Plug joint for supporting and sealing of cable ducts and method for monitoring tightness of plug

Abstract

The application relates to the technical field of cable protection pipe and discloses a plugging joint for supporting and sealing a cable protection pipe and a sealing degree monitoring method of the plugging joint, which comprises a cable protection pipe, a sealing plug, an inner plug structure, an outer sealing structure and a supporting structure. The first push rod is driven to rotate and outwardly eject by an electric push rod, the first push rod, the triangular push rod, the second push rod and the third push rod are all rotationally matched, the second push rod and the third push rod are driven to outwardly eject at the same time, the outer expansion plate is expanded outwardly, two groups of sealing rings on the outer expansion plate are in contact with the inner wall of the cable protection pipe, the inside of the cable protection pipe is sealed, the inner plug structure can be applied to cable protection pipes with different diameters, the use rate is improved, and the cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of cable protection pipes, specifically relating to a sealing joint for cable protection pipe support and a method for monitoring the sealing degree of the plug. Background Technology

[0002] A cable is an electrical energy or signal transmission device, usually composed of several or several groups of conductors. There are power cables, control cables, high temperature cables, signal cables, fire-resistant cables, marine cables, aluminum alloy cables, etc. They are all composed of single or multiple strands of conductors and insulation layers, and are used to connect circuits, electrical appliances, etc.

[0003] When cables emerge from the ground, cable protection pipes are installed to protect them, and the ends of the cable protection pipes are sealed. However, with current technology, the sealing head is mostly selected according to the inner diameter of the pipe to be sealed, which is quite troublesome. Different diameter cable protection pipes require different sized sealing heads, which is not only costly but also results in poor sealing of the pipe.

[0004] This application proposes a sealing joint for cable conduit support and a method for monitoring the sealing performance of the plug, thereby improving upon the aforementioned defects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a sealing joint for cable conduit support and sealing with sealing function applicable to cable conduits of different diameter specifications and a method for monitoring the sealing degree of the plug.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A sealing joint for cable conduit support and sealing, and a method for monitoring the sealing degree of the plug, the structure of which includes a cable conduit, a sealing plug, a button and a limit block, both ends of the cable conduit are equipped with sealing plugs, the sealing plugs can seal the cable conduit and protect the internal cable, and one end of the sealing plug is equipped with a button and a limit block.

[0008] In one specific implementation scheme, the sealing plug includes a base, an inner plug structure, an outer sealing structure, and a support structure. The inner plug structure, the outer sealing structure, and the support structure are installed sequentially from the inside to the outside on the base. The bottom of the outer sealing structure is built into the interior of the base, and the support structure is installed on the outer sealing structure with a clearance fit.

[0009] In one specific implementation scheme, the inner plug structure includes a mounting base, a telescopic frame, an outer expansion plate, a linkage mechanism, an electric actuator, a sealing ring, and a plug plate. Several telescopic frames are arrayed on the outer side of the mounting base. An outer expansion plate is fixed to the telescopic rod of each of the telescopic frames. Both the upper and lower ends of each outer expansion plate are connected to a linkage mechanism. Two linkage mechanisms are symmetrically arranged. Each linkage mechanism is connected to and rotatably engaged with the central spindle of the mounting base. An electric actuator, electrically connected to the button, is fixed to the spindle end face of the mounting base. The telescopic rod of the electric actuator is connected to the linkage mechanism. Two sealing rings are installed on the outer walls of the outer expansion plates. A plug plate is fixed to the bottom of the mounting base.

[0010] In one specific implementation scheme, the expansion plate includes a locking post, an elastic cover, and a telescopic post. The bottom of the expansion plate is fixed with a locking post, and the bottom of the inner wall of several expansion plates is fixed with an elastic cover. The elastic cover is made of elastic waterproof fabric. A telescopic post is fixed between each pair of adjacent expansion plates, and both ends of the telescopic post are connected to the expansion plate.

[0011] In one specific implementation, one side of the blocking plate has a plurality of sliding grooves, and the plurality of sliding grooves are slidably engaged with the locking post.

[0012] In one specific implementation scheme, the linkage mechanism includes a first push rod, a triangular push rod, a second push rod, and a third push rod. The first push rod is fixed to the telescopic rod of the electric push rod. One end of the first push rod is rotatably engaged with the outer expansion plate, and the other end of the first push rod is rotatably engaged with one end of the triangular push rod. A second push rod is rotatably engaged at the second corner of the triangular push rod, and the other end of the second push rod is rotatably engaged with the outer expansion plate. A third push rod is rotatably engaged at the third corner of the triangular push rod, and the other end of the third push rod is rotatably engaged with the outer expansion plate.

[0013] In one specific implementation scheme, the external sealing structure includes a main frame, a knob, a locking block, a spiral frame, a limiting groove, a clamping block, and a rubber sealing cover. The spiral frame is rotatably fitted at the center of the main frame. The central axis of the spiral frame passes through the base and is connected and fixed to the knob. The locking block is rotatably fitted on the knob. Four limiting grooves are arrayed on the main frame. Clamping blocks are slidably fitted on several of the limiting grooves. The bottom of the clamping block is movably engaged with the spiral frame. A rubber sealing cover is fixed on the inner sidewall of several of the clamping blocks.

[0014] In one specific implementation, the locking block can engage with several sets of limiting blocks provided on one side of the base, and the limiting blocks can restrict the rotation of the knob.

[0015] In one specific implementation scheme, the spiral groove on the spiral frame is a gradually converging structure. When the knob drives the spiral frame to rotate, the spiral frame will drive several clamping blocks that are in movable cooperation with it to move.

[0016] In one specific implementation scheme, the support structure includes an outer cover, a rotating shaft, a pressure plate, rubber columns, a lever, a mounting groove, a chamfer, a fixing groove, and an opening. The outer cover has a plurality of openings arranged in an array. A rotating shaft is installed at the bottom of each of the plurality of openings. A pressure plate is rotatably fitted onto each of the plurality of rotating shafts. Rubber columns are connected to both sides of the pressure plate. A lever is fixed to the side of each rubber column near the outside of the outer cover. Both the rubber columns and the lever are built into the mounting groove and can slide within the mounting groove. The mounting groove is formed on the outer cover. A chamfer is formed at the port of the mounting groove near the opening. A fixing groove is provided at one end of the mounting groove.

[0017] In one specific implementation, the diameter of the fixing groove is slightly smaller than the diameter of the lever, enabling the lever to be embedded and fixed.

[0018] According to the above-mentioned technical solution, the sealing joint for cable conduit support and sealing and the method for monitoring the sealing degree of the plug of the present invention have the following beneficial effects:

[0019] (1) The present invention adds an inner plug structure to the sealing plug. The electric push rod drives the first push rod to rotate and push it outward. The first push rod, the triangular push rod, the second push rod and the third push rod rotate and cooperate, which can drive the second push rod and the third push rod to push outward at the same time, so that the outer expansion plate expands outward. The two sets of sealing rings on the outer expansion plate contact the inner wall of the cable tube to seal the inside of the cable tube. The inner plug structure can be used for cable tubes of different diameters, improving the utilization rate and reducing the cost.

[0020] (2) The present invention installs an elastic cover at the bottom of the expansion plate. With the expansion of the expansion plate, the connected elastic cover will be stretched outward together, and cooperate with the sealing ring and the blocking plate to seal the inside of the cable conduit, thereby improving the sealing efficiency and sealing effect of the cable conduit.

[0021] (3) The present invention drives the screw frame to rotate by rotating the knob. The screw frame drives several clamping blocks that are in movable cooperation to slide back and forth under the limiting action of the limiting groove. This drives the rubber sealing cover connected to it to be adjusted so that it can wrap and seal the outside of the cable protection pipe, preventing external air and moisture from entering. It forms an inner and outer cooperation with the inner plug structure, increasing the sealing effect of the cable protection pipe, and can be applied to cable protection pipes of different diameters.

[0022] (4) The present invention provides a support structure on the outside of the outer sealing structure. Several pressure plates on the support structure press down and contact the rubber sealing cover and abut against it. As the pressure plates move, they will drive the rubber columns and levers connected on both sides to slide together in the mounting groove until the levers are engaged with the fixing groove and stop. At this time, the pressure plates will contact the rubber sealing cover and abut against it, which can increase the sealing performance of the rubber sealing cover and make it less likely for the rubber sealing cover to loosen and cause moisture and air to enter the cable conduit, thus increasing the sealing effect. Attached Figure Description

[0023] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the sealing joint and plug sealing degree monitoring method for cable conduit support sealing in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the sealing plug in an embodiment of this application;

[0026] Figure 3 This is an exploded view of the sealing plug in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the inner plug structure in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the structure of the outer expansion plate in an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the linkage mechanism in the embodiments of this application;

[0030] Figure 7 This is an exploded view of the inner plug structure in an embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the external sealing structure in an embodiment of this application;

[0032] Figure 9 This is a schematic diagram of the structure of the rubber sealing cover in the embodiments of this application;

[0033] Figure 10 This is a schematic diagram of the supporting structure in an embodiment of this application;

[0034] Figure 11 This is a schematic diagram of the installation of the sealing plug and the cable conduit in an embodiment of this application.

[0035] In the diagram: Cable conduit-1, Sealing plug-2, Button-3, Limiting block-4, Base-21, Inner plug structure-22, Outer sealing structure-23, Support structure-24, Mounting base-221, Telescopic frame-222, Outer expansion plate-223, Linkage mechanism-224, Electric push rod-225, Sealing ring-226, Blocking plate-227, Locking post-11, Elastic cover-13, Telescopic column-14, Slide groove-12, First push rod- 31. Triangular push rod - 32. Second push rod - 33. Third push rod - 34. Main frame - 231. Knob - 232. Locking block - 233. Spiral frame - 234. Limiting groove - 235. Clamping block - 236. Rubber sealing cover - 237. Outer cover - 241. Rotating shaft - 242. Pressure plate - 243. Rubber column - 244. Toggle rod - 245. Mounting groove - 246. Chamfer - 247. Fixing groove - 248. Opening - 249. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] Example 1: Please refer to Figures 1-7 The specific embodiments of the present invention are as follows:

[0038] A sealing joint and a method for monitoring the sealing degree of a cable conduit support and seal are disclosed. The structure includes a cable conduit 1, a sealing plug 2, a button 3, and a limit block 4. Sealing plugs 2 are installed at both ends of the cable conduit 1. The sealing plugs 2 can seal the cable conduit 1 and protect the internal cable. A button 3 and a limit block 4 are installed at one end of the sealing plug 2.

[0039] Please see Figures 2-3 The sealing plug 2 includes a base 21, an inner plug structure 22, an outer sealing structure 23, and a support structure 24. The inner plug structure 22, the outer sealing structure 23, and the support structure 24 are installed on the base 21 from the inside to the outside. The bottom of the outer sealing structure 23 is built into the base 21. The support structure 24 is installed on the outer sealing structure 23 with a clearance fit. The inner plug structure 22 can seal the internal channel of the cable conduit 1, and the outer sealing structure 23 can seal the outer wall of the cable conduit 1.

[0040] Please see Figure 4The inner plug structure 22 includes a mounting base 221, a telescopic frame 222, an outer expansion plate 223, a linkage mechanism 224, an electric push rod 225, a sealing ring 226, and a plug plate 227. Several telescopic frames 222 are arranged on the outer side of the mounting base 221. An outer expansion plate 223 is fixed on the telescopic rod of each telescopic frame 222. The upper and lower ends of the outer expansion plates 223 are connected to the linkage mechanism 224. The two linkage mechanisms 224 are symmetrically arranged and can drive the outer expansion plates 223 to expand outward through the linkage mechanism 224. The linkage mechanism 224 is connected to and rotates with the central main shaft of the mounting base 221. An electric push rod 225, which is electrically connected to the button 3, is fixed on the end face of the main shaft of the mounting base 221. The telescopic rod of the electric push rod 225 is connected to the linkage mechanism 224. Two sealing rings 226 are installed on the outer wall of the outer expansion plates 223. A plug plate 227 is fixed at the bottom of the mounting base 221.

[0041] Please see Figures 4-7 The telescopic frame 222 has a multi-layer telescopic structure. When the outer expansion plate...

[0042] When 223 expands outward, it will pull the telescopic column inside the telescopic frame 222 to extend outward together, which can increase the stability of the movement of the expansion plate 223.

[0043] Please see Figures 4-5 The expansion plate 223 includes a locking post 11, an elastic cover 13, and a telescopic post 14. The locking post 11 is fixed to the bottom of the expansion plate. The elastic cover 13 is fixed to the bottom of the inner wall of several expansion plates 223. The elastic cover 13 is made of elastic waterproof fabric and can expand and contract together with the expansion plate 223. A telescopic post 14 is fixed between each two adjacent expansion plates 223. Both ends of the telescopic post 14 are connected to the expansion plate 223. When the expansion plate 223 expands outward, it can be stretched, increasing the stability and synchronicity of the connection between each two adjacent expansion plates 223.

[0044] Please see Figure 5 The blocking plate 227 has several sliding grooves 12 on one side, which are slidably engaged with the locking post 11. When the expansion plate 223 is expanding, the locking post 11 at the bottom will slide in the sliding groove 12, which plays a role in limiting and stabilizing the movement of the expansion plate 223.

[0045] Please see Figures 5-6The linkage mechanism 224 includes a first push rod 31, a triangular push rod 32, a second push rod 33, and a third push rod 34. The first push rod 31 is fixed to the telescopic rod of the electric push rod 225 and can be pushed outward by the electric push rod 225. One end of the first push rod 31 is rotatably engaged with the outer expansion plate 223, and the other end of the first push rod 31 is rotatably engaged with one end of the triangular push rod 32. The second push rod 33 is rotatably engaged with the second end of the triangular push rod 32, and the other end of the second push rod 33 is rotatably engaged with the outer expansion plate 223. The third push rod 34 is rotatably engaged with the third end of the triangular push rod 32, and the other end of the third push rod 34 is rotatably engaged with the outer expansion plate 223.

[0046] Please see Figures 4-7 The electric actuator 225 is driven by button 3. The electric actuator 225 drives the first actuator 31 connected to it to rotate on the main shaft of the mounting base 221 and push it outward. With the rotational engagement between the first actuator 31 and the triangular actuator 32, the second actuator 33 and the third actuator 34, the second actuator 33 and the third actuator 34 can be pushed outward at the same time when the first actuator 31 pushes outward. This causes the outer expansion plate 223 connected to it to expand outward in sync, and causes the sealing ring 226 to extend and retract outward together to contact the inner wall of the cable conduit 1. This method is suitable for sealing cable conduits 1 of different diameters.

[0047] Example 2: Please refer to Figures 8-11 The specific embodiments of the present invention are as follows:

[0048] Please see Figures 8-9 The outer sealing structure 23 includes a main frame 231, a knob 232, a locking block 233, a spiral frame 234, a limiting groove 235, a clamping block 236, and a rubber sealing cover 237. The spiral frame 234 is rotatably fitted at the center of the main frame 231. The central axis of the spiral frame 234 passes through the base 21 and is connected and fixed to the knob 232. The spiral frame 234 can be rotated by rotating the knob 232. The locking block 233 is rotatably fitted on the knob 232. Four limiting grooves 235 are arrayed on the main frame 231. Clamping blocks 236 are slidably fitted on several limiting grooves 235. The bottom of the clamping block 236 is movably engaged with the spiral frame 234. A rubber sealing cover 237 is fixed on the inner side wall of several clamping blocks 236.

[0049] Please see Figures 8-9 The locking block 233 can engage with several sets of limiting blocks 4 provided on one side of the base 21. The limiting blocks 4 can restrict the rotation of the knob 232. When the knob 232 is rotated to the desired position, the engagement of the locking block 233 and the limiting blocks 4 can prevent the knob 232 from reversing.

[0050] Please see Figures 8-9The spiral groove on the spiral frame 234 is a gradually converging structure. When the knob 232 drives the spiral frame 234 to rotate, the spiral frame 234 will drive several clamping blocks 236 that are in motion with it to move. Under the limiting action of the limiting groove 235, the clamping blocks 236 will slide back and forth on the limiting groove 235, thereby driving the rubber sealing cover 237 to adjust and wrap and seal the outer wall of the cable conduit 1 of different diameters.

[0051] Please see Figures 8-9 The rubber sealing cover 237 utilizes the properties of rubber material, which has elasticity and pressure resistance. It can be adjusted in size as the clamp 236 moves, thereby sealing and waterproofing cable conduits 1 of different diameters.

[0052] Please see Figure 10 The support structure 24 includes an outer cover 241, a rotating shaft 242, a pressure plate 243, rubber pillars 244, a lever 245, a mounting groove 246, a chamfer 247, a fixing groove 248, and an opening 249. The outer cover 241 has several openings 249 arranged in an array. A rotating shaft 242 is installed at the bottom of each of the openings 249. A pressure plate 243 is rotatably fitted on each of the rotating shafts 242. Rubber pillars 244 are connected to both sides of the pressure plate 243. A lever 245 is fixed to the side of the rubber pillar 244 near the outside of the outer cover 241. Both the rubber pillar 244 and the lever 245 are built into the mounting groove 246 and can slide within the mounting groove 246. The mounting groove 246 is opened on the outer cover 241. A chamfer 247 is opened at the port of the mounting groove 246 near the opening 249. A fixing groove 248 is provided at one end of the mounting groove 246.

[0053] Please see Figure 10 The diameter of the fixing groove 248 is slightly smaller than the diameter of the lever 245, which can embed and fix the lever 245, thereby fixing the positions of the rubber column 244 and the pressure plate 243.

[0054] Please see Figure 10 The chamfer 247 allows the pressure plate 243 to rotate inward to contact the rubber sealing cover 237, thereby driving the rubber column 244 to slide within the mounting groove 246.

[0055] Please see Figure 10 When the pressure plate 243 rotates inward to contact the rubber sealing cover 237 and fix the rubber sealing cover 237, the movement of the pressure plate 243 will drive the rubber columns 244 and the lever 245 connected to it on both sides to slide together in the mounting groove 246 until the lever 245 is engaged with the fixing groove 248 and then stops. At this time, the pressure plate 243 will contact the rubber sealing cover 237 and support it, which can increase the sealing performance of the rubber sealing cover 237.

[0056] Based on the above embodiments, the method for monitoring the sealing degree of the plug of the sealing joint for cable conduit support is as follows:

[0057] S1, when the cable conduit 1 is in use, by installing the sealing plug 2 to both ends of the cable conduit 1, the cable conduit 1 can be supported and sealed. When the sealing plug 2 is installed, the electric push rod 225 is controlled by the button 3 to rotate. The electric push rod 225 drives the first push rod 31 connected to it to rotate on the main shaft of the mounting base 221 and push it outward.

[0058] S2, through the rotational engagement between the first push rod 31 and the triangular push rod 32, the second push rod 33 and the third push rod 34, it is possible to drive the second push rod 33 and the third push rod 34 to push outward simultaneously when the first push rod 31 pushes outward;

[0059] S3, as the second push rod 33 and the third push rod 34 move, they will drive the connected outer expansion plates 223 to expand outward synchronously, and drive the two sets of sealing rings 226 on the outer expansion plates 223 to extend and retract outward together until they contact the inner wall of the cable conduit 1 and then stop. At this time, as the outer expansion plates 223 expand, they will drive the connected elastic cover 13 to stretch outward together under the action of the outer expansion plates 223, and cooperate with the sealing rings 226 and the blocking plate 227 to seal the inside of the cable conduit 1.

[0060] S4, then turn the knob 232 to drive the screw frame 234 to rotate. The screw frame 234 will drive the several clamping blocks 236 that are in motion with it to move. Under the limiting action of the limiting groove 235, the clamping blocks 236 slide back and forth on the limiting groove 235, and drive the rubber sealing cover 237 connected to it to adjust to wrap and seal the outside of the cable conduit 1, so as to prevent external air and moisture from entering. Then, pry the locking block 233 to engage with several sets of limiting blocks 4 on one side of the base 21, so that the knob 232 will not reverse.

[0061] S5, and press down several pressure plates 243 installed on the support structure 24, so that the pressure plates 243 come into contact with and abut against the rubber sealing cover 237. At this time, as the pressure plates 243 move, they will drive the rubber columns 244 and levers 245 connected on both sides to slide together in the mounting groove 246 until the levers 245 are engaged with the fixing groove 248 and then stop. At this time, the pressure plates 243 will come into contact with the rubber sealing cover 237 and abut against and support it, which can increase the sealing performance of the rubber sealing cover 237.

[0062] S6. Then, through the water pressure test method, the sealed cable conduit 1 is placed inside the water pressure test device, and water medium is filled into the test device until the water level can cover the cable conduit 1.

[0063] S7, and then apply a certain pressure through the water pressure test device to fill the entire test piece with water medium. During the test, observe whether there is any leakage at the sealing plugs at both ends of the cable conduit 1. If water bubbles emerge around the sealing plug 2 and at both ends of the cable conduit 1, it indicates that the seal is not complete. If no water bubbles emerge, it indicates that the sealing plug 2 is complete.

[0064] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0065] The control method of the present invention is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0066] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A sealing joint for cable conduit support, comprising a cable conduit (1), sealing plugs (2) installed at both ends of the cable conduit (1), a button (3) and a limiting block (4) located at one end of the sealing plugs (2); characterized in that: The sealing plug (2) includes a base (21), an inner plug structure (22) installed on the base (21) from the inside to the outside, an outer sealing structure (23) and a support structure (24). The bottom of the outer sealing structure (23) is built into the interior of the base (21), and the support structure (24) is installed on the outer sealing structure (23) with a clearance fit. The inner plug structure (22) includes a mounting base (221), a plurality of telescopic frames (222) arranged on the outside of the mounting base (221), an outer expansion plate (223) mounted on the telescopic rods of the plurality of telescopic frames (222), a linkage mechanism (224) provided at the upper and lower ends of the outer expansion plate (223), an electric push rod (225) located on the main shaft end face of the mounting base (221), a sealing ring (226) provided on the outer wall of the plurality of outer expansion plates (223), and a plug plate (227) fixed to the bottom of the mounting base (221). The linkage mechanism (224) includes a first push rod (31), a triangular push rod (32) rotatably engaged at one end of the first push rod (31), a second push rod (33) rotatably engaged at the second end of the triangular push rod (32), and a third push rod (34) rotatably engaged at the third end of the triangular push rod (32). The other end of the third push rod (34) is rotatably engaged with the outer expansion plate (223). The external sealing structure (23) includes a main frame (231), a screw frame (234) rotatably engaged at the center of the main frame (231), a knob (232) located at the central axis of the screw frame (234), a locking block (233) for rotatably engaging with the knob (232), four limiting grooves (235) arrayed on the main frame (231), a clamping block (236) for slidingly engaging with several of the limiting grooves (235), and a rubber sealing cover (237) fixed to the inner side wall of the clamping block (236). The support structure (24) includes an outer cover (241), a plurality of openings (249) arrayed on the outer cover (241), a rotating shaft (242) located at the bottom of the plurality of openings (249), a pressure plate (243) for rotating with the rotating shaft (242), rubber pillars (244) located on both sides of the pressure plate (243), and a lever (245) fixed to one side of the rubber pillars (244). The rubber pillars (244) and the lever (245) are both built into the mounting groove (246). The mounting groove (246) is opened on the outer cover (241). The mounting groove (246) has a chamfer (247) at the port near the opening (249). One end of the mounting groove (246) has a fixing groove (248). The expansion plate (223) includes a locking post (11), an elastic cover (13) and a telescopic post (14). The bottom of the expansion plate is fixed with a locking post (11), and the bottom of the inner wall of several expansion plates (223) is fixed with an elastic cover (13). A telescopic post (14) is fixed between each two adjacent expansion plates (223), and both ends of the telescopic post (14) are connected to the expansion plate (223). The spiral grooves opened on the spiral frame (234) are gradually converging structures; The diameter of the fixing groove (248) is slightly smaller than the diameter of the lever (245), which can embed and fix the lever (245) so that the rubber column (244) and the pressure plate (243) are fixed.

2. The sealing joint for cable conduit support and sealing according to claim 1, characterized in that: The blocking plate (227) has a plurality of sliding grooves (12) arranged on one side, and the plurality of sliding grooves (12) are slidably engaged with the locking post (11).

3. The sealing joint for cable conduit support and sealing according to claim 2, characterized in that: The locking block (233) can engage with several sets of limiting blocks (4) provided on one side of the base (21), and the limiting blocks (4) can restrict the rotation of the knob (232).

4. A sealing joint for cable conduit support and a method for monitoring the sealing performance of the plug, using the sealing joint for cable conduit support as described in claim 3, wherein the sealing performance monitoring method is as follows: S1, When the cable conduit (1) is in use, by installing the sealing plug (2) to both ends of the cable conduit (1), the cable conduit (1) can be supported and sealed. When the sealing plug (2) is installed, the electric push rod (225) is controlled by the button (3) to operate. The electric push rod (225) drives the first push rod (31) connected to it to rotate on the main shaft of the mounting base (221) and push it outward. S2, through the rotational engagement between the first push rod (31) and the triangular push rod (32), the second push rod (33) and the third push rod (34), can drive the second push rod (33) and the third push rod (34) to push outward simultaneously when the first push rod (31) pushes outward; S3, as the second push rod (33) and the third push rod (34) move, they will drive the connected outer expansion plates (223) to expand outward synchronously, and drive the two sets of sealing rings (226) on the outer expansion plate (223) to extend outward together until they contact the inner wall of the cable conduit (1) and stop. At this time, as the expansion of the outer expansion plates (223) drives the connected elastic cover (13) to stretch outward together under the drive of the outer expansion plate (223), and cooperate with the sealing ring (226) and the blocking plate (227) to seal the inside of the cable conduit (1). S4, then turn the knob (232) to drive the screw frame (234) to rotate. The screw frame (234) will drive the several clamping blocks (236) that are in motion with it to move. Under the limiting action of the limiting groove (235), the clamping blocks (236) slide back and forth on the limiting groove (235) and drive the rubber sealing cover (237) connected to it to adjust to be able to wrap and seal the outside of the cable tube (1) to prevent external air and moisture from entering. Then, pry the locking block (233) to engage with several sets of limiting blocks (4) on one side of the base (21) so that the knob (232) will not reverse. S5, and press down on the several pressure plates (243) installed on the support structure (24) so ​​that the pressure plates (243) come into contact with and abut against the rubber sealing cover (237). At this time, as the pressure plates (243) move, they will drive the rubber columns (244) and levers (245) connected on both sides to slide together in the mounting groove (246) until the levers (245) are engaged with the fixing groove (248) and stop. At this time, the pressure plates (243) will come into contact with the rubber sealing cover (237) and abut against it to support it, which can increase the sealing performance of the rubber sealing cover (237). S6, and then through the water pressure test method, the sealed cable conduit (1) is placed inside the water pressure test device, and water medium is filled into the water pressure test device until the water level can cover the cable conduit (1). S7, and then apply a certain pressure through the water pressure test device to fill the entire test piece with water medium. During the test, observe whether there is any leakage at the sealing plugs at both ends of the cable conduit (1). If water bubbles emerge around the sealing plug (2) and at both ends of the cable conduit (1), it indicates that the seal is incomplete. If no water bubbles emerge, it indicates that the sealing plug (2) is complete.

Images