Composite insulating cross arm for distribution network

Abstract

The invention provides a composite insulating cross arm for a distribution network, which relates to the technical field of insulating cross arms and comprises a mounting frame, an insulating cross arm body, a lightning arrester and a connecting wire. According to the invention, the mounting rack, the insulating cross arm body, the lightning arrester and the connecting wire form a composite insulating cross arm structural member for the distribution network with a unified specification, and the mounting rack can adapt to most of derrick systems and can be popularized and applied universally; the composite insulation cross arm structural member for the distribution network composed of the installation frame, the insulation cross arm body, the lightning arrester and the connecting wire can be conveniently and directly connected with a derrick system, a metal cross arm and an insulation base do not need to be additionally designed, the cable body can be rapidly installed through the designed cable connection system, and therefore the complexity of cable installation is simplified, and the installation efficiency is improved. And the convenience of power grid installation and maintenance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating crossarms, and particularly to a composite insulating crossarm for distribution networks. Background Art

[0002] An insulating crossarm is a key component in a power line for supporting conductors and providing electrical insulation. It is mainly installed on the poles of a transmission line to ensure sufficient insulation distance between the conductors and the poles, prevent current leakage and arc generation, and ensure the safe and stable operation of the power system; compared with a conventional metal crossarm, the insulating crossarm includes an internal insulating composite material (glass fiber reinforced plastic) and an external ceramic housing with umbrella parts, which not only ensures insulation but also has greater structural strength, lighter weight, and improved weather resistance and anti-aging properties.

[0003] Currently, when installing cables on poles, the method of using a metal crossarm and an insulating seat in combination is still mostly used, and its installation process is complex and the specification design cannot be unified; moreover, during the installation of some distribution network cables, lightning arresters need to be installed. Under overvoltage conditions such as lightning strikes and flashovers, the lightning arresters effectively protect the distribution network cables and distribution components. Installing lightning arresters also requires an additional support structure, which further increases the complexity of cable installation. Therefore, the present invention provides a composite insulating crossarm for distribution networks. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a composite insulating crossarm for distribution networks, which solves the problems that the specification design of the conventional crossarm method cannot be unified when installing cables on poles, and installing lightning arresters also requires an additional support structure, increasing the complexity of cable installation.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] A composite insulating crossarm for distribution networks is used for installation on a gin pole system, and the gin pole system has a double guy wire system. The composite insulating crossarm for distribution networks includes:

[0007] An installation frame, which is fixedly installed on the double guy wire system by screws, and the installation frame has a first connecting plate and a second connecting plate;

[0008] An insulating crossarm body, the first end of the insulating crossarm body is fixedly installed with the second connecting plate, and the second end of the insulating crossarm body is provided with a cable connection system for installing a cable body;

[0009] A lightning arrester, the first end of the lightning arrester is fixedly installed with the first connecting plate;

[0010] A connecting wire, and both ends of the connecting wire are fixedly installed with the second end of the lightning arrester and the cable connection system respectively.

[0011] Preferably, the mounting frame is in the shape of an elongated strip as a whole, and a first connecting plate and a second connecting plate are fixedly provided at both ends of the mounting frame respectively. A U-shaped connecting port is provided at the bottom of the mounting frame along the length direction of the mounting frame. Two groups of U-shaped connecting ports are provided in parallel, and the two groups of U-shaped connecting ports correspond to the two tie rods of the double tie rod system. Screw mounting holes are provided on the side of the U-shaped connecting port.

[0012] Preferably, the cable connection system comprises:

[0013] A cover body on the first end of the insulating cross arm body, the end of the cover body is fixedly connected to a connecting column, the end of the connecting column is provided with an arc-shaped drag portion, and the side of the connecting column is provided with an annular protrusion;

[0014] The buckle sleeve is provided with two groups, and the two groups of buckle sleeves are matched to form a cylindrical structure. The inner side of the buckle sleeve is provided with an annular recess corresponding to the annular protrusion, and the side of the buckle sleeve is provided with a cable hole. The end of the buckle sleeve away from the insulating cross arm body is fixedly provided with a first annular undercut;

[0015] The butt head includes an integrally arranged threaded column and a disk block, an end of the disk block is provided with an arc-shaped butt portion, and the arc-shaped butt portion cooperates with the arc-shaped drag portion to clamp the cable body;

[0016] The limiting sleeve comprises: a threaded sleeve, the threaded sleeve is threadedly matched with the threaded column, one end of the threaded sleeve is interlocked with the first annular undercut and fixedly connected with a second undercut ring, and the other end of the threaded sleeve is fixedly connected with a hexagonal block;

[0017] The end of the cover body is located outside the buckle sleeve and is fixedly connected with a limiting piece.

[0018] Preferably, a copper sheet is provided at the end of the connecting wire, and the copper sheet is sleeved on the threaded column and is tightened and fixed by a nut.

[0019] Preferably, the pole holding system comprises: a first "T"-shaped plate and a second "T"-shaped plate which are arranged in parallel and spaced symmetrically, wherein the first "T"-shaped plate and the second "T"-shaped plate are located on both sides of the pole, and the first "T"-shaped plate and the second "T"-shaped plate are fixedly connected to the first lining member on one side close to the pole;

[0020] The double pair of tie rods includes: a first double pair of tie rods, a second double pair of tie rods, and a third double pair of tie rods. The first double pair of tie rods, the second double pair of tie rods, and the third double pair of tie rods are respectively located at the three ends of the first "T"-shaped plate and the second "T"-shaped plate.

[0021] Preferably, the outer sides of the insulating cross arm body and the arrester are both provided with umbrella skirts.

[0022] The present invention provides a composite insulating cross arm for distribution network, which has the following beneficial effects:

[0023] 1. The present invention combines a mounting frame, an insulating crossarm body, a lightning arrester and connecting wires to form a composite insulating crossarm structure for distribution network of uniform specifications. The mounting frame can adapt to most pole holding systems and can be universally promoted and applied. Moreover, the composite insulating crossarm structure for distribution network composed of the mounting frame, the insulating crossarm body, the lightning arrester and the connecting wires is convenient to be directly connected to the pole holding system, and there is no need to additionally design a metal crossarm and an insulating seat. Moreover, through the designed cable connection system, the cable body can be quickly installed, thereby simplifying the complexity of cable installation and improving the convenience of power grid installation and maintenance.

[0024] 2. The present invention specifically designs the structure of a cable connection system, which includes a cover body on the first end of the insulating crossarm body, a connecting column, an arc-shaped drag portion, an annular protrusion, a snap-fit ​​sleeve, a butt head, a limiting sleeve and a limiting piece. When in use, a single snap-fit ​​sleeve can be inserted with one end thereof in an inclined state between the limiting piece and the connecting column, and the cable body and the butt head are installed correspondingly. Then, by rotating the limiting sleeve, the limiting sleeve is moved outward along the axial direction of the butt head, and the first annular inverted buckle is guided into the second inverted buckle ring. After the first annular inverted buckles of the two snap-fit ​​sleeves are both entered into the second inverted buckle ring, the two snap-fit ​​sleeves will be unable to be separated. The first annular inverted buckle of the snap-fit ​​sleeve limits the movement of the second inverted buckle ring, and by rotating the limiting sleeve, the butt head is pushed to move toward the arc-shaped drag portion, so that the cable body is clamped and fixed. This method is more stable for fixing the cable body, and the snap-fit ​​sleeve can cover the contact portion with the cable body to avoid erosion by factors such as rain, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional view of a composite insulating cross arm for a distribution network proposed by the present invention;

[0026] Figure 2 A three-dimensional view of a mounting frame for a composite insulating cross arm for a distribution network proposed by the present invention;

[0027] Figure 3 This is a schematic diagram of the connection of the second end of a cross arm body of a composite insulating cross arm for a distribution network proposed by the present invention;

[0028] Figure 4 It is a three-dimensional schematic diagram of the second end of the insulating cross-arm body of the composite insulating cross-arm for distribution network proposed by the present invention;

[0029] Figure 5 A three-dimensional view of a buckle sleeve of a composite insulating cross arm for a distribution network proposed by the present invention;

[0030] Figure 6Schematic diagram of the cooperation between the head and the limiting sleeve of a composite insulating cross arm for distribution network proposed by the present invention;

[0031] Figure 7 Stereoscopic schematic diagram of the first use state of a composite insulating cross arm for distribution network proposed by the present invention;

[0032] Figure 8 Stereoscopic schematic diagram of the pole holding system of a composite insulating cross arm for distribution network proposed by the present invention;

[0033] Figure 9 Stereoscopic schematic diagram of the second use state of a composite insulating cross arm for distribution network proposed by the present invention.

[0034] Among them, 1. mounting frame; 1a. first connecting plate; 1b. second connecting plate; 1c. U-shaped connection port; 2. lightning arrester; 3. insulating cross arm body; 4. connecting wire; 4a. copper sheet; 5. cable connection system; 501. cover body; 502. limiting member; 503. connecting column; 504. arc dragging part; 505. annular protrusion; 506. buckling sleeve; 506a. cable hole part; 506b. annular concave part; 506c. first annular reverse buckle; 507. head; 507a. threaded column; 507b. disc block; 507c. arc abutting part; 508. limiting sleeve; 508a. threaded sleeve; 508b. hexagonal block; 508c. second reverse buckle ring; 6. cable body; 7. electric pole; 8. pole holding system; 801. first "T"-shaped plate member; 802. second "T"-shaped plate member; 803. first inner lining member; 804. grounding column; 805. first "-"-shaped plate member; 806. second "-"-shaped plate member; 807. second inner lining member; a. double pair of tie rod systems; a1. first double pair of tie rod systems; a2. second double pair of tie rod systems; a3. third double pair of tie rod systems; a4. fourth double pair of tie rod systems; a5. fifth double pair of tie rod systems. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1:

[0037] As Figure 1 - Figure 6As shown in the figure, an embodiment of the present invention provides a composite insulating cross arm for distribution network, which is used to be installed on the pole tower system 8. The pole tower system 8 has at least a set of double guy wire systems a. The pole tower system is a metal component suitable for direct fixed installation on the electric pole 7. Most of the commonly used pole tower systems at present adopt guy wire systems for fixation. The difference lies in the shape of the metal component and the position and quantity of the guy wire systems. This solution defines a pole tower system 8 suitable for having a set of double guy wire systems a. There are two guy wire systems distributed in parallel and equidistantly in the double guy wire system a, making the fixed structure relatively stable and suitable for directly installing other structures on it. The composite insulating cross arm for distribution network includes: a mounting bracket 1, an insulating cross arm body 3, a lightning arrester 2, and a connecting wire 4.

[0038] As Figure 1 shown in the figure, the mounting bracket 1 is fixedly installed on the double guy wire system a by screws. The mounting bracket 1 can be used as a standard part to facilitate the unification of the specifications of each structure. Moreover, the mounting bracket 1 is fixed by screws, which has stronger versatility. The mounting bracket 1 has a first connecting plate 1a and a second connecting plate 1b. Bolt holes are provided on both the first connecting plate 1a and the second connecting plate 1b for installing the insulating cross arm body 3 and the lightning arrester 2. The first end of the insulating cross arm body 3 is fixedly installed with the second connecting plate 1b, preferably fixed by two groups of screws / bolts. A cable connection system 5 for installing the cable body 6 is provided at the second end of the insulating cross arm body 3, which is convenient for fixing the cable body 6 at the second end position of the insulating cross arm body 3. The first end of the lightning arrester 2 is fixedly installed with the first connecting plate 1a, preferably fixed by two groups of screws / bolts. Both ends of the connecting wire 4 are fixedly installed with the second end of the lightning arrester 2 and the cable connection system 5 respectively, so that the cable connection system 5 is conducted with the second end of the lightning arrester 2. The cable connection system 5 is all made of conductive metal components, so that the cable body 6 is electrically connected to the second end of the lightning arrester 2. The first end of the lightning arrester 2 is electrically connected to the pole tower system 8, and the pole tower system 8 is grounded, so that the lightning arrester 2 plays a role in overvoltage protection.

[0039] In this solution, the mounting bracket 1, the insulating cross arm body 3, the lightning arrester 2, and the connecting wire 4 are combined into a composite insulating cross arm structural member for distribution network with a unified specification. The mounting bracket 1 can adapt to most pole tower systems 8 and can be widely promoted and applied. Moreover, the composite insulating cross arm structural member composed of the mounting bracket 1, the insulating cross arm body 3, the lightning arrester 2, and the connecting wire 4 is convenient for directly connecting with the pole tower system 8, and there is no need to design an additional metal cross arm and insulating seat. Moreover, through the designed cable connection system 5, the cable body 6 can be quickly installed, thereby simplifying the complexity of cable installation and improving the convenience of power grid installation and maintenance.

[0040] In an embodiment, as Figure 2The specific structure of the mounting bracket 1 is shown. The mounting bracket 1 is in a long strip shape as a whole, and first connecting plates 1a and second connecting plates 1b are fixedly arranged at both ends of the mounting bracket 1 respectively. A certain distance is maintained between the first connecting plate 1a and the second connecting plate 1b to avoid interference during the operation of the insulating cross-arm body 3 and the lightning arrester 2. A U-shaped connecting port 1c along the length direction of the mounting bracket 1 is provided at the bottom of the mounting bracket 1. There are two groups of U-shaped connecting ports 1c arranged in parallel, and the two pairs of tie rods of the double pair of tie rod systems a correspond to the two pairs of tie rods of the two groups of U-shaped connecting ports 1c. Screw mounting holes are provided on the side of the U-shaped connecting port 1c.

[0041] When in use, directly clamp the two groups of U-shaped connecting ports 1c of the mounting bracket 1 on the double pair of tie rod systems a, and then install screws at the positions of the screw mounting holes on the side of the U-shaped connecting port 1c. Generally, at least two screw mounting holes correspond to each U-shaped connecting port 1c, so as to ensure the stability of the installation of the mounting bracket 1 and the double pair of tie rod systems a.

[0042] In an embodiment, as Figure 3 - Figure 6 shown in [figure reference], the structures and mating position relationships of the cable connection system 5 are shown; specifically, the cable connection system 5 includes: a cover body 501, a connecting column 503, an arc-shaped towing part 504, a ring-shaped protrusion 505, a fastening sleeve 506, a headrest 507, a limiting sleeve 508 and a limiting member 502 at the first end of the insulating cross-arm body 3.

[0043] As Figure 4 shown in [figure reference], a connecting column 503 is fixedly connected to the end of the cover body 501. An arc-shaped towing part 504 is provided at the end of the connecting column 503. The arc-shaped towing part 504 is used to tow the cable body 6. A ring-shaped protrusion 505 is provided on the side of the connecting column 503. The ring-shaped protrusion 505 is used to limit the fastening sleeve 506. There are two groups of fastening sleeves 506, and the two groups of fastening sleeves 506 cooperate to form a cylindrical structure, that is, each group of fastening sleeves 506 is as Figure 5As shown in the figure, it is a semicircular structure, and an annular recess 506b corresponding to the annular protrusion 505 is provided on the inner side of the snap-fit ​​sleeve 506. When the two sets of snap-fit ​​sleeves 506 are snapped together, the annular protrusion 505 is located on the inner side of the annular recess 506b, and the snap-fit ​​sleeve 506 can be restricted from sliding axially relative to the connecting column 503. A cable hole 506a is provided on the side of the snap-fit ​​sleeve 506, and the cable hole 506a corresponds to the position of the arc-shaped drag portion 504, so that the cable body 6 in the arc-shaped drag portion 504 passes through the cable hole 506a, and the snap-fit ​​sleeve 506 is fixed at one end away from the insulating cross arm body 3. A first annular undercut 506c is provided, the butt 507 includes an integrally arranged threaded column 507a and a disk block 507b, an arcuate butt portion 507c is provided at the end of the disk block 507b, and the arcuate butt portion 507c cooperates with the arcuate drag portion 504 to clamp the cable body 6, and the limiting sleeve 508 includes: a threaded sleeve 508a, the threaded sleeve 508a is threadedly matched with the threaded column 507a, one end of the threaded sleeve 508a is interlocked with the first annular undercut 506c and fixedly connected with a second undercut ring 508c, and the other end of the threaded sleeve 508a is fixedly connected with a hexagonal block 508b , the end of the cover body 501 is fixedly connected with a limiting member 502 on the outside of the buckling sleeve 506. In this solution, since the buckling sleeve 506 is a two-group separated structure, a single buckling sleeve 506 can be inserted into the limit piece 502 and the connecting column 503 in an inclined state, and the cable body 6 and the butt 507 (the limiting sleeve 508 is pre-threaded on the butt 507) are installed accordingly, and then the limiting sleeve 508 is rotated to move outward along the axial direction of the butt 507, and the first annular buckle 506c is guided into the second buckle ring 508. c, after the first annular inverted buckles 506c of the two snap-fit ​​sleeves 506 enter the second inverted buckle ring 508c, the two snap-fit ​​sleeves 506 will be unable to separate (one end of the two snap-fit ​​sleeves 506 is restricted by the second inverted buckle ring 508c, and the other end is restricted by the restriction member 502). At this time, the snap-fit ​​sleeves 506 cannot slide relative to the connecting column 503, and the first annular inverted buckle 506c of the snap-fit ​​sleeve 506 restricts the movement of the second inverted buckle ring 508c, and the restriction sleeve 508 continues to rotate, thereby pushing the butt 507 to move toward the arc-shaped drag portion 504, thereby clamping and fixing the cable body 6.

[0044] In one embodiment, if Figure 3 As shown in the figure, a copper sheet 4a is provided at the end of the connecting wire 4, and the copper sheet 4a is sleeved on the threaded column 507a and fixed by a nut. The other end of the connecting wire 4 and the top of the lightning arrester 2 can also be fixed with the same copper sheet and nut structure.

[0045] In order to prevent the arrester 2 from affecting the installation of the insulating crossarm body 3 and the cable body 6 , the length of the insulating crossarm body 3 is designed to be greater than the length of the arrester 2 , so that the protruding portion of the arrester 2 will not contact the cable body 6 .

[0046] Generally, umbrella skirts are provided on the outer sides of the insulating cross-arm body 3 and the lightning arrester 2 to prevent the formation of a continuous flow phenomenon when rainwater passes through, that is, to prevent the liquid flowing on the surfaces of the insulating cross-arm body 3 and the lightning arrester 2 from forming a conductive path on the surfaces.

[0047] In one embodiment, please also refer to Figure 7 - Figure 8 , used in a three-phase power system, the pole system 8 includes: first "T"-shaped plate members 801 and second "T"-shaped plate members 802 that are symmetrically arranged in parallel at intervals. The first "T"-shaped plate members 801 and the second "T"-shaped plate members 802 are located on both sides of the electric pole 7, and first lining members 803 are fixedly connected to the sides of the first "T"-shaped plate members 801 and the second "T"-shaped plate members 802 close to the electric pole 7; the double pair of tie rods system a includes: a first double pair of tie rods system a1, a second double pair of tie rods system a2, and a third double pair of tie rods system a3. The first double pair of tie rods system a1, the second double pair of tie rods system a2, and the third double pair of tie rods system a3 are respectively located at the three ends of the first "T"-shaped plate members 801 and the second "T"-shaped plate members 802. The first double pair of tie rods system a1, the second double pair of tie rods system a2, the third double pair of tie rods system a3, the first "T"-shaped plate members 801, the second "T"-shaped plate members 802, and the first lining members 803 together form the pole system 8. Installation frames 1 can be installed at the first double pair of tie rods system a1, the second double pair of tie rods system a2, and the third double pair of tie rods system a3, so as to install the three cable bodies 6 of the three-phase power system.

[0048] In one embodiment, in order to ensure that the vertical parts of the first "T"-shaped plate members 801 and the second "T"-shaped plate members 802 can be stably supported by the electric pole 7, multiple groups of the first lining members 803 are arranged along the axial direction of the electric pole 7. As Figure 8 shown in, two groups of the first lining members 803 are provided. Reinforcing members are fixedly connected between the first lining members 803 and the first "T"-shaped plate members 801 or the second "T"-shaped plate members 802 to increase the structural strength of the connection between the first lining members 803 and the first "T"-shaped plate members 801 or the second "T"-shaped plate members 802.

[0049] In one embodiment, in order to facilitate the grounding of the pole system 8, a grounding post 804 is fixedly provided on the side surface of the first "T"-shaped plate member 801. The grounding post 804 can be fixed to the grounding wire by using a copper sheet and a nut structure.

[0050] Embodiment Two

[0051] As Figure 9As shown in the figure, the difference from the above embodiments is that the pole holding system 8 includes: a first "one"-shaped plate member 805 and a second "one"-shaped plate member 806 that are symmetrically arranged in parallel at intervals. The first "one"-shaped plate member 805 and the second "one"-shaped plate member 806 are located on both sides of the electric pole 7. A second inner lining member 807 is fixedly connected to the side of the first "one"-shaped plate member 805 and the second "one"-shaped plate member 806 close to the electric pole 7. The double pair of tie rod systems a includes: a fourth double pair of tie rod systems a4 and a fifth double pair of tie rod systems a5. The fourth double pair of tie rod systems a4 and the fifth double pair of tie rod systems a5 are respectively located at both ends of the first "one"-shaped plate member 805 and the second "one"-shaped plate member 806. This pole holding system 8 is applicable to a two-phase power system. The first "one"-shaped plate member 805, the second "one"-shaped plate member 806, the second inner lining member 807, the fourth double pair of tie rod systems a4, and the fifth double pair of tie rod systems a5 constitute the pole holding system 8. Among them, mounting frames 1 can be installed at the fourth double pair of tie rod systems a4 and the fifth double pair of tie rod systems a5, so as to install the two cable bodies 6 of the two-phase power system.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A composite insulating cross arm for a distribution network, used for installation on a pole system (8), characterized in that: The pole holding system (8) has a double pair of tie rods (a), and the composite insulating cross arm for the distribution network includes: A mounting frame (1), the mounting frame (1) being fixedly mounted on the double tie rod system (a) by means of screws, and the mounting frame (1) comprising a first connecting plate (1a) and a second connecting plate (1b); An insulating cross arm body (3), wherein a first end of the insulating cross arm body (3) is fixedly mounted to a second connecting plate (1b), and a second end of the insulating cross arm body (3) is provided with a cable connection system (5) for mounting a cable body (6); A lightning arrester (2), wherein a first end of the lightning arrester (2) is fixedly mounted on a first connecting plate (1a); A connecting wire (4), wherein two ends of the connecting wire (4) are respectively fixedly mounted to the second end of the lightning arrester (2) and the cable connection system (5).

2. The composite insulating cross arm for distribution network according to claim 1, characterized in that: The mounting frame (1) is in the shape of an elongated strip as a whole, and a first connecting plate (1a) and a second connecting plate (1b) are fixedly provided at both ends of the mounting frame (1), respectively; a U-shaped connecting port (1c) is provided at the bottom of the mounting frame (1) along the length direction of the mounting frame (1); two groups of U-shaped connecting ports (1c) are provided in parallel, and the two groups of U-shaped connecting ports (1c) correspond to the two tie rods of the double tie rod system (a); and screw mounting holes are provided on the sides of the U-shaped connecting ports (1c).

3. The composite insulating cross arm for distribution network according to claim 1, characterized in that: The cable connection system (5) comprises: A cover body (501) is provided on the first end of the insulating cross arm body (3); the end of the cover body (501) is fixedly connected to a connecting column (503); the end of the connecting column (503) is provided with an arc-shaped drag portion (504); and the side of the connecting column (503) is provided with an annular protrusion (505).

4. A composite insulating cross arm for distribution network according to claim 3, characterized in that: The cable connection system (5) comprises: a snap-fit ​​sleeve (506), wherein two groups of snap-fit ​​sleeves (506) are provided, and the two groups of snap-fit ​​sleeves (506) cooperate to form a cylindrical structure, wherein an annular recess (506b) corresponding to the annular protrusion (505) is provided on the inner side of the snap-fit ​​sleeve (506), a cable hole (506a) is provided on the side of the snap-fit ​​sleeve (506), and a first annular undercut (506c) is fixedly provided on one end of the snap-fit ​​sleeve (506) away from the insulating cross arm body (3).

5. The composite insulating cross arm for distribution network according to claim 4, characterized in that: The cable connection system (5) comprises: a butt head (507), wherein the butt head (507) comprises an integrally arranged threaded column (507a) and a disk block (507b), wherein an arc-shaped butt portion (507c) is provided at the end of the disk block (507b), and the arc-shaped butt portion (507c) cooperates with the arc-shaped drag portion (504) to clamp the cable body (6).

6. A composite insulating cross arm for distribution network according to claim 5, characterized in that: The cable connection system (5) comprises: a limiting sleeve (508), the limiting sleeve (508) comprising: a threaded sleeve (508a), the threaded sleeve (508a) is threadedly matched with the threaded column (507a), one end of the threaded sleeve (508a) is interlocked with the first annular undercut (506c) and fixedly connected with a second undercut ring (508c), and the other end of the threaded sleeve (508a) is fixedly connected with a hexagonal block (508b); A limiting member (502) is fixedly connected to the end of the cover body (501) and located outside the buckle sleeve (506).

7. The composite insulating cross arm for distribution network according to claim 6, characterized in that: A copper sheet (4a) is provided at the end of the connecting wire (4); the copper sheet (4a) is sleeved on the threaded column (507a) and is tightened and fixed by a nut.

8. The composite insulating cross arm for distribution network according to claim 1, characterized in that: The pole holding system (8) comprises: a first "T"-shaped plate (801) and a second "T"-shaped plate (802) which are arranged symmetrically in parallel and at intervals, wherein the first "T"-shaped plate (801) and the second "T"-shaped plate (802) are located on both sides of the pole (7), and a first lining member (803) is fixedly connected to one side of the first "T"-shaped plate (801) and the second "T"-shaped plate (802) close to the pole (7).

9. The composite insulating cross arm for distribution network according to claim 8, characterized in that: The double pair of tie rods (a) includes: a first double pair of tie rods (a1), a second double pair of tie rods (a2), and a third double pair of tie rods (a3). The first double pair of tie rods (a1), the second double pair of tie rods (a2), and the third double pair of tie rods (a3) ​​are respectively located at the three ends of the first "T"-shaped plate (801) and the second "T"-shaped plate (802).

10. The composite insulating cross arm for distribution network according to claim 1, characterized in that: The outer sides of the insulating cross arm body (3) and the lightning arrester (2) are both provided with umbrella skirts.

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