A cable withstand voltage test auxiliary device

Abstract

The present invention belongs to the technical field of high-voltage testing, and in particular, relates to a cable withstand voltage test auxiliary device, comprising a mounting frame and a plurality of vertical rods fixedly connected to the upper side wall of the mounting frame, wherein the plurality of vertical rods are evenly distributed on the left and right sides of the upper side wall of the mounting frame, and a clamping assembly is fixedly connected to the upper end of the vertical rod. After the withstand voltage test of a cable using the auxiliary device is completed, the present invention can automatically discharge the cable through the discharge assembly, thereby improving the efficiency of the cable withstand voltage test; it can also detect whether the internal charge of the cable is fully released, thereby improving the safety of the test; in addition, when the cable is about to break through the insulation layer due to quality problems, this situation can be detected, and the current transmitted to the cable can be disconnected, thereby reducing the breakdown of the cable insulation layer and the generation of harmful gases as much as possible, thereby better protecting the life of the cable.

Description

Technical Field

[0001] The invention belongs to the technical field of high voltage testing, and in particular relates to an auxiliary device for cable withstand voltage testing. Background Art

[0002] At present, in the construction process of new energy photovoltaic projects, it is inevitable to use long-distance, large-section AC cables for equipment connection. In order to detect the voltage resistance of the AC cables, it is necessary to perform a voltage resistance test on the AC cables. For example, a cable voltage resistance detection device is proposed in patent announcement number CN111007367B.

[0003] When the cable is undergoing a withstand voltage test, a high-voltage generator is required to transmit a high-voltage current to the cable for a certain period of time. During this process, the operator must determine whether there are abnormal phenomena such as breakdown and discharge in the insulation layer on the surface of the cable. After the test, a discharge rod is required to release the residual charge in the cable to the ground to ensure the safety of the operator. The charging process mainly relies on an external power supply to make the cable capacitance reach a certain voltage level in a relatively short period of time. The charging speed is relatively fast. During the discharge process, due to the existence of the cable's own capacitance and insulation resistance, the charge stored in the cable needs to be gradually released through the discharge rod. The charge release speed is slow. The time consumed by the cable discharge is usually several times the charging time, and it is difficult for the operator to judge the time when the charge inside the cable is completely released. If the cable is removed when the charge inside the cable is not completely released, electric shock accidents are likely to occur. Therefore, waiting for the cable to discharge will take a lot of time, and using a discharge rod to discharge each cable after the inspection is completed will increase the test cost and take up space.

[0004] Therefore, a cable withstand voltage test auxiliary device is proposed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a cable withstand voltage test auxiliary device in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: a cable withstand voltage test auxiliary device, comprising a mounting frame and a plurality of vertical rods fixedly connected to the upper side wall of the mounting frame, wherein the plurality of vertical rods are evenly distributed on the left and right sides of the upper side wall of the mounting frame, a clamping assembly is fixedly connected to the upper end of the vertical rod, and the same cable to be tested is placed between two clamping assemblies located in the same horizontal direction, an operating table is fixedly connected to the upper side wall of the mounting frame, a PLC controller, a humidity sensor and a temperature sensor are fixedly connected to the lower side wall of the mounting frame, and further comprising:

[0007] A first linear motor, wherein the moving end of the first linear motor is fixedly connected to a moving plate, the upper side wall of the moving plate is fixedly connected to a connecting plate, the upper side wall of the connecting plate is fixedly connected to a mounting ring, and a first electric push rod is placed in the mounting ring, the moving end of the first electric push rod is fixedly connected to a right contact head through a pressure sensor, the upper side wall of the moving plate is fixedly connected to an AC withstand voltage test device, the AC withstand voltage test device is electrically connected to the right contact head, and the right end of the cable to be tested is electrically connected to a left contact head;

[0008] The discharge seat is electrically connected to the left end of the cable to be tested, the upper side wall of the mounting frame is fixedly connected to the second linear motor and the third linear motor, and the moving ends of the second linear motor and the third linear motor are both connected to the discharge assembly;

[0009] The grounding component is fixedly connected to the inner wall of the mounting frame, and the grounding component is electrically connected to the discharge component, so that the residual charge inside the cable to be tested can be transported to the ground.

[0010] Preferably, the clamping assembly includes a clamping head and two small electric push rods, the clamping head is fixedly connected to the upper end of the vertical rod, the clamping head is a U-shaped structure, the inner wall of the clamping head is an arc structure, the two small electric push rods are respectively connected to the front and rear side walls of the clamping head, the moving end of the small electric push rod passes through the clamping head and is fixedly connected to the clamping plate through a pressure sensor.

[0011] Preferably, the discharge component includes a supporting plate and a second electric push rod, the two supporting plates are fixedly connected to the moving ends of the second linear motor and the third linear motor respectively, the supporting plate located at the moving end of the second linear motor is in a vertical state, and the supporting plate located at the moving end of the third linear motor is in a horizontal state, the second electric push rod and the supporting plate are fixedly connected, the moving end of the second electric push rod is fixedly connected to a discharge head through a pressure sensor, the side wall of the discharge head is fixedly connected to a discharge wire, the discharge wire is electrically connected to a grounding component, the side wall of the supporting plate is fixedly connected to a detection electric push rod, the moving end of the detection electric push rod is fixedly connected to a tester, and the tester is electrically connected to a PLC controller.

[0012] Preferably, the grounding component includes a placement plate, the placement plate is fixedly connected to the inner wall of the mounting frame, the side wall of the placement plate is fixedly connected to a conductive frame with an inverted T-shaped structure, the conductive frame is electrically connected to two discharge wires, the side wall of the placement plate is fixedly connected to two third electric push rods, the moving end of the third electric push rods is fixedly connected to a control motor, the moving end of the control motor is fixedly connected to a grounding head, the outer wall of the grounding head is fixedly sleeved with a conductive ring, and the conductive ring will contact the conductive frame during the downward movement.

[0013] Preferably, two medicine liquid tanks are fixedly connected to the upper side wall of the placement plate, rust remover is stored in the medicine liquid tanks, a peristaltic pump is fixedly connected to the side wall of the medicine liquid tank, the feed end of the peristaltic pump is connected to the medicine liquid tank, the discharge end of the peristaltic pump is fixedly connected to a metal pipe, the lower end of the metal pipe passes through the placement plate and is fixedly connected to a rust removal ring, the rust removal ring is a hollow structure, the metal pipe is connected to the rust removal ring, the inner wall of the rust removal ring is connected to a plurality of nozzles, and the inner wall of the rust removal ring is fixedly connected to metal bristles.

[0014] Preferably, a plurality of detection linear motors are fixedly connected to the upper side wall of the mounting frame, a movable end of the detection linear motor is fixedly connected to a vertical frame, an upper end of the vertical frame is fixedly connected to a temperature sensing ring, the temperature sensing ring is slidably arranged outside the upper cable to be tested, a plurality of temperature sensing probes are fixedly connected to the inner wall of the temperature sensing ring, and the temperature sensing probes are electrically connected to a PLC controller.

[0015] Preferably, the upper side wall of the mounting frame is fixedly connected to a top frame, the lower inner wall of the top frame is fixedly connected to a plurality of air suction boxes, the lower side wall of the air suction box is connected to a plurality of air suction heads, two adjacent air suction boxes are fixedly connected to the same short pipe, the rear side wall of the top frame is fixedly connected to a treatment box, a treatment agent is placed in the treatment box, the rear side wall of the treatment box is fixedly connected to an air pump, the air inlet end of the air pump is connected to the treatment box, the upper side wall of the treatment box is connected to an air intake pipe, the upper end of the air intake pipe passes through the top frame and is connected to the rearmost air suction box, the side walls on the opposite side of the top frame and the mounting frame are fixedly connected to a plurality of light intensity sensors, and the light intensity sensors are electrically connected to a PLC controller.

[0016] Preferably, a laser signal generator is fixedly connected to the left side wall of the connecting plate, and a laser signal receiver and an indicator light are fixedly connected to the right side walls of the plurality of vertical rods on the right side, and the laser signal receiver and the indicator light are electrically connected to the PLC controller.

[0017] Compared with the existing technology, the advantages of a cable withstand voltage test auxiliary device are:

[0018] By arranging the mounting frame, vertical pole, cable to be tested, operating table, PLC controller, humidity sensor, temperature sensor, first linear motor, moving plate, connecting plate, mounting ring, first electric push rod, right contact head, AC withstand voltage test equipment, left contact head, discharge seat, second linear motor, third linear motor, discharge assembly and grounding assembly, after the withstand voltage test of one cable is completed by using the auxiliary device, the cable can be automatically discharged by the discharge assembly, and during the discharge time of the cable, the withstand voltage test is automatically performed on the second cable, and then the second cable is discharged by using another discharge assembly. After the withstand voltage test is continued on the third cable, the first discharge assembly has basically completed the discharge work on the first cable, so that the third cable can continue to be discharged, thereby improving the efficiency of the cable withstand voltage test, and can detect whether the internal charge of the cable is fully released, thereby improving the safety of the test.

[0019] By setting up the detection linear motor, vertical frame, temperature sensing ring and temperature sensing probe, when the cable is about to break through the insulation layer due to quality problems, this situation can be detected and the current transmitted to the cable can be disconnected, thereby reducing the breakdown of the cable insulation layer and the generation of harmful gases as much as possible.

[0020] Through the top frame, suction box, suction head, short pipe, processing box, air pump and air intake pipe, when the insulation layer of the cable is broken down due to excessive voltage, the harmful gas produced by the burning of the insulation layer due to the breakdown can be automatically absorbed in time to prevent the harmful gas from being inhaled into the body of the operator, which will affect the operator's health.

[0021] By using the liquid medicine tank, peristaltic pump, metal pipe, rust removal ring, nozzle and metal brush, when the grounding head is rusted due to long-term use and the conductive performance of the grounding head is affected, the surface of the grounding head can be automatically derusted to ensure the conductive performance of the grounding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a cable withstand voltage test auxiliary device provided by the present invention;

[0023] Figure 2 The present invention provides a cable withstand voltage test auxiliary device Figure 1 A magnified schematic diagram of part A;

[0024] Figure 3 The present invention provides a cable withstand voltage test auxiliary device Figure 1 A magnified schematic diagram of part B;

[0025] Figure 4 It is a structural schematic diagram of a discharge component in a cable withstand voltage test auxiliary device provided by the present invention;

[0026] Figure 5 It is a structural schematic diagram of a clamping assembly in a cable withstand voltage test auxiliary device provided by the present invention;

[0027] Figure 6 It is a three-dimensional structural schematic diagram of a temperature sensing ring in a cable withstand voltage test auxiliary device provided by the present invention;

[0028] Figure 7 The present invention is a schematic diagram of the surface structure of a top frame in a cable withstand voltage test auxiliary device provided by the present invention.

[0029] In the figure: 1 mounting frame, 2 vertical rod, 3 cable to be tested, 4 operating table, 5 PLC controller, 6 humidity sensor, 7 temperature sensor, 8 first linear motor, 9 moving plate, 10 connecting plate, 11 mounting ring, 12 first electric push rod, 13 right contact head, 14 AC withstand voltage test equipment, 15 left contact head, 16 discharge seat, 17 second linear motor, 18 third linear motor, 19 clamping assembly, 191 clamping head, 192 small electric push rod, 20 pressure sensor, 21 clamping plate, 22 discharge assembly, 221 bearing plate, 222 second electric push rod, 23 discharge head, 24 discharge wire , 25 detection electric push rod, 26 electrometer, 27 grounding assembly, 271 placement plate, 272 conduction frame, 28 the third electric push rod, 29 control motor, 30 grounding head, 31 conduction ring, 32 liquid tank, 33 peristaltic pump, 34 metal pipe, 35 rust removal ring, 36 nozzle, 37 metal bristles, 38 detection linear motor, 39 vertical frame, 40 temperature sensing ring, 41 temperature sensing probe, 42 top frame, 43 suction box, 44 suction head, 45 short pipe, 46 processing box, 47 air pump, 48 intake pipe, 49 light intensity sensor, 50 laser signal generator, 51 laser signal receiver, 52 indicator light. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1-Figure 7As shown, a cable withstand voltage test auxiliary device includes a mounting frame 1 and a plurality of vertical rods 2 fixedly connected to the upper side wall of the mounting frame 1, the plurality of vertical rods 2 are evenly distributed on the left and right sides of the upper side wall of the mounting frame 1, the upper ends of the vertical rods 2 are fixedly connected with a clamping assembly 19, and the same cable 3 to be tested is placed between two clamping assemblies 19 located in the same horizontal direction, the clamping assembly 19 includes a clamping head 191 and two small electric push rods 192, the clamping head 191 is fixedly connected to the upper ends of the vertical rods 2, and the clamping head 191 It is a U-shaped structure, the inner wall of the clamping head 191 is an arc structure, two small electric push rods 192 are respectively connected to the front and rear side walls of the clamping head 191, the moving end of the small electric push rod 192 passes through the clamping head 191, and is fixedly connected to the clamping plate 21 through the pressure sensor 20, which can clamp the cable 3 to be tested, the upper side wall of the mounting frame 1 is fixedly connected to the operating table 4, the lower side wall of the mounting frame 1 is fixedly connected to the PLC controller 5, the humidity sensor 6 and the temperature sensor 7, and also includes:

[0032] A first linear motor 8, a moving end of the first linear motor 8 is fixedly connected to a moving plate 9, an upper side wall of the moving plate 9 is fixedly connected to a connecting plate 10, an upper side wall of the connecting plate 10 is fixedly connected to a mounting ring 11, and a first electric push rod 12 is placed in the mounting ring 11, a moving end of the first electric push rod 12 is fixedly connected to a right contact head 13 through a pressure sensor 20, an upper side wall of the moving plate 9 is fixedly connected to an AC withstand voltage test device 14, the AC withstand voltage test device 14 and the right contact head 13 are electrically connected, and the right end of the cable 3 to be tested is electrically connected to a left contact head 15;

[0033] The discharge seat 16 is electrically connected to the left end of the cable 3 to be tested. The upper side wall of the mounting frame 1 is fixedly connected to the second linear motor 17 and the third linear motor 18. The moving ends of the second linear motor 17 and the third linear motor 18 are both connected to the discharge assembly 22. The discharge assembly 22 includes a bearing plate 221 and a second electric push rod 222. The two bearing plates 221 are respectively fixedly connected to the moving ends of the second linear motor 17 and the third linear motor 18. The bearing plate 221 at the moving end of the second linear motor 17 is in a vertical state, and the bearing plate 221 at the moving end of the third linear motor 18 is in a vertical state. The carrier plate 221 is in a horizontal state, the second electric push rod 222 is fixedly connected to the carrier plate 221, the moving end of the second electric push rod 222 is fixedly connected to the discharge head 23 through the pressure sensor 20, the side wall of the discharge head 23 is fixedly connected to the discharge wire 24, the discharge wire 24 is electrically connected to the grounding component 27, the side wall of the carrier plate 221 is fixedly connected to the detection electric push rod 25, the moving end of the detection electric push rod 25 is fixedly connected to the electroscope 26, the electroscope 26 is electrically connected to the PLC controller 5, and can release the residual charge inside the cable 3 to be tested;

[0034] The grounding component 27 is fixedly connected to the inner wall of the mounting frame 1, and the grounding component 27 is electrically connected to the discharge component 22, and can transfer the residual charge inside the cable 3 to be tested to the ground. The grounding component 27 includes a placement plate 271, and the placement plate 271 is fixedly connected to the inner wall of the mounting frame 1. The side wall of the placement plate 271 is fixedly connected with a conductive frame 272 with an inverted T-shaped structure, and the conductive frame 272 is electrically connected to two discharge wires 24. The side wall of the placement plate 271 is fixedly connected with two third electric push rods 28, and the moving end of the third electric push rod 28 is fixedly connected with a control motor 29, and the moving end of the control motor 29 is fixedly connected with a grounding head 30. The outer wall of the grounding head 30 is fixedly sleeved with a conductive ring 31, and the conductive ring 31 will contact the conductive frame 272 during the downward movement, and can conduct the charge to the ground.

[0035] Two liquid medicine boxes 32 are fixedly connected to the upper side wall of the placement plate 271, and rust remover is stored in the liquid medicine boxes 32. A peristaltic pump 33 is fixedly connected to the side wall of the liquid medicine box 32. The feed end of the peristaltic pump 33 is connected to the liquid medicine box 32, and the discharge end of the peristaltic pump 33 is fixedly connected to a metal pipe 34. The lower end of the metal pipe 34 passes through the placement plate 271 and is fixedly connected to a rust removal ring 35. The rust removal ring 35 is a hollow structure. The metal pipe 34 is connected to the rust removal ring 35. The inner wall of the rust removal ring 35 is connected to multiple nozzles 36. The inner wall of the rust removal ring 35 is fixedly connected to metal bristles 37. When the grounding head 30 rusts due to long-term use and affects the conductive performance of the grounding head 30, the surface of the grounding head 30 can be automatically derusted to ensure the conductive performance of the grounding head 30.

[0036] The upper side wall of the mounting frame 1 is fixedly connected with a plurality of detection linear motors 38, the movable end of the detection linear motor 38 is fixedly connected with a vertical frame 39, the upper end of the vertical frame 39 is fixedly connected with a temperature sensing ring 40, the temperature sensing ring 40 is slidably arranged outside the upper cable 3 to be tested, the inner wall of the temperature sensing ring 40 is fixedly connected with a plurality of temperature sensing probes 41, the temperature sensing probes 41 and the PLC controller 5 are electrically connected, so that when the insulation layer of the cable 3 to be tested is about to be broken down due to quality problems, this situation can be detected as much as possible, and the current transmitted to the cable 3 to be tested can be disconnected, so as to reduce the insulation layer breakdown of the cable 3 to be tested and the generation of harmful gases as much as possible.

[0037] The upper side wall of the mounting frame 1 is fixedly connected to a top frame 42, the lower inner wall of the top frame 42 is fixedly connected to a plurality of suction boxes 43, the lower side wall of the suction box 43 is connected to a plurality of suction heads 44, two adjacent suction boxes 43 are fixedly connected to the same short pipe 45, the rear side wall of the top frame 42 is fixedly connected to a treatment box 46, a treatment agent is placed in the treatment box 46, the rear side wall of the treatment box 46 is fixedly connected to an air pump 47, the air inlet end of the air pump 47 is connected to the treatment box 46, and the upper side wall of the treatment box 46 is connected to an air inlet pipe 48. The upper end of the air inlet pipe 48 passes through the top frame 42 and is connected to the air suction box 43 on the rear side. The side walls on the opposite side of the top frame 42 and the mounting frame 1 are fixedly connected with multiple light intensity sensors 49. The light intensity sensor 49 is electrically connected to the PLC controller 5. When the insulation layer of the cable 3 to be tested is broken down due to excessive voltage, the harmful gases generated by the burning of the insulation layer due to the breakdown can be automatically absorbed in time to prevent the harmful gases from being inhaled into the body of the operator, which would affect the operator's health.

[0038] A laser signal generator 50 is fixedly connected to the left side wall of the connecting plate 10, and a laser signal receiver 51 and an indicator light 52 are fixedly connected to the right side walls of multiple vertical rods 2 on the right side. The laser signal receiver 51 and the indicator light 52 are both electrically connected to the PLC controller 5, so that the right contact head 13 can be aligned with the left contact head 15.

[0039] The operating principle of the present invention is now explained as follows: before the withstand voltage test is performed on the cable 3 to be tested, the left contact head 15 is first connected to the conductor at the right end of the cable 3 to be tested. The function of the left contact head 15 is to fix the two phases (such as phase A and phase C, assuming that phase B is tested this time) in the three-phase cable that do not need to be subjected to the withstand voltage test, and separate them from the phase (phase B) that needs to be tested. The purpose of this is to be able to apply voltage to the phase that needs to be tested separately for the withstand voltage test during the subsequent test process, and not allow the voltage to be applied to the phase that does not need to be tested, so as to avoid unnecessary influence or damage to the part that does not need to be tested; when the left contact head 15 is connected to the cable 3 to be tested, when the right contact head 13 is subsequently in contact with the left contact head 15, the two phases (phase A and phase C) that are not to be tested and have been fixed by the left contact head 15 will be grounded through the right contact head 13, and the left contact head 1 5 and the right contact head 13 have multiple tapping points on their surfaces. The function of these tapping points is to ensure that the two phases not to be tested can have good electrical connection with the grounding loop, so as to achieve reliable grounding. In this way, during the withstand voltage test, the induced charges that may be generated on the two phases not to be tested can be timely introduced into the earth through the grounding loop to ensure the safety and accuracy of the test. At the same time, it also avoids the situation where the two phases not to be tested have abnormal voltages that affect the test results or cause damage to the equipment. The discharge seat 16 is connected to the conductor at the left end of the cable 3 to be tested, and then the multiple cables 3 to be tested are placed in multiple clamping heads 191 respectively. The same cable 3 to be tested is placed in two clamping heads 191 located on the same straight line. When placing the cable 3 to be tested, the operator needs to manually adjust the position of the cable 3 to be tested. The discharge seat 16 is located on the moving path of the discharge head 23 above the third linear motor 18;

[0040] Next, the operator transmits an electrical signal to the PLC controller 5 through the operating table 4. After receiving the electrical signal, the PLC controller 5 first controls the laser signal generator 50 to work, and at the same time controls the first linear motor 8 to work. The first linear motor 8 drives the laser signal generator 50 to move from back to front through the connecting plate 10. The laser signal generator 50 and the laser signal receiver 51 are on the same plane. When the laser signal generator 50 is moving forward, the laser signal emitted by the laser signal generator 50 will be received by the laser signal receiver 51. When the laser signal receiver 51 receives the laser signal, it will immediately control the first linear motor 8 to stop working through the PLC controller 5. The first electric push rod 12 is operated, and then the PLC controller 5 controls the first electric push rod 12 to work. After the first electric push rod 12 drives the right contact head 13 to contact the left contact head 15 through the pressure sensor 20, it will be sensed by the pressure sensor 20, and the pressure sensor 20 will control the first electric push rod 12 to stop working through the PLC controller 5, and then the PLC controller 5 will control the AC withstand voltage test device to work until the set time (the AC withstand voltage test device 14 is composed of a variable frequency power supply, an excitation transformer, a reactor and a capacitive voltage divider, and the method of connecting two reactors in series in the prior art is changed to a method of connecting two reactors in series into two groups and then connecting the two groups of reactors in parallel. First, the reactor is divided into two groups in series, and the equivalent reactance of each group is set to X 等效 For each group of series reactors, there are X 等效 =X1+X2, then connect these two groups of equivalent reactance in parallel, according to the calculation formula of parallel reactance X 总 =X 等效 *X 等效 / X 等效 +X 等效 =X 等效 / 2, due to the decrease of total reactance, when the voltage U remains unchanged, according to I=U / X, the current I in the circuit increases at this time. For the generator, its output power P=UI. When the voltage U remains unchanged, the current I increases, so the power that the generator can output increases, and a generator with a larger power can be used to meet the power supply demand of the test device. The working mode and principle of the AC withstand voltage test equipment 14 are existing mature technologies and are not repeated in this article). During the operation of the AC withstand voltage test device, the PLC controller 5 will control the corresponding detection linear motor 38 to work, and the detection linear motor 38 drives the temperature sensing ring 40 to move back and forth through the vertical frame 39, and detects the temperature of the surface of the cable 3 to be tested at this location through the temperature sensing probe 41 inside the temperature sensing ring 40 (during the withstand voltage test, if there is a weak area in the insulation layer, it may cause the leakage current to increase. According to Joule's law Q=I 2RT, where Q is heat, I is current, R is resistance, and T is time. When leakage current passes through a weak insulation area with a certain resistance, heat will be generated. If the leakage current persists and is large, the heat generated will make the temperature of the area abnormal. When the temperature exceeds the set threshold, the insulation layer of the cable to be tested 3 will be broken down. For example, for a cable with a rated current of 300A, if the actual operating current reaches 350A, the temperature of the insulation layer may have risen to 60-70℃. Assuming that the temperature is 50-60℃ under normal rated current, when breakdown occurs, the temperature may instantly rise to 200-300℃). When the temperature sensor 41 detects that the temperature of the surface of the insulation layer of the cable to be tested 3 exceeds the set threshold, the temperature sensor 41 will send a signal to the PLC control. The device 5 transmits an electrical signal, and the PLC controller 5 will immediately control the AC withstand voltage test equipment 14 to stop working, and control the first electric push rod 12 to drive the right contact head 13 to move rightward to the initial position, and then the PLC controller 5 controls the first linear motor 8 to drive the right contact head 13 to continue to move forward, and test the cable 3 to be tested in front (when the first cable 3 to be tested is detected to be OK, after the AC withstand voltage test equipment 14 works for the set time, the PLC controller 5 will also control the first linear motor 8 to drive the right contact head 13 to move forward, and test the cable 3 to be tested in front), and then the PLC controller 5 will control the corresponding indicator light 52 to work, indicating that the insulation layer of the cable 3 to be tested will be broken during the withstand voltage test, which does not meet the design standards;

[0041] After the first linear motor 8 drives the right contact head 13 to move forward, the PLC controller 5 will also control the second linear motor 17 to move forward to a set distance, and then the PLC controller 5 controls the second electric push rod 222 above the second linear motor 17 to work, so that the second electric push rod 222 drives the discharge head 23 to be tested to move rightward, so that the discharge head 23 contacts the discharge seat 16 at the left end of the first cable 3 to be tested. When the pressure sensor 20 between the second electric push rod 222 and the discharge head 23 detects that the discharge head 23 contacts the discharge seat 16, the pressure sensor 20 will control the second electric push rod 222 to stop working, and the remaining charge inside the first cable 3 to be tested will be transported to the grounding head 30 on the left side through the discharge head 23, the discharge wire 24, the conductive frame 272 and the conductive ring 31 (the contact head on the left side is inserted into the ground in the initial state). And it is released to the ground through the grounding head 30 on the left. Referring to the above principle, when the AC withstand voltage test equipment 14 finishes the test on the second cable 3 to be tested, the PLC controller 5 will control the discharge head 23 above the third linear motor 18 to contact the discharge seat 16 at the left end of the second cable 3 to be tested, and the second cable 3 to be tested is discharged. After the discharge work at the first cable 3 to be tested reaches the set time, the PLC controller 5 will control the detection electric push rod 25 to drive the tester 26 to work once every half a minute. When the tester 26 detects that the charge inside the first cable is released (the tester 26 is an existing mature equipment and will not be repeated in the text), after the withstand voltage test on the third cable 3 to be tested is completed, the PLC controller 5 will control the discharge head 23 above the second linear motor 17 to discharge the third cable 3 to be tested.

[0042] When the tester 26 detects that there is still residual charge in the cable 3 to be tested within the set time, and the set time exceeds the expected time by one minute (for example, the residual charge in the cable 3 to be tested will be released within the expected time of ten minutes, but the tester 26 still detects that there is charge in the cable 3 to be tested after eleven minutes), and at the same time, the humidity sensor 6 and the temperature sensor 7 detect that the external environment is in a normal state, and other external detection devices detect that the soil contact is good and the circuit is normal, it means that the left grounding head 30 is rusted (when the grounding head 30 is rusted, a rust layer will be formed on the electrode surface, and the rust layer is usually It is composed of metal oxides, and the conductivity of these oxides is much lower than that of the metal itself) so that the resistance of the grounding head 30 increases and the conductivity becomes worse. After the PLC controller 5 detects this situation, the PLC controller 5 will control the third electric push rod 28 and the control motor 29 on the right to work simultaneously. The third electric push rod 28 mobilizes the grounding head 30 on the right to be inserted into the soil through the control motor 29 (the output end of the control motor 29 is connected to the grounding head 30 through an insulating component). Then the PLC controller 5 controls the third electric push rod 28 and the control motor 29 on the left to work simultaneously to pull the grounding head 30 on the left out of the ground. In the process, the soil on the surface of the left grounding head 30 will be cleaned by the metal bristles 37, and then the PLC controller 5 controls the third electric push rod 28 to drive the left grounding head 30 to move up and down several times with a small amplitude. At the same time, the PLC controller 5 controls the peristaltic pump 33 on the left to work until the set time. The peristaltic pump 33 on the left transports the rust remover in the left liquid tank 32 to the rust removal ring 35 through the metal pipe 34, and sprays it through the nozzle 36, so that the rust remover is evenly sprayed on the surface of the left grounding head 30. After the rust remover reacts with the rust on the surface of the grounding head 30 for a period of time, the PLC controller 5 will control the control motor 29 and The third electric push rod 28 works, and the rusted part is cleaned with the metal bristles 37 (because the conductive ring 31 and the conductive frame 272 on the surface of the left grounding head 30 are separated at this time, the left grounding head 30 will not be charged, avoiding the safety hazard caused by the grounding head 30 working with power, and the output end of the control motor 29 is connected to the grounding head 30 through the insulating column to avoid residual charge causing problems in the internal circuit of the control motor 29, and the inner wall of the rust removal ring 35 is connected to the metal bristles 37 through the insulating layer to avoid residual charge flowing into the rust removal ring 35 through the metal bristles 37, so that the rust removal ring 35 is charged, which poses a greater safety hazard);

[0043] When the cable 3 to be tested breaks down during the test (since the temperature-sensitive ring 40 slides left and right on the surface of the cable 3 to be tested, the location of the breakdown on the surface of the cable 3 to be tested may not be detected in time by the temperature-sensitive ring 40), electric sparks will appear after the insulation layer of the cable 3 to be tested breaks down, and this situation can be detected by the multiple light intensity sensors 49 that are set. When the light intensity sensor 49 detects this situation, the light intensity sensor 49 will control the air pump 47 to work for a set time. The processing box 46 is filled with activated carbon, and the air pump 47 extracts the gas inside the processing box 46 to reduce the air pressure inside the processing box 46. The harmful gas generated when the insulation layer breaks down will enter the suction box 43 through the suction head 44 along the air flow under the action of atmospheric pressure, and the harmful gas will be transported to the processing box 46 through the short tube 45 and the air inlet pipe 48. The activated carbon in the processing box 46 is used to absorb the harmful substances in the gas to avoid the harmful gas being inhaled into the body of the operator and causing damage to the operator's body.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable withstand voltage test auxiliary device, comprising a mounting frame (1) and a plurality of vertical rods (2) fixedly connected to the upper side wall of the mounting frame (1), wherein the plurality of vertical rods (2) are evenly distributed on the left and right sides of the upper side wall of the mounting frame (1), the upper ends of the vertical rods (2) are fixedly connected to a clamping assembly (19), and a same cable to be tested (3) is placed between two clamping assemblies (19) located in the same horizontal direction, the upper side wall of the mounting frame (1) is fixedly connected to an operating table (4), and the lower side wall of the mounting frame (1) is fixedly connected to a PLC controller (5), a humidity sensor (6) and a temperature sensor (7), wherein: Also includes: A first linear motor (8), wherein the moving end of the first linear motor (8) is fixedly connected to a moving plate (9), the upper side wall of the moving plate (9) is fixedly connected to a connecting plate (10), the upper side wall of the connecting plate (10) is fixedly connected to a mounting ring (11), and a first electric push rod (12) is placed in the mounting ring (11), the moving end of the first electric push rod (12) is fixedly connected to a right contact head (13) via a pressure sensor (20), the upper side wall of the moving plate (9) is fixedly connected to an AC withstand voltage test device (14), the AC withstand voltage test device (14) and the right contact head (13) are electrically connected, and the right end of the cable to be tested (3) is electrically connected to a left contact head (15); The discharge seat (16) is electrically connected to the left end of the cable to be tested (3); the upper side wall of the mounting frame (1) is fixedly connected to a second linear motor (17) and a third linear motor (18); the movable ends of the second linear motor (17) and the third linear motor (18) are both connected to a discharge assembly (22); A grounding component (27) is fixedly connected to the inner wall of the mounting frame (1); the grounding component (27) is electrically connected to the discharge component (22) and can transport the residual charge inside the cable (3) to the ground; the discharge component (22) comprises a bearing plate (221) and a second electric push rod (222); the two bearing plates (221) are respectively fixedly connected to the moving ends of the second linear motor (17) and the third linear motor (18); the bearing plate (221) located at the moving end of the second linear motor (17) is in a vertical state, and the bearing plate (221) located at the moving end of the third linear motor (18) is in a water-tight state. In a flat state, the second electric push rod (222) is fixedly connected to the supporting plate (221), the movable end of the second electric push rod (222) is fixedly connected to a discharge head (23) via a pressure sensor (20), the side wall of the discharge head (23) is fixedly connected to a discharge wire (24), the discharge wire (24) and a grounding component (27) are electrically connected, the side wall of the supporting plate (221) is fixedly connected to a detection electric push rod (25), the movable end of the detection electric push rod (25) is fixedly connected to an electroscope (26), and the electroscope (26) and a PLC controller (5) are electrically connected.

2. A cable withstand voltage test auxiliary device according to claim 1, characterized in that: The clamping assembly (19) comprises a clamping head (191) and two small electric push rods (192); the clamping head (191) is fixedly connected to the upper end of the vertical rod (2); the clamping head (191) is a U-shaped structure; the inner wall of the clamping head (191) is an arc structure; the two small electric push rods (192) are respectively connected to the front and rear side walls of the clamping head (191); the moving end of the small electric push rod (192) passes through the clamping head (191) and is fixedly connected to the clamping plate (21) via a pressure sensor (20).

3. A cable withstand voltage test auxiliary device according to claim 1, characterized in that: The grounding assembly (27) comprises a placement plate (271), the placement plate (271) is fixedly connected to the inner wall of the mounting frame (1), the side wall of the placement plate (271) is fixedly connected to a conductive frame (272) of an inverted T-shaped structure, the conductive frame (272) is electrically connected to two discharge wires (24), the side wall of the placement plate (271) is fixedly connected to two third electric push rods (28), the moving end of the third electric push rod (28) is fixedly connected to a control motor (29), the moving end of the control motor (29) is fixedly connected to a grounding head (30), the outer wall of the grounding head (30) is fixedly sleeved with a conductive ring (31), and the conductive ring (31) contacts the conductive frame (272) during the downward movement.

4. A cable withstand voltage test auxiliary device according to claim 3, characterized in that: The upper side wall of the placement plate (271) is fixedly connected to two liquid medicine boxes (32), wherein rust remover is stored in the liquid medicine boxes (32), and the side wall of the liquid medicine box (32) is fixedly connected to a peristaltic pump (33), the feed end of the peristaltic pump (33) is connected to the liquid medicine box (32), and the discharge end of the peristaltic pump (33) is fixedly connected to a metal pipe (34), the lower end of the metal pipe (34) passes through the placement plate (271) and is fixedly connected to a rust removal ring (35), the rust removal ring (35) is a hollow structure, the metal pipe (34) is connected to the rust removal ring (35), the inner wall of the rust removal ring (35) is connected to a plurality of nozzles (36), and the inner wall of the rust removal ring (35) is fixedly connected to metal bristles (37).

5. A cable withstand voltage test auxiliary device according to claim 1, characterized in that: The upper side wall of the mounting frame (1) is fixedly connected to a plurality of detection linear motors (38); the movable end of the detection linear motor (38) is fixedly connected to a vertical frame (39); the upper end of the vertical frame (39) is fixedly connected to a temperature sensing ring (40); the temperature sensing ring (40) is slidably arranged outside the upper cable (3) to be tested; the inner wall of the temperature sensing ring (40) is fixedly connected to a plurality of temperature sensing probes (41); the temperature sensing probes (41) are electrically connected to a PLC controller (5).

6. A cable withstand voltage test auxiliary device according to claim 1, characterized in that: The upper side wall of the mounting frame (1) is fixedly connected to a top frame (42), the lower inner wall of the top frame (42) is fixedly connected to a plurality of suction boxes (43), the lower side wall of the suction box (43) is connected to a plurality of suction heads (44), two adjacent suction boxes (43) are fixedly connected to the same short pipe (45), the rear side wall of the top frame (42) is fixedly connected to a treatment box (46), a treatment agent is placed in the treatment box (46), and the rear side wall of the treatment box (46) is fixedly connected to the bottom wall of the suction box (43). An air pump (47) is fixedly connected, the air inlet end of the air pump (47) is connected to the processing box (46), the upper side wall of the processing box (46) is connected to an air inlet pipe (48), the upper end of the air inlet pipe (48) passes through the top frame (42) and is connected to the rearmost suction box (43), and the side wall on the opposite side of the top frame (42) and the mounting frame (1) is fixedly connected with a plurality of light intensity sensors (49), and the light intensity sensors (49) are electrically connected to the PLC controller (5).

7. A cable withstand voltage test auxiliary device according to claim 1, characterized in that: A laser signal generator (50) is fixedly connected to the left side wall of the connecting plate (10), and a laser signal receiver (51) and an indicator light (52) are fixedly connected to the right side walls of the plurality of vertical rods (2) on the right side, and the laser signal receiver (51) and the indicator light (52) are both electrically connected to the PLC controller (5).

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