A construction site cable testing device and method

Abstract

The application relates to the technical field of testing devices, in particular to a construction site cable testing device and a testing method. The construction site cable testing device comprises a support, a transmission mechanism and two clamping mechanisms. Each clamping mechanism comprises a female clamp, a male clamp and an arc-shaped buckling plate. A first arc groove is formed in the side of the female clamp close to the male clamp, and the side of the male clamp close to the female clamp is provided with an arc-shaped top block. The arc-shaped buckling plate, the arc-shaped top block and the first arc groove are used to clamp the cable skin together, so that the initial curvature of the cable skin can be effectively maintained during the testing process, and the distortion of the detection result caused by the sample deformation can be fundamentally avoided. The application provides a construction site cable testing device and a testing method, so as to solve the problem that the existing detection device uses a flat clamp to force the sample to deform unnaturally when the cable skin is detected, thereby affecting the accuracy of the experimental data.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and specifically to a cable testing device and testing method for construction sites. Background Technology

[0002] In electrical engineering construction, after cables (especially multi-core control cables and armored cables) are laid, rigorous testing must be conducted both before and after wiring. The outer sheath of wires and cables (including the insulation layer and protective sleeve) is the first line of defense to ensure their long-term safe operation. The mechanical properties of the sheath, especially its tensile strength, directly affect whether the cable can effectively resist mechanical stresses such as tension, dragging, and compression from the outside during laying and use, thereby avoiding sheath cracking or insulation damage and ensuring the stability and safety of power transmission. Therefore, conducting standardized tensile tests on cable sheath samples is an indispensable part of quality control.

[0003] For example, the utility model patent with announcement number CN216349946U provides a tensile testing device. This device supports the slider to move up and down by setting a connecting column, connects the rack to the slider by the first connecting block to drive the slider to move, and uses a clamp to fix the lower part of the cable.

[0004] However, existing tensile testing machines typically use flat-jaw clamps to hold both ends of the cable sheath when testing it. Since the cable sheath itself has curvature, using flat clamps forces the sample into unnatural deformation, introducing additional stress and affecting the accuracy of the experimental data. Furthermore, before testing, it must be ensured that the sample's principal axis is perfectly aligned with the clamp's centerline; otherwise, uneven stress will occur, often requiring repeated adjustments to the sample position—a cumbersome and inefficient process. These problems limit the practical application of existing equipment in cable sheath quality control. Summary of the Invention

[0005] This invention provides a cable testing device and method for construction sites to solve the problem that existing testing devices, when using straight clamps to test cable sheaths, force the samples to undergo unnatural deformation, thus affecting the accuracy of experimental data.

[0006] The present invention provides a construction site cable testing device with the following technical solution: a construction site cable testing device includes a bracket, a transmission mechanism, two clamping mechanisms and two driving mechanisms, with the two clamping mechanisms arranged vertically in sequence.

[0007] Each clamping mechanism includes a female clamp, a male clamp, and an arc-shaped buckle plate. The female and male clamps are arranged sequentially along a first direction, which is horizontal. The female and male clamps can slide synchronously in the vertical direction and can slide relative to each other in the first direction. The female clamp has a first arc groove on the side near the male clamp, with the concave surface of the first arc groove facing the male clamp. The male clamp has an arc-shaped top block on the side near the female clamp, with the convex surface of the arc-shaped top block facing the female clamp.

[0008] An arc-shaped buckle plate is positioned within the first arc groove. The radius of curvature of the convex surface of the arc-shaped buckle plate is the same as the radius of curvature of the concave surface of the first arc groove, so that an automatic centering effect can be achieved when the arc-shaped buckle plate is placed into the first arc groove. Each arc-shaped buckle plate is used to connect to one end of the cable sheath, and the vertical center line of the arc-shaped buckle plate coincides with the vertical center line of the cable sheath.

[0009] Each drive mechanism is used to move one female clamp up and down. When the drive mechanism moves the female clamp away from another female clamp, the transmission mechanism drives the female and male clamps in each clamping mechanism to gradually move closer to each other, so as to clamp the arc-shaped buckle and the cable sheath.

[0010] Furthermore, each female clamp has a pull rod fixedly mounted on the side away from the other female clamp, and the pull rod is vertically positioned. Each drive mechanism includes a hydraulic cylinder, which is vertically mounted on the support, and the extended end of the hydraulic cylinder is fixedly connected to a pull rod.

[0011] Furthermore, the transmission mechanism includes two transmission components, each including a wedge and a first elastic element. Each wedge is slidably mounted on a pull rod, and each first elastic element is connected to a female clamp and a wedge.

[0012] A first inclined surface is provided on the side of the male clamp away from the other male clamp. A second inclined surface is provided on the wedge block, parallel to and abutting the first inclined surface. When the male clamp and the wedge block approach each other, the first and second inclined surfaces push the male clamp towards the female clamp.

[0013] Furthermore, each wedge is rotatably equipped with a rotating shaft, the axis of which is set along a second direction, which is horizontal and perpendicular to the first direction. Each rotating shaft has a rotating wheel, coaxially arranged with the shaft. The transmission mechanism also includes a pull rod and two springs, each spring having its ends connected to a rotating shaft and a male clamp, respectively, to restrict the rotation of the rotating shaft. The two ends of the pull rod are wound around the two rotating wheels, respectively, to restrict the vertical movement of the two wedges.

[0014] Furthermore, each clamping mechanism also includes at least one guide rod, which is arranged along a first direction. One end of the guide rod is fixedly connected to the male clamp, and the other end of the guide rod is slidably connected to the female clamp.

[0015] Furthermore, each clamping mechanism also includes at least one second elastic element, the two ends of which are fixedly connected to the male clamp and the female clamp, respectively.

[0016] Furthermore, a second arc groove is formed within the female clamp, with its concave surface facing the male clamp. The second arc groove is connected to the first arc groove, and is located on the side furthest from the male clamp relative to the first arc groove. The second arc groove and the first arc groove are concentric, and the radius of the second arc groove is smaller than that of the first arc groove. As the arc-shaped top block approaches the female clamp, under the action of the second arc groove, the arc-shaped top block will cause the arc-shaped buckle plate to undergo elastic deformation, reducing its radius and increasing its curvature.

[0017] Furthermore, a positioning block is fixedly installed on the side of the male clamp near the female clamp. A positioning groove is opened on the side of the female clamp near the male clamp, and the positioning block can be inserted into the positioning groove.

[0018] Furthermore, elastic clips are fixedly installed on both sides of the arc-shaped buckle along the second direction. The elastic clips are used to abut against both sides of the cable sheath.

[0019] A method for testing cables at a construction site, utilizing a cable testing device for a construction site, includes the following steps:

[0020] S1, clamp the arc-shaped buckles on the two clamping mechanisms to the upper and lower ends of the cable sheath respectively, and then place the arc-shaped buckles into the first arc groove.

[0021] S2, the drive mechanism drives the female clamp to move away from the other female clamp, and the female clamp drives the male clamp to move synchronously in the vertical direction.

[0022] S3, the transmission mechanism drives the female and male clamps in each clamping mechanism to gradually approach each other in order to clamp the arc-shaped buckle and the cable sheath.

[0023] The beneficial effects of this invention are as follows: The cable testing device for construction sites of this invention, through a clamping mechanism, first clamps the arc-shaped buckles on two clamping mechanisms to the upper and lower ends of the cable sheath, and then places the arc-shaped buckles into the first arc groove. Since the radius of curvature of the convex surface of the arc-shaped buckle is the same as the radius of curvature of the concave surface of the first arc groove, an automatic centering effect occurs during placement, causing the center line of the arc-shaped buckle to automatically coincide with the center line of the first arc groove. Furthermore, because the vertical center line of the arc-shaped buckle coincides with the vertical center line of the cable sheath, the vertical center line of the cable sheath also aligns with the center line of the first arc groove. Cable sheaths are soft, difficult to unfold, and even more difficult to align precisely manually. Using this method, the center line of the cable sheath can be aligned without repeated adjustments, which is not only simple and efficient but also effectively ensures that the center line of the cable sheath is consistent with the direction of tension, thereby significantly improving the accuracy and reliability of the test results.

[0024] Next, the drive mechanism drives the female clamp to move away from the other female clamp, and the female clamp drives the corresponding male clamp to move synchronously in the vertical direction. The transmission mechanism drives the female and male clamps in each clamping mechanism to gradually move closer to each other to clamp the arc-shaped buckle and the cable sheath.

[0025] Since the arc-shaped buckle plate, arc-shaped top block and first arc groove are all arc-shaped, the initial curvature of the cable sheath can be maintained as much as possible, thus fundamentally avoiding the distortion of test results caused by cable sheath deformation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a construction site cable testing device provided in an embodiment of the present invention;

[0028] Figure 2 A front view of a construction site cable testing device provided in an embodiment of the present invention;

[0029] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0030] Figure 4 for Figure 2 Sectional view along the BB direction;

[0031] Figure 5 An exploded view of a construction site cable testing device provided in an embodiment of the present invention;

[0032] Figure 6 for Figure 5 A magnified view of point C in the middle.

[0033] In the diagram: 200, cable sheath; 300, pull rod; 400, pull bar; 500, wedge block; 501, second inclined plane; 502, rotating shaft; 505, spring; 506, rotating wheel; 600, female clamp; 601, first arc groove; 602, positioning groove; 603, second arc groove; 700, male clamp; 701, arc-shaped top block; 702, first inclined plane; 800, guide rod; 900, second elastic element; 1000, first elastic element; 1100, arc-shaped buckle plate. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Reference Figures 1 to 6 As shown in the figure, an embodiment of the present invention provides a cable testing device for construction sites, including a bracket, a transmission mechanism, two clamping mechanisms and two driving mechanisms, with the two clamping mechanisms arranged vertically.

[0036] Each clamping mechanism includes a female clamp 600, a male clamp 700, and an arc-shaped buckle plate 1100. The female clamp 600 and the male clamp 700 are sequentially distributed along a first direction, which is horizontal. The female clamp 600 and the male clamp 700 can slide synchronously in the vertical direction and can slide relative to each other in the first direction. The female clamp 600 has a first arc groove 601 on the side near the male clamp 700, with the concave surface of the first arc groove 601 facing the male clamp 700. The male clamp 700 has an arc-shaped top block 701 on the side near the female clamp 600, with the convex surface of the arc-shaped top block 701 facing the female clamp 600.

[0037] The arc-shaped buckle 1100 is disposed in the first arc groove 601. The radius of curvature of the convex surface of the arc-shaped buckle 1100 is the same as the radius of curvature of the concave surface of the first arc groove 601, so that an automatic centering effect can be generated when the arc-shaped buckle 1100 is placed in the first arc groove 601.

[0038] The convex surface of the arc-shaped buckle 1100 and the first arc groove 601 make frictional contact. Each arc-shaped buckle 1100 is used to connect to one end of the cable sheath 200, and the vertical center line of the arc-shaped buckle 1100 coincides with the vertical center line of the cable sheath 200.

[0039] Each drive mechanism is used to move a female clamp 600 up and down. When the drive mechanism moves the female clamp 600 away from another female clamp 600, the transmission mechanism drives the female clamp 600 and male clamp 700 in each clamping mechanism to gradually move closer to each other, so as to clamp the arc-shaped buckle plate 1100 and the cable sheath 200.

[0040] First, the arc-shaped clips 1100 on the two clamping mechanisms are clamped at the upper and lower ends of the cable sheath 200, respectively. Then, the arc-shaped clips 1100 are placed into the first arc groove 601. Since the radius of curvature of the convex surface of the arc-shaped clip 1100 is the same as the radius of curvature of the concave surface of the first arc groove 601, an automatic centering effect occurs during placement, causing the center line of the arc-shaped clip 1100 to automatically coincide with the center line of the first arc groove 601. Furthermore, since the vertical center line of the arc-shaped clip 1100 coincides with the vertical center line of the cable sheath 200, the vertical center line of the cable sheath 200 also aligns with the center line of the first arc groove 601. The cable sheath 200 is soft and difficult to unfold, making manual alignment even more challenging. This method eliminates the need for repeated adjustments to align the center line of the cable sheath 200, simplifying operation, increasing efficiency, and effectively ensuring that the center line of the cable sheath 200 is consistent with the direction of tension, thereby significantly improving the accuracy and reliability of the test results.

[0041] Next, the drive mechanism drives the female clamp 600 to move away from the other female clamp 600, and the female clamp 600 drives the corresponding male clamp 700 to move synchronously in the vertical direction. The transmission mechanism drives the female clamp 600 and male clamp 700 in each clamping mechanism to gradually move closer to each other, so as to clamp the arc-shaped buckle plate 1100 and the cable sheath 200.

[0042] Since the arc-shaped buckle plate 1100, the arc-shaped top block 701 and the first arc groove 601 are all arc-shaped, the initial curvature of the cable sheath 200 can be maintained as much as possible, thus fundamentally avoiding the distortion of the test results caused by the deformation of the cable sheath 200.

[0043] In this embodiment, a pull rod 300 is fixedly installed on the side of each female clamp 600 away from the other female clamp 600, and the pull rod 300 is vertically arranged. Each drive mechanism includes a hydraulic cylinder, which is vertically arranged on the bracket, and the extended end of the hydraulic cylinder is fixedly connected to a pull rod 300. When the two hydraulic cylinders are activated, the hydraulic cylinders drive the two female clamps 600 to move away from each other in a direction via the pull rod 300.

[0044] In this embodiment, the transmission mechanism includes two transmission components, each including a wedge 500 and a first elastic element 1000. The wedge 500 has a through hole, and each wedge 500 is slidably connected in the vertical direction through the through hole and a pull rod 300. Each first elastic element 1000 is connected to a female clamp 600 and a wedge 500.

[0045] A first inclined surface 702 is provided on the side of the male clamp 700 away from the other male clamp 700. Along the vertical direction, and in the direction in which the two male clamps 700 gradually approach each other, the first inclined surface 702 gradually moves away from the female clamp 600. A second inclined surface 501 is provided on the wedge block 500, parallel to and abutting against the first inclined surface 702. When the male clamp 700 and the wedge block 500 approach each other, under the action of the first inclined surface 702 and the second inclined surface 501, the male clamp 700 is pushed towards the female clamp 600.

[0046] In this embodiment, each wedge 500 has a rotating shaft 502 rotatably mounted within it. The axis of the rotating shaft 502 is arranged along a second direction, which is horizontal and perpendicular to the first direction. Each rotating shaft 502 is equipped with a rotating wheel 506, which is coaxially arranged with the rotating shaft 502. The transmission mechanism also includes a pull bar 400 and two springs 505. Each spring 505 has its two ends connected to a rotating shaft 502 and a male clamp 700, respectively, for limiting the rotation of the rotating shaft 502. The two ends of the pull bar 400 are wound around the two rotating wheels 506, respectively, for limiting the vertical movement of the two wedges 500.

[0047] Each arc-shaped buckle 1100 is rolled up along the concave surface of both sides of the arc-shaped buckle 1100 in the second direction to clamp the cable sheath 200 along both sides of the second direction. The width of the first arc groove 601 along the second direction is the same as the width of the arc-shaped buckle 1100 along the second direction, so that when the arc-shaped buckle 1100 is placed into the first arc groove 601, the first arc groove 601 can hold the arc-shaped buckle 1100 in place.

[0048] In this embodiment, each clamping mechanism further includes at least one guide rod 800, which is arranged along a first direction. One end of the guide rod 800 is fixedly connected to the male clamp 700, and the other end of the guide rod 800 is slidably connected to the female clamp 600. When the female clamp 600 moves in the vertical direction, it drives the male clamp 700 to move synchronously through the guide rod 800.

[0049] In this embodiment, each clamping mechanism further includes at least one second elastic element 900, which is sleeved on the guide rod 800, and the two ends of the second elastic element 900 are fixedly connected to the male clamp 700 and the female clamp 600, respectively.

[0050] In the initial state, the second elastic element 900 is at its original length. When the arc-shaped buckle plate 1100 and the cable sheath 200 are inserted into the first arc groove 601, the second elastic element 900 has a certain amount of stretching, so that the arc-shaped top block 701 and the female clamp 600 can pre-fix the arc-shaped buckle plate 1100.

[0051] In this embodiment, a second arc groove 603 is also provided inside the female clamp 600. The concave surface of the second arc groove 603 faces the male clamp 700. The second arc groove 603 is connected to the first arc groove 601, and the second arc groove 603 is located on the side away from the male clamp 700 relative to the first arc groove 601. The second arc groove 603 and the first arc groove 601 are concentric, and the radius of the second arc groove 603 is smaller than the radius of the first arc groove 601.

[0052] As the arc-shaped top block 701 gradually approaches the female clamp 600, both of them lose concentricity with the arc-shaped buckle plate 1100. At this point, thanks to the presence of the second arc groove 603, the arc-shaped top block 701 causes the arc-shaped buckle plate 1100 to undergo elastic deformation, reducing its radius and increasing its curvature. This deformation effectively prevents the situation where the pressure of the arc-shaped top block 701 on the center of the arc-shaped buckle plate 1100 is greater than the pressure on its sides, which may occur due to loss of concentricity, thus ensuring a uniform distribution of clamping pressure on the cable sheath 200.

[0053] In this embodiment, a positioning block is fixedly provided on the side of the male clamp 700 near the female clamp 600. A positioning groove 602 is provided on the side of the female clamp 600 near the male clamp 700, and the positioning block can be inserted into the positioning groove 602.

[0054] In this embodiment, elastic clips are fixedly provided on both sides of the arc-shaped buckle plate 1100 along the second direction. The elastic clips are used to abut against both sides of the cable sheath 200.

[0055] A method for testing cables at a construction site, utilizing a cable testing device for a construction site, includes the following steps:

[0056] S1, Initially, the second elastic element 900 is at its original length. First, the arc-shaped buckles 1100 on the two clamping mechanisms are clamped at the upper and lower ends of the cable sheath 200, respectively. Then, the male clamp 700 is pulled, moving it away from the female clamp 600, at which point the second elastic element 900 is stretched. Next, the arc-shaped buckle 1100 is placed into the first arc groove 601. Since the radius of curvature of the convex surface of the arc-shaped buckle 1100 is the same as the radius of curvature of the concave surface of the first arc groove 601, an automatic centering effect occurs during placement, causing the center line of the arc-shaped buckle 1100 to automatically coincide with the center line of the first arc groove 601. Furthermore, because the vertical center line of the arc-shaped buckle 1100 coincides with the vertical center line of the cable sheath 200, the vertical center line of the cable sheath 200 also aligns with the center line of the first arc groove 601. The cable sheath 200 is soft and difficult to unfold, making manual precise alignment even more challenging. Using this method, the center line of the cable sheath 200 can be aligned without repeated adjustments. This method is not only simple and efficient, but also effectively ensures that the center line of the cable sheath 200 is consistent with the direction of the tensile force, thereby significantly improving the accuracy and reliability of the test results.

[0057] Then, the gripper is released, and under the restoring force of the second elastic element 900, the male clamp 700 moves towards the female clamp 600 until the arc-shaped top block 701 on the male clamp 700 abuts against the cable sheath 200. At this point, the arc-shaped top block 701 and the arc-shaped buckle plate 1100 are coaxially aligned. In this state, because the arc-shaped buckle plate 1100 maintains frictional contact with the first arc groove 601, and the second elastic element 900 still has a certain amount of pre-tension, the arc-shaped top block 701 and the female clamp 600 can pre-fix the arc-shaped buckle plate 1100. Since the arc-shaped buckle plate 1100, the arc-shaped top block 701, and the first arc groove 601 are all arc-shaped, the initial curvature of the cable sheath 200 can be maintained as much as possible, fundamentally avoiding distortion of the test results caused by deformation of the cable sheath 200.

[0058] S2, Next, activate the two hydraulic cylinders. The hydraulic cylinders drive the two female clamps 600 to move away from each other via the pull rod 300. When the female clamps 600 move, they drive the male clamp 700 to move synchronously in the vertical direction via the guide rod 800.

[0059] When the upper female clamp 600 moves upward, it first compresses the first elastic element 1000. During the compression of the first elastic element 1000, the mainspring 505 restricts the rotation of the rotating shaft 502, and simultaneously restricts the movement of the two wedges 500 through the pull bar 400. The torque of the mainspring 505 acting on the rotating shaft 502 and the tension of the pull bar 400 together overcome the elastic force of the first elastic element 1000, so that when the upper female clamp 600 and male clamp 700 move upward, the wedges 500 remain stationary in the vertical direction relative to the female clamp 600 and male clamp 700, that is, the female clamp 600 and male clamp 700 gradually approach the wedges 500. When the first elastic element 1000 is compressed to its limit, the female clamp 600 drives the corresponding wedges 500 to move synchronously through the first elastic element 1000.

[0060] S3, as the male clamp 700 gradually approaches the wedge block 500, the interaction between the first inclined surface 702 and the second inclined surface 501 pushes the male clamp 700 to move towards the female clamp 600 in the first direction, thereby gradually clamping the cable sheath 200 and the arc-shaped buckle plate 1100. This design avoids applying excessive initial clamping force to the cable sheath 200 and also prevents the cable sheath 200 from coming off between the male clamp 700 and the female clamp 600 during the tensile test.

[0061] Furthermore, during this process, since the pull rod 300 (force-applying end) and the female clamp 600 (clamping end) are a rigid whole with a fixed distance between them, the force transmission is synchronized and without lag, thereby ensuring that the strain rate of the cable sheath 200 remains constant.

[0062] As the arc-shaped top block 701 gradually approaches the female clamp 600, both of them lose their coaxiality with the arc-shaped buckle plate 1100. At this point, thanks to the presence of the second arc groove 603, the arc-shaped top block 701 causes the arc-shaped buckle plate 1100 to undergo elastic deformation, reducing its radius and increasing its curvature. This deformation effectively prevents the situation where the pressure of the arc-shaped top block 701 on the center of the arc-shaped buckle plate 1100 is greater than the pressure on its sides due to loss of concentricity, thus ensuring a uniform distribution of clamping pressure on the cable sheath 200.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable testing device for construction sites, characterized in that: It includes a support frame, a transmission mechanism, two clamping mechanisms, and two drive mechanisms, with the two clamping mechanisms arranged vertically in sequence. Each clamping mechanism includes a female clamp, a male clamp, and an arc-shaped buckle plate; the female clamp and the male clamp are distributed sequentially along a first direction, which is a horizontal direction; the female clamp and the male clamp can slide synchronously in the vertical direction and can slide relative to each other in the first direction; a first arc groove is provided on the side of the female clamp near the male clamp, with the concave surface of the first arc groove facing the male clamp; an arc-shaped top block is provided on the side of the male clamp near the female clamp, with the convex surface of the arc-shaped top block facing the female clamp; The arc-shaped buckle is set in the first arc groove. The radius of curvature of the convex surface of the arc-shaped buckle is the same as the radius of curvature of the concave surface of the first arc groove, so that an automatic centering effect can be generated when the arc-shaped buckle is placed in the first arc groove. Each arc-shaped buckle is used to connect to one end of the cable sheath, and the vertical center line of the arc-shaped buckle coincides with the vertical center line of the cable sheath. Each drive mechanism is used to move a female clamp up and down; when the drive mechanism moves the female clamp away from another female clamp, the transmission mechanism drives the female clamp and male clamp in each clamping mechanism to gradually move closer to each other, so as to clamp the arc-shaped buckle and the cable sheath. Each female clamp has a pull rod fixedly installed on the side away from the other female clamp, and the pull rod is vertically installed; the transmission mechanism includes two transmission components, each transmission component includes a wedge and a first elastic element; each wedge is slidably mounted on a pull rod, and each first elastic element connects a female clamp and a wedge; A first inclined surface is provided on the side of the male clamp away from the other male clamp; a second inclined surface is provided on the wedge block, which is parallel to and abuts against the first inclined surface; when the male clamp and the wedge block approach each other, under the action of the first and second inclined surfaces, the male clamp is pushed to move towards the female clamp. Each wedge has a rotating shaft rotatably mounted inside it. The axis of the rotating shaft is set along a second direction, which is horizontal and perpendicular to the first direction. Each rotating shaft has a rotating wheel, which is coaxial with the rotating shaft. The transmission mechanism also includes a pull bar and two springs. Each spring has a rotating shaft and a male clamp at both ends, which are used to limit the rotation of the rotating shaft. The two ends of the pull bar are wound around the two rotating wheels, which are used to limit the movement of the two wedges in the vertical direction.

2. The construction site cable testing device according to claim 1, characterized in that: Each drive mechanism includes a hydraulic cylinder, which is vertically mounted on a bracket, and the extended end of the hydraulic cylinder is fixedly connected to a tie rod.

3. The construction site cable testing device according to claim 1, characterized in that: Each clamping mechanism also includes at least one guide rod, which is arranged along a first direction. One end of the guide rod is fixedly connected to the male clamp, and the other end of the guide rod is slidably connected to the female clamp.

4. The cable testing device for construction sites according to claim 3, characterized in that: Each clamping mechanism also includes at least one second elastic element, the two ends of which are fixedly connected to the male clamp and the female clamp, respectively.

5. A cable testing device for construction sites according to claim 1, characterized in that: The female fixture also has a second arc groove, the concave surface of which faces the male fixture. The second arc groove is connected to the first arc groove, and the second arc groove is located on the side away from the male fixture relative to the first arc groove. The radius of the second arc groove is smaller than that of the first arc groove. As the arc-shaped top block approaches the mother clamp, under the action of the second arc groove, the arc-shaped top block will cause the arc-shaped buckle to undergo elastic deformation, reducing its radius and increasing its curvature.

6. The cable testing device for construction sites according to claim 1, characterized in that: A positioning block is fixedly installed on the side of the male clamp near the female clamp; a positioning groove is opened on the side of the female clamp near the male clamp, and the positioning block can be inserted into the positioning groove.

7. The construction site cable testing device according to claim 1, characterized in that: The curved buckle plate is fixedly provided with elastic clips on both sides along the second direction; the elastic clips are used to abut against the two sides of the cable sheath.

8. A method for testing cables at a construction site, utilizing a cable testing device for a construction site as described in any one of claims 1-7, characterized in that, Includes the following steps: S1, clamp the arc-shaped buckles on the two clamping mechanisms to the upper and lower ends of the cable sheath respectively, and then place the arc-shaped buckles into the first arc groove; S2, the drive mechanism drives the female clamp to move away from the other female clamp, and the female clamp drives the male clamp to move synchronously in the vertical direction; S3, the transmission mechanism drives the female and male clamps in each clamping mechanism to gradually approach each other in order to clamp the arc-shaped buckle and the cable sheath.

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