CN213637738U - Intercom system and elevator - Google Patents
Intercom system and elevator Download PDFInfo
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- CN213637738U CN213637738U CN202022914493.3U CN202022914493U CN213637738U CN 213637738 U CN213637738 U CN 213637738U CN 202022914493 U CN202022914493 U CN 202022914493U CN 213637738 U CN213637738 U CN 213637738U
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Abstract
The utility model relates to an intercom system and elevator, wherein this intercom system is including the intercom, audiphone wireless circuit amplification equipment and the audiphone wireless circuit antenna that connect gradually. The interphone comprises a wireless loop amplifying device driving circuit and a line voice conversion circuit, the wireless loop amplifying device driving circuit is respectively connected with the hearing aid wireless loop amplifying device and the line voice conversion circuit, and the line voice conversion circuit is used for being connected with a communication cable. Therefore, when the circuit voice conversion circuit acquires a voice signal from the communication cable, the voice signal can be transmitted to the hearing aid through the wireless loop amplification device driving circuit, the hearing aid wireless loop amplification device and the hearing aid wireless loop antenna in sequence, so that the voice signal can be effectively communicated with a user wearing the hearing aid, rescue and pacify services are provided for the user, the rescue efficiency can be improved, and the risk of accidental injury is reduced.
Description
Technical Field
The utility model relates to a radio equipment technical field, especially an intercom system and elevator.
Background
With the rapid development of society, elevators have been applied to various aspects of life to transport people and goods and to serve vertical areas of life and production work. When the elevator breaks down, the interphone on the elevator is used as an effective tool for communicating with the outside, so that the trapped person can be conveniently communicated with the outside in time. However, the conventional technology has not set a matched intercom system for the user with hearing impairment, and when the elevator is trapped, the elevator cannot be effectively communicated with the trapped people.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide an intercom system and an elevator that can effectively communicate with a user with hearing impairment.
To achieve the above object, in one aspect, an embodiment of the present application provides an intercom system, including:
an interphone; the interphone comprises a wireless loop amplifying device driving circuit and a line voice conversion circuit which are sequentially connected; the line voice conversion circuit is used for connecting a communication cable;
the hearing aid wireless loop amplifying device is connected with the wireless loop amplifying device driving circuit;
the hearing aid wireless loop antenna is connected with the hearing aid wireless loop amplifying equipment; the hearing aid wireless loop antenna is used for transmitting communication signals.
In one embodiment, the hearing aid wireless loop antenna is located on the top or bottom of the elevator car.
In one embodiment, the hearing aid wireless loop antenna is wound in a clockwise direction and laid on the same horizontal plane.
In one embodiment, the interphone further comprises a communication control circuit and a loudspeaker driving circuit;
the communication control circuit is respectively connected with the wireless loop amplifying equipment driving circuit and the line voice conversion circuit; the loudspeaker driving circuit is connected between the wireless loop amplifying device driving circuit and the line voice conversion circuit.
In one embodiment, the interphone further comprises a side tone and echo eliminating circuit; the side-tone and echo cancellation circuit is connected between the line voice conversion circuit and the speaker driving circuit.
In one embodiment, the interphone further comprises a microphone driving circuit connected with the side tone and echo eliminating circuit.
In one embodiment, the communication control circuit is a DTMF communication control circuit.
In one embodiment, the interphone further comprises a power supply circuit for connecting the communication cable; the power supply circuit is respectively connected with the voice conversion circuit and the wireless loop amplifying equipment driving circuit.
On the other hand, the embodiment of the application also provides an elevator, which comprises an elevator car and the intercom system in any embodiment; the interphone and the hearing aid wireless loop antenna are arranged in the elevator car.
In one embodiment, an elevator car comprises a non-metallic wall panel; the non-metal wall plate is attached to the hearing aid wireless loop antenna.
The intercom system and the elevator comprise an intercom, a hearing aid wireless loop amplifying device and a hearing aid wireless loop antenna which are sequentially connected. The interphone comprises a wireless loop amplifying device driving circuit and a line voice conversion circuit, the wireless loop amplifying device driving circuit is respectively connected with the hearing aid wireless loop amplifying device and the line voice conversion circuit, and the line voice conversion circuit is used for being connected with a communication cable. Therefore, when the circuit voice conversion circuit acquires a voice signal from the communication cable, the voice signal can be transmitted to the hearing aid through the wireless loop amplification device driving circuit, the hearing aid wireless loop amplification device and the hearing aid wireless loop antenna in sequence, so that the voice signal can be effectively communicated with a user wearing the hearing aid, rescue and pacify services are provided for the user, the rescue efficiency can be improved, and the risk of accidental injury is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a schematic configuration of an intercom system in one embodiment;
fig. 2 is a schematic diagram of the arrangement of the wireless loop antenna of the hearing aid in one embodiment;
FIG. 3 is a first schematic block diagram of an intercom system in one embodiment;
FIG. 4 is a second schematic block diagram of an intercom system in one embodiment;
FIG. 5 is a third schematic block diagram of an intercom system in one embodiment;
FIG. 6 is a schematic diagram of the setup of the intercom system in one embodiment;
FIG. 7 is a fourth schematic block diagram of an intercom system in one embodiment.
Description of reference numerals:
the system comprises an interphone-10, a wireless loop amplifying device driving circuit-110, a line voice conversion circuit-120, a communication control circuit-130, a loudspeaker driving circuit-140, a side sound and echo eliminating circuit-150, a microphone driving circuit-160, a power supply circuit-170, a hearing aid wireless loop amplifying device-20 and a hearing aid wireless loop antenna-30.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
For ease of understanding, the following embodiments will be described by taking a hearing aid and an elevator car as examples. However, it is understood that the following embodiments provide an intercom system that may be used in various applications, particularly in enclosed environments, such as various types of vehicles, to ensure that users with hearing impairment can communicate effectively through the intercom system. Meanwhile, in the following embodiments, the hearing aid may be replaced by a wireless earphone, a wireless helmet, a wireless interphone, and other devices having a function of wirelessly receiving audio data. The "hearing impaired user" described in the present specification may be a user and/or a hearing impaired person who is temporarily impaired in hearing (e.g., wearing an earphone, a helmet, or other hearing-reducing device).
As background, conventional intercom systems are not suitable for users with hearing impairment, such as hearing impaired people who have difficulty communicating with the conventional intercom system while riding an elevator. If the elevator is trapped and fails, the user is easy to be anxious and the risk of accidental injury is increased and the rescue efficiency is reduced because effective communication cannot be carried out. In view of the above, it is desirable to provide an intercom system and an elevator that can effectively communicate with a user with hearing impairment.
In one embodiment, as shown in fig. 1, there is provided an intercom system comprising:
an interphone 10; the interphone 10 comprises a wireless loop amplifying device driving circuit 110 and a line voice converting circuit 120 which are connected in sequence; the line voice conversion circuit 120 is used for connecting a communication cable;
a hearing aid wireless circuit amplification device 20 connected to the wireless circuit amplification device drive circuit 110;
a hearing aid wireless loop antenna 30 connected to the hearing aid wireless loop amplification device 20; the hearing aid wireless loop antenna 30 is used to transmit communication signals.
Specifically, the intercom 10 may be disposed at a corresponding place according to an application environment of the intercom system, so that the user can communicate with the remote intercom. The hearing aid wireless LOOP amplifying device 20 is a hearing aid LOOP device (Teleloop Amplifier) for converting an input signal into a carrier modulation signal by an internal circuit and outputting the carrier modulation signal. The hearing aid wireless LOOP antenna 30, i.e. the hearing aid LOOP antenna, is used to transmit signals in a spatially radiating manner. Further, the positions of the hearing aid wireless loop amplifying device 20 and the hearing aid wireless loop antenna 30 can be determined according to the setting environment of the intercom system, and the present application is not limited thereto. Illustratively, the hearing aid wireless loop amplification device 20 may be placed on top of the elevator car to facilitate power extraction.
Specifically, the intercom 10 includes a wireless-loop amplification-device driving circuit 110 and a line voice conversion circuit 120, and the line voice conversion circuit 120 is connected to the wireless-loop amplification-device driving circuit 110 and used for connecting a communication cable. When sending a voice signal to the remote intercom, the line voice conversion circuit 120 may send the voice signal through the communication cable after converting the local voice signal into a voice signal suitable for transmission over the communication cable; when receiving the sound signal transmitted from the outside, the line voice conversion circuit 120 may receive the sound signal transmitted from the remote intercom from the communication cable, convert the sound signal into a local voice signal, and transmit the local voice signal to the wireless loop amplification apparatus driving circuit 110. The wireless loop amplification device driver circuit 110 converts the local voice signal so that the converted signal matches the hearing aid wireless loop amplification device 20.
The hearing aid wireless loop amplifying device 20 is connected to the wireless loop amplifying device driving circuit 110, and further may be electrically connected to the wireless loop amplifying device driving circuit 110 to receive a signal transmitted from the wireless loop amplifying device driving circuit 110, and modulate the received signal into a carrier modulation signal and output the modulated signal. The hearing aid wireless loop antenna 30 is connected to the hearing aid wireless loop amplification device 20. Further, it may be electrically connected to the hearing aid wireless loop amplification device 20 and transmit the received carrier modulated signal. Thus, when a user wearing the hearing aid is in the elevator car, the hearing aid of the user can receive the signal transmitted by the hearing aid wireless loop antenna 30, so that the user can listen to the rescue appeasing prompt of the rescue service organization and effectively communicate with the remote interphone.
In the above intercom system, when the line voice converting circuit 120 obtains a voice signal from the communication cable, the voice signal can be transmitted to the hearing aid through the wireless loop amplifying device driving circuit 110, the hearing aid wireless loop amplifying device 20 and the hearing aid wireless loop antenna 30 in sequence, so that the voice signal can be effectively communicated with a user wearing the hearing aid, rescue and pacify services can be provided for the user, and then rescue efficiency can be improved and risks of accidental injuries can be reduced.
In one embodiment, the hearing aid wireless loop antenna 30 is disposed on the top or bottom of the elevator car. When audiphone wireless return circuit antenna 30 sets up the top at elevator car, can be from last down transmitting signal, when audiphone wireless return circuit antenna 30 sets up the bottom at elevator car, can be from up transmitting signal down to make the signal can cover the arbitrary corner in the car, improve the coverage of signal, and then can ensure that the user that hearing is obstructed all can listen to rescue pacify suggestion of rescue service organization well, and improve the reliability of communication. So, for setting up the antenna in control box panel position, the setting mode of this application possesses the wide, advantage that the signal is stable of coverage.
Further, the hearing aid wireless loop antenna 30 can be arranged at the top of the elevator car to avoid the influence of the carrying condition of the elevator on communication signals, so that the communication signals with better quality can be provided when the elevator is idle or crowded, and the reliability of the intercom system can be improved.
The hearing aid wireless loop antenna 30 may be looped around in a manner such that after the looping, each turn of the cable of the hearing aid wireless loop antenna 30 is arranged on the same horizontal plane, i.e. each turn of the cable is laid in parallel on the same horizontal plane. Further, the hearing aid wireless loop antenna 30 may be looped around in a clockwise direction, and the number of loops of the loop may be determined according to the space area of the elevator car, the distance between the hearing aid wireless loop antenna 30 and the user, and/or the transmission parameter of the hearing aid wireless loop antenna 30. Illustratively, as shown in fig. 2, the hearing aid wireless loop antenna 30 may be looped around 3 to 5 turns in the clockwise direction, and the looping range of the antenna covers the entire car as much as possible.
In one embodiment, as shown in FIG. 3, the intercom 10 may also include a communication control circuit 130 and a speaker driver circuit 140. The communication control circuit 130 is connected to the wireless loop amplifying device driving circuit 110 and the line voice converting circuit 120, and is configured to generate a communication signaling, control the transmission and reception of the signaling, interpret the received signaling, control the working logic of each working module, and prompt ringing, and the like for the interphone 10, so as to control the working states of the line voice converting circuit 120 and the wireless loop amplifying device driving circuit 110.
It should be noted that, in the present application, the communication control circuit 130 may be implemented based on any communication method in the prior art, and may support one or more communication methods, which is not specifically limited in the present application. Illustratively, the communication control circuit 130 of the present application may be a DTMF (Dual Tone Multi Frequency) communication control circuit, that is, the line voice conversion circuit 120 and the wireless loop amplifying device driving circuit 110 are respectively controlled by DTMF transceiving code technology.
The speaker driving circuit 140 is connected between the wireless-circuit amplification-device driving circuit 110 and the line voice conversion circuit 120, that is, the line voice conversion circuit 120, the speaker driving circuit 140, and the wireless-circuit amplification-device driving circuit 110 are connected in sequence, and when signal transmission is performed, the signal transmission can be performed in sequence according to the connection order. The speaker driver circuit 140 may be used to connect to a speaker and drive the speaker to emit sound according to the local voice signal sent by the line voice conversion circuit 120, so that the local voice signal can be played through the speaker to enable a user in the elevator car to hear a remote sound. The speaker driver circuit 140 is also connected to the wireless loop amplification apparatus driver circuit 110 so that a local voice signal can be forwarded to the wireless loop amplification apparatus driver circuit 110 or a speaker driver signal can be sent to the wireless loop amplification apparatus driver circuit 110.
In one embodiment, as shown in fig. 4, the intercom 10 may also include a side-tone and echo cancellation circuit 150. The side-tone and echo cancellation circuit 150 is connected between the speaker driving circuit 140 and the line voice conversion circuit 120, and is used for processing local echo and side-tone of the communication cable. When the line voice converting circuit 120 outputs the local voice signal, the sidetone and echo canceling circuit 150 cancels the sidetone of the cable in the local voice signal, and outputs the canceled local voice signal to the speaker driving circuit 140, so that the speaker driving circuit 140 drives the speaker to play audio according to the signal, and sends the local voice signal to the wireless loop amplifying device driving circuit 110. Thus, the interference caused by signal transmission is reduced, and the communication quality can be improved.
In one embodiment, as shown in fig. 5, the intercom 10 further includes a microphone driving circuit 160, and the microphone driving circuit 160 is connected to the side-tone and echo cancellation circuit 150 and is used for connecting a microphone. The microphone driving circuit 160 is configured to receive a local voice signal collected by a microphone, perform signal amplification and/or AGC (Automatic Gain Control) input equalization Control on the received signal, and output the processed signal to the sidetone and echo cancellation circuit 150. The side-tone and echo cancellation circuit 150 cancels local echo in the signal, and the cancelled signal is converted by the line voice conversion circuit 120 and then output to the remote interphone through the communication cable. Thus, by adding the microphone driving circuit 160, a conversation with a remote intercom can be realized, and the effectiveness of communication can be further improved.
In one embodiment, the intercom 10 may also include a power supply circuit. The power supply circuit is used for connecting a communication cable, and through the design of alternating current high impedance matching, on the basis of not losing sound signals on the communication cable, power is taken from the communication cable, and input voltage is converted into working voltage matched with each circuit to supply power for each circuit in the interphone 10. The power supply circuit may be connected to the voice conversion circuit 120 and the wireless loop amplifying device driving circuit 110, and further, the power supply circuit may be connected to the communication control circuit 130, the side-tone and echo cancellation circuit 150, the speaker driving circuit 140, and the microphone driving circuit 160.
To facilitate understanding of the aspects of the present application, a specific example will be described below. As shown in fig. 6, an intercom system is provided comprising an intercom 10, a hearing aid wireless loop amplification device 20 and a hearing aid wireless loop antenna 30. The hearing aid wireless loop amplifying device 20 and the hearing aid wireless loop antenna 30 are arranged at the top of the elevator car, the hearing aid wireless loop antenna 30 can be wound by 3 to 5 circles in a clockwise mode, cables of all the circles are laid in parallel on the same horizontal plane, and the surrounding range of the antenna covers the area of the whole elevator car as far as possible.
The block diagram of the intercom 10 can be as shown in fig. 7, and specifically includes a power supply circuit 170, a line voice conversion circuit 120, a communication control circuit 130 (specifically, a DTMF communication control circuit), a wireless loop amplification device driving circuit 110, a sidetone and echo cancellation circuit 150, a speaker driving circuit 140, and a microphone driving circuit 160.
The power supply circuit 170 is connected to the DTMF communication control circuit, and is used for connecting a communication cable. The DTMF communication control circuit is connected to the wireless loop amplifying device driving circuit 110 and the line voice converting circuit 120, the line voice converting circuit 120 is connected to the side-tone and echo canceling circuit 150, the side-tone and echo canceling circuit 150 is connected to the speaker driving circuit 140 and the microphone driving circuit 160, the microphone driving circuit 160 is connected to the microphone, and the speaker driving circuit 140 is connected to the speaker. The power supply circuit 170 is a circuit designed based on ac high impedance matching, and can take power from the 2-wire intercom system cable without loss of sound signals, and convert the input voltage into a working voltage matched with an internal circuit, thereby supplying power to each circuit. The line voice conversion circuit 120 is used to convert the local voice signal collected by the microphone into a sound signal suitable for transmission over the 2-wire intercom system cable (i.e., the communication cable), and to convert the sound signal sent by the remote intercom into a local voice signal. The speaker driving circuit 140 is used for driving the speaker to generate sound through the driving circuit according to the received local voice signal. The wireless loop amplification device driver circuit 110 is configured to convert the received local voice signal into a signal matched to the hearing aid wireless loop amplification device 20, and output the converted signal to the hearing aid wireless loop amplification device 20. The DTMF communication control circuit is used for realizing communication signal generation, signaling receiving and sending control, signaling receiving and interpreting, working logic control of each functional module, ringing prompt and the like of the interphone 10 by means of a DTMF code receiving and sending technology. The microphone driving circuit 160 is used for collecting microphone voice and implementing functions such as signal amplification and AGC input equalization control. The side-tone and echo cancellation circuit 150 is used to cancel local echo and cable side-tones.
As described above, by integrating the wireless circuit amplifier device driver circuit 110 into the intercom 10, it is possible to output the pacifying of the rescue service organization and the rescue plan voice to the hearing aid wireless circuit amplifier device 20, and to transmit the same by spatial radiation through the hearing aid wireless circuit antenna 30, thereby ensuring that the deaf-dumb or the weak-listening person wearing the hearing aid can favorably listen to the rescue pacifying prompt of the rescue service organization.
In one embodiment, an elevator is provided, comprising an elevator car and the intercom system of any of the above embodiments. The interphone 10 and the hearing aid wireless loop antenna 30 of the intercom system are both arranged in the elevator car, and further, the specific arrangement positions of the interphone 10 and the hearing aid wireless loop antenna 30 can be determined according to actual conditions, which is not limited in the present application.
In one embodiment, the elevator car comprises a non-metal wall plate, the non-metal wall plate is attached to the hearing aid wireless loop antenna 30, namely, the hearing aid wireless loop antenna 30 is laid on the non-metal wall plate, so that the influence of the wall plate on the transmission signal can be avoided, and the reliability of communication is improved. Simultaneously, for setting up the antenna in control box panel position, the setting mode of this application possesses the wide, stable advantage of signal of coverage. For example, when the hearing aid wireless loop antenna 30 is disposed on top of an elevator car, the top wall panel of the elevator car is made of a non-metallic material, such as a non-metallic illuminated ceiling or a non-metallic appliance ceiling.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., 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, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An intercom system, comprising:
an interphone; the interphone comprises a wireless loop amplifying device driving circuit and a line voice conversion circuit which are sequentially connected; the line voice conversion circuit is used for connecting a communication cable;
the hearing aid wireless loop amplifying device is connected with the wireless loop amplifying device driving circuit;
a hearing aid wireless loop antenna connected to the hearing aid wireless loop amplification device; the hearing aid wireless loop antenna is used for transmitting communication signals.
2. The intercom system according to claim 1, wherein said hearing aid wireless loop antenna is disposed on the top or bottom of an elevator car.
3. The intercom system according to claim 2, wherein said hearing aid wireless loop antenna is wound in a clockwise direction and laid on the same horizontal plane.
4. The intercom system according to claim 1, wherein said intercom further comprises a communication control circuit and a speaker driving circuit;
the communication control circuit is respectively connected with the wireless loop amplifying equipment driving circuit and the line voice conversion circuit; the loudspeaker driving circuit is connected between the wireless loop amplifying equipment driving circuit and the line voice conversion circuit.
5. The intercom system according to claim 4, wherein said intercom further includes a sidetone and echo cancellation circuit; the side-tone and echo cancellation circuit is connected between the line voice conversion circuit and the loudspeaker drive circuit.
6. The intercom system according to claim 5, wherein said intercom further comprises a microphone driving circuit connected to said sidetone and echo cancellation circuit.
7. The intercom system according to any one of claims 4 to 6, wherein said communication control circuit is a DTMF communication control circuit.
8. The intercom system according to any one of claims 1 to 6, wherein said intercom further comprises a power supply circuit for connecting said communication cable; and the power supply circuit is respectively connected with the line voice conversion circuit and the wireless loop amplifying equipment driving circuit.
9. An elevator, characterized by comprising an elevator car and an intercom system according to any one of claims 1 to 8; the interphone and the hearing aid wireless loop antenna are arranged in the elevator car.
10. The elevator of claim 9, wherein the elevator car comprises a non-metallic wall panel; the nonmetal wallboard is attached to the hearing aid wireless loop antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022914493.3U CN213637738U (en) | 2020-12-07 | 2020-12-07 | Intercom system and elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022914493.3U CN213637738U (en) | 2020-12-07 | 2020-12-07 | Intercom system and elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213637738U true CN213637738U (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022914493.3U Active CN213637738U (en) | 2020-12-07 | 2020-12-07 | Intercom system and elevator |
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| Country | Link |
|---|---|
| CN (1) | CN213637738U (en) |
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2020
- 2020-12-07 CN CN202022914493.3U patent/CN213637738U/en active Active
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