Safe extending device for wind tunnel crawling ladder

Abstract

The utility model provides a wind tunnel ladder stand safety extension device, and relates to the technical field of ladder stand extension, the device comprises a ladder stand, the ladder stand comprises two first side rods and a plurality of first cross rods arranged between the two first side rods, and the ladder stand is provided with an extension device; the extension device comprises an adding assembly and a lifting assembly, the adding assembly is installed on the outer side of the first side rod, and the lifting assembly is installed on the adding assembly; the lifting assembly is provided with a pull handle, the pull handle can enable the lifting assembly to rise, limiting assemblies are installed on the lifting assembly in a bilateral symmetry mode, and the limiting assemblies are located at the bottom end of the lifting assembly and used for limiting the position of the pull handle. According to the technical scheme of the utility model, the dangerous situation that a worker falls into a wind tunnel is greatly reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ladder extension, in particular to a wind tunnel ladder safety extension device. Background Art

[0002] The equipment of hydropower station units is relatively large, and its internal components usually need to be inspected or maintained within a certain period of time. Therefore, manhole passages are set up, such as wind tunnel entrances, which are usually equipped with fixed ladders. A cover plate is provided on the upper part of the ladder to cover the opening. The ladder is a straight ladder and is only opened during operation and maintenance to allow operation and maintenance personnel to enter and exit.

[0003] Since the upper end of the ladder is lower than or flush with the cave entrance, personnel need to sit on the ground with their feet to reach the ladder when entering, then slowly descend and change posture by holding the ground with their hands until they step on the ladder while holding the ladder with their hands. When personnel come out, they need to stretch their hands out of the wind tunnel, hold on to the ground, and slowly climb upwards with their feet until they sit on the ground after exiting the cave and then stand up. The ladder is not convenient for personnel to reach and is very dangerous, and people are prone to fall. Utility Model Content

[0004] The embodiment of the utility model provides a wind tunnel ladder safety extension device to solve the problem in the prior art that the upper end of the ladder is lower than or flush with the tunnel opening, and people cannot safely enter or leave the climbing posture.

[0005] Other features and advantages of the present invention will become apparent from the following detailed description or may be learned in part from the practice of the present invention.

[0006] According to a first aspect of an embodiment of the utility model, there is provided a wind tunnel ladder safety extension device, comprising: a ladder, the ladder comprising two first side bars and a plurality of first cross bars arranged between the two first side bars, the ladder being provided with an extension device;

[0007] The extension device comprises an additional component and a lifting component, wherein the additional component is installed on the outside of the first side bar, and the lifting component is installed on the additional component;

[0008] The lifting assembly is provided with a handle, which can lift the lifting assembly. A limiting assembly is symmetrically installed on the lifting assembly. The limiting assembly is located at the bottom end of the lifting assembly and is used to limit the position of the handle.

[0009] In some embodiments of the present utility model, based on the aforementioned solution, the added assembly includes a spliced ​​side frame and a mounting assembly;

[0010] The spliced ​​side frame is slidably connected to the first side bar;

[0011] The mounting assembly is arranged on the splicing side frame, is located on the inner side of the splicing side frame, and is detachably connected to the first cross bar, and is used for mounting the additional assembly on the ladder.

[0012] In some embodiments of the present invention, based on the above-mentioned solution, a groove is opened on the inner side of the splicing side frame, the first side bar is located on the inner side of the groove of the splicing side frame, and the outer side of the first side bar is slidably connected to the groove.

[0013] In some embodiments of the present invention, based on the above solution, the mounting assembly includes: at least three mounting blocks and a clamping rod;

[0014] The at least three mounting blocks are arranged on the inner side of the spliced ​​side frame, and when the mounting assembly is installed on the ladder, the at least three mounting blocks surround the first crossbar in the middle;

[0015] Each of the mounting blocks is provided with a through slot, the top end of the clamping rod is fixedly connected with a bolt, and the bottom end of the clamping rod passes through the slots of the at least three mounting blocks in sequence and is fixedly connected with the bolt.

[0016] In some embodiments of the present utility model, based on the above scheme, the lifting assembly includes: a sliding rod, a top block, two second side rods, a plurality of second cross rods and a limit block;

[0017] The sliding rod is slidably mounted on the splicing side frame;

[0018] The top block is fixedly mounted on the top end of the slide bar, and the bottom end of the top block is fixedly connected to the second side bar;

[0019] The plurality of second cross bars are fixedly arranged between the two second side bars;

[0020] The limit block is fixedly mounted on the front end surface of the splicing side frame, and the outer side of the second side bar is slidably connected to the limit block.

[0021] In some embodiments of the present utility model, based on the above-mentioned solution, a limiting groove is provided on the inner side of the splicing side frame, and the sliding rod is slidably installed in the limiting groove.

[0022] In some embodiments of the present utility model, based on the above scheme, the limit assembly includes: a fixed sleeve, a rotating sleeve, a torsion spring, a connecting block, a stopper and an insertion rod;

[0023] The fixing sleeve is fixedly connected to the outer side of the second side rod;

[0024] The rotating sleeve is rotatably connected to the fixed sleeve;

[0025] The torsion spring is arranged between the fixed sleeve and the rotating sleeve;

[0026] The connecting block is fixedly connected to the outer side of the rotating sleeve, and the outer side of the connecting block is slidably connected to the fixed sleeve;

[0027] The stopper is fixedly connected to a side of the connecting block away from the fixing sleeve;

[0028] The insertion rod is fixedly connected to the bottom end of the stopper, a slot is provided at the top end of the first side rod, the rotation track of the insertion rod is arc-shaped, and the rotation track of the insertion rod intersects with the extension line of the slot.

[0029] In some embodiments of the present invention, based on the above solution, the limiting assembly is arranged between two second cross bars located at the bottom end of the lifting assembly.

[0030] In some embodiments of the utility model, based on the above-mentioned scheme, a rotating groove is opened on the outer side of the fixed sleeve, the inner wall of the rotating groove is rotatably connected to the rotating sleeve through a rotating shaft, and the torsion spring is fixedly connected between the top of the rotating sleeve and the inner wall of the rotating groove.

[0031] In some embodiments of the present utility model, based on the aforementioned solution, the extension device further includes: a toggle assembly;

[0032] The toggle assembly comprises a sleeve, a connecting rod and a toggle rod;

[0033] The sleeve is fixedly connected to the rear end of the pull handle;

[0034] The connecting rod is slidably connected to the sleeve;

[0035] The shift rod is fixedly connected to the bottom end of the connecting rod, the shift rod is slidably connected to the outer side of the stopper, the movement track of the shift rod is linear, and the stopper is located on the movement track of the shift rod.

[0036] The technical solution of the utility model, through the provision of additional components and lifting components, can enable workers to enter the wind tunnel safely, greatly reduce the risk of workers falling into the wind tunnel, improve the safety of the use of the device, facilitate the installation of existing ladders, and complete the extension when the ladder itself exists, saving costs without the need to reinstall the entire thing.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 The overall structural diagram of a wind tunnel ladder safety extension device according to one embodiment of the utility model is shown;

[0040] Figure 2 A schematic diagram of the installation structure of an extension device of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0041] Figure 3 A schematic diagram of the installation structure of an additional assembly of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0042] Figure 4 A side view of the installation structure of bolts of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0043] Figure 5 A schematic diagram of the installation structure of a lifting assembly of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0044] Figure 6 A side view of the installation structure of a slide bar of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0045] Figure 7 A schematic diagram of the installation structure of a limit assembly of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0046] Figure 8 A structural side view of a stopper of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0047] Fig. 9 A schematic diagram of the installation structure of a toggle assembly of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown;

[0048] Fig.10 A top view of the installation structure of a lever of a wind tunnel ladder safety extension device according to an embodiment of the utility model is shown.

[0049] Description of Reference Numerals

[0050] 1-ladder; 2-extension device; 11-first side bar; 12-first cross bar; 21-additional assembly; 22-lifting assembly; 23-handle; 24-limiting assembly; 25-sliding assembly; 211-joined side frame; 212-mounting block; 213-clamping rod; 214-bolt; 221-sliding rod; 222-top block; 223-second side bar; 224-second cross bar; 225-limiting block; 241-fixing sleeve; 242-swivel sleeve; 243-torsion spring; 244-connecting block; 245-stop block; 246-insertion rod; 251-sleeve; 252-connecting rod; 253-sliding rod. DETAILED DESCRIPTION

[0051] The example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present invention will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0052] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present utility model. However, those skilled in the art will appreciate that the technical solution of the present utility model can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present utility model.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those shown or described.

[0054] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0055] Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] See also Figure 1-Figure 10 The utility model provides a technical solution: a wind tunnel ladder safety extension device, comprising a ladder 1, the ladder 1 comprising a first side bar 11 and a first cross bar 12, a plurality of first cross bars 12 are fixedly connected between two first side bars 11, and an extension device 2 is installed on the ladder 1.

[0057] The extension device 2 includes an additional component 21, a lifting component 22, a handle 23 and a limit component 24. The additional component 21 is installed on the outside of the first side rod 11, and the lifting component 22 is installed on the additional component 21. Two groups of limit components 24 are symmetrically installed on the lifting component 22. Pulling up the handle 23 makes the lifting component 22 rise, and the limit component 24 limits the position of the handle 23. Then the lifting component 22 is completely extended out of the wind tunnel, which is convenient for the operator to climb and maintain a climbing posture outside the wind tunnel. The additional component 21 is conveniently fixed and installed on the outside of the existing ladder 1 to achieve safe extension.

[0058] The additional component 21 includes a spliced ​​side frame 211, a mounting block 212, a clamping rod 213 and a bolt 214, wherein the mounting block 212, the clamping rod 213 and the bolt 214 constitute an installation component, and the installation component is detachably connected to the first cross bar 12 to install the additional component 21 on the ladder.

[0059] The outer sides of the two first side bars 11 are symmetrically slidably connected with the splicing side frames 211, and the inner sides of the splicing side frames 211 are provided with grooves. The two first side bars 11 are respectively arranged on the inner sides of the grooves of the two splicing side frames 211, and the outer sides of the first side bars 11 are slidably connected with the grooves. Each spliced ​​side frame 211 is provided with three groups of mounting blocks 212, each group of mounting blocks 212 has four members, and each group of four mounting blocks 212 is respectively arranged at the front upper, front lower, rear upper and rear lower of the first cross bar 12, and the spacing between the two upper mounting blocks 212 and the two lower mounting blocks 212 vertically corresponding thereto is equal to the thickness of the first cross bar 12, and a card slot is provided on the inner side of each mounting block 212, and a card rod 213 is slidably connected to the inner side of each group of four mounting blocks 212, and a bolt 214 is threadedly connected to the outer side of the card rod 213, and the bolt 214 is arranged on the rear side of the rear mounting block 212, and the card rod 213 is arranged in a "U" shape, and the outer side of the card rod 213 is slidably connected to the corresponding card slot, and the card slot runs through the front end face and the rear end face of the mounting block 212. When the device is in use, The installation can be performed on the existing ladder 1, the groove of the installation component 21 is aligned with the first side bar 11, and then the installation component 21 is sleeved on the outside of the first side bar 11, and each group of four mounting blocks 212 is moved close to the first cross bar 12, and each group of four mounting blocks 212 is respectively arranged at the front upper, front lower, rear upper and rear lower of the first cross bar 12, and then the U-shaped clamping rod 213 is horizontally inserted into the mounting block 212, and the clamping rod 213 is inserted from the mounting block 212 on the front side and passes through the mounting block 212 on the rear side, and then the bolt 214 is screwed on the outside of the rear end of the mounting block 212, thereby completing the installation of the clamping rod 213, and a group of mounting blocks 212 on the two spliced ​​side frames 211 are respectively installed on the left and right ends of each first cross bar 12, and the spliced ​​side frames 211 are fixed by the clamping rod 213 for limiting the position, thereby completing the fixation of the spliced ​​side frames 211.

[0060] The lifting assembly 22 includes a slide bar 221, a top block 222, a second side bar 223, a second cross bar 224 and a limit block 225. The inner sides of the two splicing side frames 211 are provided with symmetrical limit grooves. The inner side wall of the limit groove is slidably connected to the slide bar 221. The top of the slide bar 221 is fixedly connected to the top block 222. The bottom of the top block 222 is fixedly connected to the second side bar 223. A plurality of second cross bars 224 are fixedly connected between the two second side bars 223. The interval between the second cross bars 224 is 30 cm. The front end surface of the splicing side frame 211 is fixedly connected to the limit block 225, the outer side of the second side rod 223 is slidably connected with the limit block 225, and the second side rod 223 penetrates the surface of the limit block 225. When the operator enters and exits the wind tunnel, the handle 23 is pulled upward, and the handle 23 pulls the top block 222 to move upward, and the top block 222 drives the slide bar 221 and the second side rod 223 to move upward, and the slide bar 221 slides in the limit groove of the splicing side frame 211, and the limit groove of the splicing side frame 211 limits the splicing side frame 211. The top blocks 222 on the two slide bars 221 are connected by the handle 23, so that the handle 23 can only move up and down. The second side bar 223 slides in the limiting block 225 to limit the second side bar 223 for a second time, thereby reducing the second side bar 223 from shaking randomly when a user steps on the second cross bar 224 due to the toughness of the material itself. The position of the second side bar 223 maintained by the limiting assembly 24 ensures that the second cross bar 224 is completely placed above the ladder 1, that is, above the wind tunnel, so that the user can enter and exit the wind tunnel above the wind tunnel. Just keep the posture of climbing the ladder. When entering, first step on the second horizontal bar 224 and hold the second side bar 223 or the second horizontal bar 224 or even the handle 23 to keep the body stable. Then climb down safely and slowly. After stepping on the second horizontal bar 224 at the bottom, step on the first horizontal bar 12 to continue climbing in. When coming out, climb on the second horizontal bar 224 until you are completely out of the wind tunnel and your feet can directly reach the ground of the wind tunnel. The operator can step from the second horizontal bar 224 to the ground, which greatly reduces the risk of the operator falling into the wind tunnel.

[0061] Each set of limiting components 24 is arranged between the two second cross bars 224 located at the bottom end. Each set of limiting components 24 includes a fixed sleeve 241, a rotating sleeve 242, a torsion spring 243, a connecting block 244, a stopper 245 and an insertion rod 246. The outer side of the second side bar 223 is fixedly connected to the fixed sleeve 241, and a rotating groove is opened on the outer side of the fixed sleeve 241. The inner side wall of the rotating groove is rotatably connected to the rotating sleeve 242 through a rotating shaft. The torsion spring 243 is fixedly connected between the top of the rotating sleeve 242 and the inner side wall of the rotating groove. The outer side of the rotating sleeve 242 is fixedly connected to the connecting block 244. The outer side of the connecting block 244 is slidably connected to the fixed sleeve 241. The side of the connecting block 244 away from the fixed sleeve 241 is fixedly connected to the stopper 245. The bottom end of the stopper 245 is fixedly connected to the insertion rod 246. The top of the first side bar 11 is opened with a slot. The rotation trajectory of the insertion rod 246 is arc-shaped. The rotation trajectory of the insertion rod 246 intersects with the extension line of the slot. The stopper 245 is placed on the first side bar 11 to limit the position of the fixing sleeve 241, and the stopper 245 is placed above the first side bar 11 to limit the position of the second side bar 223, preventing the second side bar 223 from continuing to move downward. At this time, the position maintained by the second side bar 223 makes the second cross bar 224 completely placed above the ladder 1, that is, above the wind tunnel.

[0062] The ladder 1 is also provided with a toggle assembly 25 for resetting the limit assembly 24. The toggle assembly 25 includes a sleeve 251, a connecting rod 252 and a toggle rod 253. The rear end of the handle 23 is fixedly connected to the sleeve 251, the inner side of the sleeve 251 is slidably connected to the connecting rod 252, and the bottom end of the connecting rod 252 is fixedly connected to the toggle rod 253. The connecting rod 252 is arranged in a "T" shape, and the movement trajectory of the toggle rod 253 is linear. The block 245 is arranged on the movement trajectory of the toggle rod 253, and the outer side of the block 245 is slidably connected to the toggle rod 253. When the operator enters and exits the wind tunnel, he first pulls up the connecting rod 252, so that the toggle rod 253 moves upward to the top of the block 245, pulls up the handle 23, and the insertion rod 246 rotates to the top of the slot of the first side rod 11, then puts down the handle 23, the second side rod 223 moves downward, the insertion rod 246 is inserted into the slot, and the block 2 The first side bar 11 is then released to limit the position of the fixing sleeve 241. At this time, the first side bar 11 also limits the stopper 245 to prevent the stopper 245 from rotating at will. The lever 253 is released and placed on the stopper 245 to maintain the position of the lever 253. The lever 253 is placed above the stopper 245. After use, the handle 23 can be pulled up to separate the insertion rod 246 from the first side bar 11. The connecting rod 252 is then pressed downward on the sleeve 251 so that the lever 253 presses the stopper 245 to rotate forward. The handle 23 is then slowly lowered and the stopper 245 moves downward. The wedge-shaped setting of the stopper 245 itself allows the stopper 245 to continue to rotate forward after releasing the first cross bar 12 and the spliced ​​side frame 211. Then the stopper 245 slides on the front side of the slide bar 221. At this time, the handle 23 and the toggle assembly 25 are both placed in the wind tunnel.

[0063] Working principle:

[0064] When the device is in use, it can be installed on the existing ladder 1, and the groove of the installation component 21 is aligned with the first side bar 11, and then the installation component 21 is sleeved on the outside of the first side bar 11, and each group of four mounting blocks 212 moves close to the first cross bar 12, and each group of four mounting blocks 212 are respectively arranged at the front upper, front lower, rear upper and rear lower of the first cross bar 12, and then the U-shaped clamping rod 213 is horizontally inserted into the mounting block 212, and the clamping rod 213 is inserted from the mounting block 212 on the front side and passes through the mounting block 212 on the rear side, and then the bolt 214 is screwed on the outside of the rear end of the mounting block 212, thereby completing the installation of the clamping rod 213, and a group of mounting blocks 212 on the two spliced ​​side frames 211 are respectively installed on the left and right ends of each first cross bar 12, and the spliced ​​side frames 211 are fixed by the clamping rod 213 to complete the fixation.

[0065] When the operator enters or exits the wind tunnel, he first pulls up the connecting rod 252, so that the lever 253 moves upward to the top of the stopper 245, and then pulls up the handle 23. The handle 23 pulls the top block 222 upward, and the top block 222 drives the slide bar 221 and the second side bar 223 to move upward. The slide bar 221 slides in the limiting groove of the splicing side frame 211, and the limiting groove of the splicing side frame 211 limits the splicing side frame 211. The top blocks 222 on the two slide bars 221 are connected by the handle 23, so that the handle 23 can only move up and down. The second side bar 223 moves upward to drive the fixing sleeve 241 to move upward, and the second side bar 223 slides in the limiting block 225 to perform a secondary limit on the second side bar 223 to reduce the second side bar 223 from shaking randomly due to the toughness of the material itself, which causes the user to step on the second cross bar 224. After the insertion rod 246 is completely separated from the splicing side frame 211, the bottom end of the insertion rod 246 moves to the first side bar 11 The torsion spring 243 drives the rotating sleeve 242 to rotate and reset, the rotating sleeve 242 drives the connecting block 244 to rotate, the connecting block 244 drives the stopper 245 to rotate, the stopper 245 drives the insertion rod 246 to rotate, the insertion rod 246 rotates just above the slot of the first side rod 11, and then the pull handle 23 is lowered, the second side rod 223 moves downward, the insertion rod 246 is inserted into the slot, and the stopper 245 is placed on the first side rod 11, thereby limiting the position of the fixing sleeve 241. At this time, the first side rod 11 also limits the stopper 245 to avoid blocking The block 245 is rotated at will, the lever 253 is released and placed on the stopper 245, and the position of the lever 253 is maintained. The lever 253 is placed above the stopper 245, and the stopper 245 is placed above the first side bar 11 to limit the position of the second side bar 223, so as to prevent the second side bar 223 from continuing to move downward. At this time, the position maintained by the second side bar 223 makes the second cross bar 224 completely placed above the ladder 1, that is, above the wind tunnel. When entering and exiting the wind tunnel, the posture of climbing the ladder can be maintained above the wind tunnel. Specifically:

[0066] When entering, first step on the second horizontal bar 224 and hold the second side bar 223 or the second horizontal bar 224 or even the handle 23 to keep the body stable, then climb down safely and slowly, and after stepping on the second horizontal bar 224 at the bottom, step on the first horizontal bar 12 to continue climbing in;

[0067] When coming out, climb on the second cross bar 224 until you are completely out of the wind tunnel and your feet can directly reach the ground of the wind tunnel. The operator can step onto the ground from the second cross bar 224, which greatly reduces the risk of the operator falling into the wind tunnel, improves the safety of the device, and is convenient for the existing ladder 1 to be installed. The extension is completed when the ladder 1 itself exists, saving costs and no need to reinstall the entire thing. After use, the handle 23 can be pulled up to separate the insertion rod 246 from the first side rod 11, and then the connecting rod 252 can be pressed downward on the sleeve 251 so that the lever 253 presses the stopper 245 to rotate forward, and then the handle 23 is slowly lowered, and the stopper 245 moves downward. The wedge-shaped setting of the stopper 245 itself allows the stopper 245 to continue to rotate forward after releasing the first cross bar 12 and the spliced ​​side frame 211, and then the stopper 245 slides on the front side of the slide bar 221, and at this time the handle 23 and the toggle assembly 25 are both put into the wind tunnel.

[0068] In summary, through the installation component and the lifting component provided in the utility model, the position of the second side bar is maintained so that the second cross bar is completely placed above the ladder, that is, above the wind tunnel. When entering and exiting the wind tunnel, the posture of climbing the ladder can be maintained above the wind tunnel. When entering, first step on the second cross bar and hold the second side bar or the second cross bar or even the handle to keep the body stable, and then climb down safely and slowly. After stepping on the second cross bar at the bottom, step on the first cross bar to continue climbing in. When coming out, climb on the second cross bar until you are completely out of the wind tunnel and your feet can directly reach the ground of the wind tunnel. The operator can step from the second cross bar to the ground, which greatly reduces the risk of the operator falling into the wind tunnel, improves the safety of the device, and is convenient for the installation of the existing ladder. The extension is completed when the ladder itself exists, saving costs and there is no need to reinstall the entire ladder.

[0069] The utility model provides a toggle assembly, which is convenient for resetting the lifting assembly. The handle can be pulled up to separate the insertion rod from the first side rod, and then the connecting rod is pressed downward on the sleeve, so that the toggle rod presses the stopper to rotate forward, and then the handle is slowly lowered, and the stopper moves downward. The wedge-shaped setting of the stopper itself allows the stopper to continue to rotate forward after releasing the first cross bar and the spliced ​​side frame, and then the stopper slides on the front side of the slide rod. At this time, the handle and the toggle assembly are both placed in the wind tunnel to reduce space occupancy, and the wind tunnel can be covered or other operating equipment can be installed above.

[0070] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A wind tunnel ladder safety extension device, comprising: A ladder, comprising two first side bars and a plurality of first cross bars arranged between the two first side bars, characterized in that an extension device is installed on the ladder; The extension device comprises an additional component and a lifting component, wherein the additional component is installed on the outside of the first side bar, and the lifting component is installed on the additional component; The lifting assembly is provided with a handle, which can lift the lifting assembly. A limiting assembly is symmetrically installed on the lifting assembly. The limiting assembly is located at the bottom end of the lifting assembly and is used to limit the position of the handle.

2. The device according to claim 1, characterized in that The added components include a spliced ​​side frame and a mounting component; The spliced ​​side frame is slidably connected to the first side bar; The mounting assembly is arranged on the splicing side frame, is located on the inner side of the splicing side frame, and is detachably connected to the first cross bar, and is used for mounting the additional assembly on the ladder.

3. The device according to claim 2, characterized in that A groove is formed on the inner side of the splicing side frame, the first side bar is located on the inner side of the groove of the splicing side frame, and the outer side of the first side bar is slidably connected to the groove.

4. The device according to claim 2, characterized in that The mounting assembly comprises: at least three mounting blocks and a clamping rod; The at least three mounting blocks are arranged on the inner side of the spliced ​​side frame, and when the mounting assembly is installed on the ladder, the at least three mounting blocks surround the first crossbar in the middle; Each of the mounting blocks is provided with a through slot, the top end of the clamping rod is fixedly connected with a bolt, and the bottom end of the clamping rod passes through the slots of the at least three mounting blocks in sequence and is fixedly connected with the bolt.

5. The device according to claim 2, characterized in that The lifting assembly comprises: a sliding rod, a top block, two second side rods, a plurality of second cross rods and a limit block; The sliding rod is slidably mounted on the splicing side frame; The top block is fixedly mounted on the top end of the slide bar, and the bottom end of the top block is fixedly connected to the second side bar; The plurality of second cross bars are fixedly arranged between the two second side bars; The limit block is fixedly mounted on the front end surface of the splicing side frame, and the outer side of the second side bar is slidably connected to the limit block.

6. The device according to claim 5, characterized in that A limiting groove is provided on the inner side of the splicing side frame, and the sliding rod is slidably installed in the limiting groove.

7. The device according to claim 5, characterized in that The limiting assembly includes: a fixed sleeve, a rotating sleeve, a torsion spring, a connecting block, a stopper and an insert rod; The fixing sleeve is fixedly connected to the outer side of the second side rod; The rotating sleeve is rotatably connected to the fixed sleeve; The torsion spring is arranged between the fixed sleeve and the rotating sleeve; The connecting block is fixedly connected to the outer side of the rotating sleeve, and the outer side of the connecting block is slidably connected to the fixed sleeve; The stopper is fixedly connected to a side of the connecting block away from the fixing sleeve; The insertion rod is fixedly connected to the bottom end of the stopper, a slot is provided at the top end of the first side rod, the rotation track of the insertion rod is arc-shaped, and the rotation track of the insertion rod intersects with the extension line of the slot.

8. The device according to claim 7, characterized in that The limiting assembly is arranged between the two second cross bars located at the bottom end of the lifting assembly.

9. The device according to claim 7, characterized in that A rotation groove is provided on the outer side of the fixed sleeve, and the inner side wall of the rotation groove is rotatably connected to the rotation sleeve through a rotation shaft, and the torsion spring is fixedly connected between the top end of the rotation sleeve and the inner side wall of the rotation groove.

10. The device according to claim 7, characterized in that The extension device further comprises: a toggle assembly; The toggle assembly comprises a sleeve, a connecting rod and a toggle rod; The sleeve is fixedly connected to the rear end of the pull handle; The connecting rod is slidably connected to the sleeve; The shift rod is fixedly connected to the bottom end of the connecting rod, the shift rod is slidably connected to the outer side of the stopper, the movement track of the shift rod is linear, and the stopper is located on the movement track of the shift rod.

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