Anchor rod length detection method and system, electronic equipment and storage medium

Abstract

The invention is suitable for the technical field of anchor rod length measurement, and provides an anchor rod length detection method and system, electronic equipment and a storage medium. The method comprises the steps that when the anchor rod is tensioned, the time difference of acoustic emission signals, detected by a first acoustic emission sensor and a second acoustic emission sensor, of the first end of the anchor rod is obtained; and determining the length of the anchor rod according to the time difference and a distance geometrical relationship model of the first acoustic emission sensor, the second acoustic emission sensor, the first end and the second end. The length of the anchor rod can be accurately and efficiently detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of anchor rod length measurement, and in particular relates to an anchor rod length detection method, system, electronic equipment and storage medium. Background Art

[0002] Anchor rods are tensile components that are widely used in modern engineering construction. Due to their simple structure, convenient construction, low cost and strong adaptability, they are widely used in mine tunnels, slope reinforcement, tunnels, water conservancy dams, engineering construction, etc.

[0003] However, in recent years, there have been many cases of cutting corners in the construction of anchor rods, where the length does not meet the design requirements. Due to the insufficient length of the anchor rods, the anchoring force does not meet the design requirements, resulting in a series of problems such as slope collapse and structural damage to buildings. Anchor rod length detection has become one of the must-check items for project acceptance. Accurate and efficient detection of anchor rod length is of great significance to the control of project construction quality. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides an anchor rod length detection method, system, electronic device and storage medium to accurately and efficiently detect the anchor rod length.

[0005] A first aspect of an embodiment of the present invention provides a method for detecting anchor rod length, comprising:

[0006] When obtaining the tensioned anchor rod, the first acoustic emission sensor and the second acoustic emission sensor detect the time difference of the acoustic emission signal of the first end of the anchor rod; wherein the first acoustic emission sensor and the second acoustic emission sensor are arranged on a target plane, the target plane is a plane perpendicular to the anchor rod where the second end of the anchor rod is located, and the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end;

[0007] The length of the anchor rod is determined according to the time difference and a distance geometric relationship model among the first acoustic emission sensor, the second acoustic emission sensor, the first end and the second end.

[0008] In combination with the first aspect, in a possible implementation of the first aspect, when obtaining the tension anchor, the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor includes:

[0009] Obtaining the times of multiple acoustic emission signals detected by the first acoustic emission sensor, and taking the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the first time;

[0010] Obtaining the times of multiple acoustic emission signals detected by the second acoustic emission sensor, and taking the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the second time;

[0011] The difference between the first time and the second time is calculated to obtain the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod.

[0012] In combination with the first aspect, in a possible implementation manner of the first aspect, the distance geometric relationship model is:

[0013]

[0014] Wherein, a is the length of the anchor rod, b is the distance between the first acoustic emission sensor and the second end, c is the distance between the second acoustic emission sensor and the second end, v is the preset sound velocity, and Δt is the time difference.

[0015] In combination with the first aspect, in a possible implementation manner of the first aspect, the preset sound speed is determined by measuring the material medium in which the anchor rod is located.

[0016] In combination with the first aspect, in a possible implementation of the first aspect, before acquiring the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod, the method further includes:

[0017] Determine whether the number of acoustic emission signals detected by the first acoustic emission sensor is equal to the number of acoustic emission signals detected by the second acoustic emission sensor when the anchor is tensioned;

[0018] If not, the anchor rod is re-tensioned, and the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod is obtained.

[0019] In combination with the first aspect, in a possible implementation of the first aspect, after determining the length of the anchor rod, the method further includes:

[0020] Repeat the measurement of anchor length several times and delete the outliers.

[0021] The average of the remaining lengths is calculated and taken as the final length of the anchor.

[0022] A second aspect of an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method in the first aspect or any one of the implementations of the first aspect are implemented.

[0023] A third aspect of an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method in the first aspect or any one of the implementations of the first aspect are implemented.

[0024] A fourth aspect of the embodiments of the present invention provides an anchor length detection system, comprising: a first acoustic emission sensor, a second acoustic emission sensor, an acoustic emission instrument, and the electronic device of the second aspect;

[0025] The first acoustic emission sensor and the second acoustic emission sensor are used to be arranged on the target plane and connected to the acoustic emission instrument; the acoustic emission instrument is connected to the electronic equipment.

[0026] In combination with the fourth aspect, in a possible implementation of the fourth aspect, the first acoustic emission sensor and the second acoustic emission sensor are disposed on a planar structure through a slide groove, and the first acoustic emission sensor and the second acoustic emission sensor can both move along the slide groove.

[0027] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0028] The embodiment of the present invention forms a distance geometric relationship model by setting a first acoustic emission sensor and a second acoustic emission sensor on a plane perpendicular to the anchor rod where the second end of the anchor rod is located, and the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end. The model can calculate the distance geometric relationship between the first acoustic emission sensor, the second acoustic emission sensor, the first end, and the second end, and the length of the anchor rod can be determined by combining the time difference of the acoustic emission signal detected by the first acoustic emission sensor and the second acoustic emission sensor at the first end of the anchor rod, and the propagation speed of the acoustic emission signal. The operation method of the present invention is simple and convenient, low in cost, and can accurately and efficiently detect the length of the anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic diagram of the implementation process of the anchor rod length detection method provided by an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of an application scenario of the anchor rod length detection method provided by an embodiment of the present invention;

[0032] Figure 3 The structure of the anchor rod length detection system provided by the embodiment of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 4 The structure of the anchor rod length detection system provided by the embodiment of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 5 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0036] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0037] At present, the main methods for measuring anchor rod length at home and abroad include pull-out test method and ultrasonic method. The pull-out test method mostly stays at the stage of mechanical destructive pull-out test with jack, which will cause serious damage to the anchor structure and reduce the reinforcement effect of the anchor rod on the surrounding rock. Therefore, only a small number of spot checks can be carried out. The ultrasonic method can realize non-destructive testing of anchor rod length, couple ultrasonic waves into the rod body, and then analyze the reflection phase characteristics and energy attenuation change law of acoustic stress waves in the anchoring system. However, ultrasonic waves are severely attenuated in the anchor rod, and usually can only be used to detect anchor rods within 3 meters. The requirements for the measurement end of the anchor rod are also strict. The end of the anchor rod needs to be polished and smoothed on site before the ultrasonic wave can be coupled into the rod body.

[0038] To this end, an embodiment of the present invention proposes a simpler and more convenient method for detecting the length of an anchor rod.

[0039] Figure 1 is a flow chart of the anchor rod length detection method proposed in the embodiment of the present invention, see Figure 1 As shown, the method includes:

[0040] Step S101, obtaining the time difference between the acoustic emission signals of the first end of the anchor rod detected by the first acoustic emission sensor and the second acoustic emission sensor when the anchor rod is tensioned.

[0041] The function of the acoustic emission sensor is to receive the acoustic emission signal inside the material or structure, and also to bridge the structure with the acoustic emission instrument. Figure 2As shown, the first acoustic emission sensor and the second acoustic emission sensor are arranged on a target plane, and the target plane is a plane perpendicular to the anchor rod where the second end of the anchor rod is located, and the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end. Here, the first end is the end of the anchor rod driven into the rock mass or the interior of the building, and the second end is the end of the anchor rod exposed to the outside, that is, the tensioned anchoring end. By tensioning the anchor rod by the tensioned anchoring end, an acoustic emission phenomenon will occur at the first end of the anchor rod to form a sound source. Since the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end of the anchor rod, the two sensors are also at different distances from the first end of the anchor rod, so there will be a time difference in the time of receiving the acoustic emission signal of the first end of the anchor rod.

[0042] Step S102, determining the length of the anchor rod according to the time difference and the distance geometric relationship model among the first acoustic emission sensor, the second acoustic emission sensor, the first end and the second end.

[0043] See also Figure 2 As shown, assuming that the length of the anchor rod is a, the distance between the first acoustic emission sensor and the second end of the anchor rod is b, and the distance between the second acoustic emission sensor and the second end of the anchor rod is c.

[0044] According to the geometric relationship, it can be concluded that:

[0045] The distance between the first acoustic emission sensor and the first end of the anchor

[0046] The distance between the second acoustic emission sensor and the first end of the anchor

[0047] The length a of the anchor rod can be calculated according to the following formula:

[0048]

[0049] Wherein, a is the length of the anchor rod, b is the distance between the first acoustic emission sensor and the second end, c is the distance between the second acoustic emission sensor and the second end, v is the preset sound velocity, and Δt is the time difference.

[0050] Considering that the propagation speed of the acoustic emission signal in different media is different, the preset sound speed here can be determined by measuring the material medium in which the anchor rod is located.

[0051] Specifically, the propagation speed of the acoustic emission signal in the current medium may be actually measured. Alternatively, after the current medium is determined, the propagation speed of the acoustic emission signal in the current medium may be determined by consulting a pre-stored database. This embodiment does not limit this.

[0052] The embodiment of the present invention forms a distance geometric relationship model by setting a first acoustic emission sensor and a second acoustic emission sensor on a plane perpendicular to the anchor rod where the second end of the anchor rod is located, and the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end. The model can calculate the distance geometric relationship between the first acoustic emission sensor, the second acoustic emission sensor, the first end, and the second end, and the length of the anchor rod can be determined by combining the time difference of the acoustic emission signal detected by the first acoustic emission sensor and the second acoustic emission sensor at the first end of the anchor rod, and the propagation speed of the acoustic emission signal. The operation method of the present invention is simple and convenient, low in cost, and can accurately and efficiently detect the length of the anchor rod.

[0053] Generally, when the anchor is tensioned, acoustic emission will occur not only at the first end of the anchor, but also at multiple sound sources along the length of the anchor. Therefore, it is also necessary to determine which is the first end of the anchor.

[0054] In one embodiment, when obtaining the tension anchor, the time difference between the first acoustic emission sensor and the second acoustic emission sensor detecting the acoustic emission signal of the first end of the anchor includes:

[0055] Obtaining the times of multiple acoustic emission signals detected by the first acoustic emission sensor, and taking the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the first time;

[0056] Obtaining the times of multiple acoustic emission signals detected by the second acoustic emission sensor, and taking the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the second time;

[0057] The difference between the first time and the second time is calculated to obtain the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod.

[0058] It can be understood that when the first acoustic emission sensor detects the acoustic emission signals of multiple sound source points, because the first end of the anchor rod is farthest from the first acoustic emission sensor, its acoustic emission signal is detected by the first acoustic emission sensor at the latest. Similarly, when the second acoustic emission sensor detects the acoustic emission signals of multiple sound source points, because the first end of the anchor rod is farthest from the second acoustic emission sensor, its acoustic emission signal is detected by the second acoustic emission sensor at the latest. In this way, the acoustic emission signal of the first end of the anchor rod can be found.

[0059] In addition, considering the error of the sensor, in one embodiment, before obtaining the time difference between the first acoustic emission sensor and the second acoustic emission sensor detecting the acoustic emission signal of the first end of the anchor rod, the following steps may also be included:

[0060] Determine whether the number of acoustic emission signals detected by the first acoustic emission sensor is equal to the number of acoustic emission signals detected by the second acoustic emission sensor when the anchor is tensioned;

[0061] If not, the anchor rod is re-tensioned, and the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod is obtained.

[0062] It is understandable that the number of acoustic emission signals detected by the first acoustic emission sensor should be equal to the number of acoustic emission signals detected by the second acoustic emission sensor. If not, there may be a problem with the data, and this set of data is not used to calculate the anchor length, and the anchor is re-tensioned for calculation.

[0063] In one embodiment, after determining the length of the anchor rod, the following steps may be further performed:

[0064] Repeat the measurement of anchor length several times and delete the outliers.

[0065] The average of the remaining lengths is calculated and taken as the final length of the anchor.

[0066] In this embodiment, the length of the anchor rod is measured multiple times, and the calculation accuracy is improved and the error is reduced by deleting abnormal values ​​and calculating the average value.

[0067] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0068] Figure 3 is a schematic diagram of the structure of the anchor rod length detection system proposed in an embodiment of the present invention, see Figure 3 As shown, the system includes: a first acoustic emission sensor, a second acoustic emission sensor, a two-channel acoustic emission instrument and an electronic device (the electronic device here can be a host computer or a single-chip microcomputer, and the single-chip microcomputer can be directly integrated into the acoustic emission instrument).

[0069] The first acoustic emission sensor and the second acoustic emission sensor are used to be arranged on the target plane and connected to the acoustic emission instrument through a wire via a signal amplifier. The acoustic emission instrument can be connected to an electronic device, and the electronic device performs calculations. Alternatively, a single chip microcomputer can be integrated in the acoustic emission instrument to perform calculations.

[0070] The process of using this system for measurement is as follows:

[0071] (1) First, follow Figure 2 Two acoustic emission sensors are arranged at the positions shown, and the acoustic emission sensors are connected to the acoustic emission instrument.

[0072] (2) Set the distance between the two acoustic emission sensors and the second end of the anchor rod.

[0073] (3) Set the relevant parameters of the acoustic emission instrument, input the acoustic emission signal propagation speed (measured value), turn on the acoustic emission instrument and tension the anchor rod.

[0074] (4) The acoustic emission instrument substitutes the time difference Δt between the acoustic emission signal at the first end of the anchor rod and the two sensors into the distance geometric relationship model to solve and obtain the anchor rod length.

[0075] Here, in order to more conveniently arrange the acoustic emission sensor, this embodiment is designed as follows Figure 4 In the planar structure shown, the first acoustic emission sensor and the second acoustic emission sensor are arranged on a slideway of the planar structure, and both the first acoustic emission sensor and the second acoustic emission sensor can move along the slideway.

[0076] Therefore, the target plane can be formed by placing the plane structure close to the second end of the anchor rod and perpendicular to the anchor rod, and the two acoustic emission sensors can move on the slideway to adjust the distance at any time according to the needs. The slideway here can be in any direction on the plane, and this embodiment is not limited.

[0077] Figure 5 FIG. 5 is a schematic diagram of an electronic device 50 provided in an embodiment of the present invention. Figure 5 As shown, the electronic device 50 of this embodiment includes: a processor 51, a memory 52, and a computer program 53 stored in the memory 52 and executable on the processor 51, such as an anchor rod length detection program. When the processor 51 executes the computer program 53, the steps in the above-mentioned various anchor rod length detection method embodiments are implemented, such as Figure 1 Steps S101 to S102 are shown.

[0078] Alternatively, the computer program 53 may be divided into one or more modules / units, one or more modules / units are stored in the memory 52, and executed by the processor 51 to implement the present invention. One or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 53 in the electronic device 50.

[0079] For example, the computer program 53 may be divided into an acquisition module and a calculation module (modules in the virtual device), and the specific functions of each module are as follows:

[0080] The acquisition module is used to acquire the time difference between the acoustic emission signal detected by the first acoustic emission sensor and the acoustic emission signal detected by the second acoustic emission sensor at the first end of the anchor rod when the anchor rod is tensioned.

[0081] The calculation module is used to determine the length of the anchor rod according to the time difference and the distance geometric relationship model among the first acoustic emission sensor, the second acoustic emission sensor, the first end and the second end.

[0082] The electronic device 50 may be a computing device such as a desktop computer, a single-chip microcomputer, or a cloud server. The electronic device 50 may include, but is not limited to, a processor 51 and a memory 52. ​​Those skilled in the art will appreciate that Figure 5 It is only an example of the electronic device 50 and does not constitute a limitation of the electronic device 50. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 50 may also include input and output devices, network access devices, buses, etc.

[0083] The processor 51 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0084] The memory 52 may be an internal storage unit of the electronic device 50, such as a hard disk or memory of the electronic device 50. The memory 52 may also be an external storage device of the electronic device 50, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 50. Further, the memory 52 may also include both an internal storage unit of the electronic device 50 and an external storage device. The memory 52 is used to store computer programs and other programs and data required by the electronic device 50. The memory 52 may also be used to temporarily store data that has been output or is to be output.

[0085] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0088] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0089] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0090] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0091] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media can include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for detecting anchor rod length, characterized in that: include: When acquiring the tensioned anchor rod, the first acoustic emission sensor and the second acoustic emission sensor detect the time difference of the acoustic emission signal of the first end of the anchor rod; wherein the first acoustic emission sensor and the second acoustic emission sensor are arranged on a target plane, the target plane is a plane perpendicular to the anchor rod where the second end of the anchor rod is located, and the first acoustic emission sensor and the second acoustic emission sensor are at different distances from the second end; The length of the anchor rod is determined according to the time difference and a distance geometric relationship model among the first acoustic emission sensor, the second acoustic emission sensor, the first end, and the second end.

2. The anchor rod length detection method according to claim 1, characterized in that: When acquiring the tensioned anchor rod, the time difference between the acoustic emission signal of the first end of the anchor rod detected by the first acoustic emission sensor and the second acoustic emission sensor includes: Acquire the times of multiple acoustic emission signals detected by the first acoustic emission sensor, and use the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the first time; Acquire the times of multiple acoustic emission signals detected by the second acoustic emission sensor, and use the latest time among them as the time corresponding to the first end of the anchor rod, recorded as the second time; The difference between the first time and the second time is calculated to obtain the time difference between the first acoustic emission sensor and the second acoustic emission sensor detecting the acoustic emission signal of the first end of the anchor rod.

3. The anchor rod length detection method according to claim 1, characterized in that: The distance geometric relationship model is: In the formula, a is the length of the anchor rod, b is the distance between the first acoustic emission sensor and the second end, c is the distance between the second acoustic emission sensor and the second end, v is the preset sound speed, and Δt is the time difference.

4. The anchor rod length detection method according to claim 3, characterized in that: The preset sound speed is determined by measuring the material medium in which the anchor rod is located.

5. The anchor rod length detection method according to claim 1, characterized in that: Before acquiring the time difference between the first acoustic emission sensor and the second acoustic emission sensor detecting the acoustic emission signal of the first end of the anchor rod, the method further includes: Determining whether the number of acoustic emission signals detected by the first acoustic emission sensor is equal to the number of acoustic emission signals detected by the second acoustic emission sensor when the anchor is tensioned; If not, the anchor rod is re-tensioned, and the time difference between the first acoustic emission sensor and the second acoustic emission sensor detecting the acoustic emission signal of the first end of the anchor rod is obtained.

6. The anchor rod length detection method according to claim 1, characterized in that: After determining the length of the anchor rod, the method further includes: Repeat the measurement of the length of the anchor rod for multiple times and delete abnormal values; The average of the remaining lengths is calculated and taken as the final length of the anchor rod.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

9. An anchor rod length detection system, characterized in that: include: A first acoustic emission sensor, a second acoustic emission sensor, an acoustic emission instrument, and an electronic device as claimed in claim 7; The first acoustic emission sensor and the second acoustic emission sensor are used to be arranged on a target plane and connected to the acoustic emission instrument; The acoustic emission instrument is connected to the electronic device.

10. The anchor rod length detection system according to claim 9, characterized in that: The first acoustic emission sensor and the second acoustic emission sensor are arranged on a planar structure through a slide groove, and the first acoustic emission sensor and the second acoustic emission sensor can both move along the slide groove.

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