Fatigue test system applied to different types of torsional springs and test method thereof

Abstract

The invention relates to the field of test of reset elements, in particular to a fatigue test system applied to different types of torsional springs, which comprises a test platform, and an amplitude device, a test device and at least one torsional spring mounting device which are mounted on the test platform, the rotary table is further provided with an amplitude adjusting mechanism used for adjusting the stroke of the amplitude connecting rod. The torsion spring mounting device comprises a rotating disc rotationally connected to the test platform, a torsion spring mounting column is arranged at the center of the rotating disc, a first limiting plate is eccentrically arranged on the rotating disc, a limiting disc is coaxially and rotationally connected to the periphery of the rotating disc, and a second limiting plate is arranged on the limiting disc; the testing device comprises a testing gear and a testing rack, the testing gear and the rotating disc are coaxially arranged, and the testing rack is rotationally connected to the amplitude connecting rod and is in meshing transmission with the testing gear. By implementing the scheme, the problem that a traditional testing device is low in testing efficiency is solved.

Description

Technical Field

[0001] The present invention relates to the field of testing reset components, and specifically relates to a fatigue testing system and a testing method for different types of torsion springs. Background Art

[0002] A torsion spring is a type of reset component that is widely used in various fields such as aerospace, medical devices, and wind power generation. It is mainly sleeved on a rotating shaft or a pin shaft for resetting. The quality of the torsion spring directly affects the service life and quality of the products it is applied to. Therefore, before the torsion spring is put into use, it is necessary to conduct a fatigue strength test on the torsion spring. Fatigue strength refers to the maximum stress that will not cause damage under an infinite number of alternating loads. Therefore, it is necessary to compress the two ends of the torsion spring to test its recovery ability.

[0003] The patent with the publication number CN110514432A discloses a torsion spring life testing device, including a base. A fixed shaft is fixedly arranged on the base, and the to-be-tested torsion spring is sleeved on the fixed shaft. A fixing component is arranged on one side of the base to fix one torsion arm of the to-be-tested torsion spring, and the other torsion arm of the to-be-tested torsion spring is fixedly arranged on a first positioning block. A rotating component is arranged on the base. The rotating component includes a driving source and a turntable. The driving source drives the turntable to rotate. The first positioning block is fixedly arranged on the turntable and rotates with the turntable. A through hole is penetrated and opened at the center of the turntable, and the fixed shaft is arranged in the through hole. Although this device can test the fatigue strength of the torsion spring, it cannot achieve batch testing and has the problem of low efficiency.

[0004] The patent with the publication number CN201740691U discloses an efficient torsion spring durability testing device. Although this device can achieve batch testing, this structure occupies a large area, and the number of tests per batch is limited. At the same time, when changing the torsion spring test type, it is not conducive to batch debugging. More importantly: the motor of this structure needs to rotate forward and backward frequently. Especially, the intermediate large gear has a large moment of inertia and is difficult to reverse. Usually, the forward and backward rotation frequency of the motor without load is dozens of times / min. Moreover, it also needs to drive several surrounding loads. Therefore, the test efficiency is extremely low.

[0005] In summary, it is necessary to design a testing system that can perform batch testing and has high detection efficiency. Summary of the Invention

[0006] The present invention aims to provide a fatigue testing system and a testing method for different types of torsion springs to solve the problem of low test efficiency of traditional testing devices.

[0007] To achieve the above object, the present invention adopts the following technical solutions: An applied different types of torsion spring fatigue test system and its test method, including a test platform and an amplitude device, a test device, and at least one torsion spring mounting device installed on the test platform. The amplitude device includes a turntable and an amplitude connecting rod eccentrically connected to the turntable. An amplitude adjusting mechanism for adjusting the stroke size of the amplitude connecting rod is also provided on the turntable; the torsion spring mounting device includes a turntable rotatably connected to the test platform. A torsion spring mounting column is provided at the center of the turntable. A first limiting plate is eccentrically provided on the turntable. A limiting disk is coaxially rotatably connected to the outer periphery of the turntable. A second limiting plate is provided on the limiting disk; the test device includes a test gear and a test rack. The test gear is coaxially arranged with the turntable. The test rack is rotatably connected to the amplitude connecting rod and meshes with the test gear for transmission.

[0008] Preferably, as an improvement, the amplitude adjusting mechanism includes an adjusting gear and a locking structure for locking the adjusting gear. The adjusting gear is eccentrically rotatably connected to the turntable. One end of the amplitude connecting rod away from the test rack is eccentrically rotatably connected to the adjusting gear.

[0009] Preferably, as an improvement, an automatic driving mechanism for automatically adjusting the amplitude adjusting mechanism is also provided on the test platform. The automatic driving mechanism includes a driving gear for meshing with the adjusting gear and a control mechanism for controlling the rotation of the driving gear. The control mechanism includes a housing and a control motor installed in the housing. A first bevel gear is provided on the output shaft of the control motor. The driving gear is connected with a second bevel gear through a transmission shaft. The first bevel gear and the second bevel gear are meshed for transmission. The transmission shaft is rotatably connected to the housing through a bearing.

[0010] Preferably, as an improvement, the automatic driving mechanism further includes a first reciprocating driving mechanism for pushing the control mechanism to move reciprocally, and the moving direction is perpendicular to the axis direction of the adjusting gear.

[0011] Preferably, as an improvement, an angle adjusting mechanism is also provided on the test platform. The angle adjusting mechanism includes an angle rack and a toothed ring coaxially fixed on the peripheral wall of the limiting disk. The angle rack meshes with the toothed ring for transmission. A second reciprocating driving mechanism is connected to the angle rack. The second reciprocating driving mechanism includes a driving motor. A lead screw is provided at the output end of the driving motor. A threaded seat is threadedly connected to the lead screw. A slider is fixedly connected to the threaded seat. The slider is slidably connected to the test platform. The angle rack is fixedly connected to the side wall of the slider.

[0012] Preferably, as an improvement, the locking structure at least includes one locking gear. The locking gear is detachably connected to the turntable and meshes with the adjusting gear.

[0013] Preferably, as an improvement, the locking gear is detachably connected to the turntable through a fastener. The fastener includes a pressing block and a connecting shaft fixed to the bottom of the pressing block. The connecting shaft includes a threaded section and a smooth section, and an anti-slip pad is provided at the bottom of the pressing block.

[0014] A test method applicable to different types of torsion spring fatigue includes the following steps:

[0015] Adjustment of the installation angle of the torsion spring: Insert the torsion spring onto the torsion spring installation post. One leg of the torsion spring abuts against the first limit plate. Observe whether the other leg of the torsion spring abuts against the second limit plate. If it does not abut or abuts excessively, start the angle rack to drive the toothed rings on each limit disc to rotate, so that the second limit plate on the limit disc abuts against the other leg of the torsion spring with an appropriate force.

[0016] Amplitude adjustment: Adjust the test amplitude of this system according to the amplitude sizes of different types of torsion springs. First, loosen the locking structure to make the adjustment gear in a freely rotating state. Rotate the adjustment gear to make the amplitude connecting rod above it rotate a certain angle, so that the rotation point of the amplitude connecting rod approaches or moves away from the center point of the turntable, so as to adjust the stroke size of the subsequent work of the amplitude connecting rod. Then lock the locking structure to fix the adjustment gear by the locking structure to complete the amplitude adjustment.

[0017] Fatigue test: Start the turntable to rotate. The turntable drives the test rack to move linearly back and forth through the eccentric amplitude connecting rod. The test rack then drives the test gears on both sides to rotate back and forth, thereby pushing the legs of the torsion spring to swing back and forth to test its service life.

[0018] Preferably, as an improvement, it further includes a shape matching step: According to the shapes of the legs of the torsion spring, replace the matching blocks on the first limit plate or the second limit plate that match their shapes.

[0019] The principle and advantages of this solution are:

[0020] 1. High test efficiency: On the one hand, this solution can test multiple torsion springs in batches; on the other hand, this solution overcomes the traditional method of driving by the forward and reverse rotation of the motor. Instead, it drives the test rack to move linearly back and forth by driving the eccentric amplitude connecting rod through the single-direction rotation of the motor, thereby driving the torsion springs on multiple test gears for testing. Therefore, this solution does not need to overcome the rotational inertia during commutation, and the test frequency is greatly improved. The minimum can reach 1200 times / min, and the test efficiency is nearly 20 times higher than that of the traditional test system.

[0021] 2. Batch adjustment: Since there are many types of torsion springs, and the test amplitudes and test angles of different types of torsion springs are different, it is particularly important to be able to batch adjust the amplitudes and test angles of each torsion spring test unit while batch testing several torsion springs. To achieve this effect, in this solution, through double eccentric settings, only by rotating the adjustment gear by a certain angle, the adjustment of the test stroke amplitudes of several torsion springs can be achieved; during angle adjustment, only by starting the driving motor, the initial angle adjustment of several torsion springs can be achieved. In this way, the operation process between different types of torsion spring field changes is greatly reduced, and the field change efficiency is improved.

[0022] 3. Automatic and precise adjustment: In this solution, by setting up an automatic driving mechanism, when the amplitude needs to be adjusted, the first reciprocating driving mechanism pushes the driving gear to mesh with the adjustment gear. According to the transmission ratio between the two gears, the rotation of the driving gear drives the adjustment gear to rotate by a certain angle, and the amplitude adjustment can be accurately completed. Description of the Drawings

[0023] Figure 1 Is an isometric view of the present invention.

[0024] Figure 2 Is Figure 1 The top view of.

[0025] Figure 3 Is a schematic diagram of the internal structure of the present invention.

[0026] Figure 4 Is Figure 3 The partial enlarged view of A in.

[0027] Figure 5 Is the adjustment state diagram of the amplitude device and the automatic driving mechanism.

[0028] Figure 6 Is the structural schematic diagram of the torsion spring installation device. Detailed Description of the Invention

[0029] The following is a further detailed description through specific embodiments:

[0030] The reference numerals in the drawings of the specification include: test platform 1, amplitude device 2, amplitude connecting rod 21, turntable 22, adjustment gear 23, round table 24, locking gear 25, torsion spring installation device 3, turntable 31, torsion spring installation column 32, first limiting plate 33, limiting disk 34, second limiting plate 35, matching block 36, angle adjustment mechanism 4, angle rack 41, tooth ring 42, driving motor 43, lead screw 44, threaded seat 45, slider 46, test device 5, test gear 51, test rack 52, driving gear 6, control mechanism 7, driving cylinder 8, torsion spring 9.

[0031] The embodiment is basically as shown in the attached Figures 1-6Shown: A fatigue test system and its test method applicable to different types of torsion springs, including a test platform 1, an amplitude device 2, a test device 5, and at least one torsion spring mounting device 3 mounted on the test platform 1. In this embodiment, there are eight torsion spring mounting devices 3, which are divided into two parallel rows, and the two rows of torsion spring mounting devices 3 are symmetrically arranged along the axis of the test device 5. In this way, when the test device 5 moves, it can drive the eight torsion spring mounting devices 3 to move simultaneously, and the tests of eight torsion springs 9 can be completed batch by batch, greatly improving the test efficiency.

[0032] In order to show that this system can test torsion springs of different models, the scenarios of different torsion springs mounted on each torsion spring mounting device are shown in Figures 1-4 . However, during actual testing, for the testing of torsion springs in the same batch, the same model of torsion springs is tested on each torsion spring mounting device 3.

[0033] As Figure 5 shown, the amplitude device 2 includes a turntable 22 and an amplitude connecting rod 21 eccentrically connected to the turntable 22. An amplitude adjusting mechanism for adjusting the stroke size of the amplitude connecting rod 21 is also provided on the turntable 22. The amplitude adjusting mechanism includes an adjusting gear 23 and a locking structure for locking the adjusting gear 23. The adjusting gear 23 is eccentrically rotatably connected to the upper surface of the turntable 22, and one end of the amplitude connecting rod 21 is eccentrically rotatably connected to the upper surface of the adjusting gear 23. Specifically, a frustum 24 is eccentrically provided on the upper surface of the adjusting gear 23, and the frustum 24 is rotatably connected to one end of the amplitude connecting rod 21 through a bearing. The locking structure includes at least one locking gear 25. In this embodiment, 3 locking gears 25 are preferably used. The locking gear 25 is detachably connected to the turntable 22, such as by threaded connection, and the locking gear 25 meshes with the adjusting gear 23. In this way, when it is necessary to adjust the amplitude test size according to the different specifications of the tested torsion spring 9, the locking gear 25 is removed to make the adjusting gear 23 in a free state. After adjusting the adjusting gear 23, the locking gear 25 is fixed to lock the adjusting gear 23 and prevent the adjusting gear 23 from rotating under normal working conditions.

[0034] In order to improve the convenience during the adjustment process, in this embodiment, the locking gear 25 is detachably connected to the turntable 22 through fasteners. Specifically, a through hole is provided at the center of the locking gear 25. The fasteners include a pressing block and a connecting shaft integrally formed at the bottom of the pressing block. The connecting shaft includes a threaded section and a smooth section. The connecting shaft of the fastener passes through its through hole and is threadedly connected to the turntable 22. The smooth section of the connecting shaft corresponds to the through hole of the locking gear 25. An anti-slip pad is provided at the bottom of the pressing block, and a hexagonal slot is provided at the upper part of the pressing block, or a flat opening is provided on the peripheral wall of the pressing block to facilitate screwing the pressing block with a wrench or other tools. In this way, when adjustment is required, only need to screw the fastener upward by a certain distance to slightly separate the pressing block from the locking gear 25, so that the locking gear 25 is in a free rotation state, and thus the adjusting gear 23 is in a free state. After adjustment, only need to slightly screw the fastener to make the pressing block press the locking gear 25 tightly.

[0035] In order to make this test system achieve automatic adjustment, an automatic driving mechanism for automatically adjusting the amplitude adjustment mechanism is provided on the test platform 1, such as Figure 5 shown, the automatic driving mechanism includes a driving gear 6 for meshing with the adjusting gear 23 and a control mechanism 7 for controlling the rotation of the driving gear 6. The control mechanism 7 includes a housing and a control motor installed in the housing. The housing is slidably installed on the test platform 1 through a guide rail; a first bevel gear is fixedly provided on the output shaft of the control motor. The driving gear 6 is connected with a second bevel gear through a transmission shaft. The first bevel gear and the second bevel gear are meshed and driven, and the transmission shaft is rotatably connected to the housing through a bearing. The automatic driving mechanism further includes a first reciprocating driving mechanism for pushing the control mechanism 7 to move reciprocally. The first reciprocating driving mechanism can adopt a driving cylinder 8. The output shaft of the driving cylinder 8 is fixedly connected to the housing, and the moving direction of the housing is towards the axis direction of the adjusting gear 23. In this way, when the amplitude needs to be adjusted, the driving cylinder 8 pushes the control mechanism 7 to move towards the adjusting gear 23 until the driving gear 6 meshes with the adjusting gear 23, and then the control motor controls the driving gear 6 to drive the adjusting gear 23 to rotate for amplitude adjustment. When the adjustment is completed, the driving cylinder 8 drives the control mechanism 7 to disengage from the adjusting gear 23.

[0036] As Figure 6 shown, the torsion spring installation device 3 includes a turntable 31 rotatably connected to the test platform 1. Specifically: a rotating shaft is coaxially and fixedly connected to the bottom of the turntable 31. The rotating shaft is rotatably connected to the test platform 1 through a bearing. A torsion spring installation post 32 is fixedly installed at the center of the upper surface of the turntable 31. A first limiting plate 33 is eccentrically provided on the turntable 31. A limiting disk 34 is coaxially rotatably connected to the outer periphery of the turntable 31, and a second limiting plate 35 is provided on the limiting disk 34.

[0037] Since the foot shapes of torsion springs 9 of various specifications are different, with arc-shaped, flat, inconsistent upper and lower angles, and short foot lengths, in order to ensure the test accuracy, a matching block 36 is detachably connected to the second limit plate 35. The matching block 36 is designed according to the shape of the foot of the torsion spring 9. Thus, different matching blocks 36 can be selected and installed when testing different torsion springs 9.

[0038] As Figure 3 shown, an angle adjustment mechanism 4 is further provided on the test platform 1. The angle adjustment mechanism 4 includes an angle rack 41 and a gear ring 42 coaxially fixed on the peripheral wall of the limit disk 34. A second reciprocating drive mechanism is connected to the angle rack 41. The second reciprocating drive mechanism includes a drive motor 43 fixed on the test platform 1. The output end of the drive motor 43 is fixedly installed with a lead screw 44. The other end of the lead screw is rotatably connected to the test platform 1. A threaded seat 45 is threadedly connected to the lead screw. A slider 46 is fixedly connected to the threaded seat 45. A chute is provided at the bottom of the slider 46. A slide rail matching the chute is provided on the test platform 1, so that the slide rail stably slides on the test platform 1. The angle rack 41 is fixedly connected to both side walls of the slider 46. The two angle racks 41 are respectively engaged and driven with the corresponding gear rings 42 on the left and right sides.

[0039] As Figure 3 、 Figure 4 shown, the test device 5 includes a test gear 51 and a test rack 52. The test gear 51 is coaxially fixed on the rotating shaft and is located below the turntable 31. The test rack 52 has a cuboid structure, and a plurality of weight-reducing holes are provided in the middle thereof. Teeth meshing with the test gear 51 are respectively provided on both sides of the test rack 52. A chute block is fixedly installed at the bottom of the test rack 52. A slide rail matching the chute block is also fixedly installed on the test platform 1, so that the test rack 52 stably makes a linear reciprocating motion on the test platform 1.

[0040] A method applied to fatigue tests of different types of torsion springs includes the following steps:

[0041] Adjustment of the installation angle of the torsion spring: Insert the torsion spring 9 onto the torsion spring installation post 32, and rotate the torsion spring 9 so that one of its feet abuts against the first limit plate 33. Observe whether the other foot of the torsion spring 9 abuts against the second limit plate 35. If it does not abut or abuts excessively, start the drive motor 43. The drive motor 43 drives the angle rack 41 to move linearly through the cooperation of the lead screw and the threaded seat 45. The angle rack 41 drives the gear rings 42 on each limit disk 34 to rotate, thereby driving the second limit plate 35 to abut against the other foot of the torsion spring 9 with a proper force.

[0042] Amplitude adjustment: Adjust the test amplitude according to the type of torsion spring 9. First, loosen the locking gear 25 to make the adjusting gear 23 in a freely rotating state. Then start the driving cylinder 8. The driving cylinder 8 pushes the control mechanism 7 towards the adjusting gear 23 until the driving gear 6 meshes with the adjusting gear 23. Start the control motor, and control the driving gear 6 to drive the adjusting gear 23 to rotate a certain angle. For example, if it rotates a certain angle clockwise from the state in the figure, the test amplitude becomes smaller. When the round platform 24 on the adjusting gear 23 rotates to coincide with the center of the turntable 22, the amplitude is zero. After the amplitude adjustment is completed, tighten the locking gear 25 downward to fix the adjusting gear 23 and prevent the adjusting gear 23 from having an angular deviation during the test state. Finally, the driving cylinder 8 drives the control mechanism 7 to move leftward to disengage from the adjusting gear 23, completing the amplitude adjustment.

[0043] Fatigue test: Start the rotation of the turntable 22. The turntable 22 drives the test rack 52 to perform a linear reciprocating movement through the eccentric amplitude connecting rod 21. The test rack 52 then drives the test gears 51 on both sides to rotate back and forth, thereby pushing the feet of the torsion spring 9 to swing reciprocally to test its service life.

[0044] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. Applied to fatigue test systems for different types of torsion springs, characterized in that: It includes a test platform, an amplitude device, a test device, and at least one torsion spring mounting device installed on the test platform. The amplitude device includes a turntable and an amplitude connecting rod eccentrically connected to the turntable. An amplitude adjustment mechanism for adjusting the stroke size of the amplitude connecting rod is also provided on the turntable. The torsion spring mounting device includes a turntable rotatably connected to the test platform. A torsion spring mounting post is provided at the center of the turntable. A first limiting plate is eccentrically provided on the turntable. A limiting disk is coaxially and rotatably connected to the outer periphery of the turntable. A second limiting plate is provided on the limiting disk. The test device includes a test gear and a test rack. The test gear is coaxially arranged with the turntable. The test rack is rotatably connected to the amplitude connecting rod and meshes with the test gear for transmission.

2. The application to a fatigue test system for different types of torsion springs according to claim 1, wherein: The amplitude adjustment mechanism includes an adjustment gear and a locking structure for locking the adjustment gear. The adjustment gear is eccentrically and rotatably connected to the turntable. One end of the amplitude connecting rod away from the test rack is eccentrically and rotatably connected to the adjustment gear.

3. The application to a fatigue test system for different types of torsion springs according to claim 2, characterized in that: An automatic drive mechanism for automatically adjusting the amplitude adjustment mechanism is also provided on the test platform. The automatic drive mechanism includes a drive gear for meshing with the adjustment gear and a control mechanism for controlling the rotation of the drive gear. The control mechanism includes a housing and a control motor installed in the housing. A first bevel gear is provided on the output shaft of the control motor. The drive gear is connected with a second bevel gear through a transmission shaft. The first bevel gear and the second bevel gear are in meshing transmission. The transmission shaft is rotatably connected to the housing through a bearing.

4. The application to different types of torsion spring fatigue test systems according to claim 3, characterized in that: The automatic drive mechanism further includes a first reciprocating drive mechanism for pushing the control mechanism to move reciprocally. The moving direction is perpendicular to the axis direction of the adjustment gear.

5. The application to different types of torsion spring fatigue test systems according to claim 4, characterized in that: An angle adjustment mechanism is also provided on the test platform. The angle adjustment mechanism includes an angle rack and a toothed ring coaxially fixed on the peripheral wall of the limiting disk. The angle rack meshes with the toothed ring for transmission. A second reciprocating drive mechanism is connected to the angle rack. The second reciprocating drive mechanism includes a drive motor. A lead screw is provided at the output end of the drive motor. A threaded seat is threadedly connected to the lead screw. A slider is fixedly connected to the threaded seat. The slider is slidably connected to the test platform. The angle rack is fixedly connected to the side wall of the slider.

6. The application to a fatigue test system for different types of torsion springs according to claim 5, characterized in that: The locking structure at least includes one locking gear. The locking gear is detachably connected to the turntable and meshes with the adjustment gear.

7. The application to different types of torsion spring fatigue test systems according to claim 6, characterized in that: The locking gear is detachably connected to the turntable through a fastener. The fastener includes a pressing block and a connecting shaft fixed to the bottom of the pressing block. The connecting shaft includes a threaded section and a smooth section. An anti-slip pad is provided at the bottom of the pressing block.

8. The test method for fatigue of different types of torsion springs according to claim 7, characterized in that: It includes the following steps: Adjustment of the torsion spring installation angle: Insert the torsion spring onto the torsion spring mounting post. One leg of the torsion spring abuts against the first limiting plate. Observe whether the other leg of the torsion spring abuts against the second limiting plate. If it does not abut or abuts excessively, start the angle rack to drive the toothed ring on each limiting disk to rotate, so that the second limiting plate on the limiting disk abuts against the other leg of the torsion spring with a suitable force. Amplitude adjustment: Adjust the test amplitude of this system according to the amplitude of different types of torsion springs. First, loosen the locking structure to make the adjusting gear in a freely rotating state. Rotate the adjusting gear to make the amplitude connecting rod above it rotate by a certain angle, so that the rotation point of the amplitude connecting rod approaches or moves away from the center point of the turntable, so as to adjust the stroke size of the subsequent work of the amplitude connecting rod. Then lock the locking structure to fix the adjusting gear by the locking structure and complete the amplitude adjustment; Fatigue test: Start the turntable to rotate. The turntable drives the test rack to move linearly back and forth through the eccentric amplitude connecting rod. The test rack then drives the test gears on both sides to rotate back and forth, thereby pushing the feet of the torsion spring to swing back and forth to test its service life.

9. The test method for different types of torsion spring fatigue according to claim 8, characterized in that: It also includes a shape matching step: Replace the matching block with a shape matching the shape of each foot of the torsion spring on the first limit plate or the second limit plate.

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