CN112611313A - Rail vehicle length measuring device, rail vehicle length measuring method and traffic facility - Google Patents
Rail vehicle length measuring device, rail vehicle length measuring method and traffic facility Download PDFInfo
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- CN112611313A CN112611313A CN202011461894.6A CN202011461894A CN112611313A CN 112611313 A CN112611313 A CN 112611313A CN 202011461894 A CN202011461894 A CN 202011461894A CN 112611313 A CN112611313 A CN 112611313A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/04—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B7/042—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
- G01B7/046—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length using magnetic means
Abstract
The invention relates to the technical field of railway vehicles, and provides a length measuring device and a length measuring method for a railway vehicle and traffic facilities, wherein the length measuring device comprises: switches, sleepers and geomagnetic sensors; the turnout comprises a plurality of rails which are arranged at intervals; a plurality of the sleepers are arranged between two adjacent rails at intervals along the extending direction of the rails; the geomagnetic sensor is connected with the sleeper and used for monitoring the change data of the magnetic field under the action of the wheel pair when the rail vehicle passes through. According to the device, the number of wheel pairs passed by each turnout is obtained by measuring the change of magnetic field data when the wheel pairs of the rail vehicle pass by, so that the length of the rail vehicle is obtained.
Description
Technical Field
The invention relates to the technical field of rail vehicles, in particular to a rail vehicle length measuring device, a rail vehicle length measuring method and a traffic facility.
Background
In a heavy haul railway, each train is connected by a plurality of carriage units, each carriage unit is heavy after loading, when the train passes through a railway turnout part, wheels of the train have great influence on the turnout, and particularly, when the train is used on one side for a long time, the problem is more easily caused. Each turnout generates certain damage after passing through a certain weight of goods, and the turnout is required to be paid special attention or replaced in the later operation and maintenance process. At present, the damage condition of a turnout is mainly judged in a manual observation mode, and the turnout can be checked and maintained only at a specific time; the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee.
Disclosure of Invention
The invention provides a rail vehicle length measuring device, which is used for solving the defects that the damage condition of turnouts in the prior art is mainly judged in a manual observation mode and can only be checked and maintained at specific time, the detection method needs a large amount of manpower, and the detection precision and timeliness are difficult to guarantee.
The invention also provides a rail vehicle length measuring method, which is used for solving the defects that the damage condition of the turnout in the prior art is mainly judged by a manual observation mode, the turnout can only be checked and maintained at a specific time, the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee.
The invention further provides a traffic facility, which is used for solving the defects that the damage condition of the turnout in the prior art is mainly judged by a manual observation mode, the turnout can only be checked and maintained at a specific time, the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee.
According to a first aspect of the present invention there is provided a rail vehicle length measuring apparatus comprising: switches, sleepers and geomagnetic sensors;
the turnout comprises a plurality of rails which are arranged at intervals;
a plurality of the sleepers are arranged between two adjacent rails at intervals along the extending direction of the rails;
the geomagnetic sensor is connected with the sleeper and used for monitoring the change data of the magnetic field under the action of the wheel pair when the rail vehicle passes through.
According to an embodiment of the present invention, at least two of the geomagnetic sensors are disposed at intervals along an extending direction of the rail;
the distance between the sleepers which are adjacently provided with the geomagnetic sensors is at least larger than the distance between the two wheel pairs.
Specifically, the present embodiment provides an implementation in which a geomagnetic sensor is mounted to a switch, and by providing a plurality of geomagnetic sensors on a tie in the rail extending direction, the accuracy of measurement of a rail vehicle passing through the switch is ensured.
Further, the distance between two adjacent geomagnetic sensors is set to be greater than the distance between two wheel pairs, so that the distortion of the magnetic field variation measurement caused by the fact that the two adjacent geomagnetic sensors are too close to each other is avoided, and mutual interference between the two geomagnetic sensors is also avoided.
According to a second aspect of the present invention, a rail vehicle length measuring method based on the rail vehicle length measuring device comprises:
responding to the magnetic field change signal, and acquiring magnetic field data within a preset time length;
extracting magnetic field characteristic values of the magnetic field data;
and generating a statistical result according to the magnetic field characteristic value and outputting the statistical result.
According to an embodiment of the present invention, the step of obtaining the magnetic field data within the preset time period in response to the magnetic field variation signal specifically includes:
if the magnetic field change signal is received again within the preset time length, the magnetic field data are obtained again according to the preset time length, otherwise, the magnetic field data are stopped being obtained.
In particular, the present embodiment provides an implementation of the magnetic field variation signal acquisition, by setting a preset time period, the preset time length is a countdown setting and is used for determining the next operation according to the change of the magnetic field signal, when the magnetic field signal changes, the countdown is started according to the preset time length, during the countdown, the countdown is resumed upon receiving the magnetic field change signal again, which ensures that the magnetic field change due to the passage of the rail vehicle is captured, which, in some cases, when other devices or objects capable of causing the magnetic field change pass by, the magnetic field change is triggered to start counting down according to the preset time length, the rail vehicle is characterized in that a plurality of wheel pairs rapidly pass through the rail vehicle in a short time, so that the magnetic field change is violent, the interval of sending the magnetic field change signal is short, therefore, the preset time length can be set to ensure that the magnetic field change data caused by the passing of the rail vehicle can be acquired.
According to an embodiment of the present invention, the step of obtaining the magnetic field data within a preset time period in response to the magnetic field variation signal specifically includes:
extracting a magnetic field disturbance value corresponding to the magnetic field variation signal in response to the magnetic field variation signal;
comparing the magnetic field disturbance value with a preset disturbance threshold value, wherein the comparison logic is as follows:
if the magnetic field disturbance value is larger than or equal to the preset disturbance threshold value, starting to acquire the magnetic field data within the preset time;
and if the magnetic field disturbance value is smaller than the preset disturbance threshold value, discarding the magnetic field change signal.
Specifically, the embodiment provides an implementation mode for setting a preset disturbance threshold value and then accurately acquiring magnetic field change data, and by comparing a magnetic field disturbance value with the preset disturbance threshold value, the problem that under certain conditions, when other devices or objects capable of causing magnetic field change pass through, magnetic field change is triggered and then magnetic field change data starts to be acquired is avoided, and accuracy of influencing magnetic field change data acquisition on a wheel set of a rail vehicle is enhanced.
According to an embodiment of the present invention, the step of extracting the magnetic field characteristic value of the magnetic field data specifically includes:
acquiring magnetic field disturbance values in the magnetic field data, and forming a magnetic field disturbance sequence by the magnetic field disturbance values in a time sequence;
extracting a first magnetic field disturbance value of the magnetic field disturbance sequence and marking the first magnetic field disturbance value as a first characteristic value;
a second one of the magnetic field perturbation values of the sequence of magnetic field perturbations is extracted and labeled as a second eigenvalue.
Specifically, the embodiment provides an implementation manner for extracting magnetic field data, and provides a basis for subsequent calculation according to a comparison algorithm by acquiring a first magnetic field disturbance value and a second magnetic field disturbance value and marking the first magnetic field disturbance value and the second magnetic field disturbance value as a first characteristic value and a second characteristic value.
According to an embodiment of the present invention, the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically includes:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
acquiring the characteristic quantity corresponding to the characteristic length in the magnetic field perturbation sequence, and generating a first characteristic result;
and taking the first characteristic result as the statistical result and outputting the statistical result.
Specifically, the embodiment provides an implementation manner of performing statistics according to magnetic field characteristic values, and the characteristic length between a first characteristic value and a second characteristic value is extracted and compared in the whole magnetic field disturbance sequence, so that a comparison result is obtained to form a first characteristic result, and the first characteristic result is output as a statistical result.
According to an embodiment of the present invention, the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically includes:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
obtaining a suspected characteristic length corresponding to the characteristic length in the magnetic field perturbation sequence;
acquiring the number of intervals of every two suspected feature lengths, and generating a second feature result;
and taking the second characteristic result as the statistical result and outputting the statistical result.
Specifically, in this embodiment, another implementation manner of performing statistics according to the magnetic field feature value is provided, in which a feature length between a first feature value and a second feature value is extracted, and the number of intervals between two adjacent suspected feature lengths having the feature length in the magnetic field perturbation sequence is counted, so as to obtain a comparison result to form a first feature result, and output a second feature result as a statistical result.
It should be noted that, during the setting, the wheel pairs arranged on the rail vehicle are not equally distributed under certain conditions, for example, the wheel pairs of the vehicle head and the vehicle carriage, or the wheel pairs are unevenly spaced when different vehicle carriages are spliced, and there is an error by acquiring the spacing between the inner wheels of the same vehicle carriage, but because the distance between the vehicle head and the vehicle carriage or the connection between the two vehicle carriages is small, and the structural shape is not changed much, two wheel pairs in front of and behind the connection are acquired, so that the number of the wheel pairs of the rail vehicle can be counted more accurately.
According to an embodiment of the present invention, after the step of generating and outputting the statistical result according to the magnetic field characteristic value, the method further includes:
initializing the geomagnetic sensor, and recording the number of the statistical results in a preset period.
Particularly, this embodiment provides an implementation mode of making statistics of rail vehicle, and after measuring at every turn, all initialize geomagnetic sensor, guaranteed that geomagnetic sensor does not have accumulative error in next use, count the number of times of measuring simultaneously, can count out the rail vehicle quantity through the switch.
According to a third aspect of the present invention, a transportation facility is provided with the above-mentioned rail vehicle length measuring device, or when the rail vehicle length is measured, the above-mentioned rail vehicle length measuring method is executed.
One or more technical solutions in the present invention have at least one of the following technical effects: according to the rail vehicle length measuring device, the rail vehicle length measuring method and the traffic facility, the number of wheel pairs passed by each turnout is obtained by measuring the change of magnetic field data when the wheel pairs of the rail vehicle pass through, so that the length of the rail vehicle is obtained.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of the arrangement of a rail vehicle length measuring device provided by the present invention;
FIG. 2 is a logic diagram of a method for measuring the length of a rail vehicle according to the present invention.
Reference numerals:
10. a turnout;
20. a rail;
30. a sleeper;
40. a geomagnetic sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
FIG. 1 is a schematic diagram of the arrangement of the rail vehicle length measuring device provided by the invention. As can be seen from fig. 1, the present invention is illustrated in fig. 1 for a switch 10, in which a tie 30 is disposed between two rails 20, and a geomagnetic sensor 40 is disposed above the tie 30.
It should be noted that fig. 1 is a schematic diagram only, and the purpose is to show the relative position relationship among the geomagnetic sensor 40, the rail 20, the sleeper 30, and the switch 10, which does not represent the arrangement in practical applications.
FIG. 2 is a logic diagram of a method for measuring the length of a rail vehicle according to the present invention. Fig. 2 shows a flow of the measuring method for measuring the length of the rail vehicle according to the invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In some embodiments of the present invention, as shown in fig. 1, the present solution provides a rail vehicle length measuring device, comprising: the turnout 10, the sleeper 30 and the geomagnetic sensor 40; the switch 10 includes a plurality of spaced rails 20; a plurality of sleepers 30 are arranged at intervals between two adjacent rails 20 in the extending direction of the rails 20; the geomagnetic sensor 40 is connected to the tie 30 and is used for monitoring data of changes of the magnetic field under the action of the wheel pairs when the rail vehicle passes by.
In detail, the invention provides a rail vehicle length measuring device, which is used for solving the defects that in the prior art, the damage condition of turnouts 10 is mainly judged in a manual observation mode and can only be checked and maintained at a specific time, the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee.
In some possible embodiments, at least two geomagnetic sensors 40 are disposed at intervals along the extending direction of the rail 20;
wherein, the distance between sleepers 30 adjacently provided with the geomagnetic sensor 40 is at least larger than the distance between two wheel pairs.
Specifically, the present embodiment provides an embodiment in which the geomagnetic sensor 40 is mounted to the switch 10, and by providing a plurality of geomagnetic sensors 40 on the sleepers 30 in the extending direction of the rail 20, the accuracy of measurement of the rail vehicle passing through the switch 10 is ensured.
Further, the distance between two adjacent geomagnetic sensors 40 is set to be greater than the distance between two wheel pairs, so that the distortion of the magnetic field variation caused by the pair of wheels due to the fact that the two adjacent geomagnetic sensors 40 are too close to each other is avoided, and mutual interference between the two geomagnetic sensors 40 is also avoided.
In some embodiments of the present invention, as shown in fig. 2, the present disclosure provides a rail vehicle length measuring method based on the rail vehicle length measuring device, including:
responding to the magnetic field change signal, and acquiring magnetic field data within a preset time length;
extracting a magnetic field characteristic value of the magnetic field data;
and generating a statistical result according to the magnetic field characteristic value and outputting the statistical result.
In detail, the invention further provides a rail vehicle length measuring method, which is used for solving the defects that in the prior art, the damage condition of the turnout 10 is mainly judged in a manual observation mode, and only inspection and maintenance can be carried out at a specific time, the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee, and the number of wheel sets and the length of the rail vehicle are judged by obtaining disturbance data of the wheel sets on a magnetic field when the rail vehicle passes through, so that a powerful guarantee is provided for the observation of the turnout 10.
In some possible embodiments, the step of acquiring the magnetic field data within the preset time period in response to the magnetic field variation signal specifically includes:
and if the magnetic field change signal is received again within the preset time length, acquiring the magnetic field data again according to the preset time length, otherwise, stopping acquiring the magnetic field data.
In particular, the present embodiment provides an implementation of the magnetic field variation signal acquisition, by setting a preset time period, the preset time length is a countdown setting and is used for determining the next operation according to the change of the magnetic field signal, when the magnetic field signal changes, the countdown is started according to the preset time length, during the countdown, the countdown is resumed upon receiving the magnetic field change signal again, which ensures that the magnetic field change due to the passage of the rail vehicle is captured, which, in some cases, when other devices or objects capable of causing the magnetic field change pass by, the magnetic field change is triggered to start counting down according to the preset time length, the rail vehicle is characterized in that a plurality of wheel pairs rapidly pass through the rail vehicle in a short time, so that the magnetic field change is violent, the interval of sending the magnetic field change signal is short, therefore, the preset time length can be set to ensure that the magnetic field change data caused by the passing of the rail vehicle can be acquired.
In some possible embodiments, the step of acquiring the magnetic field data within a preset time period in response to the magnetic field variation signal specifically includes:
extracting a magnetic field disturbance value corresponding to the magnetic field change signal in response to the magnetic field change signal;
comparing the magnetic field disturbance value with a preset disturbance threshold value, wherein the comparison logic is as follows:
if the magnetic field disturbance value is larger than or equal to a preset disturbance threshold value, starting to acquire magnetic field data within a preset time length;
and if the magnetic field disturbance value is smaller than the preset disturbance threshold value, discarding the magnetic field change signal.
Specifically, the embodiment provides an implementation mode for setting a preset disturbance threshold value and then accurately acquiring magnetic field change data, and by comparing a magnetic field disturbance value with the preset disturbance threshold value, the problem that under certain conditions, when other devices or objects capable of causing magnetic field change pass through, magnetic field change is triggered and then magnetic field change data starts to be acquired is avoided, and accuracy of influencing magnetic field change data acquisition on a wheel set of a rail vehicle is enhanced.
In some possible embodiments, the step of extracting the magnetic field characteristic value of the magnetic field data specifically includes:
acquiring magnetic field disturbance values in the magnetic field data, and forming a magnetic field disturbance sequence by the magnetic field disturbance values in a time sequence;
extracting a first magnetic field disturbance value of the magnetic field disturbance sequence and marking the first magnetic field disturbance value as a first characteristic value;
a second magnetic field perturbation value of the sequence of magnetic field perturbations is extracted and labeled as a second eigenvalue.
Specifically, the embodiment provides an implementation manner for extracting magnetic field data, and provides a basis for subsequent calculation according to a comparison algorithm by acquiring a first magnetic field disturbance value and a second magnetic field disturbance value and marking the first magnetic field disturbance value and the second magnetic field disturbance value as a first characteristic value and a second characteristic value.
In some possible embodiments, the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically includes:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
acquiring the characteristic quantity corresponding to the characteristic length in the magnetic field disturbance sequence, and generating a first characteristic result;
and outputting the first characteristic result as a statistical result.
Specifically, the embodiment provides an implementation manner of performing statistics according to magnetic field characteristic values, and the characteristic length between a first characteristic value and a second characteristic value is extracted and compared in the whole magnetic field disturbance sequence, so that a comparison result is obtained to form a first characteristic result, and the first characteristic result is output as a statistical result.
In some possible embodiments, the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically includes:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
obtaining a suspected characteristic length corresponding to the characteristic length in the magnetic field disturbance sequence;
acquiring the number of intervals of every two suspected feature lengths, and generating a second feature result;
and outputting the second characteristic result as a statistical result.
Specifically, in this embodiment, another implementation manner of performing statistics according to the magnetic field feature value is provided, in which a feature length between a first feature value and a second feature value is extracted, and the number of intervals between two adjacent suspected feature lengths having the feature length in the magnetic field perturbation sequence is counted, so as to obtain a comparison result to form a first feature result, and output a second feature result as a statistical result.
It should be noted that, during the setting, the wheel pairs arranged on the rail vehicle are not equally distributed under certain conditions, for example, the wheel pairs of the vehicle head and the vehicle carriage, or the wheel pairs are unevenly spaced when different vehicle carriages are spliced, and there is an error by acquiring the spacing between the inner wheels of the same vehicle carriage, but because the distance between the vehicle head and the vehicle carriage or the connection between the two vehicle carriages is small, and the structural shape is not changed much, two wheel pairs in front of and behind the connection are acquired, so that the number of the wheel pairs of the rail vehicle can be counted more accurately.
In some possible embodiments, after the step of generating and outputting the statistical result according to the magnetic field characteristic value, the method further includes:
the geomagnetic sensor 40 is initialized, and the number of statistical results is recorded in a preset period.
Specifically, the present embodiment provides an implementation manner for counting rail vehicles, after each measurement, the geomagnetic sensor 40 is initialized, so as to ensure that the geomagnetic sensor 40 has no accumulated error in the next use, and the number of times of measurement is counted, so as to count the number of rail vehicles passing through the switch 10.
In some embodiments of the present invention, the present invention provides a transportation facility, which has a rail vehicle length measuring device as described above, or performs a rail vehicle length measuring method as described above when measuring the length of a rail vehicle.
In detail, the invention further provides a transportation facility, which is used for solving the defects that in the prior art, the damage condition of the turnout 10 is mainly judged by a manual observation mode, and only inspection and maintenance can be carried out at a specific time, the detection method needs a large amount of manual work, and the detection precision and timeliness are difficult to guarantee.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. A rail vehicle length measuring device, comprising: switches, sleepers and geomagnetic sensors;
the turnout comprises a plurality of rails which are arranged at intervals;
a plurality of the sleepers are arranged between two adjacent rails at intervals along the extending direction of the rails;
the geomagnetic sensor is connected with the sleeper and used for monitoring the change data of the magnetic field under the action of the wheel pair when the rail vehicle passes through.
2. The rail vehicle length measuring device according to claim 1, wherein at least two geomagnetic sensors are provided at intervals along an extending direction of the rail;
the distance between the sleepers which are adjacently provided with the geomagnetic sensors is at least larger than the distance between the two wheel pairs.
3. A rail vehicle length measuring method based on the rail vehicle length measuring device according to claim 1 or 2, comprising:
responding to the magnetic field change signal, and acquiring magnetic field data within a preset time length;
extracting magnetic field characteristic values of the magnetic field data;
and generating a statistical result according to the magnetic field characteristic value and outputting the statistical result.
4. The method for measuring the length of the railway vehicle according to claim 3, wherein the step of acquiring the magnetic field data within a preset time period in response to the magnetic field variation signal specifically comprises:
if the magnetic field change signal is received again within the preset time length, the magnetic field data are obtained again according to the preset time length, otherwise, the magnetic field data are stopped being obtained.
5. The method according to claim 3, wherein the step of acquiring the magnetic field data within a preset time period in response to the magnetic field variation signal further comprises:
extracting a magnetic field disturbance value corresponding to the magnetic field variation signal in response to the magnetic field variation signal;
comparing the magnetic field disturbance value with a preset disturbance threshold value, wherein the comparison logic is as follows:
if the magnetic field disturbance value is larger than or equal to the preset disturbance threshold value, starting to acquire the magnetic field data within the preset time;
and if the magnetic field disturbance value is smaller than the preset disturbance threshold value, discarding the magnetic field change signal.
6. The method according to claim 3, wherein the step of extracting the magnetic field characteristic value of the magnetic field data specifically comprises:
acquiring magnetic field disturbance values in the magnetic field data, and forming a magnetic field disturbance sequence by the magnetic field disturbance values in a time sequence;
extracting a first magnetic field disturbance value of the magnetic field disturbance sequence and marking the first magnetic field disturbance value as a first characteristic value;
a second one of the magnetic field perturbation values of the sequence of magnetic field perturbations is extracted and labeled as a second eigenvalue.
7. The rail vehicle length measuring method according to claim 6, wherein the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically comprises:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
acquiring the characteristic quantity corresponding to the characteristic length in the magnetic field perturbation sequence, and generating a first characteristic result;
and taking the first characteristic result as the statistical result and outputting the statistical result.
8. The rail vehicle length measuring method according to claim 6, wherein the step of generating and outputting the statistical result according to the magnetic field characteristic value specifically comprises:
acquiring the characteristic length between the first characteristic value and the second characteristic value;
obtaining a suspected characteristic length corresponding to the characteristic length in the magnetic field perturbation sequence;
acquiring the number of intervals of every two suspected feature lengths, and generating a second feature result;
and taking the second characteristic result as the statistical result and outputting the statistical result.
9. The rail vehicle length measuring method according to any one of claims 3 to 8, wherein after the step of generating and outputting the statistical result according to the magnetic field characteristic value, the method further comprises:
initializing the geomagnetic sensor, and recording the number of the statistical results in a preset period.
10. A transportation facility, characterized in that, when a rail vehicle length measuring device as claimed in claim 1 or 2 is provided or a rail vehicle length measuring method as claimed in any one of claims 3 to 9 is performed when a rail vehicle length is measured.
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