Vehicle-mounted arcing detector for pantograph catenary

Abstract

The utility model relates to a vehicle-mounted arcing detector for a pantograph catenary. Comprising a connecting piece fixedly mounted on a bow rack, a sampling rod arranged on the connecting piece, a balance body arranged on the connecting piece, a sliding body arranged on the sampling rod and connected with the sampling rod in a sliding manner, and a bidirectional driver configured to drive the sliding body to slide on the sampling rod in a reciprocating manner, the first end of the sampling optical fiber is arranged on the sliding body, the signal detection module is connected with the second end of the sampling optical fiber, and the balance body and the sampling rod are located on the two sides of the connecting piece respectively. According to the vehicle-mounted arcing detector for the pantograph catenary, arcing of the pantograph catenary is collected through the dynamic optical fiber, then the intensity of the arcing is reversely analyzed through the intensity of the ultraviolet light in the light generated by the arcing, in this way, collection can be conducted by approaching the arcing position, and more accurate detection data can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of pantograph-catenary detection, and in particular to a vehicle-mounted arcing detector for a pantograph-catenary. Background Art

[0002] Pantograph-catenary arcing refers to the phenomenon that occurs during the dynamic contact process between the pantograph and the contact network. The core reason is poor contact and mechanical instantaneous detachment. At the same time, due to the influence of factors such as rapid sliding of the pantograph and strong air flow field, the pantograph-catenary arcing changes dramatically, seriously affecting the current collection quality of the EMU.

[0003] There are currently two methods for studying arcing in bow-catenary systems: image analysis method and characteristic spectrum method. The image analysis method uses a highly sensitive image sensor to capture arcing images. This method has high operating costs and the deployment location of the image sensor is severely limited. It is also necessary to consider the impact of high voltage on the normal operation and service life of the image sensor. It is currently still in the experimental stage.

[0004] The characteristic spectrum method is to use the collected light samples for analysis. Light collection requires the use of light sensors. The light sensors work between the train and the pantograph. The internal circuit boards and electronic components are easily affected. At this time, it is necessary to increase the distance between the light sensor and the pantograph, but this will result in insufficient light being collected. Summary of the invention

[0005] The present application provides a vehicle-mounted arc detector for a bow-net, which collects bow-net arcing through a dynamic optical fiber, and then reversely analyzes the arc intensity through the intensity of ultraviolet rays in the light generated by the arc. This method can collect data close to the arc, and can obtain more accurate detection data.

[0006] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0007] The present application provides a vehicle-mounted arc detector for a pantograph-catenary system, comprising:

[0008] A connecting piece, used for fixed installation on the bow frame;

[0009] A sampling rod, arranged on the connecting piece;

[0010] A balancing body is arranged on the connecting piece, and the balancing body and the sampling rod are respectively located on two sides of the connecting piece;

[0011] A sliding body, which is disposed on the sampling rod and is slidably connected to the sampling rod;

[0012] A bidirectional driver configured to drive the sliding body to slide reciprocally on the sampling rod;

[0013] A sampling optical fiber, a first end of which is disposed on the sliding body;

[0014] The signal detection module is connected to the second end of the sampling optical fiber.

[0015] In a possible implementation of the present application, a collecting port is provided on the sliding body, and the first end of the sampling optical fiber is located at the bottom of the collecting port.

[0016] In a possible implementation of the present application, the cross-sectional area of ​​the collecting port tends to decrease in a direction close to the first end of the sampling optical fiber.

[0017] In a possible implementation of the present application, the bidirectional driver includes:

[0018] A symmetrically arranged drive motor;

[0019] A guide wheel, arranged on the rotating shaft of the driving motor; and

[0020] A driving rope is wound around the guide wheel;

[0021] Wherein, two driving ropes are both connected to the sliding body.

[0022] In a possible implementation of the present application, an insulating base is also included, and the drive motors are all deployed on the insulating base.

[0023] In a possible implementation of the present application, the signal detection module includes:

[0024] shell;

[0025] The UV-sensing crystal and the photomultiplier tube are both located inside the housing;

[0026] A detection circuit electrically connected to the photomultiplier tube;

[0027] The second end of the sampling optical fiber is abutted against the ultraviolet sensing crystal.

[0028] In a possible implementation of the present application, the ultraviolet sensing crystal is abutted against the photomultiplier tube.

[0029] In a possible implementation of the present application, the ultraviolet sensitive crystal includes a GaN-based crystal and a ZnS-based crystal.

[0030] The beneficial effects of this application are:

[0031] The vehicle-mounted arc detector for the bow net disclosed in the present application collects light by moving the optical fiber close to the arc, and the collected light is input to the ultraviolet sensing crystal and the photomultiplier tube for processing, and the processing process converts the ultraviolet light into an electrical signal with varying intensity. Through the waveform of the electrical signal, it is possible to intuitively obtain whether the arc occurs and the intensity change of the arc process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a vehicle-mounted arc detector provided in the present application.

[0033] Figure 2 It is a schematic diagram of the connectivity of a connector, a sampling rod and a balancing body provided in the present application.

[0034] Figure 3 It is a schematic diagram of the shape of a collection port provided in this application.

[0035] Figure 4 It is a structural schematic diagram of a bidirectional driver provided in this application.

[0036] Figure 5 It is a structural schematic diagram of a signal detection module provided in this application.

[0037] In the figure, 1. connector, 2. sampling rod, 3. balancing body, 4. sliding body, 5. bidirectional driver, 6. sampling optical fiber, 7. signal detection module, 41. collecting port, 51. driving motor, 52. guide wheel, 53. driving rope, 54. insulating base, 71. outer shell, 72. ultraviolet sensing crystal, 73. photomultiplier tube, 74. detection circuit. DETAILED DESCRIPTION

[0038] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0039] This application discloses a vehicle-mounted arc detector for a pantograph, see Figure 1 and Figure 2 In some examples, the on-board arc detector for the pantograph disclosed in the present application includes a connector 1, a sampling rod 2, a balancing body 3, a sliding body 4, a bidirectional driver 5, a sampling optical fiber 6 and a signal detection module 7. The connector 1 is fixedly mounted on the pantograph, and the pantograph here refers to a structural member for mounting a carbon slide plate on the train pantograph.

[0040] In some possible implementations, the connecting member 1 is fixed to the bow frame by bolt connection.

[0041] The balancing body 3 and the sampling rod 2 are respectively located on both sides of the connecting member 1 and are fixedly connected to the connecting member 1. The reason for using the balancing body 3 here is to prevent the upper surface of the bow frame from tilting during the lifting process, because simply using the sampling rod 2 will cause the center of gravity of the connecting member 1 to shift.

[0042] The sliding body 4 is located on the sampling rod 2 and is slidably connected to the sampling rod 2. The bidirectional driver 5 is generally deployed on the top of the train, and its function is to drive the sliding body 4 to slide back and forth on the sampling rod 2. The purpose of the reciprocating sliding is to dynamically follow the contact position between the carbon slide plate and the pantograph.

[0043] The first end of the sampling optical fiber 6 is arranged on the sliding body 4, and the second end is connected to the signal detection module 7. The specific working principle is:

[0044] The sampling optical fiber 6 collects the light at the arcing point, and then guides the light into the signal detection module 7. The signal detection module 7 converts the ultraviolet rays in the light into electrical signals, and the intensity of the electrical signals fluctuates with the intensity of the ultraviolet rays.

[0045] For some examples, see Figure 3 A collecting port 41 is provided on the sliding body 4, and the first end of the sampling optical fiber 6 is located at the bottom of the collecting port 41. The collecting port 41 is used to expand the collecting surface so that the sampling optical fiber 6 can collect sufficient light generated at the arcing location.

[0046] In some possible implementations, a fiber optic plug may be installed on the first end of the sampling optical fiber 6 , and then the fiber optic plug may be fixed on the bottom surface of the collecting port 41 , with the connecting end of the fiber optic plug extending from the sliding body 4 .

[0047] In some possible implementations, the cross-sectional area of ​​the collecting port 41 tends to decrease in a direction close to the first end of the sampling optical fiber 6 .

[0048] For some examples, see Figure 4 The bidirectional drive 5 includes a driving motor 51, a guide wheel 52 (dashed circle in the figure) and a driving rope 53. There are two driving motors 51, which are generally symmetrically arranged on the top of the train. A guide wheel 52 is installed on the rotating shaft of each driving motor 51, and the driving rope 53 is wound around the guide wheel 52.

[0049] The two driving ropes 53 are also connected to the sliding body 4 to drive the sliding body 4 to slide back and forth on the sampling rod 2. The driving ropes 53 are used here because the driving ropes 53 can increase the distance between the sliding body 4 and the driving motor 51.

[0050] Furthermore, an insulating base 54 is added, and the drive motor 51 is deployed on the insulating base 54, in order to reduce the influence of electromagnetic interference in the surrounding environment on the working accuracy of the drive motor 51. It should be understood that in order to ensure that the sliding body 4 dynamically follows the contact position between the carbon slide plate and the bow net, the drive motor 51 needs to use a servo motor.

[0051] When the electromagnetic interference in the environment around the servo motor is strong, it will affect the normal operation of the servo motor, that is, the rotation accuracy of the servo motor will decrease.

[0052] Furthermore, it is necessary to add a shielding cover on the insulating base 54 and place the driving motor 51 inside the shielding cover.

[0053] For some examples, see Figure 5 The signal detection module 7 includes a housing 71 , an ultraviolet sensing crystal 72 , a photomultiplier tube 73 and a detection circuit 74 . The ultraviolet sensing crystal 72 and the photomultiplier tube 73 are both located inside the housing 71 , and the detection circuit 74 is electrically connected to the photomultiplier tube 73 .

[0054] Ultraviolet rays excite the ultraviolet sensing crystal 72 to generate light, which can be sensed by the photomultiplier tube 73 and generate current. The current is detected by the detection circuit 74. The analysis here refers to the detection of the current value, and the detection will obtain a corresponding curve of current and time.

[0055] In some possible implementations, the detection circuit 74 is externally connected to a communication module, and the communication module sends the data obtained by the detection circuit 74 to the processor for processing. Of course, the processor can also be integrated inside the detection circuit 74.

[0056] In some possible implementations, the second end of the sampling optical fiber 6 abuts against the ultraviolet sensing crystal 72 .

[0057] In some possible implementations, a fiber optic plug is installed on the second end of the sampling optical fiber 6 , and the fiber optic plug is connected to the housing 71 via a connector.

[0058] In some possible implementations, the ultraviolet sensing crystal 72 uses a GaN crystal or a ZnS crystal.

[0059] For the control of the drive motor 51, a controller and a servo driver are required. The controller can use a single chip microcomputer (89C51) or a PLC. The signal output end of the controller is electrically connected to the servo driver, and the drive motor 51 is electrically connected to the servo driver.

[0060] The controller also communicates with the train to obtain the train's running speed. According to the running speed and the inherent parameters of the bow net, the position of the sliding body 4 can be dynamically adjusted; or it is connected to an image analysis module (composed of an image sensor and an image processor). The function of the image analysis module is to obtain the position changes of the cables on the bow net and guide the sliding body 4 to adjust its position.

[0061] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle-mounted arc detector for a pantograph, characterized in that: include: A connecting piece (1) is used for being fixedly mounted on the bow frame; A sampling rod (2) is arranged on the connecting member (1); A balancing body (3) is arranged on the connecting member (1), and the balancing body (3) and the sampling rod (2) are respectively located on two sides of the connecting member (1); A sliding body (4) is disposed on the sampling rod (2) and is slidably connected to the sampling rod (2); A bidirectional driver (5) configured to drive the sliding body (4) to slide back and forth on the sampling rod (2); A sampling optical fiber (6), a first end of which is arranged on the sliding body (4); The signal detection module (7) is connected to the second end of the sampling optical fiber (6).

2. The vehicle-mounted arc detector for the pantograph-catenary according to claim 1, characterized in that: A collecting port (41) is provided on the sliding body (4), and the first end of the sampling optical fiber (6) is located at the bottom of the collecting port (41).

3. The vehicle-mounted arc detector for the pantograph-catenary according to claim 2, characterized in that: In a direction close to the first end of the sampling optical fiber (6), the cross-sectional area of ​​the collecting port (41) tends to decrease.

4. The vehicle-mounted arc detector for the pantograph-catenary according to claim 1, characterized in that: The bidirectional driver (5) comprises: A symmetrically arranged drive motor (51); A guide wheel (52) is arranged on the rotating shaft of the driving motor (51); and A driving rope (53) is wound around the guide wheel (52); Wherein, the two driving ropes (53) are both connected to the sliding body (4).

5. The vehicle-mounted arc detector for the pantograph-catenary according to claim 4, characterized in that: It also includes an insulating base (54), and the drive motors (51) are all arranged on the insulating base (54).

6. The vehicle-mounted arc detector for pantograph-catenary according to claim 1, characterized in that: The signal detection module (7) includes: Shell (71); The ultraviolet light sensing crystal (72) and the photomultiplier tube (73) are both arranged inside the housing (71); A detection circuit (74) electrically connected to the photomultiplier tube (73); The second end of the sampling optical fiber (6) is abutted against the ultraviolet sensing crystal (72).

7. The vehicle-mounted arc detector for the pantograph-catenary according to claim 6, characterized in that: The ultraviolet light sensing crystal (72) is in contact with the photomultiplier tube (73).

8. The vehicle-mounted arc detector for the pantograph-catenary according to claim 6 or 7, characterized in that: The ultraviolet light sensing crystal (72) includes a GaN-based crystal and a ZnS-based crystal.

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