Tool for measuring gap of main cargo hold door of cargo machine
By designing a combination of fixed and movable components, and using locking bolts to fix the sealing strip to the inner surface of the main cargo door, the problem of difficulty in measuring the gap of the cargo aircraft's main cargo door was solved, enabling accurate gap measurement and sealing verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN AIRCRAFT MAINTENANCE ENG CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-01
AI Technical Summary
Existing technology cannot effectively measure the clearance of the main cargo door of a cargo aircraft, especially the distance between the edge of the sealing strip and the inner surface of the main cargo door, which affects the verification of the sealing system and wear inspection.
A measuring fixture comprising fixed and movable parts was designed. By combining locking bolts, a fixed plate, and a movable plate, the cutting edge of the sealing strip can be fixed within the measuring gap to the inner surface of the main cargo door. After tightening the locking bolts, the specific distance can be measured.
It enables precise measurement of the gap between the sealing strip and the inner surface of the main cargo door, improving the accuracy of the verification and wear inspection of the sealing system.
Smart Images
Figure CN224189141U_ABST
Abstract
Description
A measuring fixture for the clearance of the main cargo door of a cargo aircraft Technical Field
[0001] This utility model relates to the field of aircraft maintenance technology, specifically to a measuring fixture for the clearance of the main cargo door of a cargo aircraft. Background Technology
[0002] The main cargo door is a critical component of the cargo aircraft fuselage, and its sealing performance directly affects flight safety (such as airtightness and waterproofing). Sealing strips are typically installed along the edge of the door. When the door is closed, the "edge" of the sealing strip (i.e., the precisely designed sealing edge) fits tightly against the inner surface of the door, forming a sealing barrier. Measuring the distance between the edge of the sealing strip and the inner surface of the main cargo door is to verify the effectiveness of the sealing system or to check for wear. Because this distance is located in a confined space, ordinary tools cannot directly measure the distance reading. Summary of the Invention
[0003] The purpose of this utility model is to provide a measuring fixture for the gap of the main cargo door of a cargo aircraft, which can measure the distance between the edge of the sealing strip and the inner surface of the main cargo door, and is easy to use.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following solution:
[0005] A measuring fixture for the clearance of a cargo aircraft's main cargo door includes a fixed component and a movable component. The movable component is threaded with a locking bolt. The fixed component has a slot for the locking bolt to pass through. A fixed plate is located at the top of the fixed component, and a movable plate is located at the top of the movable component. The fixed plate and the movable plate are arranged parallel to each other, with a measuring gap between them. Its function is to allow the movable plate to be moved on the fixed plate by pushing it, so that the edge of the sealing strip and the inner surface of the main cargo door are within the measuring gap. When the fixed plate and the movable plate are respectively located at the edge of the sealing strip and the edge of the inner surface of the main cargo door, the locking bolt is tightened to fix the position of the movable plate on the fixed plate. The specific distance of the measuring gap is then measured to obtain the specific value of the target distance.
[0006] Furthermore, the fixed plate is arranged perpendicular to the fixed component, and the movable component is arranged perpendicular to the movable plate.
[0007] Furthermore, the length direction of the strip groove is perpendicular to the movable plate. Its function is that, through the design of the strip groove's length direction, the movable part can move along the length direction of the strip groove when the locking bolt moves within it.
[0008] Furthermore, the end of the fixed plate furthest from the fixed component and the end of the movable plate furthest from the movable component are in the same plane. This allows for direct measurement of the gap using a ruler after the movable plate is fixed.
[0009] Furthermore, the bottom end of the movable component is provided with an adjusting plate parallel to the movable plate, and an adjusting bolt is threaded onto the adjusting plate. The bottom end of the fixed component is provided with a limiting plate parallel to the fixed plate, and a limiting hole is provided on the limiting plate for the adjusting screw to pass through. Its function is that, through the setting of the limiting plate, the adjusting plate, and the adjusting bolt, the size of the measuring gap can be slowly adjusted by turning the adjusting bolt, thereby improving the measurement accuracy.
[0010] Furthermore, the inner diameter of the limiting hole is equal to the outer diameter of the adjusting bolt's screw. Its function is to prevent radial wobble of the locking bolt's screw within the limiting hole by designing the dimensional relationship between the limiting hole and the adjusting bolt's screw.
[0011] Furthermore, the width of the groove is equal to the outer diameter of the locking bolt's thread. Its function is to prevent the locking bolt's thread from wobbling along the width of the groove within the groove through the design of the dimensional relationship between the groove and the locking bolt's thread.
[0012] Furthermore, the outer diameter of the inscribed circle of the head of the locking bolt is larger than the width of the slot. This design, through the dimensional relationship between the head of the locking bolt and the width of the slot, prevents the head of the locking bolt from getting stuck in the slot.
[0013] Furthermore, both the fixed component and the movable component are in the shape of straight plates, and the fixed component and the movable component are arranged in parallel.
[0014] Furthermore, the movable component is threaded with at least two locking bolts, and the straight line formed by all the locking bolts is perpendicular to the movable plate. This design, through the number and spatial arrangement of the locking bolts, prevents the movable component from rotating around a single locking bolt.
[0015] The beneficial effects of this utility model are:
[0016] 1. By setting up fixed parts, movable parts, fixed plates, and movable plates, the movable plate can be pushed to move on the fixed plate, so that the edge of the sealing strip and the inner surface of the main cargo door are within the measuring gap. When the fixed plate and the movable plate are respectively located at the edge of the sealing strip and the edge of the inner surface of the main cargo door, tighten the locking bolts to fix the position of the movable plate on the fixed plate. Then, measure the specific distance of the measuring gap to obtain the specific value of the target distance.
[0017] 2. By designing the position of the slot along its length, the moving part can move along the length of the slot when the locking bolt moves within the slot. Attached Figure Description
[0018] Figure 1 is a three-dimensional structural diagram of Example 1 with the front facing forward;
[0019] Figure 2 is a three-dimensional structural diagram of Example 1 with the back side facing forward.
[0020] Reference numerals in the attached diagram: 1. Fixed component; 2. Moving component; 3. Locking bolt; 4. Strip groove; 5. Fixed plate; 6. Moving plate; 7. Measuring gap; 8. Adjusting plate; 9. Adjusting bolt; 10. Limiting plate. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.
[0022] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] Example 1
[0025] A measuring fixture for measuring the clearance of a cargo aircraft's main cargo door, as shown in Figure 1, includes a fixed component 1 and a movable component 2. A locking bolt 3 is threaded onto the movable component 2, as shown in Figure 2. The fixed component 1 has a slot 4 for the locking bolt 3 to pass through. A fixed plate 5 is located at the top of the fixed component 1, and a movable plate 6 is located at the top of the movable component 2. The fixed plate 5 and the movable plate 6 are arranged parallel to each other, with a measuring gap 7 between them. Both the movable plate 6 and the fixed plate 5 are cuboid in shape. Its function is to allow the movable plate 6 to move on the fixed plate 5 by pushing it, so that the edge of the sealing strip and the inner surface of the main cargo door are within the measuring gap 7. When the fixed plate 5 and the movable plate 6 are respectively located at the edge of the sealing strip and the edge of the inner surface of the main cargo door, the locking bolt 3 is tightened to fix the position of the movable plate 6 on the fixed plate 5. The specific distance of the measuring gap 7 is then measured to obtain the specific value of the target distance.
[0026] Specifically, as shown in Figure 1, the fixed plate 5 is arranged perpendicularly to the fixed member 1, and the movable member 2 is arranged perpendicularly to the movable plate 6.
[0027] Specifically, as shown in Figure 1, the length direction of the strip groove 4 is perpendicular to the movable plate 6. Its function is that, through the positional design of the strip groove 4 along its length, the movable part 2 can move along the length direction of the strip groove 4 when the locking bolt 3 moves within the strip groove 4.
[0028] Specifically, as shown in Figure 1, the end of the fixed plate 5 away from the fixed member 1 and the end of the movable plate 6 away from the movable member 2 are in the same plane. This allows for direct measurement of the measurement gap 7 using a ruler after the movable plate 6 is fixed.
[0029] Specifically, as shown in Figure 1, the bottom end of the movable component 2 is provided with an adjusting plate 8 parallel to the movable plate 6, and an adjusting bolt 9 is threaded onto the adjusting plate 8. The bottom end of the fixed component 1 is provided with a limiting plate 10 parallel to the fixed plate 5, and the limiting plate 10 has a limiting hole for the adjusting screw to pass through. Its function is that, through the setting of the limiting plate 10, the adjusting plate 8, and the adjusting bolt 9, the size of the measuring gap 7 can be slowly adjusted by turning the adjusting bolt 9, thereby improving the measurement accuracy.
[0030] Specifically, as shown in Figure 1, the inner diameter of the limiting hole is equal to the outer diameter of the screw of the adjusting bolt 9. Its function is to prevent radial wobble of the screw of the locking bolt 3 within the limiting hole by designing the dimensional relationship between the limiting hole and the screw of the adjusting bolt 9.
[0031] Specifically, as shown in Figure 1, the width of the slot 4 is equal to the outer diameter of the screw of the locking bolt 3. Its function is to prevent the screw of the locking bolt 3 from wobbling along the width direction of the slot 4 within the slot 4 through the design of the dimensional relationship between the slot 4 and the screw of the locking bolt 3.
[0032] Specifically, as shown in Figure 1, the outer diameter of the inscribed circle of the head of the locking bolt 3 is larger than the width of the slot 4. This design, through the dimensional relationship between the head of the locking bolt 3 and the width of the slot 4, prevents the head of the locking bolt 3 from getting stuck in the slot 4.
[0033] Specifically, as shown in Figure 1, both the fixing member 1 and the movable member 2 are in the shape of straight plates, and the fixing member 1 and the movable member 2 are arranged in parallel.
[0034] Specifically, as shown in Figure 1, the movable part 2 is threaded with at least two locking bolts 3, and the straight line formed by all the locking bolts 3 is perpendicular to the movable plate 6. Its function is to prevent the movable part 2 from rotating around a single locking bolt 3 by designing the number and spatial relationship of the locking bolts 3.
[0035] The working principle of this embodiment is explained as follows: When it is necessary to measure the distance between the edge of the sealing strip and the edge of the main cargo door, first loosen the locking bolt 3 so that the locking bolt 3 can move within the strip groove 4. Align the end face of the fixed plate 5 toward the measuring gap 7 with the edge of the sealing strip, and make the end face of the movable plate 6 toward the measuring gap 7 parallel to the edge of the main cargo door to be measured. Hold the fixed plate 5 with one hand, and while keeping the adjusting bolt 9 pulled so that the adjusting plate 8 is close to the limiting plate 10, slowly turn the adjusting bolt 9 so that the end face of the movable plate 6 toward the measuring gap 7 is flush with the edge of the main cargo door to be measured. Then tighten the locking bolt 3 to fix the movable part 2 on the fixed part 1, that is, fix the distance between the movable plate 6 and the fixed plate 5. Then directly use a ruler to measure the distance between the end face of the fixed plate 5 toward the measuring gap 7 and the end face of the movable plate 6 toward the measuring gap 7 to obtain the distance between the edge of the sealing strip and the edge of the main cargo door.
[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A measuring fixture for the clearance of the main cargo hold door of a cargo aircraft, characterized in that: It includes a fixed part (1) and a movable part (2). The movable part (2) is threaded with a locking bolt (3). The fixed part (1) is provided with a strip groove (4) for the locking bolt (3) to pass through. The top of the fixed part (1) is provided with a fixed plate (5). The top of the movable part (2) is provided with a movable plate (6). The fixed plate (5) and the movable plate (6) are arranged in parallel. A measuring gap (7) is left between the fixed plate (5) and the movable plate (6).
2. The measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The fixed plate (5) is perpendicular to the fixed member (1), and the movable member (2) is perpendicular to the movable plate (6).
3. The measuring fixture for the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The length direction of the strip groove (4) is perpendicular to the movable plate (6).
4. The measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The end of the fixed plate (5) away from the fixed part (1) and the end of the movable plate (6) away from the movable part (2) are in the same plane.
5. A measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The bottom end of the movable part (2) is provided with an adjustment plate (8) parallel to the movable plate (6), and the adjustment plate (8) is threaded with an adjustment bolt (9). The bottom end of the fixed part (1) is provided with a limiting plate (10) parallel to the fixed plate (5), and the limiting plate (10) is provided with a limiting hole for the adjustment screw to pass through.
6. A measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 5, characterized in that: The inner diameter of the limiting hole is equal to the outer diameter of the screw of the adjusting bolt (3).
7. A measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The width of the groove (4) is equal to the outer diameter of the screw of the locking bolt (3).
8. A measuring fixture for the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: The outer diameter of the inscribed circle of the head of the locking bolt (3) is greater than the width of the groove (4).
9. A measuring fixture for measuring the clearance of the main cargo hold door of a cargo aircraft according to claim 1, characterized in that: Both the fixed part (1) and the movable part (2) are straight plates, and the fixed part (1) and the movable part (2) are arranged in parallel.
10. The tooling for measuring the clearance of the main cargo door of a cargo aircraft according to claim 1, characterized in that: The movable part (2) is threaded with at least two locking bolts (3), and the straight line formed by all the locking bolts (3) is perpendicular to the movable plate (6).