Large open pit conveyor belt electrical equipment

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Large open pit conveyor belt electrical equipment

Overload) secondary resistance when the Q switch before the control action. This starting method is simple, easy to use, to ensure that the best starting Iq, and keep pre-torque. For particularly long conveyor belt, allowing the torque limit its has a very stringent requirements, but also to avoid the tape vibration, and therefore we should start using more complex control of the acceleration levels of resistance starter here is a function of starting acceleration: the rated load the start of each transport, asked in the 53 ~ 7o seconds. It consists of the -23 * After the decision with the speed and throughput. Braking in the case of special requirements, transport mechanical brake can be used, the DC brake can also be used. Although the mechanical brake is commonly used in drum brakes, but today is used more and more disc brakes, the smell watts through the electro-hydraulic brake booster manipulation. DC brake brakes will not wear the DC current charge into the drag motor, electric motor for a considerable time outside the excited synchronous generator. If the proper control in any load conditions can be DC motor braking torque homeostasis independent of braking and load it within the specified time to stop and have the belt axial vibration and, therefore eliminating the transition point overflow phenomenon of the various drive station drive station is arranged. 4 Drag the first set arranged in transport, 2 arranged in the tail, or spread within the inside of the dump. This device includes drag drag motor, gearbox and brakes. They are mounted on a common drive rack. Which can be placed across the top of the drive roller. Drive the economy in general, from the perspective of drag power, in the belt speed constant, the slip ring motor drag the economy. The main advantages of drive system in the following four aspects: (1) If the appropriate cut off the rotor resistance can be of any desired starting torque and torque curve required limits; In addition, deceleration control can not wear, then motor under external excitation synchronous generator status; (2) the duration of the motor starter temperature had no significant effect, not to mention the motor to be installed inside the protective devices and monitoring devices; (3) compared with the external factors (such as load changes) on the slip ring motor shadow, 24 - sound not;, (4> designed to be simple, easy maintenance. from 1000 sets of equipment collected data show that: the annual high-pressure Levin brown pit damage slip ring motor only 3%. l in the percentage of cracking is the bearing damage. In these statistics, of course, including large bucket wheel excavators and shovel the drive motor, they are most vulnerable to large load of damage. In order to select the economic drag on the most reasonable solution, where it is necessary to discuss the different ways drag, such as coupling with and without starter cage motor drag, DC motor and frequency converter control drag. which have been applied to excavators and disseminate the coupling device would not start dragging away squirrel cage motor Levin Brown Co. in the sixties on the use of several 43o kW squirrel cage motor drag conveyor belt. With the growth in transport from the Lin , throughput increases, the starting time is increased, the starting time in the long rotor creates heat, and was lost, this is not another cage motor starting torque of the economy fixed, will cause rapid acceleration of transportation to start inevitably caused tension conveyor belts and the impact of vertical vibration, which depends on the load. because the motor starting current is 6 times the rated current, so you need to use large-capacity power supply in order to avoid over-voltage during start because of the above Drag the way of reasons for this transport is not a particularly long economies. with a coupling of the squirrel cage motor starter drag cage coupling with a hydraulic starter motor to drag the drag really starting to improve the situation but long time and cause motor heating, resulting in coupling heat start, so start-ling coupling device needs to be installed outside. So the cost of the entire drive system greatly increased. In addition, the health of poor transport, the hydraulic circuit and cooling device maintenance more complex. DC inverter drag drag and technical point of view from the drag, which drag the technology than the slip ring motor drag to advanced. the belt conveyer belt speed constant, so the 25, do not need to change the drag force is also the same power without adjusting the speed in the case of the investment drive drag slip ring motor is twice the drag method, the use of the sea side which drag on economic worries drive Drag method. a ride Excerpt Joo Lee to the United States, \145 17 ~ 19)-B ・
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