Anti-reverse current system of DF8B diesel locomotive

Abstract

The utility model provides a kind of DF8B type diesel locomotive prevents reverse power system, the two connecting contacts corresponding to the forward position of direction conversion switch SA1 are located on forward position direction conversion circuit, the two connecting contacts corresponding to the backward position of direction conversion switch SA1 are located on backward position direction conversion circuit;The forward pull position of reversing handle KZ is used to connect forward position direction conversion circuit, the backward pull position of reversing handle KZ is used to connect backward position direction conversion circuit;Forward position direction conversion circuit is further provided with reversing contactor HFK1, and reversing contactor HFK1 is used to control locomotive forward;Backward position direction conversion circuit is further provided with reversing contactor HFK2, and reversing contactor HFK2 is used to control locomotive backward.This system can eliminate the possibility of reverse power operation under the premise of ensuring normal operation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the control technical field of diesel locomotive, concretely relates to a DF8B type diesel locomotive anti-reverse power system. BACKGROUND

[0002] The DF8B diesel locomotive electric transmission device is the traction motor on the locomotive wheel through a set of electric transmission device transmission to the traction motor of the locomotive wheel after the output power of the diesel engine through the traction generator, and the traction motor drives the locomotive wheel to run to drive the locomotive. The locomotive is equipped with six traction motors, and when the locomotive traction working condition, the three-phase alternating current generated by the synchronous main generator is supplied to the six parallel DC traction motors after three-phase bridge full-wave rectification of the main silicon rectifier cabinet, and the traction motor runs again by the transmission gear to drive the locomotive wheel, thereby making the locomotive run. When the locomotive advances or retreats, the current direction of the traction motor excitation winding is converted by the direction conversion switch, thereby changing the direction of the traction motor, controlling the locomotive to advance or retreat.

[0003] At present, the DF8B type diesel locomotive is gradually changed from the main type locomotive to the small operation, and due to the short traction operation section, the running direction is frequently changed, combined with the operation fatigue of the driver, which is easy to cause the inconsistency between the reversing handle position and the running direction, and if the main handle is lifted at this time, the traction motor will inevitably generate reverse power, and the serious one will cause the burning of the traction motor of the whole vehicle, which seriously affects the train safety. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses in order to solve the above at least one technical issue in the prior art, provides a DF8B type diesel locomotive anti-reverse power system.

[0005] The utility model discloses the following technical scheme is adopted: a DF8B type diesel locomotive anti-reverse power system, including forward position direction conversion circuit, backward position direction conversion circuit, direction conversion switch SA1 and reversing handle KZ;

[0006] The direction conversion switch SA1 includes two positions of forward position and backward position, wherein the two connection contacts corresponding to the forward position of the direction conversion switch SA1 are located on the forward position direction conversion circuit, and the two connection contacts corresponding to the backward position of the direction conversion switch SA1 are located on the backward position direction conversion circuit;

[0007] The reversing handle KZ of the driver controller has five positions: forward traction position, forward braking position, 0 position, backward traction position and backward braking position, wherein the forward traction position of the reversing handle KZ is used to turn on the forward position direction conversion circuit, and the backward traction position of the reversing handle KZ is used to turn on the backward position direction conversion circuit;

[0008] The forward direction conversion circuit is further provided with a reversing contactor HFK1, which is used for converting the current direction of the excitation winding of the traction motor, changing the rotating direction of the traction motor, and controlling the locomotive to move forward.

[0009] Preferably, on the forward direction conversion circuit, the normally closed contact of several traction motor contactors is connected in series and then connected in parallel with the normally open contact of the reversing contactor HFK1 to form a first self-locking circuit, and the coil of the reversing contactor HFK1 is connected in series with the first self-locking circuit.

[0010] Preferably, on the backward direction conversion circuit, the normally closed contact of several traction motor contactors is connected in series and then connected in parallel with the normally open contact of the reversing contactor HFK2 to form a second self-locking circuit, and the coil of the reversing contactor HFK2 is connected in series with the second self-locking circuit.

[0011] Preferably, the direction conversion switch SA1 and the reversing handle KZ are both arranged at the driver's cab console.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] In the system, only when the direction conversion switch is placed in the correct operating position and the driver places the reversing handle in the correct position, the circuit can be connected, the reversing contactor is powered on and acts, and the locomotive can run normally.

[0014] The driver can determine the position of the direction conversion switch according to the running direction to control the circuit connection and disconnection of the running direction of the DF8B type diesel locomotive, that is, the reversing operation can be conveniently performed, the possibility of reverse power operation is completely eliminated under the premise of ensuring normal operation, not changing the original vehicle design and simple personnel operation, the running safety of the locomotive is ensured, and a major accident caused by reverse power is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 Fig. 1 is a schematic diagram of the reversing handle of the driver controller in the embodiment;

[0017] Figure 2 Fig. 2 is a schematic diagram of the forward direction conversion circuit in the embodiment;

[0018] Figure 3 This is a schematic diagram of the carry-back direction conversion circuit in this embodiment;

[0019] Figure 4 This is a schematic diagram of the direction switching switch in this embodiment. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should fall within the scope of the technical content disclosed in this utility model. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0022] This utility model provides an embodiment:

[0023] like Figures 1 to 3 As shown, a reverse-electric system for a DF8B diesel locomotive includes a forward direction conversion circuit, a backward direction conversion circuit, a direction conversion switch SA1, and a reversing handle KZ. Both the direction conversion switch SA1 and the reversing handle KZ are located on the driver's cab control panel. The direction conversion switch SA1 has two positions: forward and backward. The two connecting contacts of the forward position of the direction conversion switch SA1 are located on the forward direction conversion circuit, and the two connecting contacts of the backward position of the direction conversion switch SA1 are located on the backward direction conversion circuit. The reversing handle KZ has five positions: forward pull, forward stop, 0 position, backward pull, and backward stop. The forward pull position of the reversing handle KZ is used to connect the forward direction conversion circuit, and the backward pull position of the reversing handle KZ is used to connect the backward direction conversion circuit.

[0024] The forward direction conversion circuit is also equipped with a reversing contactor HFK1. The normally closed contacts of several traction motor contactors are connected in series and then connected in parallel with the normally open contacts of the reversing contactor HFK1 to form a first self-locking circuit. The coil of the reversing contactor HFK1 is connected in series with the first self-locking circuit. The reversing contactor HFK1 is used to change the current direction of the traction motor excitation winding, change the direction of the traction motor, and control the locomotive to move forward. The backward direction conversion circuit is also equipped with a reversing contactor HFK2. The normally closed contacts of several traction motor contactors are connected in series and then connected in parallel with the normally open contacts of the reversing contactor HFK2 to form a second self-locking circuit. The coil of the reversing contactor HFK2 is connected in series with the second self-locking circuit. The reversing contactor HFK2 is used to change the current direction of the traction motor excitation winding, change the direction of the traction motor, and control the locomotive to move backward.

[0025] In this embodiment, according to the energizing sequence of electrical components and lines in the control circuit of the DF8B diesel locomotive, a direction switching switch SA1 is added after the reversing handle KZ position, connecting to lines 231 and 238 respectively. This ensures that the direction switching switch can only connect either line 231 or line 238 in one position. The direction switching switch SA1 is a standard two-position switch; when the switch is in the forward position, only line 231 is connected; when the switch is in the backward position, only line 238 is connected. This avoids backflow caused by the driver accidentally moving the reversing handle after the direction of travel has been established. Positioning the direction switching switch on the driver's control panel facilitates the driver's switching when needed.

[0026] When the locomotive direction is determined to be forward, and the direction change switch SA1 is in the forward position, and the reversing handle KZ is in the forward traction position, the coil of the reversing contactor HKF1 can be connected through the X2:8 cable tray, line 231, and the normally closed contacts of traction motor contactors 1C-6C (which are closed during reversing, and their coils can only be energized after the corresponding traction motor starts; traction motor contactors 1C-6C correspond to 6 traction motors respectively). The normally open contact of the reversing contactor HKF1 closes to achieve circuit self-locking, and the forward position is energized. When the locomotive direction is determined to be backward, and the direction change switch SA1 is in the forward position, and the reversing handle KZ is in the backward traction position, the coil of the reversing contactor HKF2 can be connected through the X2:9 cable tray, line 238, and the normally closed contacts of traction motor contactors 1C-6C. The normally open contact of the reversing contactor HKF2 closes to achieve circuit self-locking, and the backward position is energized.

[0027] Furthermore, if the locomotive is actually running in the forward position and the newly installed direction change switch is also in the correct forward position, but the driver mistakenly places the reversing handle KZ in the rear traction position, the rear forward position circuit cannot be connected because circuit 238 is disconnected at this time, thus ensuring that the locomotive traction motor will not be energized and preventing reverse current problems. When the locomotive is actually running in the rear forward position and the newly installed direction change switch is also in the correct rear forward position, but the driver mistakenly places the reversing handle KZ in the forward traction position, the forward position circuit cannot be connected because circuit 231 is disconnected at this time, thus ensuring that the locomotive traction motor will not be energized and preventing reverse current problems.

[0028] In summary, the circuit can only be connected, the reversing contactor can be energized and the vehicle can only move normally when the direction change switch is set to the correct operating position and the driver sets the reversing handle to the correct position.

[0029] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A reverse current prevention system for a DF8B diesel locomotive, characterized in that: Includes forward direction conversion circuit, backward direction conversion circuit, direction conversion switch SA1 and reversing handle KZ; The direction switching switch SA1 has two positions: forward and backward. The two connecting contacts of the forward position of the direction switching switch SA1 are located on the forward direction switching circuit, and the two connecting contacts of the backward position of the direction switching switch SA1 are located on the backward direction switching circuit. The driver controller's reversing handle KZ has 5 positions: forward pull position, forward stop position, 0 position, backward pull position, and backward stop position. The forward pull position of the reversing handle KZ is used to activate the forward direction conversion circuit, and the backward pull position of the reversing handle KZ is used to activate the backward direction conversion circuit. The forward direction conversion circuit is also equipped with a reversing contactor HFK1, which is used to switch the current direction of the traction motor excitation winding, change the direction of the traction motor, and control the locomotive to move forward; the backward direction conversion circuit is also equipped with a reversing contactor HFK2, which is used to switch the current direction of the traction motor excitation winding, change the direction of the traction motor, and control the locomotive to move backward.

2. The anti-reverse current system for a DF8B diesel locomotive according to claim 1, characterized in that: In the forward direction conversion circuit, the normally closed contacts of several traction motor contactors are connected in series and then connected in parallel with the normally open contacts of the commutation contactor HFK1 to form a first self-locking circuit. The coil of the commutation contactor HFK1 is connected in series with the first self-locking circuit.

3. The anti-reverse current system for a DF8B diesel locomotive according to claim 2, characterized in that: In the rear direction conversion circuit, the normally closed contacts of several traction motor contactors are connected in series and then connected in parallel with the normally open contacts of the commutation contactor HFK2 to form a second self-locking circuit. The coil of the commutation contactor HFK2 is connected in series with the second self-locking circuit.

4. The anti-reverse current system for a DF8B diesel locomotive according to claim 1, characterized in that: Both the direction switching switch SA1 and the reversing handle KZ are located on the driver's cab control panel.

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