CN117542585B - Wire harness shielding wire protective sleeve pushing and stretching device and application method thereof - Google Patents
Wire harness shielding wire protective sleeve pushing and stretching device and application method thereof Download PDFInfo
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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Abstract
The invention belongs to the field of sheath stretching, and particularly relates to a wire harness shielding wire protective sleeve pushing and stretching device and a using method thereof. The FDR technology based on the surface electromagnetic wave is adopted in the scheme, so that the nondestructive damage detection of the cable is realized under the condition of no power on, and the possibility of causing electric safety problems to operators is greatly reduced; the method comprises the steps that a surface electromagnetic wave transmitter and a surface electromagnetic wave receiver are arranged on a clamping jaw to realize the transmission of a reference signal and the reception of a reflected signal; the stability of the cable to be stretched is ensured by arranging a clamping block of the clamping jaw; the damage detection is carried out by adopting the self-encoder regression network, reflected signal jump caused by damage and noise is distinguished, spectrogram disturbance caused by noise is avoided, and the quality of cable damage detection after pushing and stretching is ensured.
Description
Technical Field
The invention belongs to the field of sheath stretching, and particularly relates to a push stretching device for a harness shielding wire sheath and a use method thereof.
Background
ETC system is an electronic toll collection system which adopts computer network to realize no parking and no toll collection window and can realize full automation. However, in the traditional processing process of the ETC harness shielding wire, workers are required to drag the wire skin by hands, and the problem of hand nerve fatigue of the workers is caused by long-time processing; after the protection sleeve is not pushed and stretched, the damage is detected aiming at the protection sleeve integration; aiming at the traditional damage detection method of the FDR protective sleeve, the problem that the frequency spectrogram of the reflected signal has artifacts caused by noise and affects the damage detection precision exists.
Disclosure of Invention
Aiming at the situation, the invention provides a push-pull device for a wire harness shielding wire protective sleeve and a use method thereof, which aim to overcome the defects of the prior art. Aiming at the problems that in the traditional processing process of the ETC wire harness shielding wire, workers need to drag the wire skin by hands and long-time processing leads to hand nerve fatigue of the workers, the proposal designs a wire harness shielding wire protecting sleeve pushing and stretching device, thereby realizing automatic and mechanized pushing and stretching processes; after the needle is not pushed and stretched by the protective sleeve, the damage is detected aiming at the integral protective sleeve, and the FDR technology based on the surface electromagnetic wave is adopted in the scheme, so that the possibility of causing electric safety problems to operators is greatly reduced; aiming at the problems that the damage detection precision is affected due to the fact that noise causes artifacts in a spectrogram of a reflected signal in the traditional FDR protective sleeve detection damage method, the scheme adopts an autoreconder regression network to perform damage detection, distinguishes the reflected signal caused by damage, and ensures the quality of cable damage detection after pushing and stretching.
The technical scheme adopted by the invention is as follows:
the invention provides a wire harness shielding wire protective sleeve pushing and stretching device which comprises a sliding track device, a front end sheath wire clamp, a clamping jaw, a wire holding clamping jaw and a control system, wherein the sliding track device is arranged on a horizontal plane;
the sliding track device comprises a base, a motor groove, a guide track, a roller A, a roller B, a belt and a motor, wherein the base is arranged on a horizontal plane, the guide track is fixedly arranged on the upper wall of the base, the motor groove is formed in the guide track, the roller A is rotationally arranged at one end of the inner wall of the motor groove, the roller B is rotationally arranged at the other end of the inner wall of the motor groove, the belt is arranged in the motor groove, two ends of the belt are fixedly connected with two side walls of a wire holding clamp claw respectively, the middle part of the belt is wound on the roller A and the roller B, the motor is fixedly arranged on the inner wall of the guide track, the output end of the motor is coaxially and fixedly connected with the roller A, and the motor is electrically connected with a control system;
the front-end sheath wire clamp comprises a vertical plate and a transverse plate, wherein the lower end of the vertical plate is fixedly arranged on the upper wall of the base, the transverse plate is fixedly arranged on the upper end of the side wall of the vertical plate, and a groove is formed in the upper end of the transverse plate;
the clamping jaw is fixedly arranged at the other end of the base, an upper clamping plate A and a lower clamping plate A are arranged at the output end of the clamping jaw, clamping blocks are respectively and fixedly arranged on the lower wall of the upper clamping plate A and the upper wall of the lower clamping plate A, elastic pressing blocks are respectively arranged on the lower wall of the upper clamping plate A and the upper wall of the lower clamping plate A, the elastic pressing blocks are arranged on one side, close to the wire holding clamping jaw, of the clamping blocks, a surface electromagnetic wave emitter and a surface electromagnetic wave receiver are embedded on the elastic pressing blocks, and the surface electromagnetic wave emitter and the surface electromagnetic wave receiver are respectively and electrically connected with the control system;
the wire holding clamping jaw is fixedly provided with a sliding base, the sliding base is connected to the guide rail in a sliding and clamping mode, the output end of the wire holding clamping jaw is provided with an upper clamping plate B and a lower clamping plate B, the lower wall of the upper clamping plate B and the upper wall of the lower clamping plate B are respectively provided with a wire stripping groove, the bottom wall of the wire stripping groove on the lower clamping plate B is provided with a stress meter, and the stress meter is electrically connected with the input end of the control system.
The using method of the wire harness shielding wire protective sleeve pushing and stretching device comprises the following steps of:
step S1: the cable is fixed, the insulated wire sleeved in the sheath is marked as a cable to be stretched, the front end of the cable to be stretched is placed into a groove of a sheath wire clamp at the front end to be fixed, the tail end of the cable to be stretched is fixed by using a clamping block of a clamping jaw, and an elastic pressing block of the clamping jaw is attached to the cable to be stretched;
step S2: the clamping jaw is controlled, the clamping control mode of the wire clamping jaw adopts displacement control, the stress of the cable to be stretched is measured in real time by a stress meter, and the tail end of the cable to be stretched is clamped by an upper clamping plate B and a lower clamping plate B;
step S3: carrying out wire stripping operation, wherein a control system controls a motor to drive a belt, and a wire holding clamp moves at a constant speed to push and stretch a cable to be stretched, so as to obtain a wire harness shielding wire;
step S4: transmitting a reference signal, wherein the surface electromagnetic wave transmitter transmits the reference signal;
step S5: receiving the reflected signal, and receiving the reflected signal by a surface electromagnetic wave receiver;
step S6: denoising, namely building and training a self-encoder model, and denoising the reflected signal;
step S7: detecting damage, namely detecting whether the sheath of the wire harness shielding wire is damaged or not;
step S8: and (3) resetting the original point, loosening the front-end sheath wire clamp, the wire holding clamping jaw and the clamping jaw, taking out the wire harness shielding wire, and enabling the wire holding clamping jaw to automatically move to an initial position.
Further, in step S2, the jaw control specifically includes the following steps:
step S21: the stress meter measures the stress of the cable to be stretched in real time, and a mark for clamping the cable by the clamp holding claw is preset as the preset stress intensity;
step S22: when the stress measured by the stress meter is equal to 0, the upper clamping plate B does not touch the cable to be stretched, and the clamp holding claw clamps at a rated high speed;
step S23: when the stress measured by the stress meter is not equal to 0, the upper clamping plate B is in contact with the cable to be stretched, the cable to be stretched is stressed, the wire holding clamp clamps clamp at the rated slow speed until the stress measured by the stress meter reaches the preset stress intensity, the upper clamping plate B stops moving, and the wire holding clamp clamps clamp force pushing the cable to be stretched.
Further, in step S4, a reference signal is transmitted, specifically, the surface electromagnetic wave transmitter transmits the reference signal, and a square sinusoidal signal is used as the transmitted reference signal, and the formula is as follows:
；
in the method, in the process of the invention,is a square sine signal, which is used for generating a sine signal,is the cumulative sum of square sine signals for each step frequency,it is the propagation time that is set to be,is a rectangular window function with a fixed time span,is the total number of step frequency categories,is the reference frequency of the reference signal,is a sinusoidal function which is a function of the sine,is the resolution of the image to be processed,is the step frequency of the reference signal.
Further, in step S5, a reflected signal, specifically, a reflected signal of each step frequency is received by the surface electromagnetic wave receiver.
Further, in step S6, the denoising process specifically includes the following steps:
step S61: distortion caused by attenuation and distortion in the process of transmitting the restored reflected signal, outputting a restored reflected signal A containing damage characteristics, and the calculation formula is as follows:
；
in the method, in the process of the invention,in order to locate the lesion,is composed of a special medicine for treating injuryThe reflected signal of the sign is used to determine,is a reflected signal without distortion at the surface electromagnetic wave transmitter,is the base of the natural logarithm,is an imaginary unit of number and is,，is the propagation constant as a function of frequency,is the reflection coefficient;
step S62: collecting a cable reflected signal data set, wherein the data set consists of input data and a label, the input data comprises a damaged cable reflected signal with noise interference and a lossless cable reflected signal with noise interference, the label comprises a corresponding damaged cable reflected signal without noise interference and a corresponding lossless cable reflected signal without noise interference;
step S63: constructing a self-encoder model, wherein the self-encoder model consists of an encoder and a decoder;
step S64: using the cable reflection signal dataset training model, the encoder maps the input data into a low-dimensional representation vector, and the decoder restores the low-dimensional representation vector to a reconstructed estimated signal, the process being represented as follows:
；
；
in the method, in the process of the invention,is the input data of the data to be processed,is a low-dimensional representation vector that is,is the reconstruction of the estimated signal,andin order to activate the function,andthe weight matrices of the encoder and decoder respectively,andoffset vectors of the encoder and decoder, respectively;
step S65: the signal reconstruction error is calculated as follows:
；
in the method, in the process of the invention,is the error of the reconstruction of the signal,is the euclidean norm;
step S66: adopting self-adaptive moment estimation to carry out back propagation, and training a weight matrix and a bias vector of an encoder and a decoder;
step S67: presetting a mark of the completion of the training of the self-encoder model as a preset threshold, and repeating the steps S64 to S66 until the signal reconstruction error is smaller than the preset threshold;
step S68: the restored reflected signal A is used as input data, and is input into a self-encoder model after training, and the denoised reflected signal B is output.
Further, in step S7, the damage detection specifically includes the following steps:
step S71: and (3) carrying out convolution operation on the Kaiser window function and the denoising reflection signal B by adopting a window function technology to obtain a weighted reflection signal C, wherein the formula is as follows:
；
；
；
in the method, in the process of the invention,is the length of the window and,is an intermediate parameter that is used to determine the parameters,is a Kaiser window function that is used to determine the window,is a modified zero-order first class bessel function,is a parameter of the shape of the article,is to take a value of 0 to 0 in the time domainAt any one of the times (a),is the weighted reflected signal C, is a convolution operation,is the de-noised reflected signal B,is atTime of dayAndis a convolution operation of (1);
step S72: performing fast Fourier inverse transformation on the weighted reflection signal C, and converting the frequency domain response into a time domain response to obtain a spectrogram;
step S73: calculating the damage position of the sheath, according to the spectrogram, if the spectrogram has no abnormal jump, judging that the sheath has no damage, if the spectrogram has abnormal jump, judging that the sheath is damaged, and calculating the distance from the surface electromagnetic wave transmitter to the damage position of the sheath, wherein the formula is as follows:
；
in the method, in the process of the invention,is the distance from the surface electromagnetic wave emitter to the damage position of the sheath,is the distance between the surface electromagnetic wave and the back and forthThe time taken;
step S74: outputting a judging result of whether the sheath is damaged or not, and if the judging result is that the sheath is damaged, outputting the damaged position of the sheath additionally.
By adopting the scheme, the beneficial effects obtained by the invention are as follows:
(1) Aiming at the problems that in the traditional processing process of the ETC wire harness shielding wire, workers need to drag the wire skin by hands and the hand nerve fatigue of the workers is caused by long-time processing, the scheme designs the wire harness shielding wire protecting sleeve pushing and stretching device, so that the safety and reliability of the wire harness shielding wire protecting sleeve are improved, and the automatic and mechanical pushing and stretching processes are realized;
(2) After the needle is pushed and stretched by the protective sleeve, the problem of damage is detected by integrating the protective sleeve, and the FDR technology based on surface electromagnetic waves is adopted in the scheme to position the defects or damage on different distances on single conductor cables with different diameters, so that nondestructive damage detection on the cables is realized under the condition of no power on, the possibility of causing electrical safety problems to operators is greatly reduced, and the defect caused by destructive detection is effectively avoided;
(3) Aiming at the problems that the traditional FDR protective sleeve damage detection method causes artifacts due to noise and affects damage detection precision in a spectrogram of a reflected signal, the scheme adopts an autoreconder regression network to perform damage detection, distinguishes the reflected signal caused by damage, avoids interference of a frequency chart caused by noise, keeps the shape of the reflected signal, and ensures the quality of cable damage detection after pushing and stretching;
(4) The method comprises the steps that a surface electromagnetic wave emitter and a surface electromagnetic wave receiver are arranged on an elastic pressing block of a clamping jaw to emit reference signals and receive reflected signals;
(5) Through setting up the clamping block of clamping jaw and holding the upper plate B, the lower plate B of line clamping jaw, the stability of cable has been guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a push-pull device for a harness shielded wire protective sleeve according to the present invention;
fig. 2 is a schematic diagram of a pushing and stretching device for a protective sleeve of a wire harness shielding wire according to the present invention;
FIG. 3 is a top cross-sectional view of the guide rail of the present invention at motor slot height;
FIG. 4 is an enlarged view of a portion A of FIG. 2;
FIG. 5 is an enlarged view of a portion B of FIG. 4;
FIG. 6 is an enlarged view of a portion C of FIG. 4;
fig. 7 is a flow chart of a method for using the wire harness shielding wire protective sleeve pushing and stretching device according to the present invention.
Wherein, 1, a sliding track device, 11, a base, 12, a motor groove, 13, a guide track, 14, a roller A,15, a roller B,16, a belt, 17, a motor, 2, a front end sheath wire clamp, 21, a vertical plate, 22, a transverse plate, 23, a groove, 3, a clamping jaw, 31 and an upper clamping plate A,32, lower clamp plates A,33, clamping blocks, 34, elastic pressing blocks, 35, a surface electromagnetic wave transmitter, 36, a surface electromagnetic wave receiver, 4, a wire holding clamping jaw, 41, a sliding base, 42, upper clamp plates B, 43, lower clamp plates B,44, a wire stripping groove, 45, a stress meter, 5 and a control system.
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientation or positional relationships based on those shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Referring to fig. 1 to 6, the invention provides a push-pull device for a harness shielded wire protective sleeve, which comprises a sliding track device 1, a front end sheath wire clamp 2, a clamping jaw 3, a wire holding clamp claw 4 and a control system 5, wherein the sliding track device 1 is arranged on a horizontal plane, the front end sheath wire clamp 2 is fixedly arranged at one end of the sliding track device 1, the clamping jaw 3 is fixedly arranged at the other end of the sliding track device 1, and the control system 5 is fixedly arranged at the rear end of the clamping jaw 3;
the sliding track device 1 comprises a base 11, a motor groove 12, a guide track 13, a roller A14, a roller B15, a belt 16 and a motor 17, wherein the base 11 is placed on a horizontal plane, the guide track 13 is fixedly arranged on the upper wall of the base 11, the motor groove 12 is arranged in the guide track 13, the roller A14 is rotationally arranged at one end of the inner wall of the motor groove 12, the roller B15 is rotationally arranged at the other end of the inner wall of the motor groove 12, the belt 16 is arranged in the motor groove 12, two ends of the belt 16 are respectively fixedly connected with two side walls of the wire holding clamp claw 4, the middle part of the belt 16 is wound on the roller A14 and the roller B15, the motor 17 is fixedly arranged on the inner wall of the guide track 13, the output end of the motor 17 is coaxially and fixedly connected with the roller A14, and the motor 17 is electrically connected with the control system 5;
the front-end sheath wire clamp 2 comprises a vertical plate 21 and a transverse plate 22, wherein the lower end of the vertical plate 21 is fixedly arranged on the upper wall of the base 11, the transverse plate 22 is fixedly arranged on the upper end of the side wall of the vertical plate 21, and a groove 23 is formed in the upper end of the transverse plate 22;
the clamping jaw 3 is fixedly arranged at the other end of the base 11, an upper clamping plate A31 and a lower clamping plate A32 are arranged at the output end of the clamping jaw 3, a clamping block 33 is respectively and fixedly arranged on the lower wall of the upper clamping plate A31 and the upper wall of the lower clamping plate A32, an elastic pressing block 34 is respectively arranged on the lower wall of the upper clamping plate A31 and the upper wall of the lower clamping plate A32, the elastic pressing block 34 is arranged on one side, close to the wire holding jaw 4, of the clamping block 33, a surface electromagnetic wave emitter 35 and a surface electromagnetic wave receiver 36 are embedded on the elastic pressing block 34, and the surface electromagnetic wave emitter 35 and the surface electromagnetic wave receiver 36 are respectively and electrically connected with the control system 5;
the wire holding clamping jaw 4 is fixedly provided with a sliding base 41, the sliding base 41 is in sliding clamping connection with the guide rail 13, the output end of the wire holding clamping jaw 4 is provided with an upper clamping plate B42 and a lower clamping plate B43, the lower wall of the upper clamping plate B42 and the upper wall of the lower clamping plate B43 are respectively provided with a wire stripping groove 44, the bottom wall of the wire stripping groove 44 on the lower clamping plate B43 is provided with a stress meter 45, and the stress meter 45 is electrically connected with the input end of the control system 5;
aiming at the problems that ETC wire harness shielding wires are required to be pulled back by hands by workers and hand nerve fatigue of the workers is caused by long-time processing in the traditional processing process, the scheme designs the wire harness shielding wire protecting sleeve pushing and stretching device, the safety and the reliability of the wire harness shielding wire protecting sleeve are improved, and the automatic and mechanical pushing and stretching processes are realized.
Referring to fig. 1 to 7, the method for using the harness shielding wire protecting sleeve pushing and stretching device according to the above embodiment includes the following steps:
step S1: the cable is fixed, the insulated wire sleeved in the sheath is marked as a cable to be stretched, the front end of the cable to be stretched is placed into the groove 23 of the front end sheath wire clamp 2 to be fixed, the tail end of the cable to be stretched is fixed by the clamping block 33 of the clamping jaw 3, and the elastic pressing block 34 of the clamping jaw 3 is attached to the cable to be stretched;
step S2: the clamping jaw is controlled, the clamping control mode of the wire clamping jaw 4 adopts displacement control, the stress of the cable to be stretched is measured in real time by the stress meter 45, and the tail end of the cable to be stretched is clamped by the upper clamping plate B42 and the lower clamping plate B43;
step S3: the wire stripping operation, the control system 5 controls the motor 17 to drive the belt 16, and the wire holding clamping jaw 4 moves at a constant speed to push and stretch the cable to be stretched, so as to obtain a wire harness shielding wire;
step S4: transmitting a reference signal, the surface electromagnetic wave transmitter 35 transmitting the reference signal;
step S5: receiving the reflected signal, the surface electromagnetic wave receiver 36 receives the reflected signal;
step S6: denoising, namely building and training a self-encoder model, and denoising the reflected signal;
step S7: detecting damage, namely detecting whether the sheath of the wire harness shielding wire is damaged or not;
step S8: and (3) resetting the original point, loosening the front-end sheath wire clamp 2, the wire holding clamp claw 4 and the clamping claw 3, taking out the wire harness shielding wire, and enabling the wire holding clamp claw 4 to automatically move to an initial position.
Embodiment three, referring to fig. 1, 4, 6 and 7, based on the above embodiment, in step S2, the jaw control specifically includes the following steps:
step S21: the stress meter 45 measures the stress of the cable to be stretched in real time, and the mark of the completion of clamping by the clamp holding claw 4 is preset as the preset stress intensity;
step S22: when the stress measured by the stress meter 45 is equal to 0, the upper clamping plate B42 does not touch the cable to be stretched, and the wire holding clamp claw 4 clamps at a rated high speed;
step S23: when the stress measured by the stress meter 45 is not equal to 0, the upper clamping plate B42 is in contact with the cable to be stretched, and the cable to be stretched is stressed, at the moment, the wire holding clamp claw 4 clamps at a rated slow speed until the stress measured by the stress meter 45 reaches the preset stress intensity, the upper clamping plate B42 stops moving, and the wire holding clamp claw 4 reaches the clamping force for pushing and stretching the cable to be stretched;
the emission of the reference signal and the reception of the reflected signal are realized by arranging a surface electromagnetic wave emitter 35 and a surface electromagnetic wave receiver 36 on an elastic pressing block 34 of the clamping jaw 3; by arranging the clamping block 33 of the clamping jaw 3 and the upper clamping plate B42 and the lower clamping plate B43 of the wire holding jaw 4, the stability of the cable is ensured.
In step S4, reference signals are transmitted, specifically, the surface electromagnetic wave transmitter 35 transmits reference signals, and square sine signals are used as the transmitted reference signals, and the formula is as follows, referring to fig. 3, 5 and 7, which are based on the above embodiments:
；
in the method, in the process of the invention,is a square sine signal, which is used for generating a sine signal,is the cumulative sum of square sine signals for each step frequency,it is the propagation time that is set to be,is a rectangular window function with a fixed time span,is the total number of step frequency categories,is the reference frequency of the reference signal,is a sinusoidal function which is a function of the sine,is the resolution of the image to be processed,is the step frequency of the reference signal.
Fifth embodiment, referring to fig. 5 and 7, the embodiment is based on the above embodiment, and in step S6, the denoising process specifically includes the following steps:
step S61: distortion caused by attenuation and distortion in the process of transmitting the restored reflected signal, outputting a restored reflected signal A containing damage characteristics, and the calculation formula is as follows:
；
in the method, in the process of the invention,in order to locate the lesion,is a reflected signal that includes a lesion characterization,is a reflected signal without distortion at the surface electromagnetic wave emitter 35,is the base of the natural logarithm,is an imaginary unit of number and is,，is the propagation constant as a function of frequency,is the reflection coefficient;
step S62: collecting a cable reflected signal data set, wherein the data set consists of input data and a label, the input data comprises a damaged cable reflected signal with noise interference and a lossless cable reflected signal with noise interference, the label comprises a corresponding damaged cable reflected signal without noise interference and a corresponding lossless cable reflected signal without noise interference;
step S63: constructing a self-encoder model, wherein the self-encoder model consists of an encoder and a decoder;
step S64: using the cable reflection signal dataset training model, the encoder maps the input data into a low-dimensional representation vector, and the decoder restores the low-dimensional representation vector to a reconstructed estimated signal, the process being represented as follows:
；
；
in the method, in the process of the invention,is the input data of the data to be processed,is a low-dimensional representation vector that is,is the reconstruction of the estimated signal,andin order to activate the function,andthe weight matrices of the encoder and decoder respectively,andoffset vectors of the encoder and decoder, respectively;
step S65: the signal reconstruction error is calculated as follows:
；
in the method, in the process of the invention,is the error of the reconstruction of the signal,is the euclidean norm;
step S66: adopting self-adaptive moment estimation to carry out back propagation, and training a weight matrix and a bias vector of an encoder and a decoder;
step S67: presetting a mark of the completion of the training of the self-encoder model as a preset threshold, and repeating the steps S64 to S66 until the signal reconstruction error is smaller than the preset threshold;
step S68: the reduced reflection signal A is used as input data, and is input into a self-encoder model after training is completed, and a denoising reflection signal B is output;
aiming at the problems that the traditional FDR protective sleeve damage detection method causes artifacts due to noise and affects damage detection precision, the scheme adopts an autoreconder regression network to perform damage detection, distinguishes the reflected signals caused by damage, avoids interference of frequency diagrams caused by noise, keeps the shape of the reflected signals and ensures the quality of cable damage detection after pushing and stretching.
Embodiment six, referring to fig. 5 and 7, based on the above embodiment, in step S7, the damage detection specifically includes the following steps:
step S71: and (3) carrying out convolution operation on the Kaiser window function and the denoising reflection signal B by adopting a window function technology to obtain a weighted reflection signal C, wherein the formula is as follows:
；
；
；
in the method, in the process of the invention,is the length of the window and,is an intermediate parameter that is used to determine the parameters,is a Kaiser window function that is used to determine the window,is a modified zero-order first class scallopThe function of the sal function is that,is a parameter of the shape of the article,is to take a value of 0 to 0 in the time domainAt any one of the times (a),is the weighted reflected signal C, is a convolution operation,is the de-noised reflected signal B,is atTime of dayAndis a convolution operation of (1);
step S72: performing fast Fourier inverse transformation on the weighted reflection signal C, and converting the frequency domain response into a time domain response to obtain a spectrogram;
step S73: calculating the damage position of the sheath, according to the spectrogram, if the spectrogram has no abnormal jump, performing the following operation, and if the spectrogram has abnormal jump, calculating the distance from the surface electromagnetic wave emitter 35 to the damage position of the sheath, wherein the formula is as follows:
；
in the method, in the process of the invention,is the distance of the surface electromagnetic wave emitter 35 to the location of the sheath lesion,is the distance between the surface electromagnetic wave and the back and forthThe time taken;
step S74: outputting a judging result of whether the sheath is damaged or not, and outputting an additional damaged position of the sheath if the sheath is damaged;
after the needle is pushed and stretched by the protective sleeve, the problem of damage is detected to the integral protective sleeve, the FDR technology based on the surface electromagnetic waves is adopted in the scheme, the defect or damage on different distances on single conductor cables with different diameters is positioned, nondestructive damage detection on the cables is realized under the condition of no power on, the possibility of causing electrical safety problems to operators is greatly reduced, and the defect caused by destructive detection is effectively avoided.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (6)
1. The utility model provides a pencil shielded wire protective sheath promotes stretching device which characterized in that: the device comprises a sliding track device, a front-end sheath wire clamp, a clamping jaw, a wire holding clamping jaw and a control system, wherein the sliding track device is arranged on a horizontal plane; the sliding track device comprises a base, a motor groove, a guide track, a roller A, a roller B, a belt and a motor, wherein the base is arranged on a horizontal plane, the guide track is fixedly arranged on the upper wall of the base, the motor groove is formed in the guide track, the roller A is rotationally arranged at one end of the inner wall of the motor groove, the roller B is rotationally arranged at the other end of the inner wall of the motor groove, the belt is arranged in the motor groove, two ends of the belt are fixedly connected with two side walls of a wire holding clamp claw respectively, the middle part of the belt is wound on the roller A and the roller B, the motor is fixedly arranged on the inner wall of the guide track, the output end of the motor is coaxially and fixedly connected with the roller A, and the motor is electrically connected with a control system; the front-end sheath wire clamp comprises a vertical plate and a transverse plate, wherein the lower end of the vertical plate is fixedly arranged on the upper wall of the base, the transverse plate is fixedly arranged on the upper end of the side wall of the vertical plate, and a groove is formed in the upper end of the transverse plate; the clamping jaw is fixedly arranged at the other end of the base, an upper clamping plate A and a lower clamping plate A are arranged at the output end of the clamping jaw, clamping blocks are respectively and fixedly arranged on the lower wall of the upper clamping plate A and the upper wall of the lower clamping plate A, elastic pressing blocks are respectively arranged on the lower wall of the upper clamping plate A and the upper wall of the lower clamping plate A, the elastic pressing blocks are arranged on one side, close to the wire holding clamping jaw, of the clamping blocks, a surface electromagnetic wave emitter and a surface electromagnetic wave receiver are embedded on the elastic pressing blocks, and the surface electromagnetic wave emitter and the surface electromagnetic wave receiver are respectively and electrically connected with the control system; the wire holding clamping jaw is fixedly provided with a sliding base, the sliding base is connected to the guide rail in a sliding and clamping mode, the output end of the wire holding clamping jaw is provided with an upper clamping plate B and a lower clamping plate B, the lower wall of the upper clamping plate B and the upper wall of the lower clamping plate B are respectively provided with a wire stripping groove, the bottom wall of the wire stripping groove on the lower clamping plate B is provided with a stress meter, and the stress meter is electrically connected with the input end of the control system.
2. The application method of the wire harness shielding wire protective sleeve pushing and stretching device is applied to the wire harness shielding wire protective sleeve pushing and stretching device disclosed in claim 1, and is characterized in that: the using method of the wire harness shielding wire protective sleeve pushing and stretching device comprises the following steps of:
step S1: the cable is fixed, the insulated wire sleeved in the sheath is marked as a cable to be stretched, the front end of the cable to be stretched is placed into a groove of a sheath wire clamp at the front end to be fixed, the tail end of the cable to be stretched is fixed by using a clamping block of a clamping jaw, and an elastic pressing block of the clamping jaw is attached to the cable to be stretched;
step S2: the clamping jaw is controlled, the clamping control mode of the wire clamping jaw adopts displacement control, the stress of the cable to be stretched is measured in real time by a stress meter, and the tail end of the cable to be stretched is clamped by an upper clamping plate B and a lower clamping plate B;
step S3: carrying out wire stripping operation, wherein a control system controls a motor to drive a belt, and a wire holding clamp moves at a constant speed to push and stretch a cable to be stretched, so as to obtain a wire harness shielding wire;
step S4: transmitting a reference signal, wherein the surface electromagnetic wave transmitter transmits the reference signal;
step S5: receiving the reflected signal, and receiving the reflected signal by a surface electromagnetic wave receiver;
step S6: denoising, namely building and training a self-encoder model, and denoising the reflected signal;
step S7: detecting damage, namely detecting whether the sheath of the wire harness shielding wire is damaged or not;
step S8: and (3) resetting the original point, loosening the front-end sheath wire clamp, the wire holding clamping jaw and the clamping jaw, taking out the wire harness shielding wire, and enabling the wire holding clamping jaw to automatically move to an initial position.
3. The method for using the wire harness shielding wire protective sleeve pushing and stretching device according to claim 2, wherein the method comprises the following steps of: in step S2, the jaw control specifically includes the following steps:
step S21: the stress meter measures the stress of the cable to be stretched in real time, and a mark for clamping the cable by the clamp holding claw is preset as the preset stress intensity;
step S22: when the stress measured by the stress meter is equal to 0, the upper clamping plate B does not touch the cable to be stretched, and the clamp holding claw clamps at a rated high speed;
step S23: when the stress measured by the stress meter is not equal to 0, the upper clamping plate B is in contact with the cable to be stretched, the cable to be stretched is stressed, the wire holding clamp clamps clamp at the rated slow speed until the stress measured by the stress meter reaches the preset stress intensity, the upper clamping plate B stops moving, and the wire holding clamp clamps clamp force pushing the cable to be stretched.
4. A method of using a push-pull device for a harness shielded wire protective sleeve according to claim 3, wherein: in step S4, the reference signal is transmitted, specifically, the reference signal is transmitted by the surface electromagnetic wave transmitter, and a square sinusoidal signal is used as the reference signal to be transmitted, and the formula is as follows:
；
in the method, in the process of the invention,is a square sine signal, ">Is the cumulative sum of square sine signals of each step frequency,/->Is the propagation time, +.>Is a rectangular window function with a fixed time span, < >>Is the total number of step frequency categories>Is the reference frequency +.>Is a sine function +.>Is resolution->Is the step frequency of the reference signal.
5. The method for using the wire harness shielding wire protective sleeve pushing and stretching device according to claim 4, wherein the method comprises the following steps: in step S6, the denoising process specifically includes the following steps:
step S61: distortion caused by attenuation and distortion in the process of transmitting the restored reflected signal, outputting a restored reflected signal A containing damage characteristics, and the calculation formula is as follows:
；
in the method, in the process of the invention,for the injured position->Is a reflected signal comprising a lesion characterization, +.>Is a reflection signal without distortion at the surface electromagnetic wave transmitter, < >>Is the base of natural logarithm, < >>Is imaginary unit, ++>，/>Is a propagation constant with frequency, +.>Is the reflection coefficient;
step S62: collecting a cable reflected signal data set, wherein the data set consists of input data and a label, the input data comprises a damaged cable reflected signal with noise interference and a lossless cable reflected signal with noise interference, the label comprises a corresponding damaged cable reflected signal without noise interference and a corresponding lossless cable reflected signal without noise interference;
step S63: constructing a self-encoder model, wherein the self-encoder model consists of an encoder and a decoder;
step S64: using the cable reflection signal dataset training model, the encoder maps the input data into a low-dimensional representation vector, and the decoder restores the low-dimensional representation vector to a reconstructed estimated signal, the process being represented as follows:
；
；
in the method, in the process of the invention,is input data, < >>Is a low-dimensional representation vector, ">Is a reconstructed estimated signal, ">And->To activate the function +.>And->Weight matrix of encoder and decoder, respectively, < >>And->Offset vectors of the encoder and decoder, respectively;
step S65: the signal reconstruction error is calculated as follows:
；
in the method, in the process of the invention,is the signal reconstruction error, < >>Is the euclidean norm;
step S66: adopting self-adaptive moment estimation to carry out back propagation, and training a weight matrix and a bias vector of an encoder and a decoder;
step S67: presetting a mark of the completion of the training of the self-encoder model as a preset threshold, and repeating the steps S64 to S66 until the signal reconstruction error is smaller than the preset threshold;
step S68: the restored reflected signal A is used as input data, and is input into a self-encoder model after training, and the denoised reflected signal B is output.
6. The method for using the wire harness shielding wire protective sleeve pushing and stretching device according to claim 5, wherein the method comprises the following steps: in step S7, the damage detection specifically includes the following steps:
step S71: and (3) carrying out convolution operation on the Kaiser window function and the denoising reflection signal B by adopting a window function technology to obtain a weighted reflection signal C, wherein the formula is as follows:
；
；
；
in the method, in the process of the invention,is window length, +.>Is an intermediate parameter->Is a Kaiser window function, < >>Is a modified zero-order Bessel function of the first class,>is a shape parameter, +.>Takes a value of 0 to +.>Is>Is the weighted reflected signal C, is a convolution operation,/>Is the denoised reflected signal B, < >>Is at->Time->And->Is a convolution operation of (1);
step S72: performing fast Fourier inverse transformation on the weighted reflection signal C, and converting the frequency domain response into a time domain response to obtain a spectrogram;
step S73: calculating the damage position of the sheath, according to the spectrogram, if the spectrogram has no abnormal jump, judging that the sheath has no damage, if the spectrogram has abnormal jump, judging that the sheath is damaged, and calculating the distance from the surface electromagnetic wave transmitter to the damage position of the sheath, wherein the formula is as follows:
；
in the method, in the process of the invention,is the distance of the surface electromagnetic wave emitter to the damaged position of the sheath, < >>Is the distance between the electromagnetic waves on the surface>The time taken;
step S74: outputting a judging result of whether the sheath is damaged or not, and if the judging result is that the sheath is damaged, outputting the damaged position of the sheath additionally.
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