A shielding quality detection system for copper core control cable

Abstract

The application provides a kind of copper core control cable shielding quality detection system, including sampling module, detection signal transceiver module, pulse signal transceiver module, image acquisition module and fault analysis module;The sampling module is used to obtain the copper core control cable to be detected;The detection signal transceiver module is used to detect whether the shielding layer of the cable fails;The pulse signal transceiver module is used to measure the shielding quality index of the cable, and the shielding quality index is used to evaluate the shielding quality of the copper core control cable;The image acquisition module is used to obtain the image of the position of the shielding layer of the cable that fails;The fault analysis module is used to analyze the relationship between the shielding layer failure and the shielding quality index.The application adopts the mode of detecting first and then calculating, which is beneficial to divide the shielding quality index into two parts of fault cable and non-fault cable, and is beneficial to improve the accuracy of the index.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cable detection, and in particular to a shielding quality detection system for copper core control cables. BACKGROUND

[0002] With the rapid development of information technology and the increasing demand for high-speed and high-bandwidth communication in modern society, copper core control cables, as an important communication medium, play a crucial role in network communication and data transmission. Copper core control cables are used to transmit telecommunications, internet and local area network data, and are mainly applied to electrical appliances, instruments and electronic devices, etc., and their performance directly affects the stability of communication quality and network performance. However, cables can be subjected to various external disturbances and damage during use, so a reliable shielding quality detection system is needed to ensure their normal operation.

[0003] A multi-core cable assembly shielding effect detection method based on a probe method is disclosed in the prior art CN110412371A, which comprises the following steps: 1) configuring the test system according to the principle of the probe method; 2) before the test starts, the test equipment is powered on and preheated to reach a stable working state, and the test system is calibrated to ensure that the measurement deviation does not exceed the acceptable range; 3) set the frequency and level of the signal source, inject the signal to the core wire of the multi-core cable assembly and reach a stable working state; 4) clamp the current probe on the multi-core cable assembly to be tested; 5) set the bandwidth and test time of the receiver, and scan and select the maximum value in the applicable frequency range.

[0004] Another typical cable shielding test system and test method is disclosed in the prior art CN105116262A, which comprises a test sleeve, a signal generator and a signal receiver, one end of the test sleeve is provided with a first closed tube, the other end of the test sleeve is provided with a second closed tube, and the first closed tube and the second closed tube are fixedly connected with the test sleeve.

[0005] Another typical cable shielding test system and test method is disclosed in the prior art CN105116262A, which comprises a test sleeve, a signal generator and a signal receiver, one end of the test sleeve is provided with a first closed tube, the other end of the test sleeve is provided with a second closed tube, and the first closed tube and the second closed tube are fixedly connected with the test sleeve.

[0006] At present, the shielding quality detection method of the copper core control cable in the field is relatively single, cannot detect whether the cable exists fault while measuring the shielding quality, and cannot adjust the shielding quality index according to whether the cable exists fault, in order to solve the problems existing in the field, the present application is made. SUMMARY

[0007] The present application aims at the existing problems, and provides a shielding quality detection system of copper core control cable.

[0008] In order to overcome the shortcomings of the prior art, the present application adopts the following technical scheme:

[0009] A shielding quality detection system of copper core control cable, comprising a sampling module, a detection signal transceiving module, a pulse signal transceiving module, an image acquisition module and a fault analysis module; the sampling module is used for obtaining the copper core control cable to be detected; the detection signal transceiving module is used for detecting whether the shielding layer of the copper core control cable to be detected exists fault; the pulse signal transceiving module is used for calculating the shielding quality index of the cable according to the detection result of the detection signal transceiving module, and the fault analysis module is used for analyzing the relationship between the shielding layer fault and the shielding quality index according to the detection result of the detection signal transceiving module and the shielding quality index; when the detection signal transceiving module detects that the fault exists, the image acquisition module acquires the image of the position of the shielding layer fault of the copper core control cable to be detected;

[0010] The pulse signal transceiving module measures the provisional shielding quality index of the fault-free cable by the following formula:

[0011] =20* ;

[0012] Wherein, is the provisional shielding quality index of the fault-free cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the second pulse signal received by the pulse signal receiving unit;

[0013] The pulse signal transceiving module measures the provisional shielding quality index of the fault-free cable by the following formula:

[0014] = ;

[0015] Wherein, is the provisional shielding quality index of the fault-free cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the third pulse signal received by the pulse signal receiving unit.

[0016] Further, the detection signal transceiver module comprises a detection signal sending unit, a detection signal coupling unit, a detection signal receiving unit, a current detection unit and a fault judgment unit; the detection signal sending unit is used for sending detection signals; the detection signal coupling unit is used for coupling the detection signal sending unit to the shielding layer of the cable; the detection signal receiving unit is used for receiving the detection signals passing through the cable; the current detection unit is used for detecting the current of the detection signals passing through the cable; and the fault judgment unit is used for judging whether the cable has faults according to the detection result of the current detection unit.

[0017] Further, the pulse signal transceiver module comprises a pulse signal sending unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit and a calculation unit; the pulse signal sending unit is used for sending pulse signals; the pulse signal adjusting unit is used for adjusting the frequency of the pulse signals sent by the pulse signal sending unit; the pulse signal coupling unit is used for coupling the pulse signal sending unit to the core wire of the cable; the pulse signal receiving unit is used for receiving pulse signals; and the calculation unit is used for calculating the fault position of the shielding layer and the shielding quality index of the cable.

[0018] Further, the image acquisition module comprises a cutting unit, an image shooting unit and an image recognition unit; the cutting unit is used for cutting the cable fault position according to the calculation result of the calculation unit; the image shooting unit is used for shooting the shielding layer exposed by the cable after being cut by the cutting unit; and the image recognition unit is used for recognizing the shielding layer defects in the shooting image of the image shooting unit.

[0019] Further, the shielding quality detection system of the copper core control cable works as follows:

[0020] S1, the sampling unit acquires the cable which needs to be detected for shielding quality;

[0021] S2, the detection signal transceiver module detects whether the shielding layer of the cable acquired by the sampling unit has faults, if not, S3 is executed; otherwise, S4 is executed;

[0022] S3, the pulse signal transceiver module calculates the shielding quality index of the fault-free cable, and the process ends;

[0023] S4, the pulse signal transceiver module calculates the shielding quality index of the fault cable and the position of the fault point;

[0024] S5, the image acquisition module acquires the image of the position where the shielding layer of the cable has faults;

[0025] S6, the fault analysis module analyzes the relationship between the shield failure and the shield quality index.

[0026] Further, the detection signal transceiving module detecting whether the shield of the cable obtained by the sampling unit is faulty includes the following steps:

[0027] S21, the detection signal coupling unit couples the detection signal sending unit to the shield of the cable;

[0028] S22, the detection signal sending unit sends the detection signal according to the set current size, and the detection signal propagates through the cable;

[0029] S23, the detection signal receiving unit receives the detection signal obtained after propagating through the cable;

[0030] S24, the fault judgment unit judges whether the current value of the detection signal after propagating through the cable is less than the set threshold value, if yes, the cable is faulty, if not, the cable is not faulty.

[0031] Further, in S3, the pulse signal transceiving module measures the shield quality index of the non-faulty cable includes the following steps:

[0032] S31, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable;

[0033] S32, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable;

[0034] S33, the calculation unit calculates the temporary shield quality index of the non-faulty cable by the following formula:

[0035] = ;

[0036] Wherein, is the temporary shield quality index of the non-faulty cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the second pulse signal received by the pulse signal receiving unit;

[0037] S34, change the frequency of the first pulse signal sent by the pulse signal sending unit, return to S31, repeat 10 times, and take the average value of the temporary shield quality index of the non-faulty cable calculated 10 times as the shield quality index of the non-faulty cable.

[0038] Further, in S4, the pulse signal transceiving module measures the shield quality index of the faulty cable and the position of the fault point includes the following steps:

[0039] S41, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable;

[0040] S42, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable;

[0041] S43, the calculation unit calculates the temporary shielding quality index of the fault cable according to the signal received by the pulse signal receiving unit through the following formula:

[0042]

[0043] Wherein, is the temporary shielding quality index of the fault cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the third pulse signal received by the pulse signal receiving unit;

[0044] S44, according to the position of the fault point according to the following formula:

[0045] D=0.5*t*speed;

[0046] Wherein, D is the distance between the fault point and the pulse signal sending unit, t is the time experienced from sending the pulse signal to receiving the reflected signal, which is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit;

[0047] S45, change the frequency of the first pulse signal sent by the pulse signal sending unit, return to S41, repeat 10 times, and take the average value of the temporary shielding quality index of the fault cable calculated 10 times as the shielding quality index of the fault cable.

[0048] The beneficial effects obtained by the present application are: 1. By adopting the mode of detecting first and then calculating, whether the shielding layer of the cable is faulty is detected first, then different shielding quality index measurement modes are selected according to whether the fault occurs, and the shielding quality index is divided into two parts of fault cable and non-fault cable, which is beneficial to improve the accuracy of judging whether the cable is faulty;

[0049] 2. The image acquisition module is used to acquire the image of the fault position, which is beneficial to judge the fault condition of the shielding layer of the cable and analyze the influence of the shielding layer defect size on the shielding quality of the cable;

[0050] ​​3. The shield quality index of the cable and the location of the fault point are measured by using the pulse signal, the operation is simple and fast, the data is accurate, the frequency of the pulse signal can be changed at any time for multiple measurements, which is beneficial to reduce the operation burden of the staff and improve the accuracy of the index. BRIEF DESCRIPTION OF DRAWINGS

[0051] The present application can be further understood from the following description in conjunction with the drawings. The components in the drawings are not necessarily drawn to scale, but emphasis is instead placed upon illustrating the principles of the embodiments. Like reference numerals designate like parts throughout the different views.

[0052] Figure 1 The structural schematic diagram of the present application.

[0053] Figure 2 The working flowchart of the present application.

[0054] Figure 3 The flowchart of the signal detection and transmission module of the present application detecting whether the shield layer of the cable is faulty.

[0055] Figure 4 The flowchart of the pulse signal detection and transmission module of the present application measuring the shield quality index of the cable without fault.

[0056] Figure 5 The working flowchart of the second embodiment of the present application. DETAILED DESCRIPTION

[0057] The following is to illustrate the embodiments of the present application by specific embodiments, and the advantages and effects of the present application can be understood by the person skilled in the art from the disclosure of the present application. The present application can be implemented or applied by other different embodiments, and each detail in the present application can be modified and changed based on different viewpoints and applications without departing from the spirit of the present application. In addition, the drawings of the present application are only simple schematic illustrations, not the depiction according to the actual size, and the prior declaration is made. The following embodiments will further illustrate the related technical content of the present application in detail, but the disclosed content is not used to limit the protection scope of the present application.

[0058] Embodiment one: according to Figure 1 , Figure 2 , Figure 3 and Figure 4The embodiment provides a shielding quality detection system of a copper core control cable, which comprises a sampling module, a detection signal transceiving module, a pulse signal transceiving module, an image acquisition module and a fault analysis module; the sampling module is used for obtaining the copper core control cable to be detected; the detection signal transceiving module is used for detecting whether the shielding layer of the copper core control cable to be detected is faulty; the pulse signal transceiving module is used for calculating the shielding quality index of the cable according to the detection result of the detection signal transceiving module; the fault analysis module is used for analyzing the relationship between the shielding layer fault and the shielding quality index according to the detection result of the detection signal transceiving module and the shielding quality index; when the detection signal transceiving module detects that the fault occurs, the image acquisition module acquires the image of the position of the shielding layer of the copper core control cable to be detected where the fault occurs.

[0059] The pulse signal transceiving module measures the provisional shielding quality index of the non-faulty cable by the following formula:

[0060] =20* ;

[0061] Wherein, is the provisional shielding quality index of the non-faulty cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the second pulse signal received by the pulse signal receiving unit.

[0062] The pulse signal transceiving module measures the provisional shielding quality index of the faulty cable by the following formula:

[0063] = ;

[0064] Wherein, is the provisional shielding quality index of the faulty cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the third pulse signal received by the pulse signal receiving unit.

[0065] The first pulse signal is the pulse signal sent by the pulse signal sending unit, the second pulse signal is the pulse signal received by the pulse signal receiving unit after the non-faulty cable, and the third pulse signal is the pulse signal received by the pulse signal receiving unit after the faulty cable.

[0066] Specifically, the smaller the provisional shielding quality index is, the better the shielding performance of the cable is.

[0067] Specifically, the fault analysis module fits the relationship between the shielding layer fault and the shielding quality index by using different models, and judges the fitting results of different models by the accuracy index, selects a model with the highest accuracy index, and uses the model to represent the relationship between the shielding layer fault and the shielding quality index.

[0068] Further, the detection signal transceiver module includes a detection signal sending unit, a detection signal coupling unit, a detection signal receiving unit, a current detection unit, and a fault judgment unit; the detection signal sending unit is configured to send a detection signal; the detection signal coupling unit is configured to couple the detection signal sending unit to the shielding layer of the cable; the detection signal receiving unit is configured to receive the detection signal passing through the cable; the current detection unit is configured to detect the current of the detection signal passing through the cable; and the fault judgment unit is configured to judge whether the cable has a fault according to the detection result of the current detection unit.

[0069] Specifically, if the current of the detection signal passing through the cable is less than a set threshold, it can be judged that the shielding layer of the cable has a fault.

[0070] Further, the pulse signal transceiver module includes a pulse signal sending unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit, and a calculation unit; the pulse signal sending unit is configured to send a pulse signal; the pulse signal adjusting unit is configured to adjust the frequency of the pulse signal (i.e., a first pulse signal) sent by the pulse signal sending unit; the pulse signal coupling unit is configured to couple the pulse signal sending unit to the core wire of the cable; the pulse signal receiving unit is configured to receive pulse signals (i.e., a second pulse signal and a third pulse signal); and the calculation unit is configured to calculate the fault position of the shielding layer and the shielding quality index of the cable. Different groups of pulse signals can be obtained by using pulse signals with different frequencies, and then a plurality of shielding quality indexes can be obtained to obtain more objective index parameters.

[0071] Further, the image acquisition module includes a cutting unit, an image shooting unit, and an image recognition unit; the cutting unit is configured to cut the cable fault position according to the calculation result of the calculation unit; the image shooting unit is configured to shoot the shielding layer exposed by the cable after being cut by the cutting unit; and the image recognition unit is configured to recognize the shielding layer defects in the shooting image of the image shooting unit.

[0072] Specifically, the image recognition unit obtains the boundary of the shielding layer defects by using an edge detection algorithm, and obtains the area size of the defects by calculating the number of pixels of the defects in the shielding layer pixel image.

[0073] The image acquisition module acquires the image of the fault position, which is beneficial to judge the fault condition of the shielding layer of the cable and analyze the influence of the shielding layer defect size on the shielding quality of the cable.

[0074] Further, the shielding quality detection system of the copper core control cable has the following working process:

[0075] S1, the sampling unit acquires the cable which needs to be detected for shielding quality;

[0076] S2, the detection signal transceiver module detects whether the shielding layer of the cable acquired by the sampling unit has a fault, if not, S3 is executed; otherwise, S4 is executed;

[0077] S3, the pulse signal transceiver module calculates the shielding quality index of the fault-free cable, and the process ends;

[0078] S4, the pulse signal transceiver module calculates the shielding quality index of the fault cable and the position of the fault point;

[0079] S5, the image acquisition module acquires the image of the position where the shielding layer of the cable has a fault;

[0080] S6, the fault analysis module analyzes the relationship between the shielding layer fault and the shielding quality index.

[0081] Further, the detection signal transceiver module detecting whether the shielding layer of the cable acquired by the sampling unit has a fault includes the following steps:

[0082] S21, the detection signal coupling unit couples the detection signal sending unit to the shielding layer of the cable;

[0083] S22, the detection signal sending unit sends the detection signal according to the set current size, and the detection signal propagates through the cable;

[0084] S23, the detection signal receiving unit receives the detection signal after propagating through the cable;

[0085] S24, the fault judgment unit judges whether the current value of the detection signal after propagating through the cable is less than the set threshold, if yes, the cable has a fault, if not, the cable has no fault.

[0086] By adopting the method of detecting first and then calculating, whether the shielding layer of the cable has a fault is detected first, and then different shielding quality index measurement methods are selected according to whether the fault occurs, and the shielding quality index is divided into two parts of fault cable and fault-free cable, which is beneficial to improve the accuracy of judging whether the cable has a fault.

[0087] Further, in S3, the pulse signal transceiver module measures the shielding quality index of the fault-free cable, including the following steps:

[0088] S31, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable;

[0089] S32, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable;

[0090] S33, the calculation unit calculates the temporary shielding quality index of the fault-free cable through the following formula:

[0091]

[0092] wherein, is the temporary shielding quality index of the fault-free cable, is the signal amplitude of the first pulse signal sent by the pulse signal sending unit, is the signal amplitude of the second pulse signal received by the pulse signal receiving unit;

[0093] S34, the frequency of the first pulse signal sent by the pulse signal sending unit is changed, and S31 is returned to be repeated 10 times. The average value of the temporary shielding quality indexes of the fault-free cable calculated 10 times is taken as the shielding quality index of the fault-free cable.

[0094] Further, in S4, the pulse signal transceiver module measures the shielding quality index of the fault cable and the position of the fault point, comprising the following steps:

[0095] S41, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable;

[0096] S42, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable;

[0097] Specifically, when the pulse propagates in the cable, when it encounters a shielding fault, due to the change of the cable wave impedance, the pulse will be partially reflected, and the original pulse signal will be converted into a partial reflection signal and an attenuation signal. By collecting the pulse signal and the reflection signal, the position of the shielding break can be located;

[0098] Specifically, the part of the reflection signal received by the pulse signal receiving unit is on the same side of the cable as the pulse signal sending unit, and the part of the attenuated pulse signal received by the pulse signal receiving unit is on the opposite side of the cable as the pulse signal sending unit;

[0099] S43, the calculation unit calculates the temporary shielding quality index of the fault cable according to the signal received by the pulse signal receiving unit through the following formula:

[0100] ;​​​

[0101] wherein, is a temporary shielding quality index of the faulty cable, is a signal amplitude of the first pulse signal sent by the pulse signal sending unit, is a signal amplitude of the third pulse signal received by the pulse signal receiving unit;

[0102] S44, according to the position of the fault point according to the following formula:

[0103] D = 0.5 * t * speed;

[0104] wherein, D is the distance between the fault point and the pulse signal sending unit, t is the time experienced from sending the pulse signal to receiving the reflected signal, which is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit;

[0105] S45, change the frequency of the first pulse signal sent by the pulse signal sending unit, return to S41, repeat 10 times, and take the average of the temporary shielding quality indexes of the faulty cable calculated 10 times as the shielding quality index of the faulty cable.

[0106] By using the pulse signal to measure the shielding quality index of the cable and the position of the fault point, the operation is simple and fast, the data accuracy is high, and the frequency of the pulse signal can be changed at any time to perform multiple measurements, which is beneficial to reduce the operation burden of the staff and improve the accuracy of the index.

[0107] Specifically, by comparing the shielding quality indexes of the faulty cable and the non-faulty cable with the first threshold value, if the shielding quality index is less than the first threshold value, the shielding quality of the cable is excellent, if the shielding quality index is greater than the first threshold value but less than the second threshold value, the shielding quality of the cable is general, and if the shielding quality index is greater than the second threshold value, the shielding quality of the cable is unqualified. It should be noted that the first threshold value is less than the second threshold value, and the first threshold value and the second threshold value are set by referring to industry specifications and actual customer requirements by those skilled in the art.

[0108] Embodiment two: this embodiment should be understood as containing all the features of any one of the preceding embodiments, and further improving on the basis thereof, according to Figure 5 Further, the fault analysis module analyzes the relationship between the shielding layer fault and the shielding quality index, including the following steps:

[0109] S61, in all cables under detection, the range (B, C) of the calculation results of the shielding quality indexes of different cables under non-fault conditions is obtained;

[0110] S62, among all the cables tested, obtain the collection of the total defect area of ​​the shielding layer of different cables under fault conditions. ], and the corresponding set of cable shielding quality indicators [ ], where n is the total number of faulty cables;

[0111] S63 uses four different models to fit x and y, obtaining the linear relationship between x and y: y = (x), polynomial relation y= (x), the hyperbolic function (one branch) relation y= (x), Exponential curve relationship y= (x);

[0112] Specifically, the linear relationship can be represented by y= *x, the polynomial relation can be y= * + *x+ The hyperbolic function relationship can be y= The exponential curve relationship can be expressed as y = * Where e is the natural constant, The coefficients of the relation;

[0113] S64. Generate the accuracy index for each model according to the following formula, and select the model with the highest accuracy index as the relationship between shielding layer fault and shielding quality index:

[0114] ;

[0115] Where A is the accuracy index, and m is the total number of fault-free cables. Input to the current model The corresponding output, The output corresponding to the input 0 in the current model. This represents the average shielding quality index of different cables under non-fault conditions, where e is a natural constant.

[0116] Specifically, the higher the accuracy index, the higher the accuracy of the model.

[0117] The beneficial effects of this embodiment are as follows: By using different models to fit the relationship between shielding layer faults and shielding quality indicators, and by using the accuracy index to judge the accuracy of the fitting results of each model, it is helpful to select the model with the highest fit. Through this model, staff can understand the relationship between the area of ​​shielding layer defects and shielding quality, which is helpful for staff to make further improvements to the cable.

[0118] The above disclosed are only the preferred and feasible embodiments of the present application, and are not intended to limit the protection scope of the present application, so any equivalent technical changes made according to the content of the present application and the drawings are included in the protection scope of the present application, and furthermore, the elements can be updated as the technology develops.

Claims

1. A system for detecting the quality of a shield of a copper core control cable, characterized by, The system comprises a sampling module, a detection signal transceiver module, a pulse signal transceiver module, an image acquisition module and a fault analysis module; the sampling module is used to acquire the copper core control cable to be detected; the detection signal transceiver module is used to detect whether the shielding layer of the copper core control cable to be detected has a fault; the pulse signal transceiver module is used to calculate the shielding quality index of the cable according to the detection result of the detection signal transceiver module; and the fault analysis module is used to analyze the relationship between the shielding layer fault and the shielding quality index according to the detection result of the detection signal transceiver module and the shielding quality index. When the detection signal transceiver module detects that a fault occurs, the image acquisition module acquires the image of the position of the shielding layer of the copper core control cable to be detected where the fault occurs. The pulse signal transceiver module measures the provisional shielding quality index of the fault-free cable by the following formula: =20* ; wherein is a provisional shielding quality indicator for a fault-free cable, is a signal amplitude of a first pulse signal transmitted by the pulse signal transmitting unit, is a signal amplitude of a second pulse signal received by the pulse signal receiving unit; The pulse signal transceiver module measures the provisional shielding quality index of the fault-free cable by the following formula: = ; wherein is a provisional shielding quality indicator for the faulty cable, is a signal amplitude of a first pulse signal transmitted by the pulse signal transmitting unit, is a signal amplitude of a third pulse signal received by the pulse signal receiving unit; The detection signal transceiver module comprises a detection signal sending unit, a detection signal coupling unit, a detection signal receiving unit, a current detection unit and a fault judgment unit; the detection signal sending unit is used to send a detection signal; the detection signal coupling unit is used to couple the detection signal sending unit to the shielding layer of the cable; the detection signal receiving unit is used to receive the detection signal passing through the cable; the current detection unit is used to detect the current of the detection signal received by the detection signal receiving unit; and the fault judgment unit is used to judge whether the cable has a fault according to the detection result of the current detection unit. The pulse signal transceiver module comprises a pulse signal sending unit, a pulse signal adjusting unit, a pulse signal coupling unit, a pulse signal receiving unit and a calculation unit; the pulse signal sending unit is used to send a pulse signal; the pulse signal adjusting unit is used to adjust the frequency of the pulse signal sent by the pulse signal sending unit; the pulse signal coupling unit is used to couple the pulse signal sending unit to the core wire of the cable; the pulse signal receiving unit is used to receive the pulse signal; and the calculation unit is used to calculate the fault position of the shielding layer and the shielding quality index of the cable. The image acquisition module comprises a cutting unit, an image shooting unit and an image recognition unit; the cutting unit is used to cut the cable fault position according to the calculation result of the calculation unit; the image shooting unit is used to shoot the shielding layer exposed by the cable after being cut by the cutting unit; and the image recognition unit is used to recognize the shielding layer defects in the shooting image of the image shooting unit. The working process of the shielding quality detection system of the copper core control cable is as follows: S1, the sampling unit acquires the cable to be detected; S2, the detection signal transceiver module detects whether the shielding layer of the cable acquired by the sampling unit has a fault, if not, S3 is executed; otherwise, S4 is executed; S3, the pulse signal transceiver module calculates the shielding quality index of the fault-free cable, and the process ends; S4, the pulse signal transceiver module calculates the shielding quality index of the fault-free cable and the position of the fault point; S5, the image acquisition module acquires the image of the position of the shielding layer of the cable where the fault occurs. S6, the fault analysis module analyzes the relationship between the shield layer fault and the shield quality index; The detection signal transceiving module detects whether the shield layer of the cable obtained by the sampling unit has a fault, and includes the following steps: S21, the detection signal coupling unit couples the detection signal sending unit to the shield layer of the cable; S22, the detection signal sending unit sends the detection signal according to the set current size, and the detection signal is propagated through the cable; S23, the detection signal receiving unit receives the detection signal obtained after the propagation through the cable; S24, the fault judgment unit judges whether the current value of the detection signal after the propagation through the cable is less than the set threshold value, if yes, the cable has a fault, if not, the cable has no fault; In S3, the pulse signal transceiving module measures the shield quality index of the non-fault cable, including the following steps: S31, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable; S32, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable; S33, the calculation unit calculates the temporary shield quality index of the non-fault cable by the following formula: = ; wherein is a provisional shielding quality indicator for a fault-free cable, is a signal amplitude of a first pulse signal transmitted by the pulse signal transmitting unit, is a signal amplitude of a second pulse signal received by the pulse signal receiving unit; S34, the frequency of the first pulse signal sent by the pulse signal sending unit is changed, and S31 is returned to repeat 10 times, and the average value of the temporary shield quality index of the non-fault cable calculated 10 times is taken as the shield quality index of the non-fault cable; Wherein, the fault analysis module analyzes the relationship between the shield layer fault and the shield quality index includes the following steps: S61, in all the cables accepted for detection, the range (B, C) of the calculation results of the shield quality index of different cables under non-fault condition is obtained; S62, among all the cables tested, obtain the collection of the total defect area of ​​the shielding layer of different cables under fault conditions. ], and the corresponding set of cable shielding quality indicators [ ], where n is the total number of faulty cables; S63, four different models are used to fit x and y to obtain linear relationship of x and y y= (x), polynomial relationship of y (x), hyperbolic function relationship of y (x), exponential curve relationship of y (x); Specifically, the linear relationship is y = ax + b, the polynomial relationship is y = ax2+ bx + c, * + *x+ the hyperbolic function relationship is y = a sinh(x) + b cosh(x), and the exponential curve relationship is y = aex+ b. * ; where e is a natural constant, a is a coefficient of the relationship. S64, the accuracy index of each model is generated according to the following formula, and the model with the maximum accuracy index is selected as the relationship between the shield layer fault and the shield quality index: ； where A is the accuracy indicator, m is the total number of cables without faults, is the output corresponding to the input in the current model, is the output corresponding to the input 0 in the current model, is the mean of the shielding quality indicator of the different cables in the absence of faults, e is the natural constant.

2. The shield quality detection system for a copper core control cable according to claim 1, wherein In S4, the pulse signal transceiving module measures the shield quality index of the fault cable and the position of the fault point, including the following steps: S41, the pulse signal coupling unit couples the pulse signal sending unit to the core wire of the cable; S42, the pulse signal sending unit sends the pulse signal, and the pulse signal is transmitted to the pulse signal receiving unit through the cable; S43, the calculation unit calculates the temporary shield quality index of the fault cable according to the signal received by the pulse signal receiving unit by the following formula: = ； wherein is a provisional shielding quality indicator of the faulty cable, is a signal amplitude of a first pulse signal transmitted by the pulse signal transmitting unit, is a signal amplitude of a third pulse signal received by the pulse signal receiving unit; S44, according to the position of the fault point: D=0.5*t*speed; Wherein, D is the distance between the fault point and the pulse signal sending unit, t is the time experienced from sending the pulse signal to receiving the reflected signal, which is measured by the pulse signal receiving unit; speed is the wave speed, which is determined by the frequency of the first pulse signal sent by the pulse signal sending unit; S45, the frequency of the first pulse signal sent by the pulse signal sending unit is changed, and S41 is returned to repeat 10 times, and the average value of the temporary shield quality index of the fault cable calculated 10 times is taken as the shield quality index of the fault cable.

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