CN210807756U - Light control device for cultural exhibition hall - Google Patents
Light control device for cultural exhibition hall Download PDFInfo
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- CN210807756U CN210807756U CN201921948209.5U CN201921948209U CN210807756U CN 210807756 U CN210807756 U CN 210807756U CN 201921948209 U CN201921948209 U CN 201921948209U CN 210807756 U CN210807756 U CN 210807756U
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Abstract
The utility model relates to a light control device for a cultural exhibition hall, which comprises a projector starting and stopping device, a light control device and a light control module, wherein the projector starting and stopping device is used for controlling the starting and stopping of a projector; the first starting device is coupled with the projector starting and stopping device and outputs a first starting signal when the projector stops working, and stops outputting the first starting signal when the projector starts working; the switch device is coupled with the first starting device to receive the first starting signal and output a switch signal; the signal judging device is coupled with the switching device to receive the switching signal, judge whether the switching signal is continuously output or not and output a judging signal; the first control device is coupled with the signal judging device to receive the judging signal and output a first control signal; the first light device is coupled to the first control device to receive the first control signal and responds to the first control signal to control the first spread light string to emit light. The utility model discloses can realize the simultaneous switch of multimedia projector and exhibition hall light, it is more convenient.
Description
Technical Field
The utility model belongs to the technical field of light control's technique and specifically relates to a light control device of culture exhibition hall is related to.
Background
The culture exhibition hall is a place for showing artworks, more artworks can be listed in the exhibition hall for people to enjoy, and in the exhibition hall, people who visit can be better informed of the value of the artworks, some multimedia display screens can be arranged, and some introductions about the artworks are put in the multimedia display screens through the multimedia projector.
The above prior art solutions have the following drawbacks: above-mentioned this kind is at the in-process of putting in on the display screen through multimedia projector to the artwork in the culture exhibition hall, can close the exhibition lamp in the exhibition hall usually, with the light intensity in reducing the exhibition hall, and then reinforcing visitors' visual experience, and after putting in, open the exhibition lamp again, so that visit people watch the artwork in the list, but in prior art, switch and the on-off control to light to the multimedia projector in the exhibition hall carry out the switch respectively, and is comparatively troublesome.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a culture exhibition hall light control device, but the switch of simultaneous control multimedia projector and exhibition hall light, it is comparatively convenient.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: culture exhibition hall light controlling means includes:
the projector starting and stopping device is used for controlling the starting and stopping of the projector;
the first starting device is coupled with the projector starting and stopping device and outputs a first starting signal when the projector stops working, and stops outputting the first starting signal when the projector starts working;
the switch device is coupled to the first starting device to receive a first starting signal and output a switch signal;
the signal judgment device is coupled with the switch device to receive the switch signal and output a judgment signal when the switch signal is continuously received;
the first control device is coupled with the signal judging device to receive the judging signal and output a first control signal;
the first light device is coupled to the first control device to receive a first control signal and responds to the first control signal to control the first spread light string to emit light.
By adopting the technical scheme, when the projector starting and stopping device stops the multimedia projector from throwing the multimedia projector to the media display screen, the first starting device outputs the first starting signal to start, the switching device starts to output the switching signal, the signal judging device outputs the judging signal when continuously receiving the switching signal so as to determine that the projector is in a stopping state, at the moment, the first control device outputs the first control signal, the first light device receives the first control signal and controls the first display lamp string to emit light, otherwise, when the projector starting and stopping device works and enables the multimedia projector to throw the media display screen, the first display lamp string stops emitting light, and then the multimedia projector and the exhibition hall light can be switched on and off at the same time, so that convenience is achieved.
Preferably, a photoelectric conversion device is coupled between the signal judgment device and the first control device, and the photoelectric conversion device receives the judgment signal and converts the judgment signal into an electric signal for fast output.
By adopting the technical scheme, the output of the judgment signal needs to be converted and output after continuously receiving the switching signal, so that the output speed of the judgment signal is reduced, and the judgment signal is converted into the electric signal to accelerate the transmission of the judgment signal by arranging the photoelectric conversion device.
Preferably, a signal amplification device is coupled between the photoelectric conversion device and the first control device, and the signal amplification device receives the converted electrical signal and amplifies and outputs the electrical signal.
Through adopting above-mentioned technical scheme, through setting up signal amplification device to amplify the signal of telecommunication of conversion, improve the intensity of signal, and then can accelerate the triggering to first controlling means.
Preferably, the method further comprises the following steps:
the second starting device is coupled with the projector starting and stopping device and outputs a second starting signal when the projector stops working, and stops outputting the second starting signal when the projector starts working;
the photosensitive detection device is coupled to the second starting device to receive a second starting signal, detect the light intensity in the exhibition hall and output a photosensitive detection signal;
the second control device is coupled to the photosensitive detection device to receive the photosensitive detection signal and output a second control signal;
and the second light device is coupled to the second control device to receive the second control signal and responds to the second control signal to control the second spread lamp string to emit light.
Through adopting above-mentioned technical scheme, at the in-process of first lighting device work, photosensitive detection device can detect the light intensity in the exhibition hall to output photosensitive detection signal, and start through second controlling means control second lighting device, so that second exhibition lamp cluster is luminous, improves the light intensity in the exhibition hall, and then can promote the definition that people visited the work of art.
Preferably, a signal filtering device is coupled between the second control device and the second light device, and the signal filtering device receives and filters the second control signal to remove an interference signal in the second control signal.
By adopting the technical scheme, the filtering device is arranged to remove the interference signal in the second control signal, so that the second control signal can quickly trigger the second light device.
Preferably, a signal delay device is coupled between the signal filtering device and the second lighting device, and the signal delay device receives the filtered second control signal and performs delay output.
By adopting the technical scheme, a certain delay time can be preset in the signal delay device, when the second control signal is continuously received in the delay time, the current light in the exhibition hall is darker, and the second control signal is output to trigger the second lighting device.
Preferably, the photosensitive detection device includes a photosensitive sensing unit, a photosensitive comparison unit and a photosensitive reference unit, the photosensitive sensing unit is coupled to the second starting device to receive the second starting signal, sense the light intensity in the exhibition hall and output a photosensitive signal, the photosensitive reference unit is used for providing a photosensitive upper limit signal for the photosensitive comparison unit, and the photosensitive comparison unit is coupled to the photosensitive sensing unit to receive the photosensitive signal and output a photosensitive detection signal when the photosensitive signal is greater than the photosensitive upper limit signal.
Through adopting above-mentioned technical scheme, photosensitive reference cell provides photosensitive upper limit signal, and photosensitive comparison unit carries out photosensitive detection signal's output again after receiving the photosensitive signal that is greater than photosensitive upper limit signal to carry out the work of second lighting device again when guaranteeing that the light is darker in the exhibition hall, be favorable to reducing the loss of electric energy.
Preferably, the photosensitive reference unit includes a signal reference portion for providing the photosensitive upper limit signal and a signal adjusting portion for adjusting the magnitude of the photosensitive upper limit signal.
Through adopting above-mentioned technical scheme, through setting up signal conditioning part to adjust the size of photosensitive upper limit signal, in order to adapt to the different exhibition hall region of light demand.
To sum up, the utility model discloses a beneficial technological effect does:
by arranging the projector starting and stopping device, the first starting device, the switching device, the signal judging device, the first control device and the first light device, the simultaneous switching of the multimedia projector and the light of the exhibition hall can be realized, and the convenience is realized;
through setting up signal amplification device to amplify the signal of telecommunication of conversion, improve the intensity of signal, and then can accelerate the triggering to first controlling means, so that first illuminator fast work.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the circuit structure of the present invention.
Fig. 3 is a schematic diagram of the circuit structure of the present invention.
In the figure, 1, a projector start-stop device; 2. a first starting device; 3. a switching device; 4. a first control device; 5. a first lighting device; 6. a photoelectric conversion device; 7. a signal amplification device; 8. a second actuating device; 9. a photosensitive detection device; 10. a second control device; 11. a second lighting device; 12. a signal filtering device; 13. a signal delay device; 14. a photosensitive sensing unit; 15. a photosensitive comparison unit; 16. a photosensitive reference cell; 17. a signal reference section; 18. a signal adjusting section; 19. and a signal judgment device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses a light control device for cultural exhibition hall, open including the projecting apparatus and stop device 1, first starting drive 2, switching device 3, signal judgement device 19, first controlling means 4, first lighting device 5 and second starting drive 8, photosensitive detection device 9, second controlling means 10, second lighting device 11.
Referring to fig. 2, the projector start-stop apparatus 1 is used for controlling the start and stop of the projector; the first starting device 2 is coupled to the projector starting and stopping device 1 and outputs a first starting signal when the projector stops working, and stops outputting the first starting signal when the projector starts working; the switching device 3 is coupled to the first starting device 2 for receiving the first starting signal and outputting a switching signal; the signal determining device 19 is coupled to the switch device 3 for receiving the switching signal and outputting a determining signal when the switching signal is continuously received; the first control device 4 is coupled to the signal determination device 19 for receiving the determination signal and outputting a first control signal; the first light device 5 is coupled to the first control device 4 to receive the first control signal and responds to the first control signal to control the first exhibition light string to emit light, so that the closed exhibition light in the exhibition hall is automatically turned on after the introduction of the artwork to the multimedia display screen in the exhibition hall is stopped.
The projector starting and stopping device 1 comprises a switch S, a projector power interface and a relay KM, wherein the type of the relay KM is preferably HH52P 1; the two ends of the switch S are respectively coupled to VCC voltage and a projector power interface, the two ends of the relay KM are respectively coupled to the projector power interface and a ground end, when the switch S is disconnected, the projector stops working, the relay KM is switched on, when the switch S is switched on, the projector starts working, and the relay KM is switched off.
The first starting device 2 comprises a normally closed contact KM-1 controlled by a relay KM, two ends of the normally closed contact KM-1 are respectively coupled to VCC voltage and a switch device 3, the switch S is disconnected, when the relay KM is switched on, the normally closed contact KM-1 is closed, otherwise, the switch S is closed, and when the relay KM is switched off, the normally closed contact KM-1 is disconnected; the switching device 3 includes a first resistor R1 and a first transistor Q1, the first transistor Q1 is preferably an NPN transistor, a base of the first transistor Q1 is coupled to the normally closed contact KM-1 through the first resistor R1, an emitter of the first transistor Q1 is grounded, a collector is coupled to the signal determination device 19, and when the normally closed contact KM-1 is closed, the first transistor Q1 is turned on and outputs a switching signal.
The signal determination device 19 includes a delay relay KT1 and a normally closed contact KT1-1 controlled by the delay relay KT1, in this embodiment, the model of the delay relay KT1 is preferably JSZ3F, two ends of the delay relay KT1 are respectively coupled to a VCC voltage and a collector of a first triode Q1, and two ends of the normally closed contact KT1-1 are respectively coupled to the VCC voltage and the first control device 4; the certain time of predetermineeing in the time delay relay KT1, first triode Q1 switches on and output switching signal to time delay relay KT1 and through the time of predetermineeing after, time delay relay KT1 switches on, and normally closed contact KT1-1 is closed and output judgement signal, and then can confirm that the projecting apparatus is in the off-state to when reducing the mistake and touching the projecting apparatus and leading to the projecting apparatus to close, the luminous condition of exhibition lamp in the exhibition hall.
A photoelectric conversion device 6 is coupled between the signal judgment device 19 and the first control device 4, and the photoelectric conversion device 6 receives the judgment signal and converts the judgment signal into an electric signal for fast output; the photoelectric conversion device 6 comprises an optical coupler U1, the type of the optical coupler U1 is preferably FC-CLC in this embodiment, an anode of a diode in the optical coupler U1 is coupled to a normally closed contact KT1-1, a cathode is grounded, an emitter of a photo transistor in the optical coupler U1 is grounded, and a collector is coupled to the first control device 4, and when a signal is determined to enter the optical coupler U1, the signal is converted into an electrical signal to be output quickly.
A signal amplification device 7 is coupled between the photoelectric conversion device 6 and the first control device 4, and the signal amplification device 7 receives the converted electric signal and amplifies and outputs the electric signal; the signal amplifying device 7 includes a signal amplifier IC1, a second resistor R2 and a third resistor R3, in this embodiment, the type of the signal amplifier IC1 is preferably LM324, the non-inverting input terminal of the signal amplifier IC1 is coupled to the collector of the photo transistor in the photo coupler U1, the inverting input terminal is coupled to one end of the second resistor R2 and the third resistor R3, and the output terminal of the signal amplifier IC1 is coupled to the other end of the second resistor R2 and the third resistor R3 and the first control device 4.
The first control device 4 includes a fourth resistor R4 and a second transistor Q2, the second transistor Q2 is also preferably an NPN transistor, a base of the second transistor Q2 is coupled to an output terminal of the signal amplifier IC1 through the fourth resistor R4, an emitter of the second transistor Q2 is grounded, a collector is coupled to the first lighting device 5, the signal amplifier IC1 amplifies and outputs the converted optical signal, and then the second transistor Q2 receives and conducts the optical signal and outputs the first control signal.
The first lighting device 5 includes a plurality of first light emitting diode groups connected in series, in this embodiment, the plurality of first light emitting diodes connected in series include light emitting diodes with different colors, and the plurality of first light emitting diode groups operate and emit light after receiving the first control signal.
Referring to fig. 2 and 3, the second start device 8 is coupled to the projector start-stop device 1 and outputs a second start signal when the projector stops working, and stops outputting the second start signal when the projector starts working; the photosensitive detection device 9 is coupled to the second starting device 8 for receiving the second starting signal, detecting the light intensity in the exhibition hall and outputting a photosensitive detection signal; the second control device 10 is coupled to the photosensitive detection device 9 for receiving the photosensitive detection signal and outputting a second control signal; the second light device 11 is coupled to the second control device 10 to receive the second control signal and control the second spread light string to emit light in response to the second control signal.
The second starting device 8 comprises a normally closed contact KM-2 controlled by the relay KM, two ends of the normally closed contact KM-2 are respectively coupled to the VCC voltage and the photosensitive detection device 9, the switch S is turned off, when the relay KM is turned on, the normally closed contact KM-2 is turned on, otherwise, the switch S is turned on, and when the relay KM is turned off, the normally closed contact KM-2 is turned off.
The photosensitive detection device 9 includes a photosensitive sensing unit 14, a photosensitive comparison unit 15 and a photosensitive reference unit 16, the photosensitive sensing unit 14 is coupled to the second starting device 8 to receive the second starting signal and sense the light intensity in the exhibition hall and output a photosensitive signal, the photosensitive reference unit 16 is used for providing a photosensitive upper limit signal for the photosensitive comparison unit 15, and the photosensitive comparison unit 15 is coupled to the photosensitive sensing unit 14 to receive the photosensitive signal and output a photosensitive detection signal when the photosensitive signal is greater than the photosensitive upper limit signal.
The photosensitive sensing unit 14 comprises a photosensitive resistor RG, the type of the photosensitive resistor RG is preferably MG41-21 in the embodiment, the photosensitive comparing unit 15 comprises a fifth resistor R5 and a comparator N1, and the type of the comparator N1 is preferably LM311 in the embodiment; one end of the photosensitive resistor RG is coupled to the normally closed contact KM-2, the other end is coupled to the non-inverting input terminal of the comparator N1, the non-inverting input terminal of the comparator N1 is further grounded through a fifth resistor R5, the inverting input terminal of the comparator N1 is coupled to the photosensitive reference unit 16, and the output terminal of the comparator N1 is coupled to the second control device 10; the light resistance RG receives the second starting signal and then senses the light intensity in the exhibition hall, and converts the light signal physical quantity into a light sensitive signal, the comparator N1 receives the light sensitive signal and then compares the light sensitive signal with the light sensitive upper limit signal, and a light sensitive detection signal is output when the light sensitive signal is larger than the light sensitive upper limit signal.
The photosensitive reference unit 16 comprises a signal reference part 17 and a signal adjusting part 18, wherein the signal reference part 17 is used for providing a photosensitive upper limit signal, and the signal adjusting part 18 is used for adjusting the size of the photosensitive upper limit signal so as to adapt to exhibition hall areas with different light requirements; the signal reference part 17 comprises a sixth resistor R6 and a seventh resistor R7, the signal adjusting part 18 comprises a slide rheostat RP1, and the type of the slide rheostat RP1 in the embodiment is preferably 3296X-502; the inverting input terminal of the comparator N1 is coupled to one end of the seventh resistor R7, the other end of the seventh resistor R7 is coupled to one ends of the sixth resistor R6 and the sliding resistor RP1, the other end of the sixth resistor R6 is grounded, the other end of the sliding resistor RP1 is coupled to the VCC voltage, the connection point between the sixth resistor R6 and the seventh resistor R7 provides the photosensitive upper limit signal, and the resistance value of the connection point between the sixth resistor R6 and the seventh resistor R7 can be changed by the sliding resistor RP1 to change the magnitude of the photosensitive upper limit signal.
The second control device 10 includes an eighth resistor R8 and a third transistor Q3, the third transistor Q3 is also preferably an NPN transistor, a base of the third transistor Q3 is coupled to the output terminal of the comparator N1 through the eighth resistor R8, an emitter of the third transistor Q3 is grounded, a collector of the third transistor Q3 is coupled to the second lighting device 11, and the third transistor Q3 is turned on and outputs a second control signal after receiving the photosensitive detection signal.
A signal filtering device 12 is coupled between the second control device 10 and the second light device 11, a signal delay device 13 is coupled between the signal filtering device 12 and the second light device 11, the signal filtering device 12 receives and filters the second control signal to remove an interference signal in the second control signal, and the signal delay device 13 receives and delays the filtered second control signal for output.
The signal filtering device 12 includes a ninth resistor R9 and a first capacitor C1, one end of the ninth resistor R9 and one end of the first capacitor C1 are coupled to the collector of the third transistor Q3, the other end of the first capacitor C1 is grounded, and the other end of the ninth resistor R9 is coupled to the signal delay device 13; the signal delay device 13 comprises a delay relay KT2 and a normally closed contact KT2-1 controlled by the delay relay KT2, in the embodiment, the model of the delay relay KT2 is preferably JSZ3F, two ends of the delay relay KT2 are respectively coupled to VCC voltage and the other end of a ninth resistor R9, and two ends of the normally closed contact KT2-1 are coupled to the second lighting device 11; the certain time of predetermineeing in the time delay relay KT2, second control signal transmits to time delay relay KT2 after the filtering wave to after the time of predetermineeing, time delay relay KT2 switches on, and normally closed contact KT2-1 is closed and output second control signal, and then the light intensity in the exhibition hall is lower, needs promote.
The second lighting device 11 includes a VDD power supply and a plurality of second light emitting diode sets connected in series, one end of the normally closed contact KT2-1 is coupled to the positive electrode of the VDD power supply, the other end of the normally closed contact KT2-1 is coupled to the negative electrode of the VDD power supply, after the normally closed contact KT2-1 is closed, the circuits of the plurality of second light emitting diode sets connected in series are turned on, and the VDD power supply supplies power to make the plurality of second light emitting diode sets connected in series emit light.
The implementation principle of the embodiment is as follows:
after the switch S is disconnected, the projector stops working, the relay KM is conducted, the normally closed contact KM-1 is closed and outputs a first starting signal, the first triode Q1 is conducted and outputs a switching signal, the delay relay KT1 is conducted after continuously receiving the switching signal in a preset state, the normally closed contact KT1-1 is closed and outputs a judgment signal, the judgment signal is converted by the optical coupler U1 and outputs an electric signal, the electric signal is amplified by the signal amplifier IC1 and then output, the second triode Q2 is conducted by the amplified electric signal and outputs a first control signal, and the first light-emitting diode group emits light; the normally closed contact KM-2 is closed and outputs a second starting signal, the photoresistor RG receives the second starting signal, senses the light intensity in the exhibition hall and outputs a photosensitive signal, the comparator N1 compares the photosensitive signal with the photosensitive upper limit signal after receiving the photosensitive signal and outputs a photosensitive detection signal when the photosensitive signal is greater than the photosensitive upper limit signal, the third triode Q3 is conducted and outputs a second control signal, the delay relay KT2 is conducted after continuously receiving the second control signal in a preset state, the normally closed contact KT2-1 is closed, a VDD power supply supplies power, and the second light emitting diode group emits light;
on the contrary, when the switch S is closed and the projector starts to work, the first led set and the second led set stop emitting light.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides a culture exhibition hall light controlling means which characterized in that: the method comprises the following steps:
the projector starting and stopping device (1) is used for controlling the starting and stopping of the projector;
the first starting device (2) is coupled with the projector starting and stopping device (1), outputs a first starting signal when the projector stops working, and stops outputting the first starting signal when the projector starts working;
the switching device (3) is coupled to the first starting device (2) to receive a first starting signal and output a switching signal;
the signal judging device (19) is coupled with the switching device (3) to receive the switching signal and output a judging signal when the switching signal is continuously received;
a first control device (4) coupled to the signal determination device (19) for receiving the determination signal and outputting a first control signal;
and the first light device (5) is coupled to the first control device (4) to receive the first control signal and responds to the first control signal to control the first spread lamp string to emit light.
2. The cultural exhibition hall light control device of claim 1, wherein: a photoelectric conversion device (6) is coupled between the signal judgment device (19) and the first control device (4), and the photoelectric conversion device (6) receives the judgment signal and converts the judgment signal into an electric signal for quick output.
3. The cultural exhibition hall light control device of claim 2, wherein: a signal amplification device (7) is coupled between the photoelectric conversion device (6) and the first control device (4), and the signal amplification device (7) receives the converted electric signal and amplifies and outputs the electric signal.
4. The cultural exhibition hall light control device of claim 1, wherein: further comprising:
the second starting device (8) is coupled with the projector starting and stopping device (1), outputs a second starting signal when the projector stops working, and stops outputting the second starting signal when the projector starts working;
the photosensitive detection device (9) is coupled to the second starting device (8) to receive the second starting signal, detect the light intensity in the exhibition hall and output a photosensitive detection signal;
a second control device (10) coupled to the photosensitive detection device (9) for receiving the photosensitive detection signal and outputting a second control signal;
and the second light device (11) is coupled to the second control device (10) to receive the second control signal and responds to the second control signal to control the second spread lamp string to emit light.
5. Cultural exhibition hall light control device of claim 4, characterized in that: and a signal filtering device (12) is coupled between the second control device (10) and the second light device (11), and the signal filtering device (12) receives and filters the second control signal to remove an interference signal in the second control signal.
6. Cultural exhibition hall light control device of claim 5, characterized in that: a signal delay device (13) is coupled between the signal filtering device (12) and the second light device (11), and the signal delay device (13) receives the filtered second control signal and performs delay output.
7. Cultural exhibition hall light control device of claim 4, characterized in that: photosensitive detection device (9) includes photosensitive induction element (14), photosensitive comparison unit (15) and photosensitive reference cell (16), photosensitive induction element (14) coupling is in second starting drive (8) is in order to receive the second start signal and to respond to the light intensity in the exhibition hall and output photosensitive signal, photosensitive reference cell (16) are used for photosensitive comparison unit (15) provide photosensitive upper limit signal, photosensitive comparison unit (15) coupling is in photosensitive induction element (14) is in order to receive photosensitive signal and output photosensitive detection signal when photosensitive signal is greater than photosensitive upper limit signal.
8. The cultural exhibition hall light control device of claim 7, wherein: the photosensitive reference unit (16) comprises a signal reference part (17) and a signal adjusting part (18), wherein the signal reference part (17) is used for providing a photosensitive upper limit signal, and the signal adjusting part (18) is used for adjusting the size of the photosensitive upper limit signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948209.5U CN210807756U (en) | 2019-11-12 | 2019-11-12 | Light control device for cultural exhibition hall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948209.5U CN210807756U (en) | 2019-11-12 | 2019-11-12 | Light control device for cultural exhibition hall |
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| Publication Number | Publication Date |
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| CN210807756U true CN210807756U (en) | 2020-06-19 |
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| CN201921948209.5U Active CN210807756U (en) | 2019-11-12 | 2019-11-12 | Light control device for cultural exhibition hall |
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| CN (1) | CN210807756U (en) |
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2019
- 2019-11-12 CN CN201921948209.5U patent/CN210807756U/en active Active
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