Magnetostriction torsion guided wave detection system and method for parallel steel wire rope broken wire defect

Abstract

The invention discloses a magnetostrictive torsional guided wave detection system and method for a parallel steel wire rope broken wire defect, and belongs to the technical field of parallel steel wire rope broken wire defect detection. The device comprises a portable control end, torsion guided wave control equipment, and a torsion guided wave excitation sensor and a torsion guided wave receiving sensor which are arranged on parallel steel wire ropes at intervals, the torsional guided wave excitation sensor and the torsional guided wave receiving sensor are respectively connected with the torsional guided wave control equipment through wires; the torsional guided wave excitation sensor is used for exciting torsional guided waves on the parallel steel wire rope; and the torsional guided wave receiving sensor is used for receiving and transmitting torsional guided wave echo signals generated when the torsional guided waves are propagated on the parallel steel wire rope. The torsion guided wave excitation sensor and the torsion guided wave receiving sensor are installed on the surface of the parallel steel wire rope, torsion guided waves with the specified frequency are excited on the parallel steel wire rope, the parallel steel wire rope is detected, and secondary damage to the parallel steel wire rope is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of parallel steel wire rope broken wire defect detection, and in particular to a magnetostrictive torsional guided wave detection system and method for parallel steel wire rope broken wire defects. Background Art

[0002] Parallel steel cables are one of the main load-bearing components of long-span bridges. At present, the commonly used parallel steel cable detection method in my country is the manual detection method. The disadvantages of this method are high labor costs, the need to detect each parallel steel cable in the entire bridge, and the possibility of causing secondary damage to the steel cables.

[0003] Based on the characteristics of long transmission distance and wide transmission range of guided wave, magnetostrictive guided wave uses magnetic-acoustic transduction mechanism. During detection, the whole process of detection can be completed by placing sensors on the components. It has the advantages of convenient operation and simple method. Therefore, compared with the traditional manual detection method, the magnetostrictive guided wave detection method effectively reduces the labor cost and will not cause secondary damage to the components, and has good application prospects.

[0004] At present, relevant domestic technical personnel have carried out relevant research in the field of magnetostrictive guided wave non-destructive testing. For example, patent document CN108051502A discloses a method for detecting fatigue damage of cables, including a magnetostrictive guided wave excitation sensor and a magnetostrictive guided wave receiving sensor. The detection method can detect the fatigue damage of the cable according to the energy conversion efficiency curve of the receiving process obtained, and analyze the fatigue state of the cable by extracting the time domain signal. The defects of parallel steel wire ropes include broken wires, rust, and relaxation. In addition to broken wire defects, the guided wave echo signal obtained by the magnetostrictive guided wave detection method also contains echo data of non-broken wire defects such as rust and relaxation of the steel wire rope. These echo signals appear on the waveform diagram at the same time and cannot be distinguished by the waveform shape, which brings difficulties to the identification of broken wire defects of parallel steel wire ropes. It is a technical problem that needs to be solved urgently to discover and identify broken wire defects of parallel steel wire ropes.

[0005] Therefore, it is necessary to provide a magnetostrictive torsional guided wave detection system and method for broken wire defects in parallel steel wire ropes. Summary of the invention

[0006] The purpose of the present invention is to provide a magnetostrictive torsional waveguide detection system and method for broken wire defects in parallel steel wire ropes, so as to solve the problem of accurately distinguishing the waveguide echo signals of broken wire defects from those of rust and relaxation defects without causing secondary damage to the parallel steel wire ropes, more conveniently realizing accurate detection of broken wire defects in steel wire ropes, and determining the specific position of the broken wire defects in the parallel steel wire ropes.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A magnetostrictive torsion waveguide detection system for broken wire defects of parallel steel wire ropes, comprising: a portable control terminal, a torsion waveguide control device, and a torsion waveguide excitation sensor and a torsion waveguide receiving sensor installed at intervals on the parallel steel wire ropes;

[0009] The portable control terminal, the torsional waveguide excitation sensor and the torsional waveguide receiving sensor are respectively connected to the torsional waveguide control device by wire;

[0010] Wherein, the portable control terminal is used to set working parameters, transmit the set working parameters to the torsional waveguide control device, and display the broken wire defect information of the parallel steel wire rope;

[0011] Furthermore, the portable control terminal is a portable computer, and the portable computer includes a computer operating system and torsional guided wave detection system control software;

[0012] The torsional guided wave excitation sensor is used to excite the torsional guided wave on the parallel steel wire ropes to detect the parallel steel wire ropes;

[0013] The torsional guided wave receiving sensor is used to receive and transmit the torsional guided wave echo signal generated when the torsional guided wave propagates on the parallel steel wire rope;

[0014] The torsional waveguide control device is used to generate a waveguide excitation signal and distribute it to the torsional waveguide excitation sensor, receive and process the torsional waveguide echo signal, determine whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor is a broken wire defect echo signal of the parallel steel wire rope, and locate the specific position of the broken wire defect in the parallel steel wire rope.

[0015] Furthermore, the torsional waveguide control device includes a central processing module, a waveguide excitation module, a sensor connection module and a waveguide receiving module;

[0016] The central processing module is connected to the waveguide excitation module and the waveguide receiving module respectively, and the sensor connection module is connected to the waveguide receiving module and the waveguide excitation module respectively;

[0017] The central processing module is used to analyze and process the torsional waveguide echo signal and transmit it to the portable control terminal and send a frequency selection signal to the waveguide excitation module;

[0018] The waveguide excitation module is used to receive the frequency selection signal to generate a waveguide excitation signal, and transmit the waveguide excitation signal to the sensor connection module;

[0019] The sensor connection module is used to send a pulse electrical signal, transmit the waveguide excitation signal to the torsional waveguide excitation sensor, and transmit the torsional waveguide echo signal received by the torsional waveguide receiving sensor to the waveguide receiving module;

[0020] The waveguide receiving module is used to digitize the torsional waveguide echo signal after amplification and filtering steps and transmit it to the central processing module;

[0021] The pulse electrical signal is used to control the torsional waveguide excitation sensor and the torsional waveguide receiving sensor to work in coordination.

[0022] Furthermore, the central processing module is a master control circuit for receiving and processing instructions from the portable control terminal.

[0023] Furthermore, the waveguide excitation module is a programmable sinusoidal wave signal generating circuit, and the sinusoidal wave signal generating circuit includes a power amplifier and a transformer.

[0024] Furthermore, the waveguide receiving module is a combination circuit including an acquisition and preamplification circuit and an analog filtering circuit, and the combination circuit includes a source filter, a signal amplifier and a filtering element.

[0025] Furthermore, the sensor connection module is a programmable sinusoidal wave signal distribution circuit, and the sinusoidal wave signal distribution circuit includes a counter and a single-chip microcomputer.

[0026] Furthermore, the torsional waveguide excitation sensor includes an excitation coil and a first magnetizer; and the torsional waveguide receiving sensor includes a receiving coil and a second magnetizer.

[0027] Furthermore, the working parameters set in the portable control terminal include the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope; the number of sinusoidal waveform signal pulses is used to confirm the waveguide excitation frequency, and the diameter of the parallel steel wire rope is used to match the corresponding parallel steel wire rope dispersion curve.

[0028] A detection method of a magnetostrictive torsional guided wave detection system for a broken wire defect of a parallel steel wire rope as described above, the specific steps are as follows:

[0029] S1, the portable control terminal accepts the working parameters set by the user and transmits the working parameters set by the user to the torsional waveguide control device;

[0030] S2, the torsional waveguide control device obtains the excitation frequency and propagation speed of the torsional waveguide according to the working parameters set by the user, converts the excitation frequency of the torsional waveguide into a waveguide excitation signal and distributes it to the torsional waveguide excitation sensor;

[0031] S3, the torsional waveguide excitation sensor excites the torsional waveguide on the parallel steel wire rope to obtain the torsional waveguide excitation signal, and detects the parallel steel wire rope; the torsional waveguide propagates on the parallel steel wire rope to generate a torsional waveguide echo signal, and the torsional waveguide echo signal is received by the torsional waveguide receiving sensor and transmitted to the torsional waveguide control device for processing;

[0032] S4, performing amplitude difference calculation on the torsional waveguide echo signal and the torsional waveguide excitation signal after data processing to obtain the amplitude difference between the two signals; judging whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor is an echo signal of a broken wire defect of the parallel steel wire rope;

[0033] S5, based on the determination in step S4 that the torsional waveguide echo signal obtained is a broken wire defect echo signal, the number of broken wire defects is counted, and the difference between the time of the torsional waveguide excitation signal and the time of the received broken wire defect echo signal during the detection process is multiplied by the propagation speed of the torsional waveguide to obtain the distance from the broken wire defect to the arrangement point of the torsional waveguide excitation sensor and the arrangement point of the torsional waveguide receiving sensor, and locate the specific position of the broken wire defect in the parallel steel wire rope;

[0034] S6, displaying the number of broken wire defects of the parallel steel wire rope obtained in step S5 and the specific positions of the broken wire defects on the portable control terminal.

[0035] Furthermore, in step S4: when the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is greater than or equal to 1, it means that the torsional waveguide echo signal belongs to a broken wire defect echo signal; when the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is less than 1, it means that the torsional waveguide echo signal belongs to a non-broken wire defect echo signal.

[0036] The present invention has the following beneficial effects:

[0037] 1. Based on the torsional magnetostrictive effect and the mechanism of torsional wave propagation in parallel steel wires, the present invention installs a torsional wave excitation sensor and a torsional wave receiving sensor on the surface of the parallel steel wires to excite torsional wave of a specified frequency in the parallel steel wires to detect the parallel steel wires. The operation method is convenient and easy to implement, and does not cause secondary damage to the parallel steel wires, thereby ensuring the integrity of the parallel steel wire structure.

[0038] 2. The present invention can detect the broken wire defect of the steel wire rope more conveniently and accurately by accurately distinguishing the torsional waveguide echo signal of the broken wire defect from the rust and relaxation defect, and determine the specific position of the broken wire defect in the parallel steel wire rope. By displaying the detection results on the display screen of the portable control terminal, the position of the broken wire defect inside the steel wire rope can be found in time and accurately, preventing the broken wire defect from further developing, and ensuring the structural safety of the parallel steel wire rope.

[0039] 3. Compared with the traditional manual detection method, the present invention avoids secondary damage to the parallel wire rope structure through non-destructive detection method, ensures the integrity of the parallel wire rope structure, improves the work efficiency of the detection personnel, effectively reduces the human resources and time costs required in the detection process, and has good benefits.

[0040] 4. The present invention can provide effective protection for the operational safety of in-service parallel steel wire cables, provide accurate data support for the maintenance and replacement of parallel steel wire cables, and avoid the serious consequences of bridge collapse caused by broken wire defects of parallel steel wire cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 A structural diagram of a torsional waveguide control device in the present invention;

[0043] Figure 3 Schematic diagram of the implementation steps of the detection method of the present invention;

[0044] Figure 4 It is a schematic diagram of an embodiment of the present invention.

[0045] Among them: 1. Portable control terminal; 2. Torsional waveguide control equipment; 3. Torsional waveguide excitation sensor; 4. Torsional waveguide receiving sensor; 5. Parallel steel wire rope; 6. Broken wire defect; 7. Non-broken wire defect; 8. Broken wire defect echo signal; 9. Non-broken wire defect echo signal. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0047] Reference Figure 1-3 In this embodiment, a magnetostrictive torsional waveguide detection system for broken wire defects in parallel steel wire ropes includes: a portable control terminal 1, a torsional waveguide control device 2, and a torsional waveguide excitation sensor 3 and a torsional waveguide receiving sensor 4 installed at intervals on the parallel steel wire ropes 5.

[0048] Specifically, the portable control terminal 1, the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 are respectively connected to the torsional waveguide control device 2 by wire. The portable control terminal 1 is a portable computer, which includes an operating system and operating software for controlling the detection process, and is used to control the opening and closing of the system, and the operation and termination of the detection process. The working parameters set in the portable control terminal 1 include the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5; the number of sinusoidal waveform signal pulses is used to confirm the waveguide excitation frequency, and the diameter of the parallel steel wire rope 5 is used to match the corresponding parallel steel wire rope 5 dispersion curve, select the corresponding excitation frequency and generate a frequency selection signal.

[0049] The portable control terminal 1 is used to set working parameters, transmit the set working parameters to the torsional waveguide control device 2, and display the broken wire defect 6 information of the parallel steel wire rope 5. Specifically, the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5 input by the user at the portable control terminal 1.

[0050] Specifically, the torsional waveguide excitation sensor 3 is used to excite the torsional waveguide on the parallel steel wire rope 5 to detect the parallel steel wire rope 5; the torsional waveguide excitation sensor 3 includes an excitation coil and a first magnetizer. Preferably, the excitation coil is a copper wire with 10 turns and a diameter of 0.5 mm, and the first magnetizer is two electromagnets, and the distance between the two electromagnets is 20 cm.

[0051] Specifically, the torsional waveguide receiving sensor 4 is used to receive and transmit the torsional waveguide echo signal generated when the torsional waveguide propagates on the parallel steel wire 5; the torsional waveguide receiving sensor 4 includes a receiving coil and a second magnetizer. Preferably, the receiving coil is a copper wire with 40 turns and a diameter of 0.5 mm, and the second magnetizer is two electromagnets, and the distance between the two electromagnets is 20 cm.

[0052] Specifically, the torsional waveguide control device 2 is used to generate a waveguide excitation signal and distribute it to the torsional waveguide excitation sensor 3, receive and process the torsional waveguide echo signal, determine whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor 4 is a broken wire defect echo signal 8 of the parallel steel wire rope 5, and locate the specific position of the broken wire defect 6 in the parallel steel wire rope 5. The torsional waveguide control device 2 can be connected to the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 at the same time to form a sensor detection control network.

[0053] The present invention is based on the torsional magnetostrictive effect and the mechanism of torsional wave propagation in the parallel steel wire rope 5. By installing a torsional wave excitation sensor 3 and a torsional wave receiving sensor 4 on the surface of the parallel steel wire rope 5, torsional wave of a specified frequency is excited in the parallel steel wire rope 5 to detect the parallel steel wire rope. The operation method is convenient and easy to implement, and no secondary damage is caused to the parallel steel wire rope 5, thereby ensuring the structural integrity of the parallel steel wire rope 5.

[0054] In this embodiment, the torsional waveguide control device 2 includes a central processing module, a waveguide excitation module, a sensor connection module and a waveguide receiving module; the central processing module is connected to the waveguide excitation module and the waveguide receiving module respectively, and the sensor connection module is connected to the waveguide receiving module and the waveguide excitation module respectively;

[0055] Specifically, the central processing module is used to analyze and process the torsional guided wave echo signal and transmit it to the portable control terminal 1 and send a frequency selection signal to the guided wave excitation module. The central processing module is a master control circuit, which is used to receive and process instructions from the portable control terminal 1. Specifically, the central processing module matches the dispersion curve of the wire rope torsional mode guided wave according to the number of sinusoidal waveform signal pulses input by the user and the diameter of the parallel wire rope 5, selects the corresponding excitation frequency and generates a frequency selection signal.

[0056] Specifically, the waveguide excitation module is used to receive a frequency selection signal to generate a waveguide excitation signal, and transmit the waveguide excitation signal to the sensor connection module; the waveguide excitation module is a programmable sinusoidal wave signal generating circuit, and the sinusoidal wave signal generating circuit includes a power amplifier and a transformer.

[0057] Specifically, the sensor connection module is used to send a pulse electrical signal, transmit the waveguide excitation signal to the torsional waveguide excitation sensor 3, and transmit the torsional waveguide echo signal received by the torsional waveguide receiving sensor 4 to the waveguide receiving module; the sensor connection module is a programmable sine wave signal distribution circuit, and the sine wave signal distribution circuit includes a counter and a single-chip microcomputer. The pulse electrical signal is used to control the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 to work together.

[0058] Preferably, the sensor connection module ensures that the torsional waveguide excitation sensor 3 interconnected with the sensor connection module is in a normal working state of the excitation waveguide, and ensures that the torsional waveguide receiving sensor 4 interconnected with the sensor connection module is in a normal working state of the receiving waveguide by sending a pulse electrical signal to the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4.

[0059] Specifically, the waveguide receiving module is used to digitize the torsional waveguide echo signal after amplification and filtering steps and transmit it to the central processing module; the waveguide receiving module is a combination circuit including an acquisition and pre-amplification circuit and an analog filtering circuit, and the combination circuit includes a source filter, a signal amplifier and a filtering element.

[0060] The present invention can accurately distinguish the torsional guided wave echo signals of the broken wire defect 6 from those of the rust and relaxation defects, thereby more conveniently realizing accurate detection of the broken wire defect 6 of the steel wire rope and determining the specific position of the broken wire defect 6 in the parallel steel wire rope 5. By displaying the detection result on the display screen of the portable control terminal 1, the position of the broken wire defect 6 inside the steel wire rope can be found in time and accurately, and the further development of the broken wire defect 6 can be prevented, thereby ensuring the structural safety of the parallel steel wire rope 5.

[0061] Compared with the traditional manual detection method, the present invention avoids secondary damage to the parallel steel wire rope 5 structure through a non-destructive detection method, ensures the integrity of the parallel steel wire rope 5 structure, improves the work efficiency of the detection personnel, effectively reduces the human resources and time costs required in the detection process, and has good benefits.

[0062] The present invention can provide effective protection for the operational safety of the in-service parallel steel wire cables 5 , provide accurate data support for the maintenance and replacement of the parallel steel wire cables 5 , and avoid the serious consequences of bridge collapse caused by the broken wire defects 6 of the parallel steel wire cables 5 .

[0063] Combination Figure 1-3 The present invention provides a detection method of a magnetostrictive torsional guided wave detection system for a broken wire defect of a parallel steel wire rope, and the specific steps are as follows:

[0064] S1, the portable control terminal 1 accepts the working parameters set by the user, and transmits the working parameters set by the user to the torsional waveguide control device 2. The working parameters set in the portable control terminal 1 include the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5.

[0065] S2, the central processing module of the torsional waveguide control device 2 obtains the excitation frequency and propagation speed of the torsional waveguide from the dispersion curve database of the parallel steel wire rope 5 according to the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5 in the user-set working parameters, converts the excitation frequency of the torsional waveguide into a frequency selection signal and sends it to the waveguide excitation module. The waveguide excitation module generates an excitation signal of a corresponding frequency according to the frequency selection signal; the sensor connection module distributes the excitation signal generated by the waveguide excitation module to the torsional waveguide excitation sensor 3 according to the electrical signal.

[0066] S3, the torsional waveguide excitation sensor 3 excites the torsional waveguide on the parallel steel wire rope 5 to detect the parallel steel wire rope 5. The torsional waveguide propagates on the parallel steel wire rope 5 and generates a torsional waveguide echo signal, which is received by the torsional waveguide receiving sensor 4 and transmitted to the waveguide receiving module via the sensor connection module of the torsional waveguide control device 2. The torsional waveguide echo signal is transmitted to the central processing module of the torsional waveguide control device 2 after undergoing the digital steps of amplification and filtering in the waveguide receiving module.

[0067] S4, the central processing module performs waveguide signal data processing on the digitized torsional waveguide echo signal obtained in step S3 after amplification and filtering steps and the torsional waveguide excitation signal sent in step S2.

[0068] S5, performing amplitude difference calculation on the torsional waveguide echo signal and the torsional waveguide excitation signal after data processing to obtain the amplitude difference between the two signals.

[0069] S6, judging whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor 4 is the broken wire defect echo signal 8 of the parallel steel wire rope 5. When the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is greater than or equal to 1, it means that the torsional waveguide echo signal belongs to the broken wire defect echo signal 8 of the parallel steel wire rope 5; when the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is less than 1, it means that the torsional waveguide echo signal belongs to the non-broken wire defect echo signal 9.

[0070] S7, based on the determination in step S6 that the torsional guided wave echo signal obtained is a broken wire defect echo signal 8, the number of broken wire defects 6 is counted. The time difference between the torsional guided wave excitation signal and the received broken wire defect echo signal 8 during the detection process is multiplied by the propagation speed of the torsional guided wave to obtain the distance from the broken wire defect 6 to the excitation sensor arrangement point and the receiving sensor arrangement point, and locate the specific position of the broken wire defect 6 on the parallel steel wire rope 5.

[0071] S8, displaying the number of broken wire defects 6 of the parallel steel wire rope 5 obtained in step S7 and the specific positions of the broken wire defects 6 on the portable control terminal 1.

[0072] like Figure 4 As shown, in one embodiment of the present invention, a portable control terminal 1, a torsional waveguide control device 2, a torsional waveguide excitation sensor 3 and a torsional waveguide receiving sensor 4 are included. The portable control terminal 1 is connected to the torsional waveguide control device 2, the torsional waveguide control device 2 is connected to the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4, and the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 are respectively installed on the surface of the parallel steel wire 5 at intervals.

[0073] First, the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 are respectively arranged on the parallel steel wire rope 5; the torsional waveguide control device 2 and the portable control terminal 1 are mutually connected through a cable; the torsional waveguide excitation sensor 3 and the torsional waveguide receiving sensor 4 are respectively mutually connected with the torsional waveguide control device 2 through a cable.

[0074] The user inputs working parameters on the portable control terminal 1, and the input working parameters include the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5. The portable control terminal 1 transmits the number of sinusoidal waveform signal pulses and the diameter parameters of the parallel steel wire rope 5 input by the user to the central processing module of the torsional waveguide control device 2.

[0075] The central processing module of the torsional waveguide control device 2 matches the pre-stored dispersion curve of the parallel steel wire rope 5 in the module according to the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope 5, and matches the corresponding torsional waveguide excitation frequency and waveguide propagation speed. The central processing module generates a corresponding frequency selection signal according to the torsional waveguide excitation frequency and transmits it to the waveguide excitation module.

[0076] The waveguide excitation module generates a waveguide excitation signal according to the frequency selection signal transmitted by the central processing module and transmits it to the sensor connection module. The sensor connection module transmits the waveguide excitation signal transmitted by the waveguide excitation module to the connected torsion waveguide excitation sensor 3 through a synchronous pulse. At the same time, the sensor connection module generates a pulse electrical signal and establishes a sensor management network with the torsion waveguide excitation sensor 3 and the torsion waveguide receiving sensor 4 to ensure that the torsion waveguide excitation sensor 3 is in the state of exciting the waveguide and the torsion waveguide receiving sensor 4 is in the normal working state of receiving the waveguide.

[0077] The torsional waveguide excitation sensor 3 generates torsional waveguides in the parallel steel wire rope 5, and generates torsional waveguide echo signals after encountering broken wire defects 6 and non-broken wire defects 7. After receiving the torsional waveguide echo signals, the torsional waveguide receiving sensor 4 transmits them to the waveguide receiving module through the sensor connection module of the torsional waveguide control device 2, and undergoes digital processing processes such as amplification and filtering in the waveguide receiving module. The digitally processed signals are then transmitted to the central processing module.

[0078] The central processing module processes the torsional waveguide echo signal and the torsional waveguide excitation signal, calculates the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal, and discriminates the torsional waveguide echo signal according to the calculation result. If the amplitude difference between the torsional waveguide excitation signal and the torsional waveguide echo signal is greater than or equal to 1, it means that the torsional waveguide echo signal is a broken wire defect echo signal 8; if the amplitude difference between the torsional waveguide excitation signal and the torsional waveguide echo signal is less than 1, it means that the torsional waveguide echo signal is a non-broken wire defect echo signal 9. Among them, the broken wire defect echo signal 8 is an echo signal with a broken wire area greater than or equal to 5% of the cross-sectional area of ​​the parallel steel wire rope 5.

[0079] On the basis of judging that the torsional waveguide echo signal is the broken wire defect echo signal 8, the central processing module counts the number of broken wire defect echo signals 8 that meet the conditions, multiplies the time difference between the torsional waveguide excitation signal and the received broken wire defect echo signal 8 during the detection process by the propagation speed of the torsional waveguide, and obtains the distance from the broken wire defect 6 to the arrangement point of the torsional waveguide excitation sensor 3 and the arrangement point of the torsional waveguide receiving sensor 4, thereby locating the specific position of the broken wire defect 6 in the parallel steel wire rope 5.

[0080] Finally, the central processing module of the torsional waveguide control device 2 transmits the number of broken wire defects 6 in the parallel steel wire rope 5 and the specific location information of the broken wire defects 6 to the display screen of the portable control terminal 1.

[0081] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A magnetostrictive torsional waveguide detection system for broken wire defects in parallel steel wire ropes, characterized in that: include: A portable control terminal, a torsional waveguide control device, and a torsional waveguide excitation sensor and a torsional waveguide receiving sensor installed at intervals on parallel steel wires; The portable control terminal, the torsional waveguide excitation sensor and the torsional waveguide receiving sensor are respectively connected to the torsional waveguide control device by wire; Wherein, the portable control terminal is used to set working parameters, transmit the set working parameters to the torsional waveguide control device, and display the broken wire defect information of the parallel steel wire rope; The torsional guided wave excitation sensor is used to excite the torsional guided wave on the parallel steel wire ropes to detect the parallel steel wire ropes; The torsional guided wave receiving sensor is used to receive and transmit the torsional guided wave echo signal generated when the torsional guided wave propagates on the parallel steel wire rope; The torsional waveguide control device is used to generate a waveguide excitation signal and distribute it to the torsional waveguide excitation sensor, receive and process the torsional waveguide echo signal, determine whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor is a broken wire defect echo signal of the parallel steel wire rope, and locate the specific position of the broken wire defect in the parallel steel wire rope.

2. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 1 is characterized in that: The torsional waveguide control device includes a central processing module, a waveguide excitation module, a sensor connection module and a waveguide receiving module; The central processing module is connected to the waveguide excitation module and the waveguide receiving module respectively, and the sensor connection module is connected to the waveguide receiving module and the waveguide excitation module respectively; The central processing module is used to analyze and process the torsional waveguide echo signal and transmit it to the portable control terminal and send a frequency selection signal to the waveguide excitation module; The waveguide excitation module is used to receive the frequency selection signal to generate a waveguide excitation signal, and transmit the waveguide excitation signal to the sensor connection module; The sensor connection module is used to send a pulse electrical signal, transmit the waveguide excitation signal to the torsional waveguide excitation sensor, and transmit the torsional waveguide echo signal received by the torsional waveguide receiving sensor to the waveguide receiving module; The waveguide receiving module is used to digitize the torsional waveguide echo signal after amplification and filtering steps and transmit it to the central processing module; The pulse electrical signal is used to control the torsional waveguide excitation sensor and the torsional waveguide receiving sensor to work in coordination.

3. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 2 is characterized in that: The central processing module is a master control circuit used for receiving and processing instructions from the portable control terminal.

4. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 2, characterized in that: The waveguide excitation module is a programmable sine wave signal generating circuit, and the sine wave signal generating circuit includes a power amplifier and a transformer.

5. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 2, characterized in that: The waveguide receiving module is a combination circuit including an acquisition and preamplification circuit and an analog filtering circuit, and the combination circuit includes a source filter, a signal amplifier and a filtering element.

6. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 2, characterized in that: The sensor connection module is a programmable sine wave signal distribution circuit, and the sine wave signal distribution circuit includes a counter and a single chip microcomputer.

7. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 1, characterized in that: The torsional guided wave excitation sensor includes an excitation coil and a first magnetizer; the torsional guided wave receiving sensor includes a receiving coil and a second magnetizer.

8. The magnetostrictive torsional waveguide detection system for broken wire defects of parallel steel wire ropes according to claim 1, characterized in that: The working parameters set in the portable control terminal include the number of sinusoidal waveform signal pulses and the diameter of the parallel steel wire rope; the number of sinusoidal waveform signal pulses is used to confirm the waveguide excitation frequency, and the diameter of the parallel steel wire rope is used to match the corresponding parallel steel wire rope dispersion curve.

9. A detection method of a magnetostrictive torsional guided wave detection system for a broken wire defect of a parallel steel wire rope as claimed in any one of claims 1 to 8, characterized in that: The specific steps are as follows: S1, the portable control terminal accepts the working parameters set by the user and transmits the working parameters set by the user to the torsional waveguide control device; S2, the torsional waveguide control device obtains the excitation frequency and propagation speed of the torsional waveguide according to the working parameters set by the user, converts the excitation frequency of the torsional waveguide into a waveguide excitation signal and distributes it to the torsional waveguide excitation sensor; S3, the torsional waveguide excitation sensor excites the torsional waveguide on the parallel steel wire rope to obtain the torsional waveguide excitation signal, and detects the parallel steel wire rope; the torsional waveguide propagates on the parallel steel wire rope to generate a torsional waveguide echo signal, and the torsional waveguide echo signal is received by the torsional waveguide receiving sensor and transmitted to the torsional waveguide control device for processing; S4, performing amplitude difference calculation on the torsional waveguide echo signal and the torsional waveguide excitation signal after data processing to obtain the amplitude difference between the two signals; judging whether the torsional waveguide echo signal obtained by the torsional waveguide receiving sensor is an echo signal of a broken wire defect of the parallel steel wire rope; S5, based on the determination in step S4 that the torsional waveguide echo signal obtained is a broken wire defect echo signal, the number of broken wire defects is counted, and the difference between the time of the torsional waveguide excitation signal and the time of the received broken wire defect echo signal during the detection process is multiplied by the propagation speed of the torsional waveguide to obtain the distance from the broken wire defect to the arrangement point of the torsional waveguide excitation sensor and the arrangement point of the torsional waveguide receiving sensor, and locate the specific position of the broken wire defect in the parallel steel wire rope; S6, displaying the number of broken wire defects of the parallel steel wire rope obtained in step S5 and the specific positions of the broken wire defects on the portable control terminal.

10. The detection method of the magnetostrictive torsional guided wave detection system for the broken wire defect of parallel steel wire rope according to claim 9, characterized in that: In step S4: When the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is greater than or equal to 1, it means that the torsional waveguide echo signal belongs to a broken wire defect echo signal; when the amplitude difference between the torsional waveguide echo signal and the torsional waveguide excitation signal is less than 1, it means that the torsional waveguide echo signal belongs to a non-broken wire defect echo signal.

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