英文翻译带式输送机传动系统的发展分析（中英6900字数）
河南理工大学万方科技学院本科生英文翻译
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Belt conveying systems development of driving
system
FU Jun-qing; WANG Cong; HUO Wei (Department of Information and
Electrical Engineering; China University of Mining & Technology
(Beijing) Beijing 100083; China);
Among the mothods of material conveing employed, belt conveyors
play a very important part in the reliable carrying of material over
long distancees at competitive cost. Conveyor systems have become
larger and more conplex and drive systems have also been going
through a process of evolution and will continue to do so. Nowadays,
bigger belts require more power and have brought the need for larger
individual drives as well as multiple drives such as 3 drives of 750
KWfor one belt (this is the case for the conveyor drives in
chengzhuang mine0. The ability to control drive acceleration toque is
critical to belt conveyors performance. An efficednt drive system
should be able to provide smooth,soft starts while maintaining belt
tensions within the specified safe limits. For load sharing on
multiple drives.torque and speed control are also important
considerations in the drive syetens design. Due to the advances in
conveyor drice control technology, at present many more reliable.
COST-effective and peerformance-driven conveyor drive systems
covering a wide range of power are available for customer'choices.
河南理工大学万方科技学院本科生英文翻译
____________________________________________________________________________________________
1 Analysis on conveyor drive technologies
1.1 Direct drives
Full-voltage stsrters. With a full voltage stsrter design, the
conveyor hesd shaft is direct-coupled to the motor through the gear
drive. Direct full-voltage starters are adequate for relatively low-
power, simple-profile conveyors.with direct full- votage
startersnocontrol is provided for various conveyor loads and.
Depending on the radio between full and no load power
requirements,emty starting times can be three or four times faster
than full load. The maintennance-free staring system is simpke, low-
cost and very reliable, however,they cannot control starting torque
and maximum stall torque:therefore,they are limited to the low-ower,
simple-profile conveyor belt drives.
Reduced-voltage starters, As conveyor power requirement
increase,controlling the applied motor torque during the acceleration
period becomes increasingly important.Because motor torque is a
function of voltage, motor voltage must be controlled. This can be
achieved through reduced-voltage starters by employing a silicon
controlled rectifier. A common starting method with SCR reduced-
voltage starters is to apply low voltage initially to take up
conveyor belt slack. And then to apply a timed linear ramp up to full
voltage and belt acceleration. When acceleration is complete. The
SCRS,which control the appareled voltage to the electric motor. Are
locked in full conduction, providing full-line voltage to the motor.
Motor with higher torque and pull up torque can provide better
staring torque when combined with the SCR which are available in
sizes up to 750kw .
Wound rotor induction motors, wound rotor induction motors are
河南理工大学万方科技学院本科生英文翻译
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connected directly to the drive system reducer and are a modified
configurate of a standard AC induction motor . By inserting
resistance in series with the motors rotor windings,the modified
motor control system controls motor torque. For conveyor
starting ,resistance is placed in series with the rotor for low
initial torque. As the conveyor accelerates,the resistance is reduced
slowly to maintain a constant accelerating torque. On multiple-drive
systems. An external slip resistor maybe left in series with the
motor windings aid in load sharing. The motor systems have a
relatively simple design. However, the control system for these can
be highly complex,because they are based on computer control of the
resistance switching. Today, because they are based on computer
control of the resistance switching. Today, the majority of control
systems are custom designed to meet a conveyor systems particular
specifications. Wound rotor motors are appropriate for systems
requiring more than 400 kw .
DC motor . Dc motor,available from a fraction of thousands of kw ,
are designed to deliver constant torque below base speed and
constant kw above base speed to the maximum allowable revolutions per
minute. With the majority of conveyor drives, a dc shunt wound motor
is used. Wherein the motors rotating armature is connected
externally. The most common technology for controlling dc drives is a
SCR device. Which allows for continual variable-speed operation. The
dc drive system is Germanically simple, but can include complaining
custom -designed electronics to monitor and control the compel
system. This system option is expensive in comparison to other soft-
start systems. But it is a reliable,cost-effective drive in
applications in which torque,load sharing and variable speed are
primary considerations. Dc motors generally are used with higher-
摘要：
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河南理工大学万方科技学院本科生英文翻译____________________________________________________________________________________________BeltconveyingsystemsdevelopmentofdrivingsystemFUJun-qing;WANGCong;HUOWei(DepartmentofInformationandElectricalEngineering;ChinaUniversityofMining&Technology(Beijing)Beijing100083;China);Amon...
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作者：闻远设计
分类：课程设计课件资料
价格：10光币
属性：18 页
大小：171.1KB
格式：DOC
时间：2022-11-14
