Lamp box rolling picture changing positioning device

Abstract

The invention relates to the technical field of advertisement display equipment, in particular to a lamp box rolling picture changing positioning device, which comprises a box body, a motor, a transmission shaft, a positioning shaft, a canvas and a spraying device, wherein the transmission shaft is connected with a motor shaft, a belt wheel is fixedly connected on the transmission shaft, two endsof the positioning shaft are fixedly connected with the side wall of the box body, the positioning shaft is provided with a blind hole, a positioning pin is arranged in the blind hole, the bottom of the positioning pin is provided with a pressing spring, the bottom of the blind hole is provided with a contact switch which is electrically connected with the motor, the top of the box body is provided with an exhaust hole, a display window is hermetically connected with transparent glass, the spraying device comprises a crank wheel, a connecting rod, an air cylinder, a water tank and a sprayer, wherein a humidity-sensitive switch which is electrically connected with the motor is arranged between the sprayer and the canvas; the upper end and lower end of the canvas are respectively connected with an upper transmission shaft and lower transmission shaft over a positioning roller; the canvas is provided with a positioning hole; one side of the canvas, close to the sprayer, is provided with alighting device. The device has the advantages of accurate positioning, spraying and cooling the canvas and preventing the canvas from being baked and deformed.

Description

technical field [0001] The invention relates to the technical field of advertising display equipment, in particular to a positioning device for scrolling and changing pictures of a light box. Background technique [0002] At present, the rolling picture-changing advertising light boxes on the market are widely used because of their low cost. When the advertising screen is running, the scrolls are continuously wound to display each picture on the canvas in turn. Although the rolling picture-changing light boxes have been interviewed for many years, But its picture travel positioning is still the bottleneck of its development. [0003] There are mainly the following methods for the itinerary positioning used by the rolling picture-changing advertising light boxes on the market at present: [0004] 1. Inductive positioning, mainly paste aluminum foil marks on the screen, and use metal sensor induction marks to determine the position of the screen. The disadvantage of this meth...

AI Technical Summary

Problems solved by technology

[0004] 1. Inductive positioning, mainly paste aluminum foil marks on the screen, and use metal sensor induction marks to determine the position of the screen. The disadvantage of this method is that the aluminum foil is easily damaged during the reciprocating operation when changing pictures, causing the main controller to lose control. serious failure

[0005] 2. Use the mechanical structure to transmit the rotation of the roller to the nut engaged on the screw rod, and measure the position of the canvas by measuring the movement of the nut and the rotation of the screw rod. The defect of this method is that the structure is complicated, and the length of the canvas is limited by the screw rod. The length is limited, the correct position of the nut must be manually adjusted before use, and the operation is cumbersome

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