Foldable pressing device and x-ray machine

An X-ray machine comprising:

• a foldable pressing device comprising:
• a motor;
• a lifting member;
• a pressing member;
• and
• a linear guide member comprising a stop position, a pulling member and a resilient member,
• wherein the lifting member comprises a lift driving element driven by the motor and a lift motion element for mating with the lift driving element, the lift motion element having a connecting end pivotally connected to the pressing member in a vertical direction,
• wherein the pressing member comprises a pressing head, a first pressing rod, and a second pressing rod, the pressing head being fixedly connected to a first end of the first pressing rod, a second end of the first pressing rod being connected to a first end of the second pressing rod by a rotary wheel that rotates synchronously with the first pressing rod, a second end of the second pressing rod being connected to the connecting end of the lift motion element by a non-rotary wheel, the second pressing rod being rotatable around the non-rotary wheel within a defined angle range under a working position, a linear guide structure being provided on the second pressing rod in a length direction of the second pressing rod,
• wherein the linear guide member with the stop position comprises a linear guide element used vertically with a position of the linear guide element being fixed, a first sliding element being slidable relative to the linear guide element, a second sliding element being connected to the first sliding element by a rotating shaft, the second sliding element being slidable relative to the linear guide structure on the second pressing rod, an upper end of the linear guide element having a first stop block for restricting a position of the first sliding element,
• wherein the pulling member comprises a first pulling element, a first end of the first pulling element being fixed onto the rotary wheel after having been wound counter-clockwise around the rotary wheel for at least a first defined length, and a second end of the first pulling element being fixed onto the non-rotary wheel after having been wound clockwise around the non-rotary wheel for at least a second defined length, and
• wherein the resilient member comprises a first resilient element and a second resilient element, one end of the first resilient element being fixed onto the second pressing rod, the other end of the first resilient element being fixed onto the lift motion element, thus causing the second pressing rod to be held in the working position relative to the lift motion element under the effect of a resilient force of the first resilient element, one end of the second resilient element being fixed onto the first pressing rod, the other end of the second resilient element being fixed onto the second pressing rod, thus causing the first pressing rod to be held in the same linear relationship with the second pressing rod under the effect of a resilient force of the second resilient element.