Non Fric Cylinder Vertical



Purpose of use

  • The main purpose of this device to provide low-friction and low-hysteresis (low mechanical loss) during reciprocating motion.



Special features

  • 1. Low mechanical loss and hysteresis.
  • 2. Long stroke production.
  • 3. Low maintenance.
  • 4. Simplified structure compared with conventional products prevents failure due to rubber getting caught. The sliding part of the cylinder is lubricated by the by an air film through micro-leakage, low sliding drastically reduces wear.
  • 5. Operated by micro-pressure.
  • 6. Long life.
  • 7. Operating cylinder is very light, made from CFRP (Carbon Fiber Reinforced Plastic).




Specification 

  •  Cylinder bore diameter     φ14~φ100
     Operating pressure range  0.01〜0.5MPa (Regulary use 0.01〜0.3Mpa)
     Temperature / Humidity  5℃〜25℃ / Under 85%RH
  •  Lubricant / Moisture     Unavailable
     Initial pressure       0.16kPa for NFC-40-100               
     Working pressure      1kPa for NFC-40-100



Use

  • ● Reeling machine touch roll
  • ● Dancer control device for web transport line




Production range

  • ● Cylinder diameter is Φ14〜Φ100(Standard)
  • ● sizes larger than Φ100 are also available (Custom-made)




Distribution agent

  • ● Exclusive agent for Non Fric Cylinder
  • SHINKO Corp TEL:81-6-6552-3171
  • ● Please contact the above number for estimates / quotations.




Thrust calculation

  • Thrust F=Ap

     ↑ Intake


  • A : Piston pressure receiving area (mm)

  • D:Cylinder inside diameter (Bore diameter) (mm)
  • p:Working pressure       (Mpa)


Example




Commentary

  • ● Image 1 is an example of vertical dancer where the distance from Non Fric Cylinder (below NFC) support point and that to the shaft of the dancer roll around the fulcrum A and B are equal in length. In this case, the thrust applied by NFC is equal to that of the dancer roll and transport is accompanied by a change in direction.
  • ● For example, if NFC thrust is set to 50N, the dancer roll thrust will receive -50Nga.
  • ● Since the reel angle of substrate is set to 180 degrees, NFC thrust is halved between dancer roll’s downstream and upstream, the resulting 25N tension matches that of NFC thrusts. In this use case, if the film tension for some reason changes, the dancer roll will move either up or down. The amount is transmitted to NFC via dancer arm fulcrum, pushing or pulling the cylinder, consequently changing the pressure inside NFC.
  • ● Typically, the NFC vent is equipped with an electro-pneumatic converter and high precision pressure regulator valve, allowing for NFC to regulate internal pressure automatically by reducing or increasing the amount of air. However, as can be seen in Image 4, when the proportion of the distance to dancer roll shaft and that to NFC fulcrum is skewed, wider movements by the dancer roll can result in dancer arm deformation, NFC mechanical loss and bearing friction which all together can lead to the movement of the dancer around its center to become one sided, leading to a loss of functionality.
  • In order to prevent that, please avoid the method demonstrated in Image 4.
  • Also, when using an NFC dancer please limit the number to one cylinder.
  • Using two cylinders may result in interference and malfunction.




図1

図2

図3

図4





Caution

  • Use a long stroke as much as possible.
  • Usable temperature is normally 25℃. Please contact us if exceeded.
  • Zero temperature coefficient of CFRP (Carbon Fiber Reinforced Plastics) is used for the outer cylinder and, because the inner cylinder is made from aluminum which is susceptible to temperature expansion, the gap between the inner and outer cylinders may shrink resulting in the two coming into contact and halting.
  • This can also lead to a change in the amount of leakage.

How to use

Only vertical

Accumulator

Even if the load (air demand of the cylinder) varies, it is important for accumulator to be set so that air supply source does not change.

One recommendation is to use a container that can bear the pressure of 0.5Mpa,
another is to create cavities in a dancer frame or machine frame for use as a tank.

In this case, please be vigilant of rusting that may damage the cylinder. (A mist separator is recommended for use.)

Piping

Regarding the air pipes on the side receiving the load from the accumulator, the thicker and shorter the better.
This is to enable the quick response to the air consumption and supply / exhaust speed due to movement of the dancer cylinder.

Air regulator 

Please make sure to insert the air regulator right before the cylinder. (Precision regulator)

Dancing direction

Vertical dancer is recommended to be used as dancer device. 

Compressed Air

Please use oil-free purified air and a dust filter.

Offset Load

Unavailable. 

Guide Roll

Please use a dancer roll which rotates lightly.

Air supply

When air supply runs short even for a short time, the cylinder thrust declines.
In this case, the dancer roll cannot adjust to a change in tension, causing tension fluctuation and hunting.








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