An on-line monitoring method and device for cable joints based on stress wave

Abstract

The present invention relates to the technical field of cable joint monitoring, and discloses an on-line monitoring device for cable joints based on stress waves, which includes a housing and a stress sensor and a temperature detector installed in the housing. The housing is composed of two semi-circular clamping shells hinged to each other. Cable through-holes are provided at both ends of the semi-circular clamping shells. Two groups of cable fixing mechanisms are installed in the semi-circular clamping shells. A fireproof cylinder is fixedly installed through one of the semi-circular clamping shells. By setting the stress sensor, the present invention can monitor the cable joint in real time, feedback the signal to the receiver outside, and judge whether there is a sign of fracture in the connection between the cable joint and the cable, which is convenient for timely maintenance and reduces the possibility of fire caused by aging and fracture at the cable joint. Even if the cable joint catches fire, through the operation of the electric push rod and the cooperation of the sealing mechanism, the stress sensor and the temperature detector can be moved into the fireproof cylinder for protection to avoid being burned.

Description

Technical Field

[0001] The present invention relates to the technical field of cable joint monitoring, and specifically provides an on-line monitoring method and device for cable joints based on stress waves. Background Art

[0002] In the existing cable joints, after long-term operation, there may be aging and fracture, or even fire. After the fire, it will cause great harm to other surrounding operating cable lines. If not discovered and repaired in time, it may even cause a large fire. To avoid the occurrence of such accidents, it is necessary to monitor the temperature of the cable joints. For example, an on-line monitoring device for the state of a power cable joint disclosed in the patent with the authorization publication number CN218847443U and the authorization publication date of April 22, 2023, includes a housing and a temperature sensor for monitoring temperature. The housing includes a first housing and a second housing, the first housing and the second housing are hinged, the first housing and the second housing are fixedly connected through a fixing component, the temperature sensor is arranged in the first housing, the second housing is provided with a receiving block for fitting with the cable, the first housing is slidably provided with a sliding block along the direction of approaching or departing from the receiving block, both the sliding block and the receiving block are used for abutting against the cable, and the first housing is provided with a sliding member for driving the sliding block to slide; by buckling the first housing and the second housing on the cable and the joint, when facing cables with different diameters, the sliding block can be driven to move through the sliding member, so that the sliding block and the receiving block can clamp and fix the cable.

[0003] At present, for the existing on-line monitoring device for the state of cable joints, in order to make the detection effect more accurate, the monitoring instrument needs to be in contact with the cable joint. However, once a fire occurs due to the high temperature of the cable joint, the monitoring instrument will be burned. For example, in the above-mentioned prior art, although the fire can be extinguished later, it cannot avoid the monitoring instrument being well protected after the fire. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an on-line monitoring device for cable joints based on stress waves, which solves the problem that the existing on-line monitoring device for the state of cable joints cannot provide good protection for the monitoring instrument after heating and catching fire.

[0005] To achieve the above object, the present invention provides the following technical solution: An on-line monitoring device for cable joints based on stress waves, comprising a housing and a stress sensor and a temperature detector installed inside the housing. The housing is composed of two semi-circular clamping shells hinged to each other. Both ends of the semi-circular clamping shell are provided with cable through-holes. Two sets of cable fixing mechanisms are installed inside the semi-circular clamping shell. A fireproof cylinder is fixedly installed through one of the semi-circular clamping shells. Connecting shells are fixedly installed at the cable through-holes of the semi-circular clamping shell. A full-air airbag is fixedly installed inside the connecting shell far from the fireproof cylinder, and an inflatable airbag is fixedly installed inside the connecting shell close to the fireproof cylinder. An electric push rod is installed through the upper end of the fireproof cylinder. One end of the electric push rod is fixedly installed with a telescopic member. The stress sensor and the temperature detector are installed at the end of the telescopic member of the temperature detector. An outlet is opened at the lower end of the fireproof cylinder. A sealing mechanism for sealing the fireproof cylinder is rotatably arranged at the lower end of the fireproof cylinder. A connecting mechanism for controlling the opening and closing of the sealing mechanism is fixedly sleeved on the electric push rod. An air charging and discharging mechanism is arranged between the fireproof cylinder and the inflatable airbag, and the air charging and discharging mechanism is connected to the connecting mechanism.

[0006] Preferably, the sealing mechanism includes two fireproof plates. On one side of the two fireproof plates, gears that mesh with each other are fixedly installed, and the gears are rotatably connected to the fireproof cylinder.

[0007] Preferably, the connecting mechanism includes a piston plate fixedly sleeved on the electric push rod. Two rotating rods are rotatably connected inside the fireproof cylinder. One of the rotating rods is fixedly connected to one of the gears. An arc-shaped groove and a vertical groove are opened on the outer side of the rotating rod, and the arc-shaped groove and the vertical groove are communicated. A through-hole matching the size of the rotating rod is penetrated through the piston plate, and a sliding block slidably connected to the arc-shaped groove and the vertical groove is fixedly connected to the side wall of the through-hole.

[0008] Preferably, the air charging and discharging mechanism includes an air guide pipe fixedly communicated with the fireproof cylinder and the inflatable airbag.

[0009] Preferably, a wire winding disc is fixedly installed at the upper end of the rotating rod, and a pull rope is fixedly wound on the wire winding disc. One end of the pull rope passes through the air guide pipe and is fixedly connected to the inflatable airbag.

[0010] Preferably, the telescopic member includes an installation cylinder fixedly connected to one end of the electric push rod. An installation column is slidably connected inside the installation cylinder. A second spring is fixedly installed between the installation column and the installation cylinder. The stress sensor and the temperature detector are installed at the end of the installation column.

[0011] Preferably, the fixing mechanism includes a fixing cylinder fixedly installed inside the semi-circular clamping shell. A sliding column is slidably connected inside the fixing cylinder. A first spring is fixedly arranged between the fixing cylinder and the sliding column. A clamping claw is fixedly installed at the outer end of the sliding column, and the clamping claws corresponding to the upper and lower positions are arranged in a staggered manner.

[0012] Preferably, mounting ears are fixedly installed on one side of the semi-circular clamping shell, and the two mounting ears are fixedly connected by bolts.

[0013] Preferably, both the fully inflated airbag and the inflatable airbag are fire-resistant rubber airbags.

[0014] A monitoring method for an on-line monitoring device of a cable joint based on stress wave includes the following steps:

[0015] a. Unfold the two semi-circular clamping shells, then clamp them on the outside of the cable joint, and then fix the two semi-circular clamping shells through the cooperation of the mounting ears and bolts;

[0016] b. After the two semi-circular clamping shells are closed, the two corresponding claws clamp and fix the cables on both sides of the cable joint; at the same time, the corresponding inflatable airbags and fully inflated airbags squeeze each other on the outside of the cable to seal the cable penetration;

[0017] c. Then control the electric push rod to work to push the mounting cylinder and the piston plate downward. The mounting cylinder pushes the mounting column downward, and the mounting column drives the stress sensor and the temperature detector downward. When the piston plate moves downward, the gas in the inflatable airbag is pumped into the fireproof cylinder through the air guide pipe. When the piston plate just moves downward, the slider is slidably connected with the arc-shaped groove, pushing the two rotating rods to rotate. The rotating rods drive the two wire winding discs to rotate, and the wire winding discs wind up the pulling ropes. The pulling ropes pull the inflatable airbags to move, so that the cable penetration is opened for ventilation and heat dissipation. When the rotating rods rotate, they drive the gears to rotate, and the gears drive the fireproof plate to move to open the outlet; the mounting cylinder and the piston plate continue to move downward, the slider slides into the vertical groove, and the mounting column drives the stress sensor and the temperature detector downward to contact the cable joint;

[0018] d. The stress sensor can monitor in real time and feedback the signal to the receiver outside to judge whether there is a sign of breakage in the connection between the cable joint and the cable, which is convenient for timely maintenance and reduces the possibility of fire caused by aging and breakage at the cable joint; at the same time, the temperature detector is used to detect the temperature of the cable joint. When the temperature is relatively high and there may be a fire, the electric push rod can be started to drive the mounting cylinder and the piston plate to move upward;

[0019] e. The mounting cylinder brings the stress sensor and the temperature detector into the fireproof cylinder through the mounting column. At this time, the piston plate drives the slider to slide in the vertical groove, and then the piston plate drives the slider to slide into the arc-shaped groove, controlling the rotating rod to rotate, and sealing the outlet through the fireproof plate to protect the stress sensor and the temperature detector. When the piston plate moves, it inflates the inflatable airbag through the air guide pipe to seal the cable penetration;

[0020] f. If a fire occurs inside the shell, after a period of time, a small amount of oxygen is exhausted, and the fire will not spread in an oxygen-free environment.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By providing a stress sensor, the present invention can monitor the cable joint in real time, feedback the signal to an external receiver, and determine whether there is a sign of breakage in the connection between the cable joint and the cable, which is convenient for timely maintenance and reduces the possibility of fire caused by aging and breakage at the cable joint. Even if a fire breaks out at the cable joint, through the operation of the electric push rod and the cooperation of the sealing mechanism, the stress sensor and the temperature detector can be moved into the fireproof cylinder for protection to avoid being burned.

[0023] 2. By fixedly sleeving a piston plate on the electric push rod, and the slider on the piston plate is slidably connected with the arc-shaped groove and the vertical groove of the rotating rod. After moving the stress sensor and the temperature detector into the fireproof cylinder by controlling the electric push rod, the fireproof plate can be controlled to move to seal the fireproof cylinder to protect the stress sensor and the temperature detector.

[0024] 3. By fixedly connecting a gas guide pipe between the fireproof cylinder and the inflatable airbag, during the process of moving the stress sensor and the temperature detector into the fireproof cylinder by controlling the electric push rod, the inflatable airbag is inflated through the movement of the piston plate to seal the cable penetration opening. If a fire breaks out inside the housing, after a period of time, a small amount of oxygen is exhausted, and the fire will not spread in an oxygen-free environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic perspective view of the overall structure of the present invention;

[0026] Figure 2 is a schematic perspective sectional view of the overall structure of the present invention;

[0027] Figure 3 is Figure 2 an enlarged schematic view of A in

[0028] Figure 4 is Figure 2 an enlarged schematic view of B in

[0029] Figure 5 is a schematic perspective sectional view of the fixing mechanism of the present invention;

[0030] Figure 6 is an unfolded schematic view of the piston plate and the rotating rod of the present invention;

[0031] Figure 7 is a schematic perspective sectional view of the fireproof cylinder of the present invention;

[0032] Figure 8 is Figure 7 an enlarged schematic view of C in

[0033] In the figure: 1. Semi-circular clamping shell; 2. Electric push rod; 3. Fireproof cylinder; 4. Bolt; 5. Mounting ear; 6. Temperature detector; 7. Air duct; 8. Full-air airbag; 9. Slide column; 10. Fixed cylinder; 11. Claw; 12. Cable through-hole; 13. Inflatable airbag; 14. Piston plate; 15. Rotating rod; 16. Stress sensor; 17. Mounting column; 18. Mounting cylinder; 19. Pulling rope; 20. Wire reel; 21. Fireproof board; 22. Outlet; 23. Gear; 24. Second spring; 25. Perforation; 26. Slide block; 27. Vertical groove; 28. Arc groove; 29. First spring; 30. Connecting housing; 31. Cable connector. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Please refer to Figures 1-8 , an on-line monitoring device for cable joints based on stress waves, including a housing and a stress sensor 16 and a temperature detector 6 installed in the housing. The stress sensor 16 and the temperature detector 6 are both prior arts and will not be elaborated here. The housing is composed of two semi-circular clamping shells 1 hinged to each other. One side of the semi-circular clamping shell 1 is fixedly installed with a mounting ear 5, and the two mounting ears 5 are fixedly connected by bolts 4. Cable through-holes 12 are opened at both ends of the semi-circular clamping shell 1. Two groups of cable fixing mechanisms are installed in the semi-circular clamping shell 1. The fixing mechanism includes a fixed cylinder 10 fixedly installed inside the semi-circular clamping shell 1. A slide column 9 is slidably connected inside the fixed cylinder 10. A first spring 29 is fixedly arranged between the fixed cylinder 10 and the slide column 9. A claw 11 is fixedly installed at the outer end of the slide column 9. The upper and lower claws 11 corresponding to each other are arranged in a staggered manner. Through the cooperation of the first spring 29 and the staggered claws 11, different-diameter cables can be fixed after the semi-circular clamping shell 1 is closed;

[0036] One of the semi-circular clamping shells 1 is fixedly installed with a fireproof cylinder 3 through it. Connecting shells 30 are fixedly installed at the cable through-ports 12 of the semi-circular clamping shell 1. A full-air airbag 8 is fixedly installed in the connecting shell 30 far from the fireproof cylinder 3, and an inflatable airbag 13 is fixedly installed in the connecting shell 30 close to the fireproof cylinder 3. Both the full-air airbag 8 and the inflatable airbag 13 are fire-resistant rubber airbags. An electric push rod 2 is installed through the upper end of the fireproof cylinder 3. One end of the electric push rod 2 is fixedly installed with a telescopic member. A stress sensor 16 and a temperature detector 6 are installed at the end of the telescopic member of the temperature detector 6. The telescopic member includes a mounting cylinder 18 fixedly connected to one end of the electric push rod 2. A mounting column 17 is slidably connected in the mounting cylinder 18. A second spring 24 is fixedly installed between the mounting column 17 and the mounting cylinder 18. The stress sensor 16 and the temperature detector 6 are installed at the end of the mounting column 17. Through the cooperation of the second spring 24, the stress sensor 16 and the temperature detector 6 can contact cable joints 31 with different diameters. An outlet 22 is opened at the lower end of the fireproof cylinder 3. A sealing mechanism for sealing the fireproof cylinder 3 is rotatably arranged at the lower end of the fireproof cylinder 3. A connecting mechanism for controlling the opening and closing of the sealing mechanism is fixedly sleeved on the electric push rod 2. An air charging and discharging mechanism is arranged between the fireproof cylinder 3 and the inflatable airbag 13. The air charging and discharging mechanism is connected to the connecting mechanism.

[0037] As a further solution of the present invention, the sealing mechanism includes two fireproof plates 21. Meshing gears 23 are fixedly installed on one side of the two fireproof plates 21. The gears 23 are rotatably connected to the fireproof cylinder 3. The connecting mechanism includes a piston plate 14 fixedly sleeved on the electric push rod 2. Two rotating rods 15 are rotatably connected in the fireproof cylinder 3. One of the rotating rods 15 is fixedly connected to one of the gears 23. An arc-shaped groove 28 and a vertical groove 27 are opened on the outer side of the rotating rod 15. The arc-shaped groove 28 and the vertical groove 27 are communicated. A through-hole 25 matching the size of the rotating rod 15 is opened through the piston plate 14. A slider 26 slidably connected to the arc-shaped groove 28 and the vertical groove 27 is fixedly connected to the side wall of the through-hole 25. The air charging and discharging mechanism includes an air guide pipe 7 fixedly communicated with the fireproof cylinder 3 and the inflatable airbag 13. A wire winding disc 20 is fixedly installed at the upper end of the rotating rod 15. A pull rope 19 is fixedly wound on the wire winding disc 20. One end of the pull rope 19 passes through the air guide pipe 7 and is fixedly connected to the inflatable airbag 13. By controlling the electric push rod 2 to work, after a fire occurs, the stress sensor 16 and the temperature detector 6 can be moved into the fireproof cylinder 3, and the fireproof plates 21 can be controlled to seal the outlet 22 for protection. At the same time, the inflatable airbag 13 is inflated to seal the cable through-port 12, so that after a period of time when a fire occurs, a small amount of oxygen is exhausted, and the fire will not spread in an oxygen-free environment.

[0038] A monitoring method for an on-line monitoring device of a cable joint based on stress wave includes the following steps:

[0039] a. Unfold the two semi-circular clamping shells 1, then clamp them outside the cable joint 31, and then fix the two semi-circular clamping shells 1 through the cooperation of the mounting ears 5 and the bolts 4;

[0040] b. After the two semi-circular clamping shells 1 are closed, the two corresponding claws 11 clamp and fix the cables on both sides of the cable joint 31; at the same time, the corresponding inflatable airbag 13 and the full-air airbag 8 are pressed against each other outside the cable to seal the cable through-hole 12;

[0041] c. Then control the electric push rod 2 to work to push the mounting cylinder 18 and the piston plate 14 downward. The mounting cylinder 18 pushes the mounting column 17 downward, and the mounting column 17 drives the stress sensor 16 and the temperature detector 6 downward. When the piston plate 14 moves downward, the gas in the inflatable airbag 13 is pumped into the fireproof cylinder 3 through the air duct 7. When the piston plate 14 just starts to move downward, the slider 26 is slidably connected to the arc-shaped groove 28, pushing the two rotating rods 15 to rotate. The rotating rods 15 drive the two wire-reeling discs 20 to rotate. The wire-reeling discs 20 reel in the pulling rope 19, and the pulling rope 19 pulls the inflatable airbag 13 to move, so that the cable through-hole 12 is opened for ventilation and heat dissipation. When the rotating rods 15 rotate, they drive the gear 23 to rotate, and the gear 23 drives the fireproof plate 21 to move to open the outlet 22; the mounting cylinder 18 and the piston plate 14 continue to move downward, the slider 26 slides into the vertical groove 27, and the mounting column 17 pushes the stress sensor 16 and the temperature detector 6 downward to contact the cable joint 31;

[0042] d. The stress sensor 16 can monitor in real time and feedback the signal to the external receiver to judge whether there is a sign of breakage in the connection between the cable joint 31 and the cable, which is convenient for timely maintenance and reduces the possibility of fire caused by aging and breakage at the cable joint 31; at the same time, the temperature detector 6 is used to detect the temperature of the cable joint 31. When the temperature is relatively high and there may be a fire, the electric push rod 2 can be started to drive the mounting cylinder 18 and the piston plate 14 to move upward;

[0043] e. The mounting cylinder 18 brings the stress sensor 16 and the temperature detector 6 into the fireproof cylinder 3 through the mounting column 17. At this time, the piston plate 14 drives the slider 26 to slide in the vertical groove 27, and then the piston plate 14 drives the slider 26 to slide into the arc-shaped groove 28, controlling the rotating rod 15 to rotate, and sealing the outlet 22 through the fireproof plate 21 to protect the stress sensor 16 and the temperature detector 6. When the piston plate 14 moves, it inflates the inflatable airbag 13 through the air duct 7 to seal the cable through-hole 12;

[0044] f. If a fire occurs inside the housing, after a period of time, a small amount of oxygen is exhausted, and the fire will not spread in an oxygen-free environment.

[0045] Finally, it should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0046] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An on-line monitoring device for cable joints based on stress wave, comprising a housing and a stress sensor (16) and a temperature detector (6) installed in the housing, characterized in that, The housing is composed of two semi-circular clamping shells (1) hinged to each other. Cable through-holes (12) are provided at both ends of the semi-circular clamping shell (1). Two groups of cable fixing mechanisms are installed inside the semi-circular clamping shell (1). A fireproof cylinder (3) is fixedly installed through one of the semi-circular clamping shells (1). Connecting shells (30) are fixedly installed at the cable through-holes (12) of the semi-circular clamping shell (1). A full-air airbag (8) is fixedly installed inside the connecting shell (30) far from the fireproof cylinder (3), and an inflatable airbag (13) is fixedly installed inside the connecting shell (30) close to the fireproof cylinder (3). An electric push rod (2) is installed through the upper end of the fireproof cylinder (3). One end of the electric push rod (2) is fixedly installed with a telescopic member. The stress sensor (16) and the temperature detector (6) are installed at the end of the telescopic member of the temperature detector (6). An outlet (22) is provided at the lower end of the fireproof cylinder (3). A sealing mechanism for sealing the fireproof cylinder (3) is rotatably provided at the lower end of the fireproof cylinder (3). A connecting mechanism for controlling the opening and closing of the sealing mechanism is fixedly sleeved on the electric push rod (2). An air charging and discharging mechanism is provided between the fireproof cylinder (3) and the inflatable airbag (13). The air charging and discharging mechanism is connected to the connecting mechanism; The sealing mechanism includes two fireproof plates (21). Meshing gears (23) are fixedly installed on one side of the two fireproof plates (21). The gears (23) are rotatably connected to the fireproof cylinder (3); The connecting mechanism includes a piston plate (14) fixedly sleeved on the electric push rod (2). Two rotating rods (15) are rotatably connected inside the fireproof cylinder (3). One of the rotating rods is fixedly connected to one of the gears (23). An arc-shaped groove (28) and a vertical groove (27) are provided on the outer side of the rotating rod (15). The arc-shaped groove (28) and the vertical groove (27) are communicated. A through-hole (25) matching the size of the rotating rod (15) is provided through the piston plate (14). A slider (26) slidably connected to the arc-shaped groove (28) and the vertical groove (27) is fixedly connected to the side wall of the through-hole (25); The air charging and discharging mechanism includes an air guide pipe (7) fixedly communicated with the fireproof cylinder (3) and the inflatable airbag (13).

2. The on-line monitoring device for cable joints based on stress wave according to claim 1, characterized in that A wire winding disc (20) is fixedly installed at the upper end of the rotating rod (15). A pull rope (19) is fixedly wound on the wire winding disc (20). One end of the pull rope (19) passes through the air guide pipe (7) and is fixedly connected to the inflatable airbag (13).

3. The on-line monitoring device for cable joints based on stress wave according to claim 2, characterized in that The telescopic member includes a mounting cylinder (18) fixedly connected to one end of the electric push rod (2). A mounting column (17) is slidably connected inside the mounting cylinder (18). A second spring (24) is fixedly installed between the mounting column (17) and the mounting cylinder (18). The stress sensor (16) and the temperature detector (6) are installed at the end of the mounting column (17).

4. The on-line monitoring device for cable joints based on stress wave according to claim 3, characterized in that, The fixing mechanism includes a fixing cylinder (10) fixedly installed inside the semi-circular clamping shell (1). A sliding column (9) is slidably connected inside the fixing cylinder (10). A first spring (29) is fixedly arranged between the fixing cylinder (10) and the sliding column (9). A claw (11) is fixedly installed at the outer end of the sliding column (9). The two claws (11) corresponding to the upper and lower positions are arranged in a staggered manner.

5. The on-line monitoring device for cable joints based on stress wave according to claim 4, characterized in that, An installation ear (5) is fixedly installed on one side of the semi-circular clamping shell (1). The two installation ears (5) are fixedly connected by bolts (4).

6. The on-line monitoring device for cable joints based on stress wave according to claim 5, characterized in that, Both the fully inflated airbag (8) and the inflatable airbag (13) are fire-resistant rubber airbags.

7. The monitoring method of an on-line monitoring device for cable joints based on stress waves according to claim 6, characterized in that It includes the following steps: a. Unfold the two semi-circular clamping shells (1), then clamp them on the outer side of the cable joint (31), and then fix the two semi-circular clamping shells (1) through the cooperation of the installation ears (5) and the bolts (4). b. After the two semi-circular clamping shells (1) are closed, the two claws (11) corresponding to the positions clamp and fix the cables on both sides of the cable joint (31); at the same time, the corresponding inflatable airbag (13) and the fully inflated airbag (8) are mutually pressed on the outer side of the cable to seal the cable penetration (12). c. Then control the electric push rod (2) to work to push the installation cylinder (18) and the piston plate (14) downward. The installation cylinder (18) pushes the installation column (17) downward. The installation column (17) drives the stress sensor (16) and the temperature detector (6) downward. When the piston plate (14) moves downward, through the air duct (7), the gas in the inflatable airbag (13) is pumped into the fireproof cylinder (3). When the piston plate (14) just starts to move downward, the slider (26) is slidably connected to the arc-shaped groove (28), pushing the two rotating rods (15) to rotate. The rotating rods (15) drive the two wire winding discs (20) to rotate. The wire winding discs (20) wind up the pulling rope (19). The pulling rope (19) pulls the inflatable airbag (13) to move, so that the cable penetration (12) is opened for ventilation and heat dissipation. When the rotating rod (15) rotates, it drives the gear (23) to rotate. The gear (23) drives the fireproof plate (21) to move, opening the outlet (22); the installation cylinder (18) and the piston plate (14) continue to move downward, the slider (26) slides into the vertical groove (27), and the installation column (17) pushes the stress sensor (16) and the temperature detector (6) downward to contact the cable joint (31). d. The stress sensor (16) can monitor in real time and feedback the signal to the receiver outside to judge whether there is a sign of breakage in the connection between the cable joint (31) and the cable, facilitating timely maintenance and reducing the possibility of fire caused by aging and breakage at the cable joint (31); at the same time, the temperature detector (6) is used to detect the temperature of the cable joint (31). When the temperature is relatively high and there is a possibility of fire, the electric push rod (2) can be started to drive the installation cylinder (18) and the piston plate (14) to move upward. e. The installation cylinder (18) brings the stress sensor (16) and the temperature detector (6) into the fireproof cylinder (3) through the installation column (17). At this time, the piston plate (14) drives the slider (26) to slide in the vertical groove (27), and then the piston plate (14) drives the slider (26) to slide into the arc groove (28), controlling the rotation of the rotating rod (15), and sealing the outlet (22) through the fireproof plate (21) to protect the stress sensor (16) and the temperature detector (6). When the piston plate (14) moves, it inflates the inflatable airbag (13) through the air duct (7) to seal the cable penetration (12); f. If a fire breaks out inside the housing, after a period of time, a small amount of oxygen is exhausted, and the fire will not spread in an oxygen-free environment.

Images