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Table 1:Specification,dimensions and tensile strength of carbon spring steel wire
| wire diameter (mm) | tensile strength(b/Mpa) | wire diameter (mm) | tensile strength(b/Mpa) | ||||
| Grade B | Grade C | Grade D | Grade B | Grade C | Grade D | ||
3.00 | 1320-1670 | 1570-1860 | 1710-1960 | 6.00 | 1220-1470 | 1420-1660 | 1520-1760 |
| 3.20 | 1320-1620 | 1570-1810 | 1660-1910 | 7.00 | 1170-1420 | 1370-1570 | 一 |
| 3.50 | 1320-1620 | 1570-1810 | 1660-1910 | 8.00 | 1170-1420 | 1370-1570 | |
| 4.00 | 1320-1620 | 1520-1760 | 1620-1860 | 9.00 | 1130-1320 | 1320-1520 | |
| 4.50 | 1320-1570 | 1520-1760 | 1620-1860 | 10.00 | 1130-1320 | 1320-1520 | 一 |
| 5.00 | 1320-1570 | 1470-1710 | 1570-1810 | 11.00 | 1080-1270 | 1270-1470 | |
| 5.50 | 1227-1520 | 1470-1710 | 1570-1810 | 12.00 | 1080-1270 | 1270-1470 | 一 |
Table 2:Specification,dimensions,and tensile strength of oil quenched and tempered silicon manganese alloy spring steel wire
| wire diameter (mm) | tensile strength(b/Mpa) | ||
| Grade A | Grade B | Grade C | |
7.00 8.00 9.00 | 1422-1569 | 1520-1667 | 1618-1765 |
9.50 10.00 11.00 12.00 | 1373-1520 | 1471-1618 | 1569-1716 |
1.2 Main Dimensional Tolerances of Springs
1.2.1 The tolerance of the spring inner diameter is±1.0%of the basic inner diameter dimension D1.
1.2.2 The free length H0 of the spring is the reference dimension.
The tolerance for the total number of coils of the spring is±1.0%of the total number of coils n1.The total number of turns of the manual garage door spring should be strictly controlled within a tolerance requirement of ±0.5%of n¹of the total number of turns.
1.2.3 The spring should have no initial tension in its free state,and the gap between coils should be less than 0.2mm to prevent "S'shaped bending after installation.
1.2.4 Spring load (unit:N)
a.The allowable tolerance for experimental load is±2.0%of the usage load.
b.The working deformation of the spring under load must be selected within the range of 40%to 75%of the total deformation of the spring.
1.2.5 Spring stiffness (in kg/mm)
Spring stiffness is the ratio of the unit working load (total weight of the door body G)to the total torsion degree(liting height of the door body F).
Pre twist the spring once,hold it at the corresponding degree of Ps for 10 minutes,and then continuously twist it
under the same load for 3 times.Measure the deformation of the spring degree,and the difference between the two measurement results should not exceed 1.0%of the total torsion degree.
1.4.1 The spring should not break after 20000 fatigue tests,and the load loss after the test should not exceed 1.5%of the working load.The loss of torsion degree should not exceed 1.0%of the total torsion degree.
1.4.2 Electric remote control automatic doors should have a spring break protection device:when the spring breaks, the protection device should be able to prevent the door body from sliding
1.7.1 Measure the inner diameter of the torsion spring with a vernier caliper
1.7.2 Measure the free angle using universal or specialized measuring tools.
1.7.3 Measure the length of the torsion arm using a universal or specialized measuring tool.
1.7.4 Measure the total number and spacing of torsion springs with a steel tape measure.
1.8 Visually inspect the surface quality of the spring,requiring it to be smooth,scratch free,and undergo rust prevention treatment.
Testing items
Key Project:Safe Fatigue Life
Main items:load,deformation resistance,inner diameter,total number of turns
General items:initial tension,surface quality
Packaging,transportation,and storage
Introduction to industrial door torsion springs
NECESSARY DATA FOR TORSION SPRING DESIGN
Technical Standards for Automatic Door Springs
