CN-122014730-A - Full-process mounting tool table and method for strain gauge on force measuring ring

CN122014730ACN 122014730 ACN122014730 ACN 122014730ACN-122014730-A

Abstract

The invention discloses a full-process mounting tool table for strain gages on a force measuring ring, which is characterized in that a rotating mechanism is arranged on a frame and used for rotating around a central axis and indexing and positioning, a heating positioning table is arranged on the rotating mechanism and provided with a profiling positioning structure and a heating unit, the profiling positioning structure is a groove matched with the outer contour of the force measuring ring, the symmetrical central line of the profiling positioning structure is coaxial with the central axis of the rotating mechanism, so that the force measuring ring rotates and is positioned along with the rotating mechanism, the heating unit heats when the strain gages are glued, a finger pressing tool is used for clamping the strain gages pre-coated with adhesive and applying a pressing force perpendicular to the position to be mounted of the force measuring ring to glue the strain gages, and a moving platform is used for adjusting the position and the gesture of the finger pressing tool so that the clamped strain gages reach a preset pasting angle. The invention integrates the functions of positioning, aligning, pressing and pasting and solidifying, and obviously improves the efficiency, consistency and reliability of pasting operation.

Inventors

LIU JUN
SHAN WENYAN
Yang Feibing
SONG HAN
YAO YUANJIAN
Wei Songhan
LUO XIN

Assignees

武汉理工大学
中国航发四川燃气涡轮研究院

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (10)

1. The full-process mounting tool table for the strain gauge on the force measuring ring is characterized by comprising the following components: A frame; the rotating mechanism is arranged on the frame and used for rotating around the central axis and indexing and positioning; The strain gauge comprises a strain gauge, a heating positioning table, a heating unit and a strain gauge, wherein the heating positioning table is arranged on a rotating mechanism and used for rotating around the central axis along with the rotating mechanism; The finger pressing tool is used for clamping the strain gauge pre-coated with the adhesive, applying a pressing force perpendicular to the position where the force measuring ring is to be installed to the strain gauge, and performing strain gauge bonding; The moving platform is arranged on the frame, the moving end of the moving platform is connected with the finger pressing tool and used for adjusting the position and the posture of the finger pressing tool, so that the clamped strain gauge reaches a preset pasting angle.
2. The full-process mounting tool table for strain gauges on a load ring of claim 1, wherein said finger press tool comprises: The strain gauge pressing positioning seat comprises a pressing plane at the bottom, wherein the pressing plane is provided with a profiling through hole extending to the top of the strain gauge pressing positioning seat and a wire groove communicated with the profiling through hole, the profile of the cross section of the profiling through hole is consistent with the profile of the strain gauge, and the wire groove is used for accommodating a lead of the strain gauge so as to clamp the strain gauge positioned in the profiling through hole; A piston driving tube body having a hollow cavity; the bottom of the piston driving pipe body is connected with the top of the strain gauge pressing positioning seat so that the cavity is communicated with the profiling through hole; the finger-pressure piston compression bar is arranged in the profiling through hole and the cavity in a penetrating way and is used for transmitting the pressure of the driving carrier; The bionic finger-pressing head is arranged at the bottom of the finger-pressing piston pressing rod and is used for pressing the strain gauge positioned in the profiling through hole under the pressure.
3. The full-process mounting tool table for strain gauges on a load ring according to claim 2, wherein the finger-pressure piston plunger is of an integral structure, wherein, The top of the finger-pressure piston compression bar is a piston section which is in sealing connection with the cavity, and the piston section is positioned below the driving carrier through hole; The middle part of the finger-pressure piston compression bar is a connecting rod section; the bottom of the finger-pressing piston compression bar is a pressure head connecting section which is connected with the bionic finger-pressing pressure head.
4. The full-process mounting tool table for strain gauges on a force measuring ring of claim 2, wherein the bionic finger pressing head is a cuboid with six faces, five faces of the cuboid are planes, and the sixth face is a drum-shaped working face protruding outwards; The drum-shaped working surface is used for extruding the strain gauge and is a smooth continuous curved surface, and a material with flexibility, elasticity and anti-sticking characteristics is adopted.
5. The full-process mounting tool table for strain gauges on a force measuring ring of claim 1, wherein the heating positioning table is provided with an operation avoidance structure for providing an operation space for taking and placing the force measuring ring; the operation avoidance structure is a symmetrically arranged notch, and the notch is communicated with the groove.
6. The full-process mounting tool table for strain gages on a force measuring ring of claim 1, wherein the heating positioning table is further provided with a temperature control module for controlling the power of the heating unit so as to adjust the temperature of the bonding area of the strain gages within a preset range.
7. The full-process mounting tool table for strain gauges on a load ring of claim 1 or 6, wherein the heating unit is integrated inside the heating positioning table and is at least one of a resistance heating film, a ceramic heating plate or a heating rod.
8. The full-process mounting tool table for strain gauges on a load ring of claim 1, wherein the rotating mechanism is one of the following three structures: the device comprises a manual fine adjustment rotary index plate, wherein the index plate realizes rotation through worm and gear transmission; The control of any angle of the rotary platform is realized through encoder feedback by adopting a rotary platform driven by a servo motor; The device comprises a rotary platform directly driven by a harmonic reducer and a torque motor.
9. The full-process mounting tool table for strain gauges on a load ring of claim 1, wherein the motion platform is a three-degree-of-freedom motion platform comprising: The X-axis linear motion module is used for realizing linear movement in the X-axis direction, and the X-axis is parallel to the plane where the force measuring ring is positioned; The Rz axis rotary motion module is arranged at the moving end of the X axis linear motion module to realize rotation around a Z axis, and the Z axis is perpendicular to the plane where the force measuring ring is positioned; And the Z-axis linear motion module is arranged at the output end of the Rz-axis rotary motion module, so that the telescopic movement in the Z-axis direction is realized.
10. A strain gage mounting method implemented by using the strain gage on load ring full-flow mounting tool table according to any one of claims 1-9, comprising the steps of: S1, clamping a force measuring ring: placing a force measuring ring to be stuck with a strain gauge in a profiling positioning structure of a heating positioning table; s2, installing a strain gauge: Clamping the strain gauge pre-coated with the adhesive at the bottom of the finger pressing tool; S3, circumferential positioning: According to a preset bridge angle, the heating positioning table and the force measuring ring are driven to synchronously rotate by controlling the rotating mechanism to rotate around the central axis, and the position to be mounted of the strain gauge on the force measuring ring is adjusted to be right below the finger pressure tool; s4, aligning and adjusting: Controlling a motion platform, and adjusting the position and the gesture of the finger pressing tool to enable the clamped strain gauge to reach a preset pasting angle; s5, performing pressing and pasting: Applying a pressing force perpendicular to the position to be installed to the strain gauge through a finger pressing tool, and bonding the strain gauge and the force measuring ring; s6, heating and curing: Maintaining the pressing force, starting a heating unit, and solidifying the adhesive; s7, resetting and subsequent pasting: Resetting the finger pressing tool, repeating the steps S2-S6, and cementing the next strain gage until cementing of all strain gages around the force measuring ring is completed.

Description

Full-process mounting tool table and method for strain gauge on force measuring ring Technical Field The invention belongs to the field of sensor manufacturing, and particularly relates to a full-flow mounting tool table and method for strain gauges on a force measuring ring. Background In the axial force test of the aero-engine rotor, the force measuring ring is used as a core sensing element, and the measuring precision of the force measuring ring is directly related to the working condition evaluation accuracy and the reliability of the whole machine of the main thrust bearing. Under the extreme working conditions of high temperature, high rotating speed and large load, the micro strain gauge which is precisely distributed on the force measuring ring body is responsible for converting micron-sized deformation into an electric signal, so that the pasting quality of the strain gauge, including the accuracy of the circumferential position of the strain gauge, the uniformity of the thickness of a glue layer and the integrity of interface combination, is a key process foundation for guaranteeing flight safety and the service life of an engine. At present, in the field, especially in the complex application scene of a multi-sheet group bridge, the pasting operation of the strain gauge still depends on the pure manual operation of technicians seriously. The traditional mode is seriously inconsistent with the requirements of high precision and high consistency of aviation manufacturing, and has three outstanding bottlenecks that firstly, the process consistency is difficult to ensure, the defects of bubble, edge tilting and the like are extremely easy to generate due to the fact that the whole area of a strain gauge cannot be uniformly pressed by manual force application, the sensor has signal drift and even early failure in a vibration and thermal cycle environment, secondly, the assembly accuracy is insufficient, the accurate relative angle among a plurality of strain gauges cannot be ensured by manual operation, obvious assembly error can be introduced, the temperature compensation capability and output sensitivity of the sensor are seriously influenced, the high-precision test requirement of +/-10% is difficult to meet, thirdly, the production efficiency and the reliability are low, the quality fluctuation is large, and the strict requirements of batch manufacturing and quick maintenance cannot be met due to excessive dependence on the experience of operators. Although some auxiliary tools exist to try to improve this situation, their function is often single or the presence of a significantly shorter plate. For example, although the "quick positioning and pasting device for a resistance strain gauge" disclosed in chinese patent CN222296656U can realize planar two-dimensional movement and elastic buffering, it cannot adapt to the curved surface characteristics of a force measuring ring, and does not have the functions of circumferential rotational positioning and controllable flexible finger pressure. The fixture applied to the Hopkinson square bar pasting strain gauge disclosed in the Chinese patent application CN118328064A realizes axial positioning by utilizing laser ranging, but relies on an elastic cushion layer to provide pretightening force, the pressure is uncontrollable, uniform pressing on an annular curved surface cannot be ensured, and the requirement of extremely high angle consistency of multiple pasting sheets is difficult to meet. Therefore, the prior art lacks a full-flow solution capable of integrating precise circumferential positioning, controllable flexible pressing and process heating and curing, and needs to be innovated to break through the process bottleneck of high-precision force measuring ring manufacturing. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a full-flow mounting tool table and method for strain gauges on a force measuring ring, which realize full-flow high-precision mounting of the strain gauges from positioning, clamping to cementing. To achieve the above object, according to one aspect of the present invention, there is provided a full-process mounting tool for strain gauges on a load ring, comprising: A frame; the rotating mechanism is arranged on the frame and used for rotating around the central axis and indexing and positioning; The strain gauge comprises a strain gauge, a heating positioning table, a heating unit and a strain gauge, wherein the heating positioning table is arranged on a rotating mechanism and used for rotating around the central axis along with the rotating mechanism; The finger pressing tool is used for clamping the strain gauge pre-coated with the adhesive, applying a pressing force perpendicular to the position where the force measuring ring is to be installed to the strain gauge, and performing strain gauge bonding; The moving platform is arranged on the frame, the moving end of