A laser detection device for graphite negative electrode material

Abstract

The application belongs to the technical field of graphite negative electrode material detection, and particularly discloses a laser detection device for graphite negative electrode material, which comprises a workbench, a detection cylinder is arranged on the workbench, and the device is characterized in that the device further comprises a laser detection mechanism, which is used for detecting the particle size distribution of the material in the detection cylinder, the laser detection mechanism is arranged on the upper part of the detection cylinder in a liftable manner, the laser detection mechanism comprises a support arranged above the workbench and a transmission disc arranged on the support in a liftable manner and corresponding to the detection cylinder, heat generated by friction between the friction ring, the friction ball and the fixed friction disc is guided to the laser shell to preheat the laser source, an electric heating module does not need to be additionally arranged, the energy consumption of the equipment is reduced, the cooling mechanism adopts a spiral liquid cooling pipe structure, the heat exchange area and the cooling liquid flow path are significantly increased compared with a traditional straight channel liquid cooling, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of graphite anode material testing technology, and more particularly to a laser testing device for graphite anode materials. Background Technology

[0002] In the lithium-ion battery industry chain, the core performance parameters of graphite anode materials, such as particle size distribution and crystallinity, directly determine the battery's charge-discharge capacity, cycle life, and rate performance. Therefore, conducting high-precision and highly repeatable testing of graphite anode materials is a crucial step in ensuring battery product quality. Laser testing technology, with its advantages of non-contact measurement, fast response speed, and high resolution, has become the mainstream technique for characterizing the performance of graphite anode materials. Through the scattering and diffraction of laser beams with graphite particles, it can accurately calculate the particle size of the material. Furthermore, combined with Raman spectroscopy analysis, it can also qualitatively and quantitatively determine the crystallinity of graphite.

[0003] However, the application of laser detection technology in the detection of graphite anode materials faces two major technical challenges: poor temperature stability of the laser source and interference of laser thermal effects with detection accuracy. These challenges severely restrict the reliability of the detection results. The core components of a laser source (laser diode and resonant cavity mirrors) are extremely sensitive to temperature changes. Temperature fluctuations can cause two major problems: First, the resonant cavity mirrors undergo microscopic deformation due to thermal expansion and contraction, leading to a shift in the optical path refraction angle. Experimental data shows that for every 5°C fluctuation in the laser source temperature, the beam drift can reach 0.03 milliradians, directly causing deviations in the reception of scattered signals. Second, the threshold current of the semiconductor laser increases with temperature, causing fluctuations in laser output power, which in turn leads to repeatability errors in the detection data exceeding ±3%, failing to meet industry standard requirements. Therefore, before starting laser detection, the laser source must be preheated to the optimal operating temperature range of 35~40°C and maintained at a stable temperature.

[0004] In existing technologies, laser preheating generally relies on independent electric heating modules, which heat the laser source casing via heating wires or heating plates. However, this method has significant drawbacks: First, independent electric heating requires additional electrical energy, increasing equipment operating costs and contradicting the green and energy-saving development trend of the new energy industry; second, electric heating is prone to localized overheating, resulting in uneven temperature distribution of the laser source and poor preheating stability; third, the additional heating module increases the complexity of the equipment structure, occupies compact installation space, and is not conducive to the miniaturization and integration of online continuous detection devices.

[0005] During laser detection, the laser beam focused inside the detection cylinder generates a laser thermal effect due to the absorption of photon energy by graphite particles and the dispersion solution, causing multiple negative impacts on the detection system: First, laser heat raises the local temperature of the dispersion solution (deionized water, ethanol), leading to a decrease in solution viscosity, an accelerated sedimentation rate of graphite particles, and a tendency for large-diameter particles to aggregate in the laser focusing area, resulting in a systematic error of "overestimating" particle size. Second, local overheating induces micro-convection in the solution, forming thermal vortices that drive disordered movement of graphite particles, causing the scattering signal fluctuation to exceed ±5%. Third, laser heat is transferred to the inner wall of the detection cylinder through heat conduction, causing thermal deformation of the quartz detection cylinder, altering the laser beam propagation path, and further exacerbating detection deviations. Fourth, for Raman spectroscopy detection, laser heat can also cause the water and dispersant adsorbed on the surface of graphite particles to evaporate, and may even cause slight oxidation at the particle edges, interfering with the intensity ratio of Raman characteristic peaks (D peak, G peak) and misjudging the crystallinity of graphite.

[0006] To counteract the thermal effect of laser, existing technologies typically employ a straight-channel liquid cooling structure to cool the detection cylinder. However, straight-channel liquid cooling suffers from drawbacks such as a small heat exchange area and a short coolant flow path, resulting in low heat exchange efficiency. This makes it difficult to achieve precise temperature control within the detection cylinder, and sample temperature fluctuations during the detection process can still reach ±0.5℃ or higher, failing to effectively suppress the interference of laser heat.

[0007] Meanwhile, in the laser detection process of graphite anode materials, to prevent graphite particles from agglomerating due to hydrophobicity and to ensure the uniformity of the test sample, a stirring device is needed to thoroughly mix and disperse the graphite material and dispersion solution in the detection cylinder. In existing detection devices, the stirring function is achieved by a drive rod driving the stirring blades. During the stirring process, the mechanical movement of the drive rod and the guide component inevitably generates frictional heat, but this heat is not effectively utilized and requires an additional heat dissipation structure to dissipate, resulting in energy waste. At the same time, the stirring drive system, laser preheating system, and liquid cooling system are independent of each other, and the three lack coordinated design, further exacerbating the problems of high energy consumption, structural redundancy, and low integration of the equipment.

[0008] In summary, existing laser detection devices for graphite anode materials have the following key technical defects: Laser preheating relies on an independent electric heating module, which has high energy consumption, poor preheating stability, and increases the complexity of the equipment structure. Laser thermal effects can cause problems such as solution convection, particle sedimentation, and deformation of the detection cylinder, which can interfere with detection accuracy. Traditional straight-channel liquid cooling structures have low heat exchange efficiency and poor temperature control. The frictional heat generated during the stirring process is not properly recovered and utilized, resulting in energy waste. Furthermore, the three systems of stirring, preheating, and cooling are independent of each other, resulting in low equipment integration.

[0009] Therefore, developing a laser detection device for graphite anode materials that can recover heat from stirring friction to preheat the laser, precisely offset the laser thermal effect through spiral liquid cooling, and achieve multi-system coordinated linkage, in order to solve the pain points of existing technologies, has become a technological direction that urgently needs to be broken through in this field. Summary of the Invention

[0010] To address the aforementioned problems, this invention proposes a laser detection device for graphite anode materials, which more accurately solves the problems mentioned in the background section.

[0011] This invention provides a laser detection device for graphite anode materials, comprising a worktable on which a detection cylinder is disposed, characterized in that it further comprises: A laser detection mechanism is used to detect the particle size distribution of materials inside the detection cylinder. The laser detection mechanism is vertically and flexibly mounted on the upper part of the detection cylinder. The laser detection mechanism includes a support mounted above the worktable and a transmission disk vertically and flexibly mounted between the detection cylinders corresponding to the support. A laser housing coaxially corresponding to the detection cylinder is fixed at the bottom of the transmission disk. A laser detection head is provided on the side of the laser housing facing away from the transmission disk. A laser preheating mechanism connected to the laser housing and used to preheat the laser source of the laser housing is provided at the bottom of the transmission disk. The laser preheating mechanism includes a fixed friction disk suspended at the bottom of the transmission disk, and a friction ring rotatably disposed within the fixed friction disk. Friction balls are disposed on the outer periphery of the friction ring and rub against the fixed friction disk. A heat-conducting rod connects the transmission disk and the fixed friction disk. The heat-conducting rod is connected to a heat-conducting strip located on the transmission disk via a heat insulator. The heat-conducting strip is connected to the laser housing. A temperature sensor is disposed within the laser housing. A collection component is disposed on the fixed friction disk for collecting debris generated by friction between the friction balls and the fixed friction disk. A stirring mechanism is used to stir and mix the materials inside the detection cylinder. The stirring mechanism is correspondingly disposed on the upper part of the detection cylinder and connected to the transmission disk. A cooling mechanism is used to cool down the heat generated when the material inside the detection cylinder is detected by the laser detection head and stirred by the stirring mechanism; The controller, mounted on the bracket, is signal-connected to the laser detection mechanism, the laser preheating mechanism, the stirring mechanism, and the cooling mechanism. Preferably, the fixed friction disc has an annular hole on one side corresponding to the friction ring, the friction ring is located inside the annular hole, and the friction ball is in contact with the inner wall of the annular hole.

[0012] Preferably, a motor is mounted on the top surface of the transmission disk, a drive rod is connected between the transmission disk and the friction ring, and the drive rod is connected to the output shaft of the motor.

[0013] Preferably, the collecting assembly includes a debris collecting hopper installed at the bottom of the fixed friction disc, one end of the drive rod extends through the friction ring into the ring hole and is connected to an inclined connecting rod, and a scraper is fixed at the end of the connecting rod away from the friction ring and in contact with the inner wall of the debris collecting hopper.

[0014] Preferably, the stirring mechanism includes a gear ring connected to the drive rod and rotatably inside the transmission disk, and a stirring rod rotatably disposed inside the transmission disk along the outer periphery of the gear ring, and a transmission gear meshing with the gear ring is fixed on the stirring rod.

[0015] Preferably, the stirring rod has a stirring blade fixed at one end located inside the detection cylinder.

[0016] Preferably, the cooling mechanism includes a liquid cooling tank installed on the workbench and a circulation pump installed on the workbench and connected to the liquid cooling tank through a liquid inlet. The outlet of the circulation pump is connected to a delivery pipe connected to the detection cylinder. A spiral liquid cooling pipe connected to the delivery pipe is installed inside the detection cylinder. The return end of the spiral liquid cooling pipe is connected to a return pipe. The return pipe is connected to the liquid cooling tank through a central pipe.

[0017] Preferably, a hydraulic cylinder is mounted on the bracket, and the output end of the hydraulic cylinder is connected to a connecting frame that is connected to the transmission disc.

[0018] Preferably, a slider is fixed on the outer periphery of the transmission disk, and at least two or more sliders are provided. A groove is provided on the inner side of the bracket for the sliders to slide vertically.

[0019] A laser detection method for graphite anode materials, using the laser detection device for graphite anode materials as described above, includes the following steps: S1: Place the graphite anode material to be tested into the testing cylinder, the controller starts the hydraulic cylinder, and drives the transmission plate to descend along the slide groove of the bracket, so that the laser detection head is aligned with the material testing surface, and the stirring blade extends into the material. S2: Start the motor to drive the friction ring to rotate. The heat generated by friction is directed to the laser source inside the preheating laser shell through the laser preheating mechanism. The temperature sensor provides real-time feedback of the temperature to the controller for adjustment. Simultaneously, the stirring rod is driven to rotate and mix the material. The circulation pump is started to circulate the cooling medium in the spiral liquid cooling pipe to control the temperature. The scraper simultaneously cleans the friction debris. S3: After the laser source is preheated to the required standard, the controller starts the laser detection head to detect the particle size distribution of the graphite anode material in the detection cylinder. The detection data is fed back to the controller for processing and storage in real time. S4: After the test is completed, the controller shuts down the laser detection head, motor and circulation pump, controls the hydraulic cylinder to drive the transmission plate to rise and reset, takes out the tested material and cleans the debris in the debris collection hopper.

[0020] Compared with the prior art, the present invention provides a laser detection device for graphite anode materials, which has the following beneficial effects: This laser detection device for graphite anode material generates heat through friction between the friction ring and the fixed friction disk during the stirring process. This heat is then directionally conducted to the laser shell via heat-conducting rods and strips, achieving preheating of the laser source. This eliminates the need for an additional electric heating module, reducing energy consumption and aligning with the trend of green energy conservation. Simultaneously, by adjusting the heat conduction rate through a heat insulator and combining it with real-time feedback from a temperature sensor, the laser source temperature can be precisely controlled within the optimal operating range of 35~40℃, preventing localized overheating and improving preheating stability.

[0021] The laser detection device for this graphite anode material employs a spiral liquid cooling tube structure for its cooling mechanism. Compared to traditional straight-channel liquid cooling, this significantly increases the heat exchange area and coolant flow path, thereby improving heat exchange efficiency. It can precisely counteract the laser thermal effect and stirring-generated heat during laser detection, maintaining the sample temperature inside the detection tube stably at 25±0.1℃. This effectively avoids problems such as solution convection, particle sedimentation, and detection tube deformation, ensuring the stability of the laser optical path and reducing the repeatability error of the detection data.

[0022] This laser detection device for graphite anode materials achieves integrated and coordinated operation of "stirring-preheating-cooling-self-cleaning" by synchronously driving three functions—friction heating (preheating), stirring and dispersion, and debris cleaning—with the coordinated work of a cooling mechanism. This simplifies the equipment structure, reduces equipment redundancy, improves integration, and facilitates the miniaturization design of online continuous detection devices.

[0023] The laser detection device for this graphite anode material uses a collection component set in the laser preheating mechanism to clean up the debris generated by friction in real time with a scraper, avoiding debris accumulation that affects the efficiency of frictional heat generation; at the same time, each system is automatically controlled by a controller, reducing manual intervention, improving the stability and reliability of equipment operation, and extending the service life of the equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a laser detection device for graphite anode materials proposed in this invention; Figure 2This is a rear view schematic diagram of a laser detection device for graphite anode materials proposed in this invention. Figure 3 This invention proposes a laser detection device for graphite anode materials. Figure 2 A magnified structural diagram of part A in the diagram; Figure 4 This is a schematic diagram of the internal structure of the transmission disk portion of a laser detection device for graphite anode materials proposed in this invention. Figure 5 This is a schematic diagram of the bottom structure of the transmission disk portion of a laser detection device for graphite anode materials proposed in this invention. Figure 6 This invention proposes a laser detection device for graphite anode materials. Figure 5 A magnified structural diagram of part B in the diagram; Figure 7 This is a schematic diagram of the fixed friction disk portion of a laser detection device for graphite anode materials proposed in this invention. Figure 8 This is an exploded structural diagram of the fixed friction disk, friction ring, and collection hopper of a laser detection device for graphite anode material proposed in this invention. Figure 9 This is a cross-sectional view of the detection cylinder and spiral liquid-cooled tank of a laser detection device for graphite anode materials proposed in this invention.

[0025] In the diagram: 1. Workbench; 2. Detection cylinder; 3. Transmission disc; 4. Laser housing; 401. Laser detection head; 402. Temperature sensor; 5. Fixed friction disc; 501. Heat-conducting rod; 502. Friction ring; 503. Friction ball; 504. Heat-conducting strip; 505. Heat inhibitor; 6. Connecting rod; 601. Scraper; 602. Debris collection hopper; 7. Motor; 701. Drive rod; 8. Liquid cooling tank; 801. Circulation pump; 802. Delivery pipe; 803. Return pipe; 804. Centralized pipe; 805. Spiral liquid cooling pipe; 9. Gear ring; 901. Stirring rod; 902. Transmission gear; 903. Stirring blade; 10. Support; 1010. Hydraulic cylinder; 1011. Connecting frame; 11. Slide groove; 1110. Slider; 12. Controller. Detailed Implementation

[0026] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings. Example

[0027] like Figures 1-9 As shown, an embodiment of the present invention provides a laser detection device for graphite anode materials, including a worktable 1, a detection cylinder 2 disposed on the worktable 1, and further comprising: A laser detection mechanism is used to detect the particle size distribution of the material inside the detection cylinder 2. The laser detection mechanism is vertically mounted on the upper part of the detection cylinder 2. The laser detection mechanism includes a support 10 mounted on the workbench 1 and a transmission disk 3 that is vertically mounted between the support 10 and the detection cylinder 2. A laser housing 4 coaxially corresponding to the detection cylinder 2 is fixed at the bottom of the transmission disk 3. A laser detection head 401 is provided on the side of the laser housing 4 facing away from the transmission disk 3. A laser preheating mechanism connected to the laser housing 4 is provided at the bottom of the transmission disk 3 for preheating the laser source of the laser housing 4. A hydraulic cylinder 1010 is mounted on the support 10. The output end of the hydraulic cylinder 1010 is connected to a connecting frame 1011 connected to the transmission disk 3.

[0028] Among them, such as Figure 1 As shown, the worktable 1 is ring-shaped, and three detection cylinders 2 are arranged circumferentially on the worktable 1 with the worktable 1 as the center. The transmission disk 3 of the laser detection mechanism is suspended between the bracket 10 and the worktable 1 in a liftable manner. The laser housing 4 has three corresponding top openings of the three detection cylinders 2, and the laser housing 4 is circular with a hollowed-out axis. The laser detection heads 401 are distributed in a circumferential array on the side of the laser housing 4 opposite to the detection cylinders 2. When detecting the material inside the detection cylinder 2, the transmission disk 3 can be moved by the hydraulic cylinder 1. Driven by 010, the laser detection head 401 descends, bringing it close to the detection cylinder 2 at a certain distance. Based on the laser scattering / diffraction effect (following Mie scattering theory), the laser detection head 401 detects the particle size distribution of the graphite anode material. The model of the laser detection head 401 is LS-Particle-650. Furthermore, there is no limit to the number of detection cylinders 2 and laser housings 4; they can be set according to actual needs. It is necessary to ensure that the detection cylinders 2 and laser housings 4 correspond, and the number of laser detection heads 401 can also be set according to requirements.

[0029] like Figure 5 and Figure 6As shown, the laser preheating mechanism includes a fixed friction disk 5 suspended at the bottom of the transmission disk 3, and a friction ring 502 rotatably disposed within the fixed friction disk 5. Friction balls 503 are disposed on the outer periphery of the friction ring 502 and rub against the fixed friction disk 5. A heat-conducting rod 501 is connected between the transmission disk 3 and the fixed friction disk 5. The heat-conducting rod 501 is connected to a heat-conducting strip 504 located on the transmission disk 3 through a heat shield 505. The heat-conducting strip 504 is connected to the laser housing 4. A temperature sensor 402 is disposed inside the laser housing 4. A collection component is disposed on the fixed friction disk 5 for collecting debris generated by friction between the friction balls 503 and the fixed friction disk 5. An annular hole is disposed on one side of the fixed friction disk 5 corresponding to the friction ring 502. The friction ring 502 is located inside the annular hole, and the friction balls 503 are in contact with the inner wall of the annular hole. A motor 7 is mounted on the top surface of the transmission disk 3. A drive rod 701 is connected between the transmission disk 3 and the friction ring 502. The drive rod 701 is connected to the output shaft of the motor 7. A stirring mechanism is used to stir and mix the materials inside the detection cylinder 2. The stirring mechanism is correspondingly set on the upper part of the detection cylinder 2 and connected to the transmission disk 3. The cooling mechanism is used to cool down the heat generated when the material inside the detection cylinder 2 is detected by the laser detection head 401 and stirred by the stirring mechanism. The controller 12 is mounted on the bracket 10 and is connected to the laser detection mechanism, the laser preheating mechanism, the stirring mechanism, and the cooling mechanism via signals.

[0030] The fixed friction disk 5, suspended at the bottom of the transmission disk 3, is connected to the transmission disk 3 via a heat-conducting rod 501. When the friction ring 502 rotates, the friction ball 503 rotates with it and generates heat through friction with the inner ring of the fixed friction disk 5. Since the fixed friction disk 5, heat-conducting rod 501, heat-conducting strip 504, and laser housing 4 are all made of oxygen-free copper with high thermal conductivity, the heat generated by friction is sequentially guided through the friction disk, heat-conducting rod 501, and heat-conducting strip 504 to the laser source of the laser housing 4. Simultaneously, the temperature sensor 402 monitors the temperature at the laser source in real time. If the temperature at the laser source reaches 40°C, the heat shield 505 (model ZDR-01) starts working, blocking the heat conduction between the heat-conducting rod 501 and the heat-conducting strip 504, thereby ensuring that the preheating of the laser source is controlled at 40°C. The temperature reaches ℃, achieving effective preheating of the laser detection head 401. It is worth noting that the rotation of the friction disk and the driving of the stirring mechanism are driven by the same source. Compared with the existing technology, the independent electric heating module needs to consume electrical energy to convert into heat energy, and the electro-thermal conversion has inherent losses, which is contrary to the development trend of green energy conservation in the new energy industry. Conventional waste heat recovery has low preheating efficiency due to heat dispersion and long path, which cannot meet the requirements of rapid laser preheating. This application directly recovers the frictional heat generated during the stirring drive process. This part of the heat is usually regarded as useless work in the existing device and needs to be discharged by an additional heat dissipation structure. This application constructs a directional conduction path through the heat-conducting rod 501 and heat-conducting strip 504 made of oxygen-free copper material, and directly delivers the waste heat to the laser source, achieving zero energy waste. The energy consumption can be reduced by 40%~50% per detection.

[0031] In this invention, the collection assembly includes a debris collection hopper 602 installed at the bottom of the fixed friction disc 5, one end of the drive rod 701 extends through the friction ring 502 into the ring hole and is connected to an inclined connecting rod 6, and a scraper 601 is fixed at the end of the connecting rod 6 away from the friction ring 502 and contacts the inner wall of the debris collection hopper 602.

[0032] like Figure 7 and Figure 8As shown, the debris collection hopper 602 is made of transparent PC material (polycarbonate) and has an overall inverted conical structure. The upper port diameter is larger than the lower port diameter, which facilitates observation of the internal debris accumulation. It also has good mechanical strength and wear resistance. The inner wall of the collection hopper is smooth to reduce debris adhesion and facilitate scraping and cleaning by the scraper 601. The lower port is equipped with a sealing cover, which can be opened directly during cleaning to prevent debris from spilling and contaminating the testing environment. When the friction ring 502 rotates, the debris generated by the friction between the friction ball 503 and the inner ring of the fixed friction disk 5 is thrown to the outside of the ring hole under the action of centrifugal force and falls directly into the debris collection hopper 602 below. Some debris that does not fall directly will adhere to the inner wall of the collection hopper and be concentrated and pushed to the conical gathering area at the bottom of the collection hopper by the rotation of the scraper 601. Because the collection hopper has an inverted conical structure, the debris will naturally settle and gather under the action of gravity, avoiding secondary flying.

[0033] In this invention, the stirring mechanism includes a gear ring 9 connected to the drive rod 701 and rotating inside the transmission disk 3. A stirring rod 901 is rotatably arranged inside the transmission disk 3 along the outer periphery of the gear ring 9. A transmission gear 902 that meshes with the gear ring 9 is fixed on the stirring rod 901. A stirring blade 903 is fixed at one end of the stirring rod 901 located inside the detection cylinder 2.

[0034] like Figure 4 and Figure 5 As shown, when the hydraulic cylinder 1010 pushes the transmission disc 3 downward through the connecting frame 1011 until the stirring blade 903 is located inside the detection cylinder 2, and the drive rod 701 is driven to rotate by the motor 7, it drives the gear ring 9 to rotate through meshing with the transmission gear 902, and the stirring rod 901 drives the stirring blade 903 to rotate, so that the graphite-dispersion solution suspension in the detection cylinder 2 forms a circulating flow: the bottom solution surges upward and the upper solution settles downward, avoiding the sedimentation of large-diameter particles.

[0035] In this invention, the cooling mechanism includes a liquid cooling tank 8 installed on a workbench 1 and a circulation pump 801 connected to the liquid cooling tank 8 via an inlet on the workbench 1. The outlet of the circulation pump 801 is connected to a delivery pipe 802 connected to a detection cylinder 2. A spiral liquid cooling pipe 805 connected to the delivery pipe 802 is provided inside the detection cylinder 2. The return end of the spiral liquid cooling pipe 805 is connected to a return pipe 803. The return pipe 803 is connected to the liquid cooling tank 8 via a central pipe 804.

[0036] like Figure 2 and Figure 3 As shown, the circulating pump 801, through power pressurization, pushes the cooling medium through the delivery pipe 802 to the liquid inlet of the detection cylinder 2, and then introduces it into the spiral liquid cooling pipe 805 in the inner wall interlayer of the detection cylinder 2. The cooling medium flows along the spiral liquid cooling pipe 805 (e.g., ... Figure 9The spiral flow path (as shown) involves efficient forced convection heat transfer with the graphite-dispersion suspension in the detection cylinder 2. The cooling medium absorbs laser heat and stirring heat from the sample, causing its own temperature to rise, while the sample temperature is rapidly reduced. The heated cooling medium, having completed heat exchange, flows out through the return end of the spiral liquid cooling pipe 805, merges into the central pipe 804 through the return pipe 803, and finally returns to the liquid cooling tank 8. After being cooled by natural heat dissipation (or an external radiator) in the liquid cooling tank 8, it awaits the next cycle. It is worth noting that the inner wall of the detection cylinder 2 is equipped with temperature... The detector (DS18B20) acquires sample temperature data in real time and feeds it back to the controller 12. The controller 12 dynamically adjusts the flow rate of the circulating pump 801 according to the temperature deviation. For example, the flow rate is increased when the sample temperature is higher than 25.1℃ and decreased when it is lower than 24.9℃, ensuring that the temperature is stable within the set range. This forms a temperature synergy with the laser preheating mechanism, where the cooling medium maintains the sample at a low temperature and avoids laser thermal interference detection. At the same time, frictional heat generation preheats the laser source without additional energy consumption, achieving an energy balance between preheating and cooling, and improving the overall energy efficiency of the device.

[0037] In this invention, a slider 1110 is fixedly provided on the outer periphery of the transmission disk 3, and at least two or more sliders 1110 are provided. A groove 11 is provided on the inner side of the bracket 10 for the sliders 1110 to slide vertically.

[0038] like Figure 1 and Figure 2 As shown, when the transmission disk 3 is driven downward by the hydraulic cylinder 1010 to drive the connecting frame 1011, the transmission disk 3 synchronously drives the slider 1110 to slide in the slide groove 11, thereby achieving the lifting and lowering limit of the transmission disk 3. Moreover, the cooperation between the slider 1110 and the slide groove 11 can have a certain amplitude control effect on the vibration amplitude of the transmission disk 3 when the internal gear transmission, friction heat generation and other components are working at high speed, ensuring the coaxiality of the laser detection head 401 and the detection cylinder 2 is stable, and avoiding the optical path offset from affecting the acquisition of the scattered signal.

[0039] A laser detection method for graphite anode materials, employing the aforementioned laser detection device for graphite anode materials, includes the following steps: S1: Place the graphite anode material to be tested into the testing cylinder 2. The controller 12 starts the hydraulic cylinder 1010, which drives the transmission disc 3 to descend along the slide groove 11 of the bracket 10, so that the laser detection head 401 is aligned with the material detection surface and the stirring blade 903 extends into the material. The hydraulic cylinder 1010 drives the connecting frame 1011 to move the transmission disc 3 downward. During this process, the cooperation between the slide groove 11 and the slider 1110 limits the transmission disc 3, keeping it vertically and stably descending until the stirring blade 903 enters the material of the detection cylinder 2.

[0040] S2: Start motor 7 drives friction ring 502 to rotate. Heat generated by friction is directed to the laser source inside the preheating laser shell 4 through laser preheating mechanism. Temperature sensor 402 provides real-time temperature feedback to controller 12 for regulation. Simultaneously, stirring rod 901 is rotated to mix materials. Circulation pump 801 is started to circulate and control the temperature of cooling medium in spiral liquid cooling pipe 805. Scraper 601 simultaneously cleans friction debris. Motor 7 drives drive rod 701 to rotate. Drive rod 701, through gear ring 9 and transmission gear 902, drives stirring rod 901 to rotate. Stirring blade 903 then mixes the material. Simultaneously, drive rod 701 drives friction ring 502 to rotate, causing friction between friction balls 503 and the inner wall of fixed friction disk 5, generating heat. This heat is guided by heat-conducting rod 501 and heat-conducting strip 504 to the laser source in laser housing 4, preheating laser detection head 401. This achieves the effect of generating heat through friction while stirring the material, and recovering the preheated state of laser detection head 401. During this process, friction balls 503 rub against fixed friction disk 5... The debris produced by the wiping process enters the collection hopper. At the same time, the drive rod 701 drives the inclined connecting rod 6 to rotate, causing the scraper 601 to scrape off some of the debris attached to the inner wall of the collection hopper. Meanwhile, the circulation pump 801 transports the liquid in the liquid cooling tank 8 to the spiral liquid cooling pipe 805 through the delivery pipe 802, and cools the material in the detection cylinder 2. The cooled liquid flows back to the liquid cooling tank 8 through the return pipe 803 and the collection pipe 804. This cooling of the material can offset the heat brought by the laser detection head 401 to the material after the laser detection head 401 detects the material, fundamentally solving the technical pain point of laser thermal effect interfering with the detection accuracy.

[0041] S3: After the laser source is preheated to the required standard, the controller 12 starts the laser detection head 401 to detect the particle size distribution of the graphite anode material in the detection cylinder 2. The detection data is fed back to the controller 12 for processing and storage in real time. When the temperature sensor 402 inside the laser housing 4 detects that the heat at the laser source has reached a certain threshold, it sends a signal to the controller 12. The controller 12 turns on the heat blocker 505 to disconnect the heat conduction between the heat conduction rod 501 and the heat conduction strip 504. At the same time, the controller 12 starts the laser detection head 401 to detect the particle size distribution of the graphite negative electrode material in the detection cylinder 2. The detection data is fed back to the controller 12 in real time for processing and storage.

[0042] S4: After the test is completed, the controller 12 shuts down the laser detection head 401, the motor 7 and the circulation pump 801, controls the hydraulic cylinder 1010 to drive the transmission plate 3 to rise and reset, takes out the tested material and cleans the debris in the debris collection hopper 602.

[0043] Working Principle: Before testing, the graphite anode material suspension is placed into the testing cylinder 2 of the annular worktable 1. The controller 12 drives the hydraulic cylinder 1010 to lower the transmission disk 3, aligning the laser detection head 401 with the testing surface and the stirring blade 903 into the suspension, completing the positioning. Then, the motor 7 is started, synchronously driving the stirring mechanism and the laser preheating mechanism: the stirring blade 903 rotates to create a circulating flow in the suspension, preventing particle sedimentation. The waste heat generated by the friction between the friction ring 502 and the fixed friction disk 5 is directionally transported to the laser source for preheating via the oxygen-free copper heat-conducting component. Once the temperature reaches the target, the heat shield 505 precisely controls the temperature. Simultaneously, the cooling mechanism is activated, circulating heat through the spiral liquid cooling pipe 805 and dynamically adjusting the flow rate to maintain the low-temperature stability of the suspension. After the laser source is preheated, the laser detection head 401 performs particle size distribution detection on the homogenized material based on Mie scattering theory, and the data is fed back to the controller 12 for processing and storage in real time. After the detection is completed, all mechanisms are reset, and debris is cleaned to complete a single detection.

[0044] Finally, it should be noted that the basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, and therefore remain within the spirit and scope of the exemplary embodiments of this specification. Furthermore, this specification uses specific terms to describe embodiments of this specification. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined. Moreover, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods of this specification.

[0045] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A laser detection device for graphite anode materials, comprising a worktable, wherein a detection cylinder is disposed on the worktable, characterized in that, Also includes: A laser detection mechanism is used to detect the particle size distribution of materials inside the detection cylinder. The laser detection mechanism is vertically and flexibly mounted on the upper part of the detection cylinder. The laser detection mechanism includes a support mounted above the worktable and a transmission disk vertically and flexibly mounted between the detection cylinders corresponding to the support. A laser housing coaxially corresponding to the detection cylinder is fixed at the bottom of the transmission disk. A laser detection head is provided on the side of the laser housing facing away from the transmission disk. A laser preheating mechanism connected to the laser housing and used to preheat the laser source of the laser housing is provided at the bottom of the transmission disk. The laser preheating mechanism includes a fixed friction disk suspended at the bottom of the transmission disk, and a friction ring rotatably disposed within the fixed friction disk. Friction balls are disposed on the outer periphery of the friction ring and rub against the fixed friction disk. A heat-conducting rod connects the transmission disk and the fixed friction disk. The heat-conducting rod is connected to a heat-conducting strip located on the transmission disk via a heat insulator. The heat-conducting strip is connected to the laser housing. A temperature sensor is disposed within the laser housing. A collection component is disposed on the fixed friction disk for collecting debris generated by friction between the friction balls and the fixed friction disk. A stirring mechanism is used to stir and mix the materials inside the detection cylinder. The stirring mechanism is correspondingly disposed on the upper part of the detection cylinder and connected to the transmission disk. A cooling mechanism is used to cool down the heat generated when the material inside the detection cylinder is detected by the laser detection head and stirred by the stirring mechanism; The controller is mounted on the bracket and is signal-connected to the laser detection mechanism, the laser preheating mechanism, the stirring mechanism, and the cooling mechanism. The fixed friction disc has an annular hole on one side corresponding to the friction ring, the friction ring is located inside the annular hole, and the friction ball is in contact with the inner wall of the annular hole; The collection assembly includes a debris collection hopper installed at the bottom of the fixed friction disc. One end of the drive rod extends through the friction ring into the ring hole and is connected to an inclined connecting rod. The connecting rod has a scraper fixed at the end opposite to the friction ring, which contacts the inner wall of the debris collection hopper.

2. The laser detection device for graphite anode materials according to claim 1, characterized in that, A motor is mounted on the top surface of the transmission disc, and a drive rod is connected between the transmission disc and the friction ring. The drive rod is connected to the output shaft of the motor.

3. The laser detection device for graphite anode materials according to claim 1, characterized in that, The stirring mechanism includes a gear ring connected to the drive rod and rotating inside the transmission disk. A stirring rod is rotatably arranged inside the transmission disk along the outer circumference of the gear ring, and a transmission gear that meshes with the gear ring is fixed on the stirring rod.

4. The laser detection device for graphite anode materials according to claim 3, characterized in that, The stirring rod has a stirring blade fixed at one end located inside the detection cylinder.

5. The laser detection device for graphite anode materials according to claim 1, characterized in that, The cooling mechanism includes a liquid cooling tank installed on the workbench and a circulation pump installed on the workbench and connected to the liquid cooling tank through a liquid inlet. The outlet of the circulation pump is connected to a delivery pipe connected to the detection cylinder. A spiral liquid cooling pipe connected to the delivery pipe is installed inside the detection cylinder. The return end of the spiral liquid cooling pipe is connected to a return pipe. The return pipe is connected to the liquid cooling tank through a central pipe.

6. The laser detection device for graphite anode materials according to claim 1, characterized in that, A hydraulic cylinder is mounted on the bracket, and the output end of the hydraulic cylinder is connected to a connecting frame that is connected to the transmission disc.

7. The laser detection device for graphite anode materials according to claim 1, characterized in that, The outer periphery of the transmission disc is fixed with a slider, and there are at least two or more sliders. The inner side of the bracket is provided with a groove for the slider to slide vertically.

8. A laser detection method for graphite anode materials, using a laser detection device for graphite anode materials as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Place the graphite anode material to be tested into the testing cylinder, the controller starts the hydraulic cylinder, and drives the transmission plate to descend along the slide groove of the bracket, so that the laser detection head is aligned with the material testing surface, and the stirring blade extends into the material. S2: Start the motor to drive the friction ring to rotate. The heat generated by friction is directed to the laser source inside the preheating laser shell through the laser preheating mechanism. The temperature sensor provides real-time feedback of the temperature to the controller for adjustment. Simultaneously, the stirring rod is driven to rotate and mix the material. The circulation pump is started to circulate the cooling medium in the spiral liquid cooling pipe to control the temperature. The scraper simultaneously cleans the friction debris. S3: After the laser source is preheated to the required standard, the controller starts the laser detection head to detect the particle size distribution of the graphite anode material in the detection cylinder. The detection data is fed back to the controller for processing and storage in real time. S4: After the test is completed, the controller shuts down the laser detection head, motor and circulation pump, controls the hydraulic cylinder to drive the transmission plate to rise and reset, takes out the tested material and cleans the debris in the debris collection hopper.

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