Mechanical sealing system suitable for underground cable structure

Abstract

The invention discloses a mechanical sealing system suitable for an underground cable structure, which relates to the technical field of underground cables and comprises a cable sealing body, cable sealing heads located at the front end and the rear end of the cable sealing body, assembling mechanisms arranged on the two sides of the cable sealing heads and metal protection mechanisms arranged at the top ends of the cable sealing body and the cable sealing heads. An inflation sealing mechanism is arranged on the upper side of an inner cavity of the cable sealing head, an inflation pump is arranged in the inflation sealing mechanism, an adjusting groove is formed in the surface of the front end of the cable sealing head, and the assembling mechanism comprises a first assembling plate located on the surface of one side of the cable sealing head and a second assembling plate located on the surface of the other side of the cable sealing head. By arranging the assembling mechanism, the flexible planning function is improved; by arranging a metal protection mechanism and a damage alarm, the functions of preliminary protection and timely maintenance are achieved; and the annular grooves and the tree-shaped grooves are formed, so that the multi-layer-depth sealing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable systems, and in particular to a mechanical sealing system suitable for underground cable structures. Background Art

[0002] Nowadays, various electrical equipment and machinery in society are inseparable from power supply and signal control. Therefore, the power system requires a lot of power data transmission, and cables are often needed. Cables can be used to maintain the power system for information transmission and facilitate the control of the instrument system. Underground cables are power cables laid underground. Nowadays, the underground environment is complex and cables are easily corroded and damaged. Therefore, underground cable sealing systems are needed for protection.

[0003] In the process of using the existing underground cable sealing system, with the expansion and renewal of the city, it is often necessary to adjust the cable layout to meet the needs of the new plan, especially the underground cable sealing system sealed by fixing and cement irrigation, which will cause the problem of difficulty in adding and adjusting the position of the cable sealing structure, resulting in the old cable layout being affected by urban planning changes; another problem is that underground cables are more affected by environmental factors. Due to the complexity of the underground environment, while the soil or moisture changes, they are also easily affected by excavation operations in construction projects. If accurate position detection is not carried out in advance, the underground cables can easily be damaged. After the cable protection system is destroyed by artificial excavation, underground biological drilling and soil corrosion, the service life of the cable will be reduced and signal transmission will be affected. Therefore, it is necessary to improve the protection and detection function of the cable protection system. Summary of the Invention

[0004] The object of the present invention is to provide a mechanical sealing system suitable for underground cable structures to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a mechanical sealing system suitable for underground cable structures, comprising a cable sealing body, a cable sealing head located at the front and rear ends of the cable sealing body, an assembly mechanism arranged on both sides of the cable sealing head, and a metal protection mechanism arranged on the top of the cable sealing body and the cable sealing head. An inflatable sealing mechanism is arranged on the upper side of the inner cavity of the cable sealing head, an air pump is arranged inside the inflatable sealing mechanism, an adjustment groove is provided on the front end surface of the cable sealing head, the assembly mechanism comprises 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 card slot is provided in the upper and lower middle position of the first assembly plate, a second micro pole is provided at the upper and lower ends of the second assembly plate, an assembly buckle plate is provided at the movable end of the second micro pole, and the two opposite assembly buckle plates are clamped with the card slot.

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

[0007] Preferably, an anti-corrosion air bag is provided below the air pump, an underground cable body is plugged into the inner wall of the anti-corrosion air bag, and the inflation sealing mechanism and the top of the cable sealing head are fixedly installed through a mounting plate.

[0008] Preferably, first micro poles are arranged opposite to each other inside the cable sealing heads on both sides of the adjustment groove, one end of the first micro pole extending to the adjustment groove is provided with a first semicircular sealing plate, and the other end of the first micro pole extending to the adjustment groove is provided with a second semicircular sealing plate.

[0009] Preferably, the first semicircular sealing plate and the second semicircular sealing plate are both semicircular in shape, and the inner ring side walls of the first semicircular sealing plate and the second semicircular sealing plate are both provided with annular grooves, and there are a plurality of annular grooves arranged at equal intervals.

[0010] Preferably, a hydraulic cylinder is provided inside the second semicircular sealing plate, a pressure plate is provided at the movable end of the hydraulic cylinder, a waterproof mortar chamber is provided on the side of the pressure plate away from the hydraulic cylinder, an electric control valve is provided at the end of the waterproof gelling chamber away from the pressure plate, and a tree-shaped groove is provided between the electric control valve and the multiple annular grooves.

[0011] Preferably, a mounting seat 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 seat, an insertion rod is provided at the front end of the electric push rod, a slide groove is opened behind the first assembly plate, and the insertion rod is plugged into the slide groove.

[0012] Preferably, guide plates are provided at both the front and rear ends of the assembly gusset plate, the cross-section of the assembly gusset plate is an inverted L-shape, and guide grooves are provided on 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 protective 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 one end of the first right-angle protective net close to the second right-angle protective net, and a second assembly groove is provided at one end of the second right-angle protective net close to the first right-angle protective net, the first assembly block is clamped with the second assembly groove, and the tops of the first right-angle protective net and the second right-angle protective net are both penetrated by limiting perforations, and the inner diameter of the limiting perforations matches the outer diameter of the limiting column.

[0014] Preferably, a first assembly groove is provided at the lower end of the first right-angle protective net and the second right-angle protective net, an extended 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 extended protective net, the first assembly groove is connected to the second assembly block, a third assembly groove is provided at the bottom end of the extended protective net, and a damaged alarm is provided inside the first right-angle protective net.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This mechanical sealing system is suitable for underground cable structures. By setting an assembly mechanism, a limit groove and a limit column, when the layout is adjusted due to changes in the power system, a cable is added to bring the first assembly plate of a cable sealing head close to the second assembly plate of another cable sealing head, so that the assembly buckle plate is inserted into the slot, and then the second micro-electric pole is used to drive the assembly buckle plates close to each other, so that the assembly buckle plates are clamped on the first assembly plate, and after assembly, the insertion rod is inserted into the slide groove by an electric push rod for limiting, thereby further improving the stability of the assembly. The upper and lower assembly is carried out by inserting the limit column of the lower cable sealing head into the limit groove of the upper cable sealing head for position limitation. Therefore, flexible assembly and change of multiple cable sealing heads and cable sealing bodies can be realized, avoiding the problem of large-scale repairs caused by partial asynchrony between the new cable layout and the old cable layout, and improving the flexible planning function and adjustability of the equipment.

[0016] 2. This mechanical sealing system for underground cable structures is equipped with a metal protective mechanism. After the layout of the mechanical sealing system of the underground cable structure is completed, the three sides of the underground cable structure are protected by the metal protective mechanism to form a protective cover, and the bottom surface is provided with a cement layer to provide stability and support. When the system equipment with the protective cover is used, the first right-angle protective net and the second right-angle protective net are snap-connected and assembled. When it is adjusted horizontally, a new extended protective net can be added thereto. In the vertical direction, an appropriate amount of extended protective net can also be added according to the planned cable layout to achieve a highly applicable protective net effect and area.

[0017] 3. This mechanical sealing system suitable for underground cable structures is equipped with a waterproof putty chamber, an annular groove and a tree-shaped groove. When sealing the cable sealing head of the cable sealing system, the first semicircular sealing plate and the second semicircular sealing plate are first brought close to each other through the first micro-pole to achieve the fitting protection function of the underground cable body. Then the electric control valve is opened, and the waterproof putty in the waterproof putty chamber is pushed into the tree-shaped groove through the hydraulic cylinder and the pressure plate, so that each branch in the tree-shaped groove has waterproof putty output, and the waterproof putty of each branch is connected and transported into each corresponding annular groove, so that each annular groove is sealed with waterproof putty, achieving a multi-layer three-dimensional deep sealing effect.

[0018] 4. This mechanical sealing system for underground cable structures is equipped with a first right-angle protection net and a damaged alarm. After the sealing system of the underground cable structure is damaged, the cable is more likely to be damaged. Therefore, before the cable sealing body and the cable sealing head are damaged, if the metal protection mechanism is damaged, the damaged alarm will be triggered to alarm and prompt, thereby achieving the function of timely reminder for maintenance and inspection, and can also accurately and efficiently improve the target location of maintenance and inspection. Therefore, the damaged underground cable sealing system can be maintained more quickly and efficiently, further improving the service life of the cable and the stable transmission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front 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 A magnified view of the structure of the middle part A; Figure 4 It is a top sectional view of the overall structure of the present invention; Figure 5 This is a three-dimensional assembly diagram of the assembled gusset plate structure of the present invention; Figure 6 This is a three-dimensional exploded view of the semicircular sealing plate of the present invention; Figure 7 For the present invention Figure 4 A magnified view of the structure of the middle B section; Figure 8 It is a partial three-dimensional exploded view of the metal protection mechanism of the present invention.

[0020] In the figure: 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 column; 23. Adjustment groove; 41. Inflatable pump; 42. Anti-corrosion airbag; 43. Mounting plate; 61. First right-angle protection net; 62. Second right-angle protection net; 63. Extended protection net; 64. Damage alarm; 211. First miniature pole; 212. First semicircular sealing plate; 213. Second semicircular sealing plate; 214. Annular groove; 215. Tree-shaped groove; 216. Hydraulic cylinder; 217. Pressing plate; 218. Waterproofing putty chamber; 219. Electric control valve; 311. First assembly plate; 312. Mounting seat; 313. Electric push rod; 314. Inserting rod; 315. Slide groove; 316. Card slot; 321. Second assembly plate; 322. Second micro pole; 323. Assembly buckle plate; 324. Guide plate; 325. Guide slot; 611. First assembly block; 612. First assembly slot; 613. Position limiting perforation; 621. Second assembly slot; 631. Second assembly block; 632. Third assembly slot. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present 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 the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] like Figures 1 to 8As shown, this embodiment is suitable for a mechanical sealing system of an underground cable structure, comprising a cable sealing body 1, a cable sealing head 2 located at the front and rear ends of the cable sealing body 1, an assembly mechanism 3 arranged on both sides of the cable sealing head 2, and a metal protection mechanism 6 arranged on the top of the cable sealing body 1 and the cable sealing head 2. An inflatable sealing mechanism 4 is provided on the upper side of the inner cavity of the cable sealing head 2, an inflatable sealing mechanism 4 is provided inside the inflatable sealing mechanism 4, an inflatable pump 41 is provided inside the inflatable sealing mechanism 4, and a mobile power supply is attached thereto. An anti-corrosion air bag 42 is provided below the inflatable pump 41, and an underground cable main body 5 is plugged into the inner wall of the anti-corrosion air bag 42. The inflatable sealing mechanism 4 is fixedly installed to the top of the cable sealing head 2 by a mounting piece 43. The second layer of protection effect of the underground cable main body 5 is achieved by inflatable sealing, and more air in the sealed environment can be discharged to reduce oxidation; an adjustment groove 23 is provided on the front end surface of the cable sealing head 2, and a first micro The pole 211, a first micro pole 211 extending to one end of the adjustment groove 23 is provided with a first semicircular sealing plate 212, and another first micro pole 211 extending to one end of the adjustment groove 23 is provided with a second semicircular sealing plate 213, and the sealing end point of the underground cable body 5 is wrapped by the two semicircular sealing plates to achieve preliminary protection; 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, and a card slot 316 is opened in the middle position of the first assembly plate 311 relative to each other, and a second micro pole 322 is provided at the upper and lower ends of the second assembly plate 321, and an assembly buckle plate 323 is provided at the movable end of the second micro pole 322. The two opposite assembly buckle plates 323 are mutually engaged with the card slot 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, limiting grooves 21 are provided at the four corners of the bottom end of the cable sealing head 2, and limiting columns 22 are provided at the four corners of the top end of the cable sealing head 2. When the upper and lower ends of the two cable sealing heads 2 are in contact, the limiting grooves 21 and the limiting columns 22 are plugged into each other, and the function of precise positioning is achieved through the limiting grooves 21 and the limiting columns 22 spliced ​​together.

[0026] Furthermore, the first semicircular sealing plate 212 and the second semicircular sealing plate 213 are both semicircular, and the inner ring side walls of the first semicircular sealing plate 212 and the second semicircular sealing plate 213 are both provided with an annular groove 214, and the annular grooves 214 are provided with a plurality of them and are arranged at equal distances. A hydraulic cylinder 216 is provided inside the second semicircular sealing plate 213, and a pressure plate 217 is provided at the movable end of the hydraulic cylinder 216, and a waterproof putty is provided on the side of the pressure plate 217 away from the hydraulic cylinder 216. Chamber 218, an electric-controlled valve 219 is provided at one end of the waterproof cementing chamber away from the pressure plate 217, and a tree-shaped groove 215 is provided between the electric-controlled valve 219 and the multiple annular grooves 214. The waterproof putty in the waterproof putty chamber 218 is pushed into the tree-shaped groove 215 by the hydraulic cylinder 216 and the pressure plate 217. The waterproof putty of each branch is connected and transported into each annular groove 214, so that each annular groove 214 is sealed with the waterproof putty, achieving a multi-layer depth sealing effect.

[0027] Furthermore, a mounting seat 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 seat 312, and an insertion rod 314 is provided at the front end of the electric push rod 313. A slide groove 315 is provided at the rear of the first assembly plate 311, and the insertion rod 314 is plugged into the slide groove 315. Guide plates 324 are provided at the front and rear ends of the assembly buckle plate 323, and the cross-section of the assembly buckle plate 323 is an inverted L-shape. Guide grooves 325 are provided on the front and rear surfaces of the inner wall of the second assembly plate 321, and the guide plates 324 are slidably connected with the guide grooves 325. The second micro-pole 322 drives the assembly buckle plate 323 to move up and down, and at the same time, it is stably guided by the guide plate 324 and the guide groove 325 to achieve an efficient and fast assembly effect. After the insertion rod 314 is inserted into the gap, the movement of the assembly buckle plate 323 is avoided, and the fixation is strengthened to realize the stability function after assembly.

[0028] Furthermore, the metal protective 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 one end of the first right-angle protective net 61 close to the second right-angle protective net 62, and a second assembly groove 621 is provided at one end of the second right-angle protective net 62 close to the first right-angle protective net 61. The first assembly block 611 is clamped with the second assembly groove 621. A limiting perforation 613 is provided through the top of the first right-angle protective net 61 and the second right-angle protective net 62, and the inner diameter size of the limiting perforation 613 matches the outer diameter size of the limiting column 22. The limiting perforation 613 is conveniently put on the limiting column 22 to achieve a precise, stable and convenient assembly effect of the first right-angle protective net 61 and the second right-angle protective net 62.

[0029] Furthermore, a first assembly groove 612 is provided at the lower end of the first right-angle protective net 61 and the second right-angle protective net 62, an extended 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 extended protective net 63, the first assembly groove 612 is engaged with the second assembly block 631, and a third assembly groove 632 is provided at the bottom of the extended protective net 63. The extended 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 adapts to different numbers of cable sealing heads 2. Similarly, different numbers of extended protective nets 63 can also be added in the vertical direction to achieve the effect of adapting to different heights; a damaged alarm 64 is provided inside the first right-angle protective net 61, which is equipped with a mobile power supply. When the protective net is damaged, an alarm prompt is issued in time so that maintenance and inspection personnel can perform maintenance and inspection on the damaged parts in time.

[0030] The method of using this embodiment is as follows: when using the mechanical sealing system, first protect the underground cable body 5 in the inner cavity of the cable sealing body 1 and the cable sealing head 2, and then control the first semicircular sealing plate 212 and the second semicircular sealing plate 213 to approach each other through the first micro-pole 211 to achieve the fitting function of the underground cable body 5, and then open the electric control valve 219, and push the waterproof putty in the waterproof putty chamber 218 into the tree-shaped groove 215 through the hydraulic cylinder 216 and the pressure plate 217, and transport the waterproof putty into each corresponding annular groove 214 through the branch opening in the tree-shaped groove 215, so that each annular groove 214 is sealed with the waterproof putty, 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 The first assembly plate 311 of the head 2 is close to the second assembly plate 321 of the other cable sealing head 2, so that the assembly buckle plate 323 is inserted into the card slot 316, and then the second micro-electric pole 322 drives the assembly buckle plate 323 to approach each other, so that the assembly buckle plate 323 is carded on the first assembly plate 311, and after assembly, the electric push rod 313 is used to insert the insertion rod 314 into the slide groove 315 for limiting the position. Due to the stability of the structure, the upper and lower assembly only requires the limiting column 22 of the lower cable sealing head 2 to be inserted 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 damaged alarm 64 will alarm and prompt, promptly notify the maintenance personnel to perform maintenance and inspection, and provide the target position for maintenance and inspection.

[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 aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalent features for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A mechanical sealing system suitable for underground cable structures, comprising a cable sealing body (1), a cable sealing head (2) located at the front and rear ends of the cable sealing body (1), an assembly mechanism (3) provided on both sides of the cable sealing head (2), and a metal protection mechanism (6) provided at the top of the cable sealing body (1) and the cable sealing head (2), characterized in that: An inflatable sealing mechanism (4) is provided on the upper side of the inner cavity of the cable sealing head (2), an inflatable pump (41) is provided inside the inflatable sealing mechanism (4), an adjustment groove (23) is provided on the front end surface of the cable sealing head (2), the assembly mechanism (3) comprises 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 clamping groove (316) is provided in the middle position of the first assembly plate (311) in the upper and lower directions, a second micro-pole (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 micro-pole (322), and the two opposite assembly buckle plates (323) are clamped with the clamping groove (316) to each other.

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

3. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: An anti-corrosion air bag (42) is provided below the air pump (41), an underground cable body (5) is plugged into the inner wall of the anti-corrosion air bag (42), and the air sealing mechanism (4) and the top end of the cable sealing head (2) are fixedly mounted via a mounting plate (43).

4. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: First micro-poles (211) are arranged opposite to each other inside the cable sealing heads (2) on both sides of the adjustment groove (23); one end of the first micro-poles (211) extending to the adjustment groove (23) is provided with a first semicircular sealing plate (212); and the other end of the first micro-poles (211) extending to the adjustment groove (23) is provided with a second semicircular sealing plate (213).

5. The mechanical sealing system for underground cable structures according to claim 4, characterized in that: The first semicircular sealing plate (212) and the second semicircular sealing plate (213) are both semicircular in shape, and the inner ring side walls of the first semicircular sealing plate (212) and the second semicircular sealing plate (213) are both provided with an annular groove (214), and the annular grooves (214) are provided in a plurality and are arranged at equal intervals.

6. The mechanical sealing system for underground cable structures according to claim 5, characterized in that: A hydraulic cylinder (216) is provided inside the second semicircular sealing plate (213), a pressing plate (217) is provided at the movable end of the hydraulic cylinder (216), a waterproof cement chamber (218) is provided on the side of the pressing plate (217) away from the hydraulic cylinder (216), an electric control valve (219) is provided at one end of the waterproof cement chamber away from the pressing plate (217), and a tree-shaped groove (215) is provided between the electric control valve (219) and the plurality of annular grooves (214).

7. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: A mounting seat (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 seat (312), an insertion rod (314) is provided at the front end of the electric push rod (313), a sliding groove (315) is provided at the rear of the first assembly plate (311), and the insertion rod (314) is plugged into the sliding groove (315).

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

9. The mechanical sealing system for underground cable structures according to claim 1, characterized in that: The metal protection mechanism (6) comprises a first right-angle protection net (61) and a second right-angle protection net (62) at the top of the cable sealing head (2), wherein the cross-sections of the first right-angle protection net (61) and the second right-angle protection net (62) are both L-shaped, a first assembly block (611) is provided at one end of the first right-angle protection net (61) close to the second right-angle protection net (62), and a second assembly groove (621) is provided at one end of the second right-angle protection net (62) close to the first right-angle protection net (61), the first assembly block (611) and the second assembly groove (621) are engaged, and the tops of the first right-angle protection net (61) and the second right-angle protection net (62) are both penetrated by a limiting perforation (613), and the inner diameter of the limiting perforation (613) matches the outer diameter of the limiting column (22).

10. The mechanical sealing system for underground cable structures according to claim 9, characterized in that: The lower ends of the first right-angle protection net (61) and the second right-angle protection net (62) are both provided with a first assembly slot (612), an extension protection net (63) is provided below the first right-angle protection net (61) and the second right-angle protection net (62), a second assembly block (631) is provided at the top of the extension protection 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 protection net (63), and a damage alarm (64) is provided inside the first right-angle protection net (61).

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