Oxygen lance anti-falling device capable of being tested on line

Abstract

The invention discloses an oxygen lance anti-falling device capable of online testing, which comprises a self-resetting air cylinder, a movable friction block, a fixed friction block, a tension sensor and a control unit, and is characterized in that a rod cavity of the self-resetting air cylinder is connected with a high-pressure air source through a three-way reversing valve, and a cylinder body is connected with a supporting beam above an oxygen lance lifting trolley; the fixed friction block is fixed on the oxygen lance lifting trolley, the movable friction block is a wedge-shaped body with a narrow upper part and a wide lower part and is positioned in a wedge-shaped gap between the fixed friction block and an oxygen lance rail, the top of the movable friction block is connected with a piston rod of the self-resetting air cylinder, and the tension sensor is connected between a steel wire rope of the winch and the transverse moving trolley. The output end of the tension sensor and the control end of the three-way reversing valve are connected with the control unit. The fault alarm value can be set and modified through the control unit, online testing of the oxygen lance anti-falling device is achieved, an operator is helped to find and process the failure fault of the oxygen lance anti-falling device in time, and the oxygen lance falling accident is avoided.

Description

Technical Field

[0001] This invention relates to an oxygen lance fall prevention device, which can test online whether its fall prevention function has failed, and belongs to the field of metallurgical equipment technology. Background Technology

[0002] Oxygen lance lifting devices generally include a winch, horizontal slide rail, transverse trolley, oxygen lance rail, oxygen lance lifting trolley, and movable pulleys (see the 260-ton converter oxygen lance anti-fall device). Figure 1 The transverse trolley is slidably mounted on a horizontal slide rail and equipped with a travel drive device, allowing it to move along the horizontal slide rail. The winch is mounted on the horizontal slide rail. The oxygen lance track includes a fixed guide rail and a moving guide rail. The fixed guide rail is vertically fixed below the horizontal slide rail, and the moving guide rail is vertically fixed to the moving trolley with its lower end corresponding to the fixed guide rail. The transverse trolley can move along the horizontal slide rail to align the lower end of the moving guide rail with the upper end of the fixed guide rail, or to move the moving guide rail away from the fixed guide rail. The oxygen lance lifting trolley is slidably mounted on the moving and fixed guide rails. The frame of the movable pulley is fixed to the top of the oxygen lance lifting trolley. The wire rope on the winch drum passes over the movable pulley and is fixedly connected to the top beam of the transverse trolley. When the lower end of the moving guide rail is aligned with the upper end of the fixed guide rail, the winch is in the working position. Figure 1 Position A in the diagram is the working position, which can drive the oxygen lance lifting trolley to descend or rise along the moving guide rail and the fixed guide rail. When the moving guide rail leaves the fixed guide rail, the winch is in the waiting position. Figure 1 (Position B in the diagram is the waiting position). The 260-ton converter oxygen lance anti-fall device has two winches, one in the working position and the other in the waiting position.

[0003] With the continuous strengthening of the "life first" safety concept, safety management standards are constantly improving, and the concepts of safety standardization and inherent safety are being reinforced. However, in the case of metallurgical converter production, although the oxygen lance lifting device is equipped with an oxygen lance fall prevention device, the existing oxygen lance fall prevention device cannot be tested online. Affected by various complex factors such as harsh environment, unstable force on the oxygen lance scraper, equipment design defects, and maintenance, the oxygen lance fall prevention device is bound to fail. Due to the lack of online testing capabilities, failure of the oxygen lance fall prevention device cannot be detected in time, leading to frequent oxygen lance fall incidents, and safety assurance is not yet absolutely controllable. Therefore, it is essential to design and develop an oxygen lance fall prevention device that can be tested online. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an oxygen lance anti-fall device that can be tested online, so as to promptly detect and eliminate malfunctions of the oxygen lance anti-fall device, avoid oxygen lance fall accidents, and ensure the smooth operation of converter production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An oxygen lance fall prevention device capable of online testing includes a self-resetting cylinder, a movable friction block, a fixed friction block, a tension sensor, and a control unit. The rodless chamber of the self-resetting cylinder is equipped with a reset spring, and the rod chamber is connected to a high-pressure gas source via a three-way reversing valve. The cylinder body of the self-resetting cylinder is connected to a support beam fixed above the oxygen lance lifting trolley. The fixed friction block is fixed to the oxygen lance lifting trolley. The movable friction block is a wedge-shaped body, narrow at the top and wide at the bottom, located in the wedge-shaped gap between the fixed friction block and the oxygen lance track. The top of the movable friction block is connected to the lower end of the piston rod of the self-resetting cylinder via a connecting rod. The tension sensor is connected between the wire rope of the winch of the oxygen lance lifting device and the transverse trolley. The output end of the tension sensor and the control end of the three-way reversing valve are connected to the control unit.

[0006] The aforementioned oxygen lance fall arrestor that can be tested online also includes an auxiliary fall arrestor mechanism. The auxiliary fall arrestor mechanism includes a transmission lever, a booster spring, a suspension bolt, and a booster bolt. The first end of the transmission lever is rotatably connected to the frame of the movable pulley, the middle part is rotatably connected to a fork-shaped support fixed to the top of the oxygen lance lifting trolley via a horizontal support shaft, and the tail end is rotatably connected to the upper end of the connecting rod and the lower end of the piston rod of the self-resetting cylinder. The upper end of the booster bolt is fixedly connected to the frame of the movable pulley, and the lower end slides through the center holes of the oxygen lance lifting trolley and the booster spring in sequence before being screwed into a limit nut. Two suspension bolts are symmetrically arranged on both sides of the booster bolt. The upper end of each suspension bolt is fixedly connected to the frame of the movable pulley, and the lower end slides through the guide hole on the oxygen lance lifting trolley before being screwed into a limit nut. A gap is left between the frame of the movable pulley and the oxygen lance lifting trolley.

[0007] The aforementioned oxygen lance fall prevention device that can be tested online has a fixed friction block that is fixed to the oxygen lance lifting trolley by a bracket and an adjusting bolt. The bracket is fixed to the side of the oxygen lance lifting trolley, and the adjusting bolt passes through a vertical through hole on the side ear plate of the bracket and is locked by two locking nuts. The fixed friction block is fixed to the lower end of the adjusting bolt.

[0008] The aforementioned oxygen lance fall prevention device that can be tested online has two self-resetting cylinders, connecting rods, fork-type supports, and transmission levers, which are symmetrically arranged on both sides of the frame of the movable pulley.

[0009] The aforementioned oxygen lance fall arrestor that can be tested online includes a metal hose, a seamless steel pipe, a rubber hose, and a spring-loaded drum between the rod chamber of the self-resetting cylinder and the three-way reversing valve. The spring-loaded drum includes a rotary joint, a rubber hose drum, a hollow shaft, a spring, and a base. The base is fixed to the upper part of the transverse trolley. The rubber hose drum is rotatably connected to the base via a bearing. The common spring is installed between the base and the rubber hose drum. The hollow shaft is fixed inside the rubber hose drum and coaxial with it. The seamless steel pipe is fixed to a support beam. One end of the rubber hose is wound around the rubber hose drum and connected to the three-way reversing valve in sequence via the hollow shaft, the rotary joint, and the air pipe. The other end of the rubber hose is connected to the seamless steel pipe. The rod chamber of the self-resetting cylinder is connected to the seamless steel pipe via a metal hose.

[0010] The aforementioned oxygen lance fall prevention device, which can be tested online, has a pressure reducing valve between the high-pressure gas source and the three-way reversing valve.

[0011] The aforementioned oxygen lance fall prevention device that can be tested online includes an industrial computer, an electrical control box, and a PLC. The industrial computer and PLC are installed inside the electrical control box, and the industrial computer and PLC are connected via a communication cable. The output end of the tension sensor and the control end of the three-way reversing valve are connected to the PLC.

[0012] The aforementioned oxygen lance fall prevention device that can be tested online, wherein the three-way reversing valve is a T-type three-way reversing valve.

[0013] This invention enables online testing of the oxygen lance fall prevention device by setting and modifying fault alarm values ​​through the control unit. This helps operators to promptly detect and handle malfunctions of the oxygen lance fall prevention device, ensuring its normal operation and thus preventing oxygen lance fall accidents and improving equipment safety. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the installation of the present invention on the oxygen lance lifting device, wherein... Figure 1 (a) is the front view. Figure 1 (b) is the left view; Figure 2 for Figure 1 (a) is a magnified view of a portion of the image. Figure 3 for Figure 1 (b) is a magnified view of a portion of the image; Figure 4 This is a schematic diagram of the self-resetting cylinder. Figure 5 This is a schematic diagram of the structure of a spring-loaded drum, in which... Figure 5 (a) is the front view. Figure 5 (b) is the left view; Figure 6 This is a schematic diagram of the transmission lever.

[0016] The following are the labels in the diagram: 1. Self-resetting cylinder, 2. Spring-loaded drum, 3. Connecting rod, 4. Adjusting bolt, 5. Connecting pin, 6. Hinged bolt, 7. Moving friction block, 8. Fixed friction block, 9. Bracket, 10. Fork-type support, 11. Trunnion, 12. Moving pulley, 13. Support shaft, 14. Metal hose, 15. Pipe clamp, 16. Support beam, 17. Air pipe, 18. Three-way solenoid valve, 19. Pressure reducing valve, 20. Industrial computer, 21. Electrical control box, 22. PLC, 23. Transmission lever, 24. Rubber hose, 26. Seamless steel pipe, 27. Oxygen lance lifting trolley, 28. Assist spring, 29. Assist bolt, 30. Suspension bolt, 31. Oxygen lance fall arrestor, 32. Winch, 33. Moving guide rail, 34. Fixed guide rail, 35. Steel wire rope, 36. Horizontal slide rail, 37. Transverse trolley; 1-1. Tailstock; 1-2. Tail pin; 1-3. Return spring; 1-4. Cylinder block; 1-5. Air filter; 1-6. Fork head; 1-7. Head pin. 2-1. Rotary joint; 2-2. Hose reel; 2-3. Hollow shaft; 2-4. Spring; 2-5. Base. Detailed Implementation

[0017] This invention provides an oxygen lance fall prevention device that can be tested online. This device not only realizes online testing of the oxygen lance fall prevention device, but also realizes dual mechanical and electrical automation control of the oxygen lance fall prevention device, which greatly improves the safety of the device and solves the problems existing in the background technology.

[0018] See Figures 2-6 The present invention mainly includes a self-resetting cylinder 1, a connecting rod 3, a movable friction block 7, a fixed friction block 8, a tension sensor 25, and a control unit. The rodless chamber of the self-resetting cylinder 1 is provided with a reset spring 1-3, and the rod chamber is connected to a high-pressure gas source through a three-way reversing valve 18. The cylinder body 1-4 of the self-resetting cylinder 1 is connected to a support beam 16 fixed above the oxygen lance lifting trolley 27. The fixed friction block 8 is fixed on the oxygen lance lifting trolley 27. The movable friction block 7 is a wedge-shaped body that is narrow at the top and wide at the bottom, located in the wedge-shaped gap between the fixed friction block 8 and the oxygen lance track. The top of the movable friction block 7 is connected to the lower end of the piston rod of the self-resetting cylinder 1 through the connecting rod 3. When the movable friction block 7 moves up and down, it can be close to the fixed friction block 8 and the oxygen lance track or separate from the fixed friction block 8 and the oxygen lance track. The tension sensor 25 is connected between the wire rope 35 on the drum of the winch 32 of the oxygen lance lifting device and the transverse trolley 37. The output end of the tension sensor 25 and the control end of the three-way reversing valve are connected to the control unit.

[0019] Oxygen lance falls are generally caused by faults such as broken wire rope, broken reducer shaft or teeth, or broken coupling bolts. Under normal circumstances, wire rope 35 bears the weight of the oxygen lance lifting trolley 27, the oxygen lance body, and the movable pulley 12. When there is only one wire rope 35, the measurement value of tension sensor 25 is approximately equal to half the sum of the weights of the oxygen lance lifting trolley 27, the oxygen lance body, and the movable pulley 12. Figure 3 In the process, two steel wire ropes 35 are wound on the drum of the winch 32. Each steel wire rope 35 is connected to the transverse trolley 37 through a tension sensor 25. The two tension sensors 25 and the two steel wire ropes 35 form a four-point suspension through the drum of the winch 32 and the movable pulley 12. The measured value of each tension sensor 25 is approximately equal to 1 / 4 of the sum of the weights of the oxygen lance lifting trolley 27, the oxygen lance body, and the movable pulley 12.

[0020] When the wire rope breaks or other malfunctions cause the oxygen lance to fall, the wire rope 35 no longer bears the weight of the oxygen lance lifting trolley 27, the oxygen lance body, and the movable pulley 12. The measured value of the tension sensor 25 approaches zero. A fault alarm value for the wire rope tension is set appropriately. When the measured value of the tension sensor 25 is greater than the fault alarm value, the three-way reversing valve is de-energized and does not operate, allowing the equipment to run normally. When the measured value of the tension sensor 25 is less than or equal to the fault alarm value, the control unit sends a signal to activate the three-way reversing valve. The piston rod of the self-resetting cylinder 1 retracts and, through the connecting rod 3, moves the moving friction block 7 upward until the gap between it and the fixed friction block 8 and the oxygen lance track (fixed guide rail 36 or moving guide rail 33) is zero, generating a large frictional force. Under the action of the frictional force of the friction block, the oxygen lance lifting trolley 27 and the oxygen lance body are locked together with the oxygen lance track, stopping their descent and preventing a fall accident.

[0021] In the event of an oxygen lance falling, to ensure the oxygen lance fall prevention device can reliably brake the oxygen lance lifting trolley 27, this invention includes an auxiliary fall prevention mechanism between the oxygen lance lifting trolley 27 and the movable pulley 12. This auxiliary fall prevention mechanism includes a trunnion 11, a fork-shaped support 10, a transmission lever 23, a booster spring 28, a suspension bolt 30, and a booster bolt 29. The trunnion 11 is mounted on the side of the frame of the movable pulley 12. The first end of the transmission lever 23 is rotatably connected to the trunnion 11, and the middle part has a central hole and is rotatably connected to the fork-shaped support 10 fixed to the top of the oxygen lance lifting trolley 27 via a horizontal support shaft 13. The tail end of the transmission lever 23 is rotatably connected to the upper end of the connecting rod 3 and the lower end of the piston rod of the self-resetting cylinder 1; the upper end of the assist bolt 29 is fixedly connected to the frame of the movable pulley 12, and the lower end slides through the center holes of the oxygen lance lifting trolley 27 and the assist spring 28 in sequence before being screwed into the limiting nut; two suspension bolts 30 are symmetrically arranged on both sides of the assist bolt 29, the upper end of each suspension bolt 30 is fixedly connected to the frame of the movable pulley 12, and the lower end slides through the guide hole on the oxygen lance lifting trolley 27 before being screwed into the limiting nut; a gap is left between the frame of the movable pulley 12 and the oxygen lance lifting trolley 27. The oxygen lance body and the oxygen lance lifting trolley 27 are suspended from the lower part of the movable pulley 12 by the two suspension bolts 30 and the assist bolt 29.

[0022] Under normal circumstances, the weight of the oxygen lance lifting trolley 27 and the oxygen lance body acts on the frame of the movable pulley 12 through the limiting nut, suspension bolt 30, and assist bolt 29. The gap between the frame of the movable pulley 12 and the oxygen lance lifting trolley 27 reaches its maximum value, and the assist spring 28 is compressed. When the oxygen lance falls, under the elastic force of the assist spring 28, the gap between the frame of the movable pulley 12 and the oxygen lance lifting trolley 27 decreases. The movable pulley 12 presses down on the first end of the transmission lever 23 through the trunnion 11, and the tail end of the transmission lever 23 is lifted up and drives the movable friction block 7 to move upward through the connecting rod 3 until the gap with the fixed friction block 8 and the oxygen lance track is zero, thus playing an auxiliary braking role.

[0023] The lower end hole of the connecting rod 3 is connected to the top of the movable friction block 7 via the connecting pin 5 and the hinge bolt 6. The hinge bolt 6 suspends the movable friction block 7 between the fixed friction block 8 and the oxygen lance guide rail. The fixed friction block 8 is fixed to the oxygen lance lifting trolley 27 via the bracket 9 and the adjusting bolt 4. The bracket 9 is fixed to the side of the oxygen lance lifting trolley 27. The adjusting bolt 4 passes through the vertical through hole on the side ear plate of the bracket 9 and is locked by two locking nuts. The fixed friction block 8 is fixed to the lower end of the adjusting bolt 4. The height of the fixed friction block 8 can be adjusted by adjusting the bolt 4 and the matching locking nut.

[0024] Two self-resetting cylinders 1, connecting rods 3, trunnions 11, fork-shaped supports 10, and transmission levers 23 are each provided, and they are symmetrically arranged on both sides of the frame of the movable pulley 12.

[0025] The support beam 16 is fixed above the oxygen lance lifting trolley 27 in a gantry shape. The upper part of the tailstock 1-1 of the two self-resetting cylinders 1 is welded to both ends of the support beam 16, and the lower fork head 1-6 is rotatably connected to the transmission lever 23 through a connecting pin.

[0026] See Figure 3 and Figure 5 A metal hose 14, a seamless steel pipe 26, a rubber hose 24, and a spring-type drum 2 are provided between the rod chamber of the self-resetting cylinder 1 and the three-way reversing valve 18. A pressure reducing valve 19 is provided between the high-pressure air source and the three-way reversing valve 18. The spring-type drum 2 is located on the upper part of the transverse trolley 37 and includes a rotary joint 2-1, a rubber hose drum 2-2, a hollow shaft 2-3, a spring 2-4, and a base 2-5. The base 2-5 is fixed on the upper part of the transverse trolley 37. The rubber hose drum 2-2 is rotatably connected to the base 2-5 through a bearing. 2-4 is installed between the base 2-5 and the hose reel 2-2. The hollow shaft 2-3 is fixed inside the hose reel 2-2 and coaxial with it. The seamless steel pipe 26 is fixed on the support beam 16. One end of the hose 24 is wound around the hose reel 2-2 and connected to the three-way reversing valve 18 in sequence through the hollow shaft 2-3, the rotary joint 2-1, and the air pipe 17. The other end of the hose 24 is connected to the seamless steel pipe 26. The rod chambers of the two self-resetting cylinders 1 are connected to the seamless steel pipe 26 through the metal hose 14. The three-way reversing valve 18 is a T-type three-way reversing valve.

[0027] The upper end of the tension sensor 25 is fixed to the bottom of the top beam of the transverse trolley 37 via a fork-shaped connector, and the lower end is connected to the wire rope 35 on the drum of the winch 32.

[0028] The control unit includes an industrial computer 20, an electrical control box 21, and a PLC. The industrial computer 20 and the PLC are installed inside the electrical control box 21. The industrial computer 20 and the PLC are connected via a communication cable. The output terminal of the tension sensor 25 and the control terminal of the three-way reversing valve 18 are connected to the PLC. The industrial computer 20 is used to set the fault alarm value for the wire rope tension, which is lower than the normal tension value of the wire rope. The PLC compares the measured value of the tension sensor 25 with the fault alarm value. If the measured value of the tension sensor 25 is greater than the fault alarm value, no control signal is output to the three-way reversing valve 18, the three-way reversing valve does not operate, and the oxygen lance lifting device operates normally. If the measured value of the tension sensor 25 is less than or equal to the fault alarm value, a control signal is output to the three-way reversing valve 18, the three-way reversing valve is energized and operates, preventing the oxygen lance lifting trolley 27 from descending. When the fall protection device needs to be tested, the industrial computer 20 is also used to set the maintenance mode. In the maintenance mode, the operator manually modifies the fault alarm value through the industrial computer 20 so that the measured value of the tension sensor 25 is less than or equal to the fault alarm value, thereby energizing the three-way reversing valve.

[0029] The online testing method for oxygen lance fall arrestor devices is as follows: Each shift, the operator manually modifies the fault alarm value via the industrial computer 20, ensuring that the measured value of the tension sensor 25 is less than or equal to the fault alarm value. The PLC energizes the three-way solenoid valve 18, and the flow path of compressed air in the high-pressure air source is: pressure reducing valve 19 → T-type three-way solenoid valve 18 → air pipe 17 → rotary joint 2-1 → hollow shaft 2-3 → rubber hose 24 → seamless steel pipe 26 → metal flexible hose 14 → rod chamber of the self-resetting cylinder 1. The piston rod of the self-resetting cylinder 1 retracts, compressing the return spring 1-3, causing the transmission lever 23 to rotate and pull upwards the connecting rod 3, hinge bolt 6, and moving friction block 7 until the gap between the moving friction block 7 and the oxygen lance track is zero, generating a large frictional force that brakes the oxygen lance lifting trolley 27. At this point, the oxygen lance is lowered, and the oxygen lance cannot move. Then, the fault alarm value is restored by the industrial computer 20. The measured value of the tension sensor 25 is greater than the fault alarm value, the three-way solenoid valve 18 is de-energized, and the compressed air in the rod chamber of the self-resetting cylinder 1 flows along the following path under the action of the return spring 1-3 and the gravity of the moving friction block 7: rod chamber of self-resetting cylinder 1 → metal hose 14 → seamless steel pipe 26 → rubber hose 24 → hollow shaft 2-3 → rotary joint 2-1 → air pipe 17 → T-type three-way solenoid valve 18, and finally discharged by the three-way solenoid valve 18. The piston rod of the self-resetting cylinder 1 extends, the transmission lever 23 rotates in the opposite direction, pushing the connecting rod 3, the hinge bolt 6, and the moving friction block 7 to move downwards to reset. The oxygen lance lifting trolley 27 is restored to its free state, and the test is completed.

[0030] The working process of the oxygen lance fall arrestor is as follows: When the wire rope breaks or other malfunctions cause the oxygen lance to fall, the movable pulley 12 and the oxygen lance lifting trolley 27 lose their upward tension and fall freely under their own weight. The measured value of the tension sensor 25 drops rapidly to the fault alarm value, the three-way solenoid valve 18 is energized, the piston rod of the self-resetting cylinder 1 retracts, causing the transmission lever 23 to rotate and pull the connecting rod 3, the hinge bolt 6, and the moving friction block 7 upward until the gap between the moving friction block 7 and the oxygen lance track is zero, generating a large frictional force to brake the oxygen lance lifting trolley 27. At the same time, the elastic force of the assist spring 28 reduces the distance between the movable pulley 12 and the oxygen lance lifting trolley 27, accelerates the rotation of the transmission lever 23, increases the braking force of the oxygen lance lifting trolley 27, and instantly stops the fall of the oxygen lance lifting trolley 27.

[0031] Because the elastic force of the assist spring 28 and the driving force of the self-resetting cylinder 1 act on the moving friction block 7 at the same time, the oxygen lance lifting trolley 27 can be reliably braked.

[0032] This invention enables online testing of the oxygen lance fall prevention device by setting and modifying fault alarm values ​​through the control unit. This helps operators to promptly detect and address malfunctions in the oxygen lance fall prevention device, ensuring its normal operation and thus preventing oxygen lance fall accidents.

Claims

1. An oxygen lance fall arrestor capable of online testing, characterized in that, The system includes a self-resetting cylinder (1), a moving friction block (7), a fixed friction block (8), a tension sensor (25), and a control unit. The rodless chamber of the self-resetting cylinder (1) is equipped with a reset spring (1-3), and the rod chamber is connected to a high-pressure gas source through a three-way reversing valve (18). The cylinder body (1-4) of the self-resetting cylinder (1) is connected to a support beam (16) fixed above the oxygen lance lifting trolley (27). The fixed friction block (8) is fixed on the oxygen lance lifting trolley (27). The movable friction block (7) is a wedge-shaped body that is narrow at the top and wide at the bottom. It is located in the wedge-shaped gap between the fixed friction block (8) and the oxygen lance track. The top of the movable friction block (7) is connected to the lower end of the piston rod of the self-resetting cylinder (1) through the connecting rod (3). The tension sensor (25) is connected between the wire rope of the winch (32) of the oxygen lance lifting device and the transverse trolley (37). The output end of the tension sensor (25) and the control end of the three-way reversing valve (18) are connected to the control unit.

2. The oxygen lance fall arrestor capable of online testing according to claim 1, characterized in that, It also includes an auxiliary fall protection mechanism, which includes a transmission lever (23), a booster spring (28), a suspension bolt (30), and a booster bolt (29). The first end of the transmission lever (23) is rotatably connected to the frame of the movable pulley (12), the middle part is rotatably connected to the fork-shaped support (10) fixed on the top of the oxygen lance lifting trolley (27) through a horizontal support shaft (13), and the tail end is rotatably connected to the upper end of the connecting rod (3) and the lower end of the piston rod of the self-resetting cylinder (1); the booster bolt (29) The upper end is fixedly connected to the frame of the movable pulley (12), and the lower end slides through the center hole of the oxygen lance lifting trolley (27) and the assist spring (28) and then screws in the limiting nut. Two suspension bolts (30) are symmetrically arranged on both sides of the assist bolt (29). The upper end of each suspension bolt (30) is fixedly connected to the frame of the movable pulley (12), and the lower end slides through the guide hole on the oxygen lance lifting trolley (27) and then screws in the limiting nut. There is a gap between the frame of the movable pulley (12) and the oxygen lance lifting trolley (27).

3. The oxygen lance fall arrestor capable of online testing according to claim 2, characterized in that, The fixed friction block (8) is fixed on the oxygen lance lifting trolley (27) by the bracket (9) and the adjusting bolt (4). The bracket (9) is fixed on the side of the oxygen lance lifting trolley (27). The adjusting bolt (4) passes through the vertical through hole on the ear plate on the side of the bracket (9) and is locked by two locking nuts. The fixed friction block (8) is fixed at the lower end of the adjusting bolt (4).

4. The oxygen lance fall arrestor capable of online testing according to claim 3, characterized in that, Two of each of the self-resetting cylinder (1), connecting rod (3), fork-shaped support (10), and transmission lever (23) are provided, and they are symmetrically arranged on both sides of the frame of the movable pulley (12).

5. An oxygen lance fall arrestor capable of online testing according to any one of claims 1-4, characterized in that, The self-resetting cylinder (1) has a metal hose (14), a seamless steel pipe (26), a rubber hose (24), and a spring-type drum (2) between its rod chamber and the three-way reversing valve (18). The spring-type drum (2) includes a rotary joint (2-1), a rubber hose drum (2-2), a hollow shaft (2-3), a spring (2-4), and a base (2-5). The base (2-5) is fixed to the upper part of the transverse trolley (37). The rubber hose drum (2-2) is rotatably connected to the base (2-5) through a bearing. The common spring (2-4) is installed on the base (2-5) and... Between the hose reels (2-2), the hollow shaft (2-3) is fixed inside the hose reel (2-2) and coaxial with the hose reel (2-2). The seamless steel pipe (26) is fixed on the support beam (16). One end of the hose (24) is wound around the hose reel (2-2) and connected to the three-way reversing valve (18) in sequence through the hollow shaft (2-3), the rotary joint (2-1) and the air pipe (17). The other end of the hose (24) is connected to the seamless steel pipe (26). The rod chamber of the self-resetting cylinder (1) is connected to the seamless steel pipe (26) through the metal hose (14).

6. The oxygen lance fall arrestor capable of online testing according to claim 5, characterized in that, A pressure reducing valve (19) is provided between the high-pressure gas source and the three-way reversing valve (18).

7. The oxygen lance fall arrestor capable of online testing according to claim 6, characterized in that, The control unit includes an industrial computer (20), an electrical control box (21), and a PLC. The industrial computer (20) and the PLC are installed inside the electrical control box (21). The industrial computer (20) and the PLC are connected by a communication cable. The output end of the tension sensor (25) and the control end of the three-way reversing valve (18) are connected to the PLC.

8. The oxygen lance fall arrestor capable of online testing according to claim 7, characterized in that, The three-way directional valve (18) is a T-type three-way directional valve.

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