Converter fire door protection device and steelmaking equipment

Abstract

The invention relates to the technical field of steelmaking, and discloses a converter fire door protection device and steelmaking equipment. The protection device comprises a fixed pulley block which is installed on the outer side of the first fireproof door. The winch comprises a main body and a driving structure, the main body is mounted on the outer side of the second fireproof door, and the driving structure is arranged on the outer side of the main body; the steel rope is coiled in an inner cavity of the main body; and the steel rope comprises a fixed end and a traction end, the fixed end is connected to the inner cavity of the main body, and the traction end is released from the inner cavity of the main body to the fixed pulley block under the action of the driving structure, penetrates through the fixed pulley block and then returns to the outer side of the second fireproof door to be fixed, so that a double-layer steel rope protective net is formed. By means of the scheme, the problems that potential safety hazards are large, the protection effect is poor, and work is inconvenient in the process of cleaning the stokehold fire door track are solved, and normal opening and closing of the fire door are maintained while the safety of operators is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of steelmaking, and particularly to a converter fire door protection device and a steelmaking equipment. Background Art

[0002] Currently, during the process of charging molten iron into a steelmaking converter, slag and cold steel are likely to accumulate on the track of the front furnace fire door due to splashing of molten iron and slag, resulting in jamming of the fire door, making it unable to open and close normally. In severe cases, the motor may even be damaged, affecting production. Therefore, it is necessary to regularly clean the accumulated slag and cold steel on the track. However, during the cleaning process, the fire door is usually in the open state, and it is easy for operators to lose their balance when prying cold steel or shoveling slag, thus posing a safety hazard of falling from the platform. Current protective measures mainly include manually hanging and removing steel ropes, temporarily setting up railings, or wearing safety belts, but these methods generally have problems such as poor protective effect, inconvenient use, and low blocking strength.

[0003] Therefore, there is an urgent need for a safety protection device with a simple structure, convenient operation, and excellent protective effect. Summary of the Invention

[0004] In view of this, the present invention provides a converter fire door protection device and a steelmaking equipment, which solve the problems of large safety hazards, poor protective effect, and inconvenient operation during the cleaning process of the front furnace fire door track, ensuring the safety of operators while maintaining the normal opening and closing of the fire door.

[0005] Based on the above purpose, on the one hand, an embodiment of the present invention provides a converter fire door protection device, which is applicable to a first fire door and a second fire door that are opened and closed by moving towards and away from each other. The protection device specifically includes: A fixed pulley group, which is installed outside the first fire door; A winch, which includes a main body and a driving structure. The main body is installed outside the second fire door, and the driving structure is arranged outside the main body; A steel rope, which is wound around the inner cavity of the main body; Wherein, the steel rope includes a fixed end and a traction end. The fixed end is connected to the inner cavity of the main body, and the traction end is released from the inner cavity of the main body towards the direction of the fixed pulley group under the action of the driving structure, passes through the fixed pulley group, and then returns to the outside of the second fire door for fixation to form a double-layer steel rope protection net.

[0006] In some embodiments, the steel rope includes a traction direction and a recovery direction. In the traction direction, the traction end releases the steel rope outward from the inner cavity of the main body and passes through the fixed pulley group to reach the second fire door. In the recovery direction, the traction end retrieves the steel rope from the second fire door towards the fixed pulley group, and after detaching from the fixed pulley group, returns to the inner cavity of the main body.

[0007] In some embodiments, it further includes a laser rangefinder. The laser rangefinder is installed on the outer side of the first fire door or the second fire door. The laser rangefinder is used to measure the distance between the first fire door and the second fire door in the state of opening the fire door, and to determine whether the measured distance reaches a preset slag cleaning limit distance.

[0008] In some embodiments, it further includes a fixed buckle arranged on the outer side of the second fire door. The fixed buckle is spaced from the main body by a first preset distance, and the connection line is parallel to the right side edge of the second fire door. The traction end is connected with a hook, and the hook is used to lock with the fixed buckle to fix the traction end to the second fire door.

[0009] In some embodiments, the fixed pulley group includes a first fixed pulley and a second fixed pulley. The first fixed pulley and the second fixed pulley are spaced from each other by a first preset distance, and the connection line is parallel to the left side edge of the first fire door. The combination of the first fixed pulley and the second fixed pulley is used to guide the traction path of the steel rope.

[0010] In some embodiments, the second fixed pulley is arranged at a preset height position on the first fire door and is spaced from the left side edge of the first fire door by a second preset distance. The fixed buckle is arranged at the same height position on the second fire door as the second fixed pulley and is spaced from the right side edge of the second fire door by the second preset distance.

[0011] In some embodiments, the winch further includes a locking device. The locking device is arranged on the outer side of the main body and is used to lock after the steel rope is towed to a taut state to restrict the movement of the steel rope.

[0012] In some embodiments, the driving structure includes a rocker arm, and the rocker arm drives the release or recovery of the traction end by rotation.

[0013] In some embodiments, the fixed pulley group further includes a first fixed pulley support and a second fixed pulley support. The gap between the first fixed pulley support and the inner groove of the first fixed pulley and the gap between the second fixed pulley support and the inner groove of the second fixed pulley are both greater than a third preset distance. The inner groove diameters of the first fixed pulley and the second fixed pulley are both 48 mm, and the outer diameters of the first fixed pulley and the second fixed pulley are both 68 mm.

[0014] On the other hand, an embodiment of the present invention further provides a steelmaking device, including: A converter; Two fire doors, at least one of the two fire doors being capable of moving relative to and towards the other; and The converter fire door protection device as described above.

[0015] The present invention has at least the following beneficial technical effects: The converter fire door protection device has a simple structure and is convenient to install, and does not affect the normal operation of the fire door. Secondly, the double-layer steel rope protection net formed by the converter fire door protection device can effectively prevent accidental falling of personnel and improve the operation safety. Thirdly, compared with the traditional method of manually hanging and removing steel ropes or temporary railings, the automatic traction and locking function of the present protection device greatly reduces the operation complexity and improves the reliability of the protection. In addition, high-strength steel ropes and a stable fixed pulley group are selected for the device to ensure that a good safety protection effect can still be maintained after long-term use. Therefore, the protection system can effectively reduce the safety hazards in the slag cleaning operation and provide a more reliable safety guarantee for the production of the steel mill. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of an embodiment of the converter fire door protection device provided by the present invention; Figure 2 It is a schematic diagram of an embodiment of the winch provided by the present invention.

[0018] Explanation of the reference numerals in the drawings: 1, fixed pulley group; 11, first fixed pulley; 12, second fixed pulley; 21, first fire door; 22, second fire door; 3, winch; 31, main body; 4, steel rope; 5, fixed buckle; 6, hook; 7, locking device; 8, rocker arm; 9, converter. Detailed Description of the Embodiments

[0019] To make the purpose, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0020] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two entities or parameters with the same name but different identities. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.

[0021] For the above purposes, in the first aspect of the embodiments of the present invention, a protection device for a converter fire door is proposed. As Figure 1 shown, the protection device is applicable to a first fire door 21 and a second fire door 22 that open and close by moving towards and away from each other. It mainly includes a fixed pulley set 1, a winch 3, and a steel rope 4. The fixed pulley set 1 is installed outside the first fire door 21; the winch includes a main body 31 and a driving structure. The main body 31 is installed outside the second fire door 22, and the driving structure is arranged outside the main body 31; the steel rope 4 is wound in the inner cavity of the main body 31.

[0022] Among them, the steel rope 4 includes a fixed end and a traction end. The fixed end is connected to the inner cavity of the main body 31. Under the action of the driving structure, the traction end is released from the inner cavity of the main body 31 towards the fixed pulley set 1, passes through the fixed pulley set 1, and then returns to the outside of the second fire door 22 for fixation to form a double-layer steel rope protection net.

[0023] In some embodiments, the protection device for the converter fire door of the present invention is mainly installed between the first fire door 21 and the second fire door 22 in front of the steelmaking converter 9, and is used to form a reliable edge protection barrier when operators perform operations such as slag cleaning. The device forms a double-layer steel rope protection net by the winch 3 pulling the steel rope 4, effectively preventing the operator from falling accidents. Taking Figure 1 as an example, the first fire door 21 is the right fire door in front of the steelmaking converter 9, and the second fire door 22 is the left fire door in front of the steelmaking converter 9. During use, the operator operates the winch 3 to pull the steel rope 4 from the second fire door 22 to the fixed pulley set 1 of the first fire door 21, and after being guided by the fixed pulley set 1, it is pulled back to the second fire door 22 for fixation to form a double-layer steel rope protection net. All components in the protection device for the converter fire door are arranged in the non-high-temperature slag accumulation areas on both sides of the fire doors, avoiding being burned and eroded by the high-temperature splash of molten steel. If necessary, a protective cover can be set for the protection device for the converter fire door.

[0024] A protection device for a converter fire door provided by the present invention can form a reliable horizontal physical isolation during high-risk operations such as slag cleaning in front of the furnace, significantly improving the personal safety protection level of operators. Through the coordinated cooperation of components such as the fixed pulley set 1, the winch 3, and the steel rope 4, the device realizes the rapid traction and stable fixation of the steel rope 4, forms a double-layer protection structure, covers the waist and leg areas of the operator, and effectively prevents personnel from accidentally falling into the furnace front track area.

[0025] In some embodiments, the steel rope 4 includes a traction direction and a recovery direction. In the traction direction, the traction end releases the steel rope 4 outward from the inner cavity of the main body 31 and passes through the fixed pulley set 1 to reach the second fire door 22. In the recovery direction, the traction end recovers the steel rope 4 from the second fire door 22 towards the fixed pulley set 1, and returns to the inner cavity of the main body 31 after detaching from the fixed pulley set 1.

[0026] In some embodiments, the steel rope 4 is a flexible high-strength steel wire rope. Assuming the total weight of the edge workers is 200KG and the safety factor of the steel rope 4 is set to 6 times, then the breaking tensile force required for the steel rope is: 200 * 6 = 1200KG. The length of the steel rope 4 can be selected according to the slag cleaning length of the front-of-furnace fire door track, such as 30 meters. As Figure 2 As shown, the steel rope 4 includes a fixed end and a traction end. The fixed end is connected to the inner cavity reel of the winch, and the traction end is led out from the winch 3 and is equipped with a hook 6. The traction end passes through the fixed pulley set 1 and then returns to the second fire door 22 for fixation to form a double-layer steel rope protection net, covering the edge of the operation area.

[0027] A converter fire door protection device provided by the present invention selects a steel rope with a high safety factor configuration. The high-strength steel rope can withstand a tensile force several times greater than the weight of the personnel, is safe and reliable, meets the requirements of a high-intensity working environment, is applicable to metallurgical working conditions such as high temperature and dust, and has good durability and maintenance convenience.

[0028] In some embodiments, the converter fire door protection device further includes a laser rangefinder. The laser rangefinder is installed on the outer side of the first fire door 21 or the second fire door 22. The laser rangefinder is used to measure the distance between the first fire door 21 and the second fire door 22 in the state of opening the fire door, and to judge whether the measured distance reaches a preset slag cleaning limit distance.

[0029] In some embodiments, it is installed on any one of the fire doors, emits laser to the other fire door, and real-time monitors the distance between the fire doors after opening and closing. After reaching the set preset slag cleaning limit distance (such as 28m), it triggers a prompt or instruction to maintain the distance between the fire doors and tighten the steel rope 4. The laser rangefinder can automatically judge the operation timing, reduce human judgment errors, accurately control the length of the layout area, and control the length of the steel rope 4 pulled out.

[0030] A converter fire door protection device provided by the present invention integrates a laser rangefinder, which is used to real-time monitor the distance between the fire doors, ensure that the front-of-furnace edge operation is always within the set slag cleaning limit range, and avoid risks caused by over-operation. The overall structure of the device is simple, the installation is convenient, the operation is fast, it does not rely on personnel to hang the steel rope or build a temporary guardrail, significantly improves the protection efficiency and safety management level, and has good popularization and application value.

[0031] In some embodiments, the converter fire door protection device further includes a fixing buckle 5 disposed outside the second fire door. The fixing buckle 5 is spaced from the main body 31 by a first preset distance, and the connecting line is parallel to the right side of the second fire door 22. A hook 6 is connected to the traction end, and the hook 6 is used to lock with the fixing buckle 5 to fix the traction end outside the second fire door 22.

[0032] In some embodiments, the fixing buckle 5 is disposed outside the second fire door 22 and includes a fixing base and a hook slot (or snap ring structure). The fixing base is welded to the outside of the second fire door 22, and the hook slot or snap ring structure is used to connect and fix with the hook 6. The fixing buckle 5 is welded and fixed to the second fire door 22. After the hook is inserted into the hook slot or snap ring structure, it is automatically locked under tension to prevent falling off, playing a role in fixing the traction end and maintaining the steel rope tension.

[0033] A converter fire door protection device provided by the present invention realizes quick plugging and unplugging with the steel rope 4 by setting the fixing buckle 5, has a firm lock, ensures that the steel rope 4 does not loosen, and improves the operation efficiency.

[0034] In some embodiments, the fixed pulley group includes a first fixed pulley 11 and a second fixed pulley 12. The first fixed pulley 11 and the second fixed pulley 12 are spaced from each other by a first preset distance, and the connecting line is parallel to the left side of the first fire door 21. The combination of the first fixed pulley 11 and the second fixed pulley 12 is used to guide the traction path of the steel rope 4.

[0035] In some embodiments, the second fixed pulley 12 is disposed at a position of a preset height of the first fire door 21 and is spaced from the left side of the first fire door 21 by a second preset distance. The fixing buckle 5 is disposed at a position of the same height as the second fixed pulley 12 of the second fire door 22 and is spaced from the right side of the second fire door 22 by a second preset distance.

[0036] In some embodiments, the fixed pulley group 1 includes a first fixed pulley 11 and a second fixed pulley 12. Both the first fixed pulley 11 and the second fixed pulley 12 are made of stainless steel and are in a U-shaped, double-bearing structure. As Figure 1 shown, both the first fixed pulley 11 and the second fixed pulley 12 are installed on the first fire door 21 and are located at a position less than 200 mm from the left edge of the first fire door 21. The installation height of the first fixed pulley 11 is 1200 mm, and the installation height of the second fixed pulley 12 is 800 mm. Both the first fixed pulley 11 and the second fixed pulley 12 are required to be welded firmly to ensure that they can withstand a tensile force of 1200 KG, and this tensile force is calculated based on the breaking tensile force of the steel rope.

[0037] In some embodiments, as Figure 1As shown, the distance between the second fixed pulley 12 and the left edge of the first fire-blocking door 21 is less than the second preset distance, and the distance between the fixing buckle 5 and the right edge of the second fire-blocking door 22 is less than the second preset distance. The second preset distance can be set to 200 mm according to the actual application. The installation height of the fixing buckle 5 is coordinated with the arrangement of the second fixed pulley 12, and both are set to a preset height, such as 800 mm, to avoid deviation caused by the oblique pulling of the steel rope 4. The distance between the fixing buckle 5 and the main body 31 is the same as the distance between the first fixed pulley 11 and the second fixed pulley 12, both of which are the first preset distance, such as 400 mm. The above arrangement enables the steel rope outlet of the winch 3 and the first fixed pulley 11 to be installed on a horizontal vertical plane (i.e., a plane perpendicular to the vertical direction of the fire-blocking door), the first fixed pulley 11 and the second fixed pulley 12 to be installed on a longitudinal vertical plane (i.e., a plane parallel to the vertical direction of the fire-blocking door), and the second fixed pulley 12 and the fixing buckle 5 to be installed on a horizontal vertical plane. The two pulleys are arranged up and down to guide the upper and lower layers of the steel rope 4 respectively. The double pulley structure realizes the layout of the upper and lower layers of steel ropes, improves the interception surface, and the layout of the double fixed pulleys, winch 3, and fixed buckle 5 ensures that the steel rope 4 maintains horizontal extension, smooth traction and no deviation after the fire door is opened.

[0038] The present invention provides a converter fire door protection device, in which the fixed pulley is made of high-strength stainless steel material combined with a double bearing design, which is wear-resistant and heat-resistant, suitable for the steel plant environment, and combined with precise installation position setting to ensure smooth steel rope guidance and uniform force. The overall protection system has strong impact resistance and high reliability.

[0039] In some embodiments, Figure 2 As shown, the winch 3 further includes a locking device 7, which is disposed on the outside of the main body 31 and is used to lock the steel rope 4 after it is pulled to a taut state, so as to limit the movement of the steel rope 4.

[0040] A converter fire door protection device provided by the present invention is provided with a winch 3 with a self-locking function. The locking device 7 works synchronously with the inner cavity reel of the main body 31 to achieve automatic locking in the traction and recovery directions of the steel rope 4. When the steel rope 4 in the traction direction is tightened, it is automatically locked to prevent the steel rope from rewinding, thereby avoiding the protective net from loosening or shifting during operation. The self-locking function enhances the protection reliability.

[0041] In some embodiments, Figure 2 As shown, the driving structure includes a rocker arm 8, which drives the release or recovery of the traction end by rotating.

[0042] The present invention provides a converter fire door protection device, in which a rocker arm is installed at a position that is convenient for an operator to directly control the state of a steel rope in a safe area. The rocker arm is connected to a reel in the inner cavity of a main body 31 by a transmission mechanism, and an operator controls the length of the steel rope by shaking the rocker arm, which is easy to operate.

[0043] In some embodiments, the fixed pulley block 1 further includes a first fixed pulley support and a second fixed pulley support. The gap between the first fixed pulley support and the inner groove of the first fixed pulley 11 and the gap between the second fixed pulley support and the inner groove of the second fixed pulley 12 are both greater than a third preset distance. The inner groove diameters of the first fixed pulley 11 and the second fixed pulley 12 are both 48 mm, and the outer diameters of the first fixed pulley 11 and the second fixed pulley 12 are both 68 mm.

[0044] In some embodiments, the pulley support is fixedly welded to the first fire door 21 to bear the tension of the steel rope 4. The gap between each pulley inner groove and the corresponding pulley support is greater than a third preset distance, such as 30 mm.

[0045] In some embodiments, the operation steps of the converter fire door protection device are described as follows: 1) In the state where the fire door is closed, manually shake the rocker arm 8 of the winch 3 to draw out the steel rope 4, so that the steel rope passes through the first fixed pulley 11 and the second fixed pulley 12 in sequence, hang the hook 6 at the traction end of the steel rope 4 on the fixed buckle 5, and continue to manually control the rocker arm 8 of the winch 3 to release all the steel rope; 2) Open the fire door, and use a laser rangefinder to measure whether the first fire door 21 and the second fire door 22 are opened to the preset slag cleaning limit distance to the left and right; 3) When the fire door is opened to the preset slag cleaning limit distance, manually control the rocker arm 8 of the winch 3 to tighten the steel rope 4. In the state where the steel rope 4 is tightened, automatically lock the steel rope 4 through the locking device 7 of the winch 3; 4) A double-layer steel rope protection net is formed, and the edge workers can start operations such as slag cleaning at the edge of the furnace front fire door track.

[0046] Based on the same inventive concept, according to another aspect of the present invention, an embodiment of the present invention further provides a steelmaking device, including: A converter; Two fire doors, at least one of the two fire doors can move relative to and towards the other; and The converter fire door protection device as described above.

[0047] The steelmaking equipment of the present invention is equipped with a protective device that is simple in structure and convenient to install, and will not affect the normal operation of the fire door. Secondly, the double-layer steel rope protective net formed by the protective device can effectively prevent accidental falling of personnel and improve the operation safety. Thirdly, compared with the traditional method of manually hanging and removing steel ropes or temporary railings, the traction and automatic locking function of this protective device greatly reduces the operation complexity and improves the reliability of the protection. In addition, high-strength steel ropes and a stable fixed pulley system are selected for the device to ensure that a good safety protection effect can still be maintained after long-term use. Therefore, this steelmaking equipment can effectively reduce the potential safety hazards in the slag cleaning operation and provide a more reliable safety guarantee for the production of the steel plant.

[0048] The above are exemplary embodiments disclosed by the present invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments disclosed by the present invention as defined by the claims. The functions, steps, and / or actions of the method claims according to the disclosed embodiments herein do not need to be executed in any specific order. The above serial numbers of the disclosed embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments. In addition, although the elements disclosed by the embodiments of the present invention can be described or claimed in an individual form, they can also be understood as multiple unless clearly limited to the singular.

[0049] It should be understood that, as used herein, unless the context clearly supports the exception, the singular form "a" is also intended to include the plural form. It should also be understood that the "and / or" used herein refers to any and all possible combinations including one or more of the associated listed items.

[0050] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the embodiments disclosed by the present invention (including the claims) is limited to these examples; under the idea of the embodiments of the present invention, the technical features between the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A converter fire door protection device, characterized in that, Applicable to a first fire door (21) and a second fire door (22) that open and close by moving towards and away from each other, the protection device includes: A fixed pulley set (1), which is installed outside the first fire door (21); A winch (3), the winch includes a main body (31) and a driving structure, the main body (31) is installed outside the second fire door (22), and the driving structure is arranged outside the main body (31); A steel rope (4), which is wound in the inner cavity of the main body (31); Wherein, the steel rope (4) includes a fixed end and a traction end, the fixed end is connected to the inner cavity of the main body (31), and the traction end is released from the inner cavity of the main body (31) towards the fixed pulley set (1) under the action of the driving structure, passes through the fixed pulley set (1) and then returns to the outside of the second fire door (22) for fixation to form a double-layer steel rope protection net.

2. The converter fire door protection device according to claim 1, characterized in that, The steel rope (4) includes a traction direction and a recovery direction. In the traction direction, the traction end releases the steel rope (4) from the inner cavity of the main body (31) and passes through the fixed pulley set (1) to reach the second fire door (22). In the recovery direction, the traction end recovers the steel rope (4) from the second fire door (22) towards the fixed pulley set (1), and returns to the inner cavity of the main body (31) after detaching from the fixed pulley set (1).

3. The converter fire door protection device according to claim 1, characterized in that, It also includes a laser rangefinder, which is installed outside the first fire door (21) or the second fire door (22). The laser rangefinder is used to measure the distance between the first fire door (21) and the second fire door (22) in the state of opening the fire door, and determine whether the measured distance reaches a preset slag cleaning limit distance.

4. The converter fire door protection device according to claim 1, characterized in that, It also includes a fixed buckle (5) arranged outside the second fire door. The fixed buckle (5) is spaced from the main body (31) by a first preset distance, and the connecting line is parallel to the right side edge of the second fire door (22). The traction end is connected with a hook (6), and the hook (6) is used to lock with the fixed buckle (5) to fix the traction end outside the second fire door (22).

5. The converter fire door protection device according to claim 4, characterized in that, The fixed pulley set includes a first fixed pulley (11) and a second fixed pulley (12). The first fixed pulley (11) and the second fixed pulley (12) are spaced from each other by a first preset distance, and the connecting line is parallel to the left side edge of the first fire door (21). The combination of the first fixed pulley (11) and the second fixed pulley (12) is used to guide the traction path of the steel rope (4).

6. The converter fire door protection device according to claim 5, characterized in that, The second fixed pulley (12) is arranged at a preset height position of the first fire door (21) and is spaced from the left side edge of the first fire door (21) by a second preset distance. The fixed buckle (5) is arranged at the same height position as the second fixed pulley (12) of the second fire door (22) and is spaced from the right side edge of the second fire door (22) by the second preset distance.

7. The converter fire door protection device according to claim 1, characterized in that, The winch (3) further includes a locking device (7), which is arranged outside the main body (31) and is used to lock after the steel rope (4) is towed to a taut state to limit the movement of the steel rope (4).

8. The converter fire door protection device according to claim 2, characterized in that, The driving structure includes a rocker arm (8), and the rocker arm (8) drives the release or recovery of the towing end by rotation.

9. The converter fire door protection device according to claim 5, characterized in that, The fixed pulley set (1) further includes a first fixed pulley support and a second fixed pulley support, and the gaps between the first fixed pulley support and the inner groove of the first fixed pulley (11) and between the second fixed pulley support and the inner groove of the second fixed pulley (12) are both greater than a third preset distance. The inner groove diameters of the first fixed pulley (11) and the second fixed pulley (12) are both 48 mm, and the outer diameters of the first fixed pulley (11) and the second fixed pulley (12) are both 68 mm.

10. A steelmaking device, characterized in that, Comprising: A converter; Two fire doors, at least one of the two fire doors being capable of moving relatively and facing each other with respect to the other; And The converter fire door protection device according to any one of claims 1-9.

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