Resistances to the motion in mining belt conveyors
Jerzy Antoniak1
Research workers of the Silesian Technical University (Antoniak, Lutyński, 1999) have been carrying out measurements on mining belt conveyors for years. The tests covered belt conveyors characterized by considerable lengths and high capacities, complicated configurations of a conveyor route and equipped with driving systems of different type in which soft starting facilities were incorporated or not included. One of the objectives of the tests was to determine quantities of principal resistances to motion the results of which have been presented in this paper.
Key words: mining, principal resistances to motion, belt conveyor, field measurements.
Decrease - oriented tendency in resistances to the motion in belt conveyors
The results of a great number of field measurements taken on belt conveyors allow to conclude that a high accuracy of calculations of principal resistances to the motion is obtained when using a basic method as described in the standard DIN 22101 on condition that the coefficient f of principal resistances to the motion has been properly selected.
Among principal resistances to the motion are included: resistances to idler rotation, indentation rolling resistances, flexure resistance of the belt and flexure resistances of bulk material. The coefficient of principal resistances to the motion f combines the force of gravity of a sum of masses being in motion with principal resistances to the conveyor motion FP, N thus
FP =
f ⋅ g ⋅ ∑m N
where ∑m − sum of moving masses, kg,
g − acceleration corresponding to the force of gravity, m/s2.
It is considered that a standard quantity is f = 0.02 but in the case of underground mining f = 0.025 or f =
0.03. Among lumped resistances of a conveyor FL, N are included: resistances to belt bending on drums, rotation resistances of all drums, resistances when loading the material to be conveyed, and N are included: resistances to belt bending on drums, rotation resistances of all drums, resistances when loading the material to be conveyed, and resistances of belt cleaners. Lumped resistances are expressed as a coefficient of length C:
C = ( FP + FL ) / FP = 1 + FL / FP
Combining C and f together brings about
FP + FL = C ⋅ f ⋅ g ⋅ ∑m N
When taking into consideration additional resistances produced e.g. by advancing arrangement of idlers in
relation to the direction of the belt movement FA, N and resistances of lifting and lowering of the material being conveyed FLL, N a total resistance to the motion is obtained which allows to determine the drive’s power.
A distribution of the power consumption given
in percentage of power used to overcome particular resistances to the motion in long belt conveyors laid horizontally (of about 1.5 km in length) is presented in fig. 1.
Recently a lot of attention is given to the problem of decreasing the power consumption in drives of a belt conveyor. This purpose was achieved by the application of drives controlled with frequency converters, introduction of special idler sets resulting in the reduction
Fig.1. Conveyor power consumption for long horizontal profiles 1 – indentation rolling resistance, 2 – flexure resistance of bulk material, 3 - flexure resistance of the belt,
4 – bearing resistance of the idler, 5 – secondary resistances,
6 – extraordinary resistances
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杰西Antoniak1
研究人员的Silesian技术大学出版社,1999年,Lutyński(Antoniak)已经实施测量在采矿带式输送机很多年了。这个测试覆盖了带式输送机具有相当高的能力,长度和复杂的路由和配备驾驶输送机系统的不同类型的软启动设备整合或不包括在内。的目标之一,是为了确定量的测试,结果校长、抗逆性运动已进行了阐述。
关键词:采矿、主抵抗运动,带式输送机、现场测量。
下降趋势——导向、抗逆性的运动带式输送机
结果大量现场测量了带式输送机允许得出这样的结论:一种高精度的计算,对运动的主要抗性时使用一种基本方法中22101 DIN标准的条件下,对主要电阻系数康乐及文化事务署大型活动组的运动已经正确选择。
在主抵抗运动包括:托轮换,抗逆性,柔性抗凹陷滚动阻力的皮带和柔性抗性的散装材料。校长电阻系数的动作外结合重力的作用下的一笔群众运动,在对输送机运动阻力,N
成品=
⋅康乐及文化事务署大型活动组收⋅∑米克
在∑的m−移动群众,公斤。
g−加速度相对应的重力的作用下,m / s2。
它被认为是一个标准的数量是女= 0.02但在地下开采女= 0.025或女=
0.03)。在集中的一个输送机,N包括:在鼓、抗逆性带弯,旋转阻力的鼓、电阻加载的材料时,不同,
杰西Antoniak1
研究人员的Silesian技术大学出版社,1999年,Lutyński(Antoniak)已经实施测量在采矿带式输送机很多年了。这个测试覆盖了带式输送机具有相当高的能力,长度和复杂的路由和配备驾驶输送机系统的不同类型的软启动设备整合或不包括在内。的目标之一,是为了确定量的测试,结果校长、抗逆性运动已进行了阐述。
关键词:采矿、主抵抗运动,带式输送机、现场测量。
下降趋势——导向、抗逆性的运动带式输送机
结果大量现场测量了带式输送机允许得出这样的结论:一种高精度的计算,对运动的主要抗性时使用一种基本方法中22101 DIN标准的条件下,对主要电阻系数康乐及文化事务署大型活动组的运动已经正确选择。
在主抵抗运动包括:托轮换,抗逆性,柔性抗凹陷滚动阻力的皮带和柔性抗性的散装材料。校长电阻系数的动作外结合重力的作用下的一笔群众运动,在对输送机运动阻力,N
成品=
⋅康乐及文化事务署大型活动组收⋅∑米克
在∑的m−移动群众,公斤。
g−加速度相对应的重力的作用下,m / s2。
它被认为是一个标准的数量是女= 0.02但在地下开采女= 0.025或女=
0.03)。在集中的一个输送机,N包括:在鼓、抗逆性带弯,旋转阻力的鼓、电阻加载的材料时,不同,经销功率损耗
在比例的权力用于克服阻力运动的特别长带式输送机的铺设横向(大约150公里长)呈现在图1。
最近很多关注的问题是降低功耗在带式输送机驱动的。这个目的是通过应用与变频器、驱动控制引入特殊托集缩减
图1。输送能源消耗水平型材长1 -缺口滚动阻力,2 -挠度电阻的散装材料,3 -挠度电阻的皮带,
4 -轴承电阻的阻值5 -少壮不努力,老大,
6 -非凡的抗性