A detection device for testing pressure resistance performance of a cable

Abstract

The application relates to the technical field of cable detection and belongs to a detection device for testing the pressure resistance of a cable. The device comprises a detection table, a fixed support connected to the detection table, a sliding support connected to the fixed support in a sliding mode, a hydraulic push rod connected to the fixed support, a pressure block connected to the extension end of the hydraulic push rod, the pressure block being located above the fixed support, a missing tooth ring arranged on the detection table, two connecting plates symmetrically connected to the missing tooth ring, and a swing support connected to the two connecting plates in a rotating mode. The swing support swings in two directions, and the pressure block extrudes the cable, so that the state of the cable under the combined mechanical stress is simulated. The test results of the cable under the pressure test in the state can reflect the insulation performance evolution of the cable under the dynamic mechanical stress, and the new cable applied to the joint of an industrial robot can provide reference value and reliable data.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable detection, and in particular to a detection device for testing the pressure resistance performance of a cable. BACKGROUND

[0002] The pressure resistance test simulates the overvoltage condition that the cable may encounter in actual operation by applying a test voltage much higher than the rated working voltage of the cable for a certain period of time, and the purpose is to actively expose potential defects in the cable insulation, which may be caused by the manufacturing process (such as impurities, air gap, uneven insulation thickness), or damage caused by transportation, laying and installation (such as damage to the outer sheath, resulting in insulation dampness, mechanical damage), if the insulation is broken down or flashover occurs under the test voltage, it means that the insulation strength is not enough to withstand the possible overvoltage, i.e. the cable is no longer used, avoiding catastrophic failures of the cable after it is put into operation.

[0003] However, the deformation caused by external forces such as twisting and extrusion during the actual use of the cable will cause fatigue, micro-cracks, deformation and even local damage to the insulation material, and these damages caused by mechanical stress will significantly reduce the actual insulation strength of the cable, thereby causing unexpected cable failures, especially the cables applied in the joints of robots, which will be subjected to bending, twisting and extrusion during use, which will significantly reduce the actual insulation strength, and the existing standard pressure resistance test is only carried out under the condition that the cable is in a static state without running stress (such as after manufacture, laying and installation, before operation), and the test result mainly reflects the insulation integrity of the cable in the "initial static state", and cannot evaluate the insulation performance evolution under dynamic mechanical stress, and for the development of new cables applied in harsh dynamic environments such as industrial robot joints, only relying on the standard pressure resistance test data for design and verification, the reference value and reliability are poor. SUMMARY

[0004] The present application provides a detection device for testing the pressure resistance performance of a cable to overcome the shortcomings that the data provided by the existing cable standard pressure resistance test has poor reference value and reliability for the development of new cables.

[0005] The technical scheme is as follows: a detection device for testing the pressure resistance of a cable, comprising a detection table, a fixed support fixedly connected to the detection table, a sliding support slidingly connected to the fixed support, a hydraulic push rod fixedly connected to the fixed support, a pressure block fixedly connected to the extension end of the hydraulic push rod, the pressure block being located above the fixed support, a toothless ring provided on the detection table, two connecting plates symmetrically distributed and fixedly connected to the toothless ring, an oscillating support rotatably connected to the two connecting plates, the oscillating support being located on the side of the sliding support away from the fixed support, the upper sides of the fixed support, the sliding support and the oscillating support being used for placing a cable to be detected, the rotation axis of the toothless ring being perpendicular to the rotation axis of the oscillating support, so that the oscillating support can oscillate in two directions, a high-voltage generator provided on the detection table, and a power assembly provided on the detection table and used for driving the toothless ring and the oscillating support to rotate.

[0006] Further, the sliding support is in contact with the oscillating support, and a spring is fixedly connected between the fixed support and the sliding support, the spring being used for maintaining the contact state of the sliding support and the oscillating support.

[0007] Further, the power assembly comprises two rollers, a torsion motor, a first gear, a toothless gear, a bending motor and a second gear, the rollers being rotatably connected to the detection table, the outer circumferential side of the toothless ring being provided with an arc-shaped groove, the rollers sliding in the arc-shaped groove, the torsion motor being fixedly connected to the detection table, the first gear being fixedly connected to the output shaft of the torsion motor and engaged with the toothless ring, the first gear and the rollers being respectively located on the inner and outer sides of the toothless ring and limiting the toothless ring, the toothless gear being fixedly connected to the oscillating support, the rotation axis of the toothless gear being collinear with the rotation axis of the oscillating support, the bending motor being fixedly connected to the toothless ring, and the second gear being fixedly connected to the output shaft of the bending motor and engaged with the toothless gear.

[0008] Further, the rotation axis of the toothless ring intersects with the rotation axis of the oscillating support, and the intersection point of the two axes is located on the upper side of the oscillating support.

[0009] Further, the device further comprises a flexible fixing assembly provided on the side of the oscillating support away from the fixed support and used for fixing the free end of the cable, the flexible fixing assembly comprising two mounting frames symmetrically distributed, an adjusting screw and a plurality of fastening belts, the mounting frames being slidingly connected to the oscillating support, the mounting frames being threadedly connected to the adjusting screw, the number of the fastening belts being even and being equally divided into two groups, the two groups of the fastening belts being oppositely directed and staggeredly distributed, all the fastening belts in the same group being equally spaced, and the two ends of each fastening belt being fixedly connected to the adjacent mounting frames.

[0010] Further, the inner side of the fastening belt is provided with a rubber layer.

[0011] Further, in the vertical direction, the distance between the two ends of the fastening belt is less than the maximum distance between the upper and lower sides.

[0012] Further, all the fastening belts in the same group are fixedly connected with a support, and the support is in sliding connection with the adjacent mounting frame.

[0013] Further, the limiting and fixing assembly is arranged on the side of the fixed support away from the swing support and used for providing fixation for the wiring end of the cable; the limiting and fixing assembly comprises two mounting rings symmetrically distributed, a plurality of fastening rods, a flexible sleeve and a fastening motor, both the mounting rings are in rotational connection with the fixed support, all the fastening rods are divided into two groups, the fastening rods in the two groups are fixedly connected to the opposite sides of the two mounting rings, the fastening rods in the two groups are staggered, the flexible sleeve is sleeved on all the fastening rods, the flexible sleeve is provided with annularly distributed accommodating portions and annularly distributed wrapping portions, the number of the fastening rods in one group is the same as the number of the accommodating portions and the wrapping portions, three accommodating portions and three wrapping portions are staggered, three fastening rods in the same group are located in three wrapping portions respectively, the fastening motor is fixedly connected with the fixed support, both the mounting rings and the output shaft of the fastening motor are in transmission through a bevel gear set, so as to make the two mounting rings rotate reversely.

[0014] Further, the limiting and fixing assembly is arranged on the side of the fixed support away from the swing support and used for providing fixation for the wiring end of the cable; the limiting and fixing assembly comprises two mounting rings symmetrically distributed, a plurality of fastening rods, a flexible sleeve and a fastening motor, both the mounting rings are in rotational connection with the fixed support, all the fastening rods are divided into two groups, the fastening rods in the two groups are fixedly connected to the opposite sides of the two mounting rings, the fastening rods in the two groups are staggered, the flexible sleeve is sleeved on all the fastening rods, the flexible sleeve is provided with annularly distributed accommodating portions and annularly distributed wrapping portions, the number of the fastening rods in one group is the same as the number of the accommodating portions and the wrapping portions, three accommodating portions and three wrapping portions are staggered, three fastening rods in the same group are located in three wrapping portions respectively, the fastening motor is fixedly connected with the fixed support, both the mounting rings and the output shaft of the fastening motor are in transmission through a bevel gear set, so as to make the two mounting rings rotate reversely.

[0015] Compared with the prior art, the application has the following advantages: the swing support swings in two directions and the pressing block extrudes the cable, so that the state of the cable under the combined mechanical stress is simulated, and the result obtained by the pressure test on the cable in this state can reflect the insulation performance evolution of the cable under the dynamic mechanical stress, so as to provide reference value and high-reliability data for the development of the new cable applied to the joint of the industrial robot.

[0016] By maintaining the intersection of the rotation axes of the swing support in two directions at the upper side of the swing support, the two fixed points of the cable are kept at the total length of the upper side of the fixed support and the swing support, preventing the swing of the swing support from bringing additional tensile or compressive stress to the cable, and keeping the reliability of the test results.

[0017] The flexible fastening belt is used to fix the cable, so that the extrusion force of the fastening belt on the cable is consistent, the probability of stress concentration at the cable fixing position is reduced, the probability of deformation at the cable fixing position is further reduced, and the influence on the insulation performance of the cable is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the fixed support and the swing support of the present application;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the missing tooth ring and the missing tooth gear of the present application;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the swing support and the missing tooth gear of the present application;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the mounting bracket and the adjusting screw of the present application;

[0023] Figure 6 It is an exploded view of the mounting bracket, the fastening belt and the support of the present application;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the fixed support and the flexible sleeve of the present application;

[0025] Figure 8 It is an exploded view of the mounting ring, the fastening rod and the flexible sleeve of the present application;

[0026] Figure 9 It is a schematic diagram of the three-dimensional structure of the fastening belt and the mounting member of the present application.

[0027] The marks of the components in the drawings are as follows: 1-detection table, 2-fixed support, 3-sliding support, 4-hydraulic push rod, 5-pressing block, 6-missing tooth ring, 601-arc-shaped groove, 7-connection plate, 8-swing support, 9-roller, 10-torsion motor, 11-first gear, 12-missing tooth gear, 13-bending motor, 14-second gear, 15-mounting bracket, 16-adjusting screw, 17-fastening belt, 18-support, 19-mounting ring, 20-fastening rod, 21-flexible sleeve, 211-receiving part, 212-wrapping part, 22-fastening motor, 23-mounting member, 24-connecting rod, 25-limiting plate, 251-limiting teeth, 26-extrusion block. DETAILED DESCRIPTION

[0028] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art on examination of the specification or by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0029] Embodiment 1

[0030] The embodiment provides a detection device for testing the pressure resistance performance of a cable, so as to simulate the state of the cable in actual operation, and to carry out a pressure test on the basis, thereby providing a new type of cable development with reference value and high reliability data.

[0031] Referring to Figures 1 to 4 A detection device for testing the pressure resistance performance of a cable, comprising: a detection table 1, the detection table 1 is fixedly connected with a fixed support 2, the left side of the fixed support 2 is slidably connected with a sliding support 3, the fixed support 2 is fixedly connected with a hydraulic push rod 4 through a support, the extension end of the hydraulic push rod 4 is fixedly connected with a pressing block 5, the pressing block 5 is located above the fixed support 2, and the pressing block 5 is used for extruding the cable to apply extrusion force to the cable; the detection table 1 is provided with a toothless ring 6, the toothless ring 6 is fixedly connected with two symmetrical connecting plates 7, the two connecting plates 7 are jointly rotatably connected with an oscillating support 8, the oscillating support 8 is located on the left side of the sliding support 3 and in contact with the sliding support 3, the upper sides of the fixed support 2, the sliding support 3 and the oscillating support 8 are used for placing a cable to be detected, the rotation axis of the toothless ring 6 is perpendicular to the rotation axis of the oscillating support 8, so that the oscillating support 8 can oscillate in two directions, a high-voltage generator is arranged on the detection table 1, the output end of the high-voltage generator is electrically connected with the right end of a to-be-tested battery in the cable, the left end of the to-be-tested battery is suspended, and the remaining batteries in the cable are all in a grounded state; the detection table 1 is provided with a power assembly for driving the toothless ring 6 and the oscillating support 8 to rotate.

[0032] The above arrangement can realize the oscillation of the oscillating support 8 in two directions and the extrusion of the pressing block 5 to the cable, simulate the state of the cable under combined mechanical stress, and carry out a pressure test on the cable in this state, so that the obtained result can reflect the insulation performance evolution of the cable under dynamic mechanical stress, thereby providing a new type of cable development applied to the joint of an industrial robot with reference value and high reliability data.

[0033] It should be noted that the bolt herein is only schematic, and the threads thereon are not specifically shown; in the embodiment, the two ends of the cable are fixed on the fixed support 2 and the oscillating support 8 by existing fixing modes (for example, cable clamps, straps, clamps and the like).

[0034] Referring to Figure 4The fixed support 2 is fixedly connected with the sliding support 3 and a spring that always stores force, the spring is used for maintaining the contact state of the sliding support 3 and the swing support 8, preventing the cable middle part from being in a suspended state, providing sufficient support for the cable middle part, making the cable deform in its own regularity, and improving the reliability and referenceability of the test result.

[0035] Referring to Figures 2 to 4 The power assembly comprises two rollers 9, a torsion motor 10, a first gear 11, a missing tooth gear 12, a bending motor 13 and a second gear 14. Figure 3 The detection table 1 is provided with a support, the two rollers 9 are rotationally connected with the support on the detection table 1, the outer circumferential side of the missing tooth ring 6 is provided with an arc-shaped groove 601, the roller 9 slides in the arc-shaped groove 601, and the length of the roller 9 is equal to the width of the arc-shaped groove 601 in the left-right direction, so as to limit the axial movement of the missing tooth ring 6; the torsion motor 10 is fixedly connected with the detection table 1 through the support, the first gear 11 is fixedly connected with the output shaft of the torsion motor 10 and meshes with the missing tooth ring 6, the first gear 11 and the roller 9 are located on the inner and outer sides of the missing tooth ring 6 respectively and limit the missing tooth ring 6, and the first gear 11 and the two rollers 9 jointly provide three-point support for the missing tooth ring 6; the missing tooth gear 12 is fixedly connected with the right part of the lower side of the swing support 8, the rotation axis of the missing tooth gear 12 is collinear with the rotation axis of the swing support 8, the bending motor 13 is fixedly connected with the missing tooth ring 6 through the support, and the second gear 14 is fixedly connected with the output shaft of the bending motor 13 and meshes with the missing tooth gear 12; the rotation axis of the missing tooth ring 6 intersects with the rotation axis of the swing support 8, and the intersection point of the two is located on the upper side of the swing support 8.

[0036] The above arrangement can realize that the intersection point of the rotation axes of the swing support 8 in the two directions is maintained on the upper side of the swing support 8, the total length of the two fixed points of the cable on the upper sides of the fixed support 2 and the swing support 8 is unchanged, the swing of the swing support 8 is prevented from bringing additional tensile or compressive stress to the cable, and the reliability of the test result is maintained.

[0037] The flow after the above arrangement is as follows: the cable to be detected is passed through the support provided with the hydraulic push rod 4 and placed on the middle part of the upper sides of the fixed support 2, the sliding support 3 and the swing support 8, the left and right ends of the cable are fixed on the swing support 8 and the fixed support 2 respectively, and the cable is kept in a straight state; the output end of the high-voltage generator is electrically connected with the right end of the measured battery in the cable, and the remaining batteries in the cable are grounded, and then the swing angle of the swing support 8 in the two directions and the extrusion force of the pressing block 5 on the cable are set according to the movement state of the joint of the industrial robot.

[0038] Start the high-voltage generator, turn on the bending motor 13 and the twisting motor 10, the output shaft of the bending motor 13 drives the left end of the swing support 8 to swing upward through the second gear 14 and the cogwheel 12, the output shaft of the twisting motor 10 drives the cogwheel 6 to rotate through the first gear 11, the cogwheel 6 drives the left end of the swing support 8 to swing forward through the connecting plate 7, in the process of swinging in two directions, the swing support 8 and the sliding support 3 form an angle, the cable is bent and twisted under the influence of its own structure, after the swing support 8 swings to the set angle, the bending motor 13 and the twisting motor 10 are reversed, until the swing support 8 resets and the cable shape on it recovers.

[0039] Turn on the hydraulic push rod 4, the telescopic end of the hydraulic push rod 4 extends and drives the pressing block 5 to move downward, so that the pressing block 5 contacts the cable and exerts downward extrusion force on the cable, until the extrusion force reaches the set value, the telescopic end of the hydraulic push rod 4 retracts and drives the pressing block 5 to move upward, so that the pressing block 5 releases the extrusion on the cable; turn on the hydraulic push rod 4, the twisting motor 10 and the bending motor 13 until they are finally reset and record as a cycle, the on-off sequence of the hydraulic push rod 4, the twisting motor 10 and the bending motor 13 is determined according to the action sequence of the industrial robot joint.

[0040] Repeat the above steps of bending, twisting and extruding the cable until the cable appears insulation breakdown or flashover, at which time stop the high-voltage generator, the hydraulic push rod 4, the twisting motor 10 and the bending motor 13, and record the number of cycles of the hydraulic push rod 4, the twisting motor 10 and the bending motor 13, then release the fixation of both ends of the cable and replace the remaining cable to retest, so as to evaluate the voltage resistance performance of different types or different materials of cables applied in the industrial robot joint, and the test data is used as a reference for the development of new cables, which has higher reference value and reliability.

[0041] Example 2

[0042] In this embodiment, on the basis of example 1, a new cable fixing method is provided to solve the problem of local stress concentration of the cable caused by the traditional cable fixing method and reduce the impact of the fixing method on the insulation performance of the cable.

[0043] Referring to Figure 2 , Figure 5 , Figure 6 and Figure 9Further comprising: a flexible fixing assembly arranged on the left side of the swing support 8 and used for providing fixation for the free end of the cable, the flexible fixing assembly comprising: two mounting racks 15 symmetrically distributed, an adjusting screw rod 16 and six fastening belts 17, the material of the fastening belts 17 having the characteristics of low yield strength, low bending strength and high tensile strength, so that after the fastening belts 17 are bent and attached to the periphery of the cable, the elastic force accumulated by the fastening belts 17 due to deformation is small, and then the extrusion force provided by the fastening belts 17 to the cable at each position where the fastening belts 17 are attached to the cable tends to be consistent, and the low-carbon steel after annealing treatment is selected here; the two mounting racks 15 are respectively in sliding connection with the front and rear sides of the swing support 8, the adjusting screw rod 16 is provided with two groups of threads symmetrically distributed, the two mounting racks 15 are respectively in threaded connection with the adjusting screw rod 16 through the two groups of threads on the adjusting screw rod 16, and the distance between the two mounting racks 15 is controlled to be larger or smaller through the adjusting screw rod 16; the number of the fastening belts 17 and the width of a single fastening belt 17 in the left-right direction can be determined according to the roughness of the surface of the cable and the hardness of the cable, if the surface of the cable is smooth, the number of the fastening belts 17 is appropriately increased, and vice versa, if the hardness of the cable is small, the width of the fastening belts 17 in the left-right direction is reduced, so that the stress at the contact position of the fastening belts 17 and the cable is more uniform; the fastening belts 17 are divided into two groups, and the two groups of fastening belts 17 are oppositely directed and staggered, so that the two adjacent fastening belts 17 provide opposite extrusion force to the cable; all the fastening belts 17 in the same group are equally spaced, the mounting rack 15 is provided with two pressing plates symmetrically distributed upward and downward, and the mounting rack 15 is fixedly connected with the two ends of the fastening belts 17 through the two pressing plates thereon; the inner side of the fastening belt 17 is provided with a rubber layer to increase the friction coefficient between the fastening belt 17 and the cable, thereby increasing the friction force between the fastening belt 17 and the cable and improving the stability of the cable during the bending process.

[0044] The above arrangement can realize the fixation of the cable by the flexible fastening belts 17, so that the extrusion force of the fastening belts 17 to the cable at each position tends to be consistent, the probability of stress concentration at the fixed position of the cable is reduced, the probability of deformation at the fixed position of the cable is further reduced, and the influence on the insulation performance of the cable is reduced.

[0045] Referring to Figure 5 and Figure 6 , all the fastening belts 17 in the same group are fixedly connected with a support 18, the support 18 is in sliding connection with the adjacent mounting rack 15, the force of the deformation of the fastening belt 17 is greater than the force of the sliding of the support 18 in the mounting rack 15, the bending strength of the material of the fastening belt 17 is reduced on the premise that the support 18 can be reset, and the force dispersed to the side of the cable after the cable is wrapped by the fastening belt 17 is more uniform.

[0046] The above arrangement can achieve that the position of the middle part of the fastening belt 17 is limited by the support 18, all the fastening belts 17 are at the same height, the influence of the gravity of the fastening belt 17 on the position is reduced, and the fastening belt 17 is divided into two parts, which is convenient for the cable to be inserted into the fastening belt 17.

[0047] Referring to Figure 6 In the vertical direction, the distance between the two ends of the fastening belt 17 is less than the maximum distance between the upper and lower sides of the fastening belt 17, so that the range of the fastening belt 17 wrapping the cable is increased.

[0048] The above fixing process of the cable is as follows: after the cable is placed on the swing support 8, the left end of the cable is inserted through all the fastening belts 17, then the adjusting screw 16 is rotated, the adjusting screw 16 drives the two mounting frames 15 to move, so that the distance between the two mounting frames 15 is increased (hereinafter, the mounting frame 15 on the front side and the fastening belt 17 fixed to the mounting frame 15 are taken as examples for description), the mounting frame 15 drives the adjacent three fastening belts 17 to move forward, the three fastening belts 17 drive the support 18 to move forward together, the distance between the inner side of the fastening belt 17 and the cable is gradually reduced, and finally the inner side of the fastening belt 17 contacts the rear side of the cable, at this time the support 18 stops moving, as the mounting frame 15 continues to move forward, the mounting frame 15 drives the end of the fastening belt 17 to move forward, the fastening belt 17 deforms and adheres to the outer circumferential side of the cable, until the fastening belt 17 cannot continue to deform, the mounting frame 15 continues to move forward to increase the extrusion force of the fastening belt 17 on the cable, until the fixing force of the cable is appropriate (here, appropriate means that the cable does not slide relative to the fastening belt 17 in the process of bending and twisting), and then the adjusting screw 16 is stopped.

[0049] After the detection of a single cable is completed, the adjusting screw 16 is reversely rotated, the adjusting screw 16 drives the mounting frame 15 to move backward, the mounting frame 15 drives the end of the fastening belt 17 to move backward, the three fastening belts 17 jointly drive the support 18 to move backward, until the support 18 is reset, as the mounting frame 15 continues to move backward, the support 18 limits the position of the middle part of the fastening belt 17, so that the part of the fastening belt 17 above the support 18 is arched upward, and the part of the fastening belt 17 below the support 18 is concave downward, so that the fastening belt 17 is relaxed, the distance between the upper and lower sides of the fastening belt 17 is increased, and then it is convenient for the cable to be inserted into the fastening belt 17.

[0050] It should be noted that in the embodiment, the cable to be detected is a three-core cable.

[0051] Referring to Figure 2 , Figure 7 and Figure 8Further comprising: a limiting rotation fixing assembly arranged on the right side of the fixed support 2 and used for providing fixation for the wiring end of the cable, the limiting rotation fixing assembly comprising: two mounting rings 19 symmetrically distributed, six fastening rods 20, a flexible sleeve 21 and a fastening motor 22, the fixed support 2 is provided with a bracket, the bracket is rotationally connected with the two mounting rings 19, the six fastening rods 20 are divided into two groups, the two groups of fastening rods 20 are respectively fixedly connected to the opposite sides of the two mounting rings 19, the two groups of fastening rods 20 are staggered, the flexible sleeve 21 is sleeved on all the fastening rods 20, the flexible sleeve 21 is provided with three accommodating portions 211 and three wrapping portions 212 arranged in a ring shape, the three accommodating portions 211 and the three wrapping portions 212 are staggered, the accommodating portion 211 is used for accommodating the core of the cable, and the wrapping portion 212 is used for deforming to the two sides and wrapping the adjacent core; the three fastening rods 20 in the same group of fastening rods 20 are respectively located in the three wrapping portions 212, the fastening motor 22 is fixedly connected with the fixed support 2 through the bracket, and the two mounting rings 19 and the output shaft of the fastening motor 22 are both driven through a bevel gear set (the bevel gear set is an existing structure, and specific display is not made in the drawings), so as to make the two mounting rings 19 rotate in opposite directions.

[0052] The above arrangement can realize that the three cores inside the cable are separated by the flexible sleeve 21, the cable is fixed by the way that the flexible sleeve 21 wraps the core, and then the three cores are clamped by the flexible sleeve 21 after being pulled out by the fastening rod 20, so as to prevent the rotation of the cable. In this way, the cable is not simply fixed by relying on the extrusion force, the probability of stress concentration at the fixed position of the cable is reduced, and the influence of the fixed position of the cable on the overall insulation strength is reduced.

[0053] The above fixing process of the cable: the three cores at the right end of the cable are separated, the three cores are respectively inserted into the adjacent accommodating portions 211, and the whole cable is pushed to the right, so that the flexible sleeve 21 moves to the left relative to the core of the cable, the flexible sleeve 21 is clamped into the gap between the three cores, and the cable is stopped after the cable cannot continue to move to the right; the fastening motor 22 is started, the fastening motor 22 drives the two mounting rings 19 to rotate in opposite directions through the bevel gear set, the mounting ring 19 drives the three fastening rods 20 thereon to rotate, the two fastening rods 20 in the same wrapping portion 212 move in opposite directions and gradually expand the wrapping portion 212, so that the wrapping portion 212 gradually wraps the side surfaces of the adjacent two cores, and the fastening motor 22 is stopped after the wrapping portion 212 cannot continue to deform, and thus the fixing of the right end of the cable is completed.

[0054] After the single cable test is completed, the fastening motor 22 is started in the opposite direction, the extrusion of the flexible sleeve 21 by the fastening rod 20 is released, and the flexible sleeve 21 restores its shape under the elastic force of itself. At this time, the core is pulled out from the accommodating portion 211.

[0055] Embodiment 3

[0056] This embodiment is used to simulate the fixed position of the cable at the joint of the industrial robot, and test the influence of different bending radii on the pressure resistance performance.

[0057] Referring to Figures 1 to 4 and Figure 9 Further comprising: a regulating assembly arranged on the swing support 8 and used for adjusting the bending amplitude of the cable, the regulating assembly comprising: a mounting piece 23, a connecting rod 24, a limiting plate 25 and a pressing block 26, the swing support 8 is fixedly connected with a bracket, the bracket is rotationally connected with the mounting piece 23, and a torsional spring is fixedly connected between the mounting piece 23 and the bracket thereof, the connecting rod 24 is slidingly connected with the mounting piece 23, the right side of the connecting rod 24 is fixedly connected with the limiting plate 25, the mounting piece 23, the connecting rod 24 and the limiting plate 25 are all symmetrically distributed in front and back, so that the stress of the pressing block 26 is more uniform; the limiting plate 25 is in contact with the swing support 8, and equidistantly distributed limiting teeth 251 are arranged on the contact surfaces of the limiting plate 25 and the swing support 8, the limiting teeth 251 are used for limiting the limiting plate 25, and limiting the movement of the limiting plate 25 in the left and right directions, the pressing block 26 is fixedly connected with the limiting plate 25, and the pressing block 26 is used for fixing the cable.

[0058] The above arrangement can realize the limiting of the cable by the pressing block 26, and then change the bending radius of the cable, and test the influence of different bending radii on the pressure resistance performance of the cable.

[0059] The process of adjusting the position of the pressing block 26 to change the bending radius of the cable is as follows: the pressing block 26 is pulled upward, the pressing block 26 drives the connecting rod 24 and the limiting plate 25 to swing, the limiting plate 25 loses contact with the limiting teeth 251 on the swing support 8, the connecting rod 24 drives the mounting piece 23 to rotate, and the torsional spring of the mounting piece 23 is twisted, then the pressing block 26 is moved to a predetermined position, then the pressing block 26 is moved downward, the limiting plate 25 re-contacts with the limiting teeth 251 on the swing support 8, and the pressing block 26 is limited in the left and right directions; in the process of moving the pressing block 26, the pressing block 26 drives the connecting rod 24 and the mounting piece 23 to slide through the limiting plate 25, so as to change the relative position of the pressing block 26 on the swing support 8, and then change the maximum bending radius of the cable when bending.

[0060] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A testing device for testing pressure resistance of a cable, characterized in that, Include: The detection platform (1) is fixed with a fixed support (2), the sliding support (3) is connected with the sliding support (2), the fixed support (2) is fixed with a hydraulic push rod (4), the telescopic end of the hydraulic push rod (4) is fixed with a pressure block (5), the pressure block (5) is located above the fixed support (2), the detection platform (1) is provided with a missing tooth ring (6), the missing tooth ring (6) is fixed with two symmetrical connecting plates (7), two connecting plates (7) are rotatably connected with a swing support (8), the swing support (8) is located on the side of the sliding support (3) away from the fixed support (2), the upper side of the fixed support (2), the sliding support (3) and the swing support (8) is used for placing the cable to be detected, the rotation axis of the missing tooth ring (6) is perpendicular to the rotation axis of the swing support (8), so that the swing support (8) can swing in two directions, the detection platform (1) is provided with a high voltage generator, the detection platform (1) is provided with a power assembly for driving the missing tooth ring (6) and the swing support (8) to rotate; The power assembly comprises: Two rollers (9), a torsion motor (10), a first gear (11), a missing tooth gear (12), a bending motor (13) and a second gear (14), the roller (9) is rotatably connected with the detection platform (1), the outer periphery of the missing tooth ring (6) is provided with an arc groove (601), the roller (9) slides in the arc groove (601), the torsion motor (10) is fixed with the detection platform (1), the first gear (11) is fixed with the output shaft of the torsion motor (10) and is engaged with the missing tooth ring (6), the first gear (11) and the roller (9) are located on the inner and outer sides of the missing tooth ring (6) respectively and limit the missing tooth ring (6), the missing tooth gear (12) is fixed with the swing support (8), the rotation axis of the missing tooth gear (12) is collinear with the rotation axis of the swing support (8), the bending motor (13) is fixed with the missing tooth ring (6), the second gear (14) is fixed with the output shaft of the bending motor (13) and is engaged with the missing tooth gear (12); Also includes: The flexible fixing assembly is arranged on the side of the swing support (8) away from the fixed support (2) and is used for fixing the free end of the cable; The flexible fixing assembly comprises: two mounting racks (15) symmetrically distributed, an adjusting screw (16) and a plurality of fastening bands (17), the mounting rack (15) is slidably connected with the swing support (8), the mounting rack (15) is threadedly connected with the adjusting screw (16), the number of fastening bands (17) is even and is divided into two groups, and the two groups of fastening bands (17) are opposite and staggered, all the fastening bands (17) in the same group are distributed at equal intervals, and the two ends of the fastening band (17) are fixed with the adjacent mounting rack (15).

2. The detection device for testing the pressure resistance of the cable according to claim 1, wherein, The sliding support (3) is in contact with the swinging support (8), and a spring is fixed between the fixed support (2) and the sliding support (3), which is used for maintaining the contact state of the sliding support (3) and the swinging support (8).

3. The detection device for testing the pressure resistance of the cable according to claim 1, wherein, The rotation axis of the toothless ring (6) intersects with the rotation axis of the swinging support (8), and the intersection point is located on the upper side of the swinging support (8).

4. The detection device for testing the pressure resistance of an electrical cable according to claim 1, wherein, The inner side of the fastening belt (17) is provided with a rubber layer.

5. The detection device for testing the pressure resistance of an electrical cable according to claim 1, wherein, In the vertical direction, the distance between the two ends of the fastening belt (17) is less than the maximum distance on the upper and lower sides.

6. The detection device for testing the pressure resistance of an electrical cable according to claim 1, wherein, All the fastening belts (17) in the same group are fixed with a support (18), and the support (18) is in sliding connection with the adjacent mounting rack (15).

7. The detection device for testing the pressure resistance of an electrical cable according to claim 1, wherein, Further comprising: A limited rotation fixing assembly is arranged on the side of the fixed support (2) away from the swinging support (8) and is used for fixing the wiring end of the cable; The limited rotation fixing assembly comprises two mounting rings (19) symmetrically distributed, a plurality of fastening rods (20), a flexible sleeve (21) and a fastening motor (22), both of the mounting rings (19) are in rotational connection with the fixed support (2), all of the fastening rods (20) are divided into two groups, the two groups of fastening rods (20) are fixed on the opposite sides of the two mounting rings (19) respectively, the two groups of fastening rods (20) are staggered, the flexible sleeve (21) is sleeved on all of the fastening rods (20), the flexible sleeve (21) is provided with annularly distributed accommodating portions (211) and annularly distributed wrapping portions (212), the number of fastening rods (20) in one group is the same as the number of accommodating portions (211) and wrapping portions (212), three accommodating portions (211) and three wrapping portions (212) are staggered, three fastening rods (20) in the same group are respectively located in three wrapping portions (212), the fastening motor (22) is fixed with the fixed support (2), both of the mounting rings (19) and the output shaft of the fastening motor (22) are in transmission through a bevel gear set, so as to make the two mounting rings (19) rotate in opposite directions.

8. The detection device for testing the pressure resistance of an electrical cable according to claim 7, characterized in that, Further comprising: An adjusting assembly is arranged on the swinging support (8) and is used for adjusting the bending amplitude of the cable; The control assembly comprises a mounting piece (23), a connecting rod (24), a limiting plate (25) and a pressing block (26), the mounting piece (23) is rotationally connected with the swing support (8), a torsional spring is fixedly connected between the mounting piece (23) and the swing support (8), the connecting rod (24) is slidingly connected with the mounting piece (23), one side of the connecting rod (24) away from the mounting piece (23) is fixedly connected with the limiting plate (25), the limiting plate (25) is in contact with the swing support (8), and the contact surfaces of the limiting plate (25) and the swing support (8) are both provided with equidistantly distributed limiting teeth (251), the limiting teeth (251) are used for limiting the limiting plate (25), the pressing block (26) is fixedly connected with the limiting plate (25), and the pressing block (26) is used for fixing the cable.

Images