Online monitoring device for damage of steel wire rope of portal crane

Abstract

A portal crane steel wire rope damage on-line monitoring device relates to the technical field of crane steel wire rope nondestructive testing and can accurately judge the damage condition of a steel wire rope. In the portal crane steel wire rope damage on-line monitoring device, a motor is used for driving a winding drum to rotate and driving a steel wire rope to be wound on the winding drum; the top end of the support is connected with an encoder assembling module, one side of the support is provided with a connecting hole, and a lead screw is fixedly inserted into the connecting hole. A linear motor is arranged at the lead screw, is provided with an electromagnetic ultrasonic monitoring probe, and is used for driving the electromagnetic ultrasonic monitoring probe to slide left and right on the lead screw along a straight line; the encoder assembly module is in contact with the winding drum, an electromagnetic ultrasonic monitoring probe is arranged at the winding drum, and the electromagnetic ultrasonic monitoring probe is sequentially connected with a signal filtering and amplifying module, a signal acquisition module, a wireless signal transmitting module and a remote computer monitoring system; the encoder assembling module and the linear motor are connected with the wireless signal transmitting module.

Description

Technical Field

[0001] The utility model relates to the technical field of non-destructive testing of crane steel ropes, in particular to an on-line monitoring device for damage of steel ropes of gantry cranes. Background Technique

[0002] At present, the steel rope of a crane, as a key component connecting the crane and the object to be lifted, undertakes the tasks of lifting and hanging heavy objects. Among them, the stability and reliability of the steel rope are directly related to the safety of the lifting operation. During long-term use, due to reasons such as wear, fatigue, corrosion, and deformation, the steel rope is prone to various types of damage such as broken wires, reduced rope diameter, and extrusion of rope strands, resulting in a decrease in the load-bearing capacity of the steel rope. Therefore, if the damage cannot be detected and processed in time, the steel rope will eventually break during the process of lifting goods, leading to serious safety accidents.

[0003] In the prior art, the common methods for non-destructive testing of steel ropes usually include two types: strong magnetic flux leakage testing and weak magnetic remanence testing. Among them, the strong magnetic flux leakage testing method for steel ropes has certain advantages in detecting surface and near-surface damage of steel ropes. However, the sensitivity of flux leakage testing is affected by various factors, including the magnetism of the steel rope, surface state, nature of the defect, and magnetization intensity. Therefore, in some cases, if the magnetic permeability of the defect is similar to that of the surrounding material, or the defect is very small, it is impossible to generate enough magnetic flux leakage fields for detection. At the same time, for internal defects far from the surface, since the magnetic field distortion is mainly reflected around the defect, and no obvious magnetic flux leakage field may be generated on the surface of the workpiece, it is also difficult to be detected. In addition, since the magnetic field intensity applied to the steel rope by strong magnetic flux leakage testing is very large, it cannot meet the on-line monitoring during the normal operation of the steel rope. Among them, the weak magnetic remanence testing method has high sensitivity to minor damage of the steel rope and can realize on-line monitoring of the steel rope. However, this method is easily interfered by other magnetic objects in the surrounding environment, such as nearby ferromagnetic materials and electromagnetic devices. And, under high-speed operation, if the magnetization degree of the steel rope is insufficient, the signal acquisition and analysis ability is poor, thus unable to ensure the accuracy of the detection results.

[0004] Therefore, how to provide an on-line monitoring device for damage of steel ropes of gantry cranes, which can monitor in real time the situation where the load-bearing capacity of the steel rope decreases due to internal damage caused by cracks, corrosion, fatigue, etc. under the condition that the crane is working normally, has become a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model

[0005] The purpose of the present utility model is to provide an on-line monitoring device for the damage of the steel wire rope of a gantry crane, which can accurately judge the damage condition of the steel wire rope; in addition, when the load-bearing capacity of the steel wire rope is insufficient, it can generate acoustic emission signals during the loading process, and is not limited to the detection of specific types of defects on the surface or inside of the steel wire rope.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] An on-line monitoring device for the damage of the steel wire rope of a gantry crane, comprising: a motor, and a motor control box for controlling the rotation of the motor; the motor is used to drive a drum to rotate, and drive a steel wire rope to wind around the drum, and the drum is used to drive the lifting and lowering of the goods to be hoisted;

[0008] A bracket, the top of the bracket is connected with an encoder assembly module, and one side of the bracket has a connection hole, and a lead screw is inserted and fixed in the connection hole; a linear motor is arranged at the lead screw, and the linear motor is equipped with an electromagnetic ultrasonic monitoring probe, and the linear motor is used to drive the electromagnetic ultrasonic monitoring probe to slide left and right along a straight line on the lead screw;

[0009] The encoder assembly module is in contact with the drum, the electromagnetic ultrasonic monitoring probe is arranged at the drum, the electromagnetic ultrasonic monitoring probe is connected with a signal filtering and amplifying module, the signal filtering and amplifying module is connected with a signal acquisition module, the signal acquisition module is connected with a wireless signal transmitting module, and the wireless signal transmitting module is connected with a remote computer monitoring system; and, the encoder assembly module is connected with the wireless signal transmitting module, and the linear motor is also connected with the wireless signal transmitting module.

[0010] During actual application, the on-line monitoring device for the damage of the steel wire rope of the gantry crane further comprises: a chassis, and the chassis is used to fixedly support the whole set of monitoring devices; the bottom of the chassis is connected with the metal structure of the crane through anchor bolts, and the top is connected with the feet of the motor and the bracket through fastening bolts.

[0011] Wherein, the encoder assembly module includes: a roller encoder, the roller encoder is inserted into the central hole of the support frame, and the fastening screw passes through the positioning hole of the support frame and is screwed into the positioning hole of the roller encoder;

[0012] A roller in direct contact with the side wall of the drum, the roller is inserted into the central hole of the support frame, and the central shaft of the roller encoder is inserted into the central shaft of the roller and fixed by a positioning screw.

[0013] Specifically, the bottom end of the bracket is connected to the chassis through bolts, the top end of the bracket is connected to the support frame of the encoder assembly module through bolts, and the connection holes of the bracket are connected to the lead screw through bolts.

[0014] Furthermore, the linear motor and the electromagnetic ultrasonic monitoring probe are connected by threads, and the external module of the linear motor further includes: a power supply and a control system. The control system receives the control instructions sent by the control chip ESP32S3 of the wireless signal transmission module to drive the linear motor to rotate forward and backward.

[0015] Even further, the signal filtering and amplifying module is provided with an OPA2171 chip, an LT1568 chip, and an AD8031 chip. The OPA2171 chip is used to amplify the received acoustic emission signal, the LT1568 chip is used to filter the amplified signal, and the AD8031 chip is used to sort out and stabilize the signal that has undergone amplification and filtering processing.

[0016] Still further, the signal acquisition module is provided with an ADA4932 chip, two AD7626 chips. The ADA4932 chip is used to convert the acoustic emission signal from a single-ended signal into a differential signal. The VCM pin of the AD7626 chip outputs a common-mode voltage, which is amplified by the AD8031 chip and then input to the VOCM pin of the ADA4932 chip, so that this signal serves as the reference voltage when the AD7626 chip performs analog-to-digital signal conversion.

[0017] Also further, the wireless signal transmission module is provided with a control chip ESP32S3. The control chip ESP32S3 is used to receive the rotation direction and rotation speed of the drum monitored by the encoder assembly module, and send the moving direction and moving speed required by the electromagnetic ultrasonic monitoring probe to the linear motor, so that the linear motor drives the electromagnetic ultrasonic monitoring probe to move.

[0018] Preferably, the chassis, the bracket, the lead screw, and the support frame are all made of stainless steel.

[0019] An on-line monitoring method for the damage of the steel wire rope of a gantry crane includes the following steps: The steel wire rope is wound around the crane drum. As the lifted and lowered goods are hoisted and lowered, the steel wire rope is tightened or loosened on the drum;

[0020] The electromagnetic ultrasonic monitoring probe is arranged on the crane drum and is close to the winding point position of the steel wire rope;

[0021] The roller of the roller encoder contacts the side plate on one side of the reel and rolls as the reel rotates. The output signal of the roller encoder is sent to the control chip ESP32S3 of the wireless signal transmission module;

[0022] The control chip ESP32S3 calculates the moving direction and moving speed of the electromagnetic ultrasonic monitoring probe according to the received encoder signal, and sends the control signal to the probe drive system;

[0023] The probe drive system drives the electromagnetic ultrasonic monitoring probe to move and ensures that the monitoring probe always corresponds to the wire rope winding point;

[0024] The signal filtering and amplification module is responsible for filtering and amplifying the acoustic emission signal received by the electromagnetic ultrasonic monitoring probe, and transmitting the processed voltage signal to the signal acquisition module;

[0025] The signal acquisition module converts the acoustic emission signal from an analog voltage signal into a digital signal and sends it to the wireless signal transmission module;

[0026] The wireless signal transmission module sends the digitized acoustic emission signal to the remote computer monitoring system;

[0027] The remote computer monitoring system analyzes the acoustic emission signal and extracts characteristic parameters, and finally identifies the safety state of the wire rope.

[0028] Compared with the prior art, the on-line monitoring device for wire rope damage of the gantry crane described in the present utility model and the method using the same have the following advantages:

[0029] In the on-line monitoring device for wire rope damage of the gantry crane provided by the present utility model and the method using the same, driven by the motor, the electromagnetic ultrasonic monitoring probe continuously moves along with the winding of the wire rope and always keeps following the contact position between the wire rope and the reel. At the same time, an encoder assembly module (roller encoder) is used to contact the side wheels on both sides of the reel. The encoder rotates as the reel rotates. The rotation direction and rotation speed of the encoder are transmitted to the wireless signal transmission module. The control chip calculates the moving direction and moving speed of the electromagnetic ultrasonic monitoring probe according to the received encoder signal, and sends the control signal to the linear motor (probe drive system). In addition, after the electromagnetic ultrasonic monitoring probe receives the acoustic emission signal of the crane wire rope, through the signal filtering and amplification module, the signal acquisition module, and the wireless signal transmission module, the acoustic emission signal is transmitted to the remote computer monitoring system by wireless transmission. The remote computer monitoring system is installed with upper computer software for analyzing the received acoustic emission signal and judging the damage condition of the wire rope. Description of the Drawings

[0030] Figure 1A schematic diagram of the framework structure of the online monitoring device for wire rope damage of a gantry crane provided by an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the assembly structure of the online monitoring device for wire rope damage of a gantry crane provided by an embodiment of the utility model;

[0032] Figure 3 A schematic structural diagram of an encoder assembly module in an online monitoring device for wire rope damage of a gantry crane provided in an embodiment of the utility model.

[0033] Reference numerals:

[0034] 1-motor; 2-motor control box; 3-reel; 4-bracket;

[0035] 5- encoder assembly module; 51- roller encoder; 52- support frame; 53- roller; 54- fastening screw; 55- positioning screw;

[0036] 6-lead screw; 7-linear motor; 8-electromagnetic ultrasonic monitoring probe;

[0037] 9-signal filtering and amplification module; 10-signal acquisition module; 11-wireless signal transmission module; 12-remote computer monitoring system;

[0038] 13- Base frame. DETAILED DESCRIPTION

[0039] In view of the shortcomings of the existing strong magnetic and weak magnetic detection wire ropes, this application realizes online monitoring of wire rope damage based on the principle of acoustic emission. The acoustic emission phenomenon refers to the stress wave generated by the rapid release of strain energy caused by crack expansion, plastic deformation or phase change in the material, and propagates in the material in the form of elastic waves. Specifically, acoustic emission detection receives and converts the sound wave signal into an electrical signal, and realizes detection by identifying the relationship between the characteristic parameters of the signal and the material damage. The probe used in the common acoustic emission detection is a piezoelectric ultrasonic probe. During the detection, the probe needs to be in direct contact with the surface of the material to be detected, and a coupling agent needs to be applied to the contact surface between the probe and the material to be detected to increase the transmission of the sound wave. The surface of the steel wire rope for cranes is covered with gullies and has a large roughness. During the process of crane lifting goods, the steel wire rope moves rapidly. The acoustic emission probe using direct contact will cause serious wear on the probe surface, reducing the life of the probe and the coupling effect is also poor.

[0040] This application uses an electromagnetic ultrasonic probe as the sound - electricity conversion medium for the acoustic emission detection of steel ropes; the electromagnetic ultrasonic probe can receive the acoustic emission signals of steel ropes under non - contact conditions; for the selection of the detection position, it is necessary to be as close as possible to the acoustic emission source to improve the detection sensitivity. When the crane hoists goods, the steel rope is in a tensioned state. When the goods are lifted or lowered, the steel rope winds tightly or loosely around the drum as the drum rotates; the steel rope at the contact position with the drum is subject to both tensile stress and bending stress while being stressed, and the stress state is very complex. If there are defects inside the steel rope, acoustic emission signals are most likely to be excited at this position; therefore, the detection position of this application is selected at the contact position between the steel rope and the drum.

[0041] For the sake of easy understanding, the following will combine with the drawings in the specification to describe in detail the on - line monitoring device for the damage of the steel rope of the gantry crane provided by the embodiments of the present utility model and the method using the same.

[0042] The embodiments of the present utility model provide an on - line monitoring device for the damage of the steel rope of a gantry crane, as Figures 1-3 shown, including: a motor 1 and a motor control box 2 for controlling the rotation of the motor 1; the motor 1 is used to drive the drum 3 to rotate, drive the steel rope to wind around the drum 3, and the drum 3 is used to drive the lifting and lowering of the goods to be hoisted;

[0043] A bracket 4, the top of the bracket 4 is connected with an encoder assembly module 5, and one side of the bracket 4 has a connection hole, and a lead screw 6 is inserted and fixed in the connection hole; a linear motor 7 is arranged at the lead screw 6, and the linear motor 7 is equipped with an electromagnetic ultrasonic monitoring probe 8, and the linear motor 7 is used to drive the electromagnetic ultrasonic monitoring probe 8 to slide left and right along the straight line on the lead screw 6;

[0044] The encoder assembly module 5 is in contact with the drum 3, an electromagnetic ultrasonic monitoring probe 8 is arranged at the drum 3, the electromagnetic ultrasonic monitoring probe 8 is connected with a signal filtering and amplifying module 9, the signal filtering and amplifying module 9 is connected with a signal acquisition module 10, the signal acquisition module 10 is connected with a wireless signal transmitting module 11, and the wireless signal transmitting module 11 is connected with a remote computer monitoring system 12; moreover, the encoder assembly module 5 is connected with the wireless signal transmitting module 11, and the linear motor 7 is also connected with the wireless signal transmitting module 11.

[0045] An on - line monitoring method for the damage of the steel rope of a gantry crane includes the following steps: The steel rope is wound around the crane drum 3, and as the goods to be hoisted are lifted and lowered, the steel rope winds tightly or loosely around the drum 3;

[0046] The electromagnetic ultrasonic monitoring probe 8 is arranged on the crane drum 3 and close to the winding point position of the steel rope;

[0047] The roller of the roller encoder 51 contacts the side plate on one side of the reel 3 and rolls as the reel 3 rotates. The output signal of the roller encoder 51 is sent to the control chip ESP32S3 of the wireless signal transmitting module 11;

[0048] The control chip ESP32S3 calculates the moving direction and moving speed of the electromagnetic ultrasonic monitoring probe 8 according to the received encoder signal, and sends the control signal to the probe drive system;

[0049] The probe drive system drives the electromagnetic ultrasonic monitoring probe 8 to move and ensures that the monitoring probe always corresponds to the wire rope winding point;

[0050] The signal filtering and amplifying module 9 is responsible for filtering and amplifying the acoustic emission signal received by the electromagnetic ultrasonic monitoring probe 8, and transmitting the processed voltage signal to the signal acquisition module 10;

[0051] The signal acquisition module 10 converts the acoustic emission signal from an analog voltage signal into a digital signal and sends it to the wireless signal transmitting module 11;

[0052] The wireless signal transmitting module 11 sends the digitized acoustic emission signal to the remote computer monitoring system 12;

[0053] The remote computer monitoring system 12 analyzes the acoustic emission signal and extracts characteristic parameters, and finally identifies the safety state of the wire rope.

[0054] Compared with the prior art, the on-line monitoring device for wire rope damage of the gantry crane described in the embodiment of the present utility model has the following advantages:

[0055] In the on-line monitoring device for wire rope damage of the gantry crane provided by the embodiment of the present utility model, driven by the motor 1, the electromagnetic ultrasonic monitoring probe 8 continuously moves along with the winding of the wire rope, and always keeps following the contact position between the wire rope and the reel 3; at the same time, the encoder assembly module 5 (roller encoder) is used to contact the side wheels on both sides of the reel 3, and the encoder rotates as the reel 3 rotates. The rotation direction and rotation speed of the encoder are transmitted to the wireless signal transmitting module 11, and the control chip calculates the moving direction and moving speed of the electromagnetic ultrasonic monitoring probe 8 according to the received encoder signal, and sends the control signal to the linear motor 7 (probe drive system); in addition, after the electromagnetic ultrasonic monitoring probe 8 receives the acoustic emission signal of the crane wire rope, through the signal filtering and amplifying module 9, the signal acquisition module 10, and the wireless signal transmitting module 11, the acoustic emission signal is transmitted to the remote computer monitoring system 12 by wireless transmission. The remote computer monitoring system 12 is installed with upper computer software for analyzing the received acoustic emission signal and judging the damage condition of the wire rope.

[0056] In actual application, such asFigures 1-3 As shown in the figure, the on-line monitoring device for the damage of the steel wire rope of the gantry crane provided by the embodiment of the present utility model may further include: a chassis 13, and the chassis 13 can be used to fixedly support the whole set of monitoring devices; the bottom of the chassis 13 can be connected to the metal structure of the crane through anchor bolts, and the top can be connected to the feet and brackets 4 of the motor 1 through fastening bolts, so as to provide support for the motor 1 and the bracket 4.

[0057] Among them, as Figures 1-3 shown, the above encoder assembly module 5 may include: a roller encoder 51, the roller encoder 51 can be inserted into the central hole of the support frame 52, and the fastening screw 54 can pass through the positioning hole of the support frame 52 and be screwed into the positioning hole of the roller encoder 51, so as to realize the fixation of the roller encoder 51 and the support frame 52;

[0058] A roller 53 in direct contact with the side wall of the drum 3, the roller 53 can be inserted into the central hole of the support frame 52, and the central axis of the roller encoder 51 can be inserted into the central axis of the roller 53 and fixed by a positioning screw 55;

[0059] During use, the roller 53 is in direct contact with the side surface of the drum 3, the rotation of the drum 3 drives the rotation of the roller 53, which in turn drives the rotation of the roller encoder 51, and then the roller encoder 51 sends the rotation information of the drum 3 to the control chip ESP32S3 of the wireless signal transmission module 11.

[0060] Specifically, as Figures 1-3 shown, the bottom end of the above bracket 4 can be connected to the chassis 13 through bolts, the top end of the bracket 4 can be connected to the support frame 52 of the encoder assembly module 5 through bolts, and the connection hole of the bracket 4 can be connected to the lead screw 6 through bolts.

[0061] Further, as Figures 1-3 shown, the above linear motor 7 and the electromagnetic ultrasonic monitoring probe 8 can be connected by threads, and the external module of the linear motor 7 may further include: a power supply and a control system, and the control system receives the control instructions sent by the control chip ESP32S3 of the wireless signal transmission module 11 to drive the linear motor 7 to rotate forward and backward.

[0062] Further, the above signal filtering and amplifying module 9 may be provided with an OPA2171 chip, an LT1568 chip, and an AD8031 chip. The OPA2171 chip can be used to amplify the received acoustic emission signal (for example: perform two-stage amplification with a total amplification factor of 10 times). The LT1568 chip can be used to filter the amplified signal (for example: perform low-pass and high-pass filtering simultaneously, with a low-pass filtering frequency of 10 MHz and a high-pass filtering frequency of 200 kHz). The AD8031 chip can be used to organize and regulate the signal that has undergone amplification and filtering processing. The two lead-out wires of the electromagnetic ultrasonic monitoring probe 8 are respectively connected to the IN port and the ground. The acoustic emission signal collected by the electromagnetic ultrasonic monitoring probe 8 is input between the IN port and the signal ground and output between the OUT port and the signal ground.

[0063] Still further, the above signal acquisition module 10 may be provided with an ADA4932 chip, two AD7626 chips. The ADA4932 chip can be used to convert the acoustic emission signal from a single-ended signal to a differential signal. The VCM pin of the AD7626 chip outputs a common-mode voltage, which, after being amplified by the AD8031 chip, is input to the VOCM pin of the ADA4932 chip to serve as the reference voltage when the AD7626 chip performs analog-to-digital signal conversion. The OUT port of the signal filtering and amplifying module 9 is connected to the OUT port of the signal acquisition module 10. The amplified and filtered acoustic emission signal is input through the +IN pin of the ADA4932 chip and output through the -OUT and +OUT pins. The +IN pin of the AD8031 chip is connected to the VCM pin of the AD7626 chip.

[0064] Furthermore, the AD7626 chip is responsible for converting the acoustic emission signal from an analog signal into a digital signal and sending the conversion result to the control chip ESP32S3. The control chip ESP32S3 sends the received acoustic emission signal to the remote computer monitoring system by wireless transmission. The function of the control chip ESP32S3 is the control of the entire hardware system and wireless data transmission. The EN0 and EN1 pins of the AD7626 chip are respectively connected to the IO34 and IO35 pins of the control chip ESP32S3. The CNV-, CNV+, D-, and D+ pins of the AD7626 chip are respectively connected to the IO18, IO5, IO17, and IO16 pins of the control chip ESP32S3. The IO32, IO33, and IO25 pins of the control chip ESP32S3 are respectively connected to the A, B, and Z output leads of the roller encoder to receive the output signal of the encoder. According to the ratio of the diameters of the roller and the side wheel of the reel in the encoder assembly module, the number of revolutions of the reel is calculated, and then the moving distance of the linear motor is calculated. At the beginning of the monitoring, the linear motor is manually adjusted to drive the electromagnetic ultrasonic monitoring probe to move to the winding point of the steel wire rope on the drum. When the crane starts to work, the reel rotates one circle, the steel wire rope winds one circle on it, and the linear motor drives the electromagnetic ultrasonic monitoring probe to move a distance equal to the diameter of the steel wire rope. The IO26 and IO27 of the control chip ESP32S3 are connected to the DIR+ and DIR- of the control system of the linear motor to respectively control the forward and reverse rotations of the linear motor.

[0065] Preferably, as Figures 1-3 shown, the above-mentioned chassis 13, bracket 4, lead screw 6, and support frame 52 can all be made of stainless steel.

[0066] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An on-line monitoring device for wire rope damage of a gantry crane, characterized in that, Including: A motor and a motor control box for controlling the rotation of the motor; the motor is used to drive a winding drum to rotate, drive a steel wire rope to wind around the winding drum, and the winding drum is used to drive the lifting and lowering of the goods to be hoisted; A bracket, the top end of the bracket is connected with an encoder assembly module, and one side of the bracket has a connection hole, and a lead screw is inserted and fixed in the connection hole; a linear motor is arranged at the lead screw, and the linear motor is equipped with an electromagnetic ultrasonic monitoring probe, and the linear motor is used to drive the electromagnetic ultrasonic monitoring probe to slide left and right along the straight line on the lead screw; The encoder assembly module is in contact with the winding drum, the electromagnetic ultrasonic monitoring probe is arranged at the winding drum, the electromagnetic ultrasonic monitoring probe is connected with a signal filtering and amplifying module, the signal filtering and amplifying module is connected with a signal acquisition module, the signal acquisition module is connected with a wireless signal transmitting module, and the wireless signal transmitting module is connected with a remote computer monitoring system; and, the encoder assembly module is connected with the wireless signal transmitting module, and the linear motor is also connected with the wireless signal transmitting module.

2. The on-line monitoring device for wire rope damage of a gantry crane according to claim 1, characterized in that, It also includes: A chassis, and the chassis is used to fixedly support the whole set of monitoring devices; the bottom of the chassis is connected with the crane metal structure through anchor bolts, and the top is connected with the feet of the motor and the bracket through fastening bolts.

3. The on-line monitoring device for wire rope damage of the gantry crane according to claim 2, characterized in that, The encoder assembly module includes: a roller encoder, the roller encoder is inserted into the central hole of the support frame, and the fastening screw passes through the positioning hole of the support frame and is screwed into the positioning hole of the roller encoder; A roller in direct contact with the side wall of the winding drum, the roller is inserted into the central hole of the support frame, and the central shaft of the roller encoder is inserted into the central shaft of the roller and fixed by a positioning screw.

4. The on-line monitoring device for damage of the wire rope of the gantry crane according to claim 3, characterized in that, The bottom end of the bracket is connected with the chassis through bolts, the top end of the bracket is connected with the support frame of the encoder assembly module through bolts, and the connection hole of the bracket is connected with the lead screw through bolts.

5. The on-line monitoring device for the damage of the wire rope of the gantry crane according to claim 1, characterized in that, The linear motor and the electromagnetic ultrasonic monitoring probe are connected by threads, and the external module of the linear motor further includes: a power supply and a control system, and the control system receives control instructions sent by the control chip ESP32S3 of the wireless signal transmitting module to drive the linear motor to rotate forward and backward.

6. The on-line monitoring device for wire rope damage of a gantry crane according to claim 1, characterized in that The signal filtering and amplifying module is provided with an OPA2171 chip, an LT1568 chip and an AD8031 chip, and the OPA2171 chip is used to amplify the received acoustic emission signal, the LT1568 chip is used to filter the amplified signal, and the AD8031 chip is used to sort and stabilize the signal after amplification and filtering processing.

7. The on-line monitoring device for damage of the wire rope of the gantry crane according to claim 6, characterized in that, The signal acquisition module is provided with an ADA4932 chip, an AD7626 chip and an AD7626 chip. The ADA4932 chip is used to convert the acoustic emission signal from a single-ended signal into a differential signal. The VCM pin of the AD7626 chip outputs a common-mode voltage, which is amplified by the AD8031 chip and then input to the VOCM pin of the ADA4932 chip, so that this signal serves as the reference voltage when the AD7626 chip performs analog-to-digital signal conversion.

8. The on-line monitoring device for damage of wire ropes of a gantry crane according to claim 7, characterized in that, The wireless signal transmission module is provided with a control chip ESP32S3. The control chip ESP32S3 is used to receive the rotation direction and rotation speed of the reel monitored by the encoder assembly module, and send the moving direction and moving speed required by the electromagnetic ultrasonic monitoring probe to the linear motor, so that the linear motor drives the electromagnetic ultrasonic monitoring probe to move.

9. The on-line monitoring device for damage of wire ropes of a gantry crane according to claim 2, characterized in that The chassis, the bracket and the lead screw are all made of stainless steel.

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