CN113747598B - Communication method, terminal, host and smoke collecting and exhausting machine system - Google Patents
Communication method, terminal, host and smoke collecting and exhausting machine system Download PDFInfo
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- CN113747598B CN113747598B CN202111056829.XA CN202111056829A CN113747598B CN 113747598 B CN113747598 B CN 113747598B CN 202111056829 A CN202111056829 A CN 202111056829A CN 113747598 B CN113747598 B CN 113747598B
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- 238000004891 communication Methods 0.000 title claims abstract description 295
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000000779 smoke Substances 0.000 title claims abstract description 27
- 238000004590 computer program Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 3
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The application relates to a communication method, a terminal, a host and a smoke collecting and exhausting machine system. The communication method is applied to a terminal in a smoke collecting and exhausting machine system, and comprises the following steps: when uplink data is required to be sent to a host through a first communication channel, judging whether the channel state of the first communication channel is an unavailable state, wherein the first communication channel is a communication channel currently used by the terminal; if the channel state of the first communication channel is a non-available state, determining a second communication channel according to a communication channel occupation table, wherein the communication channel occupation table comprises the corresponding relation between the communication channel and a terminal; and sending uplink data to the host through the second communication channel. The application can prevent the same-frequency interference.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication method, a terminal, a host, and a smoke collecting and exhausting system.
Background
At present, a host and a terminal of a smoke collecting and exhausting machine system generally adopt wireless communication modes such as LoRa, zigbee and the like for communication. When the host and the terminal communicate by using the wireless communication method, a certain communication frequency point is selected from the frequency bands corresponding to the wireless communication method as a network channel, and communication is performed under the network channel. For example, the frequency band corresponding to LoRa is 470 MHz-510 MHz, and the host and the terminal need to select a certain frequency point as a network channel within the range of 470 MHz-510 MHz.
However, in the practical application scenario, the frequency band of the wireless communication system adopted by the wireless ammeter system, the wireless water meter system, the interphone and the like in the building is the same as the frequency band of the wireless communication system adopted by the smoke collecting and exhausting machine system, and the same-frequency interference may be generated on the communication of the smoke collecting and exhausting machine system.
Disclosure of Invention
In view of the above, it is necessary to provide a communication method, a terminal, a host, and a smoke collecting and exhausting system.
In a first aspect, a communication method is provided, where the communication method is applied to a terminal in a smoke collecting and exhausting system, and the method includes:
when uplink data is required to be sent to a host through a first communication channel, judging whether the channel state of the first communication channel is an unavailable state, wherein the first communication channel is a communication channel currently used by the terminal;
if the channel state of the first communication channel is a non-available state, determining a second communication channel according to a communication channel occupation table, wherein the communication channel occupation table comprises the corresponding relation between the communication channel and a terminal;
and sending uplink data to the host through the second communication channel.
As an alternative embodiment, the determining the second communication channel according to the communication channel occupancy table includes:
inquiring the number of terminals corresponding to other communication channels except the first communication channel in the communication channel occupation table;
among the other communication channels, the communication channel having the largest number of terminals is determined as the second communication channel.
As an optional implementation manner, the determining whether the channel state of the first communication channel is an unavailable state includes:
transmitting uplink data to the host through the first communication channel;
if the downlink data sent by the host is not received within the preset time length, sending uplink data to the host again through the first communication channel;
and when the retransmission times reach a preset retransmission times threshold value, judging that the channel state of the first communication channel is in a non-available state.
As an alternative embodiment, the method further comprises:
and if the channel state of the first communication channel is an available state, sending uplink data to the host through the first communication channel.
In a second aspect, a communication method is provided, the communication method being applied to a host in a smoke collecting and exhausting system, the method comprising:
polling each communication channel according to a preset polling interval;
if uplink data sent by a first terminal is received through a first communication channel, recording a corresponding relation between the first communication channel and the first terminal, and updating a communication channel occupation table according to the corresponding relation, wherein the first communication channel is any one of the communication channels, and the first terminal is any one of the terminals in the smoke collecting and exhausting machine system;
and after all the communication channels are polled, the updated communication channel occupation table is sent to all the terminals.
As an optional implementation manner, the updating the communication channel occupancy table according to the correspondence relationship includes:
inquiring a current communication channel corresponding to the first terminal in the communication channel occupation table;
if the current communication channel is not queried, adding the corresponding relation between the first terminal and the first communication channel in the communication channel occupation table;
and if the current communication channel is different from the first communication channel, modifying the current communication channel corresponding to the first terminal in the communication channel occupation table into the first communication channel.
As an alternative embodiment, the method further comprises:
after polling each communication channel, transmitting downlink data to the first terminal through the first communication channel.
In a third aspect, there is provided a terminal comprising: a memory and a processor, the memory having stored thereon a computer program executable on the processor, the processor implementing the steps of the method of any of the first aspects when the computer program is executed.
In a fourth aspect, there is provided a host comprising: a memory and a processor, the memory having stored thereon a computer program executable on the processor, the processor implementing the steps of the method of any of the second aspects when the computer program is executed.
In a fifth aspect, there is provided a fume extractor system comprising: the terminal according to the third aspect and the host according to the fourth aspect.
The application provides a communication method, a terminal, a host and a smoke collecting and exhausting machine system. When the terminal needs to send uplink data to the host through the first communication channel, judging whether the channel state of the first communication channel is in a non-available state. Wherein the first communication channel is a communication channel currently used by the terminal. If the channel state of the first communication channel is the unavailable state, the terminal determines a second communication channel according to the communication channel occupation table, and sends uplink data to the host through the second communication channel. The communication channel occupation table comprises the corresponding relation between the communication channels and the terminal. In this way, the terminal can switch the communication channel when being interfered by the same frequency, thereby preventing the same frequency interference.
Drawings
Fig. 1 is a schematic structural diagram of a smoke collecting and exhausting system according to an embodiment of the present application;
FIG. 2 is a flow chart of a communication method according to an embodiment of the present application;
FIG. 3 is a flow chart of a communication method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a host according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The embodiment of the application provides a communication method which can be applied to a smoke collecting and exhausting machine system. As shown in fig. 1, the fume extractor system includes a main unit 110 and a terminal unit 120. Wherein, host computer 110 sets up on the top of public flue, and terminal 120 sets up respectively in the each floor of public flue.
A detailed description will be given below of a communication method according to an embodiment of the present application, which is applied to a terminal in a smoke exhaust ventilator system. As shown in fig. 2, the specific steps are as follows:
in step 201, when uplink data needs to be sent to the host through the first communication channel, it is determined whether the channel state of the first communication channel is an unavailable state. Wherein the first communication channel is a communication channel currently used by the terminal.
In implementation, when the range hood corresponding to the terminal performs operations such as starting, gear shifting, etc., the terminal needs to send uplink data to the host through the currently used communication channel (i.e., the first communication channel). At this time, the terminal may determine whether the channel state of the first communication channel is an unavailable state. The first communication channel may be a default communication channel of the terminal, or may be a communication channel determined by performing a communication channel switching last time.
Optionally, the processing procedure of the terminal for determining whether the channel state of the first communication channel is the unavailable state is as follows:
step one, uplink data is sent to a host through a first communication channel.
In implementations, the terminal may send upstream data to the host over the first communication channel.
And step two, if the downlink data sent by the host is not received within the preset duration, the uplink data is sent to the host again through the first communication channel.
In an implementation, after the terminal sends uplink data to the host through the first communication channel, the terminal may wait for downlink data sent by the host within a preset duration. If the downlink data sent by the host is not received within the preset duration, the terminal can send the uplink data to the host again through the first communication channel. The preset time may be set by a technician according to experience, and the embodiment of the present application is not limited. Optionally, in the present application, the host transmits downlink data to the terminal after polling the complete communication channel, and the preset duration may be set according to the number of communication channels and the waiting duration of a single communication channel. For example, the preset duration may be set to n×50ms, where n is the number of communication channels and 50ms is the single communication channel waiting duration.
And step three, when the retransmission times reach a preset retransmission times threshold value, judging that the channel state of the first communication channel is in a non-available state.
In implementation, when the number of retransmissions reaches a preset threshold number of retransmissions, it indicates that the terminal cannot communicate with the host through the first communication channel, and the terminal may determine that the channel state of the first communication channel is a non-available state. The threshold of the retransmission times can be set by a technician according to practical situations, and the application is not limited thereto. For example, the retransmission number threshold may be set to 3 times.
Step 202, if the channel state of the first communication channel is the unavailable state, determining a second communication channel according to the communication channel occupancy table. The communication channel occupation table comprises the corresponding relation between the communication channels and the terminal.
In an implementation, if the channel state of the first communication channel is an unavailable state, it is indicated that the terminal cannot communicate with the host through the first communication channel. At this time, the terminal may determine the second communication channel according to the communication channel occupancy table. The communication channel occupation table comprises the corresponding relation between the communication channels and the terminal, and the communication channel occupation table is updated by the host and sent to the terminal.
Optionally, if the channel state of the first communication channel is an available state, uplink data is sent to the host through the first communication channel.
In an implementation, if the channel state of the first communication channel is an available state, it is indicated that the terminal may communicate with the host over the first communication channel. At this point, the terminal may burn upstream data to the host over the first communication channel.
Optionally, the processing procedure of the terminal for determining the second communication channel according to the communication channel occupation table is as follows:
step one, the number of terminals corresponding to other communication channels except the first communication channel is inquired in a communication channel occupation table.
In an implementation, after the terminal determines that the channel state of the first communication channel is the unavailable state, the number of terminals corresponding to other communication channels except the first communication channel may be queried in the communication channel occupation table.
And step two, determining the communication channel with the largest number of terminals as a second communication channel from other communication channels.
In practice, after the terminal in the smoke exhaust system performs communication channel switching due to channel interference of other systems, the terminal gradually concentrates on some undisturbed communication channels. Therefore, after the terminal inquires the number of the terminals corresponding to the other communication channels, the communication channel with the largest number of the terminals can be further determined as the second communication channel. Optionally, in order to prevent communication congestion caused by excessive terminals in a certain communication channel, the terminals may further rank the communication channels in order of from more to less terminals, and determine, in the ranking, the communication channel corresponding to the preset ranking position as the second communication channel.
And step 203, sending uplink data to the host through the second communication channel.
In an implementation, after determining the second communication channel, the terminal may send uplink data to the host through the second communication channel. Alternatively, the terminal may determine whether the channel state of the second communication channel is an unavailable state. If the channel state of the second communication channel is in the unavailable state, determining a third communication channel according to the communication channel occupation table, and repeating the steps until the communication channel which can be communicated between the terminal and the host is determined.
The embodiment of the application also provides a communication method which is applied to the host in the smoke collecting and exhausting machine system. As shown in fig. 3, the specific steps are as follows:
step 301, polling each communication channel according to a preset polling interval.
In an implementation, for each communication channel included in a frequency band corresponding to a communication mode used by the smoke collecting and exhausting system, the host may poll each communication channel according to a preset polling interval. Meanwhile, the host may wait for a preset waiting period (e.g., 10 ms) in each channel to receive uplink data transmitted to the host through the communication channel by the terminal using the communication channel.
Step 302, if uplink data sent by the first terminal is received through the first communication channel, a correspondence between the first communication channel and the first terminal is recorded, and a communication channel occupation table is updated according to the correspondence. The first communication channel is any one of the communication channels, and the first terminal is any one of the terminals in the smoke collecting and exhausting machine system.
In an implementation, if the host receives uplink data sent by the first terminal through the first communication channel, the host may record a correspondence between the first communication channel and the first terminal, and update the communication channel occupation table according to the correspondence. The first communication channel is any one of the communication channels, and the first terminal is any one of the terminals in the smoke collecting and exhausting machine system.
Optionally, the processing procedure of updating the communication channel occupation table by the host according to the corresponding relation is as follows:
step one, in a communication channel occupation table, inquiring a current communication channel corresponding to a first terminal.
In an implementation, after the host records the correspondence between the first communication channel and the first terminal, the current communication channel corresponding to the first terminal may be queried in the communication channel occupation table.
And step two, if the current communication channel is not queried, adding the corresponding relation between the first terminal and the first communication channel in the communication channel occupation table.
In an implementation, if the current communication channel is not queried, the host may add the correspondence of the first terminal and the first communication channel to the communication channel occupancy table.
And step three, if the current communication channel is different from the first communication channel, modifying the current communication channel corresponding to the first terminal in the communication channel occupation table into the first communication channel.
In practice, if the queried current communication channel is not the same as the first communication channel, it is indicated that the communication channel used by the first terminal is switched. Correspondingly, the host can modify the current communication channel corresponding to the first terminal in the communication channel occupation table into the first communication channel.
Step 303, after polling each communication channel, the updated communication channel occupation table is sent to each terminal.
In an implementation, after the host polls each communication channel, the host may further send the updated communication channel occupancy table to each terminal. In this way, the terminal can switch the communication channel using the updated communication channel occupancy table.
Optionally, after polling each communication channel, the host sends downlink data to the first terminal through the first communication channel.
In an implementation, after polling each communication channel, the host sends downlink data to the first terminal through the first communication channel according to the recorded correspondence between the first communication channel and the first terminal.
The embodiment of the application provides a communication method. When the terminal needs to send uplink data to the host through the first communication channel, judging whether the channel state of the first communication channel is in a non-available state. Wherein the first communication channel is a communication channel currently used by the terminal. If the channel state of the first communication channel is the unavailable state, the terminal determines a second communication channel according to the communication channel occupation table, and sends uplink data to the host through the second communication channel. The communication channel occupation table comprises the corresponding relation between the communication channels and the terminal. In this way, the terminal can switch the communication channel when being interfered by the same frequency, thereby preventing the same frequency interference.
The embodiment of the application also provides a host, as shown in fig. 4, which comprises: the communication system comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor realizes the steps of the communication method when executing the computer program.
The embodiment of the application also provides a terminal, as shown in fig. 5, which comprises: the communication system comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor realizes the steps of the communication method when executing the computer program.
The embodiment of the application also provides a smoke collecting and exhausting machine system, which comprises: a host computer for executing the communication method, a relay terminal for executing the communication method and a terminal for executing the communication method.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (9)
1. A communication method, wherein the communication method is applied to a terminal in a smoke collecting and exhausting system, the method comprising:
when uplink data is required to be sent to a host through a first communication channel, judging whether the channel state of the first communication channel is an unavailable state, wherein the first communication channel is a communication channel currently used by the terminal;
if the channel state of the first communication channel is in a non-usable state, determining a second communication channel according to a communication channel occupation table, wherein the communication channel occupation table comprises the corresponding relation between the communication channels and the terminal, the communication channel occupation table is that the host polls each communication channel according to a preset polling interval, after any communication channel receives uplink data sent by any terminal, the corresponding relation between the communication channel and the terminal is recorded, the communication channel occupation table is updated according to the corresponding relation, and after each communication channel is polled, the updated communication channel occupation table is sent to each terminal;
sending uplink data to the host through the second communication channel;
the determining the second communication channel according to the communication channel occupation table comprises the following steps: inquiring the number of terminals corresponding to other communication channels except the first communication channel in the communication channel occupation table; among the other communication channels, the communication channel having the largest number of terminals is determined as the second communication channel.
2. The method of claim 1, wherein said determining whether the channel state of the first communication channel is an unavailable state comprises:
transmitting uplink data to the host through the first communication channel;
if the downlink data sent by the host is not received within the preset time length, sending uplink data to the host again through the first communication channel;
and when the retransmission times reach a preset retransmission times threshold value, judging that the channel state of the first communication channel is in a non-available state.
3. The method according to claim 1, wherein the method further comprises:
and if the channel state of the first communication channel is an available state, sending uplink data to the host through the first communication channel.
4. A communication method, wherein the communication method is applied to a host in a smoke collecting and exhausting machine system, the method comprising:
polling each communication channel according to a preset polling interval;
if uplink data sent by a first terminal is received through a first communication channel, recording a corresponding relation between the first communication channel and the first terminal, and updating a communication channel occupation table according to the corresponding relation, wherein the first communication channel is any one of the communication channels, and the first terminal is any one of the terminals in the smoke collecting and exhausting machine system;
after each communication channel is polled, the updated communication channel occupation table is sent to each terminal, and the communication channel occupation table is used for each terminal to send uplink data to the host through the communication channel which is currently used, and when the communication channel which is currently used is judged to be in a non-available state, the communication channels which are not currently used and have the largest number of the terminal except the communication channel which is currently used are determined according to the communication channel occupation table so as to send the uplink data to the host.
5. The method of claim 4, wherein updating the communication channel occupancy table according to the correspondence comprises:
inquiring a current communication channel corresponding to the first terminal in the communication channel occupation table;
if the current communication channel is not queried, adding the corresponding relation between the first terminal and the first communication channel in the communication channel occupation table;
and if the current communication channel is different from the first communication channel, modifying the current communication channel corresponding to the first terminal in the communication channel occupation table into the first communication channel.
6. The method according to claim 4, wherein the method further comprises:
after polling each communication channel, transmitting downlink data to the first terminal through the first communication channel.
7. A terminal, the terminal comprising: a memory and a processor, the memory having stored thereon a computer program executable on the processor, the processor implementing the steps of the method of any of claims 1 to 3 when the computer program is executed.
8. A host, the host comprising: a memory and a processor, the memory having stored thereon a computer program executable on the processor, the processor implementing the steps of the method of any of claims 4 to 6 when the computer program is executed.
9. A smoke collecting and exhausting system, characterized in that the smoke collecting and exhausting system comprises: a terminal according to claim 7 and a host according to claim 8.
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| CN202111056829.XA CN113747598B (en) | 2021-09-09 | 2021-09-09 | Communication method, terminal, host and smoke collecting and exhausting machine system |
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| CN202111056829.XA CN113747598B (en) | 2021-09-09 | 2021-09-09 | Communication method, terminal, host and smoke collecting and exhausting machine system |
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| CN113747598B true CN113747598B (en) | 2023-11-21 |
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| CN113339859A (en) * | 2021-06-01 | 2021-09-03 | 华帝股份有限公司 | Communication method, host, relay terminal, terminal and smoke exhaust collection and exhaust machine system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101603944B1 (en) * | 2011-11-08 | 2016-03-16 | 엘지전자 주식회사 | Method for acquiring information on occupied channel of device which subscribes to information service in television white space band |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994583A (en) * | 2015-06-17 | 2015-10-21 | 重庆邮电大学 | Multi-channel MAC protocol method based on cluster mechanism in vehicular Ad hoc network |
| CN105898882A (en) * | 2016-03-29 | 2016-08-24 | 珠海格力电器股份有限公司 | Data transmission method, sending terminal, receiving terminal and data transmission system |
| CN110913500A (en) * | 2019-10-25 | 2020-03-24 | 四川长虹智能制造技术有限公司 | Anti-collision control method and anti-collision control system of hot pot machine |
| CN113339859A (en) * | 2021-06-01 | 2021-09-03 | 华帝股份有限公司 | Communication method, host, relay terminal, terminal and smoke exhaust collection and exhaust machine system |
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