Cross rail structure for OHT system and OHT system using the same

An OHT system comprising:

• a cross rail structure for an OHT system, that is an intersection point at which two orthogonal rails among rails that are installed in the OHT system and transport vehicles intersect with each other,
• wherein the cross rail structure includes:
• a pair of auxiliary rails that are installed at substantially the same height as a rail at the intersection point at which the two orthogonal rails intersect with each other, and disposed parallel to each other at a predetermined distance;
• a movement unit that moves the pair of auxiliary rails up and down;
• a rotation unit that rotates the pair of auxiliary rails so that the pair of auxiliary rails are disposed in any one of two directions orthogonal to each other;
• and
• a distance holding unit that holds a distance between the pair of auxiliary rails without an interference with the transport vehicles,
• wherein the movement unit includes:
• a moving part frame that has a plate shape and is disposed above the pair of auxiliary rails and fixed to the rail by a frame arm,
• a piston that is installed at the moving part frame and is a hydraulic device, and
• a piston arm that has one end coupled with the piston and the other end coupled to the pair of auxiliary rails;
• and
• a control unit that controls the movement unit and the rotation unit of the cross rail structure for an OHT system.

A cross rail structure for an OHT system, that is an intersection point at which two orthogonal rails among rails that are installed in the OHT system and transport vehicles intersect with each other, the cross rail structure comprising:

• a pair of auxiliary rails that are installed at substantially the same height as a rail at the intersection point at which the rails intersect with each other, and disposed parallel to each other at a predetermined distance;
• a movement unit that moves the pair of auxiliary rails up and down;
• a rotation unit that rotates the pair of auxiliary rails so that the auxiliary rails are disposed in any one of two directions orthogonal to each other;
• and
• a distance holding unit that includes a first member that has a plate shape and is disposed above the pair of auxiliary rails and a pair of second members that extend downward from both ends of the first member and are coupled to the pair of auxiliary rails, and holds a distance between the pair of auxiliary rails without an interference with movements of the transport vehicles;
• and
• a vehicle detection sensor that is installed at a certain distance from a cross rail among the rails, detects a vehicle entering the cross rail, and is an infrared sensor, four vehicle detection sensors being installed around the intersection point,
• wherein the movement unit includes:
• a moving part frame that has a plate shape and is disposed above the pair of auxiliary rail and fixed to the rail by a frame arm,
• a pair of pistons that are installed at the moving part frame and are hydraulic devices,
• a piston arm that has one end coupled with the pair of pistons and the other end coupled to the pair of auxiliary rails, and
• a rotating part frame that has a plate shape and has both ends respectively coupled to the pair of pistons,
• wherein the moving part frame is provided with a guide hole that is an arc-shape through-hole,
• wherein the guide hole is disposed so that the piston arm penetrates the guide hole, and
• wherein the rotation unit is a motor that is fixed to the moving part frame, and rotates the pair of pistons coupled to the rotating part frame and the pair of auxiliary rails together by rotating the rotating part frame.