The piano descent device is a kind of descent device configured on the vertical piano key cover and grand grand piano cover, which adopts the hydraulic damping principle and is mainly made of metal, plastic and damping grease (hydraulic oil). Most pianos manufactured by domestic and foreign piano enterprises are equipped with this device to make the piano cover fall slowly, so as to prevent the fingers of piano players, especially piano children, from being injured.
There are two types of piano retarders: built-in and external ones. From the manufacturer, there are domestic piano retarders and imported piano retarders. According to the structure, it can be divided into two types: integrated type (fixed with the piano cover, and reset with the cover when the cover is opened) and split type (separated from the piano cover, and reset with the built-in spring after the cover is opened). It is mainly made of metal, plastic, damping grease (hydraulic oil) and other materials, and its surface is chrome plated and titanium plated. A few years ago, it may be related to the technology of the piano descent device manufacturer or the assembly process of the piano manufacturer. After two or three years of use, the piano descent device is prone to failure without buffer, or cause the piano cover or piano side plate to crack. At present, the quality of the descent device produced in China has been greatly improved, and the failure rate has been greatly reduced. Its function is to let the piano cover fall slowly after installation, so as to protect the fingers of the player, reduce noise and protect the piano. The principle is that free vibration and attenuation are used to simultaneously play the role of various friction and other obstacles. Nowadays, many products use such devices to adjust and reduce vibration.
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Post time: Nov-23-2022
