数以千计的螺旋输送机在烘焙，打样和冻结的应用中为全球食品加工行业服务于面包店部门;冻结鱼，家禽和红肉等;对酱油制造商的巴斯腐败和调理应用。这是清晰的原因：通过与标准输送系统的比较，螺旋最小化机器占地面积，消除多个转移，维护产品方向，使受控环境实现一致的产品质量，降低能源成本，减少手动处理，增加产品吞吐量。

因此，我们的专家螺旋团队拥有完整的新建和改造来完成。但是当食品制造商经历螺旋皮带澎湃（也称为滑动粘贴）时，我们也经常接近，当皮带未能平稳运行时;或者当皮带太紧并且在外面抬起（称为Xmas树效果）。皮带捕捉和产品运动也是要求我们支持的食品加工器的挑战。

This new series of blogs explains the mechanics of low-tension spirals and how they work, and offers guidance on how to ensure optimized performance and years of efficient and reliable production.

My first blog article concentrates on overdrive: what it is, and how to manage it for maximum belt life and top operational performance.

摩擦是关键

Low tension spirals consist of a helix curve. They use the friction between the moving drum (or cage) and the inside belt edge to provide the drive force. The main drive has to overcome the friction force between the loaded belt and the support rails. Drive efficiency depends on the coefficient of friction between the belt edge and drum, and the belt underside and support rails.

过载是积极的滑点

The key relationship is between the speed of the belt and the surface speed of the drum acting on the inside edge of the belt. The drum surface must move slightly faster than the inside edge of the belt, giving positive slippage, and this is referred to as overdrive.

Overdrive is required in order to develop a frictional driving force for the belt. With no overdrive, or worse, negative slippage, the drum would act as a brake, severely damaging the belt.

The proper amount of overdrive is not a precise value; it depends on friction factors between the belt and drum, belt underside and support rails, and product load. A reduction in friction between the belt underside and support rails greatly improves operational performance and helps to maintain an optimum overdrive setting. But how to achieve this? Experimentation will be required – as all systems vary in some way. The first step is to measure the overdrive.

1. 结构组装在一起
   – columns and
   - 梁
2. Drum or cage
3. 笼条酒吧
4. 笼条酒吧帽
5. 鼓驱动器
   (or cage drive or primary drive)
6. Radius belt
7. 运行
8. Out-run
9. Aux. Belt drive, (take up drive)
10. 返回路径
11. Take up and take up tower
12. Dance roller
13. Carry way

如何测量过载on a low-tension spiral conveyor system

• Stand by a static element (e.g. a structural column) as your starting location, place an object on the belt directly in line with an identifiable cage bar or point on the drum (make a mark on the cage bar or drum if necessary) and observe the system for one revolution back to your starting location.
• 笼条栏将返回对象前方的起始位置;它前方的距离是过载量。
• 作为起点，建议将滑移设置为3到4个垂直间距（层间距）的倍数。
• If the object was placed on the outside edge of the belt, allow a multiple of 4 to 5 tier spacings of overdrive. The optimal overdrive is usually specified by the manufacturer or belt supplier.

请注意，每个系统都有不同的滑动，这取决于许多因素。例如，环境温度和成分的变化都可以影响滑动。如果结果在上面的参数之外，则可能需要调整过载控件

Why it’s vital to check overdrive regularly

Overdrive should be checked regularly. When it’s sub-optimal, it can lead to a variety of problems, as set out below.

Excess or high overdrive

• Uneven belt operation (surging) because the belt becomes so loose that it loses contact with the drum and briefly stops until the take-up drive pulls it tight enough against the drum to drive again.
• 由于运动过剩，这种浪涌可能会导致产品出现问题。
• Wear of inner edge module, that is in contact to the drum or cage bars, is increased.

低过载

• Higher belt tension, which causes the belt to tend to flip up, and results in a shorter belt life.

因此，最佳的过驱动量是平稳操作和低张力之间的折衷。如上所述，每个系统都不同，需要特殊处理。例如，在使用带罗纹UHMW笼条栏盖时，随着肋骨型材从滚筒提供更多驱动力，需要更少的过驱动。当使用固体钢桶时，也需要较少的过载，因为由于带边缘和滚筒之间的摩擦系数较高，因此来自滚筒的驱动力增加。

清洁的重要性

如上所述，摩擦是关键，如此彻底清洁带，鼓和螺旋安装非常重要。实际上，影响螺旋滑动和性能的主要因素是影响摩擦的污染水平。

有时腰带和安装似乎是清洁的肉眼，但实际上仍然可以有一部脂肪或桶上的薄膜，这会影响摩擦。在我的下一个博客文章中，我将解释清洁的重要性，并提供如何以最有效和有效的方式清洁螺旋安装的提示。

复杂性呼叫专家输入

In our experience, many problems with spirals can be fixed by adjusting the overdrive settings. Our highly experienced spiral engineers are glad to assist customers who lack the confidence to do this themselves. Beyond this,Habasit提供全面的技术支持服务优化螺旋操作，从修复运行问题到更换带，以建议改造和新的结构。

For more information on how to ensure the correct running of your low tension spiral check back here. We plan to post more technical blogs on this important topic. And feel free to联络我随时了解您对您的特定需求的专家建议，或安排螺旋团队会员访问您的网站。

You might also be interested in:

• Why do POM belts squeak?
• Sprocket pitch diameter: why it’s important and how to measure it
• How can I repair a plastic modular belt?
• Are HACCP rules applicable to conveyor belts?
• 什么是十字和多边形效应？