| 摘要 |
New railroad rail frog controllers are disclosed. The rail frog controller has a collapsible and expandable housing having a rail frog wing rail connection portion and a stationary connection portion. The housing has a first expansion stage and a subsequent second expansion stage. A piston head is slidably positioned within a pressure tube in the housing. The pressure tube has first and second fluid chambers on opposite sides of the piston head. A first fluid flow regulator fluidly connects the first and second fluid chambers together, and controls fluid flow between the first and second fluid chambers during the first expansion stage. A second fluid flow regulator fluidly connects the first and second fluid chambers together, has a higher fluid flow rate capacity than the first fluid flow regulator, and controls fluid flow between the first and second fluid chambers during the second expansion stage. A third fluid flow regulator fluidly connects the first and second fluid chambers together, and has a fluid closed position during expansion of the housing and a fluid open position during collapse of the housing. A third fluid chamber is on the outside of the pressure tube. The third fluid chamber is fluidly connected to the second fluid chamber by a fourth fluid flow regulator, particularly a high pressure relief valve. When excessive high actuation velocities occur during expansion, the fourth fluid flow regulator will be in a fluid open position after the fluid pressure in the second fluid chamber exceeds the required pressure to open the fourth fluid flow regulator. The fourth fluid flow regulator will subsequently close upon reduction in fluid pressure within the second fluid chamber. |
