Device and method for detecting internal defects of tungsten-cobalt hard alloy blank

Abstract

The application discloses a device and method for detecting internal defects of tungsten-cobalt hard alloy blanks, and relates to the technical field of alloy detection. The device comprises a test shell, an upper end of the test shell is provided with a transmission cavity, two first conveying rods and second conveying rods that are parallel and have different rotating speeds are arranged in the transmission cavity, transmission threads are distributed on the first conveying rods and the second conveying rods, and a transmission gap matched with the tungsten-cobalt alloy rod is formed between the two conveying rods. A multi-point detection assembly for detecting the surface of the tungsten-cobalt alloy rod, a feeding assembly for intermittently providing the tungsten-cobalt alloy rod, a spraying assembly for spraying detection liquid, and a discharging assembly for collecting qualified products and unqualified products are arranged on the test shell. The driving assembly drives the two conveying rods to rotate asynchronously, so that the tungsten-cobalt alloy rod continuously tumbles while advancing in the transmission gap. The device realizes automatic feeding, transmission, spraying, detection and sorting of the tungsten-cobalt hard alloy blanks, significantly improves the detection efficiency and accuracy, and reduces the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of alloy testing technology, specifically to a device and method for detecting internal defects in tungsten-cobalt cemented carbide blanks.

[0002] Tungsten-cobalt (WC-Co) cemented carbide is widely used in the manufacture of cutting tools, mining tools, drawing dies, wear-resistant parts, and precision bearings due to its high hardness, high strength, excellent wear resistance, and red hardness. In the powder metallurgy production process, the blanks obtained after pressing and sintering may contain various microscopic defects, such as porosity, microcracks, inclusions, and cobalt pools. These defects can significantly reduce the mechanical properties and service life of the product. Therefore, internal defect detection of WC-Co cemented carbide blanks is a crucial step in quality control.

[0003] Currently, the inspection of tungsten-cobalt cemented carbide rods is mostly done manually: operators manually rotate the alloy rod to bring the inspection probe into contact with the surface of the rod point by point. This method has the following drawbacks: First, manual rotation of parts is inefficient, especially when the parts are heavy, resulting in extremely high labor intensity for the operator, and prolonged operation can easily lead to missed or repeated inspection points; second, during the inspection process, it is necessary to simultaneously apply the inspection liquid to the surface of the parts to ensure inspection accuracy, but manual application is difficult to achieve even and continuous application, further affecting the reliability of the inspection results; third, manual inspection cannot achieve automated feeding, transmission, classification, and data recording, making it difficult to meet the online full inspection requirements of large-scale production lines.

[0004] Therefore, there is an urgent need for a testing device and method that can automatically transport tungsten-cobalt cemented carbide blanks, automatically spray testing liquid, automatically perform multi-point testing, and automatically sort them. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for detecting internal defects in tungsten cobalt cemented carbide blanks, so as to solve the problems of low efficiency and high strength in existing part inspection.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A device for detecting internal defects in tungsten cobalt cemented carbide blanks includes a test housing. The upper end of the test housing has a transmission cavity containing two parallel first and second conveying rods. The first and second conveying rods are rotatably connected to the test housing at both ends. Both the first and second conveying rods have transmission threads. A transmission gap matching the tungsten cobalt alloy rod is provided between the first and second conveying rods. The rotation speeds of the first and second conveying rods are different. The test housing also includes a multi-point detection assembly for detecting the surface of the tungsten cobalt alloy rod. The first and second conveying rods are connected to a drive assembly for rotating them, allowing the first and second conveying rods to rotate asynchronously. A feeding notch is provided on one side of the feeding end of the test housing, and a matching feeding guide plate is provided at the feeding notch. A feeding assembly for intermittently supplying the tungsten cobalt alloy rod is provided at the feeding guide plate. An unloading outlet is provided at the end of the test housing to facilitate the discharge of the tungsten cobalt alloy rod. A spraying assembly for spraying detection liquid onto the surface of the tungsten cobalt alloy rod in the transmission gap is located above the test housing. Further embodiment: The multi-point detection component, drive component, unloading component, and spraying component are electrically connected to the control panel; Further solution: The multi-point detection component includes a detection plate, which is positioned obliquely above the transmission gap to avoid being splashed by the detection liquid. The detection plate has multiple equally spaced detection probes on the side facing the tungsten-cobalt alloy rod. Further embodiment: The spraying assembly includes a coating tube arranged above the transmission gap, with multiple spray nozzles distributed on the lower surface of the coating tube. The surface of the tungsten cobalt alloy rod will be uniformly covered with the test liquid. The two sides of the coating tube are connected to the test shell through coating brackets. The liquid inlet end of the coating tube is connected to the liquid supply pipe, and the other end of the liquid supply pipe is connected to the output end of the circulation pump. The liquid extraction end of the liquid supply pipe is connected to the filter box assembly, and the upper end of the filter box assembly is connected to the liquid return end of the test shell. Further solution: The unloading outlet is equipped with an unloading assembly for collecting tungsten cobalt alloy rods. The unloading assembly includes a second collection chamber for collecting qualified tungsten cobalt alloy rods and a first collection chamber for collecting unqualified tungsten cobalt alloy rods. A transfer plate is provided between the first and second collection chambers. A central frame is provided at the bottom center of the transfer plate. Unloading brackets are rotatably provided at both ends of the central frame. A connecting shaft is provided between the two unloading brackets. A telescopic push rod is rotatably provided on the connecting shaft. The output end of the telescopic push rod is rotatably connected to the bottom support block of the transfer plate. Further embodiment: The drive assembly includes a drive shaft connected to the shaft end of the first conveying rod, a first gear on the drive shaft, the other end of the drive shaft connected to the output end of a reducer, the input end of the reducer being driven by a drive motor, a second gear on the shaft end of the second conveying rod, the second gear meshing with the drive shaft, and the diameters of the second gear and the drive shaft being different; Further embodiment: The feeding assembly includes a feeding slide for supporting tungsten cobalt alloy rods. The feeding slide has baffles on both sides at its upper end. The supporting surface of the feeding slide is inclined toward the test shell. A vertically arranged baffle is provided near the test shell of the feeding slide. The top of the vertical baffle is connected to the feeding guide plate. A sliding notch corresponding to the vertical baffle is opened on the feeding slide. A reciprocating slider is provided at the position of the sliding notch. The upper end of the reciprocating slider is inclined toward the vertical baffle. The reciprocating slider is connected to a reciprocating pusher for driving its up and down reciprocating motion. Further embodiment: The reciprocating pusher includes multiple guide posts disposed at the lower end of the reciprocating slider. A return spring is sleeved on the outer side of each guide post. The guide posts are slidably disposed with sliding holes on the reciprocating slider. The return spring connects the reciprocating slider to the base. A pusher rack is disposed on the outer side of the reciprocating slider. One side of the pusher rack meshes with a pusher gear. The pusher gear is disposed at one end of the reciprocating shaft. The reciprocating shaft is rotatably disposed on the reciprocating bracket. A third gear is disposed at the other end of the reciprocating shaft. A coaxial half gear is disposed on the outer side of the second gear. The half gear is an incomplete gear.

[0007] The present invention has the following beneficial effects: The feeding assembly and conveyor rod of this invention are powered by the same drive assembly. Through the intermittent meshing of half-gears and gears, the conveyor rod is driven to rotate while intermittent single-rod feeding is automatically achieved. This linkage design requires only one drive source to simultaneously complete feeding, conveying, and tumbling operations, eliminating the need for an additional independent feeding power system and control logic. It features a compact structure, reliable transmission, and significantly reduces equipment manufacturing costs and control complexity. Furthermore, the entire process eliminates the need for manual rotation or positioning of parts, achieving continuous automatic feeding, conveying, detection, and sorting operations. This greatly reduces the labor intensity of operators and avoids problems such as missed inspections, duplicate inspections, and inconsistent inspection positions that are easily caused by manual operation.

[0008] The spraying assembly of this invention, while uniformly applying the detection liquid, allows the continuously flowing detection liquid to effectively wash away and remove oil, scale, dust, and cutting residue adhering to the surface of the tungsten-cobalt alloy rod, thus achieving a surface cleaning effect. The clean surface ensures good coupling between the detection probe and the rod (such as ultrasonic coupling or eddy current electromagnetic coupling), eliminating spurious signals or signal attenuation caused by surface contaminants. Furthermore, the detection liquid is circulated and purified in real-time by a filter assembly, ensuring it always acts on the rod surface in a clean state, further preventing secondary contamination. Therefore, the detection liquid in this device not only serves as a penetration detection or coupling medium but also has an online cleaning function, improving the authenticity of the detection signal and the accuracy of defect identification from the source.

[0009] This invention employs two conveyor rods with different rotational speeds and a transmission thread, causing the tungsten-cobalt alloy rod to continuously tumble during axial transmission. This ensures that the entire outer circumference of the rod passes sequentially through multiple equally spaced detection probes, achieving bidirectional full-coverage inspection in both the circumferential and axial directions. This overcomes the shortcomings of traditional manual point-by-point inspection, which struggles to completely cover the circumferential direction. Multiple probes simultaneously collect defect signals from different axial positions, allowing for multi-point inspection of the entire rod in a single transmission, significantly improving inspection efficiency compared to manual point-by-point inspection. The unloading assembly automatically sends qualified and unqualified products to different collection bins based on real-time judgment results from the control panel, integrating inspection and sorting. This eliminates the need for manual secondary sorting and avoids the risk of product mixing. The entire device has a modular structure, occupies a small space, and is suitable for online full inspection of tungsten-cobalt cemented carbide rods of different diameters, demonstrating significant industrial application value. Attached Figure Description

[0010] Figure 1 This is a structural diagram of one side of the present invention.

[0011] Figure 2 This is a structural diagram of the other side of the present invention.

[0012] Figure 3 For the present invention Figure 1 The structural diagram of A in the middle.

[0013] Figure 4 This is a structural diagram of the driving component of the present invention.

[0014] Figure 5 This is a structural diagram of the first and second conveying rods of the present invention.

[0015] Figure 6 This is a structural diagram of the unloading assembly of the present invention.

[0016] Figure 7 This is a structural diagram of the feeding chute of the present invention.

[0017] Figure 8 This is a flowchart of the detection process of the present invention.

[0018] In the figure: test housing 100, control panel 101, transmission thread 102, first conveyor rod 103, second conveyor rod 104, unloading outlet 105, loading notch 106, loading guide plate 107; Unloading assembly 200, first collection bin 201, second collection bin 202, transfer plate 203, telescopic push rod 204, unloading bracket 205, connecting shaft 206, center frame 207; Application tube 300, spray head 301, application bracket 302, liquid supply pipe 303, circulation pump 304, filter box assembly 305; Feeding slide 400, reciprocating slider 401, guide column 402, return spring 403, vertical baffle 404; Drive assembly 500, drive motor 501, reducer 502, first gear 503, drive shaft 504, second gear 505, half gear 506, third gear 507, reciprocating bracket 508, reciprocating rotating shaft 509, pusher gear 510, pusher rack 511; 600 tungsten-cobalt alloy rod; Detection plate 700, detection probe 701. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] refer to Figures 1-8 As shown, the device for detecting internal defects in a tungsten cobalt cemented carbide blank includes a test housing 100. The upper end of the test housing 100 has a transmission cavity containing two parallel first conveying rods 103 and second conveying rods 104. The two ends of the first conveying rods 103 and second conveying rods 104 are rotatably connected to the test housing 100, and both have uniformly distributed transmission threads 102. A transmission gap matching the outer diameter of the tungsten cobalt alloy rod 600 is formed between the first conveying rods 103 and second conveying rods 104.

[0021] When the tungsten cobalt alloy rod 600 is placed in the transmission gap, the first conveying rod 103 and the second conveying rod 104 rotate under the drive assembly 500. The friction and thrust between the transmission thread 102 and the surface of the tungsten cobalt alloy rod 600 work together to move the tungsten cobalt alloy rod 600 axially along the transmission gap. Specifically, the rotational speeds of the first conveying rod 103 and the second conveying rod 104 are set to be inconsistent (e.g., achieved through gear transmissions of different diameters). This difference in rotational speed causes the tungsten cobalt alloy rod 600 to continuously tumble around its own axis while moving axially. The benefits of tumbling include: The entire outer circumferential surface of the tungsten cobalt alloy rod 600 is sequentially passed through the subsequent spraying and testing components to achieve full circumferential coverage testing; the transmission thread 102 can scrape off oil, oxides or dust adhering to the surface of the tungsten cobalt alloy rod 600 during relative movement, improving the accuracy of testing; it avoids local accumulation or loss of testing liquid due to static contact, ensuring uniform coating of testing liquid.

[0022] The test housing 100 is also equipped with a multi-point detection component for detecting the surface of the tungsten-cobalt alloy rod 600. The multi-point detection component can intermittently or continuously detect different axial positions and different circumferential angles of the tungsten-cobalt alloy rod 600 in the tumbling state, thereby ensuring full coverage and reliability of the detection.

[0023] The first conveying rod 103 and the second conveying rod 104 are connected to a drive assembly 500 for rotating them, enabling asynchronous rotation of the two conveying rods. A feeding notch 106 is provided on one side of the feeding end of the test housing 100, and a matching feeding guide plate 107 is provided at the position of the feeding notch 106. A feeding assembly for intermittently supplying tungsten cobalt alloy rods 600 is provided at the position of the feeding guide plate 107. A discharge outlet 105 is provided at the end of the test housing 100 to facilitate the discharge of the tungsten cobalt alloy rods 600. A spraying assembly for spraying detection liquid onto the surface of the tungsten cobalt alloy rods 600 in the transmission gap is provided above the test housing 100. The spraying assembly can uniformly coat the surface of the tungsten cobalt alloy rods 600 with detection liquid, and the flowing detection liquid can also help wash away impurities on the surface of the tungsten cobalt alloy rods 600.

[0024] The multi-point detection component, drive component 500, unloading component 200 and spraying component are all electrically connected to control panel 101 to achieve automated collaborative control.

[0025] The multi-point detection assembly includes a detection plate 700, which is positioned obliquely above the transmission gap. Its installation position and angle should ensure that the detection plate 700 is not directly splashed by the detection liquid from the spraying assembly, while simultaneously allowing the detection probes 701 to maintain appropriate contact or proximity to the surface of the tungsten-cobalt alloy rod 600. Multiple equally spaced detection probes 701 are arranged on the side of the detection plate 700 facing the tungsten-cobalt alloy rod 600. Because the detection plate 700 has multiple detection probes 701, and these probes are equally spaced along the axial direction of the tungsten-cobalt alloy rod 600, when the tungsten-cobalt alloy rod 600 moves at a constant speed in a tumbling state, each detection probe 701 can correspond to different axial sections of the rod, thereby completing synchronous detection of multiple points on the entire surface of the rod during a single transmission process, significantly improving detection efficiency.

[0026] Preferably, the detection probe 701 can be a high-frequency ultrasonic probe, an eddy current probe, or a laser ultrasonic probe. When an eddy current probe is used, it can detect surface and near-surface cracks, pores, and other conductive discontinuities; when a high-frequency ultrasonic probe is used (which requires water film coupling), it can detect subsurface micropores.

[0027] The spraying assembly includes a coating tube 300 positioned above the transmission gap, with multiple spray heads 301 distributed on its lower surface. The spray heads 301 uniformly spray the test liquid onto the top surface of the tungsten-cobalt alloy rod 600. As the rod 600 continues to tumble, the test liquid is evenly covered across its entire outer circumference. Both sides of the coating tube 300 are connected to the test housing 100 via coating supports 302. The inlet end of the coating tube 300 is connected to a supply pipe 303, the other end of which is connected to the output end of a circulation pump 304. The pumping end of the circulation pump 304 is connected to a filter assembly 305, and the upper end of the filter assembly 305 is connected to the return end at the bottom of the test housing 100.

[0028] The test solution is drawn from the filter assembly 305 by the circulating pump 304 and sent into the application tube 300. The test solution is then evenly sprayed onto the top of the tungsten-cobalt alloy rod 600 through the spray nozzle 301. The dripping test solution collects at the bottom of the test housing 100 and then flows back into the filter assembly 305 along the return end. The filter assembly 305 has a multi-stage filtration system (such as a filter screen, magnetic filter, sedimentation tank, etc.) to filter the test solution, removing abrasive particles, oil, and impurities washed off the surface of the tungsten-cobalt alloy rod 600, thus enabling the recycling of the test solution. This circulating test solution not only saves on testing costs but also continuously removes contaminants from the surface of the rod, ensuring the consistency of the testing interface.

[0029] Detection Fluid Type and Selection: The detection fluid used in this device is selected based on the detection principle employed. As a preferred option, the detection fluid is a fluorescent penetrant (water-washable or post-emulsified type), used in conjunction with ultraviolet light irradiation and an optical probe to provide clear fluorescent indication of surface opening defects. As another preferred option, the detection fluid is a colored penetrant (red dye), suitable for online detection in workshops where a darkroom environment is not required. When the detection probe 701 uses an eddy current probe, a water-based coupling fluid with moderate conductivity (e.g., tap water with added rust inhibitor or a special eddy current coupling agent) can be selected to improve the electromagnetic coupling stability between the probe and the workpiece. When the detection probe 701 uses an ultrasonic probe, an ultrasonic coupling fluid (e.g., water, glycerin aqueous solution, or a special ultrasonic coupling adhesive) is selected to eliminate air gaps and ensure effective sound energy transmission. This specific embodiment uses a fluorescent penetrant as an example; its main components are water-soluble fluorescent dye, surfactant, and rust inhibitor, which are harmless to humans and easy to clean.

[0030] The unloading outlet 105 is equipped with an unloading assembly 200 for sorting and collecting tungsten cobalt alloy rods 600. The unloading assembly 200 includes a second collection chamber 202 for collecting qualified tungsten cobalt alloy rods 600 and a first collection chamber 201 for collecting unqualified tungsten cobalt alloy rods 600. A transfer plate 203 is provided between the first collection chamber 201 and the second collection chamber 202. A central frame 207 is located at the bottom center of the transfer plate 203, and unloading brackets 205 are rotatably mounted at both ends of the central frame 207. A connecting shaft 206 is mounted between the two unloading brackets 205, and a telescopic push rod 204 is rotatably mounted on the connecting shaft 206. The output end of the telescopic push rod 204 is rotatably connected to a support block at the bottom of the transfer plate 203. By extending or retracting the telescopic push rod 204, the transfer plate 203 can be rotated around the central frame 207, causing the transfer plate 203 to tilt toward the first collection bin 201 or toward the second collection bin 202, thereby guiding qualified and unqualified products to the corresponding collection bins according to the test results.

[0031] The drive assembly 500 includes a drive shaft 504 connected to the shaft end of the first conveying rod 103, and a first gear 503 is provided on the drive shaft 504. The other end of the drive shaft 504 is connected to the output end of a reducer 502, and the input end of the reducer 502 is driven by a drive motor 501. A second gear 505 is provided at the shaft end of the second conveying rod 104, and the second gear 505 meshes with the first gear 503 on the drive shaft 504. The pitch circle diameters of the second gear 505 and the first gear 503 are set to different values, so that the first conveying rod 103 and the second conveying rod 104 obtain different angular velocities at the same input speed, thereby generating the aforementioned speed difference, driving the tungsten cobalt alloy rod 600 to continuously tumble during movement.

[0032] The feeding assembly includes a feeding slide 400 for supporting the tungsten cobalt alloy rod 600. The upper ends of the feeding slide 400 are provided with side guards to prevent the tungsten cobalt alloy rod 600 from rolling off. The supporting surface of the feeding slide 400 is inclined towards the test housing 100. A vertically arranged vertical baffle 404 is provided near the test housing 100 on the feeding slide 400, and the top of the vertical baffle 404 is connected to the feeding guide plate 107. A sliding notch corresponding to the vertical baffle 404 is provided on the feeding slide 400, and a reciprocating slider 401 is fitted at the sliding notch position. The upper end of the reciprocating slider 401 is inclined towards the vertical baffle 404 to stably support the rolling tungsten cobalt alloy rod 600. The reciprocating slider 401 is connected to a reciprocating pusher for driving its up-and-down reciprocating motion.

[0033] Under the influence of gravity, the tungsten cobalt alloy rod 600 rolls downwards along the surface of the feeding slide 400 until the foremost tungsten cobalt alloy rod 600 comes into contact with the surface of the vertical baffle 404. A reciprocating pusher drives the reciprocating slider 401 upwards, lifting the tungsten cobalt alloy rod 600 at the top of the reciprocating slider 401. When the tungsten cobalt alloy rod 600 is pushed to its highest position, its height exceeds the upper edge of the vertical baffle 404, and it then slides along the feeding guide plate 107 and enters the transmission gap inside the test housing 100 through the feeding notch 106.

[0034] The reciprocating pusher includes multiple guide posts 402 disposed at the lower end of the reciprocating slider 401, with a return spring 403 sleeved on the outer side of each guide post 402. The guide posts 402 are slidably engaged with sliding holes on the reciprocating slider 401. The return spring 403 elastically connects the reciprocating slider 401 to the base. A pusher rack 511 is fixedly disposed on the outer side of the reciprocating slider 401, and one side of the pusher rack 511 meshes with a pusher gear 510. The pusher gear 510 is disposed at one end of a reciprocating shaft 509, which is rotatably mounted on a reciprocating bracket 508. A third gear 507 is disposed at the other end of the reciprocating shaft 509. A coaxially fixed half gear 506 is disposed on the outer side of the second gear 505, and the half gear 506 is an incomplete gear (i.e., only a portion of its circumference is machined with teeth). The half gear 506 intermittently meshes with the third gear 507.

[0035] When the drive assembly 500 is working, the half gear 506 rotates synchronously with the second gear 505. When the toothed part of the half gear 506 meshes with the third gear 507, it drives the third gear 507 to rotate at a certain angle. The third gear 507 drives the pusher gear 510 to rotate synchronously through the reciprocating shaft 509. The pusher gear 510 drives the reciprocating slider 401 to move upward through the pusher rack 511. After the toothed part of the half gear 506 has rotated and disengaged from the third gear 507, under the combined action of the spring force of the return spring 403 and the weight of the reciprocating slider 401, the reciprocating slider 401 slides downward to reset, and its top retracts below the support surface of the feeding slide 400. At this time, the next tungsten cobalt alloy rod 600 automatically rolls to the top position of the reciprocating slider 401 under the action of gravity, waiting for the next feeding action. This cycle is repeated to achieve intermittent and automated single-rod feeding.

[0036] The detection principle is as follows: As the tungsten-cobalt alloy rod 600 advances and tumbles in the transport gap, the spraying assembly first uniformly covers its surface with a layer of detection liquid. Taking fluorescent penetrant testing as an example: the detection liquid penetrates into the defects (such as cracks, pores, scratches, etc.) on the surface of the rod under capillary action. After a short penetration time (usually 5-15 minutes, which is controlled by adjusting the transport speed in this device), the detection liquid has fully filled the defects. Subsequently, at the testing station, multiple detection probes 701 mounted on the detection plate 700 can use an ultraviolet light irradiation device (in conjunction with an optical probe) or an eddy current probe for signal excitation and reception.

[0037] If the fluorescence penetrant detection principle is used: the detection probe 701 includes an ultraviolet light source and a photoelectric sensor. When ultraviolet light shines on the surface of the tungsten-cobalt alloy rod 600, the residual fluorescent penetrant in the defect is excited and emits visible fluorescence (usually yellow-green). The photoelectric sensor captures the fluorescence intensity signal. Defect-free areas, due to the absence of residual penetrant or extremely low background fluorescence, output a low-level signal; defective areas output a high-level signal. The control panel 101 determines the location, size, and severity of the defect based on the intensity, duration, and distribution of the signals from each probe.

[0038] If the eddy current testing principle is used: the detection probe 701 is a differential eddy current coil. When there are cracks or holes on the surface of the tungsten-cobalt alloy rod 600, it will cause local eddy current field distortion, causing changes in the real and imaginary parts of the coil impedance. By analyzing the signal amplitude and phase in the impedance plane diagram, the control panel 101 can identify defects and preliminarily determine their type (crack or porosity).

[0039] If the high-frequency ultrasonic testing principle is used: the testing probe 701 is a small-aperture water immersion focused ultrasonic probe, and the testing fluid also acts as a coupling agent. Ultrasonic waves are transmitted through the testing fluid layer into the tungsten-cobalt alloy rod 600, and are reflected back when they encounter the defect interface. The control panel 101 calculates the depth and equivalent size of the defect based on the echo duration and amplitude.

[0040] This device uses multiple equally spaced detection probes 701 to simultaneously acquire detection data at multiple axial positions of the tungsten-cobalt alloy rod 600 during a single transmission process. Combined with the tumbling motion of the rod 600, each probe effectively completes a spiral scan of the rod's entire outer surface, achieving near 100% coverage detection. The control panel 101 is pre-set with defect judgment thresholds or machine learning models based on standard samples, capable of converting detection signals into defect judgment results (pass / fail) in real time and driving the unloading assembly 200 to perform sorting operations.

[0041] Workflow: The tungsten cobalt alloy rod 600 to be tested is placed at the upper end of the feeding chute 400. Under the action of gravity, multiple tungsten cobalt alloy rods 600 are closely arranged and roll downwards. The foremost tungsten cobalt alloy rod 600 contacts the vertical baffle 404. The drive motor 501 drives the first conveying rod 103 and the second conveying rod 104 to rotate through the reducer 502 and the drive shaft 504. At the same time, the half gear 506 rotates synchronously with the second gear 505. When the half gear 506 meshes with the third gear 507, the reciprocating slider 401 rises, lifting a tungsten cobalt alloy rod 600 and sending it into the transmission gap. Subsequently, the half gear 506 disengages, the reciprocating slider 401 resets, and the next tungsten cobalt alloy rod 600 automatically enters the position.

[0042] The tungsten-cobalt alloy rod 600, entering the transmission gap, moves axially while tumbling around its own axis, driven by the speed difference between the first conveying rod 103 and the second conveying rod 104. The circulating pump 304 draws the test liquid from the filter assembly 305 and sprays it evenly onto the top surface of the tungsten-cobalt alloy rod 600 through the coating pipe 300 and the spray head 301. As the rod tumbles, the test liquid evenly covers the entire outer circumference. Excess test liquid and washed-down impurities fall to the bottom of the test housing 100 and flow back to the filter assembly 305 for circulation and purification.

[0043] When the tungsten-cobalt alloy rod 600 moves below the detection plate 700, multiple detection probes 701 operate simultaneously, collecting defect signals at different axial positions of the rod. The control panel 101 processes these signals in real time and determines whether the rod is qualified based on a preset detection model (such as threshold comparison or neural network classification). After the detection is completed, the rod continues to move to the unloading outlet 105. Based on the judgment result, the control panel 101 issues a command, the telescopic push rod 204 actuates, driving the transfer plate 203 to tilt towards the corresponding collection bin, sending qualified products into the second collection bin 202 and unqualified products into the first collection bin 201.

[0044] The entire process is automatically coordinated and controlled by the control panel 101, realizing continuous automatic feeding, spraying, detection, and sorting of tungsten cobalt cemented carbide rods without manual intervention, which significantly improves detection efficiency and consistency.

[0045] To ensure the long-term performance of the test solution, the filter element in the filter assembly 305 should be replaced regularly, and fresh test solution should be added as needed to compensate for losses due to evaporation and carryover. When using fluorescent penetrant, prolonged exposure of the test solution to natural light or strong white light should be avoided to prevent photo-fading of the fluorescent dye. The inner wall of the test housing 100 and the transmission components should preferably be made of dark-colored, non-fluorescent materials or coatings to reduce background interference.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 device for detecting internal defects in tungsten-cobalt cemented carbide blanks, comprising a test housing (100), wherein a transmission cavity is provided at the upper end of the test housing (100), characterized in that, The transmission cavity is equipped with two parallel first conveying rods (103) and second conveying rods (104). Both ends of the first conveying rods (103) and second conveying rods (104) are rotatably connected to the test housing (100). Both the first conveying rods (103) and second conveying rods (104) have transmission threads (102). A transmission gap matching the tungsten cobalt alloy rod (600) is provided between the first conveying rods (103) and second conveying rods (104). The rotation speeds of the first conveying rods (103) and second conveying rods (104) are inconsistent. The test housing (100) is also equipped with a multi-point detection assembly for detecting the surface of the tungsten cobalt alloy rod (600). The feed rod (104) is connected to a drive assembly (500) for rotating it. The drive assembly (500) allows the first feed rod (103) and the second feed rod (104) to rotate asynchronously. The test housing (100) has a feed notch (106) on one side of the feed end. A feed guide plate (107) is provided at the position of the feed notch (106). A feed assembly for intermittently providing tungsten cobalt alloy rods (600) is provided at the position of the feed guide plate (107). The test housing (100) has a discharge outlet (105) at the end to facilitate the discharge of tungsten cobalt alloy rods (600). A spraying assembly for spraying test liquid onto the surface of tungsten cobalt alloy rods (600) in the transmission gap is provided above the test housing (100).

2. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 1, characterized in that, The multi-point detection assembly includes a detection plate (700), which is positioned obliquely above the transmission gap to avoid being splashed by the detection liquid. The detection plate (700) has multiple equally spaced detection probes (701) on the side facing the tungsten cobalt alloy rod (600).

3. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 1, characterized in that, The spraying assembly includes a coating tube (300) arranged above the transmission gap. Multiple spray nozzles (301) are distributed on the lower surface of the coating tube (300). The surface of the tungsten cobalt alloy rod (600) will be uniformly covered with the test liquid. The two sides of the coating tube (300) are connected to the test shell (100) through coating brackets (302). The liquid inlet end of the coating tube (300) is connected to the liquid supply pipe (303). The other end of the liquid supply pipe (303) is connected to the output end of the circulation pump (304). The liquid extraction end of the liquid supply pipe (303) is connected to the filter box assembly (305). The upper end of the filter box assembly (305) is connected to the liquid return end of the test shell (100).

4. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 1, characterized in that, The discharge outlet (105) is provided with a discharge assembly (200) for collecting tungsten cobalt alloy rods (600). The discharge assembly (200) includes a second collection chamber (202) for collecting qualified tungsten cobalt alloy rods (600) and a first collection chamber (201) for collecting unqualified tungsten cobalt alloy rods (600). A transfer plate (203) is provided between the first collection chamber (201) and the second collection chamber (202). A central frame (207) is provided at the bottom center of the transfer plate (203). Discharge brackets (205) are rotatably provided at both ends of the central frame (207). A connecting shaft (206) is provided between the two discharge brackets (205). A telescopic push rod (204) is rotatably provided on the connecting shaft (206). The output end of the telescopic push rod (204) is rotatably connected to the bottom support block of the transfer plate (203).

5. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 1, characterized in that, The drive assembly (500) includes a drive shaft (504) connected to the shaft end of the first conveying rod (103). A first gear (503) is provided on the drive shaft (504). The other end of the drive shaft (504) is connected to the output end of the reducer (502). The input end of the reducer (502) is driven by a drive motor (501). A second gear (505) is provided at the shaft end of the second conveying rod (104). The second gear (505) meshes with the drive shaft (504). The diameters of the second gear (505) and the drive shaft (504) are different.

6. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 5, characterized in that, The feeding assembly includes a feeding slide (400) for carrying a tungsten cobalt alloy rod (600). The feeding slide (400) has baffles on both sides at its upper end. The supporting surface of the feeding slide (400) is inclined toward the test shell (100). A vertical baffle (404) is provided at the position of the feeding slide (400) near the test shell (100). The top of the vertical baffle (404) is connected to the feeding guide plate (107). A sliding notch corresponding to the vertical baffle (404) is opened on the feeding slide (400). A reciprocating slider (401) is provided at the position of the sliding notch. The upper end of the reciprocating slider (401) is inclined toward the vertical baffle (404). The reciprocating slider (401) is connected to a reciprocating pusher for driving its up and down reciprocating motion.

7. The device for detecting internal defects in tungsten-cobalt cemented carbide blanks according to claim 6, characterized in that, The reciprocating pusher includes multiple guide posts (402) disposed at the lower end of the reciprocating slider (401). A return spring (403) is sleeved on the outside of the guide post (402). The guide post (402) is slidably disposed with the sliding hole on the reciprocating slider (401). The return spring (403) connects the reciprocating slider (401) to the base. A pusher rack (511) is disposed on the outside of the reciprocating slider (401). One side of the pusher rack (511) meshes with a pusher gear (510). The pusher gear (510) is disposed at one end of the reciprocating shaft (509). The reciprocating shaft (509) is rotatably disposed on the reciprocating bracket (508). A third gear (507) is disposed at the other end of the reciprocating shaft (509). A coaxial half gear (506) is disposed on the outside of the second gear (505). The half gear (506) is an incomplete gear.

8. A detection method for an apparatus for detecting internal defects in tungsten-cobalt cemented carbide blanks according to any one of claims 1-7, characterized in that, Includes the following steps: S1: The tungsten cobalt alloy rod (600) is intermittently fed into the transmission gap at the feeding end of the test shell (100) by the feeding assembly. The transmission gap is composed of two parallel first conveying rods (103) and second conveying rods (104) with different rotation speeds. Both the first conveying rod (103) and the second conveying rod (104) have transmission threads (102). S2: Start the drive assembly (500) to drive the first conveying rod (103) and the second conveying rod (104) to rotate at different speeds, so that the tungsten cobalt alloy rod (600) moves axially in the transmission gap while tumbling around its own axis. S3: The test liquid is uniformly sprayed onto the surface of the tungsten cobalt alloy rod (600) in a tumbling state using the spraying assembly; S4: The surface of the tungsten cobalt alloy rod (600) during the tumbling process is inspected at multiple points using a multi-point inspection component to obtain inspection data; S5: The control panel (101) determines whether the current tungsten cobalt alloy rod (600) is a qualified product or an unqualified product based on the detection data; S6: After the tungsten cobalt alloy rod (600) moves to the unloading outlet (105) at the end of the test housing (100), the unloading assembly (200) sends the tungsten cobalt alloy rod (600) into the qualified product collection bin or the illegal product collection bin according to the judgment result of the control panel (101).

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