CN112067216B - Rigidity testing device and rigidity testing method for aero-engine sleeve tooth connecting structure - Google Patents
Rigidity testing device and rigidity testing method for aero-engine sleeve tooth connecting structure Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
A rigidity testing device and a rigidity testing method for an aeroengine sleeve tooth connecting structure are provided. The invention relates to the technical field of rigidity testing of rotating mechanical couplers. The rigidity testing device and the rigidity testing method of the aero-engine sleeve tooth connecting structure are suitable for rigidity testing and influence factor analysis of the sleeve tooth connecting structure in a general mechanics laboratory. The technical scheme of the invention is as follows: the rigidity testing device comprises a base platform 17, a mounting frame 1, a torque loading device, a radial force loading device and a displacement measuring device; the mounting frame 1 is detachably connected to the base platform 17, and applies torque load to the external spline shaft 202 through a torque loading device; the radial force loading device applies radial pressure to the outer spline shaft 202 along the radial direction thereof; the radial deformation amount of the male spline shaft 202 is acquired by the displacement measuring device. The test bench has the advantages of being exquisite in structure, convenient to use, simple to operate, good in test effect and the like on the whole.
Description
Technical Field
The invention relates to the technical field of rigidity testing of rotating machinery couplers, in particular to a rigidity testing device for a sleeve gear connecting structure of an aero-engine.
Background
The sleeve gear connecting structure (also called sleeve gear coupling and aviation spline) is widely applied to the connection transmission of a fan rotor shaft and a low-pressure turbine rotor shaft in a turbofan engine system with a large bypass ratio, and has the structural characteristics of sleeve gear torque transmission, double-cylindrical-surface centering and large nut locking. Because the sleeve gear connecting structure has a plurality of contact surfaces, the contact state of the contact surfaces is inevitably changed when the sleeve gear connecting structure bears load, for example, the contact of the tooth surfaces is uneven, the centering cylindrical surface slides and the like, and finally the integral connection rigidity characteristic is likely to fluctuate, thereby influencing the dynamic characteristic of the whole system. The rigidity characteristic of the sleeve tooth connecting structure relates to a plurality of influence factors such as basic size of the structure, design of sleeve tooth parameters, control precision of form and position tolerance, assembling pretightening force and the like. The stiffness test platform of the sleeve tooth connecting structure is established, so that the influence rule of parameters such as structure, load and assembly on the stiffness characteristic of the sleeve tooth connecting structure can be researched, a basis is provided for designing and manufacturing a reasonable sleeve tooth connecting structure, a mechanical characteristic reference of a connecting part is provided for system dynamics design and analysis, and the stiffness test platform has important engineering application and research values.
At present, special equipment for testing the rigidity of the sleeve gear connecting structure is lack, the influence of torque load and the matching tightness of a cylindrical positioning surface is not considered in the rigidity testing process, the influence of a structure and load parameters which accord with actual conditions on the rigidity characteristic of the sleeve gear connecting structure cannot be obtained through the rigidity testing, and the testing process is complex.
Disclosure of Invention
Aiming at the problems, the invention provides a rigidity testing device and a rigidity testing method of an aeroengine sleeve tooth connecting structure, which are suitable for a general mechanics laboratory to carry out rigidity testing and influence factor analysis on the sleeve tooth connecting structure.
The technical scheme of the invention is as follows: the rigidity testing device comprises a base platform 17, a mounting frame 1, a torque loading device, a radial force loading device and a displacement measuring device;
the mounting frame 1 is detachably connected to the base platform 17, the flange of the inner spline shaft 201 is detachably connected with the mounting frame 1, the flange of the outer spline shaft 202 is detachably connected with the torque loading device, and torque load is applied to the outer spline shaft 202 through the torque loading device;
the radial force loading device is arranged along the radial direction of the sleeve tooth connecting structure, is connected with the outer spline shaft 202 and applies radial pressure to the outer spline shaft 202 along the radial direction of the outer spline shaft by the radial force loading device;
the displacement measuring device is arranged on the male spline shaft 202, and the radial deformation of the male spline shaft 202 is obtained by the displacement measuring device.
The radial force loading device comprises a spoke type pressure sensor 13, a jack top sleeve 14, a vertical jack 15 and a force transmission clamp 3;
the force transmission clamp 3 comprises a fastener 301 with a screw and a fastener 302 without a screw detachably connected on the fastener 301 with the screw, the fastener 301 with the screw and the fastener 301 with the screw are clamped on the outer wall of the external spline shaft 202, and the screw on the fastener 301 with the screw is arranged along the radial direction of the external spline shaft 202;
the vertical jack 15 is fixedly connected to the base platform 17 and parallel to the screw rod, the jack top sleeve 14 is fixedly connected to the top end of the piston rod in the vertical jack 15, the spoke type pressure sensor 13 is fixedly connected to the top surface of the jack top sleeve 14, a threaded hole is formed in the center of the spoke type pressure sensor 13, the screw rod on the fastener 301 with the screw rod is connected to the threaded hole through threads, and the length of the screw rod is smaller than the depth of the threaded hole.
The torque loading device comprises a rectangular plate 9 with a hole, an L-shaped support 6, a hollow flange shaft 8, a bearing 12, a weight hook 10, a weight 11 and a locking nut 7;
the L-shaped bracket 6 is detachably connected to the base platform 17, the upper part of the L-shaped bracket is provided with a containing hole, the hollow flange shaft 8 can rotatably penetrate through the containing hole through a bearing 12, a flange on the hollow flange shaft 8 is detachably connected with a flange of the external spline shaft 202, and the hollow flange shaft 8 and the external spline shaft 202 are coaxial;
the one end of foraminiferous rectangular plate 9 cup joints hollow flange axle 8, and keeps fixed with hollow flange axle 8 under lock nut 7's effect, the other end of foraminiferous rectangular plate 9 is articulated with the top of weight couple 10, weight 11 is placed on weight couple 10.
The displacement measuring device comprises a dial indicator 4, wherein the dial indicator 4 is connected to the base platform 17 through a dial indicator mounting frame 5, the dial indicator 4 is in contact with the flange of the external spline shaft 202, and the radial deformation of the flange of the external spline shaft 202 is measured through the dial indicator 4.
The test was carried out as follows:
s1, assembling:
s1.1, assembling the external spline shaft 202, the internal spline shaft 201 and the round nut 16;
s1.2, mounting a flange of an internal spline shaft 201 in the sleeve tooth connecting structure 2 on the mounting frame 1, and mounting a flange of an external spline shaft 202 on a flange of the hollow flange shaft 8;
s1.3, driving the vertical jack 15 to enable the fastener 301 with the screw to ascend and contact with the outer wall of the external spline shaft 202, and installing the fastener 302 without the screw on the fastener 301 with the screw to finish clamping the outer wall of the external spline shaft 202;
s1.4, moving the dial indicator 4 until the dial indicator is contacted with a flange of the external spline shaft 202;
s2, applying torque load: weights 11 are added on the weight hooks 10, so that the sleeve tooth connecting structure 2 integrally bears torque T;
s3, adjusting tightening torque: a torque wrench is used to give the tightening torque of the round nut 16;
s4, applying radial pressure: applying upward radial pressure to the sleeve gear connecting structure 2 through a vertical jack 15, wherein the radial pressure is gradually increased from 0N to 10kN, the radial pressure is increased by 500N every time, and dial indicator reading is recorded every time the force is increased;
s5, calculating static rigidity: the radial displacement Δ L of the socket tooth connection structure 2 under the action of the radial force Δ F is obtained in step S4, and the static stiffness K of the socket tooth connection structure 2 corresponding to different radial forces F under the condition that the nut tightening torque is constant and the torque load T is constant is calculated from the static stiffness K ═ Δ F/Δ L.
The rigidity testing method further comprises S6, analyzing the influence of the tightening torque on the static rigidity: and (3) changing the tightening torque of the round nut by using a torque wrench, and carrying out steps S4 and S5 again without changing weights, thereby obtaining the rule of the influence of the tightening torque on the rigidity characteristic of the sleeve tooth connecting structure.
The stiffness test method further comprises S7, analyzing the influence of the torque load on the static stiffness: and (5) replacing the weight, changing the torque T, maintaining the tightening torque as a fixed value, and repeating the steps S4 and S5 to obtain the rule of the influence of the torque load on the rigidity characteristic of the sleeve tooth connecting structure.
Compared with the prior art, the invention has the following technical effects: the rigidity testing device for the aero-engine sleeve tooth connecting structure comprises the sleeve tooth connecting structure used for simulating key characteristics of double-cylindrical-surface centering, sleeve tooth torque transmission, large nut locking and the like, a torque loading device used for applying torque load, a radial force loading device used for applying radial force load and a displacement measuring device used for obtaining displacement of the sleeve tooth connecting structure under the condition of loading. The invention is suitable for the rigidity test and the influence factor analysis of the sleeve gear connecting structure in a general mechanics laboratory, and has the advantages of exquisite structure, convenient use, simple operation, good test effect and the like on the whole.
Drawings
Figure 1 is a first perspective view of the present disclosure,
figure 2 is a second perspective view of the present disclosure,
figure 3 is a schematic structural view of the present coupling structure,
figure 4 is an axial cross-sectional view of the present case of a set tooth connection,
FIG. 5 is a schematic structural view of the female spline shaft in the present case,
FIG. 6 is a schematic view showing the internal structure of the female spline shaft in this case,
FIG. 7 is a schematic structural view of the external spline shaft in the present case,
FIG. 8 is a schematic view showing the internal structure of the female spline shaft in this case,
figure 9 is a schematic structural view of the mounting bracket in the present case,
figure 10 is a schematic view of the internal structure of the mounting bracket in the present case,
figure 11 is a schematic structural view of an L-shaped bracket in the present case,
FIG. 12 is a schematic view of the structure of the hollow flange shaft in the present case,
FIG. 13 is a schematic view showing the assembly structure of the hollow flange shaft and the L-shaped bracket in the present case,
figure 14 is a schematic structural view of the perforated rectangular plate of the present invention,
figure 15 is a schematic structural view of the weight hook in the present case,
figure 16 is a partial structural schematic view of the radial force loading device in the present case,
figure 17 is a cross-sectional view taken along line C-C of figure 16,
figure 18 is a schematic view of the construction of the force-transmitting clamp of the present invention,
figure 19 is a schematic view of the construction of a spoke type pressure sensor in this case,
figure 20 is a cross-sectional view taken along line D-D of figure 19,
figure 21 is a schematic structural view of the jack top sleeve in the present case,
figure 22 is a cross-sectional view taken along line E-E of figure 21,
FIG. 1 is a mounting bracket; 2, a sleeve tooth connecting structure; 201 is a female spline shaft; 202 is an external spline shaft;
3 is a force-transmitting clamp; 301 is a fastener with a screw; 302 is a screwless fastener; 4 is a dial indicator; 5 is a dial indicator mounting rack; 6 is an L-shaped bracket; 7 is a lock nut; 8 is a hollow flange shaft; 9 is a perforated rectangular plate; 10 is a weight hook; 11 is a weight; 12 is a bearing;
13 is a spoke pressure sensor; 14 is a jack top sleeve; 15 is a vertical jack;
16 is a round nut; 17 is a base platform.
Detailed Description
In order to clearly explain the technical features of the present patent, the following detailed description of the present patent is provided in conjunction with the accompanying drawings.
As shown in fig. 1-22, the rigidity testing device comprises a base platform 17, a mounting frame 1, a torque loading device, a radial force loading device and a displacement measuring device;
the mounting frame 1 is detachably connected to the base platform 17, the flange of the inner spline shaft 201 is detachably connected with the mounting frame 1, the flange of the outer spline shaft 202 is detachably connected with the torque loading device, and torque load is applied to the outer spline shaft 202 through the torque loading device;
the radial force loading device is arranged along the radial direction of the sleeve tooth connecting structure, is connected with the outer spline shaft 202 and applies radial pressure to the outer spline shaft 202 along the radial direction of the outer spline shaft by the radial force loading device;
the displacement measuring device is arranged on the male spline shaft 202, and the radial deformation of the male spline shaft 202 is obtained by the displacement measuring device. Therefore, radial pressure is applied to the outer spline shaft 202 along the radial direction of the outer spline shaft 202 by the radial force loading device, the radial deformation of the outer spline shaft 202 can be obtained by the displacement measuring device, and the static rigidity of the sleeve tooth connecting structure 2 is calculated. The invention is suitable for the rigidity test and the influence factor analysis of the sleeve gear connecting structure in a general mechanics laboratory, and has the advantages of exquisite structure, convenient use, simple operation, good test effect and the like on the whole.
As shown in fig. 3-8, the set tooth connection structure 2, which may also be referred to as an aircraft spline, includes an external spline shaft 202, an internal spline shaft 201, and a round nut 16;
the outer spline shaft 202 is of a hollow stepped shaft structure, the middle section of the outer wall of the outer spline shaft is provided with a standard pressure angle 30-degree flat root cylindrical straight tooth involute outer spline, one end of the outer spline shaft 202 is provided with an external thread, and the other end of the outer spline shaft is provided with a flange;
the internal spline shaft 201 is of a hollow flange shaft sleeve structure, the inner wall of the internal spline shaft is provided with a standard pressure angle 30-degree flat tooth root cylindrical straight tooth involute internal spline, and the outer wall of the internal spline shaft 201 is also provided with a flange;
the external spline shaft 202 is arranged in the internal spline shaft 201 in a penetrating way, so that the external spline and the internal spline are meshed; the end of the male spline shaft 202 with the external thread penetrates out of the female spline shaft 201 and is in threaded connection with the round nut 16, so that the male spline shaft 202 and the female spline shaft 201 are axially fixed.
In order to facilitate the study of the influence of the fit tightness of the cylindrical positioning surfaces on the rigidity characteristic of the sleeve tooth connecting structure, three groups of sleeve tooth connecting structures are prepared, the appearance characteristics of each group of sleeve tooth connecting structures are completely consistent, the difference lies in that the fit tightness of the B positioning surfaces of each group of sleeve tooth connecting structures are different and are respectively in 0.02 mm clearance fit, 0.04 mm clearance fit and 0.01 mm interference fit, and the A positioning surfaces all adopt the same clearance fit parameters.
As shown in fig. 1-2, 16-22, the radial force loading device comprises a spoke type pressure sensor 13, a jack top sleeve 14, a vertical jack 15 and a force transmission clamp 3;
the force transmission clamp 3 comprises a fastener 301 with a screw and a fastener 302 without a screw detachably connected on the fastener 301 with the screw, the fastener 301 with the screw and the fastener 301 with the screw are clamped on the outer wall of the external spline shaft 202, and the screw on the fastener 301 with the screw is arranged along the radial direction of the external spline shaft 202;
the vertical jack 15 is fixedly connected to the base platform 17 and parallel to the screw rod, the jack top sleeve 14 is fixedly connected to the top end of the piston rod in the vertical jack 15, the spoke type pressure sensor 13 is fixedly connected to the top surface of the jack top sleeve 14, a threaded hole is formed in the center of the spoke type pressure sensor 13, the screw rod on the fastener 301 with the screw rod is connected to the threaded hole through threads, and the length of the screw rod is smaller than the depth of the threaded hole. Thus, the vertical jack 15 can apply radial pressure to the external spline shaft 202 in the radial direction thereof. The method has the advantages of simple operation, high action efficiency, high measurement precision and good radial pressure application effect.
When the vertical jack 15 applies a load, the pressure is firstly transmitted to the structure without pressure sensing capability at the periphery of the pressure sensor 13 through the jack top sleeve 14, and because the length of the screw of the fastener 301 with the screw is smaller than the depth of the central threaded hole of the spoke type pressure sensor 13, and the center of the spoke type pressure sensor 13 is a pressure sensing part, the central part of the pressure sensor 13 generates strain through the counter-acting force transmitted by the fastener 301 with the screw, and the measurement of the radial force can be realized.
As shown in fig. 1-2 and 11-15, the torque loading device comprises a perforated rectangular plate 9, an L-shaped bracket 6, a hollow flange shaft 8, a bearing 12, a weight hook 10, a weight 11 and a locking nut 7;
the L-shaped bracket 6 is detachably connected to the base platform 17, the upper part of the L-shaped bracket is provided with a containing hole, the hollow flange shaft 8 can rotatably penetrate through the containing hole through a bearing 12, a flange on the hollow flange shaft 8 is detachably connected with a flange of the external spline shaft 202, and the hollow flange shaft 8 and the external spline shaft 202 are coaxial;
the one end of foraminiferous rectangular plate 9 cup joints hollow flange axle 8, and keeps fixed with hollow flange axle 8 under lock nut 7's effect, the other end of foraminiferous rectangular plate 9 is articulated with the top of weight couple 10, weight 11 is placed on weight couple 10. Thus, after the weight 11 is placed on the weight hook 10, a torque load is applied to the male spline shaft 202 via the hollow flange shaft 8. The torque applying device has the advantages of being exquisite in structure, convenient to use, simple to operate, good in torque applying effect, stable in torque applying and the like.
As shown in fig. 1-2, the displacement measuring device includes a dial indicator 4, the dial indicator 4 is connected to the base platform 17 through a dial indicator mounting bracket 5, the dial indicator 4 contacts with the flange of the external spline shaft 202, and the radial deformation of the flange of the external spline shaft 202 is measured through the dial indicator 4.
The test was carried out as follows:
s1, assembling:
s1.1, assembling the external spline shaft 202, the internal spline shaft 201 and the round nut 16;
s1.2, mounting a flange of an internal spline shaft 201 in the sleeve tooth connecting structure 2 on the mounting frame 1, and mounting a flange of an external spline shaft 202 on a flange of the hollow flange shaft 8;
s1.3, driving the vertical jack 15 to enable the fastener 301 with the screw to ascend and contact with the outer wall of the external spline shaft 202, and installing the fastener 302 without the screw on the fastener 301 with the screw to finish clamping the outer wall of the external spline shaft 202;
s1.4, moving the dial indicator 4 until the dial indicator is contacted with a flange of the external spline shaft 202;
s2, applying torque load: weights 11 are added on the weight hooks 10, so that the sleeve tooth connecting structure 2 integrally bears torque T;
s3, adjusting tightening torque: a torque wrench is used to give the tightening torque of the round nut 16;
s4, applying radial pressure: applying upward radial pressure to the sleeve gear connecting structure 2 through a vertical jack 15, wherein the radial pressure is gradually increased from 0N to 10kN, the radial pressure is increased by 500N every time, and dial indicator reading is recorded every time the force is increased;
s5, calculating static rigidity: the radial displacement Δ L of the socket tooth connection structure 2 under the action of the radial force Δ F is obtained in step S4, and the static stiffness K of the socket tooth connection structure 2 corresponding to different radial forces F under the condition that the nut tightening torque is constant and the torque load T is constant is calculated from the static stiffness K ═ Δ F/Δ L.
The rigidity testing method further comprises S6, analyzing the influence of the tightening torque on the static rigidity: and (3) changing the tightening torque of the round nut by using a torque wrench, and carrying out steps S4 and S5 again without changing weights, thereby obtaining the rule of the influence of the tightening torque on the rigidity characteristic of the sleeve tooth connecting structure.
The stiffness test method further comprises S7, analyzing the influence of the torque load on the static stiffness: and (5) replacing the weight, changing the torque T, maintaining the tightening torque as a fixed value, and repeating the steps S4 and S5 to obtain the rule of the influence of the torque load on the rigidity characteristic of the sleeve tooth connecting structure.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. The rigidity testing device of the aeroengine sleeve tooth connecting structure is characterized by comprising a base platform (17), a mounting frame (1), a torque loading device, a radial force loading device and a displacement measuring device;
the mounting frame (1) is detachably connected to the base platform (17), the flange of the inner spline shaft (201) is detachably connected with the mounting frame (1), the flange of the outer spline shaft (202) is detachably connected with the torque loading device, and torque load is applied to the outer spline shaft (202) through the torque loading device;
the radial force loading device is arranged along the radial direction of the sleeve tooth connecting structure, is connected with the outer spline shaft (202), and applies radial pressure to the outer spline shaft (202) along the radial direction of the outer spline shaft through the radial force loading device;
the displacement measuring device is arranged on the external spline shaft (202), and the radial deformation of the external spline shaft (202) is obtained through the displacement measuring device;
the torque loading device comprises a rectangular plate (9) with a hole, an L-shaped support (6), a hollow flange shaft (8), a bearing (12), a weight hook (10), a weight (11) and a locking nut (7);
the L-shaped support (6) is detachably connected to the base platform (17), a containing hole is formed in the upper portion of the L-shaped support, the hollow flange shaft (8) rotatably penetrates through the containing hole through a bearing (12), a flange on the hollow flange shaft (8) is detachably connected with a flange of the external spline shaft (202), and the hollow flange shaft (8) and the external spline shaft (202) are coaxial;
the one end of foraminiferous rectangular plate (9) is cup jointed hollow flange axle (8), and keep fixed with hollow flange axle (8) under lock nut (7)'s effect, the other end of foraminiferous rectangular plate (9) is articulated with the top of weight couple (10), weight (11) are placed on weight couple (10).
2. The rigidity testing device of an aircraft engine tooth-sleeving connecting structure according to claim 1, wherein the radial force loading device comprises a spoke type pressure sensor (13), a jack top sleeve (14), a vertical jack (15) and a force transmission clamp (3);
the force transmission clamp (3) comprises a fastener (301) with a screw and a fastener (302) without the screw, wherein the fastener (301) with the screw is detachably connected to the fastener (301) with the screw, the fastener (301) with the screw and the fastener (301) with the screw are clamped on the outer wall of the outer spline shaft (202), and the screw on the fastener (301) with the screw is arranged along the radial direction of the outer spline shaft (202);
vertical jack (15) fixed connection just parallels with the screw rod on basic platform (17), top sleeve (14) fixed connection of jack top is on the top of piston rod in vertical jack (15), spoke formula pressure sensor (13) fixed connection on the top surface of jack top sleeve (14) and spoke formula pressure sensor's (13) center have the screw hole, screw rod on the fastener (301) of taking the screw rod passes through threaded connection in the screw hole, and the length of screw rod is less than the degree of depth of screw hole.
3. The rigidity testing device of the aircraft engine sleeve gear connecting structure is characterized in that the displacement measuring device comprises a dial indicator (4), the dial indicator (4) is connected to the base platform (17) through a dial indicator mounting frame (5), the dial indicator (4) is in contact with a flange of the external spline shaft (202), and the radial deformation of the flange of the external spline shaft (202) is measured through the dial indicator (4).
4. A rigidity testing method for an aeroengine sleeve gear connecting structure is characterized by comprising the following steps of:
s1, assembling:
s1.1, assembling the external spline shaft (202), the internal spline shaft (201) and the round nut (16);
s1.2, mounting a flange of an internal spline shaft (201) in the sleeve tooth connecting structure (2) on a mounting frame (1), and mounting a flange of an external spline shaft (202) on a flange of a hollow flange shaft (8);
s1.3, driving a vertical jack (15) to enable a fastener (301) with a screw to ascend and contact with the outer wall of the external spline shaft (202), and installing a fastener (302) without the screw on the fastener (301) with the screw to clamp the outer wall of the external spline shaft (202);
s1.4, moving the dial indicator (4) until the dial indicator is contacted with a flange of the external spline shaft (202);
s2, applying torque load: weights (11) are added on the weight hooks (10), so that the sleeve gear connecting structure (2) can bear torque T integrally;
s3, adjusting tightening torque: a torque wrench is used to give the tightening torque of the round nut 16;
s4, applying radial pressure: applying upward radial pressure to the sleeve gear connecting structure (2) through a vertical jack 15, wherein the radial pressure is gradually increased from 0N to 10kN, the radial pressure is increased by 500N every time, and dial indicator reading is recorded every time the force is increased;
s5, calculating static rigidity: obtaining the radial displacement Δ L of the sleeve tooth connecting structure (2) under the action of the radial force F through the step S4, and calculating the static stiffness K of the sleeve tooth connecting structure (2) corresponding to different radial forces F under the conditions that the nut tightening torque is unchanged and the torque load T is constant according to the static stiffness K =/;
the stiffness test method further comprises S7, analyzing the influence of the torque load on the static stiffness: and (5) replacing the weight, changing the torque T, maintaining the tightening torque as a fixed value, and repeating the steps S4 and S5 to obtain the rule of the influence of the torque load on the rigidity characteristic of the sleeve tooth connecting structure.
5. The rigidity testing method of the aeroengine sleeve tooth connecting structure according to claim 4, characterized in that the rigidity testing method further comprises S6, analyzing the influence of the tightening torque on the static rigidity: and (3) changing the tightening torque of the round nut by using a torque wrench, and carrying out steps S4 and S5 again without changing weights, thereby obtaining the rule of the influence of the tightening torque on the rigidity characteristic of the sleeve tooth connecting structure.
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