Pit ladder stand and elevator

Abstract

The pit ladder stand comprises a ladder stand main body, a traction assembly and a lock catch plate, the ladder stand main body has a first state and a second state, in the first state, the ladder stand main body lies on the pit ground, and in the second state, the ladder stand main body leans against a landing door sill; the traction assembly is in transmission connection with the ladder stand main body, and the traction assembly can lift the ladder stand main body and is used for controlling the ladder stand main body to be switched between a first state and a second state; the lock catch plate is movably mounted on the ladder stand main body, can be matched with the landing door sill and is used for controlling the ladder stand main body in the first state to be locked / unlocked on the landing door sill. The pit ladder stand can be suitable for the working condition environment with extremely compact well plane layout; according to the pit ladder stand, the ladder stand main body is arranged in the pit, and a maintainer can be prevented from falling off when climbing the ladder stand main body, so that the maintainer can conveniently enter and exit from the pit through the pit ladder stand, and the safety of the maintainer entering and exiting from the pit is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field related to ladders, and in particular relates to a pit ladder and an elevator. Background Art

[0002] When the pit of the elevator shaft reaches the necessary depth, a ladder must be installed in accordance with the national standard. Among them, conventional elevators are generally equipped with fixed ladders. In order to ensure the personal safety of maintenance personnel when using ladders, the distance between the back of the step and the wall of the upright fixed ladder should not be less than 280mm according to the national standard requirements, and when maintenance personnel enter and exit the pit by ladder, the ladder must exceed the ground of the first floor door opening by 1100mm. Because of these two provisions of the national standard, when the elevator runs to the bottom floor, the vertical space projection of the elevator body and the ladder will definitely overlap. In order to ensure that the elevator body and the ladder do not interfere with each other, the elevator body and the ladder can only be placed at different horizontal projection positions.

[0003] With the development of China's economy, land resources are becoming increasingly scarce. With the sharp rise in land costs, the requirements for shaft utilization are becoming increasingly higher. In order to install fixed ladders, the increase in civil engineering is no longer worth the cost. Due to the existence of the national standard for ladders, many elevator shafts have to change the standing fixed ladders into standing folding ladders to compress the horizontal installation space of the shaft by 280mm. However, there are very few shafts that cannot even meet the 50mm-100mm installation space required for folding ladders. In other words, when the existing shaft installation space cannot even meet the installation space of the standing folding ladder, it is necessary to develop a new shaft ladder to cope with such harsh shaft conditions. Utility Model Content

[0004] In view of this, it is necessary to provide a pit ladder and an elevator suitable for elevator working conditions where the hoistway plan layout is extremely compact and a standing pit ladder cannot be installed and national standard acceptance is required.

[0005] A pit ladder, comprising:

[0006] The ladder body has a first state and a second state. In the first state, the ladder body lies flat on the pit floor. In the second state, the ladder body leans against the hall door sill.

[0007] a pulling assembly, which is in transmission connection with the ladder body, and the pulling assembly can pull the ladder body, and is used to control the ladder body to switch between the first state and the second state;

[0008] A locking plate is movably mounted on the ladder body, and the locking plate can cooperate with the hall door sill to control the locking / unlocking of the ladder body in the first state on the hall door sill.

[0009] It can be understood that, through the above-mentioned structural arrangement, when the elevator is running, the pit ladder can lie flat on the pit floor, so that the existence of the pit ladder will not occupy the vertical space of the hoistway, and the elevator car and the hoistway wall can fit closer without being affected by the pit ladder, so that the pit ladder can be suitable for working conditions with extremely compact hoistway plan layout; when the pulling assembly switches the ladder body to lean against the hall door sill, the leaning ladder body can be locked on the hall door sill with a locking plate, so as to prevent maintenance personnel from falling off when climbing the ladder body. In this way, it is not only convenient for maintenance personnel to enter and exit the pit through the pit ladder, but also the safety of maintenance personnel entering and exiting the pit is ensured.

[0010] In one of the embodiments, the locking plate includes a connecting main board and a limit baffle, the connecting main board is rotatably mounted on the ladder body and connected to the limit baffle, and the limit baffle can be inserted into the door body slide groove of the hall door sill under the drive of the connecting main board to lock the ladder body.

[0011] It can be understood that, through the above-mentioned structural setting, the locking plate can realize the locking control of the ladder body leaning against the hall door sill by rotating on the ladder body and controlling the engagement between the limit baffle and the door body slide groove on the hall door sill. This makes it easier for maintenance personnel to operate and control the locking plate.

[0012] In one embodiment, the limit baffle includes a first plate body and a second plate body, and the first plate body is vertically connected to the connecting main board to trigger a trigger switch assembled on the ladder body;

[0013] The second plate body is arranged on the outer side of the connecting main plate body and connected to the first plate body, and is used for plugging and matching with the door body sliding groove.

[0014] In one of the embodiments, a locking piece is detachably connected to the ladder body, and the locking piece can pass through the locking plate and be connected to the ladder body, and is used to limit the locking plate to the ladder body, so that the locking plate is separated from the hall door sill and the ladder body is unlocked from the hall door sill.

[0015] It can be understood that, through the above-mentioned structural arrangement, maintenance personnel can use the locking member to limit the locking plate to the ladder body, which creates conditions for the subsequent use of the locking plate.

[0016] In one embodiment, a trigger switch is provided on the ladder main body. When the locking plate locks the ladder main body in the second state on the landing sill, the trigger switch can be triggered by the locking plate and generate a feedback signal.

[0017] The feedback signal is used to control the elevator to stop.

[0018] It can be understood that using the feedback signal generated when the trigger switch is triggered by the locking plate to control the elevator to stop can ensure the personal safety of maintenance personnel when entering the pit.

[0019] In one embodiment, the trigger switch is configured as a travel switch.

[0020] In one embodiment, the ladder main body includes two ladder tubes and multiple treads. The multiple treads are arranged at intervals along the length direction of the ladder tubes between the two ladder tubes and are respectively connected to the two ladder tubes.

[0021] The ladder tube has a support surface, and the support surface is configured as an inclined surface structure. When the ladder main body is in the second state, the ladder tube can be attached to the bottom pit floor through the support surface.

[0022] It can be understood that through the above structural arrangement, the contact area between the ladder main body leaning against the landing sill and the bottom pit floor can be increased, so as to increase the friction between the ladder tube and the bottom pit floor, and better prevent the bottom pit ladder from slipping and moving during use.

[0023] In one embodiment, the pulling component includes a pulling rope. One end of the pulling rope is fixed to the upper end of the ladder main body, and the other end of the pulling rope is fixed to the wall for maintenance personnel to grab.

[0024] Wherein, when the ladder main body is in the second state, the upper end of the ladder main body is arranged above the landing sill.

[0025] It can be understood that through the above structural arrangement, maintenance personnel can drive the ladder main body to switch between the first state and the second state by pulling the pulling rope, which is convenient for maintenance personnel to control the ladder main body.

[0026] In one embodiment, the pulling rope is configured as a chain, and one end of the chain is fixed to the ladder main body through a ring screw.

[0027] It can be understood that due to the structural characteristics of the chain, the pulling rope has the characteristics of being firm and moisture-resistant to meet the use requirements in the pit.

[0028] This application also provides an elevator, including the pit ladder described above.

[0029] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0030] The pit ladder and the elevator claimed in this application. The pit ladder can lie flat on the pit floor, so that the existence of the pit ladder does not occupy the vertical space of the hoistway, and makes the elevator car and the hoistway wall fit closer without being affected by the pit ladder. In this way, the pit ladder can be applicable to the working conditions with extremely compact hoistway plane layout; after the pulling component switches the ladder main body to lean against the landing sill, the leaning ladder main body can be locked to the landing sill with a locking buckle plate, so as to prevent the situation of detachment and falling when maintenance personnel climb the ladder main body. Thus, it is not only convenient for maintenance personnel to enter and exit the pit through the pit ladder, but also ensures the safety of maintenance personnel when entering and exiting the pit. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the pit ladder provided by an embodiment of this application in the use state.

[0033] Figure 2 For Figure 1 The enlarged view of part A in

[0034] Figure 3 It is a schematic structural diagram of the pit ladder provided by an embodiment of this application.

[0035] Figure 4 For Figure 1 The enlarged view of part B in

[0036] Figure 5 For Figure 1 The enlarged view of part C in

[0037] Figure 6 For Figure 1 The enlarged view of part D in

[0038] Figure 7 It is a schematic structural diagram of the locking buckle plate in this application.

[0039] Reference numerals: 100, pit ladder; 10, ladder main body; 101, upper end; 11, ladder pipe; 111, support surface; 12, tread bar; 20, pulling assembly; 21, pulling rope; 211, chain; 22, eye bolt; 30, lock plate; 31, connecting main board; 32, limit baffle; 321, first plate body; 322, second plate body; 33, connecting bolt; 40, locking member; 50, trigger switch; 51, travel switch; 200, pit; 201, pit floor; 300, landing sill; 301, door chute. Detailed implementation mode

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that when an element is referred to as being "provided on" another element, it can be directly provided on the other element or there may also be an intermediate element. When an element is considered to be "provided on" another element, it can be directly provided on the other element or there may be an intermediate element at the same time. When an element is considered to be "fixed to" another element, it can be directly fixed to the other element or there may be an intermediate element at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] The pit ladder 100 claimed in this application is applied to an elevator and is specifically placed in the pit 200, enabling maintenance personnel to enter and exit the pit 200 through the pit ladder 100.

[0044] Such as Figures 1 to 3As shown, a pit ladder 100 provided in an embodiment of the present application includes a ladder body 10, a pulling assembly 20 and a locking plate 30. The ladder body 10 has a first state and a second state. In the first state, the ladder body 10 lies flat on the pit floor 201, and in the second state, the ladder body 10 leans against the hall door sill 300; the pulling assembly 20 is transmission-connected to the ladder body 10, and the pulling assembly 20 can lift the ladder body 10, so as to control the ladder body 10 to switch between the first state and the second state; the locking plate 30 is movably mounted on the ladder body 10, and the locking plate 30 can cooperate with the hall door sill 300, so as to control the locking / unlocking of the ladder body 10 in the first state on the hall door sill 300.

[0045] It can be understood that when the elevator using the pit ladder 100 is in operation, the pit ladder 100 can lie flat on the pit floor 201, so that the presence of the pit ladder 100 will not occupy the vertical space of the shaft, and the elevator car and the shaft wall can be closer together without being affected by the pit ladder 100, so that the pit ladder 100 can be suitable for working conditions with extremely compact shaft plan layout; when the pulling component 20 switches the ladder body 10 to lean against the hall door sill 300, the locking plate 30 can be used to lock the leaning ladder body 10 on the hall door sill 300, so as to prevent maintenance personnel from falling off when climbing the ladder body 10. In this way, it is not only convenient for maintenance personnel to enter and exit the pit through the pit ladder 100, but also the safety of maintenance personnel when entering and exiting the pit 200 is ensured. It should be noted that, since the maintenance personnel enter and exit the pit 200 by climbing the inclined ladder body 10, it is more convenient for the maintenance personnel to climb compared to the existing vertical pit ladder.

[0046] like Figures 3 to 5 As shown, the ladder body 10 includes two ladder tubes 11 and a plurality of rungs 12, wherein the plurality of rungs 12 are arranged in sequence and spaced apart along the length direction of the ladder tubes 11 between the two ladder tubes 11 and are respectively connected to the two ladder tubes 11; the ladder tube 11 has a supporting surface 111, and the supporting surface 111 is configured as an inclined structure. When the ladder body 10 is in the second state, the ladder tube 11 can be abutted against the pit floor 201 through the supporting surface 111, so that the ladder tube 11 on the ladder body 10 in the second state can be in surface contact with the pit floor 201, so as to increase the contact area between the ladder body 10 and the pit floor 201 when it is inclined against the hall door sill 300, thereby increasing the friction between the ladder tube 11 and the pit floor 201, so as to better prevent the pit ladder 100 from slipping and moving during use. Here, the ladder pipe 11 and the rungs 12 are both configured as metal pipes, and further configured as hollow pipes, and a plurality of rungs 12 are respectively connected to the two ladder pipes 11 in a welding manner.

[0047] As Figure 3 、 Figure 6 shown, the pulling assembly 20 includes a pulling rope 21. One end of the pulling rope 21 is fixed to the upper end portion 101 of the ladder main body 10. When the ladder main body 10 is in the second state, the upper end portion 101 of the ladder main body 10 is disposed above the landing sill 300 of the landing door; the other end of the pulling rope 21 is fixed to a wall surface (not shown in the figure) for maintenance personnel to grasp. By pulling the pulling rope 21, the maintenance personnel can drive the ladder main body 10 to switch between the first state and the second state, which facilitates the maintenance personnel to control the ladder main body. Here, one end of the pulling rope 21 can be fixed to the wall surface by an expansion bolt, so that the maintenance personnel standing on the landing sill 300 can reach the pulling rope 21 by stretching out their hands, facilitating the maintenance personnel to grasp the pulling rope 21. It should be noted that when the pulling rope 21 is fixed to the upper end portion 101 of the ladder main body 10, when the maintenance personnel pull the pulling rope 21, the support surface 111 on the ladder pipe 11 can be driven to touch the ground.

[0048] Preferably, as Figure 6 shown, the pulling rope 21 is configured as a chain 211. One end of the chain 211 is fixed to the ladder main body 10 through a lifting eye bolt 22. Specifically, the lifting eye bolt 22 can be disposed on the upper end portion 101 of the ladder pipe 11. By utilizing the structural characteristics of the chain 211, the pulling rope 21 has the characteristics of being firm and moisture-resistant, meeting the usage requirements for being applied in the pit 200. Of course, in other embodiments, the pulling rope can also adopt flexible structural materials, such as nylon ropes, steel wires, etc.

[0049] As Figure 2 、 Figure 5 and Figure 7 shown, the lock plate 30 includes a connecting main board 31 and a limiting baffle 32. The connecting main board 31 is rotatably mounted on the ladder main body 10 and is connected to the limiting baffle 32. Moreover, the limiting baffle 32 can be inserted into the door body chute 301 of the landing sill 300 under the drive of the connecting main board 31 to lock the ladder main body 10. That is to say, the lock plate 30 can rotate on the ladder main body 10 and control the engagement between the limiting baffle 32 and the door body chute 301 on the landing sill 300 to realize the control of locking the ladder main body 10 leaning against the landing sill 300 by the lock plate 30, which facilitates the maintenance personnel to operate and control the lock plate 30. Here, the connecting main board 31 is rotatably mounted on the ladder main body 10 through a connecting bolt 33. The limiting baffle 32 is disposed at one end portion of the connecting main board 31 and is integrally connected to the connecting main board 31. Specifically, the lock plate 30 can be configured as a metal plate.

[0050] Preferably, as shown in the figure, the limit baffle 32 includes a first plate 321 and a second plate 322, the first plate 321 is vertically connected to the connecting main board 31; the second plate 322 is arranged on the outer side of the connecting main board 31 and connected to the first plate 321, and is used for plugging and matching with the door body slide groove 301. Here, the connecting main board 31 and the limit baffle 32 are configured as an integrated structure, so that the first plate 321 and the second plate 322 on the limit baffle 32 can be prepared by bending. It should be noted that the number of the second plate 322 in this embodiment is two, and the two second plate 322 are symmetrically arranged on both sides of the first plate 321, and an angle is formed between the second plate 322 and the first plate 321.

[0051] like Figure 2 , Figure 5 As shown, a locking member 40 is detachably connected to the ladder body 10, and the locking member 40 can pass through the locking plate 30 and be connected to the ladder body 10, and is used to limit the locking plate 30 to the ladder body 10, so that the locking plate 30 is separated from the hall door sill 300, and the lock of the ladder body 10 on the hall door sill 300 is released. In other words, the maintenance personnel can limit the locking plate 30 to the ladder body 10 with the locking member 40, which can create conditions for the subsequent use of the locking plate 30. Here, the locking member 40 is configured as a bolt, a screw, or a latch. In one embodiment, the locking member 40 can be connected to the ladder tube 11 of the ladder body 10 in a threaded manner. It should be noted that the maintenance personnel located on the hall door sill 300 can directly twist the locking piece 40 by hand. When the locking piece 40 is removed from the ladder body 10, since the ladder body 10 is leaning against the hall door sill 300, the lock plate 30 can fall from the ladder body 10 under the action of gravity and be inserted into the door body slide groove 301 on the hall door sill 300. In this way, when the lock plate 30 is not manually moved, the upper limit baffle 32 on the lock plate 30 cannot be detached from the door body slide groove 301 on the hall door sill 300.

[0052] As preferably, Figure 2 , Figure 3 and Figure 5As shown, a trigger switch 50 is provided on the ladder body 10. When the lock plate 30 locks the ladder body 10 in the second state on the hall door sill 300, the trigger switch 50 can be triggered by the lock plate 30 and generate a feedback signal; and the feedback signal is used to control the elevator to stop. This ensures the personal safety of maintenance personnel when entering the pit 200. Here, the trigger switch 50 is configured as a travel switch 51, and the contacts on the travel switch 51 can form a matching relationship with the first plate body 321 on the lock plate 30. When the lock plate 30 leaves the original position, the travel switch 51 is disconnected, causing the elevator safety circuit to be disconnected, so that the elevator cannot run. Of course, in other embodiments, the trigger switch 50 can also be configured as a photoelectric switch, a micro switch, etc., which will not be elaborated here.

[0053] It should be noted that when the pit ladder 100 of the present application is not in use, the lock plate 30 is fixed to the ladder body 10 by the locking member 40, so that the limit baffle 32 on the lock plate 30 bears against the contact on the travel switch 51, the travel switch 51 is in the energized state, the elevator safety circuit is turned on, and the normal operation of the elevator is ensured. When the maintenance personnel remove the locking member 40, the lock plate 30 can make a circular motion relative to the ladder body 10 through the connecting bolt 33 under the action of gravity. In this process, when the limit baffle 32 on the lock plate 30 is separated from the contact of the travel switch 51, the contact on the travel switch 51 pops out, and the elevator safety circuit is disconnected.

[0054] In summary, the pit ladder 100 of the present application can lie flat on the pit floor 201 when not in use. When the locking plate 30 is locked to the ladder body by the locking member 40, the travel switch 51 is in the power-on state, and the elevator moves normally. When the pit ladder 100 needs to be used, the maintenance personnel need to lift the ladder body 10 through the pulling assembly 20. When the ladder body 10 is leaning on the hall door sill 300, the maintenance personnel remove the locking member 40 on the locking plate 30 so that the locking plate 30 can be rotated to the door body slide groove 301 of the hall door sill 300. Due to the influence of gravity, once the locking plate 30 is against the door body slide groove 301 of the hall door sill 300, the locking plate 30 cannot be separated from the door body slide groove 301 of the hall door sill 300 without human manipulation. At this time, the pit ladder 100 is fixed, and because the locking plate 30 leaves the original position, the travel switch 51 is disconnected, causing the elevator safety circuit to be disconnected, and the elevator cannot operate. When the pit ladder 100 is finished and needs to be retracted, the locking plate 30 is first rotated, and the locking member 40 is used to fix the locking plate 30 to the ladder body 10, so that the locking plate 30 can push the contact of the travel switch 51 back to the passage state, and the safety circuit is energized. At this time, because the locking plate 30 is free from the restraint of the door body slide 301 on the hall door sill 300, the ladder body 10 can move, and finally the ladder body 10 can be placed in the original lying position through the pulling assembly 20.

[0055] In addition, the present application also provides an elevator, including the pit ladder 100 described above.

[0056] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0057] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. As long as it is within the scope of the substantial spirit of the present utility model, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present utility model.

Claims

1. A pit ladder, characterized in that: The pit ladder (100) comprises: A ladder body (10) has a first state and a second state. In the first state, the ladder body (10) lies flat on the pit floor (201). In the second state, the ladder body (10) leans against the hall door sill (300). A pulling assembly (20) is transmission-connected to the ladder body (10), and the pulling assembly (20) is capable of pulling the ladder body (10) to control the ladder body (10) to switch between the first state and the second state; A locking plate (30) is movably mounted on the ladder body (10), and the locking plate (30) can cooperate with the hall door sill (300) to control the locking / unlocking of the ladder body (10) on the hall door sill (300) in the first state.

2. The pit ladder according to claim 1, characterized in that: The locking plate (30) comprises a connecting main plate (31) and a limiting baffle (32); the connecting main plate (31) is rotatably mounted on the ladder body (10) and connected to the limiting baffle (32); and the limiting baffle (32) can be inserted into a door body slide groove (301) of the hall door sill (300) under the drive of the connecting main plate (31) to lock the ladder body (10).

3. The pit ladder according to claim 2, characterized in that: The limit baffle (32) comprises a first plate body (321) and a second plate body (322); the first plate body (321) is vertically connected to the connecting main plate (31) and is used to trigger a trigger switch (50) mounted on the ladder body (10); The second plate body (322) is arranged on the outer side of the connecting main plate (31) and is connected to the first plate body (321), and is used for plugging and cooperating with the door body sliding groove (301).

4. The pit ladder according to claim 1, characterized in that: A locking piece (40) is detachably connected to the ladder body (10); the locking piece (40) can pass through the locking plate (30) and be connected to the ladder body (10), and is used to limit the locking plate (30) to the ladder body (10), so that the locking plate (30) is separated from the hall door sill (300), and the ladder body (10) is unlocked from the hall door sill (300).

5. The pit ladder according to claim 1, characterized in that: The ladder body (10) is provided with a trigger switch (50), and when the locking plate (30) locks the ladder body (10) in the second state on the hall door sill (300), the trigger switch (50) can be triggered by the locking plate (30) and generate a feedback signal; The feedback signal is used to control the elevator to stop.

6. The pit ladder according to claim 5, characterized in that: The trigger switch (50) is configured as a travel switch (51).

7. The pit ladder according to claim 1, characterized in that: The ladder body (10) comprises two ladder tubes (11) and a plurality of rungs (12), wherein the plurality of rungs (12) are sequentially arranged between the two ladder tubes (11) at intervals along the length direction of the ladder tubes (11) and are respectively connected to the two ladder tubes (11); The ladder tube (11) has a support surface (111), and the support surface (111) is configured as an inclined surface structure; when the ladder body (10) is in the second state, the ladder tube (11) can be attached to the pit floor (201) through the support surface (111).

8. The pit ladder according to claim 1, characterized in that: The pulling assembly (20) comprises a pulling rope (21), one end of the pulling rope (21) is fixed to the upper end (101) of the ladder body (10), and the other end of the pulling rope (21) is fixed to the wall surface for maintenance personnel to grab; Wherein, when the ladder body (10) is in the second state, the upper end portion (101) of the ladder body (10) is arranged above the hall door sill (300).

9. The pit ladder according to claim 8, characterized in that: The pulling rope (21) is configured as a chain (211), and one end of the chain (211) is fixed to the ladder body (10) via a lifting eye screw (22).

10. An elevator, characterized in that: It comprises the pit ladder (100) as described in any one of claims 1 to 9.

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