Use, maintenance and repair of door closers

When the newly installed door closer is used for about one week to 10 days, all screws should be checked and re-tightened.

Use the hydraulic oil recommended by the manufacturer, and use hydraulic oil with a low freezing point for cold regions.

After the door closer is put into use, it should be inspected regularly. The contents of the inspection are: whether the installation screws are loose and lost, whether the connecting arm rubs against the door body or door frame, whether the door body is deformed and loose, the cushioning effect of closing the door, and the support guide. Whether the parts are leaking oil, etc.

Usually the following problems will appear after the door closer is used for a period of time:

1) The mounting screws are loose or lost, resulting in the door closer not being in the correct installation position and the connecting arm being damaged;

2) When the door closer is closed, the cushioning effect becomes poor, resulting in impact between the door and the door frame, and deformation of the door body;
From a structural point of view, the door closer is a closed whole, and its quality is basically invisible from its appearance. the

The most critical quality issue of the door closer is whether there is oil leakage, because the door closer relies on the throttling of the fluid in its internal hydraulic system to realize the control of the door closing process. Oil leakage means the failure of the hydraulic system, so the hydraulic system is The only criterion that determines the service life of the door closer. the

The main cause of oil leakage is that the wear of the pinion supporting guide increases the gap, the wear of the sealing ring causes the sealing effect to decrease, or the throttle spool rotates counterclockwise to leave the valve body when adjusting the buffer effect. the

The reduction of the cushioning effect of the door closer is caused by the entry of air caused by oil leakage or the increase of the fit (throttling) gap between the rack plunger guide cylinder and the valve body. Therefore, the quality and precision of pinion, support guide material, heat treatment and machining are very important. the

For door closers with poor cushioning effect, throttling by adjusting the throttle spool alone cannot solve the problem fundamentally. Maintenance must be done. If there is oil leakage at the support guide, remove the support guide and check the condition of the seal ring. If it is worn or aging, replace the seal ring. If the gap between the support guide and the pinion shaft is too large, replace the support guide. If the guide cylinder of the rack plunger is worn and the fit gap between the valve body increases and the throttling effect decreases, the rack plunger can be removed and repaired by chrome plating on the surface. In addition, in the case of ensuring the cushioning effect of the door closer, switching to a softer spring is also a way to reduce the impact force of the door on the door frame due to the deterioration of the cushioning effect.