Abstract: A coating liquid for preparing a needle-shaped cylinder liner, comprising the following components: 0.05-0.4 parts of an anionic surfactant; 0.05-0.5 parts of tannic acid; 0.15-0.7 parts of caustic soda; 22-38 parts of diatomite; 3-10 parts of montmorillonite; and 62-75 parts of water. A method for preparing a needle-shaped cylinder liner comprises spraying a coating liquid for preparing the needle-shaped cylinder liner onto the inner wall of a hollow cylindrical mould, and drying the coating liquid to obtain a mould with a coating attached to the surface of the inner wall; adding an inoculated iron liquid into the rotary mould, and cooling and demoulding to obtain a cylinder liner blank; and subjecting the blank to outer surface cleaning and forming machining to obtain the needle-shaped cylinder liner.

Abstract: A thermal spraying device includes an electric arc spraying device, a rotatable worktable, spraying tools, wire placing racks and a master controller. The electric arc spraying device is arranged at a periphery of a rotatable worktable, the spraying tools are arranged on the rotatable worktable in a circumference direction, and each of the spraying tools is driven to rotate by a motor. The wire placing racks are arranged at an outside of the rotatable worktable, and each of the wire placing racks corresponds to one electric arc spraying device. The master controller is connected to the rotatable worktable to control the rotatable worktable. Compared with a handheld electric arc spraying gun, the spraying efficiency and the stability of the spraying quality are improved. A thermal spraying device having the electric arc spraying device is further provided.

Abstract: A coating liquid for preparing a needle-shaped cylinder liner, comprising the following components: 0.05-0.4 parts of an anionic surfactant; 0.05-0.5 parts of tannic acid; 0.15-0.7 parts of caustic soda; 22-38 parts of diatomite; 3-10 parts of montmorillonite; and 62-75 parts of water. A method for preparing a needle-shaped cylinder liner comprises spraying a coating liquid for preparing the needle-shaped cylinder liner onto the inner wall of a hollow cylindrical mould, and drying the coating liquid to obtain a mould with a coating attached to the surface of the inner wall; adding an inoculated iron liquid into the rotary mould, and cooling and demoulding to obtain a cylinder liner blank; and subjecting the blank to outer surface cleaning and forming machining to obtain the needle-shaped cylinder liner.