CN106703675A - Portable insulation ladder for power operation and maintenance - Google Patents

Abstract

The invention relates to the technical field of maintenance tools for power systems, and provides a portable insulating ladder for power operation and maintenance, which includes a working platform, a tool placement bracket, a ladder body, an elastic fiber control belt, and a ladder for binding on a carrier The working platform includes two pivoted pedals, each of which has a plurality of through holes, and a snap-fit structure is provided between the pedals; the tool placement bracket includes a fixing plate and a placement plate, and the placement plate is provided with a There are multiple tool storage holes for the tool, and a connection structure is provided between the pedal and the tool placement bracket; the ladder body includes two ladder parts, and each ladder part includes a pillar and a cross bar connected between the pillars. Compared with the prior art, the portable insulating ladder provided by the present invention not only has the advantages of good insulating effect, light weight and high strength, but also greatly improves the safety factor of the operation, and is easy to carry and use, and has a wide range of applications.

Description

Portable insulation ladder for power operation and maintenance

technical field

The invention relates to the technical field of maintenance tools for power systems, in particular to a portable insulating ladder used for power operation and maintenance.

Background technique

Ladders are an important tool in power operation and maintenance work. In actual work, most of the ladders we use are bamboo ladders. In some cases, fiberglass ladders are used. Operation and maintenance personnel use small steel pipe ladders, because the steel pipe ladder itself is a conductor, and the bamboo ladder becomes a conductor when the weather is wet, and electric shock accidents are very likely to occur when personnel are working.

The materials of the currently used ladders are not only bulky, easily damaged and unstable, but also not insulated. Personal electric shock accidents and fall accidents are not uncommon due to lack of insulation and instability, and it brings a lot of inconvenience to users because of its bulkiness.

Contents of the invention

The technical problem to be solved by the present invention is to provide a portable insulating ladder for electric power operation and maintenance, which aims to solve the defects in the prior art that the ladder is too heavy and inconvenient to use and carry.

The invention provides a portable insulating ladder for electric power operation and maintenance, which includes a working platform, a tool placement bracket, a ladder body, and a binding belt for binding on a carrier; the working platform includes two pedals, two A hinge that pivotally connects the two pedals is arranged between the pedals; each pedal includes a rectangular stepping part and an outer frame part connected to the outer periphery of the stepping part, and the stepping part has a plurality of through holes; An engaging structure is provided between the two pedals, and the engaging structure includes at least one positioning protrusion protruding on the side surface of the outer frame of one of the two pedals close to the other pedal and opening on the other pedal. and a positioning groove for at least one positioning protrusion to be embedded in; the tool placement bracket includes a flat plate-shaped fixing plate and a placing plate connected with the fixing plate, and the fixing plate has opposite first sides and second sides , the placing plate is connected to the first side of the fixing plate and is perpendicular to the fixing plate, and the placing plate is provided with a plurality of tool storage holes for placing tools; the pedal and the tool placing bracket A connection structure is provided between them to detachably connect the two, and the connection structure includes an elastic joint part protruding from the second side of the fixing plate and formed on the side wall of the outer frame part for the The positioning hole through which the elastic joint part slides in and out, the inner diameter of the positioning hole is smaller than the cross-sectional size of the elastic joint part; Correspondingly; each of the ladder parts includes two tubular pillars parallel to each other and a plurality of tubular cross bars connected between the two pillars, and the pillars are fixedly connected to the pedals through connecting pieces The binding belt includes a first section with a free end, a second section with a free end, and a transition section connected between the first section and the second section, and the transition section is respectively wound around two On the cross bar of the ladder part, the free end of the first section is provided with a first fastener, and the free end of the second end is provided with a second fastener locked with the first fastener. The portable insulating ladder for electric operation and maintenance also includes an elastic fiber control belt for controlling the pivoting angle of the two pedals, and the elastic fiber control belt is wrapped between the cross bars of the two ladder parts A fiber belt main body, the fiber belt main body has an opposite first end and a second end, the first end is connected with a belt buckle for fastening with the second end.

Further, the plurality of through holes are arranged in a row in the transverse direction of the stepping portion and in the longitudinal direction perpendicular to the transverse direction, and the cross-sectional shape of the through holes is rhombus.

Further, the cross-sectional shape of each of the tool storage holes is circular, and runs through the top surface and the bottom surface of the placement plate, and a plurality of tool storage holes are arranged side by side and at intervals.

Further, the elastic engaging portion includes a pair of elastic engaging arms, each of the elastic engaging arms extends from the second side of the fixing plate in a direction perpendicular to the fixing plate, and one of the two elastic engaging arms When the two elastic engagement arms slide into the positioning hole, there is a predetermined clearance for relative movement under the pressing force of the wall of the positioning hole.

Further, a sleeve is sheathed on the end of each cross bar, and the sleeve includes an annular main body and a tail part connected to the main body and used to abut against the pillar, and the main body is connected to the main body away from the tail part. The cross-sectional area of one end decreases to the cross-sectional area of the other end near the tail.

Further, a plurality of convex ribs protrude from the inner wall of the main body, and the ribs are arranged at intervals along the circumferential direction of the main body.

Compared with the prior art, the portable insulating ladder used for power operation and maintenance provided by the present invention has the following beneficial effects:

1. The components of the present invention are made of fiberglass reinforced composite materials, which have the advantages of good insulation effect, light weight, high strength, and the ladder body is extremely stable during use, and there will be no falling accidents caused by the ladder body being unstable , the withstand voltage value can reach about 15000kV, even if the operator accidentally touches the live body during the operation, it can form a safety protection, which greatly improves the safety factor of the operation, and can eliminate the operator's fear of electric shock;

2. The overall weight is only 4.15 kg at most, and the portable insulating ladder can be tied to the carrier through the design of the binding belt, which is convenient for handling and carrying;

3. It has multiple functions. It comes with a tool holder. The tool storage hole of the tool holder can be used by construction workers to store some commonly used tools temporarily, which is convenient for operators to a certain extent and effectively prevents falling from high altitude when taking and placing tools from the tool pocket. material risk;

4. Equipped with an elastic fiber control belt, it can control the opening angle of the portable insulation ladder, so it can be used in a small job site, with a wide range of applications and good economic benefits.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram 1 when the portable insulating ladder provided by the embodiment of the present invention is deployed;

Fig. 2 is a three-dimensional schematic diagram II when the portable insulating ladder provided by the embodiment of the present invention is deployed;

Fig. 3 is an enlarged view of part A in Fig. 2;

Fig. 4 is a three-dimensional schematic view of the portable insulating ladder provided by the embodiment of the present invention when it is closed;

Fig. 5 is an enlarged view of part B in Fig. 4;

Fig. 6 is a schematic perspective view of a sleeve provided by an embodiment of the present invention;

Fig. 7 is a schematic cross-sectional view of the sleeve provided by the embodiment of the present invention.

Description of main component symbols

100: Portable insulation ladder

10: Working platform

11: Pedal 111: Stepping part

112: Outer frame part 113: Through hole

12: Hinge

13: Engagement structure 131: Positioning protrusion

131a: flange 132: positioning groove

20: Tool placement bracket

21: Fixed plate 22a: First side

22b: Second side

22: Placement board 221: Tool storage hole

23: Connection structure 231: Elastic joint

231a: Elastic engagement arm 232: Positioning hole

30: Ladder

31: Ladder section 311: Pillar

312: cross bar 313: connector

3131: Sleeve 3132: Flange

316: Anti-slip sleeve 317: Sleeve

3171: Main Body 3172: Tail

3173: convex rib

40: Binding belt 41: The first section

42: Second paragraph 43: Transitional paragraph

44: First fastener 45: Second fastener

50: Elastic fiber control belt 51: Fiber belt body

511: first end 512: second end

52: belt buckle

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the implementation of the present invention will be described in detail below in conjunction with specific drawings.

For the convenience of description, the "front", "rear", "left", "right", "upper" and "lower" referred to in the following are consistent with the front, back, left, right, up and down directions of the drawings themselves, but they do not refer to this The structure of the invention is limiting.

Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Likewise, words like "a" or "one" do not denote a limitation in quantity, but indicate that there is at least one.

As shown in Figures 1 to 7, it is a preferred embodiment of the present invention.

The present embodiment provides a portable insulating ladder 100 for power operation and maintenance, which includes a working platform 10, a tool placement bracket 20, a ladder body 30, and a binding strap 40 for binding on a carrier; the working platform 10 includes two A pedal 11, a hinge 12 pivotally connecting the two pedals 11 is provided between them; each pedal 11 includes a rectangular stepping portion 111 and an outer frame portion 112 connected to the outer periphery of the stepping portion 111, the stepping portion 111 There are a plurality of through holes 113; an engaging structure 13 is provided between the two pedals 11, and the engaging structure 13 includes a protruding part on the side surface of the outer frame portion 112 of one of the two pedals 11 close to the other pedal 11. At least one positioning protrusion 131 and a positioning groove 132 provided on another pedal 11 for at least one positioning protrusion 131 to embed; the tool placement bracket 20 includes a flat plate-shaped fixing plate 21 and a placing plate 22 connected with the fixing plate 21, the fixing plate 21 has an opposite first side 22a and a second side 22b, the placement plate 22 is connected to the first side 22a of the fixed plate 21 and is perpendicular to the fixed plate 21, and the placement plate 22 is provided with a plurality of tool storage holes for placing tools 221; a connection structure 23 is provided between the pedal 11 and the tool placement bracket 20 to detachably connect the two. The connection structure 23 includes an elastic joint 231 protruding from the second side 22b of the fixing plate 21 and formed on the outer frame The positioning hole 232 on the side wall of the part 112 and for the elastic joint part 231 to slide in and out, the inner diameter of the positioning hole 232 is smaller than the section size of the elastic joint part 231; the ladder body 30 includes two ladder parts 31, and the two ladder parts 31 One-to-one correspondence with the two pedals 11 respectively; each ladder part 31 includes two parallel and respectively tubular pillars 311 and a plurality of tubular crossbars 312 connected between the two pillars 311, the pillars 311 are connected by Part 313 is fixedly connected to pedal 11; Binding strap 40 includes a first section 41 with a free end, a second section 42 with a free end and a transition section 43 connected between the first section 41 and the second section 42, the transition section 43 are respectively wound on the crossbars 312 of the two ladder parts 31, the free end of the first section 41 is provided with a first fastener 44, and the free end of the second end is provided with a first fastener 44 locked. Two fasteners 45; the above-mentioned portable insulating ladder 100 for electric power operation and maintenance also includes an elastic fiber control belt 50 for controlling the pivoting angle of the two pedals 11, and the elastic fiber control belt 50 includes the elastic fiber control belt 50 wrapped around the two ladder parts 31 The fiber belt main body 51 between the crossbars 312, the fiber belt main body 51 has an opposite first end 511 and a second end 512, the first end 511 is connected with a belt buckle for fastening with the second end 512 52.

The above-mentioned portable insulating ladder 100 for power operation and maintenance includes a working platform 10, a tool placement bracket 20, a ladder body 30, an elastic fiber control belt 50 and a binding belt 40 for binding on a carrier, which not only has a good insulation effect , light weight, high strength, and the advantages of abnormally stable ladder body during use greatly improve the safety factor of the operation. In addition, the portable insulating ladder 100 is easy to carry and use, has a wide range of applications, and has good economic benefits.

Referring to FIG. 1 , the portable insulating ladder 100 provided in this embodiment is a ladder ladder structure, including a working platform 10 , a tool placement bracket 20 , a ladder body 30 , elastic fiber control belts 50 and binding belts 40 .

As shown in Figures 1, 2 and 4, the working platform 10 is made of insulating fiber-reinforced composite material and PVC plastics, and the fiber-reinforced composite material is called GFRP (commonly called glass fiber reinforced plastic) when the fiber adopts glass fibers. The structure of the working platform 10 The strength can reach about 300MPa, which is close to the strength of steel structure. In this embodiment, the working platform 10 is connected to the upper end of the ladder body 30 and is supported by the ladder body 30. The working platform 10 includes two pedals 11 arranged front and back, and the two pedals 11 are arranged to be pivotally connected to each other. Together with the hinge 12, the hinge 12 includes a rotating shaft, and the two pedals 11 can rotate relatively around the axis of the rotating shaft, so as to realize the tiling and folding of the working platform 10. Each pedal 11 includes a rectangular stepping portion 111 and an outer frame portion 112 connected to the outer periphery of the stepping portion 111 , and the stepping portion 111 adopts a grid-like hollow structure.

Specifically, the top surface of the pedal 11 has a transverse direction and a longitudinal direction perpendicular to the transverse direction. The stepping portion 111 is provided with a plurality of through holes 113, and the plurality of through holes 113 cover the entire stepping portion 111. The plurality of through holes 113 are in the The stepping portions 111 are arranged in a horizontal direction and a vertical direction perpendicular to the horizontal direction, and the cross-sectional shape of the through hole 113 is but not limited to a rhombus. It can be understood that, by adopting the design of the through hole 113 , the weight of the working platform 10 is reduced while ensuring the structural strength, so as to facilitate the carrying and handling of the portable insulating ladder 100 .

4 and 5, an engaging structure 13 is provided between the two pedals 11. In this embodiment, the engaging structure 13 includes a positioning protrusion 131 and a positioning groove 132, and the positioning protrusion 131 protrudes from one of the pedals 11 (Fig. On the side surface of the outer frame portion 112 of the outer frame portion 112 close to the other pedal 11 (the right pedal in the illustration) (that is, the right side surface of the left pedal in the illustration), the positioning groove 132 is formed on On the other pedal 11 (the right pedal in the figure), the shape of the positioning groove 132 matches the shape of the positioning protrusion 131. When the working platform 10 is tiled, the positioning protrusion 131 is integrated into the positioning groove 132, and Tight fit connection. It is worth mentioning that a flange 131a is formed on the outer end of the positioning protrusion 131, and the flange 131a has a certain taper. When the two pedals 11 are connected, the above-mentioned engaging structure 13 can ensure the stability of the working platform 10. In addition, when the portable insulating ladder 100 is transported for a short distance, the relative rotation of the pedal 11 can be avoided. Therefore, during use, the short-distance transport does not need to re-level the working platform 10, which greatly improves the convenience of use.

Referring to Figures 1 to 5, the tool placement bracket 20 is made of plastic, and it includes a flat plate-shaped fixing plate 21 and a placement plate 22 connected with the fixing plate 21. In this embodiment, the tool placement bracket 20 is but not limited to two One, the fixed plate 21 has opposite first side 22a and the second side 22b, and the placement plate 22 is connected to the upper end of the first side 22a of the fixed plate 21 and is perpendicular to the fixed plate 21, and the placement plate 22 is provided with tools that can be used for placing tool storage hole 221. The cross-sectional shape of each tool storage hole 221 is circular, and runs through the top surface and the bottom surface of the placement plate 22 , and a plurality of tool storage holes 221 are arranged side by side and at intervals. It is easy to understand that the tool storage hole 221 of the tool placement bracket 20 can temporarily store some commonly used tools such as wire cutters and screwdrivers for construction personnel, which facilitates the operator to a certain extent and effectively prevents them from being picked up and placed from the tool pocket. There is a risk of falling objects from heights.

Referring to FIGS. 1 to 5 , a connection structure 23 is provided between the pedal 11 and the tool placement bracket 20 , and the tool placement bracket 20 is detachably connected to the pedal 11 through the connection structure 23 . The connecting structure 23 includes an elastic engaging portion 231 protruding from the second side 22b of the fixing plate 21 and a positioning hole 232 formed on the side wall of the outer frame portion 112 for the elastic engaging portion 231 to slide in and out. The positioning hole 232 The inner diameter is smaller than the section size of the elastic joint part 231 . Specifically, the shape of the positioning hole 232 matches the elastic joint part 231, the number of the elastic joint part 231 on the second side 22b on the fixing plate 21 is but not limited to, the positioning hole 232 is arranged on the left side of the outer frame part 112 or/ and on the right side surface, each elastic engaging portion 231 includes a pair of elastic engaging arms 231a, and each elastic engaging arm 231a extends from the second side 22b of the fixing plate 21 in a direction perpendicular to the fixing plate 21, and the elastic engaging arms 231a The cross-section is arcuate, the positioning hole 232 is roughly a waist-shaped hole, and a predetermined gap is reserved between the two elastic engaging arms 231a. When the two elastic engaging arms 231a slide into the positioning hole 232, the outer wall of the elastic engaging arm 231a is affected by The pressing of the wall of the positioning hole 232 makes the two elastic engaging arms 231a move relative to each other, and gradually narrows the predetermined gap.

Referring to FIGS. 1 to 5 , the ladder body 30 is made of FRP, and includes two ladder parts 31 arranged front and back, and the two ladder parts 31 correspond to the two pedals 11 respectively. Each ladder part 31 includes two parallel tubular pillars 311 and a plurality of tubular crossbars 312 connected between the two pillars 311 . In this embodiment, the outer diameter of the cross bar 312 is smaller than the inner diameter of the strut 311, and the inside of the strut 311 is formed with a mounting hole (not shown) for inserting the end of the cross bar 312, and the two ends of the cross bar 312 are A screw hole (not shown in the figure) is provided, and a via hole (not shown in the figure) corresponding to the screw hole is formed on the pillar 311. After the end of the cross bar 312 is inserted into the corresponding mounting hole, it is inserted through a fastener such as a screw. Through the via holes and the screw holes, the cross bar 312 and the pillar 311 are fixed. The lower end of the pillar 311 is covered with an anti-slip sleeve 316 , and the bottom of the anti-slip sleeve 316 is formed with anti-slip lines. It should be noted that the pillars 311 and the crossbars 312 in the ladder body 30 are both hollow structures, so that the overall weight of the portable insulating ladder 100 is relatively light.

Referring to Figures 1 to 5, specifically, the connector 313 includes an annular sleeve 3131 for placing the upper end of the pillar 311 and a flange 3132 formed at one end of the sleeve 3131, and the flange 3132 is secured by fasteners such as screws. It is fixedly connected with the pedal 11. A fixing hole (not shown) is provided on the side wall of the sleeve body 3131, and a screw hole (not shown) corresponding to the fixing hole is provided on the outer wall of the upper end of the pillar 311. Fastening by screws etc. The fastener passes through the fixing hole and the screw hole to connect and fix the upper end of the pillar 311 with the casing 3131 of the connector 313 , thereby fixing the pillar 311 and the pedal 11 .

Referring to Figures 6 and 7, sleeves 317 are sheathed on the ends of each crossbar 312. The sleeves 317 include an annular main body 3171 and a tail 3172 connected to the main body 3171 and used to abut against the pillar 311. The main body 3171 is away from the tail. The cross-sectional area of one end of the 3172 is reduced to the cross-sectional area of the other end near the tail portion 3172, and the tail portion 3172 has an arc that matches the surface of the pillar 311. In this way, the sleeve 317 is tightly connected with the cross bar 312, and the sleeve The barrel 317 will not slide arbitrarily on the cross bar 312 , and the tail part 3172 abuts against the pillar 311 to increase the contact area with the pillar 311 , thereby improving the connection strength between the cross bar 312 and the pillar 311 .

6 and 7, on the inner wall of the main body 3171, a plurality of ribs 3173 are protruded, and the ribs 3173 are arranged at intervals along the circumference of the main body 3171. The ribs 3173 are used as reinforcing ribs, which can improve the strength of the main body 3171 of the sleeve 317. In addition, the contact area with the cross bar 312 is reduced to facilitate the assembly of the sleeve 317 on the cross bar 312 .

1 to 7, the binding strap 40 includes a first section 41 with a free end, a second section 42 with a free end, and a transition section 43 connected between the first section 41 and the second section 42, the transition sections 43 are respectively Winding around the crossbars 312 of the two ladder parts 31 , the length of the transition section 43 is at least such that the transition section 43 will not be tensioned when the two ladder parts 31 swing relative to each other to the maximum angle (ie when the working platform 10 is flat). The free end of the first section 41 is provided with a first fastener 44, the first fastener 44 can be a suspension ring (certainly also can be a rope sleeve or a carabiner, etc.), and the free end of the second end is provided with a fastener that is compatible with the first fastener. 44 locked second fastener 45, the second fastener 45 can be a carabiner (certainly can also be a strap, etc.), it can be understood that when using vehicles such as motorcycles and bicycles to carry the portable insulating ladder 100 , the transition section 43 can be built on the support frame (not shown) at the rear of the vehicle, and then the first section 41 and the second section 42 are respectively wound on the support frame, and the first fastener 44 and the hanger The hooks are fastened to lock the two together, so that the portable insulating ladder 100 can be firmly placed on the carrier, so that the carrier can be used to carry to the next place where it needs to be used.

1 to 7, the portable insulating ladder 100 also includes an elastic fiber control belt 50 for controlling the pivoting angle of the two pedals 11, the elastic fiber control belt 50 includes a fiber belt main body 51, and the fiber belt main body 51 is wrapped around the two ladders. Between the cross bars 312 of the part 31, the fiber belt main body 51 has an opposite first end 511 and a second end 512, the first end 511 is connected with a belt buckle 52 for fastening with the second end 512, The second end portion 512 may be provided with a hole for engaging with the belt buckle 52 . The second end 512 can partly pass through the belt buckle 52, and adjust the tightness of the fiber belt main body 51 by passing through the length of the belt buckle 52, that is to say, adjust the wrapping around the two ladder parts through the belt buckle 52 The length of the fiber belt main body 51 between the crossbars 312 of 31 can keep the ladder at a small opening angle when used in a narrow space, so that the maintenance personnel can use it. In this way, the application range of the portable insulating ladder 100 can be increased. In addition, by setting the elastic fiber control belt 50, the use safety can be further ensured.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement or improvement made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (6)

1. A portable insulating ladder for power operation and maintenance, characterized in that it includes a working platform, a tool placement bracket, a ladder body and a binding strap for being bound on a carrier; the working platform includes two pedals, two A hinge that pivotally connects the two pedals is provided between the two pedals; each pedal includes a rectangular stepping part and an outer frame part connected to the outer periphery of the stepping part, and the stepping part has a plurality of through holes; An engaging structure is provided between the two pedals, and the engaging structure includes at least one positioning protrusion protruding on the side surface of the outer frame of one of the two pedals close to the other pedal and opening on the other side. A positioning groove on the pedal and for at least one positioning protrusion to be embedded; the tool placement bracket includes a flat plate-shaped fixing plate and a placing plate connected with the fixing plate, and the fixing plate has opposite first sides and second side, the placing plate is connected to the first side of the fixing plate and is perpendicular to the fixing plate, and a plurality of tool storage holes for placing tools are opened on the placing plate; the pedal and the tool are placed A connection structure is provided between the brackets to detachably connect the two, and the connection structure includes an elastic joint part protruding from the second side of the fixing plate and formed on the side wall of the outer frame part for supplying The elastic joint slides into and out of the positioning hole, and the inner diameter of the positioning hole is smaller than the section size of the elastic joint; the ladder body includes two ladder parts, and the two ladder parts are respectively connected to the two pedals. One-to-one correspondence; each ladder portion includes two tubular pillars parallel to each other and a plurality of tubular cross bars connected between the two pillars, the pillars are fixedly connected to the Pedal; the binding belt includes a first section with a free end, a second section with a free end, and a transition section connected between the first section and the second section, and the transition sections are respectively wound around On the cross bars of the two ladder parts, a first fastener is provided on the free end of the first section, and a second fastener locked with the first fastener is provided on the free end of the second end. parts; the portable insulating ladder for electric power operation and maintenance also includes an elastic fiber control belt for controlling the pivoting angle of the two pedals, and the elastic fiber control belt includes a cross bar wrapped around the two ladder parts The main body of the fiber belt, the main body of the fiber belt has an opposite first end and a second end, the first end is connected with a belt buckle for fastening with the second end. 2. The portable insulating ladder for electric power operation and maintenance according to claim 1, characterized in that, a plurality of through holes are arranged in the transverse direction of the stepping part and in the longitudinal direction orthogonal to the transverse direction, so The cross-sectional shape of the through hole is rhombus. 3. The portable insulating ladder for power operation and maintenance according to claim 1, wherein the cross-sectional shape of each of the tool storage holes is circular, and runs through the top and bottom surfaces of the placement plate, Multiple tool storage holes are arranged side by side and at intervals. 4. The portable insulating ladder for electric power operation and maintenance according to claim 1, wherein the elastic joint part comprises a pair of elastic joint arms, and each of the elastic joint arms extends from the second side of the fixed plate. The side extends in a direction perpendicular to the fixing plate, and there is a predetermined space between the two elastic engagement arms for relative movement when the two elastic engagement arms slide into the positioning hole due to the pressing force of the positioning hole wall. gap. 5. The portable insulating ladder used for electric power operation and maintenance according to claim 1, wherein a sleeve is sleeved on the end of each of the cross bars, and the sleeve includes an annular main body and is connected with the main body. Connected to and used to abut against the tail of the pillar, the body decreases from a cross-sectional area of one end away from the tail to a cross-sectional area of the other end close to the tail. 6. The portable insulating ladder for power operation and maintenance according to claim 5, characterized in that, the inner wall of the main body is protruded with a plurality of ribs, and the ribs are arranged at intervals along the circumference of the main body .