Bending resistance testing device for cold-pressed joint of power cable

Abstract

The utility model discloses a bending resistance testing device for a cold-pressed joint of a power cable, which comprises a rack, a rotating frame is horizontally and rotatably arranged above the rack, and the rotating frame is in power connection with a motor on the rack; a plurality of fixing seats are arranged on the rotating frame, and crimping terminals of cables are fixedly connected to the fixing seats; a plurality of guide assemblies corresponding to the fixed seats are mounted on the side of the rack, each guide assembly comprises two guide rollers which are correspondingly arranged up and down, and a cable is arranged between the two guide rollers in a penetrating manner; two ends of the cable are connected with a weak current power supply, and the cable is also connected with a current detector; the rack is further provided with a control module, and the motor and the current detector are electrically connected with the control module. The device can detect a plurality of cables at the same time, can meet the detection requirements of cables of different models, is high in detection efficiency, can detect the breaking condition of the cables in time, and is more labor-saving and efficient.

Description

Technical Field

[0001] The utility model belongs to the field of cable detection equipment, and particularly relates to a test device for the bending resistance of cold-pressed joints of power cables. Background Technique

[0002] In order to cope with the environmental problems and energy security problems brought about by development, the country is continuously accelerating the pace of replacing traditional energy sources such as coal and oil with electricity. Electricity is integrated into people's lives more and more deeply, and its stable supply is extremely important. Electricity is transmitted and distributed by the power grid. Generally, the power grid is composed of many sections of overhead bare conductors or insulated cables connected together. Cold-pressed terminal blocks are needed to connect different sections together to make the entire power transmission line unblocked. Cables are flexible and will swing back and forth in the wind. The conductors at the cable joints will deform during crimping, and even obvious indentations will appear. This place is the most vulnerable. Repeated bending will cause the wire to break, resulting in the interruption of power supply, affecting life and production, and even leading to accidents.

[0003] To improve the reliability of power supply, technicians are continuously improving the terminal blocks for different application scenarios. For the improved terminal blocks, there is currently no unified performance test method. Technicians mainly rely on on-site actual use for verification, but this test method takes a long time, and at the same time, it cannot ensure the same test conditions, and there are errors in the test results. The utility model patent with the authorization announcement number CN214668279U invented a test device for the bending reliability of wire and cable crimping terminals. This device is mainly used to test relatively soft wire and cable such as automotive wire harnesses with a relatively thin wire diameter. The force required for this type of cable to swing and bend is small. For the cables used in power transmission lines, their wire diameters are relatively thick, and some have a steel core inside or a relatively thick insulating layer outside. The joints of this type of power cable usually will not be bent to 90°. However, the device described in the above patent can only be bent 180° in the horizontal plane, that is, about 90° left and right, and is not suitable for the bending test of power cable joints. And the existing bending detection equipment requires manual judgment on whether the cable is broken, and the detection personnel need to stay beside the testing machine all the time, resulting in a lot of time waste and increased labor costs. Content of the Utility Model

[0004] In order to solve the deficiencies of the prior art, the utility model aims to provide a test device for the bending resistance of cold-pressed joints of power cables. This device can detect multiple cables at the same time, and can meet the detection requirements of different types of cable joints, with high detection efficiency, can detect the breaking situation in time, and is more labor-saving and efficient.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A bending resistance test device for cold-pressed joints of power cables, comprising a frame. Above the frame, a rotating frame is horizontally rotatably arranged, and the rotating frame is power-connected to a motor on the frame. A plurality of fixing seats are arranged on the rotating frame, and the crimping terminals of the cables are fixedly connected to the fixing seats. A plurality of guiding components corresponding to the fixing seats are installed on the side of the frame. The guiding component includes two guiding rollers arranged vertically corresponding to each other, and the cable is threaded between the two guiding rollers. Both ends of the cable are connected to a weak current power supply, and a current detector is also connected to the cable. A control module is also installed on the frame, and the motor and the current detector are electrically connected to the control module.

[0007] Preferably, the fixing seat includes a fixing plate and a pressing plate. The pressing plate presses the crimping terminal of the cable on the fixing plate. After the fixing bolt passes through the connection holes on the pressing plate and the crimping terminal, its end is fixed in the mounting hole on the fixing plate.

[0008] Preferably, a plurality of mounting holes on the fixing plate are arranged at equal intervals.

[0009] Preferably, the fixing plate is a U-shaped plate, and the pressing plate and the crimping terminal of the cable are installed at the inner bottom of the opening of the U-shaped plate.

[0010] Preferably, bearing seats are horizontally and correspondingly installed on the frame. Rotating shafts are fixedly arranged on both sides of the rotating frame, and the rotating shafts are rotatably installed on the bearings of the bearing seats. The rotating shaft on one side is connected to the output shaft of the motor through a coupling.

[0011] Preferably, the two guiding rollers are respectively an upper guiding roller and a lower guiding roller. The lower guiding roller is fixed on the frame, and the upper guiding roller is installed on an adjusting frame. The adjusting frame is installed on the frame in a vertically adjustable manner.

[0012] Preferably, both sides of the lower guiding roller are installed on a sleeve rod, and the two sleeve rods are vertically fixed on the frame. The adjusting frame includes an adjusting member, two sliding rods and a connecting rod. The two sliding rods are respectively vertically slidably sleeved in the sleeve rods. The connecting rod is perpendicularly fixed to the upper ends of the two sliding rods, and the upper guiding roller is horizontally installed between the two sliding rods. The adjusting member installed on the frame is connected to the connecting rod.

[0013] Preferably, the adjusting member includes a screw rod and a hand wheel. The lower end of the screw rod is threadedly penetrated through the top of the frame and rotatably installed on the connecting rod, and the hand wheel is installed on the upper end of the screw rod.

[0014] Preferably, a limiting rod is vertically arranged in the installation groove opened in the middle of the sliding rod. A slider is slidably sleeved on the limiting rod, and a spring is also sleeved on the limiting rod. Both ends of the spring respectively abut against the slider and the top of the groove. The end of the upper guiding roller is installed on the slider.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. By controlling the rotation angle of the motor in the forward and reverse directions, the utility model can drive the rotating frame to rotate by a certain angle through the coupling, and can detect different bending angles of cable joints of different models.

[0017] 2. A plurality of mounting holes on the fixing plate are arranged at equal intervals. According to the spacing of the connection holes of the cable crimping terminals of different models, after replacing the pressure plate, it can be fixed in the corresponding mounting holes by using the fixing bolts, and the fixed installation is very convenient, which can meet the fixing needs of different models of crimping terminals.

[0018] 3. By driving the screw rod to rotate through the hand wheel, under the sliding limit cooperation of the sliding rod and the sleeve rod, the upper guiding roller on the adjusting part can be driven to move up and down, so as to adjust the spacing between the upper guiding roller and the lower guiding roller, making the device adaptable to the guiding use of cables with different diameters. And the sliding rods on both sides can effectively limit the cable to prevent it from detaching from the two guiding rollers, so as to prevent the tail of the cable from swinging randomly during the detection process, causing damage to personnel or equipment.

[0019] 4. When the adjusting frame drives the upper guiding roller to move downward and press on the upper part of the cable, the spring will be compressed. Under the elastic force of the spring, the upper guiding roller can effectively contact the cable and limit the cable between the two guiding rollers.

[0020] 5. By applying weak electricity to both ends of the cable to be detected, when the current detector detects that the current of the weak electricity disappears, it indicates that the cable joint is broken. At this time, the control module records the actual bending times of the cable and controls the motor to stop, so that the device has functions such as automatic counting and disconnection protection, and can realize unattended operation during detection, saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the structural diagram of the utility model;

[0022] Figure 2 is the structural diagram of the rotating frame of the utility model;

[0023] Figure 3 is the installation schematic diagram of the guiding roller in Embodiment 2 of the utility model;

[0024] Figure 4 is the side sectional view of the sliding rod in Embodiment 3 of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The principle and features of the utility model will be described below with reference to the drawings. The examples given are only used to explain the utility model and do not limit the scope of use of the utility model.

[0026] Embodiment 1:

[0027] AsFigure 1-2 As shown in the figure, the present utility model proposes a test device for the bending resistance of cold-pressed joints of power cables 4, which includes a frame 1. Walking wheels are installed below the frame 1 to facilitate the movement of the device. A rotating frame 2 is horizontally rotatably provided above the frame 1, and the rotating frame 2 is power-connected to a motor 21 on the frame 1. Specifically, bearing seats 22 are horizontally and correspondingly installed on the frame 1. Rotating shafts are fixedly provided on both sides of the rotating frame 2, and the rotating shafts are rotatably installed on the bearings of the bearing seats 22. The rotating shaft on one side is connected to the output shaft of the motor 21 through a coupling. The motor 21 can drive the rotating frame 2 to rotate at a specified angle or torque according to the instructions of the control module 11. By controlling the rotation angles of the motor 21 in the forward and reverse directions, the rotating frame 2 can be driven through the coupling to rotate at a certain angle, and different bending angles of cable joints of different models can be detected.

[0028] A plurality of fixing seats 3 are provided on the rotating frame 2, and the crimping terminals 41 of the cable 4 are fixedly connected to the fixing seats 3. Specifically, the fixing seat 3 includes a fixing plate 31 and a pressing plate 32. The fixing plate 31 is a U-shaped plate, and the pressing plate 32 presses the crimping terminal 41 of the cable 4 against the inner bottom of the opening of the fixing plate 31. The U-shaped fixing plate 31 can effectively limit and fix the crimping terminal 41 of the cable 4 from both sides, avoiding the left and right swinging of the end of the cable 4 due to insecure fixation during the bending process. After the fixing bolt 33 passes through the connection holes on the pressing plate 32 and the crimping terminal 41, its end is threadedly fixed in the mounting hole 310 on the fixing plate 31. A plurality of mounting holes 310 are equidistantly provided on the fixing plate 31. According to the spacing of the connection holes of the crimping terminals 41 of different models of cables 4, after replacing the pressing plate 32, it can be fixed in the corresponding mounting hole 310 by using the fixing bolt 33. The fixed installation is very convenient and can meet the fixing requirements of different models of crimping terminals 41.

[0029] A plurality of guiding components corresponding to the fixing seats 3 are installed on the side of the frame 1. The guiding components include two guiding rollers arranged up and down correspondingly. The cable 4 is threaded between the two guiding rollers. The guiding rollers are designed with a thinner middle and thicker ends, which can effectively guide and limit the cable 4.

[0030] Both ends of the cable 4 are connected to a weak current power supply, and a current detector (not shown in the figure) is also connected to the cable 4. A control module 11 is also installed on the frame 1, and the motor 21 and the current detector are electrically connected to the control module 11. By applying a weak current to both ends of the cable 4 to be detected, when the current detector detects that the weak current disappears, it indicates that the joint of the cable 4 is broken. At this time, the control module 11 records the actual bending times of the cable 4 and controls the motor 21 to stop, so that the device has functions such as automatic counting and breakage protection, and can realize unattended operation during detection, saving manpower.

[0031] The control module 11 may specifically include a PLC controller, a display panel, and a power supply module. The power supply module converts external electrical energy into the power required for the motor 21 and the PLC controller, etc. The PLC controller can perform control logic programming and has functions such as controlling the motor 21 to rotate at a specified angle or torque, controlling the motor 21 to rotate a fixed number of times or for a certain time, setting the starting rotation angle, and recording the actual number of rotations, so as to adapt to different detection requirements. The display panel can display the current state of the device, and the operator can input control information through the display panel to control the device.

[0032] Embodiment 2:

[0033] As Figure 3 shown, the difference from the above Embodiment 1 is that in this embodiment, the two guiding rollers are respectively an upper guiding roller 51 and a lower guiding roller 52. The lower guiding roller 52 is fixed on the frame 1, and the upper guiding roller 51 is installed on the adjusting frame 6. The adjusting frame 6 is installed on the frame 1 in a vertically adjustable manner. Specifically, both sides of the lower guiding roller 52 are installed on the sleeve rods 12, and the two sleeve rods 12 are vertically fixed on the frame 1; the adjusting frame 6 includes an adjusting member, two sliding rods 61, and a connecting rod 62. The two sliding rods 61 are respectively sleeved on the sleeve rods 12 in a vertically sliding manner, and the connecting rod 62 is perpendicularly fixed to the upper ends of the two sliding rods 61. The upper guiding roller 51 is horizontally installed between the two sliding rods 61; the adjusting member includes a screw rod 63 and a hand wheel 64. The lower end of the screw rod 63 is threadedly penetrated through the top of the frame 1 and rotatably installed on the connecting rod 62, and the hand wheel 64 is installed on the upper end of the screw rod 63. By driving the screw rod 63 to rotate through the hand wheel 64, under the sliding limit cooperation between the sliding rod 61 and the sleeve rod 12, the upper guiding roller 51 on the adjusting member can be driven to move up and down, so as to adjust the distance between the upper guiding roller 51 and the lower guiding roller 52, enabling the device to adapt to the guiding use of cables 4 with different diameters. And the sliding rods 61 on both sides can effectively limit the cable 4 to prevent it from detaching from the two guiding rollers, preventing the tail of the cable 4 from swinging randomly during the detection process and causing damage to personnel or equipment.

[0034] Embodiment 3:

[0035] As Figure 4 shown, the difference from the above Embodiment 2 is that in this embodiment, a limiting rod 613 is vertically arranged in the installation groove 610 opened in the middle of the sliding rod 61. A slider 611 is slidably sleeved on the limiting rod 613, and a spring 612 is also sleeved on the limiting rod 613. Both ends of the spring 612 are respectively abutted against the slider 611 and the top of the groove; the end of the upper guiding roller 51 is installed on the slider 611. When the adjusting frame 6 drives the upper guiding roller 51 to move downward and press against the upper side of the cable 4, the spring 612 will be compressed. Under the elastic force of the spring 612, the upper guiding roller 51 can be effectively in contact with the cable 4, restricting the cable 4 between the two guiding rollers.

[0036] Obviously, the embodiments described above are only a part of the embodiments of this application, rather than all of them. The preferred embodiments of this application are given in the accompanying drawings, but they do not limit the patent scope of this application. This application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of this application more thorough and comprehensive. Although this application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure made by using the content of the specification and drawings of this application, directly or indirectly applied in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A power cable cold-pressed joint bending resistance testing device, comprising a frame, characterized in that: A rotating frame is provided above the frame for horizontal rotation, and the rotating frame is connected to the motor power on the frame; a plurality of fixed seats are provided on the rotating frame, and the crimping terminals of the cables are fixedly connected to the fixed seats; a plurality of guide components corresponding to the fixed seats are installed on the side of the frame, and the guide components include two guide rollers correspondingly arranged up and down, and the cable is passed between the two guide rollers; both ends of the cable are connected to a weak power supply, and a current detector is also connected to the cable; a control module is also installed on the frame, and the motor, the current detector and the control module are electrically connected.

2. The power cable cold-pressed joint bending resistance testing device according to claim 1 is characterized in that: The fixing seat comprises a fixing plate and a pressing plate. The pressing plate presses the crimping terminal of the cable onto the fixing plate. After the fixing bolt passes through the connecting holes on the pressing plate and the crimping terminal, the end of the fixing bolt is fixed in the mounting hole on the fixing plate.

3. The power cable cold-pressed joint bending resistance testing device according to claim 2 is characterized in that: The fixing plate is provided with a plurality of mounting holes at equal intervals.

4. The power cable cold-pressed joint bending resistance testing device according to claim 2 is characterized in that: The fixing plate is a U-shaped plate, and the pressing plate and the crimping terminals of the cable are installed at the bottom of the opening of the U-shaped plate.

5. The power cable cold-pressed joint bending resistance testing device according to claim 1 is characterized in that: The frame is horizontally and correspondingly mounted with a bearing seat, and rotating shafts are fixedly arranged on both sides of the rotating frame. The rotating shafts are rotatably mounted on the bearings of the bearing seat, and the rotating shaft on one side is connected to the output shaft of the motor through a coupling.

6. The power cable cold-pressed joint bending resistance testing device according to claim 1 is characterized in that: The two guide rollers are respectively an upper guide roller and a lower guide roller, the lower guide roller is fixed on the frame, and the upper guide roller is installed on the adjustment frame, and the adjustment frame is installed on the frame in an adjustable manner.

7. The power cable cold-pressed joint bending resistance testing device according to claim 6 is characterized in that: The two sides of the lower guide roller are installed on sleeve rods, and the two sleeve rods are vertically fixed on the frame; the adjustment frame includes an adjustment member, two sliding rods and a connecting rod, the two sliding rods are respectively slidably sleeved in the sleeve rods up and down, the connecting rod is perpendicular to the two sliding rods and fixedly connected to the upper end thereof, and the upper guide roller is horizontally installed between the two sliding rods; the adjustment member installed on the frame is connected to the connecting rod.

8. The power cable cold-pressed joint bending resistance testing device according to claim 7 is characterized in that: The adjusting member comprises a screw rod and a hand wheel. The thread at the lower end of the screw rod penetrates through the top of the frame and is rotatably mounted on the connecting rod. The hand wheel is mounted on the upper end of the screw rod.

9. The power cable cold-pressed joint bending resistance testing device according to claim 7 is characterized in that: A limit rod is vertically arranged in the installation groove opened in the middle of the slide rod, a sliding block is slidably sleeved on the limit rod, and a spring is also sleeved on the limit rod, and both ends of the spring are respectively abutted against the sliding block and the top of the groove; the end of the upper guide roller is installed on the sliding block.

Images