Egg body surface crack detection device and method

Abstract

The invention discloses an egg surface crack detection device and method, and the device comprises a conveying line which is used for conveying to-be-detected eggs; and the heating device is arranged beside the conveying line and is used for carrying out heating operation of only heating egg white and not heating egg shells on the egg bodies conveyed by the conveying line. The egg body surface crack detection device has the beneficial effects that the egg body surface crack detection device is suitable for an industrial vaccine production line, a heat source in an egg body is stable and is not influenced by an external environment and residues on the surface of an egg shell, the surface of the egg shell does not need to be cleaned, and time and labor are saved. The high-frequency electric field can quickly heat egg white to a target temperature, and the egg white is in direct contact with air, so that the heat loss rate (convection and radiation) at the crack of the eggshell is obviously higher than that of a complete eggshell (only conduction), so that a crack region presents high-temperature bright spots in the thermal infrared imager, the signal-to-noise ratio of the crack is high, the crack position is quickly and accurately identified, and the risks of missing detection and false detection are avoided.

Description

Technical Field

[0001] This application relates to the technical field of food detection, and particularly to an egg surface crack detection device and method. Background Art

[0002] Currently, the cultivation of certain vaccines (such as influenza, avian influenza, Newcastle disease vaccines) is carried out in chicken embryos (fertilized eggs in the process of hatching). The virus cultivation requires the egg body to be intact and the surface to be free of damage, otherwise external bacteria will invade the egg body and lead to the failure of virus cultivation. Although manual inspection of the egg surface quality has been carried out during the egg procurement process, the naked eye can only identify eggs with obvious surface damage. It is very difficult to see eggs with fine cracks on the surface with the naked eye. Therefore, the eggs still need to be re-inspected before injecting the virus to eliminate cracked eggs and ensure that the eggs for virus injection are intact.

[0003] Currently, the detection methods for egg surface cracks include manual visual inspection method, acoustic resonance analysis method, machine vision detection method, and laser scattering detection method. Among them, the manual visual inspection method is to observe the eggshell with the naked eye under strong light (transmitted light or LED backlight), and identify defects through abnormal light refraction or dark spots at the crack. This method has a slow recognition speed and low efficiency, and the fatigue of the human eye will lead to an increase in the misjudgment rate. Therefore, it has been gradually abandoned in recent years.

[0004] The acoustic resonance analysis method is to tap the eggshell to generate sound waves, and analyze the resonance frequency through a sensor. The frequency of a complete eggshell is stable (about 1.2 - 1.8 kHz), and cracks cause frequency disorders. The problem with this method is that it has high requirements for the detection environment, and the noise generated around the detection environment will seriously affect the detection quality, and the detection efficiency is not very high. Therefore, this method is mostly used in laboratory places and is not suitable for industrial vaccine production lines.

[0005] The laser scattering detection method scans the eggshell surface with a laser beam. The light at the crack undergoes irregular scattering, and the change in the scattering pattern is captured by a photoelectric sensor. The problem with this method is that it is extremely sensitive to vibration. Any vibration generated during the detection process on the production line will cause signal drift, seriously affecting the detection quality. Therefore, this method is also mostly used in laboratory places and is not suitable for industrial vaccine production lines.

[0006] Machine vision inspection method is the mainstream crack detection method applied in the current industrialized vaccine production line. By using high-resolution cameras (5 - 20MP) to take pictures of the eggshell surface from multiple angles, and analyzing the abnormal image texture through AI algorithms (such as CNN convolutional neural network), this method has a fast detection speed. In theory, when integrating a multi-camera system, the detection rate can reach 30,000 eggs per hour. However, it has certain requirements for the cleanliness of the eggshell surface. Residues such as feces or feathers on the eggshell surface are easily misjudged by AI as cracks, affecting the detection accuracy. And eggs cannot be washed with water, otherwise it will damage the cutin layer on the eggshell surface, making it easy for bacteria in the air to invade the interior of the egg through the eggshell pores, increasing the risk of internal egg contamination and affecting the quality of virus cultivation. Therefore, only dry cleaning can be carried out on the egg surface, and the cleaning effect is limited. In particular, stubborn residues on the eggshell surface are very difficult to clean thoroughly, and the cleaning work is time-consuming and laborious. Summary of the Invention

[0007] The main purpose of this application is to propose a crack detection device and method for the egg surface, aiming to solve the problem of false detection in the current crack detection method for the egg surface in the industrialized vaccine production line, which affects the detection accuracy.

[0008] To solve the above problems, this application proposes a crack detection device for the egg surface, including: A conveyor line for conveying the eggs to be detected; A heating device is arranged beside the conveyor line and is used to perform a heating operation on the eggs conveyed by the conveyor line, only heating the egg white without heating the eggshell. A thermal imaging detection device is arranged beside the conveyor line and is located downstream of the heating device in the conveying direction of the conveyor line. It is used to perform thermal imaging detection on the heated eggs conveyed by the conveyor line, and identify the cracks on the egg surface based on the different thermal images of the crack area and the non-crack area on the eggshell surface.

[0009] In one embodiment, the heating device is a microwave heating device or a radio frequency heating device.

[0010] In one embodiment, the radio frequency heating device includes a radio frequency heating box and several pairs of parallel plate electrodes. A radio frequency power supply, an impedance matching and control system are arranged in the radio frequency heating box. The impedance matching and control system is connected to the radio frequency power supply and several pairs of parallel plate electrodes, so as to form a high-frequency electric field between several pairs of parallel plate electrodes. When the conveyor line drives the eggs to pass through the high-frequency electric field, the egg white in the eggs is heated by the high-frequency electric field.

[0011] In one embodiment, the crack detection device for the egg surface further includes: A preheating device is arranged beside the conveyor line and is located upstream of the heating device in the conveying direction of the conveyor line. It is used to preheat the eggs conveyed by the conveyor line to prevent condensation on the egg surface.

[0012] In one embodiment, the heating device is a radio frequency heating device. The radio frequency heating device includes a radio frequency heating box, and an air cooling mechanism is arranged inside the radio frequency heating box for cooling the radio frequency power supply, impedance matching and control system inside the radio frequency heating box; An air outlet is arranged on the box wall of the radio frequency heating box, and the hot air inside the radio frequency heating box is blown out from the air outlet by the air cooling mechanism; The preheating device includes a box body penetrating along the conveying direction of the conveying line and a partition plate arranged inside the box body. The partition plate divides the inside of the box body into two parts, a diversion channel and an air collecting cavity. The egg body penetrates through the diversion channel driven by the conveying line, and the air collecting cavity is communicated with the diversion channel and the air outlet. The hot air blown out from the air outlet enters the diversion channel through the air collecting cavity, and the hot air flows in the diversion channel to preheat the egg body.

[0013] In one embodiment, the thermal imaging detection device includes: A plurality of infrared thermal imagers I, which are arranged around the egg body on the conveying line and are used for performing thermal imaging detection on the area of the egg body surface that does not face the conveying line; A rotating mechanism, which is arranged beside the conveying line and is located downstream of the infrared thermal imager I in the conveying direction of the conveying line, and is used for rotating the egg body so that the area of the egg body surface that originally faced the conveying line rotates to the area that does not face the conveying line; A plurality of infrared thermal imagers II, which are arranged around the egg body on the conveying line and are located downstream of the rotating mechanism in the conveying direction of the conveying line, and are used for performing thermal imaging detection on the area of the egg body surface that originally faced the conveying line after rotation; A processor, which is used for analyzing and processing the thermal images output by the infrared thermal imager I and the infrared thermal imager II, identifying whether there are cracks on the egg body surface, and the positions of the cracks when there are cracks.

[0014] In one embodiment, the conveying line is a belt conveyor. The belt conveyor has a conveyor belt and support rods. The support rods extend along the conveying direction of the conveyor belt. The support rods are fixed below the conveyor belt with egg bodies for supporting the conveyor belt to stably convey the egg bodies; A plurality of egg seats are arranged on the conveyor belt along the conveying direction. The egg seats are used for placing egg bodies. The egg seats include: A cylinder body, which penetrates through the conveyor belt and is rotatably connected with the conveyor belt. The upper and lower ends of the cylinder body are open and penetrated; A seat plate, which is fixedly connected to the upper end of the cylinder body. A stabilizing hole is arranged on the seat plate for stably placing the egg body; A belt ring, which is fixed to the lower end of the cylinder body and is coaxial with the cylinder body. The belt ring contacts the support rod, and the movement of the conveyor belt causes the belt ring to rub against the support rod, driving the belt ring to rotate self - rotatably.

[0015] In one embodiment, the rotation mechanism includes: A translation device, which is fixed below the conveyor belt with egg bodies. The translation direction of the translation device is parallel to the conveying direction of the conveyor belt; A lifting device, which is connected to the translation device and is driven by the translation device to translate; A wheel seat, which is connected to the lifting device and is driven by the lifting device to rise through the cylinder body and the stable hole. A plurality of rollers are rotatably installed at the upper end of the wheel seat. When the wheel seat rises through the stable hole, the plurality of rollers push the egg body to rise smoothly and separate from the seat plate; A driving mechanism, which is directly or indirectly fixedly connected to the wheel seat. The rollers are in transmission connection with the driving mechanism. After the plurality of rollers push the egg body to rise and separate from the seat plate, the driving mechanism drives the rollers to rotate self - to drive the egg body to rotate.

[0016] In addition, the present application also proposes a method for detecting cracks on the surface of an egg body, including: Conveying the egg body to be detected through a conveyor line; Setting a heating device beside the conveyor line to perform a heating operation on the egg body conveyed by the conveyor line, heating only the egg white without heating the eggshell; Setting a thermal imaging detection device beside the conveyor line to perform thermal imaging detection on the heated egg body conveyed by the conveyor line, and identifying the cracks on the surface of the egg body based on the different thermal images of the cracked area and the non - cracked area on the eggshell surface.

[0017] In one embodiment, the method for detecting cracks on the surface of the egg body further includes: Setting a pre - heating device beside the conveyor line to pre - heat the egg body conveyed by the conveyor line to prevent dew condensation on the surface of the egg body. The pre - heated egg body enters the heating device under the conveyance of the conveyor line.

[0018] Beneficial effects: The egg body surface crack detection device of the present application realizes infrared crack detection of internal heat sources in the egg body by heating the egg white without heating the eggshell. This method has good anti - interference performance and is applicable to industrial vaccine production lines. The internal heat source of the egg body is stable, not affected by external environments such as air flow fluctuations, noise, vibration and other factors, and not affected by residues on the eggshell surface, without the need to clean the eggshell surface, saving time and effort. The high - frequency electric field can quickly heat the egg white to the target temperature. At the crack of the eggshell, since the egg white is in direct contact with air, the heat loss rate (convection + radiation) is significantly higher than that of the intact eggshell (only conduction), resulting in a high - temperature bright spot in the infrared thermal imager for the cracked area. The crack signal - to - noise ratio is high, so as to quickly and accurately identify the crack position, without the risk of missed detection and false detection, with high detection accuracy, fast detection speed and high efficiency. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of a device for detecting cracks on the surface of an egg in the present application Figure 1; Figure 2 is Figure 1 the enlarged view of part A in; Figure 3 is Figure 1 the enlarged view of part B in; Figure 4 is Figure 1 the enlarged view of part C in; Figure 5 is the structural schematic diagram of an egg surface crack detection device of the present application Figure 2 ; Figure 6 is Figure 5 the enlarged view of part D in; Figure 7 is Figure 5 the enlarged view of part E in; Figure 8 is Figure 5 the enlarged view of part H in; Figure 9 is the structural schematic diagram of an egg surface crack detection device of the present application Figure 3 ; Figure 10 is Figure 9 the enlarged view of part F in; Figure 11 is the structural schematic diagram of the thermal imaging detection device of the present application; Figure 12 is Figure 11 the enlarged view of part G in; Figure 13 is the structural schematic diagram of the rotation mechanism of the present application Figure 1 ; Figure 14 is the structural schematic diagram of the rotation mechanism of the present application Figure 2 ; Figure 15 is the structural schematic diagram of the egg seat of the present application.

[0020] The description of the reference numerals is as follows: 1. Conveyor line; 11. First frame; 12. First axle; 13. First pulley; 14. Conveyor belt; 15. Support rod; 16. Rolling element; 17. Second frame; 2. Egg seat; 21. Cylinder; 22. Seat plate; 23. Stabilizing hole; 24. Ring; 3. Egg body; 4. Radio frequency heating box; 41. Parallel plate electrode; 42. Air outlet; 5. Preheating device; 51. Deflector; 52. Deflector plate; 53. Bending part; 54. Partition; 55. Baffle; 56. Air collecting cavity; 57. Air passage; 58. Deflection passage; 6. Thermal imaging detection device; 61. First mounting bracket; 62. First infrared thermal imager; 63. Second infrared thermal imager; 64. Second mounting bracket; 65. Translation device; 66. Jacking device; 67. Third mounting bracket; 68. Wheel seat; 69. Roller shaft; 610. Roller; 611. First transmission belt; 612. Second transmission belt; 613. Driving mechanism; 614. Second wheel shaft; 615. Third transmission belt; 616. Second belt pulley; 617. Fourth transmission belt. Detailed implementation manner

[0021] At present, the machine vision detection method is the main method for detecting cracks on the surface of industrial eggs. However, it requires the eggshell surface to be clean and free of sundries such as feces and feathers. Otherwise, these sundries are very likely to be misidentified as cracks, resulting in false detection and affecting the detection accuracy. Since eggs cannot be washed with water, dry cleaning without water is difficult to clean the eggshell surface thoroughly. Therefore, the machine vision detection method currently generally has the problem of inevitable false detection, which affects the detection accuracy.

[0022] To solve the problem of false detection and improve the detection accuracy of cracks on the egg surface, this application proposes a new method for detecting cracks on the egg surface and a device for implementing this method. Specifically, as Figure 1 shown, a device for detecting cracks on the egg surface in this application includes: a conveyor line 1, a heating device, and a thermal imaging detection device 6. The conveyor line 1 is used to convey the eggs 3 to be detected; the conveyor line 1 can be a belt conveyor, a chain conveyor, a plate conveyor, etc., which are commonly used in the product assembly lines of current factories and enterprises. The setting of the conveyor line 1 can realize the assembly line operation of detecting cracks on the egg surface, with fast detection speed and high efficiency, and is suitable for industrial product production lines.

[0023] Specifically, when the conveyor line 1 is a belt conveyor, as Figures 1 - 4 shown, it has a first frame 11, a first wheel shaft 12, a first belt pulley 13, and a conveyor belt 14. The first wheel shaft 12 is rotatably installed on the first frame 11. The first belt pulley 13 is coaxially and fixedly installed on the first wheel shaft 12. The conveyor belt 14 is tightly sleeved on the first belt pulley 13. The rotation of the first belt pulley 13 drives the conveyor belt 14 to move and convey the eggs 3. The number of conveyor belts 14 can be configured according to the production capacity design requirements.

[0024] In this embodiment, as Figure 1As shown, the heating device is arranged beside the conveyor line 1 and is used to perform a heating operation on the egg body 3 conveyed by the conveyor line 1, which only heats the egg white without heating the eggshell. When the inside of the egg body 3 is heated (such as the egg white temperature rising), local temperature anomalies will be formed at the crack due to the change in the heat conductivity. The heat is evenly conducted in the area without cracks on the surface of the egg body 3, and the surface temperature distribution is continuous. The heat of the egg white in the cracked area quickly leaks out through the crack, resulting in the temperature at the crack position being significantly higher than the surrounding area. The method of only heating the egg white without heating the eggshell has the advantage of a stable heat source inside the egg body 3. Compared with the method of heating the eggshell and detecting the infrared characteristics on the surface of the eggshell to identify cracks, the first advantage of the infrared crack detection of the heat source inside the egg body 3 in this application is that it is not affected by external environmental interferences, such as factors like air flow fluctuations, noise, and vibration. Even if there is air flow interference (such as people walking), the relative temperature difference between the cracked area and the non-cracked area remains stable, and the anti-interference performance is good; the second is that it is not affected by the residues on the eggshell surface. The egg white at the crack of the eggshell is directly in contact with the air, and the heat loss rate (convection + radiation) is significantly higher than that of the intact eggshell (only conduction), resulting in a high-temperature bright spot appearing in the infrared thermal imager in the cracked area. The high-temperature bright spot will not be blocked or covered by the residues on the eggshell surface. The infrared characteristics of the cracked area are obvious, and the crack signal-to-noise ratio is high, so the crack position can be quickly and accurately identified without the risk of missed detection and false detection, with high detection accuracy, fast detection speed, and high efficiency. The third is that the penetration is stronger. The heat of the egg white leaks out directly through the crack, and it is easier to identify deep cracks than surface heating. Correspondingly, there is no need to clean the surface of the eggshell, and the crack detection can be directly carried out, which is simple, convenient, time-saving, and labor-saving.

[0025] Specifically, the heating devices that can achieve only heating the egg white without heating the eggshell include a microwave heating device or a radio frequency heating device. The microwave heating device excites the dipole rotation of water molecules in the egg white through microwaves (such as 2.45 GHz), and the eggshell has no water and hardly absorbs heat. The radio frequency heating device generates heat by making the ions in the egg white oscillate through a high-frequency electric field (such as 10 - 50 MHz). Since the eggshell is non-conductive, it does not generate heat.

[0026] Because radio frequency heating has the advantages of a greater penetration depth, more uniform heating of the egg white, more precise temperature control, and not easily causing local overheating of the egg white compared with microwave heating, the radio frequency heating method is preferably used. Specifically, as Figure 1As shown in the figure, the radio frequency heating device of this embodiment includes a radio frequency heating box 4 and several pairs of parallel plate electrodes 41. At least a radio frequency power supply, an impedance matching and control system are arranged in the radio frequency heating box 4. The radio frequency power supply is used to generate high-frequency signals, for example, generated by a power oscillator or a power amplifier. The impedance matching and control system includes a matching network and a controller. The matching network connects the radio frequency power supply and the parallel plate electrodes 41. Besides forming a high-frequency electric field between several pairs of parallel plate electrodes 41, it also adjusts the impedance through an LC circuit (variable capacitor / inductor) to maximize power transmission and reduce reflection. The controller is used to control the heating current and power of the radio frequency heating device. During the process that the conveyor belt 1 drives the egg body 3 through the high-frequency electric field, the egg white in the egg body 3 is heated by the high-frequency electric field. The high-frequency electric field can quickly heat the egg white to the target temperature. The heating temperature can be set according to the actual situation on site, but it should be noted that it cannot exceed the egg white denaturation threshold (about 58°C), otherwise the egg white will denature.

[0027] As Figures 1 - 9 shown in the figure, the radio frequency heating device of this embodiment is configured with multiple pairs of parallel plate electrodes 41, which can simultaneously heat the egg bodies 3 on multiple conveyor belts 14, greatly improving the heating rate of the egg bodies 3 and the detection efficiency of egg surface cracks.

[0028] Furthermore, as Figure 5 、 Figures 7 - 10 shown in the figure, the belt conveyor also has a support rod 15. The support rod 15 is fixed below the conveyor belt 14 with the egg body 3, and is used to support the conveyor belt 14 to smoothly convey the egg body 3, avoiding problems such as the conveyor belt 14 swinging downward due to excessive pressure, causing the egg body 3 to be unstable and roll off the conveyor belt 14, or the conveyor belt 14 breaking due to excessive pressure, ensuring the smooth and safe conveyance of the egg body 3. Specifically, the support rod 15 being fixed below the conveyor belt 14 with the egg body 3 can be achieved by fixedly connecting the support rod 15 to the radio frequency heating box 4, or by setting up a second frame 17 to support and fix the support rod 15. Further, to reduce the frictional loss between the support rod 15 and the conveyor belt 14, a rolling body 16 is arranged between the support rod 15 and the conveyor belt 14. The rolling body 16 is connected to the support rod 15 in a rolling manner, and the rolling contact between the conveyor belt 14 and the support rod 15 is realized through the rolling body 16, which not only reduces the wear between the support rod 15 and the conveyor belt 14, but also reduces the conveying resistance of the support rod 15 to the conveyor belt 14.

[0029] Furthermore, as Figures 1 - 10 shown in the figure, several egg seats 2 are arranged along the conveying direction on the conveyor belt 14. The egg seats 2 are used to place the egg bodies 3 to facilitate the conveyance of the conveyor belt 14. As Figure 15 shown in the figure, the egg seat 2 includes: a cylinder body 21, a seat plate 22, a belt loop 24. As Figures 1 - 10As shown, the cylinder body 21 penetrates through the conveyor belt 14 and is rotatably connected to the conveyor belt 14. The upper and lower ends of the cylinder body 21 are open and communicated. Such a design facilitates the subsequent rotation mechanism to rise and push the egg body 3 to rotate. The seat plate 22 is fixedly connected to the upper end of the cylinder body 21. A stabilizing hole 23 is provided on the seat plate 22. The stabilizing hole 23 is used for the stable placement of the egg body 3. After the egg body 3 is placed on the stabilizing hole 23, the bottom of the egg body 3 is located within the stabilizing hole 23. The setting of the stabilizing hole 23 can prevent the egg body 3 from rolling on the seat plate 22. Further, the upper surface of the seat plate 22 is a concave surface, and the stabilizing hole 23 is located at the lowest point of the concave surface. Such a design can prevent the egg body 3 from rolling off the seat plate 22 and further ensure the safety of egg body 3 transportation. The belt loop 24 is fixed to the lower end of the cylinder body 21 and is coaxial with the cylinder body 21. The belt loop 24 contacts the support rod 15. The movement of the conveyor belt 14 causes the belt loop 24 to rub against the support rod 15, thereby driving the belt loop 24 to rotate on its own axis, and then driving the egg seat 2 and the egg body 3 to rotate. Such a design ensures that the egg white is evenly heated during the process of the egg body 3 passing through the high-frequency electric field, because uneven heating of the egg white will cause subsequent thermal image disorder and affect crack recognition and detection.

[0030] In this embodiment, it is possible to only make the belt loop 24 rub against the support rod 15 to drive the rotation of the egg body 3 during the process of the egg body 3 passing through the high-frequency electric field, and not make the belt loop 24 rub against the support rod 15 during the process when the egg body 3 does not pass through the high-frequency electric field. For example, by changing the dimension of the support rod 15 in the width direction of the conveyor belt 14, it can be realized whether the support rod 15 and the belt loop 24 need to be in contact. Of course, in other embodiments, it is also possible to keep the belt loop 24 in frictional contact with the support rod 15 throughout the movement of the conveyor belt 14. During the process of the conveyor belt 14 driving the egg body 3 to move, the egg body 3 rotates synchronously on its own axis. It's just that when the conveyor belt 14 drives the egg body 3 to move to the detection positions corresponding to the infrared thermal imager one 62 and the infrared thermal imager two 63, the long axis direction of the egg body 3 is parallel to the length direction of the conveyor belt 14, that is, as Figure 1 shown by the egg body 3 in

[0031] Further, the egg surface crack detection device further includes a preheating device 5, such as Figure 1As shown, the preheating device 5 is arranged beside the conveyor line 1 and upstream of the heating device in the conveying direction of the conveyor line 1, and is used to preheat the egg bodies 3 conveyed by the conveyor line 1 to prevent dew condensation on the surfaces of the egg bodies 3. Since the egg bodies 3 are usually stored for freshness preservation at a low temperature, when the low-temperature egg bodies 3 are placed on the conveyor line 1, if the conveyor line 1 is in a room-temperature environment, dew is likely to condense on the surfaces of the egg bodies 3, especially in summer. Subsequently, when the dew-condensed egg bodies 3 enter the high-frequency electric field, arc discharge is likely to occur due to the moisture on the eggshell surfaces. In addition, the moisture on the surfaces of the dew-condensed egg bodies 3 may enter the egg bodies 3 subsequently (for example, enter through the pores on the eggshell surface or enter the egg bodies 3 from the injection needle holes after injecting viruses into the egg bodies 3), increasing the risk of internal contamination of the egg bodies 3 and affecting the quality of virus cultivation. Moreover, most importantly, dew condensation will also affect infrared imaging. Therefore, it is very necessary to preheat the egg bodies 3 before heating to prevent dew condensation, unless the air humidity in the environment where the conveyor line 1 is located is reduced to a low and dry environment where dew is not likely to condense on the eggshells, then preheating can be omitted.

[0032] In this embodiment, when the heating device is a radio frequency heating device, the radio frequency heating device includes a radio frequency heating box 4, and an air-cooling mechanism is arranged in the radio frequency heating box 4 for cooling the radio frequency power supply, impedance matching and control system in the radio frequency heating box 4 to ensure the long-term and stable operation of the radio frequency heating box 4, such as Figure 6 As shown, an air outlet 42 is arranged on the box wall of the radio frequency heating box 4, and the hot air in the radio frequency heating box 4 is blown out from the air outlet 42 by the air-cooling mechanism; at this time, as Figure 1 、 Figure 5 、 Figure 8 As shown, the preheating device 5 includes a box body that is arranged through in the conveying direction of the conveyor line 1 and a partition 54 arranged in the box body. The box body includes a flow guide cover 51 and a flow guide plate 52 that is hermetically fixed below the flow guide cover 51. As Figure 8 As shown, the flow guide plate 52 and the flow guide cover 51 enclose a flow guide channel 58, and the egg bodies 3 penetrate through the flow guide channel 58 driven by the conveyor line 1. As Figure 5 and Figure 6 As shown, one end of the flow guide plate 52 close to the heating device is bent away from the flow guide cover 51 to form a bent portion 53. The partition 54 is located between the bent portion 53 and the flow guide cover 51 and is hermetically and fixedly connected to the flow guide cover 51. As Figure 1 As shown, baffles 55 are hermetically arranged on both sides of the partition 54 and the bent portion 53. The baffles 55, the bent portion 53, and the partition 54 jointly define an air collecting cavity 56. As Figure 5 and Figure 6As shown, the diversion channel 58 is located above the partition 54 and is open at both ends. The egg body 3 penetrates through the diversion channel 58 driven by the conveyor line 1. The air collection chamber 56 is located below the partition 54 and is communicated with the air outlet 42. The hot air blown out from the air outlet 42 enters the air collection chamber 56. One end of the partition 54 away from the heating device does not contact the diversion plate 52, so that an air passage 57 is defined between the partition 54 and the diversion plate 52, and the diversion channel 58 is communicated with the air collection chamber 56 through the air passage 57. The hot air blown out from the air outlet 42 enters the diversion channel 58 through the air collection chamber 56, and the hot air flows in the diversion channel 58 to preheat the egg body 3. With such a design, the hot air generated by the operation of the heating device is fully utilized as a heat source to preheat the egg body 3, eliminating the need to additionally provide heating elements in the preheating device 5 and saving energy consumption.

[0033] In this embodiment, as Figure 1 shown, the thermal imaging detection device 6 is arranged beside the conveyor line 1 and is located downstream of the heating device in the conveying direction of the conveyor line 1, and is used for performing thermal imaging detection on the heated egg body 3 conveyed by the conveyor line 1, and identifying the cracks on the surface of the egg body 3 based on the different thermal images of the cracked area and the non-cracked area on the eggshell surface. The conveying direction of the conveyor line 1 is as Figure 1 indicated by the arrow direction in Figure 3 shown. Specifically, as Figure 3 shown, the thermal imaging detection device 6 includes: a plurality of infrared thermal imagers I 62, a rotating mechanism, a plurality of infrared thermal imagers II 63, and a processor. The plurality of infrared thermal imagers I 62 are arranged around the egg body 3 on the conveyor line 1 and are used for performing thermal imaging detection on the area of the egg body 3 surface that does not face the conveyor line 1. For example, Figure 3 shown, the plurality of infrared thermal imagers I 62 and the plurality of infrared thermal imagers II 63 are both suspended and fixed on the mounting frame I 61, and the mounting frame I 61 is fixedly connected to the frame II 17. As Figure 3As shown, the area of the egg body 3 facing the conveyor line 1 on the surface of the egg body 3 is the lower surface of the egg body 3. Except for the lower surface, the other surfaces of the egg body 3 are the areas of the surface of the egg body 3 that do not face the conveyor line 1; the setting of multiple first infrared thermal imagers 62 ensures that all areas of the surface of the egg body 3 that do not face the conveyor line 1 are thermally imaged without omission. The rotating mechanism is arranged beside the conveyor line 1 and is located downstream of the first infrared thermal imagers 62 in the conveying direction of the conveyor line 1, and is used to rotate the egg body 3 so that the area of the surface of the egg body 3 that originally faced the conveyor line 1 rotates to an area that does not face the conveyor line 1, so that subsequently the second infrared thermal imagers 63 can perform thermal imaging detection on the area of the surface of the egg body 3 that originally faced the conveyor line 1, thereby completing the thermal imaging detection of all areas of the entire outer surface of the egg body 3; several second infrared thermal imagers 63 are arranged around the egg body 3 on the conveyor line 1 and are located downstream of the rotating mechanism in the conveying direction of the conveyor line 1, and are used to perform thermal imaging detection on the area of the surface of the rotated egg body 3 that originally faced the conveyor line 1; the processor is used to analyze and process the thermal images output by the first infrared thermal imagers 62 and the second infrared thermal imagers 63, and identify whether there are cracks on the surface of the egg body 3 and the position of the cracks when there are cracks.

[0034] When the conveyor line 1 is a belt conveyor, as Figure 3 , Figures 11 - 14 shown, the rotating mechanism includes: a translation device 65, a lifting device 66, a wheel seat 68, and a driving mechanism 613. Common translation devices 65 and lifting devices 66 are cylinders or hydraulic cylinders or linear motors, and common driving mechanisms 613 are motors or pneumatic / hydraulic motors. The translation device 65 is fixed below the conveyor belt 14 with the egg body 3, for example, the translation device 65 is installed and fixed through a second mounting frame 64, and the second mounting frame 64 is fixedly connected to the second frame 17. The translation direction of the translation device 65 is parallel to the conveying direction of the conveyor belt 14; the lifting device 66 is connected to the translation device 65, and the translation device 65 drives the lifting device 66 to translate; the translation direction is parallel to the conveying direction of the conveyor belt 14. The wheel seat 68 is connected to the lifting device 66, and the lifting device 66 drives the wheel seat 68 to rise through the cylinder body 21 and the stable hole 23. When there are multiple conveyor belts 14, a third mounting frame 67 can be set up, and the corresponding multiple wheel seats 68 are installed on the third mounting frame 67, and then the third mounting frame 67 is connected to the lifting device 66. With this design, a larger number of wheel seats 68 can be lifted with a smaller number of lifting devices 66 arranged. The upper end of the wheel seat 68 is rotatably installed with a number of roller wheels 610 through roller shafts 69, such as four, five, six roller wheels 610, etc. As long as when the wheel seat 68 rises through the stable hole 23, a number of roller wheels 610 can together push the egg body 3 to rise smoothly and separate from the seat plate 22. As Figures 13 - 14As shown, multiple rollers 69 are connected through a transmission belt 1 611, and the rollers 69 are connected to a driving mechanism 613 through a transmission belt 2 612. The driving mechanism 613 drives the rollers 69 to drive the rollers 610 to rotate. The driving mechanism 613 is directly or indirectly fixedly connected to the wheel seat 68, for example Figure 13 and Figure 14 The drive mechanism 613 is directly and fixedly connected to the mounting frame 3 67 . After the rollers 610 propel the egg 3 upward and away from the base plate 22 , the drive mechanism 613 drives the rollers 610 to rotate, causing the egg 3 to rotate, causing the area of the egg 3 surface that originally faced the conveyor line 1 to rotate to an area that does not face the conveyor line 1 . This allows the infrared thermal imager 2 63 to subsequently perform thermal imaging inspection of the area of the egg 3 surface that originally faced the conveyor line 1 , thereby completing thermal imaging inspection of the entire outer surface of the egg 3 .

[0035] When there are multiple wheel seats 68, in order not to cause the driving mechanism 613 to also be provided with multiple impact costs, such as Figure 13 and Figure 14 As shown, the same number of axles 2 614 as the number of wheel seats 68 can be installed on the mounting frame 3 67, and two pulleys 2 616 are installed on each axle 2 614. The two adjacent axles 2 614 are connected to each other through a transmission belt 3 615 tightly fitted on the pulley 2 616. Each axle 2 614 is further connected to the roller 69 on the wheel seat 68 corresponding to the axle 2 614 through a transmission belt 2 612. The driving mechanism 613 is connected to the pulley 2 616 on one of the axles 2 614 through a transmission belt 4 617. With this design, all the rollers 610 on all the wheel seats 68 can be driven to rotate by one or two driving mechanisms 613 with the help of pulley 2 616, transmission belt 3 615, and transmission belt 2 612.

[0036] In addition, this application also proposes a method for detecting cracks on the egg surface, comprising: The eggs 3 to be inspected are conveyed via a conveyor line 1, which may be a common assembly line used in industrial production, such as a belt conveyor, a chain conveyor, a plate conveyor, etc. A heating device is provided next to the conveyor line 1 to heat the egg whites but not the egg shells of the eggs 3 conveyed by the conveyor line 1. Specifically, the heating device is a microwave heating device or a radio frequency heating device, preferably a radio frequency heating device. A thermal imaging detection device 6 is set up next to the conveyor line 1 to perform thermal imaging detection on the heated eggs 3 conveyed by the conveyor line 1, and identify cracks on the surface of the egg 3 based on the difference in thermal images between the cracked area and the crack-free area on the eggshell surface.

[0037] Further, the method for detecting surface cracks of the egg body further includes: a preheating device 5 is arranged beside the conveyor line 1 to preheat the egg body 3 conveyed by the conveyor line 1 to prevent dew condensation on the surface of the egg body 3. The preheated egg body 3 enters the heating device under the conveyance of the conveyor line 1.

[0038] The method for detecting surface cracks of the egg body in this application realizes the infrared crack detection of the internal heat source in the egg body 3 by only heating the egg white and not heating the eggshell. When the inside of the egg body 3 is heated (such as the egg white temperature rising), local temperature anomalies will be formed at the crack positions due to the change in the heat conductivity. The heat is evenly conducted in the area without cracks on the surface of the egg body 3, and the surface temperature distribution is continuous. In the area with cracks, the heat of the egg white leaks out quickly through the cracks, resulting in the temperature at the crack position being significantly higher than the surrounding area. The method of only heating the egg white and not heating the eggshell has the advantage of a stable internal heat source in the egg body 3. Compared with the method of heating the eggshell and detecting the infrared characteristics on the eggshell surface to identify cracks, the first advantage of using the infrared crack detection of the internal heat source in the egg body in this application is that it is not affected by external environmental interferences, such as factors like air flow fluctuations, noise, and vibration. Even if there is air flow interference (such as people walking), the relative temperature difference between the crack and the non-crack area remains stable, and the anti-interference performance is good. The second advantage is that it is not affected by the residues on the eggshell surface. The egg white at the crack of the eggshell is directly in contact with the air, and the heat loss rate (convection + radiation) is significantly higher than that of the intact eggshell (only conduction), resulting in a high-temperature bright spot in the infrared thermal imager in the crack area. The high-temperature bright spot will not be blocked by the residues on the eggshell surface. The infrared characteristics of the crack area are obvious, and the crack signal-to-noise ratio is high, so the crack position can be quickly and accurately identified without the risk of missed detection and false detection, with high detection accuracy, fast detection speed, and high efficiency. The third advantage is that the penetration is stronger. The heat of the egg white leaks out directly through the cracks, making it easier to identify deep cracks than surface heating. Correspondingly, there is no need to clean the eggshell surface, and the crack detection can be directly carried out, which is simple, convenient, time-saving, and labor-saving.

[0039] The above are only the preferred embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made under the inventive concept of this application by using the content of the specification and drawings of this application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of this application.

Claims

1. An eggshell surface crack detection device, characterized in that, Comprising: A conveyor line for conveying egg bodies to be detected; A heating device disposed beside the conveyor line for performing a heating operation on the egg bodies conveyed by the conveyor line, heating only the egg whites and not the eggshells; A thermal imaging detection device disposed beside the conveyor line and downstream of the heating device in the conveying direction of the conveyor line for performing thermal imaging detection on the heated egg bodies conveyed by the conveyor line and identifying cracks on the surface of the egg bodies based on the different thermal images of the cracked area and the non-cracked area on the eggshell surface.

2. The egg body surface crack detection device according to claim 1, characterized in that, The heating device is a microwave heating device or a radio frequency heating device.

3. The egg body surface crack detection device according to claim 2, wherein The radio frequency heating device includes a radio frequency heating box and several pairs of parallel plate electrodes. A radio frequency power supply, an impedance matching and control system are provided in the radio frequency heating box. The impedance matching and control system is connected to the radio frequency power supply and several pairs of parallel plate electrodes, so as to form a high-frequency electric field between several pairs of parallel plate electrodes. During the process that the conveyor line drives the egg body to pass through the high-frequency electric field, the egg white in the egg body is heated by the high-frequency electric field.

4. The egg body surface crack detection device according to claim 1, wherein, The egg body surface crack detection device further includes: A preheating device disposed beside the conveyor line and upstream of the heating device in the conveying direction of the conveyor line for preheating the egg bodies conveyed by the conveyor line to prevent dew condensation on the surface of the egg bodies.

5. The egg body surface crack detection device according to claim 4, wherein, The heating device is a radio frequency heating device. The radio frequency heating device includes a radio frequency heating box, and an air cooling mechanism is provided in the radio frequency heating box for cooling the radio frequency power supply, the impedance matching and control system in the radio frequency heating box; An air outlet is provided on the box wall of the radio frequency heating box, and the hot air in the radio frequency heating box is blown out from the air outlet by the air cooling mechanism; The preheating device includes a box body penetrating along the conveying direction of the conveyor line and a partition plate disposed in the box body. The partition plate divides the inside of the box body into a diversion channel and an air collecting chamber. The egg body penetrates through the diversion channel driven by the conveyor line. The air collecting chamber is communicated with the diversion channel and the air outlet. The hot air blown out from the air outlet enters the diversion channel through the air collecting chamber, and the hot air flows in the diversion channel to preheat the egg body.

6. The egg surface crack detection device according to claim 1, characterized in that, The thermal imaging detection device includes: Several infrared thermal imagers I disposed around the egg body on the conveyor line for performing thermal imaging detection on the area of the egg body surface that does not face the conveyor line; A rotating mechanism disposed beside the conveyor line and downstream of the infrared thermal imagers I in the conveying direction of the conveyor line for rotating the egg body so that the area of the egg body surface that originally faced the conveyor line rotates to the area that does not face the conveyor line; Several infrared thermal imagers II disposed around the egg body on the conveyor line and downstream of the rotating mechanism in the conveying direction of the conveyor line for performing thermal imaging detection on the area of the rotated egg body surface that originally faced the conveyor line; A processor for analyzing and processing the thermal images output by the infrared thermal imagers I and the infrared thermal imagers II to identify whether there are cracks on the surface of the egg body and the positions of the cracks when there are cracks.

7. The egg body surface crack detection device according to claim 6, wherein The conveyor line is a belt conveyor. The belt conveyor has a conveyor belt and support rods. The support rods extend along the conveying direction of the conveyor belt. The support rods are fixed below the conveyor belt with egg bodies for supporting the conveyor belt to stably convey the egg bodies; A plurality of egg holders are arranged on the conveyor belt along the conveying direction, and the egg holders are used to place eggs. The egg holders include: The cylinder is arranged to pass through the conveyor belt and is connected to the conveyor belt in rotation. The upper and lower ends of the cylinder are open and connected; A base plate is fixedly connected to the upper end of the cylinder, and a stabilizing hole is provided on the base plate for stably placing the egg body; The belt ring is fixed at the lower end of the cylinder and is coaxial with the cylinder. The belt ring contacts the support rod. The movement of the conveyor belt causes the belt ring to rub against the support rod, driving the belt ring to rotate.

8. The egg surface crack detection device according to claim 7, characterized in that: The rotating mechanism comprises: A translation device is fixed below the conveyor belt with eggs, wherein the translation direction of the translation device is parallel to the conveying direction of the conveyor belt; The lifting device is connected to the translation device, and drives the lifting device to translate through the translation device; The wheel seat is connected to the lifting device, and the lifting device drives the wheel seat to rise and pass through the cylinder and the stabilizing hole. A plurality of rollers are rotatably mounted on the upper end of the wheel seat. When the wheel seat rises and passes through the stabilizing hole, the plurality of rollers push the egg body to rise steadily and separate from the base plate. The driving mechanism is directly or indirectly fixedly connected to the wheel seat, and the rollers are connected to the driving mechanism in a transmission manner. After the rollers push the egg body to rise and separate from the seat plate, the driving mechanism drives the rollers to rotate and drive the egg body to rotate.

9. A method for detecting cracks on the surface of an egg body, characterized in that, include: The eggs to be inspected are conveyed through a conveyor line; A heating device is provided next to the conveyor line to heat only the egg whites but not the egg shells of the eggs conveyed by the conveyor line; A thermal imaging detection device is set up next to the conveyor line to perform thermal imaging detection on the heated eggs transported by the conveyor line, and cracks on the egg surface are identified based on the difference in thermal images between the cracked area and the crack-free area on the eggshell surface.

10. The method for detecting surface cracks of an egg body according to claim 9, characterized in that, Also includes: A preheating device is set up next to the conveyor line to preheat the eggs conveyed by the conveyor line to prevent condensation on the surface of the eggs. The preheated eggs enter the heating device under the conveyor line.

Images