In metallurgical sites, it is necessary to design the work according to the specifications and select the appropriate metallurgical crane to perform the corresponding work. When the rated weight of cranes in metallurgical sites exceeds15t, special metallurgical cranes can be used. For some small metallurgical sites, it is only necessary to start from the technical requirements of electric single-beam crane and adopt double-beam crane, which can achieve good results. It should be noted that in these double-beam bridge cranes, it is necessary not only to strengthen the track load-bearing beam, but also to effectively solve the gap between the clear height at the top of the workshop and the required height of the crane. The comprehensive and effective transformation and optimization of metallurgical crane with narrow overhead space will effectively improve the practical application effect of metallurgical crane, expand its application scope and improve its application level.
1. Classification of metallurgical cranes
Metallurgical crane has a high degree of practical application in metallurgical field, and it needs comprehensive and detailed analysis and research according to its specific situation before it can be reformed and optimized. At present, metallurgical cranes commonly used in metallurgical field are mainly divided into the following two aspects, which are divided according to the process flow: First, the molten iron casting crane is used to lift the molten iron out of the pit in front of the mixer and introduce it into the corresponding converter. In the process of practical application, the crane loaded with molten iron needs the corresponding ladle of the hanger, which is usually carried out under some pit conditions, so the lifting height needs to be large. In addition, the molten iron casting crane itself is often used. During furnace charging, a large amount of dust, mainly high-temperature gas and ferroalloy, will be released inside the converter, which is easily affected by many problems. Therefore, the crane itself needs to have good dustproof, fireproof and heat dissipation characteristics. Second, pour the crane. This crane mainly transports the molten steel in the converter effectively and places it in the continuous casting machine or ingot pit.
2. Formulation of transformation scheme for metallurgical crane
In the process of continuous transformation and optimization of metallurgical cranes, the design and transformation scheme should be actively formulated. The scientific and reasonable transformation scheme itself will directly affect the actual transformation level of metallurgical cranes. First of all, we should start with the mechanism of lifting trolley, including lifting mechanism and translation mechanism, so as to move to the lower temperature side. Usually, these mechanisms will be kept on the same side as the sliding contact line of the metallurgical crane. The structure of the hoisting mechanism is the same as that of the general bridge crane. Both of them take the initiative to play the role of hoisting drum, winding and unwinding the wire rope, and at the same time, under the transmission of the moving crown block, they can hoist the corresponding heavy objects. Choosing a suitable winding method of steel wire rope will effectively improve the horizontal stress effect and keep it in a good state of reverse balance.
3. Characteristic analysis of metallurgical crane transformation scheme
The transformation scheme of metallurgical crane needs to be able to comprehensively analyze the various situations of metallurgical crane, and ensure the scientificity and feasibility of the scheme itself from the specific metallurgical use effect, so as to effectively play the corresponding role and advantages. The transformation scheme of metallurgical crane has many characteristics, mainly concentrated in these aspects: First, the translation mechanism and lifting mechanism in the lifting trolley need to be transferred, usually to the lower temperature side. When they are placed on the end beam platform, the height of the whole crane can be continuously reduced, and at the same time, the self-weight of the lifting trolley can be effectively reduced, so that the section size of the main beam can be effectively controlled and the good purpose of saving steel can be achieved. Secondly, in the transformation scheme of metallurgical crane, some important components and mechanisms can effectively control the influence of thermal radiation on the premise of being far away from the heat source, thus improving the safety and stability to a certain extent. Thirdly, the main stress structure of the metallurgical crane itself has not changed, and the coupling degree between the metallurgical crane structure and the whole machine will effectively meet the working requirements of the metallurgical crane in metallurgical places under the condition of ensuring that the processing technology is carried out in accordance with the specified requirements.
4. Reconstruction scheme of metallurgical crane with narrow top space
At present, in the practical application process, metallurgical cranes need to actively and effectively adapt to the actual situation of the metallurgical site at this stage, so as to meet the production requirements more effectively and provide a good prerequisite for improving the production level of the metallurgical site. At present, metallurgical cranes are faced with many problems in practical application, which need to be actively and properly dealt with. The continuous transformation and optimization of metallurgical crane will effectively improve its use effect. Aiming at the transformation of metallurgical crane with narrow top space, the adopted scheme has obvious innovative advantages, which are mainly reflected in the following aspects:
4. 1 can effectively reduce the running height of the crane itself.
In order to effectively adapt to the narrow top space, metallurgical cranes need to adopt a good transformation scheme, mainly to effectively design and control the crane's own running height. After the transformation, the crane will effectively save the running height, specifically, compared with the running height and the general bridge crane, it can save half; Compared with electric hoist bridge crane, it can effectively save one third of the height range.
4.2 Reasonable design of pulley position of metallurgical crane.
In order to improve the metallurgical crane to adapt to the problem of narrow top space, it is necessary to design the pulley position of metallurgical crane reasonably and effectively. This is mainly to give full play to the inclination of the wire rope, which can play a good anti-shaking effect and has positive significance and role in effectively lifting molten metal. In the process of designing and reforming the internal mechanical part of metallurgical crane, the single limit device can be effectively improved to make it become a double limit in different control circuits, and at the same time, the single-stage braking can be transformed into a two-stage braking form, which can achieve good safety, stability and reliability. In addition, the corresponding lifting limiter is actively added to promote its smooth operation, which will not be affected by the problem of narrow headspace. It should be noted that the pulley rolled by cast steel can play a good running effect.
4.3 It can effectively improve the lifting height of metallurgical cranes.
Lifting the metallurgical crane from the source will reduce the limitation of the narrow headspace and improve the overall application effect of the metallurgical crane. For the transformation and optimization of metallurgical crane, it is necessary to start from the practical application of metallurgical crane and fully consider various use conditions. First of all, the original electric single-beam crane is usually at the bottom of the main beam in the practical application process, mainly because of the existence of electric hoist. Actively increasing the lifting height of metallurgical crane will effectively reduce the influence of the space occupied by hoist bridge crane and effectively improve the lifting height of metallurgical crane.
4.4 Safety protection of metallurgical cranes
In the process of designing the transformation scheme of metallurgical crane, in order to effectively adapt to the problem of narrow top space, it is necessary to do the corresponding safety protection work. First of all, in view of the high motor power, the main hoisting mechanism in metallurgical crane is mainly driven by double motors. When the crane is in normal working condition, the two motors will be able to start and brake at the same time. During the normal operation of metallurgical crane, if one motor fails, the other motor can continue to work for a short time, so it is necessary to carry out corresponding emergency treatment in time to transport the load to some safe areas. Secondly, metallurgical cranes usually rely on the big gear in the reducer to play a role. In the actual work process, if the high-speed shaft of the roller device fails, the other set can continue to drive the roller and also need to land in a safe area, which plays a good protective role.
The transformation of metallurgical crane is an important technical prerequisite for the normal operation of metallurgical site at present, which will effectively affect the effect of metallurgical work. Aiming at the metallurgical crane with narrow overhead space, comprehensive and effective transformation will be able to better adapt to various situations. Actively adopting practical and effective transformation design scheme will improve the overall application level of metallurgical crane. Reasonable design of pulley position of metallurgical crane, active safety protection of metallurgical crane and effective lifting height of metallurgical crane are concrete manifestations of the transformation scheme of metallurgical crane with narrow top space.
This paper introduces the content of "transformation design of metallurgical crane". Welcome to Zhong Da for more information.
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