the disconnection state, so that the avoidance channel is in an open state, and the inclined flue is avoided in the process of the transport vehicle being 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. 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 a connected state, and after the transport vehicle is strengthened, the lifting mechanism is used to lift and support the inclined flue to prevent the weight of the inclined flue from causing damage to the transport vehicle; 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 four-hole water-cooling 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 a height aligned with the four-hole water-cooling elbow outlet and then stops descending, which can ensure that the lower end of the inclined flue is completely inserted into the settling chamber, and can quickly complete the connection between the upper end of the inclined flue and the four-hole water-cooling elbow outlet.

[0041] In one embodiment of the present invention, the following steps are also included: A water-cooling looper is arranged at the upper end of the inclined flue, and the free end of the water-cooling looper is connected to the four-hole water-cooling elbow outlet in a non-contact manner. Specifically, after the inclined flue is in place, the free end of the water-cooling looper is connected to the four-hole water-cooling elbow outlet in a non-contact manner by translating the water-cooling looper. During electric furnace smelting production, the gap between the four-hole water-cooling elbow and the inclined flue is adjusted by the water-cooling looper according to the needs of the electric arc furnace production process, which can ensure that the flue gas during electric furnace smelting production is discharged along the inclined flue, and the four-hole water-cooling elbow can follow the lifting and rotation of the large furnace cover.

[0042] The advantages of the method for quickly maintaining the inclined flue of an electric arc furnace described in the present invention are: No longer restricted by the crooked and slanted lifting of the crane, the tedious operation of disassembling and reassembling the arc furnace body is avoided. It is only necessary to disconnect and connect the upper end of the inclined flue and the four-hole water-cooled elbow outlet of the electric furnace, which greatly reduces the time-consuming maintenance of the inclined flue, avoids the safety hazards of crooked and slanted lifting of the crane, and provides safety for the maintenance of the inclined flue. Example

[0043] Reference 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, comprising: Body 18; A 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 , and the lifting mechanisms 183 include a support member 1831 and a first lifting driver 1832a and a second lifting driver 1832b for driving the support member 1831 to rise and fall.

[0044] The transport vehicle of the present invention, after the vehicle body 18 passes through the avoidance opening 20 of the concrete wall 2 of the closed cover and enters the closed cover, uses the support member 1831 to rise to support both sides of the inclined flue 3, ensures that the inclined flue 3 is balanced in force, disconnects the inclined flue 3 from the outlet of the four-hole water-cooled elbow 4 of the electric furnace, and 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 to the top of the settling chamber 5, completes the loading of the inclined flue 3, and avoids the settling chamber 5. The top blocks the lower end of the inclined flue 3 so that the transport vehicle can smoothly move the inclined flue 3 horizontally to the outside of the closed cover, and move the maintained inclined flue 3 into the closed cover to complete the assembly. It is only necessary to disconnect and connect the upper end of the inclined flue 3 and the outlet of the four-hole water-cooled elbow 4 of the electric furnace, and there is no need to perform the tedious operation of disassembling and reassembling the furnace body of the electric arc furnace 1, which greatly reduces the time and cost of maintenance of the inclined flue 3, avoids the safety hazard of crooked and oblique lifting by the crane, and provides safety for the maintenance of the inclined flue 3.

[0045] Reference Figure 5 and Figure 6As shown, in one embodiment of the present invention, the vehicle body 18 is configured as a hollow frame connected by a plurality of beams, a middle portion of the hollow frame is provided with an avoidance channel 187, the plurality of beams include a movable beam 186b, the movable beam 186b is arranged at one end of the hollow frame along the moving direction X, the movable beam 186b is disconnected from the middle portion to form a first beam split 182a and a second beam split 182b, the first beam split 182a and the second beam split 182b are respectively connected to the hollow frame along their axial direction by sliding. On both sides of the frame, the first crossbeam split 182a and the second crossbeam split 182b can be disassembled and connected at the disconnection point. When the first crossbeam split 182a and the second crossbeam split 182b are relatively far away from each other along their axial direction, the hollow frame forms a notch 188 that penetrates the avoidance channel 187, and the inclined flue 3 enters the middle part of the avoidance channel 187 through the notch 188. When the first crossbeam split 182a and the second crossbeam split 182b are connected, a complete movable crossbeam 186b is formed to strengthen the structural strength of the hollow frame. Reference Figure 5 As shown, in one embodiment of the present invention, the hollow frame includes at least four beams, and the four beams include three fixed beams 186a and one movable beam 186b, and the three fixed beams 186a are fixedly connected.

[0046] Reference Figure 5 As shown, in one embodiment of the present invention, it also includes a first telescopic driver 181a and a second telescopic driver 181b arranged on both sides of the hollow frame, and the first telescopic driver 181a and the second telescopic driver 181b respectively drive the first beam split 182a and the second beam split 182b to move in opposite directions along their axial directions, so as to realize that the first beam split 182a and the second beam split 182b automatically approach or move away from each other, wherein the first beam split 182a and the first telescopic driver 181a form a connecting mechanism 181, and the second beam split 182b and the second telescopic driver 181b form another connecting mechanism 181.

[0047] In one 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 configured as hydraulic cylinders.

[0048] Reference Figure 7As shown, in one embodiment of the present invention, the end face of the first beam split 182a is provided with a clamping groove 1821a, and the end face of the second beam split 182b is provided with a clamping portion 1821b. When the first beam split 182a and the second beam split 182b are relatively close to each other along their axial direction, the clamping portion 1821b can be inserted into the clamping groove 1821a. The clamping portion 1821b and the clamping groove 1821a are used to enable the first beam split 182a to limit the freedom of the second beam split 182b, so as to prevent the first beam split 182a and the second beam split 182b from being dislocated or even bent under the weight of the inclined flue 3.

[0049] Reference Figure 7 As shown, in one embodiment of the present invention, the end of the second beam split 182b is gradually reduced to form a clamping portion 1821b, and the clamping portion 1821b can be accurately inserted into the clamping groove 1821a to ensure that the first beam split 182a and the second beam split 182b are coaxially connected.

[0050] Reference Figure 7 As shown, in one embodiment of the present invention, the snap-in groove 1821a and the snap-in portion 1821b are matched in profile, which can reduce the gap between the snap-in groove 1821a and the snap-in portion 1821b and reduce the radial movement of the first beam split 182a and the second beam split 182b.

[0051] Reference Figure 5 , Figure 8 and Fig. 9 As shown, in one embodiment of the present invention, two lifting mechanisms 183 are arranged in the middle of the vehicle body 18 and distributed on both sides opposite to the avoidance channel 187. The two lifting mechanisms 183 respectively support both sides of the inclined flue 3 to ensure that the inclined flue 3 is subjected to balanced force.

[0052] In one embodiment of the present invention, the transport vehicle further includes a driving mechanism 184, which includes a motor, a reducer, a universal coupling sleeve, wheels, etc., and is used to drive the vehicle body 18 to move.

[0053] Reference Figure 4 As shown, in one embodiment of the present invention, it also includes a hydraulic pump station 1841 for providing controllable hydraulic energy to hydraulic equipment such as hydraulic cylinders. The hydraulic pump station 1841 includes a pump station and a hydraulic control valve station.

[0054] Reference Figure 4As shown, in one embodiment of the present invention, it also includes an electrical control box 1842, which is used to control the motor of the drive mechanism 184, the hydraulic pump station 1841, the hydraulic control valve, the transport vehicle travel limit switch, the inclined flue lifting mechanism limit switch, the first telescopic drive 181a and the second telescopic drive 181b limit switch, etc.

[0055] Reference Figure 6 As shown, in one embodiment of the present invention, the two ends of the vehicle body 18 along its moving direction X are respectively set to the driving end 18a and the non-driving end 18b, the movable cross beam 186b is set at the non-driving end 18b, and the driving mechanism 184, the hydraulic pump station 1841 and the electric control box 1842 are all set at the driving end 18a.

[0056] Reference Figure 3 As shown, in one embodiment of the present invention, it also includes walking tracks 19 arranged on both sides of the sedimentation chamber 5, and the walking tracks 19 extend from outside the closed cover through the avoidance opening 20 to inside the closed cover, and the vehicle body 18 moves along the walking tracks 19.

[0057] The working principle of the transport vehicle of the present invention is: When the inclined flue 3 is disassembled, the car body 18 passes through the avoidance opening 20 and enters the closed cover. The car body 18 avoids the inclined flue 3 by using the avoidance passage 187 until the lifting mechanism 183 is located below the two sides of the inclined flue 3 and stops. The first crossbeam split 182a and the second crossbeam split 182b are relatively close to each other until the clamping portion 1821b is inserted into the clamping groove 1821a and stops. The support member 1831 rises to a height that just supports 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 car body 18 Move in the reverse direction to move the inclined flue 3 outside the enclosed 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 enclosed cover, and 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 inclined flue 3 is connected to the outlet of the four-hole water-cooled elbow 4 of the electric furnace, the support member 1831 continues to descend and detach from the inclined flue 3, the first crossbeam split 182a and the second crossbeam split 182b are relatively far away, the avoidance channel 187 is unlocked, the inclined flue 3 is avoided, and the transport vehicle is moved outside the enclosed cover.

[0058] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the 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.

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