CN111894444B

CN111894444B - Maintenance ladder with toolbox

Info

Publication number: CN111894444B
Application number: CN202010652651.4A
Authority: CN
Inventors: 张涛; 于峰; 糜德凯; 刘海东; 陈向前
Original assignee: Binhai Qiangyuan Electrical Industry Co ltd; Binhai County Power Supply Branch Of State Grid Jiangsu Electric Power Co ltd; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Current assignee: Binhai Qiangyuan Electrical Industry Co ltd; Binhai County Power Supply Branch Of State Grid Jiangsu Electric Power Co ltd; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd; Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2022-04-15
Anticipated expiration: 2040-07-08
Also published as: CN111894444A

Abstract

The invention provides a maintenance ladder with a tool box, which comprises a ladder body, wherein the ladder body is provided with the tool box for bearing and placing maintenance tools; the ladder body comprises ladder struts and step bars among the cross frame ladder struts; a limit groove arranged along the extension direction of the ladder support is arranged between the ladder supports, and the pedal rod is arranged in the limit groove so as to slide along the limit direction of the limit groove; the tool box is arranged on the ladder support; the tool box acts on the pedal rod through external force, so that the pedal rod slides to drive the pedal rod to move along the direction opposite to the sliding direction of the pedal rod, the hands of operators are prevented from leaving the maintenance ladder, and the safety in the climbing process is ensured.

Description

Maintenance ladder with toolbox

Technical Field

The invention belongs to the field of maintenance tools, and particularly relates to a maintenance ladder with a tool box.

Background

In the field of power maintenance, it is known to use maintenance ladders to be set up on poles for the operator to climb; in order to accommodate the maintenance tools required for the maintenance process, a tool box is often used to accommodate the tools and is pulled to move the tool box to a position where the operator climbs. During the maintenance operation, the inventor finds that the maintenance ladder in the prior art has at least the following problems:

firstly, after an operator is in place, the tool box is pulled to the position where the operator is located, at least one hand of the tool box needs to be separated from the maintenance ladder in the pulling process, the gravity center of the body of the operator is often difficult to maintain in the force application process, particularly, when a heavy tool is pulled, the tool box has the risk of falling off the maintenance ladder, and meanwhile, when the tool box is climbed to a higher telegraph pole position, the tool box is far away from the operator, so that the tool box needs to be continuously pulled to the higher position, and the tool box is very inconvenient to use by a single person.

In view of the above, it is necessary to develop a maintenance ladder to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention mainly aims to provide the maintenance ladder, the pedal rod is pulled by manpower to slide downwards, so that the tool box is driven to move upwards, an operator is prevented from hurting hands to pull the tool box, and the safety in the climbing process is improved.

Another object of the present invention is to provide a maintenance ladder, which includes a unidirectional moving mechanism between two ladder sections, so that the two ladder sections can be extended and retracted while forming a fixed structure, thereby ensuring the stability during climbing.

To achieve the above objects and other advantages in accordance with the present invention, there is provided a service ladder with a tool box, including:

the first-level ladder is provided with a tool box for bearing and placing maintenance tools;

the first-level ladder comprises a first support column, a cross beam and a second support column, the first support column, the cross beam and the second support column are sequentially connected to form a U-shaped ladder body, and a plurality of pedal rods are erected between the first support column and the second support column;

limiting grooves extending in the vertical direction are formed in the first supporting column and the second supporting column, two ends of the pedal rod are arranged in the limiting grooves, and the tool box is in transmission connection with the pedal rod;

the pedal rod is acted by external force, so that the pedal rod slides along the limiting direction of the limiting groove, and the tool box is driven to move along the direction opposite to the sliding direction of the pedal rod.

Preferably, the same side wall of the first-level ladder, on which the toolbox is mounted, is further provided with a pulley block, the pedal rods are connected through a rope, and the rope bypasses the pulley block and is connected with the toolbox, so that a pulling mechanism for pulling the toolbox to lift is formed.

Preferably, the limiting groove comprises a first limiting groove, and the first limiting groove comprises a transfer part and a limiting part;

wherein, the transit part is communicated with the limiting part, the pedal lever can rotate in the transit part, and the limiting part limits the rotation of the pedal lever; the transfer part and the limiting part are arranged in sequence along the vertical downward direction.

Preferably, the limiting groove further comprises a second limiting groove, and the second limiting groove is formed in the bottom of the first limiting groove;

two ends of the pedal rod extend into the second limiting groove, so that the pedal rod is limited by the first limiting groove and the second limiting groove in the sliding direction;

the two ends of the pedal rod are respectively provided with a first connecting part and a second connecting part, the second connecting part is inserted in the second limiting groove close to one side of the pulley block, and an opening for the rope to pass through is formed in the inner wall of the second limiting groove in which the second connecting part is inserted, so that the rope is connected in series to the second connecting part.

Preferably, the second connecting portion is provided with a clamping portion for clamping the cord, so that the cord is wound around the second connecting portion when the foot lever is turned.

Preferably, an open containing cavity is formed in the tool box, and maintenance tools are placed in the containing cavity;

the top of utensil case is installed the connector link, the rope line cover is established on the connector link, thereby makes the toolbox is connected on the rope line.

Preferably, the first-level ladder is further provided with a guide member for guiding the toolbox, and the toolbox is limited in the sliding direction by the guide member, so that the toolbox is driven by the pedal lever to slide along the direction limited by the guide member.

Preferably, a secondary ladder is also included; the secondary ladder is used for supporting the maintenance ladder, and the primary ladder can slide relative to the secondary ladder;

the tool box is arranged on the first-level ladder, an unidirectional moving mechanism is arranged between the first-level ladder and the second-level ladder, and the first-level ladder passes through the unidirectional moving mechanism so as to slide upwards in one direction relative to the second-level ladder.

Preferably, the one-way moving mechanism comprises a ratchet bar and pawl assembly;

the ratchet bar is embedded in a notch on the secondary ladder, the pawl assembly is mounted on the primary ladder, and the secondary ladder and the primary ladder limit reverse movement of the pawl assembly through the ratchet bar, so that unidirectional sliding is realized.

Preferably, the pawl assembly comprises a driving pawl and a driven pawl, and the driving pawl and the driven pawl are arranged on the ladder support of the primary ladder;

the driving pawl and the driven pawl are connected into a whole through the synchronizing shaft, a handle is arranged on the driving pawl, and external force acts on the handle to enable the pawl on the pawl assembly to be disconnected with the ratchet bar.

Compared with the prior art, the invention has the beneficial effects that:

according to the maintenance ladder with the toolbox, the pedal rod is pulled to slide downwards so as to drive the toolbox to move upwards, so that an operator is prevented from hurting hands to pull the toolbox, the safety in a climbing process is improved, the pedal rod is climbed to lift the toolbox, and the maintenance ladder is convenient to operate by a single person.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic expanded perspective view of an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

FIG. 3 is a schematic drawing showing a closed three-dimensional structure according to an embodiment of the present invention;

FIG. 4 is a first perspective view of a first ladder according to an embodiment of the present invention;

FIG. 5 is a second perspective view of a ladder according to an embodiment of the present invention;

FIG. 6 is a partial schematic view of a primary ladder according to an embodiment of the present invention;

FIG. 7 is an enlarged partial schematic view of FIG. 6;

FIG. 8 is a perspective view of a foot bar according to an embodiment of the present invention;

FIG. 9 is a perspective view of a tool box according to an embodiment of the present invention;

FIG. 10 is a simplified schematic of the operation of the present invention in one embodiment.

Shown in the figure:

11. a second-level ladder;

111. a support leg;

112. a pedal;

113. a guide chute;

114. a ratchet bar;

12. a first-level ladder;

121. a first limit groove; 1211. a transfer section; 1212. a limiting part;

122. a second limit groove;

123. a foot bar;

1231. a first connection portion; 1232. a second connecting portion; 1233. a clamping portion;

124. a pawl assembly; 1241. an active pawl; 1242. a driven pawl; 1243. a synchronizing shaft; 1244. a reset member;

125. a pulley block;

126. a guide member;

13. a tool box;

131. a cavity;

132. a connecting buckle.

Detailed Description

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a full and partial embodiment of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," "primary," "secondary," and the like in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

One embodiment of the present invention is shown in fig. 4 and 5, and a maintenance ladder with a tool box comprises a ladder body, wherein the ladder body is provided with a tool box 13 for holding maintenance tools;

specifically, the ladder body comprises ladder struts and pedal rods 123, the ladder struts serve as a supporting structure of the maintenance ladder, and meanwhile, the pedal rods 123 are transversely arranged among the ladder struts, so that temporary supporting points convenient for operators to hold or tread are formed; when an operator holds the pedal rod 123, the pedal rod 123 is subjected to the action of the gravity of the operator due to the upward climbing trend of the pedal rod 123, and the pedal rod 123 slides to a position below the limit groove;

the tool box 13 is arranged on the ladder support; the tool box 13 acts on the pedal rod 123 through external force, so that the pedal rod 123 slides, the pedal rod is driven to move along the direction opposite to the sliding direction of the pedal rod 123, namely when the pedal rod 123 slides downwards under the action of the gravity of a human body, the tool box 13 correspondingly moves upwards, the condition that an operator pulls up the tool box 13 is avoided, in the climbing process of the tool box, the tool box 13 simultaneously rises, the condition that the hand of the operator is separated from the ladder body to cause the risk of falling is avoided, the safety in the climbing process is improved, the tool box can be lifted through climbing, and single operation is facilitated.

In this embodiment, referring to fig. 10, it can be noted that the ladder body is further provided with a pulley block 125, the pedal rods 123 are connected with each other through a rope, and the rope is connected with the toolbox 13 by bypassing the pulley block 125, so as to form a lifting mechanism for pulling the toolbox 13 to be lifted, so that an operator can press the pedal rods 123 downwards to lift the toolbox 13.

More specifically, referring to fig. 6 and 7, the limiting groove includes a first limiting groove 121, the first limiting groove 121 limits the sliding direction of the pedal rod 123 while the first limiting groove 121 limits the rotation of the pedal rod 123, the first limiting groove 121 includes a transit portion 1211 and a limiting portion 1212;

wherein, the transit part 1211 is communicated with the limiting part 1212, the pedal rod 123 can rotate in the transit part 1211, the limiting part 1212 limits the rotation of the pedal rod 123; the transit portion 1211 and the restriction portion 1212 are sequentially disposed along the ladder support extending downward direction, the pedal 123 can rotate when the pedal 123 is located in the transit portion 1211, the restriction portion 1212 restricts the rotation of the pedal 123 after the pedal 123 is located in the restriction portion 1212, and the width of the transit portion 1211 is larger than that of the restriction portion 1212.

Further, the limiting groove further includes a second limiting groove 122, and the second limiting groove 122 is formed at the bottom of the first limiting groove 121; both ends of the pedal rod 123 extend into the second limiting groove 122, so that the sliding direction of the pedal rod 123 is limited by the first limiting groove 121 and the second limiting groove 122;

referring to fig. 8, in order to match the limiting groove, the structure of the pedal rod 123 is shown in more detail, the two ends of the pedal rod 123 are respectively a first connecting portion 1231 and a second connecting portion 1232, the second connecting portion 1232 is inserted into the second limiting groove 122 on the side close to the pulley block 125, and an opening for passing a rope is opened on the inner wall of the second limiting groove 122 where the second connecting portion 1232 is inserted, so that the rope is connected to the second connecting portion 1232 in series; the cross-sectional shape of the foot bar 123 is a rectangle, the length of which is greater than the width of the second limiting groove 122, and the width of which is equal to the width of the second limiting groove 122.

Meanwhile, the clamping portion 1233 for clamping the rope is disposed on the second connecting portion 1232, so that when the foot bar 123 is turned over, the rope is wound around the second connecting portion 1232, and it should be noted that the clamping portion 1233 is not commonly clamped to limit the rope from sliding, and the rope can slide relative to the foot bar 123 after the rope is pulled by a certain amount.

According to the above description of the structural features of the service ladder, the working process of the service ladder comprises,

when an operator climbs the maintenance ladder, the wide side of the foot lever 123 corresponds to the limiting portion 1212 by turning over the foot lever 123, meanwhile, the rope is wound on the second connecting portion 1232 in a turning manner, the foot lever 123 slides into the limiting portion 1212, and the rope is continuously pulled in the process of turning over the foot lever 123 and sliding into the limiting portion 1212, so that the tool box 13 ascends; meanwhile, the pedal lever 123 above the pedal lever 123 held by the operator is restricted at a position where the transit portion 1211 is close to the entrance of the restriction portion 1212;

subsequently, the operator holds the upper pedal lever 123 with his hand, turns it over again and slides it into the corresponding defining portion 1212, and pulls the string again, so that the toolbox 13 is raised again;

through foretell mode, toolbox 13 is constantly upwards pulled up along with operating personnel's climbing to conveniently realize that operating personnel climbs where then toolbox 13 lifts to where, thereby reduce the step that operating personnel pulled toolbox 13.

After the operator climbs down from the maintenance ladder after completing the maintenance work, the operator can pull the tool box 13 to completely reset the pedal rod 123 by pulling the limiting portion 1212 due to the gravity of the tool box 13, so that the reset is realized.

Reference will now be made to fig. 9, which shows the tool box 13 in more detail, with an open cavity 131 provided therein, the cavity 131 being adapted to receive a service tool therein; the cavity 131 is provided with an opening for conveniently storing maintenance tools.

And a connecting buckle 132 is installed on the top of the tool box 13, and the cord is sleeved on the connecting buckle 132, so that the tool box 13 is connected to the cord.

A guide 126 is arranged between the tool box 13 and the ladder support, and the tool box 13 is limited in the sliding direction by the guide 126, so that the tool box 13 is driven by the pedal rod 123 to slide along the direction limited by the guide 126.

Referring to fig. 1-3, in a further embodiment of the present invention, the body of the ladder comprises a secondary ladder 11 and a primary ladder 12; the second-level ladder 11 is used for supporting a maintenance ladder, and the first-level ladder 12 can slide relative to the second-level ladder 11;

specifically, the support legs 111 are arranged at the bottom of the ladder supports of the secondary ladder 11, the surface of the support legs 111 contacting with the ground is inclined, so that the whole maintenance ladder is obliquely erected on a telegraph pole, and pedals 112 are fixedly arranged between the ladder supports of the secondary ladder 11;

the side that the ladder of second grade ladder 11 propped has seted up on the side and has led spout 113, is provided with the slider simultaneously on one-level ladder 12, through the slider on leading spout 113 to restriction one-level ladder 12 is followed and is led spout 113 and injectd the direction and slide for second grade ladder 11.

Further, the tool box 13 is mounted on the first-stage ladder 12, a unidirectional moving mechanism is arranged between the first-stage ladder 12 and the second-stage ladder 11, and the first-stage ladder 12 slides upwards in a unidirectional manner relative to the second-stage ladder 11 through the unidirectional moving mechanism.

In this embodiment, the unidirectional moving mechanism is a tooth-type ratchet structure, and includes a ratchet rack 114 and a pawl assembly 124;

the ratchet bar 114 is embedded in a notch on the secondary ladder 11, the pawl assembly 124 is mounted on the primary ladder 12, and the reverse movement of the pawl assembly 124 is limited by the ratchet bar 114 between the secondary ladder 11 and the primary ladder 12, so that the unidirectional sliding is realized.

As will now be shown in more detail with reference to fig. 6, the pawl assembly 124 includes a driving pawl 1241 and a driven pawl 1242, the driving pawl 1241 and the driven pawl 1242 being disposed on the ladder stays of the primary ladder 12;

the driving pawl 1241 and the driven pawl 1242 are connected into a whole through the synchronizing shaft 1243, a handle is arranged on the driving pawl 1241, and external force acts on the handle to disconnect the pawl on the pawl assembly 124 from the ratchet bar 114; meanwhile, an elastic reset piece 1244 is arranged between the driving pawl 1241 and the ladder support of the primary ladder 12; so that the driving pawl 1241 and the driven pawl 1242 can quickly restrict the reverse movement of the primary ladder 12 by the restoring force of the restoring member 1244.

According to the maintenance ladder, the specific working process comprises two conditions:

firstly, when the climbing height is not high and only the length of the secondary ladder 11 is needed, the primary ladder 12 is pushed out to drive the tool box 13 to slide to a needed position, and an operator climbs the secondary ladder 11 to a specified position, so that maintenance tools in the tool box 13 can be taken to work;

when the work is completed, the operator climbs down the maintenance ladder, and pushes the handle on the active pawl 1241 to disconnect the pawl on the pawl assembly 124 from the tooth portion on the ratchet bar 114, so that the secondary ladder slides downward to close the two steps of ladders.

Secondly, when the climbing height is higher, the same manner as the above is adopted, and the difference is that the primary ladder 12 is erected to the designated position, the operator climbs to the primary ladder 12 from the secondary ladder 11 and finally moves to the designated position, and the tool box 13 is pulled by the pedal rod 123 and moves to the designated position along with the operator; the other steps are similar to those described above.

The mode of "the pedal rod slides to drive the toolbox to move" is only one implementation mode, and a common mechanism that the box body is driven to lift by manpower is considered as an embodiment of the present invention, for example, a limiting groove with different lengths can also be used for continuously pulling up the toolbox 13, and is also considered as a specific embodiment of the present invention.

Meanwhile, the solution of the unidirectional movement mechanism described above, which is realized by the ratchet and the pawl, is only a specific embodiment of the unidirectional movement mechanism in the present invention, and the application, modification and variation of the common unidirectional movement mechanism in the present invention will be obvious to those skilled in the art, and should be considered as falling within the protection scope of the present invention.

According to the maintenance ladder with the toolbox, the pedal rod is pulled to slide downwards, so that the toolbox is driven to move upwards, an operator is prevented from taking out hands to pull the toolbox, and the safety in the climbing process is improved; the unidirectional moving mechanism is arranged between the two sections of ladders, so that the two sections of ladders can stretch and retract and form a fixed structure at the same time, and the stability during climbing is ensured.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a maintenance ladder with toolbox which characterized in that includes:

the primary ladder (12) is provided with a tool box (13) for bearing and placing maintenance tools;

the first-level ladder (12) comprises a first supporting column, a cross beam and a second supporting column, the first supporting column, the cross beam and the second supporting column are sequentially connected to form a U-shaped ladder body, and a plurality of pedal rods (123) are erected between the first supporting column and the second supporting column;

limiting grooves extending in the vertical direction are formed in the first supporting column and the second supporting column, two ends of the pedal rod (123) are arranged in the limiting grooves, and the tool box (13) is in transmission connection with the pedal rod (123);

the pedal rod (123) is acted by external force, so that the pedal rod (123) slides along the limiting direction of the limiting groove, and the tool box (13) is driven to move along the direction opposite to the sliding direction of the pedal rod (123);

a pulley block (125) is further mounted on the same side wall of the first-level ladder (12) on which the toolbox (13) is mounted, the pedal rods (123) are connected through a rope, and the rope bypasses the pulley block (125) to be connected with the toolbox (13), so that a pulling-up mechanism for pulling the toolbox (13) to be lifted is formed;

the limiting groove comprises a first limiting groove (121), and the first limiting groove (121) comprises a transit part (1211) and a limiting part (1212);

wherein the transit part (1211) is communicated with the limiting part (1212), the pedal rod (123) can rotate in the transit part (1211), and the limiting part (1212) limits the rotation of the pedal rod (123); the transit part (1211) and the limiting part (1212) are sequentially arranged along the vertical downward direction;

the limiting groove further comprises a second limiting groove (122), and the second limiting groove (122) is formed in the bottom of the first limiting groove (121);

two ends of the pedal rod (123) extend into the second limiting groove (122), so that the sliding direction of the pedal rod (123) is limited by the first limiting groove (121) and the second limiting groove (122);

the two ends of the pedal rod (123) are respectively provided with a first connecting part (1231) and a second connecting part (1232), the second connecting part (1232) is inserted into the second limiting groove (122) close to one side of the pulley block (125), and an opening for the rope to pass through is formed in the inner wall of the second limiting groove (122) in which the second connecting part (1232) is inserted, so that the rope is connected in series to the second connecting part (1232).

2. The service ladder with toolbox of claim 1, characterized in that the second connecting portion (1232) is provided with a clamping portion (1233) for clamping the cord so that the cord is wound around the second connecting portion (1232) when the foot bar (123) is turned.

3. The service ladder with the tool box as claimed in claim 1, wherein an open cavity (131) is arranged on the tool box (13), and the cavity (131) is used for holding service tools;

connecting buckles (132) are installed at the tops of the toolboxes (13), and the rope line sleeves are arranged on the connecting buckles (132), so that the toolboxes (13) are connected on the rope line.

4. The service ladder with toolbox according to any one of claims 1-3, characterized in that, the said primary ladder (12) is further installed with a guide (126) for guiding the said toolbox (13), the said toolbox (13) is limited in its sliding direction by the said guide (126), so that the said toolbox (13) is driven by the said pedal rod (123) to slide along the limited direction of the said guide (126).

5. A service ladder with toolbox according to any one of claims 1-3, further comprising a secondary ladder (11); the secondary ladder (11) is used for supporting the maintenance ladder, and the primary ladder (12) can slide relative to the secondary ladder (11);

the tool box (13) is installed on the first-level ladder (12), an unidirectional moving mechanism is arranged between the first-level ladder (12) and the second-level ladder (11), and the first-level ladder (12) slides upwards in a unidirectional mode relative to the second-level ladder (11) through the unidirectional moving mechanism.

6. The ladder as claimed in claim 5, wherein the unidirectional moving mechanism comprises a ratchet bar (114) and a pawl assembly (124);

the ratchet rack (114) is embedded in a notch on the secondary ladder (11), the pawl assembly (124) is installed on the primary ladder (12), and the secondary ladder (11) and the primary ladder (12) limit the reverse movement of the pawl assembly (124) through the ratchet rack (114), so that unidirectional sliding is realized.

7. The service ladder with toolbox of claim 6, wherein the pawl assembly (124) comprises a driving pawl (1241) and a driven pawl (1242), the driving pawl (1241) and the driven pawl (1242) are disposed on the ladder stay of the primary ladder (12);

the driving pawl (1241) and the driven pawl (1242) are connected into a whole through a synchronizing shaft (1243), a handle is arranged on the driving pawl (1241), and external force acts on the handle to enable the pawl on the pawl assembly (124) to be disconnected from the ratchet bar (114).