Novel oxygen lance lifting trolley

Abstract

The invention belongs to the technical field of steelmaking equipment, and particularly relates to a novel oxygen lance lifting trolley which comprises a lifting trolley sliding up and down along trolley guide rails, an anti-falling device is arranged on the lifting trolley and comprises a supporting assembly, a brake assembly and a driving assembly are arranged on the supporting assembly, the supporting assembly is fixedly connected with the lifting trolley, a steel wire rope for pulling the lifting trolley to move up and down is installed on the driving assembly, a brake guide rail is fixedly connected to the trolley guide rails, and after the steel wire rope is broken, the driving assembly drives the brake assembly to make close contact with the brake guide rails to brake the lifting trolley. The structure is reasonable, the lifting trolley can be prevented from falling down along the trolley guide rails after the steel wire rope is broken, the oxygen lance is convenient to install, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking equipment, and in particular relates to a novel oxygen lance lifting trolley. Background technique [0002] At present, the oxygen lance mechanism of the domestic converter is in a steady development stage, from the purchase of imported oxygen lance mechanism to self-developed manufacturing, from manual operation to semi-automatic, intelligent automation development, in the process of smelting, the oxygen lance lifting wire rope often breaks and falls. Lance accident, the total weight of the oxygen lance and its accessories is about 5 to 8 tons, and the falling height is 20 meters. After the fall, the oxygen lance is inserted into the bottom of the furnace and immersed in molten steel. It leaks and explodes violently with molten steel, causing immeasurable losses. This is the first; second, the huge impact force of the fall can easily break the high-pressure water pipe and high-pressure oxygen...

AI Technical Summary

Problems solved by technology

[0004] (1) Two sets of steel wire ropes are used, even if one is broken, there is another spare; from the design point of view, it seems very safe, but in the actual production process, due to the high position of the oxygen lance trolley and the large range of activities, it is more difficult to A large amount of smoke and dust generated during the production process makes the oxygen lance trolley a blind spot for monitoring. Many manufacturers use wire rope sensors for monitoring, but the actual effect is not ideal. It can only serve as an after-the-fact alarm, not pre-prevention;

[0005] (2) Use the oxygen lance trolley anti-falling device; the principle is that after the oxygen lance trolley is broken, a wedge iron is inserted between the oxygen lance trolley and the oxygen lance column to prevent the oxygen lance trolley from falling down by using the spring action, and then reach The purpose of the anti-fall gun, but there are great defects in the design. The tightness of the wedge iron plug cannot be controlled and debugged. If it is too tight, it will often jam in the normal smelting process, affecting production. If it is too loose, the It is also impossible to achieve the fall arrest of the oxygen lance trolley, and in the process of steelmaking production, a large amount of metal dust and graphite powder will be produced, which will become the lubricant of the wedge iron of the oxygen lance fall arrest system. In such a harsh environment, if we want to achieve Braking is almost impossible;

[0006] (3) Using the combination of the weight of the oxygen lance trolley and the strong spring, after the steel wire rope breaks, the brake lever is ejected by the force of the spring and stuck on the stopper welded on the track surface in advance to generate resistance, and then the trolley The purpose of stopping the falling, the advantage of this structure is that it can realize fast and stable braking, but at the same time of braking, the falling force of the trolley is all concentrated on the contact point between the brake lever and the stop block. There will be different degrees of wear, open welding and metal fatigue on the moving rod and the stop block, which will easily cause safety hazards

[0007] In addition, in the converter steelmaking operation, the oxygen lance used for blowing is easily damaged due to the harsh working environment. Therefore, in order to ensure product quality and safe production, the oxygen lance needs to be replaced frequently. Usually, when the oxygen lance is installed, the oxygen lance and the medium hose For flange connection, installation and disassembly takes a long time, which affects the operation rate. Therefore, people have developed a quick installation mechanism for the oxygen lance

[0008] The quick installation mechanism of the oxygen lance can quickly replace the oxygen lance, but there is a protruding ring on the outer periphery of the joint body of the multiple medium pipes in this mechanism, which is used to adjust the compensation amount at the medium pipe. Because there are multiple medium pipes on the oxygen lance, Therefore, when adjusting a certain offset at the main body of the oxygen lance, it takes several times more force at the media connection to adjust. Due to the larger diameter of the metal hose, its own weight is heavier, and it will be even heavier after it is filled with water (such as DN300 The weight of the metal hose + water is about 3.4 tons). At this time, the adjustment of the convex ring is quite difficult, and the above weight does not include the downward pressure on the adjustment plate when the seal sleeve and the head joint are docked, so the force of moving the adjustment plate is finally It will be transmitted to the oxygen lance, which is not good for the oxygen lance and will easily cause damage to the oxygen lance

[0009] In the prior art, the adjustment of the oxygen lance at the main body of the oxygen lance is only to process a convex ring at the oxygen lance, and the position of the oxygen lance is adaptively adjusted by the gravity of the oxygen lance. , it will make it very difficult to adjust the oxygen lance

[0010] In this structure, since the adjustment plate can only move horizontally, the head joint can only move horizontally instead of swinging, because the sealing sleeve on the oxygen lance not only has a dimension error in the horizontal direction, but also may have a position error in the angular direction , so the head joint of this structure cannot meet the requirement of swinging at a certain angle to overcome this error

[0011] Converter steelmaking is an important production link in iron and steel enterprises, and the oxygen lance system is one of the key equipment for converter steelmaking. Oxygen lance replacement is generally performed at a height of 40 to 50 meters, with small space, complex equipment, and a difficult working environment. Poor, every time the oxygen lance is replaced, it must be centered and adjusted so that the oxygen lance is vertical and the axis of the oxygen lance coincides with the center line of the converter. Oxygen lances need to be replaced once a day. It usually takes 2 or 3 hours to replace the oxygen lances, which is time-consuming and laborious. The labor cost is high. The replacement time of oxygen lances is long, which delays production efficiency. This is a problem that steel factories have strongly reported.

[0012] Smaller converter oxygen lances are generally fixed by claws. The adjustment of the oxygen lance is realized by adjusting the pad iron under each claw. Each claw is in the same plane, and the oxygen lance tube is perpendicular to the plane. By continuously adjusting each claw The height of the pad iron under the bottom is to make the top of the oxygen lance barrel align with the oxygen lance insertion port of the converter. The distance between the pad iron and the center of the oxygen lance is generally 300-500mm, and the distance between the top of the oxygen lance tube and the adjustment surface is generally about 15m, so the height of the pad iron is slightly higher. Adjustment will cause a large distance offset at the top of the oxygen lance barrel, and the height of the shim can only be adjusted repeatedly based on the experience of the workers. Every time the shim is adjusted, the oxygen lance must be hoisted by a crane, and the position of the oxygen lance will change after it falls. It will have a great impact on the position of the top of the oxygen lance barrel. In addition, the space for workers to operate is small and the operation is inconvenient. After the adjustment, each claw needs to be fixed with bolts. It usually takes 4 workers and half a day to complete the adjustment and fixation. Long time and high labor intensity

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