A power cable protection device

Abstract

The present invention relates to the technical field of power cables, and discloses a power cable protection device, which includes a protection sleeve, two locking structures, and a clamp assembly. The two locking structures are respectively installed at the axial ends of the protection sleeve, and the clamp assembly is tightly sleeved at the axial middle of the protection sleeve; the protection sleeve is made of a flexible material and includes two arc-shaped protection pieces that are snap-connected; the locking structure includes a main housing, an upper cover plate, and a locking block. The main housing and the upper cover plate are detachably connected. There is a through groove between the main housing and the upper cover plate, and the main housing, the upper cover plate and the two arc-shaped protection pieces are radially clamped and matched; the locking block is movably installed in the main housing and is arranged to move obliquely upward along the direction in which the power cable exits the locking structure. An elastic member is also provided between the locking block and the main housing; the locking block is provided with a first tooth portion, and the upper cover plate is provided with a second tooth portion. The first tooth portion and the second tooth portion are used for radial extrusion cooperation with the insulating layer of the power cable to generate a backward stopping effect on the power cable.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and particularly to a power cable protection device. Background Art

[0002] With the rapid development of China's economic level, power security is an important cornerstone for ensuring national life and industrial production. Power cables are cables used for transmitting and distributing electric energy. Whether they are overhead wires or underground lines, long-term operation will cause the aging and damage of the insulation layer.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN217406103U and the authorization announcement date of September 9, 2022 discloses a line protection structure for power transmission and distribution, which specifically includes a wire. A protection device is provided on the arc surface of the wire. The protection device includes two arc plates, the two arc plates are fixedly connected to the wire, a rotating roller is rotatably connected inside the two arc plates, a spring is sleeved on the arc surface of the rotating roller, and both ends of the spring are fixedly connected to the two arc plates. One end of the two arc plates is fixedly connected with an additional block, a first bolt is threadedly connected inside the additional block, one end of the first bolt is rotatably connected with a pressing block, the pressing block is slidably connected with the additional block, and a pressing column is slidably connected inside the additional block.

[0004] The existing line protection structure for power transmission and distribution fixes the protection device to the wire by driving a protection pad to press the wire through a pressing column, thereby protecting the insulation layer of the wire. However, the force-bearing contact area between the pressing column and the wire is small, the protection device is prone to slip and displace, and it is impossible to effectively strengthen the protection of the local part of the wire, and it cannot be flexibly bent and deformed according to actual needs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the force-bearing contact area between the pressing column of the existing line protection structure for power transmission and distribution and the wire is small, the protection device is prone to slip and displace, and it is impossible to effectively strengthen the protection of the local part of the wire, and it cannot be flexibly bent and deformed according to actual needs.

[0006] In order to solve the above technical problems, the present invention provides a technical solution for a power cable protection device:

[0007] The power cable protection device includes a protection sleeve, two locking structures, and a clamp assembly. The two locking structures are respectively installed at the axial ends of the protection sleeve, and the clamp assembly is tightly sleeved at the axial middle of the protection sleeve;

[0008] The protection sleeve is made of a flexible material and includes two arc-shaped protection pieces. The two arc-shaped protection pieces are snap-connected to form a protection channel for the power cable to pass through, and the arc-shaped protection pieces are used for wrapping and cooperating with the insulation layer of the power cable;

[0009] The locking structure includes a main housing, an upper cover plate, and a locking block. The main housing is detachably connected to the upper cover plate. A through groove communicating with the protection channel is provided between the main housing and the upper cover plate, and the main housing, the upper cover plate, and the two arc-shaped protection pieces are radially clamped and matched;

[0010] The locking block is movably installed in the main housing, and is arranged to move obliquely upward along the direction in which the power cable exits the locking structure. An elastic member is further provided between the locking block and the main housing;

[0011] A first tooth portion is provided on one side of the locking block close to the upper cover plate, and a second tooth portion is provided on one side of the upper cover plate close to the main housing. The first tooth portion and the second tooth portion are used for radially squeezing and matching with the insulating layer of the power cable to produce a backward stopping effect on the power cable.

[0012] Further, the structures of the first tooth portion and the second tooth portion are the same. The first tooth portion includes a plurality of helical teeth arranged in sequence along the axial direction. The helical teeth have a backward stopping surface and a guiding surface. The backward stopping surface is parallel to the radial plane of the through groove, and the guiding surface extends obliquely downward along the direction in which the power cable exits the locking structure. The backward stopping surface and the guiding surface intersect to form a squeezing end.

[0013] Further, a guiding groove is provided on the inner side wall of the main housing, and the guiding groove extends obliquely upward along the direction in which the power cable exits the locking structure. Sliding blocks are provided on both sides of the locking block, and the two sliding blocks are respectively slidably matched with the corresponding guiding grooves.

[0014] Further, the locking structure further includes a sliding seat. The sliding seat is movably installed in the main housing. The locking block and the sliding seat are movably sleeved and matched. The elastic member is a cylindrical compression spring installed between the locking block and the sliding seat.

[0015] Further, a lower ear plate is provided at the end of the main housing, and an upper ear plate is provided at the end of the upper cover plate. The upper ear plate and the lower ear plate are buckled up and down and are wrapped and connected with the protection sleeve; first convex portions are provided on the inner sides of the lower ear plate and the upper ear plate, and a first hole is opened at the end of the arc-shaped protection piece. The first convex portion is inserted and matched with the first hole.

[0016] Further, the clamp assembly includes a first C-shaped clamp and a second C-shaped clamp. The first C-shaped clamp is installed with its opening facing downward on the outer sides of the two arc-shaped protection pieces, and the second C-shaped clamp is installed with its opening facing upward on the outer side of the first C-shaped clamp;

[0017] The inner sides of the first C-shaped clamp and the second C-shaped clamp are both provided with second convex parts. The arc-shaped protective sheet is provided with a second hole, and the second convex part is inserted and matched with the second hole.

[0018] Further, a plurality of first convex ribs are provided on the outer side of the first C-shaped clamp. The length direction of the first convex ribs is arranged parallel to the axial direction, and the protruding direction of the first convex ribs extends obliquely outwards along the direction away from the opening of the first C-shaped clamp.

[0019] A plurality of second convex ribs are provided on the inner side of the second C-shaped clamp. The length direction of the second convex ribs is arranged parallel to the axial direction, and the protruding direction of the second convex ribs extends obliquely inwards along the direction away from the opening of the second C-shaped clamp. The first convex ribs and the second convex ribs are engaged and matched.

[0020] Further, the arc-shaped protective sheet is a double-layer wall structure. A sandwich cavity is formed inside the arc-shaped protective sheet. A hook is provided at the axial edge of one arc-shaped protective sheet, and a slot is provided at the axial edge of the other arc-shaped protective sheet. The hook is inserted and matched with the slot.

[0021] Further, a stop portion is provided at the inner edge of the slot. The stop portion is engaged and matched with the hook. A third convex part is further provided at the outer edge of the slot. A groove is provided on one side of the arc-shaped protective sheet close to the hook. The third convex part is engaged with the groove in a concave-convex manner.

[0022] Further, the arc-shaped protective sheet is made by mixing nylon, polyoxymethylene and a flame retardant component.

[0023] Compared with the prior art, the beneficial effects of a power cable protection device of the present invention are as follows: The power cable protection device adopts a design form of a protective sleeve, two locking structures and a clamp assembly. The two locking structures are respectively installed at the axial ends of the protective sleeve, and the clamp assembly is tightly arranged at the axial middle of the protective sleeve. Moreover, the protective sleeve includes two arc-shaped protective sheets. During use, the two arc-shaped protective sheets are buckled and assembled on the outer side of the power cable, and the arc-shaped protective sheets play a role of wrapping and protecting the insulating layer of the power cable. Combining the two locking structures for fixing at the axial ends and the clamp assembly for fixing at the axial middle, a reliable fixing method for both ends and the middle of the protective sleeve is achieved.

[0024] Among them, the buckle structure includes a main housing, an upper cover plate and a locking block. The main housing is detachably connected to the upper cover plate, and a through groove communicating with the protection channel is provided between the main housing and the upper cover plate. Since the through groove between the main housing and the upper cover plate communicates with the protection channel of the protection sleeve, and the main housing, the upper cover plate and the two arc-shaped protection pieces are radially clamped and matched. After the protection sleeve is installed in place, the upper cover plate and the main housing are buckled at the axial end of the protection sleeve, which can ensure continuous protection of the power cable.

[0025] The locking block is movably installed in the main housing, and is arranged to move obliquely upward along the direction in which the power cable exits the buckle structure. An elastic member is also provided between the locking block and the main housing. The locking block is provided with a first tooth portion near the upper cover plate, and the upper cover plate is provided with a second tooth portion near the main housing. When the power cable is in the channel, the insulating layer of the power cable is radially extruded by the first tooth portion and the second tooth portion, and the radial extrusion force can be converted into an axial frictional force. When the power cable withdraws from the buckle structure, it can drive the locking block to move obliquely upward along the withdrawal direction, that is, the locking block generates a gradually increasing radial extrusion force on the power cable, thus playing a more stable anti-withdrawal role.

[0026] Precisely because the buckle structure of the power cable protection device is designed with a locking block that can automatically prevent withdrawal, and the first tooth portion and the second tooth portion respectively squeeze and rub against the power cable to achieve a stable anti-withdrawal effect, the problem that the protection device is prone to slipping and displacement is avoided, ensuring effective strengthening protection of the local part of the power cable. In addition, the protection sleeve is made of a flexible material, which can not only wrap and protect the power cable, but also be flexibly bent and deformed according to actual needs. Description of the Drawings

[0027] Figure 1 is the front view schematic diagram of the power cable protection device in the embodiment of the present invention;

[0028] Figure 2 is the axial sectional view of the buckle structure of the power cable protection device and the power cable in the embodiment of the present invention;

[0029] Figure 3 is the partial three-dimensional view of the power cable protection device in the embodiment of the present invention;

[0030] Figure 4 is the radial sectional view of the power cable protection device at the clamp assembly in the embodiment of the present invention;

[0031] In the figure: 1 - protective sleeve, 10 - protection channel, 11 - arc-shaped protection piece, 111 - first hole, 112 - second hole, 12 - hook, 13 - card slot, 14 - stop portion, 15 - third convex portion, 16 - groove, 2 - locking structure, 20 - through slot, 21 - main housing, 210 - first tooth portion, 211 - helical tooth, 212 - anti-retreat surface, 213 - guiding surface, 214 - guiding groove, 22 - upper cover plate, 220 - second tooth portion, 23 - locking block, 24 - elastic member, 25 - sliding seat, 26 - lower ear plate, 260 - first convex portion, 27 - upper ear plate, 3 - clamp assembly, 31 - first C-shaped clamp, 32 - second C-shaped clamp, 310 - second convex portion, 311 - first convex rib, 321 - second convex rib, 4 - power cable. Detailed implementation manner

[0032] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present invention is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Such as Figures 1 to 4As shown in the figure, a power cable protection device according to an embodiment of the present invention includes a protection sleeve 1, two locking structures 2, and a clamp assembly 3. The two locking structures 2 are respectively installed at the axial ends of the protection sleeve 1, and the clamp assembly 3 is tightly sleeved at the axial middle of the protection sleeve 1. The protection sleeve 1 is made of a flexible material and includes two arc-shaped protection pieces 11. The two arc-shaped protection pieces 11 are snap-connected to form a protection channel 10 for the power cable 4 to pass through, and the arc-shaped protection pieces 11 are used to wrap and cooperate with the insulation layer of the power cable 4.

[0037] The locking structure 2 includes a main housing 21, an upper cover plate 22, and a locking block 23. The main housing 21 and the upper cover plate 22 are detachably connected. A through slot 20 communicating with the protection channel 10 is provided between the main housing 21 and the upper cover plate 22, and the main housing 21, the upper cover plate 22, and the two arc-shaped protection pieces 11 are radially clamped and matched. The locking block 23 is movably installed in the main housing 21. The locking block 23 is arranged to move obliquely upward along the direction in which the power cable 4 exits the locking structure 2. An elastic member 24 is further provided between the locking block 23 and the main housing 21.

[0038] A first tooth portion 210 is provided on one side of the locking block 23 close to the upper cover plate 22, and a second tooth portion 220 is provided on one side of the upper cover plate 22 close to the main housing 21. The first tooth portion 210 and the second tooth portion 220 are used to radially squeeze and cooperate with the insulation layer of the power cable 4 to generate a backward movement prevention effect on the power cable 4.

[0039] The power cable protection device adopts a design form of a protection sleeve 1, two locking structures 2, and a clamp assembly 3. The two locking structures 2 are respectively installed at the axial ends of the protection sleeve 1, and the clamp assembly 3 is tightly sleeved at the axial middle of the protection sleeve 1. Moreover, the protection sleeve 1 includes two arc-shaped protection pieces 11. During use, the two arc-shaped protection pieces 11 are snap-assembled on the outside of the power cable 4, and the arc-shaped protection pieces 11 play a role of wrapping and protecting the insulation layer of the power cable 4. Combining the two locking structures 2 for fixing at the axial ends and the clamp assembly 3 for fixing at the axial middle, a reliable fixing method for both ends + the middle of the protection sleeve 1 is achieved.

[0040] Among them, the locking structure 2 includes a main housing 21, an upper cover plate 22, and a locking block 23. The main housing 21 and the upper cover plate 22 are detachably connected, and a through slot 20 communicating with the protection channel 10 is provided between the main housing 21 and the upper cover plate 22. Since the through slot 20 between the main housing 21 and the upper cover plate 22 communicates with the protection channel 10 of the protection sleeve 1, and the main housing 21, the upper cover plate 22, and the two arc-shaped protection pieces 11 are radially clamped and matched. After the protection sleeve 1 is installed in place, the upper cover plate 22 and the main housing 21 are buckled at the axial ends of the protection sleeve 1, which can ensure continuous protection for the power cable 4.

[0041] The locking block 23 is movably installed in the main housing 21, and is arranged to move obliquely upward along the direction in which the power cable 4 exits the locking structure 2. An elastic member 24 is further provided between the locking block 23 and the main housing 21. The locking block 23 is provided with a first tooth portion 210 near the upper cover plate 22, and the upper cover plate 22 is provided with a second tooth portion 220 near the main housing 21. The power cable 4 is in the channel 20, and the insulating layer of the power cable 4 is radially extruded by the first tooth portion 210 and the second tooth portion 220. The radial extrusion force can be converted into an axial frictional force. When the power cable 4 withdraws from the locking structure 2, it can drive the locking block 23 to move obliquely upward along the withdrawal direction, that is, the locking block 23 generates an increasingly large radial extrusion force on the power cable 4, thereby playing a more stable anti-withdrawal role.

[0042] It is precisely because the locking structure 2 of the power cable protection device is designed with a locking block 23 that can automatically prevent withdrawal, and the first tooth portion 210 and the second tooth portion 220 can respectively achieve a stable anti-withdrawal effect by extruding and rubbing against the power cable 4, avoiding the problem that the protection device is prone to slipping and displacement, and ensuring effective strengthening protection of the local part of the power cable 4. In addition, the protective sleeve 1 is made of a flexible material, which can not only wrap and protect the power cable 4, but also flexibly bend and deform according to actual needs.

[0043] In this embodiment, the structures of the first tooth portion 210 and the second tooth portion 220 are the same. The first tooth portion 210 includes a plurality of helical teeth 211 arranged in sequence along the axial direction. The helical teeth 211 have a anti-withdrawal surface 212 and a guiding surface 213. The anti-withdrawal surface 212 is parallel to the radial plane of the through groove 20, and the guiding surface 213 extends obliquely downward along the direction in which the power cable 4 exits the locking structure 2. The anti-withdrawal surface 212 and the guiding surface 213 intersect to form an extrusion end. During the process of the power cable 4 entering the locking structure 2, the guiding surface 213 of the helical teeth 211 allows the power cable 4 to slide and displace smoothly, facilitating the accurate installation of the locking structure 2 in place; conversely, during the process of the power cable 4 exiting the locking structure 2, the anti-withdrawal surface 212 of the helical teeth 211 can block the power cable 4, increasing the difficulty of the power cable 4 slipping outwards, and achieving the purpose of one-way locking that gets tighter as it withdraws in combination with the moving direction of the locking block 23.

[0044] Specifically, the inner side wall of the main housing 21 is provided with a guiding groove 214, and the guiding groove 214 extends obliquely upward along the direction in which the power cable 4 exits the locking structure 2. Sliders are provided on both sides of the locking block 23, and the two sliders are respectively in sliding fit with the corresponding guiding grooves 214. Through the sliding fit of the two sliders and the guiding grooves 214 of the main housing 21, the accuracy and reliability of the moving path of the locking block 23 are ensured, thereby ensuring the anti-withdrawal effect on the power cable 4.

[0045] As a further preferred solution, the buckle structure 2 further includes a sliding seat 25. The sliding seat 25 is movably installed in the main housing 21. The locking block 23 is movably sleeved with the sliding seat 25. The elastic member 24 is a cylindrical compression spring installed between the locking block 23 and the sliding seat 25. The sliding seat 25 is axially movably assembled in the main housing 21. The locking block 23 can drive the sliding seat 25 and the elastic member 24 to move synchronously. The elastic member 24 provides a stable radial extrusion force, enabling the locking block 23 to always effectively press-fit with the power cable 4.

[0046] It should be noted that the end of the main housing 21 is provided with a lower ear plate 26, and the end of the upper cover plate 22 is provided with an upper ear plate 27. The upper ear plate 27 and the lower ear plate 26 are buckled up and down and are wrapped and connected with the protective sleeve 1. First convex portions 260 are provided on the inner sides of the lower ear plate 26 and the upper ear plate 27. First holes 111 are opened at the ends of the arc-shaped protective piece 11. The first convex portions 260 are inserted and matched with the first holes 111. Through the cooperation between the lower ear plate 26 of the main housing 21 and the upper ear plate 27 of the upper cover plate 22, the axial ends of the arc-shaped protective piece 11 can be wrapped and fixed. Moreover, the first convex portions 260 of the lower ear plate 26, the first convex portions 260 of the upper ear plate 27 and the first holes 111 of the arc-shaped protective piece 11 are inserted and matched, thus playing a role in axial positioning and connection.

[0047] In this embodiment, the clamp assembly 3 includes a first C-shaped clamp 31 and a second C-shaped clamp 32. The first C-shaped clamp 31 is installed with its opening facing downwards on the outer sides of the two arc-shaped protective pieces 11, and the second C-shaped clamp 32 is installed with its opening facing upwards on the outer side of the first C-shaped clamp 31. Second convex portions 310 are provided on the inner sides of the first C-shaped clamp 31 and the second C-shaped clamp 32. Second holes 112 are opened on the arc-shaped protective piece 11. The second convex portions 310 are inserted and matched with the second holes 112. By buckling the first C-shaped clamp 31 and the second C-shaped clamp 32 up and down, it is ensured that the two arc-shaped protective pieces 11 can be double-layer clamped and fixed.

[0048] As a further preferred solution, a plurality of first convex ridges 311 are provided on the outer side of the first C-shaped clamp 31. The length direction of the first convex ridges 311 is arranged parallel to the axial direction, and the protruding direction of the first convex ridges 311 extends obliquely outward along the direction away from the opening of the first C-shaped clamp 31; a plurality of second convex ridges 321 are provided on the inner side of the second C-shaped clamp 32. The length direction of the second convex ridges 321 is arranged parallel to the axial direction, and the protruding direction of the second convex ridges 321 extends obliquely inward along the direction away from the opening of the second C-shaped clamp 32. The first convex ridges 311 and the second convex ridges 321 are in a locking fit. The second C-shaped clamp 32 is buckled on the outer side of the first C-shaped clamp 31, and the first convex ridges 311 and the second convex ridges 321 are in a locking fit to prevent the two C-shaped clamps from being separated and falling off, ensuring a reliable radial tightening effect on the protective sleeve 1, and making the assembly operation of the clamp assembly 3 more convenient.

[0049] In addition, the arc-shaped protective piece 11 has a double-wall structure, and an interlayer cavity is formed inside the arc-shaped protective piece 11. A hook 12 is provided at the axial edge of one arc-shaped protective piece 11, and a slot 13 is provided at the axial edge of the other arc-shaped protective piece 11. The hook 12 and the slot 13 are in an insertion fit. A stop portion 14 is provided at the inner edge of the slot 13, and the stop portion 14 and the hook 12 are in a stop fit. A third convex portion 15 is further provided at the outer edge of the slot 13, and a groove 16 is provided on the side of the arc-shaped protective piece 11 close to the hook 12. The third convex portion 15 and the groove 16 are in a concave-convex fit. By using the insertion fit between the hook 12 and the slot 13, the stop fit between the stop portion 14 and the hook 12, and the concave-convex fit between the third convex portion 15 and the groove 16, three fitting relationships are formed at the axial joint of the two arc-shaped protective pieces 11, thereby improving the reliability of the snap connection between the two arc-shaped protective pieces 11.

[0050] It should be noted that the arc-shaped protective piece 11 is made of a mixture of nylon, polyoxymethylene and flame retardant components, which is light in weight and high in strength, and has good insulation performance, flame retardant characteristics and weather resistance. It can not only adapt to complex wiring environments such as cable bends, but also effectively prevent the spread of fire along the power cable 4.

[0051] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A power cable protection device, characterized in that, It includes a protective sleeve (1), two locking structures (2) and a clamp assembly (3). The two locking structures (2) are respectively installed at the axial ends of the protective sleeve (1), and the clamp assembly (3) is tightly sleeved at the axial middle of the protective sleeve (1); The protective sleeve (1) is made of a flexible material and includes two arc-shaped protective sheets (11). The two arc-shaped protective sheets (11) are snap-connected to form a protective channel (10) for the power cable (4) to pass through, and the arc-shaped protective sheet (11) is used for wrapping and matching with the insulating layer of the power cable (4); The locking structure (2) includes a main housing (21), an upper cover plate (22) and a locking block (23). The main housing (21) is detachably connected to the upper cover plate (22). A through groove (20) communicating with the protective channel (10) is provided between the main housing (21) and the upper cover plate (22), and the main housing (21), the upper cover plate (22) and the two arc-shaped protective sheets (11) are radially pressed and matched; The locking block (23) is movably installed in the main housing (21). The locking block (23) is arranged to move obliquely upward along the direction in which the power cable (4) exits the locking structure (2). An elastic member (24) is further provided between the locking block (23) and the main housing (21); A first tooth portion (210) is provided on one side of the locking block (23) close to the upper cover plate (22), and a second tooth portion (220) is provided on one side of the upper cover plate (22) close to the main housing (21). The first tooth portion (210) and the second tooth portion (220) are used for radially squeezing and matching with the insulating layer of the power cable (4) to generate a backward stopping effect on the power cable (4); The first tooth portion (210) and the second tooth portion (220) have the same structure. The first tooth portion (210) includes a plurality of helical teeth (211) arranged in sequence along the axis. The helical teeth (211) have a backward stopping surface (212) and a guiding surface (213). The backward stopping surface (212) is parallel to the radial plane of the through groove (20), and the guiding surface (213) extends obliquely downward along the direction in which the power cable (4) exits the locking structure (2). The backward stopping surface (212) and the guiding surface (213) intersect to form a squeezing end; A guiding groove (214) is provided on the inner side wall of the main housing (21). The guiding groove (214) extends obliquely upward along the direction in which the power cable (4) exits the locking structure (2). Sliding blocks are provided on both sides of the locking block (23), and the two sliding blocks are respectively in sliding fit with the corresponding guiding grooves (214); The locking structure (2) further includes a sliding seat (25). The sliding seat (25) is movably installed in the main housing (21). The locking block (23) and the sliding seat (25) are movably sleeved and matched. The elastic member (24) is a cylindrical compression spring installed between the locking block (23) and the sliding seat (25).

2. The power cable protection device according to claim 1, characterized in that, The end of the main housing (21) is provided with a lower ear plate (26), the end of the upper cover plate (22) is provided with an upper ear plate (27), the upper ear plate (27) and the lower ear plate (26) are buckled up and down, and are wrapped and connected with the protective sleeve (1); A first convex portion (260) is provided on the inner side of the lower ear plate (26) and the inner side of the upper ear plate (27). A first hole (111) is opened at the end of the arc-shaped protective piece (11). The first convex portion (260) is in plug-in fit with the first hole (111).

3. The power cable protection device according to claim 1, characterized in that, The clamp assembly (3) includes a first C-shaped clamp (31) and a second C-shaped clamp (32). The first C-shaped clamp (31) is installed with its opening facing downwards on the outer sides of the two arc-shaped protective pieces (11), and the second C-shaped clamp (32) is installed with its opening facing upwards on the outer side of the first C-shaped clamp (31); A second convex portion (310) is provided on the inner side of the first C-shaped clamp (31) and the inner side of the second C-shaped clamp (32). The arc-shaped protective piece (11) is provided with a second hole (112). The second convex portion (310) is in plug-in fit with the second hole (112).

4. The power cable protection device according to claim 3, characterized in that, A plurality of first convex ribs (311) are provided on the outer side of the first C-shaped clamp (31). The length direction of the first convex ribs (311) is arranged parallel to the axial direction, and the protruding direction of the first convex ribs (311) extends obliquely outwards along the direction away from the opening of the first C-shaped clamp (31); A plurality of second convex ribs (321) are provided on the inner side of the second C-shaped clamp (32). The length direction of the second convex ribs (321) is arranged parallel to the axial direction, and the protruding direction of the second convex ribs (321) extends obliquely inwards along the direction away from the opening of the second C-shaped clamp (32). The first convex ribs (311) are in locking fit with the second convex ribs (321).

5. The power cable protection device according to claim 1, characterized in that, The arc-shaped protective piece (11) has a double-wall structure. A sandwich cavity is formed inside the arc-shaped protective piece (11). A hook (12) is provided at the axial edge of one arc-shaped protective piece (11), and a slot (13) is provided at the axial edge of the other arc-shaped protective piece (11). The hook (12) is in plug-in fit with the slot (13).

6. The power cable protection device according to claim 5, characterized in that, A stop portion (14) is provided at the inner edge of the slot (13). The stop portion (14) is in stop fit with the hook (12). A third convex portion (15) is further provided at the outer edge of the slot (13). A groove (16) is provided on the side of the arc-shaped protective piece (11) close to the hook (12). The third convex portion (15) is in concave-convex fit with the groove (16).

7. The power cable protection device according to claim 1, characterized in that, The arc-shaped protective piece (11) is made of a mixture of nylon, polyoxymethylene and a flame retardant component.

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