A device for high-precision reproduction of the center of bolt holes in thick flanges

Abstract

This invention relates to the field of flange bolt hole centering technology, specifically a device for high-precision reproduction of the center of bolt holes in thick flanges. The device includes a centering main frame that can be inserted into the bolt holes of the flange body, a target head component fixedly mounted at the top of the centering main frame, with a target center for measurement at the top center of the target head component, and a lifting component movably disposed axially inside the centering main frame. This invention provides high-precision bolt hole center coordinates, ensuring the processing accuracy of prefabricated flange pipe sections from the source, completely avoiding the occurrence of "misaligned holes" during on-site installation, improving installation efficiency, ensuring the sealing and safety of equipment connections, and reducing the huge costs and project delays caused by modifying or scrapping pipe sections.

Description

Technical Field

[0001] This invention relates to the field of flange bolt hole centering technology, specifically to a device for high-precision reproduction of the center of bolt holes in thick flanges. Background Technology

[0002] In large-scale equipment manufacturing, pressure vessel installation, and pipeline system engineering, flange connection is one of the most common connection methods, and its connection accuracy directly affects the sealing performance and long-term safe operation of the equipment. To achieve precise alignment, it is usually necessary to accurately measure and reproduce the center position of the flange bolt holes on-site to provide a data basis for the subsequent prefabrication of pipe sections.

[0003] Currently, there are two main traditional methods for reproducing the center of flange bolt holes:

[0004] One method is to use a cylindrical tool with a fixed diameter to insert into the bolt hole to obtain the center position. However, due to the objective existence of manufacturing tolerances, the actual diameter of the bolt hole often deviates, causing the fixed-size tool to frequently "not fit" and become unusable, or "have too large a gap" and wobble inside the hole. This results in a large deviation between the obtained center position and the actual hole center, failing to meet the requirements of high-precision measurement.

[0005] Secondly, a method of fixing the flange by embedding a conical tool from the back of the flange is used. Although this method can adapt to changes in bore diameter to some extent, for thicker flanges, the slight positional deviation of the contact point (single circle intersection) between the conical surface and the inner wall of the bolt hole will be transmitted to the front of the flange along the angle of the conical surface and be significantly amplified, resulting in a large error in the center of the reproduced front bolt hole, making it difficult to guarantee accuracy.

[0006] Therefore, existing technologies cannot accurately and reliably reproduce the center position of bolt holes on thick flanges with hole diameter deviations, and a new solution is urgently needed. Utility Model Content

[0007] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a device for high-precision reproduction of the center of bolt holes in thick flanges, so as to solve the problem of deviation in the centering of flange bolt holes mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A device for high-precision reproduction of the center of bolt holes in a thick flange includes a flange body with bolt holes, wherein:

[0010] The centering main frame can be inserted into the bolt holes of the flange body;

[0011] The target head component is fixedly mounted on the top of the centering main frame, and the top center of the target head component is provided with a target center for measurement.

[0012] A lifting component is axially movable inside the centering main frame;

[0013] Multiple claw telescopic blocks are slidably disposed on the centering main frame in the circumferential direction, and the inner side of the claw telescopic blocks is provided with an inclined surface structure that cooperates with the lifting component.

[0014] A drive mechanism is used to drive the lifting member to move axially. During the axial movement, the lifting member pushes the multiple claw telescopic blocks to expand radially synchronously through the inclined structure, so that the outer side of the claw telescopic block is tangent to and pressed against the inner wall of the flange bolt hole, thereby realizing the automatic centering of the centering main frame and the flange bolt hole.

[0015] The driving mechanism includes a tension adjustment block disposed on the lifting member and a bottom sealing plate connected to the bottom of the centering main frame. The bottom sealing plate is threadedly connected to the lifting member. Rotating the tension adjustment block can drive the lifting member to move axially relative to the bottom sealing plate.

[0016] The outer surface of the tension adjustment block is provided with anti-slip texture.

[0017] It also includes a return spring, which is sleeved on the claw telescopic block and is used to provide an elastic force to cause the claw telescopic block to retract radially and return to its original position when the lifting member moves in the reverse direction.

[0018] The reset spring is a ring-shaped fastening spring, and the centering main frame is provided with a corresponding groove for accommodating and avoiding the ring-shaped fastening spring.

[0019] The number of the claw telescopic blocks is four, and they are evenly distributed along the circumference of the centering main frame.

[0020] The target head component is fixedly connected to the top of the centering main frame by a plurality of fixing screws.

[0021] The bottom sealing plate is fixedly connected to the bottom of the centering main frame by multiple fixing screws.

[0022] The bottom plane of the target head component is perpendicular to the centerline of the centering main frame.

[0023] The centerlines of the target, the target head component, and the lifting component coincide.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The four-jaw synchronous radial centering mechanism enables the jaw extension block to achieve multi-point tangency with the inner wall of the bolt hole, rather than single-point or line contact, thereby accurately reproducing the geometric center of the hole and greatly reducing the center positioning error caused by hole diameter manufacturing deviation and flange thickness.

[0026] The screw-driven lifting mechanism drives the chuck to expand continuously and smoothly with adjustable stroke, effectively adapting to bolt holes of different diameters. This solves the problem that traditional fixed-size tooling cannot match all hole diameters, making it more versatile.

[0027] The device can be locked and released by rotating the anti-slip adjustment block. It is simple to operate, saves time and effort, and the ring-shaped fastening spring ensures the automatic reset of the claw, making the disassembly process easy and quick.

[0028] After the device is centered, the upper surface of the target head component fits tightly against the flange end face, and the center of the target at its top precisely coincides with the actual center of the bolt hole in space. This design ensures that the target center can serve as a stable and reliable physical reference point, and can be adapted to various high-precision measurement systems (such as close-range photogrammetry, laser tracking, total station measurement, etc.), providing a universal and consistent measurement reference for accurately acquiring three-dimensional coordinate data.

[0029] By providing high-precision bolt hole center coordinates, the processing accuracy of prefabricated flange pipe sections can be guaranteed from the source, completely avoiding the occurrence of "misaligned holes" during on-site installation, improving installation efficiency, ensuring the sealing and safety of equipment connections, and reducing the huge costs and project delays caused by modifying or scrapping pipe sections. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0032] Figure 3 This is a schematic cross-sectional view of the present invention;

[0033] Figure 4 This is a schematic diagram of the device of the present invention in use;

[0034] Figure 5 This is a schematic diagram of the overall explosion structure of the present invention;

[0035] Figure 6 This is a physical illustration of the present invention.

[0036] In the diagram: 1. Target center; 2. Target head component; 3. Fixing screw one; 4. Centering main frame; 5. Claw telescopic block; 6. Annular fastening spring; 7. Bottom sealing plate; 8. Fixing screw two; 9. Tightness adjustment block; 10. Lifting component; 11. Flange body. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] One embodiment provided by the present invention:

[0039] refer to Figures 1-3 A device for high-precision reproduction of the center of bolt holes in a thick flange includes a flange body 11. The device is characterized by: a target head component 2 disposed in the bolt holes of the flange body 11, with a target center 1 at its center for subsequent measurement and positioning; the target head component 2 being connected to a centering main frame 4 via four sets of fixing screws 3; the bottom of the centering main frame 4 being connected to a bottom sealing plate 7 via four sets of fixing screws 8; a lifting component 10 inserted inside the centering main frame 4, the surface of which has two sections of truncated cone structure; four sets of circumferentially sliding jaw extension blocks 5 slidably installed in the centering main frame 4, these jaw extension blocks 5 contacting the truncated cone surface of the lifting component 10 via their inner inclined edges; two sets of annular fastening springs 6 installed in the jaw extension blocks 5 via grooves to achieve automatic reset function; a tension adjustment block 9 with anti-slip texture is also mounted on the lifting component 10 for manual operation; the bottom sealing plate 7 is threadedly connected to the lifting component 10.

[0040] The bottom surface of the target head component 2 is attached to the surface of the flange body 11, the centering main frame 4 is inserted into the flange bolt hole, and the claw telescopic block 5 contacts the inner wall of the flange bolt hole to achieve centering.

[0041] Furthermore, the target head component 2 adopts a 3mm reflective marker point, which facilitates the accurate acquisition of the three-dimensional coordinates of the center of the circle through close-range industrial photogrammetry; both the fixing screw 3 and the fixing screw 8 are M3 type screws.

[0042] The target center 1 is located at the exact center of the top of the target head component 2, and the target head component 2 and the lifting component 10 maintain the same axis to ensure that the measurement reference is consistent.

[0043] There are four sets of the claw telescopic blocks 5, which are evenly distributed in a ring inside the centering main frame 4; the centering main frame 4 is provided with a clearance groove at the position corresponding to the ring fastening spring 6 to facilitate the extension and retraction of the spring.

[0044] Figure 4 The diagram in the middle shows the device installed in the 11 bolt holes. Figure 5 This is a schematic diagram of the exploded structure of this device. Figure 6 This is a photo of the actual product.

[0045] It should be noted that the target head component 2 adopts a modular design that allows for quick replacement. Its core function is to provide a precise positioning reference point for the measurement system. This component is not limited to the 3mm reflective marker point described in this embodiment (mainly used for close-range photogrammetry), but can also be flexibly replaced with other types of targets suitable for different measurement principles and signal receiving media. For example, it can be replaced with: an infrared laser reflective target ball suitable for laser trackers; a high-precision optical prism target suitable for total stations; or a magnetic target suitable for magnetic measurement systems, etc. This design greatly enhances the versatility and application range of this device, enabling it to be seamlessly integrated into various industrial measurement systems (such as optical, laser, infrared, and electromagnetic measurement systems) to meet the specific needs of different measurement environments, accuracy requirements, and signal receiving media.

[0046] Working principle:

[0047] The working principle of this device is based on a linkage mechanism of mechanical centering and thread lifting, which enables high-precision reproduction of the center of the flange bolt hole. The specific process is as follows:

[0048] Initial installation and positioning: Insert the assembled device into the bolt holes of the flange body 11, ensuring that the bottom of the target head component 2 is fully in contact with the flange surface.

[0049] Claw Expansion and Centering: Rotating the tension adjustment block 9 causes the lifting component 10 to rotate. Since the lifting component 10 and the bottom sealing plate 7 are connected by a thread, the rotational motion is converted into axial downward movement of the lifting component 10. The truncated cone on the surface of the lifting component 10 descends accordingly, pushing the four sets of claw telescopic blocks 5 outwards radially along the sliding grooves of the centering main frame 4 through the inclined plane, until they are completely tangent to and pressed against the inner wall of the flange bolt hole. At this point, the entire device is firmly fixed inside the hole, and the uniform expansion of the claws ensures that the device's axis coincides with the center of the bolt hole.

[0050] Center Reproduction and Measurement: The target head component 2 is rigidly connected to the centering main frame 4 via fixing screw 3. When the axis of the centering main frame 4 coincides with the center of the hole, the target center 1 at the top of the target head component 2 accurately reproduces the actual center position of the flange bolt hole. At this time, an industrial photogrammetry system can be used to photograph the target center 1 to obtain its precise three-dimensional coordinates, providing a data basis for the subsequent precision machining and installation of the flange pipe section.

[0051] Disassembly and Reset: After measurement, rotate the tension adjustment block 9 in the opposite direction to move the lifting component 10 upward, releasing its radial thrust on the claw telescopic block 5. Under the rebound action of the annular fastening spring 6, the four sets of claw telescopic blocks 5 retract inward synchronously, disengaging from contact with the hole wall, and then the entire device can be smoothly removed from the bolt hole.

[0052] This device effectively overcomes the center positioning error caused by hole diameter deviation and flange thickness in traditional methods through a four-jaw synchronous centering mechanism, significantly improving the accuracy and reliability of center reproduction. This allows for accurate acquisition of the installation rotation angle during prefabrication of flange pipe sections, completely avoiding misalignment during on-site installation.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for high-precision reproduction of the center of bolt holes in a thick flange, comprising a flange body (11) with bolt holes, characterized in that: The centering main frame (4) can be inserted into the bolt holes of the flange body (11); The target head component (2) is fixedly installed at the top of the centering main frame (4), and the top center of the target head component (2) is provided with a target center (1) for measurement. A lifting component (10) is axially movable inside the centering main frame (4); Multiple claw telescopic blocks (5) are slidably disposed on the centering main frame (4) along the circumferential direction. The inner side of the claw telescopic block (5) is provided with an inclined surface structure that cooperates with the lifting member (10). The driving mechanism is used to drive the lifting member (10) to move axially. During the axial movement, the lifting member (10) pushes the multiple claw telescopic blocks (5) to expand radially in sync through the inclined structure, so that the outer side of the claw telescopic block (5) is tangent to and pressed against the inner wall of the flange bolt hole, thereby realizing the automatic centering of the centering main frame (4) and the flange bolt hole.

2. A device for accurately reproducing the center of a bolt hole in a thick flange according to claim 1, characterized in that: The driving mechanism includes a tension adjustment block (9) disposed on the lifting member (10) and a bottom sealing plate (7) connected to the bottom of the centering main frame (4). The bottom sealing plate (7) is threadedly connected to the lifting member (10). Rotating the tension adjustment block (9) can drive the lifting member (10) to move axially relative to the bottom sealing plate (7).

3. A device for accurately reproducing the center of a bolt hole in a thick flange according to claim 2, characterized in that: The outer surface of the tension adjustment block (9) is provided with anti-slip texture.

4. The apparatus for high-precision reproduction of the center of a thick flange bolt hole according to claim 1, characterized in that: It also includes a reset spring, which is sleeved on the claw telescopic block (5) and is used to provide an elastic force to cause the claw telescopic block (5) to radially retract and reset when the lifting member (10) moves in the opposite direction.

5. A device for accurately reproducing the center of a bolt hole in a thick flange according to claim 4, characterized in that: The reset spring is a ring-shaped fastening spring (6), and the centering main frame (4) is provided with a groove for accommodating and avoiding the ring-shaped fastening spring (6).

6. The device for high-precision reproduction of the center of bolt holes in thick flanges according to claim 1, characterized in that: The number of the claw telescopic blocks (5) is four, and they are evenly distributed along the circumference of the centering main frame (4).

7. The device for high-precision reproduction of the center of bolt holes in thick flanges according to claim 1, characterized in that: The target head component (2) is fixedly connected to the top of the centering main frame (4) by a plurality of fixing screws (3).

8. The device for high-precision reproduction of the center of bolt holes in thick flanges according to claim 2, characterized in that: The bottom sealing plate (7) is fixedly connected to the bottom of the centering main frame (4) by a plurality of fixing screws (8).

9. The device for high-precision reproduction of the center of bolt holes in thick flanges according to claim 1, characterized in that: The bottom plane of the target head component (2) is perpendicular to the axis of the centering main frame (4).

10. The device for high-precision reproduction of the center of bolt holes in thick flanges according to claim 1, characterized in that: The centerlines of the target center (1), the target head component (2), and the lifting component (10) coincide.

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