Online detection device and method based on PLC and having no influence on train operation

Abstract

The invention relates to the technical field of rail transit automatic monitoring, in particular to a PLC-based on-line detection device and method without affecting train operation, and a main body assembly, the device comprises an accommodating part, an accommodating part and a detection part, the accommodating part is arranged on the accommodating part, and the detection part is arranged on the accommodating part; the control assembly comprises a fixing plate, a spring and a telescopic plate, the fixing plate is arranged on the containing piece, the spring is arranged on the fixing plate, and the telescopic plate is arranged on the spring; the fixing assembly comprises a measuring part, a machine snakelike rail holding support and a control console, the measuring part, the machine snakelike rail holding support and the control console are arranged on the containing part, advancing and stopping of the device are conducted through a PLC, and in the running process of the device, images of a rail are collected through a rotatable camera and transmitted to a control center; and the control center performs control operation through a PLC, monitors the position of the device in real time through a Beidou locator, and inspects the track in combination with the real-time position and image information.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic monitoring of rail transit, and in particular to an online detection device and method based on PLC that does not affect train operation. Background Art

[0002] With the rapid development of my country's economy, the construction industry of rail transportation has developed more and more rapidly. As a basic component, the track carries the operation of high-speed rail and directly affects the safety of train travel. If the track environment is unsafe, it will seriously affect the operation and even cause the loss of manpower and material resources. Therefore, monitoring the track is a vital link in the railway transportation system. In addition, with the development of the current Internet of Things, intelligent technology has been improved, and it has been applied to track detection. Designing a method to monitor and evaluate the status of railway tracks in real time by using advanced technical means to help railway companies discover potential faults and problems in advance is crucial to reducing operational risks and improving the safety of train operation.

[0003] In the prior art, track inspection is generally done by manual inspection and railway track inspection vehicles. Among them, manual inspection is the main method of track inspection. Staff will regularly patrol the tracks to look for any abnormalities, such as cracks, breakage or offset. However, this method is very time-consuming and prone to missing subtle problems. Although the emergence of track inspection vehicles has solved the problems of low efficiency and poor results, it is expensive and still relies on manual operation for semi-automation. The purchase, operation and maintenance of track monitoring vehicles requires a lot of funds and human resources. In addition, the application of track inspection vehicles also needs to consider the external transportation of railways. Due to the limitations of railway operations, efficient inspections cannot be carried out on the tracks at any time. Summary of the invention

[0004] In view of the above existing railway operation conditions and the need to rely on manual semi-automatic operation, there are still problems such as being limited by normal train operation conditions and low efficiency during inspection, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide an online detection device based on PLC that does not affect the operation of the train.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an online detection device based on PLC that does not affect the operation of the train, comprising:

[0007] The main body assembly comprises a receiving member, a receiving member and a detecting member, wherein the receiving member is arranged on the receiving member, and the detecting member is arranged on the receiving member;

[0008] A control assembly, comprising a fixed plate, a spring and a telescopic plate, wherein the fixed plate is arranged on the accommodating member, the spring is arranged on the fixed plate, and the telescopic plate is arranged on the spring; and,

[0009] The fixing assembly comprises a measuring piece, a machine serpentine rail-holding bracket and a control console, wherein the measuring piece, the machine serpentine rail-holding bracket and the control console are arranged on the accommodating piece.

[0010] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the accommodating part includes a power wheel and a platform arranged on the power wheel.

[0011] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the accommodating member includes a groove opened on the platform, and a folding motor is arranged on the groove.

[0012] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the detection component includes a camera bracket set on the setting platform, and a rotatable camera is set on the camera bracket.

[0013] As a preferred solution of the online detection device based on PLC that does not affect the operation of the train of the present invention, wherein: a spring is fixedly connected to one side of the fixed plate, and a telescopic plate is fixedly connected to one side of the spring. The telescopic plate is connected to the spring so that when the device is placed, the fixed plate is first contacted with the waist of the track on one side, and then the telescopic plate is compressed, and the device is placed on the track. Through the action of the spring, the telescopic plate is stuck on the track on the other side.

[0014] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the measuring component includes a monitoring camera arranged on one side of the platform and a laser rangefinder arranged on the other side.

[0015] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the machine serpentine rail-holding bracket is arranged on the lower side of the platform, and a rail-holding drive is provided in the machine serpentine rail-holding bracket.

[0016] As a preferred solution of the present invention, an online detection device based on PLC that does not affect the operation of the train, wherein: the console is fixedly connected to the upper side of the platform, a circuit connection is provided in the console, and a voltage stabilizing chip and a protective resistor are provided in the circuit.

[0017] A PLC-based online detection method that does not affect train operation includes the above-mentioned PLC-based online detection device that does not affect train operation, and includes the following steps:

[0018] First, the device is mounted on the track through the machine serpentine rail-holding bracket;

[0019] The images of the track are collected by the equipment in the device and transmitted to the control center;

[0020] The control center then controls the operation through PLC, monitors the position of the device in real time through Beidou locator 301d, and inspects the track in combination with real-time position and image information.

[0021] As a preferred solution of the present invention, an online detection device and method based on PLC that does not affect the operation of the train, the control center of the console includes controlling a rotatable camera, a monitoring camera, a laser rangefinder, a folding motor, and a machine serpentine track-holding bracket, all of which are controlled by a programmable logic controller PLC.

[0022] Beneficial effects of the present invention: (1) This solution allows the fixed plate to contact the track on one side first, and then compresses the telescopic plate. Through the action of the internal spring, the telescopic plate can be stuck on the track on the other side, and a permanent magnet is installed in the power wheel to be used for adsorption with the waist of the track. With double protection, the device can be placed safely and stably on the track, and the device can be easily placed at any place on the track for disassembly and assembly.

[0023] (2) During the operation of the device, the monitoring camera transmits the signal of the oncoming vehicle to the control center, and the laser scanning makes the device stop between the two fasteners. The control center controls the folding motor to adjust the joint of the camera bracket through the PLC to fold the rotatable camera to the middle, and controls the track-holding drive to extend the folded mechanical serpentine track-holding bracket to hold the track on both sides. When the train passes through the track, the above-mentioned folding operation of the device will not affect the normal operation of the train, and the track-holding operation can make the device stably fixed on the track, and the device will not fall due to the vibration generated by the train operation. Compared with conventional on-track inspection vehicles, which need to consider the train running schedule to run inspections, this indirectly improves the transportation efficiency of the railway.

[0024] (3) This solution uses PLC to advance and stop the device. During the operation of the device, the rotatable camera collects images of the track and transmits them to the control center. The control center then controls the operation through PLC and monitors the position of the device in real time through the Beidou locator. The track is inspected by combining the real-time position and image information. Compared with conventional manual inspections, this device saves manpower and material resources and is more practical. At the same time, compared with track inspection vehicles, the fully automated device avoids manual participation in the inspection process, which not only saves costs, but also avoids the interference of errors caused by manual inspections. It also has a higher efficiency in track inspections and improves the accuracy of inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The present invention is a schematic structural diagram of an online detection device based on PLC that does not affect train operation under normal working conditions.

[0027] Figure 2 This is a schematic structural diagram of a PLC-based online detection device in a folded state that does not affect train operation according to the present invention.

[0028] Figure 3 The figure is a side structural schematic diagram of an online detection device based on PLC which does not affect the operation of trains according to the present invention.

[0029] Figure 4 The present invention is a schematic diagram of a control component of an online detection device based on PLC that does not affect train operation.

[0030] Figure 5 This is a schematic diagram of the structure of a machine serpentine rail-holding bracket of an online detection device based on PLC that does not affect train operation in the present invention.

[0031] Figure 6 The present invention is a schematic diagram of a controller information loop of an online detection device and method based on PLC that does not affect train operation.

[0032] Figure 7 The present invention is a schematic diagram of an instrument status control loop of an online detection device and method based on PLC that does not affect train operation.

[0033] Figure 8 The present invention is a schematic diagram of an instrument data acquisition and processing circuit for an online detection device and method based on PLC that does not affect train operation. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0038] Example 1

[0039] Reference Figure 1 - Figure 3 , which is the first embodiment of the present invention, provides an online detection device based on PLC that does not affect the operation of a train. The device includes a main assembly 100, including a receiving member 101, a receiving member 102 and a detection member 103. The receiving member 102 is arranged on the receiving member 101, and the detection member 103 is arranged on the receiving member 101;

[0040] The control assembly 200 includes a fixed plate 201 , a spring 202 and a telescopic plate 203 . The fixed plate 201 is disposed on the receiving component 101 , the spring 202 is disposed on the fixed plate 201 , and the telescopic plate 203 is disposed on the spring 202 .

[0041] Specifically, the accommodating component 101 includes a power wheel 101a and a platform 101b arranged on the power wheel 101a. The power wheel 101a is close to the waist of the rail and is connected with a power motor. The left and right sides of the platform 101b are fixedly connected with the power wheel 101a. The power wheel 101a contains a permanent magnet that can be used to adsorb to the waist of the rail. The outer wheel surface is made of rubber material, and the side of the power wheel 101a is adsorbed on the side of the rail.

[0042] Furthermore, the container 102 includes a groove 102a opened on the platform 101b, and a folding motor 102b is arranged on the groove 102a. A groove 102a is opened on both sides of the upper side of the platform 101b, and the groove 102a can allow an object to be placed thereon. The folding motor 102b is movably connected in the groove 102a. The folding motor 102b allows the object placed in the groove 102a to be partially placed in the groove 102a when it is contracted, and can drive the device to rise and fall.

[0043] Furthermore, the detection component 103 includes a camera bracket 103a set on the platform 101b, a rotatable camera 103b set on the camera bracket 103a, the camera bracket 103a is fixed on the platform 101b, the rotatable camera 103b is installed on the top of the camera bracket 103a, the rotatable camera 103b can rotate to monitor the track and the bottom of the bogie, and the rotatable camera 103b is used to detect the state of the track and the external environment, etc.

[0044] Furthermore, a spring 202 is fixedly connected to one side of the fixed plate 201, and a telescopic plate 203 is fixedly connected to one side of the spring 202. The telescopic plate 203 is connected to the spring 202 through the telescopic plate 203. Through the interaction between them, when the device is placed, the fixed plate 201 is first brought into contact with the waist of the track on one side, and then the telescopic plate 203 is compressed, and the device is placed on the track. Through the action of the spring 202, the telescopic plate 203 is stuck on the track on the other side, so that the device can be placed and disassembled more conveniently. At the same time, when the spring 202 is in the state of maximum compression, the length of the instrument is greater than 1435 mm, which further ensures that the instrument will not fall off the track.

[0045] During operation, the container 101 is tightly attached to the waist of the rail through the power wheel 101a, and the built-in power motor drives the power wheels 101a on the left and right sides of the platform 101b to achieve smooth movement. The platform 101b is provided with a groove 102a and a folding motor 102b, so that when the rotatable camera 103b is retracted, part of it can be placed in the groove 102a, on the one hand to ensure the stability of the camera, on the other hand to ensure that it is lower than the bottom of the train, which is convenient for train operation. The camera bracket 103a and the rotatable camera 103b provide all-round monitoring, and the telescopic plate 203 is connected with the spring 202 to ensure that the device is stably placed on the track and is not easy to fall off. The overall design takes into account the convenience and safety of operation and is suitable for various track operation scenarios.

[0046] Example 2

[0047] Reference Figure 1 - Figure 6 , which is the first embodiment of the present invention, provides an online detection device based on PLC that does not affect the operation of the train. The device includes a fixed component 300, including a measuring part 301, a machine serpentine rail-holding bracket 302 and a control console 303. The measuring part 301, the machine serpentine rail-holding bracket 302 and the control console 303 are arranged on the accommodating part 101.

[0048] Specifically, the measuring part 301 includes a monitoring camera 301a arranged on one side of the platform 101b and a laser rangefinder 301b arranged on the other side. The monitoring camera 301a is fixed in front of the platform 101b, and the laser rangefinder 301b is installed on the bottom surface of the platform 101b. The monitoring camera 301a is used to detect the situation of incoming vehicles and determine whether the device needs to be folded or working, which greatly improves the operation and control of the device.

[0049] Furthermore, a robot snake-shaped rail-holding bracket 302 is arranged on the lower side of the platform 101b. A rail-holding drive is provided inside the robot snake-shaped rail-holding bracket 302. The robot snake-shaped rail-holding bracket 302 is a bionic robot with joints, including a snake head, a snake body and a snake tail, and also includes a connecting rod joint. It can meander in an S-shaped curve, which is convenient for holding the rails on both sides of the track. Based on the retractable and arbitrary turning characteristics of the robot snake, it can be extended downward and then extended to both sides, and finally buckled inward to the bottom of the rail, which can be well hidden under the platform 101b.

[0050] Furthermore, the console 303 is fixedly connected to the upper side of the platform 101b, and a circuit connection is provided inside the console 303, and a voltage stabilizing chip and a protective resistor are provided in the circuit.

[0051] During operation, the device is equipped with an advanced measurement system, including a monitoring camera 301a fixed in front of the platform 101b and a laser rangefinder 301b installed on the bottom of the platform 101b, for precise monitoring and measurement. The mechanical snake-shaped track-holding bracket 302 is set on the lower side of the platform 101b, with a joint bionic design, and can meander in an S-shaped curve, which is convenient for holding the track on both sides of the track. The console 303 is fixedly connected to the upper side of the platform 101b, and the internal circuit connection is stable. It is equipped with a voltage stabilizing chip and a protective resistor to ensure safe and reliable operation of the equipment. The overall design integrates multiple functions and is suitable for complex track operation environments. The platform 101b and the bracket are made of carbon fiber materials, which are light in weight, high in rigidity, and have a good shock absorption effect. It absorbs the vibration of the track during the operation of the device and reduces the transmission of power to the console 303, thereby playing a certain protective role for the circuit in the console 303.

[0052] Example 3

[0053] Reference Figure 1 - Figure 8 , which is the third embodiment of the present invention, provides an online detection device and method based on PLC that does not affect train operation, including the following contents:

[0054] Specifically, the control center provided in the console 303 is a programmable logic controller PLC, which controls the operation of each part;

[0055] The power wheel 101a is connected to a power motor, and the power motor is connected to the control center;

[0056] Among them, the mechanical serpentine rail-holding bracket 302 is connected to the control center. When controlled by the control center, it can move downward and to both sides to hold the track. It can be very small when hidden, and can be extended and elongated when working. When the monitoring camera 301a observes the train coming, it transmits a signal to the control center. The control center is controlled by the programmable logic controller PLC. On the one hand, it controls the folding motor 102b to fold the camera bracket 103a, and on the other hand, it controls the mechanical serpentine rail-holding bracket 302 to shrink and fold, so that this device does not affect the normal movement of the train on the track;

[0057] The control center includes the control of the rotatable camera 103b, the monitoring camera 301a, the laser rangefinder 301b, and the folding motor 102b, all of which are controlled by a programmable logic controller PLC;

[0058] By connecting each module with PLC, the purpose of control through PLC is achieved. When the device is running, workers do not need to be on site, which improves the efficiency of monitoring. In the controller information loop, "+" represents output and "-" represents negative feedback. The programmer can reserve programs to process the data collected by the sensor and store the data in the user program storage and transmit it back to the terminal server; in addition, the programmer can also receive terminal instructions and pass the instruction signal to the controller control device. The programmable logic controller PLC has programmability and flexibility. Different control logic and functions can be realized by writing and modifying programs. It is suitable for this application scenario, and it has the advantages of scalability, strong communication capabilities, easy maintenance and operation.

[0059] Furthermore, the folding motor 102b is connected to the console 303 and is controlled by the control center. When a train is coming in front, the rotatable camera 102b can be conveniently controlled to be folded, and when there is no train, the rotatable camera 103b can also be unfolded to work, thereby improving the various operating efficiencies and states of the equipment;

[0060] Among them, the laser rangefinder 301b is connected to the control console 303. When there is a train ahead, the control center controls the laser rangefinder 301b to work to determine whether the device stops between two fasteners, so that the machine serpentine track-holding bracket 302 can hold the track without being blocked by the fasteners.

[0061] like Figure 7 As shown, the instrument status control loop includes four sensors: a monitoring camera 301a, a vibration sensor, a laser rangefinder 301b and a Beidou locator 301d.

[0062] This solution monitors the image recognition of the camera 301a, the vibration information of the vibration sensor 301c, the distance information of the laser rangefinder 301b and the position information of the Beidou locator 301d. The processing unit processes and analyzes the data, and then evaluates the environment and positioning posture of the instrument. When a train approaches or the instrument posture deviates, the input unit receives the signal, the controller controls the actuator to respond, and the actuator and the controlled object feed back the new signal to the input end, and continuously calibrates to ensure the normal operation of the train and the instrument.

[0063] like Figure 8 As shown, the instrument data acquisition and processing circuit includes two sensors, a rotatable camera 103b and a Beidou locator 301d. The image information collected by the rotatable camera 103b is received through the programmer, and the obtained data is processed and transmitted back to the terminal server and stored in the user program storage. The terminal can also remotely control the instrument by feeding back to the controller through the programmer according to the collected image information and the position information collected by the Beidou locator 301d;

[0064] Among them, the positioning device Beidou locator 301d can monitor the position of the device in real time. When encountering problems such as diseases, it can provide feedback on the disease location in a timely manner based on the real-time position and image information. On the other hand, it can locate the position of the device in real time;

[0065] Among them, by installing a positioning device Beidou locator 301d in the platform 101b, the positioning function of the device is realized. During the operation of the device, the image of the track is collected by the rotatable camera 103b, etc., and the collected information is transmitted to the control center. The position of the device is monitored in real time through the positioning component, and the track is inspected in combination with the real-time position and image information. The position of the device is fed back at any time, without the need for manual on-site, and the position of the device can be located and obtained at any time during online detection;

[0066] Among them, the vibration sensing device is in the platform 101b. When a train comes from the front, it can sense the vibration of the rails. Combined with the camera, the device can be retracted to provide double protection. By installing the vibration sensing device, when a train comes from the front, the rails will vibrate, so that the vibration sensing device receives a signal and transmits the signal to the control center. The control center combines the camera and obtains a signal that the device needs to be retracted at this time. The control center then sends a signal to each component to make the device fold. The image information collected by the rotatable camera 103b is received through the programmer, and the obtained data is processed and transmitted back to the terminal server and stored in the user program storage. The terminal can also remotely control the instrument based on the collected image information and the position information collected by the Beidou locator 301d through the programmer.

[0067] During the operation, after adjusting the retractable platform 101b, the two power wheels 101a are stuck at the waist of the track, and the permanent magnet inside the power wheel 101a and the track are adsorbed to stably place the device on the track. The power wheel 101a is controlled by the programmable logic controller PLC in the console 303 to advance and stop the device. During the operation of the device, the rotatable camera 103b collects image data such as cracks and detachment on the track, and transmits the collected information to the control center. The control center PLC gives feedback and controls the Beidou locator 301d to locate the disease, which is convenient for real-time monitoring of the position of the device, and inspects the track in combination with the real-time position and image information; the monitoring camera 301a monitors the vehicle coming from the front. When the vehicle comes from the front, the monitoring camera 301a sends a signal to the control center, and the control center PLC controls the folding motor 102b to operate, so that the two rotatable cameras 103b are folded to the middle and placed at the waist of the track, and the control center PLC transmits a signal to the laser rangefinder 301b. Scanning is performed. When the laser is not blocked, that is, the device stops between the two fasteners, a signal is transmitted to the control center, and the control center controls the power wheel 101a to pause the device. At the same time, the control center PLC controls the track-holding drive to extend the folded machine serpentine track-holding bracket 302 downward, then to both sides, and finally buckle the bottom of the rail inward. The track-holding action makes the device stably fixed on the track, and will not cause the device to fall due to the vibration generated by the train operation, and the folding will not affect the normal operation of the train. Through this device, it is avoided that the conventional on-track inspection vehicle needs to consider the train running schedule to run the inspection, does not affect the normal operation of the train, and improves the transportation efficiency of the railway; at the same time, the fully automated device avoids manual participation in the inspection process, saves the consumption of manpower and material resources, and avoids the error interference caused by manual inspection factors, and the inspection efficiency of the track is higher, which improves the accuracy of the inspection. Finally, the machine serpentine track-holding bracket 302, the retractable platform 101b and the permanent magnet of the power wheel 101a ensure the stability and safety of the device when the train passes.

[0068] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values, mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, improvements, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0069] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0070] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, without undue experimentation, the development effort will be a routine task of design, fabrication, and production.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An online detection device based on PLC that does not affect train operation, characterized in that: include, A main body component (100) comprises a receiving component (101), a receiving component (102) and a detecting component (103), wherein the receiving component (102) is arranged on the receiving component (101), and the detecting component (103) is arranged on the receiving component (101); A control assembly (200), comprising a fixed plate (201), a spring (202) and a telescopic plate (203), wherein the fixed plate (201) is arranged on the accommodating member (101), the spring (202) is arranged on the fixed plate (201), and the telescopic plate (203) is arranged on the spring (202); and, The fixing assembly (300) comprises a measuring piece (301), a machine serpentine rail-holding bracket and a control console (303); the measuring piece (301), the machine serpentine rail-holding bracket (302) and the control console (303) are arranged on the accommodating piece (101).

2. The PLC-based online detection device that does not affect train operation according to claim 1 is characterized in that: The accommodating member (101) comprises a power wheel (101a) and a platform (101b) arranged on the power wheel (101a).

3. The PLC-based online detection device that does not affect train operation according to claim 2 is characterized in that: The receiving member (102) comprises a groove (102a) opened on the platform (101b), and a folding motor (102b) is arranged on the groove (102a).

4. The PLC-based online detection device that does not affect train operation according to claim 3 is characterized in that: The detection member (103) comprises a camera support (103a) provided on the folding motor (102b), and a rotatable camera (103b) provided on the camera support (103a).

5. The PLC-based online detection device that does not affect train operation according to claim 4 is characterized in that: A spring (202) is fixedly connected to one side of the fixed plate (201), and a telescopic plate (203) is fixedly connected to one side of the spring (202). The telescopic plate (203) is connected to the spring (202) so that when the device is placed, the fixed plate (201) is first brought into contact with the waist of a track on one side, and then the telescopic plate (203) is compressed to place the device on the track. The spring (202) causes the telescopic plate (203) to be stuck on the track on the other side.

6. The PLC-based online detection device that does not affect train operation according to claim 5 is characterized in that: The measuring device (301) comprises a monitoring camera (301a) arranged on one side of the platform (101b) and a laser rangefinder (301b) arranged on the other side.

7. The PLC-based online detection device that does not affect train operation according to claim 6 is characterized in that: The machine serpentine rail-holding bracket (302) is arranged on the lower side of the platform (101b), and a rail-holding drive is arranged inside the machine serpentine rail-holding bracket (302).

8. The PLC-based online detection device that does not affect train operation according to claim 7 is characterized in that: The console (303) is fixedly connected to the upper side of the platform (101b), and a circuit connection is provided inside the console (303), wherein a voltage stabilizing chip and a protective resistor are provided in the circuit.

9. An online detection device and method based on PLC that does not affect train operation, characterized in that: The PLC-based online detection device that does not affect train operation as claimed in any one of claims 1 to 8 comprises the following steps: First, the device is mounted on the track by means of the mechanical serpentine rail-holding bracket (302); The images of the track are collected by the equipment in the device and transmitted to the control center; The control center then controls the operation through PLC, and monitors the position of the device in real time through the Beidou locator (301d), and inspects the track in combination with the real-time position and image information.

10. The PLC-based online detection device and method that does not affect train operation according to claim 9, characterized in that: The control center of the console (303) includes a control unit for controlling a rotatable camera (103b), a monitoring camera (301a), a laser rangefinder (301b), a folding motor (102b), and a machine serpentine rail-holding bracket (302), all of which are controlled by a programmable logic controller (PLC).

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