In order to further determine the fault location, we installed a wind pressure gauge at the pressure switch to observe the wind pressure change of the spring parking device. It is found that the total wind pressure is normal. When the locomotive crew lifts the handle or the handle is operated, the wind pressure of the spring parking device sometimes drops suddenly, and the air is slow or even not charged. From this we conclude that the fault location is a redirecting valve.
Analysis of the cause It is known from the principle of the action of the spring parking device that the air pressure of the brake cylinder of the spring parking brake determines the working state of the spring parking brake. When the air pressure is greater than 450 kPa, the spring parking brake is in a mitigation state; when the air pressure is less than 450 kPa, the spring parking brake is automatically in a braking state.
When the total wind pressure of the locomotive is normal, if the spring parking brake control air passage is blocked, the spring parking device will cause the above failure. The spring parking device controls the direction changing valve in the air path, which is a key component of the locomotive total wind direction spring parking brake air charging. When the variable position valve plunger causes the variable direction valve plunger to be in the middle position of the changing valve due to stuck or hurricane The plunger interrupts the deflecting air outlet, causing the total wind to change the air volume of the spring parking brake to the spring parking brake, or even the air, the spring parking brake air charge is less than the leakage amount, and the spring parking brake brake cylinder air pressure is less than The locomotive is unloaded at 450 kPa and the spring parking brake is braked.
After the locomotive is returned to the section, the outlet valve of the variable direction valve is loosened, and the inspection proves that our analysis is correct. Improvement measures and effects According to the above analysis, it can be seen that the plugging phenomenon of the reversing valve plunger is eliminated, the air passage of the spring parking device is kept unobstructed, and the wind pressure of the brake cylinder of the spring parking brake is always greater than 450 kPa, and the spring parking device does not suddenly occur during the running of the locomotive. Brake failure. Due to structural problems with the directional valve, we have improved the directional valve plunger. Improve the front and rear plunger dimensions as shown.
After the improved plunger size is improved, the plunger size change valve is improved, the plunger can not block the air outlet, the air flow of the direction changing valve is always kept clear, the hidden trouble of the spring parking device is eliminated, and the spring is improved. The reliability of the parking device. The improved reversing valve is used for loading, and there is no sudden spring braking device sudden braking and locomotive unloading failure. It is proved that this improvement measure is feasible.
Mattress Non Woven Felt,Mattress for Flat Bed,Mattresses for the Elderly
Fenghua Jade Motor Co., Ltd. , http://www.ywwjsl.com