Cable anti-cracking testing device

Abstract

The utility model provides a cable anti-cracking testing device which comprises a base and a driving mechanism, the base is provided with a first sleeve used for fixing one end of a cable, the first sleeve is rotatably connected with the base, the moving end of the driving mechanism is connected with a second sleeve used for fixing the other end of the cable, and the second sleeve is rotatably connected with the base. The second sleeve is rotationally connected with the moving end of the driving mechanism, a supporting arm is arranged at the moving end of the driving mechanism, the supporting arm can jack up the cable from the lower portion to enable the cable to arch upwards, and the driving mechanism can drive the second sleeve and the supporting arm to synchronously do reciprocating motion in the length direction of the cable; the supporting arm provides an initial deformation force for the cable, the elastic arc plate is adopted to restrain the deformation of the cable, the two are combined to perform auxiliary positioning on the bending direction and angle of the cable, the actual operation condition of the cable is simulated in reciprocating motion, failure analysis can be quickly, visually and effectively performed on the cable, the structure is simple, and the operation is convenient. The operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable detection equipment technical field, concretely relates to a cable anti-cracking testing device. BACKGROUND

[0002] The cracking of cable sheath and insulation layer, especially the subtle cracking that is difficult to be perceived by naked eyes, is an important reason leading to early failure of cable, equipment failure and even safety accidents. Therefore, before the cable is put into formal use, the cable needs to be tested for anti-cracking in advance to evaluate the cable performance, so as to ensure the electrical safety and reliability in long-term use.

[0003] Since the large-scale cable testing device has large investment, long testing period and complicated operation, many manufacturers are limited by their own testing capacity and can only perform simplified testing. For example, instead of testing the complete cable sample, only the sheath or insulation material manufactured into cable is tested. However, the cable is a complex multi-layer system, and the sheath and insulation layer will generate internal stress due to the presence of the conductor in the processing process and will bear stress due to thermal expansion and contraction of the conductor in use. These stresses generated by structure and actual working conditions cannot be simulated by material itself testing, and therefore, the test result cannot truly reflect the anti-cracking performance of the finished cable and cannot effectively evaluate the quality of the finished cable and optimize the production process. In addition, the traditional anti-cracking testing device, such as the heat aging box combined with a simple bending device, is usually designed for conventional section cables, but for large section cables, especially super large cables with a cable diameter exceeding 10 cm, the existing testing device often cannot perform anti-cracking performance testing on large cables due to the mismatch of space, force and other factors. SUMMARY

[0004] The utility model aims at providing a cable anti-cracking testing device to solve the above problems.

[0005] The utility model adopts the technical scheme of:

[0006] A cable anti-cracking testing device, comprising a base and a driving mechanism, a first sleeve for fixing one end of the cable is arranged on the base, the first sleeve is rotationally connected with the base, a second sleeve for fixing the other end of the cable is connected to the moving end of the driving mechanism, the second sleeve is rotationally connected with the moving end of the driving mechanism, a support arm is arranged on the moving end of the driving mechanism, the support arm can lift the cable from below to make the cable arch upward, and the driving mechanism can drive the second sleeve and the support arm to synchronously move back and forth along the length direction of the cable.

[0007] As a further improved technical scheme of the utility model, one end of the support arm is connected with the moving end of the driving mechanism, and the other end abuts against and lifts the cable from below.

[0008] As a further improved technical scheme of the utility model, a rotating part is arranged on the moving end of the driving mechanism, and the rotating part is used for adjusting the elevation angle of the support arm.

[0009] As a further improved technical scheme of the utility model, the driving mechanism comprises a motor and a linearly extended horizontal rail, the extension direction of the base is perpendicular to the horizontal rail, a sliding column is arranged on the horizontal rail, the motor can drive the sliding column to reciprocate on the horizontal rail, and the support arm and the second sleeve are arranged on the sliding column.

[0010] As a further improved technical scheme of the utility model, the driving mechanism further comprises a control unit, and the control unit is used for controlling the operation of the motor.

[0011] As a further improved technical scheme of the utility model, the driving mechanism further comprises a first sensor, and the first sensor is used for monitoring the moving speed of the sliding column and feeding back to the control unit.

[0012] As a further improved technical scheme of the utility model, the driving mechanism further comprises a second sensor, and the second sensor is used for monitoring the position of the sliding column on the horizontal rail and feeding back to the control unit.

[0013] As a further improved technical scheme of the utility model, an elastic arc plate is arranged on the horizontal rail, the arc-shaped opening of the elastic arc plate faces the horizontal rail, one end of the elastic arc plate abuts against the base, and the other end abuts against the sliding column, and the elastic arc plate is used for providing upward arching support force for the cable and limiting the arching shape of the cable.

[0014] As a further improved technical scheme of the utility model, a camera is arranged above the elastic arc plate, and the camera is used for observing the cable.

[0015] As a further improved technical scheme of the utility model, the first sleeve is hinged to the base, and the second sleeve is hinged to the sliding column.

[0016] The utility model has the beneficial effects that:

[0017] Through the above structure, an initial deformation force is provided for the cable by the support arm, and the elastic arc plate is used to constrain the deformation of the cable, the combination of the two assists in positioning the bending direction and angle of the cable, the actual operation condition of the cable is simulated in the reciprocating motion, the cable can be quickly, intuitively and effectively analyzed for failure, the structure is simple, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of an initial state of a cable anti-cracking test device;

[0019] Figure 2 is a structural schematic view of a running state of a cable anti-cracking test device;

[0020] Figure 3 is a structural schematic view of an embodiment of a support arm;

[0021] Figure 4 is a structural schematic view of another embodiment of a support arm.

[0022] Wherein: 1-cable, 2-base, 3-first sleeve, 4-second sleeve, 5-support arm, 501-supporting surface, 6-positioning piece, 701-motor, 702-horizontal rail, 703-sliding column, 704-control unit, 705-first sensor, 706-second sensor, 8-elastic arc plate, 9-camera. DETAILED DESCRIPTION

[0023] The utility model will be described in detail in combination with the specific embodiments shown in the drawings. However, these embodiments do not limit the utility model, and the changes in structure, method or function made by those skilled in the art based on these embodiments are included in the protection scope of the utility model.

[0024] If the utility model involves orientation (for example, up, down, left, right, front, back, outside, inside, etc.) when expressing, the orientation involved needs to be defined, for example, "for the purpose of clearly expressing the position and direction described in the utility model, the operator of the instrument is taken as the reference, the end close to the operator is the proximal end, and the end far away from the operator is the distal end." Or define with paper as the reference. Of course, if the position relationship between the two is defined by mutual reference in the subsequent description, it can not be defined here.

[0025] A cable anti-cracking test device, such as Figures 1-2As shown, the cable cracking resistance testing device comprises a base 2 and a driving mechanism, the base 2 is arranged on the ground or a workbench or other horizontal surface, a first sleeve 3 is arranged on the base 2, the first sleeve 3 is used for fixing one end of the cable 1, the first sleeve 3 is rotationally connected with the base 2, the first sleeve 3 can rotate around the connection between the first sleeve 3 and the base 2, a second sleeve 4 is connected on the moving end of the driving mechanism, the second sleeve 4 is used for fixing the other end of the cable 1, the second sleeve 4 is rotationally connected with the moving end of the driving mechanism, the second sleeve 4 can rotate around the moving end of the driving mechanism, the second sleeve 4 is at the same horizontal height as the first sleeve 3, so that the cable 1 can be kept in a horizontal erection state in the initial state, a supporting arm 5 is arranged on the moving end of the driving mechanism, the supporting arm 5 can lift the cable 1 from below so that the cable 1 is arched upward, the cable 1 forms an arc shape similar to a '∩', the driving mechanism can drive the second sleeve 4 and the supporting arm 5 to move synchronously along the length direction of the cable 1.

[0026] In the embodiment, the cable 1 is a large-diameter cable, the diameter D of the cable 1 is generally greater than or equal to 6 cm, the large-diameter cable 1 generally has high rigidity and strong bending resistance, so that, when being overhead laid, the cable 1 can resist gravity by itself and keep the original horizontal shape, and is not prone to bending and sagging due to gravity, accordingly, when testing, the cable 1 with a length of 15D-30D is used as a sample, the moving distance of the second sleeve 4 during reciprocating motion is 20-30 cm, because the moving distance is short, and the supporting arm 5 pushes a small section of the cable 1 upward, the whole cable 1 does not bend and sag, and the whole cable 1 is still located on or above the line connecting the first sleeve 3 and the second sleeve 4.

[0027] As an embodiment of the utility model, the base 2 is provided with a positioning piece 6, the first sleeve 3 can be quickly positioned by the positioning piece 6, and then the fixed connection between the first sleeve 3 and the base 2 is realized. This positioning can be combined with the aforesaid rotation connection, for example, the first sleeve 3 can be hinged with the base 2, and the second sleeve 4 can be hinged with the sliding column 703. Specifically, the positioning piece 6 can be a rotating shaft, the rotating shaft is arranged on the base 2 through a bearing, a bearing seat or other structures, the rotating shaft penetrates one end of the first sleeve 3 along the radial direction, so that the rotation connection between the first sleeve 3 and the base 2 is realized, the first sleeve 3 can make one-degree-of-freedom rotary motion around the rotating shaft, and the rotary surface formed by this rotary motion is the plane where the base 2 and the cable 1 are located, this hinged structure enables the first sleeve 3 to adaptively change the angle, so as to adapt to the cable 1 with different directions or tensions, and avoid the interference caused by rigid connection.

[0028] In the embodiment, the support arm 5 is arranged on the moving end of the driving mechanism, one end of the support arm 5 is connected with the moving end of the driving mechanism to form reliable connection between the support arm 5 and the moving end of the driving mechanism, the support arm 5 extends from the moving end of the driving mechanism to the direction of the second sleeve 4, the other end of the support arm 5 abuts and lifts one position on the cable 1 from below, the support arm 5 has a supporting surface 501 which contacts and lifts the cable 1, the supporting surface 501 needs to be arranged in an arc shape, and all the other corners of the support arm 5 also adopt arc transition, through the smooth surfaces at multiple positions, damage to the surface of the cable 1 caused by sharp parts is avoided, interference with the test result is avoided, and the structure meeting the above conditions can be used as the support arm 5, and the specific structure can be designed according to requirements, which is not limited in the utility model.

[0029] As an embodiment of the utility model, as shown in Figure 3 The supporting surface 501 is in an arc shape, and the arc opening faces the direction of the cable 1, and the support arm 5 holds the cable 1 from below. Figure 4 As another embodiment of the utility model, as shown in The supporting surface 501 is in an arc shape, and the arc convex surface faces the direction of the cable 1, and the support arm 5 lifts the cable 1 from below.

[0030] As an embodiment of the utility model, as shown in Figures 1-2 The driving mechanism comprises a motor 701 and a linearly extended horizontal rail 702, the extension direction of the horizontal rail 702 is parallel to the length direction of the cable 1, the extension direction of the base 2 is perpendicular to the horizontal rail 702, and the top height of the base 2 is higher than the top height of the horizontal rail 702, a sliding column 703 is arranged on the horizontal rail 702, the sliding column 703 can slide on the horizontal rail 702, the motor 701 can drive the sliding column 703 to perform linear reciprocating motion on the horizontal rail 702, the second sleeve 4 and the support arm 5 are arranged on the sliding column 703 and move synchronously with the sliding column 703, the sliding column 703 can drive the second sleeve 4 and the support arm 5 to perform synchronous horizontal linear reciprocating motion, the second sleeve 4 and the sliding column 703 are also connected in a hinged manner (that is, similar to the connection structure between the first sleeve 3 and the base 2), so that the single-degree-of-freedom rotary motion of the second sleeve 4 is realized, and the rotary surface formed by the rotary motion is also the plane where the base 2 and the cable 1 are located.

[0031] As an embodiment of the utility model, the driving mechanism further includes a control unit 704, the control unit 704 is used to control the operation of motor 701, including the rotating speed, positive and negative rotation, operation frequency, single operation time of motor 701 and the like.Through the coordinated setting of these parameters, the control unit 704 can accurately manage the displacement, stroke rhythm and total test cycle of sliding column 703 and support arm 5, thereby meeting the requirements of various complex test procedures.

[0032] Further, the driving mechanism further includes a first sensor 705, the first sensor 705 is used to monitor the real-time moving speed of sliding column 703 and feedback to control unit 704, whether the control unit 704 judges the preset target speed, dynamically adjusts the output torque and rotating speed of motor 701, so as to keep sliding column 703 moving at a preset speed.The first sensor 705 can adopt rotary encoder, grating ruler, linear potentiometer and the like, and the type of first sensor 705 and the connection mode with other components can be designed according to actual requirements, which is not limited in the utility model.

[0033] As an embodiment of the utility model, the driving mechanism further includes a second sensor 706, the second sensor 706 is used to monitor the position of sliding column 703 on horizontal rail 702 and feedback to control unit 704, judges whether the reciprocating motion of sliding column 703 on horizontal rail 702 reaches the preset limit position, prevents rigid collision damage due to overshoot, ensures the safety of the equipment, and the control unit 704 can automatically execute the reversing logic according to the signal of second sensor 706, realizes complete automatic reciprocating motion cycle.The second sensor 706 can adopt photoelectric sensor, proximity switch, travel switch and the like, and the type of second sensor 706 and the connection mode with other components can be designed according to actual requirements, which is not limited in the utility model.

[0034] As an embodiment of the utility model, a rotating part is arranged between support arm 5 and sliding column 703, the rotating part is used to adjust the elevation angle of support arm 5, allows support arm 5 to rotate around its hinge shaft (or other rotating center) and position, so that the elevation angle of support arm 5 can be continuously or step-adjusted, when the elevation angle of support arm 5 changes, the relative height between the stress point of support arm 5 lifting cable 1 and the horizontal reference plane also changes, thereby controlling the height of support arm 5 lifting cable 1, improving the applicability of test device to different tension, different diameter cable 1 and test requirements.

[0035] As an embodiment of the utility model, the elastic arc plate 8 is arranged on the horizontal track 702, the arc opening of the elastic arc plate 8 faces the horizontal track 702, and the upward arching shape is formed.The one end of the elastic arc plate 8 abuts against the base 2, the other end abuts against the sliding vertical column 703, the highest point of the elastic arc plate 8 abuts against the cable 1, and the elastic arc plate 8 is used to provide the upward arching support force for the cable 1 and limit the arching shape of the cable 1.Specifically, the two ends of the elastic arc plate 8 can be fixedly connected with the base 2 and the sliding vertical column 703 respectively and provide a certain rotating space, or a horizontal support member can be arranged on the horizontal track 702 to support the elastic arc plate 8, and the accommodation slot for the sliding vertical column 703, the support arm 5 and other structures is formed in the horizontal support member.

[0036] The elastic arc plate 8 is a metal thin plate with elasticity, is pre-processed into an arc shape with a certain curvature, and abuts against the cable 1 in the initial state.When the motor 701 drives the sliding vertical column 703 to move towards the base 2, the support arm 5 provides an initial deformation force for the cable 1 to lift the cable 1, the sliding vertical column 703 pushes the elastic arc plate 8, the other end of the elastic arc plate 8 abuts against the base 2, the sliding vertical column 703 applies a force to the elastic arc plate 8 in the direction of the base 2, the elastic arc plate 8 bends and the curvature increases, the elastic arc plate 8 bends upwards, that is, the height of the upward arching increases, and in this process, the elastic arc plate 8 that bends upwards continuously applies an increasing and upward distributed support force to the cable 1, guides and restricts the shape of the cable 1 to gradually and accurately approach the current arch shape of the elastic arc plate 8, so that the tested section of the cable 1 can form and maintain an approximately circular arc and high consistency arching shape in the whole test process regardless of the stretching state, and as the sliding vertical column 703 gradually moves towards the base 2, the height of the upward arching of the cable 1 gradually increases, the support arm 5 gradually separates from the cable 1, and in the later stage of movement, the cable 1 is mainly supported by the elastic arc plate 8.

[0037] When the motor 701 drives the sliding vertical column 703 to move away from the base 2, the elastic arc plate 8 gradually resets due to the elasticity of the elastic arc plate 8, the arching height slowly decreases, and the initial pre-arch shape is restored, in this process, the height of the upward arching of the cable 1 gradually decreases, and the cable 1 gradually contacts the support arm 5.

[0038] Through the constraint of the elastic arc plate 8, the cable 1 can be actively guided to form a predetermined shape, random and asymmetric deformation of the cable 1 due to insufficient rigidity or uneven stress is effectively avoided, the normativity and consistency of the test sample shape are ensured, and continuous and uniform support is provided during the test, stress concentration points are reduced, and the surface of the cable 1 is protected from damage.

[0039] As an embodiment of the utility model, a camera 9 is arranged above the elastic arc plate 8, the camera 9 is used for observing the cable 1, can intuitively and completely record the whole process of the cable 1 from starting to deform to appearing micro-cracks to crack propagation, accurately position the accurate moment of cracking and the arching height or stretching degree of the cable 1 at the moment, provide direct data for testing, compared with the traditional mode of relying on human eye observation and subjective judgment, the objectivity, repeatability and comparability of test results are improved.

[0040] Based on the above cable anti-cracking test device, a plurality of cables 1 and first sleeves 3, second sleeves 4 and support arms 5 matched with the cables 1 can be arranged, the plurality of cables 1 are arranged side by side, the first sleeves 3 are fixed on the base 2 side by side, the second sleeves 4 are arranged on the sliding column 703 side by side, and the support arms 5 are also arranged on the sliding column 703 side by side, so that the synchronous comparison test of the plurality of cables 1 can be carried out.

[0041] Based on the above test device, the test steps are as follows:

[0042] 1. Take a length of the cable 1 as a test sample;

[0043] 2. Select appropriate first sleeves 3 and second sleeves 4 according to the diameter of the cable 1, and insert the two ends of the cable 1 into the first sleeves 3 and the second sleeves 4 respectively;

[0044] 3. The support surface 501 of the support arm 5 abuts against the lower surface of the cable 1 to lift the cable 1 to a certain degree of curvature, and the top surface of the elastic arc plate 8 abuts against the lower surface of the cable 1 to preliminarily support and shape the cable 1;

[0045] 4. Set programs in the control unit 704, set displacement speed, back-and-forth position, running times, and camera 9 sampling frequency;

[0046] 5. Start the program, when displacing for the first time, observe whether the displacement of the support arm 5 and the deformation curvature of the elastic arc plate 8 are normal, if normal, continue to run the program, and identify and judge the appearance of the cable 1 within the specified test times;

[0047] 6. After the test is completed, stop the running program, and when the sliding column 703 returns to the original position, open the first sleeve 3 and the second sleeve 4, remove the cable 1, and reset the elastic arc plate 8.

[0048] The cable anti-cracking test device provided by the utility model provides an initial deformation force for the cable 1 through the support arm 5, and then uses the elastic arc plate 8 to constrain the deformation of the cable 1, and the two are combined to assist in positioning the bending direction and angle of the cable 1, simulate the actual operation condition of the cable 1 in reciprocating motion, and can quickly, intuitively and effectively perform failure analysis on the cable 1, and the structure is simple and convenient to operate, and meanwhile, the cable anti-cracking test device can also be applied to other plastic products, for example, drainage pipes and gas pipelines, and is suitable for failure analysis of such products and has wide applicability.

[0049] It should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0050] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the utility model, and they are not used to limit the protection scope of the utility model, and equivalent embodiments or changes made without departing from the spirit of the utility model art should be included in the protection scope of the utility model.

Claims

1. A cable anti-cracking test device, characterized in that: comprising a base (2) and a driving mechanism, a first sleeve (3) for fixing one end of a cable (1) is arranged on the base (2), the first sleeve (3) is rotationally connected with the base (2), a second sleeve (4) for fixing the other end of the cable (1) is connected with the moving end of the driving mechanism, the second sleeve (4) is rotationally connected with the moving end of the driving mechanism, a support arm (5) is arranged on the moving end of the driving mechanism, the support arm (5) can lift the cable (1) from below so that the cable (1) is arched upward, and the driving mechanism can drive the second sleeve (4) and the support arm (5) to synchronously move reciprocatingly along the length direction of the cable (1).

2. The cable anti-cracking test device according to claim 1, characterized in that: one end of the support arm (5) is connected with the moving end of the driving mechanism, the other end abuts against and lifts the cable (1) from below, and the surface of the support arm (5) in contact with the cable (1) is arc-shaped.

3. The cable anti-cracking test device according to claim 2, characterized in that: a rotating part is arranged on the moving end of the driving mechanism, and the rotating part is used for adjusting the elevation angle of the support arm (5).

4. The cable anti-cracking test device according to claim 1, characterized in that: the driving mechanism comprises a motor (701) and a linearly extended horizontal rail (702), the extension direction of the base (2) is perpendicular to the horizontal rail (702), a sliding column (703) is arranged on the horizontal rail (702), the motor (701) can drive the sliding column (703) to reciprocatingly move on the horizontal rail (702), and the support arm (5) and the second sleeve (4) are arranged on the sliding column (703).

5. The cable anti-cracking test device according to claim 4, characterized in that: the driving mechanism further comprises a control unit (704), and the control unit (704) is used for controlling the operation of the motor (701).

6. The cable anti-cracking test device according to claim 5, characterized in that: the driving mechanism further comprises a first sensor (705), and the first sensor (705) is used for monitoring the moving speed of the sliding column (703) and feeding back to the control unit (704).

7. The cable anti-cracking test device according to claim 5, characterized in that: the driving mechanism further comprises a second sensor (706), and the second sensor (706) is used for monitoring the position of the sliding column (703) on the horizontal rail (702) and feeding back to the control unit (704).

8. The cable anti-cracking test device according to claim 4, characterized in that: an elastic arc plate (8) is arranged on the horizontal rail (702), the arc-shaped opening of the elastic arc plate (8) faces the horizontal rail (702), one end of the elastic arc plate (8) abuts against the base (2) and the other end abuts against the sliding column (703), and the elastic arc plate (8) is used for providing an upward arching support force for the cable (1) and limiting the arching shape of the cable (1). ​ ​ ​ ​ ​ ​ ​ ​ 9. The cable anti-cracking test device according to claim 8, characterized in that: A camera (9) is arranged above the elastic arc plate (8), and the camera (9) is used to observe the cable (1).

10. The cable anti-cracking test device according to claim 4, characterized in that: The first sleeve (3) is hinged with the base (2), and the second sleeve (4) is hinged with the sliding column (703).

Images