Fitting of Pressure Plate Installation Accuracy and Track Circuit Insulation Performance
Q1: What core parameters are included in the installation accuracy of pressing plates?
A1: The core parameters of the installation accuracy of pressing plates include levelness, verticality, fitting gap with rails, bolt installation position and torque, as well as the matching accuracy with under-rail pads and gauge blocks. These parameters jointly determine whether the pressing plate can effectively fix the rail, transmit load and ensure the stability of the track structure.
Q2: What impacts will pressing plate installation deviation have on track geometry?
A2: Tilting pressing plates and excessive fitting gaps will cause vertical and transverse displacement of rails, damaging the vertical and horizontal smoothness of the track; deviation of bolt installation position will lead to uneven stress on pressing plates, causing rail eccentric wear and gauge widening; long-term installation deviation will accumulate into track diseases, affecting the driving smoothness and safety of trains.
Q3: Why do pressing plates in track circuit sections need insulation design?
A3: Track circuits rely on rails to transmit signal current. If the pressing plate is made of metal and directly contacts the rail, it will form a conductive path, damage the insulation of the track circuit, leading to signal short circuit and poor shunt; insulated pressing plates can block current conduction and ensure the normal transmission of track circuit signals, which is a core accessory requirement for track circuit sections.
Q4: What key role does the installation accuracy of insulated pressing plates play in insulation performance?
A4: Excessive fitting gap between insulated pressing plates and rails/sleepers will cause the insulation gasket to shift and be damaged, losing insulation performance; insufficient installation torque will loosen the pressing plates and separate the insulation contact surfaces, which will also cause signal faults; accurate installation can ensure that the insulation gaskets are uniformly compressed and maintain stable insulation performance.
Q5: How to ensure the dual compliance of pressing plate accuracy and insulation performance in on-site installation?
A5: Use special tools to calibrate the levelness and verticality of pressing plates, and control the fitting gap and installation torque; match supporting insulation gaskets and insulated pressing plates in track circuit sections to ensure that the insulation layer is complete and undamaged; detect the track circuit insulation resistance after installation, and readjust the parts with unqualified accuracy and insulation to ensure the dual performance compliance.