Parallelogram linkage automatic clamping holder

A parallelogram linkage automatic clamping holder, comprising a rear base, a bottom support arm mounted to the rear base, a left clamping arm and a right clamping arm connected to two sides of the bottom support arm, a return elastic member being provided and fixed to the rear base, the return elastic member extending in a vertical direction and being used for linking the bottom support arm to return upward, one end of the return elastic member being fixed to the rear base, another end of the return elastic member being connected to the bottom support arm;

• the left clamping arm and the right clamping arm each including a clamping part, a first connecting rod, and a second connecting rod;
• the bottom support arm being provided with a first fulcrum and a second fulcrum arranged vertically and spaced a distance apart from each other corresponding to the left clamping arm and the right clamping arm, the clamping part being provided with a third fulcrum and a fourth fulcrum arranged vertically and spaced a distance apart from each other;
• inner and outer ends of the first connecting rod being pivotally connected to the corresponding first fulcrum and the third fulcrum respectively, inner and outer ends of the second connecting rod being pivotally connected to the corresponding second fulcrum and the fourth rotation fulcrum respectively, the first fulcrum, the second fulcrum, the fourth fulcrum and the third fulcrum being sequentially connected to form a parallelogram structure;
• the parallelogram linkage automatic clamping holder further comprising two limit portions for providing the left clamping arm and the right clamping arm with deformation fulcrums respectively, the two limit portions being fixed to the rear base.