Elevator doors have two major types, manual and automatic. Manual doors are normally opened and closed manually by hand, and automatic doors are the standard type of doors found in modern days elevators, usually powered by a door operator.
Non-automatic/manual doors
Automatic doors
Elevator Door System,Liftshop Elevator Door Systems,Elevator Door Locking System,Automatic Elevator Door System Suzhou Keffran Parts Co.,ltd , https://www.keffran-elevatorsmart.comWhat Are the Functional Requirements for Motor Bearing Grease?
Motor bearing grease plays a critical role in ensuring smooth and efficient operation of electric motors. It is essential that the grease meets several key functional requirements to maintain performance, durability, and reliability over time.
1. **Good Adaptability**: The grease should be suitable for use in a wide range of temperatures, from extremely cold to very hot environments, making it versatile for different geographic regions and applications.
2. **Excellent Lubricity and Wear Resistance**: The grease must provide effective lubrication without drying out, emulsifying, or losing its consistency. It should not contain excessive solid particles that could damage the bearings.
3. **Strong Oxidation Resistance**: After prolonged use, the grease should resist degradation, maintaining its color and acidity levels to prevent premature failure.
4. **Good Fluidity**: It should remain fluid within the typical operating temperature range of -25°C to 120°C, ensuring proper lubrication and low starting torque.
5. **Effective Rust and Corrosion Protection**: The grease should offer strong resistance to rust and salt spray, as well as good water resistance, making it ideal for harsh working conditions.
6. **Insulation Class Compatibility**: It should meet insulation classes A, E, or B and avoid containing sulfur or chlorine-based extreme pressure additives that could interfere with electrical performance.
7. **Long Service Life**: High-quality grease can extend the maintenance interval, reduce repair costs, and improve overall system efficiency.
8. **Appropriate Consistency**: The grease should have the right viscosity to provide damping effects, reducing noise and vibration, which contributes to a more environmentally friendly operation.
In addition to these core requirements, motor bearing grease should also be compatible with the specific materials used in the bearings and should not cause any chemical reactions that could compromise performance. Choosing the right type of grease is crucial to ensuring the longevity and efficiency of the motor.
For more information on bearing technology and maintenance, check out related articles such as "Ways to Rescue Rolling Bearing Rings," "Selection of Industrial Bearings," and "Types of Damage in Sliding Bearings."
This article was originally published on China Bearing Network at http://www.chinabearing.net. Please visit the site for more detailed content and updates.
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These doors are normally opened or closed manually using hands, although some of them close automatically. Most older and small European elevators from the 1950's to 1970's are using manual hinged door (similar to normal room doors), while the inside has a manual sliding scissor gate or often there is no door at all. For manual doors, sometimes the door can be spring loaded so the gate can't be left open, or the gate can automatically close when you press the button, and partly/completely close when the elevator gets to a floor. The inside door can also be a tubular gate, which is a gate that in many cases folds around the side of the cab when it is open (often called a barred gate by elevator enthusiasts, though this is likely not the actual term), and which can be automatic or manual.
These type of door is still used today, normally for smaller wheelchair lifts or home elevators. Some older freight elevators may have a horizontal or vertical manual doors. In some Asian countries, one may find an old freight elevators with manual accordion or scissor gate. Some old elevators may have a semi-manual doors a configuration of manual door outside and an automatic door inside.
Automatic doors are the standard type of doors found in modern days elevators which was introduced in 1887. Almost all the automatic doors are usually powered by a door operator installed on the elevator car. Those except manual door with automatic door opening/closing device and all the incline elevators with every independent door operator belongs with every single shaft doors and car doors.
What are the functional requirements for motor bearing grease?
Source: China Bearing Network | Date: June 30, 2013