Protection method and system for driving asynchronization in turnout rotation process under multi-machine traction

Abstract

The invention discloses a protection method and system for driving asynchronization in the turnout rotation process under multi-machine traction, and relates to the technical field of rail transit, and the method comprises the steps that in the turnout rotation process under multi-machine traction, after an electronic execution unit receives a turnout control command from a logic operation unit, the logic operation unit is started; a turnout switching detection starting instruction is sent to the sensor data processing host, the sensor data processing host starts collection according to the instruction and processes collected data, whether the turnout steel rail is stressed abnormally and has driving asynchronization or not is judged, and when it is judged that driving asynchronization exists, driving asynchronization information is fed back to the electronic execution unit; and the electronic execution unit controls all the switch machines for pulling the turnout to stop driving. According to the invention, the problem that the asynchronous action cannot be judged in the turnout rotation process in the existing technical scheme is solved, and the fault supervision and protection of the turnout rotation full life cycle are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and more particularly to a method and system for protecting against asynchronous driving during the rotation of a turnout under multi-machine traction. Background Art

[0002] At present, due to the increase in the operating speed of rail transit, large-number turnouts are widely used. The traction of large-number turnouts often requires multiple switch machines to perform position conversion synchronously (i.e., multi-machine traction). However, when multi-machine traction is applied, if the multi-machine actions are not synchronous under specific circumstances, it will cause damage to the turnout.

[0003] In response to this problem, in the existing technical solutions (including the relay circuit control solution and the turnout control module control solution), only when the switch machine starts, the synchronous start supervision and protection of the multi-machine are realized by checking whether the motor of the switch machine starts normally. If a certain switch machine fails to start, a cut-off command is output to cut off the control circuit of all switch machines, so that all switch machines stop driving; however, the scenario of asynchronous actions of all switch machines after all switch machines have started normally has not been protected.

[0004] In the existing all-electronic control solution, the synchronous supervision and protection logic during multi-machine start-up is that the turnout control module supervises the start-up status of each switch machine and sends the status information to the interlocking logic operation unit. When the logic operation unit determines that the start-up is asynchronous based on the start-up status information of each switch machine, it generates a cut-off command and sends it to the turnout control module. The turnout control module cuts off the action power of the switch machine according to the cut-off command of the logic operation unit, so that the switch machine stops driving. The interaction process between the turnout control module and the logic operation unit lengthens the response time of the system when asynchronous occurs, increasing the risk of damage to the turnout. Summary of the Invention

[0005] In order to overcome the defects existing in the above-mentioned prior art, the present invention discloses a method and system for protecting against asynchronous driving during the rotation of a turnout under multi-machine traction, so as to avoid damaging the turnout equipment when the switch machines act asynchronously during the rotation of the turnout.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In the first aspect, the present invention provides a method for protecting against asynchronous driving during the rotation of a turnout under multi-machine traction, including: during the rotation of the turnout under multi-machine traction, the electronic execution unit sends a start turnout conversion detection instruction and a stop turnout conversion detection instruction to the sensor data processing host, including:

[0008] After the electronic execution unit receives the switch control command from the logic operation unit, it sends a start switch conversion detection instruction to the sensor data processing host. The sensor data processing host starts data acquisition according to the instruction and processes the acquired data, including: sensors at multiple measurement points collect strain signals of the longitudinal force received by the switch point rail, and transmit the strain signals to the sensor data processing host through a data collector. The sensor data processing host draws the force curve of the switch rail according to the force states at multiple measurement points, and monitors whether the change of the force curve of the rail during switch rotation is within the calibrated normal change range. According to the monitoring result, it determines whether there is abnormal force on the switch rail and different driving synchronization. When it is determined that there is different driving synchronization, the information of different driving synchronization is fed back to the electronic execution unit, and the electronic execution unit controls all the switch machines pulling the switch to stop driving;

[0009] After the electronic execution unit detects that the switch conversion is in place or determines that the switch driving has stopped, it sends a stop switch conversion detection instruction to the sensor data processing host, and the sensor data processing host stops data acquisition according to the instruction.

[0010] Preferably, the sensors at multiple measurement points are several high-temperature and high-pressure fiber optic strain sensors, and the several high-temperature and high-pressure fiber optic strain sensors are distributed on the side of each switch point rail. When the fiber optic strain sensor is subjected to an external force, a strain signal is generated through the internal high-temperature fiber optic strain gauge.

[0011] Preferably, the data collector collects the strain signals of each fiber optic strain sensor and transmits the strain signals to the sensor data processing host. The sensor data processing host connects the strain signals fed back by each fiber optic strain sensor to form a continuous broken line composed of multiple line segments, and fits the continuous broken line at multiple measurement points with the force curve of the rail.

[0012] Preferably, a calibration data sample library of the force change curve during the switch conversion process is stored in the sensor data processing host. The calibration data sample library includes a calibration upper limit data sample library S max and a calibration lower limit data sample library S min , and the sensor data processing host uses the calibration upper limit data sample library S max and the calibration lower limit data sample library S min to determine whether there is abnormal force on the switch rail and different driving synchronization.

[0013] Preferably, the acquisition of the calibration upper limit data sample library S max and the calibration lower limit data sample library S min includes the following steps:

[0014] A1. The switch is manipulated to convert normally. The data collector collects the strain signals of the sensor at a period of T and uploads them to the sensor data processing host. The sensor data processing host records all the strain data during the whole process of switch conversion and calibrates it as a set of sample data S 1 ; If n sensors are arranged for a set of switches and the total time from start to conversion in place of the switch is Δt 1 , then the number of sub - data sets in the set of sample data is m = Δt 1 / T. Suppose the sub - data set is K 1j , then the set of sample data is S 1 = {K 11 , K 12 ,...., K 1m}, where K 1j＝ {ε 11 , ε 12 ,...., ε 1n}, and ε 1n is the strain signal collected by the nth sensor;

[0015] A2. Repeat step A1 N times to obtain N sets of sample data sets {S 1 , S 2 ,...., S N}; Suppose the maximum value of the number of sub - data sets in the N sets of data sets is p. Expand the data sets with the number of sub - data sets less than p. The data in the expanded sub - data set is the same as the original last sub - data set of this data set; After expansion, perform weighted average fitting on the sub - data sets in the new N sets of sample data sets to obtain a set of sample data S = {K 1 , K 2 ,...., K p}, where K (x) = {ε 1 , ε 2 ,...., ε n}; Then, based on this sample data, obtain its upper - limit sub - data set K (x) within the sub - data set K (x)max = {ε 1 + Δε, ε 2 + Δε,...., ε n + Δε} and lower - limit sub - data set K (x)min = {ε 1 - Δε, ε 2 - Δε,....,, ε n - Δε} according to ±Δε of the strain signal; The upper - limit sub - data set forms a calibrated upper - limit data sample library S max = {K 1max , K 2max ,...., Kpmax}, the lower limit sub-data set forms a calibrated lower limit data sample library S min = {K 1min , K 2min ,...., K pmin}.

[0016] Preferably, after the sensor data processing host receives the start switch conversion detection instruction from the electronic execution unit, the sensor data processing host controls the data collector to collect the strain signals of the sensor at a period of T and upload them to the sensor data processing host until it receives the stop switch conversion detection instruction. The data set uploaded by the data collector each time is K si = {ε si1 , ε si2 ,...., ε sin}; the sensor data processing host determines whether each ε si in K sij is within the range of [ε ijmin , ε ijmax . ε ijmax is the ε max in K imax in the calibrated upper limit data sample library S ij , and ε ijmin is the corresponding ε min in K imin in the calibrated lower limit data sample library S ij . If there are more than n / 2 ε si in K sij outside the range of [ε ijmin , ε ijmax , it is determined that the switch is under abnormal stress. If the K si sets collected continuously for N times are determined to be under abnormal switch stress, the sensor data processing host determines that the drive is asynchronous and sends it to the electronic execution unit.

[0017] Preferably, when the electronic execution unit receives the drive asynchrony information sent by the sensor data processing host, it controls to cut off the drive power of all the switch machines that pull the switch, so that the corresponding switch machines stop driving.

[0018] In a second aspect, based on the above method for protecting against drive asynchrony during the rotation of a switch under multi-machine traction, the present invention also provides a system for protecting against drive asynchrony during the rotation of a switch under multi-machine traction, including an optical fiber strain sensor, a data collector, a sensor data processing host, and an electronic execution unit;

[0019] A number of the optical fiber strain sensors are provided, and are communicatively connected to the data collector and distributed on the side of each switch point rail, for collecting the strain signals of the longitudinal forces received by multiple measurement points of the switch point rail;

[0020] The data collector is connected to the sensor data processing host, and is used to collect the strain signals of a plurality of fiber optic strain sensors and transmit the strain signals to the sensor data processing host;

[0021] The sensor data processing host is communicatively connected to the electronic execution unit, and is used to draw the stress curve of the turnout rail according to the stress states of multiple measuring points, and monitor whether the change of the stress curve of the rail during the turnout rotation is within the calibrated normal change range. According to the monitoring result, it determines whether there is abnormal stress and drive asynchrony in the turnout rail. When it is determined that there is drive asynchrony, it feeds back the drive asynchrony information to the electronic execution unit; at the same time, it receives the start turnout conversion detection instruction and the stop turnout conversion detection instruction sent by the electronic execution unit, and starts and stops the collection according to the instructions;

[0022] The electronic execution unit is used to send the start turnout conversion detection instruction and the stop turnout conversion detection instruction to the sensor data processing host. After receiving the drive asynchrony information, the electronic execution unit controls all the switch machines pulling the turnout to stop driving.

[0023] Preferably, the electronic execution unit includes a communication module and a turnout control module. The communication module is used to interact information with the logic operation unit and the sensor data processing host. The turnout control module is used for driving the switch machine and collecting the representation information of the switch machine. One turnout control module drives one switch machine. When multiple machines are used for traction, a group of turnouts are driven by multiple turnout control modules to jointly pull multiple switch machines.

[0024] Preferably, in the electronic execution unit:

[0025] When the communication module receives a valid turnout operation command for a certain turnout from the logic operation unit, it issues a turnout control command to all the turnout control modules controlling the turnout. After receiving the turnout control command, the turnout control module drives the switch machine; at the same time, it sends a valid start turnout conversion detection instruction to the sensor data processing host;

[0026] The turnout control module collects the representation information of the switch machine from the switch machine and sends it to the communication module. After the communication module detects that the representations of all the switch machines controlling the turnout are in place, it considers that the turnout drive is in place, and sends the total representation information of the turnout to the logic operation unit for logical operation. At the same time, it sends a valid stop turnout conversion detection instruction to the sensor data processing host;

[0027] After the communication module receives the drive out-of-sync information from the sensor data processing host, it immediately sends a stop drive instruction to all turnout control modules that control the turnout. After receiving the stop drive instruction, the turnout control module cuts off the drive power supply of the switch machine and feeds back to the communication module that the drive state of the switch machine is stopped. After the communication module detects that the drive states of all turnout control modules are in the stopped drive state, it sends a valid stop turnout conversion detection instruction to the sensor data processing host.

[0028] Advantages of the present invention:

[0029] 1. Based on the high-temperature and high-pressure sensors, the present invention directly monitors the stress state of the turnout in real time, and judges the traction out-of-sync according to the change of its stress state. Compared with the prior art that indirectly judges the turnout movement out-of-sync according to the state of the switch machine motor, it has higher accuracy.

[0030] 2. The present invention solves the problem in the prior art that it is impossible to judge the out-of-sync during the turnout rotation process, and realizes the fault supervision and protection of the entire life cycle of the turnout rotation.

[0031] 3. The out-of-sync cut-off logic of the present invention is implemented in the turnout control module, which responds quickly to faults and reduces the risk of turnout damage. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the drive out-of-sync protection system during the turnout rotation under multi-machine traction of the present invention;

[0033] Figure 2 It is a processing flow chart of the electronic execution unit of the present invention. Detailed Embodiments

[0034] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present invention in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present invention.

[0035] Embodiment 1

[0036] A method for protecting against drive out-of-sync during the turnout rotation under multi-machine traction includes the following steps:

[0037] 1) Distributively arrange a number of high-temperature and high-pressure fiber optic force sensors on the side of each turnout switch rail to obtain the strain signal of the longitudinal force received by the switch rail;

[0038] 2) Transmit the strain signals fed back by the sensors to the sensor data processing host through the data collector. The sensor data processing host draws the force curve of the rail according to the stress states of multiple measurement points, monitors whether the change in the force curve of the rail during the turnout rotation is within the calibrated normal change range, determines the existence of asynchronous drive due to abnormal rail force according to the monitoring results, and feeds back the asynchronous drive information to the electronic execution unit;

[0039] 3) The electronic execution unit sends a turnout conversion detection start instruction and a turnout conversion detection stop instruction to the sensor data processing host. When the electronic execution unit receives the turnout control command from the logic operation unit, it sets the turnout conversion detection start instruction to be valid. After receiving it, the sensor data processing host controls the data collector to start collecting and processes the collected data. When the electronic execution unit detects that the turnout conversion is in place or determines that the turnout drive has stopped, it sets the turnout conversion detection stop instruction to be valid and the turnout conversion detection start instruction to be invalid. After receiving it, the sensor data processing host controls the data collector to stop collecting.

[0040] 4) If the electronic execution unit receives the asynchronous drive information during the turnout drive, it controls all the switch machines pulling the turnout to stop driving to avoid damaging the turnout.

[0041] Detailed description:

[0042] Distribute several high-temperature and high-pressure optical fiber force sensors on the side of each turnout switch rail. When the sensor is subjected to an external force, it will generate a strain signal through the internal high-temperature optical fiber strain gauge.

[0043] The data collector collects the strain signals of each sensor and transmits them to the sensor data processing host. The sensor data processing host connects the strain signals fed back by each sensor to form a continuous broken line composed of multiple line segments. When there are enough measurement points, the broken line of multiple measurement points and the force curve of the rail can reach a high-fitting state. The calibration data sample library of the force change curve during the turnout conversion should be stored in advance in the sensor data processing host. The calibration data sample library includes the calibration upper limit data sample library S max and the calibration lower limit data sample library S min , and the acquisition steps are as follows:

[0044] (1) Operate the turnout to convert normally. The data collector collects the strain signals of the sensors at a cycle of 50 ms and uploads them to the data processing host. The sensor data processing host records all the strain data during the whole process of turnout conversion and calibrates it as a set of sample data S 1 . If a set of turnouts is equipped with n sensors and the total time from the start to the conversion in place of the turnout is Δt 1 , then the number of sub-data sets in the set of sample data is m = Δt 1 / 50 (rounded down), assuming the sub - data set is K 1j , then the sample data set is S 1 ={K 11 , K 12 ,...., K 1m}, where K 1j＝ {ε 11 , ε 12 ,...., ε 1n};

[0045] (2) Repeat step (1) 20 times to obtain 20 groups of sample data sets {S 1 , S 2 ,...., S 20}. The number of sub - data sets in the 20 groups of sample data sets may be inconsistent due to the inconsistent total time for the turnout to switch in place. Therefore, assume the maximum value of the number of sub - data sets in the 20 groups of data sets is p, and expand the data sets with the number of sub - data sets less than p. The data in the expanded sub - data sets is the same as the last group of the original sub - data sets of the data set. After expansion, perform weighted average fitting on the sub - data sets in the new 20 groups of sample data sets to obtain a group of sample data S = {K 1 , K 2 ,...., K p}, where K (x) ={ε 1 , ε 2 ,...., ε n}. Then, based on this sample data, for the strain signals in its sub - data set K (x) , obtain its upper - limit sub - data set K (x)max ={ε 1 +Δε, ε 2 ,...., ε n +Δε} and lower - limit sub - data set K (x)min ={ε 1 -Δε, ε 2 ,....,, ε n -Δε} according to ±Δε. The upper - limit sub - data set forms the sample data upper - limit set S max ={K 1max , K 2max ,...., K pmax}, and the lower - limit sub - data set forms the sample data lower - limit set S min ={K 1min , K 2min ,...., K pmin}.

[0046] After receiving the start switch conversion detection instruction from the electronic execution unit, the sensor data processing host controls the data collector to collect the strain signals of the sensors at a period of 50 ms and upload them to the sensor data processing host until the stop switch conversion detection instruction is received. The data set uploaded by the data collector each time is K si ={ε si1 ,ε si2 ,....,ε sin}. The sensor data processing host determines whether each ε si in K sij is within the range of [ε ijmin , ε ijmax . ε ijmax is the upper limit data set S max calibrated in the sample library, and ε imax and ε ij in K ijmin are the corresponding ε min in the lower limit data set S imin in K ij . If there are more than n / 2 ε si in K sij outside the range of [ε ijmin , ε ijmax , it is determined that the switch is under abnormal stress. If the K si sets collected continuously 20 times are determined to be under abnormal switch stress, the sensor data processing host determines drive out-of-sync and sends it to the electronic execution unit.

[0047] After receiving the drive out-of-sync information sent by the sensor data processing host, the electronic execution unit controls to cut off the drive power of all the switch machines pulling the switch, so that the corresponding switch machine stops driving, avoiding damage to the switch equipment.

[0048] Embodiment 2

[0049] During the rotation of the switch under multi-machine traction, the drive out-of-sync protection system, as Figure 1 shown, includes fiber optic strain sensors, data collectors, sensor data processing hosts and electronic execution units;

[0050] A number of the fiber optic strain sensors are provided, and are communicatively connected with the data collector and are distributed on the side of each switch point rail, for collecting the strain signals of the longitudinal forces received by multiple measuring points of the switch point rail;

[0051] The data collector is connected to the sensor data processing host, for collecting the strain signals of a number of fiber optic strain sensors and transmitting the strain signals to the sensor data processing host;

[0052] The host for processing sensor data is communicatively connected to the electronic execution unit, and is configured to draw a stress curve of the turnout rail according to the stress states of multiple measurement points, and monitor whether the change in the stress curve of the rail during the turnout rotation is within the calibrated normal change range. Based on the monitoring result, it determines whether there is abnormal stress on the turnout rail and drive asynchrony. When it is determined that there is drive asynchrony, it feeds back the drive asynchrony information to the electronic execution unit. At the same time, it receives the start turnout conversion detection instruction and the stop turnout conversion detection instruction sent by the electronic execution unit, and starts and stops the acquisition according to the instructions.

[0053] The electronic execution unit is configured to send the start turnout conversion detection instruction and the stop turnout conversion detection instruction to the host for processing sensor data. After receiving the drive asynchrony information, the electronic execution unit controls all the switch machines that tow the turnout to stop driving.

[0054] In this embodiment, the drive asynchrony protection system during the turnout rotation under multi-machine traction consists of an optical fiber strain sensor, a data collector, a host for processing sensor data, and an electronic execution unit. The electronic execution unit includes a communication module and a turnout control module. The communication module is mainly responsible for interacting information with the logic operation unit and the host for processing sensor data. The turnout control module is mainly responsible for driving the switch machine and collecting the switch machine indication information. One turnout control module drives one switch machine. During multi-machine traction, a set of turnouts is towed by multiple turnout control modules driving multiple switch machines together.

[0055] As Figure 2 shown, the processing flow of the electronic execution unit is introduced:

[0056] When the communication module receives a valid turnout operation command for a certain turnout from the logic operation control unit, it sends a turnout control command to all the turnout control modules that control the turnout. After receiving the turnout control command, the turnout control module drives the switch machine; at the same time, it sends a valid start turnout conversion detection instruction to the host for processing sensor data. The turnout control module collects the switch machine indication information from the switch machine and sends it to the communication module. After the communication module detects that the indications of all the switch machines that control the turnout are in place, it considers that the turnout drive is in place, and sends the total indication information of the turnout to the logic operation unit for logical operation. At the same time, it sends a valid stop turnout conversion detection instruction to the host for processing sensor data. When the communication module receives the drive asynchrony information from the host for processing sensor data, it immediately sends a stop drive instruction to all the turnout control modules that control the turnout. After receiving the stop drive instruction, the turnout control module cuts off the drive power supply of the switch machine and feeds back the drive state of the switch machine as stopped driving to the communication module. After the communication module detects that the drive states of all the turnout control modules are in the stopped driving state, it sends a valid stop turnout conversion detection instruction to the host for processing sensor data.

[0057] The above has specifically described the embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A method for protecting against drive asynchronism during turnout rotation under multi-machine traction, characterized in that: include: During the turnout rotation process under multi-locomotive traction: When the electronic execution unit receives the switch control command from the logic operation unit, it sends a switch conversion detection start instruction to the sensor data processing host. The sensor data processing host starts collecting and processes the collected data according to the instruction, including: the sensors at multiple measuring points collect the strain signal of the longitudinal force on the switch point rail, and transmit the strain signal to the sensor data processing host through the data collector. The sensor data processing host draws the force curve of the switch rail according to the force state of the multiple measuring points, and monitors whether the change of the force curve of the rail when the switch rotates is within the calibrated normal change range. According to the monitoring results, it is determined whether the switch rail is abnormally stressed and there is a drive asynchronism. When it is determined that there is a drive asynchronism, the drive asynchronism information is fed back to the electronic execution unit, and the electronic execution unit controls all the switch machines that pull the switch to stop driving; When the electronic execution unit detects that the switch is in place or determines that the switch has stopped driving, it sends a stop switch switching detection instruction to the sensor data processing host, and the sensor data processing host stops collecting data according to the instruction.

2. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 1, characterized in that: The sensors at the multiple measuring points are a number of high-temperature and high-pressure optical fiber strain sensors, which are distributedly arranged on the side of each switch point rail. When the optical fiber strain sensor is subjected to external force, a strain signal is generated through its internal high-temperature optical fiber strain gauge.

3. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 2, characterized in that: The data collector collects strain signals from each optical fiber strain sensor and transmits the strain signals to a sensor data processing host. The sensor data processing host connects the strain signals fed back by each optical fiber strain sensor to form a continuous broken line composed of multiple line segments. The multi-measurement point continuous broken line is fitted with the rail force curve.

4. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 1, characterized in that: The sensor data processing host stores a calibration data sample library of the force variation curve during the turnout switching process, and the calibration data sample library includes a calibration upper limit data sample library S max And the calibration lower limit data sample library S min , the sensor data processing host uses the calibration upper limit data sample library S max And the calibration lower limit data sample library S min Determine whether the turnout rails are subjected to abnormal force and whether there is drive asynchrony.

5. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 4, characterized in that: The calibration upper limit data sample library S max And the calibration lower limit data sample library S min The acquisition includes the following steps: A1. Operate the switch normally. The data collector collects the strain signal of the sensor in T cycles and uploads it to the sensor data processing host. The sensor data processing host records all the strain data in the whole process of switch switching and calibrates it as a set of sample data S1. If a set of switches is arranged with n sensors, and the total time from the start to the switch switching is Δt1, then the number of sub-data sets in the set of sample data is m = Δt1 / T. Assuming that the sub-data set is K 1j , then the sample data set is S1={K 11 ,K 12 ,....,K 1m }, where K 1j＝ {ε 11 ,ε 12 ,....,ε 1n }, ε 1n is the strain signal collected by the nth sensor; A2. Repeat step A1 N times to obtain N sets of sample data sets {S1, S2, ...., S N }; The maximum number of sub-datasets in the N data sets is assumed to be p, and the data set with the number of sub-datasets less than p is expanded, and the data in the expanded sub-dataset is consistent with the original last sub-dataset of the data set; after the expansion is completed, the sub-datasets in the new N sample data sets are weighted averaged to fit a set of sample data S = {K1, K2, ...., K p }, where K (x) ={ε1,ε2,....,ε n }; Then based on this sample data, its sub-data set K (x) The strain signal within the range is obtained according to ±Δε, and its upper limit subset K is obtained. (x)max ={ε1+Δε,ε2+Δε,....,ε n +Δε} and the lower limit subset K (x)min ={ε1-Δε,ε2-Δε,....,,ε n -Δε}; the upper limit sub-data set forms the calibration upper limit data sample library S max ={K 1max ,K 2max ,....,K pmax }, the lower limit sub-data set forms the calibration lower limit data sample library S min ={K 1min ,K 2min ,....,K pmin }.

6. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 5, characterized in that: After the sensor data processing host receives the start switch switching detection instruction from the electronic execution unit, the sensor data processing host controls the data collector to collect the strain signal of the sensor in a period of T and upload it to the sensor data processing host until it receives the stop switch switching detection instruction. The data collection device uploads a data set of K each time. si ={ε si1 ,ε si2 ,....,ε sin }; Sensor data processing host determines K si Each ε in sij Is it in [ε ijmin , ε ijmax ] range, ε ijmax The upper limit data sample library S is used to calibrate the max Middle K imax ε ij , ε ijmin The lower limit data sample library S is used to calibrate the min The corresponding K imin ε ij , if K si There are more than n / 2 ε sij In [ε ijmin , ε ijmax ] range, it is judged that the turnout force is abnormal. If the K values ​​collected for N consecutive times are si If the set is judged as abnormal turnout force, the sensor data processing host determines that the drive is out of sync and sends it to the electronic execution unit.

7. The method for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 1, characterized in that: The electronic execution unit receives the drive asynchronous information sent by the sensor data processing host, and controls to cut off the driving power of all the switch machines pulling the turnout, so that the corresponding switch machines stop driving.

8. The drive asynchronism protection system during the turnout rotation process under multi-machine traction is characterized by: It includes an optical fiber strain sensor, a data collector, a sensor data processing host and an electronic execution unit; The optical fiber strain sensors are provided in plurality, and are connected to the data collector in a communication manner and are distributedly arranged on the side of each turnout rail, and are used to collect strain signals of the longitudinal force exerted on multiple measuring points of the turnout rail; The data collector is connected to the sensor data processing host and is used to collect strain signals of a plurality of optical fiber strain sensors and transmit the strain signals to the sensor data processing host; The sensor data processing host is in communication connection with the electronic execution unit, and is used to draw the force curve of the turnout rail according to the force state of multiple measuring points, and monitor whether the change of the force curve of the rail is within the calibrated normal change range when the turnout rotates, and determine whether the turnout rail is abnormally stressed and there is drive asynchrony according to the monitoring result, and when it is determined that there is drive asynchrony, the drive asynchrony information is fed back to the electronic execution unit; at the same time, the start turnout conversion detection instruction and the stop turnout conversion detection instruction sent by the electronic execution unit are received, and the collection is started and stopped according to the instruction; The electronic execution unit is used to send a start switch conversion detection instruction and a stop switch conversion detection instruction to the sensor data processing host. After receiving the drive asynchronous information, the electronic execution unit controls all switch machines pulling the switch to stop driving.

9. The system for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 8, characterized in that: The electronic execution unit includes a communication module and a switch control module. The communication module is used to exchange information with the logic operation unit and the sensor data processing host. The switch control module is used to drive the switch machine and collect the switch machine representation information. One switch control module drives one switch machine. When multiple machines are pulled, a group of switches is driven by multiple switch machines driven by multiple switch control modules.

10. The system for protecting against drive asynchronism during turnout rotation under multi-machine traction as claimed in claim 9, characterized in that: In the electronic execution unit: When the communication module receives a valid turnout operation command from the logic operation unit, it sends a turnout control command to all turnout control modules that control the turnout. After receiving the turnout control command, the turnout control module drives the switch machine; at the same time, it sends a valid start turnout conversion detection instruction to the sensor data processing host; The turnout control module collects the switch machine indication information from the switch machine and sends it to the communication module. After the communication module detects that the indications of all the switch machines controlling the turnout are in place, it considers that the turnout drive is in place, and sends the total indication information of the turnout to the logic operation unit for logic operation, and at the same time sends an effective stop turnout conversion detection instruction to the sensor data processing host; When the communication module receives the drive asynchronous information from the sensor data processing host, it immediately sends a stop drive instruction to all the turnout control modules that control the turnout. After receiving the stop drive instruction, the turnout control module cuts off the drive power of the switch machine and feeds back to the communication module that the drive status of the switch machine is stopped. After the communication module detects that the drive status of all turnout control modules is the stop drive state, it sends a valid stop turnout conversion detection instruction to the sensor data processing host.

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