A copper medium voltage power cable insulation thermal extension test device

Abstract

The present invention relates to the field of power cable testing technology, and discloses a copper medium-voltage power cable insulation thermal extension test device. The present invention solves the problem that the existing copper medium-voltage power cable insulation thermal extension test device has a high risk of fracture at the joints where the two ends of the dumbbell-shaped cable insulation sample with large tensile force are fixed by a clamp, thereby reducing the reliability of the test results. The present invention includes a box body and a hydraulic pump station and a heating component arranged on one side of the box body. Through the synergistic effect of the clamping structure and the merging structure, with the help of a rack, a gear transmission and a magnetic fixation method, the two ends of the sample are firmly fixed, the sample is prevented from loosening during the test, and the accuracy and stability of the test data are ensured. The winding structure is set for the easy-to-break position of the dumbbell-shaped sample, and the easy-to-break position is wound by the rotation of rollers one and two, thereby increasing the contact surface of the sample, reducing the risk of fracture, and improving the reliability of the test.

Description

Technical Field

[0001] The invention relates to the technical field of power cable testing, in particular to a copper medium-voltage power cable insulation thermal extension test device. Background Art

[0002] In recent years, with the rapid growth of the national economy and the continuous improvement and transformation of domestic urban power grids, cross-linked polyethylene cables, as the mainstream products of power cables, have been widely used in transmission lines and distribution networks. 8.7 / 15kv and 26 / 35kV voltage levels have basically adopted cross-linked polyethylene power cables. Improving the operating reliability of high-voltage cables is an important part of strengthening the full life management of power grid assets. The thermal extension test is an indicator for measuring the degree of cross-linking widely used in the wire and cable industry. The test can quickly determine the degree of cross-linking. In production, parameters are often adjusted according to the thermal extension index. It is also an important test for power grid companies to enter the network. The construction of power grids has higher and higher requirements on the thermal extension performance of medium and low voltage cables. Therefore, mastering the insulation thermal extension control technology will have huge advantages in the future competition in medium and low voltage power cables.

[0003] The existing medium-voltage power cable insulation thermal extension test device is to perform a thermal extension test on the dumbbell-shaped sample by cutting the copper medium-voltage power cable insulation layer into dumbbell-shaped samples. The two ends of the dumbbell-shaped sample are clamped and fixed by magnetic fixing clamps. One group of clamps is fixedly installed on the bottom end of the box body, and the other group of clamps is installed and fixed on the hydraulic cylinder. Then, after the inside of the box body is heated to a certain temperature by the heating component, the hydraulic pump station and the hydraulic cylinder are started to drive the tension rope at the output end to perform thermal extension tests with different tensions on the dumbbell-shaped samples fixed by a group of clamps. The dumbbell-shaped sample has two groups of aluminum bars symmetrically arranged at the center. The two groups of aluminum bars are fixed to the sample by bolts. The length between the two groups of aluminum bars is used for the length of the thermal tensile test. When the tension is large, the tension between the clamp and the aluminum bar will inevitably make the sample end position easy to fall off and break, affecting the test efficiency, resulting in the test having to be interrupted due to the breakage of the end during the test, thereby obtaining inaccurate results.

[0004] In view of the above problems, an innovative design was carried out based on the original copper medium voltage power cable insulation thermal extension test device. Summary of the invention

[0005] The purpose of the present invention is to provide a copper medium voltage power cable insulation thermal extension test device. By adopting the device to work, the problem that the existing copper medium voltage power cable insulation thermal extension test device has a high risk of fracture at the sample end during a large tensile test, thereby reducing the reliability of the test results.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a copper medium-voltage power cable insulation thermal extension test device, comprising a box body and a hydraulic pump station and a heating component arranged on one side of the box body, one side of the box body is hinged with a box cover, the top of the hydraulic pump station is provided with a hydraulic cylinder, the output end of the hydraulic cylinder is provided with a tension rope, the outer end of the tension rope is provided with a hydraulic tensioner, one end of the tension rope is provided with a clamping structure, a sample is fixedly connected between the clamping structures, an anti-slip structure for preventing breakage and separation under large tension is provided between the tension rope and the clamping structure, and the clamping structure A merging structure is arranged on both sides, and a winding structure for dispersing stress is arranged at both ends of the sample; the heating component includes a heater arranged on one side of the box body, a heating tube is fixedly connected to one side of the heater, the heating tube is embedded in the inner wall of the box body, and a temperature sensor is connected to one side of the heater, and one end of the temperature sensor extends into the interior of the box body; the clamping structure includes a clamping plate 1 and a clamping plate 2 fixed on both sides of the sample by magnetic attraction, and the clamping plate 1 and the clamping plate 2 are symmetrically distributed about the transverse center axis of the sample in two groups, one group of the clamping plate 1 is provided with a horizontal plate at the top, and the other group of the clamping plate 1 is provided with a hanging column on one side, and one group of the clamping plate A column sleeve is provided on one side of the second board, and holes are provided at both ends of the sample. The sample passes through the hanging column through the holes, and the hanging column and the column sleeve are fixed by magnetic attraction; the anti-slip structure includes a box body arranged at the top of the horizontal plate, and an opening is provided on the top surface of the box body. The anti-slip structure also includes an insertion strip arranged at the end of the tension rope away from the hydraulic cylinder. The inside of the box body is elastically connected with an inner shell, and a notch is provided on the surface of the inner shell. A steel ball is slidably connected inside the notch. An outer shell is provided inside the box body, and the outer shell is movably connected to the inner shell. A pulling plate is provided on one side of the inner shell, and the pulling plate is slidably connected to the box body; the merging structure includes a A connecting plate, a rack 1 arranged on one side, the merging structure also includes a side plate arranged on one side of the cross plate, one side of the side plate is rotatably connected with gear 1 and gear 2, gear 1 is meshed with rack 1, an extension plate is arranged on one side of the side plate, one side of the extension plate is slidably connected with rack 2, rack 2 is meshed with gear 2, and rack 2 is fixedly connected to clamp plate 2; the winding structure includes a driven rod rotatably connected to one side of the side plate, gear 3 arranged on the surface of the driven rod, rack 3 arranged at one end of rack 1, rack 3 is meshed with gear 3, a turntable arranged on one side of the driven rod, and roller 1 and roller 2 arranged on one side of the turntable.

[0007] Furthermore, a first magnetic block is arranged at one end of the hanging column, and a second magnetic block is arranged at one end of the column sleeve close to the hanging column, and the first magnetic block and the second magnetic block attract each other with opposite poles.

[0008] Furthermore, the hanging columns and column sleeves are arranged in three groups at equal intervals, and the three groups of hanging columns and column sleeves are distributed in a one-to-one correspondence.

[0009] Furthermore, an opening is provided on the surface of the box body, and the pulling plate slides in the opening. The inner shell is in a truncated cone shape, which is larger at the top and smaller at the bottom. A spring 1 is provided at the bottom end of the inner shell, and the end of the spring 1 away from the inner shell is connected to the box body.

[0010] Furthermore, the slots are provided with four groups at equal intervals, and the steel balls are also distributed in four groups accordingly. The four groups of steel balls slide in the slots one by one, and the intervals between the four groups of steel balls are smaller than the diameter of the insert. The surfaces of the steel balls are provided with convex points, which are in contact with the insert and the inside of the shell.

[0011] Furthermore, a rotating rod is rotatably connected to one side of the side plate, and the rotating rod is fixedly connected to gear one and gear two, a fixed block is provided on one side of the rack two, and the fixed block is fixedly connected to the clamping plate two, a sliding groove is provided on the surface of the extension plate, and a slider is slidably connected inside the sliding groove, and the slider is fixedly connected to the rack two, a spring two is provided on one side of the slider, and the end of the spring two away from the slider is connected to the sliding groove.

[0012] Furthermore, a moving structure is provided inside the box, and the moving structure includes a motor arranged at the bottom end of the box, a screw rod is provided at the output end of the motor, a moving block is slidably connected to the bottom end of the box, the moving block is threadedly connected to the screw rod, and an anti-slip structure is also provided at the top of the moving block, and the anti-slip structure is connected and fixed to splint 1 and splint 2 which are magnetically fixed to the outside of the other end of the sample.

[0013] Furthermore, the outer side of the sample is bolted with aluminum bars, and there are two groups of aluminum bars symmetrically distributed about the transverse center axis of the sample. The sample length between the two groups of aluminum bars is used for heating tensile testing, and the length between the two groups of aluminum bars and the clamping plates at both ends of the sample is used for winding.

[0014] Furthermore, an adjustment structure is provided inside the box, and the adjustment structure includes a support plate symmetrically arranged inside the box, a rotating shaft is provided on one side of the support plate, a vertical plate is provided at one end of the rotating shaft, and a laser receiver is provided on the surface of the vertical plate. There are two groups of laser receivers symmetrically distributed about the horizontal center axis of the vertical plate, and the two groups of laser receivers are distributed corresponding to the aluminum bars respectively.

[0015] Furthermore, a top plate is provided inside the box body, a groove is provided on the surface of the top plate, a protrusion is slidably connected inside the groove, the protrusion is fixedly connected to the vertical plate, a spring three is provided on one side of the protrusion, a side of the spring three away from the protrusion is connected to the groove, and push plates for pushing the vertical plate to rotate and tilt are provided on both sides of the other group of clamping plates two.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention proposes a copper medium-voltage power cable insulation thermal extension test device. The existing copper medium-voltage power cable insulation thermal extension test device has a high risk of sample end breakage during large tensile force testing, which reduces the reliability of the test results. The present invention, through the provision of an anti-slip structure, utilizes the cooperation of steel balls, inner shell, outer shell and other components to ensure that the tension rope is firmly connected to the box body, and will not fall off or break when the tension is large, thereby ensuring the smooth progress of the test and improving the accuracy of the test results. Secondly, the synergistic effect of the clamping structure and the merging structure, with the help of rack, gear transmission and magnetic fixing, achieves a firm fixation of both ends of the sample, prevents the sample from loosening during the test, and ensures the accuracy and stability of the test data. Furthermore, the winding structure set for the easy-to-break position of the dumbbell sheet sample, winds the easy-to-break position through the rotation of roller one and roller two, increases the contact surface of the sample, reduces the risk of breakage, improves the reliability of the test, and ensures the smooth progress of the thermal extension test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall three-dimensional cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the heating assembly and the box body of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the anti-slip structure, the clamping structure, the sample and the aluminum strip of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the anti-slip structure and the clamping structure of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the clamping structure and the merging structure of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the winding structure of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the moving structure and the adjusting structure of the present invention.

[0019] In the figure: 1, box body; 2, heating assembly; 21, heater; 22, heating tube; 23, temperature sensor; 3, hydraulic pump station; 4, hydraulic cylinder; 5, pulling rope; 6, hydraulic tensioner; 7, anti-slip structure; 71, insert; 72, box body; 73, opening; 74, inner shell; 75, notch; 76, steel ball; 77, spring 1; 78, outer shell; 79, pulling plate; 710, opening; 8, clamping structure; 81, horizontal plate; 82, clamping plate 1; 83, hanging column; 84, clamping plate 2; 85, column sleeve; 86, magnetic block 1; 87, magnetic block 2; 9, merging structure; 91, connecting plate; 92, rack 1; 93, gear 1; 94, rotating rod; 95, gear 2 ;96, rack two;97, fixed block;98, extension plate;99, slide groove;910, slider;911, spring two;912, side plate;10, box cover;11, sample;12, winding structure;121, rack three;122, gear three;123, driven rod;124, turntable;125, roller one;126, roller two;13, moving structure;131, motor;132, screw rod;133, moving block;14, adjusting structure;141, support plate;142, rotating shaft;143, vertical plate;144, bump;145, top plate;146, groove;147, spring three;148, push plate;15, aluminum bar;16, laser receiver. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0022] Combination Figure 1-Figure 7 A copper medium-voltage power cable insulation thermal extension test device comprises a box body 1 and a hydraulic pump station 3 and a heating assembly 2 arranged on one side of the box body 1, a box cover 10 is hinged on one side of the box body 1, a hydraulic cylinder 4 is arranged on the top of the hydraulic pump station 3, a pulling rope 5 is arranged on the output end of the hydraulic cylinder 4, a hydraulic tensioner 6 is arranged on the outer end of the pulling rope 5, a clamping structure 8 is arranged at one end of the pulling rope 5, a sample 11 is fixedly connected between the clamping structures 8, an anti-slip structure 7 for preventing breakage and separation under large pulling force is arranged between the pulling rope 5 and the clamping structure 8, a merging structure 9 is arranged on both sides of the clamping structure 8, and a winding structure 12 for dispersing stress is arranged at both ends of the sample 11.

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] See also Figure 1-8 The heating assembly 2 includes a heater 21 arranged on one side of the box body 1, a heating tube 22 is fixedly connected to one side of the heater 21, the heating tube 22 is embedded in the inner wall of the box body 1, and a temperature sensor 23 is connected to one side of the heater 21, and one end of the temperature sensor 23 extends into the interior of the box body 1.

[0025] The clamping structure 8 includes a clamping plate 1 82 and a clamping plate 2 84 which are magnetically fixed on both sides of the sample 11. The clamping plate 1 82 and the clamping plate 2 84 are symmetrically distributed in two groups about the transverse center axis of the sample 11. A cross plate 81 is arranged on the top of the clamping plate 1 82 in one group, a hanging column 83 is arranged on one side of the clamping plate 1 82 in the other group, and a column sleeve 85 is arranged on one side of the clamping plate 2 84 in one group. Through holes are provided at both ends of the sample 11, and the sample 11 passes through the hanging column 83 through the through holes. The hanging column 83 and the column sleeve 85 are magnetically fixed. A magnetic block 1 86 is arranged at one end of the hanging column 83, and a magnetic block 2 87 is arranged at one end of the column sleeve 85 close to the hanging column 83. The magnetic block 1 86 and the magnetic block 2 87 are attracted to each other with opposite poles. The hanging column 83 and the column sleeve 85 are arranged in three groups with equal intervals, and the three groups of the hanging column 83 and the column sleeve 85 are distributed in a one-to-one correspondence, so that the two ends of the sample 11 can be firmly fixed, thereby improving the reliability of the fixation.

[0026] The anti-slip structure 7 includes a box body 72 arranged at the top of the horizontal plate 81, an opening 73 provided on the top surface of the box body 72, the anti-slip structure 7 also includes a plug 71 provided at the end of the tension rope 5 away from the hydraulic cylinder 4, the box body 72 is elastically connected to the inner shell 74, the surface of the inner shell 74 is provided with a notch 75, and the notch 75 is slidably connected with a steel ball 76, the box body 72 is provided with an outer shell 78, the outer shell 78 is movably connected to the inner shell 74, a pulling plate 79 is provided on one side of the inner shell 74, the pulling plate 79 is slidably connected to the box body 72, the surface of the box body 72 is provided with an opening 710, and the pulling plate 79 is in the opening 710. The inner shell 74 is truncated cone-shaped, the inner shell 74 is larger at the top and smaller at the bottom, a spring 77 is provided at the bottom end of the inner shell 74, and the spring 77 is connected to the box body 72 at one end away from the inner shell 74. Four groups of notches 75 are provided at equal intervals, and four groups of steel balls 76 are also distributed accordingly. The four groups of steel balls 76 slide in the notches 75 one by one, and the spacing between the four groups of steel balls 76 is smaller than the diameter of the insertion strip 71. The surface of the steel balls 76 is provided with convex points, which are in contact with the insertion strip 71 and the inside of the outer shell 78, and will not fall off or break when the pulling force is large, thereby ensuring the smooth progress of the test and avoiding the accuracy of the test results being affected by falling off.

[0027] The merging structure 9 includes a connecting plate 91 arranged outside the insert 71, a rack 92 arranged on one side, and a side plate 912 arranged on one side of the transverse plate 81, one side of the side plate 912 is rotatably connected with a gear 93 and a gear 95, the gear 93 is meshed with the rack 92, an extension plate 98 is arranged on one side of the side plate 912, one side of the extension plate 98 is slidably connected with a rack 96, the rack 96 is meshed with the gear 95, the rack 96 is fixedly connected with the clamping plate 84, and one side of the side plate 912 is rotatably connected with a rotating rod 94, The rotating rod 94 is connected and fixed to the gear 1 93 and the gear 2 95. A fixed block 97 is provided on one side of the rack 2 96. The fixed block 97 is connected and fixed to the clamp 2 84. A slide groove 99 is provided on the surface of the extension plate 98. A slider 910 is slidably connected inside the slide groove 99. The slider 910 is connected and fixed to the rack 2 96. A spring 2 911 is provided on one side of the slider 910. One end of the spring 2 911 away from the slider 910 is connected to the slide groove 99 to prevent the sample 11 from loosening during the test, thereby ensuring the accuracy and stability of the test data.

[0028] The winding structure 12 includes a driven rod 123 rotatably connected to one side of the side plate 912, a gear three 122 arranged on the surface of the driven rod 123, a rack three 121 arranged at one end of the rack one 92, the rack three 121 meshing with the gear three 122, a turntable 124 arranged on one side of the driven rod 123, and rollers one 125 and two 126 arranged on one side of the turntable 124. The contact surface of the rollers one 125 and two 126 for winding is large, and the position where the dumbbell sheet sample 11 is prone to break is wound, thereby increasing the contact surface of the sample 11, reducing the risk of breakage, and improving the reliability of the test.

[0029] A moving structure 13 is provided inside the box body 1, and the moving structure 13 includes a motor 131 arranged at the bottom end of the box body 1, and a screw rod 132 is provided at the output end of the motor 131. A moving block 133 is slidably connected to the bottom end of the box body 1, and the moving block 133 is threadedly connected to the screw rod 132. An anti-slip structure 7 is also provided at the top of the moving block 133. The anti-slip structure 7 is connected and fixed to a clamp plate 1 82 and a clamp plate 2 84 that are magnetically fixed to the outside of the other end of the sample 11, thereby realizing a non-linear thermal extension test on the sample 11 and simulating the thermal extension of the sample 11 under different conditions.

[0030] The outer side of the sample 11 is bolted with an aluminum bar 15, and the aluminum bar 15 is symmetrically distributed in two groups about the transverse center axis of the sample 11. The length of the sample 11 between the two groups of aluminum bars 15 is used for heating and tensile testing, and the length between the two groups of aluminum bars 15 and the clamping plates at both ends of the sample 11 is used for winding. The inside of the box 1 is provided with an adjustment structure 14, and the adjustment structure 14 includes a support plate 141 symmetrically arranged inside the box 1, a rotating shaft 142 is arranged on one side of the support plate 141, and a vertical plate 143 is arranged at one end of the rotating shaft 142. A laser receiver 16 is arranged on the surface of the vertical plate 143, and the laser receiver 16 is symmetrically distributed about the transverse center axis of the vertical plate 143. Two groups, the two groups of laser receivers 16 are respectively distributed corresponding to the aluminum strips 15, a top plate 145 is arranged inside the box body 1, a groove 146 is opened on the surface of the top plate 145, a protrusion 144 is slidably connected inside the groove 146, the protrusion 144 is connected and fixed to the vertical plate 143, a spring three 147 is arranged on one side of the protrusion 144, and the side of the spring three 147 away from the protrusion 144 is connected to the groove 146, and push plates 148 for pushing the vertical plate 143 to rotate and tilt are arranged on both sides of the other group of clamp plates 2 84, the laser receiver 16 on the vertical plate 143 can tilt with the tilt of the sample 11, so as to ensure the accurate measurement and reading of the stretching length.

[0031] Specifically, when in use, the tension rope 5 is fixedly connected to the horizontal plate 81 through the anti-slip structure 7. Since the horizontal plate 81 is fixedly connected to the second clamping plate 84, and since the horizontal plate 81 is fixedly connected to the box body 72, the insertion strip 71 set at one end of the tension rope 5 is aligned with the opening 73 opened on the top surface of the box body 72 and inserted, and the spacing between the four groups of steel balls 76 is smaller than the diameter of the insertion strip 71, so that the insertion strip 71 is inserted into the spacing between the four groups of steel balls 76, and the insertion strip 71 contacts the convex points set on the surface of the steel balls 76. The insertion of the inner shell 74 drives the four groups of steel balls 76 to roll downward along the notches 75 provided on the surface of the inner shell 74. Since the outer shell 78 is provided inside the box body 1, the steel balls 76 first contact the inner surface of the outer shell 78, so that the four groups of steel balls 76 roll downward in the notches 75 as the insertion of the insert strip 71 is pushed. Since the inner shell 74 is a truncated cone shape, the inner shell 74 is larger at the top and smaller at the bottom, the spacing between the four groups of steel balls 76 becomes larger, and the inner shell 74 squeezes and accumulates force on the spring 77 at the bottom, and further inserts a part of the insert strip 71 into the four groups of steel balls. The beads 76 are close to one side of the spring 1 77, so that the insertion strip 71 and the four groups of steel beads 76 are limited and fixed. When the tension rope 5 is pulled upward, the four groups of steel beads 76 slide along the notch 75 toward the small diameter of the inner shell 74, making the spacing between the four groups of steel beads 76 smaller and smaller, which will clamp the insertion strip 71 more tightly, thereby achieving an anti-slip effect. When it is necessary to separate the insertion strip 71 from the box body 72, the pulling plate 79 is pushed away from the spring 1 77, and the pulling plate 79 slides in the opening 710, and the pulling plate 79 is pulled The movable inner shell 74 moves upward, so that the four groups of steel balls 76 roll in the slot 75 toward the wide mouth, and the spacing between the four groups of steel balls 76 is enlarged. The spacing between the four groups of steel balls 76 is larger than the diameter of the insert 71, so that the insert 71 can be easily pulled out, and it is avoided that when the tension rope 5 is pulled upward with a large force, it will cause the test result to fall off and break, and ensure that the tension rope 5 is firmly connected to the box body 72, and will not fall off and break when the tension is large, thereby ensuring the smooth progress of the test and avoiding the accuracy of the test result being affected by falling off.

[0032] Then, the two ends of the sample 11 are fixed respectively by the two groups of clamping plates 1 82 and clamping plate 2 84 of the clamping structure 8 and the driving of the merging structure 9. Since the two ends of the sample 11 are correspondingly provided with perforations, the perforations provided at one end of the sample 11 are passed through the hanging columns 83 correspondingly provided on one side of a group of clamping plates 1 82. As the insertion strip 71 is inserted downward, the insertion strip 71 drives the racks 1 92 on both sides of the connecting plate 91 to move downward and mesh with the gear 1 93. The gear 1 93 drives the rotating rod 94 to rotate. The rotating rod 94 is rotationally connected to the side plate 912. The side plate 912 is connected and fixed to the cross plate 81. The rotating rod 94 drives the gear 2 95 to rotate and mesh with the rack 2 96. The rack 2 96 slides in the slide groove 99 provided on the surface of the extension plate 98 through the slider 910 at the bottom. The extension plate 98 is fixed to the side plate 912. The slider 910 drives the spring 2 911 to stretch and store force. The rack 2 96 drives the clamping plate 2 84 to move toward the clamping plate 1 82 through the fixing block 97. , so that the column sleeve 85 set on one side of the second clamp plate 84 is magnetically fixed with the hanging column 83 set on one side of the first clamp plate 82 in a one-to-one correspondence, so that the magnetic block 87 at one end of the column sleeve 85 and the magnetic block 86 at one end of the hanging column 83 are attracted and fixed with opposite poles, thereby fixing one end of the sample 11, and the clamp plate 82 and the second clamp plate 84 at the other end of the sample 11 are fixed to the moving block 133 through the anti-slip structure 7, so that the rack 92 on one side of the clamp plate 82 at the other end of the sample 11 is squeezed and moved by the moving block 133 to engage with the gear 93, so that the second clamp plate 84 moves and clamps the other end of the sample 11, and the side plate 912 of the rack 92 is slidably connected, thereby completing the clamping and fixing of the two ends of the sample 11, and can firmly fix the two ends of the sample 11, thereby improving the reliability of the fixation, and making the fixation more firm through magnetic fixation, preventing the sample 11 from loosening during the test, and ensuring the accuracy and stability of the test data.

[0033] Then, a group of aluminum bars 15 are fixed by bolts at 20 cm positions on both sides of the center line of the sample 11, so that there is a certain distance between the two groups of aluminum bars 15. As the rack 1 92 moves, the rack 3 121 at one end is driven to move, the rack 3 121 is meshed with the gear 3 122, the gear 3 122 drives the driven rod 123 to rotate, the driven rod 123 is rotatably connected to the side plate 912, the driven rod 123 drives the turntable 124 to rotate, the turntable 124 drives the roller 1 125 and the roller 2 126 to rotate, at this time, the roller 125 and the roller 2 126 are respectively on the sample The two sides of the sample 11 are wound by the rollers 125 and 126, and the rollers 125 and 126 rotate to wind the two groups of aluminum bars 15 with the lengths between the clamps 1 82 and the clamps 2 84, respectively, to avoid the breakage of the end positions between the aluminum bars 15 and the clamps during the thermal extension test, which affects the test efficiency. The sample 11 is wound at the position prone to breakage by the rollers 125 and 126, so that the winding contact area is large, the risk of breakage is reduced, the reliability of the test is improved, the test efficiency is avoided to be affected by the breakage of the end positions, and the thermal extension test can be ensured to be carried out smoothly.

[0034] After the sample 11 is fixed, the hinged box cover 10 is closed, and then the heater 21 on one side of the box body 1 is started. The heater 21 heats the heating pipe 22 embedded in the inner wall of the box body 1, so that the temperature inside the box body 1 is heated to the set temperature. The internal temperature is monitored by the temperature sensor 23 set on one side of the box body 1 and fed back to the electrically connected control panel for temperature regulation, so that the hydraulic pump station 3 and the hydraulic cylinder 4 are started through the control panel to drive, so that the hydraulic cylinder 4 is operated to perform a tensile test on one end of the fixed sample 11 through the tension rope 5, and the sample 11 is fixed to the box body 1. Two groups of vertical plates 143 are correspondingly arranged on the adjustment structure 14. Laser receivers 16 are arranged on one side of the two groups of vertical plates 143 close to the sample 11 and corresponding to the aluminum bar 15. The laser receivers 16 can accurately read and record the stretching length of the sample 11 during the thermal stretching test, and provide data support for the analysis of the test results, thereby facilitating the reading and recording of the stretching length of the sample 11 during the thermal stretching test. In addition, two groups of hydraulic tensioners 6 are arranged at a certain distance on the tension rope 5. The hydraulic tensioners 6 facilitate the adjustment of different tensions to perform stretching tests on the sample to meet different testing requirements.

[0035] The motor 131 at the bottom of the box body 1 is driven by the external control board, and the motor 131 drives the screw rod 132 at the output end to rotate. The screw rod 132 is threadedly connected to the moving block 133, and the moving block 133 is slidably connected to the inside of the box body 1. The moving block 133 drives one end of the fixed sample 11 to move, so as to perform a non-linear thermal extension test on the sample 11, which is convenient for the results of the thermal extension test of the cable insulation sleeve under different conditions. As the moving block 133 moves, the push plate 148 set on one side of the clamping plate 82 pushes the bottom end of the vertical plate 143, and the vertical plate 143 rotates through the rotating shaft 142. The rotating shaft 142 is connected and fixed to the inner wall of the box body 1 through the rotatably connected support plate 141, so that the top of the vertical plate 143 The protrusion 144 slides inside the groove 146 opened on the surface of the top plate 145, and the top plate 145 is fixed to the inner wall of the box body 1. The protrusion 144 drives the spring three 147 to stretch and store force, so that the vertical plate 143 drives the laser receiver 16 on the surface to measure and read the stretched length as the sample 11 tilts. This realizes the non-linear thermal extension test of the sample 11 and simulates the thermal extension of the sample 11 under different conditions, making the test result more comprehensive and accurate, and providing a richer basis for the performance evaluation of the sample 11 in actual use. As the moving block 133 moves, the laser receiver 16 on the vertical plate 143 can tilt as the sample 11 tilts, ensuring accurate measurement and reading of the stretched length.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A copper medium voltage power cable insulation thermal extension test device, comprising a box (1) and a hydraulic pump station (3) and a heating assembly (2) arranged on one side of the box (1), characterized in that: A box cover (10) is hingedly connected to one side of the box body (1), a hydraulic cylinder (4) is arranged at the top of the hydraulic pump station (3), a pulling rope (5) is arranged at the output end of the hydraulic cylinder (4), a hydraulic tensioner (6) is arranged at the outer end of the pulling rope (5), a clamping structure (8) is arranged at one end of the pulling rope (5), a sample (11) is fixedly connected between the clamping structures (8), an anti-slip structure (7) for preventing breakage and separation under a large pulling force is arranged between the pulling rope (5) and the clamping structure (8), a merging structure (9) is arranged on both sides of the clamping structure (8), and a winding structure (12) for dispersing stress is arranged at both ends of the sample (11); the heating component (2) includes a heating element (14) arranged at one side of the box body (1) and a heating element (15) arranged at one side of the box body (1). A heater (21) is provided, one side of the heater (21) is fixedly connected to a heating tube (22), the heating tube (22) is embedded in the inner wall of the box (1), and is connected to a temperature sensor (23) on one side of the heater (21), one end of the temperature sensor (23) extends into the interior of the box (1); the clamping structure (8) comprises a clamping plate 1 (82) and a clamping plate 2 (84) which are magnetically fixed to both sides of the sample (11), the clamping plate 1 (82) and the clamping plate 2 (84) are symmetrically distributed about the transverse center axis of the sample (11), one group of the clamping plates 1 (82) is provided with a cross plate (81) at the top end, the other group of the clamping plates 1 (82) is provided with a hanging column (83) on one side, and one group of the clamping plates 2 (84) is provided with a column sleeve (85) on one side. ), through holes are provided at both ends of the sample (11), the sample (11) passes through the hanging column (83) through the through holes, and the hanging column (83) is fixed to the column sleeve (85) by magnetic attraction; the anti-slip structure (7) includes a box body (72) arranged at the top of the horizontal plate (81), and an opening (73) is provided on the top surface of the box body (72); the anti-slip structure (7) also includes an insertion strip (71) arranged at the end of the tension rope (5) away from the hydraulic cylinder (4); the box body (72) is elastically connected to an inner shell (74), a notch (75) is provided on the surface of the inner shell (74), and a steel ball (76) is slidably connected to the inside of the notch (75); an outer shell (78) is provided inside the box body (72), and the outer shell (78) is movably connected to the inner shell (74), and the inner shell (74) is movably connected to the inner shell (74). A pulling plate (79) is provided on one side of the shell (74), and the pulling plate (79) is slidably connected to the box body (72); the merging structure (9) comprises a connecting plate (91) arranged outside the inserting strip (71), and a rack gear 1 (92) arranged on one side; the merging structure (9) further comprises a side plate (912) arranged on one side of the transverse plate (81), and a gear gear 1 (93) and a gear gear 2 (95) are rotatably connected on one side of the side plate (912), and the gear gear 1 (93) meshes with the rack gear 1 (92); an extension plate (98) is provided on one side of the side plate (912), and a rack gear 2 (96) is slidably connected on one side of the extension plate (98), and the rack gear 2 (96) meshes with the gear gear 2 (95), and the rack gear 2 (96) is connected and fixed to the clamping plate 2 (84);The winding structure (12) comprises a driven rod (123) rotatably connected to one side of the side plate (912), a gear three (122) arranged on the surface of the driven rod (123), a rack three (121) arranged at one end of the rack one (92), the rack three (121) meshing with the gear three (122), a rotating disk (124) arranged on one side of the driven rod (123), and a rotating roller one (125) and a rotating roller two (126) arranged on one side of the rotating disk (124). ; 2. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: One end of the hanging column (83) is provided with a first magnetic block (86), and one end of the column sleeve (85) close to the hanging column (83) is provided with a second magnetic block (87), and the first magnetic block (86) and the second magnetic block (87) have opposite poles that attract each other.

3. A copper medium voltage power cable insulation thermal extension test device according to claim 2, characterized in that: The hanging columns (83) and column sleeves (85) are arranged in three groups at equal intervals, and the three groups of hanging columns (83) and column sleeves (85) are distributed in a one-to-one correspondence.

4. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: The surface of the box body (72) is provided with an opening (710), and the pulling plate (79) slides in the opening (710). The inner shell (74) is in the shape of a truncated cone, with the inner shell (74) being larger at the top and smaller at the bottom. A spring (77) is provided at the bottom end of the inner shell (74), and the end of the spring (77) away from the inner shell (74) is connected to the box body (72).

5. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: The notches (75) are provided with four groups at equal intervals, and the steel balls (76) are also distributed in four groups accordingly. The four groups of steel balls (76) slide in the notches (75) one by one, and the intervals between the four groups of steel balls (76) are smaller than the diameter of the insert (71). The surfaces of the steel balls (76) are provided with convex points, and the convex points are in contact with the insert (71) and the inside of the housing (78).

6. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: One side of the side plate (912) is rotatably connected to a rotating rod (94), and the rotating rod (94) is connected and fixed to the first gear (93) and the second gear (95). One side of the second rack (96) is provided with a fixing block (97), and the fixing block (97) is connected and fixed to the second clamping plate (84). A sliding groove (99) is provided on the surface of the extension plate (98), and a slider (910) is slidably connected inside the sliding groove (99), and the slider (910) is connected and fixed to the second rack (96). One side of the slider (910) is provided with a second spring (911), and the end of the second spring (911) away from the slider (910) is connected to the sliding groove (99).

7. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: A moving structure (13) is arranged inside the box (1), and the moving structure (13) includes a motor (131) arranged at the bottom end of the box (1), and a screw (132) is arranged at the output end of the motor (131). A moving block (133) is slidably connected to the bottom end of the box (1), and the moving block (133) is threadedly connected to the screw (132). The top of the moving block (133) is also provided with an anti-slip structure (7), and the anti-slip structure (7) is connected and fixed to a clamping plate 1 (82) and a clamping plate 2 (84) that are magnetically fixed to the outside of the other end of the sample (11).

8. A copper medium voltage power cable insulation thermal extension test device according to claim 7, characterized in that: An aluminum bar (15) is fixed to the outer side of the sample (11) with bolts, and two groups of aluminum bars (15) are symmetrically distributed about the transverse center axis of the sample (11). The length of the sample (11) between the two groups of aluminum bars (15) is used for heating tensile testing, and the length between the two groups of aluminum bars (15) and the clamping plates at both ends of the sample (11) is used for winding.

9. A copper medium voltage power cable insulation thermal extension test device according to claim 1, characterized in that: An adjustment structure (14) is arranged inside the box (1), and the adjustment structure (14) comprises a support plate (141) symmetrically arranged inside the box (1), a rotating shaft (142) is arranged on one side of the support plate (141), a vertical plate (143) is arranged at one end of the rotating shaft (142), and a laser receiver (16) is arranged on the surface of the vertical plate (143), and two groups of laser receivers (16) are symmetrically distributed about the transverse center axis of the vertical plate (143), and the two groups of laser receivers (16) are respectively distributed corresponding to the aluminum bars (15).

10. A copper medium voltage power cable insulation thermal extension test device according to claim 9, characterized in that: A top plate (145) is provided inside the box body (1), a groove (146) is provided on the surface of the top plate (145), a protrusion (144) is slidably connected inside the groove (146), the protrusion (144) is fixedly connected to the vertical plate (143), a spring three (147) is provided on one side of the protrusion (144), and a side of the spring three (147) away from the protrusion (144) is connected to the groove (146), and push plates (148) are provided on both sides of the other group of clamping plates (84).

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