Special Spring Steel Belt For Rolling Shutter Door
Rolling shutters offer a more attractive alternative to security bars for windows. They protect glass and furnishings from intruders without the “what are they trying to hide” statement that security bars give.
Easily control your shutter by adjusting the operation via an internal wall mounted rocker switch or rod crank system. It’s also possible to secure the shutter when it is down with a ground hasp and secondary bullet locks.
High Carbon Steel 50# & 65MN
Spring steel is a separate group of construction alloy steels with a high elasticity limit, fatigue resistance, resistance to stress relaxation and good damping and shock absorption properties. It also responds well to various heat treatment processes, making it suitable for a High carbon spring quenched and tempered steel strip wide variety of applications. The excellent wear resistance of 65 Mn spring steel is especially noteworthy. This makes it an ideal material for agricultural equipment, such as plow blades and harrow tines, as well as industrial tools like saw blades and knives.
To improve the mechanical performance of the steel, the microstructure and tensile properties were investigated by means of cyclic heat treatment. The results show that the cyclic phase transformation process promotes the refinement of grain size, leading to improved wear resistance of the steel. The average grain size decreases from 52 m to 9 m after the cyclic heat treatment, and the wear loss correlates well with the hardness of the steel.
Furthermore, the effect of different austenitizing and tempering temperatures on the microstructure and mechanical properties of the steel were studied. It was found that the TF process results in ultrafine elongated ferrite grains and fine precipitation carbides, and the tempering temperature determines the varieties and morphology of the precipitation carburized structure. Consequently, the super strength and high ductility of the 65 Mn steel with a normal grain martensite structure are achieved by processing the material at appropriate temperatures.
General Q235 Steel Plate
Q235 is a common carbon structural steel with good plasticity and weldability. It is widely used in the field of construction and manufacturing because of its strength, durability, and stability. It can be used to make general mechanical parts with certain elongation, such as pins, shafts, anchor rods, tie rods, ferrules, and nuts.
A large number of transport pipelines use Q235 low-carbon steel due to its strong processing performance and low cost. The corrosion behavior of this material is also very important for the safe operation of these pipes. The accelerated corrosion test is an effective method for evaluating the safety of this type of material.
The characterization of the corrosion products was carried out by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the corrosive damage to the steel surface was caused by chlorine ions, while the passivation layer exhibited a higher level of oxygen atoms.
The results indicate that a significant amount of the protective oxides was formed during the exposure test. This result is consistent with the theoretical assumption that the protective oxides are generated in a hot and dry environment by the interaction of water molecules with the sprayed salt solution. In addition, the corrosion weight loss of the steel sample tended to decrease as the time of exposure to the salt spray increased.
Surface Alvanized in Silvery
This galvanized steel has a zero spangle surface finish and is ideal for applications where the appearance of the finished product is important. It can also be used in applications where a high level of corrosion resistance is required. The galvanization process involves immersing the steel in zinc which helps to protect it from rust and corrosion.
There are many different types of galvanized steel. Some are bright silver in color, while others have a darker finish. Some are also hot-dip galvanized, which means that they Tinplate Steel Coil / Sheet are coated in a bath of molten zinc. The advantage of these processes is that they offer a very durable coating, which is resistant to rust and corrosion.
You can find this type of galvanized steel at hardware stores, retailers that specialize in shutters, and online on Windowo. When you are replacing your shutter rope, make sure that you have a helper to help you climb the ladder and lock the pulley (the large metal wheel on which the string is wound). After you have locked the pulley, take out the wedge and then with the help of your helper slowly rewind the new rope. Before you finish, make sure that the new rope is the correct length. Once you are finished, make sure that everything is working properly and lower the blind.
Specifications
Rolling shutters protect door and window openings from burglary, weather conditions and other adverse factors. Our roller shutters are manufactured on modern automated lines meeting European and International quality standards. Metal components are zinc-coated and painted to ensure corrosion resistance, prevent negative effects of aggressive environments and prolong operational life of the shutters. Our company offers a wide range of rolling shutter sizes, operating systems and accessories.
The device according to the present invention consists of two main elements (A and B) with a torsion spring (M) placed and attached between them. The first element (A) consists of a special pulley with a fixed hub designed to be inserted and held against the fixed shaft that supports a series of rotating pulleys around which the rolling shutter is rolled. The special pulley also has a drum (5) inserted and free to rotate in both directions and characterised by an external toothed crown (7) that cooperates with a balancing retention pawl (8) able to interfere with said toothed crown in case of failure of the spring (M), thus making it impossible for the descending travel of the rolling shutter.
The balancing retention pawl is pushed away by the thrust of the special return spring to leave its rest position and reach the toothed crown (7) in order to interrupt the rotation of the rotating drum. A microswitch is designed to immediately inform the user of the breakage of the torsion spring (by means of indicator lights or acoustic means), thus also simultaneously cutting out the electrical power supply of the motor in case the rolling shutter is powered by electric drive.
