Door opening retaining device for elevator door motor and elevator device

Abstract

The utility model discloses a door opening retaining device for an elevator door motor and an elevator device, and relates to the technical field of vertical elevators. The door opening maintaining device comprises a limiting assembly connected to the door machine main plate, the limiting assembly comprises a limiting guide rail extending in the horizontal direction, the limiting guide rail is provided with a horizontal part and a protrusion protruding in the vertical direction, the horizontal part is arranged at the end, away from the door machine hanging plate, of the protrusion, and the door ball assembly is connected to the door machine hanging plate. The door ball assembly is arranged in the mode that a door ball of the door ball assembly moves to the horizontal part through the protrusion so that an elevator can be in an open state, and the elastic assembly is arranged in the mode that the door ball is in a deformation state when passing through the protrusion and recovers to the initial state when passing through the protrusion to the horizontal part. The driving mechanism is arranged to drive the door machine hanging plate to move in the horizontal direction so as to drive the door ball assembly to pass through the protrusion of the limiting guide rail of the limiting assembly. The door opening retaining device can ensure that the elevator door is always in an open state after the elevator loses power.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vertical elevator technical field, concretely relates to a kind of door opening keeping device for elevator door machine and elevator device. BACKGROUND

[0002] At present, vertical elevator is generally used in high-rise building for up and down floor traffic, with the advantages of small floor area and low cost. The elevator in public places needs to meet the fire acceptance requirements, that is, when FAS (Fire Alarm System) sends fire instructions to the elevator, the elevator realizes fire forced landing. After the elevator completes the fire forced landing action, it returns a signal to FAS and keeps the car door and landing door open after FAS cuts off the power supply of the elevator.

[0003] However, in the prior art, after the elevator fire forced landing, the elevator loses power and the door motor stops working. Due to the action of the hall door weight or spring, the car door and landing door will slowly close. Even if an emergency power supply is installed, the emergency power supply will only intervene after the elevator loses power, and there will be a short delay. At this time, the door leaf is basically in a closed state or even closed. After the emergency power supply is powered on, the door machine slowly opens the door leaf. The process of closing and opening after power failure after fire forced landing does not meet the elevator fire acceptance requirements. SUMMARY

[0004] One object of the first aspect of the utility model is to provide a door opening keeping device for elevator door machine, which solves the technical problem that the elevator door is always closed and cannot meet the fire requirements due to the closing force of the landing door weight or spring after the door machine loses power in the prior art.

[0005] Another object of the first aspect of the utility model is to improve the structural stability of the door opening keeping device.

[0006] The object of the second aspect of the utility model is to provide an elevator device comprising the above door machine keeping device.

[0007] According to the object of the first aspect of the utility model, the utility model provides a door opening keeping device for elevator door machine, comprising:

[0008] A limiting component is connected to the door machine main plate, the limiting component comprises a limiting guide rail extending in the horizontal direction, the limiting guide rail has a horizontal part and a protrusion protruding in the vertical direction, and the horizontal part is arranged at one end of the protrusion away from the door machine hanging plate;

[0009] A door ball component is connected to the door machine hanging plate, the door ball component is arranged such that the door ball moves to the horizontal part through the protrusion to make the elevator in an open door state, and the door machine hanging plate is movably connected to the door machine main plate;

[0010] a resilient component arranged to be in a deformed state when the ball passes the protrusion, and to return to an initial state when the ball passes the protrusion to the horizontal part;

[0011] a driving mechanism arranged on the door machine main plate and configured to drive the door machine hanging plate to move along the horizontal direction, so as to drive the ball component to pass the protrusion of the limiting guide rail of the limiting component.

[0012] Optionally, the resilient component is arranged at an end of the ball component away from the ball, and the ball component further comprises:

[0013] a connecting piece having the ball mounted at one end and arranged to be connected with an end of the resilient component, so that the connecting piece is forced to drive the resilient component to be in a tensile state when the ball passes the protrusion.

[0014] Optionally, the protrusion has an arc structure, and the arc structure is arranged to protrude upward along the vertical direction.

[0015] Optionally, the arc of the arc structure is arranged according to the power of the driving mechanism.

[0016] Optionally, the protrusion has a V-shaped structure.

[0017] Optionally, the protrusion is arranged at an end of the horizontal part close to the door machine main plate, and the limiting component further comprises:

[0018] a vertical part extending along the vertical direction, and the vertical part is arranged at an end of the horizontal part away from the protrusion.

[0019] Optionally, the resilient component comprises:

[0020] a guide piece arranged at one end to be fixed;

[0021] a resilient piece sleeved on the periphery of the guide piece, and an end of the resilient piece away from the fixed end of the guide column is connected with an end of the connecting piece.

[0022] Optionally, the resilient component is arranged at an end of the limiting guide rail away from the door machine hanging plate.

[0023] According to the second aspect of the present application, the present application further provides an elevator device comprising at least one door opening and keeping device according to any one of the above, and the elevator device further comprises:

[0024] at least one elevator door extending along the vertical direction;

[0025] At least one door machine hanging plate corresponding to the elevator door is arranged above the elevator door, and the door machine hanging plate is fixedly connected with the elevator door;

[0026] A door machine main plate is connected with the door machine hanging plate through a driving mechanism, so that the driving mechanism drives the door machine hanging plate to move and drives the elevator door to switch between the open state and the closed state.

[0027] The utility model discloses a door machine main plate is arranged on the door machine main plate and sets up the door ball subassembly on the door machine hanging plate to set up the limiting guide rail of limiting component into having horizontal part and the structure of protruding, and the horizontal part sets up at the one end of protruding away from the door machine hanging plate, and the force that the driving mechanism output is far greater than the force that the door ball crosses the protruding of limiting guide rail when opening the elevator door and causes the deformation of elastic component, namely, after the power failure of the door machine, the driving mechanism cannot be powered, and the door closing force of floor door weight cannot drive the door ball to pass through the protruding from the horizontal part, thereby limiting the door ball in the horizontal part when the power failure of the driving mechanism makes the elevator door be in the open state, thereby satisfying the elevator fire fighting requirement.

[0028] Further, the protruding is arranged at one end of the horizontal part close to the door machine main plate, the limiting component further includes a vertical part, the vertical part extends in a vertical direction, and the vertical part is arranged at one end of the horizontal part away from the protruding, that is, the vertical part is arranged perpendicular to the horizontal part and at one end of the horizontal part away from the protruding, so as to limit the door ball after passing through the protruding to prevent the door ball from sliding and causing structural damage, thereby improving the structural stability of the door opening maintaining device.

[0029] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] Some specific embodiments of the utility model will be described in detail below with reference to the drawings in an exemplary but not restrictive manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0031] Figure 1 is a schematic structural view of the door opening maintaining device in a closed state according to an embodiment of the utility model;

[0032] Figure 2 is Figure 1 is a schematic partial enlarged view of position A shown in the figure;

[0033] Figure 3is a schematic structural view of the door opening keeping device in the open state according to an embodiment of the present application;

[0034] Figure 4 is Figure 3 is a schematic partial enlarged view at B shown in the figure;

[0035] Figure 5 is a schematic structural view of the door opening keeping device in the closed state according to another embodiment of the present application;

[0036] Figure 6 is Figure 5 is a schematic partial enlarged view at C shown in the figure;

[0037] Figure 7 is a schematic structural view of the door opening keeping device in the open state according to another embodiment of the present application;

[0038] Figure 8 is Figure 7 is a schematic partial enlarged view at D shown in the figure.

[0039] Reference signs:

[0040] 100 - door opening keeping device, 10 - limiting assembly, 11 - limiting guide rail, 111 - horizontal part, 112 - protrusion, 113 - vertical part, 20 - door ball assembly, 21 - door ball, 22 - connecting piece, 23 - fixed shaft, 30 - elastic assembly, 31 - guide piece, 32 - elastic piece, 200 - elevator device, 220 - door machine hanging plate, 210 - door machine main plate. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0043] The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a list of steps or units is not necessarily limited to the listed steps or units, but can optionally further include additional steps or units not listed, or can optionally further include other steps or units inherent to such process, method, product, or apparatus.

[0044] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from among a great variety of embodiments that can be made.

[0045] The elevator of the application is a straight elevator, which is usually arranged in a hoistway and comprises a car and a door machine located on the top of the car, the door machine comprising a door machine main plate, a driving mechanism and a door machine hanging plate, the door machine main plate and the door machine hanging plate being arranged on the top of the elevator door, the door machine hanging plate being connected with the elevator door, and the door machine main plate being provided with a sliding groove arranged parallel to the horizontal movement direction of the elevator door, the door machine hanging plate being provided with a pulley, the pulley of the door machine hanging plate being driven to move along the extension direction of the sliding groove by the driving mechanism to drive the elevator door to move in the horizontal direction, i.e. to open or close the elevator door.

[0046] Figure 1 is a schematic structural view of the door opening maintaining device according to an embodiment of the utility model in a closed state, Figure 2 is Figure 1 a schematic partial enlarged view of A shown in Figure 3 is a schematic structural view of the door opening maintaining device according to an embodiment of the utility model in an open state, Figure 4 is Figure 3 a schematic partial enlarged view of B shown in Figure 5 is a schematic structural view of the door opening maintaining device according to another embodiment of the utility model in a closed state, Figure 6 is Figure 5 a schematic partial enlarged view of C shown in Figure 7 is a schematic structural view of the door opening maintaining device according to another embodiment of the utility model in an open state, Figure 8 is Figure 7 a schematic partial enlarged view of D shown in

[0047] As Figure 1 shown, the utility model provides a kind of door opening maintaining device 100 for elevator door machine. Door opening maintaining device 100 includes limiting component 10, door ball component 20, elastic component 30 (refer to Figure 2) and a driving mechanism (not shown in the figure), the limiting assembly 10 is connected to the door machine main plate 210, the limiting assembly 10 comprises a limiting guide rail 11 extending in the horizontal direction, the limiting guide rail 11 has a horizontal part 111 and a protrusion 112 protruding in the vertical direction, and the horizontal part 111 is arranged at one end of the protrusion 112 away from the door machine hanging plate 220, the door ball assembly 20 is connected to the door machine hanging plate 220, the door ball assembly 20 is arranged such that the door ball 21 moves to the horizontal part 111 through the protrusion 112 so that the elevator is in the open door state, the door machine hanging plate 220 is movably connected to the door machine main plate 210, the elastic assembly 30 is arranged such that the door ball 21 is in the deformed state when passing through the protrusion 112, and the door ball 21 returns to the initial state when passing through the protrusion 112 to the horizontal part 111, the driving mechanism is located on the door machine main plate 210, and the driving mechanism is arranged to drive the door machine hanging plate 220 to move in the horizontal direction, so as to drive the door ball assembly 20 to pass through the protrusion 112 of the limiting guide rail 11 of the limiting assembly 10.

[0048] In the embodiment, by arranging the limiting assembly 10 on the door machine main plate 210 and the door ball assembly 20 on the door machine hanging plate 220, and arranging the limiting guide rail 11 of the limiting assembly 10 to have the structure of the horizontal part 111 and the protrusion 112, and the horizontal part 111 is arranged at one end of the protrusion 112 away from the door machine hanging plate 220, in the process of driving the driving mechanism to drive the door machine hanging plate 220 to move towards the side edge of the door machine main plate 210, the door ball 21 in the door ball assembly 20 moves along the upper surface of the limiting guide rail 11 towards the end close to the horizontal part 111, until the door ball 21 passes through the protrusion 112 of the limiting guide rail 11 to reach the horizontal part 111, so that the elevator door is in the open state, that is, the force output by the driving mechanism when opening the elevator door is much larger than the force required for the elastic assembly 30 to deform when the door ball 21 passes over the protrusion 112 of the limiting guide rail 11, that is, after the door machine loses power, the driving mechanism cannot be powered, and the closing force generated by the layer door weight cannot drive the door ball 21 to pass through the protrusion 112 from the horizontal part 111, thereby limiting the door ball 21 in the horizontal part 111 when the driving mechanism loses power, so that the elevator door is in the open state, thereby meeting the elevator fire safety requirements.

[0049] As shown in Figure 1 , in the embodiment, the door opening and maintaining device 100 is in the closed door state, that is, the door ball assembly 20 and the limiting assembly 10 of the door opening and maintaining device 100 are separated, the door opening and maintaining device 100 is in the open door state, that is, the door ball 21 in the door ball assembly 20 of the door opening and maintaining device 100 is located in the horizontal part 111 of the limiting guide rail 11 of the limiting assembly 10 (refer to Figure 3 and Figure 4 ).

[0050] As shown in Figure 2As shown, in a further embodiment, the elastic assembly 30 is arranged at the end of the door ball assembly 20 away from the door ball 21, and the door ball assembly 20 further comprises a connecting piece 22, one end of the connecting piece 22 is provided with the door ball 21, and the other end is arranged in connection with the end of the elastic assembly 30, so that when the door ball 21 passes through the protrusion 112, the connecting piece 22 is forced to drive the elastic assembly 30 to be in a stretched state, that is, the elastic assembly 30 is connected to the door ball 21 through the connecting piece 22, and during the movement of the door ball 21 in the door ball assembly 20 to contact the limiting guide rail 11 until the door ball 21 moves to the highest point of the protrusion 112, the door ball 21 is always subjected to an upward force perpendicular to the surface of the limiting guide rail 11. Due to the principle of leverage, the elastic assembly 30 at the end of the door ball assembly 20 is in a stretched state under stress, and during the movement of the door ball 21 through the highest point of the protrusion 112 to the horizontal part 111 of the limiting guide rail 11, the elastic assembly 30 gradually recovers from deformation to the initial state. That is, in this embodiment, when the elevator door is closed, the closing force generated by the door weight cannot overcome the force of the elastic assembly 30 deforming, that is, the closing force of the door weight cannot make the door ball 21 pass through the protrusion 112 from the horizontal part 111, thereby further improving the safety of the elevator door always being in an open state when the driving mechanism loses power.

[0051] In a further embodiment, the protrusion 112 has an arc-shaped structure, and the arc-shaped structure is arranged to protrude upward in the vertical direction. In this embodiment, the arc-shaped protrusion 112 of the door ball assembly 20 increases the motor power of the driving mechanism for driving the elevator door to open, that is, the force generated by the motor power of the driving mechanism needs to overcome the force of the door weight or spring and the elastic force generated by the deformation of the elastic assembly 30 when the door ball 21 passes through the arc-shaped structure to open the elevator door. After the driving mechanism loses power, the gravity generated by the door weight cannot overcome the elastic force generated by the elastic assembly 30 when the door ball 21 passes through the protrusion 112 from the horizontal part 111, so that the door ball 21 is limited in the horizontal part 111, that is, the elevator door in the open state always remains in the open state after the driving mechanism loses power, so as to meet the elevator fire safety requirements.

[0052] In a further embodiment, the curvature of the arc-shaped structure is set according to the power of the driving mechanism and the closing force of the elevator door, that is, the motor power of the driving mechanism of different elevators is different, the greater the motor power, the greater the gravity that can be overcome by the layer door weight hammer, the elastic force that the door ball 21 needs to overcome through the protrusion 112 generated by the elastic assembly 30, that is, the greater the curvature of the protrusion 112, the greater the deformation of the elastic assembly 30 of the door ball 21 through the protrusion 112, and the greater the elastic force generated by the elastic assembly 30 to overcome the deformation. That is, in this embodiment, the greater the motor power of the driving mechanism, the greater the curvature of the protrusion 112 needs to be to ensure that the driving mechanism does not affect the driving of the elevator door to open, and the elastic force of the elastic assembly 30 of the protrusion 112 is always greater than the closing force to ensure that the elevator door in the open state is in the open state after the door machine loses power.

[0053] In a further embodiment, the protrusion 112 is in a V-shaped structure, that is, the V-shaped protrusion 112 can also provide a certain limiting effect to the passing of the door ball assembly 20, and because the top of the V-shaped structure is in a tapered structure, it will make the door ball 21 overcome greater elastic force generated by the elastic assembly 30 when passing through the V-shaped protrusion 112 from the horizontal part 111, thereby more stably limiting the door ball 21 in the horizontal part 111.

[0054] As shown in Figure 4 In a further embodiment, the protrusion 112 is arranged at one end of the horizontal part 111 close to the main board 210 of the door machine, and the limiting assembly 10 further includes a vertical part 113, which extends in the vertical direction, and the vertical part 113 is arranged at the other end of the horizontal part 111 away from the protrusion 112, that is, the vertical part 113 is arranged perpendicular to the horizontal part 111 and located at the other end of the horizontal part 111 away from the protrusion 112, so as to limit the door ball 21 after passing through the protrusion 112 to cause the horizontal part 111, prevent the door ball 21 from sliding down to cause structural damage, thereby improving the structural stability of the door opening and keeping device 100.

[0055] As shown in Figure 2As shown, in a further embodiment, the elastic component 30 includes a guide 31 and an elastic element 32. One end of the guide 31 is fixedly disposed, and the elastic element 32 is sleeved on the periphery of the guide 31. The end of the elastic element 32 away from the fixed end of the guide is connected to the end of the connector 22. In this embodiment, the guide 31 has a columnar structure and one end is fixedly disposed. The elastic element 32 is disposed on the periphery of the guide 31 so that during the movement of the ball 21 toward the highest point of the protrusion 112, the connector 22 is subjected to force and rotates around the fixed axis 23 to drive the elastic element 32 to extend along the extension direction of the guide 31, causing the elastic element 32 to undergo elastic deformation. After the ball 21 passes the highest point of the protrusion 112, it recovers its deformation to limit the ball 21 to the horizontal part 111. Here, the elastic element 32 has an initial state of being sleeved on a portion of the length of the guide 31 and a stretched state of being sleeved on the guide 31. The guide 31 can also be other structures, and the structure of the guide 31 is not specifically limited here.

[0056] like Figure 6 As shown, in another embodiment, the elastic component 30 is disposed at the end of the limiting guide rail 11 away from the door operator hanging plate 220. That is, the elastic component 30 in this embodiment is configured to be connected to the limiting guide rail 11, and the protrusion 112 of the limiting guide rail 11 in this embodiment is configured to protrude downward in the vertical direction. In other words, in this embodiment, when the door ball 21 of the door ball assembly 20 moves toward the limiting guide rail 11 and abuts against the limiting guide rail 11 until it passes through the protrusion 112, the limiting guide rail 11 applies a downward force perpendicular to the limiting guide rail 11 to the door ball 21. Due to the lever principle, the end of the limiting guide rail 11 connected to the elastic component 30 applies an upward force perpendicular to the limiting guide rail 11 to the elastic component 30, so that the elastic element 32 in the elastic component 30 is compressed and deformed. The compressive force on the elastic element 32 is the greatest when the door ball 21 is at the lowest point of the protrusion 112, and the door ball 21 recovers its deformation after passing through the lowest point of the protrusion 112. This moves the door machine mounting plate 220 to a position that can overcome the closing force generated by the landing door counterweight or spring, preventing the elevator door from being in a normally closed state or a state of closing first and then closing when the door machine loses power, thereby meeting fire protection requirements.

[0057] like Figure 5 As shown, in this embodiment, the door opening retaining device 100 is in the closed state, that is, the door ball assembly 20 and the limiting assembly 10 of the door opening retaining device 100 are separated. The door opening retaining device 100 is in the open state, that is, the door ball 21 in the door ball assembly 20 of the door opening retaining device 100 is located at the horizontal part 111 of the limiting guide rail 11 of the limiting assembly 10 (see reference). Figure 7 and Figure 8 ).

[0058] The utility model also provides a kind of elevator device 200, including above at least one door opening keeping device 100.

[0059] In the embodiment, the elevator device 200 further includes at least one elevator door, at least one door machine hanging plate 220 and a door machine main plate 210 corresponding to the elevator door, each elevator door is arranged to extend in the vertical direction, the door machine hanging plate 220 is located above the elevator door, and the door machine hanging plate 220 is fixedly connected with the elevator door, the door machine main plate 210 is connected with the door machine hanging plate 220 through a driving mechanism, so that the driving mechanism drives the door machine hanging plate 220 to move, and the elevator door is switched between the open state and the closed state, and when the door machine of the elevator device 200 loses power, i.e. the driving mechanism is powered off, the protrusion 112 of the limiting guide rail 11 can overcome the self-closing force generated by the landing door and the elevator door, i.e. the door leaf is always kept in the open state after the door machine loses power, which meets the fire acceptance requirements.

[0060] In the embodiment, when the number of elevator doors of the elevator device 200 is one, the number of door opening keeping devices 100 is one, i.e. the limiting assembly 10 of the door opening keeping device 100 is arranged at the side edge of the door machine main plate 210 or the position close to the side edge of the door machine main plate 210, and the door ball assembly 20 of the door opening keeping device 100 is arranged on the door machine hanging plate 220, so that when the driving mechanism drives the door machine hanging plate 220 to move along the door machine main plate 210, the door ball assembly 20 is driven to move towards the position of the limiting assembly 10, until the door ball 21 in the door ball assembly 20 moves to the horizontal part 111 through the protrusion 112 of the limiting guide rail 11, so that the elevator door can overcome the self-closing force generated by the landing door weight or spring. Here, the limiting assembly 10 is arranged on the door machine main plate 210, which can improve the space utilization and avoid the problem that when the volume of the door machine main plate 210 is too large, the limiting assembly 10 protrudes and is arranged at the side edge of the door machine main plate 210, resulting in that the door opening keeping device 100 occupies too much space.

[0061] In the embodiment, when the number of elevator doors of the elevator device 200 is two, the number of door opening keeping devices 100 can be one or two. When the number of door opening keeping devices 100 is one, the limiting assembly 10 and the door ball assembly 20 of the door opening keeping device 100 can be arranged on any one of the two elevator doors at the same time, which can ensure that at least one elevator door is in the open state when the door machine loses power. When the number of door opening keeping devices 100 is two, one door opening keeping device 100 is arranged corresponding to each elevator door, i.e. each elevator door is provided with a limiting assembly 10 and a door ball assembly 20, so as to overcome the closing force generated by the landing door weight or spring, so that the two elevator doors and the landing door are always in the open state.

[0062] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered as the scope of the description.

[0063] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, under the premise of not departing from the utility model concept, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An opening door holding device for an elevator door operator, characterized in that, The application relates to an open-door keeping device. The open-door keeping device comprises a limiting assembly connected to a door machine main plate, the limiting assembly comprises a limiting guide rail extending in a horizontal direction, the limiting guide rail has a horizontal part and a protrusion extending in a vertical direction, and the horizontal part is arranged at one end of the protrusion away from the door machine main plate; a door ball assembly connected to a door machine hanging plate, the door ball assembly is arranged so that the door ball moves to the horizontal part through the protrusion to make the elevator in an open-door state, the door machine hanging plate is movably connected to the door machine main plate; an elastic assembly arranged so that the door ball is in a deformed state when passing through the protrusion, and the door ball returns to an initial state when passing through the protrusion to the horizontal part; and a driving mechanism arranged on the door machine main plate and arranged to drive the door machine hanging plate to move in the horizontal direction, so as to drive the door ball assembly to pass through the protrusion of the limiting guide rail of the limiting assembly. The elastic assembly is arranged at one end of the door ball assembly away from the door ball, and the door ball assembly further comprises a connecting piece having the door ball mounted at one end and arranged to be connected to an end of the elastic assembly, so that the connecting piece drives the elastic assembly to be in a tensile state when the door ball passes through the protrusion.

3. The open-door keeping device according to claim 2, wherein the protrusion is in an arc structure arranged to extend upward in the vertical direction.

4. The open-door keeping device according to claim 3, wherein the arc of the arc structure is arranged according to the power of the driving mechanism.

2. The door holding open device of claim 1, wherein 5. The open-door keeping device according to claim 2, wherein the protrusion is in a V-shaped structure.

6. The open-door keeping device according to claim 5, wherein the protrusion is arranged at one end of the horizontal part close to the door machine main plate, and the limiting assembly further comprises a vertical part extending in the vertical direction and arranged at one end of the horizontal part away from the protrusion. The elastic assembly comprises a guide piece fixedly arranged at one end, and an elastic piece sleeved on the periphery of the guide piece and connected to the end of the connecting piece at one end away from the fixed end of the guide piece.

8. The open-door keeping device according to claim 1, wherein the elastic assembly is arranged at one end of the limiting guide rail away from the door machine hanging plate. The elevator device comprises at least one open-door keeping device according to any one of claims 1-8, and further comprises at least one elevator door extending in the vertical direction; at least one door machine hanging plate arranged in one-to-one correspondence with the elevator door and located above the elevator door, and the door machine hanging plate is fixedly connected to the elevator door; and a door machine main plate connected to the door machine hanging plate through a driving mechanism, so that the driving mechanism drives the door machine hanging plate to move to switch the elevator door between the open-door state and the closed-door state. ​ ​ ​ ​ ​ ​ 7. The door holding open device of claim 6, wherein ​ ​ ​ ​ ​ 9. An elevator installation, characterized in that ​ ​ ​ ​

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