A probe device for measuring the torque arm hole of the inner tube of A320 main landing gear

Abstract

This utility model discloses a probe device for measuring the torque arm hole of the inner cylinder of an A320 main landing gear. It includes a connecting tool holder detachably mounted on a CNC horizontal boring and milling machine head. An extension assembly and a probe assembly are mounted on the connecting tool holder. The maximum outer diameter of both the extension assembly and the probe assembly is smaller than the outer diameter of the CNC horizontal boring and milling machine head spindle. Furthermore, the combined length of the extension assembly and the probe assembly is equal to or greater than the distance between the end face of the inner cylinder wheel axle and the end face of the torque arm hole on the same side. The extension assembly includes a tool holder and a probe connecting rod. The outer diameter of the probe connecting rod is smaller than the outer diameter of the tool holder. The maximum outer diameter of the probe connecting rod and the probe assembly is smaller than the distance between the center of the torque arm hole and the outer ring of the wheel axle flange. This utility model adds a variable-diameter extension assembly to the original probe, avoiding interference with the wheel axle flange. It can quickly, safely, and accurately detect the form and position tolerances of deformed parts, saving maintenance time.

Description

Technical Field

[0001] This utility model belongs to the field of landing gear testing technology, specifically a probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear. Background Technology

[0002] The A320 main landing gear is a critical component of the aircraft, used to withstand the loads during takeoff, landing, and parking. During use, the connection between the inner and outer cylinders of the main landing gear (torsion arm bore) is subjected to significant loads and is also affected by weather conditions, making the inner wall and end face of the torque arm bore prone to corrosion.

[0003] like Figure 6 As shown, the A320 main landing gear inner cylinder 20 has a T-shaped structure with symmetrical axle 23 on both sides of its bottom. A torque arm hole 22 is located in the protruding part in the middle, and a protruding axle flange 21 is provided on the axle 23. If corrosion occurs on the inner wall or end face of the torque arm hole 22, the corroded portion needs to be bored or milled to meet the dimensional and geometric tolerance requirements specified in the CMM (Component Maintenance Manual), such as perpendicularity and parallelism. After machining, the geometric tolerances of the torque arm hole need to be inspected.

[0004] Currently, the main method for inspecting the landing gear inner cylinder is to use a standard probe mounted on a CNC horizontal boring and milling machine. However, in actual use, it has been found that due to the presence of a wheel axle flange larger than the outer diameter of the inner cylinder wheel axle itself between the inner cylinder wheel axle end face and the torque arm hole, and the relatively long distance between the inner cylinder wheel axle end face and the torque arm hole end face (generally 600mm), as well as the relatively wide outer diameter of the probe's working shank (generally greater than 69mm), interference occurs between the probe and its working shank and the wheel axle flange during the measurement process using the CNC horizontal boring and milling machine. This affects the detection effect of form and position tolerances and may lead to serious problems such as machine collisions during inspection. Therefore, the current work of measuring the form and position tolerances of the torque arm hole can only be outsourced, which affects the overall inspection efficiency and cost. In view of this, a probe device for measuring the torque arm hole of the A320 main landing gear inner cylinder is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A probe device for measuring the torque arm hole of the inner cylinder of an A320 main landing gear is characterized by: a connecting tool holder detachably mounted on the head of a CNC horizontal boring and milling machine; an extension assembly and a probe assembly sequentially arranged along the coaxial direction on the connecting tool holder; the maximum outer diameter of both the extension assembly and the probe assembly is smaller than the outer diameter of the spindle of the CNC horizontal boring and milling machine head; and the combined length of the extension assembly and the probe assembly is equal to or greater than the distance between the end face of the inner cylinder wheel axle of the main landing gear and the end face of the torque arm hole on the same side; the extension assembly includes a connected tool bar and a probe connecting rod; the outer diameter of the probe connecting rod is smaller than the outer diameter of the tool bar; and the maximum outer diameter of the probe connecting rod and the probe assembly is smaller than the distance between the center of the torque arm hole and the outer ring of the wheel axle flange, so as to avoid interference with the wheel axle flange during the testing process.

[0008] In a preferred embodiment, a positioning plug is formed by a central protrusion at one end of the probe body that is connected to the probe connecting rod, and a positioning slot is formed by an inward recess at one end of the probe connecting rod that is connected to the probe body. The positioning plug is inserted into the positioning slot, and the positioning plug and the positioning slot are interference fit. At least two first hexagon socket head cap screws are evenly provided around the positioning slot to lock the positioning plug.

[0009] In a preferred embodiment, a boss is formed at the center of the end of the probe connecting rod that is connected to the tool bar, and a groove is formed at the end of the tool bar that is connected to the probe connecting rod. The boss is inserted into the groove, and the boss and the groove are interference fit. At least two second hexagon socket bolts are evenly provided around the groove to lock the boss.

[0010] In a preferred embodiment, a mounting platform is formed at the center of the end of the tool holder that is connected to the connecting tool handle, and a mounting groove is formed at the end of the connecting tool handle that is connected to the tool holder. The mounting platform is inserted into the mounting groove, and the mounting platform and the mounting groove are interference fit. At least two fastening grooves are evenly distributed on the outer circumferential surface of the mounting platform. A fastening screw is threadedly connected to the connecting tool handle at the position corresponding to the mounting groove, and the inner end of the fastening screw is inserted into the fastening groove.

[0011] In a preferred embodiment, the end of the tool holder with a mounting platform protrudes to form at least one positioning rod, and the end of the tool handle with a mounting groove is recessed inward to form a rod groove, which is inserted into the rod groove.

[0012] In a preferred embodiment, the probe assembly includes a probe body, a probe rod is provided at one end of the probe body along its axis, and two perpendicular probes are provided at the end of the probe rod, one of which is arranged coaxially with the probe rod.

[0013] In a preferred embodiment, the probe body has a battery compartment for assembling a battery, and a battery cover is detachably mounted on the battery compartment.

[0014] In a preferred embodiment, the connecting tool holder is a BT50 tool holder, and a BT50 pull stud is provided at the end of the connecting tool holder that connects to the CNC horizontal boring and milling machine head.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model incorporates a variable-diameter extension assembly between the connecting tool holder and the probe assembly. After boring or milling, the probe assembly can be mounted on a CNC horizontal boring and milling machine. The CNC horizontal boring and milling machine then moves the probe assembly to detect the form and position tolerances of the torque arm hole in the inner cylinder of the main landing gear. Because the extension assembly is a variable-diameter structure, interference with the wheel axle flange can be avoided during detection. This allows for quick and accurate detection of the form and position tolerances of deformed parts, saving maintenance time and costs, and enhancing the company's competitiveness in maintenance services.

[0017] 2. The extension component, probe component and connecting handle of this utility model are spliced ​​and combined structures. If any part is damaged, it can be replaced individually, which can save the overall maintenance and replacement costs. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0019] Figure 2 This is a front view of the overall structure of this utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0021] Figure 4 This is a partial three-dimensional structural diagram of the tool holder and tool shank after they have been separated in this utility model;

[0022] Figure 5 This is a three-dimensional structural diagram of the tool holder in this utility model;

[0023] Figure 6 This is a three-dimensional structural diagram of the inner cylinder of the main landing gear of an aircraft in the prior art;

[0024] Figure 7 This is a partial side view of the inner cylinder of an aircraft main landing gear in the prior art.

[0025] The markings in the diagram are: 1-Probe, 2-Probe rod, 3-Probe body, 31-Connecting plug, 4-Battery cover, 5-Probe connecting rod, 51-Boss, 52-Positioning slot, 6-Second hex bolt, 7-Tool holder, 71-Mounting platform, 72-Positioning rod, 73-Groove, 74-Fastening groove, 8-Fastening screw, 9-Connecting tool holder, 91-Mounting groove, 92-Rod groove, 10-BT50 pull stud, 20-Inner cylinder, 21-Wheel axle flange, 22-Torque arm hole, 23-Wheel axle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] Reference Figure 1-5 The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear in this embodiment includes a connecting tool holder 9, an extension assembly, and a probe assembly that are detachably mounted on the head of a CNC horizontal boring and milling machine (not shown in the figure).

[0028] The extension assembly and the probe assembly are sequentially mounted coaxially on the connecting tool holder 9, connecting the tool holder 9 and the probe assembly via the extension assembly. The maximum outer diameter of both the extension assembly and the probe assembly is smaller than the outer diameter of the CNC horizontal boring and milling machine head spindle, and the combined length of the extension assembly and the probe assembly is equal to or greater than the distance L1 between the end face of the inner cylinder wheel axle 23 of the main landing gear and the end face of the torque arm hole 22 on the same side. The extension assembly includes a connected tool holder 7 and a probe connecting rod 5. The outer diameter of the probe connecting rod 5 is smaller than the outer diameter of the tool holder 7, and the maximum outer diameter of the probe connecting rod 5 and the probe assembly is smaller than the distance L2 between the center of the torque arm hole 22 and the outer ring of the wheel axle flange 21, to avoid interference with the wheel axle flange 21 during the inspection process. In this embodiment, a non-standard extension component is designed between the connecting tool holder 9 and the probe assembly. After boring or milling, the probe device can be assembled onto a CNC horizontal boring and milling machine. The CNC horizontal boring and milling machine is used to drive the probe assembly to move for inspection. Since the extension component is a variable diameter structure, the dimensions of the extension component are designed to avoid interference with the wheel and axle flange 21 when inspecting the torque arm hole 22. It can quickly and accurately detect the form and position tolerances of deformed parts, which can significantly improve processing efficiency, reduce costs, improve product quality, promote intelligent maintenance of machinery, enhance the company's maintenance business competitiveness, and save on outsourced inspection costs.

[0029] In this embodiment, the probe assembly includes a probe body 3. A probe rod 2 is provided at one end of the probe body 3 along its axial direction. Two perpendicular probes 1 are provided at the end of the probe rod 2. One probe 1 is arranged coaxially with the probe rod 2. The two perpendicular probes 1 can realize, for example, the form and position tolerances of the hole end face, the hole wall face, and different positions. When inspecting the inner wall face of the torque arm hole 22, it can be inspected by the vertical probe 1.

[0030] In this embodiment, the probe body 3 has a battery compartment for assembling batteries, and a battery cover 4 is detachably installed on the battery compartment. The battery in the battery compartment can provide power for the operation of the probe body 3. The probe assembly is a commonly used device. How the probe assembly measures the size and position of the workpiece will not be described in detail here.

[0031] In this embodiment, a positioning plug 31 protrudes from the center of the other end of the probe body 3, and a positioning slot 52 is formed by the inward recess of one end of the probe connecting rod 5. The positioning plug 31 is inserted into the positioning slot 52, and the positioning plug 31 and the positioning slot 52 are interference-fitted. At least two first hexagon socket head cap screws 12 are threadedly connected to the corresponding positioning slot 52 of the probe connecting rod 5. The first hexagon socket head cap screws 12 are evenly distributed around the center, and the inner end of the first hexagon socket head cap screws 12 abuts against the positioning plug 31, thereby locking the probe connecting rod 5 and the positioning plug 31 together through the first hexagon socket head cap screws 12. Through the interference fit of the positioning plug 31 and the positioning slot 52, the position of the probe body 3 installed on the probe connecting rod 5 can be limited, which can ensure the concentricity and connection accuracy between the probe assembly and the probe connecting rod 5, and can ensure the accuracy of subsequent detection. Preferably, there are two first hexagon socket head cap screws 12. In other embodiments, there may be three or more, which will not be specifically described here.

[0032] In this embodiment, a boss 51 protrudes from the center of the other end of the probe connecting rod 5, and a groove 73 is formed by the inward indentation of one end of the tool rod 7. The boss 51 is inserted into the groove 73, and the boss 51 and the groove 73 are in an interference fit. At least two second hexagon socket head cap screws 6 are threaded onto the tool rod 7 at the position corresponding to the groove 73. The second hexagon socket head cap screws 6 are evenly distributed around the center, and the inner end of the second hexagon socket head cap screws 6 abuts against the boss 51, thereby locking the tool rod 7 and the boss 51 together through the second hexagon socket head cap screws 6. The interference fit between the boss 51 and the groove 73 can help limit the position of the probe connecting rod 5 installed on the tool rod 7, and can ensure the concentricity between the tool rod 7 and the probe connecting rod 5, which can ensure the accuracy of subsequent detection. Preferably, there are two second hexagon socket head cap screws 6. In other embodiments, there may be three or more second hexagon socket head cap screws 6, which will not be specifically described here.

[0033] In this embodiment, a mounting platform 71 is formed by a central protrusion at the other end of the tool holder 7, and a mounting groove 91 is formed by an inward recess at one end of the connecting tool handle 9. The mounting platform 71 is inserted into the mounting groove 91, and the mounting platform 71 and the mounting groove 91 are in an interference fit. At least two fastening grooves 74 are evenly distributed on the outer circumferential surface of the mounting platform 71. A fastening screw 8 is threadedly connected to the connecting tool handle 9 at the position corresponding to the mounting groove 91. The inner end of the fastening screw 8 is inserted into the fastening groove 74, thereby locking the mounting platform 71 in the mounting groove 91. At least one positioning rod 72 protrudes from one end of the tool holder 7, which has a mounting platform 71. A rod groove 92 is formed by the inward recess of the end of the tool handle 9, which has a mounting groove 91. When the tool handle 9 is assembled with the tool holder 7, the positioning rod 72 is inserted into the rod groove 92, achieving initial assembly between the tool holder 7 and the tool handle 9. After assembly, a fastening screw 8 is screwed inward until it is tightly fitted into the mounting groove 91, thus completing the assembly operation between the tool holder 7 and the tool handle 9. Preferably, there are two fastening screws 8 and mounting grooves 91. In other embodiments, there may be one or more, which will not be specifically described here.

[0034] In this embodiment, the connecting tool holder 9 is a BT50 tool holder, and the other end of the connecting tool holder 9 is provided with a BT50 pull stud 10. The connecting tool holder 9 can be combined with the CNC horizontal boring and milling machine head through the BT50 pull stud 10. The probe assembly can be directly driven to move for form and position tolerance detection through the program designed by the CNC horizontal boring and milling machine (not described in detail here), making the operation more convenient.

[0035] It should be mentioned that the extension assembly, probe assembly, and connecting tool holder 9 are assembled structures, and any damaged part can be replaced individually, which can save on overall maintenance and replacement costs.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear, characterized in that: The device includes a connecting tool holder that can be detachably mounted on the head of a CNC horizontal boring and milling machine. An extension assembly and a probe assembly are sequentially arranged coaxially on the connecting tool holder. The maximum outer diameter of both the extension assembly and the probe assembly is smaller than the outer diameter of the spindle of the CNC horizontal boring and milling machine head. Furthermore, the combined length of the extension assembly and the probe assembly is equal to or greater than the distance between the end face of the inner cylinder wheel axle of the main landing gear and the end face of the torque arm hole on the same side. The extension assembly includes a connected tool bar and a probe connecting rod. The outer diameter of the probe connecting rod is smaller than the outer diameter of the tool bar. The maximum outer diameter of the probe connecting rod and the probe assembly is smaller than the distance between the center of the torque arm hole and the outer ring of the wheel axle flange, to avoid interference with the wheel axle flange during the inspection process.

2. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 1, characterized in that: The probe assembly has a positioning plug protruding from the center of one end connected to the probe connecting rod, and a positioning slot is formed by the inward recess of the other end of the probe connecting rod connected to the probe assembly. The positioning plug is inserted into the positioning slot, and the positioning plug and the positioning slot are interference fit. At least two first hexagon socket head cap screws are evenly arranged around the positioning slot to lock the positioning plug.

3. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 2, characterized in that: The probe connecting rod has a protruding boss at the center of the end connected to the tool bar, and the end of the tool bar connected to the probe connecting rod has an inward recessed groove. The boss is inserted into the groove, and the boss and the groove are interference fit. At least two second hexagon socket head cap screws are evenly arranged around the groove to lock the boss.

4. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 3, characterized in that: The end of the tool holder that connects to the connecting handle has a centrally protruding mounting platform. The end of the connecting handle that connects to the tool holder has an inwardly recessed mounting groove. The mounting platform is inserted into the mounting groove, and the mounting platform and the mounting groove are interference fit. At least two fastening grooves are evenly distributed on the outer circumference of the mounting platform. A fastening screw is threaded onto the connecting handle at the position corresponding to the mounting groove, and the inner end of the fastening screw is inserted into the fastening groove.

5. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 4, characterized in that: The end of the tool holder with a mounting platform protrudes to form at least one positioning rod, and the end of the connecting handle with a mounting groove is recessed inward to form a rod groove, which is inserted into the rod groove.

6. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 1, characterized in that: The probe assembly includes a probe body, a probe rod is provided at one end of the probe body along its axis, and two perpendicular probes are provided at the end of the probe rod, one of which is arranged coaxially with the probe rod.

7. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 6, characterized in that: The probe body has a battery compartment for assembling batteries, and a battery cover is detachably installed on the battery compartment.

8. The probe device for measuring the torque arm hole of the inner cylinder of the A320 main landing gear according to claim 1, characterized in that: The connecting tool holder is a BT50 tool holder, and a BT50 pull stud is provided at the end of the connecting tool holder that connects to the CNC horizontal boring and milling machine head.

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