Position detection device for high-temperature, high-humidity and high-pressure microwave sterilization environment

Abstract

A position detection device for a high-temperature, high-humidity and high-pressure microwave sterilization environment belongs to the technical field of microwave sterilization and sensors, and comprises a microwave sterilization device, a sensor body and a conveying mechanism, a sensor body is mounted on the side wall of the microwave sterilization device on one side of the bearing part, the sensor body comprises a rotating shaft which penetrates through the side wall and is rotationally connected with the side wall, a contactor matched with the foodstuff box for use is mounted at the inner side end of the rotating shaft, and a position and distance detection mechanism is connected to the outer side end of the rotating shaft; a controller and a display are further arranged on the outer wall of the microwave sterilization device, the position and distance detection mechanism and the display are electrically connected with the controller through wires, and the controller is electrically connected with the power module through a wire. The microwave sterilization device can be applied to a high-temperature, high-pressure and high-humidity microwave sterilization environment, the problems of unstable operation and damage of electric appliance elements can be avoided, and the position and displacement of the food box can be accurately detected.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave sterilization and sensors, and in particular relates to a position detection device used in a high-temperature, high-humidity and high-pressure microwave sterilization environment. Background Art

[0002] Food is very easy to be contaminated and spoiled during production, storage, transportation and sales. Conventional technologies such as high temperature, drying, blanching, pasteurization, freezing and preservatives can usually be used to achieve food sterilization and preservation, but they often affect the original flavor and nutritional components of the food. Microwave sterilization is to make the microorganisms in the food be affected by the microwave thermal effect and non-thermal effect at the same time, so that the proteins and physiological active substances in the body mutate, resulting in the delay of growth and development of the microorganisms and death, so as to achieve the purpose of food sterilization and preservation.

[0003] Food production lines are often equipped with microwave sterilization systems. Food boxes carrying food will move in an environment with high temperature, high humidity and high pressure driven by the carrying part, and the food will be sterilized by the microwave sterilization equipment configured in the system. During the sterilization process, in order to achieve a good sterilization effect, it is usually necessary to detect the position of the food. The current method for detecting the position of food is to use electrical components such as proximity switches. However, in a high temperature, high pressure and high humidity environment, electrical components such as proximity switches are prone to unstable operation or even damage, which seriously affects the use effect of the microwave sterilization system. Therefore, it is necessary to improve the existing technology. Summary of the invention

[0004] In response to the problems of the prior art, the present invention discloses a position detection device for use in a high-temperature, high-humidity and high-pressure microwave sterilization environment, with the aim of solving the following problems existing in the prior art: in the existing microwave sterilization system, in a high-temperature, high-pressure and high-humidity environment, electrical components such as proximity switches are prone to unstable operation or even damage, which seriously affects the use effect of the microwave sterilization system.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] A position detection device for a high-temperature, high-humidity, and high-pressure microwave sterilization environment comprises a microwave sterilization device and a sensor body. The interior of the microwave sterilization device constitutes a high-temperature, high-humidity, and high-pressure microwave sterilization environment. A transmission mechanism operates inside the microwave sterilization device. Food boxes are evenly arranged along the direction of the upper surface of a bearing portion of the transmission mechanism. A sensor body is installed on a side wall of the microwave sterilization device on one side of the bearing portion. The sensor body comprises a rotating shaft that penetrates the side wall and is rotatably connected to the side wall. A contactor used in conjunction with the food box is installed at the inner end of the rotating shaft. A position and distance detection mechanism is connected to the outer end of the rotating shaft. A controller and a display are also provided on the outer wall of the microwave sterilization device. The position and distance detection mechanism and the display are electrically connected to the controller through wires, respectively, and the controller is electrically connected to a power module through wires.

[0007] Preferably, the rotating shaft is rotatably connected to the side wall via a sealed bearing, the contactor comprises a first connecting block coaxially fixedly connected to the inner end of the rotating shaft, the rotating shaft is arranged in a direction perpendicular to the side wall, the outer surface of the first connecting block is fixedly connected to a roller bracket in a direction perpendicular to the rotating shaft, a roller is installed in the roller bracket, the roller is arranged horizontally and opposite to the front end of the food box, the length of the roller is greater than the width of the food box, and can roll along the top end of the food box.

[0008] Preferably, the position and distance detection mechanism includes a second connecting block coaxially fixedly arranged at the outer end of the rotating shaft, and the two ends of the second connecting block are coaxially fixedly connected with a balance rod and a detection rod perpendicular to the rotating shaft, and the outer end of the detection rod is coaxially opened with a first mounting groove, and the first mounting groove is installed with a transmitting end of a through-beam type photoelectric sensor, and an annular mounting plate is also coaxially fixedly arranged on the outer wall surface of the wave sterilization device located on the outer side of the rotating shaft, and a plurality of second mounting grooves arranged radially are evenly distributed on the inner surface of the annular mounting plate, and a receiving end of a through-beam type photoelectric sensor matched with the transmitting end is installed in the second mounting groove, and the transmitting end and the receiving end are electrically connected to the controller through wires respectively.

[0009] Preferably, the initial state of the sensor body is formed when the front end of the food box does not touch the drum. In the initial state, due to the gravity of the drum and the drum bracket, the drum bracket is in a vertical posture, the drum is in a horizontal posture along the horizontal direction, and the balance bar and the detection bar are in a horizontal posture.

[0010] Preferably, the plurality of second mounting grooves are arranged within a section of the arc range of the annular mounting plate, and the section of the arc range is located on the inner surface of the rear lower side of the annular mounting plate.

[0011] Preferably, the included angles of the axes of adjacent second mounting grooves are the same, and before the roller starts to contact the front end of the food box and rolls to the top of the food box, the included angles between the axes of each second mounting groove relative to the axis of the first second mounting groove above correspond one to one with the distance the food box moves forward relative to the position of the rotating shaft, and the receiving ends are numbered, and the controller determines the distance the food box moves forward relative to the rotating shaft and the current position of the food box relative to the rotating shaft based on the signals sent by each receiving end.

[0012] Preferably, a force control mechanism for controlling the horizontal backward force of the roller on the food box is also provided in the detection rod.

[0013] Preferably, a coaxially arranged mounting hole is provided in the detection rod, and the force control mechanism includes an electric cylinder, a cylinder barrel of the electric cylinder is fixedly connected to the inner wall of the mounting hole, a counterweight is fixedly connected to the end of the piston rod, and the counterweight is slidably connected to the mounting hole. The electric cylinder is electrically connected to the controller via a wire, and the controller controls the position of the counterweight in the mounting hole to control the force applied by the roller to the food box in the horizontal backward direction to be smaller than the friction between the food box and the load-bearing part. At the same time, the roller maintains contact with the front end of the food box.

[0014] Preferably, the transmission mechanism is driven by a driving motor, and the controller is electrically connected to the driving motor via a wire.

[0015] Preferably, the outer wall of the microwave sterilization device is also provided with a warning light, the controller is electrically connected to the warning light via a wire, and the controller is also signal-connected to the equipment safety management center of the production line where the microwave sterilization device is located via a wireless signal transceiver.

[0016] A method for using a position detection device for a high-temperature, high-humidity, high-pressure microwave sterilization environment, including the following modes:

[0017] A. Detection of the position and moving distance of the food box;

[0018] B. Workload detection of microwave sterilization device: the controller is provided with a counting unit. The period from when the food box touches the contactor to when the contactor passes over the top of the food box and resets is one receiving end signal cycle. The counting unit counts the number of signal cycles within a set time period. The number of signal cycles is the number of food boxes detected by the sensor body, and this number is used as the workload of the microwave sterilization device within this time period.

[0019] C. Determine the type of food box: The food box is a cubic structure, and has multiple models according to the height and length. Each model is used to hold different types of food. When detecting the type of food box, the height difference of the food box determines the difference in the number of receiving ends that match the front end of the food box, and the length difference of the food box determines the length of time that the receiving end that matches the top end of the food box continues to send signals. The controller determines the type of food box according to the above-mentioned difference in number and time, and then determines the type of food contained in the food box;

[0020] D. Fault alarm: When the conveying mechanism is unloaded, the sensor body cannot detect the food box information within the set time period, and an alarm is issued through a warning light or a wireless signal transceiver; when the food box is stuck or the load-bearing part of the conveying mechanism stops rotating, the contactor cannot be separated from the food box, and the sensor body continues to detect the signal sent by the same receiving end within the set time, an alarm is issued through a warning light or a wireless signal transceiver.

[0021] Preferably, in the mode B, the counting unit not only calculates the total number of food boxes, but also calculates the number of each type of food boxes separately according to the type of food boxes.

[0022] The beneficial effects of the position detection device for high temperature, high humidity and high pressure microwave sterilization environment of the present invention are:

[0023] 1. The present invention places a contactor without a circuit structure inside the microwave sterilization device, and arranges a position and distance detection mechanism outside, thereby solving the problem of unstable operation and easy damage of electrical components.

[0024] 2. The position and distance detection mechanism of the sensor body of the present invention can detect not only the position of the food box but also the relative moving distance of the food box. A set of sensor bodies can solve the problem of position detection and distance detection of the food box at the same time.

[0025] 3. The present invention can ensure that the food box will not be displaced relative to the bearing part due to the action of the contactor by providing a force control mechanism, thereby ensuring the accuracy of the measurement result.

[0026] 4. The sensor body of the present invention can also be used to count the workload of the microwave sterilization device, identify the type of food box and the type of food contained therein, and issue an alarm in the event of equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 , a schematic diagram of the overall side sectional structure of the present invention;

[0028] Figure 2 , a left-side structural schematic diagram of the present invention;

[0029] Figure 3 , a schematic diagram of the structure of the rear view angle of the sensor body of the present invention;

[0030] Figure 4 , a schematic diagram of the structure of the sensor body of the present invention from a top view angle;

[0031] Figure 5 , a schematic diagram of the local structure of A of the present invention;

[0032] Figure 6 , a schematic diagram of the local structure of B of the present invention;

[0033] Figure 7 , a schematic diagram of the local structure of the present invention at C;

[0034] 1. Microwave sterilization device; 2. Transmission mechanism; 3. Food box; 4. Driving motor; 5. Controller; 6. Display; 7. Rotating shaft; 8. Second connecting block; 9. Detection rod; 10. Transmitting end; 11. First connecting block; 12. Roller bracket; 13. Roller; 14. Balance rod; 15. Sealed bearing; 16. Annular mounting plate; 17. Forward direction of food box; 18. Mounting hole; 19. Electric cylinder; 20. Counterweight block; 21. Second mounting slot; 22. Receiving end. DETAILED DESCRIPTION

[0035] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0036] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0037] In the initial embodiment, the present invention is a position detection device for high temperature, high humidity and high pressure microwave sterilization environment, such as Figure 1-7As shown, it includes a microwave sterilization device 1 and a sensor body. The microwave sterilization device 1 has a high temperature, high humidity and high pressure microwave sterilization environment, and its humidity, temperature and pressure are determined according to the measured humidity, temperature and pressure of the commonly used microwave sterilization device. A transmission mechanism 2 is operated inside the microwave sterilization device 1. The upper surface of the bearing part of the transmission mechanism 2 is evenly arranged with food boxes 3 along the direction. A sensor body is installed on the side wall of the microwave sterilization device 1 on one side of the bearing part. The sensor body includes a rotating shaft 7 that penetrates the side wall and is rotatably connected to the side wall. A contactor used in conjunction with the food box 3 is installed at the inner end of the rotating shaft 7. A position and distance detection mechanism is connected to the outer end of the rotating shaft 7. A controller 5 and a display 6 are also provided on the outer wall of the microwave sterilization device 1. The position and distance detection mechanism and the display 6 are electrically connected to the controller 5 through wires, and the controller 5 is electrically connected to the power module through wires. In this embodiment, the microwave sterilization device 1 can be any device disclosed in the prior art that sterilizes food by microwaves, and its specific structure and principle are not repeated. Due to the high temperature, high pressure and high humidity environment inside the microwave sterilization device, electrical components are prone to unstable operation or even damage. The present invention places a contactor without a circuit structure inside the microwave sterilization device, and sets the position and distance detection mechanism outside, thereby solving the problem of unstable operation and easy damage of electrical components. On the other hand, the position and distance detection mechanism can detect the position of the food box and the relative movement distance of the food box. A set of sensor bodies solves the problems of position detection and distance detection at the same time. It should be noted that the transmission mechanism involved in the present invention is a common technology. For example, it can be a conveyor belt mechanism, and the bearing part is the conveyor belt in the conveyor belt mechanism used to carry the food box.

[0038] In a further embodiment, Figure 1-7As shown, the rotating shaft 7 is rotatably connected to the side wall through a sealed bearing 15. The sealed bearing is a prior art, which is suitable for high temperature, high humidity, and high pressure environments and can ensure sealing. The contactor includes a first connecting block 11 coaxially fixedly connected to the inner end of the rotating shaft 7. The rotating shaft 7 is arranged in a direction perpendicular to the side wall. The outer surface of the first connecting block 11 is fixedly connected with a roller bracket 12 in a direction perpendicular to the rotating shaft 7. A roller 13 is installed in the roller bracket 12. The roller 13 is arranged in the horizontal direction and is opposite to the front end of the food box 3. The length of the roller 13 is greater than the width of the food box 3 and can roll along the top of the food box 3. In this embodiment, the function of setting the roller is: when the front end of the food box touches the roller and moves forward, the roller rolls along the front end surface of the food box, which can greatly reduce the friction between the two, and avoid excessive friction between the contactor and the food box, which has a greater impact on the friction between the bottom of the food box and the upper end of the bearing part (which may cause the food box to move and cause inaccurate measurement). At the same time, it also avoids interference of the food box with the contactor, and ensures that the contactor can easily pass over the food box after detecting the position and moving distance of the food box, and detect the position and moving distance of the next food box after passing.

[0039] In a further embodiment, Figure 1-7 As shown, the position and distance detection mechanism comprises a second connection block 8 coaxially fixedly arranged at the outer end of the rotating shaft 7, and the two ends of the second connection block 8 are coaxially fixedly connected with a balance bar 14 and a detection bar 9 which are perpendicular to the rotating shaft 7, respectively, and the outer end of the detection bar 9 is coaxially provided with a first mounting groove (not marked in the figure, as shown in FIG. Figure 3-7 As shown in the figure, the transmitting end 10 of the through-beam photoelectric sensor is installed in the first installation groove, and an annular installation plate 16 is coaxially fixed on the outer wall surface of the wave sterilization device 1 outside the rotating shaft 7. The inner surface of the annular installation plate 16 is evenly distributed with a plurality of second installation grooves 21 arranged radially. The receiving end 22 of the through-beam photoelectric sensor matched with the transmitting end 10 is installed in the second installation groove 21. The transmitting end 10 and the receiving end 22 are electrically connected to the controller 5 through wires. In this embodiment, as shown in the figure, Figure 1 , 2As shown in , 7, the food box touches the roller during the process of moving forward, and the roller drives the rotating shaft to rotate through the roller bracket, and the rotating shaft drives the detection rod and the balance rod to rotate at the same time. When the transmitting end at the outer end of the detection rod rotates to be opposite to the receiving end, the controller receives the signal. When the controller receives the signal, it can calculate the position of the food box currently detected, where the position of the food box refers to the position of the food box relative to the rotating shaft, and the position of the rotating shaft in the microwave sterilization device is known, so it is equivalent to measuring the position of the food box in the microwave sterilization device. It should be noted that the transmitting end in this embodiment can also be replaced by an infrared light transmitter, and the receiving end can be configured as a photoelectric sensor, and the infrared light emitted by the infrared light transmitter triggers the photoelectric sensor signal.

[0040] In a further embodiment, Figure 1-7 As shown, the sensor body is in the initial state when the front end of the food box 3 does not touch the roller 13. In the initial state, due to the gravity of the roller 13 and the roller bracket 12, the roller bracket 12 is in a vertical position, the roller 13 is in a horizontal position along the lateral direction, and the balance bar 14 and the detection bar 9 are in a horizontal position. This embodiment provides the principle that the roller can automatically reset after passing over the food box due to gravity.

[0041] In a further embodiment, Figure 1-7 As shown, a plurality of second mounting grooves 21 are provided within a section of the arc range of the annular mounting plate 16, and the section of the arc range is located on the inner surface of the lower rear side of the annular mounting plate 16. In this embodiment, the position and size of the section of the arc range are determined according to the rotation range of the transmitting end during the interaction between the food box and the drum during the detection. The more receiving ends are provided, the higher the detection accuracy.

[0042] In a further embodiment, Figure 1-7As shown, the included angles of the axes of adjacent second mounting grooves 21 are the same. Since the second mounting grooves are arranged radially, the axes of each second mounting groove intersect with the axis of the rotating shaft at point A, that is, the light between the transmitting end and the receiving end is collinear with the common axis of the first mounting groove and the second mounting groove when they are relative to each other; before the drum 13 starts to contact the front end of the food box 3 and does not roll to the top of the food box 3, the included angle between the axes of each second mounting groove 21 relative to the axis of the first second mounting groove above corresponds to the distance that the food box 3 moves forward relative to the position of the rotating shaft 7, and the distance can be obtained by experimental measurement or software simulation; the receiving end 22 is numbered, and the controller 5 determines the distance that the food box 3 moves forward relative to the rotating shaft 7 and the current position of the food box 3 relative to the rotating shaft 7 according to the signals sent by each receiving end 22. In this embodiment, the angle of rotation of the contactor around the rotating shaft corresponds one to one with the rotation angle of the transmitting end, and the angle of rotation of the contactor, i.e., the drum, around the rotating shaft corresponds one to one with the distance the food box moves forward. Therefore, the above-mentioned "the angle between the axis of each second mounting groove 21 relative to the axis of the first second mounting groove above corresponds one to one with the distance the food box 3 moves forward relative to the position of the rotating shaft 7". Therefore, the controller can determine the displacement and position of the food box according to the corresponding receiving end signal.

[0043] In a further embodiment, Figure 2 , 6 As shown in Figure 7, the detection rod 9 is also provided with a force control mechanism for controlling the horizontal backward force of the roller 13 on the food box 3. By providing the force control mechanism, it can be ensured that the food box will not be displaced relative to the bearing part due to the action of the contactor, thereby ensuring the accuracy of the measurement result.

[0044] In a further embodiment, Figure 2 , 6 As shown in , 7, the detection rod 9 is provided with a coaxially arranged mounting hole 18, the force control mechanism includes an electric cylinder 19, the cylinder barrel of the electric cylinder 19 is fixedly connected to the inner wall of the mounting hole 18, a counterweight 20 is fixedly connected to the end of the piston rod, the counterweight 20 is slidably connected to the mounting hole 18, the electric cylinder 19 is electrically connected to the controller 5 through a wire, the controller 5 controls the position of the counterweight 20 in the mounting hole 18 to control the force applied by the roller 13 to the food box 3 in the horizontal backward direction to be smaller than the friction between the food box 3 and the bearing part, at the same time, the roller keeps in contact with the front end of the food box. In this embodiment, Figure 7As shown, when the counterweight is pushed outward by the electric cylinder, the force arm between the counterweight and the center point of the second connecting block is extended, and the force applied by the roller to the food box in the horizontal backward direction is reduced through transmission, thereby preventing the food box from being displaced by the force of the roller. In this embodiment, the friction between the food box and the bearing part can be measured or calculated by experiment, the weight and size of the counterweight can be set according to the needs of the actual structure, and the size and model of the electric cylinder can be selected from commercial products according to the size of the microwave sterilization device and the size of the sensor body. In this embodiment, when a set receiving end sends a signal, it means that the roller is about to roll to the top of the food box and pass over the food box along the top of the food box. Taking this time as the starting point, within the set time period, the controller resets the counterweight driven by the electric cylinder. In this way, when the roller completely passes over the food box, the roller and the roller bracket reset due to their own gravity, that is, they are ready to detect the next food box.

[0045] In a further embodiment, Figure 1 , 2 As shown, the conveying mechanism 2 is driven by a driving motor 4, and the controller 5 is electrically connected to the driving motor 4 through a wire. In this embodiment, if the microwave sterilization device needs to temporarily fix the food box at the detection position after detecting the position of the food box, the controller controls the driving motor to turn off.

[0046] In a further embodiment, Figure 2 As shown, the outer wall of the microwave sterilization device is also provided with a warning light, the controller is electrically connected to the warning light through a wire, and the controller is also connected to the equipment safety management center of the production line where the microwave sterilization device is located through a wireless signal transceiver. In this embodiment, when the sensor body detects fault information, the warning light lights up, and at the same time, the maintenance personnel of the equipment safety management center are notified through a wireless signal to intervene.

[0047] In a further embodiment, Figure 1-7 As shown, the present invention also discloses a method for using a position detection device for a high temperature, high humidity and high pressure microwave sterilization environment, including the following modes:

[0048] A. Detection of the position and movement distance of the food box; see the above embodiment for the specific method;

[0049] B. Workload detection of microwave sterilization device: the controller is provided with a counting unit. The period from when the food box touches the contactor to when the contactor passes over the top of the food box and resets is one receiving end signal cycle. The counting unit counts the number of signal cycles within a set time period. The number of signal cycles is the number of food boxes detected by the sensor body, and this number is used as the workload of the microwave sterilization device within this time period.

[0050] C. Determine the type of food box: The food box is a cubic structure, and has a variety of models according to the difference in height and length. Each model is used to hold different types of food. When detecting the type of food box, the height difference of the food box determines the difference in the number of receiving ends that cooperate with the front end of the food box, and the length difference of the food box determines the length of time that the receiving end that cooperates with the top of the food box continues to send signals. The controller determines the type of food box according to the above-mentioned number difference and time length, and then determines the type of food contained in the food box; wherein, the height difference of the food box determines the difference in the number of receiving ends that cooperate with the front end of the food box, which means that: due to the different heights of the food box, when the front end of the food box cooperates with the contactor, the angle at which the contactor drives the rotating shaft to rotate is different, so the number of triggered receiving ends is also different. This quantity difference is correlated with the height of the food box; similarly, when the top of the food box contacts the roller, the roller needs to roll along the top of the food box and pass over the food box. Due to the different lengths of the food boxes, the contact time between the roller and the top of the food box is also different, which is reflected in the difference in the length of time that the receiving end that detects the top of the food box and the roller continues to send signals, that is, the length of time is correlated with the length of the food box, and the type of food box can be determined by comprehensive detection of the height and length of the food box; in actual design, the receiving end should be designed to specifically detect the top of a certain type of food box, that is, when the contactor drives the shaft to rotate to the corresponding angle of the receiving end, the roller starts to move along the top of the food box. Conversely, the process of the roller moving along the top of the food box can always be fed back through the signal of the receiving end;

[0051] D. Fault alarm: When the conveying mechanism is unloaded, the sensor body cannot detect the food box information within the set time period, and an alarm is issued through a warning light or a wireless signal transceiver; when the food box is stuck or the load-bearing part of the conveying mechanism stops rotating, the contactor cannot be separated from the food box, and the sensor body continues to detect the signal sent by the same receiving end within the set time, an alarm is issued through a warning light or a wireless signal transceiver.

[0052] It is understandable that in the mode B, the counting unit can not only count the total number of food boxes, but also count the number of each type of food boxes separately according to the type of food boxes.

[0053] Working principle of the present invention:

[0054] like Figure 1 As shown, the food box moves forward driven by the bearing part, and when the front end of the food box contacts the roller, the roller rotates along the front end of the food box and drives the launch end to rotate counterclockwise through the transmission, as shown in FIG. Figure 2As shown in the figure, the transmitting end triggers each receiving end in turn during the rotation process, and the controller automatically identifies the position and displacement of the food box according to the number of each receiving end. After the last receiving end is triggered, the roller passes over the food box along the top of the food box. Due to the effect of gravity, the contactor automatically resets and prepares to detect the next food box.

Claims

1. A position detection device for a high-temperature, high-humidity, high-pressure microwave sterilization environment, comprising a microwave sterilization device and a sensor body, wherein the microwave sterilization device internally constitutes a high-temperature, high-humidity, high-pressure microwave sterilization environment, and is characterized by: A transmission mechanism operates inside the microwave sterilization device, and food boxes are evenly arranged along the upper surface of the bearing part of the transmission mechanism. A sensor body is installed on the side wall of the microwave sterilization device on one side of the bearing part. The sensor body includes a rotating shaft that penetrates the side wall and is rotatably connected to the side wall. A contactor used in conjunction with the food box is installed at the inner end of the rotating shaft, and a position and distance detection mechanism is connected to the outer end of the rotating shaft. A controller and a display are also provided on the outer wall of the microwave sterilization device. The position and distance detection mechanism and the display are electrically connected to the controller through wires, and the controller is electrically connected to the power module through wires.

2. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 1, characterized in that: The rotating shaft is rotatably connected to the side wall through a sealed bearing, and the contactor includes a first connecting block coaxially fixedly connected to the inner end of the rotating shaft. The rotating shaft is arranged in a direction perpendicular to the side wall, and the outer surface of the first connecting block is fixedly connected to a roller bracket in a direction perpendicular to the rotating shaft. A roller is installed in the roller bracket, and the roller is arranged horizontally and opposite to the front end of the food box. The length of the roller is greater than the width of the food box and can roll along the top end of the food box.

3. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 2, characterized in that: The position and distance detection mechanism includes a second connecting block coaxially fixedly arranged at the outer end of the rotating shaft, and the two ends of the second connecting block are coaxially fixedly connected with a balance rod and a detection rod perpendicular to the rotating shaft, and the outer end of the detection rod is coaxially provided with a first mounting groove, and the first mounting groove is installed with a transmitting end of a through-beam type photoelectric sensor, and an annular mounting plate is coaxially fixedly arranged on the outer wall surface of the wave sterilization device located on the outer side of the rotating shaft, and a plurality of second mounting grooves arranged radially are evenly distributed on the inner surface of the annular mounting plate, and a receiving end of the through-beam type photoelectric sensor matched with the transmitting end is installed in the second mounting groove, and the transmitting end and the receiving end are electrically connected to the controller through wires respectively.

4. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 3, characterized in that: When the front end of the food box does not touch the drum, it constitutes the initial state of the sensor body. In the initial state, due to the gravity of the drum and the drum bracket, the drum bracket is in a vertical posture, the drum is in a horizontal posture along the horizontal direction, and the balance bar and the detection bar are in a horizontal posture.

5. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 4, characterized in that: A plurality of second mounting grooves are arranged within a section of the arc range of the annular mounting plate, and the section of the arc range is located on the inner surface of the rear lower side of the annular mounting plate.

6. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 5, characterized in that: The included angles of the axes of adjacent second mounting grooves are the same. Before the roller starts to contact the front end of the food box and rolls to the top of the food box, the included angles between the axes of each second mounting groove relative to the axis of the first second mounting groove above correspond to the distance the food box moves forward relative to the position of the rotating shaft. The receiving ends are numbered, and the controller determines the distance the food box moves forward relative to the rotating shaft and the current position of the food box relative to the rotating shaft based on the signals sent by each receiving end.

7. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 6, characterized in that: The detection rod is also provided with a force control mechanism for controlling the horizontal backward force of the roller on the food box; a coaxially arranged mounting hole is opened in the detection rod, and the force control mechanism includes an electric cylinder, the cylinder barrel of the electric cylinder is fixedly connected to the inner wall of the mounting hole, and the end of the piston rod is fixedly connected to a counterweight block, and the counterweight block is slidingly connected to the mounting hole. The electric cylinder is electrically connected to the controller through a wire, and the controller controls the position of the counterweight block in the mounting hole to control the force applied by the roller to the food box in the horizontal backward direction to be smaller than the friction between the food box and the load-bearing part. At the same time, the roller maintains contact with the front end of the food box.

8. A position detection device for high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 7, characterized in that: The transmission mechanism is driven by a driving motor, and the controller is electrically connected to the driving motor through a wire; a warning light is also provided on the outer wall of the microwave sterilization device, and the controller is electrically connected to the warning light through a wire. The controller is also connected to the equipment safety management center of the production line where the microwave sterilization device is located through a wireless signal transceiver.

9. A method for using a position detection device for a high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 8, characterized in that it includes the following modes: A. Detection of the position and moving distance of the food box; B. Workload detection of microwave sterilization device: the controller is provided with a counting unit. The period from when the food box touches the contactor to when the contactor passes over the top of the food box and resets is one receiving end signal cycle. The counting unit counts the number of signal cycles within a set time period. The number of signal cycles is the number of food boxes detected by the sensor body, and this number is used as the workload of the microwave sterilization device within this time period. C. Determine the type of food box: The food box is a cubic structure, and has multiple models according to the height and length. Each model is used to hold different types of food. When detecting the type of food box, the height difference of the food box determines the difference in the number of receiving ends that match the front end of the food box, and the length difference of the food box determines the length of time that the receiving end that matches the top end of the food box continues to send signals. The controller determines the type of food box according to the above-mentioned difference in number and time, and then determines the type of food contained in the food box; D. Fault alarm: When the conveying mechanism is unloaded, the sensor body cannot detect the food box information within the set time period, and an alarm is issued through a warning light or a wireless signal transceiver; when the food box is stuck or the load-bearing part of the conveying mechanism stops rotating, the contactor cannot be separated from the food box, and the sensor body continues to detect the signal sent by the same receiving end within the set time, an alarm is issued through a warning light or a wireless signal transceiver.

10. A method for using a position detection device for a high temperature, high humidity and high pressure microwave sterilization environment as claimed in claim 9, characterized in that: In the mode B, the counting unit not only counts the total number of food boxes, but also counts the number of each type of food boxes separately according to the type of food boxes.

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