A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.
• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).
• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.
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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Ball screw industry Ball screw definition
The ball screw is the product of converting the reversal motion into a linear motion; or transforming the linear motion into the ambition of the reversal motion. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
â—ŽThe ball screw consists of a screw, a nut and a ball. Its function is to convert the rotary motion into a linear motion; this is the further extension and development of the ball screw; the significance of this development is to change the bearing from the rolling action to the sliding action. Because of its small frictional resistance; ball screws are widely used in various industrial equipment and precision instruments.
â—Ž Ball screw is the most commonly used transmission component in machine tools and precision machinery; its main function is to convert rotary motion into linear motion; or to convert torque into axial repetitive force; together with high precision, reversibility and High power features.
â—Ž Ball screw features:
1. Compared with the sliding screw pair, the driving torque is 1/3.
Because there are many balls between the screw shaft and the nut of the ball screw pair, it can get a high rolling power. Compared with the sliding screw pair, the driving torque reaches 1/3 or less, that is, it arrives. The power required for the same sports results is 1/3 of the use of the rolling screw pair. It is very helpful in saving electricity.
2, high-precision to ensure that the ball screw pair is connected with the highest level of mechanical equipment made in Japan; especially in the grinding, assembling, viewing the factory environment of each process, the temperature 0?? Chivalry? Because of the perfect quality management system, the precision is ensured.
3, micro feed can be ball screw pair because it uses ball movement, so the starting torque is very small, will not show the squatting phenomenon like sliding movement, can ensure the completion of accurate micro feed.
4, no backlash, rigid high ball screw pair can be added to the pressure, because the pre-pressure can make the axial gap to a negative value, and then get higher rigidity (in the ball screw by adding pressure to the ball, in practice In mechanical equipment, etc., because the repulsive force of the ball can increase the rigidity of the silk mother part).
5, high-speed feed can be ball screw because of high motion power, low heat, so high-speed feed (motion) can be completed.
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Source: Bearing network time: 2013-08-27