Tensile strength automatic detection machine applied to electric wire quality sampling inspection

Abstract

The invention relates to the technical field of snapping detection, and discloses a tensile strength automatic detection machine applied to electric wire quality spot check, which comprises an upper clamping unit, the upper clamping unit comprises an upper shell, a lower shell is arranged below the upper shell, and a plurality of sliding rods are arranged on the upper end surface of the lower shell; a sliding hole matched with the sliding rod is formed in the lower end face in the upper shell, a driving motor is arranged in the upper shell, a rotating shaft is connected to a main shaft of the driving motor, a cylindrical cavity is formed in the upper end face of the lower shell, the rotating shaft extends into the cylindrical cavity, a first inclined disc is arranged on the shaft wall of the rotating shaft, and a first annular groove is formed in the side edge of the first disc. A first sliding ball head is arranged on the inner wall of the cylindrical cavity and slides in the first annular groove. By arranging the upper clamping unit, periodic vibration is applied while the electric wire is stretched in a tensile test, so that dynamic load superposition is realized, and actual scenes such as wind vibration and mechanical vibration are simulated.

Description

Technical Field

[0001] The invention relates to the technical field of breakage detection, and in particular to an automatic tensile strength detection machine used for random inspection of wire quality. Background Art

[0002] An automatic tensile strength testing machine is an automated device used to determine the maximum bearing capacity of a material or component under tension. It utilizes high-precision sensors, a servo drive system, and an intelligent control system to automate the entire process from specimen clamping and uniform tensioning to data acquisition and analysis. The machine is typically equipped with adaptive fixtures and is compatible with various metal, plastic, and cable specifications, as well as new materials testing. It records tensile force-displacement curves in real time and accurately calculates parameters such as tensile strength, yield strength, and elongation at break, providing new material testing services.

[0003] The patent publication number CN119688448A discloses an automatic tensile strength testing device for wires and cables, which belongs to the field of tensile strength testing for wires and cables, and includes a frame, a control console provided on one side of the frame, a mounting plate slidably provided on the frame, a lower cylinder fixedly provided on the frame, an upper cylinder fixedly installed on the bottom of the outer surface of the mounting plate, a first corrugated tube fixedly connected to a clamping head at one end away from the telescopic groove, and multiple groups of clamping heads arranged in a ring shape. By providing a clamping assembly, the present application can automatically clamp the wires and cables in the process of inserting the wires and cables into the upper and lower cylinders, in accordance with the manner in which the clamping assembly of the upper cylinder fixes the upper end of the wires and cables and the clamping assembly of the lower cylinder fixes the lower end of the wires and cables. There is no need to manually fix the two ends of the wires and cables on the clamps of the tensile testing machine respectively, and adopts direct plug-in fixation, which simplifies the action of fixing the wires and cables on the clamps of the tensile testing machine.

[0004] The existing technology has the following defects: Existing automatic tensile strength testing equipment is generally designed based on the principle of uniaxial tensile testing, and its core function is concentrated on the determination of mechanical properties under static or quasi-static loads. This type of equipment usually uses a servo motor to drive a ball screw to achieve uniform stretching, and combines high-precision force sensors and displacement sensors to collect data, which can accurately calculate basic parameters such as tensile strength, yield point and elongation at break. However, with the complexity of industrial application scenarios, materials often bear multi-physical field coupling loads such as tension, vibration, and impact in actual service. The limitations of traditional equipment are becoming increasingly prominent: First, existing technologies can only achieve tensile loading in a single direction, and cannot integrate dynamic loads such as periodic vibration and random impact through mechanical structures or control algorithms. This leads to significant deviations between test conditions and actual working conditions, which restricts the reliability evaluation and iteration efficiency of high-end cable products. Summary of the Invention

[0005] In view of the above problems in the prior art, an automatic tensile strength testing machine for random inspection of wire quality is proposed.

[0006] The present application provides an automatic tensile strength testing machine for random inspection of wire quality, the purpose of which is to make the test body withstand multi-physical field coupling loads such as tension, vibration, and impact in the tensile test, realize dynamic load superposition, and simulate complex real working conditions.

[0007] The technical solution of the present invention is: an automatic tensile strength testing machine for random inspection of wire quality, comprising a base, a slide rail vertically arranged on the base, a dynamometer slidably arranged in the slide rail, a connecting rod arranged at the lower end of the dynamometer, an upper clamping unit arranged at the lower end of the connecting rod, and a lower clamping unit arranged on the base; The electric wire body is clamped between the upper clamping unit and the lower clamping unit; The upper clamping unit includes an upper shell, a lower shell is arranged below the upper shell, a plurality of sliding columns are arranged on the upper end surface of the lower shell, and a sliding hole matching the sliding columns is arranged on the lower end surface of the upper shell. A driving motor is arranged in the upper shell, and a rotating shaft is connected to the main shaft of the driving motor. A cylindrical cavity is provided on the upper end surface of the lower shell, and the rotating shaft extends into the cylindrical cavity. An inclined disc is provided on the shaft wall of the rotating shaft, and an annular groove is provided on the side edge of the disc. A sliding ball head is provided on the inner wall of the cylindrical cavity, and the sliding ball head slides in the annular groove.

[0008] By adopting the above scheme and setting up an upper clamping unit, in the tensile test, the upper clamping unit continuously moves upward with the dynamometer, exerts tension on the wire body, and at the same time drives the motor main shaft to rotate, driving the rotating shaft to rotate. The disk on the rotating shaft rotates in an inclined state, driving the sliding ball head in the annular groove to vibrate up and down, thereby driving the lower shell to vibrate up and down, applying periodic vibration while stretching the wire, realizing dynamic load superposition, simulating actual scenarios such as wind vibration and mechanical vibration.

[0009] Furthermore, a pair of flat grooves are opened on the shaft wall of the rotating shaft, a square hole is opened at the center of the disc one, the square hole is sleeved on the pair of flat grooves, a pin rod is passed through the center of the flat groove and the pin rod is connected to the hole wall of the square hole.

[0010] By adopting the above solution, the square hole is sleeved on a pair of flat grooves, so that the disc 1 can be tilted relative to the rotation axis, so as to change the tilt amplitude of the disc 1 and the amplitude of the periodic vibration.

[0011] Furthermore, a limit strip is provided on the shaft wall of the rotating shaft above the disc one, and a disc two is slidingly provided on the rotating shaft located in the length section of the limit strip, and an annular groove two is provided on the side edge of the disc two, a sliding rod is vertically provided in the upper shell body, and flat teeth are provided on the sliding rod, and a sliding ball head two is provided at the lower end of the sliding rod, and the sliding ball head two slides in the annular groove two, and the lower end face of the disc two and the upper end face of the disc one are connected by a connecting rod, and a rotating rod is provided in the upper shell body and perpendicular to the direction of the sliding rod, and an annular tooth is provided on the rod wall of the rotating rod, and the annular tooth is meshed with the flat teeth.

[0012] By adopting the above scheme, by rotating the rotating rod, the rotating rod drives the sliding rod to slide vertically, and the sliding ball head on the sliding rod drives the disc 2 to slide on the rotating axis. The disc 2 pulls the disc 1 to rotate around the pin rod through the connecting rod, thereby changing the inclination amplitude of the disc 1. It is used to superimpose different periodic vibration amplitudes when stretching the wire body, simulating actual scenarios such as wind vibration and mechanical vibration of different intensities.

[0013] Furthermore, a connecting block is provided on the lower end surface of the lower shell, a sliding groove is provided in the connecting block, a pair of symmetrical clamping claws are slidably provided in the sliding groove, and a clamping block is provided on each clamping claw.

[0014] According to the above solution, a pair of sliding clamping claws are provided to clamp the electric wire body.

[0015] Furthermore, a pair of clamping claws are provided with fastening bolts running through them, a nut is provided at the threaded end of the fastening bolt, and a tightening wrench is hinged on the nut.

[0016] By adopting the above solution, the end of the wire body is clamped by pre-tightening the fastening bolt and then turning the tightening wrench.

[0017] Furthermore, the lower end surface of the disc 2 is provided with a hinged ear 1, and the upper end surface of the disc 1 is provided with a hinged ear 2, and both the hinged ear 1 and the hinged ear 2 are hinged to the connecting rod.

[0018] By adopting the above solution, the disc one and the disc two are connected via the hinge ear one and the hinge ear and the connecting rod, and when the disc two moves upward, the tilt angle of the disc one is changed.

[0019] Furthermore, the groove walls of the annular groove 1 and the annular groove 2 are both configured to be arc-shaped, and the groove widths gradually increase toward the groove openings.

[0020] By adopting the above solution and the above arrangement, the friction between the annular groove 1 and the sliding ball head 1 and the friction between the annular groove 2 and the sliding ball head 2 are reduced.

[0021] Furthermore, arc-shaped protrusions are evenly spaced on the upper and lower groove walls of the annular groove 1.

[0022] By adopting the above solution and providing an arc-shaped protrusion, the sliding ball head will generate slight vibration when sliding in the annular groove, thereby realizing a multi-mode coupling test of tension + periodic vibration + random impact.

[0023] Furthermore, the thickness of the arc-shaped protrusion gradually increases toward the notch.

[0024] By adopting the above scheme and the above arrangement, when the tilt angle of the disc 1 increases, the sliding ball head 1 contacts the thicker part of the arc-shaped protrusion, thereby achieving the superposition of larger periodic vibration and larger impact amplitude.

[0025] Beneficial effects of the present invention: By setting up an upper clamping unit, during the tensile test, the upper clamping unit continuously moves upward with the dynamometer, applying tension to the wire body, and at the same time driving the motor main shaft to rotate, driving the rotating shaft to rotate. The disk on the rotating shaft rotates in a tilted state, driving the sliding ball head in the annular groove to vibrate up and down, thereby driving the lower shell to vibrate up and down, applying periodic vibration while stretching the wire, realizing dynamic load superposition, simulating actual scenarios such as wind vibration and mechanical vibration.

[0026] By rotating the rotating rod, the rotating rod drives the sliding rod to slide vertically, and the sliding ball head on the sliding rod drives Disc 2 to slide on the rotating axis. Disc 2 pulls Disc 1 to rotate around the pin rod through the connecting rod, thereby changing the inclination amplitude of Disc 1. It is used to superimpose different periodic vibration amplitudes when stretching the wire body, simulating actual scenarios such as wind vibration and mechanical vibration of different intensities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of an automatic tensile strength testing machine for random inspection of wire quality according to the present invention; Figure 2 A three-dimensional diagram of the upper clamping unit of the automatic tensile strength testing machine for random inspection of wire quality according to the present invention; Figure 3 For the present invention Figure 2 Right view; Figure 4 For the present invention Figure 2 Front view of Figure 5 For the present invention Figure 3 Cross-sectional view at AA in the middle; Figure 6 A three-dimensional diagram of a rotating shaft and components on the shaft in an automatic tensile strength testing machine for random inspection of wire quality according to the present invention; Figure 7 For the present invention Figure 6 Top view of Figure 8 For the present invention Figure 6Other perspectives; Figure 9 A three-dimensional diagram of fastening bolts and related components in an automatic tensile strength testing machine for random inspection of wire quality according to the present invention; Figure 10 The figure is a state change diagram of the automatic tensile strength testing machine used for random inspection of wire quality according to the present invention during operation.

[0028] In the picture: 1. Base; 2. Slide rail; 3. Dynamometer; 4. Connecting rod; 5. Upper clamping unit; 6. Lower clamping unit; 7. Wire body; 8. Upper shell; 9. Lower shell; 10. Sliding column; 11. Drive motor; 12. Rotating shaft; 13. Cylindrical cavity; 14. Disc 1; 15. Annular groove 1; 16. Sliding ball head 1; 17. Flat groove; 18. Square hole; 19. Pin; 20. Limit strip; 21. Disc 2; 22. Annular groove 2; 23. Sliding rod; 24. Flat gear; 25. Sliding ball head 2; 26. Connecting rod; 27. Rotating rod; 28. Annular gear; 29. Connecting block; 30. Slide groove; 31. Clamping claw; 32. Clamping block; 33. Fastening bolt; 34. Nut; 35. Tightening wrench; 36. Articulated ear 1; 37. Articulated ear 2; 38. Arc-shaped protrusion. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] Example 1, reference Figure 1-10, which is the first embodiment of the present invention, provides an automatic tensile strength testing machine for random inspection of wire quality, including a base 1, a slide rail 2 vertically arranged on the base 1, a dynamometer 3 slidably arranged in the slide rail 2, a connecting rod 4 arranged at the lower end of the dynamometer 3, an upper clamping unit 5 arranged at the lower end of the connecting rod 4, and a lower clamping unit 6 arranged on the base 1; a wire body 7 is clamped between the upper clamping unit 5 and the lower clamping unit 6; the upper clamping unit 5 includes an upper shell 8, a lower shell 9 is arranged below the upper shell 8, and the lower shell 9 The upper end surface of the upper shell 8 is provided with multiple sliding columns 10, the lower end surface of the upper shell 8 is provided with sliding holes matching the sliding columns 10, a driving motor 11 is provided in the upper shell 8, and a rotating shaft 12 is connected to the main shaft of the driving motor 11, a cylindrical cavity 13 is provided on the upper end surface of the lower shell 9, and the rotating shaft 12 extends into the cylindrical cavity 13, an inclined disc 14 is provided on the shaft wall of the rotating shaft 12, and an annular groove 15 is provided on the side edge of the disc 14, and a sliding ball head 16 is provided on the inner wall of the cylindrical cavity 13, and the sliding ball head slides in the annular groove 15.

[0032] In this embodiment, a slide motor is provided in the slide rail 2, and the slide motor is connected to the dynamometer 3. The slide motor crawls in the slide rail 2 to apply tension to the wire body 7, and the tensile strength of the wire body 7 is detected. The dynamometer 3 displays the tension applied to the wire body 7 in real time. A button for controlling the vertical movement of the slide motor is provided on the base 1; the lower clamping unit 6 is used to clamp the lower end of the wire body 7, and its structure can be the same as the upper clamping unit 5, or it can be a clamping claw with only a clamping function; a spacing is provided between the upper shell 8 and the lower shell 9 to reserve space for the periodic vibration of the lower shell 9, and multiple sliding columns 10 on the upper end face of the lower shell 9 slide in the sliding hole on the lower end face of the upper shell 8, which plays a role in limiting the vertical movement of the lower shell 9; the width of the annular groove 15 is slightly larger than the diameter of the sliding ball head 16, and when the inclined disk 14 rotates periodically with the rotating shaft 12, the sliding ball head 16 will vibrate sinusoidally in the vertical direction.

[0033] By setting up the upper clamping unit 5, in the tensile test, the upper clamping unit 5 is continuously moved upward along with the dynamometer 3, applying tension to the wire body 7, and at the same time driving the main shaft of the motor 11 to rotate, driving the rotating shaft 12 to rotate, and the disk 14 on the rotating shaft 12 rotates in a tilted state, driving the sliding ball head 16 in the annular groove 15 to vibrate up and down, thereby driving the lower shell 9 to vibrate up and down, applying periodic vibration while stretching the wire, realizing dynamic load superposition, simulating actual scenarios such as wind vibration and mechanical vibration.

[0034] Reference Figure 6A pair of flat grooves 17 are formed on the wall of the rotating shaft 12, and a square hole 18 is formed at the center of the disc 14. The square hole 18 is mounted on the pair of flat grooves 17. A pin 19 is passed through the center of the flat groove 17 and connected to the wall of the square hole 18. By mounting the square hole 18 on the pair of flat grooves 17, the disc 14 can be tilted relative to the rotating shaft 12, thereby changing the tilt amplitude of the disc 14 and thus the amplitude of the periodic vibration.

[0035] Reference Figure 5-Figure 6 A limit strip 20 is provided on the shaft wall of the rotating shaft 12 above the disc 1 14, and a disc 21 is slidingly provided on the rotating shaft 12 at the length section of the limit strip 20. An annular groove 22 is provided on the side edge of the disc 21, and a sliding rod 23 is vertically provided in the upper shell 8. A flat tooth 24 is provided on the sliding rod 23, and a sliding ball head 25 is provided at the lower end of the sliding rod 23. The sliding ball head 25 slides in the annular groove 22, and the lower end surface of the disc 21 and the upper end surface of the disc 1 14 are connected by a connecting rod 26. A rotating rod 27 is provided in the upper shell 8 and perpendicular to the direction of the sliding rod 23, and an annular tooth 28 is provided on the rod wall of the rotating rod 27, which meshes with the flat tooth 24.

[0036] In this embodiment, one end of the rotating rod 27 extends out of the upper shell 8, and its end is also provided with a slot for inserting a wrench. By turning the rotating rod 27 by turning the wrench, high friction is treated between the rod wall of the rotating rod 27 and the upper shell 8; a limit groove matching the limit bar 20 is provided on the disc 21, so that the disc 21 can slide vertically and rotate synchronously with the rotating shaft 12; a track groove for the sliding rod 23 to slide vertically is provided in the upper shell 8.

[0037] By rotating the rotating rod 27, the rotating rod 27 drives the sliding rod 23 to slide vertically, and the sliding ball head on the sliding rod 23 drives the disc 2 21 to slide on the rotating shaft 12. The disc 2 21 pulls the disc 1 14 to rotate around the pin rod 19 through the connecting rod 26, thereby changing the inclination amplitude of the disc 14, which is used to superimpose different periodic vibration amplitudes when stretching the wire body 7, simulating actual scenarios such as wind vibration, mechanical vibration, etc. of different intensities.

[0038] Reference Figure 2-Figure 5 The lower end surface of the lower shell 9 is provided with a connecting block 29, a slide groove 30 is provided in the connecting block 29, a pair of symmetrical clamping claws 31 are slidably provided in the slide groove 30, and each clamping claw 31 is provided with a clamping block 32. The pair of sliding clamping claws 31 are provided to clamp the wire body 7.

[0039] Reference Figure 5A fastening bolt 33 is provided through the pair of clamping claws 31. A nut 34 is provided at the threaded end of the fastening bolt 33. A clamping wrench 35 is hinged on the nut 34. The clamping wrench 35 includes a pressure handle and a pressure wheel. The pressure wheel and the nut 34 are eccentrically hinged to tighten the pair of clamping claws 31 when the pressure wheel rotates. By pre-tightening the fastening bolt 33 and then pulling the clamping wrench 35, the end of the wire body 7 is clamped.

[0040] Reference Figure 8 The lower end surface of disk 21 is provided with hinged lug 1 36, and the upper end surface of disk 14 is provided with hinged lug 2 37. Both hinged lug 1 36 and hinged lug 2 37 are hingedly connected to connecting rod 26. Hinge lug 1 36 and hinged lug 37, together with connecting rod 26, connect disk 14 to disk 21. When disk 21 moves upward, the tilt angle of disk 14 is changed.

[0041] Reference Figure 5 The walls of the annular groove 15 and the annular groove 22 are both arc-shaped, and the groove width gradually increases toward the groove opening. This configuration reduces the friction between the annular groove 15 and the sliding ball head 16, and reduces the friction between the annular groove 22 and the sliding ball head 25.

[0042] Reference Figure 6 Arc-shaped bumps 38 are evenly spaced on the upper and lower walls of annular groove 15. The presence of these bumps creates subtle vibrations when the sliding ball head 16 slides within the annular groove 15, enabling a multi-mode coupled test combining tension, periodic vibration, and random impact.

[0043] Reference Figure 6 The thickness of the arc-shaped protrusion 38 gradually increases toward the notch. Through the above arrangement, when the tilt angle of the disk 14 increases, the sliding ball head 16 contacts the thicker part of the arc-shaped protrusion 38, achieving the superposition of larger periodic vibration and larger impact amplitude.

[0044] Working principle of the present invention: During the tensile test, the upper clamping unit 5, linked to the dynamometer 3 via a high-precision slide motor, moves upward at a steady rate, applying an axial tensile load to the cable body 7 while simultaneously driving the motor 11 to rotate the rotating shaft 12. The two-stage, adjustable-tilt disc assembly mounted on the rotating shaft 12 achieves dynamic vibration amplitude control through an innovative mechanical linkage structure: Disc 14 utilizes a swash plate design with an adjustable inclination of 15° to 75°. Its annular groove 15 is embedded with an ultra-hard silicon nitride ceramic sliding ball head 16, which converts rotation into axial vibration through centrifugal motion, driving the lower housing 9 to generate high-frequency vibration. Disc 21 is controlled by a sliding rod 23 and a rotating rod 27 via a rack-and-pinion mechanism, pushing the sliding rod 23 to slide vertically. The sliding ball head 25 at its end engages with the radial annular groove 22 of Disc 21, causing Disc 21 to displace axially along the rotating shaft 12. This, in turn, dynamically changes the inclination of Disc 14 around the pin 19 through a four-link mechanism 26, achieving stepless vibration amplitude regulation. As the sliding ball head 16 slides within the annular groove 15, it is hindered by the curved bump 38, generating subtle vibrations. This structure breaks through the limitations of traditional fixed amplitudes and dynamically adjusts vibration intensity in real time during testing, precisely matching mechanical vibration levels from 1 to 12. It simultaneously superimposes random impact and steady-state tensile loads to create a three-modal coupled loading environment: tension, periodic vibration, and random impact. This provides a high-fidelity composite mechanical testing platform for applications such as vortex-induced vibration suppression in deep-sea cables and wind-induced fatigue analysis of high-speed rail contact lines.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic tensile strength testing machine for random inspection of wire quality, comprising a base (1), characterized in that: It also includes a slide rail (2) vertically arranged on the base (1), a dynamometer (3) slidably arranged in the slide rail (2), a connecting rod (4) arranged at the lower end of the dynamometer (3), an upper clamping unit (5) arranged at the lower end of the connecting rod (4), and a lower clamping unit (6) arranged on the base (1); The electric wire body (7) is clamped between the upper clamping unit (5) and the lower clamping unit (6); The upper clamping unit (5) includes an upper shell (8), a lower shell (9) is provided below the upper shell (8), a plurality of sliding columns (10) are provided on the upper end surface of the lower shell (9), a sliding hole matching the sliding columns (10) is provided on the lower end surface of the upper shell (8), a driving motor (11) is provided in the upper shell (8), a rotating shaft (12) is connected to the main shaft of the driving motor (11), a cylindrical cavity (13) is provided on the upper end surface of the lower shell (9), the rotating shaft (12) extends into the cylindrical cavity (13), an inclined disc (14) is provided on the shaft wall of the rotating shaft (12), an annular groove (15) is provided on the side edge of the disc (14), a sliding ball head (16) is provided on the inner wall of the cylindrical cavity (13), and the sliding ball head slides in the annular groove (15).

2. The automatic tensile strength testing machine for random inspection of wire quality according to claim 1 is characterized by: A pair of flat grooves (17) are provided on the shaft wall of the rotating shaft (12), a square hole (18) is provided at the center of the disc (14), the square hole (18) is sleeved on the pair of flat grooves (17), a pin rod (19) is passed through the center of the flat groove (17), and the pin rod (19) is connected to the hole wall of the square hole (18).

3. The automatic tensile strength testing machine for random inspection of wire quality according to claim 2 is characterized in that: A limit strip (20) is provided on the shaft wall of the rotating shaft (12) above the disc 1 (14), and a disc 2 (21) is slidably provided on the rotating shaft (12) at the length section of the limit strip (20), and an annular groove 2 (22) is provided on the side edge of the disc 2 (21). A sliding rod (23) is vertically provided in the upper shell (8), and a flat tooth (24) is provided on the sliding rod (23). A sliding ball head 2 (25) is provided at the lower end of the sliding rod (23), and the sliding ball head 2 (25) slides in the annular groove 2 (22). The lower end surface of the disc 2 (21) and the upper end surface of the disc 1 (14) are connected through a connecting rod (26). A rotating rod (27) is provided in the upper shell (8) and perpendicular to the sliding rod (23). An annular tooth (28) is provided on the rod wall of the rotating rod (27), and the annular tooth (28) is meshed with the flat tooth (24).

4. The automatic tensile strength testing machine for random inspection of wire quality according to claim 1 is characterized in that: The lower end surface of the lower shell (9) is provided with a connecting block (29), a sliding groove (30) is provided in the connecting block (29), a pair of symmetrical clamping claws (31) are slidably provided in the sliding groove (30), and each clamping claw (31) is provided with a clamping block (32).

5. The automatic tensile strength testing machine for random inspection of wire quality according to claim 4 is characterized in that: A fastening bolt (33) is provided through a pair of the clamping claws (31), a nut (34) is provided at the threaded end of the fastening bolt (33), and a tightening wrench (35) is hinged on the nut (34).

6. The automatic tensile strength testing machine for random inspection of wire quality according to claim 3 is characterized by: The lower end surface of the second disc (21) is provided with a hinged ear (36), and the upper end surface of the first disc (14) is provided with a hinged ear (37). Both the hinged ear (36) and the hinged ear (37) are hinged to the connecting rod (26).

7. The automatic tensile strength testing machine for random inspection of wire quality according to claim 3 is characterized by: The groove walls of the annular groove 1 (15) and the annular groove 2 (22) are both arranged to be arc-shaped, and the groove widths gradually increase toward the groove openings.

8. The automatic tensile strength testing machine for random inspection of wire quality according to claim 7, characterized in that: Arc-shaped protrusions (38) are evenly spaced on the upper and lower groove walls of the annular groove (15).

9. The automatic tensile strength testing machine for random inspection of wire quality according to claim 8, characterized in that: The thickness of the arc-shaped projection (38) gradually increases toward the notch.

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