High-precision neutron super-mirror conical catheter assembly device and method based on flexible air bag

Abstract

The application discloses a high-precision neutron super-mirror conical duct assembly device and method based on a flexible air bag, belongs to the technical field of precise assembly of neutron optical elements, and comprises a high-flatness reference table, a high-precision right-angle positioning metal clamp block, a duct front and rear port fine adjustment mechanism and a flexible air bag, takes the fixed duct lower wall as a unified assembly reference, provides uniform external jacking force through the internal flexible air bag, and realizes the attitude fine adjustment of each glass substrate in cooperation with the external fine adjustment mechanism. During assembly, closed-loop adjustment is formed by adopting three-coordinate measurement, and the left wall, the right wall and the upper wall are calibrated in sequence, combined with phased cementing and solidification, and precision monitoring is performed during the whole assembly process. The application can effectively reduce the local stress of the glass substrate, the assembly error is controlled within 20 microns, the tooling is modularly designed, quick changeover is realized, high precision, high stability and high production efficiency are considered, and the application is suitable for batch manufacturing of multiple specifications of neutron super-mirror conical ducts.

Description

Technical Field

[0001] This invention relates to the field of precision assembly technology for neutron optical components, and in particular to a high-precision neutron superscope conical duct assembly device and method based on a flexible airbag. Background Technology

[0002] The neutron super-mirror guide tube is a core optical component of neutron scattering experimental devices, neutron imaging systems, and neutron focusing systems. Its inner wall is coated with a multilayer neutron super-mirror film, utilizing the Bragg reflection principle of neutrons under grazing incidence conditions to achieve efficient neutron beam transmission. With the development of high-flux neutron sources and advanced neutron scattering technologies, the requirements for geometrical precision, positional accuracy, and long-term stability of the neutron guide tube are constantly increasing. The assembly error of a single section of the guide tube typically needs to be controlled within the tens of micrometers; otherwise, the neutron reflection angle will deviate from the design value, significantly reducing beam transmission efficiency.

[0003] The conical neutron superscope guide tube achieves neutron beam compression and focusing through a tapered cross-section structure along the axial direction. Compared with a constant cross-section guide tube, its assembly process not only requires controlling the spacing and angle of the four glass substrates, but also ensuring that the tapered contour is continuously and symmetrically distributed along the guide tube axis. The assembly dimensions are more numerous and the precision control is more difficult.

[0004] Currently, the assembly of neutron microscope guide tubes largely relies on large-scale precision measuring equipment and specialized rigid tooling, involving multiple measurements, manual adjustments, and calibrations to complete positioning and assembly. Existing technologies generally suffer from the following shortcomings: First, the tooling lacks versatility; guide tubes of different diameters and tapers require redesigned, matching rigid tooling, resulting in long changeover cycles and high manufacturing costs. Second, the assembly process is cumbersome; measurement, fitting, and adjustment steps are highly dependent on operator experience, leading to low assembly efficiency and difficulty in ensuring consistency. Third, rigid clamping and rigid internal supports can easily create stress concentrations in localized areas of the glass substrate, increasing the risk of assembly deformation and even glass damage, affecting the long-term stability of the guide tube. Fourth, existing solutions primarily focus on achieving assembly accuracy, lacking effective control over accuracy drift during the bonding and curing process, and are difficult to adapt to the mass production needs of multi-specification products.

[0005] Therefore, there is an urgent need to develop a neutron super mirror conical guide assembly technology that can take into account high precision, low stress, high efficiency and strong versatility, in order to meet the industrialization development needs of advanced neutron optical equipment. Summary of the Invention

[0006] The purpose of this invention is to provide a high-precision neutron mirror conical conduit assembly device and method based on a flexible airbag. Based on a unified assembly benchmark, it adopts a method of coordinating the uniform outer top of the internal flexible airbag with the external mechanical fine-tuning mechanism, combined with three-coordinate measurement closed-loop feedback and staged curing monitoring. While achieving micron-level assembly accuracy, it reduces local stress on the glass substrate, improves the versatility of tooling and assembly efficiency, and is suitable for the mass production of multi-specification neutron mirror conical conduits.

[0007] To achieve the above objectives, this invention provides a high-precision neutron ultrasound mirror conical catheter assembly device based on a flexible airbag, comprising a high-flatness reference platform, a high-precision right-angle positioning metal block, a fine-tuning mechanism for the front and rear ports of the catheter, and a flexible airbag. The high-flatness reference platform is used to support the lower wall of the catheter and serve as a unified horizontal assembly reference for the conical catheter assembly. The high-precision right-angle positioning metal block is fixedly disposed on the high-flatness reference platform, forming a mutually perpendicular positioning reference with the high-flatness reference platform, used for lateral positioning and lateral limitation of the lower wall of the catheter. The fine-tuning mechanism for the front and rear ports of the catheter is respectively disposed on the outer side of the front and rear ports of the conical catheter, used for fine-tuning the position and orientation of the left wall, right wall, and upper wall of the catheter. The flexible airbag is disposed in the inner cavity of the front and rear ports of the conical catheter. After inflation, the flexible airbag forms surface contact with the inner wall of the catheter and applies a uniform and continuous external force to the inner wall of the catheter, cooperating internally and externally with the fine-tuning mechanism for the front and rear ports of the catheter.

[0008] Preferably, the fine-tuning mechanism at the anterior and posterior ends of the catheter includes an adjustment body and a left fine-tuning setwire, a right fine-tuning setwire, and an upper fine-tuning setwire mounted on the adjustment body; the left and right fine-tuning setwires are arranged opposite each other in the horizontal direction and act on the outer surfaces of the left and right walls of the catheter, respectively, to adjust the horizontal position and orientation of the two side walls; the upper fine-tuning setwire is arranged in the vertical direction and acts on the outer surface of the upper wall of the catheter to adjust the vertical position and orientation of the upper wall.

[0009] Preferably, the flexible airbag is a closed airbag body. In the uninflated state, its outer dimensions are smaller than the inner diameter of the corresponding conduit, allowing it to be inserted or removed from the conduit port. In the inflated state, its outer dimensions are larger than the inner diameter of the corresponding conduit, forming a complete fit with the inner wall of the conduit. The external force can be adjusted by regulating the air pressure inside the airbag, ensuring that the conduit wall is subjected to uniform and stable force during assembly, adjustment, and bonding curing.

[0010] Preferably, the high-precision right-angle positioning metal block, the fine-tuning mechanism for the front and rear ends of the catheter, and the flexible airbag all adopt a modular disassembly structure, while the remaining assembly mechanisms remain universal, for rapid changeover assembly of catheters of various specifications.

[0011] This invention also discloses a method for assembling a high-precision neutron ultrasound mirror conical catheter based on a flexible airbag, specifically including the following steps: S1. Establish a unified assembly benchmark: Place the lower wall of the conduit on a high-flatness benchmark platform, and use high-precision right-angle positioning metal blocks to position and limit the lower wall of the conduit, so that the lower wall of the conduit remains fixed as the assembly benchmark throughout the process; S2. Substrate installation and initial positioning: Install the left wall, right wall and upper wall of the conduit in sequence, install the fine adjustment mechanism at the front and rear ports of the conduit and complete the initial positioning, and at the same time, insert flexible airbags into the inner cavity of the front and rear ports of the conduit and inflate them so that the four glass substrates form a conical inner cavity of the conduit. S3. Three-coordinate closed-loop fine adjustment: Taking the lower wall of the catheter as the reference, the three-coordinate measuring equipment is used to collect spatial point sets and fit planes on the inner surfaces of the left, right and upper walls of the catheter in sequence, calculate the corresponding dimensional parameters and shape and position parameters, and adjust the fine adjustment mechanism of the front and rear ports of the catheter according to the test results. After multiple tests and adjustments, the closed-loop fine adjustment ensures that the dimensional and shape and position accuracy of the front and rear ports of the catheter meets the preset tolerance requirements. S4. First-stage adhesive bonding and curing monitoring: Keep the assembly and adjustment state unchanged, apply adhesive to the unshielded area of ​​the conduit joint for the first stage of fixation; during the curing process of the adhesive layer, the flexible airbag remains in the inflated external top state and the fine adjustment mechanism remains in the positioning state. Use a three-coordinate measuring equipment to detect the conduit accuracy parameters regularly and compare them with the benchmark detection data after fine adjustment to ensure stable assembly accuracy during the curing process. S5. Tooling Removal and Final Inspection of Adhesive Application: After the first stage adhesive layer reaches the predetermined strength, the internal air pressure of the flexible airbag is released in stages and the airbag and external tooling are removed. The second stage of adhesive application and curing is carried out on the un-adhesive joint area. After curing, a final inspection of all parameters is carried out to obtain the finished high-precision neutron mirror cone-shaped conical guide tube.

[0012] Preferably, the closed-loop fine-tuning in step S3 is performed step by step in the following order; S31. Using the lower wall of the catheter as a reference, adjust the posture of the left wall and check the perpendicularity between the left wall and the lower wall. Adjust through closed loop to meet the preset tolerance requirements. S32. Using the lower wall and the already adjusted left wall as a common reference, adjust the posture of the right wall, and check the perpendicularity of the right wall to the lower wall, the distance between the left and right walls, and the parallelism. Adjust through closed loop until all parameters meet the tolerance requirements. S33. Using the lower wall, left wall, and right wall as a common reference, adjust the posture of the upper wall, detect the verticality of the upper wall and the left and right walls, and the distance between the upper and lower walls, and adjust through closed loop until all parameters meet the standards.

[0013] Preferably, in step S3, the coordinate measuring machine uses the least squares method to fit the collected spatial point set to a reference plane and calculates the diameter, parallelism and perpendicularity parameters of the conduit. After all the fine-tuning is completed, while keeping the outer top of the airbag and the tooling in position, the spatial point set of all inner surfaces of the front and rear ports of the conduit is collected at one time and the full accuracy parameters are calculated as the benchmark detection data for subsequent curing monitoring.

[0014] Preferably, in step S4, the measured accuracy parameters are compared with the benchmark test data for each test. If all parameters are within the preset tolerance range, the curing continues. If any parameter exceeds the tolerance range, the current bonding process is terminated, the tooling and conduit are removed, and the assembly is performed again.

[0015] Preferably, the outer edges of the joints of the glass substrates in the conduit are pre-processed with chamfers; in the first stage of adhesive application, adhesive is applied only to the chamfered areas that are not covered by the fine-tuning mechanism and positioning blocks, and the tooling contact areas are left uncoated; the adhesive is applied continuously along the chamfered areas using a soft, thin adhesive needle to evenly fill the bonding area; in the second stage of adhesive replenishment, adhesive is applied to the reserved uncoated areas to form a continuous and complete bonding structure for the entire joint.

[0016] Preferably, the adhesive used is a two-component epoxy resin adhesive, and the curing environment conditions are a temperature of 20-24℃ and a relative humidity of 40%-60%. In step S5, when removing the flexible airbag, a step-by-step depressurization method is adopted. After each depressurization, the accuracy parameters of the conduit are checked. After confirming that there is no accuracy deviation, the depressurization continues until the airbag is completely deflated and then removed from the conduit port.

[0017] Therefore, the present invention employs the above-mentioned high-precision neutron ultrasound mirror conical catheter assembly device and method based on a flexible airbag, which has the following technical effects: (1) The present invention constructs a unified assembly coordinate system by using a high-flatness reference platform and a high-precision right-angle positioning metal block, and uses the lower wall of the conduit as a fixed reference throughout the process to achieve the step-by-step transfer of accuracy, avoid the cumulative error caused by multiple reference conversions, and significantly improve the assembly consistency and repeatability of conduits in different batches.

[0018] (2) The present invention uses a flexible airbag to replace the traditional rigid internal support tooling, and uses surface contact force to replace point / line contact force, which effectively reduces local stress concentration on the glass substrate, reduces assembly deformation and glass damage risk, and improves the long-term stability of the conduit.

[0019] (3) The fine-tuning mechanism of the present invention, together with the three-coordinate measurement, forms a closed-loop adjustment system. Through step-by-step reference transfer and iterative convergence, the diameter error and form and position error of the guide tube are stably controlled within 20μm, which meets the requirements of high-precision neutron optical system.

[0020] (4) The present invention performs periodic precision monitoring throughout the adhesive curing process to promptly detect and address precision drift caused by adhesive shrinkage; combined with a graded unloading method, it avoids elastic rebound caused by stress mutation, effectively ensuring the final precision and long-term stability of the finished conduit.

[0021] (5) The combination of rigid positioning and flexible external top in this invention reduces complex clamping fixtures and repeated adjustment steps, has a high degree of process standardization, reduces reliance on operator experience, and significantly shortens the assembly cycle of a single conduit.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the high-precision neutron superscope conical duct assembly device based on a flexible airbag according to the present invention; Figure 2 This is a schematic diagram of the micro-adjustment mechanism at the front and rear ends of the catheter in the high-precision neutron superscope conical catheter assembly device based on a flexible airbag according to the present invention. Figure 3 This is a cross-sectional schematic diagram of the glass substrate joint chamfer in the high-precision neutron superscope conical duct assembly device based on a flexible airbag according to the present invention; Figure 4 This invention relates to a high-precision neutron ultrasound mirror conical duct assembly device based on a flexible airbag. Figure 3 Enlarged view of point A in the middle; Figure 5 This is a flowchart of the process flow of the high-precision neutron superscope conical duct assembly method based on a flexible airbag according to the present invention. Figure 6 This is a diagram showing the test results of the surface shape error of the glass substrate in the high-precision neutron superscope conical duct assembly device based on the flexible airbag of the present invention. Figure 7 This is a schematic diagram of the planar fitting result of the inner diameter of the front port of the conical catheter in the high-precision neutron superscope conical catheter assembly device based on the flexible airbag of the present invention. Figure 8 This is a schematic diagram of the planar fitting result of the inner diameter of the rear port of the conical catheter in the high-precision neutron superscope conical catheter assembly device based on the flexible airbag of the present invention. Figure 9 This is a statistical chart showing the changes in dimensional and geometric tolerances during the assembly and curing process of the high-precision neutron ultrasound mirror conical conduit assembly method based on flexible airbags in this invention.

[0024] Figure Labels 1. High-flatness reference platform; 2. Lower wall of catheter; 3. Left wall of catheter; 4. Right wall of catheter; 5. Upper wall of catheter; 6. High-precision right-angle positioning metal block; 7. Flexible airbag; 8. Fine-tuning mechanism for front and rear ends of catheter; 9. Left fine-tuning set screw; 10. Upper fine-tuning set screw; 11. Right fine-tuning set screw; 12. Chamfered seam. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] like Figure 1 As shown, a high-precision neutron superscope conical duct assembly device based on a flexible airbag mainly consists of a high-flatness reference platform 1, a high-precision right-angle positioning metal block 6, a flexible airbag 7, and two sets of fine-tuning mechanisms for the front and rear ends of the duct 8.

[0028] In this embodiment, the high-flatness reference platform 1 is made of marble, and its flatness is better than 0.005mm / m after precision machining. It serves as a unified horizontal reference for the entire assembly process, supporting the lower wall 2 of the conduit and ensuring that all glass substrates are on the same reference plane. Four high-precision right-angle positioning metal blocks 6 are provided, divided into two groups and fixed on the high-flatness reference platform 1. One group of two blocks is fixed after three-coordinate calibration, and their positioning sides perpendicular to the platform together form an axial reference plane, which is tightly fitted with one side of the lower wall 2 of the conduit, establishing an axial positioning reference for the tapered conduit. The other group of two blocks is fixed to the other side of the lower wall 2 of the conduit, closely fitting the side of the lower wall to achieve lateral limiting and prevent displacement or attitude deviation of the lower wall 2 of the conduit during assembly. The lower wall 2 of the conduit remains fixed throughout the assembly process, serving as the reference for all wall adjustments.

[0029] The fine-tuning mechanisms 8 at the front and rear ports of the catheter are respectively arranged on the outside of the front and rear ports of the tapered catheter. The structure of each fine-tuning mechanism 8 is as follows: Figure 2As shown, the device includes an adjustment body and three fine-tuning screws mounted on the body: a left fine-tuning screw 9, an upper fine-tuning screw 10, and a right fine-tuning screw 11. The left and right fine-tuning screws 9 and 11 are arranged horizontally opposite each other, acting on the outer surfaces of the left wall 3 and right wall 4 of the catheter, respectively, to adjust the horizontal position and tilt of the two side walls, controlling the distance between the left and right walls, parallelism, and perpendicularity between the side walls and the lower wall. The upper fine-tuning screw 10 is arranged vertically, acting on the outer surface of the upper wall 5 of the catheter, to adjust the vertical position and tilt of the upper wall, controlling the distance between the upper and lower walls and perpendicularity between the upper wall and the left and right walls. Each fine-tuning screw uses a precision threaded pair to achieve micron-level feed adjustment.

[0030] The flexible airbag 7 is a closed airbag body, with two in total, placed inside the front and rear ports of the conical conduit, respectively. The airbag body is made of a flexible material that does not react with the neutron mirror coating, and its shape matches the inner contour of the conical conduit. In the uninflated state, the airbag's dimensions are smaller than the corresponding inner diameter of the conduit, allowing for smooth insertion and removal from the conduit port without damaging the inner wall neutron mirror coating. After inflation, the airbag expands, forming full-surface contact with the inner walls of the left wall 3, right wall 4, upper wall 5, and lower wall 2 of the conduit, applying a uniform and continuous external force to the inner walls. The magnitude of the external force can be flexibly adjusted by regulating the internal air pressure of the airbag, creating a force balance with the clamping force of the external fine-tuning screws. This ensures that each glass substrate maintains a stable stress state during adjustment and curing, avoiding localized stress concentration.

[0031] In this embodiment, the positioning block, the adapter components of the fine-tuning mechanism, and the flexible airbag all adopt a modular and detachable design. For neutron mirror tapered guide tubes of different diameters and tapers, only the above-mentioned components of the corresponding size need to be replaced. The reference platform and the measurement and adjustment process remain universal, enabling rapid changeover production.

[0032] Based on the above assembly device, the assembly process of the high-precision neutron mirror cone-shaped guide tube in this embodiment is as follows: Figure 5 As shown, the specific steps are as follows: S1. Establish unified assembly standards Before assembly, the glass substrate is prepared: float glass is used as the substrate, and after precision polishing with a high-precision surface grinder and repeated-frequency ultrasonic cleaning, a Ni / Ti neutron mirror multilayer film is deposited on the inner wall; the surface waviness error of the finished substrate is better than 1.2×10⁻⁶. -4 The surface shape accuracy (PV value) is better than 50 μm, the reflectivity meets the design requirements, and the substrate surface shape error test results are as follows: Figure 6 As shown. The lower wall 2 of the conduit is a rectangular base plate, and the left wall 3 and right wall 4 of the conduit are trapezoidal base plates, which are adapted to the conical profile of the conduit.

[0033] Place the lower wall 2 of the conduit on the high flatness reference platform 1, and adjust its position so that one side of it is in contact with the positioning surface of a set of pre-calibrated high-precision right-angle positioning metal blocks 6; after confirming the coaxiality, fasten the set of blocks to the platform; then install the two right-angle positioning metal blocks 6 on the other side, and fasten them after they are close to the other side of the lower wall 2 of the conduit, thus completing the full degree of freedom limit of the lower wall 2 of the conduit, making it a fixed reference throughout the entire process.

[0034] S2. Substrate mounting and initial positioning The left wall 3 and the right wall 4 of the catheter are placed on the left and right sides above the lower wall 2 of the catheter in sequence, and the upper wall 5 of the catheter is placed above the left and right walls. The four base plates together form the inner cavity structure of the conical catheter.

[0035] Fine-tuning mechanisms 8 are installed at the front and rear ports of the conduit, respectively. Each fine-tuning screw is adjusted to make initial contact with the outer surface of the corresponding glass substrate, thereby achieving initial positioning of the movable substrate.

[0036] Two flexible airbags 7 are inserted into the corresponding positions inside the catheter from the front and rear ports, respectively. Low-pressure gas is injected to make the airbags slightly expand and initially fit against the inner wall of the catheter, providing initial external force and completing the coarse positioning of the tapered catheter.

[0037] S3. Three-coordinate closed-loop fine-tuning Using a coordinate measuring machine, fine-tuning was performed step by step in the order of left wall, right wall, and top wall, with each step forming an independent closed loop; Left wall attitude fine adjustment: With the fixed lower wall 2 of the catheter as the reference, adjust the left fine adjustment set screw 9 at the front and rear ports to drive the left wall 3 of the catheter to produce a horizontal micro displacement; collect the spatial point set of the inner surface of the lower wall 2 and the left wall 3 using a three-coordinate system, and fit the two reference planes respectively using the least squares method to calculate the perpendicularity error of the two planes; adjust the set screw feed amount in the opposite direction according to the error value, and repeat the detection and adjustment until the perpendicularity of the left wall and the lower wall meets the preset tolerance requirements.

[0038] Right wall attitude fine adjustment: Using the lower wall 2 of the catheter and the already adjusted left wall 3 of the catheter as a common reference, adjust the right fine adjustment set screw 11 at the front and rear ports to drive the right wall 4 of the catheter to produce a horizontal micro displacement; collect the point set of the inner surface of the right wall 4 with a three-coordinate system and fit the plane, and simultaneously calculate three parameters: the perpendicularity between the right wall and the lower wall, the distance between the left and right walls, and the parallelism between the left and right walls; adjust the set screw together according to the error of the three parameters, and iterate until all parameters meet the design tolerance.

[0039] Fine-tuning of the upper wall posture: Using the lower wall 2, left wall 3, and right wall 4 of the catheter as a common reference, adjust the upper fine-tuning set screw 10 at the front and rear ports to drive the upper wall 5 of the catheter to produce a vertical micro-displacement; collect the point set of the inner surface of the upper wall 5 with a three-coordinate system and fit the plane, and simultaneously calculate three parameters: the perpendicularity between the upper wall and the left wall, the perpendicularity between the upper wall and the right wall, and the distance between the upper and lower walls; iteratively adjust until all parameters meet the standards.

[0040] After all wall surface fine-tuning is completed, while maintaining the inflated outer top of the airbag and the tooling positioning, a set of spatial points on all inner surfaces of the front and rear ports of the conduit is collected in one go. All dimensional and geometric parameters are fitted and calculated, and archived as benchmark test data for comparison and monitoring during subsequent curing processes. In this embodiment, after fine-tuning, the diameter and geometric errors of the tapered conduit are controlled within 20 μm. The port diameter plane fitting results are as follows: Figures 7 to 8 As shown.

[0041] S4. First Stage Adhesion and Curing Monitoring Maintaining the current assembly and adjustment state, proceed with the first stage of adhesive application. For example... Figures 3 to 4 As shown, the outer edges of the joints of each glass substrate are pre-processed with a chamfer 12 to increase the bonding area, improve the adhesive wetting effect, and enhance the bonding strength. A soft, slender adhesive needle is used to continuously and evenly apply adhesive along the chamfer 12 area, ensuring the adhesive fully fills the chamfered area. During the application process, the contact area between the fine-tuning mechanism and the positioning block is avoided; this area is left uncoated to prevent the adhesive from affecting the positioning accuracy of the tooling after curing. The adhesive application is performed in segments and symmetrically to avoid uneven deformation caused by shrinkage of the adhesive layer on one side.

[0042] The adhesive used is a two-component epoxy resin, and the curing environment is controlled at a temperature of 20-24℃ and a relative humidity of 40%-60%. During the curing process, the flexible airbag 7 remains in an inflated external position, and the fine-tuning mechanism 8 at the front and rear ends of the conduit remains in a fixed position.

[0043] Curing monitoring was conducted according to preset milestones, with monitoring times of 1 hour, 2 hours, 4 hours, 12 hours, 24 hours, and 48 hours after adhesive application. For each monitoring, a full set of data points on the inner surface of the conduit was collected, and accuracy parameters were calculated and compared with baseline monitoring data. If all parameters remained within tolerance, curing continued; if any parameter exceeded the allowable error range, the bonding process was immediately terminated, the tooling and conduit were removed, and the conduit was reassembled. The tolerance variation statistics for this embodiment are as follows: Figure 9 As shown, all tolerances remained stable within 20μm throughout the entire cycle.

[0044] S5. Tooling removal and final inspection after glue application Once the first-stage adhesive layer reaches the predetermined strength and accuracy is stable, remove the tooling and apply additional adhesive. Release the internal air pressure of the flexible airbag 7 until it is completely deflated, then remove it from the conduit port.

[0045] Subsequently, the fine-tuning mechanism 8 and the high-precision right-angle positioning metal clip 6 at the front and rear ports were removed in sequence. The second stage of adhesive application was then performed on the joint areas that were obscured by the tooling in the first stage and had not been coated with adhesive, creating a continuous and complete adhesive structure along the entire joint. After the adhesive application was completed, it was allowed to cure completely under the same temperature and humidity conditions.

[0046] After curing, a coordinate measuring machine is used to perform a final inspection of all parameters of the finished conduit. The inspection items include the diameter of the front and rear ports, the distance between the left and right walls, the distance between the upper and lower walls, the parallelism of the side walls, and the perpendicularity between the walls. All inspection items meet the design tolerance requirements, which means that the assembly of the high-precision neutron mirror conical conduit is complete.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-precision neutron ultrasound mirror cone-shaped duct assembly device based on a flexible airbag, characterized in that: The system includes a high-flatness reference platform, a high-precision right-angle positioning metal block, a fine-tuning mechanism for the front and rear ends of the catheter, and a flexible airbag. The high-flatness reference platform supports the lower wall of the catheter and serves as a unified horizontal assembly reference for the assembly of the tapered catheter. The high-precision right-angle positioning metal block is fixedly mounted on the high-flatness reference platform, forming a mutually perpendicular positioning reference with the high-flatness reference platform, used for lateral positioning and lateral limitation of the lower wall of the catheter. The fine-tuning mechanism for the front and rear ends of the catheter is respectively located on the outside of the front and rear ends of the tapered catheter, used for fine-tuning the position and orientation of the left, right, and upper walls of the catheter. The flexible airbag is respectively located in the inner cavity of the front and rear ends of the tapered catheter. After inflation, the flexible airbag forms surface contact with the inner wall of the catheter and applies a uniform and continuous external force to the inner wall of the catheter, cooperating internally and externally with the fine-tuning mechanism for the front and rear ends of the catheter.

2. The high-precision neutron ultrasound mirror conical duct assembly device based on a flexible airbag according to claim 1, characterized in that: The fine-tuning mechanism at the front and rear ends of the catheter includes an adjustment body and a left fine-tuning setwire, a right fine-tuning setwire, and an upper fine-tuning setwire mounted on the adjustment body. The left and right fine-tuning setwires are arranged opposite each other in the horizontal direction and act on the outer surfaces of the left and right walls of the catheter, respectively, to adjust the horizontal position and orientation of the two side walls. The upper fine-tuning setwire is arranged in the vertical direction and acts on the outer surface of the upper wall of the catheter to adjust the vertical position and orientation of the upper wall.

3. The high-precision neutron ultrasound mirror conical duct assembly device based on a flexible airbag according to claim 1, characterized in that: The flexible airbag is a closed airbag body. When it is not inflated, its outer size is smaller than the inner diameter of the corresponding conduit, so it can be inserted or removed from the conduit port. When it is inflated, its outer size is larger than the inner diameter of the corresponding conduit, so it fits the inner wall of the conduit perfectly. The external force can be adjusted by adjusting the air pressure inside the airbag, so that the force on the conduit wall remains uniform and stable during the assembly, adjustment and bonding curing process.

4. The high-precision neutron ultrasound mirror conical duct assembly device based on a flexible airbag according to claim 1, characterized in that: The high-precision right-angle positioning metal clip, the fine-tuning mechanism for the front and rear ends of the catheter, and the flexible airbag all adopt a modular disassembly structure, while the remaining assembly mechanisms remain universal, enabling rapid assembly and replacement of catheters of various specifications.

5. A method for assembling a high-precision neutron ultrasound mirror conical duct based on a flexible airbag, using the assembly device described in any one of claims 1 to 4, characterized in that... Includes the following steps: S1. Establish a unified assembly benchmark: Place the lower wall of the conduit on a high-flatness benchmark platform, and use high-precision right-angle positioning metal blocks to position and limit the lower wall of the conduit, so that the lower wall of the conduit remains fixed as the assembly benchmark throughout the process; S2. Substrate installation and initial positioning: Install the left wall, right wall and upper wall of the conduit in sequence, install the fine adjustment mechanism at the front and rear ports of the conduit and complete the initial positioning, and at the same time, insert flexible airbags into the inner cavity of the front and rear ports of the conduit and inflate them so that the four glass substrates form a conical inner cavity of the conduit. S3. Three-coordinate closed-loop fine adjustment: Taking the lower wall of the catheter as the reference, the three-coordinate measuring equipment is used to collect spatial point sets and fit planes on the inner surfaces of the left, right and upper walls of the catheter in sequence, calculate the corresponding dimensional parameters and shape and position parameters, and adjust the fine adjustment mechanism of the front and rear ports of the catheter according to the test results. After multiple tests and adjustments, the closed-loop fine adjustment ensures that the dimensional and shape and position accuracy of the front and rear ports of the catheter meets the preset tolerance requirements. S4. First-stage adhesive bonding and curing monitoring: Keep the assembly and adjustment state unchanged, apply adhesive to the unshielded area of ​​the conduit joint for the first stage of fixation; during the curing process of the adhesive layer, the flexible airbag remains in the inflated external top state and the fine adjustment mechanism remains in the positioning state. Use a three-coordinate measuring equipment to detect the conduit accuracy parameters regularly and compare them with the benchmark detection data after fine adjustment to ensure stable assembly accuracy during the curing process. S5. Tooling Removal and Final Inspection of Adhesive Application: After the first stage adhesive layer reaches the predetermined strength, the internal air pressure of the flexible airbag is released in stages and the airbag and external tooling are removed. The second stage of adhesive application and curing is carried out on the un-adhesive joint area. After curing, a final inspection of all parameters is carried out to obtain the finished high-precision neutron mirror cone-shaped conical guide tube.

6. The high-precision neutron ultrasound mirror cone-shaped catheter assembly method based on a flexible airbag according to claim 5, characterized in that: The closed-loop fine-tuning in step S3 is performed step by step in the following order; S31. Using the lower wall of the catheter as a reference, adjust the posture of the left wall and check the perpendicularity between the left wall and the lower wall. Adjust through closed loop to meet the preset tolerance requirements. S32. Using the lower wall and the already adjusted left wall as a common reference, adjust the posture of the right wall, and check the perpendicularity of the right wall to the lower wall, the distance between the left and right walls, and the parallelism. Adjust through closed loop until all parameters meet the tolerance requirements. S33. Using the lower wall, left wall, and right wall as a common reference, adjust the posture of the upper wall, detect the verticality of the upper wall and the left and right walls, and the distance between the upper and lower walls, and adjust through closed loop until all parameters meet the standards.

7. The high-precision neutron ultrasound mirror cone-shaped duct assembly method based on a flexible airbag according to claim 5, characterized in that: In step S3, the coordinate measuring machine uses the least squares method to fit the collected spatial point set to the reference plane and calculates the diameter, parallelism and perpendicularity parameters of the conduit. After all the fine-tuning is completed, while keeping the outer top of the airbag and the tooling in position, the spatial point set of all inner surfaces of the front and rear ports of the conduit is collected at one time and the full accuracy parameters are calculated as the benchmark detection data for subsequent curing monitoring.

8. The high-precision neutron ultrasound mirror cone-shaped duct assembly method based on a flexible airbag according to claim 5, characterized in that: In step S4, the measured accuracy parameters are compared with the benchmark test data for each test. If all parameters are within the preset tolerance range, the curing continues. If any parameter exceeds the tolerance range, the current bonding process is terminated, the tooling and conduit are removed, and the assembly is performed again.

9. The high-precision neutron ultrasound mirror cone-shaped duct assembly method based on a flexible airbag according to claim 5, characterized in that: The outer edges of the joints of the glass substrates in the conduit are pre-processed with chamfers; the first stage of adhesive application is only applied to the chamfered areas that are not covered by the fine-tuning mechanism and positioning blocks, and the tooling contact areas are left uncoated. The first stage involves applying adhesive using a soft, thin glue needle along the chamfered area to ensure the adhesive evenly fills the bonding area. The second stage involves applying adhesive to the reserved un-adhesive areas to create a continuous and complete bonding structure along the entire joint.

10. The high-precision neutron ultrasound mirror conical duct assembly method based on a flexible airbag according to claim 5, characterized in that: The bonding uses a two-component epoxy resin adhesive, and the curing environment conditions are a temperature of 20-24℃ and a relative humidity of 40%-60%.

Images