On-line detection device and method for connection state of pin needle and round steel of cathode wire

Abstract

The present application relates to a kind of on-line detection device and method of the connection state of pin needle and round steel of cathode wire, belong to the field of the connection state detection of pin needle and round steel of cathode wire.Steel nail groove and round steel groove do not contact, there is conductive paste in steel nail groove, a lead wire in the tail of steel nail groove is connected in line board, the lead wire in the tail of steel nail groove in line board is connected in the two ends of constant current power supply.Signal processing module is connected with the lead wire in the two ends of constant current power supply, and the signal after processing is sent into industrial computer by data acquisition card.The voltage value generated by the contact resistance value of steel nail and round steel is used to judge whether the cathode wire lacks pin needle and the connection state of steel nail and round steel, and the detection reliability is good, the efficiency is high, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of detecting the connection status of the pin and round steel of a cathode wire, and particularly to an online detection device and method for the connection status of the pin and round steel of a cathode wire. Background Technology

[0002] The cathode wire is an important structural component of the electrostatic precipitator. The key to ensuring that the cathode wire has good rigidity and does not deform is to ensure that the cathode wire has continuous and stable discharge characteristics when energized.

[0003] To ensure the stability of the cathode wire, the cathode wire adopts a structure combining round steel and steel nails. There are two main production methods for this type of cathode wire: one is to drill holes in the round steel, pass the steel nails through the holes, and then hammer them in; the other is to weld the steel nails onto the round steel.

[0004] Whether it is the round hole hammering method or the welding method, there is a possibility of missing steel nails or weak connection. In particular, when welding steel nails to round steel, when the welding process parameters are unstable or the assembly accuracy is not high, it is easy to have unreliable welding or welding deviation. Therefore, how to detect missing nails or the connection status between round steel and steel nails is very important for the stability of the cathode wire.

[0005] Based on the processing cycle of cathode wire, the reserved inspection time is generally very short, and the high inspection efficiency makes comprehensive inspection quite difficult. Relying on manual inspection is difficult to meet production needs. Automated inspection methods primarily rely on visual inspection, but due to factors such as the high reflectivity of metal materials, the small size of steel nails, and low camera resolution, the accuracy rate for basic inspections such as whether a nail has fallen out is only 70%, which is insufficient for industrial production. Therefore, there is an urgent need to develop new online inspection methods. Summary of the Invention

[0006] The purpose of this invention is to provide an online detection device and method for the connection status of the cathode wire's pin and the round steel, solving the aforementioned problems existing in the prior art. This invention achieves online and comprehensive detection of the connection status of the cathode wire's pin and the round steel by acquiring and processing electrical signals in real time through a constant current power supply connected to a computer.

[0007] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0008] An online detection device for the connection status of cathode wire pins and round steel bars includes a round steel bar 1 fixed on a detection platform 11, a round steel bar 2 for the cathode wire placed inside the round steel bar 1, and the end of the round steel bar 2 in close contact with a conductive groove 10. The conductive groove 10 contains conductive paste 5 to ensure full contact between the conductive groove 10 and the round steel bar 2, eliminating contact resistance. Several pin placement grooves 4 correspond one-to-one with steel pins 3, and the pin placement grooves 4 and the round steel bar 1 are spaced apart to prevent direct contact. The steel pins 3 for the cathode wire are placed inside the pin placement grooves 4. Conductive grease 5 is placed to ensure full contact between the nail groove 4 and the steel nail 3, eliminating contact resistance; rubber block 6 is tightly integrated with the nail groove 4 and located at one end of the nail groove 4 near the round steel channel 1. Rubber block 6 is elastic; when the cathode wire is not placed on the detection platform 11, rubber block 6 bounces up to prevent conductive grease 5 from flowing out; when the cathode wire is placed on the detection platform 11, rubber block 6 is pressed down and makes close contact with the steel nail 3, ensuring that the part of the steel nail 3 in the nail groove 4 is completely wrapped by conductive grease 5, eliminating contact resistance.

[0009] The guide rail 7 supports the pin placement groove 4. When the distance between the steel pins 3 of the cathode wire changes, the spacing is adjusted with the cooperation of the slide groove 8 and the guide rail 7 to adapt to the detection of different types of cathode wires. The wire placement plate 9 and the slide groove 8 adopt an integrated structure. The pin placement groove 4 and the wire placement plate 9 are connected by a wire. One end of the wire is fixed to the pin placement groove 4, and the other end of the wire passes through the slide groove 8 and is connected to a wire inside the wire placement plate 9.

[0010] One end of the constant current power supply 12 is connected to the conductive groove 10, and the other end is connected to the power control module 13. The power control module 13 includes multiple power control cards, each of which is independently connected to a pin slot 4. Under the control of the industrial computer 16, the power control module 13 controls the circuit connection and disconnection between the constant current power supply 12 and each pin slot 4.

[0011] The signal processing module 14 includes multiple signal processing cards. One end of each signal processing card is independently connected to a nail slot 4, and the other end is connected to the conductive slot 10. Each signal processing card acquires the voltage signal of each steel nail circuit and sends it to the industrial computer 16 through the multi-channel signal acquisition module 15.

[0012] Another objective of this invention is to provide an online detection method for the connection status of the nail and the round steel in a cathode wire. The method determines whether the cathode wire is missing a nail and the connection status between the nail and the round steel by using the voltage value generated from the contact resistance between the nail 3 on the cathode wire and the round steel 2. The method includes the following steps:

[0013] Step 1: After the cathode wire is placed into the detection device, the industrial computer 16 starts the first power control card in the power control module 13 to turn on the constant current power supply 12. The current passes through the round steel 2 and forms a circuit with the first steel nail. The current conduction time is t.

[0014] Step 2: The first signal processing card in the signal processing module 14 acquires and processes the voltage signals at both ends of the conductive groove 10 and the first pin slot, and sends them to the industrial computer through the first channel in the multi-channel signal acquisition module 15.

[0015] Step 3: The industrial computer 16 starts the second power control card in the power control module 13 to turn on the constant current power supply 12. The current passes through the round steel 2 and forms a circuit with the second steel nail. The current conduction time is t.

[0016] Step 4: The second signal processing card in the signal processing module 14 acquires and processes the voltage signals at both ends of the conductive groove 10 and the second pin slot, and sends them to the industrial computer through the second channel in the multi-channel signal acquisition module 15.

[0017] Step 5: Based on the number of steel nails n on the cathode wire, repeat Step 1 and Step 2 to sequentially measure the voltage signals at both ends of the conductive groove 10 and the i-th nail slot, where i represents the serial number of a steel nail on a cathode wire.

[0018] Step 6: Process the voltage signal V between the conductive groove 10 and the i-th pin slot. i,j To prevent voltage instability during power-on, remove V. i,0 V i,1 …V i,m ...V i,(j-m) V i,(j-m+1) …V i,j Calculate the average voltage V at the middle j-2m interval, given a total of 2m voltage values. i,mean =(V i,(m+1) +V i,(m+2) +……+V i,(j-m-2)+ V i,(j-m-1) ) / (j-2m), V i,mean The voltage between the conductive groove of the cathode wire and the i-th steel nail; when V i,mean =0 indicates a missed weld or a missing screw; when V = 0, it indicates a missed weld or a missing screw. i,mean ≠0, indicating that there is a steel nail at this position, where j represents the j-th voltage sequence collected within the energizing time t, and the maximum value of j corresponds to the sampling rate of the multi-channel signal acquisition module 15;

[0019] Step 7: Voltage signal V of the i-th nail on the k-th cathode wire k,i,mean Statistically count the voltage of each nail on a total of k cathode wires; the voltage V of the first nail on the first cathode wire. 1,1,mean The voltage V of the second steel nail of the first cathode wire 1,2,mean The voltage V of the third steel nail of the first cathode wire 1,3,mean ...V of the i-th steel nail in the first cathode wire 1,i,mean The voltage V of the first steel nail of the second cathode wire2,1,mean The voltage V of the second steel nail of the second cathode wire 2,2,mean The voltage V of the third steel nail of the second cathode wire 2,3,mean ...V of the i-th steel nail in the second cathode wire 2,i,mean ; ...; Voltage V of the first steel nail of the k-th cathode wire k,1,mean The voltage V of the second steel nail of the kth cathode wire k,2,mean The voltage V of the third steel nail of the k-th cathode wire k,3,mean ...V of the i-th steel nail in the k-th cathode wire k,i,mean ;

[0020] Step 8: Obtain the contact area of ​​each steel nail i on the k cathode wires using X-ray detection or destructive testing methods. The contact area of ​​the i-th steel nail on the k-th cathode wire is S. k,i,mean The contact area of ​​the first steel nail of the first cathode wire is S. 1,1,mean The contact area of ​​the second steel nail of the first cathode wire is S. 1,2,mean The contact area of ​​the third steel nail of the first cathode wire is S. 1,3,mean ...The contact area of ​​the i-th steel nail of the first cathode wire is S 1,i,mean The contact area of ​​the first steel nail of the second cathode wire is S. 2,1,mean The contact area of ​​the second steel nail of the second cathode wire is S. 2,2,mean The contact area of ​​the third steel nail of the second cathode wire is S. 2,3,mean ...The contact area of ​​the i-th steel nail in the second cathode wire is S. 2,i,mean The contact area of ​​the first steel nail of the k-th cathode wire is S. k,1,mean The contact area of ​​the second steel nail of the k-th cathode wire is S. k,2,mean The contact area of ​​the third steel nail of the k-th cathode wire is S. k,3,mean ...The contact area of ​​the i-th steel nail of the k-th cathode wire is S. k,i,mean According to the requirements for using cathode wires, for contact areas greater than S min The steel nails are temporarily rated as qualified products, and their corresponding maximum voltage V zmax .

[0021] Step 9: Calculate the contact area S of the steel nails that are temporarily deemed acceptable among the k cathode wires mentioned above. k,i,mean >S min and the corresponding voltage signal V k,i,mean ,conduct Curve fitting, to improve detection quality, for the S below the curve... k,i,mean With V k,i,mean The point is discarded, and the maximum voltage above the curve is obtained again as V. max Then Vmax The threshold for qualified products;

[0022] Step 10: When the voltage V across the i-th steel nail of the cathode wire to be tested... h,i,mean <V max If the connection between the steel nail and the round steel is good, it is considered to be qualified.

[0023] The beneficial effects of this invention are as follows: This invention provides a device and method for detecting the connection status of the cathode wire's pin and round steel, solving the problem of the inability to detect the connection status of the cathode wire's pin and round steel. Especially for welded structures of round steel and steel pins, due to the extremely short welding process and the small contact area between the steel pin and the round steel, existing non-destructive testing methods such as ultrasonic testing and magnetic particle testing are not feasible. This invention can detect whether there is a missed weld or a missing pin after welding, while also detecting the contact status between the round steel and the steel pin, effectively improving detection efficiency while ensuring high detection accuracy. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate the invention and are used to explain it, but do not constitute an undue limitation of the invention.

[0025] Figure 1 This is a schematic diagram of the online detection device for the connection state between the cathode wire pin and the round steel of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of the online detection device for the connection state of the cathode wire pin and the round steel according to the present invention;

[0027] Figure 3 This is the display interface of the online detection system for the connection status of the cathode wire pin and the round steel of the present invention.

[0028] In the diagram: 1. Round steel channel; 2. Round steel; 3. Steel nail; 4. Nail placement groove; 5. Conductive grease; 6. Rubber block; 7. Guide rail; 8. Slide groove; 9. Cable placement plate; 10. Conductive channel; 11. Detection platform; 12. Constant current power supply; 13. Power control module; 14. Signal processing module; 15. Multi-channel signal acquisition module; 16. Industrial computer. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The following description, in conjunction with the accompanying drawings, uses a cathode wire detection method with a length of 960mm, a round steel diameter of 8mm, a steel nail diameter of 2mm, a steel nail length of 10mm, a steel nail spacing of 80mm on the same side, a spacing of 40mm on opposite sides, and 11 steel nails on each side. The current used is 1A, and the multi-channel signal acquisition module 15 is a 24-channel data acquisition card with a sampling rate of 1000Hz. This will further illustrate the detailed content and specific implementation of the present invention.

[0031] See Figures 1 to 3 As shown, the online detection device and method for the connection status of the cathode wire nail and round steel according to the present invention includes a round steel groove 1, a round steel 2, a steel nail 3, a nail placement groove 4, conductive grease 5, a rubber block 6, a guide rail 7, a sliding groove 8, a wire placement plate 9, a conductive groove 10, a detection platform 11, a constant current power supply 12, a power control module 13, a signal processing module 14, a multi-channel signal acquisition module 15, and an industrial computer 16. The nail placement groove 4 is not in contact with the round steel groove 1. The nail placement groove 4 contains conductive grease, and a lead wire in the wire placement plate 9 is connected to the tail of the nail placement groove 4. The two ends of the constant current power supply 12 are respectively connected to the lead wire in the round steel groove 1 and the lead wire in the wire placement plate 9 at the tail of the nail placement groove 4. The signal processing module 14 is connected to the lead wires at both ends of the constant current power supply 12, and sends the processed signal to the industrial computer through a data acquisition card. The present invention determines whether the cathode wire is missing a nail and the connection status of the steel nail and round steel by the voltage value generated by the contact resistance value between the steel nail and the round steel. The detection has good reliability, high efficiency, and low cost.

[0032] The round steel channel 1 is fixed on the detection platform 11 and is used to place the round steel 2 of the cathode wire. The end of the round steel 2 is in close contact with the conductive channel 10. The conductive channel 10 is filled with conductive paste 5 to ensure that the conductive channel 10 and the round steel 2 are in full contact and to eliminate the contact resistance in this part.

[0033] The nail groove 4 is made of non-conductive material. In this embodiment, plastic is used. The nail groove 4 is used to place the steel nail 3 of the cathode wire. The nail groove 4 is filled with conductive paste 5 to ensure that the nail groove 4 and the steel nail 3 are in full contact and to eliminate the contact resistance in this part.

[0034] The nail placement groove 4 contains a total of 22 nail placement grooves, which are marked as 4.1, 4.2, 4.3...4.22 respectively, corresponding one-to-one with the steel nails 3. The distance between the nail placement groove 4 and the round steel groove 1 is 3mm, and there is no physical contact point to prevent the two from directly contacting each other and affecting the reliability of the test results.

[0035] The rubber block 6 is integrated with the nail placement groove 4 and is located at one end of the nail placement groove 4 near the round steel groove 1. The rubber block 6 has a certain degree of elasticity. When the cathode wire is not placed on the detection platform 11, the rubber block 6 springs up to prevent the conductive paste 5 from flowing out; when the cathode wire is placed on the detection platform 11, the rubber block 6 is pressed down and comes into close contact with the steel nail 3, ensuring that the part of the steel nail 3 in the nail placement groove 4 is completely wrapped with conductive paste, eliminating the contact resistance of this part.

[0036] The guide rail 7 is used to support the nail slot 4. When the distance between the steel nails 3 of the cathode wire changes, the spacing can be adjusted with the cooperation of the slide groove 8 and the guide rail 7 to adapt to the detection of different types of cathode wires.

[0037] The wire placement plate 9 and the slide groove 8 adopt an integrated structure. The pin placement groove 4 and the wire placement plate 9 are connected by a wire. One end of the wire is fixed in the pin placement groove 4, and the other end of the wire passes through the slide groove 8 and is connected to a wire inside the wire placement plate 9.

[0038] One end of the constant current power supply 12 is connected to the conductive groove 10, and the other end is connected to the power control module 13.

[0039] The power control module 13 includes 22 power control cards, labeled 13.1, 13.2, 13.3...13.22 respectively. Each power control card is independently connected to a pin slot 4. Under the control of the industrial computer 16, the power control module 13 controls the circuit connection and disconnection between the constant current power supply 12 and each pin slot 4.

[0040] The signal processing module 14 comprises 22 signal processing cards, labeled 14.1, 14.2, 14.3...14.22. Each signal processing card has one end connected to a nail slot 4 and the other end connected to the conductive groove 10. Each signal processing card acquires the voltage signal of each nail circuit, which is then sent to the industrial computer 16 through 22 channels of the 24-channel signal acquisition module.

[0041] The method for detecting the connection status between the cathode wire pin and the round steel bar of the present invention includes the following steps:

[0042] Step 1: After the cathode wire is placed into this detection device, the industrial computer 16 starts the power control card 13.1 in the power control module 13 to turn on the constant current power supply 12. The current passes through the round steel 2 and forms a circuit with the first steel nail 3.1 on the cathode wire. The current conduction time is 0.2s.

[0043] Step 2: The signal processing card 14.1 in the signal processing module 14 acquires and processes the voltage signals at both ends of the conductive groove 10 and the pin slot 4.1, and sends them to the industrial computer 16 through the first channel of the 24-channel signal acquisition module.

[0044] Step 3: The industrial computer 16 starts the power control card 13.2 in the power control module 13, turning on the constant current power supply 12. The current flows through the round steel 2 and forms a circuit with the second steel nail 3.2 on the cathode wire. The current conduction time is 0.2s. The sampling rate of the multi-channel signal acquisition module 15 is set to 100Hz, so the number of voltages collected by each steel nail during the power-on time is 20.

[0045] Step 4: The signal processing card 14.2 in the signal processing module 14 acquires and processes the voltage signals at both ends of the conductive groove 10 and the pin slot 4.2, and sends them to the industrial computer 16 through the second channel in the 24-channel signal acquisition module 15.

[0046] Step 5: The number of steel nails on the cathode wire is 22. Repeat steps 1 and 2 to measure the voltage signals at both ends of the conductive groove 10 and the nail placement grooves 4.1 to 4.22 in sequence.

[0047] Step 6: Process the voltage signals across the conductive groove 10 and the nail slot 4.i (i takes values ​​1, 2, 3...21, 22). The voltage sequence across the i-th nail is V. i,j (Each steel nail's voltage is sampled 20 times) to prevent voltage instability at the moment of power-on; V is removed. i,0 V i,1 …V i,5 ...V i,16 V i,17 …V i,20 Calculate the average V of the middle 10 voltage values ​​from a total of 10 voltage values. i,mean =(V i,6 +V i,7 +……+V i,14+ V i,15 ) / (10), V i,mean Let V be the voltage across the conductive groove of the cathode wire and the i-th steel nail. When V i,mean =0 indicates a missed weld or a missing screw; when V = 0, it indicates a missed weld or a missing screw. i,mean ≠0 indicates that there is a steel nail at this location, where j represents the j-th voltage sequence collected within the energizing time t.

[0048] Step 7: Voltage signal V of the i-th steel nail on the k-th cathode wire k,i,mean The voltage of each nail on a total of 10 cathode wires was counted. The voltage V of the first nail on the first cathode wire was recorded. 1,1,mean The voltage V of the second steel nail of the first cathode wire 1,2,meanThe voltage V of the third steel nail of the first cathode wire 1,3,mean ...V of the i-th steel nail in the first cathode wire 1,i,mean The voltage V of the first steel nail of the second cathode wire 2,1,mean The voltage V of the second steel nail of the second cathode wire 2,2,mean The voltage V of the third steel nail of the second cathode wire 2,3,mean ...V of the i-th steel nail in the second cathode wire 2,i,mean ;...; Voltage V of the first steel nail of the 10th cathode wire 10,1,mean The voltage V of the second steel nail of the 10th cathode wire 10,2,mean The voltage V of the third steel nail of the 10th cathode wire 10,3,mean ...V of the i-th nail in the 10th cathode wire 10,i,mean .

[0049] Step 8: Obtain the contact area of ​​each steel nail i on the 10 cathode wires through destructive testing. The contact area of ​​the i-th steel nail on the k-th cathode wire is S. k,i,mean The contact area of ​​the first steel nail of the first cathode wire is S. 1,1,mean The contact area of ​​the second steel nail of the first cathode wire is S. 1,2,mean The contact area of ​​the third steel nail of the first cathode wire is S. 1,3,mean ...The contact area of ​​the i-th steel nail of the first cathode wire is S 1,i,mean The contact area of ​​the first steel nail of the second cathode wire is S. 2,1,mean The contact area of ​​the second steel nail of the second cathode wire is S. 2,2,mean The contact area of ​​the third steel nail of the second cathode wire is S. 2,3,mean ...The contact area of ​​the i-th steel nail in the second cathode wire is S. 2,i,mean The contact area of ​​the first steel nail of the 10th cathode wire is S. 10,1,mean The contact area of ​​the second steel nail of the 10th cathode wire is S. 10,2,mean The contact area of ​​the third steel nail of the 10th cathode wire is S. 10,3,mean ...The contact area of ​​the i-th nail in the 10th cathode wire is S. 10,i,mean Based on the requirements for using the cathode wires, a statistical analysis was conducted on 220 steel nails across 10 cathode wires. For those with a contact area greater than 2.6 mm², [the analysis focused on]... 2 Of the 205 steel nails, 205 were temporarily rated as qualified products, with a maximum voltage of 1.36V.

[0050] Step 9: Calculate the contact area S of the 205 qualified steel nails mentioned above. k,i,mean and the corresponding voltage signal V k,i,mean ,conduct Curve fitting, to improve detection quality, for the S below the curve... k,i,mean With V k,i,mean Discarding the point and obtaining the maximum voltage above the curve again, which is 1.32V, then 1.32V is the threshold for qualified products.

[0051] Step 10: When the voltage across the i-th steel nail on the new cathode wire is 0... <V h,i,mean If the value is less than 1.32, the connection between the steel nail and the round steel is considered to be good, and it is deemed to be qualified.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made to the present invention should be included within the scope of protection of the present invention.

Claims

1. An online detection device for the connection state of a cathode wire pin and a round steel bar, characterized in that: A round steel channel (1) is fixed on the testing platform (11). A round steel (2) for the cathode wire is placed inside the round steel channel (1). The end of the round steel (2) is in close contact with the conductive channel (10). The conductive channel (10) is filled with conductive paste (5) to ensure that the conductive channel (10) and the round steel (2) are in full contact and to eliminate contact resistance. Several nail slots (4) correspond one-to-one with steel nails (3). There is a gap between the nail slots (4) and the round steel channel (1) to prevent them from directly contacting each other. A steel nail (3) for the cathode wire is placed inside the nail slots (4). The nail slots (4) are filled with conductive paste (5) to ensure that the conductive channel (10) and the round steel (2) are in full contact and to eliminate contact resistance. The nail groove (4) is in full contact with the steel nail (3) to eliminate contact resistance; the rubber block (6) is tightly integrated with the nail groove (4) and is located at one end of the nail groove (4) near the round steel channel (1). The rubber block (6) is elastic; when the cathode wire is not placed on the detection platform (11), the rubber block (6) bounces up to prevent the conductive paste (5) from flowing out; when the cathode wire is placed on the detection platform (11), the rubber block (6) is pressed down and in close contact with the steel nail (3) to ensure that the part of the steel nail (3) in the nail groove (4) is completely wrapped by the conductive paste (5) to eliminate contact resistance. The signal processing module (14) includes multiple signal processing cards. One end of each signal processing card is independently connected to a pin slot (4), and the other end is connected to a conductive slot (10). Each signal processing card acquires the voltage signal of each steel nail circuit and sends it to the industrial computer (16) through the multi-channel signal acquisition module (15).

2. The online detection device for the connection state of the cathode wire pin and the round steel according to claim 1, characterized in that: The guide rail (7) supports the pin placement groove (4). When the distance between the steel pins (3) of the cathode wire changes, the spacing is adjusted with the cooperation of the slide groove (8) and the guide rail (7) to adapt to the detection of different types of cathode wires. The wire placement plate (9) and the slide groove (8) adopt an integrated structure. The pin placement groove (4) and the wire placement plate (9) are connected by a wire. One end of the wire is fixed in the pin placement groove (4), and the other end passes through the slide groove (8) and is connected to a wire in the wire placement plate (9).

3. The online detection device for the connection state of the cathode wire pin and the round steel according to claim 1, characterized in that: One end of the constant current power supply (12) is connected to the conductive groove (10), and the other end is connected to the power control module (13). The power control module (13) includes multiple power control cards, each power control card is independently connected to a pin slot (4). Under the control of the industrial computer (16), the power control module (13) controls the circuit connection and disconnection between the constant current power supply (12) and each pin slot (4).

4. An online detection method for the connection state of the cathode wire's pin and round steel, implemented using the online detection device for the connection state of the cathode wire's pin and round steel as described in claim 3, characterized in that: The voltage value generated by the contact resistance between the steel nail (3) on the cathode wire and the round steel (2) is used to determine whether the cathode wire is missing a nail and the connection status between the steel nail and the round steel; including the following steps: Step 1: When the cathode wire is placed into the detection device, the industrial computer (16) starts the first power control card in the power control module (13) to turn on the constant current power supply (12). The current passes through the round steel (2) and forms a circuit with the first steel nail. The current conduction time is t. Step 2: The first signal processing card in the signal processing module (14) acquires and processes the voltage signals at both ends of the conductive groove (10) and the first pin slot, and sends them to the industrial computer through the first channel in the multi-channel signal acquisition module (15). Step 3: The industrial computer (16) starts the second power control card in the power control module (13) to turn on the constant current power supply (12). The current passes through the round steel (2) and forms a circuit with the second steel nail. The current conduction time is t. Step 4: The second signal processing card in the signal processing module (14) acquires and processes the voltage signals at both ends of the conductive groove (10) and the second pin slot, and sends them to the industrial computer through the second channel in the multi-channel signal acquisition module (15). Step 5: Based on the number of steel nails n on the cathode wire, repeat Step 1 and Step 2 to measure the voltage signal at both ends of the conductive groove (10) and the i-th nail slot in sequence, where i represents the serial number of a steel nail on a cathode wire; Step 6: Process the voltage signal V between the conductive groove (10) and the i-th pin slot. i,j To prevent voltage instability during power-on, remove V. i,0 V i,1 …V i,m ...V i,(j-m) V i,(j-m+1) …V i,j Calculate the average voltage V at the middle j-2m interval, given a total of 2m voltage values. i,mean =( V i,（m+1） + V i,（m+2） +……+ V i,（j-m-2）+ V i,（j-m-1） ) / (j-2m)V i,mean The voltage between the conductive groove of the cathode wire and the two ends of the i-th steel nail; when V i,mean When V = 0, it indicates a missed weld or a missing screw. i,mean ≠0, indicating that there is a steel nail at this position, where j represents the j-th voltage sequence collected within the energizing time t, and the maximum value of j corresponds to the sampling rate of the multi-channel signal acquisition module (15); Step 7: Voltage signal V of the i-th nail on the k-th cathode wire k,i,mean Statistically count the voltage of each nail on a total of k cathode wires; the voltage V of the first nail on the first cathode wire. 1,1,mean The voltage V of the second steel nail of the first cathode wire 1,2,mean The voltage V of the third steel nail of the first cathode wire 1,3,mean ...V of the i-th steel nail in the first cathode wire 1,i,mean The voltage V of the first steel nail of the second cathode wire 2,1,mean The voltage V of the second steel nail of the second cathode wire 2,2,mean The voltage V of the third steel nail of the second cathode wire 2,3,mean ...V of the i-th steel nail in the second cathode wire 2,i,mean ; ...; Voltage V of the first steel nail of the k-th cathode wire k,1,mean The voltage V of the second steel nail of the kth cathode wire k,2,mean The voltage V of the third steel nail of the k-th cathode wire k,3,mean ...V of the i-th steel nail in the k-th cathode wire k,i,mean ; Step 8: Obtain the contact area of ​​each steel nail i on the k cathode wires using X-ray detection or destructive testing methods. The contact area of ​​the i-th steel nail on the k-th cathode wire is S. k,i,mean The contact area of ​​the first steel nail of the first cathode wire is S. 1,1,mean The contact area of ​​the second steel nail of the first cathode wire is S. 1,2,mean The contact area of ​​the third steel nail of the first cathode wire is S. 1,3,mean ...The contact area of ​​the i-th steel nail of the first cathode wire is S 1,i,mean The contact area of ​​the first steel nail of the second cathode wire is S. 2,1,mean The contact area of ​​the second steel nail of the second cathode wire is S. 2,2,mean The contact area of ​​the third steel nail of the second cathode wire is S. 2,3,mean ...The contact area of ​​the i-th steel nail in the second cathode wire is S. 2,i,mean The contact area of ​​the first steel nail of the k-th cathode wire is S. k,1,mean The contact area of ​​the second steel nail of the k-th cathode wire is S. k,2,mean The contact area of ​​the third steel nail of the k-th cathode wire is S. k,3,mean ...The contact area of ​​the i-th steel nail of the k-th cathode wire is According to the requirements for using cathode wires, for contact areas greater than The steel nails have been temporarily assessed as qualified products, and their corresponding maximum voltage... ; Step 9: Calculate the contact area of ​​the steel nails that are temporarily deemed acceptable among the k cathode wires mentioned above. and the corresponding voltage signal ,conduct Curve fitting is used to improve detection quality, specifically for the area below the curve. and The point is discarded, and the maximum voltage above the curve is obtained again. ,but The threshold for qualified products; Step 10: When the voltage across the i-th steel nail of the cathode wire to be tested... If the connection between the steel nail and the round steel is good, it is considered to be qualified.

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