Full-process installation tool table and method for strain gauge on dynamometer ring

Abstract

The invention discloses a full-process installation tool table for a strain gauge on a proving ring, and the tool table is characterized in that a rotating mechanism is arranged on a rack, and is used for rotating around a central axis and carrying out indexing positioning; the heating positioning table is arranged on the rotating mechanism and is provided with a profiling positioning structure and a heating unit; the profiling positioning structure is a groove matched with the outer contour of the proving ring, and the symmetric center line of the profiling positioning structure is coaxial with the central axis of the rotating mechanism, so that the proving ring rotates along with the rotating mechanism and is positioned; the heating unit is used for heating when the strain gauges are glued; the finger pressing tool is used for clamping a strain gauge pre-coated with an adhesive, and applying a pressing force perpendicular to a to-be-mounted position of the force measuring ring to the strain gauge, so as to bond the strain gauge; and the motion platform is used for adjusting the position and posture of the finger pressing tool, so that the clamped strain gauge reaches a preset pasting angle. According to the invention, the functions of positioning, aligning, pressing and pasting and curing are integrated, and the efficiency, the consistency and the reliability of pasting operation are obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of sensor manufacturing, specifically relating to a complete process installation tool table and method for strain gauges on a force measuring ring. Background Technology

[0002] In aero-engine rotor axial force testing, the force-measuring ring, as a core sensing element, directly affects the accuracy of the main thrust bearing's condition assessment and the overall reliability of the engine. Under extreme conditions of high temperature, high speed, and heavy load, micro-strain gauges precisely distributed on the force-measuring ring are responsible for converting micron-level deformation into electrical signals. Therefore, the bonding quality of the strain gauges—including the accuracy of their circumferential position, the uniformity of the adhesive layer thickness, and the integrity of the interface bonding—is a key technological foundation for ensuring flight safety and engine service life.

[0003] Currently, especially in complex applications involving multiple strain gauges, strain gauge bonding still heavily relies on manual operation by technicians. This traditional approach is severely incompatible with the high precision and consistency requirements of aerospace manufacturing, exhibiting three prominent bottlenecks: First, process consistency is difficult to guarantee; manual force application cannot achieve uniform pressing across the entire strain gauge area, easily leading to defects such as bubbles and warping, causing signal drift or even premature failure of the sensor under vibration and thermal cycling environments. Second, insufficient bonding precision; manual operation cannot guarantee the precise relative angles between multiple strain gauges, introducing significant bonding errors that severely affect the sensor's temperature compensation capability and output sensitivity, making it difficult to meet the ±10% high-precision testing requirements. Third, low production efficiency and reliability; large quality fluctuations and excessive reliance on operator experience fail to meet the stringent requirements of mass production and rapid repair.

[0004] While some auxiliary tooling attempts exist to improve this situation, their functions are often limited or have significant shortcomings. For example, the "rapid positioning and pasting device for resistance strain gauges" disclosed in Chinese patent CN222296656U, although capable of planar two-dimensional movement and elastic buffering, cannot adapt to the curved surface characteristics of the force ring and lacks circumferential rotation positioning and controllable flexible finger pressure functions. The "clamp for pasting strain gauges on Hopkinson square rods" disclosed in Chinese patent application CN118328064A utilizes laser ranging for axial positioning, but it relies on an elastic pad to provide pre-tightening force, resulting in uncontrollable pressure and an inability to guarantee uniform pressure application on the toroidal surface. Similarly, it struggles to meet the extremely high angular consistency requirements for pasting multiple gauges. Therefore, existing technologies lack a complete solution integrating precise circumferential positioning, controllable flexible pressing, and process heating curing, urgently requiring innovation to overcome the technological bottlenecks in the manufacturing of high-precision force rings. Summary of the Invention

[0005] In response to the above-mentioned defects or improvement needs of existing technologies, this invention proposes a full-process installation tool table and method for strain gauges on a force measuring ring, which realizes high-precision installation of strain gauges from positioning and clamping to bonding.

[0006] To achieve the above objectives, according to one aspect of the present invention, a complete installation tool table for strain gauges on a force ring is provided, comprising: frame; The rotating mechanism, mounted on the frame, is used for rotation and indexing positioning around the central axis; A heating positioning stage is mounted on a rotating mechanism and is used to rotate with the rotating mechanism around the central axis. The heating positioning stage is provided with a contour positioning structure and a heating unit. The contour positioning structure is a groove that matches the outer contour of the force measuring ring, and the symmetrical center line of the contour positioning structure is coaxial with the central axis of the rotating mechanism, so that the force measuring ring rotates and is positioned with the rotating mechanism. The heating unit is used for heating during strain gauge bonding. A finger pressure tool is used to clamp a strain gauge pre-coated with adhesive and apply a clamping force perpendicular to the position where the force measuring ring is to be installed to bond the strain gauge. The motion platform is mounted on the frame. The moving end of the motion platform is connected to the acupressure tool and is used to adjust the position and posture of the acupressure tool so that the clamped strain gauge reaches the preset bonding angle.

[0007] According to the above scheme, the acupressure tool includes: The strain gauge pressing and positioning seat includes a pressing plane at the bottom; the pressing plane has a contoured through hole extending to the top of the strain gauge pressing and positioning seat, and a wire groove communicating with the contoured through hole; the profile of the cross-section of the contoured through hole is consistent with the shape of the strain gauge, and the wire groove is used to accommodate the lead wire of the strain gauge, thereby clamping the strain gauge located in the contoured through hole. The piston drive tube has a hollow cavity; the bottom of the piston drive tube is connected to the top of the strain gauge pressing and positioning seat, so that the cavity is connected to the contour through hole; the top of the piston drive tube is connected to the moving end of the motion platform; the piston drive tube is provided with a drive carrier through hole on the side that is connected to the cavity. The finger-pressing piston rod passes through the contoured through hole and cavity to transmit the pressure of the driving carrier; A biomimetic finger pressure head, located at the bottom of the finger pressure piston rod, is used to compress a strain gauge located in a contoured through hole under the pressure.

[0008] According to the above scheme, the finger-pressure piston rod is a one-piece structure; wherein... The top of the finger-pressing piston rod is a piston section that is sealed and connected to the cavity, and the piston section is located below the through hole of the driving carrier; The middle part of the finger-pressing piston rod is a connecting rod section; The bottom of the finger pressure piston rod is a pressure head connecting section, which is connected to the bionic finger pressure head.

[0009] According to the above scheme, the bionic finger pressure head is a cuboid with six faces, five of which are planes and the sixth face is an outwardly protruding drum-shaped working surface; The drum-shaped working surface is used to compress the strain gauge. It is a smooth, continuous curved surface and is made of a material with flexible, elastic, and non-stick properties.

[0010] According to the above scheme, the heating positioning platform is equipped with an operation avoidance structure to provide operating space for the removal and placement of the force measuring ring; The operation avoidance structure has symmetrically opened notches, which are connected to the groove.

[0011] According to the above scheme, the heating positioning stage is also equipped with a temperature control module, which is used to control the power of the heating unit, thereby adjusting the temperature of the strain gauge bonding area within a preset range.

[0012] According to the above scheme, the heating unit is integrated inside the heating positioning stage and is at least one of a resistance heating film, a ceramic heating plate, or a heating rod.

[0013] According to the above scheme, the rotating mechanism is one of the following three structures: This includes a manually adjustable rotary indexing plate, which rotates via a worm gear drive. This includes a rotary platform driven by a servo motor, which achieves arbitrary angle control of the rotary platform through encoder feedback; This includes a rotary platform that uses a harmonic reducer and a torque motor for direct drive.

[0014] According to the above scheme, the motion platform is a three-degree-of-freedom motion platform, comprising: The X-axis linear motion module is used to achieve linear movement in the X-axis direction; the X-axis is parallel to the plane where the force measuring ring is located. The Rz-axis rotary motion module is installed on the moving end of the X-axis linear motion module to achieve rotation around the Z-axis, which is perpendicular to the plane of the force measuring ring. The Z-axis linear motion module is installed at the output end of the Rz-axis rotary motion module to achieve telescopic movement in the Z-axis direction.

[0015] According to another aspect of the present invention, a strain gauge installation method is provided using the strain gauge full-process installation tool table on the force ring, comprising the following steps: S1. Clamping the force-measuring ring: Place the force ring for attaching the strain gauge into the contour positioning structure of the heating positioning stage; S2. Install strain gauges: The strain gauge, pre-coated with adhesive, is clamped to the bottom of the acupressure tool; S3, Circumferential Positioning: According to the preset bridge assembly angle, the rotating mechanism is controlled to rotate around the central axis, driving the heating positioning stage and the force measuring ring to rotate synchronously, adjusting the installation position of the strain gauge on the force measuring ring to be directly below the finger pressure tool; S4. Alignment Adjustment: Control the motion platform and adjust the position and posture of the acupressure tool so that the clamped strain gauge reaches the preset bonding angle; S5. Perform pressing: Apply a clamping force perpendicular to the installation position to the strain gauge using a finger pressure tool to bond the strain gauge to the force measuring ring. S6. Heat curing: Maintain the clamping force and turn on the heating unit to cure the adhesive; S7. Reset and subsequent pasting: Reset the pressure tool and repeat steps S2-S6 to bond the next strain gauge until all strain gauges around the force ring are bonded.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The indexing positioning of the force measuring ring achieves precise positioning of the circumferential installation position through the rotary mechanism. The position and posture of the finger pressure tool are adjusted by the motion platform, so that the clamped strain gauge reaches the preset bonding angle. Then, the finger pressure tool applies a clamping force perpendicular to the installation position of the force measuring ring to bond the strain gauge. Finally, the heating unit in the heating positioning table is used. This invention integrates positioning, alignment, pressing and curing functions into one, reducing reliance on manpower and significantly improving the efficiency, consistency and reliability of the bonding operation, meeting the high standard manufacturing requirements of aerospace-grade sensors.

[0017] 2. The finger pressure tool employs a piston-driven mechanism, utilizing pneumatic or hydraulic pressure to apply pressure to the piston. Simultaneously, the biomimetic finger pressure head utilizes a drum-shaped working surface made of a flexible, elastic, and non-stick material. During pressing, the drum-shaped working surface first contacts the center of the strain gauge, and then the contact area expands uniformly outward along the curved contour, achieving a "progressive pressing from the center to the edge." This process orderly expels adhesive and air bubbles to the edges, ensuring a tight fit throughout the entire area and forming a uniformly thick adhesive layer. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a device structure provided in an embodiment of the present invention.

[0019] Figure 2This is a three-dimensional view of a device structure provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the rack structure provided in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the heating positioning stage structure provided in an embodiment of the present invention.

[0022] Figure 5 This is an exploded view of the acupressure tool structure provided in an embodiment of the present invention.

[0023] Figure 6 This is a bottom view of the strain gauge pressing and positioning seat provided in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the piston drive tube structure provided in an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the finger-pressing piston rod structure provided in an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the bionic finger pressure head structure provided in an embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the three-degree-of-freedom motion platform structure provided in an embodiment of the present invention.

[0028] In the picture: 1-Frame, 101-Base, 102-Column, 103-Beam; 2-Rotating mechanism; 3-Heating positioning stage, 301-Following positioning structure, 302-Operation avoidance structure; 4-Acupressure tool, 401-Strain gauge pressing and positioning seat, 4011-Pressing plane, 4012-Shaped through hole, 4013-Wire groove, 4014-First mounting base surface, 402-Piston drive tube body, 4021-Piston guide hole, 4022-Drive carrier through hole, 4023-Second mounting base surface, 403-Acupressure piston rod, 4031-Connecting rod section, 4032-Piston section, 4033-Sealing ring, 4034-Indenter connection section, 404-Bionic acupressure indenter, 4041-Drum-shaped working surface, 405-Air tube; 5-Motion platform, 501-X-axis linear motion module, 502-Guide axis, 503-Rz-axis rotary motion module. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] This invention aims to solve the technical bottlenecks of manual pasting of micro strain gauges on force rings in high-precision fields such as aero-engines, including uneven force application, difficulty in circumferential positioning, poor accuracy of bridge assembly angles, low efficiency, and insufficient consistency.

[0034] To achieve the above objectives, this embodiment provides a complete installation tool table for strain gauges on a force-measuring ring, such as... Figure 1 As shown, the device includes a frame 1, a rotating mechanism 2, a heating and positioning stage 3, a pressure point tool 4, and a motion platform 5. Through an automated system integrating precision mechanical positioning, biomimetic flexible pressure application, and controllable temperature control, it achieves high-quality, high-efficiency, and high-consistency strain gauge bonding. The tool table is vertically arranged. The rotating mechanism 2 drives the heating and positioning stage 3 and the clamped force ring to rotate 360° precisely around the vertical axis (Z-axis) to adjust the bonding position arbitrarily along the circumference of the force ring. The motion platform 5 drives the pressure point tool 4 below it to achieve linear movement in the horizontal (X-axis) and vertical (Z-axis) directions, as well as rotational movement around the Z-axis (Rz-axis), to precisely adjust the spatial position and orientation of the pressure point tool relative to the surface of the force ring. Through the coordinated operation of the rotating mechanism 2 and the motion platform 5, multiple strain gauges can be bonded sequentially and accurately to the circumferential surface of the force ring.

[0035] like Figures 1 to 3 As shown, the frame 1 serves as the supporting skeleton of the entire device, specifically including a base 101, a column 102, and a crossbeam 103. The base 101 forms the bottom support structure of the device and has an area for mounting the rotating mechanism 2; the column 102 is vertically fixed to one side of the base 101 and extends upward; the crossbeam 103 is horizontally fixed to the top of the column 102, and has an area below it for mounting the motion platform 5.

[0036] In some embodiments, the rack may employ a cantilever structure (e.g. Figure 1 and Figure 3 As shown in the figure, a C-type structure or a gantry structure can also be used. The core requirement is to provide stable support and leave room for the operation of moving parts.

[0037] The rotating mechanism 2 is mounted on the base 101 of the frame 1. It is mainly used to drive the heating positioning stage 3 and the force measuring instrument to rotate and index around its central axis in a precise 360° manner, ensuring the precise relative angle of multiple strain gauges in the circumferential direction.

[0038] There are many ways to implement the rotating mechanism 2, mainly including: (a) Option 1 (manual): The manual fine-tuning rotary indexing plate is used to achieve rotation through worm gear transmission, and its self-locking characteristics are used to accurately position and maintain the angle.

[0039] (ii) Option 2 (automatic): A precision rotary platform driven by a servo motor is used to achieve programmed control of any angle through encoder feedback.

[0040] (III) Option 3 (High-precision automatic): The harmonic reducer and torque motor are directly driven to achieve high-precision and high-rigidity rotary positioning.

[0041] The heating positioning platform 3 is mounted on the rotating mechanism 2 to precisely position and support the force-measuring ring, while providing a stable and controllable heating environment during the pressing process to accelerate adhesive curing. Figure 2 and Figure 4 As shown, the heating and positioning platform is equipped with a contour positioning structure 301 and a heating unit. The contour positioning structure 301 is a groove that mates with the outer contour of the force measuring ring. The groove cross-section is U-shaped, V-shaped, or arc-shaped, and the center line of symmetry of the contour positioning structure 301 is strictly coaxial with the central axis of the rotating mechanism 2, achieving radial positioning and bearing of the force measuring ring, allowing the force measuring ring to rotate and be positioned with the rotating mechanism 2. The heating unit, integrated inside the positioning platform, is used for heating during strain gauge bonding and can be a resistance heating film, ceramic heating element, or heating rod.

[0042] In some embodiments, an operation avoidance structure 302 may be included to provide operating space for the picking and placing of the force ring. For example... Figure 4 As shown, the operation avoidance structure 302 has symmetrically opened notches, which are connected to the groove. The notches can be semi-circular notches, U-shaped notches, or through grooves.

[0043] In some embodiments, in order to provide a stable and controllable temperature, a temperature control module may also be included, comprising temperature sensing elements such as thermocouples / resistance temperature detectors and a PID control unit / intelligent temperature control chip, for controlling the power of the heating unit, thereby achieving closed-loop precise control of the working surface temperature.

[0044] The finger pressure tool 4 is used to clamp the strain gauge pre-coated with adhesive and apply a clamping force perpendicular to the installation position of the force measuring ring to the strain gauge for bonding. Its function is to clamp the strain gauge and apply a vertical, uniform, and controllable clamping force to it. Figure 5 As shown, the acupressure tool 4 includes a strain gauge pressing and positioning seat 401, a piston drive tube 402, an acupressure piston rod 403, and a bionic acupressure head 404.

[0045] like Figure 5 and Figure 6As shown, the strain gauge pressing and positioning seat 401 includes a bottom pressing surface 4011 and a top first mounting base surface 4014. The pressing surface 4011 has a contoured through-hole 4012 extending to the top of the strain gauge pressing and positioning seat 4011, and a wire groove 4013 communicating with the contoured through-hole 4012. The profile of the cross-section of the contoured through-hole 4012 conforms to the shape of the strain gauge, and the wire groove 4013 is used to accommodate the strain gauge leads, thereby clamping the strain gauge located in the contoured through-hole 4012. All surfaces are covered with an anti-stick coating such as Teflon.

[0046] like Figure 5 and Figure 7 As shown, the piston drive tube 402 has a hollow cavity serving as a piston guide hole 4021. The bottom of the piston drive tube 402 is connected to the top of the strain gauge pressing and positioning seat 401, allowing the cavity to communicate with the contoured through hole. In this embodiment, the bottom of the piston drive tube 402 is a second mounting base surface 4023, which is flanged and connected to the first mounting base surface 4014 at the top of the strain gauge pressing and positioning seat 401. The top of the piston drive tube 402 is connected to the moving end of the motion platform 5. The piston drive tube 402 has a drive carrier through hole 4022 on its side, communicating with the piston guide hole 4021, for introducing a drive carrier. In this embodiment, the drive carrier is air, and an air pipe 405 is connected to the drive carrier through hole 4022 to introduce air. The drive carrier can also be a liquid, providing hydraulic pressure.

[0047] like Figure 5 and Figure 8 As shown, the finger-pressure piston rod 403 passes through the contoured through hole 4012 and the piston guide hole 4021 to transmit the pressure of the driving carrier, such as pneumatic or hydraulic pressure. The finger-pressure piston rod 403 is a one-piece structure. The top of the finger-pressure piston rod 403 is a piston section 4032 that is sealed and connected to the piston guide hole 4021, and the piston section 4032 is located below the driving carrier through hole 4022. The middle part of the finger-pressure piston rod 403 is a connecting rod section 4031. The bottom of the finger-pressure piston rod 403 is a pressure head connecting section 4034, which is connected to the bionic finger-pressure head 404.

[0048] A biomimetic finger pressure head 404 is disposed at the bottom of the finger pressure piston rod 403, and is used to compress a strain gauge located in the contoured through hole 4012 under the pressure. Figure 5 and Figure 9 As shown, the biomimetic finger pressure head 404 is a cuboid with six faces, five of which are planes, and the sixth face is an outwardly protruding drum-shaped working surface 4041. The drum-shaped working surface 4041 is used to compress the strain gauge and is a smooth, continuous curved surface (such as a sphere, cylinder, or ellipsoid). It is made of a material with flexible, elastic, and non-stick properties, such as medical-grade silicone rubber, fluorinated rubber, or Teflon-coated modified silicone.

[0049] The working principle of the biomimetic finger pressure head 404 is as follows: During pressing, it first contacts the center of the strain gauge, and then the contact area expands outward evenly along the curved surface contour, achieving "progressive pressing from the center to the edge". This process can orderly discharge adhesive and air bubbles to the edge, ensuring tight adhesion throughout the entire area and forming a uniform adhesive layer.

[0050] Assembly and Working Principle: After the strain gauge pressing and positioning seat 401 is connected to the piston drive tube 402, its internal contoured through hole 4012 communicates with the piston guide hole 4021. The piston section 4031 of the finger-pressing piston rod 403 is located in the piston guide hole 4021, and its pressure head connecting section 4034 and the bionic finger-pressing pressure head 404 are located in the contoured through hole 4012. Compressed gas enters from the drive carrier through hole 4022, pushing the finger-pressing piston rod 403 downward, driving the bionic finger-pressing pressure head 404 to extend out from the contoured through hole 4012, and performing bionic pressing on the strain gauge placed on the pressing plane 4011.

[0051] The motion platform 5 is mounted on the frame. The moving end of the motion platform 5 is connected to the acupressure tool 4 and is used to adjust the position and posture of the acupressure tool 4 so that the clamped strain gauge reaches the preset bonding angle.

[0052] In some embodiments, the motion platform 5 is a three-degree-of-freedom motion platform used to precisely adjust the spatial position (X, Z) and attitude (Rz) of the acupressure tool 4 relative to the force measuring ring. For example... Figure 2 and Figure 10 As shown, the specific structure of the motion platform 5 includes an X-axis linear motion module 501, an Rz-axis rotational motion module 503, and a Z-axis linear motion module.

[0053] The X-axis linear motion module 501 is used to achieve linear movement in the X-axis direction; the X-axis is parallel to the plane where the force measuring ring is located. In some embodiments, the X-axis linear motion module 501 is mounted on the crossbeam 103 to achieve horizontal movement, and can be a manual slide table or a motor-driven linear module.

[0054] The Rz-axis rotary motion module 503 is installed at the moving end of the X-axis linear motion module to achieve rotation around the Z-axis, which is perpendicular to the plane of the force measuring ring. The Rz-axis rotary motion module 503 can be a manual indexing table or an electric rotary table.

[0055] The Z-axis linear motion module is installed at the output end of the Rz-axis rotary motion module to achieve telescopic movement in the Z-axis direction. In this embodiment, vertical movement is achieved by a directional telescopic mechanism consisting of the guide shaft 502 and the keyway on the piston drive tube 402. Alternatively, an independent linear module can be used.

[0056] As another aspect of the present invention, this embodiment also provides a strain gauge installation method using the strain gauge full-process installation tool table on the force ring, including the following steps: S1. Clamping the force ring: Place the force ring for which the strain gauge is to be bonded into the contour positioning structure of the heating positioning stage to ensure stable positioning.

[0057] S2. Install the strain gauge: Clamp the strain gauge, which is pre-coated with adhesive, to the bottom of the finger pressure tool.

[0058] Specifically, the strain gauge pre-coated with adhesive is placed on the pressing surface of the finger pressure tool, so that it is embedded in the contoured through hole, and the strain gauge wire is passed through the wire groove.

[0059] S3. Circumferential positioning: Based on the preset bridge assembly angle, the rotating mechanism is controlled to rotate around the central axis, driving the heating positioning platform and the force measuring ring to rotate synchronously, adjusting the installation position of the strain gauge on the force measuring ring to be directly below the finger pressure tool.

[0060] S4. Alignment Adjustment: Control the motion platform to adjust the position and posture of the acupressure tool so that the clamped strain gauge reaches the preset bonding angle.

[0061] Specifically, the relative distance and horizontal position between the finger pressure tool and the surface of the force ring are adjusted by linear movement along the X and Z axes; the orientation of the strain gauge is adjusted by rotation along the Rz axis to achieve the ideal bonding angle.

[0062] S5. Perform pressing: Apply a pressing force perpendicular to the installation position to the strain gauge using a finger pressure tool to bond the strain gauge to the force ring.

[0063] Specifically, compressed gas at a set pressure is introduced into the finger pressure tool through an air tube, driving the finger pressure piston rod and the bionic finger pressure head to move downwards. The drum-shaped working surface first forms a line contact with the strain gauge, and then the pressure expands along its width to form a strip-shaped contact surface, orderly expelling the adhesive and air bubbles to both sides, ensuring a tight fit throughout the entire area.

[0064] S6. Heating and curing: Maintain the clamping force, turn on the heating unit, and maintain the set temperature for a period of time to accelerate the curing of the adhesive.

[0065] S7. Resetting and subsequent bonding: After curing, reset the finger pressure tool and repeat steps S2-S6 to bond the next strain gauge until all strain gauges in the circumferential direction of the force ring are bonded.

[0066] Force rings for aero-engines often require multiple strain gauges to be attached circumferentially to form a bridge, and the relative angular accuracy of these gauges directly affects the sensor's temperature compensation performance and output sensitivity. This invention, through the coordinated control of a rotating mechanism and a motion platform, enables precise 360° rotation of the force ring and accurate adjustment of the pressure point tool along the X and Z axes, as well as its rotation around the Z axis. This system can precisely adjust the attachment position of each strain gauge to be directly below the pressure point tool, ensuring its orientation matches a preset angle. This achieves high-precision circumferential positioning and bridge consistency among multiple strain gauges, meeting the stringent angular error requirements of aerospace-grade force rings.

[0067] This invention integrates a constant-temperature heating positioning stage, providing a continuous and stable heating environment during the pressing process, promoting rapid and uniform curing of the adhesive, and shortening the process cycle. Combined with a pneumatically driven finger pressure tool, it enables controllable and repeatable application of pressing force, avoiding variations in force applied manually. The entire process allows for the sequential and continuous pasting of multiple strain gauges, significantly improving pasting efficiency, yield, and batch consistency, and meeting the needs of mass production and rapid repair of aero-engines.

[0068] This invention utilizes a biomimetic drum-shaped finger pressure head design. Its smooth, continuous curved surface first contacts the center of the strain gauge during the pressing process, and then the pressure expands uniformly outward along the curved surface, achieving a progressive pressing from the center to the edge. This flexible pressure application method effectively eliminates residual air bubbles within the adhesive layer, forming a uniformly thick adhesive layer with a complete interface. This significantly improves the bonding strength and durability between the strain gauge and the force ring surface, thereby enhancing the signal stability and service life of the sensor under high-temperature and high-vibration environments.

[0069] This invention employs a modular design, including a quick-assembly and disassembly finger pressure tool and a positioning platform with an operation avoidance structure, facilitating the installation, alignment, and removal of the force ring and strain gauge. The pneumatic pressing system precisely controls the pressing force by adjusting the gas pressure, adapting to the process requirements of strain gauges and adhesives of different sizes. A temperature control module (such as PID temperature control) ensures a stable and reliable heating process, preventing degradation of the adhesive layer performance due to overheating or uneven temperature. The overall operation is intuitive and flexible, reducing over-reliance on operator skills and improving process controllability and reproducibility.

[0070] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0071] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0072] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tool table for the complete installation of strain gauges on a force-measuring ring, characterized in that: include: frame; The rotating mechanism, mounted on the frame, is used for rotation and indexing positioning around the central axis; A heating positioning stage is mounted on a rotating mechanism and is used to rotate with the rotating mechanism around the central axis. The heating positioning stage is provided with a contour positioning structure and a heating unit. The contour positioning structure is a groove that matches the outer contour of the force measuring ring, and the symmetrical center line of the contour positioning structure is coaxial with the central axis of the rotating mechanism, so that the force measuring ring rotates and is positioned with the rotating mechanism. The heating unit is used for heating during strain gauge bonding. A finger pressure tool is used to clamp a strain gauge pre-coated with adhesive and apply a clamping force perpendicular to the position where the force measuring ring is to be installed to bond the strain gauge. The motion platform is mounted on the frame. The moving end of the motion platform is connected to the acupressure tool and is used to adjust the position and posture of the acupressure tool so that the clamped strain gauge reaches the preset bonding angle.

2. The full-process installation tool table for strain gauges on the force measuring ring according to claim 1, characterized in that: The acupressure tool includes: The strain gauge pressing and positioning seat includes a pressing plane at the bottom; the pressing plane has a contoured through hole extending to the top of the strain gauge pressing and positioning seat, and a wire groove communicating with the contoured through hole; the profile of the cross-section of the contoured through hole is consistent with the shape of the strain gauge, and the wire groove is used to accommodate the lead wire of the strain gauge, thereby clamping the strain gauge located in the contoured through hole. The piston drive tube has a hollow cavity; the bottom of the piston drive tube is connected to the top of the strain gauge pressing and positioning seat, so that the cavity is connected to the contour through hole; the top of the piston drive tube is connected to the moving end of the motion platform; the piston drive tube is provided with a drive carrier through hole on the side that is connected to the cavity. The finger-pressing piston rod passes through the contoured through hole and cavity to transmit the pressure of the driving carrier; A biomimetic finger pressure head, located at the bottom of the finger pressure piston rod, is used to compress a strain gauge located in a contoured through hole under the pressure.

3. The full-process installation tool table for strain gauges on the force measuring ring according to claim 2, characterized in that: The finger-pressing piston rod is a one-piece structure; wherein... The top of the finger-pressing piston rod is a piston section that is sealed and connected to the cavity, and the piston section is located below the through hole of the driving carrier; The middle part of the finger-pressing piston rod is a connecting rod section; The bottom of the finger pressure piston rod is a pressure head connecting section, which is connected to the bionic finger pressure head.

4. The strain gauge installation tool table for the force measuring ring according to claim 2, characterized in that: The biomimetic finger pressure head is a cuboid with six faces, five of which are flat and the sixth face is a drum-shaped working surface that bulges outward. The drum-shaped working surface is used to compress the strain gauge. It is a smooth, continuous curved surface and is made of a material with flexible, elastic, and non-stick properties.

5. The full-process installation tool table for strain gauges on the force measuring ring according to claim 1, characterized in that: The heating positioning platform is equipped with an operation avoidance structure to provide operating space for the removal and placement of the force measuring ring; The operation avoidance structure has symmetrically opened notches, which are connected to the groove.

6. The strain gauge installation tool table for the force measuring ring according to claim 1, characterized in that: The heating positioning stage is also equipped with a temperature control module, which is used to control the power of the heating unit, thereby adjusting the temperature of the strain gauge bonding area within a preset range.

7. The full-process installation tool table for strain gauges on the force measuring ring according to claim 1 or 6, characterized in that: The heating unit is integrated inside the heating positioning platform and is at least one of a resistance heating film, a ceramic heating plate, or a heating rod.

8. The strain gauge installation tool table for the force measuring ring according to claim 1, characterized in that: The rotating mechanism is one of the following three structures: This includes a manually adjustable rotary indexing plate, which rotates via a worm gear drive. This includes a rotary platform driven by a servo motor, which achieves arbitrary angle control of the rotary platform through encoder feedback; This includes a rotary platform that uses a harmonic reducer and a torque motor for direct drive.

9. The full-process installation tool table for strain gauges on the force measuring ring according to claim 1, characterized in that: The motion platform is a three-degree-of-freedom motion platform, comprising: The X-axis linear motion module is used to achieve linear movement in the X-axis direction; the X-axis is parallel to the plane where the force measuring ring is located. The Rz-axis rotary motion module is installed on the moving end of the X-axis linear motion module to achieve rotation around the Z-axis, which is perpendicular to the plane of the force measuring ring. The Z-axis linear motion module is installed at the output end of the Rz-axis rotary motion module to achieve telescopic movement in the Z-axis direction.

10. A strain gauge installation method using the strain gauge installation tool table on the force measuring ring as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Clamping the force-measuring ring: Place the force ring for attaching the strain gauge into the contour positioning structure of the heating positioning stage; S2. Install strain gauges: The strain gauge, pre-coated with adhesive, is clamped to the bottom of the acupressure tool; S3, Circumferential Positioning: According to the preset bridge assembly angle, the rotating mechanism is controlled to rotate around the central axis, driving the heating positioning stage and the force measuring ring to rotate synchronously, adjusting the installation position of the strain gauge on the force measuring ring to be directly below the finger pressure tool; S4. Alignment Adjustment: Control the motion platform and adjust the position and posture of the acupressure tool so that the clamped strain gauge reaches the preset bonding angle; S5. Perform pressing: Apply a clamping force perpendicular to the installation position to the strain gauge using a finger pressure tool to bond the strain gauge to the force measuring ring. S6. Heat curing: Maintain the clamping force and turn on the heating unit to cure the adhesive; S7. Reset and subsequent pasting: Reset the pressure tool and repeat steps S2-S6 to bond the next strain gauge until all strain gauges around the force ring are bonded.

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