Multi-degree-of-freedom automatic center-adjusting device, hydraulic quick-coupling device, and rescue equipment

A multi-degree-of-freedom automatic center-adjusting device, comprising an active coupling valve set, a spring, and a dynamic adjustment swing rack, wherein

• a first end of the dynamic adjustment swing rack is fixed to operation tools, and a second end of the dynamic adjustment swing rack is connected to the active coupling valve set through the spring,
• the dynamic adjustment swing rack comprises a frame, a limit slot, and a spring limit cylinder, wherein
• the frame supports and fixes the active coupling valve set,
• the limit slot defines a limit activity position of the active coupling valve set, and
• the spring limit cylinder constrains the spring,
• wherein the active coupling valve set comprises a hydraulic valve core, a guide sleeve, four limit screws, and a spring limit hole, wherein the spring limit hole is disposed at a back of the hydraulic valve core, the spring limit hole constrains the spring, the four limit screws are respectively mounted to an outer side of the hydraulic valve core, the four limit screws and the limit slot form a constraint relation to jointly constrain a displacement of the hydraulic valve core in an X direction and a Z direction,
• wherein four limit slots form four parallel sides, a distance between two parallel sides of each limit slot is greater than a diameter of each of the four limit screws, wherein the four limit screws move and swing when the hydraulic valve core is subjected to a force, wherein a movement of the four limit screws comprises a forward movement and a backward movement in an X-axis direction, an up movement and a down movement in a Z-axis direction, and a minor movement in a Y-axis direction, and the swing of the four limit screws comprises a circular swing with a Y-axis as an axis of symmetry, a circular swing with a Z-axis as the axis of symmetry, and a minor circular swing with an X-axis as the axis of symmetry.