Earlier use of welded brake disc hoist, also need on-site brake pad, only with special equipment brake pads to the scene processing can solve the problem. After the installation of the brake disc is solved, the newest disc brake device is added on the basis of the original brake disc position according to the position of the new brake disc, which can be connected with the original foundation bolt through the transitional brackets; or a new foundation can be poured To fix the disc brake device, the two methods are not long construction cycle. The disc brake device should be used with the hydraulic station. The hydraulic station does not need a special foundation. A complete hydraulic brake system is established as long as it is placed in the proper place and connected to the disc brake device through the pipeline. Some of the old hoist pneumatic system with rope adjustment and safety brake, brake system in the transformation, the pneumatic system for this rope hoist, then the original tune rope cylinder into a hydraulic cylinder, You can get rid of the original huge pneumatic system, replaced with a hydraulic system, the original old hoist was greatly simplified, the transformation effect is very significant. Electronic control part of the transformation will not be discussed in depth here, it is worth mentioning that, if the original elevator to install encoders, the host can now supporting the use of the latest type of electronic control, the effect of the transformation can be completely and now widely used New hoist comparable. The cycle of transformation is one of the most concerned issues for users. The entire transformation cycle should be determined according to the site conditions. The reconstruction workload of the mechanical part is mainly equipped with the bolt hole and the brake gate. As long as the preparation is complete, the universal rocker drill and the brake Disk devices and Other tools are properly prepared, reasonable staffing, 7 ~ 10 days to complete all the transformation work. According to the mine underground drainage pump design and mine drainage engineering supervision work experience, I believe that for the high lift large suction pump station design should pay attention to the following questions. Elevating the occurrence of sudden flooding in the ground floor of the pump room floor with high water inflow, unpredictable occurrence time and large loss caused by the accident. For the protection of the poor alarm facilities, drainage capacity is relatively small suction main drainage pumping station if the drainage is not timely is prone to water level rise faster than the water pump to reduce the speed of the water level, resulting in water pump room, submerged drainage equipment and then submerged Mine major accident. In the past, the design of the contact between the pump room and the roadway of the yard was designed as a camel-head to prevent water from entering the water pump room. However, this is very inconvenient for the pump room excavation construction and the future access to the maintenance equipment, The simplest method is to raise the minimum elevation of the drainage chamber floor + 0.500m (relative to the basic rail surface elevation of the wellhead) to a proper elevation (+ 1.000m is more appropriate) to prolong the rising time of the water level to make the water pump Sufficient time to drain to ensure drainage and mine safety. Cancel suction pipe bottom valve For high-lift high-flow drainage system, sudden water cut off the water pipe will have a downward impact on the water hammer phenomenon, resulting in damage to the drain pipe or equipment, in order to avoid water hammer usually in the pump outlet Pipeline installation of a micro-block slow closing check valve, micro-block slow closing check valve is the use of a short period of time within the drain a small amount of water through the pump from the suction pipe back out to achieve a slow closure of the valve to eliminate water hammer, once added Bottom valve, in the high-pressure water backflow will first cause the end of the valve damage, if the end of the valve is not damaged water hammer will occur. Do not set the end of the valve can reduce the water absorption resistance, reduce the pump motor configuration power, reduce operating expenses. For example, three 200D43 × 7 multi-stage drainage pumps are installed in the underground pumping station of the Xiaochangba lead-zinc mine in Gansu with a flow rate of 288m3 / h and an actual lift of 288m (1138m-850m). After field testing, The motor (355kW 10V motor) reduces the operating current by 2A, if the motor with smaller power (315kW) is configured, it can save 102480kWh per year with 7h pure drain time per day. Equipped with vacuum water diversion equipment Large water pump or working in high altitude Pumps are usually used before the pump to conduct water diversion, but for the installation of micro-resistance slow closing check valve does not have the bottom valve of the underground high-lift drainage system must be equipped with a vacuum pump to carry water. Suggestions for Solving the Problem of Dual-loop Power Supply According to the design specifications, underground main drainage pumping stations require dual-loop power supply. However, it is sometimes uneconomical and unrealistic for mines located in remote mountainous areas. There are three solutions according to the actual situation in the field : The first option is to purchase diesel generators in the power outage to ensure that the pump electricity; the second approach is to expand the water tank volume, the water tank is usually designed volume of normal 8h storage of water, the design specifications of the mine main drainage pump The number of pumps within the station configuration requirements is that the local sewage and the maximum water inflow and normal inflow of large difference between the normal pumping station generally by the 3 sets of the same type of pump configuration, normal water flow when a drainage work in the case of the largest gushing water When 2 pumps work drainage, 1 standby, pump design backup capacity is much larger than the water storage capacity, not supporting each other, the normal power outage in the production of power outages generally do not exceed 24 hours and will be notified in advance, so a corresponding increase Water storage capacity (increase in length, or increase the cross-section) Upon receipt of the power outage to organize drainage (multiple water Simultaneously) exclude water storage memory of water, pouring water into the outage time is stored within the interior space of water storage, drainage pump start after the call back to normal.
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