A system and method for monitoring the state of main driving wheels of escalator

Abstract

The present invention discloses a state monitoring system for the main drive wheel of an escalator, including a clamping electromagnetic monitoring device, an angle positioning device and a data acquisition and processing module. The clamping electromagnetic monitoring device includes a clamping bracket and three electromagnetic modules; the electromagnetic module includes an E-type magnetic core, an excitation coil and two induction coils. The magnetic lines of force emitted by the excitation coil pass through the main drive wheel and then pass through the induction coils on both sides to form a closed loop, forming a detection area; the data acquisition and processing module is respectively connected to the induction coils of each electromagnetic module to detect the defects of the main drive wheel through the magnetic flux conditions; the angle positioning device is installed on the rotating shaft of the main drive wheel to realize the positioning of the main drive wheel through the rotation of the main drive wheel. The present invention detects the magnetic flux changes of the main drive wheel through three groups of electromagnetic modules, judges and locates defects, provides reliable data support for the timely maintenance of the escalator, and ensures the safe operation of the escalator.

Description

Technical Field

[0001] The present invention belongs to the technical field of escalator monitoring, and more specifically, relates to a system and method for monitoring the state of a main driving wheel of an escalator. Background Art

[0002] As a special equipment, escalators are responsible for the important task of transporting passengers in railway and urban rail transit, and their safety is of vital importance. In order to ensure the safety of passengers and reduce the probability of accidents, escalators need to be regularly inspected and maintained to ensure that the equipment is in good operating condition. However, the current maintenance of escalators mainly adopts manual periodic maintenance and fault repair, that is, periodic inspections are carried out by staff when there is no fault, and maintenance is carried out when a fault occurs. This method is a post-event behavior and cannot effectively prevent the occurrence of faults, which is not conducive to avoiding major accidents; at the same time, periodic maintenance may cause excessive maintenance or untimely maintenance, resulting in a lot of time, manpower, and material resources, poor results, and high difficulty and cost of operation.

[0003] The main drive wheel of the escalator is a component that transmits power for the escalator. It is a key component of the escalator and is crucial to the safe operation of the escalator. There are many gear teeth distributed on the main drive wheel of the escalator. When defects occur inside, it is difficult to detect them manually, so hidden dangers will be left, affecting the operation of the escalator and threatening the life and property safety of passengers. Magnetic field detection, as a non-destructive detection method, can be applied to the state monitoring of the main drive wheel of the escalator. At present, there are patents related to magnetic field monitoring technology in the public, such as CN201910811217.3 Electromagnetic sensor and monitoring method for monitoring the state of the traction steel belt of the escalator. The patent discloses a method for detecting the state of the main drive wheel belt by an electromagnetic sensor, but the patent describes an open-loop magnetic flux sensor, the detection accuracy is low, and only one side of the main drive wheel belt can be detected. The detection range does not achieve full radial coverage of the main drive wheel belt, and the main drive wheel belt defects cannot be located in the radial detection area. The patent sensor has only one set of electromagnet modules. Once the module fails, it cannot work normally, and the reliability of the sensor is low. Patent CN201910170006.6 discloses a clamp-type magnetic flux sensor and its use method, which detects the tension of an exposed steel cable in an existing structure through a clamp-type magnetic flux sensor. The patent can only detect the internal tension of a steel cable and cannot locate the position of the detection point. The patent sensor only has one set of electromagnet modules. Once a module fails, it cannot work normally, and the reliability of the sensor is low.

[0004] In summary, the existing escalator monitoring has the following deficiencies: (1) One electromagnetic sensor only monitors one object, and the detection capability and range are small; (2) The open-loop sensor has low measurement accuracy, and the closed-loop sensor itself cannot be disassembled for maintenance, which is inconvenient; (3) The E-type electromagnetic sensor structure can only detect one side of the main drive wheel, and cannot achieve full coverage of the object to be detected; (4) The positioning measures for the defects at the detection point are insufficient, and the exact position of the defect cannot be accurately located. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a system and method for monitoring the status of the main driving wheel of an escalator, which monitors the main driving wheel of the escalator and collects status data for fault analysis, positioning and prediction, provides reliable data support for the timely maintenance of the escalator, provides effective technical means to ensure the safe operation of the escalator, and can accurately locate the defect position, achieve high reliability of online real-time monitoring, high detection accuracy, and convenient installation and maintenance.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an escalator main drive wheel state monitoring system, characterized in that it includes a clamping electromagnetic monitoring device, an angle positioning device and a data acquisition and processing module, wherein:

[0007] The clamping type electromagnetic monitoring device comprises a clamping bracket and three electromagnetic modules mounted on the clamping bracket, wherein the clamping bracket has a notch as a rotation channel for the main driving wheel;

[0008] For each of the electromagnetic modules, each includes an E-shaped magnetic core, an excitation coil and two induction coils. The E-shaped magnetic core includes a yoke and three pole arms extending from the yoke toward the notch. The three pole arms are two side pole arms and an intermediate pole arm located between the two side pole arms. The excitation coil is installed on the intermediate pole arm, and an induction coil is installed on each side pole arm. The magnetic lines of force emitted by the excitation coil pass through the main drive wheel and then pass through the induction coils on both sides to form a closed loop, thereby forming a detection area to detect the magnetic flux; wherein the cross-sectional shape of the E-shaped magnetic core cut by a plane along the radial direction of the main drive wheel is E-shaped;

[0009] The three electromagnetic modules are sequentially arranged on three sides of a rectangle, the yokes of the electromagnetic modules on two opposite sides of the rectangle are respectively parallel to the side surfaces of the main driving wheel, and the yokes of the electromagnetic modules on the other side are parallel to the center line of the main driving wheel;

[0010] The data acquisition and processing module is respectively connected to the induction coils of the electromagnetic modules to detect defects of the main driving wheel through the magnetic flux conditions measured by the electromagnetic modules;

[0011] The angle positioning device is installed on the rotating shaft of the main driving wheel to realize the positioning of the main driving wheel through the rotation of the main driving wheel.

[0012] Preferably, the angle positioning device is an encoder, a gyroscope or an angle sensor.

[0013] Preferably, the data acquisition and processing module includes a field acquisition device and a remote monitoring terminal that can communicate with the field acquisition device, the field acquisition device is respectively connected to the induction coil of each electromagnetic module through an integrated signal line, the remote monitoring terminal processes the magnetic flux collected by the clamping electromagnetic monitoring device, and groups them according to the detection areas of different electromagnetic modules to obtain a cross-sectional point cloud map formed by the magnetic flux detection data of the cross section of the main drive wheel, and judges the state of the main drive wheel in the corresponding detection area through abnormal cross-sectional point cloud map analysis, and locates the detection area where the defect is located in the cross section of the main drive wheel, thereby obtaining the position information of the defect on the cross section of the main drive wheel, and the remote monitoring terminal can also obtain the position information of the defect in the circumferential direction of the main drive wheel according to the feedback of the angle positioning device.

[0014] Preferably, the clamping type electromagnetic monitoring device further comprises a fixing bracket arranged on the clamping bracket, the fixing bracket is installed on the truss of the escalator, and the clamping type electromagnetic monitoring device is arranged on the edge of the main driving wheel.

[0015] Preferably, a plurality of the clamping-type electromagnetic monitoring devices are provided, and they are arranged along the circumference of the main driving wheel.

[0016] Preferably, a mounting boss is provided on the E-shaped magnetic core to facilitate mounting the E-shaped magnetic core on a clamping bracket.

[0017] According to another aspect of the present invention, a monitoring method using the escalator main drive wheel state monitoring system is also provided, characterized in that it includes the following steps:

[0018] (1) Each electromagnetic module of the clamping electromagnetic monitoring device collects magnetic flux in the corresponding detection area respectively, and the angle positioning device collects position information of the detection point of the main driving wheel along the circumference of the main driving wheel as the main driving wheel moves;

[0019] (2) A field collection device that collects magnetic flux and position information of the detection point of the main drive wheel along the circumference of the main drive wheel and uploads it to the data collection and processing module through an integrated signal line;

[0020] (3) The on-site acquisition device transmits all the received magnetic flux of the main driving wheel of an escalator and the position information of the detection point of the main driving wheel along the circumference of the main driving wheel to the remote monitoring terminal of the data acquisition and processing module;

[0021] (4) The remote monitoring terminal groups the magnetic flux collected by the clamp-type electromagnetic monitoring device according to the detection areas of different electromagnetic modules, and obtains a cross-sectional point cloud diagram formed by the magnetic flux detection data of the cross section of the main driving wheel;

[0022] (5) Cross-sectional point cloud diagram of abnormal screening by remote monitoring terminal;

[0023] (6) The remote monitoring terminal analyzes the abnormal cross-sectional point cloud map. First, the magnetic flux collected by the two induction coils of the same electromagnetic module is compared, and then the magnetic flux detected by different electromagnetic modules is compared to analyze and determine the status of the detection point of the main drive wheel, as follows:

[0024] The remote monitoring terminal compares and determines that if the magnetic flux collected by the two induction coils of the same electromagnetic module is inconsistent, the detection point of the main drive wheel is determined to be defective;

[0025] The remote monitoring terminal determines the severity of the defect at the detection point of the main drive wheel by comparing the difference in magnetic flux detected by different electromagnetic modules;

[0026] (7) The remote monitoring terminal generates the analysis results of the inspection points of the main drive wheel and adds the inspection area information of the section where the problematic main drive wheel part is located and the position information along the circumference of the main drive wheel, thereby locating the position of the defect on the section of the main drive wheel and along the circumference of the main drive wheel.

[0027] Preferably, in step (5), the remote monitoring terminal merges and saves the abnormal cross-sectional point cloud image and its corresponding position information along the circumference of the main drive wheel, and does not merge the normal cross-sectional point cloud image and its position information along the circumference of the main drive wheel. They are compressed and saved separately and automatically deleted after a period of time.

[0028] Preferably, the method further includes: (8) the remote monitoring terminal issues an early warning for the main driving wheel status obtained through analysis, and divides the status into multiple levels according to the severity of the bad status, and uses different methods to issue early warnings for different levels.

[0029] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0030] 1) The present invention proposes a main drive wheel status monitoring system for an escalator. The monitoring system utilizes the magnetoelastic effect to detect the change in magnetic flux of the main drive wheel according to three detection areas through three groups of electromagnetic modules of a clamping electromagnetic detection device, judge the defect of the main drive wheel by the change in magnetic flux, and locate the detection area in the cross section of the main drive wheel where the defect is located, and record the radial position of the detection point of the main drive wheel in the main drive wheel through an angle positioning device. The position of the defect on the main drive wheel can be accurately located by combining the detection area positioning and the angle positioning, thereby realizing the accurate positioning of the defect in the cross section and circumference of the main drive wheel, providing reliable data support for the timely maintenance of the escalator and ensuring the safe operation of the escalator.

[0031] 2) The present invention provides an escalator main drive wheel status monitoring system, in which multiple clamping electromagnetic modules are combined into a clamping sensor device, which has high reliability, high detection accuracy, and accurate defect positioning. It can monitor different positions of the main drive wheel at the same time, has high detection efficiency, and the monitoring device is easy to install and maintain. It can realize effective monitoring of the status of the escalator main drive wheel, and has good application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of an escalator main driving wheel state monitoring system of the present invention when monitoring the main driving wheel;

[0033] Figure 2 It is a cross-sectional schematic diagram of an escalator main driving wheel status monitoring system of the present invention during monitoring;

[0034] Figure 3 It is a schematic diagram of an explosion during monitoring of a main driving wheel state monitoring system of an escalator according to the present invention;

[0035] Figure 4 It is a structural schematic diagram of one of the electromagnetic modules in the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Reference Figure 1 to Figure 4 , a state monitoring system for the main driving wheel 4 of an escalator, comprising a clamping electromagnetic monitoring device 1, an angle positioning device 2 and a data acquisition and processing module, wherein:

[0038] The clamping electromagnetic monitoring device 1 includes a clamping bracket 104 and three electromagnetic modules installed on the clamping bracket 104. The clamping bracket 104 has a slot serving as a rotation channel for the main drive wheel 4. The main drive wheel 4 can pass through the slot, leaving a gap between the clamping electromagnetic monitoring device 1, and the two are non-contacting, which does not affect the movement of the main drive wheel 4, thereby realizing monitoring of different radial positions of the main drive wheel 4.

[0039] For each of the electromagnetic modules, each includes an E-type magnetic core 11, an excitation coil 12 and two induction coils 13. The E-type magnetic core 11 includes a yoke 111 and three pole arms extending from the yoke 111 toward the direction of the slot. The three pole arms are two side pole arms 113 and an intermediate pole arm 112 located between the two side pole arms 113. The excitation coil 12 is installed on the intermediate pole arm 112, and each side pole arm 113 is respectively installed with an induction coil 13. The magnetic lines of force emitted by the excitation coil 12 pass through the main drive wheel 4 and then pass through the induction coils 13 on both sides to form a closed loop, thereby forming a detection area to detect the magnetic flux; wherein the cross-sectional shape of the E-type magnetic core 11 cut along the radial plane of the main drive wheel 4 is E-shaped; preferably, a mounting boss 14 can be provided on the E-type magnetic core 11 to facilitate mounting the E-type magnetic core 11 on the clamping bracket 104.

[0040] Since the closed loop of each electromagnetic module forms a detection area respectively, the three electromagnetic modules can form three detection areas, and the three detection areas can cover the detection point of the main drive wheel 4. Among them, the detection point of the main drive wheel 4 is the part on the main drive wheel 4 detected by the clamping electromagnetic monitoring device 1.

[0041] Reference Figure 2 , the three electromagnetic modules are arranged in sequence on the three sides of a rectangle; the three electromagnetic modules are the first electromagnetic module 101, the second electromagnetic module 102 and the third electromagnetic module 103, which are installed in the card slot of the clamping bracket 104 through the fixing buckle 105. The clamping bracket 104 is a U-shaped frame to facilitate the installation of the three electromagnetic modules. The yoke 111 of the electromagnetic modules (the second electromagnetic module 102 and the third electromagnetic module 103) on two opposite sides of the rectangle are respectively parallel to the side surfaces of the main drive wheel 4. By adjusting the size of these two electromagnetic modules, the size of the main drive wheel 4 can be adapted; the yoke 111 of the electromagnetic module (the first electromagnetic module 101) on the other side is parallel to the center line of the main drive wheel 4;

[0042] The data acquisition and processing module is connected to the induction coils 13 of the electromagnetic modules respectively, so as to analyze the force of the step chain and detect defects of the main driving wheel 4 through the magnetic flux conditions measured by the electromagnetic modules;

[0043] The angle positioning device 2 is installed on the rotating shaft of the main drive wheel 4 to realize the positioning of the main drive wheel 4 through the rotation of the main drive wheel 4, so that the position of the detection point corresponding to the clamping electromagnetic monitoring device 1 along the circumference of the main drive wheel 4 can be known. The angle positioning device 2 always records the rotation angle of the main drive wheel 4, and the collected angle data is used to locate the circumferential position of the detection point on the main drive wheel 4 to realize the circumferential positioning of the defect. Preferably, the angle positioning device 2 is an encoder, a gyroscope or an angle sensor.

[0044] Furthermore, the data acquisition and processing module includes a field acquisition device and a remote monitoring terminal that can communicate with the field acquisition device. The field acquisition device is connected to the induction coil 13 of each electromagnetic module through an integrated signal line 3. The remote monitoring terminal processes the magnetic flux collected by the clamping electromagnetic monitoring device 1, groups them according to the detection areas of different electromagnetic modules, and obtains a cross-sectional point cloud map formed by the magnetic flux detection data of the cross section of the main drive wheel 4. The state of the main drive wheel 4 in the corresponding detection area is determined by analyzing the abnormal cross-sectional point cloud map, and the detection area where the defect is located in the cross section of the main drive wheel 4 is located, thereby obtaining the position information of the defect on the cross section of the main drive wheel 4. The remote monitoring terminal can also obtain the position information of the defect in the circumferential direction of the main drive wheel 4 according to the feedback of the angle positioning device 2, thereby realizing the precise positioning of the defect, providing reliable data support for the timely maintenance of the escalator, and ensuring the safe operation of the escalator.

[0045] The electromagnetic module of the clamp-type electromagnetic monitoring device 1 adopts a universal modular design and is connected to a standardized integrated signal line 3. The integrated signal line 3 is connected to the on-site acquisition device through a standardized connector. When the electromagnetic module fails, the signal line connector is directly unplugged for overall replacement. The on-site acquisition device receives the magnetic field data of all main drive wheels 4 of an escalator, performs preliminary processing, and then transmits it to the remote monitoring terminal via a wireless network such as 5G or a wired method.

[0046] Furthermore, the clamping electromagnetic monitoring device 1 also includes a fixing bracket 6 arranged on the clamping bracket 104 , the fixing bracket 6 is installed on the truss of the truss room 5 of the escalator, and the clamping electromagnetic monitoring device 1 is arranged on the edge of the main driving wheel 4 .

[0047] Further, refer to Figure 2 The clamping electromagnetic monitoring device 1 is provided with a plurality of devices, and they are arranged along the circumference of the main driving wheel. They are monitored separately, and then compared with each other, so as to improve the accuracy of monitoring.

[0048] According to another aspect of the present invention, a monitoring method using the escalator main drive wheel 4 state monitoring system is also provided, comprising the following steps:

[0049] (1) Each electromagnetic module of the clamping electromagnetic monitoring device 1 collects magnetic flux in the corresponding detection area, and the angle positioning device 2 collects the position information of the detection point of the main driving wheel 4 along the circumference of the main driving wheel 4 as the main driving wheel 4 moves;

[0050] (2) collecting magnetic flux and position information of the detection point of the main driving wheel 4 along the circumference of the main driving wheel 4 and uploading it to the field collection device of the data collection and processing module through the integrated signal line 3;

[0051] (3) The on-site acquisition device transmits all the received magnetic flux of the main driving wheel 4 of an escalator and the position information of the detection point of the main driving wheel 4 along the circumference of the main driving wheel 4 to the remote monitoring terminal of the data acquisition and processing module;

[0052] (4) The remote monitoring terminal groups the magnetic flux collected by the clamping electromagnetic monitoring device 1 according to the detection areas of different electromagnetic modules, and obtains a cross-sectional point cloud map formed by the magnetic flux detection data of the cross section of the main driving wheel 4; a cross-sectional point cloud map is formed by the magnetic flux detection data of three detection areas at the same part of the main driving wheel 4, and there are many cross-sectional point cloud maps along the moving direction of the step chain 4;

[0053] (5) The remote monitoring terminal selects abnormal cross-sectional point cloud images; wherein the remote monitoring terminal combines and saves the abnormal cross-sectional point cloud images and their corresponding position information along the circumference of the main driving wheel 4, and does not combine the normal cross-sectional point cloud images and their position information along the circumference of the main driving wheel 4, but compresses and saves them separately, and automatically deletes them after a period of time;

[0054] (6) The remote monitoring terminal analyzes the abnormal cross-sectional point cloud diagram, firstly comparing the magnetic flux collected by the two induction coils 13 of the same electromagnetic module, and then comparing the magnetic flux detected by different electromagnetic modules, to analyze and determine the state of the detection point of the main driving wheel 4, as follows:

[0055] The remote monitoring terminal compares and finds that if the magnetic fluxes collected by the two induction coils 13 of the same electromagnetic module are inconsistent, it is determined that the detection point of the main drive wheel 4 has a defect, and it can be obtained that the detection point of the main drive wheel 4 detected in the detection area formed by the electromagnetic module has a defect;

[0056] The remote monitoring terminal determines the severity of the defect at the detection point of the main driving wheel 4 by comparing the difference in magnetic flux detected by different electromagnetic modules;

[0057] (7) The remote monitoring terminal generates the analysis results of the detection points of the main drive wheel 4 and adds the detection area information of the section where the problematic part of the main drive wheel 4 is located and the position information along the circumference of the main drive wheel 4, and locates the position of the defect on the section of the main drive wheel 4 and along the circumference of the main drive wheel 4;

[0058] (8) The remote monitoring terminal issues an early warning for the state of the main driving wheel 4 obtained through analysis, and divides the state into multiple levels according to the severity of the bad state, and uses different methods to issue early warnings for different levels.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An escalator main drive wheel status monitoring system, characterized in that: It includes a clamping electromagnetic monitoring device, an angle positioning device and a data acquisition and processing module, wherein: The clamping type electromagnetic monitoring device comprises a clamping bracket and three electromagnetic modules mounted on the clamping bracket, wherein the clamping bracket has a notch as a rotation channel for the main driving wheel; For each of the electromagnetic modules, each includes an E-shaped magnetic core, an excitation coil and two induction coils. The E-shaped magnetic core includes a yoke and three pole arms extending from the yoke toward the notch. The three pole arms are two side pole arms and an intermediate pole arm located between the two side pole arms. The excitation coil is installed on the intermediate pole arm, and an induction coil is installed on each side pole arm. The magnetic lines of force emitted by the excitation coil pass through the main drive wheel and then pass through the induction coils on both sides to form a closed loop, thereby forming a detection area to detect the magnetic flux; wherein the cross-sectional shape of the E-shaped magnetic core cut by a plane along the radial direction of the main drive wheel is E-shaped; The three electromagnetic modules are sequentially arranged on three sides of a rectangle, the yokes of the electromagnetic modules on two opposite sides of the rectangle are respectively parallel to the side surfaces of the main driving wheel, and the yokes of the electromagnetic modules on the other side are parallel to the center line of the main driving wheel; The data acquisition and processing module is respectively connected to the induction coils of the electromagnetic modules to detect defects of the main driving wheel through the magnetic flux conditions measured by the electromagnetic modules; The data acquisition and processing module includes a field acquisition device and a remote monitoring terminal that can communicate with the field acquisition device. The field acquisition device is connected to the induction coil of each electromagnetic module through an integrated signal line. The remote monitoring terminal processes the magnetic flux collected by the clamping electromagnetic monitoring device, groups the detection areas of different electromagnetic modules, and obtains a cross-sectional point cloud map formed by the magnetic flux detection data of the cross section of the main drive wheel. The state of the main drive wheel in the corresponding detection area is determined by analyzing the abnormal cross-sectional point cloud map, and the detection area where the defect is located in the cross section of the main drive wheel is located, so as to obtain the position information of the defect on the cross section of the main drive wheel. The remote monitoring terminal can also obtain the position information of the defect in the circumferential direction of the main drive wheel according to the feedback of the angle positioning device; The angle positioning device is installed on the rotating shaft of the main driving wheel to realize the positioning of the main driving wheel through the rotation of the main driving wheel.

2. The escalator main driving wheel state monitoring system according to claim 1 is characterized in that: The angle positioning device is an encoder, a gyroscope or an angle sensor.

3. The escalator main driving wheel state monitoring system according to claim 1, characterized in that: The clamping type electromagnetic monitoring device also includes a fixing bracket arranged on the clamping bracket, the fixing bracket is installed on the truss of the escalator, and the clamping type electromagnetic monitoring device is arranged on the edge of the main driving wheel.

4. The escalator main driving wheel state monitoring system according to claim 1, characterized in that: A plurality of the clamping-type electromagnetic monitoring devices are provided, and they are arranged along the circumference of the main driving wheel.

5. The escalator main driving wheel state monitoring system according to claim 1, characterized in that: The E-shaped magnetic core is provided with a mounting boss to facilitate mounting the E-shaped magnetic core on a clamping bracket.

6. A monitoring method for the escalator main driving wheel status monitoring system according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Each electromagnetic module of the clamping electromagnetic monitoring device collects magnetic flux in the corresponding detection area respectively, and the angle positioning device collects position information of the detection point of the main driving wheel along the circumference of the main driving wheel as the main driving wheel moves; (2) A field collection device that collects magnetic flux and position information of the detection point of the main drive wheel along the circumference of the main drive wheel and uploads it to the data collection and processing module through an integrated signal line; (3) The on-site acquisition device transmits all the received magnetic flux of the main driving wheel of an escalator and the position information of the detection point of the main driving wheel along the circumference of the main driving wheel to the remote monitoring terminal of the data acquisition and processing module; (4) The remote monitoring terminal groups the magnetic flux collected by the clamp-type electromagnetic monitoring device according to the detection areas of different electromagnetic modules, and obtains a cross-sectional point cloud diagram formed by the magnetic flux detection data of the cross section of the main driving wheel; (5) Cross-sectional point cloud diagram of abnormal screening by remote monitoring terminal; (6) The remote monitoring terminal analyzes the abnormal cross-sectional point cloud map. First, the magnetic flux collected by the two induction coils of the same electromagnetic module is compared, and then the magnetic flux detected by different electromagnetic modules is compared to analyze and determine the status of the detection point of the main drive wheel, as follows: The remote monitoring terminal compares and determines that if the magnetic flux collected by the two induction coils of the same electromagnetic module is inconsistent, the detection point of the main drive wheel is determined to be defective; The remote monitoring terminal determines the severity of the defect at the detection point of the main drive wheel by comparing the difference in magnetic flux detected by different electromagnetic modules; (7) The remote monitoring terminal generates the analysis results of the inspection points of the main drive wheel and adds the inspection area information of the section where the problematic main drive wheel part is located and the position information along the circumference of the main drive wheel, thereby locating the position of the defect on the section of the main drive wheel and along the circumference of the main drive wheel.

7. The monitoring method according to claim 6, characterized in that: In step (5), the remote monitoring terminal merges and saves the abnormal cross-sectional point cloud image and its corresponding position information along the circumference of the main drive wheel, and does not merge the normal cross-sectional point cloud image and its position information along the circumference of the main drive wheel. They are compressed and saved separately and automatically deleted after a period of time.

8. The monitoring method according to claim 6, characterized in that: Also includes: (8) The remote monitoring terminal issues an early warning for the main drive wheel status obtained through analysis, and divides the status into multiple levels according to the severity of the bad status, and uses different methods to issue early warnings at different levels.

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