CN206545481U - High voltage operations folding ladder - Google Patents

Abstract

The utility model provides a kind of high voltage operations folding ladder.The folding ladder includes ladder, stow-away arm rest, two fixed handrails and two voltage equalizing balls；Wherein, the end of ladder is connected with ground and Measuring error device respectively；Fixed handrail is connected with the lower end of ladder；Stow-away arm rest is located at the upper end of fixed handrail；Stow-away arm rest includes crossbeam and two armrest supports；The first end of two armrest supports is connected by crossbeam, and the second end is detachably connectable with two voltage equalizing balls respectively；The length of crossbeam is more than the distance of two fixed handrails；Two armrest supports are respectively placed in the both sides of two fixed handrails and are rotationally connected with two fixed handrails；When circuit is run, crossbeam is in contact with fixed handrail.The folding ladder that the utility model is provided is when circuit is run, and crossbeam blocks the climbing of children or felo-de-se, and voltage equalizing ball increases the radius of curvature on folding ladder top, solves the problem of corona discharge occurs for high voltage operations ladder top under hyperbaric environment.

Description

High-voltage operation folding ladder

Technical Field

The utility model relates to a power maintenance technical field particularly, relates to a high voltage operation folding ladder.

Background

When working aloft near high-voltage lines or in a high-voltage environment, a ladder is often needed. At high voltage, near the electrode with a small radius of curvature around the electric field, air is dissociated to generate discharge, thereby forming corona. Because the electric field is very weak at the periphery of the corona and no collision ionization occurs, the charged particles at the periphery of the corona are basically ions, and the ions form a corona discharge current. Because the voltage of the working area above the ladder is high, the phenomenon of corona discharge often appears at the part with small curvature radius of the top end of the ladder. When corona discharge occurs, not only halation but also sound of discharge occurs, so that the corona discharge causes loss of electric energy and interference with television broadcasting.

In addition, in order to facilitate climbing and personnel protection of the ladder, both sides of the existing ladder are provided with fixed handrails. But fixed handrail has been convenient for other personnel's climbing simultaneously, and under high-voltage environment, personnel are close to and can take place to electrocute danger, so just caused children or suicide's bodily injury.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a high voltage operation folding ladder aims at solving current ladder top and takes place corona discharge and unsafe problem.

One aspect, the utility model provides a high voltage operation folding ladder, the device includes: the ladder comprises a ladder frame, a folding handrail, two fixed handrails and two pressure-equalizing balls; the end part of the ladder frame is respectively connected with the ground and the detection and maintenance device; the two fixed handrails are positioned at the lower end of the ladder frame and connected with the ladder frame; the folding handrails are positioned at the upper ends of the two fixed handrails; the folding handrail comprises a cross beam and two handrail supports; the first ends of the two armrest supports are connected through the cross beam, and the second ends of the two armrest supports are detachably connected with the two pressure equalizing balls respectively; the length of the cross beam is greater than the distance between the two fixed armrests; the two handrail supports are respectively arranged on two sides of the two fixed handrails and are rotatably connected with the two fixed handrails; when the line runs, the cross beam is in contact with the two fixed handrails and used for blocking people from climbing; when the circuit is maintained, the cross beam is in contact with the detection and maintenance device and is used for supporting the handrail support.

Further, the above armrest support includes: a handrail frame and a supporting frame; one end of the handrail frame is rotatably connected with the fixed handrail, and the other end of the handrail frame is detachably connected with the pressure equalizing ball; one end of the support frame is rotatably connected with the joint of the armrest frame and the fixed armrest, and the other end of the support frame is fixedly connected with the cross beam.

Further, the above armrest support includes: the first support, the second support and the armrest frame; wherein a first end of the first bracket is connected with a first end of the second bracket, and a second end of the first bracket is connected with the armrest frame; the second end of the second support is connected with the first end of the armrest frame, and the first support, the second support and the armrest frame enclose a triangle; the second end of the armrest frame is arranged outside the triangle and is detachably connected with the pressure equalizing ball; the cross beam is fixedly connected to the joint of the first support and the second support.

Furthermore, the pressure equalizing ball is provided with a groove matched with the second end of the armrest frame; the second end of the armrest frame is clamped in the groove.

Furthermore, the pressure-equalizing ball is a hollow ball body, and the pressure-equalizing ball is provided with an opening matched with the second end of the armrest frame; the second end of the armrest frame penetrates through the opening and is sleeved in the pressure-equalizing ball.

Further, the opening is a circular hole with a diameter larger than that of the second end of the armrest frame.

Furthermore, the pressure-equalizing ball is connected with the fixed armrest through a connecting piece, and the connecting piece is used for fixing the pressure-equalizing ball.

Further, the connecting piece is a lead wire rope.

Furthermore, the cross beam is detachably connected with the detection and maintenance device through a bolt.

The utility model provides a high voltage operation folding ladder, when the circuit operation, folding handrail rotates to the crossbeam and contacts with fixed handrail, and the crossbeam can block children or suicide's climbing, has reduced the dangerous possibility of electric shock around the high-tension line, has solved the insecurity problem that high voltage operation ladder brought. Meanwhile, the voltage-sharing ball is connected with the tip part of the top of the high-voltage operation folding ladder, so that the curvature radius of the tip part of the high-voltage operation folding ladder is increased, and the problem of corona discharge at the top of the high-voltage operation ladder in a high-voltage environment is solved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic side view of a high voltage operation folding ladder according to an embodiment of the present invention when operating at high voltage;

fig. 2 is a schematic front structural view of the high voltage operation folding ladder provided by the embodiment of the present invention when operating at high voltage;

fig. 3 is a schematic side view of the high voltage operation folding ladder according to the embodiment of the present invention during line maintenance;

fig. 4 is a schematic front structural view of the high voltage operation folding ladder provided by the embodiment of the present invention during line maintenance;

fig. 5 is a schematic structural view of the voltage-sharing ball in the high-voltage operation folding ladder according to the embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1, fig. 1 is a schematic side structure diagram of a high voltage operation folding ladder provided by an embodiment of the present invention when operating at high voltage. As shown, the high voltage operation folding ladder comprises: a ladder frame 5, a folding handrail 1, two fixed handrails 2 and two pressure-equalizing balls 3, the folding handrail 1 being located at the upper end of the fixed handrail 2 (with respect to the position shown in fig. 1). Wherein,

as shown in fig. 1 to 4, the ends of the ladder frame 5 are connected to the ground and the inspection and maintenance device, respectively. In a specific implementation, the ladder frame 5 may be vertically disposed (relative to the position shown in fig. 1) or obliquely disposed (relative to the position shown in fig. 1), and this embodiment does not limit it at all. The bottom end of the ladder frame 5 (relative to the position shown in fig. 1) is connected to the ground and the top end of the ladder frame 5 (relative to the position shown in fig. 1) is connected to the inspection and maintenance device. To further enhance the safety and stability of the folding ladder, the ladder frame 5 may be preferably connected to the ground and the bottom surface of the inspection and maintenance device by welding. It is well known to those skilled in the art that the inspection and maintenance device may be a corona cage or other devices used by a worker in a high voltage environment.

Two fixed handrails 2 are located at the lower end (with respect to the position shown in fig. 1) of the ladder frame 5 and are connected to the ladder frame 5; the folding handrail 1 is located at the upper end of two fixed handrails 2 (with respect to the position shown in fig. 1). In particular, the lower end of the ladder frame 5 (with respect to the position shown in fig. 1) may be welded with two fixed handrails 2. The folding handrail 1 is located at the upper end (with respect to the position shown in fig. 1) of the two fixed handrails 2 and is rotatably connected with the two fixed handrails 2.

The folding handrail 1 includes: a cross beam 11 and two handrail supports 12. First ends (lower right ends as viewed in fig. 1) of the two armrest supports 12 are connected by a cross member 11, and second ends (upper right ends as viewed in fig. 1) of the two armrest supports 12 are detachably connected to the two pressure-equalizing balls 3, respectively. Specifically, the cross member 11 may be disposed horizontally (with respect to the position shown in fig. 2), the two armrest supports 12 may be disposed vertically (with respect to the position shown in fig. 2), and the two armrest supports 12 may be connected by the cross member 11. The armrest support 12 and the cross beam 11 may be integrally formed, and of course, the connection manner of the armrest support 12 and the cross beam 11 may also be other connection manners known to those skilled in the art, such as welding, and the like, and the present embodiment does not limit the connection manner. The second ends (upper right ends as shown in fig. 1) of the two armrest supports 12 are detachably connected with the two pressure-equalizing balls 3, respectively, the two pressure-equalizing balls 3 are detached to be placed when the line is maintained, and the two pressure-equalizing balls 3 are connected with the second ends (upper right ends as shown in fig. 1) of the two armrest supports 12 when the line is operated. Preferably, the pressure equalizing balls 3 may be metal balls. Further preferably, the pressure equalizing balls 3 may be aluminum balls, stainless steel balls, or iron balls, and of course, the pressure equalizing balls 3 may also be spheres made of other materials, which is not limited in this embodiment.

The length of the cross beam 11 is greater than the distance between the two fixed armrests 2. The two handrail supports 12 are respectively disposed on both sides of the two fixed handrails 2 and rotatably connected to the two fixed handrails 2. Specifically, the horizontal length (relative to the position shown in fig. 2) of the cross beam 11 may be greater than the horizontal distance (relative to the position shown in fig. 2) between the two fixed armrests 2, the two armrest supports 12 are respectively disposed at the left and right sides (relative to the position shown in fig. 2) of the two fixed armrests 2, and the two armrest supports 12 may be both rotatably connected with the two fixed armrests 2 by fastening bolts, of course, the connection between the two armrest supports 12 and the two fixed armrests 2 may be connected by other means known to those skilled in the art, such as a connecting rod, etc., and the embodiment is not limited thereto.

As shown in fig. 1 to 2, when the line runs, the cross beam 11 is in contact with two fixed handrails 2 for blocking a person from climbing. Specifically, when the line runs, the beam 11 contacts with two fixed handrails 2, the fixed handrails 2 can support the folding handrail 1 to prevent the folding handrail from rotating, and the beam 11 can block personnel from climbing to a dangerous area of the detection and maintenance device along the folding ladder. Meanwhile, the two pressure equalizing balls 3 are connected to the second ends of the two armrest supports 12.

As shown in fig. 3 to 4, the cross member 11 is in contact with the inspection and maintenance device for supporting the handle support 12 when the line is maintained. Specifically, after the circuit stops running and before the circuit is maintained, two pressure-equalizing balls 3 are detached and placed at other positions, the folding handrail 1 rotates around the joint of the two fixed handrails 2 and the two handrail supports 12, and the folding handrail rotates until the cross beam 11 contacts with the detection and maintenance device. When the line is maintained, the cross beam 11 contacts with the detection and maintenance device, and the detection and maintenance device can support the folding handrail 1 to prevent the folding handrail from rotating.

The working process of the embodiment is as follows: firstly, the folding handrail 1 is rotated until the cross beam 11 is contacted with the fixed handrail 2, and then the two pressure-equalizing balls 3 are respectively connected with the second ends (the upper right ends as shown in figure 1) of the two handrail supports 12, and the circuit runs in the state; when the line needs to be maintained, the line stops running, the two pressure equalizing balls 3 and the second ends (the upper right ends as shown in fig. 1) of the two handrail supports 12 are separated and placed at other positions, then the folded handrail 1 rotates anticlockwise (relative to the direction shown in fig. 1) around the first ends (the lower right ends as shown in fig. 1) of the two handrail supports 12, and after the folded handrail 1 rotates to the state that the cross beam 11 is in contact with the detection maintenance device (as shown in fig. 4), a maintenance person can climb to maintain the line.

Compared with the prior art, the high voltage operation folding ladder that this embodiment provided, when the circuit operation, folding handrail 1 rotates to crossbeam 11 and contacts with fixed handrail 2, and crossbeam 11 can block children or suicide's climbing, has reduced the dangerous possibility of electrocution around the high-tension line, has solved the insecurity problem that high voltage operation ladder brought. Meanwhile, the voltage-sharing balls 3 are connected with the tip of the top of the high-voltage operation folding ladder, so that the curvature radius of the top part of the high-voltage operation folding ladder is increased, and the problem of corona discharge at the top of the high-voltage operation ladder in a high-voltage environment is solved.

In one embodiment of this embodiment, the armrest support 12 may include: a handrail frame and a supporting frame; wherein one end of the handrail frame can be rotatably connected with the fixed handrail 2, and the other end of the handrail frame can be detachably connected with the pressure equalizing ball 3. One end of the support frame can be rotatably connected with the joint of the armrest frame and the fixed armrest 2, and the other end of the support frame can be fixedly connected with the cross beam 11.

In the specific implementation, each handrail support comprises a handrail frame and a support frame, and the folding ladder comprises two handrail supports, namely the folding ladder comprises two handrail frames and two support frames. One end of each handrail frame can be rotatably connected with the two fixed handrails 2 respectively, and the other end of each handrail frame can be detachably connected with the two pressure equalizing balls 3 respectively. One end of each of the two support frames can be respectively and rotatably connected with the joint of the handrail frame and the fixed handrail 2 and the joint of the other handrail frame and the fixed handrail 2. Preferably, for easy replacement and disassembly, one end of the support frame may be connected to the connection between the handle frame and the fixed handle 2 by bolts. The other ends of the two support frames may be fixedly connected with the cross beam 11, and the support frames and the cross beam 11 may be integrally formed, or may be connected in other connection manners known to those skilled in the art, such as welding, and this embodiment does not limit them at all.

It can be seen that, in this embodiment, the length of handrail can be increased to the handrail frame of handrail support 12, has increased the handrail that can climb when maintenance personal climbs to this folding ladder top, has increased maintenance personal's security, moreover, when crossbeam 11 and fixed handrail 12 contact promptly this folding ladder folding back top does not have the handrail can further block children or self killer's climbing to the danger area in detecting the maintenance device. Meanwhile, the armrest frame and the support frame are rotatably connected, so that the installation and the transportation are convenient.

Referring only to fig. 1 to 4, in another embodiment of the present embodiment, the armrest support 12 may include: a first bracket 121, a second bracket 122, and an armrest frame 123. Specifically, both of the right and left armrest supports 12 (with respect to the position shown in fig. 2) may include a first support 121, a second support 122, and an armrest frame 123. Wherein,

a first end (a lower end as viewed in fig. 1) of the first bracket 121 may be connected with a first end (an upper right end as viewed in fig. 1) of the second bracket 122, and a second end (an upper end as viewed in fig. 1) of the first bracket 121 may be connected with the armrest frame 123. The second end (the left lower end as viewed in fig. 1) of the second bracket 122 may be connected to the first end (the left lower end as viewed in fig. 1) of the handle frame 123, and the first bracket 121, the second bracket 122, and the handle frame 123 may enclose a triangle. Specifically, the first bracket 121, the second bracket 122 and the armrest frame 123 are connected two by two to form a triangle. To further increase the strength, it is preferable that the first end (lower end as shown in fig. 1) of the first bracket 121 and the first end (upper right end as shown in fig. 1) of the second bracket 122 enclose a right angle.

The second end (the upper right end as shown in fig. 1) of the armrest frame 123 may be disposed outside the triangle and detachably connected with the pressure-equalizing ball 3, and the cross member 11 may be fixedly connected to the connection portion of the first bracket 121 and the second bracket 122.

Preferably, the left end (relative to the position shown in fig. 2) of the cross beam 11 may be fixedly connected to the joint of the first bracket 121 and the second bracket 122 of the left armrest support 12 (relative to the position shown in fig. 2), and the right end (relative to the position shown in fig. 2) of the cross beam 11 may be fixedly connected to the joint of the first bracket 121 and the second bracket 122 of the right armrest support 12 (relative to the position shown in fig. 2). In specific implementation, the first bracket 121, the second bracket 122 and the armrest frame 123 may be integrally formed, or may be connected by other connection methods known to those skilled in the art, such as welding, and this embodiment does not limit the invention.

In this embodiment, when the line is maintained, not only the cross beam 11 contacts with the detection and maintenance device to support the handrail support 12, but also the second support 122 can support the handrail support 123, so as to reduce the acting force of the climber on the cross beam 11. Meanwhile, the first support 121, the second support 122 and the handrail frame 123 of the handrail support 12 are enclosed into a triangle, so that the strength of the handrail support 11 is increased, and the service life of the folding ladder is prolonged.

In one implementation manner of the above embodiment, the pressure equalizing ball 3 may be provided with a groove matching with the second end (the upper right end shown in fig. 2) of the armrest frame 123, and the second end (the upper right end shown in fig. 2) of the armrest frame 123 may be clamped in the groove. To further increase the stability of the pressure equalizing ball 2, the pressure equalizing ball 2 is provided with a groove matching the second end (the upper right end in fig. 2) of the armrest frame 123, for example, if the second end (the upper right end in fig. 2) of the armrest frame 123 is a cylinder, the groove of the pressure equalizing ball 2 may be a circular groove matching the outer diameter of the cylinder, and the inner diameter of the circular groove may be the same as or slightly larger than the outer diameter of the cylinder.

It can be seen that, in this embodiment, the structure and the connection mode of the pressure equalizing ball 3 and the second end of the armrest frame 123 are simple and easy to implement, and the pressure equalizing ball 3 is convenient to detach and mount.

Referring to fig. 5, fig. 5 is a schematic structural view of the voltage-sharing ball in the high-voltage operation folding ladder according to the embodiment of the present invention. In another embodiment of the above embodiments, as shown in the figure, the pressure equalizing ball 3 is a hollow ball, the pressure equalizing ball 3 is provided with an opening 31 matching with the second end of the armrest frame 123, and the second end of the armrest frame 123 penetrates through the opening 31 and is sleeved in the pressure equalizing ball 3. For simplicity of manufacture, the pressure-equalizing balls 3 may preferably be hollow spheres with a uniform wall thickness.

In this embodiment, the pressure equalizing ball 3 is a hollow ball, which not only enables the pressure equalizing ball 3 to be stably connected to the second end of the armrest frame 123, but also saves materials and manufacturing cost.

Further, in the above embodiment, the opening 31 may be a circular hole having a diameter larger than that of the second end of the handle frame 123. Specifically, the opening 31 may be a circular hole, and the diameter of the circular hole may be larger than the outer diameter of the second end of the handle frame 123. However, the present invention is not limited thereto, and in other embodiments, the opening 31 may have other suitable shapes, such as a square hole.

In the above embodiments, the pressure-equalizing balls 3 are connected to the fixed handrail 2 by the connecting members 4, and the connecting members 4 are used for fixing the pressure-equalizing balls 3. During the concrete implementation, this folding ladder can include two connecting pieces, and the one end of every connecting piece can be connected with a fixed handrail 2 respectively, and the other end of connecting piece 4 can be connected with a ball 4 of equalling pressure respectively. The connecting member 4 may be a retractable rod or a bendable plastic member, which is not limited in this embodiment. When the line is repaired, the two pressure-equalizing balls 3 can be separated from the second end (the upper right end in fig. 1) of the handrail support 123 and hung on both sides of the two fixed handrails 2 through the connecting members 4.

It can be seen that, in the present embodiment, the equalizing ball 3 and the foldable handrail 1 can be directly hung on the fixed handrail 2 after being detached, so that the foldable ladder can prevent the equalizing ball 3 from being lost, and meanwhile, can prevent unsafe accidents caused by the rolling of the equalizing ball 3.

Further, the connecting member 4 may be a cord. Specifically, one end of the lead wire rope may be tied to the fixed handrail 2, and the other end may be inserted into the pressure equalizing ball 3. In order to prevent the uniform pressure balls 3 from falling, the lead wire strings may preferably be metal strings. Further preferably, the lead wire rope may be a steel wire rope, a steel twisted wire rope, an aluminum twisted wire rope steel reinforced, or a copper wire rope. Of course, the lead rope may also be a rope made of other materials, and this embodiment does not limit it at all. In this embodiment, the connecting member 4 can be bent at will, and the length thereof can be changed at will, so that the connecting member 4 is simple to mount, and when the circuit is maintained, the position of the pressure equalizing ball 4 can be adjusted.

In the above embodiments, the cross beam 11 may be detachably connected to the inspection and maintenance device by a latch. Specifically, when the line is maintained, the plug is inserted, and the beam 11 is connected with the detection and maintenance device; after the circuit is maintained and the bolt is pulled out, the beam 11 can be separated from the detection and maintenance device. In this embodiment, during the circuit maintenance, the setting of bolt can further stabilize crossbeam 11 and detection maintenance device fixed connection, can prevent that crossbeam 11 from driving folding handrail 1 and rocking.

The high voltage operation folding ladder provided by the embodiment of the present invention is explained in more detail below.

As shown in fig. 1 to 5, the folding ladder includes a ladder frame 5, a folding handrail 1, two fixed handrails 2, two pressure-equalizing balls 3, and two connecting members 4. The pressure equalizing ball 3 is a hollow ball with uniform wall thickness, the outer diameter of the pressure equalizing ball can be 200-500 mm, the wall thickness of the pressure equalizing ball can be 1-10 mm, preferably, the outer diameter and the wall thickness of the pressure equalizing ball are 400mm and 5mm respectively, and a round hole is formed in the bottom (relative to the direction shown in fig. 5). The ladder frame 5 can be a straight ladder or an inclined ladder, the two fixed handrails 2 are arranged at the lower end of the ladder frame, and the folding handrails 1 are arranged at the upper ends of the fixed handrails. The folding armrest 1 includes two armrest supports 12 and a cross member 11, and the armrest supports 12 include a first support 121, a second support 122, and an armrest frame 123. In order to comprehensively consider the cost and the foldability of the folding handrail, the length of the handrail frame 123 is 0.5-1.7 m, and preferably, the length of the handrail frame 123 is 1 m. The first bracket 121, the second bracket 122 and the armrest frame 123 are connected in pairs in sequence and enclose a right triangle, and the second end (the upper right end as shown in fig. 1) of the armrest frame 123 is arranged outside the triangle. The ends of the cross beam 11 are fixedly connected with the joints of the first support 121 and the second support, and the joints of the first support 121 and the handrail frame 123 are rotatably connected with the fixed handrail 2. The diameter of the round hole formed in the pressure-equalizing ball 3 is 1-50 mm larger than the outer diameter of the third support, preferably, the diameter of the round hole formed in the pressure-equalizing ball 3 is 30mm larger than the outer diameter of the third support, and the second end (the upper right end as shown in fig. 1) of the armrest frame 123 is inserted into the round hole and placed in the pressure-equalizing ball 3. The pressure-equalizing balls 3 can be connected with the fixed handrails 2 through the connecting pieces 4, when the line is maintained, the pressure-equalizing balls 4 are hung on two sides of the ladder frame 5 through the connecting pieces 4, and when the line is operated, the pressure-equalizing balls 3 are connected with the second ends (the upper right ends as shown in fig. 1) of the handrail frames 123. In order to sufficiently bear the weight of the pressure equalizing ball, the connecting member 4 may be a steel wire rope, a steel twisted wire rope, a steel-cored aluminum twisted wire rope or a copper wire rope with a diameter of 1-10 mm, preferably a steel wire rope with a diameter of 5 mm. Corona cage is 70m long, constitute and have 2 layers of middle nets to separate in the middle of two cage bodies by two cage bodies that the cross-section is 10 mx 10m, the corona cage is catenary structure and arranges, when both ends cage body department is apart from ground about 3m, for safe firm, the corona cage is provided with 4 and is 60 this high-pressure operation folding ladders that set up with the bottom surface, ladder frame 5 is the iron material manufacturing, and this folding ladder both ends respectively with bottom surface and corona cage welding, can fix crossbeam 11 and corona cage through the bolt and separate.

To sum up, the high voltage operation folding ladder that this embodiment provided, when the circuit operation, crossbeam 11 and fixed handrail 2 contact and can block children or suicide's climbing, have reduced the dangerous possibility of electrocution around the high-tension line, have solved the insecurity problem that high voltage operation ladder brought. Meanwhile, the voltage-sharing balls 3 are connected with the tip of the top of the high-voltage operation folding ladder, so that the curvature radius of the top part of the high-voltage operation folding ladder is increased, and the problem of corona discharge at the top of the high-voltage operation ladder in a high-voltage environment is solved.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A high voltage operation folding ladder, comprising: the ladder comprises a ladder frame (5), a folding handrail (1), two fixed handrails (2) and two pressure-equalizing balls (3); wherein,

the end part of the ladder frame (5) is respectively connected with the ground and the detection and maintenance device;

the two fixed handrails (2) are positioned at the lower end of the ladder frame (5) and are connected with the ladder frame (5);

the folding handrail (1) is positioned at the upper ends of the two fixed handrails (2);

the folding handrail (1) comprises a cross beam (11) and two handrail supports (12); wherein the first ends of the two armrest supports (12) are connected through the cross beam (11), and the second ends are respectively detachably connected with the two pressure equalizing balls (3);

the length of the cross beam (11) is greater than the distance between the two fixed armrests (2);

the two handrail supports (12) are respectively arranged on two sides of the two fixed handrails (2) and are rotatably connected with the two fixed handrails (2);

when the line runs, the cross beam (11) is in contact with the two fixed handrails (2) and is used for blocking people from climbing;

when the line is maintained, the cross beam (11) is in contact with the detection and maintenance device and is used for supporting the handrail support (12).

2. High voltage service stepladder according to claim 1, characterized in that the handrail support (12) comprises: a handrail frame and a supporting frame; wherein,

one end of the handrail frame is rotatably connected with the fixed handrail (2), and the other end of the handrail frame is detachably connected with the pressure equalizing ball (3);

one end of the supporting frame is rotatably connected with the joint of the armrest frame and the fixed armrest (2), and the other end of the supporting frame is fixedly connected with the cross beam (11).

3. High voltage service stepladder according to claim 1, characterized in that the handrail support (12) comprises: a first bracket (121), a second bracket (122) and an armrest frame (123); wherein,

a first end of the first bracket (121) is connected with a first end of the second bracket (122), and a second end of the first bracket (121) is connected with the armrest frame (123);

the second end of the second bracket (122) is connected with the first end of the handrail frame (123), and the first bracket (121), the second bracket (122) and the handrail frame (123) enclose a triangle;

the second end of the armrest frame (123) is arranged outside the triangle and is detachably connected with the pressure equalizing ball (3);

the cross beam (11) is fixedly connected to the joint of the first bracket (121) and the second bracket (122).

4. A high voltage operating folding ladder according to claim 3,

the pressure equalizing ball (3) is provided with a groove matched with the second end of the armrest frame (123);

the second end of the armrest frame (123) is clamped in the groove.

5. A high voltage operating folding ladder according to claim 3,

the pressure equalizing ball (3) is a hollow ball body, and the pressure equalizing ball (3) is provided with an opening (31) matched with the second end of the armrest frame (123);

the second end of the armrest frame (123) penetrates through the opening (31) and is sleeved in the pressure equalizing ball (3).

6. A high voltage operating stepladder according to claim 5, wherein the opening (31) is a circular hole with a diameter larger than the diameter of the second end of the handrail frame (123).

7. A high voltage service attic ladder as claimed in any one of claims 1 to 6,

the pressure equalizing ball (3) is connected with the fixed handrail (2) through a connecting piece (4), and the connecting piece (4) is used for fixing the pressure equalizing ball (3).

8. A high voltage operating stepladder according to claim 7, wherein the connection (4) is a lead wire.

9. A high voltage service attic ladder as claimed in any one of claims 1 to 6, wherein said cross member (11) is detachably connected to said service detection device by means of a latch.