A distributed turnout close detection system and detection method

Abstract

The present invention relates to a distributed turnout close fit detection system and detection method, wherein the detection system includes a detection node, a gateway, a server and a user terminal; the detection node communicates with the server via the gateway; the user terminal communicates with the server; there are several detection nodes, which are respectively installed on the turnout, and the positions correspond to the positions of the turnout basic rail traction points. The detection method is partially embedded in the detection node, and the other part is embedded in the server, and together they realize the turnout close fit detection. Compared with the prior art, the present invention has the advantages of being able to obtain the dynamic changes of the turnout close fit, good synchronization, easy installation, and high reliability.

Description

Technical Field

[0001] The present invention relates to the field of rail transit safety technology, and in particular to a distributed turnout close contact detection system and detection method. Background Art

[0002] Turnouts are an important part of the railway signal system and are key equipment to ensure railway driving safety and improve driving efficiency. Turnouts are also the main weak link of the track; turnout failures can cause line suspension, driving delays, reduced driving efficiency, and even lead to accidents such as turnout jams, derailments, and collisions.

[0003] Turnouts are affected by multiple factors such as track foundation, switch mechanism, control circuit, etc. Among them, the close fit and opening amount of turnout point rail are important indicators to measure the health status of turnouts. According to railway standards, the opening amount of point rail and center rail of high-speed railway track structure dynamic changes must be less than 3mm. At present, the measurement of the turnout opening is mainly carried out by on-site steel ruler measurement by turnout maintenance personnel, close fit checker, turnout gap monitoring equipment and other methods. There are also some improvements in the prior art for the close fit detection system, such as a railway turnout close fit detection system disclosed in Chinese patent CN209927329U, which includes a close fit force sensor, the close fit force sensor includes a shell and a sensitive element, the sensitive element is used to convert the pressure received into a charge signal, the sensitive element is embedded in the close fit force sensitive area on the surface of one side of the shell, and a packaging sheet is provided on the outside of the sensitive element, and the packaging sheet is used to encapsulate and protect the sensitive element; the shell is located between the locking iron and the locking frame, and the locking iron, the shell, and the locking frame are connected through a fixing bolt, the fixing bolt is used to fix the shell, and the shell is provided with a spring sheet on one side of the fixed bolt penetration part, and the spring sheet is used to reduce the influence of the tightening pressure on the close fit force sensor. The close fit force detection system in this patent has the effects of simple and convenient installation and high reliability, but can only collect single-point data, and cannot obtain the dynamic changes of the close fit amount of the turnout. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a distributed turnout close contact detection system and detection method which can obtain the dynamic changes of the turnout close contact amount, has good synchronization, is easy to install and has high reliability.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A distributed turnout close detection system comprises a detection node, a gateway, a server and a user terminal; the detection node communicates with the server via the gateway; the user terminal communicates with the server; there are several detection nodes, which are respectively installed on the turnout and their positions correspond to the positions of the turnout basic rail traction points.

[0007] Preferably, the detection node includes a displacement sensor and a detection unit;

[0008] The displacement sensor comprises a sensor host, a measuring rod and a measuring magnetic block; the sensor host and the measuring rod are an integrated structure; the sensor host is fixed at the bottom of the turnout base rail, and its position corresponds to the position of the traction point; the measuring magnetic block is fixed at the U-shaped iron of the traction point of the turnout point rail; the installation position of the measuring magnetic block is located above the measuring rod, and the change in the relative position of the measuring magnetic block and the measuring rod will cause the output current of the sensor host to change;

[0009] The detection unit includes an acceleration sensor, an AD conversion circuit, a wireless communication module, an MCU and a power supply module; the acceleration sensor, the AD conversion circuit, the wireless communication module and the power supply module are respectively connected to the MCU; the detection unit is fixed on the turnout base rail, and the detection unit is connected to the displacement sensor.

[0010] More preferably, the turnout close contact detection system is provided with a stainless steel buckle; the sensor host and the measuring magnetic block are respectively fixed on the turnout by the stainless steel buckle.

[0011] More preferably, the power supply module includes a battery and a power chip; the battery is connected to the power chip.

[0012] Preferably, the gateway and the server as well as the server and the user terminal are connected via a wired TCP / IP network.

[0013] A distributed turnout close fit detection method for use in any of the above-mentioned distributed turnout close fit detection systems, the detection method comprising:

[0014] Step 1: After the node is powered on, the node is initialized;

[0015] Step 2: Set timer T1, then enter sleep mode and wait for the timer to end and trigger an interrupt;

[0016] The timer T1 is specifically used to detect the data collection period of the acceleration sensor and displacement sensor in the node;

[0017] Step 3: When the timer T1 ends and triggers an interrupt, it is determined whether the detection node is performing clock synchronization, continuous data collection or data transmission tasks. If the detection node does not perform the above tasks, it is considered that the current detection node is in an idle state. The detection node performs an acceleration sensor and displacement sensor data collection task once, collects acceleration and displacement values, and then executes the step, otherwise, returns to the step;

[0018] Step 4: The detection node determines whether the turnout has passed or switched based on the current and previous P-1 consecutive acceleration and displacement values. If so, the detection node starts to continuously collect acceleration and displacement values ​​at a high frequency, and the collected data is stored in the memory of the detection node until the number of collections reaches M, and the continuous collection ends, and the data is uploaded to the gateway; otherwise, the node uploads data to the gateway once every N single collections, and the node starts timer T1 and goes into sleep;

[0019] Step 5: The server receives the data collected and uploaded by the gateway;

[0020] Step 6: The server obtains the statistical information of the turnout usage based on the data collected by the detection node, including the close contact amount and opening amount information at each traction point of the turnout.

[0021] Preferably, the method for determining whether the turnout has been passed and switched in step 4 is specifically:

[0022] Compare P acceleration values ​​with the vehicle passing threshold H1. If there are P1 acceleration values ​​greater than H1, it is determined that the turnout is passing a vehicle.

[0023] Compare the P displacement values ​​with the switching threshold H2. If there are P2 displacement values ​​greater than H2, it is determined that the turnout is switching.

[0024] The vehicle passing threshold H1 and the conversion threshold H2 are both preset thresholds.

[0025] Preferably, the detection method is provided with a clock synchronization sub-method, comprising:

[0026] Set timer T2, then enter sleep mode and wait for the timer to end and trigger an interrupt;

[0027] The timer T2 is specifically: detecting the node and gateway clock synchronization period;

[0028] When the timer T2 ends and triggers an interrupt, if the detection node is idle, the wireless communication module is set to the network clock synchronization frequency and receives the clock synchronization frame sent by the gateway. Otherwise, the detection node starts the timer T2 and goes to sleep.

[0029] When the detection node receives the clock synchronization frame sent by the gateway, it sets its clock register to the synchronization frame time to achieve clock synchronization of all nodes in the network.

[0030] Preferably, in step 4, the method for detecting the node to send the continuously collected data is:

[0031] When a node sends continuous acquisition data, it first sends a FILE_UP_REQ frame to notify the gateway of the data volume and waits for a reply;

[0032] If the FILE_UP_ACK frame is not received from the gateway, the FILE_UP_REQ frame will be resent, and the FILE_UP frame will be sent again until the corresponding FILE_UP_ACK frame is received from the gateway, and then the stored data will be uploaded in sequence.

[0033] After the node sends all the data, it sends a FILE_UP_DONE frame to notify the gateway that all data sending is completed;

[0034] The gateway parses all received data and asks the node to resend the lost data frames;

[0035] The node repeatedly sends the data frame with the corresponding number;

[0036] Repeat the above process until the gateway receives all the continuous collected data.

[0037] Preferably, in step 4, the method for detecting the node sending single collection data is:

[0038] The detection node directly uploads a single acquisition sensor data frame DATA_UP, including the node address code, time and sensor data.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. Ability to obtain the close contact amount of the turnout with good synchronization: The distributed turnout close contact detection system and detection method in the present invention can realize high-frequency collection of the close contact amount of the turnout during the turnout passing and turnout switching process, and the measuring magnetic block can move with the point rail to measure the close contact amount of the turnout in the whole process of turnout switching, which greatly improves the monitoring accuracy; at the same time, the detection system installs detection equipment at each traction point of the straight basic rail and the curved basic rail of the turnout, which can realize the synchronous detection of the action of each traction point during the turnout rotation process, which greatly improves the real-time monitoring.

[0041] 2. Easy installation and high reliability: The outdoor turnout close detection node in the distributed turnout close detection system of the present invention is powered by a battery and communicates with the gateway wirelessly, without the need to lay transmission and power cables; the detection node is fixed to the base rail by special fasteners, which is easy to install and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the turnout close contact detection system in the present invention;

[0043] Figure 2 It is a schematic diagram of a detection node installed on a 5-machine movable center track switch in an embodiment of the present invention;

[0044] Figure 3 It is a structural schematic diagram of the detection node in the present invention;

[0045] Figure 4 It is a schematic diagram of the flow of part of the detection method embedded in the detection node in the present invention;

[0046] Figure 5 It is a protocol diagram of the detection node and the gateway transmitting the continuously collected data in the embodiment of the present invention.

[0047] The numbers in the figure show:

[0048] 1. Detection node, 2. Gateway, 3. Server, 4. User terminal;

[0049] 11. displacement sensor, 111. sensor host, 112. measuring rod, 113. measuring magnetic block;

[0050] 12. Detection unit, 121. Acceleration sensor, 122. AD conversion circuit, 123. Wireless communication module, 124. MCU, 125. Power supply module, 1251. Battery, 1252. Power chip. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] A distributed turnout close detection system, the structure of which is as follows Figure 1 and Figure 2 As shown, the close detection system includes a detection node 1, a gateway 2, a server 3 and a user terminal 4. The detection node 1 communicates with the server 3 through the gateway 2, and the user terminal 4 communicates with the server 3. There are several detection nodes 1, which are respectively installed on the turnout, and their positions correspond to the positions of the turnout basic rail traction points.

[0053] The detection node 1 includes a displacement sensor 11 and a detection unit 12, wherein the displacement sensor 11 includes a sensor host 111, a measuring rod 112 and a measuring magnet 113. The sensor host 111 and the measuring rod 112 are an integrated structure. The sensor host 111 is fixed at the bottom of the turnout basic rail close to the traction point, and the position corresponds to the traction point. The measuring magnet 113 is fixed at the U-shaped iron at the traction point of the turnout point rail. The installation position of the measuring magnet 113 is above the measuring rod 112. Changes in the relative position of the measuring magnet 113 and the measuring rod 112 will cause changes in the output current of the sensor host.

[0054] The result of the detection unit 12 is as follows Figure 3As shown, it includes an acceleration sensor 121, an AD conversion circuit 122, a wireless communication module 123, an MCU124 and a power supply module 125. The acceleration sensor 121, the AD conversion circuit 122, the wireless communication module 123 and the power supply module 125 are respectively connected to the MCU124, the detection unit 12 is fixed on the turnout basic rail, and the detection unit 12 is connected to the displacement sensor 11.

[0055] In this embodiment, the turnout close detection system is provided with a stainless steel buckle, and the sensor host 111 and the measuring magnetic block 113 are fixed on the turnout by the stainless steel buckle. The power supply module 125 includes a battery 1251 and a power chip 1252, and the battery 1251 is connected to the power chip 1252. The gateway 2 and the server 3, as well as the server 3 and the user terminal 4 are connected through a wired TCP / IP network.

[0056] The battery 1251 and the power chip 1252 in the detection unit 12 provide a stable power supply to each chip in the detection unit. The displacement sensor 11 outputs an analog current which is converted into a digital form after passing through the AD conversion circuit 12. The MCU controls the collection of the AD conversion circuit 122 to obtain the current output by the displacement sensor 11. Similarly, a displacement sensor 11 that outputs a digital current value can be selected. The MCU 124 of the detection unit 12 directly obtains the current value of the displacement sensor, and the detection unit 12 does not need an AD conversion part. In addition, a displacement sensor 11 that outputs a voltage can also be selected, and only the current-to-voltage part of the AD conversion circuit 122 needs to be omitted.

[0057] The acceleration sensor 121 is used to measure the vibration of the track, and the wireless communication module 123 realizes communication with the gateway 2, and realizes the interactive function of collecting data upload and background control commands. The wireless communication module 122 can adopt low-power Internet of Things communication modules such as LoRa, Zigbee, Bluetooth, WLAN, etc.

[0058] The detection unit 12 is fixed on the turnout stock rail, connected to the displacement sensor 11, provides power to the displacement sensor 11, and collects the output current value thereof.

[0059] The gateway 2 is responsible for communicating with the detection node 1 to realize the transmission of collected data and control commands with the node. The server 3 is responsible for the functions of turnout data storage, analysis, display, etc., as well as node control and providing services for user terminals 4 to view turnout data. Railway staff view turnout data on user terminals 4 and manage the system.

[0060] This embodiment also relates to a detection method for the above detection system, and its process is as follows: Figure 4 As shown, including:

[0061] Step 1: After the node is powered on, the node is initialized;

[0062] Step 2: Set timer T1, then enter sleep mode and wait for the timer to end and trigger an interrupt;

[0063] The timer T1 is specifically used to detect the data collection period of the acceleration sensor and displacement sensor in the node;

[0064] Step 3: When the timer T1 ends and triggers an interrupt, it is determined whether the detection node is performing clock synchronization, continuous data collection or data transmission tasks. If the detection node does not perform the above tasks, it is considered that the current detection node is in an idle state. The detection node then performs an acceleration sensor and displacement sensor data collection task once to collect acceleration and displacement values, and then executes step 4. Otherwise, it returns to step 2.

[0065] Step 4: The detection node determines whether the turnout has passed or switched based on the current and previous P-1 consecutive acceleration and displacement values. If so, the detection node starts to continuously collect acceleration and displacement values ​​at a high frequency, and the collected data is stored in the memory of the detection node until the number of collections reaches M, and the continuous collection ends, and the data is uploaded to the gateway; otherwise, the node uploads data to the gateway once every N single collections, and the node starts timer T1 and goes into sleep;

[0066] Step 5: The server receives the data collected and uploaded by the gateway;

[0067] Step 6: The server obtains the statistical information of the turnout usage based on the data collected by the detection node, including the close contact amount and opening amount information at each traction point of the turnout.

[0068] In the above steps, steps 1 to 4 are embedded in the detection node 1 , and steps 5 and 6 are embedded in the server 3 .

[0069] The method for judging whether the turnout has been passed and switched in step 4 is as follows:

[0070] Compare P acceleration values ​​with the vehicle passing threshold H1. If there are P1 acceleration values ​​greater than H1, it is determined that the turnout is passing a vehicle.

[0071] Compare the P displacement values ​​with the switching threshold H2. If there are P2 displacement values ​​greater than H2, it is determined that the turnout is switching.

[0072] The vehicle passing threshold H1 and the conversion threshold H2 are both preset thresholds.

[0073] The detection method in this embodiment is provided with a clock synchronization sub-method, including:

[0074] Set timer T2, then enter sleep mode and wait for the timer to end and trigger an interrupt;

[0075] The timer T2 is specifically: detecting the node and gateway clock synchronization period;

[0076] When the timer T2 ends and triggers an interrupt, if the detection node is idle, the wireless communication module is set to the network clock synchronization frequency and receives the clock synchronization frame sent by the gateway. Otherwise, the detection node starts the timer T2 and goes to sleep.

[0077] When the detection node receives the clock synchronization frame sent by the gateway, it sets its clock register to the synchronization frame time to achieve clock synchronization of all nodes in the network.

[0078] like Figure 5 As shown, the method for detecting the node to send continuous collection data in step 4 is:

[0079] When a node sends continuous acquisition data, it first sends a FILE_UP_REQ frame to notify the gateway of the data volume and waits for a reply;

[0080] If the FILE_UP_ACK frame from the gateway is not received, the FILE_UP_REQ frame will be resent until the corresponding FILE_UP_ACK frame from the gateway is received and then the FILE_UP frame will be sent to upload the stored data in sequence; the FILE_UP frame contains information such as the node address code, frame number, sensor data, etc.

[0081] After the node sends all the data, it sends a FILE_UP_DONE frame to notify the gateway that all data sending is completed;

[0082] The gateway parses all received data and asks the node to resend the lost data frames;

[0083] The node repeatedly sends the data frame with the corresponding number;

[0084] Repeat the above process until the gateway receives all the continuous collected data.

[0085] The method for the detection node to send single collection data in step 4 is:

[0086] The detection node directly uploads a single acquisition sensor data frame DATA_UP, including the node address code, time and sensor data, without the need for a gateway reply confirmation.

[0087] In this embodiment, when the detection node 1 uploads data, it randomly selects a frequency point and listens whether there is any transmission in the air. If the frequency point is idle, it starts to send data, otherwise it waits for a period of time and listens again.

[0088] In the detection method of this embodiment, when data communication is performed, a retransmission mechanism is designed for all frames except DATA_UP and FILE_UP frames, and the sender repeats the transmission when the sender does not receive a response confirmation frame from the receiver.

[0089] The detection node sends continuous collected data at a fixed frequency.

[0090] In addition, before the node receives the clock synchronization frame from the gateway for the first time, the wireless module needs to be set to the synchronization frequency to continuously listen until the clock synchronization frame is received for the first time. Then the cyclic periodic acquisition and clock synchronization will begin.

[0091] The gateway continuously listens to and receives data at multiple frequencies, and broadcasts synchronization frames at a fixed frequency according to the T2 cycle. The gateway and node clock synchronization use a common single frequency. The gateway sends the received node single acquisition data and complete continuous acquisition data to the server.

[0092] The server analyzes the data and stores it in the database, allowing railway staff to view the close contact and opening amount at each traction point of the turnout through the user terminal, the close contact and opening curves when the turnout passes, and the action curves of each traction point when the turnout is switched.

[0093] The server can obtain statistical information on turnout usage by analyzing the data collected by the nodes, including the amount of close contact and the amount of opening at each traction point of the turnout. Through multiple preset thresholds, the health level of the turnout can be judged for reference by the staff.

[0094] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A distributed turnout close fit detection method for a distributed turnout close fit detection system, characterized in that: The close contact detection system comprises a detection node (1), a gateway (2), a server (3) and a user terminal (4); the detection node (1) communicates with the server (3) through the gateway (2); the user terminal (4) communicates with the server (3); the number of the detection nodes (1) is several, and they are respectively installed on the turnout, and the positions correspond to the positions of the turnout basic rail traction points; The detection method comprises: Step 1: After the node is powered on, the node is initialized; Step 2: Set timer T1, then enter sleep mode and wait for the timer to end and trigger an interrupt; The timer T1 is specifically used to detect the data collection period of the acceleration sensor and displacement sensor in the node; Step 3: When the timer T1 ends and triggers an interrupt, it is determined whether the detection node is performing clock synchronization, continuous data collection or data transmission tasks. If the detection node does not perform the above tasks, it is considered that the current detection node is in an idle state. The detection node then performs an acceleration sensor and displacement sensor data collection task once to collect acceleration and displacement values, and then executes step 4. Otherwise, it returns to step 2. Step 4: The detection node determines whether the turnout has passed or switched based on the current and previous P-1 consecutive acceleration and displacement values. If so, the detection node starts to continuously collect acceleration and displacement values ​​at a high frequency, and the collected data is stored in the memory of the detection node until the number of collections reaches M, and the continuous collection ends, and the data is uploaded to the gateway; otherwise, the node uploads data to the gateway once every N single collections, and the node starts timer T1 and goes into sleep; Step 5: The server receives the data collected and uploaded by the gateway; Step 6: The server obtains the statistical information of the turnout usage according to the data collected by the detection node, including the close contact amount and opening amount information at each traction point of the turnout; The method for judging whether the turnout has been passed and switched in step 4 is specifically as follows: Compare P acceleration values ​​with the vehicle passing threshold H1. If there are P1 acceleration values ​​greater than H1, it is determined that the turnout is passing a vehicle. Compare the P displacement values ​​with the switching threshold H2. If there are P2 displacement values ​​greater than H2, it is determined that the turnout is switching. The vehicle passing threshold H1 and the conversion threshold H2 are both preset thresholds.

2. The distributed turnout close contact detection method according to claim 1 is characterized in that: The detection node (1) comprises a displacement sensor (11) and a detection unit (12); The displacement sensor (11) comprises a sensor host (111), a measuring rod (112) and a measuring magnetic block (113); the sensor host (111) and the measuring rod (112) are an integrated structure; the sensor host (111) is fixed at the bottom of the turnout base rail, and its position corresponds to the position of the traction point; the measuring magnetic block (113) is fixed at the U-shaped iron of the traction point of the turnout point rail; the installation position of the measuring magnetic block (113) is located above the measuring rod (112), and a change in the relative position of the measuring magnetic block (113) and the measuring rod (112) will cause a change in the output current of the sensor host; The detection unit (12) comprises an acceleration sensor (121), an AD conversion circuit (122), a wireless communication module (123), an MCU (124) and a power supply module (125); the acceleration sensor (121), the AD conversion circuit (122), the wireless communication module (123) and the power supply module (125) are respectively connected to the MCU (124); the detection unit (12) is fixed on the turnout base rail, and the detection unit (12) is connected to the displacement sensor (11).

3. The distributed turnout close contact detection method according to claim 2 is characterized in that: The turnout close contact detection system is provided with a stainless steel buckle; the sensor host (111) and the measuring magnetic block (113) are respectively fixed on the turnout through the stainless steel buckle.

4. The distributed turnout close contact detection method according to claim 2 is characterized in that: The power supply module (125) comprises a battery (1251) and a power chip (1252); the battery (1251) is connected to the power chip (1252).

5. The distributed turnout close contact detection method according to claim 1, characterized in that: The gateway (2) and the server (3) as well as the server (3) and the user terminal (4) are connected via a wired TCP / IP network.

6. The distributed turnout close contact detection method according to claim 1, characterized in that: The detection method is provided with a clock synchronization sub-method, including: Set timer T2, then enter sleep mode and wait for the timer to end and trigger an interrupt; The timer T2 is specifically: detecting the node and gateway clock synchronization period; When the timer T2 ends and triggers an interrupt, if the detection node is idle, the wireless communication module is set to the network clock synchronization frequency and receives the clock synchronization frame sent by the gateway. Otherwise, the detection node starts the timer T2 and goes to sleep. When the detection node receives the clock synchronization frame sent by the gateway, it sets its clock register to the synchronization frame time to achieve clock synchronization of all nodes in the network.

7. The distributed turnout close contact detection method according to claim 1 is characterized in that: The method for detecting the node to send continuous collection data in step 4 is: When a node sends continuous acquisition data, it first sends a FILE_UP_REQ frame to notify the gateway of the data volume and waits for a reply; If the FILE_UP_ACK frame is not received from the gateway, the FILE_UP_REQ frame will be resent, and the FILE_UP frame will be sent again until the corresponding FILE_UP_ACK frame is received from the gateway, and then the stored data will be uploaded in sequence. After the node sends all the data, it sends a FILE_UP_DONE frame to notify the gateway that all data sending is completed; The gateway parses all received data and asks the node to resend the lost data frames; The node repeatedly sends the data frame with the corresponding number; Repeat the above process until the gateway receives all the continuous collected data.

8. The distributed turnout close contact detection method according to claim 1, characterized in that: The method for detecting the node sending single acquisition data in step 4 is: The detection node directly uploads a single acquisition sensor data frame DATA_UP, including the node address code, time and sensor data.

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