A high voltage cable termination protection device

Abstract

The utility model relates to cable equipment technical field, concretely relates to a high -voltage cable terminal protection device, including casing, control unit and warning device, the plug connector and plug seat that install in the cable end and be located in the casing inside are installed on the movable seat respectively, two movable seats are slidably installed on the horizontal lifting frame, the horizontal plug pin is established on the movable seat, the plug pin is respectively inserted in the spacing hole that sets up in the casing, the spacing between two spacing holes gradually expands downward, the technical scheme is driven the plug connector and the plug seat separation through the lowering of lifting frame, the lowering of lifting frame can make cable self -stress release to a certain extent, prepare for the separation action in the expansion section subsequently, provide a pre -relaxation stage for cable in the process of separating cable, guarantee the smooth of cable separation.

Description

Technical Field

[0001] This utility model relates to the field of cable equipment technology, and specifically to a high-voltage cable terminal protection device. Background Technology

[0002] High-voltage cables are a type of power cable, referring to power cables used to transmit power between 1kV and 1000kV. They are widely used in power transmission and distribution, serving as a bridge between power supply equipment and power consumption equipment, and playing a role in transmitting electrical energy. Due to their wide application, faults frequently occur. Cable breakage is caused by cable compression due to thermal expansion. When cross-linked cables are under high load, the core temperature rises, causing the cable to expand. At bends in tunnels, the cable presses against the support structure. Long-term operation under high load results in significant cable creep force, causing the support structure to crush the cable's outer sheath and metal sheath, squeezing into the cable insulation layer and leading to cable breakdown. This results in poor safety performance. When a fault occurs at the cable terminal, it often causes substantial losses, as the cable cannot be disconnected in time, and the location of the fault is difficult to determine, causing inconvenience for subsequent maintenance. Chinese patent CN109148233B discloses an interlocking protection device for an intelligent high-voltage cable terminal, comprising an upper tube and a lower tube. The upper end of the upper tube has a sealing tube on its inner side. A first cable and a second cable are respectively installed on the upper and lower tubes. A temperature sensor can detect the temperature of the cable terminal, automatically separating and cutting the first and second cables to prevent cable puncture and significant losses. However, the cable is under tension after installation. With the terminal protection device fixed in position, directly stretching and separating the cable along its length is difficult, leading to a slower cable disconnection speed. Utility Model Content

[0003] To address the aforementioned technical deficiencies, the purpose of this utility model is to provide a high-voltage cable terminal protection device, comprising a housing, and a connector and a socket installed at the cable end and located inside the housing. The connector and socket are inserted and connected within the housing, and are respectively mounted on movable seats. The two movable seats are slidably mounted on a horizontal lifting frame, which is slidably mounted within the housing and moves vertically. Horizontal insertion shafts are provided on the movable seats, and the insertion shafts are respectively inserted into limiting holes provided on the housing. The distance between the two limiting holes gradually increases downwards. When the movable seat is at the top of the limiting holes, the connector and socket are inserted and connected. When the lifting frame moves downwards, the insertion shafts move in the limiting holes, causing the connector and socket to separate. The housing is provided with a control unit for controlling the lifting and lowering of the lifting frame, and an alarm device for warning after the connector and socket separate.

[0004] To allow the cable to be released before separating the connector from the socket, the following features are specifically provided: the limiting hole includes a vertical section and an expansion section connecting the bottom end of the vertical section, the width of the vertical section and the expansion section being the same as the diameter of the insert shaft.

[0005] To accommodate the vertical movement of cables caused by the lifting of the lifting frame, the following features are specifically designed: vertically extending clearance openings are provided at both ends of the housing.

[0006] To ensure that the movable seat can only move horizontally to separate the connector and the insertion seat when the lifting frame moves downward, and to prevent rotation around the insertion shaft, the following features are specifically provided: the lifting frame is provided with a waist-shaped hole that extends horizontally perpendicular to the insertion shaft axis, and a vertical limiting bolt is installed on the top of the movable seat. The diameter of the limiting bolt is the same as the width of the waist-shaped hole, and the limiting bolt is inserted into the waist-shaped hole to limit its movement.

[0007] To achieve rapid separation of the lifting frame in case of cable failure and facilitate subsequent reset, the following features are specifically designed: The bottom of the lifting frame is provided with several vertical guide rods, which are inserted into guide holes at the bottom of the housing. A first spring is sleeved on the guide rod, elastically connecting the bottom of the lifting frame and the bottom of the housing, causing the lifting frame to tend to move downwards. The top of the lifting frame is provided with a vertically extending pull rod to the outside of the housing. A first positioning hole is provided on the side of the lifting frame that fits against the housing, and a second positioning hole is provided on the housing. When the lifting frame moves upwards until the insertion shaft is at the top of the limiting hole, the second positioning hole and the first positioning hole are on the same straight line. A locking rod coaxially installed in the second positioning hole is inserted into the first positioning hole to lock the height position of the lifting frame.

[0008] Preferably, the locking rod is mounted on a connecting piece located outside the housing. A sealing cover is installed on the side of the housing with the second positioning hole, and the sealing cover seals the second positioning hole and the limiting hole. A sliding rod parallel to the axis of the second positioning hole is provided inside the sealing cover. The connecting piece is slidably mounted on the sliding rod, and a second spring is sleeved on the sliding rod. The second spring elastically connects the connecting piece and the inner wall of the sealing cover. The elastic force of the second spring causes the connecting piece to tend to move away from the housing. An inclined block is provided at the top of the connecting piece, and a linear actuator is installed inside the sealing cover. The working end of the linear actuator is located above the inclined block and is set to move in the vertical direction. When the working end of the linear actuator presses down on the inclined block, the connecting piece stretches the second spring, causing the locking rod to be inserted into the second positioning hole and the first positioning hole.

[0009] To achieve the purpose of automatically activating the alarm when the control unit detects a fault, the following features are specifically provided: the alarm includes a mounting box installed at the bottom of the housing, an alarm light installed inside the mounting box, a through hole coaxial with the guide hole on the mounting box, and a contact sensor located below the through hole inside the mounting box. The contact sensor is connected to the alarm light via a signal from the control unit.

[0010] Preferably, the control unit includes a PLC controller that signals the linear driver and the warning light, and a temperature sensor for detecting the cable temperature.

[0011] The advantages of this utility model compared to the prior art are: Firstly, this utility model allows the lifting frame to move down a certain distance through the vertical section of the limiting hole, so that the stress of the cable itself can be released to a certain extent, which prepares for the subsequent separation action in the expansion section. During the separation of the cable, a pre-relaxation stage is provided for the cable to ensure smooth cable separation.

[0012] Secondly, in the event of a malfunction, this utility model only requires the linear actuator to release the pressure on the inclined block, and the second spring can quickly pull the locking rod to exit. The first spring instantly releases its elastic force to push the lifting frame down, which greatly shortens the response time of the lifting frame from locking to moving down, thereby accelerating the separation speed of the connector and the socket, and can cut off the faulty circuit more promptly.

[0013] Thirdly, the warning device in this utility model directly uses the guide rod of the lifting frame as the trigger condition for the contact sensor, and the triggering timing is accurate. Moreover, the warning light directly marks the location of the faulty terminal through visual light signals, so that the staff can quickly locate the fault point through the warning light without having to check the cables one by one or disassemble the device. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of a high-voltage cable terminal protection device.

[0016] Figure 2 This is a side view of a high-voltage cable terminal protection device.

[0017] Figure 3 A high-voltage cable terminal protection device that operates under normal conditions along... Figure 2 Sectional view at point AA.

[0018] Figure 4 A high-voltage cable terminal protection device that operates along the fault line in a fault state. Figure 2 Sectional view at point AA.

[0019] Figure 5 This is a front view of a high-voltage cable terminal protection device.

[0020] Figure 6 A high-voltage cable terminal protection device that operates along the fault line in a fault state. Figure 5Sectional view of section BB.

[0021] Figure 7 A high-voltage cable terminal protection device that operates under normal conditions along... Figure 5 Sectional view of section BB.

[0022] Figure 8 A three-dimensional structural breakdown of a high-voltage cable terminal protection device Figure 1 .

[0023] Figure 9 A three-dimensional structural breakdown of a high-voltage cable terminal protection device Figure 2 .

[0024] Explanation of reference numerals in the attached drawings: 1. Housing; 1a. Movable seat; 1a1. Insert shaft; 1a2. Limit bolt; 1b. Lifting frame; 1b1. Waist-shaped hole; 1b2. Guide rod; 1b3. First spring; 1b4. Pull rod; 1b5. First positioning hole; 1c. Limit hole; 1c1. Vertical section; 1c2. Expansion section; 1d. Guide hole; 1e. Second positioning hole; 1e1. Locking rod; 1e2. Connecting piece; 1e3. Inclined block; 1f. Sealing cover; 1f1. Slide rod; 1f2. Second spring; 1f3. Linear actuator; 2. Connector; 2a. Connector socket; 3. Control unit; 3a. PLC controller; 3b. Temperature sensor; 4. Alarm; 4a. Mounting box; 4a1. Through hole; 4a2. Contact sensor; 4b. Alarm light. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1 to 9 : A high-voltage cable terminal protection device includes a housing 1, and a connector 2 and a socket 2a installed at the cable end and located inside the housing 1. The connector 2 and the socket 2a are inserted and connected inside the housing 1. The connector 2 and the socket 2a are respectively installed on a movable seat 1a. The two movable seats 1a are slidably installed on a horizontal lifting frame 1b. The lifting frame 1b is slidably installed inside the housing 1 and moves vertically. A horizontal insertion shaft 1a1 is provided on the movable seat 1a. The insertion shaft 1a1 is inserted into a limiting hole 1c provided on the housing 1. The distance between the two limiting holes 1c gradually increases downward. When the movable seat 1a is at the top of the limiting hole 1c, the connector 2 and the socket 2a are inserted and connected. When the lifting frame 1b moves downward, the insertion shaft 1a1 moves in the limiting hole 1c, causing the connector 2 and the socket 2a to separate. The housing 1 is provided with a control unit 3 for controlling the lifting of the lifting frame 1b, and an alarm 4 for warning after the connector 2 and the socket 2a are separated.

[0027] In this embodiment, when connecting the cable, the lifting frame 1b is moved to the upper position inside the housing 1. At this time, the connector 2 of the connecting cable is inserted and connected to the connector 2a to achieve conductive connection at the end of the cable. When the control unit 3 detects that there is an abnormality at the cable end and the circuit needs to be cut off, the control unit 3 drives the lifting frame 1b to move downward. As the lifting frame 1b moves downward, the insertion shaft 1a1 on the moving seat 1a slides along the wall of the hole in the limiting hole 1c of the housing 1. As the distance between the two limiting holes 1c gradually increases downward, the insertion shaft 1a1, under the guidance of the limiting hole 1c, drives the two moving seats 1a to separate horizontally in opposite directions along the lifting frame 1b, thereby causing the inserted connector 2 to disengage from the connector 2a, thus cutting off the circuit at the end of the cable. When the connector 2 and the connector 2a are completely separated, the alarm 4 is triggered and emits an alarm signal, indicating that the terminal has been cut off and there is a fault in the circuit.

[0028] To allow the cable to be released before separating the connector 2 from the socket 2a, the following features are specifically provided: The limiting hole 1c includes a vertical section 1c1 and an expansion section 1c2 connected to the bottom end of the vertical section 1c1. The width of the vertical section 1c1 and the expansion section 1c2 is the same as the diameter of the insertion shaft 1a1.

[0029] In this embodiment, the limiting hole 1c is provided with a vertical section 1c1. During the initial downward movement of the lifting frame 1b, the insertion shaft 1a1 slides within the vertical section 1c1, and the relative positions of the plug connector 2 and the plug seat 2a remain unchanged. This process is equivalent to providing a pre-relaxation stage for the cable. Because high-voltage cables are often in a stretched state after installation, direct separation is difficult. However, by allowing the lifting frame 1b to move down a certain distance through the vertical section 1c1, the stress on the cable itself can be released to a certain extent, preparing for the subsequent separation action in the expansion section 1c2.

[0030] To accommodate the vertical movement of the cable caused by the lifting of the lifting frame 1b, the following features are specifically designed: The housing 1 has vertically extending clearance openings at both ends.

[0031] When the lifting frame 1b moves downward, the end of the cable can move accordingly at the clearance opening of the housing. The existence of the clearance opening provides space for the cable to relax and release stress.

[0032] To ensure that the moving seat 1a can only move horizontally to separate the connector 2 and the insertion seat 2a when the lifting frame 1b moves downward, and to prevent rotation around the insertion shaft 1a1, the following features are specifically designed: The lifting frame 1b is provided with a waist-shaped hole 1b1 that extends horizontally to the axis of the insertion shaft 1a1. A vertical limiting bolt 1a2 is installed on the top of the moving seat 1a. The diameter of the limiting bolt 1a2 is the same as the width of the waist-shaped hole 1b1. The limiting bolt 1a2 is inserted into the waist-shaped hole 1b1 to limit the movement.

[0033] In this embodiment, the limiting bolt 1a2 at the top of the movable seat 1a is inserted into the waist-shaped hole 1b1 of the lifting frame 1b. The limiting bolt 1a2 makes the lifting frame 1b fit against the top of the movable seat 1a, preventing the movable seat 1a from rotating and causing the insertion shaft 1a1 to rotate. This avoids misalignment, jamming, or poor contact when the connector 2 and the connector seat 2a are separated due to the rotation of the movable seat 1a, ensuring that the two are always accurately separated along the preset horizontal direction, and improving the stability of the fault cut-off action.

[0034] To enable rapid separation of the lifting frame 1b in the event of a cable failure and to facilitate subsequent reset, the following features are specifically designed: The bottom of the lifting frame 1b is provided with several vertical guide rods 1b2, which are inserted into the guide holes 1d at the bottom of the housing 1. A first spring 1b3 is sleeved on the guide rod 1b2, which elastically connects the bottom of the lifting frame 1b and the bottom of the housing 1, and causes the lifting frame 1b to have a downward tendency. The top of the lifting frame 1b is provided with a pull rod 1b4 that extends vertically to the outside of the housing 1. A first positioning hole 1b5 is provided on the side of the lifting frame 1b that is in contact with the housing 1, and a second positioning hole 1e is provided on the housing 1. When the lifting frame 1b moves up to the top of the insertion shaft 1a1, the second positioning hole 1e and the first positioning hole 1b5 are on the same straight line. A locking rod 1e1, which is coaxially installed in the second positioning hole 1e, is inserted into the first positioning hole 1b5 to lock the height position of the lifting frame 1b.

[0035] The locking rod 1e1 is mounted on the connecting piece 1e2 located outside the housing 1. A sealing cover 1f is installed on the side of the housing 1 where the second positioning hole 1e is provided. The sealing cover 1f covers the second positioning hole 1e and the limiting hole 1c. A sliding rod 1f1 parallel to the axis of the second positioning hole 1e is provided inside the sealing cover 1f. The connecting piece 1e2 is slidably mounted on the sliding rod 1f1. A second spring 1f2 is sleeved on the sliding rod 1f1. The second spring 1f2 elastically connects the connecting piece 1e2 and the inner wall of the sealing cover 1f. The elastic force of the second spring 1f2 causes the connecting piece 1e2 to tend to move away from the housing 1; the top of the connecting piece 1e2 is provided with a sloping block 1e3, and a linear actuator 1f3 is installed inside the sealing cover 1f. The working end of the linear actuator 1f3 is located above the sloping block 1e3 and is set to move in the vertical direction. When the working end of the linear actuator 1f3 presses down on the sloping block 1e3, the connecting piece 1e2 stretches the second spring 1f2 so that the locking rod 1e1 is inserted into the second positioning hole 1e and the first positioning hole 1b5.

[0036] Under normal conditions, the lifting frame 1b is at its highest position. At this time, the connector 2 of the connecting cable and the insert 2a are connected together. The first spring 1b3 under the lifting frame 1b is in a stretched state. The insert shaft 1a1 is located at the top of the limiting hole 1c. The first positioning hole 1b5 on the lifting frame 1b is coaxially aligned with the second positioning hole 1e of the housing 1. The working end of the linear actuator 1f3 inside the sealing cover 1f moves downward in the vertical direction, pressing the inclined block 1e3 on the top of the connecting piece 1e2. The vertical pressure of the linear actuator 1f3 is converted into a horizontal force that pushes the connecting piece 1e2 towards the housing 1. The connecting piece 1e2 slides along the slide rod 1f1, so that the locking rod 1e1 on the connecting piece 1e2 passes through the second positioning hole 1e and is precisely inserted into the first positioning hole 1b5, locking the lifting frame 1b at the current height. The top of the locking rod 1e1 can be the round end located in the first positioning hole 1b5. At this time, the second spring 1f2 on the slide rod 1f1 is in a stretched state. When the control unit 3 detects a cable fault, it immediately instructs the linear driver 1f3 to reset upwards, releasing the pressure on the inclined block 1e3. The second spring 1f2 releases its stored tension, pulling the connecting piece 1e2 along the slide rod 1f1 away from the housing 1. Simultaneously, the locking rod 1e1 exits from the first positioning hole 1b5 and the second positioning hole 1e, quickly releasing the locking state of the lifting frame 1b. At this time, the tension of the first spring 1b3, combined with the weight of the cable itself, pulls the lifting frame 1b vertically downwards along the guide rod 1b2. As the lifting frame 1b moves downwards, the insertion shaft 1a1 on the moving seat 1a slides along the limiting hole 1c, ultimately causing the connector 2 to separate horizontally from the connector seat 2a, cutting off the fault circuit. The alarm 4 simultaneously triggers a fault warning. During the final reset operation, the operator moves the lifting frame 1b upwards using the top pull rod 1b4 until the insertion shaft 1a1 returns to the top of the limiting hole 1c. Then, in conjunction with the linear actuator 1f3, the locking rod 1e1 is inserted into the first positioning hole 1b5 and the second positioning hole 1e. The linear actuator 1f3 can be an electric push rod. In this embodiment, in case of a fault, the linear actuator 1f3 only needs to release the pressure on the inclined block 1e3, and the second spring 1f2 can quickly pull the locking rod 1e1 out. The first spring 1b3 instantly releases its elastic force to push the lifting frame 1b downwards, greatly shortening the response time of the lifting frame from locking to downward movement. This accelerates the separation speed of the connector 2 and the connector 2a, allowing for a more timely disconnection of the faulty circuit.

[0037] In order to achieve the goal of automatically activating the alarm 4 when the control unit 3 detects a fault, the following features are specifically set: The warning device 4 includes a mounting box 4a installed at the bottom of the housing 1. A warning light 4b is installed inside the mounting box 4a. A through hole 4a1 coaxial with the guide hole 1d is provided on the mounting box 4a. A contact sensor 4a2 located below the through hole 4a1 is installed inside the mounting box 4a. The contact sensor 4a2 is connected to the warning light 4b via a signal from the control unit 3.

[0038] The control unit 3 includes a PLC controller 3a that connects the linear driver 1f3 and the warning light 4b, and a temperature sensor 3b for detecting the cable temperature.

[0039] In this embodiment, the temperature sensor 3b of the control unit 3 monitors the cable temperature in real time. When the cable temperature becomes abnormal due to overload or insulation failure, the temperature sensor 3b detects that the temperature exceeds the preset threshold and immediately transmits a fault signal to the PLC controller 3a. The PLC controller 3a is in signal listening mode and, upon receiving the fault signal, activates the linear driver 1f3 to disconnect the cable. The guide rod 1b2 moves down with the lifting frame 1b, and its lower end passes through the through hole 4a1 of the mounting box 4a, gradually approaching and finally contacting the contact sensor 4a2. After the contact sensor 4a2 is triggered, it feeds back the trigger signal to the PLC controller 3a. The PLC controller 3a immediately sends a power-on signal to the warning light 4b, which lights up to provide a fault warning. In this embodiment, the warning device 4 directly uses the guide rod 1b2 of the lifting frame as the trigger condition for the contact sensor 4a2. The triggering timing is accurate, and the warning light 4b directly marks the location of the fault terminal through a visual light signal. The operator does not need to check the cables one by one or disassemble the device; they can quickly locate the fault point through the warning light.

[0040] Working principle: When connecting cables, the lifting frame 1b is moved to the upper position inside the housing 1. At this time, the connector 2 of the connecting cable is inserted and connected to the connector 2a to achieve conductive connection at the cable end. When the control unit 3 detects an abnormality at the cable end and needs to cut off the circuit, the control unit 3 drives the lifting frame 1b to move downward. As the lifting frame 1b moves downward, the insertion shaft 1a1 on the moving seat 1a slides along the wall of the limiting hole 1c in the housing 1. As the distance between the two limiting holes 1c gradually increases downward, the insertion shaft 1a1, guided by the limiting hole 1c, drives the two moving seats 1a to separate horizontally in opposite directions along the lifting frame 1b, thereby causing the inserted connector 2 to disengage from the connector 2a, achieving circuit cutoff at the cable end. When the connector 2 and the connector 2a are completely separated, the alarm 4 is triggered and emits an alarm signal, indicating that the terminal has been cut off and there is a fault in the circuit.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A high-voltage cable terminal protection device, characterized in that, Includes a housing (1), and a connector (2) and a socket (2a) installed at the cable end and located inside the housing (1). The connector (2) and the socket (2a) are inserted and connected inside the housing (1). The connector (2) and the socket (2a) are respectively installed on a movable base (1a). The two movable bases (1a) are slidably installed on a horizontal lifting frame (1b). The lifting frame (1b) is slidably installed inside the housing (1) and moves vertically. a) A horizontal insertion shaft (1a1) is provided on the housing (1). The insertion shaft (1a1) is inserted into the limiting hole (1c) provided on the housing (1). The distance between the two limiting holes (1c) gradually increases downward. When the moving seat (1a) is located at the top of the limiting hole (1c), the plug (2) and the plug seat (2a) are inserted and connected. When the lifting frame (1b) moves down, the insertion shaft (1a1) moves in the limiting hole (1c) and drives the plug (2) and the plug seat (2a) to separate. The housing (1) is provided with a control unit (3) for controlling the lifting of the lifting frame (1b) and a warning device (4) for warning after the connector (2) and the socket (2a) are separated.

2. The high-voltage cable terminal protection device according to claim 1, characterized in that, The limiting hole (1c) includes a vertical section (1c1) and an expansion section (1c2) connecting the bottom end of the vertical section (1c1). The width of the vertical section (1c1) and the expansion section (1c2) is the same as the diameter of the insertion shaft (1a1).

3. The high-voltage cable terminal protection device according to claim 1, characterized in that, The housing (1) has vertically extending clearance openings at both ends.

4. A high-voltage cable terminal protection device according to claim 1, characterized in that, The lifting frame (1b) is provided with a waist-shaped hole (1b1) that extends horizontally to the axis of the insertion shaft (1a1). A vertical limiting bolt (1a2) is installed on the top of the moving seat (1a). The diameter of the limiting bolt (1a2) is the same as the width of the waist-shaped hole (1b1). The limiting bolt (1a2) is inserted into the waist-shaped hole (1b1) to limit its movement.

5. A high-voltage cable terminal protection device according to claim 4, characterized in that, The bottom of the lifting frame (1b) is provided with several vertical guide rods (1b2). The guide rods (1b2) are inserted into the guide holes (1d) at the bottom of the housing (1). A first spring (1b3) is sleeved on the guide rod (1b2). The first spring (1b3) elastically connects the bottom of the lifting frame (1b) and the bottom of the housing (1). The first spring (1b3) makes the lifting frame (1b) have a downward tendency. The top of the lifting frame (1b) is provided with a pull rod (1b4) extending vertically to the outside of the housing (1). The side of the lifting frame (1b) that is in contact with the housing (1) is provided with a first positioning hole (1b5). The housing (1) is provided with a second positioning hole (1e). When the lifting frame (1b) moves up to the top of the insertion shaft (1a1) at the limit hole (1c), the second positioning hole (1e) and the first positioning hole (1b5) are on the same straight line. The locking rod (1e1) coaxially installed in the second positioning hole (1e) is inserted into the first positioning hole (1b5) to lock the height position of the lifting frame (1b).

6. A high-voltage cable terminal protection device according to claim 5, characterized in that, The locking rod (1e1) is installed on the connecting piece (1e2) located outside the housing (1). A sealing cover (1f) is installed on the side of the housing (1) where the second positioning hole (1e) is provided. The sealing cover (1f) covers the second positioning hole (1e) and the limiting hole (1c). A sliding rod (1f1) parallel to the axis of the second positioning hole (1e) is provided inside the sealing cover (1f). The connecting piece (1e2) is slidably installed on the sliding rod (1f1). A second spring (1f2) is sleeved on the sliding rod (1f1). The second spring (1f2) elastically connects the connecting piece (1e2) and the inner wall of the sealing cover (1f). The elastic force of the second spring (1f2) makes the connecting piece (1e2) tend to move away from the housing (1). The top of the connecting piece (1e2) is provided with a ramp block (1e3), and a linear actuator (1f3) is installed inside the sealing cover (1f). The working end of the linear actuator (1f3) is located above the ramp block (1e3) and is set to move in the vertical direction. When the working end of the linear actuator (1f3) presses down on the ramp block (1e3), the connecting piece (1e2) stretches the second spring (1f2) so that the locking rod (1e1) is inserted into the second positioning hole (1e) and the first positioning hole (1b5).

7. A high-voltage cable terminal protection device according to claim 5, characterized in that, The warning device (4) includes a mounting box (4a) installed at the bottom of the housing (1), a warning light (4b) is provided inside the mounting box (4a), a through hole (4a1) coaxial with the guide hole (1d) is provided on the mounting box (4a), and a contact sensor (4a2) located below the through hole (4a1) is provided inside the mounting box (4a), and the contact sensor (4a2) is connected to the warning light (4b) via a signal from the control unit (3).

8. A high-voltage cable terminal protection device according to claim 7, characterized in that, The control unit (3) includes a PLC controller (3a) that signals to a linear driver (1f3) and a warning light (4b), and a temperature sensor (3b) for detecting the temperature of the cable.

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