An oxygen lance anti-falling device

Abstract

The present invention discloses an oxygen lance anti-falling device, which includes a transmission gear, a gas compression mechanism, and a pneumatic brake. The transmission gear meshes with a fixed rack of an oxygen lance lifting trolley and rotates under the drive of its lifting. The transmission gear is connected to the gas compression mechanism and drives the pneumatic brake. The gas compression mechanism compresses air under the drive of the rotation of the transmission gear. The gas compression mechanism is provided with a first air inlet and a first air outlet. The first air outlet communicates with a second air inlet of the pneumatic brake and the atmospheric environment through a pneumatic valve block assembly. When the oxygen lance lifting trolley accelerates downward to drive the transmission gear to accelerate rotation, the flow rate of the air compressed by the gas compression mechanism becomes larger and is discharged from the first air outlet to the second air inlet of the pneumatic brake. The compressed air entering the pneumatic brake drives the pneumatic brake to generate a braking force to stop the transmission gear. The present invention effectively solves the falling problem caused by various problems.

Description

Technical Field

[0001] The present invention relates to the technical field of converter steelmaking in the metallurgical industry, and in particular to an oxygen lance anti-falling device. Background Art

[0002] The converter oxygen lance is one of the main equipment for steelmaking, and its main function is to inject high-pressure oxygen into the molten steel during the smelting of molten steel. Usually, the oxygen lance is installed on an oxygen lance lifting trolley, and the oxygen lance lifting trolley moves along the track. Under the guidance of the track, the oxygen lance lifting trolley drives the oxygen lance to descend to a suitable position in the converter for oxygen blowing. After the smelting is completed, the oxygen lance lifting trolley drives the oxygen lance to rise to a height position that does not affect the rotation and tapping of the converter. During the smelting process, the position of the oxygen lance from the molten steel surface will be dynamically adjusted according to the smelting process requirements.

[0003] Since the oxygen lance works in the converter during oxygen blowing smelting and is not far from the molten steel surface, it is easily affected by the radiation of molten steel and the splashing of high-temperature molten steel. Therefore, most oxygen lances are protected by water cooling. However, when the oxygen lance fails and falls, it will cause the cooling water to enter the converter, resulting in a major safety accident. Therefore, an anti-falling device is installed on the oxygen lance in the prior art. Currently, the triggering mechanism of various anti-falling devices is mostly triggered by the decrease in the wire rope tension. This principle of action cannot work on the fall caused by the failure of the hoist brake. Because when the brake fails, the wire rope drives the drum to rotate in the reverse direction, and due to the rotational inertia of the drum itself, the wire rope tension cannot drop quickly, resulting in the anti-falling device not being able to respond quickly and timely, thus causing a fall; and after the fall, the wire rope cannot return to its initial state, and the oxygen lance cannot rise under the traction of the hoist or crane, affecting the subsequent operations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an oxygen lance anti-falling device to effectively solve the falling problem caused by various problems; and after the anti-falling device acts, the oxygen lance can still rise under the traction of the hoist or crane without affecting the subsequent lance lifting operation.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] An oxygen lance anti-falling device is fixedly arranged on the oxygen lance lifting trolley and includes a transmission gear, a gas compression mechanism and a pneumatic brake. The oxygen lance lifting trolley moves up and down along a fixed rack. The transmission gear meshes with the fixed rack and rotates under the driving of the lifting of the oxygen lance lifting trolley. The transmission gear is connected to the gas compression mechanism and drives the pneumatic brake. The gas compression mechanism compresses air under the driving of the rotation of the transmission gear. The rotation speed of the transmission gear is positively correlated with the flow rate of the compressed air of the gas compression mechanism. The gas compression mechanism is provided with a first air inlet and a first air outlet. The first air outlet communicates with the second air inlet of the pneumatic brake and the external environment through a pneumatic valve block assembly. The oxygen lance lifting trolley moves up and down at a uniform speed to drive the transmission gear to rotate at a uniform speed. The gas compression mechanism compresses the flow rate of the air and discharges it from the first air outlet to the atmospheric environment. The oxygen lance lifting trolley accelerates downward to drive the transmission gear to rotate at an accelerated speed. The flow rate of the air compressed by the gas compression mechanism becomes larger and is discharged from the first air outlet to the second air inlet of the pneumatic brake. The compressed air entering the pneumatic brake drives the pneumatic brake to generate a braking force to stop the transmission gear.

[0007] Further, the gas compression mechanism includes a first housing, a main shaft rotor and a gas compression component. The main shaft rotor and the gas compression component are sealed in the first housing. The first housing is provided with a first air inlet and a first air outlet. The main shaft rotor penetrates the first housing. One end of the main shaft rotor is connected to the transmission gear, and the other end is connected to the pneumatic brake. The main shaft rotor rotates in the first housing under the driving of the rotation of the transmission gear and drives the gas compression component to suck air from the first air inlet, compress it and discharge it from the first air outlet.

[0008] Further, the gas compression component includes blades. The first housing includes an outer housing and an inner housing. The outer housing, the inner housing and the main shaft rotor are concentrically arranged. The first air inlet and the first air outlet are opened on the outer housing. A gas channel is provided between the outer housing and the inner housing to allow air to flow from the first air inlet into the inner housing, and the compressed air is discharged from the first air outlet. The main shaft rotor is symmetrically provided with a plurality of rectangular grooves along the circumferential direction. The number of the blades corresponds to the number of the rectangular grooves and slides in the rectangular grooves. The space between the inner housing and the main shaft rotor is divided into a plurality of chambers by the plurality of blades. The main shaft rotor rotates synchronously under the driving of the rotation of the transmission gear. The blades are thrown towards the inner housing under the action of centrifugal force, and the rotation of the main shaft rotor drives the change of the chambers to compress the air and discharge it from the first air outlet. The oxygen lance lifting trolley accelerates downward, driving the rotation speed of the main shaft rotor to become faster, so that the flow rate of the compressed air discharged from the first air outlet becomes larger.

[0009] Furthermore, the outer housing is of a cylindrical structure, and the outer contour of the inner housing is circular while the inner contour is elliptical, so that the areas of the multiple chambers divided by the rectangular grooves and the blades of the main shaft rotor are different; high-pressure air outlets and normal-pressure air inlets leading to the outer contour are provided on the inner contour surface of the inner housing, and the gas passage includes a first passage communicating from the high-pressure air outlet to the first air inlet and a second passage communicating from the normal-pressure air outlet to the first air inlet.

[0010] Furthermore, the pneumatic valve block assembly includes a check valve, a relief valve, a slide valve, and an adjustable throttle valve; the check valve is located on one side close to the first air outlet and is communicated with the first air outlet, the adjustable throttle valve is located on one side close to the atmospheric environment, the slide valve communicates the second air inlet, the adjustable throttle valve, and the check valve, and both ends of the relief valve are communicated with the adjustable slide valve and the slide valve respectively. When the gas flow rate discharged from the first air outlet of the gas compression mechanism is less than the flow rate value set by the adjustable throttle valve, the compressed air flows out to the atmospheric environment successively through the check valve, the slide valve, and the adjustable throttle valve; when the gas flow rate discharged from the first air outlet of the gas compression mechanism is greater than the flow rate value set by the adjustable throttle valve, under the action of the adjustable throttle valve, the pressure gradually increases until it is greater than the set pressure of the relief valve, and then the relief valve acts to push the slide valve to change direction, and the compressed air flows into the second air inlet.

[0011] Furthermore, the pneumatic brake includes a second housing, a brake disc, brake pads, and a first elastic member. The brake disc is provided on the upper section of the second housing and is connected to the transmission gear and rotates synchronously under the drive of the transmission gear; the brake pads are connected to the second housing through a sealing ring, and a sealed cavity is formed by enclosing the lower end surface of the brake pads and the second housing. The second air inlet is provided on the lower end surface of the second housing, the first elastic member is compressively arranged between the brake pads and the second housing, and a slide bar is further fixedly provided on the lower end surface of the second housing. The brake pads are provided with a chute for the slide bar to pass through; the compressed air enters the sealed cavity through the second air inlet and pushes the brake pads to move upward against the elastic force of the first elastic member to fit with the brake disc. The brake disc stops under the action of the brake pads and the slide bar to drive the transmission gear to stop; and the brake pads move downward under the action of the elastic restoring force of the first elastic member to disengage from the brake disc.

[0012] Furthermore, a check mechanism is provided between the gas compression mechanism and the pneumatic brake. The check mechanism is connected to the main shaft rotor of the gas compression mechanism. When the oxygen lance lifting trolley descends along the fixed rack, driving the transmission gear to rotate forward, the check mechanism does not produce a stopping effect. The transmission gear is transmitted to the brake disc through the main shaft rotor and the check mechanism. When the oxygen lance lifting trolley ascends along the fixed rack, driving the transmission gear to rotate in reverse, the check mechanism acts, and the check mechanism disconnects the connection between the main shaft rotor and the brake disc.

[0013] Furthermore, the check mechanism includes a driving disc, a driven disc, and a driven shaft. The driving disc is connected to the main shaft rotor, the driven disc is connected to the driven shaft, and the driven shaft extends into the pneumatic brake and is connected to the brake disc. Two pawls are symmetrically installed along the circumferential radial direction of the driving disc, and the driven disc is provided with grooves for the pawls to be inserted and matched. When the transmission gear rotates forward, driving the driving disc to rotate forward, the pawls engage with the grooves of the driven disc to drive the driven disc and the driven shaft to rotate synchronously, thereby driving the brake disc to rotate. When the transmission gear rotates in reverse, driving the driving disc to rotate in reverse, the pawls disengage from the grooves of the driven disc to disconnect the connection between the transmission gear and the brake disc.

[0014] Furthermore, the driving disc is of a cylindrical structure, and two stepped holes are symmetrically opened along the circumferential radial direction. The stepped holes are for the pawls to be clamped. A second elastic member is compressed between the two stepped holes, and both ends of the second elastic member are respectively connected to the pawls. The end of the pawl facing the driven disc is a triangular working tooth, and the groove of the driven disc is a triangular groove.

[0015] Furthermore, the gas compression mechanism, the check mechanism, and the pneumatic brake are connected by bolt locking.

[0016] Furthermore, the oxygen lance lifting trolley moves up and down along the trolley track. The trolley track includes two main tracks, the fixed rack is installed on the main tracks, and the fixed rack also meshes with the transmission gear.

[0017] Through the technical solution provided by the present invention, the following beneficial effects are achieved:

[0018] First, through the cooperation of the transmission gear, the gas compression mechanism, and the pneumatic brake, the present invention interlocks the activation of the oxygen lance anti-falling device with the descending speed of the oxygen lance. When the descending speed of the oxygen lance lifting trolley reaches the set value, the oxygen lance anti-falling device takes effect, and the pneumatic brake of the anti-falling device generates a braking force to stop the transmission gear from rotating, so that the transmission gear and the fixed rack are relatively stationary, realizing the stop of the oxygen lance from descending. Secondly, during this descending process, the braking force increases gradually, with little impact, avoiding production accidents caused by the out-of-control fall of the oxygen lance. Finally, when the pneumatic brake of this anti-falling device is locked, the oxygen lance can be lifted by the oxygen lance hoist or the oxygen lance crane in the workshop to a safe position without affecting the subsequent lance lifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the oxygen lance anti-falling device, the oxygen lance lifting trolley, and the trolley track of the present invention;

[0020] Figure 2 is a schematic structural diagram of the oxygen lance anti-falling device and the oxygen lance lifting trolley of the present invention;

[0021] Figure 3 is a schematic structural diagram of the oxygen lance anti-falling device of the present invention;

[0022] Figure 4 is a schematic structural principle diagram of the oxygen lance anti-falling device of the present invention;

[0023] Figure 5 is a schematic structural diagram of the gas compression mechanism of the present invention;

[0024] Figure 6 is a schematic structural diagram of the check mechanism of the present invention;

[0025] Figure 7 is a schematic structural diagram of the pneumatic brake of the present invention.

[0026] Reference Numeral Explanation:

[0027] 10 - oxygen lance anti-falling device, 20 - oxygen lance lifting trolley, 201 - guide wheel, 30 - trolley track, 301 - main track, 302 - support frame, 303 - fixed rack, 304 - lateral guide wheel;

[0028] 1 - Transmission gear, 2 - Gas compression mechanism, 21 - First housing, 22 - Main shaft rotor, 221 - Rectangular groove, 23 - Blade, 211 - First air inlet, 212 - First air outlet, 213 - Outer housing, 214 - Inner housing, 215 - Chamber, 3 - Pneumatic brake, 31 - Second housing, 32 - Brake disc, 33 - Brake pad, 34 - First elastic member, 35 - Sealing ring, 36 - Slide bar, 311 - Second air inlet, 4 - Pneumatic valve block assembly, 41 - Check valve, 42 - Relief valve, 43 - Slide valve, 44 - Adjustable throttle valve, 5 - Check mechanism, 51 - Driving disc, 52 - Driven disc, 53 - Driven shaft, 510 - Pawl, 520 - Groove, 54 - Third housing, 55 - Second elastic member. Detailed implementation manners

[0029] To further illustrate the embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "side", "center", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] Now, the present invention will be further described in conjunction with the accompanying drawings and specific implementation manners.

[0033] Refer to Figures 1 to 7 As shown, as a preferred embodiment of the present invention, a lance anti - falling device 10 is provided and fixedly installed on the lance lifting trolley 20; wherein, the lance lifting trolley 20 moves up and down along the trolley track 30; specifically, refer to Figure 1As shown in the figure, the trolley track 30 includes a main track 301 composed of two H-shaped steels, a support frame 302, and a fixed rack 303. A plurality of support frames 302 are connected between the two main tracks 301 to fix the two main tracks 301. The fixed rack 303 is arranged parallel to the main track 301 and fixedly installed on the support frame 302. The oxygen lance lifting trolley 20 is equipped with four guide wheels 201, and the guide wheels 201 are embedded in the main track 301. The oxygen lance lifting trolley 20 moves up and down along the main track 301. The fixed rack 303 meshes with the transmission gear 1 installed on the oxygen lance anti-falling device 10. Further, the transmission gear 1 of the oxygen lance anti-falling device 10 and the fixed rack 303 are tightly meshed through a lateral guide wheel 304.

[0034] Refer to Figures 3 to 4 As shown in the figure, the oxygen lance anti-falling device 10 includes a transmission gear 1, a gas compression mechanism 2, and a pneumatic brake 3. The transmission gear 1 is connected to the gas compression mechanism 2 and drives the pneumatic brake 3. The gas compression mechanism 2 compresses air under the rotation drive of the transmission gear 1. The rotation speed of the transmission gear 1 is positively correlated with the flow rate of the compressed air of the gas compression mechanism 2. The gas compression mechanism 2 is provided with a first air inlet 211 and a first air outlet 212. The first air outlet 212 communicates with the second air inlet of the pneumatic brake 3 and the atmospheric environment through a pneumatic valve block assembly 4. The oxygen lance lifting trolley 20 lifts and lowers at a uniform speed to drive the transmission gear 1 to rotate at a uniform speed. The gas compression mechanism 2 compresses the flow rate of the air and discharges it from the first air outlet 212 to the atmospheric environment. The oxygen lance lifting trolley 20 accelerates downward to drive the transmission gear 1 to rotate at an accelerated speed. The flow rate of the compressed air of the gas compression mechanism 2 becomes larger and is discharged from the first air outlet 212 to the second air inlet 311 of the pneumatic brake 3. The compressed air entering the pneumatic brake 3 drives the pneumatic brake 3 to generate a braking force to stop at the transmission gear 1. In this embodiment, through the cooperation of the transmission gear 1, the gas compression mechanism 2, and the pneumatic brake 3, the start of the oxygen lance anti-falling device is interlocked with the descending speed of the oxygen lance. When the descending speed of the oxygen lance lifting trolley reaches the set value, the transmission gear 1 rotates at an accelerated speed, driving the flow rate of the compressed gas of the gas compression mechanism 2 to become larger, so as to drive the pneumatic brake 3 to generate a braking force, stopping the rotation of the transmission gear 1, so that the transmission gear 1 and the fixed rack 303 are relatively stationary, realizing the stop of the descent of the oxygen lance. In this way, no matter what reason causes the oxygen lance to fall, the oxygen lance anti-falling device can respond to effectively solve the falling problem caused by various problems.

[0035] Refer to Figure 5As shown, the gas compression mechanism 2 includes a first housing 21, a main shaft rotor 22, and a gas compression assembly. The main shaft rotor 22 and the gas compression assembly are sealed inside the first housing 21. A first air inlet 211 and a first air outlet 212 are provided on the first housing 21. The main shaft rotor 22 penetrates the first housing 21. One end of the main shaft rotor 22 is connected to the transmission gear 1, and the other end is connected to the pneumatic brake 3. Driven by the rotation of the transmission gear 1, the main shaft rotor 22 rotates inside the first housing 21 and drives the gas compression assembly to suck air from the first air inlet 211, compress it, and discharge it from the first air outlet 212. Further, the gas compression assembly includes blades 23. The first housing 21 includes an outer housing 213 and an inner housing 214. The outer housing 213, the inner housing 214, and the main shaft rotor 22 are concentrically arranged. The first air inlet 211 and the first air outlet 212 are provided on the outer housing 213. A gas passage is provided between the outer housing 213 and the inner housing 214 to allow air to flow from the first air inlet 211 into the inner housing 214 and the compressed air to be discharged from the first air outlet 212. The main shaft rotor 22 is symmetrically provided with a plurality of rectangular grooves 221 along the circumferential direction. The number of blades 23 corresponds to the number of rectangular grooves 221 and slides in the rectangular grooves 221. The space between the inner housing 214 and the main shaft rotor 22 is divided into a plurality of chambers 215 by the plurality of rectangular grooves 221 and the blades 23. The main shaft rotor 22 rotates synchronously under the drive of the rotation of the transmission gear 1. The blades 23 are thrown towards the inner housing 214 under the action of centrifugal force, and the rotation of the main shaft rotor 22 causes the chambers 215 to change, so as to compress the air and discharge it from the first air outlet 212. The oxygen lance lifting trolley 20 accelerates and descends, driving the rotational speed of the main shaft rotor 22 to increase, so that the flow rate of the compressed air discharged from the first air outlet 212 becomes larger. <> <>

[0036] In this embodiment, the outer housing 213 has a cylindrical structure. The outer contour of the inner housing 214 is circular, and the outer circle of the inner housing 214 mates with the inner circle of the outer housing 213 and cannot move relative to each other. The inner contour of the inner housing 214 is oval, so that the areas of the multiple chambers 215 divided by the blades 23 are different. Specifically, in this embodiment, a section of the main shaft rotor 22 in the thickness direction of the inner housing 214 is cylindrical, and eight rectangular grooves 221 are evenly distributed along the circumference. Then the blades 23 are rectangular blades, and there are eight of them, which are respectively installed in the rectangular grooves 221 and can slide in the rectangular grooves 221. Then the space between the inner housing 214 and the main shaft rotor 22 with an outer oval contour and an inner circular contour is divided into eight chambers 215 by the blades 23. Among them, high-pressure air outlet holes and normal-pressure air inlet holes leading to the outer contour are provided on the inner contour surface of the inner housing 214. The gas channel provided between the outer housing 213 and the inner housing 214 includes a first channel communicating from the high-pressure air outlet to the first air inlet, and a second channel communicating from the normal-pressure air outlet to the first air inlet. Among them, an air filter is installed at the first air inlet 211.

[0037] The specific operation process of the gas compression mechanism 2 is as follows: When the transmission gear 1 rotates forward under the driving of the lowering of the oxygen lance lifting trolley 20 (it is defined that the rotation direction of the transmission gear 1 when the oxygen lance lifting trolley 20 descends is the forward rotation, and the rotation direction opposite to the forward rotation is the reverse rotation), it drives the main shaft rotor 22 to rotate, so that the blades 23 are thrown towards the inner housing 214 under the action of centrifugal force. The multiple chambers 215 change as the main shaft rotor 22 rotates, so as to pass through the high-pressure air outlet holes and the normal-pressure air inlet holes, so that the air entering the chambers 215 from the air filter at the first air inlet 211 is compressed and discharged from the first air outlet 212. When the oxygen lance falls, the transmission gear 1 drives the main shaft rotor 22 to rotate at an accelerated speed, and the flow rate of the compressed air discharged from the first air outlet 212 becomes larger.

[0038] Refer to Figure 4As shown, the pneumatic valve block assembly 4 includes a check valve 41, a relief valve 42, a slide valve 43, and an adjustable throttle valve 44; the check valve 41 is located on the side close to the first air outlet 212 and is in communication with the first air outlet 212, the adjustable throttle valve 44 is located on the side close to the atmospheric environment, the slide valve 43 is a two-position five-way slide valve, the slide valve 43 communicates with the second air inlet 311, the adjustable throttle valve 44, and the check valve 41, and both ends of the relief valve 42 are respectively in communication with the adjustable throttle valve 44 and the slide valve 43. When the gas flow rate discharged from the first air outlet 212 of the gas compression mechanism 2 is less than the flow rate value set by the adjustable throttle valve 44, the compressed air flows out to the atmospheric environment successively through the check valve 41, the slide valve 43, and the adjustable throttle valve 44; when the gas flow rate discharged from the first air outlet 212 of the gas compression mechanism 2 is greater than the flow rate value set by the adjustable throttle valve 44, under the action of the adjustable throttle valve 44, the pressure gradually increases until it is greater than the set pressure of the relief valve 42, and then the relief valve 42 acts to push the slide valve 43 to change its direction, and the compressed air flows into the second air inlet 311. Among them, the corresponding falling speed and braking distance when this embodiment takes effect can be adjusted by adjusting the adjustable throttle valve 44 and the acting pressure of the set relief valve 42. In this embodiment, through the pneumatic valve block assembly 4, the rotation speed of the transmission gear 1 is associated with the start of the pneumatic brake 3. When the oxygen lance lifting trolley 20 descends at a constant speed, it drives the transmission gear 1 to rotate forward synchronously. Furthermore, when the gas flow rate of the compressed air of the gas compression mechanism 2 is less than the flow rate value set by the adjustable throttle valve 44, the compressed air flows out from the first air outlet 212 to the atmospheric environment, and the pneumatic brake 3 does not act; when the oxygen lance lifting trolley 20 accelerates downward, it drives the transmission gear 1 to accelerate forward rotation. Furthermore, when the gas flow rate of the compressed air of the gas compression mechanism 2 is greater than the flow rate value set by the adjustable throttle valve 44, the pressure gradually increases until it is greater than the set pressure of the relief valve 42, and then the relief valve 42 acts to push the slide valve 43 to change its direction, and the compressed air flows into the second air inlet 311, and then drives the pneumatic brake to act to stop the transmission gear 1.

[0039] In this embodiment, refer to Figure 3 and Figure 4As shown, a check mechanism 5 is further provided between the gas compression mechanism 2 and the pneumatic brake 3. The check mechanism 5 is connected to the main shaft rotor 22 of the gas compression mechanism 2. When the oxygen lance lifting trolley 20 descends along the fixed rack 303 to drive the transmission gear 1 to rotate forward, the check mechanism 5 does not act, and the transmission gear 1 is transmitted to the brake disc 32 of the pneumatic brake 3 (see below) through the main shaft rotor 22 and the check mechanism 5; when the oxygen lance lifting trolley 20 ascends along the fixed rack 303 to drive the transmission gear 1 to rotate reversely, the check mechanism 5 acts, and the check mechanism 5 disconnects the connection between the main shaft rotor 22 and the brake disc 32, so that the brake disc 32 does not affect the reverse rotation of the transmission gear 1. In this embodiment, through the provided check mechanism 5, after the oxygen lance lifting trolley 20 is stopped by the pneumatic brake 3, the connection with the brake disc 32 is disconnected, so that the oxygen lance lifting trolley 20 can be lifted to a safe position under the traction of the oxygen lance hoist or the workshop oxygen lance crane, without affecting the subsequent lance lifting operation.

[0040] In this embodiment, referring to Figure 6As shown in the figure, the check mechanism 5 includes a driving disk 51, a driven disk 52, a driven shaft 53 and a third housing 54. The driving disk 51, the driven disk 52 and the driven shaft 53 are all arranged inside the third housing 54. The driving disk 51 is connected to the main shaft rotor 22, the driven disk 52 is connected to the driven shaft 53, and the driven shaft 53 extends into the pneumatic brake 3 and is connected to the brake disk 32. Two pawls 510 are symmetrically installed on the driving disk 51 along the circumferential radial direction. The driven disk 52 is provided with a groove 520 for the pawl 510 to be inserted and matched. When the transmission gear 1 rotates forward, it drives the driving disk 51 to rotate forward, and the pawl 510 meshes with the groove 520 of the driven disk 52 to drive the driven disk 52 and the driven shaft 53 to rotate synchronously, thereby driving the brake disk 32 to rotate. When the transmission gear 1 rotates reversely, it drives the driving disk 51 to rotate reversely, and the pawl 510 disengages from the groove 520 of the driven disk 52 to disconnect the connection between the transmission gear 1 and the brake disk 32. Specifically, the driving disk 51 is of a cylindrical structure, and two stepped holes 511 are symmetrically arranged along the circumferential radial direction. The stepped holes 511 are used for the pawl 510 to be clamped. A second elastic member 55 is compressively arranged between the two stepped holes 511. The two ends of the second elastic member 55 are respectively connected to the pawl 510. The end of the pawl 510 facing the driven disk 52 is a triangular working tooth, and the groove 520 of the driven disk 52 is a triangular groove. Further, a section of the stepped hole 511 opened on the driving disk 51 near the outer circumference is a rectangular hole, and a section near the axis is a cylindrical hole, and the two cylindrical holes are not connected. The cross-section of the pawl 510 is a polygon, including a rectangular mounting portion that is fitted and clamped on the rectangular hole of the driving disk 51, a triangular pawl working tooth, and a rectangular connecting portion connecting the rectangle and the pawl working tooth. The rectangular mounting portions of the pawl 510 are connected by the second elastic member 55, and the second elastic member 55 is in a compressed state. The driven disk 52 is of a cylindrical shell structure, and two triangular grooves 520 are symmetrically arranged on the inner wall of the driven disk 52 along the inner contour generatrix direction to cooperate with the pawl working teeth of the pawl 510.

[0041] When the oxygen lance lifting trolley 20 is working normally, the oxygen lance lifting trolley 20 descends along the fixed rack 303. When driving the transmission gear 1 to rotate forward, the check mechanism 5 does not produce a stopping effect. The transmission gear 1 drives the main shaft rotor 22, and then drives the driving disk 51. The forward rotation of the driving disk 51 drives the pawl 510 to mesh with the groove 520 of the driven disk 52 to realize the synchronous rotation of the driven disk 52 and the driven shaft 53, and then drive the brake disk 32 of the pneumatic brake 3 to rotate.

[0042] When the oxygen lance lifting trolley 20 is stopped by the pneumatic brake 3 and rises under the traction of the oxygen lance hoist or the workshop oxygen lance crane, the transmission gear 1 rotates reversely, is transmitted to the driving disc 51 through the main shaft rotor 22, and the driving disc 51 rotates reversely, so that the pawl 510 disengages from the groove 520 of the driven disc 52, that is, disengages from the driven disc 52, so as to disconnect the connection between the transmission gear 1 and the brake disc 32. The driven disc 52 and the brake disc 32 do not rotate with the driving disc 51, so that the transmission gear 1 and the main shaft rotor 22 can rotate freely, and thus the lance lifting operation is not affected.

[0043] In this embodiment, referring to Figure 7 As shown, the pneumatic brake 3 includes a second housing 31, a brake disc 32, brake pads 33 and a first elastic member 34. The brake disc 32 is arranged on the upper section of the second housing 31 and is connected to the main shaft rotor 22 through a check mechanism 5, that is, the brake disc 32 is connected to the driven shaft 53 and rotates synchronously under the drive of the main shaft rotor 22; the brake pads 33 are connected to the second housing 31 through a sealing ring 35, and the brake pads 33 and the lower end surface of the second housing 31 enclose a sealed cavity. The second air inlet 311 is arranged on the lower end surface of the second housing 31. The first elastic member 34 is compressively arranged between the brake pads 33 and the second housing 31. A slide rod 36 is fixedly arranged on the lower end surface of the second housing 31, and the brake pads 33 are provided with a chute for the slide rod 36 to pass through; Compressed air enters the sealed cavity through the second air inlet 311 and pushes the brake pads 33 to move upward against the elastic force of the first elastic member 34 to fit with the brake disc 32. Under the action of the brake pads 33 and the slide rod 36, the brake disc 32 stops to drive the main shaft rotor 22 and the transmission gear 1 to stop; then the brake pads 33 move downward under the elastic restoring force of the first elastic member 34 and disengage from the brake disc 32 to reset. Among them, the first elastic member 34 includes a spring and a spring locator. In this embodiment, the compressed air discharged by the gas compression mechanism 2 gradually increases and gradually enters the second air inlet 311 of the pneumatic brake 3, so as to gradually push the brake pads 33 in the pneumatic brake 3 to fit with the brake disc 32, and then realize the stop of the brake disc 32. During this descending process, the braking force increases gradually, with little impact, avoiding production accidents caused by the out-of-control fall of the oxygen lance. Subsequently, by switching the position of the valve core of the slide valve 43, the compressed air can be discharged to the atmospheric environment through the slide valve 43 and the adjustable throttle valve 44, that is, no compressed air is discharged into the second air inlet 311 subsequently, and the brake pads 33 can be reset under the elastic restoring force of the first elastic member 34, separate from the brake disc 32, and return to the initial state.

[0044] In this embodiment, the first housing 21 of the gas compression mechanism 2, the third housing 54 of the check mechanism 5 and the second housing 31 of the pneumatic brake 3 can be connected by bolts, and the pneumatic valve block assembly 4 is installed thereon, so that the above components are integrated into a whole to facilitate installation on the oxygen lance lifting trolley 20.

[0045] The specific operation process of the oxygen lance anti-falling device 10 is as follows:

[0046] When the oxygen lance lifting trolley 20 descends normally and evenly, the transmission gear 1 meshes with the fixed rack 303, the transmission gear 1 rotates forward, driving the main shaft rotor 22 to rotate. At this time, the reverse stop mechanism 5 does not produce a stopping effect. The main shaft rotor 22 drives the driving disc 51 and drives the driven disc 52 to rotate synchronously, and drives the brake disc 32 of the pneumatic brake 3 to rotate at the same speed through the driven shaft 53; at the same time, the rotation of the main shaft rotor 22 drives the gas compression mechanism 2 to act, inhaling air from the first air inlet 211, compressing it and discharging it into the atmospheric environment from the first air outlet 212;

[0047] When an oxygen lance falling accident occurs, the oxygen lance lifting trolley 20 accelerates downward, the transmission gear 1 drives the main shaft rotor 22 to accelerate rotation, so that the flow rate of the compressed air by the gas compression mechanism 2 increases. Under the action of the adjustable throttle valve 44, the pressure gradually increases. When the pressure reaches the pressure value set by the overflow valve 42, the overflow valve 42 opens and pushes the slide valve 43 to change direction. The compressed air enters the pneumatic brake 3 from the second air inlet 311, and the brake pad 33 overcomes the elastic force of the first elastic member 34 and moves upward to fit with the brake disc 32. Under the action of the brake pad 33 and the slide rod 36, the brake disc 32 decelerates and stops, so that the transmission gear 1 stops relative to the fixed rack 303; at this time, the oxygen lance lifting trolley 20 can be lifted upward by the oxygen lance hoist or the workshop crane. During the upward lifting process, the transmission gear 1 rotates reversely, driving the main shaft rotor 22 to rotate reversely, so that the driving disc 51 and the driven disc 52 of the reverse stop mechanism 5 are disconnected, that is, the transmission gear 1 and the brake disc 32 are in a disengaged state, and the transmission gear 1 can rotate freely, so it does not affect the gun lifting operation;

[0048] When the oxygen lance lifting trolley 20 is lifted to the standby position, by operating the slide valve 43, the valve core position of the slide valve 43 is switched, so that the compressed air is discharged into the atmospheric environment through the slide valve 43 and the adjustable throttle valve 44, that is, no compressed air is discharged into the second air inlet 311 subsequently. The brake pad 33 can reset under the elastic restoring force of the first elastic member 34, separate from the brake disc 32, and return to the initial state.

[0049] Although the present invention is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. An oxygen lance anti-falling device, characterized in that: Fixedly installed on the oxygen lance lifting trolley, it includes a transmission gear, a gas compression mechanism and a pneumatic brake. The oxygen lance lifting trolley moves up and down along a fixed rack. The transmission gear meshes with the fixed rack and rotates under the driving of the lifting of the oxygen lance lifting trolley. The transmission gear is connected to the gas compression mechanism and drives the pneumatic brake. The gas compression mechanism compresses air under the driving of the rotation of the transmission gear. The rotation speed of the transmission gear is positively correlated with the flow rate of the compressed air of the gas compression mechanism. The gas compression mechanism is provided with a first air inlet and a first air outlet. The first air outlet communicates with the second air inlet of the pneumatic brake and the external environment through a pneumatic valve block assembly. The oxygen lance lifting trolley rises and falls at a uniform speed to drive the transmission gear to rotate at a uniform speed. The gas compression mechanism compresses the flow rate of air and discharges it from the first air outlet to the atmospheric environment. The oxygen lance lifting trolley accelerates downward to drive the transmission gear to rotate at an accelerated speed. The flow rate of the compressed air compressed by the gas compression mechanism becomes larger and is discharged from the first air outlet to the second air inlet of the pneumatic brake. The compressed air entering the pneumatic brake drives the pneumatic brake to generate braking force to stop the transmission gear. The gas compression mechanism includes a first housing, a main shaft rotor and a gas compression component. The main shaft rotor and the gas compression component are sealed in the first housing. The first housing is provided with a first air inlet and a first air outlet. The main shaft rotor penetrates the first housing. One end of the main shaft rotor is connected to the transmission gear, and the other end is connected to the pneumatic brake. The main shaft rotor rotates in the first housing under the driving of the rotation of the transmission gear and drives the gas compression component to suck air from the first air inlet, compress it and discharge it from the first air outlet.

2. The oxygen lance anti-falling device according to claim 1, characterized in that: The gas compression component includes blades. The first housing includes an outer housing and an inner housing. The outer housing, the inner housing and the main shaft rotor are concentrically arranged. The first air inlet and the first air outlet are opened on the outer housing. A gas passage is provided between the outer housing and the inner housing to allow air to flow from the first air inlet into the inner housing, and the compressed air is discharged from the first air outlet. The main shaft rotor is symmetrically provided with a plurality of rectangular grooves along the circumferential direction. The number of blades corresponds to the number of rectangular grooves and slides in the rectangular grooves. The space between the inner housing and the main shaft rotor is divided into a plurality of chambers by the plurality of blades. The main shaft rotor rotates synchronously under the driving of the rotation of the transmission gear. The blades are thrown towards the inner housing under the action of centrifugal force, and the rotation of the main shaft rotor drives the change of the chambers to compress air and discharge it from the first air outlet. The oxygen lance lifting trolley accelerates downward, driving the rotational speed of the main shaft rotor to increase, so that the flow rate of the compressed air discharged from the first air outlet becomes larger.

3. The oxygen lance anti-falling device according to claim 2, characterized in that: The outer housing is of a cylindrical structure. The outer contour of the inner housing is circular, and the inner contour is elliptical, so that the areas of the multiple chambers divided by the rectangular grooves and the blades of the main shaft rotor are different. High-pressure air outlets and normal-pressure air inlets leading to the outer contour are provided on the inner contour surface of the inner housing. The gas passage includes a first passage communicating from the high-pressure air outlet to the first air inlet, and a second passage communicating from the normal-pressure air outlet to the first air inlet.

4. The oxygen lance anti-falling device according to claim 1, characterized in that: The pneumatic valve block assembly includes a check valve, a relief valve, a slide valve, and an adjustable throttle valve. The check valve is located on the side close to the first air outlet and is communicated with the first air outlet. The adjustable throttle valve is located on the side close to the atmospheric environment. The slide valve communicates with the second air inlet, the adjustable throttle valve, and the check valve. Both ends of the relief valve are communicated with the adjustable throttle valve and the slide valve respectively. When the gas flow discharged from the first air outlet of the gas compression mechanism is less than the flow value set by the adjustable throttle valve, the compressed air flows out to the atmospheric environment successively through the check valve, the slide valve, and the adjustable throttle valve. When the gas flow discharged from the first air outlet of the gas compression mechanism is greater than the flow value set by the adjustable throttle valve, under the action of the adjustable throttle valve, the pressure gradually increases until it is greater than the set pressure of the relief valve, and then the relief valve acts to push the slide valve to change direction, and the compressed air flows into the second air inlet.

5. The oxygen lance anti-falling device according to claim 1, characterized in that: The pneumatic brake includes a second housing, a brake disc, brake pads, and a first elastic member. The brake disc is arranged on the upper section of the second housing and is connected with the transmission gear and rotates synchronously under the drive of the transmission gear. The brake pads are connected with the second housing through a sealing ring, and a closed cavity is formed by enclosing the lower end surface of the brake pads and the second housing. The second air inlet is arranged on the lower end surface of the second housing. The first elastic member is compressively arranged between the brake pads and the second housing. A slide rod is also fixedly arranged on the lower end surface of the second housing, and a chute for the slide rod to pass through is provided on the brake pads. Compressed air enters the closed cavity through the second air inlet and pushes the brake pads to move upward against the elastic force of the first elastic member to fit with the brake disc. The brake disc stops under the action of the brake pads and the slide rod, so as to drive the transmission gear to stop. And the brake pads move downward under the action of the elastic restoring force of the first elastic member and separate from the brake disc.

6. The oxygen lance anti-falling device according to claim 5, characterized in that: A check mechanism is also provided between the gas compression mechanism and the pneumatic brake. The check mechanism is connected with the main shaft rotor of the gas compression mechanism. When the oxygen lance lifting trolley descends along the fixed rack to drive the transmission gear to rotate forward, the check mechanism does not produce a stopping effect, and the transmission gear is transmitted to the brake disc through the main shaft rotor and the check mechanism. When the oxygen lance lifting trolley ascends along the fixed rack to drive the transmission gear to rotate reversely, the check mechanism acts, and the check mechanism disconnects the connection between the main shaft rotor and the brake disc.

7. The oxygen lance anti-falling device according to claim 6, characterized in that: The check mechanism includes a driving disk, a driven disk and a driven shaft. The driving disk is connected to the main shaft rotor, the driven disk is connected to the driven shaft, and the driven shaft extends into the pneumatic brake and is connected to the brake disk. Two pawls are symmetrically installed along the circumferential radial direction of the driving disk, and the driven disk is provided with a groove for the pawls to be inserted and engaged. When the transmission gear rotates forward, it drives the driving disk to rotate forward, and the pawls are engaged with the grooves of the driven disk to drive the driven disk and the driven shaft to rotate synchronously, thereby driving the brake disk to rotate. When the transmission gear rotates in reverse, it drives the driving disk to rotate in reverse, and the pawls are disengaged from the grooves of the driven disk to disconnect the connection between the transmission gear and the brake disk.

8. The oxygen lance anti-falling device according to claim 7, characterized in that: The driving disk is of a cylindrical structure, and two stepped holes are symmetrically opened along the circumferential radial direction. The stepped holes are for the pawls to be clamped. A second elastic member is compressively arranged between the two stepped holes, and the two ends of the second elastic member are respectively connected to the pawls. The end of the pawl facing the driven disk is a triangular working tooth, and the groove of the driven disk is a triangular groove.

9. The oxygen lance anti-falling device according to claim 1, characterized in that: The oxygen lance lifting trolley moves up and down along the trolley track. The trolley track includes two main tracks, and the fixed rack is installed on the main track. The fixed rack is also engaged with the transmission gear.

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