Before selecting the automatic hermetic door products, it should consider: door weight, door width, door opening frequency, use requirements and use environment, etc. Door weight and door width are the premise of selecting the model of door closer. Generally, the model with small door weight and small force is selected. The door closer is required to have good sealing performance and no oil leakage. The key is the technology and material of dynamic sealing; The service life of the door closer shall be long, so as to ensure long-term and normal use after installation, reduce the workload and cost of maintenance and renewal, and feel the convenience and enjoyment brought by the automatic hermetic door products.

Opening resistance is a very important function for building exterior doors. The automatic hermetic door products shall not only prevent the movable fan from being excessively opened due to the large thrust of people, but also prevent the door body from being damaged if the movable fan is excessively opened due to strong wind. Generally speaking, only high-grade door closer can have this function. Lagging door closing is a special function. The purpose is to make the movable fan stay in the open position for a period of time and then close the door. This function is very important when children and the elderly pass through.

The adjustable door closing force is the symbol of high-grade automatic hermetic door products, which can accurately adjust the door closing force level. Door closing force is usually the specific performance of a certain type of door closer, but sometimes the door closing force will also change. For example, when the wind is strong in winter, the outer door may need a large door closing force. When the wind is small in summer, the door closing force is small, which makes it easier for people to open the movable fan.

Automatic hermetic door products must meet the national standard gb9305-88. The factors that should be considered in selecting the door closer include the weight of the door, the width of the door, the opening frequency, the use requirements and the use environment. The weight of the door and the width of the door are the main factors in selecting the model of the door closer. The common doors include fire doors, wooden doors, aluminum alloy doors, glass doors, steel doors, etc. Usually, if the weight of the door is small, choose the model with less force, and vice versa. The door opening frequency is closely related to the product quality. For the occasions where it is used frequently, the product should have good sealing performance and long service life.

The key quality problem of the automatic hermetic door products is whether there is oil leakage, because the door closer completely relies on its internal hydraulic system to control the automatic hermetic door process. Oil leakage means the failure of the hydraulic system. Therefore, the hydraulic system is the only standard to determine the service life of the automatic hermetic door products. The main reason for oil leakage is that the bearing transmission device has a gap due to wear, which reduces its sealing effect. Therefore, the material, heat treatment and machining quality and accuracy of bearing transmission device are the key to the problem. In fact, the quality of door and window hardware and even all building hardware is related to the basic industrial level of the production place. The shell of automatic hermetic door is made of cast aluminum and cast iron. The size, quantity and post-treatment of rough sand holes in the shell are also one of the key factors affecting the quality of automatic hermetic door products.

Before selecting the automatic hermetic door products, it should consider: door weight, door width, door opening frequency, use requirements and use environment, etc. Door weight and door width are the premise of selecting the model of door closer. Generally, the model with small door weight and small force is selected. The door closer is required to have good sealing performance and no oil leakage. The key is the technology and material of dynamic sealing; The service life of the door closer shall be long, so as to ensure long-term and normal use after installation, reduce the workload and cost of maintenance and renewal, and feel the convenience and enjoyment brought by the automatic hermetic door products.

Opening resistance is a very important function for building exterior doors. The automatic hermetic door products shall not only prevent the movable fan from being excessively opened due to the large thrust of people, but also prevent the door body from being damaged if the movable fan is excessively opened due to strong wind. Generally speaking, only high-grade door closer can have this function. Lagging door closing is a special function. The purpose is to make the movable fan stay in the open position for a period of time and then close the door. This function is very important when children and the elderly pass through.

The adjustable door closing force is the symbol of high-grade automatic hermetic door products, which can accurately adjust the door closing force level. Door closing force is usually the specific performance of a certain type of door closer, but sometimes the door closing force will also change. For example, when the wind is strong in winter, the outer door may need a large door closing force. When the wind is small in summer, the door closing force is small, which makes it easier for people to open the movable fan.

Automatic hermetic door products must meet the national standard gb9305-88. The factors that should be considered in selecting the door closer include the weight of the door, the width of the door, the opening frequency, the use requirements and the use environment. The weight of the door and the width of the door are the main factors in selecting the model of the door closer. The common doors include fire doors, wooden doors, aluminum alloy doors, glass doors, steel doors, etc. Usually, if the weight of the door is small, choose the model with less force, and vice versa. The door opening frequency is closely related to the product quality. For the occasions where it is used frequently, the product should have good sealing performance and long service life.

The key quality problem of the automatic hermetic door products is whether there is oil leakage, because the door closer completely relies on its internal hydraulic system to control the automatic hermetic door process. Oil leakage means the failure of the hydraulic system. Therefore, the hydraulic system is the only standard to determine the service life of the automatic hermetic door products. The main reason for oil leakage is that the bearing transmission device has a gap due to wear, which reduces its sealing effect. Therefore, the material, heat treatment and machining quality and accuracy of bearing transmission device are the key to the problem. In fact, the quality of door and window hardware and even all building hardware is related to the basic industrial level of the production place. The shell of automatic hermetic door is made of cast aluminum and cast iron. The size, quantity and post-treatment of rough sand holes in the shell are also one of the key factors affecting the quality of automatic hermetic door products.