CN112909871B - High-voltage overhead line electric cross arm - Google Patents

Abstract

The invention provides a power crossarm for high-voltage overhead lines, which includes a mounting frame, an insulator, a shifting chute, a clamping shaft, a clamping rod, a clamping slider, a clamping spring, a displacement mechanism, a positioning mechanism, a support seat and support spring, the present invention solves the problem that the current high-voltage overhead line power cross-arm is often assembled and spliced by a single steel structure truss, and it is difficult to adjust the distance between the insulators according to the actual installed wiring harness specifications to keep it constant The safe distance, and the power cross-arm is often in high-altitude operation when it is installed and fixed, and the number of support frames that need to be assembled and fixed increases, which increases the work intensity and workload of the workers' installation work, and the insulators on the power cross-arm are generally fixed. Installation requires the use of special disassembly tools when it is damaged and needs to be replaced. The manual workload is large, and it is difficult to improve the work efficiency of insulator disassembly and installation operations.

Description

A high-voltage overhead line power crossarm

technical field

The invention relates to the technical field of electric power cross-arms, in particular to a power cross-arm for high-voltage overhead lines.

Background technique

The power cross arm is an important part of the pole tower. The power cross arm is an angle iron fixed horizontally on the top of the utility pole. There is a porcelain bottle on it, which is used to install insulators and fittings to support the wires and lightning conductors and keep them in accordance with regulations. A certain safe distance.

The current power cross-arms of high-voltage overhead lines are often assembled and spliced by a single steel structure truss. After assembly and splicing, the power cross-arms of high-voltage overhead lines are mostly fixed structures, and it is difficult to adjust the distance between insulators according to the actual wiring harness specifications. The distance between them keeps a certain safe distance, and the power cross-arm is often operated at high altitude when it is installed and fixed, and the number of support frames that need to be assembled and fixed is large, which increases the work intensity and workload of workers' installation operations, and the electric power The insulators on the cross-arm are generally installed fixedly. When they are damaged and need to be replaced, special disassembly tools are required. The manual workload is large, and it is difficult to improve the efficiency of disassembly and installation of insulators.

In order to improve the applicability of the power cross-arm of the high-voltage overhead line and ensure the diversity of installation positions of the power cross-arm of the high-voltage overhead line; the invention provides a power cross-arm of the high-voltage overhead line.

Contents of the invention

In order to achieve the above object, the present invention adopts the following technical solutions, a high-voltage overhead line power cross arm, including a mounting frame, an insulator, a shift chute, a snap-in rotating shaft, a snap-in rotating rod, a snap-in slider, a snap-in spring, Shifting mechanism, positioning mechanism, support seat and supporting spring, the side wall of the mounting frame is symmetrically and uniformly provided with shifting chute, the shifting chute is equipped with a shifting mechanism through sliding fit, and the shifting mechanism is fitted through sliding fit The insulator is evenly installed, and the positioning mechanism is installed in the shifting mechanism, and the positioning mechanism is snapped and matched with the insulator. There is a clamping rotating rod, and a clamping slider is symmetrically installed in the clamping rotating rod through a sliding fit. The clamping slider and the clamping rotating rod are connected by a clamping spring, and the clamping slider leans against the On the side wall of the clamping rotating shaft installed on the opposite side, the mounting frame located on the inside of the clamping rotating rod is installed with a support base symmetrically through rotation and left and right, and the support base and the mounting frame are connected by a support spring, and the clamping spring The elastic force makes the snap-in slider located in the snap-in rotating rod and the snap-in rotating shaft on the opposite side snap into each other, so as to realize the snap-fitting of the mounting frames symmetrically installed on both sides of the pole, and realize the connection between the mounting frame and the pole. Preliminary tight positioning between the poles, the set support spring can make the support seat located around the pole closely fit on the side wall of the pole through its own elastic force, and the pole is located in the center of the installation frame through the auxiliary support function, and is set on the The rubber layer on the clamping rotating rod can adapt to the gradual change of the diameter of the electric pole, further improving the stability of the symmetrically installed clamping rotating rod for the clamping of the electric pole.

The displacement mechanism includes a displacement slide seat, a displacement spring, a connecting rod, a displacement rack, a displacement gear, a displacement rotating shaft, a limit slide cylinder, a limit slide block, a limit slide seat, a limit slide Groove, limit spring, limit slide rod and knob. The shift slide seat is evenly installed in the shift chute through sliding fit. The shift slide seat and the mounting frame are connected by a shift spring and located The first shifting slide seat and the third shifting slide seat and the second shifting slide seat and the fourth shifting slide seat in the groove are respectively connected and driven by connecting rods, and the connecting rods located in the mounting frame on one side of the electric pole The number is two, and the inner wall of the connecting rod is symmetrically installed with a shifting rack, and the shifting shaft is installed in the mounting frame inside the shifting rack through rotation, and the lower end of the shifting shaft is installed with a shifting gear through a spline , and the shifting gears are respectively engaged with the shifting racks on both sides for transmission, and the limit slide seat is installed in the mounting frame at the upper end of the shift shaft, and the limit slide seat is located outside the shift shaft and above the limit slide seat The limit slide bar is installed in the installation frame by sliding fit, the upper end of the limit slide bar is installed with a knob, the lower end of the limit slide bar is installed with a limit slide tube, and the limit slide bar located between the limit slide tube and the installation frame A limit spring is set on the rod, the upper end of the displacement shaft is located in the limit slider and the limit slider and the shift shaft are connected by sliding fit, and the outer wall of the limit slider is uniformly equipped with a limit slider, and the limit A limited chute is evenly set up on the sliding seat along its circumferential direction, and the two ends of the connecting rod are connected with the shifting sliding seats distributed at intervals, so the relative movement of the connecting rods symmetrically installed on both sides of the shifting gear can be further driven. The shifting slides located on both sides of the pole move relatively to further adjust the distance between the shifting slides evenly installed on the mounting frame, and further drive the insulators to move to a suitable distance so that they are separated by a certain distance. In order to adapt to the different safety distances required for different wire harness installation operations.

The positioning mechanism includes a positioning drum, a positioning slide, a fixed rod, a return spring, a positioning connecting rod, a connecting chute, a positioning seat, a positioning slider, a positioning spring, a positioning dial, a positioning chute, a clamping slide bar and The clamping chute, the inner side of the shifting slide seat is evenly installed with a positioning drum, the middle part of the lower end of the positioning drum is installed with a fixed rod, and the positioning slider is installed on the fixed rod through sliding fit, and the position between the positioning slider and the positioning drum The outer wall of the positioning slide cylinder is evenly installed with a positioning connecting rod through rotation and fit along its circumferential direction, and the side wall of the positioning drum is uniformly provided with a connecting chute along its circumferential direction, and the middle part of the positioning connecting rod It is located in the connecting chute and the positioning connecting rod is slidingly matched with the positioning drum, and the positioning drum located above the connecting chute is evenly installed with a positioning seat through rotation fit, and the lower end of the positioning seat is connected with the positioning connecting rod through rotating fit , the upper end of the positioning seat is evenly installed with a positioning slider through sliding fit, and the positioning slider and the positioning seat are connected by a positioning spring. The lower end of the insulator is equipped with a positioning turntable, and the side wall of the positioning turntable is uniformly opened There is a positioning chute, and the lower end of the positioning slider abuts against the inner side wall of the positioning chute through sliding fit. The outer wall of the insulator located under the positioning turntable is uniformly provided with a clamping chute along its circumference, and the positioning sliding cylinder located outside the insulator The positioning springs evenly installed with clamping slide rods can make the positioning slider and the positioning chute engage with each other through their own elastic force, so as to realize the clamping and positioning operation of the positioning turntable, and further realize the positioning operation of the insulator. During the process, the clamping and positioning of the height position of the insulator is further realized through the sliding and clamping cooperation between the T-shaped clamping chute at the lower end of the insulator and the clamping slide bar.

Preferably, the number of the installation racks is two, and the installation racks are symmetrically installed on both sides of the electric pole, and the clamping rotating rods on the mounting racks on both sides of the electric pole are installed in an up and down dislocation, and the inner wall of the clamping rotating rod A rubber layer matching the curvature of the outer wall of the electric pole is provided.

Preferably, the cross-section of the upper end of the shift shaft is a regular hexagonal structure, and the limit slider is a regular hexagon slider, the upper end of the shift shaft is located in the limit slider and the shift shaft and the limit slider slide Cooperate.

Preferably, the upper end of the limit sliding seat is evenly provided with a limit chute along its circumference, the limit slide is located inside the limit chute, and the limit slider is slidably engaged with the limit chute.

Preferably, the clamping chute is evenly arranged along the circumference of the lower end side wall of the insulator, and the clamping chute is a T-shaped chute, the end of the clamping slide bar is located in the clamping chute and the clamping slide The rod is a sliding fit with the insulator.

Preferably, the diameter width of the connecting chute is greater than that of the positioning link, and the positioning link can freely rotate synchronously while sliding along the connecting chute.

The beneficial effects of the present invention are:

1. The present invention manually engages the snap-in slider located in the snap-in rotating rod with the snap-in rotating shaft on the opposite side through the elastic force of the snap-in spring, so as to realize mutual snapping of the mounting frames symmetrically installed on both sides of the electric pole Connect to realize the initial tight positioning between the installation frame and the pole. The set support spring can make the support seat located around the pole closely fit on the side wall of the pole through its own elastic force, and make the pole Located in the center of the installation frame, the rubber layer set on the clamping rod can adapt to the gradual change of the diameter of the pole, further improving the stability of the symmetrically installed clamping rod for the clamping of the pole, and reducing manual installation. The workload of supporting work during the later fixing work improves the work efficiency of the installation and fixing work of the installation frame.

2. The shifting mechanism of the present invention can realize the transmission connection and cooperation between the limiting slide bar and the shifting gear through the sliding cooperation between the limiting sliding cylinder and the shifting shaft whose cross-sectional shape is regular hexagonal. The snap fit between the position slider and the limit chute can realize the locking effect on the shift gear, and the two ends of the connecting rod are connected with the shift slide seats distributed at intervals, so it is symmetrically installed on both sides of the shift gear. The relative movement of the connecting rod on the side can further drive the shifting slides located on both sides of the pole to move relatively, further adjust the distance between the shifting slides evenly installed on the mounting frame, and further drive the insulators to move to a suitable position. The distance, so that it is separated by a certain distance, so as to adapt to the different safety distances required for different wiring harness installation operations.

3. The positioning mechanism of the present invention manually installs the insulator into the positioning drum along the upper side wall of the shifting slide seat. During the installation process, the lower end of the insulator further pushes the positioning slide along the fixed rod through the abutting action. Sliding downward, further driving the positioning connecting rod to move downward through the hinge transmission, and synchronously sliding outward along the connecting chute, and further pushing the positioning seat to rotate through the hinge cooperation, so that the upper end of the positioning seat abuts against the position of the positioning turntable On the side wall, after that, the insulator is manually rotated at a certain angle. During the rotation of the insulator, the positioning slider further slides down into the positioning chute through sliding action. The positioning chute is clamped with each other to realize the clamping and positioning operation of the positioning turntable, and further realize the positioning operation of the insulator. During the rotation of the insulator, it is further passed between the T-shaped clamping chute at the lower end of the insulator and the clamping slide bar. The sliding clamping fit realizes the positioning of the height position of the insulator, and the insulators installed through the movable clamping can further improve the operating efficiency of the later maintenance and replacement operations.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the first sectional schematic diagram of Fig. 1 of the present invention;

Fig. 3 is the second sectional schematic diagram of Fig. 1 of the present invention;

Fig. 4 is a partial enlarged schematic diagram of A place in Fig. 2 of the present invention;

Fig. 5 is the schematic diagram of the partial three-dimensional junction of the displacement mechanism of the present invention;

Fig. 6 is a schematic diagram of a partial three-dimensional junction of the positioning mechanism of the present invention.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings. In the process, in order to ensure the clarity and convenience of illustration, we may exaggerate the width of the lines or the size of the constituent elements in the diagram.

In addition, the following terms are defined based on the functions in the present invention, and may be different according to the user's or operator's intention or practice. Therefore, these terms are defined based on the entire content of this specification.

As shown in Figures 1 to 6, a power crossarm for high-voltage overhead lines includes a mounting frame 1, an insulator 2, a shifting chute 3, a clamping shaft 4, a clamping rotating rod 5, a clamping slider 6, a clamping Connect the spring 7, the displacement mechanism 8, the positioning mechanism 9, the support seat 10 and the support spring 11, the number of the mounting frame 1 is two, and the mounting frame 1 is symmetrically installed on both sides of the pole, and the side wall of the mounting frame 1 A shifting chute 3 is symmetrically and evenly opened on the top, left and right, and a shifting mechanism 8 is installed in the shifting chute 3 through a sliding fit. The insulator 2 is evenly installed on the shifting mechanism 8 through a sliding fit. Mechanism 9, and the positioning mechanism 9 and the insulator snap fit, the inner side wall of the mounting frame 1 is symmetrically installed with a snap-in rotating shaft 4 through rotation and cooperation, and the snap-in rotating shaft 4 is equipped with a snap-in rotating rod 5 evenly installed through a spline, The clamping rotating rod 5 on the mounting frame 1 on both sides of the electric pole is installed in a dislocation up and down, and the inner wall of the clamping rotating rod 5 is provided with a rubber layer that matches the curvature of the outer wall of the electric pole. The snap-in slider 6 is symmetrically installed in a sliding fit, and the snap-in slider 6 and the snap-in rotating rod 5 are connected by a snap-in spring 7 and the snap-in slider 6 abuts against the snap-in shaft installed on the opposite side through a sliding fit On the side wall of 4, the mounting frame 1 positioned at the inner side of the clamping rotating rod 5 is equipped with a support base 10 symmetrically by rotating and matching left and right, and the support base 10 and the mounting frame 1 are connected by a support spring 11.

During the specific work, the installation frame 1 is placed symmetrically on both sides of the electric pole manually, and then the side wall of the support base 10 is attached to the side wall of the electric pole for auxiliary support, and then manually rotate the clamp The connecting rod 5 is rotated, and the clamping slider 6 located in the clamping rotating rod 5 is engaged with the clamping rotating shaft 4 on the opposite side through the elastic force of the clamping spring 7, so as to achieve symmetrical installation on both sides of the electric pole. The mounting brackets 1 on the side are clamped with each other, and the set support spring 11 can make the support base 10 located around the pole closely fit on the side wall of the pole through its own elastic force, so that the pole is located in the center of the mounting frame 1, and the setting The rubber layer on the snap-in rotating rod 5 can further improve the stability of the symmetrically installed snap-in rotating rod 5 for the clamping of the electric pole, and then further fix the installation frame 1 and the electric pole through the existing fixing equipment Operation.

The shift mechanism 8 includes a shift slide 8a, a shift spring 8b, a connecting rod 8c, a shift rack 8d, a shift gear 8e, a shift shaft 8f, a limit slide 8g, and a limit slide 8h , limit slide 8j, limit chute 8k, limit spring 8m, limit slide bar 8n and knob 8p, shift slide 8a is evenly installed in shift chute 3 through sliding fit, shift slide 8a It is connected with the installation frame 1 through the displacement spring 8b, and the first displacement slide seat 8a and the third displacement slide seat 8a and the second displacement slide seat 8a and the fourth displacement slide seat 8a located in the displacement chute 3 are connected. The transmission between the bit slides 8a is respectively connected by connecting rods 8c. The number of connecting rods 8c located in the installation frame 1 on one side of the electric pole is two, and the inner wall of the connecting rods 8c is symmetrically equipped with a shifting rack 8d, which is located in the shifting position. The mounting bracket 1 inside the rack 8d is fitted with a shifting shaft 8f through rotation, and the lower end of the shifting shaft 8f is equipped with a shifting gear 8e through a spline, and the shifting gear 8e is connected to the shifting rack 8d on both sides respectively. Mesh transmission, a limit slide 8j is installed in the installation frame 1 located at the upper end of the shift shaft 8f, and the limit slide 8j is located outside the shift shaft 8f, and the installation frame 1 above the limit slide 8j is fitted by sliding A limit slide bar 8n is installed, a knob 8p is installed on the upper end of the limit slide bar 8n, a limit slide cylinder 8g is installed on the bottom end of the limit slide bar 8n, and the limit slide located between the limit slide cylinder 8g and the installation frame 1 The rod 8n is covered with a limit spring 8m, the cross section of the upper end of the shift shaft 8f is a regular hexagonal structure, and the limit slider 8g is a regular hexagon slider, the upper end of the shift shaft 8f is located in the limit slider 8g and shifts The position rotating shaft 8f is slidably matched with the limit slider 8g, the outer wall of the limit slider 8g is uniformly provided with a limit slider 8h, and the upper end of the limit slide seat 8j is uniformly provided with a limit chute 8k along its circumference, and the limit slide 8g is located inside the limiting chute 8k and the limiting slider 8h is slidingly engaged with the limiting chute 8k.

During specific work, after the fixing between the installation frame 1 and the electric pole is completed, the knob 8p is manually lifted up along the installation frame 1, and the limit slider 8g is driven along the displacement shaft 8f by the limit slider 8n. The side wall at the upper end slides upwards, and the limit slider 8h arranged at the lower end of the limit slide cylinder 8g is further moved out of the limit chute 8k. During this process, the limit spring 8m is in a compressed state, and then manually rotated The knob 8p further drives the shift shaft 8f to rotate through the limit slider 8g, and further drives the shift gear 8e to rotate, and the shift gear 8e further drives the shift rack 8d to move through the meshing action, and further drives the connecting rod 8c to move. Move, because the connecting rod 8c is connected with the shifting slides 8a distributed at intervals, the relative movement of the connecting rods 8c installed symmetrically on both sides of the shifting gear 8e further drives the shifting slides 8a located on both sides of the pole to carry out Relatively move, further adjust the distance between the shifting slides 8a, so that it is in a suitable position, after the adjustment is completed, manually loosen the pulling effect on the knob 8p, and then move further under the push of the limit spring 8m elastic reset. Make the limit slider 8g slide down along the displacement shaft 8f, further make the limit slider 8h fall into the limit chute 8k again, and pass the clamp between the limit slider 8h and the limit chute 8k The positioning of the limit sliding cylinder 8g is realized through joint cooperation, and the positioning of the shifting gear 8e is realized through the clamping cooperation between the limiting sliding cylinder 8g and the shifting shaft 8f, and the positioning operation of the shifting slide seat 8a is further realized.

The positioning mechanism 9 includes a positioning drum 9a, a positioning slider 9b, a fixed rod 9c, a return spring 9d, a positioning connecting rod 9e, a connecting chute 9f, a positioning seat 9g, a positioning slider 9h, a positioning spring 9j, and a positioning dial 9k, positioning chute 9m, clamping slide bar 9n and clamping chute 9p, the inner side of shift slide seat 8a is evenly equipped with positioning drum 9a, and the middle part of the lower end of positioning drum 9a is equipped with fixed rod 9c, fixed rod 9c A positioning slider 9b is installed on the top through a sliding fit, and the positioning slider 9b and the positioning drum 9a are connected by a return spring 9d. 9e, the side wall of the positioning drum 9a is uniformly provided with a connecting chute 9f along its circumference, the middle part of the positioning connecting rod 9e is located in the connecting chute 9f and the positioning connecting rod 9e is slidably matched with the positioning drum 9a, and the connecting chute The diameter width of 9f is greater than the diameter width of the positioning connecting rod 9e, and the positioning connecting rod 9e can rotate freely synchronously while sliding along the connecting chute 9f, and is evenly installed on the positioning drum 9a above the connecting chute 9f There is a positioning seat 9g, the lower end of the positioning seat 9g is connected with the positioning connecting rod 9e by rotating fit, the upper end of the positioning seat 9g is evenly equipped with a positioning slide block 9h by sliding fit, and between the positioning slide block 9h and the positioning seat 9g Connected by the positioning spring 9j, the lower end of the insulator 2 is equipped with a positioning turntable 9k, and the side wall of the positioning turntable 9k is evenly provided with a positioning chute 9m along its circumference, and the lower end of the positioning slider 9h leans against the positioning slide through sliding fit. On the inner wall of the slot 9m, the outer wall of the insulator 2 located below the positioning turntable 9k is provided with a clamping chute 9p, which is evenly arranged along the circumference of the lower end side wall of the insulator 2, and the clamping chute 9p is T In the glyph chute, the positioning slider 9b located on the outside of the insulator 2 is evenly equipped with a snap-in slide bar 9n, the end of the snap-in slide bar 9n is located in the snap-in chute 9p and the snap-in slide bar 9n is slidably matched with the insulator 2.

During specific work, after the positioning of the shifting slide 8a is completed, the insulator 2 is manually installed in the positioning drum 9a along the upper side wall of the shifting slide 8a. During the installation, the lower end of the insulator 2 further Push the positioning sliding cylinder 9b to slide downward along the fixed rod 9c through the abutting action, and further drive the inner end of the positioning connecting rod 9e to move downward. During this process, the back-moving spring 9d is in a compressed state. The middle part of the connecting chute is located in the connecting chute 9f. When the inner end of the positioning connecting rod 9e moves downward, the positioning connecting rod 9e starts to slide outward along the side wall of the connecting chute 9f, and further pushes the positioning seat 9g through hinged cooperation. Rotate so that the upper end of the positioning seat 9g abuts against the side wall of the positioning turntable 9k, after that, the insulator 2 is manually rotated by a certain angle, and during the rotation of the insulator 2, the positioning slider 9h further slides down to the positioning position by sliding action. In the chute 9m, the positioning spring 9j provided can make the positioning slider 9h and the positioning chute 9m engage with each other through its own elastic force, so as to realize the clamping and positioning operation of the positioning turntable 9k. During the rotation of the insulator 2, further make the The clamping chute 9p provided at the lower end of the insulator 2 slides along the end of the clamping slide bar 9n, and the height position of the insulator 2 is adjusted through the clamping fit between the clamping slide bar 9n and the clamping chute 9p. Clamping and positioning, after manually completing the installation of the insulator 2 one by one according to these steps, the installation of the entire high-voltage overhead line power cross-arm installation is completed.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. The utility model provides a high tension overhead line electric power cross arm, includes mounting bracket (1), insulator (2), aversion spout (3), joint pivot (4), joint bull stick (5), joint slider (6), joint spring (7), aversion mechanism (8), positioning mechanism (9), supporting seat (10) and supporting spring (11), its characterized in that: the lateral wall of the mounting frame (1) is symmetrically and uniformly provided with shifting chutes (3), shifting mechanisms (8) are installed in the shifting chutes (3) through sliding fit, insulators (2) are evenly installed on the shifting mechanisms (8) through sliding fit, positioning mechanisms (9) are installed in the shifting mechanisms (8), the positioning mechanisms (9) are in clamping fit with the insulators, clamping rotating shafts (4) are installed on the inner side wall of the mounting frame (1) through rotating fit and bilaterally symmetrical, clamping rotating rods (5) are installed on the clamping rotating shafts (4) through splines and uniformly installed through sliding fit, clamping sliding blocks (6) are installed in the clamping rotating rods (5) through sliding fit and symmetrically installed through sliding fit, the clamping sliding blocks (6) are connected with the clamping rotating rods (5) through clamping springs (7), the clamping sliding blocks (6) abut against the lateral wall of the clamping rotating shafts (4) installed on the opposite side through sliding fit, supporting seats (10) are installed on the mounting frame (1) located on the inner side of the clamping rotating rods (5) through rotating fit and bilaterally symmetrical, and the supporting seats (10) are connected with the mounting frame (1) through supporting springs (11); wherein:

the shifting mechanism (8) comprises a shifting slide seat (8 a), a shifting spring (8 b), a connecting rod (8 c), a shifting rack (8 d), a shifting gear (8 e), a shifting rotating shaft (8 f), a limiting slide cylinder (8 g), a limiting slide block (8 h), a limiting slide seat (8 j), a limiting slide groove (8 k), a limiting spring (8 m), a limiting slide rod (8 n) and a knob (8 p), wherein the shifting slide seat (8 a) is uniformly arranged in the shifting slide groove (3) through sliding fit, the shifting slide seat (8 a) and the mounting rack (1) are connected through the shifting spring (8 b), a first shifting slide seat (8 a) and a third shifting slide seat (8 a) which are arranged in the shifting slide groove (3) and a second shifting slide seat (8 a) and a fourth shifting slide seat (8 a) are respectively connected through the connecting rod (8 c) for transmission, the connecting rods (8 c) which are arranged in the mounting rack (1) on one side are two, the shifting rack (8 d) is symmetrically arranged on the inner side wall of the connecting rod (8 c), the shifting rack (8 d) is arranged in the transmission rack (8 d) and the shifting gear (8 e) and is rotatably arranged on the lower end of the shifting rack (8 d) through the rotating shaft (8 e) which is matched with the shifting gear (8 e), a limiting slide seat (8 j) is arranged in an installation rack (1) positioned at the upper end of a shifting rotating shaft (8 f), the limiting slide seat (8 j) is positioned on the outer side of the shifting rotating shaft (8 f), a limiting slide rod (8 n) is arranged in the installation rack (1) positioned above the limiting slide seat (8 j) through sliding fit, a knob (8 p) is arranged at the upper end of the limiting slide rod (8 n), a limiting slide cylinder (8 g) is arranged at the lower end of the limiting slide rod (8 n), a limiting spring (8 m) is sleeved on the limiting slide rod (8 n) positioned between the limiting slide cylinder (8 g) and the installation rack (1), the upper end of the shifting rotating shaft (8 f) is positioned in the limiting slide cylinder (8 g), the limiting slide cylinder (8 g) is connected with the shifting rotating shaft (8 f) through sliding fit, limiting slide blocks (8 h) are uniformly arranged on the outer side wall of the limiting slide cylinder (8 g), and limiting slide grooves (8 k) are uniformly arranged along the circumferential direction of the limiting slide seat (8 j);

the positioning mechanism (9) comprises a positioning rotary drum (9 a), a positioning sliding drum (9 b), a fixing rod (9 c), a reset spring (9 d), a positioning connecting rod (9 e), a connecting sliding groove (9 f), a positioning seat (9 g), a positioning sliding block (9 h), a positioning spring (9 j), a positioning rotary disc (9 k), a positioning sliding groove (9 m), a clamping sliding rod (9 n) and a clamping sliding groove (9 p), wherein the inner side of the shifting sliding seat (8 a) is uniformly provided with the positioning rotary drum (9 a), the middle part of the lower end of the positioning rotary drum (9 a) is provided with the fixing rod (9 c), the fixing rod (9 c) is provided with the positioning sliding drum (9 b) in sliding fit, the positioning sliding drum (9 b) is connected with the positioning rotary drum (9 a) through the reset spring (9 d), the outer side wall of the positioning sliding drum (9 b) is uniformly provided with the positioning connecting rod (9 e) in rotating fit along the circumferential direction, the side wall of the positioning rotary drum (9 a) is uniformly provided with the connecting sliding groove (9 f) along the circumferential direction, the positioning connecting rod (9 e) is positioned in the connecting rod (9 f) and is positioned above the positioning sliding fit with the positioning sliding groove (9 e), the positioning rotary drum (9 g), evenly install location slider (9 h) through sliding fit in the upper end of positioning seat (9 g), and be connected through positioning spring (9 j) between location slider (9 h) and positioning seat (9 g), location carousel (9 k) are installed to the lower extreme of insulator (2), evenly seted up location spout (9 m) along its circumference on the lateral wall of location carousel (9 k), the lower extreme of location slider (9 h) supports through sliding fit and leans on the inside wall of location spout (9 m), joint spout (9 p) have evenly been seted up along its circumference to insulator (2) outer wall that is located location carousel (9 k) below, evenly install joint slide bar (9 n) on location slide cartridge (9 b) that is located the insulator (2) outside.

2. The high voltage overhead line power cross arm of claim 1, wherein: mounting bracket (1) quantity be two, and mounting bracket (1) symmetry is installed in the both sides of pole, joint bull stick (5) that are located on pole both sides mounting bracket (1) are dislocation installation from top to bottom, and the inside wall of joint bull stick (5) be provided with pole outer wall crookedness matched with rubber layer.

3. The high voltage overhead line power cross arm of claim 1, wherein: the cross section of the upper end of the shifting rotating shaft (8 f) is of a regular hexagon structure, the limiting sliding barrel (8 g) is of a regular hexagon structure, the upper end of the shifting rotating shaft (8 f) is located in the limiting sliding barrel (8 g), and the shifting rotating shaft (8 f) is in sliding fit with the limiting sliding barrel (8 g).

4. The high voltage overhead line power cross arm of claim 1, wherein: spacing spout (8 k) have evenly been seted up along its circumference in spacing slide (8 j) upper end, spacing slide (8 g) are located inboard and the spacing slider (8 h) of spacing spout (8 k) and spacing spout (8 k) sliding clamping cooperation.

5. The high voltage overhead line power cross arm of claim 1, wherein: joint spout (9 p) for evenly setting up along the lower extreme lateral wall circumference of insulator (2), and joint spout (9 p) be T font spout, the tip of joint slide bar (9 n) is located joint spout (9 p) and joint slide bar (9 n) and insulator (2) sliding fit.

6. The high voltage overhead line power cross arm of claim 1, wherein: the diameter width of the connecting sliding groove (9 f) is larger than that of the positioning connecting rod (9 e), and the positioning connecting rod (9 e) can synchronously rotate freely while sliding along the connecting sliding groove (9 f).

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