Except for the very few models of diesel locomotives, there is no type 5 air compressor. Type 5 air compressors are commonly used on many types of diesel locomotives. It has been tested for a long time and has been tested and matured. In the previous period, the 1åž contact on the control circuit was burned more seriously, which often affected the normal operation. In the same way, the air compressor motor adopts the shunting mode, and the starting is frequent, which causes the burning damage to be extremely serious. The improved air compressor is cancelled. Only after the wind pump motor is changed to the series excitation type 7, the whole control circuit motor works. Normal, the failure rate is greatly reduced, which improves the efficiency of the locomotive. The new question can appear in the lubricating oil system of the air compressor. Due to the pressure of grease and oil, the 1 5 5 type air compressor burns and damages the parts, which makes the air compressor often malfunction and directly affects the locomotive. The existence of the actual application of efficiency, forcing us to take effective measures as soon as possible, use the most scientific methods to solve this practical difficulty early, and strive to improve the efficiency of locomotive operation.
2 Reasons for analysis of air compressor linkages, strains, burnt cylinders, crankshaft strain, piston damage, etc., after repeated observations and disassembly after failure analysis, resulting in air pump damage 2.1 maintenance and repair of oil quality causes in daily use and maintenance process In the middle, because the maintenance personnel are not paying attention to the lubrication of the air pump, the dirty grease is added to the air pump, so that the oil path is not smooth or even blocked, resulting in lower oil pressure, poor lubrication of the parts or lubrication. Burning the Valle shaft damselfly burned.
Because the lubricating oil is too dirty, the filter is too much dirt to be in the inspection period, the oil flow is not smooth or blocked, so that the oil pressure is reduced or there is no oil pressure, resulting in poor lubrication of the components, causing burnt tiles and cylinder shaft strain.
Overhaul the parts of the air compressor, do not talk about civilized repair, so that the dirt directly attached to the parts only the lubricating oil pressure is too low to wash the dirt on the friction. Causes friction to pay for local lubrication.
Due to the simplified operation during maintenance or excessive pursuit of cost reduction, the oil is not available, the filter is not cleaned in time, and the filter is not replaced in time, causing the lubricant to be dirty, affecting the oil pressure, causing lubrication of the lubricating parts. Xiaoliang, the heat between the parts is not cooled, causing the air compressor to burn.
During the overhaul process, the clearance between the connecting rods and the crankshaft connecting rod neck is too large, which causes the oil jade to decrease rapidly, so that the oil pressure of the rear lubricating parts is too low, and the lubricating and cooling is poor, and the burning parts are pulled.
2.2 The quality of lubricating grease of inferior grease type D air compressor is also very critical. The requirements are high and must meet the technical requirements. In daily use, the relevant departments often ignore this important factor, especially the long-term use of air compressor rouge, which often undergoes qualitative dilution or emulsification, and some air compressor oils that do not meet the technical requirements are normally used, resulting in air pressure. When the oil pump is working normally, it is difficult to establish the oil pressure required for lubrication between the components, resulting in strain and burning of the components.
2.3 The filter is blocked and the oil is not sucked up. In daily use, due to improper maintenance, etc., adding people to dirty grease, or not changing the grease for a long time, the grease is dirty, and the dirt blocks the filter. The wax can't be sucked up, and the oil pressure can't be violated. Causes a lack of burns and burns the wind pump.
2.4 oil pump failure and tubing joint loose leak, 4 diesel locomotive operating frequency is high, in the long-term operation is inevitable air compressor 汕 pump failure. In addition, the oil pipe crack joints loosely destroy the oil circuit, so that the oil circuit is mixed into the air, which is easy to cause the component oil pressure to be too low or the oil pressure cannot be established, and the operation of the air compressor is only controlled by the total wind pressure, and is not affected by the oil. Pressure control. When the oil pressure is too low or there is no oil pressure, the parts will not work in time to be lubricated and cooled, and the rooting of the parts is unavoidable.
Empty 1; during the long-term working process of the machine, the wear of the crankshaft and the connecting rod or the quality of the tile body causes the gap to be too large, and the oil leakage is serious, resulting in the oil pressure not being established or too low, causing the air compressor parts to burn. Damage or strain.
3 Automatic control protection device setting 04 The air compressor components of the locomotive are damaged and burned, mostly due to poor oil lubrication. Therefore, it is necessary to control the working state of the air compressor from the oil pressure protection, so as to ensure that the air compressor does not cause the component to be strained or burned due to poor lubrication, and the accident is enlarged, and unnecessary damage is reduced, so that the relevant device must be installed. Realize the automatic protection of the air compressor.
3.1 Oil pressure relay reverse, 12.1 setting Oil pressure relay 2 blades are respectively set at the end of the two air compressor lubricating oil lines to monitor the safe working oil pressure at the end. According to the application practice and experimental results, the end safe working oil pressure reaches 60; it can ensure the normal operation of the air compressor. If it is lower than this pressure value, the crankshaft bearing connecting rod cylinder of the air compressor is easy to be pulled or burned. Therefore, the pressure value of the hydraulic relay is adjusted to be between 6080 kPa. Connect the contact of the hydraulic relay Jiang Xing 27 in series between the manual control of the air compressor and the ruler and the coil when the end oil pressure reaches 60! When the contact is closed, the glutinous rice is floating 5 ft. At 60 kPa, the FYJ contact is disconnected, the YC working power is cut off, and the air compressor motor has no working power air compressor to stop working, and the protection is protected. The safety of the air compressor.
3.2 Delay cut-off relay, 81 set delay to cut off the relay, 31 setting, mainly used for the auxiliary function of the air compressor instantaneous start, because the oil mill does not work when the air compressor starts, the oil pressure has not been established, use Or manually make it electrically conductive, which is convenient for the air compressor to start. Delay the relay, æ±¾ and parallel in the air compressor control circuit. The forward conduction delay is 58. After the actual test, the air compressor works normally 3, 8, which will not affect the damage of the air compressor components. After 10 seconds of operation, the end oil pressure exceeds 60 8014, which makes the 2 magical contact conduction. The air compressor contactor 0 is operated by the electric air compressor, and the air compressor works normally.
When the air compressor is running 3 and the end oil pressure has not yet been established 60803, the 未2 non-operating contact is in the off state, the relay is cut off after a delay, 8 is delayed after 8 delays, and the air compressor contactor 0 is de-energized. The air compressor stops, and the air pressure protection of the air compressor is used. When the air compressor is working normally, as long as the end oil pressure is lower than 608, the 12 factory 1 acts, the contacts are disconnected, the power is lost, and the air compressor stops. Air compressor low oil pressure protection.
4 Principle of operation The various working conditions of the original type 5 air compressor are only controlled by the change of the total wind pressure. When the total wind pressure rises to about 9003, the 1 action finger is disconnected, the 0 is de-energized, and the air compressor motor stops running, so that the air compressor stops the air pressure. This air compressor control system only relies on the total wind pressure signal, regardless of the condition of the air compressor itself, causing the air compressor parts to be severely damaged and unable to be used. In severe cases, the machine is broken or the degree of driving is different. , reducing the efficiency of the use of benzyl, affecting safe transportation production, resulting in greater economic losses.
4.1 Automatic control protection After adopting the new control protection system, in addition to still taking the total wind pressure change as a signal, it is also necessary to take the working oil pressure of the air compressor as a signal, and add an instantaneous start delay to ensure The air compressor itself operates safely under the condition that it meets the technical requirements, and prevents the occurrence of adverse effects such as the damage of the parts. The circuit number of the circuit bracket is the original locomotive line number.
Air compressor automatic control protection circuit When the total wind pressure is about 750kPa, YK first action, its finger closes and starts to extend, the relay 03 is turned off, and the instantaneous starting circuit of the air compressor is +15847YK63DSJ49449yC, 0 momentary start The electric motor is energized and the air compressor is driven to drive the air. When the electric conduction is turned on 58, the oil pressure at the end of the air compressor is established, and when the temperature reaches 6080 kPa or more, lFYJ and 21 act, the contacts are turned on, and the air compressor pump delay device is formed, 31 cuts the electric passage, due to the air The oil pressure at the end of the oil passage of the press reaches more than 6083, so the conduction with the 2 and 7 contacts ensures that the air compressor works safely and normally.
No matter which air compressor end oil pressure is lower than 3 80 to 3 or less, 1 is 7 or 2 is 7 must have a contact disconnected, so that power is lost, the air compressor motor stops, the air compressor stops 1 Work to prevent parts from being strained or burnt. At this time, although the total wind pressure is lower than seven, 1 contact is in the on state, the starter is started, 3. is still in the power-on state, and has already exceeded 510, so the air compressor is cut off instantaneously. Start the action circuit, so that the air compressor will not work on the pump to ensure the absolute safety of the air compressor.
Conduction, 3 conduction 5105, so that the air compressor pump work 53, the end oil pressure does not reach 60 8 and 2 will not move, so the instant start delay cut off the relay 03. and the oil pressure switch and 21 can not Turn on, so cut off the working power, so that the air compressor stops working, to ensure that the air compressor will not be damaged. 4.2 Manual control protection When manual control is used, the function circuit is 60 or more. 1 and 2 are 7 actions, the contacts are closed, and the working circuit is +12449678484iFYJ82FYj49449, and the air compressor can work normally.
If the air pressure of the air compressor does not reach 603 after the air compressor is working 3, and the 2 strokes do not work, the contact is disconnected, the delay device is also disconnected, and the working power supply is cut off at this time, so that the air compressor motor is stopped. Turn and protect the air compressor.
If the oil pressure of a certain air compressor is lower than the dangerous value and it is confirmed that it is the cause of the air compressor itself, and there is an air compressor working well, in order to maintain the operation, the faulty air compressor oil pressure switch contact can be short. Connect and remove the fuses to make the air compressor working well.
5 Conclusion This automatic control and protection device used by the locomotive air compressor has high automation degree and strong practicality. It can completely prevent the locomotive air compressor from being burned in the operation, reduce unnecessary traffic accidents and reduce maintenance. Cost, greatly improve the efficiency of locomotive operation, ensure the safe use of locomotives, reduce transportation costs = responsible editor Ma Yulin received date 2005.8
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