A construction lifting ladder

Abstract

The present invention relates to the field of ladders, and in particular to a construction lifting ladder. The ladder comprises a main frame, a ladder body, a retracting device and a locking mechanism; one end of the main frame is connected to the ground and the other end is connected to a high-rise floor; one end of the ladder body is hinged to the high-rise floor and the other end is freely suspended; the retracting device comprises a fixed pulley, a rope and a take-up wheel; the retracting device is used to pull the ladder body to be retracted; the locking mechanism is used to lock the ladder body when the ladder body is retracted to the top of the main frame; a damping spring is connected between the ladder body and the main frame. The present invention locks the ladder at the top by setting a locking mechanism, and even if the rope is loose or broken, the ladder body will not fall, which greatly reduces the potential safety hazard; and by setting a damping spring, the lowering speed of the ladder body is slowed down, which is safe and convenient.

Description

Technical Field

[0001] The invention relates to the field of ladders, and in particular to a construction lifting ladder. Background Art

[0002] In the pipe corridors of some buildings, factories and other facilities, ladders are usually required for people to climb, so as to facilitate the installation, repair and maintenance of pipelines and other equipment. However, due to the limited space and narrow corridors of the pipe corridor, fixed ladders will occupy the space of the pipe corridor, which is not conducive to the passage of people and affects the convenience of construction. Therefore, the relevant technology will set up a retractable ladder, which can be folded up when not in use, so that the limited space can be effectively utilized while meeting the needs of high-rise operations.

[0003] There are various ways to fold up ladders. Among them, the most space-saving, convenient and quick method is to hinge one end of the ladder to a high place, install a rope at the other end of the ladder, and hoist the entire ladder to the same height as the high floor through a fixed pulley. However, there are some safety hazards when hoisting the ladder to a high place. The ladder is hoisted by ropes. If the ropes are loose or broken, the ladder stored at a high place will fall from the height, which is very dangerous. When the ladder is further lowered, the gravitational potential energy of the ladder does positive work, and the lowering speed is very fast. If the ladder is lowered too fast, there will be safety hazards and it will generate a lot of noise. The operator needs to tighten the rope to slow down the lowering speed of the ladder. However, manual operation is not only time-consuming and labor-intensive, but also has poor results and is very dangerous.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] In view of the deficiencies of the prior art, one of the purposes of the present invention is to provide a construction lifting ladder to solve the problem that the existing ladder is easy to fall down after being folded.

[0006] Another object of the present invention is to solve the problem of too high speed when the ladder is lowered.

[0007] A construction lifting ladder of the present invention adopts the following technical solution: comprising:

[0008] The main frame is L-shaped as a whole, with one end of the main frame connected to the ground and the other end connected to the high-rise floor;

[0009] Ladder body, one end of the ladder body is hinged to the high-rise floor slab and the other end is freely suspended;

[0010] The retracting and releasing device comprises a fixed pulley, a rope and a take-up wheel. The fixed pulley is arranged on the top of the main frame at a side away from the high-rise floor. The take-up wheel is rotatably arranged at the bottom of the main frame. One end of the rope is fixed to the cantilever end of the ladder body, the middle part is wound around the fixed pulley, and the other end is connected to the take-up wheel. A torsion spring is arranged at the rotating shaft of the take-up wheel. The torsion spring enables the take-up wheel to have a rotation tendency to reel in the rope.

[0011] The locking mechanism is arranged at the top of the main frame, and is used to lock the ladder body when the ladder body is folded to the top of the main frame.

[0012] Optionally, the locking mechanism includes a locking wheel, a lifting bracket is provided on the top of the main frame, the locking wheel is provided on the lifting bracket and has a rotating state and a non-rotating state, a slot is provided on the upper surface of the cantilever end of the ladder body, after the ladder body is fully retracted, the slot cooperates with the locking wheel and the locking wheel is in the non-rotating state to prevent the ladder from falling, and when the ladder body is lowered, the locking wheel switches to a rotating state to allow the ladder body to be lowered.

[0013] Optionally, the locking wheel includes a main wheel body and side ratchets located on both sides of the main wheel body, the ratchet teeth of the side ratchets can cooperate with the card slots, and a pawl is hinged on the top of the lifting bracket, and the pawl cooperates with the side ratchets so that the locking wheel rotates when the ladder body is lowered;

[0014] A stop plate is arranged between the two side ratchets, and along the rotation direction of the locking wheel, the stop plate is located at the front side of the pawl; the stop plate is hinged to the lifting bracket, and a threading hole is arranged on the stop plate below its hinge point, and the threading hole is used to pass the rope, and the stop plate has a first state and a second state; when the stop plate is in the first state, the stop plate is upright to prevent the pawl from swinging; when the stop plate is in the second state, the stop plate is tilted to allow the pawl to swing.

[0015] Optionally, the slot of the card slot is provided with an elastic retractable plate.

[0016] Optionally, the upper portion of the stop plate is an elastic telescopic structure and is initially in an extended state. A limiting groove is provided on the top of the lifting bracket. The limiting groove has a vertical stop surface and an arc-shaped guide surface connected to the vertical stop surface. The vertical stop surface is located in front of the arc-shaped guide surface along the rotation direction of the locking wheel. When the upper end of the stop plate is located in the limiting groove and fits the vertical stop surface, the stop plate is in the first state.

[0017] One end of the rope connected to the ladder body is provided with a section of energy storage spring, and a pushing structure is provided on the rope. The pushing structure is located on the side of the stop plate close to the pawl and can stop the stop plate mutually. A conical block is provided on the rope, and the conical block is located on the side of the stop plate away from the pawl. When the ladder body is fully lowered to the ground, the conical block abuts against the stop plate.

[0018] Optionally, the pushing structure is a pushing block.

[0019] Optionally, the pushing structure is a knot.

[0020] Optionally, a wire taking-up box is provided at the bottom of the main frame, and the wire taking-up wheel is rotatably provided in the wire taking-up box, the small end of the conical block faces the wire taking-up box, the diameter of the small end of the conical block is equal to the diameter of the rope, and the side wall of the wire taking-up box is provided with a closing structure. In the initial state, the closing structure allows the conical block to enter the wire taking-up box and prevents the conical block from exiting the wire taking-up box.

[0021] Optionally, the closing structure includes two elastic pins arranged opposite to each other, the elastic pins are initially in a pop-up state, and a button is provided on the wire taking-up box, and the button is used to control the two elastic pins to move away from each other, thereby unlocking the closing structure.

[0022] Optionally, a damping spring is connected between the ladder body and the main frame.

[0023] The beneficial effect of the present invention is that a locking mechanism is provided in a construction lifting ladder of the present invention, and the locking mechanism can lock the ladder body and the main frame relative to each other when the ladder body is retracted to the top of the main frame. Even if the rope is loose or broken, the ladder body will not fall, which greatly reduces the safety hazard and improves the safety.

[0024] Furthermore, when the ladder body is retracted to the top, the rope will not be pulled out due to the cooperation of the conical block and the closing structure, and the rope and the locking mechanism work together to achieve double locking, further improving safety.

[0025] Furthermore, by providing a damping spring and a torsion spring at the take-up wheel, damping is continuously provided to the ladder body when the ladder body is lowered, thereby slowing down the lowering speed of the ladder body, which is safe and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a construction lifting ladder of the present invention;

[0028] Figure 2 It is a side view of a construction lifting ladder of the present invention;

[0029] Figure 3 for Figure 2 Middle AA section view (ladder body folded);

[0030] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0031] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0032] Figure 6 A top view of a construction lifting ladder is invented;

[0033] Figure 7 for Figure 6 Middle DD section view;

[0034] Figure 8 It is a structural schematic diagram of the locking wheel in the present invention;

[0035] Fig. 9 for Figure 8 Middle EE section view;

[0036] Fig.10 This is a schematic diagram of the ladder body in the present invention in the lowered state;

[0037] Fig.11 for Fig.10 Enlarged view of point F in the middle.

[0038] In the figure:

[0039] 100. High-rise floor;

[0040] 201, main frame; 202, rope; 203, fixed pulley; 204, take-up box; 205, cone block; 206, closing structure; 207, button; 208, take-up wheel; 209, torsion spring; 210, damping spring; 211, stop plate;

[0041] 310, locking wheel; 311, side ratchet; 312, main wheel body; 320, ratchet pawl; 330, limiting groove;

[0042] 400. Ladder body. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 11As shown, a construction lifting ladder provided by an embodiment of the present invention includes a main frame 201, a ladder body 400, a retracting device and a locking mechanism; the main frame 201 is L-shaped as a whole, one end of the main frame 201 is connected to the ground, and the other end is connected to a high-rise floor 100 at a high place; one end of the ladder body 400 is hinged to the high-rise floor 100, and the other end is freely suspended.

[0045] The retracting and releasing device includes a fixed pulley 203, a rope 202 and a take-up wheel 208. The fixed pulley 203 is arranged on the top of the main frame 201 on one side away from the high-rise floor 100. The take-up wheel 208 is rotatably arranged at the bottom of the main frame 201. One end of the rope 202 is fixed to the cantilever end of the ladder body 400, the middle part is wound around the fixed pulley 203, and the other end is connected to the take-up wheel 208. A torsion spring 209 is arranged at the rotating shaft of the take-up wheel 208. The torsion spring 209 enables the take-up wheel 208 to have a rotation tendency to reel in the rope 202. When the ladder is retracted, the rope 202 is pulled downward, the rope 202 is reeled by the take-up wheel 208, and the ladder is gradually lifted upward. When the ladder is lowered, the rope 202 is unlocked, the rope 202 overcomes the force of the torsion spring 209 and is gradually pulled out, thereby slowing down the lowering speed of the ladder body 400.

[0046] The locking mechanism is arranged at the top of the main frame 201, and is used to lock the ladder body 400 when the ladder body 400 is retracted to the top of the main frame 201, so as to prevent the ladder body 400 from falling from a height when the rope 202 is loose or broken, thereby improving safety. Furthermore, in order to ensure force balance and smooth operation, both sides of the ladder body 400 are provided with a retracting device and a locking mechanism.

[0047] In a further embodiment, the locking mechanism includes a locking wheel 310, a lifting bracket is provided on the top of the main frame 201, the locking wheel 310 is provided on the lifting bracket and has a rotating state and a non-rotating state, and a card groove is provided on the upper surface of the cantilever end of the ladder body 400. After the ladder body 400 is fully retracted, the card groove cooperates with the locking wheel 310 and the locking wheel 310 is in a non-rotating state to prevent the ladder from falling (the locking wheel 310 can hook the ladder body 400). When the ladder body 400 is lowered, the locking wheel 310 switches to a rotating state to allow the ladder body 400 to be lowered.

[0048] Furthermore, the locking wheel 310 includes a main wheel body 312 and side ratchets 311 located on both sides of the main wheel body 312, the ratchet teeth of the side ratchet 311 can cooperate with the slot, and a pawl 320 is hinged on the top of the lifting bracket. The pawl 320 cooperates with the side ratchet 311 so that the rotation direction of the locking wheel 310 is when the ladder body 400 is lowered. After the ladder body 400 is engaged with the side ratchet 311, the locking wheel 310 stops rotating and prevents the ladder body 400 from being lowered; the notch of the slot is provided with an elastic retractable plate so that the size of the slot can be changed, which facilitates the engagement of the slot with the side ratchet 311.

[0049] A stop plate 211 is arranged between the two side ratchets 311, and the stop plate 211 is located at the front side of the pawl 320 along the rotation direction of the locking wheel 310; the stop plate 211 is hinged to the lifting bracket, and a threading hole is arranged on the stop plate 211 below its hinge point, and the threading hole is used to pass the rope 202, and the stop plate 211 has a first state and a second state; when the stop plate 211 is in the first state, the stop plate 211 is upright to prevent the pawl 320 from swinging, thereby preventing the side ratchet 311 from rotating; when the stop plate 211 is in the second state, the stop plate 211 is tilted to allow the pawl 320 to swing, thereby allowing the side ratchet 311 to rotate.

[0050] Furthermore, the upper part of the stop plate 211 is an elastic telescopic structure and is initially in an extended state. A limiting groove 330 is provided on the top of the lifting bracket. The limiting groove 330 has a vertical blocking surface and an arc-shaped guide surface connected to the vertical blocking surface. The vertical blocking surface is located in front of the arc-shaped guide surface along the rotation direction of the locking wheel 310. When the upper end of the stop plate 211 is located in the limiting groove 330 and is in contact with the vertical blocking surface, the stop plate 211 is in the first state.

[0051] One end of the rope 202 connected to the ladder body 400 has a section of energy storage spring (not shown in the figure), and a pushing structure (not shown in the figure) is provided on the rope 202. The pushing structure is located on the side of the stop plate 211 close to the pawl 320 and can stop the stop plate 211. A conical block 205 is provided on the rope 202, and the conical block 205 is located on the side of the stop plate 211 away from the pawl 320. When the ladder body 400 is completely lowered to the ground, the conical block 205 abuts against the stop plate 211, and the conical block 205 pushes the stop plate 211 so that the stop plate 211 is deflected until its top is in the limit groove 330 and is pressed against the limit groove 330. At this time, the stop plate 211 is in the first state ( Fig.10 and Fig.11 The figure shows the state to be switched), and the pawl 320 is blocked from rotating when the ladder body 400 is fully retracted. When the ladder body 400 is lowered again, the rope 202 is reeled in forcefully to overcome the elastic force of the energy storage spring, and the rope 202 drives the push structure to move forward a short distance, and the push structure pushes the stop plate 211, and the stop plate 211 escapes from the limit groove 330, switches to the second state, and is tilted against the top surface of the hanging bracket, releasing the limit on the pawl 320, and the side ratchet 311 can rotate smoothly, and then the ladder body 400 can be lowered smoothly.

[0052] Specifically, the stop plate 211 includes a main board body and a top plate slidably inserted at the upper end of the main board body, and a support spring is arranged between the top plate and the main board body. The support spring makes the top plate tend to move away from the main board body (that is, the stop plate 211 is in an extended state in the initial state), and the top plate can be stuck in the limit groove 330 or detached from the limit groove 330.

[0053] Furthermore, in a preferred embodiment of the present invention, the pushing structure is a pushing block or a rope knot.

[0054] In a further embodiment, a wire taking-up box 204 is provided at the bottom of the main frame 201, and a wire taking-up wheel 208 is rotatably provided in the wire taking-up box 204, the small end of the conical block 205 faces the wire taking-up box 204, and the diameter of the small end of the conical block 205 is equal to the diameter of the rope 202, and a closing structure 206 is provided on the side wall of the wire taking-up box 204. In an initial state, the closing structure 206 allows the conical block 205 to enter the wire taking-up box 204 and prevents the conical block 205 from exiting the wire taking-up box 204. After the closing structure 206 is controlled to open, the conical block 205 can be pulled out of the wire taking-up box 204 to unlock the rope 202. Pulling the rope 202 downward can retract the ladder body 400 upward. When the ladder body 400 is received at the top, the conical block 205 is pulled into the wire box 204 under the action of the torsion spring 209 at the reel. After entering the wire box 204, the conical block 205 prevents the rope 202 from being pulled out of the wire box 204, thereby making it impossible for the ladder body 400 to be lowered. The rope 202 is locked. The rope 202 and the locking mechanism work together to lock the ladder body 400, further improving safety. When the ladder body 400 needs to be lowered, the closing structure 206 can be controlled to open.

[0055] In a further embodiment, the closing structure 206 includes two relatively arranged spring pins, the spring pins are initially in a pop-up state, and a button 207 is provided on the wire taking-up box 204, and the button 207 is used to control the two spring pins to move away from each other, thereby unlocking the closing structure 206.

[0056] Specifically, the button 207 can control the unlocking of the spring pin by electromagnetic control, or by mechanical control.

[0057] In a further embodiment, a damping spring 210 is connected between the ladder body 400 and the main frame 201, and the damping spring 210 is used to provide a damping force during the lowering process of the ladder body 400, further slowing down the lowering speed of the ladder body 400. Specifically, a connecting plate is provided on the ladder body 400, one end of the rope 202 and one end of the damping spring 210 are connected to the connecting plate, and the other end of the damping spring 210 is connected to the hanging bracket.

[0058] In combination with the above embodiments, the use principle and working process of the present invention are as follows:

[0059] When the ladder body 400 is in a fully lowered state, the rope 202 is pulled out of the wire box 204, and the conical block 205 pushes the lower part of the stop plate 211 so that the upper end of the stop plate 211 swings into the limit groove 330. The stop plate 211 cannot escape from the limit groove 330 due to the action of the supporting spring inside it, and is in an upright state, thereby blocking the swing of the pawl 320 and finally limiting the rotation of the side ratchet 311.

[0060] When the ladder body 400 is retracted, the ropes 202 on both sides are pulled at the same speed at the same time, and the elongated ropes 202 are reeled in by the take-up wheel 208 with the torsion spring 209. In the process of pulling the ropes 202, the ladder body 400 gradually rises, and the slot at the cantilever end of the ladder body 400 gradually approaches the side ratchet 311. When the ladder body 400 is fully hoisted, the ratchet teeth of the side ratchet 311 are hooked into the slot of the ladder body 400 (refer to Figure 4 At this time, due to the obstruction of the stop plate 211, the pawl 320 cannot swing upward ( Figure 4 The side ratchet 311 cannot rotate, and the locking wheel 310 cannot rotate, locking the ladder body 400. This limit cannot be released even if the rope 202 breaks. At the same time, the conical block 205 is also pulled to the position of the wire box 204. Under the action of the torsion spring 209 in the wire box 204, the conical block 205 is squeezed through the closing structure 206. The closing structure 206 limits the conical block 205. When the closing structure 206 is in a locked state, the rope 202 cannot be pulled out, and the ladder body 400 cannot be lowered. In this way, the ratchet and the rope 202 work together to achieve double locking, reducing safety hazards.

[0061] When lowering the ladder body 400, first press the button 207 to open the closing structure 206, pull the conical block 205 out of the wire box 204, and then continue to pull the ropes 202 on both sides with force. The pulling direction is the same as the pulling direction when the ladder body 400 is folded up. After the rope 202 is pulled hard and quickly, the rope 202 overcomes the elastic force of the energy storage spring and moves forward a short distance. The knot or push block on the rope 202 pushes the stop plate 211, causing the stop plate 211 to swing ( Figure 4The upper end of the stop plate 211 is disengaged from the limit groove 330, the stop plate 211 releases the restriction on the pawl 320, and the side ratchet 311 can rotate; thereafter, the ladder body 400 is automatically lowered under the action of gravity. During the lowering process of the ladder body 400, the damping spring 210 is continuously stretched, and the torsion force of the torsion spring 209 at the take-up wheel 208 and the tension of the damping spring 210 form a damping for the free lowering of the ladder body 400, so that the ladder body 400 still descends relatively slowly even during the free lowering process. Until the ladder body 400 is almost completely lowered to the ground, the conical block 205 resists the stop plate 211. Under the tension of the ladder body 400, the conical block 205 pushes the stop plate 211, and the stop plate 211 is re-engaged in the limit groove 330, and the lowering of the ladder body 400 is completed.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction lifting ladder, characterized in that: include: The main frame is L-shaped as a whole, with one end of the main frame connected to the ground and the other end connected to the high-rise floor; Ladder body, one end of the ladder body is hinged to the high-rise floor slab and the other end is freely suspended; The retracting and releasing device comprises a fixed pulley, a rope and a take-up wheel. The fixed pulley is arranged on the top of the main frame at a side away from the high-rise floor. The take-up wheel is rotatably arranged at the bottom of the main frame. One end of the rope is fixed to the cantilever end of the ladder body, the middle part is wound around the fixed pulley, and the other end is connected to the take-up wheel. A torsion spring is arranged at the rotating shaft of the take-up wheel. The torsion spring enables the take-up wheel to have a rotation tendency to reel in the rope. A locking mechanism, which is arranged at the top of the main frame and is used to lock the ladder body when the ladder body is retracted to the top of the main frame; The locking mechanism includes a locking wheel. A hanging bracket is provided on the top of the main frame. The locking wheel is provided on the hanging bracket and has a rotating state and a non-rotating state. A card slot is provided on the upper surface of the cantilever end of the ladder body. When the ladder body is fully retracted, the card slot cooperates with the locking wheel and the locking wheel is in a non-rotating state to prevent the ladder from falling. When the ladder body is lowered, the locking wheel switches to a rotating state to allow the ladder body to be lowered. The locking wheel includes a main wheel body and side ratchets located on both sides of the main wheel body, the ratchet teeth of the side ratchets can cooperate with the card slots, and a pawl is hinged on the top of the lifting bracket. The pawl cooperates with the side ratchets so that the locking wheel rotates when the ladder body is lowered; A stop plate is arranged between the two side ratchets, and along the rotation direction of the locking wheel, the stop plate is located at the front side of the ratchet; the stop plate is hinged to the lifting bracket, and a threading hole is arranged on the stop plate below its hinge point, and the threading hole is used to pass the rope, and the stop plate has a first state and a second state; when the stop plate is in the first state, the stop plate is upright to prevent the ratchet from swinging; when the stop plate is in the second state, the stop plate is tilted to allow the ratchet to swing; The upper part of the stop plate is an elastic telescopic structure and is initially in an extended state. A limiting groove is provided on the top of the lifting bracket. The limiting groove has a vertical stop surface and an arc-shaped guide surface connected to the vertical stop surface. The vertical stop surface is located in front of the arc-shaped guide surface along the rotation direction of the locking wheel. When the upper end of the stop plate is located in the limiting groove and fits the vertical stop surface, the stop plate is in the first state. One end of the rope connected to the ladder body is provided with a section of energy storage spring, and a pushing structure is provided on the rope. The pushing structure is located on the side of the stop plate close to the pawl and can stop the stop plate mutually. A conical block is provided on the rope, and the conical block is located on the side of the stop plate away from the pawl. When the ladder body is fully lowered to the ground, the conical block abuts against the stop plate.

2. A construction lifting ladder according to claim 1, characterized in that: The slot of the card slot is provided with an elastic retractable plate.

3. A construction lifting ladder according to claim 1, characterized in that: The pushing structure is a pushing block.

4. A construction lifting ladder according to claim 1, characterized in that: The pushing structure is a rope knot.

5. A construction lifting ladder according to claim 1, characterized in that: A wire-taking box is arranged at the bottom of the main frame, and the wire-taking wheel is rotatably arranged in the wire-taking box. The small end of the conical block faces the wire-taking box, and the diameter of the small end of the conical block is equal to the diameter of the rope. A closing structure is arranged on the side wall of the wire-taking box. In the initial state, the closing structure allows the conical block to enter the wire-taking box and prevents the conical block from exiting the wire-taking box.

6. A construction lifting ladder according to claim 5, characterized in that: The closing structure includes two elastic pins arranged opposite to each other. The elastic pins are initially in an ejected state. A button is provided on the wire take-up box. The button is used to control the two elastic pins to move away from each other, thereby unlocking the closing structure.

7. A construction lifting ladder according to claim 1, characterized in that: A damping spring is connected between the ladder body and the main frame.

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