A retractable ladder for the entrance and exit of a power tunnel

Abstract

The present invention belongs to the technical field of ladders for tunnel entrances and exits, and specifically discloses a telescopic ladder for the entrances and exits of power tunnels, including a fixed section ladder, a telescopic section ladder and a supporting section; the fixed section ladder is sleeved on the outside of the telescopic section ladder, and is slidably connected to the telescopic section ladder; the telescopic section ladder and the supporting section are rotatably connected through a folding joint lock; the supporting section is provided with a groove on one side facing the telescopic section ladder, a transverse support rod is provided in the groove, and the transverse support rod is connected to the supporting section through a rotating shaft. The present invention is provided with a telescopic section ladder, which can be raised from the well to the part above the ground, and is built into the fixed section ladder when not in use. When in use, it is stretched to a fixed position through the top handle, and personnel can pass through this section to the fixed section ladder below the wellhead without bending over or climbing down.

Description

Technical Field

[0001] The invention belongs to the technical field of ladders for tunnel entrances and exits, and in particular relates to a telescopic ladder for an electric power tunnel entrance and exit. Background Art

[0002] At present, the ladders at the entrances and exits of domestic power tunnels are all ordinary vertical ladders. When entering from the wellhead, you need to hold the well edge on the ground, step on the ladder step by step, and then descend to the bottom of the tunnel. This design has been used for many years. With the increasing number of equipment in the tunnel, the requirements for daily inspections are constantly increasing, so entering and exiting the wellhead has become normalized. As an important carrying tool for the entrance and exit, the ladder has many problems, causing inconvenience in work.

[0003] At present, there are several problems with the entrance and exit ladders:

[0004] 1. When the ground is wet and slippery after rain or snow, your hands may slip easily, causing safety risks;

[0005] 2. When climbing out of the well, in the final stage of climbing out, since there is no hand support, people need to use both hands to support both sides to climb out. This is laborious and can easily cause a fall due to insufficient hand strength;

[0006] 3. Due to the mass production, there is no customized production after measuring the wellhead depth. Therefore, many wellheads have different depths, causing the ladder to be too high from the bottom of the well, causing safety risks.

[0007] 4. According to safety regulations, when the wellhead is open, a fence must be set up at the wellhead and a conspicuous sign must be placed for reminder. Such equipment needs to be carried extra, so each inspection must be equipped with a vehicle, which is time-consuming and laborious.

[0008] Therefore, providing a new telescopic ladder for the entrance and exit of a power tunnel is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0009] The purpose of the present invention is to overcome the defects of the background technology and provide a telescopic ladder for the entrance and exit of a power tunnel.

[0010] The present invention provides a telescopic ladder for an entrance and exit of a power tunnel, comprising a fixed-section ladder, a telescopic-section ladder and a supporting section;

[0011] The telescopic section ladder is rotatably connected to the supporting section via a folding joint lock;

[0012] The fixed section ladder is sleeved on the outside of the telescopic section ladder and the supporting section, and is slidably connected to the telescopic section ladder;

[0013] A groove is provided on one side of the support section facing the telescopic section ladder, a transverse support rod is arranged in the groove, and the transverse support rod is connected to the support section via a rotating shaft.

[0014] A further solution is that the fixed section ladder includes

[0015] Two fixed columns and a fixed ladder connected to the fixed columns;

[0016] The fixed ladder is provided with grooves for embedding the telescopic ladder section and the supporting section.

[0017] A further solution is that the telescopic ladder comprises:

[0018] Two vertical square tubes, used for sliding connection with the fixed section ladder; and

[0019] A plurality of short horizontal tubes for climbing are arranged between the vertical square tubes, and the two ends of the short horizontal tubes are respectively fixedly connected to the two vertical square tubes;

[0020] Each of the vertical square tubes is provided with a vertical sliding rod on one side away from the horizontal short tube;

[0021] The fixed section ladder is provided with a track relative to the inner wall;

[0022] The slide bar is located in the track.

[0023] A further solution is that a plurality of spring latches are provided on a side of each vertical square tube away from the horizontal short tube;

[0024] The fixed section ladder is provided with limit holes at positions corresponding to the inner wall, the number of which is the same as the number of the spring latches;

[0025] When the telescopic ladder is extended to a fixed height, the spring latch is inserted into the limiting hole to fix the telescopic ladder.

[0026] A further solution is that the support section includes two support rods arranged in parallel;

[0027] A limiting column is arranged on one side of one of the support rods away from the telescopic ladder, and a mounting groove is provided on the other side of the square steel support rod away from the telescopic ladder, a stopper is arranged in the mounting groove, one end of the stopper rod is rotatably connected to the support section, and a bayonet is arranged on one end of the stopper rod;

[0028] The limiting column and the blocking rod together constitute an anti-mistaken entry component.

[0029] A further solution is that a solar panel and a warning light are arranged on the top of the telescopic ladder, and the solar panel and the warning light are electrically connected. The warning light is a flashing light.

[0030] A further solution is that a reflective strip is provided on the front side of the telescopic ladder, and the reflective strip is bonded to the telescopic ladder.

[0031] Preferably, a lifting device is provided at the top of the telescopic ladder to control the extension and retraction of the spring latch;

[0032] The end of the spring bayonet is fixed by a connecting rod, and the connecting rod is fixedly connected with a steel wire rope;

[0033] A first pulley and a second pulley are fixedly arranged in each vertical square tube, and a third pulley is arranged in the top transverse short tube of the spring bayonet;

[0034] The steel wire rope is sequentially wound around the first pulley, the second pulley and the third pulley;

[0035] The top end of the steel wire rope is connected to the lifting device. By pulling the lifting device, the steel wire rope is driven to rotate along the third pulley, the second pulley and the first pulley respectively, thereby driving the connecting rod to move rightward / leftward, pulling the pin head of the spring latch pin to a suitable position (limiting hole), releasing the lifting device so that the pin head is stuck in the limiting hole.

[0036] Preferably, a push switch is provided in the installation slot, and the blocking rod is rotatably connected to the push switch. When the blocking rod does not need to be taken out, the push switch is in a closed state, and at this time, the top of the push switch is lower than the upper surface of the installation slot. When the blocking rod needs to be clamped on the limit column, the push switch is turned on, and the push switch drives the blocking rod to pop up, so that the blocking rod is higher than the upper surface of the installation slot. By rotating the blocking rod position, the blocking rod is clamped on the limit column, which plays a role in preventing accidental entry.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The present invention is provided with a telescopic ladder, which can be raised from the well to the part above the ground. When not in use, it is built into the fixed ladder. When in use, it is stretched to a fixed position by the top handle. A person can go down to the fixed ladder below the wellhead through this section without bending over or climbing down.

[0039] (2) The present invention is provided with a support section and a transverse support rod, which can ensure that the telescopic section ladder can remain stable after it is raised above the ground. By using the triangular stability theory, the support section is used to support the telescopic section to form a triangular structure to keep the telescopic section as a whole from displacement and shaking.

[0040] (3) The anti-accidental entry assembly of the present invention can be manually closed after the construction personnel go down the well, thereby sealing off the wellhead area to prevent accidental entry and falling.

[0041] (4) The night light warning component adopts a solar battery flashing light design. The flashing light is installed on the top of the telescopic section. When the telescopic section rises to the well surface, the light automatically charges the light, so that the warning light flashes, which plays a safety and warning role.

[0042] (5) The present invention can form a complete reflective warning effect at night by bonding reflective strips above the ground, thereby improving nighttime work safety.

[0043] (6) The present invention embeds the transverse support rod inside the support section. When not in use, the transverse support rod can be stored in the support section, which reduces the volume of the present invention and is easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The following drawings are only used to illustrate and explain the present invention, and are not used to limit the scope of the present invention, wherein:

[0045] Figure 1 : Schematic diagram of the structure of the present invention;

[0046] Figure 2 : Schematic diagram of fixed section ladder structure;

[0047] Figure 3 : Schematic diagram of telescopic ladder structure;

[0048] Figure 4 : Support segment support state diagram;

[0049] Figure 5 :A part enlarged schematic diagram;

[0050] Figure 6 : The present invention uses a state diagram;

[0051] Figure 7 : Top view of fixed section ladder;

[0052] Figure 8 : Schematic diagram of vertical square tube structure;

[0053] Fig. 9 : Schematic diagram of the push switch structure;

[0054] Fig.10 : Schematic diagram of spring bayonet linkage;

[0055] In the figure: 1 fixed section ladder, 2 telescopic section ladder, 3 support section, 4 folding joint lock, 5 limit column, 6 slide bar, 7 limit hole, 8 installation slot, 9 horizontal support bar, 10 warning light, 11 track, 12 rotating shaft, 13 spring latch, 14 stop bar, 15 first pulley, 16 second pulley, 17 third pulley, 18 wire rope, 19 connecting rod, 20 push switch, 21 fixed column, 22 fixed ladder. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] The present invention effectively solves the problem of inspection personnel having difficulty going down the well, allowing the personnel to go in and out of the well without exerting any effort on their hands, greatly reducing the intensity of work, while avoiding the problem of dirty hands or slipping and falling caused by rainy and snowy weather.

[0058] Example 1

[0059] 3. If Figure 1-5 As shown, the present invention provides a telescopic ladder for the entrance and exit of a power tunnel, comprising a fixed section ladder 1, a telescopic section ladder 2 and a support section 3; the fixed section ladder 1 is sleeved on the outside of the telescopic section ladder 2 and is slidably connected to the telescopic section ladder 2; the telescopic section ladder 2 and the support section 3 are rotatably connected through a folding joint lock 4; the support section 3 is provided with a groove on one side facing the telescopic section ladder 2, a transverse support rod 9 is provided in the groove, and the transverse support rod 9 is connected to the support section 3 through a rotating shaft 12. The fixed section ladder 1 comprises two fixed columns 21 and a fixed ladder 22 connected to the fixed columns; the fixed ladder 22 is provided with a groove for the telescopic section ladder 2 and the support section 3 to be embedded.

[0060] like Figure 3 As shown, the telescopic ladder 2 includes: two vertical square tubes for sliding connection with the fixed ladder 1; and a plurality of short horizontal tubes arranged between the vertical square tubes for climbing; a slide bar 6 is arranged on the outside of each vertical square tube; a track 11 is arranged on the inside of the fixed ladder 1; the slide bar 6 is slidably connected with the track 11, and the telescopic ladder 2 can be extended and retracted in the fixed ladder 1 by adopting the drawer principle, and a spring bayonet 13 is arranged on the outside of each vertical square tube; a limiting hole 7 is provided at the corresponding position of the inner side of the fixed ladder 1; the cooperation of the spring bayonet 13 and the limiting hole 7 can ensure that the telescopic ladder 2 is extended to a specified height. When the telescopic ladder 2 is extended to a fixed height, the spring bayonet 13 is inserted into the limiting hole 7 to fix the telescopic ladder 2.

[0061] Continue to see Figure 3 The support section 3 is composed of two square steels; a limiting column 5 is arranged on the front of one of the square steels, and a mounting groove 8 is opened on the front of the other square steel, and a blocking rod 14 is arranged in the mounting groove 8; the limiting column 5 and the blocking rod 14 together constitute an anti-mistaken entry component.

[0062] In this embodiment, a solar panel and a warning light 10 are provided on the top of the telescopic ladder 2, and the solar panel and the warning light 10 are electrically connected. The warning light 10 is a flashing light. When the telescopic section rises to the well surface, the light automatically charges the light, so that the warning light flashes, which plays a safety and warning role.

[0063] In this embodiment, a reflective strip is provided on the front of the telescopic ladder 2, and the reflective strip is bonded to the telescopic ladder 2, thereby improving the safety of nighttime work.

[0064] In the above scheme, the top view of the fixed section ladder 1 is as follows Figure 7 As shown, a groove is provided on the fixed ladder 22 of the fixed section ladder 1, and a protrusion is integrally formed on the side of the vertical square tube of the telescopic section ladder 2 away from the supporting section 3. During assembly, the protrusion is inserted into the groove, which can prevent the telescopic section ladder 2 from sliding out of the track 11 during the sliding process.

[0065] In the above solution, when the support section 3 is in the expanded state, Figure 4 As shown, the telescopic ladder 2, the support section 3 and the transverse support rod 9 form a right triangle, so that the entire device above the wellhead is in a stable state. When the telescopic ladder 2 is stretched to a specified height, the support section 3 and the telescopic ladder 2 can be formed into a certain angle by opening the folding joint lock 4. In this embodiment, the angle is 30°. After the angle is determined, the folding joint lock 4 is closed. The transverse support rod 9 rotates around the rotating shaft 12 to a horizontal state, abuts or clamps with the telescopic ladder 2 to form a stable structure.

[0066] In the above solution, a push switch 20 is provided in the mounting groove 8. Fig. 9 As shown, the blocking rod 14 is rotatably connected with the push switch 20. When the blocking rod 14 does not need to be taken out, the push switch 20 is in a closed state, and the top of the push switch 20 is lower than the upper surface of the installation groove 8. When the blocking rod 14 needs to be clamped on the limit column 5, the push switch 20 is turned on, and the push switch 20 drives the blocking rod 14 to pop up, so that the blocking rod 14 is higher than the upper surface of the installation groove 8. By rotating the position of the blocking rod 14, the blocking rod 14 is clamped with the limit column 5, which plays a role in preventing accidental entry.

[0067] The present invention effectively solves the problem of inspection personnel having difficulty going down the well, allowing the personnel to go in and out of the well without exerting any effort on their hands, greatly reducing the intensity of work, while avoiding the problem of dirty hands or slipping and falling caused by rainy and snowy weather.

[0068] At the same time, patrol personnel no longer need to carry and deploy fences and warning equipment, which greatly reduces the patrol workload and improves work efficiency.

[0069] Example 2

[0070] In order to further improve the stability of the telescopic ladder, on the basis of Example 1, three spring bayonet pins 13 are sequentially arranged on the outer side of each vertical square tube in this embodiment from top to bottom; three limit holes 7 are also sequentially opened from top to bottom at the corresponding positions on the inner side of the fixed ladder 1; in order to prevent the highest spring bayonet pin 13 of the telescopic ladder 2 from being stuck in the lowest limit hole 7 when being stretched, resulting in the defect of insufficient stretching height, this embodiment is achieved through the following linkage structure:

[0071] like Fig.10 As shown, the spring latch 13 is specifically a pull ring knob plunger, model GN717-QZ.

[0072] A lifting device is provided at the top of the telescopic ladder 2 to control the extension and retraction of the spring bayonet 13; the end pull ring of the spring bayonet 13 is fixed by a connecting rod 19, and the connecting rod 19 is fixedly connected with a wire rope 18; a first pulley 15 and a second pulley 16 are fixedly provided in each vertical square tube, and a third pulley 17 is provided in the top transverse short tube of the spring bayonet 13; the wire rope 18 is wound around the first pulley 15, the second pulley 16 and the third pulley 17 in sequence; the top of the wire rope 18 is connected to the lifting device. By pulling the lifting device, the wire rope 18 is driven to rotate along the third pulley 17, the second pulley 16 and the first pulley 15 respectively, and then the connecting rod 19 is driven to move to the right / left, and the pin head of the spring bayonet is pulled to a suitable position (limiting hole), and the lifting device is released so that the pin head is stuck in the limiting hole 7.

[0073] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A retractable ladder for the entrance and exit of a power tunnel, characterized in that: It comprises a fixed section ladder (1), a telescopic section ladder (2) and a supporting section (3); The telescopic section ladder (2) is rotatably connected to the support section (3) via a folding joint lock (4); The fixed section ladder (1) is sleeved on the outside of the telescopic section ladder (2) and the supporting section (3), and is slidably connected to the telescopic section ladder (2); The support section (3) is provided with a groove on one side facing the telescopic section ladder (2), a transverse support rod (9) is arranged in the groove, and the transverse support rod (9) is connected to the support section (3) via a rotating shaft (12); The support section (3) comprises two support rods arranged in parallel; A limiting column (5) is provided on a side of one of the support rods away from the telescopic section ladder (2), and a mounting groove (8) is provided on a side of the other square steel support rod away from the telescopic section ladder (2), a blocking rod (14) is provided in the mounting groove (8), one end of the blocking rod (14) is rotatably connected to the support section (3), and one end of the blocking rod (14) is provided with a bayonet; The limiting column (5) and the blocking rod (14) together constitute an anti-mistaken entry component; The telescopic ladder (2) comprises: two vertical square tubes, used for sliding connection with the fixed section ladder (1); and A plurality of short horizontal tubes for climbing are arranged between the vertical square tubes, and the two ends of the short horizontal tubes are respectively fixedly connected to the two vertical square tubes; Each of the vertical square tubes is provided with a vertical sliding rod (6) on a side away from the horizontal short tube; The fixed section ladder (1) is provided with a track (11) relative to the inner wall; The sliding rod (6) is located inside the track (11); Each of the vertical square tubes is provided with a plurality of spring latches (13) on one side away from the horizontal short tube; The fixed section ladder (1) is provided with limiting holes (7) at positions corresponding to the inner wall thereof, the number of which is the same as the number of the spring latches (13); When the telescopic ladder (2) is extended to a fixed height, the spring latch (13) is inserted into the limiting hole (7) to fix the telescopic ladder (2); A lifting device is provided at the top end of the telescopic ladder (2) for controlling the extension and retraction of the spring latch (13); The end of the spring latch (13) is fixed by a connecting rod (19), and the connecting rod (19) is fixedly connected to a steel wire rope (18); A first pulley (15) and a second pulley (16) are fixedly arranged in each of the vertical square tubes, and a third pulley (17) is arranged in the top transverse short tube of the spring latch (13); The steel wire rope (18) is sequentially wound around the first pulley, the second pulley (16) and the third pulley (17); The top end of the steel wire rope (18) is connected to the lifting device.

2. A telescopic ladder for the entrance and exit of a power tunnel according to claim 1, characterized in that: The fixed section ladder (1) comprises: Two fixed columns (21) and a fixed ladder (22) connected to the fixed columns; The fixed ladder (22) is provided with grooves for embedding the telescopic section ladder (2) and the supporting section (3).

3. The telescopic ladder for the entrance and exit of a power tunnel according to claim 1, characterized in that: A solar panel and a warning light (10) are provided on the top of the telescopic ladder (2), and the solar panel and the warning light (10) are electrically connected.

4. The telescopic ladder for the entrance and exit of a power tunnel according to claim 1, characterized in that: A reflective strip is provided on the side of the support section (3) away from the telescopic section ladder (2), and the reflective strip is bonded to the support section (3).

5. The telescopic ladder for the entrance and exit of a power tunnel according to claim 1, characterized in that: A push switch (20) is arranged in the installation groove (8), and the blocking rod (14) is rotatably connected to the push switch (20).

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