A system and method for detecting internal cracks in a prebaked anode carbon block

Abstract

The application discloses a kind of prebaked anode carbon block internal crack detection systems, including support frame, conveying mechanism and knocking mechanism;The top-up mechanism is below support frame, and the top-up mechanism can support carbon block and drive carbon block away from conveying mechanism;Knocking mechanism is configured as multiple groups, and multiple groups of knocking mechanism respectively knock different faces of carbon block;Detection system further includes computer;Knocking mechanism has probe that abuts carbon block, and probe receives vibration generated by carbon block when knocking mechanism knocks carbon block and converts vibration into sound transmission to computer.The detection system of the application utilizes conveying mechanism to transmit carbon block, and arranges knocking mechanism on three faces of carbon block respectively, and knocking mechanism can quickly knock the surface of carbon block, while knocking mechanism utilizes probe to accept the vibration of carbon block to drive internal vibration piece vibration air generation, and utilizes microphone to transmit to computer, so as to detect the internal crack condition of carbon block in this way, compared with artificial detection, detection effect is more accurate, and operation efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prebaked anode carbon block detection, and particularly relates to a prebaked anode carbon block internal crack detection system and a detection method based on the detection system. BACKGROUND

[0002] The prebaked anode is made of calcined petroleum coke as aggregate and coal tar pitch as binder, and is used as an anode material for an aluminum electrolysis cell. The product is first formed into a green body by vibration molding, and then is baked into a finished carbon block. The finished carbon block with internal cracks is prone to falling out of the electrolytic aluminum cell, even to falling out of the anode, which seriously affects the normal operation of the aluminum electrolysis cell, affects the product quality, and may also cause damage to the equipment. Due to the complexity of the baking electrode production process and raw materials, the cracks of the finished carbon block cannot be completely controlled by the process method at present, so it is necessary to strengthen the internal quality detection of the carbon block to prevent unqualified carbon blocks from flowing into the market.

[0003] In the prior art, the method for detecting the internal cracks of the finished carbon block is a manual hammering method, which detects the internal cracks of the finished carbon block by manually knocking the finished carbon block and listening to the sound with the ear. The mechanism of this method is that when the carbon block has internal cracks, the natural frequency changes, and the cracks increase the damping of the free vibration after hammering, so the sound of the carbon block with cracks after hammering is different from that of the normal carbon block. At present, this method requires a large number of detection personnel and occupies a lot of manpower.

[0004] Therefore, based on the above technical problems, the technical personnel in the field urgently need to develop an automatic carbon block internal quality detection system to ensure that the system can automatically and efficiently determine whether the internal quality of the carbon block is qualified and realize the detection of waste products. SUMMARY

[0005] The purpose of the present application is to provide an automatic machine hammering method voiceprint recognition system to detect the internal quality of the carbon block, and a prebaked anode carbon block internal crack detection system and a detection method based on the detection system, which can distinguish the carbon block with internal defects from the normal carbon block through the voiceprint.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme:

[0007] The prebaked anode carbon block internal crack detection system of the present application comprises:

[0008] a support frame;

[0009] a conveying mechanism for conveying the carbon block; and

[0010] a knocking mechanism capable of knocking the carbon block;

[0011] The support frame is provided with a jacking mechanism below the support frame, the jacking mechanism is capable of supporting the carbon block and driving the carbon block away from the conveying mechanism;

[0012] The knocking mechanism is configured in multiple groups, and the multiple groups of knocking mechanisms respectively knock different surfaces of the carbon block;

[0013] The detection system further comprises:

[0014] A computer;

[0015] The knocking mechanism is provided with a probe abutting against the carbon block, the probe receives the vibration generated by the carbon block when the knocking mechanism knocks the carbon block and converts the vibration into sound transmission to the computer.

[0016] Further, the support frame is configured as a frame structure;

[0017] The support frame is provided with a knocking mechanism mounting rack inside the support frame, and the knocking mechanism is assembled and fixed with the support frame through the knocking mechanism mounting rack;

[0018] The conveying mechanism is located at the lower part inside the support frame, and the conveying mechanism extends to the inside of the support frame in the horizontal direction;

[0019] The jacking mechanism is located below the conveying mechanism.

[0020] Further, the conveying mechanism comprises:

[0021] A track extending in the horizontal direction; and

[0022] A plurality of round rollers arranged at intervals along the extension direction of the track;

[0023] The carbon block is moved to the inside of the support frame through the round rollers;

[0024] The gap between adjacent round rollers serves as a moving space of the jacking mechanism.

[0025] Further, the knocking mechanism comprises:

[0026] A first mounting plate close to the knocking mechanism mounting rack of the support frame, the knocking mechanism is assembled and fixed with the knocking mechanism mounting rack through the hanger of the first mounting plate;

[0027] A second mounting plate; and

[0028] An electric hammer head and a knocking hydraulic cylinder fixed to the second mounting plate;

[0029] The knocking hydraulic cylinder is connected with the electric hammer head to control the action of the electric hammer head;

[0030] The knocking hydraulic cylinder is assembled with the first mounting plate at one end and with the second mounting plate at the other end;

[0031] The second mounting plate has a support rod and the probe extending towards the carbon block on the side facing the carbon block;

[0032] The knocking mechanism is three groups;

[0033] The three groups of the knocking mechanism are respectively located on the upper surface side, the short side edge side, and the long side edge side of the carbon block.

[0034] Further, the electric hammer head comprises:

[0035] The upper hammer shell and the lower hammer shell are fixedly assembled and hollowly formed into a mounting cavity inside;

[0036] The impact rod is integrated into the mounting cavity of the upper hammer shell, and the impact rod is sleeved with a restoring spring on the outer periphery;

[0037] The coil is integrated into the mounting cavity of the lower hammer shell, and the center of the coil is penetrated by a connecting rod;

[0038] One end of the connecting rod is connected with the impact rod, the other end of the connecting rod extends to the outside of the lower hammer shell along the axial direction of the lower hammer shell, and the end of the connecting rod extending to the outside of the lower hammer shell is provided with a hammer head;

[0039] The end of the lower hammer shell is closed by an end cover, and the connecting rod penetrates through the end cover;

[0040] The connection part of the connecting rod and the end cover is provided with a rubber ring sleeved on the outer periphery of the connecting rod;

[0041] The end of the impact rod away from the lower hammer shell is provided with a rubber pad, and the impact rod is separated from the upper hammer shell by the rubber pad;

[0042] One end of the restoring spring abuts against the rubber pad, and the other end of the restoring spring abuts against the coil;

[0043] When the impact rod drives the hammer head to extend outwards through the connecting rod, the impact rod compresses the restoring spring;

[0044] The impact rod is reset by the spring force of the restoring spring.

[0045] Further, the probe comprises:

[0046] The upper probe shell and the lower probe shell are fixedly assembled;

[0047] The lower probe shell is provided with a lower cover plate at one end away from the upper probe shell, and has a lower partition pad inside; a probe rod extending along the axial direction of the lower probe shell and partially extending to the outside of the lower probe shell is installed in the lower probe shell, and the probe rod is provided with a vibrating reed fixed in the lower probe shell at one end of the lower probe shell;

[0048] The probe rod abuts against the surface of the carbon block, and receives the vibration of the carbon block to drive the vibrating reed to vibrate and emit sound;

[0049] The inside of the connection part of the upper probe shell and the lower probe shell is provided with an upper partition pad;

[0050] The upper probe shell and the lower probe shell are provided with spring guide rods outside, and the spring guide rods are provided with return springs outside;

[0051] A conducting rod is installed in the upper probe shell;

[0052] A sound propagation channel is formed between the conducting rod and the vibrating reed;

[0053] A microphone is installed in the upper probe shell, the microphone is connected with the conducting rod, and soundproof cotton is filled between the microphone and the upper probe shell;

[0054] The microphone and the conducting rod are connected as a whole through a connecting pipe;

[0055] The upper probe shell is provided with an upper cover plate at one end away from the lower probe shell;

[0056] The microphone receives the sound generated by the vibrating reed and transmits the sound to the computer.

[0057] Further, the jacking mechanism comprises:

[0058] A mounting column extending in the vertical direction;

[0059] A jacking hydraulic cylinder located at the upper end of the mounting column; and

[0060] A supporting spring located at one end of the cylinder rod of the jacking hydraulic cylinder;

[0061] The jacking hydraulic cylinder drives the cylinder rod to drive the supporting spring to move from the moving space to the lower surface of the carbon block, and jacks up the carbon block to drive the carbon block to move away from the conveying mechanism and close to the knocking mechanism.

[0062] The application discloses a pre-baked anode carbon block internal crack detection method.

[0063] S101, through artificial screening, 50 normal carbon block samples are taken, 5 pieces of carbon block samples with layer cracking defect, longitudinal cracking defect and delamination defect are taken, the signals of three surfaces of the sample measured by the detection system are subjected to fast Fourier transform, the first three peak values of the amplitude in 0-2000HZ of each surface signal are taken, and the frequency is f i1 i2 i3 The corresponding amplitude is A i1 i2 i3 ;

[0064] Wherein i=1 is the upper surface signal, i=2 is the upper side signal, and i=3 is the short side signal;

[0065] S102, the data of the three surfaces are normalized respectively:

[0066]

[0067]

[0068] S103, the characteristic matrix of normal carbon block sample is ZC1-ZC 50 , and the characteristic matrix of defect carbon block sample is QX1-QC 15 ; The corresponding relationship is established as:

[0069]

[0070] S104, a neural network is established: the network is a classic BP neural network, which includes input, hidden layer and output layer;

[0071] Wherein, the input layer node receives the characteristic matrix, and each node accepts a characteristic parameter;

[0072] The output layer is the identification result, and the value is a numerical value between 0 and 1; "0" represents the worst defect quality, and "1" represents the best non-defect quality.

[0073] In the above technical scheme, the internal crack detection system and detection method of the prebaked anode carbon block provided by the application have the following beneficial effects:

[0074] The detection system of the application transmits the carbon block by the conveying mechanism, and arranges the knocking mechanism on the three surfaces of the carbon block, the knocking mechanism can quickly knock the surface of the carbon block, and the knocking mechanism uses the probe to receive the vibration of the carbon block to drive the internal vibration piece to vibrate the air, and the microphone transmits to the computer, so that the internal crack of the carbon block is detected in this way, compared with artificial detection, the detection effect is more accurate, and the work efficiency is higher.

[0075] ​​​​The detection system of the present application can avoid the contact between the conveying mechanism and the carbon block, thereby affecting the vibration effect after the knocking mechanism is knocked, so as to further improve the detection accuracy. The lifting mechanism capable of lifting the carbon block is integrated below, the support spring is used as the structure for lifting the carbon block, the interference of the vibration after the knocking is reduced, and the detection data is ensured to be accurate. BRIEF DESCRIPTION OF DRAWINGS

[0076] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0077] Figure 1 A structural schematic view of a prebaked anode carbon block internal crack detection system provided by the embodiment of the present application;

[0078] Figure 2 A structural schematic view of a knocking mechanism of a prebaked anode carbon block internal crack detection system provided by the embodiment of the present application;

[0079] Figure 3 A structural schematic view of a lifting mechanism of a prebaked anode carbon block internal crack detection system provided by the embodiment of the present application;

[0080] Figure 4 A structural sectional view of an electric hammer head of a prebaked anode carbon block internal crack detection system provided by the embodiment of the present application;

[0081] Figure 5 A structural sectional view of a probe of a prebaked anode carbon block internal crack detection system provided by the embodiment of the present application;

[0082] Figure 6 A neural network structure diagram of a prebaked anode carbon block internal crack detection method provided by the embodiment of the present application.

[0083] Explanation of reference signs:

[0084] 1, support frame; 2, knocking mechanism; 3, lifting mechanism; 4, conveying mechanism; 5, computer; 6, carbon block;

[0085] 101, knocking mechanism mounting frame;

[0086] 201, first mounting plate; 202, second mounting plate; 203, knocking hydraulic cylinder; 204, electric hammer head; 205, probe; 206, support rod; 207, lifting hook;

[0087] 301, mounting column; 302, lifting hydraulic cylinder; 303, support spring;

[0088] 401. Track; 402. Circular roller;

[0089] 20401, Upper hammer housing; 20402, Lower hammer housing; 20403, Coil; 20404, Connecting rod; 20405, Hammer head; 20406, Impact rod; 20407, Return spring; 20408, Rubber pad; 20409, End cap; 20410, Rubber ring;

[0090] 20501, Upper probe housing; 20502, Lower probe housing; 20503, Lower cover plate; 20504, Lower septum; 20505, Upper septum; 20506, Probe rod; 20507, Vibrating plate; 20508, Conducting rod; 20509, Microphone; 20510, Sound insulation cotton; 20511, Upper cover plate; 20512, Connecting tube; 20513, Spring guide rod; 20514, Return spring. Detailed Implementation

[0091] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0092] See Figures 1 to 5 As shown;

[0093] This embodiment provides a prebaked anode carbon block internal crack detection system, which includes:

[0094] Support frame 1;

[0095] The conveying mechanism 4 for conveying charcoal blocks 6; and

[0096] A striking mechanism 2 capable of striking the charcoal block 6;

[0097] The support frame 1 has a lifting mechanism 3 below it, which can support the charcoal block 6 and drive the charcoal block away from the conveying mechanism 4.

[0098] The striking mechanism 2 is configured as multiple sets, and the multiple sets of striking mechanisms 2 strike different sides of the carbon block 6 respectively.

[0099] The detection system also includes:

[0100] Computer 5;

[0101] The striking mechanism 2 has a probe 205 that abuts against the carbon block 6. The probe 205 receives the vibration generated by the carbon block 6 when the striking mechanism 2 strikes the carbon block 6 and converts the vibration into sound, which is then transmitted to the computer 5.

[0102] Specifically, this embodiment discloses a system for detecting internal cracks in prebaked anode carbon blocks. It mainly includes a support frame 1 as the main body, and a conveying mechanism 4, a striking mechanism 2, and a lifting mechanism 3 integrated at designated positions on the support frame 1. The striking mechanism 2 in this embodiment is generally divided into multiple groups based on actual testing experience, each corresponding to a different surface of the carbon block 6, thereby striking different positions on the carbon block 6 to comprehensively and accurately detect internal cracks. The striking mechanism 2 strikes the carbon block 6, causing it to vibrate. The aforementioned probe 205 receives this vibration and generates sound, which is transmitted to the computer 5. Finally, the computer 5's internal program calculates the result, thereby determining the internal crack condition of the carbon block 6.

[0103] Preferably, the support frame 1 in this embodiment is configured as a frame structure;

[0104] The support frame 1 has a striking mechanism mounting bracket 101 inside, and the striking mechanism 2 is assembled and fixed to the support frame 1 through the striking mechanism mounting bracket 101;

[0105] The conveying mechanism 4 is located in the lower part inside the support frame 1, and the conveying mechanism 4 extends horizontally into the interior of the support frame 1;

[0106] The lifting mechanism 3 is located below the conveying mechanism 4.

[0107] First, this embodiment defines the structure of the support frame 1 in detail. The support frame 1 in this embodiment is a steel structure frame. In order to install the striking mechanism 2 at a designated position, a striking mechanism mounting frame 101 is fixedly connected to the support frame 1. The corresponding striking mechanism 2 is assembled through the striking mechanism mounting frame 101, and the aforementioned conveying mechanism 4 is arranged inside the support frame 1. The conveying mechanism 4 in this embodiment can transport the carbon block 6 from the upstream process to the inside of the support frame 1 and place it in the working space of the striking mechanism 2.

[0108] Preferably, the conveying mechanism 4 in this embodiment includes:

[0109] Track 401 extends horizontally; and

[0110] Multiple circular rollers 402 are arranged at intervals along the extension direction of track 401;

[0111] The carbon block 6 is moved into the interior of the support frame 1 by the circular roller 402;

[0112] The gap between adjacent rollers 402 serves as the moving space for the lifting mechanism 3.

[0113] To facilitate the transfer of charcoal blocks 6, the conveying mechanism 4 in this embodiment includes a track 401 and a roller 402. Using the roller 402 for transfer can avoid damage to the charcoal blocks 6 and has a good transfer effect. The space between adjacent rollers 402 can also serve as the working space for the lifting mechanism 3. In particular, the striking mechanism 2 should not be disturbed by the conveying mechanism 4 when striking the charcoal blocks 6. Therefore, the lifting mechanism 3 needs to be integrated below the support frame 1. The lifting mechanism 3 can lift the charcoal blocks 6 to a certain height at a designated position, which can solve the interference problem of the conveying mechanism 4 and facilitate the operation of the striking mechanism 2.

[0114] Preferably, the striking mechanism 2 in this embodiment includes:

[0115] The first mounting plate 201 of the striking mechanism mounting bracket 101 is close to the support frame 1. The striking mechanism 2 is assembled and fixed to the striking mechanism mounting bracket 101 via the hook of the first mounting plate 201.

[0116] Second mounting plate 202; and

[0117] Electric hammer head 204 and striking hydraulic cylinder 203 fixed to the second mounting plate 202;

[0118] The hydraulic cylinder 203 is connected to the electric hammer head 204 to control the action of the electric hammer head 204.

[0119] One end of the striking hydraulic cylinder 203 is assembled with the first mounting plate 201, and the other end is assembled with the second mounting plate 202.

[0120] The second mounting plate 202 has a support rod 206 and a probe 205 extending toward the carbon block 6 on the side facing the carbon block 6;

[0121] In this embodiment, the striking mechanism 2 consists of three sets;

[0122] The three sets of striking mechanisms 2 are located on one side of the upper surface, one side of the short side, and one side of the long side of the carbon block 6, respectively.

[0123] The aforementioned electric hammer head 204 includes:

[0124] The upper hammer shell 20401 and lower hammer shell 20402 are assembled and fixed, and the hollow interior of the upper hammer shell 20401 and lower hammer shell 20402 forms an installation cavity.

[0125] An impact rod 20406 is integrated into the mounting cavity of the upper hammer shell 20401, and a restoring spring 20407 is sleeved on the outer periphery of the impact rod 20406;

[0126] A coil 20403 is integrated into the mounting cavity of the lower hammer housing 20402, and a connecting rod 20404 passes through the center of the coil 20403;

[0127] One end of the connecting rod 20404 is connected to the impact rod 20406, and the other end of the connecting rod 20404 extends along the axial direction of the lower hammer shell 20402 to the outside of the lower hammer shell 20402. A hammer head 20405 is installed at the end of the connecting rod 20404 that extends to the outside of the lower hammer shell 20402.

[0128] The end of the lower hammer housing 20402 is closed by the end cap 20409, and the connecting rod 20404 passes through the end cap 20409;

[0129] The connection between the connecting rod 20404 and the end cap 20409 has a rubber ring 20410 sleeved on the outer periphery of the connecting rod 20404;

[0130] A rubber pad 20408 is installed at the end of the impact rod 20406 away from the lower hammer shell 20402, and the impact rod 20406 is separated from the upper hammer shell 20401 by the rubber pad 20408.

[0131] One end of the restoring spring 20407 abuts against the rubber pad 20408, and the other end of the restoring spring 20407 abuts against the coil 20403;

[0132] When the impact rod 20406 drives the hammer head 20405 to extend outward through the connecting rod 20404, the impact rod 20406 compresses the recovery spring 20407.

[0133] The impact rod 20406 is reset by the spring force of the recovery spring 20407.

[0134] During operation, the pulse current of the electric hammer head 204 flows through the coil 20403, generating an electromagnetic force that causes the impact rod 20406, connecting rod 20404, and hammer head 20405 to move downwards at high speed, compressing the return spring 20407. The hammer head 20405 then strikes the surface of the carbon block 6 being tested. After the coil is de-energized, the electromagnetic force disappears, and the return spring 20407 pushes the impact rod 20406 back to its original position. The rubber pad 20408 at the bottom of the upper hammer housing 20401 acts as a buffer to prevent rigid impact.

[0135] Furthermore, the 205 probes available for hands-on use include:

[0136] The upper probe housing 20501 and the lower probe housing 20502 are assembled and fixed.

[0137] A lower cover plate 20503 is installed at the end of the lower probe housing 20502 away from the upper probe housing 20501. A lower septum 20504 is provided inside the lower probe housing 20502. A probe rod 20506 is installed inside the lower probe housing 20502, extending axially and partially extending to the outside of the lower probe housing 20502. A vibrating plate 20507 is fixed inside the lower probe housing 20502 at one end of the probe rod 20506.

[0138] The probe 20506 abuts against the surface of the carbon block 6, and the probe 20506 receives the vibration of the carbon block 6 to drive the vibrating plate 20507 to vibrate and emit sound;

[0139] The connection between the upper probe housing 20501 and the lower probe housing 20502 has an upper septum 20505 inside;

[0140] A spring guide rod 20513 is installed on the outside of the upper probe housing 20501 and the lower probe housing 20502, and a return spring 20514 is sleeved on the outside of the spring guide rod 20513.

[0141] A conductive rod 20508 is installed inside the upper probe housing 20501;

[0142] The conductive rod 20508 and the vibrating plate 20507 form a sound transmission channel;

[0143] A microphone 20509 is installed inside the upper probe housing 20501. The microphone 20509 is connected to the transmission rod 20508, and sound insulation cotton 20510 is filled between the microphone 20509 and the upper probe housing 20501.

[0144] The microphone 20509 and the conduction rod 20508 are connected as one unit through the connecting tube 20512;

[0145] The upper probe housing 20501 has an upper cover plate 20511 at the end away from the lower probe housing 20502;

[0146] Microphone 20509 receives the sound generated by vibrating plate 20507 and transmits it to computer.

[0147] When struck, the probe 20506 is placed against the carbon block 6 being tested. The vibration signal at that point on the carbon block 6 is transmitted through the probe 20506 to the vibrating plate 20507, causing the vibrating plate 20507 to vibrate. This vibrates the air between the upper cavity and the vibrating plate 20507, producing sound. The sound is received by the microphone 20509 and transmitted to the computer 5 for analysis and processing. The use of the probe 20506 filters out most of the noise in the environment, and the use of the sound insulation cotton 20510 and the connecting tube 20512 prevents noise from entering the microphone 20509, thus achieving the purpose of physical noise reduction.

[0148] In order to lift the carbon block 6, the lifting mechanism 3 includes:

[0149] Mounting post 301 extending vertically;

[0150] The lifting hydraulic cylinder 302 located at the upper end of the mounting column 301; and

[0151] A support spring 303 is located at one end of the cylinder rod of the lifting hydraulic cylinder 302;

[0152] The hydraulic cylinder 302 drives the cylinder rod to move the support spring 303 from the moving space to the lower surface of the carbon block 6, and lifts the carbon block 6 to drive the carbon block 6 away from the conveying mechanism 4 and closer to the striking mechanism 2.

[0153] The lifting mechanism 3 in this embodiment can detach the carbon block 6 from the conveying mechanism 4 and support it on the support spring 303. This can cut off the sound caused by the impact of the carbon block 6 from the conveying mechanism 4 and other structures connected to it, thus preventing interference noise to the sound signal. The carbon block 6 is supported on the support spring 303, making the carbon block 6 completely suspended. After being hammered, the carbon block 6 vibrates freely, making it easier to show the effect of cracks on vibration, thereby improving the detection sensitivity.

[0154] Secondly, based on the aforementioned detection system, this invention discloses a method for detecting internal cracks in prebaked anode carbon blocks. This detection method based on the prebaked anode carbon block internal crack detection system mainly includes the following steps:

[0155] S101. Through manual screening, 50 normal carbon block samples and 5 samples each of carbon blocks with defects to be identified, such as carbon blocks with delamination defects, longitudinal crack defects, and layering defects, are selected. The signals from the three surfaces of the samples measured by the detection system are subjected to Fast Fourier Transform (FFT). The top three peak values ​​of the amplitude within the range of 0-2000 Hz are selected from the signals of each surface. This frequency is denoted as f. i1 f i2 f i3 The corresponding amplitude is denoted as A. i1 A i2 A i3 ;

[0156] Where i=1 is the upper surface signal, i=2 is the upper side signal, and i=3 is the short side signal;

[0157] S102. Normalize the data for the three surfaces respectively:

[0158]

[0159]

[0160] These are the characteristic parameters of the carbon block, totaling 18.

[0161] The sample feature matrix is

[0162] S103, the feature matrix of normal carbon block samples is denoted as ZC1~ZC 50 The feature matrix of the defective carbon block samples is denoted as QX1~QC. 15 The corresponding relationship is established as follows:

[0163]

[0164] S104. Establish the neural network: The network is a classic BP neural network, which includes an input layer, a hidden layer, and an output layer.

[0165] In this process, each node in the input layer receives a feature matrix, and each node receives a feature parameter.

[0166] The output layer contains the recognition results, which are values ​​between 0 and 1; "0" represents the worst quality (defective) and "1" represents the best quality (no defects).

[0167] See Figure 6 As shown, the neural network is trained with the above correspondence (3) as the target value. After training, the correspondence between the input feature parameters and the output results of the carbon block is obtained. The carbon block to be tested is placed into this detection system, its feature matrix is ​​obtained, and it is input into the above neural network. The output value between 0 and 1 is calculated. The quality of the carbon block is quantitatively determined according to this value. The higher the value, the better the quality of the carbon block.

[0168] The present invention provides a system and method for detecting internal cracks in prebaked anode carbon blocks, which has the following beneficial effects:

[0169] The detection system of the present invention uses a conveying mechanism 4 to transport carbon block 6, and a striking mechanism 2 is arranged on three sides of the carbon block 6. The striking mechanism 2 can quickly strike the surface of the carbon block 6. At the same time, the striking mechanism 2 uses a probe 205 to receive the vibration of the carbon block 6 to drive the internal vibrating plate 20507 to vibrate the air and transmit the vibration to the computer 5 using a microphone 20509. Compared with manual detection, the detection effect of detecting internal cracks in the carbon block 6 in this way is more accurate and the work efficiency is higher.

[0170] In order to avoid the contact between the conveying mechanism 4 and the carbon block 6, which would affect the vibration effect after the striking mechanism 2 strikes, and to further improve the accuracy of the detection, the detection system of the present invention integrates a lifting mechanism 3 at the bottom that can lift the carbon block 6. The supporting spring 303 serves as the structure for lifting the carbon block 6, which can reduce the interference of vibration after striking and ensure accurate detection data.

[0171] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A system for detecting internal cracks in a prebaked anode carbon block, characterized by, The detection system comprises: a support frame (1); a conveying mechanism (4) for conveying the carbon block (6); and a knocking mechanism (2) capable of knocking the carbon block (6); The support frame (1) is provided with a jacking mechanism (3) below, which can support the carbon block (6) and drive the carbon block (6) away from the conveying mechanism (4); The knocking mechanism (2) is configured in multiple groups, and each group of the knocking mechanism (2) knocks a different face of the carbon block (6); The detection system further comprises: a computer (5); The knocking mechanism (2) is provided with a probe (205) abutting against the carbon block (6), which receives the vibration generated by the carbon block (6) when the knocking mechanism (2) knocks the carbon block and converts the vibration into sound transmission to the computer (5); The probe (205) comprises: an upper probe shell (20501) and a lower probe shell (20502) fixedly assembled; The lower probe shell (20502) is provided with a lower cover plate (20503) at one end away from the upper probe shell (20501), and has a lower spacer (20504) inside; a detection rod (20506) extending along the axial direction of the lower probe shell (20502) and partially extending to the outside of the lower probe shell (20502) is installed in the lower probe shell (20502), and the detection rod (20506) is provided with a vibration reed (20507) fixed in the lower probe shell (20502) at one end of the lower probe shell (20502); The detection rod (20506) abuts against the surface of the carbon block (6), and the detection rod (20506) receives the vibration of the carbon block (6) to drive the vibration reed (20507) to vibrate and emit sound; The inside of the connection between the upper probe shell (20501) and the lower probe shell (20502) is provided with an upper spacer (20505); The outer part of the upper probe shell (20501) and the lower probe shell (20502) is provided with a spring guide rod (20513), and the outer part of the spring guide rod (20513) is provided with a return spring (20514); The upper probe shell (20501) is provided with a conducting rod (20508); A sound propagation channel is formed between the conducting rod (20508) and the vibration reed (20507); The upper probe shell (20501) is provided with a microphone (20509), which is connected with the conducting rod (20508) and filled with sound insulation cotton (20510) between the microphone (20509) and the upper probe shell (20501); The microphone (20509) and the conducting rod (20508) are connected as a whole through a connecting pipe (20512); The upper probe shell (20501) is provided with an upper cover plate (20511) away from the lower probe shell (20502); The microphone (20509) receives the sound generated by the vibration reed (20507) and transmits it to the computer (5).

2. A system for detecting internal cracks in a prebaked anode carbon block according to claim 1, characterized in that, The support frame (1) is configured as a frame structure; The inside of the support frame (1) has a knocking mechanism mounting frame (101), and the knocking mechanism (2) is fixedly assembled with the support frame (1) through the knocking mechanism mounting frame (101); The conveying mechanism (4) is located at the lower part of the inside of the support frame (1), and extends horizontally to the inside of the support frame (1); The jacking mechanism (3) is located below the conveying mechanism (4).

3. A system for detecting internal cracks in a prebaked anode carbon block according to claim 2, characterized in that, The conveying mechanism (4) comprises: a track (401) extending horizontally; and a plurality of round rollers (402) arranged at intervals along the extension direction of the track (401); The carbon block (6) is moved to the inside of the support frame (1) through the round rollers (402); The gap between adjacent round rollers (402) serves as the moving space of the jacking mechanism (3).

4. The system for internal crack detection of a prebaked anode carbon block according to claim 1, wherein The knocking mechanism (2) comprises: a first mounting plate (201) close to the knocking mechanism mounting frame (101) of the support frame (1), the knocking mechanism (2) is fixedly assembled with the knocking mechanism mounting frame (101) through the hook (207) of the first mounting plate (201); a second mounting plate (202); and an electric hammer head (204) and a knocking hydraulic cylinder (203) fixed to the second mounting plate (202); The knocking hydraulic cylinder (203) is connected with the electric hammer head (204) to control the action of the electric hammer head (204); One end of the knocking hydraulic cylinder (203) is assembled with the first mounting plate (201), and the other end is assembled with the second mounting plate (202); The second mounting plate (202) has a support rod (206) extending towards the carbon block (6) and the probe (205) on the side facing the carbon block (6); The knocking mechanism (2) is three groups; Three groups of the knocking mechanism (2) are respectively located on the upper surface side, the short side edge side, and the long side edge side of the carbon block (6).

5. A system for detecting internal cracks in a prebaked anode carbon block according to claim 4, characterized in that, The electric hammer head (204) comprises: a fixedly assembled upper hammer shell (20401) and a lower hammer shell (20402), the inside of the upper hammer shell (20401) and the lower hammer shell (20402) is hollowly formed into a mounting cavity; an impact rod (20406) integrated into the mounting cavity of the upper hammer shell (20401), the outer periphery of the impact rod (20406) is sleeved with a restoring spring (20407); a coil (20403) integrated into the mounting cavity of the lower hammer shell (20402), the center of the coil (20403) is penetrated with a connecting rod (20404); One end of the connecting rod (20404) is connected with the impact rod (20406), the other end of the connecting rod (20404) extends to the outside of the lower hammer shell (20402) along the axial direction of the lower hammer shell (20402), and a hammer head (20405) is mounted at the end of the end portion of the connecting rod (20404) extending to the outside of the lower hammer shell (20402). The end of the lower hammer shell (20402) is closed by an end cover (20409), and the connecting rod (20404) penetrates the end cover (20409); The connecting rod (20404) is provided with a rubber ring (20410) sleeved on the outer periphery of the connecting rod (20404) at the connection position of the connecting rod (20404) and the end cover (20409); The end of the impact rod (20406) away from the lower hammer shell (20402) is provided with a rubber pad (20408), and the impact rod (20406) is separated from the upper hammer shell (20401) by the rubber pad (20408); One end of the restoring spring (20407) abuts against the rubber pad (20408), and the other end of the restoring spring (20407) abuts against the coil (20403); When the impact rod (20406) drives the hammer head (20405) to extend outward through the connecting rod (20404), the impact rod (20406) compresses the restoring spring (20407); The impact rod (20406) is reset by the spring force of the restoring spring (20407).

6. The system for internal crack detection of a prebaked anode carbon block according to claim 3, wherein The jacking mechanism (3) comprises: a mounting column (301) extending in a vertical direction; a jacking hydraulic cylinder (302) located at the upper end of the mounting column (301); and a supporting spring (303) located at one end of the cylinder rod of the jacking hydraulic cylinder (302); The jacking hydraulic cylinder (302) drives the cylinder rod to drive the supporting spring (303) to move from the moving space to the lower surface of the carbon block (6), and jacks up the carbon block (6) to drive the carbon block (6) away from the conveying mechanism (4) and close to the knocking mechanism (2).

7. A method for detecting internal cracks in a prebaked anode carbon block using the detection system according to any one of claims 1 to 6, characterized in that, The detection method of the prebaked anode carbon block internal crack detection system mainly comprises the following steps: S101, through artificial screening, taking 50 normal carbon block samples, 5 carbon block samples of layer cracking crack defect, 5 carbon block samples of longitudinal crack defect, 5 carbon block samples of delamination defect and other defect carbon block samples to be identified, the signals of the three surfaces of the samples measured by the detection system are subjected to fast Fourier transform, the top three peaks of the amplitude in 0-2000HZ of each surface signal are taken, the frequency is recorded as 、 、 , and the corresponding amplitude is recorded as 、 、 ; Wherein i=1 is the upper surface signal, i=2 is the upper side signal, and i=3 is the short side signal; S102, normalize the data of the three surfaces respectively: （1） （2） S103, the normal briquette sample feature matrix is denoted as The defect briquette sample feature matrix is denoted as The corresponding relationship is established as: （3） S104, establish a neural network: the network is a classic BP neural network, which includes input, hidden layer and output layer; The input layer nodes receive the feature matrix, and each node accepts a feature parameter; The output layer is the identification result, and the value is a numerical value between 0 and 1; "0" represents the worst quality with defects, and "1" represents the best quality without defects.

Images