Specialized gauges for small-sized grooves

Abstract

This utility model discloses a special inspection tool for small-sized grooves, relating to the field of aero-engine component processing and inspection technology. It includes a protective shell, with a sleeve rotatably connected inside the shell. An extension shaft is connected to the end of the sleeve away from the protective shell, and a baffle is connected to the end of the extension shaft away from the sleeve. A micrometer screw is rotatably connected inside the sleeve, with one end of the micrometer screw passing through the extension shaft and the baffle and extending to the outside of the baffle. This design allows for flexible operation in confined spaces by inserting the compact baffle, extension shaft, and micrometer screw into narrow grooves. The double ratchet and spring mechanism prevents the micrometer screw from reversing or overshooting, resulting in small transmission clearance and significantly improved accuracy compared to calipers. It ensures the baffle fits snugly against the groove side. Furthermore, the knob and ratchet transmission reduces inspection time, simplifies operation and maintenance, and allows for dust and impact protection during storage. Routine cleaning is all that's needed, reducing management costs and extending service life.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine component processing and inspection technology, and in particular to a special inspection tool for small-sized grooves. Background Technology

[0002] Aero engines, as the pinnacle of highly complex and precise thermodynamic machinery in the history of human industrial civilization, are the heart of an aircraft. They are not only the core power source that enables aircraft to defy gravity and achieve altitudes of tens of thousands of meters, but also the key technology engine that drives the continuous iteration and breakthroughs of the global aviation industry. Looking back on a century of aviation history, from the transoceanic flights of propeller planes to the mass travel of jet airliners, and then to the air and space deterrence of stealth fighters and the strategic delivery of large transport aircraft, every milestone in the industry has been inseparable from the breakthrough technological evolution of aero engines in terms of thrust, efficiency, reliability, and environmental protection. It can be said that the technological level of aero engines directly defines the depth of a country's aviation industry development and the strategic breadth of its aerospace exploration.

[0003] However, without specialized gauges for small-sized grooves, the following difficulties arise during the machining of aero-engine parts:

[0004] The feasibility of inspection is insufficient. The groove size is usually small, and commonly used inspection tools cannot be inserted due to size limitations. Even if some tools can achieve the inspection, the parts need to be disassembled. However, after disassembly, the accuracy will be lost and it is impossible to realign. Measurement can only be performed in situ on the machine tool. In addition, the inspection accuracy is not up to standard. When the upper clamp of the vernier caliper is inserted into the groove for measurement, the measurement error is greater than the actual inspection accuracy requirement, which cannot meet the needs of accurate inspection of groove size at all. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a special inspection tool for small-width grooves, which can inspect smaller grooves and solves the problem of not being able to inspect such narrow grooves.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a special inspection tool for small-sized groove widths, including a protective shell, a sleeve rotatably connected inside the protective shell, an extension shaft connected to the end of the sleeve away from the protective shell, a baffle connected to the end of the extension shaft away from the sleeve, a micrometer screw rotatably connected inside the sleeve, and one end of the micrometer screw passing through the extension shaft and the baffle in sequence and extending to the outside of the baffle.

[0007] The protruding shaft is provided with a locking assembly inside, the locking assembly including a threaded hole opened inside the protruding shaft.

[0008] The inner wall of the threaded hole is threaded with a lead screw, and a second knob is connected to the top of the lead screw.

[0009] The outer wall of the protective shell is connected to a connecting pipe, and the other end of the micrometer screw passes through the connecting pipe and is connected to a first ratchet.

[0010] The connecting tube is equipped with a second ratchet inside, which meshes with the first ratchet. A spring is connected to the second ratchet, and the other end of the spring is connected to a first knob.

[0011] The sleeve has a main scale, and the protective shell has an annular scale, with the main scale and the annular scale being compatible.

[0012] The outer wall of the protective shell is fitted with an anti-slip sleeve.

[0013] This utility model provides a special inspection tool for small-sized grooves, which has the following advantages compared with the prior art:

[0014] Beneficial effects:

[0015] This small-sized groove width inspection tool is designed to easily insert into narrow grooves via a baffle, extension shaft, and micrometer screw. It allows for flexible operation in confined spaces without disassembling parts, overcoming limitations in inaccessible working conditions. The combined transmission structure of double ratchet and spring effectively prevents micrometer screw reversal and overshoot, resulting in minimal transmission clearance and significantly improved accuracy compared to calipers. It ensures precise contact between the micrometer screw and the groove side, consistently meeting inspection accuracy requirements. Furthermore, the tool is optimized for efficiency and operation. The precise transmission via the knob and ratchet reduces the time required to inspect a single groove width. The design, with the left hand holding the protective shell and the right hand rotating the first knob for operation, is simple and easy to learn, requiring no complex coordination. Maintenance is also extremely simple; when not in use, it can be directly stored away to prevent dust, metal shavings, and impacts, requiring only routine cleaning. This reduces tool management costs and effectively extends its service life. Attached Figure Description

[0016] Figure 1 A schematic diagram of the internal structure of a special inspection tool for small-sized grooves;

[0017] Figure 2 A three-dimensional structural diagram of a special inspection tool for small-sized grooves;

[0018] Figure 3 A three-dimensional structural diagram of the locking component in a special inspection tool for small-sized grooves;

[0019] Figure 4 This is a schematic diagram of the internal structure of the first knob in a special gauge for small-sized grooves.

[0020] In the diagram: 1. Protective shell; 2. Sleeve; 3. Extending shaft; 4. Baffle; 5. First knob; 6. Micrometer screw; 7. Locking assembly; 701. Threaded hole; 702. Lead screw; 703. Second knob; 8. Connecting tube; 9. First ratchet; 10. Second ratchet; 11. Spring; 12. Main scale; 13. Annular scale; 14. Anti-slip sleeve. Detailed Implementation

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

[0022] Please see Figure 1-4 This utility model provides a technical solution for a special inspection tool with small-sized groove width: it includes a protective shell 1, which serves as the core support component of the inspection tool. On the one hand, it provides a stable installation space for the internal components, preventing the internal precision structure from being contaminated by external collisions, dust, and iron filings; on the other hand, it serves as a force-bearing carrier for the operator to hold, and together with the anti-slip sleeve 14, it achieves overall tool positioning to ensure no deviation during inspection. A sleeve 2 is rotatably connected inside the protective shell 1, and the sleeve 2 is the transmission and guiding core of the micrometer screw 6. It has a thread inside that is adapted to the micrometer screw 6, which can convert the rotational motion of the micrometer screw 6 into axial linear motion. The movement ensures accurate extension and retraction of the screw. Meanwhile, the main scale 12 on the sleeve 2 is the basic scale carrier for width measurement, providing a core reference for reading. The end of the sleeve 2 away from the protective shell 1 is connected to the extension shaft 3, and the end of the extension shaft 3 away from the sleeve 2 is connected to the baffle 4. The baffle 4 needs to fit against the inner side of the groove during testing, providing a fixed reference end for the extension and retraction adjustment of the micrometer screw 6, so that the extension length of the micrometer screw 6 directly corresponds to the groove width, avoiding measurement errors caused by unclear reference. The micrometer screw 6 is rotatably connected inside the sleeve 2. One end of the micrometer screw 6 passes through the extension shaft 3 and the baffle 4 in sequence and extends to the outside of the baffle 4.

[0023] The extension shaft 3 is equipped with a locking assembly 7, which includes a threaded hole 701 inside the extension shaft 3. A lead screw 702 is threadedly connected to the inner wall of the threaded hole 701. A second knob 703 is connected to the top of the lead screw 702. When the operator rotates the second knob 703, the lead screw 702 moves axially with the guidance of the threaded hole 701. Its end can press against the micrometer screw 6 and generate friction, fixing the micrometer screw 6 to the extension shaft 3. After the micrometer screw 6 is precisely fitted with the inner wall of the groove, it can effectively prevent the micrometer screw from being displaced by external force, ensuring the stability of the measured dimension during the reading process, and further ensuring the accuracy and reliability of small-size groove width detection.

[0024] The outer wall of the protective shell 1 is connected to a connecting tube 8. The other end of the micrometer screw 6 passes through the connecting tube 8 and is connected to a first ratchet 9. A second ratchet 10 is provided inside the connecting tube 8. The first ratchet 9 and the second ratchet 10 mesh. A spring 11 is connected to the second ratchet 10. The other end of the spring 11 is connected to a first knob 5.

[0025] The sleeve 2 has a main scale 12, and the protective shell 1 has an annular scale 13. The main scale 12 and the annular scale 13 are matched. The outer wall of the protective shell 1 is fitted with an anti-slip sleeve 14. The anti-slip texture on the surface of the anti-slip sleeve 14 can greatly increase the friction between the hand and the protective shell 1, preventing the tool from slipping or shifting due to sweaty, oily, or uneven force when the operator holds the tool. At the same time, it can buffer the direct contact between the hand and the metal protective shell 1, improve the grip comfort, and allow the operator to stably control the tool for a long time. This provides a guarantee for the position fixation and accurate adjustment during the testing process, and indirectly reduces the measurement error caused by unstable grip.

[0026] The working principle of this utility model is as follows: During use, the operator holds the protective shell 1 with the anti-slip sleeve 14 on its left hand to stabilize the tool, aligns the protruding shaft 3 with the groove to be inspected, and makes the baffle 4 fit against the inner surface of the groove; the right hand rotates the first knob 5, which drives the second ratchet 10 inside the connecting tube 8 to rotate via the spring 11. The first ratchet 9, which meshes with the second ratchet 10, rotates accordingly, thereby driving the micrometer screw 6 to rotate within the sleeve 2 and extend and retract axially until the end of the micrometer screw 6 fits against the other side of the groove. The wall, with double ratchet and spring 11, can prevent reverse rotation and overshoot; then rotate the second knob 703 of the locking assembly 7 to lock the micrometer screw 6 in the threaded hole 701, thus preventing reading deviation; by reading the corresponding values ​​of the main scale 12 on the sleeve 2 and the annular scale 13 on the protective shell 1, the accurate width is obtained by superimposing them; after the test is completed, release the locking assembly 7, rotate the knob in the opposite direction to retract the micrometer screw 6, and store the tool. The protective shell 1 can effectively isolate dust and impact.

[0027] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.

Claims

1. A small size groove width special purpose gauge characterized by, The device includes a protective shell (1), a sleeve (2) is rotatably connected inside the protective shell (1), an extension shaft (3) is connected to one end of the sleeve (2) away from the protective shell (1), a baffle (4) is connected to one end of the extension shaft (3) away from the sleeve (2), a micrometer screw (6) is rotatably connected inside the sleeve (2), and one end of the micrometer screw (6) passes through the extension shaft (3) and the baffle (4) in sequence and extends to the outside of the baffle (4).

2. The small size groove width dedicated gauge according to claim 1, wherein The extension shaft (3) is provided with a locking assembly (7), which includes a threaded hole (701) inside the extension shaft (3).

3. The small size groove width dedicated gauge according to claim 2, wherein The inner wall of the threaded hole (701) is threaded with a lead screw (702), and the top end of the lead screw (702) is connected to a second knob (703).

4. The small size groove width dedicated gauge according to claim 1, wherein The outer wall of the protective shell (1) is connected to a connecting pipe (8), and the other end of the micrometer screw (6) passes through the connecting pipe (8) and is connected to a first ratchet (9).

5. The small size groove width dedicated gauge according to claim 4, wherein The connecting tube (8) is provided with a second ratchet (10), the first ratchet (9) meshes with the second ratchet (10), the second ratchet (10) is connected to a spring (11), and the other end of the spring (11) is connected to a first knob (5).

6. The small size groove width dedicated gauge according to claim 1, wherein The sleeve (2) has a main scale (12) and the protective shell (1) has an annular scale (13), and the main scale (12) and the annular scale (13) are compatible.

7. The small size groove width dedicated gauge according to claim 1, wherein The outer wall of the protective shell (1) is fitted with an anti-slip sleeve (14).

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