Power line tension tester

Abstract

The invention discloses a power line tension testing machine, and relates to the field of wire harness testing, the power line tension testing machine comprises two terminals used for connecting two ends of a wire harness, and further comprises a carrying table, an annular rotating table is arranged on the carrying table, a traction mechanism comprises a traction ring and a traction seat, and a force application assembly comprises an annular platform coaxially arranged with the annular rotating table. An annular cam guide groove is formed in the annular platform, a guide wheel is slidably connected into the cam guide groove, and when the annular rotating table rotates, the traction ring applies constant or periodically changing side pulling force to the middle of the wire harness; a cam guide groove of a force application assembly is matched with a guide wheel, so that a first spring is compressed when a sliding base moves in the radial direction, linear control over side tension is achieved, pre-tightening force fine adjustment can be achieved through a nut in threaded connection, the compression force of the first spring can be monitored in real time through a force sensor, and the rotating speed of an annular rotating table is controlled; feedback adjustment of side tension is realized, and test errors caused by mechanism fatigue are avoided.

Description

Technical Field

[0001] The present invention relates to the technology of harness testing, and particularly to a power cord tensile testing machine. Background Art

[0002] The tensile test of a power cord usually reflects the durability and reliability of the power cord, and also directly affects the safety of equipment operation. For example, in the Chinese invention patent with the publication number CN116256242B, a detection system for the anti-side-pull performance of an automotive harness is disclosed. It applies a lateral load to the harness through an elastic element (such as an elastic cord) in cooperation with an eccentric mechanism. The deformation of the elastic cord provides the lateral pull force. However, since the elastic coefficient of the elastic cord is easily affected by factors such as fatigue and temperature, the amplitude of the lateral pull force is unstable and cannot be accurately regulated. Especially, it is difficult to maintain a constant lateral pull force in different test cycles. In addition, the fatigue deterioration of the elastic cord is concealed and not easy to monitor in real time, there is a risk of inaccurate test results, affecting the reliability of the detection results. Summary of the Invention

[0003] The purpose of the present invention is to provide a power cord tensile testing machine to solve the above deficiencies in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A power cord tensile testing machine includes two connection terminals for connecting the two ends of a harness, and further includes:

[0005] A carrier platform, on which a circular rotating platform is arranged. The two connection terminals are located on the axis of the circular rotating platform, and the circular rotating platform can rotate on the carrier platform around its own axis;

[0006] A traction mechanism, which includes a traction ring and a traction seat. The outer side of the traction ring is rotatably connected to the inner side of the traction seat. The traction seat is slidably installed on one side of a sliding seat through a sliding rod. The sliding seat is slidably installed on the circular rotating platform and can move along the radial direction of the circular rotating platform. One end of the sliding rod away from the traction seat is threadedly connected with a nut, and a first spring is sleeved on the surface of the sliding rod between the sliding seat and the nut;

[0007] A force application component, which includes a circular platform coaxially arranged with the circular rotating platform. An annular cam guide groove is formed on the circular platform. The cam guide groove has at least one protruding part. A guide wheel is slidably connected in the cam guide groove. One end of the guide wheel is fixedly connected to the sliding seat;

[0008] When the circular rotating platform rotates, the guide wheel moves along the guide groove and drives the sliding seat to move along the radial direction of the circular rotating platform, so that the traction ring applies a constant or periodically changing lateral pull force to the middle of the harness.

[0009] Further, the annular rotating table is connected to a first driving member for driving its rotation. The first driving member includes an annular gear installed on the circumferential side of the annular rotating table. One side of the annular gear is meshed and connected with a first gear, and the first gear is connected to an A driving member for driving its rotation.

[0010] Further, a force sensor is arranged between the first spring and the sliding seat.

[0011] Further, the cam guide groove has a plurality of discontinuous protruding portions.

[0012] Further, the cam guide groove has a plurality of continuous protruding portions.

[0013] Further, a limiting member is arranged on the annular platform. The limiting member is used to limit the rotation of the annular platform relative to the carrier or the annular rotating table.

[0014] Further, the limiting member includes a plurality of card slots opened on the circumferential side of the annular platform. There are through openings at both ends of the card slots. The limiting member includes a clamping block. The clamping block can enter the card slot from the through opening and can slide along the card slot. A screw rod is threadedly connected to the inner wall of the clamping block. An L-shaped support is rotatably connected to the surface of the screw rod. One end of the L-shaped support is slidably connected to a pin rod. A plurality of pin holes are opened on the circumferential sides of the annular rotating table and the carrier.

[0015] Further, a torsion assembly is arranged between the traction ring and the traction seat. The torsion assembly includes a first ring body installed at the bottom of the traction ring and a second ring body installed at the bottom of the traction seat. The second ring body can move along the axial direction of the traction seat, and an elastic member is installed on the side of the second ring body away from the first ring body. The elastic force of the elastic member acts on the second ring body to make it tend to approach the first ring body.

[0016] Further, friction plates are installed on the opposite sides of the first ring body and the second ring body.

[0017] Further, spherical bodies distributed in an annular array are arranged at the bottom of the first ring body. The centers of the spherical bodies are located inside the plane where the bottom of the first ring body is located. A spherical surface groove adapted to the spherical bodies is arranged on one side of the second ring body.

[0018] Compared with the prior art, a power cord tensile testing machine provided by the present invention has the following beneficial effects:

[0019] This power cord tensile testing machine realizes the linear control of the lateral tensile force amplitude by the cooperation of the cam groove of the force application component and the guide wheel. When the sliding seat moves radially, the first spring is compressed. When the annular rotating table drives the guide wheel to move along the protruding part of the cam groove, the sliding seat is driven by the guide wheel to displace radially outward, compressing the first spring to increase the lateral tensile force. The elastic coefficient of the first spring is stable and less affected by environmental factors. And the pre-tightening force can be finely adjusted by the nut connected by threads, ensuring the repeatability of the lateral tensile force in long-term tests as much as possible. The compression force of the first spring can be monitored in real time through the setting of the force sensor. Combining with the rotational speed control of the annular rotating table, the feedback adjustment of the lateral tensile force is realized, avoiding test errors caused by mechanism fatigue.

[0020] By adjusting the number and shape of the protruding parts of the cam groove (such as continuous / discontinuous protrusions), the periodic change mode of the lateral tensile force can be controlled, simulating the actual working conditions of intermittent or continuous changes, and improving the practicability of the testing machine. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is the overall structure schematic diagram provided by the embodiment of the present invention;

[0023] Figure 2 Provided by the embodiment of the present invention Figure 1 Partial cross-sectional schematic diagram;

[0024] Figure 3 It is the separated state structure schematic diagram of the carrier table, annular platform and annular rotating table provided by the embodiment of the present invention;

[0025] Figure 4 It is the separated state structure schematic diagram of the traction mechanism and the annular rotating table provided by the embodiment of the present invention;

[0026] Figure 5 It is the schematic diagram of the cam groove structure with multiple continuous protruding parts opened on the annular platform provided by the embodiment of the present invention;

[0027] Figure 6 It is the schematic diagram of the cam groove structure with multiple discontinuous protruding parts opened on the annular platform provided by the embodiment of the present invention;

[0028] Figure 7 It is the schematic diagram of the traction mechanism structure provided by the embodiment of the present invention;

[0029] Figure 8Schematic diagram of the limiting member provided by the embodiment of the present invention;

[0030] Figure 9 Provided by the embodiment of the present invention Figure 8 Enlarged view of part A in

[0031] Figure 10 Schematic diagram of the structure of the torsion assembly provided by the embodiment of the present invention;

[0032] Figure 11 Schematic diagram showing that when the lengths of the wire harnesses are different, the wire harnesses are bent at the same angle in the embodiment of the present invention.

[0033] Explanation of reference numerals:

[0034] 1. Wiring terminal; 2. Carrier platform; 3. Ring-shaped rotating platform; 4. Traction mechanism; 41. Traction ring; 42. Traction seat; 43. Slide bar; 44. Slide seat; 45. Nut; 46. First spring; 47. Force sensor; 5. Force application assembly; 51. Ring-shaped platform; 52. Cam guide groove; 53. Protruding part; 54. Guide wheel; 6. First driving member; 61. Ring-shaped gear; 62. First gear; 63. A driving member; 7. Limiting member; 71. Card slot; 72. Insertion opening; 73. Block; 74. Screw; 75. L-shaped support; 76. Pin rod; 77. Pin hole; 8. Torsion assembly; 81. First ring body; 82. Second ring body; 83. Elastic member; 84. Sphere; 85. Spherical groove; 9. Wire harness. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Embodiment, please refer to Figure 1 - Figure 11 , a power cord tensile testing machine, including two wiring terminals 1 for connecting the two ends of the wire harness 9, and a tensile sensor 47 (not shown in the figure) is installed at the wiring terminal 1 for detecting the change in tensile force during the power cord testing process. The tensile testing machine further includes:

[0037] A carrier platform 2, on which a ring-shaped rotating platform 3 is provided. The two wiring terminals 1 are located on the axis of the ring-shaped rotating platform 3, and the ring-shaped rotating platform 3 can rotate on the carrier platform 2 around its own axis;

[0038] The traction mechanism 4 includes a traction ring 41 and a traction seat 42. The outer side of the traction ring 41 is rotatably connected to the inner side of the traction seat 42. The traction seat 42 is slidably mounted on one side of a slide base 44 through a slide rod 43. The slide base 44 is slidably mounted on the annular rotating table 3 and can move along the radial direction of the annular rotating table 3. A nut 45 is threadedly connected to one end of the slide rod 43 away from the traction seat 42. A first spring 46 is sleeved on the surface of the slide rod 43 between the slide base 44 and the nut 45;

[0039] The force application assembly 5 includes an annular platform 51 coaxially arranged with the annular rotating table 3. An annular cam guide groove 52 is formed on the annular platform 51. The cam guide groove 52 has at least one protruding portion 53. A guide wheel 54 is slidably connected in the cam guide groove 52. One end of the guide wheel 54 is fixedly connected to the slide base 44;

[0040] When the annular rotating table 3 rotates, the guide wheel 54 moves along the guide groove and drives the slide base 44 to move along the radial direction of the annular rotating table 3, so that the traction ring 41 applies a constant or periodically changing lateral pulling force to the middle of the wire harness 9;

[0041] After the power cord to be tested (subsequently replaced by the wire harness 9) is installed on the two connection terminals 1, it is in the state as shown in Figure 1 The wire harness 9 presents a certain bending angle under the action of the traction mechanism 4 and is tested under the rotation of the annular rotating table 3. The specific implementation scenario is as follows:

[0042] Preparation stage:

[0043] First, one end of the wire harness 9 to be tested is connected to one connection terminal 1. The other end of the wire harness 9 passes through the middle of the traction ring 41 and is connected to the other connection terminal 1. Under the restriction of the connection terminals 1, the two ends of the wire harness 9 are located on the axis of the annular rotating table 3. Check and adjust the annular rotating table 3 to make the guide wheel 54 located at a position outside the protruding portion of the cam guide groove 52 close to the axis of the annular rotating table 3. By rotating the nut 45, adjust the distance between the traction seat 42 and the slide base 44, so that the traction ring 41 drives the wire harness 9 to move until the wire harness 9 is in a slightly taut state. At this time, the first spring 46 is also in a slightly compressed state, and the lateral pulling force received by the wire harness 9 is regarded as zero (for the device, the force detected by the sensor can be zeroed). Complete the preparation process before the test;

[0044] Testing stage:

[0045] When performing a constant side tension test, by slowly rotating the annular rotating table 3, the guide wheel 54 below the sliding seat 44 moves on a protruding portion 53 of the cam guide groove 52. The guide wheel 54 drives the sliding seat 44 to move away from the axis of the annular rotating table 3, thereby further compressing the first spring 46. The traction ring 41 and the traction seat 42 are basically unable to move due to the restriction of the wire harness 9. The elastic force of the first spring 46 will also further act on the wire harness 9. Although the wire harness 9 does not move, the tension it receives increases. When the tension detected by the sensor reaches the test condition, the annular rotating table 3 and the annular platform 51 rotate synchronously, and the guide wheel 54 remains relatively stationary with respect to the cam guide groove 52. During the test process, the wire harness 9 will be subjected to a constant side tension and maintain the same bending angle for testing;

[0046] When performing a side tension test with periodic changes, the annular rotating table 3 rotates, while the annular platform 51 does not rotate. During the rotation of the annular rotating table 3, the guide wheel 54 continuously rotates within the cam guide groove 52. Each time the guide wheel 54 passes through a protruding portion 53, it will compress the first spring 46 once, and cause the side tension of the traction ring 41 on the wire harness 9 to increase from small to large and then decrease. Thus, by setting the number of protruding portions 53, the periodic change of the side tension is realized, so as to perform a test with the same bending angle under the periodically changing side tension;

[0047] It should be noted that the periodically changing side tension can be realized when the annular rotating table 3 continuously rotates in one rotation direction, or when the annular rotating table 3 rotates reciprocally around its central axis. The minimum angle during the reciprocal rotation should include the angular range where a protruding portion 53 is located. That is to say, when the annular rotating table 3 rotates reciprocally, the guide wheel 54 reciprocally moves at least on one protruding portion 53;

[0048] The above test methods can correspond to different test scenarios. For example, when performing a test with a periodically changing side tension, it can simulate the situation where the wire harness 9 is subjected to a continuous and periodically changing tension caused by other objects. Other test scenarios are not listed here.

[0049] In an embodiment of the present invention, the annular rotating table 3 is connected to a first driving member 6 for driving its rotation. The first driving member 6 includes an annular gear 61 installed on the peripheral side of the annular rotating table 3. One side of the annular gear 61 is meshed and connected with a first gear 62, and the first gear 62 is connected to an A driving member 63 for driving its rotation;

[0050] In an embodiment of the present invention, the A driving member 63 is an electric motor, a hydraulic motor or a pneumatic motor. The output end of the electric motor or the output end of the hydraulic motor or the output end of the pneumatic motor is connected to the first gear 62, and the A driving member 63 is installed on one side of the carrier table 2;

[0051] In an embodiment of the present invention, a force sensor 47 is disposed between the first spring 46 and the slide base 44, which is used to detect the magnitude of the force exerted by the first spring 46 on the slide base 44, so as to further obtain the accurate value of the lateral pulling force of the traction mechanism 4 on the wire harness 9, improving the accuracy during the test and the reliability of the test result;

[0052] It should be noted that the force sensor 47 is transmitted through a data transmission line. Since the data transmission line will rotate with the rotation of the annular rotating table 3, a rotary connector is used at its connection with the data receiving unit to prevent the data transmission line from being wound or broken due to rotation, ensuring the stability and continuity of data transmission.

[0053] In an embodiment of the present invention, the cam guide groove 52 has a plurality of discontinuous protruding portions 53, as Figure 6 shown;

[0054] In an embodiment of the present invention, the cam guide groove 52 has a plurality of continuous protruding portions 53, as Figure 5 shown;

[0055] It should be noted that the protruding portion 53 is not necessarily limited to the shape shown in the figure, and its shape and quantity can be adjusted according to actual test requirements to ensure that the change in the lateral pulling force meets the expectations, so as to adapt to the test requirements of different wire harness 9 materials and structures, thereby enhancing the comprehensiveness and practicality of the test. In actual operation, by adjusting the shape and quantity of the protruding portion 53, the change range and frequency of the lateral pulling force can be precisely controlled to ensure the accuracy and reliability of the test result. By optimizing the design of the cam guide groove 52, more complex actual working conditions can be simulated, making the test result more valuable for reference.

[0056] In an embodiment of the present invention, a limiting member 7 is disposed on the annular platform 51, and the limiting member 7 is used to limit the rotation of the annular platform 51 relative to the carrier 2 or the annular rotating table 3;

[0057] In an embodiment of the present invention, the limiting member 7 can be a general clutch, such as a roller one-way clutch, which is installed at the output end of the A driving member 63. The clutch is connected to the second gear. A tooth portion is provided on the annular platform 51 and meshes with the second gear. Under the action of the one-way clutch, when the A driving member 63 drives the annular rotating table 3 to rotate, one rotation direction will not drive the annular platform 51 to rotate, and in the other rotation direction, the one-way clutch allows the annular platform 51 to rotate synchronously with the annular rotating table 3, thereby realizing the limiting function of the annular platform 51 in a specific direction, enabling the annular platform 51 to rotate relative to the carrier 2 or the annular rotating table 3, so as to perform the aforementioned adjustment, so that the traction ring 41 exerts a constant or periodically changing lateral pulling force on the middle part of the wire harness 9;

[0058] It should be noted that the annular platform 51 can also be connected to another first driving member 6, that is, the annular platform 51 is independently driven by another first driving member 6, so as to achieve more flexible adjustment and control and meet different test requirements.

[0059] In an embodiment of the present invention, another specific example of the limiting member 7 is provided. Specifically, the limiting member 7 includes a plurality of card slots 71 opened on the peripheral side of the annular platform 51. Both ends of the card slot 71 are provided with insertion openings 72. The limiting member 7 includes a clamping block 73. The clamping block 73 can enter the card slot 71 from the insertion opening 72 and can slide along the card slot 71. A screw rod 74 is threadedly connected to the inner wall of the clamping block 73. The surface of the screw rod 74 is rotatably connected to an L-shaped support 75. One end of the L-shaped support 75 is slidably connected to a pin rod 76. A plurality of pin holes 77 are opened on the peripheral sides of the annular rotating table 3 and the carrier table 2;

[0060] As Figure 8 and Figure 9 shown, when it is necessary to fix the annular platform 51 and the annular rotating table 3 to rotate synchronously, the L-shaped support 75 is installed upward, and then the pin rod 76 is inserted into the pin hole 77 of the annular rotating table 3. The position of the clamping block 73 is adjusted by the screw rod 74, and then the screw rod 74 is tightened to fix the annular platform 51 and the annular rotating table 3, so as to ensure that the two rotate synchronously;

[0061] When it is necessary to fix the annular platform 51 and the carrier table 2, the L-shaped support 75 is installed downward, and the pin rod 76 is inserted into the pin hole 77 of the carrier table 2. The subsequent operations are the same as above, so that the annular platform 51 does not rotate when the annular rotating table 3 rotates;

[0062] A plurality of limiting members 7 can be provided. During adjustment, the corresponding number of limiting members 7 can be selected according to different test requirements for fixation to ensure the stability of the test process.

[0063] In an embodiment of the present invention, a torsion assembly 8 is provided between the traction ring 41 and the traction seat 42. The torsion assembly 8 includes a first ring body 81 installed at the bottom of the traction ring 41 and a second ring body 82 installed at the bottom of the traction seat 42. The second ring body 82 can move along the axial direction of the traction seat 42, and an elastic member 83 is installed on the side of the second ring body 82 away from the first ring body 81. The elastic force of the elastic member 83 acts on the second ring body 82 to make it tend to approach the first ring body 81;

[0064] In an embodiment of the present invention, friction plates (not shown in the figure) are installed on the opposite sides of the first ring body 81 and the second ring body 82;

[0065] In one embodiment of the present invention, a sphere 84 is arranged at the bottom of the first ring body 81 in an annular array, and the center of the sphere 84 is located inside the plane where the bottom of the first ring body 81 is located. On one side of the second ring body 82, a spherical surface groove 85 adapted to the sphere 84 is provided. As Figure 10 shown, through the arrangement of the torsion assembly 8, the relative rotation between the traction ring 41 and the traction seat 42 is restricted to a certain extent. During specific use, as the annular rotating table 3 rotates, there is a certain torsional force between the surface of the wire harness 9 and the traction ring 41, and the wire harness 9 will twist. The greater the degree of twisting, the greater the tangential force on the traction ring 41. That is to say, the arrangement of the torsion assembly 8 will cause the wire harness 9 to twist at the beginning of the test. As the degree of twisting increases, the acting force on the traction ring 41 also increases. When the acting force is greater than the traction ring 41 pushing the second ring body 82 to compress the elastic member 83, the first ring body 81 and the traction ring 41 connected thereto will be able to rotate. At this time, the wire harness 9 will no longer twist and will not return to its original state. During the subsequent test process, the wire harness 9 will be subjected to a side pull force while being tested in a certain twisted posture, so as to more realistically simulate the complex stress conditions in actual use. The first ring body 81 and the second ring body 82 achieve a limited rotational freedom through a friction plate or a sphere-spherical surface groove structure. When the wire harness generates a torsional force due to rotation, the pre-tightening force of the elastic member can inhibit excessive twisting and at the same time allow adaptive fine-tuning to avoid local stress concentration in the wire harness; the threshold value of the torsional resistance is set by the elastic force of the elastic member to ensure that the wire harness only bears a side pull force without additional torsional load during the test process, improving the accuracy of the test data.

[0066] As Figure 11 shown, since there is generally a certain deviation in the length of the wire harness 9, in order to keep the bending angle of the wire harness 9 the same during the test, it can be adjusted through the traction mechanism 4 and the adjustment of the connection terminal 1 (the connection terminal 1 can move along the axis of the annular rotating table 3, which is a prior art, such as the upper and lower clamping members on a general tensile testing machine), so that the distance between the traction ring 41 and the traction seat 42 is adjustable, ensuring that wire harnesses 9 of different lengths have the same bending angle during the test, thereby ensuring the consistency of the test conditions and further improving the accuracy and comparability of the experimental data.

[0067] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the present invention.

Claims

1. A power cord tension tester, comprising two terminals (1) for connecting two ends of a wiring harness (9), characterized in that: Also includes: A carrier (2), wherein an annular rotating platform (3) is arranged on the carrier (2), and the two connection terminals (1) are located on the axis of the annular rotating platform (3), and the annular rotating platform (3) can rotate around its own axis on the carrier (2); A traction mechanism (4), comprising a traction ring (41) and a traction seat (42), wherein the outer side of the traction ring (41) is rotatably connected to the inner side of the traction seat (42), the traction seat (42) is slidably mounted on one side of a slide seat (44) via a slide rod (43), the slide seat (44) is slidably mounted on an annular rotating table (3) and is capable of moving in the radial direction of the annular rotating table (3), a nut (45) is threadedly connected to one end of the slide rod (43) away from the traction seat (42), and a first spring (46) is sleeved on the surface of the slide rod (43) between the slide seat (44) and the nut (45); A force-applying assembly (5), comprising an annular platform (51) coaxially arranged with the annular rotating platform (3), an annular cam guide groove (52) being provided on the annular platform (51), the cam guide groove (52) having at least one protruding portion (53), a guide wheel (54) being slidably connected in the cam guide groove (52), one end of the guide wheel (54) being fixedly connected to the slide seat (44); When the annular rotating table (3) rotates, the guide wheel (54) moves along the guide groove and drives the slide seat (44) to move along the radial direction of the annular rotating table (3), so that the traction ring (41) applies a constant or periodically changing lateral pulling force to the middle of the wire harness (9).

2. A power cord tension testing machine according to claim 1, characterized in that: The annular rotating table (3) is connected to a first driving member (6) for driving the rotation thereof. The first driving member (6) comprises an annular gear (61) mounted on the circumference of the annular rotating table (3). One side of the annular gear (61) is meshedly connected to a first gear (62). The first gear (62) is connected to an A driving member (63) for driving the rotation thereof.

3. A power cord tension testing machine according to claim 1, characterized in that: A force sensor (47) is arranged between the first spring (46) and the slide seat (44).

4. A power cord tension testing machine according to claim 1, characterized in that: The cam guide groove (52) has a plurality of discontinuous protrusions (53).

5. A power cord tension testing machine according to claim 1, characterized in that: The cam guide groove (52) has a plurality of continuous protruding portions (53).

6. A power cord tension testing machine according to claim 1, characterized in that: A limiting member (7) is provided on the annular platform (51), and the limiting member (7) is used to limit the rotation of the annular platform (51) relative to the carrier (2) or the annular rotating platform (3).

7. A power cord tension testing machine according to claim 6, characterized in that: The limiting member (7) comprises a plurality of slots (71) provided on the circumferential side of the annular platform (51), and penetration holes (72) are provided at both ends of the slots (71). The limiting member (7) comprises a clamping block (73), and the clamping block (73) can enter the slot (71) from the penetration hole (72) and can slide along the slot (71). The inner wall of the clamping block (73) is threadedly connected with a screw rod (74), and the surface of the screw rod (74) is rotatably connected with an L-shaped support (75), and one end of the L-shaped support (75) is slidably connected with a pin rod (76). The circumferential sides of the annular rotating platform (3) and the carrier (2) are both provided with a plurality of pin holes (77).

8. A power cord tension testing machine according to claim 1, characterized in that: A torsion assembly (8) is arranged between the traction ring (41) and the traction seat (42), and the torsion assembly (8) comprises a first ring body (81) installed at the bottom of the traction ring (41) and a second ring body (82) installed at the bottom of the traction seat (42), the second ring body (82) being movable along the axial direction of the traction seat (42), and an elastic member (83) being installed on a side of the second ring body (82) away from the first ring body (81), the elastic force of the elastic member (83) acting on the second ring body (82) so that it has a tendency to approach the first ring body (81).

9. A power cord tension testing machine according to claim 8, characterized in that: Friction plates are installed on opposite sides of the first ring body (81) and the second ring body (82).

10. A power cord tension testing machine according to claim 8, characterized in that: The bottom of the first ring body (81) is provided with spheres (84) distributed in an annular array, the centers of the spheres (84) are located inside the plane where the bottom of the first ring body (81) is located, and one side of the second ring body (82) is provided with a spherical groove (85) adapted to the spheres (84).

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