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CN-121977828-A - Loading-controllable swing hinge friction moment measuring device

CN121977828ACN 121977828 ACN121977828 ACN 121977828ACN-121977828-A

Abstract

The invention provides a loading-controllable swing hinge friction moment measuring device which comprises a measuring structure and a driving loading structure, wherein the measuring structure and the driving loading structure are fixed with a base, the measuring structure comprises an information acquisition mechanism and a clamping mechanism used for clamping a lug on the fixed side of a hinge to be measured, the driving loading structure comprises a loading structure, a driving structure for driving the loading structure to horizontally swing, a height adjusting structure for adjusting the driving structure to move up and down, and a force transmission rod clamped on a loading head of the loading structure. The loading structure is rigidly connected with the swing rod in the adjusting driving structure, the movable side lug of the hinge to be detected, which is fixed on the force transmission rod, horizontally swings along with the swing rod relative to the fixed side lug of the hinge to be detected, which is fixed on the clamping mechanism, and the real-time accurate adjustment and compensation of the load are realized, the direction of the load is ensured to always and accurately point to the rotation center of the hinge through the force transmission rod, the measurement precision is improved, the measuring device is suitable for measuring the friction moment of the swing hinge with different overall dimensions, and the application range is widened.

Inventors

  • ZHAN JIANGHUI
  • LI TUANJIE
  • ZENG ZIJIE
  • DONG HANGJIA

Assignees

  • 西安电子科技大学

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. The friction moment measuring device for the swing hinge with controllable loading comprises a base (1), a measuring structure (2) and a driving loading structure (3), and is characterized in that the measuring structure (2) comprises an information acquisition mechanism (21) and a clamping mechanism (22) for clamping a lug on the fixed side of the hinge to be tested, the driving loading structure (3) comprises a loading structure (33), a driving structure (32) for driving the loading structure (33) to horizontally swing, a height adjusting structure (31) for adjusting the driving structure (32) to move up and down, and a force transmission rod (34) clamped on a loading head of the loading structure (33), and the loading structure (33) is used for controlling the load applied by the force transmission rod (34) with the output end fixed to the lug on the movable side of the hinge to be tested.
  2. 2. The measuring device according to claim 1, wherein the clamping mechanism (22) comprises a bending plate (221), two movable clamping plates (223) and a pressure regulating bolt (224) for applying pressure to the bending plate, one ends of the two movable clamping plates (223) are lapped on the upper edge of the side face of the bending plate (221), and the other ends clamp the lug of the hinge fixing side to be measured on the bottom face of the bending plate (221).
  3. 3. The measuring device according to claim 2, wherein the information acquisition mechanism (21) comprises a measuring instrument shell (211) fixed on the base (1), a force sensor integrated in the shell and used for acquiring torque information of the clamping mechanism (22), and a signal processing unit, wherein the force sensor main body is a cylinder, a rectangular force arm rod is rigidly connected in the radial direction of the cylinder and can integrally rotate around the axis of the cylinder, and the tail end plane of the force arm rod is attached to a strain gauge sensing surface fixed on the measuring instrument shell (211).
  4. 4. The measuring device according to claim 3, wherein the top of the measuring instrument shell (211) is provided with a square groove (212), the bottom of the square groove (212) is fixedly connected with the cylinder of the force sensor main body coaxially, the square groove (212) is supported in the measuring instrument shell (211) through a bearing, and the square groove (212) is detachably connected with a square boss (222) arranged on the bottom surface of the bending plate (221).
  5. 5. The measuring device according to claim 1, wherein the height adjusting structure (31) comprises a supporting frame (311) with a lower beam fixed with the base (1), two guide shafts (312) fixed between an upper beam and a lower beam of the supporting frame (311), a sliding table (313) arranged on the guide shafts (312), and a screw rod (314) arranged on the upper beam and the lower beam of the supporting frame (311) and positioned between the two guide shafts (312), and the sliding table (313) is driven to slide up and down along the two guide shafts (312).
  6. 6. The measuring device according to claim 5, wherein the drive structure (32) comprises a support (321) fixed on the sliding table (313), a first servo motor (322) connected with a pinion (323) by a transmission shaft fixed on the support (321), and a large gear (324) meshed with the pinion (323), A swing rod (325) is fixed at the center of the bottom surface of the large gear (324), and the swing rod (325) swings back and forth relative to the rotating shaft of the tested hinge through the driving of a first servo motor (322).
  7. 7. The measuring device according to claim 6, wherein the swing rod (325) has a swing center line coincident with a rotation center axis of the hinge to be measured fixed to the chuck (22).
  8. 8. The measuring device according to claim 5, wherein the loading structure (33) comprises a mounting base (331) with a U-shaped cross section, a sliding groove for fixing the free end of the swing rod (325) is arranged at the upper end of a side arm of the mounting base (331) facing the height adjusting structure, an opening groove for accommodating a loading head (333) is arranged at the lower end of the mounting base, an adjusting bolt (332) for adjusting the clamping force of the loading head (333) is arranged on the opening groove, the loading head (333) comprises two V-shaped blocks with opposite openings, a second servo motor (334) is fixed on the other side arm of the mounting base (331), a fine adjustment platform (335) which is driven by the second servo motor (334) and can linearly move along the direction perpendicular to the two side arms is arranged between the two side arms of the mounting base (331), and a thrust meter (336) is arranged on the fine adjustment platform (335).
  9. 9. The measuring device according to claim 8, characterized in that the fine adjustment platform (335) is provided with a linear guide between it and the mounting base (331).
  10. 10. The measuring device according to claim 8, wherein the force transmission rod (34) is clamped between the loading heads (333) in the loading structure (33) at one end, and is provided with a cylinder with an open slot for fixing the movable side lug of the hinge to be measured at the other end, wherein the end surface of the force transmission rod is in spherical contact with the push rod of the thrust meter (336).

Description

Loading-controllable swing hinge friction moment measuring device Technical Field The invention belongs to the technical field of hinge mechanical property measurement, and relates to a swing hinge friction moment measuring device with controllable loading, which can be used in the fields of a satellite expandable mechanism, a space mechanical arm, a precise instrument and the like. Background The hinge is a core kinematic pair for realizing the rotation function of the mechanism and mainly comprises a rotary hinge, a swinging hinge, a flexible hinge, a unfolding locking hinge and the like according to functions and configurations, wherein the swinging hinge is widely applied to the fields of satellite unfolding mechanisms, space mechanical arms, precise instruments and the like. The swing hinge mainly comprises a hinge shaft, a connecting lug, a bearing or a bushing and a fastener, wherein the connecting lug is respectively connected with a fixed part and a movable part of the structure. Due to the relative movement requirements of the radial matching surfaces between the hinge shaft and the bearing and the bush of the swing hinge, the machining assembly tolerance and the like, gaps exist between the hinge shaft and the radial matching surfaces between the bearing and the bush, and the contact state between the inner matching surfaces of the hinge is unstable. The contact state between the matching surfaces is unstable in the movement process of the swing hinge, the normal collision and tangential sliding of the shaft, the bearing and the bushing occur on the matching surfaces, the coupling of the normal contact force and the friction coefficient on the contact points of the shaft, the bearing and the bushing can generate time-varying friction moment, and obvious nonlinear fluctuation and hysteresis of the internal friction moment are caused. The unstable phenomenon of the friction moment can cause uneven driving resistance, so that the mechanism is blocked in motion and poor in-place precision, the randomness of the friction moment is difficult to predict and compensate, the abrasion of the contact surface is aggravated, the size and the shape of a gap are further changed, a malignant cycle with more unstable friction moment is formed, the on-track reliability and the service life of the mechanism are affected, and the fatal problems of mechanism failure, unfolding failure and the like can occur more seriously. Therefore, the accurate measurement and characterization of the friction moment between the shaft and the matching surfaces of the bearing and the bush in the movement process of the swing hinge become key problems for improving the reliability of the space unfolding mechanism. In order to compensate friction torque, control high precision motion and predict service life of a swing hinge in an actual application process, related measuring devices are currently available, for example, patent document of application publication number CN217227952U discloses a test device for measuring hinge friction torque, which comprises a double ear component, a cylindrical split double ear right piece, a double ear left piece, a driving cover, a left/right fixed bushing and a sliding bushing, wherein the double ear left piece and the right piece are connected through screws to form an integral double ear component structure, coaxial main bolt mounting holes are arranged on left and right ears of the double ear left piece and the right piece, the left/right fixed bushing is respectively assembled on the left and right ears, the sliding bushing is arranged on the right fixed bushing, the driving cover is arranged on any side of the left and right piece, the driving hole is arranged in the center position of the driving cover, torque is applied through the driving device which is adapted to the driving hole, the single ear component comprising a single ear component and a bearing is arranged between two ears of the double ear component, the double ear component and the double ear component is assembled into an integral structure through a main bolt and a main nut, the double ear component comprises a left and a right housing and a left and a right housing, the left and a right housing are arranged on the outer side of the double ear test bearing component through the double ear test component. The device can measure the friction moment between the inner ring of the hinge bearing and the surface of the bolt and the end face of the bearing, and can simulate the clamping working condition of the bearing at the same time, so as to obtain the starting moment of the hinge for overcoming the friction between the inner ring of the bearing and the pin shaft and the bush, and solve the engineering technical test of the friction moment of the aircraft hinge with the key part adopting the double-way sliding passage design structure under the two working conditions of normal bearing and clamping. But its radial load is staticall