This is for my gr9 tech. I tried to read the description of the two types of lifts on the site, but i find it too hard to understand. (>_<) can you descrube all the differences of the two ski lifts in a way a gr9 would understand?
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What are all the differences between detachable lifts and fixed grip lifts
Started by ski77les, Mar 30 2010 05:58 AM
4 replies to this topic
#2
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- Administrator I
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Mountain Operations
Posted 30 March 2010 - 04:22 PM
I'll bite, In simple terms ? I'll try.....
The line machinery (towers and sheave assemblies) are essentially the same
The chairs and hanger arms are the same
The haul rope does the same job, but LINE speed is about 450fpm for a FG, 1000+fpm on a Detach
STATION speed is the same on a FG but 200-300 fpm on a Detach
The rope grips are both usually spring applied, FG's put on by a lift mechanic with a torque wrench, then moved and re-torqued every 200-500 hours usually. Just a clothesline really.
On a Detach, the grip opens as the carrier (chair, hanger, grip) enters the station (the grip being forced open under an opening rail) detaches from the rope,engages the tire conveyor(which moves the carrier through the station) slows down in the decel part of the conveyor,goes slowly through the contour or curve, load area, then speeds up in the accel part, then attaches to the rope again. The conveyor and rope speed are the same in the grip opening and closing areas (attach/detach points).
The rope continues to run at a constant speed (subject to operator intervention in case of misloads, misunloads, and general passenger inattentiveness)only the carrier slows down and speeds up.
My apologies to those of you with conveyor chains.
Clear like Mud Huh ?
The line machinery (towers and sheave assemblies) are essentially the same
The chairs and hanger arms are the same
The haul rope does the same job, but LINE speed is about 450fpm for a FG, 1000+fpm on a Detach
STATION speed is the same on a FG but 200-300 fpm on a Detach
The rope grips are both usually spring applied, FG's put on by a lift mechanic with a torque wrench, then moved and re-torqued every 200-500 hours usually. Just a clothesline really.
On a Detach, the grip opens as the carrier (chair, hanger, grip) enters the station (the grip being forced open under an opening rail) detaches from the rope,engages the tire conveyor(which moves the carrier through the station) slows down in the decel part of the conveyor,goes slowly through the contour or curve, load area, then speeds up in the accel part, then attaches to the rope again. The conveyor and rope speed are the same in the grip opening and closing areas (attach/detach points).
The rope continues to run at a constant speed (subject to operator intervention in case of misloads, misunloads, and general passenger inattentiveness)only the carrier slows down and speeds up.
My apologies to those of you with conveyor chains.
Clear like Mud Huh ?
...Mike
#3
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- Industry I
- 1,333 Posts:
Minnesota Skier!
Posted 30 March 2010 - 06:24 PM
If you are unable to understand a few key terms used on this site, like "sheaves" "carriers" and whatnot, I would recommend referring to the glossary. You will find pictures and definitions of a lot of this stuff there. http://www.skilifts....ld/glossary.htm
#4
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- Member
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New User
Posted 06 April 2010 - 05:22 AM
mikest2, on 30 March 2010 - 04:22 PM, said:
I'll bite, In simple terms ? I'll try.....
The line machinery (towers and sheave assemblies) are essentially the same
The chairs and hanger arms are the same
The haul rope does the same job, but LINE speed is about 450fpm for a FG, 1000+fpm on a Detach
STATION speed is the same on a FG but 200-300 fpm on a Detach
The rope grips are both usually spring applied, FG's put on by a lift mechanic with a torque wrench, then moved and re-torqued every 200-500 hours usually. Just a clothesline really.
On a Detach, the grip opens as the carrier (chair, hanger, grip) enters the station (the grip being forced open under an opening rail) detaches from the rope,engages the tire conveyor(which moves the carrier through the station) slows down in the decel part of the conveyor,goes slowly through the contour or curve, load area, then speeds up in the accel part, then attaches to the rope again. The conveyor and rope speed are the same in the grip opening and closing areas (attach/detach points).
The rope continues to run at a constant speed (subject to operator intervention in case of misloads, misunloads, and general passenger inattentiveness)only the carrier slows down and speeds up.
My apologies to those of you with conveyor chains.
Clear like Mud Huh ?
The line machinery (towers and sheave assemblies) are essentially the same
The chairs and hanger arms are the same
The haul rope does the same job, but LINE speed is about 450fpm for a FG, 1000+fpm on a Detach
STATION speed is the same on a FG but 200-300 fpm on a Detach
The rope grips are both usually spring applied, FG's put on by a lift mechanic with a torque wrench, then moved and re-torqued every 200-500 hours usually. Just a clothesline really.
On a Detach, the grip opens as the carrier (chair, hanger, grip) enters the station (the grip being forced open under an opening rail) detaches from the rope,engages the tire conveyor(which moves the carrier through the station) slows down in the decel part of the conveyor,goes slowly through the contour or curve, load area, then speeds up in the accel part, then attaches to the rope again. The conveyor and rope speed are the same in the grip opening and closing areas (attach/detach points).
The rope continues to run at a constant speed (subject to operator intervention in case of misloads, misunloads, and general passenger inattentiveness)only the carrier slows down and speeds up.
My apologies to those of you with conveyor chains.
Clear like Mud Huh ?
Meh, simple enough, i'll just look at the glossary for the words i dont know there.
Otherwise, its okay. Thx
#5
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- Industry II
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Established User
- Interests:Climbing, Cycling
Posted 06 April 2010 - 07:34 AM
ski77les, on 06 April 2010 - 05:22 AM, said:
Meh, simple enough, i'll just look at the glossary for the words i dont know there.
Otherwise, its okay. Thx
Otherwise, its okay. Thx
I'll add a bit more... electrical stuff
- The drive horsepower is generally larger due to the higher speeds. See HP equation This means larger drive, motor & gearbox.
- Both drive and return stations have electronic anti-collision systems to supervise the mechanical accelerators & decelerators.
- Lift codes require lifts running > 3 m/s to have rope-positioning devices (RPDs) on towers in addition to mechanical derail detection switches.
- Due to higher rope-speeds & greater inertia, the braking systems tend to be more sophisticated.
- fixed-grip : 1800 people per hour, 9 minute ride, cost $1.5M
- detachable-grip : 2800 pph, 4 minute ride, cost $5.0M+
- Guest comfort loading & unloading a detachable is superior to FG. Beginners love detachable.
- Detachable-grip lifts require higher cost maintenance & higher level of technical staff. Detach costs much more $$ to own & operate than FG.
- If the customers expectations are for high-speed detachable-grip, then a hill that has detach will win customers from the hill that doesn't (all else being equal).
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