Adjustable height square outer cover with built-in cylinder

An adjustable height square outer cover with a built-in cylinder, comprising a water tank shell and a square outer cover movably arranged on the water tank shell, wherein the water tank shell is provided with an installation accommodation cavity containing the square outer cover, the water tank shell is also provided with support rack teeth, the square outer cover is provided with a locking release device;

• the locking release device comprises a handle, a pull rod hinged with the handle, a first locking block, a second locking block, at least two first connecting rods and at least two second connecting rods, wherein the first locking block and the second locking block are linked with the pull rod;
• the first locking block and the second locking block are respectively provided with locking release rack teeth matched with the support rack teeth;
• the pull rod is hinged with the first locking block through two parallel first connecting rods, wherein a first parallelogram structure is formed between the pull rod, the first locking block and the two parallel first connecting rods after assembly;
• the pull rod is hinged with the second locking block through two parallel second connecting rods, wherein a second parallelogram structure is formed between the pull rod, the second locking block and the two parallel second connecting rods after assembly;
• a first mounting cavity is provided inside the square outer cover, the first mounting cavity is movably provided with a support configured to adjust laterally relative to the first mounting cavity, the support is movably provided with a cylinder configured to adjust longitudinally relative to the support, and the locking release device is adjusted, wherein the locking release rack teeth and the support rack teeth are out of engagement, wherein a distance of the square outer cover extending out of the installation accommodation cavity is adjusted.