Device for detecting fatigue life of mechanical part

Abstract

The utility model discloses a device for detecting the fatigue life of a mechanical part, which belongs to the technical field of fatigue life detection equipment and comprises a base and a supporting seat and further comprises an inner shell fixedly mounted on the base, and the supporting seat is fixedly mounted on the inner shell; the motor is fixedly mounted in an inner cavity of the inner shell; the electric telescopic rod is vertically and fixedly installed in the inner shell, and the output end of the electric telescopic rod penetrates out of the supporting base. The clamping rod is located at the position close to the circle center of the supporting base before use, after the spring is installed, the clamping rod moves in the direction away from the circle center of the supporting base through work of the motor until the clamping rod makes contact with the spring, and therefore it is guaranteed that the spring is not bent when compressed. Different devices or supports used for installing the springs do not need to be replaced according to the springs of different models.

Description

Technical Field

[0001] This utility model relates to the technical field of fatigue life testing equipment, specifically a device for testing the fatigue life of mechanical parts. Background Technology

[0002] Fatigue life refers to the number of stress cycles a material experiences before fatigue failure. The fatigue life of a component before the appearance of engineering cracks is called crack initiation life, and the fatigue life from the propagation of engineering cracks to complete fracture is called crack propagation life. The total life is the sum of the two.

[0003] Springs are a widely used mechanical part. After production, springs need to be sampled for inspection, and the inspection procedure includes testing their fatigue life.

[0004] To prevent the spring from bending or popping out during testing, some testing devices install the spring on a cylindrical bracket that matches the spring's diameter. The spring is then repeatedly compressed using a crank-connecting rod mechanism or an electric telescopic rod. At the same time, pressure testing equipment is used to detect the pressure changes during the repeated compression and reset of the spring.

[0005] However, since springs come in different models and have different diameters, different testing equipment or different brackets are needed to ensure that the springs can be compressed correctly during testing and do not bend under force. This process is quite troublesome and reduces operational efficiency.

[0006] Therefore, we propose a device for detecting the fatigue life of mechanical parts in order to solve the problems mentioned above.

[0007] The information disclosed above in this background section is only intended to enhance the understanding of the background section of this utility model, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0008] The purpose of this invention is to provide a device for detecting the fatigue life of mechanical parts, in order to solve the problem mentioned in the background art that the existing technology is difficult to adapt to different spring diameters and requires the replacement of corresponding components according to springs of different diameters.

[0009] To achieve the above objectives, this utility model provides a device for detecting the fatigue life of mechanical parts, including a base and a support, and further comprising:

[0010] The inner shell is fixedly installed on the base, and the support base is fixedly installed on the inner shell;

[0011] The motor is fixedly installed in the inner cavity of the inner shell;

[0012] An electric telescopic rod is vertically fixed in the inner shell, with its output end extending to the outside of the support base;

[0013] The transmission assembly is located in the inner cavity of the support base;

[0014] The clamping rods are provided in at least three sets, which are vertically arranged on the transmission assembly and distributed in a circumferential array with the center of the support base as the center. The output shaft of the motor is connected to the clamping rods through a linear transmission assembly, and the movement direction of the clamping rods is horizontal.

[0015] The mounting block is located at the top of the electric telescopic rod, and a tension sensor is provided between the mounting block and the output end of the electric telescopic rod.

[0016] The number of pressure blocks is the same as the number of clamping rods, and each pressure block is slidably connected to the clamping rod. An outer stop block is also fixedly installed on the side of the pressure block away from the center of the support base, and a pressure sensor is also provided on the outer side of the outer stop block.

[0017] The pressure block and the mounting block are elastically connected by a telescopic component;

[0018] The base is equipped with a control module, which is electrically connected to the motor, electric telescopic rod, tension sensor, and pressure sensor.

[0019] Preferably, the support base includes a support ring, and the support ring has a first sliding groove and a mounting groove;

[0020] The number of the first grooves is the same as the number of the clamping rods, and they are distributed in a circumferential array with the center of the support ring as the center.

[0021] The mounting groove is concentric with the support ring;

[0022] The transmission assembly includes a first gear, a second gear, a third gear, and a transmission rod;

[0023] The first gear is fixedly mounted on the output shaft of the motor, and the second gear is disposed in the mounting groove of the support ring, with its bottom end penetrating into the inner shell and meshing with the first gear.

[0024] The number of the third gears is the same as the number of the clamping rods, and they are arranged in a circumferential array in the mounting groove. The third gears are rotatably connected in the support ring, and the third gears mesh with the second gears.

[0025] The transmission rod is movably installed in the first slide groove and meshes with the third gear;

[0026] The clamping rod is fixedly installed on the transmission rod.

[0027] Preferably, the support ring is also horizontally fixedly mounted with a guide block located in the first groove;

[0028] The transmission rod includes a slide bar, which has teeth and meshes with the third gear through the teeth;

[0029] The slide bar is also provided with a second slide groove;

[0030] The guide block is located within the second groove.

[0031] Preferably, the telescopic assembly includes a fixed rod, a movable rod, and a return spring;

[0032] The number of fixed rods and movable rods is the same as the number of clamping rods;

[0033] The fixed rod is fixedly installed on the mounting block, and each of the movable rods is movably sleeved on each of the fixed rods;

[0034] Each of the movable rods is fixed to each of the pressure blocks;

[0035] The reset spring is mounted on the movable rod, and its two ends are fixed to the fixed rod and the pressure block, respectively.

[0036] Preferably, it further includes a guide rod, the guide rod having a limiting groove, and the number of the limiting grooves is the same as the number of the clamping rods;

[0037] The bottom end of the guide rod is fixedly mounted on the base and is concentric with the support ring. The guide rod passes through the second gear and extends to the outside of the support ring.

[0038] The electric telescopic rod, the tension sensor, and the mounting block are all located inside the guide rod.

[0039] The fixing rod passes through the limiting groove.

[0040] Preferably, a protective case is also included;

[0041] The protective box includes an outer box body and a box cover;

[0042] The outer casing is bolted to the base, and the casing cover is rotatably connected to the top surface of the outer casing.

[0043] Compared with the prior art, the beneficial effects of this utility model are:

[0044] (1) This utility model uses a motor-driven transmission component to enable the clamping rod to move horizontally, and the straight path of the movement passes through the center of the support base. Before use, the clamping rod is in a position close to the center of the support base. After the spring is installed, the motor drives the clamping rod to move away from the center of the support base until it contacts the spring, thereby ensuring that the spring does not bend when compressed. Compared with the prior art, it is not necessary to change different equipment or brackets for installing springs according to different models of springs.

[0045] (2) This utility model applies a downward force to the spring under test by using the outer stop block, thereby compressing the spring. Before testing, the clamping rod, pressure block and outer stop block are located near the center of the support base. Therefore, when installing the spring, the outer stop block will not prevent the spring from being installed, and there is no need to remove the mounting block and the outer stop block, making the operation more convenient.

[0046] (3) This utility model has protective capabilities by installing a protective box on the base to prevent the spring fragments from flying when the spring is damaged and broken.

[0047] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0049] Figure 2 This is a schematic diagram of the structure of the pressure block, electric telescopic rod, motor, and transmission assembly of this utility model, with the pressure sensor hidden.

[0050] Figure 3 This is a schematic diagram of the structure of the support base of this utility model;

[0051] Figure 4 This is a schematic diagram of the transmission rod of this utility model;

[0052] Figure 5 This is a schematic diagram of the structure of the slide bar of this utility model installed inside the support ring;

[0053] Figure 6 for Figure 2 Enlarged view of the structure at point A in the middle;

[0054] Figure 7 This is a schematic diagram of the installation of the protective box in Embodiment 3 of this utility model.

[0055] In the diagram: 1. Base; 2. Inner shell; 3. Support base; 4. Guide rod; 5. Clamping rod; 6. Pressure block; 7. Motor; 8. Electric telescopic rod; 9. Transmission assembly; 10. Tension sensor; 11. Mounting block; 12. Telescopic assembly; 13. Limiting groove; 14. Protective box; 15. Outer stop block; 16. Pressure sensor; 17. Control module;

[0056] 301. Support ring; 302. First slide groove; 303. Mounting groove; 304. Guide block;

[0057] 901. First gear; 902. Second gear; 903. Third gear; 904. Transmission rod;

[0058] 9041, slide bar; 9042, tooth; 9043, second slide groove;

[0059] 1201. Fixed rod; 1202. Movable rod; 1203. Return spring;

[0060] 1401. Outer box; 1402. Box cover. Detailed Implementation

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. It should be noted that the drawings are schematic and not illustrated to scale. For clarity and convenience, the relative sizes and proportions of the parts shown in the drawings have been exaggerated or reduced in size. Any size is only illustrative and not limiting.

[0062] Example 1:

[0063] Please see Figures 1-2A device for detecting the fatigue life of mechanical parts includes: a base 1, an inner shell 2, a support 3, clamping rods 5, a pressure block 6, a motor 7, an electric telescopic rod 8, a transmission assembly 9, a tension sensor 10, a mounting block 11, and a telescopic assembly 12. The inner shell 2 is fixedly mounted on the base 1, and the support 3 is fixedly mounted on the inner shell 2. The motor 7 is fixedly mounted in the inner cavity of the inner shell 2. The electric telescopic rod 8 is vertically fixedly mounted in the inner shell 2, and its output end extends to the outside of the support 3. The transmission assembly 9 is located in the inner cavity of the support 3. Six sets of clamping rods 5 are vertically arranged on the transmission assembly 9 and are distributed in a circular array around the center of the support 3. The output shaft of the motor 7 is transmitted through a linear transmission assembly. 9 is connected to the clamping rod 5 in a transmission manner, and the movement direction of the clamping rod 5 is horizontal; the mounting block 11 is located at the top of the electric telescopic rod 8, and the tension sensor 10 is fixedly installed between the mounting block 11 and the output end of the electric telescopic rod 8; the number of pressure blocks 6 is the same as the number of clamping rods 5, and each pressure block 6 is slidably connected to the clamping rod 5. An outer stop block 15 is also fixedly installed on the side of the pressure block 6 away from the center of the support base 3, and a pressure sensor 16 is also provided on the outer side of the outer stop block 15; the pressure block 6 and the mounting block 11 are elastically connected through the telescopic assembly 12; the base 1 is provided with a control module 17, which is electrically connected to the motor 7, the electric telescopic rod 8, the tension sensor 10 and the pressure sensor 16.

[0064] Before use, the outer stop 15 is positioned near the center of the support base 3. The spring is then installed on the support base 3 and fitted around the clamping rod 5. The electric telescopic rod 8 is then activated via the control module 17, driving the outer stop 15 and pressure sensor 16 downwards until the pressure sensor 16 is inside the spring. The motor 7 is then activated via the control module 17, causing the clamping rod 5 to move away from the center of the support base 3 via the transmission assembly 9 until the pressure sensor 16 contacts the spring. At this point, the motor 7 stops, and the pressure sensor 16 displays the pressure reading on the control module 17. The reading can be adjusted based on the number of rotations of the motor 7. The horizontal displacement of the pressure sensor 16 is calculated to obtain the inner diameter of the spring. The control module 17 then sequentially drives the motor 7 and the electric telescopic rod 8 to move, resetting the outer stop 15 and the pressure sensor 16. The motor 7 drives the clamping rod 5 to move horizontally, the distance of which is determined by the previously calculated inner diameter of the spring, until the clamping rod 5 contacts the spring. At this point, the top of the spring to be tested is located below the outer stop 15. The electric telescopic rod 8 then operates, causing the outer stop 15 to press down. The pressure of the outer stop 15 compresses the spring to be tested. Through the repeated compression and reset action of the electric telescopic rod 8, the fatigue life of the spring is detected.

[0065] The advantages of the above technical solution are: it can be used for springs of different diameters. After installation, the clamping rod 5 can be made to contact the spring to be tested and then the outer stop 15 can be pressed down. The adjustment of the clamping rod 5 can prevent the spring from bending during compression. Therefore, it is not necessary to replace the brackets and other devices that are compatible with various types of springs.

[0066] Another advantage is that the pressure between the clamping rod 5 and the spring to be tested can be adjusted by controlling the motor 7, so as to avoid excessive friction caused by excessive pressure between the clamping rod 5 and the spring, and avoid excessive detection error. Since the size of the spring to be tested can be calculated by the pressure sensor 16, the movement distance of the clamping rod 5 can be controlled by controlling the number of rotations of the output shaft of the motor 7.

[0067] Please see Figures 1-5 The support base 3 includes a support ring 301, which has a first sliding groove 302 and a mounting groove 303. The number of first sliding grooves 302 is the same as the number of clamping rods 5, and they are arranged in a circumferential array with the center of the support ring 301 as the center. The mounting groove 303 is concentric with the support ring 301. The transmission assembly 9 includes a first gear 901, a second gear 902, a third gear 903, and a transmission rod 904. The first gear 901 is fixedly mounted on the output shaft of the motor 7, and the second gear 902 is located on the support ring 301. The support ring 301 is installed in the mounting groove 303, and its bottom end passes into the inner shell 2 and meshes with the first gear 901; the number of third gears 903 is the same as the number of clamping rods 5, and they are distributed in a circumferential array in the mounting groove 303. The third gears 903 are rotatably connected in the support ring 301, and the third gears 903 mesh with the second gear 902; the transmission rod 904 is movably installed in the first sliding groove 302 and meshes with the third gear 903; the clamping rod 5 is fixedly installed on the transmission rod 904.

[0068] By adopting the above technical solution, when in use, the rotation of the output shaft of the motor 7 drives the first gear 901 to rotate, and the third gear 903 is rotated through the transmission action of the second gear 902. The third gear 903 drives the transmission rod 904 to move linearly along the first slide groove 302, thereby adjusting the position of the clamping rod 5.

[0069] Please see Figures 3-5 The support ring 301 is also horizontally fixedly installed with a guide block 304 located in the first slide groove 302; the transmission rod 904 includes a slide rod 9041, the slide rod 9041 is provided with a tooth 9042, and meshes with the third gear 903 through the tooth 9042; the slide rod 9041 is also provided with a second slide groove 9043; the guide block 304 is located in the second slide groove 9043.

[0070] By adopting the above technical solutions, the slide bar 9041 can be kept stable during operation, and the guide block 304 can keep the slide bar 9041 in a horizontal state at all times.

[0071] Please see Figure 2 and Figure 6 The telescopic assembly 12 includes a fixed rod 1201, a movable rod 1202, and a return spring 1203; the number of fixed rods 1201 and movable rods 1202 is the same as that of the clamping rods 5; the fixed rods 1201 are fixedly installed on the mounting block 11, and each movable rod 1202 is movably sleeved on each fixed rod 1201; each movable rod 1202 is fixed to each pressure block 6; the return spring 1203 is provided on the movable rod 1202, and its two ends are fixed to the fixed rod 1201 and the pressure block 6 respectively.

[0072] By adopting the above technical solution, when the clamping rod 5 moves horizontally, it can drive the pressure block 6 to move horizontally, thereby causing the movable rod 1202 and the fixed rod 1201 to have relative displacement, thus avoiding affecting the normal operation of the clamping rod 5.

[0073] The advantage of the above technical solution is that, since some testing devices require the operator to separate the bracket used to install the spring from the device used to apply pressure in order to install the spring, the structure of the electric telescopic rod 8, mounting block 11, pressure block 6 and outer stop block 15 in the above technical solution does not require them to be removed during installation, so the operation is more convenient.

[0074] Example 2:

[0075] Please continue reading. Figure 1 , Figure 2 as well as Figure 6 Based on embodiment 1, it also includes a guide rod 4, which has a limiting groove 13, and the number of limiting grooves 13 is the same as the number of clamping rods 5; the bottom end of the guide rod 4 is fixedly installed on the base 1 and is concentric with the support ring 301; the guide rod 4 passes through the second gear 902 and extends to the outside of the support ring 301; the electric telescopic rod 8, the tension sensor 10 and the mounting block 11 are all located in the inner cavity of the guide rod 4; the fixing rod 1201 passes through the limiting groove 13.

[0076] By adopting the above technical solution, the guide rod 4 can make the operation of the whole device more stable during use. When the slide rod 9041 is closest to the support base 3, its end abuts against the guide rod 4. The fixed rod 1201 and the mounting block 11 are located on the inner and outer sides of the guide rod 4, respectively, so that it only moves in the vertical direction when it moves up and down.

[0077] Example 3:

[0078] Please see Figure 1 and Figure 7Based on Embodiment 1 or Embodiment 2, it also includes a protective box 14, which includes an outer box body 1401 and a box cover 1402; the outer box body 1401 is installed on the base 1 by bolts, and the box cover 1402 is rotatably connected to the top surface of the outer box body 1401.

[0079] By adopting the above technical solution, it is possible to avoid the flying of fragments when the spring breaks, thus avoiding danger. Furthermore, when installing or removing the spring, only the cover 1402 needs to be rotated to perform the corresponding operations.

[0080] Working principle: First, the spring to be tested is installed on the support base 3, with the bottom end of the spring located on the upper surface of the support base 3. The entire spring to be tested is located around the clamping rod 5. The electric telescopic rod 8 is started by the control module 17, driving the outer stop 15 and the pressure sensor 16 to move downwards until the pressure sensor 16 is inside the spring. Then, the motor 7 is started by the control module 17, and the clamping rod 5 moves away from the center of the support base 3 through the transmission component 9 until the pressure sensor 16 contacts the spring. The motor 7 then stops working, and the pressure sensor 16 displays the pressure reading on the control module 17. The horizontal displacement of the pressure sensor 16 can be calculated based on the number of rotations of the motor 7, thereby obtaining the inner diameter of the spring. The control module 17 causes the motor 7 and the electric telescopic rod 8 to move sequentially, causing the outer stop 15 and pressure sensor 16 to reset. The electric telescopic rod 8 then drives the outer stop 15 and pressure sensor 16 to rise. The motor 7 is then restarted, and its output shaft rotates, causing the clamping rod 5 to move away from the center of the support base 3 until the clamping rod 5 contacts the spring. At this point, the spring is positioned between the clamping rod 5 and the pressure sensor 16, and the pressure is appropriate. Then, the electric telescopic rod 8 is activated, causing the mounting block 11 to repeatedly press down and reset the outer stop 15. Based on the changes in the spring force detected by the tension sensor 10 during the process, the fatigue life value can be obtained after repeated detection and displayed on the control module 17.

[0081] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0082] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0083] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0084] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0087] Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the fatigue life of mechanical parts, comprising a base (1) and a support (3), characterized in that, Also includes: The inner shell (2) is fixedly installed on the base (1), and the support seat (3) is fixedly installed on the inner shell (2); The motor (7) is fixedly installed in the inner cavity of the inner shell (2); An electric telescopic rod (8) is vertically fixed in the inner shell (2), and its output end extends to the outside of the support base (3); The transmission assembly (9) is located in the inner cavity of the support base (3); The clamping rod (5) is provided in at least three sets, which are vertically arranged on the transmission assembly (9) and distributed in a circular array with the center of the support base (3) as the center. The output shaft of the motor (7) is connected to the clamping rod (5) through the linear transmission assembly (9), and the movement direction of the clamping rod (5) is horizontal. Mounting block (11), the mounting block (11) is located at the top of the electric telescopic rod (8), and a tension sensor (10) is provided between the mounting block (11) and the output end of the electric telescopic rod (8). The number of pressure blocks (6) is the same as the number of clamping rods (5), and each pressure block (6) is slidably connected to the clamping rod (5). An outer stop block (15) is also fixedly installed on the side of the pressure block (6) away from the center of the support base (3). A pressure sensor (16) is also provided on the outer side of the outer stop block (15). The pressure block (6) and the mounting block (11) are elastically connected by a telescopic component (12); The base (1) is equipped with a control module (17), which is electrically connected to the motor (7), electric telescopic rod (8), tension sensor (10) and pressure sensor (16).

2. The device for detecting the fatigue life of mechanical parts according to claim 1, characterized in that: The support base (3) includes a support ring (301), which has a first sliding groove (302) and a mounting groove (303). The number of the first grooves (302) is the same as the number of the clamping rods (5), and they are arranged in a circular array with the center of the support ring (301) as the center. The mounting groove (303) is concentric with the support ring (301); The transmission assembly (9) includes a first gear (901), a second gear (902), a third gear (903), and a transmission rod (904). The first gear (901) is fixedly mounted on the output shaft of the motor (7), and the second gear (902) is located in the mounting groove (303) of the support ring (301), with its bottom end penetrating into the inner shell (2) and meshing with the first gear (901). The number of the third gears (903) is the same as the number of the clamping rods (5), and they are arranged in a circumferential array in the mounting groove (303). The third gears (903) are rotatably connected in the support ring (301), and the third gears (903) mesh with the second gears (902). The transmission rod (904) is movably installed in the first slide groove (302) and meshes with the third gear (903); The clamping rod (5) is fixedly installed on the transmission rod (904).

3. The device for detecting the fatigue life of mechanical parts according to claim 2, characterized in that: The support ring (301) is also horizontally fixedly installed with a guide block (304) located in the first slide groove (302); The transmission rod (904) includes a slide rod (9041), the slide rod (9041) is provided with teeth (9042), and meshes with the third gear (903) through the teeth (9042); The slide bar (9041) is also provided with a second slide groove (9043); The guide block (304) is located within the second groove (9043).

4. The device for detecting the fatigue life of mechanical parts according to claim 3, characterized in that: The telescopic assembly (12) includes a fixed rod (1201), a movable rod (1202), and a return spring (1203). The number of the fixed rod (1201) and the movable rod (1202) is the same as that of the clamping rod (5); The fixed rod (1201) is fixedly installed on the mounting block (11), and each of the movable rods (1202) is movably sleeved on each of the fixed rods (1201); Each of the movable rods (1202) is fixed to each of the pressure blocks (6); The reset spring (1203) is mounted on the movable rod (1202), and its two ends are fixed to the fixed rod (1201) and the pressure block (6) respectively.

5. The device for detecting the fatigue life of mechanical parts according to claim 4, characterized in that: It also includes a guide rod (4), which has a limiting groove (13) and the number of the limiting groove (13) is the same as the number of the clamping rod (5); The bottom end of the guide rod (4) is fixedly installed on the base (1) and is concentric with the support ring (301). The guide rod (4) passes through the second gear (902) and extends to the outside of the support ring (301). The electric telescopic rod (8), the tension sensor (10), and the mounting block (11) are all located in the inner cavity of the guide rod (4); The fixing rod (1201) passes through the limiting groove (13).

6. The device for detecting the fatigue life of mechanical parts according to claim 1, characterized in that: It also includes a protective case (14); The protective box (14) includes an outer box body (1401) and a box cover (1402). The outer casing (1401) is bolted to the base (1), and the cover (1402) is rotatably connected to the top surface of the outer casing (1401).

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