Device and method for measuring reversing distance during training and assessment
By using laser rangefinder and speaker devices in reverse distance measurement, the problems of unfast and accuracy of traditional measurement methods are solved, accurate measurement and real-time broadcast of reverse distance are achieved, and the efficiency and scientificity of training and assessment are improved.
Patent Information
- Application Number
- CN202510135842.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-05-13
AI Technical Summary
In the prior art, the measurement of reverse distances has problems such as unfast measurement, irregular standards, and the results are greatly affected by human factors and difficult to ensure accuracy, resulting in poor training and assessment results.
The device including a laser rangefinder, speaker and universal adjustment rod is adopted to accurately measure through the laser rangefinder. The speakers broadcast measurement data in real time, and the universal adjustment rod is convenient for adjusting the measurement angle.
Accurate measurement of reversing distance is achieved, the influence of human factors is reduced, the measurement efficiency and accuracy is improved, and the scientificity and fairness of training and assessment are ensured.
Smart Images
Figure CN119986677A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of aerospace product reception and transportation, and in particular to a device and method for measuring a reverse distance during training and assessment. Background Art
[0002] In the mission of receiving and transferring aerospace products, accurate measurement of the vehicle's reversing distance is crucial. On the one hand, it is necessary to place triangular wood in advance and leave a safe distance to prevent the vehicle from colliding with the aircraft due to speed and brake loss of control during reversing, causing accidents and equipment damage; on the other hand, accurate measurement of the reversing distance is the key to judging whether the vehicle meets the product unloading requirements after reversing and parking. For example, when unloading aerospace products such as spacecraft and satellites, it is required that the center line of the vehicle loaded with the product is aligned with the center line of the aircraft after the vehicle is reversed and parked, so as to ensure that the product is placed in the center when unloading, and to avoid scratches and collisions with the aircraft cabin by product packaging boxes that are too wide or too high.
[0003] However, at present, there are many problems in measuring the reversing distance when the maintenance personnel are conducting simulated reversing training and assessment. Traditional measurement methods, such as manual tape measures and ground marking rulers, are not only inefficient, but also have non-standard measurement standards. The measurement results are easily affected by human factors and the accuracy is difficult to guarantee. These problems directly lead to poor training and assessment results, and cannot effectively improve the driver's reversing technology, posing a hidden danger to the safe and accurate execution of the road transportation mission of picking up and transferring aerospace products.
[0004] Therefore, it is necessary to provide a device and method for measuring the reverse distance during training and assessment to solve the above technical problems. Summary of the invention
[0005] The present invention provides a device and method for measuring the reverse distance during training and assessment, which solves the problems of manual measurement, such as slow measurement, non-standardized standards, results greatly affected by human factors and difficulty in ensuring accuracy.
[0006] In order to solve the above technical problems, the present invention provides a device for measuring the reverse distance during training and assessment, comprising: Base; A limit assembly, the limit assembly is arranged at the bottom of the base, the limit assembly comprises a rubber sleeve and a magnet, the magnet is arranged on the inner side of the rubber sleeve, and the top of the rubber sleeve is fixedly installed on the bottom of the base; A universal adjustment rod, wherein the universal adjustment rod is arranged on the top of the base; A measuring component, the measuring component is arranged at the top of the universal adjustment rod, and the measuring component includes a shell, a control mainboard, a speaker, a window, and a laser rangefinder. The control mainboard is fixedly installed at the bottom of the inner side of the shell, the speakers are respectively fixedly installed at the two ends of the top of the inner side of the shell, the window is respectively fixedly installed at the two ends of the top of the shell, and the laser rangefinder is fixedly installed at the top of the shell; A control component is arranged at the bottom of the shell.
[0007] Preferably, handles are fixedly mounted on both ends of the top of the base, a connecting seat is provided between the two handles, and the bottom of the connecting seat is fixedly mounted on the top of the base.
[0008] Preferably, threaded rods are fixedly installed at both ends of the universal adjustment rod, the outer side surface of one threaded rod is threadedly connected to a mounting seat, the mounting seat is fixedly installed at the bottom of the shell, and the other threaded rod is threadedly connected to the inside of the connecting seat.
[0009] Preferably, the control assembly includes a movable plate, a display screen, control buttons, a pulling plate, a metal plate and a limit block, the display screen and the control buttons are fixedly mounted on the inner side of the movable plate, the limit block is fixedly mounted on one end of the bottom of the movable plate, the metal plate is fixedly mounted on one end of the movable plate, and the pulling plate is fixedly mounted on the other end of the movable plate.
[0010] Preferably, a protective frame is fixedly mounted on the bottom of the shell, a magnetic plate is fixedly mounted on one end of the inner side of the protective frame, and a limiting groove is provided at the bottom of the inner side of the protective frame.
[0011] Preferably, the movable plate is slidably connected to the inner side surface of the protective frame, the limiting block is slidably connected to the inner side surface of the limiting groove, and the metal plate and the magnetic plate are arranged opposite to each other.
[0012] Preferably, the device for measuring the reversing distance during training and assessment also includes a support seat, an adjusting rod is slidably connected inside the support seat, a mounting frame is provided on the top of the adjusting rod, a mounting groove is provided on the top of the mounting frame, the adsorption component is provided on the inner side surface of the mounting groove, and rotating grooves are provided on three sides of the support seat, a rotating block is rotatably connected to the inner side surface of the rotating groove, and a support rod is fixedly installed on the bottom of the rotating block.
[0013] Preferably, a mounting screw is fixedly mounted on the top of the adjusting rod, a threaded sleeve is threadedly connected to the outer side surface of the mounting screw, and the top of the threaded sleeve is fixedly mounted on the bottom of the mounting frame.
[0014] Preferably, a locking screw is connected to the internal thread of one side of the support seat, and one end of the locking screw abuts against the side surface of the adjusting rod.
[0015] In order to solve the above problems, the present invention also provides a method for the training and assessment of the above-mentioned device for measuring the reversing distance during training and assessment, comprising the following steps: S1. Preparation: Check the device for measuring the reverse distance during training and assessment, ensure that the measuring components, limit components, universal adjustment rod and other components are intact and have sufficient power, and carry the device to the simulated aircraft training and assessment site; S2. Installation: Get close to the training or assessment vehicle and attach the limit assembly to a suitable position on the vehicle. Generally, select a position at the rear of the vehicle that is easy to measure and does not affect the normal driving and operation of the vehicle. Install the measuring assembly on the base through the universal adjustment rod and adjust the angle of the measuring assembly so that it can accurately measure the distance between the highest point of the vehicle's rear and the highest point of the simulated aircraft's tail. S3, start measuring: the driver starts the vehicle and starts reversing, the safety officer turns on the measuring component, the measuring component measures the reversing distance between the vehicle and the simulated aircraft in real time, and broadcasts the measured data through the loudspeaker; S4. Obtaining data: The loudspeaker broadcasts the measurement data in real time, and the commander and safety officer can hear it clearly. Pay special attention to the front-to-back distance between the highest point of the vehicle's tail and the highest point of the simulated aircraft's tail, ensuring that it is greater than 5 cm and less than 30 cm; at the same time, pay attention to the left-right distance between the highest point of the vehicle's tail and the highest point of the simulated aircraft's tail, ensuring that it is no more than 5 cm, and the left-right deviation between the center of the vehicle and the center of the aircraft is no more than 5 cm; S5. Judgment and feedback: Based on the measurement data, determine whether the vehicle meets the product unloading requirements after reverse parking, that is, whether the center line of the vehicle is aligned with the center line of the aircraft. If it meets the requirements, the driver can stop the car to complete the operation; if not, the safety officer will promptly instruct the driver to adjust the vehicle position until it meets the standards; S6. End of work: After the measurement is completed, close the measuring assembly, then disassemble the universal adjustment rod, base and measuring assembly, and properly store the device for next use.
[0016] Compared with the related art, the device and method for measuring the reverse distance during training and assessment provided by the present invention have the following beneficial effects: The present invention provides a device and method for measuring the reversing distance during training and assessment. By adopting a laser rangefinder for measurement, compared with the traditional measurement method of manual tape measure and ground marking ruler, the error caused by human factors is effectively avoided, and the accurate measurement of the reversing distance can be achieved. The measurement result is more reliable, and accurate data support is provided for driver training and assessment. The measurement data is transmitted in real time through a loudspeaker, and manual reading and recording are not required, which greatly saves measurement time and improves the efficiency of training and assessment. Moreover, the unified and standardized reversing distance measurement method and standard solve the problem of non-standardization of traditional measurement standards, make training and assessment more scientific and fair, and help to improve the overall reversing technical level of drivers. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic structural diagram of a first embodiment of a device for measuring a reverse distance during training and assessment provided by the present invention; Figure 2 for Figure 1 Another perspective structural schematic diagram shown; Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the measuring component shown; Figure 4 for Figure 1 The schematic diagram of the cross-sectional structure of the protection frame and the control assembly shown; Figure 5 for Figure 1 The schematic diagram of the cross-sectional structure of the limiting component shown; Figure 6 for Figure 4 An enlarged schematic diagram of part A is shown; Figure 7 A schematic structural diagram of a second embodiment of a device for measuring a reverse distance during training and assessment provided by the present invention; Figure 8 for Figure 7 An enlarged schematic diagram of part B is shown; Fig. 9 for Figure 7 An enlarged schematic diagram of part C is shown.
[0018] Numbers in the figure: 1. base, 11. handle, 12. connecting seat, 2. limit assembly, 21. rubber sleeve, 22. magnet, 3. universal adjustment rod, 31. threaded rod, 32. mounting seat, 4. measuring assembly, 41. shell, 42. control main board, 43. speaker, 44. window, 45. laser rangefinder, 5. protective frame, 51. limit slot, 52. magnetic plate, 6. control assembly, 61. moving plate, 62. display screen, 63. control button, 64. pulling plate, 65. metal plate, 66. limit block, 7. support seat, 71. rotating slot, 72. rotating block, 73. support rod, 74. locking screw, 75. adjusting rod, 76. mounting screw, 77. threaded sleeve, 78. mounting frame, 79. mounting slot. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes. First embodiment
[0020] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 A schematic structural diagram of a first embodiment of a device for measuring a reverse distance during training and assessment provided by the present invention; Figure 2 for Figure 1 Another perspective structural schematic diagram shown; Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the measuring component shown; Figure 4 for Figure 1 The schematic diagram of the cross-sectional structure of the protection frame and the control assembly shown; Figure 5 for Figure 1 The schematic diagram of the cross-sectional structure of the limiting component shown; Figure 6 for Figure 4 An enlarged schematic diagram of part A is shown. A device and method for measuring the reverse distance during training and assessment, comprising: Base 1; A limit assembly 2, the limit assembly 2 is arranged at the bottom of the base 1, the limit assembly 2 comprises a rubber sleeve 21 and a magnet 22, the magnet 22 is arranged on the inner side of the rubber sleeve 21, and the top of the rubber sleeve 21 is fixedly installed on the bottom of the base 1; A universal adjustment rod 3, wherein the universal adjustment rod 3 is arranged on the top of the base 1; A measuring component 4, which is arranged at the top of the universal adjustment rod 3, and includes a shell 41, a control mainboard 42, a speaker 43, a window 44, and a laser rangefinder 45. The control mainboard 42 is fixedly mounted on the bottom of the inner side of the shell 41, the speakers 43 are respectively fixedly mounted on the two ends of the top of the inner side of the shell 41, the window 44 is respectively fixedly mounted on the two ends of the top of the shell 41, and the laser rangefinder 45 is fixedly mounted on the top of the shell 41; The control component 6 is disposed at the bottom of the shell 41 .
[0021] Handles 11 are fixedly mounted on both ends of the top of the base 1 , a connecting seat 12 is provided between the two handles 11 , and the bottom of the connecting seat 12 is fixedly mounted on the top of the base 1 .
[0022] Threaded rods 31 are fixedly installed at both ends of the universal adjustment rod 3. The outer side surface of one threaded rod 31 is threadedly connected to a mounting seat 32. The mounting seat 32 is fixedly installed at the bottom of the shell 41. The other threaded rod 31 is threadedly connected to the inside of the connecting seat 12.
[0023] The control assembly 6 includes a moving plate 61, a display screen 62, a control button 63, a pulling plate 64, a metal plate 65 and a limit block 66. The display screen 62 and the control button 63 are fixedly installed on the inner side of the moving plate 61, the limit block 66 is fixedly installed on one end of the bottom of the moving plate 61, the metal plate 65 is fixedly installed on one end of the moving plate 61, and the pulling plate 64 is fixedly installed on the other end of the moving plate 61.
[0024] A protection frame 5 is fixedly mounted on the bottom of the housing 1 , a magnetic plate 52 is fixedly mounted on one end of the inner side of the protection frame 5 , and a limiting groove 51 is provided at the bottom of the inner side of the protection frame 5 .
[0025] The movable plate 61 is slidably connected to the inner side surface of the protection frame 5 , the limiting block 66 is slidably connected to the inner side surface of the limiting groove 51 , and the metal plate 65 and the magnetic plate 52 are arranged opposite to each other.
[0026] When in use, the laser rangefinder 45 can measure the distance in real time, and then transmit the measured data to the control mainboard 42, and then the control mainboard 42 transmits the signal to the inside of the speaker 43 again, and the speaker 43 can broadcast the measured data in real time; When the display screen 62 is in use, it can display the data measured by the laser rangefinder 45 so that the staff can check it later; By wrapping the outer side of the magnet 22 with a rubber sleeve 21, it can play a protective role when in use, preventing the magnet 22 from contacting the measurement or aircraft, causing wear and tear on the vehicle and aircraft; During installation, the threaded rods 31 at both ends of the universal adjustment rod 3 are respectively threadedly connected to the inner side surfaces of the connecting seat 12 and the mounting seat 32, so as to play the role of installing the measuring component 4. During subsequent use, the user can adjust the angle of the measuring component 4 through the universal adjustment rod 3. The universal adjustment rod 3 adopts a flexible metal support, which is similar to the mobile phone holder in the prior art. After the use of the display screen 62 is finished, the user can push the pulling plate 64 to make the movable plate 61 slide to the inner side of the protective frame 5. At this time, the limit block 66 slides on the inner side of the limit groove 51, thereby limiting the movable plate 61. When the movable plate 61 moves to the inner side of the protective frame 5, the metal plate 65 and the magnetic plate 52 can be magnetically attracted, thereby limiting the movable plate 61 and preventing the movable plate 61 from slipping out.
[0027] At the same time, by accurately measuring the reversing distance, we ensure that the vehicle meets the product unloading requirements after reversing and parking, effectively avoiding accidents such as vehicle collisions with aircraft and product packaging boxes scratching or colliding with aircraft cabins, thereby ensuring the safe implementation of aerospace product pick-up and transfer road transportation tasks.
[0028] Compared with the related art, the device and method for measuring the reverse distance during training and assessment provided by the present invention have the following beneficial effects: By using the laser rangefinder 45 for measurement, compared with the traditional manual tape measure and ground marking ruler measurement method, the error caused by human factors is effectively avoided, and the accurate measurement of the reversing distance can be achieved. The measurement result is more reliable, providing accurate data support for driver training and assessment; the measurement data is transmitted in real time through the speaker 43, without the need for manual reading and recording, which greatly saves measurement time and improves the efficiency of training and assessment; and the unified and standardized reversing distance measurement method and standard solves the problem of non-standardization of traditional measurement standards, making training and assessment more scientific and fair, and helping to improve the overall reversing technology level of the driver. Second embodiment
[0029] Please refer to Figure 7 , Figure 8 and Fig. 9Based on the device and method for measuring the reverse distance during training and assessment provided by the first embodiment of the present application, the second embodiment of the present application proposes another device and method for measuring the reverse distance during training and assessment. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.
[0030] Specifically, the difference between the device and method for measuring the reversing distance during training and assessment provided in the second embodiment of the present application is that the device and method for measuring the reversing distance during training and assessment also include a support seat 7, and the support seat 7 is internally slidably connected with an adjusting rod 75, and the top of the adjusting rod 75 is provided with a mounting frame 78, and the top of the mounting frame 78 is provided with a mounting groove 79, and the adsorption component 2 is arranged on the inner side of the mounting groove 79, and the support seat 7 is provided with a rotating groove 71 on three sides, and the inner side of the rotating groove 71 is rotatably connected with a rotating block 72, and the bottom of the rotating block 72 is fixedly installed with a support rod 73.
[0031] A mounting screw 76 is fixedly mounted on the top of the adjusting rod 75 , and a threaded sleeve 77 is threadedly connected to the outer side of the mounting screw 76 . The top of the threaded sleeve 77 is fixedly mounted on the bottom of the mounting frame 78 .
[0032] A locking screw 74 is connected to the inner thread of one side of the support seat 7 , and one end of the locking screw 74 abuts against the side surface of the adjusting rod 75 .
[0033] The working principle of the device and method for measuring the reverse distance during training and assessment provided by the present invention is as follows: When setting up the measuring component 4, first rotate the three support rods 73 to spread the three support rods 73 to support the support seat 7. Then the user can place the adsorption component 2 on the inner side of the mounting groove 79, and then move the mounting frame 78 upward, thereby driving the adjustment rod 75 to move upward, so that the adjustment rod 75 is threadedly connected inside the support seat 7, and then adjust the height of the measuring component 4. After adjusting to the appropriate height, the user can rotate the locking screw 74 so that one end of the locking screw 74 abuts against the side of the adjusting rod 75, thereby limiting the adjustment rod 75 and thus limiting the height of the measuring component 4.
[0034] Compared with the related art, the device and method for measuring the reverse distance during training and assessment provided by the present invention have the following beneficial effects: Through the cooperation of structures such as the support seat 7, the rotating groove 71, the rotating block 72, the support rod 73, the adjusting rod 75, the mounting screw 76, the threaded sleeve 77, the mounting frame 78 and the mounting groove 79, it is convenient for the user to set up the measuring component 4 and adjust the height of the measuring component 4 when in use.
[0035] In order to solve the above problems, the present invention also provides a method for the training and assessment of the above-mentioned device for measuring the reversing distance during training and assessment, comprising the following steps: S1. Preparation: Check the device for measuring the reverse distance during training and assessment, ensure that the measuring component 4, the limit component 2 and the universal adjustment rod 3 and other components are intact and have sufficient power, and carry the device to the simulated aircraft training and assessment site; S2. Installation of the device: Get close to the training or assessment vehicle, adsorb the limit assembly 2 on a suitable position of the vehicle, generally select a position at the rear of the vehicle that is easy to measure and does not affect the normal driving and operation of the vehicle, install the measuring assembly 4 on the base 1 through the universal adjustment rod 3, and adjust the angle of the measuring assembly 4 so that it can accurately measure the distance between the highest point of the rear of the vehicle and the highest point of the tail of the simulated aircraft; S3, start measuring: the driver starts the vehicle to reverse, the safety officer turns on the measuring component 4, the measuring component 4 measures the reverse distance between the vehicle and the simulated aircraft in real time, and broadcasts the measured data through the speaker 43; S4. Obtaining data: The loudspeaker 43 broadcasts the measurement data in real time, and the commander and the safety officer can hear it clearly. Pay special attention to the front-to-back distance between the highest point of the vehicle tail and the highest point of the simulated aircraft tail, and ensure that it is greater than 5 cm and less than 30 cm; at the same time, pay attention to the left-right distance between the highest point of the vehicle tail and the highest point of the simulated aircraft tail, and ensure that it is no more than 5 cm, and the left-right deviation between the center of the vehicle and the center of the aircraft is no more than 5 cm; S5. Judgment and feedback: Based on the measurement data, determine whether the vehicle meets the product unloading requirements after reverse parking, that is, whether the center line of the vehicle is aligned with the center line of the aircraft. If it meets the requirements, the driver can stop the car to complete the operation; if not, the safety officer will promptly instruct the driver to adjust the vehicle position until it meets the standards; S6, end of work: After the measurement is completed, close the measuring assembly 4, then disassemble the universal adjustment rod 3, the base 1 and the measuring assembly 4, and properly store the device for next use.
[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A device for measuring the reverse distance during training and assessment, characterized in that: include: Base; A limit assembly, the limit assembly is arranged at the bottom of the base, the limit assembly comprises a rubber sleeve and a magnet, the magnet is arranged on the inner side of the rubber sleeve, and the top of the rubber sleeve is fixedly installed on the bottom of the base; A universal adjustment rod, wherein the universal adjustment rod is arranged on the top of the base; A measuring component, the measuring component is arranged at the top of the universal adjustment rod, and the measuring component includes a shell, a control mainboard, a speaker, a window, and a laser rangefinder. The control mainboard is fixedly installed at the bottom of the inner side of the shell, the speakers are respectively fixedly installed at the two ends of the top of the inner side of the shell, the window is respectively fixedly installed at the two ends of the top of the shell, and the laser rangefinder is fixedly installed at the top of the shell; A control component is arranged at the bottom of the shell.
2. The device for measuring the reverse distance during training and assessment according to claim 1, characterized in that: Handles are fixedly mounted on both ends of the top of the base, a connecting seat is arranged between the two handles, and the bottom of the connecting seat is fixedly mounted on the top of the base.
3. The device for measuring the reverse distance during training and assessment according to claim 2, characterized in that: Threaded rods are fixedly installed at both ends of the universal adjustment rod, the outer side surface of one of the threaded rods is threadedly connected to a mounting seat, the mounting seat is fixedly installed at the bottom of the shell, and the other threaded rod is threadedly connected to the inside of the connecting seat.
4. The device for measuring the reverse distance during training and assessment according to claim 3, characterized in that: The control assembly includes a moving plate, a display screen, control buttons, a pulling plate, a metal plate and a limit block. The display screen and the control buttons are fixedly installed on the inner side of the moving plate, the limit block is fixedly installed on one end of the bottom of the moving plate, the metal plate is fixedly installed on one end of the moving plate, and the pulling plate is fixedly installed on the other end of the moving plate.
5. The device for measuring the reverse distance during training and assessment according to claim 4, characterized in that: A protection frame is fixedly mounted on the bottom of the shell, a magnetic plate is fixedly mounted on one end of the inner side of the protection frame, and a limiting groove is provided at the bottom of the inner side of the protection frame.
6. The device for measuring the reverse distance during training and assessment according to claim 5, characterized in that: The movable plate is slidably connected to the inner side surface of the protective frame, the limiting block is slidably connected to the inner side surface of the limiting groove, and the metal plate and the magnetic plate are arranged opposite to each other.
7. The device for measuring the reverse distance during training and assessment according to claim 1, characterized in that: It also includes a support seat, which is slidably connected to an adjustment rod inside the support seat, a mounting frame is provided on the top of the adjustment rod, a mounting groove is provided on the top of the mounting frame, the adsorption component is provided on the inner side of the mounting groove, and rotation grooves are provided on three sides of the support seat, the inner side of the rotation groove is rotatably connected to a rotation block, and a support rod is fixedly installed on the bottom of the rotation block.
8. The device for measuring the reverse distance during training and assessment according to claim 7, characterized in that: A mounting screw is fixedly mounted on the top of the adjusting rod, a threaded sleeve is threadedly connected to the outer side of the mounting screw, and the top of the threaded sleeve is fixedly mounted on the bottom of the mounting frame.
9. The device for measuring the reverse distance during training and assessment according to claim 8, characterized in that: A locking screw is connected to the internal thread of one side of the support seat, and one end of the locking screw abuts against the side surface of the adjusting rod.
10. A method for measuring the reversing distance during training and assessment of the device for measuring the reversing distance during training and assessment of claims 1-9, characterized in that: The following steps are involved: S1. Preparation: Check the device for measuring the reverse distance during training and assessment, ensure that the measuring components, limit components, universal adjustment rod and other components are intact and have sufficient power, and carry the device to the simulated aircraft training and assessment site; S2. Installation: Get close to the training or assessment vehicle and attach the limit assembly to a suitable position on the vehicle. Generally, select a position at the rear of the vehicle that is easy to measure and does not affect the normal driving and operation of the vehicle. Install the measuring assembly on the base through the universal adjustment rod and adjust the angle of the measuring assembly so that it can accurately measure the distance between the highest point of the vehicle's rear and the highest point of the simulated aircraft's tail. S3, start measuring: the driver starts the vehicle and starts reversing, the safety officer turns on the measuring component, the measuring component measures the reversing distance between the vehicle and the simulated aircraft in real time, and broadcasts the measured data through the loudspeaker; S4. Obtaining data: The loudspeaker broadcasts the measurement data in real time, and the commander and safety officer can hear it clearly. Pay special attention to the front-to-back distance between the highest point of the vehicle's tail and the highest point of the simulated aircraft's tail, ensuring that it is greater than 5 cm and less than 30 cm; at the same time, pay attention to the left-right distance between the highest point of the vehicle's tail and the highest point of the simulated aircraft's tail, ensuring that it is no more than 5 cm, and the left-right deviation between the center of the vehicle and the center of the aircraft is no more than 5 cm; S5. Judgment and feedback: Based on the measurement data, determine whether the vehicle meets the product unloading requirements after reverse parking, that is, whether the center line of the vehicle is aligned with the center line of the aircraft. If it meets the requirements, the driver can stop the car to complete the operation; if not, the safety officer will promptly instruct the driver to adjust the vehicle position until it meets the standards; S6. End of work: After the measurement is completed, close the measuring assembly, then disassemble the universal adjustment rod, base and measuring assembly, and properly store the device for next use.