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输送机皮带上的静电
日期:【2017-05-08 11:05】 共阅:【】次

 

标题:输送机皮带上的静电

 

Static electricity is defined as electrical charge at rest. It can be caused by the triboelectric effect and can be accumulated by inductive and conductive charging.

静电是指静止时的电荷。它可以由摩擦带电效应引起,也可以通过感应和传导充电积累形成。

 

 

A static spark discharge can be dangerous in gaseous or dusty atmospheres as it can cause ignition, in grocery stores as customers and employees can be shocked regularly, and in electronic manufacturing settings. When two surfaces in close proximity are moved relative to one another, a static charge is generated (the triboelectric effect).

静电火花放电因容易形成着火点,因此在气体和粉尘环境中是很危险的,此外,如果存在于杂货店,也会给定期惊扰顾客和工作人员。若存在于电子制造业中,也会成为一个安全隐患。当相邻的两个表面彼此相对移动时,就会产生静电电荷。(即摩擦带电效应)

 

Real life examples  生活案例

 

A person walking across a carpet can generate more than 30,000 electrostatic volts at a relative humidity in the 10 – 20% range. The same person walking across the same carpet would exhibit less than 2,000 electrostatic volts if the relative humidity were 70% or more. This is due to the high bleed off static charges by the humid air.

一个人在相对湿度10-20%的范围内走过地毯时,会产生超过30,000的静电电压。如果相对湿度变为70%或者更高,同样的人走过同一片地毯时所产生的静电电压会低于2,000。这是由于潮湿空气所带来的高静电释放。

 

When slitting conveyor belting that passes over a flat surface and through pinch rollers, a static electric charge can be generated, especially when humidity is low, causing the hair on the operator’s arm(s) to rise or causing the operator to feel a “zap” or jolt of electrical current.

当切割一条运行在平滑表面且经过夹送滚筒的输送机皮带时,就会产生静电电荷,特别是当湿度很低的时候,会使操作人员手臂上的毛发竖起或使操作人员嚓的一下被电到甚至感受到电流的震荡。

 

On belt conveyors, the belt surface is continually leaving the pulley surface, generating static electricity. As the conveyor continues to operate, the static charge will continue to accumulate and increase unless it is bled off (or discharged) in some manner.

在皮带输送机中,皮带表面会持续离开滚筒表面,这就会产生静电。由于皮带机持续运转,静电也会因此逐步积累增加,除非以某种方式进行放电。

 

Static charge during installation 安装过程中的静电

 

In a conveyor belt installation, we cannot control static by eliminating generations. However, accumulation and storage of static electricity can be controlled. 

在输送机皮带的安装过程中,我们无法使静电消失,但是我们可以控制静电的积累和贮存。

 

Accumulation and storage of static charges can be controlled by making the entire system sufficiently conductive and contiguously and properly grounded. This means that the belt, pulley lagging, pulley, bearings, conveyor structure and electrical ground must all be connected electrically.

静电的积累和贮存可以通过建立完整的充分的传导系统并采取持续的适当的接地处理来进行控制。这意味着皮带,滚筒包胶,滚筒,轴承,输送机结构以及接地全部都要电连接。

 

Specific to the conveyor belt and in order to be sufficiently static conductive, the surface resistivity must be 300 meg-ohms or less. This is the ISO and OSHA standard.

具体到输送机皮带,为了保证其充分的静电传导,表面抗力必须要在300兆欧或者更低。这是ISOOSHA标准所要求的。

 

What is 300 meg-ohms? 3 x 108 ohms … or 300 x 106ohms … 300,000,000 ohms.

什么是300兆欧?3*108欧姆... 或者300*106欧姆...300,,000,000欧姆

 

One of the best ways to “ground” a conveyor system is to literally discharge the static charge through the framework of the conveyor… through the floor… into the ground/earth. If a conveyor system is not sufficiently grounded, a static conductive belt will not, alone, control the electrical charge.

输送机系统“接地”的最好方式之一就是通过输送机框架真正做到静电放电...通过地面...进入地下。如果输送机系统没有充分接地,静电传导皮带将不能单独控制电荷。

 

What conveyor belts can be used to reduce static electricity? 什么样的输送机皮带可以用来减少静电电荷?

 

Some Sparks products that meet or exceed the ISO and OSHA standards for static conductivity include:

Sparks的部分产品可以达到或者高于ISOOSHA标准对于静电传导的要求,包括:

Wear Flex NSF 15 A/S @ 10,000,000 ohms

Mono Flex LBU 210 @ 280,000,000 ohms

Mono Flex WU 110 A/S, WU 210 A/S, BP 290 

BU 200 I @ 300,000,000 ohms

 

In manufacturing conveyor belting, static conductivity can be added to the textile, polymer or both.

在生产输送机皮带的过程中,静电传导还会蔓延到纺织品,聚合物或者同时蔓延到二者身上。

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