Detection tool and detection method for specific area of end face of pin hole of bolt blade

Abstract

The invention belongs to the technical field of engine blade repair, and particularly relates to a measuring tool and a detecting method for a specific area of a bolt blade pin hole end face. The measuring tool comprises a transparent reticle plate, the transparent reticle plate is fixed on the bolt blade through a positioning device, one side face of the transparent reticle plate is in contact with the end face of the blade, and a connecting line of 3 and 9 points and a connecting line of 4 and 8 points are engraved on the side face; the other side face of the transparent reticle plate is attached to the Fresnel lens. The transparent reticle plate distinguishes the risk area and does not shield any position at the same time; and a connecting line of 3 and 9 points and a connecting line of 4 and 8 points are engraved on the side surface in contact with the end surface of the blade, so that the influence of light refraction is avoided, the visual deviation is reduced, the non-engraved surface of the transparent baffle plate is attached to the Fresnel lens, the end surface area of the pin hole is enlarged under the condition that the baffle plate is as thin as possible, and fault inspection is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of engine blade repair, and in particular relates to a measuring tool and a detection method for a specific area of ​​a pin hole end surface of a plug blade. Background Art

[0002] The pinholes of the pinned aluminum alloy rotor blades of a certain engine model have an interference-fit copper sleeve. Over time, the paint coating on the pinhole end surface has peeled off, rendering the protective coating ineffective. Corrosion and subsequent cracking have occurred at the interface between the sleeve and the blade base. High tensile stresses in certain locations, combined with corrosion or cracking, pose a risk of breakage. If a broken blade were to be drawn into the engine, damaging it and potentially rendering the aircraft inoperable, it would pose a significant threat.

[0003] For the division of the main hazardous areas of the pin hole, see Figure 1 , such as the 3-9 o'clock line and the 4-8 o'clock line.

[0004] Usually, visual inspection and empirical judgment are not enough to accurately determine the detection position; using a blade with a marked range line for comparative measurement often results in errors and is inconvenient to use; general baffles will block other positions of the tenon, which is not conducive to fault inspection, and a positioning surface that is applicable to both ends of the lug is required. Summary of the Invention

[0005] The purpose of the present invention is to provide a measuring tool and detection method for a specific area of ​​the end face of the pin hole of a bolt blade, so as to solve the technical problem that the baffle in the detection method in the prior art is not conducive to fault detection and a positioning surface is required that is applicable to both end faces of the lug.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present application discloses a measuring tool for a specific area of ​​the end face of the pin hole of a latch blade, comprising: a transparent scribed plate, the transparent scribed plate being fixed to the latch blade by a positioning device, one side of the transparent scribed plate being in contact with the end face of the blade, the side being engraved with lines connecting points 3 and 9 and lines connecting points 4 and 8; the other side of the transparent scribed plate being bonded to a Fresnel lens.

[0007] Preferably, the transparent scribed plate is made of organic glass.

[0008] Preferably, the positioning device includes a bolt, a nut and an elastic positioning component; the bolt passes through the pin hole and the transparent scale plate, and the transparent scale plate is fixed to the latch blade through the nut. The elastic positioning component is arranged above the transparent scale plate, located between the transparent scale plate and the latch blade, and is used for radial positioning of the transparent scale plate.

[0009] Preferably, the elastic positioning component includes a ball and spring compartment, which is located between the transparent scale plate and the latch blade. Balls and springs are arranged inside the ball and spring compartment from top to bottom, and the spring contacts the upper surface of the transparent scale plate.

[0010] Preferably, the bolt head size of the bolt is the same as the pin hole of the latch blade.

[0011] Preferably, a through hole adapted to the positioning device is provided on the transparent engraved plate, and the transparent engraved plate is coaxially fixed to the pin hole of the latch blade through the positioning device.

[0012] Preferably, the lines connecting 3 and 9 points and the lines connecting 4 and 8 points engraved on the transparent engraved plate are not colored.

[0013] In a second aspect, the present application discloses a method for detecting a specific area of ​​the end face of a pin hole of a bolt blade, which is implemented using any of the above-mentioned measuring tools, comprising: The positioning device fixes the transparent score plate on the latch blade; Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the line connecting the 4 and 8 points through the transparent reticle.

[0014] Preferably, the positioning device includes a bolt, a nut and an elastic positioning component; and includes: The bolt is aligned with the pin hole of the blade and inserted into the pin hole, and cooperates with the nut to fix the transparent scale plate axially. The elastic positioning component cooperates with the edge plate of the blade to radially position the transparent scale plate; Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the line connecting the 4 and 8 points through the transparent reticle.

[0015] Preferably, the positioning device includes a bolt, a nut, a ball and spring chamber, a ball and a spring, and includes: The bolt is aligned with the pin hole of the bolt blade and inserted into the pin hole, and cooperates with the nut to fix the transparent scale plate axially. The ball and spring chamber cooperate with the edge plate of the blade, and the balls and springs arranged inside thereof radially position the transparent scale plate. Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the line connecting the 4 and 8 points through the transparent reticle.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present application discloses a measuring tool for a specific area on the end face of a pin hole of a bolt blade. The transparent scribed plate distinguishes the risk area without blocking any position. The lines connecting points 3 and 9 and 4 and 8 are engraved on the side in contact with the end face of the blade, so that they are not affected by light refraction and visual deviation is reduced. The non-scribed surface of the transparent baffle is fitted with a Fresnel lens, so that the pin hole end face area can be magnified while the baffle is as thin as possible, which is conducive to fault inspection.

[0017] Furthermore, a transparent engraved baffle marks the key inspection positions; elastic positioning components reduce the impact of edge plate tolerances, making positioning tight, greatly reducing tooling shake and improving detection accuracy; marbles can also ensure smooth loading; and the Fresnel lens can amplify fault conditions while keeping the baffle thickness as small as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the bolt blade structure; (a) is a side view; (b) is a main view; Figure 2 Schematic diagram of the assembly of the measuring tool and the latch blade of the present invention; wherein (a) is a stereoscopic diagram from a first perspective; (b) is a stereoscopic diagram from a second perspective; Figure 3 An exploded schematic diagram of the assembly of the measuring tool and the latch blade of the present invention; Figure 4 This is a schematic diagram of the transparent reticle of the present invention attached to the Fresnel lens side; Figure 5 This is a schematic diagram of the contact side between the transparent scribed plate and the blade end surface of the present invention.

[0020] Among them: 1-blade tenon; 2-transparent scale plate; 3-ball and spring chamber; 4-bolt; 5-bolt head; 6-edge plate; 7-ball; 8-spring; 9-nut; 10-scale plate attached to the Fresnel lens side; 11-blade side; 12-blade end face; A-line connecting points 3 and 9; B-line connecting points 4 and 8. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The present invention is described in further detail below with reference to the accompanying drawings: The present invention provides a measuring tool and a detection method for a specific area on the end face of a bolt blade pin hole, which need to solve the following technical problems: 1) The tenon requires a comprehensive inspection, so while distinguishing the risk areas, no position should be obstructed; 2) Ensure accurate division and try to keep the dimension line from tilting or shaking to minimize the error caused by this aspect and ensure accurate position division; 3) Regulations require that both sides of the pin hole be inspected, key inspection areas be marked, and positioning benchmarks be selected, which should be used for measuring both end faces of the pin hole; 4) The marking line should be as little affected by the visual angle as possible; 5) Corrosion faults or cracks are usually not clearly visible and the workpiece will not affect the inspection area.

[0028] This application discloses a measuring tool for a specific area of ​​the end face of a bolt blade pin hole, see Figures 2 to 5 , including: a transparent scale plate 2, the transparent scale plate 2 is fixed on the bolt blade through a positioning device, one side of the transparent scale plate 2 contacts the blade end face 12, and the side is engraved with 3-9 point lines and 4-8 point lines; the other side of the transparent scale plate 2 is fitted with a Fresnel lens. It can not only accurately divide the key inspection positions on the workpiece, but also does not block the inspector's line of sight for surface quality inspection. A transparent scale plate 2 with marked lines is used, and the marking lines are not colored. Accurately set the tool positioning system to reduce the impact of the workpiece's dimensional deviation on the measurement. Analyze the workpiece, the blade's tenon has multiple finished surfaces, and the extremely small hole deviation can be used as a positioning factor. The scale position is set on the surface where the organic glass plate and the workpiece are fitted, so that it is not affected by light refraction and reduces visual deviation. The non-scaled surface of the transparent baffle is fitted with a Fresnel lens, so that the baffle is as thin as possible while magnifying the pin hole end face area, which is beneficial for fault inspection.

[0029] In some embodiments, a measuring tool for a specific area of ​​the pin hole end face of a latch blade includes: a transparent scribed plate 2, the transparent scribed plate 2 being fixed to the latch blade by a positioning device, one side of the transparent scribed plate 2 being in contact with the blade end face 12, and having lines connecting 3 and 9 points and lines connecting 4 and 8 points engraved on the side; and the other side of the transparent scribed plate 2 being fitted with a Fresnel lens. The transparent scribed plate 2 is made of organic glass. The transparent scribed plate distinguishes risk areas while not blocking any position; and the lines connecting 3 and 9 points and lines connecting 4 and 8 points are engraved on the side in contact with the blade end face, so that they are not affected by light refraction, reducing visual deviation. The non-scribed surface of the transparent baffle is fitted with a Fresnel lens, so that the pin hole end face area can be magnified while the baffle is as thin as possible, which is beneficial for fault inspection.

[0030] In some embodiments, a measuring tool for a specific area on the end face of a bolt blade pinhole comprises: a transparent scribed plate 2 secured to the bolt blade via a positioning device. One side of the transparent scribed plate 2, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9 and 4 and 8. A Fresnel lens is attached to the other side of the transparent scribed plate 2. The positioning device comprises a bolt 4, a nut 9, and an elastic positioning component. The bolt 4 passes through the pinhole and the transparent scribed plate 2, and the nut 9 secures the transparent scribed plate 2 to the bolt blade. The elastic positioning component is positioned above the transparent scribed plate 2, between the transparent scribed plate 2 and the bolt blade, and serves to radially position the transparent scribed plate 2. A transparent scribed baffle indicates a key inspection location. The elastic positioning component reduces the impact of edge plate tolerances, ensuring tight positioning, significantly reducing tooling shake, and improving inspection accuracy. The marbles can also be smoothly inserted. The Fresnel lens can amplify fault conditions while minimizing baffle thickness.

[0031] Further preferably, a measuring tool for a specific area on the end face of a bolt blade pinhole comprises: a transparent graticule plate 2 secured to the bolt blade via a positioning device. One side of the transparent graticule plate 2, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9 and 4 and 8; the other side of the transparent graticule plate 2 is fitted with a Fresnel lens. The positioning device comprises a bolt 4, a nut 9, and an elastic positioning component. The bolt 4 passes through the pinhole and the transparent graticule plate 2 and is secured to the bolt blade via the nut 9. The elastic positioning component is positioned above the transparent graticule plate 2, between the transparent graticule plate 2 and the bolt blade, and serves to radially position the transparent graticule plate 2. The elastic positioning component comprises a ball and spring chamber 3, located between the transparent graticule plate 2 and the bolt blade. Balls 7 and springs 8 are arranged from top to bottom within the ball and spring chamber 3, with the springs 8 contacting the upper surface of the transparent graticule plate 2. Other limiting directions are also available. When the tenon side is used as a stop, dimensional deviation or wear at this location can cause the tooling to wobble slightly, significantly amplifying the tilt of the scribed line. By comparison, the flange plate has slightly better parallelism and is parallel to the scribed line, but tolerances may prevent seamless contact, which can affect tooling assembly and disassembly. Furthermore, the flange plates on either side of the pin hole are at different distances from the hole center. Designing for elastic contact with this positioning surface can accommodate slight positional variations.

[0032] In some embodiments, a measuring tool for a specific area on the end face of a latch blade pinhole comprises: a transparent scribed plate 2 secured to the latch blade via a positioning device; one side of the transparent scribed plate 2, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9 and 4 and 8; the other side of the transparent scribed plate 2 is fitted with a Fresnel lens. The positioning device comprises a bolt 4, a nut 9, and an elastic positioning component; the bolt 4 passes through the pinhole and the transparent scribed plate 2, and is secured to the latch blade via the nut 9. The elastic positioning component is positioned above the transparent scribed plate 2, between the transparent scribed plate 2 and the latch blade, and is used to radially position the transparent scribed plate 2. The bolt head 5 of the bolt 4 has the same dimensions as the latch blade pinhole.

[0033] In some embodiments, the transparent scribed plate 2 is provided with a through hole adapted to the positioning device, and the transparent scribed plate 2 is coaxially fixed to the pin hole of the latch blade through the positioning device.

[0034] In some embodiments, the lines connecting points 3 and 9, and 4 and 8, are not colored on the transparent scribed plate 2. The transparent scribed baffle indicates key inspection locations. Elastic positioning components mitigate the impact of edge plate tolerances, ensuring precise positioning and significantly reducing tooling vibration, improving inspection accuracy. The marbles can also be loaded smoothly. The Fresnel lens can amplify fault conditions while minimizing baffle thickness.

[0035] The present application also discloses a method for detecting a specific area of ​​the end face of a bolt blade pin hole, and the measuring tool used is a measuring tool for the specific area of ​​the end face of the bolt blade pin hole, see Figures 2 to 5 The device comprises a transparent scribed plate 2, secured to the latch blade via a positioning device. One side of the plate, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9, and 4 and 8. The other side of the plate is fitted with a Fresnel lens. This allows for accurate identification of key inspection locations on the workpiece while maintaining the inspector's line of sight for surface quality inspection. Inspection methods include: The positioning device fixes the transparent score plate 2 on the latch blade; Use a Fresnel lens to visually inspect through the transparent reticle 2 and check the area between the lines connecting 3 and 9 points and the line connecting 4 and 8 points.

[0036] In some embodiments, the measuring tool used is a measuring tool for a specific area of ​​the end face of the pin hole of the bolt blade, see Figures 2 to 5, comprising: a transparent scribed plate 2, which is fixed to the latch blade via a positioning device. A side of the transparent scribed plate 2, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9 and 4 and 8; the other side of the transparent scribed plate 2 is fitted with a Fresnel lens. The positioning device comprises a bolt 4, a nut 9, and an elastic positioning component; the positioning device comprises a bolt 4, a nut 9, and an elastic positioning component; the bolt 4 passes through the pin hole and the transparent scribed plate 2, and is fixed to the latch blade via the nut 9. The elastic positioning component is disposed above the transparent scribed plate 2, between the transparent scribed plate 2 and the latch blade, and is used to radially position the transparent scribed plate 2. The detection method then comprises: The bolt 4 is aligned with the pin hole of the blade and inserted into the pin hole, and cooperates with the nut 9 to fix the transparent scale plate 2 axially. The elastic positioning component cooperates with the edge plate 6 of the blade to radially position the transparent scale plate 2; Use a Fresnel lens to visually inspect through the transparent reticle 2 and check the area between the lines connecting 3 and 9 points and the line connecting 4 and 8 points.

[0037] In some embodiments, the measuring tool used is a measuring tool for a specific area of ​​the end face of the pin hole of the bolt blade, see Figures 2 to 5 , comprising: a transparent scale plate 2, which is fixed to the latch blade via a positioning device. One side of the transparent scale plate 2, where it contacts the blade end face 12, is engraved with lines connecting points 3 and 9 and 4 and 8; the other side of the transparent scale plate 2 is fitted with a Fresnel lens. The positioning device comprises a bolt 4, a nut 9, and an elastic positioning component. The bolt 4 passes through a pin hole and the transparent scale plate 2, and is secured to the latch blade via the nut 9. The elastic positioning component is disposed above the transparent scale plate 2, between the transparent scale plate 2 and the latch blade, and is used to radially position the transparent scale plate 2. The elastic positioning component comprises a ball and spring chamber 3, which is located between the transparent scale plate 2 and the latch blade. Balls 7 and springs 8 are disposed from top to bottom within the ball and spring chamber 3, and the springs 8 contact the upper surface of the transparent scale plate 2. Other limiting directions can be selected. When the tenon side is used as the limit, dimensional deviation or wear at this location will cause the tooling to swing slightly, and the tilt of the scribe line will be significantly magnified. In comparison, the parallelism of the edge plate is slightly better and parallel to the scribe line direction, but it is affected by tolerances and may not achieve gapless contact, which may affect the assembly and unassembly of the tooling. In addition, the edge plates on both sides of the pin hole are at different distances from the hole center. Designing elastic contact with this positioning surface can adapt to slight position changes. The detection method includes: The bolt 4 is aligned with the pin hole of the latch blade and inserted into the pin hole, and cooperates with the nut 9 to fix the transparent scale plate 2 axially. The ball and spring chamber 3 cooperates with the edge plate 6 of the blade, and the ball 7 and spring 8 arranged inside it radially position the transparent scale plate 2; Use a Fresnel lens to visually inspect through the transparent reticle 2 and check the area between the lines connecting 3 and 9 points and the line connecting 4 and 8 points.

[0038] [Example] The bolt 4 is fixed to the ruled sample by a nut 9. The bolt head 5 has the same diameter as the pin hole of the blade tenon 1. The ruled plate 2 is made of organic glass. In order to adapt to the outer edge plates of different heights on both sides of the blade tenon and to ensure stable fixation, the bolt head 5 and the ball bearing 7 are positioned by relying on the pin hole of the blade tenon 1 and the edge plate 6. The line A connecting points 3 and 9 and the line B connecting points 4 and 8 are engraved on the contact surface with the tenon to reduce the refractive error. A Fresnel lens 10 is attached to the non-contact surface for easy visual inspection.

[0039] When in use, align the end face of the blade pin hole, insert the tooling bolt 4 into the pin hole, look straight at the end face, and check the specified inspection position through the marked template. The following steps are included: 1) Align the bolt of the tooling with the pin hole of the blade tenon and insert it into the pin hole; 2) The inner ball end of the tooling slides onto the inner edge plate, and the tooling is stabilized and fixed; 3) Align the end face to be tested and look directly at the end face to be measured. Through the organic glass, the area between the engraved lines is the risk area that needs to be inspected; 4) Control visual conditions according to corrosion requirements.

[0040] The positive effects of the present invention are: accurate positioning, convenient assembly and disassembly, stable fixation, and the ability to partially magnify the detection area to clearly reflect the fault situation.

[0041] In summary, the present invention belongs to the technical field of engine blade repair, and specifically relates to a measuring tool and detection method for a specific area on the end face of a pin hole of a latch blade. The measuring tool includes: a transparent scaled plate, the transparent scaled plate is fixed to the latch blade by a positioning device, one side of the transparent scaled plate is in contact with the end face of the blade, and the side is engraved with 3-9 point lines and 4-8 point lines; the other side of the transparent scaled plate is fitted with a Fresnel lens. The transparent scaled plate distinguishes the risk areas without blocking any position; and the 3-9 point lines and 4-8 point lines are engraved on the side in contact with the end face of the blade, so that they are not affected by light refraction, reducing visual deviation. The non-scaled surface of the transparent baffle is fitted with a Fresnel lens, so that the pin hole end face area is magnified while the baffle is as thin as possible, which is beneficial for fault inspection.

[0042] The transparent engraved baffle marks the key inspection positions; the elastic positioning components reduce the influence of the edge plate tolerance, making the positioning tight, greatly reducing the shaking of the tooling and improving the detection accuracy; the marbles can also ensure smooth loading; the Fresnel lens can magnify the fault situation while keeping the baffle thickness as small as possible.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A measuring tool for a specific area on the end face of a bolt blade pin hole, characterized in that: include: A transparent scribed plate (2) is fixed on the latch blade via a positioning device, wherein one side of the transparent scribed plate (2) contacts the blade end surface (12), and a line connecting points 3 and 9 and a line connecting points 4 and 8 are engraved on the side; and the other side of the transparent scribed plate (2) is fitted with a Fresnel lens.

2. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 1, characterized in that: The transparent scribed plate (2) is made of organic glass.

3. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 1, characterized in that: The positioning device comprises a bolt (4), a nut (9) and an elastic positioning component; the bolt (4) passes through the pin hole and the transparent engraved plate (2), and the transparent engraved plate (2) is fixed to the latch blade via the nut (9); the elastic positioning component is arranged above the transparent engraved plate (2), located between the transparent engraved plate (2) and the latch blade, and is used for radial positioning of the transparent engraved plate (2).

4. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 3, characterized in that: The elastic positioning component comprises a ball and spring chamber (3), the ball and spring chamber (3) being located between the transparent engraved plate (2) and the latch blade, a ball (7) and a spring (8) being arranged from top to bottom inside the ball and spring chamber (3), and the spring (8) being in contact with the upper surface of the transparent engraved plate (2).

5. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 3, characterized in that: The size of the bolt head (5) of the bolt (4) is the same as the bolt blade pin hole.

6. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 1, characterized in that: The transparent engraved plate (2) is provided with a through hole adapted to the positioning device, and the transparent engraved plate (2) is coaxially fixed to the pin hole of the latch blade via the positioning device.

7. A measuring tool for a specific area on the end face of a bolt blade pin hole according to claim 1, characterized in that: The lines connecting the 3 and 9 points and the lines connecting the 4 and 8 points engraved on the transparent engraved plate (2) are not colored.

8. A method for detecting a specific area on the end face of a bolt blade pin hole, characterized in that: The method is implemented by using the measuring tool according to any one of claims 1 to 7, comprising: The positioning device fixes the transparent engraved plate (2) on the latch blade; Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the lines connecting the 4 and 8 points through the transparent scribed plate (2).

9. A method for detecting a specific area on the end face of a bolt blade pin hole according to claim 8, characterized in that: The positioning device comprises a bolt (4), a nut (9) and an elastic positioning component; and comprises: The bolt (4) is aligned with the pin hole of the blade and inserted into the pin hole, and cooperates with the nut (9) to fix the transparent scale plate (2) axially, and the elastic positioning component cooperates with the edge plate (6) of the blade to radially position the transparent scale plate (2); Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the lines connecting the 4 and 8 points through the transparent scribed plate (2).

10. The method for detecting a specific area on the end face of a bolt blade pin hole according to claim 8, characterized in that: The positioning device comprises a bolt (4), a nut (9), a ball and spring chamber (3), a ball (7) and a spring (8), and comprises: The bolt (4) is aligned with the pin hole of the latch blade and inserted into the pin hole, and cooperates with the nut (9) to fix the transparent scale plate (2) axially. The ball and spring chamber (3) cooperates with the edge plate (6) of the blade, and the ball (7) and spring (8) arranged therein radially position the transparent scale plate (2); Use a Fresnel lens to visually inspect the area between the lines connecting the 3 and 9 points and the lines connecting the 4 and 8 points through the transparent scribed plate (2).

Images