CN115973869A - Car door structure and elevator - Google Patents
Car door structure and elevator Download PDFInfo
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- CN115973869A CN115973869A CN202211627014.7A CN202211627014A CN115973869A CN 115973869 A CN115973869 A CN 115973869A CN 202211627014 A CN202211627014 A CN 202211627014A CN 115973869 A CN115973869 A CN 115973869A
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Abstract
The invention discloses a car door structure and an elevator, wherein the car door structure comprises a car door body and a monitoring assembly, the monitoring assembly is adjacent to the car door body, the monitoring assembly comprises a first sensor and a second sensor, a transmitting receiver of the first sensor faces the outside of a car of the elevator, a transmitting receiver of the second sensor faces the inside of the car, and a monitoring area of the first sensor is partially overlapped with a monitoring area of the second sensor. By arranging the two sensors, the first sensor emphasizes monitoring of environmental information outside the car, and the second sensor emphasizes monitoring of environmental information inside the car, so that monitoring blind areas of the monitoring assembly can be reduced; the monitoring area parts of the first sensor and the second sensor are overlapped, the overlapped part is the area of the door of the car, at the moment, the first sensor and the second sensor can mutually compensate the monitoring data of the exposure range, the operation blind area is reduced, and the door area of the whole car can be monitored.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to a car door structure and an elevator comprising the car door structure.
Background
In the prior art, the door closing control conditions of the elevator are generally as follows: when a passenger presses a door closing button after entering the car, the control system starts the driving mechanism when receiving a door closing signal, so that the car door is closed; when no passenger enters the car or presses the door closing button, the control system automatically starts the driving mechanism to close the car door after waiting for the preset automatic door closing time.
In addition, the elevator among the prior art all is provided with monitoring devices, and the sedan-chair door is in closing the action when the passenger gets into the elevator, and monitoring devices can send a signal to control system, can start actuating mechanism after control system receives the signal, makes the sedan-chair door change from closing the action into opening the action to prevent that personnel or article from being pressed from both sides impaired.
There are generally two types of monitoring devices: surveillance cameras and active sensors. The monitoring camera is generally installed in the rear portion of elevator car, but when gathering the image through the monitoring camera, sheltered from by the passenger in the car very easily to, the application environment of elevator is very different, and the interior and the outdoor ambient light of hall of car also have great difference, and these all probably influence image acquisition quality. Therefore, as shown in fig. 1, the active sensor 3 'is installed at the middle position of the lintel upper frame of the car door of the car 1', and the optical axis of the active sensor 3 'is opposite to the ground, so as to observe the passenger status outside the hall and inside the car 1' and actively adjust and adapt to the ambient light, thereby avoiding the influence of the ambient light, but the following defects exist in the arrangement:
(1) When the active sensor 3 ' simultaneously detects the ranges outside the hall and in the lift car 1 ', the range of the areas outside the hall and in the lift car 1 ' which can be detected is smaller;
(2) After the car door 2 'is closed, the distance between the car door 2' and the active sensor 3 'is short, the included angle is small, after the near infrared light emitted by the active sensor 3' reaches the car door 2 ', most of the near infrared light in the region (1) returns to the receiving end of the active sensor 3' along the original path, so that the reflected light received by the active sensor 3 'is too strong, in order to ensure that the intensity of the reflected light received by the sensor 3' is within a reasonable range, the active sensor 3 'can actively reduce the emitted photoelectric intensity, therefore, for the region (2) and the region (3) with low internal reflection intensity in the car 1', because the reflected light intensity is low, the reflected light quantity of the two regions can also be lower than the reasonable range, so that the image recognition of the region (2) and the region (3) is difficult, the information detection of the region (2) and the region (3) cannot be realized, further influencing the state monitoring of passengers and the control over the passengers, and reducing the use feeling of the elevator.
Disclosure of Invention
One object of an embodiment of the present invention is to: provided is a car door structure capable of monitoring the entire area of a car doorway.
Another object of an embodiment of the present invention is to: provided is an elevator with a high safety factor.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a car door structure is provided, which comprises a car door body and a monitoring component, wherein the monitoring component is adjacent to the car door body, the monitoring component comprises a first sensor and a second sensor, a transmitter and a receiver of the first sensor face the outside of a car of an elevator, a transmitter and a receiver of the second sensor face the inside of the car, and a monitoring area of the first sensor partially coincides with a monitoring area of the second sensor.
As a preferable scheme of the car door structure, the car door body comprises a strong reflection area and a weak reflection area which are arranged along the vertical direction, the transmitting and receiving device of the first sensor is over against the strong reflection area, and the monitoring area of the second sensor is spaced from the strong reflection area.
As a preferable scheme of the car door structure, the first sensor and the second sensor are arranged in a direction perpendicular to the car door body, and the first sensor is located outside the second sensor.
The monitoring assembly is mounted on the door lintel plate, and the monitoring assembly is mounted on the door lintel plate.
Preferably, the monitoring assembly is mounted to the door lintel plate at a medial region of the door lintel plate.
As a preferred solution to the door structure, the monitoring assembly is threadably connected to the door lintel plate.
As a preferred scheme of a car door structure, the monitoring assembly comprises a shell, the first sensor and the second sensor are both installed in the shell, a light hole is formed in the shell, and the first sensor and the second sensor transmit and receive light through the light hole.
As a preferable scheme of the car door structure, the monitoring assembly comprises an optical filter, the optical filter is fixed in the light-transmitting hole, and the optical filter is used for filtering light emitted and received by the first sensor and the second sensor.
As a preferred scheme of a car door structure, the light holes comprise a first light hole and a second light hole, the lens of the first sensor is fixed in the first light hole, the lens of the second sensor is fixed in the second light hole, and the axes of the first light hole and the second light hole are obliquely arranged.
As a preferable scheme of the car door structure, the housing includes a housing body and a panel, a cavity is provided in the housing body, the panel is connected to the housing body to close an opening of the cavity, the first sensor and the second sensor are both disposed in the cavity, the first light hole and the second light hole are both disposed on the panel, the panel has a first side surface far away from the cavity, and an edge area of the first side surface is recessed.
As a preferable scheme of the car door structure, one end of the first light-transmitting hole, which is far away from the inner side of the shell, is in a trumpet shape; and/or the presence of a gas in the gas,
the second light-transmitting hole is far away from one end of the inner side of the shell and is in a trumpet shape.
In a second aspect, an elevator is provided, which comprises the car door structure.
The invention has the beneficial effects that: by arranging the two sensors, the first sensor emphasizes monitoring of environmental information outside the car, and the second sensor emphasizes monitoring of environmental information inside the car, so that monitoring blind areas of the monitoring assembly can be reduced; the monitoring areas of the first sensor and the second sensor are partially overlapped, the overlapped part is the area of the car door, at the moment, the first sensor and the second sensor can mutually compensate the monitoring data of the exposure range, and the door area of the whole car can be monitored.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 presents a diagrammatic illustration of an elevator according to the prior art.
Fig. 2 is a schematic view of an elevator according to an embodiment of the present invention.
FIG. 3 is a schematic view of a car door according to an embodiment of the invention.
Fig. 4 is a partial schematic view of a viewing angle of the car door structure according to the embodiment of the invention.
Figure 5 is a schematic cross-sectional view of a car door structure according to an embodiment of the present invention.
Fig. 6 is an enlarged schematic view of a portion a of fig. 5.
FIG. 7 is a partial schematic view of another perspective of the car door structure according to the embodiment of the invention.
In fig. 1:
1', a car; 2', a car door; 3', an active sensor;
in fig. 2 to 7:
1. a car; 2. a car door body; 21. a strong reflection region; 22. a weak reflection region; 3. a door lintel plate; 31. a stud; 4. a nut; 5. a monitoring component; 51. a first sensor; 52. a second sensor; 53. a housing; 531. a panel; 5311. a first side; 5312. a second side surface; 5313. a first light-transmitting hole; 5314. a second light-transmitting hole; 532. a housing body; 533. mounting holes; 54. a signal line; 6. and a filter.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 2 and 3, the car door structure provided by the invention comprises a car door body 2 and a monitoring assembly 5, wherein the monitoring assembly 5 is adjacent to the car door body 2, the monitoring assembly 5 comprises a first sensor 51 and a second sensor 52, a transmitter and a receiver of the first sensor 51 face the outside of a car 1 of an elevator, a transmitter and a receiver of the second sensor 52 face the inside of the car 1, a monitoring area of the first sensor 51 is partially overlapped with a monitoring area of the second sensor 52, and the transmitter and the receiver are a general name of the transmitter and the receiver. By arranging two sensors, the first sensor 51 is used for monitoring the environment information outside the car 1, and the second sensor 52 is used for monitoring the environment information inside the car 1, so that the monitoring blind area of the monitoring component 5 can be reduced; the monitoring area parts of the first sensor 51 and the second sensor 52 are overlapped, the overlapped part is the area of the doorway of the car 1, at the moment, the first sensor 51 and the second sensor 52 can mutually compensate the monitoring data of the exposure range, the doorway area inside and outside the whole car 1 can be monitored, and the condition that the data cannot be collected due to the exposure problem of specular reflection after the car door 2 is closed is avoided.
In this embodiment, the first sensor 51 and the second sensor 52 are mainly used for monitoring the status of people in the doorway area of the car 1, the first sensor 51 and the second sensor 52 are connected to the driving mechanism of the car door body 2 through a signal line 54 and send signals to the driving mechanism of the car door body 2 to control the opening and closing of the car door body 2, for example, when it is monitored that passengers enter and exit the doorway area of the car door body 2, the first sensor 51 and the second sensor 52 send signals to the driving mechanism of the car door body 2 to keep the car door body 2 open, so as to avoid the car door body 2 from catching the passengers.
In the present embodiment, the first sensor 51 and the second sensor 52 are both active sensors, and specifically, the first sensor 51 and the second sensor 52 are both ToF sensors (ToF, time of flight), which are in the prior art, and the ToF sensors calculate the distance between the transmitter and the receiver by measuring the "Time of flight" of signals such as ultrasonic waves, microwaves, light, and the like between the transmitter and the receiver. The sensor that can implement ToF ranging is the ToF sensor. ToF sensors are widely used, and most ToF sensors are used for measuring distance by infrared or laser light, and use a tiny emitter to emit infrared light or laser light, wherein the generated light bounces off any object and returns to the ToF sensor, and the ToF sensor can measure the distance between the object and the sensor according to the time difference between the emission of the light and the return of the light to the ToF sensor after the light is reflected by the object.
Specifically, the car door body 2 includes a strong reflection region 21 and a weak reflection region 22 arranged along the vertical direction, the strong reflection region 21 is close to the monitoring component 5, the weak reflection region 22 is far from the monitoring component 5, the transceiver of the first sensor 51 is over against the strong reflection region 21, the monitoring region of the second sensor 52 is spaced from the strong reflection region 21, in this embodiment, the strong reflection region 21 corresponds to the region (1) of fig. 1, and the weak reflection region 22 corresponds to the region (1) of fig. 1(2) And (4) a region. By arranging the transceiver of the first sensor 51 facing the strong reflection area 21 and the monitoring area of the second sensor 52 spaced from the strong reflection area 21, at which the exposure values of the first sensor 51 and the second sensor 52 are different, it can be understood that although the weak reflection area 22 is at the angle of view θ of the first sensor 51 1 Within range, but first sensor 51 can't monitor weak reflection zone 22, and at this moment, set up the monitoring area of second sensor 52 and strong reflection zone 21 interval, can avoid strong reflection zone 21 reflected light to cause the influence to second sensor 52's exposure value for synergism between second sensor 52 and the first sensor 51 monitors car 1 gate area jointly. Since the inclination angles of the first sensor 51 and the second sensor 52 are also related to the distance between the monitoring assembly 5 and the door body 2, the inclination angles α of the first sensor 51 and the second sensor 52 are set to be equal to each other 1 And alpha 2 And debugging is required according to a specific application scene.
Further, the first sensor 51 and the second sensor 52 are arranged in a direction perpendicular to the door body 2, and the first sensor 51 is located outside the second sensor 52. In this embodiment, the side of the second sensor 52 adjacent to the external environment is the outside of the second sensor 52, and since the transceiver of the first sensor 51 faces the outside of the car 1 of the elevator, the transceiver of the second sensor 52 faces the inside of the car 1, and the first sensor 51 is placed outside the second sensor 52, the installation of the first sensor 51 and the second sensor 52 can be facilitated.
Referring to fig. 4-7, in particular, the car door structure includes a lintel plate 3, the lintel plate 3 being located between the car door body 2 and the car 1, and a monitoring assembly 5 mounted on the lintel plate 3. The door lintel plate 3 is positioned high to allow simultaneous observation of conditions outside the car 1 and inside the car 1, to facilitate operation of the first sensor 51 and the second sensor 52, and to provide the monitoring assembly 5 on the door lintel plate 3 to facilitate operation of the monitoring assembly 5.
Preferably, the monitoring assembly 5 is mounted in the middle region of the lintel plate 3. By arranging the monitoring assembly 5 in the middle area of the door lintel plate 3, the monitoring ranges of the first sensor 51 and the second sensor 52 can cover the whole area of the doorway of the car 1, and dead monitoring areas on the left side and the right side of the doorway of the car 1 are avoided.
Further, the monitoring assembly 5 includes a housing 53, the first sensor 51 and the second sensor 52 are both installed in the housing 53, a light hole is provided on the housing 53, and the first sensor 51 and the second sensor 52 emit and receive light through the light hole. The first sensor 51 and the second sensor 52 are disposed in the housing 53, and in this case, the first sensor 51 and the second sensor 52 can be assembled together to form a whole, which facilitates the installation of the car door structure.
Further, the housing 53 of the monitoring assembly 5 and the door lintel plate 3 are threadedly connected. It will be appreciated that the threaded connection is highly stable, ensuring that the monitoring assembly 5 can be securely fastened to the door lintel plate 3.
In this embodiment, the lower end of the door lintel plate 3 is bent to form a U-shaped groove, a through hole is formed in the bottom of the U-shaped groove, studs 31 are disposed on two sides of the through hole, the monitoring assembly 5 is disposed in the U-shaped groove, a housing 53 of the monitoring assembly 5 is provided with a mounting hole 533, the stud 31 passes through the mounting hole 533 and is connected with the nut 4, and the first sensor 51 and the second sensor 52 emit and receive light through the through hole on the door lintel plate 3. Further, the mounting hole 533 is U-shaped, so that the position of the monitoring assembly can be conveniently adjusted, and the manufacturing accuracy of the housing 53 is reduced.
Further, the light holes include a first light hole 5313 and a second light hole 5314, the lens of the first sensor 51 is fixed in the first light hole 5313, the lens of the second sensor 52 is fixed in the second light hole 5314, and axes of the first light hole 5313 and the second light hole 5314 are both inclined. Since the transceivers of the first sensor 51 and the second sensor 52 are inclined, and the inclined first light-transmitting hole 5313 and the inclined second light-transmitting hole 5314 are provided, the lenses of the first sensor 51 and the second sensor 52 can be conveniently fixed.
Specifically, the monitoring assembly 5 includes an optical filter 6, the optical filter 6 is disposed in each of the first light hole 5313 and the second light hole 5314, and the optical filter 6 is used for filtering light emitted from and received by the first sensor 51 and the second sensor 52. By providing the optical filter 6, the optical filter 6 can filter the interference light, and the monitoring accuracy of the first sensor 51 and the second sensor 52 is improved.
Specifically, the housing 53 includes a housing body 532 and a panel 531, a cavity is disposed in the housing body 532, the panel 531 is connected to the housing body 532 to close an opening of the cavity, the first sensor 51 and the second sensor 52 are disposed in the cavity, the first light hole 5313 and the second light hole 5314 are disposed on the panel 531, the panel 531 has a first side 5311 and a second side 5312 disposed opposite to each other, wherein the first side 5311 is far away from the first side 5311 of the cavity, an edge area of the first side 5311 is recessed, the second side 5312 is a plane, and at this time, the panel 531 is in a shape with a thick middle and thin two sides. Since the first light hole 5313 and the second light hole 5314 are both inclined and the edge region of the first side surface 5311 is recessed, the lengths of the hole walls at both sides of the first light hole 5313 and the second light hole 5314 can be shortened, and the shielding of the hole walls of the first light hole 5313 and the second light hole 5314 on light can be reduced, that is, the visual angle θ of the first sensor 51 to the first light hole 5313 and the second light hole 5314 can be reduced 1 And angle of view theta of second sensor 52 2 The influence of (c).
Furthermore, the end of the first light hole 5313 away from the inner side of the housing 53 is flared, and the end of the second light hole 5314 away from the inner side of the housing 53 is flared. By providing the first light hole 5313 and the second light hole 5314 in a trumpet shape, the viewing angle θ of the first sensor 51 to the first light hole 5313 and the second light hole 5314 can be further reduced 1 And angle of view theta of second sensor 52 2 Ensures the monitoring range of the monitoring assembly 5.
In this embodiment, the first sensor 51 and the second sensor 52 are installed in a hidden manner, and only the transmitter and the receiver of the first sensor 51 and the second sensor 52 are visible, so that the appearance of the whole car door structure can be improved, and the influence of the monitoring assembly 5 on the movement of the car door body 2 can be reduced.
The embodiment also provides an elevator, which comprises the car 1 and the car door structure of any one of the embodiments, wherein the car door structure is installed at a door opening of the car 1. Because first sensor 51 and second sensor 52 can compensate the monitoring data of exposure range mutually, reduce the operation blind area, can monitor the region at whole car 1 gate, consequently, adopt the elevator of this sedan-chair door structure can accurately judge the regional passenger condition in car 1 gate to opening and closing of control sedan-chair door body 2 avoids pressing from both sides and hinders the passenger, factor of safety is high.
In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are based on the orientations and positional relationships shown in the drawings for convenience in description and simplicity in operation, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The technical principles of the present invention have been described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (12)
1. The utility model provides a sedan-chair door structure, includes sedan-chair door body and monitoring subassembly, the monitoring subassembly is adjacent to sedan-chair door body, its characterized in that, the monitoring subassembly includes first sensor and second sensor, the transceiver of first sensor is outside towards the car of elevator, the transceiver of second sensor orientation in the car, the monitoring area of first sensor with the monitoring area part coincidence of second sensor.
2. The door structure of claim 1, wherein the door body comprises a strong reflection area and a weak reflection area arranged in a vertical direction, the transceiver of the first sensor faces the strong reflection area, and the monitoring area of the second sensor is spaced apart from the strong reflection area.
3. The door structure of claim 1, wherein the first sensor and the second sensor are arranged in a direction perpendicular to the door body, and the first sensor is located outside the second sensor.
4. The door structure of claim 1, comprising a door lintel plate positioned between the door body and the car, the monitoring assembly being mounted on the door lintel plate.
5. The door structure of claim 4, wherein the monitoring assembly is mounted in a middle region of the door lintel plate.
6. The door structure of claim 4, wherein the monitoring assembly and the door lintel plate are threadably connected.
7. The door structure of claim 1, wherein the monitoring assembly comprises a housing, the first sensor and the second sensor are both mounted within the housing, the housing having a light transmissive aperture, the first sensor and the second sensor emitting and receiving light through the light transmissive aperture.
8. The door structure of claim 7, wherein said monitoring assembly comprises a filter secured within said light-transmissive aperture, said filter for filtering light emitted and received by said first sensor and said second sensor.
9. The car door structure of claim 7, wherein the light holes comprise a first light hole and a second light hole, the lens of the first sensor is fixed in the first light hole, the lens of the second sensor is fixed in the second light hole, and axes of the first light hole and the second light hole are both obliquely arranged.
10. The car door structure of claim 9, wherein the housing includes a housing body and a panel, a cavity is disposed in the housing body, the panel is connected to the housing body to close an opening of the cavity, the first sensor and the second sensor are disposed in the cavity, the first light hole and the second light hole are disposed in the panel, the panel has a first side surface away from the cavity, and an edge region of the first side surface is recessed.
11. The door structure of claim 9, wherein an end of the first light aperture distal from the interior of the housing is flared; and/or the presence of a gas in the gas,
the second light-transmitting hole is far away from one end of the inner side of the shell and is in a trumpet shape.
12. An elevator, characterized by comprising a car door structure according to any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211627014.7A CN115973869A (en) | 2022-12-16 | 2022-12-16 | Car door structure and elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211627014.7A CN115973869A (en) | 2022-12-16 | 2022-12-16 | Car door structure and elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115973869A true CN115973869A (en) | 2023-04-18 |
Family
ID=85975144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211627014.7A Pending CN115973869A (en) | 2022-12-16 | 2022-12-16 | Car door structure and elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115973869A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102530691A (en) * | 2012-02-13 | 2012-07-04 | 广州永日电梯有限公司 | Video light curtain system for single-side-door elevator |
| CN206580424U (en) * | 2016-01-13 | 2017-10-24 | 东芝电梯株式会社 | Elevator |
| CN113165833A (en) * | 2019-02-28 | 2021-07-23 | 株式会社日立制作所 | Sensor unit and elevator |
| CN217467211U (en) * | 2022-05-18 | 2022-09-20 | 安克创新科技股份有限公司 | Detection device and monitoring equipment with same |
| CN219098421U (en) * | 2022-12-16 | 2023-05-30 | 日立楼宇技术（广州）有限公司 | Car door structure and elevator |
-
2022
- 2022-12-16 CN CN202211627014.7A patent/CN115973869A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102530691A (en) * | 2012-02-13 | 2012-07-04 | 广州永日电梯有限公司 | Video light curtain system for single-side-door elevator |
| CN206580424U (en) * | 2016-01-13 | 2017-10-24 | 东芝电梯株式会社 | Elevator |
| CN113165833A (en) * | 2019-02-28 | 2021-07-23 | 株式会社日立制作所 | Sensor unit and elevator |
| CN217467211U (en) * | 2022-05-18 | 2022-09-20 | 安克创新科技股份有限公司 | Detection device and monitoring equipment with same |
| CN219098421U (en) * | 2022-12-16 | 2023-05-30 | 日立楼宇技术（广州）有限公司 | Car door structure and elevator |
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