Magnetic tile internal crack defect detection device for simulating generation of damp and hot air in human lung

Abstract

The invention discloses a magnetic tile internal crack defect detection device capable of simulating generation of damp and hot air in human lung. The damp and hot gas generation mechanism is located on the side of the rack, one end of the damp and hot gas generation mechanism extends into the environment detection mechanism and is used for spraying damp and hot gas to the surfaces of the magnetic shoes in the environment detection mechanism, and the conveying belt and the environment detection mechanism are both installed on the upper surface of the rack; the feeding end of the conveying belt is provided with a limiter used for limiting the placement position of the magnetic shoe, and the environment detection mechanism is installed above the conveying belt, connected with the upper surface of the rack, covers a section of conveying area of the conveying belt and is used for observing water mist distribution and detecting the inner crack defect of the magnetic shoe. The device adopts a novel nondestructive testing method to ensure that water mist uniformly covers the surface of the magnetic tile to detect the defects such as cracks and air holes in the magnetic tile through differential pressure-temperature difference synergistic adsorption, so that the manual detection efficiency is improved, and the device is suitable for industrial quality inspection of magnetic materials.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial non-destructive testing, and particularly to a device for detecting internal crack defects in magnetic tiles by simulating the humid and hot air generated by the human lung. Background Art

[0002] Currently, the detection of magnetic tile defects mainly relies on manual visual inspection or traditional optical equipment. Manual detection has low efficiency and strong subjectivity, and it is difficult to quantify micron-level cracks; although optical detection equipment can be automated, it is not sensitive to the differences in surface volatilization characteristics and is significantly affected by environmental temperature and humidity. Existing spray detection devices cannot simulate the temperature and humidity characteristics of human exhalation, resulting in poor detection consistency. Therefore, there is an urgent need for a high-precision and high-reliability bionic automated detection scheme. Summary of the Invention

[0003] To solve the problems in the background art, the present invention provides a device for detecting internal crack defects in magnetic tiles based on simulating the humid and hot air generated by the human lung, a magnetic tile defect detection device and method that combine machine vision to quantify defect features, and solve the problems of low efficiency and insufficient sensitivity in the prior art.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The present invention is used to spray humid and hot gas on the surface of the magnetic tile to form water mist, and detect the internal crack defects of the magnetic tile by observing the water mist distribution. It includes a frame, a humid and hot gas generating mechanism, an environmental detection mechanism, a stopper, and a conveyor belt. The humid and hot gas generating mechanism is located on the side of the frame, and one end of the humid and hot gas generating mechanism extends into the internal part of the environmental detection mechanism, and is used to generate heated and humidified gas and then spray it on the surface of the magnetic tile inside the environmental detection mechanism to form water mist. The conveyor belt and the environmental detection mechanism are both installed on the upper surface of the frame. The conveyor belt is used to place and convey the magnetic tile, and a stopper for restricting the placement position of the magnetic tile is installed at the loading end of the conveyor belt. The environmental detection mechanism is installed above the conveyor belt and is connected to the upper surface of the frame, covering a section of the conveying area of the conveyor belt, and is used to observe the water mist distribution and detect the internal crack defects of the magnetic tile.

[0006] The humid and hot gas generating mechanism includes a micro air pump, an electro-pneumatic proportional valve, a heating component, a humidifying component, a pressure sensor, a gas temperature sensor, and a nozzle. The output port of the micro air pump is connected to the input port of the heating component through a pipeline. An electro-pneumatic proportional valve for adjusting the gas flow is installed on the pipeline between the micro air pump and the heating component. The output port of the heating component is connected to the input port of the humidifying component through a pipeline. The output port of the humidifying component is connected to the nozzle through a pipeline extending into the internal part of the environmental detection mechanism. A pressure sensor and a gas temperature sensor are arranged on the pipeline between the humidifying component and the nozzle. The pressure sensor is electrically connected to the micro air pump, the gas temperature sensor is electrically connected to the heating component, and the humidifying component and the electro-pneumatic proportional valve are electrically connected.

[0007] The heating component includes a heating cavity, a three-layer spiral fin, a PTC heating sheet, and a hot air temperature sensor. The input port of the heating cavity serves as the input port of the heating component and is connected to the output port of the micro air pump through a pipeline. An electric proportional valve is installed on the pipeline between the heating cavity and the micro air pump. The output port of the heating cavity serves as the output port of the heating component and is connected to the humidifying component through a pipeline.

[0008] Inside the heating cavity, there are a three-layer spiral fin, a PTC heating sheet, and a hot air temperature sensor. The three-layer spiral fin is rotatably arranged along the axial direction of the heating cavity inside the heating cavity to guide the gas to rotate and flow to adjust the gas flow rate. A number of PTC heating sheets are attached to the surface of the three-layer spiral fin to heat the gas flowing through the three-layer spiral fin. The hot air temperature sensor is used to monitor the temperature inside the heating cavity. Both the gas temperature sensor and the hot air temperature sensor are electrically connected to the PTC heating sheet.

[0009] The humidifying component includes an atomization chamber, an ultrasonic atomization sheet, a water injection port, a liquid level sensor, a mixing cavity, a spiral guide vane, a heating belt, and a humidity sensor. The input port of the mixing cavity serves as the input port of the humidifying component and is respectively connected to the output port of the heating cavity and the output port of the atomization chamber. The output port of the mixing cavity serves as the output port of the humidifying component and is connected to the spray nozzle through a pipeline. A pressure sensor and a gas temperature sensor are arranged on the pipeline between the output port of the mixing cavity and the spray nozzle.

[0010] The ultrasonic atomization sheet, the water injection port, and the liquid level sensor are all arranged inside the atomization chamber. The ultrasonic atomization sheet is installed at the bottom of the atomization chamber, and the water injection port is arranged on the lower side wall of the atomization chamber. The liquid level sensor is used to monitor the liquid level in the atomization chamber.

[0011] The spiral guide vane and the humidity sensor are both arranged inside the mixing cavity. The spiral guide vane is rotatably arranged along the axial direction of the mixing cavity inside the mixing cavity. A number of heating belts are sleeved on the outer side wall of the mixing cavity at intervals in parallel. The humidity sensor is arranged on the side wall of the mixing cavity. The humidity sensor is electrically connected to the electric proportional valve and the ultrasonic atomization sheet respectively.

[0012] The environmental detection mechanism includes a constant-temperature box, a positioning sensor, an exhaust fan, a heating component, a box temperature sensor, and a vision detection component. The positioning sensor, exhaust fan, heating component, box temperature sensor, and vision detection component are all arranged inside the constant-temperature box. The constant-temperature box is installed on the upper surface of the rack. There is a through opening at the lower part of the constant-temperature box, and the conveyor belt passes through the constant-temperature box through the through opening. The constant-temperature box covers a section of the conveying area of the conveyor belt. The positioning sensor and the vision detection component are arranged in sequence along the conveyor belt. The positioning sensor is arranged on one side of the conveyor belt inside the constant-temperature box. The nozzle of the humid and hot gas generating mechanism extends into the constant-temperature box and is arranged opposite to the conveyor belt where the positioning sensor is located. Several vision detection components are arranged around the conveyor belt for taking multi-angle pictures of the magnetic tiles.

[0013] On the side wall of the constant-temperature box, there is a box temperature sensor for monitoring the temperature inside the constant-temperature box, a heating component, and several exhaust fans for realizing the gas exchange inside and outside the constant-temperature box. The box temperature sensor is electrically connected to the heating component and the exhaust fans respectively, and the positioning sensor is electrically connected to the conveyor belt.

[0014] The vision detection component includes an industrial camera, a distance adjustment part, a lifting part, and a camera support. The distance adjustment part, the lifting part, and the industrial camera are installed on the camera support. The lifting part and the distance adjustment part are used to adjust the height of the industrial camera and the horizontal distance from the magnetic tile respectively.

[0015] It also includes an image detection device. The image detection device is electrically connected to the industrial camera for receiving the images taken by the industrial camera and performing defect detection to obtain the defective area of the magnetic tile.

[0016] An opening structure is arranged in the middle of the limiter for guiding the magnetic tile to be placed on the conveyor belt below the opening and realizing the limitation of the magnetic tile.

[0017] A method for detecting internal cracks of magnetic tiles by simulating humid and hot air generation in the human lung includes the following steps:

[0018] S1. Turn on the micro air pump to drive the gas to flow into the humid and hot gas generating mechanism. After the gas is heated and humidified by the heating component and the humidifying component in sequence, it is transported to the nozzle for continuous spraying.

[0019] S2. The box temperature sensor in the environmental detection mechanism performs temperature detection. When the detected temperature is greater than the preset temperature, turn on the exhaust fan to cool the gas inside the constant-temperature box. When the detected temperature is less than the preset temperature, turn on the heating component to heat the gas inside the constant-temperature box until the detected temperature inside the constant-temperature box is constant at the preset temperature.

[0020] S3. Place the magnetic tile on the conveyor belt at the groove of the limiter. The conveyor belt drives the magnetic tile to move into the constant temperature box. When the positioning sensor detects the magnetic tile, the conveyor belt stops conveying, and the nozzle sprays the gas heated and humidified by the heating component and the humidifying component towards the magnetic tile, forming a water mist on the surface of the magnetic tile.

[0021] S4. Subsequently, the industrial camera starts shooting a video. The conveyor belt starts, and the magnetic tile continues to be driven by the conveyor belt and passes through the shooting area of the industrial camera. After a predetermined time, the industrial camera stops shooting the video and transmits the shot video to the image detection device to detect the defects of the magnetic tile to obtain the defective area of the magnetic tile.

[0022] The beneficial effects of the present invention are as follows: By adopting the two-fluid atomization technology (compressed air + deionized water at constant temperature), the core parameters of human exhaled breath are accurately simulated (temperature 36.8 ± 0.3 °C, relative humidity 94.5 ± 1.2%). Through PID closed-loop control, the atomization particle size is stabilized at 10 - 15 μm (close to the droplet size of human mouth exhaled mist). Compared with the traditional magnetic tile defect detection device, the difference in the evaporation rate between the defective area and the non-defective area is more obvious, and the appearance time of the crack boundary is effectively shortened, solving the problem of poor detection consistency caused by environmental simulation distortion. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the magnetic tile internal crack defect detection device based on the simulation of human lung humid and hot air of the present invention.

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the humid and hot gas generating mechanism of the present invention.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the constant temperature box of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the vision detection component of the present invention.

[0027] Figure 5 It is a three-dimensional sectional structural schematic diagram of the heating cavity of the present invention.

[0028] Figure 6 It is a three-dimensional sectional structural schematic diagram of the atomization chamber of the present invention.

[0029] Figure 7 It is a three-dimensional sectional structural schematic diagram of the mixed gas of the present invention.

[0030] In the figure: 10 - tripod, 11 - platform, 20 - conveyor belt, 21 - stopper, 22 - magnetic tile, 23 - positioning sensor, 30 - constant temperature box, 31 - ventilation fan, 32 - heating component, 33 - box temperature sensor, 40 - heating cavity, 41 - three - layer spiral fin, 42 - PTC heating sheet, 43 - hot air temperature sensor, 44 - micro air pump, 45 - electric proportional valve, 50 - atomization chamber, 51 - ultrasonic atomization sheet, 52 - detachable base, 53 - water injection port, 54 - liquid level sensor, 60 - mixing cavity, 61 - spiral guide vane, 62 - heating belt, 63 - humidity sensor, 64 - pressure sensor, 65 - gas temperature sensor, 66 - nozzle, 70 - vision detection component, 71 - industrial camera, 72 - distance - adjusting part, 73 - lifting part, 74 - camera support. Detailed implementation mode

[0031] For the convenience of understanding the present invention, the following will describe the present application more comprehensively with reference to the relevant drawings; the preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0032] The present invention is used to spray humid and hot gas on the surface of the magnetic tile 22 to form water mist, and detect the crack defects in the magnetic tile 22 by observing the distribution of the water mist, such as Figure 1 As shown, the device includes a frame, a humid and hot gas generating mechanism, an environment detecting mechanism, a stopper 21 and a conveyor belt 20. The humid and hot gas generating mechanism is located on the side of the frame and one end of the humid and hot gas generating mechanism extends into the environment detecting mechanism, and is used to generate heated and humidified gas and then spray it on the surface of the magnetic tile (22) inside the environment detecting mechanism to form water mist. The conveyor belt 20 and the environment detecting mechanism are both installed on the upper surface of the frame. The conveyor belt 20 is used to place and convey the magnetic tile 22. A stopper 21 for restricting the placement position of the magnetic tile 22 is installed at the loading end of the conveyor belt 20. The stopper 21 is located above the frame. The environment detecting mechanism is installed above the conveyor belt 20 and is connected to the upper surface of the frame, covering a section of the conveying area of the conveyor belt 20, and is used to observe the distribution of the water mist and detect the crack defects in the magnetic tile 22.

[0033] The magnetic tile 22 is transmitted by the conveyor belt 20 and the stopper 21 into the environment detecting mechanism. The humid and hot gas generating mechanism generates humid and hot gas and sprays it on the surface of the magnetic tile 22 inside the environment detecting mechanism to form water mist, and then the environment detecting mechanism takes pictures and detects the magnetic tile 22, and the defective area of the magnetic tile 22 is obtained after processing.

[0034] The frame includes a tripod 10 and a platform 11. The tripod 10 is installed below the platform 11 to support and fix the platform 11.

[0035] AsFigure 2 As shown, the humid and hot gas generating mechanism includes a micro air pump 44, an electric proportional valve 45, a heating component, a humidifying component, a pressure sensor 64, a gas temperature sensor 65, and a nozzle 66. The output port of the micro air pump 44 is connected to the input port of the heating component through a pipeline. An electric proportional valve 45 for regulating the gas flow rate is installed on the pipeline between the micro air pump 44 and the heating component. The output port of the heating component is connected to the input port of the humidifying component through a pipeline. The output port of the humidifying component is connected to the nozzle 66 through a pipeline extending into the environmental detection mechanism. A pressure sensor 64 and a gas temperature sensor 65 are arranged on the pipeline extending into the environmental detection mechanism between the humidifying component and the nozzle 66. The pressure sensor 64 is electrically connected to the micro air pump 44 and is used to keep the pressure in the nozzle 66 constant. The gas temperature sensor 65 is electrically connected to the heating component, and the humidifying component and the electric proportional valve 45 are electrically connected.

[0036] The pressure sensor 64 correspondingly adjusts the gas flow rate in the micro air pump 44 according to whether the pressure at the nozzle 66 is sufficient, so as to keep the pressure in the nozzle 66 constant;

[0037] The micro air pump 44 inhales gas and adjusts the flow rate through the electric proportional valve 45 and enters the heating component. The gas is heated by the heating component and then transported to the humidifying component through a pipeline. After being humidified and mixed evenly by the humidifying component, it is transported to the nozzle 66 through a pipeline and evenly sprayed onto the surface of the magnetic tile 22 on the conveyor belt 20.

[0038] The heating component includes a heating cavity 40, a three-layer spiral fin 41, a PTC heating sheet 42, and a hot air temperature sensor 43. The input port of the heating cavity 40 serves as the input port of the heating component and is connected to the output port of the micro air pump 44 through a pipeline. The electric proportional valve 45 is installed on the pipeline between the heating cavity 40 and the micro air pump 44. The output port of the heating cavity 40 serves as the output port of the heating component and is connected to the humidifying component through a pipeline;

[0039] As Figure 4As shown in the figure, there are three layers of spiral fins 41, a PTC heating sheet 42, and a hot air temperature sensor 43 arranged inside the heating cavity 40. The three layers of spiral fins 41 are rotatably arranged inside the heating cavity 40 along the axial direction of the heating cavity 40, that is, the gas flow direction, and are used to guide the gas to rotate and flow, adjust the gas flow rate, and improve the heat exchange efficiency. A number of PTC heating sheets 42 are attached to the surface of the three layers of spiral fins 41 and are used to heat the gas flowing through the three layers of spiral fins 41. The hot air temperature sensor 43 is arranged inside the heating cavity 40 near the output port and is used to monitor the temperature inside the heating cavity 40. The gas temperature sensor 65 and the hot air temperature sensor 43 are both electrically connected to the PTC heating sheet 42. The gas temperature sensor 65 and the air temperature sensor 43 jointly control the heating temperature of the PTC heating sheet 42 in the heating component. The output signals of the two temperature sensors are connected in parallel to the control circuit of the heating device. The air temperature sensor 43 controls the temperature of the compressed air inside the heating cavity 40. Whether the temperature of the gas after mixing meets the requirements is detected through the gas temperature sensor 65 and feedback is made to further control the temperature of the heating cavity.

[0040] Specifically, the PTC heating sheet 42 is embedded in the three layers of spiral fins 41 and heats along the gas movement direction. The three layers of spiral fins 41 fix the gas movement trajectory and delay the gas heating time.

[0041] The humidification component includes an atomization chamber 50, an ultrasonic atomization sheet 51, a water injection port 53, a liquid level sensor 54, a mixing chamber 60, a spiral guide vane 61, a heating belt 62, and a humidity sensor 63. The input port of the mixing chamber 60 serves as the input port of the humidification component and is respectively connected to the output port of the heating cavity 40 and the output port of the atomization chamber 50. The output port of the mixing chamber 60 serves as the output port of the humidification component and is connected to the nozzle 66 through a pipeline. A pressure sensor 64 and a gas temperature sensor 65 are arranged on the pipeline extending into the internal environment detection mechanism between the output port of the mixing chamber 60 and the nozzle 66.

[0042] As Figure 5 shown in the figure, the ultrasonic atomization sheet 51, the water injection port 53, and the liquid level sensor 54 are all arranged inside the atomization chamber 50. The ultrasonic atomization sheet 51 is installed at the bottom of the atomization chamber. The water injection port 53 is set on the lower side wall of the atomization chamber 50 as the input port of the atomization chamber 50. The liquid level sensor 54 is arranged at the upper part of the atomization chamber 50 and is used to monitor the liquid level in the atomization chamber 50. Specifically, the ultrasonic atomization sheet 51 is embedded in the detachable base 52, and the liquid level sensor 54 detects the water level of the deionized water entering from the water injection port 53 so that the water level is not higher than the ultrasonic atomization sheet 51.

[0043] As Figure 6As shown, the spiral guide vane 61 and the humidity sensor 63 are both arranged inside the mixing cavity 60. The spiral guide vane 61 is rotatably arranged inside the mixing cavity 60 along the axial direction of the mixing cavity 60, i.e., the gas flow direction. A number of heating bands 62 are sleeved on the outer side wall of the mixing cavity 60 at intervals in parallel. The humidity sensor 63 is arranged on the side wall of the mixing cavity 60. The humidity sensor 63 is electrically connected to the electric proportional valve 45 and the ultrasonic atomizing sheet 51 respectively. The flow rate of the electric proportional valve 45 is controlled according to the humidity sensor 63 and the atomizing amount of the ultrasonic atomizing sheet 51 is controlled according to the humidity sensor 63, so as to control the ratio of the output of the heating cavity 40 and the output of the atomizing chamber 50.

[0044] The base of the atomizing chamber 50 is specifically a detachable base 52, which is convenient for installing the ultrasonic atomizing sheet 51. The spiral guide vane 61 mixes the water mist generated by the atomizing chamber 50 and the heated air in the heating cavity 40 evenly. The heating band 62 controls the temperature of the mixed gas. The humidity sensor 63 detects the humidity of the mixed gas to meet the humidity requirement of human mouth exhalation. The pressure sensor 64 detects the pressure of the gas about to be ejected and feeds back and adjusts the micro air pump 44 to achieve the pressure intensity of human mouth exhalation. The gas temperature sensor 65 detects the temperature of the mixed gas again to ensure that the temperature is not affected by pipeline transportation. The nozzle 66 fits the shape of the magnetic tile 22 to better form water mist on the surface of the magnetic tile 22.

[0045] The environmental detection mechanism includes a transparent constant temperature box 30, a positioning sensor 23, a ventilation fan 31, a heating component 32, a box body temperature sensor 33 and a visual detection component 70. The positioning sensor 23, the ventilation fan 31, the heating component 32, the box body temperature sensor 33 and the visual detection component 70 are all arranged inside the transparent constant temperature box 30. The constant temperature box 30 is installed on the upper surface of the frame. A through opening for the conveyor belt 20 to pass through is provided at the lower part of the constant temperature box 30. The conveyor belt 20 passes through the constant temperature box 30 through the through opening. The constant temperature box 30 covers a section of the conveying area of the conveyor belt 20. The positioning sensor 23 and the visual detection component 70 are arranged in sequence along the conveyor belt 20, that is, the magnetic tile 22 first passes through the sensor and then through the visual detection component 70. The positioning sensor 23 is arranged on one side of the conveyor belt 20 inside the constant temperature box 30. The nozzle 66 of the humid and hot gas generating mechanism extends into the constant temperature box 30 and is arranged opposite to the conveyor belt 20 where the positioning sensor 23 is located, that is, the spraying position of the nozzle 66 is the same as the monitoring area of the positioning sensor 23 on the conveyor belt. A number of visual detection components 70 are arranged around the conveyor belt 20 and are respectively installed at positions around and above the conveyor belt 20 for taking multi-angle photos of the magnetic tile 22.

[0046] On the side wall of the constant temperature box body 30, there is a box body temperature sensor 33 for monitoring the temperature inside the constant temperature box body 30, a heating component 32, and several ventilation fans 31 for realizing the gas exchange between the inside and outside of the constant temperature box body 30. The box body temperature sensor 33 is electrically connected to the heating component 32 and several ventilation fans 31 respectively, and the positioning sensor 23 is electrically connected to the conveyor belt 20. When it is detected that the magnetic tile 22 passes by, the conveyor belt 20 is controlled to stop conveying, and after a predetermined time, the conveyor belt 20 starts to run again. The heating component 32 generates hot air to heat the air temperature inside the constant temperature box body 30, the ventilation fans 31 cool down the constant temperature box body 30, and the box body temperature sensor 33 detects whether the temperature inside the box is constant.

[0047] In this embodiment, sensors such as the hot air temperature sensor (43), humidity sensor (63), and gas temperature sensor (65) all adopt a probe structure, and the probe is inside the cavity or pipeline.

[0048] The vision detection component 70 includes a high-speed industrial camera 71, a distance adjustment part 72, a lifting part 73, and a camera support 74. The distance adjustment part 72, the lifting part 73, and the high-speed industrial camera 71 are installed on the camera support 74. The lifting part 73 and the distance adjustment part 72 are respectively used to adjust the height of the high-speed industrial camera 71 and the horizontal distance from the magnetic tile 22. The distance adjustment part 72 enables the front and rear cameras to adjust their positions, the lifting part 73 enables the upper camera and the left and right cameras on the conveyor belt to adjust their heights, and the camera support 74 fixes the distance adjustment part 72 and the front and rear cameras; in this embodiment, there are 5 vision detection components 70, which respectively photograph the four side surfaces and the upper surface of the magnetic tile 22. As Figure 3 shown, Figure 3 the vision detection components 70 in [reference] have different size differences, but the structures are the same.

[0049] The distance adjustment part 72 and the lifting part 73 are both installed on the camera support 74 in the form of a slide rail and a slider, and drive the camera to move. The slide rails of the front and rear cameras are installed on the inner top of the support, and the sliders connected to the slide rails move back and forth along the conveyor belt direction. The slide rails of the left and right cameras and the upper camera are vertically installed on the platform, and the sliders move up and down along the slide rails to adjust the camera shooting distance.

[0050] It further includes an image detection device, which is electrically connected to the high-speed industrial camera 71 and is used to receive the images taken by the high-speed industrial camera 71 and perform defect detection to obtain the magnetic tile defect area.

[0051] An opening structure is provided in the middle of the limiter 21, which is used to guide the magnetic tile 22 to be placed on the conveyor belt 20 below the opening and realize limit positioning.

[0052] A method for detecting internal cracks in magnetic tiles by simulating the generation of humid and hot air in the human lung includes the following steps:

[0053] S1. Turn on the micro air pump 44 to drive external gas to flow into the humid and hot gas generating mechanism. After the gas is heated and humidified by the heating component and the humidifying component in sequence, it is transported to the nozzle 66 for continuous spraying.

[0054] S2. The box body temperature sensor 33 in the environmental detection mechanism continuously detects the temperature. When the detected temperature is greater than the preset temperature, turn on the exhaust fan 31 to cool the gas in the constant temperature box body 30. When the detected temperature is less than the preset temperature, turn on the heating component 32 to heat the gas in the constant temperature box body 30 until the detected temperature in the constant temperature box body 30 is constant at the preset temperature.

[0055] S3. Place the magnetic tile 22 on the conveyor belt 20 at the groove of the limiter 21. The conveyor belt 20 drives the magnetic tile 22 to move into the constant temperature box body 30. When the positioning sensor 23 detects the magnetic tile 22, the conveyor belt 20 stops conveying. The nozzle 66 sprays the gas heated and humidified by the heating component and the humidifying component towards the magnetic tile 22. The gas heated and humidified by the heating component and the humidifying component forms water mist when it meets the cold magnetic tile 22 and adheres to the surface of the magnetic tile 22.

[0056] S4. Subsequently, the high-speed industrial camera 71 starts to shoot a video. The conveyor belt 20 starts, and the magnetic tile 22 continues to be driven by the conveyor belt 20 and passes through the shooting area of the high-speed industrial camera 71. After a predetermined time, the high-speed industrial camera 71 stops shooting the video, that is, the industrial camera 71 starts shooting when the magnetic tile 22 has not entered the field of view, and stops shooting when the magnetic tile 22 has completely left the field of view, and transmits the shot video to the image detection device to detect the defects of the magnetic tile 22 to obtain the defect area of the magnetic tile 22.

[0057] The present invention adopts a heating cavity to precisely heat compressed air through a spiral air duct and PTC layered heating technology; the atomization chamber uses an ultrasonic atomizer and a double-flow mixing chamber to generate a warm and humid air flow with a humidity of 90 - 95% RH, and through differential pressure - temperature difference collaborative adsorption, ensures that the water mist evenly covers the surface of the magnetic tile; the visual detection module uses a high-speed industrial camera to capture the dynamic of water mist volatilization.

[0058] By simulating the exhalation characteristics of the human body to form a controllable water film on the surface of the magnetic tile, and using the significant differences in the physical / chemical characteristics between the defect area and the normal area resulting in the significant differences in the water mist volatilization rate and form, combined with high-speed dynamic imaging and intelligent algorithms to achieve precise identification of defects.

[0059] Specifically, when the magnetic tile 22 is transported to the limiter 21 on the conveyor belt 20, the exhaust fan 31 and the heating component 32 in the constant temperature box body 30 continuously control the temperature of the constant temperature box body 30 under the feedback regulation of the box body temperature sensor 33 to ensure the stability of the box body temperature.

[0060] The micro air pump 44 transports air through a pipeline into the heating cavity 40 via an electric proportional valve 45. The air flows along the three-layer spiral fins 41 and is heated by the PTC heating sheet 42 array embedded in the spiral fins. The heating temperature is feedback-regulated by the hot air temperature sensor 43 near the outlet of the heating cavity 40. The outer layer of the heating cavity 40 is wrapped with heat-insulating cotton to further control the hot air temperature.

[0061] Deionized water in the atomization chamber 50 is injected through the water injection port 53. The water level of the deionized water is monitored by the liquid level sensor 54 at the top of the atomization chamber 50 to ensure that the water level in the water storage part is not higher than the ultrasonic atomization sheet 51, continuously generating water mist. The water mist laterally cuts into the mixing cavity 60 through a pipeline and mixes with the axially entering heated air. Under the action of the spiral guide fins 61, the mixing time is delayed, enabling the hot air and the water mist to be fully and evenly mixed. The heating belt 62 wrapped around the outer surface of the mixing cavity 60 keeps the cavity warm, and the humidity sensor 63 feedback-regulates the humidity of the mixed gas to meet the temperature and humidity requirements of human breath.

[0062] Near the gas nozzle 66 of the mixed gas, the pressure of the mixed gas is monitored by the pressure sensor 64 to enable it to evenly adhere to the surface of the magnetic tile 22. The gas temperature sensor 65 at the gas nozzle 66 further feedback-regulates the temperature of the mixed gas to ensure that the temperature and humidity of the mixed gas are not affected due to pipeline transportation or other reasons.

[0063] After the mixed gas is ready, the magnetic tile 22 in the limiter 21 is transported to the gas nozzle 66 through the conveyor belt 20. The positioning sensor 23 detects the magnetic tile 22 and feedback-regulates the conveyor belt motor to stop the conveyor belt 20, waiting for the mixed gas to form a uniform water mist on the surface of the magnetic tile 22. Subsequently, it is transported through the conveyor belt 20 to the detection area. A total of 5 high-speed industrial cameras 71 in the front, rear, left, right, and above directions take pictures of the dynamic evaporation of the water mist on the surface of the magnetic tile 22. Due to the difference in the evaporation speed of the water mist in the defective and non-defective areas, the magnetic tile 22 is subjected to defect detection, achieving the effect of simulating human breath to generate water mist on the surface of the magnetic tile 22 to detect whether there are defects such as cracks and pores on the surface of the magnetic tile 22. The present invention is not only applicable to the defect detection of magnetic tiles but also applicable to the detection of cracks, pores, and inclusions in the production process of magnetic materials such as ferrite and neodymium iron boron.

[0064] The innovation of the present invention lies in:

[0065] Different from the traditional method for detecting internal cracks in magnetic tiles, the present invention innovatively sprays hot and humid gas on the surface of the magnetic tile to form water mist, and detects the internal cracks in the magnetic tile by observing the water mist distribution. A new non-destructive testing method is adopted to detect defects such as internal cracks and pores in the magnetic tile, improving the efficiency of previous manual detection and being applicable to industrial quality inspection of magnetic materials.

[0066] An automated device is designed to capture the dynamic process of water mist volatilization through a vision detection module using a high-speed industrial camera, which is sensitive to the differences in surface volatilization characteristics. Moreover, the temperature and humidity characteristics of human exhalation are simulated through a humid and hot gas generating mechanism, and the detection consistency is good. It eliminates the need for employees to observe with the naked eye, improves the detection efficiency, provides a new method for non-destructively detecting the defects of the magnetic tile 22, achieves the function of facilitating detection, reduces the work intensity of the staff, and improves the detection accuracy at the same time.

[0067] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar methods and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung, which is used to spray humid and hot gas on the surface of the magnetic tile (22) to form water mist, and detect the internal crack defect of the magnetic tile (22) by observing the water mist distribution. It is characterized in that: It includes a frame, a humid and hot gas generating mechanism, an environmental detection mechanism, a stopper (21) and a conveyor belt (20). The humid and hot gas generating mechanism is located on the side of the frame, and one end of the humid and hot gas generating mechanism extends into the environmental detection mechanism. It is used to generate heated and humidified gas and then spray it on the surface of the magnetic tile (22) inside the environmental detection mechanism to form water mist. The conveyor belt (20) and the environmental detection mechanism are both installed on the upper surface of the frame. The conveyor belt (20) is used to place and convey the magnetic tile (22). A stopper (21) for restricting the placement position of the magnetic tile (22) is installed at the feeding end of the conveyor belt (20). The environmental detection mechanism is installed above the conveyor belt (20) and connected to the upper surface of the frame, covering a section of the conveying area of the conveyor belt (20), and is used to observe the water mist distribution and detect crack defects in the magnetic tile (22).

2. The magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung according to claim 1, wherein: The humid and hot gas generating mechanism includes a micro air pump (44), an electro - proportional valve (45), a heating component, a humidifying component, a pressure sensor (64), a gas temperature sensor (65) and a nozzle (66). The output port of the micro air pump (44) is connected to the input port of the heating component through a pipeline. An electro - proportional valve (45) for adjusting the gas flow is installed on the pipeline between the micro air pump (44) and the heating component. The output port of the heating component is connected to the input port of the humidifying component through a pipeline. The output port of the humidifying component is connected to the nozzle (66) through a pipeline extending into the environmental detection mechanism. A pressure sensor (64) and a gas temperature sensor (65) are arranged on the pipeline between the humidifying component and the nozzle (66). The pressure sensor (64) is electrically connected to the micro air pump (44), the gas temperature sensor (65) is electrically connected to the heating component, and the humidifying component and the electro - proportional valve (45) are electrically connected.

3. The magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung according to claim 1, characterized in that: The heating component includes a heating cavity (40), a three - layer spiral fin (41), a PTC heating sheet (42) and a hot air temperature sensor (43). The input port of the heating cavity (40) serves as the input port of the heating component and is connected to the output port of the micro air pump (44) through a pipeline. The electro - proportional valve (45) is installed on the pipeline between the heating cavity (40) and the micro air pump (44). The output port of the heating cavity (40) serves as the output port of the heating component and is connected to the humidifying component through a pipeline. Inside the heating cavity (40), there are a three - layer spiral fin (41), a PTC heating sheet (42) and a hot air temperature sensor (43). The three - layer spiral fin (41) is rotatably arranged along the axial direction of the heating cavity (40) inside the heating cavity (40) for guiding the gas to rotate and flow to adjust the gas flow rate. A number of PTC heating sheets (42) are attached to the surface of the three - layer spiral fin (41) for heating the gas flowing through the three - layer spiral fin (41). The hot air temperature sensor (43) is used to monitor the temperature inside the heating cavity (40). Both the gas temperature sensor (65) and the hot air temperature sensor (43) are electrically connected to the PTC heating sheet (42).

4. The magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung according to claim 1, wherein: The humidifying component includes an atomizing chamber (50), an ultrasonic atomizing sheet (51), a water injection port (53), a liquid level sensor (54), a mixing cavity (60), a spiral guide vane (61), a heating belt (62) and a humidity sensor (63). The input port of the mixing cavity (60) serves as the input port of the humidifying component and is respectively connected to the output port of the heating cavity (40) and the output port of the atomizing chamber (50). The output port of the mixing cavity (60) serves as the output port of the humidifying component and is connected to a spray nozzle (66) through a pipeline. A pressure sensor (64) and a gas temperature sensor (65) are arranged on the pipeline between the output port of the mixing cavity (60) and the spray nozzle (66). The ultrasonic atomizing sheet (51), the water injection port (53) and the liquid level sensor (54) are all arranged inside the cavity of the atomizing chamber (50). The ultrasonic atomizing sheet (51) is installed at the bottom of the atomizing chamber, the water injection port (53) is arranged on the lower side wall of the atomizing chamber (50), and the liquid level sensor (54) is used to monitor the liquid height in the atomizing chamber (50). The spiral guide vane (61) and the humidity sensor (63) are both arranged inside the cavity of the mixing cavity (60). The spiral guide vane (61) is rotatably arranged along the axis of the mixing cavity (60) inside the cavity of the mixing cavity (60). A plurality of heating belts (62) are sleeved on the outer side wall of the mixing cavity (60) at intervals in parallel. The humidity sensor (63) is arranged on the side wall of the mixing cavity (60), and the humidity sensor (63) is electrically connected to an electric proportional valve (45) and the ultrasonic atomizing sheet (51) respectively.

5. A magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung, characterized in that: The environment detection mechanism includes a constant temperature box (30), a positioning sensor (23), a ventilation fan (31), a heating component (32), a box body temperature sensor (33) and a visual detection component (70). The positioning sensor (23), the ventilation fan (31), the heating component (32), the box body temperature sensor (33) and the visual detection component (70) are all arranged inside the constant temperature box (30). The constant temperature box (30) is installed on the upper surface of the frame. There is a through opening at the lower part of the constant temperature box (30). A conveyor belt (20) passes through the constant temperature box (30) through the through opening. The constant temperature box (30) covers a section of the conveying area of the conveyor belt (20). The positioning sensor (23) and the visual detection component (70) are arranged in sequence along the conveyor belt (20). The positioning sensor (23) is arranged on one side of the conveyor belt (20) inside the constant temperature box (30). The spray nozzle (66) of the humid and hot gas generating mechanism extends into the constant temperature box (30) and is arranged opposite to the conveyor belt (20) where the positioning sensor (23) is located. A plurality of visual detection components (70) are arranged around the conveyor belt (20) and are used for taking multi-angle photos of the magnetic tile (22). On the side wall of the constant-temperature box body (30), there is a box body temperature sensor (33) for monitoring the temperature inside the constant-temperature box body (30), a heating component (32), and several ventilation fans (31) for realizing the gas exchange between the inside and outside of the constant-temperature box body (30). The box body temperature sensor (33) is electrically connected to the heating component (32) and the ventilation fans (31) respectively, and the positioning sensor (23) is electrically connected to the conveyor belt (20).

6. The magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung according to claim 4, wherein: The visual detection component (70) includes an industrial camera (71), a distance adjustment part (72), a lifting part (73), and a camera bracket (74). The distance adjustment part (72), the lifting part (73), and the industrial camera (71) are installed on the camera bracket (74). The lifting part (73) and the distance adjustment part (72) are respectively used to adjust the height of the industrial camera (71) and the horizontal distance from the magnetic tile (22).

7. A magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung, characterized in that: It further includes an image detection device, which is electrically connected to the industrial camera (71) and is used to receive the images taken by the industrial camera (71) and perform defect detection to obtain the defective area of the magnetic tile.

8. A magnetic tile internal crack defect detection device for simulating the generation of humid and hot air in a human lung according to claim 1, characterized in that: An opening structure is provided in the middle of the limiter (21) for guiding the magnetic tile (22) to be placed on the conveyor belt (20) below the opening and realizing the limitation of the magnetic tile (22).

9. A method for detecting internal crack defects in magnetic tiles for simulating the generation of humid and hot air in a human lung according to claim 1, characterized in that, It includes the following steps: S1. Turn on the micro air pump (44) to drive the gas to flow into the humid and hot gas generating mechanism. After the gas is heated and humidified by the heating component and the humidifying component in sequence, it is transported to the nozzle (66) for continuous spraying. S2. The box body temperature sensor (33) in the environmental detection mechanism performs temperature detection. When the detected temperature is greater than the preset temperature, turn on the ventilation fan (31) to cool the gas inside the constant-temperature box body (30). When the detected temperature is less than the preset temperature, turn on the heating component (32) to heat the gas inside the constant-temperature box body (30) until the detected temperature inside the constant-temperature box body (30) is constant at the preset temperature. S3. Place the magnetic tile (22) on the conveyor belt (20) at the groove of the limiter (21). The conveyor belt (20) drives the magnetic tile (22) to move into the constant-temperature box body (30). When the positioning sensor (23) detects the magnetic tile (22), the conveyor belt (20) stops conveying, and the nozzle (66) sprays the gas heated and humidified by the heating component and the humidifying component towards the magnetic tile (22), forming a water mist on the surface of the magnetic tile (22). S4. Subsequently, the industrial camera (71) starts shooting a video. The conveyor belt (20) starts, and the magnetic tile (22) continues to be driven by the conveyor belt (20) and passes through the shooting area of the industrial camera (71). After a predetermined time, the industrial camera (71) stops shooting the video and transmits the shot video to the image detection device to perform defect detection on the magnetic tile (22) to obtain the defective area of the magnetic tile (22).

Images