A mechanical sealing system suitable for use in underground cable constructions

Abstract

The application discloses a mechanical sealing system suitable for an underground cable structure and relates to the technical field of underground cables, which comprises a cable sealing body, cable sealing heads arranged at the front and back ends of the cable sealing body, an assembling mechanism arranged on the two sides of the cable sealing heads, and a metal protection mechanism arranged at the top end of the cable sealing body and the cable sealing heads, an inflation sealing mechanism is arranged on the upper side of the inner cavity of the cable sealing head, an inflation pump is arranged in the inflation sealing mechanism, an adjusting groove is formed in the front end surface of the cable sealing head, and the assembling mechanism comprises a first assembling plate arranged on the surface of one side of the cable sealing head and a second assembling plate arranged on the surface of the other side of the cable sealing head. The application has the advantages that the flexible planning function is improved by arranging the assembling mechanism, the functions of preliminary protection and timely maintenance are achieved by arranging the metal protection mechanism and the damaged alarm, and the sealing effect of multiple layers and depths is realized by arranging the annular groove and the tree-shaped groove.

Description

Technical Field

[0001] This invention relates to the field of cable system technology, specifically a mechanical sealing system suitable for underground cable structures. Background Technology

[0002] In today's society, various electrical equipment and machinery cannot function without power supply and signal control. Therefore, power systems require a lot of power data transmission, which often necessitates the use of cables. Cables can be used to maintain the power system, transmit information, and facilitate the control of instrument systems. Underground cables are power cables laid underground. Nowadays, the underground environment is complex and easily corrodes and damages cables. Therefore, underground cable sealing systems are needed for protection.

[0003] In the use of existing underground cable sealing systems, with the expansion and renewal of cities, it is often necessary to adjust the cable layout to adapt to the needs of new plans. In particular, underground cable sealing systems that are fixed and sealed by cement grouting can cause problems with the difficulty in adding and adjusting the position of cable sealing structures, resulting in the old cable layout being affected by changes in urban planning. Another problem is that underground cables are greatly affected by environmental factors. Due to the complexity of the underground environment, changes in soil or moisture are not only unavoidable, but also easily affected by excavation operations during construction projects. If accurate location detection is not carried out in advance, underground cables can easily be damaged. After manual excavation, underground biological drilling, and soil corrosion damage the cable protection system, the cable's service life will be reduced and signal transmission will be affected. Therefore, it is necessary to improve the protection and detection functions of the cable protection system. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical sealing system suitable for underground cable structures to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mechanical sealing system suitable for underground cable structures, comprising a cable sealing body, cable sealing heads located at the front and rear ends of the cable sealing body, assembly mechanisms arranged on both sides of the cable sealing heads, and a metal protective mechanism arranged at the top of the cable sealing body and the cable sealing heads. An inflation sealing mechanism is provided on the upper side of the inner cavity of the cable sealing head, and an inflation pump is provided inside the inflation sealing mechanism. An adjustment groove is provided on the front surface of the cable sealing head. The assembly mechanism includes a first assembly plate located on one side surface of the cable sealing head and a second assembly plate located on the other side surface of the cable sealing head. A slot is provided vertically oppositely in the middle of the first assembly plate. A second miniature electric rod is provided at both the upper and lower ends of the second assembly plate. An assembly buckle is provided at the movable end of the second miniature electric rod. The two opposing assembly buckles are engaged with the slots.

[0006] Preferably, the bottom four corners of the cable sealing head are provided with limiting grooves, and the top four corners of the cable sealing head are provided with limiting posts. When the upper and lower ends of the two cable sealing heads are in contact, the limiting grooves and limiting posts are inserted into each other.

[0007] Preferably, an anti-corrosion airbag is provided below the air pump, and the underground cable body is inserted into the inner wall of the anti-corrosion airbag. The inflation sealing mechanism is fixedly installed to the top of the cable sealing head by a mounting plate.

[0008] Preferably, the cable sealing heads on both sides of the adjustment groove are provided with first miniature electric rods facing each other inside, one of the first miniature electric rods is provided with a first semi-circular sealing plate at one end extending into the adjustment groove, and the other first miniature electric rod is provided with a second semi-circular sealing plate at one end extending into the adjustment groove.

[0009] Preferably, both the first semicircular sealing plate and the second semicircular sealing plate are semicircular rings, and the inner ring sidewalls of both the first semicircular sealing plate and the second semicircular sealing plate are provided with annular grooves. There are a plurality of annular grooves arranged at equal intervals.

[0010] Preferably, a hydraulic cylinder is provided inside the second semi-circular sealing plate, a pressure plate is provided at the movable end of the hydraulic cylinder, a waterproof sealant chamber is provided on the side of the pressure plate away from the hydraulic cylinder, an electrically controlled valve is provided at the end of the waterproof sealant chamber away from the pressure plate, and a tree-shaped groove is provided together between the electrically controlled valve and multiple annular grooves.

[0011] Preferably, a mounting base is provided on the side wall of the cable sealing body behind the first assembly plate, an electric push rod is provided at the front end of the mounting base, an insertion rod is provided at the front end of the electric push rod, and a sliding groove is provided behind the first assembly plate, with the insertion rod inserted into the sliding groove.

[0012] Preferably, guide plates are provided at both the front and rear ends of the assembly plate, the cross-section of the assembly plate is an inverted L-shape, and guide grooves are provided on both the front and rear surfaces of the inner wall of the second assembly plate, and the guide plates are slidably connected to the guide grooves.

[0013] Preferably, the metal protection mechanism includes a first right-angle protective net and a second right-angle protective net at the top of the cable sealing head. The cross-sections of the first right-angle protective net and the second right-angle protective net are both L-shaped. A first assembly block is provided at the end of the first right-angle protective net near the second right-angle protective net, and a second assembly groove is provided at the end of the second right-angle protective net near the first right-angle protective net. The first assembly block and the second assembly groove are engaged. Limiting holes are provided through the tops of both the first right-angle protective net and the second right-angle protective net, and the inner diameter of the limiting hole matches the outer diameter of the limiting post.

[0014] Preferably, the lower ends of the first right-angle protective net and the second right-angle protective net are provided with a first assembly slot, an extension protective net is provided below the first right-angle protective net and the second right-angle protective net, a second assembly block is provided at the top of the extension protective net, the first assembly slot is engaged with the second assembly block, a third assembly slot is provided at the bottom of the extension protective net, and a damage alarm is provided inside the first right-angle protective net.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This mechanical sealing system, applicable to underground cable structures, utilizes an assembly mechanism, limiting grooves, and limiting posts. When adjusting the layout due to changes in the power system, adding cables brings the first assembly plate of one cable sealing head close to the second assembly plate of another cable sealing head, allowing the assembly buckle to insert into the slot. Then, a second miniature electric rod drives the assembly buckles closer together, securing them to the first assembly plate. After assembly, an electric push rod inserts a pin into a sliding groove for positioning, further improving assembly stability. For vertical assembly, the limiting post of the lower cable sealing head is inserted into the limiting groove of the upper cable sealing head for position determination. Therefore, flexible assembly and modification of multiple cable sealing heads and cable sealing bodies are possible, avoiding large-scale modifications caused by localized asynchrony between new and old cable layouts, and improving the equipment's flexible planning function and adjustability.

[0016] 2. This mechanical sealing system, applicable to underground cable structures, uses a metal protective mechanism to protect three sides of the underground cable structure after the system layout is completed, forming a protective cover. The bottom surface is provided with a cement layer for stability and support. When the system equipment with the protective cover is in use, the first and second right-angle protective nets are snapped together. When the system is adjusted laterally, new extension protective nets can be added. Similarly, in the vertical direction, an appropriate amount of extension protective nets can be added according to the planned cable layout, achieving a highly applicable protective net effect and area.

[0017] 3. This mechanical sealing system, applicable to underground cable structures, utilizes a waterproof sealant chamber, annular grooves, and tree-shaped grooves. When sealing the cable sealing head, the first semi-circular sealing plate and the second semi-circular sealing plate are brought close together by a first miniature electric rod, achieving a protective fit against the underground cable body. Then, the electrically controlled valve is opened, and a hydraulic cylinder and pressure plate push the waterproof sealant from the waterproof sealant chamber into the tree-shaped grooves. This ensures that each branch of the tree-shaped groove outputs waterproof sealant, and the sealant from each branch is connected and transported into the corresponding annular grooves, sealing each annular groove with waterproof sealant and achieving a multi-layered, three-dimensional deep sealing effect.

[0018] 4. This mechanical sealing system, applicable to underground cable structures, incorporates a first right-angle protective net and a damage alarm. Since the cable is more susceptible to damage after the sealing system is compromised, the damage alarm will be triggered before the cable seal and cable head are damaged. This timely reminder for maintenance and repair is achieved, and the target location for maintenance and repair is accurately and efficiently identified. Therefore, it enables faster and more efficient maintenance of the damaged underground cable sealing system, further improving the cable's service life and stable transmission performance. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the overall structure of the present invention; Figure 2 This is a perspective view of the cable sealing head structure of the present invention; Figure 3 For the present invention Figure 1 Enlarged view of the structure of section A in the middle; Figure 4 This is a top sectional view of the overall structure of the present invention; Figure 5 This is a three-dimensional assembly diagram of the assembly buckle structure of the present invention; Figure 6 This is an exploded perspective view of the semi-circular sealing plate of the present invention; Figure 7 For the present invention Figure 4 Enlarged view of the structure of section B in the middle; Figure 8 This is a partial exploded perspective view of the metal protective mechanism of the present invention.

[0020] In the diagram: 1. Cable sealing body; 2. Cable sealing head; 3. Assembly mechanism; 4. Inflatable sealing mechanism; 5. Underground cable body; 6. Metal protection mechanism; 21. Limiting groove; 22. Limiting post; 23. Adjusting groove; 41. Inflating pump; 42. Corrosion-resistant airbag; 43. Mounting plate; 61. First right-angle protective net; 62. Second right-angle protective net; 63. Extended protective net; 64. Damage alarm; 211. First miniature pole; 212. First semi-circular sealing plate; 213. Second semi-circular sealing plate; 214. Annular groove; 215. Tree-shaped groove; 216. Hydraulic cylinder; 217. Pressure plate; 218. Waterproof putty chamber; 219. Electrically controlled valve; 311. First assembly plate; 312. Mounting base; 313. Electric push rod; 314. Insert rod; 315. Slide groove; 316. Slot; 321. Second assembly plate; 322. Second miniature electric pole; 323. Assembly buckle plate; 324. Guide plate; 325. Guide groove; 611. First assembly block; 612. First assembly slot; 613. Limiting perforation; 621. Second assembly slot; 631. Second assembly block; 632. Third assembly slot. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] like Figures 1 to 8As shown, this embodiment is applicable to a mechanical sealing system for underground cable structures, including a cable sealing body 1, cable sealing heads 2 located at the front and rear ends of the cable sealing body 1, assembly mechanisms 3 arranged on both sides of the cable sealing heads 2, and metal protective mechanisms 6 arranged at the top of the cable sealing body 1 and the cable sealing heads 2. An inflation sealing mechanism 4 is arranged on the upper side of the inner cavity of the cable sealing head 2. An inflation pump 41 is arranged inside the inflation sealing mechanism 4, with a portable power supply inside. An anti-corrosion airbag 42 is arranged below the inflation pump 41. The underground cable body 5 is inserted into the inner wall of the anti-corrosion airbag 42. The inflation sealing mechanism 4 and the top of the cable sealing head 2 are fixedly installed by mounting pieces 43. The inflation sealing achieves a second layer of protection for the underground cable body 5 and can expel more air from the sealed environment, reducing oxidation. An adjustment groove 23 is opened on the front surface of the cable sealing head 2. A first micro-shaped structure is arranged opposite to the cable sealing head 2 on both sides of the adjustment groove 23. The pole 211 has a first semi-circular sealing plate 212 at one end extending to the adjustment groove 23, and a second semi-circular sealing plate 213 at the other end extending to the adjustment groove 23. The two semi-circular sealing plates wrap the sealing end of the underground cable body 5 to achieve initial protection. The assembly mechanism 3 includes a first assembly plate 311 on one side of the cable sealing head 2 and a second assembly plate 321 on the other side of the cable sealing head 2. The first assembly plate 311 has a slot 316 with opposite sides at the middle position inside. The second assembly plate 321 has a second miniature pole 322 at both the upper and lower ends. The movable end of the second miniature pole 322 is provided with an assembly buckle plate 323. The two opposite assembly buckles 323 are engaged with the slots 316 to realize the left and right splicing of the cable sealing head 2, flexibly change the cable layout, and facilitate the efficient assembly function of adding new nodes to the system.

[0025] Specifically, the bottom four corners of the cable sealing head 2 are provided with limiting grooves 21, and the top four corners of the cable sealing head 2 are provided with limiting posts 22. When the upper and lower ends of the two cable sealing heads 2 are in contact, the limiting grooves 21 and the limiting posts 22 are inserted into each other. The function of precise positioning is achieved by the upper and lower spliced ​​limiting grooves 21 and limiting posts 22.

[0026] Furthermore, both the first semicircular sealing plate 212 and the second semicircular sealing plate 213 are semicircular rings. The inner ring sidewalls of both the first semicircular sealing plate 212 and the second semicircular sealing plate 213 are provided with annular grooves 214. Several annular grooves 214 are provided and arranged at equal intervals. A hydraulic cylinder 216 is installed inside the second semicircular sealing plate 213. A pressure plate 217 is provided at the movable end of the hydraulic cylinder 216. Waterproof sealant is provided on the side of the pressure plate 217 away from the hydraulic cylinder 216. In chamber 218, an electrically controlled valve 219 is installed at the end of the waterproof cementing chamber away from the pressure plate 217. The electrically controlled valve 219 and multiple annular grooves 214 are connected to form a tree-shaped groove 215. The waterproof cement in the waterproof cement chamber 218 is pushed into the tree-shaped groove 215 by the hydraulic cylinder 216 and the pressure plate 217. The waterproof cement at each branch is connected and transported into each annular groove 214, so that each annular groove 214 is sealed by the waterproof cement, achieving a multi-layer deep sealing effect.

[0027] Furthermore, a mounting base 312 is provided on the side wall of the cable sealing body 1 behind the first assembly plate 311. An electric push rod 313 is provided at the front end of the mounting base 312, and an insertion rod 314 is provided at the front end of the electric push rod 313. A sliding groove 315 is provided behind the first assembly plate 311, and the insertion rod 314 is inserted into the sliding groove 315. Guide plates 324 are provided at both ends of the assembly buckle plate 323. The cross-section of the assembly buckle plate 323 is an inverted L-shape. Guide grooves 325 are provided on both the front and rear surfaces of the inner wall of the second assembly plate 321. The guide plates 324 are slidably connected to the guide grooves 325. The second miniature electric rod 322 drives the assembly buckle plate 323 to move up and down. At the same time, the guide plates 324 and the guide grooves 325 provide stable guidance, achieving a highly efficient and rapid assembly effect. After the insertion rod 314 is inserted into the gap, the movement of the assembly buckle plate 323 is prevented, and the assembly is strengthened and fixed to achieve a stable function after assembly.

[0028] Furthermore, the metal protection mechanism 6 includes a first right-angle protective net 61 and a second right-angle protective net 62 at the top of the cable sealing head 2. The cross-sections of the first right-angle protective net 61 and the second right-angle protective net 62 are both L-shaped. A first assembly block 611 is provided at the end of the first right-angle protective net 61 near the second right-angle protective net 62, and a second assembly groove 621 is provided at the end of the second right-angle protective net 62 near the first right-angle protective net 61. The first assembly block 611 and the second assembly groove 621 are engaged. A limiting hole 613 is provided through the top of both the first right-angle protective net 61 and the second right-angle protective net 62. The inner diameter of the limiting hole 613 matches the outer diameter of the limiting post 22. The limiting hole 613 can be easily fitted onto the limiting post 22 to achieve a precise, stable, and convenient assembly effect for the first right-angle protective net 61 and the second right-angle protective net 62.

[0029] Furthermore, the lower ends of the first right-angle protective net 61 and the second right-angle protective net 62 are both provided with first assembly slots 612. An extension protective net 63 is provided below the first right-angle protective net 61 and the second right-angle protective net 62. A second assembly block 631 is provided at the top of the extension protective net 63. The first assembly slot 612 and the second assembly block 631 are engaged. A third assembly slot 632 is provided at the bottom of the extension protective net 63. The extension protective net 63 between the first right-angle protective net 61 and the second right-angle protective net 62 can provide an assembly protection effect that can accommodate different numbers of cable sealing heads 2. Similarly, different numbers of extension protective nets 63 can be added vertically to accommodate different heights. The first right-angle protective net 61 is equipped with a damage alarm 64 with a portable power supply. When the protective net is damaged, it will promptly issue an alarm to enable maintenance and repair personnel to maintain and repair the damaged parts in a timely manner.

[0030] The usage method of this embodiment is as follows: When using the mechanical sealing system, the underground cable body 5 is first protected in the inner cavity of the cable sealing body 1 and the cable sealing head 2. Then, the first semi-circular sealing plate 212 and the second semi-circular sealing plate 213 are brought closer together by the first miniature electric rod 211 to achieve the function of fitting the underground cable body 5. Then, the electric control valve 219 is opened, and the waterproof sealant in the waterproof sealant chamber 218 is pushed into the tree-shaped groove 215 by the hydraulic cylinder 216 and the pressure plate 217. The waterproof sealant is delivered into each corresponding annular groove 214 through the branch in the tree-shaped groove 215, so that each annular groove 214 is sealed by the waterproof sealant, achieving the purpose of multi-layer depth sealing. When it is necessary to adjust the power system and change the cable layout, a new underground cable body 5 is added, and the cable seal of the added cable can be improved. The first assembly plate 311 of the first cable sealing head 2 is close to the second assembly plate 321 of the other cable sealing head 2, so that the assembly buckle 323 is inserted into the slot 316. Then, the second miniature electric rod 322 drives the assembly buckle 323 to move closer to each other, so that the assembly buckle 323 is snapped onto the first assembly plate 311. After assembly, the electric push rod 313 inserts the plug rod 314 into the slide groove 315 for limiting. For the upper and lower assembly, due to the stability of the structure, it is only necessary to insert the limiting post 22 of the lower cable sealing head 2 into the limiting groove 21 of the upper cable sealing head 2 to limit the position. When the cable sealing system is damaged and affects the metal protection mechanism 6, the damage alarm 64 will sound an alarm and prompt, promptly notify the maintenance personnel to carry out maintenance and repair, and provide the target location for maintenance and repair.

[0031] Finally, it should be noted that the above descriptions are merely 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, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical sealing system suitable for underground cable structures, comprising a cable sealing body (1), cable sealing heads (2) located at the front and rear ends of the cable sealing body (1), assembly mechanisms (3) arranged on both sides of the cable sealing heads (2), and metal protective mechanisms (6) arranged at the top of the cable sealing body (1) and the cable sealing heads (2), characterized in that: An inflation sealing mechanism (4) is provided on the upper side of the inner cavity of the cable sealing head (2). An inflation pump (41) is provided inside the inflation sealing mechanism (4). An adjustment groove (23) is provided on the front surface of the cable sealing head (2). The assembly mechanism (3) includes a first assembly plate (311) located on one side surface of the cable sealing head (2) and a second assembly plate (321) located on the other side surface of the cable sealing head (2). A slot (316) is provided in the middle of the first assembly plate (311) with the upper and lower sides facing each other. A second miniature electric rod (322) is provided at both the upper and lower ends of the second assembly plate (321). An assembly buckle plate (323) is provided at the movable end of the second miniature electric rod (322). The two opposing assembly buckles (323) are engaged with the slots (316). Inside the cable sealing heads (2) on both sides of the adjustment groove (23), there are first miniature electric rods (211) arranged opposite each other. One of the first miniature electric rods (211) extends to one end of the adjustment groove (23) and is provided with a first semi-circular sealing plate (212). The other first miniature electric rod (211) extends to one end of the adjustment groove (23) and is provided with a second semi-circular sealing plate (213). The side wall of the cable sealing body (1) behind the first assembly plate (311) is provided with a mounting seat (312). The front end of the mounting seat (312) is provided with an electric push rod (313). The front end of the electric push rod (313) is provided with an insertion rod (314). A sliding groove (315) is opened behind the first assembly plate (311). The insertion rod (314) is inserted into the sliding groove (315).

2. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: The bottom four corners of the cable sealing head (2) are provided with limiting grooves (21), and the top four corners of the cable sealing head (2) are provided with limiting posts (22). When the upper and lower ends of the two cable sealing heads (2) are in contact, the limiting grooves (21) and the limiting posts (22) are inserted.

3. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: The air pump (41) is provided with an anti-corrosion airbag (42) below it. The underground cable body (5) is inserted into the inner wall of the anti-corrosion airbag (42). The air-filled sealing mechanism (4) is fixedly installed with the top of the cable sealing head (2) by the mounting plate (43).

4. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: Both the first semicircular sealing plate (212) and the second semicircular sealing plate (213) are semicircular rings. The inner ring sidewalls of the first semicircular sealing plate (212) and the second semicircular sealing plate (213) are provided with annular grooves (214). There are a number of annular grooves (214) and they are arranged at equal intervals.

5. The mechanical sealing system for underground cable structures according to claim 4, characterized in that: The second semi-circular sealing plate (213) is equipped with a hydraulic cylinder (216). The movable end of the hydraulic cylinder (216) is equipped with a pressure plate (217). A waterproof sealant chamber (218) is provided on the side of the pressure plate (217) away from the hydraulic cylinder (216). An electric control valve (219) is provided on the end of the waterproof sealant chamber (218) away from the pressure plate (217). A tree-shaped groove (215) is provided between the electric control valve (219) and multiple annular grooves (214).

6. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: The assembly buckle (323) is provided with guide plates (324) at both the front and rear ends. The cross-section of the assembly buckle (323) is an inverted L-shape. The inner wall of the second assembly plate (321) is provided with guide grooves (325) on both the front and rear surfaces. The guide plates (324) are slidably connected to the guide grooves (325).

7. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: The metal protection mechanism (6) includes a first right-angle protective net (61) and a second right-angle protective net (62) located at the top of the cable sealing head (2). The cross-sections of the first right-angle protective net (61) and the second right-angle protective net (62) are both L-shaped. The first right-angle protective net (61) is provided with a first assembly block (611) at one end near the second right-angle protective net (62), and the second right-angle protective net (62) is provided with a second assembly groove (621) at one end near the first right-angle protective net (61). The first assembly block (611) and the second assembly groove (621) are engaged. The top ends of the first right-angle protective net (61) and the second right-angle protective net (62) are both provided with a limiting hole (613), and the inner diameter of the limiting hole (613) matches the outer diameter of the limiting post (22).

8. The mechanical sealing system for underground cable structures according to claim 7, characterized in that: The first right-angle protective net (61) and the second right-angle protective net (62) are each provided with a first assembly slot (612) at their lower ends. An extension protective net (63) is provided below the first right-angle protective net (61) and the second right-angle protective net (62). A second assembly block (631) is provided at the top of the extension protective net (63). The first assembly slot (612) is engaged with the second assembly block (631). A third assembly slot (632) is provided at the bottom of the extension protective net (63). A damage alarm (64) is provided inside the first right-angle protective net (61).

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