The importance of monorail cranes in coal mine auxiliary transport

With the rapid development of China's economy, China's coal mining industry has been greatly developed, which led to the rapid development of coal mining related industries

With the rapid development of China's economy, China's coal mining industry has been greatly developed, which led to the rapid development of coal mining related industries, coal mining and coal transport technology has also been greatly improved, but China's coal transport equipment and systems compared with foreign countries there is still a big gap. Among them, the superiority of monorail crane locomotive transportation is gradually reflected, and it has become an indispensable and important auxiliary transportation equipment in modern mine. Therefore, it is of great significance to study the monorail crane.
Overview of 1. monorail crane
Monorail crane, as the name implies, is a kind of hoisting machinery running on a single track. It is composed of track, boom, motor, reducer, brake and other parts. It is mainly used for cargo lifting, handling, loading and unloading operations in large factory buildings, unloading platforms, freight yards, docks and other places.
The following paper describes the application and maintenance of monorail crane in coal transportation in China, and puts forward the relevant measures of monorail crane maintenance, so as to provide a strong basis for better coal mining operations.
It is understood that mechanical and electrical management is the highlight of coal mine production and the key to safe production of coal mine industry. Due to the frequent occurrence of coal mine accidents recently, the safety production of coal mines has been highly valued by many parties. However, the equipment used in the actual production process of coal mines is uneven, resulting in frequent accidents of production machines. It can be said that this is the culprit of coal mine accidents. Until the introduction of monorail crane, monorail crane, as a new equipment machine, is not only convenient to operate and flexible, but also greatly reduces the working efficiency of workers, ensure the safety of workers.
In the daily work of coal mines, the most important thing is the safety of employees. Only under the premise of ensuring the safety of employees can the work be carried out in an orderly manner. But at present, many coal mining enterprises also have many high-tech equipment, but due to poor management, resulting in frequent accidents. The equipment and facilities of some enterprises are not sophisticated enough to ensure the safety of workers. According to statistics, many coal mine accidents are due to poor management of mechanical and electrical equipment and protection devices disrepair and so on. After using the monorail crane transportation equipment, it realizes the long-distance continuous transportation and the handling of the entire heavy frame, and realizes the direct transportation from the bottom of the well to the ground, which greatly reduces the number of workers going down the well and reduces the probability of accidents. However, the use of monorail crane in coal mine mechanical and electrical transportation is slightly unfamiliar, still need to strengthen.
Coal mine auxiliary transportation refers to the coal mine transportation in addition to coal transportation personnel, materials, equipment and rock and other transportation collectively. Coal mine auxiliary transportation can be divided into rail auxiliary transportation and trackless auxiliary transportation. Rail auxiliary transportation is mainly characterized by laying double tracks or suspended monorail, using stringing power, explosion-proof diesel engine, battery and wire rope as traction power, while trackless auxiliary transportation uses rubber wheel or crawler as walking mechanism, using explosion-proof diesel engine and battery as traction power.
Advantages of 2. monorail crane
1. Strong carrying capacity
Monorail crane can make full use of the lifting height because it runs on a single track, and its carrying capacity is much higher than that of ordinary cranes or trolleys. Especially when equipment such as gantry cranes and bridge cranes cannot enter narrow sites, monorail cranes can well meet the requirements of material lifting in factories or warehouses.
2. High flexibility
Because the monorail crane can move flexibly on a single track, it is easy to operate and suitable for the narrow environment of the site. In addition, the monorail crane can be designed according to the work needs and customized according to customer needs, so as to meet the requirements of various working conditions.
3. Easy installation
Compared with other lifting equipment, the installation of monorail crane is very simple, only need to lay the track on the beam frame of the factory or warehouse, and then the boom can be constructed. This installation method saves a lot of on-site construction time and cost, and is convenient for maintenance and replacement in the later period, which is conducive to improving enterprise production efficiency and reducing costs.
The monorail crane is a kind of auxiliary transportation equipment with strong mobility, fast running speed, large load capacity, safe and reliable driving in the suspension monorail system. It is mainly used to transport materials, equipment and personnel in the mining area up and down the mountain and in the working face. In 1985, China successfully developed the first FND-40 explosion-proof diesel monorail crane, filling the domestic gap. Since then, various types of monorail cranes have been developed in China, and monorail cranes have gradually been promoted and applied in coal mines in China. Below, this article will discuss the problems and coping strategies in the use of monorail cranes.
Advantages and disadvantages of monorail crane:
Monorail crane is one of the most widely used transportation equipment in the coal industry so far. As a kind of transportation equipment, monorail crane has both advantages and disadvantages through years of practice. Monorail crane mainly uses high-altitude operation, thus avoiding occupying the working ground and saving a lot of effective space. Moreover, monorail crane is also very convenient for later maintenance, unlike the stationary equipment on the ground, it is very troublesome, time-consuming and labor-consuming to carry and repair goods. The most important thing and the most favored by managers is the safety performance of monorail crane. Monorail crane can be started and stopped at any time. When danger is about to occur, it is good to stop the machine immediately. Monorail crane can load and unload goods anytime and anywhere during its work, because the equipment can realize variable distance operation and accurate positioning of heavy loading and unloading; finally, the monorail crane climbing performance is particularly good, in the face of different angles of the slope, the monorail crane can be easily completed.
Speaking of the advantages, we must pay attention to the shortcomings of monorail crane. Monorail crane belongs to diesel engine monorail crane, which mainly includes diesel engine, hydraulic transmission system and some control systems. As long as the traditional hydraulic system is started, the starting sound of monorail crane can be heard 4 meters away, which will have different noise impact on local residents or staff. In addition, the starting mode of monorail crane diesel engine is to share hand pressure pump, control pump, etc. through gas and liquid, therefore, mistakes will inevitably occur during the operation of workers. Moreover, in the face of deep mining wells, the roadway deformation is relatively large, the transportation route will be correspondingly longer, and the slope will be increased, which directly leads to the management difficulty of monorail crane, the safety factor is relatively reduced, and the requirements for monorail crane will be correspondingly higher.
Improvement measures to prevent locomotive from slipping:
In order to prevent the occurrence of accidents of monorail crane sliding uphill and stop in time during downhill operation, the principle of mechanical friction self-locking can be used, and a self-locking device-reverse transmission bidirectional backstop can be added to the reducer structure to prevent the locomotive from sliding down. When the monorail crane needs to stop running, the star wheel (driven shaft) is used as the main moving part at this time. When rotating clockwise, the roller 2 is wedged in the wedge groove by friction force to form self-locking. As the star wheel continues to rotate, the more locked, the tighter it becomes. Similarly, when the star wheel rotates in the counterclockwise direction, the roller body 4 is pressed to the narrow part of the wedge groove under the action of friction and is wedged tightly to form a self-locking. The reverse transmission bidirectional backstop can form self-locking in clockwise and counterclockwise directions during reverse transmission. In this way, the monorail crane can stop reliably and accurately through the self-locking device in both positive and negative directions.
In order to reduce the weight and structure size of monorail crane, the reverse transmission two-way backstop device is installed on the monorail crane reducer, which greatly improves the safety of monorail crane. It has been used in DXP45 explosion-proof battery monorail crane, and the battery electric traction monorail crane has been put into use.
In view of the above three forms of diesel engine, rope traction and electric traction monorail crane problems in the use of the analysis of the development and development of battery electric traction monorail crane and get used. The electric traction monorail crane uses the storage battery as the power source, uses the quick plug to send the power to the explosion-proof electric cabinet, and then is processed by the four-quadrant inverter in the electric cabinet to invert the direct current provided by the storage battery into three-phase alternating current to drive the traction motor and the oil pump. The power of the traction motor is finally transmitted to the friction driving wheel through the reducer, so that the friction driving wheel and the track friction generate driving force. At the same time, the positive and negative two-way driving and variable frequency stepless speed regulation are realized through the control of the frequency converter. On the other hand, the oil pump motor drives the hydraulic oil pump to work, so that the hydraulic system builds up pressure and provides it to the lifting beam to complete the lifting and lowering of the lifting beam to the material. The pressure oil also applies pressure to the clamping oil cylinder on the driving part of each group of locomotives to ensure that the friction driving wheel gives sufficient clamping force to the lifting rail, so that the friction driving wheel and the lifting rail generate driving force. When the locomotive is on a flat or uphill section, it relies on the battery to provide energy to complete the traction work; when the locomotive is downhill, the gravity potential can make the locomotive generate sliding force, and the sliding force is transmitted to the motor, so that the motor rotation is in the power generation condition. After the electric energy is processed by the four-quadrant inverter in the electric cabinet, the battery is charged to realize energy feedback braking.
There are many different types of explosion-proof battery monorail cranes, such as DX27 and TXD-25 type explosion-proof battery monorail cranes used for poor roadway floor conditions and capable of transporting people and some light auxiliary materials quickly, TXD-7 type explosion-proof battery monorail cranes used for long tunneling distance and fast tunneling roadway transportation, and large fully mechanized mining face, transport machine heavy mechanical equipment DXP40, DX6 and DX80 explosion-proof battery monorail crane.
Application field of 3. monorail crane
Monorail crane is widely used in industry, construction, logistics and other fields, such:
1. Metal processing plants, steel plants and other manufacturing sites, lifting heavy machinery, parts and other items.
2. Warehouse, electronics factory, machinery factory and other places of material lifting, handling operations.
3. Terminals, river ports and other logistics places, import and export goods lifting, transshipment, dock loading and unloading operations.
improved programme of electrical control:
The electric control adopts PLC and frequency converter to realize the control of monorail crane, which has the advantages of wide speed range, high precision, fast response speed and reversible operation of four quadrants. It can more effectively ensure the flexible operation, safety and reliability of the control system, realize the function of running state display and fault alarm, and make the operation of electric traction monorail crane simple, scientific and reasonable.
When the monorail crane is stopped, the operation rights of the two cab are equal. Which cab operates first, which cab obtains the operation right, and the other cab loses the operation right. When the cab that obtains the operation right ends, that is, the monorail crane stops running, and both cab get the same operation opportunity (the cab display allows the operation indicator to be on). When one cab operates the monorail crane, the forward/reverse push rod of the other cab fails, but the emergency stop button and the bugle button can operate normally. In case of emergency, both cab can operate the emergency stop button to stop the monorail crane, or press the reset button to stop the locomotive. When the monorail crane is operated in the cab, the release of the brake and the clamping of the driving wheel are carried out automatically without manual participation.
Specification of monorail crane transportation management:
Due to the wide application of monorail crane in mine operation, to ensure the safety of monorail crane is also to ensure the safety of staff, so it is very important to standardize the transportation of monorail crane. To standardize the transportation management of monorail crane, we should start from two aspects: standardizing mechanical and electrical equipment and strengthening the rules and regulations of transportation management.
Strengthening and lifting the management of transportation equipment is the premise of mine operation. First of all, it is necessary to ensure that the vertical shaft and inclined shaft are equipped with insurance devices, which are mainly used to prevent over-winding devices and over-speed devices. Also install a speed limit device, because when the speed of the winch exceeds 3 meters per second, the machine is on the verge of danger.
Strengthening and improving the rules and regulations of coal mine mechanical and electrical management is the premise to ensure normal operation. The mine should strictly follow the management standards of coal mine mechanical and electrical to strictly require its own mine, and constantly improve the rules and regulations and professional knowledge. The policy of safe production should be conscientiously implemented and implemented to ensure safe production.
Analysis of the application prospect of the improved monorail crane:
The improved battery monorail crane has stable performance, simple operation, few failures, low noise, and low operating costs throughout the year. It truly realizes the economic operation of energy saving and low consumption, and also reflects the modern, environmental protection, and people-oriented design concept.
Battery monorail crane has the characteristics of strong adaptability, wide application range, strong flexibility, large capacity, less personnel, high transportation efficiency, convenient installation and maintenance, and good safety. With the further development of high-power and high-efficiency batteries will be more widely used, and will become the development direction of coal mine auxiliary transportation machinery in the future, which will provide a strong guarantee for the production and construction of modern mines.
4. Summary
As an efficient lifting equipment, monorail crane has the advantages of strong carrying capacity, high flexibility and convenient installation, and is widely used in industry, construction, logistics and other fields. Enterprises need to choose appropriate lifting equipment according to their own production requirements, give full play to their advantages, improve production efficiency, reduce costs, and maximize economic benefits.
The monorail crane is very suitable for the application of fully mechanized excavators, and the facility simplifies the auxiliary transportation facilities to the greatest extent. Improve the efficiency of the application of the maximum degree of simplified auxiliary transport facilities, improve work efficiency. Monorail crane has the ability of difficult operation, so it can be widely used in China's coal transportation industry, but so far it has become an indispensable transportation equipment in coal mine work, but in the face of a more complex external environment, its work pressure is very large, in order to avoid more safety accidents, standardized transportation management, scientific underground operation, and in the work of continuous improvement and optimization of facilities is to ensure the "safe operation, job safety" of the primary premise.