Elastic bearing fatigue life test device and method

Abstract

According to the elastic bearing fatigue life test device and method provided by the invention, a hydraulic actuator cylinder combined frame structure adopted by a traditional fatigue test system is abandoned, the rotating assembly is creatively adopted, and the fatigue life of the elastic bearing is tested by utilizing the rotating action of the rotating assembly driven by the motor. A cam connecting rod is combined to drive an elastic bearing to realize torsion circulating motion, and a metal wheel drives the elastic bearing to realize bending circulating motion, so that torsion and bending fatigue load application of the elastic bearing is realized, and a fatigue life test of the elastic bearing is realized. The torsion angle can be adjusted by adjusting the diameter and angle of the cam connecting rod, so that the torsion load can be applied under different working conditions; and the bending angle can be adjusted by adjusting the diameter of the metal wheel, so that the bending load can be applied under different working conditions.

Description

Technical Field

[0001] The invention relates to a device and method for testing the fatigue life of an elastic bearing. Background Art

[0002] The elastic bearing is an elastic composite structural component composed of a metal sheet and a rubber sheet, and is composed of a metal head, a metal head, and an elastic composite component composed of a rubber sheet and a metal sheet. The metal head, the metal head, and the elastic composite component composed of a rubber sheet and a metal sheet are bonded together by a special adhesive to form a whole.

[0003] Elastic bearings are important components of the rotor system. During operation, they need to withstand various forces from the blades, such as centrifugal force, flapping and shimmy. The force conditions are complex. Therefore, before elastic bearings are installed or put into mass production, they need to rely on fatigue life test equipment and test methods to test their fatigue life indicators.

[0004] The existing elastic bearing fatigue life test equipment and test methods have the following problems: 1. The existing elastic bearing fatigue life test system adopts a combined frame structure of multiple hydraulic cylinders, and the test system occupies a large area and is very expensive; 2. The existing elastic bearing fatigue life test system has slow response, low efficiency, and a long test cycle; 3. The existing elastic bearing fatigue life test system can only test a single elastic bearing and cannot test multiple elastic bearings at the same time. Summary of the invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide an elastic bearing fatigue life test device and method in view of the shortcomings of the prior art, aiming to solve the problems of elastic bearing fatigue life test system occupying a large area, huge cost, low test efficiency, long test cycle and inability to test multiple pieces at the same time. The device includes a test bench assembly, a mounting seat assembly, a rotating assembly, and a test piece elastic bearing;

[0006] Among them, the functions of the test bench assembly include: providing a platform for fixing the mounting seat assembly and providing a rotational power to the rotating assembly;

[0007] The mounting seat assembly is connected to the test bench assembly by bolts and is used to install and fix the elastic bearing test piece;

[0008] The rotating assembly is connected to the test bench assembly through a nut and is used to apply a load so that the elastic bearing specimen completes two actions: cyclic torsion and cyclic bending.

[0009] The test bench assembly includes a platform, a column, a base, an adjustable speed motor, a reducer and a rotating shaft, wherein the platform, the column and the base are connected as a whole by a bolt group; the adjustable speed motor is connected to the base by a bolt group; the reducer is connected to the platform by a bolt group; the adjustable speed motor and the reducer housing are connected by a bolt group, and the output shaft of the adjustable speed motor and the input shaft of the reducer are connected by a coupling; the rotating shaft and the output shaft of the reducer are fixed by a threaded connection.

[0010] The adjustable speed motor drives the reducer to rotate.

[0011] The speed reducer drives the rotating shaft to rotate.

[0012] The mounting seat assembly comprises a mounting seat, a semicircular tooling, a convex block and a connecting rod;

[0013] The elastic bearing comprises an elastic bearing big head, an elastic bearing rubber sheet and metal sheet assembly, and an elastic bearing small head;

[0014] The big end of the elastic bearing is connected to the mounting seat by bolts;

[0015] The small head of the elastic bearing is connected to the semicircular fixture by means of bolts;

[0016] The convex block and the connecting rod are connected with the semicircular tooling through bolts.

[0017] The rotating assembly includes a fixed disc, a cam, a door-shaped bracket, a metal wheel and a pin shaft;

[0018] The door-shaped bracket and the cam are connected with the fixed disc through bolts.

[0019] The metal wheel is connected with the door-shaped bracket through a pin shaft.

[0020] The elastic bearing big head, the elastic bearing rubber sheet and metal sheet assembly and the elastic bearing small head are bonded together to form an integral elastic bearing component through structural adhesive.

[0021] The elastic bearing rubber sheet and metal sheet assembly is a flexible piece that can be twisted and bent.

[0022] The present invention also provides a method for testing the fatigue life of an elastic bearing, comprising the following steps:

[0023] Step 1, fixing the base of the test bench assembly;

[0024] Step 2, the adjustable speed motor of the test bench assembly drives the reducer, the reducer drives the rotating shaft, and the rotating shaft drives the rotating assembly to rotate;

[0025] Step 3, the cam of the rotating assembly starts to contact the connecting rod of the mounting seat assembly at a 0-degree state. As the cam rotates, the connecting rod starts to twist, thereby driving the semicircular tooling to twist. The twisting of the semicircular tooling drives the small head of the elastic bearing to twist. As the cam rotates, it gradually transitions from a 0-degree state to a 90-degree state. After the connecting rod reaches a certain angle (generally 35 to 65 degrees), it starts to return to zero, thereby achieving a twisting movement of the small head of the elastic bearing. During this process, the large head of the elastic bearing remains fixed. The twisting angle can be adjusted by adjusting the diameter and angle of the connecting rod, thereby achieving the application of torsional loads under different working conditions.

[0026] Step 4, the metal wheel of the rotating assembly begins to contact the protrusion of the mounting seat assembly at a state close to 90 degrees. As the metal wheel rotates, the protrusion is squeezed downward by the metal wheel, and the protrusion drives the bending of the semicircular tooling downward, thereby driving the bending of the small head of the elastic bearing. At the 90-degree state, the position of the protrusion reaches the lowest point. As the metal wheel continues to rotate, the protrusion begins to gradually return to the original state, thereby completing a bending movement of the small head of the elastic bearing. In this process, the large head of the elastic bearing remains fixed; wherein, the bending angle can be adjusted by adjusting the diameter of the metal wheel, thereby realizing the application of bending loads under different working conditions;

[0027] Step 5, the rotating assembly rotates one circle, and the elastic bearing head can achieve two torsion cycles and two bending cycles.

[0028] The present invention realizes fatigue life test technology of multiple elastic bearings under various working conditions through a set of elastic bearing fatigue life test device and test method; and the load size of fatigue life test working conditions can be adjusted by adjusting the connecting rod mechanism and the metal wheel mechanism.

[0029] The test bench assembly of the present invention has two functions: first, to provide a basic installation platform for fixing the mounting seat assembly; second, to provide a power output platform for providing rotational power to the rotating assembly.

[0030] The present invention adopts a mounting seat assembly to fix the test piece, the big head of the elastic bearing is connected to the mounting seat through a bolt group; the small head of the elastic bearing is connected to a semicircular tooling through a bolt group; the big head of the elastic bearing, the elastic bearing rubber sheet and metal sheet assembly and the elastic bearing small head are bonded to form an integral elastic bearing part through structural adhesive, wherein the elastic bearing rubber sheet and metal sheet assembly are flexible parts that can be twisted and bent; the convex block and the connecting rod are connected to the semicircular tooling through a bolt group.

[0031] The invention adopts a rotating assembly to apply cyclic torsion and cyclic bending loads; a gate-shaped bracket and a cam are connected with a fixed disc through bolts; and a metal wheel is connected with the gate-shaped bracket through a pin shaft.

[0032] Beneficial effects: 1. The present invention utilizes the rotating assembly to ingeniously realize two torsion cycles and two bending cycles of four elastic bearings in one rotation cycle, and the fatigue life test of four elastic bearings can be completed at the same time;

[0033] 2. The test system of the present invention greatly reduces the volume and number of parts of the test system, improves the test efficiency, and greatly shortens the test cycle;

[0034] 3. The present invention can greatly shorten the fatigue life test cycle of the elastic bearing, thereby greatly shortening the research and development cycle of the elastic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0036] Figure 1 It is a schematic diagram of the 0 degree state of the elastic bearing fatigue test system.

[0037] Figure 2 It is a schematic diagram of the 90-degree state of the elastic bearing fatigue test system.

[0038] Figure 3 is a schematic diagram of the test bench components.

[0039] Figure 4 Schematic diagram of the mounting assembly.

[0040] Figure 5 is a schematic diagram of the rotating assembly.

[0041] Figure 6 It is a schematic diagram of an elastic bearing. DETAILED DESCRIPTION

[0042] The present invention provides an elastic bearing fatigue life test device, the device comprising a test bench assembly 100, a mounting seat assembly 200, a rotating assembly 300, and a test piece elastic bearing 400;

[0043] The functions of the test bench assembly 100 include: providing a platform for fixing the mounting seat assembly 200 and providing a rotational power to the rotating assembly 300;

[0044] The mounting seat assembly 200 is connected to the test bench assembly 100 by bolts, and is used to install and fix the elastic bearing test piece; the rotating assembly 300 is connected to the test bench assembly 100 by nuts, and is used to apply load so that the elastic bearing test piece can complete two actions: cyclic torsion and cyclic bending.

[0045] The test bench assembly 100 includes a platform 101, a column 102, a base 103, an adjustable speed motor 104, a reducer 105 and a rotating shaft 106, wherein the platform 101, the column 102 and the base 103 are connected as a whole by a bolt group; the adjustable speed motor 104 is connected to the base 103 by a bolt group; the reducer 105 is connected to the platform 101 by a bolt group; the adjustable speed motor 104 and the reducer 105 housing are connected by a bolt group, and the output shaft of the adjustable speed motor 104 and the input shaft of the reducer 105 are connected by a coupling; the rotating shaft 106 and the output shaft of the reducer 105 are fixed by a threaded connection, the adjustable speed motor 104 drives the reducer 105 to rotate, and the reducer 105 drives the rotating shaft 106 to rotate.

[0046] The mounting seat assembly 200 includes a mounting seat 201, a semicircular tooling 202, a protrusion 203 and a connecting rod 204; the large head 401 of the elastic bearing is connected to the mounting seat 201 by bolts; the small head 403 of the elastic bearing is connected to the semicircular tooling 202 by bolts; the protrusion 203 and the connecting rod 204 are connected to the semicircular tooling 202 by bolts.

[0047] The rotating assembly 300 includes a fixed disc 301 , a cam 302 , a gate-shaped bracket 303 , a metal wheel 304 and a pin 305 ; the gate-shaped bracket 303 and the cam 302 are connected to the fixed disc 301 via bolts; the metal wheel 304 is connected to the gate-shaped bracket 303 via the pin 305 .

[0048] The elastic bearing 400 comprises an elastic bearing big head 401, an elastic bearing rubber sheet and metal sheet assembly 402, and an elastic bearing small head 403; the elastic bearing big head 401, the elastic bearing rubber sheet and metal sheet assembly 402, and the elastic bearing small head 403 are bonded to form an integral elastic bearing component by structural adhesive, wherein the elastic bearing rubber sheet and metal sheet assembly 402 is a flexible component that can be twisted and bent.

[0049] The present invention also provides a method for testing the fatigue life of an elastic bearing, comprising the following steps:

[0050] Step 1, fixing the base 103 of the test bench assembly 100;

[0051] Step 2, the adjustable speed motor 104 of the test bench assembly 100 drives the reducer 105, the reducer 105 drives the rotating shaft 106, and the rotating shaft 106 drives the rotating assembly 300 to rotate;

[0052] Step 3, the cam 302 of the rotating assembly 300 begins to contact the connecting rod 204 of the mounting seat assembly 200 at the 0 degree state, and as the cam 302 rotates, the connecting rod 204 begins to twist, thereby driving the semicircular tooling 202 to twist, and the twisting of the semicircular tooling 202 drives the small head 403 of the elastic bearing to twist, and as the cam 302 rotates, it gradually transitions from the 0 degree state to the 90 degree state, and the connecting rod 204 begins to return to zero after reaching a certain angle, thereby realizing a torsional movement of the small head 403 of the elastic bearing, and in this process, the large head 401 of the elastic bearing remains fixed; wherein, the torsional angle can be adjusted by adjusting the diameter and angle of the connecting rod 204, thereby realizing the application of torsional loads under different working conditions.

[0053] Step 4, the metal wheel 304 of the rotating assembly 300 begins to contact the protrusion 203 of the mounting seat assembly 200 at a state close to 90 degrees. As the metal wheel 304 rotates, the protrusion 203 is squeezed by the metal wheel 304 and begins to move downward. The protrusion 203 drives the semicircular tooling 202 to bend downward, thereby driving the small head 403 of the elastic bearing to bend. At 90 degrees, the position of the protrusion 203 reaches the lowest point. As the metal wheel 304 continues to rotate, the protrusion 203 begins to gradually return to the original state, thereby completing a bending movement of the small head 403 of the elastic bearing. In this process, the large head 401 of the elastic bearing remains fixed. The bending angle can be adjusted by adjusting the diameter of the metal wheel 304, thereby realizing the application of bending loads under different working conditions.

[0054] Step 5: The rotating assembly 300 rotates one circle, and the elastic bearing head 403 can achieve two torsion cycles and two bending cycles. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 shown.

[0055] The present invention provides a fatigue life test device and method for elastic bearings. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. An elastic bearing fatigue life test device, characterized in that: It comprises a test bench assembly (100), a mounting seat assembly (200), a rotating assembly (300), and a test piece elastic bearing (400); The functions of the test bench assembly (100) include: providing a platform for fixing the mounting seat assembly (200) and providing a rotational power to the rotating assembly (300); The mounting seat assembly (200) is connected to the test bench assembly (100) via bolts and is used to mount and fix the elastic bearing test piece; The rotating assembly (300) is connected to the test bench assembly (100) via a nut and is used to apply a load so that the elastic bearing specimen can complete two actions: cyclic torsion and cyclic bending.

2. The elastic bearing fatigue life test device according to claim 1, characterized in that: The test bench assembly (100) comprises a platform (101), a column (102), a base (103), an adjustable speed motor (104), a reducer (105) and a rotating shaft (106), wherein the platform (101), the column (102) and the base (103) are connected as a whole by a bolt group; the adjustable speed motor (104) is connected to the base (103) by a bolt group; the reducer (105) is connected to the platform (101) by a bolt group; the adjustable speed motor (104) and the reducer (105) housing are connected by a bolt group, and the output shaft of the adjustable speed motor (104) and the input shaft of the reducer (105) are connected by a coupling; the rotating shaft (106) and the output shaft of the reducer (105) are fixed by a threaded connection.

3. The elastic bearing fatigue life test device according to claim 2, characterized in that: The adjustable speed motor (104) drives the reducer (105) to rotate.

4. The elastic bearing fatigue life test device according to claim 3, characterized in that: The speed reducer (105) drives the rotating shaft (106) to rotate.

5. The elastic bearing fatigue life test device according to claim 4, characterized in that: The mounting seat assembly (200) comprises a mounting seat (201), a semicircular tool (202), a convex block (203) and a connecting rod (204); The elastic bearing (400) comprises an elastic bearing large head (401), an elastic bearing rubber sheet and metal sheet assembly (402), and an elastic bearing small head (403); The elastic bearing big head (401) is connected to the mounting seat (201) via bolts; The elastic bearing small head (403) is connected to the semicircular tooling (202) via bolts; The protrusion (203) and the connecting rod (204) are connected to the semicircular tooling (202) via bolts.

6. The elastic bearing fatigue life test device according to claim 5, characterized in that: The rotating assembly (300) comprises a fixed disc (301), a cam (302), a door-shaped bracket (303), a metal wheel (304) and a pin (305); The door-shaped bracket (303) and the cam (302) are connected to the fixed disc (301) via bolts.

7. The elastic bearing fatigue life test device according to claim 6, characterized in that: The metal wheel (304) is connected to the door-shaped bracket (303) via a pin shaft (305).

8. The elastic bearing fatigue life test device according to claim 7, characterized in that: The elastic bearing big head (401), the elastic bearing rubber sheet and metal sheet assembly (402) and the elastic bearing small head (403) are bonded together into an integral elastic bearing component by means of structural adhesive.

9. The elastic bearing fatigue life test device according to claim 8, characterized in that: The elastic bearing rubber sheet and metal sheet assembly (402) is a flexible piece capable of twisting and bending.

10. A method for testing the fatigue life of an elastic bearing, characterized in that: The following steps are involved: Step 1, fixing the base (103) of the test bench assembly (100); Step 2, the adjustable speed motor (104) of the test bench assembly (100) drives the reducer (105), the reducer (105) drives the rotating shaft (106), and the rotating shaft (106) drives the rotating assembly (300) to rotate; Step 3, the cam (302) of the rotating assembly (300) starts to contact the connecting rod (204) of the mounting seat assembly (200) at a 0 degree state. As the cam (302) rotates, the connecting rod (204) starts to twist, thereby driving the semicircular tooling (202) to twist. The twisting of the semicircular tooling (202) drives the small head (403) of the elastic bearing to twist. As the cam (302) rotates, it gradually transitions from a 0 degree state to a 90 degree state. After reaching a certain angle, the connecting rod (204) starts to return to zero, thereby achieving a twisting movement of the small head (403) of the elastic bearing. During this process, the large head (401) of the elastic bearing remains fixed. The twisting angle can be adjusted by adjusting the diameter and angle of the connecting rod (204), thereby achieving the application of twisting loads under different working conditions. Step 4, the metal wheel (304) of the rotating assembly (300) begins to contact the protrusion (203) of the mounting seat assembly (200) at a state close to 90 degrees. As the metal wheel (304) rotates, the protrusion (203) is squeezed downward by the metal wheel (304), and the protrusion (203) drives the semicircular tooling (202) to bend downward, thereby driving the elastic bearing small head (403) to bend. At the 90-degree state, the position of the protrusion (203) reaches the lowest point. As the metal wheel (304) continues to rotate, the protrusion (203) begins to gradually return to the original state, thereby completing a bending movement of the elastic bearing small head (403). During this process, the elastic bearing large head (401) remains fixed; wherein, the bending angle can be adjusted by adjusting the diameter of the metal wheel (304), thereby realizing the application of bending loads under different working conditions; Step 5: The rotating assembly (300) rotates one circle, and the elastic bearing head (403) can achieve two torsion cycles and two bending cycles.

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