Vacuum tube inner hole straightness detection device

Abstract

The application discloses a vacuum tube inner hole straightness detection device and relates to the technical field of particle accelerators. The vacuum tube inner hole straightness detection device comprises the following: a plurality of pipeline supports, which are arranged along a pipeline derivation direction and form a support space above the plurality of pipeline supports; the plurality of pipeline supports are configured to support a pipeline to be detected; a mobile detection unit, which is movably arranged in the support space; and a detection assembly, which is arranged at one end of the plurality of pipeline supports and is used for detecting the mobile detection unit. The technical scheme provided by the application solves the technical problem that conventional measurement tools cannot be inserted into a micro inner diameter pipeline for full-length continuous measurement, and provides a vacuum tube inner hole straightness detection device which is simple in structure and suitable for micro pipeline working conditions.

Description

Technical Field

[0001] This invention relates to the field of particle accelerator technology, and in particular to a device for detecting the straightness of the inner hole of a vacuum tube. Background Technology

[0002] In ion accelerator systems, the vacuum beam tube is the core channel for charged particle transport, and its axial straightness is a key geometric accuracy indicator that determines the overall performance of the accelerator. In existing technologies, deviations in tube straightness can lead to beam wall collision losses and irreversible increases in emittance, degrading beam quality; causing electromagnetic field center mismatch, generating higher-order field components and nonlinear beam dynamics effects; and simultaneously increasing the risk of vacuum seal failure and the difficulty of system collimation, severely restricting the accelerator's operating efficiency and reliability.

[0003] Currently, the main methods for detecting the straightness of the inner hole of vacuum tubes include the wire pulling method and the laser collimation method. Among them, the wire pulling method requires precise control of the wire tension to avoid sagging, which is cumbersome to operate; although the laser collimation method has high detection accuracy, the equipment is expensive, has strict requirements for the detection environment, and is not portable, making it difficult to achieve rapid on-site detection. Summary of the Invention

[0004] The main objective of this invention is to propose a device for detecting the straightness of the inner hole of a vacuum tube, which aims to solve the technical problems of the cumbersome operation of the wire pulling method and the high accuracy of the laser collimation method, which are expensive, have strict requirements on the detection environment, and are not portable, making it difficult to achieve rapid on-site detection. This invention provides a device for detecting the straightness of the inner hole of a vacuum tube that is highly adaptable to the environment and suitable for small-diameter tubes.

[0005] To achieve the above objectives, the present invention provides a device for detecting the straightness of the inner hole of a vacuum tube, comprising: A pipe support, wherein a support space is formed above the pipe support for supporting the pipe to be tested; A mobile detection unit, which is movably disposed within the support space; and, A detection component is disposed at one end of the support space and is used to detect the moving detection unit.

[0006] In one embodiment, the motion detection unit includes: A mobile detection unit body, which is configured to be movably disposed within the support space; A luminescent target is disposed at one end of the moving detection unit body facing the detection component; The detection component is configured to detect the displacement of the luminescent target.

[0007] In one embodiment, the moving detection unit body is configured to circumferentially elastically abut against the inner wall of the pipeline to be detected, and is coaxially arranged with the pipeline to be detected.

[0008] In one embodiment, a plurality of spring groups are axially uniformly arranged on the circumferential surface of the moving detection unit body, each spring group including a plurality of guide springs, and the plurality of guide springs in each spring group are arranged in a ring array.

[0009] In one embodiment, the guide spring extends from the body of the motion detection unit, and the extension direction is opposite to the movement direction of the body of the motion detection unit.

[0010] In one embodiment, a traction component is provided at the end of the moving detection unit away from the detection component, and the traction component is configured to allow the moving detection unit to slide from one end to the other end within the pipeline to be detected.

[0011] In one embodiment, the traction assembly includes a reel with a traction line wound on it, and one end of the traction line away from the reel is fixedly connected to the motion detection unit.

[0012] In one embodiment, the output end of the spool is coaxially arranged with the axis of the pipeline to be tested.

[0013] In one embodiment, the traction assembly further includes: A tensioning and retaining structure is provided, which is disposed between the reel and the pipeline to be tested, and the output end of the tensioning and retaining structure is coaxially disposed with the pipeline to be tested; the traction line pulls the moving detection unit via the reel and the tensioning and retaining structure.

[0014] In one embodiment, the detection component includes: An industrial camera configured to detect radial displacement of the moving detection unit.

[0015] The technical solution of this invention, by setting up multiple pipe supports arranged along the pipe's extension direction, combined with a movable detection unit inside the pipe and a detection component fixed at the end, constitutes a detection logic of external fixed support, internal moving point detection, and end optical recognition. It utilizes a movable detection unit that can enter the pipe to replace the traditional external physical ruler or complex laser collimator, transforming the morphological features inside the closed pipe into dynamically trackable physical coordinates. This structure is not limited by the pipe's diameter or length, effectively solving the technical problem that conventional measuring tools on the market cannot easily reach into small-diameter pipes for continuous full-length measurement, and improving the compatibility of the detection device with pipes of different specifications.

[0016] The detection component is fixed to the external end of the pipeline, capturing the displacement changes of the moving detection unit inside the pipeline in real time in a non-contact manner. This not only avoids the miniaturization challenges of stuffing complex detection sensors into the pipeline, but also reduces the manufacturing cost and maintenance difficulty of the equipment.

[0017] The steel rope method requires continuous operation of the steel wire rope. The technical solution described in this invention does not require continuous operation by operators, can realize automated measurement, and also eliminates the need for a complex laser collimation emission and calibration system, reducing the hardware cost and assembly difficulty of the equipment, and improving the applicability of the device in various working environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of the vacuum tube inner hole straightness detection device provided by the present invention. Figure 2 A cross-sectional view of an embodiment of the vacuum tube inner hole straightness detection device provided by the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 A schematic diagram of the moving detection unit of an embodiment of the vacuum tube inner hole straightness detection device provided by the present invention; Explanation of icon numbers: 100. Vacuum tube inner hole straightness detection device; 1. Traction structure; 11. Traction assembly; 111. Motor; 112. Drive shaft; 113. Bearing seat; 114. Thread wheel; 115. Traction line; 12. Guide assembly; 2. Moving detection unit; 21. Moving detection unit body; 22. Guide spring; 23. Illuminating target; 3. Detection structure; 31. Industrial camera; 32. Processing module; 4. Pipe support; 5. Platform base; 6. Pipe to be tested.

[0020] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] Please see Figures 1 to 3 In one embodiment of the present invention, the vacuum tube inner hole straightness detection device 100 includes: Multiple pipe supports 4 are arranged along the pipe extension direction, and a support space is formed above the multiple pipe supports 4; the multiple pipe supports 4 are configured to support the pipe 6 to be tested; A movable detection unit, which is movably disposed within the support space; and, The detection structure 3 is disposed at one end of the plurality of pipe supports 4 and is used to detect the moving detection unit.

[0025] Specifically, the pipe support 4 is fixedly mounted on the platform base 5, and multiple pipe supports 4 arranged in a straight line provide multi-point support for the pipe 6 to be tested. The pipe 6 to be tested is mounted on the V-groove or arc-shaped support surface on the top of the pipe support 4, forming a stable detection reference channel. The movable detection unit, as a movable detection unit, has an outer diameter smaller than the inner diameter of the pipe 6 to be tested, and can slide and translate along the axis of the pipe under external force. The detection structure 3, as a fixed optical signal acquisition terminal, is installed outside the end opening of the pipe 6 to be tested, and its optical axis coincides with the theoretical axis of the pipe 6 to be tested. During the detection process, as the movable detection unit moves continuously inside the pipe, the detection structure 3 captures in real time the radial deviation signal generated by the movable detection unit due to the unevenness of the inner wall of the pipe.

[0026] The technical solution of this invention adopts a structure combining external fixed detection and internal moving detection. Multiple pipe supports 4 provide stable reference support, and the moving detection unit is placed inside the pipe as a positioning reference point for movement. This structure utilizes the principle of optical non-contact measurement to convert the physical spatial features inside the pipe, which are difficult to access, into optical signal output. The detection structure 3 captures the spatial positional changes of the moving detection unit during movement, and can then inversely calculate the straightness geometric error of the pipe's inner wall surface. This design avoids the technical bottleneck of the traditional straightedge method, which cannot be applied in narrow spaces, while eliminating the need for a complex laser collimation and calibration system, reducing the manufacturing cost of the equipment, and improving the applicability and detection efficiency of the device in various operating environments.

[0027] In an embodiment of the present invention, the motion detection unit is a subset of motion detection unit 2, and includes: The mobile detection unit body 21 is configured to be movable and disposed within the pipeline 6 to be detected. A light-emitting target 23 is disposed on the side facing the detection structure 3, and the detection structure 3 is configured to detect the displacement of the light-emitting target 23.

[0028] Specifically, the moving detection unit body 21 is a cylindrical support substrate. The light-emitting target 23 is embedded or fixed to the front end face of the moving detection unit body 21 facing the detection structure 3. The light-emitting target 23 integrates a high-brightness LED light source, and its surface is covered with a transparent glass plane lens or mask with a specific geometric pattern, such as concentric circles or crosshairs. When the light-emitting target 23 is powered on and emits light, the optical pattern of a specific shape is projected outward along the pipeline axis. The detection structure 3 receives the projected image in real time through the optical lens and uses the algorithm of the image processing module 32 to identify the position coordinates of the geometric center of the image.

[0029] By splitting the motion detection unit into two parts, the motion detection unit body 21 and the light-emitting target 23, the motion detection unit is directly used as an active light source, which can emit clear and high-contrast optical patterns, overcoming the interference caused by the dim environment inside the pipeline and the cluttered background reflections on image extraction. This active motion detection unit ensures that the detection structure 3 can still acquire image data with a good signal-to-noise ratio over a long distance, thereby ensuring the accuracy of spot center coordinate extraction and the reliability of data processing.

[0030] In an embodiment of the present invention, the moving detection unit body 21 is circumferentially elastically abutted against the inner wall of the pipeline 6 to be detected, the moving detection unit body 21 is configured to be coaxially arranged with the pipeline 6 to be detected, and the detection structure 3 is configured to detect the offset of the luminescent target 23.

[0031] Specifically, the outer peripheral surface of the moving detection unit body 21 is not in rigid contact with the inner wall of the pipeline 6 to be tested. A uniform expansion preload is applied to the moving detection unit body 21 in the radial direction, forcing its geometric center to always approach and coincide with the actual center of the pipeline's inner bore at that cross-section. As the moving detection unit moves along the pipeline, its center trajectory represents the three-dimensional spatial shape of the pipeline's inner bore. The detection structure 3 continuously captures the radial displacement of the luminous target 23 from the theoretical optical axis, altering both the horizontal and vertical coordinates, to digitally reconstruct the pipeline's straightness error.

[0032] The circumferential elastic contact design endows the moving detection unit body 21 with the function of automatic centering and contouring within the pipeline. When there are minor irregularities, ellipticity errors, or fluctuations in pipe diameter tolerances on the inner wall of the pipeline, the elastic support can automatically compensate for gap changes, maintaining the stability of the moving detection unit body 21's posture and avoiding the jamming or wobble that is prone to occur with rigid sliders. This adaptive coaxial movement mechanism ensures that the extracted displacement data of the luminous target 23 can accurately reflect the trend of the geometric center axis of the pipeline's inner hole, eliminating additional mechanical measurement errors introduced by loose clearance fits.

[0033] In an embodiment of the present invention, a plurality of spring sheet groups are axially uniformly arranged on the circumferential surface of the moving detection unit body 21, and each spring sheet group includes a plurality of guide spring sheets 22, and the plurality of guide spring sheets 22 in each spring sheet group are arranged in a ring array.

[0034] Specifically, the outer cylindrical surface of the moving detection unit body 21 is divided into multiple installation areas along the axial direction, and a spring group is arranged in each installation area. Each spring group contains at least three guide springs 22. These guide springs 22 are arranged in a centrally symmetrical ring array around the axis of the moving detection unit body 21. The root of each guide spring 22 is fixed to the body, and the free end expands outward and slides in contact with the inner wall of the pipeline 6 to be tested. By setting multiple spring groups arranged in a ring array, a spatial multi-point floating support model is constructed between the moving detection unit and the inner wall of the pipeline 6 to be tested. The guide springs 22 evenly distributed in the circumferential direction can provide mutually balanced radial reaction forces, enabling the moving detection unit to achieve high-precision automatic centering in the vertical section; while the multiple spring groups arranged axially at intervals increase the support span, effectively suppressing the pitch or yaw angle displacement of the moving detection unit during movement, ensuring that the projection optical axis of the light-emitting target 23 is always parallel to the local axis of the pipeline, further improving the stability of optical measurement.

[0035] In an embodiment of the present invention, the guide spring 22 extends from the motion detection unit body 21, and the extending direction is opposite to the movement direction of the motion detection unit body 21.

[0036] Specifically, the guide spring 22 adopts a cantilever beam structure, with its fixed end connected to the front of the moving detection unit body 21, i.e., the side near the luminous target 23. Its extension direction is backward and outward, following the moving direction of the body. When the moving detection unit moves forward under the action of traction force, the surface of the inclined guide spring 22 forms an acute-angle dragging sliding contact with the inner wall of the pipeline 6 to be tested.

[0037] The guide spring 22 is designed to extend at an angle away from the direction of movement, allowing it to slide smoothly in the forward direction during movement. This dragging sliding provides excellent guiding compliance, easily traversing any minor welds, burrs, or steps that may exist inside the tube, avoiding the risk of spring bending or jamming during reverse propulsion. Simultaneously, this inclined structure reduces sliding friction resistance during movement, making the traction process smoother and reducing vibration of the moving detection unit body 21 caused by sudden changes in frictional force, thus ensuring the clarity of optical imaging.

[0038] In an embodiment of the present invention, a traction component 11 in a traction structure 1 is provided at the end of the luminescent target 23 away from the detection structure 3. The traction component 11 is configured to allow the moving detection unit to slide from one end to the other end within the pipeline to be detected 6.

[0039] Specifically, the traction component 11 is located at the rear of the moving detection unit body 21, i.e., on the side facing away from the light-transmitting surface of the luminous target 23. The traction component 11 serves as a power transmission mechanism and is connected to an external drive source. The external drive source provides continuous or stepped traction force, which is transmitted to the moving detection unit body 21 through the traction component 11. This overcomes the friction between the guide spring 22 and the pipe wall, forcing the entire moving detection unit to pass through the entire pipe 6 to be tested at a uniform speed or in fixed-point steps. By placing the traction component 11 at the end of the luminous target 23 furthest from the detection structure 3, spatial decoupling of the optical detection path from the power transmission path is achieved. The traction component 11 is located on the backlight side, completely eliminating physical obstruction of the light projected from the luminous target 23 by mechanical components or traction lines, ensuring the integrity of the optical pattern within the field of view of the detection structure 3. Simultaneously, this back-dragging method helps maintain the stability of the moving detection unit body 21 during movement, avoiding the body swaying and instability easily caused by push-rod type drives.

[0040] In an embodiment of the present invention, the traction assembly 11 includes a reel 114, on which a traction line 115 is wound, and one end of the traction line 115 away from the reel 114 is fixedly connected to the motion detection unit.

[0041] Specifically, the traction component 11 is implemented through a flexible transmission method. The external drive source is a motor 111, and the output shaft of the motor 111 drives the reel 114 to rotate via the transmission shaft 112. The traction line 115 can be made of high-strength steel wire rope or Kevlar fiber thread, with one end fixed and wound on the drum of the reel 114, and the other end of the traction line 115 passing through the pipeline to be tested 6 and rigidly connected to the tail ring of the moving detection unit body 21. The rotation of the motor 111 drives the reel 114 to wind the traction line 115, thereby generating tension to pull the moving detection unit from one end of the pipeline to the other.

[0042] The traction method employing a combination of a reel 114 and a flexible traction line 115 results in a simplified structure and smaller footprint, significantly expanding the adaptability of the detection device 100 to pipelines of varying lengths. Theoretically, it is not limited by the length limit of the mechanical rigid push rod. The flexible traction line 115 itself lacks bending stiffness, preventing the transmission of radial runout or installation errors from the drive end to the moving detection unit body 21. This effectively blocks external mechanical vibrations from interfering with the positioning reference within the pipe, ensuring the purity of the detection data.

[0043] In an embodiment of the present invention, the output end of the reel 114 is coaxially arranged with the axis of the pipeline 6 to be tested.

[0044] Specifically, the reel 114 is mounted on the bearing housing 113 bracket, and the position of the exit point of the winding traction line 115 is precisely adjusted so that the extension direction of the traction line 115 after being pulled out is on the same straight line as the theoretical geometric axis of the pipeline 6 to be tested. During the winding process, the traction force applied to the moving detection unit body 21 always acts backward along the pipeline axis.

[0045] The output end of the reel 114 is coaxially aligned with the pipeline axis, ensuring that the tension of the traction line 115 on the moving detection unit is a pure axial force. This eliminates the additional overturning moment on the moving detection unit body 21 caused by eccentric traction force. It prevents the moving detection unit body 21 from tilting up or experiencing increased local friction due to uneven force during movement, ensuring that the force and deformation of the guide spring 22 group remain uniform and symmetrical in the circumferential direction, further securing the coaxiality between the detection movement trajectory and the actual axis of the pipeline.

[0046] In an embodiment of the present invention, the traction structure 1 further includes: a guide component 12 as a tensioning and retaining structure, the guide component 12 being disposed between the reel 114 and the pipeline to be tested 6, the output end of the guide component 12 being coaxially disposed with the pipeline to be tested 6; the traction line 115 pulling the moving detection unit via the reel 114 and the guide component 12.

[0047] Specifically, the guide assembly 12 is arranged on the path of the traction line 115 between the reel 114 and the end inlet of the pipeline 6 to be tested. The guide assembly can be a tensioning wheel assembly or a rubber sleeve with a small through-hole at its center, the diameter of which is equal to or slightly smaller than the diameter of the traction line 115. After the traction line 115 is released from the reel 114, it passes around the guide wheel of the guide assembly 12 and then enters the pipeline to connect to the moving detection unit. The center of the final exit guide wheel of the guide assembly 12 is coaxially aligned with the pipeline 6 to be tested. When the reel 114 rotates, the guide assembly 12 dynamically absorbs any slack or sudden changes in force that may occur in the traction line 115.

[0048] The guide component 12 provides dynamic tension compensation for the traction wire 115, eliminating the problem of fluctuating tension in the traction wire 115 caused by changes in the winding radius of the reel 114 or fluctuations in friction within the tube. This constant tension prevents the traction wire 115 from exhibiting a string effect, eliminates the blurring and jittering of the light spot image caused by high-frequency vibrations of the traction wire 115 transmitted to the moving detection unit, improves the clarity of optical image acquisition, and ensures the continuity and accuracy of data coordinate extraction during continuous detection.

[0049] In an embodiment of the present invention, the detection structure 3 includes an industrial camera 31 configured to detect the radial displacement of the moving detection unit.

[0050] Specifically, the industrial camera 31 is fixed to the platform base 5 via an industrial camera bracket, with its lens aimed at the opening of the pipe 6 to be inspected, and is in a stationary state. The industrial camera 31 is a digital camera with an area array sensor, coupled with a telephoto lens. Throughout the movement of the moving inspection unit from the far end to the near end of the pipe, the industrial camera 31 continuously captures the transmitted light spot of the luminous target 23 at a set frame rate. The captured image sequence is transmitted to the acquisition card and computer, where the algorithm in the processing module 32 extracts the specific straightness changes. The processing module 32 includes a data acquisition card and a host computer. The host computer integrates a moment image recognition algorithm (such as Zernike moments) and a nonlinear optimization algorithm.

[0051] Employing an industrial camera 31 as the detection method enables non-contact, high-frequency data acquisition, eliminating the need for complex interferometric ranging or mechanical stylus scanning. The hardware architecture is simple and durable. The industrial camera 31 can output high-resolution two-dimensional matrix data at the megapixel level. Combined with the sub-pixel edge extraction algorithm of the processing module 32, the radial micro-displacement recognition accuracy of the luminous target 23 can be improved to the micrometer level. By combining time axis and traction displacement information, a three-dimensional straightness deviation curve of the entire length of the pipeline's inner bore can be quickly generated, significantly improving the efficiency and data intuitiveness of high-precision pipeline quality inspection in industrial settings.

[0052] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A device for detecting the straightness of the inner hole of a vacuum tube, characterized in that, include: Pipe support (4), with a support space formed above the pipe support (4) for supporting the pipe to be tested; A mobile detection unit (2) is movably disposed within the support space; and, The detection component (3) is disposed at one end of the support space and is used to detect the moving detection unit (2).

2. The vacuum tube inner hole straightness detection device as described in claim 1, characterized in that, The motion detection unit (2) includes: The motion detection unit body (21) is configured to be movably disposed within the support space; A light-emitting target (23) is disposed at one end of the moving detection unit body (21) facing the detection component (3); The detection component (3) is configured to detect the displacement of the luminescent target (23).

3. The vacuum tube inner hole straightness detection device as described in claim 2, characterized in that, The moving detection unit body (21) is configured to circumferentially elastically abut against the inner wall of the pipeline (6) to be detected, and is coaxially arranged with the pipeline (6) to be detected.

4. The vacuum tube inner hole straightness detection device as described in claim 3, characterized in that, The circumferential surface of the moving detection unit body (21) is uniformly provided with multiple spring groups, each spring group including multiple guide springs (22), and the multiple guide springs (22) of each spring group are arranged in a ring array.

5. The vacuum tube inner hole straightness detection device as described in claim 4, characterized in that, The guide spring (22) extends from the body of the motion detection unit (21) and extends in a direction opposite to the direction of movement of the body of the motion detection unit (21).

6. The vacuum tube inner hole straightness detection device as described in claim 1, characterized in that, The moving detection unit (2) is provided with a traction component (11) at one end away from the detection component (3). The traction component (11) is configured to allow the moving detection unit (2) to slide from one end to the other end of the pipeline (6) to be detected.

7. The vacuum tube inner hole straightness detection device as described in claim 6, characterized in that, The traction assembly (11) includes a reel (114) with a traction line (115) wound on it. The end of the traction line (115) away from the reel (114) is fixedly connected to the motion detection unit (2).

8. The vacuum tube inner hole straightness detection device as described in claim 7, characterized in that, The output end of the reel (114) is coaxially arranged with the axis of the pipeline (6) to be tested.

9. The vacuum tube inner hole straightness detection device as described in claim 7, characterized in that, The traction assembly (11) also includes: A tensioning and retaining structure (12) is provided between the reel (114) and the pipeline (6) to be tested. The output end of the tensioning and retaining structure (12) is coaxially provided with the pipeline (6) to be tested. The traction line (115) pulls the moving detection unit (2) through the reel (114) and the tensioning and retaining structure (12).

10. The vacuum tube inner hole straightness detection device as described in claim 1, characterized in that, The detection component (3) includes: An industrial camera (31) is configured to detect the radial displacement of the moving detection unit (2).

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