X-ray intelligent foreign matter detector

Abstract

The invention belongs to the technical field of food processing, and particularly relates to an X-ray intelligent foreign matter detection machine which comprises a detection box, an X-ray generator and an X-ray detector, and further comprises a feeding frame fixedly arranged on one side of the detection box, and a discharging opening is formed in one side of the top of the feeding frame; and the discharging frame is fixedly arranged on the other side of the detection box. The weight is accurately measured through the food weighing mechanism, so that the blowing dust removal strength is adjusted in a self-adaptive mode, the food packaging surface is effectively cleaned, and food is prevented from being damaged; meanwhile, the cooling mechanism monitors, regulates and controls the temperature in the detection box in real time, slows down aging of elements of the X-ray generator, reduces thermal noise of the detector and guarantees detection precision; moreover, the rotary detection mechanism is matched with rotary limiting to realize multi-angle detection, and foreign matter missing detection is prevented; in addition, the foreign matter marking mechanism and the alarm lamp can mark and prompt food with foreign matters in time, sorting treatment is facilitated, and the production efficiency and the product quality are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of food processing, and particularly relates to an X-ray intelligent foreign object detector. Background Art

[0002] In the modern food processing industry, food safety is of utmost importance. The X-ray intelligent foreign object detector has become a key device for ensuring product quality. By utilizing the penetration characteristics of X-rays, it can effectively detect foreign objects such as metals, stones, and glass mixed in packaged foods, ensuring the dietary safety of consumers.

[0003] However, such devices currently face many challenges in practical applications. In some food production workshops, such as high-temperature sterilization food production lines, the environmental temperature is often relatively high, causing the internal components of the X-ray generator to be in a high-temperature state for a long time. The aging speed will significantly accelerate, not only shortening the service life of the X-ray generator but also possibly leading to unstable X-ray intensity output, affecting the accuracy of foreign object detection. At the same time, the thermal noise inside the detector will increase significantly, interfering with the accurate reception and processing of X-ray signals by the detector, resulting in a decline in signal quality, and further reducing the sensitivity of the detector, seriously affecting production continuity and product quality control.

[0004] In addition, the surfaces of packaged foods often adhere to impurities such as dust and debris. These impurities will interfere with the penetration and reflection of X-rays. When X-rays irradiate the food packaging with adhered impurities, the impurities will absorb or scatter part of the X-rays, resulting in deviation of the signals received by the detector, thereby affecting the clarity and accuracy of the image, reducing the reliability and detection efficiency of the detector.

[0005] Therefore, an X-ray intelligent foreign object detector is proposed. Summary of the Invention

[0006] The purpose of the present invention is to address the above problems and provide an X-ray intelligent foreign object detector.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An X-ray intelligent foreign object detector includes a detection box, an X-ray generator, and an X-ray detector, and further includes:

[0008] A feeding rack, fixedly arranged on one side of the detection box, and a material discharging opening is provided on one side of the top of the feeding rack;

[0009] A discharging rack, fixedly arranged on the other side of the detection box, and a same serrated conveyor belt is provided inside the detection box, inside the feeding rack, and inside the discharging rack;

[0010] A food weighing mechanism, arranged inside the feeding rack and located below the material discharging opening;

[0011] A pusher mechanism is arranged on the inner side wall of the feeding rack, and the pusher mechanism is located on one side of the food weighing mechanism;

[0012] A blowing and dust-removing mechanism is arranged on the feeding rack and extends to both sides of the serrated conveyor belt;

[0013] A cooling mechanism is arranged on the side wall of the detection box, and a cooling pipe extending into the detection box is fixedly arranged on the side wall of the cooling mechanism. The cooling mechanism is connected to the blowing and dust-removing mechanism, and a temperature sensor is fixedly arranged on the inner side wall of the detection box;

[0014] A rotating detection mechanism is arranged inside the detection box, and both the X-ray generator and the X-ray detector are arranged on the rotating detection mechanism;

[0015] A foreign object marking mechanism is arranged inside the detection box, and the foreign object marking mechanism is located on one side of the rotating detection mechanism;

[0016] A PLC controller is fixedly arranged on the top of the detection box, and an alarm lamp is arranged on the top of the PLC controller. The serrated conveyor belt, the food weighing mechanism, the pusher mechanism, the blowing and dust-removing mechanism, the cooling mechanism, the rotating detection mechanism and the foreign object marking mechanism are all electrically connected to the PLC controller.

[0017] Preferably, the food weighing mechanism includes a housing fixedly arranged on the inner bottom wall of the feeding rack. An arc-shaped aluminum alloy elastic body is fixedly arranged inside the housing. An arc-shaped resistance strain gauge is arranged on the lower surface of the arc-shaped aluminum alloy elastic body. A downward pressure rod extending outward is arranged on the upper surface of the arc-shaped aluminum alloy elastic body. A weighing platform is fixedly arranged at the upper end of the downward pressure rod. A plurality of evenly distributed conveying rollers are rotatably arranged on the upper surface of the weighing platform.

[0018] Preferably, the pusher mechanism includes a pusher cylinder fixedly arranged on the inner wall of the feeding rack, and a pusher block is fixedly arranged at the moving end of the pusher cylinder.

[0019] Preferably, the blowing and dust-removing mechanism includes an air compressor fixedly arranged on the top of the feeding rack. An air inlet pipe is fixedly arranged at the air outlet end of the air compressor, and a gas flow regulating valve is fixedly arranged on the pipe wall of the air inlet pipe. A blowing plate is fixedly arranged on one side of the inner wall of the feeding rack, and the top of the blowing plate is fixedly connected to one end of the air inlet pipe. An exhaust fan is fixedly arranged on the other side of the inner wall of the feeding rack, and an air return pipe extending outward is fixedly arranged at the top of the exhaust fan.

[0020] Preferably, the temperature reduction mechanism includes a box body fixedly arranged on the side wall of the detection box. A partition is fixedly arranged inside the box body. A filter screen is fixedly arranged below the partition inside the box body. An exhaust pipe is fixedly arranged on the side wall of the box body and below the partition. A normally open solenoid valve is arranged on the pipe wall of the exhaust pipe. A guide pipe is fixedly arranged in the middle of the partition. A normally closed solenoid valve is fixedly arranged on the pipe wall of the guide pipe. A refrigeration pipe is fixedly arranged above the partition inside the box body. One end of the cooling pipe is fixedly connected to the side wall of the box body. One end of the return air pipe is fixedly connected to the side wall of the box body.

[0021] Preferably, the rotation detection mechanism includes an annular fixed plate fixedly arranged on the inner wall of the detection box. The toothed conveyor belt passes through the inside of the annular fixed plate. A rotating pipe is rotatably arranged on the inner wall at one end of the annular fixed plate. The X-ray generator and the X-ray detector are respectively fixedly arranged on the inner wall of the top and the inner wall of the bottom of the rotating pipe. A toothed ring is fixedly arranged on one side of the rotating pipe. A gear is meshed with the top of the toothed ring. A motor is fixedly arranged on the side wall of the detection box. The output end of the motor is fixedly provided with a rotating shaft extending into the detection box. One end of the rotating shaft is fixedly connected with the gear. A rotation limiting mechanism is arranged on the side of the rotating pipe away from the toothed ring.

[0022] Preferably, the rotation limiting mechanism includes a general light source fixedly arranged on the inner wall of the top of the annular fixed plate. A support is fixedly arranged on the inner wall of the top of the annular fixed plate. A general light detector corresponding to the position of the general light source is fixedly arranged on the horizontal part of the support. A light shielding ring is fixedly arranged on the side of the rotating pipe away from the toothed ring. A plurality of light transmission holes are arranged on the side wall of the light shielding ring.

[0023] Preferably, the foreign object marking mechanism includes a support plate fixedly arranged on the inner wall of the detection box. A liquid storage bin is fixedly arranged on the upper surface of the support plate. A colored marking liquid is stored inside the liquid storage bin. A liquid extraction pump is fixedly arranged on the inner wall of the bottom of the liquid storage bin. The output end of the liquid extraction pump is fixedly provided with a liquid supply pipe extending outside the liquid storage bin. The end of the liquid supply pipe is fixedly provided with a marking nozzle.

[0024] Compared with the existing technology, the beneficial effects of the present invention are as follows:

[0025] 1. Through the provided food weighing mechanism, pushing mechanism, and blowing and dust-removing mechanism, the food weighing mechanism can accurately measure the weight of packaged food. At the same time, based on the weighing result, the system can adaptively adjust the blowing intensity of the blowing and dust-removing mechanism. For lighter packaged food, a weaker blowing intensity is used to avoid displacement, tumbling, or even damage. For heavier packaged food, the blowing intensity is increased to effectively remove impurities such as surface dust and debris, avoiding interference with subsequent detections. After weighing, the packaged food is then pushed onto the surface of the serrated conveyor belt by the pushing mechanism, enabling the packaged food to pass through the blowing and dust-removing mechanism and enter the interior of the detection box.

[0026] 2. Through the provided temperature sensor, the temperature sensor can continuously monitor the internal temperature of the detection box. When the temperature is too high, the cooling mechanism is automatically activated. The cooling mechanism cools the gas entering the detection box, keeping the internal temperature of the detection box stably at around 25°C. This effectively slows down the aging rate of the internal components of the X-ray generator, reduces the thermal noise inside the detector, ensures the stability of the X-ray intensity output by the X-ray generator, improves the detector's ability to receive and process X-ray signals, and thus enhances the accuracy of foreign object detection, guaranteeing the continuity of production and product quality control.

[0027] 3. Through the provided rotation detection mechanism, the rotation detection mechanism can drive the X-ray generator and X-ray detector to rotate, changing the detection angle so that the X-ray beam can penetrate the packaged food from multiple angles. In cooperation with the rotation limit mechanism, stable detection at multiple angles is achieved, effectively avoiding the situation of missing foreign objects due to inappropriate detection angles, significantly improving the detection accuracy, and ensuring that foreign objects inside the packaged food can be comprehensively and accurately detected.

[0028] 4. Through the provided foreign object marking mechanism, when a foreign object is detected inside the packaged food, the foreign object marking mechanism is immediately activated. Colorful marking liquid is sprayed on the surface of the packaged food to clearly mark the products with foreign objects. At the same time, the alarm light lights up to remind the staff, facilitating the staff to quickly identify and sort out the unqualified products for rework processing, improving the processing efficiency of unqualified products during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of an X-ray intelligent foreign object detector provided by the present invention;

[0030] Figure 2 is a schematic sectional structure view of an X-ray intelligent foreign object detector provided by the present invention;

[0031] Figure 3 is a schematic structure view of the food weighing mechanism of an X-ray intelligent foreign object detector provided by the present invention;

[0032] Figure 4It is a schematic side view of the top of the feeding rack of an X-ray intelligent foreign object detector provided by the present invention;

[0033] Figure 5 It is a schematic structural view of a cooling mechanism of an X-ray intelligent foreign object detector provided by the present invention;

[0034] Figure 6 It is a schematic structural view of a rotating detection mechanism of an X-ray intelligent foreign object detector provided by the present invention;

[0035] Figure 7 It is a three-dimensional view of a light shielding ring of an X-ray intelligent foreign object detector provided by the present invention;

[0036] Figure 8 It is a schematic structural view of a foreign object marking mechanism of an X-ray intelligent foreign object detector provided by the present invention.

[0037] In the figure: 1 detection box, 2 X-ray generator, 3 X-ray detector, 4 feeding rack, 5 discharging opening, 6 discharging rack, 7 serrated conveyor belt, 8 food weighing mechanism, 81 housing, 82 arc-shaped aluminum alloy elastic body, 83 arc-shaped resistance strain gauge, 84 pressing rod, 85 weighing platform, 86 conveying roller, 9 pushing mechanism, 91 pushing cylinder, 92 pushing block, 10 air blowing and dust removal mechanism, 101 air compressor, 102 air inlet pipe, 103 gas flow regulating valve, 104 air blowing plate, 105 suction fan, 106 return air pipe, 11 cooling mechanism, 111 box body, 112 partition board, 113 filter screen, 114 exhaust pipe, 115 normally open solenoid valve, 116 air guide pipe, 117 normally closed solenoid valve, 118 refrigeration pipe, 12 cooling pipe, 13 temperature sensor, 14 rotating detection mechanism, 141 annular fixing plate, 142 rotating pipe, 143 gear ring, 144 gear, 145 motor, 146 rotating shaft, 15 foreign object marking mechanism, 151 support plate, 152 liquid storage bin, 153 liquid pumping pump, 154 liquid supply pipe, 155 marking nozzle, 16 PLC controller, 17 alarm lamp, 18 rotation limiting mechanism, 181 general light source, 182 support, 183 general light detector, 184 light shielding ring, 185 light transmission hole. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0039] As Figures 1-8 shown, an X-ray intelligent foreign object detector includes a detection box 1, an X-ray generator 2 and an X-ray detector 3, and further includes:

[0040] A feeding rack 4, fixedly arranged on one side of the detection box 1, and a discharging opening 5 is arranged on one side of the top of the feeding rack 4;

[0041] The discharging rack 6 is fixedly arranged on the other side of the detection box 1. Inside the detection box 1, inside the feeding rack 4, and inside the discharging rack 6, there is the same serrated conveyor belt 7. Since there are a plurality of serrated grooves on the surface of the serrated conveyor belt 7, after the packaged food is placed, the lower surface of the packaged food will also be exposed;

[0042] The food weighing mechanism 8 is arranged inside the feeding rack 4 and is located below the material discharging opening 5. The food weighing mechanism 8 includes a housing 81 fixedly arranged on the inner wall of the bottom of the feeding rack 4. Inside the housing 81, there is fixedly arranged an arc-shaped aluminum alloy elastic body 82. On the lower surface of the arc-shaped aluminum alloy elastic body 82, there is an arc-shaped resistance strain gauge 83 arranged. On the upper surface of the arc-shaped aluminum alloy elastic body 82, there is a downward pressure rod 84 extending outward. At the upper end of the downward pressure rod 84, there is fixedly arranged a weighing platform 85. On the upper surface of the weighing platform 85, there are a plurality of evenly distributed conveying rollers 86 rotatably arranged. The conveying rollers 86 can reduce the frictional resistance of the packaged food moving on the surface of the weighing platform 85, making it easy to push the packaged food. When the packaged food can be placed on the surface of the weighing platform 85, the weighing platform 85 and the downward pressure rod 84 are pressed downward by gravity and move downward. The downward pressure rod 84 will simultaneously press the bottom of the arc-shaped aluminum alloy elastic body 82 and the arc-shaped resistance strain gauge 83 and reduce the bending degree, making the self-resistance value of the arc-shaped resistance strain gauge 83 decrease.

[0043] The material pushing mechanism 9 is arranged on the inner side wall of the feeding rack 4 and is located on one side of the food weighing mechanism 8. The material pushing mechanism 9 includes a material pushing cylinder 91 fixedly arranged on the inner wall of the feeding rack 4. At the moving end of the material pushing cylinder 91, there is fixedly arranged a material pushing block 92. When the material pushing cylinder 91 extends, it drives the material pushing block 92 to move, and the material pushing block 92 can push the packaged food on the surface of the weighing platform 85.

[0044] The air blowing and dust removing mechanism 10 is arranged on the feeding rack 4 and extends to both sides of the serrated conveyor belt 7. The air blowing and dust removing mechanism 10 includes an air compressor 101 fixedly arranged on the top of the feeding rack 4. At the air outlet end of the air compressor 101, there is fixedly arranged an air inlet pipe 102, and on the pipe wall of the air inlet pipe 102, there is fixedly arranged a gas flow regulating valve 103. On one side of the inner wall of the feeding rack 4, there is fixedly arranged an air blowing plate 104, and the top of the air blowing plate 104 is fixedly connected to one end of the air inlet pipe 102. On the other side of the inner wall of the feeding rack 4, there is fixedly arranged an air suction fan 105. At the top of the air suction fan 105, there is an air return pipe 106 extending outward. The air compressor 101 can discharge high-pressure gas into the inside of the air inlet pipe 102, and then blow it to one side of the serrated conveyor belt 7 through the air blowing plate 104 to perform air blowing and dust removing treatment on the surface of the packaged food. At the same time, the air suction fan 105 can suck the dust gas into the inside of the air return pipe 106 for recycling treatment.

[0045] The cooling mechanism 11 is disposed on the side wall of the detection box 1, and a cooling pipe 12 extending into the interior of the detection box 1 is fixedly provided on the side wall of the cooling mechanism 11. The cooling mechanism 11 is connected to the air blowing and dust removal mechanism 10. A temperature sensor 13 is fixedly provided on the inner side wall of the detection box 1. The cooling mechanism 11 includes a box body 111 fixedly arranged on the side wall of the detection box 1. A partition 112 is fixedly provided inside the box body 111. A filter screen 113 is fixedly provided inside the box body 111 and below the partition 112. An exhaust pipe 114 is fixedly provided on the side wall of the box body 111 and below the partition 112, and a normally open solenoid valve 115 is provided on the pipe wall of the exhaust pipe 114. A guide pipe 116 is fixedly provided in the middle of the partition 112, and a normally closed solenoid valve 117 is fixedly provided on the pipe wall of the guide pipe 116. A refrigeration pipe 118 is fixedly provided inside the box body 111 and above the partition 112. One end of the cooling pipe 12 is fixedly connected to the side wall of the box body 111. One end of the return air pipe 106 is fixedly connected to the side wall of the box body 111. The suction fan 105 can suck the dust gas into the interior of the return air pipe 106, so that the gas is processed by the filter screen 113 and then discharged outward through the exhaust pipe 114, avoiding the phenomenon of pollution caused by impurity gases such as dust and debris. When it is necessary to discharge the filtered gas into the interior of the detection box 1, control the normally open solenoid valve 115 to close, and at the same time control the normally closed solenoid valve 117 to open, so that the filtered gas enters the position of the refrigeration pipe 118 through the guide pipe 116, is cooled by the refrigeration pipe 118 and then discharged into the cooling pipe 12, and finally discharged into the interior of the detection box 1 for cooling treatment. The filtered gas has no impurities and will not cause detection interference when discharged into the interior of the detection box 1.

[0046] The rotation detection mechanism 14 is arranged inside the detection box 1. Both the X-ray generator 2 and the X-ray detector 3 are arranged on the rotation detection mechanism 14. The rotation detection mechanism 14 includes an annular fixed plate 141 fixedly arranged on the inner wall of the detection box 1. The serrated conveyor belt 7 is arranged through the inside of the annular fixed plate 141. One end inner wall of the annular fixed plate 141 is rotatably provided with a rotating tube 142. The X-ray generator 2 and the X-ray detector 3 are respectively fixedly arranged on the top inner wall and the bottom inner wall of the rotating tube 142. One side of the rotating tube 142 is fixedly provided with a gear ring 143, and a gear 144 is meshed with the top of the gear ring 143. A motor 145 is fixedly arranged on the side wall of the detection box 1. The output end of the motor 145 is fixedly provided with a rotating shaft 146 extending into the inside of the detection box 1, and one end of the rotating shaft 146 is fixedly connected with the gear 144. When the motor 145 works, it can drive the rotating shaft 146 to rotate. The rotating shaft 146 can drive the gear 144 to rotate. The gear 144 drives the rotating tube 142, the X-ray generator 2 and the X-ray detector 3 to rotate inside the annular support plate 151, so as to change the detection angle of the X-ray generator 2 and the X-ray detector 3 for the packaged food. A rotation limiting mechanism 18 is arranged on one side of the rotating tube 142 away from the gear ring 143. The rotation limiting mechanism 18 includes a general light source 181 fixedly arranged on the top inner wall of the annular fixed plate 141. A support 182 is fixedly arranged on the top inner wall of the annular fixed plate 141. A general light detector 183 corresponding to the position of the general light source 181 is fixedly arranged on the horizontal part of the support 182. A light shielding ring 184 is fixedly arranged on one side of the rotating tube 142 away from the gear ring 143, and a plurality of light transmission holes 185 are formed on the side wall of the light shielding ring 184. The general light source 181 irradiates the general light detector 183 through the light transmission holes 185. The general light detector 183 will feedback an electrical signal to the PLC controller 16, so that the PLC controller 16 stops the operation of the motor 145.

[0047] The foreign object marking mechanism 15 is arranged inside the detection box 1, and the foreign object marking mechanism 15 is located on one side of the rotation detection mechanism 14. The foreign object marking mechanism 15 includes a support plate 151 fixedly arranged on the inner wall of the detection box 1. A liquid storage bin 152 is fixedly arranged on the upper surface of the support plate 151. Colorful marking liquid is stored inside the liquid storage bin 152. A liquid pumping pump 153 is fixedly arranged on the bottom inner wall of the liquid storage bin 152. The output end of the liquid pumping pump 153 is fixedly provided with a liquid supply pipe 154 extending outside the liquid storage bin 152, and the end of the liquid supply pipe 154 is fixedly provided with a marking nozzle 155. When the liquid pumping pump 153 works, it pumps the colorful marking liquid inside the liquid storage bin 152 into the liquid supply pipe 154, and then sprays it on the surface of the packaged food through the marking nozzle 155 to mark that there is a foreign object inside the packaged food at this position.

[0048] The PLC controller 16 is fixedly arranged on the top of the detection box 1, and an alarm lamp 17 is arranged on the top of the PLC controller 16. The serrated conveyor belt 7, the food weighing mechanism 8, the pushing mechanism 9, the air blowing and dust removing mechanism 10, the cooling mechanism 11, the rotating detection mechanism 14 and the foreign object marking mechanism 15 are all electrically connected to the PLC controller 16.

[0049] Now, the operation principle of the present invention is described as follows: The staff moves the packaging production conveyor line of the packaged food into the internal of the feeding port 5, so that the packaged food can be placed on the surface of the weighing platform 85 [the packaged foods are placed at equal intervals on the conveyor line, not continuously, so that the packaged foods fall intermittently onto the weighing platform 85], causing the weighing platform 85 and the pressing rod 84 to be pressed down by gravity and move downward. The pressing rod 84 will simultaneously press down the bottoms of the arc-shaped aluminum alloy elastic body 82 and the arc-shaped resistance strain gauge 83 and reduce the bending degree, causing the self-resistance value of the arc-shaped resistance strain gauge 83 to decrease [the arc-shaped resistance strain gauge 83 is a silicon semiconductor strain gauge. When subjected to tensile strain, the arrangement of its internal atoms changes, the energy band structure changes, resulting in a decrease in the carrier mobility and an increase in resistance. When the strain decreases, the atomic arrangement resumes, the carrier mobility increases, and the resistance decreases]. The PLC controller 16 can judge the weight of the packaged food according to the decrease in the resistance value [the internal of the PLC controller 16 is equipped with a resistance measurement circuit, which can directly measure the resistance value of the circuit connected to the arc-shaped resistance strain gauge 83. The greater the degree of decrease in the resistance value, the heavier the packaged food. Then the signal is amplified and processed several times and transmitted to the PLC controller 16 to realize the monitoring of the resistance value change of the arc-shaped resistance strain gauge 83]. During the weighing process of the packaged food, the PLC controller 16 will control the air compressor 101 and the suction fan 105 to work. The air compressor 101 can discharge high-pressure gas into the internal of the air inlet pipe 102, and then blow it to one side of the serrated conveyor belt 7 through the air blowing plate 104 for surface air blowing and dust removing treatment after the packaged food is weighed. The suction fan 105 can suck the dust gas into the internal of the return air pipe 106 [since the weights of different packaged foods are different, the required air blowing intensity is different, the deformation degree of the arc-shaped resistance strain gauge 83 is different, and the degree of decrease in its self-resistance value is also different. As the degree of decrease in the self-resistance value of the arc-shaped resistance strain gauge 83 gradually increases, the current of the gas flow regulating valve 103 connected to the arc-shaped resistance strain gauge 83 in the same circuit gradually increases, resulting in a gradually larger opening degree of the valve core of the gas flow regulating valve 103, so that the intensity of the gas blown by the air blowing plate 104 gradually increases, and thus the air blowing intensity can be adaptively adjusted according to different weights of the packaged foods, avoiding the phenomenon that a larger air blowing intensity causes displacement and rolling of the lighter packaged foods, affecting the accuracy of subsequent detection, and even possibly damaging the packaged foods].

[0050] After the weighing of the packaged food is completed, the PLC controller 16 will immediately activate the pusher cylinder 91 and the serrated conveyor belt 7. When the pusher cylinder 91 extends, it drives the pusher block 92 to move. The pusher block 92 can push the packaged food on the surface of the weighing platform 85 and let it fall onto one end surface of the serrated conveyor belt 7. When the serrated conveyor belt 7 operates, it conveys the packaged food towards the air-blowing dust removal mechanism 10. When the packaged food passes through the position of the air-blowing plate 104, high-pressure gas can blow up impurities such as dust and debris on the surface of the packaged food, improving the accuracy of detection [dust, debris and other impurities will absorb or scatter part of the X-ray, resulting in a deviation in the signal received by the X-ray detector 3]. Then, it is sucked into the interior of the return air pipe 106 by the suction fan 105 and discharged into the interior of the box body 111 through the return air pipe 106, enabling the gas to be processed by the filter net 113 and then discharged outward through the exhaust pipe 114, avoiding the phenomenon of pollution caused by impurity gases such as dust and debris;

[0051] During the weighing process of the packaged food, the temperature sensor 13 can continuously monitor the temperature inside the detection box 1. If the temperature inside the detection box 1 is too high, the temperature sensor 13 will feedback an electrical signal to the PLC controller 16 [the temperature sensor 13 is a thermal resistance temperature sensor, and the temperature sensor 13 is connected to the measurement circuit. The temperature change causes the resistance value to change, and the circuit outputs a voltage signal, which is sent to the PLC controller 16 after being amplified several times and subjected to analog-to-digital conversion]. The PLC controller 16 controls the normally open solenoid valve 115 to close, and at the same time controls the normally closed solenoid valve 117 to open, enabling the filtered gas to enter the position of the refrigeration pipe 118 through the air guide pipe 116. After being cooled by the refrigeration pipe 118, it is discharged into the cooling pipe 12 and finally into the interior of the detection box 1 for cooling treatment [keeping the temperature inside the detection box 1 at about 25°C], avoiding the situation that the detection accuracy is reduced due to the too high temperature inside the detection box 1;

[0052] After the packaged food is cleaned by the air-blowing dust removal mechanism 10 and the temperature inside the detection box 1 is monitored and regulated, the serrated conveyor belt 7 will convey the packaged food into the interior of the detection box 1, enabling the packaged food to pass between the X-ray generator 2 and the X-ray detector 3, and enabling the detection of whether there are foreign objects in the packaged food [the X-ray generator 2 generates an X-ray beam that shoots at the packaged food. Since different substances have different absorption degrees for X-rays, the food, packaging materials and foreign objects have different absorptions. Foreign objects with a large density absorb more X-rays, resulting in an obvious attenuation of the intensity of the penetrated X-ray in the foreign object area. The X-ray detector 3 receives the penetrated X-ray and converts it into an electrical signal, which is processed and then sent to the PLC controller 16. An image of the packaged food with foreign objects is displayed on the display of the PLC controller 16];

[0053] During the process of foreign object detection, the PLC controller 16 will stop the operation of the serrated conveyor belt 7, causing the packaged food to stop between the X-ray generator 2 and the X-ray detector 3. At this time, the PLC controller 16 will control the motor 145 to operate. The motor 145 can drive the rotating shaft 146 to rotate, and the rotating shaft 146 can drive the gear 144 to rotate. The gear 144 drives the rotating tube 142, the X-ray generator 2, and the X-ray detector 3 to rotate inside the annular support plate 151, so as to change the detection angle of the X-ray generator 2 and the X-ray detector 3 for the packaged food, enabling the X-ray beam to pass through the inside of the packaged food at multiple angles, avoiding the situation where some foreign objects cannot be detected due to inappropriate angles, and improving the detection accuracy;

[0054] During the rotation of the rotating tube 142, it will drive the light-shielding ring 184 to rotate together, so that the light-transmitting holes 185 at different positions on the light-shielding ring 184 pass between the general light source 181 and the general light detector 183. When the general light source 181 irradiates the general light detector 183 through the light-transmitting hole 185, the general light detector 183 will feedback an electrical signal to the PLC controller 16 [the general light detector 183 contains a photoelectric effect material. When irradiated by the light of the general light source 181, photons cause electron-hole pairs to be generated in the material, forming a photocurrent. The photocurrent is amplified, filtered, etc. and then transmitted to the PLC controller 16], causing the PLC controller 16 to stop the operation of the motor 145, so that the X-ray generator 2 and the X-ray detector 3 maintain an angle to detect the packaged food. Since there are multiple light-transmitting holes 185, stable detection at multiple angles can be achieved;

[0055] When no foreign object appears inside the packaged food, the PLC controller 16 immediately controls the serrated conveyor belt 7 to operate, transports the packaged food to the position of the discharge rack 6, and finally the staff takes it out and places it in the position of qualified products for final packaging;

[0056] When a foreign object is detected inside the packaged food, the PLC controller 16 will control the alarm lamp 17 to light up and remind the staff. At the same time, the PLC controller 16 controls the liquid extraction pump 153 to operate, pumps the colored marking liquid inside the liquid storage tank 152 into the liquid supply pipe 154 and sprays it on the surface of the packaged food through the marking nozzle 155, marking that there is a foreign object inside the packaged food at this position. After the colored marking liquid is sprayed for 2 seconds, the PLC controller 16 immediately controls the serrated conveyor belt 7 to operate, transports the packaged food with foreign objects to the position of the discharge rack 6, and finally the staff takes it out and places it in the position of unqualified products, and the unqualified packaged food will be reworked.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An X-ray intelligent foreign object detector, comprising a detection box (1), an X-ray generator (2) and an X-ray detector (3), characterized in that, It further includes: A feeding rack (4), fixedly arranged on one side of the detection box (1), and a material discharging opening (5) is arranged on one side of the top of the feeding rack (4); A discharging rack (6), fixedly arranged on the other side of the detection box (1), and a same serrated conveyor belt (7) is arranged inside the detection box (1), inside the feeding rack (4) and inside the discharging rack (6); A food weighing mechanism (8), arranged inside the feeding rack (4), and the food weighing mechanism (8) is located below the material discharging opening (5); A pushing mechanism (9), arranged on the inner side wall of the feeding rack (4), and the pushing mechanism (9) is located on one side of the food weighing mechanism (8); A blowing and dust removing mechanism (10), arranged on the feeding rack (4) and extending to both sides of the serrated conveyor belt (7); A cooling mechanism (11), arranged on the side wall of the detection box (1), and a cooling pipe (12) extending into the detection box (1) is fixedly arranged on the side wall of the cooling mechanism (11). The cooling mechanism (11) is connected to the blowing and dust removing mechanism (10), and a temperature sensor (13) is fixedly arranged on the inner side wall of the detection box (1); A rotary detection mechanism (14), arranged inside the detection box (1), and both the X-ray generator (2) and the X-ray detector (3) are arranged on the rotary detection mechanism (14); A foreign object marking mechanism (15), arranged inside the detection box (1), and the foreign object marking mechanism (15) is located on one side of the rotary detection mechanism (14); A PLC controller (16), fixedly arranged on the top of the detection box (1), and an alarm lamp (17) is arranged on the top of the PLC controller (16). The serrated conveyor belt (7), the food weighing mechanism (8), the pushing mechanism (9), the blowing and dust removing mechanism (10), the cooling mechanism (11), the rotary detection mechanism (14) and the foreign object marking mechanism (15) are all electrically connected to the PLC controller (16).

2. The X-ray intelligent foreign object detector according to claim 1, characterized in that, The food weighing mechanism (8) includes a housing (81) fixedly arranged on the bottom inner wall of the feeding rack (4). An arc-shaped aluminum alloy elastic body (82) is fixedly arranged inside the housing (81). An arc-shaped resistance strain gauge (83) is arranged on the lower surface of the arc-shaped aluminum alloy elastic body (82). A downward pressing rod (84) extending outward is arranged on the upper surface of the arc-shaped aluminum alloy elastic body (82). A weighing platform (85) is fixedly arranged at the upper end of the downward pressing rod (84). A plurality of evenly distributed conveying rollers (86) are rotatably arranged on the upper surface of the weighing platform (85).

3. An X-ray intelligent foreign object detector according to claim 1, characterized in that, The pushing mechanism (9) includes a pushing cylinder (91) fixedly arranged on the inner wall of the feeding rack (4), and a pushing block (92) is fixedly arranged at the moving end of the pushing cylinder (91).

4. An X-ray intelligent foreign object detector according to claim 1, characterized in that, The air blowing and dust removing mechanism (10) includes an air compressor (101) fixedly arranged at the top of the feeding rack (4). The air outlet end of the air compressor (101) is fixedly provided with an air inlet pipe (102), and a gas flow regulating valve (103) is fixedly arranged on the pipe wall of the air inlet pipe (102). On one side of the inner wall of the feeding rack (4), a blowing plate (104) is fixedly arranged, and the top of the blowing plate (104) is fixedly connected to one end of the air inlet pipe (102). On the other side of the inner wall of the feeding rack (4), a suction fan (105) is fixedly arranged, and the top of the suction fan (105) is fixedly provided with a return air pipe (106) extending outwards.

5. An X-ray intelligent foreign object detector according to claim 4, characterized in that, The temperature reduction mechanism (11) includes a box body (111) fixedly arranged on the side wall of the detection box (1). A partition plate (112) is fixedly arranged inside the box body (111). A filter screen (113) is fixedly arranged inside the box body (111) and below the partition plate (112). An exhaust pipe (114) is fixedly arranged on the side wall of the box body (111) and below the partition plate (112), and a normally open solenoid valve (115) is arranged on the pipe wall of the exhaust pipe (114). A guide air pipe (116) is fixedly arranged in the middle of the partition plate (112), and a normally closed solenoid valve (117) is fixedly arranged on the pipe wall of the guide air pipe (116). A refrigeration pipe (118) is fixedly arranged inside the box body (111) and above the partition plate (112). One end of the temperature reduction pipe (12) is fixedly connected to the side wall of the box body (111). One end of the return air pipe (106) is fixedly connected to the side wall of the box body (111).

6. The X-ray intelligent foreign object detector according to claim 1, characterized in that, The rotation detection mechanism (14) includes an annular fixed plate (141) fixedly arranged on the inner wall of the detection box (1). The serrated conveyor belt (7) passes through the inside of the annular fixed plate (141). A rotating pipe (142) is rotatably arranged on the inner wall of one end of the annular fixed plate (141). The X-ray generator (2) and the X-ray detector (3) are respectively fixedly arranged on the inner wall of the top and the inner wall of the bottom of the rotating pipe (142). A gear ring (143) is fixedly arranged on one side of the rotating pipe (142), and a gear (144) is meshed with the top of the gear ring (143). A motor (145) is fixedly arranged on the side wall of the detection box (1). The output end of the motor (145) is fixedly provided with a rotating shaft (146) extending into the detection box (1), and one end of the rotating shaft (146) is fixedly connected to the gear (144). A rotation limiting mechanism (18) is arranged on the side of the rotating pipe (142) away from the gear ring (143).

7. The X-ray intelligent foreign object detector according to claim 6, characterized in that, The rotation limiting mechanism (18) includes a general light source (181) fixedly arranged on the inner wall of the top of the annular fixing plate (141). A bracket (182) is fixedly arranged on the inner wall of the top of the annular fixing plate (141). A general light detector (183) corresponding to the position of the general light source (181) is fixedly arranged on the horizontal part of the bracket (182). A light shielding ring (184) is fixedly arranged on the side of the rotating tube (142) away from the gear ring (143), and a plurality of light transmission holes (185) are formed in the side wall of the light shielding ring (184).

8. An X-ray intelligent foreign object detector according to claim 1, characterized in that, The foreign object marking mechanism (15) includes a support plate (151) fixedly arranged on the inner wall of the detection box (1). A liquid storage bin (152) is fixedly arranged on the upper surface of the support plate (151). A colored marking liquid is stored inside the liquid storage bin (152). A liquid pumping pump (153) is fixedly arranged on the inner wall of the bottom of the liquid storage bin (152). The output end of the liquid pumping pump (153) is fixedly provided with a liquid supply pipe (154) extending to the outside of the liquid storage bin (152), and the end of the liquid supply pipe (154) is fixedly provided with a marking nozzle (155).

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