A high-stress spring fatigue testing device

Abstract

This invention belongs to the technical field of spring testing equipment, specifically relating to a high-stress spring fatigue testing device, including a base and a gantry frame. The top of the base is provided with a worktable suitable for placing the spring. The gantry frame is located on top of the base, and a testing rod is provided on the side of the gantry frame facing the worktable. A lifting mechanism is provided between the testing rod and the gantry frame. The top of the worktable has two opposing movable plates, and a scrap bin is opened on the middle surface of the worktable. Both movable plates cover the top opening of the scrap bin. The purpose is to provide a sleeve for the spring to be fitted, and with the cooperation of the sleeve cavity inside the testing rod and the pressure ring at the opening, the top of the sleeve can be inserted into the sleeve cavity, ensuring the coaxiality of the testing rod and the sleeve, achieving precise alignment of the spring and the testing rod without manual alignment, simplifying the operation process, and avoiding test deviations caused by eccentric compression, thus improving the accuracy of the test results.

Description

Technical Field

[0001] This invention belongs to the technical field of spring testing equipment, and specifically relates to a high-stress spring fatigue testing device. Background Technology

[0002] Springs, as common mechanical parts, are widely used in various mechanical equipment for functions such as energy storage, buffering, vibration damping, force output, or force measurement. However, under long-term stress and repeated deformation, the spring material will suffer fatigue damage, leading to a decline in its performance and even breakage, thereby affecting the safety and reliability of the mechanical equipment.

[0003] Currently, when conducting fatigue tests on springs, it is usually necessary to fix the spring between the upper and lower clamps of the test device, and drive the upper clamp to repeatedly rise and fall through the drive mechanism, so that the spring is continuously compressed and stretched to simulate the actual working state.

[0004] However, during testing, there is a possibility that the spring may suddenly break. The broken spring fragments may fly in all directions, potentially damaging the testing apparatus itself and posing a serious threat to the personal safety of the operators. Simultaneously, the resulting metal shavings scattered on the worktable are difficult to clean, and long-term accumulation may affect the normal operation of the apparatus. Furthermore, traditional testing apparatuses often require manual alignment during spring installation to ensure the spring's axis coincides with the axis of the testing rod. This operation is cumbersome, and the alignment accuracy is difficult to guarantee, which affects the accuracy of the test results. Summary of the Invention

[0005] In view of this, the present invention provides a high-stress spring fatigue testing device, the purpose of which is to provide a high-stress spring fatigue testing device that can effectively prevent the splashing of fracture fragments during spring fatigue testing, facilitate the cleaning of metal debris, and enable auxiliary spring alignment, so as to solve the problems of safety hazards, inconvenient cleaning, and low alignment accuracy in the prior art.

[0006] The technical solution adopted in this invention is as follows: A high-stress spring fatigue testing device includes a base and a gantry frame. The top of the base is provided with a worktable suitable for placing springs. The gantry frame is located on the top of the base. A detection rod is provided on the side of the gantry frame facing the worktable. A lifting mechanism is provided between the detection rod and the gantry frame. The top of the worktable is provided with two opposing movable plates, and a scrap bin is opened on the middle surface of the worktable. Both movable plates cover the top opening of the scrap bin. The scrap bin is provided with a bottom rod inside. The top of the bottom rod is provided with a sleeve rod for the spring to be fitted. The inner diameter of the bottom rod is larger than the outer diameter of the sleeve rod. An arc-shaped opening is opened on the side of the two movable plates facing each other, and the arc-shaped opening is adapted to the bottom rod.

[0007] In some embodiments, each of the two movable plates is externally connected to a telescopic mechanism on the side away from each other, the telescopic mechanism being adapted to drive the movable plates to move towards or away from each other along the length of the worktable.

[0008] In some embodiments, the top of the movable plate is provided with an outer sleeve, which communicates with the arc-shaped opening. The outer sleeve is a semi-tube structure. When the two movable plates move toward each other and abut each other, the two outer sleeves combine to form a complete circular sleeve.

[0009] In some embodiments, a first guide groove is provided on the inner wall of both sides of the gantry frame, and a balance bar is provided on both sides of the lifting mechanism, the balance bar being slidably connected to the first guide groove.

[0010] In some embodiments, a partition is also included, which is located above the workbench. The partition has a through hole in the middle for the detection rod to pass through, and the two ends of the partition are respectively connected to the two sides of the gantry frame. The surface of the partition has a second guide groove, and the top of the outer sleeve has a slide rod inserted into the second guide groove.

[0011] In some embodiments, the top of the outer tube abuts against the bottom of the partition.

[0012] In some embodiments, the detection rod is a hollow structure with a sleeve cavity inside, the sleeve cavity being adapted to the sleeve rod, wherein a pressure ring is provided around the opening of the sleeve cavity.

[0013] In some embodiments, the surface of the workbench is further provided with a third guide groove, which is disposed opposite to both sides of the waste bin and is located below the moving plate.

[0014] In some embodiments, the bottom of the movable plate is provided with a slider adapted to the third guide groove.

[0015] In some embodiments, the bottom of the waste bin is provided with an inclined guide plate, the lower end of which extends to the outside of the base, and the surface of the guide plate is covered with a wear-resistant layer.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention, by setting a waste bin in the middle of the workbench, and cooperating with two movable plates that can move in opposite directions, allows the movable plates to be opened for easy operation when the spring is installed, and closed to seal the waste bin during testing. The metal shavings generated by the spring breaking can fall directly into the waste bin, avoiding the shavings from scattering on the workbench, greatly reducing the difficulty of cleaning, and preventing the long-term accumulation of shavings from affecting the normal operation of the device.

[0017] 2. The present invention provides a semi-tube outer sleeve on the top of the moving plate. When the two moving plates are closed, the outer sleeves combine to form a complete circular sleeve. This not only radially limits the spring to prevent lateral displacement and shaking during the spring test, ensuring test stability, but also forms a closed space when the spring breaks, effectively preventing fragments from flying in all directions, avoiding damage to the test device and threatening the personal safety of the operators, thus improving test safety.

[0018] 3. In this invention, the circular sleeve can pre-collect spring fragments. Since the circular sleeve is in close contact with the bottom rod, the spring fragments will accumulate on the top of the bottom rod. When the moving plates move away from each other, the circular sleeve is released from its closed state, so that the fragments accumulated inside it will fall smoothly into the waste bin due to the loss of lateral support, preventing the fragments from falling to other positions on the worktable.

[0019] 4. This invention, by setting a sleeve rod for the spring to be sleeved, and cooperating with the sleeve cavity inside the detection rod and the pressure ring at the opening, allows the top of the sleeve rod to be inserted into the sleeve cavity, ensuring the coaxiality of the detection rod and the sleeve rod, achieving precise alignment of the spring and the detection rod, eliminating the need for manual alignment, simplifying the operation process, and avoiding test deviations caused by eccentric compression, thus improving the accuracy of test results. Attached Figure Description

[0020] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the high-stress spring fatigue testing device provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the base provided by the present invention.

[0022] Figure 3 This is a schematic diagram of one side of the high-stress spring fatigue testing device provided by the present invention.

[0023] Figure 4 This invention provides Figure 1 Enlarged diagram of point A in the middle.

[0024] Figure 5 This is a schematic diagram of the structure of the movable plate and the outer sleeve provided by the present invention.

[0025] Figure 6 This is a schematic diagram of the detection rod provided by the present invention.

[0026] Figure 7 This is a schematic diagram showing the distribution of the outer sleeve and the sleeve rod provided by the present invention.

[0027] Figure 8 This is a schematic diagram showing the distribution of the movable plate and the base rod provided by the present invention.

[0028] 1. Base; 2. Gantry frame; 3. Partition plate; 4. Lifting mechanism; 5. Balance bar; 6. First guide groove; 7. Second guide groove; 8. Moving plate; 9. Third guide groove; 10. Outer sleeve; 11. Slide rod; 12. Telescopic mechanism; 13. Waste bin; 14. Bottom rod; 15. Sleeve rod; 16. Detection rod; 17. Slider; 18. Sleeve cavity; 19. Pressure ring. Detailed Implementation

[0029] 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. Example

[0030] In existing technologies, there is a possibility that the spring may suddenly break during testing. The broken spring fragments may fly in all directions, potentially damaging the testing device itself and posing a serious threat to the personal safety of the operators. Furthermore, the resulting metal shavings scattered on the worktable are difficult to clean, and long-term accumulation may affect the normal operation of the device. In addition, traditional testing devices often require manual alignment during spring installation to ensure that the spring's axis coincides with the axis of the testing rod 16. This operation is cumbersome, and the alignment accuracy is difficult to guarantee, which affects the accuracy of the test results.

[0031] Therefore, in order to solve the above problems and achieve the functions of effectively preventing the splashing of fractured fragments during spring fatigue testing, facilitating the cleaning of metal debris, and assisting in spring centering, this invention discloses a high-stress spring fatigue testing device. (See reference...) Figures 1-8 The system includes a base 1 and a gantry frame 2. The top of the base 1 is provided with a worktable suitable for placing springs. The gantry frame 2 is located on the top of the base 1. A detection rod 16 is provided on the side of the gantry frame 2 facing the worktable. A lifting mechanism 4 is provided between the detection rod 16 and the gantry frame 2. The top of the worktable is provided with two oppositely distributed movable plates 8, and a waste bin 13 is opened on the middle surface of the worktable. Both movable plates 8 cover the top opening of the waste bin 13. The waste bin 13 is provided with a bottom rod 14 inside. The top of the bottom rod 14 is provided with a sleeve rod 15 for the spring to be sleeved. The inner diameter of the bottom rod 14 is larger than the outer diameter of the sleeve rod 15. Both movable plates 8 have arc-shaped openings on the opposite sides, which are adapted to the bottom rod 14.

[0032] In this embodiment, the lifting mechanism 4 includes a transfer seat and a driving component. The transfer seat is located between the driving component and the detection rod 16. The driving component can be a cylinder, a hydraulic cylinder, or a servo motor combined with a ball screw structure. The output end of the driving component is connected to the transfer seat, and the detection rod 16 is installed at the bottom of the transfer seat. When conducting a spring fatigue test, the spring to be tested is placed on the sleeve rod 15, at which point the bottom of the spring abuts against the top of the bottom rod 14. Subsequently, the lifting mechanism 4 drives the detection rod 16 to move downward, so that the bottom of the detection rod 16 contacts the top of the spring and applies pressure. Then, the reciprocating motion of the lifting mechanism 4 drives the detection rod 16 to move up and down, thereby realizing repeated compression and stretching of the spring, simulating the stress situation under its actual working condition.

[0033] The detection rod 16 is a hollow structure with a sleeve cavity 18 inside. The sleeve cavity 18 is adapted to the sleeve rod 15. A pressure ring 19 is provided around the opening of the sleeve cavity 18. When the detection rod 16 moves downward, the top of the sleeve rod 15 can be inserted into the sleeve cavity 18, further ensuring the coaxiality of the detection rod 16 and the sleeve rod 15. This ensures that the spring always deforms axially during the stress process, avoiding deviations in test results due to eccentric compression. On the other hand, the pressure ring 19 can abut against the top of the spring, increasing the contact area between the detection rod 16 and the spring, making the spring more evenly stressed and reducing stress concentration. The two moving plates 8 are externally connected to telescopic mechanisms 12 on opposite sides. The telescopic mechanisms 12 are suitable for driving the moving plates 8 to move towards or away from each other along the length of the worktable. The telescopic mechanisms 12 can be electric push rods or cylinders. When installing the spring, the telescopic mechanism 12 drives the two moving plates 8 to move in opposite directions, so that the arc-shaped opening is separated from the bottom rod 14. At this time, the operator can put the spring on the sleeve rod 15. After the spring is installed, the telescopic mechanism 12 drives the two moving plates 8 to move towards each other until the two moving plates 8 touch each other. At this time, the arc-shaped opening is tightly fitted with the outer wall of the bottom rod 14, wrapping the bottom rod 14.

[0034] Furthermore, the top of the movable plate 8 is provided with an outer sleeve 10, which communicates with the arc-shaped opening. The outer sleeve 10 is a semi-tubular structure; when the two movable plates 8 move towards each other and abut, the two outer sleeves 10 combine to form a complete circular sleeve. The inner diameter of this circular sleeve is larger than the outer diameter of the spring. When the spring is fitted onto the sleeve rod 15, the combined circular sleeve can radially limit the spring from the outside, preventing lateral displacement or wobbling during the test, further improving the stability and accuracy of the test. Simultaneously, in the event of spring breakage, the outer sleeve 10 and the movable plate 8 can form a relatively enclosed space, effectively preventing fragments from flying in all directions, thus providing safety protection.

[0035] Furthermore, after the testing process is completed, the movable plate 8 can move in opposite directions under the drive of the telescopic mechanism 12. At this time, the waste bin 13 located at the bottom of the movable plate 8 will be opened. If the tested spring breaks, the resulting debris can fall directly into the waste bin 13, preventing it from scattering on the worktable. For unbroken springs, the operator can remove them from the sleeve rod 15. This design eliminates the need for workers to clean the debris on the worktable separately after each testing process, significantly reducing the difficulty and workload of cleaning.

[0036] It should be noted that when the two movable plates 8 are in contact with each other and closed, the top opening of the waste bin 13 will be closed by the two movable plates 8. When the two movable plates 8 are far apart, the top opening of the waste bin 13 will open, allowing the spring debris inside the circular sleeve to fall naturally into the waste bin 13.

[0037] Optionally, the waste bin 13 is equipped with an inclined guide plate at its bottom. The lower end of the guide plate extends to the outside of the base 1, and the surface of the guide plate is covered with a wear-resistant layer. When debris generated by the spring break falls into the waste bin 13, it will land on the guide plate. Due to the inclined design of the guide plate, the debris will slide down along the inclined direction of the guide plate under its own gravity and eventually be discharged from the lower end of the guide plate to the outside of the base 1. This facilitates the centralized collection and processing of debris by operators and prevents debris from accumulating in the waste bin 13. The wear-resistant layer covering the surface of the guide plate can effectively reduce the wear on the surface of the guide plate during the debris sliding process, extend the service life of the guide plate, and ensure its long-term stable guiding function. Example

[0038] Based on Embodiment 1, in order to improve the stability of the equipment during operation, a first guide groove 6, a second guide groove 7, and a third guide groove 9 are also included. Specifically, the first guide groove 6 is provided on the inner walls of both sides of the gantry frame 2, and the balance rods 5 are provided on both sides of the transfer seat. The balance rods 5 are slidably connected to the first guide groove 6. A partition plate 3 is also included. The partition plate 3 is located above the workbench. A through hole for the detection rod 16 to pass through is provided in the middle of the partition plate 3, and the two ends of the partition plate 3 are respectively connected to the two sides of the gantry frame 2. The second guide groove 7 is provided on the surface of the partition plate 3, and a sliding rod 11 inserted into the second guide groove 7 is provided at the top of the outer sleeve 10. The third guide groove 9 is also provided on the surface of the workbench. The third guide groove 9 is arranged opposite to the two sides of the waste bin 13 and is located below the moving plate 8. A slider 17 adapted to the third guide groove 9 is provided at the bottom of the moving plate 8.

[0039] In this embodiment, when the lifting mechanism 4 drives the detection rod 16 to move up and down, the balance bars 5 on both sides of the transfer seat will slide synchronously along the first guide groove 6 on the inner wall of the gantry 2. This setting can effectively limit the movement trajectory of the transfer seat and prevent it from swaying or deviating during movement, thereby ensuring that the detection rod 16 can always remain vertically raised and lowered, further ensuring the uniformity of the pressure applied to the spring and the reliability of the test results. At the same time, the cooperation between the balance bars 5 and the first guide groove 6 can also disperse the lateral force borne by the lifting mechanism 4, improving the structural stability and service life of the entire device.

[0040] Furthermore, the partition 3 provides guidance and support for the movement of the outer sleeve 10. When the moving plate 8 moves along the length of the worktable under the drive of the telescopic mechanism 12, the slide rod 11 at the top of the outer sleeve 10 slides along the second guide groove 7 on the surface of the partition 3. This makes the movement of the outer sleeve 10 more stable, preventing the outer sleeve 10 from shifting due to the shaking of the moving plate 8, and ensuring that the two semi-tube outer sleeves 10 can be joined to form a complete circular sleeve. On the other hand, the partition 3 can also play a certain role in blocking the spring when it breaks, preventing the flying fragments from bouncing upwards, further improving the safety protection performance of the device.

[0041] In addition, the third guide groove 9 on the surface of the workbench cooperates with the slider 17 at the bottom of the moving plate 8 to provide guidance for the movement of the moving plate 8, ensuring that the two moving plates 8 can move smoothly towards or away from each other, and can accurately abut when closed, ensuring that the arc-shaped opening fits tightly with the bottom rod 14, and that the outer sleeve 10 is accurately connected.

[0042] In summary, based on Examples 1 and 2, the working steps of this high-stress spring fatigue testing device are as follows: First, activate the telescopic mechanism 12 to drive the two moving plates 8 to move in opposite directions along the third guide groove 9 on the surface of the workbench, so that the arc-shaped opening on the moving plate 8 separates from the bottom rod 14 in the waste bin 13. At the same time, the outer sleeve 10 on the top of the moving plate 8 moves synchronously with the moving plate 8, and the sliding rod 11 on the top of the outer sleeve 10 slides along the second guide groove 7 on the surface of the partition 3 until the top opening of the waste bin 13 is fully opened. The operator then places the spring to be tested on the sleeve rod 15 on the top of the bottom rod 14, ensuring that the bottom of the spring is in close contact with the top of the bottom rod 14, thus completing the initial placement of the spring.

[0043] Next, the telescopic mechanism 12 is activated again, driving the two moving plates 8 to move towards each other. The slider 17 at the bottom of the moving plates 8 slides smoothly along the third guide groove 9 until the two moving plates 8 abut against each other. At this time, the arc-shaped opening is tightly fitted with the outer wall of the bottom rod 14, and the two semi-tube outer sleeves 10 are joined to form a complete circular sleeve, which radially limits the spring. Then, the lifting mechanism 4 is activated, and the driving component drives the transfer seat to move downward. The balance bars 5 on both sides of the transfer seat slide synchronously along the first guide groove 6 on the inner wall of the gantry frame 2 to ensure that the transfer seat is lifted vertically, thereby driving the detection rod 16 to move downward, so that the sleeve... The top of rod 15 is inserted into the sleeve cavity 18 inside the detection rod 16. The pressure ring 19 at the opening of the detection rod 16 abuts against the top of the spring, completing the alignment of the spring and the detection rod 16. Then, the lifting mechanism 4 drives the detection rod 16 to reciprocate up and down, repeatedly compressing and stretching the spring to simulate its actual working stress state and carry out fatigue test. During the test, if the spring breaks, the outer sleeve 10, the moving plate 8 and the partition 3 form a protective space to prevent fragments from flying. The broken fragments fall onto the closed moving plate 8. At the same time, the operating status of the device is observed in real time to ensure that all components work normally.

[0044] Finally, after the test is completed, stop the lifting mechanism 4 and the telescopic mechanism 12. First, start the telescopic mechanism 12 to drive the two moving plates 8 to move in opposite directions, open the top opening of the waste bin 13. If the spring has broken, its debris will fall naturally into the waste bin 13, slide down along the inclined guide plate at the bottom and be discharged from the outside of the base 1. The operator will collect and process the debris. If the spring has not broken, the operator will remove the spring from the sleeve rod 15. After the test is completed, perform a simple inspection of the device to confirm that there are no abnormalities in each component and no debris residue. Turn off all driving components, organize the test tools and test samples, and complete the entire spring fatigue test process.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high stress spring fatigue testing device, comprising a base (1) and a gantry (2), the top of the base (1) is provided with a workbench suitable for placing a spring, the gantry (2) is arranged on the top of the base (1), and the side of the gantry (2) facing the workbench is provided with a detection rod (16), and a lifting mechanism (4) is arranged between the detection rod (16) and the gantry (2), characterized in that, The top of the workbench is provided with two oppositely distributed movable plates (8), and a waste bin (13) is opened on the middle surface of the workbench. Both movable plates (8) cover the top opening of the waste bin (13). The waste bin (13) is provided with a bottom rod (14) inside. The top of the bottom rod (14) is provided with a sleeve rod (15) for spring sleeve. The inner diameter of the bottom rod (14) is larger than the outer diameter of the sleeve rod (15). Both movable plates (8) have arc-shaped openings on their opposite sides, which are adapted to the bottom rod (14).

2. The high stress spring fatigue testing apparatus of claim 1, wherein, Both of the two movable plates (8) are externally connected to telescopic mechanisms (12) on the side away from each other. The telescopic mechanisms (12) are adapted to drive the movable plates (8) to move towards or away from each other along the length of the worktable.

3. The high-stress spring fatigue testing device according to claim 2, characterized in that, The top of the movable plate (8) is provided with an outer sleeve (10), which is connected to the arc-shaped opening. The outer sleeve (10) is a semi-tube structure. When the two movable plates (8) move towards each other and collide, the two outer sleeves (10) combine to form a complete circular sleeve.

4. The high-stress spring fatigue testing device according to claim 1, characterized in that, The inner walls on both sides of the gantry (2) are provided with first guide grooves (6), and the lifting mechanism (4) is provided with balance bars (5) on both sides. The balance bars (5) are slidably connected to the first guide grooves (6).

5. The high-stress spring fatigue testing device according to claim 4, characterized in that, It also includes a partition (3), which is located above the workbench. The partition (3) has a through hole in the middle for the detection rod (16) to pass through, and the two ends of the partition (3) are respectively connected to the two sides of the gantry (2). The surface of the partition (3) has a second guide groove (7), and the top of the outer tube (10) has a slide rod (11) inserted into the second guide groove (7).

6. The high-stress spring fatigue testing apparatus according to any one of claims 3 or 5, characterized in that, The top of the outer tube (10) abuts against the bottom of the partition (3).

7. The high-stress spring fatigue testing device according to claim 1, characterized in that, The detection rod (16) is a hollow structure with a sleeve cavity (18) inside. The sleeve cavity (18) is adapted to the sleeve rod (15). A pressure ring (19) is provided around the opening of the sleeve cavity (18).

8. The high-stress spring fatigue testing device according to claim 1, characterized in that, The surface of the workbench is also provided with a third guide groove (9), which is arranged opposite to the two sides of the waste bin (13) and is located below the moving plate (8).

9. The high-stress spring fatigue testing device according to claim 8, characterized in that, The bottom of the movable plate (8) is provided with a slider (17) adapted to the third guide groove (9).

10. The high-stress spring fatigue testing device according to claim 1, characterized in that, The bottom of the waste bin (13) is provided with an inclined guide plate, the lower end of which extends to the outside of the base (1), and the surface of the guide plate is covered with a wear-resistant layer.

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