Self-closing door spring hinge (the practice of KFC bathroom self-closing door)

Expanding the article on the practice of self-closing doors in KFC bathrooms can be done by providing more detailed information and explanations about the different methods and materials used to achieve an invisible door. Additionally, you can discuss the benefits and drawbacks of each method, as well as provide examples and recommendations for the installation process.

Here is an expanded version of the article:

"The practice of using self-closing doors in KFC bathrooms has become increasingly popular in recent years. These doors provide convenience and enhance the overall experience for customers. In this article, we will explore several methods of achieving an invisible door, discussing the materials used, different closing mechanisms, and installation options.

When it comes to hiding the door, there are various materials that can be used. One option is to paste wallpaper over the door, which allows it to blend seamlessly with the surrounding walls. Another option is to use plasterboard, which can be painted or textured to match the overall design of the bathroom. Wood veneer is also a popular choice for achieving a more natural and luxurious look.

In terms of closing mechanisms, there are several options available. One common choice is a door closer, which uses a hydraulic system to control the speed and force of the door closing. This ensures a smooth and controlled closing motion, preventing any noise or accidents. Another option is a hydraulic hinge, which provides similar benefits but is integrated into the door itself. This eliminates the need for a separate closer and creates a sleeker and more minimalist appearance. Lastly, a touch bead can be used, which activates the closing mechanism when the door is pushed or pulled.

The installation method of the door can also vary depending on the space and design preferences. For instance, a horizontal opening door can be used, which swings open and closes like a traditional door. A sliding door is another option, which allows for space-saving and seamless movement within the bathroom. Additionally, a revolving door can be installed, which adds a unique and stylish touch to the overall design.

Now, let's discuss the phenomenon of the door shaft hinge in cabinet doors. The cabinet door is installed obliquely to ensure automatic closing after opening. There are a few reasons for this. Firstly, the cabinet body itself may not be perfectly vertical, causing the door to slowly close under the influence of gravity. Secondly, the door hinge used is a self-closing door hinge with buffer damping. This hinge is designed to keep the door closing slowly under the elastic force of the hinge, preventing any damage or injuries. It also maintains an appropriate inward closing force, ensuring the door stays closed securely.

In mechanics, the concept of moment of force about the axis can be applied to explain the functionality of the self-closing door hinge. The torsion spring within the hinge generates power by twisting and deforming, resulting in a piston moving back and forth in the oil cylinder. This generates a buffer force that controls the closing motion of the door. However, it's important to note that hydraulic hinges have their drawbacks, including their size, potential oil leakage, and decay of closing force over time. There are alternatives available, such as pneumatic hinges, which offer similar door-closing functions with better performance and cost-effectiveness.

To summarize, the practice of utilizing self-closing doors in KFC bathrooms is a great way to improve the overall customer experience. By using invisible door methods, such as various materials, closing mechanisms, and installation options, KFC ensures a seamless and functional bathroom design. The phenomenon of the door shaft hinge in cabinet doors can be explained through the concept of moment of force about the axis. It allows the doors to close automatically after opening, providing convenience and safety. For those looking for a reliable and efficient closing mechanism, pneumatic hinges are recommended due to their superior performance and cost-effectiveness."

In conclusion, the expanded article provides more comprehensive information about the different methods and materials used to achieve invisible doors, as well as explaining the phenomenon of the door shaft hinge in cabinet doors. It also introduces alternative options, such as pneumatic hinges, for those seeking a more reliable and cost-effective closing mechanism. The overall word count of the expanded article is higher than the original, providing more detailed insights and explanations for readers.