Oxygen lance anti-falling device

Abstract

The application discloses a centrifugal oxygen lance anti-falling device, which comprises a transmission mechanism and a brake mechanism. The transmission mechanism comprises a driving disc, a passive disc and a linkage assembly. The driving disc is engaged with a fixed rack of an oxygen lance lifting trolley. The linkage assembly is arranged between the driving disc and the passive disc. The linkage assembly is used to drive the driving disc and the passive disc to be connected or disconnected. The brake mechanism is arranged between trolley tracks and engaged with the passive disc. The oxygen lance lifting trolley is lifted at a constant speed. The linkage assembly is not operated. The driving disc is not connected with the passive disc. The oxygen lance lifting trolley is accelerated to descend. The linkage assembly is operated to drive the passive disc and the driving disc to be connected. The passive disc and the driving disc rotate synchronously. The brake mechanism is driven to operate and approach the trolley track to generate a braking effect to stop the oxygen lance lifting trolley. The application effectively solves the falling problem caused by various problems.

Description

Technical Field

[0001] This invention relates to the field of converter steelmaking technology in the metallurgical industry, and in particular to an oxygen lance anti-fall device. Background Technology

[0002] The oxygen lance in a converter is one of the main pieces of equipment in steelmaking. Its primary function is to inject high-pressure oxygen into the molten steel during the smelting process. Typically, the oxygen lance is mounted on a lifting trolley. This trolley moves along a track, guiding the oxygen lance downwards to a suitable position within the converter for oxygen blowing. After smelting, the lifting trolley raises the oxygen lance to a height that does not interfere with the converter's rotation for tapping. During the smelting process, the position of the oxygen lance above the molten steel surface is dynamically adjusted according to the requirements of the smelting process.

[0003] Because oxygen lances operate inside converters during oxygen injection smelting and are close to the molten steel surface, they are easily exposed to radiation and high-temperature molten steel splashes. Therefore, most oxygen lances are water-cooled for protection. However, if an oxygen lance malfunctions and falls, cooling water can enter the converter, causing a major safety accident. Therefore, existing oxygen lances are equipped with fall arrest devices. Currently, most fall arrest devices are triggered by a decrease in wire rope tension. This mechanism is ineffective against falls caused by winch brake failure. When the brake fails, the wire rope causes the drum to rotate in the opposite direction. Due to the drum's rotational inertia, the wire rope tension cannot decrease quickly enough, preventing the fall arrest device from responding promptly and causing the lance to fall. Furthermore, after the fall, the wire rope cannot return to its initial state, preventing the oxygen lance from being raised by the winch or crane, thus affecting subsequent operations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a centrifugal oxygen lance anti-fall device to effectively solve the problem of falling caused by various issues; and after the anti-fall device is activated, the oxygen lance can still be raised under the traction of a winch or crane so as not to affect the subsequent lance lifting operation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A centrifugal oxygen lance fall prevention device, fixedly mounted on an oxygen lance lifting trolley, includes a transmission mechanism and a braking mechanism. The oxygen lance lifting trolley moves up and down along a trolley track, on which a fixed rack is fixedly mounted. The transmission mechanism includes a drive disc, a driven disc, and a linkage component. The drive disc meshes with the fixed rack and rotates synchronously under the lifting drive of the oxygen lance lifting trolley. The linkage component is located between the drive disc and the driven disc, and its operation connects or disconnects the drive disc from the driven disc. The braking mechanism is located between the trolley tracks and meshes with the driven disc. When the oxygen lance lifting trolley moves up and down at a constant speed, the linkage component does not operate, and the drive disc and driven disc are not connected. When the oxygen lance lifting trolley accelerates downward, the linkage component operates, connecting the driven disc to the drive disc. The driven disc and drive disc rotate synchronously, causing the braking mechanism to operate, approaching the trolley track, and generating a braking effect to stop the oxygen lance lifting trolley.

[0007] Furthermore, the linkage component includes a snap-fit ​​part disposed on the drive disk and a snap-fit ​​groove formed on the passive disk. The snap-fit ​​part is rotatable relative to the drive disk. In the initial state, the snap-fit ​​part is separated from the snap-fit ​​groove. When the oxygen lance lifting trolley accelerates its descent and drives the drive disk to rotate at an accelerated speed, the snap-fit ​​part rotates under the action of the centrifugal force of the drive disk, is thrown toward the passive disk, and snaps into the snap-fit ​​groove, so that the passive disk and the drive disk are connected in a transmission manner.

[0008] Furthermore, the engaging portion includes a pawl, a first pin, and a stop. The engaging groove is a ratchet groove that engages with the pawl. The pawl is hinged to the drive disc via the first pin and can rotate around the first pin. The stop consists of two protrusions fixed to the drive disc, respectively located on both sides of the end of the pawl away from the ratchet groove, to limit the rotation range of the pawl. In the initial state, the pawl is separated from the ratchet groove. When the drive disc accelerates its rotation, the pawl rotates around the first pin under the centrifugal force of the drive disc, and the pawl engages in the ratchet groove.

[0009] Furthermore, the engaging portion also includes a first elastic element, which includes a tension spring and a tension spring limiting shaft. The tension spring is fixed to the drive disk via the tension spring limiting shaft and is connected to the pawl. When the drive disk accelerates its rotation, the pawl, under the centrifugal force of the drive disk, overcomes the elastic force of the tension spring and rotates around the first pin to be thrown toward the driven disk and engage with the ratchet groove. Under the restoring force of the tension spring, the pawl reverses its rotation around the first pin to disengage from the ratchet groove.

[0010] Furthermore, there are two locking parts and two locking slots. The two locking parts are symmetrically arranged on both sides of the diameter of the drive disk, and the locking slots are correspondingly arranged on both sides of the diameter of the driven disk, engaging with the locking parts.

[0011] Furthermore, the braking mechanism includes a pull rod and a brake pawl. The brake pawl is located between the trolley tracks, and its middle position is fixed to the oxygen lance lifting trolley via a second pin. One end of the pull rod is hinged to one end of the brake pawl via a third pin. The other end of the pull rod is provided with a rack segment that meshes with the driven disc. The rotation of the driven disc causes the pull rod to move downward, thereby causing the brake pawl to swing around the second pin, so that the other end of the brake pawl presses against the trolley track, thereby generating friction to stop the drive disc and the oxygen lance lifting trolley.

[0012] Furthermore, the brake pawl includes a first brake rod and a second brake rod arranged in a herringbone shape. The connection between the first brake rod and the second brake rod is hinged to the pull rod via a third pin. The first brake rod and the second brake rod each have a pin hole at their middle positions for the second pin to pass through. The lifting and lowering of the pull rod causes the first brake rod and the second brake rod to swing up and down around the second pin, respectively, to move closer to or away from the trolley track.

[0013] Furthermore, the pull rod is also connected to a second elastic element. The rotation of the passive disk drives the pull rod to move downward against the elastic force of the second elastic element, thereby driving the brake pawl to move. When the passive disk stops rotating, the pull rod moves upward under the elastic restoring force of the second elastic element, and drives the brake pawl to return to its initial state.

[0014] Furthermore, the pull rod is provided with sliding sleeves on both the left and right sides, which abut against the pull rod to limit the left and right displacement of the pull rod.

[0015] Furthermore, the oxygen lance lifting trolley moves up and down along the trolley track, which includes two main tracks, and the fixed rack is fixedly mounted on the main tracks.

[0016] The technical solution provided by this invention has the following beneficial effects:

[0017] First, this invention, through the cooperation of a transmission mechanism and a braking mechanism, interlocks the activation of the centrifugal oxygen lance anti-fall device with the descent speed of the oxygen lance lifting trolley. When the descent speed of the oxygen lance lifting trolley reaches the set value of the centrifugal oxygen lance anti-fall device, the device activates, the transmission mechanism drives the braking mechanism, and the braking mechanism actuates, stopping the drive disc from transmission, thus bringing the drive disc and the fixed rack to a standstill, thereby stopping the descent of the oxygen lance lifting trolley. Second, during this descent, the braking force increases gradually, resulting in minimal impact and preventing production accidents caused by the oxygen lance lifting trolley falling out of control. Finally, after stopping, the centrifugal oxygen lance anti-fall device can be raised under the traction of the oxygen lance winch or the workshop oxygen lance crane, lifting the oxygen lance lifting trolley to a safe position without affecting subsequent lance lifting operations. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the centrifugal oxygen lance anti-fall device, the oxygen lance lifting trolley, and the trolley track of the present invention.

[0019] Figure 2 This is a structural schematic diagram of the transmission mechanism of the present invention in the first state;

[0020] Figure 3 This is a schematic diagram of the structure of the transmission mechanism of the present invention in a second state;

[0021] Figure 4 This is a schematic diagram of the braking mechanism of the present invention.

[0022] Label Explanation:

[0023] 10-Centrifugal oxygen lance anti-fall device, 20-Oxygen lance lifting trolley, 201-Guide wheel, 30-Trolley track, 301-Main track, 302-Fixed rack;

[0024] 1-Transmission mechanism, 11-Drive disc, 12-Passive disc, 13-Linkage assembly, 131-Snap-fit ​​part, 1311-Pawl, 1312-First pin, 1313-Stop, 1314-First elastic element, 13141-Tension spring, 13142-Tension spring limiting shaft, 132-Snap-fit ​​groove;

[0025] 2-Brake mechanism, 21-Pull rod, 210-Rack segment, 211-Limiting boss, 22-Brake pawl, 220-Second pin, 221-First brake lever, 222-Second brake lever, 23-Third pin, 24-Second elastic element, 25-Sliding sleeve. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "side", "center", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] See Figures 1 to 4 As shown, in a preferred embodiment of the present invention, a centrifugal oxygen lance fall prevention device 10 is provided, which is fixedly mounted on the oxygen lance lifting trolley 20; wherein, the oxygen lance lifting trolley 20 moves up and down along the trolley track 30; specifically, see [reference needed]. Figure 1 As shown, the trolley track 30 includes two main rails 301 composed of two H-beams, a support frame, and a fixed rack 302. Multiple support frames are connected between the two main rails 301 to fix them. The fixed rack 302 is arranged parallel to the main rails 301 and is fixedly installed on the support frame. The oxygen lance lifting trolley 20 is equipped with four guide wheels 201, which are embedded in the main rails 301. The oxygen lance lifting trolley 20 moves up and down along the main rails 301. The fixed rack 302 meshes with the drive disc 11 (see below) of the centrifugal oxygen lance anti-fall device 10.

[0031] Continue reading Figure 1As shown, the centrifugal oxygen lance fall arrestor 10 includes a transmission mechanism 1 and a braking mechanism 2. The transmission mechanism 1 includes a drive disc 11, a driven disc 12, and a linkage assembly 13. The drive disc 11 meshes with a fixed rack 302 and rotates synchronously under the lifting drive of the oxygen lance lifting trolley 20. The linkage assembly 13 is located between the drive disc 11 and the driven disc 12. The operation of the linkage assembly 13 enables or disconnects the transmission connection between the drive disc 11 and the driven disc 12. The braking mechanism 2 is located between the main rails 301 of the trolley track 30 and meshes with the driven disc 12. When the oxygen lance lifting trolley 20 is lifting at a constant speed, the linkage assembly 13 does not operate, and the drive disc 11 and the driven disc 12 are not connected. When the oxygen lance lifting trolley 20 accelerates downward, the linkage assembly 13 operates, enabling the driven disc 12 to connect with the drive disc 11. The synchronous rotation of the driven disc 12 and the drive disc 11 drives the braking mechanism 2 to operate, approaching the trolley track 30 and generating a braking effect to stop the oxygen lance lifting trolley 20. In this embodiment, the activation of the centrifugal oxygen lance anti-fall device 10 and the descent speed of the oxygen lance lifting trolley 20 are interlocked through the cooperation of the transmission mechanism 1 and the braking mechanism 2. When the descent speed of the oxygen lance lifting trolley 20 reaches the set value of the centrifugal oxygen lance anti-fall device 10, the centrifugal oxygen lance anti-fall device 10 is activated. The transmission mechanism 1 transmits to the braking mechanism 2, and the braking mechanism 2 is activated, approaching the trolley track 30 to generate a braking effect, thereby stopping the descent of the oxygen lance lifting trolley 20.

[0032] Continue reading Figures 1 to 3 As shown, the drive disc 11 and driven disc 12 of the transmission mechanism 1 are mounted on the oxygen lance lifting trolley 20 via pins and can rotate around the pins respectively. The drive disc 11 has a double-layered disc structure. The first layer of the drive disc 11 is a gear that meshes with a fixed rack 302, while the second layer is a disc structure with a cylindrical connecting pin hole in the center for the pin to pass through. The driven disc 12 is a disc structure with a concave center and a convex circumference. A ring of gears is arranged on the outer side of the convex circumference to connect with the rack section 210 of the lever 21 of the braking mechanism 2 (see below). The driven disc 12 also has a cylindrical connecting pin hole in the center for the pin to pass through.

[0033] The linkage component 13 includes a locking part 131 on the drive disk 11 and a locking groove 132 on the passive disk 12. The locking part 131 can rotate relative to the drive disk 11. In the initial state, the locking part 131 is separated from the locking groove 132. When the oxygen lance lifting trolley 20 accelerates down and drives the drive disk 11 to rotate faster, the locking part 131 rotates under the action of the centrifugal force of the drive disk 11, is thrown towards the passive disk 12, and is locked in the locking groove 132, so that the passive disk 12 and the drive disk 11 are connected in transmission. Specifically, the engaging portion 131 includes a pawl 1311, a first pin 1312, a stop 1313, and a first elastic element 1314. The engaging groove 132 is a ratchet groove that engages with the pawl 1311. The pawl 1311 is hinged to the drive disk 11 via the first pin 1312 and can rotate around the first pin 1312. The stop 1313 consists of two protrusions fixed to the drive disk 11, respectively located on both sides of the end of the pawl 1311 away from the ratchet groove, to limit the rotation range of the pawl 1311. The first elastic element 1314 includes a tension spring 13141 and a tension spring limiting shaft 13142. The tension spring 13141 is fixed to the drive disk 11 via the tension spring limiting shaft 13142, and the tension spring 13141 is connected to the pawl 1311. In the first state, pawl 1311 separates from the ratchet groove; when the drive disc 11 accelerates and rotates forward (defined as the direction of rotation of the drive disc 11 when the oxygen lance lifting trolley 20 descends as forward rotation, and the opposite direction of rotation as reverse rotation), pawl 1311, under the centrifugal force of the drive disc 11, overcomes the elastic force of the tension spring 13141, rotates around the first pin 1312, and is thrown towards the driven disc 12, where pawl 1311 is engaged in the ratchet groove; thus realizing the transmission connection between the driven disc 12 and the drive disc 11, the driven disc 12 and the drive disc 11 rotate synchronously; when the drive disc 11 reverses, pawl 1311, under the restoring force of the elastic force of the tension spring 13141, rotates in the opposite direction around the first pin 1312, so that pawl 1311 disengages from the ratchet groove, disconnecting the connection between the driven disc 12 and the drive disc 11.

[0034] In this embodiment, there are two locking parts 131 and two locking grooves 132. The two locking parts 131 are symmetrically arranged on both sides of the diameter of the drive disk 11, and the locking grooves 132 are correspondingly arranged on both sides of the diameter of the driven disk 12, engaging with the locking parts 131. Specifically, the two locking parts 131 are symmetrically arranged at both ends of the diameter of the second layer of the drive disk 11. The pawl 1311 is a strip-shaped structure with triangular teeth at its distal end. The outer peripheral surface cross-section of the central recessed area of ​​the driven disk 12 is mainly composed of four arc segments with two different diameters. One end of the larger arc is tangentially connected to a smaller arc by a straight line, and the other end is connected to another smaller arc by a straight line. The extension of this diameter passes through a circle, thus forming a triangular groove between the smaller arc and the straight line segment. This triangular groove is the locking groove 132. Of course, in other embodiments, the locking parts 131 and locking grooves 132 can have other structures, which are not limited herein.

[0035] In this embodiment, the connection between the drive disc 11 and the driven disc 12 of the transmission mechanism 1 is achieved through the linkage component 13. The linkage component 13 is driven by the speed of the oxygen lance lifting trolley 20's accelerated descent. When the speed of the oxygen lance lifting trolley 20's descent reaches the set value, even if the centrifugal force of the drive disc 11 is large enough to cause the locking part 131 to move and swing towards the driven disc 12, engaging with the locking groove 132, the braking mechanism 2 can be driven to stop the descent of the oxygen lance lifting trolley 20. In this way, the oxygen lance anti-fall device can respond regardless of the cause of the oxygen lance falling, effectively solving the falling problem caused by various issues.

[0036] Continue reading Figures 1 to 4 As shown, the braking mechanism 2 includes a pull rod 21 and a brake pawl 22. The brake pawl 22 is located between the main rails 301 of the trolley track 30. The middle position of the brake pawl 22 is fixed to the oxygen lance lifting trolley 20 by a second pin 220. One end of the pull rod 21 is hinged to one end of the brake pawl 22 by a third pin 23. The other end of the pull rod 21 is provided with a rack segment 210 that meshes with the driven disc 12. The rotation of the driven disc 12 causes the pull rod 21 to move downward, which in turn causes the brake pawl 22 to swing around the second pin 220, so that the other end of the brake pawl 22 presses against the trolley track 30, thereby generating friction to stop the drive disc 11 and the oxygen lance lifting trolley 20. Specifically, the brake pawl 22 includes a first brake rod 221 and a second brake rod 222 arranged in a V-shape. The connection between the first brake rod 221 and the second brake rod 222 is hinged to the pull rod 21 through a third pin 23. The first brake rod 221 and the second brake rod 222 are both provided with pin holes for the second pin 220 to pass through. The lifting and lowering of the pull rod 21 causes the first brake rod 221 and the second brake rod 222 to swing up and down around the second pin 220, so as to move closer to or away from the trolley track 30.

[0037] Furthermore, the pull rod 21 is also connected to a second elastic element 24. When the driven disc 12 rotates, it causes the pull rod 21 to move downward against the elastic force of the second elastic element 24, thereby actuating the brake pawl 22. When the driven disc 12 stops rotating, the pull rod 21 moves upward under the elastic restoring force of the second elastic element 24, and causes the brake pawl 22 to return to its initial state. Specifically, the left and right sides of the pull rod 21 are respectively provided with sliding sleeves 25, which abut against the middle of the pull rod 21 to limit the left and right offset of the pull rod 21, so that the pull rod 21 can only slide up and down. Among them, the pull rod 21 is also provided with a limiting boss 211 above the sliding sleeve 25, and the second elastic element 24 is compressed between the sliding sleeve 25 and the limiting boss 211.

[0038] In this embodiment, when the oxygen lance lifting trolley 20 accelerates downward, the passive disk 12 of the transmission mechanism 1 rotates synchronously with the drive disk 11 through the linkage component 13 (the rotation direction of the drive disk 11 when the oxygen lance lifting trolley 20 descends is defined as forward rotation, and the rotation direction opposite to forward rotation is reverse rotation), thereby driving the pull rod 21 of the braking mechanism 2 to descend. The downward movement of the pull rod 21 causes the brake pawl 22 to press against the trolley track 30 to generate friction. During this descent, the braking force of the braking mechanism 2 increases gradually, with small impact, avoiding production accidents caused by the oxygen lance lifting trolley 20 falling out of control. After the oxygen lance lifting trolley 20 stops, it is lifted upward by the oxygen lance winch or workshop crane. During this upward lifting process, the drive disc 11 reverses so that the locking part 131 of the linkage component 13 separates from the locking groove 132, disconnecting the connection between the drive disc 11 and the passive disc 12, thus not affecting the lifting operation. Furthermore, the pull rod 21 can move upward under the elastic restoring force of the second elastic element 24, causing the brake pawl 22 to separate from the trolley track 30, so that the centrifugal oxygen lance anti-fall device 10 returns to its initial state.

[0039] The specific operation process of this centrifugal oxygen lance fall arrestor 10 is as follows:

[0040] When the oxygen lance lifting trolley 20 descends at a normal and uniform speed, the drive disc 11 of the transmission mechanism 1 meshes with the fixed rack 302, and the drive disc 11 rotates forward. At this time, the linkage component 13 does not move, that is, the pawl 1311 is in the retracted state and does not engage with the locking groove 132. The passive disc 12 and the drive disc 11 are not connected.

[0041] When an oxygen lance falls, the oxygen lance lifting trolley 20 accelerates downward, and the drive disc 11 accelerates rotation. When it reaches the set speed of the centrifugal oxygen lance anti-fall device 10, the pawl 1311 of the linkage component 13, under the action of the centrifugal force of the drive disc 11, overcomes the elastic force of the first elastic element 1314 and is thrown towards the passive disc 12, and engages with the locking groove 132 to achieve synchronous rotation of the passive disc 12 and the drive disc 11. At the same time, the passive disc 12 meshes with the rack segment 210 of the pull rod 21, driving the pull rod 21 to move downward, so that the brake pawl 22 swings upward, pressing the main track 301 of the trolley track 30, generating friction until the oxygen lance lifting trolley 20 is braked to stop.

[0042] At this time, the oxygen lance lifting trolley 20 can be lifted upward by the oxygen lance winch or workshop crane. During the upward lifting process, the drive disc 11 reverses to separate the locking part 131 of the linkage component 13 from the locking groove 132, disconnecting the connection between the drive disc 11 and the passive disc 12, thus not affecting the lifting operation; and the pull rod 21 can move upward under the elastic restoring force of the second elastic element 24, driving the brake pawl 22 to separate from the trolley track 30, so as to realize that the centrifugal oxygen lance anti-fall device 10 returns to the initial state.

[0043] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A centrifugal oxygen lance anti-falling device, characterized in that: The application relates to a fixed device for an oxygen lance lifting trolley, which comprises a transmission mechanism and a brake mechanism, wherein the oxygen lance lifting trolley moves up and down along a trolley track, a fixed rack is fixed on the trolley track, the transmission mechanism comprises a driving disc, a passive disc and a linkage assembly, the driving disc is engaged with the fixed rack and rotates synchronously under the driving of the oxygen lance lifting trolley, the linkage assembly is arranged between the driving disc and the passive disc, the linkage assembly is used to drive the driving disc and the passive disc to be connected or disconnected, the brake mechanism is arranged between the trolley tracks and is engaged with the passive disc, the oxygen lance lifting trolley moves at a constant speed, the linkage assembly is not driven, the driving disc is not connected with the passive disc, the oxygen lance lifting trolley accelerates to descend, the linkage assembly is driven to connect the passive disc and the driving disc, the passive disc rotates synchronously with the driving disc, drives the brake mechanism to move close to the trolley track and stop the oxygen lance lifting trolley. The brake mechanism comprises a pull rod and a brake claw, the brake claw is arranged between the trolley tracks, the middle part of the brake claw is fixed on the oxygen lance lifting trolley through a second pin shaft, one end of the pull rod is hinged with one end of the brake claw through a third pin shaft, the other end of the pull rod is provided with a rack segment which is engaged with the passive disc, the rotation of the passive disc drives the pull rod to move downwards, then drives the brake claw to swing around the second pin shaft, the other end of the brake claw is pressed against the trolley track, thereby generating friction to stop the driving disc and the oxygen lance lifting trolley. The driving disc is a double-layer disc structure, the first layer of the driving disc is a gear which is engaged with the fixed rack, the second layer is a disc structure, a cylindrical connecting pin hole is arranged in the central part of the disc structure to pass through a pin shaft, the passive disc is a disc structure which is concave in the middle and convex in the circumference, a gear is arranged on the outer side of the circumferential convex part to connect with the rack segment of the pull rod of the brake mechanism.

2. The anti-falling device of the centrifugal lance according to claim 1, characterized in that: The linkage assembly comprises a clamping part arranged on the driving disc and a clamping groove arranged on the passive disc, the clamping part can rotate relative to the driving disc. In the initial state, the clamping part is separated from the clamping groove, when the oxygen lance lifting trolley accelerates to descend and drives the driving disc to accelerate, the clamping part rotates under the centrifugal force of the driving disc, swings to the passive disc and is clamped in the clamping groove, so that the passive disc is connected with the driving disc.

3. The centrifugal oxygen lance fall arrest device of claim 2, wherein: The clamping part comprises a pawl, a first pin shaft and a stopper, the clamping groove is a ratchet groove which is matched with the pawl, the pawl is hinged on the driving disc through the first pin shaft and can rotate around the first pin shaft, the stopper is two protrusions which are fixed on the driving disc and are arranged on the two sides of the end of the pawl away from the ratchet groove to limit the rotation range of the pawl, in the initial state, the pawl is separated from the ratchet groove, when the driving disc accelerates to rotate, the pawl rotates around the first pin shaft under the centrifugal force of the driving disc, and the pawl is clamped in the ratchet groove.

4. The centrifugal oxygen lance fall arrest device of claim 3, wherein: The clamping part further comprises a first elastic member, the first elastic member comprises a tension spring and a tension spring limiting shaft, the tension spring is fixed on the driving disc through the tension spring limiting shaft, and the tension spring is connected with the pawl; the driving disc accelerates rotation, the pawl rotates around the first pin shaft under the centrifugal force of the driving disc to throw to the passive disc to clamp with the ratchet groove by overcoming the elastic force of the tension spring; and the pawl reverses around the first pin shaft under the elastic restoring force of the tension spring to make the pawl and the ratchet groove disengage.

5. The centrifugal oxygen lance fall arrest device of claim 2, wherein: The number of the clamping part and the clamping groove is two, the two clamping parts are symmetrically arranged on the two sides of the diameter of the driving disc, and the clamping grooves are correspondingly arranged on the two sides of the diameter of the passive disc and are clamped and matched with the clamping parts.

6. The centrifugal oxygen lance fall arrest device of claim 1, wherein: The brake claw comprises first brake lever and second brake lever arranged in a herringbone shape, the connecting part of the first brake lever and the second brake lever is hinged with the pull rod through a third pin shaft, the middle part of the first brake lever and the second brake lever is provided with a pin hole for the second pin shaft, and the lifting of the pull rod drives the first brake lever and the second brake lever to swing up and down around the second pin shaft to approach or move away from the trolley track.

7. The centrifugal oxygen lance fall arrest device of claim 6, wherein: The pull rod is further connected with a second elastic member, the rotation of the passive disc drives the pull rod to move downward to drive the brake claw to act by overcoming the elastic force of the second elastic member; the passive disc stops rotating, the pull rod moves upward under the elastic restoring force of the second elastic member and drives the brake claw to return to the initial state.

8. The centrifugal oxygen lance fall arrest device of claim 7, wherein: The left and right sides of the pull rod are further respectively provided with a sliding sleeve, the sliding sleeve abuts against the pull rod to limit the left and right deviation of the pull rod.

9. The drop prevention device for a centrifugal lance according to claim 1, characterized in that: The oxygen lance lifting trolley moves up and down along the trolley track, the trolley track comprises two main tracks, and the fixed rack is fixedly arranged on the main track.

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