CN112282485A

CN112282485A - Cross arm assembly for supporting power line

Info

Publication number: CN112282485A
Application number: CN202011199215.2A
Authority: CN
Inventors: 姜琴琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-01
Filing date: 2020-11-01
Publication date: 2021-01-29

Abstract

The invention discloses a cross arm assembly for supporting a power line, which comprises two hoops, wherein the hoops are clamped on a power line body, the two hoops are respectively positioned at the left side and the right side of the power line body, and the front ends and the rear ends of the two hoops are mutually fastened through a bolt assembly; an n-shaped cross arm is welded and fixed on the outer end face of each hoop, a plurality of power line supporting devices are fixed on each cross arm, and two reinforcing blocks which are symmetrically arranged in the front-back direction are welded and fixed at the joint of each cross arm and the hoop on the corresponding side; when the power line cross arm assembly is used, two anchor ears can be fixed on the power line rod body only by using two bolt assemblies, namely, the cross arm and the power line rod body can be fixed, so that the power line cross arm assembly has the advantage of convenience in fixing with the power line rod body compared with the traditional power line cross arm assembly on the market.

Description

Cross arm assembly for supporting power line

Technical Field

The invention relates to the technical field of electric power facilities, in particular to a cross arm assembly for supporting a power line.

Background

The power line cross arm assembly is a device for supporting a power line, the power line cross arm assembly on the market is fixed on a power rod body at present, but when the power line cross arm assembly on the market is fixed with the power rod body, the defect that the power line cross arm assembly and the power rod body are inconvenient to fix exists, and therefore inconvenience can be brought to installation personnel.

Disclosure of Invention

In view of the defects of the prior art, the invention provides a cross arm assembly for supporting a power line, which has the advantage of being conveniently fixed with a power line rod body compared with the traditional power line cross arm assembly on the market.

The cross arm assembly for supporting the power line comprises two hoops which are clamped on a power line body, wherein the two hoops are respectively positioned on the left side and the right side of the power line body, and the front ends and the rear ends of the two hoops are mutually fastened through a bolt assembly; all welded fastening has the cross arm of "pi" font on the outer terminal surface of every staple bolt, all is fixed with a plurality of power line strutting arrangement on every cross arm, and every cross arm and the junction of the staple bolt of corresponding side all welded fastening have two to be the stiffener of symmetry setting around.

The invention discloses a cross arm assembly for supporting power lines, wherein each power line supporting device comprises a clamping seat, a clamping block and a ceramic base, the lower end of the ceramic base is fixed on a cross arm, the clamping seat is fixed at the upper end of the ceramic base, the clamping block is connected to the clamping seat in a sliding manner, the right end of the clamping seat is provided with an upward extending vertical edge, the clamping block is used for clamping the power lines on the vertical edge, the inner wall of the vertical edge is provided with a first recess for embedding a power line part, and the right end of the clamping block is provided with a second recess for embedding the power line part; a locking mechanism for locking the clamping block is arranged between the clamping block and the clamping seat, and an unlocking mechanism for unlocking the clamping block is arranged on the clamping block; after the power line supporting device is adopted, the power line supporting device can conveniently clamp the power line, namely, the power line can be conveniently fixed on the cross arm, and therefore convenience can be brought to fixing and laying of the power line.

The invention discloses a cross arm assembly for supporting a power line, wherein a locking mechanism comprises a sliding block, a sliding groove is formed in the inner bottom of a clamping seat, the sliding block is connected in the sliding groove in a sliding manner, two guide posts which are symmetrically arranged left and right are integrally formed on the lower end surface of the sliding block, guide holes which are used for being inserted into one of the guide posts and are in sliding fit with the guide posts are formed in the bottom of the sliding groove respectively, a plurality of sawteeth distributed from left to right are arranged on the upper end surface of the sliding block, a plurality of tooth sockets distributed from left to right are arranged on the lower end surface of a clamping block, and the sawteeth; two first springs which are symmetrically arranged left and right are embedded between the sliding block and the clamping seat, the bottom of the sliding groove is provided with insertion holes into which the lower end part of one of the first springs is inserted, the lower end of each first spring abuts against the bottom of the insertion hole, and the upper end of each first spring abuts against the lower end surface of the sliding block; after adopting this kind of locking mechanism, when the clamp splice moved to vertical limit one side, under the mating action of sawtooth and tooth's socket, the sawtooth at first can be deviate from in the tooth's socket, then block into next tooth's socket again, and when the clamp splice need move to the one side of keeping away from vertical limit, under the mating action of sawtooth and tooth's socket, the clamp splice can't move towards the one side of keeping away from vertical limit, and the clamp splice can be in the state by the chucking promptly.

The invention relates to a cross arm component for supporting a power line, wherein an unlocking mechanism comprises a first slide bar, a second slide bar and a rotating block, a first slide hole with an opening at the lower end is vertically arranged in the middle of a clamping block, a second slide hole with an opening at the left end is transversely arranged in the clamping block, the upper end of the first slide hole is communicated with the second slide hole, the first slide bar is arranged in the first slide hole and is in sliding connection with the first slide hole, the second slide bar is arranged in the second slide hole and is in sliding connection with the second slide hole, a first annular convex edge is arranged on the outer peripheral wall of the first slide bar, a first slide cavity with an opening at the lower end and used for the first annular convex edge to slide is arranged on the inner peripheral wall of the first slide hole, a first check ring is embedded in the opening at the lower end of the first slide cavity, a second spring is sleeved outside the first slide bar between the first annular convex edge and the first check ring, and two ends of the second spring are respectively abutted against the first annular convex edge and the first check, the lower end of the first sliding rod is movably arranged in the first check ring in a penetrating mode, a second annular convex edge is arranged on the outer peripheral wall of the second sliding rod, a second sliding cavity with an opening at the left end is formed in the inner peripheral wall of the second sliding hole and used for the second annular convex edge to slide, a second check ring is fixedly embedded at the opening at the left end of the second sliding cavity, a third spring is sleeved outside the second sliding rod between the second annular convex edge and the inner bottom of the second sliding cavity, two ends of the third spring are respectively abutted against the second annular convex edge and the inner bottom of the second sliding cavity, the left end of the second sliding rod movably penetrates through the second check ring and then extends out of the second check ring, a first inclined surface is arranged at the upper end of the first sliding rod, and a second inclined surface used for being attached to the first inclined surface is arranged at the inner end of the; the turning block is rotatably connected with the clamping block, the outer end face of the second slide bar is a spherical face, a concave face for embedding the outer end part of the second slide bar is arranged on the outer wall of the turning block, a first convex edge is arranged on the outer wall of the turning block, the first convex edge is used for being abutted against the second slide bar after the outer end part of the second slide bar is embedded with the concave face, a plane for being abutted against the outer end part of the second slide bar after the turning block rotates clockwise 90 degrees is arranged on the outer wall of the turning block, a second convex edge is arranged on the outer wall of the turning block, the second convex edge is used for being abutted against the second slide bar after the outer end part of the second slide bar is abutted against the plane, a slope is arranged on the outer wall face of the turning block between the concave face and the plane, when the turning block rotates, the slope is used for sliding the outer end part of the; after the unlocking mechanism is adopted, when the rotating handle is operated to enable the rotating block to rotate 90 degrees clockwise, the outer end part of the second slide rod can be separated from the concave surface and can finally abut against the plane, at the moment, the second slide rod can be pushed rightwards, the second slide rod is pushed rightwards, under the matching action of the second inclined surface and the first inclined surface, the first slide rod can be pushed downwards, at the moment, the first slide rod can push the slide block to enable the slide block to move downwards, after the slide block moves downwards, the sawteeth on the slide block can be separated from the tooth grooves on the lower end surface of the clamping block, at the moment, the unlocking can be carried out between the slide block and the clamping block, namely, the clamping block can be moved leftwards, and therefore, the clamping block and the vertical edge can release clamping; under the above-mentioned state, after operation turning handle makes the turning block anticlockwise rotate 90 degrees, the outer tip of second slide bar can break away from the plane and slide along domatic, the outer tip of second slide bar finally can be with concave surface gomphosis again, at this moment, under the effect of third spring, can make the outside removal of second slide bar reset, can make first slide bar shift up reset under the effect of second spring, can make slider rebound under the effect of first spring, the slider rebound back, can make the sawtooth again with the tooth's socket block of clamp splice bottom, so, the locking to the clamp splice has been realized again (above-mentioned first retaining ring and second retaining ring all with clamp splice scarf joint or welded fastening).

The invention relates to a cross arm assembly for supporting a power line, wherein the front side and the rear side of a rotating block are both provided with lugs, the lugs are connected with a clamping block into a whole, and the rotating block is rotatably connected with the lugs through rotating shafts arranged in the lugs and the rotating block in a penetrating way; by adopting the structure, the rotating block can be reliably and rotatably connected with the clamping block.

The invention relates to a cross arm assembly for supporting a power line, wherein bosses are arranged on the front side and the rear side of the lower end of a clamping block, rail grooves are arranged on the inner walls of clamping seats positioned on the front side and the rear side of the clamping block, and each boss is respectively connected with the rail groove on the corresponding side in a sliding manner; by adopting the structure, the clamping block can be reliably connected with the clamping seat in a sliding way.

The cross arm assembly for supporting the power line is characterized in that a nut is embedded in a ceramic base, the ceramic base and the cross arm are fastened through a first bolt, the first bolt is movably arranged in the cross arm in a penetrating mode, and the first bolt is in threaded connection with the nut; by adopting such a structure, the ceramic base can be reliably fixed to the cross arm.

The cross arm assembly for supporting the power line is characterized in that a plurality of countersunk holes which are uniformly distributed in the circumferential direction are formed in the ceramic base, a second bolt is arranged in each countersunk hole, the clamping base and the ceramic base are fastened through the second bolts, and the second bolts are in threaded connection with the clamping base; by adopting the structure, the clamping seat can be reliably fixed on the ceramic base.

When the power line cross arm assembly is used, two anchor ears can be fixed on the power line rod body only by using two bolt assemblies, namely, the cross arm and the power line rod body can be fixed, so that the power line cross arm assembly has the advantage of convenience in fixing with the power line rod body compared with the traditional power line cross arm assembly on the market.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic top view of the cross arm, the hoop and the power rod body after being fixed;

fig. 2 is a left side view structural schematic diagram of the power line supporting device, the cross arm, and the hoop fixed to the power rod body;

fig. 3 is a left side view of the power line supporting device;

fig. 4 is a schematic sectional view of the power line supporting apparatus after clamping the power line;

FIG. 5 is an enlarged view of the structure at A in FIG. 4;

FIG. 6 is an enlarged view of the structure at B in FIG. 4;

fig. 7 is a schematic structural view of the rotating block in fig. 4 after rotating clockwise by 90 degrees.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The cross arm assembly for supporting the power line comprises two hoops 30 which are clamped on a power line rod body 20, wherein the two hoops 30 are respectively positioned at the left side and the right side of the power line rod body 20, and the front ends and the rear ends of the two hoops 30 are fastened with each other through a bolt assembly 40; all welded fastening has the cross arm 4 of "pi" font on the outer terminal surface of every staple bolt 30, all is fixed with a plurality of power line strutting arrangement on every cross arm 4, and every cross arm 4 all welded fastening with the staple bolt 30's of corresponding side junction has two to be the stiffener 301 of symmetry setting around.

Each power line supporting device comprises a clamping seat 1, a clamping block 2 and a ceramic base 3, the lower end of the ceramic base 3 is fixed on a cross arm 4, the clamping seat 1 is fixed at the upper end of the ceramic base 3, the clamping block 2 is connected to the clamping seat 1 in a sliding mode, the right end of the clamping seat 1 is provided with an upward extending vertical edge 11, the clamping block 2 is used for clamping a power line 5 on the vertical edge 11, a first recess 12 used for enabling the power line 5 to be partially embedded is formed in the inner wall of the vertical edge 11, and a second recess 21 used for enabling the power line 5 to be partially embedded is formed in the right end of the clamping block 2; a locking mechanism for locking the clamping block 2 is arranged between the clamping block 2 and the clamping seat 1, and an unlocking mechanism for unlocking the clamping block 2 is arranged on the clamping block 2; after the power line supporting device is adopted, the power line supporting device can conveniently clamp the power line, namely, the power line can be conveniently fixed on the cross arm, and therefore convenience can be brought to fixing and laying of the power line.

The locking mechanism comprises a sliding block 6, a sliding groove 13 is arranged at the inner bottom of the clamping seat 1, the sliding block 6 is connected in the sliding groove 13 in a sliding manner, two guide posts 61 which are symmetrically arranged left and right are integrally formed on the lower end face of the sliding block 6, a guide hole 14 which is used for being inserted by one guide post 61 and is in sliding fit with the guide post 61 is arranged at the bottom of the sliding groove 13, a plurality of sawteeth 62 which are distributed from left to right are arranged on the upper end face of the sliding block 6, a plurality of tooth sockets 22 which are distributed from left to right are arranged on the lower end face of the clamping block 2, and the sawteeth 62; two first springs 7 which are arranged in bilateral symmetry are embedded between the sliding block 6 and the clamping seat 1, the bottom of the sliding groove 13 is provided with an insertion hole 15 into which the lower end of one of the first springs 7 is inserted, the lower end of each first spring 7 abuts against the bottom of the insertion hole 15, and the upper end of each first spring 7 abuts against the lower end face of the sliding block 6; after adopting this kind of locking mechanism, when the clamp splice moved to vertical limit one side, under the mating action of sawtooth and tooth's socket, the sawtooth at first can be deviate from in the tooth's socket, then block into next tooth's socket again, and when the clamp splice need move to the one side of keeping away from vertical limit, under the mating action of sawtooth and tooth's socket, the clamp splice can't move towards the one side of keeping away from vertical limit, and the clamp splice can be in the state by the chucking promptly.

The unlocking mechanism comprises a first slide bar 8, a second slide bar 9 and a rotating block 10, a first slide hole 23 with an opening at the lower end is vertically arranged in the middle of a clamping block 2, a second slide hole 24 with an opening at the left end is transversely arranged in the clamping block 2, the upper end of the first slide hole 23 is communicated with the second slide hole 24, the first slide bar 8 is arranged in the first slide hole 23 and is in sliding connection with the first slide hole 23, the second slide bar 9 is arranged in the second slide hole 24 and is in sliding connection with the second slide hole 24, a first annular convex edge 81 is arranged on the outer peripheral wall of the first slide bar 8, a first slide cavity 231 with an opening at the lower end and used for the sliding of the first annular convex edge 81 is arranged on the inner peripheral wall of the first slide hole 23, a first retaining ring 232 is embedded at the opening at the lower end of the first slide cavity 231, a second spring 82 is sleeved outside the first slide bar 8 between the first annular convex edge 81 and the first retaining ring 232, and two ends of the second spring 82 are respectively abutted against the first annular convex edge 81 and the first retaining ring, the lower end of the first slide bar 8 is movably arranged in the first retaining ring 232 in a penetrating manner, a second annular convex edge 91 is arranged on the outer peripheral wall of the second slide bar 9, a second sliding cavity 241 with an opening at the left end and used for allowing the second annular convex edge 91 to slide is arranged on the inner peripheral wall of the second sliding hole 24, a second retaining ring 242 is fixedly embedded at the opening at the left end of the second sliding cavity 241, a third spring 92 is sleeved outside the second slide bar 9 between the second annular convex edge 91 and the inner bottom of the second sliding cavity 241, two ends of the third spring 92 respectively abut against the inner bottoms of the second annular convex edge 91 and the second sliding cavity 241, the left end of the second slide bar 9 movably penetrates through the second retaining ring 242 and then extends out of the second retaining ring 242, a first inclined surface 83 is arranged at the upper end of the first slide bar 8, and a second inclined surface 93 used for abutting against the first inclined surface 83 is arranged at the inner end of the second; the rotating block 10 is rotatably connected with the clamping block 2, the outer end face of the second slide bar 9 is a spherical face, a concave face 101 for embedding the outer end part of the second slide bar 9 is arranged on the outer wall of the rotating block 10, a first convex edge 102 is arranged on the outer wall of the rotating block 10, the first convex edge 102 is used for abutting against the second slide bar 9 after the outer end part of the second slide bar 9 is embedded with the concave face 101, a plane 103 for abutting against the outer end part of the second slide bar 9 after the rotating block 10 rotates clockwise 90 degrees is arranged on the outer wall of the rotating block 10, a second convex edge 104 is arranged on the outer wall of the rotating block 10, the second convex edge 104 is used for abutting against the second slide bar 9 after the outer end part of the second slide bar 9 abuts against the plane 103, a slope 105 is arranged on the outer wall face of the rotating block 10 between the concave face 101 and the plane 103, when the, the slope surface 105 is used for sliding the outer end part of the second sliding rod 9, and a rotating handle 106 is integrally formed on the outer wall of the rotating block 10; after the unlocking mechanism is adopted, when the rotating handle is operated to enable the rotating block to rotate 90 degrees clockwise, the outer end part of the second slide rod can be separated from the concave surface and can finally abut against the plane, at the moment, the second slide rod can be pushed rightwards, the second slide rod is pushed rightwards, under the matching action of the second inclined surface and the first inclined surface, the first slide rod can be pushed downwards, at the moment, the first slide rod can push the slide block to enable the slide block to move downwards, after the slide block moves downwards, the sawteeth on the slide block can be separated from the tooth grooves on the lower end surface of the clamping block, at the moment, the unlocking can be carried out between the slide block and the clamping block, namely, the clamping block can be moved leftwards, and therefore, the clamping block and the vertical edge can release clamping; under the above-mentioned state, after operation turning handle makes the turning block anticlockwise rotate 90 degrees, the outer tip of second slide bar can break away from the plane and slide along domatic, the outer tip of second slide bar finally can be with concave surface gomphosis again, at this moment, under the effect of third spring, can make the outside removal of second slide bar reset, can make first slide bar shift up reset under the effect of second spring, can make slider rebound under the effect of first spring, the slider rebound back, can make the sawtooth again with the tooth's socket block of clamp splice bottom, so, the locking to the clamp splice has been realized again (above-mentioned first retaining ring and second retaining ring all with clamp splice scarf joint or welded fastening).

The front side and the rear side of the rotating block 10 are both provided with lugs 25, the lugs 25 are connected with the clamping block 2 into a whole, and the rotating block 10 is rotatably connected with the lugs 25 through rotating shafts 107 arranged in the lugs 25 and the rotating block 10 in a penetrating way; by adopting the structure, the rotating block can be reliably and rotatably connected with the clamping block.

Bosses 26 are arranged on the front side and the rear side of the lower end of the clamping block 2, rail grooves 16 are arranged on the inner walls of the clamping seats 1 on the front side and the rear side of the clamping block 2, and each boss 26 is connected with the rail groove 16 on the corresponding side in a sliding manner; by adopting the structure, the clamping block can be reliably connected with the clamping seat in a sliding way.

The nut 31 is embedded in the ceramic base 3, the ceramic base 3 and the cross arm 4 are fastened through the first bolt 41, the first bolt 41 is movably arranged in the cross arm 4 in a penetrating mode, and the first bolt 41 is in threaded connection with the nut 31; by adopting such a structure, the ceramic base can be reliably fixed to the cross arm.

A plurality of countersunk holes 32 which are uniformly distributed in the circumferential direction are formed in the ceramic base 3, a second bolt 33 is arranged in each countersunk hole 32, the clamping base 1 and the ceramic base 3 are fastened through the second bolts 33, and the second bolts 33 are in threaded connection with the clamping base 1; by adopting the structure, the clamping seat can be reliably fixed on the ceramic base.

When the power line needs to be clamped, the concave surface on the rotating block is in a state of being embedded with the outer end part of the second sliding rod, then the power line is placed between the clamping block and the vertical side, then the rotating handle on the rotating block is held, the clamping block is pushed rightwards, and after the clamping block is pushed rightwards to be in place, the clamping block and the vertical side can clamp the power line (at the moment, the power line can be clamped between the first recess and the second recess), meanwhile, after the rotating handle is released, the clamping block can be prevented from moving leftwards under the matching action of the saw teeth and the tooth grooves, and the clamping block and the vertical side can be kept in a clamping state on the power line; when the power line needs to be unlocked, the rotating handle is held and clockwise rotated by 90 degrees, at the moment, the outer end part of the second slide bar can be separated from the concave surface and slides to the plane along the slope surface, so the second slide bar can be pushed rightwards, the second slide bar is pushed rightwards, under the matching action of the second slope surface and the first slope surface, the first slide bar can be pushed downwards, at the moment, the first slide bar can push the slide block to enable the slide block to move downwards, after the slide block moves downwards, the sawteeth on the slide block can be separated from the tooth grooves on the lower end surface of the clamping block, at the moment, the unlocking can be carried out between the slide block and the clamping block, namely, the clamping block can be moved leftwards by pulling the rotating handle, and therefore, the clamping of the power line can.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A cross arm assembly for supporting a power line, comprising: the electric power pole comprises two hoops (30) which are used for being clamped on an electric power pole body (20), wherein the two hoops (30) are respectively positioned on the left side and the right side of the electric power pole body (20), and the front ends and the rear ends of the two hoops (30) are mutually fastened through a bolt component (40); all welded fastening has cross arm (4) of "pi" font on the outer terminal surface of every staple bolt (30), all is fixed with a plurality of power line strutting arrangement on every cross arm (4), and every cross arm (4) and the junction of staple bolt (30) of corresponding side all welded fastening have two stiffener (301) that are symmetrical setting from beginning to end.

2. The cross arm assembly for supporting power lines according to claim 1, wherein each power line supporting device comprises a clamping seat (1), a clamping block (2) and a ceramic base (3), the lower end of the ceramic base (3) is fixed on the cross arm (4), the clamping seat (1) is fixed at the upper end of the ceramic base (3), the clamping block (2) is slidably connected on the clamping seat (1), the right end of the clamping seat (1) is provided with an upward extending vertical edge (11), the clamping block (2) is used for clamping the power line (5) on the vertical edge (11), a first recess (12) for partially embedding the power line (5) is arranged on the inner wall of the vertical edge (11), and a second recess (21) for partially embedding the power line (5) is arranged on the right end of the clamping block (2); a locking mechanism used for locking the clamping block (2) is arranged between the clamping block (2) and the clamping base (1), and an unlocking mechanism used for unlocking the clamping block (2) is installed on the clamping block (2).

3. The cross arm assembly for supporting a power line according to claim 2, wherein the locking mechanism comprises a sliding block (6), a sliding groove (13) is formed in the inner bottom of the clamping seat (1), the sliding block (6) is slidably connected in the sliding groove (13), two guide posts (61) which are arranged in a bilateral symmetry manner are integrally formed on the lower end surface of the sliding block (6), guide holes (14) which are used for allowing one guide post (61) to be inserted into and to be in sliding fit with the guide posts (61) are formed in the bottom of the sliding groove (13), a plurality of saw teeth (62) which are distributed from left to right are formed in the upper end surface of the sliding block (6), a plurality of tooth sockets (22) which are distributed from left to right are formed in the lower end surface of the clamping block (2), and the saw teeth (62) are used for being clamped with the tooth sockets (22); two first springs (7) which are arranged in bilateral symmetry are embedded between the sliding block (6) and the clamping seat (1), insertion holes (15) which are used for inserting the lower end parts of one first spring (7) are formed in the bottom of the sliding groove (13), the lower end of each first spring (7) abuts against the bottom of the insertion hole (15), and the upper end of each first spring (7) abuts against the lower end face of the sliding block (6).

4. The cross arm assembly for supporting a power line according to claim 3, wherein the unlocking mechanism comprises a first slide rod (8), a second slide rod (9) and a rotating block (10), a first slide hole (23) with an open lower end is vertically arranged in the middle of the clamping block (2), a second slide hole (24) with an open left end is transversely arranged in the clamping block (2), the upper end of the first slide hole (23) is communicated with the second slide hole (24), the first slide rod (8) is arranged in the first slide hole (23) and is slidably connected with the first slide hole (23), the second slide rod (9) is arranged in the second slide hole (24) and is slidably connected with the second slide hole (24), a first annular convex edge (81) is arranged on the outer peripheral wall of the first slide rod (8), a first slide cavity (231) with an open lower end and is provided on the inner peripheral wall of the first slide hole (23) and is used for sliding the first annular convex edge (81), a first check ring (232) is fixedly embedded at an opening at the lower end of the first sliding cavity (231), a second spring (82) is sleeved outside the first sliding rod (8) between the first annular convex edge (81) and the first check ring (232), two ends of the second spring (82) are respectively abutted against the first annular convex edge (81) and the first check ring (232), the lower end of the first sliding rod (8) is movably arranged in the first check ring (232) in a penetrating manner, a second annular convex edge (91) is arranged on the outer peripheral wall of the second sliding rod (9), a second sliding cavity (241) with an open left end and used for the sliding of the second annular convex edge (91) is arranged on the inner peripheral wall of the second sliding hole (24), a second check ring (242) is fixedly embedded at an opening at the left end of the second sliding cavity (241), and a third spring (92) is sleeved outside the second sliding rod (9) between the second annular convex edge (91) and the inner bottom of the second sliding cavity (241), two ends of the third spring (92) are respectively abutted against the second annular convex edge (91) and the inner bottom of the second sliding cavity (241), the left end of the second sliding rod (9) movably penetrates through the second check ring (242) and then extends out of the second check ring (242), the upper end of the first sliding rod (8) is provided with a first inclined surface (83), and the inner end of the second sliding rod (9) is provided with a second inclined surface (93) which is used for being attached to the first inclined surface (83); the rotating block (10) is rotatably connected with the clamping block (2), the outer end face of the second sliding rod (9) is a spherical face, a concave face (101) for embedding the outer end portion of the second sliding rod (9) is arranged on the outer wall of the rotating block (10), a first convex edge (102) is arranged on the outer wall of the rotating block (10), the first convex edge (102) is used for abutting against the second sliding rod (9) after the outer end portion of the second sliding rod (9) is embedded with the concave face (101), a plane (103) which is used for abutting against the outer end portion of the second sliding rod (9) after the rotating block (10) rotates clockwise 90 degrees is arranged on the outer wall of the rotating block (10), a second convex edge (104) is arranged on the outer wall of the rotating block (10), and the second convex edge (104) is used for abutting against the second sliding rod (9) after the outer end portion of the second sliding rod (9) abuts against the plane (103), a slope surface (105) is arranged on the outer wall surface of the rotating block (10) between the concave surface (101) and the plane (103), when the rotating block (10) rotates, the slope surface (105) is used for enabling the outer end part of the second sliding rod (9) to slide, and a rotating handle (106) is integrally formed on the outer wall of the rotating block (10).

5. The cross arm assembly for supporting a power line according to claim 4, wherein the front side and the rear side of the rotary block (10) are provided with lugs (25), the lugs (25) are connected with the clamping block (2) into a whole, and the rotary block (10) is rotatably connected with the lugs (25) through rotating shafts (107) arranged in the lugs (25) and the rotary block (10) in a penetrating manner.

6. The cross arm assembly for supporting an electric power line according to claim 2, wherein the front and rear sides of the lower end of the clamping block (2) are provided with bosses (26), the inner walls of the clamping seats (1) located at the front and rear sides of the clamping block (2) are provided with rail grooves (16), and each boss (26) is slidably connected with the rail groove (16) of the corresponding side.

7. The cross arm assembly for supporting an electric power line according to claim 2, wherein a nut (31) is embedded inside the ceramic base (3), the ceramic base (3) and the cross arm (4) are fastened by a first bolt (41), the first bolt (41) is movably inserted into the cross arm (4), and the first bolt (41) is in threaded connection with the nut (31).

8. The cross arm assembly for supporting a power line according to claim 2, wherein the ceramic base (3) is provided with a plurality of uniformly circumferentially distributed counter bores (32) inside, each counter bore (32) is provided with a second bolt (33), the clamping base (1) and the ceramic base (3) are fastened through the second bolts (33), and the second bolts (33) are in threaded connection with the clamping base (1).