Medium-voltage fireproof power cable

Abstract

The invention provides a medium-voltage fireproof power cable, and relates to the technical field of cables. The fireproof mechanism is fixedly mounted on the surface of the cable main body; the inner side of the fireproof outer skin is fixedly connected with the fireproof mechanism; the rotation control mechanism is installed on the surface of the fireproof outer skin. The top of the auxiliary suspension mechanism is connected with the rotation control mechanism; the top of the limiting device is connected with the rotation control mechanism, and the metal fireproof plate in the device shrinks and can be folded and bent, so that a cable is convenient to carry; in case of a fire, the metal fireproof plate is automatically unfolded, so that the fireproof effect of the cable is greatly improved; the pull rope extends and clings to the surface of the cable, so that folding and carrying of the cable are not affected; the pull rope has a bearing effect, so that the cable can be fixedly mounted without a bearing frame, and the mounting is simple and convenient; the problem that a traditional fireproof material still has the possibility of combustion is solved; and during fixation, a supporting piece is needed for auxiliary supporting, so that the installation is troublesome and the carrying is troublesome.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly relates to a medium-voltage fireproof power cable. Background Art

[0002] Medium-voltage cables refer to power cables with a rated voltage between 1 kV and 35 kV, which are used for power transmission and distribution under medium current or medium voltage levels; in the power system, medium-voltage cables are important links connecting substations and distribution networks, playing an important role in energy transmission and signal transmission; generally, fireproof materials are wrapped outside medium-voltage cables, and this part of the materials has a certain flame retardant effect. However, the cable may still catch fire and burn because the fire-starting and burning time is relatively long; some medium-voltage cables need to be installed inside factories or buildings. Since the cables are generally circular in structure, support members are required to assist in supporting during fixation. The number of support members is large, and it is troublesome to take, carry, install, and fix them. Summary of the Invention

[0003] An embodiment of the present disclosure relates to a medium-voltage fireproof power cable, which has a fireproof mechanism. When the inflatable support bag expands, two metal fireproof plates contract together. The area between multiple groups of metal fireproof plates is in a relatively soft state, which can be folded and bent, facilitating the handling of the cable; when the inflatable support bag is broken, the support effect ends, and the two metal fireproof plates automatically unfold, greatly enhancing the fireproof effect of the cable; an auxiliary suspension mechanism and a limiting device, the pull rope extends and clings to the surface of the cable. During daily handling, this part of the pull rope will not affect the folding and handling of the cable, and can also provide a certain degree of protection for the cable; by passing screws through the auxiliary fixing jacks and inserting and fixing them on the wall, the cable can be fixed and installed without a support bracket, and the installation is simple and convenient.

[0004] In a first aspect of the present disclosure, a medium-voltage fireproof power cable is provided, which specifically includes: a cable main body, a fireproof mechanism, a fireproof outer skin, a rotation control mechanism, an auxiliary suspension mechanism, and a limiting device; The cable main body is in an overall round tubular structure; the fireproof mechanism is fixedly installed on the surface of the cable main body; the inner side of the fireproof outer skin is fixedly connected to the fireproof mechanism; the rotation control mechanism is installed on the surface of the fireproof outer skin; the top of the auxiliary suspension mechanism is connected to the rotation control mechanism; the top of the limiting device is connected to the rotation control mechanism.

[0005] In at least some embodiments, the fireproof mechanism includes: a top fixing ring A, an inflatable support assembly, a bottom fixing ring, and a telescopic protection assembly; the top fixing ring A is in a circular ring structure and is fixedly installed on the surface of the cable main body; the top of the inflatable support assembly is connected to the top fixing ring A; the bottom fixing ring is fixedly installed on the surface of the cable main body, and the inner side of the fireproof outer skin is fixedly connected to the top fixing ring A and the bottom fixing ring; the top of the telescopic protection assembly is connected to the inflatable support assembly.

[0006] In at least some embodiments, the inflatable support assembly further includes: a guiding frame, a control drawstring, and an inflatable support bag; the guiding frame is an internally hollow U-shaped structure as a whole, and the guiding frame is fixedly installed on the top of the top fixing ring A; one end of the top of the control drawstring slides through the guiding frame and the top fixing ring A; the inflatable support bag is a circular ring structure as a whole, one end of the top of the inflatable support bag is fixedly connected to the top fixing ring A, and one end of the bottom of the control drawstring is inserted into the interior of the inflatable support bag, and the inflatable support bag can pull the control drawstring to slide after being inflated.

[0007] In at least some embodiments, the telescopic protection assembly further includes: a fixed metal retaining ring, an inner sliding ring, an elastic pulling ring, and a fixing ring; the fixed metal retaining ring is a circular ring structure as a whole, and one end of the top of the fixed metal retaining ring is fixedly connected to the top fixing ring A; the inner sliding ring is slidably installed inside the fixed metal retaining ring, and the top of the inner sliding ring is fixedly connected to the other end of the control drawstring, and the fixed metal retaining ring and the inner sliding ring can achieve a good fire protection effect; the elastic pulling ring is a circular ring structure as a whole, and the top of the elastic pulling ring is fixedly connected to the inner sliding ring, and the elastic pulling ring can play a role in elastically pulling the inner sliding ring to slide; the fixing ring is a circular ring structure with a groove opened at the top, one end of the bottom of the elastic pulling ring is fixedly inserted into the interior of the fixing ring, and the bottom of the fixing ring is fixedly connected to the bottom fixing ring.

[0008] In at least some embodiments, the rotation control mechanism includes: a top fixing ring B, a slot, a connecting chute, an auxiliary insertion ring, and a control outer ring; the top fixing ring B is fixedly installed on the surface of the fireproof outer skin; the slot is opened inside the top fixing ring B; the connecting chute is opened on the surface of the top fixing ring B; the auxiliary insertion ring is slidably inserted into the connecting chute on the surface of the top fixing ring B; the inner side of the control outer ring is fixedly connected to the auxiliary insertion ring, and the control outer ring is rotationally connected to the top fixing ring B through the auxiliary insertion ring.

[0009] In at least some embodiments, the auxiliary suspension mechanism includes: a drawstring A, a connecting plate, a connecting rotating rod, an auxiliary fixing jack, and a bottom sliding ring; one end of the top of the drawstring A is fixedly connected to the top fixing ring B; the connecting plate is a cuboid structure, and one side of the connecting plate is fixedly connected to the drawstring A; the connecting rotating rod is a cylindrical structure, and the upper and lower ends of the connecting rotating rod are rotatably connected to two groups of connecting plates; the auxiliary fixing jack is opened in the middle of the connecting rotating rod, and the auxiliary fixing jack can assist in fixedly installing the cable at a high place; the bottom sliding ring is slidably installed on the surface of the fireproof outer skin, and the top of the bottom sliding ring is fixedly connected to the bottom of the drawstring A.

[0010] In at least some embodiments, the limiting device includes: a sliding rod, a limiting card hole, a retaining ring, and a limiting release assembly; the top of the sliding rod slides through the inner slot of the top fixing ring B, and the bottom of the sliding rod is fixedly connected to the bottom sliding ring; the number of limiting card holes is set to two groups, and the limiting card holes are opened on the surface of the sliding rod; the number of retaining rings is set to two groups, and the retaining rings are fixedly installed on the surface of the sliding rod, and the retaining rings can play a role in assisting to limit the sliding position of the sliding rod; one end of the limiting release assembly is fixedly connected to the top fixing ring B, and the other end of the limiting release assembly is connected to the control outer ring.

[0011] In at least some embodiments, the limiting release assembly further includes: a fixed column, a spring, a baffle, a limiting insertion rod, a pull rope B, and a driving block; the fixed column is a hollow cylindrical structure, and the fixed column is fixedly connected to the top fixing ring B; the spring is installed inside the fixed column, and the spring can play a role in elastically squeezing the limiting insertion rod; the baffle is slidably installed inside the fixed column and contacts the spring; one end of the limiting insertion rod slides into the fixed column and is fixedly connected to the baffle, and when the limiting insertion rod is inserted into the limiting card hole, it can play a role in limiting the sliding rod; one end of the pull rope B slides into the fixed column and is fixedly connected to the baffle; the driving block is fixedly installed on the inner side of the control outer ring, and the pull rope B and the driving block can play a role in pulling the limiting insertion rod to slide.

[0012] The present invention has the following beneficial effects First, a fire prevention mechanism is provided inside the present invention. When the inflatable support bag inside the fire prevention mechanism is in an inflated state, at this time, the inflatable support bag controls the two metal fire baffle plates to contract together through the control pull rope. The area between multiple groups of metal fire baffle plates is in a relatively soft state, and the cable can be folded and bent to a certain extent, which is convenient for cable handling.

[0013] Second, when the inflatable support bag inside the fire prevention mechanism encounters a fire, the surface of the inflatable support bag is burned through, and the support effect ends. The inflatable support bag is pulled by the elastic pull ring and contracts and deforms, and the two metal fire baffle plates automatically unfold. The metal fire baffle plates are made of metal, which greatly increases the fire prevention effect of the cable.

[0014] Third, an auxiliary suspension mechanism and a limiting device are also provided inside the present device. The limiting device can control the pull rope inside the auxiliary suspension mechanism to extend and closely adhere to the surface of the cable. During daily handling, this part of the pull rope will not affect the folding handling of the cable and can also play a certain protective effect on the cable.

[0015] Finally, when the pull rope inside the present invention contracts and bulges in the middle, the staff can pass a screw through the auxiliary fixing jack and insert and fix it on the wall. The pull rope can play a role in assisting in supporting and fixing, and the cable can be fixedly installed without a support bracket, and the installation is simple and convenient. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0017] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0018] In the accompanying drawings: Figure 1 A schematic structural diagram of the main body of the present invention is shown in a side view; Figure 2 A schematic structural diagram of the main body of the present invention is shown in a front view; Figure 3 A schematic sectional view of the fire prevention mechanism of the present invention is shown; Figure 4 A schematic sectional view of the inflatable support assembly of the present invention is shown; Figure 5 A schematic exploded view of the telescopic protection assembly of the present invention is shown; Figure 6 A schematic sectional view of the rotation control mechanism of the present invention is shown; Figure 7 A schematic side view of the auxiliary suspension mechanism of the present invention is shown; Figure 8 A schematic sectional view of the limiting device of the present invention is shown; Figure 9 A schematic sectional view of the limit release assembly of the present invention is shown.

[0019] List of reference numerals 1. Cable main body; 2. Fire prevention mechanism; 201. Top fixing ring A; 202. Inflatable support assembly; 2021. Guide frame; 2022. Control pull rope; 2023. Inflatable support bag; 203. Bottom fixing ring; 204. Telescopic protection assembly; 2041. Fixed metal retaining ring; 2042. Inner sliding ring; 2043. Elastic pull ring; 2044. Fixed ring; 3. Fireproof outer skin; 4. Rotation control mechanism; 401. Top fixing ring B; 402. Slot; 403. Connection chute; 404. Auxiliary insertion ring; 405. Control outer ring; 5. Auxiliary suspension mechanism; 501. Pull rope A; 502. Connecting plate; 503. Connecting rotating rod; 504. Auxiliary fixing jack; 505. Bottom sliding ring; 6. Limiting device; 601. Sliding rod; 602. Limiting card hole; 603. Retaining ring; 604. Limit release assembly; 6041. Fixed column; 6042. Spring; 6043. Baffle; 6044. Limit insertion rod; 6045. Pull rope B; 6046. Driving block. Detailed implementation manners

[0020] The following further describes the implementation manners of the present invention in detail in conjunction with the accompanying drawings and embodiments.

[0021] Embodiment: Please refer to Figures 1 to 9 : The present invention provides a medium-voltage fireproof power cable, comprising: a cable main body 1, a fireproof mechanism 2, a fireproof outer skin 3, a rotation control mechanism 4, an auxiliary suspension mechanism 5 and a limiting device 6; The cable main body 1 is integrally a circular tubular structure; the fireproof mechanism 2 is fixedly installed on the surface of the cable main body 1; the inner side of the fireproof outer skin 3 is fixedly connected to the fireproof mechanism 2; the rotation control mechanism 4 is installed on the surface of the fireproof outer skin 3; the top of the auxiliary suspension mechanism 5 is connected to the rotation control mechanism 4; the top of the limiting device 6 is connected to the rotation control mechanism 4.

[0022] As Figure 3 shown, the fireproof mechanism 2 includes: a top fixing ring A201, an inflatable support assembly 202, a bottom fixing ring 203 and a telescopic protection assembly 204; the top fixing ring A201 is a circular ring structure, and the top fixing ring A201 is fixedly installed on the surface of the cable main body 1; the top of the inflatable support assembly 202 is connected to the top fixing ring A201; the bottom fixing ring 203 is fixedly installed on the surface of the cable main body 1, and the inner side of the fireproof outer skin 3 is fixedly connected to the top fixing ring A201 and the bottom fixing ring 203; the top of the telescopic protection assembly 204 is connected to the inflatable support assembly 202.

[0023] As Figure 4 shown, the inflatable support assembly 202 further includes: a guiding frame 2021, a control pull rope 2022 and an inflatable support bag 2023; the guiding frame 2021 is integrally a U-shaped structure with a hollow interior, and the guiding frame 2021 is fixedly installed on the top of the top fixing ring A201; one end of the top of the control pull rope 2022 slides through the guiding frame 2021 and the top fixing ring A201; the inflatable support bag 2023 is integrally a circular ring structure, one end of the top of the inflatable support bag 2023 is fixedly connected to the top fixing ring A201, and one end of the bottom of the control pull rope 2022 is inserted into the interior of the inflatable support bag 2023, and the inflatable support bag 2023 can play a role in pulling the control pull rope 2022 to slide after being inflated.

[0024] As Figure 5As shown in the figure, the telescopic protection component 204 further includes: a fixed metal retaining ring 2041, an inner sliding ring 2042, an elastic pull ring 2043, and a fixed ring 2044; the fixed metal retaining ring 2041 is in a circular ring structure, and one end of the top of the fixed metal retaining ring 2041 is fixedly connected to the top fixing ring A201; the inner sliding ring 2042 is slidably installed inside the fixed metal retaining ring 2041, and the top of the inner sliding ring 2042 is fixedly connected to the other end of the control pull rope 2022. The fixed metal retaining ring 2041 and the inner sliding ring 2042 can achieve a good fire prevention effect; the elastic pull ring 2043 is in a circular ring structure, and the top of the elastic pull ring 2043 is fixedly connected to the inner sliding ring 2042. The elastic pull ring 2043 can play a role in elastically pulling the inner sliding ring 2042 to slide; the fixed ring 2044 is in a circular ring structure with a groove opened at the top. One end of the bottom of the elastic pull ring 2043 is fixedly inserted into the inside of the fixed ring 2044, and the bottom of the fixed ring 2044 is fixedly connected to the bottom fixing ring 203.

[0025] As Figure 6 shown in the figure, the rotation control mechanism 4 includes: a top fixing ring B401, a slot 402, a connecting chute 403, an auxiliary insertion ring 404, and a control outer ring 405; the top fixing ring B401 is fixedly installed on the surface of the fireproof outer skin 3; the slot 402 is opened inside the top fixing ring B401; the connecting chute 403 is opened on the surface of the top fixing ring B401; the auxiliary insertion ring 404 is slidably inserted into the inside of the connecting chute 403 on the surface of the top fixing ring B401; the inner side of the control outer ring 405 is fixedly connected to the auxiliary insertion ring 404, and the control outer ring 405 is rotatably connected to the top fixing ring B401 through the auxiliary insertion ring 404.

[0026] As Figure 7 shown in the figure, the auxiliary suspension mechanism 5 includes: a pull rope A501, a connecting plate 502, a connecting rotating rod 503, an auxiliary fixing jack 504, and a bottom sliding ring 505; one end of the top of the pull rope A501 is fixedly connected to the top fixing ring B401; the connecting plate 502 is in a cuboid structure, and one side of the connecting plate 502 is fixedly connected to the pull rope A501; the connecting rotating rod 503 is in a cylindrical structure, and the upper and lower ends of the connecting rotating rod 503 are rotatably connected to two groups of connecting plates 502; the auxiliary fixing jack 504 is opened in the middle of the connecting rotating rod 503, and the auxiliary fixing jack 504 can assist in the fixed installation of the cable at a high place; the bottom sliding ring 505 is slidably installed on the surface of the fireproof outer skin 3, and the top of the bottom sliding ring 505 is fixedly connected to the bottom of the pull rope A501.

[0027] As Figure 8As shown, the limit device 6 includes: a sliding rod 601, a limit card hole 602, a retaining ring 603, and a limit release component 604; the top of the sliding rod 601 slides through the inner slot 402 of the top fixing ring B401, and the bottom of the sliding rod 601 is fixedly connected to the bottom sliding ring 505; the number of the limit card holes 602 is set to two groups, and the limit card holes 602 are opened on the surface of the sliding rod 601; the number of the retaining rings 603 is set to two groups, and the retaining rings 603 are fixedly installed on the surface of the sliding rod 601, and the retaining rings 603 can play a role in assisting to limit the sliding position of the sliding rod 601; one end of the limit release component 604 is fixedly connected to the top fixing ring B401, and the other end of the limit release component 604 is connected to the control outer ring 405.

[0028] As Figure 9 As shown, the limit release component 604 further includes: a fixing column 6041, a spring 6042, a baffle 6043, a limit insertion rod 6044, a pull rope B6045, and a driving block 6046; the fixing column 6041 is a cylindrical structure with a hollow interior, and the fixing column 6041 is fixedly connected to the top fixing ring B401; the spring 6042 is installed inside the fixing column 6041, and the spring 6042 can play a role in elastically squeezing the limit insertion rod 6044; the baffle 6043 is slidably installed inside the fixing column 6041 and is in contact with the spring 6042; one end of the limit insertion rod 6044 slides into the inside of the fixing column 6041 and is fixedly connected to the baffle 6043, and when the limit insertion rod 6044 is inserted into the limit card hole 602, it can play a role in limiting the sliding rod 601; one end of the pull rope B6045 slides into the inside of the fixing column 6041 and is fixedly connected to the baffle 6043; the driving block 6046 is fixedly installed on the inner side of the control outer ring 405, and the pull rope B6045 and the driving block 6046 can play a role in pulling the limit insertion rod 6044 to slide.

[0029] Specific usage method and function of this embodiment: Since the inflatable support bag 2023 is filled with gas inside, the inflatable support bag 2023 expands. The inflatable support bag 2023 forms a traction force on the inner sliding ring 2042 through the control drawstring 2022. The bottom of the inner sliding ring 2042 is connected to the elastic drawring 2043. The elastic drawring 2043 is stretched under force. At this time, the fixed metal retaining ring 2041 and the inner sliding ring 2042 contract together, and the inner sliding ring 2042 extends out. The area between multiple fixed metal retaining rings 2041 is in a relatively soft state, and the entire cable can be bent and stored to a certain extent; when a fire occurs at a certain point in the cable route, the flame lasts for a long time and burns through the fireproof outer skin 3. The flame contacts the inflatable support bag 2023 inside. The surface of the inflatable support bag 2023 is burned through, and the gas inside the inflatable support bag 2023 leaks. The inflatable support bag 2023 contracts, and the elastic drawring 2043 rebounds and pulls the inner sliding ring 2042 out of the fixed metal retaining ring 2041. The fixed metal retaining ring 2041 and the inner sliding ring 2042 expand, and the fireproof area increases. The fireproof effect of the metal material is better; when installing the cable, the control outer ring 405 can be rotated. The control outer ring 405 drives the drawstring B 6045 to slide through the driving block 6046 inside. The other end of the drawstring B 6045 slides into the spring 6042 and is fixedly connected to the limit insertion rod 6044. The drawstring B 6045 pulls the limit insertion rod 6044 to contract into the fixed column 6041. The limit insertion rod 6044 is withdrawn from the limit card hole 602, and the limit is released. The sliding rod 601 can slide. The sliding rod 601 is pushed to slide through the bottom sliding ring 505. Limited by the retaining ring 603 on the surface of the sliding rod 601, another set of limit card holes 602 on the surface of the sliding rod 601 slide below the limit insertion rod 6044, releasing the pulling of the limit insertion rod 6044. The limit insertion rod 6044 is inserted back into the limit card hole 602 to complete re-limiting. Due to the sliding of the position of the bottom sliding ring 505, the middle of the drawstring A 501 can bulge outwards at this time. The staff can pass a nail through the auxiliary fixing jack 504 on the surface of the connecting rotating rod 503 and fix it on the wall or other positions to complete the fixing of the cable.

[0030] In this article, the following points need to be noted: 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure. Other structures can refer to the general design.

[0031] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0032] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A medium voltage fireproof power cable, comprising: Cable body (1), fireproof mechanism (2), fireproof outer skin (3), rotation control mechanism (4), auxiliary suspension mechanism (5) and limit device (6); The cable body (1) is a circular tubular structure as a whole; it is characterized in that the fire protection mechanism (2) is fixedly mounted on the surface of the cable body (1); the inner side of the fire protection outer skin (3) is fixedly connected to the fire protection mechanism (2); the rotation control mechanism (4) is mounted on the surface of the fire protection outer skin (3); the top of the auxiliary suspension mechanism (5) is connected to the rotation control mechanism (4); and the top of the limit device (6) is connected to the rotation control mechanism (4).

2. A medium voltage fireproof power cable according to claim 1, characterized in that: The fire protection mechanism (2) comprises: a top fixing ring A (201), an inflatable support assembly (202), a bottom fixing ring (203) and a telescopic protection assembly (204); the top fixing ring A (201) is a circular ring structure, and the top fixing ring A (201) is fixedly mounted on the surface of the cable body (1); the top of the inflatable support assembly (202) is connected to the top fixing ring A (201); the bottom fixing ring (203) is fixedly mounted on the surface of the cable body (1), and the inner side of the fire protection outer skin (3) is fixedly connected to the top fixing ring A (201) and the bottom fixing ring (203); and the top of the telescopic protection assembly (204) is connected to the inflatable support assembly (202).

3. A medium voltage fireproof power cable according to claim 2, characterized in that: The inflatable support assembly (202) further comprises: a guide frame (2021), a control pull rope (2022) and an inflatable support bag (2023); the guide frame (2021) is a U-shaped structure with a hollow interior, and the guide frame (2021) is fixedly mounted on the top of the top fixing ring A (201); the top end of the control pull rope (2022) slides through the guide frame (2021) and the top fixing ring A (201); the inflatable support bag (2023) is a circular ring structure, the top end of the inflatable support bag (2023) is fixedly connected to the top fixing ring A (201), and the bottom end of the control pull rope (2022) is inserted into the inflatable support bag (2023).

4. A medium voltage fireproof power cable according to claim 2, characterized in that: The telescopic protection assembly (204) further comprises: a fixed metal baffle ring (2041), an inner sliding ring (2042), an elastic pull ring (2043) and a fixed ring (2044); the fixed metal baffle ring (2041) is a circular ring-shaped structure, and one end of the top of the fixed metal baffle ring (2041) is fixedly connected to the top fixed ring A (201); the inner sliding ring (2042) is slidably mounted on the inner side of the fixed metal baffle ring (2041), and the top of the inner sliding ring (2042) is fixedly connected to the other end of the control pull rope (222); the elastic pull ring (2043) is a circular ring-shaped structure, and the top of the elastic pull ring (2043) is fixedly connected to the inner sliding ring (2042); the fixed ring (2044) is a circular ring-shaped structure with a groove on the top, and one end of the bottom of the elastic pull ring (2043) is fixedly inserted into the interior of the fixed ring (2044), and the bottom of the fixed ring (2044) is fixedly connected to the bottom fixed ring (203).

5. A medium voltage fireproof power cable according to claim 1, characterized in that: The rotation control mechanism (4) comprises: a top fixing ring B (401), a slot (402), a connecting slide groove (403), an auxiliary insert ring (404) and a control outer ring (405); the top fixing ring B (401) is fixedly mounted on the surface of the fireproof outer skin (3); the slot (402) is arranged on the inner side of the top fixing ring B (401); the connecting slide groove (403) is arranged on the surface of the top fixing ring B (401); the auxiliary insert ring (404) is slidably inserted into the interior of the connecting slide groove (403) on the surface of the top fixing ring B (401); the inner side of the control outer ring (405) is fixedly connected to the auxiliary insert ring (404), and the control outer ring (405) is rotationally connected to the top fixing ring B (401) via the auxiliary insert ring (404).

6. A medium voltage fireproof power cable according to claim 5, characterized in that: The auxiliary suspension mechanism (5) comprises: a pull rope A (501), a connecting plate (502), a connecting rotating rod (503), an auxiliary fixing socket (504) and a bottom slip ring (505); the top end of the pull rope A (501) is fixedly connected to the top fixing ring B (401); the connecting plate (502) is a rectangular parallelepiped structure, and one side of the connecting plate (502) is fixedly connected to the pull rope A (501); the connecting rotating rod (503) is a cylindrical structure, and the upper and lower ends of the connecting rotating rod (503) are rotatably connected to the two groups of connecting plates (502); the auxiliary fixing socket (504) is provided in the middle of the connecting rotating rod (503); and the bottom slip ring (505) is slidably mounted on the surface of the fireproof outer skin (3), and the top of the bottom slip ring (505) is fixedly connected to the bottom of the pull rope A (501).

7. A medium voltage fireproof power cable according to claim 5, characterized in that: The limiting device (6) comprises: a sliding rod (601), a limiting clamping hole (602), a retaining ring (603) and a limiting release assembly (604); the top of the sliding rod (601) slides through the inner slot (402) of the top fixing ring B (401), and the bottom of the sliding rod (601) is fixedly connected to the bottom sliding ring (505); the limiting clamping holes (602) are arranged in two groups, and the limiting clamping holes (602) are opened on the surface of the sliding rod (601); the retaining ring (603) is arranged in two groups, and the retaining ring (603) is fixedly installed on the surface of the sliding rod (601); one end of the limiting release assembly (604) is fixedly connected to the top fixing ring B (401), and the other end of the limiting release assembly (604) is connected to the control outer ring (405).

8. A medium voltage fireproof power cable according to claim 7, characterized in that: The limit release assembly (604) further comprises: a fixed column (6041), a spring (6042), a baffle (6043), a limit plug rod (6044), a pull rope B (6045), and a driving block (6046); the fixed column (6041) is a cylindrical structure with a hollow interior, and the fixed column (6041) is fixedly connected to the top fixing ring B (401); the spring (6042) is installed inside the fixed column (6041); the baffle (6043) is slidably installed inside the fixed column (6041) The limiting rod (6044) is inserted into the fixed column (6041) and is fixedly connected to the baffle (6043). The limiting rod (6044) is inserted into the limiting clamp hole (602) to limit the sliding rod (601). The pull rope B (6045) is inserted into the fixed column (6041) and is fixedly connected to the baffle (6043). The driving block (6046) is fixedly mounted on the inner side of the control outer ring (405).

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