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1. A locking mechanism, comprising at least one splicing assembly, wherein the splicing assembly comprises at least two splicing blocks, a limiting protruding block, a fixing base and a locking screw rod, and the splicing blocks are configured for mounting on a housing supporting a display panel; the locking screw rod is vertically arranged on one side of the fixing seat close to the splicing block; and the locking screw rod is configured for connecting with the splicing block, such that the fixing base is abutted against the limiting protruding block; wherein the number of the splicing block is four, and adjacent two splicing blocks are close to each other; a limiting hole is formed on the fixing base, four splicing blocks are all abutted against the fixing base, four limiting protruding blocks all pass through the limiting hole, and the four limiting protruding blocks are all abutted against a side wall of the limiting hole; and wherein the fixing base is provided with a reinforcement assembly, wherein the reinforcement assembly comprises a snap bead and a spring, a sliding groove in communication with the limiting hole is formed on the fixing base, the snap bead is slidable in the sliding groove, and a slot is formed on the limiting protruding block for snap-fitting with the snap bead; and one end of the spring away from the snap bead is connected to the bottom wall of the sliding groove.
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