An aerosol detection device
By designing an aerosol detection device with multiple rotating connections and an automatically replaced filter element, the problems of inflated detection results, impurities affect detection effect and cumbersome operation and maintenance in the prior art are solved, and high-precision aerosol concentration detection and convenient operation process are achieved.
Patent Information
- Application Number
- CN202411696825.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2044-11-26
AI Technical Summary
The existing aerosol detection devices have problems such as inflated detection results, impurities affect detection effects, cumbersome operation and maintenance, and poor detection effects.
An aerosol detection device is designed, including a plurality of rotatably connected filter cartridges and an automatically replaced filter cartridge. The ejection and replacement of the filter cartridge is achieved through the cooperation of the filter cartridge and the base substrate, and a monitoring assembly is equipped with a constant pressure to output gas.
Through convenient filter element replacement and constant voltage output design, the device improves the accuracy and operational convenience of aerosol concentration detection, and improves the operating efficiency of the equipment.
Smart Images

Figure CN119178854B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of aerosol detection, and in particular to an aerosol detection device. Background Art
[0002] Aerosol is a gaseous dispersion system composed of solid or liquid particles suspended in a gas medium. A rock salt aerosol therapy device is used to continuously release dry salt aerosol with a particle size of less than 5um into the air. This fine dry salt aerosol can penetrate into various parts of the respiratory tract as people breathe, enhance the respiratory tract's own defense mechanism, and effectively treat respiratory diseases. Referring to the Chinese patent application number "202322671275.5" for "an aerosol concentration detection device", the patent points out that the flow rate of aerosol gas is too fast, resulting in inflated test results; impurities attached to the gas affect the test results; but the device still has the problems of cumbersome operation and maintenance and poor detection effect. In response to this, we proposed an aerosol detection device to solve the above problems. Summary of the Invention
[0003] In view of the deficiencies of the prior art, the present invention provides an aerosol detection device that solves the problems raised in the above background technology.
[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an aerosol detection device includes a body, a detection module is fixed inside the body, and is used to detect the aerosol concentration in the gas;
[0005] An air intake pipe is fixed on the top surface of the body. A filter cartridge is provided between the air intake pipe and the detection module. A filter element is provided inside the filter cartridge to filter impurities in the gas.
[0006] There are multiple filter cartridges that are rotatably connected to the inside of the machine body. They are used to rotate inside the machine body during operation to replace the used filter element inside the filter cartridge.
[0007] A bottom sealing ring is fixed at the bottom of the filter cartridge, and a bottom base plate is connected to the inside of the filter cartridge for sliding up and down. An upper sealing cover is provided above the filter cartridge, and multiple connecting rods are fixed between the upper sealing cover and the bottom base plate. When the filter cartridge is rotated and replaced, the filter element, the connecting rod and the upper sealing cover can be driven upward by moving the bottom base plate upward. A baffle rod is fixed inside the machine body and a card plate is installed at the end of the baffle rod. The baffle rod is used to separate the filter element from the bottom base plate, and the card plate is used to lock the bottom base plate. A feed rack is fixed on the outside of the machine body, and a feeding assembly is provided inside the feed rack. The feeding assembly is used to automatically fill the filter element.
[0008] Preferably, an arc-shaped slot is provided on the top surface of the base substrate, which is adapted to the card plate. A support plate is installed at the end of the card plate for inserting into the arc-shaped slot when the base substrate is lifted and rotated, until the filter element contacts and separates from the base substrate. The card plate is used to insert into the arc-shaped slot to prevent the base substrate from falling, thereby ensuring the subsequent filling of the filter element.
[0009] Preferably, a servo motor is fixed inside the machine body, the output end of the servo motor is connected to a drive shaft through a coupling, a plurality of fixing rods are fixed on the outside of the drive shaft, and a plurality of filter cartridges are respectively fixed to the ends of the corresponding fixing rods.
[0010] Preferably, a sealing plate is fixed on the top surface of the body, the air intake pipe is fixed inside the sealing plate, a bellows is fixed at the end of the air intake pipe, an air intake hole adapted to the bellows is opened at the center position inside the upper sealing cover, and a sealing sheet is fixed at the end of the bellows.
[0011] Preferably, a pressure plate is fixedly installed inside the bellows.
[0012] Preferably, a hydraulic cylinder is fixed inside the machine body, and the hydraulic cylinder is used to drive the corresponding bottom plate to move upward to push out the filter element inside the filter cartridge.
[0013] Preferably, a connecting piece is provided between the filter cartridge and the detection module to ensure sealing. The connecting piece includes a connecting pipe, which is fixed inside the machine body. One end of the connecting pipe is connected to the detection module, and the other end of the connecting pipe is slidably sleeved with an end sleeve. The end sleeve is used to be connected to the corresponding filter cartridge. A spring body is sleeved on the outside of the connecting pipe, and the spring body is used to support the end sleeve. A sealing sleeve is fixedly installed on the end of the end sleeve.
[0014] Preferably, a monitoring component is provided between the connecting pipe and the detection module for monitoring the pressure value of the conveyed gas. The monitoring component includes a buffer cylinder, which is fixed inside the machine body. A connecting pipe is connected between the buffer cylinder and the detection module. The end of the connecting pipe is connected to the buffer cylinder, and a flow control valve is fixed at the end of the connecting pipe. A pressure monitor is fixed inside the buffer cylinder, an exhaust pipe is installed inside the detection module, and a control panel is fixed on the outside of the detection module.
[0015] Preferably, a positioning rod is fixedly installed on the outer side of the baffle rod, the positioning rod is fixed inside the machine body, and a discharge rack is fixed on the outer side of the machine body.
[0016] Preferably, the feeding assembly includes a feeding belt, and two rotating shafts are installed inside the feeding rack. The feeding belt is rotatably connected to the outside of the two rotating shafts. A plurality of elastic material-pickup plates are fixed on the outside of the feeding belt, and the plurality of elastic material-pickup plates are used to push the filter element inside the feeding rack.
[0017] The present invention provides an aerosol detection device. Compared with the prior art, it has the following advantages:
[0018] (1) The aerosol detection device, through the setting of the filter cartridge, can complete the gas filtering process through the built-in filter element during operation, and can complete the ejection and replacement of the internal filter element with the rotation and replacement of the filter cartridge and the cooperation of the bottom plate. Compared with the traditional method, it is more convenient. On the one hand, it ensures the subsequent gas filtering effect and the subsequent aerosol concentration detection accuracy, and at the same time improves the operation convenience and operation efficiency of the equipment.
[0019] (2) The aerosol detection device, through the cooperation of the monitoring components, can monitor the pressure value inside the buffer cylinder through the pressure monitor when the gas enters the buffer cylinder through the connecting pipe, and adjust the gas delivery volume through the cooperation of the flow control valve to ensure constant pressure output of the gas and the detection accuracy of the detection module. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the machine body of the present invention;
[0022] Figure 3 For the present invention Figure 2 Look at the structural diagram;
[0023] Figure 4 This is a schematic cross-sectional view of the feed rack of the present invention;
[0024] Figure 5 This is a schematic diagram of the filter cartridge structure of the present invention;
[0025] Figure 6 For the present invention Figure 5 Side view;
[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the filter cartridge and the air intake pipe of the present invention;
[0027] Figure 8 For the present invention Figure 7 A in the middle is an enlarged structural diagram;
[0028] Figure 9 It is a schematic diagram of the cross-sectional structure of the buffer cylinder of the present invention.
[0029] In the figure: 1. Machine body; 101. Hydraulic cylinder; 2. Closing plate; 3. Inlet pipe; 301. Bellows; 3011. Sealing plate; 3012. Pressure plate; 4. Detection module; 401. Exhaust pipe; 402. Control panel; 5. Feed rack; 501. Filter element; 502. Rotating shaft; 503. Feeding belt; 504. Elastic stripping plate; 6. Discharge rack; 7. Servo motor; 8. Drive shaft; 801. Fixing rod; 9. Filter cartridge; 901, upper cover; 902, bottom sealing ring; 10, connecting pipe; 1001, flow control valve; 1002, end sleeve; 1003, sealing sleeve; 1004, spring body; 11, buffer cylinder; 1101, connecting pipe; 1102, pressure monitor; 12, bottom base plate; 1201, arc-shaped notch; 13, connecting rod; 14, stop rod; 1401, positioning rod; 15, clamping plate; 16, support plate. DETAILED DESCRIPTION
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0031] See also Figures 1-9 The present invention provides two technical solutions, specifically including the following embodiments:
[0032] Example 1:
[0033] An aerosol detection device, comprising a body 1, a reference Figures 1-9 A detection module 4 is fixed inside the body 1 for detecting the aerosol concentration in the gas. The aerosol concentration is detected by delivering the gas to be detected into the body 1. The detection module 4 is an existing device and will not be described in detail here.
[0034] In the embodiment of the present invention, an air inlet pipe 3 is further fixed to the top surface of the body 1. The air inlet pipe 3 is used to transport gas into the interior of the body 1. A filter cartridge 9 is provided between the air inlet pipe 3 and the detection module 4. A filter core 501 is provided inside the filter cartridge 9. The filter core 501 is used to filter impurities in the gas. As the gas enters the interior of the filter cartridge 9, it can pass through the filter core 501 and then be discharged, thereby achieving a filtering operation for the gas.
[0035] In the embodiment of the present invention, further, there are multiple filter cartridges 9 and they are rotatably connected to the inside of the machine body 1. When the filter cartridge 9 is used, it rotates inside the machine body 1 to replace the used filter element 501 inside the filter cartridge 9. When the filter cartridge 9 needs to replace the filter element 501 inside it after a cycle of use, the filter cartridge 9 can be rotated to replace the subsequent filter cartridge 9, thereby ensuring the gas filtering effect and improving the convenience of operation.
[0036] In the embodiment of the present invention, specifically, refer to Figure 5-Figure 9 , a bottom sealing ring 902 is fixed to the bottom of the filter cartridge 9, and a bottom base plate 12 is slidably connected to the inside of the filter cartridge 9 up and down. An upper sealing cover 901 is provided above the filter cartridge 9, and a hydraulic cylinder 101 is fixed inside the body 1. The hydraulic cylinder 101 is used to drive the corresponding bottom base plate 12 to move up and push out the filter element 501 inside the filter cartridge 9. A plurality of connecting rods 13 are fixed between the upper sealing cover 901 and the bottom base plate 12. When the filter cartridge 9 is rotated and replaced, the filter element 501, the connecting rod 13 and the upper sealing cover 901 can be moved up by moving the bottom base plate 12 upward. A blocking rod 14 is fixed inside the body 1 and a card plate 15 is installed at the end of the blocking rod 14. The blocking rod 14 is used to separate the filter element 501 from the bottom base plate 12, and the card plate 15 is used to lock the bottom base plate 12. A feeding rack 5 is fixed on the outside of the body 1, and a feeding assembly is provided inside the feeding rack 5. The feeding assembly is used to automatically fill the filter element 501. Figure 5 , the filter cartridge 9 below the air inlet pipe 3 is located at the working station, and the other filter cartridges 9 are in the ejected state and are located at the replacement station. When the filter cartridge 9 needs to be replaced, as the filter cartridge 9 located at the working station rotates counterclockwise to the adjacent replacement station, the hydraulic cylinder 101 operates to eject the bottom plate 12 upward, and the filter cartridge 9 filled in the replacement station can be rotated to the working station to complete the automatic replacement. When the filter cartridge 9 rotates, the piston end of the hydraulic cylinder 101 can be retracted in time to avoid affecting the rotation of the filter cartridge 9;
[0037] In the embodiment of the present invention, specifically, an arc-shaped notch 1201 is formed on the top surface of the bottom substrate 12, and the arc-shaped notch 1201 is adapted to the clamping plate 15. A support plate 16 is installed at the end of the clamping plate 15, which is used to be inserted into the arc-shaped notch 1201 when the bottom substrate 12 is lifted and rotated, until the filter element 501 contacts the bottom substrate 12 and remains stationary until it is completely separated from the bottom substrate 12. The clamping plate 15 is used to be inserted into the arc-shaped notch 1201 to prevent the bottom substrate 12 from falling, thereby ensuring the subsequent filling of the filter element 501;
[0038] In the embodiment of the present invention, specifically, when the filter cartridge 9 drives the ejected bottom base plate 12 to rotate, the support plate 16 can be inserted into the arc-shaped notch 1201 provided in the bottom base plate 12, so that the filter element 501 contacts the blocking rod 14 and is blocked. At this time, the filter cartridge 9 drives the ejected bottom base plate 12 to continue rotating and disengage from the filter element 501 until the clamping plate 15 enters the arc-shaped notch 1201, thereby preventing the ejected bottom base plate 12 from moving downward.
[0039] In the embodiment of the present invention, specifically, a servo motor 7 is fixed inside the body 1, and the output end of the servo motor 7 is connected to the drive shaft 8 through a coupling. A plurality of fixing rods 801 are fixed to the outside of the drive shaft 8, and a plurality of filter cartridges 9 are respectively fixed to the ends of the corresponding fixing rods 801. When the servo motor 7 is running, the plurality of filter cartridges 9 can be driven to operate through the cooperation of the drive shaft 8 and the fixing rods 801.
[0040] In the embodiment of the present invention, further, a sealing plate 2 is fixed to the top surface of the body 1, an air inlet pipe 3 is fixed inside the sealing plate 2, a bellows 301 is fixed to the end of the air inlet pipe 3, an air inlet through hole adapted to the bellows 301 is opened at the center position inside the upper sealing cover 901, a sealing sheet 3011 is fixed to the end of the bellows 301, and when the filter cartridge 9 is rotated to the working position, the bellows 301 can fit with the upper sealing cover 901 above it to ensure gas transportation, and the top end of the upper sealing cover 901 is opened in an arc shape, which can contact the bellows 301 when replaced, so that the bellows 301 is forced to retract, thereby ensuring the fit effect with the upper sealing cover 901;
[0041] In the embodiment of the present invention, a pressure plate 3012 is fixedly installed inside the bellows 301. When gas is introduced through the air inlet pipe 3, the pressure plate 3012 is compressed, further increasing the fit between the bellows 301 and the upper cover 901, thereby ensuring sealing.
[0042] In the embodiment of the present invention, further, a connecting piece is provided between the filter cartridge 9 and the detection module 4 to ensure sealing. The connecting piece includes a connecting pipe 10, which is fixed inside the body 1, and one end of the connecting pipe 10 is connected to the detection module 4, and the other end of the connecting pipe 10 is slidably sleeved with an end sleeve 1002, and the end sleeve 1002 is used to be connected to the corresponding filter cartridge 9. A spring body 1004 is sleeved on the outside of the connecting pipe 10, and the spring body 1004 is used to support the end sleeve 1002. A sealing sleeve 1003 is fixedly installed on the end of the end sleeve 1002. When the filter cartridge 9 is rotated and replaced, as it contacts the end sleeve 1002, the end sleeve 1002 can be forced to retract, squeezing the spring body 1004 until the filter cartridge 9 reaches the working position. At this time, the end sleeve 1002 can be fitted with the outer surface of the filter cartridge 9 through the cooperation of the spring body 1004. The outer surface of the filter cartridge 9 is provided with a through hole connected to the end sleeve 1002 to ensure gas transportation.
[0043] A positioning rod 1401 is fixedly installed on the outside of the blocking rod 14, and the positioning rod 1401 is fixed inside the body 1. A discharge rack 6 is fixed on the outside of the body 1. The discharge rack 6 is used to discharge the used filter element 501. When the used filter element 501 contacts the blocking rod 14, as the bottom substrate 12 slowly separates from it, the bottom of the filter element can be supported by the support plate 16, and the installation position of the support plate 16 is located on the inner side of the bottom of the filter element 501. When the filter element 501 is separated from the bottom substrate 12, it can flip outward and fall to the discharge rack 6;
[0044] Furthermore, the feeding assembly includes a feeding belt 503, and two rotating shafts 502 are installed for rotation inside the feeding rack 5. The feeding belt 503 is rotatably connected to the outside of the two rotating shafts 502. A plurality of elastic material-dipping plates 504 are fixed to the outside of the feeding belt 503. The plurality of elastic material-dipping plates 504 are used to divert the filter element 501 inside the feeding rack 5. When the filter cartridge 9 rotates to the end of the feeding rack 5, the feeding belt 503 can be driven to run as the rotating shaft 502 runs, and the filter element 501 inside the feeding rack 5 can be moved to the outside through the cooperation of the elastic material-dipping plates 504. The filter cartridge 9 is pushed in the direction until the filter element 501 reaches the top of the bottom substrate 12 and contacts the connecting rod 13. A plurality of connecting rods 13 are arranged in a circle between the bottom substrate 12 and the upper cover 901, so as to ensure the position of the filter element 501. When the replacement operation is to be carried out, as the assembled filter cartridge 9 rotates toward the working station, the clamping plate 15 can be disengaged from the arc-shaped slot 1201, so that the replaced bottom substrate 12 and the filter element 501 can be moved downward by gravity until the upper cover 901 fits with the top surface of the filter cartridge 9, completing the replacement operation of the filter element 501.
[0045] Example 2: Based on Example 1, on the basis of Example 1, in the embodiment of the present invention, a monitoring component is provided between the connecting pipe 10 and the detection module 4 for monitoring the pressure value of the conveying gas, and the monitoring component includes a buffer cylinder 11, which is fixed inside the machine body 1, and a connecting pipe 1101 is connected between the buffer cylinder 11 and the detection module 4. The end of the connecting pipe 10 is connected to the buffer cylinder 11, and a flow control valve 1001 is fixed at the end of the connecting pipe 10. The flow control valve 1001 is an existing device, which is controlled based on the control panel 402. A pressure monitor 1102 is fixed inside the buffer cylinder 11. The detection module 4 An exhaust pipe 401 is installed inside the detection module 4, and a control panel 402 is fixed on the outside of the detection module 4. The control panel 402 is based on the existing PLC control module. When the gas passes through the connecting pipe 10, it can enter the buffer cylinder 11, and then be transported to the detection module 4 by the connecting pipe 1101 for detection. The pressure value inside the buffer cylinder 11 can be monitored by the pressure monitor 1102, and the gas delivery volume can be adjusted by cooperating with the flow control valve 1001 to ensure constant pressure output of the gas and the detection accuracy of the detection module 4. The pressure monitor 1102 is an existing device and is controlled based on the control panel 402.
[0046] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0047] The above is a detailed description of an embodiment of the present invention. However, the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.
Claims
1. An aerosol detection device, characterized in that: It comprises a body (1), wherein a detection module (4) is fixed inside the body (1) and is used to detect the aerosol concentration in the gas; An air intake pipe (3) is fixed on the top surface of the body (1), a filter cartridge (9) is provided between the air intake pipe (3) and the detection module (4), and a filter core (501) is provided inside the filter cartridge (9), and the filter core (501) is used to filter impurities in the gas; There are a plurality of filter cartridges (9) which are rotatably connected to the inside of the machine body (1) and are used to rotate inside the machine body (1) during operation to replace the used filter element (501) inside the filter cartridge (9); A bottom sealing ring (902) is fixed at the bottom of the filter cartridge (9); a bottom base plate (12) is slidably connected to the inside of the filter cartridge (9) in an upward and downward manner; an upper cover (901) is provided above the filter cartridge (9); a plurality of connecting rods (13) are fixed between the upper cover (901) and the bottom base plate (12); when the filter cartridge (9) is rotated and replaced, the filter element (501), the connecting rods (13) and the upper cover (901) can be driven upward by the bottom base plate (12); a blocking rod (14) is fixed inside the machine body (1) and a clamping plate (15) is installed at the end of the blocking rod (14); the blocking rod (14) is used to separate the filter element (501) from the bottom base plate (12); the clamping plate (15) is used to lock the bottom base plate (12); a feeding rack (5) is fixed outside the machine body (1); a feeding assembly is provided inside the feeding rack (5); the feeding assembly is used to automatically fill the filter element (501); The top surface of the bottom substrate (12) is provided with an arc-shaped notch (1201), which is matched with the clamping plate (15). A support plate (16) is installed at the end of the clamping plate (15) and is used to be inserted into the arc-shaped notch (1201) when the bottom substrate (12) is lifted and rotated, until the filter element (501) and the bottom substrate (12) are in contact and separated. The clamping plate (15) is used to be inserted into the arc-shaped notch (1201) to prevent the bottom substrate (12) from falling, thereby ensuring the subsequent filling of the filter element (501).
2. An aerosol detection device according to claim 1, characterized in that: A servo motor (7) is fixed inside the machine body (1); the output end of the servo motor (7) is connected to a drive shaft (8) via a coupling; a plurality of fixing rods (801) are fixed to the outside of the drive shaft (8); and a plurality of filter cartridges (9) are respectively fixed to the ends of corresponding fixing rods (801).
3. An aerosol detection device according to claim 1, characterized in that: A sealing plate (2) is fixed on the top surface of the machine body (1), the air intake pipe (3) is fixed inside the sealing plate (2), a bellows (301) is fixed at the end of the air intake pipe (3), an air intake through hole matching the bellows (301) is opened at the center position inside the upper sealing cover (901), and a sealing sheet (3011) is fixed at the end of the bellows (301).
4. An aerosol detection device according to claim 3, characterized in that: A pressure sheet (3012) is fixedly installed inside the bellows (301).
5. An aerosol detection device according to claim 1, characterized in that: A hydraulic cylinder (101) is fixed inside the machine body (1), and the hydraulic cylinder (101) is used to drive the corresponding bottom plate (12) to move upwards, thereby ejecting the filter element (501) inside the filter cartridge (9).
6. An aerosol detection device according to claim 1, characterized in that: A connecting piece is provided between the filter cartridge (9) and the detection module (4) for ensuring sealing, the connecting piece comprising a connecting pipe (10), the connecting pipe (10) being fixed inside the machine body (1), one end of the connecting pipe (10) being connected to the detection module (4), the other end of the connecting pipe (10) being slidably sleeved with an end sleeve (1002), the end sleeve (1002) being used to be connected to the corresponding filter cartridge (9), the outer side of the connecting pipe (10) being sleeved with a spring body (1004), the spring body (1004) being used to support the end sleeve (1002), and a sealing sleeve (1003) being fixedly mounted at the end of the end sleeve (1002).
7. An aerosol detection device according to claim 6, characterized in that: A monitoring component is provided between the connecting pipe (10) and the detection module (4) for monitoring the pressure value of the conveyed gas, the monitoring component comprising a buffer cylinder (11), the buffer cylinder (11) being fixed inside the machine body (1), a connecting pipe (1101) being connected between the buffer cylinder (11) and the detection module (4), an end of the connecting pipe (10) being connected to the buffer cylinder (11), a flow control valve (1001) being fixed to the end of the connecting pipe (10), a pressure monitor (1102) being fixed inside the buffer cylinder (11), an exhaust pipe (401) being installed inside the detection module (4), and a control panel (402) being fixed outside the detection module (4).
8. An aerosol detection device according to claim 1, characterized in that: A positioning rod (1401) is fixedly mounted on the outer side of the blocking rod (14), the positioning rod (1401) is fixed inside the machine body (1), and a material discharge rack (6) is fixed on the outer side of the machine body (1).
9. An aerosol detection device according to claim 1, characterized in that: The feeding assembly comprises a feeding belt (503), two rotating shafts (502) are rotatably installed inside the feeding rack (5), the feeding belt (503) is rotatably connected to the outside of the two rotating shafts (502), and a plurality of elastic material shifting plates (504) are fixed to the outside of the feeding belt (503), and the plurality of elastic material shifting plates (504) are used to shift the filter element (501) inside the feeding rack (5).
Citation Information
Patent Citations
An aerosol concentration detection device
CN220961446U
Air filter
CN107261686A
Coking plant flue gas desulfurization wastewater treatment control device
CN114272697A