Spring fatigue life testing machine

Abstract

The utility model discloses a spring fatigue life testing machine, and relates to the technical field of spring life testing. The two sets of clamps are installed in the machine body and used for clamping the two ends of the spring, the power driving mechanism is installed in the machine body and used for repeatedly pulling and pressing the clamped spring, the detection processing mechanism is installed in the machine body, and a fixing plate is fixedly arranged at the top of the inner side of the machine body. According to the utility model, through the combination of the permanent magnet synchronous motor and the ball screw, the spring is repeatedly pulled and pressed at different degrees, the pulling and pressing condition of the spring under the actual working condition is simulated, the test precision and credibility are greatly improved, and the comprehensive detection of the fatigue characteristics of the spring after repeated pulling and pressing can be realized in cooperation with the detection processing mechanism. And during testing, the protective door is closed, so that fragments generated after the spring is broken can be prevented from splashing out of the testing machine and hurting surrounding people, and the safety of the testing machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spring life testing, in particular to a spring fatigue life testing machine. Background Art

[0002] A spring is a mechanical part that uses elasticity to work. Parts made of elastic material deform under external force and return to their original shape when the external force is removed.

[0003] With the continuous development of the machinery manufacturing industry, increasingly stringent requirements are being placed on springs, a fundamental and crucial component. This is particularly true in the automotive and aerospace industries. To ensure the safety and comfort of vehicle operation, or the safety and stability of aircraft flight, springs are required not only to have strong load-bearing capacity but also to exhibit stability over extended service life. Therefore, efficiently and accurately assessing the fatigue life of springs has become a pressing issue.

[0004] Traditional spring fatigue life testing machines mainly include mechanical loading systems, among which the mechanical loading system uses gears, chains, etc. to achieve periodic load changes on the spring. The advantages are simple structure and low cost, but the disadvantages are also obvious. For example, it is difficult to simulate the dynamic stress state under actual working conditions, resulting in the test results not being true and reliable. Utility Model Content

[0005] The utility model provides a spring fatigue life testing machine to address the shortcomings of traditional spring fatigue life testing machines, which mainly use gears, chains, etc. to achieve periodic load changes on the spring, making it difficult to simulate the dynamic stress state under actual working conditions, resulting in unreliable test results. The specific technical solution is as follows:

[0006] A spring fatigue life testing machine comprises a machine body, a spring, two sets of clamps installed in the machine body and used to clamp the two ends of the spring, a power drive mechanism installed in the machine body and used to repeatedly pull and press the clamped spring, and a side inspection and processing mechanism installed in the machine body, wherein a fixed plate is fixedly provided on the top inner side of the machine body, the power drive mechanism comprises a permanent magnet synchronous motor fixedly provided on the top of the fixed plate, a ball screw fixedly provided on the bottom of the output end of the permanent magnet synchronous motor, and a U-shaped frame fixedly provided on the outside of the ball screw nut, the clamp at the top end of the spring is detachably provided on the bottom of the U-shaped frame, the clamp at the bottom end of the spring is detachably provided on the inner bottom of the machine body, and a limit rod is fixedly provided on the top of the U-shaped frame, the top end of which passes through and extends to the outside of the fixed plate;

[0007] The detection and processing mechanism includes a number of displacement sensors fixedly installed on the outside of the two groups of clamps and used to monitor the spring deformation in real time, a microprocessor fixedly installed in the body and used to process the detection information of the displacement sensors, and a visual operation display screen fixedly installed on the outer wall of the body and used to display the information processed by the microprocessor and provide user operation.

[0008] By adopting the above technical solution, the spring is repeatedly stretched and compressed to different degrees through the combination of a permanent magnet synchronous motor and a ball screw to simulate the tension and compression conditions of the spring under actual working conditions, which greatly improves the test accuracy and reliability. In addition, in conjunction with the inspection and processing mechanism, it can realize comprehensive testing of the fatigue characteristics of the spring after repeated tension and compression, thereby improving work efficiency.

[0009] Optionally, the clamp includes a clamping frame, a bidirectional screw rotatably arranged in the clamping frame, and a clamping plate with threads arranged on the outer walls of both ends of the bidirectional screw. The top end of the clamping plate is slidably arranged in a corresponding clamping frame. Notches are provided on both sides of the clamping frame for the clamping plate to slide and pass through. A trapezoidal groove is provided on one side of the clamping plate. One end of the spring is clamped in the trapezoidal grooves of two adjacent clamping plates. Several rubber protrusions are fixed in the trapezoidal grooves of the clamping plates to prevent the spring from slipping.

[0010] By adopting the above technical solution, by rotating the bidirectional screw rod, the two adjacent clamping plates can be driven to move closer to or away from each other, so that the two clamping plates can quickly clamp one end of the spring through the trapezoidal groove after movement, making it convenient for the spring to be quickly disassembled and assembled.

[0011] Optionally, a crank located outside the clamping frame is fixedly provided at one end of the bidirectional screw rod, and a rotating plate is fixedly provided at one end of the bidirectional screw rod away from the crank handle, and the rotating plate is rotatably connected in the clamping frame.

[0012] By adopting the above technical solution, the rotating plate can connect the bidirectional screw rod and the clamping frame, so that the bidirectional screw rod can rotate on the clamping frame without falling off. When the staff shakes the handle, the bidirectional screw rod will be driven to rotate.

[0013] Optionally, a protective door is rotatably provided on one side of the machine body, and an observation window is fixedly provided inside the protective door.

[0014] By adopting the above technical solution, closing the protective door during the test can prevent fragments of the broken spring from flying out of the testing machine and injuring people around, thereby improving the safety of the testing machine.

[0015] In summary, the present invention has at least one of the following beneficial effects:

[0016] 1. Through the combination of a permanent magnet synchronous motor and a ball screw, the spring is repeatedly stretched and compressed to varying degrees to simulate the tension and compression of the spring under actual working conditions, which greatly improves the test accuracy and reliability. In combination with the inspection and processing mechanism, it can achieve a comprehensive test of the fatigue characteristics of the spring after repeated tension and compression, thereby improving work efficiency. Closing the protective door during the test can prevent fragments of the spring from flying out of the testing machine after breaking and injuring people around, thereby improving the safety of the testing machine.

[0017] 2. By shaking the handle and coordinating with the rotation of the bidirectional screw, the two adjacent clamping plates can be driven to move closer or farther away from each other, so that the two clamping plates can quickly clamp one end of the spring through the trapezoidal groove after movement, which facilitates the rapid disassembly and assembly of the spring. Moreover, through the guidance and limit of the inclined surface inside the trapezoidal groove, the two clamping plates can clamp springs of different sizes after movement, which has a wide range of applications. The several rubber protrusions in the trapezoidal groove can prevent the clamped spring from slipping, thereby improving the stability of the clamping, and is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a front cross-sectional view of the overall structure of the utility model;

[0020] Figure 3 This utility model Figure 2 A magnified view of the structure in the middle;

[0021] Figure 4 This utility model Figure 3 A magnified view of the structure in middle B.

[0022] Explanation of the accompanying reference numerals: 1. Machine body; 11. Protective door; 2. Clamping frame; 21. Bidirectional screw; 22. Clamping plate; 23. Trapezoidal groove; 24. Rubber protrusion; 25. Crank handle; 26. Turn plate; 3. Fixed plate; 31. Permanent magnet synchronous motor; 32. Ball screw; 33. U-shaped frame; 34. Limit rod; 4. Displacement sensor; 41. Microprocessor; 42. Visual operation display screen. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-4 The utility model is described in further detail.

[0024] The utility model discloses a spring fatigue life testing machine, referring to Figure 1-3, including a body 1, a spring, two sets of clamps, a power drive mechanism and a detection and processing mechanism. The body 1 can detect the fatigue life of the spring through components such as the power drive mechanism. The two sets of clamps are installed in the body 1, and the two sets of clamps can clamp both ends of the spring for subsequent fatigue life testing.

[0025] Reference Figure 2-3 The clamp includes a clamping frame 2, a bidirectional screw rod 21 rotatably arranged in the clamping frame 2, and a clamping plate 22 with threads arranged on the outer walls of both ends of the bidirectional screw rod 21. The top end of the clamping plate 22 is slidably arranged in the corresponding clamping frame 2. Notches are opened on both sides of the clamping frame 2 for the clamping plate 22 to slide and pass through. The threads at both ends of the bidirectional screw rod 21 are in opposite directions. The clamping frame 2 can limit the clamping plate 22 so that the clamping plate 22 can only move horizontally. The notch of the clamping frame 2 can facilitate the movement of the clamping plate 22 on the clamping frame 2.

[0026] Reference Figure 2-3 A trapezoidal groove 23 is provided on one side of the clamping plate 22, and one end of the spring is clamped in the trapezoidal grooves 23 of the two adjacent clamping plates 22. After the bidirectional screw rod 21 rotates, it cooperates with the limit of the clamping frame 2 to drive the two adjacent clamping plates 22 to move closer or farther away from each other, so that the two clamping plates 22 after movement can quickly clamp one end of the spring through the trapezoidal groove 23, which is convenient for quick disassembly and assembly of the spring. When clamping, the top end of the spring will enter the trapezoidal groove 23 of the clamping plate 22, and through the guidance and limitation of the inner inclined surface of the trapezoidal groove 23, the two clamping plates 22 after movement can clamp springs of different sizes and specifications, and have a wide range of applications.

[0027] Reference Figure 2-4 A plurality of rubber protrusions 24 for preventing the spring from slipping are fixed in the trapezoidal groove 23 of the clamping plate 22. The plurality of rubber protrusions 24 in the trapezoidal groove 23 can prevent the clamped spring from slipping, thereby improving the stability of the clamp clamping one end of the spring.

[0028] Reference Figure 2-3 One end of the bidirectional screw rod 21 is fixed with a crank handle 25 located outside the clamping frame 2, and the end of the bidirectional screw rod 21 away from the crank handle 25 is fixed with a rotating plate 26. The rotating plate 26 is rotatably connected to the clamping frame 2. The rotating plate 26 can be a circular plate shape. The rotating plate 26 can connect the bidirectional screw rod 21 and the clamping frame 2, so that the bidirectional screw rod 21 can rotate on the clamping frame 2 without falling off. When the staff shakes the crank handle 25, the bidirectional screw rod 21 will be driven to rotate.

[0029] Reference Figure 2-3A fixing plate 3 is fixed on the top inner side of the body 1. The power drive mechanism includes a permanent magnet synchronous motor 31 fixed on the top of the fixing plate 3, a ball screw 32 fixed on the bottom of the output end of the permanent magnet synchronous motor 31, and a U-shaped frame 33 fixed on the outside of the nut of the ball screw 32. The fixing plate 3 can connect the body 1 and the permanent magnet synchronous motor 31, and the fixing plate 3 can support and fix the permanent magnet synchronous motor 31. The ball screw 32 includes a screw and a nut, wherein the screw of the ball screw 32 is fixedly connected to the output end of the permanent magnet synchronous motor 31, and the U-shaped frame 33 is fixed on the outside of the nut of the ball screw 32. The ball screw 32 is a public technology and will not be described in detail here.

[0030] Reference Figure 2-3 The clamp at the top of the spring can be detachably mounted on the bottom of the U-shaped frame 33, and the clamp at the bottom of the spring can be detachably mounted on the inner bottom of the body 1. A limit rod 34 is fixed on the top of the U-shaped frame 33, the top of which passes through and extends to the outside of the fixed plate 3. The limit rod 34 can limit the U-shaped frame 33 so that the U-shaped frame 33 can only be lifted and moved. The U-shaped frame 33 can support the clamp at the top of the spring, wherein the clamps at both ends of the spring can be respectively connected to the U-shaped frame 33 and the body 1 by bolt connection, etc., so as to facilitate the replacement of the clamps.

[0031] After the permanent magnet synchronous motor 31 is running, it will drive the ball screw 32 to rotate, and cooperate with the limit rod 34 to drive the U-shaped frame 33 to move up and down. After the U-shaped frame 33 is raised and lowered, it will drive the clamp at the top of the spring to rise and fall, and the clamp at the bottom of the spring is fixed to the bottom of the body 1, so that the spring can be repeatedly stretched and compressed by repeatedly raising and lowering the U-shaped frame 33, thereby performing a fatigue life test of the spring.

[0032] Reference Figure 1-3 The detection and processing mechanism includes a plurality of displacement sensors 4 fixedly mounted on the outside of the two sets of clamps and used for real-time monitoring of the spring deformation, a microprocessor 41 fixedly arranged in the body 1 and used for processing the detection information of the displacement sensor 4, and a visual operation display screen 42 fixedly mounted on the outer wall of the body 1 and used for displaying the information processed by the microprocessor 41 and providing user operation. The permanent magnet synchronous motor 31 can adopt the series product of model MSM-J3, the ball screw can adopt the product of specification SFU4010-3600L, the displacement sensor 4 can adopt the RHM0550MD series linear encoder, the microprocessor 41 can adopt the TI CC2530F256 chip, which supports wireless communication function, which is conducive to the subsequent function upgrade and expansion. Among them, the displacement sensor 4, the microprocessor 41 and the visual operation display screen 42 and other components are all common electrical appliances, and their internal structure and circuit connection have been disclosed, so they will not be elaborated here.

[0033] Displacement sensors 4 are distributed around the test area and are used to monitor the changes in spring deformation in real time, and convert them into electrical signals and transmit them to the microprocessor 41 for data analysis and processing; the microprocessor 41 integrates advanced signal acquisition and processing algorithms, which can process the information transmitted by the displacement sensor 4 and transmit the information to the visual operation display screen 42 for display, so that staff can easily and quickly set experimental parameters and view test results.

[0034] Reference Figure 1 A protective door 11 is rotatably provided on one side of the body 1, and an observation window is fixedly provided inside the protective door 11. The body 1 and the protective door 11 can be made of anti-interference shielding materials that can shield external clutter interference to minimize external interference on the test inside the body, and avoid springs made of certain special materials that may encounter electromagnetic interference and affect the test accuracy. The staff can inspect the internal components of the body 1 through the observation window.

[0035] The implementation principle of a spring fatigue life testing machine in the embodiment of the present utility model is:

[0036] During use, the staff can place one end of the spring to be tested between two adjacent clamping plates 22, and then shake the handle 25 to drive the bidirectional screw rod 21 to rotate. After the bidirectional screw rod 21 rotates, it cooperates with the limit of the clamping frame 2 to drive the two adjacent clamping plates 22 to move closer or farther away from each other, so that the two clamping plates 22 after movement can quickly clamp one end of the spring through the trapezoidal groove 23. Then repeat the above steps to clamp the other end of the spring on the other set of clamps, so that the two ends of the spring can be clamped and fixed using two sets of clamps.

[0037] Then, the permanent magnet synchronous motor 31 is operated to drive the ball screw 32 to rotate, and the limiting rod 34 is used to limit the U-shaped frame 33 to move up and down. When the U-shaped frame 33 is raised and lowered, the clamp at the top of the spring is also raised and lowered, while the clamp at the bottom of the spring is fixed to the bottom of the body 1. By repeatedly raising and lowering the U-shaped frame 33, the spring can be repeatedly stretched and compressed in different lengths and degrees to simulate the tension and compression of the spring under actual working conditions, thereby conducting a fatigue life test of the spring.

[0038] At the same time, during the test, the displacement sensor 4 can monitor the changes in the spring deformation in real time, and convert it into an electrical signal and transmit it to the microprocessor 41 for data analysis and processing. The microprocessor 41 can process the information transmitted by the displacement sensor 4 and transmit the information to the visual operation display screen 42 for display, so that the staff can easily and quickly set the experimental parameters and view the test results.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spring fatigue life testing machine, comprising a machine body (1), a spring, two sets of clamps installed in the machine body (1) and used to clamp the two ends of the spring, a power drive mechanism installed in the machine body (1) and used to repeatedly pull and press the clamped spring, and a detection and processing mechanism installed in the machine body (1), characterized in that: A fixing plate (3) is fixedly provided on the top inner side of the machine body (1), and the power drive mechanism comprises a permanent magnet synchronous motor (31) fixedly provided on the top of the fixing plate (3), a ball screw (32) fixedly provided on the bottom of the output end of the permanent magnet synchronous motor (31), and a U-shaped frame (33) fixedly provided on the outside of the nut of the ball screw (32), the clamp at the top end of the spring is detachably provided on the bottom of the U-shaped frame (33), the clamp at the bottom end of the spring is detachably provided on the bottom inner side of the machine body (1), and a limiting rod (34) is fixedly provided on the top of the U-shaped frame (33), the top end of which penetrates and extends to the outside of the fixing plate (3); The detection and processing mechanism includes a plurality of displacement sensors (4) fixedly mounted on the outside of the two groups of clamps and used for real-time monitoring of spring deformation, a microprocessor (41) fixedly mounted in the body (1) and used for processing detection information of the displacement sensors (4), and a visual operation display screen (42) fixedly mounted on the outer wall of the body (1) and used for displaying information processed by the microprocessor (41) for user operation.

2. A spring fatigue life testing machine according to claim 1, characterized in that: The clamp comprises a clamping frame (2), a bidirectional screw rod (21) rotatably arranged in the clamping frame (2), and a clamping plate (22) with threads arranged on the outer walls of both ends of the bidirectional screw rod (21).

3. A spring fatigue life testing machine according to claim 2, characterized in that: The top end of the clamping plate (22) is slidably arranged in a corresponding clamping frame (2), and both sides of the clamping frame (2) are provided with notches for the clamping plate (22) to slide through.

4. A spring fatigue life testing machine according to claim 3, characterized in that: A trapezoidal groove (23) is provided on one side of the clamping plate (22), and one end of the spring is clamped in the trapezoidal grooves (23) of two adjacent clamping plates (22).

5. A spring fatigue life testing machine according to claim 4, characterized in that: A plurality of rubber protrusions (24) for preventing the spring from slipping are fixedly provided in the trapezoidal groove (23) of the clamping plate (22).

6. A spring fatigue life testing machine according to claim 5, characterized in that: One end of the bidirectional screw rod (21) is fixed with a crank handle (25) located outside the clamping frame (2).

7. A spring fatigue life testing machine according to claim 6, characterized in that: A rotating plate (26) is fixedly provided on one end of the bidirectional screw rod (21) away from the crank handle (25), and the rotating plate (26) is rotatably connected in the clamping frame (2).

8. The spring fatigue life testing machine according to claim 1, characterized in that: A protective door (11) is rotatably provided on one side of the machine body (1), and an observation window is fixedly provided inside the protective door (11).

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