CN220180627U - Wrist arm insulation protection device - Google Patents

Abstract

The utility model provides a cantilever insulation protection device, which relates to the field of electrified railway contact networks and comprises an insulation spacer bush and a fixing structure; the insulating spacer comprises a sleeve body structure and a supporting partition plate; the sleeve body structure is made of nonmetallic insulating soft materials, and the side wall of the sleeve body structure is provided with axial openings which axially penetrate through two ends of the sleeve body structure and are communicated with the inner cavity of the sleeve body structure and the outer peripheral surface; the supporting partition plate is arranged on the outer peripheral surface of the insulating spacer bush and is close to one end of the insulating spacer bush in the axial direction; in the assembled state, the sleeve structure is sleeved on the wrist structure, the fixing structure is connected with the sleeve structure, and the width of the axial opening is limited so that the sleeve structure is covered and fastened outside the wrist structure. According to the utility model, foreign matters can be prevented from accumulating and remaining at the cantilever structure, meanwhile, the insulating property of the cantilever structure and the overstock electrical structure is increased, the creepage distance of the insulator at the cantilever structure is increased, and the cantilever structure is ensured not to generate electrical accidents such as short circuit, flashover, insulator ablation and the like due to the lap joint of the foreign matters.

Description

Wrist arm insulation protection device

Technical Field

The utility model relates to the field of electrified railway contact networks, in particular to a cantilever insulation protection device.

Background

The overhead contact system of the traction power supply system of the high-speed railway is characterized in that the overhead contact system is mainly laid outdoors and has long wiring length, and a carrier rope and a contact line are connected with a support column through a cantilever structure and used for supporting contact suspension and playing a role in transferring load. The cantilever structure generally adopts an insulating cantilever, namely the cantilever pipe is insulated to the ground through an insulator.

Creepage distance is the shortest path between two conductive parts or between a conductive part and the equipment protection interface measured along the insulating surface, i.e. in different use cases, the insulating material around the conductor is electrically polarized, causing the insulating material to exhibit a charging phenomenon. The creepage distance of the insulator refers to the shortest distance or the sum of shortest distances between two parts of the insulator which normally bear running voltage along an insulating surface, and the minimum creepage distance is limited so as to prevent creepage phenomena from occurring between two conductors through pollutants possibly occurring on the surface of an insulating material. Creepage distance in operation, the shortest insulation distance between the two conductors to be installed with electricity is greater than the minimum creepage distance allowed, in order to prevent the ignition between devices or between devices and ground, thereby threatening the normal operation of the line.

Because the structure of the joint of the cantilever pipe and the insulator is complex when the joint is exposed in an outdoor environment for a long time, a natural perching platform is constructed for birds, mice and other animals, because the foreign matters such as branches, iron wires and the like brought by animal activities are accumulated on the platform and extend to the insulator or pollute the insulator, the creepage distance of the insulator is shortened, the electrical insulation performance of the cantilever structure is reduced, the cantilever pipe in the cantilever structure is flashover to a support column, the insulator is even burnt when the arc is severe, an isolating switch is tripped, and the contact net is powered off, so that the normal operation of a train is influenced; meanwhile, other electric structures such as an electric cable for the upper span can be built above the cantilever structure, a safety insulation distance with a specified requirement is also formed between the upper span electric structure and the cantilever structure, and the insulation distance between the upper span electric structure and the cantilever structure is shortened when wind blows foreign matters to fall or animals pass through, so that electric accidents can also occur. In the operation and maintenance process, faults such as short circuit, ablation and the like often occur, so that the problems of high difficulty in daily management of contact network equipment, high safety risk coefficient and high operation and maintenance cost are caused.

In the prior art, the protection plate or the protective sleeve is added at the insulator to prevent the foreign matters from spreading to the insulator, so that the problem is relieved, but the foreign matters cannot be prevented from accumulating, and the wrist arm structure can cause electrical accidents such as short circuit, flashover, insulator ablation and the like due to the lap joint of the foreign matters.

Disclosure of Invention

The utility model aims to provide a cantilever insulation protection device so as to alleviate the technical problems.

In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme:

the embodiment of the utility model provides a cantilever insulation protection device which comprises an insulation spacer bush and a fixing structure;

the insulating spacer comprises a sleeve body structure and a supporting partition plate; the sleeve body structure is made of a nonmetallic insulating soft material, and the side wall of the sleeve body structure is provided with an axial opening which penetrates through two ends of the sleeve body structure along the axial direction of the sleeve body structure and is communicated with the inner cavity of the sleeve body structure and the outer peripheral surface; the supporting partition plate is arranged on the peripheral surface of the insulating spacer bush and is close to one end of the insulating spacer bush in the axial direction;

in the assembled state, the sleeve body structure is sleeved outside the wrist arm structure, and the fixing structure is connected with the sleeve body structure and limits the width of the axial opening so that the sleeve body structure is covered and fastened outside the wrist arm structure.

The effect that the cantilever insulation protector that this embodiment provided can reach includes:

because the cantilever insulation protection device provided by the embodiment carries out cladding treatment on the cantilever structure, the part of the cantilever structure which is easy to hook and accumulate sundries originally is covered, so that the part becomes relatively smooth, and therefore, the accumulation and retention of the foreign matters at the cantilever structure can be prevented, and meanwhile, the supporting partition plate is used for playing a role of shielding so as to prevent the foreign matters from spreading to the insulator, and further avoid accumulation and clamping stagnation of the foreign matters; in addition, as the sleeve body structure is made of nonmetallic insulating soft materials and is coated outside the cantilever structure, the insulating performance of the cantilever structure and the overstock electrical structure can be increased, the creepage distance of an insulator at the cantilever structure is increased, and the cantilever structure is ensured not to generate electrical accidents such as short circuit, flashover, insulator ablation and the like due to the lap joint of foreign matters; in addition, the cantilever insulation protection device has the advantages of convenience in installation, good weather resistance, strong universality and the like.

In an alternative implementation manner of this embodiment, more preferably, the fixing structure includes a first connection edge, a second connection edge, a buckle, and a buckle hole. The first connecting edge is arranged at one side edge part of the axial opening on the sleeve body structure, and the second connecting edge is arranged at the other side edge part of the axial opening on the sleeve body structure and is opposite to the first connecting edge. The buckle is arranged on the first connecting edge, and the buckle hole is arranged on the second connecting edge; in the assembled state, the snap fastener is locked in the snap fastener hole so as to limit the width of the axial opening, so that the sleeve body structure is fastened outside the wrist arm structure.

Still preferably, the buckle is made of soft material, one end of the buckle is connected to the outer peripheral surface of the sleeve body structure, the other end of the buckle is provided with a conical head end, and in an assembled state, the conical head end of the buckle is extruded from one side corresponding to the buckle hole and then passes through the buckle hole, and then is limited at the other side of the buckle hole.

In an alternative implementation manner of this embodiment, preferably, the buckle is integrally formed with the sleeve body structure.

In an alternative implementation of this embodiment, it is preferable that the fixing structure includes a fastening strap; in the assembled state, the fastening belt is self-locked after at least one circle of the sleeve body structure is wound around the circumference of the sleeve body structure.

Further preferably, the fixing structure further includes a first connection edge, a second connection edge, a first anti-slip belt hole, and a second anti-slip belt hole; the first connecting edge is arranged at one side edge part of the axial opening on the sleeve body structure, and the second connecting edge is arranged at the other side edge part of the axial opening on the sleeve body structure and is opposite to the first connecting edge; the first anti-falling belt hole is formed in the first connecting edge, and the second anti-falling belt hole is formed in the second connecting edge; in the assembled state, the fastening strap passes through the first anti-slip strap hole and the second anti-slip strap hole.

In an alternative implementation manner of this embodiment, more preferably, the fixing structure includes an arc-shaped clip, an arc-shaped fixing member and a fastening member; the support partition plate comprises an arc-shaped mounting part sleeved outside the sleeve body structure; the arc-shaped fixing piece penetrates through the inner cavity of the arc-shaped mounting part, and two ends of the arc-shaped fixing piece are exposed out of the arc-shaped mounting part; the arc-shaped clamp is sleeved outside the sleeve body structure and is opposite to the arc-shaped mounting part; the fastener is used for fixing one end of the arc-shaped clamp and one end of the arc-shaped fixing piece together, and fixing the other end of the arc-shaped clamp and the other end of the arc-shaped fixing piece together, so that the sleeve body structure is coated and fastened outside the wrist arm structure.

Further preferably, both ends of the arc-shaped fixing piece are in a screw shape; fixing holes are respectively formed at two ends of the arc-shaped clamp; the fastener includes a nut; and two ends of the arc-shaped fixing piece respectively penetrate through the fixing holes at the corresponding ends of the arc-shaped clamp and are connected by the nuts in a threaded manner so as to be locked.

Further preferably, the fastener further comprises a flat washer, a spring washer and a cotter pin; two ends of the arc-shaped fixing piece are respectively provided with a transverse pin hole; and the two ends of the arc-shaped fixing piece respectively penetrate through the fixing holes of the corresponding ends of the arc-shaped clamp, the flat gasket, the spring gasket and the nut, and then are inserted into the transverse pin holes by the cotter pin to be locked.

Preferably, the sleeve structure and the arc-shaped fixing piece are integrally formed.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of the overall structure of a cantilever insulation guard provided by an embodiment of the present utility model;

FIG. 2 is a front view of the whole structure of the wrist insulation protection device according to the embodiment of the present utility model;

FIG. 3 is a left side view of the whole structure of the cantilever insulation protection device according to the embodiment of the present utility model;

fig. 4 is a right side view of the whole structure of the cantilever insulation protection device according to the embodiment of the present utility model;

FIG. 5 is an assembly diagram of the cantilever insulation protection device according to the embodiment of the present utility model assembled on a cantilever structure;

fig. 6 is a cross-sectional view taken along A-A of fig. 5.

Icon: 100-cantilever insulation protection device; 200-insulators; 210-umbrella skirt; 220-insulator steel caps; 300-cantilever pipe; 400-clamping seat; 1-an insulating spacer; 11-a sleeve structure; 101-a first lumen; 102-a second lumen; 103-a third lumen; 111-a first connection edge; 112-a second connecting edge; 12-supporting a separator; 121-an arc-shaped mounting portion; 21-a buckle; 22-a snap hole; 3-fastening a belt; 31-fastening the belt holes; 41-arc-shaped clamp; 42-arc-shaped fixing piece; 43-fastener; 431-nut; 432-plain washer; 433-spring washers; 434-cotter pin.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters designate like items in the drawings, and thus once an item is defined in one drawing, no further definition or explanation thereof is necessary in the subsequent drawings.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in place when the inventive product is used, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal" and "vertical" do not denote that the component is required to be absolutely horizontal or overhanging, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

The present embodiment provides a cantilever insulation protection device 100, referring to fig. 1 to 4, the cantilever insulation protection device 100 includes an insulation spacer 1 and a fixing structure. The insulating spacer bush 1 comprises a sleeve body structure 11 and a supporting partition plate 12; the sleeve body structure 11 is made of a nonmetallic insulating soft material, and the side wall of the sleeve body structure 11 is provided with an axial opening which axially penetrates through the two ends of the sleeve body structure 11 and is communicated with the inner cavity of the sleeve body structure 11 and the outer peripheral surface; the supporting partition plate 12 is arranged on the outer peripheral surface of the insulating spacer 1 and is close to one end of the insulating spacer 1 in the axial direction. The assembly state is as follows: the sleeve structure 11 is sleeved outside the cantilever structure, and the fixing structure is connected to the sleeve structure 11 and defines an axial opening width so that the sleeve structure 11 is wrapped and fastened outside the cantilever structure.

Referring to fig. 5 and 6, the conventional cantilever structure includes an insulator 200 and a cantilever pipe 300, the insulator 200 has an umbrella skirt 210 and an insulator steel cap 220, and the cantilever pipe 300 is disposed at a card socket 400 and connected with the insulator 200. The assembly method of the cantilever insulation protection device 100 provided in this embodiment is as follows:

as shown in fig. 5 and 6, the sleeve structure 11 is opened from the axial opening on the side wall of the sleeve structure 11, the sleeve structure 11 made of soft material is deformed and then sleeved outside the cantilever structure, the sleeve structure 11 is moved back and forth and rotated to adjust the position and the direction of the sleeve structure 11, the supporting partition 12 shields the upper end of the cantilever structure, a part of the sleeve structure 11 is sleeved outside the insulator 200, the other part of the sleeve structure is sleeved outside the cantilever structure 300, specifically, in combination with fig. 2, the axial cavity of the sleeve structure 11 comprises a first cavity 101, a second cavity 102 and a third cavity 103 which are sequentially communicated, the first cavity 101 is buckled and coated outside at least one piece of insulator umbrella skirt 210 of the insulator 200, the second cavity 102 is buckled and coated outside the U-shaped clamping seat 400 at the joint of the cantilever structure 300 and the insulator 200, the third cavity 103 is buckled and coated outside the arm structure 300, the supporting partition 12 is sleeved outside the insulator steel cap 220, and then the sleeve structure 11 is fastened outside the sleeve structure by utilizing the axial opening of the sleeve structure 11 which is fixedly connected with the sleeve structure 11.

The cantilever insulation protection device 100 provided in this embodiment can achieve the following effects:

because the cantilever insulation protection device 100 provided in this embodiment performs cladding treatment on the cantilever structure, the positions of the cantilever structure, which are originally easy to hook and accumulate sundries, are covered, so that the positions become relatively smooth, and therefore, the foreign matters can be prevented from accumulating and remaining at the cantilever structure, and meanwhile, the supporting partition plate 12 is used for playing a role of shielding so as to prevent the foreign matters from spreading to the insulator, and further prevent accumulation and clamping stagnation of the foreign matters; in addition, as the sleeve body structure 11 is made of a nonmetallic insulating soft material and is coated outside the cantilever structure, the insulating performance of the cantilever structure and the overstock electrical structure can be increased, the creepage distance of an insulator at the cantilever structure can be increased, and the cantilever structure can be ensured not to generate electrical accidents such as short circuit, flashover, insulator ablation and the like due to the lap joint of foreign matters; in addition, the cantilever insulation protection device 100 has the advantages of convenience in installation, good weather resistance, strong universality and the like.

In the present embodiment, the supporting partition 12 has various angles with respect to the sleeve structure 11, and is preferably perpendicular, but may be disposed obliquely.

Referring to fig. 1 to 4, in this embodiment, the fixing structure has various alternative structures, and the following provides alternative structures, which may be used alternatively or in combination, preferably in combination, to fasten each portion of the sleeve structure 11 in the axial direction:

as shown in fig. 1 to 4, the fixing structure may include a first connection side 111, a second connection side 112, a buckle 21, and a buckle hole 22; the first connecting edge 111 is arranged at one side edge part of the axial opening on the sleeve body structure 11, and the second connecting edge 112 is arranged at the other side edge part of the axial opening on the sleeve body structure 11 and is opposite to the first connecting edge 111; the buckle 21 is arranged on the first connecting edge 111, and the buckle hole 22 is arranged on the second connecting edge 112; in the assembled state, the catch 21 is locked to the catch hole 22 to define the width of the axial opening, such that the sleeve structure 11 is cinched outside the cantilever structure. Wherein, a buckle 21 and a corresponding buckle hole 22 are used as a group of buckle type fixing structures, and the buckle type fixing structures can be provided with one or more groups, preferably a plurality of groups, and are axially and alternately distributed along the sleeve body structure 11 so as to fasten the sleeve body structure 11, the wrist arm insulation protection device 100, the insulator 200 and the clamping seat 400 respectively.

Preferably, the buckle 21 is made of soft material, one end of the buckle 21 is connected to the outer peripheral surface of the sleeve structure 11, and the other end of the buckle is provided with a conical head end, and in the assembled state, the conical head end of the buckle 21 is extruded from one side of the corresponding buckle hole 22, passes through the buckle hole 22, and is limited on the other side of the buckle hole 22.

Preferably, the clasp 21 is integrally formed with the sleeve structure 11.

With continued reference to fig. 1 to 4, the fixing structure may include a fastening strap 3, so that in an assembled state, the fastening strap 3 is self-locked around the sleeve body structure 11 at least one circle along the circumference of the sleeve body structure 11, and the self-locking mode may be knotted self-locking or self-locking with reference to a locking structure of the waistband.

Preferably, the fixing structure further includes a first connection edge 111, a second connection edge 112, and a fastening tape hole 31, the fastening tape hole 31 including a first anti-slip tape hole and a second anti-slip tape hole; the first connecting edge 111 is arranged at one side edge part of the axial opening on the sleeve body structure 11, and the second connecting edge 112 is arranged at the other side edge part of the axial opening on the sleeve body structure 11 and is opposite to the first connecting edge 111; the first anti-falling belt hole is arranged on the first connecting edge 111, and the second anti-falling belt hole is arranged on the second connecting edge 112; in the assembled state, the fastening strap 3 passes through the first anti-falling strap hole and the second anti-falling strap hole, and the fastening strap is prevented from falling out of the sleeve body structure 11 through the fastening strap hole 31, wherein one fastening strap 3 and the corresponding first anti-falling strap hole and second anti-falling strap hole are used as a group of fastening strap type fixing structures, one or more groups of fastening strap type fixing structures can be arranged, and preferably a plurality of groups of fastening strap type fixing structures are arranged, and are distributed at intervals along the axial direction of the sleeve body structure 11 so as to fasten the sleeve body structure 11 and the cantilever insulation protection device 100, the insulator 200 and the clamping seat 400 respectively.

With continued reference to fig. 1-4, the securing structure may include an arcuate clip 41, an arcuate securing member 42, and a fastener 43. The supporting partition plate 12 comprises an arc-shaped mounting part 121 sleeved outside the sleeve body structure 11; the arc fixing piece 42 passes through the inner cavity arranged on the arc installation part 121, and two ends of the arc fixing piece are exposed out of the arc installation part 121; the arc-shaped clamp 41 is sleeved outside the sleeve body structure 11 and is opposite to the arc-shaped mounting part 121; the fastener 43 is used to fix one end of the arc clip 41 with one end of the arc fixing member 42 and the other end of the arc clip 41 with the other end of the arc fixing member 42 so that the cuff structure 11 is wrapped around and fastened to the outside of the wrist structure.

Preferably, as shown in fig. 1 to 4, both ends of the arc-shaped fixing member 42 are made screw-shaped; fixing holes are respectively arranged at two ends of the arc-shaped clamp 41; the fastener 43 includes a nut 431; both ends of the arc fixing member 42 are respectively threaded by nuts 431 to be locked after passing through fixing holes of the corresponding ends of the arc clips 41. It is further preferred that fastener 43 further includes a flat washer 432, a spring washer 433, and a cotter 434; transverse pin holes are respectively formed at two ends of the arc-shaped fixing piece 42; both ends of the arc fixing member 42 are inserted into the transverse pin holes by the cotter pins 434 to be locked after passing through the fixing holes, the flat washers 432, the spring washers 433 and the nuts 431, respectively, at the corresponding ends of the arc clips 41.

Wherein the sleeve structure 11 is preferably integrally formed with the arcuate mounting member 42.

Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are only required to be seen with each other; the above embodiments in the present specification are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A cantilever insulation guard (100), characterized by: comprises an insulating spacer bush (1) and a fixing structure;

the insulating spacer bush (1) comprises a bush body structure (11) and a supporting partition plate (12); the sleeve body structure (11) is made of a nonmetallic insulating soft material, and the side wall of the sleeve body structure is provided with an axial opening which penetrates through two ends of the sleeve body structure (11) along the axial direction of the sleeve body structure (11) and is communicated with the inner cavity and the outer peripheral surface of the sleeve body structure (11); the supporting partition plate (12) is arranged on the peripheral surface of the insulating spacer bush (1) and is close to one end of the insulating spacer bush (1) in the axial direction;

in the assembled state, the sleeve body structure (11) is sleeved outside the cantilever structure, and the fixing structure is connected with the sleeve body structure (11) and limits the width of the axial opening so that the sleeve body structure (11) is wrapped and fastened outside the cantilever structure.

2. The cantilever insulation guard (100) according to claim 1, wherein: the fixing structure comprises a first connecting edge (111), a second connecting edge (112), a buckle (21) and a buckle hole (22);

the first connecting edge (111) is arranged at one side edge part of the axial opening on the sleeve body structure (11), and the second connecting edge (112) is arranged at the other side edge part of the axial opening on the sleeve body structure (11) and is opposite to the first connecting edge (111);

the buckle (21) is arranged on the first connecting edge (111), and the buckle hole (22) is arranged on the second connecting edge (112); in the assembled state, the buckle (21) is locked to the buckle hole (22) so as to limit the width of the axial opening, and the sleeve body structure (11) is clamped outside the wrist arm structure.

3. The cantilever insulation guard (100) according to claim 2, wherein: the buckle (21) adopts a structure made of soft materials, one end of the buckle is connected to the outer peripheral surface of the sleeve body structure (11), the other end of the buckle is provided with a conical head end, and in an assembled state, the conical head end of the buckle (21) is extruded from one side corresponding to the buckle hole (22) to pass through the buckle hole (22) and then is limited at the other side of the buckle hole (22).

4. The cantilever insulation guard (100) according to claim 2, wherein: the buckle (21) and the sleeve body structure (11) are integrally formed.

5. The cantilever insulation guard (100) according to claim 1, wherein: the fixing structure comprises a fastening strap (3);

in the assembled state, the fastening belt (3) is self-locked along the Zhou Xiangrao of the sleeve body structure (11) after at least one circle of the sleeve body structure (11).

6. The cantilever insulation guard (100) according to claim 5, wherein: the fixing structure further comprises a first connecting edge (111), a second connecting edge (112), a first anti-falling belt hole and a second anti-falling belt hole;

the first connecting edge (111) is arranged at one side edge part of the axial opening on the sleeve body structure (11), and the second connecting edge (112) is arranged at the other side edge part of the axial opening on the sleeve body structure (11) and is opposite to the first connecting edge (111);

the first anti-falling belt hole is formed in the first connecting edge (111), and the second anti-falling belt hole is formed in the second connecting edge (112); in the assembled state, the fastening strap (3) passes through the first anti-falling strap hole and the second anti-falling strap hole.

7. The cantilever insulation guard (100) according to claim 1, wherein: the fixing structure comprises an arc-shaped clamp (41), an arc-shaped fixing piece (42) and a fastening piece (43);

the supporting partition plate (12) comprises an arc-shaped mounting part (121) sleeved outside the sleeve body structure (11); the arc-shaped fixing piece (42) penetrates through the inner cavity of the arc-shaped mounting part (121), and two ends of the arc-shaped fixing piece are exposed out of the arc-shaped mounting part (121);

the arc-shaped clamp (41) is sleeved outside the sleeve body structure (11) and is opposite to the arc-shaped mounting part (121);

the fastener (43) is used for fixing one end of the arc-shaped clamp (41) and one end of the arc-shaped fixing piece (42) together, and fixing the other end of the arc-shaped clamp (41) and the other end of the arc-shaped fixing piece (42) together, so that the sleeve body structure (11) is coated and fastened outside the wrist structure.

8. The cantilever insulation guard (100) according to claim 7, wherein:

both ends of the arc-shaped fixing piece (42) are in a screw shape; fixing holes are respectively formed at two ends of the arc-shaped clamp (41); the fastener (43) comprises a nut (431);

the two ends of the arc-shaped fixing piece (42) respectively penetrate through the fixing holes at the corresponding ends of the arc-shaped clamp (41) and are in threaded connection with the nuts (431) to be locked.

9. The cantilever insulation guard (100) according to claim 8, wherein: the fastener (43) further includes a flat washer (432), a spring washer (433), and a cotter pin (434);

two ends of the arc-shaped fixing piece (42) are respectively provided with a transverse pin hole;

the two ends of the arc-shaped fixing piece (42) respectively penetrate through the fixing holes of the corresponding ends of the arc-shaped clamp (41), the flat gasket (432), the spring gasket (433) and the nut (431) and then are inserted into the transverse pin holes by the cotter pins (434) to be locked.

10. The cantilever insulation guard (100) according to any one of claims 7-9, wherein: the sleeve body structure (11) and the arc-shaped fixing piece (42) are integrally formed.