Auxiliary scribing device and method for bent section of bent component

Abstract

The invention discloses an auxiliary scribing device and method for a bent section of a bent component, and relates to the technical field of pipe bending angle measurement, the device comprises a base, two groups of vernier calipers, an angle ruler, a flexible auxiliary scribing mechanism, a support I for mounting the vernier calipers, and a support II for placing the bent component; the two groups of vernier calipers have the same specification, are vertically intersected in a horizontal plane and are mounted on the support I; the bevel protractor comprises an angle main graduated scale and an angle vernier scale; the support II comprises a bent component molded surface supporting block and a positioning rod; the flexible auxiliary lineation mechanism is connected with the bevel protractor and used for being attached to the outer surface of the bent component to assist in completing lineation operation, meanwhile, the bent component bent section lineation method based on the device is provided, and the technical problem of precise lineation of the bent section of an aviation pipeline welding guide pipe is solved.

Description

Technical Field

[0001] This invention relates to the field of pipe bending angle measurement technology, specifically to an auxiliary marking device and method for the bending section of a bending component. Background Technology

[0002] In the aerospace field, aviation piping systems contain a large number of welded conduits. Due to their complex routing, dense branch distribution, and stringent assembly precision requirements, these welded conduits must be fitted with specialized repair and welding fixtures during repair and welding. For some conduits requiring butt welding at bends, the bends must first be precisely repaired. A common butt welding method involves cutting one end of the conduit with a small bend radius along the bend radius and then welding it to the straight section of the conduit at the other end.

[0003] Currently, in the process of cutting and repairing curved sections of conduits, operators need to first allow for machining margins before cutting, and then repeatedly adjust and repair using specialized repair and welding fixtures to meet assembly requirements. However, although existing specialized repair fixtures have the advantage of simple structure, the following problems still exist in practical applications: Firstly, it requires a very high level of skill from the operators. Even a slight misoperation during the operation can lead to the failure of the guide tube cutting. Moreover, the overall repair process is time-consuming, which seriously affects production efficiency. Secondly, the inability to accurately mark the cutting aids at the curved section of the conduit makes it difficult for the bending angle at the cut end to match the design model after cutting, which cannot guarantee the accuracy of subsequent welding and assembly, and may affect the overall performance and operational safety of the aviation pipeline system.

[0004] In the existing technology, some angle or arc measurement tools have emerged, but none of them can meet the actual needs of precise scribing of the curved section of the duct. For example, CN212340147U discloses a device for measuring the arc of aircraft duct manufacturing. This device projects the aircraft duct onto a scale plate through an illumination device, and obtains the arc data by combining the angle displayed by the indexing device and the projection value measured by the scale plate, providing accurate data support for duct manufacturing. However, the purpose of this technical solution is to use projection technology to measure the arc of the duct, and it does not involve the design of any auxiliary devices related to the precise scribing of the curved section of the duct. CN219675072U discloses a portable angle measuring device, the application of which is limited to construction. In the construction field, the installation angle inspection and acceptance of formwork and temporary structures is not mentioned, but no auxiliary technical solutions are mentioned for the precise marking of curved sections of curved components; CN219736149U discloses a digital angle ruler, mainly used to measure the perpendicularity of the longitudinal and transverse edges of the corners inside and outside buildings, but it also does not involve the design of a related auxiliary device for the precise marking of curved sections of curved components; CN116817718A discloses an angle measuring device and its usage method for planar design, which can realize the measurement and drawing of line segments of different angles, but this technology is applicable to planar design scenarios and does not mention an auxiliary device that can be used for the precise cutting and marking of curved sections of curved components, and cannot adapt to the surface marking requirements of curved sections of aviation ducts.

[0005] Therefore, existing technologies cannot solve the technical problem of accurately marking the curved sections of welding conduits in aviation pipelines, and cannot meet the requirements of conduit repair accuracy, efficiency and versatility in actual production. Developing an auxiliary device for accurately marking the curved sections of conduits with strong adaptability and easy operation has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary scribing device and method for the bending section of a curved component, which solves the technical problem of accurate scribing of the bending section of the welded conduit in aviation pipelines. At the same time, the device has the characteristics of good versatility, low manufacturing cost and convenient operation.

[0007] This invention is achieved through the following technical solution: A scribing device for the curved section of a curved component includes a base, two sets of vernier calipers, an angle ruler, a flexible auxiliary scribing mechanism, a support I for mounting the vernier calipers, and a support II for placing the curved component. The base is used to mount and fix the angle gauge, support I, and support II; The two sets of vernier calipers are identical in size and are arranged perpendicularly to each other in the horizontal plane. The two sets of vernier calipers are installed and fixed on the corresponding support I. Support I is used to realize the installation and positioning of the vernier calipers. The vernier calipers include a main scale and a vernier scale. An angle ruler includes a main angle scale and an angle vernier scale; The support II includes a bending member profile support block and a positioning rod. The positioning rod is mounted on a vernier caliper and is used to limit the position of the support II. The flexible auxiliary marking mechanism includes a support rod, a fixing block, a horizontal slider, a vertical slider, a marking auxiliary block, and a locking component. The support rod is mounted on the angle ruler via the fixing block. The horizontal slider includes a horizontal guide block and a vertical guide block. After the position of the angle vernier caliper is fixed, the horizontal slider, the vertical slider, and the marking auxiliary block are moved until the marking auxiliary block is in contact with the outer surface of the curved component. The locking component is then tightened to achieve the positioning and fixing of each component. The flexible auxiliary scribing mechanism is connected to the angle ruler and is used to fit the outer surface of the curved component to assist in completing the scribing operation.

[0008] Furthermore, the vernier scale includes a graduated upstream scale, an ungraded upstream scale, and a downstream scale, with the graduated upstream scale and the ungraded upstream scale respectively fixed to the downstream scale by fasteners.

[0009] Furthermore, the angle vernier scale includes an upstream scale and a downstream scale, which are mounted on the main angle scale by fasteners; Once the angle vernier scale has moved to the designated position, tighten the fasteners to fix the position of the angle vernier scale.

[0010] Furthermore, the angle ruler also includes locking blocks and shims, which are used to help fix the main angle scale and the vernier angle scale.

[0011] Furthermore, the bending member profile support block is a replaceable structural component, and the profile of the bending member profile support block is one of the following: circular, rectangular, I-shaped, or T-shaped.

[0012] Furthermore, the support I has threaded holes at both ends, and is fixedly connected to the base by screws. The two ends of the two sets of vernier calipers are fixed to the corresponding support I by screws.

[0013] Furthermore, a rectangular hole is provided on the vernier scale, and a positioning rod is installed in the rectangular hole, with the bottom of the positioning rod contacting the base.

[0014] A method for scribing the curved section of a curved member, based on the aforementioned auxiliary scribing device for the curved section of a curved member, includes the following steps: S1. Place the base on a horizontal working surface. First, install and fix support I on the base. Then, fix the two vernier calipers of the same specification to the corresponding support I with fasteners so that the two sets of vernier calipers are arranged perpendicularly to each other in the horizontal plane. S2. Based on the cross-sectional shape of the bending component to be scribed, select a bending component profile support block that matches the profile. Assemble the positioning rod of support II onto the vernier caliper to achieve the limiting and fixing of support I. Then place the bending component to be scribed onto the bending component profile support block to complete the positioning and support of the bending component. S3. After installing the angle ruler in place, move the angle vernier caliper to the preset scribing angle position, and tighten the fasteners on the angle ruler to fix the position of the angle vernier caliper. S4. Install the support rod on the angle ruler by fixing the block, move the horizontal slider consisting of the horizontal guide block and the vertical guide block, as well as the vertical slider and the scribing auxiliary block, until the scribing auxiliary block is completely in contact with the outer surface of the bending component to be scribed, tighten the fasteners of the flexible auxiliary scribing mechanism, and complete the positioning and fixing of each component. S5. Using the scribing auxiliary block that fits the outer surface of the curved component as a guide, use the scribing tool to scribing along the curved section of the curved component and complete the target scribing under the guidance of the scribing auxiliary block.

[0015] Furthermore, in step S2, the vernier scales of the two vernier calipers are adjusted to the scale positions that match the preset bending radius R of the bending component, and then tightened and locked by the corresponding fastening components of each vernier caliper to keep the position of the vernier scale fixed.

[0016] Furthermore, in step S5, a scribing / marker is used to mark the outer surface of the curved member along the scribing aid block.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: I. In this invention, an auxiliary scribing device for the curved section of a curved component is proposed. The upper and lower scales of the vernier caliper can be moved and fixed at any value, which can accurately adapt to the auxiliary scribing needs of curved components with different bending radii and has a wide range of applications.

[0018] II. This invention proposes an auxiliary marking device for the curved section of a curved component. The support II used to place the curved component has a profile that can match different cross-sectional shapes such as circular, rectangular, I-shaped, and T-shaped, as well as different specifications of the same type of cross-section. In application, the marking requirements of curved components with various cross-sections can be met by changing the support, demonstrating extremely high adaptability.

[0019] Third, this invention proposes an auxiliary scribing device for the curved section of a curved component. With the help of a movable angle ruler, it can achieve precise scribing at any position within the range of 0° to 90° of the curved section of the curved component, with an accuracy of up to 2′, effectively ensuring the accuracy of scribing.

[0020] Fourth, this invention proposes an auxiliary scribing device for the curved section of a curved component. By moving the flexible auxiliary scribing mechanism and replacing scribing auxiliary blocks of different shapes, it can accurately scribble on curved components with different cross-sectional shapes and arbitrary bending radii, with excellent flexible adjustment capability.

[0021] Fifth, this invention proposes a method for scribing the curved section of a curved component, which is based on an auxiliary scribing device for the curved section of a curved component. It provides a brand-new solution for scribing the curved section of a three-dimensional curved component, and has the core advantages of accurate scribing and convenient operation, making it highly practical. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the auxiliary marking device for the curved section of a curved component.

[0023] Figure 2 This is a structural diagram of a vernier caliper.

[0024] Figure 3 This is a schematic diagram of the support I for mounting the vernier caliper.

[0025] Figure 4 This is a schematic diagram of the angle ruler.

[0026] Figure 5 This is a structural diagram of the fixing block and gasket.

[0027] Figure 6 This is a schematic diagram of the flexible auxiliary marking mechanism.

[0028] Figure 7 This is a schematic diagram of the assembly of the angle ruler and the flexible scribing auxiliary structure.

[0029] Figure 8 This is a structural schematic diagram of support II for installing bending components.

[0030] Figure 9 This is a structural diagram of the base.

[0031] Figure 10 These are schematic diagrams of different types of bending members: a is a circular bending member, b is a rectangular bending member, and c is an I-shaped bending member.

[0032] Figure 11 This is a schematic diagram of auxiliary marking for the bending section of a rectangular cross-section bending member.

[0033] Among them, 1. Vernier caliper; 2. Support I; 3. Angle scale; 4. Flexible auxiliary scribing mechanism; 5. Support II; 6. Base; 7. Bending component; 11. Main scale; 12. Vernier scale; 13. Fixing screw I; 21. Threaded hole I; 31. Angle main scale; 32. Angle vernier scale; 33. Locking block; 34. Washer; 35. Fixing screw II; 41. Support rod; 42. Fixing block; 43. Water 44. Smooth block; 45. Vertical slider; 46. Marking auxiliary block; 57. Fixing screw III; 58. Bending component profile support block; 59. Positioning rod; 121. Gradient upstream scale; 122. Ungradable upstream scale; 123. Downstream scale; 124. Rectangular hole; 321. Upstream scale; 322. Downstream scale; 431. Horizontal guide block; 432. Vertical guide block; 451. End face; 511. Profile. Detailed Implementation The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0034] Example 1 This embodiment is one of the implementation methods, a device for auxiliary marking of the curved section of a curved member, see reference. Figure 1 , 2 4, 6, 8, including base 6, two sets of vernier calipers 1, angle ruler 3, flexible auxiliary scribing mechanism 4, support I 2 for mounting vernier calipers 1, and support II 5 for placing bending components 7; Base 6 is used to install and fix angle ruler 3, support I 2 and support II 5; The two sets of vernier calipers 1 are identical in specifications and are arranged perpendicularly to each other in the horizontal plane. The two sets of vernier calipers 1 are installed and fixed on the corresponding support I2 to realize the installation and positioning of the vernier calipers 1. The vernier caliper 1 includes a main scale 11 and a vernier scale 12. Angle ruler 3 includes a main angle scale 31 and an angle vernier scale 32; The support II5 includes a bending member profile support block 51 and a positioning rod 52. The positioning rod 52 is mounted on the vernier caliper 1 and is used to limit the position of the support II5. The flexible auxiliary marking mechanism 4 includes a support rod 41, a fixing block 42, a horizontal slider 43, a vertical slider 44, a marking auxiliary block 45, and a locking component. The support rod 41 is mounted on the angle ruler 3 via the fixing block 42. The horizontal slider 43 includes a horizontal guide block 431 and a vertical guide block 432. After the position of the angle vernier caliper 32 is fixed, the horizontal slider 43, the vertical slider 44, and the marking auxiliary block 45 are moved until the marking auxiliary block 45 is in contact with the outer surface of the bending member 7. The locking component is then tightened to achieve the positioning and fixing of each component. The flexible auxiliary scribing mechanism 4 is connected to the angle ruler 3 and is used to fit the outer surface of the curved component 7 to assist in completing the scribing operation.

[0035] Example 2 This embodiment is a further optimization of embodiment 1, the difference being that, as referenced... Figure 2 The vernier scale 12 includes a graduated upstream scale 121, an ungraded upstream scale 122, and a downstream scale 123. The graduated upstream scale 121 and the ungraded upstream scale 122 are respectively fixed to the downstream scale 123 by fasteners.

[0036] Example 3 The difference between this embodiment and embodiments 1-2 is that, in reference to... Figure 4 The angle vernier scale 32 includes an upstream scale 321 and a downstream scale 123, which are assembled on the angle main scale 31 by fasteners; After the angle vernier caliper 32 moves to the predetermined position, tighten the fastener to fix the positioning of the angle vernier caliper 32.

[0037] Example 4 The difference between this embodiment and embodiment 3 is that, in reference... Figure 5 The angle ruler 3 also includes a locking block 33 and a shim 34, which are used to help fix the main angle scale 31 and the vernier angle scale 32.

[0038] Example 5 The difference between this embodiment and embodiments 1-4 is that, in reference to Figure 8 The bending member profile support block 51 is a replaceable structural component, and the profile 511 of the bending member profile support block 51 is one of the following: circular, rectangular, I-shaped or T-shaped.

[0039] Example 6 The difference between this embodiment and embodiments 1-5 is that, in reference... Figure 1 , 3 The support I2 has threaded holes I21 at both the upper and lower ends, and is fixedly connected to the base 6 by screws. The two ends of the two sets of vernier calipers 1 are fixed to the corresponding support I2 by screws.

[0040] Example 7.

[0041] Compared with embodiments 1 to 6, the difference in this embodiment is that a rectangular hole 124 is provided on the vernier scale 12, and the positioning rod 52 is installed in the rectangular hole 124, with the bottom of the positioning rod 52 contacting the base 6.

[0042] Example 8 To facilitate public understanding of the present invention, this embodiment uses an auxiliary marking device for the curved section of a curved component as an example for further explanation.

[0043] Overall structure reference of the device Figure 1It includes a base 6, two sets of vernier calipers 1, an angle ruler 3, a flexible auxiliary scribing mechanism 4, a support I 2 for mounting the vernier calipers 1, and a support II 5 for placing the bending component 7.

[0044] refer to Figure 2 The vernier caliper 1 includes a main scale 11, a vernier scale 12, and a fixing screw I 13. The vernier scale 12 includes a graduated upstream scale 121, an ungraded upstream scale 122, and a downstream scale 123. The graduated upstream scale 121 and the ungraded upstream scale 122 are respectively fixed to the downstream scale 123 by screws.

[0045] A rectangular hole 124 is made on the vernier scale 12 for mounting and fixing the support II5. The support II5 is used to place the bending component. The axis of the profile 511 of the support II5 coincides with the center of the rectangular hole 124 of the vernier scale 12 in the vertical direction.

[0046] Preferably, the center of the rectangular hole 124 of the vernier scale 12 is 22 mm away from the 0 mark of the main scale 11. Therefore, if it is necessary to scribing a line on the bent section of the bent member 7 with a bending radius of R, the vernier caliper value needs to be adjusted to R-22 mm.

[0047] This device includes two identical and symmetrical vernier calipers 1, arranged perpendicularly to each other in a horizontal plane. Both ends of the vernier calipers 1 are fixed to the support I2 with screws.

[0048] refer to Figure 1 , Figure 3 Support I2 is used to connect vernier caliper 1 and fix vernier caliper 1 to base 6. Support I2 has threaded holes I21 at its upper and lower ends, and supports I2 is fixed to base 6 by screws.

[0049] refer to Figure 4 , Figure 5 The angle ruler 3 includes a main angle scale 31, an angle vernier scale 32, a locking block 33, a washer 34, and a fixing screw II 35.

[0050] The angle vernier scale 32 includes an upstream scale 321 and a downstream scale 322.

[0051] The angle vernier scale 32 is connected and assembled on the angle main scale 31 by screws; after the angle vernier scale 32 moves to the predetermined position, by tightening the fixing screw II 35, the contact surface between the locking block 34 and the angle main scale 31 generates friction, thereby fixing the position of the angle vernier scale 32.

[0052] Preferably, the angle ruler 3 has an accuracy of 2′ and a measuring range of 0° to 90°.

[0053] refer to Figure 1 , Figure 6 The flexible auxiliary marking mechanism 4 includes a support rod 41, a fixing block 42, a horizontal slider 43, a vertical slider 44, a marking auxiliary block 45, and a fixing screw 46Ⅲ. The support rod 41 is mounted on the angle ruler 3 via the fixing block 42.

[0054] The horizontal slider 43 includes a horizontal guide block 431 and a vertical guide block 432. After the position of the angle vernier 32 of the angle ruler 3 is fixed, move the horizontal slider 43, the vertical slider 44, and the scribing auxiliary block 45 until the scribing auxiliary block 45 is in contact with the outer surface of the bending member 7, and tighten the fixing screw Ⅲ46.

[0055] refer to Figure 7 The end face 451 of the scribing auxiliary block 45 coincides with the 0 mark line of the angle vernier scale 32 of the angle ruler 3.

[0056] refer to Figure 8 The support II5 consists of a bending member profile support block 51 and a positioning rod 52. The positioning rod 52 is installed in the rectangular hole 124 of the vernier caliper 1, and the bottom of the positioning rod 52 contacts the base 6, which supports the support II5. The axis of the profile 511 of the support II5 coincides vertically with the center of the rectangular hole 124 of the vernier scale 12. The profile 511 of the support II5 can be made to support different types of cross-sectional shapes.

[0057] refer to Figure 9 The base 6 is the mounting base for the auxiliary marking device for the bending section of the bending component, and all components are mounted on the base 6.

[0058] The auxiliary scribing device for the curved section of the curved component in this embodiment is applicable to scribing operations on curved components with various cross-sectional shapes such as circles, rectangles, I-shapes, and T-shapes. (Refer to...) Figure 10 , Figure 10 The diagram shows three commonly used bending members of different shapes: a circular bending member (a), a rectangular bending member (b), and an I-shaped bending member (c).

[0059] Based on the above device, taking a conduit bending component with a circular cross-section, diameter Φ=22mm, wall thickness t=1mm, bending radius R=22mm, and bending angle α=90° as an example, the method for scribing a line at 45° on its bending section includes the following steps: S1. Place the base 6 on the horizontal working surface. First, install and fix the support I2 on the base 6. Then, fix the two vernier calipers 1 of the same specification to the corresponding support I2 with fasteners so that the two sets of vernier calipers 1 are arranged perpendicularly to each other in the horizontal plane. S2. Based on the cross-sectional shape of the bending member 7 to be scribed, select a bending member profile support block 51 that matches the profile 511. Install the positioning rod 52 of the support II 5 into the rectangular hole 124 on the vernier caliper 1 to achieve the limiting and fixing of the support I 2. Then place the bending member 7 to be scribed on the bending member profile support block 51 so that the outer surface of the bending member 7 fits against the profile 511 of the support II 5, thus completing the positioning and support of the bending member 7. Move the vernier scale 12 of the two vernier calipers 1 to the position of the bending radius R value of the bending member 7 (i.e., the 0mm scale position of the main scale 11) and tighten the fixing screws I 13 of the two vernier calipers 1 respectively. S3. After installing the angle ruler 3 into place, move the angle vernier caliper 32 to the preset scribing angle position (45° position), and tighten the fixing screw II 35 on the angle ruler 3 to fix the position of the angle vernier caliper 32. S4. Install the support rod 41 on the angle ruler 3 by fixing block 42, move the horizontal slider 43 composed of horizontal guide block 431 and vertical guide block 432, as well as the vertical slider 44 and scribing auxiliary block 45, until the scribing auxiliary block 45 is completely in contact with the outer surface of the bending member 7 to be scribed, tighten the fixing screw Ⅲ46 of the flexible auxiliary scribing mechanism 4 to complete the positioning and fixing of each component. S5. Using the scribing auxiliary block 45 that conforms to the outer surface of the curved member 7 as a guide, use a scribing tool (scribing needle / marker) to scribing along the curved section of the curved member 7, and complete the target scribing under the guidance of the scribing auxiliary block 45. After completing the scribing operation, loosen the fixing screw Ⅲ46 of the flexible auxiliary scribing mechanism 4, move the horizontal slider 43 and the vertical slider 44 of the flexible auxiliary scribing mechanism 4, and remove the scribing-marked curved member 7.

[0060] Example 9 This embodiment uses a bent member with a rectangular cross-section, length L=26mm, width H=20mm, wall thickness t=1mm, bending radius R=50mm, and bending angle α=90° as an example. (Reference) Figure 11 The method for scribing a line at 50° on the curved section of a curved member using the auxiliary scribing device of Example 1 includes the following steps: S1. Place the base 6 on the horizontal working surface. First, install and fix the support I2 on the base 6. Then, fix the two vernier calipers 1 of the same specification to the corresponding support I2 with fasteners so that the two sets of vernier calipers 1 are arranged perpendicularly to each other in the horizontal plane. S2. Based on the cross-sectional shape of the bending member 7 to be scribed, select a bending member profile support block 51 that matches the profile 511. Install the positioning rod 52 of the support II 5 into the rectangular hole 124 on the vernier caliper 1 to achieve the limiting and fixing of the support I 2. Then place the bending member 7 to be scribed on the bending member profile support block 51 so that the outer surface of the bending member 7 fits against the profile 511 of the support II 5, thus completing the positioning and support of the bending member 7. Move the vernier scale 12 of the two vernier calipers 1 to the position of the bending radius R value of the bending member 7 (i.e., the 28mm scale position of the main scale 11) and tighten the fixing screws I 13 of the two vernier calipers 1 respectively. S3. After installing the angle ruler 3 into place, move the angle vernier caliper 32 to the preset scribing angle position (50° position), and tighten the fixing screw II 35 on the angle ruler 3 to fix the position of the angle vernier caliper 32. S4. Install the support rod 41 on the angle ruler 3 by fixing block 42, move the horizontal slider 43 composed of horizontal guide block 431 and vertical guide block 432, as well as the vertical slider 44 and scribing auxiliary block 45, until the scribing auxiliary block 45 is completely in contact with the outer surface of the bending member 7 to be scribed, tighten the fixing screw Ⅲ46 of the flexible auxiliary scribing mechanism 4 to complete the positioning and fixing of each component. S5. Using the scribing auxiliary block 45 that conforms to the outer surface of the curved member 7 as a guide, use a scribing tool (scribing needle / marker) to scribing along the curved section of the curved member 7, and complete the target scribing under the guidance of the scribing auxiliary block 45. After completing the scribing operation, loosen the fixing screw Ⅲ46 of the flexible auxiliary scribing mechanism 4, move the horizontal slider 43 and the vertical slider 44 of the flexible auxiliary scribing mechanism 4, and remove the scribing-marked curved member 7.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An auxiliary marking device for the curved section of a curved component, characterized in that: Includes a base (6), two sets of vernier calipers (1), an angle ruler (3), a flexible auxiliary scribing mechanism (4), and a support I (2) for mounting the vernier calipers (1) and a support II (5) for placing the curved component (7); The base (6) is used to install the fixed angle ruler (3), support I (2) and support II (5); The two sets of vernier calipers (1) are identical in specifications and are arranged perpendicularly to each other in the horizontal plane. The two sets of vernier calipers (1) are installed and fixed on the corresponding support I (2). The support I (2) is used to realize the installation and positioning of the vernier calipers (1). The vernier calipers (1) include a main scale (11) and a vernier scale (12). The angle ruler (3) includes the main angle scale (31) and the vernier angle scale (32); The support II (5) includes a bending member profile support block (51) and a positioning rod (52). The positioning rod (52) is mounted on a vernier caliper (1) and is used to limit the position of the support II (5). The flexible auxiliary marking mechanism (4) includes a support rod (41), a fixing block (42), a horizontal slider (43), a vertical slider (44), a marking auxiliary block (45), and a locking component. The support rod (41) is mounted on the angle ruler (3) through the fixing block (42). The horizontal slider (43) includes a horizontal guide block (431) and a vertical guide block (432). After the position of the angle vernier ruler (32) is fixed, the horizontal slider (43), the vertical slider (44), and the marking auxiliary block (45) are moved until the marking auxiliary block (45) is in contact with the outer surface of the bending member (7). The locking component is tightened to achieve the positioning and fixing of each component. The flexible auxiliary scribing mechanism (4) is connected to the angle ruler (3) and is used to fit the outer surface of the curved component (7) to assist in completing the scribing operation.

2. The auxiliary marking device for the curved section of a curved member according to claim 1, characterized in that: The vernier scale (12) includes a graduated upstream scale (121), an ungraded upstream scale (122), and a downstream scale (123). The graduated upstream scale (121) and the ungraded upstream scale (122) are respectively fixed to the downstream scale (123) by fasteners.

3. The auxiliary marking device for the curved section of a curved component according to claim 1, characterized in that: The angle vernier scale (32) includes an upstream scale (321) and a downstream scale (123), which are mounted on the angle main scale (31) by fasteners; After the angle vernier scale (32) moves to the predetermined position, tighten the fastener to fix the position of the angle vernier scale (32).

4. The auxiliary marking device for the curved section of a curved member according to claim 3, characterized in that: The angle ruler (3) also includes a locking block (33) and a shim (34), which are used to help fix the main angle scale (31) and the vernier angle scale (32).

5. The auxiliary marking device for the curved section of a curved member according to claim 1, characterized in that: The bending member profile support block (51) is a replaceable structural component, and the profile (511) of the bending member profile support block (51) is one of the following: circular, rectangular, I-shaped or T-shaped.

6. The auxiliary marking device for the curved section of a curved member according to claim 1, characterized in that: The support I (2) has threaded holes at both ends and is fixedly connected to the base (6) by screws. The two ends of the two sets of vernier calipers (1) are fixed to the corresponding support I (2) by screws.

7. The auxiliary marking device for the curved section of a curved member according to claim 1, characterized in that: A rectangular hole (124) is provided on the vernier scale (12), and the positioning rod (52) is installed in the rectangular hole (124). The bottom of the positioning rod (52) is in contact with the base (6).

8. A method for marking the curved section of a curved member, characterized in that, The auxiliary marking device for the curved section of a curved member as described in claim 1 includes the following steps: S1. Place the base (6) on the horizontal working surface. First, install and fix the support I (2) on the base (6). Then, fix the two vernier calipers (1) of the same specification to the corresponding support I (2) with fasteners so that the two sets of vernier calipers (1) are arranged perpendicularly to each other in the horizontal plane. S2. According to the cross-sectional shape of the bending member (7) to be marked, select the bending member surface support block (51) with the matching surface (511), assemble the positioning rod (52) of the support II (5) onto the vernier caliper (1) to realize the limiting and fixing of the support I (2), and then place the bending member (7) to be marked on the bending member surface support block (51) to complete the positioning support of the bending member (7); S3. After installing the angle ruler (3) into place, move the angle vernier caliper (32) to the preset scribing angle position, tighten the fasteners on the angle ruler (3) to fix the position of the angle vernier caliper (32); S4. Install the support rod (41) on the angle ruler (3) by fixing block (42), move the horizontal slider (43) composed of horizontal guide block (431) and vertical guide block (432), as well as the vertical slider (44) and scribing auxiliary block (45) until the scribing auxiliary block (45) is completely in contact with the outer surface of the bending member (7) to be scribed, tighten the fasteners of the flexible auxiliary scribing mechanism (4) to complete the positioning and fixing of each component; S5. Using the scribing auxiliary block (45) that fits the outer surface of the curved member (7) as a guide, use the scribing tool to scribing along the curved section of the curved member (7) and complete the target scribing under the guidance of the scribing auxiliary block (45).

9. A method for marking the bending segment of a bent member according to claim 8, characterized in that: In step S2, the vernier scales (12) of the two vernier calipers (1) are adjusted to the scale positions that match the preset bending radius R of the bending component (7), and the corresponding fastening parts of each vernier caliper (1) are tightened and locked to keep the position of the vernier scales (12) fixed.

10. A method for marking the bending segment of a bent member according to claim 8, characterized in that: In step S5, a line is drawn on the outer surface of the curved member (7) along the scribing auxiliary block (45) using a scribing needle / marker.

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