Lub hau npog caij nplooj ntoos hlav Telescopic sprial yog ua los ntawm cov hlau zoo thiab tau kho cua sov los tiv thaiv lub pob ntsia hlau, ncej thiab pas nrig. Lub tes tsho tiv thaiv tsis sib cuag nrog tus tswv cuab tiv thaiv los ntawm lub flange nruab nrab uas tau teeb tsa rau ob qho kawg ntawm tus tswv cuab tiv thaiv. Kev nyab xeeb ntawm kev sib txuas ntawm lub tes tsho tiv thaiv thiab lub flange nruab nrab yog ua tiav los ntawm nws tus kheej lub zog ua ntej compressive elastic, yog li nws ruaj khov hauv kev ua haujlwm, yoog tau thiab yoog tau, thiab muaj suab nrov tsawg heev. Qhov saum npoo yog dub thiab ci, thiab sib koom ua ke nrog feem ntau flange qhov chaw ntawm lub tshuab.
Lub tes tsho tiv thaiv siv txoj siv hlau kauv tau hloov kho raws li cov yam ntxwv xws li txoj kab uas hla ntawm lub pob ntsia hlau, qhov chaw thiab cov pas nrig, thiab qhov deb txav mus los. Yog li ntawd, cov txheej txheem hauv qab no yog siv thaum xaj khoom:
1. Cov neeg siv raug xaiv raws li cov qauv txheem uas peb lub Hoobkas muab.
2. Cov neeg siv khoom muab cov tes tsho tiv thaiv D, Lmax, Lmin (qhov yuav tsum tau tshwj xeeb D2)
Tsim thiab tsim los ntawm peb lub Hoobkas, tus nqi raug suav raws li cov qauv txheem.
1. Lub flange ntawm lub hau hlau kauv yog ua los ntawm tus neeg siv. Peb lub Hoobkas muab cov duab kos.
2. Tus nqi txiav txim ntau yuav muaj luv nqi
3. Tsis tas yuav tsum muaj D2 tsuas yog rau cov qhov loj me tshwj xeeb xwb.
| Cov Lus Qhia Tshwj Xeeb | Lmax (hli) | Lmin (hli) | D1 (hli) | D2 (hli) | Cov Lus Qhia Tshwj Xeeb | Lmax (hli) | Lmin (hli) | D1 (hli) | D2 (hli) |
| 20-250-30 | 250 | 30 | 20 | 40 | 70-400-80 | 400 | 80 | 70 | 95 |
| 30-250-45 | 250 | 45 | 3 | 41 | 70-750-100 | 750 | 100 | 70 | 94 |
| 30-450-50 | 450 | 50 | 030 | 50 | 70-1400-120 | 1400 | 120 | 70 | 104 |
| 30-600-50 | 660 | 50 | 30 | 56 | 70-1800-120 | 1800 xyoo | 120 | 70 | 120 |
| 40-300-45 | 300 | 45 | 40 | 54 | 75-400-80 | 400 | 80 | 75 | 89 |
| 40-550-50 | 550 | 50 | 40 | 67 | 75-600-100 | 600 | 100 | 75 | 95 |
| 40-800-80 | 800 | 80 | 40 | 65 | 75-900-120 | 900 | 120 | 75 | 97 |
| 40-950-80 | 950 | 80 | 40 | 69 | 75-1200-120 | 1200 | 120 | 75 | 104 |
| 50-550-50 | 550 | 50 | 45 | 73 | 75-1600-1100 | 1600 xyoo | 110 | 75 | 115 |
| 45-700-80 | 700 | 80 | 45 | 68 | 80-400-80 | 400 | 80 | 80 | 94 |
| 45-900-100 | 900 | 100 | 45 | 70 | 80-600-120 | 600 | 120 | 80 | 97 |
| 45-1000-100 | 1000 | 100 | 45 | 73 | 80-900-110 | 900 | 110 | 80 | 105 |
| 50-500-50 | 500 | 50 | 50 | 72 | 80-1200-120 | 1200 | 120 | 80 | 115 |
| 50-700-80 | 700 | 80 | 50 | 70 | 80-1400-120 | 1400 | 120 | 80 | 120 |
| 50-900-100 | 900 | 100 | 50 | 77 | 85-400-80 | 400 | 80 | 85 | 100 |
| 45-1200-100 | 1200 | 100 | 50 | 84 | 85-600-100 | 600 | 100 | 85 | 105 |
| 55-350-50 | 350 | 50 | 50 | 72 | 85-800-125 | 800 | 125 | 85 | 106 |
| 55-550-80 | 550 | 80 | 55 | 72 | 85-1000-125 | 1000 | 125 | 85 | 126 |
| 55-800-80 | 800 | 80 | 55 | 78 | 85-1200-125 | 1200 | 125 | 85 | 132 |
| 55-1000-120 | 1000 | 120 | 55 | 77 | 90-400-100 | 400 | 100 | 90 | 105 |
| 55-1400-110 | 1400 | 110 | 55 | 86 | 90-600-100 | 600 | 100 | 90 | 111 |
| 60-400-50 | 400 | 50 | 60 | 79 | 90-800-125 | 800 | 125 | 90 | 111 |
| 60-600-80 | 600 | 80 | 60 | 78 | 90-900-125 | 900 | 125 | 90 | 127 |
| 60-900-100 | 900 | 100 | 60 | 87 | 90-1200-125 | 1200 | 125 | 90 | 137 |
| 60-1200-120 | 1200 | 120 | 60 | 88 | 95-400-100 | 400 | 100 | 95 | 110 |
| 60-1600-120 | 1600 xyoo | 120 | 60 | 98 | 95-600-125 | 600 | 125 | 95 | 112 |
| 65-400-50 | 400 | 0 | 65 | 85 | 95-800-125 | 800 | 125 | 95 | 130 |
| 65-700-80 | 700 | 80 | 65 | 87 | 95-1000-125 | 1000 | 125 | 95 | 137 |
| 65-1000-100 | 1000 | 100 | 65 | 95 | 100-600-120 | 600 | 125 | 100 | 118 |
| 65-1400-110 | 1400 | 110 | 65 | 99 | 100-800-120 | 800 | 120 | 100 | 135 |
| 65-1800-110 | 1800 xyoo | 110 | 65 | 109 | 120-600-125 | 600 | 125 | 120 | 150 |