Wallboard with self-locking function and pre-expansion space

A wallboard with a self-locking function and a pre-expansion space, comprising:

• an upper board surface, a lower board surface, a left edge, a right edge, a front edge, and a rear edge, the upper board surface and the lower board surface being parallel to each other, the left edge and the right edge being parallel to each other, the front edge and the rear edge being parallel to each other, wherein the left edge, the right edge, the front edge, or the rear edge is provided with a first strip-shaped groove therealong;
• a corresponding edge parallel to the edge provided with the first strip-shaped groove is provided with a strip-shaped bulge;
• a self-locking structure matched with an insertion strip is positioned on the strip-shaped bulge and the first strip-shaped groove;
• a lower part of the strip-shaped bulge is an inclined surface, and an angle between the inclined surface and a lower surface of the strip-shaped bulge is an acute angle;
• an upper part of the strip-shaped bulge is a vertical surface;
• a second strip-shaped groove is provided in a position, adjacent to the inclined surface, of the lower board surface;
• two side edges of the second strip-shaped groove are both provided with inclined structures and have a same inclination angle as the inclined surface;
• a width between a bottommost position of the inclined surface and an outermost side of the strip-shaped bulge is less than a depth of the first strip-shaped groove;
• a width between the vertical surface and the outermost side of the strip-shaped bulge is greater than the width between the bottommost position of the inclined surface and the outermost side of the strip-shaped bulge;
• and a thickness of the strip-shaped bulge in an up-down direction is less than a width of the first strip-shaped groove in the up-down direction;
• wherein a step is arranged on an outermost side of a lower part of the first strip-shaped groove;
• the insertion strip is arranged on the step and is fixed to the step by a plurality of springs;
• an upper part of the insertion strip protrudes into the first strip-shaped groove in a natural state of the springs;
• and a strip-shaped clamping groove matched with the insertion strip is provided in the lower part of the strip-shaped bulge;
• wherein a plurality of guide and limit columns are located on the step and are in a one-to-one correspondence with the plurality of springs;
• a plurality of guide holes in a one-to-one correspondence with the guide and limit columns are located in the insertion strip and sleeved on the guide and limit columns;
• the springs are sleeved on the guide and limit columns and located between the insertion strip and the step;
• and the springs have lower parts fixedly connected to the step and upper parts fixedly connected to the insertion strip.