1、英语文献 Mine scraper conveyor soft-start mode of selection and application High yield and high efficiency in the coal mine fully mechanized coal face of the building, to face big-long, large to support the requirements of the power of Shearer and scraper conveyor. Ordinary fully mechanized coal face of
2、 the long-general in about 150 m, scraper conveyor transport capacity of 500 t / h around high yield and high efficiency and fully mechanized coal face of the long-General to 180 300 m, scraper conveyor transport capacity of 800 t / h and above, therefore, conveyor power greater growth. Pingdingshan
3、 Coal Mining Group Company to as an example, the scraper conveyor of power in most 400 (2 200) kW and above, the largest for the 750 (2 375) kW. Scraper conveyor to the start-up launched mainly two-speed, limited by a small number of filling hydraulic coupler, which started two kinds of ways, not on
4、ly operating costs, and it stands high. Therefore, the need to seek new technology and equipment to meet the requirements of high yield and high efficiency. 一 、 current situation and existing problems (一 ) limit filling hydraulic coupler in the high-power, big load, its size, when it with the motor
5、and reducer connection, the greater the share of space. Limited space in the work of the occasion, too much volume will scraper conveyor layout difficult. Coupled with increased hydraulic transmission distance and high-speed rotating state and easy to have a greater impact on the radial dynamic load
6、, and the slowdown caused by electrical installations damaged. Coupled with the input and output speed than the speed of usually no more than 97 percent, that is impossible to achieve input shaft and output shaft of sync, which must exist greater power loss, reducing the efficiency of the transmissi
7、on system. (二 ) two-speed motor drive system is currently in Chinas mining scraper conveyor in common. Under normal circumstances, the rated speed motor to start the half, corresponding to start motor power is also rated power of the half. To low-speed motor launch, when the completion of the proces
8、s initiated after the switch to high-speed operation, from start to the normal operation of sub-levels, in part, reduce the impact of the launch. In this way to use the special two-motor winding, two-and two-speed cable root switch. Two-speed motor complex structure, high cost, power supply system e
9、quivalent to two Motors, low-speed switching not effectively controlled, the point of failure, equipment cables, at the same time, the fault lines will be doubled the increase. 二、 soft-start several advanced methods of comparison (一 ) thyristor surge soft-start mode. Start the process launched at th
10、e slope, pulse conflict jump start, speed up the slope, fast slope. Pulse conflict way can jump start the biggest short-term output of over 95 per cent of the rated voltage, to impose a short-time great starting torque (equivalent to 90 per cent of direct starting torque), to overcome the static fri
11、ction and the inertia of the transmission system. This soft-start approach and broad prospects for application. (二 ) viscous liquid transmission soft-start mode. Dodge is a typical U.S. company CST (consecutive start transmission) soft-start devices. CST soft-start devices currently relies mainly on
12、 imports, high prices, the general mine unbearable. CST-mechanical, hydraulic, electronic control, cooling, materials for integrated, manufacturing, high-precision control, supply of spare parts in particular inconvenience. Scraper conveyor is moving equipment, changing work environment, the extreme
13、ly bad conditions, equipment failure rate correspondingly increased, the greater difficulty of maintaining the higher operating costs and narrow work space constraints of the CST in China mine AFC Machine applications. (三 ) Frequency soft-start mode. Scraper conveyor used, its performance advantages
14、 not play； expensive, the general mine unbearable； components used its power IGBT modules, high-voltage IGBT module of the international embargo on China, so its difficult to voltage levels To 1140 V, to its coal mine conveyor on the application has brought great difficulties. (四 ) SRM-driven approa
15、ch. SRM is a new driver, in other sectors (such as the textile industry, machinery manufacturing, washing machines, etc.) have a very wide range of applications. The main feature is activated when the current low torque, speed performance, and easy to use pure electric control to achieve stepless sp
16、eed regulation, and long run. Motor exclusive use of SRM, but flow, not burning motor, with good prospects for development. Components used for power IGBT module, it is very difficult to achieve voltage 1140 V. The current high-power explosion SRM is still in the development stage, the bulk smaller,
17、 higher cost, not suitable for the underground mine scraper conveyor application. (五 ) soft-start mode. Taiyuan, the company developed the Whitby soft start-FM-speed technology, speed regulator technology, vacuum technology for magnetic start one, start with the characteristics of analog FM. The sur
18、ge started with the way the soft start-voltage slope start, current feedback sudden jump start and start compared to the initial start more torque, can achieve the low-speed torque activated to ensure that equipment from the take-up, by Static to dynamic start running, you can solve the problem of o
19、verloading difficult start. 三、 application Pingdingshan Coal Mining Group after analysis and comparison, in October 2004 quoted a 2-QJT250/1140 (660) soft start, and Zhangjiakou Coal Factory production SGZ-764/400-scraper conveyor support, instead of the original The restrictions start filling hydra
20、ulic coupler, in a small mining 6-31080 fully mechanized coal face applications, is now running for six months, and its soft-start control of the scraper conveyor incident does not appear, better-performing. The starter the following key features: and hydraulic coupler, compared with two-speed motor
21、, scraper conveyor drive system and power supply system to maximize the simplified, the reliability of the system significantly increased. start the process of, 5 s power to block protection. start the process of automatic measurement load, automatically determine sudden jump start, the commencement
22、 of the biggest obstacles, the largest motor torque, the buck started to overcome the shortcomings. the starter all-digital control circuit, is set up to facilitate the actual starting current can be accurately controlled in the following 4 Ie, the current small motor launch, reduce the impact of the power grid. scraper conveyor loaded with empty and a smooth start to maximize the Elimination of Transmission of the
