Passing Cylinder

It is a little difficult to understand the nature of the problem without a picture but perhaps some suggestions will help.

Can you provide thermal insulation to protect the cylinder? How about your connecting hardware. Most metals transfer heat quite easily. Stainless steel is generally a poor conductor of heat if you need mechanical strength. Otherwise, ceramic or phenolic components reduce heat transfer to your air cylinder.

Have you considered relocating the air cylinder to a cool spot and transferring the motion through levers or cables? Are you using Viton (high temperature rubber) seals in the air cylinder?

yup i've already put a metal ZINC between the cutter and the striking rod/piston shaft of the cylinder but still it easily broke-up (passing) .

i will not consider by relocating the cylinder because its the area /positon the the cylider was in a close/ tight location.

The cylinder may have standard seals which are listed as NBR (buna rubber) with max operating temperature about 250 F. Change them to Viton which has a max operating temperature of about 400 F. Most cylinder manufactures offer Viton seals as an extra if the application needs it.

Hi,

You sound like you need Viton, high temperature seals. Part Number for the seal kit is CQ2B40-PS-XB6 (the XB6 suffix indicates High Temperature seals)

Best regards,

John

thanks, i will consider this,

Do CQ2B40-PS-XB6 are the same with CQ2B40-15D-X202 ?

Are they differ in the striking rod /piston shaft of the cylinder ?

Hi Alpha,

The part number I gave you is for a High Temperature Seal Kit. The X202 suffix shows the cylinder is made to interchange with the now obsolete CQ1 series which was made from a casting and not an extrusion.

Best regards,

John

Ok.. so x202 are obselete?

thanks it really helps me.

Hi alpha,

I think the machine might be many years old, pre 1986???, the X202 suffix means that they modified the CQ2, current series cylinder, so that it drops in place of the CQ1 series it replaced, that must have been in the original design.

Best regards,

John

your right the machine was to old but still operational

for today I've coordinated the machine spare part to the storekeeper for the replace a new seal type of (repair kit) of the cylinder.

Hi Alpha, one thing to consider is the alignment of knife / cutter with respect to sealing jaw slot. I bet there is spacer (fibra) in between Knife and its mounting plate. Make sure the spacer is in the right thickness so the knife can freely move along the sealing jaw slot. With the knife touching the slot surface, misalignment of piston will occour causing seal guide to scratch the surface of pneumatic cylinder bore. Scratches will then cause air passing. We have experience the same problem on our VFFS, in which we went through a breakdown analysis.

Hope this help.

Thanks, I'll consider your suggestion.

You could try an -XB6 (Heat resistant cylinder (150ºC)

See page 7-6-4 http://www.airlinehyd.com/apollo/smc/CQ2.pdf