Spring fatigue performance detection device

Abstract

The invention provides a spring fatigue performance detection device, and relates to the technical field of spring detection, the spring fatigue performance detection device comprises a base, and the top of the base is provided with a detection mechanism used for detecting spring performance. Through the arrangement of the detection mechanism, the output ends of the two air cylinders are made to stretch and contract in a staggered mode, the rectangular frame can continuously move, then the tensile strength of springs of different specifications can be detected, after the air cylinders are perpendicular to the base, inclined blocks can push limiting blocks installed on cylinders under the action of the air cylinders, and the detection efficiency is improved. When two spring fatigue performance detection devices are spliced together for use, the cylinders on the two devices are mutually staggered to stretch and contract, so that the two to-be-detected springs are repeatedly stretched and compressed back and forth, and the fatigue performance detection is carried out. And the detection mechanism can perform different performance detection on the spring in different states, and the functionality is high.

Description

Technical Field

[0001] The present invention relates to the technical field of spring detection, and in particular to a spring fatigue performance detection device. Background Art

[0002] Spring shock absorbers are widely used in electric vehicles, bicycles, new energy vehicles and other fields. The stiffness parameters of spring shock absorbers need to be obtained through experimental testing. The spring, as the main component of the spring shock absorber, is a mechanical part that uses elasticity to work. Parts made of elastic materials deform under the action of external force. After the spring is produced, it is necessary to carry out necessary performance tests on the spring to ensure that it meets the qualified standards.

[0003] At present, the springs on most spring shock absorbers need to be sampled and tested during the production process to check whether their fatigue, rigidity and other properties meet the standards. Among the existing testing equipment, most use cylinders or hydraulic cylinders as driving forces, but different springs have different stretching strokes, and the stroke of the cylinder or hydraulic cylinder is fixed, so it is difficult to adapt to the testing of springs of different specifications and models.

[0004] For example, the description of the "Spring Tensile Rigidity Test Equipment" disclosed in the Chinese invention patent (publication number: CN116380674B) discloses that the current detection of spring elastic coefficients is mostly the maximum elastic force value detection, which is not conducive to the analysis of elastic data of different compression amounts, and the spring is not easy to position during the elastic test. In addition, the stretching stroke of the spring tensile test is relatively long, and when a hydraulic cylinder is usually used as the driving force, it will be limited by the stroke of the hydraulic cylinder, and it is difficult to adapt to the tensile test of springs of different specifications and models; the above patent can prove the defects of the existing technology.

[0005] Therefore, we made improvements to this and proposed a spring fatigue performance testing device. Summary of the invention

[0006] The purpose of the present invention is to conduct sampling inspection on the springs of most existing spring shock absorbers during the production process to detect whether their fatigue, rigidity and other properties meet the standards. In the existing testing equipment, most of them use cylinders or hydraulic cylinders as driving forces, but different springs have different stretching strokes, while the stroke of the cylinder or hydraulic cylinder is fixed, so it is difficult to adapt to the problem of testing springs of different specifications and models.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention provides a spring fatigue performance detection device to improve the above-mentioned problem.

[0008] The specific application is as follows:

[0009] It comprises a base, and a detection mechanism for detecting spring performance is arranged on the top of the base;

[0010] The detection mechanism includes a fixed frame fixedly installed on one side of the top of the base, a movable frame used in conjunction with the fixed frame is provided on the other side of the top of the base, cylinders for placing the two ends of the spring to be tested are provided on the top of the opposite side of the fixed frame and the movable frame, the cylinder on the fixed frame is rotatably connected, the cylinder on the movable frame is fixedly connected, a pointer is provided on the top of the cylinder on the fixed frame, and an angle scale line cooperating with the pointer is provided on one side of the fixed frame, a U-shaped rod for fixing the end of the spring to be tested is provided inside the cylinder, and two cylinders for driving the movable frame to move are hinged on the top of the base.

[0011] As a preferred technical solution of the present application, a slot for the U-shaped rod to pass through is provided at the top of the cylinder, and both ends of the U-shaped rod pass through the bottom of the cylinder and are connected with nuts.

[0012] As a preferred technical solution of the present application, a rectangular frame is fixedly connected to the bottom of one side of the movable frame, a T-shaped rail is slidably connected to the inside of the rectangular frame, the T-shaped rail is fixedly installed in the middle of the top of the base, and a length scale line is set on one side of the rectangular frame.

[0013] As a preferred technical solution of the present application, an inclined block is provided at the output end of the cylinder, and an inclined groove used in conjunction with the inclined block is provided on the rectangular frame. By providing the inclined block and the inclined groove, when the cylinder is extended, the inclined surface between the inclined block and the inclined groove can push the rectangular frame and the movable frame to move. When the output end of the cylinder contracts, the inclined block can be moved laterally out of the inclined groove through the inclined surfaces on the inclined block and the inclined groove without affecting the movement of the rectangular frame. By staggered extension and contraction of the two cylinders, the rectangular frame can be continuously moved, and springs of different specifications can be tested.

[0014] As a preferred technical solution of the present application, a connecting block is slidably connected inside the inclined block, and one end of the connecting block is fixedly connected to the output end of the cylinder.

[0015] As a preferred technical solution of the present application, one end of the connecting block is fixedly connected to a return spring, and one end of the return spring is fixedly connected to one side of the inside of the inclined block. By arranging the return spring and the connecting block, when the inclined surface of the inclined groove is in contact with the inclined surface of the inclined block, the inclined block can move toward one end away from the inclined groove to compress the return spring. After the inclined block is separated from the inclined groove, it can enter the inside of the next inclined groove under the action of the return spring, thereby ensuring that the cylinder can drive the rectangular frame to move.

[0016] As a preferred technical solution of the present application, a limit block for limiting the rotation of the cylinder is provided between the cylinder and the cylinder, and a square groove matching the top of the rectangular frame is provided in the middle of the limit block.

[0017] As a preferred technical solution of the present application, two limit rods adapted to the grooves on the surface of the cylinder housing are fixedly connected to one side of the top of the base, and holes for inserting the limit rods are provided on both sides of the bottom end of the limit block.

[0018] As a preferred technical solution of the present application, an arc-shaped groove adapted to the cylinder is provided in the middle of the bottom end of the limit block, and two round holes for inserting U-shaped rods are provided on the limit block. When performing a torque performance test, the limit block can be installed on the cylinder so that the two U-shaped rods pass through the two round holes. The inclined block on the turned cylinder can fit with one side of the limit block, and the cylinder can be flipped back and forth through alternating extension and contraction, so that the maximum twisting angle test of the spring and the torque fatigue test can be performed.

[0019] As a preferred technical solution of the present application, both the fixed frame and the movable frame are provided with through holes for the rectangular frame to pass through.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the scheme of this application:

[0022] 1. By setting up the detection mechanism, the output ends of the two cylinders can be staggered to extend and contract, so that the rectangular frame can be continuously moved, and then the tensile strength of springs of different specifications can be tested. When the cylinder is perpendicular to the base, the inclined block can push the limit block installed on the cylinder under the action of the cylinder, so that the cylinder can rotate back and forth, thereby testing the torsion performance of the spring. When the two spring fatigue performance testing devices are spliced ​​and used together, the cylinders on the two devices can be staggered to extend and contract, so that the two springs to be tested can be stretched and compressed repeatedly back and forth to perform fatigue performance testing. The detection mechanism can perform different performance tests on the springs under different states, and has strong functionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the spring fatigue performance testing device provided in this application;

[0024] Figure 2 The spring fatigue performance detection device provided in this application Figure 1 A is an enlarged structural diagram;

[0025] Figure 3 Schematic diagram of a spring to be tested fixed by a U-shaped rod of the spring fatigue performance testing device provided in the present application;

[0026] Figure 4 A schematic diagram of a cross-sectional structure of an inclined block of a spring fatigue performance testing device provided in the present application;

[0027] Figure 5A schematic diagram of the top structure of the base of the spring fatigue performance testing device provided in this application;

[0028] Figure 6 A schematic diagram of the separation structure of the base and the limit block of the spring fatigue performance testing device provided in this application;

[0029] Figure 7 The spring fatigue performance detection device provided in this application Figure 6 The enlarged structural diagram at B in the middle;

[0030] Figure 8 A schematic diagram of the structure of the spring fatigue performance testing device provided in the present application after the limit block is flipped;

[0031] Fig. 9 A schematic diagram of the structure of the testing mechanism of the spring fatigue performance testing device provided in the present application for testing the torsional performance of the spring to be tested;

[0032] Fig.10 The spring fatigue performance detection device provided in this application Fig. 9 Schematic diagram of the structure of the middle limit block from side view;

[0033] Fig.11 Schematic diagram of fatigue performance test on two springs to be tested after the two spring fatigue performance detection devices provided in this application are connected together.

[0034] Indicated in the figure:

[0035] 1. Base;

[0036] 2. Detection mechanism; 201. Fixed frame; 202. Movable frame; 203. Cylinder; 204. Slot; 205. U-shaped rod; 206. Nut; 207. Cylinder; 208. Rectangular frame; 209. T-shaped rail; 210. Oblique block; 211. Oblique groove; 212. Connecting block; 213. Reset spring; 214. Limit block; 215. Limit rod; 216. Socket; 217. Arc groove; 218. Square groove; 219. Round hole; 220. Through hole. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] As described in the background technology, the springs on most spring shock absorbers need to be sampled and tested during the production process to check whether their fatigue, rigidity and other properties meet the standards. Among the existing testing equipment, most use cylinders or hydraulic cylinders as driving forces, but different springs have different stretching strokes, and the stroke of the cylinder or hydraulic cylinder is indeed fixed, so it is difficult to adapt to the testing of springs of different specifications and models.

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] Example 1, please refer to Figure 1-Figure 8 , a spring fatigue performance detection device, comprising a base 1, a detection mechanism 2 for detecting spring performance is arranged on the top of the base 1;

[0043] The detection mechanism 2 includes a fixed frame 201 fixedly mounted on one side of the top of the base 1, and a movable frame 202 used in conjunction with the fixed frame 201 is provided on the other side of the top of the base 1. The tops of the opposite sides of the fixed frame 201 and the movable frame 202 are both provided with cylinders 203 for placing the two ends of the spring to be tested. The cylinder 203 on the fixed frame 201 is rotatably connected, and the cylinder 203 on the movable frame 202 is fixedly connected. A pointer is provided on the top of the cylinder 203 on the fixed frame 201, and an angle scale line cooperating with the pointer is provided on one side of the fixed frame 201. A U-shaped rod 205 for fixing the end of the spring to be tested is provided inside the cylinder 203, and two cylinders 207 for driving the movable frame 202 to move are hinged on the top of the base 1.

[0044] The top of the cylinder 203 is provided with a slot 204 for the U-shaped rod 205 to pass through. Both ends of the U-shaped rod 205 pass through the bottom of the cylinder 203 and are connected with nuts 206. By providing the slot 204, people can pass the U-shaped rod 205 through the slot 204 into the interior of the cylinder 203, and when both ends pass through the bottom of the cylinder 203, the nuts 206 can clamp one end of the spring to be tested. Figure 3 As shown, it should be noted that the holes on the cylinder 203 for the two ends of the U-shaped rod 205 to pass through are not drawn.

[0045] A rectangular frame 208 is fixedly connected to the bottom of one side of the movable frame 202, and a T-shaped rail 209 is slidably connected inside the rectangular frame 208. The T-shaped rail 209 is fixedly installed in the middle of the top of the base 1. A length scale line is set on one side of the rectangular frame 208, such as Figure 1 As shown, the stretched length of the spring to be tested is determined according to the position of the end of the base 1 close to the movable frame 202 pointing to the length scale line.

[0046] The output end of the cylinder 207 is provided with an inclined block 210, and the rectangular frame 208 is provided with an inclined groove 211 used in conjunction with the inclined block 210. By providing the inclined block 210 and the inclined groove 211, when the cylinder 207 is extended, the inclined surface between the inclined block 210 and the inclined groove 211 can push the rectangular frame 208 and the movable frame 202 to move. When the output end of the cylinder 207 is contracted, the inclined block 210 and the inclined surface on the inclined groove 211 can make the inclined block 210 move laterally out of the inclined groove 211 without affecting the movement of the rectangular frame 208. By staggered extension and contraction of the two cylinders 207, the rectangular frame 208 can be continuously moved, and springs of different specifications can be tested.

[0047] The interior of the inclined block 210 is slidably connected with a connecting block 212 , and one end of the connecting block 212 is fixedly connected to the output end of the cylinder 207 .

[0048] One end of the connecting block 212 is fixedly connected to a return spring 213, and one end of the return spring 213 is fixedly connected to one side of the inside of the inclined block 210. By arranging the return spring 213 and the connecting block 212, when the inclined surface of the inclined groove 211 is in contact with the inclined surface of the inclined block 210, the inclined block 210 can move toward one end away from the inclined groove 211 to compress the return spring 213. After the inclined block 210 is separated from the inclined groove 211, it can enter the inside of the next inclined groove 211 under the action of the return spring 213, thereby ensuring that the cylinder 207 can drive the rectangular frame 208 to move.

[0049] A limit block 214 is provided between the cylinder 207 and the cylinder 203 for limiting the rotation of the cylinder 207. A square groove 218 is provided in the middle of the limit block 214 to match the top of the rectangular frame 208. Through the limitation of the square groove 218, when the cylinder 207 drives the rectangular frame 208 to move, the cylinder 207 cannot flip over due to the reaction force.

[0050] One side of the top of the base 1 is fixedly connected to two limit rods 215 that are compatible with the grooves on the surface of the cylinder 207 shell. Both sides of the bottom of the limit block 214 are provided with holes 216 for the limit rods 215 to be inserted. By setting the limit rods 215 and the holes 216, the limit block 214 can be fixed on the base 1 and is not easy to move. When the limit block 214 is separated from the base 1 and the cylinder 207 is rotated, the limit rod 215 can enter the groove on the surface of the cylinder 207 shell to provide lateral support for the cylinder 207, thereby reducing the burden on the hinge on the cylinder 207.

[0051] An arc groove 217 matched with the cylinder 203 is provided in the middle of the bottom end of the limit block 214, and two round holes 219 for inserting the U-shaped rods 205 are provided on the limit block 214. When performing a torque performance test, the limit block 214 can be installed on the cylinder 203 so that the two U-shaped rods 205 pass through the two round holes 219. The inclined block 210 on the turned cylinder 207 can fit with one side of the limit block 214. By alternately extending and contracting, the cylinder 203 can be flipped back and forth, so that the maximum twisting angle test of the spring and the torque fatigue test can be carried out.

[0052] The fixed frame 201 and the movable frame 202 are both provided with through holes 220 for the rectangular frame 208 to pass through.

[0053] The use process of the spring fatigue performance detection device provided in this embodiment is as follows:

[0054] Test the tensile length of the spring to be tested: Figure 1 As shown, the two ends of the spring to be tested are placed in the two cylinders 203, and the two U-shaped rods 205 are respectively passed through the two slots 204 to press the two ends of the spring to be tested. Figure 3 As shown, multiple nuts 206 are screwed onto the two ends of the U-shaped rod 205 so that the two ends of the spring to be tested are fixed in the two cylinders 203, as shown in FIG. Figure 1As shown, the output ends of the two cylinders 207 are alternately extended or contracted. When the output ends are extended, the plane at the end of the inclined block 210 contacts the plane inside the inclined slot 211, and then the rectangular frame 208 is extended under the push of the output end of the cylinder 207. At this time, the output end of the other cylinder 207 contracts. During the contraction process, the inclined surface at the end of the inclined block 210 contacts the inclined surface inside the inclined slot 211, and the inclined block 210 is pushed out of the inclined slot 211. Under the action of the return spring 213, it fits with the surface of the rectangular frame 208 and finally enters the next inclined slot 211. The two cylinders 2 07 Repeat the above actions, the movable frame 202 moves under the action of the cylinder 207, and then the two cylinders 203 stretch the spring to be tested under the action of the U-shaped rod 205. The stretched length of the spring to be tested can be judged by the position of the scale line on the rectangular frame 208 pointed by the end of the base 1. When the spring is stretched to the preset length, it means that the tensile performance of the spring is qualified. If it breaks before reaching the preset length, the spring is judged to be unqualified. It should be noted that the preset length can be adjusted according to different types of springs and usage requirements, and is not a fixed value. Therefore, the detailed length is not disclosed in the present invention.

[0055] Embodiment 2 further optimizes the spring fatigue performance detection device provided in Embodiment 1. Specifically, the use process of the spring fatigue performance detection device provided in this embodiment is as follows:

[0056] Please refer to Figure 9-10 When the torsion test of the spring to be tested is required, the spring to be tested is installed in accordance with the method of Example 1, and then the stop block 214 is pulled out, the stop block 214 is turned 90 degrees, and is sleeved on one of the cylinders 203, so that the ends of the U-shaped rod 205 pass through the two circular holes 219 as shown in FIG. Fig. 9In the state shown, the output end of one cylinder 207 is controlled to extend, and the output end of the other cylinder 207 is contracted, so that the limit block 214 is tilted, and then one end of the spring to be tested is twisted. The pointer on the cylinder 203 and the scale on the fixed frame 201 are used to judge whether the torsion angle of the spring to be tested reaches the preset torsion angle. If it reaches, it indicates that it is qualified. If it breaks before reaching, it indicates that it is unqualified. It should be noted that the preset torsion angle can be adjusted according to different types of springs and usage requirements, and is not a fixed value. Therefore, the detailed torsion angle is not disclosed in the present invention. Through the above method, torsion fatigue detection can also be performed. By repeatedly controlling the output end of one cylinder 207 to extend, and the output end of the other cylinder 207 to contract, the limit block 214 is tilted, and then one end of the spring to be tested is twisted. The pointer on the cylinder 203 and the scale on the fixed frame 201 are used to judge whether the torsion angle of the spring to be tested reaches the preset torsion angle. If it reaches, it indicates that it is qualified. If it breaks before reaching, it indicates that it is unqualified. It should be noted that the preset torsion angle can be adjusted according to different types of springs and usage requirements. It is not a fixed value. Therefore, the detailed torsion angle is not disclosed in the present invention. Through the above method, torsion fatigue detection can also be performed. By repeatedly controlling the output end of one cylinder 207 to extend, and the output end of the other cylinder 207 to contract, the limit block 214 is tilted, and then one end of the spring to be tested is twisted. The output end of the spring contracts, causing one end of the spring to be tested to twist repeatedly. At this time, the two cylinders 207 need to be controlled to be extended to the same length to ensure the same twisting angle, and when the same batch of springs to be tested are subjected to torsional fatigue testing, the twisting angle needs to be controlled to be the same as the expansion and contraction frequency and the number of expansion and contraction times of the cylinder 207. If it breaks before the specified number of torsion times is reached, it is judged to be unqualified, otherwise it is qualified. It should be noted that the torsion angle of the spring to be tested and the expansion and contraction frequency and the number of expansion and contraction times of the cylinder 207 can be adjusted according to different types of springs and usage requirements, and are not fixed values. Therefore, they are not disclosed in detail in the present invention, and the expansion and contraction control and frequency control of the cylinder 207 are existing mature and well-known technologies, so they will not be repeated or disclosed.

[0057] Example 3 further optimizes the spring fatigue performance detection device provided in Example 1 or 2. Specifically, please refer to Fig.11 When the spring to be tested needs to be subjected to tensile and compressive fatigue testing, the spring to be tested is installed in the manner of Example 1, and the movable frames 202 on the two spring fatigue performance testing devices are attached together, such as Fig.11As shown, the two bases 1 are fixed, and the two bases 1 can be connected by bolts. It should be noted that the connection and fixation of the base 1 are existing well-known technologies, so they are not repeated here. The two cylinders 207 on the same spring fatigue performance testing device are controlled to extend or contract at the same time, and the cylinders 207 on the two spring fatigue performance testing devices are extended or contracted alternately. At this time, the two springs to be tested will be repeatedly stretched and compressed under the action of the four cylinders 207. If it is necessary to change the stretching and compression of the springs to be tested, the two cylinders 207 on the same spring fatigue performance testing device can be used to extend or contract alternately, so that the movable frame 202 on the spring fatigue performance testing device moves toward another spring fatigue performance testing device, and gradually moves to the T-shaped track on the other spring fatigue performance testing device. 209, the cylinder 207 on the other spring fatigue performance testing device does not apply power. At this time, one of the two springs to be tested is stretched and the other is compressed. By alternately controlling the cylinders 207 on the two spring fatigue performance testing devices to act or not, the two cylinders 207 are controlled to alternately extend or contract when in action, so that the two springs to be tested can be subjected to stretching and compression fatigue testing, and the stretching and compression amounts of the springs to be tested can be changed according to actual needs. When the same batch of springs are subjected to stretching and compression fatigue testing, the frequency and number of stretching and compression must be controlled to be the same. If the spring is broken after reaching the specified number of stretching and compression times, it is qualified, otherwise it is unqualified. It should be noted that the number and frequency of spring stretching and compression can be adjusted according to different types of springs and usage requirements, and are not fixed values. Therefore, they are not disclosed in detail in the present invention.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A spring fatigue performance detection device, characterized in that: It comprises a base (1), the top of which is provided with a detection mechanism (2) for detecting spring performance; The detection mechanism (2) comprises a fixed frame (201) fixedly mounted on one side of the top of the base (1); a movable frame (202) used in conjunction with the fixed frame (201) is provided on the other side of the top of the base (1); cylinders (203) for placing the two ends of a spring to be tested are provided on the tops of the opposite sides of the fixed frame (201) and the movable frame (202); a U-shaped rod (205) for fixing the ends of the spring to be tested is provided inside the cylinder (203); and two cylinders (207) for driving the movable frame (202) to move are hingedly connected to the top of the base (1).

2. A spring fatigue performance detection device according to claim 1, characterized in that: The top of the cylinder (203) is provided with a slot (204) for the U-shaped rod (205) to pass through, and both ends of the U-shaped rod (205) pass through the bottom of the cylinder (203) and are connected with nuts (206).

3. A spring fatigue performance detection device according to claim 2, characterized in that: A rectangular frame (208) is fixedly connected to the bottom of one side of the movable frame (202), a T-shaped rail (209) is slidably connected inside the rectangular frame (208), the T-shaped rail (209) is fixedly installed in the middle of the top of the base (1), and a length scale line is provided on one side of the rectangular frame (208).

4. A spring fatigue performance detection device according to claim 3, characterized in that: An inclined block (210) is provided at the output end of the cylinder (207), and an inclined groove (211) used in conjunction with the inclined block (210) is provided on the rectangular frame (208).

5. A spring fatigue performance detection device according to claim 4, characterized in that: The interior of the inclined block (210) is slidably connected to a connecting block (212), and one end of the connecting block (212) is fixedly connected to the output end of the cylinder (207).

6. A spring fatigue performance detection device according to claim 5, characterized in that: One end of the connection block (212) is fixedly connected to a return spring (213), and one end of the return spring (213) is fixedly connected to one side inside the inclined block (210).

7. A spring fatigue performance detection device according to claim 6, characterized in that: A limit block (214) for limiting the rotation of the cylinder (207) is arranged between the cylinder (207) and the cylinder (203), and a square groove (218) matching the top of the rectangular frame (208) is opened in the middle of the limit block (214).

8. A spring fatigue performance detection device according to claim 7, characterized in that: Two limiting rods (215) adapted to grooves on the surface of the cylinder (207) shell are fixedly connected to one side of the top of the base (1), and both sides of the bottom of the limiting block (214) are provided with insertion holes (216) for the limiting rods (215) to be inserted.

9. A spring fatigue performance detection device according to claim 8, characterized in that: An arc-shaped groove (217) adapted to the cylinder (203) is provided in the middle of the bottom end of the limit block (214), and two round holes (219) for inserting the U-shaped rod (205) are provided on the limit block (214).

10. A spring fatigue performance detection device according to claim 9, characterized in that: The fixed frame (201) and the movable frame (202) are both provided with through holes (220) for the rectangular frame (208) to pass through.

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