Usually, the indicator light behind the forklift consists of red brake light, red width indicator light, yellow turn signal light and white reversing light. In order to meet the aesthetic requirements of the appearance of the whole vehicle, the rear indicator light of sf160 heavy lift truck produced by Shantui has only two colors: red and yellow. It is only equipped with red brake light, red width indicator light and yellow steering light, but not white reversing light.
Its reversing indication function is realized by two rear working lights behind the cab, that is, the working lights are reversing lights in the daytime and rear lights at night. This design is based on the heavy lift truck, which is mostly used for port container loading and unloading. The forklift does not use the rear work light for daytime operation, and the rear work light is just used as the reversing light. At night, the light in the port is relatively dim. When forklift operation, the front and rear work lights must be turned on to ensure operation safety.
The control principle of the rear working light of the forklift is shown in the attached figure. It is mainly composed of mode change-over switch 1, transmission electronic control unit 2, backup relay 3, battery 4, fuse (5, 10, 12), rear working light (6, 7), backup buzzer 8, working light switch 9, headlamp combination switch 11, etc. Its working process is as follows:
When the forklift operates in the daytime, the mode change-over switch 1 shall be set to the daytime gear (i.e. 1 and 5 are closed). When reversing, the transmission electronic control unit 2 sends a low level to the coil of the reversing relay 3, and the main contacts of the reversing relay 3 are closed (i.e. 30 and 87 are closed). The current flows from the positive pole of battery 4 through fuse 5, the main contact of backup relay 3 and the contact (1 and 5) of mode change-over switch 1 to rear work lights 6 and 7, and then returns to the negative pole of battery 4 to form a circuit. At the same time, the two rear work lights 6 and 7 are on, and the reversing buzzer 8 is on.
When the forklift operates at night, the mode change-over switch 1 should be in the night gear (i.e. 7 and 5 are closed), and the work light switch 9 should be closed at the same time. At this time, the current flows from the positive pole of battery 4 through fuse 10, contacts (1 and 5) of work lamp switch 9 and contacts (7 and 5) of mode change-over switch 1 to rear work lamps 6 and 7, and then returns to the negative pole of battery 4 to form a circuit. At this time, no matter whether the forklift is reversing or not, the two rear work lights 6 and 7 are always on to play the role of lighting.
When 9 and 9 reversing switches work at night, there is no buzzer, and only 2 reversing lights will sound at night. If the night mode change-over switch 1 is in the daytime gear (i.e. 1 and 5 are closed), the rear work lights 6 and 7 are only on when reversing.
In addition, in order to facilitate the driver to see the working state of each switch when working at night, indicator lights are set on work light switch 9 and mode change-over switch 1. When the headlamp combination switch 11 is in the width indicating gear, the front and rear width indicating lights of the forklift are on, and the indicator lights on the work light switch 9 and the mode change-over switch 1 are also on.
