Screw Pitch
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| Micro Screw Pitch Gauge Blades Adjuster for T Rex 450 RC Helicopter Black New | |
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$2.19 Time Remaining: 19d 8h 44m Buy It Now for only: $2.19 |
| Traxxas 3705 Rustler XL 5 31 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw pitch gauge for RC helicopter | |
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$2.99 Time Remaining: 7d 15h 4m Buy It Now for only: $2.99 |
| K01001 1 Main Blade Screw pitch gauge f ESky Trex walkera E FLITE 400 Belt CP S | |
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$2.89 Time Remaining: 16d 23h 31m Buy It Now for only: $2.89 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY HB King 2 V2 Belt CP CP | |
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$1.89 Time Remaining: 14d 17h 45m Buy It Now for only: $1.89 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY HB King 2 V2 Belt CP CP | |
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$1.79 Time Remaining: 14d 13h 47m Buy It Now for only: $1.79 |
| Main Blade Screw Pitch Guage For 450 500 Esky RC Heli | |
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$1.79 Time Remaining: 17d 17h 44m Buy It Now for only: $1.79 |
| Traxxas 3605 Stampede XL 5 31 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Gauge Adjuster For RC Helicopter Trex 450 500 ESKY New | |
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$1.79 Time Remaining: 12d 11h 36m Buy It Now for only: $1.79 |
| Main Blade Screw Pitch Guage For T rex 450 500 600 Esky RC Heli Helicopter Tool | |
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$1.68 Time Remaining: 22d 16h 6m Buy It Now for only: $1.68 |
| Traxxas 3605 Stampede XL 5 19 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 3705 Rustler XL 5 28 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Gauge for Esky HB King 2 Belt CP | |
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$1.00 Time Remaining: 18d 9h 17m Buy It Now for only: $1.00 |
| Black Main Blade Screw pitch gauge 250 450 500 Helicopter FX001 | |
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$3.00 Time Remaining: 17d 9h 35m Buy It Now for only: $3.00 |
| Main Blade Screw pitch gauge For TRex 450 500 Esky HB king 2 RC Helicopter | |
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$0.99 Time Remaining: 12d 16h 56m Buy It Now for only: $0.99 |
| Traxxas 6747 Gear 11T Pinion 32 Pitch w Set Screw | |
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$3.00 Time Remaining: 13d 21h 41m Buy It Now for only: $3.00 |
| Main Blade Screw Pitch Gauge for TREX 250 450 500 550 600 700 RC helicopter blad | |
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$3.98 Time Remaining: 1d 1h 46m Buy It Now for only: $3.98 |
| Traxxas 3605 Stampede XL 5 16 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 2419 Gear 19 T Pinion 48 pitch Set Screw NIP | |
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$5.50 Time Remaining: 15d 5h 21m Buy It Now for only: $5.50 |
| Traxxas 3605 Stampede XL 5 23 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Guage For 450 500 Esky RC Heli | |
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$1.83 Time Remaining: 12h 11m Buy It Now for only: $1.83 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY | |
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$1.00 Time Remaining: 25d 13h 50m Buy It Now for only: $1.00 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$1.00 Time Remaining: 18d 12h 16m Buy It Now for only: $1.00 |
| Main Blade Screw pitch gauge For ESKY Belt CP Heli | |
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$3.41 Time Remaining: 14d 8h 42m Buy It Now for only: $3.41 |
| Screw Blade Pitch Gauge RC Helicopter Esky TRex Walkera | |
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$1.88 Time Remaining: 19d 10h 1m Buy It Now for only: $1.88 |
| Traxxas 3605 Stampede XL 5 21 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 5803 Slash 4x2 SCT 19 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 35m Buy It Now for only: $4.50 |
| TRAXXAS Pinion Gear 48 Pitch 16 Tooth w Set Screw | |
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$3.09 Time Remaining: 28d 6h 50m Buy It Now for only: $3.09 |
| Traxxas 6745 Gear 9T Pinion 32 Pitch w Set Screw | |
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$3.00 Time Remaining: 4d 5h 10m Buy It Now for only: $3.00 |
| Micro R C Helicopter Screw Pitch Gauge for 450 x 1 pc | |
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$5.29 Time Remaining: 9d 21h 1m Buy It Now for only: $5.29 |
| Traxxas 2405 Bandit XL 5 Buggy 16 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas TRA2416 Pinion Gear 48P 48 Pitch 16T 16 Tooth with Set Screw | |
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$5.69 Time Remaining: 18d 5h 12m Buy It Now for only: $5.69 |
| Main Blade Screw Pitch Gauge Adjuster For RC Helicopter Trex 450 500 ESKY New | |
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$1.84 Time Remaining: 11d 11h 11m Buy It Now for only: $1.84 |
| Micro Screw Pitch Gauge Blades Adjuster for T Rex 450 RC Helicopter | |
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$2.18 Time Remaining: 11d 11h 14m Buy It Now for only: $2.18 |
| Traxxas 3705 Rustler XL 5 21 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 37m Buy It Now for only: $4.50 |
| COX CROWN COXALOY Gear 29 Tooth 4142 Set Screw type 48 pitch 1 8 axle Slot Car | |
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$5.99 Time Remaining: 29d 4h 16m Buy It Now for only: $5.99 |
| Main Blade Screw Pitch Guage 400 450 500 RC Helicopter | |
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$1.99 Time Remaining: 12d 22h 1m Buy It Now for only: $1.99 |
| 2x RC model Main Blade Screw pitch gauge Ruler Trex 450 500 600 Helicopter | |
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$6.99 Time Remaining: 3d 22m Buy It Now for only: $6.99 |
| Traxxas 3942 Gear 12T Pinion 32 Pitch w Set Screw | |
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$2.80 Time Remaining: 1d 4h 29m Buy It Now for only: $2.80 |
| Traxxas 3946 Gear 16T Pinion 32 Pitch w Set Screw | |
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$2.80 Time Remaining: 3d 2h 28m Buy It Now for only: $2.80 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$1.00 Time Remaining: 29d 12h 31m Buy It Now for only: $1.00 |
| Traxxas 3943 Gear 13T Pinion 32 Pitch w Set Screw | |
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$2.80 Time Remaining: 1d 20h 52m Buy It Now for only: $2.80 |
| New Main Blade Screw Pitch Gauge For 450 500 | |
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$3.89 Time Remaining: 1d 14h 53m Buy It Now for only: $3.89 |
| Traxxas 3945 Gear 15T Pinion 32 Pitch w Set Screw | |
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$2.80 Time Remaining: 3d 2h 28m Buy It Now for only: $2.80 |
| Main Blade Screw Pitch Gauge For 450 Belt CP King 2 36 | |
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$3.41 Time Remaining: 24d 10h 37m Buy It Now for only: $3.41 |
| Main Blade Screw Pitch Gauge for Esky HB King 2 Belt CP | |
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$2.60 Time Remaining: 28d 14h 20m Buy It Now for only: $2.60 |
| NEW Main Blade Screw Pitch Heli Pitch Gauge for 250 700 size helicopters bl | |
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$4.98 Time Remaining: 1d 1h 43m Buy It Now for only: $4.98 |
| Traxxas 5803 Slash 4x2 SCT 16 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$2.60 Time Remaining: 28d 10h 13m Buy It Now for only: $2.60 |
| Traxxas 2405 Bandit XL 5 Buggy 19 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 2405 Bandit XL 5 Buggy 21 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 2405 Bandit XL 5 Buggy 28 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 3605 Stampede XL 5 28 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 2405 Bandit XL 5 Buggy 23 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 3705 Rustler XL 5 23 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 37m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY | |
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$1.00 Time Remaining: 10d 12h 54m Buy It Now for only: $1.00 |
| Traxxas 2405 Bandit XL 5 Buggy 31 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 3705 Rustler XL 5 19 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Main Blade Screw Pitch Guage X cell E Flite 400 450 500 | |
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$0.99 Time Remaining: 6d 21h 28m Buy It Now for only: $0.99 |
| Main Blade Screw Pitch Gauge for TREX 250 450 500 550 600 700 RC helicopter blad | |
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$6.87 Time Remaining: 1d 1h 49m Buy It Now for only: $6.87 |
| Main Blade Screw Pitch Gauge for Esky HB King 2 Belt CP | |
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$2.60 Time Remaining: 29d 11h 27m Buy It Now for only: $2.60 |
| COX CROWN COXALOY Gear 31 Tooth 3815 Set Screw type 48 pitch 1 8 axle NOS | |
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$5.99 Time Remaining: 21d 8h 19m Buy It Now for only: $5.99 |
| COX CROWN COXALOY Gear 35 Tooth 3816 Set Screw type 48 pitch 1 8 axle NOS | |
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$5.99 Time Remaining: 21d 8h 20m Buy It Now for only: $5.99 |
| Traxxas 5803 Slash 4x2 SCT 28 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 5803 Slash 4x2 SCT 23 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| Traxxas 5803 Slash 4x2 SCT 31 Tooth 48 Pitch Pinion Gear Grub Screw | |
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$4.50 Time Remaining: 7d 36m Buy It Now for only: $4.50 |
| COX CROWN COXALOY Gear 28 Tooth 4045 Set Screw type 48 pitch 1 8 axle NOS | |
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$5.99 Time Remaining: 21d 8h 17m Buy It Now for only: $5.99 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$2.60 Time Remaining: 4d 14h Buy It Now for only: $2.60 |
| Main Blade Screw pitch gauge For ESKY Belt CP Heli | |
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$3.41 Time Remaining: 21d 8h 43m Buy It Now for only: $3.41 |
| COX CROWN COXALOY Gear 24 Tooth 4043 Set Screw type 48 pitch 1 8 axle Slot Car | |
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$5.99 Time Remaining: 29d 4h 15m Buy It Now for only: $5.99 |
| COX CROWN COXALOY Gear 26 Tooth 4044 Set Screw type 48 pitch 1 8 axle NOS | |
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$5.99 Time Remaining: 21d 8h 15m Buy It Now for only: $5.99 |
| Traxxas 3952 Gear 22T Pinion 32 Pitch w Set Screw | |
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$3.00 Time Remaining: 3d 2h 28m Buy It Now for only: $3.00 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$1.00 Time Remaining: 4d 6h 30m Buy It Now for only: $1.00 |
| White Main Blade Screw pitch gauge 250 450 500 Helicopter RHS10180 03 | |
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$3.50 Time Remaining: 17d 9h 35m Buy It Now for only: $3.50 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$1.00 Time Remaining: 12d 12h 53m Buy It Now for only: $1.00 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$2.60 Time Remaining: 2d 11h 6m Buy It Now for only: $2.60 |
| 1960s Vintage Crown Gear 30 tooth for 1 8 Set Screw 48 pitch NOS slot car | |
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$3.99 Time Remaining: 18d 29m Buy It Now for only: $3.99 |
| 1960s Vintage Crown Gear 36 tooth for 1 8 Set Screw 48 pitch NOS slot car | |
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$3.99 Time Remaining: 18d 30m Buy It Now for only: $3.99 |
| Main Blade Screw Pitch Gauge For 450 Belt CP King 2 36 | |
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$2.99 Time Remaining: 25d 16h 20m Buy It Now for only: $2.99 |
| Traxxas 7041 48 Pitch Pinion Gear 18 Tooth with Set Screw NIP | |
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$2.98 Time Remaining: 2d 8h 30m Buy It Now for only: $2.98 |
| 1960s Vintage Crown Gear 32 tooth for 1 8 Set Screw 48 pitch NOS slot car | |
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$3.99 Time Remaining: 18d 27m Buy It Now for only: $3.99 |
| 1960s Brass Pinion Gear 22 Tooth with 48 Pitch 093 shaft Set Screw Style NOS | |
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$7.99 Time Remaining: 9d 22h 58m Buy It Now for only: $7.99 |
| 1960s Brass Pinion Gear 9 Tooth with 48 Pitch 093 shaft Set Screw Style NOS | |
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$7.99 Time Remaining: 9d 22h 49m Buy It Now for only: $7.99 |
| 1960s Brass Pinion Gear 14 Tooth with 48 Pitch 093 shaft Set Screw Style NOS | |
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$7.99 Time Remaining: 9d 22h 53m Buy It Now for only: $7.99 |
| COX CROWN COXALOY Gear 27 Tooth 3814 Set Screw type 48 pitch 1 8 axle NOS | |
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$5.99 Time Remaining: 29d 6h 18m Buy It Now for only: $5.99 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY | |
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$1.00 Time Remaining: 20d 11h 51m Buy It Now for only: $1.00 |
| Traxxas 3950 Gear 20T Pinion 32 Pitch w Set Screw | |
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$3.00 Time Remaining: 3d 2h 28m Buy It Now for only: $3.00 |
| Main Blade Screw Pitch Gauge for TREX 450 500 600 ESKY | |
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$1.00 Time Remaining: 21d 9h 24m Buy It Now for only: $1.00 |
| Main Blade Screw Pitch Guage For T rex 450 500 Esky RC Helicopter Tool | |
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$1.68 Time Remaining: 7d 14h 23m Buy It Now for only: $1.68 |
| Main Blade Screw Pitch Gauge for Walkera RC Helicopter | |
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$1.00 Time Remaining: 15d 7h 10m Buy It Now for only: $1.00 |
Background of twin screw extruder
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a twin screw extruder comprising a casing with a working direction; two partially intersecting casing bores, which are parallel to each other; two shafts, which are disposed in the casing bores and which are drivable to rotate in the same direction of rotation about an axis of rotation, the axes of rotation having a distance A from each other; and single-flight kneading disks, which are fixed on the shafts and have surface lines extending parallel to the respective axis of rotation, the kneading disks, in a cross-section perpendicular to the axis of rotation, comprising a crest, which is formed as a segment of a circle about the respective axis of rotation and which has a crest angle b and a radius RA ; a bottom, which is formed as a segment of a circle about the respective axis of rotation and has a bottom angle g and a radius RI ; two flanks, which join the crest and the bottom; RA >RI und A≅RA RI applying.
2. Background Art
Single-flight kneading disks are known from DE 813 154 B. They have a crest angle greater than 90° , in this regard possessing a comparatively important cross-sectional surface. The kneading disks wipe the casing as well as themselves. In these known kneading disk arrangements, no overall conveyance of the treated material takes place in or against the operating direction of an extruder which lodges the kneading disks. The mixing effect by this type of kneading disks is low. The same is true for the kneading effect. Furthermore, also the free cross-sectional surface is defined and thus the mean dwell time, within a lengthwise section of the extruder, of the material to be treated.
U.S. Pat. No. 5,573,332 teaches a screw element for a screw-type extrusion machine. The screw elements are helical and have varying pitch directions. Lengthwise mixing is obtained by the screwing in opposite directions, whereas crosswise mixing is attained by the elongated wedge of the flank arc. This crosswise flow is a typical continuous shear flow, which is primarily a dispersive mixing operation. Dividing the flow into various partial flows, recirculation and offset combination thereof do not take place, which is why the distributive mix is not optimal.
DE 43 38 795 C teaches a continuously working multi-screw extruding machine for masses to be plastified. Provided between two closely intermeshing conveying screws and a dam-up element is a screw which conveys forwards and adjacent thereto a non-intermeshing screw which conveys backwards. A drawback resides in that the wall of the casing cannot be scraped off, since the screws have a diameter that corresponds to half the center distance. This does not prevent the material to be treated from sticking on the casing wall. Since the casing wall is not wiped, this results in very bad heat transmission. In the case of high differences of temperature between the casing wall and the product, this will result in important inhomogeneities of temperature which will moreover negatively affect the material to be treated.
SUMMARY OF THE INVENTION
It is an object of the invention to improve a twin-screw extruder of the generic type such that given a minimal energy input and high dwell time, the entire material to be mixed is completely distributively mixed and simultaneously the casing wall is entirely wiped.
This object is attained by 0°≤b≤45° applying to the crest angle b. The gist of the invention resides in providing cylindrical kneading disks--i.e. kneading disks having surface lines extending parallel to their respective axis--with a very small crest angle. This reduces the energy input and helps obtain mixing of the entire volume. Furthermore, complete scraping of the walls of the casing bores is ensured, i.e. there is no sticking, and good heat transmission is ensured. The wedge flows along the flanks of the kneading disks prevent neutral zones of reduced mixing to originate. The intermeshing action of the kneading disks ensures intense mixing of the material to be treated. The kneading disks wipe each other at least partially. Given a constant diameter of the casing bores, the free cross-sectional area available to the material to be treated is increased, as a result of which the throughput can be raised.
The extruder, in which the kneading disks of at least one shaft are offset in the working direction by an offset angle e in the direction of rotation for conveyance against the working direction, 0°>|e|>180° applying, has the advantage of return conveying being attained, which strongly increases the dwell times.
The arrangement, according to which the kneading disks of one shaft are offset in the working direction against the direction of rotation by an offset angle |e|>180° and the kneading disks of the other shaft are offset in the working direction in the direction of rotation by an offset angle |e|>180° , has the advantage that especially intense mixing is attained through a circulating way of conveyance.
Additional advantages and features of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a diagrammatic illustration of a lateral longitudinal view of a twin screw extruder;
FIG. 2 is a cross-section through the extruder on the line II--II of FIG. 1 with the illustration of two kneading disks according to the invention;
FIG. 3a) to h) are cross-sections according to FIG. 2 at varying moments in a chronological sequence with an addendum modification angle z=0°;
FIG. 4a) to h) are illustrations as in FIG. 3 with an addendum modification angle z=45°;
FIG. 5a) to h) are illustrations as in FIG. 3 with an addendum modification angle z=90°;
FIG. 6 is an illustration as in FIG. 2 with kneading disks arranged to be offset successively; and
FIG. 7 is a partial longitudinal section through the extruder on the line VII--VII of FIG. 1.
About the Author
The invention relates to a twin screw extruder comprising a casing with a working direction; two partially intersecting casing bores, which are parallel to each other; two shafts, which are disposed in the casing bores and which are drivable to rotate in the same direction of rotation about an axis of rotation, the axes of rotation having a distance A from each other;
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