four piece left and right sliding blackboard, with two movable blackboards in front and four pulleys on each movable board. There are two fixed blackboards at the back that are fixed and immovable. The middle of the fixed board is reserved space for a monitor. If the monitor is not high enough for the blackboard, it can be configured on a decorative board of the same color as the blackboard and fixed on the frame of the two fixed boards. When the front two sliding boards are pushed to the middle, they can be closed and locked with a lock to protect the monitor. Push pull blackboard, also known as composite blackboard, is a popular new type of writing board in schools around the world in recent years. The surface of the push pull blackboard is the same as that of a regular teaching blackboard, but after pushing open the two boards that are blocked outside, an interactive electronic whiteboard or LCD touch TV appears, which can achieve electronic teaching. The biggest function of the push pull blackboard is to combine traditional teaching with modern teaching - switching between the writing board and the electronic whiteboard freely, safe and convenient. Features of the push-pull combination integrated board product: 1. Embedded design, reasonable use of space. The whiteboard is embedded in the teaching green board frame, with a solid and reasonable structure, simple and elegant; Reasonably expand the use area of green boards, effectively utilize space, and facilitate the overall layout of classrooms. 2. The push-pull track facilitates the switching of the board surface. Based on the distribution of classroom lines and the projection lifting position, the placement position of the electronic whiteboard in the frame (left, center, right) should be reasonably determined. The frame adopts a push-pull track, which can easily pull the outer green board to switch between the electronic whiteboard and the green board, making it simple and convenient; Install anti-collision rubber washers on both sides of the push-pull green plate to reduce impact force and noise