1、韶山（Shaoshan）Remarks1., the information, rules, questions in the answer annotated sources, such as:J27 says the question comes from (twenty-seventh);C66 says the question comes from (sixty-sixth rules);Y18 says the question comes out of eighteenth;S-P36 says the title is from the thirty-sixth page of
2、 the book of eventsThe 2. general knowledge questions indicating the source in the answer, such as to fill in the blanks answer the first question of “outside calipers“, in the “outside calipers“ three characters after the marked “P5“ said the problem “(from the locomotive crew general knowledge“ pa
3、ge fifth and so on.(five) comprehensive questions1. the composition and characteristics of bogies for SS4 modified electric locomotives are described.Answer: 1. SS4 modified electric locomotive bogie frame, axle, wheel, the axle box suspension device, supporting device (1), the gear, the motor suspe
4、nsion device (1) and basic components such as brakes traction. (1) the frame characteristics of SS4 modified electric locomotive steering: SS4 modified electric locomotive by four sets of two axle bogie components, shaft column type 2 (BO-BO), (1) each bogie are mutually independent, live Festival n
5、ot connected; (1) each axis by a traction motor independent drive; (1) traction motor suspension with semi axle suspension; (1) the body supporting device adopts rubber spring, friction damper and two lateral damper; (1) the traction point is low, only 150mm, can reduce the load transfer, improve th
6、e utilization of adhesion (1 points: fixed) short wheelbase, to the curve and so on. (1 points) P52. how to use axle column type to indicate the characteristics of locomotive running parts? Write the column type of the SS4 modified electric locomotive and make a brief explanation.2. answer: the axle
7、 column type is a simple way to express the characteristics of locomotive running parts by numbers or letters. (2 points) digital representation: the number indicates the number of axes of the bogie, and the footnote “O“ indicates that each of the moving shafts is driven separately, without footnote
8、s indicating that the shaft is driven in groups. (2 points) letter representation: in English letters indicate the number of axes, A is 1, B is 2, C is 3, And so on. (1 points) the “one“ between numbers or letters is often omitted, but some locomotive bogies are joined by live knots, so that the num
9、ber of connections between numbers or letters should be written as “+“ numbers, which cannot be omitted. (2 points) the axle type of the SS4 modified electric locomotive is 2 (B0-B0), (1 points) indicating that the locomotive consists of two identical four axle locomotives. Each car consists of two
10、two axle bogies, each of which is driven separately. (2 points) P103. what is the range of contact? Why should there be a range?3. A: when the dynamic contact and static contact in the contact process, the contact and the static contacts to the moving contact static, dynamic contact distance in the
11、grinding static contact surface is called contact distance Research (3 points). The grinding distance is generated by the grinding spring of the moving contact. It is a grinding process with both sliding and rolling (2 points). The grinding distance can not only remove the oxide and dirt on the cont
12、act surface, but also contact the contact line and separate the contact line (2 points). When the contact is broken, the arc only occurs at the beginning of the contact line, thus protecting the normal working contact well (3 points). P214. what is the reversibility of the direct current motor? What
13、 are the applications on the locomotive?4. answer: whether direct current motor or AC motor are reversible (2 points). The reversibility is that the same motor can be used as a generator and as an electric motor (2 points). The reason is that the motor itself is mechanical energy and electrical ener
14、gy conversion devices, the energy conversion process is in accordance with the law of electromagnetic induction as the basis, only in the objective conditions, showing different operating conditions (2 points). The traction motors used in electric locomotives use the reversibility of the DC motor an
15、d operate as a motor when the locomotive is pulled (2 points): when the locomotive is braking, it acts as a generator (2 points). P265. traction motors have ring fire what are the reasons?Answer: 5. reasons of ring fire are: (1) in the brush holder, insulator, commutator, mica slot, etc. due to the
16、aggregation of the film increased carbon powder, dust, oil, water and other dirt conductive and insulation resistance decreased caused by ring fire (2 points): (2) for some reason the damage caused by the armature winding insulation, interturn short circuit breakdown and fire ring (2); (3) winding c
17、onnection or brush line due to bad fixation looseness caused by worn insulation, causing a short circuit caused the fire ring (1); (4) brush off brush, brush or braid defect caused by poor contact ring fire (1 points): (5) due to lack of brush spring pressure, brush gear loose or commutator eccentri
18、city, deformation, a convex piece caused by brush commutator caused by beating in the ring of fire (2 points): (6) high speed and overload caused by ring fire (1 points);(7) the characteristic of the surface of the commutator is too steep and the local voltage between the chips is too high to cause
19、the ring fire (1 points). P436. briefly describe the path of the control circuit of the intermediate relay 556KA in the condition of resistance braking.Answer: 6. in the resistance braking condition, 405 to 209KM 210KM, the normally open contact of the normally open contact and the normally open con
20、tact 91KM (2) - 429 - 530KT - 4QF interlock normally open normally open contact to 556KA and 400 (1) 209KM, 210KM brake fan contactor, when a brake fan fault using the brake fan, isolating switch short circuit. (3) 91KM is controlled by a line contactor, and zero delay line contactor and relay contr
21、ol of the 532KT (2 points), so when the brakes to make 556KA action, speed regulating handwheel driver controller must leave the “0“. (2 points) P677. what is stepless speed regulation? What are the pros and cons?Answer: 7. type electric locomotive rectifier, rectifier circuit with high power silico
22、n diode as the rectifying element, if the silicon diode for thyristor controlled thyristor trigger to adjust the voltage (2 points), making the locomotive do stepless speed stepless speed regulation mode is called (1 points). Stepless speed regulation can make full use of the adhesion weight of loco
23、motive, exert greater traction force, and reduce the impact of locomotive current and traction force (2 points). At the same time, the switch with heavy structure is omitted. (1 points) the disadvantage of stepless speed regulation is that the fluctuation of the rectifier voltage increases, which le
24、ads to the increase of the current ripple, the disadvantage of the traction motor, and the interference to the communication circuit along the line (2 points). Due to the rectifier voltage waveform changes, harmonic components increase, locomotive power factor is low, therefore, a multi segment brid
25、ge half controlled bridge rectifier circuit phase control utility, SS4 modified locomotive is the three unequal half controlled voltage rectifier circuit. (2 points) P758., the air brake valve in the shift, the electrical air brake controller in the movement of the transposition and overcharge posit
26、ion of the difference?8. answer: translocation and over charging, are to make the 803 wire power, (1 points) have balanced air cylinder and brake pipe charging, vehicle mitigation. (1 points) when the shift, due to the 809 lines of power, exhaust 1 air valve, 254YV power, open air outlet, so that th
27、e locomotive can be eased. (3 points) when charging, the 809 lines lose power, the exhaust air is 1, the air valve is 254YV, the power is switched off and the air outlet is switched off, and the locomotive can keep the pressure after braking. (3 points) at the same time, 805 wire power, so that the
28、charging empty valve 252YV power, to maintain the braking force of the locomotive, the brake pipe pressure is higher than the constant pressure 30-40kPa. (2 points) P1079. test the reasons of the air brake controller in the shift, balance the pressure of the air cylinder, no pressure of the brake pi
29、pe and the treatment methodAnswer: 9. reasons: (1) neutral electro pneumatic valve 253YV valve is not tightly closed: (2) (2) position relay valve shut-off valve, not reset. (2 points): (1) the electro pneumatic brake controller lever to neutral position 23 times (1 points) to see whether they can r
30、eturn to normal, if not to close the 157 cock, turn the air control, then check the replacement of neutral electro pneumatic valve: (2) (2) to air control. There is no brake pipe pressure, removable shutoff valve, a repair is not good, can draw the shut-off valve, to maintain the operation to repair
31、. (3 points) P11010., the air brake valve in the air position control, why did not move the role of transposition?10. answer: air brake valve in the air position control, because the transfer piston drive micro switch, SA (1) disconnect the electric air brake controller power supply, thus lost the p
32、ositioning plunger in the role of transposition. (2) SA (2) through the micro switch control exhaust l electric air valve 254YV electric effect, namely in the same role of plunger translocation and neutral position position, thus cutting off the gas channel balanced air cylinder, (2 points) and cut
33、off the exhaust passage balanced air cylinder. A neutral state. (2 points) so the role of transposition and neutrality of the same, to ease the train, you can air brake valve handle to ease the position; (2 points) to ease the locomotive brake alone, you can press down the handle can be achieved. (2
34、 points) P10611. air position control, the air brake valve to relieve bit, the balance of the air cylinder is not full of wind, what is the reason? How to deal with it?11. answer: reasons: (1) the air brake valve on the air to air conversion key is not in place: (1 points) (2) isolation two tubes, 2
35、64V breakdown: (1 points) (3) brake air valve 257YV fault. (1 points): (1) the electro pneumatic reciprocating conversion key several times to confirm the location of normal can control: (2) (2) check the reconnection electric air valve 259YV, such as electricity can disconnect the 821 line -800 lin
36、e maintenance operation: (2) 153 (3) did not go to the changeover cock the air, the 153 cock pull to the air, eliminate the influence of 257YV on the wind road. (3 points) P11212., the adsorption drying process of compressed air is discussed12. A: when the air compressor pump wind, wet air saturated
37、 by air compressor through the cooling pipe into the filter cylinder,(1 points) through the stainless steel wire mesh filter, the compressed air oil mist, moisture and dust intercepted capture. (2 points) and then remove the wet air condensation water and oil mist into the drying cylinder (2) throug
38、h the activated alumina adsorbent, the adsorption of water vapor molecules was down, (2) dry compressed air through a valve into the air cylinder, the other (1 points) through the orifice is filled into the regeneration air cylinder. (2 points) P9113. what should be paid attention to in the inspecti
39、on and maintenance of electric locomotive electrical equipment?13. answer: because most of the electric locomotive, electric motor works in high voltage and large current, the check should pay attention to the following aspects: (1) the contact system of electric components, key to check the distanc
40、e, pressure, contact and contact state (1 points): (2) on the transmission system of electric appliances we should check whether it is reliable and accurate (1 points); (3) the electrical coupling system should focus on checking whether there is broken and thermal discoloration phenomenon. (2 points
41、): (4) the connection state of auxiliary motor system should check the main splitter, voltage starting relay and control the reliability of electrical appliances. Ensure the reliability of three-phase power supply auxiliary circuit, prevent split camera loss (2 points); (5) the traction motor should
42、 focus on examination of the brushes and commutator state (2 points): (6) for the insulation part of motor, electrical appliances should check whether Aging, burning, discoloration, crack damage, and check their cleanliness (2 points). P12314. briefly describe the control circuit of the over-current
43、 protection of the original side.14. answer: when the original side overcurrent relay (101KC) detects the over-current of the original side, the 101KC pull in, and its normally open interlock, so that the original side of the over-current intermediate relay 565KA to be absorbed by the merger, self-l
44、ocking, and its normally open interlock to break the main circuit breaker. (4 points) its control circuit is: electronic cabinet 1780 - 101KC, often open interlock 565KA - 400. (2 points) electronic cabinet 1780 - 562KA normally closed interlock 565KA open interlock 565KA 400 (self-locking circuit).
45、 (2 points) 531 to 565KA, normally open interlock, 544 to 4QF, normally open interlock 4QFF (main circuit breaker, split coil) 4KF open interlock. (2 points) P7015. whats the requirement for the locomotive attendant who is in the middle of the project?15. answer: to participate in the repair of the
46、locomotive crew or the repair section of the representatives should start before the beginning of the report to the acceptance room, (2To be a good assistant to the inspector and under the leadership of the director of maintenance, to complete the work within the prescribed scope of the railway bure
47、au. (2 points) after delivery of the vehicle, repair section and resident room acceptance of a written appraisal of the locomotive maintenance status and crew repair during the performance, (2) together with the attendance table together send their locomotive depot. (1 points) in the self repair loc
48、omotive car, should leave the repair section in 48h, (1) repair section should fill out complete locomotive logbook and acceptance record to return the car back to the staff after receipt. (2 points) P14216. briefly describe the control circuit of overcurrent protection on the secondary side.Answer:
49、 16. secondary side overcurrent detection signal directly into the electronic cabinet, electronic cabinet secondary flow is sent to determine voltage signal +110V (2 points), direct effects on 565KA, 565KA have electric action and self-locking, finally the main circuit breaker fault. (2 points) its control circuit is: electronic cabinet 552 lines 565KA 400. (2 points) electronic cabinet 1780 - 562KA normally closed interlock 565KA open interlock 565KA 400 circuit self-locking. (2 points) 531, 565KA, normally open interlock 544 to 4QF, normally open interlock 4QFF (main circuit breaker, split
