A non-load-bearing splicing clamp accelerated test bench

Abstract

The present invention discloses an accelerated test bench for non-load-bearing splicing line clamps, including a mechanical system, a large current generator, a measuring system and a PC host computer. The mechanical system is composed of a system frame, a universal tensile loading mechanism, a frequency modulation deformation excitation mechanism, a concentric swing adjustment mechanism and an electric axial loading mechanism; the positive pole of the large current generator is connected to the overhead high-voltage cable, and the negative pole thereof is connected to the drainage line; the measuring system is connected to the PC host computer via serial communication. The accelerated test bench for non-load-bearing splicing line clamps of the present invention can perform tensile loading and frequency modulation deformation excitation tests on the overhead high-voltage cable through the universal tensile loading mechanism and the frequency modulation deformation excitation mechanism, and can perform concentric swing and axial loading tests on the drainage line respectively through the concentric swing adjustment mechanism and the electric axial loading mechanism, thereby realizing the monitoring and evaluation of the life expectancy and performance degradation of the non-load-bearing splicing line clamps in a simulated real distribution network environment, with high accuracy, safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of electric power construction equipment, and in particular to an accelerated test bench for non-load-bearing splicing clamps. Background Art

[0002] Non-load-bearing splicing clamps are key electrical connection points and branch points in distribution networks. Currently, there are billions of non-load-bearing splicing clamps (including lead-in clamps and equipment clamps) in service. As the scale of the power grid continues to expand, the number of clamps in service each year is still rising year by year. The huge stock and increase of splicing clamps have brought challenges to the operation of the power grid: According to statistics, the failure rate of distribution overhead lines accounts for about 70% of the total network failure rate, among which the failure rate of non-load-bearing splicing clamps accounts for the highest proportion, especially during the peak summer and winter periods, when the failure of distribution network splicing points is the most common in the repair of distribution overhead lines. The failure of non-load-bearing splicing nodes and clamps is based on empirical judgment after the failure. There is no theoretical guidance and means to deeply reveal and predict the evolution mechanism of the service performance of the clamps, and there is a lack of long-term service performance test assessment and evaluation methods for the clamps, which is not conducive to the lean operation and maintenance of distribution network equipment.

[0003] The current technical standards for connecting wire clamps only assess the performance of direct resistance, temperature rise, grip and thermal cycle, and cannot truly assess the performance of wire clamps under the coupling of multi-physical fields of "force-heat-electricity-current" (clamp grip, temperature field, electric field, wind field) in a long-term operating environment. It is difficult to accurately evaluate the long-term service reliability of wire clamps by type tests and network access tests, resulting in a high failure rate of long-term operating wire clamps. After fault analysis, except for a small number of unqualified products, most of the faulty connecting wire clamps have passed the type test and meet the quality standards for network access. The type test specified in the current standard cannot cover the performance and life evaluation of connecting wire clamps. The actual service performance of non-load-bearing distribution network connection points is affected by many factors, such as periodic changes in ambient temperature, atmospheric corrosion, current load changes, breeze vibration, wind dance, material creep, etc., thus forming complex failure manifestations, such as electrical contact failure, micro-motion wear, corrosion failure, fatigue fracture, loosening and falling off.

[0004] At present, there are no clear evaluation methods, equipment and standards for the service life and performance of non-load-bearing splicing clamps in distribution networks, especially their durability under actual working conditions. There is no accelerated test bench specifically for non-load-bearing splicing clamps in distribution networks. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes an accelerated test bench for non-load-bearing splicing clamps.

[0006] The present invention proposes a non-load-bearing splice clamp acceleration test bench, which is applied to the acceleration test of the splice clamp connecting the overhead high-voltage cable and the drain line, and comprises a mechanical system, a large current generator, a measurement system and a PC host computer, wherein the mechanical system is composed of a system frame, a universal tensile loading mechanism, a frequency modulation deformation excitation mechanism, a concentric swing adjustment mechanism and an electric axial loading mechanism, wherein the overhead high-voltage cable, the drain line, the universal tensile loading mechanism, the frequency modulation deformation excitation mechanism, the concentric swing adjustment mechanism and the electric axial loading mechanism are all installed in the system frame; the positive pole of the large current generator is connected to the overhead On the high-voltage cable, its negative pole is connected to the drainage line, and the high-current generator is connected to the PC host computer through serial communication; the measuring system includes a micro-ohmmeter, a force sensor, a displacement sensor and a temperature sensor, and they are all installed in the mechanical system, and the measuring system is connected to the PC host computer through serial communication; the overhead high-voltage cable can be subjected to tension loading through the universal tension loading mechanism, the overhead high-voltage cable can be subjected to frequency modulation deformation excitation test through the frequency modulation deformation excitation mechanism, and the drainage line can be subjected to concentric swing and axial loading tests respectively through the concentric swing adjustment mechanism and the electric axial loading mechanism.

[0007] Preferably, the system rack includes a base rack and a suspension rack, the suspension rack is a door-shaped structure composed of two supporting uprights and a horizontal flat plate, the bottom ends of the supporting uprights are fixed to the base rack; auxiliary support rods are provided on the outer sides of the two supporting uprights, the upper ends of the auxiliary support rods are fixed to the supporting uprights, and the lower ends of the base rack and the auxiliary support rods are placed on the ground platform.

[0008] Preferably, the universal tension loading mechanism includes an upright screw rod and a main line pull plate, two upright screw rods are provided and respectively installed on the inner sides of two supporting uprights, the upper end of the upright screw rod is fixed on the horizontal flat plate through a bearing, and the lower end thereof is installed on the base frame through a bearing, four through holes are provided on the main line pull plate, two supporting uprights and two upright screw rods are respectively penetrated in the four through holes of the main line pull plate, and a pull plate support is installed in the through hole where the upright screw rod is connected to the main line pull plate, the pull plate support is threadedly connected to the upright screw rod, and the upright screw rod is rotated by controlling a motor; the upper end of the overhead high-voltage cable is fixed to the main line pull plate through a force measuring fixture, a fixing fixture is installed on the upper end surface of the base frame, and the lower end of the overhead high-voltage cable is fixed by the fixing fixture and connected to a large current generator.

[0009] Preferably, the lower end of the upright screw rod passes through the base frame, and the connection between the upright screw rod and the base frame is fixedly installed through a bearing. A passive wheel is installed at the bottom end of the upright screw rod, and the motor 1 is installed in the base frame, and a driving wheel is installed on its output shaft, and the driving wheel is connected to the passive wheels on the two upright screw rods through a belt.

[0010] Preferably, the frequency-modulated deformation excitation mechanism comprises a sliding platform, an elliptical orbit turntable, a linear slide, a reciprocating slide, a measuring rod, a trajectory copying rod and a main line clamping block, the sliding platform is fixedly mounted on two supporting uprights on one side of the overhead high-voltage cable, the elliptical orbit turntable is mounted on the sliding platform and rotated by motor 2; the linear slide is mounted on a sliding platform on one side of the elliptical orbit turntable, the reciprocating slide is mounted on the linear slide and slides, and the elliptical orbit turntable is provided with a cross-shaped slide groove, and a slider is respectively installed in the transverse and longitudinal slide grooves of the cross-shaped slide groove, and fixing pin holes are provided at both ends of the measuring rod and at a point other than the two ends, and pin shafts are installed in the three fixing pin holes and are respectively fixed to the reciprocating slide and the two sliders; the main line clamping block is fixed on the overhead high-voltage cable, and a plurality of adjustment holes are provided on the measuring rod, one end of the trajectory copying rod is fixedly connected to the main line clamping block, and the other end is installed in the adjustment hole of the measuring rod through a pin shaft.

[0011] Preferably, the sliding platform is provided with two upright pole mounting holes, and two supporting upright poles are penetrated through the two upright pole mounting holes of the sliding platform. The base frame is respectively penetrated with platform lifting screws through two platform screw lifting mechanisms. The top end of the platform lifting screw is installed on the lower end surface of the sliding platform through a bearing. The two platform screw lifting mechanisms can control the sliding of the sliding platform on the supporting upright poles to adjust the height of the sliding platform.

[0012] Preferably, the concentric swing adjustment mechanism comprises a swing rod and a transverse rod. Two swing rods are provided, and their front ends are respectively hinged on two supporting uprights, and the transverse rod is fixedly connected between the rear ends of the two swing rods; the front end of the drainage line is fixedly connected to the overhead high-voltage cable through a connecting wire clamp, and the rear end of the drainage line is fixed to the high current generator through the transverse rod; the front end hinge points and the connecting wire clamps of the two swing rods are at the same height and on a straight line, and the swing rods are controlled to swing through a branch line swing control mechanism.

[0013] Preferably, the branch line swing control mechanism includes a swing slide rail, a swing slider, a connecting shaft rod, an end joint, a shaft rod lifting screw and a branch line screw lifting mechanism, the swing slide rail is installed on the swing rod, the swing slider is installed on the swing slide rail to slide and is locked and fixed by screws or handles, both ends of the connecting shaft rod are fixed to the swing slider and the end joint through bearings respectively, the lower end of the shaft rod lifting screw is installed on the base frame through the branch line screw lifting mechanism, and the upper end is fixed to the end joint through a bearing; the lifting and lowering of the shaft rod lifting screw can be controlled by the branch line screw lifting mechanism, and then the height of the end joint, the connecting shaft rod and the swing slider can be controlled, so that the swing slider slides on the swing slide rail, thereby controlling the swing of the swing rod.

[0014] Preferably, the electric axial loading mechanism is installed at the center of the transverse rod, and the electric axial loading mechanism is fixed to the drainage line through a force measuring fixture. The rear end of the drainage line is connected to the high current generator after being fixed by the force measuring fixture; the electric axial loading mechanism uses a universal electric cylinder as a loading power source, and then realizes the direction of the loading force with the non-load-bearing connecting wire clamp pointing to the center of the circle and the direction of the loading force with the center line of the drainage line, and uses the universal electric cylinder to adjust the acceleration stress of the axial tensioning force of the drainage line under the condition that meets the actual working conditions.

[0015] Preferably, the force measuring fixture is composed of a strain wire clamp located at the front end and a force sensor located at the rear end, and the overhead high-voltage cable or drainage line is fixed in the strain wire clamp at the front end of the force measuring fixture; the fixing fixture is composed of a strain wire clamp located at the front end and a wire clamp fixing seat located at the rear end, and the overhead high-voltage cable is fixed in the strain wire clamp at the front end of the fixing fixture.

[0016] The beneficial effects of the present invention are:

[0017] (1) The non-load-bearing splice clamp acceleration test bench of the present invention can perform a tensile loading test on an overhead high-voltage cable through a universal tensile loading mechanism, a frequency modulation deformation excitation test on an overhead high-voltage cable through a frequency modulation deformation excitation mechanism, and a concentric swing adjustment mechanism and an electric axial loading mechanism to respectively perform concentric swing and axial loading tests on the drainage line. During the test, the test data is obtained through a measurement system and uploaded to a PC host computer. The test process can be controlled by a PC host computer and a high current generator. The non-load-bearing splice clamp acceleration test bench of the present invention has a compact structure and can perform accelerated tests such as tensile loading, frequency modulation deformation excitation, concentric swing and axial loading on non-load-bearing splice clamps, thereby realizing the monitoring and evaluation of the life expectancy and performance degradation of non-load-bearing splice clamps with high accuracy, safety and reliability.

[0018] (2) The non-load-bearing splice clamp accelerated test bench of the present invention can simulate the wind-induced vibration, high mechanical load and high current load of the connecting cable and its own installation under the real distribution network environment, and can regulate the following accelerated stresses according to the requirements of the accelerated life test or accelerated degradation test under constant, stepping and cyclic stress: 1. The amplitude, frequency, vibration shape and vibration direction of wind-induced vibration, 2. The tension of the overhead high-voltage cable, 3. The tension and direction angle of the drainage line, 4. The type, size and frequency of the conduction current. It can adapt to 50-240mm 2 Various types and models of non-load-bearing splicing clamps such as parallel groove clamps, piercing clamps, C-type clamps, amp clamps, cylindrical clamps, etc. for cables within the size range, thus providing solutions for comprehensive research on the failure mechanism of non-load-bearing splicing clamps and accurate and rapid evaluation of the life and performance of non-load-bearing splicing clamps under actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : A schematic diagram of the structure of the present invention;

[0020] Figure 2 : Schematic diagram of the structure of the mechanical system in the present invention Figure 1 (front left direction);

[0021] Figure 3 : Schematic diagram of the structure of the mechanical system in the present invention Figure 2 (looking up from the rear);

[0022] Figure 4 : A schematic structural diagram of the concentric swing adjustment mechanism of the present invention;

[0023] Figure 5 : Schematic diagram of the structure of the mechanical system in the present invention Figure 3 (looking down from the rear);

[0024] Figure 6 : A schematic diagram of the structure of the frequency modulation deformation excitation mechanism in the present invention;

[0025] Figure 7 : A schematic structural diagram of the force measuring fixture of the present invention;

[0026] Figure 8 : A schematic structural diagram of the fixing fixture in the present invention.

[0027] Among them, 100, overhead high-voltage cable, 200, drainage line, 300, connecting wire clamp, 400, mechanical system, 500, high current generator, 600, PC host computer, 1, base frame, 2, suspension frame, 21, horizontal flat plate, 22, support pole, 23, auxiliary support rod, 3, universal tension loading mechanism, 31, upright screw, 32, main line pull plate, 33, pull plate support, 34, passive wheel, 35, motor one, 36, driving wheel, 4, frequency modulation deformation excitation mechanism, 41, sliding platform, 411, pole mounting hole, 42, elliptical track turntable, 421, motor two, 422, slider, 43, linear slide rail, 44, reciprocating slide, 45, foot rod, 451, fixed pin hole, 46, track copy rod, 47, main line clamping block, 48, platform lifting screw, 49, platform screw lifting mechanism, 5. Concentric swing adjustment mechanism, 51. Swing rod, 52. Transverse rod, 53. Swing slide rail, 54. Swing slider, 55. Connecting shaft rod, 56. End joint, 57. Shaft rod lifting screw, 6. Electric axial loading mechanism, 7. Force measuring fixture, 71. Tension wire clamp, 72. Force sensor, 8. Fixing fixture, 81. Wire clamp fixing seat. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Embodiment 1:

[0029] Reference Figure 1-8 The present invention proposes a non-load-bearing splice clamp acceleration test bench, which is used for the acceleration test of a splice clamp 300 connecting an overhead high-voltage cable 100 and a drain wire 200, and includes a mechanical system 400, a large current generator 500, a measurement system and a PC host computer 600.

[0030] The mechanical system 400 consists of a system frame, a universal tensile loading mechanism 3, a frequency modulation deformation excitation mechanism 4, a concentric swing adjustment mechanism 5 and an electric axial loading mechanism 6. The overhead high-voltage cable 100, the drainage line 200, the universal tensile loading mechanism 3, the frequency modulation deformation excitation mechanism 4, the concentric swing adjustment mechanism 5 and the electric axial loading mechanism 6 are all installed in the system frame.

[0031] The high current generator 500 is installed outside the mechanical system 400, and the positive pole of the high current generator 500 is connected to the overhead high voltage cable 100, and the negative pole is connected to the drainage line 200. A current tester is provided inside the high current generator 500, and is connected to the PC host computer 600 through serial port communication.

[0032] A protective frame 700 and a transparent protective glass or acrylic plate are installed outside the mechanical system 400 and the high current generator 500. The measuring system includes a micro-ohmmeter, a force sensor, a displacement sensor and a temperature sensor, which are all installed in the mechanical system 400. The measuring system is connected to the PC host computer 600 through serial communication.

[0033] The PC host computer 600 is installed on the outside of the protection frame 700. The PC host computer 600 is installed with third-party relay protection software, Labview software and an accelerated failure processing interface. The accelerated failure processing interface is used to control the accelerated test of the non-load-bearing splicing clamp, and then the universal tension loading mechanism 3 can be used to perform tension loading on the overhead high-voltage cable 100. The frequency modulation deformation excitation mechanism 4 can perform a frequency modulation deformation excitation test on the overhead high-voltage cable 100. The concentric swing adjustment mechanism 5 and the electric axial loading mechanism 6 can respectively perform concentric swing and axial loading tests on the drainage line 200.

[0034] Example 2:

[0035] Reference Figure 1-8The present invention proposes a non-load-bearing splice clamp acceleration test bench, which is used for the acceleration test of a splice clamp 300 connecting an overhead high-voltage cable 100 and a drain wire 200, and includes a mechanical system 400, a large current generator 500, a measurement system and a PC host computer 600.

[0036] The large current generator 500 is installed outside the mechanical system 400, and the positive electrode of the large current generator 500 is connected to the overhead high-voltage cable 100, and the negative electrode is connected to the drain line 200. A current tester is provided inside the large current generator 500, and it is connected to the PC host computer 600 through serial communication. A protective frame 700 and a transparent protective glass or acrylic plate are installed outside the mechanical system 400 and the large current generator 500. The protective frame 700 and the transparent protective glass or acrylic plate can protect the mechanical system 400 and the large current generator 500, which is safe and reliable.

[0037] The mechanical system 400 consists of a system frame, a universal tensile loading mechanism 3, a frequency modulation deformation excitation mechanism 4, a concentric swing adjustment mechanism 5 and an electric axial loading mechanism 6. The overhead high-voltage cable 100, the drainage line 200, the universal tensile loading mechanism 3, the frequency modulation deformation excitation mechanism 4, the concentric swing adjustment mechanism 5 and the electric axial loading mechanism 6 are all installed in the system frame.

[0038] The system rack includes a base rack 1 and a suspension rack 2. The suspension rack 2 is a door-shaped structure composed of two support poles 22 and a horizontal flat plate 21. The bottom ends of the support poles 22 are fixed to the base rack 1. Auxiliary support poles 23 are arranged on the outside of the two support poles 22. The upper ends of the auxiliary support poles 23 are fixed to the support poles 22. The lower ends of the base rack 1 and the auxiliary support poles 23 are placed on the ground platform.

[0039] The universal tension loading mechanism 3 includes an upright screw rod 31 and a main line pull plate 32. Two upright screw rods 31 are provided and are respectively installed on the inner sides of the two supporting uprights 22. The upper end of the upright screw rod 31 is fixed on the horizontal plate 21 through a bearing, and the lower end thereof is installed on the base frame 1 through a bearing. Four through holes are provided on the main line pull plate 32. The two supporting uprights 22 and the two upright screw rods 31 are respectively penetrated in the four through holes of the main line pull plate 32, and a pull plate support 33 is installed in the through hole connecting the upright screw rod 31 and the main line pull plate 32. The pull plate support 33 is connected to the upright screw rod 31 through a threaded connection, and the upright screw rod 31 is rotated by controlling a motor 35. The lower end of the vertical screw rod 31 passes through the base frame 1, and the connection between the vertical screw rod 31 and the base frame 1 is fixedly installed through a bearing. A passive wheel 34 is installed at the bottom end of the vertical screw rod 31, and a motor 35 is installed in the base frame 1, and a driving wheel 36 is installed on its output shaft. The driving wheel 36 is connected to the passive wheels 34 on the two vertical screw rods 31 through belts.

[0040] The upper end of the overhead high-voltage cable 100 is protected by an insulating cap and fixed to the main line pull plate 32 by a force measuring fixture 7. A fixing fixture 8 is installed on the upper end surface of the base frame 1. The lower end of the overhead high-voltage cable 100 is connected to the large current generator 500 after being fixed by the fixing fixture 8. The two passive wheels 34 are driven to rotate synchronously by controlling the motor 1 35 to start, so that the main line pull plate 32 is lifted and lowered by the rotation of the upright screw rod 31, thereby the overhead high-voltage cable 100 can be tensioned and the high-precision and large-range tensioning of the overhead high-voltage cable 100 can be achieved, thereby meeting the test requirements of the acceleration test for the constant, stepping, and cyclic loading methods of the tensioning force of the overhead high-voltage cable 100.

[0041] The frequency modulation deformation excitation mechanism 4 includes a sliding platform 41, an elliptical orbit turntable 42, a linear slide 43, a reciprocating slide 44, a foot measuring rod 45, a track copy rod 46 and a main line clamping block 47. The sliding platform 41 is fixedly mounted on two supporting uprights 22 on one side of the overhead high-voltage cable 100. The elliptical orbit turntable 42 is mounted on the sliding platform 41 and controlled to rotate by a motor 2 421. The linear slide 43 is mounted on the sliding platform 41 on one side of the elliptical orbit turntable 42. The reciprocating slide 44 is mounted on the linear slide 43 and slides. A cross-shaped slide groove is provided on the elliptical orbit turntable 42. A slider 422 is respectively installed in the horizontal and longitudinal slide grooves of the cross-shaped slide groove. The foot measuring rod 45 is provided with fixed pin holes 451 at both ends and a point other than the two ends. Pin shafts are installed in the three fixed pin holes 451 and are respectively fixed to the reciprocating slide 44 and the two sliders 422. The main line clamping block 47 is fixed on the overhead high-voltage cable 100, and a plurality of adjustment holes are provided on the measuring foot rod 45. One end of the trajectory copying rod 46 is fixedly connected to the main line clamping block 47, and the other end is installed in the adjustment hole of the measuring foot rod 45 through a pin shaft.

[0042] The rotation of the elliptical orbit turntable 42 can be driven by the motor 2 421, and one end of the measuring rod 45 pulls the reciprocating slide 44 to slide on the linear slide rail 43, and the other end and two sliders 422 installed at a point other than the two ends slide in the cross-shaped slide groove of the elliptical orbit turntable 42, and the trajectory copying rod 46 is controlled by the measuring rod 45 to perform a torsional movement on the overhead high-voltage cable 100 fixed at one end. Therefore, the frequency-modulated deformation excitation mechanism 4 is a reverse design of the ellipsometer, which can simulate wind-induced vibrations in accordance with actual working conditions and achieve a certain range of elliptical vibration shapes and circular vibration shapes. The vibration frequency of the non-load-bearing splicing clamp 300 is regulated by changing the rotation speed of the motor 2 421 through the main line clamping block 47, and the amplitude is adjusted by changing the length of the trajectory copying rod 46 and the measuring rod 45, thereby meeting the requirements of the accelerated test for constant, stepping, and cyclic loading methods for this type of stress.

[0043] The frequency modulation deformation excitation mechanism 4 adjusts the clamping distance between the V-shaped main line clamping block 47 and the track copying rod 46 by controlling the bolt tightening stroke at both ends of the V-shaped main line clamping block 47, thereby realizing automatic centering clamping and excitation force transmission for overhead high-voltage cables 100 of different wire diameters. The combination of the rapid tightening and loosening of the bolts and the automatic centering of the V-shaped block can effectively clamp overhead high-voltage cables 100 of different wire diameters, and can resist the additional vibration load caused by the excitation during the accelerated test to a certain extent.

[0044] Among them, two vertical pole mounting holes 411 are arranged on the sliding platform 41, and two supporting vertical poles 22 are penetrated in the two vertical pole mounting holes 411 of the sliding platform 41. Platform lifting screw rods 48 are respectively penetrated and installed on the base frame 1 through two platform screw rod lifting mechanisms 49. The top end of the platform lifting screw rod 48 is installed on the lower end surface of the sliding platform 41 through a bearing. The two platform screw rod lifting mechanisms 49 can control the sliding of the sliding platform 41 on the supporting vertical poles 22 to adjust the height of the sliding platform 41, thereby realizing the selection and adjustment of the fixing points of the main line clamping block 47 of the frequency modulation deformation excitation mechanism 4 and the overhead high-voltage cable 100.

[0045] The concentric swing adjustment mechanism 5 includes a swing rod 51 and a transverse rod 52. Two swing rods 51 are provided, and their front ends are respectively hinged on two supporting upright rods 22, and the transverse rod 52 is fixedly connected between the rear ends of the two swing rods 51. The front end of the drain wire 200 is protected by an insulating cap and is fixedly connected to the overhead high-voltage cable 100 through a connecting wire clamp 300. The rear end of the drain wire 200 is fixed by the transverse rod 52 and connected to the high-current generator 500.

[0046] The front end hinge points of the two swing rods 51 and the connecting wire clamp 300 are at the same height and located in a straight line, ensuring that the swing center is the position of the connecting wire clamp 300. The swing of the swing rods 51 is controlled by the branch line swing control mechanism.

[0047] The branch line swing control mechanism includes a swing rail 53, a swing slider 54, a connecting shaft 55, an end joint 56, a shaft lifting screw 57 and a branch line screw lifting mechanism. The swing rail 53 is installed on the swing rod 51, the swing slider 54 is installed on the swing rail 53 to slide and is locked and fixed by screws or handles, both ends of the connecting shaft 55 are fixedly installed with the swing slider 54 and the end joint 56 through bearings, and the lower end of the shaft lifting screw 57 is installed on the base frame 1 through the branch line screw lifting mechanism, and its upper end is fixedly installed with the end joint 56 through a bearing. The lifting and lowering of the shaft lifting screw 57 can be controlled by the branch line screw lifting mechanism, and then the height of the end joint 56, the connecting shaft 55 and the swing slider 54 can be controlled, so that the swing slider 54 slides on the swing rail 53, thereby controlling the swing rod 51 to swing.

[0048] The concentric swing adjustment mechanism 5 is driven to adjust the angle between the drain line 200 and the overhead high-voltage cable 100 to an initial value. In the subsequent test process, it can be adjusted online according to demand, that is, the real-time regulation of the tensioning force angle of the drain line 200 is realized, and the drain line can swing 20-120°, which is consistent with the actual working conditions and meets the requirements of the accelerated test for constant, step, and cyclic loading methods for this type of stress.

[0049] The electric axial loading mechanism 6 is installed at the center of the horizontal rod 52. The electric axial loading mechanism 6 is fixed to the drainage line 200 through the force measuring fixture 7. The rear end of the drainage line 200 is connected to the large current generator 500 after being fixed by the force measuring fixture 7. The electric axial loading mechanism 6 uses a universal electric cylinder as a loading power source, and then realizes the direction of the loading force with the non-load-bearing connecting wire clamp 300 pointing to the center of the circle and the direction of the loading force with the axis of the drainage line. The advantages of the universal electric cylinder can be used to flexibly adjust the acceleration stress of the axial tension of the drainage line 200 under the condition that meets the actual working conditions. The electric cylinder set in the electric axial loading mechanism 6 can achieve a tension within 1500N, and the PC host computer 600 can realize online real-time control of the load value, meeting the requirements of the acceleration test for constant, stepping, and cyclic loading methods for this type of stress.

[0050] The force measuring fixture 7 is composed of a strain clamp 71 at the front end and a force sensor 72 at the rear end, and the overhead high-voltage cable 100 or the drain wire 200 is fixed in the strain clamp 71 at the front end of the force measuring fixture 7. The fixing fixture 8 is composed of a strain clamp 71 at the front end and a clamp fixing seat 81 at the rear end, and the overhead high-voltage cable 100 is fixed in the strain clamp 71 at the front end of the fixing fixture 8.

[0051] The measuring system includes a micro-ohmmeter, a force sensor 72, a displacement sensor, a temperature sensor and an acquisition card, and all are installed in the mechanical system 400. The measuring system is connected to the PC host computer 600 through serial communication, and the PC host computer 600 processes the sensor data. Among them, the micro-ohmmeter measures the contact resistance formed between the non-load-bearing splicing clamp 300 and the overhead high-voltage cable 100 and the drain wire 200 by the four-wire method. The two force sensors 72 are respectively located in the force measuring fixture 7, and directly measure the tension of the overhead high-voltage cable 100 and the drain wire 200 respectively; the temperature sensor adopts a non-contact measurement and acquisition method, which is mainly used to monitor the internal temperature distribution of the splicing clamp 300; the displacement sensor detects the vibration frequency, amplitude, vibration shape and reciprocating vibration direction of the splicing clamp 300 by laser ranging.

[0052] The PC host computer 600 is installed on the outside of the protection frame 700. The third-party relay protection software, Labview software and accelerated failure processing interface are installed in the PC host computer 600. The accelerated failure processing interface is used to control the accelerated test of the non-load-bearing splicing clamp, and then the overhead high-voltage cable 100 can be subjected to tension loading through the universal tension loading mechanism 3, and the overhead high-voltage cable 100 can be subjected to frequency modulation deformation excitation test through the frequency modulation deformation excitation mechanism 4. The concentric swing adjustment mechanism 5 and the electric axial loading mechanism 6 can respectively perform concentric swing and axial loading tests on the drainage line 200, and the contact resistance formed by the distribution network non-load-bearing splicing clamp 300 and its connecting cables (overhead high-voltage cable 100 and drainage line 200) and the comprehensive performance of failure behaviors such as the jump of contact temperature during the accelerated test cycle and the obvious expansion of surface cracks are used as observation indicators for the accelerated test of the distribution network non-load-bearing splicing clamp 300. The PC host computer 600 is mainly used to process the signal data of the measurement system, and monitor and evaluate the life expectancy and performance degradation of non-load-bearing splicing clamps in combination with the high stress condition arrangement of the accelerated test and the product durability characteristic target value.

[0053] The non-load-bearing splicing clamp acceleration test bench of the present invention can perform a tensile loading test on an overhead high-voltage cable 100 through a universal tensile loading mechanism 3, can perform a frequency modulation deformation excitation test on an overhead high-voltage cable 100 through a frequency modulation deformation excitation mechanism 4, can perform a concentric swing and axial loading test on a drainage line 200 through a concentric swing adjustment mechanism 5 and an electric axial loading mechanism 6, respectively. During the test, the test data is obtained through a measurement system and uploaded to a PC host computer 600, and the test process can be controlled by the PC host computer 600 and a large current generator 500. The non-load-bearing splicing clamp acceleration test bench of the present invention has a compact structure, can perform accelerated tests such as tensile loading, frequency modulation deformation excitation, concentric swing and axial loading on non-load-bearing splicing clamps, and realizes monitoring and evaluation of the life expectancy and performance degradation of non-load-bearing splicing clamps, with high accuracy, safety and reliability.

[0054] The non-load-bearing splice clamp accelerated test bench of the present invention can simulate the wind-induced vibration, high mechanical load and high current load of the connecting cable and its own installation under the real distribution network environment, and can regulate the following accelerated stresses according to the requirements of the accelerated life test or accelerated degradation test under constant, stepping and cyclic stress: 1. The amplitude, frequency, vibration shape and vibration direction of wind-induced vibration, 2. The tension of the overhead high-voltage cable, 3. The tension and direction angle of the drainage line, 4. The type, size and frequency of the conduction current. It can adapt to 50-240mm 2Various types and models of non-load-bearing splicing clamps such as parallel groove clamps, piercing clamps, C-type clamps, amp clamps, cylindrical clamps, etc. for cables within the size range, thus providing solutions for comprehensive research on the failure mechanism of non-load-bearing splicing clamps and accurate and rapid evaluation of the life and performance of non-load-bearing splicing clamps under actual working conditions.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A non-load-bearing splice clamp acceleration test bench, used for an acceleration test of a splice clamp (300) connecting an overhead high-voltage cable (100) and a drain wire (200), characterized in that: The invention comprises a mechanical system (400), a high current generator (500), a measuring system and a PC host computer (600), wherein the mechanical system (400) is composed of a system frame, a universal tensile loading mechanism (3), a frequency modulation deformation excitation mechanism (4), a concentric swing adjustment mechanism (5) and an electric axial loading mechanism (6), and the overhead high-voltage cable (100), a drainage line (200), the universal tensile loading mechanism (3), the frequency modulation deformation excitation mechanism (4), the concentric swing adjustment mechanism (5) and the electric axial loading mechanism (6) are all installed in the system frame; The positive electrode of the large current generator (500) is connected to the overhead high-voltage cable (100), and the negative electrode thereof is connected to the drainage line (200). The large current generator (500) is connected to the PC host computer (600) via serial port communication. The measuring system comprises a micro-ohmmeter, a force sensor, a displacement sensor and a temperature sensor, and all are installed in the mechanical system (400). The measuring system is connected to a PC host computer (600) via serial communication. The universal tensile loading mechanism (3) can be used to perform tensile loading on the overhead high-voltage cable (100); the frequency modulation deformation excitation mechanism (4) can be used to perform a frequency modulation deformation excitation test on the overhead high-voltage cable (100); and the concentric swing adjustment mechanism (5) and the electric axial loading mechanism (6) can be used to perform concentric swing and axial loading tests on the drainage wire (200) respectively; The frequency modulation deformation excitation mechanism (4) comprises a sliding platform (41), an elliptical orbit turntable (42), a linear slide rail (43), a reciprocating slide (44), a foot measuring rod (45), a track copying rod (46) and a main line clamping block (47); the sliding platform (41) is fixedly mounted on a system frame on one side of the overhead high-voltage cable (100); the elliptical orbit turntable (42) is mounted on the sliding platform (41) and is controlled to rotate by a second motor (421); the linear slide rail (43) is mounted on the sliding platform (41) on one side of the elliptical orbit turntable (42); the reciprocating slide (44) is mounted on the linear slide rail (43) and slides; the elliptical orbit turntable (42) is mounted on the sliding platform (41) and is controlled to rotate by a second motor (421); A cross-shaped slide groove is provided on the track turntable (42), and a slider (422) is installed in the transverse and longitudinal slide grooves of the cross-shaped slide groove respectively; the two ends of the measuring rod (45) and a point other than the two ends are provided with fixed pin holes (451), and pin shafts are installed in the three fixed pin holes (451) and are respectively fixed to the reciprocating slide table (44) and the two sliders (422); the main line clamping block (47) is fixed on the overhead high-voltage cable (100), and the measuring rod (45) is provided with a plurality of adjustment holes; one end of the track copying rod (46) is fixedly connected to the main line clamping block (47), and the other end is installed in the adjustment hole of the measuring rod (45) through a pin shaft.

2. The non-load-bearing splice clamp accelerated test bench according to claim 1, characterized in that: The system frame comprises a base frame (1) and a suspension frame (2); the suspension frame (2) is a door-shaped structure composed of two support vertical rods (22) and a horizontal flat plate (21); the bottom ends of the support vertical rods (22) are fixed to the base frame (1); auxiliary support rods (23) are arranged on the outside of the two support vertical rods (22); the upper ends of the auxiliary support rods (23) are fixed to the support vertical rods (22); and the lower ends of the base frame (1) and the auxiliary support rods (23) are both placed on a ground platform.

3. The non-load-bearing splice clamp accelerated test bench according to claim 2, characterized in that: The universal tension loading mechanism (3) comprises a vertical screw rod (31) and a main line pull plate (32), wherein two vertical screw rods (31) are provided and are respectively installed on the inner sides of two supporting upright rods (22), the upper end of the vertical screw rod (31) is fixed on the horizontal plate (21) through a bearing, and the lower end thereof is installed on the base frame (1) through a bearing, and the main line pull plate (32) is provided with four through holes, and the two supporting upright rods (22) and the two vertical screw rods (31) are respectively installed in the four through holes of the main line pull plate (32), and the vertical screw rod (3 1) A pull plate support (33) is installed in a through hole connected to the main line pull plate (32), the pull plate support (33) is connected to the upright screw rod (31) by means of a thread, and the upright screw rod (31) is controlled to rotate by a motor 1 (35); the upper end of the overhead high-voltage cable (100) is fixed to the main line pull plate (32) by means of a force measuring fixture (7), a fixing fixture (8) is installed on the upper end surface of the base frame (1), and the lower end of the overhead high-voltage cable (100) is connected to a high current generator (500) after being fixed by the fixing fixture (8).

4. The non-load-bearing splice clamp accelerated test bench according to claim 3, characterized in that: The lower end of the vertical screw rod (31) passes through the base frame (1), and the connection between the vertical screw rod (31) and the base frame (1) is fixedly installed via a bearing. A passive wheel (34) is installed at the bottom end of the vertical screw rod (31). The motor 1 (35) is installed in the base frame (1), and a driving wheel (36) is installed on its output shaft. The driving wheel (36) is connected to the passive wheels (34) on the two vertical screw rods (31) via a belt.

5. The non-load-bearing splice clamp accelerated test bench according to claim 2, characterized in that: The sliding platform (41) is fixedly mounted on two supporting uprights (22) on one side of the overhead high-voltage cable (100); two upright mounting holes (411) are provided on the sliding platform (41); the two supporting uprights (22) are penetrated through the two upright mounting holes (411) of the sliding platform (41); platform lifting screw rods (48) are respectively penetrated and installed on the base frame (1) through two platform screw rod lifting mechanisms (49); the top end of the platform lifting screw rod (48) is mounted on the lower end surface of the sliding platform (41) through a bearing; and the sliding platform (41) can be controlled to slide on the supporting uprights (22) through the two platform screw rod lifting mechanisms (49) to adjust the height of the sliding platform (41).

6. The non-load-bearing splice clamp accelerated test bench according to claim 3, characterized in that: The concentric swing adjustment mechanism (5) comprises a swing rod (51) and a transverse rod (52); two swing rods (51) are provided, and their front ends are respectively hinged on two supporting upright rods (22); the transverse rod (52) is fixedly connected between the rear ends of the two swing rods (51); the front end of the drain wire (200) is fixedly connected to the overhead high-voltage cable (100) via a connecting wire clamp (300); the rear end of the drain wire (200) is fixedly connected to the high-current generator (500) via the transverse rod (52); the front end hinge points of the two swing rods (51) and the connecting wire clamp (300) are at the same height and located on a straight line; the swing rods (51) are all controlled to swing by a branch line swing control mechanism.

7. The non-load-bearing splice clamp accelerated test bench according to claim 6, characterized in that: The branch line swing control mechanism comprises a swing rail (53), a swing slider (54), a connecting shaft (55), an end joint (56), a shaft lifting screw (57) and a branch line screw lifting mechanism, wherein the swing rail (53) is mounted on the swing rod (51), the swing slider (54) is mounted on the swing rail (53) to slide and is locked and fixed by screws or handles, both ends of the connecting shaft (55) are respectively fixedly mounted with the swing slider (54) and the end joint (56) by bearings, the lower end of the shaft lifting screw (57) is installed on the base frame (1) through the branch line screw lifting mechanism, and the upper end is fixedly mounted with the end joint (56) by bearings; the lifting and lowering of the shaft lifting screw (57) can be controlled by the branch line screw lifting mechanism, thereby controlling the height of the end joint (56), the connecting shaft (55) and the swing slider (54), so that the swing slider (54) slides on the swing rail (53), thereby controlling the swinging of the swing rod (51).

8. The non-load-bearing splice clamp accelerated test bench according to claim 6, characterized in that: The electric axial loading mechanism (6) is installed at the center of the transverse rod (52), and the electric axial loading mechanism (6) is fixed to the drainage line (200) through a force measuring fixture (7). The rear end of the drainage line (200) is connected to the large current generator (500) after being fixed by the force measuring fixture (7). The electric axial loading mechanism (6) uses a universal electric cylinder as a loading power source, thereby realizing a loading force pointing to the center of a circle with the non-load-bearing connecting wire clamp (300) as the loading force, and the axial center line of the drainage line (200) as the loading force action direction, and uses the universal electric cylinder to adjust the acceleration stress of the axial tensioning force of the drainage line (200) under conditions that meet actual working conditions.

9. The non-load-bearing splice clamp accelerated test bench according to claim 8, characterized in that: The force measuring fixture (7) is composed of a strain wire clamp (71) located at the front end and a force sensor (72) located at the rear end, and the overhead high-voltage cable (100) or the drain wire (200) is fixed in the strain wire clamp (71) at the front end of the force measuring fixture (7); the fixing fixture (8) is composed of a strain wire clamp (71) located at the front end and a wire clamp fixing seat (81) located at the rear end, and the overhead high-voltage cable (100) is fixed in the strain wire clamp (71) at the front end of the fixing fixture (8).

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