A spring compression fatigue testing device

Abstract

The utility model belongs to fatigue testing arrangement technical field especially is a kind of spring compression fatigue testing device, including platform, the bottom four corners of platform are fixedly installed with foot cup, the top of platform is fixedly connected with motor frame, servo motor is installed on the motor frame, the output of servo motor is fixedly connected with eccentric block, and pull rod is rotatably connected at the eccentricity of eccentric block.The utility model, with servo motor-eccentric block-pull rod constitutes simplified power mechanism, replaces complex hydraulic system / pneumatic system, reduces equipment cost and volume, adapts small and medium-sized enterprise demand;The orientation cooperation of sliding sleeve and slide rod, in combination with the accurate control of servo motor, guarantee reciprocating movement of moving plate stable, improve test data repeatability;The cooperation of hand wheel screw rod and screw hole can flexibly adjust spring pre-tightness and positioning, adapt multi-specification spring, and double sets of perforation and screw hole design support synchronous test, significantly improve detection efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of fatigue testing devices, specifically a spring compression fatigue testing device. Background Technology

[0002] In industries such as automotive, machinery, and electronics, which rely on spring components, the compressive fatigue performance of springs, as core elastic elements, directly determines the service life and operational safety of the entire equipment. Whether it's the shock absorber springs in automotive suspension systems or the return springs in industrial machinery, prolonged exposure to repeated compression conditions can easily lead to elastic decay, deformation, or even breakage due to metal fatigue, ultimately causing equipment failure. Therefore, accurate compressive fatigue testing of springs is a crucial step in ensuring product quality and mitigating safety risks, and it is also a necessary pre-mass production testing procedure in the industry.

[0003] Current spring compression fatigue testing devices on the market suffer from two typical problems: One type of device has a complex structure, often relying on hydraulic or pneumatic drive systems. These devices are not only large and expensive, but also require professional operation and maintenance, making them unsuitable for the batch testing needs of small and medium-sized enterprises. The other type of simple device, while cheaper, suffers from poor power transmission stability. Insufficient precision in the linkage between the motor and actuators often leads to large fluctuations in spring compression frequency and stroke, resulting in low repeatability of test data and failing to meet high-precision testing standards. Furthermore, some devices lack flexible spring positioning and pre-tensioning structures. When dealing with springs of different specifications (length, diameter), the adjustment process is cumbersome, testing efficiency is low, and it is difficult to be compatible with testing scenarios involving multiple types of springs.

[0004] With the increasing demands on spring performance and the dual considerations of production efficiency and testing costs, the industry urgently needs a compression fatigue testing device that is structurally simple, cost-controllable, accurate in testing, and compatible with multiple spring specifications. Summary of the Invention

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a spring compression fatigue testing device, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, this utility model specifically adopts the following technical solution: A spring compression fatigue testing device includes a platform with foot cups fixedly installed at the four corners of the bottom of the platform. A motor frame is fixedly connected to the top of the platform, and a servo motor is installed on the motor frame. An eccentric block is fixedly connected to the output end of the servo motor. A pull rod is rotatably connected to the eccentric part of the eccentric block. A movable plate is rotatably connected to the other end of the pull rod. Sliding sleeves are fixedly connected to both sides of the movable plate and are slidably connected to a sliding rod. A pad is bolted to the movable plate, and through holes are opened at corresponding positions on the pad and the movable plate. A base plate is also fixedly connected to the platform, and a threaded hole is opened on the base plate. A handwheel screw is inserted into the threaded hole and the through hole.

[0007] Furthermore, the slide bar is fixed by fixing blocks at both ends, and the fixing blocks are fixedly connected to the platform.

[0008] Furthermore, the perforations are symmetrically arranged in two locations.

[0009] Furthermore, there are two threaded holes, corresponding to the through holes.

[0010] Furthermore, the handwheel screw is provided with a thread, which is threaded to a threaded hole.

[0011] Furthermore, the handwheel screw is sleeved inside the spring, and the handwheel screw passes through the hole.

[0012] Furthermore, the upper and lower ends of the spring are respectively movable between the base plate and the pad.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a spring compression fatigue testing device, which has the following beneficial effects: This invention uses a simplified power mechanism consisting of a servo motor, an eccentric block, and a pull rod to replace a complex hydraulic / pneumatic system, reducing equipment cost and size, and meeting the needs of small and medium-sized enterprises. The guiding cooperation between the sliding sleeve and the sliding rod, combined with the precise control of the servo motor, ensures stable reciprocating motion of the moving plate and improves the repeatability of test data. The cooperation between the handwheel screw and the threaded hole allows for flexible adjustment of spring preload and positioning, adapting to multiple spring specifications. Furthermore, the dual-set through-hole and threaded hole design supports simultaneous testing, significantly improving testing efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is another three-dimensional structural schematic diagram of the present utility model.

[0015] In the diagram: 1. Platform; 2. Foot cup; 3. Motor frame; 4. Servo motor; 5. Eccentric block; 6. Tie rod; 7. Moving plate; 8. Sliding sleeve; 9. Sliding rod; 10. Pad block; 11. Perforation; 12. Base plate; 13. Threaded hole; 14. Handwheel screw. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example like Figure 1-3 As shown in the figure, an embodiment of the present invention provides a spring compression fatigue testing device, including a platform 1. Foot cups 2 are fixedly installed at the four corners of the bottom of the platform 1, and a motor frame 3 is fixedly connected to the top of the platform 1. The foot cups 2 provide stable support for the platform 1, and the platform 1 can be adjusted to ensure it is level and prevent tilting. The platform 1 serves as the basic load-bearing structure, integrating key components such as the motor frame 3, base plate 12, and sliding rod 9 fixing block into one unit. This ensures the relative positions of each component are fixed, maintains precise coordination of the power transmission, spring positioning, and other linkage structures, guarantees the overall stability of the entire device during operation, and reduces the interference of vibration on the test data. A servo motor 4 is mounted on the motor frame 3. An eccentric block 5 is fixedly connected to the output end of the servo motor 4. A pull rod 6 is rotatably connected to the eccentric part of the eccentric block 5. A moving plate 7 is rotatably connected to the other end of the pull rod 6. Sliding sleeves 8 are fixedly connected to both sides of the moving plate 7. The sliding sleeves 8 are slidably connected to the sliding rod 9. After the servo motor 4 is started, it drives the eccentric block 5 to rotate. The eccentric motion of the eccentric block 5 is converted into the linear motion of the moving plate 7 through the pull rod 6. The sliding cooperation between the sliding sleeves 8 and the sliding rod 9 provides guidance for the moving plate 7, ensuring that the moving plate 7 makes stable up-and-down reciprocating motion along a fixed trajectory, providing continuous and regular power for spring compression, and ensuring the stability and accuracy of fatigue testing. A pad 10 is bolted onto the movable plate 7. A through hole 11 is formed at the corresponding position of the pad 10 and the movable plate 7. A base plate 12 is also fixedly connected to the platform 1. A threaded hole 13 is formed on the base plate 12. A handwheel screw 14 is inserted into the threaded hole 13 and the through hole 11. When the handwheel screw 14 is rotated, it moves axially through the threaded engagement with the threaded hole 13, adjusting the initial height of the spring between the base plate 12 and the pad 10, thus positioning the spring. Simultaneously, the axial adjustment of the handwheel screw 14 applies an initial preload to the spring, ensuring that the spring remains within the effective testing range during the test, preventing spring displacement from affecting the test results. Furthermore, the corresponding design of the through hole 11 and the threaded hole 13 ensures the coaxiality of the handwheel screw 14 during installation and adjustment.

[0018] The working principle of the spring compression fatigue testing device is as follows: First, the spring to be tested is placed on the outside of the handwheel screw 14, so that the upper and lower ends of the spring correspond to the base plate 12 and the pad 10 respectively. Then, the position of the handwheel screw 14 in the through hole 11 is adjusted by the threaded engagement between the handwheel screw 14 and the threaded hole 13 on the base plate 12, thereby initially positioning and pre-tightening the spring. The servo motor 4 on the motor frame 3 is started. The output end of the servo motor 4 drives the eccentric block 5 to rotate. The eccentric rotation of the eccentric block 5 is transmitted to the moving plate 7 through the pull rod 6. Since the sliding sleeves 8 on both sides of the moving plate 7 are slidably connected to the sliding rod 9, and the sliding rod 9 is fixed to the platform 1 by the fixing block, the moving plate 7 will move up and down reciprocally under the guidance of the sliding rod 9, thereby driving the pad 10 to repeatedly compress the spring, realizing the compression fatigue test of the spring. The foot cup 2 at the bottom of the platform 1 plays the role of support and stabilization device.

[0019] like Figure 2 As shown, in some embodiments, the slide bar 9 is fixed by fixing blocks at both ends, and the fixing blocks are fixedly connected to the platform 1; the connection design provides a rigid guiding foundation for the movement of the slide sleeve 8 and the moving plate 7.

[0020] like Figure 3 As shown, in some embodiments, the perforations 11 are symmetrically arranged in two locations.

[0021] like Figure 3 As shown, in some embodiments, there are two threaded holes 13, corresponding to the through holes 11; Two groups can be set up simultaneously for synchronous testing.

[0022] like Figure 3 As shown, in some embodiments, the handwheel screw 14 is provided with a thread, which is threaded to the threaded hole 13; like Figure 3 As shown, in some embodiments, the handwheel screw 14 is sleeved inside the spring, and the handwheel screw 14 passes through the through hole 11; The handwheel screw 14 has only one thread. The unthreaded part can slide freely in the through hole 11. When the servo motor 4 drives the moving plate 7 to move up and down, the through hole 11 will move along the smooth section of the handwheel screw 14. This will not affect the normal movement of the moving plate 7, but will also help the moving plate 7 maintain a stable movement trajectory through the guiding effect of the screw, thereby indirectly improving the regularity of the spring compression action.

[0023] like Figure 3 As shown, in some embodiments, the upper and lower ends of the spring are respectively movable between the base plate 12 and the pad 10; the movable cooperation between the upper and lower ends of the spring allows the spring to deform freely during compression, while the fixedness of the base plate 12 and the following motion of the pad 10 limit the radial displacement of the spring, thus preventing the spring from tilting or misaligning during reciprocating compression.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spring compression fatigue testing device, comprising a platform (1), characterized in that: Foot cups (2) are fixedly installed at the four corners of the bottom of the platform (1). A motor frame (3) is fixedly connected to the top of the platform (1). A servo motor (4) is installed on the motor frame (3). An eccentric block (5) is fixedly connected to the output end of the servo motor (4). A pull rod (6) is rotatably connected to the eccentric part of the eccentric block (5). A moving plate (7) is rotatably connected to the other end of the pull rod (6). Sliding sleeves (8) are fixedly connected to both sides of the moving plate (7). The sliding sleeves (8) are slidably connected to the sliding rod (9). A pad (10) is bolted on the moving plate (7). A through hole (11) is opened at the corresponding position of the pad (10) and the moving plate (7). A base plate (12) is also fixedly connected to the platform (1). A threaded hole (13) is opened on the base plate (12). A handwheel screw (14) is inserted into the threaded hole (13) and the through hole (11).

2. The spring compression fatigue testing device according to claim 1, characterized in that: The slide bar (9) is fixed by fixing blocks at both ends, and the fixing blocks are fixedly connected to the platform (1).

3. The spring compression fatigue testing device according to claim 1, characterized in that: The perforation (11) is symmetrically arranged in two places.

4. The spring compression fatigue testing device according to claim 1, characterized in that: There are two threaded holes (13), which correspond to the through holes (11).

5. The spring compression fatigue testing device according to claim 1, characterized in that: The handwheel screw (14) is provided with a thread, which is threaded to the threaded hole (13).

6. The spring compression fatigue testing device according to claim 1, characterized in that: The handwheel screw (14) is sleeved inside the spring, and the handwheel screw (14) passes through the through hole (11).

7. The spring compression fatigue testing device according to claim 6, characterized in that: The upper and lower ends of the spring are respectively movable between the base plate (12) and the pad (10).

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