Multipurpose high-frequency fatigue testing machine

Abstract

The invention belongs to the technical field of testing equipment, and particularly relates to a multipurpose high-frequency fatigue testing machine which comprises main control equipment and a fatigue testing machine body, the fatigue testing machine body comprises a bottom machine and an electromagnetic high-frequency generating machine body, and a balance weight table is assembled under the electromagnetic high-frequency generating machine body through connecting rod connection; clamp assemblies are assembled on the surface of the bottom machine and the lower surface of the counterweight table; the multiple balance weights are adjustably stacked on the surface of the balance weight table and used for being matched with the resonance points by replacing balance weights; and the plate clamp is detachably assembled with the clamp assembly and is used for detecting cracks generated in the test process of the test sample. The device can replace manpower to flexibly adjust the counterweight, realizes rapid and convenient operation, can timely detect a cracked plate in a test, and is convenient to timely stop the test before the sample is fractured.

Description

Technical Field

[0001] This invention belongs to the field of testing equipment technology, specifically relating to a multi-purpose high-frequency fatigue testing machine. Background Technology

[0002] The working principle of a high-frequency fatigue testing machine is mainly based on the principle of mechanical resonance. It generates high-frequency alternating loads through an electromagnetic or motor drive system to achieve efficient testing of the fatigue performance of materials. The high-frequency fatigue testing machine consists of a specimen, a mass block, a spring system, and a vibrator to form a mechanical vibration system. When the frequency of the excitation force generated by the vibrator is consistent with the natural frequency of the system, the system resonates. At this time, a small power input can generate a large-scale alternating load on the specimen. Among them, electromagnetic high-frequency fatigue testing machines are suitable for high-stiffness materials (such as metals).

[0003] Problems with existing technology: Limitations of manual frequency adjustment: In electromagnetic high-frequency fatigue testing machines, it is necessary to match the resonance point by changing the counterweight or adjusting the spring preload, which is cumbersome and relies on experience. Frequency drift caused by cracks: When a crack occurs in the sample, the resonance point will shift, which will directly lead to amplitude instability and directly affect the test process and test results. In addition, the generation of cracks can also cause the sample to break. Sudden sample breakage under resonance may cause the system energy release to run out of control, damaging the sensor or fixture. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-purpose high-frequency fatigue testing machine that can replace manual adjustment of counterweights, achieve quick and convenient operation, and detect cracked plates in a timely manner during the test, so as to stop the test in time before the sample breaks.

[0005] The specific technical solution adopted by this invention is as follows: A multi-purpose high-frequency fatigue testing machine includes a main control device and a fatigue testing machine. The fatigue testing machine includes a base and an electromagnetic high-frequency generator body. A counterweight platform is assembled directly below the electromagnetic high-frequency generator body via a connecting rod. Fixture assemblies are assembled on the surface of the base and the lower surface of the counterweight platform. Counterweights, several counterweights are stacked in an adjustable manner on the surface of the counterweight platform, and are used to match the resonance point by changing the counterweights; The plate clamp, which is detachably assembled with the clamp assembly, is used to detect cracks in the sample that occur during the test.

[0006] The electromagnetic high-frequency generator body is mounted in a lifting manner on top of the base unit. The two sides inside the base unit are equipped with solenoids that rotate through a drive mechanism. The two sides below the electromagnetic high-frequency generator body are fixedly mounted with screws that are screwed to the corresponding solenoids. The two sides of the surface of the base unit are fixedly mounted with guide rods for guiding the electromagnetic high-frequency generator body to move up and down.

[0007] The top of the screw is integrally provided with a straight rod section, and the outer surface of the straight rod section is movably fitted with a sleeve. Cylinders are fixedly installed on both sides of the bottom of the electromagnetic high-frequency generator body, and the extension and retraction output ends of the cylinders are connected to the corresponding sleeves.

[0008] Both inner sides of the two sleeves facing each other are hinged with Z-shaped hook frames, and a central through groove is provided in the middle of the Z-shaped hook frame. Limiting blocks for limiting the rotation range of the Z-shaped hook frame are integrally provided at both ends of the side wall of the sleeve. An electromagnet is fixedly installed on the top of the sleeve near the Z-shaped hook frame. The top of the outer walls on both sides of the counterweight platform are integrally provided with auxiliary blocks.

[0009] The counterweight has a through hole for the connecting rod to pass through. The counterweight has side grooves on both sides of its edge, and a side groove block is embedded in the side groove. The outer wall of the side groove block is integrally provided with a convex shell, and a centering groove is provided in the middle of the convex shell.

[0010] Both sides of the middle part of the counterweight have through openings. The upper and lower surfaces of the counterweight are symmetrically fitted with sliding mountain-shaped connecting frames. The two mountain-shaped connecting frames in the same direction are connected by a connecting body through the through opening. The mountain-shaped connecting frames on both sides are connected by a spring located inside the through opening. The support end of the mountain-shaped connecting frame located in the through hole is connected to a friction block. The friction force of the friction block when it is in close contact with the connecting rod is used to limit the relative movement between the counterweight and the connecting rod. The support ends of the two mountain-shaped connecting frames in the same direction located in the side groove are connected to a through block.

[0011] The through block can pass through the corresponding side groove block. The upper and lower surfaces of the through block are integrally provided with an outer plate and an inner plate, respectively. The inner plate is placed below the inner side of the outer plate, and both the inner plate and the outer plate pass through the central groove. When the Z-shaped hook catches the convex shell and pre-drives the corresponding counterweight to move upward, the through block is squeezed by the Z-shaped hook and drives the mountain-shaped connecting frame to move inward.

[0012] The plate clamp includes a base and a lifting seat, which are telescopically assembled. The surface of the base away from the lifting seat is integrally provided with an end post for clamping by the clamping assembly. Bolt holes are fixedly provided on both sides of the surface of the base, and bolts that are screwed into the corresponding bolt holes are inserted into both sides inside the lifting seat.

[0013] The base surface is symmetrically and slidably assembled with wedge blocks on both sides. The inner wall of the chamber through which the wedge blocks pass is set as an inclined section. The outer wall inclined surface of the wedge block is in extrusion contact with the corresponding inclined section. Clamping blocks are arranged in an array on the inner side of both wedge blocks.

[0014] The inner wall of the wedge-shaped block is arrayed with micro-cavities. One side of the clamping block is integrally provided with an inner body, which is slidably assembled inside the corresponding micro-cavity. A spring is connected between the top of the inner body and the inner wall of the micro-cavity. An oil cavity is provided inside the inner body. A fixed oil plug is fixedly installed inside each micro-cavity. The fixed oil plug is inserted into the corresponding oil cavity. The bottom of each inner body is connected to a branch pipe. The ends of the branch pipes at the bottoms of the two inner bodies located inside the two wedge-shaped blocks and arranged opposite each other are connected to an oil pipe.

[0015] A measuring box is fixedly installed on the outer wall of the base edge. The measuring box contains a chip board and hydraulic pipes. The hydraulic pipes are arranged in an array. The end of each hydraulic pipe is connected to a corresponding hydraulic pipe. A live oil plug is telescopically assembled inside the end of each hydraulic pipe away from the pipe. A pressure sensor is embedded in the end of the live oil plug located inside the hydraulic pipe.

[0016] The technical effects achieved by this invention are as follows: In this invention, a liftable and movable sleeve, in conjunction with specially designed counterweights, allows for flexible changes in the number of counterweights placed directly on the counterweight platform, thereby achieving the effect of adjusting the counterweight. This changes the traditional electromagnetic resonance structure, which requires manual replacement of counterweights to match the resonance point, enabling quick and convenient operation.

[0017] The plate clamp designed in this invention, while ensuring normal plate clamping function, can also detect cracked plates in a timely manner during the test. By detecting the instantaneous change in oil pressure in the corresponding channel, it can detect the unexpected cracking of the test plate, thereby stopping the test in time before the sample breaks, avoiding the possibility of uncontrolled energy release in the system caused by sample breakage, which could damage the sensor or clamp. At the same time, it can prevent the resonance point from shifting due to sample cracking, ensuring the accuracy of the test results. Attached Figure Description

[0018] Figure 1 This is an integrated structural diagram of the testing machine provided in an embodiment of the present invention; Figure 2 This is a front view structural diagram of the fatigue testing machine provided in an embodiment of the present invention; Figure 3 This is a diagram showing the loading structure of the counterweight provided in an embodiment of the present invention; Figure 4 This is a structural disassembly diagram of a single counterweight provided in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the combination variations of the sleeve and the side groove block provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the assembly process of the sleeve and the side groove block provided in an embodiment of the present invention; Figure 7 This is a structural diagram of two plate clamps provided in an embodiment of the present invention; Figure 8 This is an anatomical view of the sheet metal clamp provided in an embodiment of the present invention; Figure 9 This is a cross-sectional view of the base provided in an embodiment of the present invention; Figure 10 yes Figure 9 A magnified view of the structure at point A in the middle; Figure 11 yes Figure 9 A magnified view of the structure at point B in the middle section.

[0019] The attached diagram lists the components represented by each number as follows: 1. Main control equipment; 2. Fatigue testing machine; 201. Base unit; 202. Screw tube; 203. Screw; 204. Straight rod section; 205. Electromagnetic high-frequency generator body; 206. Guide rod; 207. Connecting rod; 208. Counterweight platform; 209. Fixture assembly; 210. Cylinder; 211. Sleeve; 212. Z-shaped hook frame; 213. Through slot; 214. Limiting block; 215. Electromagnet; 216. Auxiliary block; 3. Counterweight; 301. Side groove; 302. Perforation; 303. Through-hole; 304. Mountain-shaped connecting frame; 305. Spring 1; 306. Friction block; 307. Through-block; 308. Outer plate; 309. Inner plate; 310. Side groove block; 311. Convex shell; 312. Centering groove; 4. Sheet metal clamp; 401. Base; 402. Lifting seat; 403. Wedge block; 404. Inclined section; 405. Bolt; 406. Bolt hole; 407. Clamping block; 408. Micro-cavity; 409. Internal body; 410. Oil cavity; 411. Spring 2; 412. Fixed oil plug; 413. Oil pipe; 414. Measuring box; 415. Chip board; 416. Hydraulic pipe; 417. Live oil plug; 418. Pressure sensor; 419. End post. Detailed Implementation

[0020] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0021] like Figures 1-11 As shown, a multi-purpose high-frequency fatigue testing machine includes a main control device 1 and a fatigue testing machine 2. The fatigue testing machine 2 includes a base 201 and an electromagnetic high-frequency generator body 205. A counterweight platform 208 is connected and assembled directly below the electromagnetic high-frequency generator body 205 via a connecting rod 207. Fixture assemblies 209 are assembled on the surface of the base 201 and the lower surface of the counterweight platform 208. The electromagnetic high-frequency generator body 205 is mounted in a lifting manner directly above the base 201. Screw tubes 202 are rotatably assembled on both sides inside the base 201 via a drive mechanism. Screws 203 are fixedly assembled on both sides below the electromagnetic high-frequency generator body 205, and the screws 203 are screwed to the corresponding screw tubes 202. Guide rods 206 for guiding the electromagnetic high-frequency generator body 205 to rise and fall are fixedly assembled on both sides of the surface of the base 201.

[0022] According to the above structure, the part to be tested or other fixtures can be directly clamped by the clamping assembly 209. The solenoid 202 is driven to rotate by the drive mechanism. By means of the screw connection between the screw 203 and the solenoid 202, the electromagnetic high-frequency generator body 205 is controlled to move up and down. The electromagnetic high-frequency generator body 205 generates a high-frequency load, which is applied to the part to be tested below through the connecting rod 207 and the counterweight 208, so as to achieve efficient testing of the fatigue performance of the part. The above process is all existing technology and will not be described in detail here.

[0023] Example 1: See attached document Figures 2-3 , Figures 5-6 The top of the screw 203 is integrally provided with a straight rod section 204, and the outer surface of the straight rod section 204 is movably fitted with a sleeve 211. Cylinders 210 are fixedly installed on both sides of the bottom of the electromagnetic high-frequency generator body 205, and the telescopic output end of the cylinder 210 is connected to the corresponding sleeve 211. Z-shaped hook frames 212 are hinged to the inner sides of the two sleeves 211 facing each other, and a through groove 213 is opened in the middle of the Z-shaped hook frame 212. Limiting blocks 214 for limiting the rotation range of the Z-shaped hook frame 212 are integrally provided at both ends of the side wall of the sleeve 211. An electromagnet 215 is fixedly installed on the top of the side of the sleeve 211 near the Z-shaped hook frame 212. An auxiliary block 216 is integrally provided on the top of the outer walls on both sides of the counterweight platform 208.

[0024] According to the above structure, during the counterweight adjustment, the sleeve 211 is raised and lowered by the cylinder 210 to change the counterweight borne by the counterweight platform 208.

[0025] The counterweight 3, several counterweights 3 are adjustablely stacked on the surface of the counterweight platform 208, and are used to match the resonance point by changing the counterweights; See attached document Figure 4The counterweight 3 has a through hole 302 for the connecting rod 207 to pass through. The counterweight 3 has a side groove 301 on both sides of its edge, and a side groove block 310 is embedded in the side groove 301. The outer wall of the side groove block 310 is integrally provided with a convex shell 311, and a centering groove 312 is provided in the middle of the convex shell 311. See attached document Figure 4 Both sides of the middle of the counterweight 3 have through openings 303. The upper and lower surfaces of the counterweight 3 are symmetrically fitted with sliding mountain-shaped connecting frames 304. The two mountain-shaped connecting frames 304 in the same direction are connected by a connecting body through the through openings 303. The mountain-shaped connecting frames 304 on both sides are connected by a spring 305 inside the through openings 303. The support end of the mountain-shaped connecting frame 304 located in the through hole 302 is connected to a friction block 306. The friction force of the friction block 306 when it is in close contact with the connecting rod 207 is used to limit the relative movement between the counterweight 3 and the connecting rod 207. The support ends of the two mountain-shaped connecting frames 304 in the same direction located in the side groove 301 are connected to the through block 307. See attached document Figure 4 The through block 307 moves through the corresponding side groove block 310. The upper and lower surfaces of the through block 307 are respectively integrally provided with an outer plate 308 and an inner plate 309. The inner plate 309 is placed below the inner side of the outer plate 308, and both the inner plate 309 and the outer plate 308 pass through the central groove 312. See attached document Figures 5-6 When the Z-shaped hook 212 hooks the convex shell 311 and pre-drives the corresponding counterweight 3 to move upward, the through block 307 is squeezed by the Z-shaped hook 212 and drives the mountain-shaped connecting frame 304 to move inward.

[0026] Based on the above structure, the counterweight adjustment is achieved by changing the number of counterweights 3 placed directly on the counterweight platform 208. The specific process is as follows: when it is necessary to carry a certain counterweight 3 away from the surface of the counterweight platform 208, the control cylinder 210 moves the sleeve 211 to below the counterweight 3. When the Z-shaped hook frame 212 passes the side groove block 310 at the edge of the counterweight 3, it will temporarily rotate and tilt due to the obstruction. (See attached diagram) Figure 6 As shown, after the Z-shaped hook frame 212 rotates and resets, the sleeve 211 is controlled to start moving upward. When the Z-shaped hook frame 212 hooks the convex shell 311 and pre-drives the corresponding counterweight 3 upward, the through block 307 is squeezed by the Z-shaped hook frame 212 and drives the mountain-shaped connecting frame 304 to move inward, as shown in the attached figure. Figure 5 As shown, at this time, the mountain-shaped connecting frame 304 on both sides of the counterweight 3 will move towards the center, the spring 305 will be compressed and the friction block 306 will leave the corresponding through hole 302. Since the through hole 302 leaves the connecting rod 207 at this time, the counterweight 3 can be easily moved upward by the sleeve 211, thereby reducing the number of counterweights 3 placed directly on the counterweight platform 208. When it is necessary to carry two or more counterweights 3 upwards, simply control the sleeve 211 to move to the bottom of the corresponding lowest counterweight 3. When the through blocks 307 on both sides of the lowest counterweight 3 are squeezed and moved, the outer plate 308 on the surface of the through block 307 will squeeze the inner plate 309 above it, driving the upper through block 307 to move synchronously towards the center. All counterweights 3 located above the counterweight 3 can be moved upwards. When it is necessary to control the sleeve 211 to move upward without carrying any counterweight 3, simply control the sleeve 211 to move below the auxiliary block 216. With the help of the block 216, the Z-shaped hook frame 212 rotates and approaches the electromagnet 215. At this time, the electromagnet 215 is energized, and the Z-shaped hook frame 212 maintains the tilting angle. Finally, control the sleeve 211 to move upward. In the above process, the movable sleeve 211, in conjunction with the specially designed counterweight 3, can flexibly change the number of counterweights 3 placed directly on the counterweight platform 208, thereby achieving the effect of adjusting the counterweight. This changes the traditional electromagnetic resonance structure, which requires manual replacement of counterweights to match the resonance point, and enables quick and convenient operation.

[0027] The working principle of this invention is as follows: During the counterweight adjustment process, the sleeve 211 is raised and lowered by the cylinder 210. When it is necessary to carry a certain counterweight 3 away from the surface of the counterweight platform 208, the cylinder 210 is controlled to move the sleeve 211 below the counterweight 3. When the Z-shaped hook frame 212 passes the edge groove block 310 of the counterweight 3, it will temporarily rotate and tilt due to the obstruction, as shown in the attached figure. Figure 6 As shown, after the Z-shaped hook frame 212 rotates and resets, the sleeve 211 is controlled to start moving upward. When the Z-shaped hook frame 212 hooks the convex shell 311 and pre-drives the corresponding counterweight 3 upward, the through block 307 is squeezed by the Z-shaped hook frame 212 and drives the mountain-shaped connecting frame 304 to move inward, as shown in the attached figure. Figure 5 As shown, at this time, the mountain-shaped connecting frames 304 on both sides of the counterweight 3 will move towards the center, the spring 305 will be compressed and the friction block 306 will leave the corresponding through hole 302. Since the through hole 302 is away from the connecting rod 207 at this time, the counterweight 3 can be easily moved upward by the sleeve 211, thereby reducing the number of counterweights 3 directly placed on the counterweight platform 208, making it easier to replace the counterweight matching resonance point and achieve the purpose of replacing manual adjustment.

[0028] Example 2: The plate clamp 4, together with the clamp assembly 209, forms a detachable assembly and is used to detect cracks in the sample that occur during the test.

[0029] See attached document Figures 7-8The plate clamp 4 includes a base 401 and a lifting seat 402. The base 401 and the lifting seat 402 form a telescopic assembly. The surface of the base 401 away from the lifting seat 402 is integrally provided with an end post 419 for connecting with the clamp assembly 209. Both sides of the surface of the base 401 are fixedly provided with bolt holes 406. The two sides inside the lifting seat 402 are inserted with bolts 405 that are screwed into the corresponding bolt holes 406. See attached document Figures 8-11 The base 401 has wedge blocks 403 symmetrically slidably assembled on both sides of its surface. The inner wall of the chamber through which the wedge blocks 403 pass through the lifting seat 402 is set as an inclined section 404. The inclined surface of the outer wall of the wedge block 403 is in contact with the corresponding inclined section 404. Clamping blocks 407 are arrayed on the inner sides of the two wedge blocks 403. According to the above structure, when using the plate clamp 4 to clamp the plate material, the plate to be tested is placed inside the upper and lower sets of wedge blocks 403. Then, the bolts 405 are tightened with a wrench, and the base 401 and the lifting seat 402 will retract. The outer wall of the wedge block 403 will make squeezing contact with the corresponding inclined section 404. As the retraction movement proceeds, the two wedge blocks 403 will move closer and closer together, and the clamping block 407 will achieve the effect of clamping the plate.

[0030] See attached document Figures 8-11 The inner wall of the wedge block 403 is provided with arrayed micro-cavities 408. One side of the clamping block 407 is integrally provided with a built-in body 409, and the built-in body 409 is slidably assembled inside the corresponding micro-cavity 408. A spring 411 is connected between the top of the built-in body 409 and the inner wall of the micro-cavity 408. An oil cavity 410 is provided inside the built-in body 409. A fixed oil plug 412 is fixedly installed inside the micro-cavity 408. The fixed oil plug 412 is inserted into the corresponding oil cavity 410. The bottom of each built-in body 409 is connected to a branch pipe. The ends of the branch pipes at the bottoms of the two built-in bodies 409 located inside the two wedge blocks 403 and arranged opposite each other are connected to an oil pipe 413. See attached document Figures 8-11 A measuring box 414 is fixedly installed on the outer wall of the base 401. Inside the measuring box 414, there is a chip board 415 and a hydraulic pipe 416. The hydraulic pipes 416 are arranged in an array. The end of the oil pipe 413 is connected to the corresponding hydraulic pipe 416. A live oil plug 417 is telescopically assembled inside the end of the hydraulic pipe 416 away from the oil pipe 413. A pressure sensor 418 is embedded in the end of the live oil plug 417 inside the hydraulic pipe 416. A data cable interface is provided on the outer wall of the measuring box 414. The data cable interface is connected to the main control device 1 through a data cable.

[0031] According to the above structure, before the fatigue test, the clamped plate is raised a short distance by controlling the electromagnetic high-frequency generator 205, causing the inner body 409 inside the clamping block 407 to move to the limit position of the micro-cavity 408, and the second spring 411 is compressed to its limit. Then, a high-frequency fatigue test is performed. During the test, without plate breakage, the oil pressure changes in each oil cavity 410 are the same. However, when the plate unexpectedly breaks, since most cracks start from the edge of the plate, the clamping force of the clamping block 407 at the edge changes instantly upon crack occurrence. The inner body 409 at that point moves slightly under the elastic force of the second spring 411, and the oil pressure in that oil cavity 410... When a slight change occurs in the oil pressure, the pressure sensor 418 in the oil pressure pipe 416 connected to the oil chamber 410 can detect this instantaneous change. When the change is detected by the main control device 1, the device immediately triggers the emergency stop protection mechanism. In the above process, the plate clamp 4 can not only ensure the normal plate clamping function, but also detect the plate with cracks in time during the test. By detecting the instantaneous change in oil pressure in the corresponding channel, the test plate is detected to have unexpectedly cracked. This allows the test to be stopped in time before the sample breaks, avoiding the possibility of uncontrolled energy release in the system caused by sample breakage, which could damage the sensor or clamp. At the same time, it prevents the resonance point from shifting due to sample cracks, ensuring the accuracy of the test results.

[0032] The working principle of this invention is as follows: The plate to be tested is placed inside the upper and lower sets of wedge blocks 403. Then, the bolts 405 are tightened with a wrench, and the plate is clamped by the clamping block 407. Then, the electromagnetic high-frequency generator 205 is raised a short distance, so that the built-in body 409 inside the clamping block 407 moves to the limit position of the micro cavity 408, and the second spring 411 is compressed to the limit. Then, a high-frequency fatigue test is performed. During the test, when the plate breaks unexpectedly, since most cracks start from the edge of the plate, the clamping force of the clamping block 407 at the edge changes at the moment the crack occurs. The built-in body 409 at this point moves slightly under the elastic force of the second spring 411, and the oil pressure in the oil cavity 410 changes slightly. At this time, the pressure sensor 418 in the oil pressure pipe 416 connected to the oil cavity 410 can detect the instantaneous change. When the change is detected, it means that the test plate has cracked, and the equipment immediately triggers the emergency stop protection mechanism.

[0033] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A multi-purpose high-frequency fatigue testing machine, comprising a main control device (1) and a fatigue testing machine (2), the fatigue testing machine (2) comprising a base machine (201) and an electromagnetic high-frequency generator body (205), a counterweight platform (208) being assembled directly below the electromagnetic high-frequency generator body (205) via a connecting rod (207), and clamping assemblies (209) being assembled on the surface of the base machine (201) and the lower surface of the counterweight platform (208), characterized in that: The counterweights (3) are stacked in an adjustable manner on the surface of the counterweight platform (208) and are used to match the resonance point by changing the counterweights. Screws (203) are fixedly assembled on both sides below the electromagnetic high frequency generator body (205). A straight rod section (204) is integrally provided on the top of the screw (203), and a sleeve (211) is movably sleeved on the outer surface of the straight rod section (204). Z-shaped hooks (212) are hinged to the inner sides of the two sleeves (211) facing each other. The counterweight (3) has side grooves (301) on both sides of its edge, and a side groove block (310) is embedded in the side groove (301). The outer wall of the side groove block (310) is integrally provided with a convex shell (311), and a center groove (312) is provided in the middle of the convex shell (311). The counterweight (3) has mountain-shaped connecting frames (304) symmetrically embedded and slidably assembled on both sides of its upper and lower surfaces. The two mountain-shaped connecting frames (304) in the same direction are located at the support ends of the side groove (301) and are connected to a through block (307). The through block (307) movably passes through the corresponding side groove block (310). When the Z-shaped hook frame (212) hooks the convex shell (311) and pre-drives the corresponding counterweight (3) to move upward, the through block (307) is squeezed by the Z-shaped hook frame (212) and drives the mountain-shaped connecting frame (304) to move inward; The plate clamp (4) is detachably assembled with the clamp assembly (209) and is used to detect cracks generated in the sample during the test. The plate clamp (4) includes a base (401) and a lifting seat (402). Wedge blocks (403) are symmetrically slidably assembled on both sides of the surface of the base (401). Clamping blocks (407) are arrayed on the inner sides of the two wedge blocks (403). Micro-cavities (408) are arrayed on the inner wall of the wedge blocks (403). An integrated body (409) is integrally provided on one side of the clamping block (407). An oil cavity (410) is opened inside the integrated body (409). A fixed oil plug (412) is fixedly installed inside the micro-cavities (408). The fixed oil plug (412) is inserted into the corresponding oil cavity (410). A branch pipe is connected to the bottom of each integrated body (409).

2. The multi-purpose high-frequency fatigue testing machine according to claim 1, characterized in that: The electromagnetic high-frequency generator body (205) is mounted in a lifting manner directly above the base unit (201). The two sides inside the base unit (201) are equipped with solenoids (202) through a drive mechanism, and the screw (203) is screwed to the corresponding solenoid (202). The two sides of the surface of the base unit (201) are fixedly equipped with guide rods (206) for guiding the electromagnetic high-frequency generator body (205) to rise and fall.

3. The multi-purpose high-frequency fatigue testing machine according to claim 2, characterized in that: Both sides of the bottom of the electromagnetic high-frequency generator body (205) are fixedly installed with cylinders (210), and the extension and retraction output end of the cylinder (210) is connected to the corresponding sleeve (211). A central through groove (213) is provided in the middle of the Z-shaped hook frame (212). Limiting blocks (214) for limiting the rotation range of the Z-shaped hook frame (212) are integrally provided at both ends of the side wall of the sleeve (211). An electromagnet (215) is fixedly installed on the top of the sleeve (211) near the Z-shaped hook frame (212). The top of the outer walls on both sides of the counterweight platform (208) is integrally provided with auxiliary blocks (216).

4. The multi-purpose high-frequency fatigue testing machine according to claim 3, characterized in that: The counterweight (3) has a through hole (302) inside for the connecting rod (207) to pass through.

5. The multi-purpose high-frequency fatigue testing machine according to claim 4, characterized in that: The counterweight (3) has through openings (303) on both sides of the middle section. The two mountain-shaped connecting frames (304) in the same direction are connected by the connecting body through the through openings (303). The mountain-shaped connecting frames (304) on both sides are connected by a spring (305) inside the through opening (303). The support end of the mountain-shaped connecting frame (304) located in the through hole (302) is connected to a friction block (306). The friction force of the friction block (306) when it is in close contact with the connecting rod (207) is used to limit the relative movement between the counterweight (3) and the connecting rod (207).

6. The multi-purpose high-frequency fatigue testing machine according to claim 5, characterized in that: The upper and lower surfaces of the through block (307) are respectively integrally provided with an outer plate (308) and an inner plate (309). The inner plate (309) is located below the inner side of the outer plate (308), and both the inner plate (309) and the outer plate (308) pass through the central groove (312).

7. The multi-purpose high-frequency fatigue testing machine according to claim 1, characterized in that: The base (401) and the lifting seat (402) form a telescopic assembly. The surface of the base (401) away from the lifting seat (402) is integrally provided with an end post (419) for clamping by the clamping assembly (209). Both sides of the surface of the base (401) are fixedly provided with bolt holes (406). The two sides inside the lifting seat (402) are inserted with bolts (405) that are screwed into the corresponding bolt holes (406).

8. The multi-purpose high-frequency fatigue testing machine according to claim 7, characterized in that: The inner wall of the chamber through which the wedge block (403) passes in the lifting seat (402) is set as an inclined section (404), and the inclined surface of the outer wall of the wedge block (403) and the corresponding inclined section (404) are in extrusion contact.

9. The multi-purpose high-frequency fatigue testing machine according to claim 8, characterized in that: The built-in body (409) is slidably assembled inside the corresponding micro cavity (408). A spring (411) is connected between the top of the built-in body (409) and the inner wall of the micro cavity (408). The ends of the branch pipes at the bottom of the two built-in bodies (409) located inside the two wedge blocks (403) and arranged opposite to each other are connected to an oil pipe (413).

10. The multi-purpose high-frequency fatigue testing machine according to claim 9, characterized in that: A measuring box (414) is fixedly installed on the outer wall of the base (401). The measuring box (414) contains a chip board (415) and a hydraulic tube (416). The hydraulic tubes (416) are arranged in an array. The end of the oil pipe (413) is connected to the corresponding hydraulic tube (416). A live oil plug (417) is telescopically assembled inside the end of the hydraulic tube (416) away from the oil pipe (413). A pressure sensor (418) is embedded in the end of the live oil plug (417) inside the hydraulic tube (416).

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