A device for measuring resistivity in the auxiliary material region of a graphitization furnace

Abstract

The present application relates to the technical field of graphitization furnace, in particular to a kind of for graphitization furnace auxiliary material area resistivity device, including resistivity measuring instrument body, the top of the resistivity measuring instrument body is provided with detection assembly, the detection assembly includes test cylinder, the top of the test cylinder is connected with flexible hose, the top of the flexible hose is fixedly connected with four first sealing plates, the inner chamber of the test cylinder is fixedly connected with four fixed plates, the two sides of the fixed plate are rotatably connected with rotating rod, the outer surface of the rotating rod is fixedly connected with connecting plate.The present application realizes the quantitative evaluation of the quality of loading furnace by detection assembly, converts the traditional dependence on artificial experience and the fuzzy judgment of " whether resistance material is filled uniformly " into objective and assessable index based on the resistivity value and its fluctuation range of multiple points (such as 9 points or 18 points), so that the quality of loading furnace has traceability and manageability.

Description

Technical Field

[0001] This invention relates to the field of graphitization furnace technology, and more specifically to a resistivity measuring device for the auxiliary material area of ​​a graphitization furnace. Background Technology

[0002] Inspection equipment for the stacking structure of graphitization furnace auxiliary materials typically includes various specialized inspection systems for real-time monitoring of the distribution of auxiliary materials, prevention of current deviation, and ensuring the uniformity of the graphitization process. Among these, machine vision-based image recognition devices can perform non-contact three-dimensional scanning and analysis of the material stack shape, thickness, and coverage uniformity; infrared thermal imaging or infrared sensing systems can dynamically capture the temperature field distribution within the furnace, indirectly reflecting the uniformity of the conductivity and thermal conductivity of the auxiliary materials, and providing timely warnings of potential hot spots or cold zones. Furthermore, supporting offline sampling and analysis equipment is also crucial; for example, X-ray diffractometers (XRD) can be used to accurately determine the degree of graphitization and lattice parameters (such as dx) of samples. 002 Raman spectroscopy assesses the structural order and defect density of carbon materials by measuring the intensity ratio of the D peak to the G peak (Iᴅ / Iɢ). Some advanced production lines also integrate near-infrared spectroscopy (NIR) or laser-induced breakdown spectroscopy (LIBS) to rapidly screen auxiliary material components (such as ash content and metallic impurity content). These multimodal detection methods work synergistically to comprehensively evaluate the uniformity of auxiliary materials and products in terms of crystal structure, chemical composition, and physical distribution. They also provide data support for process parameter optimization, furnace loading adjustments, and quality traceability, thereby significantly improving graphitization efficiency, product consistency, and overall production safety.

[0003] Traditional graphitization furnaces use calcined petroleum coke as a resistive material between the furnace body and the sidewalls to isolate the current. Although commercially available graphitization furnaces vary in length (typically 10–50 meters), their operating principles are similar. In actual operation, newly purchased calcined petroleum coke has poor resistivity uniformity and a large fluctuation range. If used directly in the sidewall area, it can easily lead to uneven current distribution and cause current deviation: current concentrates in areas with lower resistance, causing a sudden rise in local temperature, forming "hot spots," and ultimately causing the sidewalls to burn out or even break down. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a resistivity measuring device for the auxiliary material area of ​​a graphitization furnace. This device effectively solves the problem that in traditional graphitization furnaces, calcined petroleum coke is filled between the furnace body and the sidewalls as resistivity material. Although the furnace lengths vary (10–50 meters), the principle is basically the same. However, the resistivity of newly purchased calcined coke fluctuates greatly and has poor uniformity. When used in the sidewalls, it easily causes current deviation, leading to overheating in the low-resistivity area and the formation of "hot spots," resulting in sidewall burn-out or even breakdown.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a resistivity measuring device for the auxiliary material area of ​​a graphitization furnace, comprising a resistivity measuring instrument body, a detection component on the top of the resistivity measuring instrument body, the detection component including a test cylinder, a telescopic flexible tube connected to the top of the test cylinder, four first sealing plates fixedly connected to the top of the telescopic flexible tube, four fixing plates fixedly connected to the inner cavity of the test cylinder, rotating rods rotatably connected to both sides of each fixing plate, connecting plates fixedly connected to the outer surface of each rotating rod, second sealing plates fixedly connected to the top of each connecting plate, a junction box mounted on the top of the resistivity measuring instrument body, and a steel pipe fixedly connected to the bottom of the junction box.

[0007] Furthermore, the resistivity measuring instrument body has four voltage lines installed at its terminals. One end of each voltage line passes through the inner cavity of the test tube, and a detection component is installed at the other end of each voltage line.

[0008] Furthermore, a placement box is fixedly connected to the top of the junction box, and a first mounting box is fixedly connected to the inner cavity of the placement box. Two operating rods are rotatably connected to the inner cavity of the first mounting box.

[0009] Furthermore, the outer surfaces of the two operating rods are respectively equipped with synchronous pulleys, and the two synchronous pulleys are connected by a synchronous belt drive. The top end of the operating rod penetrates the outer side of the inner cavity of the first mounting box, and a transmission cam is fixedly connected to the outer surface of the operating rod.

[0010] Furthermore, fixed long rods are slidably connected to both sides of the inner cavity of the placement box, and guide rods are fixedly connected to the outer surface of the fixed long rods.

[0011] Furthermore, positioning plates are fixedly connected to both sides of the inner cavity of the placement box, a spring is connected to one side of the positioning plate, one end of the spring is connected to a fixed long rod, and a push rod is fixedly connected to the top of the fixed long rod.

[0012] Furthermore, a guide frame is fixedly connected to the outer surface of the rotating rod, one side of the guide frame is movably connected to the push rod, and several horizontal plates are fixedly connected to the inner cavity of the test cylinder.

[0013] Furthermore, a sliding rod is fixedly connected to one side of the horizontal plate, and one end of the sliding rod is fixedly connected to a fixed long rod.

[0014] Furthermore, a second mounting box is fixedly connected to the inner cavity of the placement box, and a round rod is provided through the inner cavity of the second mounting box. One end of the round rod and the running rod are respectively fixedly connected to a transmission bevel gear, and the two transmission bevel gears mesh with each other.

[0015] Furthermore, a third mounting box is fixedly connected to the inner cavity of the placement box, and a worm gear is provided through the inner cavity of the third mounting box. A worm wheel is fixedly connected to the outer surface of the round rod, and the worm wheel and the worm gear mesh with each other. A protective plate is bolted to one side of the placement box.

[0016] Beneficial effects

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] I. This invention achieves quantitative assessment of furnace loading quality through a detection component. It transforms the traditional, unquantifiable judgment of "whether the resistive material is uniformly loaded"—relying on manual experience—into an objective and measurable indicator based on resistivity values ​​and their fluctuation range at multiple points (e.g., 9 or 18 points). This makes furnace loading quality traceable and manageable. The detection component's transmission cam, fixed rod, and second sealing plate work together to form a localized insulating shield as the probes are simultaneously inserted into the material. This enables, for the first time, precise measurement of the resistive material's volume resistivity over a small area on-site, effectively overcoming the shortcomings of the conventional four-probe method, which is susceptible to interference from surrounding materials due to the large measurement area.

[0019] Second, this invention can quickly complete multi-point resistivity detection within the furnace during the critical window period after loading but before power is supplied. Once excessive resistivity fluctuations are detected in a certain area, rework and adjustments can be made immediately (such as changing materials or re-compacting), fundamentally transforming passive post-processing furnace burning into proactive pre-processing control. It accurately locates areas with high rates of abnormality (such as near the electrodes or corner areas), providing data support for optimizing the resistivity material ratio or insulation structure, thereby significantly extending the furnace life and reducing maintenance costs. In addition, the dimensions of each component can be flexibly adjusted according to the electrode layout and material particle size of different furnace types (such as box furnaces and Acheson furnaces), possessing good industry scalability and convenient on-site maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the detection component of the present invention;

[0023] Figure 3This is a three-dimensional side view sectional view of the placement box structure of the present invention;

[0024] Figure 4 This is a three-dimensional side view cross-sectional diagram of the test cylinder structure of the present invention;

[0025] Figure 5 This is a three-dimensional schematic diagram of the first sealing plate structure of the present invention;

[0026] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0027] Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B;

[0028] Figure 8 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C;

[0029] Figure 9 This is a three-dimensional schematic diagram of the second sealing plate structure of the present invention;

[0030] Figure 10 This is a three-dimensional schematic diagram of the transmission cam structure of the present invention;

[0031] Figure 11 This is a three-dimensional schematic diagram of the operating rod structure of the present invention.

[0032] Reference numerals: 1. Resistivity meter body; 2. Detection component; 21. Test cylinder; 22. First sealing plate; 23. Fixing plate; 24. Rotating rod; 25. Connecting plate; 26. Second sealing plate; 27. Telescopic hose; 28. Junction box; 29. ​​Placement box; 210. First mounting box; 211. Running rod; 212. Synchronous pulley; 213. Transmission cam; 214. Fixed long rod; 215. Guide top rod; 216. Positioning plate; 217. Spring; 218. Push rod; 219. Guide running frame; 220. Horizontal plate; 221. Slide rod; 222. Second mounting box; 223. Round rod; 224. Transmission bevel gear; 225. Third mounting box; 226. Worm gear; 227. Worm wheel; 228. Steel pipe; 229. Voltage line; 230. Protective plate; 231. Detection component. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to embodiments.

[0035] See attached document Figure 1-11 A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace includes a resistivity measuring instrument body 1. A detection component 2 is provided on the top of the resistivity measuring instrument body 1. The resistivity measuring instrument body 1 is preferably a commercially available four-probe resistivity measuring instrument. The detection component 2 includes a test cylinder 21, which is made of stainless steel. A telescopic hose 27 is connected to the top of the test cylinder 21. The telescopic hose 27 is made of high temperature and corrosion resistant material, for example, by adding a high temperature and corrosion resistant coating and using high temperature resistant materials. Four first sealing plates 22 are fixedly connected to the top of the telescopic hose 27.

[0036] See attached document Figure 2-11 The inner cavity of the test cylinder 21 is fixedly connected to four fixing plates 23. Rotating rods 24 are rotatably connected to both sides of each fixing plate 23. Connecting plates 25 are fixedly connected to the outer surface of the rotating rods 24. A second sealing plate 26 is fixedly connected to the top of the connecting plate 25. The first sealing plate 22 and the second sealing plate 26 together form a cone shape. The cone shape facilitates material insertion. The cone surface is divided into eight fan-shaped sections, four of which are fixed and four are rotatable. The cone is opened and closed by rotating the detection component 2. A junction box 28 is installed on the top of the resistivity meter body 1. The junction box 28 is made of stainless steel for current and voltage measurement. A steel pipe 228 is fixedly connected to the bottom of the junction box 28. The steel pipe 228 is also made of stainless steel. Stainless steel pipes are chosen for threading the wire harness, preventing tangling and wear during movement, and providing insulation. The steel pipe 228, junction box 28, and resistivity meter body 1 can be installed at the testing position of the graphitization furnace, such as the furnace surface or feed inlet, according to actual operational needs. The resistivity meter body 1 has four voltage lines 229 installed at its terminals. One end of each voltage line 229 passes through the inner cavity of the test tube 21. Made of 304 stainless steel and epoxy resin board, these lines primarily serve an insulating function, requiring minimal material and keeping overall costs under control. The system is extremely easy to operate, fully compatible with commercially available standard four-probe testers, requiring no circuit modification. Operators can master the process in 30 minutes of training: insert → test → unplug → record.

[0037] See attached document Figure 1-10, a detection component 231 is installed at one end of the voltage wires 229, wherein the voltage wires 229 are two current wires and two voltage wires matched with the resistivity tester body 1, and the detection component 231 is two current probes and two voltage probes, so as to detect the stacking area of auxiliary materials inside the furnace body; a plurality of limiting plates are fixedly connected inside the test cylinder 21, the limiting plates for fixing the positions of the current probes and the voltage probes are made of epoxy resin plates, which can also be replaced by wood plates, mainly playing the roles of insulation and positioning; a holding box 29 is fixedly connected to the top of the junction box 28, a first installation box 210 is fixedly connected to the inner cavity of the holding box 29, two operating rods 211 are rotatably connected to the inner cavity of the first installation box 210, synchronous wheels 212 are respectively installed on the outer surfaces of the two operating rods 211, and the two synchronous wheels 212 are in transmission connection via a synchronous belt; the top end of the operating rod 211 penetrates the outside of the inner cavity of the first installation box 210, a transmission cam 213 is fixedly connected to the outer surface of the operating rod 211, and the connecting position between the transmission cam 213 and the operating rod 211 is located at the top of the first installation box 210.

[0038] With reference to the Figure 3-11 , fixed long rods 214 are slidably connected to both sides of the inner cavity of the holding box 29, and both sides of the inner cavity of the holding box 29 are provided with sliding chutes slidably connected with the fixed long rods 214, the total number of the fixed long rods 214 is four, four through cavities matched with the fixed long rods 214 are opened at the bottom of the inner cavity of the test cylinder 21, so as to facilitate the movement of the fixed long rods 214; a guide ejector rod 215 is fixedly connected to the outer surface of the fixed long rod 214, and the guide ejector rod 215 is matched with the transmission cam 213, so as to facilitate the transmission cam 213 to push the guide ejector rod 215 to move; positioning plates 216 are fixedly connected to both sides of the inner cavity of the holding box 29, a spring 217 is connected to one side of the positioning plate 216, and one end of the spring 217 is connected to the fixed long rod 214; a push rod 218 is fixedly connected to the top end of the fixed long rod 214, a guide operating frame 219 is fixedly connected to the outer surface of the rotating rod 24, one side of the guide operating frame 219 is movably connected with the push rod 218, and one side of the guide operating frame 219 is provided with a limiting slot slidably connected with the push rod 218; a plurality of transverse plates 220 are fixedly connected to the inner cavity of the test cylinder 21, and a sliding rod 221 is fixedly connected to one side of the transverse plate 220.

[0039] With reference to the Figure 1-10One end of the slide bar 221 is fixedly connected to the fixed long rod 214. The inner cavity of the placement box 29 is fixedly connected to the second mounting box 222. The inner cavity of the second mounting box 222 is provided with a round rod 223. The inner cavities of the second mounting box 222 and the placement box 29 are respectively fixedly connected to several first short plates, and one side of the second short plate is rotatably connected to the round rod 223. One end of the round rod 223 and the running rod 211 are respectively fixedly connected to the transmission bevel gear 224, and the two transmission bevel gears 224 mesh with each other. The inner cavity of the placement box 29 is fixedly connected to the third mounting box 225.

[0040] See attached document Figure 1-11 A worm gear 226 is installed through the inner cavity of the third mounting box 225. Second short plates are fixedly connected to the inner cavities of the third mounting box 225 and the placement box 29, respectively. One side of the second short plate is rotatably connected to the worm gear 226, while one end of the worm gear 226 penetrates the outer side of the placement box 29 and is fixedly connected to a handwheel for easy user rotation. The contact area between the worm gear 226 and the placement box 29 is sealed, for example, by adding a sealed bearing. A protective plate 230 is bolted to one side of the placement box 29, allowing the user to periodically disassemble the sealing plate to maintain internal parts of the placement box 29, such as springs 217. To prevent the spring 217 from twisting and deforming during use, and to remove residual furnace auxiliary materials, a worm gear 227 is fixedly connected to the outer surface of the round rod 223, and the worm gear 227 and the worm 226 mesh with each other. The detection component 2 is constructed entirely of insulating materials, such as wood or epoxy resin. The detection component 2 can establish a database through external information equipment to accurately locate areas with abnormal resistivity (such as near the electrode side or corner areas), providing data support for optimizing the use of resistive materials or the insulation structure, thereby extending the life cycle of the entire furnace body, significantly saving equipment maintenance and repair costs, and thus retaining data.

[0041] Specifically, according to the testing method of the four-probe resistivity meter, it is only necessary to refer to the specific requirements of different models of equipment and input the cross-sectional area as a fixed value into the resistivity meter body 1. During operation, first, perform action two: pass the wire harness (voltage wire 229) through the steel pipe 228, and complete the connection between the current wire and the current needle, and the voltage wire 229 and the voltage needle (detection component 231) in the junction box 28. Then, insert the current needle and voltage needle into the epoxy resin tube according to the opening position of the limit plate. Next, perform action three: place the resistivity meter body 1 on the furnace wall or in a convenient position, turn the handwheel, the handwheel drives the worm gear 226 to rotate, the worm gear 226 meshes with the worm wheel 227 to drive the transmission bevel gear 224 to rotate, the transmission bevel gear 224 drives the running rod 211 to rotate, the running rod 211 drives the transmission cam 213 to rotate through the synchronous wheel 212, and the transmission cam 213 pushes the four guide rods 215 in opposite directions. The movement is square; during reset, the guide rod 215 returns to its original position under the action of the spring 217 due to the loss of the resistance force of the transmission cam 213, and drives the fixed long rod 214 and push rod 218 to move synchronously in sequence. The push rod 218 slides in the guide running frame 219, thereby pushing the guide running frame 219 to drive the rotating rod 24 to swing. The rotating rod 24 is linked with the second sealing plate 26 to swing synchronously. During the downward movement of the second sealing plate 26, it pushes the telescopic hose 27 downward to avoid collision, and at the same time, a gap is formed between it and the first sealing plate 22, so that the auxiliary material in the furnace can enter the test cylinder 21. At this time, the steel pipe 228 is held and rotated back and forth and slowly inserted into the area to be tested, so that the material enters the test cylinder 21. The insertion is stopped when the resistive material plane drops to the lower edge of the placement box 29. After completing the above operations, proceed to action five: turn on the resistivity meter body 1 to start testing and record and display the data. For each furnace, select 9 points for measurement: furnace head (left, middle, right), furnace middle (left, middle, right), and furnace tail (left, middle, right). If the test value deviation is large, the number of measuring points can be increased as appropriate. If there is still a significant deviation, notify the production personnel to rectify or replace the resistivity material.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace, characterized in that, The resistivity measuring instrument includes a main body (1), a detection component (2) is provided on the top of the main body (1), the detection component (2) includes a test cylinder (21), a telescopic hose (27) is connected to the top of the test cylinder (21), four first sealing plates (22) are fixedly connected to the top of the telescopic hose (27), four fixing plates (23) are fixedly connected to the inner cavity of the test cylinder (21), a rotating rod (24) is rotatably connected to both sides of the fixing plate (23), a connecting plate (25) is fixedly connected to the outer surface of the rotating rod (24), a second sealing plate (26) is fixedly connected to the top of the connecting plate (25), a junction box (28) is installed on the top of the resistivity measuring instrument (1), and a steel pipe (228) is fixedly connected to the bottom of the junction box (28).

2. The resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 1, characterized in that, The resistivity measuring instrument body (1) is equipped with four voltage lines (229) at the terminal. One end of each voltage line (229) passes through the inner cavity of the test tube (21), and a detection component (231) is installed at the other end of each voltage line (229).

3. The resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 1, characterized in that, The top of the junction box (28) is fixedly connected to a placement box (29), and the inner cavity of the placement box (29) is fixedly connected to a first mounting box (210). The inner cavity of the first mounting box (210) is rotatably connected to two operating rods (211).

4. The resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 3, characterized in that, Two synchronous pulleys (212) are respectively installed on the outer surfaces of the two operating rods (211), and the two synchronous pulleys (212) are connected by synchronous belt drive. The top of the operating rod (211) penetrates the outer side of the inner cavity of the first mounting box (210), and a transmission cam (213) is fixedly connected to the outer surface of the operating rod (211).

5. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 4, characterized in that, Both sides of the inner cavity of the placement box (29) are slidably connected to fixed long rods (214), and the outer surface of the fixed long rods (214) is fixedly connected to guide rods (215).

6. The resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 3, characterized in that, Positioning plates (216) are fixedly connected to both sides of the inner cavity of the placement box (29). A spring (217) is connected to one side of the positioning plate (216). One end of the spring (217) is connected to a fixed long rod (214). A push rod (218) is fixedly connected to the top of the fixed long rod (214).

7. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 6, characterized in that, The outer surface of the rotating rod (24) is fixedly connected to a guide frame (219), one side of the guide frame (219) is movably connected to the push rod (218), and the inner cavity of the test cylinder (21) is fixedly connected to several horizontal plates (220).

8. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 7, characterized in that, A slide rod (221) is fixedly connected to one side of the horizontal plate (220), and one end of the slide rod (221) is fixedly connected to a fixed long rod (214).

9. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 4, characterized in that, The inner cavity of the placement box (29) is fixedly connected to a second mounting box (222), and a round rod (223) is provided through the inner cavity of the second mounting box (222). One end of the round rod (223) and the running rod (211) are respectively fixedly connected to a transmission bevel gear (224), and the two transmission bevel gears (224) mesh with each other.

10. A resistivity measuring device for the auxiliary material area of ​​a graphitization furnace according to claim 9, characterized in that, The inner cavity of the placement box (29) is fixedly connected to a third mounting box (225). A worm gear (226) is provided through the inner cavity of the third mounting box (225). A worm wheel (227) is fixedly connected to the outer surface of the round rod (223), and the worm wheel (227) and the worm gear (226) mesh with each other. A protective plate (230) is bolted to one side of the placement box (29).

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