Aircraft meal tray visual dimension detection and automatic conveying device

Abstract

The application relates to the technical field of airplane meal tray detection, and specifically discloses an airplane meal tray visual size detection and automatic conveying device, which comprises a base, a roller conveyor and a controller. The roller conveyor is installed at the top end of the base, and the controller is installed at the left front corner of the roller conveyor. The controller controls the start and stop of the roller conveyor, and the roller conveyor conveys airplane meal trays from left to right. First and second supports are respectively installed at the left and right ends of the rear side of the roller conveyor. A CCD camera electrically connected with the controller is installed at the front end of the first support. A lifter electrically connected with the controller is installed at the right side of the upper surface of the base. A lifting mechanism is installed at the output end of the lifter. The application can automatically identify whether the weight of the meal tray is qualified, avoid the risk of short service life and easy damage of underweight products, and avoid the problem of increased airplane take-off and landing distance caused by overweight parts, so as to meet the design control requirements of the aviation parts.

Description

Technical Field

[0001] This invention relates to the field of aircraft meal tray inspection technology, specifically to an aircraft meal tray visual size inspection and automatic conveying device. Background Technology

[0002] A serving tray table is a support structure installed behind the seats in a vehicle, providing support for passengers to place their meals and electronic devices, meeting the needs of passengers on long journeys. Airplanes are the most widely used mode of transportation for serving tray tables. After injection molding, the dimensions of airplane serving tray tables are generally inspected using visual inspection equipment.

[0003] Aircraft rely on air lift for flight and are considered precision transportation vehicles. Therefore, strict requirements exist for controlling the overall weight of the aircraft. Weight deviations in airborne components can have a cumulative effect, directly impacting the aircraft's load performance. Existing testing equipment can only visually inspect the dimensions of the tabletop and cannot simultaneously measure its weight. If the tabletop weight is below design standards, the product's structural strength is insufficient, significantly increasing the risk of damage during use. If the tabletop weight exceeds the standard, the cumulative weight of components will increase the overall aircraft load, increase takeoff and landing distances, and adversely affect the aircraft's flight performance.

[0004] On the other hand, the dining table is made of injection-molded plastic, and molding stress may remain inside the components after molding, which can easily cause warping and deformities. If such substandard products are not screened out and are directly installed and used, not only will the assembly work be time-consuming and labor-intensive, but it will also cause the dining table to jam when opening and closing, seriously affecting the user experience of passengers. Summary of the Invention

[0005] The purpose of this invention is to provide a visual size detection and automatic conveying device for aircraft meal trays, so as to solve the problem that the existing technology cannot detect the weight and deformity of aircraft meal trays.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a visual size detection and automatic conveying device for an aircraft meal tray, comprising a base, a roller conveyor, and a controller. The roller conveyor is installed at the top of the base, and the controller is installed at the front left corner of the roller conveyor. The controller controls the start and stop of the roller conveyor, allowing the roller conveyor to convey the aircraft meal tray from left to right. A first bracket and a second bracket are respectively installed at the left and right ends of the rear side of the roller conveyor. A CCD camera electrically connected to the controller is installed at the front end of the first bracket. A lifter electrically connected to the controller is installed on the right side of the upper surface of the base. A lifting mechanism is installed at the output end of the lifter. The lifting mechanism can lift the aircraft meal tray through the lifter to determine whether the weight of the aircraft meal tray meets the standard. A warping detection mechanism is installed at the front end of the second bracket to determine the levelness of the aircraft meal tray.

[0007] Preferably, the lifting mechanism includes a frame installed at the output end of the lifter. A rotating shaft is mounted on the inner side of the frame via bearings. A toothed gear and a threshold adjustment component are respectively installed at the front and rear ends of the rotating shaft. The threshold adjustment component controls the torque borne by the toothed gear. A limit groove is formed on the side wall of the toothed gear. A sensor is installed on the front of the toothed gear at a position corresponding to the limit groove. A limit component is installed at the bottom of the inner side of the frame. The limit component cooperates with the limit groove to control the rotation range of the toothed gear. Moreover, the limit component cooperates with the sensor to measure the weight of the aircraft meal tray.

[0008] Preferably, the lifting mechanism further includes a platform installed on the upper surface of the frame. Lifting rods are slidably connected to the four corners of the upper surface of the platform. A support plate is installed at the top of the lifting rod to lift the aircraft meal table. A reinforcing rib is installed at the bottom of the lifting rod, and a rack that meshes with a toothed gear is installed at the center of the lower surface of the reinforcing rib. This provides support for the aircraft meal table and is responsible for lifting the aircraft meal table.

[0009] Preferably, the threshold adjustment assembly includes a hollow swing arm mounted on the outer wall of the rotating shaft. A damping stop knob is installed at the right end of the swing arm, and a screw is installed at the left end of the damping stop knob. The other end of the screw is mounted to the inner wall of the swing arm via a bearing. When the damping stop knob drives the screw to rotate, it can stop the screw at any time to prevent the screw from rotating freely. A counterweight is slidably connected to the outer wall of the swing arm and engages with the screw thread. The threshold value is changed by moving the counterweight, which is suitable for measuring the weight of aircraft meal trays made of different materials.

[0010] Preferably, a scale is provided on the front of the swing arm.

[0011] Preferably, the limiting component includes a vertical rod installed at the bottom of the inner side of the frame. When the vertical rod is inserted into the inner cavity of the limiting groove, it controls the rotation range of the toothed gear. A mounting plate is installed on the top front of the vertical rod. From left to right, a first proximity switch, a second proximity switch, and a third proximity switch electrically connected to the controller are installed on the upper surface of the mounting plate. The weight signal of the aircraft meal tray is converted into an electrical signal, and the weight of the aircraft meal tray is determined based on the change of the electrical signal to determine whether the weight meets the standard.

[0012] Preferably, the warping detection mechanism includes a mounting base installed at the front end of the second bracket, an LED light is installed on the upper surface of the mounting base, and four amplification components are installed circumferentially on the outer wall of the mounting base, so that the LED light is illuminated by the cooperation of the four amplification components.

[0013] Preferably, the mounting base and the platform are on the same vertical line.

[0014] Preferably, the magnification component includes a slotted plate horizontally mounted on the outer wall of the mounting base. A counterweight column is slidably connected to the outer side of the slotted plate. A first guide wheel is mounted on the outer wall of the counterweight column. A linkage rod is mounted on the inner cavity of the slotted plate via a pin. Slide tracks are provided at both ends of the linkage rod. The first guide wheel is inserted into the inner cavity of the slide track. Under the gravity of the counterweight column, the first guide wheel is pressed down. As the first guide wheel rolls in the slide track, it pulls down the linkage rod. A limit rod is slidably connected to the inner side of the upper surface of the slotted plate. A second guide wheel is installed at the bottom of the outer wall of the limit rod and inserted into the inner cavity of the slide track. An arc-shaped insulator is installed at the top of the limit rod. A conductor electrically connected to an LED light is embedded inside the insulator, and the conductor is connected to a power source. The counterweight column, the first guide wheel, the second guide wheel, and the limit rod form a linkage mechanism to magnify the levelness of the aircraft meal table, thereby improving the accuracy of aircraft meal table deformity detection.

[0015] Preferably, the rotation center of the linkage rod is close to the counterweight column.

[0016] The present invention proposes a visual size detection and automatic conveying device for aircraft meal boards, which has the following advantages: 1. This invention uses a rising pallet to support an aircraft meal tray. Under the weight of the tray, a lifting rod drives a rack to descend, which in turn drives a toothed gear to rotate counterclockwise. A swing arm provides a counter-torque against the tray's weight. A sensor on the toothed gear rotates synchronously with it. When the sensor triggers the first proximity switch, it determines that the tray's weight is below the standard weight; when it triggers the third proximity switch, it determines that the product is overweight; and when it triggers the second proximity switch, it indicates that the tray's weight meets the standard. This device can automatically determine whether the tray's weight is acceptable, avoiding the risks of short lifespan and easy damage associated with underweight products. It also avoids the problem of increased takeoff and landing strokes caused by overweight components, thus meeting the design and control requirements for aerospace components.

[0017] 2. This invention uses an aircraft meal tray to lift a counterweight column, causing one end of a first guide wheel to swing upwards. The other end of the linkage rod then moves a second guide wheel, displacing a limit rod. Because the rotation center of the linkage rod is close to the counterweight column, the lifting and lowering displacement of the conductors can be amplified. When the aircraft meal tray has a tilting defect, height differences appear in the conductors, breaking the circuit and causing the LED light to lose power, thus identifying the tilting defective part. The device can screen out deformed and unqualified products, preventing defective parts from being directly installed on the aircraft, saving time and effort in assembly, and improving the passenger experience.

[0018] 3. This invention uses a rotating damping pause knob, which, through screw thread transmission, drives the counterweight to move left and right, changing the power arm of the swing arm, thereby adjusting the weight measurement threshold of the aircraft meal tray. The damping pause knob also enables screw self-locking, preventing the counterweight from freely shifting. The device is adaptable to the weight detection of various aircraft meal trays made of different materials, enhancing the versatility of the device. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is an exploded view of the lifting mechanism of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a perspective view of the threshold adjustment component of the present invention; Figure 5 This is a perspective view of the limiting component of the present invention; Figure 6 This is a perspective view of the warping detection mechanism of the present invention; Figure 7 This is a perspective view of the magnified component of the present invention; Figure 8 This is a schematic diagram of the insulator structure of the present invention.

[0020] In the diagram: 1. Base; 2. Roller conveyor; 3. Controller; 4. First support; 5. CCD camera; 6. Lifter; 7. Lifting mechanism; 8. Second support; 9. Warping detection mechanism; 71. Frame; 72. Rotating shaft; 73. Gear with missing teeth; 74. Threshold adjustment component; 75. Limiting groove; 76. Sensing plate; 77. Limiting component; 78. Platform; 79. Lifting rod; 710. Support plate; 711. Reinforcing rib; 712. Rack; 741. Swing rod; 742. Damping stop knob; 743, screw; 744, counterweight; 771, upright; 772, mounting plate; 773, first proximity switch; 774, second proximity switch; 775, third proximity switch; 91, mounting base; 92, LED light; 93, amplification component; 931, slot plate; 932, counterweight column; 933, first guide wheel; 934, linkage rod; 935, slide rail; 936, limit rod; 937, second guide wheel; 938, insulator; 939, conductor. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8This invention provides a technical solution: a visual size detection and automatic conveying device for an aircraft meal tray, comprising a base 1, a roller conveyor 2, and a controller 3. The roller conveyor 2 is installed at the top of the base 1, and the controller 3 is installed at the front left corner of the roller conveyor 2. The controller 3 controls the start and stop of the roller conveyor 2, allowing the roller conveyor 2 to convey the aircraft meal tray from left to right. A first bracket 4 and a second bracket 8 are respectively installed at the left and right ends of the rear side of the roller conveyor 2. A CCD camera 5 electrically connected to the controller 3 is installed at the front end of the first bracket 4. The CCD camera 5 extracts the aircraft meal tray size. The analog signal of the aircraft meal tray image is converted into a digital signal and fed back to the controller 3. The processor in the controller 3 detects the size of the aircraft meal tray based on the digital signal. The CCD camera 5 is equipped with a light source to improve the clarity of the image. The right side of the upper surface of the base 1 is equipped with a lifter 6 that is electrically connected to the controller 3. The output end of the lifter 6 is equipped with a lifting mechanism 7. The lifter 6 can lift the aircraft meal tray and determine whether the weight of the aircraft meal tray meets the standard. The front end of the second bracket 8 is equipped with a warping detection mechanism 9 to determine the levelness of the aircraft meal tray. The lifting mechanism 7 includes a frame 71 installed at the output end of the lifter 6. A rotating shaft 72 is mounted on the inner side of the frame 71 via bearings. A toothed gear 73 and a threshold adjustment component 74 are respectively installed at the front and rear ends of the rotating shaft 72. The threshold adjustment component 74 adjusts the torque borne by the toothed gear 73. A limit groove 75 is opened on the side wall of the toothed gear 73. The limit groove 75 controls the rotation range of the toothed gear 73. A sensor plate 76 is installed on the front of the toothed gear 73 at a position corresponding to the limit groove 75. The sensor plate 76 is made of lightweight material to avoid the interference of the gravity of the sensor plate 76 with the rotation state of the toothed gear 73, ensuring the accuracy of the aircraft meal tray weight measurement. A limit component 77 is installed on the bottom inner side of the frame 71. The limit component 77 cooperates with the limit groove 75 to control the rotation range of the toothed gear 73. Moreover, the limit component 77 cooperates with the sensor plate 76 to measure the weight of the aircraft meal tray.

[0023] The lightweight sensor 76 eliminates measurement deviations caused by its own added weight. The limiting groove 75 and the limiting component 77 work together to limit the rotation stroke of the toothed gear 73, which not only prevents the mechanism from overtravel, but also ensures a stable output of weight detection signals, thus guaranteeing the accuracy of the aircraft meal tray weight measurement results.

[0024] As a preferred embodiment, the lifting mechanism 7 further includes a platform 78 mounted on the upper surface of the frame 71. Lifting rods 79 are slidably connected to the four corners of the upper surface of the platform 78. A support plate 710 is installed at the top of the lifting rods 79 to lift the aircraft meal table. A reinforcing rib 711 is installed at the bottom of the lifting rods 79 to concentrate the weight on the four lifting rods 79, which facilitates the measurement of the weight of the aircraft meal table. A rack 712 that meshes with the toothed gear 73 is installed at the center of the lower surface of the reinforcing rib 711.

[0025] As a preferred embodiment, the threshold adjustment component 74 further includes a swing arm 741 mounted on the outer wall of the rotating shaft 72. The swing arm 741 is hollow, and a scale is provided on the front of the swing arm 741 as a reference for adjusting the gravity of the counterweight 744, thereby improving the accuracy of the adjustment of the counterweight 744. A damping stop knob 742 is installed on the right end of the swing arm 741, and one end of a screw 743 is installed on the left end of the damping stop knob 742. The other end of the screw 743 is installed on the inner wall of the swing arm 741 through a bearing. When the damping stop knob 742 drives the screw 743 to rotate, it can stop the screw 743 at any time, preventing the screw 743 from rotating freely. A counterweight 744 is slidably connected to the outer wall of the swing arm 741 and engages with the screw 743 thread. When the screw 743 rotates clockwise or counterclockwise, the rotational force of the screw 743 thread drives the counterweight 744 to move left and right, thereby reducing or increasing the power arm of the swing arm 741.

[0026] The weight measurement threshold is adjusted by the interaction of the swing arm 741, the damping stop knob 742, the screw 743 and the counterweight 744, which change the lever arm of the counterweight 744 through threaded transmission. The scale on the swing arm 741 can improve the accuracy of the position adjustment of the counterweight 744. The damping stop knob 742 can lock the screw 743 to prevent the counterweight 744 from shifting due to equipment vibration. It is suitable for weight detection of various aircraft meal trays made of different materials.

[0027] As a preferred embodiment, the limiting component 77 further includes a vertical rod 771 installed at the bottom inner side of the frame 71. When the vertical rod 771 is inserted into the inner cavity of the limiting groove 75, it controls the rotation range of the toothed gear 73, allowing the tray 710 to pause briefly, thus assisting in the detection of deformities of the aircraft meal tray. A mounting plate 772 is installed on the top front of the vertical rod 771. From left to right, a first proximity switch 773, a second proximity switch 774, and a third proximity switch 775, which are electrically connected to the controller 3, are installed on the upper surface of the mounting plate 772. When the sensing element 76 triggers the first proximity switch 773, the second proximity switch 774, or the third proximity switch 775, there are three measurement states, which are, in order, the weight of the aircraft meal tray is below the standard weight, the weight meets the standard, and the weight is overweight.

[0028] The rotation stroke of the missing tooth gear 73 is limited by the cooperation of the upright rod 771 and the limiting groove 75, providing a pause detection position for the tray 710, realizing the coordination of weight detection and deformity detection processes. By using the sensing cooperation of the first proximity switch 773, the second proximity switch 774, the third proximity switch 775 and the sensing plate 76, the weight status of the aircraft meal tray is converted into a recognizable electrical signal and transmitted to the controller 3. It can quickly distinguish between three product statuses: underweight, qualified, and overweight, and the detection response is stable.

[0029] As a preferred option, the warping detection mechanism 9 further includes a mounting base 91 installed at the front end of the second bracket 8. The mounting base 91 and the platform 78 are on the same vertical line to avoid eccentricity when the warping detection mechanism 9 detects the warp board and to avoid affecting the detection results. An LED light 92 is installed on the upper surface of the mounting base 91. The LED light 92 serves as a signal for the aircraft meal tray deformity. Four amplification components 93 are installed circumferentially on the outer wall of the mounting base 91. The LED light 92 is illuminated by the cooperation of the four amplification components 93.

[0030] As a preferred embodiment, the amplification component 93 further includes a slotted plate 931 horizontally mounted on the outer wall of the mounting base 91. A counterweight column 932 is slidably connected to the outer side of the slotted plate 931. A first guide wheel 933 is mounted on the outer wall of the counterweight column 932. A linkage rod 934 is mounted on the inner cavity of the slotted plate 931 via a pin. The rotation center of the linkage rod 934 is close to the counterweight column 932. The gravity of the counterweight column 932 is used to reset the linkage rod 934. Furthermore, it can sense the levelness of the aircraft dining table. The linkage rod 934 is pulled by the counterweight column 932 and the first guide wheel 933, amplifying the displacement generated by the linkage rod 934 pulling the second guide wheel 937, thereby improving the sensitivity of the rocker detection. Slide tracks 935 are provided at both ends of the linkage rod 934. The first guide wheel 933 is inserted into the inner cavity of the slide rail 935. Under the gravity of the counterweight column 932, the first guide wheel 933 is pressed down. As the first guide wheel 933 rolls in the slide rail 935, it pulls down the linkage rod 934. The inner side of the upper surface of the slot plate 931 is slidably connected to the limit rod 936. The bottom of the outer wall of the limit rod 936 is equipped with a second guide wheel 937 that is inserted into the inner cavity of the slide rail 935. The top of the limit rod 936 is equipped with an arc-shaped insulator 938. The insulator 938 has a conductor 939 that is electrically connected to the LED light 92 embedded inside. The conductor 939 is connected to a power source. The four conductors 939 form a closed circuit, which can make the LED light 92 light up. The aircraft meal table deformity problem is determined by the change in the height of the conductor 939.

[0031] The lever amplification effect of the linkage rod 934 amplifies the slight warping displacement of the dining table board, significantly improving the detection sensitivity of the warping defect. The on / off control of the LED light 92 by the circuit formed by the conductor 939 can intuitively provide feedback on the deformity detection results. At the same time, the counterweight column 932 can achieve automatic reset of the mechanism by its own weight, without the need for additional drive components, making the detection work stable and reliable.

[0032] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0033] Step 1: The roller conveyor 2 transports the aircraft meal tray from left to right. When it passes the CCD camera 5, the CCD camera 5 converts the analog signal of the aircraft meal tray image into a digital signal and feeds it back to the controller 3. The processor in the controller 3 analyzes the data and detects whether the size of the aircraft meal tray meets the standard. Step 2: Rotate the damping stop knob 742 clockwise or counterclockwise to make the screw 743 rotate clockwise or counterclockwise. The rotational force of the screw 743 drives the counterweight 744 to move left and right. Using the scale as a reference, make the driving force provided by the counterweight 744 to the swing arm 741 just equal to the weighing threshold of the airplane meal table. This threshold is based on the second proximity switch 774. Step 3: When the aircraft meal tray reaches directly above the lifting mechanism 7, the lifter 6 lifts the frame 71 upwards, and the lifting rod 79 on the platform 78 gradually rises, allowing the tray 710 to lift the aircraft meal tray. The weight of the aircraft meal tray is concentrated on the rack 712. When the rack 712 descends, the toothed gear 73 rotates counterclockwise. At the same time, the swing arm 741 on the rotating shaft 72 rotates in the same direction as the toothed gear 73. When the sensing plate 76 on the toothed gear 73 passes the first proximity switch 773, the first proximity switch 773 is triggered and sends an electrical signal back to the controller 3. The processor displays that the actual weight of the aircraft meal tray is less than the standard value. If the sensing plate 76 passes the second proximity switch 774, it means that the weight of the aircraft meal tray meets the standard. If the sensing plate 76 passes the third proximity switch 775, it means that the weight of the aircraft meal tray is overweight. Therefore, the weight detection of the aircraft meal tray is achieved. Step 4: As the aircraft meal tray rises and comes into contact with the counterweight column 932, the rack 712 continues to descend under the resistance of the counterweight column 932 until the upright 771 stops against the limiting groove 75, and the aircraft meal tray no longer has room to descend. Step 5: Raise the counterweight column 932 on the airplane meal tray. The counterweight column 932 drives the first guide wheel 933 to rise. Under the traction of the first guide wheel 933, one end of the linkage rod 934 swings upward, while the other end swings downward. The second guide wheel 937 pulls the limit rod 936 downward, causing the height of the conductor 939 on the insulator 938 to change. If the four conductors 939 descend synchronously and their height remains unchanged, a closed loop is still formed, and the LED light 92 illuminates, indicating that the airplane meal tray is not warped. If the height of the conductors 939 is not uniform, a closed loop cannot be formed, and the LED light 92 is de-energized and turns off, indicating that the airplane meal tray has warped, thus achieving the detection of deformities in the airplane meal tray. Step six, during reset, the lifter 6 lowers the tray 710. After the aircraft meal tray lands on the roller conveyor 2, the tray 710 no longer bears the weight of the aircraft meal tray. The swing arm 741 acts as the power arm of the toothed gear 73, causing the toothed gear 73 to drive the rack 712 to rise. The lifting rod 79 then drives the tray 710 to rise and reset, preparing for the re-measurement of the weight of the aircraft meal tray.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual size detection and automatic conveying device for an aircraft meal tray, comprising a base (1), a roller conveyor (2), and a controller (3), wherein the roller conveyor (2) is mounted on the top of the base (1), and the controller (3) is mounted on the left front corner of the roller conveyor (2), and the controller (3) controls the start and stop of the roller conveyor (2) to convey the aircraft meal tray from left to right, characterized in that, The roller conveyor (2) is equipped with a first bracket (4) and a second bracket (8) at the left and right ends of the rear side, respectively. The first bracket (4) is equipped with a CCD camera (5) electrically connected to the controller (3) at the front end. The base (1) is equipped with a lifter (6) electrically connected to the controller (3) on the right side of the upper surface. The lifter (6) is equipped with a lifting mechanism (7) at the output end. The lifter (6) can lift the airplane meal table and determine whether the weight of the airplane meal table meets the standard. The second bracket (8) is equipped with a warping detection mechanism (9) at the front end to determine the levelness of the airplane meal table. The lifting mechanism (7) includes a frame (71) installed at the output end of the lifter (6). A rotating shaft (72) is installed on the inner side of the frame (71) via a bearing. A toothed gear (73) and a threshold adjustment component (74) are respectively installed at the front and rear ends of the rotating shaft (72). The torque borne by the toothed gear (73) is adjusted by the threshold adjustment component (74). A limiting groove (75) is opened on the side wall of the toothed gear (73). A sensor (76) is installed on the front of the toothed gear (73) at a position corresponding to the limiting groove (75). A limiting component (77) is installed at the bottom of the inner side of the frame (71). The limiting component (77) cooperates with the limiting groove (75) to control the rotation range of the toothed gear (73). Moreover, the limiting component (77) and the sensor (76) cooperate to measure the weight of the aircraft meal tray.

2. The aircraft meal board visual size detection and automatic conveying device according to claim 1, characterized in that, The lifting mechanism (7) also includes a platform (78) installed on the upper surface of the frame (71). Lifting rods (79) are slidably connected to the four corners of the upper surface of the platform (78). A support plate (710) is installed at the top of the lifting rod (79) to lift the airplane dining table. A reinforcing rib (711) is installed at the bottom of the lifting rod (79). A rack (712) that meshes with the toothed gear (73) is installed at the center of the lower surface of the reinforcing rib (711).

3. The aircraft meal board visual size detection and automatic conveying device according to claim 2, characterized in that, The threshold adjustment component (74) includes a swing arm (741) installed on the outer wall of the rotating shaft (72). The swing arm (741) is hollow. A damping stop knob (742) is installed on the right end of the swing arm (741). A screw (743) is installed on the left end of the damping stop knob (742). The other end of the screw (743) is installed on the inner wall of the swing arm (741) through a bearing. When the damping stop knob (742) drives the screw (743) to rotate, the screw (743) can be stopped at any time to prevent the screw (743) from rotating freely. A counterweight (744) is slidably connected to the outer wall of the swing arm (741) and engages with the screw (743) thread.

4. The aircraft meal board visual size detection and automatic conveying device according to claim 3, characterized in that, A scale is provided on the front of the swing arm (741).

5. The aircraft meal board visual size detection and automatic conveying device according to claim 4, characterized in that, The limiting component (77) includes a pole (771) installed at the bottom of the inner side of the frame (71). When the pole (771) is inserted into the cavity of the limiting groove (75), it controls the rotation range of the toothed gear (73). A mounting plate (772) is installed on the top front of the pole (771). A first proximity switch (773), a second proximity switch (774) and a third proximity switch (775) electrically connected to the controller (3) are installed on the upper surface of the mounting plate (772) from left to right.

6. The aircraft meal board visual size detection and automatic conveying device according to claim 5, characterized in that, The warping detection mechanism (9) includes a mounting base (91) installed at the front end of the second bracket (8). An LED light (92) is installed on the upper surface of the mounting base (91). Four amplification components (93) are installed on the outer wall of the mounting base (91) in the circumferential direction. The LED light (92) is illuminated by the cooperation of the four amplification components (93).

7. The aircraft meal board visual size detection and automatic conveying device according to claim 6, characterized in that, The mounting base (91) and the platform (78) are on the same vertical line.

8. The aircraft meal board visual size detection and automatic conveying device according to claim 7, characterized in that, The amplification component (93) includes a slotted plate (931) horizontally mounted on the outer wall of the mounting base (91). A counterweight column (932) is slidably connected to the outer side of the slotted plate (931). A first guide wheel (933) is mounted on the outer wall of the counterweight column (932). A linkage rod (934) is mounted on the inner cavity of the slotted plate (931) via a pin. Slides (935) are provided at both ends of the linkage rod (934). The first guide wheel (933) is inserted into the inner cavity of the slide (935). Under the gravity of the counterweight column (932), the first guide wheel (933) is pressed down. As the first guide wheel (933) rolls in the slide (935), it pulls down the linkage rod (934). The inner side of the upper surface of the groove plate (931) is slidably connected to the limit rod (936). The bottom of the outer wall of the limit rod (936) is equipped with a second guide wheel (937) that is inserted into the inner cavity of the slide (935). The top of the limit rod (936) is equipped with an arc-shaped insulator (938). The insulator (938) has a conductor (939) that is electrically connected to the LED lamp (92) embedded inside, and the conductor (939) is connected to a power source.

9. The aircraft meal board visual size detection and automatic conveying device according to claim 8, characterized in that, The rotation center of the linkage rod (934) is close to the counterweight column (932).

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