Door closing device

Abstract

The invention adopt the combination operation between door pivot, action sliding cylinder, shutdown spring, oil supply tube and door closer, and the corresponding transmission between teeth set at outside of action sliding cylinder and door pivot. The one end of action sliding jar is against the shutdown spring, and the oil hydraulic cylinder bore and relevant sliding piston are set in action sliding cylinder. Both end of the piston has piston axis that is threading out. The end of piston axis has an oil supply tube, and hydraulic oil fills in the hydraulic cylinder bore and oil supply tube. The invention can reduce amount of filling hydraulic oil, and can prevent aluminum die-casting body from oil dripping.

Description

technical field [0001] The invention relates to a novel door closer used in door and window structures, in particular to an auxiliary buffer structure used in various door and window structures. Background technique [0002] At present, the common door closer structure on the market is to use the cylindrical body filled with hydraulic oil as the operating space for other components. The hydraulic cylinder door closer will be spaced between the door panel and the door frame, and the spring in the cylindrical body will be used to close the door. Elastic, and use the hydraulic oil in the cylindrical body to produce a buffer effect; this kind of conventional hydraulic door closer structure has long been used in various door switch buffer equipment, but its structure still produces the following problems when it is in use : [0003] First, the hydraulic oil of commonly used door closers is filled in the entire internal space of the body, and the body is formed by aluminum die-ca...

AI Technical Summary

Problems solved by technology

[0003] First, the hydraulic oil of commonly used door closers is filled in the entire internal space of the body, and the body is formed by aluminum die-casting. Therefore, in order to prevent oil leakage caused by air holes in the body of the door closer, the manufacturer must In the process of filtering aluminum soup for many times and using vacuum die-casting technology to form, and in the process of forming the door closer body and after completion, it is necessary to carry out multiple inspections in order to eliminate the door closer body containing air holes, so this commonly used product The production cost is relatively high. On the other hand, the phenomenon of air holes in the body of this commonly used product cannot be completely eliminated, so after a period of use, it is often found that the door closer has oil leakage.

[0004] Second, the hydraulic oil filled in the body of the commonly used door closer must use easy-flowing hydraulic oil, so the friction surface of the internal piston and the hydraulic cylinder must be made with high-precision hole and shaft tolerances to prevent the easy-flowing hydraulic oil in the oil Leakage occurs between the inner wall of the cylinder and the outer wall of the piston, resulting in poor closing buffer

The inner wall of the hydraulic cylinder of the conventional door closer is directly processed by the aluminum die-casting body, and the inner wall of the hydraulic cylinder formed by the aluminum die-casting body is easy to wear and tear. Therefore, after a period of use, common door closers often have poor closing buffer.

[0005] Third, the commonly used door closers do not have a supplementary oil cylinder device, and the hydraulic oil is filled in the entire internal space of the body. Because the easy-flowing hydraulic oil is easy to evaporate, the commonly used door closers will have poor closing buffer due to insufficient oil after a period of use. Phenomenon

[0006] Fourth, the hydraulic oil of the commonly used door closer is filled in the internal space of the body, resulting in a large amount of hydraulic oil filling in the body of the door closer, and the hydraulic oil that is easy to flow and leaks is also likely to become a terrible combustion aid in the event of a fire. Products, especially the general door closers are installed at the entrance and exit of personnel, so filling the door closer with too much hydraulic oil will also cause safety concerns. Because the common hydraulic door closers have the above problems, the current research and development has been towards Reducing the amount of hydraulic oil to fully prevent leakage, preventing the inner wall of the hydraulic cylinder from wearing out, installing an oil replenishment device, and reducing costs require efforts, and the above goals are also the motivation for the inventor of this case to develop the structure of this case

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