A rope-breaking anti-fall device and control method for bridge crane

Abstract

The present invention provides a rope-breaking anti-falling device and control method for a bridge crane, belonging to the technical field of bridge crane safety protection. It solves the problem in the prior art that the wire rope of a bridge crane is prone to rope breaking and falling objects due to untimely maintenance. The rope-breaking anti-falling device for a bridge crane comprises a housing, a wedge block seat rotatably provided in the housing, a mounting hole for the wire rope to be passed through the wedge block seat, a wedge block provided in the mounting hole, and the larger end of the wedge block abutting against the inner side wall of the housing. When the wedge block seat rotates, the wedge block can be inserted into the mounting hole toward the smaller end under the push of the inner side wall of the housing and press the wire rope against the hole wall of the mounting hole. The present invention has the advantage of preventing the occurrence of falling objects safety accidents due to wire rope breakage in bridge cranes.

Description

Technical Field

[0001] The present invention belongs to the technical field of safety protection of bridge cranes, and relates to a rope-breaking anti-falling device for bridge cranes and a control method thereof. Background Art

[0002] With the rapid development of my country's economy, the demand for cranes in industries such as industry and construction is increasing. Among them, bridge cranes are the most widely used and the most numerous. Bridge cranes are primarily composed of a bridge frame, a trolley running mechanism, a small trolley running mechanism, and a lifting mechanism. Currently, the suspended objects in the lifting mechanism of general bridge cranes are suspended below the boom with wire ropes. The lifting and lowering of the suspended objects are achieved by pulling the wire ropes, and the forward and backward movement of the suspended objects is achieved by sliding the pulleys on the boom back and forth. During the lifting process, the wire ropes need to pass around multiple pulleys. Due to prolonged friction, the wire ropes often break. If maintenance is not carried out in a timely manner, the ropes may break and objects may fall, causing unnecessary losses or casualties. Summary of the Invention

[0003] The present invention aims to solve the above problems in the existing technology and proposes a rope-breakage prevention device and control method for a bridge crane. The technical problem solved by the present invention is how to prevent the occurrence of falling objects safety accidents due to wire rope breakage in bridge cranes.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A rope-breaking anti-fall device for a bridge crane comprises a shell, characterized in that a wedge block seat is rotatably arranged in the shell, a mounting hole for a steel wire rope to be passed through is opened on the wedge block seat, a wedge block is arranged in the mounting hole and the larger end of the wedge block abuts against the inner side wall of the shell. When the wedge block seat rotates, the wedge block can be inserted into the mounting hole toward the smaller end under the push of the inner side wall of the shell and press the steel wire rope against the hole wall of the mounting hole. The rope-breaking anti-fall device also includes a control unit, which includes an MCU, a motor for driving the wedge block seat to rotate and electrically connected to the MCU, and a detection component for real-time detection of steel wire rope strain and connected to the MCU signal. The detection component includes a fiber Bragg grating sensor embedded in the steel wire rope.

[0006] The rope-breaking anti-fall device for a bridge crane is arranged at the rope entrance and exit of the bridge crane. First, the fiber Bragg grating sensor embedded in the wire rope can monitor the strain of the wire rope in real time, and transmit the strain data of the wire rope to the MCU in real time. The MCU can obtain the predicted value of the wire rope tension at the next moment through data processing, and compare the predicted value with the preset wire rope tension threshold. If the predicted value exceeds the threshold, the MCU will alarm and control the motor to rotate. After the motor rotates, it drives the wedge block seat to rotate. When the wedge block seat rotates, because the wedge block is partially located in the installation hole, and the direction of the wedge block moving along the installation hole is in the same direction as the rotation direction of the wedge block seat, the wedge block is rotated. 90°, so the wedge is inserted into the mounting hole toward the smaller end under the push of the inner wall of the shell, and because the larger end of the wedge is in contact with the inner wall of the shell, the larger part of the wedge can continuously enter the mounting hole, so the wedge located in the mounting hole can squeeze the wire rope on the adjacent side until the wedge located in the mounting hole can press the wire rope tightly against the hole wall of the mounting hole (that is, the wedge has stuck the wire rope in the mounting hole), thereby avoiding the bridge crane from causing falling objects due to broken wire rope. In addition, the rope-breaking anti-falling device of the above structure can also avoid slipping between the wire rope and the wedge, thereby enhancing the safety and stability of the rope-breaking anti-falling device for the bridge crane.

[0007] In the above-mentioned rope-breaking anti-fall device for a bridge crane, the steel wire rope includes a central wire and several outer wires, and an installation groove is opened on the central wire of the steel wire rope along its length direction. The fiber Bragg grating sensor is pasted in the installation groove by epoxy resin.

[0008] The fiber Bragg grating sensor has the characteristics of small size, light weight, high tensile strength, high compressive strength, waterproof and oil-proof, and fully sealed, and has a small bending radius. The fiber Bragg grating sensor is pasted in the installation groove with epoxy resin, making the fiber Bragg grating sensor not easy to fall off and damaged after installation, and does not affect the fiber Bragg grating sensor's detection of wire rope strain. The wire rope includes a center wire and several outer wires. Placing the fiber Bragg grating sensor on the center wire of the wire rope can more accurately detect the strain of the wire rope. In addition, several outer wires are wrapped around the center wire, and arranging the fiber Bragg grating sensor on the center wire of the wire rope is more convenient.

[0009] In the above-mentioned rope-breaking anti-fall device for a bridge crane, the shell includes a track plate located on the side and having an arc-shaped section, the larger end of the wedge block abuts against the inner wall of the track plate, and the end face of the larger end of the wedge block is in an arc shape that is adapted to the inner wall of the arc-shaped section of the track plate. The distance between the mounting hole and the inner wall of the arc-shaped section of the track plate gradually decreases as the wedge block seat rotates, and the sum of the width of the middle part of the wedge block and the diameter of the wire rope is greater than or equal to the width of the mounting hole. The above structure enables the wedge block located in the mounting hole to move better along the length direction of the wire rope after the wedge block seat rotates (the larger end of the wedge block can rest against the inner wall of the arc section of the track plate and rotate, because the distance between the mounting hole and the inner wall of the arc section of the track plate gradually decreases as the wedge block seat rotates, so that the wedge block can move along the length direction of the wire rope while rotating), and enables the wedge block to better clamp the wire rope in the mounting hole after movement (the sum of the width of the middle part of the wedge block and the diameter of the wire rope is greater than or equal to the width of the mounting hole), thereby avoiding falling objects safety accidents caused by broken wire rope in bridge cranes.

[0010] In the aforementioned rope-breakage prevention device for a bridge crane, the mounting hole is rectangular, and the top, bottom, and side surfaces of the wedge block all abut against the wall of the mounting hole, while the other side surface of the wedge block is positioned adjacent to the wire rope. This structure allows the wedge block to move more smoothly within the mounting hole. When the wedge block seat rotates, the wedge block within the mounting hole can better move along the length of the wire rope, and the movement of the wedge block can better lock the wire rope within the mounting hole, thereby preventing accidents involving falling objects due to wire rope breakage in bridge cranes.

[0011] In the aforementioned rope-breakage prevention device for a bridge crane, the housing includes two opposing clamping plates and a track plate fixedly connected to each of the two clamping plates. A turntable is fixedly mounted at each end of the wedge block seat, each of which is rotatably connected to a corresponding clamping plate. At least one of the turntables is provided with a push rod for facilitating its rotation. This structure enables a motor to drive the turntable via the push rod. Because the wedge block seat is fixedly connected to the turntable, rotation of the turntable drives the wedge block seat to rotate synchronously. This structure enables the rope-breakage prevention device for a bridge crane to utilize the rotation of the wedge block seat to drive the wedge block to clamp the wire rope, thereby preventing slippage between the wire rope and the wedge block, thereby enhancing the safety and stability of the rope-breakage prevention device for a bridge crane.

[0012] A control method for a rope-breaking anti-fall device for a bridge crane, characterized by comprising the following steps:

[0013] Step 1: Using a fiber Bragg grating sensor embedded in the steel wire rope to monitor the strain generated by the steel wire rope under the action of an external load in real time;

[0014] Step 2: Use the MCU to convert the strain generated by the wire rope under the external load into the tension value of the wire rope in real time;

[0015] Step 3: Use the MCU to input the tension value obtained in step 2 into the LSTM model to obtain the predicted value of the wire rope tension at the next moment;

[0016] Step 4: Use the MCU to compare the predicted value with the preset wire rope tension threshold. If the predicted value exceeds the threshold, the MCU will sound an alarm and trigger the rope breakage prevention device to work.

[0017] In the above-mentioned control method for a rope-breaking anti-fall device for a bridge crane, the conversion formula of step 2 is as follows:

[0018] Δλ=K′ ε F / (EA)

[0019] Where: E and A are the elastic modulus and cross-sectional area of ​​the monitoring substrate (wire rope), respectively. The wire rope generates strain under the action of external load and transmits it to the fiber Bragg grating sensor, causing the initial wavelength λ0 of the fiber Bragg grating sensor to change, and the changed λ is obtained. B ,λ B The difference from λ0 is the wavelength drift Δλ of the fiber Bragg grating sensor. When calibrating, using the known F and Δλ, K′ can be calculated by the conversion formula ε ; When used, according to the K' calculated during calibration ε The tension F is calculated by the conversion formula using the Δλ detected by the fiber Bragg grating sensor.

[0020] According to the diffraction principle of fiber Bragg grating, when a beam of light enters the grating, only a certain wavelength of light is reflected, and the remaining wavelengths of light pass through the fiber Bragg grating without loss and continue to transmit forward. The wavelength λ at the peak of the reflected light wave is

[0021] λ=2nΛ (1)

[0022] Where n is the refractive index of the fiber core relative to the central wavelength of free space; Λ is the period of the phase mask grating.

[0023] The initial wavelength λ0 of the fiber Bragg grating sensor can be measured by using a fiber Bragg grating demodulator. g When the change occurs, the elastic-optical effect will cause the grating refractive index to change and the period to stretch. At this time, the central wavelength λ of the fiber Bragg grating sensor is measured by the fiber Bragg grating demodulator. B λ B The difference between λ0 and λ is the wavelength drift of the fiber Bragg grating Δλ. g The relationship is

[0024] Δλ={1-n 2 [P 12 -μ(P 11 +P 12 )] / 2}λ B ε g =K ε ε g (2)

[0025] Where: μ is Poisson's ratio; P 11 , P 12 is the photoelastic effect coefficient; K ε is the strain sensitivity of the fiber Bragg grating.

[0026] Fiber Bragg Grating strain ε g and monitoring substrate (wire rope) strain ε m They are related by the strain transfer rate β,

[0027] ε g =βε m (3)

[0028] Substituting formula (3) into formula (2), we get

[0029] Δλ=K ε βε m =K′ ε ε m (4)

[0030] Where: K′ ε The strain sensitivity of the fiber Bragg grating can be determined by calibration. m The relationship between the cable force F is

[0031] ε m =F / (EA) (5)

[0032] Where: E and A are the elastic modulus and cross-sectional area of ​​the monitoring substrate, respectively.

[0033] Substituting equation (5) into equation (4), we can get the relationship between Δλ and F

[0034] Δλ=K′ ε F / (EA) (6)

[0035] Where: E and A are the elastic modulus and cross-sectional area of ​​the monitoring substrate (wire rope), respectively. The wire rope generates strain under the action of external load and transmits it to the fiber Bragg grating sensor, causing the initial wavelength λ0 of the fiber Bragg grating sensor to change, and the changed λ is obtained. B ,λ BThe difference from λ0 is the wavelength drift Δλ of the fiber Bragg grating sensor. When calibrating, using the known F and Δλ, K′ can be calculated by the conversion formula ε ; When used, according to the K' calculated during calibration ε The tension F is calculated by the conversion formula using the Δλ detected by the fiber Bragg grating sensor.

[0036] Among them, the LSTM model in step three is a long short-term memory neural network (LSTM) time series prediction method based on the attention mechanism (Attention) to calculate the time series prediction value of the wire rope under tension (the Long-Short Term Memory Neural Network (LSTM) paper was first published in 1997).

[0037] The attention mechanism is that the vector c is conditioned on the target sequence y, where the target sequence y depends on the annotation sequence that the encoder maps the input sequence to Each annotation h i Both contain information about the entire input sequence and focus on the part around the i-th word of the input sequence.

[0038] Then, the context vector c i Calculated as the weighted sum h of these annotations i :

[0039]

[0040] Each annotation h j The weight α ij Calculated by the following formula:

[0041]

[0042] The attention mechanism can assign important weights to these different representations, which can identify the most relevant aspects while ignoring noise and redundancy in the input. The incorporation of attention into neural networks can significantly improve performance. By promoting interpretability, the attention mechanism can focus on data and signals detected by sensors, providing a deeper understanding of the internal workings of neural networks. It also reduces the amount of data computation by eliminating sequential input processing, improving computational efficiency. Furthermore, it provides a tool for visualizing the attention weights of deep neural networks. The goal is to interpret and perturb the attention weights in order to simulate changes in the wire rope observed and predicted in hypothetical scenarios.

[0043] LSTMs prevent sudden data loss and increase by maintaining long-term and short-term memories in cell states. Furthermore, three special gates are designed to control the flow of information within the LSTM network: the forget gate, the input gate, and the output gate.

[0044] f t =σ(W f h t-1 +V f x t +b f ) (3)

[0045] i t =σ(W i h t-1 +V i x t +b i ) (4)

[0046] o t =σ(W o h t-1 +V o x t +b o ) (5)

[0047]

[0048]

[0049]

[0050] y t =σ(W y h t +b y ) (9)

[0051] Here f t ,i t and o t are the activation vectors of the forget gate, input gate, and output gate, respectively. Equations (3-5) and (9) are activation functions (usually sigmoid functions), and equation (6) represents the hyperbolic tangent function. Both σ and tanh introduce nonlinearity into the LSTM network. Each value of the vector ranges from 0 to 1 to control the flow of information within the network. The cell state at the current time t is denoted as c t , which is used to store the memory from the previous input. From equation (7), we can see that c t It is based on the previous cell state c t-1 and candidate cell states Updated. In LSTM, not all c t The value of will be updated, which is determined by the forget gate and the input gate. More specifically, in equation (7), f t Decision c t-1 Which value should be added to c t in,i t Decide Which value should be added to ct Next, t Decision c t Which value of should be passed through the hidden state h t Output. Finally, output y t is based on the hidden state h t Calculated as shown in equation (9).

[0052] Compared with the prior art, the advantages of the rope-breaking anti-falling device and control method for bridge cranes are that: when the predicted value of the wire rope tension exceeds the preset wire rope tension threshold, the MCU controls the motor to rotate, and after the motor rotates, it drives the wedge block seat to rotate. Because the wedge block is already partially located in the mounting hole, and the direction of movement of the wedge block along the mounting hole is 90° to the direction of rotation of the wedge block seat, the wedge block can move along the length direction of the wire rope located in the mounting hole under the pressure of the inner wall of the shell track plate, so that a larger part of the wedge block can continuously enter the mounting hole, so the wedge block located in the mounting hole can squeeze the wire rope on the adjacent side until the wedge block located in the mounting hole can force the wire rope to bend and position itself in the mounting hole, that is, the wedge block has stuck the wire rope in the mounting hole, thereby avoiding the bridge crane from causing falling objects due to wire rope breakage. In addition, the rope-breaking anti-falling device with the above structure can also avoid slipping between the wire rope and the wedge block, thereby enhancing the safety and stability of the rope-breaking anti-falling device for bridge cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a three-dimensional structural diagram of a rope-breaking anti-fall device for a bridge crane.

[0054] Figure 2 The present invention is a structural schematic diagram of a rope-breaking anti-fall device for a bridge crane without a splint.

[0055] Figure 3 The invention is a schematic structural diagram of a side view of a rope-breaking anti-fall device for a bridge crane.

[0056] Figure 4 It is a schematic diagram of the three-dimensional structure of the wire rope.

[0057] Figure 5 This is a cross-sectional view of a fiber Bragg grating sensor embedded in the center wire of a steel wire rope.

[0058] Figure 6 It is a cross-sectional view of a fiber Bragg grating sensor embedded in a steel wire rope.

[0059] In the figure, 1. shell; 2. wedge block seat; 3. steel wire rope; 31. center wire; 32. outer wire; 4. mounting hole; 5. fiber Bragg grating sensor; 6. mounting groove; 7. epoxy resin; 8. track plate; 9. splint; 10. turntable; 11. push rod; 12. wedge block. DETAILED DESCRIPTION

[0060] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0061] A rope-breaking anti-fall device for bridge cranes, referring to Figure 1-6 , including a shell 1, in which a wedge block seat 2 is rotatably provided, and a mounting hole 4 for the wire rope 3 to pass through is opened on the wedge block seat 2, and a wedge block 12 is provided in the mounting hole 4 and the larger end of the wedge block 12 abuts against the inner wall of the shell 1. When the wedge block seat 2 rotates, the wedge block 12 can be inserted into the mounting hole 4 toward the smaller end under the push of the inner wall of the shell 1 and press the wire rope 3 against the hole wall of the mounting hole 4. The rope-breaking anti-fall device also includes a control unit, which includes an MCU, a motor for driving the wedge block seat 2 to rotate and electrically connected to the MCU, and a detection component for real-time detection of the strain of the wire rope 3 and connected to the MCU signal. The detection component includes a fiber Bragg grating sensor 5 embedded in the wire rope 3.

[0062] Reference Figure 4 、 Figure 5 and Figure 6 The steel wire rope 3 includes a central wire 31 and a plurality of outer wires 32. A mounting groove 6 is provided on the central wire 31 of the steel wire rope 3 along its length direction. The fiber Bragg grating sensor 5 is adhered to the mounting groove 6 by epoxy resin 7.

[0063] Reference Figure 1 、 Figure 2 and Figure 3 The shell 1 includes a track plate 8 located on the side and having an arc-shaped segment. The larger end of the wedge block 12 abuts against the inner wall of the track plate 8. The end face of the larger end of the wedge block 12 is an arc that is adapted to the inner wall of the arc-shaped segment of the track plate 8. The distance between the mounting hole 4 and the inner wall of the arc-shaped segment of the track plate 8 gradually decreases as the wedge block seat 2 rotates. The sum of the width of the middle part of the wedge block 12 and the diameter of the wire rope 3 is greater than or equal to the width of the mounting hole 4.

[0064] Reference Figure 1 、 Figure 2 and Figure 3 The mounting hole 4 is rectangular, the top surface, bottom surface and side surface of one side of the wedge block 12 are all in contact with the hole wall of the mounting hole 4, and the side surface of the other side of the wedge block 12 is arranged adjacent to the wire rope 3.

[0065] Reference Figure 1 、 Figure 2 and Figure 3The shell 1 includes two oppositely arranged splints 9 and the track plates 8 respectively fixedly connected to the two splints 9. Turntables 10 are respectively fixed at both ends of the wedge block seat 2. The two turntables 10 are respectively rotatably connected to the corresponding splints 9. At least one turntable 10 is provided with a push rod 11 for conveniently driving its rotation.

[0066] A control method for a rope-breaking anti-fall device for a bridge crane comprises the following steps:

[0067] Step 1: Using the fiber Bragg grating sensor 5 embedded in the steel wire rope 3 to monitor the strain generated by the steel wire rope 3 under the external load in real time;

[0068] Step 2: Using the MCU, the strain generated by the steel wire rope 3 under the external load is converted into the tension value of the steel wire rope 3 in real time;

[0069] Step 3: Use the MCU to input the tension value obtained in step 2 into the LSTM model to obtain the predicted value of the tension of the wire rope 3 at the next moment;

[0070] Step 4: Use the MCU to compare the predicted value with the preset threshold value of the wire rope 3 tension. If the predicted value exceeds the threshold value, the MCU will issue an alarm and trigger the rope breakage prevention device to work.

[0071] The conversion formula of step 2 is as follows:

[0072] Δλ=K′ ε F / (EA)

[0073] Where: E and A are the elastic modulus and cross-sectional area of ​​the monitoring substrate (wire rope 3), respectively. The wire rope 3 generates strain under the action of external load and transmits it to the fiber Bragg grating sensor 5, causing the initial wavelength λ0 of the fiber Bragg grating sensor 5 to change, and the changed λ is obtained. B ,λ B The difference from λ0 is the wavelength drift Δλ of the fiber Bragg grating sensor 5. During calibration, using the known F and Δλ, K′ can be calculated by the conversion formula: ε ; When used, according to the K' calculated during calibration ε The tension F is calculated by the conversion formula using the Δλ detected by the fiber Bragg grating sensor 5 .

[0074] Working principle: The rope-breaking anti-fall device for bridge cranes is arranged at the rope entrance and exit of the bridge crane. First, the fiber Bragg grating sensor 5 embedded in the wire rope 3 can monitor the strain of the wire rope 3 in real time, and transmit the strain data of the wire rope 3 to the MCU in real time. The MCU can obtain the predicted value of the tension of the wire rope 3 at the next moment through data processing, and compare the predicted value with the preset threshold value of the tension of the wire rope 3. If the predicted value exceeds the threshold, the MCU will alarm and control the rotation of the motor. After the motor rotates, it drives the wedge block seat 12 to rotate. When the wedge block seat 12 rotates, because the wedge block 12 is partially located in the mounting hole 4, and the direction of movement of the wedge block 12 along the mounting hole 4 is 90° to the direction of rotation of the wedge block seat 2, the wedge block 12 is inserted into the mounting hole 4 toward the smaller end under the push of the inner side wall of the shell 1 (the larger end of the wedge block 12 can be against the inner wall of the arc section of the track plate 8 of the shell 1 and rotate, because the mounting hole 4 is not in the same direction as the wedge block seat 2, the wedge block 12 is inserted into the mounting hole 4 toward the smaller end under the push of the inner side wall of the shell 1 (the larger end of the wedge block 12 can be against the inner wall of the arc section of the track plate 8 of the shell 1 and rotate). The distance between the mounting hole 4 and the inner wall of the arc-shaped section of the track plate 8 gradually decreases as the wedge block seat 2 rotates toward the track plate 8, so that the wedge block 12 can be inserted into the mounting hole 4 toward the smaller end while rotating). Because the larger end of the wedge block 12 abuts against the inner side wall of the shell 1, the larger part of the wedge block 12 can continuously enter the mounting hole 4, so the wedge block 12 located in the mounting hole 4 can squeeze the wire rope 3 on the adjacent side until the wedge block 12 located in the mounting hole 4 can press the wire rope 3 against the hole wall of the mounting hole 4 (that is, the wedge block 12 has stuck the wire rope 3 in the mounting hole 4), thereby avoiding the bridge crane from causing a falling object safety accident due to the breakage of the wire rope 3. In addition, the rope-breaking anti-falling device of the above structure can utilize the rotation of the wedge block seat 2 to drive the wedge block 12 to stick the wire rope 3, thereby avoiding slipping between the wire rope 3 and the wedge block 12, thereby enhancing the safety and stability of the rope-breaking anti-falling device for the bridge crane.

[0075] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A rope-breaking anti-fall device for a bridge crane, comprising a housing (1), characterized in that: A wedge block seat (2) is rotatably provided in the housing (1), and a mounting hole (4) for the steel wire rope (3) to pass through is provided on the wedge block seat (2). A wedge block (12) is provided in the mounting hole (4), and the larger end of the wedge block (12) abuts against the inner wall of the housing (1). When the wedge block seat (2) rotates, the wedge block (12) can be pushed down by the inner wall of the housing (1) so that the smaller end of the wedge block (12) is inserted into the mounting hole (4) and presses the steel wire rope (3) against the hole wall of the mounting hole (4). The housing (1) includes a track plate (8) located at the side and having an arc segment. The larger end of the wedge block (12) abuts against the inner wall of the track plate (8). The wedge block (12) ) has an end face of a larger end in an arc shape that matches the inner wall of the arc section of the track plate (8); the distance between the mounting hole (4) and the inner wall of the arc section of the track plate (8) gradually decreases as the wedge block seat (2) rotates; the sum of the width of the middle portion of the wedge block (12) and the diameter of the wire rope (3) is greater than or equal to the width of the mounting hole (4); the rope-breaking anti-fall device further includes a control unit, which includes an MCU, a motor for driving the wedge block seat (2) to rotate and electrically connected to the MCU, and a detection component for real-time detection of the strain of the wire rope (3) and connected to the MCU signal; the detection component includes a fiber Bragg grating sensor (5) embedded in the wire rope (3).

2. The rope-breaking anti-falling device for a bridge crane according to claim 1, characterized in that: The steel wire rope (3) comprises a central wire (31) and a plurality of outer wires (32). A mounting groove (6) is provided on the central wire (31) of the steel wire rope (3) along its length direction. The fiber Bragg grating sensor (5) is adhered to the mounting groove (6) by epoxy resin (7).

3. A rope-breaking anti-falling device for a bridge crane according to claim 1 or 2, characterized in that: The mounting hole (4) is rectangular, the top surface, the bottom surface and the side surface on one side of the wedge block (12) are all in contact with the hole wall of the mounting hole (4), and the side surface on the other side of the wedge block (12) is arranged adjacent to the wire rope (3).

4. A rope-breaking anti-falling device for a bridge crane according to claim 1 or 2, characterized in that: The housing (1) comprises two clamping plates (9) arranged opposite to each other and the track plates (8) respectively fixedly connected to the two clamping plates (9); a turntable (10) is fixedly provided at both ends of the wedge seat (2); the two turntables (10) are respectively rotatably connected to the corresponding clamping plates (9); and at least one of the turntables (10) is provided with a push rod (11) for conveniently driving the turntable (10) to rotate.

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