A pre-twisted backup drainage line clamp and line fatigue testing machine

Abstract

The present invention relates to a pre-twisted backup drainage wire clamp and wire protection line fatigue testing machine. It solves the problem in the prior art that the state detection of pre-twisted wire protection lines cannot effectively simulate complex real stress conditions and is difficult to accurately evaluate their durability and reliability. It includes an assembly stand, one end of the assembly stand is connected to a crank distance adjustment mechanism through a driving mechanism, the crank distance adjustment mechanism is connected to a sliding component slidably arranged at the other end of the assembly stand through a linkage connecting rod, and a clamping mechanism for clamping the pre-twisted wire protection line is provided between the sliding components, and the crank distance adjustment mechanism is provided with an elastic support structure for supporting one end of the linkage connecting rod. The advantages of the present invention are: it can accurately simulate a variety of real working conditions and achieve efficient detection; it has a simple structure and is easy to operate, and can provide a scientific basis for the design optimization and life prediction of pre-twisted wire protection lines, and has important engineering application value.

Description

Technical Field

[0001] The invention relates to the technical field of tensile testing, and in particular to a pre-twisted backup drainage wire clamp guard wire along-line fatigue testing machine. Background Art

[0002] Pre-twisted wire armor bars are a type of specialized hardware used in power transmission lines. They are primarily used for mechanical reinforcement of conductor connection points and for optimizing current distribution. Through dual mechanical and electrical optimization, they ensure the safe and efficient operation of the power grid, making them particularly suitable for high-load, long-span transmission scenarios. During the pre-twisted wire production process, the pre-twisted wires need to be tensile tested, and a tensile test bench is required for this test. However, the length of specimens that can be tested on existing tensile test benches is difficult to meet the maximum length and tensile force required for use. In addition, existing pre-twisted wire armor bar status detection cannot effectively simulate complex real-world stress conditions, making it difficult to accurately assess their durability and reliability.

[0003] To address the shortcomings of existing technologies, researchers have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a test fixture for testing semiconductor cooling and heating chambers [CN202023291957.6]. The fixture includes a test bench frame, a position adjustment seat, and a hydraulic cylinder mounted on the test bench frame. The test bench frame is supported on the ground by legs, and a plurality of latch holes are provided along the length of the test bench frame. The position adjustment seat is mounted on the test bench frame and fixedly connected to the test bench frame using latches. A tension sensor and a connector are fixedly mounted on the inner end of the position adjustment seat. The hydraulic cylinder is fixed to one end of the test bench frame, and a connector is fixed to the telescopic end of the hydraulic cylinder. The fixture also includes a control system.

[0004] The above solution has solved to a certain extent the problem in the existing technology that pre-twisted wire detection is difficult to meet the maximum length and tension value used, but the solution still has many shortcomings, such as: it cannot effectively simulate complex real-world stress conditions and it is difficult to accurately evaluate its durability and reliability. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a pre-twisted backup drainage line clamp and line fatigue testing machine.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a pre-twisted backup drainage wire clamp and protective wire line fatigue testing machine, comprising an assembly stand, one end of the assembly stand is connected to a crank distance adjustment mechanism through a driving mechanism, the crank distance adjustment mechanism is connected to a sliding component slidably arranged at the other end of the assembly stand through a linkage connecting rod, and a clamping mechanism for clamping the pre-twisted wire protective wire is provided between the sliding components, and the crank distance adjustment mechanism is provided with an elastic support structure for supporting one end of the linkage connecting rod.

[0007] In the above-mentioned pre-twisted backup drain line clamp and line fatigue testing machine, the sliding assembly includes a connecting slide rail symmetrically arranged on the assembly stand, a sliding connecting seat is provided on the connecting slide rail, and a connecting pedestal is fixedly installed on the upper end of the sliding connecting seat. The clamping mechanism is positioned between the connecting pedestals, and a first rotating connecting shaft is provided on one of the connecting pedestals, and one end of the linkage rod is rotatably connected to the first rotating connecting shaft.

[0008] In the above-mentioned pre-twisted backup drain line clamp and guard line along-line fatigue testing machine, a second rotating connecting shaft is provided on the crank pitch adjustment mechanism, and the second rotating connecting shaft is rotatably connected to the other end of the linkage connecting rod.

[0009] In the above-mentioned pre-twisted backup drainage line clamp and line fatigue testing machine, the crank distance adjustment mechanism includes a crank rotating disk arranged in a ring shape, a rotating linkage disk body is provided on the inner side of the crank rotating disk in the circumferential direction, and a number of symmetrically arranged connecting rods are respectively provided between the rotating linkage disk body and the circumference of the crank rotating disk, and one of the connecting rods is axially provided with a strip-shaped adjustment groove, and the second rotating connecting shaft is adjustably arranged in the strip-shaped adjustment groove.

[0010] In the above-mentioned pre-twisted backup drainage line clamp and line fatigue testing machine, the elastic support structure includes an adjusting cylinder arranged on a crank rotating disk, the output end of the adjusting cylinder is connected to the second rotating connecting shaft and drives the second rotating connecting shaft to move and adjust the positioning position in the strip-shaped adjustment groove, and a plurality of fixed adjustment holes arranged at equal distances are provided on the connecting support rod symmetrical to the connecting support rod with the strip-shaped adjustment groove, and an elastic positioning connecting rod is connected to the fixed adjustment hole through a connecting rod, and the end of the elastic positioning connecting rod away from the connecting rod is connected to the second rotating connecting shaft.

[0011] In the above-mentioned pre-twisted backup drainage line clamp and line fatigue testing machine, a symmetrically arranged strip slide is provided on the connecting support rod, a sliding connecting shaft is slidingly provided in the strip slide, and a first arc-shaped telescopic rod is connected to the sliding connecting shaft, and the end of the first arc-shaped telescopic rod away from the sliding connecting shaft is connected to a second arc-shaped telescopic rod through a connecting rotating shaft, and the end of the second arc-shaped telescopic rod away from the connecting rotating shaft is connected to the second rotating connecting shaft.

[0012] In the above-mentioned pre-twisted backup drainage line clamp and wire line fatigue testing machine, elastic positioning connectors are connected on both sides of the assembly platform through positioning screws, and the end of the elastic positioning connector away from the positioning screw is connected to the connecting shaft, and the second arc-shaped telescopic rods located on both sides of the assembly platform are plugged and connected at one end away from the connecting shaft, and a clearance through hole for inserting the second rotating connecting shaft is provided at the overlapping part.

[0013] In the above-mentioned pre-twisted backup drainage wire clamping and guard wire line fatigue testing machine, the clamping mechanism includes a clamping seat arranged between two connecting platforms and fixedly connected to the connecting platforms at both ends. The clamping seat is connected to a clamping frame through a fixed screw, and an annular clamping gap for clamping the pre-twisted wire guard wire is formed between the clamping frame and the clamping seat.

[0014] In the above-mentioned pre-twisted backup drainage line clamping line fatigue testing machine, the clamping seat and the clamping frame are provided with symmetrically arranged arc-shaped clamping parts on the inner side of the circumference. The outer wall of the arc-shaped clamping part is connected to the inner wall of the clamping seat and the clamping frame through a number of top pressure springs, and a buffer gap is formed between the arc-shaped clamping part and the clamping seat or the clamping frame. A top pressure limiting part is provided in the buffer gap and between two adjacent top pressure springs. The top pressure limiting part can be adjusted and positioned by an adjusting screw passed through the clamping seat or the clamping frame.

[0015] In the above-mentioned pre-twisted backup drainage line clamp and line fatigue testing machine, telescopic clamping extensions are provided at the upper and lower ends of the clamping seat and the clamping frame, and a plug-in adjustment portion is provided at the bottom of the telescopic clamping extension. The plug-in adjustment portion can be adjustably plugged into the corresponding clamping seat or clamping frame, and the plug-in adjustment portions on the upper and lower sides are plugged in and connected, and a number of adjustment holes are correspondingly provided on the plug-in adjustment portion. The clamping seat and the clamping frame are provided with locking screws for plugging into the adjustment holes to position the plug-in adjustment portion; the driving mechanism includes a rotating drive motor arranged on the assembly stand, the output end of the rotating drive motor is connected to the axis of the crank pitch adjustment mechanism and drives the crank pitch adjustment mechanism to rotate, thereby driving the linkage connecting rod to drive the sliding assembly to slide on the assembly stand, and a reduction motor is provided at the output end of the rotating drive motor.

[0016] Compared with existing technologies, the present invention offers advantages in that it effectively simulates the swinging conditions of pre-twisted wire armor strips during actual operation, applying cyclic loads to the strips and enabling rapid assessment of their durability and reliability. By varying the height of the second rotating connecting shaft and the speed of the rotary drive motor, it accurately simulates real-world operating conditions and enables efficient testing. The device, with its simple structure and easy operation, provides a scientific basis for design optimization and lifespan prediction of pre-twisted wire armor strips, possessing significant engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Schematic diagram of the crank pitch adjustment mechanism in the present invention;

[0019] Figure 3 It is a schematic diagram of the elastic support structure in the present invention;

[0020] Figure 4 is a schematic diagram of the clamping mechanism in the present invention;

[0021] Figure 5 is a cross-sectional view of the clamping frame of the present invention;

[0022] In the figure: assembly platform 1, driving mechanism 2, rotation driving motor 21, reduction motor 22, crank pitch adjustment mechanism 3, crank rotating disk 31, rotating linkage disk body 32, connecting support rod 33, strip adjustment slot 34, linkage connecting rod 4, sliding assembly 5, connecting slide rail 51, sliding connecting seat 52, connecting seat 53, first rotating connecting shaft 54, second rotating connecting shaft 55, clamping mechanism 6, clamping seat 61, fixing screw 62, clamping frame 63, annular clamping gap 64, arc-shaped pressing portion 65 , top pressure spring 651, buffer gap 652, top pressure limit part 653, adjusting screw 654, telescopic clamping extension part 66, plug-in adjustment part 661, adjustment hole 662, locking screw 663, elastic support structure 7, adjusting cylinder 71, elastic positioning connector 72, fixed adjustment hole 73, connecting rod 74, elastic positioning connecting rod 75, strip slide groove 76, sliding connecting shaft 77, arc-shaped telescopic rod 78, connecting shaft 781, second arc-shaped telescopic rod 782, and give way through hole 783. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-5 As shown, a pre-twisted backup drainage wire clamp and protective wire line fatigue testing machine includes an assembly platform 1, one end of the assembly platform 1 is connected to a crank distance adjustment mechanism 3 through a driving mechanism 2, the crank distance adjustment mechanism 3 is connected to a sliding component 5 slidably arranged at the other end of the assembly platform 1 through a linkage connecting rod 4, and a clamping mechanism 6 for clamping the pre-twisted wire protective wire is provided between the sliding components 5, and an elastic support structure 7 for supporting one end of the linkage connecting rod 4 is provided on the crank distance adjustment mechanism 3.

[0025] Among them, the sliding assembly 5 includes a connecting slide rail 51 symmetrically arranged on the assembly stand 1, a sliding connecting seat 52 is provided on the connecting slide rail 51, and a connecting base 53 is fixedly installed on the upper end of the sliding connecting base 52, the clamping mechanism 6 is positioned between the connecting bases 53, and one of the connecting bases 53 is provided with a first rotating connecting shaft 54, and one end of the linkage link 4 is rotatably connected to the first rotating connecting shaft 54.

[0026] The sliding assembly 5 is used to drive the clamping mechanism 6 to slide in conjunction with each other, thereby simulating the swing of the clamped pre-twisted wire protection bar.

[0027] It can be seen that the crank pitch adjustment mechanism 3 is provided with a second rotation connecting shaft 55 , and the second rotation connecting shaft 55 is rotationally connected to the other end of the linkage connecting rod 4 .

[0028] Obviously, the crank pitch adjustment mechanism 3 includes a crank rotating disk 31 arranged in an annular shape, a rotating linkage disk body 32 is provided on the circumferential inner side of the crank rotating disk 31, and a number of symmetrically arranged connecting rods 33 are provided between the rotating linkage disk body 32 and the crank rotating disk 31 in the circumferential direction, and a strip-shaped adjustment groove 34 is axially provided on one of the connecting rods 33, and the second rotating connecting shaft 55 is adjustably arranged in the strip-shaped adjustment groove 34.

[0029] When the crank rotating disk 31 rotates, the rotational motion is converted into reciprocating linear motion of the sliding component 5 on the assembly stand 1. By changing the height position of the second rotating connecting shaft 55 in the strip-shaped adjustment slot 34, the pulling length of the linkage link 4 on the sliding component 5 is changed, thereby simulating the working condition of swing fatigue.

[0030] Furthermore, the elastic support structure 7 includes an adjusting cylinder 71 arranged on the crank rotating disk 31, the output end of the adjusting cylinder 71 is connected to the second rotating connecting shaft 55 and drives the second rotating connecting shaft 55 to move the adjustment positioning position in the bar-shaped adjustment groove 34, and a plurality of fixed adjustment holes 73 equidistantly arranged are provided on the connecting support rod 33 symmetrical to the connecting support rod 33 having the bar-shaped adjustment groove 34, and an elastic positioning connecting rod 75 is connected to the fixed adjustment hole 73 through the connecting rod 74, and the end of the elastic positioning connecting rod 75 away from the connecting rod 74 is connected to the second rotating connecting shaft 55.

[0031] The elastic support structure 7 adjusts the swing amplitude in real time and absorbs vibration energy, that is, the position of the second rotating connecting shaft 55 is adjusted by adjusting the cylinder 71. The elastic positioning link 75 is a retractable elastic structure. When the crank rotating disk 31 rotates, the elastic positioning link 75 absorbs vibration energy to ensure the sliding stability of the sliding component 5.

[0032] Furthermore, the connecting support rod 33 is provided with a symmetrically arranged strip slide groove 76, a sliding connecting shaft 77 is slidably provided in the strip slide groove 76, and the sliding connecting shaft 77 is connected to a first arc-shaped telescopic rod 78 arranged in an arc shape, and the end of the first arc-shaped telescopic rod 78 away from the sliding connecting shaft 77 is connected to a second arc-shaped telescopic rod 782 arranged in an arc shape through a connecting rotating shaft 781, and the end of the second arc-shaped telescopic rod 782 away from the connecting rotating shaft 781 is connected to the second rotating connecting shaft 55.

[0033] Specifically, elastic positioning connectors 72 are connected to both sides of the assembly stand 1 through positioning screws, and the end of the elastic positioning connector 72 away from the positioning screw is connected to the connecting shaft 781, and the second arc-shaped telescopic rods 782 located on both sides of the assembly stand 1 are plugged and connected at the ends away from the connecting shaft 781, and a clearance hole 783 for inserting the second rotating connecting shaft 55 is provided at the overlapping part.

[0034] The setting of the sliding connecting shaft 77 and the elastic positioning connecting member 72 can change the support angle between the second arc-shaped telescopic rod 782 and the first arc-shaped telescopic rod 78. The second rotating connecting shaft 55 can provide the same support force regardless of its height position, ensuring the elastic stability when one end of the linkage link 4 rotates.

[0035] More specifically, the clamping mechanism 6 includes a clamping seat 61 arranged between two connecting seats 53 and fixedly connected to the connecting seats 53 at both ends. The clamping seat 61 is connected to a clamping frame 63 through a fixing screw 62, and an annular clamping gap 64 for clamping the pre-twisted wire protective strip is formed between the clamping frame 63 and the clamping seat 61.

[0036] In detail, the clamping seat 61 and the clamping frame 63 are symmetrically provided with an arc-shaped clamping portion 65 on the inner side of the circumference. The outer wall of the arc-shaped clamping portion 65 is connected to the inner wall of the clamping seat 61 and the clamping frame 63 through a number of top pressure springs 651, and a buffer gap 652 is formed between the arc-shaped clamping portion 65 and the clamping seat 61 or the clamping frame 63. A top pressure limiting portion 653 is provided in the buffer gap 652 and between two adjacent top pressure springs 651. The top pressure limiting portion 653 can be adjusted and positioned by an adjusting screw 654 passed through the clamping seat 61 or the clamping frame 63.

[0037] The arc-shaped pressing portion 65 can be adapted to various diameters of pre-twisted wire protection strips, providing close clamping, and by adjusting the position of the top pressure limiter 653 , the movable stroke of the pre-twisted wire protection strip can be fixed.

[0038] Preferably, telescopic clamping extensions 66 are provided at the upper and lower ends of the clamping seat 61 and the clamping frame 63, and a plug-in adjustment portion 661 is provided at the bottom of the telescopic clamping extension 66. The plug-in adjustment portion 661 can be adjustably plugged into the corresponding clamping seat 61 or the clamping frame 63, and the plug-in adjustment portions 661 on the upper and lower sides are plugged in and connected, and a number of adjustment holes 662 are correspondingly provided on the plug-in adjustment portion 661. The clamping seat 61 and the clamping frame 63 are provided with locking screws 663 for plugging into the adjustment holes 662 to position the plug-in adjustment portion 661; the driving mechanism 2 includes a rotating drive motor 21 arranged on the assembly stand 1, the output end of the rotating drive motor 21 is connected to the axis of the crank pitch adjustment mechanism 3 and drives the crank pitch adjustment mechanism 3 to rotate, thereby driving the linkage connecting rod 4 to drive the sliding assembly 5 to slide on the assembly stand 1, and the output end of the rotating drive motor 21 is provided with a reduction motor 22.

[0039] The telescopic clamping extension 66 is used to provide more clamping area and increase the swing force-bearing area of ​​the pre-twisted wire protection bar.

[0040] To sum up, the principle of this embodiment is: the pre-twisted wire protective strip is clamped by the annular clamping gap 64 between the clamping seat 61 and the clamping frame 63, the arc-shaped pressing portion 65 performs adaptive fitting pressing, and the active stroke of the pre-twisted wire protective strip is positioned by adjusting the position of the top pressure limit portion 653; secondly, the position of the second rotating connecting shaft 55 is adjusted by adjusting the cylinder 71, thereby adjusting the reciprocating pulling stroke of the linkage connecting rod 4. When adjusting the position of the second rotating connecting shaft 55, the elastic support structure 7 is synchronously linked to ensure elastic support force and absorb vibration energy. At this time, the rotating drive motor 21 drives the crank rotating disk 31 to rotate, and the linkage connecting rod 4 pulls the sliding assembly 5 to slide, thereby driving the pre-twisted wire protective strip in the annular clamping gap 64 to swing back and forth. Through the combination of mechanical linkage and elastic buffering, the swing fatigue under various actual working conditions is accurately simulated, and efficient detection of the durability of the pre-twisted wire protective strip is achieved.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0042] Although this article uses more assembly platform 1, driving mechanism 2, rotating driving motor 21, reduction motor 22, crank pitch adjustment mechanism 3, crank rotating disk 31, rotating linkage disk body 32, connecting support rod 33, bar-shaped adjustment slot 34, linkage connecting rod 4, sliding assembly 5, connecting slide rail 51, sliding connecting seat 52, connecting seat 53, first rotating connecting shaft 54, second rotating connecting shaft 55, clamping mechanism 6, clamping seat 61, fixing screw 62, clamping frame 63, annular clamping gap 64, arc-shaped pressing portion 65, top pressure spring 6 The following terms are used herein, but the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A pre-twisted backup drain wire clamp and wire line fatigue testing machine, comprising an assembly stand (1), characterized in that: One end of the assembly platform (1) is connected to a crank pitch adjustment mechanism (3) via a driving mechanism (2); the crank pitch adjustment mechanism (3) is connected to a sliding assembly (5) slidably arranged at the other end of the assembly platform (1) via a linkage connecting rod (4); a clamping mechanism (6) for clamping the pre-twisted wire protection line is provided between the sliding assemblies (5); the crank pitch adjustment mechanism (3) is provided with an elastic support structure (7) for supporting one end of the linkage connecting rod (4); the sliding assembly (5) includes a connecting slide rail (51) symmetrically arranged on the assembly platform (1); the connecting slide rail (51) is provided with a connecting slide rail (51) A sliding connection seat (52) is provided on the slide rail (51), and a connection seat (53) is fixedly installed on the upper end of the sliding connection seat (52). The clamping mechanism (6) is positioned between the connection seats (53), and a first rotating connection shaft (54) is provided on one of the connection seats (53). One end of the linkage connecting rod (4) is rotatably connected to the first rotating connection shaft (54); a second rotating connection shaft (55) is provided on the crank pitch adjustment mechanism (3), and the second rotating connection shaft (55) is rotatably connected to the other end of the linkage connecting rod (4); the crank pitch adjustment mechanism (3) ) includes a crank rotating disk (31) arranged in an annular shape, a rotating linkage disk body (32) is provided on the inner side of the crank rotating disk (31) in the circumferential direction, and a plurality of symmetrically arranged connecting rods (33) are provided between the rotating linkage disk body (32) and the crank rotating disk (31) in the circumferential direction, and a strip-shaped adjusting slot (34) is axially provided on one of the connecting rods (33), and the second rotating connecting shaft (55) is adjustably arranged in the strip-shaped adjusting slot (34); the elastic supporting structure (7) includes an adjusting cylinder (71) arranged on the crank rotating disk (31), The output end of the regulating cylinder (71) is connected to the second rotating connecting shaft (55) and drives the second rotating connecting shaft (55) to move in the strip-shaped regulating slot (34) to adjust the positioning position, and a plurality of fixed regulating holes (73) arranged at equal intervals are provided on the connecting support rod (33) symmetrical to the connecting support rod (33) having the strip-shaped regulating slot (34). An elastic positioning connecting rod (75) is connected to the fixed regulating hole (73) through the connecting rod (74), and the end of the elastic positioning connecting rod (75) away from the connecting rod (74) is connected to the second rotating connecting shaft (55).

2. A pre-twisted backup drainage line clamp and wire line fatigue testing machine according to claim 1, characterized in that: The connecting support rod (33) is provided with a symmetrically arranged strip slide groove (76), a sliding connecting shaft (77) is slidably provided in the strip slide groove (76), and the sliding connecting shaft (77) is connected to a first arc-shaped telescopic rod (78) arranged in an arc shape, and the end of the first arc-shaped telescopic rod (78) away from the sliding connecting shaft (77) is connected to a second arc-shaped telescopic rod (782) arranged in an arc shape through a connecting rotating shaft (781), and the end of the second arc-shaped telescopic rod (782) away from the connecting rotating shaft (781) is connected to the second rotating connecting shaft (55).

3. A pre-twisted backup drainage line clamp and line fatigue testing machine according to claim 2, characterized in that: The two sides of the assembly stand (1) are connected with elastic positioning connectors (72) via positioning screws, and the ends of the elastic positioning connectors (72) away from the positioning screws are connected to the connecting shaft (781), and the ends of the second arc-shaped telescopic rods (782) located on both sides of the assembly stand (1) away from the connecting shaft (781) are plug-connected and provided with a clearance hole (783) at the overlapping portion thereof for inserting the second rotating connecting shaft (55).

4. A pre-twisted backup drainage line clamp and line fatigue testing machine according to claim 1, characterized in that: The clamping mechanism (6) includes a clamping seat (61) arranged between two connecting seats (53) and fixedly connected to the connecting seats (53) at both ends. The clamping seat (61) is connected to a clamping frame (63) via a fixing screw (62), and an annular clamping gap (64) for clamping the pre-twisted wire protection strip is formed between the clamping frame (63) and the clamping seat (61).

5. A pre-twisted backup drainage line clamp and line fatigue testing machine according to claim 4, characterized in that: The clamping seat (61) and the clamping frame (63) are provided with symmetrically arranged arc-shaped pressing parts (65) on the inner side of the circumference. The outer wall of the arc-shaped pressing part (65) is connected to the inner wall of the clamping seat (61) or the clamping frame (63) through a plurality of top pressure springs (651), and a buffer gap (652) is formed between the arc-shaped pressing part (65) and the clamping seat (61) or the clamping frame (63). A top pressure limiting part (653) is provided in the buffer gap (652) and between two adjacent top pressure springs (651). The top pressure limiting part (653) can be adjusted and positioned by an adjusting screw (654) passed through the clamping seat (61) or the clamping frame (63).

6. A pre-twisted backup drainage line clamp and line fatigue testing machine according to claim 5, characterized in that: The clamping seat (61) and the clamping frame (63) are provided with telescopic clamping extensions (66) at the upper and lower ends, and a plug-in adjustment portion (661) is provided at the bottom of the telescopic clamping extension (66). The plug-in adjustment portion (661) can be adjusted and plugged into the corresponding clamping seat (61) or the clamping frame (63), and the plug-in adjustment portions (661) on the upper and lower sides are plugged and connected, and a plurality of adjustment holes (662) are correspondingly provided on the plug-in adjustment portion (661). The clamping seat (61) and the clamping frame (63) are provided with a plurality of adjustment holes (662) for adjusting the clamping seat (61) and the clamping frame (63). A locking screw (663) is inserted into the adjustment hole (662) to position the insertion adjustment part (661); the driving mechanism (2) includes a rotation drive motor (21) arranged on the assembly platform (1), the output end of the rotation drive motor (21) is connected to the axis of the crank pitch adjustment mechanism (3) and drives the crank pitch adjustment mechanism (3) to rotate, thereby driving the linkage connecting rod (4) to drive the sliding component (5) to slide on the assembly platform (1), and the output end of the rotation drive motor (21) is provided with a reduction motor (22).

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