There are three different types of escalator chains. Two and three have an equal number of teeth, and they’re designed to have an equal degree of wrap, as in a sidewalk. In addition, the effective lever arm of the upper strand must match the effective lever arm of the lower strand.
Angular position of chain wheels 2 and 3
The angular position of chain wheels 2 and 3 on the escalator is important for the movement of the escalator. The angular position of chain wheels 2 on an escalator is approximately 30deg different from that of chain wheels 3 on the same escalator. This difference is equal to half of the angular pitch of each chain wheel, which is 360deg divided by the number of teeth.
Chain wheels 2 and 3 on an escalatory are usually equipped with an even number of teeth and have an angle of wrap of 180 degrees. This angle of wrap is normal for moving sidewalks. In addition, the effective lever arm of the chain wheels on the lower strand should be equal to the lever arm of the escalator’s upper strand.
The angular position of chain wheels 2 and 3 on the escalator is important for preventing excessive noises and unnecessary wear. High stress levels will damage the chain wheels, and the wheels themselves could become very expensive. Moreover, the angular position of chain wheels 2 and three on the escalator should also be adjusted to eliminate any oscillations in the redirecting station.
As you move up and down on the escalator, the steps will follow the escalator’s steps. In order to keep them level and prevent them from collapsing on one another, the steps will be connected to the rotating chain wheels. These chain wheels will continue to move upwards until they collapse together at the top or bottom of the escalator.
Tensile strength
The tensile strength of an escalator chain is determined by testing and analyzing its components. This study focused on the tensile strength of the 20A-2 drive chain, a popular escalator chain model. The results showed that the tensile strength of the chain meets the applicable standards. However, microstructure analysis revealed decarburized phenomena and poor surface condition.
The chain wheels used in escalators usually have an even number of teeth and a 180-degree angle of wrap. This design has significant drawbacks, including high costs and high wear points. In addition, the spacing between the chain wheels is limited, which means the chain will wear out faster.
The step chain must be designed to be replaceable. The segments should be removable to allow for replacement. The escalator chain shall have a total of six-axle sections on each escalator. The two ends of each step axle shall form pivot pins for the adjacent links.
The tensile strength of escalator chain is a crucial factor for safe operation. It should be able to withstand 450 kg/m2 load without distortion. It should also be able to withstand the weight of passengers. In addition to the tensile strength, the chain’s pitch should be small enough to minimize the chordal action and allow for smooth operation.
A properly installed step chain in an escalator can be extremely strong. Its width and height vary depending on the model. In addition, step chains should be able to handle the weight of passengers. These chains are also designed with guides that help them run smoothly. In addition, the steps must be installed every 400 millimeters.
Weight
The escalator chain is the central component of an escalator. Its purpose is to provide a handhold for passengers. It is connected to the main drive gear by pulleys. The chain helps the escalator run smoothly, at the same speed as the steps. There are four sections of the escalator chain. The center section is known as the “slider.” It is made from cotton or synthetic textile, and the rest is made of a steel cable or flat steel tape.
The treads of the escalator chain must be extruded or die-cast aluminum. The treads should be ribbed to provide maximum traction. They must be finished in the same manner as the combplates. The motor and drive mechanism of the escalator shall be installed at the upper end of the truss or outside the truss envelope in the upper head section. The steps must be capable of supporting a load of 450 kg/m2, and the top surface must be flat, even, and channeled in the direction of movement.
The escalator chain carries the weight of travelers and steps. This is different from the regular chain, which carries the weight of passengers. Step chains have a larger pin diameter than a regular chain. They are also made to be more durable. Step chains are also designed with tight coordination between the chain links and step chains, reducing the noise during the ride. They are also lubrication-free, which makes them ideal for quiet environments.
The replacement of the escalator chain is a complicated and technical process. Normally, it requires two people to complete the work. It is essential to remove the apron and cover plates before starting the replacement process. Once the apron and cover plates are removed, the replacement step chain can be installed in place. The new chain must also be connected to a guide chain around the big one. The entire process takes about a day.
Lubrication
Escalator chains are prone to corrosion and deterioration due to the sea air, sand and pollution that they are exposed to. The use of dry lubricants can help extend the life of the chain and save on oil costs. This also frees up the maintenance team’s time and improves uptime.
The escalator chain is made up of three parts: the transmission member, the inner link plate, and the chain bearing. Each of these components is connected by an axis pin. The axis pin passes through the inner link plate and connects with the sleeve and chain bearing. The external chain plate is connected to the chain bearing through a sleeve. The chain bearing (10) is placed between the sleeve.
In prior art, the chain was lubricated by steel pins and bushes. However, the present invention provides a material combination that results in the optimal combination of hardness and stainlessness of the link pins and bushes. Furthermore, it improves the tribological system by reducing the roughness of the bushes.
Generally, a lubricant should be selected that is able to penetrate the critical internal surfaces of the chain and maintain an effective film. The recommended viscosity is listed in Table 1. The lubricant should also be clean and free from contaminants. A good quality, non-detergent petroleum base oil is suitable. It should not contain any additives that can increase the viscosity.
Noise
Escalator step chains can be noisy, especially when they move at high speeds. There is also a risk of metals clanging together, so it’s important to lubricate these chains properly. However, some newer models of escalators feature low-noise chains, which can make them more suited for quiet environments. It’s important to look for a chain with excellent wear resistance as well.
Noise from escalator chain causes discomfort and can reduce your experience of the escalator. This is because the escalator’s chains are made from a metal alloy that is sensitive to the vibration. A chain that is made from stainless steel is recommended, since it is more resistant to noise.
The pitch of the chain wheel is another component that can cause noise. The number of teeth on the wheel is important for reducing entry noise. However, the number of teeth on a chain wheel can be small, which could cause high stresses. This would require dimensionalizing the wheel and would be expensive.
The latest escalator safety standards have a requirement for escalators with safety features. This includes lockable stop switches, skirt deflection devices, and sensors to detect faults. The safety devices must meet the latest edition of ASME A17.1. They should also include dual profile brushes with anodized aluminum receptacles. Lastly, they must have a fault indication, which will remain visible until the fault is reset. The data gathered from these sensors must be transmitted to a remote monitoring location.
It’s important to maintain the escalator drive chain properly. It can be a source of noise for users, so it’s important to adjust the pitch of the chain to minimize the effects of it.