A bending fatigue performance testing machine

Abstract

This invention discloses a bending fatigue performance testing machine, relating to the field of material performance testing. A support panel is disposed on the upper part of the frame. A rotary drive component has a through-hole at its upper end and a turntable is mounted thereon. A positioning component is disposed on the upper part of the turntable. A mounting base is disposed on the upper part of the support panel. A clamping component and a first linear drive component are sequentially disposed on the upper part of the mounting base from front to back. A second bracket is disposed at the end of the first linear drive component near the turntable, and a second U-shaped pulley is rotatably mounted on the second bracket. A first bracket is disposed at the end of the mounting base near the turntable, and a first U-shaped pulley is rotatably mounted on the first bracket. The clamping component is used to clamp one end of the workpiece, and the other end of the workpiece can pass between the first and second U-shaped pulleys and protrude from the positioning component. This bending fatigue performance testing machine can achieve bending and retraction of the workpiece, avoiding damage to the workpiece surface and improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of material performance testing, and in particular to a bending fatigue performance testing machine. Background Technology

[0002] With the rapid development of the power industry, the requirements for the bending resistance of metal components widely used in power facilities are increasing. However, the quality of materials in the power industry varies greatly, and there is a lack of equipment capable of quickly testing material properties. Currently, most bending machines use two non-rotating shafts for bending, making it difficult to complete the re-folding of the workpiece after bending. Controlling the bending angle relies on adjusting various components, and adjusting the relative positions of the workpiece and fixture for different bending angles requires a significant amount of time, resulting in low efficiency in testing the workpiece's bending resistance. Furthermore, the quality of the surface coating of materials in the power industry is crucial to the safety of the entire power system. The non-rotating pivot shafts can damage the surface coating of the workpiece during bending, reducing its service life. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a bending fatigue performance testing machine that can bend and fold back the workpiece, avoid damage to the workpiece surface, and improve testing efficiency.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a bending fatigue performance testing machine, comprising a frame, a support panel, a mounting base, a clamping assembly, a mounting seat, a first bracket, a first U-shaped pulley, a first linear drive component, a second bracket, a second U-shaped pulley, a rotary drive component, a turntable, a positioning assembly, and a controller. The support panel is disposed on the upper part of the frame and has a through hole. The rotary drive component is disposed on the lower part of the support panel, with its upper end passing through the through hole and housing the turntable. The positioning assembly is disposed on the upper part of the turntable. The mounting base is disposed on the upper part of the support panel. The clamping assembly and the first linear drive component are sequentially disposed on the upper part of the mounting base from front to back. The clamping assembly is located on the front side of the turntable, and the first linear drive component is located on the right side of the turntable. The first linear drive component has a second bracket at one end near the turntable. The second U-shaped pulley is rotatably mounted on the second bracket. The mounting base is located on the mounting frame and between the turntable and the clamping assembly. The first bracket is located at one end of the mounting base near the turntable. The first U-shaped pulley is rotatably mounted on the first bracket. The axes of the first U-shaped pulley and the second U-shaped pulley are both vertically arranged. The clamping assembly is used to clamp one end of the workpiece. The other end of the workpiece can pass between the first U-shaped pulley and the second U-shaped pulley and extend out from the positioning assembly. The workpiece can slide relative to the positioning assembly. The rotary drive component is connected to the controller and is used to drive the turntable to rotate relative to the mounting frame under the action of the controller.

[0006] Preferably, the turntable includes a turntable plate and a sleeve fixed to one side of the lower part of the turntable plate, and the sleeve is connected to the upper end of the rotary drive component.

[0007] Preferably, it further includes a limiting plate and a locking bolt, the rotary drive component is connected to the sleeve key, the limiting plate is disposed on the upper part of the rotating plate, and the locking bolt passes through the limiting plate and is threaded onto the power output shaft of the rotary drive component.

[0008] Preferably, the positioning assembly includes a base plate, a U-shaped bracket, a top plate, and rollers. The base plate is fixed to one side of the upper part of the turntable, the two ends of the top plate are respectively fixed to the upper end of the U-shaped bracket, and the two ends of each roller are respectively rotatably mounted on the top plate.

[0009] Preferably, the clamping assembly includes a fixed clamping plate, a movable clamping plate, and a second linear drive component. The fixed clamping plate and the second linear drive component are respectively disposed on both sides of the upper front end of the mounting base. The movable clamping plate is disposed at one end of the second linear drive component near the fixed clamping plate. The movable clamping plate is driven by the linear drive component to move relative to the fixed clamping plate along the axial direction of the first linear drive component, so as to move closer to or away from the fixed clamping plate.

[0010] Preferably, the axis of the first linear drive component is parallel to the axis of the second linear drive component, the first linear drive component is a first push-pull clamp, and the second linear drive component is a second push-pull clamp.

[0011] Preferably, it further includes a first bearing, a second bearing, a first pin, and / or a second pin. The first bracket and / or the second bracket are U-shaped structures. The first U-shaped pulley is mounted on the first bracket via the first bearing and the first pin, and / or the second U-shaped pulley is mounted on the second bracket via the second bearing and the second pin.

[0012] Preferably, the system further includes a first ranging sensor and a second ranging sensor, which are disposed on the mounting base and both are connected to the controller.

[0013] Preferably, the controller is mounted on the frame, the rotary drive component is a bipolar cycloidal pinwheel reducer motor, the first ranging sensor is a first photoelectric ranging sensor, and the second ranging sensor is a second photoelectric ranging sensor.

[0014] The present invention achieves the following technical effects compared to the prior art:

[0015] The bending fatigue performance testing machine of the present invention has a clamping assembly that can clamp one end of a workpiece, and the other end of the workpiece can pass between a first U-shaped pulley and a second U-shaped pulley and extend out from a positioning assembly. The workpiece can slide relative to the positioning assembly. During operation, a rotary drive component drives a turntable and a positioning assembly on the turntable to rotate. During bending, one end of the workpiece is clamped by the clamping assembly, and the rotary drive component is controlled to drive the turntable and positioning assembly to rotate to one side. The first U-shaped pulley is used as a fulcrum to bend the workpiece, and the rotation angle of the turntable is controlled by the rotary drive component, thereby controlling the bending angle of the workpiece. During retraction, a first linear drive component drives a second U-shaped pulley to move along the axial direction of the first linear drive component, thereby adjusting the contact position between the second U-shaped pulley and the workpiece. After the contact position adjustment is completed, the workpiece is retracted using the second U-shaped pulley as a fulcrum. This device can realize the bending and retraction of the workpiece. Simultaneously, the first U-shaped pulley is rotatably mounted on the first support, and the second U-shaped pulley is rotatably mounted on the second support. The first and second U-shaped pulleys can rotate simultaneously with the workpiece during bending and folding, avoiding significant relative friction with the workpiece during bending and folding that could damage the workpiece surface. In this invention, the movement of the rotary drive component is controlled by a controller, enabling control of the workpiece bending angle and improving testing efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of the bending fatigue performance testing machine provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the frame of the bending fatigue performance testing machine provided by the present invention;

[0019] Figure 3 A top view of the bending fatigue performance testing machine provided by the present invention;

[0020] Figure 4 This is a schematic diagram of the bending fatigue performance testing machine provided by the present invention after removing the frame;

[0021] Figure 5 A schematic diagram of the turntable and positioning assembly of the bending fatigue performance testing machine provided by the present invention;

[0022] Figure 6An exploded view of the assembly of the first U-shaped pulley and the first support in the bending fatigue performance testing machine provided by the present invention;

[0023] Figure 7 This is a top view of the bending fatigue performance testing machine provided by the present invention after the workpiece is installed.

[0024] Explanation of reference numerals in the attached drawings: 100, Bending fatigue performance testing machine; 1, Frame; 2, Support panel; 3, Mounting base; 4, First linear drive component; 5, First bracket; 51, First vertical main plate; 52, First horizontal side plate; 6, First U-shaped pulley; 7, First bearing; 8, Second bracket; 9, Second U-shaped pulley; 10, Fixed clamping plate; 11, Moving clamping plate; 12, Second linear drive component; 13, Mounting base; 14, First distance sensor; 15, Second distance sensor; 16, Rotary drive component; 17, Turning plate; 18, Sleeve; 19, Limiting plate; 20, Locking bolt; 21, Base plate; 22, Horizontal plate; 23, Vertical plate; 24, Top plate; 25, Roller; 26, Controller; 27, Caster with brake; 28, Workpiece. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The purpose of this invention is to provide a bending fatigue performance testing machine that can achieve bending and folding of workpieces, avoid damage to the workpiece surface, and improve testing efficiency.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-7As shown, this embodiment provides a bending fatigue performance testing machine 100, including a frame 1, a support panel 2, a mounting base 3, a clamping assembly, a mounting seat 13, a first bracket 5, a first U-shaped pulley 6, a first linear drive component 4, a second bracket 8, a second U-shaped pulley 9, a rotary drive component 16, a turntable, a positioning assembly, and a controller 26. The support panel 2 is disposed on the upper part of the frame 1, and a through hole is provided on the support panel 2. The rotary drive component 16 is disposed on the lower part of the support panel 2, and the upper end of the rotary drive component 16 passes through the through hole and is provided with a turntable. The rotary drive component 16 is used to drive... The turntable rotates, with the positioning component located on the upper part of the turntable. The mounting base 3 is located on the upper part of the support panel 2. The clamping component and the first linear drive component 4 are sequentially arranged on the upper part of the mounting base 3 from front to back. The clamping component is located on the front side of the turntable, and the first linear drive component 4 is located on the right side of the turntable. The axis of the first linear drive component 4 is horizontally arranged. A second bracket 8 is provided at one end of the first linear drive component 4 near the turntable. The second U-shaped pulley 9 is rotatably mounted on the second bracket 8. The first linear drive component 4 can adjust the position of the second U-shaped pulley 9, thereby adjusting the position of the fulcrum for folding back. Mounting base 13 is mounted on mounting base 3 and located between turntable and clamping assembly. One end of mounting base 13 near turntable is provided with first bracket 5. First U-shaped pulley 6 is rotatably mounted on first bracket 5. The axis of first U-shaped pulley 6 and the axis of second U-shaped pulley 9 are both vertically arranged. Clamping assembly is used to clamp one end of workpiece 28. The other end of workpiece 28 can pass between first U-shaped pulley 6 and second U-shaped pulley 9 and protrude from positioning assembly. Workpiece 28 can slide relative to positioning assembly. Rotation drive component 16 is connected to controller 26.

[0029] Applying the technical solution of this embodiment, during bending, one end of the workpiece is clamped by the clamping assembly, and the rotary drive component is controlled to drive the turntable and positioning assembly to rotate to one side. The first U-shaped pulley is used as a fulcrum to bend the workpiece, and the rotation angle of the turntable is controlled by the rotary drive component, thereby controlling the bending angle of the workpiece. During retraction, the first linear drive component drives the second U-shaped pulley to move along the axis of the first linear drive component, adjusting the contact position between the second U-shaped pulley and the workpiece. After the contact position adjustment is completed, the workpiece is retracted using the second U-shaped pulley as a fulcrum. This device can realize both bending and retraction of the workpiece. Simultaneously, the first U-shaped pulley is rotatably mounted on the first bracket, and the second U-shaped pulley is rotatably mounted on the second bracket. The first and second U-shaped pulleys can rotate simultaneously with the workpiece during bending and retraction, avoiding significant relative friction with the workpiece during bending and retraction that could damage the workpiece surface.

[0030] like Figure 5As shown, the turntable includes a turntable 17 and a sleeve 18 fixed to one side of the lower part of the turntable 17. The sleeve 18 is connected to the upper end of the rotary drive component 16. The power output shaft of the rotary drive component 16 is vertically arranged. The through hole on the support panel 2 is a circular hole. The central axis of the power output shaft of the rotary drive component 16 is collinear with the central axis of the through hole.

[0031] This embodiment also includes a limiting plate 19 and a locking bolt 20. A key block is provided on the power output shaft of the rotary drive component 16, and a keyway matching the key block structure is provided on the inner wall of the sleeve 18. The sleeve 18 is sleeved on the power output shaft of the rotary drive component 16. The sleeve 18 and the power output shaft of the rotary drive component 16 are circumferentially limited by the cooperation of the key block and the keyway. The lower end of the sleeve 18 is limited by the shoulder on the power output shaft of the rotary drive component 16. The upper end of the power output shaft of the rotary drive component 16 extends to the outside through the top surface of the rotating plate 17. The rotating plate 17 has a circular hole corresponding to the position of the sleeve 18. The limiting plate 19 is located on the upper part of the rotating plate 17. The limiting plate 19 is a circular plate with a diameter larger than that of the circular hole. The locking bolt 20 passes through the limiting plate 19 and is threaded onto the power output shaft of the rotary drive component 16, thereby limiting the upper ends of the sleeve 18 and the rotating plate 17. The sleeve 18 and the rotating plate 17 are limited in the vertical direction through the cooperation of the shaft shoulder, the limiting plate 19 and the locking bolt 20, thereby fixing the turntable and the power output shaft of the rotary drive component 16.

[0032] like Figure 5 As shown, the positioning assembly includes a base plate 21, a U-shaped bracket, a top plate 24, and two rollers 25. The base plate 21 is fixed to the other side of the upper part of the rotating plate 17. The U-shaped bracket includes a horizontal plate 22 and two vertical plates 23 respectively disposed at both ends of the upper part of the horizontal plate 22. The horizontal plate 22 is fixed to the base plate 21. The two ends of the top plate 24 are respectively fixed to the upper ends of the two vertical plates 23. The two ends of each roller 25 are rotatably mounted on the top plate 24 and the horizontal plate 22. Specifically, the two ends of the roller 25 are rotatably mounted on the top plate 24 and the horizontal plate 22 through bearings. The end of the workpiece 28 can extend to the outside through the space between the two rollers 25. The two rollers 25 play a positioning role during the bending process of the workpiece 28. During the bending and retraction of the workpiece 28, the rollers 25 can rotate simultaneously with the workpiece 28, thereby avoiding damage to the surface of the workpiece 28. Specifically, the base plate 21 is fixed to the rotating plate 17 by bolts, and the top plate 24 is fixed to the vertical plate 23 by bolts.

[0033] The clamping assembly includes a fixed clamping plate 10, a movable clamping plate 11, and a second linear drive component 12. The fixed clamping plate 10 and the second linear drive component 12 are respectively disposed on both sides of the upper front end of the mounting base 3. The movable clamping plate 11 is disposed at the end of the second linear drive component 12 near the fixed clamping plate 10. The second linear drive component 12 can drive the movable clamping plate 11 to move towards the fixed clamping plate 10, thereby clamping the workpiece 28. Specifically, the movable clamping plate 11 is fixed to the end of the second linear drive component 12 by bolts.

[0034] This embodiment also includes a first ranging sensor 14 and a second ranging sensor 15. The first ranging sensor 14 is mounted on the mounting base 3 and is located on the rear side of the first linear drive component 4 and the right side of the turntable. The second ranging sensor 15 is mounted on the mounting base 3 and is located on the left side of the mounting base 13. Both the first ranging sensor 14 and the second ranging sensor 15 are connected to the controller 26.

[0035] The first distance sensor 14 is used to monitor the distance between the vertical plate 23 on the right side of the positioning assembly and the first distance sensor 14, thereby preventing the positioning assembly from colliding with the mounting base 3 when folding back. Specifically, when the first distance sensor 14 detects that the distance is too small, the controller 26 controls the rotation drive component 16 to stop working. The second distance sensor 15 is used to monitor the distance between the vertical plate 23 on the left side of the positioning assembly and the second distance sensor 15, thereby preventing the positioning assembly from colliding with the mounting base 3 when bending. Specifically, when the second distance sensor 15 detects that the distance is too small, the controller 26 controls the rotation drive component 16 to stop working.

[0036] In this specific embodiment, the support panel 2 is fixed to the frame 1 by bolts, the rotary drive component 16 is fixed to the lower surface of the support panel 2 by bolts, the mounting base 3 is fixed to the support panel 2 by bolts, and the first ranging sensor 14, the second ranging sensor 15, the first linear drive component 4, the second linear drive component 12, the fixing clamp 10 and the mounting base 13 are all fixed to the mounting base 3 by bolts.

[0037] In this embodiment, the top surface of the mounting base 3 is the working surface, which is parallel to the support panel 2. The mounting base 3 has an L-shaped structure and includes a first base and a second base that are perpendicular to each other. The first base is located at the front end of the upper part of the support panel 2 and extends in the left-right direction. The second base is located at the right end of the upper part of the support panel 2 and extends in the front-back direction. The first ranging sensor 14 and the first linear drive component 4 are both located on the second base. The second ranging sensor 15, the mounting base 13, the fixing clamp 10, and the second linear drive component 12 are all located on the first base.

[0038] Specifically, the axis of the first linear drive component 4 is parallel to the axis of the second linear drive component 12, and the length direction of the workpiece 28 after placement is perpendicular to the axial directions of the first linear drive component 4 and the second linear drive component 12. In this specific embodiment, the first linear drive component 4 is a first push-pull clamp, and the second linear drive component 12 is a second push-pull clamp.

[0039] like Figure 6 As shown, this embodiment also includes two first bearings 7 and two first pins. The first bracket 5 includes a first vertical main plate 51 and two first horizontal side plates 52 respectively disposed at the upper and lower ends of one side of the first vertical main plate 51. The first vertical main plate 51 is fixed to the mounting base 13. Specifically, the first vertical main plate 51 is fixed to the mounting base 13 by bolts. The first U-shaped pulley 6 is located between the two first horizontal side plates 52. The first U-shaped pulley 6 has a first center hole in the middle. The outer rings of the two first bearings 7 are respectively interference-fitted into the two first center holes. At the end, one end of each first pin is interference-fitted into the inner ring of a first bearing 7, and the other end of each first pin is fixed to a first horizontal side plate 52, thereby allowing the first U-shaped pulley 6 to rotate relative to the first bracket 5. During the bending process of the workpiece 28, the first U-shaped pulley 6 rotates together with the workpiece 28, and the surface of the workpiece 28 and the groove surface of the first U-shaped pulley 6 are relatively stationary, avoiding stress concentration on the workpiece 28 during bending and dynamic friction between the surface of the workpiece 28 and the surface of the first U-shaped pulley 6, which could lead to damage to the surface of the workpiece 28. Specifically, the first bearing 7 is a first deep groove ball bearing.

[0040] This embodiment also includes two second bearings and two second pins. The second bracket 8 includes a second vertical main plate and two second horizontal side plates respectively disposed at the upper and lower ends of one side of the second vertical main plate. The second vertical main plate is fixed to the first linear drive component 4. Specifically, the second vertical main plate is fixed to the end of the first linear drive component 4 by bolts. The second U-shaped pulley 9 is located between the two second horizontal side plates. The second U-shaped pulley 9 has a second center hole in the middle. The outer rings of the two second bearings are respectively interference-fitted to the two ends in the second center hole. One end of each second pin is interference-fitted to the inner ring of a second bearing, and the other end of each second pin is fixed to a second horizontal side plate, thereby enabling the second U-shaped pulley 9 to rotate relative to the second bracket 8. During the folding process of the workpiece 28, the second U-shaped pulley 9 rotates together with the bending of the workpiece 28. The surface of the workpiece 28 and the groove surface of the second U-shaped pulley 9 are relatively stationary, avoiding stress concentration of the workpiece 28 during the bending process and dynamic friction between the surface of the workpiece 28 and the surface of the second U-shaped pulley 9, which would cause damage to the surface of the workpiece 28. Specifically, the second bearing is a second deep groove ball bearing.

[0041] Specifically, the controller 26 is located on the right side of the frame 1. In this embodiment, the controller 26 is a PLC controller. The rotary drive component 16 is a bipolar cycloidal pinwheel reducer motor. The controller 26 can control the speed and rotation angle of the bipolar cycloidal pinwheel reducer motor. The bipolar cycloidal pinwheel reducer motor and the reducer are integrated and fixed to the lower surface of the support panel 2 by bolts. The first ranging sensor 14 is a first photoelectric ranging sensor, and the second ranging sensor 15 is a second photoelectric ranging sensor.

[0042] By applying the technical solution of this embodiment, the movement of the rotary drive component can be controlled by the controller to achieve control of the workpiece bending angle, thereby improving the efficiency of the test.

[0043] In this specific embodiment, the frame 1 is a cube structure, serving as the overall support for all parts. The bottom is equipped with four casters 27 with brakes, which facilitates the transfer and fixation of the testing machine.

[0044] The specific usage process is as follows: Figure 7 As shown, workpiece 28 is first clamped. At this time, the positioning component is located at the rear end of the turntable, and the positioning component and the workpiece passage of the clamping component are collinear. Workpiece 28 is placed horizontally, and it extends into the clamping component from one end, passing between the first U-shaped pulley 6 and the second U-shaped pulley 9, and then through the positioning component to the outside. The position of workpiece 28 is adjusted according to the bending length requirement. After the position of workpiece 28 is adjusted, one end of workpiece 28 is clamped by the clamping component. Workpiece 28 is bent with the first U-shaped pulley 6 as the fulcrum. The rotary drive component 16 drives the turntable and the positioning component to rotate to the left. The controller 26 controls the rotation angle of the turntable by controlling the rotary drive component 16, thereby controlling the bending angle of workpiece 28. Then, workpiece 28 is folded back with the second U-shaped pulley 9 as the fulcrum. The position of the second U-shaped pulley 9 can be adjusted by the first linear drive component 4 first, and then the rotary drive component 16 drives the turntable and the positioning component to rotate to the right to complete the folding back of workpiece 28.

[0045] As can be seen, in this embodiment, the rotary drive component 16 can drive the turntable and the positioning components on the turntable to rotate. During bending, the first U-shaped pulley 6 serves as the fulcrum; during retraction, the second U-shaped pulley 9 serves as the fulcrum. This device can achieve bending and retraction of the workpiece 28. Simultaneously, the first U-shaped pulley 6 is rotatably mounted on the first bracket 5, and the second U-shaped pulley 9 is rotatably mounted on the second bracket 8. The first U-shaped pulley 6 and the second U-shaped pulley 9 can rotate simultaneously with the workpiece 28 during bending and retraction, avoiding significant relative friction with the workpiece 28 during bending and retraction, thus preventing damage to the surface of the workpiece 28. In this embodiment, controlling the movement of the rotary drive component 16 via the controller 26 enables control of the bending angle of the workpiece 28, improving experimental efficiency.

[0046] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bending fatigue performance testing machine, characterized in that, The system includes a frame, a support panel, a mounting base, a clamping assembly, a mounting base, a first bracket, a first U-shaped pulley, a first linear drive component, a second bracket, a second U-shaped pulley, a rotary drive component, a turntable, a positioning assembly, and a controller. The support panel is located on the upper part of the frame and has a through hole. The rotary drive component is located on the lower part of the support panel, with its upper end passing through the through hole and housing the turntable. The positioning assembly is located on the upper part of the turntable. The mounting base is located on the upper part of the support panel. The clamping assembly and the first linear drive component are sequentially arranged from front to back on the upper part of the mounting base. The clamping assembly is located on the front side of the turntable, and the first linear drive component is located on the right side of the turntable. A second bracket is provided near one end of the turntable, and a second U-shaped pulley is rotatably mounted on the second bracket. A mounting base is provided on the mounting frame and located between the turntable and the clamping assembly. A first bracket is provided near one end of the mounting base near the turntable, and a first U-shaped pulley is rotatably mounted on the first bracket. The axes of the first U-shaped pulley and the second U-shaped pulley are both vertically arranged. The clamping assembly is used to clamp one end of the workpiece. The other end of the workpiece can pass between the first U-shaped pulley and the second U-shaped pulley and protrude from the positioning assembly. The workpiece can slide relative to the positioning assembly. The rotation drive component is connected to the controller and is used to drive the turntable to rotate relative to the mounting frame under the action of the controller. The positioning assembly includes a base plate, a U-shaped bracket, a top plate, and rollers. The base plate is fixed to one side of the upper part of the turntable, and the two ends of the top plate are respectively fixed to the upper end of the U-shaped bracket. The two ends of each roller are respectively rotatably mounted on the top plate. The bending fatigue performance testing machine also includes a first distance sensor and a second distance sensor, which are mounted on the mounting base and are both connected to the controller.

2. The bending fatigue performance testing machine according to claim 1, characterized in that, The turntable includes a rotating plate and a sleeve fixed to one side of the lower part of the rotating plate. The sleeve is connected to the upper end of the rotary drive component.

3. The bending fatigue performance testing machine according to claim 2, characterized in that, It also includes a limiting plate and a locking bolt. The rotary drive component is connected to the sleeve key. The limiting plate is located on the upper part of the rotating plate. The locking bolt passes through the limiting plate and is threaded onto the power output shaft of the rotary drive component.

4. The bending fatigue performance testing machine according to claim 1, characterized in that, The clamping assembly includes a fixed clamping plate, a movable clamping plate, and a second linear drive component. The fixed clamping plate and the second linear drive component are respectively disposed on both sides of the upper front end of the mounting base. The movable clamping plate is disposed at one end of the second linear drive component near the fixed clamping plate. The movable clamping plate is driven by the linear drive component to move relative to the fixed clamping plate along the axial direction of the first linear drive component, so as to move closer to or away from the fixed clamping plate.

5. The bending fatigue performance testing machine according to claim 4, characterized in that, The axis of the first linear drive component is parallel to the axis of the second linear drive component. The first linear drive component is a first push-pull clamp, and the second linear drive component is a second push-pull clamp.

6. The bending fatigue performance testing machine according to claim 1, characterized in that, It also includes a first bearing, a second bearing, a first pin and / or a second pin, the first bracket and / or the second bracket are U-shaped structures, the first U-shaped pulley is mounted on the first bracket through the first bearing and the first pin and / or the second U-shaped pulley is mounted on the second bracket through the second bearing and the second pin.

7. The bending fatigue performance testing machine according to claim 1, characterized in that, The controller is mounted on the frame, the rotary drive component is a bipolar cycloidal pinwheel reducer motor, the first ranging sensor is a first photoelectric ranging sensor, and the second ranging sensor is a second photoelectric ranging sensor.

Images