controlling hydraulic hose reel using extension cylinder pressure

[Pixel123]

Hello all,

I have an application where I am building a fairly large hose reel with 50mm internal diameter water hose.
The hose reel unwinds with sequenced cylinders of a loader crane. The hose will also be supported at every extension cylinder.
First I was thinking of using a spring to retract this. But this hose reel needs to rotate 7x and the weight of the hose with water is approx. 90 kg. +/-200lbs
Next I was thinking of putting an hydraulic motor on this reel to rewind the hose reel when the cylinders extend/retract (with a max pressure setting to regulate the force by which the motor "pulls" on the hose).

The plan is to use the oil already going to the cylinders to control the reel hydraulic motor. However, If I put this simply in parallel, this won't work as the extension would then be limited by the relief pressure of the hydraulic motor. Any idea how I should tackle this control issue?

Best regards

 

[hydtools]

Use a smaller motor with the higher relief pressure.

Ted

 

[Pixel123]

Hi Ted, thanks for the reply.
This might be an option, but I have a doubt. The extension cylinder pressure will be different when the crane is retracting/extending with/without a load. If I dimension the motor to retract the hose when no load is present on the crane but with a high relief setting, it would pull harder on the hose when there is a load attached to the crane. If the motor is small enough it might not pull the hose apart at higher pressures .
I think it is crucial first to measure the pressures with/without load and the required pulling force for this.